CN109087587B - Flexible display substrate, preparation method thereof and display device - Google Patents
Flexible display substrate, preparation method thereof and display device Download PDFInfo
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- CN109087587B CN109087587B CN201810902033.3A CN201810902033A CN109087587B CN 109087587 B CN109087587 B CN 109087587B CN 201810902033 A CN201810902033 A CN 201810902033A CN 109087587 B CN109087587 B CN 109087587B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
Abstract
The invention relates to the field of display, in particular to a flexible display substrate, a preparation method thereof and a display device. The preparation method of the flexible display substrate comprises the following steps: providing a bearing substrate; forming a connecting layer on the bearing substrate, wherein the connecting layer is made of a high critical solution temperature type temperature-sensitive high polymer material; forming a flexible substrate on the connection layer; preparing a display device on the flexible substrate; and processing the connecting layer by using the temperature lower than the critical temperature of the high critical solution temperature type temperature-sensitive high polymer material, so that the adhesive force between the connecting layer and the flexible substrate is reduced, and the flexible substrate provided with the display device is peeled off from the bearing substrate provided with the connecting layer to obtain the flexible display substrate. The preparation method of the flexible display substrate can enable the flexible display substrate and the bearing substrate to be easily separated, the separation uniformity is good, the production efficiency is high, and the flexible display substrate is not damaged.
Description
Technical Field
The invention relates to the field of display, in particular to a flexible display substrate, a preparation method thereof and a display device.
Background
Flexible Display (Flexible Display) technology has developed rapidly in the last decade, and thus the Flexible Display has advanced greatly from the size of the screen to the quality of the Display. Flexible displays, also known as rollable displays, are display devices that are constructed of flexible materials to allow for the flexible panels to be viewed and deformed. Both the endangered CRT (Cathode Ray Tube) display and the LCD (Liquid crystal display) that is the mainstream nowadays are essentially conventional rigid displays. Compared to common rigid displays, flexible displays have a number of advantages: the shock resistance and the shock resistance are stronger; the weight is light, the volume is small, and the carrying is more convenient; and a roll-to-roll process similar to a newspaper printing process is adopted, so that the cost is lower, and the like.
The method of manufacturing a flexible display generally comprises the steps of: the flexible display substrate is manufactured by taking a bearing substrate with hardness as a support, adhering a flexible substrate on the bearing substrate, manufacturing an electronic element on the flexible substrate, finishing the manufacturing of the flexible display substrate, and finally peeling the bearing substrate from the flexible substrate.
The final peeling is difficult throughout the manufacturing process. Generally, laser stripping is adopted, namely, high-energy laser beams are utilized to scan the back of a display device, so that an adhesive between a bearing substrate and a flexible substrate is aged, the adhesive performance is reduced, and the bearing substrate and the flexible substrate are stripped. However, this method requires high-energy laser beam scanning, has low production efficiency and poor peeling uniformity, and is liable to adversely affect the performance and display effect of the flexible display substrate.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the preparation method of the flexible display substrate can enable the flexible display substrate and the bearing substrate to be easily separated, the separation uniformity is good, the production efficiency is high, and the flexible display substrate is not damaged.
The invention provides a preparation method of a flexible display substrate, which comprises the following steps:
providing a bearing substrate;
forming a connecting layer on the bearing substrate, wherein the connecting layer is made of a high critical solution temperature type temperature-sensitive high polymer material;
forming a flexible substrate on the connection layer;
preparing a display device on the flexible substrate;
and processing the connecting layer by using the temperature lower than the critical temperature of the high critical solution temperature type temperature-sensitive high polymer material, so that the adhesive force between the connecting layer and the flexible substrate is reduced, and the flexible substrate provided with the display device is peeled off from the bearing substrate provided with the connecting layer to obtain the flexible display substrate.
Preferably, the critical temperature of the high critical solution temperature type temperature-sensitive polymer material is-20 ℃ to 10 ℃.
Preferably, the high critical solution temperature type temperature sensitive polymer material is polystyrene-polyisoprene, polyoxyethylene-polyoxypropylene, polyisobutylene-polydimethylsiloxane, a copolymer of acryloyl glycinamide and acrylonitrile, or poly (dimethylaminopropyl methacrylamide) -b- [ poly (2-methoxyethoxy) ethyl methacrylate-co-polyethylene glycol methacrylate ].
Preferably, the thickness of the connecting layer is 0.5-5 microns.
Preferably, the forming of the connection layer on the carrier substrate specifically includes:
dissolving a high critical solution temperature type temperature-sensitive high polymer material in an organic solvent to form a solution;
and coating the solution on a bearing substrate, and drying and curing to form the connecting layer.
Preferably, the material of the flexible substrate is polyimide, polyethylene, polypropylene, polystyrene, polyethylene terephthalate or polyethylene naphthalate.
Preferably, the material of the carrier substrate is polyvinyl chloride, acrylic, glass or polyester.
Preferably, the connection layer comprises a plurality of independent sub-units arranged side by side, with gaps between the sub-units.
The invention provides a flexible display substrate which is manufactured by the manufacturing method in the technical scheme.
The invention also provides a display device which comprises the flexible display substrate in the technical scheme.
Compared with the prior art, the invention adopts a high critical solution temperature (UCST) type temperature-sensitive high polymer material as a connecting layer, the high polymer generally contains polar groups which can be associated, and at the high critical temperature, no association occurs in the molecular chain, and the molecules are in a stretching state; and when the temperature is lower than the critical temperature, intramolecular association or hydrogen bond association is formed. The polymer chain collapses and is compact together, so that the adhesive force between the connecting layer and the flexible substrate is reduced, the flexible substrate and the bearing substrate can be separated by adopting a physical method, the cost is low, the efficiency is high, and the flexible display substrate is not damaged. In addition, the separated connecting layer can be reused, and the production cost is reduced.
Drawings
Fig. 1 shows a flow chart of a process for manufacturing a flexible display substrate according to an embodiment of the invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention in conjunction with the following examples, but it will be understood that the description is intended to illustrate the features and advantages of the invention further, and not to limit the invention.
The embodiment of the invention discloses a preparation method of a flexible display substrate, which comprises the following steps, in particular to refer to FIG. 1:
providing a bearing substrate;
forming a connecting layer on the bearing substrate, wherein the connecting layer is made of a high critical solution temperature type temperature-sensitive high polymer material;
forming a flexible substrate on the connection layer;
preparing a display device on the flexible substrate;
and processing the connecting layer by using the temperature lower than the critical temperature of the high critical solution temperature type temperature-sensitive high polymer material, reducing the viscosity between the connecting layer and the flexible substrate, and stripping the flexible substrate with the display device from the bearing substrate with the connecting layer to obtain the flexible display substrate.
The temperature-sensitive polymer materials are mostly used in solution and are not applied to the display substrate in the prior art. The invention screens a plurality of materials, and finally selects a temperature-sensitive high polymer material with high critical solution temperature to prepare the connecting layer. The macromolecule generally contains polar groups capable of associating, and at a high temperature critical temperature, no association occurs in a molecular chain, and the molecule is in a stretching state; and when the temperature is lower than the critical temperature, intramolecular association or hydrogen bond association is formed. The polymer chain collapses and is compact together, so that the adhesive force between the connecting layer and the flexible substrate is reduced, the flexible substrate and the bearing substrate can be separated by adopting a physical method, the cost is low, the efficiency is high, and the flexible display substrate is not damaged.
The following describes in detail the method for manufacturing a flexible display substrate according to the present invention:
step S1: providing a bearing substrate;
the invention has no special requirements for the selection of the bearing substrate, and the bearing substrate has certain hardness and can play a supporting role. The material of the bearing substrate is preferably polyvinyl chloride, acrylic, glass or polyester.
Step S2: forming a connecting layer on the bearing substrate, wherein the connecting layer is made of a high critical solution temperature type temperature-sensitive high polymer material;
preferably, the forming of the connection layer on the carrier substrate specifically includes:
dissolving a high critical solution temperature type temperature-sensitive high polymer material in an organic solvent to form a solution;
and coating the solution on a bearing substrate, and drying and curing to form the connecting layer.
The tie layer needs to be matched to other structures as it is used in a display device, and the preparation of the tie layer cannot affect the performance of other structures. In the invention, the critical temperature of the high critical solution temperature type temperature-sensitive polymer material is preferably-20 ℃ to 10 ℃, and more preferably-10 ℃ to 10 ℃.
The high critical solution temperature type temperature sensitive polymer material is preferably polystyrene-polyisoprene, polyoxyethylene-polyoxypropylene, polyisobutylene-polydimethylsiloxane, a copolymer of acryloyl glycinamide and acrylonitrile, or polydimethylaminopropylmethacrylamide-b- [ poly (2-methoxyethoxy) ethyl methacrylate-co-polyethylene glycol methacrylate ].
In view of the adhesion of the connection layer and the convenience of peeling off the carrier substrate, it is preferable that the connection layer has a thickness of 0.5 to 5 μm.
The connecting layer can be a continuous film layer, and the surface area of the connecting layer is equal to that of the flexible substrate; or
Preferably, the connection layer comprises a plurality of independent sub-units arranged side by side, with gaps between the sub-units.
Step S3: forming a flexible substrate on the connection layer;
the material of the flexible substrate is preferably polyimide, polyethylene, polypropylene, polystyrene, polyethylene terephthalate or polyethylene naphthalate.
Step S4; and processing the connecting layer by using the temperature lower than the critical temperature of the high critical solution temperature type temperature-sensitive high polymer material, so that the adhesive force between the connecting layer and the flexible substrate is reduced, and the flexible substrate provided with the display device is peeled off from the bearing substrate provided with the connecting layer to obtain the flexible display substrate.
When the external temperature is lower than the critical temperature of the high critical solution temperature type temperature-sensitive polymer material, the polymer chains of the connecting layer collapse and are compacted together, so that the adhesion between the connecting layer and the flexible substrate is poor, and the flexible substrate can be easily separated from the bearing substrate on which the connecting layer is formed.
The embodiment of the invention discloses a flexible display substrate which is manufactured by adopting the manufacturing method of the technical scheme.
The invention also comprises a preset substrate which comprises a bearing substrate, a connecting layer and a flexible substrate, wherein the connecting layer is made of a high critical solution temperature type temperature-sensitive high polymer material.
And finally, processing the connecting layer by using the temperature lower than the critical temperature of the high critical solution temperature type temperature-sensitive high polymer material, and stripping the flexible substrate with the display device from the bearing substrate with the connecting layer to obtain the flexible display substrate.
The embodiment of the invention also discloses a display device which comprises the flexible display substrate in the technical scheme. The display device may be: the display device comprises a television, a display, a digital photo frame, a mobile phone, a tablet personal computer and any other product or component with a display function, wherein the display device further comprises a flexible circuit board, a printed circuit board and a back plate.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A preparation method of a flexible display substrate is characterized by comprising the following steps:
providing a bearing substrate;
forming a connecting layer on the bearing substrate, wherein the connecting layer is made of a high critical solution temperature type temperature-sensitive high polymer material;
forming a flexible substrate on the connection layer;
preparing a display device on the flexible substrate;
treating the connecting layer by using the temperature lower than the critical temperature of the high critical solution temperature type temperature-sensitive high polymer material, reducing the adhesive force between the connecting layer and the flexible substrate, and stripping the flexible substrate provided with the display device from the bearing substrate provided with the connecting layer to obtain a flexible display substrate;
the connection layer comprises a plurality of independent subunits arranged side by side, and gaps exist among the subunits.
2. The preparation method according to claim 1, wherein the critical temperature of the high critical solution temperature type temperature-sensitive polymer material is-20 ℃ to 10 ℃.
3. The method according to claim 1, wherein the high critical solution temperature type temperature sensitive polymer material is polystyrene-polyisoprene, polyethylene oxide-polypropylene oxide, polyisobutylene-polydimethylsiloxane, a copolymer of acryloyl glycinamide and acrylonitrile, or poly (dimethylaminopropyl methacrylamide) -b- [ poly (2-methoxyethoxy) ethyl methacrylate-co-polyethylene glycol methacrylate ].
4. The method of claim 1, wherein the tie layer has a thickness of 0.5 to 5 μm.
5. The method according to claim 1, wherein the forming of the connection layer on the carrier substrate is specifically:
dissolving a high critical solution temperature type temperature-sensitive high polymer material in an organic solvent to form a solution;
and coating the solution on a bearing substrate, and drying and curing to form the connecting layer.
6. The production method according to claim 1, wherein the material of the flexible substrate is polyimide, polyethylene, polypropylene, polystyrene, polyethylene terephthalate, or polyethylene naphthalate.
7. The method as claimed in claim 1, wherein the carrier substrate is made of polyvinyl chloride, acryl, glass or polyester.
8. A flexible display substrate, characterized in that it is manufactured by the method of any one of claims 1 to 7.
9. A display device comprising the flexible display substrate according to claim 8.
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| CN110071231B (en) * | 2019-06-13 | 2022-08-12 | 京东方科技集团股份有限公司 | Method for stabilizing PI substrate and preventing warping and manufacturing method of display panel |
| CN111530310B (en) * | 2020-04-30 | 2022-03-22 | 曲靖师范学院 | Preparation method of reversed-phase high-critical-dissolution-temperature type temperature-sensitive polyacrylonitrile separation membrane |
| CN111785672A (en) * | 2020-06-02 | 2020-10-16 | 芜湖长信科技股份有限公司 | Flexible touch screen separation method |
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| KR102108360B1 (en) * | 2013-06-19 | 2020-05-11 | 삼성디스플레이 주식회사 | Method for processing substrate and flexible display apparatus manufactured by using the method |
| CN103540269A (en) * | 2013-08-27 | 2014-01-29 | Tcl集团股份有限公司 | Preparation method of ultraviolet light reversible glue and flexible display device |
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