Method and apparatus for three-way power switching

Details Method and apparatus for three-way power switching Method and apparatus for three-way power switching

1995-06-19

1998-06-09

Elmore, Reba I.

Boots, shoes, and leggings

345211, 345212, 395750, G06F 100

Patent

active

057645477

ABSTRACT:
A three-way power switch for turning on and off an entire computer system with a single switch. The host computer includes a soft-start circuitry for detecting display data channel (DDC) activation signals from a DDC-capable monitor. Thus, a toggle power switch on the monitor turns on and off the entire system, where the computer powers up or down based on the presence or absence, respectively, of the DDC signals. In a second embodiment, the monitor includes soft-start circuitry which detects the presence/absence of video signals from the host computer for powering up/down the monitor, respectively. Thus, in the second embodiment, a power switch either on the monitor or computer system is used to turn on and off the entire system. A third embodiment is similar to the second embodiment except bi-directional DDC2 signals are used as an activation signal to power up or down the monitor.

REFERENCES:
patent: 5424903 (1995-06-01), Schreiber
patent: 5483260 (1996-01-01), Parks et al.
patent: 5513359 (1996-04-01), Clark et al.
Accuvue.RTM. Color Monitor HM-4921-D (User's Manual) Copyright.COPYRGT. Hitachi, Ltd. 1995.

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