Patent ID: 6900951

Claim:
A display optical system, comprising: a reflection type display device for displaying an image, an illumination light source for illuminating said reflection type display device, an illumination optical system for guiding light from said illumination light source to said reflection type display device, a relay optical system for projection of an image appearing on said reflection type display device said relay optical system being a decentered prism optical system comprising at least one reflecting surface, wherein said at least one reflecting surface is curved in such a way as to give power to a light beam and provide a rotationally asymmetric surface; and an eyepiece optical system for converging a light beam from said relay optical system at a predetermined position, wherein: said eyepiece optical system is located at or near a position of an image projected through said relay optical system; and said illumination optical system and said decentered prism optical system have at least one common optical surface.