Liquid crystal cells – elements and systems – Particular structure – Interconnection of plural cells in series
Patent
1996-10-22
1998-01-13
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Interconnection of plural cells in series
349117, G02F 11347, G02F 11335
Patent
active
057084882
ABSTRACT:
Phase-type spatial modulation of light is achieved by placing a twisted pneumatic liquid crystal cell between two polarizers, such that a direction of alignment of liquid crystal molecules at an input side of the liquid crystal cell is parallel to a transmission access of a first one of the polarizers, and such that a direction of alignment liquid crystal molecules at an output side of the liquid crystal cell is parallel to a transmission access of a second one of the polarizers. Also, phase modulation which is substantially free from amplitude variations can be realized by placing two twisted pneumatic liquid crystal cells between two polarizers. In such an arrangement, a direction of alignment of the liquid crystal molecules at an input side of a first liquid crystal cell is parallel to a transmission access of a first polarizer, and a direction of alignment of liquid crystal molecules at an output side of the first liquid crystal cell is perpendicular to a direction of alignment of the liquid crystal molecules at an input side of the second liquid crystal cell. The direction of alignment of the liquid crystal molecules of the second liquid crystal cell is perpendicular to a transmission access of the second polarizer. The two liquid crystal cells have identical drive voltages applied thereto, and have identical retardations and twist angles. However, the twist angle of the first liquid crystal cell is in an opposite direction to that of the second liquid crystal cell.
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Fukui Atsushi
Ito Masami
Nishii Kanji
Matsushita Electric - Industrial Co., Ltd.
Miller Charles
Sikes William L.
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