Liquid crystal composition, liquid crystal display element and liquid crystal display comprising the same

Abstract

The present invention discloses a liquid crystal composition and a liquid crystal display element and a liquid crystal display comprising the liquid crystal composition. The liquid crystal composition comprises one or more compounds represented by formula I and one or more compounds selected from the group consisting of compounds represented by formula II, formula III and formula IV. When the liquid crystal composition is used in a liquid crystal display device, it can effectively avoid the problems of dust particles, static electricity residue, residue, brush marks and the like caused by the friction alignment type alignment layer, which reduce the yield of the liquid crystal display device. It can not only form a good alignment effect, but also ensure the uniformity of the film thickness at different positions. At the same time, the particle size of RM after the polymerization reaction is moderate, and the pretilt angle formed has good stable alignment ability. The liquid crystal display using the alignment film has good reliability, a wide viewing angle range, and can effectively improve poor display. Ⅰ; Ⅱ; Ⅲ; Ⅳ.

Description

Technical Field

[0001] The present invention relates to the field of liquid crystal display technology, and more specifically, to a liquid crystal composition and a liquid crystal display element and a liquid crystal display comprising the liquid crystal composition. Background Art

[0002] With the development of display technology, LCD panels have been integrated into our daily lives, and the future development direction of LCD displays also directly affects people's quality of life.

[0003] PSVA display is the main display mode of TV display, and domestic related companies are mainly engaged in PSVA display panels. However, with the continuous development of technology, how to gain advantages in technology optimization and cost reduction is an important direction for the future development of panel manufacturers. In terms of technology optimization: 1) PSVA technology needs to continue to optimize materials and process technology to improve market competitiveness; 2) Continue to improve viewing angle and color performance: By improving pixel electrode design, such as 8-domain structure, to improve color deviation, improve viewing angle breadth and color accuracy, approaching or surpassing FFS-type horizontal alignment technology; 3) High resolution and diversified applications: Continue to develop towards 8K and above resolutions to meet the needs of professional and consumer markets, while exploring applications in emerging markets such as wearable devices, AR / VR, etc.; 4) Environmental protection and sustainability: Reduce the use of hazardous substances and increase recycling rates.

[0004] Providing new PSVA technology to reduce customer processes and promote green manufacturing and circular economy has become the focus of new LCD research. We know that in addition to liquid crystal materials, display panels also have PI materials that provide orientation for liquid crystals. If certain compounds are added to liquid crystals, they can play the role of PI. Technology that can achieve PI less will become a key breakthrough in future technologies.

[0005] Features of PI-less technology for liquid crystal: PI-less technology achieves self-alignment of liquid crystal by eliminating PI (polyimide) related processes. This not only reduces production costs, but also improves production efficiency. In the application of PSVA products, PI-less technology can well improve the problem of dark clusters on curved screens and has broad application prospects. In addition, the successful application of this technology has also broken the foreign technology monopoly and has had a significant impact on the coordinated development of the upstream and downstream industrial chains.

[0006] Although PIless technology has many advantages, there are still some problems in practical applications. For example, how to ensure the stability and reliability of the panel when there is no PI on both sides, how to stably diffuse the alignment agent after dripping into the panel, how to ensure the thickness of the film layer at different positions, the particle size of RM after polymerization, the stability of the pretilt angle and the polymerization temperature of the polymer determine the high temperature tolerance of the liquid crystal, and the frame glue curing will have a high temperature baking after the LCD panel is assembled into a box, the purpose is to make the frame glue more completely cured, but at this time the RM and alignment agent in the liquid crystal cannot react. If the reaction is premature, it may form broken bright spots and may also affect the subsequent normal UV process. These are all problems that need to be solved urgently. Summary of the invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a liquid crystal composition and a liquid crystal display element and a liquid crystal display comprising the liquid crystal composition. When the liquid crystal composition is used in a liquid crystal display element or a liquid crystal display, it can form a good alignment effect and ensure the uniformity of the film thickness at different positions. At the same time, after the polymerization reaction, the particle size of RM is moderate, and the pretilt angle formed has a good stable alignment ability.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] In one aspect, the present invention provides a liquid crystal composition, characterized in that the liquid crystal composition comprises one or more compounds represented by formula I:

[0010] Ⅰ;

[0011] in,

[0012] , , Represented independently , , , , , , or ,and , , At least one selected from , , , , or ;

[0013] L1 to L4 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, wherein any one or more unconnected -CH2- groups may be substituted by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, and one or more H atoms may be independently substituted by F or Cl;

[0014] R1 represents a hydrogen atom, a chain alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms;

[0015] Sp1, Sp2, and Sp3 each independently represent a single bond or a chain alkyl group having 1 to 10 carbon atoms, wherein any one of the -CH2- groups may be substituted by -O-, -S-, -CO-, -CO-O-, -OCO-, or -O-CO-O-;

[0016] P1 and P2 each independently represent a polymerizable group;

[0017] K1 means ;

[0018] R2 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms;

[0019] n represents 0 or 1; and

[0020] At least one or more selected from the group consisting of compounds represented by formula II, formula III, and formula IV:

[0021] II;

[0022] III;

[0023] IV;

[0024] in,

[0025] , , , , , , , Each independently expresses , , , , , , or ,

[0026] express , , , , , , or ,

[0027] and , , , , , , , , Optional can be L a replace; , , At least one of them is L b replace;

[0028] L a represents a halogen atom, an alkyl group having 1 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms;

[0029] L b represents an alkenyl group having 2 to 7 carbon atoms;

[0030] Sp4, Sp5, Sp6, Sp7, Sp8, Sp9 each independently represent a single bond, a chain alkyl group having 1-5 carbon atoms, or a cyclic alkyl group having 1-5 carbon atoms, wherein any one or more unconnected -CH2- can be replaced by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, and any one or more H atoms in Sp4, Sp5, Sp8, Sp9 can be independently replaced by F or Cl, Sp6 and Sp7 are not single bonds at the same time, and at least one H atom in Sp6 and / or Sp7 is replaced by G3;

[0031] G3 represents a tertiary alcohol structure of 1 to 7 carbon atoms;

[0032] P4, P5, P6, P7, P8, and P9 each independently represent a polymerizable group;

[0033] m1, m2, and m3 each independently represent 0 or 1.

[0034] Furthermore, the compound represented by formula I is selected from the group consisting of compounds represented by formula I-1 to formula I-4:

[0035] Ⅰ-1;

[0036] I-2;

[0037] I-3;

[0038] I-4;

[0039] in,

[0040] L4 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, wherein any one or more unconnected -CH2- groups may be substituted by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, and one or more H atoms may be independently substituted by F or Cl;

[0041] R1 represents a hydrogen atom, a chain alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms;

[0042] Sp1 and Sp3 each independently represent a single bond or a chain alkyl group having 1 to 10 carbon atoms, wherein any one of the -CH2- groups may be substituted by -O-, -S-, -CO-, -CO-O-, -OCO-, or -O-CO-O-;

[0043] P1 and P2 each independently represent a polymerizable group;

[0044] R2 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms.

[0045] Furthermore, the compound represented by formula II is selected from the group consisting of compounds represented by the following formulas II-1 to II-7:

[0046] Ⅱ-1, Ⅱ-2、

[0047] Ⅱ-3, Ⅱ-4,

[0048] Ⅱ-5, Ⅱ-6,

[0049] II-7;

[0050] in,

[0051] L5 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms;

[0052] Sp4 and Sp5 each independently represent a single bond, a chain alkyl group having 1 to 5 carbon atoms, or a cyclic alkyl group having 1 to 5 carbon atoms, wherein any one or more unconnected -CH2- groups may be replaced by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, and any one or more H atoms in Sp4 and Sp5 may be independently replaced by F or Cl;

[0053] P4 and P5 each independently represent a polymerizable group.

[0054] Furthermore, the compound represented by formula III is selected from the group consisting of compounds represented by the following formulas III-1 to III-7:

[0055] III-1, III-2,

[0056] III-3, III-4,

[0057] III-5, III-6,

[0058] III-7;

[0059] in,

[0060] L6 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms;

[0061] Sp6 and Sp7 each independently represent a single bond, a chain alkyl group having 1 to 5 carbon atoms, or a cyclic alkyl group having 1 to 5 carbon atoms, wherein any one or more unconnected -CH2- groups may be substituted by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, Sp6 and Sp7 are not single bonds at the same time, and at least one H atom in Sp6 and / or Sp7 is substituted by G3;

[0062] G3 represents a tertiary alcohol structure of 1 to 7 carbon atoms;

[0063] P6 and P7 each independently represent a polymerizable group.

[0064] Furthermore, the compound represented by formula IV is selected from the group consisting of compounds represented by the following formulas IV-1 to IV-6:

[0065] IV-1. IV-2,

[0066] IV-3. IV-4,

[0067] IV-5. IV-6;

[0068] in,

[0069] L7, L8, and L9 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 7 carbon atoms; and at least one of L7, L8, and L9 represents an alkenyl group having 2 to 7 carbon atoms;

[0070] Sp8 and Sp9 each independently represent a single bond, a chain alkyl group having 1 to 5 carbon atoms, or a cyclic alkyl group having 1 to 5 carbon atoms, wherein any one or more unconnected -CH2- groups may be replaced by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, and any one or more H atoms in Sp8 and Sp9 may be independently replaced by F or Cl;

[0071] P8 and P9 each independently represent a polymerizable group.

[0072] Furthermore, the polymerizable group is selected from or , where · represents the connection site.

[0073] Furthermore, the liquid crystal composition comprises at least one compound represented by formula I-1.

[0074] Furthermore, in the liquid crystal composition, the mass percentage of the compound represented by formula I is 0.3-1.5 wt %.

[0075] Furthermore, in the liquid crystal composition, the mass percentages of the compounds represented by Formula II, Formula III, and Formula IV are each independently 0-0.5 wt %, and are not 0 at the same time.

[0076] Furthermore, the compound represented by formula I is selected from the group consisting of compounds represented by the following formulas I-1-1 to I-4-1:

[0077] Ⅰ-1-1、 Ⅰ-1-2、

[0078] Ⅰ-1-3、 Ⅰ-1-4,

[0079] Ⅰ-1-5, Ⅰ-2-1、

[0080] Ⅰ-3-1、 Ⅰ-4-1.

[0081] Furthermore, the compound represented by formula II is selected from the group consisting of compounds represented by the following formulas II-1-1 to II-1-9, formula II-2-1 or formula II-5-1:

[0082] Ⅱ-1-1、 Ⅱ-1-2、

[0083] Ⅱ-1-3、 Ⅱ-1-4,

[0084] Ⅱ-1-5, Ⅱ-1-6,

[0085] Ⅱ-1-7, Ⅱ-1-8

[0086] Ⅱ-1-9, Ⅱ-2-1、

[0087] Ⅱ-5-1.

[0088] Furthermore, the compound represented by formula III is selected from the group consisting of compounds represented by the following formulas III-1-1 to III-3-2:

[0089] III-1-1, III-1-2,

[0090] III-1-3, III-1-4,

[0091] III-1-5, III-1-6

[0092] III-1-7 III-1-8

[0093] III-1-9 III-1-10,

[0094] III-1-11, III-1-12,

[0095] III-1-13,

[0096] III-2-1, III-2-2,

[0097] III-2-3, III-2-4,

[0098] III-2-5, III-2-6

[0099] III-2-7 III-2-8

[0100] III-2-9 III-2-10,

[0101] III-2-11, III-2-12,

[0102] III-2-13, III-2-14,

[0103] III-3-1, Ⅲ-3-2.

[0104] Furthermore, the compound represented by formula IV is selected from the group consisting of compounds represented by the following formulae IV-1-1 to IV-6-6:

[0105] IV-1-1, IV-1-2

[0106] IV-1-3 IV-1-4

[0107] IV-1-5 IV-1-6

[0108] IV-2-1, IV-3-1,

[0109] IV-4-1, IV-5-1,

[0110] IV-5-2, IV-5-3,

[0111] IV-5-4, IV-5-5,

[0112] IV-6-1, IV-6-2

[0113] IV-6-3, IV-6-4,

[0114] IV-6-5, IV-6-6.

[0115] Furthermore, the liquid crystal composition comprises at least one compound represented by Formula I and at least one compound represented by Formula II.

[0116] Furthermore, the liquid crystal composition comprises at least one compound represented by formula I, at least one compound represented by formula II and at least one compound represented by formula III.

[0117] Furthermore, the liquid crystal composition comprises at least one compound represented by formula I, at least one compound represented by formula II and at least one compound represented by formula IV.

[0118] Furthermore, the liquid crystal composition comprises at least one compound represented by formula I, at least one compound represented by formula III and at least one compound represented by formula IV.

[0119] Furthermore, the liquid crystal composition comprises at least one compound represented by formula I and at least one compound represented by formula IV.

[0120] Furthermore, the liquid crystal composition comprises at least one compound represented by formula I, at least one compound represented by formula II, at least one compound represented by formula III and at least one compound represented by formula IV.

[0121] Furthermore, the liquid crystal composition comprises one or more compounds represented by formula V:

[0122] V;

[0123] in,

[0124] R 21 , R3 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms, R 21 Any one or more unattached -CH2- groups in the groups shown are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene.

[0125] Furthermore, the liquid crystal composition further comprises one or more compounds represented by formula VI:

[0126] VI;

[0127] in,

[0128] R4 and R5 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms.

[0129] Furthermore, the liquid crystal composition further comprises one or more compounds represented by formula VII:

[0130] VII;

[0131] in,

[0132] R6 and R7 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, and any one or more unconnected -CH2- groups in the group represented by R6 are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene;

[0133] a represents 0 or 1;

[0134] Z1 represents a single bond, -CH2O-, -CH2CH2- or -CH=CH-;

[0135] express , or , when a represents 1, express or .

[0136] Furthermore, the liquid crystal composition further comprises one or more compounds represented by formula VIII:

[0137] VIII;

[0138] in,

[0139] R8 and R9 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms;

[0140] express , or .

[0141] In another aspect, the present invention provides a liquid crystal display element, comprising the liquid crystal composition as described above, wherein the liquid crystal display element is an active matrix display element or a passive matrix display element.

[0142] Furthermore, the liquid crystal display element has an alignment film formed by the liquid crystal composition.

[0143] In another aspect, the present invention provides a liquid crystal display, comprising the liquid crystal composition as described above, and the liquid crystal display is an active matrix display or a passive matrix display.

[0144] Furthermore, the liquid crystal display element has an alignment film formed by the liquid crystal composition.

[0145] The beneficial effects of the present invention are as follows:

[0146] The technical solution of the present invention can effectively avoid the problems of dust particles, static electricity residue, residue, brush marks and the like caused by the friction alignment type alignment layer, which reduce the yield rate of liquid crystal display devices. It can not only form a good alignment effect, but also ensure the uniformity of film thickness at different positions. In the liquid crystal composition of the present invention, the alignment agent shown in Formula I is matched with the polymerizable compound RM of the present invention, which has a higher temperature for preventing self-polymerization and can effectively prevent self-polymerization caused by excessive temperature during the curing process of the frame glue. At the same time, the particle size of RM after the polymerization reaction is moderate, and the pre-tilt angle formed has good stable alignment ability. The liquid crystal display using the alignment film has good reliability, a wider viewing angle range, and can effectively improve poor display. DETAILED DESCRIPTION

[0147] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0148] According to a specific embodiment of the present invention, a liquid crystal composition is provided, wherein the liquid crystal composition comprises one or more compounds represented by formula I:

[0149] Ⅰ;

[0150] in,

[0151] , , Represented independently , , , , , , or ,and , , At least one selected from , , , , or ;

[0152] L1 to L4 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, wherein any one or more unconnected -CH2- groups may be substituted by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, and one or more H atoms may be independently substituted by F or Cl;

[0153] R1 represents a hydrogen atom, a chain alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms;

[0154] Sp1, Sp2, and Sp3 each independently represent a single bond or a chain alkyl group having 1 to 10 carbon atoms, wherein any one of the -CH2- groups may be substituted by -O-, -S-, -CO-, -CO-O-, -OCO-, or -O-CO-O-;

[0155] P1 and P2 each independently represent a polymerizable group;

[0156] K1 means ;

[0157] R2 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms;

[0158] n represents 0 or 1; and

[0159] At least one or more selected from the group consisting of compounds represented by formula II, formula III, and formula IV:

[0160] II;

[0161] III;

[0162] IV;

[0163] in,

[0164] , , , , , , , Each independently expresses , , , , , , or ;

[0165] express , , , , , , or ,

[0166] and , , , , , , , , Optional can be L a replace; , , At least one of them is L b replace;

[0167] L a represents a halogen atom, an alkyl group having 1 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms;

[0168] L b represents an alkenyl group having 2 to 7 carbon atoms;

[0169] Sp4, Sp5, Sp6, Sp7, Sp8, Sp9 each independently represent a single bond, a chain alkyl group having 1-5 carbon atoms, or a cyclic alkyl group having 1-5 carbon atoms, wherein any one or more unconnected -CH2- can be replaced by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, and any one or more H atoms in Sp4, Sp5, Sp8, Sp9 can be independently replaced by F or Cl, Sp6 and Sp7 are not single bonds at the same time, and at least one H atom in Sp6 and / or Sp7 is replaced by G3;

[0170] G3 represents a tertiary alcohol structure of 1 to 7 carbon atoms;

[0171] P4, P5, P6, P7, P8, and P9 each independently represent a polymerizable group;

[0172] m1, m2, and m3 each independently represent 0 or 1.

[0173] In this embodiment, the compound represented by Formula I can be used as an alignment agent in the liquid crystal composition; the compound represented by any one or more of Formula II, Formula III, and Formula IV is a polymerizable compound (RM).

[0174] In some examples, each of the Sp3 groups represents a chain alkyl group having 1 to 10 carbon atoms in which a -CH2- group is replaced by -O-. For example, Sp3 is an alkoxy group having 1 to 10 carbon atoms.

[0175] In some examples, the halogen atom is selected from one or more of fluorine, chlorine, and bromine.

[0176] In some examples, the , , , , , , , , Any group in L a When substituted, it is single substitution.

[0177] In some specific examples, the for or .

[0178] In some examples, the For L b Monosubstituted. Exemplary structures include, but are not limited to wait.

[0179] In some preferred examples, the compound represented by Formula I is selected from the group consisting of compounds represented by Formula I-1 to Formula I-4:

[0180] Ⅰ-1;

[0181] I-2;

[0182] I-3;

[0183] I-4;

[0184] in,

[0185] L4 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, wherein any one or more unconnected -CH2- groups may be substituted by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, and one or more H atoms may be independently substituted by F or Cl;

[0186] R1 represents a hydrogen atom, a chain alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms;

[0187] Sp1 and Sp3 each independently represent a single bond or a chain alkyl group having 1 to 10 carbon atoms, wherein any one of the -CH2- groups may be substituted by -O-, -S-, -CO-, -CO-O-, -OCO-, or -O-CO-O-;

[0188] P1 and P2 each independently represent a polymerizable group;

[0189] R2 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms.

[0190] When the compound shown in Formula I is selected from at least one of the compounds shown in Formula I-1 to Formula I-4 above, the liquid crystal composition obtained by combining it with at least one or more compounds shown in Formula II, Formula III, and Formula IV has more stable alignment ability, better film thickness uniformity, better aging resistance, more stable pretilt angle and structural stability when used in the preparation of liquid crystal display devices.

[0191] In some preferred examples, the compound represented by formula II is selected from the group consisting of compounds represented by the following formulas II-1 to II-7:

[0192] Ⅱ-1, Ⅱ-2、

[0193] Ⅱ-3, Ⅱ-4,

[0194] Ⅱ-5, Ⅱ-6,

[0195] II-7;

[0196] in,

[0197] L5 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms.

[0198] In some preferred examples, the compound represented by formula III is selected from the group consisting of compounds represented by the following formulae III-1 to III-7:

[0199] III-1, III-2,

[0200] III-3, III-4,

[0201] III-5, III-6,

[0202] III-7;

[0203] in,

[0204] L6 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms.

[0205] In some preferred examples, the compound represented by formula IV is selected from the group consisting of compounds represented by the following formulae IV-1 to IV-6:

[0206] IV-1. IV-2,

[0207] IV-3. IV-4,

[0208] IV-5. IV-6;

[0209] in,

[0210] L7, L8, and L9 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 7 carbon atoms; and at least one of L7, L8, and L9 represents an alkenyl group having 2 to 7 carbon atoms.

[0211] In some preferred examples, the liquid crystal composition comprises at least one compound represented by Formula I-1.

[0212] In some examples, in the liquid crystal composition, the mass percentage of the compound represented by Formula I is 0.3-1.5wt%. For example, in the liquid crystal composition, the mass percentage of the compound represented by Formula I includes, but is not limited to, 0.7-1.5 wt%, 0.7-1.2 wt%, 0.7-1wt%, 0.7-0.9wt%, 0.7-0.8wt%, 0.8-1.2 wt%, 0.8-1wt%, 0.8-0.9wt%, 0.9-1.2 wt%, 0.9-1wt%, etc.

[0213] The compound represented by Formula I has slightly different solubility in liquid crystal due to different substituents, but can be added in an amount of 0.5%-1.5% by weight. Since the polymer formed by the compound of Formula I plays the role of insulating PI, a certain thickness is necessary, so the compound of Formula I must have sufficient solubility.

[0214] In some examples, the polymerizable group is selected from or , where · represents the connection site.

[0215] In some examples, in the liquid crystal composition, the compound represented by Formula II is added in an amount of 0-0.5 wt %.

[0216] In some specific examples, in the liquid crystal composition, the added amount of the compound represented by Formula II includes but is not limited to 0, 0.05-0.5 wt%, 0.05-0.4 wt%, 0.09-0.4 wt%, 0.09-0.2 wt%, 0.15-0.4 wt%, etc.

[0217] In some examples, the amount of the compound represented by Formula III in the liquid crystal composition is 0-0.5 wt%. In some specific examples, the amount of the compound represented by Formula III in the liquid crystal composition includes but is not limited to 0, 0.05-0.5 wt%, 0.05-0.4 wt%, 0.05-0.2 wt%, 0.09-0.4 wt%, 0.09-0.2 wt%, 0.1-0.5 wt%, etc.

[0218] In this embodiment, the compounds represented by formula III and the compounds and intermediates of its subformulae can be prepared by methods similar to those known to those skilled in the art and described in standard works of organic chemistry (e.g., Houben-Weyl, Methoden der organischen Chemie [Methods of Organic Chemistry], Thieme-Verlag, Stuttgart).

[0219] In this embodiment, the compound represented by formula IV and its sub-formulae and intermediates can be prepared by methods known to those skilled in the art and described in standard works of organic chemistry (e.g., Houben-Weyl, Methoden der organischen Chemie [Methods of Organic Chemistry], Thieme-Verlag, Stuttgart).

[0220] For example, acrylates or methacrylates can be prepared by esterification of the corresponding alcohol with an acid derivative, such as (meth)acryloyl chloride or (meth)acrylic anhydride, in the presence of a base such as pyridine or triethylamine and 4-(N,N-dimethylamino)pyridine (DMAP). Alternatively, the esters can be prepared by esterification of the alcohol with (meth)acrylic acid in the presence of a dehydrating agent, for example according to Steglich with dicyclohexylcarbodiimide (DCC), N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide (EDC) or N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride and DMAP.

[0221] In some examples, the amount of the compound represented by Formula IV in the liquid crystal composition is 0-0.5 wt%. In some specific examples, the amount of the compound represented by Formula IV in the liquid crystal composition includes but is not limited to 0, 0.05-0.5 wt%, 0.05-0.4 wt%, 0.05-0.2 wt%, 0.09-0.5 wt%, 0.09-0.4 wt%, etc.

[0222] In some examples, in the liquid crystal composition, the mass percentages of the compounds represented by Formula II, Formula III, and Formula IV are each independently 0-0.5 wt %, and are not 0 at the same time.

[0223] In some preferred examples, the compound represented by formula I is selected from the group consisting of compounds represented by the following formulas I-1-1 to I-4-1:

[0224] Ⅰ-1-1、 Ⅰ-1-2、

[0225] Ⅰ-1-3、 Ⅰ-1-4,

[0226] Ⅰ-1-5, Ⅰ-2-1、

[0227] Ⅰ-3-1、 Ⅰ-4-1.

[0228] In some preferred examples, the compound represented by formula II is selected from the group consisting of compounds represented by the following formulas II-1-1 to II-1-9, formula II-2-1 or formula II-5-1:

[0229] Ⅱ-1-1、 Ⅱ-1-2、

[0230] Ⅱ-1-3、 Ⅱ-1-4,

[0231] Ⅱ-1-5, Ⅱ-1-6,

[0232] Ⅱ-1-7, Ⅱ-1-8

[0233] Ⅱ-1-9, Ⅱ-2-1、

[0234] Ⅱ-5-1.

[0235] In some preferred examples, the compound represented by formula III is selected from the group consisting of compounds represented by the following formulae III-1-1 to III-3-2:

[0236] III-1-1, III-1-2,

[0237] III-1-3, III-1-4,

[0238] III-1-5, III-1-6

[0239] III-1-7 III-1-8

[0240] III-1-9 III-1-10,

[0241] III-1-11, III-1-12,

[0242] III-1-13,

[0243] III-2-1, III-2-2,

[0244] III-2-3, III-2-4,

[0245] III-2-5, III-2-6

[0246] III-2-7 III-2-8

[0247] III-2-9 III-2-10,

[0248] III-2-11, III-2-12,

[0249] III-2-13, III-2-14,

[0250] III-3-1, Ⅲ-3-2.

[0251] In some preferred examples, the compound represented by formula IV is selected from the group consisting of compounds represented by the following formulae IV-1-1 to IV-6-6:

[0252] IV-1-1, IV-1-2

[0253] IV-1-3 IV-1-4

[0254] IV-1-5 IV-1-6

[0255] IV-2-1, IV-3-1,

[0256] IV-4-1, IV-5-1,

[0257] IV-5-2, IV-5-3,

[0258] IV-5-4, IV-5-5,

[0259] IV-6-1, IV-6-2

[0260] IV-6-3, IV-6-4,

[0261] IV-6-5, IV-6-6.

[0262] In some preferred examples, the liquid crystal composition comprises at least one compound represented by Formula I and at least one compound represented by Formula II.

[0263] In some preferred examples, the liquid crystal composition comprises at least one compound represented by Formula I, at least one compound represented by Formula II, and at least one compound represented by Formula III.

[0264] In some preferred examples, the liquid crystal composition comprises at least one compound represented by Formula I, at least one compound represented by Formula II, and at least one compound represented by Formula IV.

[0265] In some preferred examples, the liquid crystal composition comprises at least one compound represented by formula I, at least one compound represented by formula III, and at least one compound represented by formula IV.

[0266] In some preferred examples, the liquid crystal composition comprises at least one compound represented by Formula I and at least one compound represented by Formula IV.

[0267] In some preferred examples, the liquid crystal composition comprises at least one compound represented by formula I, at least one compound represented by formula II, at least one compound represented by formula III and at least one compound represented by formula IV.

[0268] When the compounds represented by formula II, III, and IV are added to copolymerize with the compound represented by formula I, the mass percentage of the compounds represented by formula I to formula IV is added based on the total addition amount of the liquid crystal composition, preferably 0.7-1.7wt%, more preferably 0.9-1.4wt%.

[0269] In the technical solution of this embodiment, the compound shown in formula I provides a good alignment effect, and the addition of the compound shown in formula II or / and formula III can improve the VHR of the liquid crystal composition, but the conversion rate of the RM shown in formula II or / and formula III is too fast and cannot meet all UV processes. This is because a conversion rate that is too slow will seriously affect the production capacity, and too fast will have the risk of broken bright spots, so it cannot be too fast or too slow. Therefore, in order to meet all UV processes, the compound shown in formula IV can be appropriately added as needed to appropriately reduce the conversion rate of RM. The present invention can also add one RM of the compound shown in formula II or formula III or formula IV to form a liquid crystal composition, but it is necessary to appropriately adjust the amount of RM added to achieve the purpose of adjusting the RM conversion rate, and finally form a suitable pretilt angle.

[0270] In some preferred examples, the liquid crystal composition comprises one or more compounds represented by formula V:

[0271] V;

[0272] in,

[0273] R 21 , R3 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms, R 21 Any one or more unattached -CH2- groups in the groups shown are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene.

[0274] In some more preferred examples, the compound represented by formula V is selected from the group consisting of compounds represented by the following formulas V-1 to V-10:

[0275] Ⅴ-1、 Ⅴ-2,

[0276] Ⅴ-3. Ⅴ-4,

[0277] Ⅴ-5. Ⅴ-6,

[0278] Ⅴ-7, Ⅴ-8,

[0279] Ⅴ-9, Ⅴ-10.

[0280] In some preferred examples, in the liquid crystal composition, the content of the compound represented by Formula V includes but is not limited to 15-25 wt%, 15-23 wt%, 15-22 wt%, 20-25 wt%, 20-23 wt%, 20-22 wt%, etc.

[0281] In some preferred examples, the liquid crystal composition further comprises one or more compounds represented by formula VI;

[0282] VI;

[0283] in,

[0284] R4 and R5 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms.

[0285] In some preferred examples, in the liquid crystal composition, the content of the compound represented by Formula VI includes but is not limited to 25-35 wt%, 25-30 wt%, 25-28 wt%, 27-35 wt%, 27-30 wt%, etc.

[0286] In some preferred examples, the liquid crystal composition further comprises one or more compounds represented by formula VII:

[0287] VII;

[0288] in,

[0289] R6 and R7 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, and any one or more unconnected -CH2- groups in the group represented by R6 are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene;

[0290] a represents 0 or 1;

[0291] Z1 represents a single bond, -CH2O-, -CH2CH2- or -CH=CH-;

[0292] express , or , when a represents 1, express or .

[0293] In some preferred examples, in the liquid crystal composition, the content of the compound represented by Formula VII includes but is not limited to 30-45 wt%, 30-43 wt%, 35-45 wt%, 35-43 wt%, 40-55 wt%, etc.

[0294] In some preferred examples, the liquid crystal composition further comprises one or more compounds represented by formula VIII:

[0295] VIII;

[0296] in,

[0297] R8 and R9 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms;

[0298] express , or .

[0299] In some more preferred examples, the compound represented by the aforementioned formula VIII is selected from the group consisting of compounds represented by the following formulas VIII-1 to VIII-18:

[0300] Ⅷ-1. Ⅷ-2.

[0301] Ⅷ-3. Ⅷ-4,

[0302] Ⅷ-5. Ⅷ-6,

[0303] Ⅷ-7, Ⅷ-8.

[0304] Ⅷ-9, Ⅷ-10,

[0305] Ⅷ-11, Ⅷ-12,

[0306] Ⅷ-13, Ⅷ-14,

[0307] Ⅷ-15, Ⅷ-16,

[0308] Ⅷ-17, Ⅷ-18.

[0309] In some preferred examples, in the liquid crystal composition, the content of the compound represented by Formula VIII includes but is not limited to 0, 3-20 wt%, 3-18 wt%, 3-13 wt%, 6-20 wt%, 6-18 wt%, 6-13 wt%, etc.

[0310] In this embodiment, the compound represented by the above exemplary formula V to the compound represented by the formula VIII is a liquid crystal compound.

[0311] The liquid crystal composition provided in the embodiment of the present invention has a good alignment effect, a good pretilt angle stability and a high VHR, and can achieve the same display effect as a display with PI. The liquid crystal display element or liquid crystal display including the liquid crystal composition has a wide nematic phase temperature range, very high resistivity, good UV resistance, high charge retention rate and low vapor pressure.

[0312] Unless otherwise specified, the amounts of the self-aligning agent, polymerizable compound and other additives of the present invention are added based on the relative mass percentage of the liquid crystal composition.

[0313] The liquid crystal composition in this embodiment may preferably contain one or more biphenyl compounds.

[0314] In some examples, dopants with various functions may be added to the liquid crystal compound; in the liquid crystal composition, the mass percentage content of the dopant is preferably between 0.01-1wt%.

[0315] Exemplarily, the dopant is mainly an antioxidant, a light stabilizer, and the like.

[0316] In some specific examples, the antioxidant is selected from one or more compounds represented by the following structural formulas:

[0317] , , ,

[0318] ;

[0319] Here, S represents an integer of 1-10.

[0320] In some examples, the light stabilizer is ;

[0321] in,

[0322] S represents an integer of 1-10.

[0323] [Liquid crystal display element or liquid crystal display]

[0324] Another specific embodiment of the present invention also relates to a liquid crystal display element comprising any one of the above-mentioned liquid crystal compositions; the liquid crystal display element is an active matrix display element or a passive matrix display element.

[0325] In some examples, the liquid crystal display element is preferably an active matrix addressed liquid crystal display element.

[0326] Another specific embodiment of the present invention also relates to a liquid crystal display comprising any one of the above liquid crystal compositions; the liquid crystal display is an active matrix display or a passive matrix display.

[0327] In some examples, the liquid crystal display is preferably an active matrix addressed liquid crystal display.

[0328] Exemplary active matrix display elements or displays include, but are not limited to, IPS-TFT or FFS-TFT or VA-TFT liquid crystal display elements or other TFT displays, and are particularly suitable for SAVA-TFT mode liquid crystal display elements or liquid crystal displays.

[0329] The liquid crystal display element or liquid crystal display in this embodiment has a fast response speed, good reliability and a good display viewing angle, and is mainly used in SAVA display mode, especially suitable for curved display elements or displays.

[0330] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0331] In the present invention, the preparation methods are conventional methods unless otherwise specified, the raw materials used can be obtained from public commercial channels unless otherwise specified, the percentages are mass percentages, the temperatures are degrees Celsius (°C), and the specific meanings of other symbols and test conditions are as follows:

[0332] Cp represents the clearing point of liquid crystal (℃), measured by DSC quantitative method;

[0333] Δn represents optical anisotropy, Δn=ne-no, where no is the refractive index of ordinary light, ne is the refractive index of extraordinary light, and the test conditions are 25±2℃, 589nm, and Abbe refractometer test;

[0334] Δε represents dielectric anisotropy, Δε=ε∥-ε⊥, where ε∥ is the dielectric constant parallel to the molecular axis, and ε⊥ is the dielectric constant perpendicular to the molecular axis. The test conditions are 25±0.5℃, 20μm antiparallel box, INSTEC:ALCT-IR1 test;

[0335] γ1 represents rotational viscosity (mPa·s), the test conditions are 25±0.5℃, 20 μm antiparallel cell, INSTEC:ALCT-IR1 test;

[0336] K11 is the splay elastic constant, K33 is the bending elastic constant, and the test conditions are: 25°C, INSTEC:ALCT-IR1, 20 μm antiparallel cell;

[0337] VHR stands for voltage holding ratio (%), and the test conditions are 60±1℃, voltage ±5V, pulse width 10ms, and voltage holding time 1.667ms. The test equipment is TOYO Model6254 LCD performance comprehensive tester;

[0338] The preparation method of the liquid crystal composition of the present invention is as follows:

[0339] Weigh each liquid crystal monomer according to the required ratio and put it into a stainless steel beaker. Place the stainless steel beaker containing each liquid crystal monomer on a magnetic stirring device to heat and melt. After most of the liquid crystal monomers in the stainless steel beaker are melted, add a magnetic rotor to the stainless steel beaker, stir the mixture evenly, and obtain a liquid crystal composition after cooling to room temperature.

[0340] The method for preparing the liquid crystal display device in the embodiment of the present invention is as follows:

[0341] Pour the liquid crystal composition into the test box (without polyimide alignment layer, the box thickness is 4μm, there is an ITO electrode on the substrate surface, and there is no passivation layer). In order to achieve spontaneous vertical alignment of liquid crystal molecules, two ultraviolet irradiation processes are required: UV1 and UV2. Apply 15V voltage on both sides of the test box and irradiate with an ultraviolet lamp with a main wavelength of 313nm. UV1: The irradiation time is 60s, and the irradiation intensity is 0.55mw / cm 2 ; UV2: irradiation time is 90min, irradiation intensity is 0.20mw / cm 2 After the UV irradiation process, a pre-tilt angle is formed inside the test box, causing the liquid crystal molecules to spontaneously align vertically.

[0342] Film thickness test method: Liquid crystal is poured into the test box. After the UV process reaction is completed, the film thickness formed after the reaction of the alignment agent and RM is tested by slice cutting. The test equipment model is Zeiss Sigma300.

[0343] Alignment observation method: Liquid crystal is poured into a test cell without PI. After the liquid crystal is poured, a polarizer is orthogonally attached to the test cell. The test cell with the polarizer is placed on the backlight to observe the light leakage of the cell. The alignment effect is divided into three levels:

[0344] ○ Very good alignment;

[0345] △There is light leakage at the edge and the alignment effect is not good;

[0346] ×Severe light leakage and no alignment.

[0347] The liquid crystal monomer structure of the embodiment of the present invention is represented by a code, and the code representation method of the liquid crystal ring structure, end group, and connecting group is shown in Table 1 and Table 2 below.

[0348] Table 1 Corresponding codes of ring structures

[0349]

[0350] Table 2 Corresponding codes of terminal groups and linking groups

[0351]

[0352] Example:

[0353] , its code is CC-Cp-V1;

[0354] , whose code is PPY-3-O2;

[0355] , whose code is CPY-2-O2;

[0356] , its code is CCY-3-O2;

[0357] , whose code is COY-3-O2;

[0358] , whose code is CCOY-3-O2;

[0359] , its code is CLY-3-O2.

[0360] The present invention is described below using the following specific embodiments:

[0361] Composition C Example

[0362] Composition C1

[0363] The formula of the composition and the corresponding properties are shown in Table 3 below.

[0364] Table 3 Formula of composition C1 and corresponding properties

[0365]

[0366] Composition C2

[0367] The formula of the composition and the corresponding properties are shown in Table 4 below.

[0368] Table 4 Formula of composition C2 and corresponding properties

[0369]

[0370] Composition C3

[0371] The formula of the composition and the corresponding properties are shown in Table 5 below.

[0372] Table 5 Formula of composition C3 and corresponding properties

[0373]

[0374] Composition C4

[0375] The formula of the composition and the corresponding properties are shown in Table 6 below.

[0376] Table 6 Formula of composition C4 and corresponding properties

[0377]

[0378] Composition C5

[0379] The formula of the composition and the corresponding properties are shown in Table 7 below.

[0380] Table 7 Formulation of composition C5 and corresponding properties

[0381]

[0382] Composition C6

[0383] The formula of the composition and the corresponding properties are shown in Table 8 below.

[0384] Table 8 Formula of composition C6 and corresponding properties

[0385]

[0386] Composition C7

[0387] The formula of the composition and the corresponding properties are shown in Table 9 below.

[0388] Table 9 Formulation of composition C7 and corresponding properties

[0389]

[0390] Comparison of alignment agents:

[0391] DP1: ;

[0392] DP2: ;

[0393] DP3 ;

[0394] DP4 ;

[0395] DP5 .

[0396] Liquid crystal composition:

[0397] Examples 1-15 and Comparative Examples 1-8:

[0398] The compound represented by formula I (self-aligning agent) and the compound selected from formula II to IV (polymerizable compound (RM)) were added to each of the above compositions C to form a liquid crystal composition, and the specific formula is shown in the following Table 10. In Table 10, the mass percentages of the compound represented by formula I and the compound represented by formula II to IV are all relative to the content of the composition C in the liquid crystal composition.

[0399] Table 10 Examples 1-15 and Comparative Examples 1-8

[0400]

[0401] The alignment effect is observed by observing the alignment of liquid crystal molecules on the surface of the display panel after the liquid crystal composition is dripped into the display panel. The alignment condition includes the light transmittance in the dark state when no power is applied. The smaller the light leakage when no power is applied, the better the alignment effect of the alignment agent; the arrangement of liquid crystal molecules after power is applied, the better the alignment effect if no dark lines or other poor arrangement are formed.

[0402] The thickness of the film formed after the polymerization of the self-aligning agent and RM: Generally, the thickness of the film formed by PI is about 100nm, so the film thickness of the self-aligning agent is equivalent to the thickness of PI for the best effect. The diffusion of the self-aligning agent after dripping into the panel in the liquid crystal composition determines the thickness of the film formed at different positions. The better the uniformity of the film thickness formed at different positions, the better the diffusion of the self-aligning agent. If the film thickness is not uniform, there will be differences in the display brightness at different positions of the display panel, affecting the display effect of the display panel.

[0403] The aging of the pretilt angle includes two processes: UV illumination process and backlight powered aging process. The pretilt angle data is recorded after UV irradiation is completed; the pretilt angle data is recorded after the backlight is powered on and aged for a fixed time. The operation of this experiment: UV1 irradiation for 60s, UV2 irradiation for 90 minutes, and the pretilt angle is recorded; the pretilt angle data is recorded after the backlight is powered on and aged for 168h; the final pretilt angle change data is equal to the pretilt angle data after aging minus the pretilt angle data before aging. The size of the pretilt angle will affect the voltage size when the liquid crystal molecules rotate, resulting in afterimages; for example: when the pretilt angle is 1.1°, the panel brightness is 100nit at 5V voltage, and when the pretilt angle is 1.8°, the panel brightness is 110nit at 5V voltage. Changes in the pretilt angle will affect the brightness of the panel, resulting in a difference between the designed brightness and the actual brightness, resulting in afterimages.

[0404] The VHR test is to pour the liquid crystal composition into the test piece for testing. VHR stands for voltage holding rate (%). The test conditions are 60±1℃, voltage is ±5V, pulse width is 10ms, and voltage holding time is 1.667ms. The test equipment is TOYO Model6254 liquid crystal performance comprehensive tester.

[0405] 130℃ conversion rate test method: Polymer high temperature polymerization temperature test method: Take 1g of the prepared liquid crystal composition into a 7ml sample bottle, put it in a 130℃ oven, leave it for 2h, and measure the change of the self-alignment agent content. Test equipment: Machine Instrument: Agilent1200.

[0406] Table 11 Experimental data of Examples 1-15 and Comparative Examples 1-8

[0407]

[0408] Compared with the comparative examples, the liquid crystal composition of the present invention has poor uniformity of film thickness at different positions in comparative example 1; comparative example 2 cannot form alignment and has poor reliability; comparative examples 3 and 7 have poor uniformity of film thickness at different positions; comparative examples 4 and 5 have poor alignment effects, poor uniformity of film thickness at different positions and unstable pretilt angles; comparative example 6 has poor uniformity of film thickness at different positions and poor high-temperature stability of the polymer; comparative example 8 has poor alignment effects, poor uniformity of film thickness at different positions, unstable pretilt angles and poor stability of the polymer. Therefore, the technical solution of the present invention can effectively avoid the problems of dust particles, static electricity residue, residue, brush marks and so on caused by the friction alignment type alignment layer, which reduce the yield of liquid crystal display devices. It can not only form a good alignment effect, but also ensure the uniformity of film thickness at different positions. The high-temperature stability of the polymer is good, which can effectively avoid the polymerization reaction of the polymer during the curing process of the frame glue. At the same time, the particle size of RM after the polymerization reaction is moderate, and the pretilt angle formed has good stable alignment ability. The liquid crystal display using the orientation film has good reliability, a wider viewing angle range, and can effectively improve display defects.

[0409] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that: The liquid crystal composition comprises one or more compounds represented by formula I, The compound represented by Formula I is selected from the group consisting of compounds represented by Formula I-1 to Formula I-4: Ⅰ-1； Ⅰ-2； Ⅰ-3； Ⅰ-4； in, L4 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, wherein any one or more unconnected -CH2- groups may be substituted by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, and one or more H atoms may be independently substituted by F or Cl; R1 represents a hydrogen atom, a chain alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms; Sp1 and Sp3 each independently represent a single bond or a chain alkyl group having 1 to 10 carbon atoms, wherein any one of the -CH2- groups may be substituted by -O-, -S-, -CO-, -CO-O-, -OCO-, or -O-CO-O-; P1 and P2 each independently represent a polymerizable group; R2 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms; and At least one or more selected from the group consisting of compounds represented by formula II, formula III, and formula IV, The compound represented by formula II is selected from the group consisting of compounds represented by the following formulas II-1 to II-7: Ⅱ-1、 Ⅱ-2、 Ⅱ-3、 Ⅱ-4、 Ⅱ-5、 Ⅱ-6、 Ⅱ-7； in, L5 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms; The compound represented by formula III is selected from the group consisting of compounds represented by the following formulas III-1 to III-7: Ⅲ-1、 Ⅲ-2、 Ⅲ-3、 Ⅲ-4、 Ⅲ-5、 Ⅲ-6、 Ⅲ-7； in, L6 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms; The compound represented by formula IV is selected from the group consisting of compounds represented by the following formulas IV-1 to IV-6: Ⅳ-1、 Ⅳ-2、 Ⅳ-3、 Ⅳ-4、 Ⅳ-5、 Ⅳ-6； in, L7, L8, and L9 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 7 carbon atoms; and at least one of L7, L8, and L9 represents an alkenyl group having 2 to 7 carbon atoms; Sp4, Sp5, Sp6, Sp7, Sp8, Sp9 each independently represent a single bond, a chain alkyl group having 1-5 carbon atoms, or a cyclic alkyl group having 1-5 carbon atoms, wherein any one or more unconnected -CH2- can be replaced by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, and any one or more H atoms in Sp4, Sp5, Sp8, Sp9 can be independently replaced by F or Cl, Sp6 and Sp7 are not single bonds at the same time, and at least one H atom in Sp6 and / or Sp7 is replaced by G3; G3 represents a tertiary alcohol structure of 1 to 7 carbon atoms; P4, P5, P6, P7, P8, and P9 each independently represent a polymerizable group; The polymerizable group is selected from or , where · represents the connection site.

2. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition comprises at least one compound represented by formula I-1; and / or In the liquid crystal composition, the mass percentage of the compound represented by formula I is 0.3-1.5 wt %; and / or In the liquid crystal composition, the mass percentages of the compounds represented by Formula II, Formula III, and Formula IV are each independently 0-0.5 wt %, and are not 0 at the same time.

3. The liquid crystal composition according to claim 1, characterized in that: The compound represented by formula I is selected from the group consisting of compounds represented by the following formulas I-1-1 to I-4-1: Ⅰ-1-1、 Ⅰ-1-2、 Ⅰ-1-3、 Ⅰ-1-4、 Ⅰ-1-5、 Ⅰ-2-1、 Ⅰ-3-1、 I-4-1; and / or The compound represented by formula II is selected from the group consisting of compounds represented by the following formulas II-1-1 to II-1-9, formula II-2-1 or formula II-5-1: Ⅱ-1-1、 Ⅱ-1-2、 Ⅱ-1-3、 Ⅱ-1-4、 Ⅱ-1-5、 Ⅱ-1-6、 Ⅱ-1-7、 Ⅱ-1-8、 Ⅱ-1-9、 Ⅱ-2-1、 II-5-1; and / or The compound represented by formula III is selected from the group consisting of compounds represented by the following formulas III-1-1 to III-3-2: Ⅲ-1-1、 Ⅲ-1-2、 Ⅲ-1-3、 Ⅲ-1-4、 Ⅲ-1-5、 Ⅲ-1-6、 Ⅲ-1-7、 Ⅲ-1-8、 Ⅲ-1-9、 Ⅲ-1-10、 Ⅲ-1-11、 Ⅲ-1-12、 Ⅲ-1-13、 Ⅲ-2-1、 Ⅲ-2-2、 Ⅲ-2-3、 Ⅲ-2-4、 Ⅲ-2-5、 Ⅲ-2-6、 Ⅲ-2-7、 Ⅲ-2-8、 Ⅲ-2-9、 Ⅲ-2-10、 Ⅲ-2-11、 Ⅲ-2-12、 Ⅲ-2-13、 Ⅲ-2-14、 III-3-1, III-3-2; and / or The compound represented by formula IV is selected from the group consisting of compounds represented by the following formulas IV-1-1 to IV-6-6: Ⅳ-1-1、 Ⅳ-1-2、 Ⅳ-1-3、 Ⅳ-1-4、 Ⅳ-1-5、 Ⅳ-1-6、 Ⅳ-2-1、 Ⅳ-3-1、 Ⅳ-4-1、 Ⅳ-5-1、 Ⅳ-5-2、 Ⅳ-5-3、 Ⅳ-5-4、 Ⅳ-5-5、 Ⅳ-6-1、 Ⅳ-6-2、 Ⅳ-6-3、 Ⅳ-6-4、 Ⅳ-6-5、 Ⅳ-6-6。 4. The liquid crystal composition according to claim 3, characterized in that: The liquid crystal composition comprises at least one compound represented by formula I and at least one compound represented by formula II; and / or The liquid crystal composition comprises at least one compound represented by formula I, at least one compound represented by formula II and at least one compound represented by formula III; and / or The liquid crystal composition comprises at least one compound represented by formula I, at least one compound represented by formula II and at least one compound represented by formula IV; and / or The liquid crystal composition comprises at least one compound represented by formula I, at least one compound represented by formula III and at least one compound represented by formula IV; and / or The liquid crystal composition comprises at least one compound represented by formula I and at least one compound represented by formula IV; and / or The liquid crystal composition comprises at least one compound represented by formula I, at least one compound represented by formula II, at least one compound represented by formula III and at least one compound represented by formula IV.

5. The liquid crystal composition according to any one of claims 1 to 4, characterized in that: The liquid crystal composition comprises one or more compounds represented by formula V: Ⅴ； in, R 21 , R3 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms, R 21 Any one or more unattached -CH2- groups in the groups shown are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene.

6. The liquid crystal composition according to claim 5, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula VI: Ⅵ； in, R4 and R5 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms.

7. The liquid crystal composition according to claim 6, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula VII: Ⅶ； in, R6 and R7 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, and any one or more unconnected -CH2- groups in the group represented by R6 are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; a represents 0 or 1; Z1 represents a single bond, -CH2O-, -CH2CH2- or -CH=CH-; express , or , when a represents 1, express or ; and / or The liquid crystal composition further comprises one or more compounds represented by formula VIII: Ⅷ； in, R8 and R9 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms; express , or .

8. A liquid crystal display element, characterized in that: The liquid crystal display device comprises the liquid crystal composition as described in any one of claims 1 to 7, wherein the liquid crystal display device is an active matrix display device or a passive matrix display device.

9. A liquid crystal display, characterized in that: The liquid crystal display comprises the liquid crystal composition according to any one of claims 1 to 7, wherein the liquid crystal display is an active matrix display or a passive matrix display.

Images