Auto convergence circuit

Details Auto convergence circuit Auto convergence circuit

1988-10-31

1990-01-23

Tarcza, Thomas H.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 10, H01J 2970, H04N 1702

Patent

active

048960810

ABSTRACT:
An electronic circuit automatically corrects the convergence of an electron beam of a color cathode ray tube. Light reflected upon scanning by the electron beam of an index pattern disposed at a predetermined position on the shadow mask of the color cathode ray tube is detected by a photodetector. A detected signal representative of the scanning position of the electron beam is obtained, and convergence error information is obtained based on the detected signal. The correcting circuit comprises an integrator for integrating the detected signal produced during a plurality of traverses of the index pattern by the electron beam. The convergence error information is based on the result of the integration. The effect of noise included in the detected signal is thereby reduced, and convergence correction with increased accuracy is obtained.

REFERENCES:
patent: 4617495 (1986-10-01), Culter

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