Field Period Polarity Reversal Patents (Class 345/96)
  • Patent number: 8217929
    Abstract: A method of driving the electro-optical device includes selecting a plurality of scanning lines in a predetermined order in each of first and second fields of one frame; when one of the plurality of scanning lines is selected in the first field, for each pixel located on the selected scanning line, supplying one of a positive voltage and a negative voltage as the data signal to one of the plurality of data lines associated with the pixel, the positive voltage having a positive polarity corresponding to a voltage higher than a predetermined reference potential and the negative polarity corresponding to a voltage lower than the predetermined reference potential; and when the one of the plurality of scanning lines is selected in the second field, for each pixel located on the selected scanning line, supplying the other one of the positive voltage and the negative voltage as the data signal to one of the plurality of data lines associated with the pixel.
    Type: Grant
    Filed: December 10, 2007
    Date of Patent: July 10, 2012
    Assignee: Seiko Epson Corporation
    Inventor: Toshiaki Tokumura
  • Patent number: 8217882
    Abstract: An liquid crystal display with data compensating function includes a plurality of gate lines, a plurality of first data lines, a plurality of second data lines, a pixel array, a first common end, a second common end, a plurality of first coupling lines, and a plurality of second coupling lines. The first coupling lines are disposed correspondingly near the first data lines, and are coupled to the first common end. The second coupling lines are disposed correspondingly near the second data lines, and are coupled to the second common end. The first common end carries voltages having same polarity as those of the first data lines for driving the first coupling lines. The second common end carries voltages having same polarity as those of the second data lines for driving the second coupling lines. The first common end is isolated from the second common end.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: July 10, 2012
    Assignee: AU Optronics Corp.
    Inventors: Yi-Chien Wen, Chi-Mao Hung
  • Patent number: 8217871
    Abstract: A touch-controlled LCD includes a liquid crystal display panel and a touch panel. The liquid crystal display panel includes a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate. The touch panel is disposed on a side of the second substrate facing away from the liquid crystal layer. The touch panel includes a plurality of first electrodes being parallel to each other, a plate shaped second electrodes facing the first electrodes, and a plurality of spacers disposed between the first electrodes and the second electrode.
    Type: Grant
    Filed: January 15, 2009
    Date of Patent: July 10, 2012
    Assignee: Chi Hsin Electronics Corp.
    Inventors: Hui-Lung Lai, Chun-Jung Chen, Jung-Hsin Huang
  • Patent number: 8212752
    Abstract: A method of economically manufacturing display devices having a matrix of drivable pixels arranged in rows and columns arranged to be driven by IC drivers, including the steps of including a plurality of sensor signal lines in the display device that are selectively connectable to certain of the pixel rows, a plurality of sensor signal lines selectively connectable to certain of the pixel columns, transmitting test signals to test predetermined ones of the rows and columns of pixels, and connecting pixel driving circuits to those display devices exhibiting uniform pixel brightness in response to the test signals.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: July 3, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Myung-Woo Lee, Joo-Hyung Lee, Sang-Jin Pak, Kee-Han Uh
  • Patent number: 8207923
    Abstract: The disclosure describes a liquid crystal display panel including 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 has first and second gray scale regions which are split up and down and have different areas, 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 first and second gray scale regions so that 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 28, 2010
    Date of Patent: June 26, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyoung Ju Shin, Hak Sun Chang, Yeon Ju Kim, Seung Hoo Yoo, Hyun Wuk Kim, Hee Wook Do
  • Publication number: 20120154359
    Abstract: The stereoscopic display device has a display panel, a barrier liquid crystal panel disposed on the display panel, and a driving circuit for driving the display panel and the barrier liquid crystal panel, in which the frame frequency of the display panel and the alternating frequency of the barrier liquid crystal panel are different, the barrier liquid crystal panel is driven by a driving voltage input from the driving circuit, the driving circuit has an inverter circuit for outputting the driving voltage, independently controls a p-type transistor and an n-type transistor in the inverter circuit, and has time periods in which both the p-type transistor and the n-type transistor are turned off when the driving voltage is switched from a high level to a low level or a low level to a high level.
    Type: Application
    Filed: December 12, 2011
    Publication date: June 21, 2012
    Inventors: Takeshi SHIBATA, Yoshihiro Kotani, Shouji Nagao
  • Patent number: 8199093
    Abstract: A liquid crystal display and a method of driving the same are disclosed. The liquid crystal display includes a timing signal multiplying circuit multiplying a frequency of a timing signal, a timing control signal generating circuit generating a polarity control signal based on the multiplied timing signal, a polarity control signal inverting circuit that inverts the polarity control signal in response to an inverse periodic signal, that is inverted every constant time interval, to generate an inverse polarity control signal, and a data drive circuit that respectively converts digital video data and digital black data into a video data voltage and a black gray level voltage, inverts polarities of the video data voltage and the black gray level voltage in response to the inverse polarity control signal, and supplies the video data voltage and the black gray level voltage to data lines.
    Type: Grant
    Filed: December 24, 2008
    Date of Patent: June 12, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Hongsung Song, Woongki Min, Yonggi Son, Suhyuk Jang
  • Patent number: 8199141
    Abstract: It is an object to provide a high reliable display device which can suppress the generation of high electric field near the drain of the transistor used as a switching element and a driving method thereof. A relaxation time when charge is stored in the display element of the pixel and other capacitors connected to the display element in parallel is focused on, and the voltage applied between the source and the drain of the transistor in the writing period is suppressed by changing the video signal applied to the signal line step by step and finally setting it at the desired level.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: June 12, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Tatsuya Honda
  • Patent number: 8199173
    Abstract: In a liquid crystal display apparatus, one display pixel has a total of six sub pixels, namely, a red sub pixel for a left eye, a green sub pixel for the left eye, a blue sub pixel for the left eye, a red sub pixel for a right eye, a green sub pixel for the right eye, and a blue sub pixel for the right eye. Those sub pixels are arranged in a square area, two in a horizontal direction along which gate lines extend, three in a vertical direction along which data lines extend. The polarity of the data lines with respect to a potential of a common electrode is inverted every time three gate lines are scanned and every frame.
    Type: Grant
    Filed: September 28, 2010
    Date of Patent: June 12, 2012
    Assignee: NLT Technologies, Ltd.
    Inventors: Masao Iriguchi, Naoyasu Ikeda, Shin-ichi Uehara
  • Patent number: 8199094
    Abstract: A display device includes a liquid crystal display panel having a first and second substrates with scanning electrodes and data electrodes and a liquid crystal layer; a scanning electrode driving circuit applying to the scanning electrodes scan pulse; a data electrode driving circuit applying to the data electrodes data pulses having combinations of different voltage levels according to write data; and a driving control circuit supplying to the scanning and data electrode driving circuits a pulse control signal controlling the phase of the scan pulses and data pulses. The scanning and data electrode driving circuits control the scan pulses and data pulses at voltage levels according to the pulse control signal, and the driving control circuit inverts or does not invert the phase of the pulse control signal, at each application interval of the scan pulses, according to the number of changed values and unchanged values of the write data.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: June 12, 2012
    Assignee: Fujitsu Limited
    Inventors: Masaki Nose, Hisashi Yamaguchi
  • Patent number: 8199099
    Abstract: An apparatus and method for driving a liquid crystal display device are disclosed. The apparatus includes a liquid crystal panel with pixels defined by data and gate lines. A gate driver provides different gate pulses to the odd-column pixels than to the even-column pixels. The gate pulses have different voltages and/or widths. Data drivers provide data voltages having a positive or negative polarity to the data lines. A timing controller controls the gate and data drivers and supplies gate clock pulses that have different voltages and/or widths to the gate driver.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: June 12, 2012
    Assignee: LG Display Co., Ltd
    Inventors: Sun Young Kwon, Do Heon Kim, Su Hwan Moon, Ji Eun Chae
  • Patent number: 8194196
    Abstract: A liquid crystal display device and a fabricating method thereof for driving the liquid crystal display device using a magnetic field are disclosed. In the device and method, a current is applied to a first electrode in a first direction, and a current is applied to a second electrode in a second direction. A liquid crystal layer is driven with a magnetic field induced by the currents from the first and second electrodes modulating a light.
    Type: Grant
    Filed: December 23, 2004
    Date of Patent: June 5, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Don Gyou Lee, Jung Ho Kil, Do Yeon Kim
  • Patent number: 8194023
    Abstract: A driving circuit of a flat panel display can transfer a signal input from a decoder to a corresponding channel while minimizing a size of a MOS transistor for a switch or an amplification driver. The driving circuit of the flat panel display includes a first data signal processing unit for converting a first display information that will be displayed on the flat panel display into a positive gamma value, a second data signal processing unit for converting a second display information that will be displayed on the flat panel display into a negative gamma value, an output driving unit for outputting the negative and positive gamma values to the flat panel display, and a switch unit for selectively transferring the positive and negative gamma values to the output driving unit.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: June 5, 2012
    Assignee: MagnaChip Semiconductor Ltd.
    Inventor: Soo-Yang Park
  • Publication number: 20120133577
    Abstract: A drive device for driving a liquid crystal display panel by column inversion driving, whereby power consumption is further reduced. In an output buffer 251 to apply a voltage to source wirings, in a prescribed period after initiation of driving at one frame, a bias circuit 262 gives a bias voltage to lower the driving ability of an amplifier 261, whereby a first switch 263 becomes an open state and a second switch 264 becomes a closed state. Upon termination of the prescribed period, the first switch 263 becomes a closed state and the second switch 264 becomes an open state, whereby a source wiring is driven by a voltage signal from a D-A converter.
    Type: Application
    Filed: November 21, 2011
    Publication date: May 31, 2012
    Applicant: OPTREX Corporation
    Inventor: Kenji GONDO
  • Publication number: 20120127144
    Abstract: A liquid crystal display (LCD) and a source driving apparatus and a driving method of a panel thereof are provided. In the present invention, two data strings with matched driving polarities are selected to perform charge-sharing, before pixels are driven by output buffers of the source driving apparatus. Accordingly, the power consumed by the output buffers of the source driving apparatus would be lower during the process of driving pixels, and thus achieving the purpose of power saving.
    Type: Application
    Filed: April 28, 2011
    Publication date: May 24, 2012
    Applicant: AU OPTRONICS CORPORATION
    Inventor: Zhi-Hao Sun
  • Patent number: 8184082
    Abstract: A liquid crystal display selectively operates in one of a full screen display mode, in which the full screen of the display panel is set as a display area, and a partial display mode, in which a partial area in the full screen is set as a display area and a remaining area is set as a non-display area.
    Type: Grant
    Filed: January 9, 2009
    Date of Patent: May 22, 2012
    Assignee: Epson Imaging Devices Corporation
    Inventor: Kenichi Tajiri
  • Patent number: 8184030
    Abstract: A source driver includes at least a channel, and the channel includes an N-type digital-to-analog converter (NDAC) and an operational amplifier. The NDAC is utilized for receiving input data and selecting one of a plurality of gamma voltages to generate output data according to the input data. The operational amplifier is coupled to the NDAC, and is utilized for amplifying at least the output data to generate an amplified output data. In addition, the channel does not include any P-type digital-to-analog converter.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: May 22, 2012
    Assignee: Himax Technologies Limited
    Inventors: Wei-Kai Tseng, Chin-Tien Chang
  • Patent number: 8179346
    Abstract: A driving circuit for driving a display panel comprising: (i) a printed circuit board, (ii) an input interface to receive input video signal, (iii) a timing controller to control timing signal for the display panel, (iv) a plurality of first source drivers, and (v) at least one second source driver, and wherein the display cells connected to the i-th data line and the (2j+1)-th or (2j+2)-th gate line, where j=0, 2, 4, . . . , <[Y/2], and i=1, 2, . . . , M, where Y and M are positive integers, receive data signals from corresponding data lines 1 through M, respectively, and the display cells connected to the (i+1)-th data line and the (2j+1)-th or (2j+2)-th gate line, where j=1, 3, . . . , <[Y/2]+1, and i=1, 2, . . . , M, receive shifted data signals from the data lines 2 through M+1, respectively.
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: May 15, 2012
    Assignee: AU Optronics Corporation
    Inventors: Chun-Fan Chung, Sheng-Kai Hsu, Chih-Hsiang Yang
  • Patent number: 8179351
    Abstract: A liquid crystal display and a method of driving the same are disclosed. A timing controller of the liquid crystal display controls a polarity control signal to have a different phase in each frame and allows liquid crystal cells to be divided into a first liquid crystal cell group charged to a data voltage of a same polarity during two frame periods and a second liquid crystal cell group charged during a current frame period to the data voltage with a polarity opposite a polarity of the data voltage charged during a previous frame period. The liquid crystal cells belonging to the first liquid crystal cell group are successively charged to the data voltage of the same polarity during three or more frame periods at intervals of a predetermined time equal to or longer than two frame periods.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: May 15, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Hongsung Song, Woongki Min, Yonggi Son, Suhyuk Jang
  • Publication number: 20120105514
    Abstract: A liquid crystal driving circuit is disclosed which carries out time-division driving with respect to each pixel constituting a liquid crystal display panel by causing a bright and dark frame period and a positive and negative frame period to be different from each other, the bright and dark frame period being a period of brightness and darkness of luminance at which to drive the each pixel, the positive and negative frame period being a period of polarities of a voltage to be applied to liquid crystal of the each pixel.
    Type: Application
    Filed: May 21, 2010
    Publication date: May 3, 2012
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Asahi Yamato, Masaki Uehata
  • Publication number: 20120105735
    Abstract: Each pixel includes two pixel electrodes connected to each other via a capacitor, and in respect to a pixel (101) that belongs to the column of pixels and to the row of pixels, a transistor (12a) connected to one of the two scanning signal lines (16a, 16b) is electrically connected to one of two pixel electrodes (17a, 17b) included in the pixel (101), a transistor (12b) connected to the other one of the two scanning signal lines is electrically connected to the other one of the two pixel electrodes, and each of these transistors (12a, 12b) is electrically connected to an identical data signal line (15x) that is one of the two data signal lines (15x, 15y).
    Type: Application
    Filed: April 15, 2010
    Publication date: May 3, 2012
    Applicant: SHARP KABUSHIKI KAISHA
    Inventor: Toshihide Tsubata
  • Publication number: 20120105406
    Abstract: A driving circuit and a liquid crystal display using the same. In the driving circuit, a first switch and a second switch are provided in a VCOM driver thereof. The first switch is designed to be turned on to a ground a VCOM terminal of a display capacitor, and the second switch is designed to be turned on to couple a constant voltage level DC VCOM to the VCOM terminal of the display capacitor. In addition, a timing controller of the driving circuit is designed for reducing power consumption, which controls the statuses of the first and second switches and determines when to allow a positive polarity voltage to be coupled to the display capacitor to charge the display capacitor for positive polarity display.
    Type: Application
    Filed: October 27, 2010
    Publication date: May 3, 2012
    Applicant: Himax Technologies Limited
    Inventors: Wen-Lin Yang, Chih-Lung Kuo
  • Publication number: 20120105419
    Abstract: A driving circuit with reduced power consumption and a liquid crystal display using the same. The driving circuit includes at least a power circuit, a source driver and a VCOM driver. The power circuit is coupled to a power supply to receive a power signal to generate a positive supply voltage and an inverted power signal. The source driver includes a first source operational amplifier. The first source operational amplifier is powered by the positive supply voltage and a power ground, to couple a positive polarity display voltage to a first terminal of a first display capacitor of a pixel array. The VCOM driver includes a VCOM operational amplifier. The VCOM operational amplifier provides a second terminal of the first display capacitor with a VCOM voltage, and a negative power terminal of the VCOM operational amplifier is coupled to the inverted power signal.
    Type: Application
    Filed: October 28, 2010
    Publication date: May 3, 2012
    Applicant: HIMAX TECHNOLOGIES LIMITED
    Inventors: Wen-Lin Yang, Shih-Yu Wen
  • Patent number: 8169556
    Abstract: Disclosed is an LCD comprising a plurality of data lines extending in a first direction, a plurality of gate lines extending in a second direction defining with the plurality of data lines a plurality of pixel areas arranged in a matrix configuration and supplying a gate signal to at least two rows of the pixel areas simultaneously. Thin film transistors are connected to the plurality of gate lines and the plurality of data lines. Also disclosed is a driving method for an LCD including a thin film transistor substrate including pixel areas arranged in a matrix form with a gate line extending in a first direction and a data line extending in a second direction, along with a backlight providing the TFT substrate with light of three primary colors. In the method, the three primary colors are sequentially provided in one frame period and at least two rows of pixel areas and simultaneously provided with a common gate signal.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: May 1, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Joon-hak Oh, Cheol-woo Park, Chong-chul Chai
  • Patent number: 8169559
    Abstract: In an array substrate and a method of manufacturing the array substrate, an array substrate includes a first switching element, a second switching element, a third switching element and a fourth switching element. The first switching element is electrically connected to a first data line. The second switching element is electrically connected to a second data line adjacent to the first data line. The third switching element is electrically connected to a data power line interposed between the first and second data lines. The fourth switching element is electrically connected to a gate power line receiving a voltage having different polarity from a voltage applied to the data power line. Therefore, light transmittance, opening ratio and display quality are improved.
    Type: Grant
    Filed: February 3, 2009
    Date of Patent: May 1, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hwa-Sung Woo, Joo-Nyung Jang, Cheol Shin, Yoon-Sung Um, Mi-Jeong Song
  • Publication number: 20120098807
    Abstract: An active level shift (ALS) driver circuit and a liquid crystal display apparatus including the ALS driver circuit are disclosed. The ALS driver circuit includes an input unit configured to apply a first polarity voltage to a first node and to apply a second polarity voltage to a second node, a level compensation unit configured to adjust the voltages of the first node and the second node, and an output unit configured to alternately output a first power voltage and a second power voltage according to the adjusted voltages of the first and second nodes.
    Type: Application
    Filed: October 20, 2011
    Publication date: April 26, 2012
    Applicant: Samsung Mobile Display Co., Ltd.
    Inventors: Seung-Kyu Lee, Dong-Hoon Lee, Chul-Ho Kim, Kyung-Hoon Kim, Se-Hyang Kim
  • Patent number: 8164563
    Abstract: A liquid crystal display device includes a gate driver for generating a first scan signal voltage and a second scan signal voltage, a source driver for generating a first polarity data voltage and a second polarity data voltage, and a liquid crystal display panel having a first pixel set and a second pixel set. Each first and second pixel set includes a first pixel and a second pixel. Both the first pixel of the first pixel set and the second pixel of the second pixel set display grey level based on the first polarity data voltage in response to the first scan signal voltage. Both the second pixel of the first pixel set and the first pixel of the second pixel set display grey level based on the second polarity data voltage in response to the second scan signal voltage.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: April 24, 2012
    Assignee: AU Optronics Corp.
    Inventors: Sheng-chao Liu, Chen-ming Chen, Yung-chan Chou
  • Patent number: 8164558
    Abstract: The present invention relates to a driving method for a driver IC, comprising: detecting a polarity of a gate line being driven; when the polarity changes, the driver integrated circuit drives the gate line with a first mode signal; when the polarity does not change, the driver integrated circuit drives the gate line with a second mode signal, a driving current of the first mode signal is greater than that of the second mode signal. In the present invention, the driver IC drives a gate line in different driving modes according to a condition that a polarity of the droved gate line changes. Since a driving current of the first mode signal is greater than that of the second mode signal, the present invention is enabled to minimize a difference between charging delays of pixel electrodes on gate lines, improving a dim line phenomenon.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: April 24, 2012
    Assignee: Beijing Boe Optoelectronics Technology Co., Ltd.
    Inventor: Hyungkyu Kim
  • Patent number: 8164556
    Abstract: A liquid crystal display includes a liquid crystal display panel including a plurality of data lines, a plurality of gate lines crossing the plurality of data lines, and a plurality of liquid crystal cells defined as a first and second liquid crystal cell groups, a data driving circuit to supply a data voltage to the data lines in response to a polarity control signal, a gate driving circuit to supply a scanning pulse that swings between a gate high voltage and a gate low voltage to the gate lines, a first logic circuit to generate the polarity control signal differently for each frame period to maintain a polarity of the data voltage charged in the first liquid crystal cell group, and to invert one time a polarity of the data voltage charged in the second liquid crystal cell group for two frame periods, and a second logic circuit to control the gate driving circuit to decrease the gate high voltage of the scanning pulse to a modulated voltage between the gate high voltage and the gate low voltage for a prede
    Type: Grant
    Filed: December 31, 2007
    Date of Patent: April 24, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Hong Sung Song, Woong Ki Min, Su Hyuk Jang
  • Patent number: 8164557
    Abstract: In the case of conducting an overdriving with a liquid crystal display device, the circuit for comparing the previous and present gray-scale data, the circuit for converting the gray-scale data upon the comparison result, and the like complicate the structure of the liquid crystal display device. Further, since hold driving by which the voltage applied is kept throughout one frame period is conducted in a liquid crystal display device, it is not sufficient to decrease the rise time due to high applied voltage for a countermeasure against blur of moving images. In the present invention, in one frame period, a high voltage is applied to a liquid crystal element and a constant voltage is applied after the high voltage is applied. The absolute value of the high voltage is equal to or higher than the constant voltage, in other words, equal to or higher than a reference voltage.
    Type: Grant
    Filed: October 24, 2005
    Date of Patent: April 24, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Daisuke Kubota, Takeshi Nishi
  • Patent number: 8164562
    Abstract: A liquid crystal display includes: a plurality of gate lines which transmits gate signals having a gate-on voltage and a gate-off voltage; a plurality of data lines which transmits data voltages; a plurality of storage electrode lines which transmits storage signals; a plurality of pixels, wherein each pixel of the plurality of pixels includes a liquid crystal capacitor connected to a switching element and a common voltage, and a storage capacitor connected to the switching element and a storage electrode line of the plurality of storage electrode lines; a gate driver which generates the gate signals; and a plurality of signal generating circuits which generates the storage signals based on at least one control signal and at least one gate signal. The storage signal applied to each pixel has a voltage level which changes after a charging of the data voltage into the liquid crystal capacitor and the storage capacitor.
    Type: Grant
    Filed: October 5, 2007
    Date of Patent: April 24, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Myung-Woo Lee, Sang-Jin Pak
  • Publication number: 20120092241
    Abstract: A liquid crystal display comprising an array substrate formed with gate lines, data lines and pixel electrodes. Odd rows of pixel electrodes in the same column are connected with one of data lines at two sides of the column, even rows of pixel electrodes are connected with the other one of the data lines; pixel electrodes in the same row are controlled by one of the two gate lines at two sides of the row of pixel electrodes, pixel electrodes controlled by each gate line are located in the same row; there are two gate lines between two adjacent rows of pixel electrodes; two adjacent pixel electrodes in the same row between two adjacent data lines are controlled by one of the two gate lines at two sides of the row of pixel electrodes, and they are connected with one of the two adjacent data lines.
    Type: Application
    Filed: October 18, 2011
    Publication date: April 19, 2012
    Applicant: BOE TECHNOLOGY GROUP CO., LTD.
    Inventor: Guangliang SHANG
  • Patent number: 8159439
    Abstract: A data driving circuit receiving an image signal and applying a data signal based on the image signal to a display panel, the data driving circuit includes a signal generator that generates a horizontal scanning identical signal based on the image signal and a load signal instructing an output of the data signal to the display panel; a signal amplifier that alternately converts a polarity of an offset compensation value from positive to negative and amplifies the image signal based on the offset compensation value; and a controller that counts pulses of the horizontal scanning identical signal and controls the signal amplifier to retain the converted polarity of the offset compensation value until a counted reaches a predetermined reference value.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: April 17, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae-han Lee, Chang-soo Lee
  • Publication number: 20120086689
    Abstract: An embodiment of the present invention switches, in a display driving circuit of a liquid crystal display device which carries out CC driving, between a two-line reversal driving mode in which a polarity of a data signal supplied to a source line is reversed every two horizontal scanning periods and a one-line reversal driving mode in which a polarity of a data signal supplied to a source line is reversed every one horizontal scanning period. In at least one example embodiment, a polarity signal reverses its polarity every two horizontal scanning periods in the two-line reversal driving mode, and reverses its polarity every one horizontal scanning period in the one-line reversal driving mode.
    Type: Application
    Filed: February 28, 2010
    Publication date: April 12, 2012
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Shige Furuta, Etsuo Yamamoto, Yuhichiroh Murakami, Seijirou Gyouten
  • Patent number: 8155445
    Abstract: The present invention relates to an image processing method, an image processing apparatus and an image processing program for dealing with inverted characters (outlined characters) constituted by white pixels on a black ground in a tree structure same as that of normal characters constituted by black pixels on a white ground. In the present invention, black pixel blocks and white pixel blocks are sampled recursively from a binary image, tree structure data indicating a positional relation between the sampled black pixel blocks and white pixel blocks is created, an inverted image is created by white-black-inverting the insides of black pixel blocks that can include inverted characters, of black pixel blocks included in the tree structure data, white pixel blocks and black pixel blacks are sampled from the created inverted image, and data regarding the sampled white pixel blocks and black pixel blocs is added to corresponding nodes of the tree structure data.
    Type: Grant
    Filed: September 25, 2007
    Date of Patent: April 10, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomotoshi Kanatsu
  • Patent number: 8154497
    Abstract: A driving apparatus for a display device includes a plurality of pixels arranged in a matrix, and each pixel includes first and second sub-pixels. The driving apparatus includes a memory for storing digital data, a controller for calling the digital data to output the digital data together with a clock signal and at least one selection signal, and a gray voltage generator formed of an integrated circuit to receive the digital data from the controller and to generate gray reference voltage sets. The gray voltage generator includes first and second registers for storing the digital data, a selector including a plurality of multiplexers for receiving the outputs of the first and second registers, and a converter including a plurality of digital-analog converters connected to the multiplexers. As described above, the gray voltage generator is provided in the form of a chip so that it is possible to reduce the area occupied on a printed circuit board (PCB) and to reduce the cost of the gray voltage generator.
    Type: Grant
    Filed: June 23, 2006
    Date of Patent: April 10, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seung-Woo Lee, Tae-Sung Kim, Jae-Hyoung Park
  • Patent number: 8154495
    Abstract: The present invention discloses a method for improving the image quality of a MSHD (Multi-Switch Half source Driving) display panel and a device used the same. The method comprising following steps: First, using a polarity-line-inversion source driver to drive a plurality of pixels of a MSHD display panel, then a frame displaying in polarity-dot-inversion. The device comprises a polarity-line-inversion source driver and a MSHD display panel, wherein the polarity-line-inversion source driver drives a plurality of pixels of the MSHD display panel. The pixels of the MSHD display panel displays a frame in polarity-dot-inversion form.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: April 10, 2012
    Assignee: Au Optronics Corporation
    Inventor: Wen-Fa Hsu
  • Publication number: 20120075277
    Abstract: A liquid crystal display apparatus includes an active-matrix type display panel and a signal drive circuit. The active-matrix type display panel includes a pair of substrates, a liquid crystal layer interposed between the substrates, pixel electrodes arranged on one of the substrates in rows and columns, switching elements connected to the pixel electrodes, scan lines connected to the switching elements, and signal lines connected to the switching elements. Each signal line extends between two columns of the pixel electrodes, and any two pixel electrodes adjacent in the row direction use one signal line in common. One of two pixel electrodes is connected to an odd-numbered scan line, and the other of two pixel electrodes is connected to an even-numbered scan line. The signal drive circuit supplies display signals to the pixel electrodes through the signal lines, and to invert the display signal in polarity at every two other scan lines.
    Type: Application
    Filed: September 27, 2011
    Publication date: March 29, 2012
    Applicant: CASIO COMPUTER CO., LTD.
    Inventor: Ryuichi HIRAYAMA
  • Patent number: 8144098
    Abstract: A dot-matrix display data refresh charging/discharging control method and system is proposed, which is designed for integration to a dot-matrix display device for providing a data refresh charging/discharging control mechanism on the dot-matrix display device. The proposed method and system is characterized by the capability of prior to a data refresh action on each pixel, switching the pixel for connection to a voltage-neutralizing point for the purpose of neutralizing the current data voltage charge on the pixel to substantially approach zero voltage level; and subsequently during the data refresh action, charging a new data voltage into the pixel. This feature allows the operation of the dot-matrix display device to have faster speed and low power consumption.
    Type: Grant
    Filed: June 12, 2008
    Date of Patent: March 27, 2012
    Assignee: National Taiwan University
    Inventors: I-Yin Li, Jean-Fu Kiang
  • Patent number: 8144099
    Abstract: There is provided an liquid crystal display apparatus configured to invert a pixel voltage and a common voltage on a frame to frame basis while setting a transition voltage Vt in such a manner that the polarity of the pixel voltage to be applied to a pixel electrode of each display pixel and the polarity of the common voltage to be applied to a common electrode of a common substrate are differentiated.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: March 27, 2012
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Tetsuya Kojima, Tetsuo Fukami, Kazuhiro Nishiyama, Kenji Nakao
  • Patent number: 8144141
    Abstract: A liquid crystal display which may suppress image quality deterioration and enhance image contrast is provided. The liquid crystal display includes: a light source unit including a light source having divided lighting sections and a light source control section; a liquid crystal display panel including pixels and modulating light from the light source; and a display driving section performing a polarity inversion driving based on the inputted video signal. The display driving section corrects the inputted video signal, for each of divided display regions in the liquid crystal display panel corresponding to ON-state divided lighting sections, based on a light control signal from the light source control section, so that a amplitude center potential of the driving voltage with a waveform of alternately-inverting polarity substantially agrees with the common potential. The driving voltage based on a corrected video signal is then applied to the liquid crystal element.
    Type: Grant
    Filed: September 23, 2009
    Date of Patent: March 27, 2012
    Assignee: Sony Corporation
    Inventors: Yoichi Hirose, Tsuyoshi Kamada
  • Patent number: 8139012
    Abstract: A method of driving a liquid crystal device having an optically compensated bend mode and including an image display area including a plurality of pixels two-dimensionally arranged in a row direction in which a plurality of scanning lines extend and in a column direction in which a plurality of data lines extend. The method includes performing an initial transition of a liquid crystal alignment from a splay alignment to a bend alignment. The initial transition includes inversion driving for driving the plurality of pixels by using, among a plurality of inversion driving modes, one inversion driving mode for inverting relative polarities of voltages applied to the plurality of pixels, and different inversion driving for switching the inversion driving mode in the inversion driving to a different inversion driving mode before driving the plurality of pixels.
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: March 20, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Kosuke Fukui, Hiroyuki Hosaka
  • Patent number: 8139051
    Abstract: The present invention provides a driver, including: data lines disposed in parallel with each other; gate lines disposed in parallel with each other and at right angles to the data lines so as to be electrically insulated from the data lines; odd-numbered pixel cell connected to the odd-numbered data line from the head one, and the odd-numbered gate line from the head one; even-numbered pixel cell connected to the even-numbered data line from the head one, and the even-numbered gate line from the head one; driving means for driving the odd-numbered gate lines and the even-numbered gate lines independently of each other; inputting means for inputting a signal having a predetermined potential to each of the odd-numbered gate lines and the even-numbered gate lines; and comparing means for comparing potentials of the each adjacent odd-numbered data line and even-numbered data line with each other, and outputting a comparison result.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: March 20, 2012
    Assignee: Sony Corporation
    Inventor: Naoki Ando
  • Patent number: 8139013
    Abstract: An image display according to the present invention includes a driving device which performs pulse width modulation drive, restrains power consumption, and produces a good multi-tone display. The image display makes the difference between the scan line voltage and the signal line voltage equal in positive polarity writing and negative polarity writing by which pixels are AC driven, so as to make the on-resistances of transistors equal. This allows a maximum pulse width, the size of switching elements, etc. to be determined first so that they match positive polarity writing in which the resistances value of the switching elements rise. No high frequency clock is required to produce subtle differences of charge ratio in negative polarity writing in which the resistances of the switching elements fall. Power consumption which depends on the clock frequency drops too.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: March 20, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kouji Kumada, Takashige Ohta, Haruhito Kagawa
  • Patent number: 8130218
    Abstract: An electronic device of a source driver in an LCD device, for enhancing accuracy of voltage outputted to an equivalent capacitor of a panel of the LCD device, includes a first node, a second node, an output unit, a first charge sharing switch, a second charge sharing switch, a first precharge switch, and a second precharge switch. The electronic device only uses two precharge switches to implement the precharge function and can decrease the current limiting resistor for enhancing the output voltage accuracy and decrease the charge time of the equivalent capacitor.
    Type: Grant
    Filed: March 19, 2008
    Date of Patent: March 6, 2012
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Ji-Ting Chen, Ju-Lin Huang
  • Publication number: 20120050147
    Abstract: Respective lines forming a positive-polarity signal pixel circuit part, such as a Vdd line 102, a Cs1-connecting line 104 and a line 106 for a data line Di+, and respective lines forming a negative-polarity signal pixel circuit part, such as a Vdd line 103, a Cs2-connecting line 105 and a line 107 for a data line Di?, are arranged symmetrically to each other with respect to a pixel center line II-II?, respectively. Since the Vdd line 102 and the Vdd line 103 are positioned at right and left ends in one pixel, they serve as guard patterns to restrict crosstalk originating in either a Cs1-connecting line or a Cs2-connecting line of adjacent left and right pixels. The line 106 for the data line Di+ and the line 107 for the data line Di? are arranged in the vicinity of a central portion of the pixel.
    Type: Application
    Filed: August 23, 2011
    Publication date: March 1, 2012
    Applicant: JVC KENWOOD CORPORATION
    Inventor: Takayuki IWASA
  • Patent number: 8125438
    Abstract: In order to provide a reflection type liquid crystal display apparatus where, even when the pixel size is small, the crosstalk between a signal line and an end of a capacitor can be decreased, thus resulting in a good output image, by forming a signal line 2 for transmitting an image signal to each pixel with a second metal layer, by placing a shield line 12 between a capacitor electrode 10 constituting a capacitor and the signal line 2 with a first metal layer, and by giving a fixed potential, shielding is provided to prevent occurrence of cross-talk. The capacitor is configured with a common electrode 11 and a capacitor electrode 10, having a diffusion layer formed on a semiconductor substrate. By placing the capacitor electrode having a diffusion layer formed on the semiconductor substrate and the common electrode having a fixed potential below the signal line, shielding is provided to prevent occurrence of cross-talk.
    Type: Grant
    Filed: January 5, 2011
    Date of Patent: February 28, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masanobu Oomura
  • Publication number: 20120044225
    Abstract: A flat display device includes a flat panel including a plurality of gate lines; a first gate driving portion connected to odd gate lines among the plurality of gate lines; a second gate driving portion connected to even gate lines among the plurality of gate lines; a driving mode selection portion generating a driving mode signal corresponding to source output inputted thereto; and a timing control portion operating in a moving image mode or a still image mode in response to the driving mode signal, wherein the first and second gate driving portions alternately operate per a frame in the still image mode, or wherein the first and second gate driving portions alternately operate per a field in the moving image mode, in which the field is shorter than the frame.
    Type: Application
    Filed: August 18, 2011
    Publication date: February 23, 2012
    Inventors: Hak-su KIM, Myung-Jong Park
  • Patent number: 8120565
    Abstract: Display contrast in electro-optical display devices is improved using a drive circuit including pixel drive circuits and a common drive circuit. The pixel drive circuits are connected to pixel electrodes of the display device, and are operable to generate respective pixel drive signals that alternate between a first high voltage and a first low voltage differing in voltage by less than or equal to a process-limited maximum. The common drive circuit is connected to a common electrode of the display device, and is operable to generate a common drive signal alternating between a second high voltage and a second low voltage differing in voltage by more than the process-limited maximum. The common drive signal is asymmetrically bipolar with respect to the first low voltage of the pixel drive signal.
    Type: Grant
    Filed: February 4, 2004
    Date of Patent: February 21, 2012
    Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.
    Inventors: Ken A. Nishimura, Charles D. Hoke, Thomas A. Knotts
  • Publication number: 20120038834
    Abstract: In at least one embodiment a ripple, generated in an electric potential of data signal lines even in long-term reversal driving, is reduced and display quality is improved. In at least one example embodiment, the liquid crystal display apparatus of the present invention includes scanning signal lines and data signal lines, in which one scanning pulse is outputted to select one scanning signal line, each of the data signal lines receives data signals whose polarities are reversed per one vertical scanning period while in one horizontal scanning period, one of two data signal lines receives a data signal having a polarity and the other of the two data signal lines receives another data signal having another polarity, the two data signal lines being arranged adjacent to each other, scanning pulses are successively outputted in sets of two, and at a timing in which two scanning pulses fall, two scanning pulses rise.
    Type: Application
    Filed: February 9, 2010
    Publication date: February 16, 2012
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Masae Kitayama, Fumikazu Shimoshikiryoh, Kentaroh Irie