Patent ID: 7918561

Claim:
A projection display device comprising: a light source; a cooling unit for cooling the light source; a plurality of imagers individually disposed corresponding to light in at least three wavelength bands; a light guiding optical system for guiding the light in the respective wavelength bands, among light from the light source, to the corresponding imagers respectively; a photosynthesis element for synthesizing the light in the respective wavelength bands modulated by the imagers; and a projection optical system for projecting the light synthesized by the photosynthesis element, wherein a first axis which is formed by lengthening an optical axis of the light source with respect to the light right after being emitted from the light source and a second axis which is formed by lengthening an optical axis of the projection optical system approximately orthogonally intersect, and at the same time, the light guiding optical system protrudes in an opposite direction from a position of the projection optical system with regard to the first axis.