To reduce color separation of an image display device capable of performing two-screen display while maintaining resolution.

On a display panel, a slit is provided at a position corresponding to a portion between adjacent pixel display units. Input images for left and for right are input as input images, and respective pixel data are arranged alternately in a longitudinal direction and a lateral direction to be displayed on the display panel. Display pixel data corresponding to specific input pixel data in the input images are generated based upon the specific input pixel data in the input image and at least one adjacent input pixel data vertically or horizontally adjacent to the specific input image data in the same input image.