Patents by Inventor Ryuji Sawata

Ryuji Sawata 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: 5558927
    Abstract: A color filter for a liquid crystal display which comprises an optically transparent supporting member (100), a transparent conductive layer (500) formed upon said supporting member (100), and a color layer (200) in which are disposed in specified patterns red, blue and green picture elements formed upon said transparent conductive layer (500), wherein the color layer (200) employs pigments as coloring agents which form said picture elements, the relative dielectric constant of the color layer (200) is at least 2.0 under measurement conditions of the application thereto of an alternating current of 5 V and a frequency of 1 kHz to 100 kHz, and moreover, the red, blue and green picture elements of which the color layer is composed have relative dielectric constant of within a range of .+-.25% of the mean value for the relative dielectric constant of said color layer. The color layer (200) is 0.4 .mu.m to 1.0 .mu.m thick.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: September 24, 1996
    Assignee: Seiko Epson Corporation
    Inventors: Hisashi Aruga, Keiji Takizawa, Ryuji Sawata, Takashi Kobayashi