| 摘要 |
PURPOSE:To make it possible to correct the distortion of a picture image with high accuracy with a small scale circuit by merging distortion correction waveforms generated fro two distortion correction waveform generating circuits and correcting the distortion of a picture image. CONSTITUTION:Each corrected output from a low grade deflected distortion correction waveform generating circuit 30, a four cornors independent correction waveform generating circuit 31 and a digital system correction waveform generating circuit 32 are inputted to a deflecting circuit 33 in a red color channel horizontal direction. This corrected waveform is piled up on a horizontal saw tooth waveform 34 and after converted to current, it is outputted to a deflecting coil 35 and a deflecting distortion is corrected. So that it is possible to suppress the deflecting distortion of a picture under 0.6% when a low grade deflection correction waveform and a four cornors independent correction waveform are merged, the corrected waveform by a digital system does not change so much and the generation of shading is prevented and also,the memory size of the digital system correction waveform generating circuit 32 is restrained less than normal and it is constituted with a small scale circuit because a correcting capacitance in the digital system is enough with a six bits length. Thereby, it is possible to obtain a picture image distortion correction with high accuracy. |
