Patent ID: 6118232
Filing Date: 2000-09-12
Classification: G09G,H04N

Abstract:
A circuit for compensating distortion of a picture which is displayed on a display unit having a yoke, said compensating circuit controlling a yoke current to compensate a picture distortion, wherein said compensating circuit comprises:first signal generator for generating a digital deflecting compensation signal in accordance with deflecting compensation data representative of compensation value of said picture;second signal generator for generating a variable voltage in accordance with a PWM pulse signal to control said yoke current on the basis of said variable voltage;peak voltage holder for holding a peak voltage of a flyback pulse based on said variable voltage to produce a peak voltage signal representative of said peak voltage;A/D converter for converting said peak voltage signal into a digital peak signal;adder for calculating a sum of said digital deflecting compensation signal and said digital peak signal to produce a digital sum signal;phase comparator for comparing said digital sum signal with digital size signal representative of size of said picture to produce a phase difference signal representative of a phase difference between said digital sum signal and said digital size signal; andPWM pulse signal outputter for outputting said PWM pulse signal in response to said phase difference signal.