CN104560054B - Liquid crystal composition and liquid crystal display device - Google Patents
Liquid crystal composition and liquid crystal display device Download PDFInfo
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- CN104560054B CN104560054B CN201310499408.3A CN201310499408A CN104560054B CN 104560054 B CN104560054 B CN 104560054B CN 201310499408 A CN201310499408 A CN 201310499408A CN 104560054 B CN104560054 B CN 104560054B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 147
- 239000000203 mixture Substances 0.000 title claims abstract description 126
- 150000001875 compounds Chemical class 0.000 claims abstract description 89
- 125000000217 alkyl group Chemical group 0.000 claims description 14
- 125000004432 carbon atom Chemical group C* 0.000 claims description 13
- 125000003342 alkenyl group Chemical group 0.000 claims description 5
- 125000003302 alkenyloxy group Chemical group 0.000 claims description 3
- 125000003545 alkoxy group Chemical group 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 8
- 230000003287 optical effect Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 27
- 239000000758 substrate Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000009472 formulation Methods 0.000 description 3
- 0 CCC(*)C(CC1)CCC1C(CC1)CCC1c1ccc(**)cc1 Chemical compound CCC(*)C(CC1)CCC1C(CC1)CCC1c1ccc(**)cc1 0.000 description 2
- 230000006750 UV protection Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- PBIFTROFCZATFC-UHFFFAOYSA-N CCC(CC1)CCC1C(CC1)CCC1c(cc1)ccc1OC(F)(F)F Chemical compound CCC(CC1)CCC1C(CC1)CCC1c(cc1)ccc1OC(F)(F)F PBIFTROFCZATFC-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Landscapes
- Liquid Crystal Substances (AREA)
Abstract
The invention provides a liquid crystal composition. The liquid crystal composition comprises one or more compounds with the general formula I, accounting for 10-60% of the total weight of the liquid crystal composition, one or more compounds with the general formula II, accounting for 15-40% of the total weight of the liquid crystal composition, one or more compounds with the general formula III, accounting for 5-25% of the total weight of the liquid crystal composition, one or more compounds with the general formula IV, accounting for 5-30% of the total weight of the liquid crystal composition, and one or more compounds with the general formula V-1 and/ or V-2, accounting for 0-20% of the total weight of the liquid crystal composition. The liquid crystal composition has a relatively high clearing point, properly high dielectric anisotropy, properly high optical anisotropy, a relatively fast response speed, a relatively high voltage holding ratio and good ultraviolet-resistant stability, and is suitable for FFS and other display modes. The invention further provides a liquid crystal display device comprising the liquid crystal composition.
Description
Technical Field
The invention relates to a liquid crystal composition, in particular to a liquid crystal composition with higher clearing point, proper large dielectric anisotropy, proper high optical anisotropy, higher response speed, better voltage holding ratio and good ultraviolet light resistance stability and application thereof in a liquid crystal display device.
Background
A liquid crystal display (liquid crystal display) is a display utilizing electro-optical change of liquid crystal, and has attractive advantages of small size, light weight, low power consumption, and good display quality, and thus has become a mainstream of a flat panel display in recent years. The electro-optical modes used in the conventional liquid crystal display are, for example, a Twisted Nematic (TN), a Super Twisted Nematic (STN), an Optically Compensated Bend (OCB), and an Electrically Controlled Birefringence (ECB) mode, and various modifications thereof. All of these modes use an electric field which is substantially perpendicular to the substrate or to the liquid crystal layer, and besides these modes, there are also electro-optical modes which use an electric field which is substantially parallel to the substrate or to the liquid crystal layer, such as in-plane switching modes.
For such displays, new liquid crystalline media with improved properties are needed. In particular, for many types of applications, the liquid-crystalline medium comprising the liquid-crystalline composition must have a suitable nematic phase temperature range, a suitable birefringence, a high voltage holding ratio, low power consumption, a low rotational viscosity and good low-temperature storability.
Liquid crystal compositions suitable for LCDs and in particular for TFT displays are known, for example, from JP07-181439(A), EP0667555, EP0673986, DE19509410, DE19528106, DE19528107, WO9623851 and WO 9628521. However, these liquid crystal compositions have significant disadvantages. Most of them, among other drawbacks, lead to disadvantageously long response times, have too low a resistivity and require too high an operating voltage. In addition, many of the existing liquid crystal materials are not particularly stable when stored at low temperatures.
Therefore, in the field of liquid crystal materials, liquid crystal compositions having properties required for practical use, such as a wide nematic phase range, suitable optical anisotropy, high voltage holding ratio, good ultraviolet resistance, and a fast response speed, are particularly required.
Disclosure of Invention
The invention aims to provide a liquid crystal composition which has the characteristics of higher clearing point, appropriately large dielectric anisotropy, appropriately high optical anisotropy, relatively high response speed, relatively good voltage holding ratio, good ultraviolet resistance stability and the like, and is suitable for display modes such as FFS (fringe field switching) and the like.
One aspect of the present invention provides a liquid crystal composition comprising:
one or more compounds with the general formula I accounting for 10-60 percent of the total weight of the liquid crystal composition
15-40% of one or more compounds of formula II based on the total weight of the liquid crystal composition
One or more compounds of the general formula III accounting for 5-25% of the total weight of the liquid crystal composition
One or more compounds of the general formula IV accounting for 5-30% of the total weight of the liquid crystal composition
And
0-20% of one or more compounds of general formula V-1 and/or V-2 by weight of the total liquid crystal composition
Wherein,
R1、R7and R9The same or different, each independently represents an alkyl group having 1 to 5 carbon atoms;
R2、R3、R4and R8The alkyl groups may be the same or different and each independently represents an alkyl group having 2 to 5 carbon atoms;
R5and R6The same or different, each independently represents an alkenyl group having 2 to 4 carbon atoms;
and the compounds of the general formula I and the general formula II account for 40-85% of the total weight of the liquid crystal composition.
The liquid crystal composition further comprises:
one or more compounds of the general formula VI accounting for 0-10 percent of the total weight of the liquid crystal composition
And
0-20% of one or more compounds of formula VII, based on the total weight of the liquid crystal composition
Wherein,
R10and R11The same or different, each independently represents an alkyl group or an alkoxy group having 1 to 7 carbon atoms, or an alkenyl group or an alkenyloxy group having 2 to 7 carbon atoms.
In some embodiments of the present invention, it is preferred that the compound of formula I comprises 15 to 35% by weight of the total liquid crystal composition; the compound of the general formula II accounts for 15-40% of the total weight of the liquid crystal composition; the compound of the general formula III accounts for 5-20% of the total weight of the liquid crystal composition; the compound of the general formula IV accounts for 5-20% of the total weight of the liquid crystal composition; the compound of the general formula V-1 and/or V-2 accounts for 3-15% of the total weight of the liquid crystal composition; the compound of the general formula VI accounts for 0 to 10 percent of the total weight of the liquid crystal composition; and the compound of the general formula VII accounts for 0-15% of the total weight of the liquid crystal composition.
In some embodiments of the invention, R is10And R11The alkyl groups may be the same or different and each independently represents an alkyl group having 1 to 7 carbon atoms.
Another aspect of the present invention provides a liquid crystal display device comprising the liquid crystal composition according to the present invention.
According to the invention, through combination experiments on the compounds, and comparison with a control, the liquid crystal medium comprising the liquid crystal composition is determined to have the characteristics of smaller viscosity, good low-temperature stability, large dielectric anisotropy, high voltage holding ratio and good ultraviolet stability.
In the present invention, unless otherwise specified, the proportions are weight ratios, all temperatures are in degrees centigrade, and the thickness of the box selected for the response time data test is 7 μm.
Detailed Description
The invention will be illustrated below with reference to specific embodiments. It should be noted that the following examples are illustrative of the present invention, and are not intended to limit the present invention. Other combinations and various modifications within the spirit or scope of the present invention may be made without departing from the spirit or scope of the present invention.
For convenience of expression, in the following examples, the group structure of the liquid crystal composition is represented by the code listed in Table 1:
TABLE 1 radical structural code of liquid crystal compounds
Compounds of the following formula are exemplified:
the structural formula is represented by the code listed in Table 1, and can be expressed as: nCCGF, wherein n in the code represents the number of C atoms of the left alkyl group, for example, n is 3, namely, the alkyl group is-C3H7(ii) a C in the code represents cyclohexylAn alkyl group.
Compounds of the following formula are exemplified:
the structural formula is represented by the codes listed in table 1, and can be represented as follows: v2CCP 1.
The abbreviated codes of the test items in the following examples are as follows:
wherein the refractive index anisotropy is measured by using an Abbe refractometer under a sodium lamp (589 nm) light source at 20 ℃; the dielectric test cell was of the type TN90, the cell thickness being 7 μm.
The response time is measured by using a DMS505 tester at 25 ℃; the test box is of TN left-handed type, the box thickness is 7 μm, and the test voltage is 8V.
VHR (60 ℃) was measured using a TOY06254 type liquid crystal physical property evaluation system; the testing temperature is 60 ℃, and the testing time is 16.6 ms; VHR (UV, 60 ℃) was measured using a TOY06254 type liquid crystal physical property evaluation system; the test temperature is 60 ℃, the test time is 16.6ms, and the sun illumination time is 8 h.
The components used in the following examples can be synthesized by a known method or obtained commercially. These synthesis techniques are conventional, and the resulting liquid crystal compounds were tested to meet the standards for electronic compounds.
Liquid crystal compositions were prepared according to the compounding ratios of the liquid crystal compositions specified in the following examples. The liquid crystal composition is prepared according to the conventional method in the field, such as heating, ultrasonic wave, suspension and the like, and is mixed according to the specified proportion.
Liquid crystal compositions given in the following examples were prepared and studied. The composition of each liquid crystal composition and the results of the performance parameter test thereof are shown below.
Comparative example 1
The liquid crystal composition of comparative example 1, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared according to the compounds and weight percentages listed in table 2, and the test data are shown in the following table:
TABLE 2 liquid crystal composition formulations and their test properties
Comparative example 2
The liquid crystal composition of comparative example 2, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared according to the compounds and weight percentages listed in table 3, and the test data are shown in the following table:
TABLE 3 liquid crystal composition formula and its test performance
Example 1
The liquid crystal composition of example 1 was prepared according to the compounds and weight percentages listed in table 4, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 4 liquid crystal composition formula and its test performance
Example 2
The liquid crystal composition of example 2 was prepared according to the compounds and weight percentages listed in table 5, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 5 liquid crystal composition formulations and their test properties
Example 3
The liquid crystal composition of example 3 was prepared according to the compounds and weight percentages listed in table 6, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 6 liquid crystal composition formula and its test performance
Example 4
The liquid crystal composition of example 4 was prepared according to the compounds and weight percentages listed in table 7, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 7 liquid crystal composition formulations and their test properties
Referring to comparative example 1 and comparative example 2, as can be seen from the test data of the above examples 1, 2, 3 and 4, the liquid crystal composition provided by the present invention has a faster response speed, a better voltage holding ratio and a better stability against ultraviolet light, and is suitable for liquid crystal display devices such as FFS.
Claims (3)
1. A liquid crystal composition comprising:
15-35% of one or more compounds of formula I based on the total weight of the liquid crystal composition
15-40% of one or more compounds of formula II based on the total weight of the liquid crystal composition
One or more compounds of the general formula III accounting for 5-20% of the total weight of the liquid crystal composition
One or more compounds of the general formula IV accounting for 5-20% of the total weight of the liquid crystal composition
And
one or more compounds of general formula V-1 and/or V-2 accounting for 3-15% of the total weight of the liquid crystal composition
Wherein,
R1、R7and R9The same or different, each independently represents an alkyl group having 1 to 5 carbon atoms;
R2、R3、R4and R8The alkyl groups may be the same or different and each independently represents an alkyl group having 2 to 5 carbon atoms;
R5and R6The same or different, each independently represents an alkenyl group having 2 to 4 carbon atoms;
and the compounds of the general formula I and the general formula II account for 40-85% of the total weight of the liquid crystal composition;
one or more compounds of the general formula VI accounting for 0-10 percent of the total weight of the liquid crystal composition
Wherein,
R10represents an alkyl group or an alkoxy group having 1 to 7 carbon atoms, or the number of carbon atomsIs 2-7 alkenyl or alkenyloxy.
0-15% of one or more compounds of formula VII, based on the total weight of the liquid crystal composition
Wherein,
R11represents an alkyl group or an alkoxy group having 1 to 7 carbon atoms, or an alkenyl group or an alkenyloxy group having 2 to 7 carbon atoms.
2. The liquid crystal composition of claim 1, wherein the liquid crystal composition comprises:
15% by weight of a compound based on the total weight of the liquid crystal composition
11% by weight of a compound based on the total weight of the liquid crystal composition
15% by weight of a compound based on the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
6 percent of compound in the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
A compound accounting for 23 percent of the total weight of the liquid crystal composition
And
a compound accounting for 5 percent of the total weight of the liquid crystal composition
Alternatively, the liquid crystal composition comprises:
15% by weight of a compound based on the total weight of the liquid crystal composition
A compound accounting for 10 percent of the total weight of the liquid crystal composition
6 percent of compound in the total weight of the liquid crystal composition
6 percent of compound in the total weight of the liquid crystal composition
6 percent of compound in the total weight of the liquid crystal composition
6 percent of compound in the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
18% by weight of the total liquid crystal composition
6 percent of compound in the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
And
a compound accounting for 7 percent of the total weight of the liquid crystal composition
Alternatively, the liquid crystal composition comprises:
a compound accounting for 8 percent of the total weight of the liquid crystal composition
A compound accounting for 14 percent of the total weight of the liquid crystal composition
A compound accounting for 8 percent of the total weight of the liquid crystal composition
11% by weight of a compound based on the total weight of the liquid crystal composition
A compound accounting for 7 percent of the total weight of the liquid crystal composition
A compound accounting for 8 percent of the total weight of the liquid crystal composition
A compound accounting for 7 percent of the total weight of the liquid crystal composition
A compound accounting for 8 percent of the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
A compound accounting for 10 percent of the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal compositionAnd
a compound accounting for 9 percent of the total weight of the liquid crystal composition
Alternatively, the liquid crystal composition comprises:
15% by weight of a compound based on the total weight of the liquid crystal composition
A compound accounting for 7 percent of the total weight of the liquid crystal composition
A compound accounting for 10 percent of the total weight of the liquid crystal composition
A compound accounting for 4 percent of the total weight of the liquid crystal composition
6 percent of compound in the total weight of the liquid crystal composition
A compound accounting for 4 percent of the total weight of the liquid crystal composition
6 percent of compound in the total weight of the liquid crystal composition
A compound accounting for 3 percent of the total weight of the liquid crystal composition
A compound accounting for 3 percent of the total weight of the liquid crystal composition
17% by weight of the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
A compound accounting for 5 percent of the total weight of the liquid crystal composition
And
a compound accounting for 5 percent of the total weight of the liquid crystal composition
3. A liquid crystal display device comprising the liquid crystal composition of claim 1.
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| WO2006038522A1 (en) * | 2004-10-04 | 2006-04-13 | Chisso Corporation | Tetrahydropyran compounds, liquid crystal compositions, and liquid crystal displays containing the compositions |
| CN101031631B (en) * | 2004-10-04 | 2013-02-13 | Jnc株式会社 | Liquid crystal composition and liquid crystal display element |
| US7563492B2 (en) * | 2005-11-16 | 2009-07-21 | Chisso Corporation | Liquid crystal composition and liquid crystal display device |
| CN101665701B (en) * | 2009-09-25 | 2012-12-12 | 北京八亿时空液晶科技股份有限公司 | Nematic liquid crystal composition |
| CN102994098B (en) * | 2012-05-03 | 2014-12-24 | 石家庄诚志永华显示材料有限公司 | TFT (Thin Film Transistor) liquid crystal composition and preparation method and application thereof |
| CN103224799B (en) * | 2013-04-16 | 2014-12-17 | 西安彩晶光电科技股份有限公司 | Liquid crystal composition |
| CN103265959B (en) * | 2013-06-09 | 2015-06-03 | 石家庄诚志永华显示材料有限公司 | TFT (Thin Film Transistor) liquid crystal composite |
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Address after: 212212 Yangtze River bridge, Jiangsu, Yangzhong, Yangzhong on the eastern side of the road Patentee after: JIANGSU HECHENG DISPLAY TECHNOLOGY Co.,Ltd. Address before: 212212 Yangtze River bridge, Jiangsu, Yangzhong, Yangzhong on the eastern side of the road Patentee before: Jiangsu Hecheng Display Technology Co.,Ltd. |
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Address after: 2/F, Sino Japan Cooperation Innovation Park, No. 16 Zidan Road, Qinhuai District, Nanjing, Jiangsu Province, 210014 Patentee after: JIANGSU HECHENG DISPLAY TECHNOLOGY Co.,Ltd. Address before: 212212 East Side of Yangzhong Yangtze River Bridge, Zhenjiang City, Jiangsu Province Patentee before: JIANGSU HECHENG DISPLAY TECHNOLOGY Co.,Ltd. |
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