Patents by Inventor Ikumi Itsumi

Ikumi Itsumi 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).

  • Patent number: 9818348
    Abstract: A color display pixel PCD in a liquid crystal display device (100) includes first through fourth pixels P1 through P4 arrayed in two rows by two columns, and first and second signal lines (13a, 13b) which are located in correspondence with each column of pixels and are supplied with signal voltages of polarities opposite to each other from a signal line driving circuit (30) in each vertical scanning period. A TFT (14) of one of the first and third pixel P1 and P3 is connected to the first signal line (13a), and a TFT (14) of the other pixel is connected to the second signal line (13b). A TFT (14) of one of the second and fourth pixel P2 and P4 is connected to the first signal line (13a), and a TFT (14) of the other pixel is connected to the second signal line (13b).
    Type: Grant
    Filed: January 27, 2011
    Date of Patent: November 14, 2017
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Masae Kitayama, Mitsuaki Hirata, Fumikazu Shimoshikiryoh, Kenichi Hyodo, Ikumi Itsumi, Yuki Yamashita, Akane Sugisaka
  • Patent number: 9046728
    Abstract: The present invention is to provide a liquid crystal display device which hardly causes image sticking even when there is a difference in the pixel areas. The liquid crystal display device of the present invention includes a pair of substrates, and a liquid crystal layer sandwiched between the pair of substrates, and is configured such that a pixel is formed by picture elements of a plurality of colors.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: June 2, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Ikumi Itsumi, Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Yuki Yamashita, Akane Sugisaka, Fumikazu Shimoshikiryoh
  • Patent number: 9019186
    Abstract: A liquid crystal display device (100) according to the present invention has a plurality of pixels that are arranged in columns and rows to form a matrix pattern and one color display pixel (P) is comprised of four or any other larger even number of pixels. The liquid crystal display device (100) of the present invention includes a plurality of source bus lines (13) which run in a column direction. The even number of pixels that form one color display pixel (P) include larger pixels with a relatively large area and smaller pixels with a relatively small area. Each set of pixels to be supplied with a signal voltage from an associated one of the plurality of source bus lines (13) has substantially the same total area as any other set of pixels. According to the present invention, in a liquid crystal display device in which a plurality of pixels that forms one color display pixel includes the larger and smaller pixels, generation of display unevenness that runs in the column direction can be minimized.
    Type: Grant
    Filed: January 24, 2011
    Date of Patent: April 28, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Toshinori Sugihara, Toshihide Tsubata, Yuki Yamashita, Fumikazu Shimoshikiryoh, Mitsuaki Hirata, Kenichi Hyohdoh, Ikumi Itsumi, Akane Sugisaka, Masae Kitayama
  • Patent number: 8885131
    Abstract: A liquid crystal display device (100) according to the present invention includes a color display pixel D including pixels PA through PD arrayed in a matrix. The pixels PA through PD respectively include sub pixels SA1 through SD1and sub pixels SA2 through SD2. At least at an intermediate gray scale level, the luminance of the sub pixels SA2 through SD2 is higher than the luminance of the sub pixels SA1through SD1. The plurality of sub pixels S included in the pixels PA through PD are arrayed in a matrix. The sub pixel SA2 is adjacent to the sub pixel SB2 in the row direction, is adjacent to the sub pixel SC2 in the column direction, and is adjacent to the sub pixel SD2 in an oblique direction.
    Type: Grant
    Filed: January 27, 2011
    Date of Patent: November 11, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Ikumi Itsumi, Yuki Yamashita, Akane Sugisaka, Fumikazu Shimoshikiryoh
  • Patent number: 8749727
    Abstract: The present invention provides a liquid crystal display device which hardly causes image sticking in a panel in which Cgd gradation is performed, even when the pixel capacitances of the picture elements are different from one another.
    Type: Grant
    Filed: November 5, 2010
    Date of Patent: June 10, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Ikumi Itsumi, Fumikazu Shimoshikiryoh, Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Yuki Yamashita, Akane Sugisaka
  • Patent number: 8552953
    Abstract: To make a conventional area grayscale display technique applicable to a driving method that is designed to write data in a vertical blanking interval. A display panel with multiple pixels and a display controller that receives an input video signal and a sync signal and gets an image presented on the display panel are provided. If one horizontal scanning period and one vertical scanning period of the input video signal are represented by 1H and V-Total, respectively, the display controller is able to form one vertical scanning period V-Total of a first period in which one horizontal scanning period of the display panel is 1Ho, which is as long as 1H, and a second period in which one horizontal scanning period of the display panel is 1Hn, which is not as long as 1H.
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: October 8, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Fumikazu Shimoshikiryoh, Masae Kitayama, Ikumi Itsumi
  • Publication number: 20130250198
    Abstract: A liquid crystal display device according to the present invention includes: a plurality of pixels that are arranged in rows and columns so as to form a matrix pattern; and TFTs (TFT-A, TFT-B and TFT-C), source bus lines, gate bus lines and CS bus lines (CS-A and CS-B), which are associated with the respective pixels. Each pixel includes at least three subpixels (SP-A, SP-B and SP-C) with liquid crystal capacitors that are able to retain mutually different voltages. By supplying a signal (CS-A or CS-B) that makes two of the at least three subpixels display mutually different luminances at least at a certain grayscale tone from the source, gate and CS bus lines to each pixel, the at least three subpixels are able to display mutually different luminances.
    Type: Application
    Filed: May 9, 2013
    Publication date: September 26, 2013
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Fumikazu SHIMOSHIKIRYOH, Toshihide TSUBATA, Masanori TAKEUCHI, Masae KITAYAMA, Ikumi ITSUMI, Akihiro SHOHRAKU
  • Patent number: 8456583
    Abstract: A liquid crystal display device according to the present invention includes: a plurality of pixels that are arranged in rows and columns so as to form a matrix pattern; and TFTs (TFT-A, TFT-B and TFT-C), source bus lines, gate bus lines and CS bus lines (CS-A and CS-B), which are associated with the respective pixels. Each pixel includes at least three subpixels (SP-A, SP-B and SP-C) with liquid crystal capacitors that are able to retain mutually different voltages. By supplying a signal (CS-A or CS-B) that makes two of the at least three subpixels display mutually different luminances at least at a certain grayscale tone from the source, gate and CS bus lines to each pixel, the at least three subpixels are able to display mutually different luminances.
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: June 4, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Fumikazu Shimoshikiryoh, Toshihide Tsubata, Masanori Takeuchi, Masae Kitayama, Ikumi Itsumi, Akihiro Shohraku
  • Patent number: 8363175
    Abstract: A scanning signal line (16) has an opening (29) in the vicinity of an intersection with a data signal line (15). A first transistor (12a) includes two source electrodes (9ax and 9ay) which sandwich a drain electrode (8a); a source electrode (9ax) is connected to the data signal line (15) via a source extension electrode (10ax) stretched above the opening (29), and a source electrode (9ay) is connected to the data signal line (15) via a source extension electrode (10ay) provided off the scanning signal line (16). A second transistor (12b) includes two source electrodes (9bx and 9by) that sandwich a drain electrode (8b) therebetween. A source electrode (9bx) is connected to the data signal line (15) via a source extension electrode (10bx), and a source electrode (9by) is connected to the data signal line (15) via a source extension electrode (10by) off the scanning signal line.
    Type: Grant
    Filed: February 22, 2008
    Date of Patent: January 29, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Ikumi Itsumi, Toshihide Tsubata
  • Publication number: 20130002992
    Abstract: A liquid crystal display device (100) according to the present invention includes a color display pixel D including pixels PA through PD arrayed in a matrix. The pixels PA through PD respectively include sub pixels SA1 through SD1 and sub pixels SA2 through SD2. At least at an intermediate gray scale level, the luminance of the sub pixels SA2 through SD2 is higher than the luminance of the sub pixels SA1 through SD1. The plurality of sub pixels S included in the pixels PA through PD are arrayed in a matrix. The sub pixel SA2 is adjacent to the sub pixel SB2 in the row direction, is adjacent to the sub pixel SC2 in the column direction, and is adjacent to the sub pixel SD2 in an oblique direction.
    Type: Application
    Filed: January 27, 2011
    Publication date: January 3, 2013
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Ikumi Itsumi, Yuki Yamashita, Akane Sugisaka, Fumikazu Shimoshikiryoh
  • Publication number: 20120326954
    Abstract: The present invention is to provide a liquid crystal display device which hardly causes image sticking even when there is a difference in the pixel areas. The liquid crystal display device of the present invention includes a pair of substrates, and a liquid crystal layer sandwiched between the pair of substrates, and is configured such that a pixel is formed by picture elements of a plurality of colors.
    Type: Application
    Filed: October 26, 2010
    Publication date: December 27, 2012
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Ikumi Itsumi, Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Yuki Yamashita, Akane Sugisaka, Fumikazu Shimoshikiryoh
  • Publication number: 20120320297
    Abstract: The present invention provides a liquid crystal display device which hardly causes image sticking in a panel in which Cgd gradation is performed, even when the pixel capacitances of the picture elements are different from one another.
    Type: Application
    Filed: November 5, 2010
    Publication date: December 20, 2012
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Ikumi Itsumi, Fumikazu Shimoshikiryoh, Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Yuki Yamashita, Akane Sugisaka
  • Publication number: 20120320026
    Abstract: A color display pixel PCD in a liquid crystal display device (100) includes first through fourth pixels P1 through P4 arrayed in two rows by two columns, and first and second signal lines (13a, 13b) which are located in correspondence with each column of pixels and are supplied with signal voltages of polarities opposite to each other from a signal line driving circuit (30) in each vertical scanning period. A TFT (14) of one of the first and third pixel P1 and P3 is connected to the first signal line (13a), and a TFT (14) of the other pixel is connected to the second signal line (13b). A TFT (14) of one of the second and fourth pixel P2 and P4 is connected to the first signal line (13a), and a TFT (14) of the other pixel is connected to the second signal line (13b).
    Type: Application
    Filed: January 27, 2011
    Publication date: December 20, 2012
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Masae Kitayama, Mitsuaki Hirata, Fumikazu Shimoshikiryoh, Kenichi Hyodo, Ikumi Itsumi, Yuki Yamashita, Akane Sugisaka
  • Publication number: 20120306732
    Abstract: A liquid crystal display device (100) according to the present invention has a plurality of pixels that are arranged in columns and rows to form a matrix pattern and one color display pixel (P) is comprised of four or any other larger even number of pixels. The liquid crystal display device (100) of the present invention includes a plurality of source bus lines (13) which run in a column direction. The even number of pixels that form one color display pixel (P) include larger pixels with a relatively large area and smaller pixels with a relatively small area. Each set of pixels to be supplied with a signal voltage from an associated one of the plurality of source bus lines (13) has substantially the same total area as any other set of pixels. According to the present invention, in a liquid crystal display device in which a plurality of pixels that forms one color display pixel includes the larger and smaller pixels, generation of display unevenness that runs in the column direction can be minimized.
    Type: Application
    Filed: January 24, 2011
    Publication date: December 6, 2012
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Toshinori Sugihara, Toshihide Tsubata, Yuki Yamashita, Fumikazu Shimoshikiryoh, Mitsuaki Hirata, Kenichi Hyohdoh, Ikumi Itsumi, Akane Sugisaka, Masae Kitayama
  • Patent number: 8319906
    Abstract: A scanning signal line (16) includes an opening (29) leading from the outside of a pixel region through below a data signal line (15) into the pixel region, and first and second scanning electrode portions (16a/16b) or two side portions of the opening confronting in a column direction through that opening. The end portion of the first scanning electrode portion (16a) in the pixel region is a first end portion (EP1), and the end portion of the second scanning electrode portion (16b) in the pixel region is a second end portion (EP2). A first transistor has a source electrode (9a) and a drain electrode (8a) individually overlapping the first electrode portion (16a) but not the first end portion (EP1) in the pixel region. A second transistor has a source electrode (9b) and a drain electrode (8b) individually overlapping the second electrode portion (16b) but not the second end portion EP2) in the pixel region.
    Type: Grant
    Filed: October 29, 2007
    Date of Patent: November 27, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kenji Enda, Ikumi Itsumi, Toshihide Tsubata, Masanori Takeuchi
  • Publication number: 20120274889
    Abstract: The present invention is to provide a liquid crystal display device which hardly causes image sticking even when there is a difference in the picture element areas. The liquid crystal display device of the present invention includes a pair of substrates, and a liquid crystal layer sandwiched between the pair of substrates, and is configured such that a pixel is formed by picture elements of a plurality of colors.
    Type: Application
    Filed: October 26, 2010
    Publication date: November 1, 2012
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Akane Sugisaka, Mitsuaki Hirata, Kenichi Hyohdoh, Masae Kitayama, Ikumi Itsumi, Yuki Yamashita, Fumikazu Shimoshikiryoh
  • Patent number: 8045073
    Abstract: The present invention provides a liquid crystal display device which can more improve a luminance when the liquid crystal display device includes a column spacer. The present invention is a liquid crystal display device including a pair of substrates and a liquid crystal layer interposed between the pair of substrates, and the liquid crystal display device having a red pixel, a green pixel, and a blue pixel, wherein a column spacer structure is arranged in the red pixel among three pixels of the red, green, and blue pixels, and the red pixel has the smallest aperture ratio of the three pixels.
    Type: Grant
    Filed: September 20, 2007
    Date of Patent: October 25, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Ikumi Itsumi, Fumikazu Shimoshikiryoh, Masae Kawabata
  • Publication number: 20100141849
    Abstract: A scanning signal line (16) includes an opening (29) leading from the outside of a pixel region through below a data signal line (15) into the pixel region, and first and second scanning electrode portions (16a/16b) or two side portions of the opening confronting in a column direction through that opening. The end portion of the first scanning electrode portion (16a) in the pixel region is a first end portion (EP1), and the end portion of the second scanning electrode portion (16b) in the pixel region is a second end portion (EP2). A first transistor has a source electrode (9a) and a drain electrode (8a) individually overlapping the first electrode portion (16a) but not the first end portion (EP1) in the pixel region. A second transistor has a source electrode (9b) and a drain electrode (8b) individually overlapping the second electrode portion (16b) but not the second end portion EP2) in the pixel region.
    Type: Application
    Filed: October 29, 2007
    Publication date: June 10, 2010
    Inventors: Kenji Enda, Ikumi Itsumi, Toshihide Tsubata, Masanori Takeuchi
  • Publication number: 20100109989
    Abstract: A scanning signal line (16) has an opening (29) in the vicinity of an intersection with a data signal line (15). A first transistor (12a) includes two source electrodes (9ax and 9ay) which sandwich a drain electrode (8a); a source electrode (9ax) is connected to the data signal line (15) via a source extension electrode (10ax) stretched above the opening (29), and a source electrode (9ay) is connected to the data signal line (15) via a source extension electrode (10ay) provided off the scanning signal line (16). A second transistor (12b) includes two source electrodes (9bx and 9by) that sandwich a drain electrode (8b) therebetween. A source electrode (9bx) is connected to the data signal line (15) via a source extension electrode (10bx), and a source electrode (9by) is connected to the data signal line (15) via a source extension electrode (10by) off the scanning signal line.
    Type: Application
    Filed: February 22, 2008
    Publication date: May 6, 2010
    Inventors: Ikumi Itsumi, Toshihide Tsubata
  • Publication number: 20100103339
    Abstract: A liquid crystal display device according to the present invention includes: a plurality of pixels that are arranged in rows and columns so as to form a matrix pattern; and TFTs (TFT-A, TFT-B and TFT-C), source bus lines, gate bus lines and CS bus lines (CS-A and CS-B), which are associated with the respective pixels. Each pixel includes at least three subpixels (SP-A, SP-B and SP-C) with liquid crystal capacitors that are able to retain mutually different voltages. By supplying a signal (CS-A or CS-B) that makes two of the at least three subpixels display mutually different luminances at least at a certain grayscale tone from the source, gate and CS bus lines to each pixel, the at least three subpixels are able to display mutually different luminances.
    Type: Application
    Filed: March 6, 2008
    Publication date: April 29, 2010
    Inventors: Fumikazu Shimoshikiryoh, Toshihide Tsubata, Masanori Takeuchi, Masae Kitayama, Ikumi Itsumi, Akihiro Shohraku