Patent ID: 7589797

Claim:
A liquid crystal display projection system, comprising: a planar light source, including a plurality of light emitting units arranged in an array, each light emitting unit comprising: a conoid-like reflective surface, wherein an edge of a light outputting surface of the conoid-like reflective surface and that of the adjacent conoid-like reflective surface are conformal; and a set of light emitting device controlling the light emission of a planar light source, wherein the planar light source emits either a white beam or cyclically R/G/B light beams in succession; a first polarization filter receiving the planar light source and polarizing the same to a first polarization light beam in a first polarization state; a transmitting-type liquid crystal light valve receiving the first polarization light beam for converting the first polarization state based on a gray scale to produce a second polarization state having the corresponding gray scale; a second polarization filter receiving a light output from the liquid crystal light valve to produce a second polarization light beam in the second polarization state; and a projection unit projecting the second polarization light beam onto a display plane.