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] The present application relates to the field of display technology, and more particularly to an alignment film composition and a display panel. [Background technology]

[0002] A conventional liquid crystal display panel includes an array substrate and a color film substrate disposed opposite to each other, and a liquid crystal layer disposed between the array substrate and the color film substrate, where the array substrate provides switch signals and data signals, the color film substrate provides colorization, and the deflection of liquid crystal molecules in the liquid crystal layer controls the display brightness.

[0003] Conventional LCD panels provide liquid crystal molecules with an initial alignment direction by forming an alignment film on the array substrate and color film substrate. However, the PS (isolation pillars) located between the array substrate and color film substrate in the LCD panel can move, causing rubbing between the alignment film and the substrate, which can scratch the alignment film and generate chips. This can result in insufficient alignment control force in the scratched areas of the alignment film, destroying bright spots and causing light leakage from the LCD panel in dark conditions. Summary of the Invention

[0004] The present 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 crystals, thereby improving the light leakage phenomenon of the display panel.

[0005] An embodiment of the present application provides a display panel, the display panel comprising: a first substrate; a second substrate disposed opposite the first substrate; a first alignment layer disposed on a side of the first substrate closer to the second substrate, the first alignment layer having a first polyimide molecular chain containing a unit represented by the following Chemical Formula 1, [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.

[0006] In one embodiment of the present application, the first polyimide molecular chain contains a unit represented by the following Chemical Formula 2: [ka] wherein 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 application, the first polyimide molecular chain contains a unit represented by the following Chemical Formula 3: [ka] Here, X is selected from a substituted or unsubstituted aliphatic group having 1 to 50 carbon atoms or a substituted or unsubstituted aromatic group having 1 to 50 carbon atoms, Y is selected from a substituted or unsubstituted cycloalkyl having 4 to 10 carbon atoms, and R is selected from a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms.

[0008] In one embodiment of the present application, the display panel further includes a second alignment layer disposed on a side of the second substrate closer to the first substrate, the second alignment layer having a second polyimide molecular chain, and the second polyimide molecular chain includes a unit represented by Chemical Formula 1.

[0009] In one embodiment of the present application, 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 represented by Chemical Formula 1 is a unit represented by Chemical Formula 4 below. [ka] is selected from.

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

[0012] According to the above object of the present application, an embodiment of the present application further provides an alignment film composition, the alignment film composition comprising a diamine monomer, a dianhydride monomer, and an additive, the additive having a structure represented by 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] is selected from.

[0015] According to the above object of the present application, an embodiment of the present application further provides a display device, which includes the display panel and a backlight module.

[0016] The beneficial effects of the present invention are as follows: By forming the structure represented by Chemical Formula 1 in the first polyimide molecular chains of the first alignment layer, the present invention can improve the cross-linking degree of the first alignment layer, improve the hardness of the first alignment layer, and reduce the probability of the first alignment layer being scratched; meanwhile, the structure represented by Chemical Formula 1 contains at least one of a phenoxy group and a biphenyl group, both of which have liquid crystal-like structures, which can effectively improve the alignment control force of the first alignment layer on the liquid crystal, and further improve the light leakage phenomenon of the display panel. [Brief explanation of the drawings]

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

[0018] The following describes the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application.

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

[0020] In this application, unless otherwise specified, the terms used for orientation, such as "up" and "down," generally refer to the up and down of the device in its actual use or operating state, specifically the drawing direction in the drawings, and "inside" and "outside" refer to the orientation relative to the contour of the device. In this application, "optionally," "selectively," and "selectable" mean either presence or absence, i.e., selection is made from either one of two parallel solutions, "present" or "absent." When multiple "options" appear in a technical solution, each "option" is independent unless otherwise specified and there is no contradiction or mutual relationship. In this application, technical features described as open include closed technical solutions consisting of the listed features, and also open technical solutions including the listed features.

[0021] In this application, the terms aromatic group, aromatic, and aromatic ring system have the same meaning and are interchangeable. An "aryl group, aromatic group, or aromatic ring system" refers to an aromatic hydrocarbon group formed by removing one hydrogen atom from an aromatic ring compound. It may be a monocyclic aryl group, a fused-ring aryl group, or a polycyclic aryl group, in which at least one ring of the polycyclic ring is an aromatic ring system. For example, a "substituted or unsubstituted aryl group having 6 to 40 ring atoms" refers to an aryl group having 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. Suitable examples include, but are not limited to, phenyl, biphenyl, terphenyl, naphthyl, anthracenyl, phenanthrenyl, fluoranthenyl, triphenylene, pyrenyl, perylenyl, tetraphenyl, fluorenyl, perylene, acenaphthylenyl, and derivatives thereof. It is understood 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, triarylamine, and diaryl ether systems should also be included in the definition of an aryl group.

[0022] In this application, the terms heteroaromatic group, heteroaromatic group, and heteroaromatic ring system have the same meaning and are interchangeable. A "heteroaryl or heteroaromatic group or heteroaromatic ring system" refers to an aryl group in which at least one carbon atom has been replaced with a non-carbon atom, which may be an N atom, an O atom, or a S atom. For example, a "substituted or unsubstituted heteroaryl having 5 to 40 ring atoms" refers to 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, wherein the heteroaryl is optionally further substituted. Suitable examples include, but are not limited to, thienyl, furanyl, pyrrolyl, diazolyl, triazolyl, imidazolyl, pyridyl, bipyridyl, and pyridyl. rimidinyl, triazinyl, acridinyl, pyridazinyl, pyrazinyl, quinolinyl, isoquinolinyl, quinazolinyl, quinoxalinyl, phthalazinyl, pyridopyrimidinyl, pyridopyrazinyl, benzothienyl, benzofuradinyl, indolyl, pyrroloiimidazolyl, pyrrolopyrrolyl, thienopyrrolyl, thienothienyl, furopyrrolyl, furofuryl, thienofuryl, benzisoxazolyl, benzisothiazolyl, benzimidazolyl, benzonaphthyl, phenanthridinyl, primary lysinyl, quinazolinone, dibenzothienyl, dibenzofuranyl, carbazolyl group and derivatives thereof.

[0023] As used herein, "substituted" means that one or more hydrogen atoms in a substituent are replaced with a substituent, and when the same substituent occurs multiple times, they may be independently selected from different groups, and when a generalization contains multiple R, the R may be independently selected from different groups. In the examples of 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 with one or more substituents R, and the substituents R are selected from the group consisting of a deuterium atom, a cyano group, an isocyano group, a nitro group, a halogen atom, an alkyl group having 1 to 20 ring atoms, a heterocyclyl group having 3 to 20 ring atoms, an aromatic group having 6 to 20 ring atoms, a heteroaromatic group having 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 hydroxy group, and a trifluoromethyl group, but are not limited thereto, and the above groups may be further substituted with substituents acceptable in the art. In -NR'R'', R' and R'' are each independently selected from H, a deuterium atom, a cyano group, an isocyano group, a nitro group, a halogen group, an alkyl group having 1 to 10 carbon atoms, a heterocyclyl group having 3 to 20 ring atoms, an aromatic group having 6 to 20 ring atoms, and a heteroaromatic group having 5 to 20 ring atoms, but are not limited to these. Preferably, R is selected from a deuterium atom, a cyano group, an isocyano group, a nitro group or a halogen group, an alkyl group containing 1 to 10 C 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 hydroxy group and a trifluoromethyl group, but is not limited thereto, and the above groups may be further substituted with a substituent acceptable in the art.

[0024] As used herein, an "amine group" refers to a derivative of an amine and has the structural characteristics of --NR'R'' where R' and R'' are defined above.

[0025] In the present application, the "number of ring atoms" refers to the number of atoms constituting the ring itself of a structural compound in which atomic bonds are synthesized to form a ring (for example, a monocyclic compound, a fused ring compound, a bridged compound, a carbocyclic compound, or a heterocyclic compound). When this ring is substituted with a substituent, the atoms contained in the substituent are not included in the ring-forming atoms. The same applies to the "number of ring atoms" described below unless otherwise specified. For example, a benzene ring has 6 ring atoms, a naphthalene ring has 10 ring atoms, and a thienyl group has 5 ring atoms.

[0026] In this application, a "*" attached to a single bond indicates a bond or fusion site.

[0027] In this application, unless a linking site is explicitly specified in a group, any linkable site is indicated as the linking site in the group.

[0028] In the present application, unless the condensation site is explicitly specified, it means that any condensable site in the group is the condensation site, and preferably, two or more sites in the ortho position in the group are the condensation sites.

[0029] In the present application, when the same group has a plurality of substituents with the same symbol, the respective substituents may be the same or different from each other, for example, [ka] In the formula (I), the six Rs on the benzene ring may be the same or different.

[0030] In the present application, a single bond connecting a substituent means that the substituent can be connected to any position on the ring, for example, through the corresponding ring. [ka] means that R can be linked to any substitutable site on the benzene ring. For example, [ka] teeth [ka] but [ka] This means that a parallel ring can be formed with any position on the benzene ring in

[0031] According to this application, cyclic alkyl or cycloalkyl 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 the present application, "two adjacent R1, R3, or R5 form a ring together" means a ring system formed by two adjacent R1, R3, or R5 bonding to each other, and the ring system can be selected from an aliphatic hydrocarbon ring, an aliphatic heterocyclic ring, an aromatic hydrocarbon ring, or an aromatic heterocyclic ring. Preferably, [ka] can be formed.

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

[0035] Here, the first substrate 11 is disposed opposite the second substrate 12, and the first alignment layer 21 is disposed on the side of the first substrate 11 closer to the second substrate 12.

[0036] Furthermore, the first alignment layer 21 has a first polyimide molecular chain, and the first polyimide molecular chain contains a unit represented by 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 practical application process, the embodiment of the present application forms a structure shown in Chemical Formula 1 in the first polyimide molecular chain of the first alignment layer 21, thereby improving the degree of cross-linking of the first alignment layer 21, improving the hardness of the first alignment layer 21, and reducing the probability of scratches on the first alignment layer 21. Meanwhile, the structure shown in Chemical Formula 1 contains at least one of a phenoxy group and a biphenyl group, both of which have liquid crystal-like structures, which can effectively improve the alignment control force of the first alignment layer 21 on the liquid crystal, and further improve the light leakage phenomenon of the display panel.

[0038] It should be explained that when A contains at least one of a phenoxy group and a biphenyl group, it 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 the phenoxy group and the biphenyl group, 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, and the unit L represented by 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 crosslinking degree of the first polyimide molecular chain, i.e., improving the crosslinking degree of the first alignment layer 21, thereby improving the hardness of the first alignment layer 21 and reducing the probability of scratches on the first alignment 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, 3,4-diaminobenzoic acid, 4,6 ... ,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-benzanilide, 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)malonic acid ester, bis(4-aminophenyl)succinic acid ester, bis(4-aminophenyl)glutaric acid ester, bis(4-aminophenyl)adipate, bis(4-aminophenyl)hemeline acid ester, bis(4-aminophenyl)octanedionate, bis(4-aminophenyl)azelate, bis(4-aminophenyl)sebacic acid ester, 1,4-bis(4-aminophenyl)benzene, 1,3-bis(4-aminophenyl)benzene Zene, 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)terephthalic acid ester, bis(3-aminophenyl)terephthalic acid ester, bis(4-aminophenyl)isophthalic acid ester, bis(3-aminophenyl)isophthalic acid ester, 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 sulfone, 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-oxadiazol-1,3,4-diazine The diaminobenzoate may include 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 dianhydride (CBDA) and other aromatic dianhydride compounds, such as pyromellitic dianhydride, 2,3,6,7-naphthalenetetracarboxylic dianhydride, 1,2,5,6-naphthalenetetracarboxylic dianhydride, 1,4,5,8-naphthalenetetracarboxylic dianhydride, 2,3,6,7-anthracenetetracarboxylic 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-dicarboxymethylterephthalic dianhydride, 4,6-dicarboxymethylisophthalic 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-furan)benzene (aryl)benzene, 1,4-bis(2,6-dioxotetrahydro-4-methyl-4-pyran)benzene, 1,2,3,4-butanetetracarboxylic dianhydride, 1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2-dimethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2,3,4-tetramethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2,3,4-cyclopentanetetracarboxylic dianhydride, 2,3,4,5-Tetrahydrofurantetracarboxylic dianhydride, 2,3,5-tricarboxycyclopentylacetic dianhydride, 1,2,4,5-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]oct-7-ene- The composition may further include at least one of 2,3,5,6-tetracarboxylic dianhydride, 3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalene succinic dianhydride, 3,4-dicarboxy-1,2,3,4-tetrahydro-6-methyl-1-naphthalene succinic 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 a unit represented by the following 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. That is, diamine monomers and dianhydride monomers that satisfy the carbon atom number requirement can be selected from the diamine monomers and dianhydride monomers exemplified in the above examples and reacted, and the diamine monomers will yield R1, and the dianhydride monomers will yield R2.

[0043] In one embodiment, the first polyimide molecular chain includes a unit represented by the following formula: [ka] Here, X is selected from a substituted or unsubstituted aliphatic group having 1 to 50 carbon atoms or a substituted or unsubstituted aromatic group having 1 to 50 carbon atoms, Y is selected from a substituted or unsubstituted cycloalkyl having 4 to 10 carbon atoms, and R is selected from a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms.

[0044] In one embodiment, X may be a phenyl group and Y may be [ka] and R may be a hydrogen atom, so that the corresponding diamine monomer is [ka] and the corresponding dianhydride monomer is [ka] is.

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

[0046] Furthermore, still referring to FIG. 1, in one embodiment, the display panel further includes a second alignment layer 22 disposed on the second substrate 12 closer to the first substrate 11, the second alignment layer 22 having a second polyimide molecular chain, and the second polyimide molecular chain includes a unit represented by Chemical Formula 1.

[0047] It should be noted 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 containing a phenoxy group and a group containing a biphenyl group; that is, the first polyimide molecular chain and the second polyimide molecular chain may be the same or different. When the first polyimide molecular chain and the second polyimide molecular chain are different, the units represented by Chemical Formula 1 in the first polyimide molecular chain and the second polyimide molecular chain may be different, and the units represented by Chemical Formula 1 and the linking structures of the diamine structure and the dianhydride structure in the first polyimide molecular chain and the second polyimide molecular chain may be different, and are not limited thereto.

[0048] In one embodiment of the present application, the unit represented by Chemical Formula 1 is the following unit [ka] is selected from.

[0049] It should be noted that in the practical application process, the alignment layer in the display panel can be hydrolyzed, and the hydrolysis product can be verified by testing means 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 optical emission spectrometer), EDS (X-ray energy spectroscopy), ESR (electron paramagnetic resonance) etc. to verify whether the alignment layer contains the unit shown in Chemical Formula 1 according to the embodiment of the present application.

[0050] In one embodiment, the display panel further includes a liquid crystal layer 30 disposed between the first alignment layer 21 and the second alignment layer 22, the liquid crystal layer 30 including liquid crystal molecules 31, the liquid crystal molecules 31 including at least one of a phenoxy group and a biphenyl group, so that the unit represented by Chemical Formula 1 has a group similar to the liquid crystal molecule 31, and can improve the alignment control force of the first alignment layer 21 and the second alignment layer 22 on the liquid crystal.

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

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

[0053] It should be noted 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, when 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, and 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 the 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 made of a transparent conductive material, such as an ITO material.

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

[0056] In one embodiment, the thickness of the first alignment layer 21 may be 0.1 nm or more and 2 μm or less, more preferably, the thickness of the first alignment layer 21 may be 10 nm or more and 200 nm or less, and the thickness of the second alignment layer 22 may be 0.1 nm or more and 2 μm or less, more preferably, the thickness of the second alignment layer 22 may be 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 the two 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 forms a structure shown in Chemical Formula 1 between the first polyimide molecular chains of the first alignment layer 21 and the second polyimide molecular chains 22, thereby improving the degree of cross-linking of the first alignment layer 21 and the second alignment layer 22, thereby improving the hardness of the first alignment layer 21 and the second alignment layer 22, and reducing the probability of scratches on the first alignment layer 21 and the second alignment layer 22. Meanwhile, the structure shown in Chemical Formula 1 contains at least one of a phenoxy group and a biphenyl group, both of which have liquid crystal-like structures, which can effectively improve the alignment control force of the first alignment layer 21 and the second alignment layer 22 against the liquid crystal, and further improve the light leakage phenomenon of the display panel.

[0059] In addition, an embodiment of the present application further provides an alignment film composition, the alignment film composition including a diamine monomer, a dianhydride monomer, and an additive, the additive having a structure represented by 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 independently be selected from any one of 1, 2, 3, 4, 5 and 6.

[0061] In one embodiment of the present application, the mass proportion of the additive in the liquid crystal composition is 0.1% or more and 20% or less. It should be noted that in the alignment film composition according to this embodiment of the present application, the molar ratio of the diamine monomer to the dianhydride monomer is 1:1, and the mass proportion 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 a compound [ka] may be selected from:

[0063] In one embodiment, the diamine monomer is 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'-diaminodiphenylether, 3,3'-diaminodiphenylether, 3,4'-diaminodiphenylether, 4,4'-diaminodiphenyl Nilsulfone, 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)succinic acid ester, bis(4-aminophenyl)glutaric acid ester, bis(4-aminophenyl)adipic acid ester, bis(4-aminophenyl)hemeline acid ester, bis(4-aminophenyl)octanedionoic acid ester, bis(4-aminophenyl)azelaic acid ester, bis(4-aminophenyl)sebacic acid 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, Bis(4-aminophenoxy)benzene, 1,4-bis(4-aminobenzyl)benzene, 1,3-bis(4-aminobenzyl)benzene, bis(4-aminophenyl)terephthalic acid ester, bis(3-aminophenyl)terephthalic acid ester, bis(4-aminophenyl)isophthalic acid ester, bis(3-aminophenyl)isophthalic acid ester, 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 Nilsulfone, 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 -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, bis(4-amino-3-methylcyclohexyl)methane.

[0064] In one embodiment, the dianhydride monomer may include at least one of 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA) and other aromatic dianhydride compounds, such as pyromellitic dianhydride, 2,3,6,7-naphthalenetetracarboxylic dianhydride, 1,2,5,6-naphthalenetetracarboxylic dianhydride, 1,4,5,8-naphthalenetetracarboxylic dianhydride, 2,3,6,7-anthracenetetracarboxylic dianhydride, 1,2,5,6-anthracenetetracarboxylic dianhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, and the like. carboxylic 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)propane dianhydride 4,6-Dicarboxymethylisophthalic 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,The composition may further include at least one of 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]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride, 3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalenesuccinic dianhydride, 3,4-dicarboxy-1,2,3,4-tetrahydro-6-methyl-1-naphthalenesuccinic dianhydride, bicyclo[3.3.0]octane-2,4,6,8-tetracarboxylic dianhydride, and 3,3',4,4'-dicyclohexyltetracarboxylic dianhydride.

[0065] Further, 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 may be: [ka] and the corresponding dianhydride monomer is [ka] is.

[0066] Furthermore, the examples of the present application provide manufacturing processes for the additives in the above examples in combination with specific examples. Compound M1: [ka]

[0067] The synthetic route of compound M1 is as follows. [ka]

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

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

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

[0071] Following the above, the present invention provides 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 present invention.

[0072] In Comparative Example 1, p-phenylenediamine in a molar ratio of 50:50 [ka] and 1,3-dimethylcyclobutanetetracarboxylic acid [ka] The resulting mixture was polymerized to obtain polyimide PI-1.

[0073] In Comparative Example 2, p-phenylenediamine and 1,3-dimethylcyclobutanetetracarboxylic acid in a molar ratio of 50:50 were polymerized to obtain polyimide, to which 5 wt% of the comparative additive was added to produce polyimide PI-2, where the structure of the comparative additive in Comparative Example 2 is: [ka] As shown in the figure.

[0074] The synthesis process of the comparative additive is as follows. [ka]

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

[0076] In Example 1, p-phenylenediamine and 1,3-dimethylcyclobutanetetracarboxylic acid in a molar ratio of 50:50 were polymerized to obtain polyimide, to which 5 wt% of the additive-prepared polyimide PI-3 was added. The additive in Example 2 has the following structure: [ka] As shown in the figure.

[0077] In Example 2, p-phenylenediamine and 1,3-dimethylcyclobutanetetracarboxylic acid in a molar ratio of 50:50 were polymerized to obtain polyimide, to which 5 wt% of polyimide PI-4 prepared with additives was added. The structure of the additive in Example 2 is: [ka] As shown in the figure.

[0078] In Example 3, p-phenylenediamine and 1,3-dimethylcyclobutanetetracarboxylic acid in a molar ratio of 50:50 were polymerized to obtain polyimide, to which 5 wt% of polyimide PI-5 prepared with additives was added. The structure of the additive in Example 3 is: [ka] As shown in the figure.

[0079] Next, each of the produced polyimides was baked to form a film, and its mechanical hardness was tested. Furthermore, an electro-optical conversion liquid crystal cell as shown in Figure 1 was produced, and the image retention caused by long-term AC driving was tested using long-term AC driving to verify the improvement in mechanical hardness due to the addition of additives in Examples 1, 2, and 3, and the improvement in image retention (PI alignment control force) caused by long-term AC driving.

[0080] During the mechanical hardness test, the tester places a pencil on the baked PI film and fixes it. The pencil is then angled 45° to the test piece to prevent the lead from breaking, and the tester scratches the test piece firmly at a constant speed of approximately 1 cm in front of the tester. The scratching speed is 1 mm / s. After each scratch, the tip of the lead is re-sharpened, and the test is repeated five times using a pencil with the same hardness rating. When observing and evaluating the damage to the coating, if the base or primer coating is visible in only two or fewer tests out of five, a pencil with a hardness rating one digit higher should be used and the same test repeated. If the coating is damaged more than twice (every five tests), the hardness rating of the pencil at that time is read, and the next hardness rating after that pencil hardness rating is recorded. The results are shown in Table 1 below.

[0081] [Table 1]

[0082] During the long-term AC drive test, an electrode-equipped substrate was prepared. The substrate was a 30 mm x 35 mm glass substrate with a thickness of 0.7 mm. An ITO electrode with a full-surface pattern was formed on the glass substrate as the first layer of counter electrodes. A SiN (silicon nitride) film was formed on the first layer of counter electrodes using a CVD (chemical vapor deposition) method as the second layer. The thickness of the second SiN film was 500 nm. A comb-shaped pixel electrode was formed on the second SiN film by patterning an ITO film as the third layer. The area corresponding to the pixel electrode may be considered a pixel. Multiple pixels, such as a first pixel and a second pixel, were obtained. Each pixel was 10 mm long and approximately 5 mm wide.

[0083] At this time, the counter electrode of the first layer and the pixel electrode of the third layer were electrically insulated by the action of 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 interior angle of 160° at the center, arranged in parallel at intervals of 6 μm, and one pixel had a first region 4111 and a second region 4112, with the line connecting the bent portions of the multiple electrode elements as the boundary.

[0084] Comparing the first region 4111 and the second region 4112 of each pixel, the forming directions of the electrode elements of the pixel electrodes constituting them were different. When the rubbing direction of the liquid crystal alignment film described below is used 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 formed an angle of +10° (clockwise), and in the second region 4112 of the pixel, the electrode elements of the pixel electrode 411 were formed in a manner that formed an angle of -10° (clockwise). In the first region 4111 and the second region 4112 of each pixel, the directions of rotation of the liquid crystal in the substrate plane induced by application of a voltage between the pixel electrode 411 and the counter electrode were configured to be opposite to each other.

[0085] The polyimides PI-1, PI-2, PI-3, PI-4, and PI-5 were each baked onto the substrate to form a uniform 100 nm film. This was then irradiated with linearly polarized UV light at 254 nm wavelength and 500 mJ / cm² of irradiation intensity and further baked to obtain a substrate with a polyimide alignment layer. Two of these substrates with polyimide alignment layers were combined into a pair, and a second substrate was bonded to the pair with the liquid crystal alignment film surfaces facing each other and the rubbing directions antiparallel. A sealant was printed on the substrate, except for the liquid crystal injection port, so that the substrate was shaped like a 3.5 μm cell gap. Negative liquid crystal MLC 2767 (Merck) was then injected into the empty cell by vacuum injection, and the injection port was sealed to obtain an FFS-mode liquid crystal cell.

[0086] Furthermore, using the liquid crystal cell prepared above, an AC voltage of ±6V was applied at a frequency of 60 Hz for 120 hours 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 the cell was left at room temperature for one day. After leaving the cell, the liquid crystal cell was placed between two polarizers with orthogonal polarization axes. The backlight was turned on with no voltage applied, and the configuration angle of the liquid crystal cell was adjusted so that the brightness of the transmitted light was minimized. The rotation angle Δ was calculated by rotating the liquid crystal cell from the angle at which the second region 4112 of the first pixel was darkest to the angle at which the first region 4111 of the first pixel was darkest. Similarly, the second region 4112 and the first region 4111 of the second pixel 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, adding an additive to the alignment film composition can effectively improve the hardness of the resulting alignment layer and further reduce the probability of scratches on the alignment layer. Also, as can be seen from Table 2, by using 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 image lag result (Δangle) can be reduced compared to the comparative additive in Comparative Example 2. The smaller the angle of the AC image lag result (Δangle), i.e., the smaller the difference from the initial state after long-term AC driving, the stronger the alignment control force on the liquid crystal. Therefore, 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, and can also effectively improve the alignment control 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.

[0089] Also, referring to FIG. 8, an embodiment of the present application further provides a display device, which includes a display panel 51 described in the above embodiment and a backlight module 52, and the display panel 51 is installed on the light-emitting side of the backlight module 52.

[0090] As can be understood, 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 further described here.

[0091] The above provides a detailed introduction to the alignment film composition and display panel according to the examples of the present application, and the present specification describes the principles and embodiments of the present application using specific examples. However, the explanation of the above examples is merely intended to aid in understanding the method and core idea of ​​the present application, and a person skilled in the art may modify the specific embodiments and application scope based on the idea of ​​the present application. In short, the contents of this specification should not be construed as limiting the present application.

Claims

1. A display panel, a first substrate; a second substrate disposed opposite the first substrate; a first alignment layer disposed on the first substrate closer to the second substrate, the first alignment layer having a first polyimide molecular chain containing a unit represented by the following Chemical Formula 1, 【Chemistry 1】 wherein A includes 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.

2. The first polyimide molecular chain contains a unit represented by the following Chemical Formula 2: 【Chemistry 2】 Here, R １ is selected from diamine subunits having 1 to 50 carbon atoms, and R ２ 2. The display panel of claim 1, wherein is selected from dianhydride subunits having 8 to 14 carbon atoms.

3. The first polyimide molecular chain contains a unit represented by the following Chemical Formula 3: 【Transformation 3】 2. The display panel according to claim 1, wherein X is selected from a substituted or unsubstituted aliphatic group having 1 to 50 carbon atoms or a substituted or unsubstituted aromatic group having 1 to 50 carbon atoms, Y is selected from a substituted or unsubstituted cycloalkyl having 4 to 10 carbon atoms, and R is selected from a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms.

4. 2. The display panel according to claim 1, further comprising a second alignment layer disposed on a side of the second substrate closer to the first substrate, the second alignment layer having a second polyimide molecular chain, and the second polyimide molecular chain containing a unit represented by Chemical Formula 1.

5. 5. The display panel according to claim 4, wherein 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.

6. 5. The display panel of claim 4, further comprising a liquid crystal layer disposed between the first alignment layer and the second alignment layer, the liquid crystal layer comprising liquid crystal molecules, the liquid crystal molecules comprising at least one of a phenoxy group and a biphenyl group.

7. The unit represented by Chemical Formula 1 can be a unit represented by Chemical Formula 4 below. 【Chemistry 4】 7. The display panel according to claim 1, wherein the display panel is selected from the group consisting of:

8. An alignment film composition, comprising a diamine monomer, a dianhydride monomer, and an additive, wherein the additive has a structure represented by the following Chemical Formula 5: 【Transformation 5】 Here, A contains at least one of a phenoxy group and a biphenyl group, and p １ , p ２ , q １ and q ２ and each of the above is an integer of 1 or more.

9. 9. The alignment film composition according to claim 8, wherein the mass ratio of the additive in the liquid crystal composition is 0.1% or more and 20% or less.

10. The additive is a compound represented by the following formula 6: 【Transformation 6】 The alignment film composition according to claim 8, wherein the alignment film composition is selected from the group consisting of:

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