Polarized light illumination device and projection display devic

Details Polarized light illumination device and projection display devic Polarized light illumination device and projection display devic

1999-02-17

2000-03-28

Metjahic, Safet

Optics: image projectors

Polarizer or interference filter

353 8, 353 31, 353 94, 349 9, G03B 2114, G03B 2100, G02F 11335

Patent

active

060422343

ABSTRACT:
A polarized light illumination device that is able to utilize both polarized light components by using a plurality of light sources without increasing the illumination angle, and a projection display device that is able to project a considerably bright projection image are provided. In a polarized light illumination device, randomly polarized light emitted from first and second light sources is directionally separated into two types of polarized light by a polarized light separating and synthesizing optical element, secondary light-source images, which are offset in the x direction, are formed, and then, the direction of polarization is aligned. In this case, at least two of first to third light-collecting mirror plates are shifted in parallel from about the center axis of the polarized light separating and synthesizing optical element so that secondary light-source images of s-polarized light in emitting light from the first and second light sources overlap each other, and so that secondary light-source images of p-polarized light overlap each other.

REFERENCES:
patent: 5295018 (1994-03-01), Konuma et al.
patent: 5446510 (1995-08-01), Mitsutake et al.
patent: 5765934 (1998-06-01), Okamori et al.

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