阅读说明：本技术 负介电各向异性液晶组合物、液晶显示元件及液晶显示器 (negative dielectric anisotropy liquid crystal composition, liquid crystal display element and liquid crystal display ) 是由 邢文晓 李佳明 梁瑞祥 孙轩非 黄亚鹏 高红茹 于 2018-06-11 设计创作，主要内容包括：本发明涉及负介电各向异性液晶组合物、液晶显示元件及液晶显示器。本发明的负介电各向异性液晶组合物包括一种或多种式Ⅰ所示化合物组成的第一组分,以及一种或多种可聚合化合物组成的第二组分：<Image he="191" wi="700" file="DDA0001692097480000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>本发明公开的负性介电各向异性液晶组合物具有旋转粘度低、响应速度快、以及良好的稳定性,非常适用于制造液晶显示元件,尤其适合于PS(聚合物稳定)或PSA(聚合物稳定配向)型的液晶显示器。(the invention relates to a negative dielectric anisotropy liquid crystal composition, a liquid crystal display element and a liquid crystal display. The liquid crystal composition with negative dielectric anisotropy comprises a first component consisting of one or more compounds shown as a formula I and a second component consisting of one or more polymerizable compounds: The negative dielectric anisotropic liquid crystal composition disclosed by the invention has the advantages of low rotational viscosity, high response speed and good stabilityIt is very suitable for the manufacture of liquid crystal display elements, especially for liquid crystal displays of the PS (polymer stabilized) or PSA (polymer sustained alignment) type.)

1. A negative dielectric anisotropic liquid crystal composition comprising a first component comprising one or more compounds represented by formula I and a second component comprising one or more polymerizable compounds,

Wherein R is₁Represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms, and R is₁Any one or more CH₂Optionally substituted with cyclopentyl, cyclobutyl or cyclopropyl;

R₂Is represented by- (CH)₂)_p-CH＝CH-C_qH_2q+1p and q each independently represent 0, 1, 2 or 3;

L₁、L₂Each independently represents H, F or Cl;

Each independently representJ₁、J₂Each independently represents H, F or Cl.

2. The negative dielectric anisotropic liquid crystal composition of claim 1, wherein the polymerizable compound is a compound represented by formula II,

wherein R is₃、R₄Each independently represents W-Sp-, H, Cl, F or alkyl with 1-12 carbon atoms; one or two non-adjacent CH in the alkyl with 1-12 carbon atoms₂The radicals being optionally substituted by-O-, -CH₂＝CH₂-, -CO-, -OCO-or-COO-substitution; wherein R is₃、R₄At least one of them represents W-Sp-;

Each independently represents phenylene, phenylene optionally substituted by W-Sp-, Cl, F, alkyl with 1-12 carbon atoms, alkoxy with 1-12 carbon atoms or indanyl, wherein one or two non-adjacent CH in the alkyl with 1-12 carbon atoms and the alkoxy with 1-12 carbon atoms₂The radicals being optionally substituted by-O-, -CH₂＝CH₂-, -CO-, -OCO-or-COO-andAnd R₃In thatIs bonded at any position of the first and second substrates,And R₄In thatBonding at any position of (a);

n represents 0, 1 or 2;

W represents a methacrylate group or an acrylate group;

V, Sp each independently represents a single bond, -COO-, -CH₂O-or-CH₂CH₂-。

3. the negative dielectric anisotropic liquid crystal composition according to claim 1 or 2, wherein:

The compound represented by the formula I is selected from the group consisting of compounds represented by the formulae I1 to I6,

Wherein R is₁Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted chain having 2 to 10 carbon atomsAn alkenyl group or an alkenyloxy group having 3 to 8 carbon atoms; and R is₁Any one or more CH₂Optionally substituted with cyclopentyl, cyclobutyl or cyclopropyl;

R₂Is represented by- (CH)₂)_p-CH＝CH-C_qH_2q+1P represents 0, 1, 2 or 3, q represents 0, 1, 2 or 3;

the compound represented by the formula II is selected from the group consisting of compounds represented by formulas II 1 to II 4,

Wherein R is₄And K independently represent W₁-Sq-, H, Cl, F, or alkyl of 1-12 carbon atoms, wherein one or two non-adjacent CH in the alkyl of 1-12 carbon atoms₂The radicals being optionally substituted by-O-, -CH₂＝CH₂-, -CO-, -OCO-or-COO-in place,

W、W₁Each independently represents a methacrylate group or an acrylate group;

V, Sp and Sq each independently represent a single bond, -COO-, -CH₂O-, or-CH₂CH₂-；

each i independently represents 0, 1, 2, 3 or 4.

4. The negative dielectric anisotropic liquid crystal composition of any one of claims 1 to 3, further comprising one or more compounds represented by formula III,

Wherein R is₅、R₆each independently represents an alkyl group having 1 to 10 carbon atoms or a group having 1 to 10 carbon atoms1-10 alkoxy, and R₅、R₆any one or more CH₂Optionally substituted with cyclopentyl, cyclobutyl or cyclopropyl;

each independently represent

r represents 1 or 2.

5. The negative dielectric anisotropic liquid crystal composition of claim 4, wherein the one or more compounds represented by formula III are selected from the group consisting of compounds represented by III 1 to III 5,

Wherein R is₅、R₆Each independently an alkyl group having 1 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms, and R₆Any one or more CH₂Optionally substituted by cyclopentyl, cyclobutyl or cyclopropyl.

6. The negative dielectric anisotropic liquid crystal composition of any one of claims 1 to 5, further comprising one or more compounds represented by formula IV,

Wherein R is₇、R₈Each independently represents an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, or a C1-substituted alkyl group10 alkoxy or fluorine-substituted alkoxy having 1 to 10 carbon atoms, and R₇、R₈Any one of CH₂Optionally substituted with cyclopentyl, cyclobutyl or cyclopropyl;

Z₁、Z₂each independently represents a single bond, -COO-, -CH₂O-or-CH₂CH₂-；

Each independently represent or,

x represents 1, 2 or 3; y represents 0 or 1.

7. The negative dielectric anisotropic liquid crystal composition of claim 6, wherein the one or more compounds represented by formula IV are selected from the group consisting of compounds represented by IV 1 to IV 13,

wherein R is₇、R₈Each independently represents an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or a fluorine-substituted alkoxy group having 1 to 10 carbon atoms, and R₇、R₈Any one of CH₂Optionally substituted by cyclopentyl, cyclobutyl or cyclopropyl.

8. The negative dielectric anisotropic liquid crystal composition of any one of claims 1 to 7, further comprising one or more compounds of formula V,

Wherein R is₉、R₁₀each independently represents an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a fluorine-substituted alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and R₉、R₁₀any one of CH₂Optionally substituted with cyclopentyl, cyclobutyl or cyclopropyl;

Q₁represents-O-, -S-, -CH₂O-or-CH₂S-。

9. the negative dielectric anisotropic liquid crystal composition of claim 8, wherein: in the negative dielectric anisotropy liquid crystal composition, the mass percent content of the compound shown in the formula I is 1-50%, the mass percent content of the compound shown in the formula II is 0.1-1%, the mass percent content of the compound shown in the formula III is 10-50%, the mass percent content of the compound shown in the formula IV is 1-60%, and the mass percent content of the compound shown in the formula V is 1-50%.

10. A liquid crystal display element or a liquid crystal display comprising the negative dielectric anisotropic liquid crystal composition of any one of claims 1 to 9, which is a PSA-VA, PSA-OCB, PS-IPS, PS-FFS, PS-TN or SA-VA display element or display.

Technical Field

The invention relates to the technical field of liquid crystal display. And more particularly, to a negative dielectric anisotropy liquid crystal composition, a liquid crystal display element, and a liquid crystal display.

Background

thin film transistor-liquid crystal displays (TFT-LCDs) undergo a long basic research phase, and have become mainstream products in LCD applications due to their advantages of lightness, thinness, environmental protection, high performance, and the like after large-scale production and commercialization: the TFT-LCD can be widely applied to small-sized mobile phone screens, large-sized Notebook computers (Notebook PCs) or monitors (monitors), and large-sized liquid crystal televisions (LCD-TVs).

Early commercial TFT-LCD products basically adopted the TN display mode, and the biggest problem thereof was the narrow viewing angle. With the increase of the product size, especially the application in the TV field, IPS display mode and VA display mode with wide viewing angle feature are developed and applied in sequence, and especially based on the improvement of VA display mode, breakthrough development is successively obtained in each company, which mainly depends on the advantages of VA mode, such as wide viewing angle, high contrast, no need of rubbing and alignment, etc. In addition, the VA mode has a small dependence of the contrast on the optical anisotropy (Δ n) of the liquid crystal, the thickness (d) of the liquid crystal cell, and the wavelength (λ) of the incident light, and thus the VA mode is a promising display technology.

however, the liquid crystal medium used for the display element of the active matrix addressing method such as VA mode is not perfect, and for example, the residual image level is significantly inferior to that of the display element of positive dielectric anisotropy, and the liquid crystal medium has disadvantages of relatively slow response time, relatively high driving voltage, and the like. At this time, some of the novel VA display technologies are silent but are still living: for example, the PSVA technology realizes a wide-viewing-angle display mode similar to MVA/PVA, and simplifies the CF process, thereby reducing the CF cost, improving the aperture opening ratio, obtaining higher brightness and further obtaining higher contrast. In addition, because the liquid crystal of the whole surface has the pretilt angle and does not have domino delay phenomenon, the liquid crystal can obtain faster response time under the condition of keeping the same driving voltage, and the afterimage level can not be influenced. For example, the UVVA technology has an improved display unevenness problem caused by the uneven width of the pixel electrode due to the absence of the Slit structure on the TFT side while maintaining the advantages of the PSVA technology. Although display devices are continuously developed, research into new liquid crystal compositions has been continuously conducted, so that the liquid crystal compositions and the properties thereof applied to the display devices, particularly the response speed and the improvement of various display defects, are continuously developed.

Disclosure of Invention

The invention aims to provide a negative dielectric anisotropy liquid crystal composition and a liquid crystal display element or a liquid crystal display comprising the same, and aims to solve the problem of slow response time of the negative dielectric anisotropy liquid crystal composition.

To solve the above technical problem, a first aspect of the present invention is:

a negative dielectric anisotropic liquid crystal composition comprising a first component of one or more compounds represented by formula i, and a second component of one or more polymerizable compounds:

Wherein R is₁Represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms, and R is₁Any one or more CH₂Optionally substituted with cyclopentyl, cyclobutyl or cyclopropyl;

R₂is represented by- (CH)₂)_p-CH＝CH-C_qH_2q+1P and q each independently represent 0, 1, 2 or 3;

L₁、L₂Each independently represents H, F or Cl;

each independently representJ₁、J₂Each independently represents H, F or Cl.

The polymerizable compound may be exemplified by one or a combination of more of acrylate, acrylate derivative, methacrylate derivative, styrene derivative, and epoxy resin. The polymerizable compound may be added to the liquid crystal composition singly, or a mixture of two or more polymerizable compounds may be used.

Alternatively, in the negative dielectric anisotropy liquid crystal composition, the ratio of the first component to the second component may be, for example, 99 to 99.9% by mass of the first component and 0.1 to 1% by mass of the second component.

optionally, the polymerizable compound is a compound shown as a formula II;

Wherein R is₃、R₄Each independently represents W-Sp-, H, Cl, F, alkyl with 1-12 carbon atoms; one or two non-adjacent CH in the alkyl with 1-12 carbon atoms₂The radicals being optionally substituted by-O-, -CH₂＝CH₂-, -CO-, -OCO-or-COO-substitution; wherein R is₃、R₄At least one of them represents W-Sp-;

Each independently represents phenylene, optionallyPhenylene substituted by W-Sp-, Cl, F, alkyl with 1-12 carbon atoms, alkoxy with 1-12 carbon atoms, or indanyl, wherein one or two non-adjacent CH in the alkyl with 1-12 carbon atoms and the alkoxy with 1-12 carbon atoms₂The radicals being optionally substituted by-O-, -CH₂＝CH₂-, -CO-, -OCO-or-COO-andand R₃In thatIs bonded at any position of the first and second substrates,And R₄In thatbonding at any position of (a);

n represents 0, 1 or 2;

W represents a methacrylate group or an acrylate group;

v, Sp each independently represents a single bond, -COO-, -CH₂O-or-CH₂CH₂-。

Optionally, the compound represented by the general formula I is selected from the group consisting of compounds represented by formulas I1 to I6,

Wherein R is₁represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms; and R is₁Any one or more CH₂Optionally substituted with cyclopentyl, cyclobutyl or cyclopropyl;

R₂Is represented by- (CH)₂)_p-CH＝CH-C_qH_2q+1p represents 0, 1, 2 or 3, q represents 0, 1, 2 or 3;

The compound represented by the formula II is selected from the group consisting of compounds represented by formulas II 1 to II 4,

Wherein R is₄And K independently represent W₁-Sq-, H, Cl, F, alkyl of 1-12 carbon atoms, wherein one or two non-adjacent CH in alkyl of 1-12 carbon atoms₂the radicals being optionally substituted by-O-, -CH₂＝CH₂-, -CO-, -OCO-or-COO-in place,

W、W₁each independently represents a methacrylate group or an acrylate group;

V, Sp and Sq each independently represent a single bond, -COO-, -CH₂O-or-CH₂CH₂-；

each I independently represents 0, 1, 2, 3 or 4.

Optionally, the compound of formula II is selected from the group consisting of compounds of formulae II 5-II 12:

optionally, the negative dielectric anisotropic liquid crystal composition further comprises one or more compounds shown in a formula III,

Wherein R is₅、R₆Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, and R₅、R₆Any one of themOr a plurality of CH₂Optionally substituted with cyclopentyl, cyclobutyl or cyclopropyl;

Each independently represent

r represents 1 or 2.

Optionally, the one or more compounds of formula III are selected from the group consisting of compounds of formula III 1-III 5,

Wherein R is₅、R₆Each independently represents an alkyl group having 1 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms, and R₅、R₆any one or more CH₂optionally substituted by cyclopentyl, cyclobutyl or cyclopropyl.

The compound shown in the formula III has the characteristic of low rotational viscosity, and can reduce the rotational viscosity of a liquid crystal composition and improve the response speed when used in the liquid crystal composition.

Optionally, the negative dielectric anisotropy liquid crystal composition also comprises one or more compounds shown in a formula IV,

wherein R is₇、R₈Each independently represents an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or a fluorine-substituted alkoxy group having 1 to 10 carbon atoms, and R₇、R₈Any one of CH₂Optionally substituted with cyclopentyl, cyclobutyl or cyclopropyl;

Z₁、Z₂each independently represents a single bond, -COO-, -CH₂O-or-CH₂CH₂-；

Each independently represent Or,

x represents 1, 2 or 3; y represents 0 or 1.

Optionally, the one or more compounds of formula IV are selected from the group consisting of compounds of formula IV 1-IV 13,

Wherein R is₇、R₈Each independently represents an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or a fluorine-substituted alkoxy group having 1 to 10 carbon atoms, and R₇、R₈Any one of CH₂Optionally substituted by cyclopentyl, cyclobutyl or cyclopropyl.

The compound shown in the formula IV has larger negative dielectric anisotropy, and can effectively reduce the driving voltage of the liquid crystal composition when being used in the liquid crystal composition.

optionally, the negative dielectric anisotropic liquid crystal composition further comprises one or more compounds shown in formula V.

Wherein R is₉、R₁₀each independently represents an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a fluorine-substituted alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and R₉、R₁₀Any one of CH₂optionally substituted by cyclopentyl, cyclobutyl or cyclopropyl, Q₁represents-O-, -S-, -CH₂O-or-CH₂S-。

The compound shown in the formula V has larger negative dielectric anisotropy relative to the formula IV, and when the compound is used in the liquid crystal composition, the polar compound shown in the formula V can be used in a smaller content to keep the liquid crystal composition to have the same driving voltage, so that the content of the neutral compound in the liquid crystal composition is increased, and the effect of reducing the viscosity of the liquid crystal composition is achieved.

optionally, in the negative dielectric anisotropy liquid crystal composition, the mass percent of the compound represented by the formula I is 1-50%, the mass percent of the compound represented by the formula II is 0.1-1%, the mass percent of the compound represented by the formula III is 10-50%, the mass percent of the compound represented by the formula IV is 1-60%, and the mass percent of the compound represented by the formula V is 1-50%; wherein the content of each liquid crystal compound in the liquid crystal composition is calculated by taking the total content of the compounds shown in the formulas I, III, IV and V in the liquid crystal composition as 100 percent as a standard.

optionally, in the negative dielectric anisotropy liquid crystal composition, the mass percent content of the compound represented by formula I is 1 to 50%, the mass percent content of the compound represented by formula ii is 0.1 to 1%, and the mass percent content of the compound represented by formula III is 10 to 70%, wherein the content of each liquid crystal compound in the liquid crystal composition is calculated by taking the total content of the compounds represented by formula I and formula III in the liquid crystal composition as 100%.

optionally, in the negative dielectric anisotropy liquid crystal composition, the mass percent content of the compound represented by formula I is 1 to 50%, the mass percent content of the compound represented by formula ii is 0.1 to 1%, and the mass percent content of the compound represented by formula IV is 10 to 60%, wherein the content of each liquid crystal compound in the liquid crystal composition is calculated by taking the total content of the compounds represented by formula I and formula IV in the liquid crystal composition as 100%.

Optionally, in the negative dielectric anisotropy liquid crystal composition, the mass percent content of the compound represented by formula I is 1 to 50%, the mass percent content of the compound represented by formula ii is 0.1 to 1%, and the mass percent content of the compound represented by formula V is 10 to 60%, wherein the content of each liquid crystal compound in the liquid crystal composition is calculated by taking the total content of the compounds represented by formula I and formula V in the liquid crystal composition as 100%.

Optionally, in the negative dielectric anisotropy liquid crystal composition, the mass percentage content of the compound represented by formula I is 1 to 50%, the mass percentage content of the compound represented by formula ii is 0.1 to 1%, the mass percentage content of the compound represented by formula iii is 10 to 50%, and the mass percentage content of the compound represented by formula IV is 10 to 60%, wherein the content of each liquid crystal compound in the liquid crystal composition is calculated by taking the total content of the compounds represented by formula I, formula iii, and formula IV in the liquid crystal composition as 100%.

Optionally, in the negative dielectric anisotropy liquid crystal composition, the mass percentage content of the compound represented by formula I is 1 to 50%, the mass percentage content of the compound represented by formula ii is 0.1 to 1%, the mass percentage content of the compound represented by formula iii is 10 to 50%, and the mass percentage content of the compound represented by formula V is 10 to 60%, wherein the content of each liquid crystal compound in the liquid crystal composition is calculated by taking the total content of the compounds represented by formula I, formula iii, and formula V in the liquid crystal composition as 100%.

The invention further provides a liquid crystal display element or a liquid crystal display, which comprises the negative dielectric anisotropy liquid crystal composition, and the display element or the display is a PSA-VA, PSA-OCB, PS-IPS, PS-FFS, PS-TN or SA-VA display element or display.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: (1) the negative dielectric anisotropic liquid crystal composition has the advantages that the rotational viscosity of the negative dielectric anisotropic liquid crystal composition is reduced and the response speed is improved by utilizing the first component consisting of one or more compounds shown as the formula I and the second component consisting of one or more polymerizable compounds. (2) The liquid crystal display element or the liquid crystal display has the characteristic of high response speed.

Detailed Description

In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

in the invention, the preparation method is a conventional method if no special description is provided, the used raw materials can be obtained from a public commercial way if no special description is provided, the percentages refer to mass percentage, the temperature is centigrade (DEG C), the liquid crystal compound also becomes a liquid crystal monomer, and the specific meanings and test conditions of other symbols are as follows:

cp represents a liquid crystal clearing point (DEG C), and is measured by a DSC quantitative method;

S-N represents the crystalline to nematic melting point (. degree. C.) of the liquid crystal;

Δ n represents optical anisotropy, and Δ n ═ n_e-n_owherein n is_orefractive index of ordinary light, n_eThe refractive index of the extraordinary ray is measured under the conditions of 25 +/-2 ℃ and 589nm, and the Abbe refractometer is used for testing;

Δ ∈ represents dielectric anisotropy, Δ ∈ ═ ε/ε ×, where ε/is the dielectric constant parallel to the molecular axis, ε × is the dielectric constant perpendicular to the molecular axis, the test conditions were 25 ± 0.5 ℃, 20 μm parallel cell, INSTEC: ALCT-IR1 test;

γ 1 represents rotational viscosity (mPa. multidot.s) at 25. + -. 0.5 ℃ in a 20 μm parallel cell INSTEC: ALCT-IR1 test;

rho represents resistivity (omega cm), the test condition is 25 +/-2 ℃, and the test instrument is a TOYO SR6517 high-impedance instrument and an LE-21 liquid electrode;

VHR represents the voltage holding ratio (%), and the test conditions are 20 +/-2 ℃, voltage +/-5V, pulse width 10ms and voltage holding time 16.7 ms. The testing equipment is a TOYO Model6254 liquid crystal performance comprehensive tester;

Tau represents response time (ms), the test instrument is DMS-501, the test condition is 25 +/-0.5 ℃, the test box is a 3.3-micrometer IPS test box, the electrode spacing and the electrode width are both 10 micrometers, and the included angle between the friction direction and the electrode is 10 degrees.

The equipment and the equipment used for preparing the liquid crystal medium are as follows:

(1) Electronic precision balance (precision 0.1mg)

(2) Stainless steel beaker: for weighing liquid crystals

(3) Spoon: for adding monomers

(4) a magnetic rotor: for stirring

(5) And (5) controlling the temperature of the electromagnetic stirrer.

The preparation method of the liquid crystal medium comprises the following steps:

(1) Orderly placing the monomers;

(2) Placing the stainless steel beaker on a balance, and putting the monomer into the stainless steel beaker by using a small spoon;

(3) Sequentially adding monomer liquid crystal according to the required weight;

(4) Placing the stainless steel beaker added with the materials on a magnetic stirring instrument for heating and melting;

(5) And after most of the mixture in the stainless steel beaker is melted, adding a magnetic rotor into the stainless steel beaker, uniformly stirring the liquid crystal mixture, and cooling to room temperature to obtain the liquid crystal medium.

The liquid crystal monomer structure of the embodiment of the invention is represented by codes, and the code representation methods of the liquid crystal ring structure, the end group and the connecting group are shown in the following tables 1 and 2.

Corresponding code of the ring structure of Table 1

TABLE 2 corresponding codes for end groups and linking groups

Examples are:

The code is CC-Cp-V1;

The code is PGP-Cpr 1-2.