CN117625210A - Liquid crystal composition and display panel - Google Patents
Liquid crystal composition and display panel Download PDFInfo
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- CN117625210A CN117625210A CN202311542452.8A CN202311542452A CN117625210A CN 117625210 A CN117625210 A CN 117625210A CN 202311542452 A CN202311542452 A CN 202311542452A CN 117625210 A CN117625210 A CN 117625210A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 219
- 239000000203 mixture Substances 0.000 title claims abstract description 197
- 150000001875 compounds Chemical class 0.000 claims abstract description 179
- 125000004432 carbon atom Chemical group C* 0.000 claims description 177
- 125000000217 alkyl group Chemical group 0.000 claims description 51
- 125000003342 alkenyl group Chemical group 0.000 claims description 50
- 125000003545 alkoxy group Chemical group 0.000 claims description 46
- 239000000758 substrate Substances 0.000 claims description 35
- 125000005133 alkynyloxy group Chemical group 0.000 claims description 27
- 125000003302 alkenyloxy group Chemical group 0.000 claims description 25
- 125000000304 alkynyl group Chemical group 0.000 claims description 21
- 125000004429 atom Chemical group 0.000 claims description 16
- 125000005415 substituted alkoxy group Chemical group 0.000 claims description 9
- 125000000547 substituted alkyl group Chemical group 0.000 claims description 9
- 125000005017 substituted alkenyl group Chemical group 0.000 claims description 8
- 125000004426 substituted alkynyl group Chemical group 0.000 claims description 8
- 238000006467 substitution reaction Methods 0.000 claims description 6
- 125000005842 heteroatom Chemical group 0.000 claims description 5
- -1 and for example Chemical group 0.000 description 102
- 239000000463 material Substances 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 8
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 5
- 125000004973 1-butenyl group Chemical group C(=CCC)* 0.000 description 4
- 125000004974 2-butenyl group Chemical group C(C=CC)* 0.000 description 4
- 125000004975 3-butenyl group Chemical group C(CC=C)* 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 4
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 4
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 3
- 125000000474 3-butynyl group Chemical group [H]C#CC([H])([H])C([H])([H])* 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 125000004972 1-butynyl group Chemical group [H]C([H])([H])C([H])([H])C#C* 0.000 description 1
- 125000000069 2-butynyl group Chemical group [H]C([H])([H])C#CC([H])([H])* 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920005575 poly(amic acid) Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
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- 238000003756 stirring Methods 0.000 description 1
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Abstract
The embodiment of the invention discloses a liquid crystal composition and a display panel, wherein the liquid crystal composition comprises at least one first compound, at least one second compound, at least one third compound and at least one fourth compound, the first compound has a structure shown as a general formula (I), the second compound has a structure shown as a general formula (II), the third compound has a structure shown as a general formula (III), and the fourth compound has a structure shown as a general formula (IV).
Description
Technical Field
The invention relates to the field of display, in particular to a liquid crystal composition and a display panel.
Background
The liquid crystal display panel utilizes the voltage applied to the liquid crystal layer to realize the regulation and control of the optical performance of the materials in the liquid crystal layer, thereby realizing the display function of the liquid crystal display panel. The quality of the physical properties (e.g., viscosity, clearing point, dielectric anisotropy, optical anisotropy, elastic coefficient, etc.) of the liquid crystal material of the liquid crystal layer affects the product quality of the liquid crystal display panel in terms of, for example, response time. Currently, the performance of materials applied to a liquid crystal layer is still to be improved, resulting in a room for improvement in the product quality of a display panel.
Accordingly, a liquid crystal composition and a display panel are needed to solve the above-mentioned problems.
Disclosure of Invention
Based on the above-mentioned shortcomings in the prior art, the present invention provides a liquid crystal composition and a display panel, wherein the first compound, the second compound, the third compound and the fourth compound are added into the liquid crystal composition, so that the performance of the liquid crystal composition is improved in terms of clearing point, dielectric anisotropy, viscosity and the like, and the product quality of the display panel using the liquid crystal composition is improved.
The invention provides a liquid crystal composition, which comprises at least one first compound, at least one second compound, at least one third compound and at least one fourth compound;
the first compound has a structure shown in a general formula (I):
the second compound has a structure shown as a general formula (II-1) or a general formula (II-2):
the third compound has a structure as shown in any one of the general formulas (III-1) to (III-3):
the fourth compound has a structure shown in a general formula (IV):
wherein R is 1 、R 2 、R 3 R is R 4 Are respectively and independently selected from H, F, cl, br, I, CN, SCN, NCS, SF 5 Substituted or unsubstituted alkyl having 1 to 15 carbon atoms, substituted or unsubstituted alkoxy having 1 to 15 carbon atoms, substituted or unsubstituted alkenyl having 2 to 15 carbon atoms, substituted or unsubstituted alkenyloxy having 2 to 15 carbon atoms, substituted or unsubstituted alkynyl having 2 to 15 carbon atoms, substituted or unsubstituted alkynyloxy having 2 to 15 carbon atoms.
Preferably, a substituted alkyl group having 1 to 15 carbon atoms, a substituted alkoxy group having 1 to 15 carbon atoms, a substituted alkenyl group having 2 to 15 carbon atoms, a substituted alkenyloxy group having 2 to 15 carbon atoms, a substituted alkynyl group having 2 to 15 carbon atoms, and a substituted alkynyloxy group having 2 to 15 carbon atoms satisfy at least one of the following conditions:
the end groups being independently each other by CN or CF 3 Mono-substitution;
one or more of the groups-CH 2 -each independently is represented by-O-, -S-, -SO 2 -、-CO-、-C(O)O-、-OC(O)-、-OC(O)O-、-CF 2 O-、-OCF 2 -、-CH 2 -CH 2 -、-(CH 2 ) 3 -、-CF 2 -CF 2 -、-CF 2 -CH 2 -、-CH 2 -CF 2 -、-CHF-CHF-、-CH 2 O-、-OCH 2 -, -CF=CH-, -CH=CF-, -CF-, -CH=CH-, or-C≡C-, and no direct bond between heteroatoms directly bonded to C;
at least one H in the group is substituted by any one atom of F, cl, br, I.
Preferably, the liquid crystal composition further comprises at least one fifth compound having a structure as shown in general formula (v):
wherein R is 5 R is R 6 Are independently selected from the group consisting ofSubstituted or unsubstituted alkyl having 1 to 10 carbon atoms, substituted or unsubstituted alkoxy having 1 to 10 carbon atoms, substituted or unsubstituted alkenyl having 2 to 10 carbon atoms, substituted or unsubstituted alkenyloxy having 2 to 10 carbon atoms, substituted or unsubstituted alkynyl having 2 to 10 carbon atoms, substituted or unsubstituted alkynyloxy having 2 to 10 carbon atoms, R 5 R is R 6 Is unsubstituted or at least one H is substituted by any one atom of F, cl, br, I.
Preferably, the mass fraction of the fifth compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the fifth compound in the liquid crystal composition is less than or equal to 15%.
Preferably, the liquid crystal composition further comprises at least one sixth compound having a structure as shown in the general formula (VI):
wherein R is 7 R is R 8 Each independently selected from the group consisting of substituted or unsubstituted alkyl groups having 1 to 10 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 10 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyloxy groups having 2 to 10 carbon atoms, R 7 R is R 8 Is unsubstituted or at least one H is substituted by any one atom of F, cl, br, I.
Preferably, the mass fraction of the sixth compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the sixth compound in the liquid crystal composition is less than or equal to 20%.
Preferably, the liquid crystal composition further comprises at least one seventh compound having a structure as shown in formula (VII):
wherein R is 9 R is R 10 Each independently selected from the group consisting of substituted or unsubstituted alkyl groups having 1 to 10 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 10 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyloxy groups having 2 to 10 carbon atoms, R 9 R is R 10 Is unsubstituted or at least one H is substituted by any one atom of F, cl, br, I.
Preferably, the mass fraction of the seventh compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the seventh compound in the liquid crystal composition is less than or equal to 20%.
Preferably, the mass fraction of the first compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the first compound in the liquid crystal composition is less than or equal to 25%;
the mass fraction of the second compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the second compound in the liquid crystal composition is less than or equal to 25%;
The mass fraction of the third compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the third compound in the liquid crystal composition is less than or equal to 25%;
the mass fraction of the fourth compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the fourth compound in the liquid crystal composition is less than or equal to 25%.
The invention also provides a display panel, which comprises a first substrate, a second substrate positioned on the first substrate, and a liquid crystal layer positioned between the first substrate and the second substrate;
wherein the liquid crystal layer comprises the liquid crystal composition.
The invention improves the performance of the liquid crystal composition in terms of clearing point, dielectric anisotropy, viscosity and the like by comprising the first compound, the second compound, the third compound and the fourth compound in the liquid crystal composition, thereby improving the product quality of a display panel using the liquid crystal composition.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for preparing a liquid crystal composition according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and description only, and is not intended to limit the invention. In the present invention, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.
Currently, there is still room for improvement in the quality of a display panel having a liquid crystal layer due to the improvement in the performance of the material of the liquid crystal layer.
The embodiment of the invention provides a liquid crystal composition, which comprises at least one first compound, at least one second compound, at least one third compound and at least one fourth compound;
the first compound has a structure shown in a general formula (I):
the second compound has a structure shown as a general formula (II-1) or a general formula (II-2):
the third compound has a structure as shown in any one of the general formulas (III-1) to (III-3):
the fourth compound has a structure shown in a general formula (IV):
wherein R is 1 、R 2 、R 3 R is R 4 Are respectively and independently selected from H, F, cl, br, I, CN, SCN, NCS, SF 5 Substituted or unsubstituted alkyl having 1 to 15 carbon atoms, substituted or unsubstituted alkoxy having 1 to 15 carbon atoms, substituted or unsubstituted alkenyl having 2 to 15 carbon atoms, substituted or unsubstituted alkenyloxy having 2 to 15 carbon atoms, substituted or unsubstituted alkynyl having 2 to 15 carbon atoms, substituted or unsubstituted alkynyloxy having 2 to 15 carbon atoms.
In the liquid crystal composition, the first compound is a dielectric negative material, the clear point of the first compound is higher, the absolute value of the difference value of the double refractive indexes is larger, the absolute value of the dielectric constant anisotropy value is higher, the viscosity is moderate, and the high temperature resistance of the liquid crystal composition and the response speed of a display panel when the liquid crystal composition is applied to the display panel are improved, so that the product quality of the display panel applying the liquid crystal composition is improved.
In the liquid crystal composition, the second compound and the third compound are dielectric negative materials, and the absolute value of the dielectric constant anisotropy values of the second compound and the third compound is high, the clear point is high, the viscosity is low, the high temperature resistance of the liquid crystal composition and the response speed of a display panel when the liquid crystal composition is applied to the display panel are improved, and therefore the product quality of the display panel applying the liquid crystal composition is improved.
In the liquid crystal composition, the fourth compound is a dielectric negative material, and the fourth compound has high absolute value, high viscosity and high elastic coefficient of dielectric constant anisotropy value, is favorable for adjusting the dielectric constant anisotropy value, viscosity, elastic coefficient and the like of the liquid crystal composition, so that the liquid crystal composition has proper response speed when being applied to a display panel, and the product quality of the display panel applying the liquid crystal composition is improved.
According to the embodiment of the invention, the first compound, the second compound, the third compound and the fourth compound are included in the liquid crystal composition, so that the performance of the liquid crystal composition is improved in the aspects of clearing point, dielectric anisotropy, viscosity and the like, and the product quality of a display panel using the liquid crystal composition is improved.
In some embodiments, substituted alkyl groups having 1-15 carbon atoms, substituted alkoxy groups having 1-15 carbon atoms, substituted alkenyl groups having 2-15 carbon atoms, substituted alkenyloxy groups having 2-15 carbon atoms, substituted alkynyl groups having 2-15 carbon atoms, and substituted alkynyloxy groups having 2-15 carbon atoms satisfy at least one of the following conditions:
the end groups being independently each other by CN or CF 3 Mono-substitution;
one or more of the groups-CH 2 -each independently is represented by-O-, -S-, -SO 2 -、-CO-、-C(O)O-、-OC(O)-、-OC(O)O-、-CF 2 O-、-OCF 2 -、-CH 2 -CH 2 -、-(CH 2 ) 3 -、-CF 2 -CF 2 -、-CF 2 -CH 2 -、-CH 2 -CF 2 -、-CHF-CHF-、-CH 2 O-、-OCH 2 -, -CF=CH-, -CH=CF-, -CF-, -CH=CH-, or-C≡C-, and no direct bond between heteroatoms directly bonded to C;
at least one H in the group is substituted by any one atom of F, cl, br, I.
R 1 、R 2 、R 3 、R 4 At least one of which is selected from the group consisting of a substituted alkyl group having 1 to 15 carbon atoms, a substituted alkoxy group having 1 to 15 carbon atoms, a substituted alkenyl group having 2 to 15 carbon atoms, a substituted alkenyloxy group having 2 to 15 carbon atoms, a substituted alkynyl group having 2 to 15 carbon atoms, and a substituted alkynyloxy group having 2 to 15 carbon atoms, R 1 、R 2 、R 3 、R 4 The terminal groups of at least one of them are each independently H, CN or CF 3 And (3) single substitution.
In some embodiments, R 1 、R 2 、R 3 、R 4 At least one of which is selected from the group consisting of a substituted alkyl group having 1 to 15 carbon atoms, a substituted alkoxy group having 1 to 15 carbon atoms, a substituted alkenyl group having 2 to 15 carbon atoms, a substituted alkenyloxy group having 2 to 15 carbon atoms, a substituted alkynyl group having 2 to 15 carbon atoms, and a substituted alkynyloxy group having 2 to 15 carbon atoms, R 1 、R 2 、R 3 、R 4 One or more-CH of at least one of them 2 -each independently is represented by-O-, -S-, -SO 2 -、-CO-、-C(O)O-、-OC(O)-、-OC(O)O-、-CF 2 O-、-OCF 2 -、-CH 2 -CH 2 -、-(CH 2 ) 3 -、-CF 2 -CF 2 -、-CF 2 -CH 2 -、-CH 2 -CF 2 -、-CHF-CHF-、-CH 2 O-、-OCH 2 -, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH-or-C≡C-substitution, and the heteroatoms directly bonded to C are not directly bonded.
In some embodimentsWherein R is 1 、R 2 、R 3 、R 4 At least one of which is selected from H, a substituted alkyl group having 1 to 15 carbon atoms, a substituted alkoxy group having 1 to 15 carbon atoms, a substituted alkenyl group having 2 to 15 carbon atoms, a substituted alkenyloxy group having 2 to 15 carbon atoms, a substituted alkynyl group having 2 to 15 carbon atoms, or a substituted alkynyloxy group having 2 to 15 carbon atoms, R 1 、R 2 、R 3 、R 4 At least one H in at least one of them is substituted by any one atom of F, cl, br, I.
In some embodiments, any H, terminal group, or-CH in an unsubstituted alkyl group having 1-15 carbon atoms, an unsubstituted alkoxy group having 1-15 carbon atoms, an unsubstituted alkenyl group having 2-15 carbon atoms, an unsubstituted alkenyloxy group having 2-15 carbon atoms, an unsubstituted alkynyl group having 2-15 carbon atoms, or an unsubstituted alkynyloxy group having 2-15 carbon atoms, an unsubstituted alkyl group having 1-15 carbon atoms, an unsubstituted alkoxy group having 1-15 carbon atoms, an unsubstituted alkenyl group having 2-15 carbon atoms, an unsubstituted alkenyloxy group having 2-15 carbon atoms, an unsubstituted alkynyloxy group having 2-15 carbon atoms, or an unsubstituted alkynyloxy group having 2-15 carbon atoms 2 -all unsubstituted.
In some embodiments, R 1 、R 2 、R 3 R is R 4 Each independently selected from H, F, cl, br, 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, substituted or unsubstituted alkynyloxy having 2 to 7 carbon atoms. When R is 1 And/or R 2 Selected from the group consisting of substituted alkyl, substituted alkoxy, substituted alkenyl, substituted alkenyloxy, substituted alkynyl, substituted alkynyloxy, R 1 And/or R 2 Is substituted with any one atom of F, cl, br, I. When R is 3 And/or R 4 Selected from substituted alkyl, substituted alkoxy, substituted alkeneSubstituted alkenyloxy, substituted alkynyloxy, R when substituted alkynyloxy 3 And/or R 4 Is substituted with any one atom of F, cl, br, I.
Preferably, R 1 、R 2 、R 3 R is R 4 Each independently selected from H, F, unsubstituted alkyl having 1 to 7 carbon atoms, unsubstituted alkoxy having 1 to 7 carbon atoms, unsubstituted alkenyl having 2 to 7 carbon atoms, unsubstituted alkenyloxy having 2 to 7 carbon atoms, unsubstituted alkynyl having 2 to 7 carbon atoms, and unsubstituted alkynyloxy having 2 to 7 carbon atoms.
Preferably, R 1 、R 2 、R 3 R is R 4 Each independently selected from H, F, unsubstituted alkyl having 1 to 5 carbon atoms, unsubstituted alkoxy having 1 to 5 carbon atoms, unsubstituted alkenyl having 2 to 5 carbon atoms.
In some embodiments, when R 1 、R 2 、R 3 R is R 4 Each independently selected from the group consisting of unsubstituted alkyl, unsubstituted alkenyl, and unsubstituted alkynyl, is an aliphatic hydrocarbon group.
In some embodiments, when R 1 、R 2 、R 3 R is R 4 When each is independently selected from unsubstituted alkoxy groups, the unsubstituted alkoxy groups may be unsubstituted straight-chain alkoxy groups or unsubstituted branched alkoxy groups, and are preferably unsubstituted straight-chain alkoxy groups, and for example, methoxy, ethoxy, propoxy, butoxy, pentoxy, hexoxy, heptoxy, and the like.
In some embodiments, when R 1 、R 2 、R 3 R is R 4 When each is independently selected from unsubstituted alkyl groups, the unsubstituted alkyl groups may be unsubstituted straight chain alkyl groups or unsubstituted branched chain alkyl groups, preferably unsubstituted straight chain alkyl groups; r is R 1 R is R 2 When each is independently selected from unsubstituted straight chain alkyl groups having 1 to 7 carbon atoms, it may be selected from, for example, methyl, ethyl, propyl, ding Ji, pentyl, hexyl or heptyl.
When R is 1 、R 2 、R 3 R is R 4 When each is independently selected from unsubstituted alkenyl, the unsubstituted alkenyl may be unsubstituted straight chain alkenyl or unsubstituted branched alkenyl, and the alkenyl may be an isomer of the E configuration and Z configuration and have at least one carbon-carbon double bond, and may be selected from unsubstituted straight chain alkenyl having, for example, 2 to 7 carbon atoms, more preferably vinyl, prop-1-enyl, prop-2-enyl, but-1-enyl, but-2-enyl, but-3-enyl, pent-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 and the like.
When R is 1 、R 2 、R 3 R is R 4 When each is independently selected from unsubstituted alkynyl, the unsubstituted alkynyl may be unsubstituted straight-chain alkynyl or unsubstituted branched-chain alkynyl and has at least one carbon-carbon triple bond, and may be selected from unsubstituted straight-chain alkynyl having, for example, 2 to 7 carbon atoms, more preferably, 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-ynyl, hept-3-ynyl, hept-4-ynyl, hept-5-ynyl or hept-6-ynyl and the like; further preferred are prop-2-ynyl, but-3-ynyl, pent-2-ynyl, pent-3-ynyl or pent-4-ynyl.
In some embodiments, the first compound is selected from the following compounds:
etc.
In some embodiments, the second compound is selected from the following compounds:
etc.
In some embodiments, the third compound is selected from the following compounds:
etc.
In some embodiments, the fourth compound is selected from the following compounds:
etc.
In some embodiments, the liquid crystal composition further comprises at least one fifth compound having a structure as shown in formula (v):
wherein R is 5 R is R 6 Each independently selected from the group consisting of substituted or unsubstituted alkyl groups having 1 to 10 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 10 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyloxy groups having 2 to 10 carbon atoms, R 5 R is R 6 Is unsubstituted or at least one H is substituted by any one atom of F, cl, br, I.
In the liquid crystal composition, the fifth compound has higher absolute value of the difference of the double refractive indexes and low viscosity, and is beneficial to adjusting the optical anisotropy, viscosity and other properties of the liquid crystal composition, so that the product quality of the display panel when the liquid crystal composition is applied to the display panel is improved.
In some embodiments, substituted alkyl groups having 1-10 carbon atoms, substituted alkoxy groups having 1-10 carbon atoms, substituted alkenyl groups having 2-10 carbon atoms, substituted alkenyloxy groups having 2-10 carbon atoms, substituted alkynyl groups having 2-10 carbon atoms, and substituted alkynyloxy groups having 2-10 carbon atoms satisfy at least one of the following conditions:
the end groups being independently each other by CN or CF 3 Mono-substitution;
one or more of the groups-CH 2 -each independently is represented by-O-, -S-, -SO 2 -、-CO-、-C(O)O-、-OC(O)-、-OC(O)O-、-CF 2 O-、-OCF 2 -、-CH 2 -CH 2 -、-(CH 2 ) 3 -、-CF 2 -CF 2 -、-CF 2 -CH 2 -、-CH 2 -CF 2 -、-CHF-CHF-、-CH 2 O-、-OCH 2 -, -CF=CH-, -CH=CF-, -CF-, -CH=CH-, or-C≡C-, and no direct bond between heteroatoms directly bonded to C;
at least one H in the group is substituted by any one atom of F, cl, br, I.
In some embodiments, R 5 R is R 6 Each independently selected from substituted or unsubstituted alkyl groups having 1 to 7 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 7 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 7 carbon atoms. Preferably, R 5 R is R 6 Each independently selected from the group consisting of unsubstituted alkyl groups having 1 to 7 carbon atoms, unsubstituted alkoxy groups having 1 to 7 carbon atoms, and unsubstituted alkenyl groups having 2 to 7 carbon atoms.
More preferably, R 5 R is R 6 Each independently selected from the group consisting of unsubstituted alkyl groups having 1 to 5 carbon atoms, unsubstituted alkoxy groups having 1 to 5 carbon atoms, and unsubstituted alkenyl groups having 2 to 5 carbon atoms.
In some embodiments, when R 5 R is R 6 When independently selected from unsubstituted alkoxy groups, the unsubstituted alkoxy groups may be unsubstituted straight chain alkoxy groups or unsubstituted branched alkoxy groups, preferably unsubstituted straight chain alkoxy groups, e.g., methoxy, ethoxyPropoxy, butoxy, pentoxy, hexoxy, heptoxy, and the like.
In some embodiments, when R 5 R is R 6 When each is independently selected from unsubstituted alkyl groups, the unsubstituted alkyl groups may be unsubstituted straight chain alkyl groups or unsubstituted branched chain alkyl groups, preferably unsubstituted straight chain alkyl groups; r is R 5 R is R 6 When each is independently selected from unsubstituted straight chain alkyl groups having 1 to 7 carbon atoms, it may be selected from, for example, methyl, ethyl, propyl, ding Ji, pentyl, hexyl or heptyl.
When R is 5 R is R 6 When each is independently selected from unsubstituted alkenyl, the unsubstituted alkenyl may be unsubstituted straight chain alkenyl or unsubstituted branched alkenyl, and the alkenyl may be an isomer of the E configuration and Z configuration and have at least one carbon-carbon double bond, and may be selected from unsubstituted straight chain alkenyl having, for example, 2 to 7 carbon atoms, more preferably vinyl, prop-1-enyl, prop-2-enyl, but-1-enyl, but-2-enyl, but-3-enyl, pent-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 and the like.
In some embodiments, the fifth compound is selected from the following compounds:
etc.
In some embodiments, the liquid crystal composition further comprises at least one sixth compound having a structure according to formula (VI):
wherein R is 7 R is R 8 Each independently selected from substituted or unsubstituted alkyl groups having 1 to 10 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 10 carbon atoms, and havingSubstituted or unsubstituted alkenyl of 2 to 10 carbon atoms, substituted or unsubstituted alkenyloxy of 2 to 10 carbon atoms, substituted or unsubstituted alkynyl of 2 to 10 carbon atoms, substituted or unsubstituted alkynyloxy of 2 to 10 carbon atoms, R 7 R is R 8 Is unsubstituted or at least one H is substituted by any one atom of F, cl, br, I.
In the liquid crystal composition, the sixth compound is a dielectric negative material, has higher clearing point, higher absolute value of the difference value of the double refractive indexes and lower viscosity, and is beneficial to adjusting the optical anisotropy, viscosity, clearing point and other performances of the liquid crystal composition, so that the product quality of the display panel when the liquid crystal composition is applied to the display panel is improved.
In some embodiments, R 7 R is R 8 Each independently selected from substituted or unsubstituted alkyl groups having 1 to 7 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 7 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 7 carbon atoms. Preferably, R 7 R is R 8 Each independently selected from the group consisting of unsubstituted alkyl groups having 1 to 7 carbon atoms, unsubstituted alkoxy groups having 1 to 7 carbon atoms, and unsubstituted alkenyl groups having 2 to 7 carbon atoms.
More preferably, R 7 R is R 8 Each independently selected from the group consisting of unsubstituted alkyl groups having 1 to 5 carbon atoms, unsubstituted alkoxy groups having 1 to 5 carbon atoms, and unsubstituted alkenyl groups having 2 to 5 carbon atoms.
In some embodiments, when R 7 R is R 8 When each is independently selected from unsubstituted alkoxy groups, the unsubstituted alkoxy groups may be unsubstituted straight-chain alkoxy groups or unsubstituted branched alkoxy groups, and are preferably unsubstituted straight-chain alkoxy groups, and for example, methoxy, ethoxy, propoxy, butoxy, pentoxy, hexoxy, heptoxy, and the like.
In some embodiments, when R 7 R is R 8 When each is independently selected from unsubstituted alkyl groups, the unsubstituted alkyl groups may be unsubstituted straight chain alkyl groups or unsubstituted branched chain alkyl groups, preferably unsubstituted straight chain alkyl groups; r is R 7 R is R 8 When each is independently selected from unsubstituted straight chain alkyl groups having 1 to 7 carbon atoms, it may be selected from, for example, methyl, ethyl, propyl, ding Ji, pentyl, hexyl or heptyl.
When R is 7 R is R 8 When each is independently selected from unsubstituted alkenyl, the unsubstituted alkenyl may be unsubstituted straight chain alkenyl or unsubstituted branched alkenyl, and the alkenyl may be an isomer of the E configuration and Z configuration and have at least one carbon-carbon double bond, and may be selected from unsubstituted straight chain alkenyl having, for example, 2 to 7 carbon atoms, more preferably vinyl, prop-1-enyl, prop-2-enyl, but-1-enyl, but-2-enyl, but-3-enyl, pent-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 and the like.
In some embodiments, the sixth compound is selected from the following compounds:
etc.
In some embodiments, the liquid crystal composition further comprises at least one seventh compound having a structure according to formula (VII):
wherein R is 9 R is R 10 Each independently selected from the group consisting of substituted or unsubstituted alkyl groups having 1 to 10 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 10 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyloxy groups having 2 to 10 carbon atoms, R 9 R is R 10 Is unsubstituted or at least one H is substituted by any one atom of F, cl, br, I.
In the liquid crystal composition, the seventh compound is a dielectric negative material, has high clearing point and high absolute value of the difference value of double refractive indexes, and is beneficial to adjusting the optical anisotropy, clearing point and other performances of the liquid crystal composition, so that the product quality of the display panel when the liquid crystal composition is applied to the display panel is improved.
In some embodiments, R 9 R is R 10 Each independently selected from substituted or unsubstituted alkyl groups having 1 to 7 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 7 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 7 carbon atoms. Preferably, R 9 R is R 10 Each independently selected from the group consisting of unsubstituted alkyl groups having 1 to 7 carbon atoms, unsubstituted alkoxy groups having 1 to 7 carbon atoms, and unsubstituted alkenyl groups having 2 to 7 carbon atoms.
More preferably, R 9 R is R 10 Each independently selected from the group consisting of unsubstituted alkyl groups having 1 to 5 carbon atoms, unsubstituted alkoxy groups having 1 to 5 carbon atoms, and unsubstituted alkenyl groups having 2 to 5 carbon atoms.
In some embodiments, when R 9 R is R 10 When each is independently selected from unsubstituted alkoxy groups, the unsubstituted alkoxy groups may be unsubstituted straight-chain alkoxy groups or unsubstituted branched alkoxy groups, and are preferably unsubstituted straight-chain alkoxy groups, and for example, methoxy, ethoxy, propoxy, butoxy, pentoxy, hexoxy, heptoxy, and the like.
In some embodiments, when R 9 R is R 10 When each is independently selected from unsubstituted alkyl groups, the unsubstituted alkyl groups may be unsubstituted straight chain alkyl groups or unsubstituted branched chain alkyl groups, preferably unsubstituted straight chain alkyl groups; r is R 9 R is R 10 When each is independently selected from unsubstituted straight chain alkyl groups having 1 to 7 carbon atoms, it may be selected from, for example, methyl, ethyl, propyl, ding Ji, pentyl, hexyl or heptyl.
When R is 9 R is R 10 When independently selected from unsubstituted alkenyl groups, the unsubstituted alkenyl groups may be unsubstituted straight-chain alkenyl groups or unsubstitutedThe alkenyl group may be an isomer of the E configuration and the Z configuration and has at least one carbon-carbon double bond, and may be selected from, for example, unsubstituted straight-chain alkenyl groups having 2 to 7 carbon atoms, more preferably vinyl, prop-1-enyl, prop-2-enyl, but-1-enyl, but-2-enyl, but-3-enyl, pent-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 and the like.
In some embodiments, the seventh compound is selected from the following compounds:
Etc.
In some embodiments, the liquid crystal composition further includes an eighth compound, which may be selected from at least one of the following compounds:
etc.
In the liquid crystal composition, the eighth compound is used for comprehensively adjusting the viscosity, the clearing point, the dielectric anisotropy, the optical anisotropy, the elastic coefficient and other properties of the liquid crystal composition, so that the product quality of the display panel when the liquid crystal composition is applied to the display panel is improved.
In some embodiments, the mass fraction of the first compound in the liquid crystal composition is greater than or equal to 1%, the mass fraction of the first compound in the liquid crystal composition is less than or equal to 25%, e.g., the mass fraction of the first compound may be 2%, 3%, 5%, 8%, 10%, 12%, 14%, 15%, 18%, 20%, 23%, etc.; the mass fraction of the second compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the second compound in the liquid crystal composition is less than or equal to 25%, for example, the mass fraction of the second compound may be 1.5%, 2%, 3%, 5%, 8%, 10%, 12%, 14%, 15%, 18%, 20%, 23%, or the like; the mass fraction of the third compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the third compound in the liquid crystal composition is less than or equal to 25%, for example, the mass fraction of the third compound may be 1.5%, 2%, 3%, 5%, 8%, 10%, 12%, 14%, 15%, 18%, 20%, 23%, or the like. The mass fraction of the fourth compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the fourth compound in the liquid crystal composition is less than or equal to 25%, for example, the mass fraction of the fourth compound may be 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 15%, 18%, 20%, 23%, or the like.
Preferably, the mass fraction of the first compound in the liquid crystal composition is greater than or equal to 3%, and the mass fraction of the first compound in the liquid crystal composition is less than or equal to 15%; the mass fraction of the second compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the second compound in the liquid crystal composition is less than or equal to 15%; the mass fraction of the third compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the third compound in the liquid crystal composition is less than or equal to 15%; the mass fraction of the fourth compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the fourth compound in the liquid crystal composition is less than or equal to 10%.
In some embodiments, when the liquid crystal composition further includes the fifth compound, the mass fraction of the fifth compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the fourth compound in the liquid crystal composition is less than or equal to 15%, for example, may be 2%, 3%, 5%, 8%, 10%, 12%, 15%, etc.
In some embodiments, when the liquid crystal composition further includes the sixth compound, the mass fraction of the sixth compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the sixth compound in the liquid crystal composition is less than or equal to 20%, for example, may be 2%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, and the like.
In some embodiments, when the liquid crystal composition further includes the seventh compound, the mass fraction of the seventh compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the seventh compound in the liquid crystal composition is less than or equal to 20%, for example, may be 2%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, etc.
In some embodiments, the liquid crystal composition has a difference in birefringence at 25 ℃ of greater than or equal to 0.09, and the liquid crystal composition has a difference in birefringence at 25 ℃ of less than or equal to 0.22, for example: 0.096, 0.1, 0.105, 0.11, 0.115, 0.12, 0.125, 0.15, 0.175, 0.2, 0.21, etc., so that the optical anisotropy of the liquid crystal composition is in a proper range, the light transmittance of the liquid crystal composition is matched with the layer thickness of the liquid crystal layer in the display panel, so that the light transmittance of the display panel is in a proper range.
In some embodiments, the liquid crystal composition has a rotational viscosity at 25 ℃ of greater than or equal to 40 mPa-s and the liquid crystal composition has a rotational viscosity at 25 ℃ of less than or equal to 90 mPa-s, for example: 45 mPas, 50 mPas, 55 mPas, 60 mPas, 65 mPas, 70 mPas, 75 mPas, 80 mPas, 85 mPas, 88 mPas, etc. to bring the rotational viscosity of the liquid crystal composition within a suitable range, increasing the rotational speed of the liquid crystal composition and ensuring that the response time of a display panel to which the liquid crystal composition is applied is within a suitable range.
In some embodiments, the liquid crystal composition has a bending modulus of elasticity greater than or equal to 10 and the liquid crystal composition has a bending modulus of elasticity less than or equal to 26, for example: 11. 12, 13, 14, 15, 18, 20, 22, 24, 25, etc.; and/or the liquid crystal composition has a splay elastic modulus of greater than or equal to 10, and the liquid crystal composition has a splay elastic modulus of less than or equal to 26, for example: 12. 13, 14, 15, 18, 20, 22, 24, 25, etc.; the flexural modulus of elasticity of the liquid crystal composition and/or the splay modulus of elasticity of the liquid crystal composition are within the above ranges, so that the liquid crystal composition can obtain an average value of proper elastic coefficients, and the response speed of the display panel when the liquid crystal composition is applied to a display surface can be effectively improved, so that a faster response time can be obtained.
In some embodiments, the liquid crystal composition has a dielectric anisotropy value at 25 ℃ of less than-3.9, and the liquid crystal composition has a dielectric anisotropy value at 25 ℃ of greater than or equal to-5, for example: -4.8, -4.6, -4.5, -4.3, -4, etc. to facilitate reducing a driving voltage required to drive the liquid crystal composition, thereby reducing a driving voltage of a liquid crystal display panel to which the liquid crystal composition is applied, reducing power consumption of the liquid crystal display panel to which the liquid crystal composition is applied.
In some embodiments, the clearing point of the liquid crystal composition is preferably 78.1 ℃ to 135 ℃, for example, the clearing point of the liquid crystal composition may be 79 ℃, 80 ℃, 82 ℃, 84 ℃, 88 ℃, 90 ℃, 92 ℃, 95 ℃, 100 ℃, 105 ℃, 110 ℃, 115 ℃, 120 ℃, 125 ℃, 130 ℃, etc. to avoid a decrease in the high temperature resistance of the liquid crystal composition caused by an excessively low clearing point of the liquid crystal composition.
Referring to fig. 1, an exemplary preparation method of the liquid crystal composition provided by the present invention is as follows:
the preparation method of the liquid crystal composition comprises the following steps:
s100, weighing and mixing the first compound, the second compound, the third compound and the fourth compound according to the mass percentage in a first sequence to obtain a first mixture.
The first order is preferably that the first compound, the second compound, and the third compound are weighed and mixed in this order from the low melting point to the high melting point.
In some embodiments, when at least one of the fifth compound, the sixth compound, the seventh compound, and the eighth compound is further included in the liquid crystal composition, the first mixture further includes at least one of the fifth compound, the sixth compound, the seventh compound, and the eighth compound.
S200, stirring the first mixture at a first heating temperature to thoroughly mix the first compound, the second compound, the third compound, and the fourth compound in the first mixture.
The first heating temperature is preferably 60 ℃ to 100 ℃.
And S300, cooling the first mixture to room temperature and packaging to obtain the liquid crystal composition.
Exemplary combinations of the liquid crystal compositions of the present invention are shown in the following exemplary embodiments 1 to 3.
Example 1
The structural formula and mass fraction of each compound in the liquid crystal composition selected in this example are shown in table 1:
Table 1: components of liquid Crystal composition
/>
The liquid crystal composition obtained in example 1 has the following performance parameters: tni 80.6 ℃, gamma 1 :69.2mPa·s，Δn:0.1098，ne:1.5890，Δε:-4.4，ε ⊥ :7.5，K 11 :14.52，K 33 13.32, the liquid crystal composition is placed for 480 hours at the temperature of minus 20 ℃ without crystal precipitation. Wherein Tni represents a clearing point of the liquid crystal composition; gamma ray 1 Represents the rotational viscosity of the liquid crystal composition at 25 ℃; Δn is the difference in birefringence of the liquid crystal composition, represents the optical anisotropy of the liquid crystal composition at 25 ℃, and ne represents the extraordinary property of the liquid crystal compositionRefractive index of light; delta epsilon represents the dielectric constant anisotropy value of the liquid crystal composition at 25 ℃; epsilon ⊥ A value representing the dielectric constant of the liquid crystal composition in a direction perpendicular to the long axis of the liquid crystal molecules; k (K) 11 Represents the bending modulus, K, of the liquid crystal composition 33 Represents the splay elastic modulus of the liquid crystal composition.
Example 2
The structural formula and mass fraction of each compound in the liquid crystal composition selected in this example are shown in table 2:
table 2: components of liquid Crystal composition
/>
The liquid crystal composition obtained in example 2 had the following performance parameters: tni 80 ℃, gamma 1 :68.8mPa·s，Δn:0.1102，ne:1.5920，Δε:-4.23，ε ⊥ :7.51，K 11 :14.43，K 33 13.27, the liquid crystal composition is placed for 480 hours at the temperature of minus 20 ℃ without crystal precipitation.
Example 3
The structural formula and mass fraction of each compound in the liquid crystal composition selected in this example are shown in table 3:
Table 3: components of liquid Crystal composition
/>
The liquid crystal composition obtained in example 3 had the following performance parameters: tni at 78.9 ℃, gamma 1 :70.98mPa·s，Δn:0.1123，ne:1.5837，Δε:-4.31，ε ⊥ :7.79，K 11 :14.08，K 33 13.27, the liquid crystal composition is placed for 480 hours at the temperature of minus 20 ℃ without crystal precipitation.
Comparative example 1
The structural formula and mass fraction of each compound in the liquid crystal composition selected in this comparative example are shown in table 4:
table 4: components of liquid Crystal composition
/>
The liquid crystal composition obtained in comparative example 1 had the following performance parameters: tni at 78 ℃, gamma 1 :94mPa·sΔn:0.109，ne:1.596，Δε:-3.89，ε ⊥ :7.9，K 11 :14.3，K 33 14.9, the liquid crystal composition is placed for 480 hours at the temperature of minus 20 ℃ without crystal precipitation.
The 3 groups of liquid crystal compositions provided in the above examples 1 to 3 have clear points of 78.9 ℃ to 80.6 ℃ so that the liquid crystal composition has good high temperature resistance; the rotational viscosity at 25 ℃ is between 68.8 mPas and 70.98 mPas, so that the liquid crystal composition has good rotational speed, and the response time of the liquid crystal composition is shortened; the difference in birefringence at 25 ℃ is between 0.1098 and 0.1123, so that the display panel has suitable light transmittance when the liquid crystal composition is applied to the display panel; the dielectric anisotropy value at 25 ℃ is between-4.4 and-4.23, which is favorable for driving the liquid crystal composition at a lower driving voltage, thereby reducing the power consumption of a display panel using the liquid crystal composition; the liquid crystal composition has a bending elastic coefficient of 14.08 to 14.52 and a splay elastic coefficient of 13.27 to 13.32, which is beneficial to shortening the response time of a display panel when the liquid crystal composition is applied to a display surface.
In examples 1 to 3, the liquid crystal compositions of examples 1 to 3 were provided with the first compound, the second compound, the third compound and the fourth compound by adding the first compound and the third compound to the liquid crystal composition, as compared with comparative example 1, so that the viscosity of the liquid crystal compositions of examples 1 to 3 was effectively reduced, the clearing point was increased, and the absolute value of the difference in dielectric anisotropy values of the liquid crystal compositions of examples 1 to 3 was made larger, thereby more effectively improving the response speed and heat resistance of the liquid crystal compositions of examples 1 to 3, and improving the product quality of display panels to which the liquid crystal compositions were applied.
Referring to fig. 2, the embodiment of the invention further provides a display panel 100, where the display panel 100 includes a first substrate 101, a second substrate 102 disposed on the first substrate 101, and a liquid crystal layer 103 disposed between the first substrate 101 and the second substrate 102. Wherein the liquid crystal layer 103 comprises a liquid crystal composition as described above.
The first substrate 101 may be an array substrate, and the second substrate 102 may be a color film substrate. In some embodiments, when the first substrate 101 is an array substrate, the first substrate 101 includes a first substrate, an active layer on the substrate, a first insulating layer on the active layer, a gate layer on the first insulating layer, a second insulating layer on the gate layer, a source drain layer on the second insulating layer, and a third insulating layer on the source drain layer, where the source drain layer includes a source and a drain. The display panel further comprises a common electrode layer and a pixel electrode layer, wherein the pixel electrode layer is positioned on one side, far away from the first substrate, of the third insulating layer, the pixel electrode layer comprises a pixel electrode, and the pixel electrode is electrically connected with the source electrode or the drain electrode. The common electrode layer includes a common electrode, and the common electrode layer may be disposed on the first substrate 101, and the common electrode layer is located between the pixel electrode layer and the source/drain electrode layer, or on a side of the pixel electrode layer away from the first substrate; the common electrode layer may be disposed with the second substrate 102, the second substrate 102 includes a second substrate, and the common electrode layer is located at a side of the second substrate near the liquid crystal layer. The display panel further comprises a color film layer, wherein the color film layer can be arranged on one side of the first substrate close to the liquid crystal layer or one side of the second substrate close to the liquid crystal layer.
In some embodiments, the display panel 100 further includes a first alignment layer between the first substrate 101 and the liquid crystal layer 103, and a second alignment layer between the second substrate 102 and the liquid crystal layer 103. The first alignment layer and/or the second alignment layer comprises a polymer derived from polyimide or other polyamic acid.
The display panel 100 may be a display panel of a display mode such as VA (Vertical Alignment ), ECB (Electrically Controlled Birefringence, electrically controlled birefringence), FFS (Fringe Field Switching ), PALC (Plasma Addressed Liquid Crystal, plasma addressed liquid crystal), or IPS (In-plane switching).
The invention improves the performance of the liquid crystal composition in terms of clearing point, dielectric anisotropy, viscosity and the like by comprising the first compound, the second compound, the third compound and the fourth compound in the liquid crystal composition, thereby improving the product quality of a display panel using the liquid crystal composition.
The embodiment of the invention discloses a liquid crystal composition and a display panel, wherein the liquid crystal composition comprises at least one first compound, at least one second compound, at least one third compound and at least one fourth compound, the first compound has a structure shown as a general formula (I), the second compound has a structure shown as a general formula (II), the third compound has a structure shown as a general formula (III), and the fourth compound has a structure shown as a general formula (IV).
The foregoing has outlined a detailed description of a liquid crystal composition and display panel provided by the embodiments of the present invention, wherein specific examples are provided herein to illustrate the principles and embodiments of the present invention, and the above examples are provided to assist in understanding the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present invention, the present description should not be construed as limiting the present invention.
Claims (10)
1. A liquid crystal composition comprising at least one first compound, at least one second compound, at least one third compound, and at least one fourth compound;
the first compound has a structure shown in a general formula (I):
the second compound has a structure shown as a general formula (II-1) or a general formula (II-2):
the third compound has a structure as shown in any one of the general formulas (III-1) to (III-3):
the fourth compound has a structure shown in a general formula (IV):
wherein R is 1 、R 2 、R 3 R is R 4 Are respectively and independently selected from H, F, cl, br, I, CN, SCN, NCS, SF 5 Substituted or unsubstituted alkyl having 1 to 15 carbon atoms, substituted or unsubstituted alkoxy having 1 to 15 carbon atoms, substituted or unsubstituted alkenyl having 2 to 15 carbon atoms, substituted or unsubstituted alkenyloxy having 2 to 15 carbon atoms, substituted or unsubstituted alkynyl having 2 to 15 carbon atoms, substituted or unsubstituted alkynyloxy having 2 to 15 carbon atoms.
2. The liquid crystal composition according to claim 1, wherein the substituted alkyl group having 1 to 15 carbon atoms, the substituted alkoxy group having 1 to 15 carbon atoms, the substituted alkenyl group having 2 to 15 carbon atoms, the substituted alkenyloxy group having 2 to 15 carbon atoms, the substituted alkynyl group having 2 to 15 carbon atoms, and the substituted alkynyloxy group having 2 to 15 carbon atoms satisfy at least one of the following conditions:
the end groups being independently each other by CN or CF 3 Mono-substitution;
one or more of the groups-CH 2 -each independently is represented by-O-, -S-, -SO 2 -、-CO-、-C(O)O-、-OC(O)-、-OC(O)O-、-CF 2 O-、-OCF 2 -、-CH 2 -CH 2 -、-(CH 2 ) 3 -、-CF 2 -CF 2 -、-CF 2 -CH 2 -、-CH 2 -CF 2 -、-CHF-CHF-、-CH 2 O-、-OCH 2 -, -CF=CH-, -CH=CF-, -CF-, -CH=CH-, or-C≡C-, and no direct bond between heteroatoms directly bonded to C;
at least one H in the group is substituted by any one atom of F, cl, br, I.
3. The liquid crystal composition according to claim 1, further comprising at least one fifth compound having a structure represented by general formula (v):
wherein R is 5 R is R 6 Each independently selected from the group consisting of substituted or unsubstituted alkyl groups having 1 to 10 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 10 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyloxy groups having 2 to 10 carbon atoms, R 5 R is R 6 Is unsubstituted or at least one H is substituted by any one atom of F, cl, br, I.
4. A liquid crystal composition according to claim 3, wherein the mass fraction of the fifth compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the fifth compound in the liquid crystal composition is less than or equal to 15%.
5. The liquid crystal composition of claim 1, further comprising at least one sixth compound having a structure according to formula (VI):
wherein R is 7 R is R 8 Each independently selected from the group consisting of substituted or unsubstituted alkyl groups having 1 to 10 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 10 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyloxy groups having 2 to 10 carbon atoms, R 7 R is R 8 Is unsubstituted or at least one H is substituted by any one atom of F, cl, br, I.
6. The liquid crystal composition according to claim 5, wherein a mass fraction of the sixth compound in the liquid crystal composition is 1% or more, and a mass fraction of the sixth compound in the liquid crystal composition is 20% or less.
7. The liquid crystal composition according to claim 1, further comprising at least one seventh compound having a structure as shown in formula (VII):
wherein R is 9 R is R 10 Each independently selected from the group consisting of substituted or unsubstituted alkyl groups having 1 to 10 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 10 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyl groups having 2 to 10 carbon atoms, substituted or unsubstituted alkynyloxy groups having 2 to 10 carbon atoms, R 9 R is R 10 Is unsubstituted or at least one H is substituted by any one atom of F, cl, br, I.
8. The liquid crystal composition according to claim 7, wherein a mass fraction of the seventh compound in the liquid crystal composition is 1% or more, and a mass fraction of the seventh compound in the liquid crystal composition is 20% or less.
9. The liquid crystal composition according to any one of claims 1 to 8, wherein a mass fraction of the first compound in the liquid crystal composition is greater than or equal to 1%, and a mass fraction of the first compound in the liquid crystal composition is less than or equal to 25%;
The mass fraction of the second compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the second compound in the liquid crystal composition is less than or equal to 25%;
the mass fraction of the third compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the third compound in the liquid crystal composition is less than or equal to 25%;
the mass fraction of the fourth compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the fourth compound in the liquid crystal composition is less than or equal to 25%.
10. A display panel, comprising a first substrate, a second substrate positioned on the first substrate, and a liquid crystal layer positioned between the first substrate and the second substrate;
wherein the liquid crystal layer comprises the liquid crystal composition according to any one of claims 1 to 9.
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