Standby system for video display

Details Standby system for video display Standby system for video display

1983-12-07

1987-02-03

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358190, 307116, H04N 557

Patent

active

046411917

ABSTRACT:
A video display system is normally operated to produce a low brightness display on a CRT. Viewer sensing apparatus, including a transmitter and a receiver, senses the presence of a viewer by reflection of ultrasonic energy and operates a transistor having a time delay switch coupled in its load circuit for instantaneously supplying full power to the display system to produce a normal brightness display on the CRT. A transistor override circuit simulates closure of the time delay switch in response to an override signal for producing a full brightness display on the CRT independent of the time delay switch. The time delay switch maintains a full brightness display on the CRT for a predetermined time after the viewer leaves.

REFERENCES:
patent: 3164673 (1965-01-01), Sharon
patent: 3165582 (1965-01-01), Korda
patent: 4031408 (1977-06-01), Holz
patent: 4088928 (1978-05-01), Waehner
patent: 4225808 (1980-09-01), Saraceni
patent: 4270157 (1981-05-01), Clark
patent: 4321593 (1982-03-01), Ho
patent: 4417278 (1983-11-01), Hensleigh

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