Raster distortion correction circuit

Details Raster distortion correction circuit Raster distortion correction circuit

H - Electricity

04

N

350/102

H04N 3/16 (2006.01) H04N 3/233 (2006.01)

Patent

CA 1066403

RASTER DISTORTION CORRECTION CIRCUIT ABSTRACT OF THE DISCLOSURE A raster distortion correction circuit for correcting both pincushion distortion and trapezoidal distortion of a raster on a cathode ray tube. A parabolic-shaped signal and a sawtooth- shaped signal, both having frequencies equal to the vertical de- flection frequency, are supplied to the correction circuit. The amplitude and polarity of the sawtooth-shaped signal is selectively adjusted, and the adjusted sawtooth-shaped signal is combined with the parabolic-shaped signal and supplied to a current modulator. A horizontal deflecting current flows through the modulator and is thus modulated by the combined parabolic-shaped signal and adjusted sawtooth-shaped signal, the modulated horizontal deflect- ing current being supplied to a horizontal deflection coil included in the horizontal deflection circuit for the cathode ray tube. The parabolic-shaped signal component corrects the pincushion distortion and the adjusted sawtooth-shaped component corrects the trapezoidal distortion. -i-

253148

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