Spliced display device

Abstract

The utility model discloses a tiled display device. The spliced display device comprises at least two spliced display panels, each display panel comprises a wire and a protective structure, and the wires are arranged on at least one side wall of the display panels; the protection structure and the wires are arranged on the same side wall of the display panel; wherein the protection structure of one display panel is in contact with the protection structure or the side wall of the other display panel, and the maximum height of the protection structure is larger than the maximum height of the wire. According to the display panel, the wires and the protection structures are arranged on the side walls of the display panel, the maximum height of the protection structures is larger than the maximum height of the wires, when the edges of the two adjacent display panels collide, due to the fact that the protection structures are higher, the protection structures can interfere with each other, the wires of the adjacent display panels are prevented from colliding, and the display effect is improved. Therefore, the wiring can be prevented from being damaged due to collision.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a spliced display device. Background Art

[0002] A tiled display device can be constructed by splicing multiple display panels. To improve the performance of the tiled display, it is usually necessary to reduce the distance between the display areas of two adjacent display panels. Related technologies use a side-bonding process to set wiring on the sides and backs of the display panels, achieving interconnection between the front, side, and back wiring, thereby transferring driver chips and other components to the backs of the display panels.

[0003] However, during the splicing process of the display panels, the edges of two adjacent display panels collide, which may cause damage to the side wiring. The damaged wiring may affect the reliability of signal transmission.

[0004] Therefore, it is urgent to solve the above technical problems. Utility Model Content

[0005] The present application provides a spliced display device to solve the technical problem that the edges of two adjacent display panels collide with each other, causing damage to the wiring on the side.

[0006] To solve the above technical problems, the technical solutions provided by this application are as follows:

[0007] The present application provides a spliced display device, comprising at least two spliced display panels, wherein the display panel comprises:

[0008] a wiring, provided on at least one side wall of the display panel;

[0009] A protective structure is provided on the same side wall of the display panel as the wiring;

[0010] The protective structure of one display panel is arranged in contact with the protective structure or side wall of another display panel, and the maximum height of the protective structure is greater than the maximum height of the wiring arranged on the same side wall as the protective structure.

[0011] In the spliced display device of the present application, the wiring is arranged in the middle area of the side wall, the protective structure is arranged in the two edge areas of the side wall, and the middle area and the edge area are arranged along the long side of the side wall.

[0012] In the spliced display device of the present application, the orthographic projection of the protective structure on the side wall is located inside the side wall.

[0013] In the spliced display device of the present application, the protective structure is arranged on the two opposite side walls of each display panel, and the protective structure includes at least one first structure and at least one second structure arranged on the two opposite side walls of the same display panel, the first structure includes at least one protrusion, and the second structure includes at least one groove, and one protrusion of two adjacent display panels cooperates with one groove.

[0014] In the spliced display device of the present application, the first structure is disposed on one of the two opposite side walls of the display panel, and the second structure is disposed on the other of the two opposite side walls of the display panel.

[0015] In the spliced display device of the present application, the length of the mutually fitting protrusions is equal to the length of the groove, and the height of the mutually fitting protrusions is equal to the depth of the groove.

[0016] In the spliced display device of the present application, the first structure includes a first substrate and at least one protrusion provided on the first substrate, and the second structure includes a second substrate and at least two protrusions provided on the second substrate, with the groove formed between two adjacent protrusions.

[0017] In the spliced display device of the present application, the first structure includes at least three protrusions, and in the direction of the long side of the side wall, at least two of the protrusions have different lengths.

[0018] In the spliced display device of the present application, the display panel includes a substrate and a display layer disposed on one side surface of the substrate, and the elastic modulus of the protective structure is less than or equal to the elastic modulus of the substrate.

[0019] In the spliced display device of the present application, the material of the protective structure is any one of silicone, resin glue, glass glue, silver paste, solder paste, and glass.

[0020] Beneficial effects: The present application discloses a spliced display device. The spliced display device includes at least two spliced display panels, the display panels including wiring and a protective structure, the wiring being provided on at least one side wall of the display panel; the protective structure and the wiring being provided on the same side wall of the display panel; wherein the protective structure of one display panel is provided in contact with the protective structure or side wall of another display panel, and the maximum height of the protective structure is greater than the maximum height of the wiring. The present application arranges wiring and protective structures on the side walls of the display panels, and the maximum height of the protective structure is greater than the maximum height of the wiring. When the edges of two adjacent display panels collide, the protective structures will interfere with each other because they are higher, thereby preventing the wiring of the adjacent display panels from being collided, thereby preventing the wiring from being damaged due to the collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0022] Figure 1 A schematic top view of a spliced display device according to an embodiment of the present application;

[0023] Figure 2 for Figure 1 An enlarged structural diagram of a display panel;

[0024] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at CC in FIG;

[0025] Figure 4 for Figure 1 A schematic diagram of a splicing and magnifying structure of a display panel;

[0026] Figure 5 for Figure 1 A schematic diagram of an enlarged structure of another display panel after disassembly;

[0027] Figure 6 for Figure 1 A schematic diagram of an enlarged structure of another display panel after disassembly;

[0028] Figure 7A for Figure 5 Schematic diagram of staggered splicing of display panels;

[0029] Figure 7B for Figure 6 Schematic diagram of the fool-proofing principle of the display panel.

[0030] Description of reference numerals:

[0031] Spliced display device 1, display panel 10, side wall 11, trace 12, substrate 13, display layer 14, driver chip 15, flexible circuit board 16, protective structure 20, first structure 21, protrusion 211, first protrusion 211a, second protrusion 211b, first base 212, second structure 22, groove 221, first groove 221a, second groove 221b, second base 222, bump 223, length L1 of protrusion 211, length L2 of groove 221, height H1 of protrusion 211, depth H2 of groove 221, maximum height D1 of protective structure 20, maximum height D2 of trace 12. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0033] The present application provides a splicing display device 1, such as Figures 1 to 4 As shown, the spliced display device 1 includes at least two spliced display panels 10, the display panel 10 includes a wiring 12 and a protective structure 20, the wiring 12 is arranged on at least one side wall 11 of the display panel 10, the protective structure 20 and the wiring 12 are arranged on the same side wall 11 of the display panel 10, the protective structure 20 of one display panel 10 is arranged in contact with the protective structure 20 or side wall 11 of another display panel 10, and the maximum height D1 of the protective structure 20 is greater than the maximum height D2 of the wiring 12.

[0034] In this embodiment, the display panel 10 may be an LCD panel, an OLED panel, a Mini-LED panel, a Micro-LED panel, or the like.

[0035] In this embodiment, if Figure 2 and Figure 3 As shown, the front of the display panel 10 is used to display the image, and the back of the display panel 10 is the surface opposite to the front. The side wall 11 connects the front and back. The display panel 10 can adopt a side binding process, and the wiring 12 of the side wall 11 extends to the front of the display panel 10 and the back of the display panel 10, and the wiring 12 on the back of the display panel 10 is connected to the binding structure. The binding structure can be a flexible circuit board 16 or a driver chip 15, etc. Through the above arrangement, the border width of the display panel 10 can be reduced, the splicing seam of the spliced display device 1 can be reduced, and a better display effect can be achieved.

[0036] like Figure 4 As shown, the spliced display device 1 may include at least two display panels 10, with the sidewalls 11 of two adjacent display panels 10 being close to each other. When one of the two adjacent sidewalls 11 is provided with a wiring 12, the sidewall 11 provided with the wiring 12 may also be provided with a protective structure 20 to prevent damage to the wiring 12 after collision. The sidewall 11 not provided with a wiring may not be provided with the protective structure 20.

[0037] For ease of description, the area where the sidewalls 11 of two adjacent display panels 10 are close to each other is referred to as a splicing area. Within the splicing area, at least one of the two sidewalls 11 of the display panel 10 is provided with both the wiring 12 and the protective structure 20. This means that one of the two sidewalls 11 is provided with both the wiring 12 and the protective structure 20, while the other sidewall 11 is not provided with either the wiring 12 or the protective structure 20; alternatively, each of the two sidewalls 11 is provided with both the wiring 12 and the protective structure 20.

[0038] When both the wiring 12 and the protective structure 20 are provided on one of the two sidewalls 11, and neither the wiring 12 nor the protective structure 20 is provided on the other sidewall 11, the protective structure 20 on one sidewall 11 is arranged in contact with the other sidewall 11. When both the wiring 12 and the protective structure 20 are provided on each of the two sidewalls 11, the protective structure 20 on one sidewall 11 is arranged in contact with the protective structure 20 on the other sidewall 11.

[0039] In this embodiment, if Figure 2 As shown, the maximum height D1 of the protective structure 20 is greater than the maximum height D2 of the trace 12. The maximum height D1 of the protective structure 20 refers to the maximum value of the dimensions of the protective structure 20 in a direction perpendicular to the surface of the sidewall 11, while the maximum height D2 of the trace 12 refers to the maximum value of the dimensions of the trace 12 in a direction perpendicular to the surface of the sidewall 11. Because the maximum height D1 of the protective structure 20 is greater than the maximum height D2 of the trace 12, when the sidewalls 11 collide with each other, the protective structure 20 interferes with the adjacent display panel 10, thereby preventing the trace 12 from being collided with and thus preventing damage to the trace 12.

[0040] In the splicing display device 1 of the present application, as Figure 2 As shown, the wiring 12 is arranged in the middle area of the side wall 11 , and the protective structure 20 is arranged in the two edge areas of the side wall 11 . The middle area and the edge area are arranged along the long side of the side wall 11 .

[0041] The display panel 10 is flat, and the area of the front surface of the display panel 10 is larger than the area of the sidewall 11 of the display panel 10. The surface of the sidewall 11 can be rectangular, with the long side of the rectangle corresponding to the direction of the long side of the sidewall 11, and the short side of the rectangle corresponding to the direction of the short side of the sidewall 11. The length of the short side of the sidewall 11 corresponds to the thickness of the display panel 10.

[0042] In this embodiment, the middle area and the edge area of the side wall 11 are arranged along the direction of the long side of the side wall 11. Figure 2In the embodiment, the long side of the side wall 11 is in the vertical direction. The wiring 12 is arranged in the middle area, and the protective structure 20 is respectively arranged in the edge areas on both sides of the wiring 12. Through the above arrangement, the distance between the two adjacent display panels 10 in the horizontal direction can be close, thereby preventing the display panels 10 from being skewed. This is because, when the protective structure 20 is only provided in one of the edge areas of the side wall 11, the distance between the other edge area and the side wall 11 of the adjacent display panel 10 is smaller, and the distances between the two edge areas and the adjacent side walls 11 are different, which can easily cause the display panels 10 to be skewed when spliced, affecting the display effect of the picture.

[0043] At the same time, since the protective structures 20 are provided on both sides of the wiring 12 , the protective structures 20 can separate the wiring 12 from the sidewalls 11 of the adjacent display panel 10 , further reducing the risk of the wiring 12 being damaged by collision.

[0044] In the spliced display device 1 of the present application, the orthographic projection of the protective structure 20 on the side wall 11 is located inside the side wall 11. This arrangement can prevent the protective structure 20 disposed on the side wall 11 of one display panel 10 from interfering with the side wall 11 of an adjacent display panel 10.

[0045] In the splicing display device 1 of the present application, as Figure 4 and Figure 5 As shown, the protective structure 20 is arranged on two opposite side walls 11 of each display panel 10. The protective structure 20 includes at least one first structure 21 and at least one second structure 22 arranged on two opposite side walls 11 of the same display panel 10. The first structure 21 includes at least one protrusion 211, and the second structure 22 includes at least one groove 221. A protrusion 211 of two adjacent display panels 10 cooperates with a groove 221.

[0046] In this embodiment, wiring 12 and a protective structure 20 are provided on two opposing sidewalls 11 of the display panel 10. The protective structure 20 includes at least one first structure 21 and at least one second structure 22 provided on two opposing sidewalls 11 of the same display panel 10. In other words, the first structure 21 can be provided on one sidewall 11, and the second structure 22 can be provided on the other sidewall 11. Alternatively, the first structure 21 and the second structure 22 can be provided on one sidewall 11, and the first structure 21 and the second structure 22 can be provided on the other sidewall 11.

[0047] The first structure 21 and the second structure 22 have different shapes. The first structure 21 includes at least one protrusion 211 , that is, a surface of the first structure 21 away from the display panel 10 is non-planar, with part of the surface protruding relative to another part of the surface, thereby forming the protrusion 211 .

[0048] The second structure 22 includes at least one groove 221 , that is, a surface of the second structure 22 away from the display panel 10 is non-planar, and a portion of the surface is recessed relative to another portion of the surface to form the groove 221 .

[0049] like Figure 4 As shown, when the side walls 11 of two adjacent display panels 10 are brought close together, the first structure 21 of one display panel 10 can engage with the second structure 22 of the other display panel 10, i.e., the protrusion 211 of the first structure 21 fits into the groove 221 of the second structure 22. This arrangement prevents the wiring 12 of the two adjacent display panels 10 from colliding and being damaged. Furthermore, the engagement of the protrusion 211 with the groove 221 can help position the display panels 10, preventing vertical misalignment of the two adjacent display panels 10 during the splicing process.

[0050] The mating of protrusion 211 and recess 221 means that the shape of protrusion 211 corresponds to the shape of recess 221. After mating, protrusion 211 cannot move relative to recess 221 in the direction of the long side of sidewall 11. The shape of protrusion 211 can be regular, for example, protrusion 211 can be a rectangular parallelepiped, spherical, cylindrical, etc. The shape of protrusion 211 can also be irregular, for example, protrusion 211 can be formed into an irregular shape using a dispensing process. Protrusions 211 produced using a dispensing process are easy to process.

[0051] like Figure 4 As shown, in order to avoid increasing the seam width between two adjacent display panels 10 , the protrusion 211 and the groove 221 may abut against each other in the horizontal direction.

[0052] It should be understood that the number of grooves 221 and protrusions 211 can be set as needed, and it is only necessary to make the grooves 221 and the protrusions 211 correspond to each other. This application does not limit the number of grooves 221 and protrusions 211.

[0053] In this embodiment, if Figure 4 As shown, each first structure 21 includes a protrusion 211 , and each second structure 22 includes a groove 221 .

[0054] In this embodiment, if Figure 5 As shown, each first structure 21 includes two protrusions 211 , and each second structure 22 includes two grooves 221 .

[0055] Similarly, two or more first structures 21 may be provided on one side wall 11 of the display panel 10, and two or more second structures 22 may be provided on one side wall 11 of the display panel 10. The number of first structures 21 or second structures 22 on one side wall 11 may also be set as needed. When the number of first structures 21 and second structures 22 is large, the anti-collision effect is better.

[0056] In the splicing display device 1 of the present application, as Figure 4 and Figure 5 As shown, the first structures 21 are each disposed on one of the two opposing sidewalls 11 of the display panel 10, and the second structures 22 are each disposed on the other of the two opposing sidewalls 11 of the display panel 10. This allows for the fabrication of multiple first structures 21 on one sidewall 11 of the display panel 10, followed by the fabrication of multiple second structures 22 on the other sidewall 11 of the display panel 10. Because the protective structures 20 on the same sidewall 11 are identical, the fabrication process for the protective structures 20 can be simplified.

[0057] In the splicing display device 1 of the present application, as Figure 4 As shown, the length L1 of the mating protrusion 211 is equal to the length L2 of the groove 221, and the height H1 of the mating protrusion 211 is equal to the depth H2 of the groove 221. The length L1 of the protrusion 211 refers to the dimension of the protrusion 211 in the direction of the long side of the sidewall 11, and the length L2 of the groove 221 refers to the dimension of the groove 221 in the direction of the long side of the sidewall 11. The height H1 of the protrusion 211 refers to the dimension of the protrusion 211 in a plane perpendicular to the sidewall 11, and the depth H2 of the groove 221 refers to the dimension of the groove 221 in a plane perpendicular to the sidewall 11.

[0058] By setting the length L1 of the protrusion 211 and the length L2 of the groove 221 to be equal, the protrusion 211 can be prevented from moving relative to the groove 221 in the direction of the long side of the side wall 11, thereby improving the precision and stability of the splicing.

[0059] By setting the height H1 of the protrusion 211 and the depth H2 of the groove 221 to be equal, it is possible to avoid excessively increasing the width of the seam between two adjacent display panels 10 and reduce the impact of the protection structure 20 on the width of the seam.

[0060] In the splicing display device 1 of the present application, as Figure 4 and Figure 5 As shown, the first structure 21 includes a first substrate 212 and at least one protrusion 211 disposed on the first substrate 212 , and the second structure 22 includes a second substrate 222 and at least two bumps 223 disposed on the second substrate 222 , with a groove 221 formed between two adjacent bumps 223 .

[0061] In this embodiment, the materials of the first substrate 212 and the protrusion 211 can be the same or different. The materials of the second substrate 222 and the bump 223 can be the same or different.

[0062] Optionally, in order to reduce the difficulty of processing, the first substrate 212 , the protrusion 211 , the second substrate 222 , and the bump 223 may all be made of the same material.

[0063] Furthermore, the first substrate 212 and the second substrate 222 may have the same shape, and the protrusion 211 and the bump 223 may have the same shape.

[0064] For the first structure 21, the first substrate 212 includes at least one protrusion 211. The protrusion 211 is located in the middle of the first substrate 212, facilitating the mating of the protrusion 211 with the groove 221. For the second structure 22, at least two protrusions 211 are provided on the second substrate 222, forming at least one groove 221. The positions of the grooves 221 correspond to those of the protrusions 211, allowing the protrusions 211 to engage with the grooves 221 when two adjacent display panels 10 are joined.

[0065] The present application does not limit the number of the grooves 221 and the bumps 223 . Figure 4 The diagram shows a situation where one protrusion 211 is provided on the first substrate 212 and two bumps 223 are provided on the second substrate 222 . Figure 5 The figure shows a situation where two protrusions 211 are provided on the first substrate 212 and three bumps 223 are provided on the second substrate 222 . Figure 6 The diagram shows a case where three protrusions 211 are provided on the first substrate 212 and four bumps 223 are provided on the second substrate 222 .

[0066] In the splicing display device 1 of the present application, as Figure 6 As shown, the first structure 21 includes at least three protrusions 211 , and in the direction of the long side of the side wall 11 , at least two protrusions 211 have different lengths L1 .

[0067] like Figure 6 As shown, the protrusion includes a first protrusion 211a and a second protrusion 211b, and the length L1 of the first protrusion 211a is different from the length L1 of the second protrusion 211b. The groove includes a first groove 221a and a second groove 221b. The first protrusion 211a cooperates with the first groove 221a, and the second protrusion 211b cooperates with the second groove 221b. Correspondingly, the length of the first groove 221a is different from the length of the second groove 221b. Figure 7BAs shown, when two adjacent display panels 10 are misaligned in the vertical direction, the length L2 of the groove 221 does not match the length L1 of the protrusion after the misalignment, and thus cannot be smoothly engaged. The above arrangement can prevent splicing after misalignment and achieve a foolproof effect.

[0068] For comparison instructions, please refer to Figure 7A , Figure 7A FIG. 2 shows a situation where the lengths L1 of the two protrusions 211 are the same. Figure 7A As shown, when two adjacent display panels 10 are misaligned in the vertical direction, since the length L1 of the protrusions 211 is the same, the protrusions 211 can engage with any groove 221. After the display panels 10 are misaligned, the protrusions 211 can still engage with the misaligned grooves 221.

[0069] In the splicing display device 1 of the present application, as Figure 3 As shown, the display panel 10 includes a substrate 13 and a display layer 14 disposed on one side surface of the substrate 13 . The elastic modulus of the protective structure 20 is less than or equal to the elastic modulus of the substrate 13 .

[0070] The substrate 13 may be a rigid substrate 13 or a flexible substrate 13. The material of the rigid substrate 13 includes glass, etc. The material of the flexible substrate 13 includes polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyarylate, or glass fiber reinforced plastic, etc.

[0071] The display layer 14 is used to display images and may include multiple light-emitting units. These light-emitting units may be OLEDs, Mini-LEDs, Micro-LEDs, or the like. The surface on which the display layer 14 is provided serves as the front surface of the display panel 10, while the surface of the substrate 13 facing away from the display layer 14 serves as the back surface of the display panel 10. The display layer 14 is connected to the traces 12, through which the driver chip 15 and the flexible circuit board 16 transmit drive signals to the display layer 14, thereby driving the display layer 14 to display images.

[0072] In this embodiment, the elastic modulus of the protective structure 20 is less than or equal to the elastic modulus of the substrate 13. When the elastic modulus is small, the protective structure 20 is more likely to deform, absorbing the impact of a collision and preventing damage to the display panel 10. For example, the protective structure 20 can be made of a plastic material, which can deform under stress and is less likely to break.

[0073] In the spliced display device 1 of the present application, the material of the protective structure 20 is any one of silicone, resin glue, glass glue, silver paste, solder paste, and glass.

[0074] In this embodiment, the spliced display device 1 can be any product or component with a display function, such as a television, a monitor, or an advertising screen.

[0075] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0076] The splicing display device 1 provided in the embodiment of the present application is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A splicing display device, characterized in that: The device comprises at least two spliced display panels, wherein the display panel comprises: a wiring, provided on at least one side wall of the display panel; A protective structure, disposed on the same side wall of the display panel as the wiring; The protective structure of one display panel is arranged in contact with the protective structure or side wall of another display panel, and the maximum height of the protective structure is greater than the maximum height of the wiring arranged on the same side wall as the protective structure.

2. The splicing display device according to claim 1, characterized in that: The protective structure is arranged on the two opposite side walls of each display panel, and the protective structure includes at least one first structure and at least one second structure arranged on the two opposite side walls of the same display panel, the first structure includes at least one protrusion, and the second structure includes at least one groove, and one protrusion of the two adjacent display panels cooperates with one groove.

3. The splicing display device according to claim 2, characterized in that: The first structures are each disposed on one of the two opposite side walls of the display panel, and the second structures are each disposed on the other of the two opposite side walls of the display panel.

4. The splicing display device according to claim 2, characterized in that: The length of the mutually fitting protrusions is equal to the length of the groove, and the height of the mutually fitting protrusions is equal to the depth of the groove.

5. The splicing display device according to claim 2, wherein: The first structure includes a first substrate and at least one protrusion disposed on the first substrate. The second structure includes a second substrate and at least two bumps disposed on the second substrate. The groove is formed between two adjacent bumps.

6. The splicing display device according to claim 5, characterized in that: The first structure includes at least three protrusions, and at least two of the protrusions have different lengths in the direction of the long side of the side wall.

7. The splicing display device according to claim 1, characterized in that: The display panel includes a substrate and a display layer disposed on a surface of one side of the substrate. The elastic modulus of the protective structure is less than or equal to the elastic modulus of the substrate.

8. The splicing display device according to claim 1, characterized in that: The material of the protective structure is any one of silica gel, resin glue, glass glue, silver paste, solder paste, and glass.

9. The spliced display device according to any one of claims 1 to 8, characterized in that: The wiring is arranged in a middle area of the side wall, the protective structure is arranged in two edge areas of the side wall, and the middle area and the edge areas are arranged along the direction of the long side of the side wall.

10. The splicing display device according to claim 9, characterized in that: An orthographic projection of the protective structure on the side wall is located inside the side wall.

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