Waveform Generation Patents (Class 345/94)
  • Patent number: 7907107
    Abstract: In one embodiment of the invention, a display device includes a plurality of gate lines transferring gate signals, a plurality of data lines transmitting data voltages, a plurality of storage electrode lines transferring storage signals, and a plurality of pixels arranged in a matrix, each pixel comprising a switching element connected to a gate line and a data line, a liquid crystal capacitor connected to the switching element and a common voltage, and a storage capacitor connected to the switching element and a storage electrode line. The display device may further include a plurality of signal generating circuits generating the storage signals, wherein the signal generating circuit is connected to a k-th storage electrode line, where k is a natural number.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: March 15, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jin Jeon
  • Patent number: 7907110
    Abstract: A display controller for providing signals to a discrete display panel unit comprising: a set of registers configured to hold data to be displayed; a first logic circuitry connected to the set of registers and configured to receive the data from the set of registers, generate the signal waveforms required by the display panel according to the data, and provide the signal waveforms to the display panel; a second logic circuitry connected to the first logic circuitry, the second logic circuitry configured to generate timing signals for timing the first logic circuitry providing the waveforms to the display panel; and a resistor ladder connected to the second logic circuitry, the resistor ladder configured to generate intermediate voltages required to drive the display panel, and configured to receive the timing signals, wherein the controller is configured to automatically and periodically disable the resistor ladder according to one of the timing signals.
    Type: Grant
    Filed: April 4, 2007
    Date of Patent: March 15, 2011
    Assignee: Atmel Corporation
    Inventors: Alain Vergnes, Sebastien Younes, Jerome Alingry
  • Patent number: 7903070
    Abstract: An apparatus for driving a liquid crystal display device comprises a display area which includes a plurality of liquid crystal cells in portions defined by a plurality of gate and data lines; a gate driver which supplies overlapped gate pulses to the adjacent gate lines; a data driver which supplies a data voltage to the data line in synchronization with the gate pulse; and a timing controller which controls an overlapped section of the gate pulses supplied to the adjacent gate lines.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: March 8, 2011
    Assignee: LG Display Co., Ltd.
    Inventors: Su Hwan Moon, Tae Hwan Kim
  • Patent number: 7903071
    Abstract: A driver IC for a display that includes a first D/A converter with a 1st selection circuit that receives 1st image signals and supplies a selected positive divisional voltage to a 1st operational amplifier, which supplies a positive pixel voltage by amplifying the selected positive divisional voltage; a 2nd D/A converter with a 2nd selection circuit that receives 2nd image signals and supplies a selected negative divisional voltage to a 2nd operational amplifier, which supplies a negative pixel voltage by amplifying the selected negative divisional voltage; and a polarity switching switch with 1st and 2nd switches connecting the 1st and 2nd D/A converters respectively, the polarity switching switch being switched to supply each of output terminals corresponding to the 1st and 2nd image signals alternately with the positive and negative pixel voltages every horizontal scan period by activating/inactivating the 1st and 2nd switches in a complementary manner.
    Type: Grant
    Filed: August 6, 2007
    Date of Patent: March 8, 2011
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Hideto Fukuda, Shinya Udo, Masao Kumagai, Osamu Kudo
  • Patent number: 7898514
    Abstract: A liquid crystal display including: a liquid crystal display panel having liquid crystal cells arranged in a matrix defined by data lines and gate lines that cross each other, wherein a thin film transistor is provided in each respective cell adjacent to a crossing of a data line and a gate line for the respective cell; a scanning voltage generator to generate at least two scanning voltages that have different values; a plurality of gate driving integrated circuits to generate scanning pulses using the scanning voltages and to supply the scanning pulse to the gate lines; and a switching circuit to switch the scanning voltages and to apply the scanning voltages to the gate driving integrated circuits.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: March 1, 2011
    Assignee: LG Display Co., Ltd.
    Inventor: Sang Rae Kim
  • Patent number: 7893908
    Abstract: A liquid crystal display device includes a liquid crystal panel including a plurality of liquid crystal cells, a common voltage generation circuit that supplies a common voltage to the liquid crystal panel, a liquid crystal drive circuit that implements control for supplying the plurality of liquid crystal cells with voltage that accords with a video signal to display an image on the liquid crystal panel, and for reversing a polarity of the voltage supplied to the plurality of liquid crystal cells, and an adjustment module that stores characteristics data for correcting fluctuations in brightness and, based on the characteristics data, adjusts the brightness of the image displayed on the liquid crystal panel.
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: February 22, 2011
    Assignee: NEC Display Solutions, Ltd.
    Inventors: Takeshi Morimoto, Reiichi Kobayashi
  • Patent number: 7893907
    Abstract: An the driving method and apparatus including a liquid crystal display panel provided with a plurality of data lines; a brightness detector to detect a black brightness component and a white brightness component of data supplied to the plurality of data lines; a controller to compare magnitudes of a black brightness amount and a white brightness amount in the white and black brightness components detected by the brightness detector to generate a compared result and to control an application of a common voltage on a basis of a black brightness data level or a white brightness data level of data supplied to the plurality of data lines in accordance with the compared result; and a common voltage generator to generate a common voltage having an application level instructed by the controller and to supply the common voltage to the liquid crystal display panel.
    Type: Grant
    Filed: June 19, 2006
    Date of Patent: February 22, 2011
    Assignee: LG Display Co., Ltd.
    Inventor: Eun Kyeong Kang
  • Patent number: 7884790
    Abstract: A digital driving display device to make gradation display by pulse width modulation includes: a pixel array unit arranging pixels having an electrooptic element and incorporating a memory in a matrix, disposing a scanning line for each row in a pixel arrangement in the matrix, and a signal line for each column; a horizontal driving section inputting display data in a block for each scanning line having a low to a high gradation level subfield for each bit of the data defining gradation levels of the pixels and in a period for weight of the bit, sampling-latching, sequentially transferring, and supplying the data to the signal line; and a vertical driving section selecting and scanning pixels of the pixel array unit in a row and performing scanning while jumping rows to write the data supplied in the block from the horizontal driving section to pixels of the pixel array unit.
    Type: Grant
    Filed: June 8, 2006
    Date of Patent: February 8, 2011
    Assignee: Sony Corporation
    Inventor: Hiroyuki Sakurai
  • Patent number: 7884792
    Abstract: A method of extracting an optimized digital variable resistor (“DVR”) value of a display panel, the method including varying a DVR value, corresponding to a common voltage, and applying the varied DVR values to the display panel, measuring brightness values of the display panel for at least two frames, extracting flicker values corresponding to the varied DVR values using the brightness values, and extracting an optimized DVR value by generating first to third coordinate values in which coordinate values have x-coordinate values and y-coordinate values representing DVR values and flicker values, respectively, calculating a first linear function of a first straight line connecting two of the coordinate values, and a second linear function of a second straight line using the first linear function and the other of the coordinate values, and extracting an x-coordinate value at an intersection point of the first and second lines, as the optimized DVR value.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: February 8, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kwan-Young Oh, Seung-Woo Lee, Jae-Ho Oh
  • Patent number: 7880713
    Abstract: A method of increasing efficiency of video display includes receiving a first frame signal, where the first frame signal includes a first blank signal and a first image data, where the first blank signal includes a first sync signal, a first front-porch signal and a first back-porch signal. The method also includes separating the first blank signal and the first image data, performing image processing for the first image data for generating a second image data, and adding a second blank signal to the second image data for generating a second frame signal, where the second blank signal includes a second sync signal, a second front-porch signal and a second back-porch signal.
    Type: Grant
    Filed: October 15, 2007
    Date of Patent: February 1, 2011
    Assignee: Qiada Corporation
    Inventor: Pei-Chang Lee
  • Patent number: 7872628
    Abstract: A shift register and an LCD device to prevent the deterioration of a transistor by controlling a bias stress are disclosed. The shift register includes a plurality of stages for sequential shift signals, wherein each of the plurality of stages is connected with first and second supplying voltage input lines having opposite phases inversed by at least every frame, a start pulse input line, and at least one clock signal input line in which a phase of a first logic state is shifted in sequence, and a clock signal inputted to the clock signal input line is maintained in a second logic state different from the first logic state during a blanking time between frames.
    Type: Grant
    Filed: December 6, 2005
    Date of Patent: January 18, 2011
    Assignee: LG Display Co., Ltd.
    Inventor: Nam Wook Cho
  • Patent number: 7864150
    Abstract: A driving method for a liquid crystal display is provided. A pre-charge voltage value is applied to a scan line, where the voltage level does not manage to turn on the thin film transistor of the associated pixel, before a scan signal is applied to the scan line of the liquid crystal display. The pre-charge voltage level is electrically connected to the pixel voltage of the scan line via a storage capacitor to the neighboring pixel.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: January 4, 2011
    Assignee: Hannstar Display Corporation
    Inventor: Po-Sheng Shih
  • Patent number: 7859503
    Abstract: In driving a liquid crystal display device having an alignment regulating structure for regulating liquid crystal, when the display state of the pixel is to be changed from a dark display to a bright display, a difference between the magnitude of a voltage Vd4 applied to the liquid crystal of the pixel at the beginning of the first frame and the magnitude of a voltage Vd3 applied to the liquid crystal of the pixel in the second frame or a subsequent frame, is set to be greater than a voltage Vod that decreases in the first frame due to an increase in the liquid crystal capacitance of the pixel.
    Type: Grant
    Filed: February 16, 2005
    Date of Patent: December 28, 2010
    Assignees: Fujitsu Limited, Au Optronics Corporation
    Inventors: Takahiro Sasaki, Yuichi Inoue, Mikio Oshiro, Kenko Honda
  • Patent number: 7859497
    Abstract: An apparatus and method for driving an LCD device is provided. The apparatus for driving an LCD device comprises an image display unit that includes liquid crystal cells formed in each region defined by a plurality of gate lines and a plurality of data lines. A data driver supplies analog video signals to the respective data lines. A gate driver supplies scan pulses to the respective gate lines. A data converter detects motion vectors from input data and generating modulated data by filtering the input data in accordance with the motion vectors to generate overshoot or undershoot in a boundary along a motion direction. A timing controller aligns the modulated data to supply the aligned data to the data driver and operates the data driver and the gate driver.
    Type: Grant
    Filed: June 27, 2006
    Date of Patent: December 28, 2010
    Assignee: LG. Display Co., Ltd.
    Inventors: Nam Yong Kong, Tae Ho You
  • Patent number: 7859527
    Abstract: A reference voltage line is synchronously scanned with scanning of a scanning signal line, voltage of the reference voltage line is set to be the voltage of a common electrode, the second transistor is set to be OFF state during the reference voltage line is set in the common voltage for a pixel wherein a node between an image signal memory and said second transistor is set in a voltage so that said second transistor becomes OFF and the voltage of image signal line is set to be high voltage level when the voltage of the scanning signal line changes from low voltage level to high voltage level for the pixel wherein the node between the image signal memory and the second transistor is set in a voltage so that said second transistor becomes ON.
    Type: Grant
    Filed: September 21, 2004
    Date of Patent: December 28, 2010
    Assignee: Hitachi Displays, Ltd.
    Inventors: Shoichi Hirota, Susumu Edo, Hiroki Kaneko, Tetsuya Oshima, Tatsuya Sugita, Shinichi Komura, Katsuyuki Funahata
  • Patent number: 7859506
    Abstract: A mobile LCD device controls a common voltage signal VCOM to effectively display a landscape mode image instead of using a separate integrated chip (IC). The LCD device utilizes a method of displaying a landscape mode image including selecting a video frame from M video frames received from an external source where M is greater than or equal to 2. The selected video frame is stored in a video memory. The selected video frame is masked so as not to display the selected video frame while the selected video frame is stored. The stored video frame is displayed a predetermined number of times while the selected video frame is not stored thereby effectively displaying the landscape mode image.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: December 28, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Won-Sik Kang, Jong-Kon Bae
  • Publication number: 20100321358
    Abstract: A liquid crystal display replaces the common electrodes of a conventional LCD with a plurality of switch electrodes. The plurality of switch electrodes is grouped into several switch electrode sets. Each of the switch electrode sets' potential is modulated by a different driving circuit. The driving circuits can also separately modulate the potentials of the switch electrode sets according to the scanning sequence of the LCD.
    Type: Application
    Filed: August 12, 2010
    Publication date: December 23, 2010
    Applicant: HANNSTAR DISPLAY CORPORATION
    Inventors: Seok Lyul Lee, Po Sheng Shih
  • Patent number: 7855707
    Abstract: A liquid crystal display device includes: a liquid crystal panel; a horizontal sync signal having a horizontal period; a gate driver that supplies a plurality of gate signals sequentially to a plurality of gate lines, wherein a first gate line provides a gate signal with a gate pulsewidth equal to the horizontal period +? and a second gate line provides a gate signal with a gate pulsewidth equal to the horizontal period +? so that gates signals on the first and second gate lines overlay by 2? and wherein the first and second gate lines are adjacent to one another; and a data driver that supplies pixel data signals to a plurality of data lines on the liquid crystal panel during every period of the horizontal sync signals.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: December 21, 2010
    Assignee: LG Display Co., Ltd.
    Inventors: Jea Seok Park, Yong Ju Jeon
  • Publication number: 20100315321
    Abstract: A liquid crystal display (LCD) panel and a method for driving pixels thereof are provided. The present invention uses a fixed voltage generated by a charge-sharing unit to perform charge-sharing with a second sub-pixel in a pixel, so as to make that the brightness of a second bright region corresponding to the second sub-pixel is darker than the brightness of a first bright region corresponding to a first sub-pixel in the pixel. Accordingly, the present invention can achieve the purpose of gray-levels space stacking without adding additional data lines and thus improving the color washout phenomenon of the LCD.
    Type: Application
    Filed: September 29, 2009
    Publication date: December 16, 2010
    Applicant: AU OPTRONICS CORPORATION
    Inventors: Chun-Wei Huang, Pei-Yi Chen
  • Patent number: 7852313
    Abstract: A display device comprises a light source consisting of three emission elements, each of which emits light of different wavelength regions corresponding to the respective colors of red, green and blue, and a display module consisting of a display part wherein each pixel has two types of color filters that transmit red and green light and green and blue light, respectively. One frame of video signals is split during display to become two subframes and it is possible to alternately emit for each subframe green light, which is transmitted through both color filters, and red and blue light, each of which is transmitted through only one filter.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: December 14, 2010
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventor: Nobutoshi Sekiguchi
  • Publication number: 20100309230
    Abstract: A light emitting device and a method of driving capable of reducing or preventing motion blur and flicker phenomena. The light emitting device includes: scan lines; light emitting pixels configured to provide light to a liquid crystal pixel, each of the scan lines being applied with first and second scan signals for a frame period; and a partial brightness controller is configured to generate a synchronous signal and a segment detection signal, the synchronous signal and the segment detector signal being for controlling application time points of the first and second scan signals according to a liquid crystal response speed on an operation mode basis of the crystal pixel. The first scan signal is applied at a time point at which liquid crystal arrangement of crystal pixel starts to be sustained, and the second scan signal is applied within a time period in which the liquid crystal arrangement is sustained.
    Type: Application
    Filed: November 24, 2009
    Publication date: December 9, 2010
    Inventor: Duck-Gu Cho
  • Publication number: 20100309183
    Abstract: A liquid crystal display includes liquid crystal elements in which a liquid crystal layer is sandwiched by a first electrode and a second electrode, a driving circuit configured to alternately apply higher and lower voltages than a predetermined voltage to the first electrode, and, at the same time, to apply the predetermined voltage to the second electrode, and a control circuit configured to compare a first current with a second current, the first current being obtained by excluding an instantaneous current due to a related higher voltage from currents flowing through the second electrode after the higher voltage is applied to the first electrode, and the second current being obtained by excluding an instantaneous current due to a related lower voltage from currents flowing through the second electrode after the lower voltage is applied to the first electrode, and to control the predetermined voltage based on the comparison result.
    Type: Application
    Filed: June 3, 2010
    Publication date: December 9, 2010
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Kazuhisa MIZUSAKO
  • Patent number: 7847774
    Abstract: A pixel driving circuit of an active matrix organic light emitted diode display is provided with an input first scanning voltage signal and an input displaying voltage signal. The pixel driving circuit comprises a driving thin film transistor (TFT), an organic light emitted diode (OLED), and a capacitor. The capacitor has a first end connected to a gate electrode of the driving TFT to store a potential respect to the displaying voltage signal and having the driving TFT generate a steady current flowing through the OLED. The capacitor has a second end provided with a second scanning voltage signal, which has a level range larger than that of the displaying voltage signal, partially overlapping with the first scanning voltage signal so as to generate a negative bias in the driving TFT.
    Type: Grant
    Filed: February 11, 2005
    Date of Patent: December 7, 2010
    Assignee: AU Optronics Corporation
    Inventor: Yi-Cheng Chang
  • Patent number: 7843419
    Abstract: The present invention provides a transflective LCD including a plurality of pixel units defined by scan lines and data lines. Each pixel unit includes two sub-pixels. Each sub-pixel includes a storage capacitor. The two storage capacitors are connected to different voltage sources and correspond to a reflection region and a transmission region in a pixel unit respectively to modify the pixel voltage.
    Type: Grant
    Filed: November 17, 2006
    Date of Patent: November 30, 2010
    Assignee: Hannstar Display Corporation
    Inventors: Po-Yang Chen, Po-Sheng Shih
  • Patent number: 7843447
    Abstract: In a liquid crystal display device having a feedback circuit part, the feedback circuit part prevents black points and blinking pixels from being generated on a liquid crystal display panel by compensating ripple voltages generated from a common electrode of a common substrate. The feedback circuit part comprises a negative feedback part, a buffer part, a low-pass filter part, and first and second impedances interconnecting the low-pass filter part and the negative feedback part.
    Type: Grant
    Filed: January 4, 2006
    Date of Patent: November 30, 2010
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventor: Takeshi Okuno
  • Publication number: 20100289785
    Abstract: In one embodiment of the present invention, a display apparatus includes a liquid crystal display panel including: video signal lines to supply a data signal; scanning signal lines provided so as to intersect the video signal lines; and pixel electrodes provided at intersections of the video signal lines and the scanning signal lines via switching elements, respectively; and a scanning signal line drive circuit for supplying a scanning signal to each of the scanning signal lines. The display apparatus further includes a slope generating circuit which generates a falling slope signal in accordance with the signal delay transfer characteristic of the scanning signal lines, determined by the length of the display panel. The falling slope signal controls a scanning signal so that the scanning signal has a substantially equal slope at its fall regardless of its position on each scanning signal line. The falling slope signal is supplied to the scanning signal line drive circuit.
    Type: Application
    Filed: May 11, 2007
    Publication date: November 18, 2010
    Inventor: Daiichi Sawabe
  • Publication number: 20100289786
    Abstract: A liquid crystal display device includes a display portion having a first substrate, a second substrate opposing to the first substrate, a liquid crystal layer held between the first and second substrates, and a plurality of pixels arranged in a delta shape. A plurality of pixel electrodes are respectively connected to signal lines extending in a first direction via a switch. The switch is controlled by scanning lines extending in a second direction which orthogonally crosses the first direction. The signal lines extend in a space between the pixel electrodes in a meandering shape in the second direction, and two kinds of color pixels are connected with a common signal line in turn via the pixel switch.
    Type: Application
    Filed: April 30, 2010
    Publication date: November 18, 2010
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Yukio TANAKA, Tetsuo Fukami, Emi Higano, Shigesumi Araki, Ken Shiiba
  • Publication number: 20100289792
    Abstract: A method for driving a tri-gate TFT-LCD includes providing a polarity converting common voltage. When polarity of the common voltage is converted, a first gate line is turned on for a source line to charge a first sub-pixel for a first write in duration. When the first gate line is turned off, a second gate line is turned on for the source line to charge a second sub-pixel for a second write in duration. When the second gate line is turned off, a third gate line is turned on for the source line to charge a third sub-pixel for the second write in duration. By adjusting the first write in duration the first sub-pixel can be fully charged, consequently improving the color deviation of the displayed image.
    Type: Application
    Filed: August 2, 2009
    Publication date: November 18, 2010
    Inventors: Yuan-Yi Liao, Chao-Hui Hsu, Liang-Ming Yu
  • Patent number: 7834823
    Abstract: A display apparatus, comprising a pixel array section and a drive section that drives the pixel array section, wherein the pixel array section includes first scanning lines and second scanning lines arranged in rows, signals lines arranged in columns, pixels that are provided where the first scanning lines, the second scanning lines, and the signal lines meet and that are arranged in rows and columns, a power line that supplies power to each of the pixels, and an earth line. The drive section includes a first scanner that sequentially line scans the pixels in rows by sequentially supplying a first control signal to each of the first scanning lines, a second scanner that sequentially supplies a second control signal to each of the second scanning lines in conjunction with the sequential line scanning, and a signal selector that supplies a video signal to the columns of signal lines in conjunction with the sequential line scanning.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: November 16, 2010
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Junichi Yamashita, Naobumi Toyomura, Hideo Kataoka
  • Publication number: 20100277461
    Abstract: In various embodiments, the largest transition in the select waveform of successive approximation technique is eliminated to reduce power dissipation in liquid crystal displays. Power dissipation in the driver circuit is analyzed for gray scale images for several select sequences. They are compared and new select sequences are proposed to achieve low power dissipation. A combination of pulse width modulation for MSBs and pulse height modulation for LSBs to form discrete trapezoidal waveforms is used to reduce peak amplitude of select and data waveforms and achieve a low supply voltage and low power dissipation in the driver circuit.
    Type: Application
    Filed: June 17, 2009
    Publication date: November 4, 2010
    Applicant: Raman Research Institute
    Inventor: T. N. Ruckmongathan
  • Publication number: 20100277399
    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: Application
    Filed: November 12, 2009
    Publication date: November 4, 2010
    Inventors: Hui-Lung Yu, Chih-Yuan Chien, Ming-Yen Lin
  • Patent number: 7821480
    Abstract: A charge transfer circuit of a liquid crystal display includes at least one inductive element connectable between first and second common terminals, to a first and to a second groups of lines of the display, respectively.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: October 26, 2010
    Assignee: STMicroelectronics SA
    Inventors: Benoît Peron, Francis Cuellar
  • Patent number: 7817213
    Abstract: Sequentially performed are (1) an entire liquid crystal layer is initialized into a focal conic state, (2) an image is written onto the liquid crystal device by scanning with selecting exposure or non-exposure while applying a voltage that does not exceed a threshold value for a state change from the focal conic state to a homeotropic state during the non-exposure but exceeds the threshold value during the exposure and that causes the focal conic state and the homeotropic state to be bi-stable after the exposure, and (3) the application of the voltage is stopped to change a state of a portion, of which the state has changed to the homeotropic state, to the planer state. In (2), an electric field energy applied to an exposure portion of the liquid crystal layer is controlled to gradually increase from a start to an end of the series of scanning actions.
    Type: Grant
    Filed: October 8, 2008
    Date of Patent: October 19, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Haruo Harada, Yasunori Okano, Chisato Urano, Hiroshi Arisawa, Makoto Gomyo, Taijyu Gan, Yasuhiro Yamaguchi, Tomozumi Uesaka
  • Patent number: 7817125
    Abstract: In a display device in which each pixel includes a thin film transistor which is turned on in response to a scanning signal from a gate signal line, and an electrode to which a video signal from a drain signal line is supplied through the thin film transistor, the scanning signal allows a voltage level thereof which turns on the thin film transistor to have a valley portion which decreases the voltage level in a midst portion thereof, and the decreased voltage level of the valley portion is set to a value which is equal to or more than a voltage level which turns off the thin film transistor.
    Type: Grant
    Filed: February 9, 2006
    Date of Patent: October 19, 2010
    Assignee: Hitachi Displays, Ltd.
    Inventors: Kikuo Ono, Yoshihiro Imajo
  • Patent number: 7817124
    Abstract: A liquid crystal display panel includes a plurality of sub-pixels, a plurality of thin film transistors, a plurality of data lines, and a plurality of gate lines. Each of the sub-pixels have first and second gray scale regions which are split up and down and have different areas, the first and second gray scale regions of one sub-pixel having a staggered arrangement with respect to those of an adjacent sub-pixel. Thin film transistors are connected to the first and second gray scale regions so that the first gray scale regions are driven when one of gate lines is driven and the second gray scale regions are driven when another gate line is driven.
    Type: Grant
    Filed: September 19, 2006
    Date of Patent: October 19, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyoung Ju Shin, Hak Sun Chang, Yeon Ju Kim, Seung Hoo Yoo, Hyun Wuk Kim, Hee Wook Do
  • Patent number: 7812803
    Abstract: The present invention relates to a driving method for cholesteric liquid crystal display. A plurality of pixels of the display are controlled by a plurality of row drivers and a plurality of column drivers. According to the method of the invention, firstly, a DC input voltage or a non-symmetric AC input voltage is applied to the row drivers and the column drivers so that the voltage of the pixel is larger than a withstand voltage of the drivers. Then, an initial column signal and an initial row signal are respectively supplied by the corresponding column driver and row driver so as to initialize the corresponding pixel. The polarity of the initial column signal is different from that of the initial row signal. Because the initial row signal minus the initial column signal equals the signal of the pixel, the amplitude of the signal applied to the pixel can be increased.
    Type: Grant
    Filed: June 8, 2007
    Date of Patent: October 12, 2010
    Assignee: Himax Technologies, Inc.
    Inventors: Yen-Chen Chen, Chien-Pin Chen, Chia-Cheng Lai
  • Patent number: 7804473
    Abstract: A method of operating a liquid crystal display device includes: (A) time-divisionally driving pixels in a certain line of an LCD panel so that pixels adjacent in a horizontal direction are driven with data signals of opposite polarities. The (A) step includes: (A1) generating a first data signal of a first polarity on a first output terminal of a driver, and then driving a first pixel out of said pixels in the certain line through electrically connecting the first output terminal to the first pixel; and (A2) generating a second data signal of the first polarity on the first output terminal and then driving a second pixel out of said pixels in the certain line through electrically connecting the first output terminal to the second pixel, in succession to the drive of the first pixel.
    Type: Grant
    Filed: November 20, 2006
    Date of Patent: September 28, 2010
    Assignee: NEC Electronics Corporation
    Inventor: Masayuki Kumeta
  • Patent number: 7804472
    Abstract: There is provide a low cost liquid display panel with high image quality, the liquid crystal display in which temperature compensation is unnecessary and image quality is not affected by temperature changes of the surrounding environment. In the active matrix cholesteric liquid crystal display panel, the time Tw for applying voltage to the liquid crystal layer at the time of image writing is set so that the variation ?Vs depending on temperature of the writing voltage which makes the liquid crystal layer to show approximate 50% of the maximum reflectance is less than or equal to a predetermined value within a predetermined temperature range.
    Type: Grant
    Filed: September 5, 2006
    Date of Patent: September 28, 2010
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Masakazu Okada, Mitsuyoshi Miyai
  • Patent number: 7800570
    Abstract: An LCD device is disclosed in which the LCD device is driven in an FFS mode and a VAC mode during a frame frequency period to obtain a narrow viewing angle. The method for driving the LCD device includes driving the LCD device in an FFS mode during a frame frequency period to obtain a wide viewing angle, and driving the LCD device in both the FFS mode and a VAC mode during the frame frequency period by dividing the frame frequency period, thereby obtaining a narrow viewing angle.
    Type: Grant
    Filed: June 29, 2006
    Date of Patent: September 21, 2010
    Assignee: LG. Display Co., Ltd.
    Inventors: Hyun Suk Jin, Hyung Seok Jang
  • Patent number: 7791577
    Abstract: Each pixel includes first and second subpixels with different luminances. Each subpixel includes a liquid crystal capacitor and a storage capacitor. The storage capacitor counter electrodes of the subpixels (such as those of the first subpixel of an arbitrary pixel and the second subpixel of a vertically adjacent pixel) are electrically independent. A storage capacitor counter voltage supplied through each storage capacitor trunk has a first period (A) with a first waveform and a second period (B) with a second waveform within one vertical scanning period (V-Total) of an input video signal, where V-Total=A+B. The first waveform oscillates between first and second voltage levels in a first cycle time PA, which is an integral number of times, and at least twice, as long as one horizontal scanning period (H).
    Type: Grant
    Filed: December 27, 2005
    Date of Patent: September 7, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masae Kitayama, Fumikazu Shimoshikiryoh
  • Patent number: 7786968
    Abstract: An output pulse of a flip flop is delayed in a delay inverter circuit before supplied to an input terminal of a level shifter. Then, an output pulse of the next stage flip flop is supplied to a reset terminal of the first flip flop and also to an enable terminal of the level shifter. Further, the level shifter output a sampling pulse with a beginning end equal to the beginning end of the pulse supplied to the input terminal and a terminal and equal to the beginning and of the pulse supplied to the enable terminal. With this arrangement, the subject invention provides a pulse output circuit, a driving circuit for a display device using the pulse output circuit, a display device and a pulse output method, that reduce delay of the terminal end of the pulse in sequentially outputting pulses from plural output terminals.
    Type: Grant
    Filed: December 3, 2004
    Date of Patent: August 31, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Makoto Yokoyama, Hajime Washio, Yuhichiroh Murakami, Kenji Hyoudou, Hiroshi Murofushi
  • Patent number: 7786969
    Abstract: In an OCB liquid crystal display device, a gradation voltage of a video signal is set to be lower than a black display optimum voltage, and a reverse transition prevention voltage is set to be higher than the black display optimum voltage and to be lower than a maximum applied voltage, and as the gradation voltage of the video signal becomes low, the reverse transition prevention voltage is set to be high.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: August 31, 2010
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Shigesumi Araki, Kazuhiro Nishiyama, Mitsutaka Okita, Daiichi Suzuki
  • Publication number: 20100214204
    Abstract: An LCD with power consumption reduction and a method of driving the same. In one embodiment, the LCD has a plurality of pixels spatially arranged in the form of a matrix having N pixel rows, each pixel row defined between two neighboring scanning lines Gn and Gn+1, and having an auxiliary common electrode, and a plurality of common voltage driving circuits, each common voltage driving circuit electrically coupled between the scanning line Gn and the corresponding auxiliary common electrode for providing a two-level lift-up coupling voltage to the auxiliary common electrode.
    Type: Application
    Filed: February 25, 2009
    Publication date: August 26, 2010
    Applicant: AU Optronics Corporation
    Inventors: Kuohao Fanchiang, Kung-Yi Chan, Huan-Hsin Li
  • Patent number: 7782311
    Abstract: Using technology which uses a single shift register and simultaneously generates multiple pulses, this invention is a liquid crystal display device which rapidly drives data lines. It is possible to increase the frequency of the shift register output signal without changing the frequency of the shift register operation clock. If the shift register output signals, by means of analog switches, are used to determine the video signal sampling timing, high speed data line driving can be realized. Additionally, if the output signals of the shift register mentioned above are used to determine the video signal latch timing in a digital driver, high speed latching of the video signal can be realized. Consequently, even if the driving circuits of the liquid crystal display matrix are composed of TFTs, high speed operation of the driving circuits is possible without increasing power consumption. The shift register can also be used to inspect the electrical characteristics of the data lines and analog switches.
    Type: Grant
    Filed: January 8, 2007
    Date of Patent: August 24, 2010
    Assignee: Seiko Epson Corporation
    Inventor: Seiichiro Higashi
  • Patent number: 7782289
    Abstract: A timing controller including a memory and a memory controller is provided. The memory includes an odd-field block and an even-field block. The memory controller is coupled to the memory and controls the memory. When two of a first, a second and a third gate output enable signals output by the timing controller are active, the memory is controlled to output the data of the (I?1)th scan line stored in the odd-field block. When one of the first, the second and the third gate output enable signals output by the timing controller is active, and the other two signals are inactive, the memory is controlled to output the data of Jth scan line stored in the even-field block and write an odd-field field data of the (J+1)th scan line to the odd-field block and write an even-field field data of the (J+1)th scan line to the even-field block.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: August 24, 2010
    Assignee: Au Optronics Corporation
    Inventors: Kuo-Liang Shen, Chien-Yu Yi
  • Publication number: 20100201665
    Abstract: The general field of the invention is that of display devices comprising a liquid-crystal matrix screen composed of elementary pixels, said screen comprising at least a first electrode used as voltage reference and called the “backplane”, a second electrode in the form of a matrix electronic network delivering the drive voltages for controlling the pixels and control electronics for said electrodes, said screen being used in the so-called “normally black” mode, that is to say that in the absence of applied voltages, the optical transmission of the pixels is substantially zero. In the device according to the invention, the “backplane” drive voltage is a variable periodic voltage, the amplitude of variation of this voltage being sufficient so that in the absence of voltage on the second electrode, the optical transmission of the pixels is sufficient to be detected by an observer.
    Type: Application
    Filed: August 25, 2008
    Publication date: August 12, 2010
    Applicant: THALES
    Inventors: Philippe Airault, Laurent Canal, Gerard Voisin
  • Patent number: 7773084
    Abstract: In the present invention, during an 1H period excluding a blanking period (1HB) constituting a line display period, pixel data pulses of RGB (61B to 61R) are successively supplied for each color to corresponding signal lines for the color display of one pixel line. A control circuit (40) of select switches connected to the signal lines (6-1 to 6-n) supplies permission pulses (63B to 63R) for the supply of data to signal lines when displaying one color among RGB to select switches (TMG), and turns on the select switch (TMG) of the signal line corresponding to another color to be displayed later in the same line display period during the period of this application by a precharge pulse (62G or 62R) having a time duration shorter than the supply time of the pixel data of the other color (T2 or T3) to previously precharge the signal line of the other color to the predetermined potential.
    Type: Grant
    Filed: August 20, 2004
    Date of Patent: August 10, 2010
    Assignee: Sony Corporation
    Inventors: Naoyuki Itakura, Hiroaki Ichikawa, Toshikazu Maekawa
  • Publication number: 20100194734
    Abstract: An integrated circuit device includes: a data line driving circuit that is provided for each of a plurality of data signal supply lines and supplies a multiplexed data signal to a corresponding data signal supply line among the plurality of data signal supply lines; a pattern output circuit; and an order setting circuit, wherein a plurality of data signals after demultiplexing obtained by demultiplexing the multiplexed data signal by a demultiplexer are supplied to a plurality of pixels in one horizontal scanning period, the pattern output circuit outputs, as an output rotation pattern, at each frame or each set of plural frames, one of first rotation pattern—M-th (M is a natural number of 2 or more) rotation pattern, which are rotation patterns each defining an order of driving first pixel—p-th (p is a natural number of 2 or more) pixel among the plurality of pixels.
    Type: Application
    Filed: January 29, 2010
    Publication date: August 5, 2010
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Akira MORITA
  • Patent number: 7768582
    Abstract: A liquid crystal display comprises a first substrate having a pixel electrode, a second substrate adjacent to the first substrate and having a common electrode, and a liquid crystal layer disposed between the first substrate and the second substrate, wherein a black voltage applied to the pixel electrode is in a range of from about 3V to about 4.4V and a perpendicular direction dielectric constant ?? of liquid crystals in the liquid crystal layer is greater than or equal to about 0.27 times of a horizontal direction dielectric constant ?? of the liquid crystals.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: August 3, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Il-Kook Huh, Seung-Hoo Yoo, Eun-Hee Han, Byeong-Seob Ban
  • Patent number: 7768488
    Abstract: A liquid crystal display device afflicted with no image persistence is disclosed. The liquid crystal display device according to the present invention comprises a pixel portion in which a plurality of pixel TFTs are matrix-wise disposed, a source driver and a gate driver which feed a plurality of the TFTs with picture signals, and a liquid crystal material which has substantially no threshold value, characterized in that one frame is formed of a plurality of sub-frames, and, during at least one of a plurality of the sub-frames, the display by a reset signal is performed.
    Type: Grant
    Filed: July 7, 2006
    Date of Patent: August 3, 2010
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Shunpei Yamazaki