Circuit for combining AKB and selective beam current...

Television – Cathode-ray tube display automatic black level bias control

Reexamination Certificate

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Details

C348S380000, C348S657000, C348S697000, C315S387000

Reexamination Certificate

active

06897901

ABSTRACT:
A control circuit for use in a video processor utilizes combined automatic kinescope bias (AKB) control, and average individual beam current sensing and limiting in at least one CRT. The control circuit includes automatic kinescope bias (AKB) control circuitry for detecting a magnitude of individual red (R), green (G) and blue (B) cathode currents driving corresponding R, G and B CRTs, generating R, G and B average cathode current control signals therefrom, and using the R, G and B average cathode current control signals as feedback to the video processor to reduce the R, G and B cathode currents approximately equal current amounts. Selective beam current limiting circuitry within the control circuitry compares at least one of the R, G and B average current control signals with a predetermined signal, and whereupon the at least one of the R, G and B average current control signals exceeds the predetermined signal, introducing a gain reduction in corresponding video gain stages within the video processor to limit the at least one of the R, G and B average current control signals.

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patent: 0977443 (2000-02-01), None

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