CN109913239B - Positive and negative mixed liquid crystal composition and application thereof - Google Patents
Positive and negative mixed liquid crystal composition and application thereof Download PDFInfo
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- CN109913239B CN109913239B CN201711321577.2A CN201711321577A CN109913239B CN 109913239 B CN109913239 B CN 109913239B CN 201711321577 A CN201711321577 A CN 201711321577A CN 109913239 B CN109913239 B CN 109913239B
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Abstract
The invention relates to a positive and negative mixed liquid crystal composition and application thereof. The provided liquid crystal composition has large vertical dielectric, further has a lower ratio of parallel dielectric to vertical dielectric, and further has higher transmittance. Therefore, the liquid crystal composition provided by the invention is suitable for IPS or FFS type TFT liquid crystal display devices, can obviously improve the transmittance of a liquid crystal display and reduce the energy loss of a backlight source, and is particularly suitable for FFS type liquid crystal displays.
Description
Technical Field
The invention relates to a liquid crystal composition, in particular to a liquid crystal composition which can obviously improve the transmittance of a liquid crystal display when being used in the liquid crystal display.
Background
At present, the technology of LCD products has matured, and the technical problems of viewing angle, resolution, color saturation and brightness, etc. are successfully solved, and the display performance of the LCD products is close to or exceeds that of CRT displays. Large-sized and medium-sized LCDs have gradually occupied the mainstream position of flat panel displays in their respective fields. The liquid crystal belongs to passive luminous display, that is to say, the liquid crystal panel plays the effect of photoswitch, and the transmittance is about 6% behind the light passing through the liquid crystal panel, in order to promote luminance, need strengthen backlight luminance, and then need consume more electric energy and be used for promoting backlight luminance, and this energy consumption that has promoted backlight has greatly, and liquid crystal display's energy consumption is used for the backlight more than 95%, and it is very effective to reducing liquid crystal display's energy consumption to promote liquid crystal display's transmittance. With the increasing emphasis on energy consumption and environmental protection, the problem of reducing the energy consumption of the liquid crystal display is more concerned. Therefore, the improvement of the transmittance of the liquid crystal panel becomes the focus of the current liquid crystal display.
Specifically, epsilon of the liquid crystal composition is reduced for IPS (in-plane switching) and FFS (fringe field effect) mode displays‖|ε⊥(ratio of parallel dielectric to perpendicular dielectric) is effective in enhancing the transmittance of the liquid crystal display. The liquid crystal composition provided by the invention effectively reduces epsilon of the liquid crystal composition‖|ε⊥The effect of improving the transmittance is achieved.
Disclosure of Invention
The liquid crystal composition provided by the invention effectively reduces epsilon of the liquid crystal composition‖|ε⊥(the ratio of parallel dielectric to perpendicular dielectric) has good effect of increasing transmittance. In particular, the liquid crystal composition provided by the invention has large vertical dielectric and further has high transmittance.
Specifically, the present invention provides a liquid crystal composition comprising at least one compound represented by the general formula I:
wherein R is1Independently represent C1～C12Wherein one or more non-adjacent CH2May each be independently substituted with O, S or CH ═ CH; x1Each independently represent F, CF3、OCF3；
And at least one compound represented by the general formula II:
wherein R is2、R3Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); a. the1Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene.
And at least one compound represented by the general formula III:
wherein R is4、R5Independently represent C1～C12Wherein one or more non-adjacent CH2May each be independently substituted with O, S or CH ═ CH; a. the2、A3Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene.
The compound represented by the general formula I has large optical anisotropy and large dielectric anisotropy.
Specifically, the compounds represented by formula I are selected from one or more of formulas IA through IC:
wherein R is1Each independently represents C1～C7The linear alkyl group of (1);
preferably, the compound represented by the general formula I is selected from one or more of IA 1-IC 5:
more preferably, the compound represented by the general formula I is selected from one or more of IA2, IA3, IA5, IC2 and IC 3; one or both of IA2 and IA3 are particularly preferred.
The structure represented by the general formula II provided by the invention is a liquid crystal compound containing a2, 3-difluorobenzene structure, the structure has large vertical dielectric, and can effectively improve the vertical dielectric of a liquid crystal composition, and specifically, the compound represented by the general formula II is selected from one or more of IIA-IIB:
wherein R is2Represents C1～C7Straight chain alkyl or C2～C7A linear alkenyl group of (a); r3Represents C1～C7Linear alkyl or linear alkoxy groups of (1).
Preferably, the compound represented by the general formula II is selected from one or more of IIA 1-IIB 36:
more preferably, the compound represented by the general formula II is selected from one or more of IIA1, IIA2, IIA14, IIA19, IIA20, IIA21, IIA22, IIA26, IIB19, IIB20 and IIB 32; particularly preferably one or more of IIA19, IIA20, IIA21, IIB19 and IIB 20.
The compound represented by the general formula III provided by the invention has very low rotational viscosity, and specifically, the compound represented by the general formula III is selected from one or more of IIIA-IIIC:
wherein R is4Each independently represents C1～C7The linear alkyl group of (1); r5Each independently represents C1～C7Linear alkyl, linear alkoxy or C2～C7Linear alkenyl groups of (a).
Preferably, the compound represented by formula III is selected from one or more of formulae IIIA1 to IIIC 38:
more preferably, the compound represented by the general formula III is selected from one or more of formulae IIIA2, IIIA4, IIIA6, IIIA8, IIIA14, IIIA22, IIIA26, IIIA27, IIIB14, IIIB18, IIIB22, IIIC2, IIIC4, IIIC6, IIIC22, IIIC26, IIIC29, IIIC 30; particularly preferably one or more of IIIA2, IIIA6, IIIA14, IIIB22, IIIC4, IIIC29 and IIIC 30.
The liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula IV:
wherein R is6、R7Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); a. the4Each independently represents trans-1, 4-cyclohexyl, 1, 4-phenylene in which one or more H atoms on the phenyl ring may be substituted by F.
The compound represented by the general formula IV provided by the invention is a tricyclic neutral monomer, and specifically, the compound represented by the general formula IV is selected from one or more of IVA to IVC:
in the formulae IVA to IVC: r6Independently represent C2～C7Straight chain alkyl or C2～C7A linear alkenyl group; r7Independently represent C1～C8Linear alkyl group of (1).
Further preferably, the compound represented by the general formula IV is selected from one or more compounds represented by general formulas IVA 1-IVA 18, IVB 1-IVB 22:
more preferably, the compounds of formula IV provided by the present invention are selected from one or more of formulae IVA1, IVA2, IVA8, IVA12, IVA16, IVB5, IVB12, IVB16, IVB 18; particular preference is given to one or more of the formulae IVA1, IVA2, IVA8, IVB12, IVB 16.
The liquid crystal composition provided by the invention can also comprise one or more compounds contained in the general formula V:
wherein R is8Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); a. the5Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene in which one or more H atoms on the phenyl ring may be substituted by F atoms.
Specifically, the compound represented by the general formula V is selected from one or more of VA to VC:
wherein R is8Each independently represents C1～C7Linear alkyl, linear alkoxy or C2～C7A linear alkenyl group of (a); more preferably C2～C5Linear alkyl or linear alkenyl of (1).
The liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula VI:
wherein R is9Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); l is1、L2Each independently represents F or H; x2Each independently represents F or OCF3；A6Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene in which one or more H atoms on the phenyl ring may be substituted by F atoms.
Specifically, the compound represented by formula VI is selected from one or more of VIA to VIH:
wherein R is9Each independently represents C1～C7The linear alkyl group of (1); preferably C2～C5Linear alkyl group of (1).
The liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula VII:
wherein R is10、R11Each independently represents C1～C12Straight chain alkyl or C2～C12A linear alkenyl group of (a); l is3Each independently represents H or F.
The compound represented by the general formula VII has large optical anisotropy and high clearing point; specifically, the compound represented by the general formula VII is selected from one or more of VIIA and VIIB.
Wherein R is10、R11Each independently represents C1～C7The linear alkyl group of (1); preferably C2～C5Linear alkyl group of (1).
The liquid crystal composition provided by the invention can also comprise one or more compounds represented by the general formula VIII:
wherein R is12Each independently represents C1～C12Straight chain alkyl or C2～C12A linear alkenyl group of (a); r13Each independently represent F, C1～C12Straight chain alkyl or C2～C12A linear alkenyl group of (a);
the compound represented by the general formula VIII has large optical anisotropy, and specifically, the compound represented by the general formula VIII is selected from one or more of VIIIA to VIIIE:
wherein R is12、R13Each independently represents C1～C7The linear alkyl group of (1); preferably C1～C5Linear alkyl group of (1).
The liquid crystal composition provided by the present invention may further comprise one or more compounds represented by formula IX:
wherein R is14Each independently represents C1～C12The linear alkyl group of (1); n is 0 or 1; l is4Each independently represents H or CH3；A7、A8、A9Each independently represents:
the compound represented by the formula IX has a large dielectric anisotropy, and specifically, the compound of the formula IX is selected from one or more of IXA to IXH:
wherein R is14Each independently represents C1～C7The linear alkyl group of (1); preferably C2～C5Linear alkyl group of (1).
Specifically, the liquid crystal composition of the present invention preferably comprises the following components by weight:
(1) 1-30% of a compound represented by general formula I;
(2) 1-40% of a compound represented by general formula II;
(3)20 to 70% of a compound represented by the general formula III;
(4)0 to 30% of a compound represented by the general formula IV;
(5)0 to 20% of a compound represented by the general formula V;
(6)0 to 20% of a compound represented by the general formula VI;
(7)0 to 20% of a compound represented by the general formula VII;
(8)0 to 20% of a compound represented by the general formula VIII;
(9)0 to 35% of a compound represented by the general formula IX.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 2-25% of a compound represented by general formula I;
(2) 3-34% of a compound represented by general formula II;
(3) 40-65% of a compound represented by the general formula III;
(4)0 to 20% of a compound represented by the general formula IV;
(5)0 to 10% of a compound represented by the general formula V;
(6)0 to 12% of a compound represented by the general formula VI;
(7)0 to 10% of a compound represented by the general formula VII;
(8)0 to 15% of a compound represented by general formula VIII;
(9)0 to 30% of a compound represented by the general formula IX.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 3-21% of a compound represented by general formula I;
(2) 5-27% of a compound represented by general formula II;
(3) 46-59% of a compound represented by the general formula III;
(4)0 to 14% of a compound represented by the general formula IV;
(5)0 to 5% of a compound represented by the general formula V;
(6)0 to 6% of a compound represented by the general formula VI;
(7)0 to 5% of a compound represented by the general formula VII;
(8)0 to 11% of a compound represented by the general formula VIII;
(9)0 to 24% of a compound represented by the general formula IX.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 14-25% of a compound represented by general formula I;
(2) 10-30% of a compound represented by general formula II;
(3) 45-60% of a compound represented by general formula III;
(4)0 to 15% of a compound represented by the general formula IV;
(5)0 to 8% of a compound represented by the general formula V;
(6)0 to 9% of a compound represented by the general formula VI;
(7)0 to 7% of a compound represented by the general formula VII;
(8)0 to 15% of a compound represented by general formula VIII;
(9)0 to 15% of a compound represented by the general formula IX.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 14-21% of a compound represented by general formula I;
(2) 12-27% of a compound represented by general formula II;
(3) 48-56% of a compound represented by the general formula III;
(4)0 to 9% of a compound represented by the general formula IV;
(5)0 to 5% of a compound represented by the general formula V;
(6)0 to 5% of a compound represented by the general formula VI;
(7)0 to 4% of a compound represented by the general formula VII;
(8)0 to 10% of a compound represented by the general formula VIII;
(9)0 to 9% of a compound represented by the general formula IX.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 2-16% of a compound represented by general formula I;
(2) 3-30% of a compound represented by general formula II;
(3) 40-65% of a compound represented by the general formula III;
(4)0 to 18% of a compound represented by the general formula IV;
(5)0 to 8% of a compound represented by the general formula V;
(6)0 to 9% of a compound represented by the general formula VI;
(7)0 to 8% of a compound represented by the general formula VII;
(8)0 to 15% of a compound represented by general formula VIII;
(9)0 to 30% of a compound represented by the general formula IX.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 3-16% of a compound represented by general formula I;
(2) 5-27% of a compound represented by general formula II;
(3) 46-59% of a compound represented by the general formula III;
(4)0 to 14% of a compound represented by the general formula IV;
(5)0 to 5% of a compound represented by the general formula V;
(6)0 to 6% of a compound represented by the general formula VI;
(7)0 to 5% of a compound represented by the general formula VII;
(8)0 to 11% of a compound represented by the general formula VIII;
(9)0 to 24% of a compound represented by the general formula IX.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 2-25% of a compound represented by general formula I;
(2) 14-30% of a compound represented by general formula II;
(3) 48-63% of a compound represented by formula III;
(4)0 to 15% of a compound represented by the general formula IV;
(5)0 to 8% of a compound represented by the general formula V;
(6)0 to 8% of a compound represented by the general formula VI;
(7)0 to 8% of a compound represented by the general formula VII;
(8)0 to 10% of a compound represented by the general formula VIII;
(9)0 to 12% of a compound represented by the general formula IX.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 3-21% of a compound represented by general formula I;
(2) 14-27% of a compound represented by general formula II;
(3) 52-58% of a compound represented by the general formula III;
(4)0 to 9% of a compound represented by the general formula IV;
(5)0 to 5% of a compound represented by the general formula V;
(6)0 to 5% of a compound represented by the general formula VI;
(7)0 to 4% of a compound represented by the general formula VII;
(8)0 to 5% of a compound represented by the general formula VIII;
(9)0 to 7% of a compound represented by the general formula IX.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 2-17% of a compound represented by general formula I;
(2) 3-20% of a compound represented by general formula II;
(3) 40-64% of a compound represented by the general formula III;
(4)0 to 18% of a compound represented by the general formula IV;
(5)0 to 8% of a compound represented by the general formula V;
(6)0 to 9% of a compound represented by the general formula VI;
(7)0 to 10% of a compound represented by the general formula VII;
(8)0 to 15% of a compound represented by general formula VIII;
(9)0 to 29% of a compound represented by the general formula IX.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 3-17% of a compound represented by general formula I;
(2) 5-15% of a compound represented by general formula II;
(3) 46-59% of a compound represented by the general formula III;
(4)0 to 14% of a compound represented by the general formula IV;
(5)0 to 5% of a compound represented by the general formula V;
(6)0 to 6% of a compound represented by the general formula VI;
(7)0 to 5% of a compound represented by the general formula VII;
(8)0 to 11% of a compound represented by the general formula VIII;
(9)0 to 24% of a compound represented by the general formula IX.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 2-20% of a compound represented by general formula I;
(2) 3-30% of a compound represented by general formula II;
(3) 40-65% of a compound represented by the general formula III;
(4) 1-18% of a compound represented by formula IV;
(5)0 to 8% of a compound represented by the general formula V;
(6)0 to 9% of a compound represented by the general formula VI;
(7)0 to 8% of a compound represented by the general formula VII;
(8)0 to 15% of a compound represented by general formula VIII;
(9)0 to 29% of a compound represented by the general formula IX.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 3-16% of a compound represented by general formula I;
(2) 5-25% of a compound represented by general formula II;
(3) 46-59% of a compound represented by the general formula III;
(4)1 to 14% of a compound represented by the general formula IV;
(5)0 to 5% of a compound represented by the general formula V;
(6)0 to 6% of a compound represented by the general formula VI;
(7)0 to 5% of a compound represented by the general formula VII;
(8)0 to 11% of a compound represented by the general formula VIII;
(9)0 to 24% of a compound represented by the general formula IX.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 13-25% of a compound represented by formula I;
(2) 8-30% of a compound represented by general formula II;
(3) 43-60% of a compound represented by the general formula III;
(4)0 to 8% of a compound represented by the general formula V;
(5)0 to 8% of a compound represented by the general formula VI;
(6)0 to 9% of a compound represented by the general formula VII;
(7)0 to 15% of a compound represented by general formula VIII;
(8)0 to 15% of a compound represented by the general formula IX.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 16-21% of a compound represented by general formula I;
(2) 12-27% of a compound represented by general formula II;
(3) 48-55% of a compound represented by the general formula III;
(4)0 to 5% of a compound represented by the general formula V;
(5)0 to 5% of a compound represented by the general formula VI;
(6)0 to 4% of a compound represented by the general formula VII;
(7)0 to 10% of a compound represented by the general formula VIII;
(8)0 to 9% of a compound represented by the general formula IX.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 2-20% of a compound represented by general formula I;
(2) 10-32% of a compound represented by general formula II;
(3) 45-63% of a compound represented by general formula III;
(4)0 to 15% of a compound represented by the general formula IV;
(5) 1-10% of a compound represented by formula V;
(6)0 to 8% of a compound represented by the general formula VII;
(7)0 to 10% of a compound represented by the general formula VIII;
(8)0 to 12% of a compound represented by the general formula IX.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 3-16% of a compound represented by general formula I;
(2) 14-27% of a compound represented by general formula II;
(3) 52-58% of a compound represented by the general formula III;
(4)0 to 9% of a compound represented by the general formula IV;
(5) 3-5% of a compound represented by formula V;
(6)0 to 4% of a compound represented by the general formula VII;
(7)0 to 5% of a compound represented by the general formula VIII;
(8)0 to 7% of a compound represented by the general formula IX.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 2-25% of a compound represented by general formula I;
(2) 3-32% of a compound represented by general formula II;
(3) 40-63% of a compound represented by the general formula III;
(4)0 to 19% of a compound represented by the general formula IV;
(5)0 to 10% of a compound represented by the general formula VI;
(6)0 to 8% of a compound represented by the general formula VII;
(7)0 to 15% of a compound represented by general formula VIII;
(8)0 to 30% of a compound represented by the general formula IX.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 4-21% of a compound represented by general formula I;
(2) 5-27% of a compound represented by general formula II;
(3) 46-59% of a compound represented by the general formula III;
(4)0 to 14% of a compound represented by the general formula IV;
(5)0 to 6% of a compound represented by the general formula VI;
(6)0 to 5% of a compound represented by the general formula VII;
(7)0 to 11% of a compound represented by the general formula VIII;
(8)0 to 24% of a compound represented by the general formula IX.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 3-25% of a compound represented by general formula I;
(2) 5-32% of a compound represented by general formula II;
(3) 48-64% of a compound represented by the general formula III;
(4)0 to 15% of a compound represented by the general formula IV;
(5)0 to 10% of a compound represented by the general formula V;
(6)0 to 10% of a compound represented by the general formula VI;
(7)0 to 8% of a compound represented by the general formula VII;
(8)0 to 15% of a compound represented by the general formula VIII.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 5-21% of a compound represented by general formula I;
(2) 9-27% of a compound represented by general formula II;
(3) 52-59% of a compound represented by the general formula III;
(4)0 to 10% of a compound represented by the general formula IV;
(5)0 to 5% of a compound represented by the general formula V;
(6)0 to 6% of a compound represented by the general formula VI;
(7)0 to 4% of a compound represented by the general formula VII;
(8)0 to 11% of a compound represented by the general formula VIII.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 2-22% of a compound represented by general formula I;
(2) 3-31% of a compound represented by general formula II;
(3) 40-63% of a compound represented by the general formula III;
(4)0 to 19% of a compound represented by the general formula IV;
(5)0 to 10% of a compound represented by the general formula V;
(6)0 to 8% of a compound represented by the general formula VI;
(7)0 to 9% of a compound represented by the general formula VII;
(8)0 to 15% of a compound represented by general formula VIII;
(9) 1-30% of a compound represented by formula IX.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 3-17% of a compound represented by general formula I;
(2) 5-27% of a compound represented by general formula II;
(3) 46-58% of a compound represented by the general formula III;
(4)0 to 14% of a compound represented by the general formula IV;
(5)0 to 5% of a compound represented by the general formula V;
(6)0 to 4% of a compound represented by the general formula VI;
(7)0 to 5% of a compound represented by the general formula VII;
(8)0 to 10% of a compound represented by the general formula VIII;
(9) 5-24% of a compound represented by formula IX.
Preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 10-26% of a compound represented by general formula I;
(2) 10-30% of a compound represented by general formula II;
(3) 48-60% of a compound represented by the general formula III;
(4)0 to 12% of a compound represented by the general formula IV;
(5) 1-7% of a compound represented by formula V;
(6)0 to 8% of a compound represented by the general formula VII.
More preferably, the liquid crystal composition comprises the following components in percentage by weight:
(1) 14-16% of a compound represented by general formula I;
(2) 14-27% of a compound represented by general formula II;
(3) 52-56% of a compound represented by the general formula III;
(4)0 to 9% of a compound represented by the general formula IV;
(5) 3-5% of a compound represented by formula V;
(6)0 to 4% of a compound represented by the general formula VII.
As one of the preferred embodiments of the present invention, the liquid crystal composition comprises the following components in percentage by weight:
(1) 16-17% of a compound represented by general formula I;
(2) 25-27% of a compound represented by formula II;
(3) 52-54.5% of a compound represented by the general formula III;
(4)0 to 5% of a compound represented by the general formula V;
(5)0 to 5% of a compound represented by the general formula VI;
(6)0 to 4.5% of a compound represented by general formula VIII;
(7)0 to 5% of a compound represented by the general formula IX;
or, the liquid crystal composition comprises the following components in percentage by weight:
(1) 16-17% of a compound represented by general formula I;
(2) 25-27% of a compound represented by formula II;
(3) 52-58% of a compound represented by the general formula III;
(4)0 to 3% of a compound represented by the general formula IV;
(5) 4-5% of a compound represented by formula V;
(6)0 to 2.5% of a compound represented by the general formula VII;
or, the liquid crystal composition comprises the following components in percentage by weight:
(1) 5-17% of a compound represented by general formula I;
(2) 5-25% of a compound represented by general formula II;
(3) 46-59% of a compound represented by the general formula III;
(4)0 to 14% of a compound represented by the general formula IV;
(5)0 to 5% of a compound represented by the general formula V;
(6)0 to 6% of a compound represented by the general formula VI;
(7)0 to 4% of a compound represented by the general formula VII;
(8)0 to 11% of a compound represented by the general formula VIII;
(9)0 to 24% of a compound represented by the general formula IX.
The compound represented by the general formula I in the liquid crystal composition provided by the invention is a polyfluoro-substituted terphenyl structure compound, the compound has large dielectric anisotropy and optical anisotropy and is very effective for improving the dielectric anisotropy and the optical anisotropy of the liquid crystal composition, the structure represented by the general formula II comprises a2, 3-difluorobenzene structure compound, the compound has large vertical dielectric, and the compound is very effective for improving the vertical dielectric of the liquid crystal composition and improving the transmittance of a liquid crystal display; the compound represented by the general formula III is of a dicyclohexyl structure, has the characteristics of low rotational viscosity and excellent intersolubility, and is an essential component for fast response liquid crystal display; the structure represented by the general formula IV is a tricyclic neutral liquid crystal compound which has a high clearing point and a large elastic constant and is very effective in improving the clearing point and the elastic constant of the liquid crystal composition.
The method for producing the liquid crystal composition of the present invention is not particularly limited, and it can be produced by mixing two or more compounds by a conventional method, such as a method of mixing the different components at a high temperature and dissolving each other, wherein the liquid crystal composition is dissolved and mixed in a solvent for the compounds, and then the solvent is distilled off under reduced pressure; alternatively, the liquid crystal composition of the present invention can be prepared by a conventional method, for example, by dissolving the component having a smaller content in the main component having a larger content at a higher temperature, or by dissolving each of the components in an organic solvent, for example, acetone, chloroform or methanol, and then mixing the solutions to remove the solvent.
The liquid crystal composition provided by the invention has large vertical dielectric, further has a lower ratio of parallel dielectric to vertical dielectric, and further has higher transmittance. Therefore, the liquid crystal composition provided by the invention is suitable for IPS or FFS type TFT liquid crystal display devices, can obviously improve the transmittance of a liquid crystal display and reduce the energy loss of a backlight source, and is particularly suitable for FFS type liquid crystal displays.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Unless otherwise indicated, percentages in the present invention are weight percentages; the temperature units are centigrade; Δ n represents optical anisotropy (25 ℃); Δ ε represents the dielectric anisotropy (25 ℃, 1000 Hz); γ 1 represents rotational viscosity (mpa.s, 25 ℃); cp represents the clearing point (. degree. C.) of the liquid crystal composition; k11、K22、K33Respectively representing the splay, twist and bend elastic constants (pN, 25 ℃).
In the following examples, the group structures in the liquid crystal compounds are represented by codes shown in Table 1.
Table 1: radical structure code of liquid crystal compound
Take the following compound structure as an example:
In the following examples, the liquid crystal composition was prepared by a thermal dissolution method, comprising the steps of: weighing the liquid crystal compound by a balance according to the weight percentage, wherein the weighing and adding sequence has no specific requirements, generally weighing and mixing the liquid crystal compound in sequence from high melting point to low melting point, heating and stirring at 60-100 ℃ to uniformly melt all the components, filtering, performing rotary evaporation, and finally packaging to obtain the target sample.
In the following examples, the weight percentages of the components in the liquid crystal composition and the performance parameters of the liquid crystal composition are shown in the following tables.
Example 1
Table 2: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 2
Table 3: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 3
Table 4: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 4
Table 5: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 5
Table 6: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 6
Table 7: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 7
Table 8: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 8
Table 9: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 9
Table 10: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 10
Table 11: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 11
Table 12: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 12
Table 13: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 13
Table 14: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 14
Table 15: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 15
Table 16: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 16
Table 17: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 17
Table 18: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 18
Table 19: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 19
Table 20: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 20
Table 21: the weight percentage and performance parameters of each component in the liquid crystal composition
Comparative example 1
Table 22: the weight percentage and performance parameters of each component in the liquid crystal composition
Compared with comparative example 1, examples 1 and 2 have larger vertical dielectric, thereby being beneficial to improving the transmittance of the liquid crystal display.
Transmittance simulations were performed for examples 1, 2 and 1 to obtain the following data table 23:
TABLE 23 comparison of the transmittances of example 1, example 2 and comparative example 1
| Example 1 | Example 2 | Comparative example 1 | |
| Transmittance of light | 0.2986 | 0.3034 | 0.2866 |
The transmittance of example 1 is improved by about 4.0% compared with that of comparative example 1, and the transmittance of example 2 is improved by about 6% compared with that of comparative example 1. The liquid crystal compositions obtained in examples 3 to 20 also have high transmittance, and the test results are substantially the same as those of examples 1 and 2.
From the above embodiments, the liquid crystal composition provided by the present invention has a large vertical dielectric, and further has a lower ratio of parallel dielectric to vertical dielectric, and further has a higher transmittance. Therefore, the liquid crystal composition provided by the invention is suitable for IPS or FFS type TFT liquid crystal display devices, can obviously improve the transmittance of a liquid crystal display and reduce the energy loss of a backlight source, and is particularly suitable for FFS type liquid crystal displays.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (15)
1. The liquid crystal composition is characterized by comprising the following components in percentage by weight:
(1) 16-17% of a compound represented by general formula I;
(2) 25-27% of a compound represented by formula II;
(3) 52-54.5% of a compound represented by the general formula III;
(4)0 to 5% of a compound represented by the general formula V;
(5)0 to 5% of a compound represented by the general formula VI;
(6)0 to 4.5% of a compound represented by general formula VIII;
(7)0 to 5% of a compound represented by the general formula IX;
wherein the content of the first and second substances,
a compound represented by the general formula I:
wherein R is1Is C1～C12Wherein one or more non-adjacent CH2May each be independently substituted with O, S or CH ═ CH; x1Selected from F, CF3、OCF3One of (1);
a compound represented by the general formula II:
wherein R is2、R3Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); a. the1Is trans-1, 4-cyclohexyl or 1, 4-phenylene;
a compound represented by the general formula III:
wherein R is4、R5Independently represent C1～C12Wherein one or more non-adjacent CH2Can be independently of each otherIs substituted with O, S or CH ═ CH; a. the2、A3Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene;
a compound encompassed by formula V:
wherein R is8Is selected from C1～C12Linear alkyl, linear alkoxy or C2～C12One of the linear alkenyl groups of (a); a. the5Is trans-1, 4-cyclohexyl or 1, 4-phenylene in which one or more H atoms on the phenyl ring may be substituted by F atoms;
a compound represented by formula VI:
wherein R is9Is selected from C1～C12Linear alkyl, linear alkoxy or C2～C12One of the linear alkenyl groups of (a); l is1、L2Each independently represents F or H; x2Is F or OCF3；A6Is trans-1, 4-cyclohexyl or 1, 4-phenylene in which one or more H atoms on the phenyl ring may be substituted by F atoms;
a compound represented by formula VIII:
wherein R is12Is C1～C12Straight chain alkyl or C2～C12A linear alkenyl group of (a); r13Is F, C1～C12Straight chain alkyl or C2～C12A linear alkenyl group of (a);
a compound represented by formula IX:
wherein R is14Is C1～C12The linear alkyl group of (1); n is 0 or 1; l is4Is H or CH3；A7、A8、A9Each independently represents:
and/or, the liquid crystal composition further comprises one or more compounds represented by formula IV:
wherein R is6、R7Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); a. the4Is trans-1, 4-cyclohexyl, 1, 4-phenylene in which one or more H atoms on the phenyl ring may be substituted by F;
and/or, the liquid crystal composition further comprises one or more compounds represented by the general formula VII:
wherein R is10、R11Each independently represents C1～C12Straight chain alkyl or C2～C12A linear alkenyl group of (a); l is3Is H or F.
2. The liquid crystal composition of claim 1, wherein the compound represented by formula I is selected from one or more of formulae IA to IC:
wherein R is1Is C1～C7Linear alkyl group of (1).
3. The liquid crystal composition of claim 2, wherein the compound represented by formula I is selected from one or more of IA 1-IC 5:
4. the liquid crystal composition of claim 3, wherein the compound represented by formula I is one or more selected from IA2, IA3, IA5, IC2, and IC 3.
5. The liquid crystal composition of claim 4, wherein the compound represented by formula I is selected from IA2 and/or IA 3.
6. The liquid crystal composition of claim 1, wherein the compound represented by formula II is one or more compounds selected from IIA to IIB:
wherein R is2Represents C1～C7Straight chain alkyl or C2～C7A linear alkenyl group of (a); r3Represents C1～C7Linear alkyl or linear alkoxy groups of (1).
7. The liquid crystal composition of claim 6, wherein the compound represented by formula II is one or more compounds selected from IIA 1-IIB 36:
8. the liquid crystal composition of claim 7, wherein the compound represented by formula II is one or more compounds selected from IIA1, IIA2, IIA14, IIA19, IIA20, IIA21, IIA22, IIA26, IIB19, IIB20 and IIB 32.
9. The liquid crystal composition of claim 8, wherein the compound represented by formula II is one or more compounds selected from IIA19, IIA20, IIA21, IIB19 and IIB 20.
10. The liquid crystal composition of claim 1, wherein the compound represented by formula III is selected from one or more of groups IIIA to IIIC:
wherein R is4Is C1～C7The linear alkyl group of (1); r5Is selected from C1～C7Linear alkyl, linear alkoxy or C2～C7One of the linear alkenyl groups of (1).
11. The liquid crystal composition of claim 10, wherein the compound represented by formula III is selected from one or more of formulae IIIA 1-IIIC 38:
12. the liquid crystal composition of claim 11, wherein the compound represented by formula III is selected from one or more compounds represented by formula IIIA2, IIIA4, IIIA6, IIIA8, IIIA14, IIIA22, IIIA26, IIIA27, IIIB14, IIIB18, IIIB22, IIIC2, IIIC4, IIIC6, IIIC22, IIIC26, IIIC29, and IIIC 30.
13. The liquid crystal composition of claim 12, wherein the compound represented by formula III is selected from one or more of IIIA2, IIIA6, IIIA14, IIIB22, IIIC4, IIIC29, and IIIC 30.
14. Use of the liquid crystal composition of any of claims 1 to 13 in a liquid crystal display device.
15. Use according to claim 14, wherein the liquid crystal display device is an IPS or FFS type TFT liquid crystal display device.
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| CN106753424A (en) * | 2011-08-09 | 2017-05-31 | 默克专利股份有限公司 | Liquid crystal media |
| CN107189791A (en) * | 2016-03-15 | 2017-09-22 | 北京八亿时空液晶科技股份有限公司 | A kind of positive and negative mixed liquid crystal composition and its application |
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| CN106085460A (en) * | 2012-02-15 | 2016-11-09 | 默克专利股份有限公司 | Liquid crystal media |
| CN106433687A (en) * | 2012-09-24 | 2017-02-22 | 捷恩智株式会社 | Liquid crystal display element, and liquid crystal composition and use thereof |
| CN106479513A (en) * | 2015-08-05 | 2017-03-08 | 默克专利股份有限公司 | Liquid crystal media |
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