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Liquid crystal composition and liquid crystal display device containing liquid crystal composition

A liquid crystal composition and technology of the composition, applied in the directions of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of long response time, difficult storage stability at low temperature, low resistivity, etc.

Active Publication Date: 2013-03-27
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the optimization of various performance parameters of mixed liquid crystal materials is contradictory, mutually restrictive and mutually influencing, it is necessary to obtain a wide range of nematic phase, appropriate refractive index anisotropy and dielectric anisotropy, and low temperature storage Stability is more difficult
Among the liquid crystal compositions described in EP0667555, EP0673986, DE19528106, DE19528107, WO962851, significant disadvantages are long response time, low resistivity and high operating voltage
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 containing liquid crystal composition
  • Liquid crystal composition and liquid crystal display device containing liquid crystal composition
  • Liquid crystal composition and liquid crystal display device containing liquid crystal composition

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0082] Preparation of compounds of general formula (I)

[0083] 1) In the solvent tetrahydrofuran, at room temperature, the compound of general formula 1

[0084] (Formula 1)

[0085] with the compound of formula 2

[0086] (Formula 2)

[0087] Under the protection of nitrogen, the catalyst was reacted for 16 hours in the presence of tetrakis (triphenylphosphine) palladium to obtain the compound of general formula 3

[0088] (Formula 3);

[0089] 2) In the solvent tetrahydrofuran, under the protection of nitrogen, at -100 ° C ~ -50 ° C, the compound of the general formula 4

[0090] (Formula 4)

[0091] React with nBuLi to obtain the lithium reagent of general formula 5,

[0092] (Formula 5)

[0093] Then react the lithium reagent with the compound of the general formula 3 to obtain the compound represented by the general formula (I).

[0094] R in the above general formula (general formula 1, general formula 3, general formula 4 and general formula 5) 1 , R...

preparation example

[0096] The synthetic specific process steps of the prepared compound I-8-2 are as follows:

[0097] 1) Synthesis of lithium diisopropylamide (LDA)

[0098] Add 115ml of diisopropylamine and 100ml of tetrahydrofuran (THF) into a 1000ml three-necked flask, under nitrogen protection, add 320ml of n-butyllithium (n-BuLi, 2.4mol / L) dropwise under temperature control at 0°C~-20°C, after dropping, 0 Stir at ~-20°C for 1 hour to prepare LDA.

[0099] 2) Synthesis of trifluorovinyl zinc chloride

[0100]

[0101] Add 53g of anhydrous zinc chloride and 100ml of THF to a 1000ml three-necked bottle, protect it with nitrogen, cool down to -70°C, and feed 54g of 1,1,1,2-tetrafluoroethane gas, and control the temperature from -50°C to -70°C Slowly inject LDA under the liquid surface through the needle tube, and stir for 2 hours after the addition, to obtain trifluorovinyl zinc chloride.

[0102] 3) Synthetic compound of formula 6

[0103] (Formula 6)

[0104] (Formula 7)

[0105...

Embodiment 1

[0129] Prepare the liquid crystal composition of the present invention by each compound listed in Table 3 and the weight percentage, it is filled between the two substrates of the liquid crystal display for performance testing, and the test data are shown in the following table:

[0130] Table 3 liquid crystal composition formula and test performance thereof

[0131]

[0132] By comparing Example 1 and Comparative Example 1, it can be seen that the composition provided by the present invention has suitably high optical anisotropy, suitably high dielectric anisotropy, and a lower threshold voltage, so that the liquid crystal element has superior energy saving properties. Electrical performance, low viscosity, so that it can achieve fast response speed, so it is suitable for notebook computer equipment.

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Abstract

The invention provides a liquid crystal composition and application thereof. The liquid crystal composition comprises the following components in percentage by weight: 1 to 35 percent of a compound with the general formula (I), 1 to 50 percent of a compound with the general formula (II), 30 to 75 percent of a compound with the general formula (III), and 0 to 30 percent of a compound with the general formula (IV). The liquid crystal composition can be used in a liquid crystal element, and has the performances of high response speed and excellent power-saving property and properly high optical anisotropy.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a liquid crystal composition with faster response speed, superior power saving performance and appropriate high optical anisotropy and its application. Background technique [0002] For liquid crystal display elements, according to the display mode of liquid crystal, it is divided into PC (phase change, phase change), TN (twistnematic, twisted nematic), STN (super twisted nematic, super twisted nematic), ECB (electrically controlled birefringence, electrical controlled birefringence), OCB (optical compensated bend), IPS (in-plane switching, in-plane transition), VA (vertical alignment, vertical alignment) and other types. According to the driving method of the component, it is divided into PM (passive matrix, passive matrix) type and AM (active matrix, active matrix) type. PM is divided into static (static) and multiplex (multiplex) and other types. AM is divided into TFT (thin f...

Claims

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Application Information

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IPC IPC(8): C09K19/46C09K19/44G02F1/1333
Inventor 殷海涛韩文明吴凤丁文全胡娟
Owner JIANGSU HECHENG DISPLAY TECHCO
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