CRT Beam current control apparatus

Details CRT Beam current control apparatus CRT Beam current control apparatus

1978-12-22

1980-09-23

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358243, 358 74, H04N 568

Patent

active

042246407

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 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 blacker-than-black curent can be processed by the beam current reference level control circuit.

REFERENCES:
patent: 3598913 (1971-08-01), Janssen

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