CN112300811B - Liquid crystal composition and liquid crystal display device - Google Patents

Liquid crystal composition and liquid crystal display device Download PDF

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CN112300811B
CN112300811B CN201910708890.4A CN201910708890A CN112300811B CN 112300811 B CN112300811 B CN 112300811B CN 201910708890 A CN201910708890 A CN 201910708890A CN 112300811 B CN112300811 B CN 112300811B
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crystal composition
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CN112300811A (en
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潘帝可
姚利芳
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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
    • 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
    • C09K19/46—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing esters

Abstract

The invention provides a liquid crystal composition and a liquid crystal display device, wherein the liquid crystal composition comprises at least one compound shown as a formula I, at least one compound shown as a formula II, at least one compound selected from compounds shown as formulas III-1 to III-3, at least one compound shown as a formula IV and at least one compound shown as a formula V; the liquid crystal composition has high contrast, simultaneously improves the transmittance and improves the low-temperature storage stability by simultaneously using a plurality of dioxane monomers and matching with other monomers, is suitable for liquid crystal systems with small refractive index anisotropy and large dielectric anisotropy, can meet the low-voltage driving requirement of the liquid crystal display at present, and is suitable for display modes with small refractive indexes such as ECB (electron cyclotron resonance) and the like.

Description

Liquid crystal composition and liquid crystal display device
Technical Field
The invention belongs to the field of liquid crystal materials, and relates to a liquid crystal composition and a liquid crystal display device.
Background
Liquid Crystal Displays (LCDs) have been rapidly developed due to their small size, light weight, low power consumption and excellent Display quality, and are widely used in portable electronic information products in particular. As the size of liquid crystal screens for portable computers, office applications, and video applications increases, liquid crystal displays can be used for large screen displays and eventually replace Cathode Ray Tube (CRT) displays. Liquid crystals are mainly used as dielectrics in liquid crystal display devices, since the optical properties of such substances can be changed by applying a voltage. The liquid crystal material must therefore have good chemical and thermal stability, as well as good stability to electric fields and electromagnetic radiation, etc.
Compared with the traditional display device and display material, the liquid crystal display material has the following obvious advantages: low driving voltage, low power consumption, high reliability, large display information amount, color display, no flicker, no harm to human body, automatic production process, low cost, capability of being made into various specifications and types of liquid crystal displays, convenience for carrying and the like. Due to these advantages, the liquid crystal display technology has a profound effect on the display and development field, and the development of the microelectronic technology and the optoelectronic information technology is promoted. The liquid crystal material is widely applied to various display occasions by virtue of good optical performance and photoelectric effect.
The dioxane compound is a high-quality monomer in liquid crystal monomers and is widely applied to the field of liquid crystal, but the prior art still has some technical problems to be solved, such as small K value, insufficient contrast, insufficient penetration rate, unstable low-temperature storage and the like.
The invention further improves the liquid crystal material to obtain some brand new performance advantages, develops a liquid crystal composition which has high contrast ratio, simultaneously improves the penetration rate, improves the low-temperature storage stability, is suitable for a liquid crystal system with small refractive index anisotropy and large dielectric anisotropy, can meet the low-voltage driving requirement of the prior art on a liquid crystal display, and is suitable for display modes such as ECB (electro-chromic) and the like.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a liquid crystal composition and a liquid crystal display device, wherein the liquid crystal composition has high contrast ratio, simultaneously improves the penetration rate, improves the low-temperature storage stability, is suitable for the liquid crystal composition of a liquid crystal system with small refractive index anisotropy and large dielectric anisotropy, can meet the low-voltage driving requirement of a liquid crystal display, and is suitable for the display modes of ECB and the like.
In order to achieve the technical effects, the invention adopts the following technical scheme:
one object of the present invention is to provide a liquid crystal composition comprising at least one compound represented by formula I, at least one compound represented by formula II, at least one compound selected from the group consisting of compounds represented by formulae III-1 to III-3, at least one compound represented by formula IV, and at least one compound represented by formula V;
Figure BDA0002153044360000021
Figure BDA0002153044360000022
and
Figure BDA0002153044360000031
wherein, R is1～R2And R12Each independently is a hydrogen atom, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms or a compound containingAlkenyloxy of 2 to 7 carbon atoms; the R is4-R11Each independently is a hydrogen atom, a halogenated or non-halogenated alkyl group having 1 to 7 carbon atoms, a halogenated or non-halogenated alkoxy group having 1 to 7 carbon atoms, a halogenated or non-halogenated alkenyl group having 2 to 7 carbon atoms, or a halogenated or non-halogenated alkenyloxy group having 1 to 7 carbon atoms;
the ring A0Ring B0Ring A1And ring B1Each independently is 1, 4-cyclohexylene or 1, 3-dioxanyl, and ring A0And B0Not identical, ring A1And B1At least one of which is 1, 3-dioxanyl; the ring A3-A5Ring B2-B5Ring C3-C4And ring D4Each independently is 1, 4-cyclohexylene, 1, 4-cyclohexenylene, 1, 4-phenylene or 1, 4-phenylene in which at least one hydrogen atom is substituted with a halogen atom;
z is0And Z1Each independently is a single bond or ethylene; z is2Is a single bond, ethylene, methyleneoxy or difluoroether group; z is4-Z6Each independently a single bond, an ester group, an ethylene group, a methyleneoxy group, a vinylene group, a halogenated ethylene group, or a halogenated vinylene group; z is7And Z8Each independently a single bond, ethylene or vinylene;
said L1-L3Each independently a hydrogen atom or a fluorine atom;
y is fluorine atom, trifluoromethyl or trifluoromethoxy;
m is 0 or 1;
n is 1 or 2, and when n is 2, ring B5The same or different.
In the invention, the alkyl containing 1-7 carbon atoms can be a straight chain or branched chain alkyl with 1, 2, 3, 4, 5, 6 and 7 carbon atoms;
the alkoxy containing 1-7 carbon atoms can be a straight chain or branched chain alkoxy with 1, 2, 3, 4, 5, 6 or 7 carbon atoms;
the alkenyl group containing 2 to 7 carbon atoms can be a straight chain or branched chain alkenyl group with 2, 3, 4, 5, 6 and 7 carbon atoms;
the alkenyloxy group having 2 to 7 carbon atoms may be a linear or branched alkenyloxy group having 2, 3, 4, 5, 6, or 7 carbon atoms.
The halogenated or non-halogenated alkyl containing 1-7 carbon atoms can be halogenated or non-halogenated straight-chain or branched-chain alkyl with 1, 2, 3, 4, 5, 6 or 7 carbon atoms;
the halogenated or non-halogenated alkyl containing 1-7 carbon atoms can be halogenated or non-halogenated straight-chain or branched alkoxy containing 1, 2, 3, 4, 5, 6 or 7 carbon atoms;
the halogenated or non-halogenated alkyl containing 2-7 carbon atoms can be halogenated or non-halogenated straight-chain or branched alkenyl with 2, 3, 4, 5, 6 and 7 carbon atoms;
the halogenated or non-halogenated alkyl group having 2 to 7 carbon atoms may be a halogenated or non-halogenated linear or branched alkenyloxy group having 2, 3, 4, 5, 6, 7 carbon atoms.
Compared with the prior art, the liquid crystal composition provided by the invention simultaneously uses a plurality of dioxane monomers, and is matched with other monomers such as dicyclohexyl, and the composition system has brand new performance advantages by adjusting the proportion of each component in the liquid crystal composition: the dark state display is improved, the contrast is improved, the penetration rate is improved, the low-temperature performance is improved, and better low-temperature storage performance can be obtained; the liquid crystal composition provided by the invention is suitable for liquid crystal systems with small refractive index anisotropy and large dielectric anisotropy, can meet the urgent need of low-voltage driving in the technical development, and can be applied to display modes such as ECB (electron cyclotron resonance) and the like.
As a preferred embodiment of the present invention, the liquid crystal composition comprises: the liquid crystal composition comprises 1-20% of the compound of the general formula I, 1-30% of the compound of the general formula II, 1-40% of the compound of the general formula III-1-III-3, 15-60% of the compound of the general formula IV and 1-50% of the compound of the general formula V.
Wherein the mass fraction of the compound represented by the formula I may be 2%, 5%, 8%, 10%, 12%, 15%, 18%, etc., the mass fraction of the compound represented by the formula II may be 2%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, etc., the mass fraction of the compound represented by the formula III-1 to 3 may be 5%, 10%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 35%, 38%, etc., the mass fraction of the compound represented by the formula IV may be 18%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, etc., the mass fraction of the compound represented by the formula V may be 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 48%, etc., but not limited to, the recited values and other values not recited within the range of values are equally applicable.
As a preferred technical solution of the present invention, the compound of the general formula I is any one or a combination of at least two of the compounds having the following structures:
Figure BDA0002153044360000051
Figure BDA0002153044360000061
wherein, R is1Having the same limitations as described above.
As a preferred embodiment of the present invention, the compound of formula II is any one or a combination of at least two of the following compounds:
Figure BDA0002153044360000062
Figure BDA0002153044360000071
wherein, R is2Having the same limitations as described above.
As a preferable technical scheme of the invention, the compound of the general formula II is selected from any one of general formula II-1 to general formula II-12 or a combination of at least two of the general formula II-1 to the general formula II-12.
More preferably, the compound of formula II is selected from any one of formula II-1, formula II-4, formula II-6, formula II-7, formula II-9, formula II-11 and formula II-12 or a combination of at least two thereof.
As a preferred technical scheme of the invention, the compound of the general formula III-1 is any one or the combination of at least two of the compounds with the following structures:
Figure BDA0002153044360000081
wherein, R is4And R5Having the same limitations as described above.
More preferably, the compound of III-1 is any one of or a combination of at least two of the compounds having the following structures:
Figure BDA0002153044360000082
wherein R is4Is an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or an alkenyl group having 2 to 7 carbon atoms; r5Is an alkyl group having 1 to 7 carbon atoms or an alkoxy group having 1 to 7 carbon atoms.
Preferably, the compound of formula III-2 is any one of or a combination of at least two of the compounds having the following structures:
Figure BDA0002153044360000091
Figure BDA0002153044360000101
wherein, R is6And R7Having the same limitations as described above.
Among them, the general formula III-2-1 more preferably has any one or a combination of at least two of the following structures:
Figure BDA0002153044360000102
wherein, R is6And R7Each independently an alkyl group having 1 to 7 carbon atoms or an alkoxy group having 1 to 7 carbon atoms.
More preferably, formula III-2-2 has any one or a combination of at least two of the following structures:
Figure BDA0002153044360000103
Figure BDA0002153044360000111
wherein, R is6And R7Each independently an alkyl group having 1 to 7 carbon atoms or an alkoxy group having 1 to 7 carbon atoms.
Preferably, the compound of formula III-3 is any one of or a combination of at least two of the compounds having the following structures:
Figure BDA0002153044360000112
wherein, R is8And R9Having the same limitations as described above.
As a preferred embodiment of the present invention, the compound of formula IV is any one or a combination of at least two of the compounds having the following structures:
Figure BDA0002153044360000113
Figure BDA0002153044360000121
wherein R is10-R11Independently represents an alkyl group having 1 to 7 carbon atoms or an alkoxy group having 1 to 7 carbon atoms.
As a preferred embodiment of the present invention, the compound of formula V is any one or a combination of at least two of the compounds having the following structures:
Figure BDA0002153044360000122
Figure BDA0002153044360000131
Figure BDA0002153044360000141
wherein, R is12Having the same limitations as described above.
As an embodiment of the present invention, the liquid crystal composition further comprises at least one compound represented by formula VI:
Figure BDA0002153044360000142
wherein, R is13Is hydrogen atom, cyclopropyl, cyclobutyl, cyclopentyl, alkyl group having 1 to 7 carbon atoms, alkoxy group having 1 to 7 carbon atoms, alkenyl group having 2 to 7 carbon atoms or alkenyloxy group having 2 to 7 carbon atoms;
a is described6And B6Each independently a 1, 4-cyclohexylene group, a 1, 4-cyclohexenylene group, a 1, 4-phenylene group in which at least one hydrogen atom is substituted with a halogen atom, a 1, 3-dioxane group or a tetrahydropyran-2, 5-diyl group;
so-called Z7Is a single bond, ethylene or vinylene;
said L4And L5Each independently is a hydrogen atom or a fluorine atom, the L6Is a hydrogen atom or a methyl group;
said Y1Is a fluorine atom, trifluoromethyl or trifluoromethoxy;
o is 1 or 2, when o is 2, ring B6The same or different.
As a preferred embodiment of the present invention, the compound of formula VI is any one or a combination of at least two of the compounds having the following structures:
Figure BDA0002153044360000151
Figure BDA0002153044360000161
Figure BDA0002153044360000171
Figure BDA0002153044360000181
wherein, R is13Represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms or an alkenyloxy group having 2 to 7 carbon atoms.
Preferably, the mass fraction of the compound of formula VI in the liquid crystal composition is 0-35%, such as 0%, 1%, 5%, 10%, 15%, 20%, 25%, or 30%, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable.
The invention also provides a liquid crystal display device which comprises the liquid crystal composition.
In the present invention, specific meanings of codes in the respective liquid crystal molecules are shown in table 1.
TABLE 1
Figure BDA0002153044360000182
Figure BDA0002153044360000191
Compared with the prior art, the invention at least has the following beneficial effects:
the invention provides a liquid crystal composition and a liquid crystal display device, wherein the liquid crystal composition has high contrast ratio, simultaneously improves response speed and penetration rate, improves low-temperature storage stability, can meet the low-voltage driving requirement of a liquid crystal display, and is suitable for display modes with small refractive indexes such as ECB (equal-reflection-band).
Detailed Description
For the purpose of facilitating an understanding of the present invention, the following examples are set forth herein. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitation of the present invention.
The structural code is illustrated by the compound of the following formula:
Figure BDA0002153044360000201
the structural formula can be expressed as nCPPm if the structural formula is represented by a code shown in Table 1, wherein n represents the number of carbon atoms of the alkyl group at the left end, for example, n is 3, that is, the alkyl group is-C3H7Wherein C in the code represents a cyclohexane group, P represents a phenyl group, m represents the number of carbon atoms of a rightmost alkyl group, for example, m is 2, that is, the alkyl group is-C2H5。
The abbreviated codes of the test items in the following examples are as follows:
cp clearing Point (nematic phase-transition temperature of isotropic phase,. degree. C.)
Δ n optical anisotropy (589nm, 25 ℃ C.)
Delta epsilon dielectric anisotropy (1KHz, 25 ℃ C.)
K11Elasticity constant of splay
K22Torsional elastic constant
K33Flexural elastic constant
LTS Low temperature storage stability
T (transmittance) ratio of light intensity before and after the light passes through the liquid crystal.
Wherein the optical anisotropy is measured by using an Abbe refractometer under a sodium lamp (589nm) light source at 25 ℃.
Δε＝ε‖-ε⊥Wherein epsilon‖Is a dielectric constant parallel to the molecular axis,. epsilon⊥For the dielectric constant perpendicular to the molecular axis, test conditions: the test box is TN90 type at 25 deg.C and 1KHz, and has a thickness of 7 μm.
K11、K22、K33The liquid crystal display device is obtained by using an LCR instrument and an antiparallel friction box to test a C-V curve of liquid crystal and calculating the following test conditions: a 7-micron antiparallel friction box, wherein V is 0.1-20V;
t (penetration) test conditions: the V-T (transmittance) curve of the liquid crystal is tested by using DMS 505, a positive 3.5 mu m IPS cell is adopted as a test box, and V is 0-20V.
Example 1
This example provides a liquid crystal composition, the specific composition and performance parameters of which are shown in table 2.
TABLE 2
Figure BDA0002153044360000211
Figure BDA0002153044360000221
Example 2
This example provides a liquid crystal composition, the specific composition and performance parameters of which are shown in table 3.
TABLE 3
Figure BDA0002153044360000222
Example 3
The present example provides a liquid crystal composition, the specific composition and performance parameters of which are shown in table 4.
TABLE 4
Figure BDA0002153044360000231
Example 4
This example provides a liquid crystal composition, the specific composition and performance parameters of which are shown in table 5.
TABLE 5
Figure BDA0002153044360000241
Example 5
The present example provides a liquid crystal composition, the specific composition and performance parameters of which are shown in table 6.
TABLE 6
Figure BDA0002153044360000251
Example 6
This example provides a liquid crystal composition, the specific composition and performance parameters of which are shown in table 7.
TABLE 7
Figure BDA0002153044360000261
Example 7
This example provides a liquid crystal composition, the specific composition and performance parameters of which are shown in table 8.
TABLE 8
Figure BDA0002153044360000271
Example 8
The present example provides a liquid crystal composition, the specific composition and performance parameters of which are shown in table 9.
TABLE 9
Figure BDA0002153044360000281
Example 9
This example provides a liquid crystal composition, the specific composition and performance parameters of which are shown in table 10.
TABLE 10
Figure BDA0002153044360000291
Example 10
The present example provides a liquid crystal composition, the specific composition and performance parameters of which are shown in table 11.
TABLE 11
Figure BDA0002153044360000301
Figure BDA0002153044360000311
Comparative example 1
This comparative example provides a liquid crystal composition having the specific composition and performance parameters shown in table 12.
TABLE 12
Figure BDA0002153044360000312
As can be seen from comparison between examples 1-10 and comparative example 1, the liquid crystal composition of the invention has a large K value, the penetration rate and the contrast are obviously improved, and the low-temperature intersolubility is also improved, so that the low-temperature storage performance is improved.
The applicant states that the present invention is illustrated by the above examples to show the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, i.e. it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (8)

1. The liquid crystal composition is characterized by comprising 5-18% of at least one compound shown as a formula I, 2-25% of at least one compound shown as formulas II-1-II-12, 9-38% of at least one compound shown as formulas III-1-III-3, 18-60% of at least one compound shown as a formula IV and 7-48% of at least one compound shown as a formula V, wherein the compounds are respectively represented as formulas I, II-1-II-12 and II-3;
Figure FDA0003661070510000011
wherein, R is1～R2And R12Each independently is a hydrogen atom, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms or an alkenyloxy group having 2 to 7 carbon atoms; the R is4-R11Each independently of the other is a hydrogen atom, a halogenated or non-halogenated alkyl group having 1 to 7 carbon atoms, a halogenated or non-halogenated alkoxy group having 1 to 7 carbon atomsA halogenated or non-halogenated alkenyl group having 2 to 7 carbon atoms, or a halogenated or non-halogenated alkenyloxy group having 1 to 7 carbon atoms;
the ring A0And ring B0Each independently is 1, 4-cyclohexylene or 1, 3-dioxanyl, and ring A0And B0Different; the ring A3-A5Ring B2-B5Ring C3-C4And ring D4Each independently a 1, 4-cyclohexylene group, a 1, 4-cyclohexenylene group, a 1, 4-phenylene group or a 1, 4-phenylene group in which at least one hydrogen atom is substituted with a halogen atom;
z is0Is a single bond or ethylene; z is4-Z6Each independently a single bond, an ester group, an ethylene group, a methyleneoxy group, a vinylene group, a halogenated ethylene group, or a halogenated vinylene group; z is7And Z8Each independently a single bond, ethylene or vinylene;
said L is2-L3Each independently is a hydrogen atom or a fluorine atom;
y is fluorine atom, trifluoromethyl or trifluoromethoxy;
n is 1 or 2, and when n is 2, ring B5The same or different;
the compounds of the general formulas II-1 to II-12 have the following structures:
Figure FDA0003661070510000021
Figure FDA0003661070510000031
Figure FDA0003661070510000041
2. the liquid crystal composition according to claim 1, wherein the compound of formula III-1 is any one or a combination of at least two of the compounds having the following structure:
Figure FDA0003661070510000042
wherein, R is4And R5Having the same limitations as defined in claim 1;
the compound of the general formula III-2 is any one or combination of at least two of the compounds with the following structures:
Figure FDA0003661070510000043
Figure FDA0003661070510000051
wherein, R is6And R7Having the same limits as in claim 1;
the compound of the general formula III-3 is any one or combination of at least two of the compounds with the following structures:
Figure FDA0003661070510000052
Figure FDA0003661070510000061
wherein, R is8And R9Having the same limits as in claim 1.
3. The liquid crystal composition of claim 1, wherein the compound of formula IV is any one or a combination of at least two of the compounds having the following structures:
Figure FDA0003661070510000062
wherein R is10And R11Independently represents an alkyl group having 1 to 7 carbon atoms or an alkoxy group having 1 to 7 carbon atoms.
4. The liquid crystal composition of claim 1, wherein the compound of formula V is any one or a combination of at least two of the compounds having the following structures:
Figure FDA0003661070510000063
Figure FDA0003661070510000071
Figure FDA0003661070510000081
Figure FDA0003661070510000091
wherein, R is12Having the same limitations as defined in claim 1.
5. The liquid crystal composition of claim 1, further comprising at least one compound of formula VI:
Figure FDA0003661070510000092
wherein, R is13Is hydrogen, cyclopropyl, cyclobutyl, cyclopentyl, alkyl containing 1 to 7 carbon atoms, alkoxy containing 1 to 7 carbon atoms, alkenyl containing 2 to 7 carbon atoms or alkenyloxy containing 2 to 7 carbon atoms;
a is described6And B6Each independently a 1, 4-cyclohexylene group, a 1, 4-cyclohexenylene group, a 1, 4-phenylene group in which at least one hydrogen atom is substituted with a halogen atom, a 1, 3-dioxane group or a tetrahydropyran-2, 5-diyl group;
so-called Z7Is a single bond, ethylene or vinylene;
said L4And L5Each independently is a hydrogen atom or a fluorine atom, the L6Is a hydrogen atom or a methyl group;
said Y is1Is fluorine atom, trifluoromethyl or trifluoromethoxy;
o is 1 or 2, when o is 2, ring B6The same or different.
6. The liquid crystal composition of claim 5, wherein the compound of formula VI is any one or a combination of at least two of the compounds having the following structures:
Figure FDA0003661070510000101
Figure FDA0003661070510000111
Figure FDA0003661070510000121
wherein, R is13Represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms or an alkenyloxy group having 2 to 7 carbon atoms.
7. The liquid crystal composition according to claim 5, wherein the mass fraction of the compound represented by the formula VI in the liquid crystal composition is 1-35%.
8. A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 7.
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