Display screen blanking using interactive video and user-interfa

Details Display screen blanking using interactive video and user-interfa Display screen blanking using interactive video and user-interfa

1993-11-29

1995-09-05

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

348173, G09G 500

Patent

active

054482623

ABSTRACT:
A method and apparatus for reducing power consumption by a display device includes monitoring time intervals between successive updates by video update circuitry and time intervals between successive uses by one or more user-interface devices, such as a mouse or keyboard. A first time-elapsed signal is generated if a predetermined time interval is exceeded between successive uses by the user-interface devices. A reset input to a first timer is connected to the user-interface devices to restart the timing with each use. A second time-elapsed signal is generated if the interval between successive video updates exceeds a second predetermined time period. Video updating resets the timer used to monitor the video update circuitry, but once the second time-elapsed signal has been initiated, a video update will not disable the signal. Rather, the second time-elapsed signal is latched until the use of a user-interface device. Simultaneous occurrence of the first and second time-elapsed signals generates an interrupt signal for reducing power consumption by a display device.

REFERENCES:
patent: 3928960 (1975-12-01), Reese
patent: 4158230 (1979-06-01), Washizuka et al.
patent: 4677430 (1987-06-01), Falkman et al.
patent: 5059961 (1991-10-01), Cheng

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