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Preparation method of colorless transparent polyimide liquid crystal alignment film

A technology of transparent polyimide and liquid crystal alignment film, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of limiting the application of polyimide materials, and achieve the effect of improving transparency

Active Publication Date: 2020-12-11
EAST CHINA UNIV OF SCI & TECH +1
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Problems solved by technology

[0003] At present, the alignment film material of liquid crystal display is mainly polyimide (PI) film. However, due to the influence of the conjugated structure in the structure, the traditional aromatic PI will absorb visible light and appear yellow or brown, and the traditional aromatic PI alignment film has a low pretilt angle. Only 1°~2°, which greatly limits the application of polyimide materials in the field of liquid crystal display

Method used

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  • Preparation method of colorless transparent polyimide liquid crystal alignment film
  • Preparation method of colorless transparent polyimide liquid crystal alignment film
  • Preparation method of colorless transparent polyimide liquid crystal alignment film

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Embodiment 2

[0026] The difference between Embodiment 2 and Embodiment 1 is that the types of liquid crystals poured in the liquid crystal cell are different. The liquid crystal cell is filled with TEB300 nematic liquid crystal and two kinds of cholesteric liquid crystals. and TEB300 two kinds of nematic liquid crystals were prepared by adding 2% R5011 chiral agent, and then using a polarizing microscope to observe the orientation uniformity of liquid crystal molecules in the cell, as shown in image 3 The polarized photogram shown.

[0027] image 3 Middle (1) is the polarized light micrograph of cholesteric liquid crystal after adding 2% chiral agent to E7, (2) is the polarized light micrograph of cholesteric liquid crystal added to TEB300 with chiral agent, (3) and (4) respectively It is the polarized photomicrograph of bright state and black state of TEB300 nematic liquid crystal. It can be seen from the polarized light micrographs that changing the colorless transparent polyimide al...

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Abstract

The invention discloses a preparation method of a colorless transparent polyimide liquid crystal alignment film, which comprises the steps of reacting a dianhydride monomer 6FDA and a diamine monomerTFMB in DMAC at room temperature to prepare a polyamide acid solution, uniformly coating a glass substrate with the polyamide acid solution, and carrying out pre-drying and thermal imidization treatment to prepare a liquid crystal box filled with E7 nematic phase liquid crystal, wherein the pretilt angle measured by a crystal rotation method can reach 6.9 degrees. Compared with a common aromatic polyimide alignment film, the polyimide liquid crystal alignment film has obvious advantages, is a colorless and transparent film, can obtain a high pretilt angle of 6.9 degrees, and can well meet therequirements of the liquid crystal display field for the colorless and large pretilt angle of an alignment film material, and can be used as a super-twisted nematic liquid crystal display alignment film material.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display materials, in particular to a preparation method of a colorless and transparent polyimide liquid crystal alignment film. Background technique [0002] With the continuous development of liquid crystal display technology, super-twisted nematic (STN) liquid crystal display has become an important research direction of liquid crystal display due to its high definition and large information capacity. In order to avoid disclination caused by liquid crystal anti-tilt phenomenon during use, it is required that the liquid crystal molecules in the display and the surface of the alignment film must have a certain pre-tilt angle. The size of the pretilt angle will determine the alignment state of the liquid crystal molecules in the liquid crystal cell, and then affect the photoelectric characteristics of the liquid crystal display. The preparation of an alignment film with a large pretilt ang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08J5/18C09K19/56C08L79/08
CPCC08G73/1067C08G73/1039C08J5/18C09K19/56C08J2379/08
Inventor 曹红亮施利凯钟宝其张心悦
Owner EAST CHINA UNIV OF SCI & TECH
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