Patents by Inventor Masaaki Tagushi

Masaaki Tagushi 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).

  • Ferroelectric liquid crystal display device having an A.C. holding voltage
    Patent number: 4715688
    Abstract: A liquid crystal display device utilizing a ferroelectric liquid crystal, e.g., a chiral smectic liquid crystal aligned to establish two bi-stable display states. The display device is driven in a time-sharing mode. The change of the bi-stable display states is effected by applying a selected voltage to the changed ferro-electric liquid crystal. Thereafter the display state is held by applying an A.C. pulse voltage.
    Type: Grant
    Filed: December 10, 1984
    Date of Patent: December 29, 1987
    Assignee: Seiko Instruments Inc.
    Inventors: Takamasa Harada, Masaaki Tagushi, Koji Iwasa