Backlight module, preparation method thereof and display panel

Abstract

Embodiments of the present application provide a backlight module, a preparation method thereof and a display panel. The backlight module comprises a back plate, a lamp plate arranged on one side of the back plate, and a backlight film arranged on a side of the lamp plate away from the back plate. The backlight film and the lamp plate are coincident with the back plate in orthographic projection. By arranging the orthographic projection of the lamp plate and the backlight film on the back plate to be coincident with the back plate, that is, arranging the periphery of the lamp plate and the backlight film to be flush with the back plate, the tolerance of the assembly between the lamp plate and the backlight film can be reduced or avoided, the phenomenon of edge blue caused by misalignment of the backlight film and the lamp plate can be reduced, the visual effect and display effect of the edge of the backlight module can be improved, and thus the picture quality of the display panel is improved. Furthermore, the back plate is flush with the edges of the lamp plate and the backlight film, and compared with a back plate of a bending shape, the process can be accelerated.

Description

Technical Field

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

[0002] Mini light-emitting diodes (MLEDs) have advantages such as small size, long lifespan, and high efficiency as light sources. They can be used continuously for up to 100,000 hours. MLED technology has great potential to become one of the development directions of next-generation display technology.

[0003] MLEDs can be used for both backlighting and direct display. When used as backlights, MLEDs are commonly found in Liquid Crystal Displays (LCDs). An LCD is constructed by placing a liquid crystal cell between two parallel glass substrates. Thin-film transistors (TFTs) are located on the lower substrate, while color filters are located on the upper substrate. By changing the signals and voltages on the TFTs, the rotation direction of the liquid crystal molecules is controlled, thereby controlling whether polarized light is emitted from each pixel to achieve the display purpose. Compared to traditional LED backlight modules, MLEDs used as backlights employ a denser chip arrangement to reduce the light mixing distance, resulting in an ultra-thin light source module.

[0004] However, in existing MLED backlight display panels, due to the large amount of backlight film material and the assembly tolerances between the lamp board and the backlight film, the visual effect and display effect of the backlight module edge are affected. Summary of the Invention

[0005] This application provides a backlight module, its manufacturing method, and a display panel, which reduces the assembly tolerance between the lamp board and the backlight film, improves the visual and display effects of the backlight module edges, and thereby enhances the picture quality of the display panel.

[0006] In a first aspect, embodiments of this application provide a backlight module, including:

[0007] Back panel;

[0008] A light panel is disposed on one side of the back panel; and

[0009] A backlight film is disposed on the side of the lamp panel opposite to the back plate;

[0010] The backlight film and the lamp panel are projected onto the back panel in a way that coincides with the back panel.

[0011] Optionally, the back plate, the lamp plate, and the backlight film form a stacked structure, the stacked structure having four opposite ends;

[0012] The backlight module also includes:

[0013] A connecting plate is disposed at at least one end of the laminated structure, the connecting plate being used to connect the end of the back plate, the end of the lamp plate, and the end of the backlight film on the same side.

[0014] Optionally, the connecting plate includes:

[0015] Side panels are attached to the side walls of the laminated structure;

[0016] The top plate is bent and connected to the side plate, and is attached to the top wall of the laminated structure;

[0017] The bottom plate is bent and connected to the side plate, is disposed opposite to the top plate, and is attached to the bottom wall of the laminated structure.

[0018] Optionally, both the top plate and the bottom plate extend in a horizontal direction perpendicular to the stacking direction of the laminated structure, and the lengths of the top plate and the bottom plate in the horizontal direction are equal.

[0019] Optionally, in the horizontal direction, the length of the top plate accounts for a proportion of the length of the laminated structure within the range of 0.1; and / or

[0020] The length of the base plate is in the range of 0.1% of the length of the laminated structure.

[0021] Optionally, a bonding adhesive is provided between the connecting plate and the laminated structure.

[0022] Secondly, embodiments of this application also provide a display panel, including:

[0023] Backlight module as described in any of the preceding items;

[0024] The display module is located on one side of the backlight module.

[0025] Thirdly, embodiments of this application also provide a method for fabricating a backlight module, comprising:

[0026] The back panel substrate, the lamp panel substrate, and the backlight film substrate are sequentially stacked to form a laminated substrate.

[0027] The periphery of the laminated substrate is cut along the lamination direction to form a laminated structure including a back panel, a lamp panel, and a backlight film, wherein the projection of the backlight film and the lamp panel onto the back panel coincides with the back panel.

[0028] Optionally, the method further includes cutting the periphery of the laminated substrate along the lamination direction to form a laminated structure comprising a backplate, a lamp plate, and a backlight film. After the backlight film and the lamp plate are aligned with the orthographic projection of the backplate, the preparation method further includes:

[0029] A connecting plate is provided at at least one end of the laminated structure to connect the end of the back plate, the end of the lamp plate, and the end of the backlight film on the same side.

[0030] Optionally, the provision of a connecting plate at at least one end of the laminated structure to connect the ends of the back panel, the lamp panel, and the backlight film on the same side includes:

[0031] A plate is provided at at least one end of the laminated structure;

[0032] The two ends of the sheet are bent to form the connecting plate, which includes a top plate, a side plate and a bottom plate connected in sequence. The top plate is attached to the top wall of the laminated structure, the side plate is attached to the side wall of the laminated structure and the bottom plate is attached to the bottom wall of the laminated structure.

[0033] In the backlight module, its manufacturing method, and display panel of this application embodiment, by setting the orthogonal projection of the lamp board and the backlight film onto the back plate to coincide with the back plate, that is, by setting the periphery of the lamp board and the backlight film flush, the assembly tolerance between the lamp board and the backlight film can be reduced or avoided, the phenomenon of edge bluing caused by misalignment of the backlight film and the lamp board can be reduced, the visual effect and display effect of the backlight module edge can be improved, thereby enhancing the picture quality of the display panel; furthermore, the back plate is also flush with the edge of the lamp board and the backlight film, which can speed up the process compared to a bent back plate. Attached Figure Description

[0034] 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.

[0035] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0036] Figure 1 This is a schematic diagram of the structure of the display panel provided in an embodiment of this application.

[0037] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the display panel along line AA.

[0038] Figure 3 This is a schematic diagram of a first structure of a backlight module provided in an embodiment of this application.

[0039] Figure 4 This is a schematic diagram of a second structure of the backlight module provided in an embodiment of this application.

[0040] Figure 5 for Figure 4 The diagram shows a cross-sectional view of the backlight module along the BB.

[0041] Figure 6 This is a schematic flowchart illustrating the fabrication method of the backlight module provided in the embodiments of this application. Detailed Implementation

[0042] 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 them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0043] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the display panel provided in an embodiment of this application. Figure 2 for Figure 1 The diagram shows a cross-sectional view of the display panel along line AA. The display panel 1 includes a display module 10 and a backlight module 20, which are stacked together. For example, the display panel 1 has a light-emitting side, and the display module 10 is positioned on the side of the backlight module 20 facing the light-emitting side. For instance, the display panel 1 is a liquid crystal display panel, also known as an LCD. An LCD is constructed by placing a liquid crystal cell between two parallel glass substrates. Thin-film transistors (TFTs) are disposed on the lower glass substrate, and color filters are disposed on the upper glass substrate. The rotation direction of the liquid crystal molecules is controlled by changing the signals and voltages on the TFTs, thereby controlling whether polarized light is emitted from each pixel to achieve the display purpose. The image is formed by combining the light emitted from the backlight. The display module 10 consists of the aforementioned upper glass substrate and its color filter, the lower glass substrate and its TFTs, and the liquid crystal cell between them. The backlight module 20 provides a backlight for the display module 10, and the light source of the backlight module 20 can be an MLED.

[0044] MLED technology has great potential to become one of the directions for the development of next-generation display technologies. With the introduction of MLED technology in mid-to-high-end tablets and laptops, the dark-state display effect of LTPS (Low Temperature Poly-silicon)-LCD products has been greatly improved. Compared with OLED (Organic Light-Emitting Diode), although there is still room for improvement in thickness and response time, MLED has significant advantages in power consumption, HDR (High Dynamic Range Imaging) standards, CR (Constant Radio Frequency), brightness, and product reliability. However, due to the large number of backlight film materials and the tolerances in the assembly between the lamp board and the backlight film, the visual effect and display effect at the edges of the backlight module are affected.

[0045] To improve the above situation, the structure of the backlight module 20 has been improved in this application embodiment. The following will describe the structure and preparation method of the backlight module 20.

[0046] Please combine Figure 1 and Figure 2 And see Figure 3 As shown, Figure 3 This is a schematic diagram of a first structure of a backlight module provided in an embodiment of this application. The backlight module 20 includes a back plate 21, a lamp plate 22, and a backlight film 23. The lamp plate 22 is disposed on one side of the back plate 21, and the backlight film 23 is disposed on the side of the lamp plate 22 opposite to the back plate 21. The orthographic projections of the backlight film 23 and the lamp plate 22 onto the back plate 21 coincide with the back plate 21.

[0047] In the backlight module 20 provided in this application embodiment, by setting the orthographic projection of the lamp board 22 and the backlight film 23 onto the back plate 21 to coincide with the back plate 21, that is, by setting the periphery of the lamp board 22 and the backlight film 23 to be flush, the assembly tolerance between the lamp board 22 and the backlight film 23 can be reduced or avoided, the phenomenon of edge bluing caused by misalignment of the backlight film 23 and the lamp board 22 can be reduced, the visual effect and display effect of the edge of the backlight module 20 can be improved, thereby enhancing the picture quality of the display panel 1; in addition, the back plate 21 is also flush with the edges of the lamp board 22 and the backlight film 23, which can speed up the process compared to a bent back plate.

[0048] The backplate 21 is a supporting or load-bearing device for the backlight module 20. The backplate 21 can be made of a rigid metal material to ensure that it has sufficient strength and support. For example, the backplate 21 can be made of steel plate or aluminum plate.

[0049] The lamp board 22 is the main light-emitting unit of the backlight module 20. The lamp board 22 may include a lamp holder and light-emitting chips disposed thereon. The light-emitting chips are arranged in an array on the lamp holder, and the light-emitting chips may be MLED chips. The lamp board 22 is mounted on the back plate 21, for example, by means of back plate adhesive.

[0050] The backlight film 23 determines the overall performance of the backlight module 20. The brightness enhancement film with a prismatic microstructure effectively improves illumination brightness, uniformity, and image contrast, and indirectly improves the power consumption of the backlight module. Under a given light source output, the front-view brightness, or axial brightness, of the liquid crystal module is improved through the prism film, reflective polarizer, and high-reflectivity reflective film. Without increasing the number of light sources, there are two ways to improve axial brightness: first, improve the angular distribution of light, concentrating the light at the front-view angle; second, reduce losses and increase the total luminous flux. The backlight film 23 can perform light mixing to ensure uniform light dispersion; the backlight film 23 can also convert blue light into white light, etc.

[0051] In the existing technology, due to the cutting tolerance and assembly tolerance between the lamp board and the backlight film, the edges of the backlight module are not aligned, which can easily lead to defects such as blue edges and dark edges.

[0052] Please combine Figures 1 to 3 And see Figure 4 and Figure 5 As shown, Figure 4 This is a schematic diagram of a second structure of the backlight module provided in an embodiment of this application. Figure 5 for Figure 4 The diagram shows a cross-sectional view of the backlight module along the BB axis. To address the aforementioned issues, this embodiment of the application cuts the edges of the backlight module 20 as a whole to reduce the tolerance gap between the backlight film 23 and the lamp panel 22. Exemplarily, the back panel 21, lamp panel 22, and backlight film 23 form a stacked structure 26, meaning the back panel 21, lamp panel 22, and backlight film 23 are integrated as a single unit. The stacked structure 26 has four pairs of opposite ends 260. It is understood that the back panel 21, lamp panel 22, and backlight film 23 can all be rectangular or square; therefore, stacking and overlapping them yields four pairs of opposite ends 260.

[0053] The backlight module 20 also includes a connecting plate 24, which is disposed at at least one end 260 of the stacked structure 26. The connecting plate 24 is used to connect the end of the back plate 21, the end of the lamp plate 22 and the end of the backlight film 23 on the same side.

[0054] For example, the connecting plate 24 can be made of metal to enhance the connection strength at the ends of the laminated structure 26. For instance, the connecting plate 24 can be made of the same material as the back plate 21, such as steel or aluminum. The thickness of the connecting plate 24 can be the same as the thickness of the back plate 21; of course, a set error range, such as within 5%, can also be considered as having the same thickness. In the prior art, the back plate is usually bent to cover the lamp panel and backlight film. Uneven back plate placement can lead to insufficient overall strength of the backlight module. In this embodiment, the connecting plate 24 can be understood as a small connecting component separated from the back plate, which can both improve the overall strength of the backlight module 20 and improve the overall optical quality of the edges.

[0055] The connecting plate 24 can partially cover the laminated structure 26 to ensure a tight connection between the back plate 21, lamp plate 22, and backlight film 23 in the laminated structure 26, thereby improving the overall strength of the backlight module 20. For example, the connecting plate 24 includes a side plate 240, a top plate 241, and a bottom plate 242. The side plate 240 is attached to the side wall 261 of the laminated structure 26; the top plate 241 is bent and connected to the side plate 240 and is attached to the top wall 262 of the laminated structure 26; the bottom plate 242 is bent and connected to the side plate 240, is positioned opposite to the top plate 241, and is attached to the bottom wall 263 of the laminated structure 26. It is understood that the connecting plate 24 is U-shaped, with the U-shaped opening engaging at the end 260 of the laminated structure 26.

[0056] A connecting adhesive 25 is provided between the connecting plate 24 and the stacked structure 26. The connecting adhesive 25 can fill the space between the connecting plate 24 and the stacked structure 26, serving as a buffer and connection, making the connection between the connecting plate 24 and the stacked structure 26 reliable and enhancing the stability of the backlight module 20.

[0057] For example, the connecting plate 24 can be provided at only one of the four ends 260 of the laminated structure 26. The back plate 21, the lamp plate 22, and the backlight film 23 are stacked along the stacking direction Y. The top plate 241 and the bottom plate 242 in the connecting plate 24 extend along the horizontal direction X, which is perpendicular to the stacking direction Y of the laminated structure 26. The lengths of the top plate 241 and the bottom plate 242 in the horizontal direction X are equal. However, this equality is not absolute. Due to manufacturing errors, the error between the lengths of the top plate 241 and the bottom plate 242 can be considered equal if the error is within a set error range, such as 5%. Of course, the lengths of the top plate 241 and the bottom plate 242 can also be unequal. For example, the length of the bottom plate 242 can be greater than the length of the top plate 241. This can increase the stability of the laminated structure 26 under load.

[0058] The connecting plate 24 is disposed at the end 260 of the stacked structure 26. In the horizontal direction X, the length of the top plate 241 is in the range of 0.1 of the length of the stacked structure 26, and / or the length of the bottom plate 242 is in the range of 0.1 of the length of the stacked structure 26. For example, when the length of the stacked structure 26 is 100 cm, the length of the top plate 241 is 10 cm, which can enhance the overall strength of the backlight module 20 without affecting the display of the light source in the lamp panel 22.

[0059] For example, two connecting plates 24 can be provided at two of the four ends 260 of the laminated structure 26. The two ends 260 can be adjacent ends 260 or opposite ends 260. Taking two opposite ends 260 as an example, the two connecting plates 24 can be symmetrically arranged with respect to the center line of the laminated structure 26 along the stacking direction Y, that is, two U-shaped plates are arranged opposite each other and the U-shaped openings are opposite each other. Compared with the setting of a single connecting plate 24, the stability of the backlight module 20 can be enhanced. Taking the laminated structure 26 having an upper end, a lower end, a left end, and a right end as an example, the connecting plates 24 can be provided at the upper end and the left end or the right end respectively, or the connecting plates 24 can be provided at the left end and the right end respectively.

[0060] For example, three connecting plates 24 can be provided at three of the four ends 260 of the laminated structure 26, with two of the three ends 260 facing each other and the other end 260 adjacent to the two facing ends 260. Taking the laminated structure 26 having an upper end, a lower end, a left end, and a right end as an example, connecting plates 24 can be provided at the upper end, the left end, and the right end respectively, leaving the lower end unused to facilitate the arrangement of the backlight module 20's wiring, etc.

[0061] To more clearly illustrate the structural composition of the backlight module 20 in the embodiments of this application, the following will describe it from the perspective of the preparation method of the backlight module.

[0062] For example, please refer to Figures 1 to 5 And see Figure 6 As shown, Figure 6 This is a schematic flowchart illustrating the fabrication method of a backlight module provided in an embodiment of this application. An embodiment of this application provides a method for fabricating a backlight module, comprising:

[0063] 101. The back panel substrate, the lamp panel substrate, and the backlight film substrate are stacked in sequence to form a laminated substrate.

[0064] In the process of manufacturing a backlight module, the first step is to provide pre-made backplate substrate, lamp board substrate, and backlight film substrate. "Pre-made" here means that the substrates only need to be cut to the required dimensions. For example, for the lamp board substrate, the MLED chip has already been installed onto the lamp holder. Similarly, for the backlight film substrate, multiple film layers have been stacked and bonded together.

[0065] The aforementioned substrates can be stacked vertically. In the vertical direction, the back panel substrate, the lamp panel substrate, and the backlight film substrate are stacked sequentially to form a stacked substrate.

[0066] 102. Cut the periphery of the laminated substrate along the lamination direction to form a laminated structure including a back panel, a lamp panel and a backlight film, and make the orthographic projection of the backlight film and the lamp panel on the back panel coincide with the back panel.

[0067] The periphery of the laminated substrate is cut along the lamination direction to form a laminated structure with neat edges. The cut laminated structure includes a back panel, a light panel, and a backlight film stacked in sequence. The orthographic projection of the backlight film and the light panel on the back panel coincides with the back panel.

[0068] It should be noted that in existing technologies, the lamp board and backlight film are typically assembled, and then attached to a backing board using backing adhesive. The periphery of the backing board is then bent to cover the lamp board and backlight film. This arrangement of the backlight module can easily lead to large assembly tolerances for the lamp board and backlight film, thus affecting the edge appearance of the backlight module. To improve upon this, the embodiments of this application uniformly cut the stacked substrates to ensure that the edges of the lamp board and backlight film are flush, thereby improving the edge display effect of the backlight module. Furthermore, the backing board is also cut together with the lamp board and backlight film, which can save process steps and accelerate the preparation of the backlight module.

[0069] 103. A connecting plate is provided at at least one end of the laminated structure to connect the end of the back panel, the end of the lamp panel and the end of the backlight film on the same side.

[0070] The laminated structure can have four opposite ends. In order to tightly connect the back panel, lamp panel and backlight film in the laminated structure, a connecting plate can be provided at at least one end of the laminated structure to connect the end of the back panel, the end of the lamp panel and the end of the backlight film on the same side.

[0071] The connecting plate can be a U-shaped structure, with the U-shaped opening snapping into at least one end of the laminated structure. The connecting plate can include side plates, a top plate, and a bottom plate. The side plates can be vertically arranged, and the top and bottom plates are opposite each other and extend in a parallel direction. The top and side plates are bent together, and the bottom and side plates are also bent together. During the manufacturing process, a plate can be placed at at least one end of the laminated structure. The two ends of the plate are bent to form a connecting plate including a top plate, side plates, and a bottom plate connected in sequence. The top plate is attached to the top wall of the laminated structure, the side plates are attached to the side walls of the laminated structure, and the bottom plate is attached to the bottom wall of the laminated structure.

[0072] A connecting plate can be set at one end of the laminated structure, or two connecting plates can be set at both ends of the laminated structure, or three connecting plates can be set at three ends of the laminated structure. When multiple connecting plates are set, the multiple connecting plates can be manufactured in the same way and installed at the ends of the laminated structure at the same time.

[0073] In this process, adhesive can be used to fill the gap between the stacked structure and the connecting plate. The adhesive acts as a buffer and connector to improve the overall strength and stability of the backlight module.

[0074] In the backlight module manufacturing method provided in this application embodiment, by setting the orthogonal projection of the lamp board and backlight film onto the back plate to coincide with the back plate, that is, by setting the periphery of the lamp board and backlight film flush, the assembly tolerance between the lamp board and backlight film can be reduced or avoided, reducing the edge bluing phenomenon caused by misalignment of the backlight film and lamp board, improving the visual effect and display effect of the backlight module edge, thereby enhancing the picture quality of the display panel; furthermore, the back plate is also flush with the edge of the lamp board and backlight film, which can speed up the process compared to a bent back plate. In this application embodiment, by stacking the entire back plate together with the lamp board and backlight film, and cutting it as a whole with a die, the tolerance gap between the backlight film and lamp board is reduced. Then, the bottom back plate and the top backlight film are attached together with a U-shaped connecting plate and double-sided adhesive, which can not only improve the overall strength of the backlight module, but also improve the overall optical quality of the edge.

[0075] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0076] In the description of this application, 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. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0077] The backlight module, its preparation method, and display panel provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A backlight module, characterized in that, The backlight module comprises: a back plate; a lamp plate arranged on one side of the back plate; and a backlight film arranged on a side of the lamp plate away from the back plate; wherein the backlight film and the lamp plate are in the same projection as the back plate, and the back plate, the lamp plate and the backlight film form a laminated structure having four end portions opposite to each other; the backlight module further comprises: a connecting plate arranged on at least one end portion of the laminated structure, the connecting plate being used to connect the end portion of the back plate, the end portion of the lamp plate and the end portion of the backlight film on the same side. The connecting plate comprises:

2. The backlight module of claim 1, wherein, a side plate attached to a side wall of the laminated structure; a top plate connected to the side plate by bending and attached to a top wall of the laminated structure; a bottom plate connected to the side plate by bending, arranged opposite to the top plate and attached to a bottom wall of the laminated structure. The top plate and the bottom plate both extend in a horizontal direction perpendicular to the laminating direction of the laminated structure, and the length of the top plate and the length of the bottom plate in the horizontal direction are equal.

3. The backlight module of claim 2, wherein, In the horizontal direction, the length of the top plate accounts for a proportion of the length of the laminated structure within the range of 0.1; and / or 4. The backlight module of claim 2, wherein, the length of the bottom plate accounts for a proportion of the length of the laminated structure within the range of 0.

1. A connecting glue is arranged between the connecting plate and the laminated structure.

5. The backlight module of claim 1, wherein, The backlight module comprises:

6. A display panel, characterized by, any one of claims 1-5; a display module arranged on one side of the backlight module. The backlight module comprises:

7. A method for manufacturing a backlight module, characterized in that, stacking a back plate substrate, a lamp plate substrate and a backlight film substrate in sequence to form a laminated substrate; cutting the periphery of the laminated substrate in the laminating direction to form a laminated structure comprising a back plate, a lamp plate and a backlight film, the backlight film and the lamp plate being in the same projection as the back plate; arranging a connecting plate on at least one end portion of the laminated structure to connect the end portion of the back plate, the end portion of the lamp plate and the end portion of the backlight film on the same side. The arrangement of the connecting plate on at least one end portion of the laminated structure to connect the end portion of the back plate, the end portion of the lamp plate and the end portion of the backlight film on the same side comprises:

8. The preparation method according to claim 7, characterized in that, arranging a plate on at least one end portion of the laminated structure; bending both ends of the plate and forming the connecting plate comprising a top plate, a side plate and a bottom plate connected in sequence, the top plate being attached to a top wall of the laminated structure, the side plate being attached to a side wall of the laminated structure, and the bottom plate being attached to a bottom wall of the laminated structure. ​

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