Display module and electronic device

Abstract

A display module and an electronic device, relating to the technical field of display. The display module comprises a surface layer, a first connecting layer, and a display panel which are stacked; the display module comprises a non-bent part and a bent part, the bent part comprises a first bent part, and the thickness of the first connecting layer in the first bent part gradually decreases. According to the display module provided by the present application, during bending manufacturing of the display module, the first connecting layer extends towards the outer edge under compressive stress, and the thickness of the first connecting layer gradually decreases in a first direction in the first bent part, so that the surface profile of the surface layer can be maintained unchanged while the bending depth of the display panel is reduced, and wrinkles generated on the display panel are reduced; and the display panel and the surface layer are connected by means of the first connecting layer, thereby avoiding uneven stress due to the formation of voids, improving the overall structural stability of the display module.

Description

Display modules and electronic devices

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on December 27, 2023, with application number 202311823620.0, and priority to the Chinese patent application with the invention name “Display module and electronic device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of display technology, and in particular to a display module and an electronic device. Background Art

[0003] In recent years, the technology used to manufacture display panels for electronic devices has advanced rapidly. Bendable, flexible screens are widely used as curved displays in electronic devices. Currently, quad-curved displays, which offer improved full-screen display quality, are widely used. Quad-curved displays have curved edges and corners. During the manufacturing process, particularly at the junctions between adjacent curved surfaces, at the four corners, the materials are prone to compression, generating unrelieved stress, leading to wrinkles and affecting the display's visual quality. Summary of the Invention

[0004] The present application provides a display module and an electronic device that can reduce the generation of wrinkles on the curved portion of a display screen when preparing a curved display screen.

[0005] In a first aspect, the present application provides a display module, which includes a surface layer, a first connecting layer and a display panel that are stacked together. The display module includes a non-bending part and a curved part, and the curved part includes a first curved part, and the thickness of the first connecting layer in the first curved part gradually decreases.

[0006] In the display module provided herein, when the display module is bent, the first connection layer is squeezed and extended toward the outer edge. Within the first bent portion, the thickness of the first connection layer gradually decreases along the first direction. This reduces the bending depth of the display panel while maintaining the surface shape of the surface layer, further reducing wrinkles in the display panel. The first connection layer connects the display panel and the surface layer, preventing the formation of voids that could cause stress imbalance and improving the stability of the overall structure of the display module.

[0007] In one possible implementation, the arc length of the first connection layer in the first curved portion is less than the arc length of the display panel in the first curved portion. Within the first curved portion, the arc length of the first connection layer is less than the arc length of the display panel, and the edge of the first connection layer is located on the first side of the edge of the display panel in the first direction. This alleviates the compressive stress of the first connection layer on the display panel, reduces the amount of the second connection layer between the inner surface layer of the first curved portion and the display panel, and alleviates the compressive stress of the first connection layer on the display panel during bending preparation, thereby reducing wrinkles in the display panel caused by compression.

[0008] In one possible implementation, the ratio of the arc length of the first connection layer in the first curved portion to the arc length of the display panel in the first curved portion is within a range of 80% to 96%. By limiting the ratio of the shortened arc length of the first connection layer to the display panel, the bonding performance of the first connection layer is ensured while reducing the possibility of wrinkles on the display panel due to compression within the first curved portion. This optimizes the curved display effect, better adapts to the display requirements of curved displays, helps improve the quality and performance of the display module, and provides users with a better viewing experience.

[0009] In one possible implementation, the first curved portion includes a corner region of the display module. In a display module having a first curved portion located in a corner region, the first curved portion in the corner region experiences a significant amount of lateral extrusion during fabrication. Providing a gradually decreasing second connecting layer can mitigate wrinkles that occur during fabrication of the curved corner region.

[0010] In a possible implementation, the curved portion further includes a second curved portion, the second curved portion includes a side portion of the display module, and the thickness of the first connection layer in the second curved portion is uniformly distributed.

[0011] During display panel processing, the edges of the first connecting layer and the display panel are flush along the thickness direction. When the first connecting layer, polarizing layer, display panel, and backing film are cut along the cutting line, the excess polarizing layer, display panel, backing film, and first release film can be bonded together through the first connecting layer, facilitating their removal after cutting, thereby improving processing efficiency. Bonding the various layers of material together through the first connecting layer makes it easier to remove waste after cutting, reduces residue during processing, and helps improve processing accuracy and product quality.

[0012] In a possible implementation, an edge of the first connection layer in the second curved portion is flush with an edge of the display panel in the second curved portion, so as to effectively support the surface layer and the polarizing layer in the second curved portion.

[0013] In one possible implementation, the curved portion further includes a second curved portion, the second curved portion encompassing a side portion of the display module, and the thickness of the first connection layer gradually decreases within the second curved portion. Within the second curved portion of the side region, the curvature depth of the display panel can be reduced while maintaining the surface profile of the surface layer, thereby reducing wrinkles on the display panel within the second curved portion.

[0014] In one possible implementation, the arc length of the first connection layer in the second curved portion is less than the arc length of the display panel in the second curved portion. The edge of the first connection layer is located on one side of the edge of the display panel in the first direction, thereby alleviating the compressive stress of the first connection layer on the display panel. This can reduce the amount of the second connection layer between the inner surface layer of the second curved portion and the display panel, relieving the compressive stress of the first connection layer on the display panel during bending, and thus reducing wrinkles in the display panel caused by compression.

[0015] In one possible implementation, the ratio of the arc length of the first connection layer in the second curved portion to the arc length of the display panel in the second curved portion is within a range of 80% to 96%. By limiting the ratio of the shortened arc length of the first connection layer to the display panel, the bonding performance of the first connection layer is ensured while reducing the possibility of wrinkles on the display panel due to compression in the second curved portion. This optimizes the curved display effect, better adapts to the display requirements of curved displays, helps improve the quality and performance of the display module, and provides users with a better viewing experience.

[0016] In one possible implementation, a protrusion is provided on the edge of the first connection layer, and the deformation of the protrusion can be used to limit the display module from wrinkling at the position where the protrusion is located, so that corresponding measures can be taken to eliminate the display problems caused by the wrinkles.

[0017] In one possible implementation, there are at least two protrusions, which are spaced apart along the extension direction of the edge of the first connection layer. The multiple protrusions on the edge of the first connection layer can buffer stress in the stress-concentrated region of the first curved portion of the display module. Deformation of the multiple protrusions can partially release stress, thereby dispersing large wrinkles formed in the stress-concentrated region into multiple small wrinkles, thereby reducing the occurrence of wrinkles in the first curved portion of the display module.

[0018] In one possible implementation, the edge of the protrusion smoothly transitions to the edge of the non-protruding portion of the first connecting layer. During bending, the connection between the protrusion and the first connecting layer forms a curve. This smooth transition avoids sharp turns and enables more uniform deformation distribution between the protrusion and the first connecting layer. Localized stress concentrations are relieved at the highest point of the protrusion, thereby reducing sudden changes in stress concentration.

[0019] In one possible implementation, the edges of the protrusions are polygonal or curved. These smoothly curved edges provide more surface area during bending, effectively distributing pressure. Furthermore, the smooth edges of the protrusions reduce the risk of cracking or damaging other components of the display module.

[0020] The raised edge is polygonal, which can reduce the redundancy of the first connection layer when it is bent from a flat side to form a curved state, so as to minimize the occurrence of wrinkles, reduce the degree of wrinkles, and improve display quality.

[0021] In one possible implementation, the display module further includes at least one of a polarizing layer, a back film, and a support member, and within the curved portion: a hole structure is provided on at least one of the polarizing layer, the support member, and the back film. The hole structure is used to reduce the thickness of the thinning layer along the thickness direction in the area covered by the hole structure. The first thinning structure is utilized to reduce the stress and strain in the stress concentration area where the display panel is prone to wrinkles within the first curved portion. By providing the hole structure, the deformation of the hole structure is utilized to absorb the larger stress and strain generated during the bending of the display module, so that the deformation of the display panel is released through the hole structure, thereby preventing the display module from wrinkling within the first curved portion.

[0022] In a possible implementation, the hole structure includes at least one of a through hole and a blind hole.

[0023] A blind hole is a hole whose depth is less than the thickness of the thinning layer. The depth of the hole is measured along the thickness of the thinning layer. For example, in a thinning layer structure consisting of a support member and a backing film, a hole can be made on the surface of the support member facing away from the backing film, without penetrating the support member, to form a blind hole structure in the thinning layer. A thinning layer with a blind hole structure not only relieves stress generated during extrusion, preventing wrinkles in the first curved portion, but also provides a secure connection to the display module.

[0024] A through hole is a hole that passes through the thinning layer. For example, if the thinning layer includes a polarizing layer, the through hole can pass through the polarizing layer. The through hole can relieve the stress generated during compression, making it easier for the display panel to fit within the first curved portion and reducing wrinkles.

[0025] In one possible implementation, the opening shape of the hole structure includes at least one of a rectangle, a circle, an ellipse, a rounded rectangle, a waist shape, and a wave shape. The hole structure opening can have a variety of shapes and can be designed according to actual needs, so that the stress and strain generated during the bending of the display module can be absorbed by the deformation of the hole structure, thereby preventing wrinkles in the first curved portion of the display module.

[0026] In a second aspect, the present application provides an electronic device comprising any of the display modules described above, and further comprising a housing fixedly connected to the outer edges of the display module. The housing is used to secure and support the display module and prevent external impurities such as moisture and dust from affecting the performance of the display module.

[0027] The electronic device provided in the present application has a display module as described in any one of the above items, and in the first curved portion of the display module of the electronic device, the edge of the first connecting layer is located on the first direction side of the edge of the display panel, the thickness of the first connecting layer gradually decreases along the first direction, and the first connecting layer is respectively bonded and connected to the surface layer and the display panel on both sides along the thickness direction. In the first curved portion, by locating the edge of the first connecting layer on the first direction side of the edge of the display panel, the thickness of the first connecting layer gradually decreases along the first direction, and the first connecting layer is respectively bonded and connected to the surface layer and the display panel on both sides along the thickness direction, the extrusion stress of the first connecting layer on the display panel can be relieved, and wrinkles on the display panel caused by extrusion can be reduced. The electronic device with this display module is less likely to have wrinkles at the corners and has a better display effect.

[0028] In a third aspect, the present application also provides a method for preparing a hole structure in a display module, comprising the following steps: preparing a large display panel; laminating a back film on the large display panel to form a composite large panel, preparing a hole structure on the back film of the composite large panel, and then cutting the composite large panel to form a plurality of composite small panels; or first cutting the large display panel to form a plurality of display panel small panels, preparing a back film small panel, preparing a hole structure on the back film small panel, and then laminating the display panel small panel and the back film small panel. A partial hole opening process is implemented in the screen lamination to form a display panel with a hole structure and a partial display module with a back film.

[0029] In one possible implementation, the step of preparing a hole structure on the back film of the composite large panel includes: preparing a hole structure on the back film of the composite large panel by laser engraving; and / or, the step of preparing a hole structure on the back film small plate includes: preparing a hole structure on the back film small plate by laser engraving or die cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a schematic diagram of an electronic device provided in an embodiment of the present application;

[0031] FIG2 is a front view of an electronic device provided in an embodiment of the present application;

[0032] FIG3 is a schematic diagram of a 2.5D and 3D curved display screen provided in an embodiment of the present application;

[0033] FIG4 is a schematic diagram of a four-curved display screen provided in an embodiment of the present application;

[0034] FIG5 is a schematic diagram of a curved smartwatch provided in an embodiment of the present application;

[0035] FIG6 is an exploded schematic diagram of the surface layer, screen stack and housing provided in an embodiment of the present application;

[0036] FIG7 is a schematic diagram of the assembly of the surface layer, screen stack and housing provided in an embodiment of the present application;

[0037] FIG8 is a schematic diagram of the stacking of a display screen provided in an embodiment of the present application;

[0038] FIG9 is a schematic diagram of a partial laminated structure of a first curved portion of a display module provided in an embodiment of the present application;

[0039] FIG10 is a schematic diagram of a laminated structure of a first curved portion of a display module provided in an embodiment of the present application;

[0040] FIG11 is a schematic diagram of a structure in which the four corners of the first connection layer are retracted according to an embodiment of the present application;

[0041] FIG12 is a partial stacking diagram of a display module including a second curved portion provided in an embodiment of the present application;

[0042] FIG13 is a schematic diagram of cutting edges during preparation of a display module according to an embodiment of the present application;

[0043] FIG14 is a schematic diagram of a structure in which the four corners and four sides of the first connection layer provided in an embodiment of the present application are retracted;

[0044] FIG15 is a schematic diagram of a partial laminated structure of a second curved portion of a display module provided in an embodiment of the present application;

[0045] FIG16 is a schematic diagram of the laminated structure of the second curved portion of the display module provided in an embodiment of the present application;

[0046] FIG17 is a schematic diagram of a curved raised edge provided in an embodiment of the present application;

[0047] FIG18 is a schematic diagram of redundancy definition provided in an embodiment of the present application;

[0048] FIG19 is a schematic diagram of a polygonal raised edge provided in an embodiment of the present application;

[0049] FIG20 is a schematic diagram of a hole structure provided in an embodiment of the present application;

[0050] FIG21 is a schematic diagram of a hole structure with an elongated opening provided in an embodiment of the present application;

[0051] FIG22 is a second schematic diagram of a hole structure with an elongated opening provided in an embodiment of the present application;

[0052] FIG23 is a schematic diagram of an elliptical opening of a hole structure provided in an embodiment of the present application;

[0053] FIG24 is a schematic diagram of an elliptical opening of a hole structure provided in an embodiment of the present application;

[0054] FIG25 is a schematic diagram of a circular hole structure opening provided in an embodiment of the present application;

[0055] FIG26 is a schematic diagram of a hole structure with a rounded rectangular opening provided in an embodiment of the present application;

[0056] FIG27 is a schematic diagram showing a wavy opening of a hole structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0057] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0058] It should be clear that the embodiments described 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.

[0059] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0060] It should be understood that the term "and / or" as used herein is simply a term used to describe the existence of three possible relationships between related objects. For example, "A and / or B" can represent the existence of A alone, the existence of both A and B, and the existence of B alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0061] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0062] It should be understood that the terms “first”, “second”, etc. used in this application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0063] In the description of this application, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They 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, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting this application.

[0064] When used in this application, "within the range of...", unless it is specifically stated that the end value is not included, it is assumed that both end values ​​of the range are included. For example, in the range of 1 to 5, the two values ​​1 and 5 are included.

[0065] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, a conflicting connection, or an integral connection; wherein the connection may be a direct connection or an indirect connection. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0066] In recent years, the technology used to manufacture display panels for electronic devices has advanced rapidly. Among them, flexible, bendable screens are widely used as curved screens in electronic devices. Currently, quad-curved displays, which offer better full-screen display quality, are widely used. Quad-curved displays have curved edges and corners. During the manufacturing process, particularly at the junctions between adjacent curved surfaces, at the four corners, the materials are easily squeezed, generating unrelieved stress, leading to wrinkles and affecting the display's visual quality.

[0067] This application provides an electronic device 100, which will be described below with reference to Figures 1 and 2. The electronic device 100 may include, but is not limited to, products with a display interface, such as a mobile phone, a tablet computer, a laptop computer, an ultra-mobile personal computer, a handheld computer, a walkie-talkie, an Internet-connected television, a wearable device, an in-vehicle device, a driving recorder, and a security device. The embodiments of this application do not impose any particular restrictions on the form of the electronic device 100.

[0068] For example, referring to FIG1 , an electronic device 100 in an embodiment of the present application is described using a curved screen mobile phone as an example. FIG1 is a schematic diagram of the electronic device 100 provided in an embodiment of the present application. FIG2 is a front view of the electronic device 100 provided in an embodiment of the present application. The electronic device 100 includes a display screen 10 and a housing 20 . The display screen 10 is connected to the housing 20 . The housing 20 may be a split structure or an integrated structure, which is not specifically limited in this embodiment.

[0069] The display screen 10 is mounted on the housing 20, wherein the housing 20 has a housing cavity, and components such as the circuit board, electronic components, camera module, processor and battery of the electronic device 100 can be mounted in the housing cavity of the housing 20. The housing 20 may include a middle frame and a back cover, and the middle frame and the back cover may be a split structure or an integrated structure, which is not specifically limited in the embodiment of the present application. The display screen 10 covers the opening of the housing cavity of the housing 20, and the display screen 10 and the housing 20 are sealed to form a sealed housing cavity, which protects the components in the housing cavity from water and dust. The housing 20 may be made of materials such as metal (such as aluminum alloy, titanium alloy and stainless steel), plastic (such as acrylonitrile-butadiene-styrene, polycarbonate and polypropylene) or glass (such as anti-glare glass). The housing 20 made of materials such as metal, plastic or glass can meet the requirements of wear resistance, impact resistance, corrosion resistance and aesthetics of the appearance of the electronic device 100.

[0070] In some possible implementations, the display screen 10 may be a four-curved screen, as shown in Figures 1 and 2 . The side edges of the display screen 10 in the four directions of the X direction, the opposite X direction, the Z direction, and the opposite Z direction are all curved toward the opposite Y direction. The four corners of the display screen 10 are also curved toward the opposite Y direction, thereby forming a four-curved display screen 10 with all edges curved. This application does not specifically limit the length of the curved side edges of the display screen 10. In one embodiment, the display module 11 may also be a dual-curved screen (not shown in the figure). For a dual-curved screen, refer to Figure 1 , where only the side edges of the display module 11 in the X direction and the opposite X direction are curved toward the opposite Y direction, while the side edges in the Z direction and the opposite Z direction are not curved.

[0071] The curved screen can be either a 2.5D or a 3D curved screen. Referring to Figure 3, in a 2.5D curved screen, the edges of the display screen in the X direction and the opposite X direction are curved only on the Y direction, while remaining flat on the opposite Y direction. In a 2.5D screen, only the outer edge of the surface layer (which can be a glass cover) can be curved, while the inner side of the surface layer is flat. With this structure, the polarizing layer, display panel, and backing film can all be flat. Referring to Figure 3, in a 3D curved screen, the edges of the display screen in the X direction and the opposite X direction are bent toward the opposite Y direction, with the outer surface on the Y direction forming a protruding curve and the inner surface on the opposite Y direction forming a concave curve.

[0072] In one embodiment, taking the four-curved screen mobile phone shown in FIG4 as an example, the display screen 10 in FIG4 may include a curved portion 101 and a non-curved portion 102. The curved portion 101 may be the curved portion of the display screen 10, or may be the side area of ​​the non-curved portion 102 described in FIG4 . Referring to FIG4 , the non-curved portion 102 of the electronic device may be a planar display portion, and the curved portion 101 may be located around the non-curved portion 102 to form a four-curved display screen. In one embodiment, the display screen 10 may have curved portions 101 only on two opposite sides of the non-curved portion 102 to form a hyperbolic display screen in a hyperbolic mobile phone. In some embodiments, the positions of the curved portion 101 and the non-curved portion 102 may not be specifically limited and may be designed according to the requirements of the electronic device.

[0073] In some possible embodiments, referring to FIG5 , FIG5 shows a schematic diagram of a dial of a smart watch, which also has a display screen 10 . The display screen 10 may also include a curved portion 101 and a non-curved portion 102 . The curved portion 101 may be located on the side of the non-curved portion 102 .

[0074] The present application provides a display screen 10 that can be applied to the electronic devices of the above-mentioned embodiments, such as the four-curved screen mobile phone shown in FIG1 , the outer curved smart watch shown in FIG5 , and electronic devices with curved sides such as dual-curved screens. In the embodiment of the present application, a four-curved screen mobile phone is used as an example. Referring to FIG6 , FIG7 and FIG8 , the display screen 10 may include a display module 11 and a support member 12. The display module 11 and the support member 12 are both plate-shaped, and the display module 11 and the support member 12 are stacked. Referring to FIG8 , the support member 12 may include a third connecting layer 121 and a supporting back plate 122. The supporting back plate 122 may be a film plate made of copper foil. The third connecting layer 121 is fixed to the supporting back plate 122 and the back film 115. The supporting back plate 122 may be copper foil to improve the support and bending resistance of the display screen. The supporting back plate 122 has a certain structural strength to meet the support strength requirements for the display module 11.

[0075] 8 , the display module 11 may include a surface layer 111, a first connection layer 112, a polarizing layer 113, a display panel 114, a second connection layer 116, and a back film 115. The surface layer 111, the first connection layer 112, the polarizing layer 113, the display panel 114, and the back film 115 are stacked sequentially along the Y direction. The surface layer 111 may be a glass cover plate, which may be a transparent glass cover plate so that the display panel 114 can display through the glass cover plate. The first connection layer 112 may be a transparent optically clear adhesive (OCA) layer, which can connect the surface layer 111 and the polarizing layer 113 to form an integral structure and facilitate the passage of light emitted by the display panel 114 for display. The stacked structure of the first connecting layer 112, the polarizing layer 113, the display panel 114, and the back film 115 constitutes the screen laminate 11a. The screen laminate 11a is located inside the surface layer 111. The surface layer 111 protects the screen laminate 11a, preventing water, dust, and other debris from entering the screen laminate 11a, and preventing the screen laminate 11a from being squeezed and damaged. The side edges of the surface layer 111 can be connected to the housing 20. For example, the screen laminate 11a is located in the cavity enclosed by the surface layer 111 and the housing 20.

[0076] The polarizing layer 113 may be a polarizing film (POL) used to prevent the reflection of external ambient light on the display module to improve the visibility of the display screen. The display panel 114 may be a display touch layer (Panel), which is clamped between the polarizing layer 113 and the back film 115 and can emit light as a display unit to realize the display of the display screen; at the same time, the display touch layer can also obtain the user's actions on the display screen, realize the acquisition of user actions, and convert them into electrical signals for processing to realize the interaction between the electronic device and the user. The back film 115 may be a back film provided on one side of the display panel 114. The display touch layer is mostly a flexible layer. The display panel 114 is attached to the back film 115, and the back film 115 provides support for the display panel 114.

[0077] In one embodiment, the surface layer 111 can be located on the display surface side of the display module 11. In this way, when the display screen 10 is installed on the electronic device 100, the surface layer 111 can protect the other layers of the display module 11 and allow light emitted by the display panel 114 to pass through. The material of the surface layer 111 includes but is not limited to glass and transparent polyimide. This application does not impose any specific restrictions on the material of the surface layer 111. With the rapid development of display panel manufacturing technology for electronic devices, bendable flexible screens are widely used as curved screens in electronic devices. Currently, when preparing a display screen 10 with curved sides such as those shown in Figures 4 and 5, a flat plate can be prepared in which the surface layer 111, the first connecting layer 112, the polarizing layer 113, the display panel 114 and the back film 115 are stacked in sequence. Then, the area to be bent is heated and a certain extrusion force is applied to cause the various layers of the display screen 10 to bend at the curved portion 101 to form a curved screen. However, during the bending process, a certain compressive force can be applied to the outer side of the surface layer 111 to cause the surface layer 111 to bend. When the surface layer 111 bends, a compressive force is applied to the polarizing layer 113 and the display panel 114 through the first connecting layer 112. Under the pressure of the surface layer 111, the other layers in the display module 11 are transformed from flat surfaces to curved surfaces. In particular, compressive stress is generated on the four sides of the display module 11 and at the intersecting corners, which can easily cause wrinkles. Wrinkles can cause structural defects in the display module 11 during the packaging process, affecting the display quality of the display screen 10.

[0078] The embodiment of the present application improves the display module 11 of the display screen 10 , which will be described below with reference to the accompanying drawings.

[0079] An embodiment of the present application provides a display module 11, as shown in Figures 9 and 10. Figure 9 shows a schematic diagram of a partial laminated structure of a first curved portion of a display module, and Figure 10 shows a schematic diagram of a laminated structure of a first curved portion of a display module 11. The curved portion 101 includes a first curved portion 101a. The first curved portion 101a may include the corner area shown in Figure 11, or the entire curved portion shown in Figure 5, etc. Any area where wrinkles may appear during bending preparation may be the first curved portion defined in the embodiment of the present application. The first curved portion 101a includes a surface layer 111, a first connecting layer 112, a polarizing layer 113, and a display panel 114 stacked along the Y direction. Within the first curved portion 101a: the thickness of at least a portion of the first connecting layer 112 gradually decreases, and the thickness of the first connecting layer 112 may gradually decrease from the center to the edge of the display screen. In the first curved portion 101a, the first connecting layer 112 presents an integral curved structure in the direction from the center to the edge of the display screen. In the entire curved area, the thickness of the first connecting layer 112 may gradually decrease in the entire first curved portion 101a, or the thickness may gradually decrease in only a part of the first curved portion 101a.

[0080] As shown in FIG10 , after the display module 11 is bent, the thickness of the first connection layer 112 gradually decreases from the center to the edge of the display screen within the first curved portion. For example, the thickness W1 of the first connection layer 112 near the center of the display screen is greater than the thickness W2 of the first connection layer 112 near the edge of the display screen. The thickness of the first connection layer 112 within the first curved portion gradually decreases from the center to the edge of the display screen, resulting in the first connection layer 112 within the first curved portion 101a having a thin outer layer and thick inner layer structure. When the display module 11 is bent, the effect of the extrusion force on the display panel 114 can be reduced (the closer to the edge, the greater the degree of bending), preventing the display panel 114 from being damaged by the large extrusion force. Furthermore, the curvature depth of the display panel 114 can be reduced while maintaining the surface shape of the surface layer 111 unchanged.

[0081] The thickness of the first connection layer 112 gradually decreases from the center to the edge of the display screen, which can reduce stress concentration and structural deformation when the first connection layer 112 is bent, maintaining the flatness of the surface of the bent first connection layer 112. Furthermore, the gradually decreasing thickness can reduce the squeezing force of the first connection layer 112 on the display panel 114, thereby reducing the bending depth of the display panel 114 while maintaining the surface shape of the surface layer 111. This reduces the possibility of wrinkling or other damage to the display panel 114 caused by redundant compression of the display module 11 at the bent portion, thereby improving the reliability and service life of the display module 11.

[0082] The first connecting layer 112 can be bonded and connected to the surface layer 111 and the polarizing layer 113 on both sides along the thickness direction, one side of the first connecting layer 112 is bonded and connected to the surface layer 111, and the other side of the first connecting layer 112 is bonded and connected to the polarizing layer 113, so that the first connecting layer 112 can be tightly bonded to the surface layer 111 and the polarizing layer 113, thereby preventing the first connecting layer 112 from moving and deforming due to uneven stress, thereby improving the stability of the overall structure of the display module 11.

[0083] In the display module 11 provided in the embodiments of the present application, when the display module 11 is bent, the first connection layer 112 is squeezed and extended toward the outer edges. Referring to Figures 9 and 10 , the arc length of the first connection layer 112 in the first curved portion 101a is less than the arc length of the display panel 114 in the first curved portion 101a. Referring to Figure 9 , in the first curved portion 101a, each stacked structure of the display module 11 is curved, with each stacked layer extending in an arc from the center to the edge of the display screen. The length in this extension direction (curved extension direction) is the arc length. As shown in FIG10 , the projection of the edge of the first connection layer 112 in the first curved portion on the display panel 114 along the stacking direction (see the arrow pointing to the position of the first connection layer 112 on the display panel 114 in the opposite Y direction in FIG10 ) is located on the side of the edge of the display panel 114 facing the non-curved portion 102. The stacking direction is the stacking direction of the surface layer 111, the first connection layer 112, and the display panel 114 in the first curved portion, and is inclined in the opposite Y direction in FIG10 . The edge of the first connection layer 112 can be located on the inner side of the edge of the display panel 114 (the inner side refers to the side of the edge of the display screen facing the center), which can reduce the volume of the first connection layer 112 between the surface layer 111 and the display panel 114 in the curved portion 101, alleviate the extrusion stress of the first connection layer 112 on the display panel 114 during bending preparation, and thereby reduce wrinkles on the display panel 114 due to extrusion. Within the first curved portion 101a, the thickness of the first connection layer 112 can gradually decrease from the center to the edge of the display screen. This reduces the curvature depth of the display panel 114 while maintaining the surface shape of the surface layer 111, further reducing wrinkles on the display panel 114. The first connection layer 112 connects the polarizing layer 113 and the surface layer 111, preventing the formation of voids that could cause stress imbalance and improving the overall structural stability of the display module 11.

[0084] In one possible embodiment, as shown in FIG9 , the ratio of the arc length L2 of the first connection layer 112 in the first curved portion 101a to the arc length L1 of the display panel 114 in the first curved portion 101a is in a range of 80% to 96%. Along the direction from the center of the display screen to the edge, the ratio of the arc length between the edge of the first connection layer 112 and the edge of the display panel 114 to the arc length of the display panel 114 is in a range of 4% to 20%. Specifically, FIG9 is a schematic diagram of a partial stacked structure of a display module provided in an embodiment of the present application. In FIG9 , in one side of the curved portion 101, the arc length of the display panel 114 in the first curved portion 101a is L1, and the arc length of the first connection layer 112 in the first curved portion 101a is L2. The ratio of arc length L2 to arc length L1 is in a range of 80% to 96%. The arc length between the edge of the first connection layer 112 and the edge of the display panel 114 is L3, which can be the difference between arc length L1 and arc length L2. The ratio of arc length L3 to arc length L1 ranges from 4% to 20%. Controlling the arc length difference between the edge of the first connection layer 112 and the edge of the display panel 114 within a range of 4% to 20% of the arc length of the display panel 114 reduces the possibility of wrinkles on the display panel 114 due to compression within the curved portion, ensures the bonding performance of the first connection layer 112 to the surface layer 111 and the polarizing layer 113, optimizes the curved display effect, better meets the display requirements of the curved display screen 10, improves the quality and performance of the display module, and provides users with a better viewing experience.

[0085] In some possible embodiments, refer to FIG. 11 , which is a schematic diagram of a structure in which the first connection layer is retracted at four corners according to an embodiment of the present application. In FIG. 11 , the first connection layer 112 is located on the display side of the display panel 114 (a polarizing layer is also provided between the first connection layer 112 and the display panel 114, but the polarizing layer is not shown in FIG. 11 ). In this embodiment, the display screen can be a polygonal structure similar to a rectangle, having multiple sides in the shape of straight lines or arcs, and having a corner area between two adjacent sides. The curved portion of the display module 11 includes a first curved portion 101a and a second curved portion 101b. The second curved portion 101b can include the curved portions of the four straight sides of the display screen. The first curved portion 101a can include the corner curved portion between two adjacent second curved portions 101b. The embodiment of the present application takes the first curved portion 101a as a corner curved portion and the second curved portion 101b as a side portion as an example, but does not limit the specific area range of the first curved portion 101a and the second curved portion 101b. It should be noted that when the display screen is a circular display screen similar to the watch dial shown in Figure 5, the curved portion of the display screen only has the first curved portion and does not have the second curved portion. The display screen described in this embodiment can be applied to electronic devices with quadrilateral or other polygonal shapes, such as mobile phones, tablets, and laptops.

[0086] The display module 11 has a first curved portion 101a in a corner region. The corner region of the display module 11 is where two adjacent sides of the display module 11 meet. Within the first curved portion 101a (see the structure of the second connection layer shown in Figures 9 and 10 ), the edge of the first connection layer 112 is located inboard of the edge of the display panel 114. The thickness of the first connection layer 112 can gradually decrease from the center to the edge of the display screen.

[0087] During the bending process of the display module 11, the surface layer 111 compresses the first connection layer 112 in a horizontal direction (aligned with the extension surface of the first connection layer 112), causing wrinkles in the thickness direction of the first connection layer 112. This, in turn, causes wrinkles in the display panel 114 when the display panel 114 is compressed. Such wrinkles are particularly noticeable in the first curved portion 101a. Within the first curved portion 101a, the surface layer 111, the first connection layer 112, and the display panel 114 are curved. The arc length of the first connection layer 112 is less than that of the display panel 114. The edge of the first connection layer 112 is located inboard of the edge of the display panel 114. The thickness of the first connection layer 112 gradually decreases from the center to the edge of the display screen. This reduces the compressive stress of the first connection layer 112 on the display panel 114 in the first curved portion 101a in the corner area when the display panel 114 is bent, thereby reducing the possibility of wrinkles on the display panel 114 at the first curved portion 101a and improving the appearance quality and aesthetics of the display module 11.

[0088] In one possible embodiment, as shown in FIG11 , the display module 11 has a second curved portion 101b on a side. The second curved portion 101b may be located between two adjacent first curved portions 101a. The second curved portions 101b may be four linear curved portions on the side edges of the display screen 10. The area where the second curved portions 101b on two adjacent sides of the display screen 10 intersect is the first curved portion 101a. The first curved portion 101a and the second curved portion 101b curve and extend toward the non-display side of the display panel 114, giving the display screen 10 a curved surface.

[0089] Referring to Figures 11 and 12, Figure 12 shows a schematic diagram of a partial stack of layers of a display module including a second curved portion. Within the second curved portion 101b, the thickness of the first connecting layer 112 can be evenly distributed along the direction from the center to the edge of the display screen. The thickness of the first connecting layer 112 is equal at any position along the direction from the center to the edge of the display screen. The first connecting layer 112 is bonded to the surface layer 111 and the polarizing layer 113 on both sides along the thickness direction. The upper surface of the first connecting layer 112 is bonded to the lower surface of the surface layer 111, and the lower surface of the first connecting layer 112 is bonded to the upper surface of the polarizing layer 113. This allows the first connecting layer 112 to be tightly bonded to the surface layer 111 and the polarizing layer 113, preventing the first connecting layer 112 from moving and deforming due to uneven stress, thereby improving the stability of the overall structure of the display module 11.

[0090] In one embodiment, the edge of the first connection layer 112 is flush with the edge of the display panel 114 along the thickness direction. The projections of the edge of the first connection layer 112 and the edge of the display panel 114 along the thickness direction overlap.

[0091] When preparing a display screen, a flat display screen is usually prepared first, and the layers in the display screen are stacked and arranged. The pre-prepared size is larger than the size of the display screen applied to the electronic device, and the target size is prepared by cutting the edge portion of the flat display screen. In the embodiment of the present application, the first connection layer 112 is flush with the edge of the second curved portion 101b and the upper and lower layers. Referring to Figure 13, after cutting off the edge portion along the dotted line portion shown in Figure 13 (the left side of the dotted line in Figure 13), the edge portion will be removed as a whole, which can prevent the cut edge portion from being dispersed into multiple small parts and pasted on the display layer on the right side of the dotted line in Figure 13, ensuring the subsequent preparation and normal use of the display screen, and reducing the complexity of the display screen preparation process.

[0092] As shown in FIG13 , a release film 1121 can also be provided on the upper surface of the first connecting layer 112. The release film 1121 can securely connect the surface layer 111 and the first connecting layer 112. During display screen processing, in the resulting large-scale, flat-panel display screen, the edge of the first connecting layer 112 and the edge of the display panel 114 are flush along the thickness direction. Alternatively, the edge of the first connecting layer 112 can be located on one side of the display panel 114 along the direction from the center of the display screen to the edge. When the first connecting layer 112, polarizing layer 113, display panel 114, and back film 115 are cut along the cutting line, the excess polarizing layer 113, display panel 114, back film 115, and first release film 1121 can be bonded together through the first connecting layer 112, facilitating their removal after cutting, thereby improving processing efficiency. Bonding the various layers of material together through the first connecting layer 112 makes it easier to remove waste material after cutting, reduces residue during processing, and helps improve processing accuracy and product quality.

[0093] In one possible embodiment, referring to FIG. 14 , which is a schematic diagram of a structure in which the first connection layer provided in the embodiment of the present application is recessed at all four corners and sides, within the first curved portion 101a and the second curved portion 101b, the edges of the first connection layer 112 are both located on one side of the edge of the display panel 114 along the direction from the edge to the center of the display screen, and the thickness of the first connection layer 112 gradually decreases along the direction from the center to the edge of the display screen. Referring to FIG. 9 and FIG. 10 , within the first curved portion 101a, the thickness of at least a portion of the first connection layer 112 gradually decreases. The thickness of the first connection layer 112 can gradually decrease along the direction from the center to the edge of the display screen. Within the first curved portion 101a, the first connection layer 112 forms an overall curved structure along the direction from the center to the edge of the display screen. Within the entire curved region, the thickness of the first connection layer 112 can gradually decrease throughout the entire first curved portion 101a, or it can be a structure in which the thickness gradually decreases only within a portion of the first curved portion 101a. As shown in Figures 15 and 16 , within the second curved portion 101b, the thickness of at least a portion of the first connection layer 112 gradually decreases. The thickness of the first connection layer 112 may gradually decrease from the center to the edge of the display screen. Within the second curved portion 101b, the first connection layer 112 forms an integral curved structure from the center to the edge of the display screen. Within the entire curved region, the thickness of the first connection layer 112 may gradually decrease throughout the entire second curved portion 101b, or may only have a gradually decreasing thickness within a portion of the second curved portion 101b. The first connecting layer 112 in the first curved portion 101a and the second curved portion 101b is respectively bonded and connected to the surface layer 111 and the polarizing layer 113 on both sides along the thickness direction. The upper surface of the first connecting layer 112 is bonded and connected to the lower surface of the surface layer 111, and the lower surface of the first connecting layer 112 is bonded and connected to the upper surface of the polarizing layer 113, so that the first connecting layer 112 can be tightly bonded to the surface layer 111 and the polarizing layer 113, thereby preventing the first connecting layer 112 from moving and deforming due to uneven stress, thereby improving the stability of the overall structure of the display module 11.

[0094] As shown in FIG14 , the first connection layer 112 exhibits an inwardly constricted structure in both the first curved portion 101a and the second curved portion 101b. The edge of the first connection layer 112 may be located on one side of the edge of the display panel 114 along the direction from the edge to the center of the display screen, and the thickness of the first connection layer 112 may gradually decrease from the center to the edge of the display screen. As shown in FIG16 , after the display module 11 is bent, the thickness of the first connection layer 112 gradually decreases from the center to the edge of the display screen within the second curved portion 101b. For example, the thickness W3 of the first connection layer 112 near the center of the display screen is greater than the thickness W4 of the first connection layer 112 near the edge of the display screen. The thickness of the first connection layer 112 within the second curved portion gradually decreases from the center to the edge of the display screen, resulting in the first connection layer 112 within the second curved portion 101b having a thin outer portion and thick inner portion structure. When the display module 11 is bent, the impact of the extrusion force on the display panel 114 is reduced (the closer to the edge, the greater the degree of curvature), preventing damage to the display panel 114 due to the large extrusion force. Furthermore, the curvature depth of the display panel 114 is reduced while maintaining the surface shape of the surface layer 111. The display screen bends throughout the entire curved portion, and the second connection layer in the curved portion exhibits an inwardly contracted structure. This prevents the second connection layer from being squeezed to a certain extent and wrinkling when the display screen is bent, thereby improving the display quality of the display panel in the display screen.

[0095] In one embodiment, only the first connection layer 112 in the second curved portion 101b may be retracted. The edge of the first connection layer 112 in the second curved portion 101b may be located on one side of the edge of the display panel 114 along the direction from the edge to the center of the display screen, and the thickness of the first connection layer 112 may gradually decrease along the direction from the center to the edge of the display screen. The thickness of the first connection layer 112 in the first curved portion 101a may be evenly distributed along the direction from the center to the edge of the display screen, with the thickness of the first connection layer 112 being the same at any position along the direction from the center to the edge of the display screen. Furthermore, the edge of the first connection layer 112 in the first curved portion 101a is flush with the edge of the display panel 114 along the thickness direction, thereby preventing wrinkles during the preparation of the second curved portion 101b.

[0096] In one embodiment, when the display module 11 is curved, the first connection layer 112 is squeezed and extended toward the outer edge. Referring to Figures 15 and 16 , the arc length of the first connection layer 112 in the second curved portion 101b is less than the arc length of the display panel 114 in the second curved portion 101b. Referring to Figure 15 , in the second curved portion 101b, each stacked structure of the display module 11 is curved, with each stacked layer extending in an arc from the center to the edge of the display screen. The length in this extension direction (curved extension direction) is the arc length. As shown in FIG16 , the projection of the edge of the first connection layer 112 in the second curved portion 101 b onto the display panel 114 along the stacking direction (see the arrow pointing to the position of the first connection layer 112 on the display panel 114 in the opposite Y direction in FIG16 ) is located on the side of the edge of the display panel 114 facing the non-curved portion 102. The stacking direction is the stacking direction of the surface layer 111, the first connection layer 112, and the display panel 114 in the second curved portion 101 b, and is inclined in the opposite Y direction in FIG16 . The edge of the first connection layer 112 can be located on the inner side of the edge of the display panel 114 (the inner side refers to the side of the edge of the display screen toward the center), which can reduce the volume of the first connection layer 112 between the surface layer 111 and the display panel 114 in the second curved portion 101 b, alleviate the extrusion stress of the first connection layer 112 on the display panel 114 during bending preparation, and thereby reduce wrinkles on the display panel 114 due to extrusion. Within the second curved portion 101b, the thickness of the first connection layer 112 can gradually decrease from the center to the edge of the display screen. This reduces the curvature depth of the display panel 114 while maintaining the surface shape of the surface layer 111, further reducing wrinkles on the display panel 114. The first connection layer 112 connects the polarizing layer 113 and the surface layer 111, preventing the formation of voids that could cause stress imbalance and improving the overall structural stability of the display module 11.

[0097] In one possible embodiment, as shown in FIG15 , the ratio of the arc length L5 of the first connection layer 112 in the second curved portion 101b to the arc length L4 of the display panel 114 in the first curved portion 101a is in a range of 80% to 96%. Along the direction from the center of the display screen to the edge, the ratio of the arc length from the edge of the first connection layer 112 to the arc length of the display panel 114 is in a range of 4% to 20%. Specifically, FIG15 is a schematic diagram of a partial stacked structure of a display module provided in an embodiment of the present application. In FIG15 , in one side of the curved portion 101, the arc length of the display panel 114 in the second curved portion 101b is L4, and the arc length of the first connection layer 112 in the second curved portion 101b is L5. The ratio of arc length L5 to arc length L4 is in a range of 80% to 96%. The arc length L6 between the edge of the first connection layer 112 and the edge of the display panel 114 is L6. Arc length L6 can be the difference between arc lengths L4 and L6. The ratio of arc length L6 to arc length L4 is in a range of 4% to 20%. The difference in arc length between the edge of the first connecting layer 112 and the edge of the display panel 114 is controlled within a range of 4% to 20% of the arc length of the display panel 114, thereby reducing the possibility of wrinkles on the display panel 114 due to squeezing in the second curved portion, and ensuring the bonding performance of the first connecting layer 112 to the surface layer 111 and the polarizing layer 113, thereby optimizing the curved display effect, thereby better adapting to the display requirements of the curved display screen 10, improving the quality and performance of the display module, and providing users with a better viewing experience.

[0098] In some possible embodiments, as shown in FIG17 , at least two protrusions 1122 are provided on the edge of the first connection layer 112. The protrusions 1122 protrude outward from the edge of the first connection layer 112 in the direction from the center of the display screen to the edge. At least two protrusions 1122 are spaced apart along the extension direction of the edge of the first connection layer 112. The spacing between two adjacent protrusions 1122 is not limited herein. Each protrusion 1122 protrudes outward from the first connection layer 112 in the direction from the center of the display screen to the edge. The protruding directions of the protrusions 1122 may be parallel or non-parallel to each other, and each protrusion 1122 can be independently provided. The protrusions 1122 are provided in the area of ​​the first connection layer 112 that is recessed relative to the display panel 114, and may be within the first curved portion or the second curved portion. The embodiments of the present application are described using the first curved portion as an example.

[0099] The multiple protrusions 1122 on the edge of the first connecting layer 112 can provide a buffer for the stress in the stress-concentrated area of ​​the first curved portion 101a of the display module 11. A portion of the stress can be released by deforming the multiple protrusions in the direction indicated by the arrows in Figure 17, thereby dispersing the large wrinkles formed in the stress-concentrated area into multiple small wrinkles, thereby reducing the occurrence of wrinkles at the first curved portion 101a of the display module 11.

[0100] As shown in FIG17 , multiple protrusions 1122 are provided on the edge of the first connecting layer 112, with recesses 1123 formed between the protrusions 1122. The provision of protrusions 1122 effectively reduces the degree of wrinkling in the first connecting layer 112 after bending, primarily by reducing the redundancy of the first connecting layer 112 after bending from a flat surface to a curved surface. Redundancy can be defined as the compression ratio of the arc length in the flat state to the arc length in the curved state. FIG18 illustrates a schematic diagram of the curved surface formed by bending the upper first connecting layer 112, which is flat, and the lower first connecting layer 112, which is flat, under pressure from the surface layer. The arc length L7 of the upper, flat first connecting layer 112, when bent downward, compresses the arc length L8 of the lower, curved first connecting layer 112 by a certain percentage, with arc length L8 being smaller than arc length L7. The amount of compression of arc length L8 relative to arc length L7 represents the redundancy. Redundancy can be understood as the difference between arc length L7 and arc length L8, and the ratio of arc length L7. The greater the compression, the more wrinkles will be formed on the compressed part. In this application, by setting a protrusion 1122, when the edge of the planar first connecting layer 112 is bent, as shown in the enlarged view in Figure 18, the bottom sides of the protrusion 1122 will be stretched to the left and right sides (the dotted line at the bottom of the protrusion 1122 in Figure 18 is a schematic diagram in a planar state, and the solid line part formed after bending is stretched to both sides compared to the dotted line), so that the first connecting layer 112 will not cause greater compression after bending, reducing redundancy, and reducing or even eliminating the generation of wrinkles.

[0101] In one embodiment, as shown in FIG17 , within the first curved portion 101a, a plurality of protrusions 1122 are provided on the edge of the first connection layer 112. The edges of the protrusions 1122 form a portion of the edge of the first connection layer 112. The edges of the protrusions 1122 can smoothly transition to the remaining edges of the first connection layer 112, allowing for transitions between adjacent protrusions 1122. The edge of a protrusion 1122 may refer to an edge 1122a of the protrusion 1122 protruding from the center of the display screen to the edge of the display screen, while the remaining edges of the first connection layer 112 may refer to an edge 1122b of the non-protruding portion of the first connection layer 112 connecting to the protrusion 1122. Both the edge 1122a of the protrusion 1122 and the remaining edges 1122b of the first connection layer 112 shown in FIG17 are smoothly transitioned curves. During the bending process, the connection between the protrusion 1122 and the non-protruding portion of the first connection layer 112 is a curved line. This curve creates a smooth transition, avoiding sharp turns and making the deformation distribution between the protrusion 1122 and the first connection layer 112 more uniform. The smoothly curved protrusion 1122 reduces the risk of the protrusion 1122 causing cracks or damage to other structures in the display module 11.

[0102] In one embodiment, as shown in FIG19 , within the first curved portion 101a, a plurality of protrusions 1122 are provided on the edge of the first connection layer 112. The edges of the protrusions 1122 form a portion of the edge of the first connection layer 112. The edges of the protrusions 1122 can smoothly transition to the remaining edges of the first connection layer 112, allowing for transitions between adjacent protrusions 1122. The edges of the protrusions 1122 can be polygonal, i.e., the edge 1122a of the protrusion 1122 shown in FIG19 is polygonal, while the remaining edges 1122b of the first connection layer 112 are smoothly curved, allowing for radial protrusions to appear between adjacent protrusions.

[0103] In one embodiment, as shown in FIG19 , a plurality of protrusions 1122 are provided on the edge of the first connection layer 112 within the first curved portion 101a. The edges of the protrusions 1122 constitute a portion of the edge of the first connection layer 112. The edges of the protrusions 1122 can smoothly transition to the rest of the edge of the first connection layer 112, allowing for transitions between adjacent protrusions 1122. The edges of the protrusions 1122 can be polygonal in shape, i.e., the edge 1122a of the protrusion 1122 shown in FIG19 is polygonal in shape, while the rest of the edge 1122b of the first connection layer 112 is polygonal in shape.

[0104] It will be appreciated that within the second curved portion 101b, or within both the first curved portion 101a and the second curved portion 101b, multiple protrusions 1122 are also provided on the edge of the first connection layer 112. These protrusions 1122 protrude outward from the first connection layer 112 in the direction from the center of the display screen to the edge. These protrusions 1122 are spaced apart along the extension direction of the edge of the first connection layer 112. The edges of these protrusions 1122 can be polygonal or smoothly curved. The edges 1122a of these protrusions 1122 smoothly transition with the remaining edges 1122b of the first connection layer 112. The specific implementation of these protrusions 1122 within the second curved portion 101b is substantially the same as that within the first curved portion 101a and will not be further described here.

[0105] It should be noted that the position, shape, and size of the multiple protrusions 1122 on the edge of the first connection layer 112 are affected by the stress applied to the display module 11 within the first curved portion 101a and / or the second curved portion 101b. Depending on the magnitude and direction of the stress applied to the display module 11, the design parameters such as the position, shape, and size of the multiple protrusions 1122 on the edge of the first connection layer 112 may also be different. For example, referring to the enlarged view in FIG19 , in the display module 11 of the first curved portion 101a, the greater the height H of the protrusions 1122 along the direction from the center to the edge of the display screen, the greater the degree to which the sidewalls of the protrusions 1122 stretch toward the sides when the first connection layer 112 is bent from a flat surface to a curved surface, which is more conducive to reducing redundancy during the bending process and thus better reducing wrinkles formed during bending. Furthermore, multiple protrusions 1122 may be provided in each first curved portion 101a. For example, multiple protrusions 1122 may be provided in each of the four first curved portions 101a. This maximizes stress relief in the region of the first curved portions 101a, thereby reducing the likelihood of wrinkles in the first curved portions 101a. Of course, multiple protrusions 1122 may also be provided in one, two, or three of the first curved portions 101a. Parameters such as the position, shape, and size of the multiple protrusions 1122 on the edge of the first connection layer 112 in different curved portions (the first curved portion 101a and the second curved portion 101b) may be the same or different.

[0106] In some possible embodiments, as shown in FIG20 , the display module 11 further includes a thinning layer having a hole structure 131 thereon. The thinning layer may be at least one of the polarizing layer 113, the back film 115, and the support member 12. The polarizing layer 113, the back film 115, and the support member 12 are stacked along the thickness direction. In the embodiment of the present application, the polarizing layer 113, the back film 115, and the support member 12 are all thinning layers as an example. The hole structure 131 is provided on each of the polarizing layer 113, the back film 115, and the support member 12. In one embodiment, the support member 12 may include a third connecting layer 121 and a supporting back plate 122. The hole structure may be provided only on the third connecting layer 121, only on the supporting back plate 122, or on both the third connecting layer 121 and the supporting back plate 122. The hole structure 131 is used to reduce the thickness of the thinning layer along the thickness direction in the area covered by the hole structure 131. The hole structure 131 is used to reduce the stress and strain in the stress concentration area of ​​the display panel 114 in the first curved portion that is prone to wrinkles. By setting the hole structure 131, the deformation of the hole structure 131 is used to absorb the large stress and strain generated during the bending process of the display module 11, so that the deformation of the display panel 114 is released through the hole structure 131, thereby preventing the display module 11 from wrinkling in the first curved portion 101a.

[0107] In this embodiment, the hole structure 131 is used to reduce the structural strength of the thinning layer at the corresponding position, making the thinning layer easier to bend and deform, so as to better adapt to bending and closely adhere to the first curved portion 101a of the display screen 10, thereby avoiding wrinkles on the first curved portion 101a.

[0108] The thinning layer can be only one of the polarizing layer 113, the back film 115 and the support member 12, and the hole structure 131 is only provided on one layer structure among the polarizing layer 113, the back film 115 and the support member 12. The thinning layer can also be a combination of any two of the polarizing layer 113, the back film 115 and the support member 12. The hole structure 131 can be provided on one or two layer structures among the polarizing layer 113, the back film 115 and the support member 12. The thinning layer can also include the polarizing layer 113, the back film 115 and the support member 12 three layers at the same time, and the hole structure 131 can also be provided in at least one layer structure in the thinning layer. The method of providing the hole structure 131 in the thinning layer can be laser laser, etching, punching and other processes.

[0109] In one embodiment, referring to FIG. 20 , a stacked polarizing layer 113, a backing film 115, and a support member 12 are used as an example. The hole structure 131 may be a blind hole. A blind hole refers to a hole whose depth is less than the thickness of the thinning layer. The hole depth is the depth of the blind hole along the thickness direction of the thinning layer. For example, the hole structures provided on the support member 12 and the backing film 115 in FIG. 20 may be blind holes. This embodiment uses the example of providing the hole structure 131 only on the support member 12. The opening of the blind hole provided on the support member 12 may be provided on the lower surface facing away from the backing film 115, while the opening of the blind hole provided on the backing film 115 may be provided on the upper surface facing the second connecting layer 116. The opening direction of the blind hole can be set according to different needs and designs and is not limited in this embodiment of the application. The opening of the blind hole is in the shape of an elongated strip as shown in FIG. 21 . Multiple blind holes are spaced apart within the curved portion to prevent adjacent blind holes from connecting and significantly affecting the structure and function of the thinning layer.

[0110] In one embodiment, the opening of the blind hole provided on the support member 12 can be provided on the upper surface facing the back film 115, and the opening of the blind hole provided on the back film 115 can be provided on the lower surface facing away from the second connection layer 116. During preparation, the second connection layer 116 and the back film 115 can be fixed into an integral structure, and the blind hole can be opened on the upper surface of the back film 115. The blind hole structure can be formed in the thinning layer by perforating the back film 115 using laser engraving technology, without the perforation passing through the back film 115. The thinning layer with the blind hole structure is then fixed to other laminated structures in the display module 11.

[0111] In one embodiment, as shown in FIG20 , the hole structure 131 may be a through hole. A through hole is a hole that penetrates a layer in which the hole structure is located, such as the hole that penetrates the polarizing layer 113 in FIG20 . The through hole openings are located on the upper and lower surfaces of the polarizing layer 113. The through hole openings may be circular, and multiple through holes are spaced apart within the curved portion 101 to prevent adjacent through holes from connecting and significantly affecting the structure and function of the thinning layer.

[0112] In one embodiment, within the first curved portion 101a and the second curved portion 101b, a hole structure 131 is provided on both the support member 12 and the back film 115 on the non-display side of the display panel 114. The display side of the display panel 114 is connected to the surface layer 111 via a first connection layer 112 to form an integrated display module structure. Within the first curved portion 101a and the second curved portion 101b, the edge of the first connection layer 112 is located on the edge of the display panel 114 along the direction from the edge to the center of the display screen.

[0113] In some possible embodiments, the openings of the hole structure 131 may be rectangular, circular, elliptical, rounded rectangular, waist-shaped, or wavy. Figures 21 and 22 are schematic diagrams of the hole structure 131 with an opening in the shape of a strip, Figures 23 and 24 are schematic diagrams of the hole structure 131 with an opening in the shape of an ellipse, Figure 25 is a schematic diagram of the hole structure 131 with an opening in the shape of a circle, Figure 26 is a schematic diagram of the hole structure 131 with an opening in the shape of a rounded rectangle, and Figure 27 is a schematic diagram of the hole structure 131 with an opening in the shape of a wave.

[0114] Multiple hole structures 131 can be provided within the first curved portion 101a, and the layout of the multiple hole structures 131 within the first curved portion 101a can be varied. For example, as shown in Figures 22, 24, and 26, the multiple hole structures 131 are arranged in a divergent pattern along the direction from the center to the edge of the display screen. That is, as the multiple hole structures 131 extend from the center to the edge of the display screen, the spacing between different hole structures 131 near the edge of the thinning layer is greater than the spacing between different hole structures 131 away from the edge of the thinning layer, thereby reducing stress concentration on the display panel 114 within the first curved portion 101a to a greater extent. For another example, as shown in Figures 23 and 25, the multiple hole structures 131 are randomly arranged within the first curved portion 101a. For another example, as shown in Figures 21 and 27, the extension directions of the multiple hole structures 131 within the first curved portion 101a are parallel to each other. The shapes, sizes, and layouts of the different hole structures 131 on the thinning layer can be the same or different. A matching design can be made based on the bending process and the extrusion force received by the display module 11 during use, and this application does not impose any restrictions on this.

[0115] In some embodiments, a hole structure 131 can be provided on the thinned layer in each first curved portion 101a. For example, a hole structure 131 can be provided in all four first curved portions 101a. This can better relieve stress on the display panel 114 within the first curved portions 101a, significantly reducing the probability of wrinkles in the display panel 114. Of course, the hole structure 131 can also be provided in one first curved portion 101a, all first curved portions 101a, or all three first curved portions 101a. This is not a limitation and can be selected as needed.

[0116] The multiple hole structures 131 described in this embodiment can release the extrusion force on the display module 11 by adjusting the proportion of the hole structure 131 on the curved thinning layer to the overall area of ​​the thinning layer, as well as parameters such as the depth and spacing distance of the hole structure 131 in the thinning layer, according to the different extrusion forces applied to the display module 11 during the bending process and use. This ensures that the various layer structures in the display module 11, especially the display panel 114, are not squeezed by other layered structures in the first curved portion 101a to produce wrinkles, thereby ensuring that the display module 11 can better fit and connect with the first curved portion 101a.

[0117] In some other embodiments of the present application, it is understood that the hole structure 131 on the thinned layer can be provided in the second curved portion 101b. The hole structure 131 can be provided on at least one of the polarizing layer 113, the backing film 115, and the support layer 12 in the second curved portion 101b. The hole structure 131 can be at least one of a through hole and a blind hole. The shape and number of the hole structure in the second curved portion 101b are also not limited. The method for providing the hole structure 131 in the second curved portion 101b can be consistent with the method for providing the hole structure 131 in the first curved portion 101a, and will not be repeated here.

[0118] The present application also provides a method for preparing a display module hole structure, comprising the following steps:

[0119] Step S100: preparing a large display panel;

[0120] First, a large display panel is prepared, wherein the large panel refers to the display panel before being cut into a target shape and size. The large display panel may be a touch display panel structure.

[0121] Step S200: Laminating a back film on a large display panel to form a composite large panel;

[0122] The back film with a certain supporting strength is attached to the large display panel to form a composite large panel.

[0123] Step S300: preparing a hole structure on the back film of the composite board;

[0124] A hole structure is prepared on the formed composite large board of the stacked structure. The hole structure can be a blind hole on the back film or a through hole on the back film.

[0125] Step S400: cutting the composite large board into a plurality of composite small boards.

[0126] The composite large board with a hole structure is cut to achieve a partial hole opening process in the screen laminate to form a display panel with a hole structure and a partial display module of the back film. The shape of the hole structure can be any of the structures shown in Figures 21, 22, 23, 24, 25, 26, and 27.

[0127] In one embodiment, a hole structure can be prepared on the back film of the composite large board by using a process such as laser engraving.

[0128] The present application also provides a method for preparing a display module hole structure, comprising the following steps:

[0129] Step S100: preparing a large display panel;

[0130] First, a large display panel is prepared, wherein the large panel refers to the display panel before being cut into a target shape and size. The large display panel may be a touch display panel structure.

[0131] Step S200: cutting the large display panel into a plurality of small display panel panels;

[0132] According to the shape and size of the required product, the large display panel is cut into multiple small display panel panels.

[0133] Step S300, preparing a back film plate;

[0134] A large-sized back film can be prepared first, and then cut into small back film panels that match the shape and size of the display panel panels.

[0135] Step S400, preparing a hole structure on the back film plate;

[0136] A hole structure is prepared on the prepared back film plate. The hole structure can be a blind hole on the back film or a through hole on the back film.

[0137] Step S500: Laminating the display panel platelet and the back film platelet to implement a partial perforation process for the screen lamination to form a display panel and a partial display module with a perforated structure. This can be any of the structures shown in Figures 21, 22, 23, 24, 25, 26, and 27.

[0138] In one embodiment, a hole structure can be prepared on the back film plate by laser engraving or die cutting.

[0139] The present application also provides an electronic device 100, comprising a housing 20 and any of the above-described display modules 11. The housing 20 has an opening on one side, and the display module 11 is positioned within the opening of the housing 20, with the edge of the display module 11 matingly connected to the edge of the opening. The housing 20 is used to secure and support the display module 11 and prevent external impurities such as moisture and dust from affecting the performance of the display module 11.

[0140] The electronic device 100 provided in the present application has an edge of the first connection layer 112 located on one side of the edge of the display panel 114 in the direction from the center of the display screen to the edge of the display screen. The thickness of the first connection layer 112 gradually decreases along the direction from the center of the display screen to the edge of the display screen. The first connection layer 112 is bonded to the surface layer 111 and the display panel 114 on both sides along the thickness direction. Within the first curved portion 101a, by arranging the edge of the first connection layer 112 on one side of the edge of the display panel 114 in the direction from the center of the display screen to the edge of the display screen, the thickness of the first connection layer 112 gradually decreases along the direction from the center of the display screen to the edge of the display screen. The first connection layer 112 is bonded to the surface layer 111 and the display panel 114 on both sides along the thickness direction. This can alleviate the compressive stress of the first connection layer 112 on the display panel 114, reducing wrinkles on the display panel 114 due to compression. The electronic device 100 having this display module 11 is less likely to have wrinkles at corners, and has a better display effect.

[0141] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A display module, characterized in that, The display module includes a surface layer, a first connection layer, and a display panel that are stacked. The display module includes a non-bending portion and a bending portion. The bending portion includes a first bending portion, and the thickness of the first connection layer in the first bending portion gradually decreases.

2. The display module according to claim 1, wherein The arc length of the first connection layer in the first bending portion is less than the arc length of the display panel in the first bending portion.

3. The display module according to claim 2, wherein The ratio of the arc length of the first connection layer in the first bending portion to the arc length of the display panel in the first bending portion is in the range of 80% to 96%.

4. The display module according to any one of claims 1-3, characterized in that, The first bending portion includes a corner area of the display module.

5. The display module according to any one of claims 1-4, characterized in that The bending portion further includes a second bending portion. The second bending portion includes a side portion of the display module, and the thickness of the first connection layer in the second bending portion is evenly distributed.

6. The display module according to claim 5, wherein The edge of the first connection layer in the second bending portion is flush with the edge of the display panel in the second bending portion.

7. The display module according to any one of claims 1-4, characterized in that, The bending portion further includes a second bending portion. The second bending portion includes a side portion of the display module, and the thickness of the first connection layer in the second bending portion gradually decreases.

8. The display module according to claim 7, wherein The arc length of the first connection layer in the second bending portion is less than the arc length of the display panel in the second bending portion.

9. The display module according to claim 8, wherein The ratio of the arc length of the first connection layer in the second bending portion to the arc length of the display panel in the second bending portion is in the range of 80% to 96%.

10. The display module according to any one of claims 1-9, characterized in that, The first connection layer is provided with protrusions on its edge.

11. The display module according to claim 10, wherein, The number of the protrusions is at least two, and at least two of the protrusions are arranged at intervals along the extending direction of the edge of the first connection layer.

12. The display module according to claim 10 or 11, wherein The edge of the protrusion is smoothly and transitionally connected to the edge of the non-protrusion portion of the first connection layer.

13. The display module according to any one of claims 10 to 12, characterized in that, The edge of the protrusion is polygonal or curved.

14. The display module according to any one of claims 1-13, characterized in that, The display module further includes at least one of a polarizing layer, a back film, and a support member. Inside the bending portion: a hole structure is provided on at least one of the polarizing layer, the support member, and the back film.

15. The display module according to claim 14, wherein The hole structure includes at least one of a through hole and a blind hole.

16. The display module according to claim 14 or 15, characterized in that, The opening shape of the hole structure includes at least one of a rectangle, a circle, an ellipse, a rounded rectangle, a waist shape, and a wavy shape.

17. An electronic device, characterized in that, Including the display module according to any one of claims 1-16, further including a housing, and the housing is fixedly connected to the peripheral edge of the display module.

18. A method for preparing a hole structure of a display module, characterized in that, Including the following steps: Preparing a large display panel; Attaching a back film to the large display panel to form a composite large panel, preparing a hole structure on the back film of the composite large panel, and then cutting the composite large panel into a plurality of composite small panels; or, first cutting the large display panel into a plurality of small display panels, preparing small back film panels, preparing a hole structure on the small back film panels, and then attaching the small display panels and the small back film panels.

19. The preparation method of the hole structure of the display module according to claim 18, characterized in that, The step of preparing the hole structure on the back film of the composite large panel includes: preparing the hole structure on the back film of the composite large panel by laser engraving; and / or, the step of preparing the hole structure on the small back film panels includes: preparing the hole structure on the small back film panels by laser engraving or die cutting.

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