Projector using a small-size optical system

Details Projector using a small-size optical system Projector using a small-size optical system

1996-12-19

1998-12-29

Dowling, William

Optics: image projectors

Polarizer or interference filter

353 98, 353 69, 359631, 349 8, G03B 2114

Patent

active

058532404

ABSTRACT:
A small and light liquid-crystal projector, a projector making a combination with a head-mounted display and a small-and-light projector device for projecting an image or three-dimensional image from the HMD onto a common screen: the HMD has, in its casing, an optical device for enlarging an image of a liquid-crystal panel illuminated by a back light, which device comprising a reflection type refracting element with a half-mirror coat and a cholesteric liquid crystal element acting as circularly-polarized-light selecting semitransparent mirror; a base unit with which the HMD is connected to form a projector device has, in its housing, an optical correcting portion, a projector back-light, a light-source changing portion and a mechanism for inserting the optical correcting portion for correcting the curvature of a projectable image; when assembling the HMD with the base unit, the light-source changing portion acts so as to illuminate the liquid crystal panel with intensive back-light though a parabolic mirror and, at the same time, the optical correcting portion is inserted into a optical path.

REFERENCES:
patent: 5050966 (1991-09-01), Berman
patent: 5408346 (1995-04-01), Trissel
patent: 5573324 (1996-11-01), DeVaan
patent: 5601351 (1997-02-01), van der Brandt
patent: 5626408 (1997-05-01), Heynderickx et al.

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