EP0451905A1
Expired / Lapsed
EP
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Liquid crystalline material and display cell containing said material
Assignee: Koninklijke Philips NV
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Filing: 1991-04-03
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Granted: —
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Expires: 2011-04-03
Abstract
Abstract A liquid crystalline material in the form of an anisotropic gel comprising a polymerized liquid crystalline material and a low-molecular liquid crystalline material, can be used in a display cell, said polymerized material forming a permanently oriented network in the low-molecular liquid crystalline material. The display cell comprises two opposite plates 1 and 2 which are transparent to light as the substrate, which plates are provided with electrodes 4 and 5 of a material which is transparent to light on the sides facing each other, orientation layers 7 being provided on said electrodes. A sealing material 3 is provided between the ends of the plates 1 and 2. The space between the plates and the sealing material is filled with the liquid crystalline material 6.
Inventors
- 👤 Rifat Ata Mustafa Hikmet
- 👤 Dirk Jan Broer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 06:39
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/52; C09K19/54; C09K19/542; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1334; G02F1/13345
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
43 words
A liquid crystalline material in the form of an anisotropic gel consisting of a polymerized liquid crystalline material and a low-molecular liquid crystalline material, characterized in that the polymerized material a) forms a permenantly oriented network in the low-molecular liquid crystalline material b).
Claim 2
Dependent Claim
24 words
A liquid crystalline material as claimed in Claim 1, characterized in that material b) forms a continuous phase around the network of material a).
Claim 3
Dependent Claim
26 words
A liquid crystalline material as claimed in Claim 1, characterized in that material a) is selected from acrylates, epoxy compounds, vinyl ether compounds and thiolene compounds.
Claim 4
Dependent Claim
65 words
A liquid crystalline material as claimed in Claim 3, characterized in that the acrylate corresponds to formula 1, shown on the formula sheet, where A is a group denoting a bonding dash, -O- or - COO-, B is a mesogenic group examples of which are indicated by formulae 9-12, as shown on the formula sheet, and m and n are integers between 0 and 20.
Claim 5
Dependent Claim
67 words
A liquid crystalline material as claimed in Claim 3, characterized in that the epoxy compound corresponds to formula 3, shown on the formula sheet, where X corresponds to a group represented by formulae 4-8, shown on the formula sheet, B is a mesogenic group examples of which are indicated by formulae 9-12, shown on the formula sheet, and p is an integer having a value of 0-20.
Claim 6
Dependent Claim
41 words
A liquid crystalline material as claimed in Claim 3, characterized in that the material a) is a vinyl ether of formula 13, as shown on the formula sheet, and B and X have the same meaning as indicated in Claim 5.
Claim 7
Dependent Claim
27 words
A liquid crystalline material as claimed in Claims 1-6, characterized in that material a) is present in the gel in a quantity of 1-50 % by weight.
Claim 8
Dependent Claim
28 words
A liquid crystalline material as claimed in Claim 7, characterized in that the material a) is present in the gel in a quantity of 3-10 % by weight.
Claim 9
Dependent Claim
19 words
A liquid crystalline material as claimed in Claims 1-8, characterized in that substance b) is a non-polymerizable crystalline material.
Claim 10
Dependent Claim
27 words
A liquid crystalline material as claimed in Claims 1-8, characterized in that under the conditions of cross-linking substance a), substance b) is a non-polymerizable liquid crystalline material.
Claim 11
Dependent Claim
33 words
A liquid crystalline material as claimed in Claim 9, characterized in that substance b) is selected from the group of compounds represented by formulae 15-18 on the formula sheet, or a mixture thereof.
Claim 12
Dependent Claim
22 words
A liquid crystalline material as claimed in one of the preceding Claims, characterized in that the permanently oriented network is helically shaped.
Claim 13
Dependent Claim
92 words
A display cell comprising two opposite plates which are transparent to light as the substrate, which plates are provided with an electrode of a material which is transparent to light on the sides facing each other, said electrode carrying an orientation layer and a sealing material being provided between the ends of the plates, a liquid crystalline material being introduced in the space between the plates and the sealing material, characterized in that the liquid crystalline material is composed of at least two different liquid crystalline materials, as indicated in Claims 1-12.
References Cited (Backward Citations)
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