Liquid crystal composition and display panel

Abstract

The invention discloses a liquid crystal composition and a display panel. The liquid crystal composition comprises a liquid crystal compound, a self-alignment compound and polymerizable compounds, the polymerizable compounds comprise a first polymerizable compound, the chemical structural formula of the self-alignment compound is shown as a formula I, and the chemical structural formula of the first polymerizable compound is shown as a formula II-1; according to the liquid crystal composition, the self-alignment function can be achieved through the self-alignment compound shown in the formula I, preparation of a PI alignment layer is reduced, then the manufacturing process of the display panel is reduced, the manufacturing cost of the display panel is reduced, the angular rate of the liquid crystal composition in the alignment process can be reduced through the first polymerizable compound shown in the formula II-1, and the liquid crystal composition can be applied to the display panel. And the illumination uniformity is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a liquid crystal composition and a display panel. Background Art

[0002] Liquid crystal materials are widely used in various display devices such as mobile phones, televisions and computers. Liquid crystal plays the role of a "light valve" in a thin film transistor liquid crystal display (TFT-LCD), which controls the amount of backlight transmitted to adjust the brightness of the display device.

[0003] The traditional vertical alignment (VA) liquid crystal display panel consists of a TFT substrate, a color filter (CF) substrate, a polyimide (PI) alignment layer and a liquid crystal composition sandwiched between the two substrates. The liquid crystal molecules in the liquid crystal composition are vertically aligned through the PI alignment layer. When the external voltage is 0V, the long axis direction of the liquid crystal molecules in the VA mode display is perpendicular to the glass substrate; after the natural light passes through the polarizer on the TFT substrate side, it forms linearly polarized light. At this time, its polarization state and polarization direction cannot be changed by the liquid crystal molecules, and thus it is absorbed by the polarizer on the CF substrate side, that is, the incident light perpendicular to the glass substrate cannot pass through, and the display presents a dark state effect. Therefore, VA mode display devices usually have negative dielectric anisotropy (Δε) and high contrast.

[0004] At present, liquid crystal display panels have many devices and film layer structures, which require a large number of process steps to prepare. Therefore, it is necessary to develop liquid crystal materials suitable for reducing the process technology. Summary of the invention

[0005] The embodiments of the present application provide a liquid crystal composition and a display panel. The self-alignment compound in the liquid crystal composition can realize vertical alignment of the liquid crystal material without the need for a polyimide alignment layer, thereby simplifying the manufacturing process of the liquid crystal display panel.

[0006] The embodiment of the present application provides a liquid crystal composition, which includes a liquid crystal compound, a self-alignment compound and a polymerizable compound, wherein the polymerizable compound includes a first polymerizable compound, the chemical structural formula of the self-alignment compound is shown in Formula I, and the chemical structural formula of the first polymerizable compound is shown in Formula II-1;

[0007]

[0008]

[0009] Wherein, R1 is selected from H, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, and an aromatic group having 3 to 10 carbon atoms; any one or multiple non-adjacent -CH2- in R1 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-; one or more H in R1 is unsubstituted or substituted by one of F, Cl, Br, and I;

[0010] Z1, Z2 and Z3 are selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, an alkylene group having 1 to 10 carbon atoms, an alkenylene group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, any non-adjacent -CH2- in Z1, Z2 and Z3 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in Z1, Z2 and Z3 is unsubstituted or substituted by one of F, Cl, Br, I;

[0011] X is selected from a single bond, -O-, -S-, -CO-, -CH2- or -CF2-;

[0012] L is selected from H, F, Cl, CF3, Sp, an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, an alkenyloxy group having 2-10 carbon atoms, an alkynyl group having 2-10 carbon atoms, an alkynyloxy group having 2-10 carbon atoms, a cycloalkyl group having 3-10 carbon atoms, an aromatic group having 3-10 carbon atoms, any one or multiple non-adjacent -CH2- in L is unsubstituted or substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in L is unsubstituted or substituted by one of F, Cl, Br, and I;

[0013] Selected from in Any non-adjacent -CH2- in is unsubstituted or substituted with -O-;

[0014] Sp is selected from an ether group, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group or a polymerizable group, and at least one Sp is selected from a polymerizable group;

[0015] T is selected from a group containing a hydroxyl group;

[0016] The H on the benzene ring in the self-aligning compound is unsubstituted or substituted by F, Cl, Br, CN, SCN, NCS, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or an alkynyloxy group having 2 to 10 carbon atoms;

[0017] R2, R3, R4 and R5 are selected from H, F, CF3, alkyl having 1-5 carbon atoms, alkoxy having 1-5 carbon atoms, alkenyl having 2-5 carbon atoms, alkenyloxy having 2-5 carbon atoms, and one or more H in R2, R3, R4 and R5 is unsubstituted or substituted by one of F, Cl, Br, I;

[0018] n is selected from 1, 2 or 3;

[0019] a, b, c and d are selected from 0, 1, 2 or 3, and the sum of a and b is greater than or equal to 1;

[0020] p and q are selected from 0, 1 or 2;

[0021] e and f are selected from 0, 1 or 2, and the sum of e and f is greater than or equal to 1.

[0022] In one embodiment of the present application, T is selected from the structure shown in formula (1):

[0023]

[0024] Among them, R8, R9 and R 10 is selected from H, OH, F, Cl, Br, CN, SCN, NCS, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, R8, R9 and R 10 The terminal group is unsubstituted or substituted by one of OH, CN, CF3, R8, R9 and R 10One or more -CH2- in is unsubstituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C- and the heteroatom is not directly bonded, R8, R9 and R 10 One or more H in is unsubstituted or substituted by one of F, Cl, Br, and I;

[0025] R8, R9 and R 10 At least one of the groups has a hydroxyl terminal group;

[0026] Z4 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, an alkylene group having 1 to 10 carbon atoms, an alkenylene group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, any non-adjacent -CH2- in Z4 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in Z4 is unsubstituted or substituted by one of F, Cl, Br, and I;

[0027] k is selected from any integer between 0 and 10.

[0028] In one embodiment of the present application, Sp is selected from the structure shown in formula (2) or formula (3):

[0029]

[0030] wherein Z5 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, an alkylene group having 1 to 10 carbon atoms, an alkenylene group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, any non-adjacent -CH2- in Z5 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in Z5 is unsubstituted or substituted by one of F, Cl, Br, and I;

[0031] m is selected from any integer between 0 and 10.

[0032] In one embodiment of the present application, the self-aligning compound is selected from any one of the compounds represented by the following formula I-1 to formula I-20:

[0033]

[0034]

[0035] Wherein, a and b are selected from 0, 1 or 2, and the sum of a and b is greater than or equal to 1;

[0036] n is selected from 1 or 2;

[0037] Sp is selected from an ether group, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group or a polymerizable group, and at least one Sp in each of Formulas I-1 to I-20 is selected from a polymerizable group;

[0038] T is selected from a group containing a hydroxyl group.

[0039] In one embodiment of the present application, the self-aligning compound is selected from any one of the compounds represented by the following formula I-1-1 to formula I-20-4:

[0040]

[0041]

[0042]

[0043]

[0044]

[0045]

[0046]

[0047] In one embodiment of the present application, the first polymerizable compound is selected from any one of the following compounds:

[0048]

[0049] In one embodiment of the present application, the polymerizable compound further includes a second polymerizable compound, and the chemical structural formula of the second polymerizable compound is shown in Formula II-2;

[0050]

[0051] In one embodiment of the present application, the second polymerizable compound is selected from any one of the following compounds:

[0052]

[0053] In one embodiment of the present application, the polymerizable compound further includes a third polymerizable compound, and the chemical structural formula of the third polymerizable compound is shown in Formula II-3;

[0054]

[0055] In one embodiment of the present application, the third polymerizable compound is selected from any one of the following compounds:

[0056]

[0057] According to the above-mentioned purpose of the present application, an embodiment of the present application further provides a display panel, which includes:

[0058] a first substrate;

[0059] a second substrate, arranged opposite to the first substrate;

[0060] a liquid crystal layer, disposed between the first substrate and the second substrate;

[0061] The alignment layer is at least arranged on a side of the first substrate close to the liquid crystal layer, and the alignment layer is formed by polymerizing the self-alignment compound and the polymerizable compound in the above liquid crystal composition.

[0062] The present application provides a liquid crystal composition and a display panel, wherein the liquid crystal composition comprises a self-alignment compound as represented by formula I. When the liquid crystal composition is disposed between two substrates, the self-alignment compound and the polymerizable compound can undergo a polymerization reaction under ultraviolet light irradiation, thereby forming a polymer layer on the surface of the substrate; at the same time, the rigid chain group in the self-alignment compound acts as a steric obstacle perpendicular to the substrate surface, thereby guiding the liquid crystal molecules to be arranged perpendicular to the substrate, realizing the self-alignment function, reducing the preparation of the PI alignment layer, reducing the process technology of the display panel, and reducing the preparation cost of the display panel; in addition, the present application further adds a first polymerizable compound as represented by formula ⅠⅠ-1 to the liquid crystal composition, wherein an alkenyl group is formed between two benzene rings in the first polymerizable compound, and the alkenyl group can destroy the electron cloud structure of the main chain benzene ring, and the polymerization reaction activity is reduced under ultraviolet light (for example, the light wavelength is λ=313nm), and the reaction rate is slowed down, thereby reducing the angular rate of the liquid crystal composition during the alignment process and improving the uniformity of light illumination.

[0063] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0065] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0066] Figure 1 A schematic diagram of the structure of a display panel provided in an embodiment of the present application.

[0067] Description of reference numerals:

[0068] 11. First substrate; 12. Second substrate; 13. Liquid crystal layer; 14. Alignment layer; 141. First alignment layer; 142. Second alignment layer. DETAILED DESCRIPTION

[0069] The present application will be further described in detail below in conjunction with the accompanying drawings provided by the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. The description order of the following embodiments is not used as a limitation on the preferred order of the embodiments.

[0070] Unless otherwise defined, all terms (including technical and scientific terms) used in this document have the same meaning as commonly understood by one of ordinary skill in the art to which this general inventive concept belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless clearly so defined herein.

[0071] In the present application, aromatic group, aromatic series and aromatic ring system have the same meaning and can be interchanged.

[0072] In the present application, heteroaromatic group, heteroaromatic series and heteroaromatic ring system have the same meaning and can be interchanged.

[0073] In the present application, "substituted" means that a hydrogen atom in a substituted group is replaced by a substituent.

[0074] In the present application, when the same substituent appears multiple times, it can be independently selected from the same or different groups. If the general formula contains multiple R, then R can be independently selected from different or the same groups.

[0075] In the present application, "substituted or unsubstituted" means that the defined group may be substituted or unsubstituted. When the defined group is substituted, it should be understood that the defined group may be substituted by one or more substituents R, wherein R is selected from but not limited to: deuterium atom, cyano group, isocyano group, nitro group or halogen (e.g., F, Cl, Br or I), alkyl group containing 1-20 carbon atoms, heterocyclic group containing 3-20 ring atoms, aromatic group containing 6-20 ring atoms, heteroaromatic group containing 5-20 ring atoms, -NR'R", silane group, carbonyl group, alkoxycarbonyl group, aryloxycarbonyl group, carbamoyl group, haloformyl group, formyl group, isocyanate group, thiocyanate group, isothiocyanate group, hydroxyl group, trifluoromethyl group, and the above groups may be further substituted by substituents acceptable in the art; it is understood that R' and R" in -NR'R" are independently selected from but not limited to: H, deuterium atom, cyano group, isocyanate group, isothiocyanate group, hydroxyl group, trifluoromethyl group. Cyano, nitro or halogen (such as F, Cl, Br or I), alkyl containing 1-10 carbon atoms, heterocyclic group containing 3-20 ring atoms, aromatic group containing 6-20 ring atoms, heteroaromatic group containing 5-20 ring atoms. Preferably, R is selected from but not limited to: deuterium atom, cyano, isocyano, nitro or halogen (such as F, Cl, Br or I), alkyl containing 1-10 carbon atoms, heterocyclic group containing 3-10 ring atoms, aromatic group containing 6-20 ring atoms, heteroaromatic group containing 5-20 ring atoms, silane group, carbonyl, alkoxycarbonyl, aryloxycarbonyl, carbamoyl, haloformyl, formyl, isocyanate, thiocyanate, isothiocyanate, hydroxyl, trifluoromethyl, and the above groups can also be further substituted by substituents acceptable in the art.

[0076] In the present application, "ring atoms" refers to the number of atoms in the atoms constituting the ring itself of a structural compound (e.g., a monocyclic compound, a condensed ring compound, a cross-linked compound, a carbocyclic compound, a heterocyclic compound) obtained by atoms bonding to form a ring. When the ring is substituted by a substituent, the atoms contained in the substituent are not included in the ring atoms. The same is true for the "ring atoms" described below, unless otherwise specified. For example, the number of ring atoms of a benzene ring is 6, the number of ring atoms of a naphthalene ring is 10, and the number of ring atoms of a thienyl group is 5.

[0077] In the present application, "aryl" or "aromatic group" refers to an aromatic hydrocarbon group whose ring atoms derived from an aromatic ring compound by removing a hydrogen atom are all carbon atoms. It can be a monocyclic aromatic group, a condensed aromatic group, or a polycyclic aromatic group. For a polycyclic ring, at least one is an aromatic ring system. For example, "substituted or unsubstituted aryl having 6 to 40 ring atoms" refers to an aryl group containing 6 to 40 ring atoms, preferably a substituted or unsubstituted aryl group having 6 to 30 ring atoms, more preferably a substituted or unsubstituted aryl group having 6 to 18 ring atoms, and particularly preferably a substituted or unsubstituted aryl group having 6 to 14 ring atoms, and the aryl group is optionally further substituted; suitable examples include, but are not limited to: phenyl, biphenyl, terphenyl, naphthyl, anthracenyl, phenanthrenyl, fluoranthenyl, triphenylene, pyrenyl, perylenyl, naphthyl, fluorenyl, acenaphthene and derivatives thereof. It is understood that multiple aromatic groups may also be interrupted by short non-aromatic units (for example, based on the total number of atoms in the system, the non-aromatic units preferably contain <10% non-H atoms, such as C, N or O atoms), specifically acenaphthene, fluorene, or 9,9-diarylfluorene, triarylamine, diaryl ether systems should also be included in the definition of aromatic groups.

[0078] In the present application, "heteroaryl" or "heteroaromatic group" means that at least one carbon atom on the ring skeleton is replaced by a non-carbon atom on the basis of the aryl, and the non-carbon atom can be an N atom, an O atom, an S atom, etc. That is, the ring atoms of the heteroaryl include one or more non-carbon atoms selected from N atoms, O atoms, and S atoms. For example, "substituted or unsubstituted heteroaryl with 5 to 40 ring atoms" refers to a heteroaryl with 5 to 40 ring atoms, preferably a substituted or unsubstituted heteroaryl with 6 to 30 ring atoms, more preferably a substituted or unsubstituted heteroaryl with 6 to 18 ring atoms, and particularly preferably a substituted or unsubstituted heteroaryl with 6 to 14 ring atoms, and the heteroaryl is optionally further substituted, and suitable examples include but are not limited to: thienyl, furanyl, pyrrolyl, imidazolyl, oxadiazolyl, triazolyl, pyridyl, bipyridyl, pyrimidyl, Triazine, acridinyl, pyridazinyl, pyrazinyl, quinolyl, isoquinolyl, quinazolinyl, quinoxalinyl, phthalazinyl, pyridopyrimidinyl, pyridopyrazinyl, benzothiophenyl, benzofuranyl, indolyl, pyrroloimidazolyl, pyrrolopyrrolyl, thienopyrrolyl, thienothiphenyl, furopyrrolyl, furofuranyl, thienofuranyl, benzisoxazolyl, benzisothiazolyl, benzimidazolyl, o-naphthyl, phenanthridinyl, furidinyl, quinazolinone, dibenzothiophenyl, dibenzofuranyl, carbazolyl and derivatives thereof.

[0079] In this application, "alkyl" may refer to a fully saturated straight chain, branched chain and / or cyclic aliphatic hydrocarbon group. The carbon number of the alkyl group may be 1 to 50, 1 to 30, 1 to 20, 1 to 10 or 1 to 6. Phrases containing this term, such as "C 1-9"Alkyl" refers to an alkyl group containing 1 to 9 carbon atoms, and each occurrence may be independently C1 alkyl, C2 alkyl, C3 alkyl, C4 alkyl, C5 alkyl, C6 alkyl, C7 alkyl, C8 alkyl or C9 alkyl. Non-limiting examples of alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, isobutyl, 2-ethylbutyl, 3,3-dimethylbutyl, n-pentyl, isopentyl, neopentyl, tert-pentyl, cyclopentyl, 1-methylpentyl, 3-methylpentyl, 2-ethylpentyl, 4-methyl-2-pentyl, n-hexyl, 1-methylhexyl, 2-ethylhexyl, 2-butylhexyl, cyclohexyl, 4-methylcyclohexyl, 4-tert-butylcyclohexyl, n-heptyl, 1-methylheptyl, 2,2-dimethylheptyl, 2-ethylheptyl, 2-butylheptyl, n-octyl, tert-octyl, 2-ethyloctyl, 2-butyloctyl, 2-hexyloctyl 2-Hexyldecyl, 2-octyldecyl, 2-undecyl, 2-ethyldecyl, 2-butyldecyl, 2-hexyldecyl, 2-octyldecyl, 2-undecyl, 2-ethyldodecyl, 2-butyldodecyl, 2-hexyldodecyl, 2-octyldodecyl, 2-tridecyl, 2-tetradecyl, 2-pentadecyl, 2-hexadecyl, 2-ethylhexadecyl, 2-butylhexadecyl, 2-hexylhexadecyl, 2-octylhexadecyl, 2-heptadecyl, 2-octylhexadecyl, 2-octadecyl, 2-octadecyl, 2-nonadecyl, 2-ethyleicosyl, 2-butyleicosyl, 2-hexyleicosyl, 2-octyleicosyl, 2-heneicosyl, 2-heneicosyl, 2-heconicosyl, 2-docosyl, 2-tricosyl, 2-tetracosyl, 2-pentacosyl, 2-hexacosyl, 2-heptacosyl, 2-octacosyl, 2-nonacosyl, 2-triacontyl, etc.

[0080] In the present application, the abbreviations of substituents correspond to: n-normal, sec-secondary, i-iso, t-tertiary, o-ortho, m-meta, p-para, Me-methyl, Et-ethyl, Pr-propyl, Bu-butyl, Am-n-pentyl, Hx-hexyl, Cy-cyclohexyl.

[0081] In the present application, "amino" refers to an amine derivative having the structural characteristics of the formula -N(X)2, wherein each "X" is independently H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocyclyl, etc. Non-limiting types of amines include -NH2, -N(alkyl)2, -NH(alkyl), -N(cycloalkyl)2, -NH(cycloalkyl), -N(heterocyclyl), -NH(heterocyclyl), -N(aryl), -NH(aryl), -N(alkyl)(aryl), -N(alkyl)(heterocyclyl), -N(cycloalkyl)(heterocyclyl), -N(aryl)(heteroaryl), -N(alkyl)(heteroaryl), etc.

[0082] Herein, the term "cycloalkyl" or "cyclic alkyl" refers to a monovalent group having one or more saturated rings in which all ring members are carbon, wherein the term "alkyl" has the same meaning as described above.

[0083] In the present application, the term "heterocyclyl", "heterocyclic" or "heterocycle" refers to a fully saturated or partially unsaturated, but non-aromatic cyclic group having one or more oxygen, sulfur, silicon or nitrogen heteroatoms in the ring, the nitrogen and sulfur heteroatoms may be optionally oxidized and the nitrogen heteroatom may be optionally quaternized. The heterocyclic group may be attached at any atom or carbon atom of the ring or ring system and may be unsubstituted or substituted with one or more moieties as described above for the aryl group.

[0084] In the present application, unless otherwise defined, hydroxyl refers to -OH, carboxyl refers to -COOH, carbonyl refers to -C(=O)-, amino refers to -NH2, formyl refers to -C(=O)H, haloformyl refers to -C(=O)Z (wherein Z represents a halogen (e.g., F, Cl, Br or I)), carbamoyl refers to -C(=O)NH2, isocyanate refers to -NCO, and isothiocyanate refers to -NCS.

[0085] In the present application, the term "alkoxy" refers to a group having a structure of "-O-alkyl", i.e., an alkyl group as defined above is connected to other groups via an oxygen atom. Phrases containing the term, suitable examples include, but are not limited to, methoxy (-O-CH3 or -OMe), ethoxy (-O-CH2CH3 or -OEt) and tert-butoxy (-OC(CH3)3 or -OtBu).

[0086] In the present application, "*" connected to a single bond indicates a connection or fusion site.

[0087] In the present application, when a linking site is not specified in a group, it means that an optional linking site in the group can be used as a linking site.

[0088] In the present application, when the fusion site is not specified in the group, it means that any fusion site in the group can be used as the fusion site, and preferably two or more sites in the ortho position in the group are fusion sites.

[0089] In the present application, when a group contains multiple substituents with the same symbol, the substituents may be the same or different from each other, for example The six Rs on the benzene ring may be the same as or different from each other.

[0090] In the present application, the single bond to which the substituent is connected runs through the corresponding ring, indicating that the substituent can be connected to any position of the ring, for example In which R is connected to any substitutable position of the benzene ring; express Can be used with The benzene ring can be fused at any position.

[0091] The cyclic alkyl group or cycloalkyl group described in the present application have the same meaning and can be interchanged.

[0092] In the present application, "adjacent groups" means that there is no substitutable site between two substituents.

[0093] In the present application, "two adjacent R1 or two adjacent R3 or two adjacent R5 form a ring with each other" means a ring system formed by two adjacent R1 or two adjacent R3 or two adjacent R5 connected to each other, and the ring system can be selected from aliphatic hydrocarbon ring, aliphatic heterocycle, aromatic hydrocarbon ring or aromatic heterocycle. Preferably,

[0094] The embodiment of the present application provides a liquid crystal composition, which includes a liquid crystal compound, a self-alignment compound and a polymerizable compound, wherein the polymerizable compound includes a first polymerizable compound, the chemical structural formula of the self-alignment compound is shown in Formula I, and the chemical structural formula of the first polymerizable compound is shown in Formula II-1;

[0095]

[0096] Wherein, R1 is selected from H, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, and an aromatic group having 3 to 10 carbon atoms; any one or multiple non-adjacent -CH2- in R1 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-; one or more H in R1 is unsubstituted or substituted by one of F, Cl, Br, and I;

[0097] Z1, Z2 and Z3 are selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, an alkylene group having 1 to 10 carbon atoms, an alkenylene group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, any non-adjacent -CH2- in Z1, Z2 and Z3 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in Z1, Z2 and Z3 is unsubstituted or substituted by one of F, Cl, Br, I;

[0098] X is selected from a single bond, -O-, -S-, -CO-, -CH2- or -CF2-;

[0099] L is selected from H, F, Cl, CF3, Sp, an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, an alkenyloxy group having 2-10 carbon atoms, an alkynyl group having 2-10 carbon atoms, an alkynyloxy group having 2-10 carbon atoms, a cycloalkyl group having 3-10 carbon atoms, an aromatic group having 3-10 carbon atoms, any one or multiple non-adjacent -CH2- in L is unsubstituted or substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in L is unsubstituted or substituted by one of F, Cl, Br, and I;

[0100] Selected from in Any non-adjacent -CH2- in is unsubstituted or substituted with -O-;

[0101] Sp is selected from an ether group, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group or a polymerizable group, and at least one Sp is selected from a polymerizable group;

[0102] T is selected from a group containing a hydroxyl group;

[0103] The H on the benzene ring in the self-aligning compound is unsubstituted or substituted by F, Cl, Br, CN, SCN, NCS, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or an alkynyloxy group having 2 to 10 carbon atoms;

[0104] R2, R3, R4 and R5 are selected from H, F, CF3, alkyl having 1-5 carbon atoms, alkoxy having 1-5 carbon atoms, alkenyl having 2-5 carbon atoms, alkenyloxy having 2-5 carbon atoms, and one or more H in R2, R3, R4 and R5 is unsubstituted or substituted by one of F, Cl, Br, I;

[0105] n is selected from 1, 2 or 3;

[0106] a, b, c and d are selected from 0, 1, 2 or 3, and the sum of a and b is greater than or equal to 1;

[0107] p and q are selected from 0, 1 or 2;

[0108] e and f are selected from 0, 1 or 2, and the sum of e and f is greater than or equal to 1.

[0109] During the implementation and application process, the liquid crystal composition includes the self-alignment compound represented by formula I and the first polymerizable compound represented by formula II-1. When the liquid crystal composition is arranged between two substrates, the self-alignment compound and the polymerizable compound can undergo a polymerization reaction under ultraviolet light to form a polymer layer on the surface of the substrate; at the same time, the rigid chain group in the self-alignment compound acts as a steric obstacle perpendicular to the substrate surface, thereby guiding the liquid crystal molecules to be arranged perpendicular to the substrate, realizing the self-alignment function, reducing the preparation of the PI alignment layer, and thus reducing the process technology of the display panel and reducing the preparation cost of the display panel; in addition, the present application also adds a first polymerizable compound as shown in formula ⅠⅠ-1 to the liquid crystal composition, in which an alkenyl group is formed between two benzene rings, and the alkenyl group can destroy the electron cloud structure of the main chain benzene ring, and the polymerization reaction activity is reduced under ultraviolet light (for example, the light wavelength is λ=313nm), and the reaction rate is slowed down, thereby reducing the angular rate of the liquid crystal composition during the alignment process and improving the uniformity of light.

[0110] It should be noted that T is a group that plays an anchoring role with the substrate, and T contains a hydroxyl group, which can form a hydrogen bond with the substrate, so that the self-alignment compound can be anchored on the surface of the substrate.

[0111] In some embodiments, T is selected from the structure shown in formula (1):

[0112]

[0113] Among them, R8, R9 and R 10is selected from H, OH, F, Cl, Br, CN, SCN, NCS, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, R8, R9 and R 10 The terminal group is unsubstituted or substituted by one of OH, CN, CF3, R8, R9 and R 10 One or more -CH2- in is unsubstituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C- and the heteroatom is not directly bonded, R8, R9 and R 10 One or more H in is unsubstituted or substituted by one of F, Cl, Br, and I.

[0114] R8, R9 and R 10 At least one of the groups has a hydroxyl terminal group.

[0115] Z4 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, an alkylene group having 1-10 carbon atoms, an alkenylene group having 2-10 carbon atoms, and an alkynyl group having 2-10 carbon atoms. Any non-adjacent -CH2- in Z4 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-. One or more H in Z4 is unsubstituted or substituted by one of F, Cl, Br, and I.

[0116] k is selected from any integer between 0 and 10, for example, k can be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.

[0117] In some embodiments, Sp is selected from a branched or unbranched ether group, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group, or a polymerizable group, and at least one Sp is selected from a polymerizable group.

[0118] In some embodiments, Sp is selected from the structure shown in formula (2) or formula (3):

[0119]

[0120] Wherein, Z5 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, an alkylene group having 1-10 carbon atoms, an alkenylene group having 2-10 carbon atoms, and an alkynyl group having 2-10 carbon atoms; any non-adjacent -CH2- in Z5 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-; and one or more H in Z5 is unsubstituted or substituted by one of F, Cl, Br, and I.

[0121] m is selected from any integer between 0 and 10, for example, m can be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.

[0122] It should be noted that at least one Sp in the self-aligning compound represented by Formula I is selected from a polymerizable group, and the polymerizable group described in the above embodiment can be a group containing an unsaturated bond such as a carbon-carbon double bond or a carbon-carbon triple bond.

[0123] In some embodiments, the sum of a and b is greater than or equal to 1.

[0124] In some embodiments, a and b are selected from 0, 1 or 2, c and d are selected from 0 or 1, n is selected from 1 or 2, and p and q are selected from 0, 1 or 2.

[0125] In some embodiments, the self-aligning compound is selected from any one of the compounds represented by the following formula I-1 to formula I-20:

[0126]

[0127] Wherein, a and b each independently represent 0, 1 or 2, and the sum of a and b is greater than or equal to 1;

[0128] n is selected from 1 or 2;

[0129] Sp is selected from an ether group, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group or a polymerizable group, and at least one Sp in each of Formulas I-1 to I-20 is selected from a polymerizable group;

[0130] T is selected from a group containing a hydroxyl group.

[0131] In some embodiments, the self-aligning compound is selected from any one of the compounds represented by the following formula I-1-1 to formula I-20-4:

[0132]

[0133]

[0134]

[0135]

[0136]

[0137]

[0138]

[0139] It can be understood that in the first polymerizable compound shown in formula II-1, Sp has the same selection range as defined in formula I, but in the actual selection process, Sp in the first polymerizable compound shown in formula II-1 can be selected as a group that is the same as or different from that in formula I; in addition, in the first polymerizable compound shown in formula II-1, at least one Sp is a polymerizable group.

[0140] In some embodiments, the first polymerizable compound is selected from any one of the following compounds:

[0141]

[0142] It should be noted that an alkenyl group is formed between two benzene rings in the first polymerizable compound, and the alkenyl group can destroy the electron cloud structure of the main chain benzene ring, thereby reducing the polymerization reaction activity and slowing down the reaction rate under ultraviolet light (for example, light wavelength λ=313nm), thereby reducing the angular velocity of the liquid crystal composition during the alignment process and improving the uniformity of light illumination.

[0143] In some embodiments, the polymerizable compound further comprises a second polymerizable compound, and the chemical structural formula of the second polymerizable compound is as shown in Formula II-2;

[0144]

[0145] It can be understood that in the second polymerizable compound shown in formula II-2, Sp has the same selection range as defined in formula I, but in the actual selection process, Sp in the second polymerizable compound shown in formula II-2 can be selected as a group that is the same as or different from that in formula I; R2, R3, R4, R5, e and f in formula II-2 have the same selection range as defined in formula II-1.

[0146] In some embodiments, the second polymerizable compound is selected from any one of the following compounds:

[0147]

[0148] It should be noted that the second polymerizable compound shown in formula II-2 is a conventional polymerizable compound, which has a greater polymerization reaction activity under ultraviolet light and a faster reaction rate. In the embodiment of the present application, the first polymerizable compound and the second polymerizable compound can be added to the liquid crystal composition at the same time, wherein the reaction rate of the first polymerizable compound is slower, while the reaction rate of the second polymerizable compound is faster. Furthermore, the ratio of the first polymerizable compound to the second polymerizable compound can be adjusted to adjust the angular rate of the liquid crystal composition during the alignment process to meet more alignment requirements.

[0149] In some embodiments, the polymerizable compound further comprises a third polymerizable compound, and the chemical structural formula of the third polymerizable compound is as shown in Formula II-3;

[0150]

[0151] In one embodiment of the present application, the third polymerizable compound is selected from any one of the following compounds:

[0152]

[0153]

[0154] It can be understood that in the third polymerizable compound shown in formula II-3, Sp has the same selection range as defined in formula I, but in the actual selection process, Sp in the third polymerizable compound shown in formula II-3 can be selected as a group that is the same as or different from that in formula I; R2, R3, R4, R5, e and f in formula II-3 have the same selection range as defined in formula II-1.

[0155] It should be noted that the third polymerizable compound shown in formula II-3 contains an -OH group structure, which can quench the free radicals generated by other components of the liquid crystal composition when exposed to ultraviolet light, thereby improving the stability of the material, and further improving the VHR (voltage holding ratio) of the liquid crystal composition and improving the reliability of the liquid crystal composition.

[0156] As above, at least one Sp in the self-aligned compounds represented by Formula II-1, Formula II-2 and Formula II-3 is selected from a polymerizable group, and the polymerizable group described in the above embodiments can be a group containing an unsaturated bond such as a carbon-carbon double bond or a carbon-carbon triple bond.

[0157] In some embodiments, the chemical structure of the liquid crystal compound is as shown in Formula III:

[0158]

[0159] Among them, R6 and R7 are selected from H, F, Cl, Br, CN, SCN, NCS, alkyl having 1-10 carbon atoms, alkoxy having 1-10 carbon atoms, alkenyl having 2-10 carbon atoms, alkenyloxy having 2-10 carbon atoms, alkynyl having 2-10 carbon atoms, and alkynyloxy having 2-10 carbon atoms.

[0160] Among them, the terminal groups of R6 and R7 are unsubstituted or substituted by CN or CF3, one or more -CH2- in the R6 and R7 groups are unsubstituted or replaced by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C- and the heteroatom is not directly bonded, and one or more H in R6 and R7 are unsubstituted or substituted by one of F, Cl, Br, I.

[0161] In some embodiments, the mass percentage of the self-aligned compound in the liquid crystal composition ranges from 0.01% to 1.50%. For example, the mass percentage of the self-aligned compound in the liquid crystal composition can be 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1%, 1.05%, 1.1%, 1.15%, 1.2%, 1.25%, 1.3%, 1.35%, 1.4%, 1.45% or 1.5%.

[0162] In some embodiments, the mass percentage of the polymerizable compound in the liquid crystal composition ranges from 0.01% to 1.50%. For example, the mass percentage of the polymerizable compound in the liquid crystal composition can be 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1%, 1.05%, 1.1%, 1.15%, 1.2%, 1.25%, 1.3%, 1.35%, 1.4%, 1.45% or 1.5%.

[0163] In some embodiments, the mass percentage of the first polymerizable compound in the liquid crystal composition is in the range of 0 to 1.2%. For example, the mass percentage of the first polymerizable compound in the liquid crystal composition may be 0, 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%. , 0.8%, 0.85%, 0.9%, 0.95%, 1%, 1.05%, 1.1%, 1.15% or 1.2%; the mass percentage of the second polymerizable compound in the liquid crystal composition is in a range of 0.01% to 1.50%, for example, the mass percentage of the second polymerizable compound in the liquid crystal composition can be 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0 .4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1%, 1.05%, 1.1%, 1.15%, 1.2%, 1.25%, 1.3%, 1.35%, 1.4%, 1.45% or 1.5%; the mass proportion of the third polymerizable compound in the liquid crystal composition is in the range of 0 to 1.2%, for example, the mass proportion of the third polymerizable compound in the liquid crystal composition is 0 to 1.2%. The mass percentage of the three polymerizable compounds in the liquid crystal composition can be 0, 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1%, 1.05%, 1.1%, 1.15% or 1.2%.

[0164] In some embodiments, the mass percentage of the liquid crystal compound represented by Formula III in the liquid crystal composition ranges from 5% to 70%. For example, the mass percentage of the liquid crystal compound represented by Formula III in the liquid crystal composition may be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65% or 70%.

[0165] In some embodiments, the liquid crystal composition may further include functional monomers, such as some polar monomers, etc. The functional monomers may include at least one of the compounds shown in the following formula IV, formula V and formula VI:

[0166]

[0167] in, as well as Selected from Any non-adjacent -CH2- in is unsubstituted or substituted with -O-;

[0168] Selected from Any non-adjacent -CH2- in is unsubstituted or substituted with -O-;

[0169] Z6 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, an alkylene group having 1-10 carbon atoms, an alkenylene group having 2-10 carbon atoms, and an alkynyl group having 2-10 carbon atoms, and any non-adjacent -CH2- in Z6 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-, and one or more H in Z6 is unsubstituted or substituted by one of F, Cl, Br, and I.

[0170] R 11 , R 12 , R 13 , R 14 , R 15 and R 16 is selected from H, F, Cl, Br, CN, SCN, NCS, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, and an alkynyloxy group having 2 to 10 carbon atoms; wherein R 11 , R 12 , R 13 , R 14 , R 15 and R 16 The terminal group is unsubstituted or substituted by CN or CF3, R 11 , R 12 , R 13 , R 14 , R 15 and R 16 One or more -CH2- in the molecule is unsubstituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C- and the heteroatom is not directly bonded, R 11 , R 12 , R 13 , R14 , R 15 and R 16 One or more H in is unsubstituted or substituted by one of F, Cl, Br, and I.

[0171] In some embodiments, the mass proportion of the compound represented by Formula IV in the liquid crystal composition ranges from 1% to 30%, for example, the mass proportion of the compound represented by Formula IV in the liquid crystal composition may be 1%, 5%, 10%, 15%, 20%, 25% or 30%; the mass proportion of the compound represented by Formula V in the liquid crystal composition ranges from 1% to 30%, for example, the mass proportion of the compound represented by Formula V in the liquid crystal composition may be 1%, 5%, 10%, 15%, 20%, 25% or 30%; the mass proportion of the compound represented by Formula VI in the liquid crystal composition ranges from 1% to 40%, for example, the mass proportion of the compound represented by Formula VI in the liquid crystal composition may be 1%, 5%, 10%, 15%, 20%, 25%, 30% or 40%.

[0172] In some embodiments, the liquid crystal material in the liquid crystal composition provided in the embodiments of the present application has negative dielectric anisotropy and can be applied to liquid crystal displays in modes such as vertical alignment (VA), polymer sustained alignment (PSA), polymer stabilized vertical alignment (PS-VA), patterned vertical alignment (PVA) or multi-domain vertical alignment (MVA).

[0173] In some embodiments, the self-aligning compound comprises:

[0174]

[0175] In addition, the embodiments of the present application also provide a preparation process of the self-aligned compound.

[0176] Specifically, the self-aligning compound The synthesis process is:

[0177]

[0178]

[0179] Wherein R1 is pentyl (C5H 11 ), and the prepared product was subjected to high-resolution mass spectrometry test, [M+H]+ :913.6, confirmed as the target product.

[0180] Self-aligning compounds The synthesis process is:

[0181]

[0182]

[0183] Wherein R1 is pentyl (C5H 11 ), and the prepared product was subjected to high-resolution mass spectrometry test, [M+H] + :761.4, confirmed as the target product.

[0184] Self-aligning compounds The synthesis process is:

[0185]

[0186]

[0187] Wherein R1 is pentyl (C5H 11 ), and the prepared product was subjected to high-resolution mass spectrometry test, [M+H] + :683.4, confirmed as the target product.

[0188] As mentioned above, the liquid crystal composition provided in the embodiment of the present application includes the self-alignment compound represented by Formula I. When the liquid crystal composition is arranged between two substrates, the self-alignment compound and the polymerizable compound can undergo a polymerization reaction under ultraviolet light to form a polymer layer on the surface of the substrate; at the same time, the rigid chain group in the self-alignment compound acts as a steric obstacle perpendicular to the substrate surface, thereby guiding the liquid crystal molecules to align perpendicularly to the substrate to achieve a self-alignment function, thereby reducing the preparation of the PI alignment layer, reducing the process technology of the display panel, and reducing the cost; in addition, the embodiment of the present application can effectively reduce the angular velocity of the liquid crystal composition during the alignment process and improve the uniformity of light illumination by adding the first polymerizable compound represented by Formula II-1 to the liquid crystal composition, and the third polymerizable compound represented by Formula II-3 can effectively improve the stability of the material, thereby improving the VHR (voltage holding ratio) of the liquid crystal composition and improving the reliability of the liquid crystal composition.

[0189] In addition, the present application also provides a display panel, please refer to Figure 1 The display panel includes a first substrate 11 , a second substrate 12 , a liquid crystal layer 13 and an alignment layer 14 .

[0190] The first substrate 11 and the second substrate 12 are arranged opposite to each other, the liquid crystal layer 13 is located between the first substrate 11 and the second substrate 12 , and the alignment layer 14 is at least arranged on one side of the first substrate 11 close to the liquid crystal layer 13 .

[0191] In the embodiment of the present application, the alignment layer 14 is formed by polymerizing the self-alignment compound and the polymerizable compound in the liquid crystal composition described in the above embodiment.

[0192] In some embodiments, the alignment layer 14 includes a first alignment layer 141 disposed on a side of the first substrate 11 close to the liquid crystal layer 13 and a second alignment layer 142 disposed on a side of the second substrate 12 close to the liquid crystal layer 13 .

[0193] In some embodiments, the liquid crystal layer 13 is formed by the liquid crystal compound in the above liquid crystal composition, and the alignment layer 14 is formed by polymerizing the self-alignment compound and the polymerizable compound in the above liquid crystal composition.

[0194] In some embodiments, the display panel may be in any of VA, PSA, PS-VA, PVA or MVA modes.

[0195] In some embodiments, the first substrate 11 is an opposing substrate (or a color filter substrate), and the second substrate 12 is an array substrate.

[0196] Specifically, the display panel also includes an electrode group formed on one or both of the first substrate 11 and the second substrate 12 , a plurality of active elements (such as thin film transistors) located in the second substrate 12 , and a color filter layer located on the first substrate 11 or the second substrate 12 .

[0197] In a specific embodiment, the electrode group includes pixel electrodes located on the second substrate 12 and common electrodes located on the first substrate 11 and / or the second substrate 12 .

[0198] In a specific embodiment, the color film layer includes red (R) color resist, green (G) color resist and blue (B) color resist distributed in an array; wherein the red color resist contains diketopyrrolopyrrole or other organic pigment compounds, the proportion of water-soluble pigments contained in the red color resist is not higher than 1.5%, and 90% of the pigment particles have a particle size range of 0-100nm.

[0199] For example, the particle size of the pigment particles in the red color resist may be 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm or 100 nm, but is not limited thereto.

[0200] It can be understood that the smaller the particle size of the pigment particles in the red color resist, the more conducive it is to uniform distribution of the pigment, thereby helping to improve the product's penetration, reliability and color gamut.

[0201] The liquid crystal composition provided in the embodiment of the present application includes the self-alignment compound represented by formula I. When the liquid crystal composition is arranged between two substrates, the self-alignment compound and the polymerizable compound can undergo a polymerization reaction under ultraviolet light, thereby forming a polymer layer on the surface of the substrate; at the same time, the rigid chain group in the self-alignment compound acts as a steric obstacle perpendicular to the substrate surface, thereby guiding the liquid crystal molecules to align perpendicularly to the substrate, realizing the self-alignment function, thereby reducing the preparation of the PI alignment layer, reducing the process technology of the display panel, and reducing the cost; in addition, the embodiment of the present application can effectively reduce the angular rate of the liquid crystal composition during the alignment process and improve the uniformity of light illumination by adding the first polymerizable compound represented by formula II-1 to the liquid crystal composition, and the third polymerizable compound represented by formula II-3 can effectively improve the stability of the material, thereby improving the VHR (voltage holding ratio) of the liquid crystal composition and improving the reliability of the liquid crystal composition.

[0202] Furthermore, the embodiments of the present application provide embodiments 1 to 3, and comparative examples 1 and 2 to verify the performance of the liquid crystal composition provided in the embodiments of the present application.

[0203] In Examples 1 to 3, and Comparative Examples 1 and 2, the preparation process of the liquid crystal composition includes:

[0204] 1. Weigh the liquid crystal material by mass percentage using a balance, wherein there is no specific requirement for the order of weighing and adding. In some embodiments, the components in the liquid crystal material are weighed and mixed at once in the order of melting points from low to high, wherein the liquid crystal material may include a liquid crystal compound and a functional monomer;

[0205] 2. Heat and stir at 60℃-100℃ to fully dissolve and mix the components in the liquid crystal material;

[0206] 3. Heat and stir at 60° C.-100° C., add the self-aligning additive represented by formula I and the polymerizable compound represented by formula II into the above liquid crystal material according to a certain mass percentage, and make the mixture uniform;

[0207] 4. Cool to room temperature and encapsulate to obtain the target sample.

[0208] Specifically, as shown in Table 1 below, the components and proportions of the liquid crystal composition provided in Example 1 are shown.

[0209] Table 1 Component distribution and performance parameters of the liquid crystal composition of Example 1

[0210]

[0211] Among them, the first compound to the eleventh compound are liquid crystal materials, and the sum of the mass percentages of the first compound to the eleventh compound in the liquid crystal material is 100%; the twelfth compound is the second polymerizable compound, the thirteenth compound is the first polymerizable compound, the fourteenth compound is the third polymerizable compound, and the fifteenth compound is a self-aligned compound.

[0212] Furthermore, the liquid crystal material is mixed with a mass percentage of 99.1%, the mass percentage of the twelfth compound is 0.16%, the mass percentage of the thirteenth compound is 0.02%, the mass percentage of the fourteenth compound is 0.12%, and the mass percentage of the fifteenth compound is 0.6% to obtain the liquid crystal composition provided in Example 1.

[0213] As shown in Table 2 below, the components and proportions of the liquid crystal composition provided in Example 2 are shown.

[0214] Table 2 Component distribution and performance parameters of the liquid crystal composition of Example 2

[0215]

[0216] Among them, the first compound to the twelfth compound are liquid crystal materials, and the sum of the mass percentages of the first compound to the twelfth compound in the liquid crystal material is 100%; the thirteenth compound is the second polymerizable compound, the fourteenth compound is the first polymerizable compound, the fifteenth compound is the third polymerizable compound, and the sixteenth compound is a self-aligned compound.

[0217] Furthermore, the liquid crystal material is mixed with a mass percentage of 99.1%, the mass percentage of the thirteenth compound is 0.16%, the mass percentage of the fourteenth compound is 0.02%, the mass percentage of the fifteenth compound is 0.12%, and the mass percentage of the sixteenth compound is 0.6% to obtain the liquid crystal composition provided in Example 2.

[0218] As shown in Table 3 below, the components and proportions of the liquid crystal composition provided in Example 3 are shown.

[0219] Table 3 Component distribution and performance parameters of the liquid crystal composition of Example 3

[0220]

[0221] Among them, the first compound to the twelfth compound are liquid crystal materials, and the sum of the mass percentages of the first compound to the twelfth compound in the liquid crystal material is 100%; the thirteenth compound is the second polymerizable compound, the fourteenth compound is the first polymerizable compound, the fifteenth compound is the third polymerizable compound, and the sixteenth compound and the seventeenth compound are self-aligned compounds.

[0222] Furthermore, the mass percentage of the liquid crystal material is 98.9%, the mass percentage of the thirteenth compound is 0.16%, the mass percentage of the fourteenth compound is 0.02%, the mass percentage of the fifteenth compound is 0.12%, the mass percentage of the sixteenth compound is 0.4%, and the mass percentage of the seventeenth compound is 0.4% to obtain the liquid crystal composition provided in Example 3.

[0223] As shown in Table 4 below, the components and proportions of the liquid crystal composition provided in Comparative Example 1 are shown.

[0224] Table 4 Component distribution and performance parameters of the liquid crystal composition of Comparative Example 1

[0225]

[0226] Among them, the first compound to the eleventh compound are liquid crystal materials, and the sum of the mass percentages of the first compound to the eleventh compound in the liquid crystal material is 100%; the twelfth compound is a second polymerizable compound, and the thirteenth compound is a self-aligned compound.

[0227] Furthermore, the liquid crystal composition provided in Comparative Example 1 is obtained by mixing the liquid crystal material with a mass percentage of 99.1%, the twelfth compound with a mass percentage of 0.3%, and the thirteenth compound with a mass percentage of 0.6%.

[0228] As shown in Table 5 below, the components and proportions of the liquid crystal composition provided in Comparative Example 2 are shown.

[0229] Table 5 Component distribution and performance parameters of the liquid crystal composition of Comparative Example 2

[0230]

[0231] The first compound to the eleventh compound are liquid crystal materials, and the sum of the mass percentages of the first compound to the eleventh compound in the liquid crystal material is 100%; the twelfth compound is a second polymerizable compound.

[0232] Furthermore, the liquid crystal material is mixed with a mass percentage of 99.7% and the mass percentage of the twelfth compound is mixed with a mass percentage of 0.3% to obtain the liquid crystal composition provided in Comparative Example 2.

[0233] It should be noted that in Tables 1 to 5 above, the temperature unit is °C; Tni represents the clearing point of the liquid crystal composition (unit: °C); Δn represents the optical anisotropy at 25 °C, n e is the refractive index of extraordinary light; γ1 represents the rotational viscosity at 25°C (unit: mPa·s); Δε represents the dielectric anisotropy at 25°C, ε ⊥ is the dielectric constant perpendicular to the long axis of the liquid crystal molecules.

[0234] It can be seen from Tables 1 to 5 above that the liquid crystal composition provided in Comparative Example 2 does not contain a self-alignment compound, and thus a PI alignment film manufacturing process is required. However, Examples 1 to 3 and Comparative Example 1 all contain a self-alignment compound, and thus a PI alignment film does not need to be set up. The alignment layer can be formed by polymerization reaction of the self-alignment compound and the polymerizable compound. Therefore, the liquid crystal composition provided in the embodiments of the present application can reduce the PI alignment film manufacturing process and reduce production costs by adding the self-alignment compound.

[0235] Furthermore, the embodiments of the present application verify the angle rate and voltage holding ratio of the liquid crystal compositions in Embodiments 1 to 3 and Comparative Example 1 to obtain the following Tables 6 and 7.

[0236] Table 6

[0237] Angular rate Example 1 Example 2 Example 3 Comparative Example 1 UV1 irradiation time (1°) 58s 59s 56s 42s

[0238] Table 7

[0239] Example 1 Example 2 Example 3 Comparative Example 1 VHR (voltage holding ratio) 92％ 90％ 91％ 84％

[0240] Among them, Table 6 shows the illumination time required to form a pretilt angle of 1°. Examples 1 to 3 all contain the first polymerizable compound, while Comparative Example 1 does not contain the first polymerizable compound. It can be seen from Table 6 that the time required for angle formation in Examples 1 to 3 is greater than that in Comparative Example 1, and further, the angle formation rate in Examples 1 to 3 is less than that in Comparative Example 1, which indicates that the embodiments of the present application can effectively reduce the angle formation rate of the liquid crystal composition during the alignment process by adding the first polymerizable compound to the liquid crystal composition. In addition, Examples 1 to 3 all contain the third polymerizable compound, while Comparative Example 1 does not contain the third polymerizable compound. It can be seen from Table 7 that the voltage holding ratios of Examples 1 to 3 are greater than that of Comparative Example 1, which indicates that the embodiments of the present application can effectively improve the VHR (voltage holding ratio) of the liquid crystal composition by adding the third polymerizable compound to the liquid crystal composition.

[0241] In summary, the liquid crystal composition provided in the embodiment of the present application includes the self-alignment compound represented by Formula I. When the liquid crystal composition is arranged between two substrates, the self-alignment compound and the polymerizable compound can undergo a polymerization reaction under ultraviolet light, thereby forming a polymer layer on the surface of the substrate; at the same time, the rigid chain group in the self-alignment compound acts as a steric obstacle perpendicular to the substrate surface, thereby guiding the liquid crystal molecules to align perpendicularly to the substrate, realizing the self-alignment function, thereby reducing the preparation of the PI alignment layer, reducing the process technology of the display panel, and reducing the cost; in addition, the embodiment of the present application can effectively reduce the angular rate of the liquid crystal composition during the alignment process and improve the uniformity of light illumination by adding the first polymerizable compound represented by Formula II-1 to the liquid crystal composition, and the third polymerizable compound represented by Formula II-3 can improve the VHR (voltage holding ratio) of the liquid crystal composition, thereby effectively improving the reliability of the liquid crystal composition.

[0242] In addition, an embodiment of the present application further provides a display device, which includes the display panel described in the above embodiment.

[0243] In some embodiments, the display device further includes a backlight module, and the display panel is disposed on a light emitting side of the backlight module.

[0244] It can be understood that, since the display device includes the display panel described in the above embodiment, the display device has the same beneficial effects as the display panel described in the above embodiment, which will not be described in detail herein.

[0245] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0246] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0247] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0248] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A liquid crystal composition, characterized in that: The liquid crystal composition comprises a liquid crystal compound, a self-alignment compound and a polymerizable compound, wherein the polymerizable compound comprises a first polymerizable compound, the chemical structural formula of the self-alignment compound is shown in Formula I, and the chemical structural formula of the first polymerizable compound is shown in Formula II-1; Wherein, R1 is selected from H, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, and an aromatic group having 3 to 10 carbon atoms; any one or multiple non-adjacent -CH2- in R1 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-; one or more H in R1 is unsubstituted or substituted by one of F, Cl, Br, and I; Z1, Z2 and Z3 are selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, an alkylene group having 1 to 10 carbon atoms, an alkenylene group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, any non-adjacent -CH2- in Z1, Z2 and Z3 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in Z1, Z2 and Z3 is unsubstituted or substituted by one of F, Cl, Br, I; X is selected from a single bond, -O-, -S-, -CO-, -CH2- or -CF2-; L is selected from H, F, Cl, CF3, Sp, an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, an alkenyloxy group having 2-10 carbon atoms, an alkynyl group having 2-10 carbon atoms, an alkynyloxy group having 2-10 carbon atoms, a cycloalkyl group having 3-10 carbon atoms, an aromatic group having 3-10 carbon atoms, any one or multiple non-adjacent -CH2- in L is unsubstituted or substituted by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in L is unsubstituted or substituted by one of F, Cl, Br, and I; Selected from in Any non-adjacent -CH2- in is unsubstituted or substituted with -O-; Sp is selected from an ether group, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group or a polymerizable group, and at least one Sp is selected from a polymerizable group; T is selected from a group containing a hydroxyl group; The H on the benzene ring in the self-aligning compound is unsubstituted or substituted by F, Cl, Br, CN, SCN, NCS, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or an alkynyloxy group having 2 to 10 carbon atoms; R2, R3, R4 and R5 are selected from H, F, CF3, alkyl having 1-5 carbon atoms, alkoxy having 1-5 carbon atoms, alkenyl having 2-5 carbon atoms, alkenyloxy having 2-5 carbon atoms, and one or more H in R2, R3, R4 and R5 is unsubstituted or substituted by one of F, Cl, Br, I; n is selected from 1, 2 or 3; a, b, c and d are selected from 0, 1, 2 or 3, and the sum of a and b is greater than or equal to 1; p and q are selected from 0, 1 or 2; e and f are selected from 0, 1 or 2, and the sum of e and f is greater than or equal to 1.

2. The liquid crystal composition according to claim 1, characterized in that: T is selected from the structure shown in formula (1): Among them, R8, R9 and R 10 is selected from H, OH, F, Cl, Br, CN, SCN, NCS, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, R8, R9 and R 10 The terminal group is unsubstituted or substituted by one of OH, CN, CF3, R8, R9 and R 10 One or more -CH2- in is unsubstituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C- and the heteroatom is not directly bonded, R8, R9 and R 10 One or more H in is unsubstituted or substituted by one of F, Cl, Br, and I; R8, R9 and R 10 At least one of the groups has a hydroxyl terminal group; Z4 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, an alkylene group having 1 to 10 carbon atoms, an alkenylene group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, any non-adjacent -CH2- in Z4 is unsubstituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in Z4 is unsubstituted or substituted by one of F, Cl, Br, and I; k is selected from any integer between 0 and 10.

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

4. The liquid crystal composition according to claim 1, characterized in that: The self-aligning compound is selected from any one of the compounds represented by the following formula I-1 to formula I-20: Wherein, a and b are selected from 0, 1 or 2, and the sum of a and b is greater than or equal to 1; n is selected from 1 or 2; Sp is selected from an ether group, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group or a polymerizable group, and at least one Sp in each of Formulas I-1 to I-20 is selected from a polymerizable group; T is selected from a group containing a hydroxyl group.

5. The liquid crystal composition according to claim 4, characterized in that: The self-aligning compound is selected from any one of the compounds represented by the following formula I-1-1 to formula I-20-4:

6. The liquid crystal composition according to claim 1, characterized in that: The first polymerizable compound is selected from any one of the following compounds:

7. The liquid crystal composition according to claim 1 or 3, characterized in that: The polymerizable compound further includes a second polymerizable compound, and the chemical structural formula of the second polymerizable compound is shown in Formula II-2; 8. The liquid crystal composition according to claim 7, characterized in that: The second polymerizable compound is selected from any one of the following compounds:

9. The liquid crystal composition according to claim 1 or 3, characterized in that: The polymerizable compound further includes a third polymerizable compound, and the chemical structural formula of the third polymerizable compound is shown in Formula II-3; 10. The liquid crystal composition according to claim 9, characterized in that: The third polymerizable compound is selected from any one of the following compounds:

11. A display panel, characterized in that: include: a first substrate; a second substrate, arranged opposite to the first substrate; a liquid crystal layer, disposed between the first substrate and the second substrate; An alignment layer is at least arranged on a side of the first substrate close to the liquid crystal layer, and the alignment layer is formed by polymerizing the self-alignment compound and the polymerizable compound in the liquid crystal composition according to any one of claims 1 to 10.

Images