Optics: image projectors – Composite projected image – Plural projection paths with single light source
Patent
1996-01-23
1997-08-05
Dowling, William
Optics: image projectors
Composite projected image
Plural projection paths with single light source
353 33, 353 20, 349 61, G03B 2128
Patent
active
056535201
ABSTRACT:
A liquid crystal display (LCD) projector capable of converting a luminous flux from a light source lamp into a linear polarized beam at high efficiency and providing high-brightness high-uniformity images whose illuminance is uniform all over the projection screen is realized. A luminous flux emitted from a light source lamp 101 comes incident on first through fourth polarization beam-splitter prisms (PBSPs) 104 through 107, and part of the flux is transmitted by the PBSPs as it is and reaches an liquid crystal display (LCD) panel 119 while another part is reflected by the polarization beam-splitting planes of the PBSPs, reflected by first through fourth luminous flux reflecting elements 108 through 111, transmitted by first through fourth 1/2 retardation plates 113 through 116, and reaches the LCD panel 119. As the latter reinforces the light beams in four peripheral areas of the LCD panel 119, the images projected on the screen through a projection lens, not shown, have high brightness and are uniform in illuminance.
REFERENCES:
patent: 5124841 (1992-06-01), Oishi
patent: 5272496 (1993-12-01), Nicolas et al.
patent: 5283600 (1994-02-01), Imai
patent: 5381250 (1995-01-01), Meadows
patent: 5381278 (1995-01-01), Shingaki et al.
patent: 5387953 (1995-02-01), Minoura et al.
patent: 5387991 (1995-02-01), Mitsutake et al.
patent: 5446510 (1995-08-01), Mitsutake et al.
patent: 5452128 (1995-09-01), Kimura
patent: 5461500 (1995-10-01), Tsuji et al.
Dowling William
NEC Corporation
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