Display Cell with Compartmentalized Liquid-Crystal Layer, Method for its Production and a Liquid-Crystal Material-Containing Mixture Suitable Therefor
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Abstract
The invention relates to a display cell, comprising two transparent, equidistant plates, wherein the gap between the plates is filled with a liquid-crystal material-containing layer, characterized in that the liquid-crystal material-containing layer is inhomogeneous and anisotropic, wherein it has a first region made up of compartments, which comprise entirely, substantially or mainly liquid-crystal material, and a second, coherent region which comprises entirely, substantially or mainly an organic polymer material and surrounds the compartments made of liquid-crystal material. In addition, the invention relates to a liquid-crystal material-containing mixture which can be used to produce the layer between the plates, and to a method for producing the display cell.
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Citations
48 Claims
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1-23. -23. (canceled)
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24. A display cell comprising:
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a first plate and a second plate that are equidistantly spaced from one another, wherein at least the first plate is light-transparent and wherein an intermediate space is formed between the first and second plates; an inhomogeneous and anisotropic layer disposed in the intermediate space, the layer comprising a liquid crystal material and an organic polymer material, wherein the layer has first regions that are entirely, substantially or mainly comprised of the liquid crystal material and second regions that are entirely, substantially or mainly comprised of the organic polymer material; wherein the first regions are divided into separate compartments and the second regions surround the compartments; wherein the organic polymer material is comprised of a first polymer substance and a second polymer substance, wherein the second regions have first areas containing the first polymer substance and second areas containing the second polymer substance; wherein the second polymer substance has a glass transition temperature that is lower than a glass transition temperature of the first polymer substance; wherein a lateral expansion of the compartments is greater than a thickness of the layer and/or is in a range of 20 μ
m to 100 μ
m, wherein, when the compartments are surrounded by the second polymer substance, the lateral expansion is in a range of 10 μ
m to 100 μ
m. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A mixture comprising:
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a liquid crystal material; an organic polymer material that comprises a first polymer substance with a glass transition temperature of at least 60°
C. and a second polymer substance with a glass transition temperature that is below the glass transition temperature of the first polymer substance;wherein the mixture becomes homogeneous and isotropic upon heating above a clearing point of the liquid crystal material and, upon cooling below the clearing point of the liquid crystal material, separates into first and second regions; wherein the first regions are comprised entirely, substantially or mainly of the liquid crystal material that is anisotropic, wherein the second regions entirely, substantially or mainly are comprised of the organic polymer material, wherein the organic polymer material is present in a proportion of 5% by weight to 30% by weight, relative to a sum of the liquid crystal material and the organic polymer material. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
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45. A method for producing a compartmentalized liquid crystal layer in a display cell, comprising:
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(a) providing a mixture, comprising a liquid crystal material and an organic polymer material that comprises a first polymer substance and a second polymer substance, wherein the second polymer substance has a glass transition temperature that is below a glass transition temperature of the first polymer substance, wherein the mixture becomes homogeneous and isotropic upon heating above a clearing point of the liquid crystal material and, upon cooling below the clearing point of the liquid crystal material, separates into first and second regions, wherein the first regions are comprised entirely, substantially or mainly of the liquid crystal material that is anisotropic, and wherein the second regions entirely, substantially or mainly are comprised of the organic polymer material; (b) heating the mixture to a temperature above the clearing point of the liquid crystal material; (c) filling the mixture into a display cell; and (d) cooling the mixture with a temperature regime that enables separation of the liquid crystal material and the organic polymer material, wherein cooling is carried out so slowly that the first regions of the liquid crystal material obtain a lateral expansion of 10 μ
m-100 μ
m. - View Dependent Claims (46, 47, 48)
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Specification