Display module, preparation method thereof and display device

Abstract

The invention provides a display module and a preparation method thereof and a display device, and the display module comprises a display panel which comprises a display area and an opening area, and the display area at least partially surrounds the opening area; the through hole is located in the opening area and penetrates through the display panel; the blocking structure is located in the hole opening area and arranged around the through hole, and the blocking structure is used for blocking light and water vapor. According to the display module, the blocking structure is arranged and located between the through hole and the display area, light propagation and water and oxygen transmission between the through hole and the display area can be prevented, on one hand, the blocking structure blocks light emitted from the display panel from being propagated towards the side wall of the through hole, and the light leakage phenomenon of the through hole is avoided; and on the other hand, the blocking structure blocks external light and prevents the light from entering the display area of the display panel through the hole to influence the display effect, so that the arrangement of the blocking structure is beneficial to improving the shooting quality of the photosensitive element and the use experience of a user, and the display performance can also be improved.

Description

Technical Field

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

[0002] In recent years, in order to improve the appearance and display effect of displays, flexible OLED (Organic Light-Emitting Diode) displays have been increasingly used. OLED (Organic Light-Emitting Diode) is an active light-emitting device with a sandwich structure consisting of multiple organic layers and electrodes on both sides. At present, displays based on AMOLED (Active-matrix organic light-emitting diode) have been commercialized in the fields of smartphones, watches, and laptops.

[0003] However, the performance of current OLED display products needs to be improved. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a display module and a preparation method thereof, and a display device to enhance the light blocking and water vapor blocking capabilities.

[0005] Based on the above objectives, the present application provides a display module, including:

[0006] The display panel comprises a display area and an opening area, wherein the display area at least partially surrounds the opening area;

[0007] A through hole, located in the opening area and passing through the display panel;

[0008] The barrier structure is located in the opening area and is arranged around the through hole, and the barrier structure is used to block light and water vapor.

[0009] In one embodiment, the barrier structure includes a cutting groove and functional glue, and the functional glue is filled in the cutting groove;

[0010] Preferably, the cutting groove comprises an annular groove structure surrounding the through hole;

[0011] Preferably, the width of the cutting groove is comprised between 20um and 1mm.

[0012] In one embodiment, the display module includes a blocking portion, the blocking portion is located in the opening area, and the blocking portion is disposed between the through hole and the blocking structure;

[0013] Preferably, the blocking portion comprises an annular structure surrounding the through hole.

[0014] In one embodiment, the cutting groove is arranged at a preset angle between an extension direction of the first cross section and the display panel, wherein the first cross section is perpendicular to the plane where the display panel is located;

[0015] Preferably, the preset angle is greater than or equal to 10 degrees and less than or equal to 90 degrees.

[0016] In one embodiment, the functional glue comprises a single-layer structure or a multi-layer structure;

[0017] Preferably, the functional glue comprises a water vapor-proof layer and a light-absorbing layer;

[0018] Preferably, the functional glue includes at least one of silicone glue, epoxy glue or acrylic glue;

[0019] Preferably, the functional glue includes black glue.

[0020] In one embodiment, the display module further comprises a composite tape layer, the composite tape layer is arranged on the backlight side of the display panel, and one end of the cutting groove is arranged on the composite tape layer;

[0021] Preferably, the cutting groove is a conical annular groove structure, the cutting groove is close to the orthographic projection of one end of the composite tape layer on the composite tape layer, and is located on the inner side of the orthographic projection of one end of the cutting groove away from the composite tape layer on the composite tape layer.

[0022] Preferably, the display module comprises a cover plate, and the cover plate is arranged on the light emitting side of the display panel;

[0023] Preferably, the cover plate at least covers the display panel, the through hole and the barrier structure;

[0024] Preferably, the display module comprises a polarizing layer, the polarizing layer is located between the display panel and the cover plate, and the through hole passes through the polarizing layer;

[0025] Preferably, the display module comprises an optical adhesive layer, the optical adhesive layer is located between the cover plate and the display panel, and the through hole penetrates the optical adhesive layer;

[0026] Preferably, the display module comprises a support layer, the support layer is located on a side of the display panel away from the cover plate, and the through hole penetrates the support layer. Based on the same inventive concept, the present application also discloses a method for preparing a display module, which comprises the following steps:

[0027] Providing a display module to be cut, wherein the display module comprises a display panel;

[0028] Cutting a cutting groove in the opening area of ​​the display panel, and injecting functional glue into the cutting groove to form a barrier structure;

[0029] A through hole penetrating the display panel is cut in the barrier structure.

[0030] In one embodiment, after the functional glue is injected into the cutting groove, the functional glue is cured to form the barrier structure;

[0031] Preferably, injecting functional glue into the cutting groove comprises:

[0032] Injecting the functional glue into the cutting groove by inkjet printing, screen printing or glue spray valve;

[0033] Preferably, curing the functional glue comprises:

[0034] The functional glue is cured by thermal curing or ultraviolet curing.

[0035] Based on the same inventive concept, the present application also discloses a display device, which includes any one of the display modules described above.

[0036] Compared with the prior art, the display module provided in the present application, by setting a barrier structure so that the barrier structure is located between the through hole and the display area, can prevent the propagation of light and the penetration of water and oxygen between the through hole and the display area. The barrier structure blocks the light emitted from the display panel from propagating toward the side wall of the through hole, thereby avoiding light leakage in the through hole and affecting the light transmittance of the through hole.

[0037] At the same time, the barrier structure can also prevent water vapor and oxygen from penetrating into the display area of ​​the display panel through the through holes, avoiding display defects such as dark spots and improving display performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 is a schematic diagram of a related display module;

[0040] Figure 2 is a schematic diagram of a layer structure of a related display module;

[0041] Figure 3 A schematic diagram of a display module in an embodiment of the present application;

[0042] Figure 4 This is a schematic diagram of the layer structure of a display module in one embodiment of the present application;

[0043] Figure 5 This is a schematic diagram of the layer structure of a display module in another embodiment of the present application;

[0044] Figure 6 This is a schematic diagram of the layer structure of a display module in another embodiment of the present application;

[0045] Figure 7 This is a schematic diagram of the layer structure of a display module in another embodiment of the present application;

[0046] Figure 8 This is a schematic diagram of a display module in another embodiment of the present application;

[0047] Fig. 9 This is a schematic diagram of the layer structure of a display module in another embodiment of the present application;

[0048] Fig.10 This is a schematic diagram of the layer structure of a display module in another embodiment of the present application;

[0049] Fig.11 FIG. 1 is a flow chart of a method for preparing a display module in an embodiment of the present application.

[0050] Marking Description:

[0051] 100. Display module; 10. Display panel; 101. Display area; 102. Opening area; 103. Light-emitting device; 11. Through hole; 12. Barrier structure; 121. Cutting groove; 122. Functional glue; 13. Barrier part; 14. Polarizing layer; 15. Support layer; 16. Optical adhesive layer; 17. Composite tape layer; 18. Cover plate. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0053] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0054] Active matrix organic light-emitting diode panels are widely used in mobile phones, wearable devices and other fields due to their bendable and foldable advantages. In order to maximize the display screen of mobile phones, hole-punch screens are currently mainly used, which means punching holes in the active area to achieve a higher screen-to-body ratio or specific functions, such as under-screen cameras.

[0055] Figure 1 , Figure 2 A related display module 100 is provided, which includes a display panel 10. A through hole 11 is provided in the display panel 10, which is used to place a camera. The display panel 10 includes a light-emitting device 103. The inventor has found that since the light-emitting device 103 is located close to the through hole 11, when the display panel 10 emits light through the light-emitting device 103, light will leak out of the through hole 11, resulting in light leakage, and also affecting the light transmittance of the through hole 11. In addition, a camera needs to be placed under the through hole 11, and the water vapor resistance of the through hole 11 also needs to be considered. The existing display module 100 has the problems of light leakage and poor water vapor resistance.

[0056] Based on this, the present application provides a display module and a preparation method thereof, and a display device solution to solve the above problems.

[0057] Reference Figure 3 , Figure 4The embodiment of the present application provides a display module 100, which includes a display panel 10, a through hole 11 and a barrier structure 12. The display panel 10 includes a display area 101 and an opening area 102. The display area 101 is at least partially arranged around the opening area 102, that is, the display area 101 completely or partially surrounds the opening area 102; the through hole 11 is located in the opening area 102, and the through hole 11 passes through the display panel 10; the barrier structure 12 is located in the opening area 102, and the barrier structure 12 is arranged around the through hole 11, wherein the barrier structure 12 is used to block light and water vapor.

[0058] The display module 100 provided in the embodiment of the present application can prevent the propagation of light and the penetration of water and oxygen between the through hole 11 and the display area 101 by providing a barrier structure 12, and the barrier structure 12 is located between the through hole 11 and the display area 101. On the one hand, the barrier structure 12 blocks the light emitted by the light-emitting device 103 in the display panel 10 from propagating toward the side wall of the through hole 11, avoiding light leakage from the through hole 11, reducing the impact on the light transmittance of the through hole 11, and helping to improve the shooting quality of the photosensitive element. In addition, the barrier structure 12 can also prevent water vapor and oxygen from penetrating into the display area 101 of the display panel 10 from the through hole 11, avoiding display defects such as dark spots.

[0059] Exemplarily, the through hole 11 is a circular hole, and a camera may be installed in the through hole 11 . The camera receives external light through the through hole 11 to acquire an image outside the display panel 10 .

[0060] Continue to refer to Figure 3 , Figure 4 In one embodiment, the barrier structure 12 includes a cutting groove 121 and a functional glue 122, and the functional glue 122 is filled in the cutting groove 121. The barrier structure 12 is formed by cutting the cutting groove 121 in the opening area 102 of the display panel 10 and filling the functional glue 122 in the cutting groove 121. In this way, the process operation is simple and has no additional impact on the product. In addition, the functional glue 122 can absorb the impact of external force on the side wall when the through hole 11 is subsequently cut to form the through hole 11. In the process of cutting the through hole 11, the external force impact can be reduced to avoid cracks in the film structure of the display module 100.

[0061] Preferably, the cutting groove 121 is formed in the opening area 102 by laser cutting, and the direction of laser irradiation is from the side where the light emitting surface of the display panel 10 is located to the side where the backlight surface of the display panel 10 is located. Specifically, the functional glue 122 has the functions of black light absorption and water vapor resistance. The cutting groove 121 is a ring groove structure surrounding the through hole 11. In the first section perpendicular to the display panel 10, the width direction of the cutting groove 121 is perpendicular to the length extension direction thereof.

[0062] Preferably, the width of the cutting groove 121 is 20um-1mm. For example, the width of the cutting groove 121 can be 20um, 100um, 500um, 700um, 1mm, etc. The specific value can be selected according to the performance of the glue.

[0063] Continue to refer to Figure 3 , Figure 4 In one embodiment, the display module 100 includes a barrier portion 13, the barrier portion 13 is located in the opening area 102, and the barrier portion 13 is located between the through hole 11 and the barrier structure 12. The barrier portion 13 is left between the through hole 11 and the barrier structure 12, so that the size of the through hole 11 is smaller than the size of the barrier portion 13. When the through hole 11 is cut, the barrier portion 13 can prevent the functional glue 122 from diffusing into the through hole 11 to ensure the glue injection effect, and also prevent the cutting of the through hole 11 from damaging the barrier structure 12.

[0064] Preferably, the barrier portion 13 is an annular structure arranged around the through hole 11. The annular barrier portion 13 isolates the inner through hole 11 and the outer barrier structure 12 in all directions to prevent the through hole 11 and the barrier structure 12 from affecting each other during the cutting process.

[0065] Preferably, the through hole 11 is formed in the barrier structure 12 by laser cutting.

[0066] Reference Figure 4 In one embodiment, the length extension direction of the cutting groove 121 on the first section is set at a preset angle a with the display panel 10, wherein the plane where the first section is located is perpendicular to the plane where the display panel 10 is located;

[0067] Preferably, the preset angle a is greater than or equal to 10 degrees and less than or equal to 90 degrees. The preset angle a refers to the angle between the extension direction of the cutting groove 121 and the display panel 10. The size of the preset angle a can affect the light shielding range of the blocking structure 12. The smaller the preset angle a is, the larger the light shielding range of the blocking structure 12 is.

[0068] For example, the preset angle a may be 10 degrees, 30 degrees, 45 degrees, 60 degrees, 90 degrees, etc. The size of the preset angle a may be selected according to the requirements of the display module 100 .

[0069] Preferably, the size of the end of the cutting groove 121 close to the light-emitting surface of the display panel 10 is larger than the end of the cutting groove 121 close to the backlight surface of the display panel 10. Specifically, the cutting groove 121 is a conical ring groove structure, with the light-emitting side of the display panel 10 as the upper side and the backlight side as the lower side, so the upper end of the cutting groove 121 is larger and the lower end is smaller. Correspondingly, the end of the through hole 11 close to the light-emitting surface of the display panel 10 is also larger than the end of the through hole 11 close to the backlight surface of the display panel 10. This arrangement allows more external light to enter the through hole 11, expanding the viewing angle range of the camera installed in the through hole 11.

[0070] In one embodiment, the functional glue 122 includes a single-layer structure, which can simultaneously have the functions of light absorption and water vapor resistance.

[0071] Preferably, the functional glue 122 includes black glue.

[0072] In another embodiment, the functional glue 122 includes a multi-layer structure including a water vapor-proof layer and a light-absorbing layer stacked in layers.

[0073] Preferably, the functional glue 122 includes at least one of silicone glue, epoxy glue or acrylic glue.

[0074] Reference Fig.10 In one embodiment, the display module 100 further includes a composite tape layer 17 , which is disposed on the backlight side of the display panel 10 , and one end of the cutting groove 121 is disposed on the composite tape layer 17 .

[0075] Preferably, the orthographic projection of one end of the cutting groove 121 close to the composite tape layer 17 on the composite tape layer 17 is located inside the orthographic projection of one end of the cutting groove 121 away from the composite tape layer 17 on the composite tape layer 17 .

[0076] In one embodiment, the display module 100 further includes a cover plate 18 , which is disposed on the light emitting side of the display panel 10 .

[0077] Preferably, the cover plate 18 at least covers the display panel 10 , the through hole 11 and the barrier structure 12 , that is, the orthographic projections of the display panel 10 , the through hole 11 and the barrier structure 12 on the cover plate 18 are located within the cover plate 18 , and the through hole 11 does not pass through the cover plate 18 .

[0078] Preferably, the display module 100 further includes a polarizing layer 14, the polarizing layer 14 is located between the display panel 10 and the cover plate 18, and the through hole 11 passes through the polarizing layer 14. The polarizing layer 14 is a transparent structure.

[0079] Preferably, the display module 100 further includes a supporting layer 15 , which is located on a side of the display panel 10 away from the cover plate 18 , and the through hole 11 passes through the supporting layer 15 .

[0080] Specifically, the lower end of the barrier structure 12 is located above the composite tape layer 17, and the upper end of the barrier structure 12 is located below the cover plate 18. In this embodiment, the display module 100 includes a composite tape layer 17, a support layer 15, a display panel 10, a polarizing layer 14, an optical adhesive layer 16, and a cover plate 18 stacked in sequence, and the through hole 11 and the barrier structure 12 both penetrate the optical adhesive layer 16, the polarizing layer 14, the display panel 10, and the support layer 15 in sequence, and the barrier structure 12 abuts between the cover plate 18 and the composite tape layer 17.

[0081] Reference Fig.11 Based on the same inventive concept, another embodiment of the present application further discloses a method for preparing a display module, the method comprising the following steps:

[0082] Step S1, providing a display module to be cut, wherein the display module includes a display panel 10;

[0083] Step S2, cutting a cutting groove 121 in the opening area of ​​the display panel 10, and injecting functional glue 122 into the cutting groove 121 to form a barrier structure 12;

[0084] Step S3 , cutting a through hole 11 penetrating the display panel 10 in the barrier structure 12 .

[0085] The present embodiment provides a method for preparing a display module, wherein the display module 100 is provided with a barrier structure 12, and the barrier structure 12 is located between the through hole 11 and the display area 101, which can prevent the propagation of light and the penetration of water and oxygen between the through hole 11 and the display area 101. On the one hand, the barrier structure 12 blocks the light emitted by the light-emitting device 103 in the display panel 10 from propagating toward the side wall of the through hole 11, avoiding light leakage from the through hole 11, which is beneficial to improving the shooting quality of the photosensitive element and the user experience. On the other hand, the barrier structure 12 blocks the external ambient light from being transmitted from the side wall of the through hole 11 to the display area 101 of the display panel 10, avoiding affecting the display effect of the display module 100. In addition, the barrier structure 12 can also prevent water vapor and oxygen from penetrating into the display area 101 of the display panel 10 from the through hole 11, avoiding display defects such as dark spots.

[0086] Specifically, refer to Figure 5 In step S1, the display panel 10 includes a light-emitting device 103, the display panel 10 has a light-emitting surface and a backlight surface that are relatively arranged, and the display module also includes a polarizing layer 14, a supporting layer 15, an optical adhesive layer 16 and a composite tape layer 17, wherein the polarizing layer 14 is arranged on the light-emitting surface of the display panel 10, the supporting layer 15 is arranged on the backlight surface of the display panel 10, the optical adhesive layer 16 is arranged on the side of the polarizing layer 14 away from the display panel 10, and the composite tape layer 17 is arranged on the side of the supporting layer 15 away from the display panel 10.

[0087] Specifically, refer to Figure 6 , Figure 7 , Figure 8 In step S2, along the edge position of the inner side of the opening area 102, the optical adhesive layer 16, the polarizing layer 14, the display panel 10 and the support layer 15 are cut from top to bottom in sequence using a laser to form a cutting groove 121, wherein the angle between the direction of the laser and the display panel 10 is the preset angle a, and the preset angle a ranges from 10° to 90°. The lower end of the cutting groove 121 is located on the upper surface of the composite tape layer 17. Functional glue 122 is injected into the cutting groove 121, and after the functional glue 122 is cured, a barrier structure 12 is formed. At this time, no through hole is formed inside the barrier structure 12.

[0088] Specifically, refer to Fig. 9 In step S3, after the preparation of the barrier structure 12 is completed, the inside of the barrier structure 12 in the opening area 102 is laser cut to form a through hole 11, which sequentially penetrates the optical adhesive layer 16, the polarizing layer 14, the display panel 10 and the support layer 15. The uncut part of the barrier structure 12 forms a barrier portion 13. The barrier structure 12 exists between the through hole 11 and the display area 101, thereby playing the role of blocking light and water vapor.

[0089] Preferably, the method for preparing the display module further comprises the following steps:

[0090] Step S4 : After the through hole 11 is prepared, a cover plate 18 is packaged on the light emitting surface side of the display panel 10 .

[0091] Specifically, refer to Fig.10 In step S4 , the cover plate 18 is fixed to the side of the polarizing layer 14 away from the display panel 10 through the optical adhesive layer 16 .

[0092] Furthermore, before packaging the cover plate 18 , a camera or other photosensitive element may be installed in the through hole 11 . Since the blocking portion 13 and the blocking structure 12 are located on the outer peripheral side of the through hole 11 , the installation and use of the photosensitive element will not be affected.

[0093] In one embodiment, step S2 includes: after injecting the functional glue 122 into the cutting groove 121 , curing the functional glue 122 to form the barrier structure 12 .

[0094] Preferably, injecting the functional glue 122 into the cutting groove 121 includes: injecting the functional glue 122 into the cutting groove 121 by inkjet printing or screen printing or a sealing glue spray valve.

[0095] The functional glue 122 may be a multi-layer structure including a waterproof vapor layer and a light absorbing layer. Then, injecting the functional glue 122 into the cutting groove 121 may further include: first injecting a waterproof vapor layer and curing it, then coating a light absorbing layer and curing it.

[0096] The functional glue 122 is cured, and the curing method includes but is not limited to natural curing, thermal curing, ultraviolet (UV) curing, etc. Preferably, the functional glue 122 injected into the cutting groove 121 is cured by ultraviolet heating exposure.

[0097] Based on the same inventive concept, another embodiment of the present application further discloses a display device, which includes the display module in the above embodiment.

[0098] Furthermore, the display device includes a mobile phone, a VR device, a computer, a television, a vehicle-mounted display device, etc.

[0099] The present embodiment provides a display device, in which the display module 100 is provided with a barrier structure 12, and the barrier structure 12 is located between the through hole 11 and the display area 101, which can prevent the propagation of light and the penetration of water and oxygen between the through hole 11 and the display area 101. The barrier structure 12 blocks the light emitted by the light-emitting device 103 in the display panel 10 from propagating toward the side wall of the through hole 11, avoiding the light leakage phenomenon in the through hole 11, which is beneficial to improving the shooting quality of the photosensitive element and the user experience. At the same time, the barrier structure 12 blocks the external ambient light from being transmitted from the side wall of the through hole 11 to the display area 101 of the display panel 10, avoiding affecting the display effect of the display module 100. In addition, the barrier structure 12 can also prevent water vapor and oxygen from penetrating into the display area 101 of the display panel 10 from the through hole 11, avoiding the display defects such as dark spots.

[0100] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0101] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0102] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display module, characterized in that: include: The display panel comprises a display area and an opening area, wherein the display area at least partially surrounds the opening area; A through hole, located in the opening area and passing through the display panel; The barrier structure is located in the opening area and is arranged around the through hole, and the barrier structure is used to block light and water vapor.

2. The display module according to claim 1, characterized in that: The barrier structure comprises a cutting groove and functional glue, and the functional glue is filled in the cutting groove; Preferably, the cutting groove comprises an annular groove structure surrounding the through hole; Preferably, the width of the cutting groove is comprised between 20um and 1mm.

3. The display module according to claim 1, characterized in that: The display module comprises a blocking portion, the blocking portion is located in the opening area, and the blocking portion is arranged between the through hole and the blocking structure; Preferably, the blocking portion comprises an annular structure surrounding the through hole.

4. The display module according to claim 2, characterized in that: The length extension direction of the cutting groove on the first section is arranged at a preset angle with the display panel, wherein the first section is perpendicular to the plane where the display panel is located; Preferably, the preset angle is greater than or equal to 10 degrees and less than or equal to 90 degrees.

5. The display module according to claim 2, characterized in that: The functional glue comprises a single-layer structure; or, The functional glue comprises a multi-layer structure, and the functional glue comprises a stacked waterproof vapor layer and a light absorbing layer; Preferably, the functional glue includes at least one of silicone glue, epoxy glue or acrylic glue; Preferably, the functional glue includes black glue.

6. The display module according to claim 2, characterized in that: The display module comprises a composite tape layer, the composite tape layer is arranged on the backlight side of the display panel, and one end of the cutting groove is arranged on the composite tape layer; Preferably, the cutting groove is a conical annular groove structure; the orthographic projection of one end of the cutting groove close to the composite tape layer on the composite tape layer is located on the inner side of the orthographic projection of one end of the cutting groove away from the composite tape layer on the composite tape layer.

7. The display module according to claim 1, characterized in that: The display module comprises a cover plate, and the cover plate is arranged on the light emitting side of the display panel; Preferably, the cover plate at least covers the display panel, the through hole and the barrier structure; Preferably, the display module comprises a polarizing layer, the polarizing layer is located between the display panel and the cover plate, and the through hole passes through the polarizing layer; Preferably, the display module comprises an optical adhesive layer, the optical adhesive layer is located between the cover plate and the display panel, and the through hole penetrates the optical adhesive layer; Preferably, the display module comprises a supporting layer, the supporting layer is located on a side of the display panel away from the cover plate, and the through hole penetrates the supporting layer.

8. A method for preparing a display module, characterized in that: The following steps are involved: Providing a display module to be cut, wherein the display module comprises a display panel; Cutting a cutting groove in the opening area of ​​the display panel, and injecting functional glue into the cutting groove to form a barrier structure; A through hole penetrating the display panel is cut in the barrier structure.

9. The method for preparing a display module according to claim 8, characterized in that: After the functional glue is injected into the cutting groove, the functional glue is cured to form the barrier structure; Preferably, injecting functional glue into the cutting groove comprises: Inject the functional glue into the cutting groove by inkjet printing, screen printing or glue spray valve; Preferably, curing the functional glue comprises: The functional glue in the cutting groove is cured by ultraviolet heating exposure.

10. A display device, characterized in that: Comprising a display module as described in any one of claims 1-7.

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