To reduce a blur of a moving image, which occurs on an image display device, while suppressing the attenuation in luminance level of a displayed image.

An image memory sequentially stores input image data of a plurality of inputted frames. A write control module controls a writing operation into the image memory, and a read control module controls a reading operation from the image memory. A driving image data generation module generates driving image data from read image data sequentially read from the image memory. The driving image data generation module generates the driving image data by replacing at least part of the read image data with mask data. A pixel value representative of the mask data is determined in accordance with a pixel value representative of the read image data corresponding to pixels to be replaced with the mask data.