Switchable window element

A switchable window element with a layer structure comprising a switchable layer, two polarizers and two optical retarders; wherein a first polarizer and a first optical retarder are arranged in an optical path prior to the switchable layer and a second polarizer and a second optical retarder are ar...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Junge, Michael, Beyer, Andreas
Format:	Patent
Sprache:	eng
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 DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL FIXED CONSTRUCTIONS FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES,FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS,BLINDS, GATES FREQUENCY-CHANGING LADDERS 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 switchable window element with a layer structure comprising a switchable layer, two polarizers and two optical retarders; wherein a first polarizer and a first optical retarder are arranged in an optical path prior to the switchable layer and a second polarizer and a second optical retarder are arranged in the optical path after the switchable layer wherein the switchable layer is a vertically aligned liquid crystal layer comprising a liquid crystalline medium and wherein the product of the thickness d of the switchable layer and the optical anisotropy Δn of the liquid crystalline medium is in the range of from 0.05 μm to 3.0 μm and the liquid crystalline medium has a clearing point of at least 70° C.