Display module, method for manufacturing a display module, and display device

Abstract

The present invention discloses a display module, a method for manufacturing the display module, and a display device. The display module includes a protective back film, a display panel, and a polarizer. The display panel is located between the protective back film and the polarizer. The display module is provided with an accommodation space penetrating through the polarizer, the display panel, and the protective back film. The protective back film is provided with a first through hole, the display panel is provided with a second through hole, and the polarizer is provided with a third through hole. The first through hole, the second through hole, and the third through hole define the accommodation space. The inner diameter of the second through hole is greater than or equal to the inner diameter of the first through hole, and the inner diameter of the second through hole is greater than or equal to the inner diameter of the third through hole. The accommodation cavity is used for placing optical devices including a camera. The design of the present invention can enhance the impact resistance of the display module during the assembly process. Specifically, the present invention can effectively protect the display panel and improve the problem of hole encapsulation failure caused by the display panel being easily impacted during the camera assembly process.

Description

Technical Field

[0001] The present invention belongs to the technical field of displays, and particularly relates to a display module, a method for manufacturing a display module, and a display device. Background Art

[0002] With the pursuit of the ultimate screen-to-body ratio, the form of the screen itself and the arrangement of the camera have been rapidly optimized. From the initial 50% screen-to-body ratio to the Notch layout, and even to the subsequent water-drop screen and hole-drilled screen, new display technologies emerge in an endless stream. Among them, the design of the hole-drilled screen greatly improves the screen-to-body ratio and meets the consumers' pursuit of large-screen displays.

[0003] In related technologies, the through holes in hole-drilled screen products are formed by laminating multiple film layers together and then integrally cutting them with a laser in the drilling area. However, in existing hole-drilled screen products, problems such as film layer peeling and packaging failure are likely to occur. Summary of the Invention

[0004] The present invention is made based on the inventor's discovery and understanding of the following facts and problems.

[0005] The inventor found that during the assembly process of hole-drilled screen products, problems such as film layer peeling and packaging failure are likely to occur because the edges of the through holes are uneven after the laser cutting is completed and the temperature drops to room temperature. Specifically, laser cutting is a thermal processing method, and a certain heat-affected zone will be formed on the cut surface of the material. Due to the different materials of the multi-layer structure, under the thermal influence during laser cutting, the thermal expansion coefficients of different layer materials are different. When the laser cutting is completed and the temperature drops to room temperature, the rebound distances of different layers are different. The inventor found that, referring to Figure 1 , on the microscopic cross-section of the final product, the display panel at the drilling area protrudes compared with the protective back film and the polarizer. The inventor believes that this is due to the small rebound amplitude of the display panel during the process of the laser integral cutting being completed and the temperature dropping to room temperature. Moreover, compared with the protective back film and the polarizer, the display panel is more fragile. Limited by the assembly accuracy, during the assembly process of the camera, the camera will exert a force on the hole boundary. Due to the protrusion of the display panel in the drilling area, the display panel will be the first to receive external forces during the assembly process of the camera, and it is easy to crack the display panel, resulting in hole packaging failure, and ultimately leading to problems such as film layer peeling, packaging failure, and the appearance of GDS (Growing dark spot) at the drilling position.

[0006] The present invention aims to at least partially improve at least one of the above technical problems.

[0007] To improve the above technical problems, the present invention provides a display module, which includes a protective back film, a display panel, and a polarizer. The display panel is located between the protective back film and the polarizer; the display module is provided with an accommodation space penetrating through the polarizer, the display panel, and the protective back film; the protective back film is provided with a first through hole, the display panel is provided with a second through hole, and the polarizer is provided with a third through hole. The first through hole, the second through hole, and the third through hole define the accommodation space; the inner diameter of the second through hole is greater than or equal to the inner diameter of the first through hole, and the inner diameter of the second through hole is greater than or equal to the inner diameter of the third through hole. The accommodation cavity is used to place optical devices including a camera. Thus, the design of the present invention can enhance the impact resistance of the display module during the assembly process. Specifically, the present invention can prevent the display panel in the drilling area from being in a convex state, effectively protect the display panel, and avoid the problem of hole encapsulation failure caused by the display panel being easily impacted during the camera assembly process.

[0008] According to an embodiment of the present invention, the difference between the radius of the second through hole and the radius of the first through hole is less than or equal to 8 microns; the difference between the radius of the second through hole and the radius of the third through hole is less than or equal to 8 microns. Thus, the display panel can be hidden between the safety barriers formed by the polarizer and the protective back film, effectively protecting the display panel and further improving the impact resistance of the display module.

[0009] According to an embodiment of the present invention, the display module further includes a cover plate, and the cover plate is located on the side of the polarizer away from the display panel. Thus, the polarizer and the display panel can be protected, which is beneficial to improving the stability and service life of the display module.

[0010] According to an embodiment of the present invention, the display module further includes a support layer and a heat dissipation layer. The support layer is located on the side of the protective back film away from the display panel, and the heat dissipation layer is located on the side of the support layer away from the protective back film; the support layer is provided with a fourth through hole, and the heat dissipation layer is provided with a fifth through hole; the inner diameter of the fourth through hole is equal to the inner diameter of the fifth through hole and the inner diameter of the first through hole. Since the through hole position is required to place the camera, such a design can reserve enough space for the camera and will not affect the comprehensive performance of the display module.

[0011] According to an embodiment of the present invention, the display module further includes a first adhesive layer, a second adhesive layer, a third adhesive layer, a fourth adhesive layer, and a fifth adhesive layer; the first adhesive layer is located between the cover plate and the polarizer, the second adhesive layer is located between the polarizer and the display panel, the third adhesive layer is located between the display panel and the protective back film, the fourth adhesive layer is located between the protective back film and the support layer, and the fifth adhesive layer is located between the support layer and the heat dissipation layer; a sixth through hole is provided on the first adhesive layer, a seventh through hole is provided on the second adhesive layer, an eighth through hole is provided on the third adhesive layer, a ninth through hole is provided on the fourth adhesive layer, and a tenth through hole is provided on the fifth adhesive layer; the inner diameter of the sixth through hole is equal to the inner diameter of the seventh through hole and the inner diameter of the third through hole, and the inner diameter of the eighth through hole is equal to the inner diameter of the ninth through hole, the inner diameter of the tenth through hole, and the inner diameter of the first through hole.

[0012] The present invention also provides a method for manufacturing a display module, the method comprising: forming a first through hole on the protective back film, a second through hole on the display panel, and a third through hole on the polarizer by means of multiple laser cutting, and placing the display panel having the second through hole between the protective back film having the first through hole and the polarizer having the third through hole to obtain a display module; wherein the number of laser cutting is greater than 1, the first through hole, the second through hole, and the third through hole define an accommodation space, and the accommodation space penetrates through the polarizer, the display panel, and the protective back film; the inner diameter of the second through hole is greater than or equal to the inner diameter of the first through hole, and the inner diameter of the second through hole is greater than or equal to the inner diameter of the third through hole. Thus, the display module prepared by this method has strong impact resistance and avoids the problem of hole encapsulation failure caused by the display panel being easily impacted during the camera assembly process.

[0013] According to an embodiment of the present invention, the cutting radius when forming the second through hole is greater than the cutting radius when forming the first through hole, and the cutting radius when forming the second through hole is greater than the cutting radius when forming the third through hole. Thus, after the cutting is completed and cooled to room temperature, it is possible to avoid the display panel in the punched area being in a convex state, which is beneficial to improving the problem that the convex display panel in the punched area is more vulnerable to impact.

[0014] According to an embodiment of the present invention, the difference between the cutting radius when forming the second through hole and the cutting radius when forming the first through hole is greater than or equal to 8 microns and less than or equal to 16 microns; the difference between the cutting radius when forming the second through hole and the cutting radius when forming the third through hole is greater than or equal to 8 microns and less than or equal to 16 microns. Thus, it is possible to improve the problem of hole encapsulation failure caused by the convex exposure of the display panel in the punched area.

[0015] According to an embodiment of the present invention, the method includes: performing hole cutting on a display panel to form a second through hole on the display panel; attaching a protective back film and a polarizer to opposite sides of the display panel having the second through hole respectively to form a composite structure, performing hole cutting on the composite structure, and making the cutting radius when performing hole cutting on the composite structure smaller than the cutting radius when performing hole cutting on the display panel, forming a first through hole on the protective back film and a third through hole on the polarizer to obtain a display module.

[0016] According to an embodiment of the present invention, the method includes: performing hole cutting on a protective back film to form a first through hole on the protective back film; performing hole cutting on a polarizer to form a third through hole on the polarizer; performing hole cutting on a display panel, and making the cutting radius when performing hole cutting on the display panel larger than the cutting radius when performing hole cutting on the protective back film and the cutting radius when performing hole cutting on the display panel larger than the cutting radius when performing hole cutting on the polarizer, forming a second through hole on the display panel; attaching the protective back film having the first through hole and the polarizer having the third through hole to opposite sides of the display panel having the second through hole respectively to obtain a display module.

[0017] According to an embodiment of the present invention, the method includes: performing hole cutting on a protective back film to form a first through hole on the protective back film; attaching the protective back film having the first through hole to a display panel, performing hole cutting on the display panel, and making the cutting radius when performing hole cutting on the display panel larger than the cutting radius when performing hole cutting on the protective back film, forming a second through hole on the display panel; attaching a polarizer to a side of the display panel having the second through hole away from the protective back film having the first through hole, performing hole cutting on the polarizer, and making the cutting radius when performing hole cutting on the polarizer smaller than the cutting radius when performing hole cutting on the display panel, forming a third through hole on the polarizer to obtain a display module.

[0018] According to an embodiment of the present invention, the method includes: performing hole cutting on a polarizer to form a third through hole on the polarizer; performing hole cutting on a display panel, and making the cutting radius when performing hole cutting on the display panel larger than the cutting radius when performing hole cutting on the polarizer, forming a second through hole on the display panel; attaching a protective back film to a side of the display panel having the second through hole, performing hole cutting on the protective back film, and making the cutting radius when performing hole cutting on the protective back film smaller than the cutting radius when performing hole cutting on the display panel, forming a first through hole on the protective back film; attaching the polarizer having the third through hole to a side of the display panel having the second through hole away from the protective back film having the first through hole to form a display module.

[0019] According to an embodiment of the present invention, the method further includes: forming a heat dissipation layer on one side of the support layer, forming the stacked support layer and the heat dissipation layer, integrally cutting the stacked support layer and the heat dissipation layer, making the cutting radius when performing hole cutting on the stacked structure equal to the cutting radius when performing hole cutting on the protective back film, to form a stacked structure with openings, wherein a fourth through hole is formed on the support layer, a fifth through hole is formed on the heat dissipation layer, and the inner diameter of the fourth through hole is equal to the inner diameter of the fifth through hole and the inner diameter of the first through hole; laminating the stacked structure with openings, the polarizer with the third through hole, the display panel with the second through hole, and the protective back film with the first through hole, such that the support layer with the fourth through hole is located between the protective back film with the first through hole and the heat dissipation layer with the fifth through hole, to obtain a display module.

[0020] According to an embodiment of the present invention, a first adhesive layer and a second adhesive layer are respectively attached to opposite sides of the polarizer, a third adhesive layer is attached to one side of the protective back film, and a fourth adhesive layer and a fifth adhesive layer are respectively attached to opposite sides of the support layer; the through holes on the first adhesive layer, the second adhesive layer, and the polarizer are formed by integral cutting, a sixth through hole is formed on the first adhesive layer, a seventh through hole is formed on the second adhesive layer, a third through hole is formed on the polarizer, and the inner diameter of the sixth through hole is equal to the inner diameter of the seventh through hole and the inner diameter of the third through hole; the through holes on the third adhesive layer and the protective back film are formed by integral cutting, an eighth through hole is formed on the third adhesive layer, a first through hole is formed on the protective back film, and the inner diameter of the eighth through hole is equal to the inner diameter of the first through hole; the through holes on the fourth adhesive layer, the fifth adhesive layer, the support layer, and the heat dissipation layer are formed by integral cutting, making the cutting radius when performing hole cutting equal to the cutting radius when performing hole cutting on the protective back film, a ninth through hole is formed on the fourth adhesive layer, a tenth through hole is formed on the fifth adhesive layer, a fourth through hole is formed on the support layer, a fifth through hole is formed on the heat dissipation layer, and the inner diameter of the ninth through hole is equal to the inner diameter of the tenth through hole, the inner diameter of the fourth through hole, the inner diameter of the fifth through hole, and the inner diameter of the first through hole.

[0021] The present invention also provides a display device, and the display device includes the display module described above. Thus, the display device has all the features and advantages of the display module described above, which will not be elaborated here. Generally speaking, the display device has strong impact resistance and avoids the problem of hole packaging failure caused during the camera assembly process.

[0022] According to an embodiment of the present invention, the display device further includes an optical device, and the optical device is located in the accommodation space of the display module.

[0023] According to an embodiment of the present invention, the optical device includes a camera. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of a display module in the related art;

[0025] Figure 2 is a schematic structural diagram of a display module in an embodiment of the present invention;

[0026] Figure 3 is a schematic structural diagram of a display module in another embodiment of the present invention;

[0027] Figure 4 is a schematic structural diagram of a display module in another embodiment of the present invention;

[0028] Figure 5 is a schematic structural diagram of a display module in another embodiment of the present invention;

[0029] Figure 6 is a schematic structural diagram of a display module in another embodiment of the present invention;

[0030] Figure 7 is a flowchart of a method for manufacturing a display module in an embodiment of the present invention;

[0031] Figure 8 is a flowchart of a method for manufacturing a display module in an embodiment of the present invention;

[0032] Figure 9 is a flowchart of a method for manufacturing a display module in another embodiment of the present invention;

[0033] Figure 10 is a flowchart of a method for manufacturing a display module in another embodiment of the present invention;

[0034] Figure 11 is a flowchart of a method for manufacturing a display module in another embodiment of the present invention;

[0035] Figure 12 is a flowchart of a method for manufacturing a display module in another embodiment of the present invention;

[0036] Figure 13 is a flowchart of a method for manufacturing a display module in another embodiment of the present invention;

[0037] Figure 14 is a flowchart of a method for manufacturing a display module in another embodiment of the present invention;

[0038] Figure 15 In an embodiment of the present invention, it is a schematic structural diagram of a display device.

[0039] Description of reference numerals

[0040] 100 - protective back film, 200 - display panel, 300 - polarizer, 400 - cover plate, 500 - support layer, 600 - heat dissipation layer, 700 - first adhesive layer, 800 - second adhesive layer, 900 - third adhesive layer, 1000 - fourth adhesive layer, 1100 - fifth adhesive layer, a - first through - hole, b - second through - hole, c - third through - hole, d - fourth through - hole, e - fifth through - hole, f - sixth through - hole, g - seventh through - hole, h - eighth through - hole, i - ninth through - hole, j - tenth through - hole, S - accommodation space, 500a - optical device. Detailed implementation manners

[0041] The embodiments of the present invention will be described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention. For those not specified in the embodiments regarding specific technologies or conditions, they shall be carried out according to the technologies or conditions described in the literature in the art or according to the product specifications. For reagents not specified by the manufacturer, they are all conventional products that can be obtained through commercial procurement.

[0042] The present invention provides a display module. Referring to Figure 2 and Figure 3 , the display module includes a protective back film 100, a display panel 200, and a polarizer 300. The display panel 200 is located between the protective back film 100 and the polarizer 300; the display module is provided with an accommodation space S penetrating through the polarizer 300, the display panel 200, and the protective back film 100; the protective back film 100 is provided with a first through - hole a, the display panel 200 is provided with a second through - hole b, and the polarizer 300 is provided with a third through - hole c. The first through - hole a, the second through - hole b, and the third through - hole c define the accommodation space S; the inner diameter of the second through - hole b is greater than or equal to the inner diameter of the first through - hole a, and the inner diameter of the second through - hole b is greater than or equal to the inner diameter of the third through - hole c. The accommodation cavity is used to place optical devices including a camera. Thus, the design of the present invention can enhance the impact resistance of the display module during the assembly process. Specifically, the present invention can improve the problem that the display panel 200 bulges in the punched area, can effectively protect the display panel 200, and avoid the problem of hole encapsulation failure caused by the display panel 200 being easily impacted during the camera assembly process.

[0043] The present invention does not limit the shapes of the first through - hole a, the second through - hole b, and the third through - hole c. For example, they can be at least one of a circular shape, an oval shape, a rectangular shape, a rounded - corner rectangular shape, and an irregular shape. The term "inner diameter" refers to the maximum dimension of the through - hole in the extending direction of the display panel.

[0044] In some embodiments of the present invention, referring to Figure 2 , when the inner diameter of the second through hole b is greater than the inner diameter of the first through hole a and the inner diameter of the second through hole b is greater than the inner diameter of the third through hole c, the design of the present invention can make the hole edges of the polarizer 300 and the protective back film 100 closer to the center of the accommodation space S than the hole edge of the display panel 200. In the punching area, the polarizer 300 and the protective back film 100 are in a protruding state, and the display panel 200 is in a sunken state and hidden between the safety barriers formed by the polarizer 300 and the protective back film 100, which can effectively protect the display panel 200 and avoid the problem that the display panel 200 is easily impacted during the camera assembly process.

[0045] In some other embodiments of the present invention, referring to Figure 3 , when the inner diameter of the second through hole b is equal to the inner diameter of the first through hole a and the inner diameter of the second through hole b is equal to the inner diameter of the third through hole c, the hole edge of the display panel 200 can be made flush with the hole edges of the protective back film 100 and the polarizer 300, and it can also improve the problem that the display panel 200 is more likely to be impacted when protruding at the punching position.

[0046] According to an embodiment of the present invention, the difference between the radius of the second through hole b and the radius of the first through hole a is less than or equal to 8 microns; the difference between the radius of the second through hole b and the radius of the third through hole c is less than or equal to 8 microns. That is to say, in the extending direction of the display panel 200 (the horizontal direction in the figure), the maximum distance that the protective back film 100 in the punching area exceeds the display panel 200 is 8 microns, and the maximum distance that the polarizer 300 in the punching area exceeds the display panel 200 is 8 microns. Thus, the display panel 200 can be hidden between the safety barriers formed by the polarizer 300 and the protective back film 100, and the display panel 200 can be effectively protected, further avoiding the problem that the display panel 200 is easily impacted during the camera assembly process. If the difference between the radius of the second through hole b and the radius of the first through hole a and the difference between the radius of the second through hole b and the radius of the third through hole c are too large, the size of the second through hole b on the display panel 200 will be too large and the sunken depth of the display panel 200 will be too large, resulting in too large an area of the non-display region and poor user experience.

[0047] It should be noted that the term "radius of the first through hole" refers to one-half of the "inner diameter of the first through hole", the term "radius of the second through hole" refers to one-half of the "inner diameter of the second through hole", and the term "radius of the third through hole" refers to one-half of the "inner diameter of the third through hole". The "radius" is only for convenience of description and does not mean that the shapes of the first through hole, the second through hole, and the third through hole are circular. The shapes of the first through hole, the second through hole, and the third through hole can be elliptical, rectangular, rounded rectangular, irregular, etc.

[0048] According to an embodiment of the present invention, with reference to Figure 4 , the display module further includes a cover plate 400, and the cover plate 400 is located on a side of the polarizer 300 away from the display panel 200. Thus, the cover plate 400 can protect the polarizer 300 and the display panel 200, preventing the display effect from being reduced due to damage to the polarizer 300 and the display panel 200 caused by external forces.

[0049] According to an embodiment of the present invention, with reference to Figure 5 , the display module further includes a support layer 500 and a heat dissipation layer 600. The support layer 500 is located on a side of the protective back film 100 away from the display panel 200, and the heat dissipation layer 600 is located on a side of the support layer 500 away from the protective back film 100; a fourth through hole d is provided on the support layer 500, and a fifth through hole e is provided on the heat dissipation layer 600; the inner diameter of the fourth through hole d is equal to the inner diameter of the fifth through hole e and the inner diameter of the first through hole a. Thus, since a camera needs to be placed at the position of the accommodation space S, through holes are provided on the support layer 500 and the heat dissipation layer 600, which can reserve an installation space for the camera.

[0050] According to an embodiment of the present invention, with reference to Figure 6 , the display module further includes a first adhesive layer 700, a second adhesive layer 800, a third adhesive layer 900, a fourth adhesive layer 1000, and a fifth adhesive layer 1100; the first adhesive layer 700 is located between the cover plate 400 and the polarizer 300, the second adhesive layer 800 is located between the polarizer 300 and the display panel 200, the third adhesive layer 900 is located between the display panel 200 and the protective back film 100, the fourth adhesive layer 1000 is located between the protective back film 100 and the support layer 500, and the fifth adhesive layer 1100 is located between the support layer 500 and the heat dissipation layer 600; a sixth through hole f is provided on the first adhesive layer 700, a seventh through hole g is provided on the second adhesive layer 800, an eighth through hole h is provided on the third adhesive layer 900, a ninth through hole i is provided on the fourth adhesive layer 1000, and a tenth through hole j is provided on the fifth adhesive layer 1100; the inner diameter of the sixth through hole f is equal to the inner diameter of the seventh through hole g and the inner diameter of the third through hole c, and the inner diameter of the eighth through hole h is equal to the inner diameter of the ninth through hole i, the inner diameter of the tenth through hole j, and the inner diameter of the first through hole a. Thus, by providing the adhesive layers, adjacent film layers can be tightly bonded together, which can improve the structural stability of the display module. Moreover, the first adhesive layer 700, the second adhesive layer 800, the third adhesive layer 900, the fourth adhesive layer 1000, and the fifth adhesive layer 1100 do not protrude relative to the display panel 200 either, and the problem of hole encapsulation failure will not be caused.

[0051] According to some embodiments of the present invention, the materials for forming the first adhesive layer 700, the second adhesive layer 800, the third adhesive layer 900, the fourth adhesive layer 1000, and the fifth adhesive layer 1100 may be OCA optical adhesives.

[0052] The present invention also provides a method for manufacturing a display module, the method comprising: forming a first through hole a in the protective back film 100, forming a second through hole b in the display panel 200, and forming a third through hole c in the polarizer 300 by means of multiple laser cuttings, so that the display panel 200 having the second through hole b is located between the protective back film 100 having the first through hole a and the polarizer 300 having the third through hole c to obtain a display module; wherein the number of laser cuttings is greater than 1, and the first through hole a, the second through hole b, and the third through hole c define an accommodation space S, and the accommodation space S penetrates through the polarizer 300, the display panel 200, and the protective back film 100; the inner diameter of the second through hole b is greater than or equal to the inner diameter of the first through hole a, and the inner diameter of the second through hole b is greater than or equal to the inner diameter of the third through hole c. Thus, the display module prepared by this method has strong impact resistance and avoids the problem of hole encapsulation failure caused by the display panel 200 being easily impacted during the camera assembly process.

[0053] It should be noted that although the method for manufacturing a display module is described by a plurality of steps recorded in sequence, the recorded order does not limit the order and time of executing the plurality of steps. When implementing the manufacturing method of the present invention, within the scope where the contents do not interfere with each other, the order of the plurality of steps can be changed, and in addition, a part or all of the execution times of the plurality of steps can also overlap with each other. For example, the times of the step of forming the first through hole a and the step of forming the third through hole c can be overlapped with each other.

[0054] In some embodiments of the present invention, the display module prepared by the above method has the same structure as the display module described above. Therefore, this method has all the features and advantages of the display module described above, which will not be elaborated herein.

[0055] In the related art, the through holes of the punched screen products are formed by laminating multiple layers together and then integrally cutting the punched area by laser. Referring to Figure 1 , the inventor found that on the microscopic cross-section of the cutting surface, the display panel in the punched area protrudes 8 micrometers compared to the protective back film and the polarizer. That is to say, when the laser cutting is completed and cooled to room temperature, the difference between the rebound distance of the display panel and the rebound distance of the polarizer, and the difference between the rebound distance of the display panel and the rebound distance of the protective back film are 8 micrometers.

[0056] According to an embodiment of the present invention, the cutting radius when forming the second through hole b is greater than the cutting radius when forming the first through hole a, and the cutting radius when forming the second through hole b is greater than the cutting radius when forming the third through hole c. Thus, after the cutting is completed and cooled to room temperature, it is possible to prevent the display panel 200 in the punched area from being in a convex state, which is beneficial to improving the problem that the display panel 200 is more vulnerable to impact at the punched position due to convexity.

[0057] It should be noted that the first through hole a, the second through hole b, and the third through hole c are all formed by laser cutting. The cutting radius when forming the first through hole a refers to the cutting radius when cutting a hole in the protective back film 100, the cutting radius when forming the second through hole b refers to the cutting radius when cutting a hole in the display panel 200, and the cutting radius when forming the third through hole c refers to the cutting radius when cutting a hole in the polarizer 300.

[0058] According to an embodiment of the present invention, the difference between the cutting radius when forming the second through hole b and the cutting radius when forming the first through hole a is greater than or equal to 8 μm and less than or equal to 16 μm; the difference between the cutting radius when forming the second through hole b and the cutting radius when forming the third through hole c is greater than or equal to 8 μm and less than or equal to 16 μm. Thus, the design of the present invention can effectively improve the problem that the display panel 200 bulges and is exposed due to the small rebound amplitude of the display panel 200 after laser cutting caused by the difference in the thermal expansion coefficients of the multi-layer materials of the module, and avoid the problem of the hole encapsulation failure caused by the display panel 200 being easily impacted during the camera assembly process. Specifically, when the difference between the cutting radius when forming the second through hole b and the cutting radius when forming the first through hole a is 16 μm, and the difference between the cutting radius when forming the second through hole b and the cutting radius when forming the third through hole c is 16 μm, due to the difference between the rebound distance of the display panel 200 and the rebound distance of the polarizer 300, and the difference between the rebound distance of the display panel 200 and the rebound distance of the protective back film 100 being 8 μm, when the laser cutting is completed and cooled to room temperature, the hole edge of the second through hole b can be located on the side of the hole edge of the first through hole a and the hole edge of the third through hole c away from the accommodation space S, and the distance between the hole edge of the second through hole b and the hole edge of the first through hole a is 8 μm, and the distance between the hole edge of the second through hole b and the hole edge of the third through hole c is 8 μm, that is, the display panel 200 in the punching area is in a sunken state, and the depth of the sink is 8 μm, which can effectively protect the display panel 200 and avoid the problem that the display panel 200 is easily impacted during the camera assembly process. Or when the difference between the cutting radius of the second through hole b and the cutting radius of the first through hole a is 8 μm, and the difference between the cutting radius of the second through hole b and the cutting radius of the third through hole c is 8 μm, due to the difference between the rebound distance of the display panel 200 and the rebound distance of the polarizer 300, and the difference between the rebound distance of the display panel 200 and the rebound distance of the protective back film 100 being 8 μm, when the laser cutting is completed and cooled to room temperature, the hole edge of the second through hole b can be flush with the hole edge of the first through hole a and the hole edge of the third through hole c, improving the problem that the display panel 200 is more likely to be impacted at the punching position and protrudes.

[0059] According to an embodiment of the present invention, referring to Figure 7 and Figure 8 , the method includes:

[0060] S110. Perform hole cutting on the display panel 200 to form a second through hole b on the display panel 200;

[0061] S120. Attach a protective back film 100 and a polarizer 300 to opposite sides of the display panel 200 having the second through hole b respectively to form a composite structure;

[0062] S130. Perform hole cutting on the composite structure, such that the cutting radius when performing hole cutting on the composite structure is smaller than the cutting radius when performing hole cutting on the display panel 200, to form a first through hole a on the protective back film 100 and a third through hole c on the polarizer 300, thereby obtaining the display module.

[0063] In this embodiment, through two-stage cutting, when the difference between the cutting radius when performing hole cutting on the display panel 200 and the cutting radius when performing hole cutting on the composite structure is greater than 8 μm and less than or equal to 16 μm, in the product after cutting and cooling to room temperature, the hole edges of the first through hole a and the third through hole c protrude compared to the hole edge of the second through hole b, and protrude towards the center of the accommodation space S. At this time, the display panel 200 in the punching area is in a sunken state and hidden between the safety barriers formed by the polarizer 300 and the protective back film 100, and the display panel 200 can be effectively protected, avoiding impact on the display panel 200 during the camera assembly process. Alternatively, when the difference between the cutting radius when performing hole cutting on the display panel 200 and the cutting radius when performing hole cutting on the composite structure is 8 μm, in the product after cutting and cooling to room temperature, the hole edges of the first through hole a and the third through hole c can be made flush with the hole edge of the second through hole b, improving the problem that the display panel 200 in the punching area is prone to being impacted due to protrusion.

[0064] According to an embodiment of the present invention, referring to Figure 9 and Figure 10 , the method includes:

[0065] S210. Perform hole cutting on the protective back film 100 to form a first through hole a on the protective back film 100;

[0066] S220. Perform hole cutting on the polarizer 300 to form a third through hole c on the polarizer 300;

[0067] S230. Perform hole cutting on the display panel 200, such that the cutting radius when performing hole cutting on the display panel 200 is greater than the cutting radius when performing hole cutting on the protective back film 100, and the cutting radius when performing hole cutting on the display panel 200 is greater than the cutting radius when performing hole cutting on the polarizer 300, to form a second through hole b on the display panel 200;

[0068] S240. Attach the protective back film 100 with the first through hole a and the polarizer 300 with the third through hole c on the two opposite sides of the display panel 200 with the second through hole b, respectively, to obtain the display module.

[0069] Specifically, by attaching the polarizer 300 to the light-emitting surface side of the display panel 200 and attaching the protective back film 100 to the backlight surface side of the display panel 200, the display module can be obtained.

[0070] According to an embodiment of the present invention, referring to Figure 11 and Figure 12 , the method includes:

[0071] S310. Perform hole cutting on the protective back film 100 to form a first through hole a on the protective back film 100;

[0072] S320. Attach the protective back film 100 with the first through hole a to the display panel 200, perform hole cutting on the display panel 200, and make the cutting radius when cutting the display panel 200 greater than the cutting radius when cutting the protective back film 100, so as to form a second through hole b on the display panel 200;

[0073] According to an embodiment of the present invention, by controlling the parameters of laser cutting, for example, by controlling the number of scans and the focal length, the cutting depth can be controlled to cut only a single film layer of the display panel 200.

[0074] S330. Attach the polarizer 300 to the side of the display panel 200 with the second through hole b away from the protective back film 100 with the first through hole a, perform hole cutting on the polarizer 300, and make the cutting radius when cutting the polarizer 300 less than the cutting radius when cutting the display panel 200, so as to form a third through hole c on the polarizer 300, and obtain the display module;

[0075] According to some embodiments of the present invention, the cutting radius when cutting the protective back film 100 is the same as the cutting radius when cutting the polarizer 300.

[0076] According to an embodiment of the present invention, referring to Figure 13 and Figure 14 , the method includes:

[0077] S410. Perform hole cutting on the polarizer 300 to form a third through hole c on the polarizer 300;

[0078] S420. Perform hole cutting on the display panel 200, and make the cutting radius when cutting the display panel 200 greater than the cutting radius when cutting the polarizer 300, so as to form a second through hole b on the display panel 200;

[0079] S430. Attach the protective back film 100 to one side of the display panel 200 having the second through hole b, and perform hole cutting on the protective back film 100, such that the cutting radius when performing hole cutting on the protective back film 100 is smaller than the cutting radius when performing hole cutting on the display panel 200, and form a first through hole a on the protective back film 100;

[0080] S440. Attach the polarizer 300 having the third through hole c to the side of the display panel 200 having the second through hole b that is away from the protective back film 100 having the first through hole a to form a display module.

[0081] According to an embodiment of the present invention, the method further includes:

[0082] Form a heat dissipation layer 600 on one side of the support layer 500 to form the support layer 500 and the heat dissipation layer 600 that are stacked, and perform integrated cutting on the stacked support layer 500 and heat dissipation layer 600, such that the cutting radius when performing hole cutting on the stacked structure is equal to the cutting radius when performing hole cutting on the protective back film 100, to form a stacked structure with an opening, wherein a fourth through hole d is formed on the support layer 500, a fifth through hole e is formed on the heat dissipation layer 600, and the inner diameter of the fourth through hole d is equal to the inner diameter of the fifth through hole e and the inner diameter of the first through hole a;

[0083] Bond the stacked structure with an opening to the polarizer 300 having the third through hole c, the display panel 200 having the second through hole b, and the protective back film 100 having the first through hole a, such that the support layer 500 having the fourth through hole d is located between the protective back film 100 having the first through hole a and the heat dissipation layer 600 having the fifth through hole e, to obtain Figure 5 the shown display module.

[0084] According to an embodiment of the present invention, referring to Figure 6 , first adhesive layers 700 and second adhesive layers 800 are respectively attached to opposite sides of the polarizer 300, a third adhesive layer 900 is attached to one side of the protective back film 100, and fourth adhesive layers 1000 and fifth adhesive layers 1100 are respectively attached to opposite sides of the support layer 500;

[0085] The through holes on the first adhesive layer 700, the second adhesive layer 800, and the polarizer 300 are formed by integrated cutting. A sixth through hole f is formed on the first adhesive layer 700, a seventh through hole g is formed on the second adhesive layer 800, and a third through hole c is formed on the polarizer 300. The inner diameter of the sixth through hole f is equal to the inner diameter of the seventh through hole g and the inner diameter of the third through hole c;

[0086] The through holes in the third adhesive layer 900 and the protective back film 100 are formed by integral cutting. An eighth through hole h is formed in the third adhesive layer 900, and a first through hole a is formed in the protective back film 100. The inner diameter of the eighth through hole h is equal to the inner diameter of the first through hole a.

[0087] The through holes in the fourth adhesive layer 1000, the fifth adhesive layer 1100, the support layer 500, and the heat dissipation layer 600 are formed by integral cutting. The cutting radius during hole cutting is made equal to the cutting radius when cutting holes in the protective back film 100. A ninth through hole i is formed in the fourth adhesive layer 1000, a tenth through hole j is formed in the fifth adhesive layer 1100, a fourth through hole d is formed in the support layer 500, and a fifth through hole e is formed in the heat dissipation layer 600. The inner diameter of the ninth through hole i is equal to the inner diameter of the tenth through hole j, the inner diameter of the fourth through hole d, the inner diameter of the fifth through hole e, and the inner diameter of the first through hole a.

[0088] The present invention also provides a display device, and the display device includes the display module described above. Thus, the display device has all the features and advantages of the display module described above, which will not be elaborated here. Generally speaking, the display device has strong impact resistance and avoids the problem of hole encapsulation failure caused during the camera assembly process.

[0089] According to an embodiment of the present invention, referring to Figure 15 , the display device further includes an optical device 500a, and the optical device 500a is located in the accommodation space S of the display module. Since the accommodation space S has a high light transmittance, placing the optical device 500a in the accommodation space S can enable the optical device 500a to receive sufficient optical signals, thereby making the display device have a good optical effect.

[0090] According to an embodiment of the present invention, the optical device 500a includes a camera. Thus, the display device can have the function of front camera shooting.

[0091] According to some embodiments of the present invention, the optical device 500a further includes a face recognition sensor. Thus, the display device can have the function of face recognition.

[0092] In the present invention, the specific type of the display device is not particularly limited. For example, the display device is a product with an image display function (including static images or dynamic images, where the dynamic image can be a video). For example, the display device can be any one of a monitor, a television, a billboard, a digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a computer, a painting screen, a Personal Digital Assistant (PDA), a digital camera, a portable video camera, a viewfinder, a navigator, a vehicle, a large-area wall, an information query device (such as a business query device in departments such as e-government, banks, hospitals, and power), a monitor, etc. Again, the display device can also be a microdisplay, or any one of a VR device or an AR device containing a microdisplay, etc.

[0093] It should be noted that in this specification, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, it should be understood that terms such as "connected" or "coupled" do not limit to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention.

[0094] In the description of this specification, the description with reference to terms such as "one embodiment", "another embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0095] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as a limitation on the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a display module, characterized in that, The method includes: By means of multiple laser cuttings, a first through hole is formed on the protective back film, a second through hole is formed on the display panel, and a third through hole is formed on the polarizer, so that the display panel with the second through hole is located between the protective back film with the first through hole and the polarizer with the third through hole, obtaining a display module; Wherein, the number of laser cuttings is greater than 1, the first through hole, the second through hole and the third through hole define a receiving space, and the receiving space penetrates through the polarizer, the display panel and the protective back film; the inner diameter of the second through hole is greater than or equal to the inner diameter of the first through hole, and the inner diameter of the second through hole is greater than or equal to the inner diameter of the third through hole; The cutting radius when forming the second through hole is greater than the cutting radius when forming the first through hole, and the cutting radius when forming the second through hole is greater than the cutting radius when forming the third through hole.

2. The method according to claim 1, wherein The difference between the cutting radius when forming the second through hole b and the cutting radius when forming the first through hole a is greater than or equal to 8 μm and less than or equal to 16 μm; The difference between the cutting radius when forming the second through hole and the cutting radius when forming the third through hole is greater than or equal to 8 μm and less than or equal to 16 μm.

3. The method according to any one of claims 1-2, characterized in that, The method includes: Performing hole cutting on the display panel to form a second through hole on the display panel; Attaching a protective back film and a polarizer to opposite sides of the display panel with the second through hole respectively to form a composite structure; Performing hole cutting on the composite structure, making the cutting radius when performing hole cutting on the composite structure less than the cutting radius when performing hole cutting on the display panel, forming a first through hole on the protective back film and a third through hole on the polarizer, obtaining a display module.

4. The method according to any one of claims 1-2, characterized in that, The method includes: Performing hole cutting on the protective back film to form a first through hole on the protective back film; Performing hole cutting on the polarizer to form a third through hole on the polarizer; Performing hole cutting on the display panel, making the cutting radius when performing hole cutting on the display panel greater than the cutting radius when performing hole cutting on the protective back film and the cutting radius when performing hole cutting on the display panel greater than the cutting radius when performing hole cutting on the polarizer, forming a second through hole on the display panel; Attaching the protective back film with the first through hole and the polarizer with the third through hole to opposite sides of the display panel with the second through hole respectively, obtaining a display module.

5. The method according to any one of claims 1-2, characterized in that, The method includes: Performing hole cutting on the protective back film to form a first through hole on the protective back film; Attaching the protective back film with the first through hole to the display panel, performing hole cutting on the display panel, making the cutting radius when performing hole cutting on the display panel greater than the cutting radius when performing hole cutting on the protective back film, forming a second through hole on the display panel; Attach the polarizer to the side of the display panel with the second through-hole away from the protective back film with the first through-hole, perform hole cutting on the polarizer, and make the cutting radius when performing hole cutting on the polarizer smaller than the cutting radius when performing hole cutting on the display panel, to form a third through-hole on the polarizer, thus obtaining a display module.

6. The method according to any one of claims 1-2, characterized in that, The method includes: Perform hole cutting on the polarizer to form a third through-hole on the polarizer; Perform hole cutting on the display panel, and make the cutting radius when performing hole cutting on the display panel larger than the cutting radius when performing hole cutting on the polarizer, to form a second through-hole on the display panel; Attach a protective back film to one side of the display panel with the second through-hole, perform hole cutting on the protective back film, and make the cutting radius when performing hole cutting on the protective back film smaller than the cutting radius when performing hole cutting on the display panel, to form a first through-hole on the protective back film; Attach the polarizer with the third through-hole to the side of the display panel with the second through-hole away from the protective back film with the first through-hole, to form a display module.

7. The method according to claim 1, characterized in that The method further includes: Form a heat dissipation layer on one side of the support layer to form the stacked support layer and the heat dissipation layer, perform integrated cutting on the stacked support layer and the heat dissipation layer, and make the cutting radius when performing hole cutting on the stacked structure equal to the cutting radius when performing hole cutting on the protective back film, to form a stacked structure with an opening, wherein a fourth through-hole is formed on the support layer, a fifth through-hole is formed on the heat dissipation layer, and the inner diameter of the fourth through-hole is equal to the inner diameter of the fifth through-hole and the inner diameter of the first through-hole; Bond the stacked structure with an opening to the polarizer with the third through-hole, the display panel with the second through-hole, and the protective back film with the first through-hole, so that the support layer with the fourth through-hole is located between the protective back film with the first through-hole and the heat dissipation layer with the fifth through-hole, to obtain a display module.

8. The method according to claim 7, wherein The first adhesive layer and the second adhesive layer are respectively attached to the opposite sides of the polarizer, the third adhesive layer is attached to one side of the protective back film, and the fourth adhesive layer and the fifth adhesive layer are respectively attached to the opposite sides of the support layer; The through-holes on the first adhesive layer, the second adhesive layer, and the polarizer are formed by integrated cutting. A sixth through-hole is formed on the first adhesive layer, a seventh through-hole is formed on the second adhesive layer, and a third through-hole is formed on the polarizer. The inner diameter of the sixth through-hole is equal to the inner diameter of the seventh through-hole and the inner diameter of the third through-hole; The through-holes on the third adhesive layer and the protective back film are formed by integrated cutting. An eighth through-hole is formed on the third adhesive layer, and a first through-hole is formed on the protective back film. The inner diameter of the eighth through-hole is equal to the inner diameter of the first through-hole; The through holes in the fourth adhesive layer, the fifth adhesive layer, the support layer, and the heat dissipation layer are formed by integral cutting, such that the cutting radius during hole cutting is equal to the cutting radius for hole cutting the protective back film. A ninth through hole is formed in the fourth adhesive layer, a tenth through hole is formed in the fifth adhesive layer, a fourth through hole is formed in the support layer, and a fifth through hole is formed in the heat dissipation layer. The inner diameter of the ninth through hole is equal to the inner diameters of the tenth through hole, the fourth through hole, the fifth through hole, and the first through hole.

9. A display module prepared by the method according to any one of claims 1-8, characterized in that, The display module includes a protective back film, a display panel, and a polarizer, and the display panel is located between the protective back film and the polarizer; The display module is provided with an accommodation space penetrating through the polarizer, the display panel, and the protective back film; The protective back film is provided with a first through hole, the display panel is provided with a second through hole, the polarizer is provided with a third through hole, and the first through hole, the second through hole, and the third through hole define the accommodation space; The inner diameter of the second through hole is greater than or equal to the inner diameter of the first through hole, and the inner diameter of the second through hole is greater than or equal to the inner diameter of the third through hole.

10. The display module according to claim 9, wherein, The difference between the radius of the second through hole and the radius of the first through hole is less than or equal to 8 micrometers; The difference between the radius of the second through hole and the radius of the third through hole is less than or equal to 8 micrometers.

11. The display module according to claim 9, wherein The display module further includes a cover plate, and the cover plate is located on the side of the polarizer away from the display panel.

12. The display module according to claim 11, wherein The display module further includes a support layer and a heat dissipation layer. The support layer is located on the side of the protective back film away from the display panel, and the heat dissipation layer is located on the side of the support layer away from the protective back film; The support layer is provided with a fourth through hole, and the heat dissipation layer is provided with a fifth through hole; The inner diameter of the fourth through hole is equal to the inner diameters of the fifth through hole and the first through hole.

13. The display module according to claim 12, wherein The display module further includes a first adhesive layer, a second adhesive layer, a third adhesive layer, a fourth adhesive layer, and a fifth adhesive layer; The first adhesive layer is located between the cover plate and the polarizer, the second adhesive layer is located between the polarizer and the display panel, the third adhesive layer is located between the display panel and the protective back film, the fourth adhesive layer is located between the protective back film and the support layer, and the fifth adhesive layer is located between the support layer and the heat dissipation layer; The first adhesive layer is provided with a sixth through hole, the second adhesive layer is provided with a seventh through hole, the third adhesive layer is provided with an eighth through hole, the fourth adhesive layer is provided with a ninth through hole, and the fifth adhesive layer is provided with a tenth through hole; The inner diameter of the sixth through hole is equal to the inner diameters of the seventh through hole and the third through hole, and the inner diameter of the eighth through hole is equal to the inner diameters of the ninth through hole, the tenth through hole, and the first through hole.

14. A display device, characterized in that, The display device includes the display module according to any one of claims 9 - 13.

15. The display device according to claim 14, wherein The display device further includes an optical device, and the optical device is located in the accommodation space of the display module.

16. The display device according to claim 15, wherein The optical device includes a camera.

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