CN113451379B - Flexible display panel and flexible display device - Google Patents

Flexible display panel and flexible display device Download PDF

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Publication number
CN113451379B
CN113451379B CN202110721950.3A CN202110721950A CN113451379B CN 113451379 B CN113451379 B CN 113451379B CN 202110721950 A CN202110721950 A CN 202110721950A CN 113451379 B CN113451379 B CN 113451379B
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flexible display
display panel
disposed
traces
flexible substrate
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CN113451379A (en
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李骄阳
乔贵洲
袁波
卜凡中
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Kunshan New Flat Panel Display Technology Center Co Ltd
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Kunshan New Flat Panel Display Technology Center Co Ltd
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10OLED displays
    • H10K59/12Active-matrix OLED [AMOLED] displays
    • H10K59/131Interconnections, e.g. wiring lines or terminals
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30Indicating 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
    • G09F9/301Indicating 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The invention relates to the field of semiconductors and discloses a flexible display panel and a flexible display device. In the present invention, a flexible display panel includes: a flexible substrate, a plurality of pixel islands disposed over the flexible substrate and spaced apart from each other, and a plurality of stretchable connecting bridges connecting the plurality of pixel islands together; a light emitting pixel unit disposed on the pixel island; a plurality of routing lines arranged on each connecting bridge, wherein two ends of each routing line are respectively connected with two light-emitting pixel units which are respectively arranged on the two pixel islands; the multiple wires on each connecting bridge are arranged at intervals, and the multiple wires arranged on the same connecting bridge have the same wire routing function. Compared with the prior art, the flexible display panel and the flexible display device provided by the embodiment of the invention have the advantages of improving the stretching resistance and the electric interference resistance of the wiring.

Description

Flexible display panel and flexible display device
Technical Field
The invention relates to the field of semiconductors, in particular to a flexible display panel and a flexible display device.
Background
With the development of flexible Organic Light Emitting Diode (OLED) display technology, the consumer market of foldable and scroll display terminal products gradually releases and matures. The innovation of the folding display technology enables the wide-screen design directions of mobile phones, flat panels and notebook computers to be richer, and the display function and effect are more experienced compared with the liquid crystal display technology. On the basis of the flexible OLED display technology, the stretchable display technology will be the focus of research on the next generation display technology.
The stretchable display technology is essentially to realize the flexibility of the screen, and through the flexible design of the display back plate, namely a patterned design mode is adopted, the back plate material is hollowed out, the mechanical property of the material is changed, so that the display panel can be stretched and deformed in any direction on the basis of the original area, and stretchable and expandable display is realized. By the mode, diversified design of the display shape can be realized so as to adapt to multiple occasions and meet the use requirement of the environment. The stretchable display technology has wide application prospect in the technical fields of wearable, flexible medical equipment and vehicle-mounted display.
In order to facilitate tensile strain, an island-bridge structure is generated, that is, flexible Polyimide (PI) substrates are dispersed in an island shape, the Polyimide islands are connected by a ribbon-shaped connecting bridge (Hinge) region, wherein pixel circuits are distributed on the Polyimide islands, and metal routing lines among the pixel circuits are distributed on the ribbon-shaped connecting bridge region.
However, the inventor of the present invention finds that when the flexible display panel in the prior art is deformed, the wires are also deformed and twisted, which affects the electrical performance of the wires.
Disclosure of Invention
An object of the present invention is to provide a flexible display panel and a flexible display device, which can improve the stretch resistance and the electrical interference resistance of the trace.
In order to solve the above technical problems, an embodiment of the present invention provides a flexible display panel and a flexible display device, including: a flexible substrate, a plurality of pixel islands disposed over the flexible substrate and spaced apart from each other, and a plurality of stretchable connecting bridges connecting the plurality of pixel islands together; a light emitting pixel unit disposed on the pixel island; a plurality of routing lines arranged on each connecting bridge, wherein two ends of each routing line are respectively connected with two light-emitting pixel units which are respectively arranged on the two pixel islands; the multiple wires on each connecting bridge are arranged at intervals, and the multiple wires arranged on the same connecting bridge have the same wire routing function.
Embodiments of the present invention also provide a flexible display device including: such as the flexible display panel described above.
Preferably, the difference between the operating voltages of the plurality of traces disposed on the same connecting bridge is less than or equal to 2V. The difference between the working voltages of the multiple wires arranged on the same connecting bridge is smaller than or equal to 2V, the possibility that the multiple wires arranged on the same connecting bridge are directly subjected to electrical interference can be effectively avoided, and the anti-electrical interference capability of the wires is further improved.
Preferably, each pixel island includes a plurality of connection regions respectively connected to the plurality of connection bridges, a plurality of connection members respectively connected to the plurality of routing lines are disposed in each of the connection regions, and a difference between operating voltages of the plurality of connection members located in the same connection region is less than or equal to 2V. The difference between the working voltages of the connecting pieces in the same connecting area is smaller than or equal to 2V, so that the multiple wires in the same connecting bridge are connected with the connecting pieces in the same connecting area, the crossed arrangement of the wires caused by different positions of the connecting pieces when the multiple wires in the same connecting bridge are connected with the pixel island is avoided, and the electrical interference between the wires is further reduced.
Preferably, the spacing distance between the plurality of traces disposed on the same connecting bridge is less than or equal to 3 micrometers. The spacing distance between many walks on the same connecting bridge is less than or equal to 3 microns can effectually reduce the required width of connecting bridge that sets up many lines, is convenient for set up more connecting bridges.
Preferably, the connection bridge includes a plurality of routing layers stacked in a direction perpendicular to the flexible substrate and a spacing layer disposed between the plurality of routing layers, and the plurality of routing lines are disposed on the plurality of routing layers, respectively. Set up the multilayer routing layer on the flexible substrate for many walk the line and pile up the setting in the direction of perpendicular to flexible substrate, thereby further reduction sets up many width of walking the required connecting bridge of line, is more convenient for set up more connecting bridge structures.
Preferably, a plurality of mutually spaced connecting bridges are connected between at least two adjacent pixel islands, and a spacing distance between the connecting bridges between two adjacent pixel islands is greater than or equal to 3 micrometers. The distance between two adjacent connecting bridges is greater than or equal to 3 microns, so that the possibility of electrical interference between the wires in the two adjacent connecting bridges can be reduced, and the possibility of mutual impact between the adjacent connecting bridges in bending or stretching can be reduced.
Preferably, the connection bridge includes an organic layer disposed above the flexible substrate, and the plurality of traces are disposed on a surface of a side of the organic layer away from the flexible substrate. Be provided with the machine layer under walking the line, the thickness that the bridge can be connected in effectual increase to the setting on machine layer to connecting the ability that the bridge was anti buckling in thickness direction when promoting flexible display panel and being crooked or tensile, and then promoting to walk the ability that the line was anti buckling.
Preferably, the flexible printed circuit board further comprises an adhesive layer adhered to the surface of the side, away from the flexible substrate, of the organic layer, and the adhesive layer is adhered to the plurality of routing lines. Set up the adhesive linkage and respectively with organic layer and walk the line bonding setting, can promote organic layer and walk the joint strength between the line, reduce organic layer and walk the possibility that takes place to break away from between the line.
Preferably, the connection bridge further includes an inorganic encapsulation layer disposed on a surface of one side of the plurality of traces away from the flexible substrate. Set up inorganic encapsulation layer and cover many simultaneously and walk the line to the width of the inorganic encapsulation layer on the line is walked in the increase, promotes the stretch-proofing performance of inorganic encapsulation layer, reduces inorganic encapsulation layer fracture's possibility, promotes the stability of connecting the bridge.
Compared with the prior art, the display panel has the advantages that the multiple wires are arranged on the same connecting bridge, so that when the display panel deforms, the multiple wires on the same connecting bridge deform simultaneously, the overall rigidity is higher, the single wire can be better prevented from being broken, and the tensile resistance of the flexible display panel is improved. In addition, the deformation of the plurality of wires on the same connecting bridge is the same, so that the possibility of generating electrical interference due to too close distance between the wires and even contact between the wires is reduced, and the capability of resisting the electrical interference between the wires is improved. In addition, the function of many walking the lines on the same connecting bridge is the same for many walking the lines on the same connecting bridge produce the required distance of electrical interference between being closer, be more difficult to promptly because deformation produces electrical interference, further promotion walks the ability of anti electrical interference between the line.
Drawings
Fig. 1 is a schematic structural diagram of a flexible display panel according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a connection bridge in a flexible display panel according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a connection bridge in a flexible display panel according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The inventor of the present invention finds, through long-term research, that in the prior art, in order to further improve the stretch-resistant capability of the trace, a bridge structure connecting the islands mostly adopts a special-shaped trace (such as an S-shaped trace), but in order to improve the resolution, the pixel arrangement on the island is continuously increased, the number of the traces is correspondingly increased, space extrusion is caused, and the electrical property is affected by distortion when the traces deform.
In order to solve the technical problem, a first embodiment of the present invention relates to a flexible display panel, which is specifically configured as shown in fig. 1, and includes: a flexible substrate 10, a plurality of pixel islands 20 disposed above the flexible substrate 10 and spaced apart from each other, and a stretchable connection bridge 30 disposed above the flexible substrate 10 and connecting the plurality of pixel islands 20. The pixel island 20 and the connecting bridge 30 are arranged above the flexible substrate 10, that is, other film layer structures covering the flexible substrate 10 can be arranged on the flexible substrate 10, the pixel island 20 and the connecting bridge 30 are arranged on the other film layer structures, or the pixel island 20 and the connecting bridge 30 are directly arranged on the flexible substrate 10, and flexible arrangement can be specifically carried out according to actual needs. The pixel island 20 is provided with a light-emitting pixel unit 21, and it can be understood that a plurality of light-emitting pixel units 21 can be included on a single pixel island 20 as shown in fig. 1, or a single light-emitting pixel unit 21 can be provided on a single pixel island 20, when a plurality of light-emitting pixel units 21 are included on a single pixel island 20, the plurality of light-emitting pixel units 21 are connected with each other, so as to realize the interconnection between all light-emitting pixel units 21 on the whole flexible display panel; each connecting bridge 30 is provided with a plurality of wires 31, two ends of each wire 31 are respectively connected with two light-emitting pixel units 21, and the two light-emitting pixel units 21 are respectively arranged on two pixel islands 20. The plurality of wires 31 arranged on each connecting bridge 30 are arranged at intervals, and the plurality of wires 31 arranged on the same connecting bridge 30 have the same wire function. The same routing function among the plurality of traces 31 means that the signals transmitted among the plurality of traces 31 are the same, for example, the plurality of traces 31 on the same connecting bridge 30 are all signal lines (Vdata, etc.), or all power lines (VDD and VSS, etc.), or all scan lines, etc., which are not listed here.
Compared with the prior art, the flexible display panel provided by the first embodiment of the invention has the advantages that the plurality of wires 31 are arranged on the same connecting bridge 30, so that when the display panel deforms, the plurality of wires 31 on the same connecting bridge 30 deform simultaneously, the overall rigidity is stronger, the single wire 31 can be better prevented from being broken, and the tensile resistance of the flexible display panel is improved. In addition, the deformation of the plurality of traces 31 on the same connecting bridge 30 is the same, so that the possibility of electrical interference caused by too close distance between the traces 31 or even contact between the traces 31 is reduced, and the electrical interference resistance between the traces 31 is improved. In addition, the routing functions of the plurality of traces 31 on the same connecting bridge 30 are the same, so that the distance required for generating electrical interference between the plurality of traces 31 on the same connecting bridge 30 is shorter, that is, the electrical interference is not easily generated due to deformation, and the electrical interference resistance between the traces 31 is further improved.
Preferably, in the present embodiment, the spacing distance between the plurality of traces 31 disposed on the same connecting bridge 30 is less than or equal to 3 micrometers. The spacing distance between the plurality of wires 31 on the same connecting bridge 30 is less than or equal to 3 microns, so that the width required by the connecting bridge 30 for arranging the plurality of wires 31 can be effectively reduced, and more connecting bridges 30 can be conveniently arranged.
Preferably, in the present embodiment, a plurality of mutually spaced connection bridges 30 are connected between two adjacent pixel islands 20, and a spacing distance between the plurality of connection bridges 30 between two adjacent pixel islands 20 is greater than or equal to 3 micrometers. The spacing distance between two adjacent connecting bridges 30 is greater than or equal to 3 micrometers, so that the possibility of electrical interference between the wires in the two adjacent connecting bridges 30 can be reduced, and the possibility of mutual impact between the adjacent connecting bridges 30 when the flexible display panel is bent or stretched can also be reduced.
Preferably, in the present embodiment, the difference between the operating voltages of the plurality of traces 31 on the same connecting bridge 30 is less than or equal to 2V. The difference between the working voltages of the multiple wires 31 arranged on the same connecting bridge 30 is less than or equal to 2V, so that the possibility that the multiple wires 31 arranged on the same connecting bridge 30 directly generate electrical interference can be effectively avoided, and the anti-electrical interference capability of the wires 31 is further improved.
Preferably, in the present embodiment, each pixel island 20 includes a plurality of connection regions 22 connected to the plurality of connection bridges 30, respectively, a plurality of connection members 23 for connecting to the plurality of traces 31 are disposed in each connection region 22, and a difference between operating voltages of the plurality of connection members 23 located in the same connection region 22 is less than or equal to 2V. The difference between the working voltages of the plurality of connecting pieces 23 arranged in the same connecting area 22 is less than or equal to 2V, so that the plurality of wires 31 on the same connecting bridge 30 are connected with the plurality of connecting pieces 23 in the same connecting area 22, and the crossed arrangement of the wires caused by different positions of the connecting pieces 23 when the plurality of wires 31 on the same connecting bridge 30 are connected with the pixel island 20 is avoided, and the electrical interference between the wires 31 is further reduced.
Preferably, in this embodiment, as shown in fig. 2, the connection bridge 30 includes a plurality of routing layers 32 stacked in a direction perpendicular to the flexible substrate 10 (AA' direction in fig. 2) and a spacer layer 33 disposed between the plurality of routing layers 32, and the plurality of traces 31 are disposed on the plurality of routing layers 32, respectively. The multilayer wiring layer 32 is arranged on the flexible substrate 10, so that the plurality of wirings 31 are stacked in the direction perpendicular to the flexible substrate 10, the width of the connecting bridges 30 required by the plurality of wirings 31 is further reduced, and more connecting bridge 30 structures can be conveniently arranged. It is understood that a spacing layer 33 may be disposed on the side of the routing layer 32 close to the flexible substrate 10, which may be implemented according to practical situations and is not limited herein. It can be understood that, in fig. 2, a plurality of wires 31 are disposed on each wiring layer 32, and in other possible embodiments, one wire 31 may be disposed on each wiring layer 32, so as to further reduce the width of the connecting bridge 30 required by the plurality of wires 31, facilitate the arrangement of more connecting bridges 30, and further avoid the wires 31 from being broken when being bent. It will be appreciated that the arrangement of the routing layer 32 provides support for the plurality of traces 31, and the spacer layer 33 protects the plurality of traces 31 from damage.
A second embodiment of the present invention relates to a flexible display panel. The second embodiment is substantially the same as the first embodiment, and mainly differs therefrom in that: as shown in fig. 3, in the second embodiment of the present invention, the connecting bridge 30 further includes an organic layer 34 (e.g., a pimlar glue or polydimethylsiloxane) disposed above the flexible substrate 10, and the plurality of traces 31 are disposed on a surface of the organic layer 34 away from the flexible substrate 10. It is understood that the organic layer 34 is disposed above the flexible substrate 10, that is, other film structures covering the flexible substrate 10 may be disposed between the organic layer 34 and the flexible substrate 10, and the organic layer 34 is disposed on other film structures, or the organic layer 34 may be directly disposed on the flexible substrate 10 as shown in fig. 3, and the arrangement may be flexible according to actual needs.
Compared with the prior art, the flexible display panel provided by the second embodiment of the invention maintains all technical effects of the first embodiment, and the organic layer 34 is arranged below the routing line 31, and the arrangement of the organic layer 34 can effectively increase the thickness of the connecting bridge 30, so that the bending resistance of the connecting bridge 30 in the thickness direction when the flexible display panel is bent or stretched is improved, and further the bending resistance of the routing line 30 is improved.
Preferably, in the present embodiment, the organic layer 34 further includes an adhesive layer 40 disposed on a surface of the organic layer 40 away from the flexible substrate 10, and the adhesive layer 40 is disposed to adhere to the plurality of traces 31. The adhesive layer 40 is arranged to be adhered to the organic layer 34 and the trace 31, so that the connection strength between the organic layer 34 and the trace 31 can be improved, and the possibility of separation between the organic layer 34 and the trace 31 can be reduced. It can be understood that the adhesive layer 40 may be prepared on the same layer as the trace 31 as shown in fig. 3, that is, the adhesive layer 40 connects the side of the trace 31 and the organic layer 34 at the same time, or the adhesive layer 40 may be disposed between the trace 31 and the flexible substrate 10, and particularly, the adhesive layer may be flexibly disposed according to actual needs.
Preferably, in the present embodiment, the connection bridge 30 further includes an inorganic encapsulation layer 35 disposed on a surface of the plurality of traces 31 away from the flexible substrate 10. The orthographic projection of the inorganic encapsulation layer 35 on the flexible substrate 10 covers the orthographic projection of the traces 31 on the flexible substrate 10, and it can be understood that the inorganic encapsulation layer 35 is a whole layer structure. Set up inorganic packaging layer 35 and cover many simultaneously and walk line 31 to the width of inorganic packaging layer 35 on the line 31 is walked in the increase, promotes the stretch-proofing performance of inorganic packaging layer 35, reduces the inorganic packaging layer 35 and takes place cracked possibility, promotes the stability of connecting bridge 30.
A third embodiment of the present invention relates to a flexible display device including the flexible display panel as provided in the previous embodiments.
Compared with the prior art, the flexible display panel provided by the foregoing embodiment is provided in the flexible display device provided by the third embodiment of the present invention, so that the technical effects of the foregoing embodiments are also provided, which are not listed here, and the flexible display panel can be flexibly provided according to actual needs.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (9)

1. A flexible display panel, comprising:
a flexible substrate, a plurality of pixel islands disposed over the flexible substrate and spaced apart from each other, and a plurality of stretchable connecting bridges connecting the plurality of pixel islands together;
a light emitting pixel unit disposed on the pixel island;
a plurality of routing lines arranged on each connecting bridge, wherein two ends of each routing line are respectively connected with two light-emitting pixel units which are respectively arranged on the two pixel islands;
the plurality of wires on each connecting bridge are arranged at intervals, and the transmission signal types of the plurality of wires arranged on the same connecting bridge are the same;
and a plurality of mutually-spaced connecting bridges are connected between at least two adjacent pixel islands, and the spacing distance between the connecting bridges between two adjacent pixel islands is greater than or equal to 3 micrometers.
2. The flexible display panel according to claim 1, wherein a difference between operating voltages of the traces disposed on the same connecting bridge is less than or equal to 2V.
3. The flexible display panel according to claim 2, wherein each of the pixel islands includes a plurality of connection regions respectively connected to the plurality of connection bridges, a plurality of connection members respectively connected to the plurality of traces are disposed in each of the connection regions, and a difference between operating voltages of the plurality of connection members located in the same connection region is less than or equal to 2V.
4. The flexible display panel according to claim 1, wherein a spacing distance between the plurality of traces disposed on the same connecting bridge is less than or equal to 3 μm.
5. The flexible display panel of claim 1, wherein the connection bridge comprises a plurality of routing layers stacked in a direction perpendicular to the flexible substrate and a spacing layer disposed between the plurality of routing layers, the plurality of traces being disposed on the plurality of routing layers, respectively.
6. The flexible display panel according to claim 1, wherein the connection bridge comprises an organic layer disposed above the flexible substrate, and the plurality of traces are disposed on a surface of the organic layer away from the flexible substrate.
7. The flexible display panel according to claim 6, further comprising an adhesive layer adhered to a surface of the organic layer on a side away from the flexible substrate, wherein the adhesive layer is adhered to the plurality of traces.
8. The flexible display panel of claim 6, wherein the connection bridge further comprises an inorganic encapsulation layer disposed on a surface of the plurality of traces away from the flexible substrate.
9. A flexible display device, comprising: the flexible display panel of any one of claims 1 to 8.
CN202110721950.3A 2021-06-28 2021-06-28 Flexible display panel and flexible display device Active CN113451379B (en)

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Publication number Priority date Publication date Assignee Title
CN113990193A (en) * 2021-10-29 2022-01-28 昆山工研院新型平板显示技术中心有限公司 Flexible display panel and flexible display screen
CN114220831B (en) * 2021-12-10 2023-12-01 武汉华星光电半导体显示技术有限公司 Stretchable display panel and manufacturing method thereof
CN116647975A (en) * 2022-02-15 2023-08-25 群创光电股份有限公司 electronic device
WO2023159498A1 (en) * 2022-02-25 2023-08-31 京东方科技集团股份有限公司 Display panel and manufacturing method therefor, and display device
CN114758582A (en) * 2022-05-17 2022-07-15 云谷(固安)科技有限公司 Display panel and manufacturing method thereof

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CN111710242A (en) * 2020-06-28 2020-09-25 合肥维信诺科技有限公司 Stretchable display screen and screen body protective film
CN112530864A (en) * 2020-11-30 2021-03-19 厦门天马微电子有限公司 Preparation method of stretchable display panel, stretchable display panel and display device

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CN111710242A (en) * 2020-06-28 2020-09-25 合肥维信诺科技有限公司 Stretchable display screen and screen body protective film
CN112530864A (en) * 2020-11-30 2021-03-19 厦门天马微电子有限公司 Preparation method of stretchable display panel, stretchable display panel and display device

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