CN113234453A - Liquid crystal composition and liquid crystal display - Google Patents

Liquid crystal composition and liquid crystal display Download PDF

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CN113234453A
CN113234453A CN202110585966.6A CN202110585966A CN113234453A CN 113234453 A CN113234453 A CN 113234453A CN 202110585966 A CN202110585966 A CN 202110585966A CN 113234453 A CN113234453 A CN 113234453A
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CN113234453B (en
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吴伟
孙刚
陈雷
吴立东
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Chongqing Hanlang Precision Technology Co ltd
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Halation Photonics Corp
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    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
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    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods

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Abstract

The invention relates to a liquid crystal composition and a liquid crystal display, and belongs to the technical field of liquid crystal display. The liquid crystal composition contains one or more than two compounds shown in general formulas J-1 to J-4, one or more than two compounds shown in general formula Na, one or more than two compounds shown in general formula Nb, one or more than two compounds shown in general formula K and reactive compounds shown in general formula RM. The liquid crystal composition has excellent performance, negative dielectric anisotropy, large refractive index anisotropy, high nematic phase-isotropic liquid phase transition temperature and small rotary viscosity, and the polymerization reaction speed of the reactive monomer is high enough. The liquid crystal display using the liquid crystal composition has small residual amount of the reactive monomer, so that the change of the pretilt angle before and after driving is small, high voltage holding ratio is displayed, poor display such as screen burn is not generated or inhibited, and excellent display quality is displayed.

Description

Liquid crystal composition and liquid crystal display
Technical Field
The invention relates to a liquid crystal composition and a liquid crystal display, and the liquid crystal composition can be applied to a PSVA type or PSA type liquid crystal display device, belonging to the technical field of liquid crystal display.
Background
Liquid crystal displays are widely used in mobile phones, smart phones, notebook computers, tablet computers, televisions, and the like. As the liquid crystal display technology mode, a TN (twisted nematic) mode, an STN (super twisted nematic) mode, a GH (guest host) mode, an IPS (in-plane switching) mode, an FFS (fringe field switching) mode, an OCB (optically compensated birefringence) mode, an ECB (voltage controlled birefringence) mode, a VA (vertical alignment) mode, a CSH (color super vertical alignment) mode, an FLC (ferroelectric liquid crystal) mode, and the like are mainly included. The liquid crystal display driving method mainly includes a static driving method, a multiplex driving method, a simple matrix method, and an Active Matrix (AM) method in which driving is performed by using a TFT (thin film transistor), a TFD (thin film diode), or the like. Among them, the IPS type, FFS type, ECB type, VA type, CSH type, and the like exhibit favorable characteristics when a liquid crystal composition (negative liquid crystal composition) exhibiting a negative dielectric anisotropy (Δ ∈) is used.
In display technologies using a negative liquid crystal composition, there are a vertical Alignment system represented by a VA type, and a PSVA (Polymer Stabilized vertical Alignment) type or a PSA (Polymer Stabilized Alignment) type in which a reactive monomer is further polymerized in a liquid crystal phase to control liquid crystal Alignment, and a horizontal Alignment system represented by an IPS type or an FFS type. The vertical alignment method has features of a wide viewing angle, high transmittance, high contrast, and fast response speed, and is mainly used for large display devices such as TVs, monitors, and the like.
In the liquid crystal display of PSVA type or PSA type, a polymer structure is formed in a cell in order to control the pretilt angle of liquid crystal molecules, and the liquid crystal display has the remarkable characteristics of high-speed response and high contrast in the vertical alignment mode.
The manufacturing process of the liquid crystal display of PSVA type or PSA type is as follows: the liquid crystal composition containing the reactive monomer is injected between the substrates, and ultraviolet irradiation is performed while the liquid crystal molecules are aligned by applying a voltage, thereby polymerizing the reactive monomer and fixing the alignment of the liquid crystal molecules. Therefore, in the step of polymerizing the reactive monomer in the liquid crystal composition, the polymerization reaction rate of the reactive monomer is very important. On the other hand, if the polymerization reaction rate is high, the residual amount of the reactive monomer decreases in a short ultraviolet irradiation time, and thus deterioration of reliability of the liquid crystal composition due to ultraviolet irradiation is less likely to occur. In addition, it has the advantages of low energy consumption and high production efficiency.
On the other hand, when the polymerization reaction rate is low, a long ultraviolet irradiation time is required to reduce the residual amount of the reactive monomer. Therefore, when strong ultraviolet rays are irradiated for a long time in the polymerization step, the production apparatus becomes large, the production efficiency is lowered, and the reliability of the liquid crystal composition is deteriorated due to the ultraviolet rays. However, if the irradiation time of ultraviolet rays is shortened, the amount of the residual reactive monomer increases, and the residual reactive monomer causes a display defect called burn-in.
Therefore, a liquid crystal composition capable of improving the polymerization reaction rate of the reactive monomer is desired. An example of patent document CN 104726107B of the prior art proposes a method of improving the polymerization reaction rate of a reactive monomer by extending the absorption wavelength of a liquid crystal material used to the longer wavelength side using a terphenyl compound (for example, the following structures R-1 and R-2), but the variation of the pretilt angle and the reliability represented by the voltage holding ratio are not sufficient.
Figure BDA0003087953190000011
Figure BDA0003087953190000021
Disclosure of Invention
The purpose of the present invention IS to provide a liquid crystal composition containing a reactive monomer, which has a sufficiently high polymerization rate of the reactive monomer, IS most suitable for a PSA or PSVA liquid crystal display having no or little display defects such as Image Sticking (IS) and MURA due to a change in pretilt angle, and has high VHR and high reliability.
The present inventors have intensively studied in detail and found that the above technical problems can be solved by using a liquid crystal composition containing a compound having a specific chemical structure and a reactive monomer.
In order to achieve the purpose, the invention adopts the following technical scheme:
a liquid crystal composition containing one or more compounds represented by general formulae J-1 to J-4 as a first component, one or more compounds represented by general formula Na as a second component, one or more compounds represented by general formula Nb as a third component, one or more compounds represented by general formula K as a fourth component, and a reactive compound represented by general formula RM (reactive monomer) as a fifth component;
wherein the structure of the compounds shown in the general formulas J-1 to J-4 is as follows:
Figure BDA0003087953190000022
in the formula, RJ1Represents an alkyl group having 1 to 12 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group, one or more-CH groups not adjacent to the alkyl group2-may be independently substituted with-CH ═ CH-, -O-, -CO-, -COO-, or-OCO-;
the structure of the compound shown as the general formula Na is as follows:
Figure BDA0003087953190000023
in the formula, RNa1And RNa2The meaning of (A) and RJ1Are identical, i.e. RNa1And RNa2Each represents an alkyl group having 1 to 12 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group, and one or more-CH groups which are not adjacent to each other in the alkyl group2-may be independently substituted with-CH ═ CH-, -O-, -CO-, -COO-, -OCO-; zNa1represents-CH-, -CH ═ CH-2-CH2-、-CH2O-、-CF2O-、-OCH2-or-OCF2-; x represents 0, 1, 2 or 3; p represents 1, 2 or 3;
the structure of the compound represented by the general formula Nb is as follows:
Figure BDA0003087953190000024
in the formula, RNb1And RNb2The meaning of (A) and RJ1Are identical, i.e. RNb1And RNb2Each represents an alkyl group having 1 to 12 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group, and one or more-CH groups which are not adjacent to each other in the alkyl group2-may be independently substituted with-CH ═ CH-, -O-, -CO-, -COO-, or-OCO-; q represents 0, 1 or 2;
the structure of the compound shown in the general formula K is as follows:
Figure BDA0003087953190000031
in the formula, RK1And RK2The meaning of (A) and RJ1Are identical, i.e. RK1And RK2Each represents an alkyl group having 1 to 12 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group, and one or more-CH groups which are not adjacent to each other in the alkyl group2-may be independently substituted with-CH ═ CH-, -O-, -CO-, -COO-, or-OCO-; rings A, B and C each, independently of one another, denote 1, 4-cyclohexylene or 1, 4-phenylene, k denotes 0 or 1;
the structure of the reactive compound of formula RM is:
Figure BDA0003087953190000032
in the formula, Rm1And Rm2Each independently of the other being a methacrylate or acrylate group, Sm1And Sm2Each represents an alkyl group having 1 to 6 carbon atoms, one or more-CH groups not adjacent to each other in the alkyl group2-may each independently be substituted by-O-or-S-, y or y' represents 0 or 1; rm31、Rm32、Rm33、Rm34、Rm35、Rm36、Rm37And Rm38Each independently of the other represents H、F、Cl、CH3、OCH3Or OCH2CH3。
The structure is shown in general formulas J-1 to J-4, RJ1Represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 11 carbon atoms, an alkenyl group having 2 to 12 carbon atoms, an alkenyloxy group having 2 to 11 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group; preferably an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an alkenyloxy group having 2 to 6 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group; more preferably an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group.
The compounds represented by the general formulae J-1 to J-4 are preferably compounds of the group of the compounds represented by the structural formulae J-1-1 to J-1-11, the structural formulae J-2-1 to J-2-11, the structural formulae J-3-1 to J-3-11, and the structural formulae J-4-1 to J-4-11:
Figure BDA0003087953190000033
Figure BDA0003087953190000041
the compounds represented by the general formulae J-1 to J-4 may be used singly or in combination of two or more. When two or more compounds represented by the general formulae J-1 to J-4 are used, a combination selected from among compounds represented by the structural formulae J-1-1 to J-1-9, the structural formulae J-2-1 to J-2-9, the structural formulae J-3-1 to J-3-9, and the structural formulae J-4-1 to J-4-9 is preferable.
In the compound with the structure shown as the general formula Na, RNa1And RNa2Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 11 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or an alkenyloxy group having 2 to 11 carbon atoms, preferably an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms or an alkenyloxy group having 2 to 6 carbon atoms, more preferably a carbon atom-containing alkyl group, a carbon atom-containing alkoxy group or a carbon atom-containing alkenyloxy groupAn alkyl group having 1 to 5 atoms, an alkenyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 5 carbon atoms. p represents 1, 2 or 3, preferably 1 or 2. ZNa1represents-CH-, -CH ═ CH-2-CH2-、-CH2O-、-CF2O-、-OCH2-or-OCF2-, preferably-CH-, -CH2-CH2-、-CH2O-or-CF2O-, more preferably-CH ═ CH-, -CH-2-CH2-、-CH2O-; x represents 0, 1 or 2, preferably 0 or 1.
The compounds of the general formula Na are preferably compounds of the group of compounds of the formulae Na-1 to Na-5:
Figure BDA0003087953190000051
in the formula, RNa1And RNa2With R in the general formula NaNa1And RNa2The same meaning is indicated, and an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms is preferable.
The compounds of the general formula Na-1 are preferably compounds of the group of the compounds of the formulae Na-1-1 to Na-1-18:
Figure BDA0003087953190000052
Figure BDA0003087953190000061
Figure BDA0003087953190000071
the compounds of the general formula Na-2 are preferably compounds of the group of compounds of the formulae Na-2-1 to Na-2-18:
Figure BDA0003087953190000072
Figure BDA0003087953190000081
Figure BDA0003087953190000091
the compounds of the general formula Na-3 are preferably compounds of the group of compounds of the formulae Na-3-1 to Na-3-18:
Figure BDA0003087953190000092
Figure BDA0003087953190000101
the compounds of the general formula Na-4 are preferably compounds of the group of compounds of the formulae Na-4-1 to Na-4-18:
Figure BDA0003087953190000102
Figure BDA0003087953190000111
Figure BDA0003087953190000121
the compounds of the general formula Na-5 are preferably compounds of the group of compounds of the formulae Na-5-1 to Na-5-18:
Figure BDA0003087953190000122
Figure BDA0003087953190000131
Figure BDA0003087953190000141
one compound represented by the general formula Na may be used alone, or two or more compounds may be used in combination.
In the compound represented by the general formula Nb, RNb1Represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 11 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or an alkenyloxy group having 2 to 11 carbon atoms, preferably an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms or an alkenyloxy group having 2 to 6 carbon atoms, more preferably an alkyl group having 1 to 5 carbon atoms. RNb2Represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 2 to 11 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or an alkenyloxy group having 2 to 11 carbon atoms, preferably an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms or an alkenyloxy group having 2 to 6 carbon atoms, more preferably an alkoxy group having 2 to 5 carbon atoms. q represents 0, 1 or 2, preferably 1 or 2.
The compound represented by the general formula Nb is preferably a compound in the group of compounds represented by the structural formulae Nb-1 to Nb-3:
Figure BDA0003087953190000142
in the formula, RNb1And RNb2The meaning of (A) is as defined for R in the formula NbNb1And RNb2Wherein R isNb1Preferably an alkyl group having 1 to 5 carbon atoms, RNb2An alkoxy group having 2 to 5 carbon atoms is preferable.
The compounds represented by the general formula Nb-1 are preferably compounds from the group of compounds represented by the structural formulae Nb-1-1 to Nb-1-9:
Figure BDA0003087953190000151
the compounds represented by the general formula Nb-2 are preferably compounds from the group of compounds represented by the structural formulae Nb-2-1 to Nb-2-9:
Figure BDA0003087953190000152
Figure BDA0003087953190000161
the compounds represented by the general formula Nb-3 are preferably compounds from the group of compounds represented by the structural formulae Nb-3-1 to Nb-3-9:
Figure BDA0003087953190000162
Figure BDA0003087953190000171
one kind of the compound represented by the general formula Nb may be used alone, or two or more kinds may be used in combination.
In the compounds of the formula K, RK1Represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 11 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or an alkenyloxy group having 2 to 11 carbon atoms, preferably an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms or an alkenyloxy group having 2 to 6 carbon atoms, more preferably an alkyl group having 1 to 5 carbon atoms. Rk2Represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 2 to 11 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or an alkenyloxy group having 2 to 11 carbon atoms, preferably an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms or an alkenyloxy group having 2 to 6 carbon atoms, more preferably an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 2 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms.Rings A and B and C each, independently of one another, denote 1, 4-cyclohexylene or 1, 4-phenylene, and k denotes 0 or 1.
The compounds of the general formula K are preferably compounds of the group of compounds of the formulae K-1 to K-5:
Figure BDA0003087953190000172
in the formula, RK1And RK2In accordance with the meaning indicated in the formula K, wherein RK1Preferably an alkyl group having 1 to 5 carbon atoms, RK2An alkyl group having 1 to 5 carbon atoms, an alkoxy group having 2 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms is preferable.
The compounds of the general formula K-1 are preferably compounds of the group of compounds of the formulae K-1-1 to K-1-17:
Figure BDA0003087953190000181
Figure BDA0003087953190000191
the compounds of the general formula K-2 are preferably compounds of the group of the compounds of the formulae K-2-1 to K-2-18:
Figure BDA0003087953190000192
Figure BDA0003087953190000201
the compounds of the general formula K-3 are preferably compounds of the group of compounds of the formulae K-3-1 to K-3-10:
Figure BDA0003087953190000202
Figure BDA0003087953190000211
the compounds of the general formula K-4 are preferably compounds of the group of compounds of the formulae K-4-1 to K-4-27:
Figure BDA0003087953190000212
Figure BDA0003087953190000221
Figure BDA0003087953190000231
the compounds of the general formula K-5 are preferably compounds of the group of compounds of the formulae K-5-1 to K-5-24:
Figure BDA0003087953190000232
Figure BDA0003087953190000241
the compound represented by the general formula K may be used alone or in combination of two or more.
In the reactive compounds of the formula RM, Rm1And Rm2Each independently of the other represents a methacrylate group or an acrylate group; sm1And Sm2Each represents an alkyl group having 1 to 6 carbon atoms, one or more-CH groups not adjacent to each other in the alkyl group2-may each independently be substituted by-O-S-; y represents 0 or 1, y is preferably 0; rm31、Rm32、Rm33、Rm34、Rm35、Rm36、Rm37And Rm38Each independently of the other represents H, F, Cl, CH3、OCH3Or OCH2CH3Preferably H, F or OCH3。
The compounds of the formula RM are preferably compounds of the group of compounds of the formulae RM-1 to RM-2:
Figure BDA0003087953190000251
in the formula, Rm31、Rm32、Rm33、Rm34、Rm35、Rm36、Rm37And Rm38Each independently of the other represents H, F, Cl, CH3、OCH3Or OCH2CH3Preferably H, F or OCH3。
The compounds of the general formula RM-1 are preferably compounds of the group of compounds of the formulae RM-1-1 to RM-1-27:
Figure BDA0003087953190000252
Figure BDA0003087953190000261
Figure BDA0003087953190000271
Figure BDA0003087953190000281
the compounds of the general formula RM-2 are preferably compounds of the group of compounds of the formulae RM-2-1 to RM-2-27:
Figure BDA0003087953190000282
Figure BDA0003087953190000291
Figure BDA0003087953190000301
Figure BDA0003087953190000311
one compound represented by the general formula RM may be used alone, or two or more compounds may be used in combination.
In the liquid crystal composition of the present invention, the mass of the compound represented by the general formula J-1 to J-4 (first component) is 1 to 50%, the mass of the compound represented by the general formula Na (second component) is 1 to 90%, the mass of the compound represented by the general formula Nb (third component) is 1 to 50%, the mass of the compound represented by the general formula K (fourth component) is 0.1 to 80%, and the mass of the reactive monomer represented by the general formula RM (fifth component) is 0.1 to 20%.
The mass ratio of the compounds represented by the general formulae J-1 to J-4 is preferably in the range of 1 to 35%, more preferably 1 to 20%, relative to the total mass of the composition of the present invention. In the present invention,% means mass% unless otherwise specified.
The proportion of the compound represented by the general formula Na is preferably in the range of 5 to 75%, more preferably 10 to 50%, relative to the total amount of the composition of the present invention.
The proportion of the compound represented by the general formula Nb is preferably in the range of 5 to 40%, more preferably 5 to 35%, relative to the total amount of the composition of the present invention.
The proportion of the compound represented by the general formula K is preferably in the range of 0.1 to 50%, more preferably 0.1 to 30%, relative to the total amount of the composition of the present invention.
The proportion of the compound represented by the general formula RM is preferably in the range of 0.1 to 5%, more preferably 0.1 to 0.5%, relative to the total amount of the composition of the present invention.
The total amount of the compounds represented by the general formulae J-1 to J-4, the general formula Na, the general formula Nb and the general formula K is preferably 80 to 100% relative to the total amount of the liquid crystal composition; further preferably 85 to 100%; further preferably 90 to 100%; further preferably 95 to 100%; further preferably 98-100%; further preferably 99 to 100%; further preferably 99 to 99.9%; further preferably 99 to 99.8%; more preferably 99 to 99.7%.
In the liquid crystal composition proposed by the present invention, in order to sufficiently accelerate the polymerization reaction of the reactive monomer, a combination of compounds represented by the general formulae J-1 to J-4 is preferable.
The liquid crystal composition of the present invention has a nematic phase to isotropic phase transition temperature (Tni) of 50 ℃ to 150 ℃, preferably 60 ℃ to 120 ℃, and more preferably 70 ℃ to 90 ℃.
The liquid crystal composition of the present invention has a refractive index anisotropy (Δ n) at 25 ℃ of 0.05 to 0.20, preferably 0.08 to 0.16, and more preferably 0.09 to 0.12.
The liquid crystal composition of the present invention has a dielectric anisotropy (. DELTA.. di-elect cons.) of-2.5 to-8.5, preferably-2.5 to-6.5, and more preferably-3.0 to-5.0 at 25 ℃.
The liquid crystal composition of the present invention has a rotational viscosity (. gamma.1) at 25 ℃ of 50 to 200 mPas, preferably 55 to 180 mPas, more preferably 60 to 160 mPas, even more preferably 60 to 150 mPas, even more preferably 65 to 140 mPas.
In order to solve the technical problem of the present invention, it is necessary to combine the compounds represented by the general formulae J-1 to J-4 as the first component, the compound represented by the general formula Na as the second component, the compound represented by the general formula Nb as the third component, the compound represented by the general formula K as the fourth component, and the reactive monomer compound represented by the general formula RM) as the fifth component.
In the present invention, substantially free means free of substances other than those not contained in the meaning.
It is not necessary for the person skilled in the art to state that the liquid crystal composition according to the invention may also comprise compounds in which, for example, H, N, O, Cl, F have been replaced by the corresponding isotopes.
In the liquid crystal composition of the present invention, the reactive monomer can be polymerized even in the absence of a polymerization initiator, and a suitable and preferred polymerization method is thermal or photopolymerization, preferably photopolymerization, particularly UV photopolymerization, and if necessary, an initiator for promoting the polymerization reaction, such as benzophenones, acetophenones and the like, commercially available Irgacure651, Irgacure184 and the like, may be added. If an initiator is used, the content ratio by weight in the composition is 0.001 to 3%, preferably 0.001 to 2%, and more preferably 0.001 to 1%.
The liquid crystal composition of the present invention may contain one or more compounds represented by the formulae Y-1 to Y-7 as a stabilizer in an amount of 10ppm to 2000ppm, preferably 30ppm to 1000ppm, and more preferably 50ppm to 500 ppm.
Figure BDA0003087953190000331
The liquid crystal composition containing the reactive monomer is polymerized by UV light irradiation, thereby endowing the liquid crystal with alignment capability, and further being used in a liquid crystal display device for regulating and controlling the light transmission amount by using the liquid crystal birefringence of the composition.
The liquid crystal display device manufactured by using the liquid crystal composition has no or few display defects such as Image Sticking (IS), has high Voltage Holding Ratio (VHR) and excellent reliability, and IS particularly suitable for PSVA or PSA mode of TFT liquid crystal display devices.
In addition, in the manufacturing process of the liquid crystal display device based on the ODF method, the optimum amount of liquid crystal to be injected needs to be dropped according to the size of the liquid crystal display device, and the liquid crystal composition proposed by the present invention has little influence of a sudden pressure change and an impact in a dropping device generated when the liquid crystal is dropped, and can stably continue dropping the liquid crystal for a long time, so that the yield of the liquid crystal display device can be kept high. In particular, in a small liquid crystal display device commonly used in a smart phone which is recently popular, it is difficult to control the deviation from the optimum value within a certain range because the optimum liquid crystal injection amount is small, but a stable liquid crystal discharge amount can be realized even in a small liquid crystal display device by using the liquid crystal composition proposed by the present invention.
According to the liquid crystal composition provided by the invention, the polymerization reaction speed of the reactive monomer IS fast enough, and the liquid crystal display device which has no or little display defects such as IS caused by the change of the pretilt angle, has high VHR and excellent reliability can be obtained. In conclusion, the liquid crystal composition of the present invention can significantly improve the production efficiency of a PSVA type or PSA type liquid crystal display device, and thus has an extremely high industrial utility value.
The liquid crystal composition provided by the invention is not only suitable for the occasion of producing a liquid crystal display device of a PSVA type or a PSA type, but also suitable for producing a liquid crystal display device of a SAVA (self-aligned vertical alignment) type which does not have an alignment film as a characteristic.
The liquid crystal composition provided by the invention is particularly suitable for liquid crystal display devices for active matrix driving. Can be used for liquid crystal display devices such as PSVA, PSA, PS-IPS, PS-FFS, NPS, SAVA, PSLC, GHLC and the like.
The liquid crystal display device of the present invention preferably has the following features: a first substrate and a second substrate disposed opposite to each other; a common electrode provided on the first substrate or the second substrate; a pixel electrode provided on the first substrate or the second substrate and having a Thin Film Transistor (TFT); and a liquid crystal layer containing a liquid crystal composition and provided between the first substrate and the second substrate. An alignment film for controlling the alignment direction of liquid crystal molecules may be provided on the opposite side of at least one of the first substrate and/or the second substrate so as to be in contact with the liquid crystal layer, as necessary. As the alignment film, a vertical alignment film, a horizontal alignment film, or the like can be appropriately selected depending on the driving mode of the liquid crystal display device, and a known alignment film such as a rubbing alignment film (for example, polyimide) or a photo alignment film (for example, decomposed polyimide) can be used. Further, a Color Filter (CF) may be provided on the first substrate or the second substrate as appropriate, or a CF may be provided on the pixel electrode or the common electrode.
As the 2 substrates of the liquid crystal cell used in the liquid crystal display device proposed by the present invention, a transparent material having flexibility such as glass or plastic may be used, or one of the substrates may be an opaque material such as silicon. The transparent substrate having a transparent electrode layer can be obtained by, for example, sputtering Indium Tin Oxide (ITO) on a transparent substrate such as a glass plate. The CF can be produced by, for example, a pigment dispersion method, a printing method, an electrodeposition method, a dyeing method, or the like. The method of producing CF by the pigment dispersion method is exemplified by applying a curable coloring composition for CF onto the transparent substrate, performing patterning treatment, and then curing the composition by heating or light irradiation. This process is performed for 3 colors of red, green, and blue, respectively, so that a pixel portion for CF can be manufactured. Further, a pixel electrode provided with an active element such as a TFT, a thin film diode, a metal insulator, or a metal resistivity element may be provided on the substrate. Preferably, the first substrate and the second substrate are opposed to each other so that the common electrode and the pixel electrode layer are located inside.
The interval between the first substrate and the second substrate may be adjusted by the spacer. In this case, the thickness of the light control layer is preferably adjusted to 0.5 to 50 μm, more preferably 0.5 to 30 μm, still more preferably 1.0 to 20 μm, yet more preferably 1.0 to 10 μm, and yet more preferably 1.0 to 5 μm. When a polarizing plate is used, the product of the refractive index anisotropy Δ n of the liquid crystal and the cell thickness d is preferably adjusted so as to maximize the transmittance. In the case of two polarizing plates, the polarizing axes of the polarizing plates may be adjusted so that the viewing angle and the contrast are improved. Further, a retardation film for enlarging the viewing angle can be used. Examples of the spacer used include glass particles, plastic particles, alumina particles, and photoresist materials. Then, a sealant such as an epoxy-based thermosetting composition is screen-printed on the substrates as necessary in a form provided with a liquid crystal injection port, the substrates are bonded to each other, and the sealant is thermally cured by heating. As a method for sandwiching the liquid crystal composition between 2 substrates, a general vacuum injection method, ODF method, or the like can be used.
As a method for polymerizing the reactive monomer contained in the liquid crystal composition proposed by the present invention, it is desirable to polymerize the reactive monomer at an appropriate polymerization rate in order to obtain good liquid crystal alignment performance, and therefore, a method of polymerizing the reactive monomer by irradiating active energy rays such as ultraviolet rays or electron beams alone or in combination or in sequence is preferable. In the case of using ultraviolet rays, either a polarized light source or an unpolarized light source may be used. In addition, in the case of polymerizing the liquid crystal composition in a state of being sandwiched between 2 substrates, at least the substrate on the irradiation surface side must have appropriate transparency to the active energy ray. In addition, the following method may also be used: after polymerizing only a specific portion using a mask at the time of light irradiation, the orientation state of the unpolymerized portion is changed by changing the conditions such as an electric field, a magnetic field, or temperature, and further, the polymerization is performed by irradiation with an active energy ray. In particular, when ultraviolet exposure is performed, it is preferable to perform ultraviolet exposure while applying a direct current electric field or an alternating current electric field to the liquid crystal composition. It should be noted that the applied alternating electric field is preferably alternating current with a frequency of 1Hz to 10kHz, more preferably 30Hz to 10kHz, and still more preferably 60Hz to 1kHz, and the voltage is selected according to the desired pretilt angle of the liquid crystal display element. That is, the pretilt angle of the liquid crystal display device may be controlled by an applied voltage. In the liquid crystal display device of the PSVA type or PSA type, the pretilt angle is preferably controlled to 80 degrees to 89.9 degrees, and more preferably controlled to 85 degrees to 89.5 degrees from the viewpoints of alignment stability and contrast.
In the liquid crystal display device of the PSVA type or PSA type, when the reactive monomer IS not polymerized and remains after the device IS manufactured, burn-In (IS) occurs. The amount of the residual reactive monomer is preferably 30ppm or less, more preferably 20ppm or less, more preferably 10ppm or less, and particularly preferably 0 or less as the lower limit of detection.
The temperature at the time of irradiation with active energy rays such as ultraviolet rays or electron beams used in the polymerization reaction of the reactive monomer contained in the liquid crystal composition of the present invention is not particularly limited. For example, when the liquid crystal composition of the present invention is applied to a liquid crystal display device having a substrate with an alignment film, it is preferable that the liquid crystal composition is maintained in a liquid crystal state in a temperature range. Namely, the polymerization is preferably carried out at 15 to 60 ℃ and more preferably at 20 to 50 ℃.
As a light source for generating ultraviolet rays, a metal halide lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, or the like can be used. Preferably an ultra-high pressure UV lamp, a fluorescent UV lamp from TOSHIBA. The wavelength of the ultraviolet light to be irradiated is preferably ultraviolet light whose wavelength range is not in the absorption wavelength range of the liquid crystal composition, and the ultraviolet light is preferably filtered and used as necessary. The intensity of the ultraviolet ray to be irradiated is preferably 0.1mW/cm2～100W/cm2More preferably 0.5mW/cm2～50W/cm2More preferably 0.5mW/cm2～30W/cm2More preferably 0.5mW/cm2～20W/cm2More preferably 1mW/cm2～10W/cm2. The energy of the ultraviolet ray to be irradiated may be appropriately adjusted, and is preferably 10mJ/cm2To 500J/cm2More preferably 10mJ/cm2To 300J/cm2More preferably 10mJ/cm2To 200J/cm2More preferably 100mJ/cm2To 200J/cm2More preferably 100mJ/cm2To 100J/cm2More preferably 200mJ/cm2To 100J/cm2。
The invention has the advantages that:
the liquid crystal composition of the present invention has a negative dielectric anisotropy (Δ ∈), exhibits a large refractive index anisotropy (Δ n), a high nematic phase-isotropic liquid phase transition temperature (Tni), a small rotational viscosity (γ 1), and has a sufficiently high polymerization reaction rate of a reactive monomer. The liquid crystal display using the liquid crystal composition of the present invention has a small residual amount of the reactive monomer, and thus shows a small change in the pretilt angle before and after driving, a high Voltage Holding Ratio (VHR), no or suppressed display defects such as burn-in, and excellent display quality.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples.
In the compositions of comparative examples and examples below, "%" represents "% by mass".
All concentrations in this application are given in weight percent and refer to the corresponding compositions and composition components, unless explicitly stated otherwise.
Unless explicitly stated otherwise, all temperatures indicated in this application, such as the clearing point Tni, are expressed in degrees celsius (° c).
In the examples, the abbreviations for the compounds described in the present application are used for all descriptions of the compounds.
In the examples, the physical parameter characteristics tested were as follows:
tni: nematic phase-isotropic liquid phase transition temperature (° c);
Δ n: refractive index anisotropy at 25 degrees Celsius (C.);
Δ ε: dielectric anisotropy at 25 degrees Celsius (C.);
γ 1: rotational viscosity (mPas) at 25 ℃ (. degree.C.).
The manufacturing method and the evaluation method of the liquid crystal display device provided by the invention are as follows:
first, a polyimide inducing vertical alignment was coated on the surface of a substrate containing an ITO layer to form an alignment film, and then the alignment film was subjected to a rubbing process, and a liquid crystal cell was formed between two ITO substrates at an interval of 4.0 μm thickness. A liquid crystal composition containing a reactive monomer is vacuum-injected into the liquid crystal cell. Then, ultraviolet rays were continuously irradiated using a high-pressure mercury lamp while applying a voltage of 60Hz and 15V to the liquid crystal cell of the liquid crystal composition containing the reactive monomer. At this time, the illuminance measured under the condition of adjusting the central wavelength to 365nm was 100mW/cm2Cumulative light quantity of irradiation 20J/cm2. The ultraviolet irradiation conditions were set as irradiation conditions a. The liquid crystal molecules in the liquid crystal cell are given a pretilt angle by the irradiation condition a. Then, a fluorescent UV lamp was used under the condition of being adjusted to a central wavelength of 313nmThe measured illumination was 5mW/cm2Further, the cumulative light quantity of irradiation was 10J/cm2The ultraviolet light (2) was used to obtain a liquid crystal display element. The ultraviolet irradiation conditions were set as irradiation conditions B. The residual amount of the reactive monomer in the liquid crystal cell that has not reacted under the irradiation condition a is reduced by the irradiation condition B.
The liquid crystal cell after the ultraviolet irradiation was subjected to a change test of the pretilt angle to evaluate poor screen burn-in display due to the change of the pretilt angle. First, the pretilt angle of the liquid crystal display element was measured as an initial pretilt angle. Then, the liquid crystal display element was irradiated with a backlight for 12 hours while applying a voltage of 30V at 60Hz, and then the pretilt angle was measured as the pretilt angle after the test. The value obtained by subtracting the pre-tilt angle after the test from the initial pre-tilt angle measured was defined as the pre-tilt angle change amount (°). The pretilt angle test apparatus uses OPTIPRO micro manufactured by SHINTECK. As the pretilt angle change amount approaches 0 °, the probability of occurrence of poor burn-in display due to pretilt angle change is low, and as the pretilt angle change amount is 0.3 ° or more, the probability of occurrence of poor burn-in display due to pretilt angle change is high.
The residual amounts (ppm) of the reactive monomers in the liquid crystal display element after the irradiation with ultraviolet rays under the irradiation condition a and the irradiation condition B were measured. The method for measuring the residual amount of the reactive monomer will be described. First, an acetonitrile solution containing a liquid crystal composition, a polymer and an unreacted reactive monomer obtained by decomposing a liquid crystal display element was analyzed by high performance liquid chromatography, and peak areas of the respective components were measured. The amount of the remaining reactive monomer is determined from the ratio of the peak area of the liquid crystal compound to the peak area of the unreacted reactive monomer as an index. The residual amount of reactive monomer is determined from this value and the amount of reactive monomer initially added. The limit of detection of the residual amount of the reactive monomer was 30 ppm. When the reactive monomer remains after the ultraviolet irradiation under the irradiation conditions a and B, the possibility of display failure due to the remaining reactive monomer becomes high. The Voltage Holding Ratio (VHR) of the liquid crystal display device after the irradiation with the ultraviolet rays under the above irradiation condition a and the irradiation condition B was measured under the conditions of a frequency of 60Hz, a voltage of 5V, and a temperature of 60 ℃.
The liquid crystal composition was prepared and evaluated as follows:
liquid crystal compositions Host R1 to Host R4, Host 01 to Host 10 were prepared and physical parameters thereof were measured. The composition of the liquid crystal composition and the physical parameters thereof are shown in table 1.
Wherein the Host R1-Host R4 contains terphenyl compounds R-1 and R-2 as comparative liquid crystal compositions, and the Host 01 to Host 10 are composed of compounds with structures shown by J, Na, Nb and K, and the like.
Figure BDA0003087953190000361
TABLE L compositions (% by mass) and physical parameters of the liquid crystal compositions Host R1 to Host R4, Host 0l to Host 10
HostRl HostR2 HostR3 Host R4 Host01 Host02 Host03 Host04 Host05 Host06 Host07 Host08 Host09 Hostl0
J-1-5 2.5 2
J-2-4 7 3 5 6 7 3
J-2-5 8 11 3 2.5 3 3
J-3-5 2.5 3 2.5 2
J-3-9 2.5 3 2.5 2 2.5 3
J-4-5 3 3.5 2.5 2.5
J-4-9 3 3.5 2.5 2.5 3 3.5
Na-1-10 4 4 6 5 6 5 6 5 6 5 6 5 6 5
Na-2-14 7 7 8 8 12 7 11 11 12 7 11 11 12 7
Na-3-13 7 7 8 9 8 11 8 9 8 11 8 9 8 11
Na-4-10 6
Na-4-11 15 15 8 13 10 15 10 11 10 15 10 11 10 15
Nb-2-1 5 5 5 5 7 3 5 6
Nb-2-2 10 10 10 9 8 11 10 8 10 8 8 11
K-1-1 17 16 20 20 11 11 18 19 11 11 18 19 11 11
K-1-5 8 8
K-3-4 3 2.5 2 2.5 2
K-2-10 24 24 15 1 5 27 25.5 24 24 27 25.5 24 24 27 25.5
R-1 4 6 3 4
R-2 4 6 3 4 3 3 3 2.5 3 3
100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0
TNI/℃ 76 81 77 78 75 75 75 74 73 74 76 75 76 77
△n 0.110 0.116 0.097 0.100 0.110 0.110 0.103 0.100 0.108 0.108 0.100 0.098 0.108 0.107
△￡ -3.1 -3.2 -3.2 -3.0 -3.4 -3.6 -3.2 -3.2 -3.0 -3.2 -3.1 -3.1 -3.1 -3.5
Y1/mPa·s 89 91 86 85 90 93 86 85 81 85 84 83 87 93
K11/pN 14.6 15.4 14.6 14.8 14.0 13.8 13.8 13.8 13.3 13.2 13.9 13.7 13.9 14.1
K33/pN 14.5 15.3 13.5 13.7 14.8 14.8 14.3 14.3 14.2 14.3 14.4 14.2 14.7 14.9
Comparative examples l to 4 and examples l to 10:
the prepared liquid crystal compositions Host R1 to Host R4, Host 0l to Host 10 were added with 0.3% of the reactive monomer represented by RM-l-2 or RM-l-16 in a compositional ratio to prepare liquid crystal compositions containing the reactive monomer and subjected to various evaluations as comparative examples l to 4 and examples l to 10 as shown in Table 2.
Figure BDA0003087953190000371
TABLE 2 compositions and Properties of comparative examples 1 to 4 and examples 1 to 10
Figure BDA0003087953190000381
From the results in the above table, it can be confirmed that the pretilt angle variation amount is very small and VHR is very high in examples 1 to 10. On the other hand, in comparative examples 1 and 2, the amount of the residual reactive monomer was large, VHR was low, and the amount of change in pretilt angle was large, indicating that display defects such as burn-in were likely to occur, while in comparative examples 3 and 4, although the amount of the residual reactive monomer was small, VHR was low, and the amount of change in pretilt angle was also large, indicating that display defects such as burn-in were also likely to occur. The results of comparative examples are all inferior to those of examples in the comparative analysis of the pretilt angle change amount actually evaluated. Thus, it is shown that examples 1 to 10 are excellent liquid crystal compositions which solve the technical problems of the present invention, and excellent liquid crystal display devices can be obtained.
From the above results, it was confirmed that the liquid crystal composition of the present invention has a sufficiently high polymerization rate of the reactive monomer, and is most suitable for PSA-type or PSVA-type liquid crystal display devices which are free from display defects such as burn-in due to changes in pretilt angle, have a high VHR, and are excellent in reliability.

Claims (15)

1. A liquid crystal composition characterized by: the liquid crystal composition contains one or more than two compounds shown in general formulas J-1 to J-4, one or more than two compounds shown in general formula Na, one or more than two compounds shown in general formula Nb, one or more than two compounds shown in general formula K and reactive compounds shown in general formula RM;
compounds of formulae J-1 to J-4 are:
Figure FDA0003087953180000011
in the formula, RJ1Represents an alkyl group having 1 to 12 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group, one or more-CH groups not adjacent to the alkyl group2-may be independently substituted with-CH ═ CH-, -O-, -CO-, -COO-, or-OCO-;
the compound represented by the general formula Na is:
Figure FDA0003087953180000012
in the formula, RNa1And RNa2Respectively represents an alkyl group having 1 to 12 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group, and one or more-CH groups which are not adjacent to each other in the alkyl group2-may be independently substituted with-CH ═ CH-, -O-, -CO-, -COO-, or-OCO-; zNa1Represents- -CH- -or- -CH2-CH2-、-CH2O-、-CF2O-、-OCH2-or-OCF2-; x represents 0, 1, 2 or 3; p represents 1, 2 or 3;
the compound represented by the general formula Nb is:
Figure FDA0003087953180000013
in the formula, RNb1And RNb2Each represents an alkyl group having 1 to 12 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group, and one or more-CH groups which are not adjacent to each other in the alkyl group2-may be independently substituted with-CH ═ CH-, -O-, -CO-, -COO-, or-OCO-; q represents 0, 1 or 2;
the compound represented by the general formula K is:
Figure FDA0003087953180000014
in the formula, RK1And RK2Each represents an alkyl group having 1 to 12 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group, and one or more-CH groups which are not adjacent to each other in the alkyl group2-may be independently substituted with-CH ═ CH-, -O-, -CO-, -COO-, or-OCO-; rings A, B and C each, independently of one another, denote 1, 4-cyclohexylene or 1, 4-phenylene, k denotes 0 or 1;
the reactive compound of formula RM is:
Figure FDA0003087953180000021
in the formula, Rm1And Rm2Each independently of the other being a methacrylate or acrylate group, Sm1And Sm2Each represents an alkyl group having 1 to 6 carbon atoms, one or more-CH groups not adjacent to each other in the alkyl group2-may each independently be substituted by-O-or-S-, y or y' represents 0 or 1, Rm31、Rm32、Rm33、Rm34、Rm35、Rm36、Rm37And Rm38Each independently of the other represents H, F, Cl, CH3、OCH3Or OCH2CH3。
2. The liquid crystal composition according to claim 1, wherein: the structure is shown in general formulas J-1 to J-4, RJ1Represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 11 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or an alkenyloxy group having 2 to 11 carbon atoms, a cyclopentyl group, a cyclobutyl group or a cyclopropyl group;
in the compound with the structure shown as the general formula Na, RNa1And RNa2Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 11 carbon atoms, or a carbon atomAn alkenyl group having a sub-number of 2 to 12 or an alkenyloxy group having a carbon number of 2 to 11; zNa1represents-CH-, -CH ═ CH-2-CH2-、-CH2O-or-CF2O-; x represents 0 or 1; p represents 1 or 2;
in the compound represented by the general formula Nb, RNb1And RNb2Each represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 11 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or an alkenyloxy group having 2 to 11 carbon atoms; q represents 1 or 2;
in the compounds of the formula K, RK1And Rk2Each represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 11 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or an alkenyloxy group having 2 to 11 carbon atoms;
in the reactive compounds of the general formula RM, y is 0, Rm31、Rm32、Rm33、Rm34、Rm35、Rm36、Rm37And Rm38Each independently of the other H, F or OCH3。
3. The liquid crystal composition according to claim 2, characterized in that: the compounds of formulae J-1 to J-4 are selected from the group consisting of compounds of formulae J-1-1 to J-1-11, formulae J-2-1 to J-2-11, formulae J-3-1 to J-3-11, and formulae J-4-1 to J-4-11:
Figure FDA0003087953180000031
Figure FDA0003087953180000041
4. the liquid crystal composition according to claim 2, characterized in that: the compound represented by the general formula Na is selected from compounds represented by the structural formulas Na-1 to Na-5:
Figure FDA0003087953180000042
Figure FDA0003087953180000051
5. the liquid crystal composition according to claim 4, wherein: the compound represented by the general formula Na-1 is selected from the group consisting of compounds represented by the structural formulae Na-1-1 to Na-1-18:
Figure FDA0003087953180000052
Figure FDA0003087953180000061
the compound represented by the general formula Na-2 is selected from the group consisting of compounds represented by the structural formulae Na-2-1 to Na-2-18:
Figure FDA0003087953180000062
Figure FDA0003087953180000071
Figure FDA0003087953180000081
the compound represented by the general formula Na-3 is selected from the group consisting of compounds represented by the structural formulae Na-3-1 to Na-3-18:
Figure FDA0003087953180000082
Figure FDA0003087953180000091
Figure FDA0003087953180000101
the compound represented by the general formula Na-4 is selected from the group consisting of compounds represented by the structural formulae Na-4-1 to Na-4-18:
Figure FDA0003087953180000102
Figure FDA0003087953180000111
the compound represented by the general formula Na-5 is selected from the group consisting of compounds represented by the structural formulae Na-5-1 to Na-5-18:
Figure FDA0003087953180000112
Figure FDA0003087953180000121
Figure FDA0003087953180000131
6. the liquid crystal composition according to claim 2, characterized in that: the compound represented by the general formula Nb is selected from compounds represented by structural formulas Nb-1 to Nb-3:
Figure FDA0003087953180000132
Figure FDA0003087953180000141
7. the liquid crystal composition according to claim 6, wherein: the compound represented by the general formula Nb-1 is selected from compounds represented by structural formulas Nb-1-1 to Nb-1-9:
Figure FDA0003087953180000142
the compound represented by the general formula Nb-2 is selected from compounds represented by structural formulas Nb-2-1 to Nb-2-9:
Figure FDA0003087953180000151
the compound represented by the general formula Nb-3 is selected from compounds represented by structural formulas Nb-3-1 to Nb-3-9:
Figure FDA0003087953180000152
Figure FDA0003087953180000161
8. the liquid crystal composition according to claim 2, characterized in that: the compound represented by the general formula K is selected from compounds represented by structural formulas K-1 to K-5:
Figure FDA0003087953180000162
9. the liquid crystal composition according to claim 8, wherein: the compound represented by the general formula K-1 is selected from compounds represented by structural formulas K-1-1 to K-1-17:
Figure FDA0003087953180000171
Figure FDA0003087953180000181
the compound represented by the general formula K-2 is selected from compounds represented by structural formulas K-2-1 to K-2-18:
Figure FDA0003087953180000182
Figure FDA0003087953180000191
the compound represented by the general formula K-3 is selected from compounds represented by structural formulas K-3-1 to K-3-10:
Figure FDA0003087953180000192
Figure FDA0003087953180000201
the compound represented by the general formula K-4 is selected from compounds represented by structural formulas K-4-1 to K-4-27:
Figure FDA0003087953180000202
Figure FDA0003087953180000211
Figure FDA0003087953180000221
the compound represented by the general formula K-5 is selected from compounds represented by structural formulas K-5-1 to K-5-24:
Figure FDA0003087953180000222
Figure FDA0003087953180000231
10. the liquid crystal composition according to claim 2, characterized in that: the compound represented by the general formula RM is selected from compounds represented by general formulas RM-1 to RM-2:
Figure FDA0003087953180000232
11. the liquid crystal composition according to claim 10, wherein: the compound represented by the general formula RM-1 is selected from the group consisting of compounds represented by the structural formulae RM-1-1 to RM-1-27:
Figure FDA0003087953180000241
Figure FDA0003087953180000251
Figure FDA0003087953180000261
Figure FDA0003087953180000271
the compound represented by the general formula RM-2 is selected from the group consisting of compounds represented by the structural formulae RM-2-1 to RM-2-27:
Figure FDA0003087953180000272
Figure FDA0003087953180000281
Figure FDA0003087953180000291
Figure FDA0003087953180000301
12. the liquid crystal composition according to claim 1, wherein: in the liquid crystal composition, the mass of the compounds represented by general formulas J-1 to J-4 is 1-50%, the mass of the compounds represented by general formula Na is 1-90%, the mass of the compounds represented by general formula Nb is 1-50%, the mass of the compounds represented by general formula K is 0.1-80%, and the mass of the reactive monomers represented by general formula RM is 0.1-10%; the sum of the mass of the compounds represented by the general formulas J-1 to J-4, the general formula Na, the general formula Nb and the general formula K is 80-100%.
13. The liquid crystal composition according to claim 3, wherein: when the compounds represented by the general formulas J-1 to J-4 are two or more, the combination of the compounds represented by the structural formulas J-1-1 to J-1-9, the structural formulas J-2-1 to J-2-9, the structural formulas J-3-1 to J-3-9 and the structural formulas J-4-1 to J-4-9 is adopted.
14. The liquid crystal composition according to claim 1, wherein: the liquid crystal composition also contains one or more than two stabilizers, and the mass content of the stabilizers is 10ppm to 2000 ppm; the structural formula of the stabilizer is shown as Y-1 to Y-7:
Figure FDA0003087953180000311
15. a liquid crystal display, characterized by: is prepared by using the liquid crystal composition as defined in any one of claims 1 to 14; the liquid crystal display is a liquid crystal display device for driving an active matrix, and comprises PSVA, PSA, PS-IPS, PS-FFS, NPS, SAVA, PSLC and GHLC type liquid crystal display devices.
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