CN109575952B

CN109575952B - Liquid crystal composition with high transmittance and liquid crystal display device thereof

Info

Publication number: CN109575952B
Application number: CN201710894136.5A
Authority: CN
Inventors: 马文阳; 王立威; 徐海彬; 韩文明; 张文琦
Original assignee: Jiangsu Hecheng Display Technology Co Ltd
Current assignee: Jiangsu Hecheng Display Technology Co Ltd
Priority date: 2017-09-28
Filing date: 2017-09-28
Publication date: 2021-12-03
Anticipated expiration: 2037-09-28
Also published as: CN109575952A

Abstract

Disclosure of the inventionA liquid crystal composition is provided, the liquid crystal composition comprising: at least one compound of the general formula I; and at least one polymerizable compound of the general formula II. The liquid crystal composition provided by the invention has suitable optical anisotropy and dielectric anisotropy, maintains a relatively high clearing point, and has higher maximum penetration rate and higher contrast. When the liquid crystal composition is applied to a PSVA type liquid crystal display, the liquid crystal composition has an excellent display effect. The invention also provides a liquid crystal display device comprising the liquid crystal composition.

Description

Liquid crystal composition with high transmittance and liquid crystal display device thereof

Technical Field

The invention relates to the field of liquid crystal materials, in particular to a liquid crystal composition with high transmittance and a liquid crystal display device thereof.

Background

Liquid Crystal Displays (LCDs) have been rapidly developed due to their small size, light weight, low power consumption and excellent Display quality, and are widely used particularly in portable electronic information products, among which active Thin Film Transistor Liquid Crystal displays (TFT-LCDs) are widely used. As for the TFT-LCD display panel currently on the mainstream market, there are three types, which are a Twisted Nematic (TN) or Super Twisted Nematic (STN) type, an In-Plane Switching (IPS) type, and a Vertical Alignment (VA) type.

In the application of liquid crystal display devices, the influence of contrast on visual effect is very critical, generally, the higher the contrast is, the clearer and more striking the image is, and the more vivid and gorgeous the color is; and if the contrast is low, the whole picture is gray. The high contrast ratio is very helpful for the definition, the detail expression and the gray level expression of the image. High contrast products have advantages in black and white contrast, clarity, integrity, etc. The contrast also has a large influence on the display effect of the dynamic video, and because the bright-dark conversion in the dynamic image is relatively fast, the higher the contrast is, the easier the eyes of people can distinguish the conversion process. Among the TFT-LCD display panels, the VA type LCD has a very high Contrast Ratio (CR) compared with other types of LCDs, generally reaching 4000-.

The VA-mode lcd panel has very high contrast because in the dark state without applying electricity, the liquid crystal molecules are aligned perpendicular to the substrate surface, no retardation is generated, the light leakage is very low, the off-state brightness is very low, and the contrast ratio is calculated according to the formula (CR ═ L)₂₅₅/L₀X 100%, wherein L₂₅₅Is at on-state brightness, L₀Off state luminance) is known: the lower the off-state brightness, the higher the contrast. In order to align the liquid crystal molecules in the VA mode lcd panel perpendicular to the substrate surface, a vertical alignment process is required to be performed on the liquid crystal molecules, and the most common practice is to coat a vertical alignment agent (Polyimide, PI solution) on specific areas of the upper and lower substrate surfaces, and then bake the substrate at a certain temperature for a long time to dry the solvent in the alignment agent, thereby forming a PI alignment layer on the substrate surface. Since the VA-mode liquid crystal display panel uses vertically rotating liquid crystals, the difference of birefringence of liquid crystal molecules is large, which causes a problem of color shift (color shift) at a large viewing angle to be serious.

In order to obtain better wide viewing angle characteristics and improve the color shift problem of the VA-type liquid crystal display panel, a multi-domain VA (MVA) technique is generally adopted, in which a sub-pixel is divided into a plurality of regions, and the liquid crystal in each region is tilted in different directions after a voltage is applied, so that the viewing effects in the respective directions tend to be even and uniform. With the development of technology, there has emerged a liquid crystal display panel of the MVA type, called polymer-stabilized vertical alignment (PSVA) type, which does not require the use of a PI alignment layer, by adding a small amount (e.g. 0.3 wt%, more typically < 1 wt%) of one or more polymerizable compounds to the liquid crystal composition and polymerizing or crosslinking it in situ (typically by UV photopolymerization) with or without the application of a voltage between the electrodes after charging the liquid crystal cell. The polymerization is carried out at a temperature at which the liquid-crystalline composition exhibits a liquid-crystalline phase, generally at room temperature. It has proved to be particularly suitable to add polymerizable liquid-crystalline compounds to the liquid-crystalline composition.

The luminance of the liquid crystal display panel is in a linear relationship with the transmittance (T), and the higher the luminance is, the more light is transmitted, that is, the higher the transmittance is, so the above-mentioned contrast calculation formula can be converted into: CR ═ T_max/T_minX 100%, wherein, T_maxDenotes the maximum penetration, T_minRepresenting the minimum penetration. As can be seen from the contrast formula, there are two methods for improving the contrast: 1: hoisting T_max(ii) a 2: reduction of T_min. While for a PSVA type display device, there is a small T_minIs one of the characteristics, T_minThe space for further reduction is relatively limited, so by raising T_maxIs a more effective means to improve contrast.

Disclosure of Invention

The purpose of the invention is as follows: in view of the defects of the prior art, the present invention aims to provide a liquid crystal composition having a suitable optical anisotropy, a suitable dielectric anisotropy, and a relatively high maximum transmittance and a higher contrast ratio while maintaining a relatively high clearing point, and a liquid crystal display device comprising the liquid crystal composition.

The technical scheme of the invention is as follows:

one aspect of the present invention provides a liquid crystal composition comprising:

at least one compound of the general formula I

At least one polymerizable compound of the general formula II

Wherein the content of the first and second substances,

R₁and R₂Each independently represents-H, -F, alkyl OR alkoxy containing 1-12 carbon atoms, alkenyl OR alkenyloxy containing 2-12 carbon atoms, -OR₅OR₆、

Or

Wherein one or more H of said alkyl or alkoxy and said alkenyl or alkenyloxy may be substituted by F, and R₁And R₂At least one of them is-OR₅OR₆；

R₅Represents an alkylene group having 1 to 12 carbon atoms or an alkenylene group having 2 to 12 carbon atoms, R₆Represents an alkyl group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms;

L₁、L₂、L₃and L₄Each independently represents-F, -Cl, -CN or-NCS;

P₁and P₂Each independently represent

or-SH;

r₁represents 1, 2 or 3;

r₂and r₃Each independently represents a positive integer of 0 to 6;

r₄and r₅Each independently represents 0, 1, 2, 3 or 4;

Z₁represents a single bond, -CH₂CH₂-, -COO-, -OCO-, -CH2O-, -OCH 2-or-CH-COO-;

Z_p1and Z_p2Each independently selected from the group consisting of a single bond, -O-, -S-, -NH-, -NHCOO-, -OCONH-, -CF₂O-、-OCF₂-、-CF₂S-、-SCF₂-、-CH₂CH₂-、-CF₂CH₂-、-CH₂CF₂-、-CF₂CF₂-、-CF＝CH-、-CH＝CF-、-CF＝CF-、-CO-、-COO-、-OCO-、-OCOO-、-CH₂-、-OCH₂-、-SCH₂-、-CH₂S-, -CH ═ CH-, -C ≡ C-, -CH ═ CH-COO-, and-OCO-CH ═ CH-;

Y₁and Y₂Each independently represents H, halogen, alkyl or alkoxy having 1 to 3 carbon atoms.

In some embodiments of the invention, the compound of formula I comprises 0.01 to 15 wt% of the total weight of the liquid crystal composition; further preferably, the compound of the general formula I accounts for 0.01-10% of the total weight of the liquid crystal composition.

In some embodiments of the present invention, the compound of formula II comprises 0.001 to 5 wt% of the total weight of the liquid crystal composition; further preferably, the compound of the general formula II accounts for 0.01-1% of the total weight of the liquid crystal composition.

Preferably, the compound of formula i is selected from the group consisting of:

wherein R is₁₁Represents an alkyl OR alkoxy group having 1 to 10 carbon atoms, an alkenyl OR alkenyloxy group having 2 to 10 carbon atoms, -OR₅OR₆；

R₅₁Represents an alkylene group having 1 to 10 carbon atoms or an alkenylene group having 2 to 10 carbon atoms, R₆₁Represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms.

Still further, the compound of I-1 is selected from the group consisting of:

wherein, if R₁₁represents-OR₅₁OR₆₁Then R is₅₁Is not- (CH)₂)₂-；

Wherein, if R₁₁represents-OR₅₁OR₆₁Then R is₅₁Is not- (CH)₂)₂-or- (CH)₂)₃-；

Wherein, if R₁₁represents-OR₅₁OR₆₁Then R is₅₁Is not- (CH)₂)₂-、-(CH₂)₃-or- (CH)₂)₄-；

Wherein, if R₁₁represents-OR₅₁OR₆₁Then R is₅₁Is not- (CH)₂)₂-、-(CH₂)₃-、-(CH₂)₄-or- (CH)₂)₅-；

Wherein, if R₁₁represents-OR₅₁OR₆₁Then R is₅₁Is not- (CH)₂)₂-、-(CH₂)₃-、-(CH₂)₄-、-(CH₂)₅-or- (CH)₂)₆-；

And

wherein, if R₁₁represents-OR₅₁OR₆₁Then R is₅₁Is not- (CH)₂)₂-、-(CH₂)₃-、-(CH₂)₄-、-(CH₂)₅-、-(CH₂)₆-or- (CH)₂)₈-。

Preferably, in the general formula II, P is₁And P₂Each independently represent

Or

Still further preferably, the compound of formula ii is selected from the group consisting of:

further, the liquid crystal composition further comprises at least one compound of formula III and/or at least one compound of formula IV:

wherein the content of the first and second substances,

R₃and R₄Each independently represents-H, -F, alkyl OR alkoxy containing 1-12 carbon atoms, alkenyl OR alkenyloxy containing 2-12 carbon atoms, -OR₅OR₆、

Or

Wherein one or more H of said alkyl or alkoxy and said alkenyl or alkenyloxy may be substituted by F;

Z₂represents a single bond, -COO-, -OCO-, -CH₂O-、-OCH₂-or-CH₂CH₂-；

L₅And L₆Each independently represents-F, -Cl, -CN or-NCS;

R₇and R₈Each independently represents H, an alkyl or alkoxy group having 1 to 12 carbon atoms, an alkenyl or alkenyloxy group having 2 to 12 carbon atoms;

ring (C)

To represent

Or

Wherein the content of the first and second substances,

in one or more-CH₂-can be replaced by-O-,

wherein at most one-H may be substituted by-F;

ring (C)

And ring

Each independently represent

Or

n represents 0, 1 or 2, and when n is 2, a ring

May be the same or different, Z₂May be the same or different;

m represents 1, 2 or 3, and when m is 2 or 3, a ring

May be the same or different.

Further preferably, the compound of formula iii is selected from the group consisting of:

wherein the content of the first and second substances,

R₃₁and R₄₁Each independently represents-H, -F, alkyl OR alkoxy containing 1-7 carbon atoms, alkenyl OR alkenyloxy containing 2-7 carbon atoms, -OR₅OR₆、

Or

Wherein one or more H of said alkyl or alkoxy and said alkenyl or alkenyloxy may be substituted by F.

In some embodiments of the invention, the compound of formula III is 20 to 60 wt% of the total weight of the liquid crystal composition; further preferably, the compound of the general formula III accounts for 35-60% of the total weight of the liquid crystal composition.

Further preferably, the compound of formula iv is selected from the group consisting of:

wherein the content of the first and second substances,

R₇₁and R₈₁Each independently represents H,Alkyl or alkoxy having 1 to 7 carbon atoms, alkenyl or alkenyloxy having 2 to 7 carbon atoms.

In some embodiments of the present invention, the compound of formula IV comprises 20 to 70 wt% of the total weight of the liquid crystal composition; further preferably, the compound of the general formula IV accounts for 40-65 wt% of the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of formula I is preferably selected from the group consisting of: i-3-2, I-3-3 and I-3-4.

In some embodiments of the invention, the compound of formula II is preferably selected from the group consisting of: II-24, II-64, II-20 and II-148.

In some embodiments of the invention, the compound of formula III is preferably selected from the group consisting of: III-2, III-9, III-6, III-3, III-7 and III-4.

In some embodiments of the invention, the compound of formula III is preferably selected from the group consisting of: IV-2, IV-6, IV-1, IV-3, IV-5, IV-9 and IV-10.

In another aspect, the present invention provides a liquid crystal composition further comprising one or more additives known to those skilled in the art and described in the literature. For example, pleochroic dyes and/or chiral dopants may be added in an amount of 0 to 15 wt% based on the total weight of the liquid crystal composition.

The following shows possible dopants which are preferably added to the composition according to the invention.

In some embodiments of the present invention, preferably, the dopant comprises 0 to 5 wt% of the total weight of the liquid crystal composition; more preferably, the dopant constitutes 0-1 wt% of the total weight of the liquid crystal composition.

The stabilizers which may be added to the compositions according to the invention are mentioned below, for example.

Preferably, the stabilizer is selected from the group consisting of the stabilizers shown below.

In some embodiments of the present invention, preferably, the stabilizer comprises 0 to 5 wt% of the total weight of the liquid crystal composition; more preferably, the stabilizer is 0-1 wt% of the total weight of the liquid crystal composition; as a particularly preferred embodiment, the stabilizer is 0 to 0.1 wt% of the total weight of the liquid crystal composition.

In another aspect, the present invention also provides a liquid crystal display device comprising the above liquid crystal composition.

Has the advantages that:

the liquid crystal composition provided by the invention has suitable optical anisotropy and dielectric anisotropy, maintains a relatively high clearing point, and has higher maximum penetration rate and higher contrast. When the liquid crystal composition is applied to a PSVA type liquid crystal display, the liquid crystal composition has an excellent display effect.

Detailed Description

The invention will be illustrated below with reference to specific embodiments. It should be noted that the following examples are illustrative of the present invention, and are not intended to limit the present invention. Other combinations and various modifications within the spirit or scope of the present invention may be made without departing from the spirit or scope of the present invention.

For convenience of expression, in the following examples, the group structure of the liquid crystal composition is represented by the code listed in Table 1:

TABLE 1 radical structural code of liquid crystal compounds

Compounds of the following formula are exemplified:

the structural formula is represented by the code listed in Table 1, and can be expressed as: nCCGF, wherein n in the code represents the number of C atoms of the left alkyl group, for example, n is 3, namely, the alkyl group is-C₃H₇(ii) a C in the code represents cyclohexane, G represents 2-fluoro-1, 4-phenylene and F represents fluorine.

The abbreviated codes of the test items in the following examples are as follows:

wherein the content of the first and second substances,

the optical anisotropy is obtained by testing an Abbe refractometer under a sodium lamp (589nm) light source at 25 ℃;

Δε＝ε_∥-ε_⊥wherein, epsilon_∥Is a dielectric constant parallel to the molecular axis,. epsilon_⊥For the dielectric constant perpendicular to the molecular axis, test conditions: the temperature is 25 ℃, the temperature is 1KHz, the test box is TN90 type, and the box thickness is 7 μm;

T_maxand (3) testing: the penetration rate of the dimming device is tested by using the DMS 505 under the voltage of 0-5V (step is 0.1V), the maximum value is selected and recorded, and the thickness of the box of the dimming device is 5.2 mu m.

The UV process conditions in the following examples: 16V drive, 80mw cm^-2And 365nm irradiation for 150s, the test cell being of the VA type, the cell thickness being 3 μm.

The components used in the following examples can be synthesized by a known method or obtained commercially. These synthesis techniques are conventional, and the resulting liquid crystal compounds were tested to meet the standards for electronic compounds.

Liquid crystal compositions were prepared according to the compounding ratios of the liquid crystal compositions specified in the following examples. The liquid crystal composition is prepared according to the conventional method in the field, such as heating, ultrasonic wave, suspension and the like, and is mixed according to the specified proportion.

Liquid crystal compositions given in the following examples were prepared and studied. The composition of each liquid crystal composition and the results of the performance parameter test thereof are shown below.

Comparative example 1

The liquid crystal composition of comparative example 1, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared by using the respective compounds and weight percentages listed in tables 2 and 3.

TABLE 2 liquid crystal composition formula

To 100 parts by weight of the above liquid crystal composition, polymerizable components in table 3 were added:

TABLE 3 polymerizable Components

The results of the performance parameter tests of the resulting composition are given in table 4 below:

table 4 performance parameter testing

Δn	0.094
		Δε	-3.1
Cp	73.7
		T_max(％)	27.2

Example 1

The liquid crystal composition of example 1 was prepared by replacing 3CWO4 in comparative example 1 with 3OWWO3O1, and filled between two substrates of a liquid crystal display for performance test as shown in table 5.

TABLE 5 liquid Crystal composition formulations

Component code	Weight percent (wt.%) of
		3CWO4O1	6
5CWO2	8
		2CPWO2	7
3CPWO4	9
		3OWWO3O1	7
3CCWO2	14
		4CCWO2	5
3CPO2	9
		3CPP2	6
3CC2	20
		4CC3	9
Total of	100

The contents and components of the polymerizable components were the same as in comparative example 1.

The results of the performance parameter tests of the resulting composition are given in table 6 below:

TABLE 6 Performance parameter testing

Δn	0.097
		Δε	-3.3
Cp	74.7
		T_max(％)	28.4

As can be seen from the comparison of comparative example 1 and example 1, the maximum penetration rate is significantly increased after the components of the general formula I of the present invention are introduced.

Comparative example 2

The liquid crystal composition of comparative example 2, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared by using the respective compounds and weight percentages listed in tables 7 and 8.

TABLE 7 liquid crystal composition formulations

Component code	Weight percent (wt.%) of
		3CC2	23
4CC3	3
		5PP1	11
3PWO2	10
		5CC3	4
3C1OWO2	4
		3CCP1	3
3CPP2	15
		3CPWO2	9
2CC1OWO2	7
		3CC1OWO2	11
Total of	100

To 100 parts by weight of the above liquid crystal composition, polymerizable components in table 8 were added:

TABLE 8 polymerizable Components

The results of the performance parameter tests of the resulting composition are given in table 9 below:

TABLE 9 Performance parameter testing

Δn	0.109
		Δε	-3.2
Cp	75.6
		T_max(％)	29.1

Example 2

The liquid crystal composition of example 2, in which 3C1OWO2 in comparative example 2 was replaced with 2OWWO4O1, respectively, was filled between two substrates of a liquid crystal display for performance test, as shown in table 10.

TABLE 10 liquid crystal composition formulations

Component code	Weight percent (wt.%) of
		3CC2	23
4CC3	3
		5PP1	11
3PWO2	10
		5CC3	4
2OWWO4O1	4
		3CCP1	3
3CPP2	15
		3CPWO2	9
2CC1OWO2	7
		3CC1OWO2	11
Total of	100

The contents and components of the polymerizable components were the same as in comparative example 2.

The results of the performance parameter tests of the resulting composition are given in table 11 below:

TABLE 11 Performance parameter testing

As can be seen from the comparison between comparative example 2 and example 2, the maximum penetration rate is significantly improved after the components of the general formula I of the present invention are introduced.

Comparative example 3

The liquid crystal composition of comparative example 3, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared by using the respective compounds and weight percentages listed in tables 12 and 13.

TABLE 12 liquid crystal composition formulations

Component code	Weight percent (wt.%) of
		2CPWO2	4
3CPWO2	5
		3C1OWO2	7
2CC1OWO2	10
		3CC1OWO2	10
4CC1OWO2	10
		3CPO2	3
3CPP2	6
		3CPPC3	3
3CGPC3	4
		3CC2	18
4CC3	6
		3CCP1	10
5PP1	4
		Total of	100

To 100 parts by weight of the above liquid crystal composition were added polymerizable components in table 13:

TABLE 13 polymerizable Components

The results of the performance parameter tests of the resulting composition are given in table 14 below:

TABLE 14 Performance parameter testing

Δn	0.109
		Δε	-3.3
Cp	110
		T_max(％)	29.3

Example 3

The liquid crystal compositions of example 3 were prepared by replacing 3C1OWO2 and 3CPO2 in comparative example 3 with 2OWWO5O1 and 3OWWO4O2, respectively, and filled between two substrates of a liquid crystal display for performance testing, as shown in table 15.

TABLE 15 liquid crystal composition formulations

Component code	Weight percent (wt.%) of
		2CPWO2	4
3CPWO2	5
		2OWWO5O1	7
2CC1OWO2	10
		3CC1OWO2	10
4CC1OWO2	10
		3OWWO4O2	3
3CPP2	6
		3CPPC3	3
3CGPC3	4
		3CC2	18
4CC3	6
		3CCP1	10
5PP1	4
		Total of	100

The contents and components of the polymerizable components were the same as in comparative example 3.

The results of the performance parameter tests of the resulting composition are given in table 16 below:

TABLE 16 Performance parameter testing

Δn	0.115
		Δε	-3.6
Cp	108.6
		T_max(％)	29.8

As can be seen from the comparison of comparative example 3 and example 3, the maximum penetration rate is significantly increased after the components of the general formula I of the present invention are introduced.

Comparative example 4

The liquid crystal composition of comparative example 4, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared by using the respective compounds and weight percentages listed in tables 17 and 18.

TABLE 17 liquid Crystal composition formulations

Component code	Weight percent (wt.%) of
		3CPO2	2
3CPP2	12
		3C1OWO2	11
2CC1OWO2	5
		3CC1OWO2	9
3CCWO2	7
		3CC2	22
4CC3	4
		5PP1	9
2C1OWO2	4
		4C1OWO2	4
3CPP1	5
		2CPP1	6
Total of	100

To 100 parts by weight of the above liquid crystal composition were added polymerizable components in table 18:

TABLE 18 polymerizable Components

The results of the performance parameter tests of the resulting composition are given in table 19 below:

TABLE 19 Performance parameter testing

Example 4

The liquid crystal composition of example 4, in which 3% of 3C1OWO2 in comparative example 4 was replaced with 2OWWO4O1, was filled between two substrates of a liquid crystal display device for performance test as shown in table 20.

TABLE 20 liquid Crystal composition formulations

Component code	Weight percent (wt.%) of
		3CPO2	2
3CPP2	12
		3C1OWO2	8
2OWWO4O1	3
		2CC1OWO2	5
3CC1OWO2	9
		3CCWO2	7
3CC2	22
		4CC3	4
5PP1	9
		2C1OWO2	4
4C1OWO2	4
		3CPP1	5
2CPP1	6
		Total of	100

The contents and components of the polymerizable components were the same as in comparative example 4.

The results of the performance parameter tests of the resulting composition are given in table 21 below:

TABLE 21 Performance parameter testing

Δn	0.100
		Δε	-3.0
Cp	75.6
		T_max(％)	29.5

As can be seen from the comparison of comparative example 4 and example 4, the maximum penetration rate is significantly increased after the components of the general formula I of the present invention are introduced.

Comparative example 5

The liquid crystal composition of comparative example 5, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared by using the respective compounds and weight percentages listed in tables 22 and 23.

TABLE 22 liquid crystal composition formulations

Component code	Weight percent (wt.%) of
		3CC1	17
3CCV1	11
		3CWO2	12
3PWO2	13
		3CWO4	2
3CPP2	9
		2CPWO2	9
3CCWO2	6
		3CPWO2	11
3CC1OC3	3
		5CPP2	3
4CC1OC3	4
		Total of	100

To 100 parts by weight of the above liquid crystal composition were added polymerizable components in table 23:

TABLE 23 polymerizable Components

The results of the performance parameter tests of the resulting composition are given in table 24 below:

TABLE 24 Performance parameter testing

Δn	0.108
		Δε	-3.3
Cp	74.9
		T_max(％)	28.2

Example 5

The liquid crystal composition of example 5, in which 2% of 3CWO4 in comparative example 5 was replaced with 3OWWO4O1, was filled between two substrates of a liquid crystal display device to perform a performance test, as shown in table 25.

TABLE 25 liquid crystal composition formulations

Component code	Weight percent (wt.%) of
		3CC1	17
3CCV1	11
		3CWO2	12
3PWO2	13
		3OWWO4O1	2
3CPP2	9
		2CPWO2	9
3CCWO2	6
		3CPWO2	11
3CC1OC3	3
		5CPP2	3
4CC1OC3	4
		Total of	100

The contents and components of the polymerizable components were the same as in comparative example 5.

The results of the performance parameter tests of the resulting composition are given in table 26 below:

TABLE 26 Performance parameter testing

Δn	0.109
		Δε	-3.4
Cp	75.2
		T_max(％)	29.1

As can be seen from the comparison of comparative example 5 and example 5, the maximum penetration rate is significantly increased after the components of the general formula I of the present invention are introduced.

From the above examples and comparative examples, it can be seen that the liquid crystal composition of the present invention has suitable optical anisotropy, suitable dielectric anisotropy, and higher maximum transmittance and higher contrast ratio while maintaining a relatively high clearing point. When the liquid crystal composition is applied to a PSVA type liquid crystal display, the liquid crystal composition has an excellent display effect.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and equivalent changes and modifications made according to the spirit of the present invention should be covered thereby.

Claims

1. A liquid crystal composition, comprising:

at least one compound of the formula I-1

At least one polymerizable compound of the general formula II

And

at least one compound of formula iii and at least one compound of formula iv:

and is

The compound of formula iv is selected from the group consisting of:

and

wherein the content of the first and second substances,

R₁₁represents an alkyl OR alkoxy group having 1 to 10 carbon atoms, an alkenyl OR alkenyloxy group having 2 to 10 carbon atoms, -OR₅OR₆；

R₅₁Represents an alkylene group having 1 to 10 carbon atoms or an alkenylene group having 2 to 10 carbon atoms, R₆₁Represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms;

P₁and P₂Each independently represent

or-SH;

r₁represents 1, 2 or 3;

r₂and r₃Each independently represents a positive integer of 0 to 6;

r₄and r₅Each independently represents 0, 1, 2, 3 or 4;

Z₁represents a single bond, -CH₂CH₂-、-COO-、-OCO-、-CH₂O-、-OCH₂-or-CH ═ CH-COO-;

Y₁and Y₂Each independently represents H, halogen, alkyl or alkoxy with 1-3C atoms;

L₅And L₆Each independently represents-F, -Cl, -CN or-NCS;

R₇₁and R₈₁Each independently represents H, an alkyl or alkoxy group having 1 to 7 carbon atoms, an alkenyl or alkenyloxy group having 2 to 7 carbon atoms;

ring (C)

To represent

Wherein the content of the first and second substances,

in one or more-CH₂-can be replaced by-O-,

wherein at most one-H may be substituted by-F;

ring (C)

And ring

Each independently represent

n represents 0, 1 or 2, and when n is 2, a ring

May be the same or different, Z₂May be the same or different;

m represents 1, 2 or 3, and when m is 2 or 3, a ring

Which may be the same or different from each other,

and is

The compound of the general formula I-1 accounts for 1-15 wt% of the total weight of the liquid crystal composition;

the compound of the general formula II accounts for 0.001-5 wt% of the total weight of the liquid crystal composition;

the compound of the general formula III accounts for 20-60 wt% of the total weight of the liquid crystal composition;

the compound of the general formula IV accounts for 20-70 wt% of the total weight of the liquid crystal composition.

2. The liquid crystal composition of claim 1, wherein in the formula II, P is₁And P₂Each independently represent

3. The liquid crystal composition of claim 2, wherein the compound of formula ii is selected from the group consisting of:

and

4. a liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 3.