RAPID SWITCHING CHOLESTERIC LIQUID CRYSTAL BASED FIELD SEQUENTIAL COLOUR (FSC) ILLUMINATION TYPE LCD

A rapid switching, low response time cholesteric active matrix liquid crystal device suitable for field sequential colour (FSC) illumination (also called colour sequential illumination) is disclosed. RGB LED light sources (9) in the backlight are switched in conjunction with the liquid crystal layer...

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Bibliographische Detailangaben
Hauptverfasser:	ELSTON, STEPHEN, JOHN, STROMER, JAN, FRANK, RAYNES, EDWARD, PETER
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADVERTISING ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION 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 EDUCATION FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS SEALS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	A rapid switching, low response time cholesteric active matrix liquid crystal device suitable for field sequential colour (FSC) illumination (also called colour sequential illumination) is disclosed. RGB LED light sources (9) in the backlight are switched in conjunction with the liquid crystal layer (4) to provide a colour display without colour filters. Alternatively a white! source can be used with colour filters. The liquid crystal layer is arranged between crossed! polarisers (5, 7). The arrangement blocks light in the homeotropic state (21). A display transmission state results on switching the layer from the homeotropic into at least one of a transient planar state (25), an unaligned planar state (27) and an aligned planar state (29). Driving schemes for achieving different grey scale and colour values are disclosed. La présente invention concerne un dispositif à cristaux liquides (1) comportant un boîtier muni d'une couche de matériau à cristaux liquides (4), un moyen d'émission de lumière, et un moyen de commande servant à la commande du moyen d'émission de lumière et du matériau à cristaux liquides (4) dans un mode de transmission de lumière selon lequel le moyen d'émission de lumière est activé de manière sélective et une partie sélectionnée de la couche de matériau à cristaux liquides (4) est commutée entre un état homéotrope et au moins un état plat transitoire, un état plat non aligné et un état plat aligné de sorte que la lumière soit transmise de manière sélective depuis le moyen d'émission de lumière à travers la couche de matériau à cristaux liquides (4).