Gullwing distortion corrected deflection circuitry for a...

Details Gullwing distortion corrected deflection circuitry for a... Gullwing distortion corrected deflection circuitry for a...

H - Electricity

01

J

355/9

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

Patent

CA 1240402

Abstract Line and field deflection circuits generate line and field deflection currents in respective line and field deflection windings to scan a raster on the phosphor screen of a square-planar picture tube having an aspherical faceplate. The asphericity of the faceplate subjects the scanned raster to gullwing distortion. A gullwing distortion correction circuit is responsive to signals repeating at line and field rates, respectively, for modulating the field deflection current during a line deflection period within the field deflection trace interval in a manner that corrects gullwing distortion of a corresponding raster scan line.

483692

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