Upper and lower distortion correcting circuit by modes
 An upper and lower distortion correcting circuit by modes in a display device which displays a video signal as a visible image, includes: a parabolic generator for receiving a vertical pulse to generate a parabolic wave in accordance with the received vertical pulse; a multivibrator for s receiving a horizontal pulse outputted from a microcomputer and for triggering the horizontal pulse in accordance with a horizontal balance signal outputted from a 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 from the multivibrator and the parabolic wave outputted from the parabolic generator to thereby output a correction current; a buffer for stabilizing and outputting a gain of the correction current outputted from the multiplier; an amplifying portion for receiving and amplifying the gain of the correction current outputted from the buffer; and a modulation portion for receiving the correction current outputted from the amplifying portion and the vertical pulse and for superimposing the correction current and the vertical pulse to generate a combined correction wave. 
SamSung Electronics Co., Ltd.
H
H04N
inventional
Seung-Taek
Lee