Method and apparatus of automatically processing and correcting

Details Method and apparatus of automatically processing and correcting Method and apparatus of automatically processing and correcting

1980-07-09

1982-03-09

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358219, H01J 2952

Patent

active

043191665

ABSTRACT:
The blocking voltage of an electron gun is corrected by periodically removing an input video signal and driving a cathode with a DC stabilizing voltage. A pulse perturbation is impressed upon a control grid and the cathode momentarily conducts more heavily to exceed a predetermined threshold corresponding to the limit of a black CRT picture. A feedback loop detects a response signal from the perturbation of cathode current and stores the response signal in a memory, the latter determining the corrected blocking voltage during normal operation of the gun.

REFERENCES:
patent: 3855614 (1974-12-01), Okada
patent: 4012775 (1977-03-01), Smith

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