Patents by Inventor Yuji Hama

Yuji Hama 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).

  • Power saving display subsystem for portable computers
    Patent number: 5548765
    Abstract: A computer system, according to an embodiment of the present invention comprises a host CPU, an image rendering device, a CRT image memory, a video subsystem, an alternative display converter, an alternative display memory, an LCD controller, a change-of-status (COS) detector, a power up/down controller, and a computer display screen. The COS detector monitors the host CPU, image rendering device, CRT image memory, looking for updates that would require a change in the image displayed on the computer display screen. The COS detector signals the power up/down controller to power-off and/or slow system clocks to the CRT image memory, the video subsystem, the alternative display converter, the alternative display memory, and the LCD controller when there is no change to be made in the image on the computer display screen.
    Type: Grant
    Filed: March 2, 1994
    Date of Patent: August 20, 1996
    Assignee: Seiko Epson Corporation
    Inventors: Takeo Tsunoda, Hitomi Aizawa, Yuji Hama