The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 13, 2004
Filed:
Mar. 16, 1999
Apparatus and method for a personal computer system providing non-distracting video power management
Toru Aihara, Yokohama, JP;
Sanehiro Furuichi, Kawasaki, JP;
Hiroshi Ishikawa, Shizuoka, JP;
Noboru Kamijo, Fujisaw, JP;
Kazuo Sekiya, Tokyo-to, JP;
Susumu Shimotono, Hadano, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
To change the frequency of a video clock without adversely affecting a display quality. To lower the frequency of a video clock, following steps are executed, detecting an opportunity which causes the reduction of the frequency of the video clock; lowering the frequency of the video clock in a frequency range within which a circuit employing the video clock (for example, a PLL (Phase Lock Loop) circuit) can follow a change in the frequency; and iterating the step of lowering the frequency of the video clock until a predetermined frequency is attained. In addition, the following steps are also performed, detecting an opportunity which causes the reduction of the frequency of the video clock; lowering the frequency of the video clock to a predetermined frequency during a vertical blanking interval of a display device that employs the video clock; and maintaining the predetermined frequency of the video clock until change of the frequency is required. Furthermore, the following steps are performed, detecting an opportunity which causes the reduction of the frequency of the video clock; changing a display color on a screen of a display device to a color for which flickers are not outstanding; and lowering the frequency of the video clock.