Display module and display device

Abstract

The application discloses a display module, which comprises a plane area and a bending area, the bending area is located on both sides of the plane area; the display module comprises a protective film, a copper foil, a polyimide film layer, foam, a glue layer and a cover plate which are sequentially stacked, and the protective film is located on the side far from the light-emitting side of the cover plate; a cutting line is arranged at the joint position of the bending area and the plane area, the cutting line penetrates the protective film, the copper foil and the polyimide film layer along the light path direction, the cutting line is a discontinuous straight line and extends along a first direction; a plurality of stress release structures are arranged on the copper foil and the polyimide film layer in the bending area, the plurality of stress release structures are uniformly arranged on the copper foil and the polyimide film layer in the bending area, and the plurality of stress release structures are used for reducing the rebound stress of the copper foil and the polyimide film layer in the bending area due to bending.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a display module and a display device. Background Technology

[0002] Flexible OLED (Organic Light-Emitting Diode) display modules are a display technology based on flexible substrates. They are favored because they can achieve physical deformations such as bending, folding, rolling, and even stretching while maintaining stable display performance.

[0003] A composite film layer is typically applied to the back of a flexible OLED display module to shield it from light and protect the screen. This composite film layer generally includes a protective film, copper foil, and a polyimide film layer. However, because the protective film, copper foil, and polyimide film layer are all made of high-density and highly flexible materials, there is often significant springback force in the bending areas of the display module. This springback force frequently leads to peeling or delamination problems in the bending areas of the display module. Especially in high-temperature and high-humidity environments, peeling problems are more likely to occur in the bending areas of the display module, seriously affecting the yield rate of the display module. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a display module and a display device.

[0005] On one hand, the present invention provides a display module, including a planar area and a bent area, wherein the bent area is located on both sides of the planar area;

[0006] The display module includes a protective film, a copper foil, a polyimide film layer, foam, an adhesive layer and a cover plate stacked sequentially along the optical path direction, and the protective film is located on the side away from the light-emitting side of the cover plate;

[0007] A cutting line is provided at the junction of the bending area and the planar area. The cutting line penetrates the protective film, the copper foil and the polyimide film layer along the optical path direction. The cutting line is a discontinuous straight line and extends along the first direction.

[0008] Multiple stress-relieving structures are provided on both the copper foil and the polyimide film layer located in the bending area. The multiple stress-relieving structures are evenly arranged on the copper foil and the polyimide film layer in the bending area. The multiple stress-relieving structures are used to reduce the springback stress of the copper foil and the polyimide film layer in the bending area caused by bending.

[0009] As a further improvement of the present invention, the plurality of stress relief structures include at least one of through holes and strip grooves.

[0010] As a further improvement of the present invention, the plurality of stress relief structures are plurality of through holes, and the plurality of through holes are arranged in an array along the first direction.

[0011] As a further improvement of the present invention, the plurality of stress relief structures are a plurality of through holes, which are arranged in an array along a second direction, the second direction being perpendicular to the first direction.

[0012] As a further improvement of the present invention, the plurality of stress relief structures have a plurality of strip grooves, the plurality of strip grooves are arranged in an array along the first direction, and the extension direction of the strip grooves is perpendicular to the first direction.

[0013] As a further improvement of the present invention, the plurality of stress relief structures are a plurality of strip grooves, the plurality of strip grooves are arranged in an array along the second direction, and the extension direction of the strip grooves is parallel to the first direction, and the second direction is perpendicular to the first direction.

[0014] As a further improvement of the present invention, the end of the strip groove located on the copper foil does not contact the edge of the copper foil; and,

[0015] The end of the groove located on the polyimide film layer does not contact the edge of the polyimide film layer.

[0016] On the other hand, the present invention provides a display device including the display module as described above.

[0017] The beneficial effects of this invention are as follows: by setting a cutting line at the junction of the planar area and the bending area of ​​the display module, the influence of the planar area on the bending area can be reduced, thereby reducing the springback force of the bending area; furthermore, stress relief structures are provided on both the copper foil and the polyimide film layer within the bending area, which can further reduce the springback force of the bending area. Thus, under the combined action of the cutting line and the stress relief structure, the springback force of the bending area can be greatly reduced, thereby avoiding peeling or delamination problems caused by large springback forces in the bending area. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an exemplary display module of the present invention;

[0020] Figure 2 This is a cross-sectional view along direction AA as shown in Figure 1;

[0021] Figure 3 This is a schematic diagram of an exemplary stress relief structure.

[0022] Figure 4 This is a schematic diagram of another exemplary stress relief structure arrangement;

[0023] Figure 5 This is a schematic diagram of another exemplary stress relief structure arrangement;

[0024] Figure 6 This is a schematic diagram of another exemplary stress relief structure.

[0025] In the picture,

[0026] 100. Display module; 101. Planar area; 102. Bending area;

[0027] 10. Protective film; 20. Copper foil; 30. Polyimide film layer; 40. Foam; 50. Adhesive layer; 60. Cover plate; 70. Cutting line; 80. Through hole; 90. Strip groove. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, the terminology used in the description of this invention is for illustrative purposes only and is not intended to limit the scope of the invention. The terms "comprising" and / or "including" are used to specify the presence of said elements, steps, operations, and / or components, but do not exclude the presence or addition of one or more other elements, steps, operations, and / or components. The terms "first," "second," etc., may be used to describe various elements, do not represent an order, and do not limit these elements. Moreover, in the description of this invention, unless otherwise stated, "a plurality of" means two or more. These terms are used only to distinguish one element from another. These and / or other aspects become apparent in conjunction with the following drawings, and those skilled in the art will more readily understand the description of the embodiments of the invention. The drawings are used for illustrative purposes only to depict the embodiments of the invention. Those skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods shown in the invention can be employed without departing from the principles of the invention.

[0031] For ease of understanding, the X-axis in the attached figure represents the width direction of the display module, which is also the width direction of the display device, or the second direction; the Y-axis in the attached figure represents the height direction of the display module, which is also the height direction of the display device, or the first direction; and the Z-axis in the attached figure represents the thickness direction of the display module, which is also the thickness direction of the display device, or the optical path direction of the display module.

[0032] like Figure 1 As shown, a display module 100 according to an embodiment of the present invention includes a planar area 101 and a bent area 102, with the bent area 102 located on both sides of the planar area 101. It is easy to understand that the planar area 101 is located in the central region of the display module 100 and occupies a large proportion, serving as the main display area. In the width direction of the display module 100, the bent area 102 is located on both sides of the planar area 101, that is, the bent area 102 comprises two parts, one part located on the left side of the planar area 101 and the other part located on the right side of the planar area 101. The bent area 102 occupies a relatively small proportion and serves as an auxiliary display area. The bent area 102 can increase the area of ​​the display region to a certain extent, and also allows the display module to have more display forms. Of course, in use, the number of bent areas 102 can be increased according to display requirements. For example, two more bent areas 102 can be provided in the height direction of the display module 100, and these two bent areas 102 can be respectively located on the upper and lower sides of the planar area 101. This application mainly uses the example of the bending area 102 being located on the left and right sides of the planar area 101 for illustration.

[0033] Specifically, such as Figure 2As shown, the display module 100 includes a protective film 10, a copper foil 20, a polyimide film layer 30, foam 40, an adhesive layer 50, and a cover plate 60, which are sequentially stacked along the light path direction, with the protective film 10 located on the side away from the light-emitting side of the cover plate 60. That is, the protective film 10, copper foil 20, polyimide film layer 30, foam 40, adhesive layer 50, and cover plate 60 are sequentially stacked along the light emission direction, and the light ultimately exits from the upper surface of the cover plate 60. Adjacent layers of the protective film 10, copper foil 20, polyimide film layer 30, foam 40, and adhesive layer 50 can be bonded together with optical adhesive and ultimately bonded to the back of the cover plate 60 via the adhesive layer 50.

[0034] The protective film 10 primarily protects the display module 100 from scratches or friction by hard objects during manufacturing, transportation, or assembly. It also provides cushioning during handling to prevent damage from external pressure. The protective film 10 can be made of materials such as polyethylene terephthalate (PET), polyethylene (PE), or polyurethane (PU). It should be noted that the protective film 10 must be removed before assembling the display module 100 onto the display device. Therefore, when bonding the protective film 10 and the copper foil 10, a low-adhesion optical adhesive, such as one with an adhesion strength of 3 gf / inch to 6 gf / inch, can be used.

[0035] Copper foil 20 is integrated onto polyimide film layer 30 to form the flexible circuit of display module 100, and also has a heat dissipation function, improving the heat dissipation efficiency of display module 100. The thickness of copper foil 20 can be, for example, 9μm, 10μm, 12μm, 15μm, 16μm, or 18μm, etc. It can be adapted to the type and requirements of display module 100.

[0036] The polyimide film layer 30 serves as the "skeleton" of the display module 100, providing the display module 100 with relatively good mechanical flexibility, thereby enabling the display module 100 to be bent, rolled, or even folded.

[0037] Foam 40, as an elastic cushioning material, is mainly used to provide mechanical protection, stress dispersion, sealing and filling, and auxiliary assembly for the display module 100. Foam 40 can generally be made of polyurethane or silicone. Additionally, foam 40 can be black to provide some light-shielding properties for the display module 100.

[0038] The adhesive layer 50 is mainly used to bond the aforementioned film layers to the cover plate 60. The adhesive layer 50 is generally made of transparent optical adhesive to avoid affecting the display effect of the display module 100. Furthermore, the adhesive layer 50 can be configured in a grid pattern, which facilitates control of the adhesive amount at various locations, preventing uneven application and bonding failure. The grid pattern also helps to expel air bubbles from the adhesive layer 50, preventing bubble residue. The adhesive strength of the adhesive layer 50 can be set relatively high, for example, greater than 10 N / cm. 2 In this way, the adhesive layer 50 can not only be used for the curling or bending of the display module 100, but also avoid the problem of peeling and delamination of the display module 100 during the bending process as much as possible.

[0039] See Figures 3 to 6 A cutting line 70 is provided at the junction of the bending area 102 and the planar area 101 of the display module 100. The cutting line 70 penetrates the protective film 10, the copper foil 20 and the polyimide film layer 30 along the optical path direction. The cutting line 70 is a discontinuous straight line and extends along the first direction.

[0040] Taking the height direction of the display module 100 as an example, the boundary between the planar area 101 and the bending area 102 can be understood as the starting point where the display module 100 begins to curl, i.e., the display module 100 at this location is the first to bend or curl. Preferably, the cutting line 70 can be set on the boundary between the planar area 101 and the bending area 102, that is, the cutting line 70 and the boundary line coincide with each other. The cutting line 70 can separate the planar area 101 and the bending area 102 into two relatively independent parts, thereby reducing the force exerted by the planar area 101 on the bending area 102, i.e., reducing the "pulling" effect of the planar area 101 on the bending area 102. In this way, the rebound force generated by the "pulling" of the planar area 101 on the bending area 102 can be greatly reduced, significantly reducing the risk of delamination within the bending area 102.

[0041] It is understandable that the cutting line 70 has an appearance similar to a "dashed line". That is, the cutting line 70 passes through the protective film 10, the copper foil 20, and the polyimide film layer 30 at intervals. Taking the protective film 10 as an example, the cutting line 70 is set at the position where the protective film 10 begins to deform, and the cutting line 70 extends along the height direction of the protective film 10 and passes through the protective film 10 at intervals along the thickness direction of the protective film 10. There is a through portion between two adjacent through positions, so that there is a certain connection between the protective film 10 located in the planar area 101 and the protective film 10 located in the bending area 102. This connection portion allows the protective film 10 located in the planar area 101 to maintain a certain force on the protective film 10 located in the bending area 102, preventing the protective film 10 located in the planar area 101 and the protective film 10 located in the bending area 102 from being completely separated, that is, the protective film 10 located in the two areas would become completely independent parts, which would cause the protective film 10 located in the bending area 102 to separate from its adjacent film layer due to the smaller bonding area. The way the cutting line 70 is set on the copper foil 20 and the polyimide film layer 30 is exactly the same as the way it is set on the protective film 10. You can refer to the specific description of the way the cutting line 70 is set on the protective film 10, which will not be repeated here.

[0042] Optionally, the number of cutting lines 70 can be one or more. When the number of cutting lines 70 is set to multiple, the multiple cutting lines 70 can be arranged parallel to each other and all extend along the height direction of the display module 100; in addition, the multiple cutting lines 70 can be evenly arranged along the width direction of the display module 100 in the boundary area between the planar area 101 and the bending area 102, or the multiple cutting lines 70 can be appropriately placed closer to the bending area 102, which can more effectively reduce the resilience of the protective film 10, copper foil 20 and polyimide film layer 30 in the bending area 102. In use, the number of cutting lines 70 can be set according to the size of the display module 100, and this application does not specifically limit the number.

[0043] Preferably, the cutting line 70 penetrates the protective film 10, copper foil 20, and polyimide film 30 at the same position. This not only simplifies the processing but also more effectively reduces the resilience of the protective film 10, copper foil 20, and polyimide film 30 within the bending area 102. Of course, the cutting line 70 can also penetrate the protective film 10, copper foil 20, and polyimide film 30 at different positions. The appropriate position can be selected according to specific circumstances during use.

[0044] Furthermore, multiple stress-relieving structures are provided on both the copper foil 20 and the polyimide film layer 30 within the bending zone 102. These stress-relieving structures are evenly arranged on the copper foil 20 and polyimide film layer 30 within the bending zone 102. These structures are used to reduce the rebound stress generated by bending of the copper foil 20 and polyimide film layer 30 within the bending zone 102. The stress-relieving structures here are not limited to any specific structure; any structure that can effectively reduce the rebound stress of the copper foil 20 and polyimide film layer 30 within the bending zone 102 can be used as a stress-relieving structure. For example, the stress-relieving structure can be configured as a through hole or slot, reducing the area of ​​the copper foil 20 and polyimide film layer 30 within the bending zone 102, thereby reducing their rebound stress. Alternatively, the stress-relieving structure can be a stress-absorbing material, absorbing the rebound stress of the copper foil 20 and polyimide film layer 30 within the bending zone 102, thus reducing the rebound stress.

[0045] The following will describe the specific configuration of the stress relief structure through concrete implementation methods:

[0046] like Figure 3 As shown, the multiple stress relief structures are multiple through holes 80, which are arranged in an array along a first direction of the display module 100, such as the height direction of the display module 100. That is, multiple through holes 80 are provided on the copper foil 20 and polyimide film layer 30 located within the bending region 102, and the multiple through holes 80 are uniformly arranged along the height direction of the display module 100. Providing through holes 80 on the copper foil 20 and polyimide film layer 30 within the bending region 102 can significantly reduce the area of ​​the copper foil 20 and polyimide film layer 30 within the bending region 102, thereby greatly reducing the springback force of the copper foil 20 and polyimide film layer 30 within the bending region 102. This improves the problem of peeling or delamination in the bending region 102 due to springback force.

[0047] Specifically, the arrangement of vias parallel to the width direction of the display module 100 is referred to as a "row." Multiple vias 80 are arranged in multiple rows along the height direction of the display module 100, and are evenly distributed on the copper foil 20 and polyimide film layer 30 within the bending area 102 along the height direction of the copper foil 20 or polyimide film layer 30. This ensures that the rebound stress of the copper foil 20 and polyimide film layer 30 within the bending area 102 is uniform at all locations. Even though the rebound stress at each location is reduced, it avoids peeling or delamination problems that can occur in some locations where there is no through-hole 80 and therefore high rebound stress. The number of rows of vias 80 can be determined based on the height of the bending area 102; the higher the bending area 102, the more rows of vias 80 can be, and vice versa.

[0048] Optionally, the through holes 80 in adjacent rows can be arranged alternately or aligned. The choice can be made based on the specific circumstances. It should be noted that a certain gap is provided between the through holes 80 near the left and right edges of the copper foil 20 and the polyimide film layer 30 and their corresponding edges. This prevents the left and right edges of the copper foil 20 and the polyimide film layer 30 from being easily torn due to the through holes 80. It still allows operators to easily bond the copper foil 20 and the polyimide film layer 30 to adjacent film layers without causing the edges of the copper foil 20 and the polyimide film layer 30 to easily lift due to tearing. The specific size of this gap can be determined based on the width of the bending area 102, as long as sufficient through holes 80 are provided to alleviate springback stress and to ensure that the edges of the copper foil 20 and the polyimide film layer 30 are not easily torn. This application does not specifically limit the size of this gap.

[0049] like Figure 4 As shown, multiple stress relief structures are also configured with multiple through holes 80, and... Figure 3 The difference is that in this embodiment, the multiple through holes 80 are arranged in an array along a second direction, such as the width direction of the display module 100. That is, the multiple through holes 80 are arranged in an array along the width direction of the display module 100. Figure 3 The working principle of the through hole 80 shown is the same. Figure 4 The multiple through holes 80 shown can also greatly reduce the area of ​​the copper foil 20 and the polyimide film layer 30 located in the bending area 102, thereby greatly reducing the resilience of the copper foil 20 and the polyimide film layer 30 in the bending area 102. In this way, the problem of peeling or delamination of the bending area 102 due to the resilience is improved.

[0050] Specifically, the arrangement of vias parallel to the height of the display module 100 is called a "column." Multiple vias 80 are arranged in multiple columns along the width of the display module 100, and are evenly distributed on the copper foil 20 and polyimide film layer 30 within the bending area 102 along the width of the copper foil 20 or polyimide film layer 30. This ensures that the rebound stress of the copper foil 20 and polyimide film layer 30 within the bending area 102 is the same at all locations. Even if the rebound stress at each location is reduced, it avoids peeling or delamination problems that can occur in some locations where there is no through-hole 80 and therefore high rebound stress. The number of columns of through-hole 80 can be determined based on the width of the bending area 102; a wider bending area 102 allows for a greater number of columns of through-hole 80, and vice versa.

[0051] Optionally, the through holes 80 in two adjacent columns can be arranged alternately or aligned. The choice can be made according to the situation during use. It should be noted that a certain gap is provided between the through holes 80 near the upper and lower edges of the copper foil 20 and the polyimide film layer 30 and their corresponding edges. This prevents the upper and lower edges of the copper foil 20 and the polyimide film layer 30 from being easily torn due to the through holes 80. It still allows operators to easily bond the copper foil 20 and the polyimide film layer 30 to adjacent film layers, and prevents the edges of the copper foil 20 and the polyimide film layer 30 from easily lifting due to tearing. The specific size of this gap can be determined based on the height of the bending area 102, as long as sufficient through holes 80 are provided to alleviate springback stress and to ensure that the edges of the copper foil 20 and the polyimide film layer 30 are not easily torn. This application does not specifically limit the size of this gap.

[0052] It should be noted that when the stress relief structure is set as a through hole 80, the through hole 80 is only on the copper foil 20 and polyimide film layer 30 in the bending area 102, and is not provided on the protective film 10. In this way, it can be ensured that the protective film 10 provides sufficient protection for the display module 100, preventing foreign objects such as dust from the external environment from entering the display module 100 through the through hole 80; and also preventing the display module 100 from being worn or scratched at the position corresponding to the through hole 80.

[0053] Alternatives, such as Figure 5 As shown, multiple stress-relief structures have multiple strip grooves 90 arranged in an array along a first direction, with the extension direction of the strip grooves 90 perpendicular to the first direction. The first direction is, for example, the height direction of the display module 100, and the extension direction of the strip grooves 90 is the width direction of the display module 100. That is, multiple strip grooves 90 are provided on the copper foil 20 and polyimide film layer 30 located within the bending area 102, and the multiple strip grooves 90 are uniformly arranged along the height direction of the display module 100. Providing strip grooves 90 on the copper foil 20 and polyimide film layer 30 within the bending area 102 can significantly reduce the area of ​​the copper foil 20 and polyimide film layer 30 within the bending area 102, thereby greatly reducing the springback force of the copper foil 20 and polyimide film layer 30 within the bending area 102. This improves the problem of peeling or delamination in the bending area 102 due to springback force.

[0054] Specifically, the extension direction of the stripe 90 is defined as the direction parallel to the width of the display module 100. The distance the stripe 90 extends in this direction can be understood as the length of the stripe 90, and the distance the stripe 90 extends in the height direction of the display module 100 can be understood as the width of the stripe 90. Multiple stripes 90 are arranged along the height direction of the display module 100 and are uniformly distributed on the copper foil 20 and polyimide film layer 30 within the bending area 102 along the height direction of the copper foil 20 or polyimide film layer 30. This ensures that the rebound stress of the copper foil 20 and polyimide film layer 30 within the bending area 102 is the same at all locations. Even if the rebound stress at each location is reduced, it avoids the problem of peeling or delamination that can still occur in some locations where there is no stripe 90 and there is significant rebound stress. The number of slots 90 can be determined based on the height of the bending area 102. The higher the height of the bending area 102, the more slots 90 can be added, and vice versa.

[0055] It is easy to understand that the stripe 90 can, for example, use the position of the cut line 70 as the starting point for its extension. Taking the stripe 90 located on the copper foil 20 as an example: for instance, the stripe 90 can start its extension from the cut line 70 on the copper foil 20, and then extend along the width direction of the display module 100 towards the edge of the copper foil 20; the distance extended is the length of the stripe 90. The stripe 90 located on the polyimide film layer 30 is configured in the same way, and will not be described further here.

[0056] It should be noted that the length of the groove 90 is less than the width of the bending area 102. This means that a certain gap is provided between the end of the groove 90 (i.e., the end furthest from the cut line 70) and the left and right edges of the copper foil 20 and the polyimide film layer 30. This facilitates the bonding of the copper foil 20 and the polyimide film layer 30 to adjacent film layers and prevents the edges of the copper foil 20 and the polyimide film layer 30 from easily lifting. If the end of the groove 90 extends to the left and right edges of the copper foil 20 and the polyimide film layer 30, the copper foil 20 and the polyimide film layer 30 located in the bending area 102 will be divided into multiple independent parts by the groove 90. This not only makes bonding the copper foil 20 and the polyimide film layer 30 to adjacent layers very difficult, but also makes the divided parts prone to lifting.

[0057] The specific size of the gap between the end of the groove 90 and the edge of the copper foil 20 and the polyimide film layer 30 can be determined according to the width of the bending area 102. As long as the length of the groove 90 is sufficient to alleviate the springback stress, and the copper foil 20 and the polyimide film layer 30 in the bending area 102 are not divided into multiple independent parts by the groove 90, this application does not specifically limit the size of the gap.

[0058] Preferably, the number, position, and size of the strip grooves 90 on the copper foil 20 and the strip grooves 90 on the polyimide film layer 30 are the same. This not only facilitates processing but also ensures that the adhesive coating areas of the copper foil 20 and the polyimide film layer 30 are the same, guaranteeing a strong bond between them.

[0059] like Figure 6 As shown, multiple stress relief structures are also configured as multiple strip grooves 90, and... Figure 5 The difference lies in that multiple strip slots 90 are arranged in an array along a second direction, and the extension direction of the strip slots 90 is parallel to the first direction, while the second direction is perpendicular to the first direction. The first direction is, for example, the height direction of the display module 100, and the second direction is, for example, the width direction of the display module 100. That is, multiple strip slots 90 are arranged in an array along the width direction of the display module 100, and the strip slots 90 extend along the height direction of the display module 100. The working principle of the multiple strip slots 90 is similar to... Figure 5 The working principle of the groove 90 is the same. That is, by setting the groove 90 on the copper foil 20 and the polyimide film layer 30 in the bending area 102, the area of ​​the copper foil 20 and the polyimide film layer 30 in the bending area 102 can be greatly reduced, thereby greatly reducing the rebound force of the copper foil 20 and the polyimide film layer 30 in the bending area 102. In this way, the problem of peeling or delamination in the bending area 102 due to the rebound force is improved.

[0060] Specifically, the extension direction of the stripe 90 is defined as the direction parallel to the height of the display module 100. The distance the stripe 90 extends in this direction can be understood as the length of the stripe 90, and the distance the stripe 90 extends in the width direction of the display module 100 can be understood as the width of the stripe 90. Multiple stripes 90 are arranged along the width direction of the display module 100 and are uniformly distributed on the copper foil 20 and polyimide film layer 30 within the bending area 102 along the width direction of the copper foil 20 or polyimide film layer 30. In this way, the rebound stress of the copper foil 20 and polyimide film layer 30 located within the bending area 102 is made the same at all locations. Even though the rebound stress at each location is reduced, it avoids the problem of peeling or delamination that can still occur in some locations where there is no stripe 90 and there is high rebound stress. The number of strip grooves 90 can be determined based on the width of the bending area 102. The wider the bending area 102, the more strip grooves 90 can be added, and vice versa.

[0061] It should be noted that the length of the groove 90 is less than the height of the bending area 102. Taking the groove 90 located on the copper foil 20 as an example: there is a certain gap between the upper end of the groove 90 and the upper edge of the copper foil 20, and there is a certain gap between the lower end of the groove 90 and the lower edge of the copper foil 20. That is, the ends of the groove 90 do not contact the corresponding edges of the copper foil 20. In this way, it is convenient for operators to bond the copper foil 20 to its adjacent film layer (e.g., polyimide film layer 30), and it will not cause the edges of the copper foil 20 and the polyimide film layer 30 to easily lift. If the upper end of the groove 90 extends to the upper edge of the copper foil 20, or the lower end of the groove 90 extends to the lower edge of the copper foil 20, the copper foil 20 located in the bending area 102 will be divided into multiple independent parts by the groove 90. This will not only make it very difficult to bond the copper foil 20 to its adjacent layers, but will also make each of the divided parts prone to lifting.

[0062] The specific size of the gap between the upper and lower ends of the groove 90 and the upper and lower edges of the copper foil 20 can be determined according to the height of the bending area 102. As long as the length of the groove 90 is sufficient to alleviate the springback stress, and the copper foil 20 in the bending area 102 is not divided into multiple independent parts by the groove 90, this application does not make a specific limitation on the size of the gap.

[0063] Meanwhile, taking the groove 90 on the copper foil 20 as an example again: the groove 90 near the cutting line 70 is at a certain distance from the cutting line 70, so as to avoid the flat area 101 and the bending area 102 of the copper foil 20 being divided into independent parts by the groove 90, or to make the flat area 101 and the bending area 102 of the copper foil 20 only have a very small connection. At the same time, the groove 90 near the left and right edges of the copper foil 20 is also at a certain distance from its corresponding edge, so as to avoid the left and right edges of the copper foil 20 being cut off by the groove 90.

[0064] The distance between the strip groove 90 near the cutting line 70 and the cutting line 70, and the distance between the strip groove 90 near the left or right edge of the copper foil 20 and the corresponding edge of the copper foil 20, can be determined according to the width of the bending area 102. As long as it can be ensured that the copper foil 20 in the bending area 102 is not divided into multiple independent parts by the strip groove 90 or the edge is cut off, this application does not specifically limit the size of the gap.

[0065] The grooves 90 on the polyimide film layer 30 also have the same configuration, which can be referred to in the relevant description of the grooves 90 on the copper foil 20, and will not be repeated here.

[0066] Preferably, the number, position, and size of the strip grooves 90 on the copper foil 20 and the strip grooves 90 on the polyimide film layer 30 are the same. This not only facilitates processing but also ensures that the adhesive coating areas of the copper foil 20 and the polyimide film layer 30 are the same, guaranteeing a strong bond between them.

[0067] The display device described in this embodiment of the invention includes the display module 100 as described above. This display device can be, for example, any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0068] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0069] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the invention and form different embodiments.

[0070] Those skilled in the art will understand that although the invention has been described with reference to exemplary embodiments, various changes may be made and its elements may be substituted with equivalents without departing from the scope of the invention. Furthermore, many modifications may be made to adapt particular situations or materials to the teachings of the invention without departing from the essential scope of the invention.

Claims

1. A display module, characterized in that, It includes a planar area and a bending area, with the bending area located on both sides of the planar area; The display module includes a protective film, a copper foil, a polyimide film layer, foam, an adhesive layer and a cover plate stacked sequentially along the optical path direction, and the protective film is located on the side away from the light-emitting side of the cover plate; A cutting line is provided at the junction of the bending area and the planar area. The cutting line penetrates the protective film, the copper foil and the polyimide film layer along the optical path direction. The cutting line is a discontinuous straight line and extends along the first direction. Multiple stress-relieving structures are provided on both the copper foil and the polyimide film layer located in the bending area. The multiple stress-relieving structures are evenly arranged on the copper foil and the polyimide film layer in the bending area. The multiple stress-relieving structures are used to reduce the springback stress of the copper foil and the polyimide film layer in the bending area caused by bending.

2. The display module as described in claim 1, characterized in that, The plurality of stress relief structures include at least one of through holes and slots.

3. The display module as described in claim 2, characterized in that, The plurality of stress relief structures are plurality of through holes, which are arranged in an array along the first direction.

4. The display module as described in claim 2, characterized in that, The plurality of stress relief structures are plurality of through holes, which are arranged in an array along a second direction, which is perpendicular to the first direction.

5. The display module as described in claim 2, characterized in that, The plurality of stress relief structures have a plurality of strip grooves, which are arranged in an array along the first direction and the extension direction of the strip grooves is perpendicular to the first direction.

6. The display module as described in claim 2, characterized in that, The plurality of stress relief structures are plurality of strip grooves, which are arranged in an array along a second direction, and the extension direction of the strip grooves is parallel to the first direction, while the second direction is perpendicular to the first direction.

7. The display module as described in claim 5 or 6, characterized in that, The end of the groove located on the copper foil does not contact the edge of the copper foil; and, The end of the groove located on the polyimide film layer does not contact the edge of the polyimide film layer.

8. A display device, characterized in that, Includes the display module as described in any one of claims 1-7.

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