CN115746870B - Liquid crystal composition and liquid crystal display panel - Google Patents
Liquid crystal composition and liquid crystal display panel Download PDFInfo
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- CN115746870B CN115746870B CN202211400119.9A CN202211400119A CN115746870B CN 115746870 B CN115746870 B CN 115746870B CN 202211400119 A CN202211400119 A CN 202211400119A CN 115746870 B CN115746870 B CN 115746870B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 156
- 239000000203 mixture Substances 0.000 title claims abstract description 82
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 45
- 150000001875 compounds Chemical class 0.000 claims abstract description 44
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 22
- 125000003342 alkenyl group Chemical group 0.000 claims abstract description 21
- 125000000304 alkynyl group Chemical group 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims description 18
- 239000000178 monomer Substances 0.000 claims description 16
- 230000007935 neutral effect Effects 0.000 claims description 9
- 125000003302 alkenyloxy group Chemical group 0.000 claims description 6
- 125000003545 alkoxy group Chemical group 0.000 claims description 6
- 125000005133 alkynyloxy group Chemical group 0.000 claims description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 6
- 125000005842 heteroatom Chemical group 0.000 claims description 5
- 125000004450 alkenylene group Chemical group 0.000 abstract description 3
- 125000002947 alkylene group Chemical group 0.000 abstract description 3
- 125000005529 alkyleneoxy group Chemical group 0.000 abstract description 3
- 125000004419 alkynylene group Chemical group 0.000 abstract description 3
- -1 prop-1-enyl Chemical group 0.000 description 38
- 238000005452 bending Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000002349 favourable effect Effects 0.000 description 5
- 125000001931 aliphatic group Chemical group 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 125000004975 3-butenyl group Chemical group C(CC=C)* 0.000 description 2
- 125000000474 3-butynyl group Chemical group [H]C#CC([H])([H])C([H])([H])* 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- SYSQUGFVNFXIIT-UHFFFAOYSA-N n-[4-(1,3-benzoxazol-2-yl)phenyl]-4-nitrobenzenesulfonamide Chemical class C1=CC([N+](=O)[O-])=CC=C1S(=O)(=O)NC1=CC=C(C=2OC3=CC=CC=C3N=2)C=C1 SYSQUGFVNFXIIT-UHFFFAOYSA-N 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 125000004973 1-butenyl group Chemical group C(=CCC)* 0.000 description 1
- 125000004972 1-butynyl group Chemical group [H]C([H])([H])C([H])([H])C#C* 0.000 description 1
- 125000004974 2-butenyl group Chemical group C(C=CC)* 0.000 description 1
- 125000000069 2-butynyl group Chemical group [H]C([H])([H])C#CC([H])([H])* 0.000 description 1
- HBAQYPYDRFILMT-UHFFFAOYSA-N 8-[3-(1-cyclopropylpyrazol-4-yl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-3-methyl-3,8-diazabicyclo[3.2.1]octan-2-one Chemical class C1(CC1)N1N=CC(=C1)C1=NNC2=C1N=C(N=C2)N1C2C(N(CC1CC2)C)=O HBAQYPYDRFILMT-UHFFFAOYSA-N 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- YCLAMANSVUJYPT-UHFFFAOYSA-L aluminum chloride hydroxide hydrate Chemical compound O.[OH-].[Al+3].[Cl-] YCLAMANSVUJYPT-UHFFFAOYSA-L 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 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 1
- 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 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- Liquid Crystal Substances (AREA)
Abstract
The invention provides a liquid crystal composition and a liquid crystal display panel, wherein the liquid crystal composition comprises one or more ofA compound represented by the formula; wherein X is-O-or-S-; a 1、A2 is, independently of one another, a single bond, -O-, -S-, or an alkylene or alkyleneoxy group having from 1 to 7 carbon atoms, or an alkenylene or alkenyleneoxy group having from 2 to 7 carbon atoms, or an alkynylene or alkynyleneoxy group having from 2 to 7 carbon atoms; w 1 and W 2 are each independently of the other R 1 and R 2 are each, independently of one another, H, F, cl, br, I, CN, SCN, NCS, SF 5 or alkyl having 1 to 15 carbon atoms or alkenyl or alkynyl having 2 to 15 carbon atoms.
Description
Technical Field
The application relates to the field of display, in particular to a liquid crystal composition and a liquid crystal display panel.
Background
With the development of display technology, flat display devices such as Liquid crystal display devices (Liquid CRYSTAL DISPLAY, LCD) have been widely used in various consumer electronic products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and have become the mainstream of display devices because of their advantages such as high image quality, power saving, thin body, and wide application range.
In order to meet the demands of various consumer electronics, liquid crystal materials for display elements and display devices such as IPS display mode, FFS display mode, and VA display mode are required to have a driving voltage of ①: the liquid crystal material has larger dielectric anisotropy; ② Fast response: the liquid crystal material has smaller viscosity and larger elastic coefficient; ③ high temperature resistance: the liquid crystal material has higher clearing point; ④ High contrast: the liquid crystal material has suitable optical anisotropy and dielectric negativity.
In order to show better display effect, the contrast ratio, response time and other performances of the existing liquid crystal display panel need to be further improved.
Disclosure of Invention
The invention provides a liquid crystal composition and a liquid crystal display panel, which are used for improving the performances of contrast ratio, response time and the like of the liquid crystal display panel.
In order to solve the problems, the technical scheme provided by the invention is as follows:
The invention provides a liquid crystal composition, which comprises one or more compounds represented by a formula I:
wherein X is-O-or-S-;
A 1、A2 is, independently of one another, a single bond, -O-, -S-, or an alkylene or alkyleneoxy group having from 1 to 7 carbon atoms, or an alkenylene or alkenyleneoxy group having from 2 to 7 carbon atoms, or an alkynylene or alkynyleneoxy group having from 2 to 7 carbon atoms;
w 1 and W 2 are each independently of the other H in the W 1 and the W 2 may be mono-substituted or poly-substituted with F, cl, br, I;
R 1 and R 2 are each, independently of one another, H, F, cl, br, I, CN, SCN, NCS, SF 5, or alkyl having 1 to 15 carbon atoms, or alkenyl or alkynyl having 2 to 15 carbon atoms; one or more CH 2 groups in the R 1, the R 2 may be -O-、-S-、-SO2-、-CO-、-C(O)O-、-OC(O)-、-OC(O)O-、-CF2O-、-OCF2-、-CH2CH2-、-CF2CF2-、-CF2CH2-、-CH2CF2-、-CHF-CHF-、-CH2O-、-OCH2-、-CF＝CH-、-CH＝CF-、-CF＝CF-、-CH＝CH- or-c≡c-substituted and the heteroatoms are not directly bonded, and one or more H in the R 1, the R 2 may be F, cl, br, I substituted.
Alternatively, in some embodiments of the invention, the a 1, the a 2 are, independently of each other, a single bond or-O-.
Alternatively, in some embodiments of the invention, the W 1 and the W 2 are, independently of each other
Alternatively, in some embodiments of the invention, the R 1 and the R 2 are each independently H, F, cl, br, or an alkyl group having 1-7 carbon atoms, or an alkenyl or alkynyl group having 2-7 carbon atoms.
Alternatively, in some embodiments of the present invention, the compound represented by formula I is selected from any one or more of the following sub-formulas I-1 to I-12; the formulae I-1 to I-12 are in particular:
Wherein R 1 and R 2 are each independently of the other alkyl having 1 to 15 carbon atoms or alkenyl or alkynyl having 2 to 15 carbon atoms, one or two CH 2 groups of said R 1 and said R 2 are replaced by-O-; -C (O) O-, -OC (O) -, -CF 2O-、-OCF2-、-CH2O-、-OCH2 -substitution and non-direct bonding of the heteroatoms.
Alternatively, in some embodiments of the present invention, the compound represented by formula I is selected from one or more of the following sub-formulae I-2-1 to I-12-12, and specifically formulas I-2-1 to I-12-12 are:
optionally, in some embodiments of the present invention, the liquid crystal composition further comprises a neutral monomer comprising any one or more of the compounds represented by formulas ii 1 to ii 9; the formulae II 1 to II 9 are in particular:
Wherein R 3 and R 4 are, independently of one another, alkyl or alkoxy having 1 to 10 carbon atoms, or alkenyl, alkenyloxy, alkynyl or alkynyloxy having 2 to 10 carbon atoms; the H atoms in the R 3 and the R 4 may be mono-or polysubstituted with F, cl, br, I.
Optionally, in some embodiments of the invention, the liquid crystal composition further comprises a polar monomer comprising any one or more of the compounds represented by formulas iii 1 to iii 5; the formulae III 1 to III 5 are in particular:
Wherein R 5 and R 6 are, independently of one another, alkyl or alkoxy having 1 to 10 carbon atoms, or alkenyl, alkenyloxy, alkynyl or alkynyloxy having 2 to 10 carbon atoms; the H atoms in the R 5 and the R 6 may be mono-or polysubstituted with F, cl, br, I.
Alternatively, in some embodiments of the present invention, the liquid crystal composition includes
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs respectively 18%, 11%, 5%, 12%, 8%, 6%, 7%, 13%; or alternatively
The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs 35%, 5%, 10%, 8%, 4%, 10%, 6%, 8%, 2%, respectively; or alternatively
The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs respectively 10%, 5%, 9% by weight 9%, 8%, 5%, 8%, 6%; or alternatively
The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs respectively 35%, 10%, 5%, 6%, 8%, 10%, 6% by mass; or alternatively
The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs 35%, 3%, 5%, 3%, 8%, 9%, 8%, 6%, 4%, 6%, 5%, 3%, respectively; or alternatively
The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe mass percentages of (a) are 30%, 8%, 13%, 5%, 8%, 6%, 10% and 4%, respectively.
Correspondingly, the invention also provides a liquid crystal display panel, which comprises a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate and the second substrate are oppositely arranged, the liquid crystal layer is arranged between the first substrate and the second substrate, and the liquid crystal layer comprises the liquid crystal composition according to any one embodiment of the invention.
The invention provides a liquid crystal composition and a liquid crystal display panel, wherein the liquid crystal composition comprisesOne or more compounds represented by, saidThe compound of (2) comprises a fluorodibenzofuran group or a fluorodibenzothiophene group, wherein the fluorodibenzofuran group or the fluorodibenzofuran group has larger dielectric negativity, larger polarity and lower viscosity, so that the liquid crystal composition has quicker corresponding time.
Drawings
The technical solution and other advantageous effects of the present application will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a liquid crystal display panel according to an embodiment of the invention.
Detailed Description
The following description of the present embodiments and/or examples will be provided for clarity and completeness of the description of the present embodiments and/or examples, and it is apparent that the embodiments and/or examples described below are merely some, but not all, embodiments and/or examples of the present invention. All other embodiments and/or examples, which a person of ordinary skill in the art would achieve without undue burden, are within the scope of the invention based on embodiments and/or examples in the present invention.
The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ left ], [ right ], [ front ], [ rear ], [ inner ], [ outer ], [ side ], etc., are only referring to the directions of the attached drawings. Accordingly, directional terminology is used to describe and understand the invention and is not intended to be limiting. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature.
The embodiment of the invention provides a liquid crystal composition and a liquid crystal display panel comprising the same, so as to improve the performances of the liquid crystal display panel, such as contrast ratio, response time and the like.
In one embodiment, the present invention provides a liquid crystal composition comprising one or more compounds represented by formula i:
wherein X is-O-or-S-.
A 1、A2 is, independently of one another, a single bond, -O-, -S-, or an alkylene or alkyleneoxy group having from 1 to 7 carbon atoms, or an alkenylene or alkenyleneoxy group having from 2 to 7 carbon atoms, or an alkynylene or alkynyleneoxy group having from 2 to 7 carbon atoms; preferably, said a 1, said a 2 are each independently a single bond or-O-; particularly preferably, both of said A 1 and said A 2 are-O-.
W 1 and W 2 are each independently of the other Preferably, the W 1 and the W 2 are, independently of each otherPreferably, the W 1 and the W 2 are, independently of each otherH in the W 1 and the W 2 may be mono-substituted or poly-substituted with F, cl, br, I.
R 1 and R 2 are each, independently of one another, H, F, cl, br, I, CN, SCN, NCS, SF 5, or alkyl having 1 to 15 carbon atoms, or alkenyl or alkynyl having 2 to 15 carbon atoms; preferably, said R 1 and said R 2 are each independently H, F, cl, br, or an alkyl group having 1 to 7 carbon atoms, or an alkenyl or alkynyl group having 2 to 7 carbon atoms. One or more CH 2 groups in the R 1, the R 2 may be -O-、-S-、-SO2-、-CO-、-C(O)O-、-OC(O)-、-OC(O)O-、-CF2O-、-OCF2-、-CH2CH2-、-CF2CF2-、-CF2CH2-、-CH2CF2-、-CHF-CHF-、-CH2O-、-OCH2-、-CF＝CH-、-CH＝CF-、-CF＝CF-、-CH＝CH- or-c≡c-substituted and the heteroatoms are not directly bonded, and one or more H in the R 1, the R 2 may be F, cl, br, I substituted.
In the case where A 1 is a single bond or-O-, the R 1 and R 2 are preferably alkyl groups having 1 to 7 carbon atoms, particularly preferably alkyl groups having 2 to 5 carbon atoms. In the case where A 2 is a single bond or-O-, R 2 is preferably alkyl, alkenyl or alkynyl, particularly preferably alkyl having 1 to 7 carbon atoms. The sum of the numbers of carbon atoms in the R 1 and the R 2 is preferably 4,5, 6, 7, 8, 9 or 10, particularly preferably 5, 6, 7, 8 or 9.
When R 1 and R 2 are each independently preferably an alkyl group, the alkyl group may have a linear structure or a branched structure, preferably a linear structure; the straight-chain structure is a straight-chain aliphatic hydrocarbon group, and the branched-chain structure is a branched-chain aliphatic hydrocarbon group. The R 1 and the R 2 are preferably, independently of one another, methyl, ethyl, propyl, butyl, pentyl, hexyl or heptyl.
When R 1 and R 2 are each independently preferably an alkenyl group or an alkynyl group, the alkenyl group or the alkynyl group may have a straight-chain structure or a branched-chain structure, and the alkenyl group, the alkynyl group have at least one carbon-carbon double bond or carbon-carbon triple bond; the straight-chain structure is a straight-chain aliphatic hydrocarbon group, and the branched-chain structure is a branched-chain aliphatic hydrocarbon group. Preferably, said R 1 and said R 2 are straight-chain alkenyl or alkynyl groups having 2 to 7 carbon atoms; it is particularly preferred that R 1 and R 2 are, independently of one another, 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, ethynyl, prop-1-ynyl, prop-2-ynyl, but-1-ynyl, but-2-ynyl, but-3-ynyl, pent-2-ynyl, pent-3-ynyl, pent-4-ynyl, hex-1-ynyl, hex-2-ynyl, hex-3-ynyl, hex-4-ynyl, hex-5-alkynyl, hept-1-alkynyl, hept-2-alkynyl, hept-3-ynyl, hept-4-ynyl, hept-6-ynyl, and the E-5-and Z-form may be the isomers and the E-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.
In one embodiment, the compound represented by formula I is selected from any one or more of the sub-formulae I-1 to I-12; the formulae I-1 to I-12 are in particular:
Wherein R 1 and R 2 are each independently of the other alkyl having 1 to 15 carbon atoms or alkenyl or alkynyl having 2 to 15 carbon atoms, one or two CH 2 groups in said R 1, said R 2 are substituted with-O-, -C (O) O-, -OC (O) -, -CF 2O-、-OCF2-、-CH2O-、-OCH2 -, and the heteroatoms are not directly bonded; the alkyl group is preferably a straight chain compound having 1 to 7 carbon atoms.
Preferably, the compound represented by formula I is selected from one or more of the following sub-formulae I-2-1 to I-12-12, and the formula I-2-1 to I-12-12 is specifically:
In an embodiment of the present invention, the compound represented by formula i is optically active and has a chiral center. The compounds of the formula I can exist in the form of isomers, such as pure enantiomers, diastereomers, E isomers, Z isomers or as mixtures of a plurality of isomers in any desired ratio, for example as racemates, E/Z isomer mixtures.
In one embodiment, when the compound represented by formula I includesWhen in use, theThe method is synthesized by the following synthesis paths:
in one embodiment, when the compound represented by formula I includes When in use, theThe method is synthesized by the following synthesis paths:
the other compounds represented by the formula I can be synthesized by referring to the two examples and the conventional methods in the art, and are not described herein.
In one embodiment, the liquid crystal composition further comprises a neutral monomer comprising any one or more of the compounds represented by formulas ii 1 to ii 9; the formulae II 1 to II 9 are in particular:
Wherein R 3 and R 4 are, independently of one another, alkyl or alkoxy having 1 to 10 carbon atoms, or alkenyl, alkenyloxy, alkynyl or alkynyloxy having 2 to 10 carbon atoms; the H atoms in the R 3 and the R 4 may be mono-or polysubstituted with F, cl, br, I.
In one embodiment, the liquid crystal composition further includes a polar monomer including any one or more of the compounds represented by formulas iii 1 to iii 5; the formulae III 1 to III 5 are in particular:
Wherein R 5 and R 6 are, independently of one another, alkyl or alkoxy having 1 to 10 carbon atoms, or alkenyl, alkenyloxy, alkynyl or alkynyloxy having 2 to 10 carbon atoms; the H atoms in the R 5 and the R 6 may be mono-or polysubstituted with F, cl, br, I.
In one embodiment, the formula I includes from 1% to 50%, from 1% to 90%, and from 1% to 90%, by weight, of the compound, the neutral monomer, and the polar monomer, respectively. Preferably, the formula I comprises 1% to 40%, 5% to 70% and 5% to 70% by weight of the compound, the neutral monomer and the polar monomer, respectively. More preferably, the formula I includes 1% -25%, 10% -50% and 10% -50% by weight of the compound, the neutral monomer and the polar monomer, respectively.
The liquid crystal composition according to the present invention will be explained in detail with reference to specific examples.
Example 1
TABLE 1
Referring to table 1, table 1 shows the ratios of the compounds of the respective components of the liquid crystal composition and the performance parameters of the liquid crystal composition provided in this example. The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs 18%, 11%, 5%, 12%, 8%, 6%, 7%, 13% by weight, respectively.
Response time of liquid crystalWherein γ1 is the rotational viscosity of the liquid crystal material, d is the thickness of the liquid crystal cell, Δε is the dielectric anisotropy of the liquid crystal, V th is the threshold voltage, K11 is the splay elastic coefficient, K22 is the twist elastic coefficient, and K33 is the bend elastic coefficient. From the above formula, the response time of the liquid crystal is positively correlated with the rotational viscosity γ1, and negatively correlated with the dielectric anisotropy Δε, the splay elastic modulus K11, and the bend elastic modulus K33. The liquid crystal composition provided in this example had a rotational viscosity γ1 of 93 mPas, a dielectric anisotropy Δεof-3.6, a splay elastic modulus K11 of 14.5 and a bend elastic modulus K33 of 15.2. The liquid crystal composition provided by the application has a larger negative dielectric constant delta epsilon, a smaller rotational viscosity gamma 1, a larger splay elastic coefficient K11 and a larger bending elastic coefficient K33, so that the liquid crystal composition has a quicker response time and is beneficial to improving the response speed of a liquid crystal display panel.
The contrast of liquid crystals is related to the dielectric anisotropy of the liquid crystals, and negative dielectric anisotropy helps to improve the contrast of the liquid crystals. The compound represented by the formula I has larger negative polarity, and the liquid crystal composition has larger negative dielectric constant delta epsilon by adding the compound represented by the formula I into the liquid crystal composition, so that the contrast ratio of the liquid crystal display panel is improved.
In addition, the liquid crystal composition provided in this example has a higher clearing point Tni (97 ℃) and thus a wider operating temperature range and a higher maximum operating temperature. The liquid crystal composition has a large negative dielectric constant delta epsilon (-3.6) at 25 ℃ and a low driving voltage.
In the liquid crystal composition provided by the embodiment, the compound represented by the formula I has larger dielectric negativity and lower rotational viscosity, and the addition of the compound is beneficial to shortening the response time of liquid crystal and improving the contrast ratio of the liquid crystal composition; the compounds of formula II have dielectric neutral, low viscosity properties, and their addition also helps to shorten the response time of the liquid crystal; the compound represented by the formula III has dielectric negativity, high Tni characteristics and the like; the compounds represented by the formula I, the formula II and the formula III in the liquid crystal composition can be appropriately adjusted according to actual needs so as to adjust various properties of the liquid crystal composition.
In summary, the liquid crystal composition provided in the embodiment has a larger dielectric negativity, a smaller rotational viscosity, a larger splay elastic coefficient, a larger bending elastic coefficient, a larger vertical dielectric constant and a higher clear point, which is beneficial to improving the response speed and contrast of the liquid crystal display panel, reducing the driving voltage of the liquid crystal display panel, expanding the working temperature range of the liquid crystal display panel, and improving the highest working temperature of the liquid crystal display panel.
The preparation method of the liquid crystal composition comprises the following steps:
Step B1, weighing the preset weight according to 18%, 11%, 5%, 12%, 8%, 6%, 7% and 13% by weight respectively The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe said
Step B2, sequentially adding the compounds in a melting container from low melting point to high melting point, and heating and stirring at 60-100 ℃ to enable the liquid crystal composition to be fully dissolved and mixed;
And B3, cooling the liquid crystal composition to room temperature.
Example two
TABLE 2
Referring to table 2, table 2 shows the ratios of the compounds of the respective components of the liquid crystal composition and the performance parameters of the liquid crystal composition provided in this example. The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs 35%, 5%, 10%, 8%, 4%, 10%, 6%, 8%, 2% by weight, respectively.
Similarly, the liquid crystal composition provided by the embodiment has larger dielectric negativity, smaller rotational viscosity, larger splay elastic coefficient, larger bending elastic coefficient, larger vertical dielectric constant and higher clear point, is favorable for improving the response speed and contrast of the liquid crystal display panel, and simultaneously reduces the driving voltage of the liquid crystal display panel, expands the working temperature range of the liquid crystal display panel and improves the highest working temperature of the liquid crystal display panel.
Example III
TABLE 3 Table 3
Referring to table 3, table 3 shows the ratios of the compounds of the respective components of the liquid crystal composition and the performance parameters of the liquid crystal composition provided in this example. The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs respectively 10%, 5%, 9% by weight 9%, 8%, 5%, 8%, 6%.
Similarly, the liquid crystal composition provided by the embodiment has larger dielectric negativity, smaller rotational viscosity, larger splay elastic coefficient, larger bending elastic coefficient, larger vertical dielectric constant and higher clear point, is favorable for improving the response speed and contrast of the liquid crystal display panel, and simultaneously reduces the driving voltage of the liquid crystal display panel, expands the working temperature range of the liquid crystal display panel and improves the highest working temperature of the liquid crystal display panel.
Example IV
TABLE 4 Table 4
Referring to table 4, table 4 shows the ratios of the compounds of the respective components of the liquid crystal composition and the performance parameters of the liquid crystal composition provided in this example. The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe mass percentages of (a) are 35%, 10%, 5%, 6%, 8%, 10%, 6% and 6%, respectively.
Similarly, the liquid crystal composition provided by the embodiment has larger dielectric negativity, smaller rotational viscosity, larger splay elastic coefficient, larger bending elastic coefficient, larger vertical dielectric constant and higher clear point, is favorable for improving the response speed and contrast of the liquid crystal display panel, and simultaneously reduces the driving voltage of the liquid crystal display panel, expands the working temperature range of the liquid crystal display panel and improves the highest working temperature of the liquid crystal display panel.
Example five
TABLE 5
Referring to table 5, table 5 shows the ratios of the compounds of the respective components of the liquid crystal composition and the performance parameters of the liquid crystal composition provided in this example. The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs 35%, 3%, 5%, 3%, 8%, 9%, 8%, 6%, 4%, 6%, 5%, 3% by weight, respectively.
Similarly, the liquid crystal composition provided by the embodiment has larger dielectric negativity, smaller rotational viscosity, larger splay elastic coefficient, larger bending elastic coefficient, larger vertical dielectric constant and higher clear point, is favorable for improving the response speed and contrast of the liquid crystal display panel, and simultaneously reduces the driving voltage of the liquid crystal display panel, expands the working temperature range of the liquid crystal display panel and improves the highest working temperature of the liquid crystal display panel.
Example six
TABLE 6
Referring to table 6, table 6 shows the ratios of the compounds of the respective components of the liquid crystal composition and the performance parameters of the liquid crystal composition provided in this example. The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe mass percentages of (a) are 30%, 8%, 13%, 5%, 8%, 6%, 10% and 4%, respectively.
Similarly, the liquid crystal composition provided by the embodiment has larger dielectric negativity, smaller rotational viscosity, larger splay elastic coefficient, larger bending elastic coefficient, larger vertical dielectric constant and higher clear point, is favorable for improving the response speed and contrast of the liquid crystal display panel, and simultaneously reduces the driving voltage of the liquid crystal display panel, expands the working temperature range of the liquid crystal display panel and improves the highest working temperature of the liquid crystal display panel.
Referring to fig. 1, the present invention further provides a liquid crystal display panel, which includes a first substrate 11, a second substrate 12, and a liquid crystal layer 13, wherein the first substrate 11 and the second substrate 12 are disposed opposite to each other, the liquid crystal layer 13 is disposed between the first substrate 11 and the second substrate 12, and the liquid crystal layer 13 includes the liquid crystal composition according to any one of the embodiments of the present invention. The liquid crystal display panel includes the liquid crystal composition according to any one of the embodiments of the present invention, so that the liquid crystal composition according to any one of the embodiments of the present invention has technical features and advantages, and detailed descriptions thereof are omitted herein with reference to the above embodiments. The Liquid Crystal display panel provided by the embodiment of the invention can be any one of a vertical alignment (VERTICAL ALIGNMENT, VA) Liquid Crystal display panel, a birefringence control (ELECTRICALLY CONTROLLED BIREFRINGENCE, ECB) Liquid Crystal display panel, a plasma addressing Liquid Crystal display panel (PLASMA ADDRESSED Liquid Crystal, PALC), a fringe field switching (FRINGE FIELD SWITCHING, FFS) Liquid Crystal display panel, a planar switching (In-PLANE SWITCHING, IPS) Liquid Crystal display panel and the like.
In summary, an embodiment of the present invention provides a liquid crystal composition and a liquid crystal display panel, the liquid crystal composition includesOne or more compounds represented by, saidThe compound of (2) comprises a fluorodibenzofuran group or a fluorodibenzothiophene group, wherein the fluorodibenzofuran group or the fluorodibenzofuran group has larger dielectric negativity, larger polarity and lower viscosity, so that the liquid crystal composition has quicker corresponding time.
The liquid crystal composition and the liquid crystal display panel provided by the embodiment of the invention are described in detail, and specific examples are applied to the description of the principle and the implementation mode of the invention, and the description of the above examples is only used for helping to understand the method and the core idea of the 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 (5)
1. A liquid crystal composition comprising one or more compounds represented by formula i, one or more neutral monomers, and one or more polar monomers:
The compound represented by the formula I is selected from any one or more of the formulas I-1 to I-12:
Wherein R 1 and R 2 are independently H, F, cl, br, I, CN, SCN, NCS, SF 5, alkyl having 1 to 15 carbon atoms, or alkenyl or alkynyl having 2 to 15 carbon atoms; one or more CH 2 groups in the R 1, the R 2 may be -O-、-S-、-SO2-、-CO-、-C(O)O-、-OC(O)-、-OC(O)O-、-CF2O-、-OCF2-、-CH2CH2-、-CF2CF2-、-CF2CH2-、-CH2CF2-、-CHF-CHF-、-CH2O-、-OCH2-、-CF＝CH-、-CH＝CF-、-CF＝CF-、-CH＝CH- or-c≡c-substituted and the heteroatoms are not directly bonded, one or more H in the R 1, the R 2 may be F, cl, br, I substituted;
the neutral monomer comprises any one or more of compounds represented by formulas II 1 to II 9:
Wherein R 3 and R 4 are independently alkyl or alkoxy having 1 to 10 carbon atoms, or alkenyl, alkenyloxy, alkynyl or alkynyloxy having 2 to 10 carbon atoms; the H atoms in the R 3 and the R 4 may be mono-or polysubstituted with F, cl, br, I;
The polar monomer includes any one or more of compounds represented by formulas III 1 to III 5:
Wherein R 5 and R 6 are independently alkyl or alkoxy having 1 to 10 carbon atoms, or alkenyl, alkenyloxy, alkynyl or alkynyloxy having 2 to 10 carbon atoms; the H atoms in the R 5 and the R 6 may be mono-or polysubstituted with F, cl, br, I;
the weight percentages of the compound represented by the formula I, the neutral monomer and the polar monomer are respectively 1% -40%, 5% -70% and 5% -70%.
2. The liquid crystal composition of claim 1, wherein R 1 and R 2 are independently H, F, cl, br, alkyl having 1 to 7 carbon atoms, or alkenyl or alkynyl having 2 to 7 carbon atoms.
3. The liquid crystal composition according to claim 1, wherein the compound represented by formula I is selected from one or more of the following formulas I-2-1 to I-12-12, and specifically formulas I-2-1 to I-12-12 are:
4. The liquid crystal composition of claim 1, wherein the liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs respectively 18%, 11%, 5%, 12%, 8%, 6%, 7%, 13%; or alternatively
The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs 35%, 5%, 10%, 8%, 4%, 10%, 6%, 8%, 2%, respectively; or alternatively
The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs respectively 10%, 5%, 9% by weight 9%, 8%, 5%, 8%, 6%; or alternatively
The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs respectively 35%, 10%, 5%, 6%, 8%, 10%, 6% by mass; or alternatively
The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidIs 35%, 3%, 5%, 3%, 8%, 9%, 8%, 6%, 4%, 6%, 5%, 3%, respectively; or alternatively
The liquid crystal composition comprises
The saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe saidThe mass percentages of (a) are 30%, 8%, 13%, 5%, 8%, 6%, 10% and 4%, respectively.
5. A liquid crystal display panel comprising a first substrate, a second substrate, and a liquid crystal layer, wherein the first substrate and the second substrate are disposed opposite to each other, the liquid crystal layer is disposed between the first substrate and the second substrate, and the liquid crystal layer comprises the liquid crystal composition according to any one of claims 1 to 4.
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