Patent ID: 7883213

Claim:
A liquid crystal projection system, comprising: a polarized light source providing a polarized white light beam of three primary colors; a separating element separating the polarized white light beam from the polarized light source into a monochromatic light beam containing one primary color of the three primary colors and a bichromatic light beam containing the remaining two primary colors of the three primary colors; a first reflecting element disposed on one output side of the separating element, the first reflecting element receiving and reflecting the monochromatic light beam from the separating element; a second reflecting element disposed on the other output side of the separating element, the second reflecting element receiving and reflecting the bichromatic light beam from the separating element; a half-wave plate transforming the polarization of an incident light beam from the first reflecting element; a first polarization separator disposed on the output side of the first reflecting element, the first polarization separator receiving and outputting the monochromatic light beam; a second polarization separator disposed on the output side of the second reflecting element, the second polarization separator receiving and polarization splitting the bichromatic light beam; a color separator disposed on one side of the second polarization separator, the color separator receiving and separating the bichromatic light beam; image modulation devices disposed on sides of the first polarization separator and the color separator, the image modulation devices transforming the polarizations of the monochromatic and bichromatic light beams and modulating the respective monochromatic and bichromatic light beams; and a projection lens disposed on one side of the second polarization separator, the projection lens projecting the transformed and modulated monochromatic and bichromatic light beams from the image modulation devices onto a screen for image display; wherein, the first polarization separator, the second polarization separator and the color separator are combined together as a unit with no additional optical elements disposed therebetween.