Patent application number | Description | Published |
20080284717 | ELECTRO-OPTICAL DEVICE, METHOD FOR DRIVING THE SAME, AND ELECTRONIC MACHINE - An electro-optical device includes a liquid crystal drive unit that divides on a temporal axis one field into subfields and that, during the subfields, applies either an on-voltage or an off-voltage to picture elements of a liquid crystal display in accordance with gradation of the picture elements during the one field. A light source control unit sequentially switches the three light sources, and switches at least two of the three light sources at a switching period that is shorter than a time duration required to exhibit, in the picture elements during the one field, gradation of each color corresponding to each of the at least two of the three light sources. | 11-20-2008 |
20090015525 | ELECTRO-OPTICAL DEVICE, METHOD OF CONTROLLING THE SAME AND ELECTRONIC APPARATUS - Light having a color component that corresponds to a present field is irradiated on a plurality of pixels for a time duration that starts during the scan period of the present field and that ends during the scan period of a next field that is subsequent to the present field. The light is irradiates so that the light having the color component that corresponds to the present field is not mixed with light having a color component that corresponds to a previous field that is previous to the present field and with light having a color component that corresponds to the next field | 01-15-2009 |
20090189845 | IMAGE DISPLAY DEVICE AND ELECTRONIC APPARATUS - An image display device includes at least one light source that emits light; at least one display area that changes, for each pixel, a transmittance or a reflectance of the light emitted from the light source; a panel driving circuit that drives the display area on the basis of an image signal indicating the transmittance or the reflectance for each pixel; and a light source control unit that controls a proportion of a light emission time of the light source in a period that varies within a predetermined range. | 07-30-2009 |
20090189922 | IMAGE DISPLAY APPARATUS, METHOD FOR CONTROLLING THE SAME, AND ELECTRONIC DEVICE - An image display apparatus includes a light-source driving circuit that drives a light source to cyclically change brightness. A control unit controls a pixel to turn on and off over a plurality of subfields in a field so that transmittance or reflectance in the pixel over the plurality of subfields in the field corresponds to a gray level specified for the pixel. The control unit also arranges the plurality of subfields such that two or more gray-level defining subfields maintain a predetermined relationship with respect to the cyclical change in brightness of the light source caused by drive of a light-source driving circuit. | 07-30-2009 |
20100073341 | ELECTRO-OPTICAL DEVICE, DRIVING METHOD THEREOF, AND ELECTRONIC APPARATUS - An electro-optical device includes a display panel having a switching transistor and a pixel electrode that are disposed in correspondence with an intersection of a scanning line and a data line, an opposing electrode that faces the pixel electrode, and an electro-optical layer that is pinched between the pixel electrode and the opposing electrode, a detection unit that detects a current flowing through the electro-optical layer, and a control unit wherein, when a voltage of a high electric potential is defined to have the positive-polarity and a voltage of a low electric potential is defined to have the negative polarity with reference to the opposing electrode electric potential applied to the opposing electrode as a reference, a data signal of the positive polarity and a data signal of the negative polarity are alternately supplied to the pixel electrode through the data line. | 03-25-2010 |
20100079441 | ELECTRO-OPTICAL DEVICE, DRIVING METHOD THEREOF, AND ELECTRONIC APPARATUS - A method of driving an electro-optical device having scanning lines, data lines, a switching transistor and a pixel electrode. The device also has an electro-optical layer interposed between the pixel electrode and a counter electrode. The method includes: supplying a data signal alternate between a positive and a negative voltage to the pixel electrode. The positive voltage has a potential greater than a counter electrode potential applied to the counter electrode and the negative voltage is a potential lower than the counter electrode potential; setting the counter electrode potential to reduce a flicker; supplying a first voltage that is either the positive or negative voltage to the pixel electrode in a first period; the other voltage to the pixel electrode in a second period. A ratio of the first period to the second period is variable. | 04-01-2010 |
20100201654 | ELECTRO-OPTICAL APPARATUS, METHOD OF DRIVING THE SAME, AND ELECTRONIC DEVICE - A method of driving an electro-optical apparatus includes segmenting a time width of a field into a plurality of subfields, the subfields within the field having different widths; and expressing a desired gradation level using a plurality of the subfields by applying an ON level for setting a pixel to an ON state or an OFF level for setting the pixel to an OFF state to the pixel in each subfield, wherein response characteristic data representing response characteristics of the pixel are obtained, and a width of the subfield for setting the pixel to the ON or OFF state is lengthened when the response characteristic data indicate that a response of the pixel is delayed. | 08-12-2010 |
20100214271 | LIQUID CRYSTAL DEVICE, TEMPERATURE DETECTION METHOD, AND ELECTRONIC APPARATUS - A liquid crystal device including a pair of substrates that are provided opposite to each other with a liquid crystal layer being disposed therebetween, a pair of electrodes provided for each intersection of a plurality of scanning lines and a plurality of data lines, the pair of electrodes driving the liquid crystal layer, a driving circuit that applies a driving voltage to the pair of electrodes, an electric current detection element that detects a value corresponding to an electric current that flows in the liquid crystal layer when the driving voltage is applied, and a temperature information output circuit that outputs temperature information of the liquid crystal layer based on the value corresponding to the electric current. | 08-26-2010 |
20100231560 | ELECTRO-OPTICAL APPARATUS, ELECTRONIC DEVICE, AND DRIVING METHOD FOR THE ELECTRO-OPTICAL APPARATUS - An electrophoretic display apparatus, electronic device, and driving method for an electrophoretic display apparatus are capable of significantly increasing the number of tones that can be expressed in a single frame period. The electrophoretic display apparatus divides at least part of a frame period into multiple subfield periods and controls the light transmission of an electro-optical layer by selecting, on a subfield period-by-subfield period basis, an on or off voltage as the driving voltage to apply between a pixel electrode and an opposing electrode to display multiple tones. A driving circuit of the electrophoretic display apparatus determines, in accordance with the tone to be displayed, the ratio between the application periods of the on and off voltages during the frame period, and the arrangement of the on and off voltages. The absolute values of the positive-polarity and negative-polarity voltages are different from each other. | 09-16-2010 |
20100309189 | LIQUID CRYSTAL DISPLAY, CONTROL METHOD THEREOF AND ELECTRONIC DEVICE - A liquid crystal display, applying to the first electrode, a voltage higher and a voltage lower at different timings, detecting a current flowing through the second electrode, designating, as a reference value, the current flowing through the second electrode when the voltage maintained in the liquid crystal element is reset, specifying a first current which is obtained by excluding a charging current due to application of a related higher voltage from currents flowing through the second electrode after the higher voltage is applied to the first electrode, and a second current which is obtained by excluding a charging current due to application of a related lower voltage from currents flowing through the second electrode after the lower voltage is applied to the first electrode, and comparing the first current with the second current, and controlling the first current and the second current based on the comparison result. | 12-09-2010 |
20110176080 | ELECTRO-OPTIC DEVICE AND ELECTRONIC APPARATUS - An electro-optic device including: a plurality of pixels disposed corresponding to a plurality of colors; and a drive circuit adapted to drive the pixels, wherein the drive circuit drives the pixels based on a drive voltage set for each of the colors in accordance with a mixture ratio between the colors, and a drive pattern provided in accordance with the drive voltage and adapted to designate one of switching ON and OFF of the pixels at each of sub-fields constituting a frame in accordance with a grayscale level, and the drive voltages are set so that a voltage range of the drive voltage is different between the pixel corresponding to at least one of the colors and the pixel corresponding to another of the colors, the colors having respective proportions of mixture different from each other. | 07-21-2011 |
20120099084 | LIGHT SOURCE CONTROL DEVICE, PROJECTOR, AND LIGHT SOURCE CONTROL METHOD - A light source control device and a light source control method each capable of preventing the scroll noise from occurring without being affected by the characteristics of a light modulation device, and a projector equipped with the light source control device are provided. The light source device includes a duty determination section adapted to determine a duty ratio, and a drive control section adapted to perform drive control of a plurality of solid-state light sources by generating a PWM signal having the duty ratio determined by the duty ratio determination section, and adapted to make a phase with which at least one of the solid-state light sources is driven different from a phase with which another of the solid-state light sources is driven. | 04-26-2012 |
20120134020 | IMAGE DISPLAY APPARATUS, IMAGE DISPLAY SYSTEM, AND IMAGE DISPLAY METHOD - An image display apparatus includes a light source controlled to be turned on and off, a spatial light modulator that modulates light from the light source, and a controller that alternately switches an image to be displayed between an image for the left eye and an image for the right eye and turns on the light source so that the image for the left eye or the image for the right eye is displayed. When the image for the left eye is displayed, the controller starts opens a shutter for the left eye in eyeglasses before turning on the light source, whereas when the image for the right eye is displayed, the controller starts opening a shutter for the right eye in the eyeglasses before turning on the light source. | 05-31-2012 |
20120262501 | ELECTROOPTICAL DEVICE - An electrooptical device according to the invention includes a plurality of pixels and a driving section that drives the pixel in such a way that the pixel is brought into a bright state or a dark state in each of subfields, and, when a specific gray level is designated, the details of driving of at least one pixel and a pixel adjacent to the one pixel, the details of driving in one frame, are different from each other. | 10-18-2012 |
20130057808 | LIQUID CRYSTAL DEVICE, TEMPERATURE DETECTION METHOD, AND ELECTRONIC APPARATUS - A liquid crystal device including a pair of substrates that are provided opposite to each other with a liquid crystal layer being disposed therebetween, a pair of electrodes provided for each intersection of a plurality of scanning lines and a plurality of data lines, the pair of electrodes driving the liquid crystal layer, a driving circuit that applies a driving voltage to the pair of electrodes, an electric current detection element that detects a value corresponding to an electric current that flows in the liquid crystal layer when the driving voltage is applied, and a temperature information output circuit that outputs temperature information of the liquid crystal layer based on the value corresponding to the electric current. | 03-07-2013 |
20130069993 | ELECTRO-OPTIC DEVICE, ELECTRONIC APPARATUS, AND METHOD FOR DRIVING ELECTRO-OPTIC DEVICE - An electro-optic device has electro-optic elements; a storage units storing a first table including pairs of a gray-scale value and an a-bit sub-field code and a second table including pairs of a gray-scale value and a b-bit (b>a) sub-field code; a converting unit converting the gray-scale value of an object pixel into the sub-field code using the second table when a difference in gray-scale value between a first image and a second image is less than a threshold value, while converting the gray-scale value of the object pixel into the sub-field code using the first table when the difference in gray-scale value between the first image and the second image is the threshold value or more; and a driving unit supplying a signal corresponding to the sub-field code converted by the converting unit to drive the electro-optic elements. | 03-21-2013 |
20130093864 | ELECTRO-OPTIC DEVICE AND ELECTRONIC APPARATUS - An electro-optic device according an embodiment of the invention can increase the number of gray scales capable of being expressed. A liquid crystal panel is viewed via a blocking unit which blocks the field of view in a predetermined non-viewing period. A converting unit converts, based on a video signal, a gray-scale value input for each frame composed of a subfields into a subfield code indicating a combination of ON and OFF of b (2≦b≦a) subfields included in a viewing period other than the non-viewing period and c (1≦c≦b) subfields included in the non-viewing period. A driving unit drives a plurality of electro-optic elements each based on the converted subfield code. | 04-18-2013 |
20130107223 | PROJECTOR AND CONTROL METHOD THEREOF | 05-02-2013 |
20130229631 | PROJECTOR - A projector can prevent a flicker from being caused by rotation of a rotating phosphor plate. The projector includes a solid-state light source that emits excitation light, a rotating phosphor plate that converts the excitation light into phosphor light, a liquid-crystal light modulating device that modulates the light from the rotating phosphor plate, a projection optical system that projects the modulated light onto a screen, and a control device that controls the solid-state light source and the rotating phosphor plate so as to satisfy any one of a conditional expression A=B, a conditional expression A=2B, and a conditional expression |A−B| is greater than or equal to 20 and |A−2B| is greater than or equal to 20, where A represents a pulse width modulation control frequency in hertz of the solid-state light source and B represents a rotation frequency in hertz of the rotating phosphor plate. | 09-05-2013 |
20140062328 | DISPLAY DEVICE AND METHOD OF CONTROLLING LIGHT SOURCE - The display device includes a light source, and a control section adapted to generate a composite pulse width modulation signal using PWM1 having a first Duty ratio and PWM2 having a frequency higher than the frequency of PWM1, and control a light emitting state of the light source using the composite pulse width modulation signal. The control section corrects a second Duty ratio based on a difference between an expected value of luminance obtained when making the light source emit light using a virtual pulse width modulation signal, which is obtained by combining PWM1 and a pulse width modulation signal having the second Duty ratio, and a setting value of luminance based on the information related to the luminance of the light source, and then uses the second Duty ratio corrected as the Duty ratio of PWM2. | 03-06-2014 |
20140146092 | DISPLAY DEVICE AND METHOD OF CONTROLLING DISPLAY DEVICE - A display device includes a solid-state light source driven by a PWM signal, a light modulation device that modulates light emitted by the solid-state light source in response to an image signal, and a signal output unit that determines a duty ratio and a current value of the PWM signal in response to brightness of an image represented by the image signal. The signal output unit outputs a PWM signal having a predetermined first current value to the solid-state light source if the duty ratio is equal to or more than a predetermined first threshold value and outputs a PWM signal having a current value less than the first current value to the solid-state light source if the duty ratio is less than the first threshold value. | 05-29-2014 |
20140192331 | PROJECTOR AND METHOD FOR CONTROLLING THE SAME - A projector includes a light detector that detects light brightness information on the brightness of light emitted from a light source and an adjuster that corrects the light brightness information detected with the light detector and adjusts the output from the light source based on the corrected light brightness information. | 07-10-2014 |