Crt beam current control apparatus

Details Crt beam current control apparatus Crt beam current control apparatus

H - Electricity

04

N

350/83

H04N 5/68 (2006.01) H04N 5/16 (2006.01) H04N 9/72 (2006.01)

Patent

CA 1135837

ABSTRACT: In a television picture display device wherein a cathode of a picture display tube is driven by an emitter- follower and a control signal for a beam current reference level control circuit is obtained from the collector cir- cuit of this emitter-follower, measures are taken to compen- sate for leakage currents from and to the cathode. To this end a blacker-than-black current compensation circuit is provided while furthermore it is ensured that the blacker- than-black current can be processed by the beam current reference level control circuit.

319907

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