Patent ID: 7126642

Claim:
An image display apparatus, comprising: memory means for temporarily storing an input image signal; memory control means for controlling a readout start address for the memory means; display means having an image display screen to which an image signal read out of the memory means is input, the image display screen configured to display the input image signal by increasing an amount of overscan when an aspect ratio of the input image signal is different from an aspect ratio of said image display screen, so as not to change the aspect ratio of the input image signal; detection means for detecting the aspect ratio of the input image signal; and address control signal generation means to which an aspect ratio detection output is supplied from the detection means, for generating a readout start address control signal for the memory means from the input image signal, the address control signal generation means including a feature detection means for detecting a feature from said input image signal, a picture defect judgment means for judging a picture defect of the feature based on an output of the feature detection means and for shifting an image display position on the image display screen, the picture defect caused by the increasing of the amount of the overscan, and a screen shift amount determination means for determining, on the basis of the aspect ratio of the input image signal, a shift amount when the image display position is shifted by the picture defect judgment means wherein the readout start address for the memory means is controlled on the basis of the address control signal generated by the readout start address control signal generation means.