Patent ID: 6225762
Filing Date: 2001-05-01
Classification: G09G,H04N

Abstract:
A circuit for correcting a moire effect on a display, comprising:a moire adjustment circuit to receive a horizontal synchronization signal having a horizontal scanning frequency and a moire adjustment signal substantially proportional to a horizontal spatial offset of alternate display lines on the display to correct the moire effect, the moire adjustment circuit generating a horizontal position signal having a first frequency proportional to the horizontal scanning frequency and a position value substantially proportional to the moire adjustment signal and the horizontal scanning frequency;a horizontal position control circuit, coupled to the moire adjustment circuit, that generates a horizontal reference signal having a second frequency substantially equal to the horizontal scanning frequency and a reference phase that is shifted from a synchronization phase of the horizontal synchronization signal substantially in proportion to the horizontal position signal; anda horizontal driver circuit, coupled to the horizontal position control circuit, that generates a flyback pulse having a third frequency substantially equal to the horizontal scanning frequency and a flyback phase that is substantially equal to the reference phase, the flyback phase controlling a horizontal position of lines on the display to correct the moire effect.