Patent ID: 6011364
Filing Date: 2000-01-04
Classification: H04N

Abstract:
An upper and lower distortion correcting circuit by modes in a display device, said circuit comprising:a parabolic generator for receiving a vertical pulse and for generating a parabolic wave in accordance with the received vertical pulse;a multivibrator for receiving a horizontal pulse outputted by a microcomputer via a digital to analog converter and for triggering the horizontal pulse in accordance with a horizontal balance signal outputted by said digital to analog converter to adjust and output a triggered horizontal pulse having a controlled duty cycle;a multiplier for multiplying the horizontal pulse outputted by said multivibrator and the parabolic wave outputted by said parabolic generator to thereby output a correction current;a buffer for stabilizing and outputting the correction current outputted by said multiplier;an amplifying portion for receiving and amplifying the correction current outputted by said buffer; anda modulation portion for receiving the correction current outputted by said amplifying portion and the vertical pulse and for superimposing the correction current and the vertical pulse.