LCOS projection system having beam recycling module with total internal reflecting prism

A LCOS projection system, comprising:

• an illumination device for providing a plurality of first lighting beams in a first polarization state and a plurality of second lighting beams in a second polarization state;
• a LCOS microdisplay element for showing an electronic image, wherein when any lighting beam is directed to and reflected by said LCOS microdisplay element, said lighting beam is converted into an imaging beam in response to said electronic image;
• an optical projection lens;
• and
• a beam processing module arranged between said illumination device, said LCOS microdisplay element and said optical projection lens, wherein when said first lighting beams in said first polarization state are received by said beam processing module, said first lighting beams in said first polarization state are outputted from said beam processing module to said LCOS microdisplay element, wherein when said second lighting beams in said second polarization state are received by said beam processing module, said second polarization state of said second lighting beams is converted into said first polarization state by said beam processing module, and said second lighting beams in said first polarization state are outputted from said beam processing module to said LCOS microdisplay element, wherein when said imaging beam is received by said beam processing module, said imaging beam is outputted from beam processing module to said optical projection lens, wherein said beam processing module at least comprises a total internal reflection prism, wherein said total internal reflection prism is arranged in a transmission path of said second lighting beams after said second polarization state of said second lighting beams is converted into said first polarization state, and said total internal reflection prism is also arranged in a transmission path of said first lighting beams and said second lighting beams from said illumination device,
• wherein said total internal reflection prism comprises a first prism and a second prism, said first prism comprises a first incidence plane and a first facing plane, said second prism comprises a second incidence plane and a second facing plane, and said first facing plane and said second facing plane face each other, and
• wherein said LCOS projection system has a lighting optical axis, a first angle between said first facing plane of said first prism and said lighting optical axis and a second angle between said second facing plane of said second prism and said lighting optical axis are both 45 degrees, said first prism and said second prism are both right triangular prisms if said illumination device is deviated from said lighting optical axis, and said first prism and said second prism are collectively combined as a parallelogram prism if said illumination device is not deviated from said lighting optical axis.

A LCOS projection system, comprising:

• an illumination device providing a plurality of lighting beams;
• a LCOS microdisplay element showing an electronic image;
• a polarization beam splitter splitting said lighting beams into at least a first portion and a second portion, wherein said first portion of said lighting beams are transmitted through said polarization beam splitter and directed to said LCOS microdisplay element, and said first portion of said lighting beams are reflected by said LCOS microdisplay element and converted into a plurality of imaging beams corresponding to said electronic image;
• an optical projection lens receiving said imaging beams and projecting said imaging beams onto a screen;
• and
• a beam recycling module disposed in a light path between said illumination device and said polarization beam splitter, passing therethrough said lighting beams before said lighting beams are split by said polarization beam splitter, receiving said second portion of said lighting beams from said polarization beam splitter, converting a polarization state of said second portion of said lighting beams and returning said second portion of said lighting beams in said converted polarization state to said polarization beam splitter, wherein said second portion of said lighting beams in said converted polarization state is transmissible through said polarization beam splitter.