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EP0506176A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Light-scattering element

Assignee: Koninklijke Philips NV
•
Filing: 1992-03-17
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Granted: —
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Expires: 2012-03-17
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Abstract

Abstract A light-scattering element comprising a liquid-crystalline material which is dispersed in a matrix of a transparent polymer material is manufactured by mixing at least one reactive liquid-crystalline material and at least one non-reactive liquid-crystalline material. The mixture is provided between two substrates 1 and 2 in the form of a thin layer 5, rubbed polymer layers 3 and 4 being present on the side of the substrates where the mixture is to be provided, as a result of which the molecules in the mixture are oriented. The reactive material is made to cure by means of actinic radiation thereby forming a polymer network in which the non-reactive material is present as a continuous phase. The difference between one of the refractive indices of the cured material and the corresponding refractive index of the non-reactive liquid-crystalline material is less than 0.10, as a result of which the light-scattering element forms a simple polarizer.

Inventors

  • 👤 Rifat Ata Mustafa Hikmet

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-29 14:43
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/542; C09K19/544; G; G02; G02B; G02B5/00; G02B5/30; G02B5/3008; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1334; C09K2019/546; G02F1/13345

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 64 words
A light-scattering element comprising a liquid-crystalline material which is dispersed in a matrix of a transparent polymer material, characterized in that the matrix consists of a uniaxially oriented material, the difference between one of the refractive indices of the matrix material and the corresponding refractive index of the dispersed material being less than 0.10, measured at the wavelength at which the element is used.
Claim 2
Dependent Claim 51 words
A light-scattering element as claimed in Claim 1, in which the difference between the ordinary refractive indices of the matrix material and the dispersed material is less than 0.05 and the difference between the extraordinary refractive indices is more than 0.10, measured at the wavelength at which the element is used.
Claim 3
Dependent Claim 17 words
A light-scattering element as claimed in Claim 1, in which the matrix material forms a polymer network.
Claim 4
Dependent Claim 22 words
The use of a light-scattering element as claimed in one of the Claims 1 up to and including 3 as a polarizer.
Claim 5
Independent Claim 106 words
A method of manufacturing a light-scattering element comprising a liquid-crystalline material which is dispersed in a matrix of a transparent polymer material, characterized in that at least one reactive liquid-crystalline material and at least one non-reactive liquid-crystalline material are mixed, after which the molecules in the mixture are oriented and the reactive material is made to cure by means of actinic radiation thereby forming a polymer network in which the non-reactive material is dispersed, curing being carried out at a temperature such that one of the refractive indices of the cured material differs less than 0.10 from the corresponding refractive index of the non-reactive liquid-crystalline material.
Claim 6
Dependent Claim 44 words
A method as claimed in Claim 5, in which the molecules are oriented by providing the mixture in the form of a thin layer between two substrates on which rubbed polymer layers are present on the side where the mixture is to be provided.

References Cited (Backward Citations)

WO1985004262A1 Cited
WO1987001822A1 Cited
EP0272585A2 Cited
WO1989009807A1 Cited
EP0409442A2 Cited

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