초록 ▼

A liquid crystal display projector including a light source, a collimator lens, a planar polarization converter, a liquid crystal display panel, and projection lenses. The collimator lens is optically aligned to receive a beam of light from the light source and to produce a collimated light beam. Th

A liquid crystal display projector including a light source, a collimator lens, a planar polarization converter, a liquid crystal display panel, and projection lenses. The collimator lens is optically aligned to receive a beam of light from the light source and to produce a collimated light beam. The planar polarization converter is optically aligned in front of the collimator lens to receive the collimated beam of light. The polarization converter includes a prismatic film having a first prismatic surface, a reflective polarization film, and a quarter wave retarder film positioned between the prismatic film and the polarization film sheet. The prismatic surface has alternating transmissive prismatic facets and reflective prismatic facets positioned at supplementary base angles, the reflective prismatic facets positioned at a second base angle .beta. and the transmissive prismatic facets positioned at a first base angle generally equal to 180.degree.-.beta..

대표청구항 ▼

[ What is claimed is:] [1.] A planar polarization converter for polarizing a beam of light, the order of incidence along the optical path of the beam of light defining front and back positions, the polarization converter comprising:a prismatic film having a first prismatic surface, the first prismat

[ What is claimed is:] [1.] A planar polarization converter for polarizing a beam of light, the order of incidence along the optical path of the beam of light defining front and back positions, the polarization converter comprising:a prismatic film having a first prismatic surface, the first prismatic surface having alternating transmissive prismatic facets and reflective prismatic facets positioned at supplementary base angles, the reflective prismatic facets positioned at a second base angle .beta. and the transmissive prismatic facets positioned at a first base angle generally equal to 180.degree.-.beta.;a quarter wave retarder film; anda reflective polarization film, wherein the quarter wave retarder film is positioned between the prismatic film and the polarization film sheet.