Patent ID: 7946710

Claim:
A projection display, for modulating lights into an optical image through an image display element, thereby projecting the optical image from a projection lens, enlargedly, comprising: a light source, which is configured to emit the lights; an optical integrator, which is configured to equalize illuminance distribution of the lights from said light source; a color separation optic system, which is configured to separate the lights emitted from said optical integrator into a plural number of light components which pass along respective optical paths to the image display element; a relay optic system disposed in the optical path of one of the separated light components so as to provide an optical path length of the one of the separated light components from the light source to the image display element thereof which is longer than an optical path length of other separated light components from the light source to the image display element thereof; said relay optic system having a plural number of relay lenses, each of which is configured to sequentially relay the light of the one of the separated light components by said color separation optic system; and a rotation adjuster, which is provided in at least any one of said plural number of relay lenses, and configured to adjust an inclination angle thereof, with respect to a light axis of the lights emitted from said light source.