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Gray scale capability (e.g., halftone)

Subclass of:

345 - Computer graphics processing and selective visual display systems

345030000 - PLURAL PHYSICAL DISPLAY ELEMENT CONTROL SYSTEM (E.G., NON-CRT)

345055000 - Display elements arranged in matrix (e.g., rows and columns)

345084000 - Light-controlling display elements

345087000 - Liquid crystal display elements (LCD)

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DocumentTitleDate
20090195487LIQUID CRYSTAL DISPLAY DEVICE - A liquid crystal display device according to the present invention includes a plurality of pixels, each including first and second subpixels. When a predetermined grayscale tone is displayed continuously through four or more consecutive even number of vertical scanning periods, the first and second subpixels have different luminances in at least two of the even number of vertical scanning periods, first polarity periods that are included in the vertical scanning periods and that maintain a first polarity are as long as second polarity periods that are also included in the vertical scanning periods and that maintain a second polarity for each of the first and second subpixels, and in each of the first and second polarity periods, the difference between the average of effective voltages applied to the liquid crystal layer of the first subpixel and that of effective voltages applied to the liquid crystal layer of the second subpixel is substantially equal to zero.08-06-2009
20080259015LIQUID CRYSTAL DISPLAY ELEMENT, DRIVING METHOD OF THE SAME, AND ELECTRONIC PAPER HAVING THE SAME - A method of driving a liquid crystal display element includes a first step for initializing a liquid crystal in a pixel and displaying an initial grayscale at the pixel and a second step for displaying a desired grayscale lower than the initial grayscale by making a cumulative time difference between low grayscales lower than a reference grayscale longer than a cumulative time difference between high grayscales higher than the reference grayscale, where the cumulative time differences are a difference between a cumulative voltage application time of voltage pulses cumulatively applied to display a grayscale lower than the initial grayscale and a cumulative voltage application time of the voltage pulses cumulatively applied to display a grayscale one level lower than the grayscale lower than the initial grayscale.10-23-2008
20080259014LIQUID CRYSTAL DISPLAY DEVICE - A liquid crystal display device prevents the gray level folding in at least one of the vicinities of the highest and lowest gray levels while avoiding the complication of the data line driver circuit. The data line driver circuit generates output voltages whose number is equal to a predetermined gray level number M based on reference voltages, and selects one of the output voltages and outputs the selected one to the display section in response to an inputted image signal, thereby displaying images The applied voltage-brightness characteristic of the display section has a zero brightness change region in which the reference voltage corresponding to the highest gray level is located. The reference voltage corresponding to the next lower level to the highest level is set such that the brightness at the next lower level is lower than that at the highest level by a predetermined difference.10-23-2008
20080259012Optical display system and method, active and passive dithering using birefringence, color image superpositioning and display enhancement with phase coordinated polarization switching - A display apparatus includes a passive display, a light source, and a video signal input, in operation in response to a video signal the passive display modulates light from the light source to provide an image, and the intensity of the light source is controlled by the video signal.10-23-2008
20080259013GAMMA CORRECTION CIRCUIT - A gamma correction circuit includes: a first set of operational amplifiers each configured as a voltage follower, each of the first set of operational amplifiers including a phase compensation circuit that has a variable current source; and a second operational amplifier configured as a voltage follower, the gamma correction circuit dividing an input voltage so as to generate a plurality of divided voltages, and outputting a plurality of grayscale voltages based on the plurality of divided voltages generated, the first set of operational amplifiers generating a most significant voltage and a least significant voltage of the plurality of grayscale voltages, based on a predetermined divided voltage of the plurality of divided voltages, the second operational amplifier generating an intermediate voltage of the plurality of grayscale voltages, but not the most significant voltage nor the least significant voltage of the grayscale voltages, based on a predetermined divided voltage of the plurality of divided voltages, an output capability of each of the first set of operational amplifiers being larger than an output capability of the second set of operational amplifier, and the variable current source being allowed to change and set a current value to an arbitral value.10-23-2008
20100117943Liquid Crystal Display, Estimating Method of Ambient Light and Driving Method of Liquid Crystal Display - Provided are a liquid crystal display, a method of estimating ambient light, and a driving method of the liquid crystal display. The liquid crystal display includes a first electrode and a second electrode generating an electric field, liquid crystal molecules the orientation state of which is changed by the generated electric field, and a photodetector sensing the light passing through the liquid crystal molecules.05-13-2010
20130038516DISPLAY APPARATUS AND GAMMA VOLTAGE GENERATOR THEREOF - The invention provides a display apparatus and a gamma voltage generator. The gamma voltage generator includes a string of resistors and a voltage-regulating unit. The string of resistors is coupled between a first reference voltage and a second reference voltage for generating a plurality of gamma voltages. The voltage-regulating unit is used for sensing a voltage coupling amount of a common voltage in a display panel and shifting the first reference voltage and the second reference voltage according to the voltage coupling amount. In this way, the invention can eliminate the influence of coupling the display apparatus to the pixel voltages on the common voltage.02-14-2013
20100045582DISPLAY ELEMENT HAVING GROUPS OF INDIVIDUALLY TURNED-ON STEPS - A display element (02-25-2010
20100013751Correction of visible mura distortions in displays using filtered mura reduction and backlight control - A display that includes at least one gray level being provided to a plurality of pixels that illuminates each of the pixels with the gray level. The display applies interpolated corrective data for the pixels so as to reduce the mura effects of said display and modifies the backlight of the display.01-21-2010
20100109992ACTIVE MATRIX DISPLAY DEVICES AND DISPLAY METHODS THEREOF - An active matrix display device having pixels disposed in a matrix is provided. Each pixel is divided into sub-pixels with different areas. The display device includes an inputting portion, multi-bit memories, digital-to-analog conversion circuits, display elements, and a conversion portion. The inputting portion inputs image digital data from outside of the active matrix display device. The multi-bit memories are disposed respectively for the sub-pixels and store input digital data with at least two bits, which serves as gray level information for gray-scale displaying of the sub-pixels. The digital-to-analog conversion circuits convert the input digital data to analog data which is used for the gray-scale displaying. The display elements perform the gray-scale displaying according to the analog data. The conversion portion converts the image digital data to the input digital data according to a predetermined gamma value waiting to be achieved and an area ratio of the sub-pixels.05-06-2010
20090009455LIQUID CRYSTAL DISPLAY DEVICE, DRIVING METHOD OF THE LIQUID CRYSTAL DISPLAY DEVICE, AND ELECTRONIC DEVICE EMPLOYING THE SAME DEVICE AND THE SAME METHOD - To provide a liquid crystal display device which can improve viewing angle characteristics and a driving method of the liquid crystal display device, and an electronic device including the liquid crystal display device. In a liquid crystal display device which performs display by aligning liquid crystal molecules at a tilt or radially at a tilt, one pixel is divided into a plurality of regions (sub-pixels) and a signal applied to each sub-pixel is made different every desired period. Alternatively, a signal applied to each sub-pixel is made different with respect to an adjacent pixel. To improve viewing angle characteristics by changing transmittance of the liquid crystal molecules every desired period in addition to improving the viewing angle characteristics of a viewer by making the liquid crystal molecules slanted to increase directions of alignment.01-08-2009
20090153456Method for generating over-drive data - A method for generating over-drive data includes storing a reduced over-drive table and a predetermined weighting table, finding first and second reference values from the reduced over-drive table according to received previous current pixel values, finding first and second weighting values from the predetermined weighting table according to the received current pixel value, and generating a corresponding over-drive data according to the first and the second reference values, and the first and the second weighting values.06-18-2009
20090040158GAMMA REFERENCE VOLTAGE GENERATING DEVICE, METHOD FOR GENERATING GAMMA REFERENCE VOTLAGE, AND GRAY LEVEL VOLTAGE GENERATING DEVICE - A gamma reference voltage generating device, a method for generating gamma reference voltages, and a gray level voltage generating device are provided. The gray level voltage generating device includes a selection unit and a gray level voltage generator. The selection unit is adapted for receiving M first gamma reference voltages, and selecting N second gamma reference voltages from the M first gamma reference voltages and outputting the N second gamma reference voltages, wherein M and N are positive integers, and M>N. The gray level voltage generator is coupled to the selection unit, for generating a plurality of gray level voltages according to the N second gamma reference voltages. The gamma curve can be adaptively adjusted by using the present invention so as to improve the display quality.02-12-2009
20090243983Video signal processing circuit, display apparatus, liquid crystal display apparatus, projection type display apparatus and video signal processing method - A video signal processing circuit is disclosed. The video signal processing circuit includes a difference detection section, first calculation section, and correction amount addition section. The difference detection section detects a difference between a drive voltage for each of pixels of a matrix drive type display panel as a pixel under consideration and a drive voltage of each of pixels adjacent to the pixel under consideration from an input video signal. The first calculation section calculates a correction amount of a drive voltage for a pixel under correction that has a luminance change due to an electric field caused by a difference of the drive voltages for the two pixels detected by the difference detection section. The correction amount addition section corrects a value of the drive voltage for a pixel under correction that has the luminance change based on the correction amount calculated by the first calculation section.10-01-2009
20100097307METHOD AND SYSTEM OF REDUCING IMAGE STICKING - To reduce the image sticking, a first number of frames outputted from the multimedia signal source are successively received. The first number of frames are processed to obtain a plurality of corresponding gray-level characteristic. A predefined frame is inserted into a plurality of incoming frame with a specified ratio if the plurality gray-level characteristic is qualified to a specified predefined condition.04-22-2010
20090267881LIQUID CRYSTAL DISPLAY - A data converter divides input data into first subframe data and latter subframe data, and the latter subframe data is given to a data serial-parallel converter and serial-parallel converted. The first subframe data is given to a line memory group, and given to an overdrive operation circuit after a given delay. The latter subframe data converted into parallel data is given to a line memory group, and given to a data parallel-serial converter after a given delay, where it is parallel-serial converted, and then it becomes output data after the first subframe data outputted from the overdrive operation circuit.10-29-2009
20090267880LIQUID CRYSTAL DISPLAY DEVICE - A pixel has a first liquid crystal domain. In the first liquid crystal domain, first and second pretilt directions of liquid crystal molecules, defined by first and second alignment films, respectively, intersect with each other at substantially right angles. Also, in the first liquid crystal domain, when a signal voltage is applied to the liquid crystal layer to display the highest gray scale, liquid crystal molecules, located around the center of a plane of the liquid crystal layer and around the middle of the thickness of the liquid crystal layer, are tilted in a first direction that substantially equally divides the first and second pretilt directions into two. A driver applies a signal voltage to the liquid crystal layer of the pixel every vertical scanning period. At least while display gray scales are changing from the lowest gray scale into the highest one, the driver applies a voltage that is at least 0.96 times as high as the threshold voltage Vth of the liquid crystal layer in a vertical scanning period just before the signal voltage is applied to display the highest gray scale.10-29-2009
20090237338LIQUID CRYSTAL DISPLAY DEVICE AND DRIVING METHOD THEREOF, OVER-DRIVE CORRECTION DEVICE AND DATA PRODUCTION METHOD THEREOF AND ELECTRONIC DEVICE - A driving method for a liquid crystal display device and an over-drive correction device, which can perform proper overdrive control in various operating environments. The over-drive correction device includes a dummy liquid crystal unit embedded in the liquid crystal display device, a liquid crystal capacitive sensor to detect a capacitance (dielectric constant) of the dummy liquid crystal unit, a calculation circuit for lookup tables, an overdrive lookup table, a prediction lookup table and an overdrive circuit. The calculation circuit for lookup tables corrects data in the over-drive lookup table and the prediction lookup table according to the detection result generated from the liquid crystal capacitive sensor. The over-drive circuit performs over-drive control in the liquid crystal display device based on the newly corrected over-drive lookup table and prediction lookup table.09-24-2009
20090237337INTEGRATED CIRCUIT DEVICE, ELECTRONIC APPARATUS, AND METHOD FOR SETTING GRAY SCALE CHARACTERISTIC DATA - An electronic apparatus with an electro-optical panel having a plurality of scanning and data lines; an integrated circuit device; a first memory that stores gray scale characteristic data for the electro-optical panel; and a processing section controlling the integrated circuit device and the first memory. The integrated circuit device includes: a scanning driver; a data driver; a second memory storing gray scale data; a gray scale signal generation circuit; and a logic circuit controlling the other elements. The logic circuit retrieves, at a power-on, an initial piece of gray scale characteristic data and then determines whether the retrieved gray scale characteristic data and the given gray scale characteristic data agree or not.09-24-2009
20100013750Correction of visible mura distortions in displays using filtered mura reduction and backlight control - A display that includes at least one gray level being provided to a plurality of pixels that illuminates each of the pixels with the gray level. The display applies interpolated corrective data for the pixels so as to reduce the mura effects of said display and modifies the backlight of the display.01-21-2010
20090009457ELECTRO-OPTICAL DEVICE AND DRIVING METHOD FOR THE SAME - A grey tone display and a driving method are described. The display comprises a light influencing layer, an electrode pad located adjacent to the layer at one side of the layer in order to define a pixel in the layer, an n-channel field effect transistors connected to the electrode pad at its source terminal, a p-channel field effect transistors connected to the electrode pad at its source terminal, a first control line connected to the drain terminal of the n-channel field effect transistor, a second control line connected to the drain terminal of the p-channel field effect transistor, a third control line connected to the gate terminals of the n-channel field effect transistor and the p-channel field effect transistor, and a control circuit for supplying control signals to the first, second and third control lines. By this configuration, the voltage of the electrode pad can be arbitrarily controlled by adjusting the input level at the gate terminals.01-08-2009
20090009456LIQUID CRYSTAL DISPLAY DEVICE AND IMAGE DISPLAY METHOD THEREOF - High quality images on liquid crystal panel can be obtained alleviating variations of the brightness and color among regions, in which backlight is divided when emission luminance of the backlight is controlled in each region based on image signal. A backlight device is divided into multiple regions, and has a configuration in which light emitted from a light source of each of the regions is allowed to leak to other regions. A maximum gradation detector detects a maximum gradation of a regional image signal displayed on each of the regions of the liquid crystal panel. An image gain calculator obtains a gain to be multiplied to each regional image signal by using luminance bitmap held by luminance bitmap memory. An emission luminance calculator obtains an emission luminance of light to be emitted by each light source.01-08-2009
20120112991LIQUID CRYSTAL DISPLAY DEVICE AND METHOD FOR CONTROLLING DISPLAY OF LIQUID CRYSTAL DISPLAY DEVICE - An embodiment of a liquid crystal display device includes: a liquid crystal panel including pixels arranged in a pixel; and a backlight that irradiates it with light. In at least one example embodiment, the pixels included in the liquid crystal panel each include picture elements different in color. The picture elements are each provided with a color filter corresponding to the color of the picture element. The liquid crystal display device includes: an aperture ratio converting section that, to reduce optical cross talk, decreases an aperture ratio for inputted image data and outputs data of the aperture ratio; and a backlight data converting section that, to supplement the aperture ratio for the image data which is decreased by the aperture ratio converting section, converts data to increase a backlight luminance. This backlight luminance control prevents or reduces optical or electrical cross talk.05-10-2012
20080309602Video display device capable of compensating for display defects - A video display device capable of compensating for display defects, comprising: liquid crystal panel for displaying an image through a pixel matrix; a data driver for outputting data to data lines of the liquid crystal display panel; a gate driver for driving the gate lines of the liquid crystal display panel; a timing controller for receiving compensated data, uncompensated data and synchronizing signals to output a gate control signal to the gate driver and to output both resultant data and a data control signal to the data driver; and a memory for storing information on point defect information on the liquid crystal display panel, and at least one of horizontal and vertical line defects of the liquid crystal display panel of the liquid crystal display panel; and a data compensation circuit for receiving display data and synchronizing signals, and outputting compensated data to the timing controller based on the information in the memory and uncompensated data to the timing controller, wherein the data compensation circuit includes a vertical line compensator for compensating a vertical line defect of the liquid crystal display panel, a horizontal line compensator for compensating a horizontal line defect of the liquid crystal display panel, and a multiplexer for selecting an output from one of the vertical line compensator and the horizontal line compensator in accordance with whether a defect is a vertical line defect or a horizontal line defect.12-18-2008
20100097306Gamma voltage conversion device - Gamma voltage conversion device includes a gamma voltage conversion circuit, an amplifier, and a gamma voltage adjusting circuit. The gamma voltage conversion circuit generates a first gamma voltage conformed to a first gamma curve according to a grey level. The amplifier includes a first input end receiving the first gamma voltage, a second end, and an output end. The amplifier outputs the first or a second gamma voltage conformed to a second gamma curve according to the grey level according to the first and the second ends of the amplifier. The gamma voltage adjusting circuit coupled between the second input end and the output end of the amplifier controls the amplifier to output the first or the second gamma voltage as the gamma driving voltage according to the grey level and a gamma curve selection signal.04-22-2010
20090002303Liquid crystal display capable of compensating common voltage signal thereof - An exemplary liquid crystal display includes a liquid crystal panel having a plurality of pixel units arranged in rows, a scanning circuit configured to activate the pixel units row by row by outputting a plurality of corresponding scanning signals, a data circuit configured to provide data voltage signals to the activated pixel units, and a common voltage circuit. Each pixel unit includes a coupling member. When a row of pixel units is activated, all the coupling members in the row of pixel units cooperatively generate a coupling signal according to the data voltage signals applied to the activated row of pixel units, and superpose the coupling signal to the corresponding scanning signal so as to form a feedback signal. The common voltage circuit adjusts a reference voltage signal according to the feedback signal, and provides at least one common voltage signal to the pixel units.01-01-2009
20090002301Liquid crystal display and driving method thereof - A liquid crystal display includes a liquid crystal display panel having a plurality of data lines, a plurality of gate lines, and a plurality of liquid crystal cells, a timing controller to determine gray levels of input digital video data and a time at which a polarity of a data voltage to be supplied to the data lines is inverted and generate a dynamic charge share control signal to indicate a time at which the gray level of the data voltage is changed from a white gray level to a black gray level and a time at which the polarity of the data voltage is inverted, and to detect weakness patterns in which the data of the white gray level and the black gray level are regularly arranged in the input digital video data and generate a dot inversion control signal for widening a horizontal polarity inversion time of data voltages to be supplied to the data lines when the weakness patterns are input, a data driving circuit to convert the digital video data from the timing controller into the data voltage, change the polarity of the data voltage, supply any one of a common voltage and a charge share voltage between a positive data voltage and a negative data voltage to the data lines in response to the dynamic charge share control signal, and widen the horizontal polarity inversion time of the data voltages in response to the dot inversion control signal, and a gate driving circuit to sequentially supply a scan pulse to the gate lines under the control of the timing controller, wherein the liquid crystal display panel includes first and second liquid crystal cell groups whose polarity is inverted every 2 frame periods, and a polarity inversion time of the first liquid crystal cell group and a polarity inversion time of the second liquid crystal cell group overlap.01-01-2009
20080272999DISPLAY DEVICE, DISPLAY DRIVER AND IMAGE DISPLAY METHOD - In a display device and a display driver, when a grayscale of a display image is equal to or lower than a specific grayscale value obtained from a histogram of the display image, a display grayscale is extended with a linear function. On the other hand, when a grayscale of a display image is equal to or higher than the specific grayscale value, histogram equalization of a part higher than the specific grayscale value is performed, and the display grayscale is extended with a non-linear function obtained from the histogram equalization.11-06-2008
20080309603Liquid crystal display capable of adjusting brightness of backlight thereof and method for driving same - An exemplary liquid crystal display (12-18-2008
20080309600DISPLAY APPARATUS AND METHOD FOR DRIVING THE SAME - A display apparatus includes pixels, a signal controller, a gray-scale voltage generator, and a data driver. The signal controller converts input image signals having a first frame frequency to first and second output image signals having a second frame frequency. The second output image signal is an interpolation between the input image signal for the present frame and an input image signal for a next frame after the present frame. The gray-scale voltage generator outputs a first gray-scale voltage group and a second gray-scale voltage group. The data driver converts the first output image signal to a first data voltage based on the first gray-scale voltage group and converts the second output image signal to a second data voltage based on the second gray-scale voltage group, and outputs the first and second data voltages to the pixels in a present frame.12-18-2008
20100033414LIQUID CRYSTAL DISPLAY AND METHOD OF CONTROLLING COMMON VOLTAGE THEREOF - A liquid crystal display includes a liquid crystal panel having a plurality of pixels, a lookup table which stores information about a plurality of digital common voltages, each of the plurality of digital common voltages corresponding to at least one gray value, a timing controller which analyzes gray characteristics of image signals to be displayed on the liquid crystal panel and which selects one of the digital common voltages based on an analysis result, and a common voltage generator which generates an analog common voltage in response to the digital common voltage selected by the timing controller and which supplies the analog common voltage to the liquid crystal panel.02-11-2010
20090121994Display Device, Liquid Crystal Monitor, Liquid Crystal Television Receiver, and Display Method - In one embodiment of the present invention, a display device is disclosed wherein if a frame luminance is less than a maximum value, the device creates a difference between luminance outputs in the two subframes and sets the luminance difference to a value less than a sub-maximum luminance which is a maximum luminance output in one subframe. With the arrangement, no complete switching of the subframes in which luminance outputs are made occurs at a grayscale level where low luminance replaces high luminance or vice versa. Thus, the grayscale level-luminance curve continues smoothly.05-14-2009
20090189840DISPLAY APPARATUS AND METHOD FOR DRIVING THE SAME - A display apparatus includes a backlight assembly generating a light; a sensor sensing an amount of the light and color coordinates of the light to generate sensing information; a display panel receiving the light and displaying an image in response to a gray-scale voltage; a gray-scale compensation unit receiving M-bit source data and compensating a gray-scale of the source data in response to the sensing information to generate N-bit first compensation data; and a data driver converting the first compensation data into gray-scale voltage and proving the gray-scale voltage to the display panel.07-30-2009
20090167658Image display device - In one embodiment of the present invention, luminance information of a video signal inputted thereto is weighted by a weighting section. An image characteristic value determination section, by one frame, takes an average of the weighted luminance information, thereby determining an image characteristic value of one frame. A backlight controlling section sets luminance of the backlight at a backlight luminance determination section in accordance with the image characteristic value determined by the image characteristic value determination section and performs luminance correction.07-02-2009
20090153457Display apparatus and method for driving the same - A display apparatus includes a light source, a liquid crystal display element, and a signal generating unit. The signal generating unit includes first to third correction values calculation unit, and a correction value calculating unit. The first correction value calculation unit detects a gray scale of an image signal and calculates a first correction value on the basis of the detected gray scale. The second correction value calculation unit detects a polarity of a voltage component in response to the image signal and calculates a second correction value on the basis of the detected polarity. The third correction value calculation unit detects a wavelength and/or luminance of the light and calculates a third correction value on the basis of the detected wavelength and/or luminance. The correction value calculation unit calculates a correction value for correcting the voltage component on the basis of the first to third correction values.06-18-2009
20080266228BOOSTER POWER SUPPLY CIRCUIT THAT BOOSTS INPUT VOLTAGE - A first control switch is connected between a first terminal to which one terminal of a first boosting capacitor element is connected and a supply node of an input voltage. A second control switch is connected between a second terminal to which the other terminal of the first boosting capacitor element is connected and the supply node of the input voltage. A first switch element is connected between a third terminal to which one terminal of a second boosting capacitor element is connected and at which an output voltage is generated and the first terminal. A second switch element is connected between a node of a reference voltage side of the input voltage and the second terminal. A control circuit detects the output voltage and controls the first and second control switches to obtain the desired output voltage on the basis of a detection result.10-30-2008
20080266227METHOD FOR DRIVING LIQUID CRYSTAL DISPLAY DEVICE, LIQUID CRYSTAL DISPLAY DEVICE, AND ELECTRONIC DEVICE - An object of the present invention is to provide a driving method of a liquid crystal display device for improvement of image quality and a liquid crystal display device in which the driving method is used. One frame period is divided up into an n (n: integer, n≧3) number of periods (hereinafter referred to as subframe periods). Furthermore, a voltage is applied to a liquid crystal so as to correct for a loss in luminance resulting from response speed of the liquid crystal. The voltage for correction is applied during subframe periods other than the first subframe period.10-30-2008
20100007591PIXEL UNIT FOR A DISPLAY DEVICE AND DRIVING METHOD THEREOF - A pixel unit and driving method thereof are disclosed. The pixel unit includes a switch, a storage element and a first multiplexer. The switch develops a charge transfer path according to a scan signal associated with a scan line. The storage element has a first electrode coupled to the switch and a second electrode coupled to a reference voltage for receiving a pixel voltage via the charge transfer path. The first multiplexer is coupled to the second electrode of the storage element for selectively providing the reference voltage with a default value and the reference voltage with a determined value to the second electrode of the storage element according to a modulating signal. The driving method enlarges the voltage range of the first electrode of the storage element for enhancing the contrast ratio of the display panel.01-14-2010
20100127960LIQUID CRYSTAL DISPLAY - This document relates to a liquid crystal display capable of improving picture quality by compensating for difference in charge between liquid crystal cells. The liquid crystal display comprises a liquid crystal display panel; a gate driving circuit; a charge difference compensation circuit configured to generate, in a specific gray level range, analog positive gamma voltages having a first reference level and analog negative gamma voltages having a second reference level in synchronization with a first scan time at which a first gate line is driven, and generate the analog positive gamma voltages having a first compensation level that is lower than the first reference level and the analog negative gamma voltages having a second compensation level that is higher than the second reference level in synchronization with a second scan time at which a second gate line is driven; and a data driving circuit.05-27-2010
20090058779LIQUID CRYSTAL DISPLAY ELEMENT, METHOD OF DRIVING THE SAME, AND ELECTRONIC PAPER INCLUDING THE SAME - The prevent invention provides a liquid crystal display element capable of displaying an image in a short time during screen rewriting, a method of driving the same, and an electronic paper including the same. A liquid crystal display element includes: B, G, and R display units that have liquid crystal layers (not shown in FIG. 03-05-2009
20100079362Overdrive Compensation/Update Adaptable to Dynamic Gamma Generator - An overdrive system adaptable for a dynamic gamma generator is disclosed. A current gray-to-voltage converter (G/V) converts image data of a current frame from gray code to voltage level, and a previous gray-to-voltage converter (G/V) converts image data of a previous frame from gray code to voltage level. The voltage level of current frame and the voltage level of previous frame are inputted to an overdrive-voltage lookup table to retrieve an overdrive voltage level. Afterwards, a voltage-to-gray converter (V/G) converts the retrieved overdrive voltage level from voltage level back to gray code, resulting in an overdrive gray code. Accordingly, the overdrive gray code is compensated. Alternatively, the overdrive gray code is used to update an overdrive-gray-code lookup table, an output gray code of which is fed to the source driver.04-01-2010
20100085290Use of on-chip frame buffer to improve LCD response time by overdriving - A method and system is disclosed for improving the response time of displays, such as liquid crystal displays (LCDs). The method includes receiving a target picture frame and comparing it to a current picture frame. If the comparison shows that a display may be unable to transition from a current pixel intensity level to a target pixel intensity level within a specified time period, then the pixels that correspond to those current pixel intensities that may not be reach target pixel intensities may be overdriven. This overdriving of one or more pixels may allow the pixel to reach the target pixel intensity within the specified time period.04-08-2010
20080303767VIDEO DISPLAY DRIVER WITH GAMMA CONTROL - Voltage generator circuitry for providing a plurality of voltages for use in gamma compensation of a video signal.12-11-2008
20080211757IMAGE PROCESSING DEVICE AND METHOD THEREOF AND IMAGE DISPLAY DEVICE - Gray scale distribution of an input image signal is obtained through statistics to determine the contrast characteristic of the input image signal. Based on the gray scale distribution, by a look up table, corresponding gamma setting values are derived and stored in a register. The register outputs the stored gamma setting values to a gray scale voltage generation circuit to adjust the gray scale voltage. Therefore, the display contrast and display quality are improved.09-04-2008
20090085849Fast Overdriving Method of LCD Panel - A driving method for a liquid crystal display (LCD) panel is provided. The method comprises applying corresponding overdriving data for source data to the LCD panel at the beginning of a frame; applying black data to the LCD panel before the end of the frame, wherein the polarities of the applied black data are the same as the pixel electrode driving polarity at the beginning of a next frame; and applying the source data to the LCD panel at a time between the application of the overdriving data and the application of the black data. The driving method of the invention eliminates the need for large TFTs by reducing the voltage change between the end of a previous frame and the beginning of a current frame, and also can perform pre-charging for the pixel electrodes without adding any other device.04-02-2009
20090278777PIXEL CIRCUIT AND DRIVING METHOD THEREOF - A pixel circuit and a driving method thereof are provided. The pixel circuit includes a pixel capacitor, a storage capacitor, a first transistor and a second transistor. A common node is between the storage capacitor and the pixel capacitor. The first transistor is electrically connected between a data line and the common node, and a gate thereof is electrically connected to a first gate line. The second transistor is electrically connected between the common node and a gray level voltage, and a gate thereof is electrically connected to a second gate line. The first gate and the second gate line are adjacent.11-12-2009
20080316157LIQUID CRYSTAL DISPLAY AND DRIVING METHOD THEREOF - A liquid crystal display comprising: a receiver for receiving power and differential signal; a backlight power supply which supplies the power to a backlight unit; a power-off sensor which senses power-off of the backlight power supply and distorts one of the differential signals; and a controller which senses the distortion of the differential signal and generates an after-image removing gray-scale signal.12-25-2008
20090289883LIQUID CRYSTAL DISPLAY AND METHOD OF DRIVING THE SAME - A liquid crystal display (LCD) and a method of driving the LCD in which the LCD includes a liquid crystal panel divided into a plurality of display regions, each of the display regions having a plurality of pixels; and a timing controller receiving a primitive image signal for displaying an image in the display regions, and correcting the primitive image signal using a plurality of dithering patterns respectively corresponding to the display regions, wherein the display regions in contact with each other on at least one side correspond to different dithering patterns11-26-2009
20090262057LIQUID CRYSTAL DISPLAY AND METHOD OF DRIVING THE SAME - A liquid crystal display includes: a signal controller which converts a first image signal having a first gray level based on an original gamma coefficient into a second image signal having a second gray level based on a target gamma coefficient; a liquid crystal panel connected to the signal controller and which displays an image based on the second image signal; and a light-emitting unit connected to the signal controller and which provides light to the liquid crystal panel. The target gamma coefficient is less than or equal to the original gamma coefficient, and a luminance of the light provided by the light-emitting unit is adjusted by the signal controller to minimize an amount of luminance distortion of the image.10-22-2009
20090262056Liquid crystal display panel with color washout improvement and applications of same - A liquid crystal display (LCD) panel with color washout improvement. In one embodiment, the LCD panel a plurality of pixels, {P10-22-2009
20090262055Method and System for Grayscale Resolution Enhancement in Video Systems - A method and system for enhancing the grayscale resolution of display systems using 8-bit imaging arrays. The grayscale resolution is increased by providing a resolution greater than 8 bits. The on-time for each shade is subdivided in two sub-frames. During a first subframe, a full intensity light source is turned on and the imaging array processes five most significant bits of data, while least significant bits are stuffed with zeros. During a second subframe, the light source is turned on at reduced intensity and the imaging array processes the three least significant bits, which are left-shifted. The data byte for the second subframe is filled out using Digital Signal Processor (DSP) data obtained by over-sampling or interpolation. The lower order bits may be also stuffed with zeros.10-22-2009
20130100004DRIVING APPARATUS AND DISPLAY DRIVING SYSTEM INCLUDING THE SAME - A driving apparatus and a display driving system. The driving apparatus includes a first amplification unit receiving a first signal and outputting a driving signal of a positive polarity voltage with respect to a reference voltage, a second amplification unit receiving a second signal and outputting a driving signal of a negative polarity voltage with respect to the reference voltage, and a controller for determining a chopping signal applied to a chopping terminal of the second amplification unit such that an offset polarity of an output voltage of the first amplification unit and an offset polarity of an output voltage of the second amplification unit are the same.04-25-2013
20090167659LIQUID CRYSTAL DISPLAY AND DRIVING METHOD THEREOF - A liquid crystal display including a plurality of pixels includes a gray voltage generator generating a plurality of gray voltages, a data driver supplying data voltages selected from the gray voltages corresponding to image data to the pixels, a gate driver supplying gate voltages to gate lines of the pixels, a signal controller supplying a first control signal to the gate driver and the image data and a second control signal to the data driver for controlling the image data and comprising a dimming controller, the dimming controller generating a dimming signal based on an average gray of the image data over at least one frame and a common voltage generator generating at least one common voltage based on the dimming signal and applying the common voltage to the pixels. Therefore, the variation of the pixel voltage depending on the gray of the image data is decreased to improve image quality of the LCD.07-02-2009
20090167660LIQUID CRYSTAL DISPLAY AND CONTROL METHOD THEREOF - A liquid crystal display and a control method thereof are disclosed. The pixel of the liquid crystal display comprises: a first switch element, a second switch element, a first storage capacitor, a second storage capacitor, a first liquid crystal capacitor, and a second liquid crystal capacitor. The control method comprises: providing a first sub-pixel charge stage, a second sub-pixel charge stage, and a normal display stage. The first sub-pixel charge stage comprises: turning on the first switch element and the second switch to input a first gray level signal to the first storage capacitor, the second storage capacitor, the first liquid crystal capacitor, and the second liquid crystal capacitor. The second sub-pixel charge stage comprises: turning off the second switch element and inputting a second gray level signal to the first storage capacitor and the first liquid crystal capacitor. The normal display stage comprises: turning off the first switch element.07-02-2009
20080231574Light modulating display device using electrowetting effect - A light-modulating or display apparatus employs electrowetting effect to controllably modulate, directly or indirectly, the shape or location of one or more measures of liquid. In one embodiment, at least one measure of liquid obstructs the passage of at least some portion of light passing onto, through or reflected off said apparatus, and thereby controllably modulating the angle of distribution, amplitude or intensity of light emitted or reflected by or passing through said apparatus. In another embodiment, light is propagating within a media due to the phenomenon of Total Internal Reflection, and one or more properties of light escaping from within said media through one or more adjacent measures of liquid is controllably modulated due to said change of shape or location of the measures of liquid.09-25-2008
20080291144Liquid crystal display having common voltage modulator - An exemplary liquid crystal display includes a common electrode capable of having a predetermined common voltage applied thereto, a first common voltage line connected to the common electrode, a second common voltage line connected to the common electrode, and a common voltage modulator connected to the first and second common voltage lines. The first and second common voltage lines have no overlap and being at opposite sides of the liquid crystal display. The common voltage modulator is configured to receive a distorted common voltage from the common electrode via the first common voltage line, and apply a corresponding compensating voltage to the common electrode via the second common voltage line.11-27-2008
20080291143GRAY SCALE VOLTAGE DECODER AND DIGITAL-TO-ANALOG CONVERTER INCLUDING THE SAME - A gray scale voltage decoder includes a first decoding unit and a second decoding unit, in which the first decoding unit includes row blocks. Each of the row blocks receives one of a number of gray scale voltages and determines whether to output the received gray scale voltage in response to first bits of digital image data provided through data input lines formed along a column direction. Row blocks outputting the received gray scale voltage according to the same values of the first bits are arranged adjacently. The first decoding unit selects part of the gray scale voltages to output the selected gray scale voltages. The second decoding unit selects one of the gray scale voltages selected by the first decoding unit in response to second bits of the digital image data and outputs the selected gray scale voltage.11-27-2008
20080303766METHODS OF MEASURING IMAGE-STICKING OF A DISPLAY - A method of measuring image-sticking of a display is described. A display having N gray levels is provided. Next, an image-stick test frame having at least a first pattern having a low gray level and at least a second pattern having a high gray level is displayed on the display. After the image-stick test frame is displayed for a while, an image-stick region and a non-image-stick region are formed on the display. A measuring frame is then displayed on the display, wherein the non-image-stick region in the measuring frame has a standard gray level M. A plurality of middle gray levels is sequentially displayed on the image-stick region in the measuring frame. When the boundary between the non-image-stick region and the image-stick region in measuring frame is the lightest, the middle gray level is converted into an image-sticking level.12-11-2008
20080284700Liquid crystal display device - To suppress degradation of image quality caused by using an AC drive method so as to display a high-quality image. If a drive state of each of subpixels at a time when a gray-scale voltage higher than a counter voltage applied to a counter electrode is applied to a pixel electrode is defined as a positive drive state and if the drive state of each subpixel at a time when a gray-scale voltage lower than a counter voltage applied to the counter electrode is applied to the pixel electrode is defined as a negative drive state, an image line drive circuit changes the drive state of each subpixel from the positive drive state to the negative drive state or from the negative drive state to the positive drive state every two frames, as well as inverts a phase of the drive state of each subpixel every N (N≧4) frames. If a gray-scale voltage to be provided to each of image lines by an image line drive circuit in a frame A that is a first frame immediately after the phase inversion is defined as VA, and if a normal gray-scale voltage to be provided to each of the image lines by the image line drive circuit in a frame B that is a normal frame is defined as VB, |VA|<|VB| is satisfied at least with respect to a halftone.11-20-2008
20080211759DIGITAL IMAGE DISPLAYS - A method of adjusting a signal for a digital display where the input signal includes a number of discrete input intensity values which causes the display to give actual output signals having discrete output intensity values, and where the relationship between the input signal to actual output signal departs from a desired input signal to output signal relationship, comprises the steps of (i) considering at least a first input value and a first actual output value for the first input value, (ii) finding a second input value and a second actual output value for the second input value where the second actual output value is closer to the desired value for the first input value, (iii) recording a relationship between the first input value and the second input value, and finally (iv) substituting the second input value for the first input value in the signal. The method may be carried out for all input values.09-04-2008
20080284699Picture Display Apparatus and Method - A picture display apparatus exploiting a liquid crystal display is disclosed. This picture display apparatus (11-20-2008
20080273000METHOD OF PREVENTING FLICKER, CIRCUIT FOR PERFORMING THE METHOD, AND DISPLAY APPARATUS HAVING THE CIRCUIT - A method for preventing flicker in a display apparatus, a circuit for performing the method and a display apparatus which includes the circuit. The method includes displaying an inspection image on a plurality of sensing pixels formed in a display panel of the display apparatus, sensing an amount of light of the inspection image and outputting sensing signals corresponding to the amount of light of the inspection image, adding the sensing signals by every frame, detecting a maximum value and a minimum value of sum values of the sensing signals, producing a flicker index using the maximum value and the minimum value detected, comparing the flicker index with a predetermined threshold value such that a present common voltage applied to the display panel is maintained when the flicker index is smaller than the threshold value. Therefore, the display quality of the display apparatus may be improved.11-06-2008
20080272998Image Display Device and Image Display Method - An image display device and an image display method able to display a middle gray-scale by using a plurality of pixels or fields and, at the same time, improve viewing angle characteristics are provided. When displaying an image via a direct view type liquid crystal display screen, a gray-scales of an input video signal is converted to characteristic values (transmittances) of pixels two-dimensionally arranged with respect to the display image, and the gray-scale is converted so as to include, among a plurality of pixels or fields expressing a middle gray-scale, at least one pixel or field converted to a first characteristic value obtained by adding a positive correction value to the gray-scale of the input video signal, and at least one pixel or field converted to a second characteristic value obtained by adding a negative correction value to the gray-scale of the input video signal.11-06-2008
20090079683METHOD FOR PIXEL GRADATION EXTENSION, DRIVE METHOD AND APPARATUS FOR CHARGING TIME OF PIXEL CAPACITANCE - The present invention relates to a method of extending a pixel gray scale. The secondary gray scale levels with different charging times and the same gray scale voltage are formed by controlling a charging time of the gray scale voltage of every primary gray scale level and refining the level, wherein, the gray scale voltage of the every secondary gray scale level is the same as that of the corresponding primary gray scale level, and its charging time corresponds to the secondary gray scale level. The primary gray scale level of the display pixel of the liquid crystal panel is extended by using this method and the disadvantage of the imperfect display brought forward by the control method using frame rate in the prior art is overcome. The present invention further provides a drive method of controlling the pixel charging time and a drive apparatus thereof, which realizes the pixel gray scale extension by controlling the charging time of the pixel capacitance. It overcomes the disadvantage that a grid strip may be formed visually using the characteristic of the visual retention and the visual inertia of the human eyes while largely increasing the number of colors that can be displayed.03-26-2009
20090015532DISPLAY DEVICE AND DRIVING CIRCUIT THEREOF - In a display device such as a liquid crystal display, a processing for compressing a range of display data (grayscale) to a low grayscale side (a grayscale range where response is fast) except for a high grayscale side (a grayscale range where response is slow) at a predetermined compression ratio to conduct display according to response characteristic of transition between grayscales and a temperature state and a processing for increasing a light amount of a backlight to compensate for luminance change due to the compression are performed, for example, in a liquid crystal panel of TN liquid crystal. Thereby, response can be made fast even at a low temperature time.01-15-2009
20090015531DRIVING SYSTEM AND METHOD FOR LIQUID CRYSTAL DISPLAY - A driving system and method for liquid crystal display is disclosed. The system stores only the driving values corresponding to specific grayscale values of pixels on a current frame and specific grayscale values of pixels on a previous frame. The stored driving values are then used by an operation processing unit of the system to calculate out driving values to be applied to the current frame. Moreover, the system is provided with a logic judging unit for preventing the noises of the frame from being overdriven.01-15-2009
20090251399DYNAMIC CONTRAST RATIO PROCESSING METHOD AND APPARATUS OF LIQUID CRYSTAL DISPLAYING APPARATUS - The present invention relates to a dynamic contrast ratio processing method and apparatus of a liquid crystal displaying apparatus. The method includes: performing a histogram statistics processing on input data of the present frame, dividing a statistics processing result into N gray groups, and calculating the a data amount corresponding to each gray group; setting gray groups whose corresponding data amounts are larger than or equal to a first threshold as gray groups with priority, and setting a gray group having the highest luminance in gray groups with priority as a main priority gray group; determining whether the luminance of the main priority gray group of the present frame is the same as that of the main priority gray group of a previous frame; if it is, comparing data amounts with corresponding tolerance values to determine whether it is necessary to change the luminance control parameter, otherwise, obtaining the luminance control parameter of the present frame according to the main priority gray group of the present frame; outputting the luminance control parameter of the present frame at last. The present invention improves flickering phenomenon effectively and enhances picture quality.10-08-2009
20090201238Display Panel Driving Apparatus, Display Panel Driving Method, Display Apparatus, and Television Receiver - In a display panel driving apparatus which generates, based on an input gray scale, a gray scale of a first sub-frame and a gray scale of a second sub-frame so as to display the input gray scale as a result of a summation of respective display corresponding to the first sub-frame and the second sub-frame into which one frame is divided, and the gray scale of the second sub-frame being greater than the gray scale of the first sub-frame, for a response in which (i) the input gray scale of a subsequent frame is greater than an input gray scale of a previous frame and (ii) the input gray scale of the subsequent frame is not less than a first threshold gray scale, a gray scale of the first sub-frame in the subsequent frame is set not more than a second threshold gray scale, regardless of input gray scale of the subsequent frame. Thus, it is possible to reduce jaggy in an edge of a moving image in time-division driving.08-13-2009
20090096735Liquid crystal display having compensation circuit for reducing gate delay - An exemplary liquid crystal display includes a liquid crystal panel, a gate driving circuit, a data driving circuit, and a compensation circuit. The liquid crystal panel includes gate lines and data lines intersecting the gate lines. The compensation circuit includes capacitors corresponding to the gate lines. The gate driving circuit is configured for providing scanning signals to the gate lines in sequence. The data driving circuit is configured for providing gray scale voltages to the data lines. The compensation circuit is configured for compensating the scanning signals.04-16-2009
20090231256Digital gamma correction system and method - A digital gamma correction system for detecting a brightness of a liquid crystal panel, and correcting a gamma voltage, based on the detected brightness, includes an offset setter for setting the number of detection gray levels and a first detection area, for the detection of the brightness of the liquid crystal panel, a plurality of brightness detectors for detecting brightness values output from the first detection area for the detection gray levels, a controller for processing the brightness values detected by the brightness detectors, a non-linear interpolation data processor for processing a brightness value supplied from the controller, thereby generating non-linear interpolation data as a brightness variation rate according to the gray levels, a brightness corrector for generating gamma correction data for brightness values obtained by interpolating brightness values detected in a second detection area of another liquid crystal panel for a second number of detection gray levels, based on the non-linear interpolation data, and a memory for storing the gamma correction data generated from the brightness corrector.09-17-2009
20090231257LIQUID CRYSTAL DISPLAY DEVICE - Provided is a drive circuit low in power consumption and high in display quality for a liquid crystal display device that is used in a small-sized portable device. The liquid crystal display device includes liquid crystal display elements and a liquid crystal driving circuit. The liquid crystal driving circuit is mounted to one of the four sides of a liquid crystal display panel, and is capable of outputting two-system counter electrode voltages. A variable resistor circuit having a resistance value which is variably adjusted by a register is used to correct and output a gray scale voltage according to a position of a relevant scanning signal line. Equalization is also performed by short-circuiting two counter electrode signal lines.09-17-2009
20090213055DISPLAY DEVICE CAPABLE OF BRIGHTNESS ADJUSTMENT BY ADJUSTING GAMMA CURVE AND METHOD THEREOF - Provided is a display device capable of brightness adjustment by adjusting gamma curves thereof, without adjusting brightness of input video signals. The display device includes a memory unit, storing a plurality of gamma reference voltage value sets in accordance with a plurality of gamma curves; a microprocessor, for selecting one of the gamma reference voltage value sets stored in the memory unit; a gamma voltage generator, for generating a plurality of gamma reference voltages in response to the selected gamma reference voltage value set from the microprocessor; a data converter, for converting input video signals into video voltages in response to the gamma reference voltages provided from the gamma voltage generator; and a display panel, for displaying images in response to the video voltages from the data converter.08-27-2009
20090002302Liquid crystal display and driving method thereof - A liquid crystal display includes a liquid crystal display panel having a plurality of data lines, a plurality of gate lines crossing the plurality of data lines, and a plurality of liquid crystal cells, a timing controller to determine gray levels of input digital video data and a time at which a polarity of a data voltage to be supplied to the data lines is inverted, to activate a dynamic charge share control signal to indicate a time at which the gray level of the data voltage is changed from a white gray level to a black gray level and a time at which the polarity of the data voltage is inverted, to detect weakness patterns in which the data of the white gray level and the black gray level are regularly arranged in the input digital video data, and to activate a dot inversion control signal for widening a horizontal polarity inversion period of data voltages to be supplied to the data lines when the weakness patterns are input, a data driving circuit to convert the digital video data from the timing controller into the data voltage, to convert the polarity of the data voltage, to supply any one of a common voltage and a charge share voltage between a positive data voltage and a negative data voltage to the data lines in response to the dynamic charge share control signal, and to widen the horizontal polarity inversion period of the data voltages in response to the dot inversion control signal, and a gate driving circuit to sequentially supply a scan pulse to the gate lines under the control of the timing controller.01-01-2009
20090207114LIQUID CRYSTAL DISPLAY DEVICE - A liquid crystal display device includes: a liquid crystal display panel having a matrix of pixels arranged in rows and columns; a light unit overlapping the liquid crystal display panel to illuminate the liquid crystal display panel, including a light guide plate composed of a plurality of light guide blocks; and a video signal output unit for outputting a first video signal to pixels facing the light guide blocks and a second video signal to pixels facing a gap between adjacent light guide blocks, respectively, wherein the video signal output unit provides the second video signal corrected to correspond to a corrected gradation value.08-20-2009
20090102771Image processing apparatus, image display and image processing method - An image processing apparatus includes: a detection means for detecting a motion index of an input picture; a generation means for generating a mask signal for a fluctuation pixel region due to a line flicker component; a mask processing means for performing a mask process on the motion index through the use of the mask signal; a frame division means; and a gray-scale conversion means for selectively performing, on the basis of the motion index subjected to the mask process, adaptive gray-scale conversion on a luminance signal in a pixel region where a motion index is larger than a predetermined threshold value so that, while maintaining total time integral value of the luminance signal in the unit frame period as it is, a high luminance period and a low luminance period are allocated to sub-frame periods in the unit frame period, respectively.04-23-2009
20090256791METHOD AND A DEVICE FOR COMPENSATING RESPONSE TIME OF LIQUID CRYSTAL DISPLAY - The present invention relates to a method for compensating response time of liquid crystal display and a device therefor. The compensating method comprises: receiving gray scale data of a picture in present frame and obtaining a first additional driving value according to the comparison result between gray scale data of the picture in present frame and gray scale data of the picture in previous frame; collecting the temperature value of liquid crystal layer and obtaining a temperature driving value according to said temperature value; and generating a second driving value that is applied to pixels according to the first additional driving value and the temperature driving value. The compensating device comprises: a first additional driving value module for obtaining a first additional driving value; a temperature driving value module for collecting the temperature value of liquid crystal layer and obtaining a temperature driving value according to said temperature value; and a second additional driving value module for generating a second additional driving value. The present invention can effectively reduce the response time of liquid crystal display and mitigate the streaking problem.10-15-2009
20090256790Liquid crystal display having dynamic backlighting - A liquid crystal display includes a liquid crystal panel for displaying images, a light guide plate, and light sources. The light guide plate includes light emitting areas. The light sources provide light to the corresponding light emitting areas respectively. When an area of the liquid crystal panel corresponding to a light emitting area of the light guide plate displays a high brightness gray level, the corresponding light source provides light with high brightness. When an area of the liquid crystal panel corresponding to a light emitting area of the light guide plate displays a low brightness gray level, the corresponding light source provides light with low brightness.10-15-2009
20090315818Method and Related Apparatus for Driving a Flat Panel Display - A method for driving a flat panel display includes receiving image data corresponding to a picture with a gray level between a first gray level and a second gray level, generating a plurality of frame signals corresponding to a plurality of pixels in the flat panel display based on the image data of the picture, dividing each of the plurality of frame signals into a plurality of sub-frame signals, and adjusting levels of the plurality of sub-frame signals of each frame signal based on the first gray level and the second gray level to make a gray level shown by each pixel corresponding to each frame signal to be equal to the gray level of the picture.12-24-2009
20090273552Display apparatus and driving method thereof - A display apparatus includes a panel part, a data driver, and a gate driver. The panel part includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels each of which is connected to one gate line of the gate lines and one data line of the data lines. The data driver receives image data and outputs a data signal to the data lines. The gate driver part is disposed on the panel part and applies gate signals to the gate lines. Periods of clock signals controlling the level of the gate signals are different from that of the gate signals. Thus, power consumption of the display apparatus is substantially effectively reduced.11-05-2009
20100013749Electronic Device for Enhancing Voltage Driving Efficiency for a Source Driver and LCD Monitor Thereof - An electronic device for enhancing voltage driving efficiency for a source driver and a liquid crystal display (LCD) monitor is disclosed. The electronic device includes a reference voltage generator, a plurality of first coupling lines, a second coupling line wider than the first coupling lines, a data statistical unit and a reference voltage modulating module. The reference voltage generator generates a plurality of grayscale reference voltages. Each first coupling line and the second coupling line are utilized for transmitting one of the grayscale reference voltages. The data statistic unit statistically calculates a plurality of grayscale data values to generate a statistical result indicating a grayscale reference voltage corresponding to the most of the grayscale data values among the grayscale reference voltages. The reference voltage modulating module adjusts transmission relationship between the grayscale reference voltages and the first coupling lines and the second coupling line according to the statistic result.01-21-2010
20090079682Method for driving liquid crystal display apparatus - In one embodiment of the present invention, when a still image is displayed, applied voltages respectively corresponding to a total of n (n being an integer of not less than 4) types of gradation 03-26-2009
20090303167Liquid Crystal Display Device - A liquid crystal display device which can enhance power-consumption reduction efficiency irrespective of inputted image data is provided. The liquid crystal display device includes: a liquid crystal display panel which includes a display region formed of a mass of a plurality of pixels; a backlight which has a plurality of light sources receiving a lighting control independently, and has a region thereof where the light sources are mounted partitioned into a plurality of lighting regions; and a control circuit which converts image data inputted from the outside into a video signal to be supplied to the liquid crystal display panel and performs the lighting control of the backlight, wherein the control circuit forms a first frame in which image data having a grayscale higher than a grayscale of image data to be displayed is formed and a second frame in which image data having a grayscale lower than a grayscale of the image data to be displayed are formed, and alternately displays the image data in the first frame and the image data in the second frame, and the backlight performs the lighting control for every lighting region of the backlight in conformity with a display content of the liquid crystal display panel.12-10-2009
20100188323OUTPUT BUFFER AND SOURCE DRIVER USING THEREOF - An output buffer for providing an output voltage signal includes an operational amplifier, a controller and a power circuit. The operational amplifier provides the output voltage signal according to an input voltage signal. The controller judges whether a reference signal corresponding to the input voltage signal satisfies an energy-saving condition, and triggers an energy-saving operation event if yes, or triggers a normal operation event if not. The power circuit provides an energy-saving power signal to drive the operational amplifier in response to the energy-saving operation event and provides a normal power signal to drive the operational amplifier in response to the normal operation event, such that the operational amplifier provides the output voltage signal according to the input voltage signal. A voltage level of the normal power signal is higher than a voltage level of the energy-saving power signal.07-29-2010
20100238103Method to Obtain Uniform Grayscale to Grayscale Response Times in LCDs and a System Thereof - Despite rapid advances in science and technology of liquid crystal display (LCD); elimination of motion related artifacts and preservation of color purity in moving images have remained elusive because gray-scale to gray-scale response time, i.e., time taken to switch pixels from one gray-scale to another depends on the initial and final gray shades. A technique wherein gray scale to gray scale response times are less dependent on the initial and final gray shades as compared to other addressing techniques for driving matrix LCD is reported. We also found that the response times are about the same as that of a pixel driven with simple square waveforms and therefore the effect of duty cycle due to matrix addressing is minimal with distributed waveforms of this technique.09-23-2010
20090109156ACTIVE DEVICE ARRAY SUBSTRATE, PIXEL STRUCTURE THEREOF AND DRIVING METHOD THEREOF - A pixel structure including a first transparent electrode, a second transparent electrode, a reflective electrode, a first active device and a second active device is provided. The reflective electrode connects the second transparent electrode, while the first transparent electrode is electrically insulated from the second transparent electrode and the reflective electrode. The first active device electrically connects the first transparent electrode to apply a first driving voltage to the first transparent electrode. The second active device electrically connects the second transparent electrode and the reflective electrode to apply a second driving voltage to the second transparent electrode and the reflective electrode. The first driving voltage differs from the second driving voltage. An active device array substrate having the abovementioned pixel structure and a driving method of the active device array substrate are also provided and applied to a transflective liquid crystal display for improving the display quality thereof.04-30-2009
20100134395LIGHTING SYSTEM AND DISPLAY DEVICE EQUIPPED WITH THE SAME - A display apparatus that can perform even a high quality moving picture display and provides improved color purity, and an illumination device used in the display apparatus are provided. The display apparatus includes: an illumination device (06-03-2010
20100134394LIQUID CRYSTAL DISPLAY DEVICE, MOBILE ELECTRONIC APPARATUS, IN-VEHICLE ELECTRONIC APPARATUS - A liquid crystal display device (06-03-2010
20090128473ACTIVE MATRIX DISPLAY DEVICES - Active matrix display devices capable of improving aperture ratio of pixels and of smoothing intermediate colors are presented. An active matrix display device has static random access memory (SRAM) devices and digital to analog converters (DAC), which are both allocated to each of sub-pixels divided by a pixel. The SRAM stores an input digital data with over two bits, which can be used as gradient information for gray scale display of the sub-pixels. The input digital data is converted into analog data for display by the DAC. Gray scale display of the sub-pixels can be performed based on gray scales determined by the analog data for display. The pixel can be used to display multiple gray scales according to combinations of areas and gray scales of the sub-pixels.05-21-2009
20090002300System and method to drive display matrix - A system and method to drive display matrix, comprising: a voltage level generator to provide predetermined voltages, a row voltage selector to select a group of voltages from the voltage level generator depending on select vector to drive row drivers, a column voltage selector to select a group of voltages from the voltage level generator depending on data vector to drive column drivers, and a controller to generate control signals to scan the display as dictated by addressing technique.01-01-2009
20090066624PRINTED CIRCUIT BOARD, DISPLAY APPARATUS HAVING A PRINTED CIRCUIT BOARD AND METHOD OF MANUFACTURING THE PRINTED CIRCUIT BOARD - A printed circuit board (“PCB”) includes a first pattern structure, a second pattern structure, a third pattern structure, and a fourth pattern structure. The first pattern structure includes a first ground pattern. The second pattern structure includes a first line pattern overlapping the first ground pattern and a second ground pattern electrically insulated from the first line pattern. The third pattern structure includes a third ground pattern overlapping the first line pattern and a second line pattern overlapping the second ground pattern. The fourth pattern structure includes a fourth ground pattern overlapping the second line pattern. Therefore, the PCB may decrease noise.03-12-2009
20090066623COLOR SEQUENTIAL LIQUID CRYSTAL DISPLAY AND METHOD OF DRIVING THE SAME - A color sequential liquid crystal display (LCD) and a method of driving the same are introduced herein. The method is implemented to change transmittance of a liquid crystal display (LCD) panel by inserting a pre-driving signal between two adjacent frames. The pre-driving signal can be adjusted by the gray level difference of the adjacent frames. The method is capable of not only improving accuracy of the color mixing of the color sequential liquid crystal display (LCD), but also resolving the prior art problem of uneven pixel displays resulted from the time difference of activating different gate line in sequences in the liquid crystal display (LCD) panel.03-12-2009
20090066622LIQUID CRYSTAL DISPLAY DEVICE - A liquid crystal display device includes a liquid crystal panel having a plurality of pixel units for displaying images, a timing controller for generating image data, a reference voltage generator for generating a reference voltage group, a plurality of voltage dividers, and a plurality of converters. Each voltage divider is used for dividing the reference voltage group into a respective level voltage group. The converters are used for converting the image data into a plurality of data signal voltages on the basis of the level voltage groups. Each pixel unit us used for showing various grey levels based on the data signal voltages.03-12-2009
20090243984Liquid crystal panel, liquid crystal panel device, display device, and projector - A liquid crystal panel includes: a liquid crystal containing liquid crystal molecules; a plurality of pixel electrodes that is capable of applying electric fields to the liquid crystal; a common electrode opposite to the plurality of the pixel electrodes through the liquid crystal; a first rubbing member that aligns the liquid crystal molecules in a first direction at an interface of the liquid crystal on a side of the pixel electrode; and a second rubbing member that aligns the liquid crystal molecules in a second direction at an interface of the liquid crystal on a side of the common electrode, wherein a transparent insulator layer is formed on an area on a side in a direction orthogonal to the first direction in the pixel electrode.10-01-2009
20100123653Apparatus for Providing Grayscale Voltages and Display Device Using the Same - An apparatus for providing grayscale voltages and a display device using the same are provided. The display device includes a grayscale voltage provider that provides grayscale voltages using a first reference voltage and a second reference voltage in accordance with a selection signal. A data driver applies data voltages to data lines using the grayscale voltages and an image signal. A gate driver successively provides a gate-on voltage to the gate lines. A display panel displays an image for each frame using the data voltages and the gate-on voltage.05-20-2010
20090219241Liquid crystal display device - A liquid crystal display device has a liquid crystal display panel which includes: a first substrate; a second substrate; a liquid crystal composition which is sandwiched between the first substrate and the second substrate; a pixel region which is formed of a plurality of pixels arranged in a matrix array on the first substrate, each pixel including a pixel electrode, a counter electrode which faces the pixel electrode in an opposed manner, and a switching element which is electrically connected with the pixel electrode; and a driver circuit which is mounted on the first substrate along a first side of the pixel region. In such a liquid crystal display device, the driver circuit is configured to rewrite a video signal in each pixel of the pixel region for every 1 frame period via the switching element, the driver circuit includes a first AC driving mode in which polarity of a video signal to be rewritten in a frame period succeeding to the 1 frame period is inverted, and a second AC driving mode in which the polarity of the video signal to be rewritten in the succeeding frame period is equal to polarity of the video signal in the 1 frame period, and a reference voltage of the video signal is corrected so as to decrease brightness of the pixel in the second AC driving mode.09-03-2009
20090096734LIQUID CRYSTAL DISPLAY AND METHOD OF DRIVING THE SAME - A method of driving a liquid crystal display apparatus is provided. Each pixel of the liquid crystal display apparatus has a first sub-pixel and a second sub-pixel. The method of driving the liquid crystal display apparatus includes receiving a selecting signal and then deciding the display mode of the liquid crystal display apparatus. When the liquid crystal display apparatus is in a normal display mode, the second sub-pixels are deactivated. When the liquid crystal display apparatus is on a restricted view-angle display mode, some of the second sub-pixels are chosen and activated.04-16-2009
20090322663DISPLAY DEVICE - A display device with low power consumption capable of canceling the collapse of gradation and skip of gradation in a high gradation part and a low gradation part and of displaying an even gradation in a wide range has been disclosed. The display device comprises a display element of dot matrix type having a display material with memory properties, a drive circuit that drives a pixel of the display element, and a control circuit that controls the drive circuit, wherein the control circuit executes an initialization step for applying a voltage pulse to initialize a pixel to be rewritten to bring the pixel into an initialization state and a gradation step for applying a voltage pulse to change the gradation state of a pixel, and in the gradation step, an alternating voltage pulse is formed in a pixel to be rewritten and the period and voltage of the alternating voltage pulse are varied in accordance with a gradation to be written.12-31-2009
20100053051 DISPLAY FOR HIGH BRIGHTNESS CONDITIONS - A device including a housing and a display provided on a surface of the housing. The device also includes a light sensor provided on the surface of the housing, and a controller coupled to the display and the sensor. The controller is configured to change a display mode of the display from a first display mode to a monochromatic display mode when a light level of ambient light sensed by the light sensor exceeds a threshold value.03-04-2010
20100053052LIQUID CRYSTAL DISPLAY DEVICE - In one embodiment of the present invention, a liquid crystal display device is disclosed, each pixel includes first and second subpixels, each of which includes a storage capacitor. Storage capacitor counter voltages applied independently to the storage capacitor counter electrodes of the first and second subpixels are varied within each vertical scanning period of the input video signal. As a result, each vertical scanning period of the input video signal includes a first subframe in which the first and second subpixels have luminances Y_SP03-04-2010
20090153458DRIVING METHOD AND DEVICE OF ELECTRO-OPTIC ELEMENT, AND ELECTRONIC EQUIPMENT - With the conventional technique, pixels can display different levels of grayscale resulting from irregularity of a relation in terms of position among selected sub-fields, when the same level of grayscale is displayed. The invention provides a pixel driving method that can include a selecting step of sequentially selecting, according to grayscale data, a plurality of first sub-field periods continuous with respect to one another and a plurality of second sub-field periods continuous with respect to one another and following consecutively the plurality of first sub-field periods in a direction moving away from a boundary of the plurality of first sub-field periods and the plurality of second sub-field periods, which is given as the origin, and a driving step of switching ON pixels during the selected sub-field periods.06-18-2009
20090153454Color Liquid Crystal Display Device and Gamma Correction Method for the Same - In one embodiment of the present application, a color liquid crystal display device is disclosed which can realize display having a high color reproducibility when a screen is viewed from an oblique direction as well as from a front direction, while improving a viewing angle dependence of γ-characteristics by employing a pixel division method. Gamma correction is carried out as follows independently for each R, G, and B with reference to R, G, and B correction tables so as to obtain a good color tracking. That is, the gamma correction is carried out such that chromaticity in the front view is shifted toward blue in an oblique hue correction range, which is determined by a pixel division ratio and the like, so as to reduce a shift of the chromaticity in the oblique view toward yellow in the oblique hue correction range, while maintaining a color balance in the other range (a gradation value range of 32 to 255 except for the oblique hue correction range). The present invention is suitable for a color liquid crystal display device employing the pixel division method.06-18-2009
20100295763IMAGE PROCESSING DEVICE AND METHOD THEREOF - An image processing device and a method thereof are provided. The image processing device includes a controller and an image processing unit. The controller generates a timing control signal according to an enabling signal. The image processing unit is coupled to the controller. The image processing unit receives a gray scale value of a pixel at a time and determines whether to change the gray scale value of the pixel at the time to a predetermined gray scale value according to the timing control signal. Thereby, the image quality is improved.11-25-2010
20080246713DISPLAY APPARATUS AND CONTROL METHOD THEREOF - A display apparatus includes a display panel that includes a plurality of pixels and a panel driver. The panel driver receives original image signals corresponding to successive frames which are displayed in a predetermined number within a predetermined period of time, forms an interpolation image signal on the basis of original image signals corresponding to two successive frames, and forms a non-image signal, and applies the original image signal, the interpolation image signal, and the non-image signal to the respective pixels during a display period.10-09-2008
20080246712Programmable Gray Level Generation Unit - The invention relates to a circuit arrangement (10-09-2008
20080246714IMAGE DISPLAY DEVICE, DISPLAY PANEL AND METHOD OF DRIVING IMAGE DISPLAY DEVICE - An image display device capable of applying a higher voltage than the original voltage to the pixel, without causing deterioration of the display quality is provided. The image display device includes: a plurality of pixels each including a main capacitive element as a display element performing display operation in accordance with image data supplied to one end thereof, and an auxiliary capacitive element having one end connected to the one end of the main capacitive element, and driving means for driving each of the pixels, while supplying an additional potential to the other end of the auxiliary capacitive element in each of the pixels, the additional potential being individually determined so that a voltage between both ends of the main capacitive element rises higher than an original voltage.10-09-2008
20080309601LIQUID CRYSTAL DISPLAY AND LIQUID CRYSTAL DRIVE CIRCUIT - A liquid crystal display includes pixels, gate lines, source lines and a drive means. Each of the pixels includes a TFT element, a liquid crystal element and an auxiliary capacitive device. One end of the liquid crystal device is connected to one end of the TFT device, and the auxiliary capacitive device is provided to be connected between the one end of the TFT device and an adjacent gate line. In a normal drive mode, the drive means drives each pixel on the basis of an image data acquired through correction which allows image luminance level of the current unit frame to be lowered by a predetermined amount. In an overdrive mode, the drive means drives each pixel on the basis of an image data which brings a larger amount of change of a voltage across the liquid crystal device between the previous unit frame and the current unit frame.12-18-2008
20080252582LUMINANCE COMPENSATION DEVICE AND METHOD THEREOF FOR BACKLIGHT MODULE - A luminance compensation device for a backlight module and a method thereof are provided herein. In the present invention, a light sensor unit is utilized to sense a light intensity of the backlight module. A difference parameter based on the sensed light intensity and a preset luminance is calculated. Then, a gamma curve, a video data, or light intensity of the backlight module is adjusted according to the difference parameter. As a result, the level of display quality affected by the temperature or the aging of the backlight module can be reduced.10-16-2008
20080218463DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME - A display device and a method for driving the same are disclosed. The display device driving method includes applying a first gray scale display voltage according to a first gamma curve to a liquid crystal layer during a first sub-frame period and applying a second gray scale display voltage according to a second gamma curve to the liquid crystal layer during a second sub-frame period. The first and second gamma curves are discontinuous at one or more gray scale values among all gray scale regions.09-11-2008
20090174641METHOD OF DRIVING LIQUID CRYSTAL DISPLAY DEVICE, AND LIQUID CRYSTAL DISPLAY APPARATUS - A drive circuit of a liquid crystal display device includes a driver circuit that applies a voltage pulse to a liquid crystal of the liquid crystal display device, and a control circuit that controls the driver circuit to change the liquid crystal to a initial tone and to change the initial tone to a high tone, an intermediate tone, or a low tone. The control circuit sets a tone energy difference so as to be smaller at the intermediate tone than at the high tone close to the initial tone, the tone energy difference being a difference between an application energy of the voltage pulse applied to the liquid crystal of the initial tone to display a predetermined tone and an application energy of the voltage pulse applied to display a tone different from the predetermined tone.07-09-2009
20090015530Optically addressed gray scale electric charge-accumulating spatial light modulator - A technique for modulating light by an optically addressed, electric charge accumulating spatial light modulator achieves substantially monotonic gray scale response. Embodiments digitally modulate the voltage across a photoreceptive material included in the spatial light modulator. The digital modulation scheme entails illuminating the photoreceptor with a series of light pulses propagating from an LCoS, in which the durations of the light pulses and their positions in time combine to produce binary-weighted equivalent rms voltages on the photoreceptor. The light pulses originate from a light-emitting diode or other switchable light source, and the timing of the light pulses is controlled such that they are emitted only when the associated LCoS is in a stable state. Emitting light pulses while the LCoS is in a stable state avoids non-monotonic behavior.01-15-2009
20120038545LIQUID CRYSTAL DISPLAY WITH PERIODICAL CHANGED VOLTAGE DIFFERENCE BETWEEN DATA VOLTAGE AND COMMON VOLTAGE - An exemplary liquid crystal display includes a plurality of pixel units each including a pixel electrode for receiving data voltages and a common electrode for receiving a common voltage having a constant value. The data voltages applied to each pixel electrodes are equal a sum of a main data voltage having a square waveform and an auxiliary voltage that is periodically changed at intervals each formed by four continuous frames. An absolute value of the auxiliary voltage is less than a voltage difference between the main data voltage and the common voltage. A sum of the auxiliary voltage is zero in a minimum period.02-16-2012
20100033413Liquid crystal display device and driving method thereof - A liquid crystal display device and a driving method thereof are provided which can increase a display grade by removing a DC residual image. The liquid crystal display device comprises: a liquid crystal display panel for displaying gray levels by a potential difference between a common electrode for applying a common voltage and pixel electrodes for applying data voltages; a common voltage regulating circuit for generating a variable common voltage which is longitudinally symmetrical with respect to a DC common voltage of a predetermined level and whose voltage level is stepwisely varied at predetermined intervals; and a black gamma reference voltage regulating circuit for adding the variable common voltage to an offset voltage set as a gamma reference voltage of a black gray level to generate a variable gamma reference voltage varying with respect to the gamma reference voltage of the black gray level, the variable gamma reference voltage of the black gray level being varied in synchronization with the variable common voltage.02-11-2010
20090153455GRAY INSERTION DEVICE AND LIQUID CRYSTAL DISPLAY - A gray insertion device and a liquid crystal display (LCD) are provided. The gray insertion device is adapted to the LCD. The LCD includes a source driver and a source driving line. The gray insertion device includes a gray insertion controller and a gray insertion switch unit. The gray insertion switch unit is disposed outside the source driver. The gray insertion switch unit is coupled to the source driving line and the gray insertion controller. The gray insertion controller controls the gray insertion switch unit to transmit a voltage to the source driving line according to a timing signal, wherein the voltage is not provided by the source driver. Thereby, the present invention not only achieves gray insertion effect, but also decreases the power consumption of the source driver.06-18-2009
20090085850Liquid crystal display device with OCB mode and method dividing one frame into two sub frames for driving same - A liquid crystal display device that operates in optically compensated bend mode includes a gate driving circuit, a data driving circuit, and pixel units. The gate driving circuit is configured for providing a gate signal to each of the pixel units. The data driving circuit is configured for providing a first voltage corresponding to a black signal in a first sub frame of a frame divided into two sub frames to each of the pixel units via a corresponding data line, and a second voltage corresponding to a gray level display signal in a second sub frame of the frame to each of the pixel units.04-02-2009
20090102770DISPLAY DEVICE - A display device includes a reflection type display unit reflecting light of a predetermined wavelength at a front surface side of the display device to display a first image at the front surface side; a light emission type display unit disposed at a back side of the reflection type display unit and displaying a second image different from the first image at the front surface side through the reflection type display unit; and an optical deflection element causing a viewing angle of the light emission type display unit to be smaller than a viewing angle of the reflection type display unit.04-23-2009
20090033607Optical display system and method, active and passive dithering using birefringence, color image superpositioning and display enhancement with phase coordinated polarization switching - A display apparatus includes a passive display, a light source, and a video signal input, in operation in response to a video signal the passive display modulates light from the light source to provide an image, and the intensity of the light source is controlled by the video signal.02-05-2009
20100245222ACTIVE ARRAY SUBSTRATE, LIQUID CRYSTAL DISPLAY PANEL AND METHOD FOR DRIVING THE SAME - An active array substrate, a liquid crystal display panel and method for driving the same are provided. The active array substrate includes a plurality of first strip electrodes and second strip electrodes. The sum of one width of the first stripe electrode and one pitch between two adjacent first stripe electrodes is greater than that of one width of the second strip electrode and one pitch between two adjacent second strip electrodes.09-30-2010
20100207860VIA DESIGN FOR USE IN DISPLAYS - A liquid crystal display (LCD) is provided having transistors disposed within via holes having elongated (e.g., rectangular or oval) contact areas. The use of via holes having elongated contact areas allows an opaque mask defining an aperture for light transmission to be lengthened, thereby increasing the overall area of the aperture. The increase in the area of the aperture may increase the amount of light that can pass through the aperture.08-19-2010
20100207859Liquid Crystal Display Device and Driving Method of the Same - There is provided a liquid crystal display device having: a liquid crystal panel (08-19-2010
20120249405SIGNAL PROCESSING DEVICE FOR LIQUID CRYSTAL DISPLAY PANEL AND LIQUID CRYSTAL DISPLAY INCLUDING THE SIGNAL PROCESSING DEVICE - A liquid crystal display system including a signal processing device uses interpolation to generate an intermediate image frame using previous image frame data and present image frame data. The system converts data of the intermediate image frame into transposed image data that is to be used to drive a liquid crystal display panel and display a corresponding image. The transposed image data and the present image data are subjected to a prespecified DCC process (dynamic capacitance compensation process) to thereby generate respective first and second compensation image data. Since the first compensation image data is generated based on the transposed image data and the transposition is configured to prevent over-compensation by the DCC process, over-compensation by the dynamic capacitance compensation process can be reduced or prevented.10-04-2012
20100007592Controlling the brightness control signal for a pixel of a liquid crystal display - The invention relates to controlling the brightness control signal for a pixel of a liquid crystal display. According to the invention, a method of controlling the brightness control signal for a first pixel of a liquid crystal display for displaying a predetermined image is provided, comprising the following steps: determining the intended brightness of the first pixel according to the predetermined image, determining the brightness of a second pixel, and calculating the brightness control signal for the first pixel on the basis of a function of the intended brightness of the first pixel and the brightness of the second pixel, wherein the function is a predetermined correction function according to which the influence of the brightness of the second pixel on the brightness of the first pixel due to fringe field effects between the first pixel and the second pixel is corrected. This method provides for the advantage that a more realistic image can be displayed.01-14-2010
20090021463Display Panel Driving Apparatus, Display Apparatus, Display Panel Driving Method, and Television Receiver - In one embodiment, a display panel driving apparatus which generates, based on an input gray scale, a gray scale of a first sub-frame and a gray scale of a second sub-frame so as to display the input gray scale as a result of a summation of respective display corresponding to the first sub-frame and the second sub-frame into which one frame is divided, and the gray scale of the second sub-frame being greater than the gray scale of the first sub-frame, for a response in which the input gray scale of a subsequent frame is greater than an input gray scale of a previous frame and the input gray scale of the subsequent frame is not less than a first threshold gray scale, a gray scale of the first sub-frame in the subsequent frame is set not more than a second threshold gray scale, regardless of input gray scale of the subsequent frame. Thus, it is possible to reduce jaggy in an edge of a moving image in time-division driving.01-22-2009
20090021462AMPLIFIER OFFSET CANCELING WITHIN DISPLAY PANEL DRIVER - A data driver used for driving a display panel is provided with a grayscale voltage generator circuit generating a plurality of grayscale voltages; and a drive circuitry selecting a selected grayscale voltage from the plurality of grayscale voltages in response to input display data, and outputting a data signal having a voltage level corresponding to the selected grayscale voltage to the display panel. The grayscale voltage generator circuit comprises an amplifier generating a voltage bias; and a voltage generator circuit generating the plurality of grayscale voltages from the voltage bias. The amplifier is designed so that a polarity of an offset voltage of the amplifier is reversible. The polarity of the offset voltage of the amplifier is controlled so that the polarity of the offset voltage of the amplifier used for driving a specific pixel of the display panel in a certain frame period is opposite to that of the offset voltage of the amplifier used for driving the c specific pixel in another frame period.01-22-2009
20080297457Liquid crystal display device and driving method thereof - A liquid crystal display (LCD) device and a driving method where the LCD device includes a data controller for interleaving one of black gray scale data and intermediate gray scale data into input digital video data to input digital video data in a specific period preceding a second one of two successive frame periods in which data voltages having the same polarity are successively supplied to liquid crystal cells. A timing signal controller generates a data timing signal and a gate timing signal, based on an input timing signal, and accelerates a frequency of the data timing signal and a frequency of the gate timing signal in the specific period. A data driving circuit is included for converting the interleaved digital video data into an analog voltage in response to the data timing signal, and supplying the analog voltage to data lines in the specific period.12-04-2008
20120319934ELECTRO-OPTICAL DEVICE, METHOD OF DRIVING THE SAME, AND ELECTRONIC APPARATUS - An electro-optical device includes a pixel that has an electro-optical element with a light transmittance that changes to a predetermined value in response to an applied voltage, which changes in response to the temperature. A light source irradiates light to the pixel. A driving unit includes a predetermined number of sub-fields having the same length in one frame. The driving unit provides either an on-voltage indicating light-on or an off-voltage indicating light-off to the pixel in each of the predetermined number of the sub-fields in response to the grayscale to be displayed. A temperature measuring unit measures the temperature and outputs a temperature signal. A time controlling unit controls the length of one sub-field on the basis of the temperature signal. A light intensity controlling unit controls the intensity of the light incident on the pixel on the basis of the temperature signal.12-20-2012
20110156994DISPLAY DEVICE - To provide a display device which can realize multi-gray scale display by reducing voltage fluctuation of a pixel, a display device includes a plurality of source signal lines, a plurality of gate signal lines which is provided so as to intersect with the source signal lines, and a pixel electrode to which a signal voltage of the source signal line is applied through a transistor including an oxide semiconductor, which is provided near an intersection portion of the source signal line and the gate signal line; in which in the pixel electrode which is provided between a pair of the adjacent source signal lines, edge portions thereof overlap with edge portions of the source signal lines and an overlapped area with one of the source signal lines is substantially equal to an overlapped area with the other source signal line.06-30-2011
20130021229DISPLAY DRIVER - An apparatus is provided, which includes a driving circuit. The driving circuit includes a gamma reference source and a liquid crystal display (LCD) source driver circuit. A first resistor string is provided. A plurality of digital-to-analog converters (DACs) are provided, where each DAC is coupled to the first resistor string. An output circuit having a second resistor string is provided so as to output a plurality of reference voltages. The LCD source driver circuit is coupled to the output circuit of the gamma reference source. The source driver is configured to receive the plurality of reference voltages, wherein the plurality of reference voltages are arranged in a first sequence during a positive polarity cycle and are arranged in a second sequence during a negative polarity cycle. The fifth sequence is an inverse of the fourth sequence.01-24-2013
20080231575Liquid crystal panel and method for driving same - An exemplary liquid crystal panel (09-25-2008
20080224977METHOD AND APPARATUS FOR DRIVING LIQUID CRYSTAL DISPLAY DEVICE - An apparatus for driving a liquid crystal display includes a picture quality improving unit that extracts a brightness component from first data, analyzes the brightness using the extracted brightness component, and generates second data having a contrast in accordance with the analyzed brightness. The contrast of the second data is extended from that of the first data. A timing controller rearranges the second data to supply the second data to a data driver. A backlight supplies the light to a liquid crystal panel in accordance with a driving current. An inverter supplies the driving current to the backlight.09-18-2008
20080224976Method and apparatus for temporally/spatially randomly dithering and liquid crystal display using the same - A method of temporally and/or spatially randomly dithering, to facilitate converting an input M-bit subpixel signal into an (M−N)-bit subpixel signal, may include spatially and/or temporally randomly generating a dithering mask pattern satisfying a condition that a spatial mean and/or a temporal mean of an image signal before dithering matches a spatial mean and/or a temporal mean of the image signal after dithering, respectively, and converting the M-bit subpixel signal into the (M−N)-bit subpixel signal using the dithering mask pattern.09-18-2008
20080224975DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME - A method for driving a display device includes: dividing an entire gray-scale region corresponding to a data gray scale into a first gray-scale region and a second gray-scale region and setting a first gamma value of the first gray-scale region and a second gamma value of the second gray-scale region, the first gamma value being smaller than the second gamma value; providing a first gray-scale display voltage corresponding to the data gray scale to a display panel during a first section of one horizontal period by using the first gamma value or the second gamma value selected by an inputted data gray scale; and providing a second gray-scale display voltage corresponding to a black gray scale to the display panel during a second section of the one horizontal period.09-18-2008
20080218464DEVICE CONTROL APPARATUS AND IMAGE DISPLAY APPARATUS - A device control apparatus that controls an image display device including a plurality of main scan lines is disclosed. The apparatus includes: a cumulative correction value calculation section that calculates, in response to an input image signal, a cumulative correction value in accordance with a cumulative value of each gray-scale value of input image data provided for each of the main scan lines; a cumulative correction value storage section that stores the calculated cumulative correction value for each of the main scan lines; and a device control section that controls, based on N (where N is an integer of 2 or larger) of the main scan lines read from the cumulative correction value storage section, the image display device to suppress a gray-scale deviation resulted from display of the N of the main scan lines.09-11-2008
20080218462Method for driving electro-optic device, electro-optic device, and electronic apparatus - A method for diving an electro-optic device including a pair of substrates sandwiching an electro-optic layer, and first and second electrodes disposed on one of the pair of substrates, the first electrode being used to drive the electro-optic layer, the second electrode being disposed closer to the electro-optic layer than the first electrode. The method involves shifting one of signal potentials each of which is input to at least one of the first and second electrodes such that a potential difference between the first and second electrodes in a case where the signal potential input to the first electrode is higher than the signal potential input to the second electrode is larger than a potential difference between the first and second electrodes in a case where the signal potential input to the first electrode is lower than the signal potential input to the second electrode, when a gray-scale level defined by white luminance in the case where the signal potential input to the first electrode is higher than the signal potential input to the second electrode is equivalent to the gray-scale level in the case where the signal potential input to the first electrode is lower than the signal potential input to the second electrode.09-11-2008
20130113694METHOD AND APPARATUS FOR ADAPTIVE BLACK FRAME INSERTION - In some embodiments, a display device may include a flat panel display a controller coupled to the flat panel display. The controller may be configured to determine an operating mode for the flat panel display among a plurality of operating modes including at least a first operating mode and a second operating mode. In the first operating mode, the controller may set the flat panel display to utilize a first frame rate and a first inversion mode to save power. In the second operating mode, the controller may set the flat panel display to utilize a second frame rate, a second inversion mode, and black frame insertion to improve image quality. The second frame rate may be faster than the first frame rate. The second inversion mode and black frame insertion may be mutually configured to maintain a DC balanced operation of the flat panel display. Other embodiments are disclosed and claimed.05-09-2013
20080211758LIQUID CRYSTAL DISPLAY HAVING GRAY VOLTAGES AND DRIVING APPARATUS AND METHOD THEREOF - An apparatus of driving a liquid crystal display (LCD) includes a gray voltage generator generating a range of gray voltages that correspond to different LC light transmittance levels. These gray voltages, along with image data, are fed into a data driver. The data driver converts the gray voltages to a data voltage that properly generates the image indicated by the image data. The gray voltage values are chosen from a wider range of values than the pixel voltages, and this conversion may include determining a conversion factor based on the relative range sizes. This conversion may also include calculating the voltage difference between the previous data and the current data and adjusting the data voltage according to the magnitude of this difference. Generally, the larger the voltage difference, the larger is the data voltage magnitude that is needed to bring the pixel voltage to the target voltage within limited time.09-04-2008
20080198118DRIVING CIRCUIT FOR DISPLAY PANEL HAVING USER SELECTABLE VIEWING ANGLE, DISPLAY HAVING THE SAME, AND METHOD FOR DRIVING THE DISPLAY - A driving circuit for a display panel comprising a driving voltage generator for outputting a plurality of gamma reference voltages, and a gray scale voltage generating unit for selecting one out of the plurality of gamma reference voltages and generating a gray scale voltage based on the selected gamma reference voltage, a liquid crystal display having the driving circuit, and a method for driving the liquid crystal display. A gamma reference voltage is dynamically changed depending on a user's selection, so that a gray scale voltage is changed, thereby varying the gamma characteristic and the viewing angle of an output image. Accordingly, a user can actively control the gamma characteristic and the viewing angle of an output image to be suitable for a user's preference and environment.08-21-2008
20080198117Display Device, Liquid Crystal Monitor, Liquid Crystal Television Receiver, and Display Method - In the present display device, a control section (08-21-2008
20080198116LIQUID CRYSTAL DISPLAY DEVICE AND METHOD OF DRIVING THE SAME - A liquid crystal display device includes a timing controller, a data driver, a gate driver and a liquid crystal panel. The timing controller receives an image data signal to output a first control signal, a second control signal and a data signal corresponding to the image data signal. The data driver outputs first and second gray scale signals having different gray scale levels in response to the first control signal and the data signal. The gate driver outputs a gate signal in response to the second control signal. The liquid crystal panel includes a plurality of pixels aligned in a matrix and displays an image in response to the first gray scale signal, the second gray scale signal and the gate signal. Each of the pixels of the liquid crystal panel includes a first sub-pixel, to which the first and second gray scale signals are alternately applied in one frame unit, and a second sub-pixel, to which the first gray scale signal is applied.08-21-2008
20080198115Liquid Crystal Display Overdrive Accuracy Adjustment Device And Method - An overdrive accuracy adjustment device and method for use in liquid crystal display panel is presented. According to a current grayscale value of a pixel in an awaiting to be displayed image and a previous grayscale value of the corresponding pixel in an already-displayed image, the corresponding overdrive grayscale value is found from the look-up table. In order to more efficiently use the limited storage capacity of the look-up table as well as improving the accuracy of the overdrive, in accordance to the physical characteristics of the liquid crystal display panel in particular (in particular to the grayscale values which often required the overdrive), the gap size between the current grayscale values and/or the previous grayscale values with each other should be adjusted in the look-up table, without having to increase the quantity of the overdrive grayscale values stored in the look-up table.08-21-2008
20120274543LIQUID CRYSTAL DISPLAY DEVICE, TELEVISION RECEIVER, AND DISPLAY METHOD FOR LIQUID CRYSTAL DISPLAY DEVICE - Provided is a liquid crystal display device which displays each halftone by changing the luminance of pixels during a cycle (F11-01-2012

Patent applications in class Gray scale capability (e.g., halftone)