A dielectrically positive liquid crystal composition

A technology of liquid crystal composition and positive liquid crystal, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., to achieve the effect of proper optical anisotropy, low voltage and high resistivity

Active Publication Date: 2015-10-28
BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far there is no single liquid crystal material used alone in liquid crystal displays that can meet the performance requirements without developing a composition with other performance characteristics

Method used

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  • A dielectrically positive liquid crystal composition
  • A dielectrically positive liquid crystal composition
  • A dielectrically positive liquid crystal composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] (1) Preparation of liquid crystal composition 1: see the following table for components and contents;

[0091]

[0092] (2) Preparation of liquid crystal composition 1-1: the composition and content of liquid crystal composition 1 are basically the same, the difference is that the compound of general formula I Replaced by cyclobutane difluoromethylene ether compounds

[0093] (3) Preparation of liquid crystal composition 1-2: the composition and content of liquid crystal composition 1 are basically the same, the difference is that the compound of general formula I Replaced by alkyl difluoromethylene ether compounds

[0094] Liquid crystal composition 1, liquid crystal composition 1-1, and liquid crystal composition 1-2 were respectively subjected to performance tests, and the test results are shown in the table below.

[0095] liquid crystal composition

[0096] From the above performance test parameters, it can be seen that the liquid crystal compo...

Embodiment 2

[0101] (1) Preparation of liquid crystal composition 2: see the following table for components and contents;

[0102]

[0103]

[0104] (2) Preparation of liquid crystal composition 2-1: the composition and content of liquid crystal composition 2 are basically the same, the difference is that the compound of general formula I Replaced by cyclobutane difluoromethylene ether compounds

[0105] (3) Preparation of liquid crystal composition 2-2: the composition and content of liquid crystal composition 2 are basically the same, the difference is that the compound of general formula I Replaced by alkyl difluoromethylene ether compounds

[0106] Liquid crystal composition 2, liquid crystal composition 2-1, and liquid crystal composition 2-2 were subjected to performance tests, and the test results are shown in the table below.

[0107] liquid crystal composition

[0108] From the above performance test parameters, it can be seen that the liquid crystal compos...

Embodiment 3

[0113] The liquid crystal composition was prepared according to the components and dosage (mass percentage) in the following table, and the performance test was carried out, and the test results were listed in the table.

[0114]

[0115]

[0116] From the performance parameters of Example 3, it can be seen that the liquid crystal composition has a moderate birefringence index, a suitably high positive dielectric anisotropy, a high clearing point, a very low rotational viscosity, and a very fast response time, and is suitable for Fast response TN-TFT display.

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Abstract

The invention discloses a dielectric positive liquid-crystal composition. The dielectric positive liquid-crystal composition comprises the following components in percentage by weight: 1%-40% of first dielectric positive component A shown by a formula I, 10%-80% of second dielectric positive component B, and 10-80% of dielectric neutral component C shown by a formula IV, wherein the mass percentage of a compound with a formula II and the mass percentage of a compound with a formula III in the second dielectric positive component B are 0-80% of the liquid-crystal composition respectively. In addition, the liquid-crystal composition is also added with a rotary optical component accounting for less than 0.5% of the sum of the mass of the first dielectric positive component A, the second dielectric positive component B and the dielectric neutral component C and more than 0. The dielectric positive liquid-crystal composition disclosed by the invention has the advantages of low viscosity, fast response time and proper optical anisotropy and dielectric anisotropy, and is especially applicable to manufacturing active-matrix TN-TFT, IPS-TFT or FFS liquid-crystal display elements with fast response.

Description

technical field [0001] The invention relates to a liquid crystal compound, in particular to a dielectrically positive liquid crystal composition used for manufacturing TFT-LCD. Background technique [0002] Liquid crystal display elements can be divided into the following modes according to different display methods: twisted nematic (TN) mode, super twisted nematic (STN) mode, in-plane mode (IPS), and vertical alignment (VA) mode. Regardless of the display mode, the liquid crystal composition used is required to have the following characteristics: [0003] (1) Stable chemical and physical properties; [0004] (2) Low viscosity; [0005] (3) Appropriate dielectric anisotropy (△ε); [0006] (4) Appropriate double deflection rate (△n); [0007] (5) Good compatibility with other liquid crystal compounds. [0008] With the continuous maturity of the active matrix (TFT) technology formed in the early 1990s, color liquid crystal flat panel displays have developed rapidly, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/44C09K19/46C09K19/30
Inventor 华瑞茂丰景义韩耀华李雅敏
Owner BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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