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Liquid crystal display (LCD) panel, alignment films thereof and preparation method of alignment films

A liquid crystal alignment and liquid crystal panel technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of small viewing angle, serious brightness difference and chromatic aberration, limitations, etc., to improve the mura situation, improve the optical quality, improve the The effect of uniformity

Active Publication Date: 2013-09-18
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TN / STN liquid crystal display is one of the earlier commercialized displays, but its application is greatly limited due to its small viewing angle, serious brightness difference and color difference under large viewing angles.
Later, the viewing angle and chromatic aberration problems of TN / STN displays can be improved to a certain extent by means of compensation films, but at the same time, its manufacturing cost is also increased, and its effect still cannot fully meet people's requirements for high-quality displays.

Method used

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  • Liquid crystal display (LCD) panel, alignment films thereof and preparation method of alignment films
  • Liquid crystal display (LCD) panel, alignment films thereof and preparation method of alignment films
  • Liquid crystal display (LCD) panel, alignment films thereof and preparation method of alignment films

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This alignment molecule is formed by the polymerization of at least one monomer and has the following structural formula e:

[0039]

[0040] Wherein, the structural unit A and / or B has a terphenyl group.

[0041] This alignment molecule is usually a polyimide (PI) polymer formed by the dehydration polymerization of diamine monomers and dianhydride monomers. In this embodiment, a dianhydride monomer (see structural formula a1) with the following structure and two diamine monomers (see structural formula t1 and b1) are used for polymerization. The ratio of the amount of monomers represented by structural formula a1, t1, and b1 is 5:2:3, and the polyimide alignment type molecule PI-1 is synthesized.

[0042] Structural formula a1

[0043] Structural formula t1

[0044] Structural formula b1

[0045] In this embodiment, the proportion of terphenyl-containing monomer t1 accounts for 20% of the total amount of all monomers. Since the monomer of structural formula t1 c...

Embodiment 2

[0057] Compared with Example 1, this embodiment is different in that the alignment molecule is formed by the monomers of structural formula a1, structural formula t2, and structural formula b1 to form polyimide alignment molecule PI-2.

[0058] Structural formula a1

[0059] Structural formula t2

[0060] Structural formula b1

[0061] In this example, the ratio of the amount of monomers represented by structural formulas a1, t2, and b1 is 5:1:4, and the amount of terphenyl is 10% of the total monomers, forming a polymer The molecular weight of PI-2 is 5000~5×10 5 between. Similarly, structural formula t2 contains a terphenyl structure, and the formed alignment molecule PI-2 must contain a terphenyl structure.

[0062] The oriented molecule PI-2 is dissolved in a mixed solvent of NMP and γ-butyrolactone (γ-BL), and then the leveling agent isophorone is added and mixed uniformly. Wherein NMP accounts for 95% of the mass percentage of the alignment film solution, γ-BL ac...

Embodiment 3

[0068] Compared with Example 1, this embodiment is different in that the alignment molecule is a polyimide alignment molecule PI-3 formed from monomers of structural formula a2, t2 and structural formula b2.

[0069] In this embodiment, the monomers of structural formula a2, t2, and b2 are in a ratio of 5:1.5:3.5 according to the amount of substances, and the amount of terphenyl group is 15% of the total amount of monomers, forming an alignment molecule The molecular weight range of PI-3 is 5000~1×10 5 . Similarly, structural formula t2 contains a terphenyl structure, and the formed alignment molecule PI-2 must contain a terphenyl structure.

[0070] Structural formula a2

[0071] Structural formula t2

[0072] Structural formula b2

[0073] Dissolve the material of PI-3 in the mixed solvent of NMP and N-ethylpyrrolidone (NEP), then add the leveling agent diacetone alcohol and mix well. The mass percentage of NMP in the alignment film solution is 85%, the mass percenta...

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Abstract

The invention relates to liquid crystal display (LCD) technology and in particular relates to LCD alignment films. The LCD alignment films are arranged on base plates of an LCD panel. Each alignment film comprises a plurality of alignment type molecules. The alignment type molecules are formed by polymerizing at least a monomer and are shown in a structural formula e in the specification, wherein, A and / or B has terphenyl. The invention also provides a preparation method of the alignment films and the LCD panel prepared by adopting the alignment films. The alignment films, the LCD panel and the preparation method have the beneficial effects that by introducing photosensitive groups to optimize the structures of alignment film materials, the reaction rates of polymerizable monomers can be regulated to appropriate production ranges, and the reaction uniformity of the polymerizable monomers in reaction zones can be improved, thus effectively improving the mura condition and improving the optical grade of the LCD panel.

Description

Technical field [0001] The invention relates to liquid crystal display technology, in particular to a new type of liquid crystal alignment technology. Background technique [0002] In recent years, with the continuous development of information technology, mobile phones, computers, and even ordinary household appliances have gradually developed in the direction of intelligence, lightness, and mobility. Therefore, the efficiency of information exchange between humans and machines has become very critical. In order to be able to communicate the information processed by the machine to people efficiently and clearly, the role of high-efficiency, high-quality, large-capacity, lightweight, low-cost, and low-energy-consumption displays plays an important role, resulting in traditional CRT displays being used in just a few years. Replaced by thin and light liquid crystal displays. [0003] The liquid crystal displays used in the early days mostly adopted TN (Twisted nematic) or STN (Super...

Claims

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Application Information

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IPC IPC(8): C09K19/56G02F1/1337G02F1/1333
CPCC09K19/322C09K19/14C09K19/20C09K19/3066C09K19/56C09K2019/0448C09K2019/122C09K2019/205C09K2019/3083G02F1/133711
Inventor 钟新辉李冠政
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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