CN108239547B - Liquid crystal composition with negative dielectric anisotropy and display device thereof - Google Patents

Liquid crystal composition with negative dielectric anisotropy and display device thereof Download PDF

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CN108239547B
CN108239547B CN201611203798.5A CN201611203798A CN108239547B CN 108239547 B CN108239547 B CN 108239547B CN 201611203798 A CN201611203798 A CN 201611203798A CN 108239547 B CN108239547 B CN 108239547B
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liquid crystal
crystal composition
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CN108239547A (en
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王盼盼
陈昭远
韩文明
徐海彬
马文阳
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Jiangsu Hecheng Display Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
    • C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods

Abstract

The invention discloses a negative poleA liquid crystal composition of dielectric anisotropy, the liquid crystal composition comprising: 30-70% of one or more compounds of general formula I and/or II based on the total weight of the negative liquid crystal composition; 8-30% by weight of the total negative liquid crystal composition of one or more compounds of formula III; 0-30% by weight of the total negative liquid crystal composition of one or more compounds of formula IV; and 20-50% of one or more compounds of formula V, based on the total weight of the negative liquid crystal composition. The invention also discloses a liquid crystal display device comprising the liquid crystal composition.

Description

Liquid crystal composition with negative dielectric anisotropy and display device thereof
Technical Field
The present invention relates to a liquid crystal composition, and more particularly, to a liquid crystal composition having characteristics such as large dielectric anisotropy in absolute value, a wide nematic phase temperature range, a low driving voltage, good low-temperature stability, a high clearing point, and high optical anisotropy, and a liquid crystal display device including the same.
Background
Liquid crystal display devices have been used in various household electric appliances, measuring devices, panels for automobiles, word processors, electronic notepads, printers, computers, televisions, and the like, from clocks and calculators. Representative liquid crystal display modes include TN (twisted nematic) mode, STN (super twisted nematic) mode, DS (dynamic light scattering) mode, GH (guest host) mode, IPS (in-plane switching) mode, OCB (optically compensated birefringence) mode, ECB (voltage controlled birefringence) mode, VA (vertically aligned) mode, CSH (color super vertical) mode, FLC (ferroelectric liquid crystal) mode, and the like. Further, as a driving method of the liquid crystal display device, a static driving, a multiplex driving, a simple matrix method, an Active Matrix (AM) method of driving by a TFT (thin film transistor), a TFD (thin film diode), or the like can be given.
Among these display systems, the IPS mode, ECB mode, VA mode, CSH mode, and the like have a characteristic of using a liquid crystal composition having a negative dielectric anisotropy Δ ∈. Among these display systems, the VA display system driven by AM is used for display elements (for example, televisions) which require high-speed response and a wide viewing angle.
Liquid crystal materials need to have suitably high dielectric anisotropy, optical anisotropy, and good low-temperature mutual solubility and thermal stability. In addition, the liquid crystal material should also have low viscosity and short response time, low threshold voltage and high contrast. The anisotropy of the composition is further described with reference to a commercially available liquid crystal display device. The temperature range of the nematic phase is associated with the operating temperature range of the element. The upper limit temperature of the nematic phase is preferably 70 ℃ or higher, and the lower limit temperature of the nematic phase is preferably-10 ℃ or lower. The viscosity of the composition correlates to the response time of the element. In order to display animation in the element, it is preferable that the response time of the element is short. Therefore, it is preferable that the viscosity of the composition is small, and it is more preferable that the viscosity of the composition is small at a low temperature.
The optical anisotropy of the composition correlates with the contrast of the element. In order to maximize the contrast ratio of the liquid crystal display element, the product value (Δ n × d) of the optical anisotropy (Δ n) of the liquid crystal composition and the thickness (d) of the liquid crystal layer may be designed to be a fixed value. The appropriate product value depends on the kind of operation mode. A suitable value for an element like TN mode is about 0.45 μm. In this case, a composition having a large optical anisotropy is preferable for an element having a small liquid crystal layer thickness.
A liquid crystal display element containing a liquid crystal composition having a large absolute value of dielectric anisotropy can reduce the base voltage value, reduce the driving voltage, and further reduce the power consumption.
The liquid crystal display element containing the liquid crystal composition with lower threshold voltage can effectively reduce the power consumption of display, and has longer endurance time particularly in consumables and portable electronic products such as mobile phones and tablet computers.
The liquid crystal composition with low viscosity can improve the response speed of the liquid crystal display element. When the response speed of the liquid crystal display element is high, the liquid crystal display element is applicable to animation display. Further, when the liquid crystal composition is injected into the liquid crystal cell of the liquid crystal display element, the injection time can be shortened, and the workability can be improved.
On the other hand, the viscosity of the liquid crystal material affects the yield of the product during the manufacturing process, and when the viscosity of the liquid crystal material is high, the liquid crystal material is not well diffused, which easily causes uneven display of the device during the manufacturing process of the liquid crystal display device, thereby affecting the yield of the display device and affecting the display quality.
The prior art discloses a liquid crystal composition with low power consumption and fast response, such as patent document CN102858918A, but the prior art has environmental problems (such as use of chlorine-containing compounds), short service life (such as poor UV or thermal stability), low contrast (such as whitening of display screen under sunlight), and cannot balance the performance balance problems of requiring appropriate optical anisotropy, appropriate dielectric anisotropy, high voltage holding ratio, UV stability and high temperature stability in lcd televisions, tablet computers, etc., and cannot simultaneously satisfy all the indexes.
From the preparation angle of the liquid crystal material, various performances of the liquid crystal material are mutually influenced by the influence, and other performances may be changed by the improvement of a certain performance index. Therefore, creative efforts are often required to prepare liquid crystal materials having suitable properties in all aspects.
The liquid crystal material is an important component of the liquid crystal display, and the liquid crystal display has great market demand at present, is mostly used in electronic and electric products, but has a short life cycle. The problem of waste pollution naturally exists in a short life cycle, and under the condition that the current green environmental protection problem is increasingly emphasized by various social circles, if the problem can be controlled from a source, namely, an environment-friendly green material is selected in the modulation process of the liquid crystal material, the environmental cost for treating the waste liquid crystal display can be greatly reduced. Therefore, creative labor is often needed to prepare the liquid crystal material with proper performance in all aspects, economy and environmental protection.
Disclosure of Invention
The invention aims to provide a liquid crystal composition with negative dielectric anisotropy, which has the characteristics of large absolute dielectric anisotropy, wider nematic phase temperature range, low driving voltage, good low-temperature stability, higher clearing point, higher optical anisotropy and the like, particularly has low viscosity, reduces the defects in an ODF (optical domain flow) process, and therefore, a display device comprising the liquid crystal composition has higher response speed and has higher yield in a process.
It is another object of the present invention to provide a display device comprising the liquid crystal composition of negative dielectric anisotropy.
In order to accomplish the above object of the invention, the present invention provides a liquid crystal composition having negative dielectric anisotropy, comprising:
30-70% of one or more compounds of general formula I and/or II based on the total weight of the negative liquid crystal composition
Figure BDA0001189586290000021
8-30% of one or more compounds of formula III, based on the total weight of the negative liquid crystal composition
Figure BDA0001189586290000031
One or more compounds of formula IV in an amount of 0-30% by weight based on the total weight of the negative liquid crystal composition
Figure BDA0001189586290000032
And
20-50% of one or more compounds of formula V, based on the total weight of the negative liquid crystal composition
Figure BDA0001189586290000033
Wherein the content of the first and second substances,
R1、R2、R3、R4、R5、R6、R7and R8The two substituents are the same or different and each independently represent-H, -F, a linear or branched halogenated or unhalogenated alkyl or alkoxy group having 1 to 12 carbon atoms, a linear or branched halogenated or unhalogenated alkenyl or alkenyloxy group having 2 to 12 carbon atoms;
Figure BDA0001189586290000034
are the same or different and each independently represents
Figure BDA0001189586290000035
Or
Figure BDA0001189586290000036
The above-mentioned
Figure BDA0001189586290000037
One or more H atoms in (a) may be substituted by F atoms;
x represents-CH2O-、-CH2 CH2-, -COO-, -is identical to or a single bond;
a represents 0, 1 or 2, wherein, when a is 0, a ring
Figure BDA0001189586290000038
Is not simultaneously represented
Figure BDA0001189586290000039
When a is 2, 2 rings
Figure BDA00011895862900000310
May be the same or different;
n represents 0 or 1.
In some embodiments of the invention, it is preferred that R is1、R2、R3、R4、R5、R6、R7And R8The same or different, each independently represents a linear or branched, halogenated or unhalogenated alkyl or alkoxy group having 1 to 5 carbon atoms, or the number of carbon atoms2 to 5 linear or branched halogenated or unhalogenated alkenyl or alkenyloxy; further preferably said R1、R2、R3、R4、R5、R6、R7And R8The alkyl or alkoxy groups are the same or different and each independently represents a C1-5 linear or branched halogenated or unhalogenated alkyl or alkoxy group, or a C2-5 linear or branched halogenated or unhalogenated alkenyl group; the R is4Independently represents a linear or branched alkyl group having 1 to 5 carbon atoms.
In some embodiments of the invention, it is preferred that the
Figure BDA00011895862900000311
Are the same or different and each independently represents
Figure BDA00011895862900000312
The above-mentioned
Figure BDA00011895862900000313
May be substituted by a F atom, wherein
Figure BDA00011895862900000314
Wherein one or more H atoms may be substituted with F atoms, wherein the substitution positions are not adjacent.
In some embodiments of the present invention, it is preferred that the compound of formula I and/or II comprises 25-65% by weight of the total negative liquid crystal composition; the compound of the general formula III accounts for 8-25% of the total weight of the negative liquid crystal composition; the compound of the general formula IV accounts for 0 to 25 percent of the total weight of the negative liquid crystal composition; and the compound of the general formula V accounts for 20-45% of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compound of formula I and/or II comprises 30-60% by weight of the total negative liquid crystal composition; the compound of the general formula III accounts for 8-25% of the total weight of the negative liquid crystal composition; the compound of the general formula IV accounts for 1 to 25 percent of the total weight of the negative liquid crystal composition; and the compound of the general formula V accounts for 20-35% of the total weight of the negative liquid crystal composition.
In some embodiments of the invention, it is preferred that the compound of formula i is selected from the group consisting of:
Figure BDA0001189586290000041
Figure BDA0001189586290000051
in some embodiments of the present invention, it is particularly preferred that the compound of formula i is selected from the group consisting of:
Figure BDA0001189586290000052
in some embodiments of the present invention, the compound of formula I preferably comprises from 0 to 35%, more preferably from 15 to 35% by weight of the total negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compound of formula ii is selected from the group consisting of:
Figure BDA0001189586290000053
Figure BDA0001189586290000061
in some embodiments of the present invention, it is particularly preferred that the compound of formula ii is selected from the group consisting of:
Figure BDA0001189586290000062
Figure BDA0001189586290000071
in some embodiments of the present invention, it is preferred that the compound of formula II comprises 10 to 35% by weight of the total negative liquid crystal composition; more preferably 15 to 35%.
In some embodiments of the present invention, it is preferred that the compound of formula iv is selected from the group consisting of:
Figure BDA0001189586290000072
wherein the content of the first and second substances,
R5and R6The same or different, each independently represents a linear or branched alkyl group or alkoxy group having 1 to 12 carbon atoms, an alkenyl group or alkenyloxy group having 2 to 12 carbon atoms.
In some embodiments of the present invention, it is particularly preferred that the compound of formula iv is selected from the group consisting of:
Figure BDA0001189586290000073
wherein the content of the first and second substances,
R5and R6The same or different, each independently represents a linear or branched alkyl group or alkoxy group having 1 to 12 carbon atoms, an alkenyl group or alkenyloxy group having 2 to 12 carbon atoms.
In some embodiments of the present invention, it is preferred that the compound of formula IV-1 is selected from the group consisting of:
Figure BDA0001189586290000081
Figure BDA0001189586290000091
in some embodiments of the present invention, it is preferred that the compound of formula IV-2 is selected from the group consisting of:
Figure BDA0001189586290000092
Figure BDA0001189586290000101
in some embodiments of the present invention, it is preferred that the compound of formula IV-3 is selected from the group consisting of:
Figure BDA0001189586290000102
Figure BDA0001189586290000111
in some embodiments of the present invention, it is preferred that the compound of formula IV-4 is selected from the group consisting of:
Figure BDA0001189586290000112
Figure BDA0001189586290000121
in some embodiments of the present invention, it is preferred that the compound of formula IV-5 is selected from the group consisting of:
Figure BDA0001189586290000122
Figure BDA0001189586290000131
in some embodiments of the present invention, preferably, the compound of formula v is selected from one or more compounds in the group consisting of:
Figure BDA0001189586290000132
Figure BDA0001189586290000141
wherein the content of the first and second substances,
R7and R8The same or different, each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms.
In some embodiments of the present invention, preferably, the compound of formula v-1 is selected from one or more compounds of the group consisting of:
Figure BDA0001189586290000142
Figure BDA0001189586290000151
in some embodiments of the present invention, it is preferred that the compound of formula V-1 comprises from 10 to 35%, more preferably from 15 to 30%, even more preferably from 15 to 25% by weight of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, preferably, the compound of formula v-2 is selected from one or more compounds of the group consisting of:
Figure BDA0001189586290000152
Figure BDA0001189586290000161
Figure BDA0001189586290000171
Figure BDA0001189586290000181
in some embodiments of the present invention, preferably, the compound of formula v-3 is selected from one or more compounds of the group consisting of:
Figure BDA0001189586290000182
Figure BDA0001189586290000191
in some embodiments of the present invention, preferably, the compound of formula v-4 is selected from one or more compounds of the group consisting of:
Figure BDA0001189586290000192
in some embodiments of the present invention, preferably, the compound of formula v-5 is selected from one or more compounds of the group consisting of:
Figure BDA0001189586290000193
in some embodiments of the present invention, preferably, the compound of formula v-6 is selected from one or more compounds of the group consisting of:
Figure BDA0001189586290000201
in some embodiments of the present invention, preferably, the compound of formula v-7 is selected from one or more compounds of the group consisting of:
Figure BDA0001189586290000202
Figure BDA0001189586290000211
Figure BDA0001189586290000221
in some embodiments of the present invention, preferably, the compound of formula v-8 is selected from one or more compounds of the group consisting of:
Figure BDA0001189586290000222
in some embodiments of the present invention, preferably, the compound of formula v-9 is selected from one or more compounds of the group consisting of:
Figure BDA0001189586290000231
in some embodiments of the present invention, preferably, the compound of formula v-10 is selected from one or more compounds in the group consisting of:
Figure BDA0001189586290000232
Figure BDA0001189586290000241
Figure BDA0001189586290000251
in some embodiments of the present invention, preferably, the compound of formula v-11 is selected from one or more compounds in the group consisting of:
Figure BDA0001189586290000252
Figure BDA0001189586290000261
in some embodiments of the present invention, preferably, the compound of formula v-12 is selected from one or more compounds of the group consisting of:
Figure BDA0001189586290000262
Figure BDA0001189586290000271
Figure BDA0001189586290000281
another aspect of the present invention provides a liquid crystal composition having negative dielectric anisotropy, further comprising one or more additives known to those skilled in the art and described in the literature.
The stabilizers which may be added to the mixtures according to the invention are mentioned below, for example.
Figure BDA0001189586290000282
Figure BDA0001189586290000291
Figure BDA0001189586290000301
Preferably, the stabilizer is selected from the group consisting of the stabilizers shown below.
Figure BDA0001189586290000302
Figure BDA0001189586290000311
In the embodiment of the present invention, it is preferable that the stabilizer accounts for 0 to 5% by weight of the total weight of the liquid crystal composition; more preferably, the stabilizer accounts for 0-1% of the total weight of the liquid crystal composition; as a particularly preferred scheme, the stabilizing agent accounts for 0.01-0.1% of the total weight of the liquid crystal composition.
In still another aspect of the present invention, there is also provided a liquid crystal display comprising the liquid crystal composition provided by the present invention.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
the negative liquid crystal composition provided by the invention has the characteristics of large dielectric anisotropy of absolute value, wider nematic phase temperature range, low driving voltage, good low-temperature stability, higher clearing point, higher optical anisotropy and the like, particularly has low viscosity, and reduces the defects in an ODF (optical distribution function) process, so that a display device comprising the liquid crystal composition has higher response speed and has higher yield in a process.
Unless otherwise specified, the proportions recited in the present invention are by weight and all temperatures are in degrees Celsius.
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.
The liquid crystal displays used in the following embodiments are all negative liquid crystal display devices, and each of the liquid crystal displays has a cell thickness d of 4 μm and is composed of a polarizer (polarizing plate), an electrode substrate, and the like. The display device is in a normally white mode, i.e. when no voltage difference is applied between the row and column electrodes, a viewer perceives a pixel color that is white. The upper and lower polarizer axes on the substrate are at a 90 degree angle to each other. The space between the two substrates is filled with an optical liquid crystal material.
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
Figure BDA0001189586290000312
Figure BDA0001189586290000321
Compounds of the following formula are exemplified:
Figure BDA0001189586290000322
the structural formula is represented by the code listed in Table 2, and can be expressed as: 2PWP3, 2 in the code indicates a left end of-C2H5And 3 represents a right end of-C3H7(ii) a P in the code represents 1, 4-cyclohexylene; w represents 2, 3-difluoro-1, 4-phenylene.
The abbreviated codes of the test items in the following examples are as follows:
Figure BDA0001189586290000323
wherein the optical anisotropy is obtained by testing an Abbe refractometer under a sodium lamp (589nm) light source at 25 ℃; the dielectric test cell is of the VA type, and the thickness of the cell is 6 mu m.
Δ ∈ | — ∈ |, where | | | is the dielectric constant parallel to the molecular axis, ∈ | | is the dielectric constant perpendicular to the molecular axis, test conditions: the test box is VA type at 25 deg.C and 1KHz, and the thickness of the test box is 6 μm.
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.
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
Figure BDA0001189586290000331
Example 1
The liquid crystal composition of example 1 was prepared according to the compounds and weight percentages listed in table 3, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 3 liquid crystal composition formula and its test performance
Figure BDA0001189586290000332
Example 2
The liquid crystal composition of example 2 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
Figure BDA0001189586290000341
Compared with the comparative example 1, the liquid crystal compositions in the examples 1 and 2 have larger clearing points, better low-temperature intersolubility, wider application range of liquid crystal, lower viscosity, higher response of the liquid crystal, higher dielectric anisotropy, lower voltage driving and less possibility of poor display during the manufacture of liquid crystal devices.
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 with each compound and weight percentage as listed in table 5, and the test data are shown in the following table:
TABLE 5 liquid crystal composition formulations and their test properties
Figure BDA0001189586290000342
Figure BDA0001189586290000351
Example 3
The liquid crystal composition of example 3 was prepared according to the following 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
Figure BDA0001189586290000352
Example 4
The liquid crystal composition of example 4 was prepared according to the following compounds and weight percentages 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
Figure BDA0001189586290000353
Figure BDA0001189586290000361
Compared with the comparative example 2, the liquid crystal compositions of the examples 3 and 4 have better low-temperature intersolubility, higher clearing point, wider nematic phase temperature range and lower viscosity, are beneficial to realizing faster response by containing the liquid crystal composition of the invention, are not easy to generate poor display when a liquid crystal device is manufactured, and increase the yield of the device in the process.
As can be seen from the above comparative examples and examples, the negative liquid crystal composition of the present invention has characteristics of large absolute value of dielectric anisotropy, wide nematic phase temperature range, low driving voltage, good low temperature stability, high clearing point, high optical anisotropy, etc., and particularly, the negative liquid crystal composition of the present invention has low viscosity, reduces the defects in the ODF process, and thus, a display device comprising the liquid crystal composition of the present invention has a faster response speed and a higher yield in the process.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and equivalent changes and modifications made according to the spirit of the present invention should be covered thereby.

Claims (8)

1. A liquid crystal composition having negative dielectric anisotropy, comprising:
30-60% of one or more compounds of general formula I and/or II based on the total weight of the negative liquid crystal composition
Figure FDA0003402342040000011
8-30% of a compound of formula III based on the total weight of the negative liquid crystal composition
Figure FDA0003402342040000012
1-25% by total weight of the negative liquid crystal composition of one or more compounds selected from the group consisting of compounds of formulae IV-1 to IV-4:
Figure FDA0003402342040000013
Figure FDA0003402342040000014
and
20-50% of one or more compounds of formula V, based on the total weight of the negative liquid crystal composition
Figure FDA0003402342040000015
The compound of formula V comprises at least one or more compounds of formula V-11:
Figure FDA0003402342040000016
wherein the content of the first and second substances,
R1、R2、R3、R4、R7and R8The two substituents are the same or different and each independently represent-H, -F, a linear or branched halogenated or unhalogenated alkyl or alkoxy group having 1 to 12 carbon atoms, a linear or branched halogenated or unhalogenated alkenyl or alkenyloxy group having 2 to 12 carbon atoms;
R5and R6The same or different, each independently represents a linear or branched alkyl group or alkoxy group having 1 to 12 carbon atoms, an alkenyl group or alkenyloxy group having 2 to 12 carbon atoms;
Figure FDA0003402342040000021
are the same or different and each independently represents
Figure FDA0003402342040000022
Figure FDA0003402342040000023
The above-mentioned
Figure FDA0003402342040000024
One or more H atoms in (a) may be substituted by F atoms;
a represents 0, 1 or 2, wherein, when a is 0, a ring
Figure FDA0003402342040000025
Is not simultaneously represented
Figure FDA0003402342040000026
When a is 2, 2 rings
Figure FDA0003402342040000027
May be the same or different.
2. The negative dielectric anisotropy liquid crystal composition according to claim 1, wherein the compound of formula i is selected from the group consisting of:
Figure FDA0003402342040000028
Figure FDA0003402342040000031
3. the negative dielectric anisotropy liquid crystal composition of claim 1, wherein the compound of formula ii is selected from the group consisting of:
Figure FDA0003402342040000032
Figure FDA0003402342040000041
4. the negative dielectric anisotropy liquid crystal composition of claim 1, wherein the compound of formula iv is selected from the group consisting of:
Figure FDA0003402342040000042
and
Figure FDA0003402342040000043
wherein the content of the first and second substances,
R5and R6The same or different, each independently represents a linear or branched alkyl group or alkoxy group having 1 to 12 carbon atoms, an alkenyl group or alkenyloxy group having 2 to 12 carbon atoms.
5. The negative dielectric anisotropy liquid crystal composition of claim 1, wherein the compound of formula v further comprises one or more compounds selected from the group consisting of:
Figure FDA0003402342040000044
Figure FDA0003402342040000051
Figure FDA0003402342040000052
and
Figure FDA0003402342040000053
wherein the content of the first and second substances,
R7and R8The same or different, each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms.
6. A liquid crystal composition having negative dielectric anisotropy comprising the liquid crystal composition according to any one of claims 1 to 5, characterized in that the liquid crystal composition further comprises one or more additives.
7. A liquid crystal display comprising the liquid crystal composition according to any one of claims 1 to 5.
8. A liquid crystal display comprising the liquid crystal composition of claim 6.
CN201611203798.5A 2016-12-23 2016-12-23 Liquid crystal composition with negative dielectric anisotropy and display device thereof Active CN108239547B (en)

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