Black level tracking for multiple frequency apparatus

Details Black level tracking for multiple frequency apparatus Black level tracking for multiple frequency apparatus

1988-07-18

1991-01-15

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315411, H01J 2952

Patent

active

049856650

ABSTRACT:
A video display monitor operable at different horizontal deflection frequencies incorporates a circuit that produces an electron gun control grid potential that compensates for screen grid potential changes due to changes in operating frequency. A sawtooth signal is generated that has a peak to peak amplitude determined in response to the deflection frequency. The sawtooth signal is peak detected to produce a direct voltage, for the control grid, that varies in response to the horizontal deflection frequency.

REFERENCES:
patent: 2993142 (1961-06-01), Harvey
patent: 3465200 (1969-09-01), Higbee et al.
patent: 3775637 (1973-11-01), Brady
patent: 3831057 (1974-08-01), Meyer
patent: 3980822 (1976-09-01), Suzuki et al.

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