Class / Patent application number | Description | Number of patent applications / Date published |
345078000 | Having compensating pulse | 38 |
20090135114 | ELECTROLUMINESCENT DISPLAY WITH INTERLEAVED 3T1C COMPENSATION - A method of compensating for changes in the characteristics of transistors and EL devices in an EL display, includes providing an EL display having a two-dimensional array of EL devices arranged in rows and columns, wherein each EL device is driven by a drive circuit in response to a drive signal; providing a first drive circuit for an EL device having three transistors and providing a second drive circuit for an EL device having only two transistors, and wherein a first column in the display includes at least one first drive circuit and an adjacent second column includes at least one second drive circuit; deriving a correction signal based on the characteristics of a transistor in a first drive circuit, or the EL device; and using the correction signal to adjust the drive signals applied to the first drive circuit and one or more adjacent second drive circuits. | 05-28-2009 |
20090174631 | Semiconductor Device and Driving Method Thereof - A semiconductor device in which a signal current can be written quickly in a current source circuit of a current input type. A signal current is written after performing a pre-charge operation, thus the writing is performed quickly. In the pre-charge operation, a current is supplied to a plurality of circuits. The current size is set according to the number of the circuits to be supplied the current, which means the steady state can be obtained quickly. Note that a current may be supplied to a circuit other than the one to be input a signal in the pre-charge operation. | 07-09-2009 |
20100156766 | DIGITAL-DRIVE ELECTROLUMINESCENT DISPLAY WITH AGING COMPENSATION - An electroluminescent (EL) subpixel driven by a digital-drive scheme has a readout transistor driven by a current source when the drive transistor is non-conducting. This produces an emitter-voltage signal from which an aging signal representing the efficiency of the EL emitter can be computed. The aging signal is used to determine the loss in current of the subpixel when active, and an input signal is adjusted to provide increased on-time to compensate for voltage rise and efficiency loss of the EL emitter. Variations due to temperature can also be compensated for. | 06-24-2010 |
20130009854 | PIXEL CIRCUIT, DISPLAY DEVICE, DRIVING METHOD OF PIXEL CIRCUIT, AND DRIVING METHOD OF DISPLAY DEVICE - A display device including pixel circuits arranged in a form of a matrix, with the pixel circuits respectively including an electro-optical element, a drive transistor, a sampling transistor, and a capacitive element. The sampling transistor samples a signal from the signal line in the capacitive element. The drive transistor and the electro-optical element are arranged in series to form a current path between a power supply line and a ground line. The drive transistor is configured to control a driving current through the current path according to a signal potential stored in the capacitive element. Compensation for driving current dependence on a characteristic of the drive transistor is provided, with such compensation being based upon a current through the current path occurring before a light emission period. | 01-10-2013 |
20140361964 | PIXEL DRIVING METHOD OF A DISPLAY PANEL AND DISPLAY PANEL THEREOF - A pixel driving method of a display panel is disclosed. The display panel includes a plurality of scan lines, data lines and pixels. Each of the pixel includes a first transistor with a first end coupled to the data line, and a gate end coupled to the scan line, a second transistor with a first end selectively coupled to a voltage source or current source, and a gate end coupled to a second end of the first transistor, and a light-emitting unit with a first end coupled to a second end of the second transistor. The method includes turning on the first transistors of the pixels; coupling the data lines and first ends of the second transistors to the current source; reading voltage levels of gate ends of the second transistors; and providing corresponding data voltages to the pixels according to voltage levels of gate ends of the second transistors. | 12-11-2014 |
20140368416 | OLED DISPLAY DEVICE - An OLED display device includes multiple pixel units arranged in a matrix and a power supply driver chip located at one side of the multiple pixel units. The power supply driver chip is configured to supply input voltages to the multiple pixel units. The power supply driver chip provides the input voltages to the multiple pixel units through a plurality of input paths. The input paths are associated with input points, each of the input points corresponds to a pixel unit at a different location. The power supply driver chip compensates the input voltages to ensure that all of the pixel units at different locations may have an approximately equal input voltage, enabling the entire display region of the OLED display device to display with a uniform brightness and improving the display performance. | 12-18-2014 |
20140375533 | ORGANIC LIGHT EMITTING DISPLAY DEVICE AND DRIVING METHOD THEREOF - An organic light emitting display including pixels, a scan driver, a data driver, a control line driver, and a compensation unit. The pixels are positioned in an area defined by data lines, scan lines, and control lines, and each includes an organic light emitting diode. The scan driver drives the scan lines. The data driver drives the data lines. The control line driver drives the control lines. The compensation unit extracts threshold voltage information of a driving transistor included in each pixel during a sensing period. In the organic light emitting display, the compensation unit supplies a preset voltage to a gate electrode of the driving transistor so that a second current flows during the sensing period, and supplies a reference voltage to a drain electrode of the driving transistor during the period in which the second current flows. | 12-25-2014 |
20150109189 | ORGANIC LIGHT-EMITTING DISPLAY APPARATUS - An organic light-emitting display apparatus includes: a plurality of emitting pixels coupled to a plurality of scan lines extending in a row direction and a plurality of data lines extending in a column direction; a plurality of dummy pixels arranged in the row direction; a plurality of first repair lines extending in the column direction, that are coupled to the plurality of dummy pixels, and that are adapted to be coupled to the plurality of emitting pixels; a plurality of second repair lines extending in the column direction, and that are coupled to the plurality of dummy pixels; and a plurality of repair switching devices arranged in a matrix array and adapted to be coupled to the plurality of scan lines and the plurality of second repair lines and adapted to be coupled to the plurality of data lines. | 04-23-2015 |
20150130690 | ORGANIC LIGHT EMITTING DISPLAY AND METHOD FOR DRIVING THE SAME - An organic light emitting display includes a power supply source and a power voltage compensation unit. The power supply source supplies at least a first power voltage to a first power voltage line of the display. The power voltage compensation unit to generate a first compensation power voltage based on the first power voltage and a feedback power voltage from the first power voltage line. The first power voltage compensation unit outputs the first compensation power voltage to the first power voltage line. | 05-14-2015 |
20150310806 | ORGANIC LIGHT EMITTING DISPLAY DEVICE, PIXEL CIRCUIT OF THE SAME AND DRIVING METHOD THEREOF - An organic light emitting display device, a pixel circuit of the organic light emitting display device and a method of driving the same are disclosed. The pixel circuit comprises a driving transistor, a first transistor, a second transistor, a third transistor, a fourth transistor, a first capacitor, a second capacitor, a light emitting diode and a compensating diode. The degradation of the light emitting diode is compensated by the compensating diode. Since the degradation phenomena of the light emitting diode is compensated by the compensating diode, the light emitting diode is able to maintain an effective and normal brightness while using the same driving voltage, thereby ensuring higher display quality of images and scenes of the organic light emitting display device. | 10-29-2015 |
20150317931 | PIXEL COMPENSATION CIRCUIT - A pixel compensation circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a switch unit and a light emitting diode. The first transistor, the third transistor, the fourth transistor, the fifth transistor, and the switch unit are used to receive a respective switch signal. The pixel compensation circuit can compensate a threshold voltage of transistor automatically; and consequentially a driving current of light emitting diode is prevented from being affected by the change of the threshold voltage or the voltage drop of the light emitting diode. | 11-05-2015 |
20150339977 | METHOD AND SYSTEM FOR PROGRAMMING, CALIBRATING AND/OR COMPENSATING, AND DRIVING AN LED DISPLAY - A method and system for programming, calibrating and driving a light emitting device display, and for operating a display at a constant luminance even as some of the pixels in the display are degraded over time. The system may include extracting a time dependent parameter of a pixel for calibration. Each pixel in the display is configured to emit light when a voltage is supplied to the pixel's driving circuit, which causes a current to flow through a light emitting element. Degraded pixels are compensated by supplying their respective driving circuits with greater voltages. The display data is scaled by a compression factor less than one to reserve some voltage levels for compensating degraded pixels. As pixels become more degraded, and require additional compensation, the compression factor is decreased to reserve additional voltage levels for use in compensation. | 11-26-2015 |
20150339978 | OLED LUMINANCE DEGRADATION COMPENSATION - A system and method are disclosed for determining a pixel capacitance. The pixel capacitance is correlated to a pixel age to determine a current correction factor used for compensating the pixel drive current to account for luminance degradation of the pixel that results from the pixel aging. | 11-26-2015 |
20150348462 | COMPENSATION PIXEL CIRCUIT AND DISPLAY APPARATUS - There are provided a compensation pixel circuit and a display apparatus. The compensation pixel circuit comprises an organic light emitting diode (D | 12-03-2015 |
20150356916 | ORGANIC LIGHT EMITTING DIODE PIXEL COMPENSATION CIRCUIT, DISPLAY PANEL AND DISPLAY DEVICE - An organic light emitting diode pixel compensation circuit is disclosed. The compensation circuit compensates threshold voltage of a TFT and supply voltage in a pixel circuit to address non-uniform in a display. In the circuit, a first transistor transmits a data signal to a first capacitor based on a scan signal; a second transistor transmits a reference signal to the first capacitor based on a first light emission signal; a third transistor connects a gate of a drive transistor with a drain of the drive transistor based on the scan signal to read the difference between supply voltage and threshold voltage of the drive transistor and to transmit the difference to the first capacitor and a second capacitor; and the drive transistor generates the drive current based on the supply voltage and the voltage on the first capacitor to drive an organic light emitting diode emit light. | 12-10-2015 |
20150364087 | ORGANIC LIGHT EMITTING DIODE PIXEL DRIVING CIRCUIT AND DISPLAY DEVICE - An organic light emitting diode pixel driving circuit includes an external circuit and multiple intra-pixel circuits. Each of the intra-pixel circuits includes a signal loading module, a driving transistor and an organic light emitting diode. Each of the signal loading modules is configured to store an image data signal and the threshold voltage of the driving transistor as a drive signal and load the drive signal to the gate of the driving transistor in a signal loading phase, and to control the driving transistor by the drive signal stored in the signal loading phase and a signal at a source of the driving transistor to drive the organic light emitting diode to emit light in a light emitting phase. The external circuit is configured to load a first power supply signal to the source of the driving transistor in the light emitting phase. | 12-17-2015 |
20150364090 | ORGANIC LIGHT EMITTING DISPLAY AND METHOD OF DRIVING THE SAME - An organic light emitting display includes pixels located at a region defined by scan lines and data lines, i blocks, each of the i blocks including two or more scan lines wherein i is a natural number that is 2 or greater, a control driver configured to supply a first control signal to i first control lines and a second control signal to i second control lines, each of the first and second control lines being in a corresponding one of the blocks, a scan driver configured to supply a scan signal to the scan lines and a data driver configured to supply a data signal to the data lines, wherein the scan driver is configured to supply the scan signals to the scan lines in different directions in adjacent ones of the blocks. | 12-17-2015 |
20150371586 | ORGANIC LIGHT EMITTING DIODE PIXEL COMPENSATION CIRCUIT, AND DISPLAY PANEL AND DISPLAY DEVICE CONTAINING THE SAME - An Organic Light Emitting Diode pixel compensation circuit is disclosed. The circuit includes first through fifth transistors, and a storage capacitor. The first transistor is coupled to a first scan signal, a power supply voltage, and a first electrode of the storage capacitor. In addition, the second transistor is coupled to the first scan signal, a data signal, and the third transistor. The third transistor is coupled to the power supply voltage, and the fifth transistor. Furthermore, the fourth transistor is coupled to a second scan signal, the third transistor, and the storage capacitor, and fifth transistor is coupled to a light emitting signal, and the OLED. In addition, the storage capacitor is coupled to the fifth transistor, and a low-level signal and emits light based on a drive current generated by the third transistor. | 12-24-2015 |
20150379929 | PIXEL CIRCUIT, ORGANIC ELECTROLUMINESCENT DISPLAY PANEL AND DISPLAY DEVICE - A pixel circuit is disclosed. The pixel circuit includes first and second capacitors, and a driving transistor, which generates a driving current. The pixel circuit includes a first transistor, controlled by a first driving signal, and which transmits a data signal to the first capacitor. The pixel circuit includes a second transistor, controlled by a second driving signal, and which transmits the data signal to the driving transistor. The pixel circuit includes a third transistor, controlled by the first driving signal, and which transmits a reference signal to the driving transistor. The pixel circuit includes a fourth transistor, controlled by a third driving signal, and which transmits the driving current to the light emitting element. The first capacitor stores the data signal and stabilizes the voltage between the gate and the source of the driving transistor, and the second capacitor stabilizes a source voltage of the driving transistor. | 12-31-2015 |
20160005357 | DISPLAY PANEL - A display panel includes a gate line extending in a column direction, a data line extending in a row direction, a pixel including a switching transistor connected to the gate line and the data line, and a voltage applier connected to a gate line of a present stage. The voltage applier to apply a voltage after conversion of the gate-on voltage to a gate-off voltage has started. The voltage is closer to the gate-on voltage than the gate-off voltage. | 01-07-2016 |
20160035276 | OLED PIXEL CIRCUIT, DRIVING METHOD OF THE SAME, AND DISPLAY DEVICE - An OLED pixel circuit includes a data storage and threshold compensation module, a switch module, a driving module, and a light-emitting module. The data storage and threshold compensation module is connected to the driving module, the switch module, a scanning signal line, and a data signal line, respectively, and is used for inputting a data signal on the data signal line to the driving module and compensating a threshold voltage of the driving module according to a scanning signal of the scanning signal line. The switch module is connected to the driving module, the light-emitting module, and a light emission control signal line, respectively, and is used for inputting the data signal provided by the threshold-compensated driving module to the light-emitting module according to a control signal of the light emission control signal line, so that the light-emitting module is driven to emit light. | 02-04-2016 |
20160042694 | PIXEL CIRCUIT AND ORGANIC LIGHT-EMITTING DIODE DISPLAY INCLUDING THE SAME - A pixel circuit and an OLED display including the same are disclosed. The pixel circuit includes a driving transistor having a double gate structure, the driving transistor including a first gate electrode electrically connected to a first node, a second gate electrode electrically connected to a second node, a first electrode electrically connected to a first power supply voltage, and a second electrode electrically connected to the anode of the OLED. The pixel circuit also includes a switching transistor including a gate electrode configured to receive a scan signal, a first electrode configured to receive a data voltage, and a second electrode electrically connected to the first node. The pixel circuit further includes a storage capacitor and a compensation capacitor including a first electrode electrically connected to the second node and a second electrode electrically connected to the first electrode of the driving transistor. | 02-11-2016 |
20160078805 | ORGANIC LIGHT EMITTING DIODE DISPLAY FOR SENSING ELECTRICAL CHARACTERISTIC OF DRIVING ELEMENT - An organic light emitting diode display is disclosed. The organic light emitting diode display includes a display panel including a plurality of pixels, a plurality of sensing units configured to integrate current information of the pixels through a plurality of sensing channels connected to sensing lines of the display panel and output a first sensing value, a reference sensing unit configured to integrate previously set reference current information and output a reference sensing value, a calculation block configured to calculate the first sensing value and the reference sensing value, remove a common noise component from the first sensing value, and output a second sensing value, and an analog-to-digital converter configured to convert the second sensing value into a digital sensing value. | 03-17-2016 |
20160078809 | ORGANIC LIGHT-EMITTING DISPLAY APPARATUS - An organic light-emitting display apparatus is provided. The apparatus includes an organic light-emitting diode emitting visible light, a driving thin film transistor driving the organic light-emitting diode, and a compensation thin film transistor. The compensation thin film transistor includes a compensation gate electrode, a compensation semiconductor layer, a compensation source electrode, and a compensation drain electrode. The compensation gate electrode includes a first gate electrode, and a second gate electrode electrically connected to the first gate electrode. The compensation drain electrode is electrically connected to the driving gate electrode of the driving thin film transistor. The compensation semiconductor layer includes a first semiconductor region overlapping the first gate electrode and a second semiconductor region overlapping the second gate electrode and disposed further from the compensation drain electrode than the first semiconductor region, and an area of the first semiconductor region is less than that of the second semiconductor region. | 03-17-2016 |
20160078811 | ORGANIC LIGHT EMITTING DISPLAY DEVICE - An organic light emitting display device includes display pixels, auxiliary pixels, and a plurality of signal lines. The signal lines include data lines, auxiliary data lines, scan lines, and emission control lines. The auxiliary pixels are to be used for repairing defective ones of the display pixels. In operation, scan signals are supplied in a unit of p scan lines, A emission control signals are to be supplied in a unit of p A emission control lines, and B emission control signals are to be supplied in a unit of p B emission control lines, where p≧2. | 03-17-2016 |
20160098957 | ORGANIC LIGHT-EMITTING DIODE (OLED) DISPLAY AND METHOD OF DRIVING THE SAME - An organic light-emitting diode (OLED) display and a method of driving the same are disclosed. In one aspect, the OLED display includes a display panel including a plurality of pixels and a plurality of sensing regions. The OLED display further includes a temperature sensor array comprising a plurality of temperature sensors respectively arranged on the sensing regions. The OLED display also includes a controller configured to output a plurality of control signals so as to sequentially select the temperature sensors, receive a plurality of output signals output from the temperature sensors selected by the control signals, and generate first temperature data corresponding to the locations of the selected temperature sensors based on the output signals. | 04-07-2016 |
20160098958 | DISPLAY DEVICE - A display device is disclosed. The device includes a display panel including a plurality of pixels including a first pixel electrically connected to a first data line and a second pixel electrically connected to a second data line. The display device also includes a current path switch configured to electrically connect the first pixel to the second pixel during a voltage drop test operation and electrically disconnect the first pixel from the second pixel during an image display operation. The display device further includes a voltage drop detector electrically connected to an end of the first data line and an end of the second data line, the voltage drop detector being configured to apply a test voltage to the end of the first data line and measure a dropped test voltage at the end of the second data line. The display device additionally includes a line resistance calculator. | 04-07-2016 |
20160104419 | ORGANIC LIGHT EMITTING DISPLAY AND METHOD FOR DRIVING THE SAME - A pixel of an organic light emitting display includes first through fourth transistors and a capacitor. The first transistor operates based on a scan signal and is connected between a data line and a first node. The capacitor is connected between the first node and a second node. The second transistor operates based on a gate signal and is connected between a first power voltage and a third node. The third transistor operates based on compensation control line signal and is connected between the second node and the third node. The fourth transistor operates based on sensing control line signal and is connected between the data line and the third node. The organic light emitting element is connected between the third node and a second power voltage. | 04-14-2016 |
20160104423 | DISPLAY DEVICE - A display device includes a plurality of pixels and a compensation power supply line. The pixels are located at intersections of data lines and gate lines. The compensation power supply line is separated from the data lines. Each of the pixels includes an in-pixel circuit and at least one out-pixel circuit. The in-pixel circuit includes a first transistor, to be controlled based on a data voltage from a corresponding one of the data lines, and a storage capacitor connecting the first transistor and a first node. The at least one out-pixel circuit receives a compensation voltage from the compensation power supply line and provides the compensation voltage to the first node. | 04-14-2016 |
20160104431 | ORGANIC LIGHT EMITTING DISPLAY DEVICE - An organic light emitting display device including data lines, an auxiliary data line, and a compensation data line, a display area including display pixels connected to the data lines, a nondisplay area including auxiliary pixels connected to the auxiliary data line, and compensation pixels connected to the compensation data line, and auxiliary lines connected to the auxiliary pixels and the compensation pixels. | 04-14-2016 |
20160117980 | EXTERNAL COMPENSATION SENSING CIRCUIT AND SENSING METHOD THEREOF, DISPLAY DEVICE - An external-compensation sensing circuit, sensing method, and display device. The circuit includes fully-differential operational amplifier, first capacitor, second capacitor and outputting circuit for amplifying induced current; negative input of the amplifier is connected to display screen, positive input thereof is connected to reference voltage, negative output thereof is connected to first control terminal of the outputting circuit, positive output thereof is connected to second control terminal of the outputting circuit; two terminals of the first capacitor are connected to the negative input of the amplifier and an input of the outputting circuit respectively; one terminal of the second capacitor is connected to the output of the outputting circuit and the other terminal is grounded. The invention enables the output voltage to respond rapidly by amplifying induced current with dual outputting stages in the sensing circuit to raise the speed of the external-compensation. | 04-28-2016 |
20160117991 | Data Driver and Organic Light Emitting Diode Display Device Using The Same - A data driver and a display device using the same are disclosed. The data driver includes a digital to analog conversion unit for converting a digital signal into either a positive polarity analog signal or a negative polarity analog signal, and an output circuit unit for outputting either the positive polarity analog signal or the negative polarity analog signal, as an output signal, to a transistor that supplies a current to an organic light emitting diode (OLED). | 04-28-2016 |
20160125801 | ORGANIC LIGHT-EMITTING DISPLAY APPARATUS AND METHOD OF DRIVING THE SAME - An organic light-emitting display apparatus includes a plurality of color pixels. Each of the color pixels includes an organic light-emitting diode (OLED), a driving transistor to control current to the OLED, and a compensation transistor connected between an anode electrode of the OLED and a gate electrode of the driving transistor. The compensation transistor turns on based on a compensation control signal. The compensation control signals for different color pixels have different on-times. | 05-05-2016 |
20160140902 | ORGANIC LIGHT-EMITTING DISPLAY AND METHOD OF DRIVING THE SAME - An organic light-emitting display comprises a first transistor comprising a gate electrode connected to a scan line, a first electrode connected to a data line, and a second electrode connected to a first node, a second transistor comprising a gate electrode connected to the first node, a first electrode connected to a first power supply voltage, and a second electrode connected to a third node, a third transistor comprising a gate electrode connected to a sensing control line, a first electrode connected to the data line, and a second electrode connected to the third node and an organic light-emitting device comprising an anode connected to the third node and a cathode connected to a second power supply voltage, wherein the first power supply voltage is set to a level of a sensing voltage for a period of time during which the sensing voltage is provided to the data line. | 05-19-2016 |
20160140904 | PIXEL CIRCUIT OF ORGANIC LIGHT-EMITTING DISPLAY AND METHOD OF DRIVING THE SAME, AND ORGANIC LIGHT-EMITTING DISPLAY - A pixel circuit of an organic light-emitting display and a method of driving the same, and an organic light-emitting display are disclosed. The pixel circuit includes at least a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a first capacitor, and a light-emitting diode. The pixel circuit and the method for driving the same enable a gate voltage and a source voltage of the first thin film transistor to be coupled and maintained in a control signal write phase and also compensate for a threshold voltage drift of the first thin film transistor so as to address the problem in prior art of non-uniform light emission by the OLED due to the threshold voltage drift of the drive transistor or the instable voltage across the gate and the source of the drive transistor. | 05-19-2016 |
20160148575 | PIXEL UNIT STRUCTURE OF ORGANIC LIGHT EMITTING DIODE DISPLAY PANEL AND DRIVING MECHANISM THEREOF - A pixel unit structure of an organic light emitting diode display panel includes a switch transistor, a storage capacitor configured to receive a discharging reference voltage, an organic light emitting diode, a driving transistor, a first control circuit, and a second control circuit. The organic light emitting diode is controlled by the driving transistor and the first control circuit to emit light. The scan signal, the first control signal, the second control signal, and the discharging reference voltage control the pixel unit to operate in a plurality of time events repeating in sequence. | 05-26-2016 |
20160155380 | ORGANIC LIGHT-EMITTING DISPLAY DEVICE AND METHOD OF DRIVING THE SAME | 06-02-2016 |
20160189627 | ORGANIC LIGHT EMITTING DISPLAY - An organic light emitting display including a display panel having pixels coupled to data lines and first power voltage lines. Each of the pixels includes an organic light emitting diode; a driving transistor coupled to the organic light emitting diode and the first power voltage lines; a first transistor coupled to the data lines and a gate electrode of the driving transistor; a second transistor configured to supply a reference voltage of the data lines to a source electrode of the driving transistor; and a capacitor coupled to the gate and source electrodes of the driving transistor. | 06-30-2016 |