Patents by Inventor Kazuhiko Yanagawa

Kazuhiko Yanagawa 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).

  • In-plane field type liquid crystal display device comprising liquid crystal molecules with more than two kinds of reorientation directions
    Patent number: 7046324
    Abstract: An active matrix liquid crystal display device having a pair of substrates, a liquid crystal layer, scanning lines and video signal lines provided in a matrix manner, at least one pixel electrode and at least one common electrode. The at least one pixel electrode is bent so as to be inclined in first and second directions which are symmetrical relative to the alignment direction of the liquid crystal. The first direction of the pixel electrode is at a plus predetermined angle relative to the alignment direction, while the second direction of the pixel electrode is at a minus predetermined angle relative to the alignment direction.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: May 16, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Masuyuki Ohta, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Liquid crystal display device
    Publication number: 20060098148
    Abstract: A liquid crystal display device includes a first substrate and a second substrate which are arranged to face each other in an opposed manner by way of a liquid crystal, first electrodes which are formed in a pixel region of a liquid-crystal-side surface of a liquid crystal display part of the first substrate, and second electrodes which are formed in a pixel region of a liquid-crystal-side surface of a liquid crystal display part of the second substrate. The liquid crystal display device further includes an arrangement which, with respect to a voltage applied between the first electrodes and the second electrodes formed per one or a plurality of frames, sequentially applies the voltage which is equal to or less than 20% of the maximum voltage between the first and second electrodes of respective pixel regions.
    Type: Application
    Filed: December 28, 2005
    Publication date: May 11, 2006
    Inventors: Setsuo Kobayashi, Kazuhiko Yanagawa
  • Active matrix type liquid crystal display apparatus
    Publication number: 20060087482
    Abstract: A liquid crystal display apparatus includes a liquid crystal panel including a pair of polarizers, and a back light provided at a back side of said liquid crystal panel. The liquid crystal panel is an active matrix type liquid crystal panel enabling display and has a characteristic of spectral transmittance required to satisfy the following equation, x>y, when a drive voltage is applied thereto so as to vary from a dark state to a light state, in which “x” is a value of the transmittance in the liquid crystal panel at a wavelength which corresponds to one of 490 nm and 500 nm, and “y” is a value of the transmittance in the liquid crystal panel at a wavelength which corresponds to 545 nm.
    Type: Application
    Filed: December 13, 2005
    Publication date: April 27, 2006
    Inventors: Yuka Utsumi, Katsumi Kondo, Ikuo Hiyama, Osamu Itoh, Masahito Ohe, Kazuhiko Yanagawa, Keiichiro Ashizawa
  • Liquid crystal display with gate lines and an edge of the black matrix elongated parallel to an initial orientation direction
    Patent number: 7030953
    Abstract: The present invention is to provide the multi-domain system IPS (In-Plane Switching mode) liquid crystal display which has high contrast and does not have an improper image display. According to an aspect of the present invention, there is provided a black matrix formed between a pair of substrates and formed over a plurality of drain lines and gate lines, a plurality of spaces arranged under the black matrix, wherein a plurality of liquid crystal molecules lined to a boundary direction of the black matrix in “OFF” state, and having a first group and a second group in “ON” state, wherein a switching angle of the second group is opposite to a switching angle of the first group.
    Type: Grant
    Filed: September 11, 2003
    Date of Patent: April 18, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Keiichiro Ashizawa, Masahiro Ishii, Masayuki Hikiba
  • Liquid crystal display device
    Patent number: 7030941
    Abstract: A liquid crystal display device includes a first substrate and a second substrate, which are arranged to face each other in an opposed manner by way of liquid crystal material, first electrodes which are formed in a pixel region of a liquid-crystal-side surface of the first substrate, and second electrodes which are formed in a pixel region of a liquid-crystal-side surface of the second substrate. In such a liquid crystal display device, liquid crystal molecules are arranged in the vertical direction with respect to the substrates in a state in which an electric field is not applied between the first electrodes and the second electrodes. The liquid crystal display device, with respect to a voltage applied between the first electrodes and the second electrodes, intermittently applies a voltage which is equal to or less than 20% of the maximum voltage.
    Type: Grant
    Filed: May 15, 2003
    Date of Patent: April 18, 2006
    Assignee: Hitachi Displays, Ltd.
    Inventors: Setsuo Kobayashi, Kazuhiko Yanagawa
  • Liquid crystal display device
    Publication number: 20060066780
    Abstract: A pair of electrodes which constitute an upper layer and a lower layer with respect to an interlayer insulation film are formed as different layers at respective pixel regions on a liquid-crystal-side surface of one substrate out of respective substrates which are arranged to face each other in an opposed manner by way of liquid crystal. At two pixel regions which are selected from the respective pixel regions, the height of background layers on which the electrodes which constitute the lower layers with respect to the interlayer insulation films are formed differs with respect to a surface of one substrate. The film thickness of the interlayer insulation film is set small with respect to the high background layer out of respective background layers which differ in height and is set large with respect to the low background layer out of respective background layers which differ in height.
    Type: Application
    Filed: November 21, 2005
    Publication date: March 30, 2006
    Inventors: Takahiro Ochiai, Kikuo Ono, Ryutaro Oke, Kazuhiko Yanagawa
  • Color display device
    Patent number: 7015992
    Abstract: A color display device including a pair of substrates having a display portion and a peripheral portion. Gate signal lines and drain signal lines are formed on one substrate of the pair of substrates with a protective film being formed on the gate signal lines, the drain signal lines, and the one substrate including at least one of the peripheral portion and the display portion thereof. Color filters are formed on the other substrate and spacers are formed on the one substrate including the peripheral portion. At least two of the color filters are laminated in the peripheral portion, and a thickness of the protective film in the display portion is greater than a thickness of the protective film at a position of one of the spacers arranged in the peripheral portion.
    Type: Grant
    Filed: May 4, 2004
    Date of Patent: March 21, 2006
    Assignee: HItachi, Ltd.
    Inventors: Yoshiaki Nakayoshi, Kazuhiko Yanagawa
  • Method of measuring AC residual image in a liquid crystal display device
    Patent number: 7012668
    Abstract: A pair of substrates and a liquid crystal layer held between the pair of substrates are provided, at least one of the pair of substrates has plural electrodes for applying an electric field approximately parallel to the substrate to the liquid crystal layer, a protecting film for protecting at least one of the plural electrodes and oriented films or the electrodes, and an AC residual image of the oriented film is less than 8% to thereby enable high quality image display upon eliminating display defects caused by the AC residual image.
    Type: Grant
    Filed: May 16, 2005
    Date of Patent: March 14, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Setsuo Kobayashi, Kazuhiko Yanagawa
  • Liquid crystal display device, illumination device backlight unit
    Publication number: 20060043406
    Abstract: A liquid crystal display device with a liquid crystal display panel and a backlight, the backlight is formed by stacking a lower electrode, a light emitting layer and an upper layer on one surface of a substrate, one of the lower electrode and the upper electrode have planer pattern, another of the lower electrode and the upper electrode have plurality of large regions and plurality of small regions which connect neighboring two of the plurality of large regions, and width of the small regions is narrower than that of the large regions.
    Type: Application
    Filed: September 2, 2005
    Publication date: March 2, 2006
    Inventors: Masaki Tsubokura, Kazuhiko Yanagawa
  • Liquid crystal display device
    Publication number: 20060028609
    Abstract: A liquid crystal display device has a pair of substrates disposed in opposition to one another with a liquid crystal interposed therebetween, active elements formed on one of the pair of substrates, an organic film layer formed to cover the active elements, a light-shielding film formed on another of the pair of substrates, and a sealing material which sticks the pair of substrates together. In the liquid crystal display device, the sealing material has an injecting port formed therein and sealed with an end-sealing material and spaced apart, and the light-shielding layer and the organic film layer are formed to be extended outward from the sealing material, and the organic film layer is at least partly removed at the injecting port.
    Type: Application
    Filed: October 3, 2005
    Publication date: February 9, 2006
    Inventors: Yoshiaki Nakayoshi, Nagatoshi Kurahashi, Kazuhiko Yanagawa
  • Liquid crystal display device
    Patent number: 6995818
    Abstract: A pair of electrodes which constitute an upper layer and a lower layer with respect to an interlayer insulation film are formed as different layers at respective pixel regions on a liquid-crystal-side surface of one substrate out of respective substrates which are arranged to face each other in an opposed manner by way of liquid crystal. At two pixel regions which are selected from the respective pixel regions, the height of background layers on which the electrodes which constitute the lower layers with respect to the interlayer insulation films are formed differs with respect to a surface of one substrate. The film thickness of the interlayer insulation film is set small with respect to the high background layer out of respective background layers which differ in height and is set large with respect to the low background layer out of respective background layers which differ in height.
    Type: Grant
    Filed: June 9, 2004
    Date of Patent: February 7, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Ochiai, Kikuo Ono, Ryutaro Oke, Kazuhiko Yanagawa
  • Lateral electric-field liquid crystal display device suitable for improvement of aperture ratio
    Publication number: 20060023152
    Abstract: A liquid crystal display device includes a backlight case, a light guide disposed in the backlight case, a light source disposed in the backlight case and arranged at one side of the light guide, and a liquid crystal panel formed over the backlight case. An outer edge of the backlight case is straight in plane view at one side which extends in a direction perpendicular to an elongated direction of the light source, and a width of a top surface of the backlight case at the one side is wider at a position adjacent to the light guide than a width thereof at a position adjacent to the light source arranged.
    Type: Application
    Filed: September 30, 2005
    Publication date: February 2, 2006
    Inventors: Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Kazuhiko Yanagawa, Masahiro Yanai, Nobutake Konishi, Nobuyuki Suzuki, Masahiro Ishii, Makoto Yoneya, Sukekazu Aratani
  • Display device including a distribution circuit disposed after a video signal generation circuit
    Patent number: 6985130
    Abstract: In an image display device including a distribution circuit disposed after a video signal generation circuit, mutually adjacent outputs from the video signal generation circuit are made opposite to each other in polarity, and at least one of R, G and B colors assigned to one unit pixel each including three mutually adjacent R, G and B pixels is connected to the video signal generation circuit different from the video signal generation circuit to which the other ones of the R, G and B colors are connected.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: January 10, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiaki Nakayoshi, Kazuhiko Yanagawa
  • Liquid crystal display device and manufacturing method thereof
    Publication number: 20050286006
    Abstract: A liquid crystal display device include a pair of substrates with liquid crystal material therebetween, a plurality of first spacers formed on one of the pair of substrates, and a second spacer formed on the one of the pair of substrates and arranged to surround the plurality of first spacers in plan view. The first spacer and the second spacer and are made of resin and are not made from the liquid crystal material. Further, a distance from the one of the pair of substrates to a top surface of the first spacers is smaller than a distance from the one of the pair of substrates to a top surface of the second spacer.
    Type: Application
    Filed: September 6, 2005
    Publication date: December 29, 2005
    Inventor: Kazuhiko Yanagawa
  • Liquid crystal display device, image display device and manufacturing method thereof
    Publication number: 20050280747
    Abstract: Image display device having an electrode forming layer which includes a plurality of gate lines, a plurality of drain lines, a plurality of switching elements and the a plurality of pixel electrodes, and having reference electrode layer between the electrode forming layer and a substrate where the electrode forming layer formed thereon, and the reference electrode layer and the electrode forming layer are insulated by insulating layer.
    Type: Application
    Filed: August 26, 2005
    Publication date: December 22, 2005
    Inventors: Yoshiaki Nakayoshi, Kazuhiko Yanagawa
  • Lateral electric-field liquid crystal display device suitable for improvement of aperture ratio
    Patent number: 6975374
    Abstract: A liquid crystal display device includes a pair of substrates with a liquid crystal layer therebetween, and a plurality of scan signal lines and a plurality of image signal lines formed on one of the pair of substrates cross each other in a matrix form. A pair of counter electrodes are arranged on both sides of the plurality of image signal lines, and a shielding layer is provided on the one of the pair of substrates and arranged between one of the a pair of counter electrodes and one of the plurality of image signal lines in plan view. A layer of the shielding layer is different from a layer of the pair of counter electrodes and a layer of the one of the plurality of image signal lines.
    Type: Grant
    Filed: August 16, 2002
    Date of Patent: December 13, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Kazuhiko Yanagawa, Masahiro Yanai, Nobutake Konishi, Nobuyuki Suzuki, Masahiro Ishii, Makoto Yoneya, Sukekazu Aratani
  • Liquid crystal display device, display device and manufacturing method thereof
    Patent number: 6970222
    Abstract: Image display device having an electrode forming layer which includes a plurality of gate lines, a plurality of drain lines, a plurality of switching elements and the a plurality of pixel electrodes, and having reference electrode layer between the electrode forming layer and a substrate where the electrode forming layer formed thereon, and the reference electrode layer and the electrode forming layer are insulated by insulating layer.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: November 29, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiaki Nakayoshi, Kazuhiko Yanagawa
  • Display device
    Patent number: 6961110
    Abstract: A liquid crystal display device which provides reliable connection between a semiconductor device and a printed circuit board includes a liquid crystal display panel, a printed circuit board disposed close to the liquid crystal display panel, and a semiconductor device of a film carrier type which is disposed to lie between the liquid crystal display panel and the printed circuit board, and terminals of the semiconductor device are respectively connected by an anisotropic conductive film to terminals of the printed circuit board that are disposed in opposition to the respective terminals of the semiconductor device.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: November 1, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiro Ogawa, Kazuhiko Yanagawa
  • Liquid crystal display device and manufacturing method thereof
    Patent number: 6956636
    Abstract: A seal material for isolating a liquid crystal material from the outside is provided between substrates disposed opposite to each other with the liquid crystal material interposed therebetween. The seal material is formed as an annular pattern having no portion that contacts the liquid crystal material. There is a first rib-like supporting strut for preventing contact between the liquid crystal and the seal material and a second rib-like supporting strut that is positioned with respect to the first rib-like supporting strut to form a passage into which the liquid crystal material flows from an opening formed in the first rib-like supporting strut, which opening serves as an exit, the supporting struts being formed inside the seal material and between the substrates.
    Type: Grant
    Filed: August 8, 2003
    Date of Patent: October 18, 2005
    Assignee: Hitachi Displays, Ltd.
    Inventor: Kazuhiko Yanagawa
  • Active-matrix liquid crystal display
    Publication number: 20050225692
    Abstract: An active matrix liquid crystal display device having a pair of substrates with liquid crystal layer therebetween, a plurality of video signal lines and a plurality of scan lines formed on one of the pair of substrates and a plurality of pixel electrodes connected to the video signal line through an active device and a plurality of color filters formed on another of the pair of substrates. A shield electrode which overlaps with one of the video signal lines in plane view is arranged between the one of the video signal lines and one of the color filters, and a planarization layer is arranged between one of the pixel electrodes and the shield electrode.
    Type: Application
    Filed: June 6, 2005
    Publication date: October 13, 2005
    Inventors: Kazuhiko Yanagawa, Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi