Optical system for illuminating a light valve

Details Optical system for illuminating a light valve Optical system for illuminating a light valve

1991-02-14

1992-05-05

Heyman, John S.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 64, 359496, 353 20, 353122, G02F 1133, G03B 2114, G02B 2728

Patent

active

051113155

ABSTRACT:
A color sequential illumination system (10) for a single light valve full-color projector is disclosed herein. The inventive color sequential system (10) is operative to illuminate a light valve (28) in response to an input beam. A prepolarizer arrangement (11, 13) polarizes optical energy of a first band of wavelengths within the input beam in a first state, and polarizes optical energy of a second band of wavelengths within the input beam in a second state. The system (10) includes a first liquid crystal switch (14), in optical alignment with the prepolarizer arrangement (11, 13), for selectively rotating the polarization states of optical energy within the first and second wavelength bands. A polarizer filter (18, 20), in optical alignment with the first liquid crystal switch (14), filters optical energy within the second wavelength band polarized in the predetermined state. A second liquid crystal switch (16), in optical alignment with the polarizer filter (18 20), selectively rotates the polarization states of optical energy within the first and second wavelength bands. The inventive system (10) also includes a broadband polarizer (24), in optical alignment with the second liquid crystal switch (16), for directing optical energy polarized in a predetermined state to the light valve (28).

REFERENCES:
patent: 4425028 (1984-01-01), Gagnon et al.
patent: 4715684 (1987-12-01), Gagnon
patent: 4824214 (1989-04-01), Ledebuhr
patent: 4842374 (1989-06-01), Ledebuhr
patent: 4913529 (1990-04-01), Goldenberg et al.
patent: 4989076 (1991-01-01), Owada et al.

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