Power saving display subsystem for portable computers

Details Power saving display subsystem for portable computers Power saving display subsystem for portable computers

1994-03-02

1996-08-20

Davis, George B.

Boots, shoes, and leggings

364DIG1, 359630, G06F 100

Patent

active

055487653

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. And conversely, the COS detector signals the power up/down controller to power-up and/or restore system clocks to full-speed for the CRT image memory, the video subsystem, the alternative display converter, the alternative display memory, and the LCD controller when a change (update) is to be made in the image on the computer display screen.

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