Liquid crystal projector including a polaration rotating element

Details Liquid crystal projector including a polaration rotating element Liquid crystal projector including a polaration rotating element

1991-11-08

1994-03-29

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

353 33, 353 34, 359 41, 359 63, G03B 2100, G03B 2126, G02F 11335

Patent

active

052990362

ABSTRACT:
Disclosed is an image projector of the type in which an LCD matrix screen is illuminated by two polarized beams after 90.degree. rotation of the direction of polarization of one of these two beams. Each of the two polarized beams is reflected at least once towards an optical axis on which the matrix screen is centered and at least once again towards the matrix screen. Furthermore, the image projector has means to make each beam polarized, so that each polarized beam forms an image of the light source before illuminating the matrix screen. The two polarized beams may thus be oriented towards the matrix screen in forming a small angle with one another, thus enabling the use of a projection objective with a small aperture.

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Patent Abstracts of Japan, vol. 10, No. 268 (E-436), Sep. 12, 1986, JP-A-61 090 584, Aug. 5, 1986, H. Masami, "Projection-Type Display Device".
Patent Abstracts of Japan, vol. 12, No. 461 (E-689) (3308), Dec. 5, 1988, of JP-A-63 182 987, Jul. 28, 1988, M. Tajima, "Light Polarizing Element for Liquid Crystal Display Projector".
Patent Abstracts of Japan, vol. 10, No. 308 (P-508) (2364), Oct. 21, 1986, of JP-1-61 122 626, Jun. 10, 1986, M. Himuro, "Polarized Light Illuminating Device".

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