Liquid crystal cells – elements and systems – Particular structure – Interconnection of plural cells in series
Patent
1997-05-16
2000-10-10
Parker, Kenneth
Liquid crystal cells, elements and systems
Particular structure
Interconnection of plural cells in series
349100, 349117, 349106, 349196, 349 57, 349172, G02F 1141, G02F 11347, G02F 11335
Patent
active
061307319
ABSTRACT:
A device for influencing light has a polarizer, a ferroelectric or electroclinic response type liquid crystal halfwave plate whose liquid crystals are in the smectic phase with bookshelf geometry and have molecular axes which are rotatable around a first direction corresponding to the direction of incoming light in response to an electric field applied across the electrodes on either side of the halfwave plate, a quarter wave retarder plate, and a mirror. The polarizer, plates and mirror are arranged such that incoming light is passed from the polarizer through the liquid crystal plate and the retarder plate, and is reflected by the mirror in a second direction opposite to the first direction back through the retarder and the liquid crystal plate so as to provide a reflected polarized light plane to the polarizer. The polarizer has a first polarization direction set parallel to one electrically selectable molecular axis direction of the liquid crystal molecules, which is selected in response to a first electric field level. The retarder plate has its slow axis inclined either 45.degree. or 135.degree. relative to the optic axis of the liquid crystal. The liquid crystal, furthermore, is of a material which produces an angular difference 2.theta. in optic axis direction in response to a second electric field level whose polarity is opposite that of the first electric field level. This allows the device to rotate the reflected polarized light plane by an angle of 8.theta. in response to the second electric field level.
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Andersson Gunnar
Dahl Ingolf
Komitov Lachezar
Lagerwall Sven Torbjorn
Skarp Kent
Duong Tai V.
Parker Kenneth
S.T. Lagerwall S.A.R.L.
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