Convergence control apparatus for color cathode ray tube display

Details Convergence control apparatus for color cathode ray tube display Convergence control apparatus for color cathode ray tube display

1983-03-21

1985-02-19

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2976

Patent

active

045008167

ABSTRACT:
An active convergence correction apparatus for a full color cathode ray tube display of the delta gun shadow mask type wherein the horizontal and vertical parabolic waveshape compensation signals are generated by squaring circuits responsive to the horizontal and vertical deflection signals and wherein zero crossing detectors also responsive to the horizontal and vertical deflection signals, which effectively divide the viewing screen into rectangular coordinates, control switches which split each of the horizontal and vertical parabolic waveshape signals in half, whereby the relative amplitudes of each half can be independently controlled to achieve precise convergence in all sectors of the screen.

REFERENCES:
patent: 3766429 (1973-10-01), Vincent et al.
patent: 3942067 (1976-03-01), Cawood
patent: 4095137 (1978-06-01), Oswald
patent: 4203054 (1980-05-01), Sowter
patent: 4318032 (1982-03-01), Kureha

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