Data Signal Compensation In Response To Temperature Patents (Class 345/101)
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Patent number: 9099053Abstract: A control circuit for a display device includes a shift register circuit which includes at least one transistor and outputs a gate signal in response to at least one voltage signal, a temperature information acquisition unit configured to acquire temperature information at the control circuit for a display device, and a voltage switching unit configured to switch a voltage of the at least one voltage signal based on the acquired temperature information.Type: GrantFiled: February 22, 2011Date of Patent: August 4, 2015Assignees: JAPAN DISPLAY INC., PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.Inventors: Shuuichirou Matsumoto, Mitsuru Goto
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Patent number: 9093041Abstract: Methods and apparatus are provided for compensating a liquid crystal display for changes in brightness level. The apparatus comprises a variable brightness back-light optically coupled to a display panel whose properties depend upon back-light brightness. An electrical circuit measures back-light brightness and/or display flicker and sends this information to a controller. The controller automatically determines a display panel compensation signal based on back-light brightness and/or display flicker, and sends this compensation signal to the display panel to optimize the display panel properties for the commanded or observed back-light brightness level or flicker level so as to, for example, minimize display panel flicker and/or ghost image retention. Such automatic compensation is especially useful for head-up displays that must accommodate large variations in display brightness, e.g.Type: GrantFiled: November 28, 2005Date of Patent: July 28, 2015Assignee: HONEYWELL INTERNATIONAL INC.Inventors: John F. L. Schmidt, Victoria P. Haim, Elias S. Haim
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Patent number: 9086316Abstract: A control unit for controlling the temperature of a spectrometer to be constant stores a first temperature coefficient indicating a proportion of a temperature change of the spectrometer to a room temperature change and a second temperature coefficient indicating a proportion of the temperature change of the spectrometer to a change in the air volume of blower means, and calculates the amount of change in the air volume of the blower means necessary to offset a change in the temperature of the spectrometer from a predetermined constant temperature, by using the first temperature coefficient and the second temperature coefficient, and controls driving of the blower means based on the calculated amount of change in the air volume.Type: GrantFiled: March 27, 2012Date of Patent: July 21, 2015Assignee: SHIMADZU CORPORATIONInventor: Masahide Gunji
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Patent number: 9082354Abstract: The present invention in its first aspect provides a display apparatus including a light emitting apparatus having a plurality of light sources, a brightness sensor that measures an emission brightness of the light emitting apparatus corresponding to each of blocks, a temperature sensor that measures a temperature of the light emitting apparatus corresponding to each of the blocks, an acquisition unit that acquires the measured value of the temperature sensor for each of the blocks, and an emission brightness control unit that performs processing of acquiring the measured value of the brightness sensor and controlling the emission brightness based on the measured value of the brightness sensor, in order from a block with a greatest difference between a temperature represented by the measured value acquired by the acquisition unit and a temperature represented by the measured value acquired in the past by the acquisition unit.Type: GrantFiled: January 14, 2013Date of Patent: July 14, 2015Assignee: CANON KABUSHIKI KAISHAInventor: Kinshiro Fujinaka
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Patent number: 9076406Abstract: A power supplying unit for a liquid crystal display device includes: a power integrated circuit for generating a source voltage and a compensation voltage, the compensation voltage linearly varying according to an ambient temperature; and a charge pumping part for generating a gate high voltage using the source voltage and the compensation voltage, the gate high voltage linearly varying when the ambient temperature is lower than a reference temperature.Type: GrantFiled: December 29, 2011Date of Patent: July 7, 2015Assignee: LG Display Co., Ltd.Inventors: Seung-Pyo Seo, Hyoun-Woo Kim, Sung-Chul Ha
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Publication number: 20150145896Abstract: A stereoscopic image display device includes an image compensator, a signal controller, a data driver, and a display panel. The image compensator is configured to convert input image data to revised image data. The revised image data is obtained by compensating for temperature variations of the display panel. The signal controller is configured to output the revised image data. The data driver is configured to receive the revised image data. The display panel includes a plurality of pixels configured to display a left eye image and a right eye image in response to receiving a data voltage from the data driver. The image compensator includes a temperature compensation lookup table selector having a temperature compensation lookup table, and a standard lookup table selector having a standard lookup table and configured to select the revised image data according to correction values selected from the temperature compensation lookup table.Type: ApplicationFiled: July 16, 2014Publication date: May 28, 2015Inventors: HOON KIM, JANG-KUN SONG, HEE SEOP KIM, KI CHUL SHIN
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Patent number: 9030400Abstract: A liquid crystal display, including: pixels; a signal controller receiving an input image signal and an input control signal and outputting a processing image signal and a control signal; and a data driver changing the processing image signal to data voltage on the basis of the control signal to supply the data voltage to the pixel and sharing charges of odd channel data voltage of an odd channel and even channel data voltage of an even channel which have different polarities on the basis of a temperature.Type: GrantFiled: April 30, 2012Date of Patent: May 12, 2015Assignee: Samsung Display Co., Ltd.Inventors: Whee-Won Lee, Jae Hoon Lee, Young-Su Kim
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Patent number: 9019193Abstract: A method of compensating image data, the method includes generating a compensation data of an image data in accordance with a temperature value by using a compensation data of a previous frame and a compensation data generated through a look-up table which is mapped with corresponding to a compensation data of a previous frame and a set temperature value which is smaller than and closest to the temperature value or which is greater than and closest to the temperature value among set temperature values.Type: GrantFiled: December 16, 2010Date of Patent: April 28, 2015Assignee: Samsung Display Co., Ltd.Inventors: Bong-Im Park, Jun-Pyo Lee, Ik-Huyn Ahn, Ho-Seok Son, Kang-Min Kim, Jung-Won Kim, Seon-Ki Kim
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Patent number: 9019257Abstract: A gate driving circuit of a display panel is provided. A gate driving voltage is accurately adjusted by the gate driving circuit according to an environmental temperature, given that the characteristics of a thermistor and a hysteresis loop are taken into consideration. Accordingly, the power loss caused by switching states of a display panel can be reduced.Type: GrantFiled: April 5, 2012Date of Patent: April 28, 2015Assignee: Chunghwa Picture Tubes, Ltd.Inventor: Chang-Xin Huang
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Patent number: 9001163Abstract: A method of driving an image display device including (A) an image display panel in which pixels each having first to fourth subpixels displaying first to third primary colors and fourth color, respectively are arranged in a two-dimensional matrix, and (B) a signal processor, in an i-th image display frame, in the signal processor, first to fourth subpixel output signals are obtained on the basis of at least first to fourth subpixel input signals and a corrected expansion coefficient ??i-0, and output to the first to fourth subpixels, respectively, the maximum value Vmax(S) of luminosity with saturation S in an HSV color space is obtained in the signal processor or stored in the signal processor, and in the i-th image display frame, in the signal processor, (a) saturation Si and luminosity Vi(S) in pixels are obtained, (b) an expansion coefficient ?i-0 is obtained, and (c) the corrected expansion coefficient ??i-0 is determined.Type: GrantFiled: July 19, 2012Date of Patent: April 7, 2015Assignee: Japan Display Inc.Inventors: Masaaki Kabe, Toshiyuki Nagatsuma, Shunsuke Noichi, Yasuyuki Matsui, Soichiro Kurokawa, Akira Sakaigawa, Amane Higashi
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Patent number: 8988328Abstract: In a display device including a driving transistor a driving current flows in accordance with a signal voltage supplied via a data line, so that gray scale display in accordance with the signal voltage is carried out. An electro-optical element emits light in response to the driving current. The driving transistor is provided with a signal voltage at displaying a center gray scale among all display gray scale levels within a voltage region in which the driving current in a temperature range of 0° C. to 40° C. is in a range of 98% to 102% of a driving current that flows at an average driving temperature.Type: GrantFiled: July 24, 2007Date of Patent: March 24, 2015Assignee: Sharp Kabushiki KaishaInventor: Noritaka Kishi
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Patent number: 8970562Abstract: A temperature sensing apparatus (10) and associated method (60) wherein a temperature sensor (22) or a plurality of temperature sensors (22) is placed in or in near proximity to a liquid crystal display module (12) of a computer system (11, 11a, 11b). The temperature sensor(s) (22) are placed on, or in near proximity to the liquid crystal display module (12) at positions determined according to the requirements of a particular application. Temperature of the liquid crystal display module (12) is communicated digitally to an associated computer (14) by, for example, a bus such as an inter-integrated circuit interface bus (26). When the temperature exceeds a predetermined limit, remedial action, such as increasing fan speed, reducing speed and or power consumption of other components, or the like, is taken to reduce the temperature.Type: GrantFiled: March 1, 2005Date of Patent: March 3, 2015Assignee: Apple Inc.Inventors: Gang Xu, Aaron M. Leiba, John Z. Zhong
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Patent number: 8970468Abstract: An electronic device may include a display and display control circuitry. The display may be calibrated to compensate for changes in display temperature. Display calibration information may be obtained during manufacturing and may be stored in the electronic device. The display calibration information may include color-specific adjustment factors configured to adjust display colors and reduce temperature-related color shifts. During operation of the display, the display control circuitry may receive input pixel values for a display pixel. The display control circuitry may also receive display temperature information from a temperature sensor in the electronic device. The display control circuitry may determine adjustment factors based on a color associated with the input pixel values and the display temperature information. The display control circuitry may apply the adjustment factors to the input pixel values to obtain adapted pixel values. The adapted pixel values may be provided to the display pixel.Type: GrantFiled: November 21, 2012Date of Patent: March 3, 2015Assignee: Apple Inc.Inventors: Marc Albrecht, Ulrich Barnhoefer, Gabriel Marcu, Sandro H. Pintz
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Patent number: 8963895Abstract: A ubiquitously mountable image display system includes a shape-reconfigurable display screen component to which is attached a plurality of circuit modules each having at least one light source. The shape-reconfigurable display screen component is formed of a material that accommodates flexing of the display screen component without creating a perceivable aberration in separation distance between two or more picture elements of an image that is rendered upon a viewing plane of the display screen component when light from the plurality of light sources is directed towards the viewing plane.Type: GrantFiled: September 22, 2011Date of Patent: February 24, 2015Assignee: Nano Lumens Acquisition Inc.Inventors: Richard Cope, Aris Silzars
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Patent number: 8957882Abstract: A gate drive circuit includes a shift register in which plural stages are cascade-connected to each other. In an n-th stage, a pull-up part outputs a high voltage of a clock signal to an output node as a high voltage of an n-th gate signal in response to a high voltage on a first node. A pull-down part pulls the high voltage of the n-th gate signal down to a first low voltage in response to an (n+1)th carry signal. A discharging part discharges the first node to a second low voltage level lower than the first low voltage level in response to the (n+1)th carry signal. A carry part outputs the high voltage of the clock signal as an n-th carry signal (mirroring the n-th gate signal) in response to a high voltage on the first node.Type: GrantFiled: November 9, 2011Date of Patent: February 17, 2015Assignee: Samsung Display Co., Ltd.Inventors: Jae-Hoon Lee, Young-Su Kim, Whee-Won Lee, Jun-Yong Song, Yu-Han Bae, You-Mee Hyun
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Patent number: 8917263Abstract: Provided is a method of driving a liquid crystal panel by providing a gate delay compensation period to a timing at which gate selection signal waveforms supplied to horizontal scanning interconnections change so that a switching element changes from a conduction state to a non-conduction state with respect to a timing at which image data signal waveforms supplied to data interconnections change so that image data corresponding to display contents of a pixel electrode connected to the horizontal scanning interconnections changes to next image data, wherein an ambivalent temperature is detected to make the gate delay compensation period variable in accordance with the ambivalent temperature.Type: GrantFiled: May 24, 2010Date of Patent: December 23, 2014Assignee: Mitsubishi Electric CorporationInventor: Hideyo Ohtsuki
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Patent number: 8879229Abstract: A display panel driver circuit includes multiple drivers adapted for cooperatively driving a display panel and each operable under a protection mode, and an overheat protection device including multiple protection circuits, each of which controls a respective one of the drivers to operate under the protection mode in response to receipt of an enable signal, an interface circuit which transmits the enable signal to each of the protection circuits in response to receipt of a warning signal, and multiple temperature detection circuits, each of which is able to detect a temperature associated with a respective one of the drivers, and outputs the warning signal to the interface circuit based on the temperature thus detected.Type: GrantFiled: March 11, 2013Date of Patent: November 4, 2014Assignee: ILI Technology CorporationInventors: Chih-Kang Cheng, Feng-Hsiang Huang
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Patent number: 8850714Abstract: A chromaticity correction device corrects chromaticity of a video signal displayed on a display panel of a display device to correspond to a change in a luminance value of the display panel. The chromaticity correction device includes a luminance detection unit which detects the luminance value, a backlight driving level detection unit which detects a backlight driving level, a temperature detection unit which detects an internal device temperature or an ambient temperature, a reference luminance value calculation unit which estimates a reference luminance value in a characteristic of an initial state, a chromaticity calculation unit which obtains a chromaticity change amount of white point chromaticity and estimated white point chromaticity that is an estimated value of current white point chromaticity, a chromaticity correction value calculation unit which obtains a chromaticity correction value and a chromaticity correction circuit which corrects the chromaticity of the video signal.Type: GrantFiled: September 30, 2011Date of Patent: October 7, 2014Assignee: NEC Display Solutions, Ltd.Inventor: Katsuyuki Matsui
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Patent number: 8791936Abstract: The present invention relates to a LCD module and a method thereof. The LCD module includes a gate driver, a liquid crystal display panel having a plurality of pixel units, a temperature sensor for generating a temperature sensing signal based on a temperature of the liquid crystal display panel, and a voltage regulator for adjusting scan voltage according to the temperature sensing signal. The gate driver outputs a scan signal with the adjusted scan voltage to the plurality of pixel units. The LCD module can adjust the scan voltage based on a variety of the temperature of the LCD panel to further change current charging the pixel units, shortening a response time period of the LCD module.Type: GrantFiled: April 6, 2011Date of Patent: July 29, 2014Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd.Inventors: Dengxia Zhao, Yu Wu
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Patent number: 8773339Abstract: A method of driving a display panel includes applying a common voltage to the display panel, sensing a frequency of the display panel to generate a frequency signal, adjusting a gain of an operational amplifier based on the frequency signal, receiving a feedback common voltage from the display panel, and compensating the common voltage using an input resistor, the operational amplifier and a feedback resistor based on the feedback common voltage to apply the compensated common voltage to the display panel. The operational amplifier includes an inverting input terminal connected to the input resistor, a non-inverting input terminal to which a reference common voltage is applied and an output terminal. The feedback resistor is between the inverting input terminal and the output terminal.Type: GrantFiled: August 15, 2011Date of Patent: July 8, 2014Assignee: Samsung Display Co., Ltd.Inventors: Young-Su Kim, Jae-Hoon Lee, Chang-Ho Lee, Yu-Han Bae
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Patent number: 8773451Abstract: Method and apparatus for adjusting the display characteristics of an electronic display, such as a computer or television display. The display is color corrected, e.g., at the factory, to measure its white point correction, gamma and gray tracking correction, and the gain correction over time as the display warms up. Moreover the white point correction and the gamma correction are performed on a per unit basis for each individual display to be manufactured. The resulting correction parameters are stored in memory or firmware associated with the display. Thereby when the display is in use, it performs compensation for white point, gray tracking and gain correction as the display warms up, each time it is powered up or when its thermal operation conditions change.Type: GrantFiled: May 3, 2011Date of Patent: July 8, 2014Assignee: Apple Inc.Inventors: Gabriel Gheorghe Marcu, Wei Chen, David W. Lum, Jean-Jacques P. Drolet
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Patent number: 8773347Abstract: An electro-optical device includes an element substrate having a temperature detection conductive film formed by doping with an impurity in the same semiconductor layer as a semiconductor layer of transistor; and a driving portion for supplying a driving signal, wherein the driving portion includes a data conversion portion for converting image data and generating, as the driving signal, a digital driving signal made of an ON-voltage in which the brightness of the pixel is saturated and an OFF-voltage in which the pixel becomes a light-off state in each of a plurality of subfields in which a field period is divided on a time axis, and the data conversion portion performs a correction corresponding to a change in resistance in the temperature detection conductive film when generating the digital driving signal.Type: GrantFiled: December 10, 2010Date of Patent: July 8, 2014Assignee: Seiko Epson CorporationInventor: Yasushi Hiroshima
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Patent number: 8766889Abstract: A liquid crystal display and a driving method thereof are provided. The liquid crystal display includes a plurality of pixels, a plurality of scan lines, and a plurality of data lines. Each pixel includes a plurality of sub-pixels. Each sub-pixel is coupled to the data line, and includes a switch, a storage capacitor, and a sub-pixel electrode. The switch is coupled to a scan line to receive a scan signal. The switch is turned on by the scan signal to receive a data signal transmitted from the data line. The storage capacitors of the sub-pixels of each pixel are coupled to the scan lines, or the storage capacitor of one of the sub-pixels of each pixel is coupled to a common electrode and the storage capacitors of the other sub-pixels are coupled to the scan lines. The switch and the storage capacitor of each sub-pixel are coupled to different scan lines.Type: GrantFiled: March 27, 2008Date of Patent: July 1, 2014Assignee: Au Optronics CorporationInventors: Ming-Sheng Lai, Chih-Wei Wang, Hsueh-Ying Huang, Chen-Kuo Yang
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Patent number: 8736540Abstract: A liquid crystal display (LCD) includes: a gate-off voltage generator including a temperature compensation unit which comprises a constant voltage output device and which outputs a gate-off voltage having a level which varies based on a change in ambient temperature; a clock generator outputting a first clock signal and a second clock signal; a gate driver outputting gate signals; and a plurality of pixels which turn on or off based on the gate signals, wherein the constant voltage output device outputs a temperature variable voltage having a value based on a voltage difference between a reference terminal of the constant voltage output device and an input terminal of the constant voltage output device, and a voltage difference between the reference terminal and the input terminal of the constant voltage output device varies based on the change in the ambient temperature.Type: GrantFiled: September 10, 2012Date of Patent: May 27, 2014Assignee: Samsung Display Co., Ltd.Inventors: Eun-Woo Jeong, Sang-Hoon Park, Hwan-Jun Sung
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Patent number: 8730146Abstract: A drive voltage generating circuit which has a first shifter receiving an input voltage and outputting a first drive voltage obtained by first shifting a voltage level of the input voltage; a second shifter receiving outputting the second drive voltage obtained by second shifting a voltage level of the first drive voltage; and a drive voltage controller adjusting one of a shifting amount of the first shifter and a shifting amount of the second shifter in accordance with a surrounding temperature, wherein the second drive voltage is continuously varied in an analog manner, in accordance with the surrounding temperature.Type: GrantFiled: August 11, 2009Date of Patent: May 20, 2014Assignee: Samsung Display Co., Ltd.Inventor: Yong-Soon Lee
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Patent number: 8711087Abstract: A method for driving an electrophoretic display device, which includes a first electrode, a second electrode, and an electrophoretic element disposed between the first electrode and the second electrode, the method includes: setting a multiplication of a driving voltage and a voltage application time of the electrophoretic element in a unit period, which displays a first gradation with minimum reflectivity, and a multiplication of a driving voltage and a voltage application time of the electrophoretic element in the unit period, which displays a second gradation with maximum reflectivity, so as to be different from each other.Type: GrantFiled: January 25, 2010Date of Patent: April 29, 2014Assignee: Seiko Epson CorporationInventors: Yoshiki Takei, Eiji Miyasaka
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Patent number: 8687026Abstract: Disclosed embodiments relate to a display temperature detection system that can detect temperature variations in different regions of a display panel. The temperature measuring display system includes a display panel that provides graphical images. Further, the temperature measuring display system includes temperature measurement circuitry. The temperature measurement circuitry includes one or more thermal diodes, transistors, or a mesh layer useful to determine at least one temperature measurement of the display panel.Type: GrantFiled: September 28, 2011Date of Patent: April 1, 2014Assignee: Apple Inc.Inventors: Joshua Grey Wurzel, Ahmad Al-Dahle
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Patent number: 8659628Abstract: A method for controlling gate signals of a liquid crystal display (LCD), including generating gate signal with a modulated pulse width according to the gate signal with a default pulse width; when the LCD is booting up, outputting the gate signal with the modulated pulse width; and when a backlight module of the LCD is turned on, switching the gate signal with the modulated pulse width to the gate signal with the default pulse width. This way, the pulse width of the gate signal is increased after the LCD is boot up and before the backlight module is turned on, enabling the LCD to be boot properly in low temperature, without the need to raise the voltage level of the gate signal.Type: GrantFiled: May 23, 2011Date of Patent: February 25, 2014Assignee: AU Optronics Corp.Inventors: Chun-Kuei Wen, Shih-Hsun Lo, Shih-Chieh Kuo, Che-Hsien Chen
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Patent number: 8654051Abstract: A liquid crystal display device includes: a liquid crystal panel; a temperature sensing means configured to measure a real-time temperature of the liquid crystal panel; a backlight unit configured to supply a light to the liquid crystal panel; a control unit configured to convert an image signal into an RGB signal and to convert a first dimming signal to a second dimming signal according to the real-time temperature; and an inverter unit configured to adjust the backlight unit using the second dimming signal.Type: GrantFiled: December 2, 2009Date of Patent: February 18, 2014Assignee: LG Display Co., Ltd.Inventor: Byoung-Gwan Lee
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Patent number: 8599116Abstract: A light-emitting device includes a plurality of pixels, a temperature-detection pixel, a temperature detector, an applied-current calculator, and a current applying unit disposed on a substrate. The pixels include display light-emitting elements for displaying information. The temperature-detection pixel is provided within a display area where the pixels are disposed and includes a temperature-detection light-emitting element for temperature detection, which is shielded by a light shielding layer and includes the same organic layer as that included in each display light-emitting element. The temperature detector detects a current value of the temperature-detection light-emitting element so as to detect the temperature thereof. The applied-current calculator calculates an electric current to be applied to the display light-emitting elements in accordance with the detected temperature so that the display light-emitting elements emit light with a predetermined luminance.Type: GrantFiled: March 12, 2007Date of Patent: December 3, 2013Assignee: Seiko Epson CorporationInventor: Etsuo Mitsuhashi
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Patent number: 8593449Abstract: A reference voltage generation circuit of the disclosure includes a first amplifier circuit and a second amplifier circuit. The first amplifier circuit includes a first input stage including two npn transistors or two NMOS transistors having base terminals or gate terminals to which a variable voltage and a predetermined lower limit voltage are inputted. A first output stage includes a pnp transistor or a PMOS transistor having an emitter terminal or a source terminal connected to an output terminal of a reference voltage. A first amplifier stage controls the first output stage for equalizing the higher one of the variable voltage and the lower limit voltage with the reference voltage.Type: GrantFiled: May 27, 2011Date of Patent: November 26, 2013Assignee: Rohm Co., Ltd.Inventor: Kazuhiro Murakami
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Patent number: 8587502Abstract: In one embodiment of the present application, a liquid crystal panel drive device includes a signal processing section for determining an output gray scale in accordance with a gray scale transition from the gray scale which is forecasted to reach by a previous response to an input gray scale and can carry out overdrive with the output gray scale. At a temperature at which a rise gray scale transition may occur in absence of a response condition does not exist for single overdrive, the signal processing section determines, as an output gray scale, a gray scale lower than a maximum gray scale with respect to a particular gray scale transition out of a rise type gray scale transition. In such a way, a display quality (especially a moving image display quality) at a low temperature can be improved.Type: GrantFiled: May 21, 2007Date of Patent: November 19, 2013Assignee: Sharp Kabushiki KaishaInventors: Koki Hongo, Tomoo Furukawa, Kazuyoshi Fujioka
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Patent number: 8581940Abstract: A display device includes a display panel having a plurality of pixels, a drive circuit inputting a drive voltage to the plurality of pixels, and a display control device controlling and driving the drive circuit and to which display data is input from an external apparatus, in which a temperature detecting sensor is included. The display control device has a display bit reduction circuit. In a high-temperature operation mode when a temperature equal to or more than a predetermined temperature is detected at the temperature detecting sensor, the display bit reduction circuit ignores bits other than the highest-order bit of the display data input from the external apparatus and sends only the data of the highest-order bit of the display data input from the external apparatus to the drive circuit.Type: GrantFiled: July 2, 2009Date of Patent: November 12, 2013Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventor: Hiroshi Kurihara
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Patent number: 8564527Abstract: A circuit generates a reference voltage in inverse proportion to the variation in temperature to control the gate-on voltage for a gate line of a liquid crystal display so that the liquid crystal display may display an image without distortion.Type: GrantFiled: July 21, 2006Date of Patent: October 22, 2013Assignee: Samsung Display Co., Ltd.Inventor: Hong-Sig Chu
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Patent number: 8552962Abstract: A display apparatus driving circuit capable of reducing the amount of heat generated at a driving unit while suppressing degradation in image quality is provided. A display apparatus driving circuit according to the present invention includes: a source driver for driving a display unit; a heat detecting circuit for detecting amount of heat generated at the source driver, and outputting a heat detection signal when the detected amount of generated heat is equal to or larger than a predetermined reference value; and a heat reduction circuit for changing, when the heat detection signal is received, a driving method of the display unit to reduce the amount of heat generated at said source driver.Type: GrantFiled: August 29, 2011Date of Patent: October 8, 2013Assignee: Panasonic CorporationInventors: Yoshiyuki Otani, Hiroshi Kojima, Masaaki Nishihara, Tomoya Ishikawa, Tooru Suyama
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Patent number: 8547321Abstract: A method and apparatus for providing a LED backlight to a LCD display screen is disclosed. In one embodiment, the apparatus includes: N LED strings, wherein N is an integer greater than or equal to two; a first circuit operable to synchronize a LED clock signal to a LCD timing signal; and a second circuit operable to generate N PWM drive signals synchronized with the LED clock signal, wherein the N PWM drive signals are phase offset from each other by a multiple of 360/N degrees and used to drive respective ones of the N LED strings.Type: GrantFiled: July 23, 2008Date of Patent: October 1, 2013Assignee: Apple Inc.Inventor: Eric Smith
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Patent number: 8547370Abstract: In a voltage generating circuit and a display apparatus, a driving voltage generator receives an input voltage to output a first driving voltage and a second driving voltage that is inversely proportional to a temperature in response to a feedback voltage. A temperature compensator generates the feedback voltage as a function of the temperature and the second driving voltage and applies it to the driving voltage generator. A gate-on voltage generator pumps the second driving voltage to generate a gate-on voltage, and a gamma voltage generator outputs a plurality of gamma voltages, each having a different voltage level that is disposed between the first driving voltage and a ground voltage. The gate-on voltage, which is inversely proportional to the temperature, is applied to the gate driver, and the gamma voltages, which are maintained at constant levels, prevent the response speed of the display apparatus from varying with temperature.Type: GrantFiled: August 10, 2007Date of Patent: October 1, 2013Assignee: Samsung Display Co., Ltd.Inventors: Sung-Hwan Hong, Nam-Seok Lee, Sung-Kyu Hong, Ho-Yun Byun
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Patent number: 8531378Abstract: A liquid crystal display comprises a back light emitting monochromatic light, a liquid crystal display element comprising, a pair of opposing substrates, a nematic liquid crystal layer placed between the pair of opposing substrates, an electrode pattern formed on a nematic liquid crystal layer side of each substrate, a pair of polarizers placed outside the pair of substrates, and a controller which controls light emission of the back light and a voltage applied to the liquid crystal display element, wherein the controller restrain change in retardation of the liquid crystal display element by lowering non-selection voltage applied to the liquid crystal display element when environmental temperature increases and increasing non-selection voltage applied to the liquid crystal display element when environmental temperature decreases.Type: GrantFiled: June 22, 2009Date of Patent: September 10, 2013Assignee: Stanley Electric Co., Ltd.Inventor: Takashi Sugiyama
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Patent number: 8525767Abstract: The present invention directs to a method for automatically compensating a common electrode voltage, comprising: calculating an average shift amount of a common electrode voltage according to gray scale data in a line on a displayed image, processing the average shift amount of the common electrode voltage to be a digital signal then converting it into an analog signal then into an average shift amount voltage waveform, and superposing it with a common electrode voltage waveform to form a new output signal waveform for driving the common electrode; the present invention also directs to a device for automatically compensating a common electrode voltage, comprising a data input module, a looking up module, a data operation module, a data encoding and converting module, a waveform generator and an operational amplification module.Type: GrantFiled: May 29, 2008Date of Patent: September 3, 2013Assignee: Beijing Boe Optoelectronics Technology Co., Ltd.Inventor: Xinshe Yin
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Patent number: 8519936Abstract: A liquid crystal display device includes: first and second substrates between which a liquid crystal forming material is sandwiched and which are disposed to be opposite to each other; a pair of electrodes including one and the other electrodes; a control means for controlling a voltage applied between the electrodes; and a temperature detector. The control means applies a voltage, by which a change of light transmittance occurs based on an induction and disappearance phenomenon of a nematic phase in the liquid crystal forming material, between the electrodes when a temperature of the liquid crystal forming material is in an isotropic phase temperature range, and the control means applies a voltage, by which a change of light transmittance occurs based on a change of orientation of directors of the liquid crystal forming material, between the electrodes when the temperature of the liquid crystal forming material is in a nematic phase temperature range.Type: GrantFiled: December 27, 2010Date of Patent: August 27, 2013Assignee: Japan Display West Inc.Inventor: Masahiro Kosuge
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Patent number: 8519926Abstract: A liquid crystal display (LCD) device with a register-type gamma reference voltage generating unit inside a data driving IC, thus to remove a source block dim phenomenon in a Chip on Glass (COG) cascade structure, and a driving method thereof. The LCD device comprises an LCD panel on which a plurality of gate lines and data lines intersect with each other. A TFT is formed at each intersection, to thus define images. A data driving unit supplies a gradation voltage to the LCD panel through a gamma voltage generating unit. A gate driving unit supplies a gate pulse to each gate line on the LCD panel. A timing controller controls the gate driving unit, the data driving unit and the gamma voltage generating unit.Type: GrantFiled: June 29, 2007Date of Patent: August 27, 2013Assignee: LG Display Co., Ltd.Inventor: Hong-Youl Lim
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Patent number: 8508461Abstract: An electro-optical device includes pixels that is driven in response to an ON voltage or an OFF voltage supplied to the signal lines at a time when each of scanning lines is selected, a scanning line driving circuit that sequentially selects the scanning lines in each of a plurality of subfields within a field, a signal line driving circuit that outputs the ON voltage to the signal lines in at least one temperature compensation subfield and outputs either the ON voltage or the OFF voltage to each of the signal lines in accordance with a designated gray scale of each of the pixels in each of a plurality of gray scale control subfields, which is different from the temperature compensation subfield, and a control unit that sets a time length of the temperature compensation subfield to be changed in accordance with the temperature detected by a temperature detecting unit.Type: GrantFiled: January 22, 2010Date of Patent: August 13, 2013Assignee: Seiko Epson CorporationInventor: Tomoyuki Okuyama
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Patent number: 8493302Abstract: The present invention aims to reduce flickers of the liquid crystal display device and enable the use of liquid crystal material exhibiting a high response speed, and to enhance light usage efficiency of the field sequential type liquid crystal display device. After writing the video signal to all the pixels in each sub-frame period, a correction voltage signal or an alternating signal having a frequency of greater than or equal to a certain frequency is input to the data line, so that the magnitude of the leakage current of each pixel TFT caused by the difference in polarity of the video signal with respect to the opposing electrode written to the pixel electrode is equalized, and the flickers are greatly reduced.Type: GrantFiled: March 21, 2008Date of Patent: July 23, 2013Assignee: NLT Technologies, Ltd.Inventor: Hiroyuki Sekine
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Publication number: 20130181961Abstract: The present invention in its first aspect provides a display apparatus including a light emitting apparatus having a plurality of light sources, a brightness sensor that measures an emission brightness of the light emitting apparatus corresponding to each of blocks, a temperature sensor that measures a temperature of the light emitting apparatus corresponding to each of the blocks, an acquisition unit that acquires the measured value of the temperature sensor for each of the blocks, and an emission brightness control unit that performs processing of acquiring the measured value of the brightness sensor and controlling the emission brightness based on the measured value of the brightness sensor, in order from a block with a greatest difference between a temperature represented by the measured value acquired by the acquisition unit and a temperature represented by the measured value acquired in the past by the acquisition unit.Type: ApplicationFiled: January 14, 2013Publication date: July 18, 2013Applicant: CANON KABUSHIKI KAISHAInventor: CANON KABUSHIKI KAISHA
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Patent number: 8487847Abstract: A liquid crystal display capable of improving its viewing angle characteristic of luminance is provided. The liquid crystal display includes: a pair of signal lines extending so as to intersect to each other; a pixel provided for the pair of signal lines and configured of a plurality of sub pixels, each sub pixel including a liquid crystal element and a capacitive element; a driving element provided for each of the plurality of sub pixels so as to be connected to a corresponding pair of signal lines assigned to the pixel, and performs display driving by applying a voltage to the liquid crystal element based on a video signal; and a capacitance line provided for each of the plurality of sub pixels so as to be connected to one end of the capacitive element.Type: GrantFiled: December 4, 2008Date of Patent: July 16, 2013Assignee: Sony CorporationInventors: Kazuya Ueda, Tsuyoshi Kamada
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Publication number: 20130127699Abstract: Examples of the present invention disclose system and method timing adjustment of a backlight module for a display. According to one example, a temperature of the display is monitored and a response time associated with the display is determined based on the temperature. Furthermore, a power-on timing and/or a power-off timing of the backlight module is adjusted based on the determined response time and the monitored temperature.Type: ApplicationFiled: October 28, 2010Publication date: May 23, 2013Applicant: Hewlett-packard Development Company LPInventor: Lee Warren Atkinson
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Publication number: 20130120233Abstract: A liquid crystal display includes a pixel, a memory configured to store a plurality of look-up tables, an image signal modification unit configured to obtain a modified look-up table based on a first look-up table and a second look-up table among the plurality of look-up tables and modify an input image signal based on the modified look-up table to generate a modified image signal, and a data driver configured to convert the modified image signal generated by the image signal modification unit into a data voltage and to supply the data voltage to the pixel. The liquid crystal display includes a plurality of regions. The liquid crystal display is configured to maintain temperature information of the plurality of regions, and the image signal modification unit is configured to modify the input image signal based on the temperature information.Type: ApplicationFiled: March 30, 2012Publication date: May 16, 2013Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jae-Gwan JEON, Jae Hyoung PARK, Byung Kil JEON, Byoung Seok YOO, Bong-Ju JUN
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Publication number: 20130083086Abstract: A display device includes: a display element having memory properties; an electrostatic capacitance detection circuit; a temperature sensor detecting the temperature of the display element; and a control unit, wherein the control unit includes: a drive condition adjustment circuit configured to adjust the drive condition of the display element based on the electrostatic capacitance detected in the display state where the display element is driven under a predetermined drive condition; and a temperature compensation storage circuit storing one or more temperature compensation models indicating a correspondence relationship of the drive condition with which the display element has the optimum display characteristics across a predetermined temperature range, and the control unit changes the drive conditions of the display element at temperatures other than the temperature when the adjustment is performed based on: the temperature when the drive condition of the display element is adjusted; and the temperature coType: ApplicationFiled: July 13, 2012Publication date: April 4, 2013Applicant: FUJITSU LIMITEDInventor: Masaki NOSE
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Patent number: 8405600Abstract: A method for reducing temperature-caused degradation of the performance of a digital reader comprising pixels, the method including positioning at least one sheet of compressed particles of exfoliated graphite adjacent to a plurality of the pixels of the digital reader.Type: GrantFiled: December 4, 2009Date of Patent: March 26, 2013Assignee: GrafTech International Holdings Inc.Inventors: Bradley E. Reis, Robert Anderson Reynolds, III, James T. Petroski, Yin Xiong
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Patent number: 8405598Abstract: In an overdrive method, target level values of an entire frame are inputted and retained in a first frame memory. According to a combination of a target level value and a currently predicted level value, an overdrive value is obtained from a first data table and an expected predicted level value after a predetermined number of frames varying with temperature is obtained from a second data table, both tables being established depending on temperature. The expected predicted level values of an entire frame are retained in a second frame memory. The same target level value is repetitively provided for the first and the second data tables, and the same expected predicted level value is repetitively provided for the first and the second data tables as the currently predicted level value. According to the overdrive value, a driving voltage is applied to the LCD element.Type: GrantFiled: April 22, 2009Date of Patent: March 26, 2013Assignee: Chimei Innolux CorporationInventor: Naoki Sumi