Screen Distortion Correction Circuit of Multi-Screen Color Television

摘要

The present invention relates to a screen distortion correction circuit for a multi-screen color television which is adapted to improve fluctuation or distortion of amplitude of a picture (PIP) picture according to fluctuation of a high-voltage beam current. The picture distortion correction circuit includes a first waveform shaping unit A second waveform shaping unit 12 for shaping the waveform of the vertical synchronizing signal, a luminance signal extracting unit 14 for extracting only the luminance signal from the color synthesized video signal, a luminance signal extracting unit 14 for extracting the luminance signal from the luminance signal extracting unit, A pincushion correction control unit 18 for controlling the pincushion correction amount by accumulating the waveform-shaped horizontal and vertical synchronizing signals, a pincushion correction unit 18 for performing pincushion correction according to a control signal of the pincushion correction control unit, A luminance level is detected and integrated in a multi-screen color television equipped with a display unit 20, and a pincushion correction signal output inversely is applied to the pincushion correction control unit 18 to perform horizontal cushion correction It is configured having a pincushion correction signal generation portion 22 so that.