Patent ID: 8013848

Claim:
An image display apparatus having an illumination optical system and a projection optical system comprising: a light source; a light modulation element modulating illumination light coming from the light source on the basis of image data; an illumination area modification unit capable of reducing an illumination area for the light modulation element in order to illuminate a specific image-forming area in the image-forming area of the light modulation element, the specific image-forming area having a smaller size than an original image-forming area; an illumination optical system-optical axis-moving unit capable of translating an optical axis of the illumination optical system; a projection optical system-optical axis-moving unit capable of translating an optical axis of the projection optical system; and an image display-processing unit having an illumination area control unit for controlling the illumination area modification unit, a resolution conversion unit for converting a resolution of the image data into a resolution corresponding to the specific image-forming area, a first optical axis-moving unit control unit for controlling the illumination optical system-optical axis-moving unit, and a second optical axis-moving unit control unit for controlling the projection optical system-optical axis-moving unit, wherein the image display apparatus is a projector equipped with the illumination optical system having the light source and the projection optical system for projecting light modulated by the light modulation element, and the position of the specific image-forming area on the image-forming area of the light modulation element is changeable every predetermined time by translating the optical axis of the illumination light outputted from the illumination optical system.