Patents by Inventor Yoshiyuki Umeda

Yoshiyuki Umeda 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: 7440064
    Abstract: In a liquid crystal display device, in each unit pixel which is formed as a region surrounded by scanning signal lines and date signal lines includes pixel electrode to which signals of the date signal line is electrically supplied through a thin film transistor and common electrode which are electrically connected with the common signal line, and common signal electrode is arranged to be superposed on the common signal line by way of an insulation layer, and the pixel electrode is electrically connected with a source electrode of the thin film transistor via a through hole which penetrates the insulation layer, and the common electrode is formed such that the common electrode extend in the inside of the unit pixel while covering the common signal line.
    Type: Grant
    Filed: August 22, 2006
    Date of Patent: October 21, 2008
    Assignee: Hitachi Displays, Ltd.
    Inventors: Nagatoshi Kurahashi, Kaori Miyazaki, Masahiro Ishii, Masahiko Suzuki, Yoshiyuki Umeda
  • Publication number: 20060279686
    Abstract: In a liquid crystal display device, in each unit pixel which is formed as a region surrounded by scanning signal lines and date signal lines includes pixel electrode to which signals of the date signal line is electrically supplied through a thin film transistor and common electrode which are electrically connected with the common signal line, and common signal electrode is arranged to be superposed on the common signal line by way of an insulation layer, and the pixel electrode is electrically connected with a source electrode of the thin film transistor via a through hole which penetrates the insulation layer, and the common electrode is formed such that the common electrode extend in the inside of the unit pixel while covering the common signal line.
    Type: Application
    Filed: August 22, 2006
    Publication date: December 14, 2006
    Inventors: Nagatoshi Kurahashi, Kaori Miyazaki, Masahiro Ishii, Masahiko Suzuki, Yoshiyuki Umeda
  • Patent number: 7098982
    Abstract: In a liquid crystal display device, in each unit pixel which is formed as a region surrounded by scanning signal lines and data signal lines, that is a pixel electrode to which signals of the data signal line are electrically supplied through a thin film transistor, and a common electrode is provided, which is electrically connected with a common signal line. The common electrode is arranged so as to be superposed on the common signal line by way of an insulation layer. The pixel electrode is electrically connected with a source electrode of the thin film transistor via a through hole which penetrates the insulation layer, and the common electrode is formed so as to extend in the inside of the unit pixel, while covering the common signal line.
    Type: Grant
    Filed: January 14, 2004
    Date of Patent: August 29, 2006
    Assignee: Hitachi Displays, Ltd.
    Inventors: Nagatoshi Kurahashi, Kaori Miyazaki, Masahiro Ishii, Masahiko Suzuki, Yoshiyuki Umeda
  • Patent number: 6958799
    Abstract: A liquid crystal display includes a pair of substrates having a first substrate and a second substrate, at least one of the first and second substrate being transparent, a liquid crystal layer and a color filter layer both provided between the pair of substrates, a plurality of thin film transistors provided on the first substrate and connected to an image signal wiring and a scanning signal wiring, a common electrode and a pixel electrode connected to the thin film transistors and placed opposite to the common electrode in a pixel region. The common electrode and the pixel electrode are placed in different layers through an interlaminar insulating film in the formed of at least two layers including the color filter layer and an orientation direction of liquid crystal molecules of the liquid crystal layer is controlled by a voltage applied at least through the interlaminar insulating film.
    Type: Grant
    Filed: July 1, 2003
    Date of Patent: October 25, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Tomioka, Yoshiyuki Umeda, Katsumi Kondo
  • Patent number: 6943861
    Abstract: A liquid crystal display device having a pair of substrates, at least one of the substrates being transparent, a liquid crystal layer interposed between the pair of substrates, and pixel electrodes and common electrodes and active elements being arranged on at least one substrate between the pair of substrates. The liquid crystal of the liquid crystal layer is controlled to perform display by applying a voltage between the pixel electrode and the common electrode. An alignment layer is disposed on a surface in contact with the liquid crystal layer of each of the pair of substrates, and the alignment layer is made of an organic polymer selected from the group consisting of polyamic acid group polymers and polyimide ester group polymers having a relative imidization ratio above 60%.
    Type: Grant
    Filed: March 2, 2004
    Date of Patent: September 13, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Tomioka, Kenji Okishiro, Yoshiyuki Umeda, Hitoshi Oaku, Katsumi Kondo
  • Patent number: 6833898
    Abstract: A liquid crystal display apparatus having a pair of substrates and a liquid crystal layer interposed between the pair of substrates. One of the pair of substrates has an electrode structure including a plurality of pixel electrodes and a plurality of common electrodes, an inorganic film is formed on a surface of at least one of the plurality of pixel electrodes and the plurality of common electrodes, an organic polymer film is formed on the inorganic film and the liquid crystal layer is in direct contact with the organic polymer film.
    Type: Grant
    Filed: November 5, 2002
    Date of Patent: December 21, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi
  • Publication number: 20040165132
    Abstract: A liquid crystal display device having a pair of substrates, at least one of the substrates being transparent, a liquid crystal layer interposed between the pair of substrates, and pixel electrodes and common electrodes and active elements being arranged on at least one substrate between the pair of substrates. The liquid crystal of the liquid crystal layer is controlled to perform display by applying a voltage between the pixel electrode and the common electrode. An alignment layer is disposed on a surface in contact with the liquid crystal layer of each of the pair of substrates, and the alignment layer is made of an organic polymer selected from the group consisting of polyamic acid group polymers and polyimide ester group polymers having a relative imidization ratio above 60%.
    Type: Application
    Filed: March 2, 2004
    Publication date: August 26, 2004
    Inventors: Yasushi Tomioka, Kenji Okishiro, Yoshiyuki Umeda, Hitoshi Oaku, Katsumi Kondo
  • Publication number: 20040145695
    Abstract: In a liquid crystal display device, in each unit pixel which is formed as a region surrounded by scanning signal lines and date signal lines includes pixel electrode to which signals of the date signal line is electrically supplied through a thin film transistor and common electrode which are electrically connected with the common signal line, and common signal electrode is arranged to be superposed on the common signal line by way of an insulation layer, and the pixel electrode is electrically connected with a source electrode of the thin film transistor via a through hole which penetrates the insulation layer, and the common electrode is formed such that the common electrode extend in the inside of the unit pixel while covering the common signal line.
    Type: Application
    Filed: January 14, 2004
    Publication date: July 29, 2004
    Inventors: Nagatoshi Kurahashi, Kaori Miyazaki, Masahiro Ishii, Masahiko Suzuki, Yoshiyuki Umeda
  • Patent number: 6704082
    Abstract: A liquid crystal display device has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer interposed between the pair of substrates; and pixel electrodes and common electrodes and active elements arranged on at least one substrate between the pair of substrates, wherein a pair of alignment layers are made of an organic polymer of polyamic acid group of polyamide ester group having a relative imidization ration above 60%; or at least one layer of an insulation film is interposed between the alignment layer in a side of the substrate having the group of electrodes formed thereon, and the pixel electrode and the common electrode disposed under the alignment layer to prevent occurrence of the sticking image and the after image by flattening the electrode portions to moderate the electric field concentration.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: March 9, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Tomioka, Kenji Okishiro, Yoshiyuki Umeda, Hitoshi Oaku, Katsumi Kondo
  • Publication number: 20040012725
    Abstract: A liquid crystal display includes a pair of substrates having a first substrate and a second substrate, at least one of the first and second substrate being transparent, a liquid crystal layer and a color filter layer both provided between the pair of substrates, a plurality of thin film transistors provided on the first substrate and connected to an image signal wiring and a scanning signal wiring, a common electrode and a pixel electrode connected to the thin film transistors and placed opposite to the common electrode in a pixel region. The common electrode and the pixel electrode are placed in different layers through an interlaminar insulating film in the formed of at least two layers including the color filter layer and an orientation direction of liquid crystal molecules of the liquid crystal layer is controlled by a voltage applied at least through the interlaminar insulating film.
    Type: Application
    Filed: July 1, 2003
    Publication date: January 22, 2004
    Inventors: Yasushi Tomioka, Yoshiyuki Umeda, Katsumi Kondo
  • Patent number: 6590627
    Abstract: The present invention provides a liquid crystal display of high image quality which can be driven at a low voltage and shows a lowered inhomogeneity of display caused by an after image phenomenon. The liquid crystal display comprises one pair of substrates which are a first substrate and a second substrate, at least one of which is transparent, a liquid crystal layer and a color filter layer provided between the two substrates, a plurality of thin film transistors provided on the first substrate and connected to an image signal wiring and a scanning signal wiring, a common electrode giving a standard potential, and a pixel electrode connected to the thin film transistors and placed opposite to the common electrode in a pixel region, wherein the common electrode and pixel electrode are placed in different layers from each other through an interlaminar insulating film in the form of layer comprising at least two layers comprising the color filter layer.
    Type: Grant
    Filed: August 15, 2001
    Date of Patent: July 8, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Tomioka, Yoshiyuki Umeda, Katsumi Kondo
  • Publication number: 20030058397
    Abstract: A liquid crystal display apparatus having a pair of substrates and a liquid crystal layer interposed between the pair of substrates. One of the pair of substrates has an electrode structure including a plurality of pixel electrodes and a plurality of common electrodes, an inorganic film is formed on a surface of at least one of the plurality of pixel electrodes and the plurality of common electrodes, an organic polymer film is formed on the inorganic film and the liquid crystal layer is in direct contact with the organic polymer film.
    Type: Application
    Filed: November 5, 2002
    Publication date: March 27, 2003
    Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi
  • Patent number: 6483564
    Abstract: A liquid crystal display apparatus having a pair of substrates and a liquid crystal layer interposed between the pair of substrates. One of the pair of substrates has an electrode structure including a plurality of pixel electrodes and a plurality of common electrodes, an organic polymer film is formed on at least one of the pixel electrodes and the common electrodes, and the liquid crystal layer is in direct contact with the organic polymer film.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: November 19, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi
  • Publication number: 20020140891
    Abstract: The present invention provides a liquid crystal display of high image quality which can be driven at a low voltage and shows a lowered inhomogeneity of display caused by an after image phenomenon.
    Type: Application
    Filed: August 15, 2001
    Publication date: October 3, 2002
    Inventors: Yasushi Tomioka, Yoshiyuki Umeda, Katsumi Kondo
  • Publication number: 20020027632
    Abstract: A liquid crystal display apparatus having a pair of substrates and a liquid crystal layer interposed between the pair of substrates. One of the pair of substrates has an electrode structure including a plurality of pixel electrodes and a plurality of common electrodes, an organic polymer film is formed on at least one of the pixel electrodes and the common electrodes, and the liquid crystal layer is in direct contact with the organic polymer film.
    Type: Application
    Filed: October 24, 2001
    Publication date: March 7, 2002
    Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi
  • Publication number: 20010048498
    Abstract: In a liquid crystal display device of IPS mode, occurrence of a sticking-image and after-image phenomenon is prevented.
    Type: Application
    Filed: February 9, 2001
    Publication date: December 6, 2001
    Inventors: Yasushi Tomioka, Kenji Okishiro, Yoshiyuki Umeda, Hitoshi Oaku, Katsumi Kondo
  • Patent number: 6310676
    Abstract: A liquid crystal display apparatus having a pair of substrates and a liquid crystal layer interposed between the pair of substrates. One of the pair of substrates has an electrode structure including a plurality of pixel electrodes and a plurality of common electrodes, an organic polymer film is formed on at least one of the pixel electrodes and the common electrodes, and the liquid crystal layer is in direct contact with the organic polymer film.
    Type: Grant
    Filed: February 7, 2000
    Date of Patent: October 30, 2001
    Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi
  • Patent number: 6236441
    Abstract: A liquid crystal display apparatus and a method of manufacturing wherein the liquid crystal display apparatus includes a pair of substrates, a liquid crystal layer interposed between the pair of substrates, plural electrodes formed on at least one of the pair of substrates, a passivation layer formed on the plural electrodes and having concave portions, a thin film having low wettability formed on the passivation layer, and an insulating layer formed on the thin film having low wettability. The method includes the steps of irradiating light onto the thin film through a mask, and applying a solution containing organic high polymers so as to form the insulating layer at the concave portions of the passivation layer.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: May 22, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Hiroyuki Kagawa, Hisao Yokokura, Katsumi Kondo, Shigeru Matsuyama, Masahito Oh-e
  • Patent number: 6222602
    Abstract: A liquid crystal display having a wide viewing angle, a large contrast ratio, and little nonuniformity of display, is formed by a pair of substrates, and a liquid crystal layer interposed between the pair of substrates, wherein at least one of the pair of substrates has plural electrodes, a passivation layer formed on the plural electrodes, and an insulating layer formed at concave portions of the passivation layer for making the thickness of the liquid crystal layer uniform.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: April 24, 2001
    Assignee: Hitachi, Ltd
    Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Hiroyuki Kagawa, Hisao Yokokura, Katsumi Kondo, Shigeru Matsuyama, Masahito Oh-e
  • Patent number: 6130737
    Abstract: A liquid crystal display apparatus has a pair of substrates and a liquid crystal layer interposed between the pair of substrates, one of the pair of substrates having an electrode structure composed of a plurality of electrodes for generating an electric field having a dominant component parallel to the substrate in the liquid crystal layer, a protective film formed on the electrode structure, and an alignment film formed on the protective film, and the thickness of the protective film is greater than the thickness of the electrode in contact with the protective film by more than 0.4 .mu.m.
    Type: Grant
    Filed: January 8, 1998
    Date of Patent: October 10, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi