Liquid crystal composition and application thereof

Abstract

The invention discloses a liquid crystal composition and a liquid crystal display element, the liquid crystal composition comprises one or more first compounds, and the first compounds have a structure as shown in a general formula I. According to the liquid crystal composition, the general formula I is added into the liquid crystal composition, so that a PI alignment layer is not needed; the liquid crystal composition can be vertically aligned along the surface of a liquid crystal display box, and has excellent alignment capability.

Description

Technical Field

[0001] The present application relates to the technical field of liquid crystal materials, and in particular to a liquid crystal composition and its application. Background Art

[0002] Liquid crystal materials are widely used in various display devices, including but not limited to mobile phones, televisions, and computers. Liquid crystal plays the role of a "light valve" in a thin film transistor liquid crystal display (TFT-LCD), which controls the amount of backlight transmitted to adjust the brightness of the display device.

[0003] Traditional vertical alignment (VA) liquid crystal display devices are composed of a thin film transistor (TFT) substrate, a color filter (CF) substrate, a polyimide (PI) alignment layer and a liquid crystal composition sandwiched therebetween. However, adding a PI alignment layer increases the number of PI process steps, resulting in lower production efficiency. Summary of the invention

[0004] In view of this, the present application provides a liquid crystal composition and its application to achieve vertical alignment of liquid crystal materials without a PI alignment layer, aiming to improve the problem of reduced production efficiency due to the need to add a PI alignment layer to achieve vertical alignment.

[0005] In a first aspect, an embodiment of the present application provides a liquid crystal composition, wherein the liquid crystal composition comprises one or more compounds represented by Formula I and Formula II;

[0006]

[0007] in,

[0008] R1 is selected from H, an alkyl or alkoxy group having 1 to 10 carbon atoms, an alkenyl or alkenyloxy group having 2 to 10 carbon atoms, a cycloalkane having 3 to 10 carbon atoms, or an aromatic ring having 3 to 10 carbon atoms, any one or non-adjacent CH2 groups in the R1 group may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the group may be substituted by F, Cl, Br or I;

[0009] Z1, Z2 and Z3 are each independently selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, -CH=CH- or -C≡C-, or an alkylene group of 1 to 10 carbon atoms, or an alkenylene group of 2 to 10 carbon atoms or an alkynyl group of 2 to 10 carbon atoms, and any non-adjacent CH2 group may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, -CH=CH- or -C≡C-, and one or more H in the group may be substituted by F, Cl, Br or I;

[0010] L is selected from H, F, Cl, CF3, Sp, an alkyl or alkoxy group having 1-10 carbon atoms, an alkenyl or alkenyloxy group having 2-10 carbon atoms, an alkynyl or alkynyloxy group having 2-10 carbon atoms, a cycloalkane having 3-10 carbon atoms, or an aromatic ring having 3-10 carbon atoms, any one or non-adjacent CH2 groups in the L group may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the group may be substituted by F, Cl, Br or I;

[0011] Each independently selected from in Any non-adjacent -CH2- in can be replaced by -O-;

[0012] The H in the benzene ring of the general formula I may be independently substituted by any F, Cl, Br, CN, SCN, NCS, or an alkyl or alkoxy group having 1 to 10 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 10 carbon atoms, or an alkynyl or alkynyloxy group having 2 to 10 carbon atoms;

[0013] n is selected from 1, 2 or 3;

[0014] a and b are each independently selected from 0, 1, 2 or 3, and a+b≥1;

[0015] c and d are each independently selected from 0, 1 or 2;

[0016] p and q are each independently selected from 0, 1 or 2;

[0017] Sp is selected from ether, alkyl, alkoxy, alkenyl, alkenyloxy or polymerizable groups with or without branches, and at least one Sp in the general formula I represents a polymerizable group;

[0018] T is selected from a group that plays an anchoring role with the substrate.

[0019] Optionally, in some embodiments of the present application, n is selected from 1 or 2, and the group T that acts as an anchor to the substrate is selected from the general formula III:

[0020]

[0021] in,

[0022] R4, R5 and R6 are each independently selected from H, OH, F, Cl, Br, CN, SCN, NCS, or an alkyl or alkoxy group having 1 to 10 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 10 carbon atoms, or an alkynyl or alkynyloxy group having 2 to 10 carbon atoms; wherein the terminal groups of R4, R5 and R6 may be substituted by OH, CN or CF3, and one or more CH2 groups in the R4, R5 and R6 groups may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C- so that the heteroatom is not directly bonded, and one or more H in the group may be substituted by F, Cl, Br, I. At least one terminal group in the group selected from R4, R5 and R6 is a hydroxyl group;

[0023] k is an integer selected from 0 to 10;

[0024] Z4 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, or an alkylene group of 1-10 carbon atoms, or an alkenylene group of 2-10 carbon atoms or an alkynyl group of 2-10 carbon atoms, and any non-adjacent CH2 group can be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, and one or more H in the group can be replaced by F, Cl, Br, I.

[0025] Optionally, in some embodiments of the present application, Sp is selected from Formula IV to Formula V:

[0026]

[0027] in,

[0028] m is an integer selected from 0 to 10;

[0029] Z5 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, or an alkylene group of 1-10 carbon atoms, or an alkenylene group of 2-10 carbon atoms or an alkynyl group of 2-10 carbon atoms, and any non-adjacent CH2 group can be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, and one or more H in the group can be replaced by F, Cl, Br, I.

[0030] Optionally, in some embodiments of the present application, the general formula I is selected from the following subformulas I-1 to I-26:

[0031]

[0032]

[0033] in,

[0034] n is selected from 1 or 2;

[0035] a, b are each independently selected from 1 or 2;

[0036] Sp is selected from ether, alkyl, alkoxy, alkenyl, alkenyloxy or polymerizable groups with or without branches, and at least one polymerizable group represented by Sp is present in any of Formulas I-1 to I-26;

[0037] T is selected from a group that plays an anchoring role with the substrate;

[0038] R1 is selected from H, alkyl or alkoxy having 1-10 carbon atoms, alkenyl or alkenyloxy having 2-10 carbon atoms, cycloalkane having 3-10 carbon atoms or aromatic ring having 3-10 carbon atoms, any one or non-adjacent CH2 groups in the R1 group can be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the group can be replaced by F, Cl, Br or I.

[0039] Optionally, in some embodiments of the present application, the general formula I is selected from compounds of I-1-1 to I-26-4:

[0040]

[0041]

[0042]

[0043]

[0044]

[0045]

[0046]

[0047] Optionally, in some embodiments of the present application, the liquid crystal composition further comprises one or more second compounds represented by general formula II;

[0048]

[0049] in,

[0050] Each independently selected from

[0051] R2 and R3 are each independently selected from H, F, Cl, Br, CN, SCN, NCS, or an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl or alkenyloxy group having 2-10 carbon atoms, or an alkynyl or alkynyloxy group having 2-10 carbon atoms; wherein the terminal groups of R2 and R3 may be substituted by CN or CF3, and one or more CH2 groups in the R2 and R3 groups may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C- and the heteroatom is not directly bonded, or one or more H in the alkyl or alkoxy group having 1-10 carbon atoms, the alkenyl or alkenyloxy group having 2-10 carbon atoms, the alkynyl or alkynyloxy group having 2-10 carbon atoms is substituted by F, Cl, Br, or I.

[0052] Optionally, in some embodiments of the present application, the general formula II is selected from the following compounds II-1 to II-12:

[0053]

[0054] Optionally, in some embodiments of the present application, the liquid crystal composition further comprises one or more third compounds represented by general formula VI;

[0055]

[0056] Among them, R7, R8, R9 and R 10 Each independently represents H, F, OH, CF3, or an alkyl or alkoxy group having 1 to 5 carbon atoms, or an alkenyl or alkenyloxy group having 1 to 5 carbon atoms, or an alkyl or alkoxy group having 1 to 5 carbon atoms, in which one or more H in the alkenyl or alkenyloxy group having 1 to 5 carbon atoms is substituted by F, Cl, Br, or I;

[0057] Sp is selected from ether, alkyl, alkoxy, alkenyl, alkenyloxy or polymerizable groups with or without branches, and at least one Sp in the general formula VI represents a polymerizable group;

[0058] a and b are each independently selected from 0, 1, 2 or 3, and a+b≧1.

[0059] Optionally, in some embodiments of the present application, the mass percentage of the compound represented by Formula I in the liquid crystal composition is 0.01% to 1.50%.

[0060] Optionally, in some embodiments of the present application, the mass percentage of the second compound represented by Formula II in the liquid crystal composition is 5% to 70%.

[0061] Optionally, in some embodiments of the present application, the mass percentage of the third compound represented by Formula VI in the liquid crystal composition is 0.01% to 1.50%.

[0062] In a second aspect, an embodiment of the present application provides a liquid crystal display element, including:

[0063] An electrode group is formed on one or both of a pair of substrates disposed opposite to each other;

[0064] A plurality of active elements connected to the electrode group;

[0065] RGB color resist, wherein the R color resist contains diketopyrrolopyrrole or other organic pigment compounds, and the water-soluble pigment contained in the R color resist is not higher than 1.5%, and 90% of the pigment particles are in the range of 0-100 nm; and

[0066] The liquid crystal composition is sandwiched between the pair of substrates;

[0067] The liquid crystal composition comprises one or more first compounds represented by general formula I, one or more second compounds represented by general formula II, or one or more third compounds represented by general formula VI.

[0068] In a third aspect, an embodiment of the present application provides an application of a liquid crystal composition, wherein the liquid crystal composition is applied to a liquid crystal medium, a VA, a PSA, a PS-VA, a PVA or a MVA electro-optical display element.

[0069] The present application adds the general formula I into the liquid crystal composition, and can realize the vertical alignment of the liquid crystal composition along the surface of the liquid crystal display box without the need for a PI alignment layer, and has excellent alignment ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0071] Figure 1 It is a flow chart of the method for preparing the liquid crystal composition provided in the embodiment of the present application. DETAILED DESCRIPTION

[0072] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0074] In this application, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. In addition, in the description of this application, the term "including" means "including but not limited to". The terms first, second, third, etc. are used only as labels and do not impose numerical requirements or establish an order.

[0075] In this application, "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0076] In the present application, "at least one" means one or more, and "plurality" means two or more. "One or more", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple, respectively.

[0077] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0078] In this application, "optionally", "optional", and "optional" mean optional, that is, any one of the two parallel solutions of "yes" or "no". If multiple "options" appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" is independent. In this application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0079] The present application provides a liquid crystal composition and a liquid crystal display element. In order to make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0080] In the present application, "substituted" means that a hydrogen atom in a substituted group is replaced by a substituent.

[0081] In this application, "substituted or unsubstituted" means that the defined group may be substituted or unsubstituted. When the defined group is substituted, it is understood that the defined group may be substituted by one or more substituents. In this application, unless otherwise stated, "substituted or unsubstituted" means that a hydrogen atom is replaced by F, Cl, Br or I.

[0082] When the applied voltage is 0V, the long axis direction of the liquid crystal molecules in the vertical alignment (VA) mode display is perpendicular to the glass substrate. After natural light passes through the TFT side polarizer, it forms linear polarization. At this time, its polarization state and polarization direction cannot be changed by the liquid crystal molecules, and thus it is absorbed by the color filter side polarizer, that is, the incident light perpendicular to the glass substrate cannot pass through, showing a good dark state effect. Therefore, VA mode display devices usually have negative dielectric anisotropy (Δε) and high contrast.

[0083] Some embodiments of the present application provide a liquid crystal composition, which includes at least one or more first compounds represented by general formula I.

[0084] The first compound is represented by the following general formula I:

[0085]

[0086] In the general formula I, R1 is selected from H, an alkyl or alkoxy group having 1 to 10 carbon atoms, an alkenyl or alkenyloxy group having 2 to 10 carbon atoms, a cycloalkane having 3 to 10 carbon atoms, or an aromatic ring having 3 to 10 carbon atoms.

[0087] In the general formula I, any one of the R1 groups or non-adjacent CH2 groups may be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the group may be replaced by F, Cl, Br or I.

[0088] In the general formula I, Z1, Z2 and Z3 are each independently selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, -CH=CH- or -C≡C-, or an alkylene group of 1 to 10 carbon atoms, or an alkenylene group of 2 to 10 carbon atoms or an alkynyl group of 2 to 10 carbon atoms, and any non-adjacent CH2 group may be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, -CH=CH- or -C≡C-, and one or more H in the group may be replaced by F, Cl, Br or I.

[0089] In the general formula I, L is selected from H, F, Cl, CF3, Sp, an alkyl or alkoxy group having 1-10 carbon atoms, an alkenyl or alkenyloxy group having 2-10 carbon atoms, an alkynyl or alkynyloxy group having 2-10 carbon atoms, a cycloalkane having 3-10 carbon atoms or an aromatic ring having 3-10 carbon atoms, any one of the L groups or non-adjacent CH2 groups can be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the group can be replaced by F, Cl, Br or I.

[0090] In the general formula I, Each independently selected from in Any non-adjacent -CH2- in the residue may be replaced by -O-.

[0091] In the general formula I, H in the benzene ring may be independently substituted by any F, Cl, Br, CN, SCN, NCS, or an alkyl or alkoxy group having 1 to 10 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 10 carbon atoms, or an alkynyl or alkynyloxy group having 2 to 10 carbon atoms.

[0092] In Formula I, n is selected from 1, 2 or 3.

[0093] In the general formula I, a and b are each independently selected from 0, 1, 2 or 3, and a+b≧1.

[0094] In the general formula I, c and d are each independently selected from 0, 1 or 2.

[0095] In the general formula I, p and q are each independently selected from 0, 1 or 2.

[0096] Sp is selected from ether, alkyl, alkoxy, alkenyl, alkenyloxy or polymerizable groups with or without branches, and at least one Sp in the general formula I represents a polymerizable group.

[0097] T is selected from a group that plays an anchoring role with the substrate.

[0098] In some embodiments of the present application, the liquid crystal composition may further include one or more second compounds represented by Formula II and / or one or more third compounds represented by Formula VI.

[0099] In some embodiments of the present application, the second compound is represented by the following general formula II:

[0100]

[0101] In the general formula II, Each independently selected from

[0102] In the general formula II, R2 and R3 are each independently selected from H, F, Cl, Br, CN, SCN, NCS, or an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl or alkenyloxy group having 2-10 carbon atoms, or an alkynyl or alkynyloxy group having 2-10 carbon atoms; wherein the terminal groups of R2 and R3 may be substituted by CN or CF3, and one or more CH2 groups in the R2 and R3 groups may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C- and the heteroatom is not directly bonded, and one or more H in the group may be substituted by F, Cl, Br, I.

[0103] In some embodiments of the present application, the third compound is represented by the following general formula VI:

[0104]

[0105] In the general formula VI, R7, R8, R9 and R 10 Each independently represents H, F, OH, CF3, or an alkyl or alkoxy group having 1 to 5 carbon atoms, or an alkenyl or alkenyloxy group having 1 to 5 carbon atoms, or an alkyl or alkoxy group having 1 to 5 carbon atoms, or an alkenyl or alkenyloxy group having 1 to 5 carbon atoms, and one or more H in these groups may be substituted by F, Cl, Br, or I.

[0106] In the general formula VI, Sp is selected from ether, alkyl, alkoxy, alkenyl, alkenyloxy or polymerizable groups with or without branches, and at least one Sp in the general formula VI represents a polymerizable group.

[0107] In Formula VI, a and b are each independently selected from 0, 1, 2 or 3, and a+b≧1.

[0108] In the liquid crystal compounds of the embodiments of the present application, the first compound has a structure as shown in Formula I. Compared with the conventional benzene ring structure, Formula I has the characteristic of extending the rigid chain length, thereby improving the alignment ability of the self-alignment additive to the liquid crystal composition.

[0109] In the liquid crystal compound of the embodiment of the present application, the second compound has a structure as shown in general formula II, has a lower viscosity, and an adjustable Δn, which is beneficial for improving the response speed of the liquid crystal composition and adjusting the physical properties of the liquid crystal composition.

[0110] In the liquid crystal compound of the embodiment of the present application, the third compound has a structure as shown in Formula VI. Under UV light, the third compound can undergo a polymerization reaction with the polymerizable group on the first compound to fix the pretilt angle.

[0111] The liquid crystal composition provided in the application embodiment can have a higher Tni, a higher Δn, a lower viscosity and a higher K value through the first compound, the second compound, and other liquid crystal compounds, which is beneficial to improve its operating temperature range, improve its penetration ability, and accelerate its response speed.

[0112] In some embodiments, the group T that acts as an anchor to the substrate is selected from the following general formula III:

[0113]

[0114] In the general formula III, R4, R5 and R6 are each independently selected from H, OH, F, Cl, Br, CN, SCN, NCS, or an alkyl or alkoxy group having 1 to 10 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 10 carbon atoms, or an alkynyl or alkynyloxy group having 2 to 10 carbon atoms.

[0115] Specifically, the terminal groups of R4, R5 and R6 may be substituted by OH, CN or CF3, and one or more CH2 groups in the R4, R5 and R6 groups may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C- so that the heteroatom is not directly bonded, or one or more H in the R4, R5 and R6 groups may be substituted by F, Cl, Br, I.

[0116] Specifically, at least one terminal group of the groups selected from R4, R5 and R6 is a hydroxyl group.

[0117] In Formula III, k is selected from an integer of 0 to 10.

[0118] In the general formula III, Z4 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, or an alkylene group of 1 to 10 carbon atoms, or an alkenylene group of 2 to 10 carbon atoms or an alkynyl group of 2 to 10 carbon atoms, and any non-adjacent CH2 groups may be It may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, or one or more H in the following groups may be substituted by F, Cl, Br or I:

[0119] In some embodiments, Sp is selected from the following formula IV to formula V

[0120]

[0121] In Formula IV to Formula V, m is selected from an integer of 0 to 10.

[0122] In Formula IV to Formula V, Z5 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, or an alkylene group of 1 to 10 carbon atoms, or an alkenylene group of 2 to 10 carbon atoms or an alkynyl group of 2 to 10 carbon atoms, and any non-adjacent CH2 groups The group may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, or one or more H in these groups may be substituted by F, Cl, Br or I by an alkylene group of 1 to 10 carbon atoms, an alkenylene group of 2 to 10 carbon atoms or an alkynyl group of 2 to 10 carbon atoms.

[0123] In some embodiments, n is selected from 1 or 2.

[0124] In some embodiments, a, b are selected from 0, 1 or 2, and a+b≥1.

[0125] In some embodiments, c, d are selected from 0 or 1.

[0126] In some embodiments, p, q are selected from 0 or 1.

[0127] In some embodiments, Formula I is selected from the following subformulae I-1 to I-26:

[0128]

[0129]

[0130] It should be noted that in the first compound represented by sub-formulas I-1 to I-26 of general formula I in the present application,

[0131] n is selected from 1 or 2.

[0132] a and b each independently represent 1 or 2.

[0133] Sp is selected from ether, alkyl, alkoxy, alkenyl, alkenyloxy or polymerizable groups with or without branches, and at least one Sp in the general formula I represents a polymerizable group.

[0134] T represents a group that plays an anchoring role with the substrate.

[0135] R1 is selected from H, alkyl or alkoxy having 1-10 carbon atoms, alkenyl or alkenyloxy having 2-10 carbon atoms, cycloalkane having 3-10 carbon atoms or aromatic ring having 3-10 carbon atoms, any one or non-adjacent CH2 groups in the R1 group can be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the group can be replaced by F, Cl, Br or I.

[0136] In some embodiments, the compound of Formula I is selected from the following compounds I-1-1 to I-26-4:

[0137]

[0138]

[0139]

[0140]

[0141]

[0142]

[0143]

[0144] The liquid crystal composition provided in the embodiment of the present application contains a first compound formed by compounding the compounds I-1-1 to I-26-4 as above, which can achieve good alignment ability of the liquid crystal composition. In the photo-alignment stage, there are no obvious visible dark lines in the pixels after slowly powering on and irradiating ultraviolet light, and the alignment of the entire surface is good; the solubility in the liquid crystal composition is good.

[0145] In some embodiments, the compound represented by Formula I can be selected from at least one of the compounds represented by Formula I-3-2, Formula I-9-1, Formula I-9-2, Formula I-10-2 and Formula I-25-4.

[0146] In the above technical scheme, the compound represented by the formula I-3-2 can be prepared according to the following synthetic route 1:

[0147]

[0148] Specifically, the chemical structure of formula I-3-2 is:

[0149]

[0150] When the compound represented by formula I-3-2 is prepared by synthetic route 1, the R1 group represents C5H 11 In addition, the prepared product was subjected to high-resolution mass spectrometry test, [M+H] + =877.6, confirmed to be the target product represented by formula I-3-2.

[0151] In the above technical scheme, the compound represented by formula I-9-1 can be prepared according to the following synthetic route 2, which is:

[0152]

[0153] Specifically, the chemical structure of formula I-9-1 is:

[0154]

[0155] When the compound represented by formula I-9-1 is prepared by synthetic route 2, the R1 group represents C5H 11 In addition, the prepared product was subjected to high-resolution mass spectrometry test, [M+H] + =807.5, confirmed to be the target product represented by formula I-9-1.

[0156] In the above technical scheme, the compound represented by formula I-9-2 can be prepared according to the following synthetic route 3, which is:

[0157]

[0158] Specifically, the chemical structure of formula I-9-2 is:

[0159]

[0160] When the compound represented by formula I-9-2 is prepared by synthetic route 3, the R1 group represents C5H 11 In addition, the prepared product was subjected to high-resolution mass spectrometry test, [M+H] + =849.5, confirmed to be the target product represented by formula I-9-2.

[0161] In the above technical scheme, the compound represented by formula I-10-2 can be prepared according to the following synthetic route 4, and the synthetic route 3 is:

[0162]

[0163] Specifically, the chemical structure of formula I-10-2 is:

[0164]

[0165] When the compound represented by formula I-10-2 is prepared by synthetic route 3, the R1 group represents C5H 11 In addition, the prepared product was subjected to high-resolution mass spectrometry test, [M+H] + =867.5, confirmed to be the target product represented by formula I-10-2.

[0166] In the above technical scheme, the compound represented by formula I-25-4 can be prepared according to the following synthetic route 5, where synthetic route 4 is:

[0167]

[0168] Specifically, the chemical structure of formula I-25-4 is:

[0169]

[0170] When the compound represented by formula I-23-4 is prepared by synthetic route 4, the R1 group represents C5H 11 In addition, the prepared product was subjected to high-resolution mass spectrometry test, [M+H] + =641.4, confirmed to be the target product represented by formula I-25-4.

[0171] Alternatively, in some embodiments, Formula II is selected from the following compounds II-1 to II-12:

[0172]

[0173] In some embodiments, based on the total weight of the liquid crystal composition, the mass percentage of the first compound represented by Formula I in the liquid crystal composition is 0.01% to 1.50%.

[0174] In some embodiments, based on the total weight of the liquid crystal composition, the liquid crystal composition includes the second compound represented by Formula II in an amount of 5% to 70% by mass.

[0175] In some embodiments, based on the total weight of the liquid crystal composition, the mass percentage of the third compound represented by Formula VI in the liquid crystal composition is 0.01% to 1.50%.

[0176] It should be noted that in some embodiments of the present application, the liquid crystal composition may include one first compound and one second compound. In some embodiments, the liquid crystal composition may also include two or more first compounds and two or more second compounds. When the liquid crystal composition includes two or more first compounds, the two or more first compounds are selected from different compounds and are all represented by the aforementioned general formula (I); when the liquid crystal composition includes two or more second compounds, the two or more second compounds are selected from different compounds and are all represented by the aforementioned general formula (II).

[0177] In some embodiments of the present application, the liquid crystal composition may include a first compound and a third compound. In some embodiments, the liquid crystal composition may also include two or more first compounds and two or more third compounds. When the liquid crystal composition includes two or more first compounds, the two or more first compounds are selected from different compounds and are all represented by the aforementioned general formula (I); when the liquid crystal composition includes two or more third compounds, the two or more second compounds are selected from different compounds and are all represented by the aforementioned general formula (VI).

[0178] In some embodiments, the liquid crystal composition includes a first compound represented by Formula I, a second compound represented by Formula II, a third compound represented by Formula VI, a fourth compound represented by Formula VII, a fifth compound represented by Formula VIII, and a sixth compound represented by Formula IX;

[0179] Wherein, the fourth compound has a structure as shown in the general formula VII:

[0180] The fifth compound has a structure as shown in Formula VIII:

[0181] The sixth compound has a structure as shown in Formula IX:

[0182] In the above technical solution, Each independently expresses in, Any non-adjacent -CH2- in may be replaced by -O-, and

[0183] express in Any non-adjacent -CH2- in may be replaced by -O-, and

[0184] Z6 represents a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, or an alkylene group of 1-10 carbon atoms, or an alkenylene group of 2-10 carbon atoms or an alkynyl group of 2-10 carbon atoms, and any non-adjacent CH2 group may be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, and one or more H in the group may be replaced by F, Cl, Br, or I.

[0185] R 11 , R 12 , R 13 , R 14 , R 15 and R 16 Each independently represents H, F, Cl, Br, CN, SCN, NCS, or an alkyl or alkoxy group having 1 to 10 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 10 carbon atoms, or an alkynyl or alkynyloxy group having 2 to 10 carbon atoms; wherein R 11 , R 12 , R 13 , R 14 , R 15 and R 16 The terminal group may be substituted by CN or CF3, and R 11 , R 12 , R 13 , R 14 , R 15 and R 16One or more CH2 groups in the group can be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C- so that the heteroatom is not directly bonded, and one or more H in the group can be replaced by F, Cl, Br, or I.

[0186] In some embodiments, the liquid crystal composition may include the following components in weight percentage:

[0187] 0.01-1.5% of the first compound represented by general formula I, 5-70% of the second compound represented by general formula II, 0.01-1.5% of the third compound represented by general formula VI, 1-30% of the fourth compound represented by general formula VII, 1-30% of the fifth compound represented by general formula VIII, and 1-40% of the sixth compound represented by general formula IX.

[0188] In some embodiments, the liquid crystal composition may include the following components in weight percentage:

[0189] 0.05-1.2% of the first compound represented by general formula I, 10-60% of the second compound represented by general formula II, 0.05-1.2% of the third compound represented by general formula VI, 1-20% of the fourth compound represented by general formula VII, 1-20% of the fifth compound represented by general formula VIII, and 1-30% of the sixth compound represented by general formula IX.

[0190] In the present application, the combination of compounds in the liquid crystal composition can be arbitrarily matched according to the performance requirements of the liquid crystal composition. The following embodiments of the present application only take the distribution of some components of the liquid crystal composition as an example, and illustrate the performance of the liquid crystal composition of the present application by measuring the relevant performance parameters of the liquid crystal composition, but are not limited to this.

[0191] In the following examples of the present application, the liquid crystal composition can be prepared by a thermal dissolution method, see Figure 1 , the preparation method comprises the following steps:

[0192] Step S100, mixing the components of the liquid crystal composition to obtain a mixture, wherein the components can be weighed and mixed in order from low to high melting points;

[0193] Step S200, heating and stirring the mixture at a temperature of 60°C-100°C to fully dissolve and uniformly mix the components;

[0194] Step S300, cooling to room temperature to obtain a liquid crystal composition.

[0195] The use of the first compound represented by the general formula I provided by the present invention in the preparation of liquid crystal compositions, liquid crystal display materials or electro-optical display element materials without a PI alignment layer, as well as liquid crystal compositions, liquid crystal display materials or electro-optical display element materials containing the general formula I, II or the general formula I, III, also fall within the scope of protection of the present application.

[0196] The other components of the liquid crystal composition of the present application can be foreseen by those skilled in the art, based on professional knowledge and device parameter requirements, that the performance of the composition will be significantly improved after the compounds of the present application are added. Specifically, the composition can achieve vertical alignment without a PI alignment layer, has the characteristics of reducing the number of process passes and saving production capacity, has positive significance for the development of green manufacturing processes, and is very suitable for the deployment of mixed liquid crystals. At the same time, the present application protects the application of the above-mentioned liquid crystal composition in VA, PSA, PS-VA, PVA or MVA electro-optical display elements.

[0197] Example 1

[0198] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this embodiment are shown in Table 1.

[0199] Table 1 Component distribution and performance parameters of the liquid crystal composition of Example 1

[0200]

[0201]

[0202] Example 2

[0203] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this embodiment are shown in Table 2.

[0204] Table 2 Component distribution and performance parameters of the liquid crystal composition of Example 2.

[0205]

[0206]

[0207] Example 3

[0208] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this embodiment are shown in Table 3.

[0209] Table 3 Component distribution and performance parameters of the liquid crystal composition of Example 3

[0210]

[0211]

[0212] Example 4

[0213] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this embodiment are shown in Table 4.

[0214] Table 4 Component distribution and performance parameters of the liquid crystal composition of Example 4

[0215]

[0216]

[0217]

[0218] Example 5

[0219] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this embodiment are shown in Table 5.

[0220] Table 5 Component distribution and performance parameters of the liquid crystal composition of Example 5

[0221]

[0222]

[0223] Example 6

[0224] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this embodiment are shown in Table 6.

[0225] Table 6 Component distribution and performance parameters of the liquid crystal composition of Example 6

[0226]

[0227]

[0228] Comparative Example 1

[0229] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this comparative example are shown in Table 7.

[0230] Table 7 Component distribution and performance parameters of the liquid crystal composition of Comparative Example 1

[0231]

[0232]

[0233] Comparative Example 2

[0234] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this comparative example are shown in Table 8.

[0235] Table 8 Component distribution and performance parameters of the liquid crystal composition of Comparative Example 2

[0236]

[0237]

[0238] In Tables 1 to 8, Tni represents the clearing point of the liquid crystal composition (unit: °C); γ1 represents the rotational viscosity of the liquid crystal composition at 25 °C (unit: mPa / s); Δn represents the birefringence difference of the liquid crystal composition at 25 °C (representing the optical anisotropy of the liquid crystal composition); n e represents the refractive index of extraordinary light; Δε represents the dielectric anisotropy of the liquid crystal composition at 25°C; ε ⊥ Represents the dielectric constant perpendicular to the long axis of the liquid crystal molecule; K 11 represents the splay elastic coefficient, K 33 In addition, unless otherwise specified, the elastic constants described in this application all represent average elastic constants, i.e., K 11 and K 33 The average value of .

[0239] Tables 1 to 3 show the component distribution and performance parameters of the liquid crystal compositions provided in Examples 1 to 3 of the present application, and Table 7 shows the component distribution and performance parameters of the liquid crystal compositions of Comparative Example 1. Among them, the difference between the liquid crystal composition provided in Comparative Example 1 and the liquid crystal composition provided in Example 1 is that the self-alignment additive represented by Formula I-9-1 is not added in the comparative example, which requires a PI process. If the PI process is missing, the vertical alignment of the liquid crystal composition relative to the substrate surface cannot be achieved. The liquid crystal compositions of Examples 1 to 6 have the characteristics of spontaneous vertical alignment relative to the substrate surface. A certain voltage is applied and UV light is irradiated. The liquid crystal composition in the test box forms a certain pre-tilt angle. Then a voltage is applied to both ends of the test box, and the liquid crystal box achieves reversible switching of the light transmittance. Tables 4 to 6 show the component distribution and performance parameters of the liquid crystal compositions provided in Examples 4 to 6 of the present application, and Table 8 shows the component distribution and performance parameters of the liquid crystal composition of Comparative Example 2. Among them, the difference between the liquid crystal composition provided in Comparative Example 2 and the liquid crystal composition provided in Example 4 is that the self-alignment additive represented by Formula I-10-2 is not added in the comparative example, and a PI process is required to form a fixed pretilt angle. If the PI process is missing, the vertical alignment of the liquid crystal composition relative to the substrate surface cannot be achieved.

[0240] Combining the liquid crystal composition and the test results of Examples 1-2, it can be seen that the liquid crystal composition has a higher Tni, which increases its use temperature range, has a higher Δn, which is beneficial to improving its penetration ability, and has a lower viscosity and a higher K value, which is beneficial to improving its response speed. Compared with Examples 1-2, the liquid crystal composition of Example 3 increases the total content of the self-alignment additive, improves the alignment ability of the liquid crystal composition, and there is no poor alignment phenomenon such as dark lines and dark lines in the pixel.

[0241] The liquid crystal composition and its application provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A liquid crystal composition, characterized in that: The liquid crystal composition comprises one or more first compounds represented by Formula I; in, R1 is selected from H, an alkyl or alkoxy group having 1 to 10 carbon atoms, an alkenyl or alkenyloxy group having 2 to 10 carbon atoms, a cycloalkane having 3 to 10 carbon atoms, or an aromatic ring having 3 to 10 carbon atoms, any one or non-adjacent CH2 groups in the R1 group may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the group may be substituted by F, Cl, Br or I; Z1, Z2 and Z3 are each independently selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, -CH=CH- or -C≡C-, or an alkylene group of 1 to 10 carbon atoms, or an alkenylene group of 2 to 10 carbon atoms or an alkynyl group of 2 to 10 carbon atoms, and any non-adjacent CH2 group may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, -CH=CH- or -C≡C-, and one or more H in the group may be substituted by F, Cl, Br or I; L is selected from H, F, Cl, CF3, Sp, an alkyl or alkoxy group having 1-10 carbon atoms, an alkenyl or alkenyloxy group having 2-10 carbon atoms, an alkynyl or alkynyloxy group having 2-10 carbon atoms, a cycloalkane having 3-10 carbon atoms, or an aromatic ring having 3-10 carbon atoms, any one or non-adjacent CH2 groups in the L group may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the group may be substituted by F, Cl, Br or I; Each independently selected from in Any non-adjacent -CH2- in can be replaced by -O-; The H in the benzene ring of the general formula I may be independently substituted by any F, Cl, Br, CN, SCN, NCS, or an alkyl or alkoxy group having 1 to 10 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 10 carbon atoms, or an alkynyl or alkynyloxy group having 2 to 10 carbon atoms; n is selected from 1, 2 or 3; a and b are each independently selected from 0, 1, 2 or 3, and a+b≥1; c and d are each independently selected from 0, 1 or 2; p and q are each independently selected from 0, 1 or 2; Sp is selected from ether, alkyl, alkoxy, alkenyl, alkenyloxy or polymerizable groups with or without branches, and at least one Sp in the general formula I represents a polymerizable group; T is selected from a group that plays an anchoring role with the substrate.

2. The liquid crystal composition according to claim 1, characterized in that: n is selected from 1 or 2, and the group T that acts as an anchor to the substrate is selected from the general formula III: in, R4, R5 and R6 are each independently selected from H, OH, F, Cl, Br, CN, SCN, NCS, or an alkyl or alkoxy group having 1 to 10 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 10 carbon atoms, or an alkynyl or alkynyloxy group having 2 to 10 carbon atoms; wherein the terminal groups of R4, R5 and R6 may be substituted by OH, CN or CF3, and one or more CH2 groups in the R4, R5 and R6 groups may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C- so that the heteroatom is not directly bonded, and one or more H in the group may be substituted by F, Cl, Br, I; at least one terminal group in the group selected from R4, R5 and R6 is a hydroxyl group; k is an integer selected from 0 to 10; Z4 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, or an alkylene group of 1-10 carbon atoms, or an alkenylene group of 2-10 carbon atoms or an alkynyl group of 2-10 carbon atoms, and any non-adjacent CH2 group can be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, and one or more H in the group can be replaced by F, Cl, Br, I.

3. The liquid crystal composition according to claim 1, characterized in that: Sp is selected from the group consisting of Formula IV to Formula V: in, m is an integer selected from 0 to 10; Z5 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, or an alkylene group of 1-10 carbon atoms, or an alkenylene group of 2-10 carbon atoms or an alkynyl group of 2-10 carbon atoms, and any non-adjacent CH2 group can be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C-, and one or more H in the group can be replaced by F, Cl, Br, I.

4. The liquid crystal composition according to claim 1, characterized in that: The general formula I is selected from one or more subformulas of the following I-1 to I-26: in, n is selected from 1 or 2; a, b are each independently selected from 1 or 2; Sp is selected from ether, alkyl, alkoxy, alkenyl, alkenyloxy or polymerizable groups with or without branches, and at least one polymerizable group represented by Sp is present in any of Formulas I-1 to I-26; T is selected from a group that plays an anchoring role with the substrate; R1 is selected from H, alkyl or alkoxy having 1-10 carbon atoms, alkenyl or alkenyloxy having 2-10 carbon atoms, cycloalkane having 3-10 carbon atoms or aromatic ring having 3-10 carbon atoms, any one or non-adjacent CH2 groups in the R1 group can be replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the group can be replaced by F, Cl, Br or I.

5. The liquid crystal composition according to claim 4, characterized in that: One or more compounds of formula I selected from I-1-1 to I-26-4:

6. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises one or more second compounds represented by Formula II; in, Each independently selected from R2 and R3 are each independently selected from H, F, Cl, Br, CN, SCN, NCS, or an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl or alkenyloxy group having 2-10 carbon atoms, or an alkynyl or alkynyloxy group having 2-10 carbon atoms; wherein the terminal groups of R2 and R3 may be substituted by CN or CF3, and one or more CH2 groups in the R2 and R3 groups may be substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C- and the heteroatom is not directly bonded, or one or more H in the alkyl or alkoxy group having 1-10 carbon atoms, the alkenyl or alkenyloxy group having 2-10 carbon atoms, the alkynyl or alkynyloxy group having 2-10 carbon atoms is substituted by F, Cl, Br, or I.

7. The liquid crystal composition according to claim 6, characterized in that: The general formula II is selected from one or more of the following compounds II-1 to II-12:

8. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises one or more third compounds represented by general formula VI; Among them, R7, R8, R9 and R 10 Each independently represents H, F, OH, CF3, or an alkyl or alkoxy group having 1 to 5 carbon atoms, or an alkenyl or alkenyloxy group having 1 to 5 carbon atoms, or an alkyl or alkoxy group having 1 to 5 carbon atoms, in which one or more H in the alkenyl or alkenyloxy group having 1 to 5 carbon atoms is substituted by F, Cl, Br, or I; Sp is selected from ether, alkyl, alkoxy, alkenyl, alkenyloxy or polymerizable groups with or without branches, and at least one Sp in the general formula VI represents a polymerizable group; a and b are each independently selected from 0, 1, 2 or 3, and a+b≧1.

9. The liquid crystal composition according to claim 8, characterized in that: The general formula VI is selected from one or more of the following compounds VI-1 to VI-8:

10. The liquid crystal composition according to claim 1, characterized in that: The mass percentage of the first compound represented by Formula I in the liquid crystal composition is 0.01% to 1.50%.

11. The liquid crystal composition according to claim 6, characterized in that: The mass percentage of the second compound represented by Formula II in the liquid crystal composition is 5% to 70%.

12. The liquid crystal composition according to claim 8, characterized in that: The mass percentage of the third compound represented by the general formula VI in the liquid crystal composition is 0.01% to 1.50%.

13. A liquid crystal display element, characterized in that: include: An electrode group is formed on one or both of a pair of substrates disposed opposite to each other; A plurality of active elements connected to the electrode group; RGB color resist, wherein the R color resist contains diketopyrrolopyrrole or other organic pigment compounds, and the water-soluble pigment contained in the R color resist is not higher than 1.5%, and 90% of the pigment particles are in the range of 0-100 nm; and The liquid crystal composition according to any one of claims 1 to 12, sandwiched between the pair of substrates; The liquid crystal composition comprises one or more first compounds represented by general formula I, one or more second compounds represented by general formula II, or one or more third compounds represented by general formula VI.

14. A use of the liquid crystal composition according to any one of claims 1 to 12, characterized in that: The liquid crystal composition is used in liquid crystal media, VA, PSA, PS-VA, PVA or MVA electro-optical display elements.

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