Liquid crystal composition and liquid crystal display device comprising same

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

Active Publication Date: 2015-02-04
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 higher clearing point, a wider 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 low clearing point, 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 comprising same
  • Liquid crystal composition and liquid crystal display device comprising same
  • Liquid crystal composition and liquid crystal display device comprising same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0075] Preparation of compounds of general formula (I)

[0076] 1) In the solvent tetrahydrofuran, at room temperature, the compound of general formula 1

[0077] (Formula 1)

[0078] with the compound of formula 2

[0079] (Formula 2)

[0080] 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

[0081] (Formula 3);

[0082] 2) In the solvent tetrahydrofuran, under the protection of nitrogen, at -100 ° C ~ -50 ° C, the compound of the general formula 4

[0083] (Formula 4)

[0084] React with nBuLi to obtain the lithium reagent of general formula 5,

[0085] (Formula 5)

[0086] Then react the lithium reagent with the compound of the general formula 3 to obtain the compound represented by the general formula (I).

[0087] R in the above general formula (general formula 1, general formula 3, general formula 4 and general formula 5) 1 , R...

preparation example

[0089] The synthetic specific process steps of the prepared compound I-8-2 are as follows:

[0090] 1) Synthesis of lithium diisopropylamide (LDA)

[0091] Add 115mL of diisopropylamine and 100mL of tetrahydrofuran (THF) into a 1000mL three-necked flask, under nitrogen protection, add 320 mL of n-butyllithium (n-BuLi, 2.4 mol / L) dropwise under temperature control at 0°C~-20°C, and dropwise, Stir at 0~-20°C for 1 hour to prepare LDA.

[0092] 2) Synthesis of trifluorovinyl zinc chloride

[0093]

[0094]Add 53g of anhydrous zinc chloride and 100mL THF to a 1000mL three-necked flask, protect it with nitrogen, cool down to -70°C, inject 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.

[0095] 3) Synthetic compound of formula 6

[0096] (Formula 6)

[0097] (Formula 7)

[0098] The co...

Embodiment 1

[0122] 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:

[0123] Table 3 liquid crystal composition formula and test performance thereof

[0124]

[0125] By comparing Example 1 and Comparative Example 1, it can be seen that the composition provided by the present invention has a higher clearing point, which can be used in high-temperature equipment, and has high optical anisotropy and appropriate high dielectric anisotropy opposite sex.

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PUM

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Abstract

The invention provides a liquid crystal composition and application thereof. The liquid crystal composition comprises a compound which has a general formula (I) and accounts for 5-35 percent of the total weight of the liquid crystal composition, a compound which has a general formula (II) and accounts for 1-35 percent of the total weight of the liquid crystal composition, a compound which has a general formula (III) and accounts for 40-85 percent of the total weight of the liquid crystal composition and a compound which has a general formula (IV) and accounts for 1-35 percent of the total weight of the liquid crystal composition. The liquid crystal composition has the advantages of extremely high clearing point, high refractive index, high low-temperature storage stability and performance suitable for high optical anisotropy. The liquid crystal composition is used for a liquid crystal element, the image display effect is good, and a smear phenomenon is avoided.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a liquid crystal composition with fast response speed, good low-temperature storage stability and appropriate high optical anisotropy and its application. Background technique [0002] Liquid crystal material is a mixture of organic rod-shaped small molecular compounds that have both fluidity of liquid and anisotropy of crystal at a certain temperature. Because of the characteristics of optical anisotropy and dielectric anisotropy, liquid crystal materials are widely used in liquid crystal display components of electronic calculators, automobile instruments, televisions, computers and other devices. According to the classification of liquid crystal display, the liquid crystal composition can be divided into twisted nematic type (TN type), super twisted nematic type (STN type), thin film transistor type (TFT type), guest-host type (GH type), dynamic scattering type ( DS type) and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/44G02F1/1333
Inventor 胡娟韩文明吴凤殷海涛丁文全
Owner JIANGSU HECHENG DISPLAY TECHCO
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