Patents by Inventor Kazuyoshi Hirayama

Kazuyoshi Hirayama 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: 4494824
    Abstract: A liquid crystal display device comprises a pair of opposed substrates, a transparent electrode on at least one of the substrates, a liquid crystal composition, a characteristic orienting film comprising an organic high copolymer resin film formed at least over the surface of the electrode, and which shows an excellent orientation, and conductive particles mixed within the orienting film to reduce the resistance of the orienting film.
    Type: Grant
    Filed: December 17, 1982
    Date of Patent: January 22, 1985
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takeshi Nakamura, Seiji Okamoto, Kazuyoshi Hirayama
  • Patent number: 4190329
    Abstract: A liquid crystal display cell of the reflection type comprises a substrate on which reflection electrodes are formed, a transparent substrate on which transparent electrodes are formed and a liquid crystal composition filled between said two substrates. Activating voltage signals are applied between said two electrodes, thereby to drive the liquid crystal display cell to display desired symbols. A reflection film is formed on at least one of said two substrates in such a manner that the reflection film is electrically isolated from said reflection electrodes and the reflection film covers a position where the symbols are never displayed, or the reflection electrodes are not formed. The visibility of the information displayed on the liquid crystal cell can be enhanced because the reflection electrodes and the reflection film, in combination, cover the display panel uniformly.
    Type: Grant
    Filed: February 22, 1978
    Date of Patent: February 26, 1980
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Isamu Washizuka, Satoshi Teramura, Shinji Tsugei, Kazuyoshi Hirayama