Patent ID: 6987546

Claim:
A projection type image display apparatus comprising: (a) a light source; (b) a display device which forms an optical image from light emitted from the light source according to an image signal; (c) a color separator which separates light emitted from the light source into light rays of plural colors; (d) a rotary polyhedral reflector which has plural reflective surfaces around a central axis, with each angle formed by neighboring reflective surfaces or neighboring reflective surface tangents smaller than 180 degrees on the light entrance/exit side; and, while rotating around the central axis, lets the reflective surfaces sequentially reflect color light rays from the color separator, and emits them to the display device; and (e) a projector which projects light rays from the display device as a color image, wherein color light rays thrown on the display device from the rotary polyhedral reflector scroll in a prescribed direction on the display device according to changing the reflective surface based on rotation of the rotary polyhedral reflector.