CN114656976A - Liquid crystal alignment agent, preparation method of liquid crystal alignment film and display panel - Google Patents
Liquid crystal alignment agent, preparation method of liquid crystal alignment film and display panel Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 152
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229920000642 polymer Polymers 0.000 claims abstract description 37
- 239000004642 Polyimide Substances 0.000 claims abstract description 33
- 229920001721 polyimide Polymers 0.000 claims abstract description 33
- 239000000126 substance Substances 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims description 104
- 239000000243 solution Substances 0.000 claims description 23
- 238000001035 drying Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 15
- 239000011259 mixed solution Substances 0.000 claims description 12
- 125000000217 alkyl group Chemical group 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 150000001924 cycloalkanes Chemical class 0.000 claims description 8
- YGYCECQIOXZODZ-UHFFFAOYSA-N 4415-87-6 Chemical compound O=C1OC(=O)C2C1C1C(=O)OC(=O)C12 YGYCECQIOXZODZ-UHFFFAOYSA-N 0.000 claims description 7
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims description 6
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 claims description 5
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 5
- 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 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 4
- 239000003153 chemical reaction reagent Substances 0.000 claims description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 4
- 125000005931 tert-butyloxycarbonyl group Chemical group [H]C([H])([H])C(OC(*)=O)(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 4
- 239000000565 sealant Substances 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 17
- 230000014759 maintenance of location Effects 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 87
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 4
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- 238000010438 heat treatment Methods 0.000 description 3
- 239000005264 High molar mass liquid crystal Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
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- 150000001335 aliphatic alkanes Chemical group 0.000 description 2
- 210000002858 crystal cell Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004528 spin coating Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/54—Additives having no specific mesophase characterised by their chemical composition
- C09K19/56—Aligning agents
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D257/00—Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms
- C07D257/02—Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms not condensed with other rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1042—Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1075—Partially aromatic polyimides
- C08G73/1078—Partially aromatic polyimides wholly aromatic in the diamino moiety
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/54—Additives having no specific mesophase characterised by their chemical composition
- C09K19/542—Macromolecular compounds
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
- G02F1/133723—Polyimide, polyamide-imide
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Abstract
The embodiment of the invention provides a liquid crystal alignment agent, a preparation method of a liquid crystal alignment film and a display panel. The liquid crystal alignment agent comprises at least one polyimide polymer, and the polyimide polymer has a chemical structural general formula provided in the embodiment of the invention. The liquid crystal alignment agent is added into the liquid crystal alignment film, and the liquid crystal layer in the display panel is aligned through the liquid crystal alignment film. Thereby effectively improving the adherence of the liquid crystal alignment film. And effectively improving the voltage retention rate and the alignment effect of the display panel.
Description
Technical Field
The invention relates to the technical field of display panels, in particular to a liquid crystal alignment agent, a preparation method of a liquid crystal alignment film and a display panel.
Background
With the development of display technologies such as display panel manufacturing process, people have raised higher requirements on the performance and quality of display panels and devices.
Liquid Crystal Displays (LCDs) are widely used in various display devices. In a liquid crystal display device, a liquid crystal layer is generally provided, and light is controlled by the liquid crystal layer. In the prior art, when the liquid crystal display is disposed, the liquid crystal layer is usually disposed between the array substrate and the color filter substrate, and a layer of thin film material is further disposed between the liquid crystal layer and the two substrates. The film material mainly functions to align liquid crystal molecules in a liquid crystal layer in a certain direction. We refer to as an alignment film. Among them, the liquid crystal alignment film is an important factor in the quality of liquid crystal display. In order to obtain uniform display characteristics of the lcd, the alignment film must be capable of uniformly aligning the liquid crystal molecules such that the liquid crystal molecules are uniformly aligned in one direction and form a pre-tilt angle with the substrate surface. In the prior art, when liquid crystal is aligned, a rubbing method is usually adopted for alignment, and a liquid crystal alignment film is rubbed by using a material such as a fiber along one direction to enable liquid crystal molecules to obtain alignment force.
In summary, when the liquid crystal alignment film prepared and formed in the prior art aligns liquid crystal, the alignment effect is not ideal, which is not favorable for further improving the comprehensive performance of the display panel.
Disclosure of Invention
The embodiment of the invention provides a liquid crystal alignment agent, a preparation method of a liquid crystal alignment film and a display panel. So as to effectively improve the alignment effect of the liquid crystal alignment film and improve the comprehensive performance of the display panel.
In order to solve the above technical problem, the technical method provided by the embodiment of the present invention is as follows:
in a first aspect of the embodiments of the present invention, a liquid crystal alignment agent is provided, which is applied to a liquid crystal alignment film of a display panel, and the liquid crystal alignment agent includes at least one polyimide polymer;
wherein the chemical structure general formula of the polyimide polymer is as follows:
wherein A is naphthenic hydrocarbon containing nitrogen atoms, R is straight-chain paraffinic hydrocarbon, and R' is paraffinic hydrocarbon containing-COOH or-OH.
According to an embodiment of the invention, said a comprises any one of the following cycloalkanes:
according to one embodiment of the invention, R is a straight chain alkyl group containing tert-butyloxycarbonyl group, and the structural formula of R is as follows:
according to an embodiment of the invention, said R and said R' are the same alkyl group.
According to an embodiment of the present invention, the chemical structural formula of the polyimide polymer corresponds to any one of the following structural formulas:
according to a second aspect of an embodiment of the present invention, there is also provided a method for manufacturing a liquid crystal alignment film, including the steps of:
adding 1, 2-bis (4-aminophenoxy) ethane and p-phenylenediamine into a reagent bottle to form a mixed solution;
adding an N-methyl pyrrolidone solvent into the mixed solution, adding cyclobutane tetracarboxylic dianhydride into the mixed solution, and reacting to obtain a polymer solution;
adding ethylene glycol monobutyl ether into the polymer solution, and adding a polyimide polymer into the polymer solution to obtain a liquid crystal alignment material, wherein the polyimide polymer is a liquid crystal alignment agent provided in the embodiment of the application;
providing two substrates, respectively coating the liquid crystal alignment materials on the substrates, drying to form a film, and combining the substrates into a box.
According to an embodiment of the present invention, the drying film-forming process includes the following steps:
baking at 80 deg.C for 3min-8min, increasing the temperature to 230 deg.C, and baking for 25min-35 min.
According to an embodiment of the present invention, the substrates include a first substrate and a second substrate, wherein a patterned ito film is disposed on a surface of the first substrate opposite to the second substrate, and the liquid crystal alignment material is coated on the first substrate and completely covers the ito film.
According to an embodiment of the present invention, after drying to form a film, the method further comprises the following steps:
and irradiating the substrates by adopting polarized ultraviolet rays, coating sealant on the surface of one substrate after irradiation is finished, and assembling the substrate with the other substrate.
According to a third aspect of the embodiments of the present invention, there is also provided a display panel including a first substrate, a second substrate, a liquid crystal layer disposed between the first substrate and the second substrate, and a liquid crystal alignment film;
the liquid crystal alignment film is arranged between the liquid crystal layer and the first substrate and the second substrate, and the liquid crystal alignment film is the liquid crystal alignment agent provided by the embodiment of the invention.
In summary, the embodiments of the present invention have the following beneficial effects:
the embodiment of the invention provides a liquid crystal alignment agent, a preparation method of a liquid crystal alignment film and a display panel. In the embodiment of the invention, the liquid crystal alignment agent is prepared and is applied to a liquid crystal alignment film of a display panel, the liquid crystal alignment agent comprises at least one polyimide polymer, and the polyimide polymer has a chemical structural general formula provided in the embodiment of the invention. The liquid crystal alignment agent is added into a liquid crystal alignment film, and a liquid crystal layer in the display panel is aligned through the liquid crystal alignment film. The liquid crystal alignment agent provided by the embodiment of the invention can effectively act on the liquid crystal alignment film and effectively improve the adherence of the liquid crystal alignment film. When the liquid crystal alignment film aligns the liquid crystal layer, the alignment film has good adherence, and in the alignment process, the voltage retention rate can be effectively improved, and the alignment effect and the comprehensive performance of the display panel are effectively improved.
Drawings
The technical solution and other advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for manufacturing a liquid crystal alignment film according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a film structure of a liquid crystal display panel according to an embodiment of the invention.
Detailed Description
The following disclosure provides different embodiments or examples to implement different structures of the present invention, which are shown in the drawings of the embodiments of the present invention. In order to simplify the present disclosure, specific example components and arrangements are described below. In addition, the present invention provides examples of various specific processes and materials, and one of ordinary skill in the art will recognize that other processes may be used. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of protection of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
With the continuous development of display panel preparation technology, people put higher demands on the quality and display effect of display panels.
Among them, in the preparation of the formed display panel, the liquid crystal alignment film is an important factor in the quality of liquid crystal display. In order to obtain uniform display characteristics of the display panel, the alignment film is required to be capable of uniformly aligning the liquid crystal molecules, uniformly aligning the aligned liquid crystal molecules in the same direction, and forming a certain pretilt angle, so as to effectively act on incident light and ensure the display effect of the display panel.
However, in the prior art, when the alignment film is prepared and used for aligning liquid crystal, the alignment film has a poor alignment effect on the liquid crystal and cannot act on liquid crystal molecules well, so that the comprehensive performance of the display panel is not utilized to be further improved.
The embodiment of the invention provides a liquid crystal alignment agent, a preparation method of an alignment film and a display panel, which are used for effectively improving the alignment effect of the alignment film in the display panel on liquid crystal and improving the comprehensive performance of the display panel.
The embodiment of the invention provides a liquid crystal alignment agent. Specifically, the liquid crystal alignment agent is applied to an alignment film. The liquid crystal alignment agent provided in the embodiment of the invention is added into the alignment film to improve the alignment capability of the alignment film of the display panel to liquid crystal.
Specifically, the liquid crystal alignment agent comprises at least one polyimide polymer, wherein the polyimide polymer has the following chemical structural general formula:
wherein A is a nitrogen atom-containing cycloalkane group, R is a straight-chain alkane group, and R' is an-COOH-or-OH-containing alkane group. The R group and the R' group connected on the branched chain of the A are connected through the chemical bond of the naphthenic base in the A, and form the chemical structural formula provided by the embodiment of the invention.
Further, the A is a nitrogen atom-containing cycloalkane group, and the cycloalkane group may include any one of the following cycloalkanes:
the cycloalkane has a different number of carbon atoms, and when combined with the R group and the R 'group, the-NH bond on the cycloalkane can combine with the corresponding R group and the R' group, and finally form the polyimide polymer.
Further, R provided in the examples of the present invention is a linear alkyl group. Specifically, the linear alkyl group may be a linear alkyl containing a tert-Butoxycarbonyl (BOC) group. When R is the straight-chain alkyl containing the tert-butoxycarbonyl group, the specific structure is as follows:
meanwhile, R' is alkyl containing-COOH or-OH. Preferably, in the embodiment of the present invention, the R' may also have the same chemical structure as R. When both are the same chemical structure, that is, R and R' are the same alkyl group.
Therefore, according to the different groups and the corresponding relationship thereof, the liquid crystal alignment agent provided by the embodiment of the invention is a polyimide polymer, and the chemical structural formula of the polyimide polymer comprises any one of the following structural formulas:
the polyimide polymer is a small molecular additive, and the small molecular additive is added into the alignment film to improve the alignment performance of the alignment film.
Specifically, the structural formula of the liquid crystal alignment agent contains a BOC group, the group contains tert-butyl, the tert-butyl is low in polarity, so that the alignment agent can be uniformly distributed in the whole alignment film and on the surface of the alignment film, the tert-butyl is easy to heat and leave, as shown in the following reaction formula, the tert-butyl is changed into-COOH after leaving, and the group can further react with acrylic resin in frame glue, so that the adhesion force of the liquid crystal alignment agent is improved.
Further, the embodiment of the invention also provides a preparation method of the liquid crystal alignment agent. The liquid crystal alignment agent is prepared by the method, and the liquid crystal alignment film is prepared by the liquid crystal alignment agent so as to effectively align the liquid crystal molecules of the display panel.
Specifically, as shown in fig. 1, fig. 1 is a schematic flow chart of a method for manufacturing a liquid crystal alignment film according to an embodiment of the present invention. The preparation process flow comprises the following steps:
s100: adding 1, 2-bis (4-aminophenoxy) ethane and p-phenylenediamine into a reagent bottle to form a mixed solution;
s101: adding an N-methyl pyrrolidone solvent into the mixed solution, adding cyclobutane tetracarboxylic dianhydride into the mixed solution, and reacting to obtain a polymer solution;
s102: adding ethylene glycol monobutyl ether into the polymer solution, and adding a polyimide polymer into the polymer solution to obtain a liquid crystal alignment material, wherein the polyimide polymer is the liquid crystal alignment agent provided by the embodiment of the invention;
s103: providing two substrates, respectively coating the liquid crystal alignment materials on the substrates, drying to form a film, and combining the substrates into a box.
In the embodiment of the present invention, a reaction reagent bottle is prepared, for example, a three-neck flask is provided. Adding 1, 2-bis (4-aminophenoxy) ethane into the three-neck flask, continuously adding p-phenylenediamine into the three-neck flask, and continuously adding N-methylpyrrolidone (NMP) solvent into the three-neck flask to fully dissolve the substances.
Specifically, the mass of the 1, 2-bis (4-aminophenoxy) ethane was 6.1072g, and the mass of the p-phenylenediamine was 2.7035 g. Meanwhile, the amount of the N-methylpyrrolidone (NMP) solvent added was 133 mL. The above-mentioned materials were added in the above-mentioned amounts and completely dissolved.
After the solution is sufficiently dissolved, cyclobutane tetracarboxylic dianhydride is added to the mixed solution, and the cyclobutane tetracarboxylic dianhydride reacts with other substances in the mixed solution. And a polymer solution was obtained. In the embodiment of the invention, the polymer solution is polyimide acid.
Specifically, in the examples of the present invention, the mass of the cyclobutanetetracarboxylic dianhydride added was 9.8055g, and the cyclobutanetetracarboxylic dianhydride was reacted at room temperature for 24 hours until the reaction between the substances in the mixed solution was complete. Specifically, the corresponding reaction process is as follows:
further, ethylene glycol monobutyl ether was continuously added to the above polyimide acid solution, and at the same time, the polyimide polymer M provided in the example of the present invention was added.
In the examples of the present invention, the polyimide polymer M is
The description is given for the sake of example.
The polyimide polymer M may also be other substances provided in the embodiments of the present invention, and details thereof are not repeated here. The principle is the same as that of the substance.
Meanwhile, when the addition is performed, a certain amount of the polyimide acid solution is taken, and preferably, 50g of the polyimide acid solution is taken, the mass of the added ethylene glycol monobutyl ether is 50g, and the mass of the added polyimide polymer M is 0.5 g. And finally obtaining the polyimide alignment solution containing the liquid crystal alignment agent alignment material provided by the embodiment of the invention after the full reaction.
And after the polyimide alignment solution is prepared, preparing and forming a liquid crystal alignment film layer by using the alignment solution. Specifically, two substrates are provided. In the embodiments of the present invention, the substrate is described by taking the first substrate and the second substrate as an example.
The first substrate is provided with an indium tin oxide film layer, and the indium tin oxide film layer is arranged on one side of the first substrate in a patterned manner, for example, the indium tin oxide film layer is arranged in a comb-tooth-shaped structure, or the indium tin oxide film layer is arranged in a patterned manner according to actual conditions. The arranged indium tin oxide film layer can form a voltage difference between the two substrates and acts on the alignment film layer to improve the alignment effect of the alignment film layer.
Specifically, the liquid crystal alignment material prepared above is coated on the first substrate. In an embodiment of the invention, the size of the first substrate may be 10cm by 10 cm. In the coating, a spin coating process may be used to form a coating film layer having a uniform thickness on the surface of the first substrate. After the coating is completed, the first substrate is subjected to a drying process.
At the same time, a coating is also applied to the surface of the second substrate, which is opposite to the coated surface of the first substrate, in order to later assemble the cartridge. In the embodiment of the invention, the surface of the second substrate is not provided with the indium tin oxide film layer, and the coating surface of the second substrate is a flat surface, so that the polyimide alignment solution is uniformly distributed at all positions of the spin-coated surface in the spin-coating process, and the alignment film formed in the subsequent preparation has the same thickness at all positions. Therefore, the liquid crystal alignment method and the liquid crystal alignment device can ensure that the liquid crystal alignment of the display panel can be well consistent.
And after the first substrate and the second substrate are coated, drying the first substrate and the second substrate. Specifically, both the first substrate and the second substrate may be transferred to a certain temperature to be heated. Preferably, the first substrate and the second substrate are transferred to 70 ℃ to 85 ℃ for heating, such as transferring the first substrate and the second substrate to 80 ℃ for drying treatment, and baking at the temperature for 3min to 8 min. Preferably, the first substrate and the second substrate may be both baked for 5 min. Further, the baking temperature and the baking time duration of the substrates with different sizes may be specifically set according to the sizes of the first substrate and the second substrate, which is not specifically limited herein.
And after the first substrate and the second substrate are processed under the temperature condition, carrying out secondary processing on the first substrate and the second substrate. Because the temperature of the first drying treatment is low, the low temperature cannot effectively dry the polymer liquid crystal alignment solution into a film completely, or the drying film-forming effect is not ideal. Therefore, it is necessary to perform a drying process again.
Specifically, the first substrate and the second substrate are transferred to a higher temperature to continue the drying process. At this time, the first and second substrates are transferred to 200 to 250 ℃, or the temperature is directly raised to 200 to 250 ℃ to dry the first and second substrates. Preferably, in the embodiment of the present invention, the heating temperature of the first substrate and the second substrate may be set to 230 ℃, and the heating and drying may be continued for 25min to 35min under the set temperature condition.
Preferably, the above-mentioned drying process is only an example, and the first substrate and the second substrate may be dried in multiple steps, and the first substrate and the second substrate are dried under different temperature gradients, so as to improve the film forming effect of the polymer liquid crystal alignment solution, and finally dried to obtain a liquid crystal alignment film.
In the embodiment of the invention, the thickness of the prepared liquid crystal alignment film is 90nm-110 nm. Preferably, the thickness of the liquid crystal alignment film is set to 100 nm. Thereby ensuring the comprehensive performance of the liquid crystal alignment film.
Further, after the drying and film forming are completed, the liquid crystal alignment film needs to be further processed. Specifically, the first substrate and the second substrate are irradiated, for example, both the first substrate and the second substrate are irradiated with polarized ultraviolet rays. The intensity of the polarized ultraviolet ray was 200W/cm at the time of irradiation, the wavelength of the polarized ultraviolet ray was 320nm, and the integrated light amount corresponding to the polarized ultraviolet ray was 550 mJ.
Through the irradiation of the polarized ultraviolet rays, the liquid crystal alignment film can be effectively enabled to have better compactness and consistency. And after the irradiation is finished, the first substrate and the second substrate are paired to form a box. When the cell is assembled, the two sides on which the liquid crystal alignment films are formed are opposed. And encapsulating the first substrate and the second substrate.
During packaging, the frame sealing glue is coated on the peripheral edge of the first substrate, and the second substrate is attached to the frame sealing glue and sealed. Thereby forming the liquid crystal cell provided in the embodiment of the present invention, and finally injecting liquid crystal molecules into the liquid crystal cell under a vacuum condition.
Through the preparation process, the obtained liquid crystal alignment film has better adherence and adhesion. When the liquid crystal is aligned, the liquid crystal alignment film can effectively improve the retention rate of alignment voltage, so that the alignment effect of the liquid crystal in the display panel is improved.
Further, the embodiment of the invention also provides a display panel. As shown in fig. 2, fig. 2 is a schematic diagram of a film structure of a liquid crystal display panel according to an embodiment of the present invention. The display panel includes a first substrate 200, a second substrate 201, and a liquid crystal layer 204 disposed between the first substrate 200 and the second substrate 201.
The display panel further includes an ito film layer 202 disposed on the first substrate 200, a first liquid crystal alignment film 203 disposed on the ito film layer 202, and a second liquid crystal alignment film 205 disposed between the liquid crystal layer 204 and the second substrate 201. The first liquid crystal alignment film 203 and the second liquid crystal alignment film 205 are both provided with the liquid crystal alignment agent provided in the embodiment of the present invention. Therefore, the liquid crystal alignment film provided by the embodiment of the invention effectively improves the liquid crystal alignment effect of the display panel and improves the performance of the display panel.
Further, as shown in table 1 below, table 1 shows the alignment performance of the liquid crystal corresponding to different experimental groups.
Table 1: alignment Properties corresponding to different experimental groups
| Dark state effect | Alignment effect | VHR | Adhesion force | |
| Scheme 1 | Superior food | Superior food | 99％-99.5％ | 15N |
| Scheme 2 | Superior food | Superior food | 96％-98％ | 3N |
In the above experimental results, the scheme 1 is a display panel prepared by using the liquid crystal alignment film provided in the embodiment of the present invention, and the scheme 2 is a display panel not prepared by using the liquid crystal alignment film provided in the embodiment of the present invention, that is, the liquid crystal alignment agent provided in the embodiment of the present invention is not added to the liquid crystal alignment film in the scheme 2. And the other film layers in scheme 1 and scheme 2 are the same.
According to the experimental data, in the scheme 1 and the scheme 2, the display panels corresponding to different liquid crystal alignment films have better dark state effect and alignment effect, and the tilt angle uniformity after liquid crystal alignment is excellent. However, by measuring the Voltage Holding Ratio (VHR) corresponding to different liquid crystal alignment films and the adhesion force between the liquid crystal alignment films and the sealant, it can be seen that the VHR of scheme 1 can be maintained at 99% to 99.5% with a high level, while the VHR of scheme 2 is maintained at 96% to 98%. Meanwhile, the adhesive force corresponding to the liquid crystal alignment film in the embodiment of the invention is obviously larger than that of the liquid crystal alignment film in the scheme 2. Therefore, it can be seen from the above experimental data that the performance in scheme 1 is superior to that in scheme 2. Namely, the display panel prepared by the liquid crystal alignment film provided by the embodiment of the invention has better performance.
Further, the display panel provided in the embodiment of the present invention may be applied to any product or component having a display function, such as a mobile phone, a computer, electronic paper, a display, a notebook computer, and a digital photo frame, and the specific type of the product or component is not particularly limited.
The liquid crystal alignment agent, the preparation method of the alignment film and the display panel provided by the embodiment of the invention are described in detail above, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the above embodiment is only used to help understanding the technical scheme and the core idea of the invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention in its embodiments.
Claims (10)
1. The liquid crystal alignment agent is applied to a liquid crystal alignment film of a display panel, and is characterized by comprising at least one polyimide polymer;
wherein the chemical structure general formula of the polyimide polymer is as follows:
wherein A is naphthenic hydrocarbon containing nitrogen atoms, R is straight-chain paraffinic hydrocarbon, and R' is paraffinic hydrocarbon containing-COOH or-OH.
2. The liquid crystal aligning agent of claim 1, wherein A comprises any one of the following cycloalkanes:
3. the liquid crystal aligning agent of claim 1, wherein R is a straight-chain alkyl group containing tert-butoxycarbonyl group, and the structural formula of R is as follows:
4. the liquid crystal aligning agent according to claim 1, wherein R and R' are the same alkyl group.
5. The liquid crystal aligning agent according to claim 1, wherein the polyimide polymer has a corresponding chemical formula which is any one of the following formulae:
6. the preparation method of the liquid crystal alignment film is characterized by comprising the following steps:
adding 1, 2-bis (4-aminophenoxy) ethane and p-phenylenediamine into a reagent bottle to form a mixed solution;
adding an N-methyl pyrrolidone solvent into the mixed solution, adding cyclobutane tetracarboxylic dianhydride into the mixed solution, and reacting to obtain a polymer solution;
adding ethylene glycol monobutyl ether into the polymer solution, and adding a polyimide polymer into the polymer solution to obtain a liquid crystal alignment material, wherein the polyimide polymer is the liquid crystal alignment agent as claimed in any one of claims 1 to 5;
providing two substrates, respectively coating the liquid crystal alignment materials on the substrates, drying to form a film, and combining the substrates into a box.
7. The method according to claim 6, wherein the drying process comprises the following steps:
baking at 80 deg.C for 3min-8min, raising the temperature to 230 deg.C, and baking for 25min-35 min.
8. The method according to claim 6, wherein the substrates comprise a first substrate and a second substrate, wherein a patterned ITO film is disposed on a side of the first substrate opposite to the second substrate, and the liquid crystal alignment material is coated on the side of the first substrate on which the ITO film is disposed and completely covers the ITO film.
9. The method for preparing a liquid crystal alignment film according to claim 6, further comprising the following steps after drying to form a film:
and irradiating the substrates by adopting polarized ultraviolet rays, coating sealant on the surface of one substrate after irradiation is finished, and assembling the substrate with another substrate.
10. The display panel is characterized by comprising a first substrate, a second substrate, a liquid crystal layer arranged between the first substrate and the second substrate, and a liquid crystal alignment film;
wherein the liquid crystal alignment film is disposed between the liquid crystal layer and the first and second substrates, and the liquid crystal alignment film comprises the liquid crystal aligning agent as claimed in claims 1 to 5.
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| CN1148384A (en) * | 1994-04-14 | 1997-04-23 | 耐克麦德瑟鲁塔公司 | Chelant compounds |
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| CN104246591A (en) * | 2012-02-03 | 2014-12-24 | 日产化学工业株式会社 | Liquid crystal aligning agent, liquid crystal alignment film and liquid crystal display element |
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| CN104246591A (en) * | 2012-02-03 | 2014-12-24 | 日产化学工业株式会社 | Liquid crystal aligning agent, liquid crystal alignment film and liquid crystal display element |
| US20140024752A1 (en) * | 2012-07-17 | 2014-01-23 | Chi Mei Corporation | Liquid crystal alignment agent, and liquid crystal alignment film and liquid crystal display element formed from the liquid alignment agent |
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