Waveform Generation Patents (Class 345/94)
  • Patent number: 8264446
    Abstract: A driving apparatus for a display device includes a plurality of pixels arranged in a matrix, and each pixel includes first and second sub-pixels. The driving apparatus includes a memory for storing digital data, a controller for calling the digital data to output the digital data together with a clock signal and at least one selection signal, and a gray voltage generator formed of an integrated circuit to receive the digital data from the controller and to generate gray reference voltage sets. The gray voltage generator includes first and second registers for storing the digital data, a selector including a plurality of multiplexers for receiving the outputs of the first and second registers, and a converter including a plurality of digital-analog converters connected to the multiplexers. As described above, the gray voltage generator is provided in the form of a chip so that it is possible to reduce the area occupied on a printed circuit board (PCB) and to reduce the cost of the gray voltage generator.
    Type: Grant
    Filed: March 18, 2010
    Date of Patent: September 11, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seung-Woo Lee, Tae-Sung Kim, Jae-Hyoung Park
  • Patent number: 8264441
    Abstract: In one embodiment of the present invention, when a still image is displayed, applied voltages respectively corresponding to a total of n (n being an integer of not less than 4) types of gradation 0 to (n?1) are outputted to pixels. On the other hand, when a moving image is displayed, an applied voltage corresponding to a predetermined gradation m (1?m?(n?2)) is applied to the pixels instead of applied voltages respectively corresponding to gradations of less than the predetermined gradation m.
    Type: Grant
    Filed: February 2, 2006
    Date of Patent: September 11, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Asahi Yamato, Yuki Kawashima, Kiyoshi Nakagawa, Kohzoh Takahashi, Toshihiro Yanagi
  • Patent number: 8264423
    Abstract: Provided is a method of driving a display element in which color tone variation of white during repeated drive has been reduced. Also disclosed is a method of driving a display element in which an electrolyte comprising silver or a compound containing silver in a chemical structure thereof is contained between facing electrodes, comprising the step of applying a driving operation to the facing electrodes so as to induce dissolution and deposition of silver, wherein an impression necessary for displaying black color is the impression of a pulse applied to the facing electrodes, satisfying the following Expression (1). Expression (1) 1/100 ?TBP/TW?1/5, where TBP represents time width (ms) of one pulse applied in an applied direction necessary for black display, and TW represents the sum of applied time (ms) in an applied direction necessary for white display after conducting the black display employing the applied pulse.
    Type: Grant
    Filed: January 28, 2008
    Date of Patent: September 11, 2012
    Assignee: Konica Minolta Holdings, Inc.
    Inventor: Noriyuki Kokeguchi
  • Patent number: 8259052
    Abstract: An apparatus and method for driving a liquid crystal display device are disclosed in which the response speed of the liquid crystal can be increased without using a digital memory. The driving apparatus includes a liquid crystal panel with gate lines and data lines arranged perpendicularly to each other, a gate driver that supplies a gate pulse to the gate lines, and a data driver. The data driver samples an input N-bit digital data signal to generate an analog data voltage, generates a modulated data voltage for acceleration of a response speed of the liquid crystal according to an M-bit data value of the sampled digital data signal, mixes the modulated data voltage with the analog data voltage, and supplies the mixed data voltage to the data lines.
    Type: Grant
    Filed: August 15, 2005
    Date of Patent: September 4, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Seok Woo Lee, Nam Hee Kim
  • Patent number: 8253655
    Abstract: A common-voltage compensation circuit functions to provide a crosstalk interference suppressing mechanism for use in a liquid crystal display having a liquid-crystal capacitor and a storage capacitor. The compensation circuit includes a buffer for receiving a preliminary common voltage, a current/voltage converter, a high-pass filter and a ripple-voltage inverter. The current/voltage converter is utilized for generating a liquid-crystal capacitor common voltage furnished to the liquid-crystal capacitor according to an output current of the buffer. The high-pass filter performs a high-pass filtering operation on the liquid-crystal capacitor common voltage for extracting a ripple voltage. The ripple-voltage inverter is employed to generate a storage capacitor common voltage furnished to the storage capacitor through performing an inverting operation on the ripple voltage based on the preliminary common voltage.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: August 28, 2012
    Assignee: AU Optronics Corp.
    Inventors: Hui-Lung Yu, Chih-Yuan Chien, Ming-Yen Lin
  • Patent number: 8253674
    Abstract: A liquid crystal panel includes a glass substrate with pixel electrodes that are arranged in a matrix shape, TFTs that are connected to the pixel electrodes, and a glass substrate with an opposing electrode and color filters that are arranged in a matrix shape. A liquid crystal layer is formed in a space between the glass substrates by filling a ferroelectric liquid crystal into the space. When writing display data, and when deleting display data that has been written, a voltage, not including 0V, that becomes a voltage potential, or in other words, a voltage that is greater than a threshold voltage at which the optical characteristic of the filled ferroelectric liquid crystal changes is applied between the opposing electrode and pixel electrodes. An image is displayed over all gradation numbers, including the low-gradation side, and the display characteristic is improved.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: August 28, 2012
    Assignee: Fujitsu Limited
    Inventors: Tetsuya Makino, Toshiaki Yoshihara, Shinji Tadaki, Hironori Shiroto, Yoshinori Kiyota, Keiichi Betsui
  • Patent number: 8253675
    Abstract: A display apparatus and a method of operating the same are provided. The display apparatus includes a wireless communication device, and a display unit that receives a main clock and is operated by an operating frequency in response to the frequency of the main clock, and a main-clock-providing unit that measures noise in signals received from a wireless communication channel, and changes the frequency of the main clock to reduce the noise.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: August 28, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Bum-jin Kim, Seung-je Lee, Seoung-bum Pyoun, Woo-il Park, Dae-seoo Kim
  • Patent number: 8248344
    Abstract: A method of driving a liquid crystal display panel of a dot inversion system having liquid crystal cells arranged at intersections between a plurality of data lines and a plurality of gate lines in a matrix array, including supplying the data lines with (n?2)th data corresponding to the liquid crystal cells connected to an (n?2)th gate line, conducting a data supply channel for the liquid crystal cells connected to an nth gate line such that the (n?2)th data is supplied to the liquid crystal cells connected to the nth gate line, conducting a data supply channel for the liquid crystal cells connected to the nth gate line such that the (n?2)th data is supplied to the liquid crystal cells connected to the nth gate line, and conducting a data supplying channel for the liquid crystal cells connected to the (n?2)th gate line such that the (n?2)th data is supplied to the liquid crystal cells connected to the (n?2)th gate line, wherein conducting the data supply channel and conducting the data supplying channel are p
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: August 21, 2012
    Assignee: LG Display Co., Ltd.
    Inventor: Hong Sung Song
  • Patent number: 8248341
    Abstract: Described herein are systems and methods for the reduction of power consumption and mitigation of device stress accumulation in low frequency refreshed Liquid Crystal Displays (LCDs). In an exemplary embodiment, two or more transistors in series are used to hold charge on an LCD pixel. To prevent negative stress on the transistors, the transistors are alternately driven to an “on” state so that no one transistor sees a long “off” time. In another embodiment, circuits and signaling waveforms for performing frame writing and stress mitigation are provided that minimize dynamic power consumption and static power consumption in peripheral ESD circuits.
    Type: Grant
    Filed: April 15, 2009
    Date of Patent: August 21, 2012
    Assignee: Store Electronic Systems SA
    Inventor: Charles F. Neugebauer
  • Patent number: 8243001
    Abstract: A liquid crystal display (LCD) module includes a display unit for displaying images, a temporary storage unit electronically connected to the display unit for temporarily storing image data, and a timing unit electronically connected to the display unit. The display unit displays images corresponding to the image data stored in the temporary storage unit, and the timing unit generates a synchronous signal corresponding to the displaying operation.
    Type: Grant
    Filed: July 21, 2009
    Date of Patent: August 14, 2012
    Assignee: Chi Mei Communication Systems, Inc.
    Inventor: Szu-Ying Lin
  • Patent number: 8243057
    Abstract: An organic electroluminescent display and driving method thereof. The organic electroluminescent display includes a demultiplexer for outputting signals provided by a data driver to a plurality of data lines according to on/off operation of analog switches. The driving method divides a frame into two parts, and drives them. Data signals are applied to pixels which are not adjacent among the pixels of each row during the former ½ frame, and the data signals are applied to the pixels to which no data signal has been applied in the former ½ frame during the latter ½ frame.
    Type: Grant
    Filed: April 7, 2004
    Date of Patent: August 14, 2012
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventor: Dong-Yong Shin
  • Patent number: 8243227
    Abstract: An object of the present invention is to reduce the exterior of a display device while retaining a display screen at a certain size. A liquid crystal display panel including a TFT substrate formed with a glass substrate and a color filter substrate is stored in a frame made of a metal. In order to avoid the direct contact between the glass substrate and the frame made of a metal, part of an optical sheet included in a backlight disposed behind the liquid crystal display panel is extended to lie between the liquid crystal display panel and the frame, and is regarded as a spacer. Since the thickness of the optical sheet is as small as 0.06 mm, the spacer hardly affects the external dimensions of a display device. Consequently, while a crack of the glass substrate is prevented, the exterior of the display device can be reduced.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: August 14, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Eiji Oohira
  • Patent number: 8242999
    Abstract: A driving method for generating activating signals that serve to activate scan lines of a display panel includes generating the activating signals based on a plurality of recorded pulse duration information to thereby permit a time point at which a pulse duration of a preceding one of the activating signals in a consecutive pair ends occurs prior to a time point at which a pulse duration of a succeeding one of the activating signals in the consecutive pair starts. A driving device that performs the driving method is also disclosed. A method for adjusting pulse durations of the activating signals is further disclosed.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: August 14, 2012
    Assignee: Integrated Solutions Technology, Inc.
    Inventors: Po-Chih Lin, Cheng-Che Ho
  • Patent number: 8242989
    Abstract: An organic light emitting display includes a plurality of pixels arranged at intersecting points of data lines, scan lines and light emitting control lines; a sensing unit extracting a signal corresponding to a degradation level of organic light emitting diodes provided in each of the pixels; a storage unit storing the signal obtained from the sensing unit, calculating degradation level information of the organic light emitting diodes using the stored signal and storing the calculated information; a conversion unit for converting an input data (Data) into a correction data (Data?) using the degradation level information stored in the storage unit; and a data driver for receiving the correction data (Data?) outputted from the conversion unit and generating data signals to be supplied to the circuits.
    Type: Grant
    Filed: January 15, 2009
    Date of Patent: August 14, 2012
    Assignees: Samsung Mobile Display Co., Ltd., IUCF-HYU (Industry University Cooperation Foundation Hanyang University)
    Inventor: Oh-Kyong Kwon
  • Publication number: 20120200548
    Abstract: Since a first and a second source-follower PMOS transistor in a pixel have gates connected to a first and a second capacitor and are used always in on state, respectively, only respective threshold voltages in the first and second source-follower PMOS transistors are set to be +0.5 V and put in normally-on state. A current value in each of the first and second source-follower PMOS transistors is controlled by a constant current load transistor, and on/off thereof is controlled by the constant current load transistor and each of first and second switching NMOS transistors. Further, each of the first and second switching NMOS transistors intermediates to limit an outputtable voltage range and thereby optimization is performed so as to maximize a range where linearity is secured by shifting the respective threshold voltages of the first and second source-follower PMOS transistors.
    Type: Application
    Filed: February 3, 2012
    Publication date: August 9, 2012
    Applicant: JVC KENWOOD CORPORATION
    Inventor: Takayuki Iwasa
  • Patent number: 8237700
    Abstract: A pulse width modulation (PWM) signal generator generates multiple output PWM signals from an input PWM signal. The output PWM signals are synchronized to synchronization events. Each output PWM signal has a duty ratio substantially equal to the duty ratio of the input PWM signal, and each output PWM signal has a fixed phase-shift in relation to the other output PWM signals. The PWM signal generator samples an input PWM cycle to determine sample parameters representative of its duty ratio. The sample parameters are then used to generate a corresponding output PWM cycle for each of the output PWM signals. In response to a synchronization event, the PWM signal generator prematurely terminates the current PWM cycle and initiates the next PWM cycle while ensuring that the portion of the current output PWM cycle completed by the leading output PWM signal up to the point of the premature termination is replicated for the corresponding output PWM cycles of the other non-leading output PWM signals.
    Type: Grant
    Filed: November 25, 2009
    Date of Patent: August 7, 2012
    Assignee: Freescale Semiconductor, Inc.
    Inventor: Bin Zhao
  • Publication number: 20120194495
    Abstract: An LC barrier panel of a stereoscopic image display device has a substrate on which first barrier pixels and second barrier pixels are alternately arranged in a vertical direction and on which the first barrier pixels and third barrier pixels are alternately arranged in a horizontal direction. On a counter substrate, a counter electrode is formed to cover the entire surface of the display region. The third barrier pixels and the counter electrode are supplied with the same drive signal while an effective voltage is applied between the counter electrode and the first and second barrier pixels to perform vertical stripe display. Alternatively, the second barrier pixels and the counter electrode are supplied with the same drive signal while an effective voltage is applied between the counter electrode and the first and third barrier pixels to perform horizontal stripe display.
    Type: Application
    Filed: January 31, 2012
    Publication date: August 2, 2012
    Inventor: Jun KADOWAKI
  • Patent number: 8232948
    Abstract: Provided is a multilevel voltage driving device and system. The multilevel voltage driving device comprises a level converter, which is provided with an AC signal input terminal for inputting an AC signal, a high level output terminal for outputting a high level, and an intermediate level output terminal for outputting an intermediate level; and a switch selector, which is connected with the high level output terminal and the intermediate level output terminal, and which is provided with a control signal input terminal, for inputting a control signal to alternately select the high level and intermediate level, and an output terminal for outputting the selected level.
    Type: Grant
    Filed: December 18, 2007
    Date of Patent: July 31, 2012
    Assignee: Beijing Boe Optoelectronics Technology Co., Ltd.
    Inventors: Xinshe Yin, Ming Chen
  • Publication number: 20120188213
    Abstract: A liquid crystal display device (LCD), and a method of driving the LCD. The LCD includes: a display panel including a plurality of pixels defined as a plurality of gate lines and a plurality of data lines cross each other, wherein a storage capacitor of each of the plurality of pixels is connected to a front or rear gate line; a gate driver for generating a gate-on voltage by boosting a first input voltage in multi-stages, the gate-on voltage turns on a switching device of each of the plurality of pixels, and a gate-off voltage that turns off the switching device, and sequentially applying the gate-on voltage and the gate-off voltage to the plurality of gate lines; and a source driver for applying a data voltage to a data line connected to a pixel whose switching device is turned on.
    Type: Application
    Filed: October 25, 2011
    Publication date: July 26, 2012
    Inventors: Doo-In NAM, Yong-Joo Kim, Gyung-Kook Kwak
  • Patent number: 8228279
    Abstract: An electronic device for enhancing image quality of an LCD monitor is utilized for comparing a voltage level of an output indication signal and a voltage level of a residue power when a start indication signal indicates a scan line signal output circuit from an ON state transformation to an OFF state, to output a comparison result to the scan line signal output circuit, so as to prolong time of the scan line signal output circuit driving a panel of the LCD monitor.
    Type: Grant
    Filed: February 16, 2009
    Date of Patent: July 24, 2012
    Assignee: NOVATEK Microelectronics Corp.
    Inventor: Wei-Kang Tsai
  • Patent number: 8223114
    Abstract: A method for displaying a moving image on a display, such that all pixel lines of the display are addressed in each case during image periods for displaying image information, and a backlight for displaying the image information backlights the pixel lines. The display of moving images is enhanced by the fact that the pixel addresses remain unchanged during a first image period and a second image period, following the first image period, for displaying the same image information, and after the first image period, the backlight backlights the pixel lines following a waiting period.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: July 17, 2012
    Assignee: Eizo GmbH
    Inventor: Wolfgang Eckhardt
  • Patent number: 8223106
    Abstract: A driving circuit for a display device includes an input signal generator generating an input signal having one of a plurality of input frequencies corresponding to a respective one of a plurality of operating modes of the display device; a main operating clock generator responsive to the one of the plurality of frequencies to generating a main operating clock, a main frequency of the main operating clock varying in accordance with the one of the plurality of frequencies; and a control signal generator generating a control signal using the main operating clock, wherein the control signal changes in accordance with the main frequency.
    Type: Grant
    Filed: April 17, 2006
    Date of Patent: July 17, 2012
    Assignee: LG Display Co., Ltd.
    Inventor: Jung-Wook Shin
  • Patent number: 8223103
    Abstract: A liquid crystal display device having improved visibility is disclosed. The liquid crystal display, in accordance with an embodiment, includes a liquid crystal panel including a plurality of display blocks, each display block including a plurality of gate lines, a plurality of data lines, and a plurality of pixels coupled to the corresponding gate lines and data lines; a timing controller providing an integration signal including data and a charge share control signal; and a plurality of data-driving chips corresponding to the plurality of display blocks, each of the data-driving chips being coupled to the timing controller in a point-to-point relation, receiving the integration signal, and short-circuiting the plurality of data lines in the corresponding display blocks with one another during charge-share periods, wherein at least two of the plurality of data-driving chips adjust the charge-share periods to be different from each other.
    Type: Grant
    Filed: June 17, 2008
    Date of Patent: July 17, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Bo-ra Kim, Sun-kyu Son
  • Patent number: 8217877
    Abstract: A display device is provided in which a signal line can be shared by a plurality of pixels and data supplied from scan lines can be distributed to a desired pixel selected from the plurality of pixels. The display is characterized in its circuit structure of the plurality of pixels, which allows the signal line to be shared by neighboring three pixels. This circuit structure results in the reduction of the number of signal lines and the simplification of the structure of the signal line driver circuit, which contributes to the reduction of the power consumption and miniaturization of the signal line driver circuit. The detailed structure of the display device is defined in the specification.
    Type: Grant
    Filed: October 10, 2008
    Date of Patent: July 10, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Takahiro Fukutome
  • Patent number: 8217880
    Abstract: In one embodiment of the present invention, when a still image is displayed, applied voltages respectively corresponding to a total of n (n being an integer of not less than 4) types of gradation 0 to (n?1) are outputted to pixels. When a moving image is displayed, an applied voltage corresponding to a predetermined gradation m (1?m?(n?2)) is applied to the pixels instead of applied voltages respectively corresponding to gradations of less than the predetermined gradation m. Overdrive driving is performed with respect to a total of n types of gradation.
    Type: Grant
    Filed: February 7, 2006
    Date of Patent: July 10, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Asahi Yamato, Yuki Kawashima, Kiyoshi Nakagawa, Kohzoh Takahashi, Toshihiro Yanagi
  • Patent number: 8217881
    Abstract: In the display device and the display method of the present invention, a scanning signal line driving circuit controls falls of a scanning signal line, so as to make level shifts occurring to pixel potentials substantially uniform throughout display plane, the level shifts being caused by parasitic capacitances which parasitically exist in scanning signal lines. Fall waveforms of the scanning signal change at a change rate Sx which is a change quantity per unit time, and by desirably setting the change rate Sx, a change rate Sx1 in the vicinity of an input-side end of the scanning signal line and a change rate SxN in the vicinity of the other end thereof are substantially equal to each other, not being influenced by signal delay transmission characteristic which the scanning signal line possesses, like scanning signal line waveforms Vg(1, j) and Vg(N, j).
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: July 10, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Toshihiro Yanagi, Hideki Morii, Hidekazu Miyata
  • Publication number: 20120169687
    Abstract: A liquid crystal display apparatus and a pixel driving method are provided. The liquid crystal display apparatus comprises a pixel array, a scan driving circuit and a data driving circuit. The pixel array comprises a plurality of first pixels, a plurality of second pixels, a plurality of third pixels and a plurality of fourth pixels. The scan driving circuit is configured to activate the first pixels and the fourth pixels sequentially and then activate the second pixels and the third pixels sequentially. The data driving circuit is configured to supply a first polarity data signal when the first pixels and the fourth pixels are activated and supply a second polarity data signal when the second pixels and the third pixels are activated.
    Type: Application
    Filed: October 17, 2011
    Publication date: July 5, 2012
    Applicant: AU OPTRONICS CORP.
    Inventors: Tien-Chin Huang, Chia-Tsung Chaing
  • Patent number: 8212799
    Abstract: An apparatus and method for performing response time compensation. The apparatus described includes a first response time compensation (RTC) module for providing boosted gray level values when transitioning only from a previous gray level of zero to a first current gray level for a color of a pixel of a display. The apparatus also includes a second RTC module for providing boosted gray level values when transitioning from a previous gray level greater than zero to a current gray level for the color of the pixel.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: July 3, 2012
    Assignee: National Semiconductor Corporation
    Inventor: Jonathan Kerwin
  • Patent number: 8212760
    Abstract: A liquid crystal display (LCD) with a driver IC and an LCD panel having source and gate lines. A gate driver is disposed in the LCD panel for sequentially supplying scan signals to the gate lines of the panel. A source driver in the driver IC converts pixel data into an analog source signal and supplies the signal to the source lines. A lookup table is stored with a mapping of possible luminance values for pixels of the LCD panel onto at least one luminance control parameter. The source driver converts the pixel data so that a voltage of the analog source signal increases during a gate scan period depending on the luminance control parameter in such a way that at the end of the gate scan period a voltage at a corresponding pixel electrode is equal to an analog value corresponding to the pixel data.
    Type: Grant
    Filed: July 19, 2007
    Date of Patent: July 3, 2012
    Assignee: Chimei Innolux Corporation
    Inventors: Martin Creusen, Ronald Bartels
  • Patent number: 8207956
    Abstract: The present invention provides a transmission signal generating method for a display device to compensate channel effect. The transmission signal generating method includes using a plurality of signal amplitudes and a first signal direction to generate a plurality of positive levels, using the plurality of signal amplitudes and a second signal direction to generate a plurality of negative levels, and using a plurality of signaling lines for transmission of the pluralities of negative and positive levels. A first positive level and a first negative level both have a minimum signal amplitude of the plurality of signal amplitudes. The amplitude difference of the first positive and negative levels is greater than an amplitude difference of any two neighboring levels of the plurality of negative levels and also the plurality of positive levels.
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: June 26, 2012
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Wen-Chi Lin, Che-Li Lin, Shao-Chung Ho
  • Patent number: 8207926
    Abstract: In one embodiment of the present invention, a liquid crystal display device is disclosed, each pixel includes first and second subpixels, each of which includes a storage capacitor. Storage capacitor counter voltages applied independently to the storage capacitor counter electrodes of the first and second subpixels are varied within each vertical scanning period of the input video signal. As a result, each vertical scanning period of the input video signal includes a first subframe in which the first and second subpixels have luminances Y_SP1_A and Y_SP2_A, respectively, and a second subframe SFB in which the first and second subpixels have luminances Y_SP1_B and Y_SP2_B, respectively, where Y_SP1_A?Y_SP2_A, Y_SP1_B?Y_SP2_B, and Y_SP1_A?Y_SP1_B or Y_SP2_A?Y_SP2_B are satisfied. As a result, the viewing angle dependence of the ? characteristic can be reduced with the decrease in the transmittance of the liquid crystal display device minimized.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: June 26, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Fumikazu Shimoshikiryoh
  • Patent number: 8207928
    Abstract: The invention relates to an active matrix display device comprising a display with a plurality of display pixels, a data input for receiving a data signal and a controller for distributing said data signal over said display pixels to generate an image on said display with an overall brightness value for each display pixel during at least one frame period. The device is adapted to divide said frame period for at least one subset of said display pixels such that said display pixels of said at least one subset have at least a light output at a first non-zero brightness level during a first sub-period of said frame period and at a second non-zero brightness level during a second sub-period of said frame period, the time averaged sum of said brightness levels being substantially equal to said overall brightness level.
    Type: Grant
    Filed: August 20, 2004
    Date of Patent: June 26, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Mark T. Johnson, Nebojsa Fisekovic
  • Publication number: 20120154308
    Abstract: A touch display substrate includes a first data line, a first gate line, a first pixel electrode, a second gate line, a second pixel electrode, a senor data line and a first sensor electrode. The first data line extends along a first direction. The first gate line extends along a second direction. The first pixel electrode is electrically connected to the first data line and the first gate line. The second gate line is substantially parallel with the first gate line. The second pixel electrode is adjacent to the first pixel electrode and electrically connected to the first data line and the second gate line. The sensor data line is adjacent to the second pixel electrode and substantially parallel to the first data line. The first sensor electrode is electrically connected to the sensor data line.
    Type: Application
    Filed: November 18, 2011
    Publication date: June 21, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Sang-Jin JEON, Ho-Kyoon KWON
  • Patent number: 8199141
    Abstract: It is an object to provide a high reliable display device which can suppress the generation of high electric field near the drain of the transistor used as a switching element and a driving method thereof. A relaxation time when charge is stored in the display element of the pixel and other capacitors connected to the display element in parallel is focused on, and the voltage applied between the source and the drain of the transistor in the writing period is suppressed by changing the video signal applied to the signal line step by step and finally setting it at the desired level.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: June 12, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Tatsuya Honda
  • Patent number: 8199091
    Abstract: Gamma voltage conversion device includes a gamma voltage conversion circuit, an amplifier, and a gamma voltage adjusting circuit. The gamma voltage conversion circuit generates a first gamma voltage conformed to a first gamma curve according to a grey level. The amplifier includes a first input end receiving the first gamma voltage, a second end, and an output end. The amplifier outputs the first or a second gamma voltage conformed to a second gamma curve according to the grey level according to the first and the second ends of the amplifier. The gamma voltage adjusting circuit coupled between the second input end and the output end of the amplifier controls the amplifier to output the first or the second gamma voltage as the gamma driving voltage according to the grey level and a gamma curve selection signal.
    Type: Grant
    Filed: February 16, 2009
    Date of Patent: June 12, 2012
    Assignee: AU Optronics Corp.
    Inventors: Ming-Dou Ker, Shao-Chi Chen, Yu-Hsuan Li
  • Patent number: 8199092
    Abstract: An exemplary liquid crystal display includes a common electrode capable of having a predetermined common voltage applied thereto, a first common voltage line connected to the common electrode, a second common voltage line connected to the common electrode, and a common voltage modulator connected to the first and second common voltage lines. The first and second common voltage lines have no overlap and being at opposite sides of the liquid crystal display. The common voltage modulator is configured to receive a distorted common voltage from the common electrode via the first common voltage line, and apply a corresponding compensating voltage to the common electrode via the second common voltage line.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: June 12, 2012
    Assignee: Chimei Innolux Corporation
    Inventor: Hung-Yu Chen
  • Patent number: 8199099
    Abstract: An apparatus and method for driving a liquid crystal display device are disclosed. The apparatus includes a liquid crystal panel with pixels defined by data and gate lines. A gate driver provides different gate pulses to the odd-column pixels than to the even-column pixels. The gate pulses have different voltages and/or widths. Data drivers provide data voltages having a positive or negative polarity to the data lines. A timing controller controls the gate and data drivers and supplies gate clock pulses that have different voltages and/or widths to the gate driver.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: June 12, 2012
    Assignee: LG Display Co., Ltd
    Inventors: Sun Young Kwon, Do Heon Kim, Su Hwan Moon, Ji Eun Chae
  • Patent number: 8193999
    Abstract: A display device includes: a plurality of display panels which each have a plurality of pixels provided in correspondence with intersections of a plurality of scanning lines and a plurality of data lines and a driving circuit supplying image data to the data lines; and a control circuit which controls the driving circuits of the plurality of display panels, wherein panel characteristics of the plurality of display panels are different from each other and one of the plurality of display panels is set to a non-display state, wherein the control circuit includes a precharge circuit supplying a common precharge voltage to the data lines of each of the display panels, and wherein the precharge voltage is set so as to have a voltage value corresponding to the panel characteristic of the display panel set to the non-display state.
    Type: Grant
    Filed: May 13, 2009
    Date of Patent: June 5, 2012
    Assignee: Sony Corporation
    Inventor: Naoyuki Takasaki
  • Publication number: 20120133628
    Abstract: The present invention provides a LCD device including: a timing control unit; an oscillator which is included in the timing control unit and generates a clock frequency; a frequency divider which is included in the timing control unit and reduces the clock frequency supplied from the oscillator by dividing the clock frequency by at least 2; and a mode selection part which is included in the timing control unit and changes at least one driving mode of internal logic circuits by using the divided clock frequency supplied from the frequency divider.
    Type: Application
    Filed: November 29, 2011
    Publication date: May 31, 2012
    Inventors: Minki KIM, Jinsung Kim, Hayoung Ji
  • Publication number: 20120133627
    Abstract: An LCD device is discussed in which a level shifter generates two switching signals, and transmits the generated signals to a gate driver of a liquid crystal display panel by the use of one voltage signal transmitted from a timing controller. The LCD device according to an embodiment includes a liquid crystal display panel in which a gate driver for alternately driving two transistors is formed; a data driver which drives data lines of the liquid crystal display panel; a timing controller which generates one voltage signal for switching the two transistors, and outputs the one voltage signal; and a level shifter which generates two of first and second switching signals to switch the two transistors by using the one voltage signal, and outputs the generated switching signals to the gate driver.
    Type: Application
    Filed: November 9, 2011
    Publication date: May 31, 2012
    Inventors: Myung Kook MOON, Hyun Taek Nam, Jong Woo Kim
  • Patent number: 8188964
    Abstract: A liquid crystal display device is composed of a liquid crystal display panel which includes liquid crystal pixels arranged in a matrix form and each having liquid crystal held between a pixel electrode and a common electrode, scanning lines arranged along the rows of pixels, signal lines arranged along the columns of pixels and pixel switching elements arranged near intersections between the scanning lines and the signal lines and each driven via a corresponding scanning line, and a display control circuit which controls the display panel. The display control circuit is configured to simultaneously drive all of the scanning lines, transition the potentials of the signal lines to a value substantially equal to potential of the common electrode in a state where the scanning lines are driven within a one-frame period, and turn off a power source after a preset period of time required for the transition has elapsed.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: May 29, 2012
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventor: Masayuki Tsuruta
  • Patent number: 8188960
    Abstract: An apparatus for driving a display device includes a plurality of data driving integrated circuits which generates data voltages and a signal controller which inputs a first load signal to a data driving integrated circuit of the plurality of data driving integrated circuits to control the data driving integrated circuit. Each data driving integrated circuit of the plurality of data driving integrated circuits includes a load signal converter which generates a second load signal having a falling time which is different than a falling time of the first load signal.
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: May 29, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Sang-Keun Lee
  • Patent number: 8188898
    Abstract: An integrated circuit includes a digital-to-analog converter (DAC) circuit including at least one first channel type DAC and at least one second channel type DAC. The integrated circuit includes a plurality of sample and hold (S/H) circuits. Each of the S/H circuits is coupled with one of the DAC circuit. The S/H circuits are capable of receiving signals from the DAC circuit and outputting the signals in parallel.
    Type: Grant
    Filed: April 19, 2010
    Date of Patent: May 29, 2012
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Nang-Ping Tu, Fu-Long Hsueh, Mingo Liu, I-Fey Wang
  • Publication number: 20120127142
    Abstract: A liquid crystal display (LCD) ensuring excellent display quality and reducing power consumption is disclosed. The liquid crystal display (LCD) includes first and second polarity image display pixels, such that a polarity inversion of data is executed by line, column, and dot, and the polarity inversion of a common voltage is executed by frame. An inversion driving method using the liquid crystal display (LCD) is also disclosed.
    Type: Application
    Filed: August 18, 2011
    Publication date: May 24, 2012
    Applicant: Samsung Mobile Display Co., Ltd.
    Inventors: Jeong-Geun Yoo, Seung-Jun Lee, Sung-Min Kim
  • Patent number: 8184030
    Abstract: A source driver includes at least a channel, and the channel includes an N-type digital-to-analog converter (NDAC) and an operational amplifier. The NDAC is utilized for receiving input data and selecting one of a plurality of gamma voltages to generate output data according to the input data. The operational amplifier is coupled to the NDAC, and is utilized for amplifying at least the output data to generate an amplified output data. In addition, the channel does not include any P-type digital-to-analog converter.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: May 22, 2012
    Assignee: Himax Technologies Limited
    Inventors: Wei-Kai Tseng, Chin-Tien Chang
  • Patent number: 8184895
    Abstract: A method for magnetic character recognition is disclosed. The method may include preparing a standard waveform that is used as a datum in an operation of reading magnetic ink characters, generating a regeneration waveform from a character string of the magnetic ink characters printed on a surface of an information recording medium, segmenting a character waveform of each of the magnetic ink characters from the regeneration waveform, comparing the character waveform segmented through the segmentation process with the standard waveform, and selecting a plurality of the standard waveforms of candidate characters in accordance with a comparison result of the comparison process. A read character may be identified with the candidate character that has the greatest value among all the coefficient values of coincidence.
    Type: Grant
    Filed: November 21, 2007
    Date of Patent: May 22, 2012
    Assignee: Nidec Sankyo Corporation
    Inventor: Hiroshi Nakamura
  • Patent number: 8184081
    Abstract: A pixel unit, a method for controlling the pixel unit, and a display apparatus having the same are provided. The display apparatus includes a driving circuit and a plurality of pixel units. Each of the pixel unit includes a switch circuit and an energy storage circuit. The energy storage circuit has a first end, a second end, and a third end. The first end is coupled to the switch circuit. The second end is electrically connected to the driving circuit so that the drive circuit is able to provide a first voltage to the second end. The third end is electrically connected to the driving circuit so that the driving circuit is able to provide a second voltage and a third voltage to the third end before the first voltage transits. There is a difference between the second voltage and the third voltage in order to generate a voltage oscillation with in the pixel unit. Therefore, the problem of color washout can be solved.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: May 22, 2012
    Assignee: Au Optronics Corp.
    Inventor: Meng-Chang Tsai
  • Patent number: 8184080
    Abstract: The present invention relates a liquid crystal display. The liquid crystal display includes a liquid crystal panel assembly including a plurality of pixels arranged in a matrix, a gate driver applying gate signals to the pixels for application of data signals to the pixels, a data driver selecting gray voltages corresponding to gray signals and applying the selected gray voltages to the pixels as the data signals, and a signal controller providing the gray signals and control signals for controlling the gray signals for the gate driver and the data driver. The data signals include normal data signals and a black data signal. The data driver alternately applies the normal data signals and the black data signal to the pixels under control of the signal controller. A scanning direction of the normal data signals is opposite in adjacent frames.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: May 22, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jang-Kun Song, Chang-Hun Lee, Hak-Sun Chang
  • Publication number: 20120120040
    Abstract: A drive device includes a plurality of latch circuits provided correspondingly to a plurality of signal lines respectively. A plurality of latch circuits each obtain a plurality of bit data at a time that constitute pixel data and output the plurality of bit data sequentially. A plurality of latch circuits each include a plurality of latch unit circuits arranged in series along the direction in which a plurality of signal lines extend and each configured to obtain one-bit data and transfer the one-bit data.
    Type: Application
    Filed: April 16, 2010
    Publication date: May 17, 2012
    Applicant: SHARP KABUSHIKI KAISHA
    Inventor: Yasuyuki Ogawa
  • Patent number: RE43401
    Abstract: A circuit with a large load driving capability, which is structured by single polarity TFTs, is provided. With a capacitor (154) formed between a gate electrode and an output electrode of a TFT (152), the electric potential of the gate electrode of the TFT (152) is increased by a boot strap and normal output with respect to an input signal is obtained without amplitude attenuation of an output signal due to the TFT threshold value. In addition, a capacitor (155) formed between a gate electrode and an output electrode of a TFT (153) compensates for increasing the electric potential of the gate electrode of the TFT (152), and a larger load driving capability is obtained.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: May 22, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Hiroyuki Miyake, Yutaka Shionoiri