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Low viscosity liquid crystal material

A liquid crystal material, low viscosity technology, applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of difficult measurement experiments, unpredictable effects, and difficulties in predicting its performance, so as to achieve the goal of reducing bulk viscosity Effect

Inactive Publication Date: 2000-06-21
KENT DISPLAY SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is impossible to predict what effect additives used to reduce the viscosity of nematic liquid crystals might have in chiral nematic liquid crystal materials
[0005] The crystal structure of chiral nematic materials makes predicting their properties more difficult than nematic materials
Liquid crystal molecules of chiral nematic materials have a helically oriented director, which makes it difficult to perform measurement experiments such as dielectric constant and light transmittance

Method used

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  • Low viscosity liquid crystal material
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Add together the following weight % materials expressed based on the total weight of the composition:

[0111] BL061 74.6%;

[0112] E44 14.9%;

[0113] p-cyanophenylpentane 10.0%;

[0114] C6 0.50%;

[0115] Dye is added to saturate the color. The helical pitch of the cholesteric liquid crystal is adjusted with the E44 nematic material so that the material reflects light at wavelengths in the visible region of the electromagnetic spectrum. These materials were mixed in a vortex mixer for 30 seconds. The mixture was then placed in an oven at 100°C until the entire mixture was in the isotropic phase. The mixture was then mixed in a vortex mixer at room temperature until returning to the cholesteric phase. The time for the second mixing varies with the concentration of the additive and the amount of the mixture.

Embodiment 2

[0117] The following components were added together and kneaded under the same conditions as in Example 1.

[0118] BL061 76.28%;

[0119] E44 16.12%;

[0120] 1-Phenylhexane 7.10%;

[0121] C6 0.50%;

Embodiment 3

[0123] The following components were added together and kneaded under the same conditions as in Example 1.

[0124] BL061 75.4%;

[0125] E44 16.1%;

[0126] p-cyanopentylbenzene 8.00%;

[0127] BAB 1.10%;

[0128] IRGACURE  651 0.30%;

[0129] C6 0.50%.

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Abstract

A liquid crystal material for a display device includes a first chiral nematic liquid crystal component and a second component that exhibits no liquid crystalline phase at any temperature. The second component is present in an amount effective to reduce the bulk viscosity of the liquid crystal material by at least about 26 % at room temperature or is present in an amount of at least about 5 % by weight based upon the total weight of the liquid crystal material. The liquid crystal material may have a positive dielectric anisotropy. The second component may have a molecular weight not exceeding 205 grams / mole. Embodiments relate to a display device comprising the present material. Another aspect includes a method of increasing the switching speed in a display that employs the present material.

Description

[0001] This application was made with Government support in part under Cooperative Agreement Nos. NG1331-94C-0042 and NG1331-96C-0042 entered into by the Defense Advanced Research Projects Agency. The Government therefore has certain rights in this application. field of invention [0002] The present invention relates to chiral nematic liquid crystal materials for use in displays, which materials contain additives which reduce the viscosity of said materials. Background of the invention [0003] Stabilized cholesteric liquid crystals have a high viscosity due to the presence of a large amount of chiral dopants in the chiral material and the corresponding strong inherent twist. However, high viscosity may undesirably increase the response time of such materials when they are used in electro-optic devices. [0004] In order to lower the viscosity of nematic liquid crystals, various substances have been added to the material in the past. Nematic liquid crystal materials have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13C09K19/54
CPCC09K19/54
Inventor A·A·汗小S·J·拉斯科斯M·E·斯特法诺夫
Owner KENT DISPLAY SYST
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