Anti-spot burn protection for CRT

Details Anti-spot burn protection for CRT Anti-spot burn protection for CRT

1979-09-19

1981-06-23

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2952

Patent

active

042753384

ABSTRACT:
A video amplifier circuit for a cathode ray tube in a video display includes an anti-spot burn protection system for preventing damage to the fluorescent screen when deflection voltages are removed as in tube turn-off. A diode network in the video amplifier circuit controls the rate of voltage decay on the CRT's cathode and brightness control grid following the removal of power, maintaining a pre-determined brightness control grid-cathode voltage differential thereby precluding tube turn-on.

REFERENCES:
patent: 3448328 (1969-06-01), Horio et al.
patent: 3946275 (1976-03-01), Marino

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