Video circuit with screen-burn-in protection

Facsimile and static presentation processing – Static presentation processing – Attribute control

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Details

315380, 273138A, 273DIG28, 340713, 340723, 358220, H04N 522, H01J 2952, A63B 7100, G09F 932

Patent

active

043386237

ABSTRACT:
To prevent display screen burn-in of a picture having, for example, bright lines or other picture components remaining stationary for a long period of time, a video circuit is examined to detect how long the information has not been changed. If a predetermined time limit is exceeded, the picture brightness is limited to a sufficiently low average value or, if so desired, to zero brightness, by means of one or more protection switches.

REFERENCES:
patent: 3308333 (1967-03-01), Lent
patent: 3958152 (1976-05-01), Fogg et al.
patent: 3963961 (1976-06-01), Ray et al.
patent: 3995197 (1976-11-01), Caswell
patent: 4130830 (1978-12-01), Derickson
Home Library Computer: Scientific American, Sep. 1977, pp. 16-17.
Video Games: Consumer Reports, Nov. 1977, pp. 630-634.

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