LICHTVENTIL MIT POSITIVEM, DIELEKTRISCHEM ANISOTROPEM FLÜSSIGKRISTALL UND STARK GEGEN DIE SENKRECHTE GENEIGTE OBERFLÄCHENAUSRICHTUNG UND DAMIT VERBUNDENES VERFAHREN

LICHTVENTIL MIT POSITIVEM, DIELEKTRISCHEM ANISOTROPEM FLÜSSIGKRISTALL UND STARK GEGEN DIE SENKRECHTE GENEIGTE OBERFLÄCHENAUSRICHTUNG UND DAMIT VERBUNDENES VERFAHREN

A liquid crystal cell useful in light valves is disclosed in which positive anisotropy liquid crystals are installed at an initial off-perpendicular alignment within the approximate range of 6 DEG -45 DEG . A light valve employing the cell is initially biased to a voltage approximately corresponding...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: LACKNER, ANNA, M., LOS ANGELES, CA 90024, US, MARGERUM, JOHN, D., WOODLAND HILLS, CA 91367, US
Format: Patent
Sprache:ger
Schlagworte:
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
FREQUENCY-CHANGING
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:A liquid crystal cell useful in light valves is disclosed in which positive anisotropy liquid crystals are installed at an initial off-perpendicular alignment within the approximate range of 6 DEG -45 DEG . A light valve employing the cell is initially biased to a voltage approximately corresponding to a transmissivity peak; the selection of the exact bias voltage involves a trade-off between contrast and response speed. The cell surfaces are characterized by generally flat macrostructures and tilted surface microstructures, with an overcoat on the surfaces of a long chain alcohol with alkoxy groups derived therefrom bonded to the tilted surface microstructure. The alcohol molecules have the formula ROH, where R is a carbon chain having at least six carbon atoms therein.