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).

  • Active matrix type liquid crystal display apparatus
    Patent number: 7433012
    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, ×>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: Grant
    Filed: December 13, 2005
    Date of Patent: October 7, 2008
    Inventors: Yuka Utsumi, Katsumi Kondo, Ikuo Hiyama, Osamu Itoh, Masahito Ohe, Kazuhiko Yanagawa, Keiichiro Ashizawa
  • Liquid Crystal Display Device
    Publication number: 20080231792
    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 is formed integrally along the entire periphery of a display screen, and one of the light-shielding layer and the organic film layer is formed to be extended beyond an area where the sealing material is formed, and the other of the light-shielding layer and organic film layer is formed inside the area where the sealing material is formed.
    Type: Application
    Filed: May 30, 2008
    Publication date: September 25, 2008
    Inventors: Yoshiaki Nakayoshi, Nagatoshi Kurahashi, Kazuhiko Yanagawa
  • Liquid crystal display device
    Publication number: 20080225223
    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: Application
    Filed: April 15, 2008
    Publication date: September 18, 2008
    Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
  • Liquid crystal display device with two capacitive electrode layers in specific locations
    Patent number: 7423701
    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: August 26, 2005
    Date of Patent: September 9, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiaki Nakayoshi, Kazuhiko Yanagawa
  • Display device having a board for a connector for inputting of video data and a board for mounting a display control circuit and manufacturing method thereof
    Publication number: 20080212011
    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: Application
    Filed: January 23, 2008
    Publication date: September 4, 2008
    Inventors: Yoshihiro IMAJO, Kazuhiko YANAGAWA
  • Display device
    Publication number: 20080192420
    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: Application
    Filed: April 7, 2008
    Publication date: August 14, 2008
    Inventors: Yoshihiro Imajo, Kazuhiko Yanagawa
  • Active-matrix liquid crystal display
    Patent number: 7408609
    Abstract: An active matrix liquid crystal display device includes a pair of substrates and a liquid crystal layer, a video signal lines and scan signal lines delimiting pixel areas having pixel electrodes and display electrodes, reference electrodes and active devices. The display electrodes are arranged on one of the substrates, and the reference electrodes are arranged on another of the substrates. A part of the reference electrodes have a first layer formed in the substrate side and a second layer formed in the liquid crystal layer side. Each of the display electrodes and the reference electrodes has a slit, the slit of the display electrodes and the slit of the reference electrodes being shifted with respect to one another in plan view.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: August 5, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi
  • Liquid crystal display device
    Patent number: 7388643
    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: Grant
    Filed: October 3, 2005
    Date of Patent: June 17, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiaki Nakayoshi, Nagatoshi Kurahashi, Kazuhiko Yanagawa
  • Liquid crystal display device
    Patent number: 7382432
    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: May 22, 2006
    Date of Patent: June 3, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
  • Liquid crystal display device
    Patent number: 7365725
    Abstract: In a liquid crystal display device, drain signal lines which supply the video signal are arranged to cross gate signal lines which supply the scanning signal and counter voltage signal lines which supply the reference signal. The reference signal is supplied to the pixels for every selected pixel row. Further, the counter voltage signal lines in other pixel rows except for the selected pixel rows are respectively configured to assume a floating state.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: April 29, 2008
    Assignee: Hitachi Displays, Ltd.
    Inventors: Yoshiaki Nakayoshi, Yoshihiro Imajo, Kazuhiko Yanagawa
  • Liquid crystal display device
    Publication number: 20080084527
    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: Application
    Filed: November 19, 2007
    Publication date: April 10, 2008
    Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
  • Liquid crystal display device and manufacturing method thereof
    Patent number: 7355667
    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: Grant
    Filed: September 6, 2005
    Date of Patent: April 8, 2008
    Assignee: Hitachi Displays, Ltd.
    Inventor: Kazuhiko Yanagawa
  • Display device
    Patent number: 7352427
    Abstract: A display device which provides reliable connection between a semiconductor device and a printed circuit board includes a display panel, a printed circuit board disposed close to the display panel, and a semiconductor device of a film carrier type which is disposed to lie between the 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: March 10, 2005
    Date of Patent: April 1, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiro Ogawa, Kazuhiko Yanagawa
  • Liquid crystal display device
    Publication number: 20080074604
    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: Application
    Filed: November 7, 2007
    Publication date: March 27, 2008
    Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
  • Liquid crystal display device, display device and manufacturing method thereof
    Publication number: 20080074570
    Abstract: Image display device having an electrode forming layer which includes a plurality of 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 insulted by insulating layer.
    Type: Application
    Filed: October 29, 2007
    Publication date: March 27, 2008
    Inventors: Yoshiaki Nakayoshi, Kazuhiko Yanagawa
  • In-plane field type liquid crystal display device comprising liquid crystal molecules with more than two kinds of reorientation directions
    Patent number: 7345729
    Abstract: A liquid crystal display device includes a pair of substrates with a liquid crystal layer therebetween, a plurality of scanning signal lines and a plurality of video signal lines formed on one of said pair of substrates, a plurality of first electrodes on the one of said pair of substrates and a plurality of second electrodes on the one of said pair of substrates to drive the liquid crystal by a voltage difference with respect to the first electrode. The first electrodes have a bent form, and the second electrodes have a rectangular form.
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: March 18, 2008
    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: 20080024424
    Abstract: A display device includes a display panel, a printed circuit board, and a semiconductor device of a film carrier type which is disposed to lie between the display panel and the printed circuit board and is mounted on a film carrier. Terminals of the film carrier are connected to terminals of the printed circuit board by an anisotropic conductive film. The terminals of the printed circuit board are disposed in at least two rows, with the terminals row being located at a position between adjacent ones of the terminals of the other row. The terminals of the film carrier connected to respective terminals of the printed circuit board are arranged to correspond to an arrangement of the terminals of the printed circuit board.
    Type: Application
    Filed: September 24, 2007
    Publication date: January 31, 2008
    Inventors: Kazuhiro Ogawa, Kazuhiko Yanagawa
  • Active-Matrix Liquid Crystal Display
    Publication number: 20080024711
    Abstract: An active matrix liquid crystal display device includes a pair of substrates and a liquid crystal layer, a video signal lines and scan signal lines delimiting pixel areas having pixel electrodes and display electrodes, reference electrodes and active devices. The display electrodes are arranged on one of the substrates, and the reference electrodes are arranged on another of the substrates. A part of the reference electrodes have a first layer formed in the substrate side and a second layer formed in the liquid crystal layer side. Each of the display electrodes and the reference electrodes has a slit, the slit of the display electrodes and the slit of the reference electrodes being shifted with respect to one another in plan view.
    Type: Application
    Filed: September 24, 2007
    Publication date: January 31, 2008
    Inventors: Kazuhiko Yanagawa, Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi
  • Liquid crystal display device, image display device and manufacturing method thereof
    Patent number: 7307673
    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: April 24, 2006
    Date of Patent: December 11, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiaki Nakayoshi, Kazuhiko Yanagawa
  • Active-matrix liquid crystal display
    Patent number: 7289182
    Abstract: An active matrix liquid crystal display device includes substrates, a liquid crystal layer therebetween, video signal lines and scan signal lines formed on one of the substrates, and pixel electrodes connected to one of the video signal lines through an active device. Pixel areas, which are defined by the video signal lines and the scan signal lines which are formed in the shape of a matrix, have display electrodes, reference electrodes and the active device arranged therein. The display electrodes are arranged on one of the substrates, and the reference electrodes are arranged on another of the substrates, and each of the display electrodes and the reference electrodes has a slit. The slit of the display electrodes and the slit of the reference electrodes are shifted with respect to one another in plan view.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: October 30, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi