Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1997-11-28
2000-10-31
Parker, Kenneth
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349171, G02F 1141
Patent
active
061410764
ABSTRACT:
A hybrid analog/binary electro-optic modulator using a twisted ferroelectric liquid crystal structure is provided. Ferroelectric liquid crystals with a tilt angle of between about 20.degree. and about 25.degree., preferably about 22.5.degree. are used. Rubbing directions for the two cell walls (relative to one another) can be varied from about 45.degree. to about 90.degree.. In one embodiment, a weak buffing force is used resulting in a relatively weak anchoring energy at the surface, aligning the liquid crystal molecules without locking the molecules into the buffing directions and a high pre-tilt structure for the molecules close to the surface boundaries. In one embodiment, strong buffing is used with buffing directions offset about 45.degree.. Use of this invention provides relatively fast response time, low required driving voltage, high contrast, and/or the ability to achieve both analog and binary operations.
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Liu Jian-Yu
Wong Seng-Ieong
Wu Kuang-Yi
Chorum Technologies Inc.
Parker Kenneth
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