Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Optical excitation
Patent
2000-02-19
2000-11-07
Sikes, William L.
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Optical excitation
349 9, 349 96, 349100, 349117, G02F 1135, G02F 11335
Patent
active
061444219
ABSTRACT:
A reflection mode, ferroelectric liquid crystal spatial light modulating system, includes a light reflecting type spatial light modulator. The spatial light modulator has a light reflecting surface cooperating with a layer of ferroelectric liquid crystal light modulating medium switchable between first and second states so as to act on light in different first and second ways, respectively. A switching arrangement switches the liquid crystal light modulating medium between the first and second states and an illumination arrangement produces a source of light. An optics arrangement is optically coupled the spatial light modulator and the illumination arrangement such that light is directed from the source of light into the spatial light modulator for reflection back out of the modulator and such that reflected light is directed from the spatial light modulator into a predetermined viewing area. The optics arrangement includes a passive quarter wave plate positioned in the optical path between the light source and the spatial light modulator and in the optical path between the spatial light modulator and the viewing area. A compensator cell is also positioned in the optical path between the light source and the spatial light modulator and in the optical path between the spatial light modulator and the viewing area. The compensator cell has a layer of ferroelectric liquid crystal light modulating medium switchable between a primary and a secondary state so as to act on light in different primary and secondary ways, respectively.
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Beyer Jay R
Chowdhury Tarifur R.
Displaytech, Inc.
Shear Stephen C.
Sikes William L.
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