WO2021253624A1 - Liquid crystal composition and liquid crystal display element or liquid crystal display - Google Patents

Abstract

A liquid crystal composition and a liquid crystal display element or liquid crystal display containing the liquid crystal composition, wherein the liquid crystal composition comprises one or more compounds represented by formula I, one or more compounds represented by formula II, and one or more compounds represented by formula III. The liquid crystal composition has a large K value, a large refractive index and high reliability, and has obvious advantages in ultra-wide temperature and high-contrast display such as in medical treatments, vehicles, etc.

Description

Liquid crystal composition, liquid crystal display element or liquid crystal display Technical field

The invention belongs to the technical field of liquid crystal materials, and specifically relates to a liquid crystal composition and a liquid crystal display element or a liquid crystal display containing the liquid crystal composition.

Background technique

Currently in the liquid crystal display market, the most competitive display modes include in-plane switching, IPS, fringe-field switching, FFS, and vertical alignment, VA and other display modes. In these display modes, both in-plane switching IPS and fringe field switching FFS have the characteristics of wide viewing angles. When the positive liquid crystal is used in the IPS/FFS display mode, it can obtain a fast response and good reliability; when the negative liquid crystal is used in the IPS/FFS display mode, it can obtain a higher transmittance.

As LCD (liquid crystal display) product technology is getting faster and faster, the performance requirements for LCD products are getting higher and higher. The pursuit of more perfect visual enjoyment, higher definition and adaptability to the environment has always been the goal of our display devices. With the development of technology, more and more products are used in vehicle displays and medical displays.

Medical displays belong to the category of medical devices. The technical standards are much higher than civilian products. The display clarity directly affects the doctor’s diagnosis. Therefore, "precision" and "clear" are essential attributes of medical display panels. Therefore, the liquid crystal material needs to have high contrast and high contrast. Reliable performance. The main liquid crystal display mode of medical liquid crystal display panels is FFS mode. At present, the contrast ratio is mostly lower than 1500:1. The medical market usually hopes the contrast ratio is greater than 2000:1. Therefore, the development of high contrast and high reliability (or high reliability) ) Liquid crystal material is a technical problem that needs to be solved urgently.

Vehicle-mounted displays require liquid crystals with ultra-wide temperature and high reliability performance indicators. In the hot summer, the temperature in the car can be as high as 70℃ or even higher. In the cold winter, the temperature in the car can be lower than -40℃, which requires the car display to achieve ultra-wide temperature display and high reliability. Therefore, the development of liquid crystal display materials with high reliability and ultra-wide temperature is also a major problem facing liquid crystal development.

Therefore, the development of a liquid crystal composition with high contrast, high reliability and ultra-wide temperature display is a technical problem that needs to be solved urgently.

Summary of the invention

The first object of the present invention is to provide a liquid crystal composition which has a higher clearing point, a large refractive index, a better solubility, and a larger K value, which can be used to develop high contrast, high Reliable, ultra-wide temperature display liquid crystal display element or liquid crystal display.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

The present invention provides a liquid crystal composition, characterized in that the liquid crystal composition comprises one or more compounds represented by formula I, one or more compounds represented by formula II, and one or more compounds represented by formula III Show compound:

in,

R ₁ and R ₂ each independently represent an alkyl group having 1-10 carbon atoms;

R ₃ , R ₄ , R ₅ , and R ₆ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, and an alkoxy group with 1-10 carbon atoms Group, fluorine-substituted alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, 3-carbon The alkenyloxy group of 8 or the alkenyloxy group having 3-8 carbon atoms substituted by fluorine.

Further preferably, the liquid crystal composition further comprises one or more compounds represented by formula IV, one or more compounds represented by formula V, one or more compounds represented by formula VI, one or more The compound represented by formula VII, one or more compounds represented by formula VIII, one or more compounds represented by formula IX, and one or more compounds represented by formula X:

in,

R ₇ and R ₈ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms.

R ₉ and R ₁₀ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms;

X ₁ , X ₂ , X ₃ , and X ₄ each independently represent H or F, and at least any two of them represent F at the same time.

R ₁₁ and R ₁₂ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms.

R ₁₃ and R ₁₄ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms.

R ₁₅ and R ₁₆ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms;

表示

Express

R ₁₇ and R ₁₈ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms, and any one or more of the groups represented by _{R 17} and R _{18 -CH 2} -may be optionally substituted by cyclopentylene, cyclobutylene or Cyclopropylene substitution;

X represents -O-, -S- or -CH ₂ O-.

R ₁₉ and R ₂₀ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms;

表示

Express

The second object of the present invention also provides a liquid crystal display element comprising the liquid crystal composition of the present disclosure, and the liquid crystal display element is an active matrix addressing display element or a passive matrix addressing display element.

The third object of the present invention also provides a liquid crystal display, which comprises the liquid crystal composition of the present disclosure, and the liquid crystal display is an active matrix addressing display or a passive matrix addressing display.

Invention effect

The liquid crystal composition of the present invention has a high clearing point, a large refractive index, a good solubility, and a large K value, and can be used to develop high-contrast, high-reliability, and ultra-wide temperature display liquid crystal display elements or liquid crystals. monitor.

detailed description

[Liquid crystal composition]

The present invention provides a liquid crystal composition, characterized in that the liquid crystal composition comprises one or more compounds represented by formula I, one or more compounds represented by formula II, and one or more compounds represented by formula III Show compound:

in,

R ₁ and R ₂ each independently represent an alkyl group having 1-10 carbon atoms;

R ₃ , R ₄ , R ₅ , and R ₆ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, and an alkoxy group with 1-10 carbon atoms Group, fluorine-substituted alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, 3-carbon The alkenyloxy group of 8 or the alkenyloxy group having 3-8 carbon atoms substituted by fluorine.

The liquid crystal composition of the present invention has a high clearing point, a large refractive index, a good solubility, and a large K value, and can be used to develop high-contrast, high-reliability, and ultra-wide temperature display liquid crystal display elements or liquid crystals. Displays, especially FFS mode liquid crystal display elements or liquid crystal displays.

In the liquid crystal composition of the present invention, preferably, the compound represented by formula I is selected from the group consisting of compounds represented by formula I-1 to I-5:

In the liquid crystal composition of the present invention, preferably, the compound represented by formula II is selected from the group consisting of compounds represented by formula II-1 to II-10:

In the liquid crystal composition of the present invention, further preferably, the compound represented by formula II is selected from the group consisting of compounds represented by formula II-2 to II-4, and II-6 to II-8:

In the liquid crystal composition of the present invention, preferably, the compound represented by formula III is selected from the group consisting of compounds represented by formula III-1 to III-4:

The liquid crystal composition of the present invention preferably further contains one or more compounds represented by formula IV:

in,

R ₇ and R ₈ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms.

In the liquid crystal composition of the present invention, preferably, the compound represented by formula IV is selected from the group consisting of compounds represented by formula IV-1 to IV-6:

In the liquid crystal composition of the present invention, further preferably, the compound represented by formula IV is selected from the group consisting of compounds represented by formula IV-1 to IV-3:

The liquid crystal composition of the present invention preferably further contains one or more compounds represented by formula V:

in,

R ₉ and R ₁₀ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms;

X ₁ , X ₂ , X ₃ , and X ₄ each independently represent H or F, and at least any two of them represent F at the same time.

In the liquid crystal composition of the present invention, preferably, the compound represented by formula V is selected from the group consisting of compounds represented by V-1 to V-3:

in,

R ₉ and R ₁₀ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms.

In the liquid crystal composition of the present invention, preferably, the compound represented by formula V-1 is selected from the group consisting of compounds represented by V-1-1 to V-1-12:

In the liquid crystal composition of the present invention, further preferably, the compound represented by formula V-1 is selected from the group consisting of compounds represented by formula V-1-1 to V-1-5:

In the liquid crystal composition of the present invention, preferably, the compound represented by formula V-2 is selected from the group consisting of compounds represented by V-2-1 to V-2-4:

In the liquid crystal composition of the present invention, preferably, the compound represented by formula V-3 is selected from the group consisting of compounds represented by V-3-1 to V-3-3:

The liquid crystal composition of the present invention preferably further contains one or more compounds represented by formula VI:

in,

R ₁₁ and R ₁₂ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms.

In the liquid crystal composition of the present invention, preferably, the compound represented by formula VI is selected from the group consisting of compounds represented by formula VI-1 to VI-12:

In the liquid crystal composition of the present invention, further preferably, the compound represented by formula VI is selected from the group consisting of compounds represented by formula VI-1 to VI-3, VI-11, VI-12:

The liquid crystal composition of the present invention preferably further contains one or more compounds represented by formula VII:

in,

R ₁₃ and R ₁₄ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms.

In the liquid crystal composition of the present invention, preferably, the compound represented by formula VII is selected from the group consisting of compounds represented by formula VII-1 to VII-6:

The liquid crystal composition of the present invention preferably further contains one or more compounds represented by formula VIII:

in,

R ₁₅ and R ₁₆ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms;

表示

Express

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VIII includes at least one or more selected from the group consisting of compounds represented by VIII-1 to VIII-9:

In the liquid crystal composition of the present invention, more preferably, the compound represented by formula VIII is selected from the group consisting of compounds represented by formula VIII-1, VIII-2 and VIII-5:

In the liquid crystal composition of the present invention, preferably, the aforementioned liquid crystal composition further contains one or more compounds represented by formula IX:

in,

R ₁₇ and R ₁₈ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms, and any one or more of the groups represented by _{R 17} and R _{18 -CH 2} -may be optionally substituted by cyclopentylene, cyclobutylene or Cyclopropylene substitution;

X represents -O-, -S- or -CH ₂ O-.

In the liquid crystal composition of the present invention, preferably, the compound represented by formula IX is selected from the group consisting of compounds represented by formula IX-1 to IX-12:

in,

R ₁₇₁ and R ₁₈₁ each independently represent an alkyl group having 1-10 carbon atoms.

The liquid crystal composition of the present invention, preferably, the aforementioned liquid crystal composition further comprises one or more selected from the group consisting of compounds represented by formula X:

in,

R ₁₉ and R ₂₀ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms;

表示

Express

In the liquid crystal composition of the present invention, more preferably, the compound represented by the aforementioned formula X is preferably a compound represented by the formula X-1:

As the aforementioned alkyl group having 1-10 carbon atoms, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isoamyl Base, hexyl, heptyl, octyl, nonyl, decyl, etc.

Examples of the aforementioned alkoxy group having 1-10 carbon atoms include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, and pentoxy. Group, hexyloxy, heptyloxy, octyloxy, nonyloxy, decyloxy, etc.

Examples of the aforementioned alkenyl group having 2-10 carbon atoms include vinyl, 1-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, and 1-pentenyl. , 2-pentenyl, 3-pentenyl, 4-pentenyl, 1-hexenyl, 2-hexenyl, 3-hexenyl, etc.

The aforementioned fluorine-substituted alkyl groups with 1-10 carbon atoms, fluorine-substituted alkoxy groups with 1-10 carbon atoms, fluorine-substituted alkenyl groups with 2-10 carbon atoms, and fluorine-substituted carbons The "fluorine substitution" in the alkenyloxy group with 3-8 atoms can be mono-fluorine substitution, or polyfluorine substitution such as difluorine substitution, trifluorine substitution, or perfluorine substitution. There is no substitution for fluorine. Special restrictions. For example, as fluorine-substituted alkyl groups with 1-10 carbon atoms, fluoromethyl, difluoromethyl, trifluoromethyl, 1-fluoroethyl, 2-fluoroethyl, 1 ,2-Difluoroethyl, 1,1-difluoroethyl, 1,1,2-trifluoroethyl, 1,1,1,2,2-pentafluoro-substituted ethyl, etc. but not limited thereto.

Various functional dopants can also be added to the liquid crystal compound of the present invention, and the dopant content is preferably between 0.01-1%. These dopants can include, for example, antioxidants, ultraviolet absorbers, and chiral agents.

Antioxidants can be listed,

Wherein, t represents an integer of 1-10;

Chiral agents (left-handed or right-handed) preferably include, for example:

[Liquid crystal display element or liquid crystal display]

The present invention also relates to a liquid crystal display element or liquid crystal display comprising any one of the above-mentioned liquid crystal compositions; the display element or display is an active matrix display element or display or a passive matrix display element or display.

The liquid crystal display element or liquid crystal display of the present invention is preferably an active matrix addressing liquid crystal display element or liquid crystal display.

The aforementioned active matrix display element or display can specifically include, for example, IPS-TFT or FFS-TFT or VA-TFT liquid crystal display element or other TFT displays, and FFS-TFT liquid crystal display elements or liquid crystal displays are especially suitable.

The liquid crystal composition of the present invention can be used to develop liquid crystal display elements or liquid crystal displays with high contrast, high reliability, and ultra-wide temperature display.

Example

In order to explain the present invention more clearly, the following further describes the present invention in combination with preferred embodiments. Those skilled in the art should understand that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

In this manual, unless otherwise specified, percentages refer to mass percentages, and the temperature is in degrees Celsius (℃). The specific meanings and test conditions of other symbols are as follows:

Cp represents the clearing point of liquid crystal (℃), measured by DSC quantitative method;

Δn represents an optical anisotropy, n _o is the refractive index of ordinary light, n _e of the extraordinary light refractive index of the non-test conditions of 25 ± 2 ℃, 589nm, Abbe refractometer test;

Δε represents the dielectric anisotropy, Δε=ε _∥ -ε _⊥ , where ε _∥ is the permittivity parallel to the molecular axis, and ε _⊥ is the permittivity perpendicular to the molecular axis. The test condition is 25±0.5°C, 20 micron vertical box, INSTEC: ALCT-IR1 test;

K ₁₁ is the splay elastic constant, K ₂₂ is the torsion elastic constant, and K ₃₃ is the flexural elastic constant. The test conditions are: 25°C, INSTEC: ALCT-IR1, 20 micron vertical box;

VHR represents the voltage retention rate (%), the test conditions are 60±1°C, the voltage is ±5V, the pulse width is 10ms, and the voltage retention time is 1.667ms. The test equipment is TOYO Model6254 LCD performance comprehensive tester;

CR represents the contrast ratio of the liquid crystal display device. The contrast ratio is the bright state of the liquid crystal display divided by the dark state of the liquid crystal display. The test condition is 25±1℃, the test voltage is the normal driving voltage, the test frequency is 64Hz, and the test equipment is DMS505.

The preparation method of the liquid crystal composition is as follows: each liquid crystal monomer is weighed according to a certain ratio and put into a stainless steel beaker, the stainless steel beaker containing each liquid crystal monomer is placed on a magnetic stirring instrument and heated and melted. After most of the liquid crystal monomer is melted, a magnetic rotor is added to the stainless steel beaker, the mixture is stirred uniformly, and the liquid crystal composition is obtained after cooling to room temperature.

The structure of the liquid crystal monomer in the embodiment of the present invention is represented by a code, and the code representation method of the liquid crystal ring structure, terminal group, and connecting group is shown in Table 1 and Table 2 below.

Table 1 Corresponding codes of ring structure

Table 2 Corresponding codes of end groups and linking groups

For example:

其代码为CPWP-4-O2；

Its code is CPWP-4-O2;

其代码为CPWP-5-2；

The code is CPWP-5-2;

其代码为PGP-3-2V；

Its code is PGP-3-2V;

其代码为PPY-3-O2；

Its code is PPY-3-O2;

其代码为CPY-2-O2；

Its code is CPY-2-O2;

其代码为CCY-3-O2；

Its code is CCY-3-O2;

其代码为COY-3-O2；

Its code is COY-3-O2;

其代码为CCOY-3-O2；

Its code is CCOY-3-O2;

其代码为CLY-3-O2；

Its code is CLY-3-O2;

其代码为Sb-CpO-O4；

Its code is Sb-CpO-O4;

其代码为Sc-CpO-O4。

Its code is Sc-CpO-O4.

Example 1

The formula and corresponding properties of the liquid crystal composition are shown in Table 3 below.

Table 3 The formula and corresponding properties of the liquid crystal composition of Example 1

Example 2

The formula and corresponding properties of the liquid crystal composition are shown in Table 4 below.

Table 4 The formula and corresponding properties of the liquid crystal composition of Example 2

Example 3

The formula and corresponding properties of the liquid crystal composition are shown in Table 5 below.

Table 5 The formula and corresponding properties of the liquid crystal composition of Example 3

Example 4

The formula and corresponding properties of the liquid crystal composition are shown in Table 6 below.

Table 6 The formula and corresponding properties of the liquid crystal composition of Example 4

Example 5

The formula and corresponding properties of the liquid crystal composition are shown in Table 7 below.

Table 7 The formula and corresponding properties of the liquid crystal composition of Example 5

Example 6

The formula and corresponding properties of the liquid crystal composition are shown in Table 8 below.

Table 8 The formula and corresponding properties of the liquid crystal composition of Example 6

Example 7

The formula and corresponding properties of the liquid crystal composition are shown in Table 9 below.

Table 9 The formula and corresponding properties of the liquid crystal composition of Example 7

Example 8

The formula and corresponding properties of the liquid crystal composition are shown in Table 10 below.

Table 10 The formula and corresponding properties of the liquid crystal composition of Example 8

Example 9

The formula and corresponding properties of the liquid crystal composition are shown in Table 11 below.

Table 11 The formula and corresponding properties of the liquid crystal composition of Example 9

Example 10

The formula and corresponding properties of the liquid crystal composition are shown in Table 12 below.

Table 12 The formula and corresponding properties of the liquid crystal composition of Example 10

Example 11

The formula and corresponding properties of the liquid crystal composition are shown in Table 13 below.

Table 13: Formulation and corresponding properties of the liquid crystal composition of Example 11

Comparative example 1

The formula and corresponding properties of the liquid crystal composition are shown in Table 14 below.

Table 14 The formula and corresponding properties of the liquid crystal composition of Comparative Example 1

The CC-2-3 and CC-5-3 in Example 5 were replaced with CC-3-V and CC-5-V respectively as Comparative Example 1.

Comparative example 2

The formula and corresponding properties of the liquid crystal composition are shown in Table 15 below.

Table 15 The formula and corresponding properties of the liquid crystal composition of Comparative Example 2

The CPWP-3-2 in Example 5 was replaced with CGPC-3-3 as Comparative Example 2.

Comparative example 3

The formula and corresponding properties of the liquid crystal composition are shown in Table 16 below.

Table 16 The formula and corresponding properties of the liquid crystal composition of Comparative Example 3

The CLY-3-O2 and CLY-4-O2 in Example 5 were replaced with CCY-3-O2 and CCY-4-O2 as Comparative Example 3.

Comparative example 4

The formula and corresponding properties of the liquid crystal composition are shown in Table 17 below.

Table 17 The formula and corresponding properties of the liquid crystal composition of Comparative Example 4

Replace CC-2-3 and CC-5-3 in Example 5 with CC-3-V and CC-5-V respectively; replace CPWP-3-2 with CGPC-3-3; CLY-3-O2 , CLY-4-O2 were replaced with CCY-3-O2 and CCY-4-O2 as Comparative Example 4.

_{Table 18 Comparison table of VHR, K average} , solubility and contrast CR of Examples 1-11 and Comparative Examples 1-4

The reliability of the liquid crystal composition is measured by initial, high temperature aging test and VHR test. The smaller the change in the VHR data before and after the high temperature test of the liquid crystal composition, the stronger the high temperature resistance. Therefore, the high temperature resistance ability is judged by comparing the difference of the VHR data before and after the test of each embodiment and comparative example. The display temperature range of the liquid crystal composition is judged by the clearing point of the liquid crystal composition and the low-temperature storage condition. The higher the clearing point of the liquid crystal composition, the lower the low-temperature storage temperature, the wider the display temperature range.

In the above experiment, the liquid crystal of the example and the comparative example were respectively poured into the test piece for testing. VHR represents the voltage retention rate (%), the test condition is 60±1℃, the voltage is ±5V, the pulse width is 10ms, and the voltage retention time is 1.667 ms; the test equipment is TOYO Model6254 liquid crystal performance comprehensive tester; the initial value of VHR is the data obtained by testing the test piece without any treatment; the high temperature aging of VHR is to put the liquid crystal infused piece in a high temperature oven at 100℃ for 1 hour Then test the VHR value.

Liquid crystal elastic constant is a physical quantity that describes the elastic deformation of liquid crystal molecules, including _{splay elastic constant K 11} , twist elastic constant K ₂₂ , and flexural elastic constant K ₃₃ . The larger the K value, the less likely it is for liquid crystal molecules to undergo elastic deformation. We use K _average to characterize the elastic coefficient of liquid crystal molecules, K _average = (K ₁₁ +K ₂₂ +K ₃₃ )/3. In the liquid crystal display, _{the average} size K and orderly arrangement of liquid crystal molecules related to, _{the average} value of K larger liquid crystal molecules arranged in more orderly, in a dark state without power is darker, can effectively improve the liquid crystal display Contrast. The contrast of the liquid crystal display=brightness/darkness, the higher the contrast, the higher the display clarity.

Compared with the comparative example, the liquid crystal composition of the present invention has a suitable clearing point, a large refractive index, a large K average, a high contrast, a better solubility, and a good high temperature resistance, and can be used to develop high contrast , High-reliability, ultra-wide temperature display liquid crystal display element or liquid crystal display.

The liquid crystal composition of the present invention only makes a corresponding comparison and replacement of Example 5. The comparison of other examples in the same manner will achieve the same technical effect, that is, the liquid crystal composition of the present invention has a higher clearing point and a large refraction. It can be used to develop liquid crystal display elements or liquid crystal displays with high contrast, high reliability, and ultra-wide temperature display.

The above-mentioned embodiments disclosed in the present invention are merely examples to clearly illustrate the present invention, and are not intended to limit the implementation of the present invention. For those of ordinary skill in the art, they can also make the following on the basis of the above description. Other changes or changes in different forms cannot be exhaustively listed here. Any obvious changes or changes derived from the technical solutions of the present disclosure are still within the protection scope of the present invention.

Claims (10)

A liquid crystal composition, characterized in that the liquid crystal composition comprises one or more compounds represented by formula I, one or more compounds represented by formula II, and one or more compounds represented by formula III:

in, R ₁ and R ₂ each independently represent an alkyl group having 1-10 carbon atoms; R ₃ , R ₄ , R ₅ , and R ₆ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, and an alkoxy group with 1-10 carbon atoms Group, fluorine-substituted alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, 3-carbon The alkenyloxy group of 8 or the alkenyloxy group having 3-8 carbon atoms substituted by fluorine. The liquid crystal composition of claim 1, wherein the liquid crystal composition further comprises one or more compounds represented by formula IV:

in, R ₇ and R ₈ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms. The liquid crystal composition of claim 2, wherein the liquid crystal composition further comprises one or more compounds represented by formula V:

in, R ₉ and R ₁₀ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms; X ₁ , X ₂ , X ₃ , and X ₄ each independently represent H or F, and at least any two of them represent F at the same time. The liquid crystal composition of claim 3, wherein the liquid crystal composition comprises one or more compounds represented by formula VI:

in, R ₁₁ and R ₁₂ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms. The liquid crystal composition of claim 4, wherein the liquid crystal composition comprises one or more compounds represented by formula VII:

in, R ₁₃ and R ₁₄ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms. The liquid crystal composition of claim 5, wherein the liquid crystal composition comprises one or more compounds represented by formula VIII:

in, R ₁₅ and R ₁₆ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or a fluorine-substituted alkenyloxy group with 3-8 carbon atoms;

Express

The liquid crystal composition of claim 6, wherein the liquid crystal composition further comprises one or more compounds represented by formula IX:

in, R ₁₇ and R ₁₈ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or fluorine-substituted alkenyloxy with 3-8 carbon atoms, and any one or more of the groups represented by _{R 17} and R _{18 -CH 2} -may be optionally substituted by cyclopentylene, cyclobutylene or Cyclopropylene substitution; X represents -O-, -S- or -CH ₂ O-. 8. The liquid crystal composition of claim 7, wherein the liquid crystal composition further comprises one or more compounds represented by formula X:

in, R ₁₉ and R ₂₀ each independently represent an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted carbon Alkyloxy with 1-10 atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and alkenyloxy with 3-8 carbon atoms Or a fluorine-substituted alkenyloxy group with 3-8 carbon atoms;

Express

A liquid crystal display element, comprising the liquid crystal composition of any one of claims 1-8, and the liquid crystal display element is an active matrix addressing display element or a passive matrix addressing display element. A liquid crystal display, characterized by comprising the liquid crystal composition of any one of claims 1-8, the liquid crystal display being an active matrix addressing display or a passive matrix addressing display.