Display module and display device

Abstract

Provided are a display module (100) and a display device. The display module (100) comprises a planar region (PD) and a curved region (BD) located outside the planar region (PD). A backplane (20) of the display module (100) comprises a planar portion (PP) arranged corresponding to the planar region (PD) and a curved portion (BP) arranged corresponding to the curved region (BD). A first groove (201) is formed on a corner (JP) of the curved portion (BP). The backplane (20) further comprises a first sub-backplane (21) and a second sub-backplane (22). The first groove (201) passes through the first sub-backplane (21). Thus, the problem of bubbles easily forming during lamination of Gaussian curved surfaces of an existing quad-curved screen is alleviated.

Description

Display module and display device Technical Field

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

[0002] With the development of display technology, curved screens have become a hot topic in the current display field. The curvature of the side of the curved screen can increase the display area, improve the screen-to-body ratio, and bring a better sensory experience to users. Curved screens include dual-curved screens formed by two opposite sides of the display screen having a certain curvature, and quad-curved screens formed by four sides of the display screen having a certain curvature. Compared with dual-curved screens, quad-curved screens have greatly improved performance in terms of screen-to-body ratio. Quad-curved screens are usually formed by bonding a display panel and a curved cover plate together. For a quad-curved screen, the intersection of two adjacent curved edges forms a Gaussian surface, and bubbles are prone to appear on the Gaussian surface after bonding. SUMMARY OF THE INVENTION

[0003] The present application provides a display module and a display device to alleviate the technical problem that the Gaussian surface of the existing four-curved screen is prone to bubbles after bonding.

[0004] To solve the above problems, the technical solutions provided by this application are as follows:

[0005] In a first aspect, an embodiment of the present application provides a display module comprising a planar area and a curved area located outside the planar area; the display module further comprises:

[0006] Display panel;

[0007] a backplane, disposed on a non-light-exiting side of the display panel, the backplane comprising a planar portion corresponding to the planar area and a curved portion corresponding to the curved area, the curved portion comprising a plurality of edges and a corner portion connecting two adjacent edges;

[0008] The backplane further includes a first sub-backplane and a second sub-backplane located on a side of the first sub-backplane close to the display panel. A first groove is provided on a side of the corner away from the display panel, and the first groove passes through the first sub-backplane.

[0009] In a second aspect, an embodiment of the present application provides a display device, which includes the display module of the aforementioned embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] FIG1 is a schematic diagram of bubbles generated by the Gaussian surface of a conventional four-curved screen.

[0012] FIG2 is a schematic diagram of the overall structure of the display module provided in an embodiment of the present application.

[0013] FIG3 is a schematic diagram of the disassembled structure of the display module in FIG2 .

[0014] FIG4 is a schematic diagram of the planar structure of the display module in FIG2 .

[0015] FIG5 is a schematic diagram of the cross-sectional structure along the MM' direction in FIG4 .

[0016] FIG6 is a schematic diagram of the detailed structure of point N in FIG4 .

[0017] FIG7 is a schematic diagram of the planar structure of the back plate in FIG3 .

[0018] FIG8 is a detailed schematic diagram of the setting position of the first groove provided in an embodiment of the present application.

[0019] FIG9 is a schematic diagram showing the principle of the first groove setting provided in an embodiment of the present application.

[0020] FIG10 is another schematic diagram of the planar structure of the display module provided in an embodiment of the present application.

[0021] FIG11 is another structural schematic diagram of the first groove provided in an embodiment of the present application.

[0022] FIG12 is another structural schematic diagram of the first groove provided in an embodiment of the present application. Modes for Carrying Out the Invention

[0023] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be implemented in. The directional terms mentioned in this application, such as [up], [down], [front], [back], [left], [right], [inside], [outside], [side], etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present application, rather than to limit the present application. In the figures, units with similar structures are represented by the same reference numerals. In the accompanying drawings, the thickness of some layers and areas is exaggerated for clarity of understanding and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily shown, but the present application is not limited to this.

[0024] In response to the problem that the Gaussian surface of the existing four-curved screen is prone to bubbles after bonding, the inventors of this application found in their research that the four-curved screen is usually formed by bonding a display panel with a back plate and a cover plate with a curved surface. The back plate is located on the side of the display panel away from the cover plate, and is used to support the display panel. The display panel and the cover plate are bonded together by transparent optical adhesive, which includes OCA adhesive and the like. There are horizontal and vertical curved overlapping areas at the four top corners of the four-curved screen. The display panel and the cover plate will be compressed when they are bonded into the curved overlapping area. The curved overlapping area is called the Gaussian angle area, and the curved surface of the curved overlapping area is called the Gaussian surface. When the display panel completely enters the Gaussian angle area, the Gaussian surface of the Gaussian angle area can be displayed, and a four-curved screen with a high screen-to-body ratio can be achieved. However, as the area of ​​the display panel entering the Gaussian angle region increases, the back panel and the display panel are subjected to greater compression. The greater the compression, the more likely the display panel is to have obvious wrinkles on the Gaussian surface when it is bonded to the cover plate, and the metal wiring and inorganic layer inside the display panel are more likely to have failure problems such as breakage. Moreover, referring to Figure 1, Figure 1 is a schematic diagram of bubbles generated on the Gaussian surface of the existing four-curved screen. After the display panel 1 is bonded to the cover plate 2, the back panel and the display panel 1 are subjected to a large amount of compression in the Gaussian angle region, and the back panel, as a support body for the display panel 1, has a high elastic modulus, so that the back panel will generate a large rebound force F. When the rebound force F is greater than the adhesion force of the transparent optical glue between the display panel 1 and the cover plate 2, the display panel 1 and the cover plate 2 will separate (peeling) in the Gaussian angle region, thereby causing rebound bubbles 4 to appear on the Gaussian surface 3.

[0025] To this end, the present application provides a display module and a display device to solve the above problems.

[0026] Specifically, an embodiment of the present application provides a display module, which includes a planar area and a curved area located outside the planar area; the display module further includes:

[0027] Display panel;

[0028] a backplane, disposed on a non-light-exiting side of the display panel, the backplane comprising a planar portion corresponding to the planar area and a curved portion corresponding to the curved area, the curved portion comprising a plurality of edges and a corner portion connecting two adjacent edges;

[0029] The backplane further includes a first sub-backplane and a second sub-backplane located on a side of the first sub-backplane close to the display panel. A first groove is provided on a side of the corner away from the display panel, and the first groove passes through the first sub-backplane.

[0030] In one embodiment, the thickness of the first sub-backplane and the second sub-backplane are both greater than or equal to 25 microns, and the thickness of the backplane is less than or equal to 200 microns.

[0031] In one embodiment, the elastic modulus of the backplate is greater than or equal to 3 GPa.

[0032] In one embodiment, the first groove extends from the corner to the side, and an extending length of the first groove at the side is shorter than an extending length of the first groove at the corner.

[0033] In one embodiment, the extension length of the first groove on the edge portion is greater than or equal to 0 mm and less than or equal to 1 mm.

[0034] In one embodiment, the width of the first groove is greater than 0 micrometer and less than or equal to 0.5 micrometer.

[0035] In one embodiment, a minimum distance between the first groove and the corner portion away from a boundary of the planar portion is greater than 0.

[0036] In one embodiment, in the direction from the planar portion to the corner portion, the arc length of the corner portion is L, and the distance between the first groove and the corner portion and the boundary of the planar portion is L', wherein 1 / 3L≤L'≤2 / 3L.

[0037] In one embodiment, L'=1 / 2L.

[0038] In one embodiment, the curved area includes a first display area and a border area located on a side of the first display area away from the flat area, and the first groove is provided corresponding to the first display area.

[0039] In one embodiment, a second groove is provided on a side of the edge portion facing away from the display panel, and the second groove is spaced apart from the first groove.

[0040] In one embodiment, the cross-sectional shape of the first groove includes at least one of an arc shape and a curve shape; and / or the cross-sectional shape of the second groove includes at least one of a straight line shape and a curve shape.

[0041] In one embodiment, the first groove includes a plurality of first sub-grooves arranged at intervals; and / or the second groove includes a plurality of second sub-grooves arranged at intervals.

[0042] In one embodiment, the display module further includes a protective layer and a supporting functional layer, wherein the protective layer is arranged on a side of the display panel away from the back plate, and the supporting functional layer is arranged on a side of the back plate away from the display panel.

[0043] An embodiment of the present application further provides a display device, which includes the display module of one of the aforementioned embodiments.

[0044] In the display module and display device provided in the present application, the display module includes a flat area and a curved area located outside the flat area; the display module also includes a display panel and a back panel arranged on the non-light-emitting side of the display panel, the back panel includes a flat portion arranged corresponding to the flat area and a curved portion arranged corresponding to the curved area, the curved portion includes a plurality of edges and a corner connected between two adjacent edges, a first groove is provided on the side of the corner facing away from the display panel, the back panel also includes a first sub-back panel and a second sub-back panel located on the side of the first sub-back panel close to the display panel, the first groove passes through the first sub-back panel, and the first groove can release the bending stress of the corner of the back panel to reduce the rebound force of the corner of the back panel, thereby reducing the risk of peeling off the display panel and the cover plate with a curved surface to generate rebound bubbles, thereby solving the technical problem that the Gaussian surface of the existing four-curved screen is prone to bubbles after bonding.

[0045] The display module and display device of the present application will be described below with reference to the accompanying drawings and specific implementations.

[0046] Please refer to Figures 2 to 7. Figure 2 is a schematic diagram of the overall structure of the display module provided in an embodiment of the present application. Figure 3 is a schematic diagram of the disassembled structure of the display module in Figure 2. Figure 4 is a schematic diagram of the planar structure of the display module in Figure 2. Figure 5 is a schematic diagram of the cross-sectional structure along the M-M' direction in Figure 4. Figure 6 is a schematic diagram of the detailed structure at point N in Figure 4. Figure 7 is a schematic diagram of the planar structure of the backplane in Figure 3. Referring to Figure 2, the display module 100 includes a planar region PD and a curved region BD located outside the planar region PD. The curved region BD surrounds the planar region PD and includes a Gaussian angle region GD located at the top corner of the display module 100. The Gaussian angle region GD is the region formed by the overlap of two adjacent curved regions BD located outside the planar region PD.

[0047] 3 , the display module 100 further includes a display panel 10 and a backplane 20 disposed on the non-light-emitting side of the display panel 10. The display panel 10 includes a flexible organic light emitting diode (OLED) display panel, etc. The flexible organic light emitting diode display panel 10 has foldable and bendable properties. The non-light-emitting side of the display panel 10 refers to the side away from the light-emitting side of the display panel 10, and the light-emitting side of the display panel 10 refers to the side of the display panel 10 that can display images. The backplane 20 is disposed on the non-light-emitting side of the display panel 10 and is used to support the display panel 10. The material of the backplane 20 includes polyethylene terephthalate (PET), etc.

[0048] Furthermore, the display module 100 also includes a protective layer 30 arranged on the light-emitting side of the display panel 10, that is, the protective layer 30 and the back plate 20 are arranged on opposite sides of the display panel 10. The protective layer 30 has high light transmittance and high hardness, for example, the protective layer 30 is a glass cover plate. The display panel 10 can be bonded to the protective layer 30 through a transparent adhesive layer 40, and the transparent adhesive layer 40 includes OCA glue or the like. Of course, optionally, the display module 100 may also include a polarizer 50 arranged on the light-emitting side of the display panel 10, and the polarizer 50 is used to reduce the surface reflectivity of the display panel 10. The polarizer 50 can be attached to the surface of the display panel 10 or directly manufactured on the surface of the display panel 10. When the display module 100 includes the polarizer 50, the polarizer 50 is bonded to the protective layer 30 through the adhesive layer 40, thereby bonding the display panel 10 to the protective layer 30.

[0049] Optionally, the display module 100 further includes a supporting functional layer 60 disposed on a side of the backplane 20 away from the display panel 10. The supporting functional layer 60 is configured to cooperate with the backplane 20 to support the display panel 10 and to dissipate heat from the display panel 10. The supporting functional layer 60 may include multiple stacked sublayers, such as a foam layer, a heat dissipation layer, and a metal layer. The foam layer may be made of foam with relatively large elastic deformation properties, the heat dissipation layer may be made of a material with excellent thermal conductivity or heat dissipation, such as graphite, and the metal layer may be made of copper foil, etc.

[0050] With reference to Figures 3, 4, and 5, the back panel 20 includes a planar portion PP corresponding to the planar area PD and a curved portion BP corresponding to the curved area BD. The curved portion BP includes a plurality of side portions SP and a corner portion JP connected between two adjacent side portions SP. The corner portion JP is provided corresponding to the Gaussian angle area GD. A first groove 201 is provided on the side of the corner portion JP facing away from the display panel 10. The first groove 201 can release the bending stress of the corner portion JP of the back panel 20 to reduce the rebound force of the corner portion JP of the back panel 20, thereby reducing the risk of rebound bubbles generated by peeling between the display panel 10 and the cover plate with a curved surface, thereby solving the problem of bubbles easily appearing on the Gaussian surface of the existing four-curved screen after bonding.

[0051] Referring to FIG4 , to facilitate differentiation of the curved area BD on the display module 100, the curved area BD is divided into a first sub-curved area BD1, a second sub-curved area BD2, and a Gaussian angle area GD located between the first sub-curved area BD1 and the second sub-curved area BD2. In FIG4 , a first dividing line FL1 represents the dividing line between the curved areas BD. The curved area BD includes two opposing first sub-curved areas BD1, two opposing second sub-curved areas BD2, and four Gaussian angle areas GD. The area of ​​each first sub-curved area BD1 is greater than the area of ​​each second sub-curved area BD2. The first groove 201 is provided at least corresponding to the Gaussian angle area GD.

[0052] 5 , the depth of the first groove 201 is less than the thickness of the back plate 20 , that is, the first groove 201 does not completely penetrate the back plate 20 , and the first groove 201 is only formed on the side of the back plate 20 away from the display panel 10 , so that the surface of the back plate 20 close to the display panel 10 is complete, that is, the back plate 20 is fully fitted with the display panel 10 , so that the back plate 20 provides effective support for the display panel 10, thereby avoiding appearance problems such as poor molding of the display panel 10 .

[0053] The width of the first groove 201 is greater than 0 microns and less than or equal to 0.5 microns, that is, the first groove 201 is a linear groove. For example, the first groove 201 is formed by a cutting process, and the cut groove with a relatively small width formed after cutting is the first groove 201. In this way, by providing the first groove 201 with a relatively small width, it is possible to avoid a significant impact on the supporting performance of the backplane 20 after providing the first groove 201 at the corner JP, thereby ensuring the overall supporting performance of the backplane 20 for the display panel 10 in the Gaussian angle region GD. The inventors of this application discovered that when the display panel 10 and the protective layer 30 are bonded together, the supporting capacity of the backplane 20 for the display panel 10 corresponding to the Gaussian angle region GD affects the wrinkling of the Gaussian angle region GD. In the Gaussian angle region GD, strengthening the supporting force of the backplane 20 for the display panel 10 can eliminate or reduce the risk of wrinkling in the Gaussian angle region GD. Therefore, the present application provides the first groove 201 with a suitable width range on the corner JP of the back plate 20, thereby eliminating or improving the rebound bubble problem and also eliminating or reducing the risk of wrinkles in the Gaussian corner area GD.

[0054] Optionally, the backplane 20 includes a first sub-backplane 21 and a second sub-backplane 22. The first sub-backplane 21 is located on a side of the second sub-backplane 22 away from the display panel 10, and the first groove 201 extends through the first sub-backplane 21. The thickness of the first sub-backplane 21 is the same as that of the second sub-backplane 22. For example, the thickness of the first sub-backplane 21 and the second sub-backplane 22 are both greater than or equal to 25 microns, and the thickness of the backplane 20 is less than or equal to 200 microns. This balances the support and rebound forces of the backplane 20. For example, the thickness of the backplane 20 is 200 microns, 195 microns, 190 microns, 185 microns, 180 microns, 170 microns, 160 microns, 150 microns, etc. If the thickness of the backplane 20 is too thin, it may not effectively support the display panel 10. If the thickness of the backplane 20 is too thick, the rebound force of the backplane 20 at the corner JP will be increased, which is not conducive to eliminating or improving the rebound bubble problem. Therefore, the thickness of the back plate 20 is set to be less than or equal to 200 microns, so as to take into account the supporting force and rebound force of the back plate 20. While eliminating or improving the rebound bubble problem, it can also eliminate or reduce the risk of wrinkles in the Gaussian angle area GD.

[0055] In another embodiment, the thickness of the first sub-backplane 21 is greater than the thickness of the second sub-backplane 22. For example, the thickness of the first sub-backplane 21 is 100 microns, and the thickness of the second sub-backplane 22 is 40 microns. In this way, while the backplane 20 as a whole provides effective support for the display panel 10, the first groove 201 with a greater depth can be provided on the first sub-backplane 21 to better relieve the bending stress of the corner JP.

[0056] Optionally, the elastic modulus of the back plate 20 is greater than or equal to 3 GPa, so that the back plate 20 can better support the display panel 10 and avoid wrinkles in the Gaussian angle region GD when the display panel 10 is attached to the protective layer 30 .

[0057] The structure of the first groove 201 will be further described in detail below.

[0058] 5 , the first groove 201 is located in the Gaussian angle region GD. In the Gaussian angle region GD, the outer boundary of the display panel 10 is flush with the outer boundary of the back plate 20, and the outer boundary of the protective layer 30 exceeds the outer boundaries of the display panel 10 and the back plate 20. The outer boundary of the protective layer 30 is the outer boundary of the display module 100, and the curved surface region BD is formed between the outer boundary of the protective layer 30 and the outer boundary of the planar region PD.

[0059] 6 , the curved area BD includes a first display area AA1 and a border area NA located on the side of the first display area AA1 away from the planar area PD. That is, the curved area BD of the display module 100 can also be used for display to increase the screen-to-body ratio. The first display area AA1 is defined by the outer boundary GB2 of the planar area PD and the outer boundary VB of the first display area AA1. The border area NA is defined by the outer boundary VB of the first display area AA1 and the outer boundary GB1 of the display module 100. The outer boundaries MB of the display panel 10 and the backplane 20 are located within the border area NA. That is, the outer boundaries MB of the display panel 10 and the backplane 20 are located between the outer boundary VB of the first display area AA1 and the outer boundary GB1 of the display module 100.

[0060] 6 and 7 , the minimum distance between the first groove 201 and the boundary of the corner JP away from the planar portion PP is greater than 0, that is, the distance between the first groove 201 and the outer boundary of the corner JP of the back plate 20 is greater than 0. In other words, in the direction from the planar portion PP to the corner JP, the first groove 201 does not penetrate the corner JP, so that in the Gaussian angle region GD, the edge area of ​​the display panel 10 is still supported by the back plate 20. The edge area of ​​the display panel 10 is an area with a large Gaussian curvature and is more prone to wrinkles. By retaining the back plate 20 corresponding to this edge area, the overall rigidity of the back plate 20 in the Gaussian angle region GD can be ensured, thereby providing effective support for the edge area of ​​the display panel 10. This can eliminate or improve the problem of rebound bubbles while also eliminating or reducing the risk of wrinkles in the Gaussian angle region GD.

[0061] Optionally, the first groove 201 is arranged corresponding to the first display area AA1, so that the first groove 201 is away from the outer boundary of the back panel 20. In this way, in the Gaussian angle area GD, the back panel 20 has a larger area of ​​the corner JP supporting the edge area of ​​the display panel 10, thereby further eliminating or reducing the risk of wrinkles in the Gaussian angle area GD.

[0062] 7 , the first groove 201 extends from the corner JP to the side SP, so that the first groove 201 is at least provided in the entire Gaussian angle region GD, thereby better eliminating or improving the rebound bubble problem. However, the extension length of the first groove 201 at the side SP should not be too large to avoid a significant impact on the supporting performance of the back plate 20 in the Gaussian angle region GD. Optionally, the extension length of the first groove 201 at the side SP is less than the extension length of the first groove 201 at the corner JP, for example, the extension length of the first groove 201 at the side SP is greater than or equal to 0 mm and less than or equal to 1 mm.

[0063] Specifically, on the first sub-backplane 21, to facilitate distinguishing the side SP from the corner JP, a second dividing line FL2 is used as the dividing line between the side SP and the corner JP in FIG7 . The side SP includes two opposing first sub-sides SP1 and two opposing second sub-sides SP2. The first sub-sides SP1 correspond to the first sub-curved surface area BD1, and the second sub-sides SP2 correspond to the second sub-curved surface area BD2. The area of ​​the first sub-sides SP1 is larger than that of the second sub-sides SP2. The corner JP connects the adjacent first sub-sides SP1 and second sub-sides SP2. The first groove 201 extends from the corner JP to the first sub-side SP1 but does not extend to the second sub-side SP2, to ensure that the second sub-side SP2 effectively supports the display panel 10. Optionally, the cross-section of the first groove 201 is arcuate, that is, the surface shape of the first groove 201 is arcuate.

[0064] Next, how to determine the position of the first groove 201 is described in detail.

[0065] Referring to Figures 8 and 9, Figure 8 is a detailed schematic diagram of the setting position of the first groove 201 provided in an embodiment of the present application, and Figure 9 is a schematic diagram of the principle of the setting of the first groove 201 provided in an embodiment of the present application. Referring to Figure 8, in the direction from the plane portion PP to the corner portion JP, the arc length of the corner portion JP is L, and the distance between the first groove 201 and the corner portion JP away from the boundary of the plane portion PP is L', wherein 1 / 3L≤L'≤2 / 3L, that is, the first groove 201 is located in the middle area of ​​the corner portion JP, and the middle area of ​​the corner portion JP is the middle where the rebound force is the largest. This area is more prone to rebound bubbles. By locating the first groove 201 in the middle area of ​​the corner portion JP, the rebound bubble problem can be better eliminated or improved. Therefore, preferably, L'=1 / 2L.

[0066] It should be noted that, in the direction from the planar portion PP toward the corner portion JP, the corner portion JP comprises multiple arcs, which are combined to form the corner portion JP. That is, in the direction from the planar portion PP toward the corner portion JP, the corner portion JP can be discretely divided into multiple arcs. On the same arc surface, one endpoint of each arc is located on the boundary between the planar portion PP and the corner portion JP, and the other endpoint is located on the boundary of the corner portion JP away from the planar portion PP. The arc length of each arc is L. The arc lengths of the multiple arcs can be equal or unequal. When the arc lengths of the multiple arcs are unequal, the arc lengths L of each arc are different. When the arc lengths of the multiple arcs are equal, the arc lengths L of each arc are the same. Correspondingly, the distance between the first groove 201 and the boundary of the corner portion JP away from the planar portion PP is the arc length between a point on the midline of the first groove 201 and a point on the boundary of the corner portion JP away from the planar portion PP on the same arc surface, where the length of L' depends on the length of L.

[0067] Referring to Figure 9, the second dividing line FL2 between the corner JP and the first sub-side SP1 and the second sub-side SP2 is extended toward the plane portion PP. Compared with point O, the two second dividing lines FL2 are connected to point O and the points on the outer boundary of the first sub-backplane 21 to form multiple first connecting lines. On each of the first connecting lines, a point P with a distance of L' from the outer boundary of the first sub-backplane 21 is found. The points P on each of the first connecting lines are connected to form a second connecting line. The first sub-backplane 21 is grooved along the second connecting line to form the first groove 201. Among them, the process of grooving the first sub-back panel 21 includes a cutting process, etc. When the cutting process is used to form the first groove 201, the second connecting line is the cutting line, and the cutting seam formed after cutting is the first groove 201, that is, the first groove 201 is a cutting groove with a relatively small groove width, which is a linear groove. A linear groove refers to a groove with a relatively small width, and the groove width is approximately the thickness of a line segment. For example, the width of the first groove 201 is greater than 0 microns and less than or equal to 0.5 microns, so as to ensure the overall supporting performance of the back panel 20 for the display panel 10 in the Gaussian angle area GD, so as to eliminate or improve the rebound bubble problem while also eliminating or reducing the risk of wrinkles in the Gaussian angle area GD.

[0068] In one embodiment, referring to Figures 2 to 10, Figure 10 is another schematic diagram of the planar structure of the display module 100 provided in an embodiment of the present application. Unlike the above embodiment, referring to Figure 10, a second groove 202 is provided on the side of the edge portion SP facing away from the display panel 10 to prevent rebound bubbles from appearing in the first sub-curved area BD1 and the second sub-curved area BD2. The second groove 202 is spaced apart from the first groove 201, that is, the second groove 202 is not connected to the first groove 201, so as to avoid a significant impact on the supporting performance of the back plate 20 in the Gaussian angle area GD.

[0069] Optionally, the depth of the second groove 202 is equal to the depth of the first groove 201; and / or the width of the second groove 202 is equal to the width of the first groove 201; and / or the distance between the second groove 202 and the edge SP of the planar portion PP is equal to the distance between the first groove 201 and the corner JP of the planar portion PP. Optionally, the cross-sectional shape of the first groove 201 is an arc, and the cross-sectional shape of the second groove 202 is a straight line.

[0070] Furthermore, it should be noted that, since the first and second sub-curved areas BD1 and BD2 within the curved area BD are less likely to produce wrinkles than the Gaussian angle area GD, the provision of the second groove 202 on the edge portion SP only needs to be sufficient to eliminate or reduce the risk of wrinkles in the first and second sub-curved areas BD1 and BD2. Therefore, the design requirements for the second groove 202 can be lower than those for the first groove 201. For example, when designing the second groove 202, the width of the second groove 202 need not be strictly controlled; the width of the second groove 202 can be greater than the width of the first groove 201. Alternatively, when designing the second groove 202, the depth of the second groove 202 and the distance between the second groove 202 and the boundary of the side portion SP away from the planar portion PP do not need to be strictly controlled. For example, the depth of the second groove 202 can be greater or less than the depth of the first groove 201. The second groove 202 only needs to be located on the side portion SP. In other words, the first groove 201 on the corner JP can be applied to the side portion SP, but the second groove 202 on the side SP does not necessarily need to be applied to the corner JP. For other explanations, please refer to the above embodiment and will not be repeated here.

[0071] In one embodiment, referring to Figures 2 to 11, Figure 11 is another structural schematic diagram of the first groove 201 provided in an embodiment of the present application. Different from the above-mentioned embodiment, referring to Figure 11, the first groove 201 includes a plurality of first sub-grooves 2011 arranged at intervals, that is, the first groove 201 is discontinuous, so as to further reduce the influence of the setting of the first groove 201 on the supporting performance of the first sub-back plate 21. In this way, while eliminating or improving the problem of rebound bubbles, the risk of wrinkles in the Gaussian angle area GD can be further eliminated or reduced. Of course, the second groove 202 also includes a plurality of second sub-grooves arranged at intervals. Please refer to the above-mentioned embodiment for other explanations, which will not be repeated here.

[0072] In one embodiment, referring to Figures 2 to 12, Figure 12 is another schematic structural diagram of the first groove 201 provided in an embodiment of the present application. Unlike the above embodiment, referring to Figure 12, the cross-sectional shape of the first groove 201 is curved. Of course, the cross-sectional shape of the second groove 202 can also be curved. In addition, regarding the cross-sectional shapes of the first groove 201 and the second groove 202, the present application is not limited thereto. The cross-sectional shapes of the first groove 201 and the second groove 202 of the present application can also be other regular or irregular shapes, such as wavy lines, broken lines, etc. For other explanations, please refer to the above embodiment and will not be repeated here.

[0073] Based on the same inventive concept, the present application further provides a display device, comprising the display module 100 of one of the aforementioned embodiments. The display device may include, but is not limited to, wearable devices such as smart bracelets, smart watches, VR (Virtual Reality), mobile phones, e-books and e-newspapers, televisions, personal laptops, and flexible OLED display devices such as foldable and rollable OLEDs.

[0074] According to the above embodiments, it can be seen that:

[0075] The present application provides a display module and a display device, wherein the display module includes a flat area and a curved area located outside the flat area; the display module also includes a display panel and a backplane arranged on the non-light-emitting side of the display panel, the backplane includes a flat portion arranged corresponding to the flat area and a curved portion arranged corresponding to the curved area, the curved portion includes a plurality of edges and a corner connected between two adjacent edges, a first groove is provided on the side of the corner facing away from the display panel, the backplane also includes a first sub-backplane and a second sub-backplane located on the side of the first sub-backplane close to the display panel, the first groove passes through the first sub-backplane, and the first groove can release the bending stress of the corner of the backplane to reduce the rebound force of the corner of the backplane, thereby reducing the risk of the display panel and the curved cover plate peeling off and generating rebound bubbles, thereby solving the technical problem that the Gaussian surface of the existing four-curved screen is prone to bubbles after bonding.

[0076] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0077] The above is a detailed introduction to the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display module, which includes a flat area and a curved area located outside the flat area; the display module further includes: A display panel; And A backplane, disposed on the non-light-emitting side of the display panel, the backplane includes a flat portion corresponding to the flat area and a curved portion corresponding to the curved area, the curved portion includes a plurality of side portions and corner portions connecting between two adjacent side portions; Wherein, the backplane further includes a first sub-backplane and a second sub-backplane located on the side of the first sub-backplane close to the display panel, a first groove is disposed on the side of the corner portion facing away from the display panel, and the first groove penetrates through the first sub-backplane.

2. The display module according to claim 1, wherein, The thicknesses of the first sub-backplane and the second sub-backplane are both greater than or equal to 25 microns, and the thickness of the backplane is less than or equal to 200 microns.

3. The display module according to claim 2, wherein, The elastic modulus of the backplane is greater than or equal to 3 GPa.

4. The display module according to claim 1, wherein, The first groove extends from the corner portion to the side portion, and the extending length of the first groove at the side portion is less than the extending length of the first groove at the corner portion.

5. The display module according to claim 4, wherein, The extending length of the first groove at the side portion is greater than or equal to 0 mm and less than or equal to 1 mm.

6. The display module according to claim 1, wherein, The width of the first groove is greater than 0 microns and less than or equal to 0.5 microns.

7. The display module according to claim 1, wherein, The minimum distance between the first groove and the boundary of the corner portion away from the flat portion is greater than 0.

8. The display module according to claim 7, wherein, In the direction from the flat portion to the corner portion, the arc length of the corner portion is L, and the distance between the first groove and the boundary of the corner portion away from the flat portion is L', wherein, 1 / 3L ≤ L' ≤ 2 / 3L.

9. The display module according to claim 8, wherein, L' = 1 / 2L.

10. The display module according to claim 7, wherein, The curved area includes a first display area and a border area located on the side of the first display area away from the flat area, and the first groove is disposed corresponding to the first display area.

11. The display module according to claim 7, wherein, A second groove is disposed on the side of the side portion facing away from the display panel, and the second groove is spaced from the first groove.

12. The display module according to claim 11, wherein, The cross-sectional shape of the first groove includes at least one of an arc shape and a curve shape; and / or, the cross-sectional shape of the second groove includes at least one of a straight line shape and a curve shape.

13. The display module according to claim 11, wherein, The first groove includes a plurality of first sub-grooves disposed at intervals; and / or, the second groove includes a plurality of second sub-grooves disposed at intervals.

14. The display module according to claim 1, wherein, The display module further includes a protective layer and a support function layer, the protective layer is disposed on the side of the display panel facing away from the backplane, and the support function layer is disposed on the side of the backplane facing away from the display panel.

15. A display device, which includes a display module, and the display module includes a flat area and a curved area located outside the flat area; The display module further includes: A display panel; and A backplane, disposed on the non-light-emitting side of the display panel, the backplane includes a flat portion corresponding to the flat area and a curved portion corresponding to the curved area, the curved portion includes a plurality of side portions and corner portions connecting between two adjacent side portions; Wherein, the backplane further includes a first sub-backplane and a second sub-backplane located on the side of the first sub-backplane close to the display panel, a first groove is disposed on the side of the corner portion facing away from the display panel, and the first groove penetrates through the first sub-backplane.

16. The display device according to claim 15, wherein, The first groove extends from the corner to the side, and the extension length of the first groove at the side is less than the extension length of the first groove at the corner.

17. The display device according to claim 15, wherein, The width of the first groove is greater than 0 micrometers and less than or equal to 0.5 micrometers.

18. The display device according to claim 15, wherein, The minimum distance between the first groove and the boundary of the corner away from the planar portion is greater than 0.

19. The display device according to claim 18, wherein, In the direction from the planar portion to the corner, the arc length of the corner is L, and the distance between the first groove and the boundary of the corner away from the planar portion is L', where 1 / 3L ≤ L' ≤ 2 / 3L.

20. The display device according to claim 18, wherein The curved surface area includes a first display area and a border area located on the side of the first display area away from the planar area, and the first groove is provided corresponding to the first display area.

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