Backboard assembly and folding display module

Abstract

The invention relates to a backboard assembly and a folding display module. The backboard assembly comprises a substrate layer, a supporting layer, a first connecting glue layer, an isolating layer, a protective layer and a buffer layer. The substrate layer is arranged on one side of the back plate; the supporting layer is arranged on the side, away from the back plate, of the base layer and provided with a hollowed-out part. The first connecting adhesive layer is connected with the substrate layer and the supporting layer, and a notch is formed in the position, corresponding to the hollow part, of the first connecting adhesive layer; the isolating layer covers the hollow part; the protection layer is arranged on one side of the isolation layer deviating from the support layer; the buffer part is arranged between the protective layer and the supporting layer and extends along the peripheral edge of the supporting layer, and the thickness of the buffer part is larger than that of the isolating layer; wherein the buffer supporting layer further comprises a first filling part and a second filling part, in the thickness direction of the buffer supporting layer, the first filling part is connected with the supporting layer and the protective layer in an attached mode, and the second filling part is connected with the isolating layer and the protective layer in an attached mode.

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 display has gradually emerged in the display market, and the market share of foldable display has also increased year by year. In the current flexible folding module process, SUS (full name in English: Stainless Steel, Chinese abbreviation: stainless steel) and BFL (full name in English: Buffer Layer, Chinese abbreviation: buffer layer) are combined to form a BKT composite material layer, and BKT can be bonded to the display panel by rolling and bonding; because BKT has a lower modulus and poorer support at the position of the corresponding module folding area, when BKT is bonded to the display panel, BKT will contact the display panel in advance at the position of the corresponding module folding area, so that in the subsequent rolling process, BKT will be deformed at the position of the corresponding module folding area, 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 and the display panel are bonded together.

[0004] In order to achieve the above-mentioned object, according to a first aspect of the present application, there is provided a back panel assembly, which is applied to a folding display module, wherein the folding display module has two flat areas and a folding area connecting the two flat areas, the folding display module includes a display panel, and the back panel assembly includes:

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

[0006] A support layer is arranged on a side of the base layer away from the display panel, and a hollow portion is arranged at a position of the support layer 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 away from the base layer and correspondingly covering the hollow portion;

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

[0010] A buffer portion is disposed between the protective layer and the supporting layer and is extended along the peripheral edge of the supporting layer, wherein the thickness of the buffer portion is greater than the thickness of the isolation layer;

[0011] Among them, the buffer support layer also includes a first filling part located in the flat area, and a second filling part located in the folding area. In the thickness direction of the buffer support layer, the first filling part is respectively bonded and connected to the support layer and the protective layer, and the second filling part is respectively bonded and connected to the isolation layer and the protective layer.

[0012] In one embodiment, two sides of the first filling portion are respectively bonded to the support layer and the protective layer through two first adhesive layers, and two sides of the second filling portion are respectively bonded to the isolation layer and the protective layer through two second adhesive layers.

[0013] In one embodiment, the first filling portion and the second filling portion are spaced apart from each other;

[0014] On a side close to the protective layer, the first adhesive layer and the second adhesive layer are arranged at intervals;

[0015] On a side close to the supporting layer, the first adhesive layer and the second adhesive layer are arranged at intervals.

[0016] In one embodiment, the first filling portion and the second filling portion are spaced apart from each other;

[0017] 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;

[0018] On a side close to the supporting layer, the first adhesive layer and the second adhesive layer are arranged at intervals.

[0019] In one embodiment, the first supporting adhesive layer comprises an adhesive layer substrate and two sub-adhesive layers, and 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;

[0020] Wherein, the thickness of the adhesive layer substrate is set to be greater than 50 μm.

[0021] In one embodiment, the first filling part and the second filling part are integrally arranged to form a filling layer arranged on the entire surface;

[0022] 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;

[0023] 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.

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

[0025] In one embodiment, the second filling portion is configured as a PET film, the PET film includes a PET film and a film adhesive layer, the film adhesive layer is arranged on a side of the PET film facing the isolation layer, and the film adhesive layer is adhered to the isolation layer;

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

[0027] In one embodiment, 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.

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

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

[0030] In the above-mentioned backplane assembly, the base layer of the backplane assembly is arranged on the side of the backplane away from the display panel, and the support layer is arranged on the side of the base layer away from the backplane.

[0031] The back panel assembly of the embodiment of the present application is applied to a folding display module, and a hollow portion is formed on the support layer of the back panel assembly 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 prevent foreign matter from entering the hollow portion and affecting the bending, an isolation layer is covered on the hollow portion; a protective layer is provided on the side of the isolation layer away from the support layer; at this time, the protective layer and the support layer are spaced apart, and a buffer portion is provided between the protective layer and the support layer and along the peripheral edge of the support layer; because the thickness of the buffer portion is greater than the thickness of the isolation layer, the protective layer is spaced apart from the support layer and the isolation layer. They are evenly spaced, with a first filling portion between the supporting layer and the protective layer, and a second filling portion between the isolating layer and the protective layer, so as to fill the step difference caused by the buffer portion; at the same time, since the first filling portion is bonded to connect the supporting layer and the protective layer, and the second filling portion is bonded to connect the isolating layer and the protective layer, the supporting layer and the protective layer are relatively fixed, thereby improving the support of the supporting layer in the corresponding folding area and reducing the deformation of the supporting layer in the corresponding folding area, thereby preventing the supporting layer from contacting the display panel in advance during the bonding process, thereby improving the problem of wrinkles and bubbles generated after the buffer supporting layer is bonded to the display panel.

[0032] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0034] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0035] Figure 1 It is a schematic diagram of laminating a buffer support layer and a display panel in the prior art;

[0036] Figure 2 A first film layer diagram of a foldable display module provided in an embodiment of the present application;

[0037] Figure 3 A second film layer diagram of the foldable display module provided in an embodiment of the present application;

[0038] Figure 4 for Figure 2 A film layer diagram of the second supporting adhesive layer;

[0039] Figure 5 A third film layer diagram of the foldable display module provided in an embodiment of the present application;

[0040] Figure 6 A plan view of a foldable display module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0042] The embodiment of the present application provides a back panel assembly 100 and a foldable display module 1000. The following are detailed descriptions of each. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0043] In a first aspect, the present invention provides a backplane assembly 100. Figure 2 and Figure 6 , Figure 2 A first film layer diagram of the foldable display module 1000 provided in an embodiment of the present application; Figure 6The schematic plan view of the foldable display module 1000 provided in the embodiment of the present application is as follows. The back panel assembly 100 is applied to the foldable display module 1000, the foldable display module 1000 has two flat areas A and a foldable area B connecting the two flat areas A, and the foldable display module 1000 also includes a display panel 200.

[0044] The back panel assembly 100 includes a base layer 1, a support layer 2, a first connecting adhesive 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 adhesive layer 3 connects the base layer 1 and the support layer 2, and the first connecting adhesive 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 correspondingly 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 is extended along the peripheral edge of the support layer 2, and the thickness of the buffer portion 6 is greater than the thickness of the isolation layer 4.

[0045] It can be known that the support layer 2 forms the hollow portion 21 at the position corresponding to the folding area B, so that when the folding display module 1000 is folded, the flexibility of the support layer 2 in the folding area B can be improved; in order to prevent foreign matter from entering the hollow portion 21 and affecting the bending, and to block the friction between the support layer 2 and other film layers, the isolation layer 4 is covered 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 peripheral 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 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 step caused by the buffer portion 6.

[0046] 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 transfer of the morphology of the hollow portion 21 to the front side 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 easy to deform.

[0047] 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 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 300' starts to roll and squeeze from one side, so that the bubbles generated in the middle position of the back panel assembly 100' cannot be discharged, and wrinkles and bubbles are generated.

[0048] 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, the support of the support layer 2 at the corresponding folding area is improved, and the deformation of the support layer 2 at the corresponding folding area B is reduced, and then in 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.

[0049] 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.

[0050] Typically, the thickness of the isolation layer 4 is set to 16 μm; the buffer portion 6 includes a buffer layer 61 and a third adhesive layer 62, the buffer layer 61 is connected to 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 foam; the thickness of the buffer layer 61 is set to 100 μm; the thickness of the third adhesive layer 62 is set to 25 μm.

[0051] The present application does not impose any specific restrictions on the material of the base layer 1. In one embodiment, the material of the base layer 1 is set to black PI (full name in English: Polyimide, abbreviated in Chinese: polyimide).

[0052] In an embodiment of the present application, the backplane assembly 100 further includes a second connecting adhesive layer 9 , and the second connecting adhesive layer 9 connects the base layer 1 and the backplane 300 .

[0053] In one embodiment of the present application, the protective layer 5 includes a first sublayer 51 and a second sublayer 52, wherein the first sublayer 51 is disposed on the side of the isolation layer 4 away from the support layer 2, and the second sublayer 52 is disposed on the side of the first sublayer 51 away from the isolation layer 4; wherein the buffer portion 6 is disposed between the first sublayer 51 and the support layer 2; the first filling portion 7 connects the support layer 2 and the first sublayer 51; and the second filling portion 8 connects the isolation layer 4 and the first sublayer 51. The stacked first sublayer 51 and the second sublayer 52 can not only provide better protection for the backplane assembly 100, but also improve the support of the support layer 2, and further reduce the deformation of the support layer 2 corresponding to the folding area B.

[0054] See also Figure 2 In the embodiment of the present application, the edge of the isolation layer 4 is arranged beyond the edge of the hollow portion 21; the edge of the second filling portion 8 is arranged flush with the edge of the isolation layer 4, or the edge of the second filling portion 8 is arranged beyond the edge of the isolation layer 4. By setting the edge of the isolation layer 4 beyond the edge of the hollow portion 21, the isolation layer 4 can completely cover the hollow portion 21, thereby preventing foreign matter from entering the hollow portion 21 and affecting the bending; and the edge of the second filling portion 8 is arranged flush with the edge of the isolation layer 4, or the edge of the second filling portion 8 is arranged beyond the edge of the isolation layer 4; in this way, the overlapping area of ​​the second filling portion 8 and the support portion can be increased, thereby further improving the support of the support portion at the position corresponding to the hollow portion 21.

[0055] Specifically, the distance H that the edge of the isolation layer 4 exceeds the edge of the hollow portion 21 is greater than 0.5 μm; in this way, not only can the isolation layer 4 completely cover the hollow portion 21, thereby preventing foreign matter from entering the hollow portion 21 and affecting bending; but it can also increase the overlapping area between the second filling portion 8 and the support portion, thereby further improving the support of the support portion at the position corresponding to the hollow portion 21.

[0056] In one embodiment, two sides of the first filling portion 7 are respectively bonded to the support layer 2 and the protective layer 5 via two first adhesive layers 71 , and two sides of the second filling portion 8 are respectively bonded to the isolation layer 4 and the protective layer 5 via two second adhesive layers 81 .

[0057] The present application does not impose any specific limitation on the forms of the first filling part 7 and the second filling part 8 .

[0058] See also Figure 2 , Figure 2 A first film layer diagram of a folding display module 1000 provided in an embodiment of the present application. In the first embodiment of the present application, the first filling portion 7 and the second filling portion 8 are spaced apart; on the side close to the protective layer 5, the first adhesive layer 71 and the second adhesive layer 81 are spaced apart; on the side close to the supporting layer 2, the first adhesive layer 71 and the second adhesive layer 81 are spaced apart.

[0059] In the first embodiment, in the flat area A, the first filling part 7 is respectively adhered to the support layer 2 and the protective layer 5 by the first adhesive layer 71; in the folding area B, the second filling part 8 is respectively adhered to the isolation layer 4 and the protective layer 5 by the second adhesive layer 81; in this way, the support layer 2 is fixedly connected to the protective layer 5 as a whole, the supporting property of the support layer 2 corresponding to the folding area B is improved, and the deformation of the support layer 2 corresponding to the folding area B is reduced, and then in 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 back panel assembly 100 and the display panel 200 are bonded.

[0060] At the same time, the first filling part 7 and the second filling part 8 fill the step difference caused by the buffer part 6. The thickness of the first filling part 7 is set to 55μm, and the thickness of the first adhesive layer 71 is set to 50μm on the side close to the protective layer 5; the thickness of the second filling part 8 is set to 60μm, and the thickness of the second adhesive layer 81 is set to 50μm on the side close to the protective layer 5.

[0061] 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 its own gravity, the first filling part 7 can be directly connected to the supporting layer 2 .

[0062] It can be known that in the first embodiment, the first filling part 7 and the second filling part 8 are arranged at an interval, so during the bonding process, the first filling part 7 and the second filling part 8 have space for relative movement, so that during 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.

[0063] See also Figure 3 , Figure 3 A second film layer diagram of the foldable display module 1000 provided in an embodiment of the present application. The first filling portion 7 and the second filling portion 8 are spaced apart; on the side close to the protective layer 5, the first adhesive layer 71 and the second adhesive layer 81 are integrally arranged to form a first supporting adhesive layer a; on the side close to the supporting layer 2, the first adhesive layer 71 and the second adhesive layer 81 are spaced apart.

[0064] The difference from the first embodiment is that in the second embodiment of the present application, on the side close to the protective layer 5, the first adhesive layer 71 and the second adhesive layer 81 are integrally arranged and form a first supporting adhesive layer a; the first filling part 7 and the second filling part 8 are adhered by the entire surface of the first supporting adhesive layer a, so during the bonding process, the first filling part 7 and the second filling part 8 are not easy to move relative to each other, so that the back panel assembly 100 is in a flat state during rolling, thereby ensuring that the back panel assembly 100 is smoothly bonded to the back panel 300 to avoid the generation of bubbles and wrinkles.

[0065] Also, see Figure 4 The first adhesive layer 71 and the second adhesive layer 81 are integrally arranged and form a first supporting adhesive layer a; since the first filling portion 7 and the second filling portion 8 are spaced apart, it is necessary to further improve the supporting performance of the first supporting adhesive layer a. In the second embodiment of the present application, the thickness of the first filling portion 7 is set to 55μm, the thickness of the second filling portion 8 is set to 35μm, and the thickness of the first supporting adhesive layer a is set to 75μm.

[0066] The first supporting adhesive layer a includes an adhesive layer substrate a1 and two sub-adhesive layers a2. In the thickness direction F1 of the backplane assembly 100, the two sub-adhesive layers a2 are respectively arranged on both sides of the adhesive layer substrate a1, wherein the thickness of the adhesive layer substrate a1 is set to be greater than 50 μm. By increasing the thickness of the adhesive layer substrate a1, the thickness of the first supporting adhesive layer a is increased as a whole, thereby improving the support of the first supporting adhesive layer a, and further making the backplane assembly 100 in a flat state, it can ensure that the backplane assembly 100 is smoothly attached to the backplane 300 to avoid bubbles and wrinkles.

[0067] See also Figure 5 , Figure 5 This is a third film layer diagram of the foldable display module 1000 provided in an embodiment of the present application. The first filling part 7 and the second filling part 8 are integrally arranged to form a filling layer c arranged on the entire surface; on the side close to the protective layer 5, the first adhesive layer 71 and the second adhesive layer 81 are integrally arranged to form a first supporting adhesive layer a; on the side close to the supporting layer 2, the first adhesive layer 71 and the second adhesive layer 81 are integrally arranged to form a second supporting adhesive layer b.

[0068] The difference from the second embodiment is that, in the third embodiment of the present application, the first filling part 7 and the second filling part 8 are integrally arranged and form a filling layer c arranged on the entire surface; the filling layer c is adhered to the protective layer 5 through the first supporting adhesive layer a; the filling layer c is adhered to the supporting layer 2 through the second supporting adhesive layer b; therefore, during the bonding process, there is no problem of relative movement between the first filling part 7 and the second filling part 8, thereby making the back panel assembly 100 more flat during rolling, thereby ensuring that the back panel assembly 100 is smoothly bonded to the back panel 300 to avoid the generation of bubbles and wrinkles.

[0069] It can be known that, since the filling layer c is adhered to the protective layer 5 through the first supporting adhesive layer a; the filling layer c is adhered to the supporting layer 2 through the second supporting adhesive layer b, the first supporting adhesive layer a does not have too high supporting requirements, the thickness of the first supporting adhesive layer a is set to 50μm, and the thickness of the entire filling layer c is set to 60μm.

[0070] The first adhesive layer 71 and the second adhesive layer 81 are not specifically limited in the present application. In the first embodiment, the second embodiment and the third embodiment, the first adhesive layer 71 and the second adhesive layer 81 are both configured as double-sided adhesive layers.

[0071] In another embodiment, the second filling portion 8 is configured as a PET film, which includes a PET film and a film adhesive layer, the film adhesive layer is arranged on the 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 the second adhesive layer 81.

[0072] Furthermore, no matter the second filling part 8 is bonded by double-sided adhesive or configured as a PET film, the adhesion between the second filling part 8 and the isolation layer 4 is smaller than the adhesion between the second filling part 8 and the protective layer 5 .

[0073] In a second aspect, the present application embodiment provides a foldable display module 1000, see Figure 2 The foldable display module 1000 includes a display panel 200 and a back panel assembly 100. A back panel 300 is disposed on the back side of the display panel 200. The back panel assembly 100 is disposed on the back side of the display panel 200. The foldable display module 1000 has two flat areas A and two folding areas B between the flat areas A. The display panel 200 includes two flat portions and a folding portion connecting the two flat portions. The display portion is located in the flat area A, and the folding portion is located in the folding area B.

[0074] It should be noted that the back panel assembly 100 is configured as the above-mentioned back panel assembly 100, that is, the back panel assembly 100 includes all the technical features of the above-mentioned back panel assembly 100, and the folding display module 1000 includes all the embodiments of the above-mentioned back panel assembly 100, and also has all the technical effects of the above-mentioned embodiments, which will not be elaborated here one by one.

[0075] The base layer 1 of the backplane assembly 100 is disposed on a side of the backplane 300 away from the display panel 200 , and the support layer 2 is disposed on a side of the base layer 1 away from the backplane 300 .

[0076] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0077] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0078] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0079] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still 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 back panel assembly comprises: A substrate layer, disposed on the back side of the display panel; A support layer is arranged on a side of the base layer away from the display panel, and a hollow portion is arranged at a position of the support layer 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 away from the base layer and correspondingly covering the hollow portion; a protective layer, disposed on a side of the isolation layer away from the support layer; and A buffer portion is disposed between the protective layer and the supporting layer and is extended along the peripheral edge of the supporting layer, wherein the thickness of the buffer portion is greater than the thickness of the isolation layer; Among them, the buffer support layer also includes a first filling part located in the flat area, and a second filling part located in the folding area. In the thickness direction of the buffer support layer, the first filling part is respectively bonded and connected to the support layer and the protective layer, and the second filling part is respectively bonded and connected to the isolation layer and the protective layer.

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

3. The back plate assembly according to claim 2, characterized in that: The first filling part and the second filling part are arranged at intervals; On a side close to the protective layer, the first adhesive layer and the second adhesive layer are arranged at intervals; On a side close to the supporting layer, the first adhesive layer and the second adhesive layer are arranged at intervals.

4. The back plate assembly according to claim 2, characterized in that: The first filling part and the second filling part are arranged at intervals; 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 arranged at intervals.

5. The back plate assembly according to claim 4, characterized in that: The first supporting adhesive layer comprises an adhesive layer substrate and two sub-adhesive layers, and 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, characterized in that: The first filling part and the second filling part are integrally arranged to form a filling layer arranged 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, characterized in that: 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 includes a PET film and a film adhesive layer, the film adhesive layer is arranged on a side of the PET film facing the isolation layer, and the film adhesive layer is 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 disposed on the back side of the display panel; and According to the backplane assembly as described in any one of claims 1 to 9, 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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