CRT BEAM CURRENT CONTROL APPARATUS

摘要

In a television picture display device wherein a cathode of a picture display tube is driven by an emitterfollower and a control signal for a beam current reference level control circuit is obtained from the collector circuit of this emitter-follower, measures are taken to compensate 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 blackerthan-black current can be processed by the beam current reference level control circuit.