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Liquid crystal composition and display device comprising liquid crystal composition

A technology of liquid crystal composition and compound, which is applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, and can solve problems such as slow polymerization speed, uneven alignment, and poor display

Active Publication Date: 2015-06-03
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japanese patent JP2003193053 provides a polymeric liquid crystal composition with a lower melting point, but there is a serious problem of uneven alignment
U.S. Patent US6090308 provides a polymeric liquid crystal composition with a lower melting point, but there are problems such as poor stability and easy crystallization
[0014] In the prior art, a single polymerizable compound is generally used, so that various problems arise, such as: the polymerization speed is slow or fast, it is not easy to control, the residual amount after polymerization is too high, and various display problems may occur. Phenomena such as afterimages, display unevenness

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Each compound listed in table 2 and percentage by weight are formulated into liquid crystal composition LC-1, as shown in table 2:

[0083] Table 2 The formula of liquid crystal composition LC-1

[0084]

[0085] Add 0.4% of compound II-5 to 99.6% of liquid crystal composition LC-1, dissolve uniformly, and obtain mixture MLC-1.

[0086]

[0087] There is no difference between the physical parameters of MLC-1 and those of LC-1.

[0088] The physical parameters of MLC-1 are: Δn: 0.091, Δε: -3.4, Cp: 80.

[0089] Inject MLC-1 into a test box with a gap of 4 μm and a homeotropic alignment using the vacuum infusion method. While applying a square wave with a frequency of 60 Hz and a driving voltage of 16 V, the test box is irradiated with ultraviolet rays by a high-pressure mercury ultraviolet lamp. , adjust the irradiation intensity to the surface of the box to be 30mW / cm 2 , irradiated for 360 seconds to obtain a vertically aligned liquid crystal display element a...

Embodiment 2

[0099] Test the pretilt angle and polymeric compound residual data of embodiment 1 and comparative example 1, experimental result is as shown in table 4 and table 5:

[0100] Table 4 Pretilt angle before and after UV light irradiation

[0101]

[0102] Polymer residue in the liquid crystal composition of table 5

[0103] UV polymerization time (s)

[0104] From the comparative data in Table 4 and Table 5, it can be seen that the liquid crystal composition of the present invention has better alignment effect, faster polymer rate, more complete polymerization, and lower residue, thereby greatly improving the problem of poor display. .

Embodiment 3

[0106] Each compound listed in table 6 and percentage by weight are formulated into liquid crystal composition LC-3, as shown in table 6:

[0107] Table 6 The formula of liquid crystal composition LC-3

[0108]

[0109] Add 0.4% of compound II-5 to 99.6% of the liquid crystal composition LC-3, dissolve uniformly, and obtain the mixture MLC-3.

[0110]

[0111] There is no difference between the physical parameters of MLC-3 and those of LC-3.

[0112] The physical parameters of MLC-3 are: Δn: 0.105, Δε: -2.8, Cp: 75.2.

[0113] Inject MLC-3 into a test box with a gap of 4 μm and a homeotropic alignment using a vacuum infusion method. While applying a square wave with a frequency of 60 Hz and a driving voltage of 16 V, the test box is irradiated with ultraviolet rays by a high-pressure mercury ultraviolet lamp. , adjust the irradiation intensity to the surface of the box to be 30mW / cm 2 , irradiated for 360 seconds to obtain a vertically aligned liquid crystal display e...

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Abstract

The invention provides a liquid crystal composition which comprises at least one compound disclosed as general formula I as a first component, at least one compound disclosed as general formula II as a second component, at least one compound disclosed as general formula III as a third component, and at least one compound disclosed as general formula IV as a fourth component. The liquid crystal composition can control the polymerization rate, lower the polymer compound residues and greatly reduce the risks of display defectiveness problems, such as image ghost, nonuniform image display and the like. The invention also provides a liquid crystal display device comprising the liquid crystal composition.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a liquid crystal composition containing a polymerizable compound and its application in liquid crystal display devices. Background technique [0002] Liquid crystal display elements can be used in various home appliances represented by clocks and electronic calculators, measuring equipment, automotive panels, word processors, computers, printers, televisions, and the like. As the night scene display method, PC (phase change, phase change), TN (twist nematic, twisted nematic), STN (super twisted nematic, super twisted nematic), ECB (electrically controlled birefringence, electronically controlled birefringence), OCB (optical compensated bend, optically compensated bending), IPS (in-plane switching, coplanar transition), VA (vertical alignment, vertical alignment), CSH (color super homeotropic, color super vertical plane ) and other class patterns. According to the driving method o...

Claims

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Application Information

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IPC IPC(8): C09K19/44C09K19/30G02F1/1333
Inventor 马文阳韩文明李鹏飞陈晶晶毛良良
Owner JIANGSU HECHENG DISPLAY TECHCO
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