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Nematic liquid-crystal composition and liquid-crystal display element including same

A liquid crystal composition and compound technology, which is applied in the field of liquid crystal display elements and nematic liquid crystal compositions, can solve the problems of low driving voltage, high transmittance and high response speed, and achieve large refractive index anisotropy and low High drive voltage and high voltage retention

Pending Publication Date: 2018-01-02
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] In Patent Document 5, a vertical alignment type liquid crystal display device using a chiral agent is disclosed. In Patent Document 6, a vertical alignment type super twisted liquid crystal display element and its manufacturing method are disclosed, but both do not take into account low Driving voltage, high transmittance and high response speed

Method used

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  • Nematic liquid-crystal composition and liquid-crystal display element including same
  • Nematic liquid-crystal composition and liquid-crystal display element including same
  • Nematic liquid-crystal composition and liquid-crystal display element including same

Examples

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Embodiment

[0322] Examples are given below to describe the present invention in further 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 %".

[0323] In the Examples, the following codes are used for describing the compounds.

[0324] (side chain)

[0325]

[0326] (link base)

[0327]

[0328] (ring structure) [Chem. 60]

[0329]

[0330] In Examples, the measured physical properties are as follows.

[0331] T ni : Nematic-isotropic liquid phase transition temperature (°C)

[0332] Δn: Refractive index anisotropy at 25°C

[0333] Δε: Dielectric constant anisotropy at 25°C

[0334] gamma 1 : Rotational viscosity at 25°C (mPa·s)

[0335] K 33 : Elastic constant K at 25°C 33 (pN)

[0336] VHR: 1V, 60Hz, 60℃ voltage retention rate VHR(%)

[0337] P: screw pitch at 25°C

[0338] In addition, the measuring method is as follows.

[0339] T ni Measurements...

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Abstract

The present invention addresses the problem of: providing a liquid-crystal composition which has a high refractive index anisotropy ([delta]n), a low rotational viscosity ([gamma]1), and a large elasticity constant (K33) and further has a high voltage holding ratio (VHR) and a negative dielectric anisotropy ([delta][epsilon]); and providing a liquid-crystal display element of excellent display quality, which includes the liquid-crystal composition and is prevented or inhibited from suffering display failures including dropping marks, image persistence, and display unevenness and which combinesa low operating voltage, a high transmittance, and a high response speed. The liquid-crystal composition, which has negative dielectric anisotropy, has a value calculated by the following expression(I) in the range of 1-50: |[delta][epsilon]| / P*100 expression (I) where |[delta][epsilon]| is the absolute value of dielectric anisotropy and P ([mu]m) is the spiral pitch, and comprises one or more of compounds represented by the general formula (np-1) and the general formula (np-2).

Description

technical field [0001] The present invention relates to a nematic liquid crystal composition having a negative dielectric constant anisotropy (Δε) useful as a liquid crystal display material, and a liquid crystal display element using the nematic liquid crystal composition. Background technique [0002] Liquid crystal display devices are used in various household electrical appliances such as clocks and electronic calculators, measuring equipment, automotive panels, word processors, electronic notebooks, printers, computers, televisions, etc. Representative examples of liquid crystal display methods include: TN (twisted nematic) type, STN (super twisted nematic) type, DS (dynamic light scattering) type, GH (guest-host) type, and IPS (in-plane switching) type , OCB (Optically Compensated Birefringence) type, ECB (Electrically Controlled Birefringence) type, VA (Vertical Alignment) type, CSH (Color Super Vertical Alignment) type, or FLC (Ferroelectric Liquid Crystal) and the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/44C09K19/12C09K19/14C09K19/20C09K19/30C09K19/54G02F1/13
CPCC09K19/44C09K19/56C09K19/54C09K19/586G02F1/13C09K19/12C09K19/14C09K19/20C09K19/30
Inventor 须藤豪平田真一
Owner DIC CORP
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