Patents by Inventor Ken Kumakura

Ken Kumakura 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: 6151000
    Abstract: A display apparatus and display method are provided for a display panel having pixels arranged in a matrix form for displaying an image on a effective display area. Horizontal electrodes and vertical electrodes in the display panel are scanned for selectively illuminating said pixels by using a time sharing drive method in which one field period is divided into plural sub-fields weighted according to a sustaining period. As a result, an effective display area is divided into plural areas, no scanning for selecting a light emitting pixel is executed in a non-display area, and the number of sub-fields is increased in an area in which display in multiple gradations is required in a display area to obtain sufficient gradation. Instead of increasing the number of the sub-fields, the total sustaining period per one field is increased to obtain sufficient brightness.
    Type: Grant
    Filed: May 12, 1997
    Date of Patent: November 21, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Ohtaka, Masaji Ishigaki, Yasuji Noguchi, Yuichiro Kimura, Ken Kumakura