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Liquid crystal composition

A liquid crystal composition and compound technology, which is applied in liquid crystal materials, optics, instruments, etc., can solve the problems of liquid crystal pollution, reduce the incidence of display defects, broken bright spots, and peripheral Mura display defects, etc., achieve high anti-pollution and reduce display defects Effect

Active Publication Date: 2015-05-06
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the liquid crystal is dripped into the panel, it comes into contact with the frame glue and PI. The ions in the PI and the frame glue will easily pollute the liquid crystal, resulting in broken bright spots and poor display such as surrounding Mura. This requires the development of a liquid crystal with strong anti-pollution performance. , to reduce the incidence of poor display

Method used

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  • Liquid crystal composition
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The liquid crystal composition of the present embodiment comprises the following compounds by percentage,

[0057]

[0058] The cyclohexyl groups in all the above structural formulas are in the trans configuration. The physical parameters of the composition are as follows:

[0059] Δn=0.102; Δε=6.7; Cp=91°C; γ 1 = 128.6.

[0060] Test the VHR of Comparative Example and Example 1, and then test the VHR after matching two liquid crystals with PI and frame glue respectively. The test results are as follows:

[0061]

[0062] Conclusion: From the comparison of Example 1 and Comparative Example, it can be seen that after replacing all the linear alkyl groups at one end of each compound in the liquid crystal component in Comparative Example with cyclopropane or cyclopentane, the test shows that its voltage remains Rate (VHR) changes very little, indicating that its anti-pollution ability to frame glue and PI is significantly improved.

Embodiment 2

[0064] The liquid crystal composition of the present embodiment comprises the following compounds by percentage,

[0065]

[0066] The cyclohexyl groups in all the above structural formulas are in the trans configuration. The physical parameters of the composition are as follows:

[0067] Δn=0.081; Δε=4.5; Cp=81°C; γ 1 =61.5

[0068]

[0069] Conclusion: The fluctuation range of voltage retention rate (VHR) is extremely small, and its anti-pollution ability is strong.

Embodiment 3

[0071] The liquid crystal composition of the present embodiment comprises the following compounds by percentage,

[0072]

[0073] The cyclohexyl groups in all the above structural formulas are in the trans configuration. The physical parameters of the composition are as follows:

[0074] Δn=0.130; Δε=9.2; Cp=91°C; γ 1 =99.8

[0075]

[0076] Conclusion: The fluctuation range of voltage retention rate (VHR) is extremely small, and its anti-pollution ability is strong.

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Abstract

The invention discloses a liquid crystal composition in the formula I and the formula II as shown in the description. As an annular structure is arranged at one end of each component of the liquid crystal composition, the overall electron cloud of molecules can be uniformly arranged, the liquid crystal stability is improved, and the liquid crystal anti-flouring property is improved. Contamination caused by a frame adhesive and PI in the panel is unlikely to happen, and the display badness such as periphery Mura caused by frame adhesive puncture, and display badness such as scattered bright points caused by ion accumulation, are greatly alleviated. The liquid crystal composition is particularly applicable to active matrix displays with high resolution and rapid response.

Description

technical field [0001] The invention relates to the field of liquid crystal materials, in particular to a liquid crystal material with high anti-pollution performance. A liquid crystal composition that is less likely to be polluted by frame glue and PI in a panel. Background technique [0002] In recent years, new display devices, especially various new flat panel display devices (FPD) led by liquid crystal display (LCD) have been developed rapidly. As an important information electronic product, liquid crystal display has become increasingly important. The optical anisotropy and dielectric anisotropy of the liquid crystal material itself work. The liquid crystal device can be designed into different working modes according to the different liquid crystal materials and working methods. [0003] The main liquid crystal display methods are twisted nematic mode (TN), super twisted nematic mode (STN), optically compensated bending mode (OCB), in-plane transition liquid crystal ...

Claims

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Application Information

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IPC IPC(8): C09K19/44G02F1/1333
Inventor 李锐乔云霞颜希哲崔青徐凯
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD