CN108690635B - Negative dielectric anisotropy liquid crystal composition and application thereof - Google Patents
Negative dielectric anisotropy liquid crystal composition and application thereof Download PDFInfo
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Abstract
The invention relates to a negative dielectric anisotropy liquid crystal composition, which comprises at least one compound represented by a general formula I and at least one compound represented by a general formula II; the compound of the general formula I has large negative dielectric anisotropy, can effectively improve the negative dielectric anisotropy of the liquid crystal composition, reduce the use of polar monomers, increase the use of low-viscosity monomers, reduce the rotational viscosity of a system and improve the response time; the compound represented by the general formula II has large negative dielectric anisotropy and excellent intersolubility. The liquid crystal composition provided by the invention has low rotational viscosity, good low-temperature intersolubility and quick response time, is suitable for VA type liquid crystal display devices such as VA/MVA/PVA/PSVA and the like and IPS (in-plane switching) and FFS (fringe field switching) mode liquid crystal display devices, and is very effective in improving the response time of a liquid crystal display.
Description
Technical Field
The invention relates to a liquid crystal composition, in particular to a nematic liquid crystal composition, which has negative dielectric anisotropy, and more particularly relates to a liquid crystal compound containing a fluoroethoxy structure in the liquid crystal composition. Belonging to the field of liquid crystal materials and application thereof.
Background
Liquid crystals are currently widely used in the field of information display, and have been used in optical communications (s.t.wu, d.k.yang.reflective Liquid Crystal display. wiley, 2001). In recent years, the application fields of liquid crystal compounds have been remarkably widened to various display devices, electro-optical devices, electronic components, sensors, and the like, and nematic liquid crystal compounds have been most widely used in flat panel displays, particularly in systems of TFT active matrix.
Liquid crystal display has experienced a long development route along with the discovery of liquid crystals. In 1888, the first liquid crystal material, cholesterol benzoate, was discovered by the austria phytologist Friedrich reintzer. In 1917, Manguin invented rubbing alignment method to make single domain liquid crystal and study optical anisotropy. The theory of scraping (Swarm) was established by e.bose in 1909 and supported by l.s.ormstein and f.zernike et al (1918), which were later discussed as statistical fluctuations by De Gennes. G.w.oseen and h.zocher created continuum theory in 1933 and was perfected by f.c.frank (1958). M.born (1916) and k.lichtennecker (1926) discovered and studied the dielectric anisotropy of liquid crystals. In 1932, w.kast accordingly classified the nematic phase into two main classes, positive and negative. In 1927, v.freedericksz and v.zolonao found that nematic liquid crystals deformed and had a voltage threshold (freedericksz transition) under the action of an electric or magnetic field. This finding provides the basis for the fabrication of liquid crystal displays.
In 1968, R.Williams, RCA corporation in America, discovered that nematic liquid crystals form fringe domains under the action of an electric field and have a light scattering phenomenon. The g.h.heilmeir was subsequently developed into a dynamic scattering display mode and made the first Liquid Crystal Display (LCD) in the world. In the early seventies, Helfrich and Schadt invented the TN principle, and people made them into display devices (TN-LCD) by using the combination of TN photoelectric effect and integrated circuit, thus developing a broad prospect for the application of liquid crystal. Since the seventies, the application of liquid crystal in display has been developed in a breakthrough due to the development of large-scale integrated circuits and liquid crystal materials, and the Super Twisted Nematic (STN) mode proposed by t.scheffer et al in 1983-1985 and the Active Matrix (AM) mode proposed by p.brody in 1972 were adopted again. Conventional TN-LCD technology has been developed into STN-LCD and TFT-LCD technology, and although the number of scan lines of STN can reach 768 lines or more, problems of response speed, viewing angle, gray scale and the like still exist when the temperature rises, so that the active matrix display mode is mostly adopted for large-area, high-information content and color display. TFT-LCD has been widely used in direct view televisions, large screen projection televisions, computer terminal displays and some military instrument displays, and TFT-LCD technology is believed to have wider application prospects.
Where "active matrix" includes two types: 1. OMS (metal oxide semiconductor) or other diodes on a silicon wafer as a substrate. 2. A Thin Film Transistor (TFT) on a glass plate as a substrate.
The use of single crystal silicon as a substrate material limits the display size because of the many problems that arise with the assembly of parts of the display device and even the modules at their junctions. Thus, the second type of thin film transistor is a promising type of active matrix, and the photoelectric effect utilized is typically the TN effect. TFTs include compound semiconductors, such as CdSe, or TFTs based on polycrystalline or amorphous silicon.
Negative liquid crystals, which were proposed at the beginning of the 80's last century, are mainly used in VA mode, and have major advantages in high contrast and major disadvantages in small viewing angle and slow response time. With the development of display technology, MVA, PVA, PSVA, and the like technologies have appeared in succession, solving the problems of response time and viewing angle. In recent years, as touch panels become mainstream in the market of mobile devices, IPS and FFS type hard-screen displays have inherent advantages, and both IPS and FFS type displays can use positive liquid crystals and negative liquid crystals, and the positive liquid crystals are aligned along the direction of electric field lines due to the bending electric field existing in the displays, thereby causing bending of molecules and lowering of transmittance; the negative liquid crystal is arranged perpendicular to the direction of the electric field lines, so that the transmittance is greatly improved, and the method is the best method for improving the transmittance and reducing the backlight power consumption at present. However, the response time problem of negative liquid crystals is a significant problem that is currently encountered, and FFS displays using negative liquid crystals have a response time that is 50% or more slower than FFS displays using positive liquid crystals. Therefore, how to increase the response time of the negative liquid crystal is a key issue at present.
Specifically, the response time of the LCD depends on (d ^2 gamma 1)/Keff (d is the thickness of the liquid crystal layer, gamma 1 is the liquid crystal rotational viscosity, and Keff is the effective elastic constant), therefore, the purposes of improving the response time can be achieved by reducing the rotational viscosity, reducing the thickness of the liquid crystal layer and improving the elastic constant, and the thickness of the liquid crystal layer depends on the design of the LCD; for liquid crystal compositions, it is most effective to reduce the rotational viscosity and the liquid crystal thickness.
The liquid crystal composition provided by the invention has low rotational viscosity, and can effectively reduce the response time of a liquid crystal display.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a liquid crystal composition with negative dielectric anisotropy. The composition comprises at least one compound represented by a general formula I and at least one compound represented by a general formula II.
The general formula I is specifically as follows:
in the general formula I, R1Represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); z1represents-CH2O-or-CH2CH2-。
The general formula II is specifically:
in the general formula II, R2、R3Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); ring A1Represents trans-1, 4-cyclohexyl or 1, 4-phenylene.
The compound represented by the general formula I provided by the invention is a liquid crystal compound containing 2, 3-difluorobenzene and a fluoroethoxy structure, has larger negative dielectric anisotropy, can effectively improve the negative dielectric anisotropy of a liquid crystal composition, reduces the use of polar monomers, increases the use of low-viscosity monomers, reduces the rotational viscosity of a system, and improves the response time. In the liquid crystal composition provided by the invention, the sum of all liquid crystal components is 100%; the content of the compound of the general formula I in the composition is preferably 5-70%, more preferably 8-60%, 10-57%, 8-35%, 10-35%, 30-65%, 30-57%, 15-65%, 19-57%, 8-45%, 10-42%, 15-60%, 20-57%, 8-40%, 10-37%, 10-42%, 13-60%, 16-57%, 13-45%, 16-39% or 57%.
Preferably, the compound represented by the general formula I is selected from one or more compounds represented by formulas IA to IB:
in IA to IB, R1Represents C1～C7Straight chain alkyl or C2～C7A linear alkenyl group of (a); preferably C1～C5Straight chain alkyl or C2～C5Linear alkenyl groups of (a).
As a preferable mode of the invention, the compound represented by the general formula I is selected from one or more of formulas IA 1-IA 8 and IB 1-IB 8:
the compound represented by the general formula II provided by the invention is a liquid crystal compound with two rings having 2, 3-difluoro-1, 4-phenyl, and the compound has larger negative dielectric anisotropy and excellent intersolubility. In the liquid crystal composition provided by the invention, the sum of all liquid crystal components is 100%; the content of the compound of the general formula II in the composition is preferably 5-40%, more preferably 8-35%, 10-30%, 10-35%, 15-27%, 15-35%, 15-30%, 8-20%, 10-20%, 15-29%, 8-30%, 10-24%, 8-26%, 10-23%, 23-24% or 24%.
Preferably, the compounds of formula II provided by the present invention are selected from one or more of IIA and IIB:
in IIA and IIB, R is2Represents C1～C7Straight chain alkyl or C2～C7Linear alkenyl of (3), preferably C1～C5Straight chain alkyl or C2～C5A linear alkenyl group of (a); r3Represents C1～C7Linear alkyl or alkoxy of, preferably C1～C5Linear alkyl or alkoxy groups of (a).
As a preferable embodiment of the invention, the compound of the general formula II is selected from one or more of IIA 1-IIA 32, IIB 1-IIB 28:
the liquid crystal composition provided by the invention can further comprise one or more compounds shown in the general formula III. The compound represented by the general formula III provided by the invention is of a bicyclic structure and has the characteristics of low rotational viscosity and excellent intersolubility. In the liquid crystal composition provided by the invention, the sum of all liquid crystal components is 100%; the content of the compound of the general formula III in the composition is preferably 5-65%, more preferably 10-55%, 13-53%, 15-55%, 19-53%, 10-40%, 13-36%, 10-50%, 13-46%, 20-55%, 22-53%, 10-35%, 13-35%, 30-55%, 30-53%, 13-50%, 20-55%, 22-50%, 13-15% or 19%.
The general formula III is specifically:
in the general formula III, R4、R5Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); ring A2Ring A3Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene.
Preferably, the compound represented by the general formula III is selected from one or more of IIIA to IIIC:
in IIIA to IIIC, R4Represents C1～C7Preferably C1～C5The linear alkyl group of (1); r5Represents C1～C7Linear alkyl, linear alkoxy or C2～C7Linear alkenyl of (3), preferably C1～C5Linear alkyl, linear alkoxy or C2～C5Linear alkenyl groups of (a).
In a preferred embodiment of the present invention, the compound represented by formula III is one or more compounds selected from the group consisting of compounds represented by formulae IIIA1 to IIIA34, IIIB1 to IIIB24, and IIIC1 to IIIC 24:
the liquid crystal composition provided by the invention can further comprise one or more compounds selected from the structures shown in the general formula IV. The compound with the structure of the general formula IV is a nonpolar tricyclic compound, and the monomer has a high clearing point and a large elastic constant, so that the elastic constant of the liquid crystal composition is favorably improved. In the liquid crystal composition provided by the invention, the sum of all liquid crystal components is 100%; the content of the compound shown in the general formula IV in the composition is preferably 0-45%, more preferably 0-45%, 0-30%, 0-35%, 0-25%, 0-22%, 0-29%, 5-30%, 4-30%, 1-35%, 1-25% or 4-22%.
The general formula IV is specifically:
in the general formula IV, R6、R7Each independently represents C1～C12Wherein one or more non-adjacent CH2May be substituted by O or CH ═ CH; ring A4Selected from the following structures:
preferably, the compound represented by formula IV is selected from one or more of formulae IVA to IVC:
in the IVA to IVC, R6Represents C2～C10Is preferably C2～C5A linear alkyl or linear alkenyl group of (a); r7Represents C1～C8Preferably C1～C5Linear alkyl group of (1).
In a preferred embodiment of the present invention, the compound represented by formula IV is selected from one or more of the structures of formulae IVA 1-IVA 18, IVB 1-IVB 22, IVC 1-IVC 30:
the liquid crystal composition provided by the invention can further comprise one or more compounds selected from the compounds shown in the general formula V. The compound represented by the general formula V has large optical anisotropy, and is very effective in improving the dielectric anisotropy of the liquid crystal composition. In the liquid crystal composition provided by the invention, the sum of all liquid crystal components is 100%; the content of the compound of the general formula V in the composition is preferably 0-30%, more preferably 0-20%, 0-17%, 0-15%, 1-20%, 5-17% or 5-6%.
The general formula V is specifically:
in the general formula V, R8Represents C1～C12Straight chain alkyl or C2～C12A linear alkenyl group of (a); r9Representative F, C1～C12Straight-chain alkyl, straight-chain alkoxy C of2～C12A linear alkenyl group of (a); l is1、L2、L3Each independently represents H or F, preferably L1、L2、L3Not simultaneously F.
Preferably, the compound of formula V is selected from one or more of VA to VD;
in the VA to VD, R8Represents C1～C7Straight chain alkyl or C2～C7Linear alkenyl of (3), preferably C1～C5Straight chain alkyl or C2～C5A linear alkenyl group of (a); r9Represents C1～C7Linear alkyl, linear alkoxy or C2～C7Linear alkenyl of (3), preferably C1～C5Linear alkyl, linear alkoxy or C2～C5Linear alkenyl groups of (a).
As a preferred embodiment of the present invention, the compound represented by the general formula V is selected from one or more of the formulae VA 1-VA 4, VB 1-VB 24, VC 1-VC 14, VD 1-VD 24:
in order to ensure that the components realize synergistic action and improve the comprehensive effect of the liquid crystal material, the invention further optimizes the dosage of each component in the liquid crystal material.
Specifically, the liquid crystal composition provided by the invention comprises the following components: (1) 5-70% of a compound represented by general formula I; (2) 5-40% of a compound represented by general formula II; (3) 5-65% of a compound represented by the general formula III; (4)0 to 45% of a compound represented by the general formula IV; (5)0 to 30% of a compound represented by the general formula V.
Preferably, the liquid crystal composition comprises the following components: (1) 8-60% of a compound represented by general formula I; (2) 8-35% of a compound represented by general formula II; (3) 10-55% of a compound represented by the general formula III; (4)0 to 35% of a compound represented by the general formula IV; (5)0 to 20% of a compound represented by the general formula V.
More preferably, the liquid crystal composition comprises the following components: (1) 10-57% of a compound represented by general formula I; (2) 10-30% of a compound represented by general formula II; (3) 13-53% of a compound represented by formula III; (4)0 to 30% of a compound represented by the general formula IV; (5)0 to 17% of a compound represented by the general formula V.
Preferably, the liquid crystal composition comprises the following components: (1) 8-35% of a compound represented by general formula I; (2) 8-35% of a compound represented by general formula II; (3) 15-55% of a compound represented by general formula III; (4)0 to 35% of a compound represented by the general formula IV; (5)0 to 20% of a compound represented by the general formula V.
More preferably, the liquid crystal composition comprises the following components: (1) 10-35% of a compound represented by general formula I; (2) 10-30% of a compound represented by general formula II; (3)19 to 53% of a compound represented by the general formula III; (4) 5-30% of a compound represented by formula IV; (5)0 to 17% of a compound represented by the general formula V.
Preferably, the liquid crystal composition comprises the following components: (1) 30-65% of a compound represented by general formula I; (2) 10-35% of a compound represented by general formula II; (3) 10-40% of a compound represented by the general formula III; (4)0 to 25% of a compound represented by the general formula IV; (5)0 to 20% of a compound represented by the general formula V.
More preferably, the liquid crystal composition comprises the following components: (1) 30-57% of a compound represented by general formula I; (2) 15-27% of a compound represented by general formula II; (3) 13-36% of a compound represented by formula III; (4)0 to 22 of a compound represented by the general formula IV; (5)0 to 15% of a compound represented by the general formula V.
Preferably, the liquid crystal composition comprises the following components: (1) 15-65% of a compound represented by general formula I; (2) 15-35% of a compound represented by general formula II; (3)10 to 50% of a compound represented by the general formula III; (4)0 to 35% of a compound represented by the general formula IV; (5)0 to 20% of a compound represented by the general formula V.
More preferably, the liquid crystal composition comprises the following components: (1) 19-57% of a compound represented by general formula I; (2) 15-30% of a compound represented by general formula II; (3)13 to 46% of a compound represented by the general formula III; (4)0 to 29% of a compound represented by the general formula IV; (5)0 to 15% of a compound represented by the general formula V.
Preferably, the liquid crystal composition comprises the following components: (1) 8-45% of a compound represented by general formula I; (2) 8-20% of a compound represented by general formula II; (3) 20-55% of a compound represented by the general formula III; (4)0 to 35% of a compound represented by the general formula IV; (5)0 to 20% of a compound represented by the general formula V.
More preferably, the liquid crystal composition comprises the following components: (1) 10-42% of a compound represented by general formula I; (2) 10-20% of a compound represented by general formula II; (3) 22-53% of a compound represented by the general formula III; (4) 4-30% of a compound represented by formula IV; (5)0 to 17% of a compound represented by the general formula V.
Preferably, the liquid crystal composition comprises the following components: (1) 15-60% of a compound represented by general formula I; (2) 10-35% of a compound represented by general formula II; (3) 10-35% of a compound represented by general formula III; (4)0 to 35% of a compound represented by the general formula IV; (5)0 to 20% of a compound represented by the general formula V.
More preferably, the liquid crystal composition comprises the following components: (1) 20-57% of a compound represented by general formula I; (2) 15-29% of a compound represented by general formula II; (3) 13-35% of a compound represented by general formula III; (4)0 to 29% of a compound represented by the general formula IV; (5)0 to 15% of a compound represented by the general formula V.
Preferably, the liquid crystal composition comprises the following components: (1) 8-40% of a compound represented by general formula I; (2) 8-35% of a compound represented by general formula II; (3) 30-55% of a compound represented by the general formula III; (4)0 to 35% of a compound represented by the general formula IV; (5)0 to 20% of a compound represented by the general formula V.
More preferably, the liquid crystal composition comprises the following components: (1) 10-37% of a compound represented by general formula I; (2) 10-30% of a compound represented by general formula II; (3) 30-53% of a compound represented by the general formula III; (4) 4-30% of a compound represented by formula IV; (5)0 to 17% of a compound represented by the general formula V.
Preferably, the liquid crystal composition comprises the following components: (1) 8-45% of a compound represented by general formula I; (2) 8-35% of a compound represented by general formula II; (3) 15-55% of a compound represented by general formula III; (4) 1-35% of a compound represented by formula IV; (5)0 to 20% of a compound represented by the general formula V.
More preferably, the liquid crystal composition comprises the following components: (1) 10-42% of a compound represented by general formula I; (2) 10-30% of a compound represented by general formula II; (3)19 to 53% of a compound represented by the general formula III; (4) 4-30% of a compound represented by formula IV; (5)0 to 17% of a compound represented by the general formula V.
Preferably, the liquid crystal composition comprises the following components: (1) 13-60% of a compound represented by general formula I; (2) 8-30% of a compound represented by general formula II; (3) 10-55% of a compound represented by the general formula III; (4)0 to 25% of a compound represented by the general formula IV; (5)1 to 20% of a compound represented by the general formula V.
More preferably, the liquid crystal composition comprises the following components: (1) 16-57% of a compound represented by general formula I; (2) 10-24% of a compound represented by general formula II; (3)13 to 50% of a compound represented by the general formula III; (4)0 to 22% of a compound represented by the general formula IV; (5) 5-17% of a compound represented by the general formula V.
Preferably, the liquid crystal composition comprises the following components: (1) 13-45% of a compound represented by general formula I; (2) 8-26% of a compound represented by general formula II; (3) 20-55% of a compound represented by the general formula III; (4)1 to 25% of a compound represented by the general formula IV; (5)1 to 20% of a compound represented by the general formula V.
More preferably, the liquid crystal composition comprises the following components: (1) 16-39% of a compound represented by general formula I; (2) 10-23% of a compound represented by general formula II; (3) 22-50% of a compound represented by the general formula III; (4) 4-22% of a compound represented by formula IV; (5) 5-17% of a compound represented by the general formula V.
As a preferred embodiment of the present invention, the composition comprises the following components: (1) 10-57% of a compound represented by general formula I; (2) 10-30% of a compound represented by general formula II; (3) 13-53% of a compound represented by formula III; (4)0 to 30% of a compound represented by the general formula IV; (5)0 to 17% of a compound represented by the general formula V.
Or, the composition comprises the following components: (1) 57% of a compound represented by the general formula I; (2) 24% of a compound represented by the general formula II; (3) 19% of a compound represented by the general formula III.
Or, the composition comprises the following components: (1) 10-42% of a compound represented by general formula I; (2) 10-30% of a compound represented by general formula II; (3)19 to 53% of a compound represented by the general formula III; (4) 5-30% of a compound represented by the general formula IV.
Or, the composition comprises the following components: (1) 57% of a compound represented by the general formula I; (2) 23-24% of a compound represented by general formula II; (3) 13-15% of a compound represented by formula III; (4) 5-6% of a compound represented by the general formula V.
Or, the composition comprises the following components: (1) 16-39% of a compound represented by general formula I; (2) 10-23% of a compound represented by general formula II; (3) 22-50% of a compound represented by the general formula III; (4) 4-22% of a compound represented by formula IV; (5) 5-17% of a compound represented by the general formula V.
The compound provided by the invention is a tricyclic compound containing a 2, 3-difluorobenzene structure, the structure is a negative dielectric anisotropy liquid crystal compound, the tail end of the compound is in a fluoroethoxy structure, and research shows that the negative dielectric anisotropy of the structure is greatly improved after the ethoxy is replaced by fluorine, and the test result is as follows:
the comparison shows that the fluoroethoxyl compound provided by the invention has large negative dielectric anisotropy, can effectively improve the negative dielectric anisotropy of the liquid crystal composition, reduce the use of polar monomers, increase the use of low-viscosity monomers, reduce the rotational viscosity of a system and improve the response time; the compound represented by the general formula II has larger negative dielectric anisotropy and excellent intersolubility; the compound represented by the general formula III is a bicyclic structure, has the characteristics of low rotational viscosity and excellent intersolubility, and is an essential component for fast response liquid crystal display, the compound represented by the general formula IV is a nonpolar tricyclic compound, and the monomer has a high clearing point and a large elastic constant, so that the elastic constant of the liquid crystal composition is favorably improved; the compound represented by the general formula V has large optical anisotropy, and is very effective in improving the dielectric anisotropy 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 low rotational viscosity, good low-temperature intersolubility and quick response time, and is suitable for VA type liquid crystal display devices such as VA/MVA/PVA/PSVA and the like and IPS and FFS mode liquid crystal display devices. It is very effective for improving the response time of the liquid crystal display.
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); v10Represents a threshold voltage, which is a characteristic voltage (V, 25 ℃) at which the relative transmittance changes by 10%; γ 1 represents rotational viscosity (mpa.s, 25 ℃); cp represents the clearing point (. degree. C.) of the liquid crystal composition; k11、K22、K33Respectively represent the splay and twistBending and flexural 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
Example 21
Table 22: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 22
Table 23: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 23
Table 24: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 24
Table 25: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 25
Table 26: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 26
Table 27: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 27
Table 28: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 28
Table 29: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 29
Table 30: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 30
Table 31: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 31
Table 32: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 32
Table 33: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 33
Table 34: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 34
Table 35: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 35
Table 36: percentage of each component in liquid crystal composition and performance parameters
Example 36
Table 37: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 37
Table 38: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 38
Table 39: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 39
Table 40: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 40
Table 41: the weight percentage and performance parameters of each component in the liquid crystal composition
EXAMPLE 41
Table 42: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 42
Table 43: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 43
Table 44: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 44
Table 45: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 45
Table 46: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 46
Table 47: the weight percentage and performance parameters of each component in the liquid crystal composition
Comparative example 1
Table 48: the weight percentage and performance parameters of each component in the liquid crystal composition
The liquid crystal compositions obtained in example 1 and comparative example 1 were compared together for each of their performance parameter values, see Table 49.
Table 49: comparison of Performance parameters of liquid Crystal compositions
| △n | △ε | Cp | γ1 | K11 | K22 | K33 | |
| Example 1 | 0.108 | -3.8 | 90 | 81 | 15.0 | 7.5 | 16.3 |
| Comparative example 1 | 0.108 | -3.8 | 90 | 96 | 14.7 | 7.4 | 16.5 |
By comparison, it can be seen that: example 1 provides a liquid crystal composition having a low rotational viscosity, i.e., having a faster response time, compared to comparative example 1.
From the above embodiments, the liquid crystal composition provided by the present invention has low viscosity, high resistivity, suitable optical anisotropy, good low-temperature intersolubility, large elastic constant, and excellent light stability and thermal stability, and can reduce the response time of the liquid crystal display, thereby solving the problem of slow response speed of the liquid crystal display. Therefore, the liquid crystal composition provided by the invention is suitable for VA display modes such as VA/MVA/PVA/PSVA and the like and IPS and FFS type TFT liquid crystal display devices.
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 (4)
1. A negative dielectric anisotropy liquid crystal composition is characterized by comprising the following components in percentage by weight:
2. use of the liquid crystal composition of claim 1 in a liquid crystal display device.
3. Use of the liquid crystal composition of claim 1 in a fast response liquid crystal display device.
4. Use of the liquid crystal composition of claim 1 in VA, MVA, PVA, PSVA liquid crystal display devices and IPS, FFS mode liquid crystal display devices.
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| CN104603235A (en) * | 2012-09-11 | 2015-05-06 | Dic株式会社 | Nematic liquid crystal composition and liquid crystal display element using same |
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