Geometry and focus correction circuit

Details Geometry and focus correction circuit Geometry and focus correction circuit

H - Electricity

01

J

355/9

H01J 29/56 (2006.01) H04N 3/233 (2006.01)

Patent

CA 1096049

GEOMETRY AND FOCUS CORRECTION CIRCUIT ABSTRACT OF THE DISCLOSURE 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.

270352

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