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Liquid crystal composition and liquid crystal display element produced using same

一种液晶组合物、化合物的技术，应用在液晶显示元件,向列液晶组合物领域，能够解决液晶显示元件折射率驱动电场平衡崩溃、对比度不良、困难等问题，达到实现高速响应、显示不良抑制、低粘性的效果

Active Publication Date: 2014-09-10
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the deviation of the injection amount from the optimum value becomes large, the pre-designed refractive index of the liquid crystal display element and the balance of the driving electric field will collapse, resulting in display defects such as unevenness, poor contrast, etc.
In particular, small liquid crystal display elements that are frequently used in recent smartphones have a small amount of optimal liquid crystal injection, so it is inherently difficult to control the deviation from the optimal value within a certain range.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0424] The liquid crystal composition LC-1 shown below was prepared.

[0425] [chem 98]

[0426]

[0427] The physical property values ​​of LC-1 are shown below.

[0428] [Table 2]

[0429] Tni

74.3

Δn

0.121

Δε

4.1

n

10.3

gamma 1

42

[0430] The initial VHR of the liquid crystal composition LC-1 was 99.2%, while the VHR after standing at a high temperature of 150° C. for 1 hour was 98.8%. When the solubility at low temperature was evaluated, it showed excellent performance as shown in the following table. In addition, a liquid crystal display device was produced by an ODF process using the liquid crystal composition LC-1, and burn-in, drop marks, and process suitability were studied using the above-mentioned method, and the results showed excellent results as shown below.

[0431] [table 3]

[0432] Screen burn evaluation

Embodiment 2

[0445] Liquid crystal composition LC-3 shown below was prepared.

[0446] [chemical 100]

[0447]

[0448] The physical property values ​​of LC-3 are as follows.

[0449] [Table 6]

[0450] Tni

75.1

Δn

0.120

Δε

4.6

n

13

gamma 1

44

[0451] The initial VHR of the liquid crystal composition LC-3 was 99.4%, while the VHR after standing at a high temperature of 150° C. for 1 hour was 99.0%. When the solubility at low temperature was evaluated, it showed excellent performance as shown in the following table. In addition, a liquid crystal display element was fabricated by an ODF process using the liquid crystal composition LC-3, and burn-in, drop marks, and process suitability were studied using the above-mentioned method, and as a result, excellent results were shown as shown below.

[0452] [Table 7]

[0453] Screen burn evaluation

Embodiment 3～ Embodiment 4

[0466] Liquid crystal compositions LC-5 to LC-6 shown below were prepared, and their physical property values ​​were measured. The results are shown in the table below.

[0467] [Table 10]

[0468]

[0469] The low-temperature solubility of the liquid crystal compositions LC-5 to LC-6 was good, and there was almost no change between the initial VHR and the VHR after standing at a high temperature of 150° C. for 1 hour. Furthermore, when the burn-in, drop marks, and process suitability of the liquid crystal display elements produced using the liquid crystal compositions LC-5 to LC-6 were examined, excellent results were shown as follows.

[0470] [Table 11]

[0471]

LC-5

LC-6

Initial VHR(%)

98.6

98.5

VHR(%) after 1 hour at 150℃

98.3

98.3

Screen burn evaluation

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Drop mark evaluation

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Process suitability evaluation

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Solubility evaluation at low temperature

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◎ ...

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PUM

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Abstract

A liquid crystal composition according to the present invention can be used for, for example, a liquid crystal display element of an IPS type, a TN type or the like which is rapidly responsive and rarely undergoes the occurrence of display defects including a burn-in phenomenon and the formation of dropping marks. The liquid crystal composition comprises a dielectrically positive component containing a dielectrically positive compound and a dielectrically neutral component having a dielectric anisotropy degree of -2 to +2 exclusive, and has such excellent properties that the composition has a wide liquid crystal phase temperature range, has a small viscosity, has good solubility at a lower temperature, a high specific resistivity and a high voltage holding ratio, and is stable against heat and light.

Description

technical field [0001] The present invention relates to a nematic liquid crystal composition having a positive dielectric constant anisotropy (Δε) useful as a liquid crystal display material, and a liquid crystal display element using the same. Background technique [0002] Liquid crystal display elements have developed from clocks and electronic calculators to various measuring equipment, 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, vertical alignment type using TFT (Thin Film Transistor), and IPS (In-Plane Switching) type. The liquid crystal compositions used in these liquid crystal display elements are required to be stable against external stimuli such as moisture, air, heat, light, etc., to display a liquid crystal phase over as wide a temperature range as possible around room t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/42C09K19/12C09K19/30
CPCC09K2019/0466C09K19/3066C09K19/20C09K2019/301C09K2019/3078C09K19/3068C09K2019/123C09K2019/3004C09K2019/122C09K2019/0444C09K2019/0448C09K19/44C09K2019/3009
Inventor 河村丞治
Owner DIC CORP
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