Display device

A display comprises a permanently reflective layer 3 and a switchable layer 4 which may be switched between a reflective and a transmissive condition. The system is illuminated by one or more light emitters positioned behind the layers. Polarised radiation 1a from the emitters undergoes multiple ref...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	NIALL ANTHONY GALLEN, MICHAEL ANTHONY HANDS
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 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 display comprises a permanently reflective layer 3 and a switchable layer 4 which may be switched between a reflective and a transmissive condition. The system is illuminated by one or more light emitters positioned behind the layers. Polarised radiation 1a from the emitters undergoes multiple reflections between the layers 3 and 4 until such time as it arrives at a position in the switchable layer 4 which has been set to the transmissive state or a gap in the reflective layer 3. Preferably the incident light is circularly polarised, the permanently reflective layer is cholesteric and the switchable layer a cholesteric liquid crystal.