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Prepn process of dispersed polymer liquid crystal material

A technology for dispersing liquid crystals and liquid crystal materials, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc. It can solve problems such as image overlapping, brightness limitation, sealing and complex device size control, etc., and achieve high phase transition temperature and good stability , The effect of short preparation cycle

Inactive Publication Date: 2003-06-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The TN mode is widely used, and can be used to make liquid crystal displays with low voltage, low power consumption, long life, etc., but when these displays are large and require high resolution, many problems will occur, and these Problems directly limit the further development of TN, which include: the speed of opening and closing is not fast, and it is easy to cause image overlap; due to the use of polarizers, the viewing angle is very small, and the contrast can only be changed in a small angle; These factors limit the development of high-performance display and projection equipment
Of course, in addition to the above-mentioned functional indicators that cannot meet the requirements, the manufacturing process of TN devices is very demanding, and its sealing and device size control have very complicated problems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put epoxy resin and liquid crystal E7 in a container at a weight ratio of 1:2.5, stir and heat to 60°C, add ethylenediamine (EDA) whose weight is 1 / 3 of the total weight of epoxy resin and liquid crystal E7, and stir well The resulting viscous liquid is coated between the conductive glass, and the voltage applied to the two ends of the conductive glass is 65V, and it is placed at 80°C for 1.5 hours to cure at a constant temperature, and the PDLC film can be obtained. The phase transition temperature T of the prepared PDLC film NI Compared with that prepared without electric field, the temperature increased by 8°C.

Embodiment 2

[0019] In this example, epoxy acrylic resin, methyl methacrylate and polyurethane were selected respectively, and K21 was selected as the liquid crystal, and the preparation conditions were the same as in Example 1. The phase transition temperature of K21 was 116°C, and the phase transition temperature of the prepared PDLC was 121°C, respectively. 123°C, 120°C.

Embodiment 3

[0021] In this example, 80CB, 7CB, K21, K15, 5CB or E7 liquid crystals were selected respectively, and the substrate was E51. °C, 62 °C.

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Abstract

The preparation process of dispersed polymer liquid-crystal material includes the main steps of: mixing the substrate material and liquid crystal material in the weight ratio of 0.25-1 in a containerthrough stirring, painting the mixture between two conductive glass plates with coated indium tin oxide film, applying DC voltage of 45-65 V across the glass plates to cure the mixture as dispersed polymer liquid crystal material. The dispersed polymer liquid crystal material thus prepared has high phase transferring temperature and high stability. The preparation process is simple, environment friendly, short in preparation period and suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing an electro-optic display material, in particular to a method for preparing a polymer-dispersed liquid crystal electro-optic display material. Background technique [0002] In the field of display applications, the invention of twisted liquid crystal device TN (Twisted Nematic Cell) makes the use of liquid crystals epoch-making. The TN mode is widely used, and can be used to make liquid crystal displays with low voltage, low power consumption, long life, etc., but when these displays are large and require high resolution, many problems will occur, and these Problems directly limit the further development of TN, which include: the speed of opening and closing is not fast, and it is easy to cause image overlap; due to the use of polarizers, the viewing angle is very small, and the contrast can only be changed in a small angle; These factors limit the development of high-performance display and projection eq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/52
Inventor 林嘉平余天石张文杰李想
Owner EAST CHINA UNIV OF SCI & TECH
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