Patent ID: 7204613
Filing Date: 2007-04-17
Classification: G03B,H04N

Abstract:
1. A projection type display apparatus, comprising: a light source; an illumination optical system for condensing light radiated from the light source to form illumination light; a reflection type light valve for reflecting the illumination light to form an optical image; a projection optical system for projecting the optical image formed by the reflection type light valve; and a lens with positive power positioned between the reflection type light valve and the projection optical system, wherein the reflection type light valve, the projection optical system, and the lens with a positive power are disposed so that optical axes thereof are matched with each other, the illumination optical system is disposed so that the illumination light passes through the lens with a positive power to be reflected from the reflection type light valve, an output pupil of the illumination optical system and an entrance pupil of the projection optical system have a conjugate relationship with respect to the lens with a positive power, and an optical axis of the reflection type light valve, an optical axis of the projection optical system, and an optical axis of the reflection type light valve are all positioned on an identical straight line.