Patents by Inventor Tadashi Tamukai

Tadashi Tamukai 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).

  • TFT array inspection method and device
    Patent number: 6262589
    Abstract: The pixel capacitances of an LCD array can be inspected easily and in a short time without being affected by the capacitance of the tester system. On the first occasion, pixel capacitance CP is charged with pixel voltage VP and line capacitance CS (CS>>CP) that is connected in parallel with pixel capacitance CP is charged with set voltage VS (VP≠VS). By connecting pixel capacitance CP and line capacitance CS is parallel, the difference voltage &Dgr;VS1 of the voltage of the line capacitance CS after the parallel connection and the set voltage VS that is charged thereon before the parallel connection is measured. On the second occasion, pixel capacitance CP is charged with pixel voltage VP and a known reference capacitance &Dgr;CS is connected in parallel with line capacitance CS, this being charged with set voltage VS.
    Type: Grant
    Filed: May 24, 1999
    Date of Patent: July 17, 2001
    Assignee: Asia Electronics, Inc.
    Inventor: Tadashi Tamukai