Patent ID: 6181330
Filing Date: 2001-01-30
Classification: G09G

Abstract:
A display width adjustment circuit for use with a video display and an input video signal having a horizontal synchronizing signal and a vertical synchronizing signal, said circuit comprising:a key circuit for user control of at least one of an amount of expansion and an amount of compression of at least one of a horizontal display area and a vertical display area of the video display;a detector for detecting i) a state of said key circuit and ii) a frequency of at least one of the horizontal and vertical synchronizing signals of the input video signal;a PLL circuit which receives a frequency division ratio from said detector;an A/D converter which receives the video signal and is controlled by an output of said PLL circuit; anda scan converter which receives i) an output signal from said A/D converter, and ii) at least one of the horizontal and vertical synchronizing signals, and outputs a converted video signal for displaying a corresponding video image on the video display.