Waveform Generation Patents (Class 345/94)
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Patent number: 8054272Abstract: A display apparatus includes a gate driver, a data driver, a display panel, a power supply and a common voltage line. The gate driver outputs a gate signal, and the data driver outputs a data signal. The display panel includes a display area displaying images in response to the gate signal and the data signal, and a peripheral area surrounding the display area. The power supply generates a common voltage and supplies the common voltage to the display panel. The common voltage line is disposed in the peripheral area surrounding the display area. and the common voltage line has two ends adjacent to the power supply. One of the two ends, which is disposed farther away from the gate driver, is connected to the power supply to receive the common voltage. Accordingly, the common voltage is differentially applied according to a length of the common voltage line.Type: GrantFiled: March 26, 2009Date of Patent: November 8, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Chang-Soo Lee, Yu-Han Bae
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Patent number: 8054273Abstract: Provided is an electro-optical device including: a display unit including a plurality of display areas in which pixels are arranged; common electrodes provided in correspondence with the plurality of display areas; pixel electrodes provided in correspondence with the pixels and facing the common electrodes with an electro-optical material interposed therebetween; a driving control unit which controls writing of an image signal to the pixel electrode in each of the plurality of display areas; and a voltage applying control unit which controls applying of a predetermined voltage to the common electrode in each of the plurality of display areas; wherein the driving control unit is configured to stop the writing of the image signal to the pixel electrode during a predetermined period in a period close to at least one of a start time point or an end time point of the applying of the predetermined voltage, when the predetermined voltage is applied to the common electrode of the display area adjacent to one displayType: GrantFiled: April 23, 2009Date of Patent: November 8, 2011Assignee: Sony CorporationInventor: Toshihiko Tanaka
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Patent number: 8054321Abstract: A display device includes a data modulator for analyzing a gray level of input data, modulating the input data in accordance with the analyzation result, and inserting one of black data and white data along with the modulated data, and a driver for supplying modulation data from the data modulator and the one of black data and white data to a display panel.Type: GrantFiled: June 20, 2006Date of Patent: November 8, 2011Assignee: LG Display Co., Ltd.Inventors: Nam Wook Cho, Sung Hak Jo, Dong Woo Kim
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Patent number: 8054271Abstract: The invention provides methods of driving a pixel and liquid crystal display panels implementing the methods. The invention generates an ideal data voltage corresponding to a gray level of the pixel, and generates a compensated data voltage corresponding to the gray level according to a polarity change of the pixel. The charging period of the pixel is divided into a first charging time segment and a second charging time segment. The invention charges the pixel by the compensated data voltage during the first charging time segment, and charges the pixel by the compensated data voltage during the second charging time segment.Type: GrantFiled: June 18, 2007Date of Patent: November 8, 2011Assignee: Hannstar Display Corp.Inventors: Hsuan-Lin Pan, Po-Sheng Shih
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Patent number: 8044914Abstract: A method and apparatus of compensating for a kick-back voltage to reduce the generation of flicker in a liquid crystal display (LCD). The method of compensating for a kick-back voltage includes correcting input pixel data using a kick-back correction function that meets a condition on which a response characteristic of a voltage detected from a pixel electrode of a liquid crystal cell for a positive input pixel signal and a response characteristic of a voltage detected from the pixel electrode of the liquid crystal cell for a negative input pixel signal become symmetrical without causing a saturation state on a basis of a kick-back voltage measured from an LCD panel to generate corrected pixel data, and driving the LCD panel using the corrected pixel data.Type: GrantFiled: March 13, 2008Date of Patent: October 25, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Jae-chul Lee, Jong-seon Kim
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Patent number: 8044908Abstract: A liquid crystal display device includes a timing controller generating a voltage compensation control pulse and a gate control signal, a voltage compensation signal generator generating a voltage compensation signal, the voltage level of which is gradually reduced during one frame period, in response to the voltage compensation control pulse, a power unit outputting a gate-on voltage to a plurality of gate lines by gradually increasing the level of the gate-on voltage in response to the voltage compensation signal, and a gate driver sequentially supplying the gate-on voltage to the plurality of gate lines in response to the gate control signal.Type: GrantFiled: January 11, 2008Date of Patent: October 25, 2011Assignee: Samsung Electronics Co., Ltd.Inventor: Se-Hoon Lee
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Patent number: 8044925Abstract: The present invention provides a method for driving a backlight module of a liquid crystal display. The backlight module includes three light sources, a first light source, a second light source, and a third light source, that illuminate different color light respectively. The method includes sequentially turning on the three light sources, wherein the first light source and the second light source are turned on twice and the third light source is turned on once.Type: GrantFiled: May 21, 2008Date of Patent: October 25, 2011Assignee: AU Optronics CorporationInventors: Chien-Hung Chen, Mei-Sheng Ma
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Patent number: 8040362Abstract: An output enable signal transformation device for a gate driver in an LCD device includes a reception terminal coupled to a timing generator of the LCD device for receiving an enable synchronization signal, an enable clock signal and a plurality of enable control signals generated by the timing generator, a shift register module coupled to the reception terminal for shifting the enable synchronization signal according to the enable clock signal, a multiplexer module coupled to the shift register module and the timing generator for generating a plurality of output enable signals according to the enable synchronization signal and the plurality of enable control signals, and an output terminal coupled to the multiplexer module and a logic circuit of the gate driver for outputting the plurality of output enable signals to the logic circuit.Type: GrantFiled: May 21, 2008Date of Patent: October 18, 2011Assignee: NOVATEK Microelectronics Corp.Inventors: Yu-Tsung Hu, Ching-Wen Kong
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Publication number: 20110248978Abstract: To increase the frequency of input of image signals in terms of design in a field-sequential liquid crystal display device. Image signals are concurrently supplied to pixels provided in a plurality of rows among pixels arranged in matrix in a pixel portion of the liquid crystal display device. Thus, the frequency of input of an image signal to each pixel can be increased without change in response speed of a transistor or the like included in the liquid crystal display device.Type: ApplicationFiled: April 1, 2011Publication date: October 13, 2011Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Jun KOYAMA, Hiroyuki MIYAKE, Shunpei YAMAZAKI
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Patent number: 8035598Abstract: Improving image sticking of a liquid crystal display (LCD) including a plurality of pixels, each of which includes a first subpixel and a second subpixel, includes driving the first subpixels of the pixels with a first optimized common voltage, driving the second subpixels of the pixels with a second optimized common voltage, and driving the LCD with a panel voltage. The panel voltage is between the first and the second optimized common voltages.Type: GrantFiled: June 30, 2008Date of Patent: October 11, 2011Assignee: AU Optronics Corp.Inventors: Pei-Chun Liao, Ting-Jui Chang, Pin-Miao Liu, Chien-Huang Liao, Yu-Chieh Chen
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Patent number: 8035696Abstract: A solid-state imaging apparatus includes comparing means for comparing a pixel signal obtained by a pixel section and a reference signal the value of which varies in a stepwise manner, analog-digital converting means for outputting, as a digital value, the amount of time when the pixel signal and the reference signal change levels by the comparing means, reset signal generating means for generating a reset signal that triggers a reset operation to be input to the comparing means in order to adjust the reference in the analog-digital converting means, and waveform processing means provided between the reset signal generating means and the comparing means for increasing the degree of dullness of a waveform of the reset signal.Type: GrantFiled: February 1, 2008Date of Patent: October 11, 2011Assignee: Sony CorporationInventors: Yuuki Yamagata, Ken Koseki, Masaru Kikuchi, Yoshiaki Inada, Junichi Inutsuka, Akari Tajima
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Patent number: 8035597Abstract: 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: GrantFiled: February 23, 2010Date of Patent: October 11, 2011Assignee: Sharp Kabushiki KaishaInventors: Toshihiro Yanagi, Hideki Morii, Hidekazu Miyata
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Publication number: 20110241979Abstract: A liquid crystal display having specific dispositions of pixels of a liquid crystal display so as to prevent the coupling defect and the stripe defect in high speed driving. The liquid crystal display includes a plurality of pixels arranged in a matrix shape, a switching element connected to each pixel, data lines and gate lines connected to the switching elements, and a data driver generating data voltages and applying the data voltages to the data lines. The data lines are disposed at both sides of the pixels in pairs, and data voltages of the same magnitude with different polarities are applied to the pairs of data lines. In this manner, preventing the coupling defect and the stripe defect, high speed driving can be performed.Type: ApplicationFiled: June 16, 2011Publication date: October 6, 2011Inventors: SEUNG-SOO BAEK, Dong-Gyu Kim, Back-Won Lee
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Patent number: 8031154Abstract: A display panel is scanned every two lines during a period of binary writing area in the first half of one frame period in partial display (or in small gradation display) and a steady-state current of an output amplifier for buffering gradation signals supplied to the display panel in a non-scanning period in the second half of one frame period is reduced.Type: GrantFiled: January 22, 2008Date of Patent: October 4, 2011Assignee: Hitachi Displays, Ltd.Inventors: Norio Mamba, Tsutomu Furuhashi
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Patent number: 8031153Abstract: A liquid crystal display for changing a supply sequence of a scanning pulse with which a plurality of gate lines are supplied to realize a one dot inversion, and a driving method thereof are disclosed. In the liquid crystal display, a liquid crystal display panel has a plurality of data lines and a plurality of gate lines, which are crossed each other, and pixels, which are defined by the lines. A gate driver supplies scanning pulses to the gate lines, and changes a supply sequence of the scanning pulses for each frame. A data driver converts digital video data into data voltages and periodically inverts a polarity of the data voltages to supply the data voltages in accordance with a supply sequence of the scanning pulses.Type: GrantFiled: August 27, 2007Date of Patent: October 4, 2011Assignee: LG Display Co., Ltd.Inventors: Sin Ho Kang, Jin Cheol Hong, Tae Hun Kim, Man Gyu Park, Seung Cheol O, Su Hyuk Jang
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Patent number: 8026888Abstract: A voltage supplying device (1) comprising a video line (LV1), a video line (LVn), a source line (LS1) of a source line group (GS1) supplied with a gray scale voltage through the video line (LV1), a source line (LSn) of a source line group (GS1) supplied with a gray scale voltage through the video line (LVn), a source line (LS1) of a source line group (GS2) supplied with a voltage through the video line (LV1), and a controlling means for continuing to supply the source line (LSn) of the source line group (GS1) during a transition from a state in which the source line (LS1) of a source line group (GS1) is supplied with a voltage to a state in which the source line (LSn) of a source line group (GS1) is supplied with a voltage.Type: GrantFiled: July 28, 2004Date of Patent: September 27, 2011Assignee: TPO Hong Kong Holding LimitedInventors: Hajime Nagai, Hirofumi Watsuda
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Patent number: 8022915Abstract: Disclosed is a liquid crystal driving device, which is without a gate PCB, having improved uniformity of screen, and a driving method thereof. The liquid crystal driving device comprises: a sequence recognition means for recognizing sequence of a pertinent gate driver IC by a pulse width of a vertical start signal inputted in synchronization with a vertical synchronous signal, and generating a Carry signal and location data of the pertinent gate driver IC; and a gate-off voltage generation means for receiving a first gate-off voltage and the location data of the pertinent gate driver IC, and outputting a second gate-off voltage which is generated by subtracting a voltage attenuation quantity corresponding to the location data of the gate driver IC from the first gate-off voltage.Type: GrantFiled: July 16, 2003Date of Patent: September 20, 2011Assignee: Hydis Technologies Co., Ltd.Inventors: Dong Hwan Lee, Tae Hyuk Kwon
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Patent number: 8022910Abstract: A liquid crystal display includes a signal control unit which supplies an image signal; a voltage supply unit which outputs a first reference voltage when the image signal is not at a highest grayscale level and outputs a second reference voltage having a voltage level higher than that of the first reference voltage when the image signal is at the highest grayscale voltage level; a grayscale voltage generating unit which receives the first reference voltage or the second reference voltage and generates a plurality of positive- and negative-polarity grayscale voltages whose voltage levels sequentially decrease; and a data driving unit which receives the image signal, the plurality of positive- and negative-polarity grayscale voltages and applies an image data voltage corresponding to the image signal to a pixel.Type: GrantFiled: December 19, 2007Date of Patent: September 20, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Eun-kyung Kim, Nam-suk Bang, Hyun-suck Jeong
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Patent number: 8022916Abstract: A liquid crystal display driving device that reduces horizontal crosstalk and a liquid crystal display employing the driving device are presented. The driving device includes a common voltage generator that generates first and second common voltages, and the common voltage generator includes a first capacitor provided between a first terminal for outputting the first common voltage and a second terminal for outputting the second common voltage. Since the capacitor is provided between two output terminals of the two common voltages, it reduces the distortion components of the common voltages, thereby reducing horizontal crosstalk. The invention reduces the number of parts in the driving device conferring the added benefit of reduced manufacturing cost.Type: GrantFiled: October 11, 2006Date of Patent: September 20, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Sung-Hee Lee, Seoung-Bum Pyoun
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Patent number: 8022914Abstract: The invention concern a display device comprising a liquid crystal material between a first substrate provided with row electrodes (7) and a second substrate provided with column electrodes (6), in which overlapping parts of the row and column electrodes define pixels (8), driving means (5) for driving the column electrodes (6) in conformity with an image to be displayed, and driving means (4) for driving the row electrodes (7), wherein the row electrodes (7) select at least one row during a row selection time and column voltages (Gj(t)) are supplied to the column electrodes (6), wherein the column voltage waveform depends on the grey scale to be displayed by the driven pixel in a certain column and depends on a used selection signal (Fi) for the selected row, wherein a column voltage (Gj(t)) is switchable between at least two different column voltage levels during a row selection time.Type: GrantFiled: June 2, 2004Date of Patent: September 20, 2011Assignee: NXP B.V.Inventor: Martin Lienhard
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Patent number: 8018422Abstract: A source driver supplies a grayscale voltage to a liquid crystal capacitor and a storage capacitor provided in parallel with the liquid crystal capacitor, a voltage that changes in synchronization with a polarity inversion timing being applied to one end of the storage capacitor. The source driver includes an offset value calculation section that calculates an offset value based on grayscale data corresponding to respective color components of one pixel, a grayscale data correction section that corrects the grayscale data using the offset value corresponding to the respective color components, and a source line driver section that drives a source line corresponding to the respective color components based on the grayscale data that has been corrected by the grayscale data correction section.Type: GrantFiled: January 22, 2008Date of Patent: September 13, 2011Assignee: Seiko Epson CorporationInventor: Akira Morita
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Patent number: 8013820Abstract: A method, device and computer program are detailed for modulating write light. For a plurality of pixel locations of an electro-optic layer of an optical write valve and across each of a plurality of consecutive frames, a set of pixel data bits is modulated across a first and a second pulse width period of the frame. The first and second pulse width periods, and adjacent pulse periods of sequential frames, are separated from one another by a pulse-off period that is at least equal to a response time of the electro-optic layer during which no bits are modulated. Separately in each frame, write light is output from each of the plurality of pixel locations according to the modulated pixel data bits in the frame. In an embodiment, the set of pixel data bits are modulated by applying a voltage at a pixel location of the electro-optic layer in synchronism with illuminating a light source that illuminates that pixel location.Type: GrantFiled: June 1, 2007Date of Patent: September 6, 2011Assignee: Compound Photonics LimitedInventors: Howard V. Goetz, James L. Sanford, Jonathan A. Sachs
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Publication number: 20110210953Abstract: A liquid crystal display device includes a segment driver, a common driver, and a voltage setting unit. The voltage setting unit derives a voltage at which a previous drive line becomes a focal conic state regardless of image data by applying a synthesized voltage of a voltage that is applied from the segment driver and a voltage that is applied from the common driver to the previous drive line. Then, the voltage setting unit sets the voltages that are applied from the segment driver and the common driver on the basis of the derived result.Type: ApplicationFiled: February 3, 2011Publication date: September 1, 2011Applicant: FUJITSU LIMITEDInventors: Masaki NOSE, Hirokata Uehara
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Publication number: 20110205203Abstract: In order to carry out a display reset operation, a segment driver and a common driver are driven to operate as below during a display data reading period in which voltages to be applied to a liquid crystal display panel are nonuniform between lines. First, a shift register and a level shifter which are provided in the segment driver and a shift register and a level shifter which are provided in the common driver are driven to operate as usual, whereas a display control signal supplied from a controller causes output circuits to stop carrying out their respective output operations. In at least one embodiment, during a period in which a writing operation is carried out with respect to the liquid crystal display panel so as to carry out the display reset operation, the display control signal supplied from the controller allows the output circuits to carry out the respective output operations. This allows a memory (e.g.Type: ApplicationFiled: October 28, 2009Publication date: August 25, 2011Applicant: Sharp Kabushiki KaishaInventors: Toru Kuriyama, Hisashi Yamaguchi, Hiromasa Asada
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Patent number: 8004485Abstract: A gate modulation circuit is provided. A comparator compares a triangular wave voltage of a capacitor with a second reference voltage. If the triangular wave voltage of the capacitor exceeds the second reference voltage, a conduction path is turned off. A comparator controls desired discharge to a capacitor through a discharge resistor. Based on the discharge, power voltage (high level power voltage of the scanning driver) provided to the scanning driver is modulated, and outputted from the gate modulation circuit to the scanning driver as high level power voltage of the scanning driver.Type: GrantFiled: November 14, 2007Date of Patent: August 23, 2011Assignee: Au Optronics Corp.Inventor: Hitoshi Nakatsuka
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Patent number: 8004482Abstract: 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: GrantFiled: May 15, 2006Date of Patent: August 23, 2011Assignee: LG Display Co., Ltd.Inventors: Seok Woo Lee, Nam Hee Kim
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Publication number: 20110187690Abstract: A gate modulation circuit is provided. A comparator compares a triangular wave voltage of a capacitor with a second reference voltage. If the triangular wave voltage of the capacitor exceeds the second reference voltage, a conduction path is turned off. A comparator controls desired discharge to a capacitor through a discharge resistor. Based on the discharge, power voltage (high level power voltage of the scanning driver) provided to the scanning driver is modulated, and outputted from the gate modulation circuit to the scanning driver as high level power voltage of the scanning driver.Type: ApplicationFiled: April 12, 2011Publication date: August 4, 2011Applicant: AU OPTRONICS CORP.Inventor: Hitoshi Nakatsuka
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Publication number: 20110187633Abstract: A display including a display panel and a compensation circuit is provided. The display panel includes a plurality of common lines for transmitting a common voltage; a plurality of scan lines; a plurality of data lines disposed substantially perpendicular to the scan lines; a plurality of pixels arranged in an array and each electrically connected to the corresponding data line, scan line, and common line; and a sensing line crossing over at least one first data line among the data lines. A parasitic capacitor is formed between the first data line and the sensing line. The compensation circuit is electrically connected to the sensing line and the common lines. The compensation circuit generates a compensation signal for the common lines according to a coupling signal induced by the parasitic capacitor between the first data line and the sensing line so as to restrain ripple of the common voltage.Type: ApplicationFiled: May 5, 2010Publication date: August 4, 2011Applicant: AU OPTRONICS CORPORATIONInventors: Yu-Ting Huang, Yi-Suei Liao, Pei-Chen Chan
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Patent number: 7990361Abstract: A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of transparent substrates, at least one of which has patterned electrodes on an inner surface thereof, and a backlight disposed behind the liquid crystal display panel. The backlight has at least one discharge tube including a sealed-off transparent tube, a phosphor film formed on an inner surface of the sealed-off transparent tube, and a discharge gas within the sealed-off transparent tube and plural electrodes spaced in a direction of an axis of the sealed-off transparent tube and positioned at least partially around a circumference of the sealed-off transparent tube. At least two adjacent ones of the plural electrodes is supplied with alternating voltages different in frequency from each other, respectively.Type: GrantFiled: March 6, 2009Date of Patent: August 2, 2011Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Publication number: 20110169796Abstract: A liquid crystal display includes a liquid crystal panel, a drive circuit, and a power circuit. The drive circuit includes a gate driver, a timing control circuit, and a wave signal generation circuit. The timing control circuit sends a timing control signal to the gate driver and the wave signal generation circuit. The wave signal generation circuit generates a control signal according to the timing control signal, and generates a wave signal according to the control signal. The gate driver generates scan signals according to the timing control signal and the wave signal. Before the voltage of the scan signal changes from a maximum voltage to a minimum voltage, the voltage of the scan signal decreases to an invariable middle voltage that is between the minimum voltage and the maximum voltage during a fall time of the scan signal.Type: ApplicationFiled: December 12, 2010Publication date: July 14, 2011Applicants: INNOCOM TECHNOLOGY (SHENZHEN) CO., LTD., CHIMEI INNOLUX CORPORATIONInventors: WEI GUO, SHA FENG
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Publication number: 20110169803Abstract: A liquid crystal display device includes: a light source section; a liquid crystal display panel including pixels and performing video display; and a drive section. The drive section performs the driving on the light source section for turning ON and OFF in synchronization with the driving of the pixels for the light-sequential writing such that, the liquid crystal display panel is selectively illuminated with the light from a lower emission region in the light source section when the pixels in an upper display region are under the driving for line-sequential writing, and such that, the liquid crystal display panel is selectively illuminated with the light from an upper emission region when the pixels in a lower display region are under the driving for line-sequential writing. A phase difference between emission periods in the upper and lower emission regions falls within a range from 90° to 150° both inclusive.Type: ApplicationFiled: December 17, 2010Publication date: July 14, 2011Applicant: Sony CorporationInventors: Norifumi Kikuchi, Shinji Ogawa, Yoriaki Yoshizawa
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Patent number: 7978162Abstract: In a liquid crystal display device which inputs analogue video signals after phase development, the deterioration of display quality due to the irregularities of circuit can be reduced. To correct the irregularities due to a plurality of analogue circuits, the liquid crystal display device includes look up tables for a plurality of analogue circuits in the inside of a digital signal processing circuit. The liquid crystal display device performs the correction of irregularities of the analogue circuits based on data set in the look up tables.Type: GrantFiled: November 1, 2005Date of Patent: July 12, 2011Assignees: Hitachi, Ltd., Hitachi Displays, Ltd.Inventors: Yoshio Maruoka, Toshiki Misonou, Toshio Maeda, Akihiro Watanabe, Hideki Nakagawa
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Patent number: 7978168Abstract: A D/A converter for receiving a plurality of divisional voltages and converting a digital signal to an analog voltage with the divisional voltages, the D/A converter includes a selection circuit for receiving the divisional voltages and the digital signal to select one of the divisional voltages. The selection circuit includes a plurality of first switch circuits that are selectively activated in response to the digital signal to select one of the divisional voltages, with each of the first switch circuits being provided with a logic switch function and having an ON resistance when activated, and at least an activated one of the first switch circuits further dividing the selected one of the divisional voltages with the ON resistance. The plurality of switch circuits includes at least one voltage dividing switch circuit used to further divide the selected one of the divisional voltages.Type: GrantFiled: August 6, 2007Date of Patent: July 12, 2011Assignee: Fujitsu Semiconductor LimitedInventors: Hideto Fukuda, Shinya Udo, Masao Kumagai, Osamu Kudo
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Patent number: 7978167Abstract: A display section of a portable phone includes a first polarizer, a switching panel section, a reflective polarizer, and a main panel section. The switching panel section has a liquid crystal layer including a plurality of regions having at least two different alignment directions. This makes it possible, by utilizing the difference in the alignment direction of the liquid crystal layer, to make the image difficult to observe by a sight-line from an oblique direction. Furthermore, it is also possible, by utilizing the mirror-surface displaying caused by the reflective polarizer, to make the image significantly difficult to observe.Type: GrantFiled: September 22, 2006Date of Patent: July 12, 2011Assignee: Sharp Kabushiki KaishaInventors: Koji Yabuta, Hiroshi Fukushima, Akira Imai, Tomoo Takatani
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Patent number: 7973754Abstract: A display substrate includes a base substrate, a gate line, a data line, a pixel electrode and a shielding electrode. The base substrate includes a plurality of unit pixel areas arranged in a matrix shape. The gate line extends between the unit pixel areas. The data line crosses the gate line. The data line extends between the unit pixel areas. The pixel electrode is disposed in the unit pixel area. The pixel electrode is electrically connected to an output electrode of a switching element electrically connected to the gate and data lines. The shielding electrode is disposed the gate and data lines. The shielding electrode has an opening an opening formed therein, the opening disposed above and extending along a direction of the gate line.Type: GrantFiled: April 17, 2007Date of Patent: July 5, 2011Assignee: Samsung Electronics Co., Ltd.Inventor: Dong-Gyu Kim
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Patent number: 7961165Abstract: A liquid crystal display device includes a plurality of pixels, each of which includes a liquid crystal capacitor made up of a liquid crystal layer and two electrodes to apply a voltage to the liquid crystal layer. While the device is conducting a display operation, an oscillation voltage, which oscillates a number of times within a single vertical scanning period, and a predetermined gray-scale voltage are applied to the liquid crystal capacitor of an arbitrary one of the pixels.Type: GrantFiled: August 25, 2004Date of Patent: June 14, 2011Assignee: Sharp Kabushiki KaishaInventor: Fumikazu Shimoshikiryoh
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Patent number: 7956941Abstract: According to one embodiment, a method for reducing speckle in an image produced from a coherent light source includes directing a beam of coherent light at an electrically controlled diffuser. An electrical signal is applied to the electrically controlled diffuser to produce an electrical field across the electrically controlled diffuser layer. At least one of an amplitude and a frequency of the electrical signal are varied to transition the controlled diffuser between a first state and a second state. The varied application of the electrical signal operates to reduce spatial coherence in an image projected through the electrically controlled diffuser.Type: GrantFiled: August 1, 2007Date of Patent: June 7, 2011Assignee: Texas Instruments IncorporatedInventor: Sajjad Ali Khan
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Patent number: 7952552Abstract: 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: GrantFiled: June 15, 2010Date of Patent: May 31, 2011Assignee: LG Display Co., Ltd.Inventors: Nam Yong Kong, Tae Ho You
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Publication number: 20110122113Abstract: A gate driving method for a liquid crystal display (LCD) and a gate driver thereof are provided. The LCD has a plurality of scan lines. The method starts by generating a gate driving signal. A correction signal is superposed to the gate driving signal to generate a corrected gate driving signal and to reduce a high voltage level of the gate driving signal, wherein a polarity of the correction signal is opposite to a polarity of the gate driving signal. The corrected gate driving signal is then outputted to drive one of the corresponding scan lines.Type: ApplicationFiled: January 31, 2011Publication date: May 26, 2011Applicant: AU OPTRONICS CORPORATIONInventors: Wen-Fa Hsu, Chien-Yu Yi
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Patent number: 7948458Abstract: An amplifier circuit and display device utilizing the amplifier circuit are provided. The amplifier circuit comprises a buffer amplifier which stabilizes an input signal and outputs a stabilized output signal. By supplying to the input terminal of the buffer amplifier, a voltage derived by adding a difference between the input signal and the output signal to the input signal, it is possible to change the input signal level in accordance with the deviation of the buffer amplifier, which allows correction of the output level to a suitable level.Type: GrantFiled: August 15, 2006Date of Patent: May 24, 2011Assignee: Sony CorporationInventors: Michiru Senda, Hiroyuki Horibata
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Patent number: 7944425Abstract: The invention relates to a liquid crystal display element displaying an image using a liquid crystal layer having memory characteristics and a method of driving the element. A liquid crystal display element capable of suppressing the generation of an afterimage attributable to image sticking is provided along with a method of driving the same.Type: GrantFiled: May 20, 2010Date of Patent: May 17, 2011Assignee: Fujitsu LimitedInventors: Tsuneo Watanuki, Makoto Fukuda, Fumio Yamagishi
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Patent number: 7944411Abstract: To equalize the intensity of light emitted by display elements on a display device, a plurality of current-drive circuits are connected in cascade through two terminals of each of the current-drive circuits, each comprising a reference current generation section including a reference resistor and a plurality of current drive sections. Reference current sunk by an external reference current source causes a voltage drop across the reference resistor, and the voltage drop is applied across a current adjustment resistor In response to an image signal, the current-drive circuit outputs current, determined by multiplying each of a plurality of internal reference currents by an optional factor and summing the resulting currents to the display elements. Since the magnitude of the internal reference current flowing inside the current-drive circuit can be varied by varying the value of the current adjustment resistor, gamma correction can be applied to drive current with high accuracy.Type: GrantFiled: January 30, 2004Date of Patent: May 17, 2011Assignee: NEC ElectronicsInventor: Yutaka Saeki
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Patent number: 7940240Abstract: In an image data processing device of the invention, an image memory sequentially stores input image data of multiple frames. A write control module controls a writing operation into the image memory, and a read control module controls a reading operation from the image memory. A driving image data generation module generates the driving image data from read image data sequentially read from the image memory. The driving image data generation module generates the driving image data by replacing at least part of the read image data with regard to selected pixels with mask data. The mask data is set corresponding to a pixel value of the read image data in each of the selected pixels to be replaced with the mask data. This arrangement of the invention effectively reduces blur of a moving image displayed by the image display device, while preventing a significant decrease in luminance level of the displayed image.Type: GrantFiled: October 31, 2005Date of Patent: May 10, 2011Assignee: Seiko Epson CorporationInventors: Kesatoshi Takeuchi, Takahiro Sagawa
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Publication number: 20110102395Abstract: A system and method of controlling scanning actions of an LCD is disclosed. A timing controller (Tcon) output enable (OE) generator generates an original OE signal, and a noise detection unit generates a noise-detected signal upon detecting noise. An OE mask generator generates a mask signal according to the noise-detected signal and the original OE signal. A masking unit generates a resultant OE signal according to the mask signal and the original OE signal.Type: ApplicationFiled: April 29, 2010Publication date: May 5, 2011Applicant: HIMAX TECHNOLOGIES LIMITEDInventors: PU-JEN CHENG, PEN-HSIN CHEN
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Publication number: 20110102394Abstract: A method and system of controlling halt and resumption of scanning actions of an LCD is disclosed. An incoming video source is monitored, and current scan line position and corresponding polarity are recorded. When an abnormal video source is detected, the LCD scanning is stopped at a halt scan line of a halt frame with a halt polarity. After a normal video source has been detected again, determination is made of a proper resumptive scan line and/or a resumptive polarity. The panel scanning is resumed at the resumptive scan line equal to the halt scan line and/or with the resumptive polarity matching the halt polarity.Type: ApplicationFiled: November 4, 2009Publication date: May 5, 2011Applicant: HIMAX TECHNOLOGIES LIMITEDInventors: PU-JEN CHENG, CHIH-CHENG CHEN
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Patent number: 7936327Abstract: An exemplary driving circuit (20) includes: gate lines (201); data lines orthogonal to the gate lines (202); thin film transistors (203); gate driving circuits (210) for driving the gate lines; data driving circuits (220) for driving the data lines; and a compensative unit (230) having a first input terminal (235), a second input terminal (236), and output terminals (238) coupled to the data driving circuits. The first and second input terminals are coupled to two nodes (a, b) of one of the gate line, and the two nodes are coupled to two gate electrodes of two thin film transistors respectively connected to two data driving circuits. The compensative unit outputs compensative voltages for compensating data voltage signals outputted by the data driving circuits.Type: GrantFiled: October 1, 2007Date of Patent: May 3, 2011Assignees: Innocom Technology (Shenzhen) Co., Ltd., Chimei Innolux CorporationInventors: Guo-Hua Yu, Yu-Hsun Jen
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Publication number: 20110090212Abstract: A voltage stabilizer circuit for alternately or simultaneously stabilizing first and second generated voltages includes shared capacitor connected between the first and second generated voltages. The voltage stabilizer circuit may further include first and second switches for alternately connecting the first and second electrode of the shared capacitor to a ground. The alternation of the stabilized first and second voltages output by the voltage stabilizer circuit can be synchronized with a pixel polarity inversion mode signal output by the internal driver circuit of an LCD display.Type: ApplicationFiled: May 20, 2010Publication date: April 21, 2011Inventors: Byung-hun Han, Jae-goo Lee
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Patent number: 7929072Abstract: 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: GrantFiled: December 6, 2007Date of Patent: April 19, 2011Assignee: Hitachi Displays. Ltd.Inventor: Eiji Oohira
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Patent number: 7924255Abstract: A gate driving method for a liquid crystal display (LCD) and a gate driver thereof are provided. The LCD has a plurality of scan lines. The method starts by generating a gate driving signal. A correction signal is superposed to the gate driving signal to generate a corrected gate driving signal and to reduce a high voltage level of the gate driving signal, wherein a polarity of the correction signal is opposite to a polarity of the gate driving signal. The corrected gate driving signal is then outputted to drive one of the corresponding scan lines.Type: GrantFiled: April 19, 2005Date of Patent: April 12, 2011Assignee: AU Optronics Corp.Inventors: Wen-Fa Hsu, Chien-Yu Yi
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Patent number: 7907111Abstract: A driving circuit for driving a liquid crystal device that has, a first substrate including a plurality of scanning lines, a plurality of data lines, and a plurality of pixel electrodes and a plurality of common electrodes, a second substrate disposed opposite the first substrate, and liquid crystal, the common electrodes being partitioned every horizontal line, the driving circuit includes: a control circuit that alternately supplies a first voltage and a second voltage being higher than the first voltage to the common electrodes and that sets the common electrodes to a floating state; a scanning line driving circuit that sequentially supplies a selection voltage to the plurality of scanning lines; and a data line driving circuit that alternately supplies a positive image signal having a potential higher than the first voltage and a negative image signal having a potential lower than the second voltage to the plurality of data lines.Type: GrantFiled: August 24, 2007Date of Patent: March 15, 2011Assignee: Epson Imaging Devices CorporationInventor: Shin Fujita