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1. WO1996006380 - LIQUID CRYSTAL DISPLAY DEVICE AND RETARDATION FOIL

Publication Number WO/1996/006380
Publication Date 29.02.1996
International Application No. PCT/IB1995/000644
International Filing Date 14.08.1995
IPC
G02F 1/13363 2006.01
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01for the control of the intensity, phase, polarisation or colour
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333Constructional arrangements
1335Structural association of cells with optical devices, e.g. polarisers or reflectors
13363Birefringent elements, e.g. for optical compensation
CPC
G02F 1/133632
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
01for the control of the intensity, phase, polarisation or colour 
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333Constructional arrangements; ; Manufacturing methods
1335Structural association of cells with optical devices, e.g. polarisers or reflectors
13363Birefringent elements, e.g. for optical compensation
133632with refractive index ellipsoid inclined relative to the LC-layer surface
G02F 1/133636
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
01for the control of the intensity, phase, polarisation or colour 
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333Constructional arrangements; ; Manufacturing methods
1335Structural association of cells with optical devices, e.g. polarisers or reflectors
13363Birefringent elements, e.g. for optical compensation
133636with twisted orientation, e.g. comprising helically oriented LC-molecules or a plurality of twisted birefringent sublayers
Applicants
  • PHILIPS ELECTRONICS N.V. [NL/NL]; Groenewoudseweg 1 NL-5621 BA Eindhoven, NL
  • PHILIPS NORDEN AB [SE/SE]; Kottbygatan 5, Kista S-164 85 Stockholm, SE (SE)
Inventors
  • VAN HAAREN, Johannes, Albertus, Matthijs, Maria; NL
  • BROER, Dirk, Jan; NL
Agents
  • RAAP, Ariaan, Yde; Internationaal Octrooibureau B.V. P.O. Box 220 NL-5600 AE Eindhoven, NL
Priority Data
94202402.723.08.1994EP
95200119.618.01.1995EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) LIQUID CRYSTAL DISPLAY DEVICE AND RETARDATION FOIL
(FR) DISPOSITIF D'AFFICHAGE A CRISTAUX LIQUIDES ET FEUILLE RETARDATRICE
Abstract
(EN)
A liquid crystal display cell is provided with a compensation layer which, viewed transversely to the cell, has a broken (non-rotationally) symmetrical refractive index pattern or indicatrix. To obtain a small angle dependence, the associated birefringence of the compensation layer is complementary to that associated with a given voltage across the liquid crystal cell, so that the optical axis of the compensation layer substantially coincides with the direction of the directors in the driven state. The compensation layer can be manufactured in many different ways by making use of cholesteric foils or foils based on discotic LC materials.
(FR)
Cellule d'affichage à cristaux liquides possédant une couche de compensation qui présente en coupe une indicatrice ou un schéma d'indice de réfraction à symétrie brisée (non rotatoire). Afin d'obtenir une dépendance à petit angle, la biréfringence associée à la couche de compensation est complémentaire de celle associée à une tension donnée traversant la cellule à cristaux liquides, de manière qu'à l'état activé, l'axe optique de la couche de compensation coïncide sensiblement avec l'orientation des directeurs. On peut fabriquer la couche de compensation de différentes façons en utilisant des feuilles cholestériques ou des feuilles à base de cristaux liquides discoïdes.
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