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).

  • Patent number: 7586578
    Abstract: A display device includes a terminal portion on a substrate thereof. The terminal portion includes a first transparent conductive layer, an insulation film which has an opening exposing a portion of the first transparent conductive layer, and a second transparent conductive layer which is formed in a state such that the second transparent conductive layer covers the first transparent conductive layer which is exposed from the insulation film and the opening of the insulation film. The first transparent conductive layer is connected with a signal line which extends to the terminal portion from below the signal line.
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: September 8, 2009
    Assignee: Hitachi Displays, Ltd.
    Inventors: Toshiki Kaneko, Kazuhiko Yanagawa
  • Publication number: 20090207351
    Abstract: The present invention provides a liquid crystal display device which exhibits the excellent wide viewing angle characteristic and the high-speed responsiveness. A pixel region includes a switching element which is operated in response to a scanning signal from a gate signal line, a pixel electrode to which a video signal from a drain signal line is supplied through a switching element, and a counter electrode which generates an electric field between the counter electrode and the pixel electrode. The pixel region is constituted of divided respective regions.
    Type: Application
    Filed: April 22, 2009
    Publication date: August 20, 2009
    Inventors: Yoshiaki Nakayoshi, Kazuhiko Yanagawa, Takahiro Ochiai, Hirotaka Imayama
  • Patent number: 7561241
    Abstract: In a display device forming a board for mounting a connector which allows inputting of video data thereon and a board for mounting a display control circuit to be connected to the connector thereon on a surface of a display module opposite to an observation side, the board for mounting the connector thereon and the board for mounting the display control circuit thereon are physically separated from each other and, further, an area of the board for mounting the display control circuit thereon is set smaller than an area of the board for mounting the connector thereon.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: July 14, 2009
    Assignee: Hitachi Displays, Ltd.
    Inventors: Yoshihiro Imajo, Kazuhiko Yanagawa
  • 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
  • Patent number: 7551169
    Abstract: A liquid crystal display device can suppress the local temperature elevation of a liquid crystal in the vicinity of drivers. On a liquid-crystal-side surface of one substrate out of substrates which are arranged to face each other in an opposed manner while sandwiching a liquid crystal therebetween, a switching element which is operated in response to scanning signals from a gate signal line, a pixel electrode to which video signals from a drain signal line are supplied via the switching element, and a reference electrode which generates an electric field between the reference electrode and the pixel electrode are mounted on each pixel region of the liquid-crystal-side surface. The video signals from the drain signal line are generated by a driver chip mounted on one substrate. A light transmittivity of the liquid crystal layer is set to take a minimum value when a voltage is not applied between the pixel electrode and the reference electrode.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: June 23, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Setsuo Kobayashi, Katsumi Kondo, Nagatoshi Kurahashi
  • Patent number: 7542121
    Abstract: There is provided a liquid crystal display device in which light leaks near spacers are prevented. The liquid crystal display device controls the optical transmissivity of a liquid crystal layer interposed between substrates disposed in opposition to each other, by means of an electric field generated in the layer-thickness direction of the liquid crystal layer, includes spacers formed on a liquid-crystal-side surface of one of the substrates, signal lines formed on a liquid-crystal-side surface of the other substrate, an insulating film formed to cover the signal lines, and electrodes formed on the upper surface of the insulating film, each of which serves as one electrode contributing to control of the optical transmissivity of the liquid crystal layer.
    Type: Grant
    Filed: November 7, 2007
    Date of Patent: June 2, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
  • Publication number: 20090128766
    Abstract: A display device includes a substrate having display portion and peripheral portion, a plurality of gate signal lines and a plurality of drain signal lines formed over the substrate, a plurality of switching elements connected to the plurality of gate signal lines and the plurality of drain signal lines and formed over the substrate, and a plurality of pixel electrodes connected to the plurality of switching elements and formed in the display portion. An organic interlayer film is formed in the display portion and the peripheral portion, and a covering layer is formed on the organic interlayer film in the peripheral portion and the insulating film includes at least one of a plurality of recesses and protuberances.
    Type: Application
    Filed: December 10, 2008
    Publication date: May 21, 2009
    Inventors: Tetsuya Kawamura, Kazuhiko Yanagawa, Nagatoshi Kurahashi, Tsuyoshi Uchida
  • Publication number: 20090122249
    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: Application
    Filed: October 14, 2008
    Publication date: May 14, 2009
    Inventors: Kazuhiko Yanagawa, Keiichiro Ashizawa, Masahiro Ishii, Masayuki Hikiba
  • Publication number: 20090091687
    Abstract: A liquid crystal display device includes at least a liquid crystal display panel, which uses a pair of transparent substrates which are arranged to face each other with liquid crystal disposed therebetween as an envelope, and a light guide plate, which guides light from a light source, being sequentially arranged from a viewer side. The liquid crystal display panel forms light reflection layers on a liquid-crystal-side surface of the light-guide-plate side transparent substrate using portions of respective pixels and forms color filters which face the light reflection layers on the liquid-crystal-side surface of one transparent substrate or a liquid-crystal-side surface of the other transparent substrate which faces the one transparent substrate. Light from the light source is irradiated such that respective colors thereof, which constitute three primary colors, are sequentially changed over.
    Type: Application
    Filed: July 19, 2007
    Publication date: April 9, 2009
    Inventors: Yoshiaki NAKAYOSHI, Kazuhiko YANAGAWA
  • Publication number: 20090079888
    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: November 25, 2008
    Publication date: March 26, 2009
    Inventors: Yoshiaki Nakayoshi, Kazuhiko Yanagawa
  • Publication number: 20090051864
    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: Application
    Filed: October 3, 2008
    Publication date: February 26, 2009
    Inventors: Kazuhiko Yanagawa, Keiichiro Ashizawa, Masahiro Ishii, Masayuki Hikiba
  • Patent number: 7492577
    Abstract: A display device includes a fixed first display element and a movable second display element, the first display element and the second display element assume a first state in which the first display element and the second display element are arranged individually and a second state in which the first display element and the second display element are arranged individually in an overlapped manner.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: February 17, 2009
    Assignee: Hitachi Displays, Ltd.
    Inventors: Yoshiteru Tomizuka, Yasunari Kochi, Kazuhiko Yanagawa, Nobutaka Jin
  • Patent number: 7492433
    Abstract: In a display device forming a board for mounting a connector which allows inputting of video data thereon and a board for mounting a display control circuit to be connected to the connector thereon on a surface of a display module opposite to an observation side, the board for mounting the connector thereon and the board for mounting the display control circuit thereon are physically separated from each other and, further, an area of the board for mounting the display control circuit thereon is set smaller than an area of the board for mounting the connector thereon.
    Type: Grant
    Filed: February 23, 2004
    Date of Patent: February 17, 2009
    Assignee: Hitachi Displays, Ltd.
    Inventors: Yoshihiro Imajo, Kazuhiko Yanagawa
  • Publication number: 20090040438
    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: Application
    Filed: October 2, 2008
    Publication date: February 12, 2009
    Inventors: Yuka Utsumi, Katsumi Kondo, Ikuo Hiyama, Osamu Itoh, Masahito Ohe, Kazuhiko Yanagawa, Keiichiro Ashizawa
  • Publication number: 20090022314
    Abstract: In a personal information access system 1, a bar-code information output 106 of an information processing device 10 makes bar-code information by associating personal information with term information defining a valid period of the personal information, a password, and terminal-identification information unique to an access terminal 20 permitted to gain access, and the bar-code information is printed on a paper medium M. The access terminal 20 displays only the personal information permitted to output by an output controller 204, on a display part 205. When the personal information is bar-coded with the valid period being set, in addition to encryption, the security level of personal information is synergistically enhanced and it is feasible to ensure prevention of leakage of personal information to third parties.
    Type: Application
    Filed: February 9, 2006
    Publication date: January 22, 2009
    Applicant: NTT DoCoMo , Inc.
    Inventors: Teruyuki Wada, Kazuhiko Yanagawa, Takeharu Ozawa, Daisuke Kato
  • Publication number: 20080303998
    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: Application
    Filed: March 12, 2008
    Publication date: December 11, 2008
    Inventors: Masuyuki OHTA, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Publication number: 20080297714
    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: Application
    Filed: August 4, 2008
    Publication date: December 4, 2008
    Inventors: Kazuhiko Yanagawa, Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi
  • Patent number: 7453540
    Abstract: A display device includes an insulated substrate, a thin film transistor formed over the insulated substrate, and first and second electrodes formed over the insulated substrate. A first insulating layer is formed over the insulated substrate, the first electrode, and the second electrode, and third and fourth electrodes are formed over the first insulating layer. A second insulating layer is formed over the first insulating layer, the third electrode, and the fourth electrode, and a fifth electrode formed over the second insulating layer, and a contact hole is formed in the first insulating layer and the second insulating layer. The fifth electrode is connected to the second electrode via the fourth electrode in the contact hole.
    Type: Grant
    Filed: July 20, 2006
    Date of Patent: November 18, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiaki Nakayoshi, Kazuhiko Yanagawa
  • Patent number: 7453541
    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: May 2, 2007
    Date of Patent: November 18, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Keiichiro Ashizawa, Masahiro Ishii, Masayuki Hikiba
  • Patent number: 7446824
    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: Grant
    Filed: December 28, 2005
    Date of Patent: November 4, 2008
    Assignee: Hitachi Displays, Ltd.
    Inventors: Setsuo Kobayashi, Kazuhiko Yanagawa