Patent ID: 7686453
Filing Date: 2010-03-30
Classification: G02B,G03B,H04N

Abstract:
1. A projection system, comprising: a projection lens unit; a color combiner; at least a first and a second image-forming devices capable of producing respective first and second image light beams when illuminated, the first and second image light beams from the at least two image-forming devices being combined in the color combiner to produce a color-combined image light beam containing at least a first color and a second color, the color-combined image light beam passing from the color combiner to the projection lens system; a first polarization control element disposed between the color combiner and the first image-forming device, the first polarization control element being capable of altering polarization of light of the first color passing therethrough and not altering the polarization of light of the second color passing therethrough; and a second polarization control element disposed between the color combiner and the second image-forming device, the second polarization control element being effective at altering polarization of light of the second color passing therethrough and not altering the polarization of light of the first color passing therethrough.