LIQUID CRYSTAL DEVICES

The device comprises a layer of long-pitch cholesteric liquid crystal material of positive dielectric anisotropy. An amount of pleochroic dye is contained between two cell walls bearing electrodes and being surface treated to align liquid crystal molecules in a tilted homogeneous structure. The surf...

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Bibliographische Detailangaben
Hauptverfasser:	COLIN MARTIN WATERS, EDWARD PETER RAYNES
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES ADVERTISING ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION CHEMISTRY CRYPTOGRAPHY DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING DISPLAY DYES EDUCATION FREQUENCY-CHANGING MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PAINTS PHYSICS POLISHES SEALS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	The device comprises a layer of long-pitch cholesteric liquid crystal material of positive dielectric anisotropy. An amount of pleochroic dye is contained between two cell walls bearing electrodes and being surface treated to align liquid crystal molecules in a tilted homogeneous structure. The surface alignment and natural pitch of the cholesteric material are matched to provide a molecular twist of between pi and 2pi radians across the layer with a uniform tilt direction. The ratio of layer thickness d divided by pitch p lies between 0.5 and 1.0, d being less than 20 microns. The device may be switched directly between a light transmissive ON state and a non-transmissive OFF state. The device has a sharp transmission/voltage characteristic and negligible hysterisis.