Display module, display device, manufacturing method thereof, and injection mold

Abstract

The embodiment of the present application provides a display module, a display device, a manufacturing method thereof, and an injection mold. The side of the display module is injection molded by the injection mold. The display module includes: a protective cover plate, a display substrate, and a first composite functional layer stacked in sequence; the side of the first composite functional layer is retracted relative to the side of the display substrate, so that when the injection mold encloses the display module to form an injection cavity, the side of the first composite functional layer can be fixedly connected to the first side of the injection mold to form a closed injection cavity. The embodiment of the present application provides a first composite functional layer that is retracted relative to the display substrate on the backlight side of the display module, so that the side of the first composite functional layer can be used to fix the injection mold, so that a closed injection cavity can be formed without the injection mold squeezing the upper surface of the display module, reducing the deformation caused by the injection mold squeezing the display module, making the light scattered evenly, thereby avoiding the formation of mold marks on the display surface and improving the display effect.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of display devices, and in particular to a display module, a display device, a manufacturing method thereof, and an injection mold. Background Art

[0002] Display screens usually use a snap-on middle frame to protect the display module. In order to increase the visual impact of the display screen on the user, an injection molding (Insert Molding) technology is proposed to bond the middle frame with injection glue to narrow the border of the display screen, and it can also be used to enhance the structural strength of the flexible display panel in the display module. However, the current injection molding scheme used for the display module, in order to form a closed injection cavity, will cause the injection mold to squeeze the display module, and the backlight side of the display module is not rigid. The functional parts will be slightly deformed in the squeezed area, changing the light path of the display module at that location, and the uneven scattering will cause a difference in light and dark between the squeezed area and the unsqueezed area, which will then produce a visible mold print on the display surface, which will have an adverse effect on the display effect of the display screen and affect the user experience.

[0003] It should be noted that the information distinguishing the invention in the above background technology is only used to enhance the understanding of the background of the invention, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the invention

[0004] The embodiments of the present application provide a display module, a display device, a manufacturing method thereof, and an injection mold, which are intended to reduce or even eliminate deformation caused by squeezing the display module by the injection mold, thereby avoiding mold marks on the display surface and improving the display effect of the display screen.

[0005] In one aspect, an embodiment of the present application provides a display module,

[0006] The side of the display module is injection molded by an injection mold, and the display module comprises: a protective cover plate, a display substrate and a first composite functional layer stacked in sequence;

[0007] The side surface of the first composite functional layer is retracted relative to the side surface of the display substrate, and the side surface of the first composite functional layer can be fixedly connected to the first side surface of the injection mold to form a closed injection cavity.

[0008] Optionally, the side surface of the display substrate is retracted relative to the side surface of the protective cover plate, so that when the injection mold surrounds the side surface of the first composite functional layer and the display substrate, the side surface of the protective cover plate can be fixedly connected to the second side surface of the injection mold to form the closed injection cavity;

[0009] Among them, the inner surface of the injection cavity includes at least: the upper surface of the protective cover plate between the side of the display substrate and the side of the protective cover plate, the side of the display substrate, and part or all of the upper surface of the display module between the side of the first composite functional layer and the side of the display substrate.

[0010] Optionally, it further comprises: a second composite functional layer located between the first composite functional layer and the display substrate;

[0011] The side surface of the second composite functional layer and the side surface of the display substrate are in the same plane, so that the side surface of the first composite functional layer is retracted relative to the side surface of the second composite functional layer.

[0012] Optionally, the material of the first composite functional layer and / or the second composite functional layer includes copper or aluminum.

[0013] Optionally, the thickness of the first composite functional layer and / or the second composite functional layer is any value between 0.02 mm and 0.05 mm;

[0014] And / or, the distance between the side surface of the first composite functional layer and the side surface of the second composite functional layer is any value between 0.3 mm and 0.5 mm.

[0015] Optionally, it further comprises: a support member located on one side of the display substrate and surrounding the first composite functional layer;

[0016] Wherein, the thickness of the first composite functional layer is greater than the thickness of the support member, so that there is a height difference greater than a preset value between the first composite functional layer and the support member.

[0017] Optionally, the support member is made of stainless steel.

[0018] Optionally, the thickness of the first composite functional layer is any value between 0.05 mm and 0.075 mm;

[0019] And / or, the thickness of the support member is 0.02 mm;

[0020] And / or, the width of the support member along the side surface of the first composite functional layer toward the side surface of the display substrate is 0.4 mm;

[0021] And / or, a distance between a side surface of the first composite functional layer and a side surface of the display substrate is any value between 0.5 mm and 1 mm.

[0022] Optionally, the injection cavity contacts a side surface of the first composite functional layer;

[0023] Wherein, the height of the injection cavity within a preset width from the side of the first composite functional layer is smaller than the thickness of the first composite functional layer.

[0024] Optionally, there is a preset width between the injection cavity and the side surface of the first composite functional layer;

[0025] The height of the injection cavity is greater than the thickness of the first composite functional layer.

[0026] Optionally, the display substrate comprises: a display area and a non-display area surrounding the display area;

[0027] The display substrate further comprises a bending region in the non-display region; the display substrate is bent in the bending region so that one end of the display substrate is bent to a surface of the first composite functional layer away from the display substrate;

[0028] Wherein, the display substrate is bent in the bending area to form a display substrate channel, and the display substrate channel is communicated with the injection cavity.

[0029] Optionally, the injection cavity comprises: a glue outlet located in the bending zone and a glue inlet located at the opposite end of the display module relative to the glue outlet;

[0030] The plastic inlet is used to allow the plastic fluid to enter the injection cavity and the display substrate channel connected to the injection cavity, and flow out through the plastic outlet, so that the plastic fluid fills the injection cavity and the display substrate channel connected to the injection cavity.

[0031] Compared with the prior art, the display module provided in the embodiment of the present application has the following advantages:

[0032] (1) The display module provided in the embodiment of the present application provides a first composite functional layer on the backlight side of the display module that is retracted relative to the display substrate, so that the side surface of the first composite functional layer can be used to fix the first side surface of the injection mold to form a closed injection cavity. As a result, there is no need to extrude the upper surface of the display module to form a closed injection cavity, and the injection material can be prevented from overflowing. When injection molding is performed around the display module, the deformation of the display module caused by the injection mold being squeezed can be reduced or even eliminated, and the difference in brightness between regions caused by uneven scattering can be avoided, thereby avoiding the formation of mold marks on the display surface and improving the display effect of the display screen.

[0033] (2) The display module provided in the embodiment of the present application provides a first composite functional layer that is retracted relative to the display substrate on the backlight side of the display module, which can also play a role in shielding electromagnetic interference and / or dissipating heat generated by the display substrate, thereby helping to improve the performance stability of the display module.

[0034] In yet another aspect, the present application further provides a display device, comprising: a display module as described in any one of the above embodiments;

[0035] The display device further comprises: a plastic frame surrounding and bonding the side surface of the display module and a middle frame surrounding and bonding the plastic frame;

[0036] The plastic frame is obtained by injecting plastic fluid into an injection cavity and solidifying the plastic fluid after filling the injection cavity. The outer surface of the plastic frame is the same surface as the inner surface of the injection cavity.

[0037] The display device provided in the embodiment of the present application includes the display module in the above embodiment, and has the same or similar advantages as the display module provided in the above embodiment. In addition, the display device provided in the embodiment of the present application uses a plastic frame obtained by injection molding to bond the middle frame, which is conducive to further narrowing the frame of the display device, thereby improving the visual impact of the display device on the user.

[0038] The display device provided in the embodiment of the present application includes the display panel in the above embodiment and also has all the advantages of the above display panel.

[0039] In yet another aspect, the present application further provides an injection mold, the injection mold comprising an upper mold core and a lower mold core;

[0040] The upper mold core and the lower mold core are used to enclose the display module according to any one of claims 1 to 12 to form an injection molding cavity surrounding the side of the display module;

[0041] The first side surface of the injection mold is used to fix and connect the side surface of the first composite functional layer to form the closed injection cavity.

[0042] The injection mold provided in the embodiment of the present application is used to injection mold the display module in the above embodiment. By fixedly connecting with the side of the first composite functional layer, the extrusion on the upper surface of the display module is reduced, and the display module has similar advantages as the above embodiment.

[0043] In another aspect, the present application further provides a method for manufacturing a display device, comprising:

[0044] Providing a display module as described in any one of the above embodiments;

[0045] Providing an injection mold so that the injection mold encloses the display module to form an injection cavity surrounding the side of the display module; wherein the side of the first composite functional layer of the display module is fixedly connected to the first side of the injection mold to form the closed injection cavity;

[0046] Injecting plastic fluid into the injection cavity in a vacuum environment;

[0047] After the plastic fluid fills the injection cavity, solidifying the plastic fluid to obtain molded plastic;

[0048] Cleaning the excess plastic of the molded plastic at the plastic inlet and plastic outlet, and removing the injection mold to obtain a plastic frame;

[0049] A middle frame is provided, and the middle frame surrounds and is bonded to the plastic frame.

[0050] The manufacturing method of the display device provided in the embodiment of the present application performs injection molding on the display module in the above embodiment to obtain a display device, which is fixedly connected to the side of the first composite functional layer to reduce the extrusion on the upper surface of the display module and has similar advantages to the above product embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this application. The technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0052] Figure 1 A schematic diagram showing the injection molding principle of a display module in the prior art is shown;

[0053] Figure 2 A partial cross-sectional structural schematic diagram of a display module fixedly connected to an injection mold in an embodiment provided by the present application is shown;

[0054] Figure 3 A schematic cross-sectional structure diagram of a display module in an embodiment provided by the present application is shown;

[0055] Figure 4 A schematic cross-sectional structure diagram of another display module in an embodiment provided by the present application is shown;

[0056] Figure 5 A schematic structural diagram of an annular support member in an embodiment provided by the present application is shown;

[0057] Figure 6 A schematic cross-sectional structure diagram of a display device in an embodiment provided by the present application is shown;

[0058] Figure 7A schematic cross-sectional structure diagram of another display device in an embodiment provided by the present application is shown;

[0059] Figure 8 A schematic cross-sectional structure diagram of a display module for injection molding in one embodiment provided by the present application is shown;

[0060] Fig. 9 A schematic diagram of a partial cross-sectional structure of another display module for injection molding in an embodiment provided by the present application is shown;

[0061] Fig.10 A schematic diagram of a partial cross-sectional structure of another display module for injection molding in an embodiment provided by the present application is shown;

[0062] Fig.11 A schematic diagram of a partial cross-sectional structure of another display module for injection molding in an embodiment provided by the present application is shown;

[0063] Fig.12 A flowchart showing a method for manufacturing a display device in an embodiment provided by the present application is shown;

[0064] Fig.13 A flowchart of the steps of a method for manufacturing a plastic frame in an embodiment provided by the present application is shown.

[0065] Description of reference numerals:

[0066] 11. Protective cover; 12. Optical adhesive; 13. Polarizing layer; 14. Display substrate; 15. Composite film; 16. Foam layer; 17. Flexible circuit substrate; 21. First composite functional layer; 22. Second composite functional layer; 23. Support member; 30. Plastic fluid; 31. Plastic frame; 41. Glue inlet; 42. Glue outlet; 50. Injection cavity; 51. Upper mold core; 52. Lower mold core; 53. Upper mold frame; 54. Lower mold frame. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0068] In addition to the advantages of high brightness, high luminous efficiency, and low energy consumption, organic light emitting diode display devices (OLED) can also provide flexible display panel designs. In order to achieve a narrower display screen border, the OLED flexible display panel needs to bend the integrated circuit chip (IC) and other devices that cannot be made transparent to the backlight side, and the structure of the bending part needs to be supported and fixed to ensure the structural strength. In order to support and fix the structure of the bending part, it is necessary to inject glue into the channel of the bending part and solidify it. As the display screen border continues to narrow, the bending area of ​​the current flexible display panel is also narrowed. Due to the limitations of equipment and injection accuracy, the difficulty of injecting glue in the bending structure is gradually increasing.

[0069] Considering that the current display screen middle frame also needs to be further narrowed to enhance the user's visual impact of the display screen, it is currently proposed to perform injection molding on the display module. This can not only narrow the border of the display screen by bonding the middle frame with the injection glue, but also allow the injection glue to enter the channel formed by the bending of the flexible display panel and cover the bending part of the OLED flexible display panel. After the glue cures, the flexible display panel is fixed and supported.

[0070] Reference Figure 1 , Figure 1 FIG. 1 shows a schematic diagram of the injection molding principle of a display module in the prior art. Figure 1As shown, the inventors have discovered that in the current injection molding scheme used for the display module, in order to form a closed injection cavity on the side of the backlight side of the display module, the injection mold often extrude the composite film 15 on the backlight side of the display module and the following components such as the polarizing layer 13, the display substrate 14, and the optical adhesive 12. However, the backlight side of the display module has no rigid protective cover plate for structural support, and is prone to micro-deformation under the force of extrusion. The deformed module not only affects the light output path, but also changes the path of the reflected light from the external ambient light, resulting in uneven scattering, resulting in a difference in light and dark between the squeezed area and the non-squeezed area, and then visually producing a mold imprint in the squeezed area of ​​the display surface, which has an adverse effect on the display effect of the display screen and affects the user's perception. To this end, the embodiments of the present application propose a display module, a display device, a manufacturing method, and an injection mold. By providing a first composite functional layer that is retracted relative to a display substrate on the backlight side of the display module, the side surface of the first composite functional layer can be used to fix the first side surface of the injection mold to form a closed injection cavity. As a result, there is no need to extrude the upper surface of the display module to form a closed injection cavity, and overflow of the injection molding material can be prevented. When injection molding is performed around the side of the display module, deformation of the display module caused by extrusion of the injection mold is reduced or even eliminated, and uneven scattering leading to differences in light and dark between regions is avoided, thereby avoiding mold imprints on the display surface and improving the display effect of the display screen.

[0071] The embodiments of the present application are described below with reference to the accompanying drawings.

[0072] Reference Figure 2 , Figure 2 FIG. 1 is a schematic diagram of a partial cross-sectional structure of a display module fixedly connected to an injection mold in an embodiment provided by the present application. Figure 2 As shown, an embodiment of the present application provides a display module, the side of the display module is injection molded by an injection mold, and the display module includes: a protection cover plate 11, a display substrate 14 and a first composite functional layer 21 stacked upward in sequence.

[0073] The injection mold performs injection molding on a circle around the side of the display module to form a plastic frame 31 for the circle around the side of the display module. The plastic frame 31 is used to connect the middle frame surrounding the plastic frame 31 to support and protect the structure of the display module.

[0074] The display module may include a light-emitting side and a backlight side that are arranged opposite to each other, wherein the first composite functional layer 21 is located on the backlight side of the display module, and the protective cover plate 11 is located on the light-emitting side of the display module.

[0075] In some embodiments, the protective cover 11 can be made of transparent glass.

[0076] The display module may be an OLED display module, and correspondingly, the display substrate 14 may be an OLED liquid crystal display substrate 14 .

[0077] The first composite functional layer 21 can be used to dissipate heat generated by the display substrate 14 during operation.

[0078] The side surface of the first composite functional layer 21 is retracted relative to the side surface of the display substrate 14 so that when the injection mold encloses the display module to form an injection cavity, the side surface of the first composite functional layer 21 can be fixedly connected to the first side surface of the injection mold to form a closed injection cavity 50.

[0079] The injection molding cavity 50 may surround the side surface of the display module to form a plastic frame surrounding the side surface of the display module.

[0080] The injection mold may be a shell surrounding the display module, including a first side surface close to the first composite functional layer and a second side surface away from the first composite functional layer.

[0081] In some optional embodiments, the thickness of the injection cavity 50 beyond the preset width from the side of the first composite functional layer 21 may be greater than the thickness of the first composite functional layer 21, so that after the plastic frame 31 is obtained by injection molding, the thickness of the plastic frame 31 beyond the preset width from the side of the first composite functional layer 21 is greater than the thickness of the first composite functional layer 21, so that the plastic frame 31 can achieve better structural fixation and support for the display module.

[0082] Specifically, in order to form the injection cavity 50 , the injection mold may include a housing surrounding the side of the display module, and the housing includes a groove opening downward.

[0083] Among them, the width of the lower surface of the groove wall on one side for fixing the side of the first composite functional layer 21 can be a preset width, and the preset width can be smaller than the distance between the side of the first composite functional layer 21 and the side of the display substrate 14, so that the cavity height of the injection cavity 50 on the side close to the side of the display substrate 14 can be greater than the thickness of the first composite functional layer 21, thereby achieving better structural fixation and support.

[0084] Exemplarily, the distance between the side surface of the first composite functional layer 21 and the side surface of the display substrate 14 is 0.4 mm, and the preset width can be 0.3 mm. Then, the distance between the side surface of the injection cavity 50 close to the display substrate 14 and the display substrate 14 is 0.1 mm, so that the cavity height of the injection cavity 50 within 0.1 mm on the side close to the display substrate 14 can be greater than the thickness of the first composite functional layer 21.

[0085] The first composite functional layer 21 can play a role in heat dissipation and / or electromagnetic interference shielding.

[0086] In order to achieve good heat dissipation and provide sufficient structural support for the extrusion of the injection mold from the side, in some embodiments, the material of the first composite functional layer 21 may include copper or aluminum.

[0087] Taking a circular display module as an example, the distance between the side surface of the first composite functional layer 21 and the side surface of the display substrate 14 may be constant, and the plane geometric center of the first composite functional layer 21 may coincide with the plane geometric center of the display substrate 14 .

[0088] In some embodiments, the distance between the side surface of the first composite functional layer 21 and the side surface of the display substrate 14 may be any value between 0.3 mm and 1 mm.

[0089] In some optional embodiments, in order to avoid forming an extrusion pressure on the upper surface of the display module, the injection mold may not contact the upper surface of the display module in the area between the side surface of the first composite functional layer 21 and the side surface of the display substrate 14, that is, in the area between the side surface of the first composite functional layer 21 and the side surface of the display substrate 14, there may be a gap between the injection mold and the upper surface of the display module.

[0090] For example, assuming that the thickness of the first heat dissipation layer is 0.05 mm, the height at which the injection mold is fixedly connected to the first heat dissipation layer can be 0.035 mm. Then, in the area between the side of the first composite functional layer 21 and the side of the display substrate 14, the gap between the injection mold and the upper surface of the display module can be 0.015 mm.

[0091] Since the display module in the embodiment of the present application can be bonded to the middle frame by injecting glue into the injection cavity 50 and the solidified injection colloid can be used to provide structural support to the display substrate 14 with the solidified injection colloid, the display module in the embodiment of the present application can be used to realize a display device with a narrow bezel, specifically a display device for smart devices such as smart watches, mobile phones or tablet computers.

[0092] To this end, in some embodiments, the display module may be circular or rectangular. Accordingly, the injection molding cavity 50 may be a ring-shaped injection molding cavity 50 surrounding a circular display module, or a rectangular frame injection molding cavity 50 surrounding a rectangular display module.

[0093] Through the above embodiments, a display module is provided. By providing a first composite functional layer 21 that is retracted relative to the display substrate 14 on the backlight side of the display module, the side surface of the first composite functional layer 21 can be used to fix the first side surface of the injection mold to form a closed injection cavity 50. Therefore, there is no need to extrude the upper surface of the display module to form the closed injection cavity 50, and overflow of the injection material can be prevented. When injection molding is performed around the display module, deformation of the display module caused by extrusion of the injection mold is reduced or even eliminated, and uneven scattering leading to light and dark differences between regions is avoided, thereby avoiding mold imprints on the display surface and improving the display effect of the display screen.

[0094] In order to utilize the protective cover 11 to protect the display substrate 14 and other functional parts on the side of the display module, it can be considered that the side of the protective cover 11 is expanded relative to the side of the display substrate 14. For this purpose, in some optional embodiments, the present application also provides a display module, wherein the side of the display substrate 14 is retracted relative to the side of the protective cover 11, so that when the injection mold surrounds the first composite functional layer and the side of the display substrate, the side of the protective cover 11 can be fixedly connected to the second side of the injection mold to form an injection cavity 50.

[0095] In this case, the injection cavity 50 at least surrounds the first composite functional layer and the display substrate.

[0096] Among them, the inner surface of the injection cavity 50 includes at least: the upper surface of the protective cover 11 between the side of the display substrate 14 and the side of the protective cover 11, the side of the display substrate 14, and part or all of the upper surface of the display module between the side of the first composite functional layer 21 and the side of the display substrate 14.

[0097] In the embodiment of the present application, since the display substrate 14 is retracted and the side of the protective cover 11 is fixedly connected to the injection mold, the formed injection cavity 50 can use the side of the display substrate 14 as the inner surface of the cavity. By performing injection molding in the injection cavity 50, the plastic frame 31 can better support and protect the structure of functional parts such as the display substrate 14.

[0098] Without considering the influence of the structural strength of the display substrate 14, in order to further narrow the border of the display screen, in some optional embodiments, the side of the display substrate 14 can also be in the same plane as the side of the protective cover plate 11, so that the second side of the injection mold is fixedly connected to the side of the protective cover plate 11 while also being fixedly connected to the side of the display substrate 14, forming an injection cavity 50 surrounding the side of the first composite functional layer 21.

[0099] Considering the processing accuracy of current processing equipment, technology and materials, in order to prevent the leakage of the plastic fluid 30, the side of the injection mold and the first composite functional layer 21 can be fixedly connected by interference fit. Therefore, the side of the injection mold may squeeze the side of the first composite functional layer 21, and if the material under the first composite functional layer 21 has a low structural strength, it may be deformed when the side of the first composite functional layer 21 is wrinkled and deformed. In order to enhance the structural strength of the backlight side of the display module, in some optional embodiments, the present application can adopt a double-layer metal layer design.

[0100] Reference Figure 3 , Figure 3 FIG. 2 shows a schematic cross-sectional structure diagram of a display module in an embodiment provided by the present application. Figure 3 As shown, for this purpose, in some optional embodiments, the present application also provides a display module, further comprising: a second composite functional layer 22 located between the first composite functional layer 21 and the display substrate 14 .

[0101] The second composite functional layer 22 can also be used to dissipate heat and / or shield electromagnetic interference. Therefore, the second composite functional layer 22 can be made of the same material as the first composite functional layer 21. To this end, in some optional embodiments, the material of the first composite functional layer 21 and / or the second composite functional layer 22 can include copper or aluminum.

[0102] In order to facilitate alignment processing and to facilitate the covering and structural support of the upper surface of the display substrate 14, the side of the second composite functional layer 22 is in the same plane as the side of the display substrate 14, so that the side of the first composite functional layer 21 is retracted relative to the side of the second composite functional layer 22.

[0103] Among them, since the first composite functional layer 21 is above the second composite functional layer 22, the side surface of the first composite functional layer 21 is retracted relative to the side surface of the second composite functional layer 22, and there is a height difference between the side surface of the first composite functional layer 21 and the second composite functional layer 22, and the height difference is equal to the thickness of the first composite functional layer 21.

[0104] In order to realize the thin and light design of electronic devices such as mobile phones and watches, the current display module has also been put forward to be thin and light. Under the processing accuracy of the corresponding injection mold, the thickness of the first composite functional layer 21 cannot be too small, otherwise the side cannot be smoothly fixedly connected to the injection mold. For this reason, it is necessary to take into account the thin and light design requirements of the display module and the mold fixed connection requirements. In addition, insufficient indentation of the first composite functional layer 21 will make it difficult to smoothly fix the injection mold, and the plastic fluid 30 will not be able to be bonded to the upper surface of the display module between the side of the first composite functional layer 21 and the side of the display substrate 14 in large quantities. Excessive indentation of the first composite functional layer 21 will cause the heat dissipation capacity of the backlight side of the display module to decrease, and the structural support will be weakened. For this reason, it is also necessary to take into account the design requirements of the injection cavity 50 and the heat dissipation capacity and structural strength of the display module.

[0105] In view of this, the present application comprehensively considers various requirements of the display module. In some optional implementations, the present application further provides a display module, wherein:

[0106] The thickness of the first composite functional layer 21 and / or the second composite functional layer 22 is any value between 0.02 mm and 0.05 mm.

[0107] For example, the thickness of the first composite functional layer 21 may be 0.03 mm, and the thickness of the second composite functional layer 22 may be 0.04 mm.

[0108] And / or, the distance between the side surface of the first composite functional layer 21 and the side surface of the second composite functional layer 22 is any value between 0.3 mm and 0.5 mm.

[0109] For example, the distance between the side surface of the first composite functional layer 21 and the side surface of the second composite functional layer 22 may be 0.4 mm.

[0110] In some other optional embodiments, a single metal layer combined with a support member 23 may be used to improve the structural strength of the squeezed area of ​​the display module during the injection molding process.

[0111] Reference Figure 4 , Figure 4 FIG. 2 shows a cross-sectional structure diagram of another display module in an embodiment provided by the present application. Figure 4 As shown, for this purpose, in some optional embodiments, the present application further provides a display module, further comprising: a support member 23 located on one side of the display substrate 14 and surrounding the first composite functional layer 21 .

[0112] In order to improve the structural support capability, the hardness of the support member 23 may be greater than that of the first composite functional layer 21. To this end, in some optional embodiments, the material of the support member 23 includes stainless steel.

[0113] Reference Figure 5 , Figure 5 FIG. 2 is a schematic diagram showing the structure of an annular support member 23 in an embodiment provided by the present application. Figure 5 As shown, taking a circular display module as an example, the support member 23 may be an annular sheet.

[0114] The thickness of the first composite functional layer 21 is greater than the thickness of the support member 23 , so that there is a height difference between the first composite functional layer 21 and the support member 23 that is greater than a preset value.

[0115] Specifically, the preset value may be determined according to the structural data and process accuracy of the injection mold. Exemplarily, the preset value may be 0.02 mm.

[0116] Exemplarily, due to the single-layer metal design, the thickness of the first composite functional layer 21 can be 0.05 mm. In order to reserve a position for the fixed connection of the mold, the thickness of the support member 23 can be 0.02 mm. Then, the height difference between the first composite functional layer 21 and the support member 23 is 0.03 mm, which is greater than the preset value of 0.02 mm.

[0117] In the case where the side of the first composite functional layer 21 is fixedly connected to the injection mold and a closed injection cavity 50 is formed, even if the injection mold contacts the upper surface of the display module, the extrusion force formed is small, and the support member 23 can form a strong structural protection for the display substrate 14. In this case, the injection mold can contact the upper surface of the display module, and it is not easy to cause deformation of the display module on the backlight side, which will not affect the light emitting path of the display module, and thus no mold print will appear on the display surface. For this reason, in some optional embodiments, in the area between the side of the first composite functional layer 21 and the side of the display substrate 14, the injection mold can contact part of the upper surface of the support member 23 of the display module.

[0118] The thickness of the support member 23 needs to be smaller than the first composite functional layer 21 so that the injection mold is fixedly connected to the side of the first composite functional layer 21, and the width of the support member 23 needs to be larger than the lower surface of the injection mold to prevent the injection mold from squeezing the upper surface of the display module outside the support member 23. To this end, in some optional embodiments, the present application also provides a display module, wherein the thickness of the first composite functional layer 21 is any value between 0.05 mm and 0.075 mm.

[0119] Exemplarily, the thickness of the first composite functional layer 21 may be 0.05 mm.

[0120] And / or, the thickness of the support member 23 is 0.02 mm.

[0121] And / or, the width of the support member 23 along the side surface of the first composite functional layer 21 toward the side surface of the display substrate 14 is 0.4 mm.

[0122] Accordingly, the width of the lower surface of the injection mold along the direction from the side surface of the first composite functional layer 21 toward the side surface of the display substrate 14 may be 0.3 mm.

[0123] And / or, the distance between the side surface of the first composite functional layer 21 and the side surface of the display substrate 14 is any value between 0.5 mm and 1 mm.

[0124] Exemplarily, the distance between the side surface of the first composite functional layer 21 and the side surface of the display substrate 14 may be 0.6 mm.

[0125] like Figure 3 or Figure 4 As shown, in order to further reduce the impact of the extrusion of the injection molding device on the display substrate 14, a foam layer 16 for buffering can be added under the first composite functional layer 21. To this end, in some optional embodiments, the present application also provides a display module, further comprising: a foam layer 16 located on the side of the display substrate 14 away from the protective cover 11.

[0126] The foam layer 16 may be located between the first composite functional layer 21 and the display substrate 14. Furthermore, when a double-layer metal layer design is adopted, the foam layer 16 may be located between the second composite functional layer 22 and the display substrate 14.

[0127] In the region between the side surface of the first composite functional layer 21 and the side surface of the display substrate 14, when there is a gap between the injection mold and the upper surface of the display module, the injection cavity 50 can extend to the side surface of the first composite functional layer 21. To this end, in some optional embodiments, the present application further provides a display module, wherein the injection cavity 50 contacts the side surface of the first composite functional layer 21.

[0128] The height of the injection cavity 50 within a preset width from the side of the first composite functional layer 21 is smaller than the thickness of the first composite functional layer 21 .

[0129] In order to achieve better structural support, the display substrate 14, the protective cover plate 11 and other components are bonded, and the height of the injection cavity 50 beyond the preset width of the side of the first composite functional layer 21 is greater than the thickness of the first composite functional layer 21, so that the plastic frame 31 formed in the injection cavity 50 covers the side of the display substrate 14 and the components below the first composite functional layer 21.

[0130] In the area between the side of the first composite functional layer 21 and the side of the display substrate 14, when the injection mold is in contact with the upper surface of the display module, there is a preset width between the injection cavity 50 and the side of the first composite functional layer 21. To this end, in some optional embodiments, the present application also provides a display module, wherein there is a preset width between the injection cavity 50 and the side of the first composite functional layer 21.

[0131] Specifically, the preset width is the same as the width of the inner groove wall of the injection mold.

[0132] In order to achieve better structural support and bond components such as the display substrate 14 and the protective cover 11, the height of the injection cavity 50 is greater than the thickness of the first composite functional layer 21, so that the plastic frame 31 formed in the injection cavity 50 covers the side of the display substrate 14 and the components below the first composite functional layer 21. The height of the injection cavity 50 is greater than the thickness of the first composite functional layer 21, which means that based on the same layer or the same horizontal plane, the upper surface height of the injection cavity 50 is higher than the upper surface height of the first composite functional layer 21.

[0133] Furthermore, the height of the injection cavity 50 may be greater than the thickness of the display module.

[0134] The display module in the present application can also be simultaneously molded by an injection mold to achieve fixed support for the bending area of ​​the display substrate 14. To this end, in some optional embodiments, the present application also provides a display module, wherein:

[0135] The display substrate 14 includes a display area and a non-display area surrounding the display area.

[0136] The display substrate 14 further includes a bending region in the non-display region. The display substrate 14 is bent in the bending region so that one end of the display substrate 14 is bent to the surface of the first composite functional layer away from the display substrate.

[0137] One end of the display substrate 14 may be bent to the upper surface of the first composite functional layer.

[0138] The display substrate 14 is bent in the bending area to form a display substrate channel, and the display substrate channel is communicated with the injection cavity 50 .

[0139] Since the display substrate channel is connected to the injection cavity 50 , when the plastic fluid 30 is injected into the injection cavity 50 , the plastic fluid 30 will also enter the display substrate channel and support and fix the bending area of ​​the display substrate 14 after solidification, thereby enhancing the structural strength of the display substrate 14 .

[0140] In order to make the plastic fluid 30 enter the display substrate channel better, in some optional embodiments, the present application also provides a display module, wherein:

[0141] The glue outlet 42 located in the bending area and the glue inlet 41 opposite to the glue outlet 42 are located at the opposite end of the display module.

[0142] The plastic inlet 41 is used to allow the plastic fluid 30 to enter the injection cavity 50 and the display substrate channel connected to the injection cavity 50 , and to flow out through the plastic outlet 42 , so that the plastic fluid 30 fills the injection cavity 50 and the display substrate channel connected to the injection cavity 50 .

[0143] Specifically, the two ends of the display substrate channel may be located at two sides directly below the glue outlet 42 , respectively.

[0144] In the embodiment of the present application, since the glue outlet 42 is on the opposite side of the glue inlet 41 and the display substrate channel is located at the glue outlet 42, both ends of the display substrate channel are also facing the flow direction of the plastic fluid 30, so that the plastic fluid 30 can enter the display substrate channel more smoothly.

[0145] like Figure 3 or Figure 4 As shown, in order to further optimize the function and structure of the display module, in some optional implementations, the present application also provides a display module, further comprising:

[0146] The polarizing layer 13 is located on the side of the display substrate 14 close to the protective cover plate 11 , the optical adhesive 12 is located between the protective cover plate 11 and the polarizing layer 13 , and the flexible circuit substrate 17 is located on the side of the first composite functional layer 21 away from the protective cover plate 11 .

[0147] The optical adhesive 12 may be a heat-curing optically transparent hot melt adhesive.

[0148] The flexible circuit substrate 17 may be electrically connected to one end of the display substrate 14 located above the first composite functional layer 21 , so as to realize the display function of the display module.

[0149] Reference Figure 6 , Figure 6 FIG. 1 is a schematic cross-sectional view of a display device in an embodiment of the present application. Figure 7 , Figure 7 FIG. 2 shows a cross-sectional structural diagram of another display device in an embodiment provided by the present application. Figure 6 or Figure 7 As shown, based on the same inventive concept, the present application also provides a display device, including: a display module as described in any one of the above embodiments.

[0150] The display device further includes: a plastic frame 31 surrounding and bonding the display module and a middle frame surrounding and bonding the plastic frame 31 .

[0151] The middle frame may be made of an organic polymer material or a metal material, for example, an aluminum alloy material or a stainless steel material.

[0152] The plastic frame 31 is obtained by injecting the plastic fluid 30 into the injection cavity 50 and solidifying the plastic fluid 30 after filling the injection cavity 50 . The outer surface of the plastic frame 31 is the same as the inner surface of the injection cavity 50 .

[0153] like Figure 6 As shown, in some optional embodiments, corresponding to the display module in the above embodiment, when the display module includes the second composite functional layer 22, due to the gap between the injection mold and the upper surface of the second composite functional layer 22, the injection cavity 50 extends to contact the side of the first composite functional layer 21. Since the plastic frame 31 is formed in the plastic cavity, the plastic frame 31 also extends to contact the side of the first composite functional layer 21. In addition, since the sidewall width of the injection mold is less than the distance between the side of the first composite functional layer 21 and the side of the second composite functional layer 22, the thickness of the plastic frame 31 on the display substrate 14 is also different: the thickness of the plastic frame 31 within the preset width from the first composite functional layer 21 is less than the thickness of the first composite functional layer 21. In addition, outside the preset width from the first composite functional layer 21, the thickness of the plastic frame 31 is greater than the thickness of the first composite functional layer 21.

[0154] like Figure 7 As shown, in some other optional embodiments, corresponding to the display module in the above embodiment, when the display module includes a support member 23, due to the gap between the injection mold and the upper surface of the support member 23, the injection cavity 50 extends to contact the side of the first composite functional layer 21. Since the plastic frame 31 is formed in the plastic cavity, the plastic frame 31 also extends to contact the side of the first composite functional layer 21. In addition, since the sidewall width of the injection mold is less than the distance between the side of the first composite functional layer 21 and the side of the second composite functional layer 22, the thickness of the plastic frame 31 on the display substrate 14 is also different: the thickness of the plastic frame 31 within the preset width from the first composite functional layer 21 is less than the thickness of the first composite functional layer 21. In addition, outside the preset width from the first composite functional layer 21, the thickness of the plastic frame 31 is greater than the thickness of the first composite functional layer 21.

[0155] In some other optional embodiments, corresponding to the display module in the above embodiment, when the display module includes a support member 23, since the support member 23 enhances the structural strength of the side of the display module, the injection mold can contact the upper surface of the support member 23, and there is a gap between the injection cavity 50 and the side of the first composite functional layer 21. Since the plastic frame 31 is formed in the plastic cavity, there is also a gap between the plastic frame 31 and the side of the first composite functional layer 21. Therefore, the thickness of the plastic frame 31 is greater than the thickness of the first composite functional layer 21 beyond the preset width from the first composite functional layer 21.

[0156] The preset width is the width of the side wall of the injection mold.

[0157] Reference Figure 8 , Figure 8 FIG. 1 is a schematic cross-sectional structure diagram of a display module for injection molding in an embodiment provided by the present application. Figure 8 As shown, based on the same inventive concept, the present application also provides an injection mold, including an upper mold core 51 and a lower mold core 52 .

[0158] The present application can use the mold frame to support the mold core. Specifically, the injection mold can also include an upper mold frame 53 and a lower mold frame 54 that are respectively connected or covered with the upper mold core 51 and the lower mold core 52. Among them, the upper mold frame 53 and the lower mold frame 54 can enclose and cover the upper mold core 51 and the lower mold core 52.

[0159] Specifically, the injection cavity 50 may be connected to the glue inlet 41 and the glue outlet 42 to enable the plastic fluid 30 to fill the injection cavity 50. The glue inlet 41 and / or the glue outlet 42 may pass through the upper mold core 51 and the upper mold frame 53.

[0160] Exemplarily, in order to perform injection molding on a circular display module such as that used in a smart watch, the upper mold core 51 may be an annular shell having a downward annular opening thereon to form an annular groove, the inner surface of the annular groove coinciding with the inner surface of the injection molding cavity 50 .

[0161] The upper mold core 51 and the lower mold core 52 are used to enclose the display module as in any of the above embodiments to form an injection cavity 50 surrounding the side of the display module.

[0162] The injection mold may be an annular shell, and the inner side surface of the annular inner side wall may be used to fix and connect the side surface of the first composite functional layer 21 to form a closed injection cavity 50 .

[0163] Reference Fig. 9 , Fig. 9 FIG. 1 is a schematic diagram of a partial cross-sectional structure of another display module for injection molding in an embodiment provided by the present application. Fig. 9 shown Figure 8 In some optional embodiments, corresponding to the display module in the above embodiment, when the display module includes a support member 23, there is a gap between the injection mold and the upper surface of the support member 23, and the injection cavity 50 extends to contact the side of the first composite functional layer 21. The plastic fluid 30 fills the injection cavity 50 and also extends to contact the side of the first composite functional layer 21.

[0164] Reference Fig.10 , Fig.10 FIG. 1 is a schematic diagram of a partial cross-sectional structure of another display module for injection molding in an embodiment provided by the present application. Fig.10 As shown, in some other optional embodiments, corresponding to the display module in the above embodiment, when the display module includes the second composite functional layer 22, due to the gap between the injection mold and the upper surface of the second composite functional layer 22, the injection cavity 50 extends to contact the side surface of the first composite functional layer 21. The plastic fluid 30 fills the injection cavity 50 and also extends to contact the side surface of the first composite functional layer 21.

[0165] Reference Fig.11 , Fig.11 FIG. 1 is a schematic diagram of a partial cross-sectional structure of another display module for injection molding in an embodiment provided by the present application. Fig.11 As shown, in some other optional embodiments, corresponding to the display module in the above-mentioned embodiment, since the support member 23 enhances the structural strength of the side of the display module, the injection mold can contact the upper surface of the support member 23, and there is a gap between the injection cavity 50 and the side of the first composite functional layer 21. The plastic fluid 30 fills the injection cavity 50, and there is a gap between the side of the first composite functional layer 21.

[0166] In some optional embodiments, any one of the injection cavity 50, the injection fluid or the plastic frame 31 can contact or bond with the side of the display module below the first composite functional layer 21 in the display module and above the protective cover plate 11 to form structural protection.

[0167] Reference Fig.12 , Fig.12 A flowchart of a method for manufacturing a display device in an embodiment of the present application is shown. Fig.12 As shown, based on the same inventive concept, the present application also provides a method for manufacturing a display device, comprising:

[0168] Step S601: providing a display module according to any of the above embodiments.

[0169] Step S602 , providing an injection mold, so that the injection mold encloses the display module to form an injection cavity 50 surrounding the side of the display module. The side of the first composite functional layer 21 of the display module is fixedly connected to the injection mold to form a closed injection cavity 50 .

[0170] Step S603 , injecting plastic fluid 30 into the injection cavity 50 in a vacuum environment.

[0171] Step S604 , after the plastic fluid 30 fills the injection cavity 50 , the plastic fluid 30 is solidified to obtain a molded plastic.

[0172] Step S605 , removing the excess plastic of the molded plastic at the plastic inlet 41 and the plastic outlet 42 , and removing the injection mold to obtain the plastic frame 31 .

[0173] Step S606 , providing a middle frame so that the middle frame surrounds and bonds the plastic frame 31 .

[0174] Reference Fig.13 , Fig.13 FIG. 1 is a flowchart showing a method for making a plastic frame 31 in an embodiment of the present application. Fig.13 As shown, the embodiment of the present application further provides a method for manufacturing a plastic frame 31, comprising:

[0175] Step S600, cleaning the side of the display module.

[0176] Step S602 , providing an injection mold, so that the injection mold encloses the display module to form an injection cavity 50 surrounding the side of the display module.

[0177] Step S603 , injecting plastic fluid 30 into the injection cavity 50 in a vacuum environment.

[0178] Step S604 , after the plastic fluid 30 fills the injection cavity 50 , the plastic fluid 30 is cured at high temperature to obtain a molded plastic.

[0179] Step S607 , removing excess plastic from the molding plastic at the plastic inlet 41 and the plastic outlet 42 .

[0180] Step S608 , removing the injection mold to obtain the plastic frame 31 .

[0181] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0182] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0183] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0184] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0185] In this application, the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or terminal device including the element.

[0186] Finally, it should be noted that specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the technical solution and its core ideas of the present application. Although the preferred embodiments of the present application have been described, once the technical personnel in the field know the basic creative concepts, they can make additional changes and modifications to these embodiments. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

Claims

1. A display module, characterized in that: The side of the display module is injection molded by an injection mold, and the display module comprises: a protective cover plate, a display substrate and a first composite functional layer stacked in sequence; The side surface of the first composite functional layer is retracted relative to the side surface of the display substrate, and the side surface of the first composite functional layer can be fixedly connected to the first side surface of the injection mold to form a closed injection cavity, and the inner surface of the injection cavity at least includes the upper surface of the display module between the side surface of the first composite functional layer and the side surface of the display substrate.

2. The display module according to claim 1, characterized in that: The side surface of the display substrate is retracted relative to the side surface of the protective cover plate, so that when the injection mold surrounds the side surface of the first composite functional layer and the display substrate, the side surface of the protective cover plate can be fixedly connected to the second side surface of the injection mold to form the closed injection cavity; Wherein, the inner surface of the injection cavity at least includes: the upper surface of the protection cover plate between the side surface of the display substrate and the side surface of the protection cover plate, and the side surface of the display substrate.

3. The display module according to claim 1, characterized in that: Also includes: a second composite functional layer located between the first composite functional layer and the display substrate; The side surface of the second composite functional layer and the side surface of the display substrate are in the same plane, so that the side surface of the first composite functional layer is retracted relative to the side surface of the second composite functional layer.

4. The display module according to claim 3, characterized in that: The material of the first composite functional layer and / or the second composite functional layer includes copper or aluminum.

5. The display module according to claim 3, characterized in that: The thickness of the first composite functional layer and / or the second composite functional layer is any value between 0.02 mm and 0.05 mm; And / or, the distance between the side surface of the first composite functional layer and the side surface of the second composite functional layer is any value between 0.3 mm and 0.5 mm.

6. The display module according to claim 1, characterized in that: Also includes: A support member located on one side of the display substrate and surrounding the first composite functional layer; Wherein, the thickness of the first composite functional layer is greater than the thickness of the support member, so that there is a height difference greater than a preset value between the first composite functional layer and the support member.

7. The display module according to claim 6, characterized in that: The material of the support member includes stainless steel.

8. The display module according to claim 6, characterized in that: The thickness of the first composite functional layer is any value between 0.05 mm and 0.075 mm; And / or, the thickness of the support member is 0.02 mm; And / or, the width of the support member along the side surface of the first composite functional layer toward the side surface of the display substrate is 0.4 mm; And / or, a distance between a side surface of the first composite functional layer and a side surface of the display substrate is any value between 0.5 mm and 1 mm.

9. The display module according to claim 1, characterized in that: The injection molding cavity is in contact with a side surface of the first composite functional layer; Wherein, the height of the injection cavity within a preset width from the side of the first composite functional layer is smaller than the thickness of the first composite functional layer.

10. The display module according to claim 1, characterized in that: There is a preset width between the injection cavity and the side surface of the first composite functional layer; The height of the injection cavity is greater than the thickness of the first composite functional layer.

11. The display module according to any one of claims 1 to 10, characterized in that: The display substrate comprises: a display area and a non-display area surrounding the display area; The display substrate further comprises a bending region in the non-display region; the display substrate is bent in the bending region so that one end of the display substrate is bent to a surface of the first composite functional layer away from the display substrate; Wherein, the display substrate is bent in the bending area to form a display substrate channel, and the display substrate channel is communicated with the injection cavity.

12. The display module according to claim 11, characterized in that: The injection cavity comprises: a glue outlet located in the bending zone and a glue inlet located at the opposite end of the display module relative to the glue outlet; The plastic inlet is used to allow the plastic fluid to enter the injection cavity and the display substrate channel connected to the injection cavity, and flow out through the plastic outlet, so that the plastic fluid fills the injection cavity and the display substrate channel connected to the injection cavity.

13. A display device, characterized in that: include: The display module according to any one of claims 1 to 12; The display device further comprises: a plastic frame surrounding and bonding the side surface of the display module and a middle frame surrounding and bonding the plastic frame; The plastic frame is obtained by injecting plastic fluid into an injection cavity and solidifying the plastic fluid after filling the injection cavity. The outer surface of the plastic frame is the same surface as the inner surface of the injection cavity.

14. An injection mold, characterized in that: The injection mold comprises an upper mold core and a lower mold core; The upper mold core and the lower mold core are used to enclose the display module according to any one of claims 1 to 12 to form an injection molding cavity surrounding the side of the display module; The first side surface of the injection mold is used to fix and connect the side surface of the first composite functional layer to form the closed injection cavity.

15. A method for manufacturing a display device, characterized in that: include: Providing a display module according to any one of claims 1 to 12; Providing an injection mold so that the injection mold encloses the display module to form an injection cavity surrounding the side of the display module; wherein the side of the first composite functional layer of the display module is fixedly connected to the first side of the injection mold to form the closed injection cavity; Injecting plastic fluid into the injection cavity in a vacuum environment; After the plastic fluid fills the injection cavity, solidifying the plastic fluid to obtain molded plastic; Cleaning the excess plastic of the molded plastic at the plastic inlet and plastic outlet, and removing the injection mold to obtain a plastic frame; A middle frame is provided, and the middle frame surrounds and is bonded to the plastic frame.

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