Backboard assembly and folding display module

Abstract

The application relates to a back plate assembly and a folding display module. The back plate assembly comprises a substrate layer, a support layer, a first connecting glue layer, an isolation layer, a protective layer and a buffer layer. The substrate layer is arranged on one side of the back plate. The support layer is arranged on the side of the substrate layer away from the back plate and is provided with a hollow part. The first connecting glue layer connects the substrate layer and the support layer and is provided with a gap at the position corresponding to the hollow part. The isolation layer covers the hollow part. The protective layer is arranged on the side of the isolation layer away from the support layer. The buffer part is arranged between the protective layer and the support layer and is arranged along the circumferential edge of the support layer. The thickness of the buffer part is greater than the thickness of the isolation layer. The buffer support layer further comprises a first filling part and a second filling part. In the thickness direction of the buffer support layer, the first filling part is connected with the support layer and the protective layer, and the second filling part is connected with the isolation layer and the protective layer.

Description

Technical Field

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

[0002] With the development of display technology, foldable displays have gradually emerged in the display market, and the market share of foldable displays has also increased year by year. In the current flexible foldable module process, SUS (full name: Stainless Steel, Chinese abbreviation: stainless steel) and BFL (full name: Buffer Layer, Chinese abbreviation: buffer layer) are combined to form a BKT composite material layer. BKT can be laminated to the display panel through rolling. Because the modulus of BKT is low and the support is poor at the position corresponding to the folding area of ​​the module, when the BKT is laminated to the display panel, the BKT will contact the display panel in the position corresponding to the folding area of ​​the module in advance. As a result, during the subsequent rolling process, the BKT will deform in the position corresponding to the folding area of ​​the module, and wrinkles and bubbles will be generated. Summary of the Invention

[0003] The embodiments of the present application provide a back panel assembly and a foldable display module, which improve the problem of wrinkles and bubbles generated after the buffer support layer is bonded to the display panel.

[0004] To achieve the above objectives, according to a first aspect of the present application, a backplane assembly is provided for use in a foldable display module, wherein the foldable display module has two flat areas and a folding area connecting the two flat areas. The foldable display module includes a display panel. The backplane assembly includes:

[0005] a base layer, disposed on the back side of the display panel;

[0006] a supporting layer, disposed on a side of the base layer facing away from the display panel, wherein the supporting layer is provided with a hollow portion at a position corresponding to the folding area;

[0007] a first connecting adhesive layer, connecting the base layer and the supporting layer, wherein the first connecting adhesive layer is provided with a notch at a position corresponding to the hollow portion;

[0008] an isolation layer, disposed on a side of the support layer facing away from the base layer and correspondingly covering the hollow portion;

[0009] a protective layer, disposed on a side of the isolation layer facing away from the support layer; and

[0010] a buffer portion, disposed between the protective layer and the support layer and extending along a peripheral edge of the support layer, wherein the thickness of the buffer portion is greater than the thickness of the isolation layer;

[0011] The buffer support layer comprises a first filling part located in the flat area and a second filling part located in the folding area, the first filling part is connected with the support layer and the protection layer respectively in the thickness direction of the buffer support layer, and the second filling part is connected with the isolation layer and the protection layer respectively.

[0012] In an embodiment, the two sides of the first filling part are adhered to the support layer and the protection layer through two first adhesive layers respectively, and the two sides of the second filling part are adhered to the isolation layer and the protection layer through two second adhesive layers respectively.

[0013] In an embodiment, the first filling part and the second filling part are arranged in a spaced manner.

[0014] On the side close to the protection layer, the first adhesive layer and the second adhesive layer are arranged in a spaced manner.

[0015] On the side close to the support layer, the first adhesive layer and the second adhesive layer are arranged in a spaced manner.

[0016] In an embodiment, the first filling part and the second filling part are arranged in a spaced manner.

[0017] On the side close to the protection layer, the first adhesive layer and the second adhesive layer are arranged in an integrated manner and form a first support adhesive layer.

[0018] On the side close to the support layer, the first adhesive layer and the second adhesive layer are arranged in a spaced manner.

[0019] In an embodiment, the first support adhesive layer comprises an adhesive layer substrate and two sub-adhesive layers, and the two sub-adhesive layers are arranged on the two sides of the adhesive layer substrate in the thickness direction of the buffer support layer.

[0020] The thickness of the adhesive layer substrate is greater than 50 μm.

[0021] In an embodiment, the first filling part and the second filling part are arranged in an integrated manner and form a filling layer arranged in an overall manner.

[0022] On the side close to the protection layer, the first adhesive layer and the second adhesive layer are arranged in an integrated manner and form a first support adhesive layer.

[0023] On the side close to the support layer, the first adhesive layer and the second adhesive layer are arranged in an integrated manner and form a second support adhesive layer.

[0024] In an embodiment, the first adhesive layer and the second adhesive layer are both arranged as double-sided adhesive layers.

[0025] In an embodiment, the second filling part is configured as a PET film, the PET film comprising a PET film and a film adhesive layer, the film adhesive layer being arranged on one side of the PET film facing the isolation layer, and the film adhesive layer being adhered to the isolation layer.

[0026] The PET film is adhered to the protective layer through a second adhesive layer.

[0027] In an embodiment, the adhesion between the second filling part and the isolation layer is less than the adhesion between the second filling part and the protective layer.

[0028] According to a second aspect of the present application, a folding display module is provided, comprising:

[0029] a display panel, a back plate being arranged on a back side of the display panel; and

[0030] The back plate assembly described above, the base layer of the back plate assembly being arranged on a side of the back plate facing away from the display panel, and the support layer being arranged on a side of the base layer facing away from the back plate.

[0031] The back plate assembly of the embodiments of the present application is applied to the folding display module. The support layer of the back plate assembly forms a hollow part at a position corresponding to the folding area, so that when the folding display module is folded, the flexibility of the support layer in the folding area can be improved. In order to avoid foreign matter entering the hollow part and affecting the bending, a layer of isolation layer is covered on the hollow part. A protective layer is arranged on a side of the isolation layer facing away from the support layer. At this time, the protective layer is arranged in a spaced manner between the support layer and the isolation layer. A buffer part is arranged between the protective layer and the support layer and along the peripheral edge of the support layer. Since the thickness of the buffer part is greater than the thickness of the isolation layer, the protective layer is arranged in a spaced manner between the support layer and the isolation layer. A first filling part is arranged between the support layer and the protective layer, and a second filling part is arranged between the isolation layer and the protective layer, so as to fill the gap caused by the buffer part. At the same time, since the first filling part is connected to the support layer and the protective layer in a bonded manner, and the second filling part is connected to the isolation layer and the protective layer in a bonded manner, the support layer and the protective layer are relatively fixed, the supportability of the support layer at the position corresponding to the folding area is improved, the deformation amount of the support layer at the position corresponding to the folding area is reduced, and thus in the bonding process, the support layer is prevented from being in contact with the display panel in advance, so as to improve the problem of wrinkles and bubbles generated after the bonding of the buffer support layer and the display panel.

[0032] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description only some of the embodiments of the present application, for those skilled in the art, without paying creative labor, can also be obtained from these drawings other drawings.

[0034] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description indicate the same parts.

[0035] Figure 1 for the schematic diagram of the existing technology of the buffer support layer and the display panel;

[0036] Figure 2 for the first film layer diagram of the folding display module provided by the embodiment of the present application;

[0037] Figure 3 for the second film layer diagram of the folding display module provided by the embodiment of the present application;

[0038] Figure 4 for the film layer diagram of the second support adhesive layer in Figure 2 ;

[0039] Figure 5 for the third film layer diagram of the folding display module provided by the embodiment of the present application;

[0040] Figure 6 for the planar schematic diagram of the folding display module provided by the embodiment of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application are described clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without paying creative labor are within the protection scope of the present application.

[0042] The embodiment of the present application provides a backboard assembly 100 and a folding display module 1000. The following are described in detail respectively. It should be noted that the description order of the following embodiments is not limited as the preferred order of the embodiments.

[0043] In the first aspect, the embodiment of the present application provides a backboard assembly 100, please refer to Figure 2 and Figure 6 , Figure 2 for the first film layer diagram of the folding display module 1000 provided by the embodiment of the present application; Figure 6A planar schematic view of a folding display module 1000 is provided for embodiments of the present application. The back plate assembly 100 is applied to the folding display module 1000, which has two flat areas A and a folding area B connecting the two flat areas A, and further includes a display panel 200.

[0044] The back plate assembly 100 includes a base layer 1, a support layer 2, a first connecting glue layer 3, an isolation layer 4, a protective layer 5, and a buffer portion 6. The base layer 1 is arranged on the back side of the display panel 200. The support layer 2 is arranged on the side of the base layer 1 away from the display panel 200, and the support layer 2 is arranged as a hollow portion 21 at a position corresponding to the folding area B. The first connecting glue layer 3 connects the base layer 1 and the support layer 2, and the first connecting glue layer 3 is arranged as a notch 31 at a position corresponding to the hollow portion 21. The isolation layer 4 is arranged on the side of the support layer 2 away from the base layer 1, and covers the hollow portion 21. The protective layer 5 is arranged on the side of the isolation layer 4 away from the support layer 2. The buffer portion 6 is arranged between the protective layer 5 and the support layer 2, and extends along the circumferential edge of the support layer 2. The thickness of the buffer portion 6 is greater than the thickness of the isolation layer 4.

[0045] It can be understood that the support layer 2 is arranged as the hollow portion 21 at a position corresponding to the folding area B, so as to improve the flexibility of the support layer 2 at the folding area B when the folding display module 1000 is folded. In order to avoid foreign matter from entering the hollow portion 21 and affecting bending, and to block the friction between the support layer 2 and other film layers, the isolation layer 4 is arranged on the hollow portion 21. The protective layer 5 is arranged on the side of the isolation layer 4 away from the support layer 2. The buffer portion 6 is arranged between the protective layer 5 and the support layer 2, and along the circumferential edge of the support layer 2. Since the thickness of the buffer portion 6 is greater than the thickness of the isolation layer 4, the protective layer 5 is arranged spaced apart from the support layer 2 and the isolation layer 4. The first filling portion 7 is arranged between the support layer 2 and the protective layer 5, and the second filling portion 8 is arranged between the isolation layer 4 and the protective layer 5, so as to fill the gap caused by the buffer portion 6.

[0046] It should be noted that the first filling portion 7, the second filling portion 8, and the buffer portion 6 constitute a buffer support layer.

[0047] In the prior art, the second filling portion 8 and the isolation layer 4 are not connected and fixed, and the first connecting adhesive layer 3 connecting the base layer 1 and the support layer 2 forms a notch 31 at the position corresponding to the hollow portion 21. The setting of the notch 31 can reduce the overall stress of the folding display module 1000 when the folding display module 1000 is folded, thereby avoiding the morphology of the hollow portion 21 from being transferred to the front of the folding display module 1000 during the bonding process, thereby improving the appearance of the folding display module 1000; that is, both sides of the hollow portion 21 are not fixed, resulting in extremely poor support of the support layer 2 corresponding to the hollow portion 21; and since the hollow portion 21 has a high flexibility, the hollow portion 21 has a low elastic modulus and is very prone to deformation.

[0048] In the actual process, please refer to Figure 1 , the back panel 300' will be bonded to the display panel 200' first, and then the back panel assembly 100' will be bonded to the back panel 300'; when the back panel assembly 100' is bonded to the back panel 300', due to the influence of its own gravity, the back panel assembly 100' will be deformed at the position corresponding to the hollow portion 21' and will contact the back panel 300' in advance; in the subsequent rolling process, the roller starts to roll and squeeze from one side, thereby causing the bubbles generated in the middle position of the back panel assembly 100' to be unable to be discharged, thereby generating wrinkles and bubbles.

[0049] However, in the present application, the backplane assembly 100 includes a first filling portion 7 located in the flattening area A, and a second filling portion 8 located in the folding area B. In the thickness direction F1 of the backplane assembly 100, the first filling portion 7 connects the support layer 2 and the protective layer 5, and the second filling portion 8 connects the isolation layer 4 and the protective layer 5. Since the first filling portion 7 is bonded to connect the support layer 2 and the protective layer 5, and the second filling portion 8 is bonded to connect the isolation layer 4 and the protective layer 5, the support layer 2 and the protective layer 5 are relatively fixed, thereby improving the support of the support layer 2 at the corresponding folding area and reducing the deformation of the support layer 2 at the corresponding folding area B. In addition, during the bonding process, the support layer 2 is prevented from contacting the display panel 200 in advance, thereby improving the problem of wrinkles and bubbles generated after the support layer 2 and the display panel 200 are bonded.

[0050] In the embodiment of the present application, two first filling parts 7 are provided, and the two first filling parts 7 are provided corresponding to the two flattening areas A respectively.

[0051] Generally, the thickness of the isolation layer 4 is set to 16pm; the buffer part 6 comprises a buffer layer 61 and a third adhesive layer 62, the buffer layer 61 is connected with the protective layer 5, and the third adhesive layer 62 connects the buffer layer 61 and the support layer 2; the material of the buffer layer 61 is set to be foam; the thickness of the buffer layer 61 is set to be 100pm; and the thickness of the third adhesive layer 62 is set to be 25pm.

[0052] The material of the base layer 1 is not specifically limited in the present application. In an embodiment, the material of the base layer 1 is set to be black PI (English full name: Polyimide, Chinese abbreviation: Polyimide).

[0053] In an embodiment of the present application, the backboard assembly 100 further comprises a second connecting adhesive layer 9, which connects the base layer 1 and the backboard 300.

[0054] In an embodiment of the present application, the protective layer 5 comprises a first sub-layer 51 and a second sub-layer 52, the first sub-layer 51 is arranged on the side of the isolation layer 4 away from the support layer 2, and the second sub-layer 52 is arranged on the side of the first sub-layer 51 away from the isolation layer 4; wherein the buffer part 6 is arranged between the first sub-layer 51 and the support layer 2; the first filling part 7 connects the support layer 2 and the first sub-layer 51; and the second filling part 8 connects the isolation layer 4 and the first sub-layer 51. The first sub-layer 51 and the second sub-layer 52 arranged in layers can not only provide better protection for the backboard assembly 100, but also improve the supportability of the support layer 2, further reducing the deformation amount of the support layer 2 at the folding area B.

[0055] Please refer to Figure 2 In an embodiment of the present application, the edge of the isolation layer 4 is arranged beyond the edge of the hollow part 21; the edge of the second filling part 8 is arranged flush with the edge of the isolation layer 4, or the edge of the second filling part 8 is arranged beyond the edge of the isolation layer 4. By arranging the edge of the isolation layer 4 beyond the edge of the hollow part 21, the isolation layer 4 can completely cover the hollow part 21, thereby avoiding foreign matter from entering the hollow part 21 and affecting the bending; and the edge of the second filling part 8 is arranged flush with the edge of the isolation layer 4, or the edge of the second filling part 8 is arranged beyond the edge of the isolation layer 4; in this way, the overlapping area of the second filling part 8 and the support part can be increased, thereby further improving the supportability of the support part at the position corresponding to the hollow part 21.

[0056] Specifically, the distance H between the edge of the isolation layer 4 and the edge of the hollow part 21 is greater than 0.5 μm; in this way, not only can the isolation layer 4 completely cover the hollow part 21, thereby avoiding foreign matter from entering the hollow part 21 and affecting the bending, but also can increase the overlapping area of the second filling part 8 and the support part, thereby further improving the support property of the support part at the position corresponding to the hollow part 21.

[0057] In an embodiment, the two sides of the first filling part 7 are respectively bonded to the support layer 2 and the protection layer 5 through two first adhesive layers 71, and the two sides of the second filling part 8 are respectively bonded to the isolation layer 4 and the protection layer 5 through two second adhesive layers 81.

[0058] The present application does not make specific limitations on the forms of the first filling part 7 and the second filling part 8.

[0059] Please refer to Figure 2 , Figure 2 The first film layer diagram of the folding display module 1000 provided by the embodiment of the present application is shown in the first embodiment of the present application, the first filling part 7 and the second filling part 8 are arranged at intervals, the first adhesive layer 71 and the second adhesive layer 81 are arranged at intervals on the side close to the protection layer 5, and the first adhesive layer 71 and the second adhesive layer 81 are arranged at intervals on the side close to the support layer 2.

[0060] In the first embodiment, in the flat area A, the first filling part 7 is bonded to the support layer 2 and the protection layer 5 through the first adhesive layer 71, and in the folding area B, the second filling part 8 is bonded to the isolation layer 4 and the protection layer 5 through the second adhesive layer 81; in this way, the support layer 2 is fixedly connected to the protection layer 5 as a whole, the support property of the support layer 2 at the position corresponding to the folding area B is improved, the deformation amount of the support layer 2 at the position corresponding to the folding area B is reduced, and thus in the process of lamination, the support layer 2 is prevented from being in contact with the display panel 200 in advance, thereby improving the problem of wrinkles and bubbles generated after the lamination of the back plate assembly 100 and the display panel 200.

[0061] Meanwhile, the first filling part 7 and the second filling part 8 fill the gap caused by the buffer part 6, the thickness of the first filling part 7 is set to 55 μm, the thickness of the first adhesive layer 71 on the side close to the protection layer 5 is set to 50 μm, the thickness of the second filling part 8 is set to 60 μm, and the thickness of the second adhesive layer 81 on the side close to the protection layer 5 is set to 50 μm.

[0062] It can be known that, although the total thickness of the second filling part 8 and the isolation layer 4 is greater than the total thickness of the first filling part 7, under the influence of self-gravity factors, the first filling part 7 can be directly connected with the support layer 2.

[0063] It can be known that, in the first embodiment, the first filling part 7 and the second filling part 8 are arranged in a spaced manner, so that in the process of lamination, the first filling part 7 and the second filling part 8 have a relatively active space, so that when rolling, there is still a risk of generating bubbles and wrinkles at the position corresponding to the first filling part 7 and the second filling part 8.

[0064] Please refer to Figure 3 , Figure 3 The second film layer diagram of the folding display module 1000 provided by the embodiment of the application is shown. The first filling part 7 and the second filling part 8 are arranged in a spaced manner; on the side close to the protection layer 5, the first adhesive layer 71 and the second adhesive layer 81 are arranged in an integrated manner and form a first supporting adhesive layer a; on the side close to the support layer 2, the first adhesive layer 71 and the second adhesive layer 81 are arranged in a spaced manner.

[0065] The difference from the first embodiment is that, in the second embodiment of the application, on the side close to the protection layer 5, the first adhesive layer 71 and the second adhesive layer 81 are arranged in an integrated manner and form a first supporting adhesive layer a; the first filling part 7 and the second filling part 8 are adhered through the first supporting adhesive layer a in the whole surface, so that in the process of lamination, the first filling part 7 and the second filling part 8 are not easy to move relatively, so that when rolling, the backboard assembly 100 is in a flat state, thereby ensuring that the backboard assembly 100 is laminated with the backboard 300 smoothly, and bubbles and wrinkles are avoided.

[0066] And, please refer to Figure 4 , the first adhesive layer 71 and the second adhesive layer 81 are arranged in an integrated manner and form a first supporting adhesive layer a; since the first filling part 7 and the second filling part 8 are arranged in a spaced manner, it is necessary to further improve the supporting performance of the first supporting adhesive layer a, in the second embodiment of the application, the thickness of the first filling part 7 is set to 55 μm, the thickness of the second filling part 8 is set to 35 μm, and the thickness of the first supporting adhesive layer a is set to 75 μm.

[0067] The first supporting glue layer a includes a glue layer substrate a1 and two layers of sub-glue layers a2, which are respectively arranged on both sides of the glue layer substrate a1 in the thickness direction F1 of the back plate assembly 100, wherein the thickness of the glue layer substrate a1 is greater than 50 μm. By increasing the thickness of the glue layer substrate a1, the thickness of the first supporting glue layer a is increased as a whole, thereby improving the supporting property of the first supporting glue layer a, further making the back plate assembly 100 in a flat state, and ensuring that the back plate assembly 100 is smoothly attached to the back plate 300, avoiding bubbles and wrinkles.

[0068] Please refer to Figure 5 , Figure 5 The third film layer diagram of the folding display module 1000 provided by the embodiment of the application is shown. The first filling part 7 and the second filling part 8 are integrally arranged and form a filling layer c arranged on the whole surface. The first glue layer 71 and the second glue layer 81 are integrally arranged and form a first supporting glue layer a on the side close to the protective layer 5. The first glue layer 71 and the second glue layer 81 are integrally arranged and form a second supporting glue layer b on the side close to the supporting layer 2.

[0069] The difference between the second embodiment and the third embodiment of the application is that, in the third embodiment of the application, the first filling part 7 and the second filling part 8 are integrally arranged and form a filling layer c arranged on the whole surface. The filling layer c is adhered to the protective layer 5 through the first supporting glue layer a. The filling layer c is adhered to the supporting layer 2 through the second supporting glue layer b. Therefore, in the attachment process, there is no relative movement problem of the first filling part 7 and the second filling part 8, so that the back plate assembly 100 is in a more flat state when rolling, thereby ensuring that the back plate assembly 100 is smoothly attached to the back plate 300, avoiding bubbles and wrinkles.

[0070] It can be known that, since the filling layer c is adhered to the protective layer 5 through the first supporting glue layer a and the filling layer c is adhered to the supporting layer 2 through the second supporting glue layer b, the first supporting glue layer a does not have too high supporting property requirement, and the thickness of the first supporting glue layer a is set to 50 μm, and the thickness of the whole filling layer c is set to 60 μm.

[0071] The first glue layer 71 and the second glue layer 81 are not specifically limited in the application. In the first embodiment, the second embodiment and the third embodiment, the first glue layer 71 and the second glue layer 81 are both arranged as double-sided glue layers.

[0072] In another embodiment, the second filling part 8 is configured as a PET film piece, which comprises a PET film and a film adhesive layer, the film adhesive layer is arranged on one side of the PET film facing the isolation layer 4, and the film adhesive layer is adhered to the isolation layer 4; wherein the PET film is adhered to the protective layer 5 through a second adhesive layer 81.

[0073] And no matter whether the second filling part 8 is adhered by double-sided adhesive or is configured as a PET film piece, the adhesion between the second filling part 8 and the isolation layer 4 is less than the adhesion between the second filling part 8 and the protective layer 5.

[0074] In a second aspect, the embodiments of the present application provide a folding display module 1000, please refer to Figure 2 , the folding display module 1000 comprises a display panel 200 and a back plate assembly 100, the back side of the display panel 200 is provided with a back plate 300, and the back plate assembly 100 is arranged on the back side of the display panel 200. The folding display module 1000 has two flat areas A and two folding areas B of the flat areas A; the display panel 200 comprises two flat parts and a folding part connecting the two flat parts, the display part is located in the flat area A, and the folding part is located in the folding area B.

[0075] It should be noted that the back plate assembly 100 is set as the above-mentioned back plate assembly 100, that is, the back plate assembly 100 comprises all the technical features of the above-mentioned back plate assembly 100, and the folding display module 1000 comprises all the embodiments of the above-mentioned back plate assembly 100, and has all the technical effects of the above-mentioned embodiments, which will not be described here.

[0076] The base layer 1 of the back plate assembly 100 is arranged on the side of the back plate 300 away from the display panel 200, and the support layer 2 is arranged on the side of the base layer 1 away from the back plate 300.

[0077] In the description of the present application, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0078] 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.

[0079] The embodiments, implementation manners and related technical features of the present application can be combined with each other without conflict.

[0080] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application without departing from the technical solution content of the present application still falls within the scope of the technical solution of the present application.

Claims

1. A back panel assembly, applied to a folding display module, wherein the folding display module has two flat areas and a folding area connecting the two flat areas, and the folding display module includes a display panel, characterized in that: The backplane assembly comprises: a base layer, disposed on the back side of the display panel; a supporting layer, disposed on a side of the base layer facing away from the display panel, wherein the supporting layer is provided with a hollow portion at a position corresponding to the folding area; a first connecting adhesive layer, connecting the base layer and the supporting layer, wherein the first connecting adhesive layer is provided with a notch at a position corresponding to the hollow portion; an isolation layer, disposed on a side of the support layer facing away from the base layer and correspondingly covering the hollow portion; a protective layer, disposed on a side of the isolation layer facing away from the support layer; and a buffer portion, disposed between the protective layer and the support layer and extending along a peripheral edge of the support layer, wherein the thickness of the buffer portion is greater than the thickness of the isolation layer; The buffer support layer includes a first filling portion located in the flat area and a second filling portion located in the folding area. In the thickness direction of the buffer support layer, the first filling portion is respectively bonded and connected to the support layer and the protective layer, and the second filling portion is respectively bonded and connected to the isolation layer and the protective layer.

2. The back plate assembly according to claim 1, wherein: Both sides of the first filling portion are adhered to the support layer and the protective layer through two first adhesive layers, and both sides of the second filling portion are adhered to the isolation layer and the protective layer through two second adhesive layers.

3. The back plate assembly according to claim 2, wherein: The first filling portion and the second filling portion are spaced apart; On a side close to the protective layer, the first adhesive layer and the second adhesive layer are spaced apart; On a side close to the supporting layer, the first adhesive layer and the second adhesive layer are spaced apart.

4. The back plate assembly according to claim 2, wherein: The first filling portion and the second filling portion are spaced apart; On a side close to the protective layer, the first adhesive layer and the second adhesive layer are integrally arranged to form a first supporting adhesive layer; On a side close to the supporting layer, the first adhesive layer and the second adhesive layer are spaced apart.

5. The back plate assembly according to claim 4, wherein: The first supporting adhesive layer includes an adhesive layer substrate and two sub-adhesive layers. In the thickness direction of the buffer supporting layer, the two sub-adhesive layers are respectively arranged on both sides of the adhesive layer substrate; Wherein, the thickness of the adhesive layer substrate is set to be greater than 50 μm.

6. The back plate assembly according to claim 2, wherein: The first filling part and the second filling part are integrally provided and form a filling layer provided on the entire surface; On a side close to the protective layer, the first adhesive layer and the second adhesive layer are integrally arranged to form a first supporting adhesive layer; On a side close to the supporting layer, the first adhesive layer and the second adhesive layer are integrally arranged to form a second supporting adhesive layer.

7. The back plate assembly according to claim 2, wherein: The first adhesive layer and the second adhesive layer are both configured as double-sided adhesive layers.

8. The back plate assembly according to claim 1, wherein: The second filling portion is configured as a PET film sheet, the PET film sheet comprising a PET film and a film adhesive layer, the film adhesive layer being provided on a side of the PET film facing the isolation layer, the film adhesive layer being adhered to the isolation layer; Wherein, the PET film is adhered to the protective layer through a second adhesive layer.

9. The back plate assembly according to claim 2 or 8, characterized in that: The adhesion force between the second filling part and the isolation layer is smaller than the adhesion force between the second filling part and the protection layer.

10. A foldable display module, characterized in that: include: A display panel, a back plate being provided on the back side of the display panel; and The backplane assembly according to any one of claims 1 to 9, wherein the base layer of the backplane assembly is arranged on a side of the backplane facing away from the display panel, and the supporting layer is arranged on a side of the base layer facing away from the backplane.

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