Patents by Inventor Hitoshi Ooaku

Hitoshi Ooaku 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 wherein driving frequency is 200 or less and 50% threshold voltage is 1.5 V or less
    Patent number: 5781263
    Abstract: A liquid crystal display device permitting low voltage driving which presents good display quality for a long time and excellent characteristics in low power consumption when voltage is supplied at a high temperature of about 50.degree. C. under a driving condition of a low frequency of 200 or less in terms of the number of polarity inversion per second. The display device includes a liquid crystal composition in which the voltage corresponding to 50% threshold value is 1.5 V or less is selected, and a fluorine-containing polymer material such as a fluorine-containing polyimide is used.
    Type: Grant
    Filed: March 13, 1997
    Date of Patent: July 14, 1998
    Assignee: Optrex Corporation
    Inventors: Jun Kawagoe, Satoru Ihara, Hitoshi Ooaku