Display module, preparation method thereof and display device

Abstract

The invention provides a display module, a preparation method thereof and a display device, and aims to solve the problem that fragments of a cover plate are splashed due to impact of external force when the display module falls off. The display module comprises a display screen body, a protective film layer and a cover plate. The cover plate is arranged on the light-emitting side of the display screen body and provided with a display area and a non-display area formed on the periphery of the display area, and a groove is formed in the surface, close to the light-emitting side of the display screen body, of the cover plate. The protective film layer is arranged on the side, close to the display screen body, of the cover plate, and the protective film layer is arranged in the groove. According to the display module, the protective film layer is arranged in the groove of the cover plate, so that the overall structural strength and impact resistance of the display module are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display module and its manufacturing method, and a display device. Background Technology

[0002] With the rapid development of display technology, display devices such as mobile phones, tablets, and smart wearable devices are increasingly widely used in daily life. As the core component of a display device, the display module typically includes a display screen and a cover plate covering its light-emitting side.

[0003] In existing technologies, a protective film layer is often applied to the surface of the cover plate to improve its scratch resistance or impact resistance. However, the application of this protective film layer often leads to an increase in the overall thickness of the display module, or causes problems such as air bubbles and foreign objects during the bonding process between the cover plate and the display body, affecting the display effect and product reliability. In addition, warping or dust accumulation is prone to occur at the edges of the protective film layer, further reducing the appearance quality and lifespan of the display module. Summary of the Invention

[0004] In view of this, embodiments of this application provide a display module and its manufacturing method, as well as a display device, aimed at improving the impact resistance of the display module.

[0005] One embodiment of this application provides a display module, which includes: a display screen body; a cover plate disposed on the light-emitting side of the display screen body, the cover plate having a display area and a non-display area formed around the display area, and a groove provided on the surface of the cover plate near the display screen body; and a protective film layer disposed on the side of the cover plate near the display screen body, and the protective film layer being disposed in the groove.

[0006] According to an embodiment of the first aspect of this application, the protective film layer includes an adhesive layer and a substrate layer. The adhesive layer is disposed on the side of the cover plate close to the display screen body, and the substrate layer is disposed on the side of the adhesive layer away from the cover plate.

[0007] According to any of the foregoing embodiments of the first aspect of this application, the material of the substrate layer includes at least one of polyethylene terephthalate and polyimide;

[0008] According to any of the foregoing embodiments of the first aspect of this application, the material of the adhesive layer includes at least one of acrylic adhesive, silicone adhesive, and polyurethane adhesive.

[0009] According to any of the foregoing embodiments of the first aspect of this application, the material of the substrate layer further includes a heat dissipation material, and / or the material of the substrate layer further includes an antistatic material.

[0010] According to any of the foregoing embodiments of the first aspect of this application, the heat dissipation material includes at least one of aluminum nitride, boron nitride, and aluminum oxide;

[0011] According to any of the foregoing embodiments of the first aspect of this application, the antistatic material includes at least one of silver nanowires, nickel nanoparticles, and stainless steel fibers.

[0012] According to any of the foregoing embodiments of the first aspect of this application, the dimension of the protective film layer in the direction perpendicular to the display body is less than or equal to the dimension of the groove in the direction perpendicular to the display body.

[0013] According to any of the foregoing embodiments of the first aspect of this application, the protective film layer has a dimension of 0.01-0.05 mm in the direction perpendicular to the display screen body.

[0014] According to any of the foregoing embodiments of the first aspect of this application, the shortest distance between the sidewall of the groove and the edge of the cover plate in the first direction is 0.7-1.5mm, and the shortest distance between the sidewall of the groove and the edge of the cover plate in the second direction is also 0.7-1.5mm; the size of the groove in the direction perpendicular to the display screen body is 0.01-0.15mm; and the first direction intersects with the second direction.

[0015] According to any of the foregoing embodiments of the first aspect of this application, the groove includes a second groove portion disposed in the display area and a first groove portion surrounding the second groove portion, the first groove portion communicating with the second groove portion; and in the direction perpendicular to the display body, the size of the second groove portion is larger than the size of the first groove portion.

[0016] According to an embodiment of the first aspect of this application, the display module further includes a sealant layer disposed in the annular gap between the sidewall of the protective film layer and the sidewall of the groove, wherein the sealant layer bonds the sidewall of the protective film layer to the sidewall of the groove.

[0017] According to any of the foregoing embodiments of the first aspect of this application, the display module further includes: an optical adhesive layer disposed on the side of the protective film layer away from the cover plate; an ink layer disposed on the side of the protective film layer away from the cover plate, wherein the side of the ink layer away from the display body and the side of the cover plate close to the display body are on the same plane; the ink layer has an opening forming a display area, wherein in a direction perpendicular to the display body, the orthographic projection of the ink layer coincides with the orthographic projection of the non-display area, the orthographic projection of the optical adhesive layer at least partially overlaps with the orthographic projection of the ink layer, and the optical adhesive layer covers at least a portion of the side surface of the ink layer; an adhesive layer disposed in the non-display area and located on the side of the ink layer away from the cover plate; and a middle frame including a side wall portion and an adhesive portion, wherein the side wall portion extends in a direction perpendicular to the display body, the adhesive portion extends in a direction from the side wall portion toward the display body, and the side wall portion is connected to the adhesive portion, and the adhesive portion is attached to the adhesive layer.

[0018] The second aspect of this application also provides a method for manufacturing a display module, including:

[0019] Provide a cover plate, and prepare grooves on the cover plate;

[0020] A protective film layer is placed inside the groove;

[0021] The protective film layer is processed on the surface away from the cover plate to make the outer surface of the protective film layer flush with the outer surface of the cover plate, so as to form a continuous plane.

[0022] An ink layer is formed in the non-visible area of ​​a continuous plane;

[0023] The cover plate, which has an ink layer and a protective film layer, is bonded to the display screen using optical adhesive.

[0024] An adhesive layer is applied to the side of the ink layer away from the cover plate;

[0025] The adhesive layer is applied to the bonding portion of the middle frame to obtain the display module.

[0026] The third aspect of this application also provides a display device, including the display module provided in any of the first aspect embodiments above, or including a display module obtained by the preparation method provided in any of the second aspect embodiments above.

[0027] In the display module provided in this application embodiment, the display module includes a display screen body, a protective film layer, and a cover plate. The cover plate is disposed on the light-emitting side of the display screen body, and the cover plate has a display area and a non-display area formed around the display area. A groove is provided on the surface of the cover plate near the light-emitting side of the display screen body. The protective film layer is disposed in the groove on the side of the cover plate near the display screen body, so that the outer surface of the protective film layer and the inner surface of the cover plate form a continuous plane. This structural design effectively avoids the problem of increased module thickness and structural unevenness caused by the protective film layer protruding separately. By placing the protective film layer inside the cover plate, the overall structural strength and impact resistance of the display module can be significantly improved, while ensuring the uniformity of the optical adhesive during the bonding process, thereby improving the bonding yield between the display screen body and the cover plate and the overall assembly reliability of the display module. Attached Figure Description

[0028] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, wherein the same or similar reference numerals denote the same or similar features.

[0029] Figure 1 This is a schematic diagram of the overall structure of a display device in related technologies;

[0030] Figure 2 This is a schematic diagram of the structure of a display module provided in an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the structure of a protective film layer for a display module provided in an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the structure of a protective film layer for a display module according to another embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the structure of a cover plate for a display module provided in an embodiment of this application;

[0034] Figure 6 This is a schematic diagram of the structure of a display module provided in another embodiment of this application;

[0035] Figure 7 This is a schematic diagram of the structure of a protective film layer for a display module according to another embodiment of this application;

[0036] Figure 8 This is a schematic diagram of the structure of a display module provided in another embodiment of this application;

[0037] Figure 9 This is a schematic diagram of a method for manufacturing a display module provided in an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 01. Display device;

[0040] 10. Display panel body; 11. Polarizing film; 12. Optical adhesive layer; 13. Protective film layer; 131. Adhesive layer; 132. Substrate layer; 14. Cover plate; 141. First recessed portion; 142. Second recessed portion; 15. Ink layer; 16. Adhesive layer; 17. Sealing adhesive layer

[0041] 20. Middle frame; 21. Side wall; 22. Fitting part;

[0042] A. Display area; B. Non-display area;

[0043] X, the first direction; Y, the second direction. Detailed Implementation

[0044] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] Figure 1 This is a schematic diagram of the overall structure of a display device in related technologies. Figure 2 This is a schematic diagram of the structure of a display module provided in an embodiment of this application;

[0048] like Figure 1 and Figure 2As shown, the display device 01 mainly includes a display screen body 10 and a middle frame 20. The display screen body 10 is located on one side of the middle frame 20. The middle frame 20 is usually made of metal and provides the main mechanical strength for the entire display device, preventing the display device from bending under stress and protecting its internal precision display components and other electronic components. One embodiment of this application provides a display module, which mainly includes a display screen body 10, a cover plate 14, and a protective film layer 13. The display screen body 10 is used to realize the image display function of the display module. The cover plate 14 is disposed on the light-emitting side of the display screen body 10, and the cover plate 14 has a display area A and a non-display area B formed around the display area A. The protective film layer 13 is disposed in a groove on the side of the cover plate 14 near the display screen body 10.

[0049] The display panel 10 is used to realize the image display function of the display module. Its type can be a liquid crystal display panel (LCD), an organic light-emitting diode display panel (OLED), or a micro-light-emitting diode display panel (Micro-LED), etc. In this embodiment, an OLED display panel is used as an example for explanation.

[0050] like Figure 2 As shown, the display module also includes: a polarizer 11, disposed on the light-emitting side of the display body 10, used to improve display contrast; and a cover plate 14, disposed on the light-emitting side of the display body 10, specifically bonded to the polarizer 11 via an optical adhesive layer 12. The cover plate 14 is used to protect the display body 10 from external impacts and scratches. The cover plate 14 has a display area A and a non-display area B. The display area A corresponds to the effective display area of ​​the display body 10, through which light can pass without obstruction; the non-display area B is usually shielded by printing ink or other means to hide the wiring, circuits, and other non-display structures underneath. The material of the cover plate 14 can be chemically strengthened glass, ultra-thin glass (UTG), or transparent polymer materials, etc.

[0051] In this embodiment, a groove is provided on the surface of the cover plate 14 near the display screen body 10, and the protective film layer 13 is disposed in the groove of the cover plate 14. By disposing the protective film layer 13 in the groove of the cover plate 14, the side of the protective film layer 13 away from the cover plate is basically flush with or slightly lower than the surface of the cover plate 14 around the groove. This structural design not only significantly improves the overall structural strength and impact resistance of the display module, but also reduces the increase in the overall thickness of the module caused by adding the protective film layer 13, meeting the current pursuit of thinness and lightness in electronic products. Secondly, this structure avoids the formation of steps due to protrusions at the edges of the protective film layer 13. The flat base of this structure makes the subsequent coating or bonding process of the optical adhesive layer 12 smoother, greatly reducing the risk of bubbles and poor bonding caused by uneven flow of optical adhesive or poor bonding of the optical adhesive layer 12 at the steps, thereby significantly improving the assembly yield of the display module. Finally, the protective film layer 13 is placed inside the groove of the cover plate 14, so that the protective film layer 13 is physically constrained by the side wall of the groove, making the position of the protective film layer 13 more stable and less likely to shift or warp at the edges due to factors such as vibration or temperature difference during module processing, transportation or user use.

[0052] Figure 3 This is a schematic diagram of the structure of a protective film layer for a display module provided in an embodiment of this application. (Refer to...) Figure 3 The protective film layer 13 of a display module provided in this application embodiment adopts a composite layered structure, specifically including an adhesive layer 131 and a substrate layer 132. The adhesive layer 131 is directly disposed inside the groove of the cover plate 14 to firmly bond the protective film layer 13 to the cover plate 14. The substrate layer 132 is stacked on the side of the adhesive layer 131 away from the cover plate 14 and is the main functional carrier of the protective film layer 13.

[0053] Optionally, the substrate layer material includes polyethylene terephthalate (PET) or polyimide (PI), or a composite material of both. PET material has a number of outstanding advantages: firstly, it has high mechanical strength, rigidity, and hardness, effectively resisting scratches and minor impacts; secondly, it has excellent transparency, with minimal impact on display effects; and finally, it is relatively inexpensive, facilitating large-scale commercial applications. PI material, on the other hand, possesses high-temperature resistance (its glass transition temperature and thermal decomposition temperature are much higher than PET), chemical corrosion resistance, and high mechanical strength, making it suitable for applications with more stringent operating temperature requirements (such as automotive displays and high-temperature industrial environments) or those requiring higher dimensional stability.

[0054] The adhesive layer 131 not only needs to ensure the initial adhesion between the protective film layer 13 and the bottom surface of the groove of the cover plate 14, but also needs to maintain the adhesion stability during long-term use, and can absorb some energy through its own micro-deformation when subjected to accidental impact, thus playing a buffering role.

[0055] Optionally, the adhesive layer material includes at least one of acrylic adhesive, silicone adhesive, or polyurethane adhesive. Acrylic adhesive is one of the most commonly used choices due to its high cohesive strength, high transparency, and moderate cost. Silicone adhesive has excellent high and low temperature resistance (operating temperature range typically from -60°C to above 200°C), excellent chemical inertness (not easily reacting with other materials), and compressibility, making it suitable for display modules that may experience large temperature fluctuations (such as from extremely cold outdoor environments to warm indoor environments, or prolonged operation and heat generation), and it can better absorb thermal stress. Polyurethane adhesive has better abrasion resistance and impact resistance, providing better cushioning protection. The most suitable adhesive material can be selected based on the specific application scenario, reliability requirements, and cost considerations of the display module.

[0056] Figure 4 This is a schematic diagram of the structure of a protective film layer for a display module according to another embodiment of this application. Figure 4 As shown, the substrate layer 132 is composed of materials other than PET or PI, including heat dissipation materials and / or antistatic materials. By adding high thermal conductivity insulating fillers such as aluminum nitride (AlN) and boron nitride (BN), the substrate layer 132 can rapidly diffuse the heat generated by the display body 10 during operation, effectively reducing the local temperature of the display core area, thereby preventing display performance degradation and extending device life. By adding conductive fillers such as silver nanowires and nickel nanoparticles, a dissipation path is provided for the static charge accumulated in the display module, preventing electrostatic interference with the display or circuit breakdown, and improving reliability.

[0057] Figure 5 This is a schematic diagram of the structure of a cover plate for a display module provided in an embodiment of this application, as shown below. Figure 5 As shown, the shortest distance w between the sidewall of the groove and the edge of the cover plate in the first direction is 0.7-1.5mm, and the shortest distance between the sidewall of the groove and the edge of the cover plate in the second direction is also 0.7-1.5mm, and the first and second directions intersect. If the shortest distance between the sidewall of the groove and the edge of the cover plate 14 is less than 0.7mm, edge chipping or cracking is likely to occur during subsequent processing such as cutting and grinding of the cover plate 14, or when the end product is subjected to impacts such as bumps or drops, affecting product yield and reliability. Conversely, if the distance is greater than 1.5mm, it will excessively encroach on the available width of the non-display area B, failing to meet the current market demand for narrow bezel visual effects. Therefore, controlling the shortest distance between the sidewall of the groove and the edge of the cover plate 14 to be between 0.7mm and 1.5mm can ensure that the edge of the cover plate 14 has sufficient mechanical strength to resist processing and usage stress, while maximizing the compression of the bezel size to meet the narrow bezel requirements of modern electronic products.

[0058] For example, the shortest distance between the groove sidewall and the edge of the cover plate 14 in the display module provided in this application can be 0.7, 0.9, 1.1, 1.3, or 1.5 mm, and this application does not limit it.

[0059] The dimension d of the groove in the direction perpendicular to the display screen body is 0.01-0.15mm. If the depth of the groove is less than 0.01mm, the accommodating space of the groove is very limited, and the protective film layer 13 can hardly be effectively embedded, making it difficult to achieve the expected flatness effect. Moreover, the requirements for equipment precision and process control during processing are extremely high, and the yield rate is difficult to guarantee. Conversely, if the depth is greater than 0.15mm, it will weaken the bending and impact resistance of the cover plate 14, which may make it more prone to breakage during bonding or use.

[0060] For example, the size of the groove in the display module provided in this application in the direction perpendicular to the display body 10 can be 0.05, 0.1, or 0.15 mm, and this application does not limit it.

[0061] Furthermore, the dimension of the protective film layer 13 in the direction perpendicular to the display body 10 is less than or equal to the dimension of the groove in the direction perpendicular to the display body 10. This is a basic premise for achieving a flat structure, ensuring that after the protective film layer 13 is embedded in the groove 121, its outer surface away from the cover plate 14 will not be higher than the inner surface of the surrounding cover plate 14, thereby providing a flat, stepless reference plane for the subsequent bonding of the optical adhesive layer 12.

[0062] Preferably, the size of the protective film layer 13 in the direction perpendicular to the display screen body 10 is further optimized to 0.01 mm to 0.05 mm. For example, the size of the protective film layer 13 in the display module provided in this application in the direction perpendicular to the display screen body 10 can be 0.01, 0.02, 0.03, 0.04, or 0.05 mm, and this application does not limit it.

[0063] Figure 6 This is a schematic diagram of the structure of a display module provided in an embodiment of this application, such as... Figure 6 As shown, the groove includes a second groove portion 142 located in the display area A and a first groove portion 141 surrounding the second groove portion 142. The first groove portion 141 communicates with the second groove portion 142. Furthermore, in the direction perpendicular to the display screen body 10, the size of the second groove portion 142 is larger than the size of the first groove portion 141. The display area A is the core area of ​​the display device 01, requiring higher flatness and protection. A deeper second groove portion 142 can accommodate a thicker protective film layer 13, providing more adequate protection for the display functional area. In contrast, the non-visible area B is typically supported by a structure such as a middle frame 20. A shallower first groove portion 141 is sufficient to meet the protection requirements and also helps maintain the overall strength of the cover plate 14 in the non-display area B.

[0064] In some embodiments, the groove further includes a third groove portion and / or a fourth groove portion and / or a fifth groove portion. Specifically, the groove can be designed according to its overall depth and overall width, and the number of steps in the groove can be 2 to 4 while ensuring the bending and impact resistance of the cover plate 14. This application does not limit this.

[0065] In other embodiments, the cross-sectional shape of the groove can be any of rectangular, arc-shaped, or stepped, and this application does not impose any limitation on it.

[0066] Further, see Figure 7 , Figure 7 This is a schematic diagram of the structure of a protective film layer for a display module according to another embodiment of this application. A protrusion is provided on the surface of the substrate layer 132 opposite to the second groove portion 142. The protruding substrate layer 132 and the adhesive layer 131 located in the display area A are both filled within the deeper first groove portion 141. The protrusion of the substrate layer 132 can be formed by performing a local thickening process (such as printing, coating, or embossing) on ​​the substrate layer 132. This design allows the thickness of the protective film layer 13 to be locally enhanced in the display area A, thereby achieving enhanced protection for the core display area without increasing the overall thickness of the protective film layer 13. The cooperation between the protruding portion of the substrate layer 132 and the second groove portion 142 also allows for more precise positioning when applying the protective film layer 13.

[0067] Figure 8 This is a schematic diagram of the structure of a display module provided in an embodiment of this application. (Refer to...) Figure 8 The area of ​​the protective film layer 13 is smaller than the area of ​​the bottom surface of the groove. An annular gap exists between the sidewall of the protective film layer 13 and the sidewall of the groove. A sealant layer 17 is disposed within this annular gap, which firmly bonds the sidewall of the protective film layer 13 to the sidewall of the groove. The sealant layer 17 has good adhesion and elasticity. Preferably, the material of the sealant layer 17 is at least one of silicone, polyurethane adhesive, and UV-curable adhesive, so that it forms a soft and elastic colloid after curing, effectively filling the gap.

[0068] The sealant layer 17 blocks the path of moisture intrusion into the display module along the sidewall of the protective film layer 13. This effectively prevents moisture from penetrating the display body 10 and precision components such as the drive circuit, improving the long-term reliability and service life of the display module in harsh environments such as high temperature and high humidity. Secondly, the elasticity of the sealant layer 17 allows it to absorb and disperse external impact energy. When the display module is subjected to mechanical stress such as drop or compression, the stress is transmitted to the groove area through the cover plate 14. At this time, the soft sealant layer 17 can undergo elastic deformation, playing a buffering role and preventing excessive stress concentration at the edge of the protective film layer 13. This effectively reduces the risk of the protective film layer 13 delaminating or being damaged due to stress concentration. The sealant layer 17 and the protective film layer 13 work together to form a composite protection system that combines "rigid protection" and "flexible buffering," achieving better overall impact resistance than using the protective film layer 13 alone.

[0069] like Figure 2 and Figure 6 As shown, the display module in this embodiment further includes an adhesive layer 16 and a mid-frame 20. The adhesive layer 16 is disposed in the non-display area B and is located on the side of the ink layer 15 away from the cover plate 14. The adhesive layer 16 typically uses a tape with high adhesive strength and cushioning capacity, such as foam tape with release paper or other pressure-sensitive tapes with similar functions. Its function is not only to bond, but also to absorb some impact energy and compensate for dimensional tolerances between different components. The mid-frame 20 is the core structural component of the display device 01, and is usually made of metal (such as aluminum alloy or magnesium alloy) through die casting or CNC process, or injection molded from high-strength engineering plastic. The mid-frame 20 includes a side wall portion 21 and an adhesive portion 22. The side wall portion 21 typically extends vertically or at a certain angle upward from the periphery of the display area A, and is used to provide lateral support, enclosure and positioning for the display module. The bonding portion 22 is connected to the side wall portion 21 and is typically a flat surface that extends horizontally or in a stepped manner from the top of the side wall portion 21. The bonding portion 22 is attached and fixed to the position corresponding to the non-viewable area B of the cover plate 14 by the adhesive layer 16, thereby securely mounting the entire display module (including the display body 10, optical adhesive layer 12, cover plate 14 assembly, etc.) onto the middle frame 20.

[0070] An embodiment of this application provides a display module that further includes: an optical adhesive layer 12 disposed on the side of the protective film layer 13 away from the cover plate 14; an ink layer 15 disposed on the side of the protective film layer 13 away from the cover plate 14, wherein the side of the ink layer 13 away from the display screen body 10 and the side of the cover plate 14 close to the display screen body 10 are on the same plane; the ink layer 15 has an opening forming a display area A, and in a direction perpendicular to the display screen body 10, the orthographic projection of the ink layer 15 coincides with the orthographic projection of the non-display area B; in a direction perpendicular to the display screen body 10, the orthographic projection of the optical adhesive layer 12 at least partially overlaps with the orthographic projection of the ink layer 15, and the optical adhesive layer 12 covers at least a portion of the side surface of the ink layer 15.

[0071] A second aspect of this application provides a method for manufacturing a display module, referring to... Figure 9 The diagram shows a process flow chart for manufacturing a display module. The manufacturing process for the display module includes the following steps.

[0072] S01: Provide a cover plate 14, and prepare a groove on the cover plate 14.

[0073] First, a cover plate 14 substrate that meets the requirements for size, material (such as high-aluminosilicate chemically strengthened glass), thickness, and surface quality is provided. Then, a groove with a specific shape, size, and depth is formed at a predetermined position on the inner surface of the cover plate 14 near the display body 10 using a high-precision machining process.

[0074] In some embodiments, the grooves can be prepared by chemical etching: a mask is used to protect the non-grooved areas, and the exposed areas are selectively etched by an acidic or alkaline chemical etching solution. This preparation method is suitable for processing complex groove patterns and has high dimensional accuracy.

[0075] In other embodiments, the groove can be prepared by laser engraving: the material of the cover plate 14 is ablated and removed using a laser beam of a specific wavelength. This process has high processing precision, up to the micrometer level, and can be performed on a variety of materials, making it highly applicable.

[0076] In some other embodiments, the grooves can also be prepared by CNC precision carving: mechanical grinding is performed using a micro diamond grinding head. This process has high precision in controlling the shape of the grooves, but it has certain requirements on tool wear and the strength of the substrate of the cover plate 14.

[0077] S02: A protective film layer 13 is provided in the groove.

[0078] The pre-prepared protective film layer 13 is precisely positioned and pressed into the groove using an attachment device, and the adhesive layer 131 of the protective film layer 13 is attached to the bottom surface of the groove.

[0079] S03: Process the surface of the protective film layer 13 away from the cover plate 14 to make the outer surface of the protective film layer 13 flush with the outer surface of the cover plate 14, forming a continuous plane.

[0080] If the outer surface of the protective film layer 13 is slightly higher than the inner surface of the cover plate 14 after it is attached, the outer surface of the protective film layer 13 can be processed by grinding or polishing until it is at the same level as the inner surface of the cover plate 14, forming a smooth continuous plane.

[0081] S04: An ink layer 15 is formed in the non-display area B of a continuous plane.

[0082] Ink is applied to the non-display area B of the continuous plane formed above through processes such as screen printing or inkjet printing, and then cured to form an ink layer 15, with the upper surface of the ink layer 15 being flush with the inner surface of the cover plate 14.

[0083] S05: The optical adhesive layer 12 is applied to attach the cover plate 14, which has an ink layer 15 and a protective film layer 13, to the display screen body 10.

[0084] In some embodiments, a measured amount of liquid optical adhesive is applied to the inner surface of the cover plate 14 assembly. The display body 10 and the cover plate 14 assembly are then aligned in a vacuum environment, followed by pressing to allow the liquid optical adhesive to flow evenly and fill gaps. Finally, it is cured by ultraviolet light or heating to form the optical adhesive layer 12. The vacuum environment helps to eliminate air bubbles.

[0085] In other embodiments, a pre-cut solid optical adhesive film can be attached to the inner surface of the cover plate 14 assembly or the light-emitting surface of the display screen 10. Then, under vacuum or non-vacuum conditions, the cover plate 14 assembly and the display screen 10 are aligned and pressed together by roller pressing or flat plate pressing. OCA itself is adhesive, and after pressing, it forms the optical adhesive layer 12.

[0086] S06: An adhesive layer 16 is provided on the side of the ink layer 15 away from the cover plate 14.

[0087] After the display screen body 10 and the cover plate 14 assembly are bonded together, pre-cut double-sided tape (such as foam tape) or liquid adhesive is applied to the side of the ink layer 15 away from the cover plate 14 (i.e., below the non-display area B) to form the bonding adhesive layer 16. The shape of the bonding adhesive layer 16 usually matches the annular area of ​​the non-display area B.

[0088] S07: Attach the adhesive layer 16 to the bonding portion 22 of the middle frame 20 to obtain the display module.

[0089] Finally, the already bonded display screen body 10, optical adhesive layer 12, and cover plate 14 are precisely aligned and pressed onto the bonding part 22 of the middle frame 20 using the bonding adhesive layer 16 to obtain the display module.

[0090] A third aspect of this application also provides a display device, including the display module in any of the above embodiments, or including a display module obtained by the preparation method in any of the above embodiments. The display device in the embodiments of this invention can display moving images and still images, and can display text or images. The display device can be any electronic product with display functionality, including but not limited to mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, control consoles, and other devices with display functionality.

[0091] This application may be implemented in other specific forms without departing from its spirit and essential characteristics. For example, the algorithm described in a particular embodiment may be modified without departing from the basic spirit of this application. Therefore, the present embodiments are to be regarded as exemplary rather than limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description, and all changes falling within the meaning and scope of the claims and their equivalents are thus included within the scope of this application.

Claims

1. A display module, characterized by The application relates to a display screen body, a cover plate arranged on the light-emitting side of the display screen body, a display area and a non-display area formed on the periphery of the display area, a groove arranged on the surface of the cover plate close to the light-emitting side of the display screen body, and a protective film layer arranged on the side of the cover plate close to the display screen body and arranged in the groove. The protective film layer comprises an adhesive layer arranged on the side of the cover plate close to the display screen body and a substrate layer arranged on the side of the adhesive layer away from the cover plate. Preferably, the material of the substrate layer comprises at least one of polyethylene terephthalate and polyimide. Preferably, the material of the adhesive layer comprises at least one of acrylic glue, silicon glue and polyurethane glue.

2. The display module of claim 1, wherein, The material of the substrate layer further comprises heat-dissipating material. The material of the substrate layer further comprises antistatic material. Preferably, the heat-dissipating material comprises at least one of aluminum nitride, boron nitride and aluminum oxide.

3. The display module of claim 2, wherein, Preferably, the antistatic material comprises at least one of nano-silver wire, nickel nano-particle and stainless steel fiber. The size of the protective film layer in the direction perpendicular to the display screen body is less than or equal to the size of the groove in the direction perpendicular to the display screen body. Preferably, the size of the protective film layer in the direction perpendicular to the display screen body is 0.01-0.05 mm. The shortest distance between the side wall of the groove in the first direction and the edge of the cover plate is 0.7-1.5 mm, the shortest distance between the side wall of the groove in the second direction and the edge of the cover plate is also 0.7-1.5 mm, the size of the groove in the direction perpendicular to the display screen body is 0.01-0.15 mm, and the first direction intersects the second direction.

4. The display module of any one of claims 1 to 3, wherein, The groove comprises a second groove part arranged on the display area and a first groove part surrounding the second groove part, the first groove part communicates with the second groove part, and the size of the second groove part is greater than the size of the first groove part in the direction perpendicular to the display screen body. Further comprising:

5. The display module of claim 1, wherein, A sealing glue layer arranged in the annular gap between the side wall of the protective film layer and the side wall of the groove and bonding the side wall of the protective film layer and the side wall of the groove.

6. The display module of claim 1, wherein, Further comprising:

7. The display module of claim 1, wherein, An optical glue layer arranged on the side of the protective film layer away from the cover plate; An ink layer arranged on the side of the protective film layer away from the cover plate, the side of the ink layer away from the display screen body is in the same plane as the side of the cover plate close to the display screen body, the ink layer is provided with an opening, and the opening forms the display area.

8. The display module of claim 1, wherein, In the direction perpendicular to the display screen body, the orthographic projection of the ink layer coincides with the orthographic projection of the non-display area, the orthographic projection of the optical glue layer at least partially overlaps the orthographic projection of the ink layer, and the optical glue covers at least part of the side surface of the ink layer. A bonding glue layer arranged on the non-display area and located on the side of the ink layer away from the cover plate. ​ ​ ​ The middle frame comprises a side wall part and a fitting part, the side wall part extends along a direction perpendicular to the display screen body, the fitting part extends along a direction pointing to the display screen body from the side wall part, and the side wall part is connected with the fitting part, and the fitting part is attached to the fitting adhesive layer.

9. A method for manufacturing a display module, characterized by, The display module comprises: providing a cover plate, and preparing a groove on the cover plate; arranging a protective film layer in the groove; processing a surface of the protective film layer away from the cover plate so that an outer surface of the protective film layer is flush with an outer surface of the cover plate to form a continuous plane; forming an ink layer on a non-display area of the continuous plane; attaching the cover plate provided with the ink layer and the protective film layer to a display screen body through optical adhesive; arranging a fitting adhesive layer on a side of the ink layer away from the cover plate; attaching the fitting adhesive layer to a fitting part of a middle frame to obtain the display module.

10. A display device, characterized by comprising: The display module comprises any one of claims 1-8, or a display module obtained by the preparation method of claim 9.

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