Patent ID: 8998418
Filing Date: 2015-04-07
Classification: G02B,G03B,H04N

Abstract:
1. A color light mixing device for providing a light source to illuminate a microdisplay element, said color light mixing device comprising: a tube structure; a plurality of light-emitting units for outputting light beams, wherein said light beams outputted from said light-emitting units are reflected or scattered within said tube structure for several times, so that said light beams are mixed with each other; a reflective polarizer located at an outlet end of said tube structure and receiving said mixed light beams including both P-polarized beams and S-polarized beams, wherein said P-polarized beams of said mixed light beams are permitted to be transmitted through said reflective polarizer, and said S-polarized beams of said mixed light beams are reflected back to said tube structure by said reflective polarizer and reflected or scattered within said tube structure for several times again; and a microlens assembly arranged between said tube structure and said reflective polarizer for changing directions of said mixed light beams from said tube structure to said reflective polarizer, thereby increasing randomness of said S-polarized beams of said mixed light beams reflected back to said tube structure by said reflective polarizer through said microlens.