Geometry and focus correction circuit

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

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Details

H01J 2956

Patent

active

040398994

ABSTRACT:
A circuit to correct for pincushion distortion and defocusing in a cathode-ray tube having electromagnetic deflection systems is disclosed. The circuit, which may be realized in monolithic integrated-circuit form, performs a mathematical function to predistort the deflection signal for each axis by the amount necessary to provide an undistorted display. The circuit also provides a signal to correct for the defocusing that occurs at the edges of the screen. The circuit may be readily adapted for use with cathode-ray tubes having different diagonal deflection angles, and with either flat of curved faceplates, by changing the values of two resistors.

REFERENCES:
patent: 3517252 (1970-06-01), Williams
patent: 3772566 (1973-11-01), Schwartz
patent: 3825796 (1974-07-01), Bello

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