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Liquid crystal composition containing difluoro methoxyl ether compounds

A technology of liquid crystal composition and difluoromethylene ether, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of TFT liquid crystal display such as insufficient response speed, low voltage, and insufficient charge retention rate, and achieve excellent high temperature and UV stability, low voltage, and improved low-temperature miscibility

Active Publication Date: 2013-08-21
BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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AI Technical Summary

Problems solved by technology

However, due to the limitations of the liquid crystal material itself, TFT liquid crystal displays still have many defects such as insufficient response speed, insufficient voltage, and insufficient charge retention rate.

Method used

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  • Liquid crystal composition containing difluoro methoxyl ether compounds
  • Liquid crystal composition containing difluoro methoxyl ether compounds
  • Liquid crystal composition containing difluoro methoxyl ether compounds

Examples

Experimental program
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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with specific embodiments.

[0037] The percentages in this manual are percentages by mass, and the temperature is in degrees Celsius (°C). The specific meanings and test conditions of other symbols are as follows:

[0038] cp (°C) represents the clearing point of liquid crystal; S-N represents the melting point (°C) from crystal state to nematic phase of liquid crystal; △n is optical anisotropy, no is the refractive index of ordinary light, and ne is the refractive index of extraordinary light , the test conditions are: 589nm, 25°C; △ε is the 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, the test conditions are: 25°C, 1KHz, HP4284A, 5.2 micron TN left-handed cell; τ is the response time (ms), the test instrument is DMS-501, the test conditions are: 25±0.5°C , test...

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Abstract

The invention discloses a liquid crystal composition containing difluoro methoxyl ether compounds and belongs to the field of liquid crystal display materials. The composition contains 5-60% of the difluoro methoxyl ether compounds of a component A, shown as general formulas I and II, 1-50% of a compound of a component B, shown as a general formula III, 1-40% of a compound of a component C, shown as a general formula IV and 0-40% of a compound of a component D, shown as a general formula V and is simultaneously added with an optical activity compound accounting for 0-0.2% of the total mass of the components A, B, C and D. The composition disclosed by the invention has the advantages of low viscosity, fast response time, appropriate optical property, good anisotropy and appropriate positive dielectric anisotropy and particularly suitable for the manufacturing of quick-response TN-TFT (Twisted Nematic-Thin Film Transistor), IPS (In-Plane Switching)-TFT liquid crystal display elements.

Description

technical field [0001] The invention relates to a liquid crystal compound, in particular to a liquid crystal composition suitable for TFT displays containing difluoromethoxy ether compounds. Background technique [0002] Liquid crystal display elements can be divided into TN (twisted nemtic twisted nematic), STN (super teisted nemtic super twisted nematic), IPS (in-plan switching), VA (vertical aligbnent vertical alignment), OCB (optically compensated bend) and other types. With the rapid development of TFT (thin film transistor thin film transistor) array-driven liquid crystal display (TFT-LCD) technology, people have been actively researching TFT displays with fast response and high contrast in recent years. [0003] Since the liquid crystal molecules are driven by a thin-film transistor array, the crossover effect is eliminated, so the TFT display has the characteristics of large display information capacity; in addition, because the display is used in conjunction with l...

Claims

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Application Information

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IPC IPC(8): C09K19/44
Inventor 华瑞茂夏治国丰景义王奎
Owner BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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