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Liquid crystal composition and display device thereof

a technology of liquid crystal composition and display device, which is applied in the direction of liquid crystal composition, chemistry apparatus and processes, instruments, etc., can solve the problems of low resistivity, long response time, and particularly important miscibility of components with one another, and achieve low viscosity, good high-temperature stability, and high clearing point

Active Publication Date: 2019-08-20
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a liquid crystal composition with suitable optical and dielectric anisotropies, a high clearing point, and a wide range of temperature where a nematic phase exists. The composition has low viscosity and good thermal stability, making it useful for liquid crystal displays. The display device has short response time and excellent display effect at high temperatures.

Problems solved by technology

Since the liquid crystals are generally used as a mixture of a plurality of components, miscibility of the components with one another becomes particularly important.
However, notorious drawbacks including long response time, low resistivity and excessively high operating voltage exist in the prior art, for example, in EP0673986, DE19528106, DE19528107.
Regardless of the means used, weakening of other performances of the LCD display is caused.
For example, changing the driving mode generally leads to increased cost of driver IC and more complex circuit; the power consumption is increased with increasing driving voltage; and decreasing the cell gap causes the complicated production process, uneven cell gap and other defects, and thus causes a decreased yield of the LCD display.
However, the performances of the liquid crystal materials are mutually constrained, and increase in the response speed will often decrease the clearing point, and cause the failure of the LCD screen in working in a high temperature environment.
The high and low temperature reliabilities are reduced, and the LCD display is caused to be unable to work at a low temperature in a serious case.

Method used

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  • Liquid crystal composition and display device thereof
  • Liquid crystal composition and display device thereof
  • Liquid crystal composition and display device thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0088]The liquid crystal composition of Example 1 was prepared with the compounds in percentages by weight shown in Table 3, and then filled between two substrates of an LCD display for performance test. The test data is shown in a table below.

[0089]

TABLE 3Formulation of liquid crystal composition andperformances testedTest resultCode ofType ofof performancecomponentcompoundContent, %parameters3CCVII-1-140Cp76.24CCVII-1-410Δn0.1165CCVII-1-610Δε5.03CPP2II-3-24γ1512PGP3II-4-14VHR (starting)98.5%2PGP4II-4-24VHR (150° C.)97.7%2PGP5II-4-343CCP1II-2-142PGUQPOCF3I-2-153PGUQPOCF3I-2-264PGUQPOCF3I-2-365PGUQPOCF3I-2-43In total100

example 2

[0090]The liquid crystal composition of Example 2 was prepared with the compounds in percentages by weight shown in Table 4, and then filled between two substrates of an LCD display for performance test. The test data is shown in a table below.

[0091]

TABLE 4Formulation of liquid crystal composition andperformances testedTest resultCode ofType ofof performancecomponentcompoundContent, %parameters3CCVII-1-140Cp80.04CCVII-1-410Δn0.1195CCVII-1-611Δε5.03CPP2II-3-23γ1542PGP3II-4-15VHR (starting)98.5%2PGP4II-4-24VHR (150° C.)98.1%V2PGP2II-4-743PGPC2III-2-223CPPC3III-1-222PGUQPOCF3I-2-153PGUQPOCF3I-2-264PGUQPOCF3I-2-343PGUQPCF3I-1-14In total100

example 3

[0092]The liquid crystal composition of Example 3 was prepared with the compounds in percentages by weight shown in Table 5, and then filled between two substrates of an LCD display for performance test. The test data is shown in a table below.

[0093]

TABLE 5Formulation of liquid crystal composition andperformances testedTest resultCode ofType ofof performancecomponentcompoundContent, %parameters3CCVII-1-140Cp81.54CCVII-1-410Δn0.1195CCVII-1-68Δε4.92PGP3II-4-15γ1572PGP4II-4-24VHR (starting)98.4%2PGP5II-4-34VHR (150° C.)98.1%3PGPC2III-2-22VCCP1II-2-472PGUQPOCF3I-2-163PGUQPOCF3I-2-254PGUQPOCF3I-2-345PGUQPOCF3I-2-45In total100

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Abstract

The present invention discloses a liquid crystal composition, comprising: at least a first compound selected from the group consisting of a compound of general Formula I-1, a compound of general Formula I-2, and a combination thereof, and at least a second compound selected from the group consisting of a compound of general Formula II-1, a compound of general Formula II-2, a compound of general Formula II-3, a compound of general Formula II-4 and a combination thereof. The liquid crystal composition provided in the present invention has the properties of appropriate optical and dielectric anisotropies, high clearing point, existence of a nematic phase over a wide range of temperature, low viscosity and good high-temperature stability. The liquid crystal composition is applicable to a liquid crystal display (LCD) device, to enable the LCD device to have such properties as short response time, excellent display effect at high temperature, and others.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a 371 application of an International PCT application serial no. PCT / CN2015 / 089170, filed on Sep. 8, 2015, which claims the priority benefits of China Application No. 201410481804.8, filed on Sep. 19, 2014. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention relates to a liquid crystal composition, and particularly to a liquid crystal composition having appropriate optical and dielectric anisotropies, high clearing point, fast response speed and good high-temperature stability, and to a liquid crystal display (LCD) comprising the liquid crystal composition.Description of Related Art[0003]The liquid crystal material is a mixture of organic rod-like small molecule compounds having both fluidity of a liquid and anisotropy of a crystal at a certain temperat...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02F1/1333C09K19/30C09K19/20C09K19/04C09K19/12
CPCC09K19/3003C09K19/20C09K2019/0466C09K2019/123C09K2019/3021C09K2019/3004C09K2019/3015C09K2019/3016C09K2019/301C09K19/42C09K19/12C09K19/30G02F1/13
Inventor HAN, WENMINGXU, HAIBINMA, DINGFULIU, QI
Owner JIANGSU HECHENG DISPLAY TECHCO
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