Methods for manufacturing display panels and display panels

Abstract

This application discloses a method for manufacturing a display panel and the display panel itself. The method includes sequentially stacking an adhesive layer and a protective layer on one side of the display screen. The display screen includes interconnected panel portions and a first cutting portion, the first cutting portion being located on the outer side of the panel portion, with a reserved area formed at a partial edge of the panel portion. The adhesive layer corresponds to the gap in the reserved area, covering all areas of the panel portion except the reserved area, and partially covering the first cutting portion. The protective layer covers the entire panel portion and the entire first cutting portion. The first cutting portion, along with a portion of the adhesive layer and a portion of the protective layer located at the first cutting portion, are cut away, so that the remaining protective layer forms a tear-off portion for the portion applied to the reserved area. This method ensures that the shape of the adhesive layer matches the shape of the display screen substrate, which helps reduce the width of the display screen bezel, while the tear-off portion ensures that the protective layer is easy to remove.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a method for preparing a display panel and the display panel itself. Background Technology

[0002] Currently, the cover plate and display screen of a display panel are usually bonded together using optically clear adhesive. This adhesive is recessed by a certain dimension relative to the outer contour of the display screen, resulting in a relatively large display bezel.

[0003] To reduce the width of the display bezel, optically clear adhesive is pre-attached to the display screen. When the attached display panel is cut using a laser, the shape of the optically clear adhesive matches the shape of the display screen. Because the optically clear adhesive (including the protective layer) and the display screen are cut as a single piece, the protective layer on the surface of the optically clear adhesive fuses with it, making the protective layer difficult to peel off as it cannot be raised at the corners. Summary of the Invention

[0004] This application provides a method for manufacturing a display panel and a display panel, so as to reduce the bezel width while avoiding the protective film being difficult to remove.

[0005] To solve the above-mentioned technical problems, the first technical solution provided in this application is: to provide a display panel, including a display screen and an adhesive layer, wherein the display screen includes a panel portion, and a reserved area is formed by a partial edge of the panel portion; the adhesive layer is disposed on one side of the display screen; the adhesive layer corresponds to a gap in the reserved area, and the adhesive layer covers all areas of the panel portion except for the reserved area.

[0006] In one embodiment, the panel portion includes a display portion and a frame portion; the reserved area is located at a partial edge of the frame portion; the adhesive layer covers the entire display portion and covers all areas of the frame portion except for the reserved area;

[0007] Preferably, the display part is quadrilateral, the frame part surrounds the display part, and the reserved area is located at the corner of the frame part.

[0008] In one embodiment, the display screen further includes a mounting portion disposed on the outer side of the panel portion, the mounting portion being connected to the panel portion;

[0009] The adhesive layer is not provided on the binding part; the reserved area is adjacent to the binding part.

[0010] To address the aforementioned technical problems, the second technical solution provided in this application is: a method for manufacturing a display panel, comprising sequentially stacking an adhesive layer and a protective layer on one side of the display screen; wherein the display screen includes interconnected panel portions and a first cutting portion, the first cutting portion being located on the outer side of the panel portion, and a reserved area being formed at a partial edge of the panel portion; the adhesive layer corresponding to a gap in the reserved area, the adhesive layer covering all areas of the panel portion except for the reserved area, and the adhesive layer partially covering the first cutting portion; the protective layer covering the entire panel portion and the entire first cutting portion;

[0011] The first cut portion, as well as a portion of the adhesive layer and a portion of the protective layer located in the first cut portion, are cut away to form a tear-off portion corresponding to the portion of the reserved area of ​​the remaining protective layer.

[0012] In one embodiment, the panel portion includes a display portion and a frame portion; the reserved area is located at a partial edge of the frame portion; the adhesive layer covers the entire display portion and covers all areas of the frame portion except for the reserved area;

[0013] Preferably, the display part is quadrilateral, the frame part surrounds the display part, and the reserved area is located at the corner of the frame part.

[0014] In one embodiment, the display screen further includes a binding portion disposed on the outer side of the panel portion, the binding portion being connected to the panel portion, and the binding portion being spaced apart from the first cutting portion;

[0015] The adhesive layer is not provided on the bonding portion; the reserved area is adjacent to the bonding portion;

[0016] Preferably, the panel portion is quadrilateral, the binding portion is disposed on one side of the panel portion, and the first cutting portion is disposed on the other three sides of the panel portion; the reserved area is located at the corner of the panel portion adjacent to the binding portion.

[0017] In one embodiment, the method further includes, prior to the step of sequentially stacking the adhesive layer and the protective layer on one side of the display screen:

[0018] A prefabricated display screen is obtained, wherein the prefabricated display screen includes the panel portion, the binding portion, the first cutting portion, and the second cutting portion; the first cutting portion is connected to the second cutting portion, and the first cutting portion and the second cutting portion surround the outer contour of the panel portion and the binding portion;

[0019] The second cutting portion is removed by cutting.

[0020] In one embodiment, the method further includes: peeling off the remaining protective layer starting from the peeling portion; and attaching a cover plate to the side of the adhesive layer away from the display screen.

[0021] In one embodiment, the protective layer further covers a portion of the binding portion and extends beyond the edge of the binding portion to form a tear-off handle, the length direction of the tear-off handle being perpendicular to the direction of the panel portion pointing towards the binding portion;

[0022] The step of removing the remaining protective layer, starting from the tear-off portion, specifically includes:

[0023] Pull the tear handle to remove the remaining protective layer starting from the tear-off portion.

[0024] In one embodiment, the adhesive layer is an optically transparent adhesive; and / or the protective layer is a heavy-duty film.

[0025] The beneficial effects of this application are as follows: Unlike existing technologies, this application discloses a method for manufacturing a display panel and a display panel itself. The method for manufacturing a display panel includes sequentially stacking an adhesive layer and a protective layer on one side of the display screen; wherein the display screen includes interconnected panel portions and a first cutting portion, the first cutting portion being located on the outer side of the panel portion, and a reserved area being formed at a partial edge of the panel portion; the adhesive layer corresponding to the gap at the reserved area, the adhesive layer covering all areas of the panel portion except the reserved area, and partially covering the first cutting portion; the protective layer covering the entire panel portion and the entire first cutting portion; cutting away the first cutting portion and a portion of the adhesive layer and the protective layer located at the first cutting portion, so that the remaining protective layer forms a tear-off portion for the portion applied to the reserved area. Through the above method, the shape of the adhesive layer is consistent with the shape of the display screen substrate, which helps to reduce the width of the display screen bezel, while the tear-off portion ensures that the protective layer is easy to remove. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a top view of the display panel provided in an embodiment of this application;

[0028] Figure 2 yes Figure 1 An enlarged structural diagram of the X region of the display panel shown in the figure;

[0029] Figure 3 yes Figure 1The diagram shows a cross-sectional view of the display panel along line AA.

[0030] Figure 4 This is a schematic flowchart of the first embodiment of the method for manufacturing a display panel provided in this application;

[0031] Figure 5 yes Figure 4 A schematic diagram of step S11 of the method for manufacturing the display panel shown;

[0032] Figure 6 yes Figure 4 A schematic diagram of step S12 of the method for manufacturing the display panel shown;

[0033] Figure 7 This is a schematic flowchart of the second embodiment of the method for manufacturing a display panel provided in this application;

[0034] Figure 8 yes Figure 7 A schematic diagram of step S13 of the method for manufacturing the display panel shown;

[0035] Figure 9 This is a schematic flowchart of the third embodiment of the method for manufacturing a display panel provided in this application;

[0036] Figure 10 yes Figure 9 The diagram shows a structural schematic of step S00 of the method for manufacturing the display panel. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0039] The terms "first," "second," and "third" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the stated features. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indications also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0040] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] Please see Figure 1 and Figure 2 , Figure 1 This is a top view of the display panel provided in an embodiment of this application; Figure 2 yes Figure 1 An enlarged structural diagram of the X region of the display panel shown in the figure; Figure 3 yes Figure 1 The diagram shows a cross-sectional view of the display panel along line AA.

[0043] This application provides a display panel 1. In one embodiment, the display panel 1 is a flexible display panel.

[0044] The display panel 1 includes a display screen 11 and an adhesive layer 12. The display screen 11 includes a panel portion 111; a reserved area A is formed at a partial edge of the panel portion 111. The adhesive layer 12 is disposed on one side of the display screen 11; the adhesive layer 12 corresponds to the gap at the reserved area A, and covers all areas of the panel portion 111 except for the reserved area A. Optionally, the adhesive layer 12 is an optically transparent adhesive.

[0045] Specifically, the panel portion 111 includes a display portion 1111 and a frame portion 1112. The reserved area A is located at a partial edge of the frame portion 1112. The adhesive layer 12 covers the entire display portion 1111 and covers all areas of the frame portion 1112 except for the reserved area A.

[0046] It is understood that in the prior art, the adhesive layer is recessed around the entire circumference of the display portion, and the final bezel width of the display panel is the sum of the width of the bezel portion and the recessed width of the adhesive layer. However, in this invention, by setting the reserved area A in the bezel portion 1112, and the adhesive layer 12 covering the entire display portion 1111, the final bezel width of the display panel 1 is the same as the width of the bezel portion 1112, reducing the bezel width and increasing the screen-to-body ratio. A peelable portion is formed on the protective film on the surface of the adhesive layer 12 corresponding to the reserved area A, facilitating the removal of the protective film, as described in the following description of the display panel manufacturing method.

[0047] Continue reading Figure 1 The display screen 11 also includes a bonding portion 112 disposed on the outer side of the panel portion 111, and the bonding portion 112 is connected to the panel portion 111. Optionally, the adhesive layer 12 is not disposed on the bonding portion 112, and the reserved area A is adjacent to the bonding portion 112.

[0048] In one embodiment, the display portion 1111 is quadrilateral, and the frame portion 1112 surrounds the display portion 1111. A reserved area A is located at a corner of the frame portion 1112. Exemplarily, the frame portion 1112 has one reserved area A, located at a corner of the frame portion 1112 adjacent to the binding portion 112. Exemplarily, the frame portion 1112 has two reserved areas A, each located at a corner of the frame portion 1112 adjacent to the binding portion 112. Exemplarily, the frame portion 1112 has one reserved area A, located at the edge where the frame portion 1112 connects to the binding portion 112 and extends to at least one corner of the frame portion 1112 adjacent to the binding portion 112.

[0049] Continue reading Figure 3 The display panel 1 also includes a cover plate 13, which is attached to the display screen 11 by an adhesive layer 12. In one embodiment, the cover plate 13 is made of glass.

[0050] This application also provides an electronic device, which may be a laptop computer, a personal digital assistant (PDA), a mobile phone, etc. The electronic device includes the display panel provided in the above embodiments.

[0051] Please see Figures 4-6 , Figure 4This is a schematic flowchart of the first embodiment of the display panel manufacturing method provided in this application. Figure 5 yes Figure 4 The diagram shows a structural schematic of step S11 in the method for manufacturing the display panel. Figure 6 yes Figure 4 The diagram shows a structural schematic of step S12 of the method for manufacturing the display panel.

[0052] This application provides a first embodiment of a method for manufacturing a display panel 1, the specific scheme of which is as follows:

[0053] Step S11: An adhesive layer 12 and a protective layer 14 are sequentially stacked on one side of the display screen 11; wherein, the display screen 11 includes a panel portion 111 and a first cutting portion 113 connected to each other, the first cutting portion 113 is located on the outside of the panel portion 111, and a reserved area A is formed by a partial edge of the panel portion 111; the adhesive layer 12 corresponds to the gap at the reserved area A, the adhesive layer 12 covers all areas of the panel portion 111 except for the reserved area A, and the adhesive layer 12 covers part of the first cutting portion 113; the protective layer 14 covers the entire panel portion 111 and the entire first cutting portion 113.

[0054] Specifically, the panel portion 111 includes a display portion 1111 and a frame portion 1112. The display portion 1111 is the part of the display panel 1 used for display, and the frame portion 1112 is the non-display portion of the display panel 1 used for wiring, etc. The reserved area A is located at a partial edge of the frame portion 1112. The adhesive layer 12 covers the entire display portion 1111 and covers all areas of the frame portion 1112 except for the reserved area A.

[0055] The display screen 11 also includes a bonding portion 112 disposed on the outer side of the panel portion 111. The bonding portion 112 is connected to the panel portion 111, and the bonding portion 112 is spaced apart from the first cutting portion 113. The adhesive layer 12 is not disposed on the bonding portion 112; it can be understood that since the cover plate only covers the panel portion 111, it does not need to cover the bonding portion 112, and the adhesive layer 12 can be disposed on the panel portion 111 to achieve the adhesion of the cover plate 13. The reserved area A is disposed adjacent to the bonding portion 112, and the protective layer 14 corresponds to the portion between the bonding portion 112 and the first cutting portion 113, which facilitates the formation of the tear-off handle 141a described later.

[0056] In one embodiment, the display portion 1111 is quadrilateral, and the frame portion 1112 surrounds the display portion 1111. The binding portion 112 is disposed on one side of the panel portion 111, and the first cutting portion 113 is disposed on the other three sides of the panel portion 111. The reserved area A is located at the corner of the frame portion 1112. It can be understood that during the process of peeling off the protective layer 14, using a smaller area of ​​the panel portion 111 as the starting point requires less force than using one side of the panel portion 111 as the starting point. Placing the reserved area A at the corner of the frame portion 1112 makes it easier to peel off the protective layer 14 from the adhesive layer 12 than placing the reserved area A on one side of the frame portion 1112. Furthermore, the reserved area A is located at the corner of the panel portion 111 adjacent to the binding portion 112.

[0057] In one embodiment, the adhesive layer 12 is an optically transparent adhesive, and / or the protective layer 14 is a heavy film.

[0058] Step S12: Cut and remove the first cutting portion 113 and a portion of the adhesive layer 12 and a portion of the protective layer 14 located in the first cutting portion 113, so that the remaining protective layer 14 forms a tear-off portion 141b corresponding to the portion of the reserved area A.

[0059] Specifically, along the boundary line between the first cutting portion 113 and the display portion 1111, a cut is made penetrating the display screen 11, the adhesive layer 12, and the protective layer 14 to remove the first cutting portion 113 and a portion of the adhesive layer 12 and the protective layer 14 located within the first cutting portion 113. In other words, a one-piece cutting method is used to remove the first cutting portion 113 and a portion of the adhesive layer 12 and the protective layer 14 located within the first cutting portion 113. Since the adhesive layer 12 corresponds to the gap at the reserved area A, during the one-piece cutting process, the portion of the protective layer 14 located in the reserved area A will not sinter and melt with the adhesive layer 12. The cut portion of the protective layer 14 corresponding to the reserved area A forms a tear-off portion 141b, making it easier to peel off the protective layer 14 at an angle.

[0060] For example, a reserved area A is provided on the border portion 1112. The reserved area A is located at a corner of the border portion 1112 adjacent to the binding portion 112, forming a tear-off portion 141b.

[0061] For example, the frame portion 1112 is provided with two reserved areas A, which are located at two corners of the frame portion 1112 adjacent to the binding portion 112, forming two tear-off portions 141b.

[0062] For example, a reserved area A is provided on the frame portion 1112. The reserved area A is located at the edge where the frame portion 1112 connects with the binding portion 112 and extends to at least one corner of the frame portion 1112 adjacent to the binding portion 112, forming a tear-off portion 141b.

[0063] By forming a reserved area A on a partial edge of the panel portion 111, and then integrally cutting the display screen 11, adhesive layer 12, and protective layer 14, the edge of the adhesive layer 12 is basically flush with the edge of the panel portion 111 (except for the portion corresponding to the reserved area A, the edge of the adhesive layer 12 in other portions is flush with the edge of the panel portion 111). This helps to reduce the width of the bezel of the display panel 1 (the width of the bezel of the display panel 1 is equal to the width of the bezel portion 1112; while in the prior art, the adhesive layer 12 is recessed around the entire circumference of the panel portion 111, and the width of the bezel is equal to the sum of the width of the bezel portion 1112 and the width of the recessed adhesive layer 12), thus increasing the screen-to-body ratio. At the same time, the portion of the adhesive layer 12 corresponding to the reserved area A is left blank, preventing the adhesive layer 12 and the protective layer 14 from sticking together at the position where the first cutting portion 113 is adjacent to the reserved area A. This allows the portion of the protective layer 14 corresponding to the reserved area A to form a tear-off portion 141b, making it easier for the cut protective layer 14 to form a corner without pulling up the adhesive layer 12, thus reducing the difficulty of tearing.

[0064] Please see Figure 7 , Figure 7 This is a schematic flowchart of the second embodiment of the display panel manufacturing method provided in this application. Figure 8 yes Figure 7 The diagram shows a structural schematic of step S13 of the method for manufacturing the display panel.

[0065] The second embodiment of the method for preparing display panel 1 provided in this application is basically the same as the first embodiment of the method for preparing display panel 1, except that: after step S12, steps S13 and S14 are also included.

[0066] Step S13: Starting from the tear-off part 141b, tear off the remaining protective layer 14.

[0067] In one embodiment, the protective layer 14 also covers a portion of the binding portion 112 and extends beyond the edge of the binding portion 112 to form a tear-off handle 141a. The length direction of the tear-off handle 141a is perpendicular to the direction in which the panel portion 111 points towards the binding portion 112. Pulling the tear-off handle 141a causes the remaining protective layer 14 to be torn off starting from the tear-off portion 141b. By providing the tear-off handle 141a, it is convenient for machine operation to tear off the protective layer 14.

[0068] For example, the frame portion 1112 is provided with two reserved areas A, which are located at two corners of the frame portion 1112 adjacent to the binding portion 112, forming two tear-off portions 141b. Each tear-off portion 141b is provided with a tear-off handle 141a.

[0069] Step S14: Attach the cover plate 13 to the side of the adhesive layer 12 away from the display screen 11.

[0070] Specifically, the cover plate 13 covers the entire panel portion 111. In one embodiment, the cover plate 13 is made of glass.

[0071] Please see Figure 9 , Figure 9 This is a schematic flowchart of the third embodiment of the display panel manufacturing method provided in this application. Figure 10 yes Figure 9 The diagram shows a structural schematic of step S00 of the method for manufacturing the display panel.

[0072] The third embodiment of the method for preparing the display panel 1 provided in this application is basically the same as the first embodiment of the method for preparing the display panel 1, except that: it further includes steps S00 and S10 before step S11.

[0073] Step S00: Obtain a prefabricated display screen 11a, wherein the prefabricated display screen 11a includes a panel portion 111, a binding portion 112, a first cutting portion 113, and a second cutting portion 114; the first cutting portion 113 is connected to the second cutting portion 114, and the first cutting portion 113 and the second cutting portion 114 surround the outer contour of the panel portion 111 and the binding portion 112.

[0074] In one embodiment, the outer contour of the prefabricated display screen 11a is rectangular, the outer contour of the panel portion 111 and the first cutting portion 113 as a whole is rectangular, and the outer contour of the binding portion 112 and the second cutting portion 114 as a whole is rectangular.

[0075] Step S10: Cut and remove the second cutting part 114.

[0076] Specifically, the display screen 11 of step S11 is formed after the second cut portion 114 is cut away.

[0077] The final shape of the display panel 1 is determined by two cuts. In the second cutting process (cutting the first cutting part 113), the adhesive layer 12, the protective layer 14 and the display screen 11 are cut together. The protective layer 14 retains a tear-off handle 141a or a tear-off part 141b to facilitate the removal of the protective layer 14.

[0078] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A display panel, characterized in that, include: The display screen includes a panel portion, wherein a reserved area is formed at a partial edge of the panel portion; the panel portion includes a display portion and a frame portion; the reserved area is located at a partial edge of the frame portion. An adhesive layer is disposed on one side of the display screen; the adhesive layer corresponds to the gap in the reserved area, the adhesive layer covers the entire display part, and covers all areas of the frame part except for the reserved area; the adhesive layer is an optically transparent adhesive.

2. The display panel according to claim 1, characterized in that, The display section is quadrilateral, the frame section surrounds the display section, and the reserved area is located at the corner of the frame section.

3. The display panel according to claim 1, characterized in that, The display screen also includes a mounting portion disposed on the outer side of the panel portion, the mounting portion being connected to the panel portion; The adhesive layer is not provided on the binding part; the reserved area is adjacent to the binding part.

4. A method for manufacturing a display panel, characterized in that, include: An adhesive layer and a protective layer are sequentially stacked on one side of the display screen; wherein, the display screen includes an interconnected panel portion and a first cut portion, the first cut portion being located on the outer side of the panel portion; a reserved area is formed at a partial edge of the panel portion; the panel portion includes a display portion and a frame portion; the reserved area is located at a partial edge of the frame portion; the adhesive layer covers the entire display portion and all areas of the frame portion except for the reserved area; the adhesive layer partially covers the first cut portion; the protective layer covers the entire panel portion and the entire first cut portion; the adhesive layer is an optically transparent adhesive; The first cut portion, as well as a portion of the adhesive layer and a portion of the protective layer located in the first cut portion, are cut away to form a tear-off portion corresponding to the portion of the reserved area of ​​the remaining protective layer.

5. The method according to claim 4, characterized in that, The display section is quadrilateral, the frame section surrounds the display section, and the reserved area is located at the corner of the frame section.

6. The method according to claim 4, characterized in that, The display screen also includes a binding part disposed on the outer side of the panel portion, the binding part being connected to the panel portion, and the binding part being spaced apart from the first cutting portion; The adhesive layer is not provided on the binding part; the reserved area is adjacent to the binding part.

7. The method according to claim 6, characterized in that, The panel is quadrilateral, the binding part is located on one side of the panel, and the first cutting part is located on the other three sides of the panel; the reserved area is located at the corner of the panel adjacent to the binding part.

8. The method according to claim 6, characterized in that, Before the step of sequentially stacking the adhesive layer and protective layer on one side of the display screen, the following steps are also included: A prefabricated display screen is obtained, wherein the prefabricated display screen includes the panel portion, the binding portion, the first cutting portion, and the second cutting portion; the first cutting portion is connected to the second cutting portion, and the first cutting portion and the second cutting portion surround the outer contour of the panel portion and the binding portion; The second cut portion is removed by cutting.

9. The method according to claim 6, characterized in that, The method further includes: Starting from the tear-off portion, remove the remaining protective layer; A cover plate is attached to the side of the adhesive layer away from the display screen.

10. The method according to claim 9, characterized in that, The protective layer also covers part of the binding portion and extends from the edge of the binding portion to form a tear-off handle, the length direction of which is perpendicular to the direction of the panel portion pointing towards the binding portion; The step of removing the remaining protective layer, starting from the tear-off portion, specifically includes: Pull the tear handle to remove the remaining protective layer starting from the tear-off portion.

11. The method according to claim 4, characterized in that, The protective layer is a heavy-duty film.

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