Patent ID: 6201535
Filing Date: 2001-03-13
Classification: G09G

Abstract:
An apparatus, comprising:a video display conveying varying visual information to a user;a clock unit generating a first clock signal with a frequency corresponding to a synchronous signal received from a host;a delay circuit receiving said first clock signal from said clock unit, delaying said first clock signal by a quantity of time, and outputting a delayed clock signal;a first converter receiving an analog video signal from the host and outputting a voltage corresponding to said analog video signal;a detector unit receiving said voltage from said first converter unit and said delayed clock signal from said delay circuit, detecting a phase difference between said voltage and said delayed clock signal, and outputting phase difference data;a comparator receiving delay data corresponding to said synchronous signal, receiving said phase difference data, comparing said delay data and phase difference data, and outputting a comparison signal;a control unit receiving said synchronous signal from the host and said comparison signal from said comparator, outputting said delay data to said comparator, generating said delay data in response to said comparison signal in order to modify said quantity of time to adjust a phase of said first clock signal; anda second converter converting said analog video signal to a corresponding digital video signal in response to said delayed clock signal, and outputting said digital video signal to said video display, said digital video signal corresponding to the visual information.