Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1998-05-15
1999-11-16
Ben, Loha
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359256, 359637, 359494, 349 5, 349 8, 349 9, 353 31, 353 33, G02B 2714
Patent
active
059868155
ABSTRACT:
Methods and apparatus for enhancing the performance of reflective LCD systems. The high-contrast color-splitting prism system utilizes a "double-pass" prism assembly. Polarized light enters the prism assembly, is color-split and is emitted as separate colors to reflective imagers which reflect each color in accord with a desired image. The reflected light is passed, once again, through the prism assembly where the separate colors converge and the convergent light is emitted to a projection lens for display of the image on a screen. At least one zero-incidence waveplate compensator is positioned between one reflective imager and the prism assembly. The waveplate compensator effectively decreases the unwanted polarized light entering the prism assembly for the second pass-through, thereby increases the polarization purity of the light that is emitted from the prism assembly to the projection lens to yield a high-contrast projection image.
REFERENCES:
patent: 4408839 (1983-10-01), Wiener-Avnear
patent: 4583825 (1986-04-01), Buzak
patent: 5005952 (1991-04-01), Clark et al.
patent: 5044732 (1991-09-01), Kimura et al.
patent: 5115305 (1992-05-01), Baur et al.
patent: 5124818 (1992-06-01), Conner et al.
patent: 5124841 (1992-06-01), Oishi
patent: 5130826 (1992-07-01), Takanashi et al.
patent: 5134507 (1992-07-01), Ishii
patent: 5150237 (1992-09-01), Iimura et al.
patent: 5157523 (1992-10-01), Yamagishi et al.
patent: 5184237 (1993-02-01), Iimura et al.
patent: 5231522 (1993-07-01), Sumiyoshi
patent: 5245451 (1993-09-01), Wu et al.
patent: 5250214 (1993-10-01), Kanemoto et al.
patent: 5251068 (1993-10-01), Oshima et al.
patent: 5264951 (1993-11-01), Takanashi et al.
patent: 5267029 (1993-11-01), Kurematsu et al.
patent: 5270804 (1993-12-01), Lach
patent: 5285268 (1994-02-01), Nakagaki et al.
patent: 5305146 (1994-04-01), Nakagaki et al.
patent: 5325137 (1994-06-01), Konno et al.
patent: 5327270 (1994-07-01), Miyatake
patent: 5347382 (1994-09-01), Rumbaugh
patent: 5379135 (1995-01-01), Nakagaki et al.
patent: 5380459 (1995-01-01), Kanemoto et al.
patent: 5387991 (1995-02-01), Mitsutake et al.
patent: 5398081 (1995-03-01), Jones
patent: 5400179 (1995-03-01), Ito
patent: 5440414 (1995-08-01), Kersey et al.
patent: 5453859 (1995-09-01), Sannohe et al.
patent: 5459593 (1995-10-01), Ootaki
patent: 5462621 (1995-10-01), Ishii
patent: 5576854 (1996-11-01), Schmidt et al.
patent: 5579138 (1996-11-01), Sannohe et al.
patent: 5579159 (1996-11-01), Ito
patent: 5594591 (1997-01-01), Yamamoto et al.
patent: 5621486 (1997-04-01), Doany et al.
patent: 5625491 (1997-04-01), von Gunten et al.
patent: 5644432 (1997-07-01), Doany
patent: 5658060 (1997-08-01), Dove
patent: 5676854 (1997-10-01), Inui et al.
patent: 5777789 (1998-07-01), Chiu et al.
patent: 5777796 (1998-07-01), Burstyn
Ben Loha
Optical Coating Laboratory, Inc.
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