Patent ID: 7090350

Claim:
An optical projection system, capable of receiving a first light beam, a second light beam, and a third light beam, the projection system comprising: a color-combination prism, having a first surface, a second surface and a third surface, allowing the first, second and third light beams to respectively enter the first, second and third surfaces, so as to form a mixed beam to emit out from another surface; a projection lens set, for receiving the mixed beam for projection; a first wire grid polarizer (WGP), a second WGP and a third WGP, for respectively receiving and polarizing the first, second and third light beams and respectively reflecting the polarized beams to a first liquid crystal reflection panel, a second liquid crystal reflection panel and a third liquid crystal panel, wherein the first, second and third liquid crystal reflection panels are respectively positioned substantially parallel to the first, second and third surfaces of the color combination prism, and wherein the first, second and third liquid crystal reflection panels respectively receive the polarized light beams from the first, second and third WGPs and reflect polarized light beams to the first, second and third surfaces of the color combination prism; and a first polarizer, a second polarizer and a third polarizer, respectively disposed in a light path of each of the first, second and third light beams such that the first, second and third light beams are respectively incident to the first, second and third WGPs and are respectively reflected by the first, second and third WGPs to the first, second and third liquid reflection panels.