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A kind of positive dielectric anisotropy liquid crystal composition

A liquid crystal composition, anisotropic technology, applied in liquid crystal materials, chemical instruments and methods, etc., to achieve the effects of excellent high temperature stability and ultraviolet stability, low threshold voltage, broad application prospects and market value

Active Publication Date: 2016-04-06
BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, no single liquid crystal compound has been found that can meet the above performance requirements. It is necessary to combine multiple liquid crystal compounds into a liquid crystal composition to meet the performance requirements of liquid crystal display materials.

Method used

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  • A kind of positive dielectric anisotropy liquid crystal composition
  • A kind of positive dielectric anisotropy liquid crystal composition
  • A kind of positive dielectric anisotropy liquid crystal composition

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Experimental program
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Embodiment Construction

[0031] Below in conjunction with embodiment the present invention is described in further detail:

[0032] The parts involved in the following examples are all mass percentages, and the temperature unit is ° C. The specific meanings and test conditions of other symbols are as follows:

[0033] c.p. indicates the clearing point of the liquid crystal (°C);

[0034] S-N represents the melting point (°C) from the crystalline state of the liquid crystal to the nematic phase;

[0035] Δn means optical anisotropy, Δn=n o -n e , where n o is the refractive index of ordinary light, n e is the refractive index of extraordinary light, test conditions: 589nm, 25°C;

[0036] △ε means dielectric anisotropy, △ε=ε ∥ -ε ⊥ , where ε ∥ is the dielectric constant parallel to the molecular axis, ε ⊥ is the dielectric constant perpendicular to the molecular axis, test conditions: 25°C, 1KHz, HP4284A, 5.2 micron TN left-handed cell;

[0037] τ means response time (ms), test instrument: DMS-5...

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Abstract

The invention discloses a liquid crystal composition with positive dielectric anisotropy. The liquid crystal composition comprises the following components in percentage by weight: 1-60% of a compound shown as a general formula I, 1-70% of a compound shown as a general formula II, 1-70% of a compound shown as a general formula III, 0-40% of a compound shown as a general formula IV and 0-40% of a compound shown as a general formula V, and further comprises an optically-active component of which the addition amount is 0-0.2% of the total mass of the compounds shown as the general formula I, II, III, IV and V. The liquid crystal composition has low rotational viscosity, high response speed and appropriate positive dielectric anisotropy, and is especially suitable for manufacturing fast-response active matrix TN-TFT and IPS-TFT liquid crystal display elements and liquid crystal displays.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a positive dielectric anisotropy liquid crystal composition which can be used to manufacture fast-response TFT-LCDs. Background technique [0002] In recent years, liquid crystal displays have replaced traditional cathode ray tube displays and become mainstream products in the field of information display today, widely used in various displays such as instruments, computers, and televisions. At present, people's requirements for display technology are also constantly increasing, mainly reflected in the requirement that liquid crystal display technology has the characteristics of fast response, low driving voltage and low power consumption. [0003] As one of the important optoelectronic materials of liquid crystal display, liquid crystal material plays an important role in improving the performance of liquid crystal display. Liquid crystal materials used for display need to meet t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/44C09K19/46C09K19/34
Inventor 华瑞茂史子谦李雅敏温刚王奎
Owner BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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