Display module and display device

Abstract

The present application provides a display module and a display device. The display module comprises a display panel, a first protective layer, a light shielding layer, and a first bonding layer; the first bonding layer is disposed between the first protective layer and the display panel and extends from a display region of the display module to a bezel region thereof; the first bonding layer overlaps and is in contact with at least part of the light shielding layer; and the first bonding layer overlapping the light shielding layer also overlaps at least part of a bending portion of the display panel.

Description

Display module and display device TECHNICAL FIELD

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

[0002] An organic light emitting diode (OLED) display panel has the characteristics of self-illumination, wide viewing angle, short response time, high luminous efficiency, wide color gamut, low working voltage, flexibility, etc., and is considered to be the most potential new display panel. Among them, the flexibility of the OLED display panel can realize a display device with a fixed curved surface and a foldable display device. In addition, the flexible OLED display panel can be fixed by reversing the fan-out wiring, the binding area, the flexible printed circuit board (FPC) structure to the back side of the display screen body through the pad bending process, so as to reduce the frame size of the flexible OLED display device and realize high screen ratio.

[0003] However, with the reduction of the frame size of the flexible OLED display device, bubbles appear at the edge of the display area of the flexible OLED display device, which seriously affects the quality of the flexible OLED display device. SUMMARY

[0004] The present application provides a display module and a display device to alleviate the technical problem of bubbles existing at the edge of the display area of the flexible OLED display device.

[0005] The technical solutions provided by the present application are as follows:

[0006] In a first aspect, the present application provides a display module, which comprises a display area and a frame area located outside the display area; the display module further comprises:

[0007] a display panel having opposite light-emitting side and non-light-emitting side, the display panel comprising a first planar portion, a second planar portion and a bending portion connected between the first planar portion and the second planar portion, the second planar portion being bent to the non-light-emitting side of the first planar portion through the bending portion, the bending portion being located in the frame area;

[0008] a first protective layer arranged on the light-emitting side of the display panel;

[0009] a light-shielding layer arranged on the side of the first protective layer close to the display panel, the light-shielding layer being located in the frame area;

[0010] A first adhesive layer is arranged between the first protective layer and the display panel, the first adhesive layer is located in the display area and extends from the display area into the frame area, the first adhesive layer overlaps and contacts at least part of the light shielding layer.

[0011] The first adhesive layer overlapping the light shielding layer also overlaps at least part of the bending portion.

[0012] In a second aspect, the embodiments of the present application further provide a display device comprising the display module of the foregoing embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0014] FIG. 1 is a partial cross-sectional structure schematic diagram of a display module provided by a prelude part of the embodiments of the present application.

[0015] FIG. 2 is a first cross-sectional structure schematic diagram of a display module provided by the embodiments of the present application.

[0016] FIG. 3 is a second cross-sectional structure schematic diagram of a display module provided by the embodiments of the present application.

[0017] FIG. 4 is a third cross-sectional structure schematic diagram of a display module provided by the embodiments of the present application.

[0018] FIG. 5 is a fourth cross-sectional structure schematic diagram of a display module provided by the embodiments of the present application.

[0019] FIG. 6 is a local stress simulation data diagram of the display module in FIG. 5.

[0020] FIG. 7 is a fifth cross-sectional structure schematic diagram of a display module provided by the embodiments of the present application.

[0021] FIG. 8 is a sixth cross-sectional structure schematic diagram of a display module provided by the embodiments of the present application.

[0022] FIG. 9 is a local top view schematic diagram of the second adhesive layer in FIG. 8. Embodiments of the present application

[0023] The following description of the embodiments refers to the accompanying drawings, which are meant to exemplify particular embodiments of the application. The orientation of the description and the drawings is merely meant to exemplify the application and is not meant to limit the application. In the drawings, like reference numerals refer to like elements. In the drawings, the thicknesses of some layers and regions are exaggerated for clarity 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 thereto.

[0024] In view of the problem of bubbles existing at the edge of the display area of the flexible OLED display device, the inventors of the present application found in research that, referring to FIG. 1, the display module includes a display panel 10', a first protective layer 21', a light shielding layer 22', a first adhesive layer 23', a polarizer 30', and a first adhesive layer 40'. The bubbles 500' existing at the edge of the display area are mainly concentrated at the step formed by the light shielding layer 22' and the first protective layer 21'. The inventors further analyzed the reason for the bubbles formed at this position. Specifically, the first protective layer 21' is attached to the polarizer 30' through the first adhesive layer 23', and the polarizer 30' is attached to the display panel 10'. The display panel 10' includes a first planar portion 11', a second planar portion 12', and a bending portion 13'. The display panel 10' is a flexible display panel, so that the second planar portion 12' can be bent to the back of the display panel 10' through the bending portion 13' to reduce the frame. The first adhesive layer 40' covers the surface of the bending portion 13' to protect the circuit in the bending portion 13'. The first adhesive layer 40' can be UV adhesive or the like. For the display device with folding function, during folding, the film layer above the display panel 10' will be displaced. In order to avoid film layer adhesion caused by the displacement of the film layer and the interference with the first adhesive layer 40', a reserved gap needs to be provided between the film layer above the display panel 10' and the first adhesive layer 40', such as the polarizer 30' and the first adhesive layer 23' both being provided with a reserved gap in the horizontal direction with the first adhesive layer 40'. However, the existence of the reserved gap is not conducive to the reduction of the frame size, and in order to further reduce the size of the frame, the size of the reserved gap needs to be reduced. Therefore, the coverage length of the first adhesive layer 23' can be reduced, so that the first adhesive layer 23' is retracted into the polarizer 30'.

[0025] However, the inward shrinkage of the first adhesive layer 23' can cause the first adhesive layer 23' to not well cover the step difference between the light shielding layer 22' and the first protective layer 21', so that the first adhesive layer 23' cannot effectively fill the step difference between the light shielding layer 22' and the first protective layer 21', and further cause the first adhesive layer 23' to form a bubble 500' at the step difference position, and the existence of the bubble 500' seriously affects the quality of the product. Moreover, the first adhesive layer 23' can even shrink inward to the inner circle of the light shielding layer 22', that is, there is no overlapping part between the first adhesive layer 23' and the light shielding layer 22', at this time, when the front display device is viewed, the film layer boundary of the first adhesive layer 23' can be seen, causing the edge leakage.

[0026] To this end, the present application provides a display module and a display device.

[0027] In an embodiment, the present application provides a display module, comprising a display area and a frame area located outside the display area; the display module further comprises:

[0028] a display panel having opposite light-emitting and non-light-emitting sides, the display panel comprising a first planar portion, a second planar portion, and a bending portion connected between the first planar portion and the second planar portion, the second planar portion being bent to the non-light-emitting side of the first planar portion through the bending portion, the bending portion being located in the frame area;

[0029] a first protective layer disposed on the light-emitting side of the display panel;

[0030] a light shielding layer disposed on the side of the first protective layer close to the display panel, the light shielding layer being located in the frame area;

[0031] a first adhesive layer disposed between the first protective layer and the display panel, the first adhesive layer being located in the display area and extending from the display area into the frame area, the first adhesive layer overlapping and contacting at least part of the light shielding layer;

[0032] wherein the first adhesive layer overlapping the light shielding layer also overlaps at least part of the bending portion.

[0033] In an embodiment, the display module further comprises:

[0034] a first adhesive layer disposed between the first protective layer and the display panel, the first adhesive layer being located in the display area and extending from the display area into the frame area, the first adhesive layer overlapping and contacting at least part of the light shielding layer;

[0035] a first adhesive layer disposed between the first protective layer and the display panel, the first adhesive layer being located in the display area and extending from the display area into the frame area, the first adhesive layer overlapping and contacting at least part of the light shielding layer;

[0036] In an embodiment, the first isolation layer has an elastic modulus less than an elastic modulus of the first adhesive layer.

[0037] In an embodiment, the display module further comprises:

[0038] a second protective layer disposed on a side of the first protective layer close to the display panel, the first adhesive layer being located between the second protective layer and the first protective layer;

[0039] a second adhesive layer disposed on a side of the second protective layer close to the display panel, the second adhesive layer being located in the display area and extending from the display area into the frame area;

[0040] wherein the second adhesive layer overlaps at least part of the light-shielding layer, and the second adhesive layer overlapping the light-shielding layer further overlaps at least part of the bending portion.

[0041] In an embodiment, a width of the first adhesive layer overlapping the light-shielding layer is greater than a width of the second adhesive layer overlapping the light-shielding layer.

[0042] In an embodiment, the display module further comprises:

[0043] a first adhesive layer, the first adhesive layer covering at least the bending portion;

[0044] a second isolation layer, the second isolation layer being disposed on a side of the first adhesive layer away from the bending portion, a surface adhesion of the second isolation layer on the side away from the first adhesive layer being less than a surface adhesion of the first adhesive layer.

[0045] In an embodiment, the second isolation layer has an elastic modulus less than an elastic modulus of the first adhesive layer.

[0046] In an embodiment, the second adhesive layer extends from the display area into the frame area, and the second adhesive layer extending into the frame area covers at least the bending portion.

[0047] In an embodiment, the display module further comprises a color film layer, the color film layer being disposed on a light-emitting side of the display panel, the second adhesive layer covering the color film layer and extending from the color film layer to the bending portion.

[0048] In an embodiment, the display module further comprises a third isolation layer, the third isolation layer being disposed on a side of the second adhesive layer away from the bending portion; wherein a surface adhesion of the third isolation layer on the side away from the second adhesive layer is less than a surface adhesion of the second adhesive layer.

[0049] In an embodiment, the third isolation layer has an elastic modulus less than that of the second adhesive layer.

[0050] In an embodiment, the first planar portion includes a first sub-portion close to the bending portion, the first sub-portion being located in the frame area, the second adhesive layer further covering the first sub-portion, and the third isolation layer further being disposed on a side of the second adhesive layer away from the first sub-portion; wherein the third isolation layer overlapping the first sub-portion is provided with a first hollow structure.

[0051] In an embodiment, a surface tackiness of the second adhesive layer covering the bending portion is less than a surface tackiness of the second adhesive layer between the second protective layer and the display panel.

[0052] In an embodiment, the first planar portion includes a first sub-portion close to the bending portion, the first sub-portion being located in the frame area, the second adhesive layer further covering the first sub-portion; wherein the second adhesive layer covering the first sub-portion is provided with a second hollow structure.

[0053] In an embodiment, an outer boundary of the second protective layer is flush with an outer boundary of the first protective layer.

[0054] In an embodiment, a projection of the display panel on a first plane is located within a projection of the first protective layer on the first plane, and the projection area of the first protective layer is greater than that of the display panel; wherein the first plane is parallel to a light-outgoing side surface of the display panel.

[0055] In an embodiment, an outer boundary of the first adhesive layer is flush with an outer boundary of the first protective layer.

[0056] In an embodiment, the present application further provides a display device including the display module of any one of the foregoing embodiments.

[0057] The display module and the display device provided in the application, the display module comprises a display area and a frame area outside the display area; the display module further comprises a display panel, a first protective layer, a light shielding layer and a first adhesive layer, the first protective layer is arranged on the light emitting side of the display panel; the light shielding layer is arranged on the side of the first protective layer close to the display panel, the light shielding layer is located in the frame area, the first adhesive layer is arranged between the first protective layer and the display panel, the first adhesive layer is located in the display area and extends from the display area to the frame area, the first adhesive layer overlaps and contacts at least part of the light shielding layer, and the first adhesive layer overlapping the light shielding layer also overlaps at least part of the bending part of the display panel, so as to increase the overlapping area of the first adhesive layer and the light shielding layer, enable the first adhesive layer to fill the gap between the light shielding layer and the first protective layer, reduce the risk of forming bubbles in the first adhesive layer at the gap position, and thus improve the problem of bubbles existing in the edge of the display area of the flexible OLED display device.

[0058] The display module and the display device provided in the application will be described in detail below in combination with the drawings and specific embodiments.

[0059] Please refer to FIG. 1 and FIG. 2, FIG. 2 is the first cross-sectional structure schematic diagram of the display module provided in the embodiment of the application. Referring to FIG. 2, the display module 100 comprises a display area AA and a frame area BA outside the display area AA, the display area AA is used for displaying pictures, and the frame area BA is used for arranging binding structures, peripheral circuits and the like. Specifically, the display panel 10 comprises a flexible organic light emitting diode (OLED) display panel 10 and the like, and the display panel 10 can comprise a substrate and a driving circuit layer, a light emitting functional layer and an encapsulation layer which are sequentially arranged on the substrate. The driving circuit layer is provided with a driving circuit, the light emitting functional layer is provided with a light emitting device, the driving circuit is used for driving the light emitting device to emit light, and the encapsulation layer is used for protecting the light emitting device and avoiding water and oxygen from invading to cause the light emitting device to fail. The flexible organic light emitting diode display panel 10 has the characteristic of flexibility, so that the display panel 10 can realize bending or folding.

[0060] The display panel 10 comprises a first planar portion 11, a second planar portion 12, and a bending portion 13 connected between the first planar portion 11 and the second planar portion 12, the second planar portion 12 is bent to the side of the first planar portion 11 away from the first protective layer 21 through the bending portion 13, at least part of the bending portion 13 is located in the frame area BA, and the first planar portion 11 is at least located in the display area AA. The second planar portion 12 and the bending portion 13 are provided with binding lines, by bending the second planar portion 12 to the non-light-emitting side of the display panel 10, the external circuit can be bound with the binding lines on the second planar portion 12 on the non-light-emitting side of the display panel 10, so as to reduce the area of the frame area BA occupied by binding the external circuit.

[0061] The display module 100 further comprises a display panel 10, a first protective layer 21, a light shielding layer 22, and a first adhesive layer 23. The display panel 10 has opposite light-emitting and non-light-emitting sides, the light-emitting side is the side of the display panel 10 displaying a picture, and the non-light-emitting side is the side of the display panel 10 away from the light-emitting side. The first protective layer 21 is arranged on the light-emitting side of the display panel 10, and the first protective layer 21 is located in the display area AA and extends from the display area AA into the frame area BA. The light shielding layer 22 is arranged on the side of the first protective layer 21 close to the display panel 10, and the light shielding layer 22 is located in the frame area BA. The first adhesive layer 23 is arranged between the first protective layer 21 and the display panel 10, and the first adhesive layer 23 is located in the display area AA and extends from the display area AA into the frame area BA, and the first adhesive layer 23 overlaps and contacts at least part of the light shielding layer 22. Moreover, the first adhesive layer 23 overlapping the light shielding layer 22 also overlaps at least part of the bending portion 13. In this application, the overlapping of two structures means that the orthographic projections of the two structures on a specific plane have overlapping parts, for example, the first adhesive layer 23 overlapping the light shielding layer 22 also overlaps at least part of the bending portion 13 means that the orthographic projection of the first adhesive layer 23 on a specific plane overlaps at least part of the orthographic projection of the bending portion 13 on the specific plane, and the specific plane is parallel to the light-emitting side surface of the display panel 10.

[0062] In the embodiment, the first adhesive layer 23 extends from the display area AA to the frame area BA, and overlaps and contacts at least part of the light shielding layer 22. The first adhesive layer 23 overlapping the light shielding layer 22 also overlaps at least part of the bending portion 13. The overlapping area of the first adhesive layer 23 and the light shielding layer 22 is increased, so that the first adhesive layer 23 can fill the gap between the light shielding layer 22 and the first protective layer 21, and the risk of forming bubbles in the first adhesive layer 23 at the gap is reduced, thereby improving the problem of bubbles existing at the edge of the display area AA of the flexible OLED display device. Moreover, the overlapping area of the first adhesive layer 23 and the light shielding layer 22 is increased, so that the problem of the first adhesive layer 23 shrinking inwardly of the inner circle of the light shielding layer 22 and causing edge leakage is avoided.

[0063] Optionally, in order to protect the binding line on the bending portion 13, the display module 100 further comprises a first adhesive layer 40, and the first adhesive layer 40 at least covers the bending portion 13. Of course, in order to better protect the binding line, the first adhesive layer 40 can also extend from the bending portion 13 to part of the first planar portion 11 and part of the second planar portion 12. For example, the first planar portion 11 comprises a first sub-portion 111 close to the bending portion 13, the first sub-portion 111 is located in the frame area BA, and the first adhesive layer 40 also covers part of the first sub-portion 111. The material of the third protective portion comprises UV glue and the like.

[0064] In an embodiment, the display module 100 further comprises a first isolation layer 60, and the first isolation layer 60 is arranged on the side of the first adhesive layer 40 away from the bending portion 13. The surface adhesion of the side of the first isolation layer 60 away from the first adhesive layer 40 is less than the surface adhesion of the first adhesive layer 40. The elastic modulus of the first isolation layer 60 is less than the elastic modulus of the first adhesive layer 40, so as to avoid affecting the bending performance of the bending portion 13 when the first isolation layer 60 is arranged on the first adhesive layer 40. The first isolation layer 60 covers the surface of the side of the first adhesive layer 40 away from the bending portion 13. Optionally, the first isolation layer 60 at least covers the area where the first adhesive layer 40 overlaps with the first protective layer 21, so as to isolate the first adhesive layer 40 and the first protective layer 21, and avoid the first adhesive layer 40 and the first protective layer 21 from being adhered. The thickness of the first isolation layer 60 is less than the interval distance between the first adhesive layer 40 and the first protective layer 21. The first isolation layer 60 can be a single-sided adhesive tape, a weak adhesion film, or a non-adhesive coating, etc.

[0065] Optionally, in order to support the display panel 10 and fix the second planar part 12 bent to the non-light-emitting side of the display panel 10, the display module 100 further comprises a back plate 51, a buffer layer 52, an auxiliary support layer 53, a third adhesive layer 54, and the like. The back plate 51 is arranged on the non-light-emitting side of the display panel 10 and adheres to the display panel 10. The back plate 51 is disconnected at a position corresponding to the bending part 13, so that the back plate 51 is arranged in two sections. That is, the back plate 51 comprises a first sub-back plate 511 and a second sub-back plate 512, the first sub-back plate 511 is arranged corresponding to the first planar part 11, and the second sub-back plate 512 is arranged corresponding to the second planar part 12. The material of the back plate 51 comprises polyethylene terephthalate (PET) and the like.

[0066] The buffer layer 52 is arranged on the side of the first sub-back plate 511 away from the first planar part 11, and the material of the buffer layer 52 comprises polyimide (PI) and the like. The auxiliary support layer 53 is arranged on the side of the buffer layer 52 away from the first sub-back plate 511, and the material of the auxiliary support layer 53 comprises stainless steel (such as SUS) and the like. The auxiliary support layer 53 designed with stainless steel can make the display panel 10 meet the demand of dynamic bending, and the stainless steel can ensure the bending shape of the display panel 10 during dynamic bending. The third adhesive layer 54 is arranged between the auxiliary support layer 53 and the second sub-back plate 512, and the second sub-back plate 512 is fixed to the auxiliary support layer 53 through the third adhesive layer 54. The third adhesive layer 54 can be double-sided tape and the like.

[0067] Optionally, when the display module 100 is applied to a folding display device, the auxiliary support layer 53 is provided with a stress release area 530 at a position corresponding to the folding area. The auxiliary support layer 53 is provided with a hollow structure at the stress release area 530 to release the stress generated during folding. In order to avoid dust, foreign particles and the like from entering the display module 100 through the hollow structure on the auxiliary support layer 53, the display module 100 further comprises a fourth protective layer 55, which is arranged on the side of the auxiliary support layer 53 away from the buffer layer 52 and corresponds to the stress release area 530. The fourth protective layer 55 can also structure the auxiliary support layer 53 of the stress release area 530. The fourth protective layer 55 can be single-sided tape and the like.

[0068] Optionally, the display module 100 further comprises a polarizer 30 disposed on the light-out side of the display panel 10, the polarizer 30 is used to reduce the reflectivity of the display module 100. The polarizer 30 is disposed corresponding to the first planar portion 11. Optionally, the polarizer 30 is located within the display area AA and extends from the display area AA into the frame area BA. A reserved gap is disposed between the polarizer 30 and the first adhesive layer 40, so that the display module 100 of the present application can be applied in a folding display device.

[0069] The first protective layer 21 is disposed on the side of the polarizer 30 away from the display panel 10, and the first adhesive layer 23 is disposed on the side of the first protective layer 21 close to the polarizer 30. The first protective layer 21 is used to protect the display panel 10 and the polarizer 30. The first protective layer 21 can be formed by a layer of polyimide, polyethylene terephthalate, ultra-thin glass (UTG), etc. The material of the first adhesive layer 23 includes transparent optical adhesive, such as OCA, etc.

[0070] The first protective layer 21 and the first adhesive layer 23 are both located within the display area AA and extend from the display area AA into the frame area BA. The light-shielding layer 22 is disposed on the side of the first protective layer 21 close to the polarizer 30 and is located within the frame area BA. The outer boundary 220 of the light-shielding layer 22 is flush with the outer boundary 210 of the first protective layer 21. The material of the light-shielding layer 22 includes light-shielding ink, etc., and the light-shielding layer 22 is used to shield light in the frame area BA to avoid the structure in the frame area BA from being exposed.

[0071] The first adhesive layer 23 extending into the frame area BA overlaps and contacts the light-shielding layer 22, and the first adhesive layer 23 overlapping the light-shielding layer 22 also overlaps at least part of the bending portion 13 to increase the overlapping area of the first adhesive layer 23 and the light-shielding layer 22. For example, in the direction in which the display area AA points to the frame area BA, the width of the first adhesive layer 23 overlapping the light-shielding layer 22 is greater than or equal to 0.2 millimeters, such as 0.21 millimeters, 0.22 millimeters, 0.23 millimeters, 0.25 millimeters, 0.28 millimeters, 0.3 millimeters, 0.35 millimeters, 0.4 millimeters, 0.5 millimeters, 0.6 millimeters, 0.7 millimeters, etc.

[0072] Thus, by increasing the overlapping area of the first adhesive layer 23 and the light shielding layer 22, the first adhesive layer 23 has sufficient coverage on the light shielding layer 22, and the first adhesive layer 23 can fill the gap between the light shielding layer 22 and the first protective layer 21, reduce the risk of forming bubbles in the first adhesive layer 23 at the gap position, and improve the problem of bubbles existing at the edge of the display area AA of the flexible OLED display device.

[0073] In an embodiment, the orthographic projection of the display panel 10 on a first plane is located within the orthographic projection of the first protective layer 21 on the first plane, and the orthographic projection area of the first protective layer 21 is greater than the orthographic projection area of the display panel 10; wherein the first plane is parallel to the light-outgoing side surface of the display panel 10, that is, the first plane is the specific plane described above. In other words, in the viewing angle of the display module 100, the first protective layer 21 overlaps the display panel 10, and the outer boundary 210 of the first protective layer 21 exceeds the outer boundary 120 of the display panel 10, that is, the first protective layer 21 extends a large length to the frame area BA, so that the first protective layer 21 can directly contact and fix with the middle frame of the display module 100, and the first protective layer 21 can replace the front frame of the display module 100, and improve the flatness of the surface of the display module 100.

[0074] In an embodiment, the outer boundary 230 of the first adhesive layer 23 is flush with the outer boundary 210 of the first protective layer 21, to further increase the overlapping area of the first adhesive layer 23 and the light shielding layer 22, so as to further reduce the risk of forming bubbles in the first adhesive layer 23 at the gap position, and further improve the problem of bubbles existing at the edge of the display area AA of the flexible OLED display device.

[0075] In an embodiment, referring to FIGS. 1-3, FIG. 3 is a schematic view of a second cross-sectional structure of the display module. Different from the above embodiment, referring to FIG. 3, the display module 100 further includes a second protective layer 24 and a second adhesive layer 25. The second protective layer 24 is disposed on a side of the first protective layer 21 close to the display panel 10, the first adhesive layer 23 is located between the second protective layer 24 and the first protective layer 21, and the first protective layer 21 is attached to the second protective layer 24 through the first adhesive layer 23. The second adhesive layer 25 is disposed on a side of the second protective layer 24 close to the display panel 10, the second adhesive layer 25 is located in the display area AA and extends from the display area AA to the frame area BA. The second protective layer 24 is attached to the polarizer 30 through the second adhesive layer 25. The second protective layer 24 and the second adhesive layer 25 are both provided with a reserved gap between the first adhesive layer 40. In a viewing angle of the display module 100, the second adhesive layer 25 overlaps at least part of the light shielding layer 22 to avoid edge leakage of the second adhesive layer 25. Optionally, the second adhesive layer 25 overlapping the light shielding layer 22 also overlaps at least part of the bending portion 13, and the width of the first adhesive layer 23 overlapping the light shielding layer 22 is greater than the width of the second adhesive layer 25 overlapping the light shielding layer 22.

[0076] Optionally, the second protective layer 24 can be formed by a layer of polyimide, polyethylene terephthalate, ultra-thin glass (UTG), etc. The second protective layer 24 is different from the first protective layer 21, for example, the first protective layer 21 is a layer of polyimide, and the second protective layer 24 is a layer of polyethylene terephthalate or ultra-thin glass. The material of the second adhesive layer 25 can be the same as that of the first adhesive layer 23, for example, both are transparent optical adhesive such as OCA, etc. For other descriptions, please refer to the above embodiment, which will not be repeated here.

[0077] In an embodiment, referring to FIGS. 1-4, FIG. 4 is a schematic view of a third cross-sectional structure of the display module 100. Referring to FIG. 4, different from the above embodiment, the outer boundary of the second protective layer 24 is flush with the outer boundary 210 of the first protective layer 21, that is, the second protective layer 24 also extends a large length to the frame area BA, and combines with the first protective layer 21 to replace the front frame. The second protective layer 24 can reinforce the structure of the first protective layer 21 and improve the structural stability of the first protective layer 21 for replacing the front frame. For other descriptions, please refer to the above embodiment, which will not be repeated here.

[0078] In an embodiment, referring to FIGS. 1-6, FIG. 5 is a fourth cross-sectional structure schematic diagram of a display module 100 provided by an embodiment of the present application, and FIG. 6 is a partial stress simulation data diagram of the display module 100 in FIG. 5. Referring to FIG. 5, different from the above-mentioned embodiments, the display module 100 further includes a second isolation layer 61, which is arranged on a side of the first adhesive layer 40 away from the bending part 13, and a surface of the second isolation layer 61 away from the first adhesive layer 40 has a surface adhesion smaller than that of the first adhesive layer 40.

[0079] Specifically, the second isolation layer 61 covers the surface of the first adhesive layer 40 away from the bending part 13, and optionally, the second isolation layer 61 covers at least the region where the first adhesive layer 40 overlaps with the second protective layer 24, so as to isolate the first adhesive layer 40 from the second protective layer 24 and avoid the first adhesive layer 40 from being bonded to the second protective layer 24. The thickness of the second isolation layer 61 is smaller than the interval distance between the first adhesive layer 40 and the second protective layer 24. The second isolation layer 61 can be a single-sided adhesive tape, a weak adhesion film, or a non-adhesive coating, etc.

[0080] It should be noted that the scheme of arranging the second isolation layer 61 on the surface of the first adhesive layer 40 is obtained by the inventors of the present application through in-depth research. Because the first adhesive layer 40 covering the bending part 13 plays a crucial role in the bending stress on the bending part 13, modifying the structure of the first adhesive layer 40 is likely to affect the bending stress on the bending part 13. In order not to affect the bending stress on the bending part 13, the second isolation layer 61 is usually arranged on a film layer close to the first adhesive layer 40, such as on the surface of the second protective layer 24 facing the first adhesive layer 40. However, the inventors of the present application break through the conventional thinking and arrange the second isolation layer 61 on the surface of the first adhesive layer 40 to solve the problem of avoiding the first adhesive layer 40 from being bonded to the second protective layer 24, and through simulation simulation, it is found that: by arranging the second isolation layer 61 on the first adhesive layer 40, not only does it not affect the bending stress on the bending part 13, but it also reduces the bending stress on the bending part 13 to a certain extent, thereby reducing the local stress of the display panel 10.

[0081] Specifically, referring to FIG. 6, the columnar in the leftmost area of FIG. 6 is the local stress data on the bending part 13 of the display panel 10 when the second isolation layer 61 is not arranged on the first adhesive layer 40; the three columnars in the middle area of FIG. 6 are the local stress data on the bending part 13 of the display panel 10 when the second isolation layer 61 with a thickness of 10 microns is arranged on the first adhesive layer 40, wherein 500, 1000, 1500 in the figure refer to the elastic modulus of the second isolation layer 61, and the unit is Mpa; the three columnars in the rightmost area of FIG. 6 are the local stress data on the bending part 13 of the display panel 10 when the second isolation layer 61 with a thickness of 30 microns is arranged on the first adhesive layer 40, wherein 500, 1000, 1500 in the figure refer to the elastic modulus of the second isolation layer 61, and the unit is Mpa. As can be seen from FIG. 6, by arranging the second isolation layer 61 with a certain thickness on the first adhesive layer 40, the elastic modulus of the second isolation layer 61 is smaller than that of the first adhesive layer 40, which can reduce the local stress on the bending part 13 of the display panel 10, and the local stress on the bending part 13 of the display panel 10 is reduced by about 0.8%; moreover, as the thickness and elastic modulus of the second isolation layer 61 increase, the stress reduction effect is better, but the thickness of the second isolation layer 61 should be smaller than the gap between the first adhesive layer 40 and the film layer above it to avoid interference between the second isolation layer 61 and the film layer above the first adhesive layer 40, for example, the thickness of the second isolation layer 61 is controlled to be less than 0.1 millimeter, which can not only avoid the adhesion between the first adhesive layer 40 and the second protective layer 24, but also avoid the interference between the second isolation layer 61 and the second protective layer 24. For other descriptions, please refer to the above embodiments, which will not be described here.

[0082] In an embodiment, referring to FIGS. 1 to 7, FIG. 7 is a fifth cross-sectional structure schematic diagram of a display module 100 provided by the embodiment of the present application. Referring to FIG. 7, different from the above embodiments, the second bonding layer 25 extends from the display area AA to the frame area BA and covers at least the bending part 13 to replace the first adhesive layer 40.

[0083] Specifically, the display module 100 further comprises a color film layer 31, the color film layer 31 is arranged on the light-out side of the display panel 10, the second bonding layer 25 covers the color film layer 31 and extends to the bending part 13. The color film layer 31 is at least located in the display area AA, and optionally, the color film layer 31 further extends from the display area AA to the frame area BA. The color film layer 31 can comprise a patterned black matrix (BM) and red color resist, blue color resist and green color resist arranged in the openings of the patterned black matrix. By using the color film layer 31 to replace the polarizer 30, the thickness of the display module 100 can be thinned, and the light-out rate of the display panel 10 can be improved, thereby reducing energy consumption.

[0084] The second bonding layer 25 covers the color film layer 31 and extends to the bending part 13 to replace the first adhesive layer 40, so that the reserved gap between the first adhesive layer 40 and the polarizer 30 and the second protective layer 24 can be eliminated, the width of the frame area BA of the display module 100 is reduced, for example, the width of the frame area BA of the display module 100 can be reduced by at least 0.3 mm or more, so as to realize a narrower frame. The second bonding layer 25 also covers part of the first planar part 11 and part of the second planar part 12. When the display module 100 is applied to a folding display device, the second bonding layer 25 can use foldable OCA adhesive. Other descriptions can refer to the above embodiments, which will not be repeated here.

[0085] In an embodiment, please refer to FIGS. 1-9, FIG. 8 is a sixth cross-sectional structure schematic diagram of the display module 100 provided by the embodiment of the present application, and FIG. 9 is a partial top view schematic diagram of the second bonding layer 25 in FIG. 8. Referring to FIG. 8, different from the above embodiments, the display module 100 further comprises a third isolation layer 62, the third isolation layer 62 is arranged on the side of the second bonding layer 25 away from the bending part 13; wherein the surface adhesion of the third isolation layer 62 away from the second bonding layer 25 is less than the surface adhesion of the second bonding layer 25.

[0086] Specifically, the third isolation layer 62 covers the surface of the second bonding layer 25 away from the bending part 13. Optionally, the third isolation layer 62 covers at least the region of the second bonding layer 25 overlapping with the first bonding layer 23 in the bezel area BA, so as to isolate the second bonding layer 25 from the first bonding layer 23 and avoid the second bonding layer 25 from adhering to the first bonding layer 23. The thickness of the third isolation layer 62 is smaller than the spacing distance between the second bonding layer 25 and the first bonding layer 23. The elastic modulus of the third isolation layer 62 is smaller than the elastic modulus of the second bonding layer 25, so as to avoid affecting the bending performance of the bending part 13 when the third isolation layer 62 is arranged on the second bonding layer 25. The third isolation layer 62 can be an insulating tape, a single-sided tape, a weakly adhesive film or a non-adhesive coating, etc.

[0087] In another embodiment, the second bonding layer 25 located in the bezel area BA and covering the bending part 13 can also be light-cured or semi-cured, so as to reduce the adhesion of the second bonding layer 25 covering the bending part 13, so that the surface adhesion of the second bonding layer 25 covering the bending part 13 is smaller than the surface adhesion of the second bonding layer 25 between the second protection layer 24 and the display panel 10, thereby eliminating the need to additionally arrange the third isolation layer 62.

[0088] Optionally, referring to FIG. 9, the first planar part 11 includes a first sub-part 111 close to the bending part 13, the first sub-part 111 is located in the bezel area BA, and the second bonding layer 25 also covers the first sub-part 111. The second bonding layer 25 covering the first sub-part 111 is provided with a second hollow structure 250, so as to release the stress of the first sub-part 111 when the bending part 13 is bent. The shape of the hollow structure 250 can be regular or irregular patterns such as ellipse, circle, square, diamond, rectangle, etc. The arrangement of the hollow structure can be arranged in a relative or staggered manner in the column direction or the row direction. In the direction in which the display area AA points to the bezel area BA, the arrangement density of the second hollow structure 250 gradually increases. In some other embodiments, the second hollow structure 250 can also be arranged on the second bonding layer 25 corresponding to the bending part 13.

[0089] In some other embodiments, the first planar portion 11 includes a first sub-portion 111 close to the bending portion 13, the first sub-portion 111 is located in the bezel area BA, the second bonding layer 25 also covers the first sub-portion 111, and the third isolation layer 62 is further arranged on the side of the second bonding layer 25 away from the first sub-portion 111. The third isolation layer 62 overlapping the first sub-portion 111 is provided with a first hollow structure, which can also release the stress of the first sub-portion 111 when the bending portion 13 is bent. For other descriptions, please refer to the above embodiments, which will not be repeated here.

[0090] Based on the same inventive concept, the embodiments of the present application also provide a display device, which comprises the display module 100 of any one of the above embodiments.

[0091] According to the above embodiments, it can be known that:

[0092] The display module and the display device provided by the present application, the display module comprises a display area and a bezel area outside the display area; the display module further comprises a display panel, a first protective layer, a light shielding layer and a first bonding layer, the first protective layer is arranged on the light emitting side of the display panel; the light shielding layer is arranged on the side of the first protective layer close to the display panel, the light shielding layer is located in the bezel area, the first bonding layer is arranged between the first protective layer and the display panel, the first bonding layer is located in the display area and extends from the display area to the bezel area, the first bonding layer is away from at least part of the light shielding layer and contacts, and the first bonding layer overlapping the light shielding layer also overlaps at least part of the bending portion of the display panel, so as to increase the overlapping area of the first bonding layer and the light shielding layer, so that the first bonding layer can fill the gap between the light shielding layer and the first protective layer, reduce the risk of forming bubbles in the first bonding layer at the gap position, and thus improve the problem of bubbles existing in the edge of the display area of the flexible OLED display device.

[0093] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0094] The embodiments of the present application are described in detail above, and the specific examples are applied to the principles and implementation modes of the present application, and the above embodiment description is only used to help understand the technical solutions and core ideas of the present application; those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display module, comprising a display area and a frame area outside the display area; the display module further comprises: a display panel having opposite light-outgoing side and non-light-outgoing side, the display panel comprising a first planar portion, a second planar portion and a bending portion connected between the first planar portion and the second planar portion, the second planar portion being bent to the non-light-outgoing side of the first planar portion through the bending portion, the bending portion being located in the frame area; a first protective layer arranged on the light-outgoing side of the display panel; a light shielding layer arranged on the side of the first protective layer close to the display panel, the light shielding layer being located in the frame area; a first adhesive layer arranged between the first protective layer and the display panel, the first adhesive layer being located in the display area and extending from the display area into the frame area, the first adhesive layer overlapping and contacting at least part of the light shielding layer; wherein the first adhesive layer overlapping the light shielding layer further overlaps at least part of the bending portion.

2. The display module of claim 1, wherein, The display module further comprises: a first adhesive layer, the first adhesive layer at least covering the bending portion; a first isolation layer arranged on the side of the first adhesive layer away from the bending portion, the surface adhesion of the side of the first isolation layer away from the first adhesive layer being less than the surface adhesion of the first adhesive layer.

3. The display module of claim 2, wherein, The elastic modulus of the first isolation layer is less than the elastic modulus of the first adhesive layer.

4. The display module of claim 1, wherein, The display module further comprises: a second protective layer arranged on the side of the first protective layer close to the display panel, the first adhesive layer being located between the second protective layer and the first protective layer; a second adhesive layer arranged on the side of the second protective layer close to the display panel, the second adhesive layer being located in the display area and extending from the display area into the frame area; wherein the second adhesive layer overlaps at least part of the light shielding layer, and the second adhesive layer overlapping the light shielding layer further overlaps at least part of the bending portion.

5. The display module of claim 4, wherein, The width of the first adhesive layer overlapping the light shielding layer is greater than the width of the second adhesive layer overlapping the light shielding layer.

6. The display module of claim 4, wherein, The display module further comprises: a first adhesive layer, the first adhesive layer at least covering the bending portion; a second isolation layer arranged on the side of the first adhesive layer away from the bending portion, the surface adhesion of the side of the second isolation layer away from the first adhesive layer being less than the surface adhesion of the first adhesive layer.

7. The display module of claim 6, wherein, The elastic modulus of the second isolation layer is less than the elastic modulus of the first adhesive layer.

8. The display module of claim 4, wherein, The second adhesive layer extends from the display area into the frame area, and the second adhesive layer extending into the frame area at least covers the bending portion.

9. The display module of claim 8, wherein, The display module further comprises a color filter layer arranged on the light-outgoing side of the display panel, the second adhesive layer covering the color filter layer and extending from the color filter layer to the bending portion.

10. The display module of claim 8, wherein, The display module further comprises a third isolation layer disposed on a side of the second adhesive layer away from the bending portion; wherein a surface adhesion of the third isolation layer on the side away from the second adhesive layer is less than a surface adhesion of the second adhesive layer.

11. The display module of claim 10, wherein, An elastic modulus of the third isolation layer is less than an elastic modulus of the second adhesive layer.

12. The display module of claim 10, wherein, The first planar portion comprises a first sub-portion close to the bending portion, the first sub-portion being located in the frame area, the second adhesive layer further covering the first sub-portion, and the third isolation layer further being disposed on a side of the second adhesive layer away from the first sub-portion; wherein the third isolation layer overlapping the first sub-portion is provided with a first hollow structure.

13. The display module of claim 8, wherein, A surface adhesion of the second adhesive layer covering the bending portion is less than a surface adhesion of the second adhesive layer located between the second protective layer and the display panel.

14. The display module of claim 8, wherein, The first planar portion comprises a first sub-portion close to the bending portion, the first sub-portion being located in the frame area, the second adhesive layer further covering the first sub-portion; wherein the second adhesive layer covering the first sub-portion is provided with a second hollow structure.

15. The display module of claim 4, wherein, An outer boundary of the second protective layer is flush with an outer boundary of the first protective layer.

16. The display module of any one of claims 1 to 15, wherein, A normal projection of the display panel on a first plane is located within a range of a normal projection of the first protective layer on the first plane, and a normal projection area of the first protective layer is greater than a normal projection area of the display panel; wherein the first plane is parallel to a light-outgoing side surface of the display panel.

17. The display module of any one of claims 1 to 15, wherein, An outer boundary of the first adhesive layer is flush with an outer boundary of the first protective layer.

18. A display device comprising the display module according to any one of claims 1 to 17.

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