Micro display projection system

Details Micro display projection system Micro display projection system

2007-03-13

2007-03-13

Koval, Melissa Jan (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S030000, C353S039000

Reexamination Certificate

active

10995526

ABSTRACT:
Disclosed is a reflection-type micro display projection system having a polarization beam splitter with an optimized structure. The reflection-type micro display projection system includes a light source, an optical system, a reflection-type liquid crystal display panel, a projection lens, and a screen. When the incident angle of the light beam, which is output from an illumination lens of the optical system and input to a polarization beam splitter on the basis of the normal of the boundary face of the polarization beam splitter, is α, the refractive angle of the light beam refracted inside the polarization beam splitter is β, and the refractive index of the polarization beam splitter is n, n×sin β=sin α. The refractive index n is larger than 1.6 and smaller than 2.0. The refractive angle β is smaller than 75°.

REFERENCES:
patent: 2002/0176146 (2002-11-01), De Vaan
patent: 2003/0016334 (2003-01-01), Weber et al.

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