Alignment film composition and display panel

Abstract

To provide an alignment film composition that can improve the hardness of a first alignment layer and an anchoring force of the first alignment layer to a liquid crystal effectively, thus remedying the phenomenon of light leakage in the display panel.SOLUTION: A display panel 1 includes a first substrate 11, a second substrate 12, and a first alignment layer 21. The first substrate is disposed opposite to the second substrate. The first alignment layer is disposed on a side of the first substrate closer to the second substrate, and the first alignment layer has a first polyimide molecular chain, and the first polyimide molecular chain comprises a unit represented below, wherein A is a group comprising at least one of a phenoxy group or a biphenyl group, n is an integer greater than or equal to 1, and m is an integer greater than or equal to 1.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to an alignment film composition and a display panel.

Background Art

[0002] A conventional liquid crystal display panel includes an array substrate and a color filter substrate that are disposed opposite to each other, and a liquid crystal layer located between the array substrate and the color filter substrate. The array substrate provides a switch signal and a data signal, the color filter substrate provides colorization, and the orientation of liquid crystal molecules in the liquid crystal layer controls the display brightness.

[0003] A conventional liquid crystal display panel provides an initial alignment direction for liquid crystal molecules by forming an alignment film on the array substrate and the color filter substrate. However, a PS (isolation pillar) located between the array substrate and the color filter substrate in the liquid crystal display panel moves, and rubbing occurs between the PS and the alignment film, which may damage the alignment film and generate chips. In the region where the alignment film is damaged, the alignment control force is insufficient, the bright spots are broken, and light leakage occurs from the liquid crystal display panel in the dark state.

Summary of the Invention

[0004] This application provides an alignment film composition and a display panel that can effectively improve the hardness of the first alignment layer and the alignment control force for liquid crystal, and improve the light leakage phenomenon of the display panel.

[0005] An embodiment of this application provides a display panel, which includes a first substrate, a second substrate disposed opposite to the first substrate, a first alignment layer disposed on the side of the first substrate close to the second substrate and having a first polyimide molecular chain including units represented by Chemical Formula 1 below.

Chemical Formula

[0006] In one embodiment of the present invention, the first polyimide molecular chain includes the unit shown in the following chemical formula 2, [ka] Here, R1 is selected from diamine subunits having 1 to 50 carbon atoms, and R2 is selected from dianhydride subunits having 8 to 14 carbon atoms.

[0007] In one embodiment of the present invention, the first polyimide molecular chain includes the unit shown in the following chemical formula 3, [ka] Here, X is selected from substituted or unsubstituted aliphatic groups having 1 to 50 carbon atoms or substituted or unsubstituted aromatic groups having 1 to 50 carbon atoms, Y is selected from substituted or unsubstituted cycloalkyl groups having 4 to 10 carbon atoms, and R is selected from hydrogen atoms or substituted or unsubstituted alkyl groups having 1 to 5 carbon atoms.

[0008] In one embodiment of the present invention, the display panel further includes a second orientation layer located on the side of the second substrate closer to the first substrate, the second orientation layer having a second polyimide molecular chain, the second polyimide molecular chain containing the unit shown in Chemical Formula 1.

[0009] In one embodiment of the present invention, A in the first polyimide molecular chain and A in the second polyimide molecular chain are independently selected from at least one of a group having a phenoxy group and a group having a biphenyl group.

[0010] In one embodiment of the present application, the unit shown in Chemical Formula 1 is the unit shown in Chemical Formula 4 below. [ka] Selected from.

[0011] In one embodiment of the present invention, the display panel further includes a liquid crystal layer placed between the first alignment layer and the second alignment layer, wherein the liquid crystal layer includes liquid crystal molecules, and the liquid crystal molecules include at least one of a phenoxy group and a biphenyl group.

[0012] In accordance with the above objective of the present application, the embodiments of the present application further provide an alignment film composition comprising a diamine monomer, a dianhydride monomer, and an additive, wherein the additive has the structure shown in the following chemical formula 5. [ka] Here, A contains at least one of a phenoxy group and a biphenyl group, and p1, p2, q1, and q2 are all integers of 1 or greater.

[0013] In one embodiment of the present application, the mass ratio of the additive in the liquid crystal composition is 0.1% or more and 20% or less.

[0014] In one embodiment of the present application, the additive is a compound represented by the following formula 6. [ka] Selected from.

[0015] In accordance with the above-mentioned objectives of the present application, embodiments of the present application further provide a display device comprising the display panel and a backlight module.

[0016] The beneficial effects of the present application are as follows. By forming the structure shown in Chemical Formula 1 in the first polyimide molecular chain of the first alignment layer, the crosslinking degree of the first alignment layer can be improved, the hardness of the first alignment layer can be improved, and the probability of the first alignment layer being damaged can be reduced. On the other hand, the structure shown in Chemical Formula 1 has at least one of a phenoxy group and a biphenyl group. Both the phenoxy group and the biphenyl group are liquid crystal-like structures, which can effectively improve the alignment control force of the first alignment layer with respect to the liquid crystal, and further improve the light leakage phenomenon of the display panel.

Brief Description of Drawings

[0017] [Figure 1] It is a schematic structural diagram of a display panel according to an embodiment of the present application. [Figure 2] It is a schematic structural diagram of a polyimide molecular chain according to an embodiment of the present application. [Figure 3] It is a nuclear magnetic spectrum of compound M1 according to an embodiment of the present application. [Figure 4] It is a nuclear magnetic spectrum of compound M2 according to an embodiment of the present application. [Figure 5] It is a nuclear magnetic spectrum of compound M3 according to an embodiment of the present application. [Figure 6] It is a nuclear magnetic spectrum of compound Z1 according to an embodiment of the present application. [Figure 7] It is a schematic structural diagram of a pixel electrode according to an embodiment of the present application. [Figure 8] It is a schematic structural diagram of a display device according to an embodiment of the present application.

Modes for Carrying Out the Invention

[0018] Hereinafter, the technical solutions in the embodiments of the present application will be described in conjunction with the drawings in the embodiments of the present application.

[0019] It should be understood that the specific embodiments described herein are only for explaining and interpreting the present application, and are not intended to limit the present application.

[0020] In this application, unless otherwise specified, the directional terms used, such as "up" and "down," generally refer to the up and down in the actual use or operating state of the device, specifically the drawing direction in the figures, while "inside" and "outside" refer to the orientation relative to the outline of the device. In this application, "selectively," "selective," and "selectable" are optional, meaning that one can be selected from either one of two parallel solutions, "yes" or "no," and where multiple "selectable" options appear in a single technical solution, each "selectable" option is independent unless otherwise specified and there is no contradiction or interphasizing relationship. In this application, technical features described in an open format include closed technical solutions consisting of the listed features, and also include open technical solutions containing the listed features.

[0021] In this application, aromatic group, aromatic, and aromatic ring system have the same meaning and are interchangeable. "Aryl group or aromatic group or aromatic ring system" means an aromatic hydrocarbon group obtained by removing one hydrogen atom from an aromatic ring compound, and may be a monocyclic aryl group, a fused ring aryl group, or a polycyclic aryl group, and at least one of the rings in the polycyclic group is an aromatic ring system. For example, "substituted or unsubstituted aryl group having 6 to 40 ring atoms" means 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 may be optionally further substituted. Preferred examples include, but are not limited to, phenyl, biphenyl, terphenyl, naphthyl, anthracenyl, phenantrenyl, fluoranthenyl, triphenylene, pyrenyl, perilenyl, tetraphenyl, fluorenyl, perilene, acenaphthylene, and their derivatives. It is understandable that multiple aryl groups may be interrupted by short non-aromatic units (e.g., <10% of non-H atoms such as C, N, or O atoms), and in particular, acenaphthylene, fluorene, or 9,9-diarylfluorene, triarylamines, and diaryl ether systems should also be included in the definition of an aryl group.

[0022] In this application, heteroaromatic group, heteroaromatic, and heteroaromatic ring system have the same meaning and are interchangeable. "Heteroaryl or heteroaromatic group or heteroaromatic ring system" means that under an aryl group, at least one carbon atom is substituted by a non-carbon atom which may be an N atom, O atom, S atom, etc. For example, "substituted or unsubstituted heteroaryl having 5 to 40 ring atoms" means a heteroaryl having 5 to 40 ring atoms, preferably a substituted or unsubstituted heteroaryl having 6 to 30 ring atoms, more preferably a substituted or unsubstituted heteroaryl having 6 to 18 ring atoms, and particularly preferably a substituted or unsubstituted heteroaryl having 6 to 14 ring atoms, where the heteroaryl is optionally further substituted, and preferred examples include, but are not limited to: thienyl, furanyl, pyrrolyl, diazolyl, triazolyl, imidazolyl, pyridyl, bipyridyl, pi Limidinyl, triazinyl, acridinyl, pyridadinyl, pyrazinyl, quinolinyl, isoquinolinyl, quinazolinyl, quinoxalinyl, phthalazinyl, pyridopyrimidinyl, pyridopyrazine, benzothienyl, benzofladinyl, indolyl, pyrroloimidazolyl, pyrrolopyrrolyl, thienopyrrolyl, thienotienyl, flopyrrolyl, flofuryl, thienofuryl, benzoisoxazolyl, benzoisothiazolyl, benzimidazolyl, benzonaphthyl, phenantridinyl, primary lydinyl, quinazolinone, dibenzothienyl, dibenzofuranyl, carbazolyl group and its derivatives.

[0023] In this application, "substitution" means that one or more hydrogen atoms in a substituent are substituted by the substituent. If the same substituent appears multiple times, it may be independently selected from different groups. If the generalization contains multiple R groups, R may be independently selected from different groups. In the embodiments of this application, "substituted or unsubstituted" means that the defined group may or may not be substituted, and if the defined group is substituted, it should be understood that the defined group may be substituted with one or more substituents R, the substituents R being selected from, but not limited to, a deuterium atom, a cyano group, an isocyano group, a nitro group or halogen, an alkyl group with 1 to 20 carbon atoms, a heterocyclyl group with 3 to 20 ring atoms, an aromatic group with 6 to 20 ring atoms, a heteroaromatic group with 5 to 20 ring atoms, -NR'R'', a silyl group, a carbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, a haloformyl group, a formyl group, an isocyanate group, a thiocyanate group, an isothiocyanate group, a hydroxyl group, and a trifluoromethyl group, and the above groups may be further substituted with substituents acceptable in the art. Here, in -NR'R'', R' and R'' are independently selected from, but are not limited to, H, a deuterium atom, a cyano group, an isocyano group, a nitro group or halogen group, an alkyl group with 1 to 10 carbon atoms, a heterocyclyl group with 3 to 20 ring atoms, an aromatic group with 6 to 20 ring atoms, and a heteroaromatic group with 5 to 20 ring atoms. Preferably, R is selected from, but is not limited to, a deuterium atom, a cyano group, an isocyano group, a nitro group or halogen group, an alkyl group containing 1 to 10 carbon atoms, a heterocyclyl group having 3 to 10 ring atoms, an aromatic group having 6 to 20 ring atoms, a heteroaromatic group having 5 to 20 ring atoms, a silyl group, a carbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, a haloformyl group, a formyl group, an isocyanate group, a thiocyanate group, an isothiocyanate group, a hydroxyl group, and a trifluoromethyl group, and the above groups may be further substituted with substituents acceptable in the art.

[0024] In this application, "amine group" refers to a derivative of an amine, having the structural characteristics of -NR'R'', and the meanings of R' and R'' are the same as described above.

[0025] In this application, "ring atom number" refers to the number of atoms that constitute the ring itself in a structural compound in which atomic bonds are synthesized in a cyclic manner (e.g., monocyclic compounds, fused ring compounds, crosslinked compounds, carbocyclic compounds, heterocyclic compounds). If the ring is substituted with substituents, the atoms included in the substituents are not included in the ring-forming atoms. The same applies to the "ring atom number" described below unless otherwise specified. For example, the ring atom number of a benzene ring is 6, the ring atom number of a naphthalene ring is 10, and the ring atom number of a thienyl group is 5.

[0026] In this application, the asterisk (*) attached to a single bond indicates a bonding or condensation site.

[0027] In this application, if a connection site is not clearly specified in the base, any connectable site is indicated as a connection site in the base.

[0028] In this application, if condensation sites are not explicitly specified, it means that any condensable sites in the base are considered condensation sites, and preferably, two or more sites in the ortho position in the base are condensation sites.

[0029] In this application, when a group has multiple substituents with the same symbol, each substituent may be the same as or different from the others, for example. [ka] In this case, the six R atoms on the benzene ring may be the same or different from each other.

[0030] In this application, a single bond to which a substituent is linked penetrates the corresponding ring, meaning that the substituent can be linked at any position on the ring, for example. [ka] In this case, R can be linked to any substituted site on the benzene ring. For example, [ka] teeth [ka] but [ka] This means that it can form a parallel ring at any position on the benzene ring.

[0031] The terms cyclic alkyl or cycloalkyl as used in this application have the same meaning and are interchangeable.

[0032] In this application, "adjacent groups" means that there are no substitutable sites between the two substituents.

[0033] In this application, "two adjacent R1 or R3 or R5 form a ring with each other" means a ring system formed by the linkage of two adjacent R1 or R3 or R5 with each other, and the ring system can be selected from an aliphatic hydrocarbon ring, an aliphatic heterocycle, an aromatic hydrocarbon ring, or an aromatic heterocycle. Preferably, [ka] It is possible to form this.

[0034] Referring to Figure 1, an embodiment of the present application provides a display panel comprising a first substrate 11, a second substrate 12, and a first alignment layer 21.

[0035] Here, the first substrate 11 is installed facing the second substrate 12, and the first orientation layer 21 is installed on the side of the first substrate 11 closer to the second substrate 12.

[0036] Furthermore, the first orientation layer 21 has a first polyimide molecular chain, and the first polyimide molecular chain contains the units shown in the following chemical formula 13. [ka] Here, A contains at least one of a phenoxy group and a biphenyl group, n is an integer of 1 or more, and m is an integer of 1 or more.

[0037] In the implementation process, the embodiment of the present application improves the degree of crosslinking of the first orientation layer 21 by forming the structure shown in Chemical Formula 1 on the first polyimide molecular chain of the first orientation layer 21, thereby improving the hardness of the first orientation layer 21 and reducing the probability of scratching the first orientation layer 21. Furthermore, the structure shown in Chemical Formula 1 has at least one of a phenoxy group and a biphenyl group, and both the phenoxy group and the biphenyl group have a liquid crystal-like structure, which can effectively improve the orientation restricting force of the first orientation layer on the liquid crystal 21, and can further improve the light leakage phenomenon of the display panel.

[0038] It should be explained that the fact that A contains at least one of a phenoxy group and a biphenyl group means that the group represented by A contains at least one of a phenoxy group and a biphenyl group, and that the group represented by A may further contain other groups other than phenoxy and biphenyl groups, such as C, N, OH, etc.

[0039] Furthermore, referring to Figures 1 and 2, the first polyimide molecular chain further includes diamine subunits R1 and dianhydride subunits R2 formed by polymerization. The unit L shown in Chemical Formula 1 may be linked between the crosslinked diamine subunits R1 and dianhydride subunits R2, thereby crosslinking the first polyimide molecular chain into a network structure, further improving the degree of crosslinking of the first polyimide molecular chain, that is, improving the degree of crosslinking of the first oriented layer 21, thereby improving the hardness of the first oriented layer 21 and reducing the probability of scratching the first oriented layer 21.

[0040] In one embodiment, the diamine subunit R1 may be obtained by the reaction of a diamine monomer, and the diamine monomer may be p-phenylenediamine, m-phenylenediamine, 2,4-diaminotoluene, 2,5-diaminotoluene, 2,6-diaminotoluene, 2,4-dimethyl-1,3-diaminobenzene, 2,5-dimethyl-1,4-diaminobenzene, 2,3,5,6-tetramethyl-1,4-diaminobenzene, 2,4-diaminophenol, 2,5-diaminophenol, 4,6-diaminoresorcinol, 2,5-diaminobenzoic acid, 3 ,5-diaminobenzoic acid, N,N-diallyl-2,4-diaminoaniline, N,N-diallyl-2,5-diaminoaniline, 4-aminobenzylamine, 3-aminobenzylamine, 2-(4-aminophenyl)ethylamine, 2-(3-aminophenyl)ethylamine, 1,5-naphthalenediamine, 2,7-naphthalenediamine, 4,4'-diaminobiphenyl, 3,4'-diaminobiphenyl, 3,3'-diaminobiphenyl, 2,2'-dimethyl-4,4'-diaminobiphenyl, 3,3'-dimethyl-4,4'-diaminobiphenyl, 3, 3'-Dimethoxy-4,4'-diaminobiphenyl, 3,3'-Dicarboxy-4,4'-diaminobiphenyl, 3,3'-Dicarboxy-4,4'-diaminobiphenyl, 3,3'-Difluoro-4,4'-diaminobiphenyl, 2,2'-Trifluoromethyl-4,4'-diaminobiphenyl, 3,3'-Trifluoromethyl-4,4'-diaminobiphenyl, 4,4'-Diaminodiphenylmethane, 3,3'-Diaminodiphenylmethane, 3,4'-Diaminodiphenylmethane, 4,4'-Diaminodiphenyl ether, 3,3'-Diaminodi Phenyl ether, 3,4'-diaminodiphenyl ether, 4,4'-diaminodiphenyl sulfone, 3,3'-diaminodiphenyl sulfone, 4,4'-diaminodiphenylamine, 3,3'-diaminodiphenylamine, 3,4'-diaminodiphenylamine, N-methyl(4,4'-diaminodiphenyl)amine, N-methyl(3,3'-diaminodiphenyl)amine, N-methyl(3,4'-diaminodiphenyl)amine, 4,4'-diaminobenzophenone, 3,3'-diaminobenzophenone, 3,4'-diaminobenzophenone, 4,4'-Diamino-N-benzoanilide, 1,2-bis(4-aminophenyl)ethane, 1,2-bis(3-aminophenyl)ethane, 4,4'-Diaminodiphenylacetylene, 1,3-bis(4-aminophenyl)propane, 1,3-bis(3-aminophenyl)propane, 2,2-bis(4-aminophenyl)propane, 2,2-bis(3-aminophenyl)propane, 2,2-bis(3-amino-4-methylphenyl)propane, 2,2-bis(4-aminophenyl)hexafluoropropane, 2,2-bis(3-aminophenyl)hexafluoro Propane, 2,2-bis(3-amino-4-methylphenyl)hexafluoropropane, 1,3-bis(4-aminophenoxy)propane, 1,4-bis(4-aminophenoxy)butane, 1,5-bis(4-aminophenoxy)pentane, 1,6-bis(4-aminophenoxy)hexane, 1,7-bis(4-aminophenoxy)heptane, 1,8-bis(4-aminophenoxy)octane, 1,9-bis(4-aminophenoxy)nonane, 1,10-bis(4-aminophenoxy)decane, 1,11-bis(4-aminophenoxy)undecane, 1, 12-Bis(4-aminophenoxy)dodecane, bis(4-aminophenyl)malonate, bis(4-aminophenyl)succinate, bis(4-aminophenyl)glutarate, bis(4-aminophenyl)adipate, bis(4-aminophenyl)hemephosphate, bis(4-aminophenyl)octanedionate, bis(4-aminophenyl)azelaic acid, bis(4-aminophenyl)sebacate, 1,4-bis(4-aminophenyl)benzene, 1,3-bis(4-aminophenyl)ben Zen, 1,4-bis(4-aminophenoxy)benzene, 1,3-bis(4-aminophenoxy)benzene, 1,4-bis(4-aminobenzyl)benzene, 1,3-bis(4-aminobenzyl)benzene, bis(4-aminophenyl)terephthalate, bis(3-aminophenyl)terephthalate, bis(4-aminophenyl)isophthalate, bis(3-aminophenyl)isophthalate, 1,4-phenylenebis[(4-aminophenyl)methanone], 1,4-phenylenebis[(3-aminophenyl)methanone], 1,3-phenylenebis[(4-aminophenyl)methanone], 1,3-phenylenebis[(3-aminophenyl)methanone], 1,4-phenylenebis(4-aminobenzoic acid), 1,4-phenylenebis(3-aminobenzoic acid), 1,3-phenylenebis(4-aminobenzoic acid), 1,3-phenylenebis(3-aminobenzoic acid), N,N'-(1,4-phenylene)bis(4-aminobenzamide), N,N'-(1,3-phenylene)bis(4-aminobenzamide), N,N'-(1,4 -phenylene)bis(3-aminobenzamide), N,N'-(1,3-phenylene)bis(3-aminobenzamide), bis(4-aminophenyl)terephthalamide, bis(3-aminophenyl)terephthalamide, bis(4-aminophenyl)isophthalamide, bis(3-aminophenyl)isophthalamide, 2,2-bis[4-(4-aminophenoxy)phenyl]propane, 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane, 4,4'-bis( 4-aminophenoxy)diphenylsulfone, 2,6-diaminopyridine, 2,4-diaminopyridine, 2,4-diamino-1,3,5-triazine, 2,6-diaminodibenzofuran, 2,7-diaminodibenzofuran, 3,6-diaminodibenzofuran, 2,6-diaminocarbazole, 2,7-diaminocarbazole, 3,6-diaminocarbazole, 2,4-diamino-6-isopropyl-1,3,5-triazine, 2,5-bis(4-aminophenyl)-1,3,4-oxadia It may also contain zole, 1,3-diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, 1,10-diaminodecane, 1,11-diaminoundecane, 1,12-diaminododecane, 1,4-diaminocyclohexane, 1,3-diaminocyclohexane, bis(4-aminocyclohexyl)methane, and bis(4-amino-3-methylcyclohexyl)methane.

[0041] In one embodiment, the dianhydride subunit R2 may be obtained by the reaction of a dianhydride monomer, and the dianhydride monomer may include at least one of 1,2,3,4-cyclobutanetetracarboxylic acid dianhydride (CBDA) and other aromatic dianhydride compounds, for example, pyromellitic dianhydride, 2,3,6,7-naphthalenetetracarboxylic acid dianhydride, 1,2,5,6-naphthalenetetracarboxylic acid dianhydride, 1,4,5,8-naphthalenetetracarboxylic acid dianhydride, 2,3,6,7-anthracenetetracarboxylic acid dianhydride, 1,2, 5,6-Anthracenetetracarboxylic dianhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, 2,2',3,3'-biphenyltetracarboxylic dianhydride, 2,3,3',4'-biphenyltetracarboxylic dianhydride, 3,3',4,4'-benzophenonetetracarboxylic dianhydride, 2,3,3',4'-benzophenonetetracarboxylic dianhydride, bis(3,4-dicarboxyphenyl)methane dianhydride, bis(3,4-dicarboxyphenyl)ether dianhydride, bis(3,4-dicarboxyphenyl)sulfone dianhydride 2,2-bis(3,4-dicarboxyphenyl)propane dianhydride, 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride, 2,5-dicarboxymethyl terephthalic acid dianhydride, 4,6-dicarboxymethyl isophthalic acid dianhydride, 4-(2,5-dioxotetrahydro-3-furyl)phthalic anhydride, 1,4-bis(2,5-dioxotetrahydro-3-furyl)benzene, 1,4-bis(2,6-dioxotetrahydro-4-pyran)benzene, 1,4-bis(2,5-dioxotetrahydro-3-methyl-3-furyl) Lyl)benzene, 1,4-bis(2,6-dioxotetrahydro-4-methyl-4-pyran)benzene, 1,2,3,4-butanetetracarboxylic acid dianhydride, 1,2,3,4-cyclobutanetetracarboxylic acid dianhydride, 1,2-dimethyl-1,2,3,4-cyclobutanetetracarboxylic acid dianhydride, 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic acid dianhydride, 1,2,3,4-tetramethyl-1,2,3,4-cyclobutanetetracarboxylic acid dianhydride, 1,2,3,4-cyclopentanetetracarboxylic acid dianhydride, 2,3,4,5-tetrahydrofurantetracarboxylic acid dianhydride, 2,3,5-tricarboxycyclopentylacetic acid dianhydride, 1,2,4,5-cyclohexanetetracarboxylic acid dianhydride, 4-(2,5-dioxotetrahydro-3-furyl)-cyclohexane-1,2-dicarboxylic acid anhydride, 5-(2,5-dioxotetrahydro-3-furyl)-3-methyl-3-cyclohexene-1,2-dicarboxylic acid anhydride, bicyclo[2.2.2]octo-7-ene It may further contain at least one of the following: 2,3,5,6-tetracarboxylic dianhydride, 3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalenesuccinate dianhydride, 3,4-dicarboxy-1,2,3,4-tetrahydro-6-methyl-1-naphthalenesuccinate dianhydride, bicyclo[3.3.0]octane-2,4,6,8-tetracarboxylic dianhydride, and 3,3',4,4'-dicyclohexyltetracarboxylic dianhydride.

[0042] Furthermore, in one embodiment, the first polyimide molecular chain contains the unit shown in the following chemical formula 14, [ka] Here, R1 is selected from diamine subunits having 1 to 50 carbon atoms, and R2 is selected from dianhydride subunits having 8 to 14 carbon atoms. In other words, a diamine monomer and a dianhydride monomer that satisfy the requirement of carbon atoms can be selected from the diamine monomer and dianhydride monomer exemplified in the above example and reacted, and the diamine monomer yields R1, and the dianhydride monomer yields R2.

[0043] In one embodiment, the first polyimide molecular chain contains the unit shown in the following chemical formula 15, [ka] Here, X is selected from substituted or unsubstituted aliphatic groups having 1 to 50 carbon atoms, or substituted or unsubstituted aromatic groups having 1 to 50 carbon atoms; Y is selected from substituted or unsubstituted cycloalkyl groups having 4 to 10 carbon atoms; and R is selected from hydrogen atoms or substituted or unsubstituted alkyl groups having 1 to 5 carbon atoms.

[0044] In one example, X may be a phenyl group, and Y may be [ka] It may also be a hydrogen atom, and therefore the corresponding diamine monomer is [ka] The corresponding dianhydride monomer is [ka] That is the case.

[0045] In one embodiment, m is 6 or less, and n is 6 or less, for example, m may be equal to 1, 2, 3, 4, 5, or 6, and n may be equal to 1, 2, 3, 4, 5, or 6. It should be noted that m and n are used solely to represent the number of C atoms, and OH atoms are not included.

[0046] Furthermore, referring to Figure 1, in one embodiment, the display panel further includes a second orientation layer 22 installed on the side of the second substrate 12 closer to the first substrate 11, the second orientation layer 22 having a second polyimide molecular chain, the second polyimide molecular chain containing the unit shown in Chemical Formula 1.

[0047] It should be explained that A in the first polyimide molecular chain and A in the second polyimide molecular chain are each independently selected from at least one of a group having a phenoxy group and a group having a biphenyl group, that is, the first polyimide molecular chain and the second polyimide molecular chain may be the same or different, and if the first polyimide molecular chain and the second polyimide molecular chain are different, the units shown in Chemical Formula 1 in the first polyimide molecular chain and the second polyimide molecular chain may be different, and the units shown in Chemical Formula 1 and the linkage structure between the diamine structure and the dianhydride structure in the first polyimide molecular chain and the second polyimide molecular chain may be different, but are not limited thereto.

[0048] In one embodiment of this application, the units shown in Chemical Formula 1 are the following units [ka] Selected from.

[0049] It should be explained that in the implementation and application process, the orientation layer in the display panel can be hydrolyzed, and the products after hydrolysis can be verified by test methods such as MALDI-MS (matrix-assisted laser desorption / ionization technology), pyrolysis GC / MS (pyrolysis-gas chromatography / mass spectrometry technology), HPLC (high-performance liquid chromatography), LCMS (liquid chromatography), GC (gas chromatography), GCMS (gas chromatography-mass spectrometry), NMR (nuclear magnetic resonance technology), ICP-OES (inductively coupled plasma emission spectrometer), EDS (X-ray energy spectroscopy), and ESR (electron paramagnetic resonance) to verify whether the orientation layer contains the units shown in Chemical Formula 1 according to the examples of this application.

[0050] In one embodiment, the display panel further includes a liquid crystal layer 30 placed between a first alignment layer 21 and a second alignment layer 22, the liquid crystal layer 30 containing liquid crystal molecules 31, each containing at least one of a phenoxy group and a biphenyl group, and thus the unit shown in chemical formula 1 has a group similar to that of the liquid crystal molecule 31, and can improve the alignment restricting force of the liquid crystals of the first alignment layer 21 and the second alignment layer 22.

[0051] In one embodiment, the liquid crystal molecule 31 may be selected from the following compounds. [ka]

[0052] Continuing to refer to Figure 1, in one embodiment, the display panel further includes a first electrode layer 41 placed on a first substrate 11 and a second electrode layer 42 placed on a second substrate 12, and the liquid crystal layer 30 includes liquid crystal molecules 31 placed between the first electrode layer 41 and the second electrode layer 42.

[0053] It should be explained that one of the first substrate 11 and the second substrate 12 may be an array substrate, and the other of the first substrate 11 and the second substrate 12 may be a color film substrate. For example, if the first substrate 11 is an array substrate, the second substrate 12 is a color film substrate, the first electrode layer 41 may be a pixel electrode, the second electrode layer 42 may be a common electrode, and an electric field may be generated between the first electrode layer 41 and the second electrode layer 42 to control the deflection of liquid crystal molecules 31 in the liquid crystal layer 30 and control the amount of light passing through the liquid crystal layer 30.

[0054] In one embodiment, both the first electrode layer 41 and the second electrode layer 42 may be manufactured using a transparent conductive material, such as ITO material.

[0055] In one embodiment, the cell thickness of the liquid crystal layer 30 is between 0.1 μm and 100 μm, and more preferably, the cell thickness of the liquid crystal layer 30 is between 1 μm and 5 μm. The liquid crystal layer 30 may contain liquid crystal monomolecules, liquid crystal single crystals, or liquid crystal mixed crystals.

[0056] In one embodiment, the thickness of the first orientation layer 21 may be 0.1 nm or more and 2 μm or less, more preferably 10 nm or more and 200 nm or less, and the thickness of the second orientation layer 22 may be 0.1 nm or more and 2 μm or less, more preferably 10 nm or more and 200 nm or less.

[0057] In one embodiment, the orientation angle between the first orientation layer 21 and the second orientation layer 22 is irrelevant, and the angle between them may be arbitrary. Preferably, the orientation angle between the first orientation layer 21 and the second orientation layer 22 is parallel, or the orientation angle between the first orientation layer 21 and the second orientation layer 22 is perpendicular to 90°.

[0058] Following the above, the embodiment of the present application improves the degree of crosslinking between the first alignment layer 21 and the second alignment layer 22 by forming the structure shown in Chemical Formula 1 on the first polyimide molecular chain and the second polyimide molecular chain 22 of the first alignment layer 21, thereby improving the hardness of the first alignment layer 21 and the second alignment layer 22 and reducing the probability of scratching the first alignment layer 21 and the second alignment layer 22. On the other hand, the structure shown in Chemical Formula 1 has at least one of a phenoxy group and a biphenyl group, and both the phenoxy group and the biphenyl group have a liquid crystal-like structure, which can effectively improve the alignment restricting force of the first alignment layer 21 and the second alignment layer 22 on the liquid crystal, and can further improve the light leakage phenomenon of the display panel.

[0059] Furthermore, the embodiments of the present application further provide an alignment film composition comprising a diamine monomer, a dianhydride monomer, and an additive, wherein the additive has the structure shown in the following chemical formula 21. [ka] Here, A contains at least one of a phenoxy group and a biphenyl group, and p1, p2, q1, and q2 are all integers of 1 or greater.

[0060] In one embodiment, p1, p2, q1 and q2 may all be 6 or less, for example, p1, p2, q1 and q2 may each be independently selected from any one of 1, 2, 3, 4, 5, or 6.

[0061] In one embodiment of the present application, the mass percentage of the additive in the liquid crystal composition is 0.1% or more and 20% or less. It should be explained that in the alignment film composition according to the embodiment of the present application, the molar ratio of diamine monomer to dianhydride monomer is 1:1, and the mass percentage of the additive in the liquid crystal composition may be 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, or 20%.

[0062] In one embodiment, the additive is the following compound [ka] You may choose from the following.

[0063] In one embodiment, the diamine monomers are p-phenylenediamine, m-phenylenediamine, 2,4-diaminotoluene, 2,5-diaminotoluene, 2,6-diaminotoluene, 2,4-dimethyl-1,3-diaminobenzene, 2,5-dimethyl-1,4-diaminobenzene, 2,3,5,6-tetramethyl-1,4-diaminobenzene, 2,4-diaminophenol, 2,5-diaminophenol, 4,6-diaminoresorcinol, 2,5-diaminobenzoic acid, 3,5-diaminobenzoic acid, N,N-diallyl-2,4-diaminoaniline, N,N- diallyl-2,5-diaminoaniline, 4-aminobenzylamine, 3-aminobenzylamine, 2-(4-aminophenyl)ethylamine, 2-(3-aminophenyl)ethylamine, 1,5-naphthalenediamine, 2,7-naphthalenediamine, 4,4'-diaminobiphenyl, 3,4'-diaminobiphenyl, 3,3'-diaminobiphenyl, 2,2'-dimethyl-4,4'-diaminobiphenyl, 3,3'-dimethyl-4,4'-diaminobiphenyl, 3,3'-dimethoxy-4,4'-diaminobiphenyl, 3,3'-dicarboxy-4,4 '-diaminobiphenyl, 3,3'-dicarboxy-4,4'-diaminobiphenyl, 3,3'-difluoro-4,4'-diaminobiphenyl, 2,2'-trifluoromethyl-4,4'-diaminobiphenyl, 3,3'-trifluoromethyl-4,4'-diaminobiphenyl, 4,4'-diaminodiphenylmethane, 3,3'-diaminodiphenylmethane, 3,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl ether, 3,3'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, 4,4'-diaminodiphenyl Nylsulfone, 3,3'-diaminodiphenylsulfone, 4,4'-diaminodiphenylamine, 3,3'-diaminodiphenylamine, 3,4'-diaminodiphenylamine, N-methyl(4,4'-diaminodiphenyl)amine, N-methyl(3,3'-diaminodiphenyl)amine, N-methyl(3,4'-diaminodiphenyl)amine, 4,4'-diaminobenzophenone, 3,3'-diaminobenzophenone, 3,4'-diaminobenzophenone, 4,4'-diamino-N-benzoanilide, 1,2-bis(4-aminophenyl)ethane, 1,2-bis(3-aminophenyl)ethane, 4,4'-diaminodiphenylacetylene, 1,3-bis(4-aminophenyl)propane, 1,3-bis(3-aminophenyl)propane, 2,2-bis(4-aminophenyl)propane, 2,2-bis(3-aminophenyl)propane, 2,2-bis(3-amino-4-methylphenyl)propane, 2,2-bis(4-aminophenyl)hexafluoropropane, 2,2-bis(3-aminophenyl)hexafluoropropane, 2,2-bis(3-amino-4-methylphenyl)hexafluoropropane Pan, 1,3-bis(4-aminophenoxy)propane, 1,4-bis(4-aminophenoxy)butane, 1,5-bis(4-aminophenoxy)pentane, 1,6-bis(4-aminophenoxy)hexane, 1,7-bis(4-aminophenoxy)heptane, 1,8-bis(4-aminophenoxy)octane, 1,9-bis(4-aminophenoxy)nonane, 1,10-bis(4-aminophenoxy)decane, 1,11-bis(4-aminophenoxy)undecane, 1,12-bis(4-aminophenoxy)dodecane, bis(4-aminophenyl ) Malonic acid ester, bis(4-aminophenyl) succinate ester, bis(4-aminophenyl) glutarate ester, bis(4-aminophenyl) adipic acid ester, bis(4-aminophenyl) hemelic acid ester, bis(4-aminophenyl) octanedionate ester, bis(4-aminophenyl) azelaic acid ester, bis(4-aminophenyl) sebacate ester, 1,4-bis(4-aminophenyl)benzene, 1,3-bis(4-aminophenyl)benzene, 1,4-bis(4-aminophenoxy)benzene, 1,3-bis 4-aminophenoxy)benzene, 1,4-bis(4-aminobenzyl)benzene, 1,3-bis(4-aminobenzyl)benzene, bis(4-aminophenyl)terephthalate, bis(3-aminophenyl)terephthalate, bis(4-aminophenyl)isophthalate, bis(3-aminophenyl)isophthalate, 1,4-phenylenebis[(4-aminophenyl)methanone], 1,4-phenylenebis[(3-aminophenyl)methanone], 1,3-phenylenebis[(4-aminophenyl)methanone], 1,3-Phenylenebis[(3-aminophenyl)methanone], 1,4-Phenylenebis(4-aminobenzoic acid), 1,4-Phenylenebis(3-aminobenzoic acid), 1,3-Phenylenebis(4-aminobenzoic acid), 1,3-Phenylenebis(3-aminobenzoic acid), N,N'-(1,4-phenylene)bis(4-aminobenzamide), N,N'-(1,3-phenylene)bis(4-aminobenzamide), N,N'-(1,4-phenylene)bis(3-aminobenzamide ), N,N'-(1,3-phenylene)bis(3-aminobenzamide), bis(4-aminophenyl)terephthalamide, bis(3-aminophenyl)terephthalamide, bis(4-aminophenyl)isophthalamide, bis(3-aminophenyl)isophthalamide, 2,2-bis[4-(4-aminophenoxy)phenyl]propane, 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane, 4,4'-bis(4-aminophenoxy)diphenyl Nylsulfone, 2,6-diaminopyridine, 2,4-diaminopyridine, 2,4-diamino-1,3,5-triazine, 2,6-diaminodibenzofuran, 2,7-diaminodibenzofuran, 3,6-diaminodibenzofuran, 2,6-diaminocarbazole, 2,7-diaminocarbazole, 3,6-diaminocarbazole, 2,4-diamino-6-isopropyl-1,3,5-triazine, 2,5-bis(4-aminophenyl)-1,3,4-oxadiazole, 1,3 -May also contain diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, 1,10-diaminodecane, 1,11-diaminoundecane, 1,12-diaminododecane, 1,4-diaminocyclohexane, 1,3-diaminocyclohexane, bis(4-aminocyclohexyl)methane, and bis(4-amino-3-methylcyclohexyl)methane.

[0064] In one embodiment, the dianhydride monomer may include at least one of 1,2,3,4-cyclobutanetetracarboxylic acid dianhydride (CBDA) and other aromatic dianhydride compounds, for example, pyromellitic dianhydride, 2,3,6,7-naphthalenetetracarboxylic acid dianhydride, 1,2,5,6-naphthalenetetracarboxylic acid dianhydride, 1,4,5,8-naphthalenetetracarboxylic acid dianhydride, 2,3,6,7-anthracenetetracarboxylic acid dianhydride, 1,2,5,6-anthracenetetracarboxylic acid dianhydride, and 3,3',4,4'-biphenyltetracarboxylic acid Rubonic acid dianhydride, 2,2',3,3'-biphenyltetracarboxylic acid dianhydride, 2,3,3',4'-biphenyltetracarboxylic acid dianhydride, 3,3',4,4'-benzophenonetetracarboxylic acid dianhydride, 2,3,3',4'-benzophenonetetracarboxylic acid dianhydride, bis(3,4-dicarboxyphenyl)methane dianhydride, bis(3,4-dicarboxyphenyl)ether dianhydride, bis(3,4-dicarboxyphenyl)sulfone dianhydride, 2,2-bis(3,4-dicarboxyphenyl)propane dianhydride, 2,2-bis(3,4-dicarboxyphenyl) Boxyphenyl)hexafluoropropane dianhydride, 2,5-dicarboxymethylterephthalic acid dianhydride, 4,6-dicarboxymethylisophthalic acid dianhydride, 4-(2,5-dioxotetrahydro-3-furyl)phthalic anhydride, 1,4-bis(2,5-dioxotetrahydro-3-furyl)benzene, 1,4-bis(2,6-dioxotetrahydro-4-pyran)benzene, 1,4-bis(2,5-dioxotetrahydro-3-methyl-3-furyl)benzene, 1,4-bis(2,6-dioxotetrahydro-4-methyl-4-pyran)benzene, 1,2 ,3,4-butanetetracarboxylic acid dianhydride, 1,2,3,4-cyclobutanetetracarboxylic acid dianhydride, 1,2-dimethyl-1,2,3,4-cyclobutanetetracarboxylic acid dianhydride, 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic acid dianhydride, 1,2,3,4-tetramethyl-1,2,3,4-cyclobutanetetracarboxylic acid dianhydride, 1,2,3,4-cyclopentanetetracarboxylic acid dianhydride, 2,3,4,5-tetrahydrofurantetracarboxylic acid dianhydride, 2,3,5-tricarboxycyclopentylacetic acid dianhydride, 1,2,It may further contain at least one of the following: 4,5-cyclohexanetetracarboxylic dianhydride, 4-(2,5-dioxotetrahydro-3-furyl)-cyclohexane-1,2-dicarboxylic anhydride, 5-(2,5-dioxotetrahydro-3-furyl)-3-methyl-3-cyclohexene-1,2-dicarboxylic anhydride, bicyclo[2.2.2]octo-7-ene-2,3,5,6-tetracarboxylic dianhydride, 3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalene succinic acid dianhydride, 3,4-dicarboxy-1,2,3,4-tetrahydro-6-methyl-1-naphthalene succinic acid dianhydride, bicyclo[3.3.0]octane-2,4,6,8-tetracarboxylic dianhydride, and 3,3',4,4'-dicyclohexyltetracarboxylic dianhydride.

[0065] Furthermore, in one embodiment, the diamine monomer may be selected from diamine monomers having 1 to 50 carbon atoms, and the dianhydride monomer may be selected from dianhydride monomers having 8 to 14 carbon atoms, for example, the corresponding diamine monomer is [ka] The corresponding dianhydride monomer is [ka] That is the case.

[0066] Furthermore, the embodiments of this application, in combination with specific embodiments, provide a manufacturing process for the additives in the above embodiments. Compound M1: [ka]

[0067] The synthesis route for compound M1 is as follows: [ka]

[0068] Reactants M11 and M12 in a molar ratio of 1:4 were dissolved in dichloromethane solvent, catalyst M13 was added, and the reaction was carried out at room temperature for 24 hours (h) to obtain product M1. The nuclear magnetic spectrum of product M1 is shown in Figure 3. Compound M2: [ka] Synthesis process of compound M2: [ka]

[0069] Reactants M21 and M22 in a molar ratio of 1:4 were dissolved in dichloromethane solvent, catalyst M23 was added, and the reaction was carried out at room temperature for 24 hours (h) to obtain product M2. The nuclear magnetic spectrum of product M2 is shown in Figure 4. Compound M3: [ka] Synthesis process of compound M3: [ka]

[0070] Reactants M31 and M32 in a molar ratio of 1:4 were dissolved in dichloromethane solvent, catalyst M33 was added, and the reaction was carried out at room temperature for 24 hours (h) to obtain product M3. The nuclear magnetic spectrum of product M3 is shown in Figure 5.

[0071] Following the above, the embodiments of the present application provide Comparative Examples 1 and 2 and Examples 1 to 3 to verify the performance of the alignment film composition and display panel according to the embodiments of the present application.

[0072] In Comparative Example 1, p-phenylenediamine was used in a molar ratio of 50:50. [ka] and 1,3-dimethylcyclobutanetetracarboxylic acid [ka] Polyimide PI-1 was obtained by polymerization reaction.

[0073] In Comparative Example 2, a polyimide was obtained by polymerizing p-phenylenediamine and 1,3-dimethylcyclobutanetetracarboxylic acid in a molar ratio of 50:50. Polyimide PI-2, produced with 5 wt% of a comparative additive, was then added to it. The structure of the comparative additive in Comparative Example 2 was as follows: [ka] As shown.

[0074] The synthesis process for the comparative additive is as follows: [ka]

[0075] Reactants Z11 and Z12 in a molar ratio of 1:4 were dissolved in dichloromethane solvent, catalyst Z13 was added, and the reaction was carried out at room temperature for 24 hours (h) to obtain product Z1. The nuclear magnetic spectrum of product Z1 is shown in Figure 6.

[0076] In Example 1, a polyimide was obtained by polymerizing p-phenylenediamine and 1,3-dimethylcyclobutanetetracarboxylic acid in a molar ratio of 50:50, and polyimide PI-3, produced with 5 wt% of an additive, was added thereto. Here, the structure of the additive in Example 2 is as follows: [ka] As shown.

[0077] In Example 2, a polyimide was obtained by polymerizing p-phenylenediamine and 1,3-dimethylcyclobutanetetracarboxylic acid in a molar ratio of 50:50. Polyimide PI-4, produced with 5 wt% of an additive, was then added to it. The structure of the additive in Example 2 is as follows: [ka] As shown.

[0078] In Example 3, a polyimide was obtained by polymerizing p-phenylenediamine and 1,3-dimethylcyclobutanetetracarboxylic acid in a molar ratio of 50:50. Polyimide PI-5, produced with 5 wt% of an additive, was then added to it. The structure of the additive in Example 3 is as follows: [ka] As shown.

[0079] Next, each of the manufactured polyimides was fired to form a film, and its mechanical hardness was tested. Furthermore, an electro-optical liquid crystal cell as shown in Figure 1 was manufactured, and the afterimage produced by the long-term AC drive was tested to verify the improvement in mechanical hardness due to the addition of additives and the improvement in afterimage (PI orientation restricting force) due to the long-term AC drive in Examples 1, 2, and 3.

[0080] In the mechanical hardness test, the test specimen was placed and fixed on the fired PI film, and the pencil was held at a 45° angle to the test specimen to prevent the lead from breaking. The test was performed by scratching the specimen about 1 cm in front of the tester at a constant speed. The scratching speed was 1 mm / s. After one scratch, the tip of the lead was resharpened, and the test should be repeated five times with a pencil of the same hardness rating. When observing and evaluating the degree of damage to the coating, if the base or undercoat was not visible in two or fewer of the five tests, the test should be replaced with a pencil with a hardness rating one order of magnitude higher, and the same test should be performed. If the coating was damaged two or more times (every five tests), the hardness rating of the pencil at that time was read, and the next hardness rating after that pencil rating was recorded. The results shown in Table 1 below were obtained.

[0081] [Table 1]

[0082] During long-term AC drive testing, an electrode-equipped substrate was prepared. The substrate was a glass substrate measuring 30 mm x 35 mm and with a thickness of 0.7 mm. An ITO electrode with a full-surface pattern was formed on the glass substrate as a counter electrode for the first layer. A SiN (silicon nitride) film, formed using CVD (chemical vapor deposition), was formed as a second layer on the counter electrode of the first layer. The thickness of the SiN film of the second layer was 500 nm. A comb-shaped pixel electrode, formed by patterning the ITO film on the SiN film of the second layer, was constructed as a third layer. The region corresponding to the pixel electrode may be considered a pixel, and furthermore, multiple pixels, such as a first pixel and a second pixel, could be obtained. The size of each pixel was 10 mm in length and approximately 5 mm in width.

[0083] At this time, the counter electrode of the first layer and the pixel electrode of the third layer were electrically insulated by the SiN film of the second layer. As shown in Figure 7, the pixel electrode 411 of the third layer had a comb-like shape, with multiple electrode elements 3 μm wide and bent at an internal angle of 160° in the center, arranged in parallel at intervals of 6 μm. Each pixel had a first region 4111 and a second region 4112, with the line connecting the bent portions of the multiple electrode elements serving as the boundary.

[0084] Comparing the first region 4111 and the second region 4112 of each pixel, the formation direction of the electrode elements of the pixel electrodes constituting them was different. Using the rubbing direction of the liquid crystal alignment film, described later, as a reference, in the first region 4111 of the pixel, the electrode elements of the pixel electrode 411 were formed in a manner that forms a +10° angle (clockwise), and in the second region 4112 of the pixel, the electrode elements of the pixel electrode 411 were formed in a manner that forms a -10° angle (clockwise). In the first region 4111 and the second region 4112 of each pixel, the direction of rotational movement of the liquid crystal within the substrate surface induced by the voltage applied between the pixel electrode 411 and the counter electrode was configured to be in opposite directions.

[0085] The polyimides PI-1, PI-2, PI-3, PI-4, and PI-5 were each fired onto the above substrate to form a uniform 100 nm film. These were then irradiated with linearly polarized ultraviolet light at a wavelength of 254 nm and an irradiation intensity of 500 mJ / cm2, and fired again to obtain substrates with polyimide alignment layers. Two of these polyimide alignment layer substrates were used as a pair, and a sealant was printed onto the substrate in a shape other than the liquid crystal injection port, so that the liquid crystal alignment film surfaces faced each other and the rubbing directions were opposite parallel. The sealant was then cured to create an empty cell with a cell gap of 3.5 μm. Negative liquid crystal MLC 2767 (manufactured by Merck) was injected into this empty cell by a reduced-pressure injection method, and the injection port was sealed to obtain an FFS type liquid crystal cell.

[0086] Furthermore, using the liquid crystal cell fabricated as described above, an AC voltage of ±6V was applied for 120 hours at a frequency of 60Hz in a constant temperature environment of 60°C. A short circuit was then formed between the pixel electrode and the counter electrode of the liquid crystal cell, and it was left at room temperature for one day. After this period, the liquid crystal cell was placed between two polarizing plates configured with orthogonal polarization axes, and the backlight was turned on with no voltage applied. The configuration angle of the liquid crystal cell was adjusted in a way that minimized the brightness of the transmitted light. The rotation angle Δ was calculated when the liquid crystal cell was rotated from the angle in which the second region 4112 of the first pixel was darkest to the angle in which the first region 4111 of the first pixel was darkest. Similarly, for the second pixel, the second region 4112 and the first region 4111 were compared, and a similar angle Δ was calculated. The results shown in Table 2 below were obtained.

[0087] [Table 2]

[0088] As can be seen from Table 1 above, by adding an additive to the alignment film composition, the hardness of the manufactured alignment layer can be effectively improved, and the probability of scratching the alignment layer can be reduced. Furthermore, as can be seen from Table 2, by adopting the additive according to the embodiment of the present application, the hardness of the alignment layer can be improved, and the angle of the AC afterimage result (Δangle) can be reduced compared to the comparative additive in Comparative Example 2. The smaller the angle of the AC afterimage result (Δangle), that is, the smaller the difference from the initial state after long-term AC driving, the stronger the alignment restricting force on the liquid crystal. As can be seen from Tables 1 and 2, the embodiment of the present application can effectively improve the hardness of the first alignment layer 21 and the second alignment layer 22, effectively improve the alignment restricting force of the first alignment layer 21 and the second alignment layer 22 on the liquid crystal, and further improve the light leakage phenomenon of the display panel.

[0089] Referring to Figure 8, the embodiment of the present application further provides a display device comprising the display panel 51 described in the above embodiment and a backlight module 52, wherein the display panel 51 is installed on the light-emitting side of the backlight module 52.

[0090] To ensure understanding, since the display device according to the embodiment of the present application has the same display panel as the above embodiment, this display device has the same beneficial effects as the above embodiment and will not be described further here.

[0091] The alignment film composition and display panel according to the embodiments of the present application have been described in detail above. While the principles and embodiments of the present application have been described using specific examples in this specification, the above descriptions of embodiments are merely intended to aid in understanding the methods and core ideas of the present application. Furthermore, those skilled in the art can modify the specific embodiments and scope of application based on the ideas of the present application. In short, the contents of this specification should not be interpreted as limiting the present application.

Claims

1. It is a display panel, The first substrate and A second substrate is installed opposite the first substrate, The first substrate is positioned on the side of the first substrate closer to the second substrate and includes a first oriented layer having a first polyimide molecular chain containing units selected from the units shown in the following formula 1, 【Chemistry 1】 A display panel characterized by the following features.

2. The display panel according to claim 1, further comprising a second orientation layer installed on the side of the second substrate closer to the first substrate, wherein the second orientation layer has a second polyimide molecular chain, and the second polyimide molecular chain includes the unit shown in formula 1.

3. The display panel according to claim 2, characterized in that A in the first polyimide molecular chain and A in the second polyimide molecular chain are independently selected from at least one of a group having a phenoxy group and a group having a biphenyl group.

4. The display panel according to claim 2, further comprising a liquid crystal layer placed between the first alignment layer and the second alignment layer, wherein the liquid crystal layer comprises liquid crystal molecules, and the liquid crystal molecules comprise at least one of a phenoxy group and a biphenyl group.

5. An alignment film composition comprising a diamine monomer, a dianhydride monomer, and an additive, wherein the additive is selected from the compounds shown in the following chemical formula 2. 【Chemistry 2】 An orientation film composition characterized by the following:

6. The orientation film composition according to claim 5, characterized in that the mass ratio of the additive in the orientation film composition is 0.1% or more and 20% or less.

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