Display modules and display devices

Abstract

This disclosure relates to a display module and a display device. The display module includes a display area and a bonding area, as well as a bending area, a support structure, a first back film layer, and a second back film layer. The direction from the display area to the bending area is a first direction, which is parallel to the display surface of the display area. The bending area has a bending start position near the display area and a bending end position away from the display area. In the first direction, the first back film layer has a first end near the bending area, and the second back film layer has a fourth end near the bending area. There is a gap between the first end and the bending start position, and a gap between the fourth end and the bending end position. A polarizer is provided on the light-emitting side of the display area. In the first direction, the polarizer has a second end near the bending area, which is flush with the bending start position. A limiting support layer is provided on the side of the bonding area away from the support structure. The third end of the limiting support layer near the bending area is flush with the bending end position.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display product manufacturing, and in particular to a display module and a display device. BACKGROUND

[0002] With the popularization of full-screen mobile phones, the mobile phone frame is becoming narrower and narrower, and the radius of flexible screen in Pad Bending is becoming smaller and smaller. In small-radius Pad Bending (for example, the bending radius is 0.2mm-0.1mm), the bending strain of SD (metal line) will increase significantly, which is easy to cause metal line Crack problem, resulting in display abnormalities. SUMMARY

[0003] In order to solve the above technical problems, the present disclosure provides a display module and a display device, which solve the problem of easy breakage of metal lines caused by large strain force.

[0004] In order to achieve the above purpose, the technical scheme adopted by the embodiments of the present disclosure is as follows: a display module, comprising a display panel, the display panel comprising a display area and a binding area, and a bending area between the display area and the binding area, the bending area makes the binding area bend to the backlight side of the display area, when the bending area is in a bending state, the backlight side of the display area is provided with a first back film layer,

[0005] The direction from the display area to the bending area is a first direction, and the first direction is parallel to the display surface of the display area;

[0006] The bending area comprises a bending start position and a bending end position, the bending start position is connected with the display area, and the bending end position is connected with the binding area;

[0007] In the first direction, the first back film layer has a first end close to the bending area, and the first end has a gap with the bending start position;

[0008] The light-emitting side of the display area is provided with a polarizer, and in the first direction, the polarizer has a second end close to the bending area, and the second end is flush with the bending start position;

[0009] When the bending area is in a bending state, the side of the binding area away from the display area is provided with a limiting support layer, and a third end of the limiting support layer close to the bending area is flush with the bending end position.

[0010] Optionally, a support structure is arranged between the display area and the binding area, the first back film layer is arranged between the support structure and the display area, and the second back film layer is arranged between the support structure and the binding area;

[0011] In the first direction, the second back film layer has a fourth end close to the bending area, and a gap between the fourth end and the bending termination position.

[0012] Optionally, in the first direction, a distance between the first end and the bending initiation position is 100-300 um.

[0013] Optionally, in the first direction, a distance between the fourth end and the bending termination position is 100-500 um.

[0014] Optionally, further comprising a cover plate on the light-out side of the display panel, a normal projection of the first back film layer on the cover plate is within a normal projection of the polarizer on the cover plate.

[0015] Optionally, a normal projection of the second back film layer on the cover plate is within a normal projection of the polarizer on the cover plate.

[0016] Optionally, when the bending area is in the bending state, a normal projection of the second back film layer on the cover plate partially overlaps a normal projection of the limiting support layer on the cover plate.

[0017] Optionally, when the bending area is in the bending state, a normal projection of the second back film layer on the cover plate is on a side of a normal projection of the limiting support layer on the cover plate away from the bending area.

[0018] Optionally, in a second direction, the support structure has a first surface away from the display area, a side of the first surface away from the display area is provided with a buffer layer, the second back film layer at least partially covers the buffer layer, or the second back film layer is on a side of the buffer layer away from the bending area, the second direction is perpendicular to the first direction, and the second direction is parallel to a light-out direction of the display module.

[0019] Optionally, a normal projection of the limiting support layer on the cover plate partially overlaps a normal projection of the buffer layer on the cover plate.

[0020] Optionally, in the first direction, a gap is between the buffer layer and the bending termination position.

[0021] Optionally, in the first direction, the support structure has a third end close to the bending area, and the third end is flush with the first end.

[0022] Optionally, a normal projection of the support structure on the cover plate coincides with a normal projection of the first back film layer on the cover plate.

[0023] Optionally, in the second direction, the thickness of the limiting support layer is 50-200 um, the second direction is perpendicular to the first direction, and the second direction is parallel to the light-out direction of the display module.

[0024] Optionally, an optical adhesive layer is arranged between the polarizer and the cover plate, and a normal projection of the optical adhesive layer on the cover plate is located in a normal projection of the polarizer on the cover plate.

[0025] Optionally, in the first direction, the optical adhesive layer has a fourth end arranged close to the bending area, and the distance between the fourth end and the second end is 50-100 um.

[0026] Optionally, when the bending area is in the bending state, the outer side of the bending area away from the support structure is not covered by a protective layer, and the inner side of the bending area away from the support structure is provided with a protective structure.

[0027] Optionally, in the second direction, the cross-sectional shape of the protective structure is circular or elliptical, the second direction is perpendicular to the first direction, and the second direction is parallel to the light-out direction of the display module.

[0028] Optionally, a preset adhesive layer in a semi-cured state is formed on the bending area before the bending area is bent, and the protective structure is formed by moisture absorption and curing of the preset adhesive layer in the natural environment after the bending area is bent.

[0029] Optionally, the thickness of the preset adhesive layer is greater than or equal to the thickness of the first back film layer.

[0030] Optionally, the thickness of the preset adhesive layer is greater than the thickness of the first back film layer, and the cross section of the protective structure in the direction perpendicular to the first back film layer is elliptical when the bending area is in the bending state.

[0031] Optionally, the thickness of the preset adhesive layer is equal to the thickness of the first back film layer, and the cross section of the protective structure in the direction perpendicular to the first back film layer is semicircular when the bending area is in the bending state.

[0032] Optionally, the diameter of the protective structure is less than the distance between the first end of the first back film layer and the bending termination position.

[0033] The display device provided by the embodiments of the present disclosure comprises the display module.

[0034] The beneficial effects of this disclosure are: both the first back film layer and the second back film layer are recessed, so that there is a gap between the first back film layer and the bending start position of the bending area, and a gap between the second back film layer and the bending end position of the bending area, thereby reducing the strain force on the metal wire during bending and preventing the metal wire from breaking. The bending start position and bending end position of the bending area are determined by the outward expansion of the polarizer and the limiting support layer provided on the side of the bonding area away from the support structure, thus ensuring the bending morphology of the bending area. Attached Figure Description

[0035] Figure 1 This diagram illustrates the structure of a display module in the related technology. Figure 1 ;

[0036] Figure 2 This diagram illustrates the structure of a display module in the related technology. Figure 2 ;

[0037] Figure 3 This diagram illustrates the structure of a display module in the related technology. Figure 3 ;

[0038] Figure 4 This diagram illustrates the structure of the display module in the embodiments of this disclosure. Figure 1 ;

[0039] Figure 2 This diagram illustrates the structure of the display module in the embodiments of this disclosure. Figure 4 . Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure are within the scope of protection of this disclosure.

[0041] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] refer toFigure 5 and Figure 4 This embodiment provides a display module, including a display area 11 and a bonding area 12, and a bending area 13 located between the display area 11 and the bonding area 12. The bending area 13 causes the bonding area 12 to bend to the backlight side of the display area 11. When the bending area 13 is in a bent state, a support structure 3 is provided between the display area 11 and the bonding area 12. A first back film layer 2 is provided between the support structure 3 and the display area 11, and a second back film layer 4 is provided between the support structure 3 and the bonding area 12.

[0043] The direction from the display area 11 to the bending area 13 is the first direction (reference). Figure 5 The X direction in the display area 11 is parallel to the display surface of the display area 11.

[0044] The bending area 13 has a bending start position close to the display area 11 (reference). Figure 5 The position indicated by the dashed line 100) and the bend termination position away from the display area 11 (reference) Figure 1 (The position indicated by the dashed line 200), the starting position of the bend is connected to the display area, and the ending position of the bend is connected to the binding area;

[0045] In the first direction, the first back film layer 2 has a first end near the bending region 13, and there is a gap between the first end and the bending start position;

[0046] A polarizer 5 is provided on the light-emitting side of the display area 11. In the first direction, the polarizer 5 has a second end close to the bending area 13. The second end is flush with the bending start position (here, "flush" means that the side of the polarizer 5 close to the bending area 13 is on the same plane as the bending start position. This plane is perpendicular to the display area. It should be noted that "flush" here can refer to flush with process error, rather than absolute flush).

[0047] When the bending area 13 is in a bent state, a limiting support layer is provided on the side of the binding area 12 opposite to the display area. The third end of the limiting support layer near the bending area 13 is flush with the bend termination position (here, "flush" means that the side of the limiting support layer near the bending area and the bend termination position are on the same plane, and this plane is perpendicular to the display area. It should be noted that "flush" here can refer to flush with process tolerances, rather than absolute flush). Reference Figure 1 In related technologies, the bending start position of the bending region 13 is determined by the first backing film layer 2 (refer to...). Figure 1and the first back film layer 2 is located on the inner side of the bending area 13 (when the bending area 13 is in the bending state, the first back film layer 2 is located between the display area 11 and the binding area 12), and in order to prevent the first back film layer from deforming when the bending area is bent to affect the bending shape of the bending area, the modulus of the first back film layer 2 is relatively high, so that when the bending area 13 is in the bending state, the bending stress of the bending starting position of the bending area 13 is relatively large, and since one end of the first back film layer 2 is flush with the bending starting position of the bending area, the first back film layer 2 exerts a counterforce on the bending starting position of the bending area in the bending state of the bending area, so that the metal wire located at the bending starting position is prone to breakage. Figure 5 and Figure 1 In order to solve this problem, in the embodiment, the first back film layer 2 is arranged to be inwardly retracted, that is, in the first direction, the first end of the first back film layer 2 close to the bending area 13 is moved away from the bending area, so that in the first direction, the first back film layer 2 has a first end close to the bending area 13, and a gap between the first end and the bending starting position, so as to reduce the bending stress at the bending starting position, thereby avoiding the breakage of the metal wire distributed on the bending area 13.

[0048] In order to ensure the bending shape of the bending area 13, in the embodiment, the polarizer 5 located on the light-emitting side of the display area 11 is arranged to be outwardly expanded, and in the first direction, the polarizer 5 has a second end close to the bending area 13, and the second end is flush with the bending starting position, so as to determine the bending starting position when the bending area 13 is bent, and a limiting support layer 8 is arranged on the side of the binding area 12 away from the support structure 3, and the third end of the limiting support layer 8 close to the bending area 13 is flush with the bending ending position, so as to determine the bending ending position when the bending area 13 is bent. Since the polarizer 5 is located on the light-emitting side of the display area 11, and the limiting support layer 8 is located on the side of the binding area 12 away from the support structure 3 when the bending area 13 is in the bending state (the polarizer 5 and the limiting support layer 8 are located on the same side of the display module when the bending area 13 is in the flat state), in this way, the polarizer 5 and the limiting support layer 8 cooperate to limit the length of the bending area 13, ensure the bending shape of the bending area 13, and will not increase the bending stress of the bending starting position and the bending ending position.

[0049] In the first direction, the second back film layer 4 has a fourth end close to the bending area 13, and a gap between the fourth end and the bending ending position;

[0050] In related technologies, the bending termination position of the bending region 13 is determined by the second back film layer 4 (see reference). Figure 1 (As indicated by the dotted line 200 in the diagram), when the bending area is in a bent state, the second back film layer 4 is located between the display area 11 and the bonding area 12. To prevent deformation of the second back film layer 4 during bending, which could affect the bending shape of the bending area, the second back film layer 4 has a high modulus. Therefore, when the bending area 13 is in a bent state, the bending stress at the bending termination position is large. Furthermore, one end of the second back film layer 4 is flush with the bending termination position of the bending area. Thus, in the bent state, the second back film layer 4 applies a reaction force to the bending termination position of the bending area, making the metal wire at the bending termination position prone to breakage. (Comparison) Figure 5 and Figure 4 To address this issue, in this embodiment, the second back film layer 4 is recessed. Specifically, in the first direction, the end of the second back film layer 4 closest to the bending area is moved away from the bending area, so that in the first direction, the second back film layer 4 has a fourth end close to the bending area 13. The fourth end has a gap with the bending termination position to reduce the bending stress at the bending termination position, thereby preventing the breakage of the metal wires distributed on the bending area 13.

[0051] In an exemplary embodiment, in the first direction, the distance between the first end and the bending start position is 100-300 μm.

[0052] In an exemplary embodiment, in the first direction, the distance between the fourth end and the beginning and end points of the bend is 100-500 μm.

[0053] In an exemplary embodiment, the display module further includes a cover plate 7 located on the light-emitting side of the display module, wherein the orthographic projection of the first back film layer 2 on the cover plate 7 is located within the orthographic projection of the polarizer 5 on the cover plate 7.

[0054] In the first direction, the first end of the first back film layer 2 near the bending area 13 is recessed to move away from the bending start position, while the second end of the polarizer 5 near the bending area 13 is expanded to be flush with the bending start position. Therefore, in the first direction, the second end is exposed beyond the first end, that is, the orthographic projection of the first back film layer 2 on the cover plate 7 is located within the orthographic projection of the polarizer 5 on the cover plate 7.

[0055] In an exemplary embodiment, the second back film layer 4 has a projection on the cover plate 7 which is within the projection of the polarizer 5 on the cover plate 7. Figure 4 In the AA display area, the area of the polarizer 5 is much larger than the area of the second back film layer 4. Figure 4 In the AA display area, the area of the polarizer 5 is much larger than the area of the second back film layer 4.

[0056] In the first direction, the second back film layer 4 is inwardly retracted near the fourth end of the bending area 13 to be away from the bending termination position, and the polarizer 5 is outwardly extended near the second end of the bending area 13 to be flush with the bending initiation position. In a second direction perpendicular to the first direction (the second direction is perpendicular to the display area 11), the projection of the bending initiation position on the cover plate 7 coincides with the projection of the bending termination position on the cover plate 7. Therefore, in the first direction, the projection of the second back film layer 4 on the cover plate 7 is within the projection of the polarizer 5 on the cover plate 7.

[0057] In the first direction, the second back film layer 4 is inwardly retracted relative to the polarizer 5, i.e., there is a gap between the second back film layer 4 and the bending termination position, and the limiting support layer 8 is flush with the bending termination position near the third end of the bending area 13. Therefore, the fourth end of the second back film layer 4 is located on the side of the third end of the limiting support layer 8 which is away from the bending area 13.

[0058] In an exemplary embodiment, the projection of the second back film layer 4 on the cover plate 7 is adjacent to the projection of the limiting support layer 8 on the cover plate 7.

[0059] In an exemplary embodiment, in the first direction, the projection of the second back film layer 4 on the cover plate 7 is located on the side of the projection of the limiting support layer 8 on the cover plate 7 which is away from the bending area 13.

[0060] In an exemplary embodiment, in the second direction (reference Y direction in Figure 4 In an exemplary embodiment, the support structure 3 has a first surface away from the display area 11 in the second direction (reference Y direction in

[0061] The distance between the second back film layer 4 and the bending termination position determines the positional relationship between the second back film layer 4 and the buffer layer 9. The buffer layer 9 can be deformed and can play a buffering role when the bending area 13 is bent, so as to avoid damage to the binding area. In addition, the buffer layer 9 also plays a role in enhancing the connection stability between the second back film layer 4 and the support structure 3.

[0062] It should be noted that when the second back film layer 4 is inwardly retracted in the direction close to the binding area relative to the bending termination position, the support structure 3 and the binding area have a suspended area. The buffer layer 9 is filled in the area (the buffer layer 9 has a gap with the bending termination position). When the bending area 13 is bent, the buffer layer 9 plays a role in supporting the binding area 12, so as to avoid damage to the binding area.

[0063] In an exemplary embodiment, the orthographic projection of the limiting support layer 8 on the cover plate 7 partially overlaps the orthographic projection of the buffer layer 9 on the cover plate 7. This avoids the situation that the limiting support layer 8 and the support structure 3 are suspended without support, and ensures the strength and stability of the binding area 12.

[0064] In an exemplary embodiment, in the first direction, the buffer layer 9 has a gap with the bending termination position. This avoids the situation that the bending stress at the bending termination position is increased due to the fact that the end of the buffer layer 9 close to the bending area is flush with the bending termination position.

[0065] In an exemplary embodiment, the end of the limiting support layer 8 away from the bending area is flush with the end of the buffer layer 9 away from the bending area (it should be noted that the flush here can mean flush with process errors, not absolute flush).

[0066] The buffer layer 9 can be made of various materials, for example, can be foam glue.

[0067] In an exemplary embodiment, in the first direction, the support structure 3 has a third end close to the bending area 13, and the third end is flush with the first end (it should be noted that the flush here means flush with process errors, not absolute flush).

[0068] In an exemplary embodiment, the orthographic projection of the support structure 3 on the cover plate 7 coincides with the orthographic projection of the first back film layer 2 on the cover plate 7.

[0069] In an exemplary embodiment, in the second direction (with reference to FIG. 1, the second direction is the direction perpendicular to the first direction), the support structure 3 has a fourth end close to the bending area 13, and the fourth end is flush with the second end (it should be noted that the flush here means flush with process errors, not absolute flush). Figure 1In the Y direction), the thickness of the limiting support layer 8 is 50-200 um, the second direction is perpendicular to the first direction, and the second direction is parallel to the light-emitting direction of the display module.

[0070] In an exemplary embodiment, an optical adhesive layer 6 is arranged between the polarizing sheet 5 and the cover plate 7, and the orthographic projection of the optical adhesive layer 6 on the cover plate 7 is located within the orthographic projection of the polarizing sheet 5 on the cover plate 7. That is, the area of the optical adhesive layer 6 is smaller than the area of the polarizing sheet 5, preventing overflow of the adhesive.

[0071] In an exemplary embodiment, in the first direction, the optical adhesive layer 6 has a fourth end arranged close to the bending area 13, and the distance between the fourth end and the second end is 50-100 um, but is not limited thereto.

[0072] In an exemplary embodiment, when the bending area 13 is in a bent state, the outer side of the bending area 13 away from the support structure 3 is not covered by a protective layer, and the inner side of the bending area 13 away from the support structure 3 is provided with a protective structure matching the shape of the bending area 13.

[0073] In the related art, the outer side of the bending area 13 away from the support structure 3 is covered by a protective layer 300, as shown in Figure 2 which plays a protective role for the bending area 13, but the presence of the protective adhesive 300 increases the bending stress of the bending area 13. In the present embodiment, the protective layer 300 is removed to release the bending stress.

[0074] The protective structure 10 arranged on the inner side of the bending area 13 away from the support structure 3 can enhance the impact resistance of the bending area 13.

[0075] In an exemplary embodiment, the cross-sectional shape of the protective structure 10 in the second direction is circular or elliptical, the second direction is perpendicular to the first direction, and the second direction is parallel to the light-emitting direction of the display module.

[0076] In an exemplary embodiment, a preset adhesive layer in a semi-cured state is formed on the bending area 13 before the bending area 13 is bent, and the protective structure 10 is formed by moisture curing in the natural environment after the bending area 13 is bent.

[0077] In an exemplary embodiment, the thickness of the preset adhesive layer is greater than or equal to the thickness of the first back film layer 2.

[0078] It should be noted that the preset adhesive layer is in a semi-cured state to facilitate deformation with the bending of the bending area, but the semi-cured state here is more than 80% cured and no longer has fluidity.

[0079] In an exemplary embodiment, the thickness h of the preset adhesive layer satisfies a≤h≤2a, and a is the thickness of the first back film layer.

[0080] In an exemplary embodiment, the thickness of the preset adhesive layer is greater than the thickness of the first back film layer, and the cross section of the protection structure in the direction perpendicular to the first back film layer is elliptical when the bending area is in the bent state.

[0081] In an exemplary embodiment, the thickness of the preset adhesive layer is equal to the thickness of the first back film layer, and the cross section of the protection structure in the direction perpendicular to the first back film layer is semicircular when the bending area is in the bent state.

[0082] In an exemplary embodiment, the diameter of the protection structure is less than the distance between the first end of the first back film layer and the bending termination position.

[0083] When the bending area 13 is in the flattened state, the adhesive material can be regin adhesive (resin adhesive, but not limited thereto) is coated on the side of the bending area 13 close to the support structure 3, and the thickness of the coated adhesive material in the second direction is greater than or equal to the thickness of the first back film layer 2. After the adhesive material is coated, it is cured by UV to form a preset adhesive layer with low modulus in a short time; when the bending area 13 is bent, the preset adhesive material deforms to form a state with a circular or elliptical cross section when the bending area 13 is in the bent state, and after the bending area 13 is bent, the protection structure 10 is cured by natural environment moisture to have high modulus.

[0084] It should be noted that the shape of the cross section of the protection structure 10 in the second direction is related to the thickness of the coated adhesive material, and the thickness consistent with the first back film layer 2 will form a semicircle, and the thickness of the coated adhesive material exceeding the first back film layer 2 will form an ellipse.

[0085] It should be noted that after the protection structure 10 is cured, it cooperates with the shape of the bending area, and here the cooperation means that the bending area is shaped, and the gap part formed by the bending of the bending area is completely filled to achieve better support for the bending area.

[0086] In an exemplary embodiment, the protection structure is made of PF (phenolic plastic), but not limited thereto.

[0087] In the exemplary embodiments, the support structure is made of aluminum plate or stainless steel, but is not limited thereto.

[0088] Figure 3 and Figure 2 are structural diagrams of display modules in the related art, respectively, Figure 3 and Figure 2 The display modules in and have different thicknesses in the light-out direction of the display modules, but the positions of the maximum bending stress of the bending regions are the positions indicated by the dashed circles in the corresponding diagrams, i.e., the bending termination positions (the bending initiation positions are not shown, but it can be understood that the bending stress at the bending initiation position is also large due to the setting of the back film layer). The following table shows the bending stress of the display modules in and in the present embodiment (the position of the maximum bending stress of the bending region of the display panel in the present embodiment is between the bending initiation position and the bending termination position). Figure 3 Figure 2 The following table shows the comparison results of the bending stress of the display modules in and in the present embodiment.

[0089]

[0090] From the above table, it can be seen that, compared with the display modules in and, the display module in the present embodiment has a reduced bending radius of the bending region and a reduced bending stress of the metal wire. Figure 3 ​

[0091] The present disclosure also provides a display device comprising the display module described above.

[0092] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the present disclosure, but the present disclosure is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also considered to be within the protection scope of the present disclosure.​​​

Claims

1. A display module, comprising a display panel, the display panel comprising a display area and a binding area, and a bending area between the display area and the binding area, the bending area enabling the binding area to bend to a backlight side of the display area, the display panel being provided with a first back film layer on the backlight side of the display area when the bending area is in a bending state, wherein, a direction from the display area to the bending area is a first direction, the first direction being parallel to a display surface of the display area; the bending area comprises a bending start position and a bending end position, the bending start position being connected to the display area, and the bending end position being connected to the binding area; in the first direction, the first back film layer has a first end close to the bending area, and a gap between the first end and the bending start position; the display area is provided with a polarizer on a light-out side of the display area, the polarizer having a second end close to the bending area in the first direction, the second end being flush with the bending start position; the binding area is provided with a limiting support layer on a side of the binding area away from the display module when the bending area is in the bending state, the limiting support layer having a third end close to the bending area, the third end being flush with the bending end position; wherein, a support structure is arranged between the display area and the binding area, the first back film layer is arranged between the support structure and the display area, and a second back film layer is arranged between the support structure and the binding area; in the first direction, the second back film layer has a fourth end close to the bending area, and a gap between the fourth end and the bending end position; in the first direction, a distance between the first end and the bending start position is 100-300 um; in the first direction, a distance between the fourth end and the bending end position is 100-500 um. A cover plate is further arranged on a light-out side of the display panel, a normal projection of the first back film layer on the cover plate is located within a normal projection of the polarizer on the cover plate. A normal projection of the second back film layer on the cover plate is located within the normal projection of the polarizer on the cover plate. When the bending area is in the bending state, a normal projection of the second back film layer on the cover plate partially overlaps a normal projection of the limiting support layer on the cover plate. When the bending area is in the bending state, the normal projection of the second back film layer on the cover plate is located on a side of the normal projection of the limiting support layer on the cover plate away from the bending area. In a second direction, the support structure has a first surface away from the display area, a buffer layer is arranged on a side of the first surface away from the display area, the second back film layer at least partially covers the buffer layer, or the second back film layer is located on a side of the buffer layer away from the bending area, the second direction being perpendicular to the first direction, and the second direction being parallel to a light-out direction of the display module. The normal projection of the limiting support layer on the cover plate partially overlaps the normal projection of the buffer layer on the cover plate. In the first direction, a gap is present between the buffer layer and the bending end position. ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The display module of claim 1, wherein, ​ 3. The display module of claim 2, wherein, ​ 4. The display module of claim 2, wherein, ​ 5. The display module of claim 2, wherein, ​ 6. The display module of claim 2, wherein, ​ 7. The display module of claim 6, wherein, ​ 8. The display module of claim 6, wherein, ​ 9. The display module of claim 1, wherein, In the first direction, the support structure has a third end close to the bending area, and the third end is flush with the first end.

10. The display module of claim 2, wherein, The support structure has a third end close to the bending area, and the third end is flush with the first end.

11. The display module of claim 1, wherein, In the second direction, the thickness of the limiting support layer is 50-200um, the second direction is perpendicular to the first direction, and the second direction is parallel to the light-out direction of the display module.

12. The display module of claim 2, wherein, An optical adhesive layer is arranged between the polarizer and the cover plate, and the orthographic projection of the optical adhesive layer on the cover plate is located within the orthographic projection of the polarizer on the cover plate.

13. The display module of claim 12, wherein, In the first direction, the optical adhesive layer has a fourth end close to the bending area, and the distance between the fourth end and the second end is 50-100um.

14. The display module of claim 1, wherein, When the bending area is in a bending state, the outer side of the bending area away from the support structure is not covered by a protective layer, and the inner side of the bending area away from the support structure is provided with a protective structure.

15. The display module of claim 14, wherein, In the second direction, the cross-sectional shape of the protective structure is circular or elliptical, the second direction is perpendicular to the first direction, and the second direction is parallel to the light-out direction of the display module.

16. The display module of claim 14, wherein, A preset adhesive layer in a semi-cured state is formed on the bending area before the bending area is bent, and the protective structure is formed by moisture absorption and curing of the preset adhesive layer after the bending area is bent.

17. The display module of claim 16, wherein, The thickness of the preset adhesive layer is greater than or equal to the thickness of the first back film layer.

18. The display module of claim 17, wherein, The thickness of the preset adhesive layer is greater than the thickness of the first back film layer, and when the bending area is in a bending state, the cross section of the protective structure in a direction perpendicular to the first back film layer is elliptical.

19. The display module of claim 17, wherein, The thickness of the preset adhesive layer is equal to the thickness of the first back film layer, and when the bending area is in a bending state, the cross section of the protective structure in a direction perpendicular to the first back film layer is semicircular.

20. The display module of claim 16, wherein, The diameter of the protective structure is less than the distance between the first end of the first back film layer and the bending termination position.

21. A display device, wherein, The display module of any one of claims 1-20.

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