Patent ID: 7434944
Filing Date: 2008-10-14
Classification: G03B,H04N

Abstract:
1. An image projection apparatus comprising: a reflective display device that has pixels and that displays an image through angle modulation of the pixels; a light source that emits illumination light for illuminating the display device; an illumination optical system that directs the illumination light from the light source to the display device; and a projection optical system that has four curved-surface mirrors and that projects, as image light, light representing the image from the display device, wherein a deflection axis of the pixels is parallel to longer sides of a rectangular display area of the display device, wherein a center of an entrance pupil of the projection optical system is located at a position displaced from a line normal to a center of the display area in a direction parallel to shorter sides of the display area, wherein a center of an exit pupil of the illumination optical system is located at a position displaced from the line normal to the center of the display area in the direction parallel to the shorter sides of the display area but opposite to the direction in which the center of the entrance pupil of the projection optical system is displaced from the line normal to the center of the display area, wherein the illumination optical system is so arranged that the image light from the display device passes through the entrance pupil of the projection optical system, and wherein the projection optical system has a lens between a first mirror and a second mirror as counted from a display device side thereof.