Patent ID: 8373713

Claim:
An image display apparatus comprising: a memory including a first mode in which an image data is sequentially written and read per frame and a second mode in which the image data is sequentially written and read per sub-frame area obtained by dividing the frame; a compressor capable of switching a compression output state in which a compression image data generated by compressing an input image data is outputted and an uncompressed output state in which an uncompressed image data without compressing the input image data is outputted as the image data written in the memory; a decompressor capable of switching a decompression output state in which the compression image data read from the memory is decompressed to be outputted and a non-decompression output state in which the uncompressed image data read from the memory is not decompressed to be outputted; and a controller configured to switch the compressor from the uncompressed output state to the compression output state during a first input vertical blanking period, switch the decompressor from the non-decompression output state to the decompression output state at the same time as the first input vertical blanking period or during a first output vertical blanking period immediately after the first input vertical blanking period, and switch the memory from the second mode to the first mode during the first output vertical blanking period or a second output vertical blanking period immediately after the first output vertical blanking period, where a vertical blanking period of an input image to the compressor is defined as an input vertical blanking period and a vertical blanking period of an output image from the decompressor is defined as an output vertical blanking period.