Projection display device

Details Projection display device Projection display device

2011-06-21

2011-06-21

Epps, Georgia Y (Department: 2878)

Optics: image projectors

Polarizer or interference filter

C353S034000, C348S752000, C348S762000, C348S767000, C349S080000, C349S096000, C349S194000

Reexamination Certificate

active

07963657

ABSTRACT:
An imager is shifted with respect to an optical axis of a refractive optical system. Thereby, a throw distance of a projector is shortened. A wavelength-selective half wavelength plate for rotating a polarization direction of green light beams is disposed between a dichroic prism and the refractive optical system in such a manner that the polarization direction of the green light beams is in parallel to the shifting direction. Thereby, the green light beams are incident onto the refractive optical system as P-polarized beams, whereby a transmittance of the green light beams in the refractive optical system is increased, while suppressing lowering of the light amount of the green light beams, and color non-uniformity resulting from lowering of the light amount of the green light beams.

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Abstract translation of JP 01-126678 A.

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