CN117471772A - Alignment structure, preparation method thereof and display panel - Google Patents
Alignment structure, preparation method thereof and display panel Download PDFInfo
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- CN117471772A CN117471772A CN202310852707.4A CN202310852707A CN117471772A CN 117471772 A CN117471772 A CN 117471772A CN 202310852707 A CN202310852707 A CN 202310852707A CN 117471772 A CN117471772 A CN 117471772A
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- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000004642 Polyimide Substances 0.000 claims abstract description 23
- 229920001721 polyimide Polymers 0.000 claims abstract description 23
- 230000003993 interaction Effects 0.000 claims abstract description 7
- 239000000758 substrate Substances 0.000 claims description 68
- 239000004973 liquid crystal related substance Substances 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 15
- 229920000858 Cyclodextrin Polymers 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 9
- YZOUYRAONFXZSI-SBHWVFSVSA-N (1S,3R,5R,6R,8R,10R,11R,13R,15R,16R,18R,20R,21R,23R,25R,26R,28R,30R,31S,33R,35R,36R,37S,38R,39S,40R,41S,42R,43S,44R,45S,46R,47S,48R,49S)-5,10,15,20,25,30,35-heptakis(hydroxymethyl)-37,39,40,41,42,43,44,45,46,47,48,49-dodecamethoxy-2,4,7,9,12,14,17,19,22,24,27,29,32,34-tetradecaoxaoctacyclo[31.2.2.23,6.28,11.213,16.218,21.223,26.228,31]nonatetracontane-36,38-diol Chemical compound O([C@@H]([C@H]([C@@H]1OC)OC)O[C@H]2[C@@H](O)[C@@H]([C@@H](O[C@@H]3[C@@H](CO)O[C@@H]([C@H]([C@@H]3O)OC)O[C@@H]3[C@@H](CO)O[C@@H]([C@H]([C@@H]3OC)OC)O[C@@H]3[C@@H](CO)O[C@@H]([C@H]([C@@H]3OC)OC)O[C@@H]3[C@@H](CO)O[C@@H]([C@H]([C@@H]3OC)OC)O3)O[C@@H]2CO)OC)[C@H](CO)[C@H]1O[C@@H]1[C@@H](OC)[C@H](OC)[C@H]3[C@@H](CO)O1 YZOUYRAONFXZSI-SBHWVFSVSA-N 0.000 claims description 7
- HFHDHCJBZVLPGP-UHFFFAOYSA-N schardinger α-dextrin Chemical compound O1C(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(O)C2O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC2C(O)C(O)C1OC2CO HFHDHCJBZVLPGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 24
- 239000010408 film Substances 0.000 description 14
- 230000005684 electric field Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
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- 238000000576 coating method Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
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- 238000005411 Van der Waals force Methods 0.000 description 1
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- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
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- 239000007921 spray Substances 0.000 description 1
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- 238000002834 transmittance Methods 0.000 description 1
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Classifications
-
- 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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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
The application provides an alignment structure, a preparation method thereof and a display panel, wherein the alignment structure comprises a host molecule and a guest molecule which are subjected to host-guest interaction, the host molecule is provided with a cavity, the guest molecule comprises a polyimide chain segment, and the polyimide chain segment is embedded into the cavity of the host molecule. The assembled body assembled by embedding the guest molecules into the cavities of the host molecules has poor fluidity, so that the formation of capillary channels in liquid drops can be inhibited, the film quality of the formed film is uniform, and the problem of reliability of products is further improved.
Description
Technical Field
The application relates to the technical field of display, in particular to an alignment structure, a preparation method thereof and a display panel.
Background
Thin film transistor liquid crystal display (TFT-LCD), thin film transistor liquid crystal display, TFT-LCD) is a display technology applied to televisions, flat panel displays and projectors. The TFT-LCD can be regarded as a structure in which a layer of liquid crystal is sandwiched between two glass substrates, the upper glass substrate is a Color Filter (Color Filter), and the lower glass substrate has transistors embedded thereon. When current passes through the transistor, an electric field is changed, so that liquid crystal molecules deflect, the polarization of light is changed, and the polarizer is utilized to influence the brightness state of a Pixel (Pixel).
The common display mode is a TN/IPS/VA mode, FFS (Fringe Field Switching) technology is strictly one branch of the IPS display mode, and is a technology in which liquid crystal molecules between electrodes and directly above the electrodes can rotate on a plane parallel to a glass substrate by a fringe electric field generated between a pixel electrode and a common electrode on a TFT substrate. Compared with the IPS mode, the FFS mode has the advantages that the electrode spacing of the FFS is smaller, the electric field is stronger, the liquid crystal above the electrodes is easier to rotate relative to the IPS under the action of the fringe field, the FFS technology has higher transmittance, and the FFS mode is more obviously improved by matching with negative liquid crystal.
Liquid crystal display panels currently on the mainstream market can be classified into the following types according to the alignment manner of liquid crystals: vertical alignment (Vertical Alignment, VA), twisted Nematic (TN) or super Twisted Nematic (Super Twisted Nematic, STN), in-Plane Switching (IPS), fringe field Switching (Fringe Field Switching, FFS) types.
Among them, FFS type lcd panels have the advantages of high penetration and wide viewing angle, and have been widely used in medium and small-sized displays, especially mobile phone panels. The FFS type liquid crystal display panel is a panel in which Liquid Crystal (LC) molecules in a liquid crystal Cell (Cell) are rotated in a plane parallel to a substrate by a boundary electric field to generate an optical path difference, and a display effect is achieved by upper and lower polarizers. Therefore, in FFS type liquid crystal display panels, liquid crystal molecules are horizontally aligned, but when conventional alignment films are applied by an inkjet method, the film quality is uneven, which affects the reliability of the product.
Content of the application
The invention aims to provide an alignment structure, a preparation method thereof and a display panel, and aims to optimize a molecular structure of the alignment structure, inhibit capillary flow of solute, make a membrane uniform and further improve the reliability of a product.
In a first aspect, the present application provides an alignment structure comprising:
a host molecule having a cavity;
a guest molecule comprising a polyimide segment, said guest molecule undergoing a host guest interaction with said host molecule;
wherein the polyimide segment is embedded in the cavity of the host molecule.
In some embodiments, the host molecule comprises cyclodextrin.
In some embodiments, the cyclodextrin has a cavity diameter greater than or equal to 0.7 nanometers.
In some embodiments, the host molecule comprises methyl- β -cyclodextrin or a derivative thereof.
In some embodiments, the host molecule and the guest molecule are assembled into a rigid rod.
In some embodiments, the polyimide segment is a solute and the guest molecule further comprises a solvent.
In a second aspect, the present application provides a method for preparing an alignment structure in any one of the foregoing embodiments, where the method for preparing an alignment structure includes:
providing a host molecule and a guest molecule at room temperature;
carrying out ultrasonic blending on the host molecules and the guest molecules to obtain a blending solution;
providing a substrate, and spraying the blending solution on the substrate to obtain an alignment structure on the surface of the substrate.
In some embodiments, the time of ultrasonic blending is greater than or equal to 12 hours.
In a third aspect, the present application provides a display panel, the display panel comprising:
a first substrate and a second substrate disposed opposite to each other;
the alignment structure in any of the above embodiments, located on a side of the first substrate facing the second substrate, and a side of the second substrate facing the first substrate;
and liquid crystal molecules between the first and second substrates.
In some embodiments, the alignment structure is uniformly sprayed on the first and second substrates.
The application provides an alignment structure, a preparation method thereof and a display panel, wherein the alignment structure comprises a host molecule and a guest molecule which are subjected to host-guest interaction, the host molecule is provided with a cavity, the guest molecule comprises a polyimide chain segment, and the polyimide chain segment is embedded into the cavity of the host molecule. The assembled body assembled by embedding the guest molecules into the cavities of the host molecules has poor fluidity, so that the formation of capillary channels in liquid drops can be inhibited, the film quality of the formed film is uniform, and the problem of reliability of products is further improved.
Drawings
Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an alignment structure provided in some embodiments of the present application;
FIG. 2 is a schematic structural diagram of methyl- β -cyclodextrin provided in some embodiments of the present application;
FIG. 3 is a graph showing the effect of a polyimide solution provided in some embodiments of the present application after spraying;
fig. 4 is an effect diagram of an alignment structure after spraying provided in some embodiments of the present application;
fig. 5 is a schematic flow chart of a method for preparing an alignment structure according to some embodiments of the present disclosure;
fig. 6 is a schematic structural diagram of a display panel according to some embodiments of the present application.
Detailed Description
The technical solutions 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 will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an alignment structure according to some embodiments of the present disclosure. The alignment structure 10 may be applied to a liquid crystal display panel.
Alignment structure 10 includes a host molecule 11 and a guest molecule 12 that interact with each other, host molecule 11 having a cavity, guest molecule 12 including a polyimide segment, and the polyimide segment being embedded in the cavity of host molecule 11.
Specifically, the host molecule 11 has a truncated cone-like shape with a cavity in the middle, the guest molecule 12 has a rod shape with a thick middle and thin ends, the guest molecule 12 interacts with the host molecule 11 as a host, and the host molecule is inserted into the cavity of the host molecule 11 to form an assembly. As shown in fig. 1, the assembled body has a structure in which the middle is thick and the two ends are thin, and is formed into a rigid rod shape due to the rigidity of the main body molecule 11. Host-guest interaction refers to interaction forces between the host and the guest, including van der Waals forces, hydrogen bonding forces, and the like.
In some embodiments, the host molecule 11 comprises cyclodextrin.
In some embodiments, the cyclodextrin has a cavity diameter greater than or equal to 0.7 nanometers to accommodate polyimide segments.
In some embodiments, the host molecule 11 comprises methyl- β -cyclodextrin or a derivative thereof.
Referring to fig. 2, fig. 2 is a schematic diagram of a structure of methyl- β -cyclodextrin according to some embodiments of the present application.
Wherein the methyl group is attached to the C at position 2 and the methyl-beta-cyclodextrin comprises 7 repeating triads.
In some embodiments, guest molecule 12 includes a solute and a solvent, the solute being a polyimide segment.
Referring to fig. 3 and fig. 4, fig. 3 is an effect diagram of a polyimide solution after spraying according to some embodiments of the present application, and fig. 4 is an effect diagram of an alignment structure after spraying according to some embodiments of the present application.
As shown in fig. 3, the alignment layer is obtained by inkjet coating with a conventional polyimide solution 20, and during the spraying process, since the ejected droplets have a contact angle on the substrate T, i.e., the two sides are thin and the middle is thick, the solvent evaporation on the two sides is fast. Because of capillary flow in the liquid drop, solute continuously moves to two sides, so that a nonuniform membrane surface is formed, and the polyimide alignment layer is uneven in membrane quality, namely, the two sides are thick and the middle is thin. Impurities in the substrate T at the thin film easily enter the liquid crystal molecules above to form an internal electric field, and the external electric field is affected, thereby causing a reliability problem. In addition, the spray film forming mode has serious phase separation of solute and solution due to the continuous evaporation of solvent at two ends.
As shown in fig. 4, in which the structure of the alignment structure 10 is as shown in fig. 1, the fluidity of such an assembly is poor, and capillary flow of molecules can be suppressed during the preparation process, for example, during the inkjet coating process, so that the quality of the inkjet coated film can be made uniform, and the phase separation condition can be reduced. When the alignment structure 10 is applied to a liquid crystal display panel, the uniformity of the film can improve the ion blocking property, reduce the entry of impurities into liquid crystal molecules from a thinner portion of the film to form an internal electric field, and further reduce the influence on an external electric field, so as to improve the reliability of the product.
Referring to fig. 5, fig. 5 is a flow chart illustrating a method for preparing an alignment structure according to some embodiments of the present disclosure. The preparation method of the alignment structure is used to prepare the alignment structure 10 described above, and thus reference may be made to fig. 1, 2 and 4. The preparation method of the alignment structure 10 comprises the following steps S1-S3.
Step S1: a host molecule 11 and a guest molecule 12 at room temperature are provided.
Polyimide solutions are commercially available and are typically stored at-20 degrees celsius and allowed to warm to room temperature for de-icing.
Step S2: the host molecule 11 and the guest molecule 12 are ultrasonically blended to obtain a blended solution.
The host molecule 11, such as methyl- β -cyclodextrin, is added to the polyimide solution for ultrasonic blending for a period of time greater than or equal to 12 hours to provide a blended solution.
Step S3: providing a substrate T, and spraying the blending solution on the substrate to obtain an alignment structure 10 on the substrate.
Specifically, a first substrate and a second substrate may be provided, and the blending solution may be sprayed on opposite sides of the first substrate and the second substrate by using an inkjet coating method, so that the alignment structure 10 may be obtained on a side of the first substrate facing the second substrate, and the alignment structure 10 may be obtained on a side of the second substrate facing the first substrate.
Compared with spraying polyimide solution, when the blending solution is sprayed, the contact angle between the liquid drop and the substrate T can be reduced, and further the capillary flow of solute in the liquid drop is inhibited.
After the alignment structure 10 is formed, grooves may be formed on the surface of the alignment structure 10 using an alignment technique, which mainly includes two kinds of Rubbing alignment (Rubbing) and photo alignment. The specific method for friction alignment comprises the following steps: the method has the advantages that the grooves which are arranged in a certain direction are brushed and ground on the alignment film through the wool distribution roller, so that the liquid crystal molecules are aligned along the groove direction on the alignment film, the process is simple, and good photoelectric effect and thermal stability are shown after alignment. The method for optical alignment comprises the following steps: after a panel is formed by adding a photosensitive Monomer (RM) into a liquid crystal material, an electric field is applied to the panel to enable liquid crystal to rotate to a certain angle along with the driving direction of the electric field, and then Ultraviolet (UV) light is utilized to enable the RM in the liquid crystal material to generate polymerization reaction on the surface of an alignment film to generate polymer protrusions (polymer protrusions) so as to achieve an alignment effect.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a display panel according to some embodiments of the present application. The display panel 100 can be applied to various electronic devices, such as wearable devices, e.g., smart bracelets, smart watches, VR (Virtual Reality) devices, mobile phones, electronic books and newspapers, televisions, personal computers, foldable and rollable flexible display and lighting devices.
The display panel 100 includes a first substrate 101 and a second substrate 102 disposed opposite to each other, an alignment structure 103, and liquid crystal molecules 104. The alignment structure 103 is an alignment structure in any of the above embodiments, and the alignment structure 103 is located on a side of the first substrate 101 facing the second substrate 102, and on a side of the second substrate 102 facing the first substrate 101. The liquid crystal molecules 104 are located between the first substrate 101 and the second substrate 102.
Wherein the alignment structure 103 comprises a host molecule and a guest molecule, wherein host-guest interactions occur, the host molecule has a cavity, the guest molecule comprises a polyimide segment, and the polyimide segment is embedded in the cavity of the host molecule.
In some embodiments, the alignment structures 103 are uniformly sprayed on the first substrate 101 and the second substrate 102.
In some embodiments, the first substrate 101 may be an array substrate, and the second substrate 102 may be a color film substrate; or the second substrate 102 is an array substrate, and the first substrate 101 is a color film substrate.
The array substrate comprises a substrate, a buffer layer, an active layer, a first gate insulating layer, a first gate, a second gate insulating layer, a second gate, an interlayer dielectric layer, a source electrode and a drain electrode from bottom to top. The buffer layer is positioned on the substrate, the active layer is positioned on the buffer layer, and the first gate insulating layer is positioned on the buffer layer and covers the active layer. The first gate electrode is located on the first gate insulating layer, and the second gate insulating layer is located on the first gate insulating layer and covers the first gate electrode. The second grid electrode is positioned on the second grid insulating layer, and the interlayer dielectric layer is positioned on the second grid insulating layer and covers the second grid electrode. The source electrode and the drain electrode are positioned on the interlayer dielectric layer and connected with two ends of the active layer through the via hole.
The color film substrate may include a color resist layer, a light shielding layer, and a polarizer.
Taking a common TN panel as an example, the liquid crystal molecules 104 are aligned in the alignment structure 103 when no voltage is applied, i.e., the liquid crystal molecules 104 are parallel to the substrate and twisted by 90 °. When voltage is applied from the outside, the liquid crystal molecules 104 are not constrained by the alignment structure 103 and are perpendicular to the substrate, so that the liquid crystal molecules 104 can play a role in shielding light and control luminous flux.
In the display panel 100 provided in this embodiment of the present application, the alignment structures 103 may be uniformly formed on the surface of the substrate, and the alignment structures 103 may block impurities in the substrate from entering the liquid crystal molecules 104, and have better blocking performance, so that the reliability problem of the display panel 100 may be improved.
The above description of the embodiments is only for helping to understand the technical solution of the present application and its core ideas; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An alignment structure, characterized in that the alignment structure comprises:
a host molecule having a cavity;
a guest molecule comprising a polyimide segment, said guest molecule undergoing a host guest interaction with said host molecule;
wherein the polyimide segment is embedded in the cavity of the host molecule.
2. The alignment structure of claim 1, wherein the host molecule comprises cyclodextrin.
3. The alignment structure of claim 2, wherein the cyclodextrin has a cavity diameter of greater than or equal to 0.7 nm.
4. An alignment structure according to claim 2, wherein the host molecule comprises methyl- β -cyclodextrin or a derivative thereof.
5. The alignment structure of claim 1, wherein the host molecule and the guest molecule are assembled into a rigid rod shape.
6. The alignment structure of claim 1, wherein the polyimide segment is a solute and the guest molecule further comprises a solvent.
7. A method of preparing an alignment structure according to any one of claims 1 to 6, comprising:
providing a host molecule and a guest molecule at room temperature;
carrying out ultrasonic blending on the host molecules and the guest molecules to obtain a blending solution;
providing a substrate, and spraying the blending solution on the substrate to obtain an alignment structure on the surface of the substrate.
8. The method of preparing an alignment structure according to claim 7, wherein the time of ultrasonic blending is greater than or equal to 12 hours.
9. A display panel, the display panel comprising:
a first substrate and a second substrate disposed opposite to each other;
the alignment structure of any one of claims 1-6, located on a side of the first substrate facing the second substrate, and on a side of the second substrate facing the first substrate;
and liquid crystal molecules between the first and second substrates.
10. The display panel of claim 9, wherein the alignment structures are uniformly sprayed on the first and second substrates.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310852707.4A CN117471772A (en) | 2023-07-11 | 2023-07-11 | Alignment structure, preparation method thereof and display panel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310852707.4A CN117471772A (en) | 2023-07-11 | 2023-07-11 | Alignment structure, preparation method thereof and display panel |
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| CN117471772A true CN117471772A (en) | 2024-01-30 |
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