Flexible display module and foldable display device

Abstract

The application provides a flexible display module and a foldable display device. The flexible display module comprises a display panel, a cover plate assembly and a protection assembly arranged on the light-emitting side of the display panel, and a support assembly arranged on the back side of the display panel. In the thickness direction of the flexible display panel, the vertical orthographic projection of the protection assembly is located in the vertical orthographic projection of the cover plate assembly, and the vertical orthographic projection area of the protection assembly is smaller than the vertical orthographic projection area of the cover plate assembly. The thickness of the adhesive material in the protection assembly is greater than the thickness of the adhesive layer in the support assembly, and the thickness of the adhesive layer in the cover plate assembly is 2 to 3 times the thickness of the adhesive layer in the support assembly. The thickness of the adhesive layer in the support assembly is reduced, and the thickness of the adhesive layer in the protection assembly and the cover plate assembly is increased, so that the thinning and weight reduction of the flexible display module are realized without sacrificing mechanical reliability.

Description

TECHNICAL FIELD

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

[0002] At present, thinning and weight reduction of foldable display products is the main development trend, so it is necessary to simplify the stack design of the flexible display module of the foldable display product to realize the thinning and weight reduction of the flexible display module. For example, the thickness of the flexible display module can be thinned by reducing the thickness of the film layer or the adhesive layer on the flexible display module, but the mechanical reliability of the flexible display module will be sacrificed at the same time. Therefore, it is necessary to propose an optimized design of the flexible display module to realize the thinning and weight reduction of the flexible display module without sacrificing the mechanical reliability. SUMMARY

[0003] The present application provides a flexible display module and a foldable display device to realize the thinning and weight reduction of the flexible display module without sacrificing the mechanical reliability.

[0004] To solve the above problems, the technical scheme provided by the present application is as follows:

[0005] The present application provides a flexible display module, which comprises:

[0006] a display panel;

[0007] a cover plate assembly arranged on the light exit side of the display panel;

[0008] a protection assembly arranged on the side of the cover plate assembly away from the display panel;

[0009] a support assembly arranged on the side of the display panel away from the cover plate assembly;

[0010] In the thickness direction of the flexible display module, the vertical projection of the protection assembly is located within the vertical projection of the cover plate assembly, and the vertical projection area of the protection assembly is smaller than the vertical projection area of the cover plate assembly. The thickness of the adhesive material in the protection assembly is greater than or equal to the thickness of the adhesive layer in the support assembly, and the thickness of the adhesive layer in the cover plate assembly is 2 to 3 times the thickness of the adhesive layer in the support assembly.

[0011] In the flexible display module provided by the present application, the protection assembly comprises a first protection layer, a first buffer layer and a first transparent adhesive layer. The first buffer layer is attached to the cover plate assembly through the first transparent adhesive layer, and the first protection layer is located on the side of the first buffer layer away from the cover plate assembly.

[0012] The support assembly comprises a first support layer, an auxiliary support layer, a first adhesive layer and a second adhesive layer, the first support layer is attached to the display panel through the first adhesive layer, the auxiliary support layer is located on a side of the first support layer away from the display panel and is attached to the first support layer through the second adhesive layer;

[0013] In the thickness direction of the flexible display module, the thickness of the protection assembly is greater than or equal to the thickness of the support assembly.

[0014] In the flexible display module provided in the embodiments of the present application, the thickness of the first transparent adhesive layer is greater than the sum of the thicknesses of the first adhesive layer and the second adhesive layer; and the thickness of the first transparent adhesive layer is equal to the thickness of the first buffer layer.

[0015] In the flexible display module provided in the embodiments of the present application, the thickness of the first protection layer is greater than the thickness of the first support layer, and the sum of the thicknesses of the first protection layer and the first buffer layer is greater than the thickness of the auxiliary support layer.

[0016] In the flexible display module provided in the embodiments of the present application, the flexible display module has a foldable area, the auxiliary support layer is provided with a hollow pattern corresponding to the foldable area, and in a direction perpendicular to a folding axis of the foldable area, the width range of the hollow pattern is less than or equal to the interval distance between adjacent two hollow patterns.

[0017] In the flexible display module provided in the embodiments of the present application, the interval distance between adjacent two hollow patterns is 2.4 to 5 times the width of the hollow pattern.

[0018] In the flexible display module provided in the embodiments of the present application, the flexible display module further has a non-foldable area located on at least one side of the foldable area; the foldable area comprises a first bending area and a second bending area located on at least one side of the first bending area, the hollow pattern is located in the first bending area, the second bending area is located between the first bending area and the non-foldable area, and the thickness of the auxiliary support layer in the second bending area is the same as the thickness of the auxiliary support layer in the non-foldable area.

[0019] In the flexible display module provided in the embodiments of the present application, the cover assembly comprises a second protection layer, a cover layer and a second transparent adhesive layer, the second protection layer is located on a side of the cover layer away from the display panel, and the second protection layer is attached to the cover layer through the second transparent adhesive layer;

[0020] In the thickness direction of the flexible display module, the thickness of the cover assembly is greater than the thickness of the support assembly.

[0021] In the flexible display module provided in an embodiment of the present application, the cover plate assembly also includes a third transparent adhesive layer, and the cover plate layer is adhered to the display panel through the third transparent adhesive layer. The sum of the thicknesses of the third transparent adhesive layer and the second transparent adhesive layer is 2 to 3 times the sum of the thicknesses of the first adhesive layer and the second adhesive layer.

[0022] In the flexible display module provided in the embodiment of the present application, the cover plate assembly further includes a third protective layer, a third transparent adhesive layer, and a fourth transparent adhesive layer. The third protective layer is located between the cover plate layer and the display panel. The cover plate layer is bonded to the third protective layer via the third transparent adhesive layer, and the third protective layer is bonded to the display panel via the fourth transparent adhesive layer.

[0023] The sum of the thicknesses of the second transparent adhesive layer, the third transparent adhesive layer, and the fourth transparent adhesive layer is 2 to 3 times the sum of the thicknesses of the first adhesive layer and the second adhesive layer.

[0024] In the flexible display module provided in the embodiment of the present application, the sum of the thicknesses of the cover layer and the second protective layer is greater than the thickness of the auxiliary supporting layer; the cover layer includes a first sublayer and a second sublayer covering the surface of the first sublayer;

[0025] The flexible display module has a foldable area, the first sub-layer is provided with a groove at a position corresponding to the foldable area, and the second sub-layer is filled in the groove.

[0026] In the flexible display module provided in an embodiment of the present application, the first sublayer is located on a side of the second sublayer away from the display panel, the material of the first sublayer includes ultra-thin glass, and the material of the second sublayer includes a high molecular polymer.

[0027] An embodiment of the present application further provides a foldable display device, which includes the flexible display module of one of the aforementioned embodiments.

[0028] The beneficial effects of the present application are as follows: in the flexible display module and foldable display device provided by the present application, the flexible display module includes a display panel, a cover assembly and a protective assembly arranged on the light-emitting side of the display panel, and a support assembly arranged on the back side of the display panel. In the thickness direction of the flexible display module, the vertical projection of the protective assembly is located within the vertical projection of the cover assembly, and the vertical projection area of ​​the protective assembly is smaller than the vertical projection area of ​​the cover assembly. The thickness of the glue in the protective assembly is greater than or equal to the thickness of the glue layer in the support assembly, and the thickness of the glue layer in the cover assembly is 2 to 3 times the thickness of the glue layer in the support assembly, so as to reduce the thickness of the glue layer in the support assembly and increase the thickness of the glue layer in the protective assembly and the cover assembly, and the protective assembly does not occupy the thickness of the entire machine. In this way, while ensuring the overall mechanical properties of the flexible display module, it is possible to reduce the thickness of the flexible display module, thereby achieving thinning and weight reduction of the flexible display module without sacrificing mechanical reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 The figure shows a cross-sectional structure diagram of a flexible display module.

[0031] Figure 2 A schematic cross-sectional structure diagram of a flexible display module provided in an embodiment of the present application.

[0032] Figure 3 for Figure 2 Schematic diagram of the detailed structure of the middle cover layer.

[0033] Figure 4 for Figure 2 Schematic diagram of the partial planar structure of the auxiliary support layer.

[0034] Figure 5 for Figure 2 Flexible display module and Figure 1 Schematic diagram of data comparison of the flexible display module during the falling ball and falling pen mechanical simulations.

[0035] Figure 6 This is another schematic cross-sectional structure diagram of the flexible display module provided in an embodiment of the present application.

[0036] Figure 7 for Figure 6 Flexible display module and Figure 1Data comparison schematic diagram of the middle flexible display module in drop ball and drop pen mechanical simulation. DETAILED DESCRIPTION

[0037] The following description of the embodiments refers to the accompanying drawings, which are used to exemplify specific embodiments that can be used to implement the present application. The directional terms mentioned in the present application, such as [up], [down], [front], [back], [left], [right], [inward], [outward], [side] and the like, are only the directions of the accompanying drawings. Therefore, the directional terms used are used to illustrate and understand the present application, not to limit the present application. In the drawings, similar structures are denoted by the same reference numerals. In the drawings, the thicknesses of some layers and regions are exaggerated for clear understanding and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily shown, but the present application is not limited thereto.

[0038] Please refer to Figure 1 , Figure 1 A cross-sectional structure schematic diagram of a flexible display module is shown, which includes a display panel 10', a cover plate assembly 20' disposed on the light-out side of the display panel 10', and a support assembly 40' disposed on the display panel 10' away from the cover plate assembly 20'. The cover plate assembly 20' includes a second protective layer 21', a cover plate layer 22', and a third transparent adhesive layer 23', the third transparent adhesive layer 23' is located on the side of the cover plate layer 22' close to the display panel 10', and the second protective layer 21' is located on the side of the cover plate layer 22' away from the display panel 10'. The cover plate assembly 20' further includes a third protective layer 25', a fourth transparent adhesive layer 26', and a second transparent adhesive layer 24', the third protective layer 25' is attached to the display panel 10' through the fourth transparent adhesive layer 26', the cover plate layer 22' is attached to the third protective layer 25' through the third transparent adhesive layer 23', and the second protective layer 21' is attached to the cover plate layer 22' through the second transparent adhesive layer 24'. The materials of the second protective layer 21' and the third protective layer 25' include PET, CPI, etc., and the material of the cover plate layer 22' includes UTG, etc.

[0039] The support assembly 40' includes a first support layer 41', a second support layer 45', and an auxiliary support layer 42', the first support layer 41' is attached to the display panel 10' through a first adhesive layer 43', the second support layer 45' is attached to the first support layer 41' through a second adhesive layer 44', and the auxiliary support layer 42' is attached to the second support layer 45' through a third adhesive layer 46'. The material of the first support layer 41' includes PET, etc., the material of the second support layer 45' includes PI, etc., and the material of the auxiliary support layer 42' includes SUS, etc.

[0040] The thickness of the second protective layer 21' is 53 microns, the thickness of the cover plate layer 22' is 30 microns, the thickness of the third protective layer 25' is 23 microns, the thickness of the third transparent adhesive layer 23' is 50 microns, the thickness of the fourth transparent adhesive layer 26' is 50 microns, the thickness of the second transparent adhesive layer 24' is 25 microns, the thickness of the first support layer 41' is 50 microns, the thickness of the second support layer 45' is 25 microns, the thickness of the auxiliary support layer 42' is 150 microns, the thickness of the first bonding adhesive layer 43' is 25 microns, the thickness of the second bonding adhesive layer 44' is 25 microns, the thickness of the third bonding adhesive layer 46' is 15 microns, and the total thickness of the support assembly 40', the display panel 10' and the cover plate assembly 20' on the flexible display module is 569 microns.

[0041] Please refer to Figures 1 to 5 , Figure 2 A cross-sectional structure schematic diagram of a flexible display module provided by the embodiment is shown in Figure 3 , Figure 2 A detailed structure schematic diagram of a cover plate layer in Figure 4 , Figure 2 A partial planar structure schematic diagram of an auxiliary support layer in Figure 5 , Figure 2 A flexible display module in Figure 1 A data comparison schematic diagram of the flexible display module in falling ball and pen mechanical simulation. Please refer to Figure 2 , the flexible display module 100 includes a display panel 10, a cover plate assembly 20 and a protection assembly 30 disposed on the light-emitting side of the display panel 10, and a support assembly 40 disposed on the side of the display panel 10 away from the cover plate assembly 20. The protection assembly 30 is disposed on the side of the cover plate assembly 20 away from the display panel 10. The display panel 10 includes a flexible organic light-emitting diode display panel 10 and the like, and when the display panel 10 is a flexible organic light-emitting diode display panel 10, the display panel 10 can include a substrate and a driving circuit layer, a light-emitting functional layer, an encapsulation layer and the like which are sequentially stacked on the substrate.

[0042] The vertical projection of the protection assembly 30 is located in the vertical projection of the cover assembly 20 in the thickness direction of the flexible display module 100, and the area of the vertical projection of the protection assembly 30 is smaller than the area of the vertical projection of the cover assembly 20. Specifically, the flexible display module 100 includes a display area AA and a frame area BA outside the display area AA. The protection assembly 30 is arranged corresponding to the display area AA and is not arranged in the frame area BA, and the cover assembly 20 is arranged in the display area AA and extends from the display area AA into the frame area BA, that is, the coverage range of the protection assembly 30 is smaller than the protection range of the cover assembly 20.

[0043] The cover assembly 20 is used to protect the display panel 10, the protection assembly 30 is used to protect the cover assembly 20 and the display panel 10, that is, the protection assembly 30 is used to protect the flexible display module 100. After the flexible display module 100 is assembled on the whole machine, the protection assembly 30 is located at the top of the whole machine to protect the module structure on the whole machine. Moreover, when the protection assembly 30 is damaged, the protection assembly 30 can be torn off and replaced on the whole machine, and the protection assembly 30 does not occupy the thickness of the module of the whole machine. The whole machine refers to a foldable display device formed after the flexible display module 100 is assembled in a shell.

[0044] The thickness of the adhesive in the protection assembly 30 is greater than the thickness of the adhesive layer in the support assembly 40, and the thickness of the adhesive layer in the cover assembly 20 is 2 to 3 times the thickness of the adhesive layer in the support assembly 40. By reducing the thickness of the adhesive layer in the support assembly 40 and increasing the thickness of the adhesive layer in the protection assembly 30 and the cover assembly 20, and the protection assembly 30 does not occupy the thickness of the whole machine, so as to provide the possibility of thinning and lightening of the flexible display module 100 while ensuring the overall mechanical properties of the flexible display module 100, thereby realizing the thinning and lightening of the flexible display module 100 without sacrificing the mechanical reliability.

[0045] Optionally, the protection assembly 30 includes a first protection layer 31, a first buffer layer 32, and a first transparent adhesive layer 33. The first buffer layer 32 is attached to the cover assembly 20 through the first transparent adhesive layer 33, and the first protection layer 31 is located on the side of the first buffer layer 32 away from the cover assembly 20. The material of the first protection layer 31 includes PET, etc., and the material of the first buffer layer 32 includes transparent elastic material, such as polystyrene, polypropylene, polycarbonate, rubber, and other non-Newtonian fluid materials. The material of the first transparent adhesive layer 33 includes OCA, etc.

[0046] The support assembly 40 comprises a first support layer 41, an auxiliary support layer 42, a first adhesive layer 43 and a second adhesive layer 44. The first support layer 41 is attached to the display panel 10 through the first adhesive layer 43. The auxiliary support layer 42 is located on the side of the first support layer 41 away from the display panel 10 and is attached to the first support layer 41 through the second adhesive layer 44. The material of the first support layer 41 comprises PET, etc. The material of the auxiliary support layer 42 comprises SUS, etc.

[0047] In the thickness direction of the flexible display module 100, the thickness of the protection assembly 30 is greater than or equal to the thickness of the support assembly 40. That is, the sum of the thicknesses of the film layers on the protection assembly 30 is greater than or equal to the sum of the thicknesses of the film layers on the support assembly 40, so as to increase the thickness of the protection assembly 30 and reduce the thickness of the support assembly 40.

[0048] Specifically, the thickness of the first transparent adhesive layer 33 is greater than the sum of the thicknesses of the first adhesive layer 43 and the second adhesive layer 44, so as to increase the thickness of the adhesive on the protection assembly 30 and reduce the thickness of the adhesive on the support assembly 40, thereby improving the mechanical properties of the flexible display module 100. The thickness of the adhesive on the protection assembly 30 refers to the sum of the thicknesses of all the adhesive layers on the protection assembly 30. Correspondingly, the thickness of the adhesive on the support assembly 40 refers to the sum of the thicknesses of all the adhesive layers on the support assembly 40. For example, in this embodiment, the thickness of the adhesive on the support assembly 40 is the sum of the thicknesses of the first adhesive layer 43 and the second adhesive layer 44.

[0049] Optionally, the thickness of the first transparent adhesive layer 33 ranges from 35 microns to 60 microns, for example, 50 microns. The thickness of the first adhesive layer 43 ranges from 10 microns to 20 microns, for example, 15 microns. The thickness of the second adhesive layer 44 ranges from 20 microns to 30 microns, for example, 25 microns.

[0050] Optionally, the thickness of the first transparent adhesive layer 33 is equal to the thickness of the first buffer layer 32. For example, the thickness of the first buffer layer 32 ranges from 40 microns to 60 microns, for example, 50 microns.

[0051] The thickness of the first protective layer 31 is greater than the thickness of the first support layer 41, and the sum of the thicknesses of the first protective layer 31 and the first buffer layer 32 is greater than the thickness of the auxiliary support layer 42, so as to increase the thickness of the protection assembly 30 and reduce the thickness of the support assembly 40, thereby increasing the modulus of the protection assembly 30, and further improving the mechanical properties of the flexible display module 100. Moreover, the protection assembly 30 does not occupy the thickness of the whole machine, so as to provide the possibility of thinning and lightening of the flexible display module 100 while ensuring the overall mechanical properties of the flexible display module 100, thereby realizing the thinning and lightening of the flexible display module 100 without sacrificing the mechanical reliability.

[0052] Optionally, the thickness of the first protective layer 31 ranges from 60 microns to 80 microns, for example, 70 microns. The thickness of the first support layer 41 ranges from 40 microns to 60 microns, for example, 50 microns. The thickness of the auxiliary support layer 42 ranges from 70 microns to 120 microns, for example, 80 microns.

[0053] In an embodiment, continuing to refer to Figure 2 The cover assembly 20 includes a second protective layer 21, a cover layer 22, and a second transparent adhesive layer 24. The second protective layer 21 is located on the side of the cover layer 22 away from the display panel 10. The second protective layer 21 is attached to the cover layer 22 through the second transparent adhesive layer 24. In the thickness direction of the flexible display module 100, the thickness of the cover assembly 20 is greater than the thickness of the support assembly 40. That is, the sum of the thicknesses of the respective film layers of the cover assembly 20 is greater than the sum of the thicknesses of the respective film layers of the support assembly 40, so as to increase the thickness of the cover assembly 20 and reduce the thickness of the support assembly 40.

[0054] Specifically, the cover assembly 20 further includes a third protective layer 25, a third transparent adhesive layer 23, and a fourth transparent adhesive layer 26. The third protective layer 25 is located between the cover layer 22 and the display panel 10. The cover layer 22 is attached to the third protective layer 25 through the third transparent adhesive layer 23. The third protective layer 25 is attached to the display panel 10 through the fourth transparent adhesive layer 26. The second protective layer 21 is attached to the cover layer 22 through the second transparent adhesive layer 24. The cover assembly 20 further includes a light-blocking layer 27 arranged on the side of the second protective layer 21 close to the display panel 10. The light-blocking layer 27 is located in the bezel area BA. The material of the light-blocking layer 27 includes black ink and the like.

[0055] The sum of the thicknesses of the second transparent adhesive layer 24, the third transparent adhesive layer 23 and the fourth transparent adhesive layer 26 is 2 to 3 times the sum of the thicknesses of the first bonding adhesive layer 43 and the second bonding adhesive layer 44, so as to increase the thickness of the adhesive on the cover plate assembly 20 and reduce the thickness of the adhesive on the support assembly 40, thereby improving the mechanical properties of the flexible display module 100. The thickness of the adhesive on the cover plate assembly 20 refers to the sum of the thicknesses of all adhesive layers on the cover plate assembly 20. For example, in the embodiment, the thickness of the adhesive on the cover plate assembly 20 refers to the sum of the thicknesses of the second transparent adhesive layer 24, the third transparent adhesive layer 23 and the fourth transparent adhesive layer 26 on the cover plate assembly 20.

[0056] Optionally, the third transparent adhesive layer 23, the fourth transparent adhesive layer 26 and the second transparent adhesive layer 24 are made of the same material as the first transparent adhesive layer 33, such as OCA. The thickness of the third transparent adhesive layer 23 ranges from 40 microns to 60 microns, such as 50 microns. The thickness of the fourth transparent adhesive layer 26 ranges from 20 microns to 30 microns, such as 25 microns. The thickness of the second transparent adhesive layer 24 ranges from 20 microns to 30 microns, such as 25 microns.

[0057] The sum of the thicknesses of the cover plate layer 22 and the second protective layer 21 is greater than the thickness of the auxiliary support layer 42, so as to reduce the thickness of the auxiliary support layer 42. The materials of the second protective layer 21 and the third protective layer 25 include PET, CPI, etc. The thickness of the second protective layer 21 ranges from 40 microns to 60 microns, such as 53 microns. The thickness of the third protective layer 25 ranges from 20 microns to 30 microns, such as 23 microns.

[0058] Referring to Figure 3 The cover plate layer 22 includes a first sub-layer 221 and a second sub-layer 222 covering the surface of the first sub-layer 221. The first sub-layer 221 is located on the side of the second sub-layer 222 away from the display panel 10. The material of the first sub-layer 221 includes ultra-thin glass, and the material of the second sub-layer 222 includes a high polymer.

[0059] Referring to Figure 2 and Figure 3The flexible display module 100 has a foldable area FD, the auxiliary support layer 42 is provided with a hollow pattern 420 corresponding to the foldable area FD. The foldable area FD includes a first bending area FD1 and a second bending area FD2 located at least one side of the first bending area FD1, the hollow pattern 420 is located in the first bending area FD1, the second bending area FD2 is located between the first bending area FD1 and the non-folding area NFD, the thickness of the auxiliary support layer 42 in the second bending area FD2 is the same as that in the non-folding area NFD. That is, the auxiliary support layer 42 located in the second bending area FD2 is not provided with a stress release structure such as a half-etched groove, and the structure of the auxiliary support layer 42 located in the second bending area FD2 is the same as that of the auxiliary support layer 42 located in the non-folding area NFD.

[0060] In combination with reference to Figure 2 And Figure 4 The flexible display module 100 has a foldable area FD, the auxiliary support layer 42 is provided with a hollow pattern 420 corresponding to the foldable area FD. The foldable area FD includes a first bending area FD1 and a second bending area FD2 located at least one side of the first bending area FD1, the hollow pattern 420 is located in the first bending area FD1, the second bending area FD2 is located between the first bending area FD1 and the non-folding area NFD, the thickness of the auxiliary support layer 42 in the second bending area FD2 is the same as that in the non-folding area NFD. That is, the auxiliary support layer 42 located in the second bending area FD2 is not provided with a stress release structure such as a half-etched groove, and the structure of the auxiliary support layer 42 located in the second bending area FD2 is the same as that of the auxiliary support layer 42 located in the non-folding area NFD.

[0061] The flexible display module 100 further includes a shielding piece 50 located on the side of the auxiliary support layer 42 away from the first support layer 41, the shielding piece 50 is provided corresponding to the foldable area FD, for shielding the hollow pattern 420, avoiding dust and other foreign matters from entering into the hollow pattern 420. The shielding piece 50 can be a tape or the like.

[0062] In a direction perpendicular to the folding axis PP' of the foldable region FD, the width of the hollow patterns 420 is less than or equal to the distance between two adjacent hollow patterns 420. For example, the distance between two adjacent hollow patterns 420 is 2.4 to 5 times the width of the hollow patterns 420. Optionally, the width of the hollow patterns 420 ranges from 50 microns to 250 microns, such as 100 microns; and the distance between two adjacent hollow patterns 420 ranges from 120 microns to 250 microns, such as 200 microns.

[0063] Compared to Figure 1 The flexible display module 100 shown in the figure removes the second supporting layer 45' and the third adhesive layer 46', and provides the cover layer 22 with a larger thickness and the auxiliary supporting layer 42 with a smaller thickness. The structure of the auxiliary supporting layer 42 in the foldable area FD is specially designed, and the fourth transparent adhesive layer 26 with a smaller thickness and the first adhesive layer 43 with a smaller thickness are provided. In addition, a protective component 30 is provided above the cover component 20, and a first buffer layer 32 is provided in the protective component 30 to increase the thickness of the protective component 30, thereby increasing the modulus of the protective component 30, and the protective component 30 does not occupy the thickness of the entire machine. In this way, while ensuring the overall mechanical properties of the flexible display module 100, the thickness of the flexible display module 100 can also be thinned, so that the sum of the thicknesses of the cover component 20, the display panel 10 and the support component 40 on the flexible display module 100 is in the range of 450 microns to 490 microns.

[0064] Reference Figure 5 , verified by the mechanics simulation of falling ball and falling pen Figure 2 The mechanical properties of the flexible display module 100 are shown in FIG. Figure 1 The flexible display module 100 'is used as a comparative example, and the Figure 2 For example, each layer of the flexible display module 100 has a fixed value, where: Figure 1The thickness of each layer of the flexible display module 100' is: the thickness of the second protective layer 21 is 53 microns, the thickness of the cover layer 22 is 30 microns, the thickness of the third protective layer 25 is 23 microns, the thickness of the third transparent adhesive layer 23 is 50 microns, the thickness of the fourth transparent adhesive layer 26 is 50 microns, the thickness of the second transparent adhesive layer 24 is 25 microns, the thickness of the first support layer 41 is 50 microns, the thickness of the second support layer is 25 microns, the thickness of the auxiliary support layer 42 is 150 microns, the thickness of the first bonding adhesive layer 43 is 25 microns, the thickness of the second bonding adhesive layer 44 is 25 microns, the thickness of the third bonding adhesive layer is 15 microns, and the total thickness of the support assembly 40, the display panel 10 and the cover assembly 20 on the flexible display module 100 is 569 microns; Figure 2 The thickness of each layer of the flexible display module 100 is: the thickness of the first protective layer 31 is 70 microns, the thickness of the first buffer layer 32 is 50 microns, the thickness of the first transparent adhesive layer 33 is 50 microns, the thickness of the second protective layer 21 is 53 microns, the thickness of the fourth transparent optical adhesive is 25 microns, the thickness of the cover layer 22 is 70 microns, the thickness of the third transparent adhesive layer 23 is 50 microns, the thickness of the second protective layer 21 is 23 microns, the thickness of the fourth transparent adhesive layer 26 is 25 microns, the thickness of the first bonding adhesive layer 43 is 15 microns, the thickness of the first support layer 41 is 50 microns, the thickness of the second bonding adhesive layer 44 is 25 microns, the thickness of the auxiliary support layer 42 is 80 microns, and the total thickness of the support assembly 40, the display panel 10 and the cover assembly 20 on the flexible display module 100 is 484 microns.

[0065] Respectively Figure 1 The flexible display module 100' and Figure 2 The flexible display module 100 of the example is subjected to pen drop and ball drop mechanical simulation analysis of screen body failure risk, and the simulation results are as shown in Figure 5 Wherein Figure 5 In (a), the ball drop mechanical simulation result is Figure 5 In (b), the pen drop mechanical simulation result is Figure 5 In (a), and Figure 5 In (b), the left side of the higher column corresponds to Figure 1 The flexible display module 100' of the example, and the right side of the lower column corresponds to Figure 2 The flexible display module 100 of the example. By comparing the pen drop and ball drop mechanical simulation of Figure 1 The flexible display module 100' and Figure 2 It can be seen from the screen body failure risk of the flexible display module 100 of the example that Figure 2 The ball drop risk of the flexible display module 100 of the example is compared withFigure 1 The flexible display module 100 ′ of the example is 21% lower. Figure 2 The risk of pen dropping of the flexible display module 100 is lower than that of Figure 1 The flexible display module 100' of the example is 55% lower. Figure 2 The exemplary flexible display module 100 has a reduced thickness and improved mechanical properties.

[0066] In one embodiment, referring to Figures 1 to 7 , Figure 6 This is another cross-sectional structural diagram of the flexible display module 100 provided in an embodiment of the present application. Figure 7 for Figure 6 Flexible display module 100 and Figure 1 Schematic diagram of data comparison of the flexible display module 100' during the ball drop and pen drop mechanics simulation. Figure 6 ,and Figure 2 The difference of the flexible display module 100 is that, compared with Figure 2 The flexible display module 100 of the example, Figure 6 The example flexible display module 100 removes the third protective layer 25 and the fourth transparent adhesive layer 26, and increases the thickness of the third transparent adhesive layer 23. The cover layer 22 is bonded to the display panel 10 via the third transparent adhesive layer 23. The sum of the thicknesses of the third transparent adhesive layer 23 and the second transparent adhesive layer 24 is 2 to 3 times the sum of the thicknesses of the first adhesive layer 43 and the second adhesive layer 44, thereby increasing the thickness of the adhesive on the cover assembly 20 and reducing the thickness of the adhesive on the support assembly 40, thereby improving the mechanical properties of the flexible display module 100. The thickness of the adhesive on the cover assembly 20 refers to the sum of the thicknesses of all adhesive layers on the cover assembly 20. For example, in this embodiment, the thickness of the adhesive on the cover assembly 20 refers to the sum of the thicknesses of the second transparent adhesive layer 24 and the third transparent adhesive layer 23 on the cover assembly 20.

[0067] Optionally, the thickness of the second transparent adhesive layer 24 ranges from 20 microns to 30 microns, for example, 25 microns; the thickness of the third transparent adhesive layer 23 ranges from 60 microns to 90 microns, for example, 75 microns, thereby further reducing the thickness of the flexible display module 100 while ensuring the mechanical properties of the flexible display module 100.

[0068] Compared to Figure 1The flexible display module 100' of the example, the flexible display module 100 of this embodiment removes the third protective layer 25', the fourth transparent adhesive layer 26', the second support layer 45' and the third adhesive layer 46', and sets the cover layer 22 with a larger thickness and the auxiliary support layer 42 with a smaller thickness, and specially designs the structure of the auxiliary support layer 42 in the foldable area FD, and sets the third transparent adhesive layer 23 with a larger thickness and the first adhesive layer 43 with a smaller thickness. In addition, a protective component 30 is set above the cover component 20, and a first buffer layer 32 is set in the protective component 30 to increase the thickness of the protective component 30, thereby increasing the modulus of the protective component 30, and the protective component 30 does not occupy the thickness of the entire machine. In this way, while ensuring the overall mechanical properties of the flexible display module 100, the thickness of the flexible display module 100 can also be thinned.

[0069] Reference Figure 7 , verified by the mechanics simulation of falling ball and falling pen Figure 6 The mechanical properties of the flexible display module 100 are shown in FIG. Figure 1 The flexible display module 100 'is used as a comparative example, and the Figure 6 For example, each layer of the flexible display module 100 has a fixed value, wherein: Figure 1 The thickness of each layer of the flexible display module 100' is as follows: the thickness of the second protective layer 21 is 53 microns, the thickness of the cover layer 22 is 30 microns, the thickness of the third protective layer 25 is 23 microns, the thickness of the third transparent adhesive layer 23 is 50 microns, the thickness of the fourth transparent adhesive layer 26 is 50 microns, the thickness of the second transparent adhesive layer 24 is 25 microns, the thickness of the first supporting layer 41 is 50 microns, the thickness of the second supporting layer is 25 microns, the thickness of the auxiliary supporting layer 42 is 150 microns, the thickness of the first adhesive layer 43 is 25 microns, the thickness of the second adhesive layer 44 is 25 microns, and the thickness of the third adhesive layer is 15 microns. The total thickness of the support assembly 40, the display panel 10, and the cover assembly 20 on the flexible display module 100 is 569 microns. Figure 6The thicknesses of the layers of the flexible display module 100 are as follows: the thickness of the first protective layer 31 is 70 microns, the thickness of the first buffer layer 32 is 50 microns, the thickness of the first transparent adhesive layer 33 is 50 microns, the thickness of the second protective layer 21 is 53 microns, the thickness of the fourth transparent optical adhesive is 25 microns, the thickness of the cover layer 22 is 70 microns, the thickness of the third transparent adhesive layer 23 is 75 microns, the thickness of the first bonding adhesive layer 43 is 15 microns, the thickness of the first support layer 41 is 50 microns, the thickness of the second bonding adhesive layer 44 is 25 microns, the thickness of the auxiliary support layer 42 is 80 microns, and the total thickness of the support assembly 40, the display panel 10, and the cover assembly 20 on the flexible display module 100 is 461 microns.

[0070] respectively Figure 1 the flexible display module 100' and Figure 6 The pen drop and ball drop mechanical simulation analysis of the screen failure risk of the example flexible display module 100 is shown in FIG. 13, and the simulation results are as follows: Figure 7 wherein Figure 7 (a) is the ball drop mechanical simulation result, Figure 7 (b) is the pen drop mechanical simulation result, Figure 7 (a) and Figure 7 (b) of FIG. 13, the left high column corresponds to Figure 1 the example flexible display module 100', and the right low column corresponds to Figure 6 the example flexible display module 100. By comparing the pen drop and ball drop mechanical simulation of the Figure 1 the flexible display module 100' and Figure 6 the screen failure risk of the example flexible display module 100 can be known, Figure 6 the ball drop risk of the example flexible display module 100 is 23% lower than that of Figure 1 the example flexible display module 100', Figure 6 the pen drop risk of the example flexible display module 100 is 52% lower than that of Figure 1 the example flexible display module 100'. Therefore, it can be known that Figure 6 the example flexible display module 100 not only reduces the thickness, but also improves the mechanical performance of the flexible display module 100.

[0071] Based on the same inventive concept, the embodiments of the present application also provide a foldable display device. The foldable display device includes a housing and the flexible display module 100 of any one of the foregoing embodiments, and the flexible display module 100 is assembled in the housing. The foldable display device includes foldable mobile phones, tablets, and other electronic display products.

[0072] According to the above embodiments, it can be known that

[0073] The application provides a flexible display module and a foldable display device, the flexible display module comprises a display panel, a cover plate assembly and a protection assembly arranged on the light-emitting side of the display panel, and a support assembly arranged on the back side of the display panel, the vertical projection of the protection assembly is located in the vertical projection of the cover plate assembly, the vertical projection area of the protection assembly is smaller than the vertical projection area of the cover plate assembly, the thickness of the glue material in the protection assembly is greater than the thickness of the glue layer in the support assembly, and the thickness of the glue layer in the cover plate assembly is 2-3 times the thickness of the glue layer in the support assembly, so as to reduce the thickness of the glue layer in the support assembly, increase the thickness of the glue layer in the protection assembly and the cover plate assembly, and the protection assembly does not occupy the thickness of the whole machine, so that the thinning and lightening of the flexible display module are possible under the condition of ensuring the overall mechanical performance of the flexible display module, thereby realizing the thinning and lightening of the flexible display module without sacrificing the mechanical reliability.

[0074] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0075] The above describes the embodiments of the application in detail, and the principle and implementation mode of the application are described by applying specific examples; the above embodiment description is only used to help understand the technical solutions and core ideas of the 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 application.

Claims

1. A flexible display module, characterized in that: include: Display panel; A cover plate assembly is provided on the light-emitting side of the display panel; the cover plate assembly comprises a second protective layer, a second transparent adhesive layer and a cover plate layer; A protective component is provided on a side of the cover plate component away from the display panel; the protective component comprises a first protective layer, a first buffer layer and a first transparent adhesive layer; A support assembly is provided on a side of the display panel away from the cover assembly; the support assembly comprises an auxiliary support layer, a second adhesive layer, a first support layer, and a first adhesive layer; In which, in the thickness direction of the flexible display module, the vertical projection of the protective component is located within the vertical projection of the cover component, the thickness of the glue in the protective component is greater than the thickness of the glue layer in the supporting component, and the thickness of the glue layer in the cover component is 2 to 3 times the thickness of the glue layer in the supporting component.

2. The flexible display module according to claim 1, wherein: The first buffer layer is attached to the cover assembly via the first transparent adhesive layer, and the first protective layer is located on a side of the first buffer layer away from the cover assembly; The first supporting layer is bonded to the display panel via the first adhesive layer, and the auxiliary supporting layer is located on a side of the first supporting layer away from the display panel and is bonded to the first supporting layer via the second adhesive layer; Wherein, in the thickness direction of the flexible display module, the thickness of the protection component is greater than or equal to the thickness of the support component.

3. The flexible display module according to claim 2, wherein: The thickness of the first transparent adhesive layer is greater than the sum of the thicknesses of the first adhesive layer and the second adhesive layer; the thickness of the first transparent adhesive layer is equal to the thickness of the first buffer layer.

4. The flexible display module according to claim 3, wherein: The thickness of the first protection layer is greater than the thickness of the first supporting layer, and the sum of the thicknesses of the first protection layer and the first buffer layer is greater than the thickness of the auxiliary supporting layer.

5. The flexible display module according to claim 4, wherein: The flexible display module has a foldable area, and the auxiliary supporting layer is provided with a hollow pattern corresponding to the foldable area. In the direction perpendicular to the folding axis of the foldable area, the width range of the hollow pattern is less than or equal to the spacing distance between two adjacent hollow patterns.

6. The flexible display module according to claim 5, characterized in that: The spacing distance between two adjacent hollow patterns is 2.4 to 5 times the width of the hollow pattern.

7. The flexible display module according to claim 5, characterized in that: The flexible display module also has a non-folding area located on at least one side of the foldable area; the foldable area includes a first bending area and a second bending area located on at least one side of the first bending area, the hollow pattern is located in the first bending area, the second bending area is located between the first bending area and the non-folding area, and the thickness of the auxiliary support layer in the second bending area is the same as the thickness in the non-folding area.

8. The flexible display module according to any one of claims 2 to 7, wherein: The second protective layer is located on a side of the cover layer away from the display panel, and the second protective layer is adhered to the cover layer via the second transparent adhesive layer; Wherein, in the thickness direction of the flexible display module, the thickness of the cover assembly is greater than the thickness of the support assembly.

9. The flexible display module according to claim 8, wherein: The cover plate assembly also includes a third transparent adhesive layer, and the cover plate layer is adhered to the display panel through the third transparent adhesive layer. The sum of the thicknesses of the third transparent adhesive layer and the second transparent adhesive layer is 2 to 3 times the sum of the thicknesses of the first adhesive layer and the second adhesive layer.

10. The flexible display module according to claim 8, wherein: The cover plate assembly further includes a third protective layer, a third transparent adhesive layer, and a fourth transparent adhesive layer. The third protective layer is located between the cover plate layer and the display panel. The cover plate layer is bonded to the third protective layer via the third transparent adhesive layer. The third protective layer is bonded to the display panel via the fourth transparent adhesive layer. The sum of the thicknesses of the second transparent adhesive layer, the third transparent adhesive layer, and the fourth transparent adhesive layer is 2 to 3 times the sum of the thicknesses of the first adhesive layer and the second adhesive layer.

11. The flexible display module according to claim 8, wherein: The sum of the thicknesses of the cover layer and the second protective layer is greater than the thickness of the auxiliary support layer; the cover layer includes a first sublayer and a second sublayer covering the surface of the first sublayer; The flexible display module has a foldable area, the first sub-layer is provided with a groove at a position corresponding to the foldable area, and the second sub-layer is filled in the groove.

12. The flexible display module according to claim 11, wherein: The first sublayer is located on a side of the second sublayer away from the display panel. The material of the first sublayer includes ultra-thin glass, and the material of the second sublayer includes a high molecular polymer.

13. A foldable display device, characterized in that: The flexible display module comprises the flexible display module as claimed in any one of claims 1 to 12.

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