Raster distortion correction circuit

Details Raster distortion correction circuit Raster distortion correction circuit

1976-05-19

1977-12-13

Tubbesing, T.H.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

040631346

ABSTRACT:
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 deflection 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 deflecting 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.

REFERENCES:
patent: 2304057 (1942-12-01), Schade
patent: 2370426 (1945-02-01), Schade
patent: 2661443 (1953-12-01), Smith
patent: 3649870 (1972-03-01), Maulsby
patent: 3748531 (1973-07-01), Boekhorst et al.
patent: 3949167 (1976-04-01), Koyama et al.

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