Switchable cholesteric filter and luminaire having such a filter

Details Switchable cholesteric filter and luminaire having such a filter Switchable cholesteric filter and luminaire having such a filter

1996-06-14

1998-06-09

Kelly, C. H.

Compositions

Liquid crystal compositions

349 13, C09K 1952, G02F 113

Patent

active

057628238

ABSTRACT:
The invention relates to a switchable cholesteric filter. Said filter comprises an optically active layer which is situated between two substrates which are both provided with an electrode for applying an electric field. The optically active layer comprises a liquid-crystalline material which is in the cholesteric phase. In accordance with the invention, the optically active layer comprises a three-dimensional polymer network which consists of the polymerization product of maximally 2 wt. % of monomers with at least two polymerizable groups and maximally 30 wt. % of liquid-crystalline monomers with one polymerizable group, and the rest of the optically active layer consists predominantly of a mixture of chiral and achiral liquid-crystalline molecules. An optically active layer of this composition can be switched in a simple and reproducible manner by means of an electric field. The invention also relates to a luminaire comprising such a switchable cholesteric filter.

REFERENCES:
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patent: 5251048 (1993-10-01), Doane et al.
patent: 5257127 (1993-10-01), Hikmet
patent: 5282121 (1994-01-01), Bornhorst et al.
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patent: 5323251 (1994-06-01), Coates et al.
patent: 5342545 (1994-08-01), Yamada et al.
patent: 5354498 (1994-10-01), Akashi et al.
patent: 5356557 (1994-10-01), Jubb et al.
patent: 5374371 (1994-12-01), Takeuchi et al.

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