CN115975651A - Liquid crystal composition and display panel - Google Patents
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- CN115975651A CN115975651A CN202211561451.3A CN202211561451A CN115975651A CN 115975651 A CN115975651 A CN 115975651A CN 202211561451 A CN202211561451 A CN 202211561451A CN 115975651 A CN115975651 A CN 115975651A
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- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical class C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 3
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Abstract
The application discloses a liquid crystal composition and a display panel, wherein the liquid crystal composition comprises a first compound with a structural formula of
m is selected from 0, 1 or 2, n is selected from 1 or 2, L1～L6Selected from H, F, cl, br, CN, alkyl or alkoxy groups having 1 to 5 carbon atoms, R1And R is2Selected from H, F, cl, br, I, CN, SCN, NCS, SF5Substituted or unsubstituted alkyl or alkoxy having 1 to 15 carbon atoms, substituted or unsubstituted alkenyl, alkenyloxy, alkynyl or alkynyloxy having 2 to 15 carbon atoms, Z1、Z3、Z2Selected from single bonds, -O-, -S-, -SO2- -OC (O) -, -OC (O) O-, -C.ident.C-substituted or unsubstituted ethylene group, substituted or unsubstituted vinylidene group, substitutedOr an unsubstituted methyleneoxy group, or a salt thereof,
selected from the group consisting of a substituted or unsubstituted heterocyclic ring having 3 to 5 carbon atoms, a substituted or unsubstituted cycloalkyl or cycloalkenyl having 3 to 10 carbon atoms, and a substituted or unsubstituted heteroaryl or aryl having 1 or 2 rings.
Description
Technical Field
The invention relates to the technical field of liquid crystal materials, in particular to a liquid crystal composition and a display panel.
Background
Liquid crystal compounds are widely used in various displays to exhibit betterThe contrast and response time of existing displays are in need of improvement. The optical, electrical and mechanical properties of the liquid crystal molecules depend on the structure and substituents of the liquid crystal molecules. Dielectric constant difference Δε=ε according to longitudinal axis and long axis of liquid crystal molecule∥-ε⊥The liquid crystal may be classified into a positive liquid crystal, a neutral liquid crystal, and a negative liquid crystal. So far, most of the liquid crystals used fall into Δε>0.
When the voltage is 0V, the alignment direction of the liquid crystal molecules in the VA (vertical alignment mode) display is perpendicular to the glass substrate, and the incident light perpendicular to the glass substrate cannot pass through, so that a good dark state effect is achieved. Thus, VA displays typically have negative dielectric anisotropy (Δ∈) and better contrast.
There is a need to develop materials with faster response speeds and higher contrast to adapt to the continued development of displays.
Disclosure of Invention
The embodiment of the invention provides a liquid crystal composition and a display panel, which are used for solving the technical problems that the response speed and contrast ratio of the existing liquid crystal material are to be improved.
In order to solve the problems, the technical scheme provided by the invention is as follows:
the embodiment of the invention provides a liquid crystal composition, which comprises a first compound, wherein the structural general formula of the first compound is shown as formula I:
In some embodiments of the invention, L1～L6Independently of each other, from H or F, but not simultaneously H.
In some embodiments of the invention, R1And R is2Independently of one another selected from H, F, substituted or unsubstituted alkyl having 1 to 7 carbon atoms, substituted or unsubstituted alkoxy having 1 to 7 carbon atoms, substituted or unsubstituted alkenyl having 2 to 7 carbon atoms, substituted or unsubstituted alkenyloxy having 2 to 7 carbon atoms, substituted or unsubstituted alkynyl having 2 to 7 carbon atoms, or substituted or unsubstituted alkynyloxy having 2 to 7 carbon atoms; wherein R is1And R is2R is selected from alkyl, alkoxy, alkenyl, alkenyloxy, alkynyl or alkynyloxy1Terminal group and R of (C)2Is substituted by CN or CF3Monosubstituted or unsubstituted, and/or R1R is R2At least one CH of (a)2The radicals are independently of one another represented by-O-; -C (O) O-, -OC (O) -, -CF2O-、-OCF2-、-CH2CH2-、-CH2O、-OCH2-ch=ch-or-c≡c-substitution and leaving the heteroatom not directly bonded or unsubstituted.
In some embodiments of the invention, R1And R is2Independently of one another, from the group methyl, methoxy, ethyl, ethoxy, propyl, propoxy, butyl, butoxy, pentyl, pentoxy, hexyl or hexoxy.
In some embodiments of the invention, each Z1Each Z3Z is as follows2Are independently selected from the group consisting of single bonds, -O-, -C (O) O-; -OC (O) -, -OC (O) O-, -C≡C-, and ethylene group substituted or unsubstituted by F, or a methyleneoxy group substituted or unsubstituted with F.
In some embodiments of the invention, each
Each->
And +.>
Independently of one another selected from
In some embodiments of the invention, the first compound is selected from at least one of the structural formulas shown in formulas i-1 to i-60:
wherein R is1And R is2Independently of one another selected from H, F, substituted or unsubstituted alkyl having 1 to 7 carbon atoms, substituted or unsubstituted alkoxy having 1 to 7 carbon atoms, substituted or unsubstituted alkenyl having 2 to 7 carbon atoms, substituted or unsubstituted alkenyloxy having 2 to 7 carbon atoms, substituted or unsubstituted alkynyl having 2 to 7 carbon atoms, or substituted or unsubstituted alkynyloxy having 2 to 7 carbon atoms; wherein R is1And R is2Selected from alkyl, alkoxy, alkenyl,R is, in the case of alkenyloxy, alkynyloxy or alkynyloxy1R is R2One or two CH2The radicals are independently of one another represented by-O-; -C (O) O-, -OC (O) -, -CF2O-、-OCF2-、-CH2O、-OCH2Substituted and such that the heteroatoms are not directly bonded or unsubstituted.
In some embodiments of the invention, the liquid crystal composition further comprises a second compound having a structural formula comprising at least one of the formulae ii 1 to ii 9:
In some embodiments of the invention, the liquid crystal composition further comprises a third compound having a structural formula comprising at least one of the formulae iii 1 to iii 9:
The embodiment of the invention also provides a display panel which comprises an array substrate, a color film substrate and a liquid crystal layer, wherein the array substrate and the color film substrate are oppositely arranged, the liquid crystal layer is arranged between the array substrate and the color film substrate in a clamping mode, and the material of the liquid crystal layer comprises the liquid crystal composition in any embodiment.
The beneficial effects of the invention are as follows: the first compound provided by the embodiment of the invention has higher negative dielectric anisotropy, higher clearing point, higher optical anisotropy and the like, and can reduce response time and improve contrast ratio when being applied to a display device.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The embodiment of the invention provides a liquid crystal composition, which comprises a first compound, wherein the structural general formula of the first compound is shown as formula I:
wherein m is an integer from 0 to 2, and n is 1 or 2. In an embodiment of the invention, m is preferably 1 or 2, particularly preferably 1; n is preferably 1 or 2, particularly preferably 1.
L1～L6Independently of one another, from H, F, cl, br, CN, alkyl having from 1 to 5 carbon atoms or alkoxy having from 1 to 5 carbon atoms.
In an embodiment of the invention, L1、L2、L3、L4、L5、L6Independently of one another, H or F is preferred. Since the atomic radius of the F atom is only slightly larger than H, the formation of the liquid crystal phase is not affected.
R1And R is2Independently of one another, selected from H, F, cl, br, I, CN, SCN, NCS, SF5A substituted or unsubstituted alkyl group having 1 to 15 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 15 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 15 carbon atoms, a substituted or unsubstituted alkenyloxy group having 2 to 15 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 15 carbon atoms, or a substituted or unsubstituted alkynyloxy group having 2 to 15 carbon atoms; wherein R is1And R is2R is selected from alkyl, alkoxy, alkenyl, alkenyloxy, alkynyl or alkynyloxy1Terminal group and R of (C)2Is substituted by CN or CF3Monosubstituted or unsubstituted, and/or R1R is R2At least one CH of (a)2The radicals being independently of one another replaced by-O-, -S-, -SO2-、-CO-、-C(O)O-、-OC(O)-、-OC(O)O-、-CF2O-、-OCF2-、-CH2CH2-、-CF2CF2-、-CF2CH2-、-OC(O)--CH2CF2-、-CHF-CHF-、-CH2O-、-OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -ch=ch-or-c≡c-substitution and making the hetero atom not directly bonded.
In embodiments of the present invention, unless otherwise indicated, the term "substituted or unsubstituted" refers to the substitution of an H atom with F, cl, br, or I, and the term "alkyl", "alkenyl" or "alkynyl" refers to a straight or branched chain aliphatic hydrocarbon group having 1 to 15 carbon atoms.
R1And R is2Independently of one another, alkyl groups having 1 to 7 carbon atoms or alkoxy groups having 1 to 7 carbon atoms, particularly preferably alkyl groups having 2 to 5 carbon atoms or alkoxy groups having 2 to 5 carbon atoms, are preferred.
When R is1And R is2When selected from alkyl or alkoxy groups, these alkyl or alkoxy groups may be linear or branched. Each of these groups is preferably straight-chain, has 1 to 7 carbon atoms and is accordingly preferably methyl, methoxy, ethyl, ethoxy, propyl, propoxy, butyl, butoxy, pentyl, pentoxy, hexyl or hexoxy.
R1And R is2Alkenyl groups having 2 to 15 carbon atoms, alkenyloxy groups having 2 to 15 carbon atoms, alkynyl groups having 2 to 15 carbon atoms, or alkynyloxy groups having 2 to 15 carbon atoms may also be preferred.
When R is1And R is2Preferably alkenyl, alkenyloxy, alkynyl or alkynyloxy, these groups may be linear or branched and have at least one carbon-carbon double bond or carbon-carbon triple bond. It is preferably a straight chain alkenyl or alkynyl group having 2 to 7 carbon atoms. Because it is preferably vinyl, prop-1-enyl, prop-2-enyl, but-3-enyl, but-1-enyl, pent-2-enyl, pent-3-enyl, pent-4-enyl, hex-1-enyl, hex-2-enyl, hex-3-enyl, hex-4-enyl, hex-5-enyl, hept-1-enyl, hept-2-enyl, hept-3-enyl, hept-4-enyl, hept-5-enyl, hept-6-enyl, ethynyl, prop-1-ynyl, prop-2-ynyl, but-1-ynyl, but-2-ynyl, but-3-ynyl, pent-1-ynyl, pent-2-ynyl, pent-3-ynyl, pent-4-ynyl, hex-1-ynyl, hex-2-ynyl, hex-3-ynyl, hex-4-ynyl, hex-5-ynyl, hept-1-ynyl, hept-2-alkynyl, hept-3-alkynyl, hept-4-alkynyl, hept-5-ynyl, and may be the isomeric forms E and Z-6-alkynyl. Among alkenyl and alkynyl groups, prop-2-enyl, but-3-enyl, pent-2-enyl, pent-3-enyl, pent-4-enyl, prop-2-ynyl, but-3-ynyl, pent-2-ynyl, pent-3-ynyl or pent-4-ynyl are preferred.
Each Z1Each Z3Z is as follows2Independently of one another, from single bonds, -O-, -S-, -SO2- -OC (O) -, -OC (O) O-; C.ident.C-, substituted or unsubstituted ethylene radical substituted or unsubstituted vinylidene group, substituted or unsubstituted methyleneoxy group. Z is Z1And Z3Different groups may be selected for each occurrence.
Preferably, each Z1Each Z3Z is as follows2Are independently selected from the group consisting of single bonds, -O-, -C (O) O-; -OC (O) -, -OC (O) O-, -C≡C-, and ethylene group substituted or unsubstituted by F, or a methyleneoxy group substituted or unsubstituted with F.
Specifically, each Z1Each Z3Z is as follows2Independently of one another, selected from the group consisting of single bonds, -O-, -C (O) O-, -OC (O) -, -CF2O-、-OCF2-、-CH2CH2-、-CH2O-、-OCH2-, -CH=CH-or-C≡C-.
Each Z1Each Z3Z is as follows2Particularly preferred are single bonds, -O-, -CF2O-,-OCF2-,-CH2CH2-,-CH2O and-OCH2-。
Each of which is
Each->
And +.>
Independently of each other, a substituted or unsubstituted heterocyclic atom having 3 to 5 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkenyl group having 3 to 10 carbon atoms, a substituted or unsubstituted heteroaromatic group having 1 or 2 ring atoms, or a substituted or unsubstituted aromatic group having 1 or 2 ring atoms. />
Specifically, each
Each->
And +.>
Independently of each other selected from->
Preferably, each
Each->
And +.>
Independently of each other selected from->
Specifically, the first compound according to the embodiment of the present invention may be selected from the structural formulae shown in the following formulae I-1 to I-60:
wherein R is1And R is2Independently of one another selected from H, F, substituted or unsubstituted alkyl having 1 to 7 carbon atoms, substituted or unsubstituted alkoxy having 1 to 7 carbon atoms, substituted or unsubstituted alkenyl having 2 to 7 carbon atoms, substituted or unsubstituted alkenyloxy having 2 to 7 carbon atoms, substituted or unsubstituted alkynyl having 2 to 7 carbon atoms, or substituted or unsubstituted alkynyloxy having 2 to 7 carbon atoms; wherein R is1And R is2R is selected from alkyl, alkoxy, alkenyl, alkenyloxy, alkynyl or alkynyloxy1R is R2One or two CH2The radicals being independent of one another can be substituted by-O-, -C (O) O-, -OC (O) -, -CF2O-、-OCF2-、-CH2O、-OCH2Substituted and the heteroatoms are not directly bonded.
Particularly preferably, the structural formula of the first compound is selected from the structural formulae shown in the following formulae IA-1 to IA-36:
the groups or substituents of formula I according to embodiments of the invention, or the groups, substituents or compounds of formula I according to themselves are optically active or stereoisomeric groups, substituents or compounds having an asymmetric center or chiral center, are also included in the invention. The first compounds of the general formula I according to the invention can exist in the form of isomers, such as pure enantiomers, diastereomers, E or Z isomers, or as mixtures of a plurality of isomers in any desired ratio, for example as racemates, E/Z isomer mixtures.
The first compound provided by the embodiment of the invention has higher optical anisotropy, high-definition bright spots and larger dielectric negativity, and can improve the contrast ratio of the display device when being applied to the liquid crystal material of the display device.
Specifically, the synthetic route of the first compound is as follows:
to be used for
The raw materials are subjected to the reaction to obtain
The examples of the present invention are merely illustrative of the synthetic procedures of a part of the structural formula of the first compound, as one skilled in the art can obtain the synthesis of other structural formulas of the first compound according to the synthetic routes described above.
The liquid crystal composition may further comprise a second compound having a structural formula shown in formulas II 1 to II 9:
The second compound can have different dielectric neutrality, optical anisotropy, clearing point and viscosity according to structural formula, and can be used for adjusting the performance of the liquid crystal composition when being applied to the liquid crystal composition, so that the liquid crystal composition meets different application requirements.
Further, the liquid crystal composition may further include a third compound having a structural formula shown in formulas iii 1 to iii 9:
The third compound is a negative dielectric conventional monomer and can be applied to night scenes, and the third compound has different dielectric negativity, optical anisotropy, clearing point and viscosity according to different structural formulas. The performance of the liquid crystal composition is adjusted as a whole by selecting the third compounds with different structural formulas or adjusting the proportion of the third compounds in the liquid crystal composition, so that the liquid crystal composition meets different application requirements.
The liquid crystal composition provided by the embodiment of the invention has the advantages of favorable combination of application parameters, including high optical anisotropy, gao Qingliang points, wide-application-range optical anisotropy and the property of a mixture with ideal liquid crystal phase in a wide temperature range, and is favorable for being applied to various types of displays, such as VA, ECB, PALC, FFS or IPS and other display devices.
Further, in an embodiment of the present invention, the liquid crystal composition comprises the following components in weight percent, relative to the weight of the liquid crystal composition: 1% -95% of a first compound; 1% -90% of a second compound; 1% -90% of a third compound.
Preferably, the liquid crystal composition comprises the following components in percentage by weight: 1% -60% of a first compound; 5% -70% of a second compound; 5% -70% of a third compound.
Particularly preferably, the liquid crystal composition comprises the following components in percentage by weight: 1% -50% of a first compound; 10% -70% of a second compound; 10% -50% of a third compound.
In other embodiments, the liquid crystal composition comprises the following components in weight percent:
1% -70% of a first compound; 10% -70% of a second compound; 10% -50% of a third compound.
Preferably, the liquid crystal composition comprises the following components in percentage by weight: 1% -50% of a first compound; 10% -60% of a second compound; 10% -45% of a third compound.
Particularly preferably, the liquid crystal composition comprises the following components in percentage by weight: 1% -40% of a compound; 10% -50% of a compound; 10% -40% of a compound.
In the embodiment of the invention, the liquid crystal composition can comprise other components such as chiral agents, initiators, polymerization inhibitors, organic solvents, other auxiliary agents and the like according to practical needs besides the first compound, the second compound and the third compound.
The optical anisotropy, clearing point, and viscosity of the liquid crystal composition may be adjusted by formulating the components of the first compound, the second compound, and the third compound, thereby adjusting the liquid crystal properties as a whole.
The preparation of the liquid crystal composition can be carried out by adopting a thermal dissolution method, and comprises the following steps: s10, weighing the first compound, the second compound and the third compound by a balance according to mass percent, wherein the weighing and adding sequence has no specific requirement, and the liquid crystal compounds are generally weighed and mixed at one time in the sequence from low melting point to high melting point; s20, heating and stirring at 60-100 ℃ to fully dissolve and mix the components; s30, cooling to room temperature, and packaging to obtain a target sample.
Tables 1 to 6 show the component distribution and the measurement of each performance parameter of the liquid crystal composition according to the examples of the present invention. Wherein the temperature unit is DEG C; tni represents the clearing point (unit:. Degree. C.) of the liquid crystal composition; Δn represents optical anisotropy at 25 ℃, ne being the refractive index of the extraordinary ray; γ1 represents the rotational viscosity at 25 ℃ (unit: mPa.s); delta epsilon represents dielectric anisotropy at 25 ℃, epsilon is dielectric constant perpendicular to the long axis of the liquid crystal molecule, K11K is the coefficient of elasticity of the stretch33Is the bending modulus of elasticity.
From experimental measurement data, the liquid crystal composition provided by the embodiment of the invention has high delta n, high definition bright point, wide application range and optical anisotropy, and has the properties of a mixture of ideal liquid crystal phases in a wide temperature range. The liquid crystal composition provided by the embodiment of the invention is applied to a display device, and can improve the response speed and contrast of display.
TABLE 1 component partitioning and Performance parameters of the liquid Crystal composition of example 1
TABLE 2 component partitioning and Performance parameters of the liquid Crystal composition of example 2
TABLE 3 component partitioning and Performance parameters of the liquid Crystal composition of example 3
TABLE 4 component partitioning and Performance parameters of the liquid Crystal composition of example 4
TABLE 5 component partitioning and Performance parameters of the liquid Crystal composition of example 5
TABLE 6 component partitioning and Performance parameters of the liquid Crystal composition of example 6
The contrast of the liquid crystal is related to the dielectric anisotropy of the liquid crystal, and when the liquid crystal has dielectric negativity, the contrast can be improved, and the measured data show that the dielectric anisotropy delta epsilon of the liquid crystal composition of the embodiment of the invention is between-4.4 and-3.7, and has higher dielectric negativity, so that the contrast of the liquid crystal composition can be improved.
The response time of the liquid crystal is positively correlated with the rotational viscosity gamma 1 and is in dielectric anisotropyAnisotropy Δε, and coefficient of elasticity K of splay11Is inversely related; in the liquid crystal composition provided by the embodiment of the invention, the first compound has higher dielectric negativity, so that the dielectric negativity of the liquid crystal can be improved, and the response time can be reduced; the second compound has dielectric neutrality and low viscosity, can reduce the viscosity of liquid crystal and reduce response time; the third compound has dielectric negativity, and delta n, tni and viscosity can be adjusted according to requirements, so that the liquid crystal property is adjusted as a whole. From the above measured data, the liquid crystal composition provided in the embodiment of the invention has a rotational viscosity γ1 of 89 to 116 mPas, has a low rotational viscosity, and can reduce the response time; k (K)11Is between 13.5 and 14.9, has higher splay elastic coefficient and can reduce response time; dielectric anisotropy delta epsilon is between-4.4 and-3.7, has higher dielectric negativity, and can reduce response time; the clearing point Tni of the liquid crystal composition is above 87 ℃, has higher clearing point, and can have ideal liquid crystal phase in a wide temperature range.
Based on the above embodiment, as shown in fig. 1, the embodiment of the present invention further provides a display panel 100, which includes an array substrate 10 and a color film substrate 30 disposed opposite to each other, and a liquid crystal layer 20 sandwiched between the array substrate 10 and the color film substrate 30, where the material of the liquid crystal layer 20 includes the liquid crystal composition of the above embodiment. The liquid crystal composition is applied to a display panel, so that the response time of the display panel can be reduced, and the contrast ratio of the display panel can be improved.
The array substrate 10 of the display panel 100 includes a thin film transistor array for driving the liquid crystal layer to emit light. The display panel 100 further includes a backlight module disposed on a side of the array substrate 10 facing away from the liquid crystal layer 20, where the backlight module is configured to provide a backlight source for the liquid crystal layer 20.
The liquid crystal composition can be applied to watches, mobile phones, televisions, computers and other displays, and is applicable to VA, ECB, PALC, FFS or IPS and other types of displays.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above describes in detail a liquid crystal composition and a display panel provided by the embodiments of the present invention, and specific examples are applied herein to illustrate the principles and embodiments of the present invention, and the above description of the embodiments is only for helping to understand the technical solution and core ideas of the present invention; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The liquid crystal composition is characterized by comprising a first compound, wherein the structural general formula of the first compound is shown as formula I:
wherein m is an integer from 0 to 2, and n is 1 or 2;
L1～L6independently of one another selected from H, F, cl, br, CN, alkyl having from 1 to 5 carbon atoms, or alkoxy having from 1 to 5 carbon atoms;
R1and R is2Independently of one another, selected from H, F, cl, br, I, CN, SCN, NCS, SF5A substituted or unsubstituted alkyl group having 1 to 15 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 15 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 15 carbon atoms, a substituted or unsubstituted alkenyloxy group having 2 to 15 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 15 carbon atoms, or a substituted or unsubstituted alkynyloxy group having 2 to 15 carbon atoms; wherein R is1And R is2R is selected from alkyl, alkoxy, alkenyl, alkenyloxy, alkynyl or alkynyloxy1Terminal group and R of (C)2Is substituted by CN or CF3Monosubstituted or unsubstituted, and/or R1R is R2At least one CH of (a)2The radicals being, independently of one another, -O-、-S-、-SO2-、-CO-、-C(O)O-、-OC(O)-、-OC(O)O-、-CF2O-、-OCF2-、-CH2CH2-、-CF2CF2-、-CF2CH2-、-OC(O)--CH2CF2-、-CHF-CHF-、-CH2O-、-OCH2-, -CF=CH-, -CH=CF-, -CF-, -CH=CH-, or-C≡C-substituted and such that the heteroatoms are not directly bonded;
each Z1Each Z3Z is as follows2Independently of one another, from single bonds, -O-, -S-, -SO2- -OC (O) -, -OC (O) O-; C.ident.C-, substituted or unsubstituted ethylene radical a substituted or unsubstituted vinylidene group, a substituted or unsubstituted methyleneoxy group;
each of which is
Each->
And +.>
Independently of each other, a substituted or unsubstituted heterocyclic atom having 3 to 5 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkenyl group having 3 to 10 carbon atoms, a substituted or unsubstituted heteroaromatic group having 1 or 2 ring atoms, or a substituted or unsubstituted aromatic group having 1 or 2 ring atoms.
2. The liquid crystal composition according to claim 1, wherein L1～L6Independently of each other, from H or F, but not simultaneously H.
3. The liquid crystal composition according to claim 1, wherein R1And R is2Independently of one another selected from H, F, substituted or unsubstituted alkyl having 1 to 7 carbon atomsAlkoxy of carbon atoms, substituted or unsubstituted alkenyl of 2 to 7 carbon atoms, substituted or unsubstituted alkenyloxy of 2 to 7 carbon atoms, substituted or unsubstituted alkynyl of 2 to 7 carbon atoms, or substituted or unsubstituted alkynyloxy of 2 to 7 carbon atoms; wherein R is1And R is2R is selected from alkyl, alkoxy, alkenyl, alkenyloxy, alkynyl or alkynyloxy1Terminal group and R of (C)2Is substituted by CN or CF3Monosubstituted or unsubstituted, and/or R1R is R2At least one CH of (a)2The radicals are independently of one another represented by-O-; -C (O) O-, -OC (O) -, -CF2O-、-OCF2-、-CH2CH2-、-CH2O、-OCH2-ch=ch-or-c≡c-substitution and leaving the heteroatom not directly bonded or unsubstituted.
4. A liquid crystal composition according to claim 3, wherein R1And R is2Independently of one another, from the group methyl, methoxy, ethyl, ethoxy, propyl, propoxy, butyl, butoxy, pentyl, pentoxy, hexyl or hexoxy.
5. The liquid crystal composition according to claim 1, wherein each Z1Each Z3Z is as follows2Are independently selected from the group consisting of single bonds, -O-, -C (O) O-; -OC (O) -, -OC (O) O-, -C≡C-, and ethylene group substituted or unsubstituted by F, or a methyleneoxy group substituted or unsubstituted with F.
6. The liquid crystal composition according to claim 1, wherein each of
Each->
and 
Independently of each other selected from->
(A-1)、/>
(A-2)、/>
(A-3)、/>
(A-4)、/>
(A-5)、/>
(A-6)、/>
(A-7)、/>
(A-8)、/>
(A-9)、/>
(A-10)、
(A-11)、/>
(A-12)、/>
(A-13)、/>
(A-14)、/>
(A-15)、
(A-16), or a group represented by any one of the formulae (A-1) to (A-16) in which at least one H atom is independently substituted with F, cl, br.
7. The liquid crystal composition according to claim 1, wherein the first compound is selected from at least one of the structural formulas shown in formulas i-1 to i-42, i-44 to i-60:
wherein R is1And R is2Independently of one another, from H, F, substituted or unsubstituted, having from 1 to 7 carbon atomsAlkyl of a substituent, substituted or unsubstituted alkoxy having 1 to 7 carbon atoms, substituted or unsubstituted alkenyl having 2 to 7 carbon atoms, substituted or unsubstituted alkenyloxy having 2 to 7 carbon atoms, substituted or unsubstituted alkynyl having 2 to 7 carbon atoms, or substituted or unsubstituted alkynyloxy having 2 to 7 carbon atoms; wherein R is1And R is2R is selected from alkyl, alkoxy, alkenyl, alkenyloxy, alkynyl or alkynyloxy1R is R2One or two CH2The radicals are independently of one another represented by-O-; -C (O) O-, -OC (O) -, -CF2O-、-OCF2-、-CH2O、-OCH2Substituted and such that the heteroatoms are not directly bonded or unsubstituted.
8. The liquid crystal composition according to any one of claims 1 to 7, further comprising a second compound having a structural formula comprising at least one of the formulae ii 1 to ii 9:
9. The liquid crystal composition according to any one of claims 1 to 7, further comprising a third compound having a structural formula including at least one of the formulae iii 1 to iii 9:
10. A display panel comprising an array substrate and a color film substrate which are oppositely arranged, and a liquid crystal layer which is arranged between the array substrate and the color film substrate in a sandwiched manner, wherein the material of the liquid crystal layer comprises the liquid crystal composition as claimed in any one of claims 1 to 9.
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