Nematic liquid crystal composition and liquid crystal display element using same
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A technology for liquid crystal compositions and compounds, applied in liquid crystal materials, instruments, chemical instruments and methods, etc., can solve problems such as inadequacy, and achieve the effects of fast response speed, suppression of poor display, and excellent display quality
Active Publication Date: 2016-12-14
DIC CORP
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[0021] In addition, Patent Document 6 discloses that the response speed of a vertical liquid crystal cell can be improved by using a liquid crystal material having a large index represented by (Formula 1), but this cannot be said to be sufficient.
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[0417] The following examples are given to illustrate the present invention in more 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 %".
[0418] The following abbreviations are used to describe the compounds in the Examples.
[0419] (side chain)
[0420]
[0421] (link base)
[0422]
[0423] (ring structure)
[0424] [chem 83]
[0425]
[0426] In the examples, the measured characteristics are as follows.
[0427] T ni : Nematic-isotropic liquid phase transition temperature (°C)
[0428] Δn: Refractive index anisotropy at 20°C
[0429] Δε: Dielectric constant anisotropy at 25°C
[0430] η: Viscosity at 20°C (mPa·s)
[0431] gamma 1 : Rotational viscosity at 20°C (mPa·s)
[0432] K 33 : Elastic constant K at 20°C 33 (pN)
[0433] VHR(UV): The voltage retention rate (1V, 60Hz, 60°C) after irradiating 150(J) UV with a high-pressure mercury ...
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Abstract
Provided are a liquid crystal composition containing a compound represented by general formula (I-IV) and containing a compound represented by general formula (I), and a liquid crystal display element which uses the liquid crystal composition. This liquid crystal composition has adequately low viscosity (eta), adequately low rotational viscosity (gamma1), a large elastic coefficient (K33), a high voltage holding rate (VHR (UV)) after UV irradiation, and negative dielectric anisotropy ([delta]epsilon) having a large absolute value without a reduction in refractive index anisotropy ([delta]n) and nematic phase-isotropic liquid phase transition temperature (Tni), and a display element which uses the liquid crystal composition makes it possible to realize high response speed and excellent display quality in which display defects are eliminated or suppressed.
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 same. Background technique [0002] Liquid crystal display devices are used in various household electrical appliances represented by clocks and calculators, measuring instruments, panels for automobiles, word processors, electronic notebooks, printers, computers, televisions, and the like. As the liquid crystal display mode, its representatives include: TN (Twisted Nematic, twisted nematic) type, STN (Super Twisted Nematic, super twisted nematic) type, DS (Dynamic light scattering, dynamic light scattering) type, GH ( Guest Host, guest-host) type, IPS (InPlane Switching, in-plane switching) type, OCB (Optically Compensated Birefringence, optically compensated birefringence) type, ECB (Electrically Controlled Birefringence, voltage-controll...
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