Patents by Inventor Haruhisa Ootsuka

Haruhisa Ootsuka 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).

  • Liquid crystal display device
    Patent number: 6839100
    Abstract: For preventing a luminance drop of a liquid crystal display panel comprising a liquid crystal display panel, a driver circuit of driving the liquid crystal panel, and a luminance having a fluorescent lamp as one of elements thereof, the present invention provides a heat retaining means for an electrode portion of the fluorescent lamp, and suppresses heat radiation at the electrode portion of the fluorescent lamp so as to secure sufficient amount of mercuric vapor in the whole of the fluorescent lamp.
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: January 4, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Ken Saito, Haruhisa Ootsuka
  • Liquid crystal display device
    Publication number: 20040155994
    Abstract: For preventing a luminance drop of a liquid crystal display panel incorporating a liquid crystal display panel, a driver circuit for driving the liquid crystal panel, and a luminaire having a fluorescent lamp as one of elements thereof, the present invention provides a heat retaining element for an electrode portion of the fluorescent lamp, and suppresses heat radiation at the electrode portion of the fluorescent lamp so as to secure a sufficient amount of mercuric vapor in the whole of the fluorescent lamp.
    Type: Application
    Filed: February 9, 2004
    Publication date: August 12, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Ken Saito, Haruhisa Ootsuka
  • LCD having low-thermal-conductivity lamp holder for retain heat in fluorescent lamp
    Patent number: 6441874
    Abstract: For preventing a luminance drop of a liquid crystal display panel comprising a liquid crystal display panel, a driver circuit of driving the liquid crystal panel, and a luminaire having a fluorescent lamp as one of elements thereof, the present invention provides a heat retaining means for an electrode portion of the fluorescent lamp, and suppresses heat radiation at the electrode portion of the fluorescent lamp so as to secure sufficient amount of mercuric vapor in the whole of the fluorescent lamp.
    Type: Grant
    Filed: January 21, 2000
    Date of Patent: August 27, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Ken Saito, Haruhisa Ootsuka