Patent ID: 9039185
Filing Date: 2015-05-26
Classification: G03B,H04N

Abstract:
1. A LCOS projection system, comprising: an illumination device for providing a plurality of lighting beams; a LCOS microdisplay element for showing an electronic image; a polarization beam splitter, wherein a first portion of said lighting beams are transmissible through said polarization beam splitter and directed to said LCOS microdisplay element, wherein when said first portion of said lighting beams are reflected by said LCOS microdisplay element, said lighting beams are converted into a plurality of imaging beams in response to said electronic image; an optical projection lens for receiving said imaging beams and projecting said imaging beams onto a screen; and a beam recycling module, wherein when a second portion of said lighting beams from said polarization beam splitter are introduced into said beam recycling module, a polarization state of said second portion of said lighting beams is converted by said beam recycling module, and said second portion of said lighting beams in said converted polarization state are directed to said polarization beam splitter again, wherein said beam recycling module at least comprises a total internal reflection prism, wherein said lighting beams from said illumination device are transmissible through said total internal reflection prism, and said second portion of said lighting beams from said polarization beam splitter are subject to a total internal reflection on said total internal reflection prism, wherein said total internal reflection prism is arranged between said illumination device and said polarization beam splitter and 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.