Display module, manufacturing method and display device

Abstract

This application provides a display module, manufacturing method, and display device. The display module includes a display panel, a composite functional layer, and a first adhesive. The display panel includes a curved portion and a flat portion. The composite functional layer is disposed on the backlight side of the display panel and includes a heat dissipation layer and a buffer layer. The buffer layer is located between the heat dissipation layer and the display panel. The elastic coefficient of the heat dissipation layer is smaller than that of the buffer layer. The composite functional layer includes a first region and a second region. The first region is adapted to the curved portion, and the second region is adapted to the flat portion. The first adhesive is located between the composite functional layer and the display panel. The first adhesive includes an initial state and a bonded state. The adhesiveness of the first adhesive in the initial state is smaller than that in the bonded state. In the first region, the composite functional layer is bonded to the first adhesive in the bonded state. This application aims to improve the problem of incomplete bonding between the film layers within the composite functional layer in existing display modules.

Description

[Technical Field]

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

[0002] To meet consumer demand and increase the screen-to-body ratio of display modules, more and more display panels are adopting curved structures.

[0003] To improve the performance of the display panel in a display module, a composite functional layer (super clean foam, SCF) is typically applied to the backlight side of the display panel. During the process of applying the composite functional layer to the backlight side of the display panel, splits can occur between some of the film layers within the composite functional layer, resulting in incomplete adhesion and affecting the performance and lifespan of the display module. [Summary of the Invention]

[0004] In view of this, embodiments of this application provide a display module, a manufacturing method, and a display device to improve the problem of poor bonding between internal film layers of the composite functional layer in existing display modules.

[0005] In a first aspect, embodiments of this application provide a display module, including: a display panel, a composite functional layer, and a first adhesive; wherein the display panel includes a curved portion and a flat portion. The composite functional layer is disposed on the backlight side of the display panel, and includes a heat dissipation layer and a buffer layer, with the buffer layer located between the heat dissipation layer and the display panel; the elastic coefficient of the heat dissipation layer is less than that of the buffer layer; the composite functional layer includes a first region and a second region, the first region being adapted to the curved portion, and the second region being adapted to the flat portion. The first adhesive is located between the composite functional layer and the display panel; the first adhesive includes an initial state and an adhered state, the adhesiveness of the first adhesive in the initial state being less than that in the adhered state; in the first region, the composite functional layer is adhered to the first adhesive in the adhered state.

[0006] Secondly, embodiments of this application provide a method for manufacturing a display module according to the first aspect, comprising:

[0007] The first adhesive, in its initial state, is applied to the side of the composite functional layer facing the display panel, and the first adhesive is located in the first area;

[0008] The composite functional layer and the display panel are aligned so that the first area corresponds to the curved part and the second area corresponds to the flat part; and the first adhesive is brought into contact with the backlight side of the display panel.

[0009] The composite functional layer is bonded to the display panel, with the first area of ​​the composite functional layer attached to the curved part of the display panel and the second area of ​​the composite functional layer attached to the flat part of the display panel.

[0010] In one implementation of the second aspect, the composite functional layer includes at least one groove facing an opening in the display panel within a first region; the first adhesive located within the first region includes:

[0011] The first adhesive, in its initial state, is attached to the groove in the first region, and the first adhesive at least partially covers the opening of the groove.

[0012] Thirdly, embodiments of this application provide a display device, which includes the display module of the first aspect.

[0013] In this embodiment, the first adhesive is disposed between the composite functional layer and the display panel, which can effectively prevent the composite functional layer from making premature contact with the backlight side of the display panel. This allows the end of the composite functional layer to be in a free state during the roller attachment process, thus enabling the end of the composite functional layer to be attached to the target position. This ensures that the deformation difference of the internal film layers of the composite functional layer is within the allowable range, and ultimately reduces the probability of splitting and gaps between the internal film layers of the composite functional layer. [Attached Image Description]

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram illustrating the bonding of a composite functional layer to a display panel using existing technology.

[0016] Figure 2 This is a schematic diagram showing the bonding of the composite functional layer to the display panel using existing technology;

[0017] Figure 3 This is a schematic diagram of the structure of a display module provided in an embodiment of this application;

[0018] Figure 4 This is a schematic diagram of the structure of a display module provided in an embodiment of this application;

[0019] Figure 5 A schematic diagram illustrating a partial attachment process of a display module according to an embodiment of this application;

[0020] Figure 6 A schematic diagram illustrating a partial attachment process of a display module according to an embodiment of this application;

[0021] Figure 7This is a partial structural diagram of a display module provided in an embodiment of this application;

[0022] Figure 8 This is a partial structural diagram of a display module provided in an embodiment of this application;

[0023] Figure 9 A cross-sectional view of a composite functional layer provided in an embodiment of this application;

[0024] Figure 10 A cross-sectional view of a composite functional layer provided in an embodiment of this application;

[0025] Figure 11 This is a schematic diagram of the structure of a buffer layer provided in an embodiment of this application;

[0026] Figure 12 This is a schematic diagram of the structure of a buffer layer provided in an embodiment of this application;

[0027] Figure 13 A cross-sectional view of the buffer layer provided in the embodiments of this application;

[0028] Figure 14 A flowchart illustrating the manufacturing method provided in the embodiments of this application;

[0029] Figure 15 This is a schematic diagram of the structure of the buffer layer and the first adhesive in its initial state provided in an embodiment of this application;

[0030] Figure 16 This is a schematic diagram of a display device provided in an embodiment of this application.

[0031] Label Explanation

[0032] 100, Display module; 110, Display panel; B1, Curved part; B2, Flat part; 120, Composite functional layer; 121, Heat dissipation layer; 122, Buffer layer; 122a, Foam layer; 122b, Second adhesive; C1, First area; C2, Second area; 130, First adhesive; 140, Cover plate; 150, Groove.

Detailed Implementation Methods

[0033] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0034] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0035] 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.

[0036] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0037] In the description of this specification, it should be understood that the terms "substantially", "approximately", "about", "about", "generally", "largely" used in the claims and embodiments of this application refer to values ​​that can be generally agreed upon within a reasonable range of process operations or tolerances, rather than a precise value.

[0038] It should be understood that although terms such as first, second, third, etc., may be used to describe regions in the embodiments of this application, these regions should not be limited to these terms. These terms are only used to distinguish regions from each other. For example, without departing from the scope of the embodiments of this application, a first region may also be referred to as a second region, and similarly, a second region may also be referred to as a first region.

[0039] Through meticulous and in-depth research, the applicant in this case has provided a solution to the problems existing in the prior art.

[0040] Figure 1 This is a schematic diagram illustrating the bonding of a composite functional layer to a display panel using existing technology. Figure 2 This is a schematic diagram showing the bonding of the composite functional layer to the display panel using existing technology.

[0041] Please see Figure 1 and Figure 2The inventors discovered that the gaps and loose adhesion between the internal film layers of the composite functional layer 120 are caused by the significant difference in elastic coefficients between the internal film layers (e.g., between the heat dissipation layer 121 and the buffer layer 122). Specifically, when attaching the composite functional layer to the display panel using existing technology, during the bonding of a portion of the composite functional layer 120 to the planar area of ​​the display panel, the end of the composite functional layer 120 may prematurely contact and adhere to the curved surface of the display panel. Consequently, the film layers with different elastic coefficients in the composite functional layer 120 deform differently during the pressure holding process, resulting in gaps between the film layers with different elastic coefficients in the composite functional layer 120. For example, the elastic modulus of the buffer layer 122 (e.g., including Foma adhesive and / or Embo adhesive) in the composite functional layer 120 is greater than that of the heat dissipation layer 121 (e.g., copper foil). When the composite functional layer 120 is pressed with the curved surface B1 of the display panel 110, the deformation of the buffer layer 122 is greater than the preset value because the end of the composite functional layer 120 is bonded to the curved surface of the display panel in advance, while the deformation of the heat dissipation layer 121 is very small. The large difference between the deformation of the buffer layer 122 and the heat dissipation layer 121 leads to gaps between them, and the buffer layer 122 may even break.

[0042] Figure 3 This is a schematic diagram of the structure of a display module provided in an embodiment of this application.

[0043] Please see Figure 3 This application provides a display module 100, including: a display panel 110, a composite functional layer 120, and a first adhesive 130; wherein, the display panel 110 includes a curved portion B1 and a flat portion B2. The composite functional layer 120 is disposed on the backlight side of the display panel 110, and the composite functional layer 120 includes a heat dissipation layer 121 and a buffer layer 122, the buffer layer 122 being located between the heat dissipation layer 121 and the display panel 110; the elastic coefficient of the heat dissipation layer 121 is smaller than the elastic coefficient of the buffer layer 122; the composite functional layer 120 includes a first region C1 and a second region C2, the first region C1 being adapted to the curved portion B1, and the second region C2 being adapted to the flat portion B2. The first adhesive 130 is located between the composite functional layer 120 and the display panel 110; the first adhesive 130 includes an initial state and an adhered state, and the adhesiveness of the first adhesive 130 in the initial state is less than that in the adhered state; in the first region C1, the composite functional layer 120 is adhered to the first adhesive 130 in the adhered state.

[0044] The display module 100 may further include a cover plate 140, which is located on the light-emitting side of the display panel 110. The cover plate 140 is a curved cover plate, which can be used to protect the display panel 110 and maintain the curved shape of the display panel 110, thereby realizing a curved display. The display panel 110 can be an organic light-emitting display panel, that is, the display panel 110 includes organic light-emitting display devices.

[0045] The first adhesive 130 has two states: an initial state and an adhered state. The adhesiveness of the first adhesive 130 in the initial state is less than that in the adhered state. Before the composite functional layer 120 is adhered to the display panel 110, the first adhesive 130 is in the initial state with lower adhesiveness, and at this time, the first adhesive is located between the curved surface of the display panel 110 and the first region C1 of the composite functional layer 120. The first adhesive 130 ensures that the first region C1 of the composite functional layer 120 and the curved surface B1 of the display panel 110 do not come into premature contact before the first region C1 is adhered to the curved surface B1 of the display panel 110; or the first region C1 of the composite functional layer 120 and the curved surface B1 of the display panel 110 may come into premature contact through the first adhesive 130. However, because the adhesiveness of the first adhesive 130 is lower, the position in the first region C1 of the composite functional layer 120 that contacts the curved surface B1 of the display panel 110 can still be considered a free end.

[0046] During the process of bonding the first region C1 of the composite functional layer 120 to the curved surface B1 of the display panel 110, the first adhesive 130 changes from the initial state to the bonding state. The adhesive 130 in the bonding state has greater adhesion and can bond the composite functional layer 120 and the display panel 110 together.

[0047] Therefore, the first adhesive 130 enables the end of the composite functional layer 120 to naturally adhere to the display panel 110 along the attachment curve, thereby ensuring that the deformation difference of each layer 120 of the composite functional layer is within the allowable range, and ultimately reducing the probability of splitting and gaps between the layers of the composite functional layer 120.

[0048] The first adhesive 130 can be a pressure-sensitive adhesive, and the color of the pressure-sensitive adhesive can be black, to maintain consistency with the mesh adhesive of the buffer layer 122 of the composite functional layer 120. The material of the first adhesive 130 can be an acrylic type or an organosilicon type with chemical resistance.

[0049] Figure 4 This is a schematic diagram of the structure of a display module provided in an embodiment of this application; Figure 5 A schematic diagram illustrating a partial attachment process of a display module according to an embodiment of this application; Figure 6 A schematic diagram illustrating a partial attachment process of a display module according to an embodiment of this application; Figure 7 This is a partial structural diagram of a display module provided in an embodiment of this application.

[0050] Please see Figures 4 to 6 In one embodiment of this application, the composite functional layer 120 includes at least one groove 150 opening toward the display panel 110 within the first region C1. The groove 150 is capable of holding at least a portion of the first adhesive 130 to reduce the impact of the first adhesive 130 on the overall thickness of the display module 100.

[0051] During the process of attaching the composite functional layer 120 to the display panel 110, the opening of the groove 150 can open with the deformation of the buffer layer 122, thereby effectively reducing the deformation of the buffer layer 122, and further reducing the difference between the deformation of the buffer layer 122 and the heat dissipation layer 121, so as to alleviate the risk of splitting when the buffer layer 122 and the heat dissipation layer 121 are attached together.

[0052] In one embodiment of this application, please refer to Figure 4 or Figure 7 The groove 150 can also accommodate at least a portion of the first adhesive 130, thereby effectively reducing the impact of the first adhesive 130 on the thickness of the display module 100.

[0053] Figure 8 This is a partial structural diagram of a display module provided in an embodiment of this application.

[0054] Please see Figure 7 and Figure 8 In one embodiment of this application, the first adhesive 130 is at least partially located within the groove 150. The first adhesive 130 being located within the groove 150 serves two purposes: firstly, it allows the composite functional layer 120 within the groove 150 area to be bonded to the display panel 110 via the first adhesive 130, preventing misalignment; secondly, the first adhesive 130 fills the groove 150, preventing collapse.

[0055] Please see Figure 8 In one embodiment, the first adhesive 130 is completely located within the groove 150. This complete placement within the groove 150 prevents both incomplete application and collapse, and also prevents the first adhesive 130 from overflowing the groove 150 and affecting the thickness of the display module 100.

[0056] Please see Figure 7In one embodiment of this application, a portion of the first adhesive 130 is located within the groove 150, and another portion of the first adhesive 130 is located between the display panel 110 and the buffer layer 122. The portion of the first adhesive 130 located within the groove 150 can prevent incomplete adhesion and collapse, while the portion of the first adhesive 130 located between the display panel 110 and the buffer layer 122 can bond the buffer layer 122 and the display panel 110 together. This technical solution is easy to implement and can effectively reduce manufacturing costs.

[0057] Please see Figure 7 or Figure 8 In one embodiment of this application, the buffer layer 122 includes a foam layer 122a and a second adhesive 122b, with the second adhesive 122b located between the foam layer 122a and the display panel 110. In the second region C2, the composite functional layer 120 and the display panel 110 are bonded together by the second adhesive. It should be noted that the initial adhesive strength of the first adhesive 130 is less than that of the second adhesive 122b. The second adhesive 122b is partially located in the first region C1. The second adhesive 122b is partially located in the second region. In the first region C1, where the first adhesive 130 is present, the display panel 110 and the composite functional layer 120 are bonded together by the first adhesive 130 in a bonded state. In the first region C1, where the first adhesive 130 is not present, the display panel 110 and the composite functional layer 120 are bonded together by the second adhesive 122b.

[0058] Figure 9 A cross-sectional view of a composite functional layer provided in an embodiment of this application; Figure 10 This is a cross-sectional view of a composite functional layer provided in an embodiment of this application.

[0059] Please see Figure 4 , Figure 5 , Figure 9 and Figure 10 In one embodiment of this application, the minimum distance between the bottom of the groove 150 and the heat dissipation layer 121 is greater than or equal to zero. Figure 4 and Figure 9 The distance between the groove 150 and the heat dissipation layer 121 is zero. Figure 5 and Figure 10 The distance between the groove 150 and the heat dissipation layer 121 is greater than zero. The minimum distance between the bottom of the groove 150 and the heat dissipation layer 121 is greater than or equal to zero, which ensures that the space of the groove can accommodate the first adhesive while ensuring that the heat dissipation of the heat dissipation layer is not affected.

[0060] In one implementation of this embodiment, please refer to Figure 4The distance between the bottom of the groove 150 and the heat dissipation layer 121 is zero, that is, the bottom of the groove 150 exposes the heat dissipation layer 121. This maximizes the depth of the groove 150 without affecting the structure of the heat dissipation layer 121. The greater the depth of the groove 150, the less the difference in deformation between the heat dissipation layer 121 and the buffer layer 122 during the pressure holding process, thereby more effectively preventing splitting between the heat dissipation layer 121 and the buffer layer 122.

[0061] In one implementation of this embodiment, please refer to Figure 9 In one embodiment of this application, the groove 150 penetrates the buffer layer 122. The groove 150 penetrating the buffer layer 122 can effectively reduce the process difficulty in manufacturing the groove 150, and can effectively reduce the difference in deformation between the heat dissipation layer 121 and the buffer layer 122 during the pressure holding process.

[0062] In one implementation of this embodiment, please refer to Figure 5 The minimum distance between the bottom of the groove 150 and the heat dissipation layer 121 is greater than zero, that is, the first adhesive 130 does not contact the heat dissipation layer 121, so as to ensure the heat dissipation effect of the heat dissipation layer 121.

[0063] In one implementation of this embodiment, please refer to Figure 10 The groove 150 is located in the buffer layer 122 at a depth less than the thickness of the buffer layer 122. The shallow depth of the groove 150 in the buffer layer 122 ensures the heat dissipation effect of the heat dissipation layer 121. On the other hand, the shallow depth of the groove 150 facilitates the first adhesive 130 to fill the groove 150, thereby preventing air bubbles or gaps from appearing between the wall of the groove 150 and the first adhesive 130.

[0064] Figure 11 This is a schematic diagram of a buffer layer provided in an embodiment of this application.

[0065] Please see Figure 11In one embodiment of this application, the first region C1 of the composite functional layer 120 includes a plurality of grooves 150 arranged in a straight line. During the silicone pressure holding process, the first adhesive 130 needs to be attached to the grooves 150. The linear arrangement of the grooves 150 ensures that the corresponding first adhesive 130 is also linearly aligned. This ensures that the distance between the edge near the first adhesive 130 and the first adhesive 130 is similar. Therefore, when the first region C1 of the composite functional layer 120 is bonded to the curved surface B1 of the display panel 110, the overall force at the edge of the composite functional layer 120 is relatively uniform, which is beneficial to improving the bonding effect. On the other hand, it ensures that the force application points on the first adhesive 130 are located in the same straight line, reducing the difficulty of the process. At the same time, the width of the second region C2 is small, and the linear arrangement of the grooves 150 can effectively reduce the difficulty of the manufacturing process.

[0066] Please see Figure 11 In one embodiment of this application, the first region C1 and the second region C2 of the composite functional layer 120 are arranged along the first direction X. Among the plurality of grooves 150, along the second direction Y, the maximum distance between adjacent grooves 150 is a first threshold A, wherein the first direction X is perpendicular to the second direction Y. B is the width of the groove 150 along the second direction Y, ε1 is the viscosity coefficient of the first adhesive 130, and ε2 is the viscosity coefficient of the second adhesive 122b. The maximum distance between adjacent grooves 150 is the first threshold, which can effectively reduce the splitting between the buffer layer 122 and the heat dissipation layer 121 in the area between adjacent grooves 150.

[0067] Figure 12 This is a schematic diagram of a buffer layer provided in an embodiment of this application. Figure 13 This is a cross-sectional view of the buffer layer provided in an embodiment of this application.

[0068] Please see Figures 11 to 13 In one embodiment of this application, the shape of the groove 150 can be at least one of a cuboid, a cube, a cylinder, or a dovetail groove. Furthermore, the shape of the groove 150 can also be other shapes. For example, as... Figure 11 As shown, the groove 150 is rectangular in shape. Figure 12 As shown, the groove 150 is cylindrical in shape. Figure 13 As shown, the groove 150 is shaped like a dovetail groove.

[0069] Figure 14 A flowchart illustrating the manufacturing method provided in this application embodiment.

[0070] Please see Figure 14 This application provides a method for manufacturing a display module 100, comprising:

[0071] The first adhesive 130 in its initial state is attached to the side of the composite functional layer 120 facing the display panel 110, and the first adhesive 130 is located in the first region C1;

[0072] The composite functional layer 120 is aligned with the display panel 110 so that the first region C1 corresponds to the curved part B1 and the second region C2 corresponds to the flat part B2; and the first adhesive 130 is brought into contact with the backlight side of the display panel 110.

[0073] The composite functional layer 120 is bonded to the display panel 110. The first region C1 of the composite functional layer 120 is attached to the curved part B1 of the display panel 110, and the second region C2 of the composite functional layer 120 is attached to the flat part B2 of the display panel 110.

[0074] In the manufacturing method provided in this application, during the alignment process between the composite functional layer 120 and the display panel 110, the first adhesive 130 is in its initial state, and the buffer layer 122 is separated from the display panel 110. The buffer layer 122 and the display panel 110 are separated by the first adhesive 130 in its initial state, thus effectively preventing the buffer layer 122 from prematurely contacting and adhering to the display panel 110.

[0075] In the embodiments of this application, during the process of attaching the first region C1 of the composite functional layer 120 to the curved surface B1 of the display panel 110, the first adhesive 130 in the initial state has low tack, which can effectively prevent the buffer layer 122 from contacting the display panel 110 in advance, thereby making the edge of the buffer layer 122 free. Therefore, the end of the composite functional layer 120 can be naturally attached to the display panel 110 along the attachment curve, effectively reducing the splitting between the buffer layer 122 and the heat dissipation layer 121.

[0076] Please see Figure 4 In one embodiment of this application, the composite functional layer 120 includes at least one groove 150 opening toward the display panel 110 within the first region C1; the first adhesive 130 located within the first region C1 includes: the first adhesive 130 in an initial state is attached to the groove 150 of the first region C1, and the first adhesive 130 at least partially covers the opening of the groove 150.

[0077] A groove 150 is provided in the first region C1 of the composite functional layer 120. Pressure-sensitive adhesive is applied to the groove 150 to prevent the buffer layer 122 from contacting the display panel 110. Before pressure is applied, the first adhesive 130 is in its initial state. In the initial state, the first adhesive 130 has very low tackiness and can effectively separate the display panel 110 from the buffer layer 122. Therefore, it effectively avoids the adhesive contact between the composite functional layer and the display panel 110, allowing the edge of the buffer layer 122 to be in a free state. During curved pressure application, the first region C1 of the composite functional layer 120 deforms, causing the opening of the groove 150 to open, and the first adhesive 130 to at least partially fill the groove 150. As the groove 150 opens, the first adhesive 130 becomes more viscous under pressure, filling the groove 150. This ensures the adhesion between the composite functional layer 120 and the display panel 110, and also improves the problem of loose adhesion between the layers of the composite functional layer 120.

[0078] In its initial state, the first adhesive 130 at least partially covers the groove 150, which can improve the performance of the display module. Specifically, the matching use of the groove 150 and the first adhesive 130 can ensure that the deformation difference between the heat dissipation layer 121 and the buffer layer 122 of the composite functional layer 120 is within the allowable range, and ultimately reduce the probability of splitting and gaps occurring between the internal film layers of the composite functional layer 120.

[0079] In one embodiment, the first adhesive 130 covers the opening of the groove 150. Covering the opening of the groove 150 with the first adhesive 130 facilitates the complete filling of the groove 150 after the composite functional layer 120 is bonded to the display panel 110, thereby effectively preventing gaps or air bubbles from existing inside the groove 150.

[0080] In one embodiment of this application, the shape of the first adhesive 130 in its initial state is similar to the shape of the groove 150. This can be understood as the first adhesive 130 being a solid with excellent elasticity and low viscosity in its initial state. The similarity in shape between the first adhesive 130 and the groove 150 in its initial state facilitates covering the groove 150.

[0081] Figure 15 This is a schematic diagram of the structure of the buffer layer and the first adhesive in the initial state provided in the embodiments of this application.

[0082] Please see Figure 15 In one embodiment of this application, the first adhesive 130 being located within the first region C1 includes: the first adhesive 130 in its initial state being located within the first region C1 and having a minimum distance D1 from the edge of the composite functional layer 120 less than or equal to 0.5 mm. This distance ensures that the first adhesive 130 has good adhesion in the bonded state and does not overflow the edge of the buffer layer 122.

[0083] Please see Figure 15 In one embodiment of this application, the first region C1 and the second region C2 of the composite functional layer 120 are arranged along the first direction X. The maximum length L of the first adhesive 130 in the initial state along the second direction Y is less than or equal to 30 mm, and the first direction X is perpendicular to the second direction Y. Controlling the length of the first adhesive 130 in the initial state to within 30 mm ensures both the adhesiveness of the first adhesive 130 and prevents it from breaking during application.

[0084] Please see Figure 15 In one embodiment of this application, the curved surface B1 and the flat surface B2 are arranged along a first direction X. Along the first direction X, the maximum width D2 of the first adhesive 130 in the initial state is less than the width of the first region C1. The fact that the width of the first adhesive 130 along the first direction X is less than the width of the first region C1 along the first direction X effectively prevents the first adhesive 130 from overflowing the first region in the adhered state, thereby reducing the impact of the first adhesive 130 on the display module 100.

[0085] In one embodiment of this application, the first adhesive 130 located within the first region C1 includes the following: the thickness of the first adhesive 130 in its initial state is less than or equal to a second threshold, where the second threshold is the product of the thickness of the buffer layer 122 and the corresponding compression ratio. The corresponding compression ratio refers to the ratio of the deformation of the buffer layer 122 after it is subjected to a corresponding force (the corresponding force refers to a force whose magnitude and direction are equal to the force exerted on the composite functional layer 120 during the pressure holding stage) to its own thickness.

[0086] Figure 16 This is a schematic diagram of a display device provided in an embodiment of this application.

[0087] Please see Figure 16This application provides a display device 200, which includes a display module 100. The display device 200 can be a mobile phone, a computer, a smartwatch, a tablet, or other electronic devices. In the display device 200 provided in this application, the first adhesive 130 has two states: an initial state and an adhered state. The adhesiveness of the first adhesive 130 in the initial state is less than that in the adhered state. Before the composite functional layer 120 is adhered to the display panel 110, the first adhesive 130 is in the initial state with lower adhesiveness, and at this time, the first adhesive is located between the curved surface of the display panel 110 and the first region C1 of the composite functional layer 120. The first adhesive 130 prevents the first region C1 of the composite functional layer 120 from making premature contact with the curved surface B1 of the display panel 110 before the first region C1 is bonded to the curved surface B1 of the display panel 110; or, the first region C1 of the composite functional layer 120 may make premature contact with the curved surface B1 of the display panel 110 through the first adhesive 130, but because the adhesive of the first adhesive 130 is relatively weak, the position in the first region C1 of the composite functional layer 120 that contacts the curved surface B1 of the display panel 110 can still be considered a free end. During the bonding process of the first region C1 of the composite functional layer 120 to the curved surface B1 of the display panel 110, the first adhesive 130 changes from its initial state to a bonded state. In the bonded state, the adhesive of the first adhesive 130 is stronger, which can bond the composite functional layer 120 and the display panel 110 together.

[0088] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A display module, characterized in that, include: Display panel, including curved and flat sections; A composite functional layer is disposed on the backlight side of the display panel. The composite functional layer includes a heat dissipation layer and a buffer layer. The buffer layer is located between the heat dissipation layer and the display panel. The elastic coefficient of the heat dissipation layer is smaller than that of the buffer layer. The composite functional layer includes a first region and a second region. The first region is adapted to the curved surface, and the second region is adapted to the planar portion. A first adhesive is located between the composite functional layer and the display panel; the first adhesive includes an initial state and an adhered state, the adhesiveness of the first adhesive in the initial state is less than its adhesiveness in the adhered state; in the first region, the composite functional layer is adhered to the first adhesive in the adhered state; The buffer layer includes a second adhesive, wherein the adhesiveness of the first adhesive in its initial state is less than that of the second adhesive; in the second region, the display panel and the composite functional layer are bonded together by the second adhesive; in the first region, where the first adhesive is present, the display panel and the composite functional layer are bonded together by the first adhesive in a bonded state; in the first region, where the first adhesive is absent, the display panel and the composite functional layer are bonded together by the second adhesive.

2. The display module according to claim 1, characterized in that, The composite functional layer includes at least one groove in the first region that faces the opening of the display panel.

3. The display module according to claim 2, characterized in that, The first adhesive is at least partially located within the groove.

4. The display module according to claim 3, characterized in that, A portion of the first adhesive is located within the groove, and a portion of the first adhesive is located between the display panel and the buffer layer.

5. The display module according to claim 2, characterized in that, The minimum distance between the bottom of the groove and the heat dissipation layer is greater than or equal to zero.

6. The display module according to claim 2, characterized in that, The groove extends through the buffer layer.

7. The display module according to claim 2, characterized in that, The groove is located at a depth less than the thickness of the buffer layer.

8. The display module according to claim 2, characterized in that, The first region of the composite functional layer includes a plurality of grooves, which are arranged in a straight line.

9. The display module according to claim 2, characterized in that, The groove is at least one of the following shapes: cuboid, cylinder, or dovetail groove.

10. The display module according to claim 1, characterized in that, The buffer layer includes a foam layer, and the second adhesive is located between the foam layer and the display panel.

11. A method for manufacturing a display module according to any one of claims 1-10, characterized in that, include: The first adhesive, in its initial state, is applied to the composite functional layer on the side facing the display panel, and the first adhesive is located within the first area; The composite functional layer is aligned with the display panel so that the first area corresponds to the curved surface and the second area corresponds to the flat surface; and the first adhesive is brought into contact with the backlight side of the display panel. The composite functional layer is bonded to the display panel, with a first region of the composite functional layer attached to the curved surface of the display panel and a second region of the composite functional layer attached to the flat surface of the display panel.

12. The method according to claim 11, characterized in that, The composite functional layer includes at least one groove facing the opening of the display panel in the first region; the first adhesive in the first region includes: The first adhesive, in its initial state, is attached to the groove in the first region, and the first adhesive at least partially covers the opening of the groove.

13. The method according to claim 11, characterized in that, The first adhesive located in the first area includes: The first adhesive is located within the first area and the minimum distance from the edge of the composite functional layer is less than or equal to 0.5 mm.

14. A display device, characterized in that, The display device includes the display module according to any one of claims 1-10.

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