Convergence correction apparatus for picture image display devic

Details Convergence correction apparatus for picture image display devic Convergence correction apparatus for picture image display devic

1994-05-10

1996-06-04

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2951

Patent

active

055236570

ABSTRACT:
A convergence correction apparatus for a picture image display device including a picture tube provided with an anode and a convergence coil, for displaying a picture image, a receiver for receiving a composite video signal, a separator for separating a horizontal periodic pulse and a vertical periodic pulse from the composite video signal, a convergence unit responsive to the horizontal periodic pulse for generating a high voltage convergence signal to be applied to the anode of the picture tube, a detector for detecting a fluctuation of the high voltage convergence signal, a ripple signal generator for generating a high voltage ripple signal corresponding to the fluctuation, a correction signal generator for generating a convergence correction signal including at least one of a horizontal periodic sawtooth wave signal, a vertical periodic sawtooth wave signal and a parabolic wave signal based on the horizontal periodic pulse and a vertical periodic pulse, an adjuster for adjusting the convergence correction signal by arithmetically processing the convergence correction signal with the high voltage ripple signal, and a supply unit for supplying the convergence coil of the picture tube with the adjusted convergence correction signal to cancel distortions of a picture image displayed in associated with the picture tube.

REFERENCES:
patent: 4611151 (1986-09-01), Hoover et al.

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