Patent ID: 6088067
Filing Date: 2000-07-11
Classification: G02B,G02F

Abstract:
A liquid crystal projector system, comprising:a light source;a liquid crystal light modulator;a reflective polarizer disposed between the light source and the light modulator, the reflective polarizer including layers of a first material and a second material having a refractive index difference between the first and second material along a first axis which is large enough to substantially reflect light of a first polarization state and a refractive index difference between the first and second material along a second axis, orthogonal to the first axis, which is small enough to substantially transmit light of a second polarization state;a reflector disposed to redirect light reflected by the reflective polarizer; anda retarder film disposed between the reflector and the reflective polarizer,wherein at least 15% of light of the first polarization state reflected by the reflective polarizer is converted to the second polarization state and redirected for transmission to the light modulator by the reflector and retarder film.