CN109880638B - Liquid crystal composition, liquid crystal display element and liquid crystal display - Google Patents
Liquid crystal composition, liquid crystal display element and liquid crystal display Download PDFInfo
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Abstract
The invention relates to a liquid crystal composition, a liquid crystal display element containing the liquid crystal composition and a liquid crystal display, and belongs to the field of liquid crystal display. The liquid crystal composition comprises one or more compounds shown as a formula I and one or more compounds selected from the group consisting of a formula IIA, a formula IIB and a formula IIC, can improve the defect of residual images, and has good ultraviolet resistance, high temperature resistance, lower threshold voltage, moderate optical anisotropy, lower rotational viscosity and good low-temperature solubility.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, and particularly relates to a liquid crystal composition, and a liquid crystal display element or a liquid crystal display containing the liquid crystal composition.
Background
With the development of display technology, flat panel display devices such as liquid crystal displays (Liquid Crystal Display, LCDs) have been widely used in various consumer electronic products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and have become the mainstream of display devices, because of their advantages such as high image quality, power saving, thin body, and wide application range. The demands of liquid crystal flat panel display are increasing. Therefore, there is also a higher demand for quality characteristics of liquid crystal materials used in liquid crystal flat panel displays.
In the use process of the liquid crystal display, the liquid crystal composition is continuously influenced by light radiation and heat radiation, and meanwhile, in the manufacture process of the liquid crystal display or the liquid crystal composition, the liquid crystal composition is inevitably contacted with light and heat, and the light and the heat contact, especially the light and the high temperature of ultraviolet band, can cause the liquid crystal molecules to be negatively influenced in terms of impurities, thereby influencing the change of the anchoring capacity of the liquid crystal molecules and further influencing the display effect of the liquid crystal display.
Therefore, it is an urgent need in the art to provide a liquid crystal composition with good anti-uv and anti-high temperature capabilities, and improved residual image defects.
Disclosure of Invention
The present inventors have conducted intensive studies to solve the above-mentioned problems, and have found that the liquid crystal composition of the present invention can improve the residual image defect and has excellent ultraviolet resistance and high temperature resistance.
The invention also provides a liquid crystal display element containing the liquid crystal composition and a liquid crystal display.
Specifically, the present invention includes the following:
in a first aspect of the present invention, there is provided a liquid crystal composition comprising:
one or more compounds of formula I; the method comprises the steps of,
one or more compounds selected from the group consisting of formula IIA, formula IIB, and formula IIC,
in the formula I, Z 1 Represents an alkylene group having 1 to 20 carbon atoms, any one or more hydrogens in the alkylene group being optionally substituted with halogen, any one or more non-adjacent-CH 2 -optionally substituted with-O-;
in formula IIA, R 1 An alkyl group having 1 to 10 carbon atoms;
in formula IIB, R 2 An alkyl group having 1 to 10 carbon atoms;
in the formula IIC, R 3 Represents an alkyl group having 1 to 10 carbon atoms.
In another aspect of the present invention, there is provided a liquid crystal display element comprising the liquid crystal composition of the present invention, the liquid crystal display element being an active matrix display element or a passive matrix display element.
In yet another aspect of the present invention, a liquid crystal display is provided comprising the liquid crystal composition of the present invention, the liquid crystal display being an active matrix display or a passive matrix display.
The liquid crystal composition has good ultraviolet resistance and high temperature resistance, lower threshold voltage and can improve the afterimage defect by containing the compound shown in the formula I and the compound selected from the group consisting of the formula IIA, the formula IIB and the formula IIC. In addition, the liquid crystal composition of the invention has moderate optical anisotropy delta n, lower viscosity and good low-temperature solubility.
The liquid crystal display element and the liquid crystal display have the advantages of no afterimage or unobvious afterimage, wide nematic phase temperature range, proper or high optical anisotropy, high voltage retention rate, good ultraviolet resistance, high temperature resistance, high response speed and low threshold voltage by containing the liquid crystal composition.
Detailed Description
[ liquid Crystal composition ]
The liquid crystal composition of the present invention comprises one or more compounds represented by the following formula I and one or more compounds selected from the group consisting of the following formulas IIA, IIB and IIC,
in the formula I, Z 1 Represents an alkylene group having 1 to 20 carbon atoms, any one or more hydrogens in the alkylene group being optionally substituted with halogen, any one or more non-adjacent-CH 2 -optionally substituted with-O-;
in formula IIA, R 1 An alkyl group having 1 to 10 carbon atoms;
in formula IIB, R 2 An alkyl group having 1 to 10 carbon atoms;
in the formula IIC, R 3 Represents an alkyl group having 1 to 10 carbon atoms.
Z is as described above 1 The alkylene group having 1 to 20 carbon atoms may be straight-chain or branched. In addition, the aforementioned alkylene group may optionally have a ring structure. The alkylene group is preferably a linear structure.
By combining the compounds shown in the formula I and the compounds selected from the group consisting of the compounds shown in the formula IIA, the formula IIB and the formula IIC, the liquid crystal composition has good ultraviolet resistance, high temperature resistance, lower threshold voltage, moderate optical anisotropy delta n, lower rotational viscosity and good low-temperature solubility. Especially, the defect of residual images can be effectively improved.
In the liquid crystal composition of the present invention, optionally, the aforementioned one or more compounds represented by formula I are selected from the group consisting of compounds represented by formulas I1 to I12,
further preferably, the one or more compounds of formula I are selected from the group consisting of compounds of formulas I6-I8.
In the liquid crystal composition of the present invention, optionally, the aforementioned one or more compounds represented by formula IIA are selected from the group consisting of compounds represented by formulas IIA 1 to IIA 4,
in the liquid crystal composition of the present invention, optionally, the aforementioned one or more compounds represented by formula IIB are selected from the group consisting of compounds represented by formulas IIB 1 to IIB 4,
in the liquid crystal composition of the present invention, optionally, the aforementioned one or more compounds represented by formula IIC are selected from the group consisting of compounds represented by formulas IIC 1 to IIC 4,
TABLE 1 physical Property parameters of representative Compounds of the formula IIA, IIB, or IIC
The compounds shown in the formulas IIA and IIC can provide larger elastic constants and clearing points, and the compounds shown in the formulas IIC have larger optical anisotropies. The compounds of formula IIB are capable of providing greater dielectric anisotropy and smaller rotational viscosity.
The liquid crystal composition of the present invention is preferably a positive dielectric anisotropic liquid crystal composition.
In the liquid crystal composition of the present invention, the amount (mass ratio) of the compound represented by the formula I to be added to the liquid crystal composition is not particularly limited, and may be, for example, 0.01 to 1%, preferably 0.03 to 0.2% relative to the total amount of other components of the liquid crystal composition excluding the compound represented by the formula I; the amount (mass ratio) of the compound represented by the formula IIA, the formula IIB, and/or the formula IIC to be added to the liquid crystal composition is not particularly limited, and may be, for example, 1 to 50%, preferably 1 to 30%, based on the total amount of other components of the liquid crystal composition excluding the compound represented by the formula I.
In the liquid crystal composition of the present invention, optionally, one or more compounds represented by the following formula III,
in the formula III, R 4 、R 5 Each 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, or an alkenyloxy group having 3 to 8 carbon atoms;
The compound shown in the formula III has the characteristics of low rotational viscosity and good intersolubility with other compounds. The liquid crystal composition of the present invention contains a compound represented by formula III, which is advantageous in further improving the response speed of the liquid crystal composition.
The amount (mass ratio) of the compound represented by the formula III to be added to the liquid crystal composition is not particularly limited, and may be, for example, 10 to 70%, preferably 20 to 60%, based on the total amount of other components of the liquid crystal composition excluding the compound represented by the formula I.
Optionally, the compound represented by the formula III is selected from the group consisting of compounds represented by formulas III 1 to III 16,
in the liquid crystal composition of the present invention, optionally, one or more compounds represented by the following formula IV in addition to the compounds represented by the formulas IIA, IIB, and IIC,
in the formula IV, R 6 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 or an alkenyloxy group having 3 to 8 carbon atoms, and R 6 Any one or more of-CH 2 Optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene;
Z 2 Represents a single bond, -CH 2 -、-CH 2 -CH 2 -、-(CH 2 ) 3 -、-(CH 2 ) 4 -、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF 2 O-、-OCH 2 -、-CH 2 O-、-OCF 2 -、-CF 2 CH 2 -、-CH 2 CF 2 -、-C 2 F 4 -or-cf=cf-;
X 1 、X 2 each independently represents H or F; x is X 3 Represent H, F or methyl;
Y 1 representing-F, -CF 3 、-OCF 3 、-OCF 2 H or-OCH 2 F；
m represents 0, 1 or 2.
The compound shown in the formula IV is positive dielectric anisotropy, and the threshold voltage of the liquid crystal composition is further regulated by the compound shown in the formula IV.
The amount (mass ratio) of the compound represented by the formula IV other than the compounds represented by the formulas IIA, IIB, and IIC to be added to the liquid crystal composition is not particularly limited, and may be, for example, 1 to 50%, preferably 10 to 30%, based on the total amount of other components of the liquid crystal composition excluding the compound represented by the formula I.
As R in the aforementioned compounds of formula IV other than the compounds of formulae IIA, IIB, and IIC 6 One or more non-adjacent-CH in the alkyl group having 1 to 10 carbon atoms 2 Examples of the group substituted with a cyclopropylene group, a cyclobutylene group or a cyclopentylene group include a cyclopropyl group, a cyclobutylene group, a cyclopentyl group, a methylcyclopropylene group, an ethylcyclopropylene group, a propylcyclopropylene group, an isopropylcyclopropylene group, a n-butylcyclopropylene group, an isobutylcyclopropylene group, a tert-butylcyclopropylene group, a methylcyclobutylene group, an ethylcyclobutylene group, a propylcyclobutylene group, an isopropylcyclobutylene group, a n-butylcyclobutylene group, an isobutylcyclobutylene group, a tert-butylcyclobutylene group, a methylcyclopentylene group, an ethylcyclopentylene group, a propylcyclopentylene group, an isopropylcyclopentylene group, a n-butylcyclopentylene group, an isobutylcyclopentylene group and the like. R is R 6 Among the groups shown, cyclopropyl or cyclopentyl is preferable from the viewpoints of the rotational viscosity, solubility and clearing point of the liquid crystal compound.
Optionally, the one or more compounds of formula IV other than the compounds of formula IIA, IIB, and IIC are selected from the group consisting of compounds of formulas IV 1-IV 27 described below,
r in the formulae IV 1 to IV 27 6 R in the compound shown in the formula IV 6 Each 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 or an alkenyloxy group having 3 to 8 carbon atoms, and R 6 Any one or more of the groups shown-CH 2 Optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene; (F) in the formulae IV 1 to IV 6 each independently represents H or F; - (O) CF of formula IV 7 3 representation-CF 3 or-OCF 3 。
In the liquid crystal composition of the present invention, optionally, one or more compounds represented by the following formula V,
in V, R 7 、R 8 Each 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 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;
The compounds of formula V have a high clearing point and elastic constant, in particular the splay elastic constant K 11 The liquid crystal composition of the present invention contains the compound represented by the formula V, which is advantageous in improving the clearing point and the splay elastic constant K of the liquid crystal composition 11 。
In the case of containing the compound represented by the formula V in the liquid crystal composition of the present invention, the amount (mass ratio) of the compound represented by the formula V to be added to the liquid crystal composition may be 1 to 30%, preferably 5 to 20%, based on the total amount of other components of the liquid crystal composition excluding the compound represented by the formula I.
Alternatively, the compound of formula V is selected from the group consisting of compounds of formulas V1 to V4,
wherein R is 71 、R 81 Each independently represents an alkyl group having 2 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms; among them, the alkenyl group having 2 to 6 carbon atoms includes, for example, vinyl group, 2-propenyl group, and 3-pentenyl group. R is R 82 An alkoxy group having 1 to 5 carbon atoms.
The liquid crystal composition of the invention can optionally further comprise one or more compounds shown in the following formula VI,
in formula VI, R 9 、R 10 Each 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, or a fluorine-substituted alkenyl group having 2 to 10 carbon atomsAlkenyloxy having 3 to 8 carbon atoms or fluorine-substituted alkenyloxy having 3 to 8 carbon atoms;
F 1 、F 2 、F 3 Each independently represents H or F, and F 2 、F 3 And F is not the same time.
The compounds of formula VI have a high clearing point. The clearing point of the liquid crystal composition of the present invention can be significantly improved by including the compound represented by formula VI in the liquid crystal composition of the present invention.
In the case where the liquid crystal composition of the present invention contains the compound represented by formula VI, the amount of the compound represented by formula VI added to the liquid crystal composition (mass ratio) may be 1 to 10%, preferably 2 to 5%, relative to the total amount of other components of the liquid crystal composition excluding the compound represented by formula I.
Alternatively, the compound of formula VI is selected from the group consisting of compounds of formulas VI 1-VI 3,
wherein R is 91 、R 101 Each independently preferably represents an alkyl group having 2 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms.
In the liquid crystal composition of the present invention, optionally, one or more compounds represented by the following formula VII,
in formula VII, R 11 、R 12 Each 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 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 R 11 、R 12 Any one or more non-adjacent-CH(s) 2 -optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene;
Z 3 represents a single bond, -CF 2 O-、-CH 2 CH 2 -or-CH 2 O-；Z 4 Represents a single bond, -CH 2 CH 2 -or-CH 2 O-；
q represents 1 or 2; n represents 0, 1 or 2.
The present inventors have found that by further including the compound represented by formula VII in the liquid crystal composition, the vertical dielectric constant of the liquid crystal composition can be adjusted by utilizing the large vertical dielectric of the compound represented by formula VII, so that the liquid crystal composition can maintain a low rotational viscosity, and the vertical dielectric constant of the liquid crystal composition can be further increased with a slight sacrifice of the response speed, thereby obtaining a liquid crystal composition transmittance in which the vertical dielectric constant is increased while maintaining a certain response speed.
In the liquid crystal composition of the present invention, the amount (mass ratio) of the compound represented by the formula VII to be added to the liquid crystal composition is not particularly limited, and may be, for example, 1 to 30%, preferably 10 to 25%, relative to the total amount of other components of the liquid crystal composition excluding the compound represented by the formula I.
Alternatively, one or more of the compounds of formula VI described above may be selected from the group consisting of compounds of formulas VII 1-VII 21,
wherein R is 111 、R 121 Each 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 or an alkenyloxy group having 3 to 8 carbon atoms, and R 111 、R 121 -CH not linked to any one or more of the groups shown 2 -optionally each independently substituted with cyclopentylene, cyclobutylene or cyclopropyl ene.
In the liquid crystal composition of the invention, optionally, one or more compounds shown in a formula VIII,
in formula VIII, R 13 、R 14 Each 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 R 11 、R 12 Any one or more non-adjacent-CH(s) 2 Optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene; w represents-O-, -S-or-CH 2 O-。
The compound shown in the formula VIII has larger vertical dielectric property than the compound shown in the formula VII, and the compound shown in the formula VIII can be added in a small amount to obtain larger vertical dielectric property, so that the transmittance of the liquid crystal composition can be further improved.
In the liquid crystal composition of the present invention, the amount (mass ratio) of the compound represented by the formula VIII to be added to the liquid crystal composition is not particularly limited, and may be, for example, 1 to 15%, preferably 2 to 10%, based on the total amount of other components of the liquid crystal composition excluding the compound represented by the formula I.
Alternatively, the compound of formula VIII is selected from the group consisting of compounds of formulas VIII 1-VIII 6,
wherein R is 141 Represents an alkyl group having 2 to 6 carbon atoms.
In the liquid crystal composition of the present invention, optionally, various functional dopants may be added, and when the dopants are contained, the content of the dopants is preferably 0.01 to 1% by mass based on the liquid crystal composition, and examples of the dopants include antioxidants, ultraviolet absorbers, and chiral agents.
The ultraviolet ray absorber may be exemplified by,
t represents an integer of 1 to 10.
[ liquid Crystal display element, liquid Crystal display ]
The invention also relates to a liquid crystal display element comprising the liquid crystal composition of the invention, which display element is an active matrix display element or a passive matrix display element.
The invention also relates to a liquid crystal display comprising the liquid crystal composition of the invention, which display is an active matrix display or a passive matrix display.
The liquid crystal display element and the liquid crystal display of the invention have no afterimage or unobvious afterimage, and have a wide nematic phase temperature range, proper or high optical anisotropy, high voltage retention, good ultraviolet resistance, high temperature resistance, high response speed and low threshold voltage by comprising the liquid crystal composition of the invention.
The liquid crystal display element and the liquid crystal display of the present invention are not limited in any way as long as the liquid crystal composition of the present invention is contained, and those skilled in the art can select a suitable liquid crystal display element and liquid crystal display structure according to the desired performance.
Examples
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
In the invention, the preparation method is a conventional method unless specified otherwise, the raw materials used can be obtained from the disclosed commercial path unless specified otherwise, the percentages refer to mass percentages, the temperature is in degrees centigrade (DEG C), the liquid crystal compound is also a liquid crystal monomer, and the specific meanings and testing conditions of other symbols are as follows:
cp represents a liquid crystal clearing point (DEG C), and is tested by DSC quantification;
Δn represents optical anisotropy, Δn=n e -n o Wherein n is o Refractive index of ordinary ray, n e The refractive index of the extraordinary ray is 25+/-2 ℃ and is measured by an Abbe refractometer at 589 nm;
delta epsilon represents dielectric anisotropy, delta epsilon = epsilon-epsilon, wherein epsilon is the dielectric constant parallel to the molecular axis, epsilon is the dielectric constant perpendicular to the molecular axis, the test condition is 25+/-0.5 ℃ and 20-micrometer antiparallel box, INSTC is the ALCT-CUST-4C test;
VHR represents a voltage holding ratio (%), and the test conditions were 20±2 ℃, voltage ±5V, pulse width 10ms, and voltage holding time 16.7ms. The test equipment is a TOYO Model6254 liquid crystal performance comprehensive tester;
gamma 1 represents the rotational viscosity (mPas) under the test conditions of 25+ -0.5deg.C, 20 μm antiparallel box, INSTEC: ALCT-CUST-4C test.
Residual image: the residual image of the liquid crystal display device was obtained by displaying a predetermined fixed pattern in the display area for 1000 hours, and then evaluating the residual level of the fixed pattern by visual inspection when the full-screen uniform display was performed.
No residue
The level of O with little residue is allowable
Delta has residues at an unacceptable level
X has residues, quite poor
The preparation method of the liquid crystal composition comprises the following steps: and weighing each liquid crystal monomer according to a certain proportion, putting the liquid crystal monomers into a stainless steel beaker, placing the stainless steel beaker with each liquid crystal monomer on a magnetic stirring instrument for heating and melting, adding a magnetic rotor into the stainless steel beaker after the liquid crystal monomers in the stainless steel beaker are melted, uniformly stirring the mixture, and cooling to room temperature to obtain the liquid crystal composition.
The structures of the liquid crystal monomers used in the examples of the present invention are represented by codes, and the codes of the liquid crystal ring structures, the terminal groups and the linking groups are represented by the following tables 2 and 3.
Table 2: corresponding code of ring structure
Table 3: corresponding codes of end groups and linking groups
Examples:
Example 1:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 4 below.
Table 4: formulation and corresponding Properties of the liquid Crystal composition of example 1
Example 2:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 5 below.
Table 5: formulation and corresponding Properties of the liquid Crystal composition of example 2
Example 3:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 6 below.
Table 6: formulation and corresponding Properties of the liquid Crystal composition of example 3
Example 4:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 7 below.
Table 7: formulation and corresponding Properties of the liquid Crystal composition of example 4
Example 5:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 8 below.
Table 8: formulation and corresponding Properties of the liquid Crystal composition of example 5
Example 6:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 9 below.
Table 9: formulation and corresponding Properties of the liquid Crystal composition of example 6
Example 7:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 10 below.
Table 10: formulation and corresponding Properties of the liquid Crystal composition of example 7
Example 8:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 11 below.
Table 11: formulation and corresponding Properties of the liquid Crystal composition of example 8
Example 9:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 12 below.
Table 12: formulation and corresponding Properties of the liquid Crystal composition of example 9
Comparative example 1:
the formulation 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 comparative example 1
Table 14 shows the reliability test data of the liquid crystal compositions of examples and comparative examples. The reliability of the liquid crystal composition is carried out by ultraviolet and high-temperature aging tests and VHR tests, and the smaller the VHR data change of the liquid crystal composition after ultraviolet and high temperature is, the stronger the ultraviolet and high-temperature resistance is.
First, the VHR data of the liquid crystal composition was measured as initial VHR data before the uv and high temperature aging test was performed, and then the VHR data of the liquid crystal composition was measured again after the uv and high temperature aging test was performed on the liquid crystal composition, and then the comparison was made.
Ultraviolet aging test: the liquid crystal composition was irradiated with 5000mJ energy under an ultraviolet lamp having a wavelength of 365 nm.
High temperature aging test: the liquid crystal composition was placed in an oven at 100 ℃ for one hour.
The ultraviolet resistance and the high temperature resistance of the liquid crystal composition can be judged by comparing VHR data before and after ultraviolet and high temperature aging tests of the liquid crystal composition. If the VHR data change after the aging test is smaller than the initial VHR data, the liquid crystal composition has stronger ultraviolet resistance and high temperature resistance, so that the liquid crystal composition has stronger resistance to damage of external environment in the working process, and the reliability of the liquid crystal composition is higher.
The liquid crystal compositions of examples and comparative examples were poured into a liquid crystal test cell, and an afterimage test was performed, and the test results are shown in table 14 below.
Table 14: experimental data on the reliability of examples and comparative examples
| Compounds of formula I | VHR | VHR (ultraviolet) | VHR (high temperature) | Residual image | |
| Example 1 | Ⅰ6 | 99.81 | 99.80 | 99.80 | ◎ |
| Example 2 | Ⅰ8 | 99.79 | 99.76 | 99.77 | ◎ |
| Example 3 | Ⅰ7 | 99.76 | 99.73 | 99.75 | ◎ |
| Example 4 | Ⅰ6 | 99.77 | 99.73 | 99.76 | ◎ |
| Example 5 | Ⅰ7 | 99.62 | 99.59 | 99.60 | ◎ |
| Example 6 | Ⅰ8 | 99.56 | 99.54 | 99.54 | ◎ |
| Example 7 | Ⅰ7 | 99.52 | 99.50 | 99.52 | ◎ |
| Example 8 | Ⅰ7 | 99.48 | 99.44 | 99.46 | ◎ |
| Example 9 | Ⅰ7 | 99.48 | 99.42 | 99.44 | ◎ |
| Comparative example 1 | —— | 99.48 | 99.28 | 99.12 | △ |
Comparative example 1 the liquid crystal composition does not contain the compound represented by formula i.
As can be seen from Table 14, examples 1 to 9 using the liquid crystal composition of the present invention showed a slight change in VHR before and after the ultraviolet and high temperature test, as compared with comparative example 1.
In addition, the liquid crystal composition has obvious effect of improving the residual image defect.
Claims (5)
1. A liquid crystal composition, characterized in that it comprises:
a compound represented by the following formula i-7; the method comprises the steps of,
compounds of formula IIA, IIB and IIC,
also comprises one or more compounds shown in a formula III;
one or more compounds shown in a formula IV except the compounds shown in a formula IIA, a formula IIB and a formula IIC, wherein the compounds shown in the formula IV are selected from the compounds shown in a formula IV 9, a formula IV 11 and a formula IV 15;
one or more compounds of formula V;
one or more compounds of formula VI;
in formula IIA, R 1 An alkyl group having 1 to 10 carbon atoms;
in formula IIB, R 2 Representing the number of carbon atomsAlkyl of 1 to 10;
in the formula IIC, R 3 An alkyl group having 1 to 10 carbon atoms;
in the formula III, R 4 、R 5 Each 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, or an alkenyloxy group having 3 to 8 carbon atoms;
In the formulas IV 9, IV 11 and IV 15, R 6 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 or an alkenyloxy group having 3 to 8 carbon atoms, and R 6 Any one or more of-CH 2 Optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene;
in V, R 7 、R 8 Each 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 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;
In formula VI, R 9 、R 10 Each independently represents an alkyl group having 1 to 10 carbon atoms and a carbon atomAn 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;
F 1 、F 2 、F 3 Each independently represents H or F, and F 2 、F 3 F is not the same time;
in the liquid crystal composition other than the compounds shown in the formula I-7, the mass ratio of the compounds shown in the formula IIA, the formula IIB and the formula IIC is 2%, 3% and 5%, or the mass ratio of the compounds shown in the formula IIA, the formula IIB and the formula IIC is 5%, 5% and 10%, respectively; the mass ratio of one or more compounds shown in the formula III is 30-40%; the mass ratio of one or more compounds shown in the formula IV is 25%; the mass ratio of one or more compounds shown in the formula V is 10%; the mass ratio of one or more compounds shown in the formula VI is 5%; the mass addition amount of the compound shown in the formula I-7 in the liquid crystal composition is 0.05% to 0.2%.
2. The liquid crystal composition according to claim 1, further comprising one or more compounds represented by the following formula VII,
in formula VII, R 11 、R 12 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or a compound having 2 carbon atoms10 or 3 to 8 alkenyl groups, fluorine-substituted alkenyl group having 2 to 10 carbon atoms, 3 to 8 alkenyloxy group having 3 to 8 carbon atoms, and R 11 、R 12 Any one or more non-adjacent-CH(s) 2 -optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene;
Z 3 represents a single bond, -CF 2 O-、-CH 2 CH 2 -or-CH 2 O-；Z 4 Represents a single bond, -CH 2 CH 2 -or-CH 2 O-；
q represents 1 or 2; n represents 0, 1 or 2.
3. The liquid crystal composition according to claim 1, further comprising one or more compounds of formula VIII,
in formula VIII, R 13 、R 14 Each 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; w represents-O-, -S-or-CH 2 O-。
4. A liquid crystal display element comprising the liquid crystal composition according to any one of claims 1 to 3, the display element being an active matrix display element or a passive matrix display element.
5. A liquid crystal display comprising the liquid crystal composition of any one of claims 1 to 3, the liquid crystal display being an active matrix display or a passive matrix display.
Priority Applications (1)
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| CN112920809B (en) * | 2019-12-20 | 2022-10-14 | 石家庄诚志永华显示材料有限公司 | Liquid crystal composition, liquid crystal display element and liquid crystal display |
| CN112940736A (en) * | 2019-12-20 | 2021-06-11 | 石家庄诚志永华显示材料有限公司 | Liquid crystal composition, liquid crystal display element and liquid crystal display |
| CN113072960A (en) * | 2020-01-03 | 2021-07-06 | 北京八亿时空液晶科技股份有限公司 | Liquid crystal composition containing 2-methyl-3, 4, 5 trifluorobenzene structure and application thereof |
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