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Liquid crystal composite containing difluorooxymethylene bridge polar monomer compound

A technology of difluoromethoxy bridge and liquid crystal composition, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of poor chemical stability, low voltage holding rate, limited application, etc., and achieve low viscosity, low rotational viscosity, The effect of fast response time

Active Publication Date: 2013-09-18
BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that compounds containing terminal cyano groups are easy to introduce ionic impurities, the voltage retention rate VHR is very low, high viscosity, slow response, and poor chemical stability such as light and heat. These unfavorable factors limit the use of this type of compound in TFT-LCD. Applications
Ester liquid crystal has the characteristics of simple synthesis method, wide variety, and wide phase transition range, but it has a very important disadvantage that it has high viscosity and poor chemical stability, which leads to the TFT-LCD formula usage is greatly reduced
Although TFT-LCD also uses the principle of TN type electro-optic effect, the liquid crystal material used in TFT-LCD is different from the traditional liquid crystal material.

Method used

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  • Liquid crystal composite containing difluorooxymethylene bridge polar monomer compound
  • Liquid crystal composite containing difluorooxymethylene bridge polar monomer compound
  • Liquid crystal composite containing difluorooxymethylene bridge polar monomer compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the examples.

[0032] The percentages in this manual are all mass percentages; the temperature is in degrees Celsius (°C); the specific meanings and test conditions of other symbols are as follows:

[0033] c.p. (°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, ne is the value of extraordinary light Refractive index, the test conditions are: 589nm, 25°C; △ε is 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 , the test box i...

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Abstract

The invention discloses a liquid crystal composite containing a difluorooxymethylene bridge polar monomer compound. The liquid crystal composite comprises the following components in percentage by weight: 1%-40% of compounds shown in a general formula I, 1%-40% of compounds shown in a general formula II, 5%-70% of compounds shown in a general formula III, 1%-60% of compounds shown in a general formula IV, 0%-20% of compounds shown in a general formula V and 0%-20% of compounds shown in a general formula VI. The liquid crystal composite disclosed by the invention has the characteristics of high response speed, low driving voltage and high resistivity and voltage conservation rate, has the capability of improving the viewing angle of a liquid crystal display by heightening the pretilt angle of a liquid crystal in a display and is suitable for a fast-responsive TFT-LCD (Thin Film Transistor Liquid Crystal Display).

Description

technical field [0001] The invention relates to a liquid crystal display material, in particular to a liquid crystal composition containing a difluoromethoxy bridge type polar monomer compound. Background technique [0002] There are many liquid crystal display modes, but the mode that utilizes the photoelectric effect of liquid crystal to realize display is widely used. The photoelectric effect actually refers to the change of the arrangement of liquid crystal molecules from one state to another when electricity is applied, thereby changing the photoelectric properties of the liquid crystal cell. The world's first liquid crystal display appeared in the early 1970s, and it was called a TN liquid crystal display (Twisted Nematic, twisted nematic). In the 1980s, STN liquid crystal display (Super Twisted Nematic, super twisted nematic) appeared, and at the same time, TFT liquid crystal display (Thin Film Transistor, thin film transistor) technology was proposed. TFT is the ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/44C09K19/46
Inventor 贵丽红乔云霞夏治国华瑞茂张冠超丰景义梁超峰王奎
Owner BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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