Display modules and electronic devices

Abstract

A display module and an electronic device, relating to the field of display technology, wherein the display module comprises a stacked surface layer, a first connection layer and a display panel, the display module comprises a non-bending portion and a bending portion, the bending portion comprises a first bending portion, and the thickness of the first connection layer in the first bending portion gradually decreases. In the display module provided by the present application, when the display module is bent, the first connection layer will be squeezed and extended in the direction of the outer edge, and in the first bending portion, the thickness of the first connection layer will gradually decrease along the first direction, which can reduce the bending depth of the display panel while maintaining the surface shape of the surface layer unchanged, further reducing the wrinkles generated by the display panel; the display panel and the surface layer are connected by the first connection layer, so as to prevent the occurrence of voids causing stress imbalance and improve the stability of the overall structure of the display module.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display module and an electronic device. Background Art

[0002] In recent years, the display panel manufacturing technology for electronic devices has developed rapidly, among which bendable flexible screens are widely used as curved screens in electronic devices. At present, four-curved display screens with better full-screen display effects are widely used. The four sides and four corners of the four-curved display screen have curved arcs. During the manufacturing process, especially at the connection between two adjacent curved surfaces, that is, the materials at the four corners are easily squeezed to produce stress that cannot be released, resulting in wrinkles, which affects the display effect of the display screen. Summary of the invention

[0003] The present application provides a display module and an electronic device, which can reduce the generation of wrinkles on the curved portion of a display screen when preparing a curved display screen.

[0004] In a first aspect, the present application provides a display module, comprising a surface layer, a first connecting layer and a display panel which are stacked together, the display module comprising a non-bending portion and a bending portion, the bending portion comprising a first bending portion, and the thickness of the first connecting layer in the first bending portion gradually decreases.

[0005] The display module provided by the present application, when the display module is bent, the first connection layer will be squeezed and extended in the direction of the outer edge, and in the first bent portion, the thickness of the first connection layer will gradually decrease along the first direction, which can reduce the bending depth of the display panel while keeping the surface shape of the surface layer unchanged, further reducing the wrinkles generated by the display panel. The display panel and the surface layer are connected by the first connection layer, so as to prevent the occurrence of voids and uneven stress, and improve the stability of the overall structure of the display module.

[0006] In a possible implementation, the arc length of the first connection layer in the first curved portion is smaller than the arc length of the display panel in the first curved portion. In the first curved portion, the arc length of the first connection layer is smaller than the arc length of the display panel, and the edge of the first connection layer is located on the first direction side of the edge of the display panel, which relieves the extrusion stress of the first connection layer on the display panel, can reduce the amount of the second connection layer between the inner surface layer of the first curved portion and the display panel, and relieves the extrusion stress of the first connection layer on the display panel during bending preparation, thereby reducing wrinkles on the display panel due to extrusion.

[0007] In a 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 in the range of 80% to 96%. By limiting the ratio of the shortened arc length of the first connection layer to the display panel, while ensuring the bonding performance of the first connection layer, the possibility of wrinkles on the display panel in the first curved portion due to extrusion can be reduced, the curved display effect is optimized, and the display requirements of the curved display screen are better met, which helps to improve the quality and performance of the display module and provide users with a better viewing experience.

[0008] In a 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 has a large amount of lateral extrusion during preparation, and by providing a gradually decreasing second connection layer, wrinkles that occur during the bending preparation of the corner region can be alleviated.

[0009] 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.

[0010] During the display screen processing, the edge of the first connection layer and the edge of the display panel are flush in the thickness direction. When the first connection layer, polarizing layer, display panel and back film are cut along the cutting line, the excess polarizing layer, display panel, back film and first release film can be adhered together through the first connection layer, which is convenient for being discharged together after cutting, thereby improving the processing efficiency. The various layers of materials are adhered together through the first connection layer, making it easier to remove the waste parts after cutting, reducing the residues in the processing process, and being conducive to improving the processing accuracy and product quality.

[0011] 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.

[0012] 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 gradually decreases. In the second curved portion of the side region, the curved depth of the display panel can be reduced while the surface shape of the surface layer remains unchanged, and wrinkles on the display panel in the second curved portion can be reduced.

[0013] In a possible implementation, the arc length of the first connection layer in the second curved portion is smaller than the arc length of the display panel in the second curved portion. The edge of the first connection layer is located on the first direction side of the edge of the display panel, which relieves the extrusion stress of the first connection layer on the display panel, can reduce the amount of the second connection layer between the inner surface layer of the second curved portion and the display panel, and relieves the extrusion stress of the first connection layer on the display panel during bending preparation, thereby reducing wrinkles on the display panel due to extrusion.

[0014] In a 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 in the range of 80% to 96%. By limiting the ratio of the shortened arc length of the first connection layer to the display panel, while ensuring the bonding performance of the first connection layer, the possibility of wrinkles on the display panel in the second curved portion due to extrusion can be reduced, the curved display effect is optimized, and the display requirements of the curved display screen are better met, which helps to improve the quality and performance of the display module and provide users with a better viewing experience.

[0015] In a 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 to have wrinkles at the position where the protrusion is located, so that corresponding measures can be taken to eliminate the display problems caused by the wrinkles.

[0016] In a possible implementation, the number of the protrusions is at least two, and the at least two protrusions are arranged at intervals along the extension direction of the edge of the first connection layer. The multiple protrusions on the edge of the first connection layer can provide a buffer for the stress in the stress concentration area of ​​the first curved portion of the display module, release a part of the stress through the deformation of the multiple protrusions, and then disperse the large wrinkles formed in the stress concentration area into multiple small wrinkles, thereby reducing the appearance of wrinkles at the first curved portion of the display module.

[0017] In a possible implementation, the edge of the protrusion and the edge of the non-protruding portion of the first connection layer are connected by a smooth transition. During the bending process, the connection between the protrusion and the first connection layer is a curve, and the curve is used for a smooth transition, avoiding a sharp turn, and making the deformation distribution between the protrusion and the first connection layer more uniform. The local stress concentration area is released through the highest point of the protrusion, thereby reducing the concentration and mutation of stress.

[0018] In a possible implementation, the edge of the protrusion is polygonal or curved. The edge of the protrusion is in a smoothly transitioned curve. During the bending process, the protrusion in a smoothly transitioned curve can provide more surface area, thereby more effectively dispersing pressure. In addition, the smooth edge of the protrusion can reduce the risk of the protrusion causing cracks or damage to other structures of the display module.

[0019] The raised edge is polygonal, which can reduce the redundancy of the first connection layer when it is bent from the side of the plane state to form a curved surface state, so as to minimize the occurrence of wrinkles, reduce the degree of wrinkles, and improve display quality.

[0020] In a possible implementation, the display module further includes at least one of a polarizing layer, a back film and a support member, and in 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 in the area covered by the hole structure along the thickness direction. The first thinning structure is used to reduce the stress and strain in the stress concentration area where the display panel in the first curved portion is prone to wrinkles. By providing a hole structure, the deformation of the hole structure is used to absorb the larger stress and strain generated during the bending process 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 in the first curved portion.

[0021] In a possible implementation manner, the hole structure includes at least one of a through hole and a blind hole.

[0022] A blind hole refers to a hole whose depth is less than the thickness of the thinning layer, and the depth of the hole is the depth of the blind hole along the thickness direction of the thinning layer. Taking the thinning layer as a two-layer support layer structure of a support member and a back film as an example, a hole can be opened on the surface of the support member away from the back film, and the perforation does not pass through the support member to form a blind hole structure on the thinning layer. The thinning layer with a blind hole structure can not only release the stress generated during extrusion and avoid wrinkles in the first curved portion, but also has a reliable fixed connection with the display module.

[0023] The through hole refers to a hole that penetrates the thinning layer. For example, if the thinning layer includes a polarizing layer, the through hole can penetrate the polarizing layer. The through hole can release the stress generated during squeezing to a greater extent, making it easier for the display panel to fit in the first curved portion and reducing the generation of wrinkles.

[0024] In a 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 opening shape of the hole structure can be various and can be designed according to actual needs, so that the stress and strain generated during the bending process of the display module can be absorbed by the deformation of the hole structure, thereby preventing the display module from wrinkling in the first bending portion.

[0025] In a second aspect, the present application provides an electronic device, comprising the display module described in any one of the above items, and further comprising a housing, wherein the housing is fixedly connected to the outer edge of the display module. The housing is used to fix and support the display module, and can prevent external impurities such as water vapor and dust from affecting the performance of the display module.

[0026] The electronic device provided in the present application has a display module as described in any of the above items, in the first curved portion of the electronic device display module, the edge of the first connection layer is located on the first direction side of the edge of the display panel, the thickness of the first connection layer gradually decreases along the first direction, and the first connection 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. In the first curved portion, by locating the edge of the first connection layer on the first direction side of the edge of the display panel, the thickness of the first connection layer gradually decreases along the first direction, and the first connection 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 connection layer on the display panel can be relieved, and the wrinkles of the display panel due to extrusion can be reduced. The electronic device with this display module is not prone to wrinkles at the corners and has a better display effect.

[0027] In the third aspect, the present application also provides a method for preparing a hole structure of 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 opening process of the screen lamination is implemented to form a display panel with a hole structure and a partial display module of the back film.

[0028] 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

[0029] Figure 1 is a schematic diagram of an electronic device provided by an embodiment of the present application;

[0030] Figure 2 is a front view of an electronic device provided by an embodiment of the present application;

[0031] Figure 3 is a schematic diagram of a 2.5D and 3D curved display screen provided in an embodiment of the present application;

[0032] Figure 4 is a schematic diagram of a four-curved display screen provided in an embodiment of the present application;

[0033] Figure 5is a schematic diagram of a curved smartwatch provided in an embodiment of the present application;

[0034] Figure 6 It is an exploded schematic diagram of the surface layer, screen stack and shell provided in the embodiment of the present application;

[0035] Figure 7 It is a schematic diagram of the assembly of the surface layer, screen stack and shell provided in the embodiment of the present application;

[0036] Figure 8 is a schematic diagram of the stacking of a display screen provided in an embodiment of the present application;

[0037] Fig. 9 is a schematic diagram of a partial stacking structure of a first curved portion of a display module provided in an embodiment of the present application;

[0038] Fig.10 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;

[0039] Fig.11 This is a schematic diagram of the structure in which the first connection layer provided by the embodiment of the present application is retracted at four corners;

[0040] Fig.12 is a partial stacking diagram of a display module including a second curved portion provided in an embodiment of the present application;

[0041] Fig.13 is a schematic diagram of cutting edges during preparation of a display module provided in an embodiment of the present application;

[0042] Fig.14 This is a schematic diagram of a structure in which the first connection layer provided by an embodiment of the present application is retracted at four corners and four sides;

[0043] Fig.15 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;

[0044] Fig.16 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;

[0045] Fig.17 It is a schematic diagram of a raised edge as a curve provided in an embodiment of the present application;

[0046] Fig.18 It is a schematic diagram of redundancy definition provided in an embodiment of the present application;

[0047] Fig.19 It is a schematic diagram of a raised edge as a polygon provided in an embodiment of the present application;

[0048] Fig. 20It is a schematic diagram of the hole structure provided in the embodiment of the present application;

[0049] Fig.21 The hole structure provided in the embodiment of the present application is provided with a long strip-shaped opening. Figure 1 ;

[0050] Fig. 22 The hole structure provided in the embodiment of the present application is provided with a long strip-shaped opening. Figure 2 ;

[0051] Fig.23 This is a schematic diagram of an elliptical opening of a hole structure provided in an embodiment of the present application;

[0052] Fig.24 This is a schematic diagram of an elliptical opening of a hole structure provided in an embodiment of the present application;

[0053] Fig.25 This is a schematic diagram of a circular opening of a hole structure provided in an embodiment of the present application;

[0054] Fig.26 This is a schematic diagram of a hole structure opening provided in an embodiment of the present application being a rounded rectangle;

[0055] Fig. 27 This is a schematic diagram of a wavy opening of the hole structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0057] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0058] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" 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 other meanings.

[0059] It should be understood that the term "and / or" used in this article is only a description of the same field of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0060] The word "if" as used herein may be interpreted as "when" 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 determining" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0061] It should be understood that the terms “first”, “second”, etc. used in the present application are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0062] In the description of the present application, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0063] When used in this application, “within the range of…”, unless it is separately specified that an 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.

[0064] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, a conflicting connection or an integral connection; wherein the connection can be a direct connection or an indirect connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] In recent years, the display panel manufacturing technology of electronic devices has developed rapidly, among which bendable flexible screens are widely used as curved screens in electronic devices. At present, four-curved display screens with better full-screen display effects are widely used. The four sides and four corners of the four-curved display screen have curved arcs. During the production process, especially at the connection between two adjacent curved surfaces, that is, the materials at the four corners are easily squeezed to produce stress that cannot be released, resulting in wrinkles, which affects the display effect of the display screen.

[0066] The present application provides an electronic device 100. Figure 1 and attached Figure 2The electronic device 100 may include, but is not limited to, a mobile phone, a tablet computer, a laptop computer, a super mobile personal computer, a handheld computer, a walkie-talkie, an Internet TV, a wearable device, a vehicle-mounted device, a driving recorder, and a security device, etc., which have a display interface. The embodiment of the present application does not impose any special restrictions on the form of the electronic device 100.

[0067] For example, see Figure 1 In the implementation manner of the present application, the electronic device 100 is described by taking a curved screen mobile phone as an example. Figure 1 Schematic diagram of an electronic device 100 provided in an embodiment of the present application. Figure 2 This is a front view of an 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 can be a split structure or an integrated structure, which is not specifically limited in this embodiment.

[0068] The display screen 10 is mounted on the housing 20, wherein the housing 20 has a housing cavity, and components such as circuit boards, electronic components, camera modules, processors and batteries 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, and the components in the housing cavity are protected 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.

[0069] In some possible implementations, the display screen 10 may be a four-curved screen, such as Figure 1 and Figure 2 As shown, the side edges of the display screen 10 in the X direction, the X reverse direction, the Z direction and the Z reverse direction are all bent toward the Y reverse direction, and the four corners of the display screen 10 are also bent toward the Y reverse direction to form a four-curved display screen 10 with curved edges. The application does not specifically limit the length of the side bends in the display screen 10. In one embodiment, the display module 11 can also be a dual-curved screen (not shown in the figure), and the dual-curved screen can refer to Figure 1 Only the two side edges of the display module 11 in the X direction and the opposite direction of the X direction are bent toward the side of the opposite direction of the Y direction, and the two side edges in the Z direction and the opposite direction of the Z direction are not bent.

[0070] The curved screen may be a 2.5D curved screen or a 3D curved screen. Figure 3 As shown, the edges of the display screen in the X direction and the opposite direction of the X direction in the 2.5D curved screen are curved only on one side in the Y direction, and are flat on the side in the opposite direction of the Y direction. In the 2.5D screen, only the outer edge of the surface layer (which can be a glass cover) can be made into a curved surface, while the inner side of the surface layer is flat. Under this structure, the polarizing layer, display panel, back film and other layers can be flat structures. Figure 3 As shown, the edges of the display screen in the 3D curved screen on both sides of the X direction and the opposite X direction are bent toward the side of the opposite Y direction, the outer surface on the side of the Y direction is a protruding curved surface, and the inner surface on the side of the opposite Y direction is a concave curved surface.

[0071] In one embodiment, Figure 4 Take the four-curved screen mobile phone shown in as an example, Figure 4 The display screen 10 in the embodiment may include a curved portion 101 and a non-curved portion 102. The curved portion 101 may be a curved portion in the display screen 10. Figure 4 The side area of ​​the non-bending portion 102 described in Figure 4 As shown, the non-bending portion 102 of the electronic device may be a planar display portion, and the curved portion 101 may be located around the non-bending 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-bending 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-bending portion 102 may not be specifically limited, and may be specifically designed according to the requirements of the electronic device.

[0072] In some possible embodiments, see Figure 5 As shown, Figure 5 A schematic diagram of a dial of a smart watch is shown. The dial 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 .

[0073] The present application provides a display screen 10, which can be applied to the electronic devices in the above-mentioned embodiments, for example Figure 1 The four-curved screen mobile phone shown, Figure 5 The smart watch with a curved outer surface as shown, and electronic devices with curved sides such as a dual-curved screen. This application embodiment takes a four-curved screen mobile phone as an example, see Figure 6 , Figure 7 and Figure 8 As shown, 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. Figure 8 As shown, the support member 12 may include a third connection layer 121 and a support back plate 122. The support back plate 122 may be a film plate made of copper foil. The third connection layer 121 is fixed to the support back plate 122 and the back film 115. The support back plate 122 may be a copper foil to improve the support and anti-bending properties of the display screen. The support back plate 122 has a certain structural strength to meet the support strength requirements of the display module 11.

[0074] See also Figure 8 As shown, 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 in sequence along the Y direction. The surface layer 111 may be a glass cover plate, and the glass cover plate 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), which can connect the surface layer 111 and the polarizing layer 113 to form an integral structure, and facilitate the light emitted by the display panel 114 to pass through for display. The first connection layer 112, the polarizing layer 113, the display panel 114 and the back film 115 constitute a screen laminate 11a, which is located inside the surface layer 111. The surface layer 111 can protect the screen laminate 11a, prevent the screen laminate 11a from entering water, dust and other debris, and prevent the screen laminate 11a from being squeezed and damaged. The side edge of the surface layer 111 can be connected to the housing 20, for example, the screen laminate 11a is located in a cavity enclosed by the surface layer 111 and the housing 20.

[0075] The polarizing layer 113 may be a polarizing film (Polarizer, POL), which is 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 be used as a display unit to emit light 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 arranged on one side of the display panel 114, and 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.

[0076] In one embodiment, the surface layer 111 can be located on the display surface side of the display module 11, so that 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 the 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. The present 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. At present, in the preparation of display panels such as Figure 4 and Figure 5 In the case of the display screen 10 with curved sides shown, a flat plate 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 can be prepared first, and then the area to be bent can be heated and a certain extrusion force can be applied, so that each stack of the display screen 10 is bent at the curved portion 101 to form a curved screen. However, during the bending process, a certain extrusion force can be applied to the outside of the surface layer 111 to bend, and when the surface layer 111 is bent, an extrusion force will be applied to the polarizing layer 113 and the display panel 114 through the first connecting layer 112. Under the extrusion of the surface layer 111, the other layers in the display module 11 are transformed from a flat surface to a curved surface, especially at the four sides of the display module 11 and the intersecting corners, where extrusion stress is generated, which is easy to produce wrinkles. The wrinkles will cause structural bad points to appear in the display module 11 during the packaging process, affecting the display effect of the display screen 10.

[0077] 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.

[0078] The present application embodiment provides a display module 11, see Fig. 9 and Fig.10 As shown, Fig. 9 shows a schematic diagram of a partial laminated structure of a first curved portion of a display module, Fig.10 The schematic diagram of the stacked structure of the first curved portion of a display module 11 is shown. The curved portion 101 includes a first curved portion 101a, and the first curved portion 101a may include Fig.11 The corner areas shown may also include Figure 5The entire curved portion shown, etc., and the area where wrinkles may appear during the bending preparation, can all be the first curved portion defined in the embodiments of the present application. In the first curved portion 101a, a surface layer 111, a first connecting layer 112, a polarizing layer 113 and a display panel 114 are stacked along the Y direction. In the first curved portion 101a: the thickness of at least part of the area of ​​the first connecting layer 112 gradually decreases, and the thickness of the first connecting layer 112 can gradually decrease from the center to the edge of the display screen. Among them, in the first curved portion 101a, the first connecting layer 112 presents an overall 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 can gradually decrease in the entire first curved portion 101a, or only in a part of the first curved portion 101a, the thickness can be gradually reduced.

[0079] See also Fig.10 As shown, after the display module 11 is bent, in the first bent portion, the thickness of the first connection layer 112 gradually decreases along the direction from the center to the edge of the display screen. For example, the thickness W1 of the first connection layer 112 on the side close to the center of the display screen is greater than the thickness W2 of the first connection layer 112 on the side close to the edge of the display layer. The thickness of the first connection layer 112 located in the first bent portion gradually decreases along the direction from the center to the edge of the display screen, so that the first connection layer 112 located in the first bent portion 101a has a structure that is thin outside and thick inside. When the display module 11 is bent, the influence of the extrusion force on the display panel 114 can be reduced (the closer to the edge position, the greater the degree of bending), the display panel 114 is prevented from being damaged by a large extrusion force, and the bending depth of the display panel 114 is reduced while the surface shape of the surface layer 111 remains unchanged.

[0080] 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, and maintain the flatness of the surface of the first connection layer 112 after bending. At the same time, the gradually decreasing thickness can reduce the squeezing force of the first connection layer 112 on the display panel 114, and reduce the bending depth of the display panel 114 under the premise that the surface shape of the surface layer 111 remains unchanged, reduce the possibility of wrinkles or other damage to the display panel 114 due to the compression redundancy of the display module 11 at the bent part, and improve the reliability and service life of the display module 11.

[0081] The first connecting layer 112 can be respectively 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 avoiding movement and deformation of the first connecting layer 112 caused by uneven stress, thereby improving the stability of the overall structure of the display module 11.

[0082] In the display module 11 provided in the embodiment of the present application, when the display module 11 is bent, the first connection layer 112 is squeezed and extended toward the outer edge. Fig. 9 and Fig.10 As shown, the arc length of the first connection layer 112 in the first curved portion 101a is smaller than the arc length of the display panel 114 in the first curved portion 101a. Fig. 9 As shown, in the first curved portion 101a, each stacked structure of the display module 11 is curved, and each stack extends in an arc shape from the center to the edge of the display screen, and the length in the extension direction (curve extension direction) is the arc length. Fig.10 As shown, the projection of the edge of the first connection layer 112 in the first bent portion on the display panel 114 along the stacking direction (see FIG. Fig.10 The arrow on the side of the first connection layer 112 in the opposite direction of Y is at the pointing position of the display panel 114), which is located on the side of the edge of the display panel 114 facing the non-bending portion 102, and 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 bending portion, and Fig.10 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 inner surface layer 111 and the display panel 114 of the curved portion 101, and relieve the extrusion stress of the first connection layer 112 on the display panel 114 during bending preparation, thereby reducing the wrinkles caused by the extrusion of the display panel 114. In the first curved portion 101a, the thickness of the first connection layer 112 can be gradually reduced from the center to the edge of the display screen, which can reduce the bending depth of the display panel 114 while keeping the surface shape of the surface layer 111 unchanged, further reducing the wrinkles generated by the display panel 114. The polarizing layer 113 and the surface layer 111 are connected by the first connection layer 112 to prevent the occurrence of voids and stress imbalance, thereby improving the stability of the overall structure of the display module 11.

[0083] In one possible implementation, see Fig. 9As shown, 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 the range of 80% to 96%. In the direction from the center to the edge of the display screen, the arc length of the edge of the first connection layer 112 from the edge of the display panel 114 is in the range of 4% to 20%. Specifically, see Fig. 9 As shown, Fig. 9 A schematic diagram of a partial stacked structure of a display module provided in an embodiment of the present application. Fig. 9 In the curved portion 101 on one side, the arc length of the display panel 114 in the first curved portion 101a is L1, the arc length of the first connection layer 112 in the first curved portion 101a is L2, and the ratio of the arc length L2 to the arc length L1 is in the range of 80% to 96%; the arc length of the edge of the first connection layer 112 and the edge of the display panel 114 is L3, and the arc length L3 can be the difference between the arc length L1 and the arc length L2. The ratio of the arc length L3 to the arc length L1 is in the range of 4% to 20%. The difference in arc length between the edge of the first connection 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 curved portion, and ensuring the bonding performance of the first connection 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.

[0084] In some possible implementations, see Fig.11 As shown, Fig.11 A schematic diagram of a structure in which the four corners of a first connection layer are retracted provided in an embodiment of the present application, 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. Fig.11 (not shown). 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 may include curved portions of four straight sides of the display screen. The first curved portion 101a may include a 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 similar to Figure 5In the case of the circular display screen of the watch dial shown, the curved portion of the display screen only has the first curved portion, but does not have the second curved portion. The display screen described in this embodiment can be applied to electronic devices of quadrilateral or other polygonal shapes such as mobile phones, tablets and laptops.

[0085] The display module 11 has a first curved portion 101a in the corner region. The corner region of the display module 11 is the location where two adjacent sides of the display module 11 are connected. Fig. 9 and Fig.10 The edge of the first connection layer 112 is located on the inner side of the edge of the display panel 114, and the thickness of the first connection layer 112 can gradually decrease from the center to the edge of the display screen.

[0086] During the bending process of the display module 11, the surface layer 111 will squeeze the first connection layer 112 in the horizontal direction (consistent with the extension surface of the first connection layer 112), so that the first connection layer 112 will produce wrinkles in the thickness direction, thereby causing wrinkles in the display panel 114 when squeezing the display panel 114, and such wrinkles are particularly obvious in the first curved portion 101a. In 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 smaller than the arc length of the display panel 114, the edge of the first connection layer 112 is located on the inner side of the edge of the display panel 114, and the thickness of the first connection layer 112 can be gradually reduced from the center to the edge of the display screen, so that the squeezing stress of the first connection layer 112 on the display panel 114 in the first curved portion 101a of the corner area when the display panel 114 is bent is reduced, 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.

[0087] In one possible implementation, see Fig.11 As shown, the display module 11 has a second curved portion 101b at the side position, and the second curved portion 101b can be located between two adjacent first curved portions 101a. The second curved portion 101b can be four straight side curved portions of the display screen 10. The area where the second curved portions 101b located at the intersection of the two adjacent sides of the display screen 10 is the first curved portion 101a. The first curved portion 101a and the second curved portion 101b are bent and extended toward the non-display side of the display panel 114, so that the display screen 10 presents a curved surface structure.

[0088] See also Fig.11 and Fig.12 As shown, Fig.12The schematic diagram of the partial stacking of the display module including the second curved portion is shown. In the second curved portion 101b, the thickness of the first connection layer 112 can be evenly distributed along the direction from the center to the edge of the display screen, and the thickness of the first connection layer 112 is equal at any position along the direction from the center to the edge of the display screen. The first connection layer 112 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 connection layer 112 is bonded and connected to the lower surface of the surface layer 111, and the lower surface of the first connection layer 112 is bonded and connected to the upper surface of the polarizing layer 113, so that the first connection layer 112 can be closely bonded to the surface layer 111 and the polarizing layer 113, avoiding the movement and deformation of the first connection layer 112 caused by the stress imbalance, and improving the stability of the overall structure of the display module 11.

[0089] In one embodiment, the edge of the first connection layer 112 is flush with the edge of the display panel 114 in the thickness direction. The projections of the edge of the first connection layer 112 and the edge of the display panel 114 in the thickness direction overlap.

[0090] 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 size prepared in advance is larger than the size of the display screen applied to the electronic device, and the target size is prepared by cutting the edge of the flat display screen. In the embodiment of the present application, the first connection layer 112 is flush with the upper and lower layers at the edge of the second curved portion 101b. Fig.13 As shown, along Fig.13 The dashed line shown cuts off the edge ( Fig.13 The left part of the middle dotted line) is removed as a whole, which can prevent the cut edge from being scattered into multiple small parts and pasted on Fig.13 On the display layer on the right side of the middle dotted line, the subsequent preparation and normal use of the display screen are ensured, and the complexity of the preparation process of the display screen is reduced.

[0091] See also Fig.13As shown, a release film 1121 can also be provided on the upper surface of the first connection layer 112, and the release film 1121 can be fixedly connected to the surface layer 111 and the first connection layer 112. During the display screen processing, in the prepared flat large-size display screen, the edge of the first connection layer 112 and the edge of the display panel 114 are flush along the thickness direction, or the edge of the first connection layer 112 can be located on one side of the display panel 114 along the center to edge direction of the display screen. When the first connection layer 112, the polarizing layer 113, the display panel 114 and the back film 115 are cut along the cutting line, the excess polarizing layer 113, the display panel 114, the back film 115 and the first release film 1121 can be adhered together through the first connection layer 112, so that they can be discharged together after cutting, thereby improving the processing efficiency. The various layers of materials are adhered together through the first connection layer 112, so that the waste parts after cutting are easier to remove, and the residues in the processing process are reduced, which is conducive to improving the processing accuracy and product quality.

[0092] In one possible implementation, see Fig.14 As shown, Fig.14 The first connection layer provided in the embodiment of the present application is provided with a structural schematic diagram in which the four corners and four sides are all retracted. In the first curved portion 101a and the second curved portion 101b, the edge of the first connection layer 112 is 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. Fig. 9 and Fig.10 As shown, in the first curved portion 101a: the thickness of at least a part of the first connection layer 112 gradually decreases, and the thickness of the first connection layer 112 can gradually decrease along the direction from the center to the edge of the display screen. In the first curved portion 101a, the first connection layer 112 is an overall 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 connection layer 112 can gradually decrease in the entire first curved portion 101a, or only in a part of the first curved portion 101a. Fig.15 and Fig.16As shown, in the second curved portion 101b, the thickness of at least a part of the first connection layer 112 gradually decreases, and the thickness of the first connection layer 112 can gradually decrease along the direction from the center to the edge of the display screen. In the second curved portion 101b, the first connection layer 112 presents an overall curved structure in the direction from the center to the edge of the display screen, and in the entire curved region, the thickness of the first connection layer 112 can gradually decrease in the entire second curved portion 101b, or only in a part of the second curved portion 101b, the thickness can be gradually reduced. The first connecting layer 112 in the first curved portion 101a and the second curved portion 101b are 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, avoiding the movement and deformation of the first connecting layer 112 caused by stress imbalance, thereby improving the stability of the overall structure of the display module 11.

[0093] See also Fig.14 As shown, the first connection layer 112 has an inwardly contracted 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. The thickness of the first connection layer 112 may gradually decrease along the direction from the center to the edge of the display screen. Fig.16 As shown, after the display module 11 is bent, in the second curved portion 101b, the thickness of the first connection layer 112 gradually decreases along the direction from the center to the edge of the display screen. For example, the thickness W3 of the first connection layer 112 on the side close to the center of the display screen is greater than the thickness W4 of the first connection layer 112 on the side close to the edge of the display layer. The thickness of the first connection layer 112 located in the second curved portion gradually decreases along the direction from the center to the edge of the display screen, so that the first connection layer 112 located in the second curved portion 101b has a structure that is thin outside and thick inside. When the display module 11 is bent, the influence of the extrusion force on the display panel 114 can be reduced (the closer to the edge position, the greater the degree of bending), the display panel 114 is prevented from being damaged by a large extrusion force, and the bending depth of the display panel 114 is reduced while the surface shape of the surface layer 111 remains unchanged. The display screen is bent in the entire curved portion, and the second connection layer of the curved portion presents an inward-shrinking structure to prevent the second connection layer from being squeezed to a certain extent and wrinkled when the display screen is bent to prepare the curved portion, thereby improving the display quality of the display panel in the display screen.

[0094] In one embodiment, only the first connection layer 112 in the second curved portion 101b may be retracted, and 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, and the thickness of the first connection layer 112 at any position along the direction from the center to the edge of the display screen is equal, and the edge of the first connection layer 112 in the first curved portion 101a is flush with the edge of the display panel 114 in the thickness direction, so as to prevent wrinkles from occurring during the preparation of the second curved portion 101b.

[0095] In one embodiment, when the display module 11 is bent, the first connection layer 112 is squeezed and extended toward the outer edge. Fig.15 and Fig.16 As shown, the arc length of the first connection layer 112 in the second curved portion 101b is smaller than the arc length of the display panel 114 in the second curved portion 101b. Fig.15 As shown, in the second curved portion 101b, each stacked structure of the display module 11 is curved, and each stack extends in an arc shape from the center to the edge of the display screen, and the length in the extension direction (curve extension direction) is the arc length. Fig.16 As shown, the projection of the edge of the first connection layer 112 in the second bent portion 101b on the display panel 114 along the stacking direction (see FIG. Fig.16 The arrow on the side of the first connection layer 112 in the opposite direction of Y is at the pointing position of the display panel 114), located on the side of the edge of the display panel 114 facing the non-bending portion 102, and 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 bending portion 101b, and Fig.16The 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 101b, and relieve the extrusion stress of the first connection layer 112 on the display panel 114 during bending preparation, thereby reducing the wrinkles caused by the extrusion of the display panel 114. In the second curved portion 101b, the thickness of the first connection layer 112 can be gradually reduced from the center to the edge of the display screen, which can reduce the bending depth of the display panel 114 while keeping the surface shape of the surface layer 111 unchanged, further reducing the wrinkles generated by the display panel 114. The polarizing layer 113 and the surface layer 111 are connected by the first connection layer 112 to prevent the occurrence of voids and stress imbalance, thereby improving the stability of the overall structure of the display module 11.

[0096] In one possible implementation, see Fig.15 As shown, 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 the range of 80% to 96%. In the direction from the center to the edge of the display screen, the ratio of the arc length of the edge of the first connection layer 112 to the arc length of the display panel 114 is in the range of 4% to 20%. Specifically, see Fig.15 As shown, Fig.15 A schematic diagram of a partial stacked structure of a display module provided in an embodiment of the present application. Fig.15 In the curved portion 101 on one side, the arc length of the display panel 114 in the second curved portion 101b is L4, the arc length of the first connection layer 112 in the second curved portion 101b is L5, and the ratio of the arc length L5 to the arc length L4 is in the range of 80% to 96%; the arc length of the edge of the first connection layer 112 from the edge of the display panel 114 is L6, and the arc length L6 can be the difference between the arc length L4 and the arc length L6. The ratio of the arc length L6 to the arc length L4 is in the range of 4% to 20%. The difference in arc length between the edge of the first connection 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 connection 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.

[0097] In some possible implementations, see Fig.17As shown, at least two protrusions 1122 are provided on the edge of the first connection layer 112, and the protrusions 1122 protrude from the outside of the edge of the first connection layer 112 along the direction from the center to the edge of the display screen. At least two protrusions 1122 are arranged at intervals along the extension direction of the edge of the first connection layer 112, and the interval distance between two adjacent protrusions 1122 is not limited here. Each protrusion 1122 protrudes to the outside of the first connection layer 112 along the direction from the center to the edge of the display screen. The protruding directions of each protrusion 1122 may be parallel to each other or non-parallel, and each protrusion 1122 can be set independently of each other. Among them, the protrusion 1122 is set in the area where the first connection layer 112 is retracted relative to the display panel 114, which can be in the first curved part or in the second curved part. The embodiment of the present application is described by taking the first curved part as an example.

[0098] The plurality of protrusions 1122 on the edge of the first connection layer 112 can provide a buffer for the stress of the display module 11 in the stress concentration area of ​​the first curved portion 101a. Fig.17 The deformation in the direction indicated by the middle arrow releases part of the stress, thereby dispersing the large wrinkles formed in the stress concentration area into multiple small wrinkles, thereby reducing the appearance of wrinkles at the first curved portion 101a of the display module 11.

[0099] Among them, see Fig.17 As shown, a plurality of protrusions 1122 are provided on the edge of the first connection layer 112, and recessed portions 1123 are formed between the plurality of protrusions 1122. The provision of the protrusions 1122 can effectively reduce the degree of wrinkles on the first connection layer 112 after bending, mainly by reducing the redundancy of the first connection layer 112 after bending from a flat surface to a curved surface. The redundancy can be the compression ratio of the arc length in the flattened state to the arc length in the curved surface state. Fig.18 As shown, Fig.18 The first connection layer 112 of the upper middle layer is planar, and the first connection layer 112 of the lower layer is a schematic diagram of a curved surface formed by bending the planar surface under the pressure of the surface layer. After bending downward, the edge arc length L7 of the upper planar first connection layer 112 will compress a certain proportion of the edge arc length L8 of the lower curved surface first connection layer 112, and the arc length L8 is smaller than the arc length L7. The amount of compression of arc length L8 compared to arc length L7 is 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 in the compressed part. The present application sets a protrusion 1122, and when the edge of the planar first connection layer 112 is bent, refer to Fig.18 As shown in the enlarged view in FIG. 1 , the bottom sides of the protrusion 1122 are stretched to the left and right sides ( Fig.18The dotted line at the bottom of the middle protrusion 1122 is a schematic diagram in a plane 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, thereby reducing or even eliminating the generation of wrinkles.

[0100] In one embodiment, see Fig.17 As shown, in the first curved portion 101a, a plurality of protrusions 1122 are provided on the edge of the first connection layer 112, and the edge of the protrusion 1122 is a partial edge of the first connection layer 112. The edge of the protrusion 1122 can be smoothly transitioned and connected with the other edges of the edge of the first connection layer 112, so that transition can be achieved between adjacent protrusions 1122. The edge of the protrusion 1122 can refer to the edge 1122a of the protruding portion of the protrusion 1122 toward the first connection layer 112 in the direction from the center to the edge of the display screen, and the other edges of the edge of the first connection layer 112 can refer to the edge 1122b where the non-protruding portion of the first connection layer 112 is connected to the protrusion 1122. Fig.17 The edge 1122a of the protrusion 1122 and the other edge 1122b of the first connection layer 112 are both smoothly transitioned curves. In the bending preparation process, the connection between the protrusion 1122 and the non-protruding portion of the first connection layer 112 is a curve, and the curve is used for smooth transition, avoiding a sharp turn, and making the deformation distribution between the protrusion 1122 and the first connection layer 112 more uniform. The protrusion 1122 in the shape of a smooth transition curve can reduce the risk of the protrusion 1122 causing rupture or damage to other structures in the display module 11.

[0101] In one embodiment, see Fig.19 As shown, in the first curved portion 101a, a plurality of protrusions 1122 are provided on the edge of the first connection layer 112, and the edge of the protrusion 1122 is a partial edge of the first connection layer 112. The edge of the protrusion 1122 can be smoothly connected with the other partial edges of the edge of the first connection layer 112, so that the adjacent plurality of protrusions 1122 can be transitioned. The edge of the protrusion 1122 can be polygonal, that is, Fig.19 The edge 1122a of the protrusion 1122 shown in the figure is polygonal, and the other edge 1122b of the edge of the first connection layer 112 is in a smoothly transitioned curve, so that the adjacent protrusions are similar to radial protrusions.

[0102] In one embodiment, see Fig.19As shown, in the first curved portion 101a, a plurality of protrusions 1122 are provided on the edge of the first connection layer 112, and the edge of the protrusion 1122 is a partial edge of the first connection layer 112. The edge of the protrusion 1122 can be smoothly connected with the other partial edges of the edge of the first connection layer 112, so that the adjacent plurality of protrusions 1122 can be transitioned. The edge of the protrusion 1122 can be polygonal, that is, Fig.19 The edge 1122a of the protrusion 1122 shown in the figure is polygonal in shape, and the other edge 1122b of the edge of the first connection layer 112 is polygonal in shape.

[0103] It can be understood that, in the second curved portion 101b, or in both the first curved portion 101a and the second curved portion 101b, a plurality of protrusions 1122 are also provided on the edge of the first connection layer 112, the protrusions 1122 protrude outward from the first connection layer 112 in the direction from the center to the edge of the display screen, and the plurality of protrusions 1122 are arranged at intervals along the extension direction of the edge of the first connection layer 112. The edges of the plurality of protrusions 1122 may be polygonal or may be smoothly transitioned curves. The edge 1122a of the protrusion 1122 and the other edge 1122b of the edge of the first connection layer 112 are smoothly transitioned and connected. In the second curved portion 101b, the specific implementation of the plurality of protrusions 1122 is substantially the same as the implementation of the plurality of protrusions 1122 in the first curved portion 101a, and will not be described in detail here.

[0104] It should be noted that the position, shape and size of the plurality of protrusions 1122 on the edge of the first connection layer 112 are affected by the stress on the display module 11 in the first curved portion 101a and / or the second curved portion 101b. Depending on the magnitude and direction of the stress on the display module 11, the design of the position, shape and size of the plurality of protrusions 1122 on the edge of the first connection layer 112 may also be inconsistent. For example, see Fig.19As shown in the enlarged figure, in the first curved portion 101a display module 11, the greater the height H of the protrusion 1122 along the direction from the center to the edge of the display screen, the greater the degree of stretching of the side walls of the protrusion 1122 to both sides when the first connection layer 112 is bent from a plane to a curved surface, which is more conducive to reducing the redundancy in the bending process, so as to better reduce the wrinkles formed during bending. In addition, multiple protrusions 1122 can be set in each first curved portion 101a, for example, multiple protrusions 1122 can be set in four first curved portions 101a, so that the stress in the area of ​​the first curved portion 101a is released to the maximum extent, reducing the possibility of wrinkles in the first curved portion 101a. Of course, multiple protrusions 1122 can also be set in one of the first curved portions 101a, two of the first curved portions 101a, or three of the first curved portions 101a. Parameters such as positions, shapes, and sizes of the plurality of 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.

[0105] In some possible implementations, see Fig. 20 As shown, the display module 11 also includes a thinning layer, and the thinning layer has a hole structure 131. The thinning layer can 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 in 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, and the polarizing layer 113, the back film 115 and the support member 12 are all provided with a hole structure 131. In one embodiment, the support member 12 may include a third connecting layer 121 and a supporting back plate 122, and the hole structure may be provided only on the third connecting layer 121, or only on the supporting back plate 122, or on both the third connecting layer 121 and the supporting back plate 122. Among them, the hole structure 131 is used to reduce the thickness of the thinning layer in the area covered by the hole structure 131 along the thickness direction. 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 where wrinkles are easily generated. 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.

[0106] In this embodiment, the hole structure 131 is used to reduce the structural strength of the thinning layer at the corresponding position, so that the thinning layer is 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.

[0107] The thinning layer may be only one of the polarizing layer 113, the back film 115 and the support 12, and the hole structure 131 is only arranged on one of the layer structures of the polarizing layer 113, the back film 115 and the support 12. The thinning layer may also be a combination of any two of the polarizing layer 113, the back film 115 and the support 12. The hole structure 131 may be arranged on one or two layer structures of the polarizing layer 113, the back film 115 and the support 12. The thinning layer may also include three layers of the polarizing layer 113, the back film 115 and the support 12 at the same time, and the hole structure 131 may also be arranged in at least one layer structure of the thinning layer. The hole structure 131 may be arranged in the thinning layer by laser, etching, punching and other processes.

[0108] In one embodiment, see Fig. 20 As shown, the thinning layer is a stacked polarizing layer 113, a backing film 115 and a support member 12 as an example. The hole structure 131 can be a blind hole, which refers to a hole whose depth is less than the thickness of the thinning layer. The depth of the hole is the depth of the blind hole along the thickness direction of the thinning layer, for example Fig. 20 The hole structures provided on the middle support member 12 and the back film 115 can be blind holes. In this embodiment, the hole structure 131 is provided only on the support member 12. The opening of the blind hole provided on the support member 12 can be provided on the lower surface away from the back film 115, and the opening of the blind hole provided on the back film 115 can be provided on the upper surface facing the second connection layer 116. The opening direction of the blind hole can be set according to different needs and designs, and the embodiment of the present application is not limited. Fig.21 As shown in the long strip, a plurality of blind holes are arranged at intervals in the curved portion to avoid the connection of adjacent blind holes, which would cause a significant impact on the structure and function of the thinning layer.

[0109] 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 away from the second connection layer 116; during preparation, the second connection layer 116 and the back film 115 can be fixed as an integral structure, and a blind hole can be opened on the upper surface of the back film 115; wherein, the back film 115 can be perforated by laser laser engraving technology, and the perforation does not pass through the back film 115, so as to form a blind hole structure on the thinning layer. The thinning layer provided with the blind hole structure is then fixed in other laminated structures in the display module 11.

[0110] In one embodiment, see Fig. 20 As shown, the hole structure 131 may be a through hole, which refers to a hole that penetrates a layer where the hole structure is located, for example Fig. 20The through holes penetrate the polarizing layer 113. The openings of the through holes are respectively located on the upper surface and the lower surface of the polarizing layer 113. The openings of the through holes can be circular, and multiple through holes are arranged at intervals in the curved portion 101 to avoid the adjacent multiple through holes being connected to each other, thereby causing a significant impact on the structure and function of the thinning layer.

[0111] In one embodiment, in the first curved portion 101a and the second curved portion 101b, the support member 12 and the back film 115 on the non-display surface side of the display panel 114 are both provided with a hole structure 131. The display surface side of the display panel 114 is connected to the surface layer 111 through the first connecting layer 112 to form an integral display module structure. In the first curved portion 101a and the second curved portion 101b, the edge of the first connecting layer 112 is located on the side of the edge of the display panel 114 along the direction from the edge of the display screen to the center.

[0112] In some possible implementations, the opening shape of the hole structure 131 may be rectangular, circular, elliptical, rounded rectangular, waist-shaped, or wavy. Fig.21 and Fig. 22 The hole structure 131 is a schematic diagram showing that the opening is a long strip. Fig.23 and Fig.24 The opening of the hole structure 131 is an elliptical schematic diagram. Fig.25 The hole structure 131 is a schematic diagram showing a circular opening. Fig.26 The opening of the hole structure 131 is a schematic diagram of a rounded rectangle. Fig. 27 The opening of the hole structure 131 is a schematic diagram showing a wave shape.

[0113] In the first curved portion 101a, a plurality of hole structures 131 may be provided, and the layout of the plurality of hole structures 131 in the first curved portion 101a may be various. Fig. 22 , Fig.24 and Fig.26 As shown, the plurality of hole structures 131 are arranged in a divergent shape along the direction from the center to the edge of the display screen, that is, as the plurality of hole structures 131 extend from the center to the edge of the display screen, the intervals between different plurality of hole structures 131 at one end close to the edge of the thinning layer are greater than the intervals between different plurality of hole structures 131 at one end away from the edge of the thinning layer, so as to reduce the stress concentration of the display panel 114 in the first curved portion 101a to a greater extent. For another example, referring to Fig.23 and Fig.25 As shown, a plurality of hole structures 131 are randomly arranged in the first curved portion 101a. Fig.21 and Fig. 27As shown, the extension directions of the plurality of hole structures 131 in 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 according to the extrusion force received during the bending process and use of the display module 11, and this application does not limit this.

[0114] In some embodiments, a hole structure 131 may be provided on the thinned layer in each first curved portion 101a, for example, a hole structure 131 may be provided in each of the four first curved portions 101a. In this way, the stress of the display panel 114 in the first curved portion 101a can be better released, and the probability of wrinkles in the display panel 114 can be reduced to a greater extent. Of course, the hole structure 131 may also be provided in one of the first curved portions 101a, one of the first curved portions 101a, or three of the first curved portions 101a, which is not limited here and can be selected as needed.

[0115] The multiple hole structures 131 described in this embodiment can release the extrusion pressure on the display module 11 by adjusting the ratio 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 on the display module 11 during the bending process and the use process, so as to ensure that the various layers of 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.

[0116] In some other embodiments of the present application, it can be understood that the hole structure 131 on the thinned layer can be set in the second curved portion 101b, and the hole structure 131 can be set on at least one of the polarizing layer 113, the back film 115 and the support layer 12 in the second curved portion 101b. The hole structure can be at least one of a through hole and a blind hole, and the shape and number of the hole structure in the second curved portion 101b are not limited. The method of setting the hole structure 131 in the second curved portion 101b can be consistent with the method of setting the hole structure 131 in the first curved portion 101a, which will not be repeated here.

[0117] The present application also provides a method for preparing a display module hole structure, comprising the following steps:

[0118] Step S100, preparing a large display panel;

[0119] First, a large display panel is prepared, wherein the large panel refers to a display panel before being cut into a target shape and size, and the large display panel may be a touch display panel structure.

[0120] Step S200, laminating a back film on a large display panel to form a composite large panel;

[0121] The back film with a certain supporting strength is attached to the large display panel to form a composite large panel.

[0122] Step S300, preparing a hole structure on the back film of the composite large board;

[0123] A hole structure is prepared on the formed composite large plate of the stacked structure. The hole structure can be a blind hole on the back film or a through hole on the back film.

[0124] Step S400: cutting the composite large board into a plurality of composite small boards.

[0125] The composite large plate with hole structure is cut to realize the local opening process of the screen lamination to form a display panel with hole structure and a partial display module of the back film. The shape of the hole structure can be Fig.21 , Fig. 22 , Fig.23 , Fig.24 , Fig.25 , Fig.26 and Fig. 27 The structure of any of the diagrams in .

[0126] In one embodiment, a hole structure can be prepared on the back film of the composite panel by laser engraving or other processes.

[0127] The present application also provides a method for preparing a display module hole structure, comprising the following steps:

[0128] Step S100, preparing a large display panel;

[0129] First, a large display panel is prepared, wherein the large panel refers to a display panel before being cut into a target shape and size, and the large display panel may be a touch display panel structure.

[0130] Step S200, cutting a large display panel into a plurality of small display panel panels;

[0131] According to the shape and size of the required product, the large display panel is cut into multiple small display panel panels.

[0132] Step S300, preparing a back film plate;

[0133] A large-sized back film may be prepared first, and then cut into small back film panels that match the shape and size of the display panel panels.

[0134] Step S400, preparing a hole structure on the back film plate;

[0135] 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.

[0136] Step S500: Laminating the display panel small plate and the back film small plate to implement a partial opening process of the screen lamination to form a display panel with a hole structure and a partial display module of the back film. Fig.21 , Fig. 22 , Fig.23 , Fig.24 , Fig.25 , Fig.26 and Fig. 27 The structure of any of the diagrams in .

[0137] In one embodiment, a hole structure can be prepared on the back film plate by laser engraving or die cutting.

[0138] The present application also provides an electronic device 100, comprising a housing 20 and any of the above-mentioned display modules 11, wherein the housing 20 has an opening on one side, the display module 11 is located in the opening of the housing 20, and the edge of the display module 11 is matched and connected with the edge of the opening. The housing 20 is used to fix and support the display module 11, and can prevent external impurities such as water vapor and dust from affecting the performance of the display module 11.

[0139] The electronic device 100 provided by the present application has an edge of the first connection layer 112 located on one side of the display screen center to edge direction of the display panel 114 in the first curved portion 101a of the display module 11 of the electronic device 100, the thickness of the first connection layer 112 gradually decreases in the direction from the center to the edge of the display screen, and the first connection layer 112 is respectively connected to the surface layer 111 and the display panel 114 on both sides in the thickness direction in the first curved portion 101a. In the first curved portion 101a, by arranging the edge of the first connection layer 112 on one side of the display screen center to edge direction of the display panel 114, the thickness of the first connection layer 112 gradually decreases in the direction from the center to the edge of the display screen, and the first connection layer 112 is respectively connected to the surface layer 111 and the display panel 114 on both sides in the thickness direction, which can relieve the extrusion stress of the first connection layer 112 on the display panel 114 and reduce the wrinkles of the display panel 114 due to extrusion. The electronic device 100 with the display module 11 is not prone to wrinkles at the corners and has a better display effect.

[0140] 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 embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A display module, characterized in that: The display module includes a stacked surface layer, a first connection layer and a display panel, the display module includes a non-bending portion and a bending portion, the bending portion includes a first bending portion, the thickness of the first connection layer in the first bending portion gradually decreases along the direction from the center to the edge of the display module; at least two protrusions are provided on the edge of the first connection layer of the first curved portion, the protrusions protrude from the edge of the first connection layer along the direction from the center to the edge of the display module, the at least two protrusions are arranged at intervals along the extension direction of the edge of the first connection layer, and the protrusions are used to buffer the stress in the stress concentration area of ​​the first curved portion through deformation.

2. The display module according to claim 1, characterized in that: An arc length of the first connection layer in the first curved portion is smaller than an arc length of the display panel in the first curved portion.

3. The display module according to claim 2, characterized in that: A ratio of an arc length of the first connection layer in the first curved portion to an arc length of the display panel in the first curved portion is in a range of 80% to 96%.

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

5. The display module according to any one of claims 1 to 3, characterized in that: 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.

6. The display module according to claim 5, characterized in that: 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.

7. The display module according to any one of claims 1 to 3, characterized in that: The curved portion further includes a second curved portion, the second curved portion includes a side portion of the display module, and a thickness of the first connection layer in the second curved portion gradually decreases along a direction from the center to the edge of the display module.

8. The display module according to claim 7, characterized in that: An arc length of the first connection layer in the second curved portion is smaller than an arc length of the display panel in the second curved portion.

9. The display module according to claim 8, characterized in that: A ratio of an arc length of the first connection layer in the second curved portion to an arc length of the display panel in the second curved portion is in a range of 80% to 96%.

10. The display module according to any one of claims 1 to 3, characterized in that: The edge of the protrusion is connected to the edge of the non-protrusion portion of the first connection layer through a smooth transition.

11. The display module according to any one of claims 1 to 3, characterized in that: The edge of the protrusion is polygonal or curved.

12. The display module according to any one of claims 1 to 3, characterized in that: The display module further comprises at least one of a polarizing layer, a back film and a supporting member, and in the curved portion: a hole structure is arranged on at least one of the polarizing layer, the supporting member and the back film.

13. The display module according to claim 12, characterized in that: The hole structure includes at least one of a through hole and a blind hole.

14. The display module according to claim 12, 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 wave shape.

15. An electronic device, characterized in that: The display module comprises the display module according to any one of claims 1 to 14, and further comprises a shell, wherein the shell is fixedly connected to the outer edge of the display module.

16. A method for preparing a display module, characterized in that: The display module comprises a surface layer, a first connection layer and a display panel which are stacked, the display module comprises a non-bending portion and a bending portion, the bending portion comprises a first bending portion, the thickness of the first connection layer in the first bending portion gradually decreases along the direction from the center to the edge of the display module; at least two protrusions are arranged on the edge of the first connection layer of the first bending portion, the protrusions protrude from the edge of the first connection layer along the direction from the center to the edge of the display module, the at least two protrusions are arranged at intervals along the extension direction of the edge of the first connection layer, the protrusions are used to buffer the stress of the stress concentration area of ​​the first bending portion through deformation, the display module further comprises a back film, and a hole structure is arranged on the back film in the bending portion; The preparation method comprises the following steps: Prepare large display panel panels; A back film is laminated on the large display panel to form a large composite panel, a hole structure is prepared on the back film of the large composite panel, and the large composite panel is cut to form a plurality of small composite panels; or, the large display panel is first cut to form a plurality of small display panel panels, a small back film panel is prepared, a hole structure is prepared on the small back film panel, and then the small display panel panel and the small back film panel are laminated.

17. The method for preparing a display module according to claim 16, characterized in that: 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; 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.

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