Patent
1987-06-08
1988-08-30
Miller, Stanley D.
350331T, 350347V, 350348, G02F 1137
Patent
active
047671947
ABSTRACT:
An optical system contains a liquid crystal cell (1), to the liquid crystal layer (11) of which an E-field can be applied transversely to the plane of the layer. A light source (3) sends to the liquid crystal cell (1) a beam of rays parallel to the field direction. The liquid crystal is in the form of a chiral, optically isotropic phase ("blue phase"). This phase has a field-dependent optical density for the incident light and is matched to the light wavelength such that no selective reflection takes place. Such a cell is also optically isotropic in the presence of an E-field, switches rapidly and requires no interface orientation. Its preferred fields of use are: intensity modulation of light of a given wavelength, or as a phase grid in a schlieren-optical system, an etalon in a laser, or a light switch.
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V. A. Belyakov and V. E. Dmitrienko, "The Blue Phase of Liquid Crystals," Sov. Phys. Usp. 28(7), Jul. 1985, pp. 535-562.
Heppke Gerd
Kitzerow Heinz-Siegfried
Krumrey Michael
Oestreicher Feodor
Lewis David
Merck Patent Gesellschaft mit beschrankter Haftung
Miller Stanley D.
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