Liquid crystal composition and liquid crystal display element manufactured using same

A technology of liquid crystal composition and compound, which is applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of insufficient effect, display burn-in, etc., and achieve the effect of less burn-in and excellent high-speed response

Active Publication Date: 2014-08-20
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, there is a problem of display burn-in caused by the polymeric compound added to the liquid crystal, and the effect of suppressing drip marks is not sufficient. It is necessary to develop a liquid crystal display device that maintains the basic characteristics of the liquid crystal display element and is difficult to use. Liquid crystal display elements with burn-in and drop marks

Method used

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  • Liquid crystal composition and liquid crystal display element manufactured using same
  • Liquid crystal composition and liquid crystal display element manufactured using same
  • Liquid crystal composition and liquid crystal display element manufactured using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0247] A liquid crystal composition having the composition shown below was prepared, and its physical properties were measured. The results are shown in the following table.

[0248] Using the liquid crystal composition of Example 1, a VA liquid crystal display element was produced. The liquid crystal display element has an inverse-stack type thin film transistor as an active element. The injection of the liquid crystal composition was performed by the dropping method, and evaluation of burn-in, drip marks, process suitability, and low temperature solubility was performed.

[0249] In addition, the symbol on the left side of the content is the description of the abbreviated symbol of the above-mentioned compound.

[0250] [Chemical 28]

Embodiment 1

[0252]

[0253] [Table 1]

[0254] T NI / ℃ 75.8 Δn 0.108 n o 1.484 Δε -3.0 ε ⊥ 6.5 η / mPa·s 16.9 Y 1 / mPas 116 Y1 / Δn 2 9.9 Initial voltage retention rate / % 99.9 Voltage retention rate after 1h at 150℃ / % 99.3 Burn-in evaluation ◎ Drip mark evaluation ◎ Process suitability evaluation ◎ Solubility evaluation at low temperature ◎

[0255] It was found that the liquid crystal composition of Example 1 had a liquid crystal phase temperature range of 75.8°C useful as a liquid crystal composition for TV, a large absolute value of dielectric constant anisotropy, a low viscosity, and an optimum Δn. A VA liquid crystal display element was produced using the liquid crystal composition described in Example 1, and screen burn-in, drip marks, process suitability, and solubility at low temperature were evaluated by the methods described above, and the results showed extremely excellent evaluation r...

Embodiment 2 and Embodiment 3）

[0274] A liquid crystal composition having the composition shown below was prepared so as to have the same liquid crystal phase temperature range, the same refractive index anisotropy value, and the same dielectric constant anisotropy value as the composition of Example 1 (Example 1). Example 2 and Example 3), the physical property values ​​were measured. The results are shown in the following table.

[0275] Using the liquid crystal compositions of Examples 2 and 3, a VA liquid crystal display element was produced in the same manner as in Example 1, and the evaluation results of burn-in, drip marks, process suitability, and low-temperature solubility are shown in the same table. middle.

[0276] [Table 4]

[0277]

[0278] It was found that the liquid crystal composition of Example 2 has a liquid crystal phase temperature range practical as a liquid crystal composition for TV, a large absolute value of dielectric constant anisotropy, a low viscosity, and an optimum Δn. ...

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PropertyMeasurementUnit
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Abstract

TOne of the purposes of the present invention is to provide a liquid crystal composition which has a positive [Delta][epsilon] value, also has a liquid crystal phase over a broad temperature range, good solubility at lower temperatures, excellent ODF process compatibility, high specific resistance and a high voltage holding ratio, and is stable to heat and light. In order to achieve the purpose, a liquid crystal composition is provided, which comprises a compound represented by formula (i) and a compound represented by formula (ii).

Description

technical field [0001] The present invention relates to a liquid crystal composition and a liquid crystal display element useful as constituent members of a liquid crystal display device or the like. Background technique [0002] Liquid crystal display elements have developed from clocks and calculators to various measuring instruments, automotive panels, word processors, electronic notepads, printers, computers, televisions, clocks, advertising display boards, etc. Typical liquid crystal display methods include TN (Twisted Nematic) type, STN (Super Twisted Nematic) type, VA (Vertical Alignment) type using TFT (Thin Film Transistor), and IPS (In-Plane Switching) type etc. The liquid crystal composition used in these liquid crystal display elements is required to be stable against external factors such as moisture, air, heat, light, etc., to display a liquid crystal phase in as wide a temperature range as possible around room temperature, and to have low viscosity and low dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/30C09K19/44G02F1/1333
CPCC09K2019/3027C09K19/44C09K2019/301C09K2019/3009C09K19/42C09K2019/123C09K2019/3004C09K19/12C09K2019/3016C09K2019/0448G02F1/13C09K19/30C09K19/3003
Inventor 岩下芳典根岸真
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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