Display device and manufacturing process thereof

Abstract

The application relates to the technical field of display devices, and particularly discloses a display device and a preparation process thereof. The display device comprises a stretchable display film layer, a first elastic film layer, a second elastic film layer and a support structure, wherein the first elastic film layer and the second elastic film layer are arranged on the two sides of the stretchable display film layer respectively; the support structure is arranged between the stretchable display film layer and the first elastic film layer and / or between the stretchable display film layer and the second elastic film layer. When the first elastic film layer and the second elastic film layer drive the whole screen body to stretch, the friction between the first elastic film layer, the second elastic film layer and the stretchable display film layer is weakened or avoided, the stretchable display film layer is protected, and the stretch ratio of the display device is improved.

Description

Technical Field

[0001] This application relates to the field of display device technology, and in particular to a display device and its manufacturing process. Background Technology

[0002] With the continuous development of flexible display technology, the form of display screens has gradually evolved from fixed curvature to full flexibility, and will further develop to the point where the display screen can change accordingly with the shape of objects. This requires the display screen to have multi-directional stretching characteristics. However, the current structure of stretchable display screens has some problems that affect the stretching rate of the display screen and lead to defects after stretching. Summary of the Invention

[0003] Therefore, it is necessary to provide a display device and its manufacturing process to address the above problems.

[0004] According to a first aspect of the embodiments of this application, a display device is provided, comprising:

[0005] Stretchable display film;

[0006] The first elastic film layer and the second elastic film layer are respectively disposed on both sides of the stretchable display film layer;

[0007] A support structure is disposed between the stretchable display film layer and the first elastic film layer, and / or between the stretchable display film layer and the second elastic film layer.

[0008] In one embodiment, the stretchable display film layer includes a plurality of pixel islands and a plurality of stretch bridges, with adjacent pixel islands connected by the stretch bridges, and each pixel island including at least one pixel unit.

[0009] In one embodiment, the support structure is connected between the pixel island and the first elastic film layer, and between the pixel island and the second elastic film layer.

[0010] In one embodiment, each pixel island includes a first side and a second side opposite to each other, the second side is provided with the pixel unit, and the support structure includes a first support structure and a second support structure. The first support structure is connected between the first side and the first elastic film layer and is formed in the first elastic film layer, and the second support structure is connected between the second side and the second elastic film layer and is formed in the second side or the second elastic film layer.

[0011] Preferably, the support structure is provided between two adjacent pixel units of the same pixel island;

[0012] Preferably, the support structure on the same pixel island is spaced apart from the pixel unit.

[0013] In one embodiment, the connection between the first support structure and the first side is a mortise and tenon joint;

[0014] When the second support structure is formed on the second side, the connection between the second support structure and the second elastic membrane layer is a tenon and mortise connection; when the second support structure is formed on the second elastic membrane layer, the connection between the second support structure and the second side is a tenon and mortise connection.

[0015] In one embodiment, the cross-sectional shape of the support structure along a direction perpendicular to the support structure includes any one or more of the following: circular, I-shaped, cross-shaped, and funnel-shaped.

[0016] In one embodiment, the ultimate tensile length of the stretchable display film is greater than the ultimate tensile lengths of the first elastic film and the second elastic film.

[0017] In one embodiment, the height of the support structure is greater than 1 micrometer.

[0018] In one embodiment, the support structure is made of organic colloids or metals.

[0019] According to a second aspect of the embodiments of this application, a manufacturing process for a display device is provided, comprising:

[0020] The first elastic film layer and the second elastic film layer are pre-stretched to reach a pre-stretched state; the first elastic film layer and the second elastic film layer are connected to both sides of the stretchable display film layer, wherein a support structure is connected between the stretchable display film layer and the first elastic film layer and / or between the stretchable display film layer and the second elastic film layer, and the stretchable display film layer is in a natural contraction state.

[0021] Release the pre-stretch force applied to the first elastic membrane layer and the second elastic membrane layer, so that the first elastic membrane layer and the second elastic membrane layer return to their natural contraction state.

[0022] The display device provided in this embodiment has a support structure between the stretchable display film layer and the first elastic film layer and / or between the stretchable display film layer and the second elastic film layer. This allows the first elastic film layer and / or the second elastic film layer to maintain a distance from the stretchable display film layer. As a result, when the first elastic film layer and the second elastic film layer stretch the entire screen, the friction between the first elastic film layer, the second elastic film layer and the stretchable display film layer is reduced or avoided. On the one hand, this protects the stretchable display film layer from damage caused by friction during stretching. On the other hand, it also increases the stretching freedom of the first elastic film layer, the second elastic film layer and the stretchable display film layer, thereby improving the stretchability of the display device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of a display device provided in another embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the assembly of a display device provided in one embodiment of this application;

[0026] Figure 4 This is an assembly diagram of a display device provided in another embodiment of this application;

[0027] Figure 5 Here are cross-sectional schematic diagrams of four types of mortise and tenon structures;

[0028] Figure 6 This is a flowchart illustrating the manufacturing process of a display device provided in an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100. Stretchable display film; 110. Pixel island; 120. Stretch bridge; 130. Pixel unit;

[0031] 200. First elastic membrane layer;

[0032] 300. Second elastic film layer;

[0033] 400, Support structure; 410, Support column; 420, First support structure; 430, Second support structure. Detailed Implementation

[0034] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] With the continuous development of flexible display technology, the evolution of display screen forms has gradually progressed from fixed to bent to flexed to fully flexible, and will further develop into 3D conformal / fitted displays, where the display screen can change shape accordingly to adapt to the shape of an object. This requires the display screen to possess multi-directional stretching properties similar to natural rubber. Currently, stretchable displays are gradually being used in wearable electronic products, electronic skin, non-planar or spherical object surfaces, and shock-resistant products, and represent one of the important development directions for next-generation display technology.

[0039] Current stretchable displays typically consist of pixel islands and stretch bridges. Adjacent pixel islands are connected by stretch bridges, and the pixel islands support the display components. Additionally, an elastic film layer is attached to the screen surface to enable stretching. However, when the elastic film layer stretches the entire screen, the stretch bridges and pixel islands experience significant friction with the elastic film layer. This makes the pixel islands and stretch bridges highly susceptible to damage, and the friction also affects the stretchability of the display.

[0040] To address the aforementioned problems, this application provides a display device and its manufacturing process.

[0041] In one embodiment, a display device is provided that has good tensile properties and does not damage the internal structure during the stretching process.

[0042] Reference Figure 1 The display device provided in this embodiment includes a stretchable display film layer 100, a first elastic film layer 200, a second elastic film layer 300, and a support structure 400.

[0043] The stretchable display film layer 100 includes a plurality of pixel islands 110 and a plurality of stretch bridges 120. The pixel islands 110 are spaced apart, and adjacent pixel islands 110 are connected by stretch bridges 120. Each pixel island 110 includes at least one pixel unit 130. A first elastic film layer 200 and a second elastic film layer 300 are respectively disposed on both sides of the stretchable display film layer 100. A support structure 400 is disposed between the stretchable display film layer 100 and the first elastic film layer 200 and / or between the stretchable display film layer 100 and the second elastic film layer 300.

[0044] The display device provided in this embodiment has a support structure 400 between the stretchable display film layer 100 and the first elastic film layer 200 and / or between the stretchable display film layer 100 and the second elastic film layer 300. This allows the first elastic film layer 200 and / or the second elastic film layer 300 to maintain a distance from the stretchable display film layer 100. Thus, when the first elastic film layer 200 and the second elastic film layer 300 stretch the entire screen, the friction between the first elastic film layer 200, the second elastic film layer 300 and the stretchable display film layer 100 can be reduced or avoided. On the one hand, this protects the stretchable display film layer 100 from damage caused by friction during stretching. On the other hand, it also increases the stretching freedom of the first elastic film layer 200, the second elastic film layer 300 and the stretchable display film layer 100, thereby improving the stretchability of the display device.

[0045] In this embodiment, the support structure 400 may be disposed only between the stretchable display film layer 100 and the first elastic film layer 200, or only between the stretchable display film layer 100 and the second elastic film layer 300, or simultaneously between the stretchable display film layer 100 and the first elastic film layer 200 and the stretchable display film layer 100 and the second elastic film layer 300. (Refer to...) Figure 2 When the support structure 400 is only disposed on one side of the stretchable display film layer 100 ( Figure 2 In this design, a support structure 400 (specifically a second support structure 430) is provided only between the stretchable display film layer 100 and the second elastic film layer 300. The elastic film layer on the other side of the stretchable display film layer 100 can be connected to the stretchable display film layer 100 by adhesive bonding.

[0046] In a preferred embodiment, support structures 400 are connected between the stretchable display film layer 100 and the first elastic film layer 200, and between the stretchable display film layer 100 and the second elastic film layer 300. That is, both sides of the stretchable display film layer 100 are connected to the corresponding elastic film layer via the support structures 400, and neither side of the stretchable display film layer 100 directly contacts the corresponding elastic film layer. Therefore, when the screen is stretched or released, during the outward extension or natural contraction of the first elastic film layer 200 and the second elastic film layer 300, neither side of the stretchable display film layer 100 is subjected to friction from the elastic film layer, thus preventing damage to the film structure in the pixel island 110 and the stretching bridge 120. Simultaneously, since the first elastic film layer 200, the second elastic film layer 300, and the stretching bridge 120 are less susceptible to friction during stretching or contraction, they have greater freedom of movement, which is beneficial for improving the stretchability of the display device.

[0047] Specifically, the support structure 400 is connected between the pixel island 110 and the first elastic film layer 200, and between the pixel island 110 and the second elastic film layer 300.

[0048] Each pixel island 110 includes a first side and a second side, with a pixel unit 130 disposed on the second side. The support structure 400 includes a first support structure 420 and a second support structure 430. The first support structure 420 is connected between the first side and the first elastic film layer 200 and is formed on the first elastic film layer 200. The second support structure 430 is connected between the second side and the second elastic film layer 300 and is formed on the second side or the second elastic film layer 300.

[0049] Each pixel island 110 may include a substrate, a driving layer, and a display layer. The driving layer is used to drive the display layer to emit light for display. The first side of the pixel island 110 is the substrate side, and the second side of the pixel island 110 is the display layer side. (Refer to...) Figure 3 and Figure 4 The support structure 400 near the first side (i.e., the first support structure 420) can be fabricated on the corresponding first elastic film layer 200, and the support structure 400 near the second side (i.e., the second support structure 430) can be fabricated on the pixel island 110 or the corresponding second elastic film layer 300. When the support structure 400 near the second side is fabricated on the pixel island 110, it can be fabricated simultaneously with the corresponding structure of the pixel island 110. For example, when fabricating the SPC film layer in the driving layer of the pixel island 110, the support structure can be fabricated simultaneously.

[0050] When the support structure 400 is formed on the first elastic film layer 200 or the second elastic film layer 300, the suspended end of the support structure 400 can be connected to the corresponding pixel island 110 during the assembly process. When the support structure 400 is formed on the pixel island 110, the suspended end of the support structure 400 can be connected to the corresponding elastic film layer during the assembly process.

[0051] Preferably, a support structure is provided between two adjacent pixel units 130 of the same pixel island 110.

[0052] Preferably, the support structure 400 on the same pixel island 110 is spaced apart from the pixel unit 130.

[0053] For example, the pixel island 110 may include three pixel units 130, namely a red light pixel unit, a green light pixel unit and a blue light pixel unit. The area where each pixel unit is located is a light-emitting area. The support structure can be set to avoid the light-emitting area. That is, the support structure 440 on the same pixel island 110 is set at intervals from the pixel unit 130 to avoid affecting the light-emitting performance.

[0054] In one embodiment, the connection between the first support structure 420 and the first side of the pixel island is a tenon-and-mortise connection; when the second support structure 430 is formed on the second side of the pixel island, the connection between the second support structure 430 and the second elastic film layer is a tenon-and-mortise connection; when the second support structure 430 is formed on the second elastic film layer, the connection between the second support structure 430 and the second side is a tenon-and-mortise connection.

[0055] The mortise and tenon joints improve the stability of the connection between the supporting structure and other structures, increase the 2D spatial bonding force, and avoid the risk of the elastic membrane layer peeling against the pixel islands during stretching.

[0056] In one embodiment, the support structure 400 includes a plurality of support columns 410, the two ends of which can be connected to a rigid island and a corresponding elastic film layer, respectively. The positions of the support columns 410 on both sides of the stretchable display film layer 100 can be symmetrically arranged about the plane on which the stretchable display film layer 100 is located. That is, the projection positions of the support columns 410 on both sides of the stretchable display film layer 100 are consistent, thereby ensuring the overall stability of the support structure 400.

[0057] In this embodiment, along the direction perpendicular to the support structure, the cross-sectional shape of the support structure includes any one or more of the following: circular, I-shaped, cross-shaped, and funnel-shaped. Figure 5 The above four cross-sectional shapes are shown in the figure. In practical applications, multiple mortise and tenon structures can be used simultaneously. For example, for the same pixel island 110, some support columns 410 and pixel island 110 use an I-shaped mortise and tenon structure, while some support columns 410 and pixel island 110 use a cross-shaped mortise and tenon structure; or, for different pixel islands 110, the mortise and tenon structure between each pixel island 110 and support column 410 is different, that is, different pixel islands 110 correspond to different mortise and tenon structures. The specific choice of mortise and tenon structure can be determined according to actual needs, and no specific restrictions are imposed here.

[0058] It should be noted that only the ends of the support column 410 can be set to the corresponding mortise and tenon structure shape, or the entire support column 410 can be set to the corresponding mortise and tenon structure shape. For example, the cross-sectional shape of the area of ​​the support column 410 other than the ends can be rectangular, and only the cross-sectional shape of the ends can be set to an I-shaped mortise and tenon structure; or the cross-sectional shape of the entire support column 410 can be an I-shaped mortise and tenon structure.

[0059] In this embodiment, the height of the support structure 400 is greater than 1 micrometer, preferably between 1 micrometer and 1.6 micrometers, specifically 1 micrometer, 1.2 micrometers, 1.3 micrometers, or 1.6 micrometers, etc., which can be determined according to actual needs. Generally, the height of each support column 410 is consistent.

[0060] In this embodiment, the material of the support structure 400 includes organic colloids or metals.

[0061] In one embodiment, the ultimate tensile length of the stretchable display film layer 100 is greater than the ultimate tensile length of the first elastic film layer 200 and the second elastic film layer 300. When the first elastic film layer 200 and the second elastic film layer 300 reach their tensile limits, the stretching bridge 120 has not yet reached its tensile limit. That is, during the stretching process of the screen, the first elastic film layer 200 and the second elastic film layer 300 reach their tensile limits earlier than the stretching bridge 120. Since the tensile limits of the first elastic film layer 200 and the second elastic film layer 300 determine the tensile limit of the screen, even when the screen reaches its tensile limit, the internal stretching bridge 120 can still be in a contracted state, and the stretching bridge 120 will not break due to the tensile force.

[0062] To achieve the above effect, refer to Figure 3 and Figure 4 During the assembly of the display device, the first elastic film layer 200 and the second elastic film layer 300 can be pre-stretched to a pre-stretched state, while the tension bridge 120 in the stretchable display film layer 100 is in a naturally contracted state. Then, the first elastic film layer 200 and the second elastic film layer 300 are connected to both sides of the stretchable display film layer 100 via a support structure. After connection, the tensile force on the first elastic film layer 200 and the second elastic film layer 300 is released. At this time, each elastic film layer contracts, and the tension bridge 120 contracts synchronously with the elastic film layers on both sides. This ensures that the tension bridge 120 is less likely to reach its limit of tension when the elastic film layers are subsequently stretched, thus preventing breakage.

[0063] In addition, in order to increase the pixel PPI, the overall size of the stretchable display film layer 100 can be increased by increasing the length of the stretch bridge 120 before assembly. When the elastic film layer and the stretchable display film layer 100 are assembled, the stretch bridge 120 can shrink synchronously with the elastic film layers on both sides, thereby increasing the screen PPI.

[0064] In this embodiment, the Young's modulus of the first elastic film layer 200 and the second elastic film layer 300 can be between 2 MPa and 5 MPa, specifically 2 MPa, 3 MPa, or 5 MPa, etc., and can be set according to actual needs. Generally, the Young's modulus of the first elastic film layer 200 and the second elastic film layer 300 can be set to be the same.

[0065] The thickness of the first elastic film layer 200 and the second elastic film layer 300 can be between 100 micrometers and 200 micrometers, specifically 100 micrometers, 130 micrometers, 150 micrometers, or 200 micrometers, etc., without specific limitations. The thickness of the first elastic film layer 200 and the thickness of the second elastic film layer 300 can be the same or different.

[0066] In this embodiment, each pixel island 110 is located in the same film layer but is independent of each other. Each pixel island 110 may include at least one pixel unit 130, for example, the same pixel island 110 may include a red light pixel unit, a green light pixel unit, and a blue light pixel unit. Each pixel unit 130 has a substrate, a driving layer, and a display layer stacked together. When fabricating the driving layer, a stretching bridge 120 between two adjacent pixel islands can be fabricated simultaneously. The stretching bridge 120 includes signal lines electrically connected to the driving layer, specifically including one or more of the following signal lines: gate lines, data lines, power signal lines, etc.

[0067] In one embodiment, a manufacturing process for a display device is provided, the display device including the display device provided in the above embodiments.

[0068] Reference Figures 3-5 The manufacturing process of the display device provided in this embodiment includes the following steps:

[0069] Step S200: Pre-stretch the first elastic membrane layer 200 and the second elastic membrane layer 300 to achieve a pre-stretched state.

[0070] Step S400: Connect the first elastic film layer 200 and the second elastic film layer 300 to both sides of the stretchable display film layer 100, wherein a support structure 400 is connected between the stretchable display film layer 100 and the first elastic film layer 200 and / or between the stretchable display film layer 100 and the second elastic film layer 300, and the stretchable display film layer 100 is in a naturally contracted state.

[0071] Step S600: Release the pre-stretch force applied to the first elastic membrane layer 200 and the second elastic membrane layer 300, so that the first elastic membrane layer 200 and the second elastic membrane layer 300 return to their natural contraction state.

[0072] During the assembly of the display device, the first elastic film layer 200 and the second elastic film layer 300 can be pre-stretched to a pre-stretched state, while the stretchable display film layer 100 is in a naturally contracted state. Then, the first elastic film layer 200 and the second elastic film layer 300 are connected to both sides of the stretchable display film layer 100 via the support structure 400. After connection, the pre-stretch force on the first elastic film layer 200 and the second elastic film layer 300 is released. At this point, each elastic film layer contracts, and the stretchable display film layer 100 contracts synchronously with the elastic film layers on both sides. This ensures that when each elastic film layer is subsequently stretched, the stretchable display film layer 100 is less likely to reach its limit of tension, thus reducing the risk of breakage.

[0073] The stretchable display film layer includes several pixel islands and several stretch bridges, with adjacent pixel islands connected by stretch bridges. To increase the pixel PPI, the overall size of the stretchable display film layer 100 can be increased before assembly by increasing the length of the stretch bridges 120. When the elastic film layer and the stretchable display film layer 100 are assembled, the stretch bridges 120 can shrink synchronously with the elastic film layers on both sides, thereby increasing the screen PPI.

[0074] The display device obtained through the above-described manufacturing process has a support structure 400 between the stretchable display film layer 100 and the first elastic film layer 200 and / or between the stretchable display film layer 100 and the second elastic film layer 300. This allows the first elastic film layer 200 and / or the second elastic film layer 300 to maintain a distance from the stretchable display film layer 100. As a result, when the first elastic film layer 200 and the second elastic film layer 300 stretch the entire screen, the friction between the first elastic film layer 200, the second elastic film layer 300 and the stretchable display film layer 100 can be reduced or avoided. On the one hand, this protects the stretchable display film layer 100 from damage caused by friction during stretching. On the other hand, it also increases the stretching freedom of the first elastic film layer 200, the second elastic film layer 300 and the stretchable display film layer 100, thereby improving the stretchability of the display device.

[0075] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A display device, characterized in that, include: A stretchable display film layer includes a plurality of pixel islands, each pixel island including at least one pixel unit, and each pixel island including a first side and a second side opposite to each other, wherein the pixel unit is disposed on the second side; The first elastic film layer and the second elastic film layer are respectively disposed on both sides of the stretchable display film layer; The support structure includes a first support structure and a second support structure. The first support structure is connected between the first side and the first elastic membrane layer and is formed on the first elastic membrane layer. The connection between the first support structure and the first side is a mortise and tenon joint. The second support structure is connected between the second side and the second elastic membrane layer and is formed on the second side or the second elastic membrane layer. When the second support structure is formed on the second side, the connection between the second support structure and the second elastic membrane layer is a mortise and tenon joint. When the second support structure is formed on the second elastic membrane layer, the connection between the second support structure and the second side is a mortise and tenon joint.

2. The display device according to claim 1, characterized in that, Adjacent pixel islands are connected by a stretch bridge.

3. The display device according to claim 1, characterized in that, The support structure is provided between two adjacent pixel units on the same pixel island.

4. The display device according to claim 1, characterized in that, The support structure on the same pixel island is spaced apart from the pixel unit.

5. The display device according to claim 1, characterized in that, Along a direction perpendicular to the support structure, the cross-sectional shape of the support structure includes any one or more of the following: circular, I-shaped, cross-shaped, and funnel-shaped.

6. The display device according to claim 1, characterized in that, The ultimate tensile length of the stretchable display film is greater than the ultimate tensile lengths of the first elastic film and the second elastic film.

7. The display device according to claim 1, characterized in that, The height of the support structure is greater than 1 micrometer.

8. The display device according to claim 1, characterized in that, The supporting structure is made of organic colloids or metals.

9. A manufacturing process for a display device according to any one of claims 1-8, characterized in that, include: The first elastic membrane layer and the second elastic membrane layer are pre-stretched to achieve a pre-stretched state; The first elastic film layer and the second elastic film layer are connected to both sides of the stretchable display film layer. The stretchable display film layer includes a plurality of pixel islands, each pixel island including at least one pixel unit. Each pixel island includes a first side and a second side facing each other. The second side is provided with the pixel unit. A first support structure is connected between the first side and the first elastic film layer and is formed on the first elastic film layer. The connection between the first support structure and the first side is a tenon-and-mortise connection. A second support structure is connected between the second side and the second elastic film layer and is formed on the second side or the second elastic film layer. When the second support structure is formed on the second side, the connection between the second support structure and the second elastic film layer is a tenon-and-mortise connection. When the second support structure is formed on the second elastic film layer, the connection between the second support structure and the second side is a tenon-and-mortise connection. The stretchable display film layer is in a naturally contracted state. Release the pre-stretch force applied to the first elastic membrane layer and the second elastic membrane layer, so that the first elastic membrane layer and the second elastic membrane layer return to their natural contraction state.

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