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Liquid crystal composition and liquid crystal display device

A liquid crystal composition and compound technology, which is applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems that liquid crystal displays cannot work in high temperature environments, liquid crystal displays cannot display normally, and the reliability performance of high and low temperatures is reduced. Achieve proper dielectric anisotropy, good UV stability, and lower driving voltage

Active Publication Date: 2018-01-30
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the various performances of liquid crystal materials are mutually restricted. Accelerating the response speed will often bring about a decrease in the clearing point, resulting in the failure of the liquid crystal display to work in a high temperature environment, and the reduction of high and low temperature reliability. not displaying properly

Method used

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  • Liquid crystal composition and liquid crystal display device
  • Liquid crystal composition and liquid crystal display device
  • Liquid crystal composition and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0183] The compound of general formula Ⅰ-2 is obtained by the method of suzuki coupling using commercially available raw materials, and the synthetic route is as follows:

[0184]

[0185] Among them, R 2 represents an alkyl group having 1 to 5 carbon atoms. Both Compound A and Compound B are commercially available.

[0186] Prepare the compound of following structural formula by above-mentioned method:

[0187] When R 2 =C 2 h 5 When, obtain the compound of following structural formula by above-mentioned method:

[0188]

[0189] When R 2 =C 3 h 7 When, obtain the compound of following structural formula by above-mentioned method:

[0190]

[0191] When R 2 =C 4 h 9 When, obtain the compound of following structural formula by above-mentioned method:

[0192]

[0193] When R 2 =C 5 h 11 When, obtain the compound of following structural formula by above-mentioned method:

[0194]

[0195] Table 2 Performance parameters of compound liquid crystals...

Embodiment 1

[0205] The liquid crystal composition of Example 1 was formulated according to the compounds and weight percentages listed in Table 4, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0206] Table 4 liquid crystal composition formula and test performance thereof

[0207]

[0208] From the above Example 1 and Comparative Example 1, it can be seen that when the optical anisotropy, dielectric anisotropy, and clearing point are similar, the liquid crystal composition of the present invention has better low-temperature storage stability, and at the same time, it is stable under high temperature and UV light. It has a better voltage retention rate after exposure to light, and is more suitable for harsh environments.

Embodiment 2

[0214] The liquid crystal composition of Example 2 was prepared by each compound listed in Table 6 and the weight percentage, which was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0215] Table 6 liquid crystal composition formula and test performance thereof

[0216]

[0217] From the above Example 2 and Comparative Example 2, it can be seen that when the optical anisotropy, dielectric anisotropy and clearing point are similar, the liquid crystal composition of the present invention has better low-temperature storage stability, and at the same time, it has better storage stability at high temperature and UV After lighting, it has a better voltage retention rate.

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Abstract

The invention provides a liquid crystal composition. The liquid crystal composition comprises one or more compounds as shown in the general formula I-1 and / or general formula I-2; one or more compounds as shown in the general formula II; one or more compounds as shown in the general formula III; and one or more compounds as shown in the general formula IV. The liquid crystal composition has characteristics of proper optical anisotropy, proper dielectric anisotropy, high clearing point, good cryogenic storage stability, good high-temperature stability and UV stability and the like, is applicable to a liquid crystal display, can effectively reduce driving voltage and also can be applied to a harsh operating environment. The invention also discloses a liquid-crystal display device containing the liquid crystal composition.

Description

technical field [0001] The present invention relates to a liquid crystal composition, in particular to a liquid crystal composition with suitable optical anisotropy, suitable dielectric anisotropy, good low-temperature storage stability, good high-temperature stability and UV stability, And a liquid crystal display device comprising the liquid crystal composition. Background technique [0002] Liquid crystal material is a mixture of organic rod-shaped small molecular compounds that have both fluidity of liquid and anisotropy of crystal at a certain temperature. Liquid crystal display elements work by utilizing the optical anisotropy and dielectric anisotropy of the liquid crystal material itself, and have been widely used at present. Utilizing the different characteristics and working modes of liquid crystal materials, the device can be designed into various working modes. Among them, the TN mode (twisted nematic mode, the liquid crystal mixture has a nematic structure with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/44G02F1/1333
Inventor 马文阳韩文明徐海彬施红萍马定福李鹏飞丁文全戴慧娟刘云云贺迪姚丽芳张鹤鸣
Owner JIANGSU HECHENG DISPLAY TECHCO
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