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Browse Prior Art Database

BISTABLE DEFLECTION

IP.com Disclosure Number: IPCOM000022841D
Original Publication Date: 1976-Mar-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 298K

Publishing Venue

Xerox Disclosure Journal

Abstract

A method for selectively reflecting light of a given wave~ length,A , within a layer 4 of nematic liquid crystalline material via creation and manipulation of a parallel variable diffraction mode in the liquid crystalline material,

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XEROX DISCLOSURE JOURNAL

BISTABLE DEFLECTION Proposed Classification
J.M, Pollack U,S, Cl, 350/16OLC

Int, Cl. G02b 5/23

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Volume I Number 3 March 1976 89

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A method for selectively reflecting light of a given wave~
length,A , within a layer 4 of nematic liquid crystalline
material via creation and manipulation of a parallel
variable diffraction mode in the liquid crystalline
material,

An about 1 to about 6 micron thick layer 4 of homogeneously
aligned nematic liquid crystalline material having negative
dielectric anisotropy is contained between two transparent
electrodes 2 and 5. Light of wavelength 1~ is transmitted
through one of the transparent electrodes and impinges the
liquid crystal layer. A D.C. voltage is applied between
the two transparent electrodes and has a magnitude suffi~
cient to cause the creation of closely spaced, vortical
domains X of liquid crystalline material which vortical
domains are in a direction parallel to the initial homo~-
geneous alignment.

Variation of the voltage applied results in selective trans~ mission, For example, an about 3,7 micron thick layer of
the nematic liquid crystalline Phase V available under the
trademark Licristal from E,M, Laboratories, Inc. will assume
the parallel variable grating mode at about 10 volts D.C.
When about 85 or more volts are applied between the two
transparent electrodes total internal reflection of light
at a wavelength of about 6328k occurs, Bel...