Patent ID: 7134757

Claim:
A projection type display apparatus comprising: an illumination optical system for collecting light radiated from a light source to form illumination light; a reflection type light valve for reflecting the illumination light to output modulated light forming an optical image; a projection lens system for projecting the optical image formed by the reflection type light valve; and a lens element with a positive power, wherein the reflection type light valve has a plurality of pixels, and outputs the modulated light by controlling a reflection direction of the illumination light on a basis of each of the plurality of pixels, the lens element is composed of one plano-convex lens, and is placed between the reflection type light valve and the projection lens system with a convex surface directed to the projection lens system, in such a manner that the illumination light passes through the lens element to illuminate the reflection type light valve, and the modulated light output from the reflection type light valve passes through the lens element to be incident upon the projection lens system, and the reflection type light valve, the projection lens system, and the lens element are placed so that their optical axes are parallel to and matched with each other.