Video circuit with screen-burn-in protection

Details Video circuit with screen-burn-in protection Video circuit with screen-burn-in protection

H - Electricity

04

N

375/46, 350/3.5

H04N 5/21 (2006.01) H04N 3/20 (2006.01) H04N 5/68 (2006.01)

Patent

CA 1114535

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

313084

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