Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1998-10-09
2000-09-19
Dudek, James A.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349113, 349119, 349100, 349 18, 349 5, G02F 11335
Patent
active
061220280
ABSTRACT:
A reflective liquid crystal device includes a polarising beam splitter, a polarisation preserving reflector and a retarder arrangement including at least two retarders. A first of the retarders is disposed between the beam splitter and the reflector, and a second of the retarders is disposed between the first retarder and the reflector, and at least one of the first and second retarder including a liquid crystal layer which is switchable between a dark device state and a bright device state. In the dark state, the retarder arrangement rotates the plane of polarisation of plane-polarised light directed by the beam splitter towards the reflector by substantially n.times.180.degree., where n is an integer, and in a bright device state the first retarder has a retardation of substantially .lambda./2 and the second retarder has a retardation of substantially .lambda./4.
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Gilmour Sandra
Tillin Martin David
Towler Michael John
Chowdhury Tarifur R.
Dudek James A.
Sharp Kabushiki Kaisha
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