Patent ID: 8896769

Claim:
A projection system, comprising: an illumination device for providing a source ray including a plurality of lighting beams in a first polarization state and a plurality of lighting beams in a second polarization state; a LCOS microdisplay element for showing an electronic image, wherein when said lighting beams in said first polarization state are directed to said LCOS microdisplay element, said lighting beams in said first polarization state are reflected by said LCOS microdisplay element, and said lighting beams in said first polarization state are converted into a plurality of imaging beams in said second polarization state in response to said electronic image; an optical projection lens for receiving and projecting said imaging beams in said second polarization state onto a screen; and an optical processing module arranged between said illumination device, said LCOS microdisplay element and said optical projection lens, wherein when said source ray is received by said optical processing module, said lighting beams of said source ray in said second polarization state are filtered off, and said lighting beams of said source ray in said first polarization state are outputted from said optical processing module to said LCOS microdisplay element, wherein said imaging beams in said second polarization state are received by said optical processing module and outputted to said optical projection lens, wherein said optical processing module at least comprises a total internal reflection prism and a polarizer, wherein said lighting beams in said second polarization state are blocked by said polarizer; wherein said total internal reflection prism comprises a first prism and a second prism, wherein said first prism comprises a lighting beam incidence plane and a first facing plane, and said second prism comprises an imaging beam emergence plane, a second facing plane, and a second prism plane arranged between said imaging beam emergence plane and said second facing plane, wherein said first facing plane and said second facing plane are separated from each other by a gap, and after said imaging beams in said second polarization state are at least transmitted through said second prism plane of said second prism, said imaging beams in said second polarization state are directed to and reflected by said second facing plane of said second prism, and said reflected imaging beams in said second polarization state are at least transmitted through said imaging beam emergence plane of said second prism and directed to said optical projection lens.