Patents by Inventor Yoko Katsuya

Yoko Katsuya 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: 7038740
    Abstract: There is provided a liquid crystal display device that can obtain a high light utilization efficiency and a sufficient supplementary capacitance without reducing an aperture rate of pixels and is able to attain higher resolution. A silicon nitride film 22 that serves as a supplementary capacitance use transparent insulating film is formed under a pixel electrode 3. A common electrode 21 that is made of ITO and is connected to a potential common to an opposite electrode is formed under the silicon nitride film 22. The pixel electrode 3, the silicon nitride film 22 and the common electrode 21 constitute the supplementary capacitance, and the pixel electrode 3, the silicon nitride film 22 and the common electrode 21 are each made to have a film thickness such that a transmittance is increased by interference at a specified wavelength.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: May 2, 2006
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Yoko Katsuya
  • Patent number: 6507381
    Abstract: A liquid crystal layer, made of a liquid crystal material having a negative dielectric anisotropy, is sealed between an opposing substrate and a pixel substrate that are arranged face to face with each other; thus, a liquid crystal panel of the birefringence control type is constructed. In this liquid crystal panel, the liquid crystal molecules, provided as the liquid crystal material, are kept in an oriented state in which they incline by an angle in the range of 3° to 10° with respect to the direction that is normal to the opposing substrate and the pixel substrate. Upon application of a driving voltage to the liquid crystal layer, since the pretilt angle, which is the initial angle of inclination of the liquid crystal molecules, is set at a value greater than that of a conventional apparatus, the occurrence of reverse tilt regions can be suppressed.
    Type: Grant
    Filed: May 15, 1998
    Date of Patent: January 14, 2003
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoko Katsuya, Shinji Shimada, Kiyoshi Ogishima, Yutaka Takafuji
  • Patent number: 6081310
    Abstract: A reflection-type liquid crystal display device includes a first substrate including a plurality of pixel electrodes arranged in a matrix and switching devices for driving the pixel electrodes. A second substrate includes a counter electrode, and a liquid crystal layer is interposed between the first substrate and the second substrate. The pixel electrodes each include a lower electrode layer and an upper electrode layer. The upper electrode layer is formed of either silver or a silver alloy and is reflective.
    Type: Grant
    Filed: November 4, 1998
    Date of Patent: June 27, 2000
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoko Katsuya, Yutaka Takafuji, Atsushi Iwakiri, Tomoko Fujii
  • Patent number: 6013310
    Abstract: A thin film semiconductor device including an insulating substrate; and a structure provided on the insulating substrate and including a silicon layer containing hydrogen diffused therein and a silicon nitride layer. The insulating substrate is formed of an insulating material having a thermal expansion coefficient of 2.6.times.10.sup.-6 deg.sup.-1 or more or having a distortion point of 850.degree. C. or lower.
    Type: Grant
    Filed: September 24, 1997
    Date of Patent: January 11, 2000
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshihumi Yaoi, Yoko Katsuya, Shuhei Tsuchimoto
  • Patent number: 5707746
    Abstract: A thin film semiconductor device including an insulating substrate; and a structure provided on the insulating substrate and including a silicon layer containing hydrogen diffused therein and a silicon nitride layer. The insulating substrate is formed of an insulating material having a thermal expansion coefficient of 2.6.times.10.sup.-6 deg.sup.-1 or more or having a distortion point of 850.degree. C. or lower.
    Type: Grant
    Filed: September 21, 1993
    Date of Patent: January 13, 1998
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshihumi Yaoi, Yoko Katsuya, Shuhei Tsuchimoto