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Liquid crystal composition and liquid crystal display device

A liquid crystal composition, liquid crystal display technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of long response time, low resistivity, and high operating voltage

Active Publication Date: 2013-08-14
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since liquid crystals are usually used as a mixture of various components, the mutual solubility between the components is particularly important, and according to different application fields, liquid crystals must meet different requirements, such as dielectric anisotropy and optical anisotropy. Anisotropy, etc., but the obvious disadvantages in the prior art are longer response time, lower resistivity and too high operating voltage, such as EP0673986, DE19528106, DE19528107
In addition, poor storage stability at low temperature is also a defect of many existing liquid crystal materials.

Method used

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  • Liquid crystal composition and liquid crystal display device
  • Liquid crystal composition and liquid crystal display device
  • Liquid crystal composition and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0080] The synthetic route of Preparation Example 1 chemical formula (I-1) is as follows:

[0081]

[0082] Its specific process is as follows:

[0083] Among them, compound A and compound B can be synthesized by known methods in the prior art (for the synthesis method, refer to CN100415730C).

[0084] Add 17mmol compound A, 17mmol compound B, 50mL toluene, 25mL ethanol, 25mL water, 68mmol sodium carbonate to a 250mL three-necked flask, add 0.85mmol Pd(PPh 3 ) 4 , continue to reflux under the protection of nitrogen, and react for 6 hours. After the reaction is completed, the reaction solution is post-treated and purified by column chromatography to obtain a white solid I-1, GC ≥ 99%.

[0085] R 1 :CH 3 , to prepare compounds of the following formula:

[0086]

[0087] Yield: 84.5%; DSC: C106.8I; △n: 0.193; △ε: 24; Cp: 66.6;

[0088] R 1 :C 2 h 5 , to prepare compounds of the following formula:

[0089]

[0090] Yield: 75.5%; DSC: C80I; △n: 0.166; △ε: 24; Cp:...

preparation example 2

[0097] The synthetic route of preparation example 2 compound (I-2) is as follows:

[0098]

[0099] Its specific process steps are as follows:

[0100] 1) Synthesis of Compound D

[0101] Add 20mmol compound A, 21mmol 3,5-difluorobromobenzene, 50mL toluene, 25mL ethanol, 25mL water, 80mmol sodium carbonate into a 250mL three-necked flask, and add 1mmol Pd(PPh 3 ) 4 , continue to reflux under the protection of nitrogen, and react for 6 hours. After the reaction is completed, the reaction solution is post-treated and purified by column chromatography to obtain a white solid D with a yield of 75% and GC ≥ 98%.

[0102] 2) Synthesis of Compound E

[0103] Add 15mmol of compound D and 100mL of anhydrous tetrahydrofuran into a 250mL three-necked flask. Under nitrogen protection, cool down to -78°C, add 4.4mL of n-BuLi solution (2.5mol / L, n-hexane solution) dropwise, and continue to control Stir at -78°C for 1h, add dropwise 13mmol CF 2 Br 2 and 20ml of anhydrous tetrahydrof...

Embodiment 1

[0123] The liquid crystal composition of Example 1 was formulated according to the compounds and weight percentages listed in Table 5, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0124] Table 5 liquid crystal composition formula and test performance thereof

[0125]

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Abstract

The invention provides a liquid crystal composition and applications thereof. The liquid crystal composition comprises the following ingredients in percentage by weight: 5-60% of compound in a formula I, 10-50% of compound in a formula II, and 10-80% of compound in a formula III. The liquid crystal composition has great dielectric anisotropy, faster response speed and good low-temperature storage stability. The invention further provides an active matrix liquid crystal display device comprising the liquid crystal composition.

Description

technical field [0001] The present invention relates to a liquid crystal composition, in particular to a liquid crystal composition with proper dielectric anisotropy, fast response speed and good low-temperature storage stability and its application in active matrix liquid crystal display devices . Background technique [0002] Liquid crystal display devices are used in various home appliances represented by watches and desktop computers, measuring instruments, car dashboards, word processors, electronic notebooks, printers, computers, televisions, etc. Examples of liquid crystal display methods include TN (twisted nematic) type, STN (super twisted nematic) type, DS (dynamic light scattering) type, IPS (in-plane switching) type, OCB (dispersion super vertical) type, ECB (voltage Controlled birefringence) type or VA (vertical alignment) type and other representative methods. In addition, as the driving method, the traditional static driving has been changed to multiple driv...

Claims

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Application Information

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IPC IPC(8): C09K19/44
Inventor 胡娟韩文明李薇胡海军
Owner JIANGSU HECHENG DISPLAY TECHCO
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