Patents by Inventor Koichi Katagawa
Koichi Katagawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9470900Abstract: A display unit includes: a display section having a plurality of pixels in a first group and a plurality of pixels in a second group, and performing a display operation by switching a display based on a first type of frame image during a first period and a display based on a second type of frame image during a second period; and a driving section performing a first driving to drive the plurality of pixels in the first group without driving the plurality of pixels in the second group during the first period, and performing a second driving to drive the plurality of pixels in the second group without driving the plurality of pixels in the first group during the second period.Type: GrantFiled: July 16, 2013Date of Patent: October 18, 2016Assignee: SONY CORPORATIONInventors: Yuji Nakahata, Koichi Katagawa
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Patent number: 8823623Abstract: A liquid crystal driver is provided, in which a frame rate of an input image signal is multiplied by 2N (N is an integer of one or more); each frame is divided into N positive field(s) and N negative field(s) respectively; the image signal is supplied to a liquid crystal panel with a positive polarity in a positive field; and the image signal is supplied to the liquid crystal panel with a negative polarity in a negative field. The liquid crystal driver includes a corrected image signal generator configured to generate a corrected image signal having the same amount of correction added to the positive field and negative field. The corrected image signal is supplied to the liquid crystal panel with the positive polarity in the positive field and the corrected image signal is supplied to the liquid crystal panel with the negative polarity in the negative field.Type: GrantFiled: October 17, 2007Date of Patent: September 2, 2014Assignee: Sony CorporationInventors: Koichi Katagawa, Hideo Morita, Yoshiki Shirochi, Hideaki Kawaura
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Publication number: 20140028741Abstract: A display unit includes: a display section having a plurality of pixels in a first group and a plurality of pixels in a second group, and performing a display operation by switching a display based on a first type of frame image during a first period and a display based on a second type of frame image during a second period; and a driving section performing a first driving to drive the plurality of pixels in the first group without driving the plurality of pixels in the second group during the first period, and performing a second driving to drive the plurality of pixels in the second group without driving the plurality of pixels in the first group during the second period.Type: ApplicationFiled: July 16, 2013Publication date: January 30, 2014Inventors: YUJI NAKAHATA, KOICHI KATAGAWA
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Patent number: 8547316Abstract: A display apparatus includes a display panel, a panel substrate including a data line driver, a controller connected to the panel substrate, and a connection unit provided in the panel substrate. The controller selects M signal lines from N signal lines (M is a natural number satisfying M?N) in accordance with a frame rate of a video data, and transmits M-phase video data to the panel substrate via the selected M signal lines. The data line driver controls the switching circuits of the connection unit in accordance with the frame rate of the video data to connect the M signal lines via which the video data is transmitted, to the data lines, and sequentially selects the M data lines to supply each piece of the video data transmitted via the M signal lines to each pixel connected to the selected M data lines.Type: GrantFiled: August 25, 2008Date of Patent: October 1, 2013Assignee: Sony CorporationInventors: Yusuke Doi, Tomoro Yoshinaga, Naoki Ando, Seisan Hoshimoto, Kouji Tada, Tomoaki Kichimi, Koichi Katagawa
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Publication number: 20130208024Abstract: Provided are an image processing method, an image processing device, an image processing circuit, and an image display unit that allow occurrence of a crosstalk to be reduced. When an image signal Din is input, the image signal Din is converted into an image signal D?in with a narrower dynamic range based on a lookup table (53A) on a dynamic range control section (51). At this time, the dynamic range of the image signal D?in is set up to an extent of avoiding saturation in an overdrive correction. Subsequently, an image signal Dout is generated by performing the overdrive correction for the image signal D?in using the lookup table (53A) on an overdrive control section (52).Type: ApplicationFiled: April 28, 2011Publication date: August 15, 2013Applicant: SONY CORPORATIONInventors: Kyoichiro Oda, Koichi Katagawa, Masayuki Takahashi, Atsushi Ito, Masahiko Nakahama
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Patent number: 8432347Abstract: A drive control circuit includes a timing controller for detecting a change of a horizontal scanning frequency, a gate voltage generating circuit for generating two kinds of gate-on voltages Va and Vb (Va<Vb), and a switch for outputting one of the gate-on voltages Va and Vb from the gate voltage generating circuit in accordance with an output of the timing controller. The timing controller includes a counter for counting the number of clocks for one horizontal period, and a comparator for comparing a count result with a threshold value. When the horizontal scanning frequency is in a normal state, the low gate-on voltage Va is outputted, and when the horizontal scanning frequency exceeds a predetermined threshold value, that is, the count value falls below a threshold value, the high gate-on voltage Vb is outputted.Type: GrantFiled: January 11, 2008Date of Patent: April 30, 2013Assignee: Sharp Kabushiki KaishaInventors: Katsuyoshi Hiraki, Yasutake Furukoshi, Koichi Katagawa, Masanori Nishido, Tetsuya Kobayashi
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Patent number: 8421742Abstract: A liquid crystal display device includes a panel having pixel electrodes arranged at intersections of a plurality of signal lines via switching elements for transmitting display data and a plurality of scanning lines for transmitting control signals, and a control circuit for controlling the panel. The liquid crystal panel is divided into first pixel regions and second pixel regions adjacent to the first pixel regions. The control circuit carries out impulse driving in which the control signals transmitted to each of the scanning lines are activated two times in one frame period for displaying an image. The control circuit writes the display data in either one of the pixel regions and writes reset data in the other pixel regions when the control signals are activated once of the two times. By writing the reset data in the pixel regions, the display data written in an immediately preceding frame are reset.Type: GrantFiled: May 18, 2010Date of Patent: April 16, 2013Assignee: Sharp Kabushiki KaishaInventors: Hidefumi Yoshida, Seiji Tanuma, Takatoshi Mayama, Yuichi Inoue, Toshiaki Suzuki, Kazutaka Hanaoka, Takeshi Gotoh, Tetsuya Kobayashi, Makoto Ohashi, Hisashi Yamaguchi, Katsunori Tanaka, Koichi Katagawa
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Patent number: 8279165Abstract: A liquid crystal display device includes a panel having pixel electrodes arranged at intersections of a plurality of signal lines via switching elements for transmitting display data and a plurality of scanning lines for transmitting control signals, and a control circuit for controlling the panel. The liquid crystal panel is divided into first pixel regions and second pixel regions adjacent to the first pixel regions. The control circuit carries out impulse driving in which the control signals transmitted to each of the scanning lines are activated two times in one frame period for displaying an image. The control circuit writes the display data in either one of the pixel regions and writes reset data in the other pixel regions when the control signals are activated once of the two times. By writing the reset data in the pixel regions, the display data written in an immediately preceding frame are reset.Type: GrantFiled: May 18, 2010Date of Patent: October 2, 2012Assignee: Sharp Kabushiki KaishaInventors: Hidefumi Yoshida, Seiji Tanuma, Takatoshi Mayama, Yuichi Inoue, Toshiaki Suzuki, Kazutaka Hanaoka, Takeshi Gotoh, Tetsuya Kobayashi, Makoto Ohashi, Hisashi Yamaguchi, Katsunori Tanaka, Koichi Katagawa
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Publication number: 20120001951Abstract: A liquid crystal display includes: a light source section; a liquid crystal display panel including pixels corresponding to a plurality of colors; an overdrive processing section performing predetermined overdrive processing on an input picture signal; a gain correction section performing a predetermined gain correction on the overdrive-processed picture signal; and a drive section performing a display-drive based on the gain-corrected picture signal. The liquid crystal display panel includes a pair of substrates and liquid crystal cells forming the pixels. A plurality of values corresponding to respective colors of the pixels are provided for cell gaps of the liquid crystal cells. The overdrive processing section performs common overdrive processing for pixels of respective colors, and the gain correction section performs different gain corrections corresponding to respective values of the cell gaps.Type: ApplicationFiled: June 13, 2011Publication date: January 5, 2012Applicant: Sony CorporationInventor: Koichi KATAGAWA
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Patent number: 7982842Abstract: An interconnect structure for a display device includes a driver from which display data are supplied, and an interconnect material having a plurality of signal lines disposed in parallel through which the display data are supplied from the driver. In the interconnect structure for a display device, the signal lines from which the display data are transmitted via the interconnect material are rearranged such that the display data via the signal lines having a comparatively larger effect of the inductance components and the display data via the signal lines having a comparatively smaller effect of the inductance components in the interconnect material are alternately supplied to adjacent pixels or groups of pixels of the display device. As a result, an image is displayed based on the luminance suitable for the display data.Type: GrantFiled: January 12, 2007Date of Patent: July 19, 2011Assignee: Sony CorporationInventors: Hideaki Kawaura, Koichi Katagawa, Hiroshi Sata
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Patent number: 7969427Abstract: A display panel control device comprises a first buffer, to which a current-frame data, is written in synchronization with a sync signal, and from which the written current-frame data is read in synchronization with a fast sync signal faster than the sync signal to be written to a frame memory, and a second buffer, to which the previous-frame data read from the frame memory is written in synchronization with the fast sync signal faster than the sync signal, and from which the written previous-frame data is read in synchronization with the above sync signal, for supply to the above driving data generation unit.Type: GrantFiled: March 23, 2005Date of Patent: June 28, 2011Assignees: Fujitsu Limited, Au Optronics CorporationInventor: Koichi Katagawa
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Publication number: 20100225681Abstract: A liquid crystal display device includes a panel having pixel electrodes arranged at intersections of a plurality of signal lines via switching elements for transmitting display data and a plurality of scanning lines for transmitting control signals, and a control circuit for controlling the panel. The liquid crystal panel is divided into first pixel regions and second pixel regions adjacent to the first pixel regions. The control circuit carries out impulse driving in which the control signals transmitted to each of the scanning lines are activated two times in one frame period for displaying an image. The control circuit writes the display data in either one of the pixel regions and writes reset data in the other pixel regions when the control signals are activated once of the two times. By writing the reset data in the pixel regions, the display data written in an immediately preceding frame are reset.Type: ApplicationFiled: May 18, 2010Publication date: September 9, 2010Applicant: SHARP KABUSHIKI KAISHAInventors: Hidefumi Yoshida, Seiji Tanuma, Takatoshi Mayama, Yuichi Inoue, Toshiaki Suzuki, Kazutaka Hanaoka, Takeshi Gotoh, Tetsuya Kobayashi, Makoto Ohashi, Hisashi Yamaguchi, Katsunori Tanaka, Koichi Katagawa
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Publication number: 20100225633Abstract: A liquid crystal display device includes a panel having pixel electrodes arranged at intersections of a plurality of signal lines via switching elements for transmitting display data and a plurality of scanning lines for transmitting control signals, and a control circuit for controlling the panel. The liquid crystal panel is divided into first pixel regions and second pixel regions adjacent to the first pixel regions. The control circuit carries out impulse driving in which the control signals transmitted to each of the scanning lines are activated two times in one frame period for displaying an image. The control circuit writes the display data in either one of the pixel regions and writes reset data in the other pixel regions when the control signals are activated once of the two times. By writing the reset data in the pixel regions, the display data written in an immediately preceding frame are reset.Type: ApplicationFiled: May 18, 2010Publication date: September 9, 2010Applicant: SHARP KABUSHIKI KAISHAInventors: Hidefumi Yoshida, Seiji Tanuma, Takatoshi Mayama, Yuichi Inoue, Toshiaki Suzuki, Kazutaka Hanaoka, Takeshi Gotoh, Tetsuya Kobayashi, Makoto Ohashi, Hisashi Yamaguchi, Katsunori Tanaka, Koichi Katagawa
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Patent number: 7764261Abstract: A liquid crystal display device includes a panel having pixel electrodes arranged at intersections of a plurality of signal lines via switching elements for transmitting display data and a plurality of scanning lines for transmitting control signals, and a control circuit for controlling the panel. The liquid crystal panel is divided into first pixel regions and second pixel regions adjacent to the first pixel regions. The control circuit carries out impulse driving in which the control signals transmitted to each of the scanning lines are activated two times in one frame period for displaying an image. The control circuit writes the display data in either one of the pixel regions and writes reset data in the other pixel regions when the control signals are activated once of the two times. By writing the reset data in the pixel regions, the display data written in an immediately preceding frame are reset.Type: GrantFiled: February 17, 2006Date of Patent: July 27, 2010Assignee: Sharp Kabushiki KaishaInventors: Hidefumi Yoshida, Seiji Tanuma, Takatoshi Mayama, Yuichi Inoue, Toshiaki Suzuki, Kazutaka Hanaoka, Takeshi Gotoh, Tetsuya Kobayashi, Makoto Ohashi, Hisashi Yamaguchi, Katsunori Tanaka, Koichi Katagawa
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Patent number: 7595780Abstract: The liquid crystal display device has a liquid crystal panel in which liquid crystal cells are disposed in intersection areas of scanning lines and data lines, respectively. A picture signal and a synchronous signal are supplied via external terminals, respectively. A timing controller generates a driving timing of the scanning lines and a driving timing of the data lines in response to the synchronous signal. Further, the timing controller varies at least one of the driving timing of the scanning lines and the driving timing of the data lines according to a cycle of the synchronous signal in order to keep a writing time of the picture signal supplied to the liquid crystal cells constant. Therefore, it is possible to keep the writing time constant even when the cycle of the synchronous signal varies, which can prevent the deterioration in display quality.Type: GrantFiled: July 28, 2004Date of Patent: September 29, 2009Assignees: Fujitsu Limited, Au Optronics CorporationInventors: Koichi Katagawa, Yasutake Furukoshi, Katsuyoshi Hiraki
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Patent number: 7592994Abstract: A liquid crystal display apparatus includes a liquid crystal display unit, a plurality of data driving units which provide image data to said liquid crystal display unit, and a control unit which enables said plurality of data driving units to take in the image data simultaneously if the image data to be provided to said data driving units are identical.Type: GrantFiled: September 30, 2004Date of Patent: September 22, 2009Assignee: Sharp Kabushiki KaishaInventors: Satoshi Sekido, Takae Ito, Shinpei Nagatani, Hidefumi Yoshida, Takashi Sasabayashi, Koichi Katagawa, Katsuhiko Kishida, Mikio Oshiro, Katsunori Tanaka, Toshimitsu Minemura, Katsuyoshi Hiraki, Yuichi Inoue
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Publication number: 20090058763Abstract: A display apparatus includes a display panel, a panel substrate including a data line driver, a controller connected to the panel substrate, and a connection unit provided in the panel substrate. The controller selects M signal lines from N signal lines (M is a natural number satisfying M?N) in accordance with a frame rate of a video data, and transmits M-phase video data to the panel substrate via the selected M signal lines. The data line driver controls the switching circuits of the connection unit in accordance with the frame rate of the video data to connect the M signal lines via which the video data is transmitted, to the data lines, and sequentially selects the M data lines to supply each piece of the video data transmitted via the M signal lines to each pixel connected to the selected M data lines.Type: ApplicationFiled: August 25, 2008Publication date: March 5, 2009Applicant: SONY CORPORATIONInventors: Yusuke Doi, Tomoro Yoshinaga, Naoki Ando, Seisan Hoshimoto, Kouji Tada, Tomoaki Kichimi, Koichi Katagawa
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Publication number: 20080284707Abstract: A liquid crystal driver is provided, in which a frame rate of an input image signal is multiplied by 2N (N is an integer of one or more); each frame is divided into N positive field(s) and N negative field(s) respectively; the image signal is supplied to a liquid crystal panel with a positive polarity in a positive field; and the image signal is supplied to the liquid crystal panel with a negative polarity in a negative field. The liquid crystal driver includes a corrected image signal generator configured to generate a corrected image signal having the same amount of correction added to the positive field and negative field. The corrected image signal is supplied to the liquid crystal panel with the positive polarity in the positive field and the corrected image signal is supplied to the liquid crystal panel with the negative polarity in the negative field.Type: ApplicationFiled: October 17, 2007Publication date: November 20, 2008Inventors: Koichi Katagawa, Hideo Morita, Yoshiki Shirochi, Hideaki Kawaura
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Patent number: 7382343Abstract: Polarity patterns (polarity pattern signal POL) are stored in a ROM in a polarity pattern controlling portion. Then, the polarity pattern is changed according to applications of a liquid crystal display panel. Since the polarity pattern is stored in the ROM, the polarity pattern can be changed without modification of a hardware. Also, two sets of polarity patterns or more are stored in the ROM, and then any one polarity pattern can be output according to the application. In addition, the polarity pattern signal POL and image signals RGB are compared with each other, and then the polarity pattern which is to be read from the ROM is switched according to the result.Type: GrantFiled: September 24, 2003Date of Patent: June 3, 2008Assignee: Sharp Kabushiki KaishaInventors: Katsuyoshi Hiraki, Takae Ito, Toshiaki Suzuki, Seiji Hayashimoto, Masaki Miyahara, Toshimitsu Minemura, Koichi Katagawa, Satoshi Sekido, Yasutake Furukoshi
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Publication number: 20080122778Abstract: A drive control circuit supplies a gate voltage so that display quality is not degraded even in a case where a vertical scanning frequency or a horizontal scanning frequency is changed. The circuit includes a timing controller for detecting a change of a horizontal scanning frequency, a gate voltage generating circuit for generating two kinds of gate-on voltages Va and Vb (Va<Vb), and a switch for outputting one of the gate-on voltages Va and Vb from the gate voltage generating circuit in accordance with an output of the timing controller. The timing controller includes a counter for counting the number of clocks for one horizontal period, and a comparator for comparing a count result with a threshold value. When the horizontal scanning frequency is in a normal state, the low gate-on voltage Va is outputted, and when the horizontal scanning frequency exceeds a predetermined threshold value, that is, the count value falls below a threshold value, the high gate-on voltage Vb is outputted.Type: ApplicationFiled: January 11, 2008Publication date: May 29, 2008Applicant: Sharp Kabushiki KaishaInventors: Katsuyoshi Hiraki, Yasutake Furukoshi, Koichi Katagawa, Masanori Nishido, Tetsuya Kobayashi