Reflective liquid crystal spatial light modulator and projection

Details Reflective liquid crystal spatial light modulator and projection Reflective liquid crystal spatial light modulator and projection

1996-06-24

1999-09-07

Sikes, William L.

Liquid crystal cells, elements and systems

Particular excitation of liquid crystal

Electrical excitation of liquid crystal

349201, 349 86, 349 10, 353 37, 353 38, 353 97, 353122, G02F 1136

Patent

active

059495030

ABSTRACT:
Reflective spatial light modulators (RSLMs) and projection apparatus employing such RSLMs are disclosed. The RSLM comprises a reflective surface and a superposed light-modulation layer. The reflective surface is configured to have a reflective diffraction optical element or a microfaceted reflective array. Incident light impinging on the RSLM can pass through the light-modulation layer, reflect from the reflective surface, and return through the light-modulation layer to become modulated signal light capable of forming a viewable image if projected onto a screen or other surface. The reflective diffraction optical element or microfaceted reflective array on the reflective surface is operable to cause the signal light to propagate from the RSLM in a different direction than any ghost light reflected from the RSLM. Projection apparatus employing such an RSLM comprise an illumination optical system, a projection optical system that may or may not be coaxial with the illumination optical system, and a stop operable to pass signal light but not ghost light to a screen for viewing. The viewed image has enhanced contrast over the prior art.

REFERENCES:
patent: 4251137 (1981-02-01), Knop et al.
patent: 4389096 (1983-06-01), Hori et al.
patent: 4729640 (1988-03-01), Sakata
patent: 5299289 (1994-03-01), Omae et al.
patent: 5477351 (1995-12-01), Takahara et al.

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