CN115947658A - Alignment film additive, alignment film, liquid crystal display panel and manufacturing method thereof - Google Patents
Alignment film additive, alignment film, liquid crystal display panel and manufacturing method thereof Download PDFInfo
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- CN115947658A CN115947658A CN202211698861.2A CN202211698861A CN115947658A CN 115947658 A CN115947658 A CN 115947658A CN 202211698861 A CN202211698861 A CN 202211698861A CN 115947658 A CN115947658 A CN 115947658A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 80
- 239000000654 additive Substances 0.000 title claims abstract description 59
- 230000000996 additive effect Effects 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 156
- 239000000463 material Substances 0.000 claims abstract description 25
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 12
- 125000000753 cycloalkyl group Chemical group 0.000 claims abstract description 4
- 125000004185 ester group Chemical group 0.000 claims abstract description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 4
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims abstract description 4
- 150000001875 compounds Chemical class 0.000 claims description 79
- 239000002243 precursor Substances 0.000 claims description 44
- 239000004642 Polyimide Substances 0.000 claims description 33
- 229920001721 polyimide Polymers 0.000 claims description 33
- 239000002253 acid Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 4
- SJMYWORNLPSJQO-UHFFFAOYSA-N tert-butyl 2-methylprop-2-enoate Chemical group CC(=C)C(=O)OC(C)(C)C SJMYWORNLPSJQO-UHFFFAOYSA-N 0.000 claims description 3
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical group CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000012535 impurity Substances 0.000 abstract description 9
- 150000002500 ions Chemical class 0.000 abstract description 9
- 239000010408 film Substances 0.000 description 89
- 239000000565 sealant Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 235000010354 butylated hydroxytoluene Nutrition 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- QEQBMZQFDDDTPN-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy benzenecarboperoxoate Chemical compound CC(C)(C)OOOC(=O)C1=CC=CC=C1 QEQBMZQFDDDTPN-UHFFFAOYSA-N 0.000 description 1
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 description 1
- YQMXOIAIYXXXEE-UHFFFAOYSA-N 1-benzylpyrrolidin-3-ol Chemical compound C1C(O)CCN1CC1=CC=CC=C1 YQMXOIAIYXXXEE-UHFFFAOYSA-N 0.000 description 1
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 1
- CWPKTBMRVATCBL-UHFFFAOYSA-N 3-[1-[1-[(2-methylphenyl)methyl]piperidin-4-yl]piperidin-4-yl]-1h-benzimidazol-2-one Chemical compound CC1=CC=CC=C1CN1CCC(N2CCC(CC2)N2C(NC3=CC=CC=C32)=O)CC1 CWPKTBMRVATCBL-UHFFFAOYSA-N 0.000 description 1
- HHDFKOSSEXYTJN-UHFFFAOYSA-N 4-[2-(4-aminophenoxy)ethoxy]aniline Chemical compound C1=CC(N)=CC=C1OCCOC1=CC=C(N)C=C1 HHDFKOSSEXYTJN-UHFFFAOYSA-N 0.000 description 1
- YGYCECQIOXZODZ-UHFFFAOYSA-N 4415-87-6 Chemical compound O=C1OC(=O)C2C1C1C(=O)OC(=O)C12 YGYCECQIOXZODZ-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
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- 238000001308 synthesis method Methods 0.000 description 1
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Abstract
The embodiment of the application provides an alignment film additive, an alignment film, a liquid crystal display panel and a manufacturing method thereof. The general structural formula of the alignment film additive is
Wherein n is 2 to 4; a is cycloalkyl, phenyl orAn ester group; sp is H, - (CH) 2 ) m ‑、‑(CH 2 ) m At least one of-CH 2 -is substituted by-O-, -S-, -CO-O-, -O-CO-, -O-CO-O-, -OCH 2 ‑、‑CH 2 O-substituted radical, or- (CH) 2 ) m -wherein at least one H atom is substituted by F, cl, wherein m is 1 to 8; b is-OH or-COOH; r is a polymerizable group. When the alignment film additive is applied to the alignment film, the compactness of the alignment film can be improved, so that impurity ions in the CF substrate and the TFT substrate can be prevented from diffusing into the liquid crystal material, the liquid crystal material is prevented from being polluted by the impurity ions, the voltage holding ratio of the liquid crystal material can be improved, and the problem of residual image of a liquid crystal display panel is solved.
Description
Technical Field
The application relates to the field of display, in particular to an alignment film additive, an alignment film, a liquid crystal display panel and a manufacturing method thereof.
Background
With the development of Display technology, flat panel Display devices such as Liquid Crystal Displays (LCDs) have advantages of high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and become the mainstream of Display devices.
Most of the liquid crystal display devices in the market currently are backlight type liquid crystal displays (lcds), which include a liquid crystal display panel and a backlight module (backlight module). The liquid crystal display panel has the working principle that liquid crystal molecules are placed in two parallel glass substrates, a plurality of vertical and horizontal fine wires are arranged between the two glass substrates, and the liquid crystal molecules are controlled to change directions by electrifying or not, so that light rays of the backlight module are refracted out to generate pictures.
The Liquid Crystal display panel generally includes a Color Filter (CF) substrate, a Thin Film Transistor (TFT) substrate, a Liquid Crystal (LC) sandwiched between the Color Filter substrate and the TFT substrate, and a Sealant (Sealant). The CF substrate and the TFT substrate of the liquid crystal display panel are respectively provided with an alignment film which is mainly used for enabling liquid crystal molecules to be arranged according to a certain direction. However, due to the poor compactness of the conventional alignment film, impurity ions in the CF substrate and the TFT substrate pass through the alignment film and diffuse into the liquid crystal material, so that the liquid crystal material IS polluted, the Voltage Holding Ratio (VHR) of the liquid crystal material IS reduced, and finally, the problem of Image Sticking (IS) occurs when the liquid crystal display panel performs frame switching.
Disclosure of Invention
The embodiment of the application provides an alignment film additive, an alignment film, a liquid crystal display panel and a manufacturing method thereof, and when the alignment film additive is applied to the alignment film, the compactness of the alignment film can be improved, so that impurity ions in a CF substrate and a TFT substrate can be prevented from diffusing into a liquid crystal material, the liquid crystal material is prevented from being polluted by the impurity ions, the voltage holding ratio of the liquid crystal material can be improved, and the problem of residual image of the liquid crystal display panel is solved.
In a first aspect, an embodiment of the present disclosure provides an alignment layer additive, where the alignment layer additive has a general structural formula
Wherein n is 2 to 4;
a is cycloalkyl, phenyl or an ester group;
sp is H, - (CH) 2 ) m -、-(CH 2 ) m At least one of-CH 2 -is substituted by-O-, -S-, -CO-O-, -O-CO-, -O-CO-O-, -OCH 2 -、-CH 2 O-substituted radical, or- (CH) 2 ) m -wherein at least one H atom is substituted by F, cl, wherein m is 1 to 8;
b is-OH or-COOH;
r is a polymerizable group.
In some embodiments, R is t-butyl methacrylate or t-butyl acrylate.
In some embodiments, the alignment film additive includes at least one of compound AD1, compound AD2, compound AD3, compound AD4, compound AD5, compound AD6, compound AD7, compound AD8, compound AD9, compound AD10, compound AD11, compound AD 12; wherein,
the structural formula of the compound AD1 is
The structural formula of the compound AD2 is
The structural formula of the compound AD3 is
The structural formula of the compound AD4 is->
The compound AD5 has a structural formula of>
The structural formula of the compound AD6 is
The structural formula of the compound AD7 is->
The structural formula of the compound AD8 is->
The structural formula of the compound AD9 is
The structural formula of the compound AD10 is->
The structural formula of the compound AD11 is
The structural formula of the compound AD12 is
In a second aspect, embodiments of the present application provide an alignment film, which is formed by copolymerizing polyimide acid and the alignment film additive as described above.
In some embodiments, the content of the alignment film additive in the alignment film is 1wt% to 10wt%.
In a third aspect, an embodiment of the present application provides a liquid crystal display panel, including:
a first substrate;
a second substrate disposed opposite to the first substrate;
the liquid crystal material is arranged between the first substrate and the second substrate;
a first alignment film on a side of the first substrate disposed toward the second substrate;
a second alignment film on a side of the second substrate disposed toward the first substrate;
wherein the first alignment film and/or the second alignment film are each copolymerized from a polyimidic acid and the alignment film additive of any of claims 1-3.
In some embodiments, the thickness of the first alignment film and the thickness of the second alignment film are both 80nm to 120nm.
In some embodiments, the content of the alignment layer additive in the first alignment layer is 1wt% to 10wt%, and the content of the alignment layer additive in the second alignment layer is 1wt% to 10wt%.
In a fourth aspect, an embodiment of the present application provides a method for manufacturing a liquid crystal display panel, including:
providing a polyimide acid solution and the alignment film additive, and mixing the polyimide acid solution and the alignment film additive to obtain a precursor solution;
providing a first substrate and a second substrate, applying the precursor solution on the first substrate and the second substrate, curing the precursor solution on the first substrate and the precursor solution on the second substrate, forming a first alignment film on the first substrate, and forming a second alignment film on the second substrate;
aligning and combining the first substrate and the second substrate, wherein the first alignment film is positioned on one side of the first substrate, which is arranged towards the second substrate, and the second alignment film is positioned on one side of the second substrate, which is arranged towards the first substrate;
and arranging a liquid crystal material between the first substrate and the second substrate to obtain the liquid crystal display panel.
In some embodiments, the curing the precursor solution on the first substrate and the precursor solution on the second substrate comprises:
heating the precursor solution on the first substrate and the precursor solution on the second substrate for the first time;
and carrying out secondary curing on the precursor solution on the first substrate and the precursor solution on the second substrate by adopting an ultraviolet polarized light irradiation method.
The alignment film additive provided by the embodiment of the application can be copolymerized with polyimide acid to form an alignment film, wherein a B group in the alignment film additive is-OH or-COOH, when the B group is-OH, -OH can react with carboxyl in the polyimide acid, when the B group is-COOH, -COOH can react with amine in the polyimide acid, and because the alignment film additive contains a plurality of B groups which can respectively react with a plurality of polyimide acid molecules, namely, one alignment film additive molecule can connect a plurality of polyimide molecules together, the compactness of the alignment film can be improved, besides, an R group in the alignment film additive is a polymeric group, and when the alignment film additive and the polyimide acid are copolymerized, the R group can be further polymerized, so that the compactness of the alignment film can be further improved; it can be understood that, since the alignment film containing the alignment film additive has high compactness, impurity ions in the CF substrate and the TFT substrate can be prevented from diffusing into the liquid crystal material, so that the liquid crystal material is prevented from being polluted by the impurity ions, and thus the voltage holding ratio of the liquid crystal material can be improved, and the problem of image sticking of the liquid crystal display panel can be solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic diagram of a synthesis process of compound AD1 provided in an example of the present application.
Fig. 2 is a schematic structural diagram of a liquid crystal display panel according to an embodiment of the present application.
Fig. 3 is a flowchart of a method for manufacturing a liquid crystal display panel according to an embodiment of the present disclosure.
Detailed Description
The technical solution in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The embodiment of the application provides an alignment film additive, which has a general structural formula
Wherein n is 2 to 4 (e.g., 2, 3, 4);
a is cycloalkyl, phenyl or an ester group;
sp is H, - (CH) 2 ) m -、-(CH 2 ) m At least one of-CH 2 -is substituted by-O-, -S-, -CO-O-, -O-CO-, -O-CO-O-, -OCH 2 -、-CH 2 O-substituted radical, or- (CH) 2 ) m -wherein at least one H atom is substituted by F, cl, wherein m is 1 to 8 (e.g. 1,2, 3, 4, 5, 6, 7, 8);
b is-OH or-COOH;
r is a polymerizable group.
Illustratively, R is t-butyl methacrylate or t-butyl acrylate.
Illustratively, the alignment film additive may include at least one of compound AD1, compound AD2, compound AD3, compound AD4, compound AD5, compound AD6, compound AD7, compound AD8, compound AD9, compound AD10, compound AD11, compound AD 12; wherein,
the structural formula of the compound AD1 is
The structural formula of the compound AD2 is
The structural formula of the compound AD3 is
The structural formula of the compound AD4 is
The structural formula of the compound AD5 is
The structural formula of the compound AD6 is
The structural formula of the compound AD7 is
The structural formula of the compound AD8 is
The structural formula of the compound AD9 is
The structural formula of the compound AD10 is
The structural formula of the compound AD11 is
The structural formula of the compound AD12 is
Referring to fig. 1, fig. 1 is a schematic diagram of a synthesis process of compound AD1 provided in the examples of the present application. The synthesis method of the compound AD1 can comprise the following steps:
5mmol of CHEP (1,4-cyclohexanedimethanol diglycidyl ether), 11mmol of AA (acrylic acid), 0.025mmol of BHT (2, 6-di-tert-butyl-p-cresol) as a polymerization inhibitor, 0.05mmol of TBPB (t-butylperoxybenzoate) as a catalyst and an amount of PGMEA (propylene glycol methyl ether acetate) as a solvent were mixed together under a nitrogen atmosphere (the solid content in the mixture was 40 wt%), and magnetically stirred (600 rpm) at a temperature of 110 ℃ for 3 hours to obtain the final product, compound AD1.
The alignment film additive provided by the embodiment of the application can be copolymerized with polyimide acid to form an alignment film, a group B in the alignment film additive is-OH or-COOH, when the group B is-OH, the-OH can react with a carboxyl group in the polyimide acid, when the group B is-COOH, the-COOH can react with an amine group in the polyimide acid, and since the alignment film additive contains a plurality of groups B which can respectively react with a plurality of molecules of the polyimide acid, that is, one alignment film additive molecule can connect a plurality of molecules of the polyimide together, the compactness of the alignment film can be improved, and in addition, a group R in the alignment film additive is a polymerizable group, when the alignment film additive is copolymerized with the polyimide acid, the group R can be further polymerized, so that the compactness of the alignment film can be further improved; it can be understood that, since the alignment film containing the alignment film additive has high compactness, impurity ions in the CF substrate and the TFT substrate can be prevented from diffusing into the liquid crystal material, so that the liquid crystal material is prevented from being polluted by the impurity ions, and thus the voltage holding ratio of the liquid crystal material can be improved, and the problem of image sticking of the liquid crystal display panel can be solved.
The embodiment of the application also provides an alignment film, which is formed by copolymerizing polyimide acid and the alignment film additive in any embodiment.
Illustratively, the content of the alignment film additive in the alignment film is 1wt% to 10wt%, such as 1wt%, 3wt%, 5wt%, 7wt%, 10wt%, etc.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a liquid crystal display panel according to an embodiment of the present disclosure. The embodiment of the present application further provides a liquid crystal display panel 100, which includes a first substrate 10, a second substrate 20, a liquid crystal material 40, a first alignment film 31, and a second alignment film 32, wherein the first substrate 10 and the second substrate 20 are disposed opposite to each other, the liquid crystal material 40 is disposed between the first substrate 10 and the second substrate 20, the first alignment film 31 is located on the first substrate 10 on a side facing the second substrate 20, and the second alignment film 32 is located on the second substrate 20 on a side facing the first substrate 10.
The first alignment film 31 and/or the second alignment film 32 are formed by copolymerizing polyimide acid and the alignment film additive in any of the above embodiments.
As shown in fig. 2, in the liquid crystal display panel 100 of the embodiment of the present invention, the first alignment film 31 and the second alignment film 32 are formed by copolymerizing polyimide acid and an alignment film additive (compound AD 1), and the content of the alignment film additive in the first alignment film 31 and the second alignment film 32 is 1wt%, and the first alignment film and the second alignment film in the conventional liquid crystal display panel are both made of Polyimide (PI), a test result shows that the Voltage Holding Ratio (VHR) of the liquid crystal display panel 100 of the embodiment of the present invention is 98.9%, and the Voltage Holding Ratio (VHR) of the conventional liquid crystal display panel is 94.5%, and it can be seen that, compared with the conventional liquid crystal display panel, the liquid crystal display panel 100 of the embodiment of the present invention has a higher voltage holding ratio, and in addition, when the conventional liquid crystal display panel is switched, the conventional liquid crystal display panel has no image sticking phenomenon, and when the conventional liquid crystal display panel is switched, the image sticking phenomenon is severe.
Illustratively, the thickness of the first alignment film 31 and the thickness of the second alignment film 32 are both 80nm to 120nm, such as 80nm, 90nm, 100nm, 110nm, 120nm, and the like.
Illustratively, the content of the alignment film additive in the first alignment film 31 is 1wt% to 10wt%, for example, 1wt%, 3wt%, 5wt%, 7wt%, 10wt%, etc.
Illustratively, the content of the alignment film additive in the second alignment film 32 is 1wt% to 10wt%, such as 1wt%, 3wt%, 5wt%, 7wt%, 10wt%, and the like.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for fabricating a liquid crystal display panel according to an embodiment of the present disclosure. The embodiment of the present application further provides a manufacturing method of a liquid crystal display panel, where the manufacturing method can be used to manufacture the liquid crystal display panel 100 in any of the above embodiments, and the manufacturing method may include:
and S100, providing a polyimide acid solution and the alignment film additive in any embodiment, and mixing the polyimide acid solution and the alignment film additive to obtain a precursor solution.
Illustratively, "providing a polyimide acid solution" may specifically include: 6.1072g of 1, 2-bis (4-aminophenoxy) ethane, 2.7035g of p-phenylenediamine, and 133mL of NMP (N-methylpyrrolidone) as a solvent were mixed in a three-necked flask, and after the solid was sufficiently dissolved, 9.8055g of cyclobutanetetracarboxylic dianhydride was added to the three-necked flask and reacted at room temperature for 24 hours to obtain a polyimide acid (PAA) solution.
In the examples of the present application, room temperature means 10 ℃ to 30 ℃, for example, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃ and the like.
Illustratively, the "mixing the polyimide acid solution and the alignment film additive to obtain the precursor solution" may specifically include:
and (3) uniformly mixing 50g of polyimide acid solution, 50g of ethylene glycol monobutyl ether and 0.5g of compound AD1 to obtain a precursor solution containing the compound AD1 (alignment film additive).
S200, please refer to fig. 2, providing a first substrate 10 and a second substrate 20, applying precursor solutions on both the first substrate 10 and the second substrate 20, curing the precursor solutions on the first substrate 10 and the second substrate 20, forming a first alignment film 31 on the first substrate 10, and forming a second alignment film 32 on the second substrate 20.
In some embodiments, the first substrate 10 is a CF (color filter) substrate, and the second substrate 20 is a TFT (thin film transistor) substrate; in some embodiments, the first substrate 10 is a TFT substrate and the second substrate 20 is a CF substrate.
Illustratively, a surface of one of the first substrate 10 and the second substrate 20 is provided with an ITO (indium tin oxide) electrode, and a surface of the other of the first substrate 10 and the second substrate 20 is not provided with an ITO electrode.
For example, the first and second substrates 10 and 20 may each have a square shape, and the first and second substrates 10 and 20 may each have a size of 10cm × 10cm.
For example, before the precursor solution on the first substrate 10 and the precursor solution on the second substrate 20 are cured, the first substrate 10 and the second substrate 20 may be baked at 70 ℃ to 90 ℃ (e.g., 70 ℃, 80 ℃, 90 ℃, etc.) for 3 minutes to 7 minutes (e.g., 3 minutes, 5 minutes, 7 minutes, etc.) to volatilize the solvent in the precursor solution on the first substrate 10 and the precursor solution on the second substrate 20.
Exemplarily, "curing the precursor solution on the first substrate 10 and the precursor solution on the second substrate 20" may specifically include:
performing first curing on the precursor solution on the first substrate 10 and the precursor solution on the second substrate 20 by using a heating method;
and performing secondary curing on the precursor solution on the first substrate 10 and the precursor solution on the second substrate 20 by using ultraviolet polarized light irradiation.
When the precursor solution on the first substrate 10 and the precursor solution on the second substrate 20 are irradiated with the ultraviolet polarized light, the ultraviolet polarized light may further polymerize the R group (polymerizable group) in the alignment layer additive, so as to achieve the second curing of the precursor solution, and further improve the compactness of the first alignment layer 31 and the second alignment layer 32, and the ultraviolet polarized light may also break the polyimide molecules aligned in the direction parallel to the polarization direction of the ultraviolet polarized light, for example, when the ultraviolet polarized light is the polarized light in the vertical direction, the polyimide molecules aligned in the vertical direction may break under the irradiation of the ultraviolet light, and the polyimide molecules aligned in the horizontal direction may not be affected, so that the polyimide molecules aligned in the horizontal direction remaining in the first alignment layer 31 and the second alignment layer 32 may guide the liquid crystal molecules in the liquid crystal material 40 to be aligned in the horizontal direction, so as to achieve the horizontal alignment.
Exemplarily, "performing the first curing of the precursor solution on the first substrate 10 and the precursor solution on the second substrate 20 by using a heating method" may specifically include: the first substrate 10 and the second substrate 20 are baked at 210 to 250 ℃ (e.g., 210, 220, 230, 240, 250 ℃, etc.) for 20 to 40 minutes (e.g., 20, 25, 30, 35, 40, etc.).
Exemplarily, the "performing the second curing of the precursor solution on the first substrate 10 and the precursor solution on the second substrate 20 by using the method of irradiating with the ultraviolet polarized light" may specifically include: irradiating the precursor solution on the first substrate 10 and the precursor solution on the second substrate 20 by using ultraviolet linear polarized light with the wavelength of 320nm, wherein the illumination intensity of the ultraviolet linear polarized light can be 200W/cm 2 The integrated light quantity is 550Mj/cm 2 。
Illustratively, the thickness of the first alignment film 31 and the thickness of the second alignment film 32 are both 80nm to 120nm, such as 80nm, 90nm, 100nm, 110nm, 120nm, and the like.
S300, please refer to fig. 2, the first substrate 10 and the second substrate 20 are aligned and combined, the first alignment film 31 is disposed on the first substrate 10 facing to the second substrate 20, and the second alignment film 32 is disposed on the second substrate 20 facing to the first substrate 10.
Exemplarily, "the first substrate 10 and the second substrate 20 are aligned and combined" may specifically include:
coating a sealant 50 on one surface of the first substrate 10 and the second substrate 20;
the first substrate 10 and the second substrate 20 are aligned and combined, the first substrate 10 and the second substrate 20 are connected by the sealant 50, and the first substrate 10, the second substrate 20 and the sealant together enclose an accommodating space for accommodating the liquid crystal material 40.
S400, with reference to fig. 2, a liquid crystal material 40 is disposed between the first substrate 10 and the second substrate 20, so as to obtain the liquid crystal display panel 100.
For example, the liquid crystal material 40 may be disposed between the first substrate 10 and the second substrate 20 by vacuum injecting liquid crystal.
Exemplarily, the liquid crystal display panel 100 may be a horizontally aligned liquid crystal display panel, that is, liquid crystal molecules in the liquid crystal display panel 100 are aligned in a plane parallel to the first substrate 10 and the second substrate 20.
The alignment layer additive, the alignment layer, the liquid crystal display panel and the method for manufacturing the liquid crystal display panel provided by the embodiment of the present application are described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. The alignment film additive is characterized in that the structural general formula of the alignment film additive is shown in the specification
Wherein n is 2 to 4;
a is cycloalkyl, phenyl or an ester group;
sp is H, - (CH) 2 ) m -、-(CH 2 ) m At least one of-CH 2 -is substituted by-O-, -S-, -CO-O-, -O-CO-, -O-CO-O-, -OCH 2 -、-CH 2 O-substituted radical, or- (CH) 2 ) m -is neutralized toOne less H atom is replaced by F and Cl, wherein m is 1-8;
b is-OH or-COOH;
r is a polymerizable group.
2. The additive for an alignment film according to claim 1, wherein R is t-butyl methacrylate or t-butyl acrylate.
3. The alignment film additive of claim 1, wherein the alignment film additive comprises at least one of compound AD1, compound AD2, compound AD3, compound AD4, compound AD5, compound AD6, compound AD7, compound AD8, compound AD9, compound AD10, compound AD11, compound AD 12; wherein,
the structural formula of the compound AD1 is
The structural formula of the compound AD2 is
The structural formula of the compound AD3 is
The structural formula of the compound AD4 is
The structural formula of the compound AD5 is
The structural formula of the compound AD6 is
The structural formula of the compound AD7 is
The structural formula of the compound AD8 is
The structural formula of the compound AD9 is->
The structural formula of the compound AD10 is
The structural formula of the compound AD11 is
The structural formula of the compound AD12 is
4. An alignment film comprising a polyimide acid and the alignment film additive according to any one of claims 1 to 3 copolymerized.
5. The alignment film of claim 4, wherein the alignment film additive is present in an amount of 1wt% to 10wt%.
6. A liquid crystal display panel, comprising:
a first substrate;
a second substrate disposed opposite to the first substrate;
a liquid crystal material disposed between the first substrate and the second substrate;
a first alignment film on a side of the first substrate disposed toward the second substrate;
a second alignment film on a side of the second substrate disposed toward the first substrate;
wherein the first alignment film and/or the second alignment film are each copolymerized from a polyimidic acid and the alignment film additive of any of claims 1-3.
7. The liquid crystal display panel according to claim 6, wherein the thickness of the first alignment film and the thickness of the second alignment film are both 80nm to 120nm.
8. The liquid crystal display panel according to claim 6, wherein the content of the alignment layer additive in the first alignment layer is 1wt% to 10wt%, and the content of the alignment layer additive in the second alignment layer is 1wt% to 10wt%.
9. A method for manufacturing a liquid crystal display panel is characterized by comprising the following steps:
providing a polyimide acid solution and the alignment film additive of any one of claims 1-3, mixing the polyimide acid solution and the alignment film additive to obtain a precursor solution;
providing a first substrate and a second substrate, applying the precursor solution on the first substrate and the second substrate, curing the precursor solution on the first substrate and the precursor solution on the second substrate, forming a first alignment film on the first substrate, and forming a second alignment film on the second substrate;
aligning and combining the first substrate and the second substrate, wherein the first alignment film is positioned on one side of the first substrate, which is arranged towards the second substrate, and the second alignment film is positioned on one side of the second substrate, which is arranged towards the first substrate;
and arranging a liquid crystal material between the first substrate and the second substrate to obtain the liquid crystal display panel.
10. The method according to claim 9, wherein the curing the precursor solution on the first substrate and the precursor solution on the second substrate comprises:
heating the precursor solution on the first substrate and the precursor solution on the second substrate for the first time;
and carrying out secondary curing on the precursor solution on the first substrate and the precursor solution on the second substrate by adopting an ultraviolet polarized light irradiation method.
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