Patents by Inventor Yoshirou Yamaha

Yoshirou Yamaha 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).

  • Display panel drive circuit
    Patent number: 7233322
    Abstract: To reduce degradation of image quality when constructing anode line drive circuits in a display panel drive circuit from a plurality of IC chips. Dummy drive output and proper drive output of an adjoining IC chip are switched in predetermined cycles and supplied to an anode line. This makes it possible to reduce variation in adjacent output currents among IC chips. Thus, it is possible to reduce luminance differences in display areas caused by differences in current driving capacity among IC chips and reduce degradation of image quality when an anode line drive circuit is constructed from a plurality of IC chips.
    Type: Grant
    Filed: August 22, 2002
    Date of Patent: June 19, 2007
    Assignee: Asahi Kasei Microsystems Co., Ltd.
    Inventors: Satoshi Takehara, Yoshirou Yamaha
  • Display panel drive circuit
    Publication number: 20040008074
    Abstract: To reduce degradation of image quality when constructing anode line drive circuits in a display panel drive circuit from a plurality of IC chips.
    Type: Application
    Filed: April 18, 2003
    Publication date: January 15, 2004
    Inventors: Satoshi Takehara, Yoshirou Yamaha