Display module, preparation method thereof and display device

Abstract

This invention discloses a display module, its manufacturing method, and a display device. The display module includes: a display panel comprising a display portion, a bonding portion, and a bent portion located between the display portion and the bonding portion; a support layer located between the display portion and the bonding portion, comprising a first support layer corresponding to the display portion and a second support layer corresponding to the bonding portion; and an adhesive layer, at least a portion of which is located within the bent space enclosed by the bent portion, with both ends of the adhesive layer bonded to the first and second support layers respectively; the adhesive layer comprises multiple first adhesive layers and at least one second adhesive layer, wherein the elastic modulus of the first adhesive layers differs from that of the second adhesive layer, and the multiple first adhesive layers and at least one second adhesive layer are alternately arranged. The display module provided by this application can improve the problem of malfunction of the display module when the bent area is subjected to external force.

Description

Technical Field

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

[0002] Compared to liquid crystal displays, organic light-emitting diode (OLED) displays offer advantages such as lower energy consumption, lower cost, self-emissive properties, wider viewing angles, and faster response times, making them considered the most promising next-generation display technology. With the development of display technology, the industry's need to achieve narrower bezels to increase screen-to-body ratio has become increasingly urgent; however, narrowing the bezel area has brought some challenges. Summary of the Invention

[0003] In view of this, embodiments of this application provide a display module, a method for manufacturing the same, and a display device.

[0004] The first aspect of this application provides a display module, including: The display panel includes a display section, a mounting section, and a bent section located between the display section and the mounting section; A support layer is located between the display section and the bonding section. The support layer includes a first support layer corresponding to the display section and a second support layer corresponding to the bonding section. The adhesive layer, at least a portion of which is located in the bending space enclosed by the bending portion, has its two ends bonded to the first support layer and the second support layer, respectively. The adhesive layer includes a plurality of first adhesive layers and at least one second adhesive layer, wherein the elastic modulus of the first adhesive layer is different from that of the second adhesive layer, and the plurality of first adhesive layers and at least one second adhesive layer are alternately arranged.

[0005] In one embodiment, the number of first adhesive layers is greater than the number of second adhesive layers; In one embodiment, the elastic modulus of the first adhesive layer is less than that of the second adhesive layer; In one embodiment, the first adhesive layer includes a first sub-adhesive layer and a second sub-adhesive layer, the first sub-adhesive layer is bonded to the end of the first support layer near the bend, and the second sub-adhesive layer is bonded to the end of the second support layer near the bend. Wherein, a portion of the first sub-adhesive layer is bonded to the surface of the first support layer away from the display portion; and / or, a portion of the second sub-adhesive layer is bonded to the surface of the second support layer away from the bonding portion; In one embodiment, a portion of the first sub-adhesive layer is bonded to the surface of the first support layer away from the display portion; along a direction parallel to the display portion and pointing towards the bonding portion, the width of the first sub-adhesive layer located on the surface of the first support layer away from the display portion is d1, satisfying 0.1mm≥d1≥0.05mm; In one embodiment, a portion of the second sub-adhesive layer is bonded to the surface of the second support layer away from the bonding portion; along the direction parallel to the display portion pointing towards the bonding portion, the width of the second sub-adhesive layer located on the surface of the second support layer away from the display portion is d2, satisfying 0.1mm≥d2≥0.05mm; In one embodiment, a portion of the first sub-adhesive layer is bonded to the surface of the first support layer away from the display portion, and a portion of the second sub-adhesive layer overlaps the surface of the second support layer away from the bonding portion. Along a direction parallel to the display portion and pointing towards the bending portion, the width of the first sub-adhesive layer is equal to the width of the second sub-adhesive layer.

[0006] In one embodiment, the first adhesive layer includes a first sub-adhesive layer and a second sub-adhesive layer, the first sub-adhesive layer is bonded to the end of the first support layer near the bend, and the second sub-adhesive layer is bonded to the end of the second support layer near the bend. The first sub-adhesive layer and the second sub-adhesive layer have the same elastic modulus. In one embodiment, at least a portion of the first adhesive layer has the same elastic modulus; In one embodiment, the elastic modulus of each first adhesive layer is the same; In one embodiment, the adhesive layer includes a plurality of second adhesive layers, at least some of which have the same elastic modulus; In one embodiment, the elastic modulus of each second adhesive layer is the same.

[0007] In one embodiment, the first adhesive layer is formed by curing a first adhesive and the second adhesive layer is formed by curing a second adhesive; at least some components of the first adhesive and the second adhesive are of the same type of material; In one embodiment, the components of the first adhesive and the second adhesive are made of the same type of material; In one embodiment, the bonding strength between the first adhesive layer and the second adhesive layer is σ1, which satisfies σ1≥20mPa; In one embodiment, the thixotropic index of the first adhesive is ≥4; and / or, the thixotropic index of the second adhesive is ≥4. In one embodiment, the materials of the first adhesive and the second adhesive include any one of acrylic materials, epoxy materials, and silicone materials.

[0008] In one embodiment, the display panel includes a substrate and a light-emitting structure layer stacked together, and an adhesive layer is bonded to the substrate; The adhesive layer and the substrate have a bonding strength of σ2 and a bonding strength of σ3; σ2 ≥ 20 mPa; and / or σ3 ≥ 20 mPa. In one embodiment, the elastic modulus of the first adhesive layer is E1, which satisfies E1≤50mPa; In one embodiment, the elongation at break of the first adhesive layer is ε1, which satisfies ε1≥200%; In one embodiment, the elastic modulus of the second adhesive layer is E2, which satisfies E2≥500mPa.

[0009] In one embodiment, the surface of the adhesive layer facing away from the bend is a smooth curved surface; In one embodiment, the sum of the quantities of the first adhesive layer and the second adhesive layer is an odd number, and the quantity of the first adhesive layer is greater than the quantity of the second adhesive layer; In one embodiment, the sum of the number of the first adhesive layer and the second adhesive layer is ≤7; In one embodiment, the number of first adhesive layers is two, and the number of second adhesive layers is one; In one embodiment, the first adhesive layer includes a first sub-adhesive layer and a second sub-adhesive layer. The first sub-adhesive layer is bonded to the end of the first support layer near the bend, and the second sub-adhesive layer is bonded to the end of the second support layer near the bend. A plurality of second adhesive layers and first adhesive layers are alternately disposed between the first sub-adhesive layer and the second sub-adhesive layer. The adhesive layer also includes a third adhesive layer, which covers the side surface of the first adhesive layer and the second adhesive layer located between the first sub-adhesive layer and the second adhesive layer that is away from the display panel. The elastic modulus of the third adhesive layer is greater than that of the first adhesive layer and the second adhesive layer. In one embodiment, the material of the third adhesive layer is the same as the material of the second adhesive layer; In one embodiment, the third adhesive layer and the second adhesive layer are an integral structure.

[0010] In one embodiment, the display module further includes: A composite layer is located between the first support layer and the second support layer. The first support layer, the bend, the composite layer, the first support layer, and the composite layer constitute a receiving space. The ratio of the volume of the adhesive layer to the volume of the receiving space is V, which satisfies 90% ≥ V ≥ 70%. In one embodiment, the composite layer includes a composite buffer layer and a padding layer that are sequentially stacked along the direction away from the display portion; In one embodiment, the display module further includes a polarizing layer, an adhesive layer, and a cover plate that are sequentially stacked along the direction away from the display section; In one embodiment, the display module further includes a protective layer corresponding to the bent portion, and the protective layer is disposed in the same layer as the polarizing layer.

[0011] A second aspect of this application provides a method for manufacturing a display module, comprising: A display panel is provided, which includes a display section, a section to be bound, and a section to be bent located between the display section and the section to be bound. A first support layer and a second support layer are formed on the backlight side of the display panel, and an opening is formed between the first support layer and the second support layer, with the opening corresponding to the part to be bent. An adhesive material layer comprising multiple first adhesive material layers and at least one second adhesive material layer is formed in the opening. The first adhesive material layer and the second adhesive material layer are spaced apart and the elastic modulus of the first adhesive material layer and the elastic modulus of the second adhesive material layer are different. The two ends of the adhesive material layer are respectively bonded to the first support layer and the second support layer. The display panel is bent so that the part to be bent forms a bend. The first adhesive material layer and the second adhesive material layer are cured to obtain the first adhesive layer and the second adhesive layer.

[0012] In one embodiment, the step of preparing a plurality of first adhesive material layers and at least one second adhesive material layer in the opening includes: preparing a first sub-adhesive material layer and a second sub-adhesive material layer at the ends of the first support layer and the second support layer near the opening, respectively. A second adhesive material layer is prepared in the opening; In one embodiment, a method for preparing a plurality of first adhesive material layers and at least one second adhesive material layer in an opening includes: preparing a plurality of first adhesive material layers and at least one second adhesive material layer using a piezoelectric valve or a pneumatic dispensing valve; In one embodiment, the method of curing the first adhesive material layer and the second adhesive material layer to obtain the first adhesive layer and the second adhesive layer includes: curing the first adhesive material layer and the second adhesive layer by means of ultraviolet curing or heat curing.

[0013] A third aspect of this application provides a display device, including the display module described above, or including a display module prepared by the preparation method described above.

[0014] The beneficial effects of this application are as follows: By setting multiple first adhesive layers and at least one second adhesive layer with different elastic moduli and alternating arrangements at the bending portion of the lower frame of the display module, and by bonding the two ends of the adhesive layers to the first support layer and the second support layer respectively, this application solves the problem that when a single adhesive layer is used in the bending area of ​​the lower frame of the display module, the stress concentration is sharp and intense, leading to easy cracking of the film layer and easy breakage of the wiring in the bending area. Furthermore, it solves the problem of slippage between the support layer and the display panel when the foldable display module 20 is folded or unfolded. Because the two ends of the adhesive layer are bonded to the first and second support layers respectively, and the adhesive layer is correspondingly arranged to the bending portion of the display panel, the shear stress generated by the slippage can be transmitted and released step by step among the multiple adhesive layers, causing deformation of the adhesive layer. This avoids the problem of film peeling or damage to the foldable display module 20 due to excessive slippage between the support layer and the display panel. Attached Figure Description

[0015] Figure 1a This is a top view of a display module. Figure 1b This is a top view of a foldable display module. Figure 2 It is a kind of Figure 1a A schematic cross-sectional view of the structure at section A-A'. Figure 3 This is provided by some embodiments of this application. Figure 1a A schematic cross-sectional view of the structure at section A-A'. Figure 4 Other embodiments provided in this application Figure 1a A schematic cross-sectional view of the structure at section A-A'. Figure 5 This application provides further embodiments. Figure 1a A schematic cross-sectional view of the structure at section A-A'. Figure 6 This application provides further embodiments. Figure 1a A schematic cross-sectional view of the structure at section A-A'. Figure 7 This application provides further embodiments. Figure 1a A schematic cross-sectional view of the structure at section A-A'. Figure 8 This application Figure 7 A schematic diagram of the unfolded structure of the middle bend; Figure 9 This application provides further embodiments. Figure 1a A schematic cross-sectional view of the structure at section A-A'. Figure 10 This application Figure 9 A schematic diagram of the unfolded structure of the middle bend; Figure 11 This is a flowchart illustrating a method for manufacturing a display module according to an embodiment of this application; Figures 12 to 14 This is a schematic diagram illustrating a manufacturing process of a display module according to an embodiment of this application; Figure 15 This is a top view of the structure of a display device.

[0016] Explanation of reference numerals in the attached figures: 10. Display module; 140. Display panel; 30. Foldable display module; 301. First zone; 302. Second zone; 141. Display section; 142. Bonding section; 143. Bending section; 150. Support layer; 151. First support layer; 152. Second support layer; 160. Adhesive layer; 161. First adhesive layer; 162. Second adhesive layer; 1611. First sub-adhesive layer; 1612, Second sub-adhesive layer; 1613, Third sub-adhesive layer; 170, Substrate; 180, Light-emitting structure layer; 190, Third adhesive layer; 200, Composite layer; 201, Composite buffer layer; 202, Pad layer; 210, Polarizing layer; 220, Adhesive layer; 230, Cover plate; 240, Protective layer; 250, Part to be bonded; 260, Part to be bent; 270, Opening; 280, First adhesive material layer; 281, First sub-adhesive material layer; 282, Second sub-adhesive material layer; 290, Second adhesive material layer; 40. Display device; AA, Display area; NA, Non-display area; B. Display side; C. Non-display side; D. Bending area; E. Non-bending area. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.

[0018] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in the embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0019] It should be understood that in the description of the embodiments of this application, the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the scheme of the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0020] Furthermore, when an element or layer is referred to as being "on" another element or layer, "connected to," or "bonded to" another element or layer, the element or layer may be directly on the other element or layer, directly connected to, or directly bonded to the other element or layer, or there may be intermediate elements or layers. However, when an element or layer is referred to as being "directly on" another element or layer, "directly connected to," or "directly bonded to" another element or layer, there are no intermediate elements or layers.

[0021] The terms First, Second, etc., are used to describe various elements, components, regions, layers, and / or parts, but these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, and / or part from another element, component, region, layer, and / or part.

[0022] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] For the display module, the display panel is bent and bonded in the lower bezel area to form a bending zone. As the bezel narrows, the bending radius of this bending zone decreases, and the stress on the wiring in the bending zone increases. This bending zone is extremely fragile; if subjected to additional stress, such as compression or impact, it can easily cause cracks in the film layer and breakage of the wiring. Furthermore, during the foldable display module 20's folding and unfolding process, slippage can easily occur between the film layers, leading to yield losses and increasing the risk of reduced display module reliability.

[0024] Figure 1a This is a top view schematic diagram of the structure of a display module 10. Figure 1b A top view of the structure of a foldable display module. Figure 2 It is a kind of Figure 1a A schematic cross-sectional view of the structure at section A-A'. (See diagram.) Figure 1b As shown, the foldable display module 20 includes a first region 301 and a second region 302 that are interconnected. It should be noted that the cross-sectional view in this case can also be a cross-sectional view of the lower edge of the foldable display module 20. Figure 2As shown, in order to increase the strength of the area where the bending portion 143 of the display panel 140 is located at the lower edge of the display module 10, in related technologies, glue is filled between the two support layers 150 and the opening of the corresponding bending portion 143 to form an internal support structure. However, since only one type of glue is used, and the elastic modulus of the glue after curing is greater than 500 mPa, the shape of the area where the bending portion 143 is located is fixed. If the area where the bending portion 143 is located is subjected to additional stress, it is easy to cause cracks in the film layer of the display module 10, and it is also easy to cause the wiring in the area where the bending portion 143 is located to break, thereby causing the display module 10 to malfunction. Among them, the additional force can include compression, collision, and the force generated by the sliding between the support layer 150 and the display panel 140 when the foldable display module 20 is folded or unfolded. It should be noted that the elastic modulus is an important parameter describing the ability of a material layer to resist deformation in the elastic deformation stage. It reflects the rigidity of the material layer. The smaller the elastic modulus, the better the flexibility of the material layer, and the easier it is to undergo elastic deformation.

[0025] The specific implementation of the embodiments of this application will be further described below with reference to the accompanying drawings.

[0026] Figure 3 This is provided by some embodiments of this application. Figure 1a A schematic cross-sectional view of the structure at section A-A'. Specifically, refer to... Figure 1a , Figure 1b and Figure 3 As shown, a first aspect of this application provides a display module 10, wherein the display module 10 includes: a display panel 140, the display panel 140 including a display portion 141, a bonding portion 142, and a bending portion 143 located between the display portion 141 and the bonding portion 142; a support layer 150, the support layer 150 being located between the display portion 141 and the bonding portion 142, the support layer 150 including a first support layer 151 corresponding to the display portion 141 and a second support layer 152 corresponding to the bonding portion 142; an adhesive layer 160, at least the adhesive layer 160 being located within the bending space enclosed by the bending portion 143, the two ends of the adhesive layer 160 being bonded to the first support layer 151 and the second support layer 152 respectively; the adhesive layer 160 including a plurality of first adhesive layers 161 and at least one second adhesive layer 162, the elastic modulus of the first adhesive layer 161 being different from the elastic modulus of the second adhesive layer 162, and the plurality of first adhesive layers 161 and at least one second adhesive layer 162 being alternately arranged.

[0027] In this embodiment, by providing multiple first adhesive layers 161 and at least one second adhesive layer 162 with different elastic moduli and alternating arrangements in the bending portion 143 of the lower frame of the display module 10, the problem of malfunction of the display module 10 caused by the rapid stress concentration when a single adhesive layer 160 is provided in the bending area D of the lower frame of the display module 10 is subjected to external force is solved. Specifically, the film layer of the display module 10 is prone to cracking when subjected to external force, and the traces in the bending area D are prone to breakage. The alternating arrangement of the first adhesive layer 161 and the second adhesive layer 162 with different elastic moduli can reconstruct the internal stress field generated in the bending area D when subjected to external force. The adhesive layer 160 with a high elastic modulus bears the main load and provides stiffness support, while the adhesive layer 160 with a low elastic modulus buffers and absorbs local stress, making the stress field more uniform and reducing peak stress. This avoids the sharp concentration of stress caused by the modulus mismatch of a single adhesive layer 160, thereby effectively improving the strength of the bending area D and improving the problem that the film layer of the bending area D of the display module 10 is prone to cracking and the traces provided in the bending area D are prone to breakage when subjected to external force. Furthermore, the display module 10 can be a foldable display module 20. When the foldable display module 20 is folded or unfolded, the support layer 150 and the display panel 140 slide against each other. Since the two ends of the adhesive layer 160 are bonded to the first support layer 151 and the second support layer 152 respectively, and the adhesive layer 160 is correspondingly arranged with the bending portion 143 of the display panel 140, the shear stress generated by the sliding can be transmitted and released step by step among the multiple adhesive layers 160, causing the adhesive layer 160 to deform. This avoids the problem of film peeling or damage to the display module 10 due to excessive sliding between the support layer 150 and the display panel 140. It should be noted that the bending portion 143 of the display panel 140 is located in the bending area D of the display module 10, and the display portion 141 and the bonding portion 142 of the display panel 140 are located in the non-bending area E of the display module 10. The sliding direction between the support layer 150 and the display panel 140 intersects with the direction from the bending portion 143 to the display portion 141. When the foldable display module 20 is folded or unfolded, the support layer 150 and the display panel 140 will slide. Specifically, the first support layer 151 and the display part 141 will slide, as will the second support layer 152 and the binding part 142.

[0028] It should be noted that the display module 10 is not limited to the foldable display module 20.

[0029] Figure 4 Other embodiments provided in this application Figure 1a A schematic cross-sectional view of the structure at section A-A'. (Refer to...) Figure 1a , Figure 1b as well as Figures 3-4 As shown, in one embodiment, the number of first adhesive layers 161 is greater than the number of second adhesive layers 162.

[0030] In this embodiment, since multiple first adhesive layers 161 and at least one second adhesive layer 162 are alternately arranged, and the number of first adhesive layers 161 is greater than the number of second adhesive layers 162, both ends of the adhesive layer 160 are first adhesive layers 161, and the adhesive layers 161 that are bonded to the first support layer 151 and the second support layer 152 are both first adhesive layers 161, forming a symmetrical structure with symmetrical modulus on both sides and complementary modulus in the middle. This makes the stress distribution in the bending area D more balanced when subjected to external force, avoiding the problem of excessive stress on one side and asymmetrical stress on the interface that is prone to occur with multiple asymmetrically distributed adhesive layers 160. This further reduces local stress concentration, improves the load-bearing strength of the bending area D, prevents the film layer of the display module 10 from cracking when subjected to external force, and effectively prevents the wiring provided in the bending area D from breaking. At the same time, it further alleviates the slippage between the support layer 150 and the two film layers of the display panel 140 when the foldable display module 20 is folded or unfolded, and further reduces the risk of film peeling or damage to the foldable display module 20 due to excessive slippage. When the foldable display module 20 is folded or unfolded, the support layer 150 and the display panel 140 will slide. Specifically, the first support layer 151 and the display part 141 will slide, as will the second support layer 152 and the binding part 142.

[0031] In one optional embodiment, the elastic modulus of the first adhesive layer 161 is less than that of the second adhesive layer 162.

[0032] In this embodiment, the first adhesive layer 161 is a low-modulus adhesive layer compared to the second adhesive layer 162, exhibiting higher flexibility and stronger deformation capability. Its large deformation can buffer the deformation of the bending area D of the display module 10 under external force. For the foldable display module 20, the first adhesive layer 161 can buffer the slippage between the support layer 150 and the display panel 140 caused by folding or unfolding the foldable display module 20, and buffer stress concentration at the bonding points with the first support layer 151 and the second support layer 152, preventing peeling, warping, or detachment at the interface due to excessive rigidity. Furthermore, the second adhesive layer 162 is a high-modulus adhesive layer compared to the first adhesive layer 161. Located in the middle of the adhesive layer 160, it provides necessary support for the bending portion 143 and acts as a skeleton, ensuring the strength of the frame area of ​​the display module 10, i.e., the bending area D where the bending portion 143 is located and the bonding area where the bonding portion 142 is located. Specifically, when the foldable display module 20 is folded or unfolded, the support layer 150 and the display panel 140 will slide. Specifically, the first support layer 151 and the display part 141 will slide, as will the second support layer 152 and the binding part 142.

[0033] In one optional embodiment, the first adhesive layer 161 includes a first sub-adhesive layer 1611 and a second sub-adhesive layer 1612. The first sub-adhesive layer 1611 is bonded to the end of the first support layer 151 near the bending portion 143, and the second sub-adhesive layer 1612 is bonded to the end of the second support layer 152 near the bending portion 143. A portion of the first sub-adhesive layer 1611 is bonded to the surface of the first support layer 151 away from the display portion 141; and / or a portion of the second sub-adhesive layer 1612 is bonded to the surface of the second support layer 152 away from the binding portion 142.

[0034] In this embodiment, by bonding a portion of the first sub-adhesive layer 1611 to the surface of the first support layer 151 away from the display portion 141, the bonding area between the first sub-adhesive layer 1611 and the first support layer 151 is effectively increased, avoiding interface debonding and warping failures that are prone to occur when only the ends are bonded. Furthermore, the adhesive layer 160 is stacked with the display panel 140 and bonded to the bent portion 143 of the display panel 140, effectively limiting the relative slippage between the display panel 140 and the first support layer 151. Similarly, by bonding a portion of the second sub-adhesive layer 1612 to the surface of the second support layer 152 away from the display portion 141, the bonding area between the second sub-adhesive layer 1612 and the second support layer 152 is effectively increased, avoiding interface debonding and warping failures that are prone to occur when only the ends are bonded. Furthermore, the adhesive layer 160 is stacked with the display panel 140 and bonded to the bent portion 143 of the display panel 140, effectively limiting the relative slippage between the display panel 140 and the first support layer 151.

[0035] Furthermore, the bending portion 143 is located in the bending region D of the display module 10, and the first sub-adhesive layer 1611, which is bonded to the surface of the first support layer 151 away from the display portion 141, and the second sub-adhesive layer 1612, which is bonded to the surface of the second support layer 152 away from the display portion 141, are located in the non-bending region E of the display module 10. The bending region D is connected to the non-bending region E.

[0036] With the above settings, along the direction perpendicular to the plane where the display panel 140 is located, the maximum thickness of the first sub-adhesive layer 1611 and / or the maximum thickness of the second sub-adhesive layer 1612 are both greater than the thickness of the support layer 150.

[0037] Reference Figure 1a , Figure 1b and Figure 4 As shown, in one optional embodiment, a portion of the first sub-adhesive layer 1611 is bonded to the side surface of the first support layer 151 away from the display portion 141; along the direction parallel to the display portion 141 pointing to the bonding portion 142, the width of the first sub-adhesive layer 1611 located on the side surface of the first support layer 151 away from the display portion 141 is d1, satisfying 0.1mm≥d1≥0.05mm.

[0038] In this embodiment, d1 can be 0.1mm, 0.09mm, 0.08mm, 0.07mm, 0.06mm, 0.05mm, etc. By limiting the width of the first sub-adhesive layer 1611 on the side of the first support layer 151 away from the display part 141, interference between the first sub-adhesive layer 1611 and other film layers located between the first support part and the second support part in the display module 10 is effectively avoided. Specifically, a shim is included between the first support part and the second support part. Generally, the shim is recessed by 0.2mm relative to the non-bending area E of the display module. If the overlap width between the two ends of the adhesive layer 160 and the support layer 150 is too wide, there will be interference between the adhesive layer and the shim.

[0039] Reference Figure 1a , Figure 1b as well as Figures 4-5 As shown, in one optional embodiment, a portion of the second sub-adhesive layer 1612 is bonded to the side surface of the second support layer 152 away from the binding portion 142; along the direction parallel to the display portion 141 pointing to the binding portion 142, the width of the second sub-adhesive layer 1612 located on the side surface of the first support layer 151 away from the display portion 141 is d2, satisfying 0.1mm≥d2≥0.05mm.

[0040] In this embodiment, d2 can be 0.1mm, 0.09mm, 0.08mm, 0.07mm, 0.06mm, 0.05mm, etc. By limiting the width of the second sub-adhesive layer 1612 on the side surface of the second support layer 152 away from the display portion 141, interference between the second sub-adhesive layer 1612 and other film layers located between the first and second support portions in the display module 10 is effectively avoided.

[0041] In one optional embodiment, a portion of the first sub-adhesive layer 1611 is bonded to the surface of the first support layer 151 away from the display portion 141, and a portion of the second sub-adhesive layer 1612 overlaps the surface of the second support layer 152 away from the binding portion 142. Along a direction parallel to the display portion 141 pointing towards the bending portion 143, the width of the first sub-adhesive layer 1611 is equal to the width of the second sub-adhesive layer 1612.

[0042] In this embodiment, by keeping the overlap width of the first sub-adhesive layer 1611 and the second sub-adhesive layer 1612 at both ends of the adhesive layer 160 consistent with that of the first support layer 151 and the second support layer 152, the bonding area and shear force distribution of the adhesive layer 160 on both sides of the bonding interface can be symmetrical. This effectively avoids problems such as stress concentration on one side and excessive local peeling force caused by uneven overlap width, making the interlayer force more balanced and improving the overall bonding reliability.

[0043] Reference Figure 1a , Figure 1b as well as Figures 3-4 As shown, in one embodiment, the first adhesive layer 161 includes a first sub-adhesive layer 1611 and a second sub-adhesive layer 1612. The first sub-adhesive layer 1611 is bonded to the end of the first support layer 151 near the bending portion 143, and the second sub-adhesive layer 1612 is bonded to the end of the second support layer 152 near the bending portion 143. The first sub-adhesive layer 1611 and the second sub-adhesive layer 1612 have the same elastic modulus.

[0044] In this embodiment, the first sub-adhesive layer 1611 and the second sub-adhesive layer 1612 are bonded to the first support layer 151 and the second support layer 152 respectively. The elastic modulus of the first sub-adhesive layer 1611 and the second sub-adhesive layer 1612 are the same, that is, the elastic modulus of the two ends of the adhesive layer 160 is the same. When the bending area D of the display module 10 is subjected to external force, the stress can be smoothly transmitted inside the adhesive layer, which allows the first sub-adhesive layer 1611 and the second sub-adhesive layer 1612 to expand or bend synchronously. The interface stress is more gentle, and the bonding between the first sub-adhesive layer 1611 and the first support layer 151 and between the second sub-adhesive layer 1612 and the second support layer 152 is more stable. This improves the problem of cracks in the film layer of the display module 10 and the easy breakage of the wiring in the bending area D. When the display module 10 is a foldable display module 20, the foldable display module 20 is less prone to delamination and cracking between the support layer 150 and the display panel 140 and between the support layer 150 and the adhesive layer 160 caused by the sliding between the support layer 150 and the display panel 140 when folded or unfolded.

[0045] In one alternative embodiment, at least a portion of the first adhesive layer 161 has the same elastic modulus.

[0046] In this embodiment, by keeping the elastic modulus of some of the first adhesive layers 161 consistent, the stress transmission path of the adhesive layer 160 can be made basically stable. Furthermore, the elastic modulus of one or more second adhesive layers 162 is not limited. While ensuring the basic stability of the stress transmission path of the adhesive layer 160, the stiffness of the adhesive layer 160 can be flexibly adjusted through differentiated design of the elastic modulus of the second adhesive layers 162. That is, the stiffness of the bending area D of the display module 10 can be flexibly adjusted.

[0047] In one optional embodiment, each of the first adhesive layers 161 has the same elastic modulus.

[0048] In this embodiment, by keeping the elastic modulus of each first adhesive layer 161 consistent, the stability of the stress transmission path of the adhesive layer 160 can be further improved.

[0049] In one optional embodiment, adhesive layer 160 includes a plurality of second adhesive layers 162, at least some of which have the same elastic modulus.

[0050] In this embodiment, by keeping the elastic modulus of some of the second adhesive layers 162 consistent, the stress transmission path of the adhesive layer 160 can be made basically stable. Furthermore, the elastic modulus of the multiple first adhesive layers 161 is not limited. While ensuring the basic stability of the stress transmission path of the adhesive layer 160, the stiffness of the adhesive layer 160 can be flexibly adjusted by differentiating the elastic moduli of the first adhesive layers 161. That is, the stiffness of the bending area D of the display module 10 can be flexibly adjusted.

[0051] In one optional embodiment, each of the second adhesive layers 162 has the same elastic modulus.

[0052] In this embodiment, by keeping the elastic modulus of each second adhesive layer 162 consistent, the stability of the stress transmission path of the adhesive layer 160 can be further improved.

[0053] In one optional embodiment, the adhesive layer includes a plurality of second adhesive layers 162, each second adhesive layer 162 having the same elastic modulus and each first adhesive layer 161 having the same elastic modulus.

[0054] In this embodiment, by ensuring that the elastic modulus of each first adhesive layer 161 and each second adhesive layer 162 is kept consistent, the two types of adhesive layers can exhibit stable and consistent deformation characteristics under external force. When the display module 10 is a foldable display module 20, the foldable display module 20 exhibits stable and consistent deformation characteristics when sliding occurs between the support layer 150 and the display panel 140 during folding or unfolding. Compared to a structure where only one type of adhesive layer has the same elastic modulus, this further eliminates local stress fluctuations, making the stress distribution generated when sliding occurs between the support layer 150 and the display panel 140 more uniform and regular, and significantly reducing stress concentration between the support layer 150 and the display panel 140.

[0055] In one embodiment, the first adhesive layer 161 is formed by curing a first adhesive and the second adhesive layer 162 is formed by curing a second adhesive; at least some components of the first adhesive and the second adhesive are of the same type of material; In this embodiment, it should be noted that the fact that at least some components of the first adhesive and the second adhesive are of the same material type means that the main resins of at least some components of the first adhesive and the second adhesive are both acrylic materials, or both epoxy materials, or both silicone materials, etc. By setting the at least some components of the first adhesive and the second adhesive to be of the same material type, the molecular structures of the first adhesive and the second adhesive material system are similar, the polarity is matched and the interfacial wettability is good. The adhesive layers can form interpenetrating molecular chains, co-curing or chemical bonding, so that the interfacial bonding strength of the first adhesive layer 161 and the second adhesive layer 162 after curing is higher than that of dissimilar material systems, reducing the risk of separation, peeling and debonding between the first adhesive layer 161 and the second adhesive layer 162.

[0056] In one optional embodiment, the components of the first adhesive and the second adhesive are made of the same type of material.

[0057] In this embodiment, by making the materials of the components of the first adhesive and the second adhesive completely identical, such that the main resins of each component of the first adhesive and the second adhesive belong to the same acrylic material, or the same epoxy material, or the same organosilicon material, the bonding strength of the interface between the first adhesive layer 161 and the second adhesive layer 162 can be further improved, and the risk of separation, peeling and debonding between the first adhesive layer 161 and the second adhesive layer 162 can be further reduced.

[0058] In one optional embodiment, the bonding strength between the first adhesive layer 161 and the second adhesive layer 162 is σ1, which satisfies σ1≥20mPa.

[0059] In this embodiment, the bonding strength between the first adhesive layer 161 and the second adhesive layer 162 can be 20 MPa, 30 MPa, 50 MPa, or 80 MPa, etc. By limiting the bonding strength between the first adhesive layer 161 and the second adhesive layer 162 to be greater than or equal to 20 MPa, the bonding reliability between the first adhesive layer 161 and the second adhesive layer 162 is ensured, preventing interface separation between the two adhesive layers, improving the structural integrity of the adhesive layers in the bending area D, and enabling the stress to be smoothly transmitted at the adhesive layer interface when the display module 10 is subjected to external forces. Simultaneously, when the display module 10 is a foldable display module 20, the stress generated by the sliding of the support layer 150 and the display panel 140 when the foldable display module 20 is folded or unfolded can be smoothly transmitted at the adhesive layer interface.

[0060] As an optional embodiment, the thixotropic index of the first adhesive is ≥4; and / or, the thixotropic index of the second adhesive is ≥4; It should be noted that the thixotropic index is an indicator used to describe the ability of a fluid material to recover its original structure after structural damage under shear force. A higher thixotropic index indicates a stronger ability of the material to maintain its shape under low shear conditions. In this embodiment, the thixotropic index of the first adhesive can be 4, 5, 6, or 7, etc. The thixotropic index of the second adhesive can also be 4, 5, 6, or 7, etc. A thixotropic index ≥4 for the first adhesive ensures sufficient structural viscosity in its static, coated, and uncured states, effectively suppressing dripping, overflowing, and spillage along the surface of the bend 143, ensuring the dimensional accuracy and regularity of the adhesive layer 160. A thixotropic index ≥4 for the second adhesive ensures sufficient structural viscosity in its static, coated, and uncured states, effectively suppressing dripping, overflowing, and spillage along the surface of the bend 143, ensuring the dimensional accuracy and regularity of the second adhesive layer 162.

[0061] Reference Figure 4The surfaces of the first sub-adhesive layer 1611 and the second sub-adhesive layer 1612 that are far from the display panel 140 are curved because when the adhesive layer 160 is prepared, the first adhesive layer 161 is prepared first. Before the adhesive is cured, it is in a fluid state. Affected by surface tension, the edge area of ​​the adhesive gradually forms a curved surface. The larger the thixotropic index of the adhesive, the closer the edge of the adhesive is to a plane, which is more like a straight line in the cross-sectional view.

[0062] In one optional embodiment, the materials of the first adhesive and the second adhesive include any one of acrylic materials, epoxy materials, and silicone materials.

[0063] In this embodiment, the materials of the first adhesive and the second adhesive can be selected according to actual needs.

[0064] Figure 7 This application provides further embodiments. Figure 1a A schematic diagram of the cross-sectional structure at section A-A'. Figure 8 This application Figure 7 A schematic diagram of the unfolded structure of the central bend 143. In one embodiment, refer to... Figures 7-8 The display panel 140 includes a substrate 170 and a light-emitting structure layer 180 stacked together. An adhesive layer is bonded to the substrate 170, and the adhesive layer, substrate 170, and light-emitting structure layer 180 are stacked sequentially. The adhesion strength between the adhesive layer and the substrate 170 is σ2, and the adhesion strength between the adhesive layer and the support layer 150 is σ3; satisfying σ2 ≥ 20 mPa; and / or, satisfying σ3 ≥ 20 mPa.

[0065] In this embodiment, σ2 can be 20 mPa, 30 mPa, 50 mPa, or 80 mPa, etc. The bonding strength between the adhesive layer 160 and the substrate 170 is greater than or equal to 20 mPa, ensuring stable and reliable bonding between the adhesive layer 160 and the substrate 170, and allowing the adhesive layer 160 to maintain good synchronous deformation under external force. For example, the external force can be the force generated by the sliding between the support layer 150 and the display panel 140 when the foldable display module 20 is folded or unfolded. σ3 can be 20 mPa, 30 mPa, 50 mPa, or 80 mPa, etc. When the foldable display module 20 is folded or unfolded, the support layer 150 and the display panel 140 slide. The end of the support layer 150 near the adhesive layer 160 will be displaced relative to the initial position, generating stress. The bonding strength between the adhesive layer 160 and the support layer 150 is greater than or equal to 20mPa, which can ensure the bonding strength between the two ends of the adhesive layer 160 and the first support layer 151 and the second support layer 152. The stress can be smoothly transmitted at the interface of the adhesive layer 160.

[0066] Furthermore, the side of the display panel 140 closest to the substrate 170 is the display side B, and the side of the display panel 140 away from the substrate 170 is the non-display side C. In this way, the support layer 150 will not affect the light emission of the display panel 140.

[0067] In one optional embodiment, the elastic modulus of the first adhesive layer 161 is E1, which satisfies E1≤50mPa.

[0068] In this embodiment, E1 can be 10 mPa, 20 mPa, 30 mPa, 40 mPa, or 50 mPa, etc. The elastic modulus of the first adhesive layer 161 is less than or equal to 50 mPa. The force required for the deformation of the first adhesive layer 161 is small, which makes it more tolerant of the stress generated when the bending area D of the display module 10 is subjected to external force. It also makes it more tolerant of the slippage between the support layer 150 and the display panel 140 when the foldable display module 20 is folded or unfolded, absorbing the stress generated by the slippage and preventing damage to the support layer 150 and the display panel 140.

[0069] In one optional embodiment, the elongation at break of the first adhesive layer 161 is ε1, which satisfies ε1≥200%.

[0070] It should be noted that elongation at break refers to the percentage increase in length of a material layer when stretched to break, used to characterize the flexibility and elasticity of the material. A higher elongation at break indicates a greater tolerance for deformation. In this embodiment, ε1 can be 200%, 250%, 350%, 450%, or 650%, etc. When the bending area D of the display module 10 is subjected to external force, the film layer will compress the adhesive layer 160. The elongation at break of the first adhesive layer 161 is greater than or equal to 200%, allowing it to undergo significant elastic deformation under pressure, preventing cracking due to insufficient deformation. For the foldable display module 20, during folding or unfolding, slippage occurs between the support layer 150 and the display panel 140, compressing the adhesive layer 160. The elongation at break of the first adhesive layer 161 is greater than or equal to 200%, allowing it to undergo significant elastic deformation under pressure, preventing cracking due to insufficient deformation. The first adhesive layer 161 may include a first sub-adhesive layer 1611 and a second sub-adhesive layer 1612. The first sub-adhesive layer 1611 and the second sub-adhesive layer 1612 are bonded to the first support layer 151 and the second support layer 152, respectively. Thus, the first sub-adhesive layer 1611 and the second sub-adhesive layer 1612, with an elongation at break greater than or equal to 200%, directly contact and bond to the first support layer 151 and the second support layer 152, respectively. This can alleviate the interfacial stress of the film layer when the foldable display module 20 slips due to folding or unfolding, preventing damage to the film layer of the foldable display module 20. Specifically, it can prevent excessive stress at the contact interface between the support layer 150 and the display panel 140 and the adhesive layer 160, thus avoiding damage to the display panel 140.

[0071] In one optional embodiment, the elastic modulus of the second adhesive layer 162 is E2, which satisfies E2≥500mPa.

[0072] In this embodiment, E1 can be 500 mPa, 550 mPa, 600 mPa, 650 mPa, or 700 mPa, etc. The elastic modulus of the second adhesive layer 162 is greater than or equal to 500 mPa, ensuring excellent stiffness and structural support. This guarantees the overall shape and structural stability of the bending area D of the display module 10, preventing the wiring in the bending area D from breaking under external force, and preventing cracks in the film layer. For the foldable display module 20, when it is folded or unfolded, the support layer 150 can prevent excessive relative slippage between the film layers during folding or unfolding, and acts as a skeleton to maintain the overall shape and structural stability of the adhesive layer 160 and the bending area D.

[0073] Figure 5 This application provides further embodiments. Figure 1a A schematic diagram of the cross-sectional structure at section A-A'. Figure 8 This application Figure 7 A schematic diagram of the unfolded structure of the middle bend 143. (Refer to...) Figure 1a , Figure 1b , Figures 3-5 as well as Figure 8 In one embodiment, the surface of the adhesive layer 160 facing away from the bend 143 is a smooth curved surface.

[0074] In this embodiment, it should be noted that the smooth curved surface of the adhesive layer 160 away from the bending portion 143 can be understood as follows: an adhesive material layer is prepared on the bending portion 143 of the display panel 140. Along a direction perpendicular to the plane of the display panel 140, the surface of the adhesive material layer corresponding to the bending portion 143 away from the display panel 140 is flat. Then, the bending portion 143 of the display panel 140 is bent, and the adhesive material layer is cured to obtain the adhesive layer. During the bending process, the adhesive material layer is compressed, and the thickness of the adhesive material layer in the middle is greater than the thickness at both ends of the adhesive layer 160. However, the surface of the adhesive layer 160 away from the bending portion 143 remains a smooth curved surface. Thus, because the smooth curved surface has no sharp corners or abrupt contours, when the adhesive layer 160 is subjected to stress, the stress can be smoothly transitioned and evenly distributed along the adhesive layer 160, avoiding stress peaks at the corners, thereby reducing the risk of cracking, interface debonding, and damage to the adhesive layer 160.

[0075] Alternatively, the fact that the surface of the adhesive layer 160 facing away from the bending portion 143 is a smooth curved surface can be understood as follows: when the adhesive layer 160 only includes the first adhesive layer 161 and the second adhesive layer 162, the first adhesive material layer 280 and the second adhesive material layer are prepared at intervals on the display panel 140. Along the direction perpendicular to the plane where the display panel 140 is located, the thickness of the first adhesive material layer 280 corresponding to the bending portion 143 is the same as the thickness of the second adhesive material layer. After the bending portion 143 of the display panel 140 is bent, the adhesive layer 160 will be squeezed. The thickness of the adhesive layer 160 in the middle will be greater than the thickness of the adhesive layer 160 at both ends, but the surface of the adhesive layer 160 facing away from the bending portion 143 is still a smooth curved surface. Thus, because the smooth curved surface has no sharp corners and no abrupt contours, the stress can be smoothly transitioned and evenly distributed along the adhesive layer 160 when it is subjected to stress, avoiding stress peaks at the corners, thereby reducing the risk of cracking, interface debonding and damage of the adhesive layer 160.

[0076] In one optional embodiment, the sum of the number of the first adhesive layer 161 and the second adhesive layer 162 is an odd number, and the number of the first adhesive layer 161 is greater than the number of the second adhesive layer 162.

[0077] In this embodiment, refer to Figures 3-5When the sum of the number of the first adhesive layer 161 and the second adhesive layer 162 is odd and the number of the first adhesive layer 161 is greater than the number of the second adhesive layer 162, the two adhesive layers can be set alternately, while ensuring that the two ends of the adhesive layer are both the first adhesive layer 161 and the middle is a second adhesive layer 162, or the first adhesive layer 161 and the second adhesive layer 162 are set alternately, so that the stress distribution in the bending area D is more balanced when subjected to external force.

[0078] In addition, refer to Figure 4 The elastic modulus of each first adhesive layer 161 can be the same. When there are two first adhesive layers 161, a second adhesive layer 162 is set in the middle of the two first adhesive layers 161. The adhesive layers can form a symmetrical structure with symmetrical modulus at both ends and complementary modulus in the middle. This makes the stress distribution of the bending area D more balanced when subjected to external force, avoids the problem of excessive stress on one side and asymmetrical stress at the interface that is easy to occur in the two adhesive layers, further reduces local stress concentration, and improves the load-bearing strength of the bending area D. In addition, refer to Figure 5 The elastic modulus of each first adhesive layer 161 can be the same. When the number of second adhesive layers 162 is greater than or equal to two, the elastic modulus of each second adhesive layer 162 can be the same. Thus, the first adhesive layer 161 is provided at both ends of the adhesive layer, and the second adhesive layer 162 and the first adhesive layer 161 are provided between the two ends of the first adhesive layer 161. The adhesive layer 160 can form a symmetrical structure with symmetrical modulus at both ends and complementary modulus in the middle. This makes the stress distribution of the bending area D more balanced when subjected to external force, avoids the problem of excessive stress on one side and asymmetrical stress at the interface that is easy to occur in the two adhesive layers, further reduces local stress concentration, and improves the load-bearing strength of the bending area D.

[0079] In one optional embodiment, the sum of the number of the first adhesive layer 161 and the second adhesive layer 162 is ≤7.

[0080] In this embodiment, by setting the sum of the number of the first adhesive layer 161 and the second adhesive layer 162 to be less than or equal to 7, the difficulty in manufacturing the adhesive layer 160 can be avoided, and the problem of uneven stress distribution between the two adhesive layers with too many layers and different elastic moduli during the folding or unfolding of the foldable display module 20 can be avoided.

[0081] In one optional embodiment, there are two first adhesive layers 161 and one second adhesive layer 162.

[0082] In this embodiment, by setting two first adhesive layers 161 located at both ends of the adhesive layer 160 and a first adhesive layer 161 located in the middle of the adhesive layer 160, the manufacturing process can be simplified while better mitigating the problem of easy film cracking and wiring breakage in the bending area D of the display module 10 when subjected to external forces. For the foldable display module 20, the slippage problem between the support layer 150 and the display panel 140 can be better mitigated during folding or unfolding.

[0083] Figure 9 This application provides further embodiments. Figure 1a A schematic cross-sectional view of the structure at section A-A'. Figure 10 This application Figure 9 A schematic diagram of the unfolded structure of the middle bend 143. As an optional embodiment, refer to... Figures 9-10 The first adhesive layer 161 includes a first sub-adhesive layer 1611 and a second sub-adhesive layer 1612. The first sub-adhesive layer 1611 is bonded to the end of the first support layer 151 near the bending portion 143, and the second sub-adhesive layer 1612 is bonded to the end of the second support layer 152 near the bending portion 143. Multiple second adhesive layers 162 and first adhesive layers 161 are alternately disposed between the first sub-adhesive layer 1611 and the second sub-adhesive layer 1612, such as... Figures 9-10 As shown, the first adhesive layer 161 further includes a third sub-adhesive layer 1613, and a plurality of second adhesive layers 162 and third adhesive layers 190 are alternately disposed between the first sub-adhesive layers 1611 and the second sub-adhesive layers 1612. The adhesive layer further includes a third adhesive layer 190, which covers the surface of the first adhesive layers 161 and the second adhesive layers 162 located between the first sub-adhesive layers 1611 and the second sub-adhesive layers 1612 that is away from the display panel 140; wherein, the elastic modulus of the third adhesive layer 190 is greater than the elastic modulus of the first adhesive layer 161 and the second adhesive layer 162.

[0084] In this embodiment, by providing a full-length high-modulus third adhesive layer 190 between the low-modulus first sub-adhesive layer 1611 and the second sub-adhesive layer 1612, and by having the third adhesive layer 190 cover the first adhesive layer 161 located in the middle, the integrity of the adhesive layer away from the surface of the bending portion 143 can be further improved, thereby improving the support of the adhesive layer 160 for the bending portion 143.

[0085] As an optional embodiment, refer to Figures 9-10 The material of the third adhesive layer 190 is the same as that of the second adhesive layer 162.

[0086] In this embodiment, by setting the material of the third adhesive layer 190 to be the same as that of the second adhesive layer 162, the interface compatibility between the second adhesive layer 162 and the third adhesive layer 190 is excellent, the interlayer bonding force is strong, the interlayer bonding strength is significantly improved, and the delamination, detachment and lifting of the adhesive layers are effectively avoided.

[0087] As an optional embodiment, refer to Figures 9-10 The third adhesive layer 190 and the second adhesive layer 162 are an integrated structure.

[0088] In this embodiment, the third adhesive layer 190 and the second adhesive layer 162 are an integrated structure, which eliminates the interlayer interface between the second adhesive layer 162 and the third adhesive layer 190, completely avoiding the risk of interface debonding and delamination. At the same time, it can achieve the integrity of the adhesive layer 160 away from the surface of the bending portion 143, thereby improving the support of the adhesive layer 160 for the bending portion 143. In addition, when subjected to external forces, the stress transmission is more continuous and smooth, and there is no problem of interface stress concentration.

[0089] In one embodiment, refer to Figures 6-10 The display module 10 also includes a composite layer 200, which is located between the first support layer 151 and the second support layer 152. The first support layer 151, the bending portion 143, the composite layer 200, the first support layer 151 and the composite layer 200 constitute an accommodating space. The ratio of the volume of the adhesive layer 160 to the volume of the accommodating space is V, which satisfies 90%≥V≥70%.

[0090] In this embodiment, after the adhesive material layer is prepared, the display module 10 needs to be bent and bound during the preparation process. After bending, the adhesive layer 160 will be squeezed towards the middle area. In this way, the adhesive layer 160 basically fills the accommodation space formed after the display module 10 is bent and bound, so that the accommodation space is minimized and the strength of the frame area of ​​the display module 10 is improved.

[0091] As an optional embodiment, refer to Figures 6-10 The composite layer 200 includes a composite buffer layer 201 and a padding layer 202 that are stacked sequentially along the direction away from the display section 141.

[0092] In this embodiment, the impact resistance of the display module 10 can be improved by setting a composite buffer layer 201. The composite buffer layer 201 can be a composite copper foil, which increases the heat dissipation capacity of the display module 10. By setting a padding layer 202, the display module 10 can be supported near the bending area D, and the relative position of the bending area D of the display module 10 can be fixed.

[0093] In one optional embodiment, the display module 10 further includes a polarizing layer 210, an adhesive layer 220 and a cover plate 230 stacked sequentially along the direction away from the display section 141; In this embodiment, by setting the polarizing layer 210, the display contrast and image quality of the display module 10 can be improved. The adhesive layer 220 is used to bond and fix the cover plate 230 and the polarizing layer 210. At the same time, since the cover plate 230 is located on the outermost side of the display module 10, it can resist external scratches, squeezing and drop impacts, and can effectively protect the underlying polarizing layer 210 and display panel 140 and other film layers from being scratched or cracked.

[0094] In an optional embodiment, the display module 10 further includes a protective layer 240 corresponding to the bent portion 143, and the protective layer 240 is disposed on the same layer as the polarizing layer 210. Furthermore, the display module 10 includes a display area AA and a non-display area NA. The bent portion 143 of the display panel 140 is located in the non-display area NA, and a portion of the display portion 141 and the bonding portion 142 of the display panel 140 are located in the display area AA and a portion is located in the non-display area NA.

[0095] In this embodiment, the above-described configuration improves the environmental resistance and impact resistance of the bent portion 143.

[0096] Figure 11 This is a flowchart illustrating a manufacturing method for a display module 10 provided in an embodiment of this application. Figures 12 to 14 This is a schematic diagram of a manufacturing process for a display module 10 provided in an embodiment of this application.

[0097] Figures 12 to 14 This is a schematic diagram illustrating a manufacturing process of a display module according to an embodiment of this application. A second aspect of this application provides a method for preparing a display module 10, which includes the following steps.

[0098] S100: A display panel 140 is provided, which includes a display section 141, a binding section 250, and a bending section 260 located between the display section 141 and the binding section 250.

[0099] Reference Figure 12 The display panel 140 also includes a display side B and a non-display side C that are disposed opposite to each other.

[0100] S200: A first support layer 151 and a second support layer 152 are formed on the backlight side of the display panel 140. An opening 270 is formed between the first support layer 151 and the second support layer 152, and the opening 270 is correspondingly provided with respect to the portion 260 to be bent. See details. Figure 13 .

[0101] S300: An adhesive material layer comprising a plurality of first adhesive material layers 280 and at least one second adhesive material layer 290 is formed in the opening 270. The first adhesive material layers 280 and the second adhesive material layers are spaced apart and the elastic modulus of the first adhesive material layers 280 and the elastic modulus of the second adhesive material layers 290 are different. The two ends of the adhesive material layer are respectively bonded to the first support layer 151 and the second support layer 152. Reference Figure 14 In step S300, multiple first adhesive material layers 280 can be prepared first, and then at least one second adhesive material layer 290 can be prepared. It should be noted that the first adhesive material layer 280 is formed by preparing the first adhesive, and the second adhesive material layer 290 is formed by preparing the second adhesive.

[0102] S400: Bend the display panel 140 so that the part to be bent 260 forms a bent part 143.

[0103] S500: The first adhesive material layer 280 and the second adhesive material layer 290 are cured to obtain the first adhesive layer 161 and the second adhesive layer 162.

[0104] Reference Figure 4 It should be noted that step S400 also includes binding the part to be bound 250 to form the binding part 142. At the same time, since the adhesive material layer is squeezed during the bending of the display panel 140, the adhesive material layer corresponding to the bending part 143 will become thicker in the middle and thinner at both ends.

[0105] In an optional embodiment, step S300, which involves preparing a plurality of first adhesive material layers 280 and at least one second adhesive material layer 290 in the opening 270, includes: preparing a first sub-adhesive material layer 281 and a second sub-adhesive material layer 282 at the ends of the first support layer 151 and the second support layer 152 near the opening 270, respectively; and preparing the second adhesive material layer 290 in the opening 270.

[0106] Reference Figure 14 In one optional embodiment, a portion of the first sub-adhesive material layer 281 is bonded to the surface of the first support layer 151 away from the display portion 141; and / or, a portion of the second sub-adhesive material layer 282 is bonded to the surface of the second support layer 152 away from the portion to be bonded 250. This effectively increases the contact area between the first sub-adhesive material layer 281 and the first support layer 151, and between the second sub-adhesive material layer 282 and the second support layer 152, preventing interface debonding and warping failure caused by only end-to-end bonding between the adhesive material layers and the first and second support layers 151 and 152.

[0107] In an optional embodiment, the method of preparing a plurality of first adhesive material layers 280 and at least one second adhesive material layer 290 in the opening 270 in step S300 includes: preparing a plurality of first adhesive material layers 280 and at least one second adhesive material layer 290 using a piezoelectric valve or a pneumatic dispensing valve.

[0108] In one optional embodiment, step S500 includes curing the first adhesive material layer 280 and the second adhesive material layer 290 by means of ultraviolet curing or heat curing.

[0109] It should be noted that when the first and second adhesives are thermosetting adhesives, the first adhesive material layer 280 and the second adhesive material layer 290 are cured using a thermosetting method. When the first and second adhesives are UV-curing adhesives, the first adhesive material layer 280 and the second adhesive material layer 290 are cured using a UV-curing method.

[0110] Figure 15 This is a top view schematic diagram of a display device 40. (Refer to...) Figure 15 In a third aspect, this application provides a display device 40, which includes the display module 10 described above, or the display module 10 prepared by the preparation method described above.

[0111] It should be noted that the display device 40 may be, but is not limited to, a foldable display device.

[0112] Display device 40 can be a mobile or fixed terminal with a display panel 140, such as a mobile phone, television, tablet computer, laptop computer, Ultra-Mobile Personal Computer (UMPC), Personal Digital Assistant (PDA), navigation device, smartwatch, virtual reality device, etc.

[0113] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0114] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A display module, characterized by include: The display panel includes a display section, a mounting section, and a bent section located between the display section and the mounting section; A support layer is located between the display part and the bonding part, and the support layer includes a first support layer disposed corresponding to the display part and a second support layer disposed corresponding to the bonding part; An adhesive layer, at least a portion of which is located in the bending space enclosed by the bending portion, wherein both ends of the adhesive layer are bonded to the first support layer and the second support layer, respectively; the adhesive layer includes a plurality of first adhesive layers and at least one second adhesive layer, wherein the elastic modulus of the first adhesive layer is different from that of the second adhesive layer, and the plurality of first adhesive layers and at least one second adhesive layer are alternately arranged.

2. The display module according to claim 1, characterized in that, The number of the first adhesive layers is greater than the number of the second adhesive layers; Preferably, the elastic modulus of the first adhesive layer is less than that of the second adhesive layer; Preferably, the first adhesive layer includes a first sub-adhesive layer and a second sub-adhesive layer, the first sub-adhesive layer is bonded to the end of the first support layer near the bending portion, and the second sub-adhesive layer is bonded to the end of the second support layer near the bending portion; Wherein, a portion of the first sub-adhesive layer is bonded to the surface of the first support layer away from the display portion; and / or, a portion of the second sub-adhesive layer is bonded to the surface of the second support layer away from the bonding portion; Preferably, a portion of the first sub-adhesive layer is bonded to the surface of the first support layer away from the display portion; along a direction parallel to the display portion and pointing towards the bonding portion, the width of the first sub-adhesive layer located on the surface of the first support layer away from the display portion is d1, satisfying 0.1mm≥d1≥0.05mm; Preferably, a portion of the second sub-adhesive layer is bonded to the surface of the second support layer away from the bonding portion; along a direction parallel to the display portion pointing towards the bonding portion, the width of the second sub-adhesive layer located on the surface of the second support layer away from the display portion is d2, satisfying 0.1mm≥d2≥0.05mm; Preferably, a portion of the first sub-adhesive layer is bonded to the surface of the first support layer away from the display portion, and a portion of the second sub-adhesive layer overlaps the surface of the second support layer away from the bonding portion. Along a direction parallel to the display portion and pointing towards the bending portion, the width of the first sub-adhesive layer is equal to the width of the second sub-adhesive layer.

3. The display module according to claim 1, characterized in that, The first adhesive layer includes a first sub-adhesive layer and a second sub-adhesive layer. The first sub-adhesive layer is bonded to the end of the first support layer near the bending portion, and the second sub-adhesive layer is bonded to the end of the second support layer near the bending portion. The first sub-adhesive layer and the second sub-adhesive layer have the same elastic modulus; Preferably, at least a portion of the first adhesive layer has the same elastic modulus; Preferably, the elastic modulus of each of the first adhesive layers is the same; Preferably, the adhesive layer comprises a plurality of second adhesive layers, and at least a portion of the second adhesive layers have the same elastic modulus; Preferably, the elastic modulus of each of the second adhesive layers is the same.

4. The display module according to claim 1, characterized in that, The first adhesive layer is formed by curing a first adhesive, and the second adhesive layer is formed by curing a second adhesive; at least some components of the first adhesive and the second adhesive are of the same type of material; Preferably, the components of the first adhesive and the second adhesive are made of the same type of material; Preferably, the bonding strength between the first adhesive layer and the second adhesive layer is σ1, which satisfies σ1≥20mPa; Preferably, the thixotropic index of the first adhesive is ≥4; and / or, the thixotropic index of the second adhesive is ≥4; Preferably, the materials of the first adhesive and the second adhesive include any one of acrylic materials, epoxy materials, and silicone materials.

5. The display module according to claim 1, characterized in that, The display panel includes a substrate and a light-emitting structure layer stacked together, and the adhesive layer is bonded to the substrate; Wherein, the bonding strength between the adhesive layer and the substrate is σ2, and the bonding strength between the adhesive layer and the support layer is σ3; satisfying σ2≥20mPa; and / or, satisfying σ3≥20mPa; Preferably, the elastic modulus of the first adhesive layer is E1, which satisfies E1≤50mPa; Preferably, the elongation at break of the first adhesive layer is ε1, which satisfies ε1≥200%; Preferably, the elastic modulus of the second adhesive layer is E2, which satisfies E2≥500mPa.

6. The display module according to claim 1, characterized in that, The surface of the adhesive layer opposite to the bend is a smooth curved surface; Preferably, the sum of the number of the first adhesive layer and the second adhesive layer is an odd number, and the number of the first adhesive layer is greater than the number of the second adhesive layer; Preferably, the sum of the number of the first adhesive layer and the second adhesive layer is ≤7; Preferably, there are two first adhesive layers and one second adhesive layer. Preferably, the first adhesive layer includes a first sub-adhesive layer and a second sub-adhesive layer, the first sub-adhesive layer is bonded to the end of the first support layer near the bend, and the second sub-adhesive layer is bonded to the end of the second support layer near the bend; a plurality of second adhesive layers and the first adhesive layer are alternately disposed between the first sub-adhesive layer and the second sub-adhesive layer, and the adhesive layer further includes a third adhesive layer, the third adhesive layer covering the surface of the first adhesive layer and the second adhesive layer located between the first sub-adhesive layer and the second sub-adhesive layer away from the display panel; The elastic modulus of the third adhesive layer is greater than that of the elastic modulus of the first adhesive layer and the elastic modulus of the second adhesive layer. Preferably, the material of the third adhesive layer is the same as the material of the second adhesive layer; Preferably, the third adhesive layer and the second adhesive layer are an integral structure.

7. The display module according to any one of claims 1 to 6, wherein The display module also includes: A composite layer is located between the first support layer and the second support layer. The first support layer, the bending portion, the composite layer, the first support layer, and the composite layer constitute a receiving space. The ratio of the volume of the adhesive layer to the volume of the receiving space is V, which satisfies 90% ≥ V ≥ 70%. Preferably, the composite layer includes a composite buffer layer and a padding layer stacked sequentially along the direction away from the display portion; Preferably, the display module further includes a polarizing layer, an adhesive layer, and a cover plate that are sequentially stacked along the direction away from the display section; Preferably, the display module further includes a protective layer corresponding to the bent portion, and the protective layer is disposed in the same layer as the polarizing layer.

8. A method for manufacturing a display module, characterized by, include: A display panel is provided, the display panel including a display part, a part to be bound, and a part to be bent located between the display part and the part to be bound; A first support layer and a second support layer are formed on the backlight side of the display panel, and an opening is formed between the first support layer and the second support layer, the opening being provided corresponding to the part to be bent. An adhesive material layer comprising a plurality of first adhesive material layers and at least one second adhesive material layer is formed in the opening. The first adhesive material layer and the second adhesive material layer are spaced apart and the elastic modulus of the first adhesive material layer and the elastic modulus of the second adhesive material layer are different. The two ends of the adhesive material layer are respectively bonded to the first support layer and the second support layer. The display panel is bent so that the part to be bent forms a bent part; The first adhesive material layer and the second adhesive material layer are cured to obtain a first adhesive layer and a second adhesive layer.

9. The preparation method according to claim 8, characterized in that, The step of preparing a plurality of first adhesive material layers and at least one second adhesive material layer in the opening includes: preparing a first sub-adhesive material layer and a second sub-adhesive material layer at the ends of the first support layer and the second support layer near the opening, respectively; The second adhesive material layer is prepared in the opening; Preferably, the method for preparing a plurality of first adhesive material layers and at least one second adhesive material layer in the opening includes: preparing a plurality of first adhesive material layers and at least one second adhesive material layer using a piezoelectric valve or a pneumatic dispensing valve; Preferably, the method for curing the first adhesive material layer and the second adhesive material layer to obtain the first adhesive layer and the second adhesive layer includes: curing the first adhesive material layer and the second adhesive material layer by means of ultraviolet curing or heat curing.

10. A display device, characterized by comprising: The display module includes the display module according to any one of claims 1-7, or the display module prepared by the preparation method according to any one of claims 8-9.

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