Low-power-consumption monitor standby system

Details Low-power-consumption monitor standby system Low-power-consumption monitor standby system

1993-10-22

1995-02-14

Brier, Jeffery

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

345213, 348730, G09G 500, G09G 512, H04N 563

Patent

active

053899520

ABSTRACT:
A system for lowering the power output of a video display monitor for a computer during periods of operator inactivity senses the presence or absence of horizontal synchronization (HSYNC) and vertical synchronization (VSYNC) signals, which are normally supplied by the host computer to synchronize data transfer to the video monitor with horizontal and vertical sweep circuitry. Time sensing means at the host senses inactivity, and suspends one or another of the HSYNC and VSYNC signals. Sync sensing and control means in the monitor senses the absence of one or both of the HSYNC and VSYNC signals, and controls power-using circuitry in the monitor in response. In an embodiment applicable to monitors having a microprocessor, the system may be incorporated entirely in software at the host and the monitor. In dumb monitors, the system requires add-in and/or add-on devices cooperating with software.

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patent: 4751502 (1988-06-01), Ishii et al.
patent: 5059961 (1991-10-01), Cheng
patent: 5079666 (1992-01-01), Najm
IBM Personal System/2.TM. and Personal Computer BIOS Interface Technical Reference by IBM, 1987, pp. 4-59 to 4-61 and 4-121 to 4-125.
Paradise VGA Plus Card User's Manual, 1988, Appendix D.

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