Injection mold, display module, display device and preparation method of display device

Abstract

The invention provides an injection mold, a display module, a display device and a preparation method of the display device.The injection mold is used for forming a rubber frame on the display module and comprises a first mold body and a second mold body, and the first mold body comprises a first mold core and a first mold frame arranged on the outer side of the first mold core; the second mold comprises a second mold core and a second mold frame arranged on the outer side of the second mold core. The first mold core is provided with a first surface and a second surface which are opposite in the first direction, the first surface is used for making contact with the display module, the first mold core comprises injection molding channels and cavities which are formed by recessing the first surface, and the injection molding channels and the cavities are arranged at intervals. Wherein the cavity is used for injection molding to form a box dam structure, the first mold core comprises a fixing structure used for making contact with the box dam structure, and the injection mold drives the box dam structure to be away from the display module together through the fixing structure.

Description

Technical Field

[0001] This application relates to the technical field of display devices, and particularly to an injection mold, a display module, a display device, and a preparation method thereof. Background Art

[0002] With the development of the level of science and technology, the display panel field has also made great progress, and people's demand for narrow borders is increasing day by day. Among them, the insert molding technology adhesively connects the middle frame and the rubber frame to narrow the border of the display device, and can also be used to enhance the structural strength of the display module in the display device. However, how to reduce the influence of the insert molding technology on the structure of the finally formed display device is still a technical problem to be solved currently. Summary of the Invention

[0003] Embodiments of this application provide an injection mold, a display module, a display device, and a preparation method thereof, which can release the space of the whole machine.

[0004] In a first aspect, an embodiment of this application provides an injection mold for forming a rubber frame on a display module. The injection mold includes a first mold and a second mold. The first mold includes a first core and a first mold base disposed outside the first core. The second mold includes a second core and a second mold base disposed outside the second core.

[0005] The first core has a first surface and a second surface opposite to each other in a first direction. The first surface is used to contact the display module. The first core includes an injection channel and a cavity recessed from the first surface. The injection channel and the cavity are spaced apart. The cavity is used for injection molding to form a dam structure, and the first core includes a fixing structure for contacting and arranging with the dam structure. The injection mold drives the dam structure to move away from the display module together through the fixing structure.

[0006] In a second aspect, an embodiment of this application provides a display module. The display module is attached to the rubber frame through the injection mold in any of the foregoing embodiments. The display module includes a display part, a cover plate, a composite functional layer, and an anti-adhesion layer. The cover plate is disposed on one side of the display part. The composite functional layer is disposed on the side of the display part away from the cover plate. The anti-adhesion layer is disposed on the side of the composite functional layer away from the display part. The adhesiveness of the anti-adhesion layer is less than the adhesiveness of at least some film layers in the composite functional layer.

[0007] In a third aspect, an embodiment of the present application provides a display module, which includes a display unit, a cover plate, a bonding part, a protective layer, and an adhesive layer. The cover plate is disposed on one side of the display unit, the bonding part is disposed on the side of the display unit away from the cover plate, the protective layer is disposed on the side of the bonding part away from the display unit, and the bonding part extends beyond the protective layer in a third direction to form a stepped structure, and the thickness direction of the display unit intersects with the third direction. The adhesive layer is partially disposed between the bonding part and the protective layer, and a partial structure in the adhesive layer is disposed in a fitting manner with the stepped structure.

[0008] In a fourth aspect, an embodiment of the present application provides a display device, which is formed by the injection mold in any of the foregoing embodiments. The display device includes a display module and a rubber frame, and the rubber frame is disposed on the periphery of the display module. Among them, the display device does not include a dam structure.

[0009] In a fifth aspect, an embodiment of the present application provides a method for manufacturing a display device, including:

[0010] Fitting a first mold core with the display module. The first mold core is the first mold core in the injection mold in any of the foregoing embodiments, and the cavity penetrates through the first mold core along a first direction;

[0011] Forming a dam structure in the cavity;

[0012] Forming a rubber frame in the injection channel;

[0013] Separating the first mold core and the dam structure from the display module together.

[0014] An embodiment of the present application provides an injection mold, a display module, a display device, and a method for manufacturing the same. By adjusting the structure of the first mold core in the injection mold, the dam structure can be formed by injection molding with the first mold core, thereby improving the structural matching degree between the dam structure and the first mold core, enhancing the sealing effect of the dam structure on the air leakage channel, and improving the structural reliability of the rubber frame. On this basis, the first mold core is further provided with a fixing structure. After the injection molding is completed, the injection mold drives the dam structure away from the display module together through the fixing structure, so that there is no dam structure in the finally formed display device, reducing the influence of the dam structure on the internal layout of the display device. Thus, while improving the reliability of the rubber frame, the internal structure of the display device is simplified, and the space of the whole machine is released. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0016] Figure 1It is a schematic diagram of the assembly structure of a display module and an injection mold provided by an embodiment of the present application;

[0017] Figure 2 It is a schematic diagram of the assembly structure of a display module and a first mold core provided by an embodiment of the present application;

[0018] Figure 3 It is another schematic diagram of the assembly structure of a display module and a first mold core provided by an embodiment of the present application;

[0019] Figure 4 It is another schematic diagram of the assembly structure of a display module and a first mold core provided by an embodiment of the present application;

[0020] Figure 5 It is another schematic diagram of the assembly structure of a display module and a first mold core provided by an embodiment of the present application;

[0021] Figure 6 It is another schematic diagram of the assembly structure of a display module and a first mold core provided by an embodiment of the present application;

[0022] Figure 7 It is Figure 6 The enlarged structure schematic diagram at area Q in

[0023] Figure 8 It is another schematic diagram of the structure of a display module provided by an embodiment of the present application;

[0024] Figure 9 It is another schematic diagram of the partial assembly structure of a display module and a first mold core provided by an embodiment of the present application;

[0025] Figure 10 It is another schematic diagram of the structure of a display module provided by an embodiment of the present application;

[0026] Figure 11 It is another schematic diagram of the structure of a display module provided by an embodiment of the present application;

[0027] Figure 12 It is a schematic diagram of the structure of a display device provided by an embodiment of the present application;

[0028] Figure 13 It is a flowchart of a preparation method of a display device provided by an embodiment of the present application;

[0029] Figures 14a to 14d It is a process structure schematic diagram of a preparation method of a display device provided by an embodiment of the present application.

[0030] Marking description:

[0031] 100, injection mold; 200, display module; 300, display device;

[0032] J1, the first mold; J11, the first mold base; J2, the second mold; J21, the second mold base; J22, the second mold core;

[0033] 10, the first mold core; 11, the first surface; 111, the first sub - surface; 112, the second sub - surface; 12, the second surface; 13, the cavity; 131, the first sub - cavity; 132, the second sub - cavity; 133, the side wall; 134, the first opening; 135, the second opening; 14, the injection channel; 15, the fixing structure; 151, the protruding structure; 152, the supporting surface; 153, the adhesive layer; 16, the glue inlet channel;

[0034] 20, the dam structure; 21, the first sub - part; 22, the second sub - part;

[0035] 31, the display part; 32, the cover plate; 33, the composite functional layer; 331, the bonding part; 332, the protective layer; 333, the supporting layer; 34, the anti - adhesion layer; 35, the bending part; 36, the adhesive layer; 361, the overflow part;

[0036] 40, the rubber frame;

[0037] T, the step structure;

[0038] X1, the first direction; Y1, the second direction; X2, the thickness direction; Y2, the third direction; Z, the fourth direction. Detailed implementation manners

[0039] The features and exemplary embodiments of various aspects of the present application will be described in detail below. To make the purpose, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below in combination with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0040] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0041] The display module 200 is used to prepare and form a display device 300 and includes a display area, a bonding area, and a bending area located between the two. During the preparation process of the display device 300, it is usually necessary to perform a bending process on the bending area. During this process, due to factors such as the thickness of the film layer itself, some film layer structures in the display area will shrink relative to other film layers, thereby forming a step structure T at the boundary position.

[0042] During the assembly process of the injection mold 100 and the display module 200, due to the existence of the step structure T, it is easy to have problems with poor assembly between the injection mold 100 and the display module 200, thereby posing a risk of air leakage at the boundary position. Further, during the injection molding process, due to the existence of the air leakage phenomenon, it is easy to cause poor molding of the rubber frame 40, affecting the yield rate and reliability of the finally formed display device 300.

[0043] In order to improve the air leakage problem, a dam can be selected to be added at the boundary position of the display module 200, and the dam is used to block the air leakage channel. However, the dam has no functionality after the injection molding is completed, and the existence of the dam will occupy the overall space of the display device 300, which is not conducive to the internal structure layout of the display device 300.

[0044] In view of the above problems, on the first aspect, please refer to Figure 1 , an embodiment of the present application provides an injection mold 100. The injection mold 100 is used to form a rubber frame 40 on the display module 200. The injection mold 100 includes a first mold J1 and a second mold J2. The first mold J1 includes a first mold core 10 and a first mold frame J11 disposed outside the first mold core 10. The second mold J2 includes a second mold core J22 and a second mold frame J21 disposed outside the second mold core J22.

[0045] The first mold core 10 has opposite first surface 11 and second surface 12 in the first direction X1. The first surface 11 is used to contact the display module 200. The first mold core 10 includes an injection channel 14 and a cavity 13 formed by recessing from the first surface 11. The injection channel 14 and the cavity 13 are arranged at intervals. Among them, the cavity 13 is used for injection molding to form the dam structure 20, and the first mold core 10 includes a fixing structure 15 for contacting and setting with the dam structure 20. The injection mold 100 drives the dam structure 20 away from the display module 200 together through the fixing structure 15.

[0046] The injection mold 100 is a processing tool for forming the rubber frame 40. Specifically, the injection mold 100 injects plastic around the side of the display module 200, so as to form the rubber frame 40 on the outer peripheral side of the display module 200. The rubber frame 40 is used to connect with the middle frame located on its outer peripheral side to meet the relative fixation between the display module 200 and the middle frame, and is used to support and protect the internal structure of the display module 200.

[0047] The injection mold 100 includes a first mold J1 and a second mold J2. During the injection molding process, first assemble the first mold J1 and the second mold J2 relative to the display module 200, and then pour glue into the injection channel 14 to form the rubber frame 40 fixed to the display module 200. Then move the first mold J1 and the second mold J2 away from the display module 200 to realize the separation of the display module 200 and the injection mold 100.

[0048] The first mold J1 includes a first mold core 10 and a first mold base J11, and the second mold J2 includes a second mold core J22 and a second mold base J21. The first mold core 10 and the second mold core J22 are the core components of the first mold J1 and the second mold J2 respectively. The two are arranged on both sides in the thickness direction X2 of the display module 200 and are both in contact with the display module 200. The first mold base J11 and the second mold base J21 are the basic structures of the first mold J1 and the second mold J2 respectively, and play the role of supporting and fixing the corresponding mold cores.

[0049] In some alternative embodiments, the first mold core 10 and the second mold core J22 include flexible materials, and the first mold base J11 and the second mold base J21 include rigid materials. Further optionally, the first mold core 10 and the second mold core J22 include silicone materials, the first mold base J11 and the second mold base J21 include metal materials, and the first mold core 10 and the second mold core J22 are made by encapsulating glue on the first mold base J11 and the second mold base J21 respectively.

[0050] The first mold core 10 has opposite first and second surfaces 11 and 12 in the first direction X1. After the first mold core 10 is assembled with the display module 200, the first direction X1 can be parallel to the thickness direction X2 of the display module 200, and the first surface 11 can be in direct contact with the display module 200. The injection channel 14 is formed by indenting inward from the first surface 11, and the size and shape of the injection channel 14 determine the size and shape of the glue frame 40. Among them, the size and shape of the injection channel 14 are usually related to the size and shape of the display module 200, and the embodiments of the present application do not limit this. Optionally, the display module 200 can be circular or rectangular. Correspondingly, the injection channel 14 can be an annular injection channel 14 surrounding the circular display module 200, or a rectangular frame injection cavity channel surrounding the rectangular display module 200.

[0051] To meet the need for glue injection, the first mold core 10 is further provided with a glue inlet channel and a glue outlet channel. Both the glue inlet channel and the glue outlet channel are located on the side of the injection channel 14 facing the second surface 12. Both are connected to the injection channel 14 and are spaced apart from each other. Correspondingly, the first mold base J11 is further provided with a glue inlet connected to the glue inlet channel and a glue outlet connected to the glue outlet channel. The specific positions of the glue inlet channel and the glue outlet channel are not limited in the embodiments of the present application. Among them, Figure 1 shows the case where the glue inlet channel 16 is located on one side of the step structure T of the display module 200, while Figure 2 shows the case where neither the glue inlet channel nor the glue outlet channel is located on one side of the step structure T.

[0052] In addition to the injection channel 14, the first mold core 10 is further provided with a cavity 13. The cavity 13 is a cavity structure in the first mold core 10 for injection molding the dam structure 20. Among them, the dam structure 20 is a blocking structure, which is arranged at the step structure T to block the air leakage space during the injection molding process, thereby improving the structural reliability of the glue frame 40. The same as the injection channel 14, the cavity 13 is also formed by indenting inward from the first surface 11. The injection channel 14 and the cavity 13 are spaced apart, and during the injection molding process, the injection channel 14 and the cavity 13 are isolated from each other, that is, the glue poured into the injection channel 14 will not enter the cavity 13.

[0053] In the related art, the dam and the injection mold 100 are usually two independent structures. Usually, a dam is first set on the display module 200, and then the display module 200 with the dam is assembled with the injection mold 100. However, in the embodiments of the present application, the injection mold 100 is used not only to form the glue frame 40 but also to form the dam structure 20. Specifically, the cavity 13 of the first mold core 10 in the injection mold 100 is used to inject and form the dam structure 20, that is, the formation of the dam structure 20 depends on the injection mold 100. During the injection molding process, it is necessary to first form the dam structure 20 in the cavity 13 by injection, and then perform the glue filling process. The injection molding methods of the two are not the same.

[0054] According to different actual needs, the dam structure 20 can be first formed in the injection mold 100, and then the injection mold 100 and the dam structure 20 are assembled together on the display module 200, or the injection mold 100 and the display module 200 can be first assembled, and then the dam structure 20 is formed by injection. The embodiments of the present application do not make any restrictions. And the size and shape of the dam structure 20 depend on the size and shape of the cavity 13. The specific shape and size of the cavity 13 are not restricted in the embodiments of the present application. The cavity 13 can be completely penetrated through the first mold core 10, or the cavity 13 can also not penetrate through the first mold core 10.

[0055] Furthermore, the first mold core 10 further includes a fixing structure 15. The fixing structure 15 can be in contact with the injection-formed dam structure 20. And during the process of the injection mold 100 separating from the display module 200, the dam structure 20 can move away from the display module 200 together under the drive of the fixing structure 15, realizing the relative separation from the display module 200, so that there is no dam structure 20 in the finally formed display device 300, reducing the influence of the dam structure 20 on the internal structure layout of the display device 300.

[0056] It should be noted that the fixing structure 15 can have various forms. For example, the fixing structure 15 includes a wall surface structure for enclosing to form the cavity 13, that is, by adjusting the shape of the cavity 13, the surrounding wall surface structure can drive the dam structure 20 to move away from the display module 200 together, or the fixing structure 15 can also include other structures located in the cavity 13. The embodiments of the present application do not make any restrictions on this, as long as the fixing structure 15 is located on the first mold core 10 and can drive the dam structure 20 to move together.

[0057] In some alternative embodiments, such as Figure 1As shown, the cavity 13 does not penetrate through the first mold core 10 in the first direction X1, and the fixing structure 15 includes an adhesive layer 153 provided on the bottom wall of the cavity 13. The dam structure 20 formed in the cavity 13 can be relatively fixed to the first mold core 10 through the adhesive layer 153. After the injection molding is completed, the dam structure 20 can drive the dam structure 20 away from the display module 200 together through the adhesive layer 153.

[0058] In summary, in the embodiment of the present application, the structure of the first mold core 10 in the injection mold 100 is adjusted, so that the dam structure 20 can be formed by injection molding of the first mold core 10, thereby improving the structural matching degree between the dam structure 20 and the first mold core 10, enhancing the sealing effect of the dam structure 20 on the air leakage channel, and improving the structural reliability of the rubber frame 40. On this basis, the first mold core 10 is further provided with a fixing structure 15. After the injection molding is completed, the injection mold 100 drives the dam structure 20 away from the display module 200 together through the fixing structure 15, so that there is no dam structure 20 in the finally formed display device 300, reducing the influence of the dam structure 20 on the internal layout of the display device 300. Thus, while improving the reliability of the rubber frame 40, the internal structure of the display device 300 is simplified, and the space of the whole machine is released.

[0059] In some embodiments, as Figure 2 shown, the cavity 13 penetrates through the first mold core 10 along the first direction X1.

[0060] Combined with the foregoing content, it can be seen that different from the related art, the first mold core 10 and the dam structure 20 in the embodiment of the present application are not two independent structures, and the dam structure 20 needs to be formed by injection molding of the first mold core 10. On this basis, in order to improve the preparation accuracy of the dam structure 20 and enhance the cooperation effect between the dam structure 20 and the step structure T, the cavity 13 is also set to penetrate through the first mold core 10 in the embodiment of the present application.

[0061] Specifically, since the cavity 13 penetrates through the first mold core 10 along the first direction X1, during the injection molding process, the first mold core 10 and the display module 200 can be assembled first, and then injection is carried out into the cavity 13 from the side of the second surface 12 to form the dam structure 20. In this design, the size and shape of the dam structure 20 not only depend on the size and shape of the cavity 13, but also depend on the size and shape of the display module 200, so that the surface of the dam structure 20 facing the display module 200 can better match and fit with the step structure T, thereby further reducing the risk of air leakage at the step structure T and improving the preparation reliability of the rubber frame 40.

[0062] In some embodiments, as Figure 2As shown, the fixing structure 15 includes the side wall 133 of the cavity 13. The cavity 13 includes a first sub-cavity 131 and a second sub-cavity 132 that are communicatively arranged in the first direction X1. The second sub-cavity 132 is located on the side of the first sub-cavity 131 facing the second surface 12. Among them, the maximum dimension of the second sub-cavity 132 in the second direction Y1 is greater than the maximum dimension of the first sub-cavity 131 in the second direction Y1, and the second direction Y1 is perpendicular to the first surface 11.

[0063] The first sub-cavity 131 and the second sub-cavity 132 are different components of the cavity 13 respectively, and both are used to define and form the dam structure 20. On this basis, the dam structure 20 includes a first sub-part 21 located in the first sub-cavity 131 and a second sub-part 22 located in the second sub-cavity 132. Among them, the second sub-cavity 132 is located on the side of the first sub-cavity 131 facing the second surface 12. Therefore, the first sub-part 21 is closer to the display module 200 than the second sub-part 22. Optionally, the first sub-part 21 is in contact with the step structure T.

[0064] Furthermore, since the maximum dimension of the second sub-cavity 132 in the second direction Y1 is greater than the maximum dimension of the first sub-cavity 131 in the second direction Y1, the maximum dimension of the second sub-part 22 in the second direction Y1 is greater than the maximum dimension of the first sub-part 21 in the second direction Y1. Among them, the second direction Y1 mentioned here refers to any direction perpendicular to the first direction X1. In other words, as long as the maximum dimension of the second sub-cavity 132 can be greater than the maximum dimension of the first sub-cavity 131 in any direction perpendicular to the first direction X1.

[0065] In this design, when the first mold core 10 is away from the display module 200, due to the difference in the maximum dimensions of the first sub-cavity 131 and the second sub-cavity 132 in the second direction Y1, the second sub-part 22 will be lifted by the side wall 133 of the cavity 13, resulting in the dam structure 20 moving away from the display module 200 together, so that there is no dam structure 20 in the finally formed display device 300, reducing the influence of the dam structure 20 on the internal layout of the display device 300 and releasing the space of the whole machine.

[0066] Regarding the dimensions and shapes of the first sub-cavity 131 and the second sub-cavity 132, the embodiments of the present application do not make any restrictions. At different positions in the first direction X1, the dimensions of the first sub-cavity 131 in the second direction Y1 can remain the same, or there can be differences. The same is true for the second sub-cavity 132. Optionally, as Figure 2As shown, the side wall 133 of the first sub-cavity 131 can be spaced apart from the side wall 133 of the second sub-cavity 132, and the dimensions of different positions of the first sub-cavity 131 in the second direction Y1 are kept consistent, and the dimensions of different positions of the second sub-cavity 132 in the second direction Y1 are kept consistent. On this basis, the side wall 133 of the cavity 13 includes a first wall surface on the peripheral side of the first sub-cavity 131, a second wall surface on the peripheral side of the second sub-cavity 132, and a connecting wall connecting the first wall surface and the second wall surface. In this case, when the first mold core 10 moves away from the display module 200, the connecting wall can lift and drive the dam structure 20 to move away from the display module 200 together.

[0067] In addition, the first sub-cavity 131 and the second sub-cavity 132 can be of the same shape, or can also be of different shapes. For example, the projection of the first sub-cavity 131 in the first direction X1 is circular, while the projection of the second sub-cavity 132 in the first direction X1 is square, or the projections of the first sub-cavity 131 and the second sub-cavity 132 in the first direction X1 can also both be circular. And in addition to including the first sub-cavity 131 and the second sub-cavity 132, the cavity 13 can include other sub-cavity structures, or can also not include other sub-cavity structures, and the embodiments of the present application do not limit this.

[0068] In the embodiments of the present application, by setting the maximum dimensions of the first sub-cavity 131 and the second sub-cavity 132 in the cavity 13 different in the second direction Y1, when the first mold core 10 is separated from the display module 200, the dam structure 20 can be lifted by the side wall 133 of the cavity 13, so as to meet the separation requirement between the dam structure 20 and the display module 200 and release the space of the whole machine.

[0069] In some embodiments, please refer to Figure 3 , in the direction from the first surface 11 to the second surface 12, the dimension of the cavity 13 in the second direction Y1 shows a gradually increasing trend.

[0070] Since in the direction gradually approaching the second surface 12, the dimension of the cavity 13 in the second direction Y1 gradually increases, the maximum dimension of the first sub-cavity 131 in the second direction Y1 is the dimension of the end of the first sub-cavity 131 close to the second sub-cavity 132 in the second direction Y1, and the maximum dimension of the second sub-cavity 132 in the second direction Y1 is the dimension of the end of the second sub-cavity 132 away from the first sub-cavity 131 in the second direction Y1. Further optionally, the side wall 133 of the first sub-cavity 131 and the side wall 133 of the second sub-cavity 132 are continuously arranged with each other, and the two together form an inclined surface structure surrounding the dam structure 20 on the peripheral side.

[0071] In the embodiment of the present application, the dimension of the cavity 13 in the second direction Y1 is set to gradually increase, so that the side wall 133 of the cavity 13 can have a flat and continuous inclined surface structure. In this way, when the first mold core 10 is separated from the display module 200, the side wall 133 of the cavity 13 can lift the dam structure 20 to move away from the display module 200 together. On this basis, the relatively flat side wall 133 structure can improve the fitting effect between it and the dam structure 20, enhance the relative acting force between the two, and reduce the risk of the dam structure 20 moving relative to the first mold core 10.

[0072] Furthermore, since the side wall 133 of the cavity 13 can have a flat and continuous inclined surface structure, during the preparation process of the first mold core 10, the cavity 13 can be formed by a single process, thereby reducing the processing difficulty of the injection mold 100.

[0073] In addition, the embodiment of the present application can make the dimensions of the two openings of the cavity 13 in the first direction X1 different. Specifically, the opening dimension of the cavity 13 facing the display module 200 side is smaller, and this opening dimension often determines the contact area between the dam structure 20 and the display module 200. Therefore, this design can reduce the contact area between the dam structure 20 and the display module 200, making it easier for the dam structure 20 to separate from the display module 200.

[0074] In some embodiments, please refer to Figure 4 , the fixing structure 15 includes a convex structure 151 protruding from the side wall 133 of the cavity 13, and the convex structure 151 is used for contacting the dam structure 20.

[0075] The convex structure 151 is a structure protruding from the side wall 133 of the cavity 13. The convex structure 151 can be made of the same material as the side wall 133 of the cavity 13 and formed together in the same preparation process, or the convex structure 151 can also be made of a different material from the side wall 133 of the cavity 13 and connected to the side wall 133 of the cavity 13 by means of welding or threaded connection.

[0076] In the embodiment of the present application, the fixing structure 15 includes a convex structure 151, and the convex structure 151 can cooperate with the dam structure 20 to contact. Thus, during the process of the first mold core 10 separating from the module, the convex structure 151 can play a role in directly or assisting in driving the dam structure 20 away from the display module 200, meeting the separation requirement between the dam structure 20 and the display module 200, and releasing the space of the whole machine.

[0077] It should be noted that the specific positional relationship between the convex structure 151 and the dam structure 20, as well as the specific contact and connection method between the two, are not limited in the embodiments of the present application. As long as during the process of the first mold core 10 detaching from the module, the convex structure 151 can provide a certain demolding force for the dam structure 20 to assist or directly achieve the relative separation between the dam structure 20 and the display module 200. And only one convex structure 151 can be provided in the cavity 13, or multiple convex structures 151 can be provided simultaneously, which is not limited in the embodiments of the present application.

[0078] In some embodiments, please refer to Figure 4 and Figure 5 , at least part of the convex structure 151 is used for plug-in cooperation with the dam structure 20; or the convex structure 151 includes a support surface 152 facing away from the first surface 11, and the support surface 152 is located in the cavity 13 and is spaced from the second surface 12 in the first direction X1.

[0079] Since the convex structure 151 protrudes from the inner wall of the cavity 13, and the dam structure 20 is defined by the cavity 13, the presence of the convex structure 151 will also affect the morphology of the dam structure 20. On this basis, through the size and shape of the convex structure 151 and its positional relationship relative to the cavity 13, different cooperation relationships can be formed between the convex structure 151 and the dam structure 20.

[0080] Specifically, as Figure 4 shown, if the convex structure 151 is arranged at the central position of the side wall 133 of the cavity 13 in the first direction X1, the corresponding dam structure 20 formed will have a groove structure corresponding to the convex structure 151, and the convex structure 151 can be inserted and fitted with the dam structure 20 through this groove structure. Further, through the plug-in cooperation, the convex structure 151 can provide a certain demolding force for the dam structure 20 to directly or assist in driving the dam structure 20 away from the display module 200 during the process of the first mold core 10 detaching from the display module 200.

[0081] Or as Figure 5 shown, if the convex structure 151 has a certain size in the second direction Y1, and the support surface 152 of the convex structure 151 facing away from the first surface 11 can be spaced from the second surface 12, then the presence of the support surface 152 can provide a certain support force for the dam structure 20, and under the action of this support force, the convex structure 151 can directly or assist in driving the dam structure 20 away from the display module 200.

[0082] In summary, in the embodiments of the present application, whether the convex structure 151 is inserted and cooperated with the dam structure 20 or the convex structure 151 has a supporting surface 152 for supporting the dam structure 20, it can provide a certain acting force for the dam structure 20 to directly or assist in driving the dam structure 20 away from the display module 200, reducing the layout influence of the dam structure 20 on the subsequent formed display device 300, and releasing the space of the whole machine.

[0083] In some alternative embodiments, please refer to Figure 6 , the fixing structure 15 includes the side wall 133 of the cavity 13 and the convex structure 151 protruding and connected to the side wall 133 of the cavity 13. In the direction from the first surface 11 to the second surface 12, the size of the cavity 13 in the second direction Y1 shows a gradually increasing trend. Among them, the convex structure 151 is used for inserting and cooperating with the dam structure 20.

[0084] Under this design, the dam structure 20 can be far away from the display module 200 under the lifting action of the side wall 133 of the cavity 13, and the convex structure 151 can provide a certain demolding acting force for the dam structure 20, playing a role in assisting the dam structure 20 to separate from the display module 200.

[0085] In some embodiments, please refer to Figure 6 and Figure 7 , the cavity 13 has a first opening 134 deviating from the second surface 12 in the first direction X1. The size of the first opening 134 in the second direction Y1 is L, and 0.2 mm ≤ L ≤ 2 mm. The second direction Y1 is perpendicular to the first direction X1. Optionally, L is one of 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, and 2 mm.

[0086] Taking the cavity 13 penetrating the first mold core 10 in the first direction X1 as an example, the cavity 13 has opposite first opening 134 and second opening 135 in the first direction X1. According to the different morphologies of the cavity 13 in different cases, the sizes of the first opening 134 and the first opening 134 in the second direction Y1 may be the same or different. Among them, the first opening 134 is farther from the second surface 12 than the second opening 135, and the size of the first opening 134 is often positively correlated with the contact area of the dam structure 20 relative to the display module 200.

[0087] Therefore, in the embodiment of the present application, the dimension L of the first opening 134 in the second direction Y1 is set to be no greater than 2 mm, so as to limit and reduce the contact area of ​​the dam structure 20 with respect to the display module 200, thereby helping to reduce the difficulty of separating the dam structure 20 from the display module 200 and improve the reliability of the injection molding process. At the same time, the dimension L of the first opening 134 in the second direction Y1 is set to be no less than 0.2 mm, so that the dam structure 20 can cover the step structure T, improve the blocking effect of the dam structure 20 on the air leakage channel, and improve the manufacturing yield rate of the plastic frame 40.

[0088] In some embodiments, Figure 6 and Figure 7 As shown, the first surface 11 includes a first sub-surface 111 located between the mold cavity 13 and the injection channel 14, and a second sub-surface 112 located on the side of the mold cavity 13 away from the injection channel 14. In the first direction X1, the second sub-surface 112 is located on the side of the first sub-surface 111 close to the second surface 12.

[0089] The first sub-surface 111 and the second sub-surface 112 are respectively located on both sides of the first opening 134 in the second direction Y1. Combined with the foregoing content, it can be known that when the first mold core 10 is assembled to the display module 200, the first opening 134 corresponds to the step structure T of the display module 200. Due to the existence of the step structure T, the two areas of the display module 200 that are respectively in contact with the first sub-surface 111 and the second sub-surface 112 will be spaced apart in the thickness direction X2 of the display module 200.

[0090] In view of this, the embodiment of the present application sets the first sub-surface 111 and the second sub-surface 112 to be spaced apart in the first direction X1, so that the two are respectively matched with the areas on both sides of the step structure T in the display module 200, thereby improving the assembly accuracy between the first mold core 10 and the display module 200, thereby helping to improve the matching reliability between the dam structure 20 and the display module 200, and enhancing the sealing effect of the dam structure 20 on the leakage channel, thereby improving the preparation reliability of the rubber frame 40.

[0091] Second, see Figure 8 and Figure 9 The embodiment of the present application provides a display module 200, which is arranged by bonding the injection mold 100 and the plastic frame 40 in any of the aforementioned embodiments. The display module 200 includes a display part 31, a cover plate 32, a composite functional layer 33 and a viscosity-reducing layer 34. The cover plate 32 is arranged on one side of the display part 31, the composite functional layer 33 is arranged on the side of the display part 31 away from the cover plate 32, and the viscosity-reducing layer 34 is arranged on the side of the composite functional layer 33 away from the display part 31. The viscosity of the viscosity-reducing layer 34 is less than the viscosity of at least part of the film layer in the composite functional layer 33.

[0092] The display module 200 is a core component for forming a display device 300. The display unit 31 is the main component in the display module 200 for achieving the display effect. The display unit 31 includes a plurality of film layer structures arranged in a stacked manner. For example, the display unit 31 may include an array substrate, a light-emitting functional layer, and a color filter substrate arranged in a stacked manner. Among them, since the display device 300 can have various types, the light-emitting functional layer can also have various forms. Exemplarily, if the display device 300 is an organic light-emitting display device, the light-emitting functional layer includes a hole injection layer, an electron injection layer, and an organic light-emitting layer located therebetween. If the display device 300 is a liquid crystal display device, the light-emitting functional layer includes a liquid crystal layer.

[0093] The display unit 31 has an opposite light-emitting surface and a backlight surface in the thickness direction X2 of the display module 200. The cover plate 32 is a film layer structure disposed on one side of the light-emitting surface of the display unit 31 and plays a protective role for the display unit 31. The composite functional layer 33 is a film layer structure disposed on one side of the backlight surface of the display unit 31 and plays a specific function. The specific function performed by the composite functional layer 33 is not limited in the embodiments of the present application. Optionally, the composite functional layer 33 can support the display unit 31, or the composite functional layer 33 can also dissipate the heat generated during the operation of the display unit 31.

[0094] The composite functional layer 33 includes a plurality of film layer structures arranged in a stacked manner. During the bending process of the display module 200, due to factors such as the position and thickness of the film layers, the plurality of film layer structures in the composite functional layer 33 will have different deformation amounts, and a step structure T will be formed at the edge position. The existence of the step structure T is likely to generate an air leakage channel during the injection molding process, affecting the preparation yield of the rubber frame 40.

[0095] However, in the embodiments of the present application, the dam structure 20 is formed during the injection molding process, which can block the air leakage channel, thereby improving the preparation reliability of the rubber frame 40. At the same time, after the injection molding is completed, the dam structure 20 can be separated from the display module 200 together with the injection mold 100, so that there is no dam structure 20 in the finally formed display device 300, releasing the space of the whole machine.

[0096] In addition to the above-mentioned film layer structure, the display module 200 in the embodiment of the present application also includes a viscosity-reducing layer 34, which is arranged on the side of the composite functional layer 33 away from the display part 31. Therefore, during the injection molding process, the viscosity-reducing layer 34 can replace the composite functional layer 33 and directly contact the dam structure 20. Further, since the viscosity-reducing layer 34 has a lower viscosity than at least part of the film layer in the composite functional layer 33, compared with the solution in which the dam structure 20 is in direct contact with the composite functional layer 33, this design can make it easier to separate the dam structure 20 from the display module 200, thereby reducing the space occupied by the dam structure 20 in the finally formed display device 300. At the same time, since the thickness of the viscosity-reducing layer 34 itself is often smaller than the size of the dam structure 20 in the first direction X1, this design can reduce the difficulty of separation between the dam structure 20 and the display module 200 while releasing the space of the whole machine, and has strong practicality.

[0097] It should be noted that the embodiment of the present application does not limit the specific positional relationship between the adhesion-reducing layer 34 and the step structure T. The adhesion-reducing layer 34 can cover at least a portion of the step structure T, or the adhesion-reducing layer 34 can also be staggered with the step structure T, as long as the adhesion-reducing layer 34 can be in contact with the dam structure 20 during the injection molding process.

[0098] In some embodiments, Figure 8 and Figure 9 As shown, the edge region of the surface of the composite functional layer 33 away from the display part 31 in the third direction Y2 forms a step structure T, and the thickness direction X2 of the display part 31 intersects the third direction Y2. The adhesion-reducing layer 34 at least partially covers the step structure T.

[0099] The thickness direction X2 of the display portion 31 is in the same direction as the thickness direction X2 of the display module 200. For the convenience of illustration, the embodiment of the present application illustrates the two directions in the same direction. The third direction Y2 is a direction intersecting with the thickness direction X2 of the display portion 31. Optionally, the third direction Y2 is perpendicular to the thickness direction X2 of the display portion 31. Further, when the first mold core 10 is assembled with the display module 200, the first direction X1 is parallel to the thickness direction X2 of the display portion 31, and the second direction Y1 is parallel to the third direction Y2.

[0100] In the embodiment of the present application, the step structure T is formed at the edge area of ​​the composite functional layer 33 in the third direction Y2, and the anti-adhesion layer 34 can at least partially cover the step structure T, thereby further increasing the contact area between the anti-adhesion layer 34 and the dam structure 20, thereby further reducing the difficulty of separation between the dam structure 20 and the display module 200.

[0101] In some embodiments, see Figures 8 to 10, the composite functional layer 33 includes a binding portion 331 and a protective layer 332 disposed on a side of the binding portion 331 facing away from the display portion 31. In the third direction Y2, the binding portion 331 extends beyond the protective layer 332 and forms a stepped structure T. The display module 200 further includes a bending portion 35. The binding portion 331 and the bending portion 35 are bent to a side of the display portion 31 facing away from the cover plate 32. One end of the display portion 31 along the fourth direction Z is connected to the bending portion 35, and the thickness direction X2, the third direction Y2, and the fourth direction Z of the display portion 31 intersect pairwise.

[0102] The binding portion 331 is bent to a side of the display portion 31 facing away from the cover plate 32 through the bending portion 35, so that the display portion 31 and the binding portion 331 are disposed opposite to each other in the thickness direction X2 of the display portion 31. Wherein, the binding portion 331 and the display portion 31 are connected through the bending portion 35, and one end of the binding portion 331 and the display portion 31 in the fourth direction Z are both connected to the bending portion 35. Optionally, the thickness direction X2, the third direction Y2, and the fourth direction Z of the display portion 31 are perpendicularly disposed pairwise.

[0103] The protective layer 332 is disposed on a side of the binding portion 331 facing away from the display portion 31, and the protective layer 332 can protect the binding portion 331. Optionally, the protective layer 332 may include an insulating material, so that the protective layer 332 can not only physically protect the binding portion 331, but also insulate the binding portion 331. During the bending process of the display module 200, due to factors such as the bending degree and thickness, a stepped structure T will be formed at the edge between the protective layer 332 and the binding portion 331 in the third direction Y2. On this basis, in the embodiment of the present application, a dam structure 20 is provided at this position, which helps to improve the preparation yield of the rubber frame 40, and after injection molding, the dam structure 20 can also be separated, thereby reducing the occupation of the internal space of the display device 300 by the dam structure 20.

[0104] Further, the anti-adhesive layer 34 can cover a part of the structure of the binding portion 331 that extends beyond the protective portion in the third direction Y2, so that the anti-adhesive layer 34 at least partially covers the stepped structure T, thereby meeting the contact requirement between the anti-adhesive layer 34 and the dam structure 20 and reducing the separation difficulty between the dam structure 20 and the display module 200.

[0105] In some embodiments, as Figures 8 to 10 shown, the composite functional layer 33 further includes a support layer 333 disposed on a side of the binding portion 331 facing the display portion 31. In the third direction Y2, the support layer 333 extends beyond the binding portion 331. Wherein, the projection of the anti-adhesive layer 34 in the thickness direction X2 of the display portion 31 is located within the projection of the support layer 333 in the thickness direction X2 of the display portion 31.

[0106] The support layer 333 is a film layer structure that supports the bonding portion 331. Optionally, the support layer 333 may include steel. The support layer 333 is located on the side of the bonding portion 331 facing the display portion 31, and in the third direction Y2, the support layer 333 extends beyond the bonding portion 331. On this basis, two-level step structures T are formed at the edge positions of the support layer 333, the bonding portion 331, and the protective layer 332 in the third direction Y2.

[0107] Furthermore, in the embodiment of the present application, the projection of the adhesion reduction layer 34 in the thickness direction X2 of the display portion 31 is set to be within the projection of the support layer 333 in the thickness direction X2 of the display portion 31, that is, the adhesion reduction layer 34 does not extend beyond the support layer 333. This can prevent direct contact between the adhesion reduction layer 34 and the display portion 31, while reducing the separation difficulty between the dam structure 20 and the display module 200, and reducing the adverse effects of the adhesion reduction layer 34 on the display portion 31.

[0108] In some embodiments, the material of the adhesion reduction layer 34 includes at least one of silica and silicone oil.

[0109] In the embodiment of the present application, silicone oil has a low surface tension, which enables it to spread on the solid surface and reduce the surface energy of the material, while silica can reduce the surface energy of the material through modification and other means. On this basis, by setting the material of the adhesion reduction layer 34 to include at least one of silica and silicone oil, the surface energy can be reduced, thereby reducing the adhesion between the dam structure 20 and the display module 200 and reducing the separation difficulty between the two.

[0110] In a third aspect, please refer to Figure 11 , the embodiment of the present application provides a display module 200, which includes a display portion 31, a cover plate 32, a bonding portion 331, a protective layer 332, and an adhesive layer 36. The cover plate 32 is disposed on one side of the display portion 31, the bonding portion 331 is disposed on the side of the display portion 31 facing away from the cover plate 32, the protective layer 332 is disposed on the side of the bonding portion 331 facing away from the display portion 31, and the bonding portion 331 extends beyond the protective layer 332 in the third direction Y2 to form a step structure T. The thickness direction X2 of the display portion 31 intersects with the third direction Y2. The adhesive layer 36 is partially disposed between the bonding portion 331 and the protective layer 332, and a part of the structure in the adhesive layer 36 is disposed in a fitting manner with the step structure T.

[0111] The adhesive layer 36 is a film layer structure for fixing the protective layer 332 and the bonding portion 331. Optionally, the adhesive layer 36 includes an optical adhesive. In the related art, for the adhesive layer structure used to bond the bonding portion 331 and the protective layer 332, its projection in the thickness direction X2 of the display portion 31 generally does not extend beyond the projection of the protective layer 332 in the thickness direction X2 of the display portion 31.

[0112] However, in the embodiments of the present application, the structure of the adhesive layer 36 is adjusted. Part of the structure of the adhesive layer 36 can be arranged in a fitting manner with the stepped structure T. That is, the projection of part of the structure of the adhesive layer 36 in the thickness direction X2 of the display part 31 will exceed the projection of the protective layer 332 in the thickness direction X2 of the display part 31, and cover at least part of the stepped structure T. On this basis, during the injection molding process, the adhesive layer 36 can play a role in blocking the air leakage channel, so that the preparation reliability of the glue frame 40 can be improved when the dike structure 20 is directly cancelled.

[0113] Therefore, for the display device 300 prepared by using the display module 200 provided by the embodiments of the present application, the dike structure 20 can also be cancelled while ensuring the structural reliability of the glue frame 40. And the thickness of the adhesive layer 36 is usually smaller than that of the dike structure 20. Therefore, this design can also reduce the influence on the internal layout of the display device 300 and release the space of the whole machine.

[0114] In some embodiments, as Figure 11 shown, the adhesive layer 36 includes an overflow part 361 arranged in a fitting manner with the stepped structure T. In the thickness direction X2 of the display part 31, the size of the bonding part 331 is H1, and the size of the overflow part 361 is H2. Among them, H1 and H2 satisfy: 0.5H1 ≤ H2 ≤ 3H1. Optionally, H2 can be equal to one of 0.5H1, H1, 1.5H1, 2H1, and 3H1.

[0115] The overflow part 361 is part of the structure of the adhesive layer 36 that exceeds the protective layer 332. In order to meet the formation requirement of the overflow part 361, the adhesive layer 36 needs to be thickened. Therefore, in the embodiments of the present application, the size H2 of the overflow part 361 is set to be not less than half of the size H1 of the bonding part 331, so as to meet the formation requirement of the overflow part 361. At the same time, it can also make the overflow part 361 better cover the stepped structure T and improve the preparation yield of the glue frame 40. At the same time, in the embodiments of the present application, the size H2 of the overflow part 361 is also set to be not greater than three times the size H1 of the bonding part 331, so as to reduce the occupation of the internal space of the display device 300 by the overflow part 361 and release the space of the whole machine.

[0116] Fourthly, please refer to Figure 12 , the embodiments of the present application provide a display device 300. The display device 300 is prepared by the injection mold 100 in any of the foregoing embodiments. The display device 300 includes a display module 200 and a glue frame 40. The glue frame 40 is arranged on the periphery of the display module 200. Among them, the display device 300 does not include the dike structure 20.

[0117] It should be noted that the display device 300 provided in the embodiments of the present application has the beneficial effects mentioned in the injection mold 100 in any of the foregoing embodiments. For specific details, please refer to the foregoing introduction to the injection mold 100, and the embodiments of the present application will not be elaborated herein.

[0118] In addition, as can be seen from the foregoing content, according to different actual needs, the display device 300 may include at least one of the anti-adhesion layer 34 and the overflow portion 361, or the display device 300 may not include the anti-adhesion layer 34 and the overflow portion 361. The embodiments of the present application do not limit this.

[0119] Fifth aspect, please refer to Figure 13 and FIG. 14. The embodiments of the present application provide a method for manufacturing a display device 300, including:

[0120] S100: Dispose the first mold core in contact with the display module.

[0121] Please refer to Figure 14a . In step S100, the first mold core 10 is the first mold core 10 in the injection mold 100 in any of the foregoing embodiments. Specifically, the first mold core 10 has opposite first surface 11 and second surface 12 in the first direction X1. The first surface 11 is used to contact the display module 200. The first mold core 10 includes an injection channel 14 and a cavity 13 formed by recessing from the first surface 11. The injection channel 14 and the cavity 13 are arranged at intervals. The cavity 13 extends through the first mold core 10 in the first direction X1, and the first mold core 10 further includes a fixing structure 15 for contacting and disposing with the dam structure 20.

[0122] S110: Form a dam structure in the cavity.

[0123] Please refer to Figure 14b . In step S110, the dam structure 20 and the first mold core 10 are not two independent structures. The formation of the dam structure 20 depends on the first mold core 10, and the size and shape of the dam structure 20 depend on the size and shape of the cavity 13. Optionally, in the direction from the first surface 11 to the second surface 12, the size of the cavity 13 shows a gradually increasing trend in the second direction Y1.

[0124] S120: Form a glue frame in the injection channel.

[0125] Please refer to Figure 14c . In step S120, a glue frame 40 is formed by pouring glue into the injection channel 14. In this process, the dam structure 20 can block the air leakage channel at the position of the step structure T, thereby improving the preparation reliability of the glue frame 40.

[0126] S130: Separate the first mold core and the dam structure together from the display module.

[0127] Please refer to Figure 14d In step S130, the fixing structure 15 in the first mold core 10 can drive the dam structure 20 away from the display module 200 together. As a result, there is no dam structure 20 in the finally formed display device 300, thereby reducing the influence of the dam structure 20 on the internal layout of the display device 300 and releasing the space of the whole machine.

[0128] Although the embodiments disclosed in the present application are as above, the content described is only an embodiment adopted for the convenience of understanding the present application and is not used to limit the present invention. Any person skilled in the art within the technical field to which the present application pertains can make any modifications and changes in the form of implementation and details without departing from the spirit and scope disclosed in the present application. However, the protection scope of the present application shall still be subject to the scope defined by the appended claims.

[0129] As described above, only the specific implementation manners of the present application are involved. Those skilled in the art can clearly understand that for the convenience and brevity of description, the replacement of other connection manners described above and the like can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of various equivalent modifications or replacements, and these modifications or replacements should all be covered within the protection scope of the present application.

Claims

1. An injection mold for forming a plastic frame on a display module, characterized in that: The injection mold comprises a first mold and a second mold, the first mold comprises a first mold core and a first mold frame arranged outside the first mold core, and the second mold comprises a second mold core and a second mold frame arranged outside the second mold core; The first mold core has a first surface and a second surface opposite to each other in a first direction, the first surface is used to contact the display module, the first mold core comprises an injection channel and a cavity formed by a depression of the first surface, and the injection channel is spaced apart from the cavity; The cavity is used for injection molding to form a dam structure, and the first mold core includes a fixed structure for contacting the dam structure, and the injection mold drives the dam structure away from the display module through the fixed structure.

2. The injection mold according to claim 1, characterized in that: The mold cavity is arranged along the first direction and penetrates the first mold core.

3. The injection mold according to claim 2, characterized in that: The fixing structure includes a side wall of the mold cavity, the mold cavity includes a first sub-cavity and a second sub-cavity connected and arranged in the first direction, and the second sub-cavity is located on a side of the first sub-cavity facing the second surface; The maximum dimension of the second sub-cavity in the second direction is greater than the maximum dimension of the first sub-cavity in the second direction, and the second direction is perpendicular to the first direction.

4. The injection mold according to claim 3, characterized in that: In the direction from the first surface to the second surface, the size of the cavity in the second direction tends to gradually increase.

5. The injection mold according to claim 2, characterized in that: The fixing structure comprises a protruding structure protrudingly connected to the side wall of the cavity, and the protruding structure is used for being arranged in contact with the dam structure.

6. The injection mold according to claim 5, characterized in that: At least part of the protruding structure is used for inserting and matching with the dam structure; or, the protruding structure includes a supporting surface facing away from the first surface, and the supporting surface is located in the cavity and is spaced apart from the second surface in the first direction.

7. The injection mold according to claim 1, characterized in that: The mold cavity has a first opening in the first direction away from the second surface, and a size of the first opening in the second direction is L, 0.2 mm≤L≤2 mm; The second direction is perpendicular to the first direction.

8. The injection mold according to claim 1, characterized in that: The first surface includes a first sub-surface located between the mold cavity and the injection channel, and a second sub-surface located on a side of the mold cavity away from the injection channel; Wherein, in the first direction, the second sub-surface is located on a side of the first sub-surface close to the second surface.

9. A display module, characterized in that: The display module is arranged by bonding the injection mold according to any one of claims 1 to 8 with the plastic frame; the display module comprises: Display unit; A cover plate, arranged on one side of the display portion; A composite functional layer is arranged on a side of the display portion facing away from the cover plate; The viscosity-reducing layer is arranged on a side of the composite functional layer away from the display portion, and the viscosity of the viscosity-reducing layer is lower than the viscosity of at least part of the film layer in the composite functional layer.

10. The display module according to claim 9, characterized in that: A surface of the composite functional layer facing away from the display portion forms a step structure at an edge region in a third direction, and a thickness direction of the display portion intersects with the third direction; Wherein, the anti-adhesion layer at least partially covers the step structure.

11. The display module according to claim 10, characterized in that: The composite functional layer comprises a binding portion and a protective layer arranged on a side of the binding portion away from the display portion, and in the third direction, the binding portion exceeds the protective layer and forms the step structure; The display module also includes a bending portion, through which the binding portion is bent to a side of the display portion away from the cover plate, one end of the display portion along the fourth direction is connected to the bending portion, and the thickness direction of the display portion, the third direction and the fourth direction intersect each other.

12. The display module according to claim 11, characterized in that: The composite functional layer further comprises a supporting layer arranged on a side of the binding portion facing the display portion, and in the third direction, the supporting layer exceeds the binding portion; The projection of the anti-viscosity layer in the thickness direction of the display part is located within the projection of the support layer in the thickness direction of the display part.

13. The display module according to claim 9, characterized in that: The material of the adhesion-reducing layer includes at least one of silicon dioxide and silicone oil.

14. A display module, characterized in that: include: Display unit; A cover plate, arranged on one side of the display portion; A binding portion, arranged on a side of the display portion away from the cover plate; a protective layer, arranged on a side of the binding portion away from the display portion, the binding portion exceeds the protective layer in a third direction to form a step structure, and a thickness direction of the display portion intersects with the third direction; An adhesive layer, partially disposed between the binding portion and the protective layer; Wherein, a part of the structure in the adhesive layer is arranged to fit the step structure.

15. The display module according to claim 14, characterized in that: The adhesive layer includes an overflow portion that is arranged to fit the step structure, and in the thickness direction of the display portion, the size of the binding portion is H1, and the size of the overflow portion is H2; Among them, H1 and H2 satisfy: 0.5H1≤H2≤3H1.

16. A display device, characterized in that: The display device is prepared by the injection mold according to any one of claims 1 to 8, wherein the display device comprises the display module and the plastic frame, and the plastic frame is arranged on the peripheral side of the display module; Wherein, the display device does not include the dam structure.

17. A method for preparing a display device, characterized in that: include: The first mold core is fitted with the display module, wherein the first mold core is the first mold core in the injection mold according to any one of claims 1 to 8, and the mold cavity is arranged to penetrate the first mold core along the first direction; forming the dam structure in the cavity; forming the plastic frame in the injection molding channel; The first mold core and the dam structure are separated from the display module.

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