Patent ID: 6686969
Filing Date: 2004-02-03
Classification: G09G,H03L,H04N

Abstract:
An apparatus which samples video signals at a calculated phase and provides the sampled signal to a display device, comprising:a sampling portion for sampling a video signal at a rate of a half period which is Â½ times a video period of the video signal; a selecting portion for outputting as a display signal every other sampled signal which is the video signal sampled at the rate of said half period; a phase adjusting portion for adjusting the phase of the sampling performed by said sampling portion within a given variable-phase range; an absolute difference value calculating portion for calculating an absolute difference value which is, when said sampled signals are numbered with respect to one of said sampled signals in order of sampling time, the absolute value of a difference between an odd-numbered sampled signal and the next even-numbered sampled signal; a maximum absolute difference value calculating portion operatively connected to said absolute difference value calculating portion for calculating a maximum absolute difference value which is a maximum value in a plurality of said absolute difference values; a phase control portion operatively connected to said maximum absolute difference value calculating portion for controlling said phase adjusting portion under the restriction of said variable-phase range so that said display signal comprises the sampled signals sampled at a phase which is the closest to a phase set at or near the center of a rising transition in which said maximum absolute difference value increases as said phase delays; and a video signal processing circuit for processing the display signal and outputting the processed display signal to a display screen.