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Liquid crystal composition and liquid crystal display device

A technology for liquid crystal display elements and liquid crystal compositions, which is applied in the directions of liquid crystal materials, instruments, chemical instruments and methods to achieve the effects of fast response speed, excellent low temperature storage stability, and high VHR

Pending Publication Date: 2020-02-04
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] On the other hand, in Patent Document 6, it is disclosed that the response speed of the vertical liquid crystal cell can be improved by using a liquid crystal material with a large index shown in (Formula 1), but it cannot be said that it can fully satisfy

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

Embodiment

[0247] The following examples are given to further describe the present invention in detail, but the present invention is not limited to these examples. In addition, "%" in the composition of a following Example and a comparative example means "mass %". The following abbreviations are used for descriptions of compounds in Examples.

[0248] (side chain)

[0249] -n -C n h 2n+1 straight-chain alkyl group with carbon number n

[0250] n-C n h 2n+1 - Straight-chain alkyl group with carbon number n

[0251] -On -OC n h 2n+1 straight-chain alkoxy group with carbon number n

[0252] nO-C n h 2n+1 O- straight-chain alkoxy group with carbon number n

[0253] -V -CH=CH 2

[0254] V-CH 2 =CH-

[0255] -V1 -CH=CH-CH 3

[0256] 1V-CH 3 -CH=CH-

[0257] -F -F

[0258] -OCF3 -OCF 3

[0259] (link base)

[0260] -CF2O- -CF 2 -O-

[0261] -OCF2- -O-CF 2 -

[0262] -1O- -CH 2 -O-

[0263] -O1- -O-CH 2 -

[0264] -2- -CH 2 -CH 2 -

[0265] -COO- -COO-

[02...

preparation Embodiment 1

[0283] The liquid crystal compositions of Example 1 (LC-1), Comparative Example 1 (LC-A) and Comparative Example 2 (LC-B) were prepared, and their physical properties were measured. Table 1 shows the component ratios and physical property values ​​of these liquid crystal compositions.

[0284] [Table 1]

[0285]

Embodiment 1

[0286] T of Example 1 (LC-1) NI High, T CN Low, so the temperature range of the nematic phase is wider, Δn is larger, Δε is negative and its absolute value is larger, γ 1 Smaller, K 11 Larger, K 33 Larger, responsiveness-related γ 1 / K 33 smaller. FFS-type and VA-type liquid crystal display elements obtained using the same were produced, and it was confirmed that fast response speed, high VHR, and excellent low-temperature storage stability were compatible, and that there was no display defect. That is, the liquid crystal composition of Example 1 (LC-1) was excellent in each physical property, and solved the subject of this invention.

[0287] On the other hand, using the FFS-type and VA-type liquid crystal display elements produced in Comparative Example 1 (LC-A), it was confirmed that the response speed was significantly slower, about 15% slower than that of Example 1 (LC-1). % responsiveness. In addition, the VHR of Comparative Example 1 (LC-A) was a very low value ...

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Abstract

The present invention addresses the problem of providing: a liquid crystal composition which has a negative dielectric constant anisotropy (delta[Epsilon]), a large refractive index anisotropy (deltan), a high nematic-isotropic liquid phase transition temperature (TN I), a low solid-nematic phase transition temperature (TCN), a sufficiently low rotational viscosity (gamma 1) and a large elastic constant (K33); and a liquid crystal display device using the same of VA-, FFS- or IPS-type, etc., which has a high response speed and a high VHR as well as an excellent low-temperature storage stability and shows no or very little display defect. According to the present invention, the above problem is solved by a liquid crystal composition which comprises compounds represented by general formulae(S1), (S2) and (S3).

Description

technical field [0001] The present invention relates to a liquid crystal composition and a liquid crystal display device using the same. Background technique [0002] Liquid crystal display devices are used in various household electrical appliances including clocks and calculators, industrial measurement equipment, automotive panels, mobile phones, smartphones, notebook computers, tablet computers, and televisions. Representative liquid crystal display methods include: TN (twisted nematic) type, STN (super twisted nematic) type, GH (guest-host) type, IPS (in-plane switching) type, FFS (fringe field switching) type , OCB (Optically Compensated Birefringence) type, ECB (Electrically Controlled Birefringence) type, VA (Vertical Alignment) type, CSH (Color Super Vertical Alignment) type, FLC (Ferroelectric Liquid Crystal) and so on. In addition, examples of the driving method include static driving, multiplex driving, simple matrix method, active matrix (AM) method of driving ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/42C09K19/12C09K19/14C09K19/16C09K19/18C09K19/20C09K19/30G02F1/13
CPCC09K19/12C09K19/14C09K19/16C09K19/18C09K19/20C09K19/30C09K19/42C09K19/3066C09K2019/0448C09K2019/3004C09K2019/3009C09K2019/301C09K2019/3027C09K2019/122C09K2019/123C09K2019/3016G02F1/13712C09K19/3003G02F1/13G02F1/1362
Inventor 须藤豪大石晴己谷口士朗栗泽和树
Owner DIC CORP
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