Patents by Inventor Keiichiro Ashizawa

Keiichiro Ashizawa 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).

  • Publication number: 20120057113
    Abstract: An active matrix type liquid crystal display device includes first and second substrates, a liquid crystal layer disposed between the first and second substrates, a plurality of pixel regions formed by image signal lines and scan signal lines, a semiconductor layer, a pixel electrode, a counter electrode formed on the first substrate in a pixel region, and a metal layer and a transparent conductive layer. The metal layer is completely covered by the transparent conductive layer when viewed in cross-section.
    Type: Application
    Filed: August 10, 2011
    Publication date: March 8, 2012
    Inventors: Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Kazuhiko Yanagawa, Masahiro Yanai, Nobutake Konishi, Nobuyuki Suzuki, Masahiro Ishii, Makoto Yoneya, Sukekazu Aratani
  • Publication number: 20120008076
    Abstract: An active matrix type liquid crystal display device includes first and second substrates, a liquid crystal layer disposed between the first and second substrates, a plurality of pixel regions formed by image signal lines and scan signal lines, and a semiconductor layer, a pixel electrode, a counter electrode formed on the first substrate in a pixel region. The pixel electrode is arranged at level which is lower than a level of the semiconductor layer.
    Type: Application
    Filed: August 10, 2011
    Publication date: January 12, 2012
    Inventors: Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Kazuhiko Yanagawa, Masahiro Yanai, Nobutake Konishi, Nobuyuki Suzuki, Masahiro Ishii, Makoto Yoneya, Sukekazu Aratani
  • Publication number: 20110234961
    Abstract: A liquid crystal display device includes a first substrate, a second substrate, a first electrode and a second electrode formed on the first substrate, the second electrode being arranged at an upper layer with respect to the first electrode, a drain signal line and a gate signal line formed on the first substrate, and a liquid crystal layer driven by an electric field formed between the first electrode and the second electrode. The first electrode extends in parallel to the drain signal lien and the second electrode extends at a slanted direction to the drain signal line.
    Type: Application
    Filed: June 3, 2011
    Publication date: September 29, 2011
    Inventors: Masuyuki Ohta, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Patent number: 8027005
    Abstract: An active matrix liquid crystal display device includes first and second substrates, a liquid crystal layer disposed between the first and second substrates, and plural image signal lines and scan signal lines formed on the first substrate. Respective pixel regions are formed by adjacent image signal lines and adjacent scan signal lines, and the respective pixel regions have at least one of a semiconductor layer, a pixel electrode, a counter electrode, and a source electrode which has a high-melting-point metal layer and an aluminum layer formed on the high-melting-point metal layer; wherein the high-melting-point layer enables connection of the semiconductor layer and the pixel electrode, and the pixel electrode is formed between the high-melting-point metal layer and the first substrate; and wherein a part of the scan signal lines positioned between the pixel regions and the gate terminal is covered by an ITO layer electrically connected to the counter electrode.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: September 27, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Kazuhiko Yanagawa, Masahiro Yanai, Nobutake Konishi, Nobuyuki Suzuki, Masahiro Ishii, Makoto Yoneya, Sukekazu Aratani
  • Publication number: 20110228199
    Abstract: A liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer sandwiched between the first and second substrates, and an orientation film formed on the first substrate. The orientation film has two orientation regions in a pixel, and the orientation regions are formed by polarized light.
    Type: Application
    Filed: June 3, 2011
    Publication date: September 22, 2011
    Inventors: Masuyuki Ohta, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Patent number: 7956973
    Abstract: A liquid crystal display device includes a first substrate and a second substrate with a liquid crystal material sandwiched therebetween, neighboring first, second, third and fourth regions arranged in a rectangular shape and in a clockwise direction, the first, second, third and fourth regions having a first pixel electrode, a second pixel electrode, a third pixel electrode and a fourth pixel electrode, respectively. The first pixel electrode and the third pixel electrode extend in a parallel direction to one another, and the second pixel electrode and the fourth pixel electrode extend in a parallel direction to one another.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: June 7, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Masuyuki Ohta, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Publication number: 20110080537
    Abstract: A liquid crystal display device with a pair of substrates which are arranged to face each other with liquid crystal therebetween, columnar spacers having the substantially equal height formed on a liquid-crystal-side surface of one substrate, and the columnar spacers include the columnar spacer which is contact with a liquid-crystal-side surface of another substrate and the columnar spacer which is not contact with the liquid-crystal-side surface of another substrate.
    Type: Application
    Filed: December 8, 2010
    Publication date: April 7, 2011
    Inventors: Keiichiro Ashizawa, Mitsuo Nakatani, Hiroaki Miwa, Takao Tanaka, Sadafumi Hirai, Shinichi Kawabe, Makoto Sasaki, Kazuyuki Ito, Masahiro Ieda
  • Patent number: 7872725
    Abstract: A liquid crystal display device with a pair of substrates which are arranged to face each other with liquid crystal therebetween, columnar spacers having the substantially equal height formed on a liquid-crystal-side surface of one substrate, and the columnar spacers include the columnar spacer which is contact with a liquid-crystal-side surface of another substrate and the columnar spacer which is not contact with the liquid-crystal-side surface of another substrate.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: January 18, 2011
    Assignee: Hitachi Displays, Ltd.
    Inventors: Keiichiro Ashizawa, Mitsuo Nakatani, Hiroaki Miwa, Takao Tanaka, Sadafumi Hirai, Shinichi Kawabe, Makoto Sasaki, Kazuyuki Ito, Masahiro Ieda
  • Patent number: 7773189
    Abstract: A liquid crystal display device is provided that includes a pair of substrates which are arranged to face each other with a liquid crystal therebetween, and columnar spacers that are substantially equal in height formed on a liquid-crystal-side surface of one of the pair of substrates, where the columnar spacers include a first columnar spacer which is in contact with a liquid-crystal-side surface of the other substrate of the pair of substrates and a second columnar spacer which is not contact with the liquid-crystal-side surface of that other substrate.
    Type: Grant
    Filed: May 5, 2008
    Date of Patent: August 10, 2010
    Assignee: Hitachi Displays, Ltd.
    Inventors: Keiichiro Ashizawa, Mitsuo Nakatani, Hiroaki Miwa, Takao Tanaka, Sadafumi Hirai, Shinichi Kawabe, Makoto Sasaki, Kazuyuki Ito, Masahiro Ieda
  • Publication number: 20100195038
    Abstract: An active matrix liquid crystal display device includes first and second substrates, a liquid crystal layer disposed between the first and second substrates, and plural image signal lines and scan signal lines formed on the first substrate. Respective pixel regions are formed by adjacent image signal lines and adjacent scan signal lines, and the respective pixel regions have at least one of a semiconductor layer, a pixel electrode, a counter electrode, and a source electrode which connects the semiconductor layer to the pixel electrode. The pixel electrode is formed between the source electrode and the first substrate.
    Type: Application
    Filed: April 15, 2010
    Publication date: August 5, 2010
    Inventors: Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Kazuhiko Yanagawa, Masahiro Yanai, Nobutake Konishi, Nobuyuki Suzuki, Masahiro Ishii, Makoto Yoneya, Sukekazu Aratani
  • Patent number: 7760319
    Abstract: A display device includes first and second substrates with a liquid crystal layer therebetween, video signal lines and scan lines on one of the substrates, and display electrodes connected to a video signal line through an active device. Pixel areas are defined by the video signal and scan signal lines, and each pixel area has the display electrode, a reference electrode and the active device. Display electrodes are arranged on the first substrate and reference electrodes are arranged the second substrate. A part of the reference electrodes have a plurality layers and is conductive. A sealing material is formed between the substrates and along a periphery thereof and include conductive beads. A connecting terminal is formed from an edge of the first substrate to under the sealing material, and is connected electrically to the reference electrodes thorough the sealing material.
    Type: Grant
    Filed: August 4, 2008
    Date of Patent: July 20, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi
  • Patent number: 7751020
    Abstract: A liquid crystal display device includes first and second substrates, a liquid crystal layer sandwiched between the first and second substrates, a pixel electrode formed on the first substrate, and a counter electrode formed on the second substrate. A plurality of projected portions are formed on the second substrate in a pixel area. The plurality of projected portions includes a first projected portion and a second projected portion, and the first projected portion is longer than the second projected portion in the pixel area.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: July 6, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Keiichiro Ashizawa, Masahiro Ishii, Masayuki Hikiba
  • Patent number: 7724334
    Abstract: A liquid crystal display device includes a pair of substrates with a liquid crystal layer therebetween with a plurality of scanning signal lines and of video signal lines being formed on a first substrate. The scanning and video signal lines are arranged in a shape of a grid, and a pixel region is defined as a region surrounded by the scanning and video signal lines. A black matrix is formed on a second substrate, is arranged in a position overlapped on the scanning and video signal lines, and has an opening portion in each pixel region. A plurality of first electrodes are provided on the first substrate, and a plurality of second electrodes are provided on the second substrate, wherein at least one of first electrodes and at least one of the second electrodes are arranged in a position overlapped with the opening portion.
    Type: Grant
    Filed: March 12, 2008
    Date of Patent: May 25, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Masuyuki Ohta, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Publication number: 20100103361
    Abstract: A liquid crystal display device includes a first substrate and a second substrate with a liquid crystal material sandwiched therebetween, neighboring first, second, third and fourth regions arranged in a rectangular shape and in a clockwise direction, the first, second, third and fourth regions having a first pixel electrode, a second pixel electrode, a third pixel electrode and a fourth pixel electrode, respectively. The first pixel electrode and the third pixel electrode extend in a parallel direction to one another, and the second pixel electrode and the fourth pixel electrode extend in a parallel direction to one another.
    Type: Application
    Filed: December 30, 2009
    Publication date: April 29, 2010
    Inventors: Masuyuki OHTA, Kazuhiro Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Patent number: 7684005
    Abstract: A liquid crystal display apparatus includes a liquid crystal panel having polarizers, and a back light having a light source for illumination of the liquid crystal panel which has a characteristic of spectral transmittance required to satisfy the following equation, x>y>z, when a medium tone display voltage varies in a range between a minimum and maximum voltage for a Blue pixel, where “x” is a value of the transmittance in the panel at a wavelength corresponding to a longest wavelength in a range of wavelengths designated for blue light, “y” is a value of the transmittance in the panel at a wavelength corresponding to a maximum value of the intensity in a range of wavelengths designated for green light, and “z” is a value of the transmittance in the panel at a wavelength corresponding to a maximum value of the intensity in a range of wavelengths designated for red light.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: March 23, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Yuka Utsumi, Katsumi Kondo, Ikuo Hiyama, Osamu Itoh, Masahito Ohe, Kazuhiko Yanagawa, Keiichiro Ashizawa
  • Patent number: 7643119
    Abstract: A liquid crystal display device includes opposing first and second substrates with a liquid crystal therebetween, and plural spacers formed on second substrate. An uneven portion of a rectangular shape is formed in an area on the first substrate facing an end portion of the respective spacers, and the end portion of the respective spacers and the uneven portion contact mutually, and a long side of the uneven portion is longer than one side of the end portion of the respective spacers, and a short side of the uneven portion is shorter than another side of the end portion of the respective spacers.
    Type: Grant
    Filed: October 3, 2008
    Date of Patent: January 5, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Keiichiro Ashizawa, Masahiro Ishii, Masayuki Hikiba
  • Patent number: 7612853
    Abstract: An active matrix liquid crystal display device includes first and second substrates, a liquid crystal layer disposed between the first and second substrates, and plural image signal lines and scan signal lines formed on the first substrate. Respective pixel regions are formed by adjacent image signal lines and adjacent scan signal lines and have at least an active device, with a first electrode and a second electrode being provided in each pixel region. The first electrode is connected to the active device of one pixel region, and the second electrode of one pixel region is connected to the second electrode of an other pixel region which adjoins the one pixel region in the extended direction of the image signal line. The second electrode is connected for at least three adjacent pixel regions in the extended direction of the image signal line.
    Type: Grant
    Filed: November 2, 2006
    Date of Patent: November 3, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Kazuhiko Yanagawa, Masahiro Yanai, Nobutake Konishi, Nobuyuki Suzuki, Masahiro Ishii, Makoto Yoneya, Sukekazu Aratani
  • Publication number: 20090268148
    Abstract: A liquid crystal display device with a pair of substrates which are arranged to face each other with liquid crystal therebetween, columnar spacers having the substantially equal height formed on a liquid-crystal-side surface of one substrate, and the columnar spacers include the columnar spacer which is contact with a liquid-crystal-side surface of another substrate and the columnar spacer which is not contact with the liquid-crystal-side surface of another substrate.
    Type: Application
    Filed: June 30, 2009
    Publication date: October 29, 2009
    Inventors: Keiichiro ASHIZAWA, Mitsuo NAKATANI, Hiroaki MIWA, Takao TANAKA, Sadafumi HIRAI, Shinichi KAWABE, Makoto Sasaki, Kazuyuki ITO, Masahiro IEDA
  • Publication number: 20090167997
    Abstract: An active matrix liquid crystal display device includes first and second substrates, a liquid crystal layer disposed between the first and second substrates, and plural image signal lines and scan signal lines formed on the first substrate. Respective pixel regions are formed by adjacent image signal lines and adjacent scan signal lines and have at least an active device. A light shield layer is formed between the first substrate and at least one of the image signal lines and is elongated in a direction of extension of the at least one of the image signal lines. The light shield layer and the at least one of the scan signal lines are formed on a same layer on the first substrate.
    Type: Application
    Filed: March 2, 2009
    Publication date: July 2, 2009
    Inventors: Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Kazuhiko Yanagawa, Masahiro Yanai, Nobutake Konishi, Nobuyuki Suzuki, Masahiro Ishii, Makoto Yoneya, Sukekazu Aratani
  • Publication number: 20090147202
    Abstract: A liquid crystal display device includes a first substrate and a second substrate, a liquid crystal between the first substrate and the second substrate, and a plurality of video signal lines, gate signal lines, and counter voltage signal lines formed on the first substrate. A plurality of pixel electrodes, counter electrodes and which are connected to one of the counter voltage signal lines, and thin film transistors are formed on the first substrate. Each of the counter voltage signal lines is extended in parallel to the gate signal line, and a width of a side of the counter voltage signal line which faces the first substrate is wider than a width of a side of the counter voltage signal line which faces the liquid crystal.
    Type: Application
    Filed: November 26, 2008
    Publication date: June 11, 2009
    Inventors: Keiichiro Ashizawa, Masayuki Hikiba, Masuyuki Ohta