Auto convergence circuit

Details Auto convergence circuit Auto convergence circuit

H - Electricity

04

N

355/3

H04N 9/28 (2006.01) H04N 9/24 (2006.01)

Patent

CA 1309190

ABSTRACT OF THE DISCLOSURE 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 re- sult of the integration. The effect of noise included in the detected signal is thereby reduced, and conver- gence correction with increased accuracy is obtained.

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