CN114015462A - Positive liquid crystal composition and liquid crystal display - Google Patents

Positive liquid crystal composition and liquid crystal display Download PDF

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CN114015462A
CN114015462A CN202111397504.8A CN202111397504A CN114015462A CN 114015462 A CN114015462 A CN 114015462A CN 202111397504 A CN202111397504 A CN 202111397504A CN 114015462 A CN114015462 A CN 114015462A
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liquid crystal
crystal composition
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CN114015462B (en
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史志兵
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Chongqing Hanlang Precision Technology Co ltd
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Halation Photonics Corp
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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

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Abstract

The invention discloses a positive liquid crystal composition, which comprises the following components in part by weight: (1) at least one compound of formula I, (2) at least one compound of formula II, and (3) at least one compound of formula III. The positive liquid crystal composition effectively improves epsilon/| delta epsilon | value of the liquid crystal composition by adding the polar single benzene ring substituent, and has proper high clearing point, proper optical anisotropy, good low-temperature storage performance and large elastic constant K11And K33The liquid crystal display is particularly suitable for IPS and FFS display, and has the effects of improving the transmittance and reducing the response time.

Description

Positive liquid crystal composition and liquid crystal display
Technical Field
The invention relates to the technical field of liquid crystal materials, in particular to a positive liquid crystal composition and a liquid crystal display.
Background
The liquid crystal material is a mixture of organic rod-shaped small molecular compounds which have liquid fluidity and crystal anisotropy at a certain temperature. Liquid crystal display devices operate by utilizing optical anisotropy and dielectric anisotropy of liquid crystal materials themselves, and are currently widely used. These liquid crystal display elements include a liquid crystal composition having appropriate physical properties. General physical properties required for a liquid crystal compound as a component of a liquid crystal composition are as follows: (1) stable chemical and physical properties and high clearing point (nematic phase-isotropic phase transition temperature); (2) the lower limit temperature of the liquid crystal phase is low; (3) excellent compatibility with other liquid crystal compounds; (4) dielectric anisotropy with appropriate magnitude; (5) having an optical anisotropy of suitable magnitude.
In the early 70 s of the last century, researchers have conducted experimental studies on the basic electro-optical characteristics of the uniformly aligned and twisted nematic liquid crystal IPS mode, which is characterized by a pair of electrodes fabricated on the same substrate, but without electrodes on the other substrate, and by the lateral electric field applied between the pair of electrodes to control the alignment of the liquid crystal molecules, and thus this mode can also be referred to as the lateral field mode. In the IPS mode, nematic liquid crystal molecules are uniformly arranged in parallel between two substrates, and two polarizing plates are orthogonally arranged. In the IPS mode, when an electric field is not applied, incident light is blocked by two orthogonal polarizing plates to be in a dark state, and when the electric field is applied, the visible angle of liquid crystal molecules is large, the color is accurately restored, but the defects of serious light leakage, slow response speed and high energy consumption are overcome.
With the wide application of TFT-type LCDs, the performance requirements of TFT-type LCDs are continuously increasing, and high display image quality requires faster response speed, lower power consumption, and higher low-temperature reliability, and in addition, higher contrast and transmittance are required, especially for IPS-type liquid crystal display modes. This means that liquid crystal materials are required to have higher contrast and transmittance, higher elastic constant, faster response speed, higher dielectric constant, and low temperature reliability, and improvement of these properties is required.
Specifically, in IPS (in-plane switching) and FFS (fringe field effect) mode displays, transmittance (t) — epsilon |/| Δ epsilon |, and in order to increase the transmittance of a liquid crystal material, it is attempted to decrease Δ epsilon of the liquid crystal material, but generally, the adjustment range of the driving voltage of the same product is limited.
In view of the above, the method for improving the transmittance of the liquid crystal material can be considered as follows: the transmittance can be increased by increasing ∈/| Δ ∈ |. Therefore, there is a need for a liquid crystal composition that can ensure a high transmittance of the liquid crystal composition and that has properties such as a suitably high clearing point, a high optical anisotropy, and a high dielectric anisotropy at the same time.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a liquid crystal composition, which effectively improves epsilon/| delta epsilon | of the liquid crystal composition (the ratio of vertical dielectric to dielectric absolute value), and has a good effect of improving the transmittance. Specifically, the liquid crystal composition provided by the invention has large vertical dielectric and further has high transmittance.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a positive liquid crystal composition, which comprises the following components in part by weight:
(1) at least one compound of formula I:
Figure BDA0003370483200000021
wherein R is1、R2Independently of one another represent C1-C12Alkyl of (C)1-C12Alkoxy group of (a); or, said C1-C12Alkyl of (C)1-C12At least one hydrogen atom in the alkoxy group of (a) is independently substituted by halogen; or, said C1-C12Alkyl of (C)1-C12One of alkoxy groups of (2) -CH2-or at least two non-adjacent-CHs2-independently of each other by-O-, -CH ═ CH-, -C ≡ C-, -CO-O-, or-O-CO-in a manner not directly linked;
X1、X2independently of one another denotes-F, -CF3；
(2) At least one compound of formula II:
Figure BDA0003370483200000022
wherein R is21Is represented by C1-C12Alkyl of (C)1-C12Alkoxy group of (a); or, said C1-C12Alkyl of (C)1-C12At least one hydrogen atom in the alkoxy group of (a) is independently substituted by halogen; or, said C1-C12Alkyl of (C)1-C12One of alkoxy groups of (2) -CH2-or at least two non-adjacent-CHs2-independently of each other by-O-, -CH ═ CH-, -C ≡ C-, -CO-O-, or-O-CO-in a manner not directly linked;
L1、L2represent H, F, -OCF independently of each other3；
Figure BDA0003370483200000031
Represents:
Figure BDA0003370483200000032
Figure BDA0003370483200000033
represents:
Figure BDA0003370483200000034
(3) at least one compound of formula III:
Figure BDA0003370483200000035
wherein R is31、R32Independently of one another represent C1-C12Straight chain alkyl group of (1), C1-C12Linear alkoxy of (5) or C2-C12A linear alkenyl group of (a);
Figure BDA0003370483200000036
independently of one another, represents trans-1, 4-cyclohexylene or 1, 4-phenylene.
Preferably, the compound of formula I is selected from one or more of the following compounds:
Figure BDA0003370483200000037
Figure BDA0003370483200000041
Figure BDA0003370483200000051
Figure BDA0003370483200000061
preferably, the compound of formula II is selected from one or more of the following compounds:
Figure BDA0003370483200000062
Figure BDA0003370483200000071
preferably, the compound of formula III is selected from one or more of the following compounds:
Figure BDA0003370483200000072
Figure BDA0003370483200000081
Figure BDA0003370483200000091
preferably, the compound shown in the general formula I accounts for 3-20% of the total weight of the liquid crystal composition.
In some embodiments, the positive liquid crystal composition further comprises one or more compounds of formula IV:
Figure BDA0003370483200000092
wherein R is4Is represented by C1-C12Straight chain alkyl group of (1), C1-C12Straight chain alkoxy of (a);
Figure BDA0003370483200000093
to represent
Figure BDA0003370483200000094
Figure BDA0003370483200000095
To represent
Figure BDA0003370483200000096
X3、X4、X5Independently of one another-H, -F, -OCF3；
q represents 1 or 2.
Preferably, the compound of formula IV is selected from one or more of the following compounds:
Figure BDA0003370483200000101
wherein R is4Is represented by C1-C12Straight chain alkyl group of (1), C1-C12Linear alkoxy groups of (1).
In some embodiments, the positive liquid crystal composition further comprises one or more compounds of formulas V-A to V-C:
Figure BDA0003370483200000111
wherein R is41、R42Are connected with each otherIndependently represent C1-C7Straight chain alkyl group of (1), C1-C7Linear alkoxy of (5) or C2-C7A linear alkenyl group of (a); z1Represents a single bond, -CH2CH2-、-CH＝CH-、-CF2O-、-OCF2-、-CH2O-、-OCH2-、-COO-、-OCO-、-CF2CF2-、-C4H8-、-CF＝CF-；
p and n independently of one another represent 0 or 1, and m represents 1 or 2.
Preferably, the compounds of formulae V-A to V-C are selected from one or more of the following compounds:
Figure BDA0003370483200000112
Figure BDA0003370483200000121
Figure BDA0003370483200000131
Figure BDA0003370483200000141
Figure BDA0003370483200000151
Figure BDA0003370483200000161
Figure BDA0003370483200000171
Figure BDA0003370483200000181
Figure BDA0003370483200000191
Figure BDA0003370483200000201
in some embodiments, the positive liquid crystal composition further comprises one or more compounds of formulas VI-1 to VI-9:
Figure BDA0003370483200000202
Figure BDA0003370483200000211
wherein R is51And R52Independently of one another represent C1-C12Straight chain alkyl group of (1), C1-C12Linear alkoxy of (5) or C2-C12Linear alkenyl groups of (a).
Preferably, in the positive liquid crystal composition, the mass content of the compound represented by the general formula II is 0.01-50%. The mass content of the compound represented by the general formula III is preferably 1 to 50%, more preferably 5 to 45%. The mass content of the compound represented by the general formula IV is preferably 1 to 60%, more preferably 5 to 50%. Preferably, the mass content of the compound of formula V is 1-50%, preferably 5-30%. Preferably, the mass content of the compound of formula VI is 1-40%, preferably 4-30%.
In some embodiments, the positive liquid crystal composition further comprises an additive selected from one or more of a radical scavenger, an antioxidant, and a UV stabilizer. Preferably, the stabilizer may be selected from one or more of the following compounds:
Figure BDA0003370483200000212
Figure BDA0003370483200000221
Figure BDA0003370483200000231
Figure BDA0003370483200000241
more preferably, the stabilizer is selected from the group consisting of the stabilizers shown below:
Figure BDA0003370483200000242
in each of the above compounds, n represents an integer of 1 to 8.
In the invention, the content of the additive is preferably 0-5% of the total mass of the liquid crystal composition; more preferably, the content of the additive agent is 0-1% of the total weight of the liquid crystal composition; further preferably, the content of the additive is 0.01-0.2% of the total weight of the liquid crystal composition.
The invention also provides a liquid crystal display comprising the positive liquid crystal composition. The liquid crystal display is preferably an IPS or FFS mode liquid crystal display.
Compared with the prior art, the invention has the beneficial effects that:
the invention effectively improves the epsilon/| delta epsilon | value of the liquid crystal composition by adding the polar single benzene ring substituent into the positive liquid crystal mixture. Meanwhile, the liquid crystal composition has a high clearing point, optical anisotropy, low-temperature storage performance and a large elastic constant K11And K33Is particularly suitable forIPS and FFS show that these materials can improve transmittance and reduce response time.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
For convenience of expression, in the following examples, the group structures of the liquid crystal compositions are represented by the codes listed in Table 1.
TABLE 1
Figure BDA0003370483200000251
Figure BDA0003370483200000261
The following compounds are exemplified:
Figure BDA0003370483200000262
the code of Table 1 is expressed as: 3CWO4, 3 for propyl, C for cyclohexane, W for 2, 3-difluorobenzene and 4 for butyl.
Figure BDA0003370483200000263
The code of Table 1 is expressed as: 4OMO 4.
The abbreviated codes of the test items in the following examples are as follows:
cp (. degree. C.): clearing point (nematic-isotropic phase transition temperature);
Δ n: refractive index anisotropy (589nm, 25 ℃);
Δ ε: dielectric anisotropy (1KHz, 25 ℃);
γ1: represents the rotational viscosity [ mPas ] measured at 25 DEG C]；
LTS: low temperature stable nematic phase transition temperature (test in test box, C.)
K11: splay elastic constant (pN, 25 ℃);
K33: flexural modulus (pN, 25 ℃);
wherein, Delta Epsilon ═ Epsilon||-ε⊥Wherein, epsilon||Is a dielectric constant parallel to the molecular axis,. epsilon⊥For the dielectric constant perpendicular to the molecular axis, test conditions: 25 ℃ and 1 KHz.
Example M1
The liquid crystal was prepared in the following proportions to obtain a mixture M1, which was filled between two substrates of a liquid crystal device for performance testing, the components of the mixture and the test data are shown in Table 2:
TABLE 2
Components Percent by weight% Performance of
4OMO4 6 Cp 80
3CCV 38 Δn 0.1122
3CCV1 13 Δε 10.1
V2CCP1 4 γ1 75
3CDUQUF 3 LTS ＜-30
3PGUQUF 7 ε⊥ 4.4
4PGUQUF 6 ε⊥/Δε 0.435
2PGP2V 6 K11 14.6
3PGP2V 6 K33 16.2
3PGUF 5
4PGUF 5
3PPGGF 1
Total of 100
Comparative example D1
4OMO4 in example 1 was removed to obtain a mixture D1, which was filled between two substrates of a liquid crystal device for performance testing, and the components and test data of the mixture are shown in Table 3:
TABLE 3
Figure BDA0003370483200000271
Figure BDA0003370483200000281
Example M2
The liquid crystal was prepared in the following proportions to obtain a mixture M2, which was filled between two substrates of a liquid crystal device for performance testing, the components of the mixture and the test data being shown in Table 4:
TABLE 4
Components Percent by weight% Performance of
5OMO3 6 Cp 82
3CPWO2 7 Δn 0.098
3CCWO2 6 Δε 2.2
4CCWO2 6 γ1 56
3CCV 46 LTS ＜-30
3CPO2 3 ε⊥ 4.2
3PGUQUF 3 ε⊥/Δε 1.91
3CCP1 3 K11 13.5
3CPUF 4 K33 15.4
3CPPC3 4
3PGUF 5
4PGUF 7
Total of 100
Example M3
The liquid crystal was prepared in the following proportions to obtain a mixture M3, which was filled between two substrates of a liquid crystal device for performance testing, the components of the mixture and the test data being shown in Table 5:
TABLE 5
Figure BDA0003370483200000282
Figure BDA0003370483200000291
Comparative example D2
Compound 5OMO3 in example 3 was removed to obtain a mixture D2, which was filled between two substrates of a liquid crystal device for performance testing, the composition of the mixture and the test data are shown in table 6:
TABLE 6
Components Percent by weight% Performance of
3CCUF 5 Cp 87
3CPUF 4 Δn 0.101
3CCWO2 7 Δε 2.5
2CPWO2 3 γ1 62
3CPWO2 6 ε⊥ 3.6
3CCV 41 ε⊥/Δε 1.44
3CPO2 10 K11 13.6
3CCV1 18 K33 14.2
3CPPC3 4
Total of 100
Example M4
The liquid crystal was prepared in the following proportions to obtain a mixture M4, which was filled between two substrates of a liquid crystal device for performance testing, the composition of the mixture and the test data being shown in Table 7:
TABLE 7
Components Percent by weight% Performance of
5OMO3 6 Cp 80
3PGUF 5 Δn 0.095
3CPUF 4 Δε 2.3
3CCWO2 7 γ1 54
3CPWO2 8 LTS ＜-30
3CCV 39 ε⊥ 4.2
3CPP1 9 ε⊥/Δε 1.82
3CPP2 9 K11 15.1
3DUQUF 6 K33 17.1
2PGP3 3
3CPPC3 4
Total of 100
Example M5
The liquid crystal was prepared in the following proportions to obtain a mixture M5, which was filled between two substrates of a liquid crystal device for performance testing, the components of the mixture and the test data being shown in Table 8:
TABLE 8
Figure BDA0003370483200000301
Figure BDA0003370483200000311
Example M6
The liquid crystal was prepared in the following proportions to obtain a mixture M6, which was filled between two substrates of a liquid crystal device for performance testing, the composition of the mixture and the test data being shown in Table 9:
TABLE 9
Components Percent by weight% Performance of
4OMO4 4 Cp 75
3PGUF 5 Δn 0.112
3CPUF 4 Δε 4
3CCWO2 7 γ1 62
3CPWO2 8 LTS ＜-30
3CCV 40 ε⊥ 4.4
3CCV1 9 ε⊥/Δε 1..10
3CPP1 4 K11 14.5
3CPP2 6 K33 16.0
3PGUQUOCF3 5
V2PGP1 4
3CPPC3 4
Total of 100 Total of 100
Example M7
The liquid crystal was prepared in the following proportions to obtain a mixture M7, which was filled between two substrates of a liquid crystal device for performance testing, the components of the mixture and the test data being shown in Table 10:
watch 10
Figure BDA0003370483200000312
Figure BDA0003370483200000321
Comparative example D3
Compound 4OMO4 in example 7 was removed to give a mixture D3, which was filled between two substrates of a liquid crystal device for performance testing, the composition of the mixture and the test data are shown in table 11:
TABLE 11
Figure BDA0003370483200000322
Figure BDA0003370483200000331
Example M8
The liquid crystal was prepared in the following proportions to obtain a mixture M8, which was filled between two substrates of a liquid crystal device for performance testing, the composition of the mixture and the test data being shown in table 12:
TABLE 12
Components Percent by weight% Performance of
4OMO4 6 Cp 78
3PGUF 5 Δn 0.108
3CPUF 4 Δε 3.1
3CC1OWO2 7 γ1 70
4CC1OWO2 8 LTS ＜-30
3CC2 18 ε⊥ 3.9
4CC3 12 ε⊥/Δε 1.26
3CPP1 4 K11 14.8
3CPP2 6 K33 15.9
3PGUQUOCF3 6
V2PGP1 4
3CPPC3 4
3PPGUF 1
2CCGF 8
3CCGF 7
Total of 100
Example M9
The liquid crystal was prepared in the following proportions to obtain a mixture M9, which was filled between two substrates of a liquid crystal device for performance testing, the composition of the mixture and the test data being shown in Table 13:
watch 13
Figure BDA0003370483200000332
Figure BDA0003370483200000341
Example M10
The liquid crystal was prepared in the following proportions to obtain a mixture M10, which was filled between two substrates of a liquid crystal device for performance testing, the composition of the mixture and the test data being shown in Table 14:
TABLE 14
Figure BDA0003370483200000342
Figure BDA0003370483200000351
An additional 300ppm of a stabilizer of the formula was added during the testing of all the mixtures described above:
Figure BDA0003370483200000352
example M11
The liquid crystal was prepared in the following proportions to obtain a mixture M11, which was filled between two substrates of a liquid crystal device for performance testing, the composition of the mixture and the test data being shown in Table 15:
watch 15
Figure BDA0003370483200000353
Figure BDA0003370483200000361
Example M12
The liquid crystal was prepared in the following proportions to obtain a mixture M12, which was filled between two substrates of a liquid crystal device for performance testing, the composition of the mixture and the test data being shown in Table 16:
TABLE 16
Components Percent by weight% Performance of Components
2OMO2 3 Cp 77.1
5CGUQUF 5 Δn 0.101
3PGUQUF 3 Δε 65.7
4PGUQUF 6 γ1 69
5PGUQUF 3 LTS ＜-30
3CCV 40 ε⊥ 4.3
3CCV1 7 ε⊥/Δε 0.75
3CC5 3 K11 13.5
3CCP1 4 K33 15.8
VCCP1 5
V2PGP1 5
1PP2V 3
3PUQUF 10
3CCPUF 3
Total of 100
Example M13
The liquid crystal was prepared in the following proportions to obtain a mixture M13, which was filled between two substrates of a liquid crystal device for performance testing, the composition of the mixture and the test data being shown in Table 17:
TABLE 17
Figure BDA0003370483200000362
Figure BDA0003370483200000371
As can be seen from the experimental data of example M1 and comparative example D1, example M3 and comparative example D2, and example M7 and comparative example D3, by adding the compound of the formula I to the liquid-crystal mixture, the ratio ε of the vertical dielectric to the absolute dielectric value of the liquid-crystal composition⊥/. DELTA.. epsilon., elastic constant K11And K33Are all improved.
In conclusion, the liquid crystal composition provided by the invention has large vertical dielectric, and further has a larger ratio epsilon/delta epsilon of the vertical dielectric to the absolute value of the dielectric, and further has higher transmittance; meanwhile, the liquid crystal composition has a proper clearing point, proper optical anisotropy, good low-temperature storage performance and a large elastic constant K11And K33. Therefore, the liquid crystal composition provided by the invention is suitable for IPS or FFS type TFT liquid crystal display devices, can obviously improve the transmittance of a liquid crystal display and reduce the energy loss of a backlight source, and is particularly suitable for FFS type liquid crystal displays.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.

Claims (13)

1. A positive liquid crystal composition comprising:
(1) at least one compound of formula I:
Figure FDA0003370483190000011
wherein R is1、R2Independently of one another represent C1-C12Alkyl of (C)1-C12Alkoxy group of (a); or, said C1-C12Alkyl of (C)1-C12At least one hydrogen atom in the alkoxy group of (a) is independently substituted by halogen; or, said C1-C12Alkyl of (C)1-C12One of alkoxy groups of (2) -CH2-or at least two non-adjacent-CHs2-independently of each other by-O-, -CH ═ CH-, -C ≡ C-, -CO-O-, or-O-CO-in a manner not directly linked;
X1、X2independently of one another denotes-F, CF3；
(2) At least one compound of formula II:
Figure FDA0003370483190000012
wherein R is21Is represented by C1-C12Alkyl of (C)1-C12Alkoxy group of (a); or, said C1-C12Alkyl of (C)1-C12At least one hydrogen atom in the alkoxy group of (a) is independently substituted by halogen; or, said C1-C12Alkyl of (C)1-C12One of alkoxy groups of (2) -CH2-or at least two non-adjacent-CHs2-independently of each other by-O-, -CH ═ CH-, -C ≡ C-, -CO-O-, or-O-CO-in a manner not directly linked;
L1、L2independently of one another-H, -F, -OCF3；
Figure FDA0003370483190000013
Represents:
Figure FDA0003370483190000014
Figure FDA0003370483190000015
represents:
Figure FDA0003370483190000016
(3) at least one compound of formula III:
Figure FDA0003370483190000021
wherein R is31、R32Independently of one another represent C1-C12Straight chain alkyl group of (1), C1-C12Linear alkoxy of (5) or C2-C12A linear alkenyl group of (a);
Figure FDA0003370483190000022
independently of one another, represents trans-1, 4-cyclohexylene or 1, 4-phenylene.
2. A positive-working liquid crystal composition according to claim 1, wherein the compound of formula I is selected from one or more of the following compounds:
Figure FDA0003370483190000023
Figure FDA0003370483190000031
Figure FDA0003370483190000041
3. a positive-working liquid crystal composition according to claim 1, wherein the compound of formula II is selected from one or more of the following compounds:
Figure FDA0003370483190000042
Figure FDA0003370483190000051
4. a positive-working liquid crystal composition according to claim 1, wherein the compound of formula III is selected from one or more of the following compounds:
Figure FDA0003370483190000052
Figure FDA0003370483190000061
Figure FDA0003370483190000071
5. the positive liquid crystal composition according to claim 1, wherein the compound represented by formula I accounts for 3-20% of the total weight of the liquid crystal composition.
6. A positive liquid crystal composition according to claim 1, further comprising one or more compounds of formula IV:
Figure FDA0003370483190000081
wherein R is4Is represented by C1-C12Straight chain alkyl group of (1), C1-C12Straight chain alkoxy of (a);
Figure FDA0003370483190000082
to represent
Figure FDA0003370483190000083
Figure FDA0003370483190000084
To represent
Figure FDA0003370483190000085
X3、X4、X5Independently of one another-H, -F, -OCF3(ii) a q represents 1 or 2.
7. A positive-working liquid crystal composition according to claim 6, wherein the compound of formula IV is selected from one or more of the following compounds:
Figure FDA0003370483190000091
wherein R is4Is represented by C1-C12Straight chain alkyl group of (1), C1-C12Linear alkoxy groups of (1).
8. A positive-working liquid crystal composition according to claim 1, further comprising one or more compounds of the general formulae V-A to V-C:
Figure FDA0003370483190000101
wherein R is41、R42Independently of one another represent C1-C7Straight chain alkyl group of (1), C1-C7Linear alkoxy of (5) or C2-C7A linear alkenyl group of (a); z1Represents a single bond, -CH2CH2-、-CH＝CH-、-CF2O-、-OCF2-、-CH2O-、-OCH2-、-COO-、-OCO-、-CF2CF2-、-C4H8-、-CF＝CF-；
p, n independently of one another represent 0 or 1; m represents 1 or 2.
9. A positive-working liquid crystal composition according to claim 8, wherein the compounds of formulae V-A to V-C are selected from one or more of the following compounds:
Figure FDA0003370483190000102
Figure FDA0003370483190000111
Figure FDA0003370483190000121
Figure FDA0003370483190000131
Figure FDA0003370483190000141
Figure FDA0003370483190000151
Figure FDA0003370483190000161
Figure FDA0003370483190000171
Figure FDA0003370483190000181
10. the positive liquid crystal composition according to claim 1, further comprising one or more compounds represented by general formulas VI-1 to VI-9:
Figure FDA0003370483190000182
Figure FDA0003370483190000191
wherein R is51And R52Independently of one another represent C1-C12Straight chain alkyl group of (1), C1-C12Linear alkoxy of (5) or C2-C12Linear alkenyl groups of (a).
11. The positive liquid crystal composition according to claim 1, wherein the positive liquid crystal composition comprises 0.01 to 50% by mass of the compound represented by the general formula II, 1 to 50% by mass of the compound represented by the general formula iii, and 1 to 60% by mass of the compound represented by the general formula IV; the mass content of the compound shown in the general formula V is 1-50%, and the mass content of the compound shown in the general formula VI is 1-40%.
12. The positive liquid crystal composition according to claim 1, further comprising an additive selected from one or more of a radical scavenger, an antioxidant and a UV stabilizer;
the content of the additive is 0-5% of the total mass of the liquid crystal composition.
13. A liquid crystal display comprising the positive liquid crystal composition according to any one of claims 1 to 12.
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