Brightness control circuit employing a closed control loop

Details Brightness control circuit employing a closed control loop Brightness control circuit employing a closed control loop

H - Electricity

01

L

350/57

H01L 23/48 (2006.01) H04N 5/59 (2006.01)

Patent

CA 1110758

BRIGHTNESS CONTROL CIRCUIT EMPLOYING A CLOSED CONTROL LOOP Abstract of the Invention Brightness control apparatus for a video signal image reproducing system including a video signal processing channel, a source of reference voltage for establishing a desired level of image brightness, and a keyed comparator circuit. The comparator forms a closed control loop with the signal processing channel, and is keyed during periodic blanking intervals of the video signal to sense the magnitude of the reference voltage and a brightness representative blanking level of the video signal which may vary undesirably. The comparator provides an output control signal indicative of a voltage difference between the reference voltage and the blanking level. The control voltage is applied to the signal channel for translating the blanking level in a direction to minimize the voltage difference, so that a desired relationship between the reference voltage and the blanking level is preserved.

302551

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