Adhesive film, preparation method thereof and display module

Abstract

The application provides a kind of adhesive film and its preparation method, display module.The adhesive film includes first adhesive part and at least one second adhesive part;First adhesive part has at least one annular groove;Each second adhesive part is arranged in an annular groove;Wherein, at least one second adhesive part is spaced along the center area of first adhesive part towards the edge direction;And the hardness of second adhesive part is less than the hardness of first adhesive part.The adhesive film is concave deformation under the stress of its center area, and the second adhesive part of the softer can absorb a part of the pulling force transmitted from the center area of the adhesive film to its edge, so that the pulling force received by the edge of the adhesive film is greatly reduced, thereby effectively reducing the probability of the occurrence of the problems of the peeling of the adhesive film and the cover plate, the bubbles between the adhesive film and the cover plate, and the appearance of the display module.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to an adhesive film, its preparation method, and a display module. Background Technology

[0002] Smart wearable products (such as watches and wristbands) have high requirements for waterproof performance. End customers generally choose the airtightness method to test the waterproof performance of smart wearable products, which is the compressed air method. Airtightness test levels include 5ATM (atmosphere), 5.5ATM, 6ATM, etc., with higher levels indicating more stringent waterproof performance requirements. For example, 5ATM means a waterproof pressure rating of 5 atmospheres, or 50 meters waterproof, meaning the product can be placed in 50 meters of still water at room temperature for a certain period of time without water ingress.

[0003] However, in existing display modules, when the cover plate is bonded to optical clear adhesive (OCA), the optical clear adhesive will peel off from the cover plate when the cover plate is subjected to a downward force, thereby forming air bubbles between the cover plate and the optical clear adhesive, resulting in poor appearance of the display module. Summary of the Invention

[0004] This application provides an adhesive film and its preparation method, as well as a display module, which aims to solve the problem that in existing display modules, when the cover plate is subjected to a downward force, the optical adhesive will peel off from the cover plate, thereby forming air bubbles between the cover plate and the optical adhesive, resulting in poor appearance of the display module.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide an adhesive film, which includes a first adhesive portion and at least one second adhesive portion; the first adhesive portion has at least one annular groove; each second adhesive portion is disposed in one of the annular grooves; wherein at least one second adhesive portion is spaced apart along the central region of the first adhesive portion toward the edge; and the hardness of the second adhesive portion is less than the hardness of the first adhesive portion.

[0006] The second adhesive portion extends circumferentially along the central region of the first adhesive portion and contacts the adjacent first adhesive portion.

[0007] The first adhesive portion and the second adhesive portion are made of the same material;

[0008] Preferably, the first adhesive portion and the second adhesive portion have the same thickness.

[0009] The number of the annular grooves is multiple; the number of the second adhesive portions is multiple;

[0010] Preferably, the plurality of annular grooves are provided in a one-to-one correspondence with the plurality of second adhesive portions.

[0011] Wherein, at least a portion of the plurality of second adhesive portions is in a closed-loop shape; or...

[0012] At least one of the plurality of second adhesive portions includes a plurality of sub-adhesive portions, which are spaced apart along the circumferential direction of the central region of the first adhesive portion.

[0013] In this case, the centers of multiple second adhesive portions overlap.

[0014] The center of the second adhesive portion coincides with the center of the first adhesive portion.

[0015] The second adhesive part is a concentric circular ring, a concentric square ring, or a concentric polygonal ring.

[0016] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a display module. The display module includes a display panel, an adhesive film, and a cover plate; wherein the adhesive film is disposed between the display panel and the cover plate for bonding the cover plate and the display panel; the adhesive film is the adhesive film mentioned above.

[0017] To solve the above-mentioned technical problems, another technical solution adopted in this application is: providing a method for preparing an adhesive film. The method includes: providing a carrier element; disposing of a first adhesive material on the carrier element and performing a first semi-curing to form a first adhesive portion; forming at least one annular groove on the first adhesive portion; filling at least a portion of the at least one annular groove with a second adhesive material, and performing at least a second semi-curing on the second adhesive material to form at least one second adhesive portion; wherein at least one second adhesive portion is spaced apart along the central region of the first adhesive portion toward the edge; and the hardness of the second adhesive portion is less than the hardness of the first adhesive portion.

[0018] The beneficial effects of the embodiments of this application, which differ from the prior art, are as follows: The adhesive film provided in the embodiments of this application includes a first adhesive portion and at least one second adhesive portion. The first adhesive portion has at least one annular groove. Each second adhesive portion is disposed within an annular groove. At least one second adhesive portion is spaced apart along the central region of the first adhesive portion toward the edge. The hardness of the second adhesive portion is less than that of the first adhesive portion. In this way, the hardness of the adhesive film can be arranged in an alternating pattern of hard, soft, hard, and soft from its central region toward its edge, similar to a spring structure. Therefore, when the cover plate is subjected to force, such as when the end customer performs an airtightness test on the display module including the adhesive film, causing the central region of the cover plate to deform and the center of the adhesive film to also deform, the softer second adhesive portion can absorb part of the tensile force transmitted from the central region of the adhesive film to its edge, thus significantly reducing the tensile force on the edge of the adhesive film. This effectively reduces the probability of the adhesive film peeling off from the cover plate and air bubbles forming between the adhesive film and the cover plate, causing defects in the appearance of the display module, when the cover plate is subjected to force. Attached Figure Description

[0019] Figure 1 A top view of an adhesive film provided in an embodiment of this application;

[0020] Figure 2 A top view of the adhesive film provided in another embodiment of this application;

[0021] Figure 3 A top view of the adhesive film provided in yet another embodiment of this application;

[0022] Figure 4 A simplified structural diagram of a display module provided in one embodiment of this application;

[0023] Figure 5 A flowchart illustrating a method for preparing an adhesive film according to an embodiment of this application;

[0024] Figures 6 to 9 for Figure 5 The diagram shows the specific process flow and corresponding structural schematic of the preparation method of the adhesive film.

[0025] Explanation of reference numerals in the attached figures

[0026] 10-Display panel; 20-Adhesive film; 30-Cover plate; 1-First adhesive section; A-Central area; 11-Annular groove; 111-Sub-annular groove; 2-Second adhesive section; 21-Sub-adhesive section; 3-Carrier element. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In related technologies, OLED display modules typically include a housing, a cover plate, an OCA (Optical Characteristic Aperture Condensation), and a display panel. The display panel comprises a polarizer, a screen body, and foam, stacked sequentially. The housing is a hollow structure with an opening at one end. The circumferential edge of the cover plate is bonded to the edge of the housing using adhesive to seal the gap between the cover plate and the housing; the remaining portion of the cover plate is suspended, and the central area of ​​the cover plate is bonded to the display panel via an OCA. The display panel is housed within the housing.

[0031] Because the cover plate, except for the edge area (hereinafter referred to as the suspended area), is suspended, when the cover plate is subjected to force, such as when the end customer conducts an airtightness test on the display module, the suspended area of ​​the cover plate will deform downwards. The further away from the edge of the cover plate, the greater the deformation. Therefore, the central area of ​​the cover plate deforms the most, which in turn causes the central area of ​​the OCA to deform downwards as well. This causes other parts of the OCA to be pulled by the central area and to undergo relative displacement with the cover plate. Moreover, the further away the OCA is from its central area, the greater the pulling force it experiences, and the greater the degree of relative displacement with the cover plate. When the relative displacement reaches a critical point, the OCA will peel off from the cover plate, resulting in air bubbles between the cover plate and the OCA, causing poor appearance of the display module.

[0032] Therefore, this application provides an adhesive film and its preparation method, as well as a display module. When the adhesive film is applied to the display module, it can absorb part of the tensile force transmitted from the central region A of the adhesive film to the edge when the cover plate is under stress, such as when the end customer conducts an airtightness test on the display module. This significantly reduces the tensile force at the edge of the adhesive film, thereby effectively improving the situation where the adhesive film peels off from the cover plate due to the stress on the cover plate, and air bubbles are generated between the adhesive film and the cover plate, resulting in poor appearance of the display module.

[0033] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Please see Figure 1 , Figure 1 This is a top view of an adhesive film provided according to an embodiment of this application. In this embodiment, an adhesive film 20 is provided, which can be used in a display module to bond a cover plate 30 and a display panel 10. The adhesive film 20 specifically includes a first adhesive portion 1 and at least one second adhesive portion 2.

[0035] Combination Figures 7 to 9 As shown, the first adhesive portion 1 has at least one annular groove 11. The number of annular grooves 11 can be one, extending circumferentially around the central region A of the first adhesive portion 1. Alternatively, the number of annular grooves 11 can be multiple, spaced apart along a direction M (hereinafter referred to as the radial direction M) from the central region A of the first adhesive portion 1 towards the edge, and each annular groove 11 extends along a circumferential direction N (hereinafter referred to as the circumferential direction N) of the central region A of the first adhesive portion 1.

[0036] The central region of the first adhesive portion 1 can refer to the area within the first adhesive portion 1 that is surrounded by the second adhesive portion 2, which is closest to the center of the adhesive film 20. For example... Figure 1In the middle, the first adhesive part 1 is surrounded by the second adhesive part 2 located in the inner circle, forming a region A. It should also be noted that the circumferential direction of the central region A of the first adhesive part 1 can be a circular circumference, a square circumference, or a polygonal circumferential circumference; this application does not limit this.

[0037] The number of second adhesive portions 2 can be one, with one second adhesive portion 2 disposed within one annular groove 11. Alternatively, the number of second adhesive portions 2 can be multiple, with each of the multiple second adhesive portions 2 disposed within one annular groove 11. In some embodiments, the multiple second adhesive portions 2 are disposed in a one-to-one correspondence with the multiple annular grooves 11, that is, one second adhesive portion 2 is formed within one annular groove 11. The following embodiments of this application will be described using this as an example.

[0038] Specifically, the number of second adhesive portions 2 is not less than two. Multiple second adhesive portions 2 are spaced apart along the radial direction M of the first adhesive portion 1, and each second adhesive portion 2 extends along the circumferential direction N of the first adhesive portion 1 and contacts the adjacent first adhesive portion 1. For example, Figure 1 In the middle, the second adhesive part 2 of the inner ring is in contact with the central region A of the adjacent first adhesive part 1 and the portion of the first adhesive part 1 between the two second adhesive parts 2.

[0039] Of course, in other embodiments, the second adhesive portion 2 may not be formed in part of the annular groove 11. The annular groove 11 formed on the first adhesive portion 1 may also reduce the tension transmitted from the central region A of the adhesive film 20 to its edge.

[0040] Combination Figure 1 It can be understood that the adhesive film 20 includes alternating first adhesive portion 1, second adhesive portion 2, first adhesive portion 1, second adhesive portion 2, and so on, along the direction from the center region A of the adhesive film 20 towards the edge. Among them, the hardness of the second adhesive portion 2 is less than that of the first adhesive portion 1; thus, the hardness of the adhesive film 20 along its radial direction M is a structure of alternating hard, soft, hard, soft, similar to a spring structure; therefore, when the cover plate 30 is subjected to force, such as when the end customer performs an airtightness test on the display module including the adhesive film 20, causing the center region of the cover plate 30 to deform and the center of the adhesive film 20 to also deform, the softer second adhesive portion 2 can absorb part of the tensile force transmitted from the center region A of the adhesive film 20 to its edge, thus significantly reducing the tensile force on the edge of the adhesive film 20, thereby effectively reducing the probability of the adhesive film 20 peeling off from the cover plate 30 and the formation of air bubbles between the adhesive film 20 and the cover plate 30, resulting in poor appearance of the display module when the cover plate 30 is subjected to force.

[0041] Specifically, the first adhesive portion 1 and the second adhesive portion 2 are made of the same material; this ensures that the overall effect of the adhesive film 20 remains consistent, without obvious boundaries, thus preventing any impact on the display of the display module when the adhesive film 20 is applied to the display module product later. Specifically, the first adhesive portion 1 and the second adhesive portion 2 can be made of OCA adhesive. Of course, in other embodiments, while ensuring that the display of the display module is not significantly affected, different materials can be selected for the first adhesive portion 1 and the second adhesive portion 2; for example, the second adhesive portion 2 can be made of a softer material.

[0042] Specifically, the first adhesive part 1 and the second adhesive part 2 have the same thickness to ensure that the overall thickness of the corresponding adhesive film 20 is consistent, thereby ensuring that any position of the adhesive film 20 can be fully bonded and contacted with the two adjacent components to bond and fix the two adjacent components.

[0043] In some embodiments, such as Figure 1 As shown, each of the multiple second adhesive portions 2 is in a closed loop shape; thus, when the central region A of the adhesive film 20 is subjected to force, the softer second adhesive portion 2 can absorb part of the tensile force transmitted from the central region A of the adhesive film 20 to its edge at any position along the circumferential direction N of the adhesive film 20, thereby significantly reducing the tensile force at any edge position of the adhesive film 20 along its circumferential direction N. This effectively reduces the probability of the adhesive film 20 peeling from the cover plate 30 and air bubbles forming between the adhesive film 20 and the cover plate 30 when the central region A of the adhesive film 20 is subjected to force, thus causing poor appearance of the display module.

[0044] Specifically, each second adhesive part 2 can be in the form of a closed loop, such as a circular ring, a square ring, a polygon, or other irregular shapes. The shapes of multiple second adhesive parts 2 can be all identical; partially identical and partially different; or all different.

[0045] In some embodiments, such as Figure 1 The centers of the multiple second adhesive portions 2 coincide. In one specific embodiment, the center of each second adhesive portion 2 coincides with the center of the first adhesive portion 1; in this way, the multiple second adhesive portions 2 can uniformly absorb the tensile force transmitted from the central region A of the adhesive film 20 to its edge along the circumferential direction N of the adhesive film 20, ensuring that the tensile force at every position along the circumferential direction N of the edge of the adhesive film 20 is uniform, avoiding the problem of large local stress leading to the separation of the adhesive film 20 from the cover plate 30.

[0046] In other embodiments, see Figure 2 , Figure 2This is a top view of the adhesive film 20 provided in another embodiment of this application; at least one of the plurality of second adhesive portions 2 includes a plurality of sub-adhesive portions 21, which are spaced apart along the circumferential direction N of the first adhesive portion 1. Specifically, the plurality of sub-adhesive portions 21 can be equally spaced along the circumferential direction N of the first adhesive portion 1. Furthermore, it should be noted that each sub-adhesive portion 21 can be straight, arc-shaped, or curved; this application does not limit this, as long as the plurality of sub-adhesive portions 21 are arranged around the central region A of the first adhesive portion 1 in the circumferential direction N. In some preferred embodiments, the sub-adhesive portions 21 can be straight or arc-shaped to facilitate the processing of the corresponding sub-annular groove 111.

[0047] In some specific embodiments, each second adhesive portion 2 includes a plurality of sub-adhesive portions 21. Alternatively, some of the multiple second adhesive portions 2 include a plurality of sub-adhesive portions 21, while the remaining second adhesive portions 2 are in a closed loop shape.

[0048] Of course, in some other embodiments, see [reference] Figure 3 , Figure 3 This is a top view of the adhesive film 20 provided in another embodiment of this application; the second adhesive portion 2 can also be non-closed-loop, that is, the second adhesive portion 2 extends along the circumferential direction N of the first adhesive portion 1 and surrounds a portion of the central region A of the first adhesive portion 1; for example, it can be arc-shaped, concave-shaped, etc. It can be understood that in this embodiment, the second adhesive portion 2 can absorb the tensile force transmitted from the central region A of the adhesive film 20 to the edge in a specific area of ​​the adhesive film 20. For example, Figure 3 In this embodiment, the second adhesive portion 2 can absorb the tensile force transmitted from the central region A of the adhesive film 20 to its edge within the S region of the adhesive film 20, but it cannot absorb the tensile force transmitted from the central region A of the adhesive film 20 to its edge in other regions of the adhesive film 20. This embodiment can also improve the situation where the adhesive film 20 peels off from the cover plate 30 and air bubbles are generated between the adhesive film 20 and the cover plate 30 when the cover plate 30 or the adhesive film 20 is under stress, resulting in poor appearance of the display module.

[0049] Of course, in other embodiments, the plurality of second adhesive portions 2 may also be partially closed-loop and partially non-closed-loop.

[0050] The adhesive film 20 provided in this application embodiment includes a first adhesive portion 1 and at least one second adhesive portion 2. The first adhesive portion 1 has at least one annular groove 11. Each second adhesive portion 2 is disposed in an annular groove 11. At least one second adhesive portion 2 is spaced apart along the radial direction M of the first adhesive portion 1. Each second adhesive portion 2 extends along the circumferential direction N of the first adhesive portion 1 and contacts an adjacent first adhesive portion 1. The hardness of the second adhesive portion 2 is less than the hardness of the first adhesive portion 1. In this way, the hardness of the adhesive film 20 can be arranged in an alternating pattern of hard, soft, hard, and soft along its radial direction M, similar to a spring structure. Therefore, when the cover plate 30 is subjected to force, such as when the end customer performs an airtightness test on the display module including the adhesive film 20, causing the central area of ​​the cover plate 30 to deform and the center of the adhesive film 20 to also deform, the softer second adhesive part 2 can absorb part of the tensile force transmitted from the central area A of the adhesive film 20 to its edge. This significantly reduces the tensile force on the edge of the adhesive film 20, thereby effectively reducing the probability of the adhesive film 20 peeling off from the cover plate 30 and air bubbles forming between the adhesive film 20 and the cover plate 30 during the product's airtightness test, which would cause defects in the appearance of the display module.

[0051] In one embodiment, see Figure 4 , Figure 4 This is a simplified structural diagram of a display module provided in one embodiment of the present application; a display module is provided that can be used in electronic devices, such as mobile phones, watches, computers, etc. The display module includes a display panel 10, an adhesive film 20, and a cover plate 30.

[0052] The display panel 10 includes structural layers such as a display screen body, a support plate, and a polarizer, and is used to display images during operation. The specific structure and function of the display panel 10 are the same as or similar to the structure and function of existing display panels, and can be found in the prior art.

[0053] Adhesive film 20 is disposed between display panel 10 and cover plate 30 for bonding cover plate 30 and display panel 10. Adhesive film 20 is the adhesive film 20 provided in the above embodiment; the specific structure and function of adhesive film 20 can be found in the above description.

[0054] Of course, in specific embodiments, the display module also includes other structures such as a housing, and for details, please refer to the relevant structural descriptions of existing display modules.

[0055] In one embodiment, see Figures 5 to 7 , Figure 5 A flowchart illustrating a method for preparing an adhesive film according to an embodiment of this application; Figures 6 to 9 for Figure 5 The diagram shows a structural schematic corresponding to the specific process of preparing the adhesive film. A method for preparing an adhesive film is provided, which can be used to prepare the adhesive film 20 involved in the above embodiments. The method includes:

[0056] Step S1: Provide the load-bearing element.

[0057] The carrier element 3 can be made of relatively inexpensive PET (Polyethylene terephthalate) film. Of course, other substrates or carrier stages can also be used for the carrier element 3. This application does not limit this, as long as they can provide a certain load-bearing function.

[0058] Step S2: Apply the first adhesive material to the carrier element and perform a first semi-curing to form the first adhesive part.

[0059] Specifically, such as Figure 6 As shown, a first adhesive material can be applied to the carrier element 3 and semi-cured to form a first adhesive portion 1. The first adhesive portion 1 can be OCA adhesive.

[0060] Step S3: Open at least one annular groove on the first adhesive part.

[0061] Specifically, such as Figure 7 As shown, a plurality of annular grooves 11 can be formed on the first adhesive portion 1 using a mold. The annular grooves 11, along the thickness direction of the first adhesive portion 1, can be blind grooves or through grooves. Preferably, the annular grooves 11 are through grooves along the thickness direction of the first adhesive portion 1 to ensure that the thickness of the subsequently formed second adhesive portion 2 is consistent with the thickness of the first adhesive portion 1, thereby ensuring that the overall thickness of the final adhesive film 20 is consistent. This ensures that any position of the adhesive film 20 can completely adhere and contact with the adjacent cover plate 30 and display panel 10, thus bonding and fixing the cover plate 30 to the display panel 10.

[0062] Specifically, the number of annular grooves 11 is not less than two. Multiple annular grooves 11 are spaced apart along the radial direction M of the first adhesive portion 1, and each annular groove 11 extends along the circumferential direction N of the first adhesive portion 1. In some embodiments, such as Figure 7 As shown, each of the plurality of annular grooves 11 is a closed loop, such as a circular ring, a square ring, a polygon, or other irregular closed loop shape. The shapes of the plurality of annular grooves 11 can be all identical; or partially identical and partially different; or all different. Of course, the number of annular grooves 11 can also be only one.

[0063] In some embodiments, such as Figure 7 The centers of the multiple annular grooves 11 coincide. In one specific embodiment, the center of each annular groove 11 coincides with the center of the first adhesive portion 1. In other embodiments, such as... Figure 8As shown, at least one of the plurality of annular grooves 11 includes a plurality of sub-annular grooves 111, which are spaced apart along the circumferential direction N of the first adhesive portion 1. Specifically, the plurality of sub-annular grooves 111 can be equally spaced along the circumferential direction N of the first adhesive portion 1.

[0064] Each sub-annular groove 111 can be straight, curved, or arc-shaped.

[0065] In some embodiments, each annular groove 11 may include a plurality of sub-annular grooves 111. Alternatively, a portion of the annular grooves 11 may include a plurality of sub-annular grooves 111, while the remaining portion of the annular grooves 11 may be in a closed loop shape.

[0066] Of course, in some other embodiments, see [reference] Figure 9 The annular groove 11 can also be non-closed ring, that is, the annular groove 11 extends along the circumferential direction N of the first adhesive part 1 and surrounds the central region A of the first adhesive part 1.

[0067] Step S4: Fill at least a portion of the annular grooves with a second adhesive material and perform at least a second semi-curing on the second adhesive material to form at least one second adhesive portion; wherein at least one second adhesive portion is spaced apart along the central region of the first adhesive portion toward the edge; and the hardness of the second adhesive portion is less than the hardness of the first adhesive portion.

[0068] In the specific implementation process, a second adhesive material can be filled into each annular groove 11, and both the second adhesive material and the first adhesive part 1 can be semi-cured a second time to form a plurality of second adhesive parts 2 in the plurality of annular grooves 11; wherein, the plurality of second adhesive parts 2 are spaced apart along the central region A of the first adhesive part 1 toward the edge, and each second adhesive part 2 is arranged around the central region A of the first adhesive part 1 and in contact with the adjacent first adhesive part 1; and the hardness of the second adhesive part 2 is less than the hardness of the first adhesive part 1. Alternatively, only one second adhesive part 2 can be formed.

[0069] It is understandable that the first adhesive portion 1 undergoes two semi-curing processes, while the second adhesive portion 2 undergoes only one semi-curing process. This results in a difference in the hardness of the first adhesive portion 1 and the second adhesive portion 2, with the first adhesive portion 1 being harder and the second adhesive portion 2 being softer. Thus, the hardness of the adhesive film 20 produced by this method varies from its central region A towards the edge, exhibiting a pattern of hard, soft, hard, soft, similar to a spring structure. Therefore, when the cover plate 30 is subjected to force, such as during an airtightness test of the display module including the adhesive film 20 by an end customer, causing the central region of the cover plate 30 to deform and consequently the center of the adhesive film 20 to also deform, the softer second adhesive portion 2 can absorb some of the tensile force transmitted from the central region A of the adhesive film 20 to its edge. This significantly reduces the tensile force at the edge of the adhesive film 20, effectively reducing the probability of the adhesive film 20 peeling from the cover plate 30, air bubbles forming between the adhesive film 20 and the cover plate 30, and causing defects in the appearance of the display module when the cover plate 30 is subjected to force.

[0070] Of course, in other embodiments, the second adhesive portion 2 may also be formed in a portion of the annular grooves 11 among the plurality of annular grooves 11.

[0071] Specifically, in Figure 7 For the specific structure of the second adhesive portion 2 formed within the annular groove 11 shown, please refer to [reference needed]. Figure 1 ;exist Figure 8 For the specific structure of the second adhesive portion 2 formed within the annular groove 11 shown, please refer to [reference needed]. Figure 2 ;exist Figure 9 For the specific structure of the second adhesive portion 2 formed within the annular groove 11 shown, please refer to [reference needed]. Figure 3 The other structures and functions of the second adhesive part 2 can be found in the relevant description of the adhesive film 20 provided in the above embodiments, and will not be repeated here.

[0072] The method for preparing the adhesive film provided in this embodiment enables the adhesive film 20 to be applied to the display module. When the cover plate 30 of the display module is subjected to force, such as when the end customer performs an airtightness test on the display module including the adhesive film 20, causing the central area of ​​the cover plate 30 to deform and the central area A of the adhesive film 20 to also deform, the softer second adhesive part 2 can absorb part of the tensile force transmitted from the central area A of the adhesive film 20 to its edge. This significantly reduces the tensile force at the edge of the adhesive film 20, thereby effectively reducing the probability of the adhesive film 20 peeling off from the cover plate 30 and air bubbles forming between the adhesive film 20 and the cover plate 30 when the cover plate 30 is subjected to force, resulting in poor appearance of the display module.

[0073] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A film, characterized in that, include: The first adhesive portion has at least one annular groove; At least one second adhesive portion, each second adhesive portion being disposed within one of the annular grooves; The second adhesive portion extends circumferentially along the central region of the first adhesive portion; the first adhesive portion and the second adhesive portion have the same thickness. In this embodiment, at least one of the second adhesive portions is spaced apart along the central region of the first adhesive portion toward the edge; and the hardness of the second adhesive portion is less than the hardness of the first adhesive portion.

2. The adhesive film according to claim 1, characterized in that, The second adhesive portion contacts the adjacent first adhesive portion.

3. The adhesive film according to claim 1, characterized in that, The first adhesive portion and the second adhesive portion are made of the same material.

4. The adhesive film according to claim 1, characterized in that, The number of annular grooves is multiple; the number of second adhesive portions is multiple.

5. The adhesive film according to claim 4, characterized in that, At least a portion of the plurality of second adhesive portions is in a closed-loop shape; or, At least one of the plurality of second adhesive portions includes a plurality of sub-adhesive portions, which are spaced apart along the circumferential direction of the central region of the first adhesive portion.

6. The adhesive film according to claim 1, characterized in that, The centers of multiple second adhesive portions overlap.

7. The adhesive film according to claim 1, characterized in that, The center of the second adhesive portion coincides with the center of the first adhesive portion.

8. The adhesive film according to claim 1, characterized in that, The second adhesive part is a concentric circular ring, or a concentric square ring, or a concentric polygonal ring.

9. A display module, characterized in that, include: The display panel, adhesive film, and cover plate; wherein the adhesive film is disposed between the display panel and the cover plate for bonding the cover plate and the display panel; The adhesive film is the adhesive film as described in any one of claims 1-8.

10. A method for preparing an adhesive film, characterized in that, include: Provide load-bearing elements; A first adhesive material is applied to the carrier element and subjected to a first semi-curing process to form a first adhesive portion; At least one annular groove is formed on the first adhesive part; At least a portion of the at least one annular groove is filled with a second adhesive material, and the second adhesive material is subjected to at least a second semi-curing to form at least one second adhesive portion; wherein at least one second adhesive portion is spaced apart along the central region of the first adhesive portion toward the edge; and the hardness of the second adhesive portion is less than the hardness of the first adhesive portion.

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