Display device, assembly method and assembly tool

Abstract

Embodiments of the present application provide a display device, an assembling method and an assembling tool. The assembling method of the display device comprises: providing a middle frame and a cover plate, the middle frame comprising a plurality of first connecting portions and a plurality of second connecting portions, one first connecting portion connecting two second connecting portions; applying first glue on each first connecting portion; applying second glue on each second connecting portion; covering the cover plate on the middle frame and bonding the cover plate with the first glue and the second glue; the first glue solidifies to form a first glue body at the first connecting portion, the second glue solidifies to form a second glue body at the second connecting portion, the first glue body is connected with the second glue body, and the bonding strength of one of the first glue body and the second glue body is greater than that of the other. The embodiments of the present application can reduce the occupation of the space of the middle frame, thereby improving the screen-to-body ratio of the display device. Moreover, the strength of one of the first glue body and the second glue body is large, which can increase the stability of the fixed connection of the cover plate and the middle frame.

Description

Technical Field

[0001] This application relates to the field of display device technology, and more particularly to a display device, assembly method, and assembly tool. Background Technology

[0002] With the development of technology, users' demands for display device functions are gradually increasing. Display devices generally have a display screen and a cover plate covering the display screen. For example, mobile phones, tablets and other display devices all have a display screen and a cover plate covering the display screen.

[0003] In related technologies, a cover plate is placed over the display surface of the screen. To ensure the stability of the connection between the screen and the cover plate, the screen and the cover plate can be fixedly connected to the mid-frame of the display device using a connecting structure. For example, the screen and the cover plate can be fixedly connected to the mid-frame using adhesive or plastic parts. However, plastic parts will occupy additional space in the display device used to assemble the screen, resulting in a reduction in the screen-to-body ratio of the display device. Summary of the Invention

[0004] This application provides a display device, an assembly method, and an assembly tool, which improve the screen-to-body ratio of the display device.

[0005] This application provides a method for assembling a display device, including:

[0006] A middle frame and a cover plate are provided, the middle frame including a plurality of first connecting parts and a plurality of second connecting parts, wherein one first connecting part connects two second connecting parts;

[0007] Apply the first adhesive to each of the first connecting parts;

[0008] Apply a second adhesive to each of the second joints;

[0009] The cover plate is placed on the middle frame and bonded to the first adhesive and the second adhesive; the first adhesive solidifies at the first connection to form a first colloid, and the second adhesive solidifies at the second connection to form a second colloid. The first colloid and the second colloid are connected, and the adhesive strength of one of the first colloid and the second colloid is greater than that of the other.

[0010] This application embodiment also provides a display device, including:

[0011] The middle frame includes a first connecting part and a second connecting part that are connected to each other, wherein the width of the first connecting part is greater than the width of the second connecting part;

[0012] A first colloid, wherein the first colloid is disposed on the first connecting portion;

[0013] The second colloid is disposed on the second connecting part, and the adhesive strength of the first colloid is greater than the adhesive strength of the second colloid.

[0014] A cover plate is placed on the middle frame and is fixedly connected to the middle frame by the second adhesive and the first adhesive.

[0015] This application embodiment also provides an assembly tool for a display device, wherein the display device is any of the display devices described above, and the assembly tool includes:

[0016] A first valve body, the first valve body being filled with a first adhesive for applying a first connecting portion to the middle frame; and

[0017] The second valve body is filled with a second adhesive for applying to the second connection portion of the middle frame.

[0018] In this embodiment of the display device, the cover plate is directly fixed to the middle frame via a first adhesive and a second adhesive. Compared to using additional plastic parts to fix the cover plate to the middle frame, this reduces the space occupied by the middle frame, thereby increasing the screen-to-body ratio of the display device. Furthermore, the fact that one of the first and second adhesives has high strength in this embodiment increases the stability of the fixed connection between the cover plate and the middle frame. Attached Figure Description

[0019] 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 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.

[0020] 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, wherein the same reference numerals in the following description denote the same parts.

[0021] Figure 1 This is a schematic flowchart illustrating the assembly method of the display device provided in the embodiments of this application.

[0022] Figure 2 This is a schematic diagram showing the state of the adhesive in the display device provided in the embodiments of this application.

[0023] Figure 3 for Figure 2 A schematic diagram showing the interaction between the colloid, cover plate, and middle frame.

[0024] Figure 4 This is a schematic diagram of the structure of the display device provided in the embodiments of this application.

[0025] Figure 5 A perspective view of a display device provided in an embodiment of this application.

[0026] Figure 6 This is a schematic diagram of the structure of the middle frame in the display device provided in the embodiment of this application.

[0027] Figure 7 for Figure 6 An enlarged view of part B shown.

[0028] Figure 8 This is a first structural schematic diagram of the first colloid and the second colloid in the display device provided in the embodiments of this application.

[0029] Figure 9 This is a schematic diagram of the second structure of the first colloid and the second colloid in the display device provided in the embodiments of this application.

[0030] Figure 10 This is a schematic diagram of the third structure of the first colloid and the second colloid in the display device provided in the embodiments of this application.

[0031] Figure 11 This is a schematic diagram of the structure of the cover plate in the display device provided in the embodiment of this application. Detailed Implementation

[0032] 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 protection scope of this application.

[0033] Display devices generally have a display screen and a cover plate covering the display screen. For example, mobile phones and tablet computers all have a display screen and a cover plate covering the display screen. In related technologies, the cover plate covers the display surface of the display screen. In order to ensure the connection stability between the display screen and the cover plate, the display screen and the cover plate can be fixedly connected to the middle frame of the display device by a connection structure.

[0034] However, to maintain the same screen-to-body ratio, the width of the bonding area between the cover plate and the mid-frame must not exceed 0.6 mm. This width is insufficient to simultaneously apply two types of adhesive without the adhesive overflowing and pressing into the display module. When only PUR adhesive (moisture-curing reactive polyurethane hot melt adhesive) is applied around the entire circumference between the cover plate and the mid-frame, the screen's relative movement during a drop at an angle of 45 to 90 degrees can cause the moisture-curing reactive polyurethane hot melt adhesive to peel off and damage the display module. Applying AB structural adhesive (two-component acrylate) around the entire circumference between the cover plate and the mid-frame reduces screen movement during drops, minimizing damage. However, AB adhesive currently cannot achieve a uniform, smooth surface after wiping. Therefore, to ensure a stable connection between the cover plate and the mid-frame while achieving a uniform, smooth surface, the added adhesive or plastic components will occupy additional space used for the display screen assembly, reducing the screen-to-body ratio.

[0035] Therefore, this embodiment provides a method for assembling a display device, in which multiple first connecting parts and multiple second connecting parts are provided on the mid-frame, and two adjacent first connecting parts are connected to the second connecting parts. The width of each first connecting part is greater than the width of each second connecting part. A first adhesive is applied to the first connecting parts, and a second adhesive is applied to the second connecting parts. By applying the first and second adhesives locally, no additional plastic parts are needed, reducing the space occupied by the mid-frame and thus improving the screen-to-body ratio of the display device. A detailed description is provided below with reference to the accompanying drawings.

[0036] Please see Figure 1 , Figure 1 This is a schematic flowchart illustrating the assembly method of the display device provided in the embodiments of this application.

[0037] 101. A middle frame and a cover plate are provided, the middle frame including a plurality of first connecting parts and a plurality of second connecting parts, wherein one first connecting part connects two second connecting parts.

[0038] The middle frame and the cover plate are connected by a first connecting part and a second connecting part.

[0039] 102. Apply the first adhesive to each of the first joints.

[0040] The first adhesive can be a type of adhesive with strong bonding ability, or it can be an adhesive with a good smoothness after solidification and polishing.

[0041] 103. Apply the second adhesive to each of the second joints.

[0042] The second adhesive can be a type of adhesive with strong bonding ability, or an adhesive that has a good smoothness after solidification and polishing.

[0043] 104. Place the cover plate on the middle frame and bond the cover plate to the first adhesive and the second adhesive; the first adhesive solidifies at the first connection to form a first colloid, the second adhesive solidifies at the second connection to form a second colloid, the first colloid and the second colloid are connected, and the bonding strength of one of the first colloid and the second colloid is greater than that of the other.

[0044] It is understood that the first adhesive and the second adhesive can be different adhesives. In some embodiments, the adhesive strength of the first adhesive is greater than that of the second adhesive, and the smoothness of the second adhesive is greater than that of the first adhesive. In other embodiments, the adhesive strength of the first adhesive is less than that of the second adhesive, and the smoothness of the second adhesive is less than that of the first adhesive.

[0045] It should be noted that the width of the adhesive with higher bonding strength is greater than the width of the adhesive with lower bonding strength. This is because increasing the width of the adhesive with higher bonding strength increases the contact area between the adhesive and the cover plate and the mid-frame, resulting in a stronger bond between the cover plate and the mid-frame without increasing the space occupied by the adhesive in the mid-frame. For example, in some embodiments, the bonding strength of the first adhesive is greater than that of the second adhesive, so the width of the second adhesive is smaller than the width of the first adhesive. In other embodiments, the bonding strength of the first adhesive is less than that of the second adhesive, so the width of the second adhesive is greater than the width of the first adhesive.

[0046] The width of the first colloid is a first distance between the edge of the first colloid near the window and the edge of the first colloid away from the window, and the width of the second colloid is a second distance between the edge of the second colloid near the window and the edge of the second colloid away from the window. The width of the first colloid is greater than the width of the second colloid, that is, the first distance is greater than the second distance.

[0047] Specifically, this embodiment uses a two-component acrylic structural adhesive (AB glue) as the first adhesive and a moisture-curing reactive polyurethane hot melt adhesive (PUR glue) as the second adhesive for illustration. The width of the first adhesive can be 0.8 mm, and the width of the second adhesive can be 0.38 mm.

[0048] AB glue is a highly efficient and environmentally friendly adhesive, consisting of a main agent and a curing agent. AB glue boasts advantages such as high modulus, low deformation, high bond strength, and good chemical resistance. The first layer of adhesive minimizes the movement of the cover plate relative to the mid-frame during a drop. In the event of a steep drop, the first layer of adhesive can tighten the cover plate and mid-frame, reducing the risk of screen damage.

[0049] PUR adhesive possesses excellent adhesion to paper fibers, good resistance to extreme cold and heat, long shelf life, good extensibility, and ease of wiping. Its mechanism of action involves the reaction of polyurethane prepolymer with moisture in the air, curing and cross-linking to form a stable chemical structure. Compared to the first colloid, PUR adhesive has a lower modulus, typically less than or equal to 200 MPa. Therefore, the second colloid has better abrasive properties than the first colloid, and wiping it with a lint-free cloth can create a uniform, smooth, and fine surface.

[0050] In some embodiments, the first and second adhesives are connected by the second adhesive covering the first adhesive, with the second adhesive surrounding the middle frame. That is, the second adhesive covers the side of the first adhesive furthest from the display area. It should be noted that the second adhesive may cover a portion of the first adhesive or completely cover it. The second adhesive has a smoother surface than the first adhesive; a smooth outer surface can be obtained by polishing the second adhesive. The adhesive strength of the second adhesive is less than that of the first adhesive; the first adhesive can increase the stability of the connection between the cover plate and the middle frame.

[0051] In some other embodiments, the first colloid and the second colloid are connected in such a way that each end of the first colloid is connected to two adjacent second colloids, and the first colloid and the second colloid are connected sequentially. By partially setting the first colloid and the second colloid, it can be ensured that no additional space is occupied in the display device used to assemble the display screen, thereby preventing a reduction in the screen-to-body ratio of the display device.

[0052] It should be noted that after the second adhesive forms a second colloid at the second connection point, the second colloid needs to be polished. Polishing the second colloid gives the display device a smooth and delicate outer surface. The solution used to wipe the second colloid can be any organic compound, such as ethanol or a solution containing ethanol. By placing the second colloid between the display screen and the mid-frame, polishing the second colloid results in a smooth and delicate outer surface for the display device, and the wiping method is simple and easy to operate.

[0053] Apply the first and second adhesives to the middle frame. Assemble and press the cover plate to the middle frame. Then, use a glue-wiping roller with a roll of lint-free cloth to smooth out the ring of first or second adhesive that was evenly squeezed out around the cover plate and middle frame during pressing. After the first or second adhesive has cured and shrunk, it will form a uniform and smooth adhesive surface. It should be noted that the adhesive used to smooth it out can be either the first or second adhesive, as long as it is easy to wipe and leaves a smooth surface after wiping.

[0054] It should also be noted that after the cover plate is placed on the middle frame, before the first adhesive applied to the first connecting part of the middle frame has solidified and formed the first colloid, the step of applying the second adhesive to the second connecting part needs to be completed.

[0055] The surface drying time of adhesive is generally between 2 and 4 minutes. Therefore, the time between applying the first adhesive and the second adhesive should be controlled within 2 to 4 minutes. If the surface drying time of the first adhesive is exceeded, the bonding strength of the first adhesive will weaken, resulting in a weak bond between the cover plate and the middle frame, which may cause the display module to lift and fall off.

[0056] Based on this, this application embodiment also provides an assembly tool for a display device, which includes a first valve body and a second valve body, and the assembly tool can realize a dual-valve adhesive spraying process. Specifically, the first valve body is filled with a first adhesive for applying to the first connecting portion of the middle frame, and the second valve body is filled with a second adhesive for applying to the first connecting portion of the middle frame.

[0057] It should be noted that the first valve body and the second valve body can both be filled with the first glue or both with the second glue, depending on the actual application requirements.

[0058] It should be noted that the first valve body can be either a piezoelectric valve or a screw valve, and the second valve body can also be either a piezoelectric valve or a screw valve. The screw valve uses a screw to drive the adhesive application, while the piezoelectric valve uses piezoelectric ceramics and air pressure to drive the adhesive application.

[0059] Specifically, for example, this assembly tool integrates a first valve body capable of dispensing both two-component AB adhesive and a second valve body capable of dispensing single-component PUR adhesive. This method avoids the problem of the first adhesive exceeding its surface drying time during the process of being dispensed from one device to another, which could lead to weak bonding, screen display module lifting, and detachment.

[0060] Please continue reading. Figures 2 to 3 , Figure 2 This is a schematic diagram showing the state of the adhesive in this application. Figure 3 for Figure 2 A schematic diagram showing the interaction between the adhesive, cover plate, and middle frame. The height of the applied adhesive is D1. After the cover plate 2 is placed on the middle frame 1, the width of the adhesive is W, where W is greater than or equal to 0.524 mm and less than or equal to 0.577 mm. The theoretical adhesive overflow calculation is as follows:

[0061] 1. The colloid line width is W1, which is 0.38 mm; the colloid height is D1, which is 0.21 mm; and the height limit platform height is H, which is 0.12 mm. The height limit platform is a boss used to ensure the thickness of the colloid.

[0062] 2. The width W of the glue body formed after the glue is pressed open (calculated according to πr2 / 2=W*H), W=π(R1)2 / 2H, W=0.47 mm.

[0063] W is smaller than the actual average glue width of 0.51 mm.

[0064] The actual glue line applied is not an ideal semicircle, and the height of the glue line is higher than 0.19 mm, generally between 0.21 mm and 0.22 mm, i.e., D1 is 0.21 mm and D2 is 0.22 mm. It should be noted that D1 and D2 are the radii R1 of the ideal semicircle of the second glue.

[0065] If R1 = 0.20 mm, W = 0.524 mm.

[0066] If R1 = 0.21 mm, W = 0.577 mm.

[0067] Based on this, this embodiment, by partially setting a first adhesive and a second adhesive in the middle frame, with the second adhesive replacing the plastic parts in related technologies, significantly reduces the overall visual black border width while maintaining the same overall width. Furthermore, due to blind spots, the second adhesive between the middle frame and the cover plate is not visible from the direction of the display screen, resulting in a better integrated effect. Additionally, the higher strength of either the first or second adhesive increases the stability of the fixed connection between the cover plate and the middle frame.

[0068] Please see Figures 4 to 5 , Figure 4 This is a schematic diagram of the structure of the display device provided in the embodiments of this application. Figure 5 This is a perspective view of a display device provided in an embodiment of this application. This embodiment provides a display device 10, including a middle frame 1, an adhesive 3, a cover plate 2, and a display screen 5. The cover plate is disposed on the display screen 5. The middle frame 1 is fixedly connected to the cover plate 2 via the adhesive 3. The middle frame 1 has a bottom wall and side walls, with the side walls surrounding the bottom wall. The adhesive 3 is disposed at the free end of the side walls. A portion of the inner surface of the cover plate 2 and its periphery are fixedly connected to the adhesive 3. The adhesive 3 includes a first adhesive 31 and a second adhesive 32. The middle frame 1 is connected to the cover plate via the first adhesive 31 and the second adhesive 32 to ensure the integrity of the transition between the cover plate 2 and the middle frame 1, improving the integrated effect of the display device.

[0069] Please see Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of the mid-frame of the display device provided in the embodiments of this application. Figure 7 for Figure 6The enlarged view of part B is shown. The middle frame 1 includes side frames and corner portions 15. A corner portion 15 connects two adjacent side frames. Each side frame has a long frame 14 and a short frame 16, with two adjacent long frames 14 connected by a short frame 16. In the free end of the middle frame 1, the side closer to the display screen 5 is the inner side of the free end, and the side farther from the display screen 5 is the outer side of the free end. The cover plate 2 is bonded to the free end using a first adhesive 31 and a second adhesive 32. The edge of the cover plate 2 is almost flush with the edge of the outer side of the free end, or the edge of the outer side of the free end may be slightly wider than the edge of the cover plate 2.

[0070] A height-limiting protrusion 12 is provided on the inner side of the free end of the middle frame 1. The height-limiting protrusion 12 extends from the inner side of the free end in a direction away from the bottom wall, and the end of the height-limiting protrusion 12 abuts against the cover plate 2. After the first adhesive 31 and the second adhesive 32 are placed on the free end of the middle frame 1, the cover plate 2 is placed on the middle frame 1. At this time, the edge of the cover plate 2 will squeeze the first adhesive 31 and the second adhesive 32 on the free end of the middle frame 1. If the height-limiting protrusion 12 is not provided, the adhesive in some areas may be pressed too thin, which may lead to poor adhesion. Therefore, the height-limiting protrusion 12 is provided on the inner side of the free end of the middle frame 1. The height-limiting protrusion 12 can be provided in a circle on the inner side of the free end, or it can be provided at intervals on the inner side of the free end. The height-limiting protrusion 12 can ensure the thickness of the first adhesive 31 and the second adhesive 32, so that the amount of adhesive in each position is relatively uniform, and there will be no local depressions or protrusions, which further improves the stability of the structure.

[0071] It is understandable that there are multiple bosses 12, spaced apart. Spaced-apart bosses 12 occupy less space than continuously arranged bosses 12, while achieving the same effect.

[0072] The middle frame 1 also includes a first connecting portion and a second connecting portion that are interconnected, with the width of the first connecting portion being greater than the width of the second connecting portion. A first adhesive 31 is disposed on the first connecting portion; a second adhesive 32 is disposed on the second connecting portion. The first adhesive 31 and the second adhesive 32 are connected.

[0073] It should be noted that the first colloid 31 can be any shape, such as a circle, triangle, or ellipse, and the second colloid 32 can also be any shape, such as a circle, triangle, or ellipse.

[0074] It should be noted that the first adhesive 31 can be disposed on one or more corners 15 of the middle frame 1, or on the long side 14 or the short side 16 of the middle frame 1. The second adhesive 32 is disposed around the side side, or it can cooperate with the first adhesive 31 to cover the first adhesive 31 and is disposed on the corners 15 of the middle frame 1.

[0075] Specifically, in combination Figures 8 to 10 , Figure 8 This is a first structural schematic diagram of the first colloid and the second colloid in the display device provided in the embodiments of this application. Figure 9 This is a schematic diagram of the second structure of the first colloid and the second colloid in the display device provided in the embodiments of this application. Figure 10 This is a third structural schematic diagram of the first and second colloids of the display device provided in an embodiment of this application. In some embodiments, the first colloid 31 is disposed on one or more corner portions 15 of the middle frame 1, and the second colloid 32 is disposed on the side frame of the middle frame 1. In some embodiments, the first colloid 31 is disposed on one or more corner portions 15 of the middle frame 1, a portion of the second colloid 32 is disposed on the side frame of the middle frame 1, and another portion of the second colloid 32 is disposed on one or more corner portions 15 of the middle frame 1, covering a portion of the first colloid 31. In other embodiments, the first colloid 31 is disposed on one or more corner portions 15 of the middle frame 1 and on one or more long borders 14 of the side frame.

[0076] The width of the first adhesive 31 is larger than the width of the second adhesive 32. The first adhesive 31 and the second adhesive 32 are connected to each other and are used to bond the free ends of the cover plate 2 and the middle frame 1. The specific distribution positions of the first adhesive 31 and the second adhesive 32 are determined according to the actual situation.

[0077] The first colloid 31 has a stronger adhesive strength than the second colloid 32, while the second colloid 32 has a smoother finish than the first colloid 31. Specifically, the first colloid 31 has a higher adhesive strength, used to firmly bond the cover plate 2 and the middle frame 1 together, and has advantages such as low deformation, high adhesive strength, and good chemical resistance. The second colloid 32 can be used as a sealant between the cover plate 2 and the middle frame 1. The second colloid 32 has advantages such as easy sanding, easy removal of adhesive, easy wiping, and easy repair. After the second colloid 32 fills the gap between the cover plate 2 and the middle frame 1, sanding the second colloid 32 can create a smooth transition between the edge of the cover plate 2 and the edge of the middle frame 1, ensuring the aesthetic appearance of the display device.

[0078] Please see Figure 11 , Figure 11 This is a schematic diagram of the structure of a cover plate in a display device provided in an embodiment of this application. The cover plate includes a viewing window portion 22 and a connecting portion 24, with the connecting portion 24 located at the periphery of the viewing window portion 22. The thickness of the cover plate 2 can be between 0.3 mm and 0.8 mm, and the material of the cover plate 2 can be glass, transparent ceramic, sapphire, high-strength plastic cover plate 2, or other materials whose transmittance and other optical properties meet display standards. The use of the cover plate 2 material in this embodiment is merely illustrative and does not constitute a limitation on the material of the cover plate 2 in this embodiment.

[0079] It should be noted that the display device 10 disclosed in the embodiments of this application may be, but is not limited to, mobile phones, laptops, electronic watches, tablets, walkie-talkies, etc.

[0080] The display device, assembly method, and assembly tool 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 method for assembling a display device, characterized in that, include: A middle frame and a cover plate are provided. The middle frame includes a plurality of first connecting parts and a plurality of second connecting parts, one first connecting part connecting two second connecting parts. The middle frame includes side frames and corner parts, and a corner part is connected between two adjacent side frames. The first connecting parts are located at one or more corner parts of the middle frame, and the second connecting parts are located at one or more side frames of the middle frame. Apply the first adhesive to each of the first connecting parts; Apply a second adhesive to each of the second joints; The cover plate is placed on the middle frame and bonded to the first adhesive and the second adhesive. The first adhesive solidifies at the first connecting part to form a first colloid, and the second adhesive solidifies at the second connecting part to form a second colloid. The first colloid and the second colloid are connected, and the adhesive strength of one of the first colloid and the second colloid is greater than that of the other. The first colloid is disposed on one or more corners of the middle frame, and the second colloid is disposed around the middle frame and covers the first colloid. The smoothness of the second colloid is greater than that of the first colloid, the adhesive strength of the second colloid is less than that of the first colloid, and the width of the second colloid is less than that of the first colloid. The outer surface of the second colloid connecting the middle frame and the cover plate is a smooth arc surface. The middle frame has a height limiting boss on the inner side of its free end. The height limiting boss protrudes and extends from the inner side of the free end in a direction away from the bottom wall. When the cover plate is placed on the middle frame, the height limiting boss abuts against the cover plate at the end away from the bottom wall. The height limiting boss is used to ensure that the thickness of the first colloid and the second colloid is uniform.

2. The assembly method of the display device according to claim 1, characterized in that, The assembly method of the display device further includes: The second colloid is polished so that the smoothness of the polished second colloid is greater than that of the first colloid.

3. The assembly method of the display device according to claim 1, characterized in that, The step of applying the second adhesive to each of the second joints is performed before the first adhesive forms the first colloid.

4. A display device, characterized in that, include: The middle frame includes a first connecting part and a second connecting part that are connected to each other. The width of the first connecting part is greater than the width of the second connecting part. The middle frame includes side borders and corner parts. A corner part is connected between two adjacent side borders. The first connecting part is located at one or more corner parts of the middle frame, and the second connecting part is located at one or more side borders of the middle frame. A first colloid, wherein the first colloid is disposed on the first connecting portion; The second colloid is disposed on the second connecting part, and the adhesive strength of the first colloid is greater than the adhesive strength of the second colloid. A cover plate is placed on the middle frame. The cover plate is fixedly connected to the middle frame by a second adhesive and a first adhesive. The first adhesive is disposed on one or more corners of the middle frame. The second adhesive is disposed around the middle frame and covers the first adhesive. The smoothness of the second adhesive is greater than that of the first adhesive. The adhesive strength of the second adhesive is less than that of the first adhesive. The width of the second adhesive is less than that of the first adhesive. The outer surface of the second adhesive connecting the middle frame and the cover plate is a smooth arc surface. The middle frame has a height limiting boss on the inner side of its free end. The height limiting boss protrudes and extends from the inner side of the free end in a direction away from the bottom wall. When the cover plate is placed on the middle frame, the height limiting boss abuts against the cover plate at the end away from the bottom wall. The height limiting boss is used to ensure that the thickness of the first colloid and the second colloid is uniform.

5. The display device according to claim 4, characterized in that, The outer surface of the second colloid, the edge of the middle frame, and the edge of the cover plate are flush.

6. The display device according to claim 5, characterized in that, There is a gap between the cover plate and the middle frame; the second adhesive is disposed around the outer periphery of the first adhesive, and the second adhesive is arranged around the periphery of the middle frame; or The first colloid and the second colloid are connected, with one first colloid located between two second colloids; The first colloid and the second colloid cover the gap between the cover plate and the middle frame.

7. The display device according to claim 4, characterized in that, The side frame has multiple long frames and multiple short frames, with a short frame spaced apart between two adjacent long frames, and the second connecting part is located on the long frame of the middle frame.

8. The display device according to claim 7, characterized in that, The second connecting portion is disposed on each of the side edges of the middle frame, and the first connecting portion is disposed on each of the corners.

9. The display device according to claim 7, characterized in that, The first connecting portion is disposed at each of the corner portions and the middle portion of each of the side frames, and the second connecting portion is disposed at each of the side frames.

10. An assembly tool for a display device, characterized in that, The display device is as described in any one of claims 4-9, wherein the assembly tool comprises: A first valve body, the first valve body being filled with a first adhesive for applying a first connecting portion to the middle frame; and The second valve body is filled with a second adhesive for applying to the second connection portion of the middle frame.

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