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

Abstract

The present invention discloses a liquid crystal composition, a liquid crystal display element, and a liquid crystal display device comprising the liquid crystal composition. The liquid crystal composition comprises one or more compounds represented by Formula I and at least one or more terminal olefin liquid crystal compounds. The liquid crystal composition is a PSVA liquid crystal composition, which is particularly suitable for displays or TVs; and the liquid crystal composition has good solubility and a high polymerization temperature, and can form a dense and highly temperature-reliable film layer when used in a liquid crystal display element or a liquid crystal display device prepared by a PI-less technology. I.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal displays. More specifically, it relates to a liquid crystal composition, a liquid crystal display element, and a liquid crystal display including the liquid crystal composition. Background Art

[0002] As an important display technology, liquid crystal display screens (LCDs) have developed rapidly in recent years with the progress of display technology and the changes in market demand. The application of LED backlight technology has further reduced the power consumption of liquid crystal displays and improved the display effect. At the same time, with the maturity of technology, the application scope of liquid crystal display screens is also constantly expanding. The liquid crystal display screen industry is developing in the directions of higher contrast ratio, high resolution, high refresh rate, low power consumption, flexibility and special-shaped, 3D, etc. These technological advancements not only enhance the user experience but also bring new growth points to the industry.

[0003] PSVA display is the main display mode for TV displays, and the display panels of PSVA have also become the main products of related enterprises. However, with the continuous development of technology, how to gain an advantage in technological optimization and cost reduction is an important direction for the future development of panel factories. In common liquid crystal display devices (LCDs), there is a layer of thin film material on the color filter substrate and the TFT substrate respectively, and its main function is to align liquid crystal molecules in a certain direction, which is called the alignment layer (PI). This alignment layer is mainly divided into a rubbing alignment type and a photo-alignment type. The alignment layer has the characteristics of uniformity, adhesion, and stability. However, the alignment layer also has certain disadvantages: 1) The rubbing alignment type alignment layer is prone to problems such as dust particles, static electricity residue, residues, and brush marks during the display process of liquid crystal display devices, reducing the yield of liquid crystal display devices; 2) Since PI has high polarity and high water absorption, PI is prone to deformation during storage and transportation, resulting in uneven alignment; 3) The price of PI material is expensive, and the process of forming a film of PI material on the liquid crystal display panel is also relatively complex, thus increasing the manufacturing cost of the display panel; 4) Since the PI material is usually dissolved in an N-methylpyrrolidone (NMP) solvent to form a PI solution, and then the PI solution is used to prepare the alignment layer, the entire manufacturing process has the disadvantages of high energy consumption, environmental unfriendliness, and easy harm to the human body. Therefore, how to effectively avoid the problems brought by the above PI is an important research topic in the current display development.

[0004] With the discovery of research, the newly proposed PI-less technology can eliminate the PI coating process and directly add monomers that can play an alignment role to the liquid crystal to replace the function of PI. However, a good aligning agent needs to meet many essential conditions: 1) Good alignment effect to ensure a good dark state effect after the liquid crystal is dropped into the panel and can effectively drive the rotation of liquid crystal molecules after power-on, without problems such as alignment dark streaks; 2) Good pretilt angle stability; 3) High temperature tolerance; 4) Appropriate particle size height, etc., to ensure a better display effect. At present, the double-sided PI-less in the market is not yet mature enough, with problems such as alignment ability and reliability. What is mass-produced is single-sided with PI and the other side without PI. Therefore, how to truly achieve double-sided PI-less is an urgent problem to be solved now.

[0005] Currently, PSVA usually judges the bump height of the particles formed after the polymerization of polymerizable compounds (RM) by testing AFM (Atomic Force Microscope). The particle size height after the polymerization of RM in conventional PSVA liquid crystal is about 100 nm. If the particle size is too high, dark streaks or bright spots will appear. If the particle size is too low, the alignment force on the liquid crystal will become weak. If the particle size height range is too wide, the pretilt angle sizes at different positions will be inconsistent. Therefore, it is necessary to have an appropriate particle size height and a relatively concentrated particle size range. Similarly, in the PI-Less field, if the bump height of the particles formed by the aligning agent is uneven, dark streaks or bright spots will also appear, resulting in poor display.

[0006] The polymerization temperature of the aligning agent determines the high temperature tolerance of the liquid crystal. We know that after the liquid crystal panel is assembled and the sealant is cured, there will be a high temperature baking, the purpose of which is to make the sealant cure more completely. However, at this time, the RM and the aligning agent in the liquid crystal cannot react. If they react in advance, it may form broken bright spots or may also affect the subsequent normal UV process.

[0007] Therefore, it is an urgent technical problem to be solved at present to develop a PI-Less technical solution with good solubility, higher polymerization temperature, capable of forming a dense film layer, and having high temperature reliability. Summary of the Invention

[0008] Based on this, the purpose of the present invention is to provide a liquid crystal composition, a liquid crystal display element, and a liquid crystal display including the liquid crystal composition. The liquid crystal composition is a PSVA liquid crystal composition, especially suitable for displays or TVs; and the liquid crystal composition has good solubility and high polymerization temperature, and can form a dense and highly temperature-reliable film layer when used in a liquid crystal display element or a liquid crystal display prepared by PI-less technology.

[0009] To achieve the above purpose, the present invention adopts the following technical solutions:

[0010] On the one hand, the present invention provides a liquid crystal composition, which comprises one or more compounds represented by the formula I:

[0011] I;

[0012] Wherein,

[0013] 、 、 respectively and independently represent 、 、 、 、 、 、 or , and 、 、 at least one of which is selected from 、 、 、 、 or ;

[0014] L 1 ~L 4 each independently represents a hydrogen atom, a halogen atom, a linear alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, a linear alkoxy group having 1 to 15 carbon atoms, or a linear alkenyl group having 2 to 15 carbon atoms, wherein any one or more non-adjacent -CH 2 - can be replaced by -O-, -S-, -CO-, -CH 2 O-, -OCH 2 -, -COO-, -OOC- or an acrylate group in a form where O- or S- are not adjacent to each other, and one or more H atoms can be independently replaced by F or Cl;

[0015] R 1 represents a hydrogen atom, a linear alkyl group having 1 to 15 carbon atoms or a cyclic alkyl group having 1 to 15 carbon atoms;

[0016] Sp 1 、Sp 2 、Sp 3 each independently represents a single bond or a linear alkyl group having 1 to 10 carbon atoms, wherein any one -CH 2 - can be replaced by -O-, -S-, -CO-, -CO-O-, -OCO-, -O-CO-O-;

[0017] P 1 、P2 each independently represents a polymerizable group;

[0018] K 1 represents ;

[0019] R 2 represents a hydrogen atom, a halogen atom, a linear 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;

[0020] n represents 0 or 1; and

[0021] at least one or more terminal olefinic liquid crystal compounds.

[0022] Furthermore, the compound represented by Formula I is selected from the group consisting of compounds represented by Formula I-1 to Formula I-4:

[0023] I-1;

[0024] I-2;

[0025] I-3;

[0026] I-4;

[0027] wherein,

[0028] L 4 represents a hydrogen atom, a halogen atom, a linear alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, a linear alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, wherein any one or more non-adjacent -CH 2 - can be replaced by -O-, -S-, -CO-, -CH 2 O-, -OCH 2 -, -COO-, -OOC-, or acrylate group in a form where O- or S- are not adjacent to each other, and one or more H atoms can be independently replaced by F or Cl;

[0029] R 1 represents a hydrogen atom, a linear alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms;

[0030] Sp 1 , Sp 3 each independently represents a single bond or a linear alkyl group having 1 to 10 carbon atoms, wherein any one -CH 2 - can be replaced by -O-, -S-, -CO-, -CO-O-, -OCO-, -O-CO-O-;

[0031] P 1 、P 2 each independently represents a polymerizable group;

[0032] R 2 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cycloalkyl 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.

[0033] Furthermore, the polymerizable group is selected from or , where · represents a connection site.

[0034] Furthermore, the liquid crystal composition contains at least one compound represented by Formula I-1.

[0035] Furthermore, in the liquid crystal composition, the mass percentage of the compound represented by Formula I is 0.3-1.5 wt%.

[0036] Furthermore, in the liquid crystal composition, the mass percentage of the compound represented by Formula I is 0.4-1.0 wt%.

[0037] Furthermore, the compound represented by Formula I is selected from the group consisting of the compounds represented by the following Formulas I-1-1 to I-4-1:

[0038] I-1-1, I-1-2,

[0039] I-1-3, I-1-4,

[0040] I-1-5, I-2-1,

[0041] I-3-1, I-4-1.

[0042] Furthermore, the liquid crystal composition contains at least the compound represented by Formula I-1-3.

[0043] Furthermore, the terminal olefin liquid crystal compound is selected from the compounds represented by the following Formula II:

[0044] II;

[0045] wherein,

[0046] R 2 represents an alkenyl group having 2 to 10 carbon atoms;

[0047] R 3 represents a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atoms, or a alkenyl group having 2 to 10 carbon atoms;

[0048] m represents 1 or 2;

[0049] 、 each independently represents 、 、 or ; when m represents 2, each occurrence may be the same or different.

[0050] Furthermore, in the liquid crystal composition, the mass percentage of the compound represented by formula II is 25 - 85 wt%.

[0051] Furthermore, in the liquid crystal composition, the mass percentage of the compound represented by formula II is 25 - 50 wt%.

[0052] Furthermore, the compound represented by formula II is selected from the group consisting of the compounds represented by the following formula II-1 to II-7:

[0053] II-1, II-2,

[0054] II-3, II-4,

[0055] II-5, II-6,

[0056] II-7;

[0057] wherein,

[0058] R 2 represents a alkenyl group having 2 to 10 carbon atoms;

[0059] R 3 represents a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atoms, or a alkenyl group having 2 to 10 carbon atoms.

[0060] Furthermore, the liquid crystal composition further contains one or more compounds represented by formula III:

[0061] III;

[0062] wherein,

[0063] R 4 and R 5 each independently represents an alkyl chain having 1 to 10 carbon atoms or an alkoxy chain having 1 to 10 carbon atoms;

[0064] X 1 and X 2 and X 3 and X 4 each independently represents H or F, and at least two of X 1 and X 2 and X 3 and X 4 represent F.

[0065] Furthermore, the liquid crystal composition further contains one or more compounds represented by Formula IV:

[0066] IV;

[0067] wherein

[0068] R 6 and R 7 each independently represents an alkyl chain having 1 to 10 carbon atoms, an alkenyl chain having 2 to 10 carbon atoms or an alkoxy chain having 1 to 10 carbon atoms, and any one or more non - adjacent - CH 6 - in the group represented by R 2 - is optionally substituted by cyclopentylene, cyclopentenylene, cyclobutylene or cyclopropylene;

[0069] X represents -O-, -S- or -CH 2 O-.

[0070] On the other hand, the present invention provides a liquid crystal display element, and the liquid crystal display element contains the liquid crystal composition as described above.

[0071] On yet another hand, the present invention provides a liquid crystal display, and the liquid crystal display contains the liquid crystal composition as described above.

[0072] The beneficial effects of the present invention are as follows:

[0073] The present invention provides a PI-less technology. During the production of liquid crystal display elements or liquid crystal displays by panel factories, the use of this liquid crystal composition can eliminate the problems brought about by the PI process, and at the same time eliminate the PI cost, achieving the dual effects of cost reduction and environmental friendliness. In the liquid crystal composition provided in the present invention, adding a compound represented by Formula I with a specific structure containing a heterocyclic structure to the liquid crystal compound can achieve the same effect as PI through self-alignment. During the preparation of the device, the compound represented by Formula I in the liquid crystal composition can form a dense film layer, effectively preventing ions in other film layers from penetrating into the liquid crystal and affecting the VHR of the liquid crystal; at the same time, it is combined with an end-alkene liquid crystal compound that can inhibit the reaction rate of the alignment agent, preventing the risk of broken bright spots caused by too fast UV1 reaction, and at the same time ensuring the uniformity of the bump height of the film layer formed after the reaction; the invention also has high temperature reliability and can avoid the risk of self-polymerization caused by high temperature during the curing of the sealant. Detailed Embodiments

[0074] To more clearly illustrate the present invention, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention.

[0075] According to a specific embodiment of the present invention, a liquid crystal composition is provided, and the liquid crystal composition contains one or more compounds represented by Formula I:

[0076] Ⅰ;

[0077] Wherein,

[0078] , , respectively independently represent , , , , , , or , and , , at least one of them is selected from , , , , or ;

[0079] L 1 ~L 4Each independently 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 non - adjacent -CH 2 - can be replaced by -O-, -S-, -CO-, -CH 2 O-, -OCH 2 -, -COO-, -OOC-, or an acrylate group in a form where O- or S- are not adjacent to each other, and one or more H atoms can be independently replaced by F or Cl;

[0080] R 1 represents a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms;

[0081] Sp 1 、Sp 2 、Sp 3 Each independently represents a single bond or an alkyl group having 1 to 10 carbon atoms, wherein any one -CH 2 - can be replaced by -O-, -S-, -CO-, -CO - O-, -OCO-, -O - CO - O-;

[0082] P 1 、P 2 Each independently represents a polymerizable group;

[0083] K 1 represents ;

[0084] R 2 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;

[0085] n represents 0 or 1; and

[0086] at least one or more terminal - olefin - type liquid crystal compounds.

[0087] In this embodiment, in the liquid crystal composition, the compound represented by formula I is used in combination with a terminal - olefin - type liquid crystal compound, so that when the liquid crystal composition is used in the preparation of a liquid crystal display device, the formed film layer has excellent bump height stability, alignment ability, good film thickness uniformity, aging resistance, structural stability, and a more stable pre - tilt angle, etc.

[0088] In this embodiment, the terminal - olefin - type liquid crystal compound can inhibit the reaction of the alignment agent from being too fast, avoiding the risk of generating large particles due to too fast polymerization and forming broken bright spots, and it does not belong to polymerizable compounds (RM).

[0089] Preferably, the polymerizable group is selected from a methacrylate group or an acrylate group.

[0090] In some preferred examples, Sp 2 represents a linear alkyl group having 1 to 10 carbon atoms, wherein any one of -CH 2 - can be replaced by -O-, -S-, -CO-, -CO-O-, -OCO-, -O-CO-O-.

[0091] In some specific examples, the polymerizable group in the present embodiment is selected from or , wherein · represents a bonding site.

[0092] 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,

[0093] I-1;

[0094] I-2;

[0095] I-3;

[0096] I-4;

[0097] wherein,

[0098] L 4 represents a hydrogen atom, a halogen atom, a linear alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, a linear alkoxy group having 1 to 15 carbon atoms or a linear alkenyl group having 2 to 15 carbon atoms, wherein any one or more non-adjacent -CH 2 - can be replaced by -O-, -S-, -CO-, -CH 2 O-, -OCH 2 -, -COO-, -OOC- or an acrylate group in a form where O- or S- are not adjacent to each other, and one or more H atoms can be independently replaced by F or Cl;

[0099] R 1 represents a hydrogen atom, a linear alkyl group having 1 to 15 carbon atoms or a cyclic alkyl group having 1 to 15 carbon atoms;

[0100] Sp 1 , Sp 3 each independently represents a single bond or a linear alkyl group having 1 to 10 carbon atoms, wherein any one of -CH 2 - can be replaced by -O-, -S-, -CO-, -CO-O-, -OCO-, -O-CO-O-;

[0101] P 1 、P 2 each independently represents a polymerizable group;

[0102] R 2 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cycloalkyl 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.

[0103] In some examples, the polymerizable group is selected from or , where · represents the connection site.

[0104] In some preferred examples, the liquid crystal composition contains at least one compound represented by Formula I-1. The compound represented by Formula I-1 is combined with a liquid crystal containing an olefin compound, so that the bump stability, alignment ability, film thickness uniformity, aging resistance, structural stability, pretilt angle stability, etc. of the formed film layer are better.

[0105] In some preferred examples, the compound represented by Formula I is selected from the group consisting of the compounds represented by the following Formulas I-1-1 to I-4-1:

[0106] I-1-1, I-1-2,

[0107] I-1-3, I-1-4,

[0108] I-1-5, I-2-1,

[0109] I-3-1, I-4-1.

[0110] In some preferred examples, the liquid crystal composition contains at least the compound represented by Formula I-1-3. The compound represented by Formula I-1-3 is combined with a liquid crystal containing an olefin compound, so that the bump stability, alignment ability, film thickness uniformity, aging resistance, structural stability, pretilt angle stability, etc. of the formed film layer are better.

[0111] In some preferred examples, the mass percentage content of the compound represented by Formula I-1-3 includes but is not limited to 0.3-1.5%, 0.4-1.4%, 0.5-1.2%, etc.

[0112] In this embodiment, due to different substituents, the dissolution properties of the compound represented by Formula I in the liquid crystal composition will vary slightly, but an addition amount of 0.3-1.5 wt% by mass in the liquid crystal composition can be achieved. Since the polymer formed by the compound represented by Formula I is to play the insulating role of PI, a certain thickness is necessary, so the compound represented by Formula I should have sufficient solubility and addition amount. In some examples, in the liquid crystal composition, the mass percentage of the compound represented by Formula I includes, but is not limited to, 0.3-1.5%, 0.4-1.4%, 0.5-1.2%, etc.

[0113] In some preferred examples, the terminal olefin liquid crystal compound is selected from the compounds represented by the following Formula II:

[0114] II;

[0115] Wherein,

[0116] R 2 represents an alkenyl group having 2-10 carbon atoms;

[0117] R 3 represents an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms or an alkenyl group having 2-10 carbon atoms;

[0118] m represents 1 or 2;

[0119] , each independently represents , , or ; when m represents 2, each occurrence may be the same or different.

[0120] In some examples, in the liquid crystal composition, the mass percentage of the compound represented by Formula II is 25-85 wt%. In some specific examples, in the liquid crystal composition, the mass percentage of the compound represented by Formula II includes, but is not limited to, 25-60 wt%, 25-50 wt%, 30-50 wt%, 30-40 wt%, 40-60 wt%, etc.

[0121] In some preferred examples, the compound represented by Formula II is selected from the group consisting of the compounds represented by the following Formula II-1 to II-7:

[0122] II-1, II-2,

[0123] II-3, II-4,

[0124] Ⅱ-5, Ⅱ-6,

[0125] Ⅱ-7;

[0126] Among them,

[0127] R 2 represents an alkenyl group having 2 to 10 carbon atoms;

[0128] R 3 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.

[0129] The liquid crystal composition of the present invention, preferably, the liquid crystal composition further comprises one or more compounds represented by Formula Ⅲ,

[0130] Ⅲ;

[0131] Among them,

[0132] R 4 and R 5 each independently represent an alkyl group having 1 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms;

[0133] X 1 and X 2 and X 3 and X 4 each independently represent H or F, and at least two of X 1 and X 2 and X 3 and X 4 represent F.

[0134] In some examples, in the liquid crystal composition, the mass percentage content of the compound represented by Formula Ⅲ is 1-15 wt%. In some specific examples, in the liquid crystal composition, the mass percentage content of the compound represented by Formula Ⅲ includes, but is not limited to, 1-11 wt%, 1-8 wt%, 3-12 wt%, 3-8 wt%, 4-8 wt%, etc.

[0135] In some preferred examples, the liquid crystal composition further comprises one or more compounds represented by Formula Ⅳ,

[0136] Ⅳ;

[0137] Among them,

[0138] R 6 and R 7Each independently represents 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, R 6 Any one or more non - adjacent - CH in the groups shown 2 - Optionally substituted by cyclopentylidene, cyclopentenylidene, cyclobutylidene or cyclopropylidene;

[0139] X represents - O -, - S - or - CH 2 O-.

[0140] In some examples, in the liquid crystal composition, the mass percentage of the compound represented by formula Ⅳ is 2 - 12 wt%. In some specific examples, in the liquid crystal composition, the mass percentage of the compound represented by formula Ⅳ includes, but is not limited to, 2 - 8 wt%, 2 - 7 wt%, 2 - 5 wt%, 3 - 8 wt%, 4 - 8 wt%, etc.

[0141] In some preferred examples, the compound represented by formula Ⅳ is selected from the group consisting of the compounds represented by the following formula Ⅳ - 1 to Ⅳ - 14,

[0142] Ⅳ - 1, Ⅳ - 2,

[0143] Ⅳ - 3, Ⅳ - 4,

[0144] Ⅳ - 5, Ⅳ - 6,

[0145] Ⅳ - 7, Ⅳ - 8,

[0146] Ⅳ - 9, Ⅳ - 10,

[0147] Ⅳ - 11, Ⅳ - 12,

[0148] Ⅳ - 13, Ⅳ - 14.

[0149] In some preferred examples, the liquid crystal composition further contains one or more compounds represented by formula Ⅴ,

[0150] Ⅴ;

[0151] Wherein,

[0152] R 8 、R 9Each independently represents an alkyl chain having 1 to 10 carbon atoms or an alkoxy chain having 1 to 10 carbon atoms, R 8 Any one or more non - adjacent - CH in the groups shown 2 - Optionally substituted by cyclopentylene, cyclopentenylene, cyclobutylene or cyclopropylene;

[0153] Z represents a single bond, -CH 2 O-, -CH 2 CH 2 - or -CH=CH;

[0154] a represents 0, 1 or 2;

[0155] represents , , , or .

[0156] In some examples, the liquid crystal composition further comprises one or more polymerizable compounds. It can be understood that in the liquid crystal composition of this embodiment, there may or may not be polymerizable compounds, and their presence does not affect the desired effect.

[0157] In some specific examples, the polymerizable compound is selected from the group consisting of compounds represented by the following formula RM1 - RM6,

[0158] RM1, RM2,

[0159] RM3, RM4,

[0160] RM5, RM6.

[0161] The liquid crystal composition provided by the present invention has a low viscosity and a large elastic constant, and can achieve fast response. At the same time, the alignment agent (the compound shown in formula I) in the liquid crystal composition has a fast reaction rate, which can greatly shorten the UV2 irradiation time and improve the production efficiency. The liquid crystal display element or liquid crystal display comprising this liquid crystal composition has a wide nematic phase temperature range and can be applied in various places, and at the same time has properties such as high reliability and high resistivity.

[0162] Unless otherwise specified, the addition amounts of the compound shown in formula I of the present invention, the terminal - olefin liquid crystal compound and other additives are all added based on the relative mass percentage content of the liquid crystal composition.

[0163] In some examples, dopants with various functions can also be added to the liquid crystal composition; in the liquid crystal composition, the mass percentage content of the dopant is preferably between 0.01-0.1 wt%.

[0164] Exemplarily, the dopants are mainly antioxidants, light stabilizers, etc.

[0165] In some specific examples, the antioxidant is selected from one or more of the compounds represented by the following structural formulas,

[0166] 、 、

[0167] 、 ;

[0168] wherein, S represents an integer from 1 to 10.

[0169] In some examples, the light stabilizer is

[0170] ;

[0171] wherein,

[0172] S represents an integer from 1 to 10.

[0173] [Liquid crystal display element or liquid crystal display]

[0174] Another specific embodiment of the present invention also relates to a liquid crystal display element comprising any one of the above liquid crystal compositions; the liquid crystal display element is an active matrix display element or a passive matrix display element.

[0175] In some examples, the liquid crystal display element is preferably an active matrix addressed liquid crystal display element.

[0176] 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.

[0177] In some examples, the liquid crystal display is preferably an active matrix addressed liquid crystal display. Exemplary active matrix display elements or displays include but are not limited to, for example, 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.

[0178] The liquid crystal display element or liquid crystal display in this embodiment has a fast response speed, good reliability and a good viewing angle, and is mainly applied to the SAVA display mode, and is particularly suitable for curved display elements or displays.

[0179] Embodiment

[0180] To more clearly illustrate the present invention, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention.

[0181] In the present invention, the preparation method is a conventional method unless otherwise specified, and the raw materials used can be obtained from public commercial channels unless otherwise specified. The percentages are all by mass percentage, the temperature is in degrees Celsius (°C), and the specific meanings and test conditions of other symbols are as follows:

[0182] Cp represents the clearing point of the liquid crystal (°C), tested by DSC quantitative method;

[0183] Δn represents the optical anisotropy, Δn = ne - no, where no is the refractive index of the ordinary light and ne is the refractive index of the extraordinary light. The test conditions are 25 ± 2 °C, 589 nm, tested by an Abbe refractometer;

[0184] Δε represents the 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 °C, 20 μm antiparallel cell, tested by INSTEC: ALCT - IR1;

[0185] γ1 represents the rotational viscosity (mPa·s), tested under the conditions of 25 ± 0.5 °C, 20 μm antiparallel cell, tested by INSTEC: ALCT - IR1;

[0186] K11 is the splay elastic constant and K33 is the bend elastic constant. The test conditions are: 25 °C, INSTEC: ALCT - IR1, 20 μm antiparallel cell;

[0187] VHR represents the voltage holding ratio (%), and the test conditions are 60 ± 1 °C, voltage of ±5 V, pulse width of 10 ms, voltage holding time of 1.667 ms. The test equipment is a TOYO Model6254 comprehensive liquid crystal performance tester;

[0188] The preparation method of the liquid crystal composition is as follows: Weigh each liquid crystal monomer according to a certain ratio and put it into a stainless - steel beaker. Place the stainless - steel beaker containing each liquid crystal monomer on a magnetic stirring instrument and heat it to melt. After most of the liquid crystal monomers in the stainless - steel beaker have melted, add a magnetic rotor to the stainless - steel beaker, stir the mixture evenly, and cool it to room temperature to obtain the liquid crystal composition.

[0189] The preparation method of an exemplary liquid crystal display device is as follows: the liquid crystal composition is poured into a test box (without a 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 the liquid crystal molecules, two ultraviolet irradiation processes are required: UV1 and UV2. A 15V voltage is applied to both sides of the test box, and an ultraviolet lamp with a main wavelength of 313nm is used for irradiation. UV1: The irradiation time varies from 30s to 60s, and the irradiation intensity is 0.55mw / cm 2 ; UV2: irradiation time ranges from 10 to 60 minutes, and the irradiation intensity is 0.20 mw / 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.

[0190] Bump height test method: Liquid crystal is poured into the test box, and after the UV process reaction is completed, the particle height on the panel surface after the alignment agent reaction is tested by slice cutting. The test equipment model is Park systems NX10.

[0191] Alignment observation method: Liquid crystal is poured into a test box without PI. After the liquid crystal is poured, a polarizer is orthogonally attached to the test box. The test box with the polarizer is placed on the backlight to observe the light leakage of the test box. The alignment effect is divided into three levels:

[0192] ○The alignment is very good, no light leakage;

[0193] △The alignment effect is not good, and there is light leakage at the edge;

[0194] ×No alignment, severe light leakage.

[0195] In the examples, the liquid crystal monomer structure 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.

[0196] Table 1 Corresponding codes of ring structures

[0197]

[0198] Table 2 Corresponding codes of terminal groups and linking groups

[0199]

[0200] Example:

[0201] , its code is CC-Cp-V1;

[0202] , whose code is PPY-3-O2;

[0203] , whose code is CPY-2-O2;

[0204] , and its code is CCY-3-O2;

[0205] , and its code is COY-3-O2;

[0206] , and its code is CCOY-3-O2;

[0207] , and its code is CLY-3-O2;

[0208] , and its code is Sb-CpO-O4;

[0209] , and its code is Sc-CpO-O4;

[0210] , and its code is PGP-Cpr1-2.

[0211] The following specific examples are used to illustrate the present invention:

[0212] Example of Composition C

[0213] Composition C1:

[0214] The formulation of the composition and the corresponding properties are shown in Table 3 below.

[0215] Table 3 Formulation and Corresponding Properties of Composition C1

[0216]

[0217] Composition C2

[0218] The formulation of the composition and the corresponding properties are shown in Table 4 below.

[0219] It should be noted here that in Composition C2, the mass percentage content of each component is relative to the total mass of other raw materials excluding RM2.

[0220] Table 4 Formulation and Corresponding Properties of Composition C2

[0221]

[0222] Composition C3

[0223] The formulation of the composition and the corresponding properties are shown in Table 5 below.

[0224] Table 5 Formulation and Corresponding Properties of Composition C3

[0225]

[0226] Composition C4

[0227] The formulation of the composition and the corresponding properties are shown in Table 6 below.

[0228] Table 6 Formulation of Composition C4 and the Corresponding Properties

[0229]

[0230] Composition C5

[0231] The formulation of the composition and the corresponding properties are shown in Table 7 below.

[0232] Table 7 Formulation of Composition C5 and the Corresponding Properties

[0233]

[0234] Composition C6

[0235] The formulation of the composition and the corresponding properties are shown in Table 8 below.

[0236] Table 8 Formulation of Composition C6 and the Corresponding Properties

[0237]

[0238] Composition C7

[0239] The formulation of the composition and the corresponding properties are shown in Table 9 below.

[0240] Table 9 Formulation of Composition C7 and the Corresponding Properties

[0241]

[0242] Composition C8

[0243] The formulation of the composition and the corresponding properties are shown in Table 10 below.

[0244] Table 10 Formulation of Composition C8 and the Corresponding Properties

[0245]

[0246] Composition C9

[0247] The formulation of the composition and the corresponding properties are shown in Table 11 below.

[0248] Table 11 Formulation of Composition C9 and the Corresponding Properties

[0249]

[0250] Comparative alignment agent:

[0251] DP1 、DP2 、

[0252] DP3 、DP4 、

[0253] DP5 。

[0254] Liquid crystal composition:

[0255] Examples 1-12 and Comparative Examples 1-12:

[0256] The compound shown in formula I (alignment agent) was added to each of the above compositions C to form a liquid crystal composition, and the specific formulation is shown in Table 12 below. Among them, in Table 12, the mass percentage content of the compound shown in formula I is relative to the content of composition C in the liquid crystal composition.

[0257] Table 12 Test data of Examples 1-12 and Comparative Examples 1-12

[0258]

[0259] The formation of the pretilt angle includes two processes, UV1 and UV2. First, UV1 irradiation is carried out. The purpose of the shorter UV1 irradiation time is to form the pretilt angle, and the longer UV2 irradiation time is to continue to react the unreacted RM or alignment agent completely.

[0260] The liquid crystal composition was respectively poured into test pieces for VHR testing; the liquid crystal composition was poured into test pieces and the height of the polymerized bump was tested by AFM (atomic force microscope testing); the liquid crystal composition was poured into a sample bottle and the conversion rate of the alignment agent was sent for testing according to the experimental operation.

[0261] According to the examples and comparative examples of the present invention, it can be found that the technical solution of the present invention has good alignment effect and fast reaction rate, which can improve the production efficiency of the panel and reduce costs. Comparing the technical solution of the present invention with Comparative Example 1, Comparative Example 3, Comparative Example 5 - Comparative Example 7, and Comparative Example 8 - Comparative Example 12, it can be seen that the UV2 irradiation time of the technical solution of the present invention is significantly shortened, which can improve the actual production efficiency of the panel factory; comparing with Comparative Example 2, it can be seen that the technical solution of the present invention has better alignment effect and shorter UV2 time; comparing with Comparative Example 4, although the technical solution of Comparative Example 4 also has shorter UV2 time and better alignment effect, the formed pretilt angle is too large, there is a risk of broken bright dots. In Comparative Example 1, the particle size formed after the reaction of RM and the alignment agent is relatively small, and the residue of the alignment agent is relatively high; in Comparative Example 2, the particle size range formed after the reaction of the alignment agent is wide, the formed particles have poor uniformity, and the residue of the alignment agent is relatively high; in Comparative Example 3 and Comparative Example 4, the particle size range formed after the reaction of the alignment agent is wide, and the bump height is significantly higher than that of other examples, there is a high risk of broken bright dots. The alignment effect of Comparative Example 5 is not very good, the formed bump height has poor uniformity, and the compactness is worse than that of the liquid crystal composition of the example of the present invention, resulting in a lower VHR than that of the composition of the example of the present invention. Comparative Example 12 has the same problem as Comparative Example 5; therefore, in the liquid crystal composition provided in this embodiment, the alignment agent formed by the compound shown in Formula I can ensure that the alignment agent forms a dense film layer, effectively preventing ions in other film layers from penetrating into the liquid crystal and affecting the VHR of the liquid crystal; at the same time, the terminal olefin liquid crystal compound in the liquid crystal mixture can inhibit the reaction rate of the alignment agent, ensuring the uniformity of the bump height formed after the reaction of the alignment agent, and preventing the risk of broken bright dots caused by too fast UV1 reaction; at the same time, it has high temperature reliability, avoiding the risk of self-polymerization caused by high temperature during the curing of the sealant.

[0262] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the embodiments here. Any obvious changes or modifications derived from the technical solution of the present invention still fall 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-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 terminal olefinic liquid crystal compounds; The terminal olefin liquid crystal compound is selected from the compound represented by the following formula II: Ⅱ； in, R2 represents an alkenyl group having 2 to 10 carbon atoms; R3 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; m means 1 or 2; , Each independently expresses , , or ; When m represents 2, Can be the same or different each time it occurs.

2. The liquid crystal composition according to claim 1, characterized in that: The polymerizable group is selected from or , wherein · represents a connection site; and / or 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 group consisting of the one or more compounds represented by Formula I-1 to Formula I-4 is 0.3-1.5wt%.

3. The liquid crystal composition according to claim 2, characterized in that: The compounds represented by Formula I-1 to Formula I-4 are selected from the group consisting of the 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。 4. The liquid crystal composition according to claim 3, characterized in that: The liquid crystal composition at least comprises the compound represented by formula I-1-3.

5. The liquid crystal composition according to claim 1, characterized in that: In the liquid crystal composition, the mass percentage of the compound represented by formula II is 25-85wt%; or In the liquid crystal composition, the mass percentage of the compound represented by formula II is 25-50wt%.

6. The liquid crystal composition according to claim 5, characterized in that: 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。 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 III: Ⅲ； in, R4 and R5 each independently represent a chain alkyl group having 1 to 10 carbon atoms or a chain alkoxy group having 1 to 10 carbon atoms; X1, X2, X3, and X4 each independently represent H or F, and at least two of X1, X2, X3, and X4 represent F; and / or The liquid crystal composition further comprises one or more compounds represented by formula IV: Ⅳ； 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- in the group represented by R6 is optionally substituted by cyclopentylene, cyclopentenylene, cyclobutylene or cyclopropylene; X represents -O-, -S- or -CH2O-.

8. A liquid crystal display element, characterized in that: It comprises the liquid crystal composition according to any one of claims 1 to 7.

9. A liquid crystal display, characterized in that: It comprises the liquid crystal composition according to any one of claims 1 to 7.

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