CN107189791B

CN107189791B - Positive and negative mixed liquid crystal composition and application thereof

Info

Publication number: CN107189791B
Application number: CN201610146600.8A
Authority: CN
Inventors: 陈卯先; 王杰; 储士红; 未欣; 陈海光; 姜天孟; 郭云鹏; 袁瑾; 伍嘉琦; 田会强
Original assignee: Beijing Bayi Space LCD Technology Co Ltd
Current assignee: Beijing Bayi Space LCD Technology Co Ltd
Priority date: 2016-03-15
Filing date: 2016-03-15
Publication date: 2020-10-27
Anticipated expiration: 2036-03-15
Also published as: CN107189791A

Abstract

The invention relates to the field of liquid crystal materials, in particular to a positive and negative mixed liquid crystal composition and application thereof. The liquid crystal composition has the characteristics of low viscosity, high resistivity, good low-temperature intersolubility, high response speed and excellent transmittance, and can be used for fast-response liquid crystal display in various display modes. Currently, FFS and IPS are the most mainstream display modes, but the problem of low transmittance of FFS and IPS becomes a key problem to be solved; it has been found through experiments that a liquid crystal composition having a large vertical dielectric has a high transmittance, and thus can achieve the problem of improving luminance without increasing power consumption. The liquid crystal composition provided by the invention has large vertical dielectric, and can effectively improve the transmittance characteristic of a liquid crystal display, particularly in displays of FFS and IPS display modes.

Description

Positive and negative mixed liquid crystal composition and application thereof

Technical Field

The invention belongs to the technical field of liquid crystal materials, and particularly relates to a positive-negative mixed liquid crystal composition and application thereof in a liquid crystal display.

Background

Display is a process of converting an electrical signal (data information) into visible light (visual information), and a Man-Machine Interface (MMI) is a device for completing display. Flat Panel Displays (FPDs) are the most popular type of Display device at present. A Liquid Crystal Display (LCD) is the earliest developed and commercialized product among FPDs. Currently, Thin Film Transistor liquid crystal displays (TFT-LCDs) have become the mainstream product in LCD applications.

In terms of the operating principle, the LCD device displays an image recognizable by a user by generating light and shade (and thus color change) corresponding to the image to be displayed from light emitted from a backlight source through a polarizer, a liquid crystal cell (liquid crystal molecules), and the like. That is, the brightness of the LCD depends on various factors such as the relative amount of light passing through the liquid crystal cell (referred to as the transmittance of the liquid crystal cell), the relative amount of light passing through the color filter (the transmittance of the CF), and the brightness of the backlight.

The introduction of different display modes has led to a significant improvement in the performance of Liquid Crystal Displays (LCDs), and the LCDs are more widely used in different fields such as smart phones, displays, portable tablet computers, televisions, and the like. These applications place higher display requirements on liquid crystal displays, such as high contrast, wide viewing angle, fast response and high transmittance. Among them, in the case of ultra-high resolution, the aperture ratio is reduced due to the reduction in pixel size, so that a high transmittance display is important.

The dielectric properties of the liquid crystal are expressed by a dielectric constant. For the dielectric constant of the electric field parallel to the director of the liquid crystal_//Indicating the dielectric constant of the electric field perpendicular to the director of the liquid crystal_⊥Denotes that the dielectric anisotropy constant is Δ ═_//-_⊥. If the direction of the permanent dipole moment of the polar group of the liquid crystal molecule coincides with the direction of the long axis of the molecule, the degree of electron shift in the direction of the long axis of the liquid crystal molecule is the largest, and thus, the dipole moment in the direction parallel to the long axis of the molecule is large, the dielectric anisotropy is positive, Δ > 0, and such a liquid crystal is called a positive liquid crystal. If the direction of the permanent dipole moment of the polar group of the liquid crystal molecule is perpendicular to the direction of the long axis of the molecule, the degree of electron shift in the direction of the short axis of the liquid crystal molecule is the largest, and thus, a liquid crystal having a small dipole moment in the direction perpendicular to the long axis of the molecule and a negative dielectric anisotropy, Δ < 0, is called a negative liquid crystal.

Currently, in the liquid crystal display market, the display modes with competitiveness mainly include in-plane switching (IPS), fringe-field switching (FFS), and Vertical Alignment (VA). Among these display modes, Vertical Alignment (VA), in-plane switching (IPS), and Fringe Field Switching (FFS) are all characterized by a wide viewing angle, but VA displays are typical soft-screen displays and are not suitable for use on touch devices, while IPS and FFS displays have very good hard-screen characteristics and are the best choice for touch-screen devices.

When the positive liquid crystal is used in an IPS/FFS display mode, a fast response can be obtained and good reliability is obtained; while a negative liquid crystal can obtain a higher transmittance when used in an IPS/FFS display mode, the negative liquid crystal has a relatively high viscosity and therefore has a relatively slow response time. Therefore, Hybrid liquid crystal with negative components added in the traditional positive liquid crystal mixture is produced, so that the Hybrid liquid crystal has the advantage of quick response of the positive liquid crystal, and meanwhile, the penetration rate can be effectively improved, and the overall power consumption of the liquid crystal display device can be greatly reduced.

Disclosure of Invention

The invention aims to provide a positive and negative mixed liquid crystal composition, which is used for IPS and FFS mode liquid crystal displays, and combines a positive liquid crystal compound and a negative liquid crystal compound into a liquid crystal composition with excellent performance so as to improve the transmittance characteristic of the display and reduce the overall power consumption of the liquid crystal display.

In order to solve the above problems, the liquid crystal composition proposed by the present invention comprises at least one compound of the general formula I:

and at least one compound of formula II:

wherein R is₁、R₂、R₃Each independently represents C₁～C₁₂Linear alkyl, alkoxy or C₂～C₁₂A linear alkenyl group of (a); n is₁、n₂、n₃Each independently represents 0 or 1; l is₁、L₂Each independently represents H or F; l is₃、L₄Each independently represents H or CH₃Wherein at least one represents CH₃(ii) a X represents F, CF₃Or OCF₃；A₁、A₂、A₃Each independently represents:

wherein A is₁、A₂、A₃At least one of them represents

A₄、A₅、A₆Each independently represents:

the compound represented by the general formula I provided by the invention is a 2, 3-difluoro compound containing a cyclohexene structure, and the compound has negative dielectric anisotropy and low rotational viscosity performance.

Specifically, the compound of the general formula I provided by the invention is selected from one or more of the following formulas I-A to I-M:

wherein R is₁Represents C₁～C₈Straight chain alkyl or C₂～C₈Linear alkenyl of (A), R₂Represents C₁～C₈Linear alkyl or alkoxy groups of (a).

Preferably, the liquid crystal compound provided by the invention is selected from one or more of formula I-A-1 to formula I-M-15:

more preferably, the compounds of the general formula I provided by the present invention are selected from the group consisting of compounds of the formula I-A-10, I-A-12, I-A-14, I-A-16, I-A-22, I-B-10, I-B-12, I-B-14, I-B-16, I-B-22, I-C-1, I-C-2, I-C-9-I-C-18, I-C-27, I-C-28, I-C-29, I-C-33, I-C-34, I-C-35, I-D-1, I-D-2, I-D-9-I-D-18, I-B-14, I-C-22, I-C-3, I-D-1, I-D-, I-D-27, I-D-28, I-D-29, I-D-33, I-D-34, I-D-35, I-E-1, I-E-2, I-E-9 to I-E-18, I-E-27, I-E-28, I-E-29, I-E-33, I-E-34, I-E-35, I-F-1, I-F-2, I-F-9 to I-F-18, I-F-27, I-F-28, I-F-29, I-F-33, I-F-34, I-F-35, I-D-33, I-E-34, I-E-3, I-E-9, I-E-18, I-F-27, I-F-28, I-F, One or more of I-G-9-I-G-18, I-H-9-I-H-18, I-I-9-I-18, I-J-9-I-J-18, I-K-6, I-K-7, I-L-6, I-L-7, I-M-6 and I-M-7.

In each embodiment of the present invention, taking any one of the liquid crystal compositions as an example (total mass is 100%), the content of the compound represented by the general formula I is preferably 1% to 60%, more preferably 3.5% to 40%, and preferable ranges further include, for example, 3.5% to 35%, 3.5% to 12%, 5% to 12%, 4% to 24%, 4% to 30%, and the like.

The compound of the general formula II provided by the invention is a liquid crystal compound containing difluoromethoxy bridged bonds, and the compound has great positive dielectric anisotropy.

Specifically, the compound of the general formula II provided by the invention is selected from one or more of the compounds represented by the formulas II-A to II-Z:

wherein R is₃Represents C₂～C₈Linear alkyl group of (1).

Preferably, the compounds of formula II provided by the present invention are selected from one or more of the formulae II-A-1 to II-Z-4:

more preferably, the compound of the general formula II provided by the invention is selected from one or more of the compounds of the formulas II-E-2, II-E-3, II-F-1, II-F-2, II-F-3, II-F-4, II-J-2, II-K-1, II-K-2, II-M-3, II-P-1 and II-P-2.

In each embodiment of the present invention, taking any one of the liquid crystal compositions as an example (total mass is 100%), the content of the compound represented by the general formula II is preferably 1% to 60%, more preferably 5% to 40%, and preferable ranges further include, for example, 10% to 30%, 20% to 39%, 5% to 19.5%, 5% to 38%, 8.5% to 30%, and the like.

The liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula III:

wherein R is₄、R₅Each independently represents C₁～C₁₂Linear alkyl, linear alkoxy or C₂～C₁₂Linear alkenyl of (A)₇、A₈Each independently represents 1, 4-cyclohexyl or 1, 4-phenylene.

Specifically, the liquid crystal compound of the general formula III provided by the invention is selected from one or more of the formulas III-A to III-C:

wherein R is₄Represents C₁～C₈Linear alkyl radical of (2), R₅Represents C₁～C₈Linear alkyl, linear alkoxy or C₂～C₈Linear alkenyl groups of (a).

Preferably, the compound represented by formula III is selected from one or more of formulas III-A-1 through III-C-24:

more preferably, the compound represented by formula III is selected from one or more of the group consisting of formulas III-A-1 to III-A-5, III-A-14, III-A-19, III-A-24, III-A-25, III-B-2, III-B-4, III-B-18, III-B-22, III-C-2, III-C-4, III-C-15, III-C-20.

In each embodiment of the present invention, taking any one of the liquid crystal compositions as an example (total mass is 100%), the content of the compound represented by the general formula III is preferably 0% to 80%, and is preferably an optional component, and when the compound is an optional component, the appropriate amount is 13% to 60.5%, and further suitable preferable ranges include, for example, 13% to 41%, 19% to 48%, 41% to 60.5%, 17% to 60%, 55% to 60.5%, 13% to 48%, and the like.

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～C₁₂Linear alkenyl of (A)₉Represents 1, 4-cyclohexyl or 1, 4-phenylene.

Specifically, the liquid crystal compound of the general formula IV provided by the invention is selected from one or more of the formula IV-A or the formula IV-B:

wherein R is₆Represents C₁～C₈Straight chain alkyl or C₂～C₈Linear alkenyl of (A), R₇Represents C₁～C₈Linear alkyl group of (1).

Preferably, the compound represented by formula IV is selected from one or more of formulas IV-A-1 through IV-B-28:

more preferably, the compound represented by formula IV is selected from one or more of the compounds of formula IV-A-1, IV-A-2, IV-A-6, IV-A-10, IV-A-17, IV-A-25, IV-B-1, IV-B-2, IV-B-6, IV-B-8, IV-B-17, IV-B-19.

In each embodiment of the present invention, taking any liquid crystal composition as an example (total mass is 100%), the content of the compound represented by the general formula IV is preferably 0% to 40%, more preferably 0% to 30% (more preferably 0% to 25.5%), and when the amount of addition is not 0, suitable addition ranges include, for example, 12% to 24%, 2% to 25.5%, 13% to 25.5%, 4% to 25.5%, and the like.

The liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula V:

wherein R is₈Represents C₁～C₁₂Straight chain alkyl or C₂～C₁₂Linear alkenyl of, L₅、L₆Each independently represents H or F, Y represents F or OCF₃，A₁₁Represents:

A₁₀represents:

specifically, the compound represented by the general formula V provided by the invention is selected from one or more of the formulas V-A to V-Q:

wherein R is₈Represents C₁～C₈Straight chain alkyl or C₂～C₈A linear alkenyl group of (a); preferably C₂～C₅Linear alkyl or linear alkenyl of (1).

In each embodiment of the present invention, taking any liquid crystal composition as an example (total mass is 100%), the content of the compound represented by the general formula V is preferably 0% to 42%, more preferably 0% to 39% (more preferably 0% to 22% or 0 to 17%), and when the amount of addition is other than 0, suitable addition ranges include, for example, 2% to 42%, 4% to 22%, 8% to 39%, 5% to 17%, 5% to 42%, and the like.

The liquid crystal compositions provided herein further comprise one or more compounds of formula VI:

wherein R is₉Represents C₁～C₁₂Straight chain alkyl or C₂～C₁₂Linear alkenyl of (A), R₁₀Representative F, C₁～C₁₂Straight chain alkyl or C₂～C₁₂Linear alkenyl groups of (a).

Specifically, the compounds of the general formula VI provided by the invention are selected from one or more of the formulas VI-A or VI-B:

wherein R is₉、R₁₀Each independently represents C₁～C₈Straight chain alkyl or C₂～C₈A linear alkenyl group of (a); preferably C₁～C₅Straight chain alkyl or C₂～C₅Linear alkenyl groups of (a).

In each embodiment of the present invention, taking any liquid crystal composition as an example (total mass is 100%), the content of the compound represented by the general formula VI is preferably 0% to 13%, more preferably 0% to 11% (more preferably 0% to 25.5%), and when the amount of addition is not 0, suitable addition ranges include, for example, 3% to 13%, 5% to 11%, 7% to 13%, and the like.

The liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula VII:

wherein R is₁₁、R₁₂Each independently represents C₁～C₁₂Linear alkyl of (2), L₇、L₈Each independently represents H or F, A₁₂Represents trans-1, 4-cyclohexyl or 1, 4-phenylene.

Specifically, the compound of the general formula VII provided by the invention is selected from one or more of the formula VII-A to the formula VII-C:

wherein R is₁₁、R₁₂Each independently represents C₁～C₈The linear alkyl group of (1); preferably C₂～C₅Linear alkyl group of (1).

In each embodiment of the present invention, taking any liquid crystal composition as an example (total mass is 100%), the content of the compound represented by the general formula VII is preferably 0% to 15%, more preferably 0% to 8% (more preferably 0% to 7%), and when the amount of addition is not 0, suitable addition ranges include, for example, 2% to 15%, 3% to 8%, 2% to 7%, 7% to 15%, and the like.

The liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula VIII:

wherein R is₁₃Represents C₁～C₁₂Linear alkyl of (2), L₉、L₁₀Each independently represents H or F, Z represents F or OCF₃，A₁₃、A₁₄Each independently represents:

specifically, the compound represented by the general formula VIII provided by the invention is selected from one or more of the formulas VIII-A to VIII-L:

wherein R is₁₃Represents C₁～C₈The linear alkyl group of (1); preferably C₂～C₅Linear alkyl group of (1).

In each embodiment of the present invention, taking any liquid crystal composition as an example (total mass is 100%), the content of the compound represented by general formula VIII is preferably 0% to 19%, more preferably 0% to 14% (more preferably 0% to 13%), and when the amount of addition is not 0, suitable addition ranges include, for example, 1% to 19%, 3% to 13%, 5% to 18%, 1% to 14%, and the like.

In each embodiment of the present invention, taking any one of the liquid crystal compositions as an example (total mass is 100%), the total content of the compounds represented by the general formulae V to VIII is preferably 0% to 80%, and when the amount of addition is not 0, suitable addition ranges include, for example, 1% to 60%, 3% to 55%, 3% to 37%, 3% to 47%, 3% to 55%, 4% to 35%, 14% to 55%, 3% to 41%, 3% to 14%, 3% to 25%, and the like.

In terms of overall formula, the liquid crystal composition provided by the invention comprises the following components in percentage by weight:

1) 1-60% of one or more compounds represented by the general formula (I);

2) 1-60% of one or more compounds represented by the general formula (II);

3) 0 to 80 percent of one or more compounds represented by a general formula (III);

4) 0 to 40 percent of one or more compounds represented by a general formula (IV);

5) and 0% to 80% of one or more compounds represented by general formulas (V) to (VIII).

Or the liquid crystal composition provided by the invention comprises the following components in percentage by weight:

1) 3.5 to 35 percent of one or more compounds represented by the general formula (I);

2) 5 to 39 percent of one or more compounds represented by a general formula (II);

3) 13 to 60.5 percent of one or more compounds represented by a general formula (III);

4) 0 to 25.5 percent of one or more compounds represented by a general formula (IV);

5) 0 to 42 percent of one or more compounds represented by a general formula (V);

6) 0 to 13 percent of one or more compounds represented by a general formula (VI);

7) 0 to 15 percent of one or more compounds represented by a general formula (VII)

8) And 0-19% of one or more compounds represented by the general formula (VIII).

Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by weight:

1) 1 to 12 percent of one or more compounds represented by a general formula (I);

2) 2 to 50 percent of one or more compounds represented by a general formula (II);

3) 10 to 70 percent of one or more compounds represented by a general formula (III);

4) 0 to 30 percent of one or more compounds represented by a general formula (IV);

5) and 1 to 60 percent of one or more compounds represented by general formulas (V) to (VIII).

Or:

1) 13 to 40 percent of one or more compounds represented by the general formula (I);

2) 5 to 40 percent of one or more compounds represented by a general formula (II);

3) 10 to 50 percent of one or more compounds represented by a general formula (III);

4) 10 to 30 percent of one or more compounds represented by a general formula (IV);

5) and 1 to 40 percent of one or more compounds represented by general formulas (V) to (VIII).

More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by weight:

1) 3.5 to 12 percent of one or more compounds represented by the general formula (I);

3) 17 to 60.5 percent of one or more compounds represented by a general formula (III);

5) and 4-55% of one or more compounds represented by general formulas (V) to (VIII).

Or:

1) 13 to 35 percent of one or more compounds represented by the general formula (I);

2) 10 to 30 percent of one or more compounds represented by a general formula (II);

3) 13 to 41 percent of one or more compounds represented by a general formula (III);

4) 12 to 24 percent of one or more compounds represented by a general formula (IV);

5) 0 to 22 percent of one or more compounds represented by a general formula (V);

5) 3 to 15 percent of one or more compounds represented by a general formula (VII) and/or a general formula (VIII).

1) 2 to 40 percent of one or more compounds represented by the general formula (I);

2) 3 to 19.5 percent of one or more compounds represented by a general formula (II);

3) 10 to 65 percent of one or more compounds represented by a general formula (III);

Or:

1) 2 to 30 percent of one or more compounds represented by the general formula (I);

2) 20 to 45 percent of one or more compounds represented by a general formula (II);

3) 15 to 55 percent of one or more compounds represented by a general formula (III);

5) and 1 to 55 percent of one or more compounds represented by general formulas (V) to (VIII).

2) 5 to 19.5 percent of one or more compounds represented by a general formula (II);

5) and 3-55% of one or more compounds represented by general formulas (V) to (VIII).

Or:

1) 4 to 24 percent of one or more compounds represented by the general formula (I);

2) 20 to 39 percent of one or more compounds represented by a general formula (II);

3) 19 to 48 percent of one or more compounds represented by a general formula (III);

4) 0 to 25 percent of one or more compounds represented by a general formula (IV);

5) and 3 to 47 percent of one or more compounds represented by general formulas (V) to (VIII).

2) 3 to 45 percent of one or more compounds represented by a general formula (II);

3) 10 to 40 percent of one or more compounds represented by a general formula (III);

Or:

1) 3 to 35 percent of one or more compounds represented by the general formula (I);

3) 41 to 70 percent of one or more compounds represented by a general formula (III);

5) and 3 to 40 percent of one or more compounds represented by general formulas (V) to (VIII).

3) 13 to 40 percent of one or more compounds represented by a general formula (III);

Or:

1) 4 to 30 percent of one or more compounds represented by the general formula (I);

2) 5 to 38 percent of one or more compounds represented by a general formula (II);

3) 41 to 60.5 percent of one or more compounds represented by a general formula (III);

4) 0 to 24 percent of one or more compounds represented by a general formula (IV);

5) and 4-35% of one or more compounds represented by general formulas (V) to (VIII).

4) 1 to 30 percent of one or more compounds represented by a general formula (IV);

5) and 1 to 45 percent of one or more compounds represented by general formulas (V) to (VIII).

Or:

1) 3 to 15 percent of one or more compounds represented by the general formula (I);

2) 2 to 45 percent of one or more compounds represented by a general formula (II);

4) 10 to 60 percent of one or more compounds represented by general formulas (V) to (VIII).

4) 2 to 25.5 percent of one or more compounds represented by a general formula (IV);

5) and 3 to 41 percent of one or more compounds represented by general formulas (V) to (VIII).

Or:

1) 5 to 12 percent of one or more compounds represented by the general formula (I);

3) 17 to 60 percent of one or more compounds represented by a general formula (III);

4) 14 to 55 percent of one or more compounds represented by general formulas (V) to (VIII).

Most preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by weight:

2) 8.5 to 30 percent of one or more compounds represented by a general formula (II);

3) 35 to 60.5 percent of one or more compounds represented by a general formula (III);

4) 13 to 25.5 percent of one or more compounds represented by a general formula (IV);

5) 3 to 14 percent of one or more compounds represented by the general formula (VI) and/or the general formula (VII).

5) 1 to 45 percent of one or more compounds represented by a general formula (V);

5) and 0% to 25% of one or more compounds represented by general formulas (VI) to (VIII).

Or:

1) 3 to 30 percent of one or more compounds represented by the general formula (I);

3) 30 to 70 percent of one or more compounds represented by a general formula (III);

5) and 2 to 30 percent of one or more compounds represented by general formulas (VI) to (VIII).

3) 13 to 48 percent of one or more compounds represented by a general formula (III);

5) 2 to 42 percent of one or more compounds represented by a general formula (V);

5) and 0% to 21% of one or more compounds represented by general formulas (VI) to (VIII).

Or:

5) and 3 to 25 percent of one or more compounds represented by general formulas (VI) to (VIII).

In addition, in the liquid crystal composition (each formula), the sum of the mass percentages of the components is 100%.

In the liquid crystal composition provided by the invention, the compound represented by the general formula I has negative dielectric anisotropy (-Delta), so that the liquid crystal composition has a large vertical dielectric constant (_⊥) There may be provided the following means for increasing the vertical dielectric constant of the liquid crystal composition.

The II-type structural compound provided by the invention has the advantages of large positive dielectric anisotropy (+ delta) and excellent intersolubility, and is very effective in improving the dielectric anisotropy of the liquid crystal composition.

The two-ring structure compound represented by the III-type general formula provided by the invention is a nonpolar component. The compound has obvious effects of reducing the viscosity of a system and improving the response speed, and is an essential compound for preparing a liquid crystal mixture with quick response.

The compound represented by the IV general formula provided by the invention is a tricyclic non-polar structure and has a large elastic constant (K)₁₁、K₂₂、K₃₃) And low rotational viscosity, which has a significant effect on increasing the elastic constant of the liquid crystal composition.

The compound represented by the V-type general formula provided by the invention is of a tricyclic polar structure, has higher polarity and good intersolubility, and is beneficial to improving the problem of intermiscibility between the I type with strong polarity and a nonpolar monomer.

The compound represented by the VI general formula provided by the invention is of a terphenyl structure, has large optical anisotropy, and can effectively improve the optical anisotropy of the liquid crystal composition.

The compound represented by the VII general formula provided by the invention is of a tetracyclic structure, has large optical anisotropy and high clearing point performance, and has obvious effects on improving the clearing point and the optical anisotropy of the composition.

The compound represented by the VIII general formula provided by the invention is tetracyclic in polarity, has relatively high polarity and high clearing point, and has a remarkable effect of improving the clearing point of the liquid crystal composition.

The adding of negative dielectric anisotropy components to the positive dielectric anisotropy liquid crystal composition is the earliest seen in Chinese patent CN103320142, the compound of the invention provides the compound of the I class, which is a compound containing 2-methyl-3, 4, 5-trifluorophenyl and difluoromethoxy (-CF2O-), the compound of the structure has large dielectric anisotropy, the two-position methyl of the compound is an electron-repelling group, the dielectric anisotropy of the compound can be effectively increased, wherein the I-C class single crystal is a liquid crystal compound containing a dioxyheterocyclic ring, the structure has large vertical dielectric, and the method is one of methods for improving the vertical dielectric 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 invention also provides the application of the liquid crystal composition in a liquid crystal display device, and the liquid crystal composition has the characteristics of low viscosity, high resistivity, good low-temperature intersolubility, high response speed and excellent transmittance, and can be used for fast-response liquid crystal display in various display modes. Currently, FFS and IPS are the most mainstream display modes, but the problem of low transmittance of FFS and IPS becomes a key problem to be solved; device manufacturers generally achieve the brightness improvement method by improving the backlight brightness, but the power consumption caused by the method is obviously increased; it has been found through experiments that a liquid crystal composition having a large vertical dielectric has a high transmittance, and thus can achieve the problem of improving luminance without increasing power consumption. The liquid crystal composition provided by the invention has large vertical dielectric, and can effectively improve the transmittance characteristic of a liquid crystal display, particularly in displays of FFS and IPS display modes.

Drawings

FIG. 1 is a graph comparing the transmittance characteristics of example 7 and comparative example 1;

fig. 2 is a graph comparing the transmittance characteristics of example 62 and comparative example 2.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

All liquid crystal compounds used in the present invention are known compounds, are available from billions of spatio-temporal sources, and are also commercially available from other sources.

The liquid crystal composition in the embodiment of the invention is prepared by the following method:

the preparation of the uniform liquid crystal adopts a thermal dissolving method commonly used in the industry, firstly, the liquid crystal compound is weighed by a balance according to the weight percentage, wherein the weighing and adding sequence has no specific requirement, the melting point of the liquid crystal compound is generally weighed and mixed in sequence from high to low, the heating and stirring are carried out at 60-100 ℃ to ensure that all components are uniformly dissolved, and then, the target sample is obtained after filtering, rotary evaporation and packaging.

Unless otherwise indicated, percentages in the context are percentages by weight and all temperatures are given in degrees celsius. The following abbreviations are used:

Δ n is optical anisotropy (25 ℃), Δ is dielectric anisotropy (25 ℃, 1000Hz),_⊥is a vertical dielectric (25 ℃, 1000Hz), Cp is the clearing point (DEG C) of the liquid crystal composition, gamma 1 is the rotational viscosity (25 ℃, mpa.s), K₁₁、K₂₂、K₃₃Respectively, splay, twist, and bend elastic constants (25 ℃, pN).

For convenience of representation, in the following examples, the group structures in the liquid crystal compounds are represented by the codes shown in the following table:

take the following structure as an example:

the structure is represented by the code listed in the table above, which is 3 APUQKF.

The structure is as follows:

the structure is represented by the codes listed in the table above, which is 4SGIWO 1.

The structure is as follows:

the structure is represented by the code listed in the table above, and is denoted VYPWO 1.

Example 1:

the following liquid crystal compounds are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in Table 1:

TABLE 1 weight percents of the components and performance parameters of the liquid crystal composition of example 1

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SCWO2	10	△n	0.104
II	3DUQKF	15	Δε	+8.8
					II	2DPUQKF	6	ε⊥	5.0
II	3DPUQKF	6	γ1	70
					III	3CCV	42	Cp	80
IV	VCCP1	9	K11	10.8
					VIII	3CPGUOCF3	10	K22	5.4
VIII	3PPGUF	2	K33	13.2

Example 2

The following liquid crystal compounds are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in Table 2:

TABLE 2 weight percents of the components and performance parameters of the liquid crystal composition of example 2

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SCWO2	6	△n	0.101
II	3CDUQKF	13	Δε	+12.0
					II	3PUQKF	10	ε_⊥	6.0
II	2APUQKF	10	γ1	90
					II	3APUQKF	5	Cp	89
III	3CCV	42	K₁₁	11.8
					VIII	2CCPUF	5	K₂₂	5.9
VIII	3CCPUF	5	K₃₃	15.5
					VIII	4CCPUF		4

Example 3

The following liquid crystal compounds are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in Table 3:

TABLE 3 weight percents of the components and Performance parameters of the liquid crystal composition of example 3

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3CSWO2	5	△n	0.103
I	2CYW1	5	Δε	+11.0
					II	3CCQKF	13	ε_⊥	5.5
II	3PUQKF	12	γ1	116
					II	3APUQKF	14	Cp	90
III	3CCV	24	K₁₁	12.6
					IV	VCCP1	9	K₂₂	6.3
V	3CCUF	10	K₃₃	15.6
					VIII	2CCPUF	4
VIII	3CCPUF		4

Example 4

The following liquid crystal compounds are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in Table 4:

TABLE 4 weight percents of the components and Performance parameters of the liquid crystal composition of example 4

Example 5

The following liquid crystal compounds are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in Table 5:

TABLE 5 weight percents of the components and Performance parameters of the liquid crystal composition of example 5

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2CYW1	9	△n	0.102
II	3CCQKF	19	Δε	+9.0
					III	5CCV	13	ε_⊥	5.1
III	3CCV1		4	Cp						101
					V	2CCUF		8	γ1		112
V	3CCUF	8	K₁₁	13.6
					V	3CPUF	23	K₂₂	6.8
VIII	2CCPUF	4	K₃₃	17.5
					VIII	3CCPUF	4
VIII	4CCPUF		4
					VIII	5CCPUF		4

Example 6

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 6:

TABLE 6 weight percents of the components and Performance parameters of the liquid crystal composition of example 6

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SCW1	10	△n	0.093
II	3PUQKF	5	Δε	+3.0
					III	3CCV	40	ε_⊥	3.8
III	5CCV	10	Cp	85
					III	2CC3	10	γ1	55
VII	4CPGP3	5	K₁₁	14.4
					VII	5CPGP2	5	K₂₂	7.2
VII	5CPGP3	5	K₃₃	16.4
					VIII	3DPGUF		10

Example 7

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 7:

TABLE 7 weight percents of the components and Performance parameters of the liquid crystal composition of example 7

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SCWO2	4	△n	0.099
II	3PGUQKF	8.5	Δε	+2.6
					III	3CCV	40	ε_⊥	2.8
III	3CCV1	10	Cp	83
					III	5CCV1	5.5	γ1	54
III	5PP1	5	K₁₁	13.8
					IV	VCCP1	12.5	K₂₂	6.9
IV	V2CCP1	5	K₃₃	16.4
					VI	2PGPF	6.5
VI	3PGPF	3

Example 8

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 8:

TABLE 8 weight percents of the components and Performance parameters of the liquid crystal composition of example 8

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2SWY3	10	△n	0.100
II	3APUQKF	10	Δε	+7.5
					II	3PUQKF	12	ε_⊥	4.4
III	3CCV	45	Cp	75
					V	3CCUF		10	γ1	60
VI	2PGP5	4	K₁₁	10.8
					VIII	2CCPUF	3	K₂₂	5.4
VIII	3CCPUF	3	K₃₃	12.4
					VIII	4CCPUF	3

Example 9

The following liquid crystal compounds are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in Table 9:

TABLE 9 weight percents of the components and performance parameters of the liquid crystal composition of example 9

Example 10

The following liquid crystal compounds are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in Table 10:

TABLE 10 weight percents of the components and performance parameters of the liquid crystal composition of example 10

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2SCWO2	6	△n	0.102
II	3PUQKF	5	Δε	+8.5
					II	3CCQKF	15	ε_⊥	5.1
II	2APUQKF	5	Cp	101
					II	3DPUQKF	9	γ1	100
III	3CCV	34	K₁₁	13.6
					III	3CCV1	2	K₂₂	6.8
IV	VCCP1	2	K₃₃	18.5
					V	3CCUF		10
VII	3CPPC3	4
					VIII	3CCPUF		4
VIII	3CPGUOCF	₃	4

Example 11

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 11:

TABLE 11 weight percents of the components and performance parameters of the liquid crystal composition of example 11

The composition provided by the embodiment has fast response time, particularly shows a low-temperature state, and is suitable for a fast-response liquid crystal display device.

Example 12

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 12:

TABLE 12 weight percents of the components and Performance parameters of the liquid crystal composition of example 12

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3CYWO2	8	△n	0.097
II	2APUQKF	5	Δε	+11.5
					II	3APUQKF	8	ε_⊥	6.2
II	3DCQKF	13	Cp	91
					III	3CCV	19	γ1	129
V	VCCGF	10	K₁₁	12.6
					V	2CCUF	5	K₂₂	6.3
V	3CCUF	10	K₃₃	16.3
					V	5CCUF	5
V	3CPGF	5
					V	5CPUF	2
V	3CGUF	5
					VIII	3CCPUF	5

Example 13

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 13:

TABLE 13 weight percents of the components and Performance parameters of the liquid crystal composition of example 13

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2SCWO2	13	△n	0.105
II	3CCQKF	15	Δε	+8.6
					II	3PUQKF	15	ε_⊥	5.2
III	3CCV	24	Cp	100
					IV	V2CCP1		10	γ1	114
V	3CPUF	10	K₁₁	12.6
					VIII	2CCPUF	4	K₂₂	6.3
VIII	3CCPUF	5	K₃₃	16.3
					VIII	4CCPUF		4

Example 14

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 14:

TABLE 14 weight percents of the components and performance parameters of the liquid crystal composition of example 14

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2CYW1	6	△n	0.103
II	3PUQKF	8	Δε	+6.5
					III	3CCV	27	ε_⊥	4.6
III	3CCV1	5	Cp	90
					IV	VCCP1	13	γ1	66
IV	V2CCP1	11	K₁₁	12.2
					V	3CCUF	4	K₂₂	6.1
V	3CPUF	9	K₃₃	16.6
					V	3CGUF	7
V	2PGUF	3
					VIII	3CCPUF	7

Example 15

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 15:

TABLE 15 weight percents of the components and Performance parameters of the liquid crystal composition of example 15

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2CCWO2	5	△n	0.101
II	3PUQKF	15	Δε	+6.5
					III	3CCV	36	ε_⊥	4.3
IV	VCCP1		10	Cp						90
					IV	V2CCP1		10	γ1		64
V	3CPUF	10	K₁₁	12.2
					VIII	2CCPUF	4	K₂₂	6.1
VIII	3CCPUF	4	K₃₃	16.6
					VIII	4CCPUF	4
VIII	5CCPUF		2

Example 16

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 16:

TABLE 16 weight percents of the components and Performance parameters of the liquid crystal composition of example 16

Example 17

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 17:

TABLE 17 weight percents of the components and Performance parameters of the liquid crystal composition of example 17

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SPWO2	4.5	△n	0.100
II	3PUQKF	12	Δε	+6.0
					II	2APUQKF	5.5	ε_⊥	3.5
III	3CCV	42	Cp	93
					III	1PP2V	3	γ1	72
IV	3CPP2	4	K₁₁	12.5
					V	2CCGF	10	K₂₂	6.3
VIII	2CCPGF	5	K₃₃	16.4
					VIII	3CCPGF	5
VIII	4CCPGF	5
					VIII	5CCPGF		4

Example 18

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 18:

TABLE 18 weight percents of the components and Performance parameters of the liquid crystal composition of example 18

Example 19

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 19:

TABLE 19 weight percents of the components and Performance parameters for the liquid crystal composition of example 19

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SCWO1	6	△n	0.104
II	3DUQKF	7	Δε	6.2
					II	4DUQKF	7.5	ε_⊥	3.9
II	4DPUQKF	2	Cp	95
					III	3CCV	38.5	γ1	72
III	1PP2V	7	K₁₁	13.2
					IV	VCCP3	9	K₂₂	6.6
V	3CCGF	4	K₃₃	16.7
					VIII	2CCPGF	5
VIII	3CCPGF	5
					VIII	4CCPGF	5
VIII	5CCPGF		4

Example 20

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 20:

TABLE 20 weight percents of the components and Performance parameters of the liquid crystal composition of example 20

Example 21

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 21:

TABLE 21 weight percents of the components and Performance parameters of the liquid crystal composition of example 21

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3CYWO2	6	△n	0.107
II	3PUQKF	12	Δε	6.5
					II	2APUQKF	4	ε_⊥	3.6
II	3APUQKF	4	Cp	85
					III	3CCV	33	γ1	67
III	3CCV1	8	K₁₁	12.7
					III	1PP2V1	5	K₂₂	6.4
IV	VCCP1	17	K₃₃	16.4
					IV	V2CCP1	7
VI	3PGP2V	3
					VIII	3PPGUF	1

Example 22

The following liquid crystal compounds are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in Table 22:

TABLE 22 weight percents of the components and Performance parameters of the liquid crystal composition of example 22

Example 23

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 23:

TABLE 23 weight percents of the components and Performance parameters of the liquid crystal composition of example 23

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2YPWO1	5	△n	0.101
II	3PGUQKF	6	Δε	+5.3
					II	3PUQKF	10	ε_⊥	3.7
II	4DPUQKF	3	Cp	92
					III	3CCV	40	γ1	65
III	3CCV1	5	K₁₁	13.6
					IV	VCCP1	6	K₂₂	6.8
IV	3CPP2	4	K₃₃	17.5
					IV	3CCP1	6
V	3CCPOCF3	6
					V	5CCPOCF3		4
VI	2PGPF	5

Example 24

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 24:

TABLE 24 weight percents of the components and performance parameters of the liquid crystal composition of example 24

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2CSWO1	4.5	△n	0.103
II	3PUQKF	10.5	Δε	+6.3
					II	2APUQKF	8	ε_⊥	3.6
II	3APUQKF	7	Cp	93
					III	3CCV	45	γ1	68
IV	3CCP1	5	K₁₁	13.4
					IV	3CPP2	5	K₂₂	6.7
IV	VCCP1	10	K₃₃	16.3
					VII	3CPPC3	5

Example 25

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 25:

TABLE 25 weight percents of the components and Performance parameters of the liquid crystal composition of example 25

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2SCWO1	5	△n	0.103
II	3PUQKF	10	Δε	+6.4
					II	2APUQKF	6	ε_⊥	3.5
II	3APUQKF	6	Cp	93
					II	4DPUQKF	3	γ1	68
III	3CCV	45	K₁₁	13.8
					IV	3CCP1	5	K₂₂	6.9
IV	3CPP2	5	K₃₃	16.6
					IV	VCCP1		10
VII	3CPPC3	5

Example 26

The following liquid crystal compounds in percentage by weight are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in a table 26:

TABLE 26 weight percents of the components and Performance parameters for the liquid crystal composition of example 26

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2SCW1	8	△n	0.102
II	3PUQKF	12	Δε	+7.0
					II	2APUQKF	5	ε_⊥	4.2
III	5PP1	3	Cp	93
					III	3CCV	34	γ1	90
V	3CPGF	10	K₁₁	12.0
					V	3CCGF	10	K₂₂	6.0
VIII	2CCPGF	5	K₃₃	15.5
					VIII	3CCPGF	4
VIII	4CCPGF	5
					VIII	5CCPGF		4

Example 27

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 27:

TABLE 27 weight percents of the components and Performance parameters for the liquid crystal composition of example 27

Example 28

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 28:

TABLE 28 weight percents of the components and Performance parameters of the liquid crystal composition of example 28

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3YCW1	8	△n	0.102
II	3PUQKF	11	Δε	+6.3
					II	2APUQKF	5	ε_⊥	3.8
III	3CCV	34	Cp	98
					IV	3CPP2	5	γ1	84
IV	3CCP1	4	K₁₁	13.5
					V	3CPGF	9	K₂₂	6.8
V	3CCGF	12	K₃₃	16.4
					VII	3CPPC3	5
VIII	3CCPGF	3
					VIII	4CCPGF		4

Example 29

The following liquid crystal compounds are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in a table 29:

TABLE 29 weight percents of ingredients and Performance parameters for the liquid crystal composition of example 29

Example 30

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 30:

TABLE 30 weight percents of the components and Performance parameters of the liquid crystal composition of example 30

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3CYWO3	5	△n	0.099
II	3PUQKF	12	Δε	+7.5
					II	2APUQKF	8	ε_⊥	3.8
II	3PGUQKF	3	Cp	95
					III	3CCV	36	γ1	78
III	3CCV1	5	K₁₁	13.0
					IV	3CPP2	4	K₂₂	6.5
V	3CCGF	7	K₃₃	16.4
					V	3CCPOCF	₃	6
VIII	2CCPGF		4
					VIII	3CCPGF	5
VIII	4CCPGF	5

Example 31

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 31:

TABLE 31 weight percents of the components and Performance parameters for the liquid crystal composition of example 31

Example 32

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 32:

TABLE 32 weight percents of the components and Performance parameters of the liquid crystal composition of example 32

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SPWO2	2	△n	0.100
I	3SWO2	2	Δε	7.7
					II	3PUQKF	10	ε_⊥	3.7
II	2APUQKF	8	Cp	92
					II	3APUQKF	7	γ1	79
II	4DUQKF	2	K₁₁	13.4
					II	4DPUQKF	3	K₂₂	6.7
III	3CCV	41	K₃₃	15.8
					IV	3CCP1		6
IV	VCCP1	11
					VII	3CPPC3	5
VII	3CGPC3	3

Example 33

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 33:

TABLE 33 weight percents of the components and Performance parameters of the liquid crystal composition of example 33

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SCWO1	6	△n	0.103
II	2APUQKF	8	Δε	7.7
					II	3APUQKF	7	ε_⊥	3.7
II	4DUQKF	2	Cp	93
					II	4DPUQKF	3	γ1	75
II	3PUQKF	10	K₁₁	13.6
					III	3CCV	41	K₂₂	6.8
IV	VCCP1	10	K₃₃	15.9
					IV	3CPP2		8
VII	3CPPC3	5

Example 34

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 34:

TABLE 34 weight percents of the components and Performance parameters of the liquid crystal composition of example 34

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3YPW1	5	△n	0.111
II	3PUQKF	12	Δε	7.5
					II	2PGUQKF	2.5	ε_⊥	4.0
II	3PGUQKF	8	Cp	75
					III	3CCV	42	γ1	62
III	5PP1	6	K₁₁	11.0
					V	3CCGF	5.5	K₂₂	5.5
VI	2PGPF	4	K₃₃	12.4
					VI	3PGPF	4
VIII	2CCPGF	3
					VIII	3CCPGF		4
VIII	4CCPGF		4

Example 35

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 35:

TABLE 35 weight percents of the components and Performance parameters of the liquid crystal composition of example 35

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2YGIWO1	6	△n	0.110
II	3PUQKF	12	Δε	5.0
					III	3CCV	41	ε_⊥	3.8
III	5PP1	7	Cp	78
					IV	3CPP2		6	γ1	55
V	3CPGF	7	K₁₁	12.2
					V	3CCGF	4	K₂₂	6.1
VI	2PGPF	7	K₃₃	12.7
					VIII	2CCPGF	3
VIII	3CCPGF	3
					VIII	4CCPGF		4

Example 36

The following liquid crystal compounds in percentage by weight are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in Table 36:

TABLE 36 weight percents of the components and Performance parameters of the liquid crystal composition of example 36

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2YCW1	6	△n	0.109
II	3PUQKF	10	Δε	6.4
					II	3DUQKF	5	ε_⊥	3.6
III	3CCV	36	Cp	92
					IV	VCCP1	13	γ1	77
IV	V2CCP1	6	K₁₁	13.4
					V	3DPUF	10	K₂₂	6.7
VIII	2CCPUF	4	K₃₃	17.1
					VIII	3CCPUF	4
VIII	5CPGP3		6

Example 37

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 37:

TABLE 37 weight percents of the components and Performance parameters of the liquid crystal composition of example 37

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SCWO2	5	△n	0.103
I	2SCW1	5	Δε	+11.0
					II	3APUQKF	14	ε_⊥	5.9
II	3CCQKF	13	γ1	120
					II	3PUQKF	12	Cp	83
III	3CCV	24	K₁₁	12.6
					IV	VCCP1	9	K₂₂	6.3
V	3DGUF	10	K₃₃	15.6
					VIII	2CCPUF	4
VIII	3CCPUF		4

Example 38

The following liquid crystal compounds in percentage by weight are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in Table 38:

TABLE 38 weight percents of the components and Performance parameters of the liquid crystal composition of example 38

Example 39

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 39:

TABLE 39 weight percents of the components and Performance parameters of the liquid crystal composition of example 39

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2SCWO2	7	△n	0.103
II	2APUQKF	6	Δε	+5.6
					II	4DPUQKF	3	ε_⊥	3.6
II	4DUQKF	2	γ1	70
					II	3PUQKF	11.5	Cp	92
III	3CCV	41.5	K₁₁	13.8
					IV	3CPP1	5	K₂₂	6.9
IV	3CPP2	7	K₃₃	17.5
					IV	VCCP1	12
VII	3CPPC3	5

Example 40

The following liquid crystal compounds in percentage by weight are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in a table 40:

TABLE 40 weight percents of the components and Performance parameters of the liquid crystal composition of example 40

EXAMPLE 41

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 41:

TABLE 41 weight percents of components and performance parameters for the liquid crystal composition of example 41

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SCWO2	5	△n	0.111
II	2APUQKF	6	Δε	+6.0
					II	4DPUQKF	3	ε_⊥	3.8
II	3PUQKF	12.5	γ1	58
					III	3CCV	42	Cp	80
III	5PP1	5	K₁₁	12.4
					IV	3CPP2	5	K₂₂	6.2
IV	3CCP1	3.5	K₃₃	13.5
					VI	2PGPF	6
VI	3PGPF		6
					VII	3CPPC3	4
VIII	3CCPGF		2

Example 42

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 42:

TABLE 42 weight percents of the components and Performance parameters of the liquid crystal composition of example 42

Example 43

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 43:

TABLE 43 weight percents of components and performance parameters of liquid crystal composition of example 43

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SPWO2	8	△n	0.115
II	3PUQKF	12	Δε	+6.4
					II	4DPUQKF	3	ε_⊥	4.4
II	3PGUQKF	4.5	γ1	65
					III	3CCV	39	Cp	89
III	5PP1	5	K₁₁	12.8
					IV	3CPP1	5	K₂₂	6.4
IV	3CCP2	6.5	K₃₃	13.8
					V	3CPGF		10
VIII	2CCPGF	3
					VIII	3CCPGF		4

Example 44

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 44:

TABLE 44 weight percents of the components and Performance parameters of the liquid crystal composition of example 44

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3CSWO3	4.5	△n	0.119
II	2APUQKF	7	Δε	+6.3
					II	4DPUQKF	3	ε_⊥	4.1
II	3PUQKF	12.5	γ1	64
					III	3CCV	39	Cp	85
III	5PP1	6	K₁₁	12.5
					IV	3CPP2	7	K₂₂	6.3
VI	2PGPF	7	K₃₃	13.7
					VI	3PGPF	6
VII	3CPPC3	5
					VIII	3CCPGF	3

Example 45

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 45:

TABLE 45 weight percents of the components and Performance parameters of the liquid crystal composition of example 45

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2SCWO1	6	△n	0.1110
II	3PUQKF	10	Δε	+7.5
					II	2APUQKF	6	ε_⊥	3.7
II	2PGUQKF	4	γ1	84
					II	4DPUQKF	2	Cp	105
II	3PGUQKF	4	K₁₁	14.4
					III	3CCV	40	K₂₂	7.2
III	3CCV1	5	K₃₃	16.8
					IV	3CPP2	5
VII	3CPPC3	5
					VIII	3CCPGF		4
VIII	4CCPGF	5
					VIII	2CCPGF		4

Example 46

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 46:

TABLE 46 weight percents of the components and Performance parameters of the liquid crystal composition of example 46

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	V2YWO2	5	△n	0.106
II	3PUQKF	3	Δε	+5.7
					II	2APUQKF	6	ε_⊥	3.4
II	2PGUQKF	4	γ1	75
					II	4DPUQKF	2	Cp	102
II	3PGUQKF	5	K₁₁	14.6
					III	3CCV	40	K₂₂	7.3
III	3CCV1	6	K₃₃	17.1
					IV	VCCP1	9
IV	3CPP2	5
					VII	3CPPC3	5
VIII	2CCPGF	3
					VIII	3CCPGF	3
VIII	4CCPGF		4

Example 47

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 47:

TABLE 47 weight percents of the components and Performance parameters of the liquid crystal composition of example 47

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3CYW1	6	△n	0.086
II	4DUQKF	5	Δε	+5.3
					II	2APUQKF	4	ε_⊥	3.5
II	4DPUQKF	3	γ1	67
					II	3PUQKF	8	Cp	90
III	3CCV	38	K₁₁	13.4
					III	3CC2	4	K₂₂	6.7
IV	VCCP1	11	K₃₃	16.7
					IV	V2CCP1		6
IV	3CCP1	7
					V	3CCGF		4
VII	3CPPC3	4

Example 48

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 48:

TABLE 48 weight percents of the components and Performance parameters of the liquid crystal composition of example 48

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SWO2	3.5	△n	0.091
II	2APUQKF	4	Δε	+5.3
					II	4DPUQKF	3	ε_⊥	3.4
II	4DUQKF	3.5	γ1	71
					II	3PUQKF	9	Cp	90
III	3CCV	38	K₁₁	13.2
					IV	VCCP1	10	K₂₂	6.6
IV	V2CCP1	7	K₃₃	17.2
					IV	3CCP1	7
V	3CPGF	4
					V	3CCPOCF	₃	6
VII	3CPPC3	5

Example 49

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 49:

TABLE 49 weight percents of the components and Performance parameters of the liquid crystal composition of example 49

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3YCWO1	6	△n	0.097
II	4DUQKF	4	Δε	+5.4
					II	2APUQKF	4	ε_⊥	3.8
II	4DPUQKF	3	γ1	74
					II	3PUQKF	9	Cp	93
III	3CCV	30	K₁₁	13.7
					III	5PP1	5	K₂₂	6.9
III	3CPO1	3	K₃₃	16.9
					III	3CC2	4
IV	VCCP1	11
					IV	V2CCP1		6
IV	3CCP1	7
					VII	3CPPC3	4
VIII	3CCPGF		4

Example 50

The following liquid crystal compounds are taken and prepared into the liquid crystal composition by the method of the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in a table 50:

TABLE 50 weight percents of the components and Performance parameters of the liquid crystal composition of example 50

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3YWO4	4	△n	0.106
II	4DUQKF	4	Δε	+5.8
					II	3PGUQKF	4	ε_⊥	3.5
II	4DPUQKF	3	γ1	72
					II	3PUQKF	9.5	Cp	91
III	3CCV	26.5	K₁₁	14.2
					III	3CCV1	5	K₂₂	7.1
III	5PP1	7	K₃₃	16.4
					IV	VCCP1		10
IV	3CCP1		6
					IV	3CPP2	7
V	3CCPOCF	₃	6
					VII	3CPPC3	4
VIII	3CCPGF		4

Example 51

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 51:

TABLE 51 weight percents of the components and Performance parameters of the liquid crystal composition of example 51

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2YPWO1	4	△n	0.112
II	4DUQKF	3	Δε	+5.6
					II	3PGUQKF	5	ε_⊥	3.4
II	4DPUQKF	3	γ1	74
					II	3PUQKF	9	Cp	92
III	3CCV	31	K₁₁	14.0
					III	5PP1	7	K₂₂	7.0
III	3CPO1	4	K₃₃	16.1
					IV	VCCP1	11
IV	3CCP1		6
					IV	3CPP2	7
VII	3CPPC3	5
					VIII	3CCPGF	5

Example 52

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 52:

TABLE 52 weight percents of the components and Performance parameters of the liquid crystal composition of example 52

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2SGIWO2	5.5	△n	0.113
II	3PGUQKG	4.5	Δε	5.7
					II	4DPUQKF	3	ε_⊥	3.7
II	3PUQKF	12	γ1	70
					III	3CCV	33	Cp	95
III	5PP1	7	K₁₁	14.4
					IV	VCCP1	9	K₂₂	7.2
IV	3CPP2	8	K₃₃	16.1
					IV	3CCP1	5
V	3CCPOCF₃	5
					VII	3CPPC3	4
VIII	3CCPGF		4

Example 53

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 53:

TABLE 53 weight percent of the components and Performance parameters of the liquid crystal composition of example 53

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3CSW1	6	△n	0.123
II	3PGUQKG	4.5	Δε	5.5
					II	4DPUQKF	3	ε_⊥	3.5
II	3PUQKF	10	γ1	71
					III	3CCV	30	Cp	91
III	5PP1	7	K₁₁	14.2
					IV	VCCP1	12	K₂₂	7.1
IV	V2CCP1	6	K₃₃	15.7
					IV	3CPP2	2.5
IV	3CCP1	5
					VI	2PGPF	5
VI	3PGPF	5
					VII	3CPPC3	4

Example 54

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 54:

TABLE 54 weight percents of the components and Performance parameters of the liquid crystal composition of example 54

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3SCWO2	5	△n	0.127
II	3PGUQKG	5	Δε	5.4
					II	4DPUQKF	3	ε_⊥	3.7
II	3PUQKF	10	γ1	73
					III	3CCV	30	Cp	95
III	5PP1	7	K₁₁	13.8
					IV	VCCP1	12	K₂₂	6.9
IV	3CPP2	7	K₃₃	16.3
					V	3CPGF	5
VI	2PGPF		6
					VI	3PGPF	5
VII	3CPPC3	5

Example 55

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 55:

TABLE 55 weight percents of the components and Performance parameters of the liquid crystal composition of example 55

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2SPWO2	7	△n	0.110
I	2SPW1	8	Δε	+4.0
					I	3YWO2	5	ε_⊥	5.3
I	3SWO2	5	γ1	72
					I	2CYWO1	10	Cp	85
II	3PUQKF	4.5	K₁₁	12.8
					II	4DUQKF	1.5	K₂₂	6.4
II	3PGUQKF	2.5	K₃₃	15.3
					II	4DPUQKF	1.5
III	3CCV	29
					III	5PP1	5
III	3CPO1		2
					IV	VCCP1	5.5
IV	3CCP1	3
					IV	3CPP2	3.5
V	3CPGF		2
					VII	3CPPC3	2
VIII	3CCPGF	3

Example 56

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 56:

TABLE 56 weight percents of components and Performance parameters of the liquid crystal composition of example 56

Example 57

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 57:

TABLE 57 weight percents of ingredients and Performance parameters for the liquid crystal composition of example 57

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2YGIWO2	6	△n	0.099
II	4DUQKF	5	Δε	+6.5
					III	3CCV	30	ε_⊥	4.6
III	2CCV1	5	γ1	72
					IV	VCCP1	13	Cp	86
IV	V2CCP1	11	K₁₁	12.6
					V	2PGUF	3	K₂₂	6.3
V	3DCUF	4	K₃₃	15.8
					V	3DPUF	9
V	3DGUF	7
					VIII	3CCPUF	7

Example 58

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 58:

TABLE 58 weight percents of the components and Performance parameters of the liquid crystal composition of example 58

Example 59

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 59:

TABLE 59 weight percents of the components and Performance parameters of the liquid crystal composition of example 59

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	3YPWO2	4	△n	0.101
I	5YWO2	3	Δε	3.8
					I	2CYWO2	4	ε_⊥	4.5
I	3YWO2	4	γ1	70
					II	3PUQKF	9	Cp	90
II	4DUQKF	1.5	K₁₁	13.6
					II	3APUQKF	4.5	K₂₂	6.8
II	4DPUQKF	3	K₃₃	15.6
					III	3CCV	35
III	1PP2V	5
					IV	VCCP1	9
IV	V2CCP1	4.5
					IV	3CPP2		6
IV	3CCP1	4.5
					VII	3CPPC3	3

Example 60

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 60:

TABLE 60 weight percents of the components and Performance parameters of the liquid crystal composition of example 60

Example 61

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 61:

TABLE 61 weight percents of the components and Performance parameters of the liquid crystal composition of example 61

Categories	Components	Weight percent (%)	Performance parameter	Parameter value
					I	2SPWO2	6	△n	0.105
I	3SPWO2	6	Δε	2.2
					II	3PGUQKF	4.7	ε_⊥	3.5
II	3PUQKF	4	γ1	55
					III	3CCV	40	Cp	75
III	3CCV1	12	K₁₁	12.5
					III	5PP1	6	K₂₂	6.3
IV	VCCP1	13	K₃₃	14.3
					VI	2PGPF	6.3
VI	3PGPF		2

Example 62

The following liquid crystal compounds in percentage by weight are taken and prepared into the liquid crystal composition by the method disclosed by the invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal composition are shown in a table 62:

TABLE 62 weight percents of the components and Performance parameters of the liquid crystal composition of example 62

Comparative example 1

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 63:

TABLE 63 weight percents of components and Performance parameters for the liquid Crystal composition of comparative example 1

Components	Weight percent (%)	Performance parameter	Parameter value
				3PGUQUF	6.5	△n	0.098
3APUQUF	5	Δε	+2.6
				3CCV	40	ε_⊥	2.6
3CCV1	12	γ1	52
				1V2PP1	7	Cp	80
VCCP1	13	K₁₁	13.6
				V2CCP1	12	K₂₂	6.8
2PGP3	4	K₃₃	16.2
				3PPGUF	0.5

Comparative example 7 with comparative example 1, the parameters are given in Table 64:

TABLE 64 Performance parameters of comparative example 1 and example 7

Item	Comparative example 1	Example 7
			△n	0.098	0.099
Δε	+2.6	+2.6
			ε⊥	2.6	2.8
Cp	80	83
			γ1	52	54
K₁₁	13.6	13.8
			K₂₂	6.8	6.9
K₃₃	16.2	16.4

It is known from comparison that the vertical dielectric constant of example 7 is improved by about 10% compared to that of comparative example 1, and the transmittance of the lcd is effectively improved by about 3%, and the optical data is shown in table 65:

TABLE 65 color coordinate and transmittance test results for comparative example 1 and example 7

Item	Comparative example 1	Example 7
			Color temperature	7901	7554
Brightness of light	24.18	24.99
			x	0.2947	0.2984
y	0.3105	0.3145

The transmittance characteristics are shown in FIG. 1.

Comparative example 2

The following liquid crystal compounds were taken and prepared into liquid crystal compositions by the method described in the present invention, and the specific mixture ratio and the performance parameters of the obtained liquid crystal compositions are shown in table 66:

TABLE 66 weight percents of components and performance parameters of the liquid crystal composition of comparative example 2

Components	Weight percent (%)	Performance parameter	Parameter value
				3PGUQUF
	8	△n	0.104
				3CCV	40	Δε	+2.6
3CCV1	12	ε_⊥	2.6
				1PP2V1	7	γ1	76
2PGPF	6	Cp	51
				3PGPF	4	K₁₁	13.6
VCCP1	10	K₂₂	6.8
				V2CCP1	10	K₃₃	16.2
3CPP2	3

Comparative example 62 to comparative example 2, the parameters are given in table 67:

TABLE 67 comparative example 2 and example 62 Performance parameters

Item	Comparative example 2	Example 62
			△n	0.104	0.104
Δε	+2.6	2.5
			ε_⊥	2.6	3.5
Cp	76	75
			γ1	51	56
K₁₁	13.6	12.5
			K₂₂	6.8	6.3
K₃₃	16.2	14.4

It is known from comparison that the vertical dielectric constant of example 62 is improved by about 30% compared to that of comparative example 2, and the transmittance of the lcd can be effectively improved by about 6%, and the optical data is shown in table 68:

table 68 color coordinate and transmittance test results of comparative example 2 and example 62

Item	Comparative example 2	Example 62
			Color temperature	6421.00	6167
Brightness of light	27.16	28.67
			x	0.3140	0.3188
y	0.3304	0.3318

The transmittance characteristics are shown in comparison with fig. 2.

The composition provided by the invention has large vertical dielectric, can effectively improve the transmittance characteristic of a liquid crystal display, and is specifically realized by adding a II compound to improve the parallel dielectric of the liquid crystal composition, adding an I compound with negative dielectric anisotropy to increase the vertical dielectric of the composition, and reducing the rotational viscosity of the liquid crystal composition by using a III compound, so as to achieve the liquid crystal composition with fast response and high transmittance.

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

1. A positive-negative mixed liquid crystal composition characterized by: the formula is as follows:

2. a positive-negative mixed liquid crystal composition characterized by: the formula is as follows:

3. use of the composition of claim 1 or 2 in a liquid crystal display device.

4. Use according to claim 3, wherein the liquid crystal display device is a liquid crystal display of FFS and IPS display modes.