Flexible display module and foldable display device

Abstract

The invention provides a flexible display module and a foldable display device.The flexible display module comprises a display panel, a cover plate assembly, a protection assembly and a supporting assembly, the cover plate assembly and the protection assembly are arranged on the light emitting side of the display panel, and the supporting assembly is arranged on the back side of the display panel; the vertical orthographic projection of the protection assembly is located in the vertical orthographic projection of the cover plate assembly, the area of the vertical orthographic projection of the protection assembly is smaller than that of the vertical orthographic projection of the cover plate assembly, the thickness of a rubber material in the protection assembly is larger than that of a rubber layer in the supporting assembly, and the thickness of the rubber layer in the cover plate assembly is 2-3 times that of the rubber layer in the supporting assembly. The thickness of the adhesive layer in the supporting assembly is reduced, the thickness of the adhesive layer in the protection assembly and the thickness of the adhesive layer in the cover plate assembly are increased, and thinning and weight reduction of the flexible display module are achieved on the premise that mechanical reliability is not sacrificed.

Description

Technical Field

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

[0002] At present, the main trend of foldable display products is to reduce the thickness and weight. Therefore, it is necessary to simplify the stacking design of the flexible display module of the foldable display product to achieve the thinning and weight reduction of the flexible display module. For example, by reducing the thickness of the film layer or glue layer on the flexible display module, the thickness of the flexible display module can be reduced, but at the same time, the mechanical reliability of the flexible display module will be sacrificed. Therefore, it is necessary to propose an optimized design of the flexible display module to achieve the thinning and weight reduction of the flexible display module without sacrificing mechanical reliability. Summary of the invention

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

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

[0005] The embodiment of the present application provides a flexible display module, which includes:

[0006] Display panel;

[0007] A cover plate assembly, arranged on the light-emitting side of the display panel;

[0008] A protection component, disposed on a side of the cover plate component away from the display panel;

[0009] A support assembly, disposed on a side of the display panel away from the cover assembly;

[0010] Among them, in the thickness direction of the flexible display module, the vertical orthographic projection of the protection component is located within the vertical orthographic projection of the cover component, and the vertical orthographic projection area of ​​the protection component is smaller than the vertical orthographic projection area of ​​the cover component, the thickness of the glue in the protection component is greater than or equal to 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.

[0011] In the flexible display module provided in the embodiment of the present application, the protection component includes a first protection layer, a first buffer layer and a first transparent adhesive layer, the first buffer layer is attached to the cover plate component through the first transparent adhesive layer, and the first protection layer is located on a side of the first buffer layer away from the cover plate component;

[0012] The support assembly includes a first support layer, an auxiliary support layer, a first adhesive layer and a second adhesive layer, the first support layer is bonded 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 bonded to the first support layer through the second adhesive layer;

[0013] 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.

[0014] In the flexible display module provided in the embodiment 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; 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 embodiment of the present application, the thickness of the first protective layer is greater than the thickness of the first supporting layer, and the sum of the thicknesses of the first protective layer and the first buffer layer is greater than the thickness of the auxiliary supporting layer.

[0016] In the flexible display module provided in an embodiment of the present application, 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.

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

[0018] In the flexible display module provided in an embodiment of the present application, 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 supporting layer in the second bending area is the same as the thickness in the non-folding area.

[0019] In the flexible display module provided in the embodiment of the present application, the cover plate assembly includes a second protective layer, a cover plate layer and a second transparent adhesive layer, the second protective layer is located on a side of the cover plate layer away from the display panel, and the second protective layer is bonded to the cover plate layer through the second transparent adhesive layer;

[0020] 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.

[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, the cover plate layer is bonded to the display panel through the third transparent adhesive layer, and 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 through the third transparent adhesive layer, and the third protective layer is bonded to the display panel through 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 thickness 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;

[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 the 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 also 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 orthographic projection of the protective assembly is located within the vertical orthographic projection of the cover assembly, and the vertical orthographic projection area of ​​the protective assembly is smaller than the vertical orthographic 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 the 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 A cross-sectional structural diagram of a flexible display module is shown.

[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 plan 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 ball-falling and pen-falling mechanical simulations.

[0035] Figure 6 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 1Schematic diagram of data comparison of the flexible display module during the ball-falling and pen-falling mechanical simulations. DETAILED DESCRIPTION

[0037] The description of the following embodiments is with reference to the attached diagrams to illustrate specific embodiments that the present application can be implemented. The directional terms mentioned in the present application, such as [up], [down], [front], [back], [left], [right], [inside], [outside], [side], etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present application, rather than to limit the present application. In the figures, units with similar structures are represented by the same reference numerals. In the accompanying drawings, the thickness of some layers and regions is 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 to this.

[0038] Please refer to Figure 1 , Figure 1 A cross-sectional structural diagram of a flexible display module is shown, and the flexible display module includes a display panel 10', a cover plate assembly 20' disposed on the light-emitting 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', wherein the third transparent adhesive layer 23' is located on a side of the cover plate layer 22' close to the display panel 10', and the second protective layer 21' is located on a 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', wherein the third protective layer 25' is bonded to the display panel 10' via the fourth transparent adhesive layer 26', the cover plate layer 22' is bonded to the third protective layer 25' via the third transparent adhesive layer 23', and the second protective layer 21' is bonded to the cover plate layer 22' via 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', wherein the first support layer 41' is bonded to the display panel 10' via a first adhesive layer 43', the second support layer 45' is bonded to the first support layer 41' via a second adhesive layer 44', and the auxiliary support layer 42' is bonded to the second support layer 45' via a third adhesive layer 46'. The material of the first support layer 41' includes PET, the material of the second support layer 45' includes PI, and the material of the auxiliary support layer 42' includes SUS, etc.

[0040] Among them, 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 45' 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, the thickness of the third adhesive layer 46' is 15 microns, and the total thickness of the supporting assembly 40', the display panel 10' and the cover assembly 20' on the flexible display module is 569 microns.

[0041] Please refer to Figures 1 to 5 , Figure 2 A schematic cross-sectional structure diagram of a flexible display module provided in an embodiment of the present application, Figure 3 for Figure 2 Detailed structural diagram of the middle cover layer. Figure 4 for Figure 2 Schematic diagram of the partial plane structure of the auxiliary support layer. Figure 5 for Figure 2 Flexible display module and Figure 1 Schematic diagram of data comparison of the flexible display module in the ball-dropping and pen-dropping mechanical simulation. Figure 2 The flexible display module 100 includes a display panel 10, a cover 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 a side of the display panel 10 away from the cover assembly 20. The protection assembly 30 is disposed on a side of the cover assembly 20 away from the display panel 10. The display panel 10 includes a flexible organic light-emitting diode display panel 10, etc. When the display panel 10 is a flexible organic light-emitting diode display panel 10, the display panel 10 may include a substrate and a driving circuit layer, a light-emitting function layer, and an encapsulation layer, etc., which are sequentially stacked on the substrate.

[0042] Among them, in the thickness direction of the flexible display module 100, the vertical orthographic projection of the protection component 30 is located within the vertical orthographic projection of the cover assembly 20, and the vertical orthographic projection area of ​​the protection component 30 is smaller than the vertical orthographic projection area of ​​the cover assembly 20. Specifically, the flexible display module 100 includes a display area AA and a frame area BA located outside the display area AA. The protection component 30 is arranged corresponding to the display area AA and is not arranged in the frame area BA, while the cover assembly 20 is located in the display area AA and extends from the display area AA to the frame area BA, that is, the coverage range of the protection component 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, and 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 to 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, it can be torn off from the whole machine and replaced with a new protection assembly 30, and the protection assembly 30 does not occupy the thickness of the whole machine module. Among them, the whole machine refers to a foldable display device formed after the flexible display module 100 is assembled to a shell, etc.

[0044] The thickness of the adhesive material in the protection component 30 is greater than the thickness of the adhesive layer in the support component 40, and the thickness of the adhesive layer in the cover component 20 is 2 to 3 times the thickness of the adhesive layer in the support component 40. The thickness of the adhesive layer in the support component 40 is reduced, and the thickness of the adhesive layer in the protection component 30 and the cover component 20 is increased, and the protection component 30 does not occupy the thickness of the whole machine. In this way, while ensuring the overall mechanical properties of the flexible display module 100, it is possible to reduce the thickness and weight of the flexible display module 100, thereby achieving the thinning and weight reduction of the flexible display module 100 without sacrificing mechanical reliability.

[0045] Optionally, the protection component 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., the material of the first buffer layer 32 includes a 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 includes 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 bonded to the display panel 10 via the first adhesive layer 43. The auxiliary support layer 42 is located on a side of the first support layer 41 away from the display panel 10. The auxiliary support layer 42 is bonded to the first support layer 41 via the second adhesive layer 44. The material of the first support layer 41 includes PET, etc., and the material of the auxiliary support layer 42 includes SUS, etc.

[0047] In the thickness direction of the flexible display module 100, the thickness of the protection component 30 is greater than or equal to the thickness of the support component 40. That is, the sum of the thicknesses of the film layers on the protection component 30 is greater than or equal to the sum of the thicknesses of the film layers on the support component 40, so as to increase the thickness of the protection component 30 and reduce the thickness of the support component 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 material on the protection component 30 and reduce the thickness of the adhesive material on the support component 40, thereby improving the mechanical properties of the flexible display module 100. The thickness of the adhesive material on the protection component 30 refers to the sum of the thicknesses of all adhesive layers on the protection component 30; correspondingly, the thickness of the adhesive material on the support component 40 refers to the sum of the thicknesses of all adhesive layers on the support component 40. For example, in this embodiment, the thickness of the adhesive material on the support component 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 is in a range of 40 micrometers to 60 micrometers, for example, 50 micrometers.

[0051] The thickness of the first protective layer 31 is greater than the thickness of the first supporting 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 supporting layer 42, so as to increase the thickness of the protective component 30 and reduce the thickness of the supporting component 40, thereby increasing the modulus of the protective component 30, and further improving the mechanical properties of the flexible display module 100, 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, it is possible to reduce the thickness of the flexible display module 100, thereby achieving the thinning and weight reduction of the flexible display module 100 without sacrificing mechanical reliability.

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

[0053] In one embodiment, continue to refer to Figure 2 , the cover plate assembly 20 includes a second protective layer 21, a cover plate layer 22 and a second transparent adhesive layer 24, wherein the second protective layer 21 is located on a side of the cover plate layer 22 away from the display panel 10. The second protective layer 21 is bonded to the cover plate layer 22 via the second transparent adhesive layer 24. Wherein, in the thickness direction of the flexible display module 100, the thickness of the cover plate assembly 20 is greater than the thickness of the support assembly 40. That is, the sum of the thicknesses of the various film layers on the cover plate assembly 20 is greater than the sum of the thicknesses of the various film layers on the support assembly 40, so as to increase the thickness of the cover plate assembly 20 and reduce the thickness of the support assembly 40.

[0054] Specifically, the cover plate 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 plate layer 22 and the display panel 10. The cover plate layer 22 is bonded to the third protective layer 25 through the third transparent adhesive layer 23, and the third protective layer 25 is bonded to the display panel 10 through the fourth transparent adhesive layer 26. The second protective layer 21 is bonded to the cover plate layer 22 through the second transparent adhesive layer 24. The cover plate assembly 20 further includes a light shielding layer 27 disposed on a side of the second protective layer 21 close to the display panel 10. The light shielding layer 27 is located in the frame area BA, and the material of the light shielding layer 27 includes black ink, etc.

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

[0056] Optionally, the materials of the third transparent adhesive layer 23, the fourth transparent adhesive layer 26 and the second transparent adhesive layer 24 are the same as those of the first transparent adhesive layer 33, for example, all are OCA. The thickness of the third transparent adhesive layer 23 is in the range of 40 microns to 60 microns, for example, 50 microns. The thickness of the fourth transparent adhesive layer 26 is in the range of 20 microns to 30 microns, for example, 25 microns. The thickness of the second transparent adhesive layer 24 is in the range of 20 microns to 30 microns, for example, 25 microns.

[0057] The sum of the thickness of the cover 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] Reference Figure 3 The cover layer 22 includes a first sublayer 221 and a second sublayer 222 covering the surface of the first sublayer 221. The first sublayer 221 is located on a side of the second sublayer 222 away from the display panel 10. The material of the first sublayer 221 includes ultra-thin glass, and the material of the second sublayer 222 includes a high molecular polymer.

[0059] Reference Figure 2 and Figure 3, the flexible display module 100 has a foldable area FD, the foldable area FD is located in the display area AA, and the display area AA also includes a non-folding area NFD located on at least one side of the foldable area FD, and the flexible display module 100 can be folded along the folding axis P-P' of the foldable area FD. The first sub-layer 221 is provided with a groove 2211 at a position corresponding to the foldable area FD, and the second sub-layer 222 is filled in the groove 2211. The thickness of the first sub-layer 221 ranges from 60 microns to 100 microns, for example, 70 microns. The thickness of the first sub-layer 221 at the position where the groove 2211 is provided ranges from 30 microns to 50 microns, for example, 30 microns. Wherein, the second sub-layer 222 is coated on the surface of the first sub-layer 221 on the side where the groove 2211 is provided and on the side of the first sub-layer 221 to protect the first sub-layer 221. Moreover, the thickness of the second sub-layer 222 is relatively small, and the thickness of the cover layer 22 can be represented by the thickness of the first sub-layer 221 .

[0060] Combined with reference Figure 2 and Figure 4 , the flexible display module 100 has a foldable area FD, and 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 on 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, and the thickness of the auxiliary support layer 42 in the second bending area FD2 is the same as the thickness 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-engraved groove, and the structure of the auxiliary support layer 42 located in the second bending area FD2 is the same as the structure of the auxiliary support layer 42 located in the non-folding area NFD.

[0061] The flexible display module 100 further includes a shielding member 50 located on a side of the auxiliary support layer 42 away from the first support layer 41, and the shielding member 50 is disposed corresponding to the foldable region FD to shield the hollow pattern 420 to prevent dust and other foreign matter from entering the hollow pattern 420. The shielding member 50 may 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 pattern 420 is less than or equal to the spacing distance between two adjacent hollow patterns 420. For example, the spacing distance between two adjacent hollow patterns 420 is 2.4 to 5 times the width of the hollow pattern 420. Optionally, the width of the hollow pattern 420 ranges from 50 microns to 250 microns, such as 100 microns; the spacing 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, the flexible display module 100 of this embodiment removes the second supporting layer 45' and the third adhesive layer 46', and sets the cover layer 22 with a larger thickness and the auxiliary supporting layer 42 with a smaller thickness, and specially designs the structure of the auxiliary supporting layer 42 in the foldable area FD, and sets the fourth transparent adhesive layer 26 with a smaller 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, so that the sum of the thicknesses of the cover component 20, the display panel 10 and the supporting component 40 on the flexible display module 100 ranges from 450 microns to 490 microns.

[0064] Reference Figure 5 , verified by simulation of falling ball and falling pen mechanics 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. Figure 2 Taking the example of a fixed value of each layer of the flexible display module 100 as an example, Figure 1The 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, the thickness of the third 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 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 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 adhesive layer 43 is 15 microns, the thickness of the first supporting layer 41 is 50 microns, the thickness of the second adhesive layer 44 is 25 microns, and the thickness of the auxiliary supporting layer 42 is 80 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 484 microns.

[0065] Compare 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 to analyze the risk of screen failure. The simulation results are as follows: Figure 5 As shown, Figure 5 (a) is the simulation result of falling ball mechanics. Figure 5 (b) is the result of the pen-falling mechanics simulation. Figure 5 (a) and Figure 5 The taller column on the left side of (b) corresponds to Figure 1 In the flexible display module 100 ′ of the example, the lower column on the right corresponds to Figure 2 The flexible display module 100 of the example. Comparison of pen drop and ball drop mechanical simulation Figure 1 The flexible display module 100 ′ and Figure 2 It can be seen that the risk of screen failure of the flexible display module 100 of the example is: Figure 2 The risk of falling ball of the flexible display module 100 is compared with Figure 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 example flexible display module 100' is 55% lower. Figure 2 The flexible display module 100 of the example has a reduced thickness and improved mechanical properties.

[0066] In one embodiment, referring to Figures 1 to 7 , Figure 6 Another cross-sectional structural diagram of the flexible display module 100 provided in an embodiment of the present application is shown in FIG. Figure 7 for Figure 6 Flexible display module 100 and Figure 1 Figure 1 is a schematic diagram showing the data comparison of the flexible display module 100' during the ball drop and pen drop mechanical 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 third protective layer 25 and the fourth transparent adhesive layer 26 are removed from the example flexible display module 100, and the thickness of the third transparent adhesive layer 23 is increased. The cover layer 22 is bonded to the display panel 10 through the third transparent adhesive layer 23, and the sum of the thickness of the third transparent adhesive layer 23 and the second transparent adhesive layer 24 is 2 to 3 times the sum of the thickness of the first adhesive layer 43 and the second adhesive layer 44, so as to increase the thickness of the adhesive material on the cover assembly 20 and reduce the thickness of the adhesive material on the support assembly 40, thereby improving the mechanical properties of the flexible display module 100. Among them, the thickness of the adhesive material on the cover assembly 20 refers to the sum of the thickness of all adhesive layers on the cover assembly 20. For example, in this embodiment, the thickness of the adhesive material on the cover assembly 20 refers to the sum of the thickness 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 is in a range of 20 microns to 30 microns, such as 25 microns; the thickness of the third transparent adhesive layer 23 is in a range of 60 microns to 90 microns, such as 75 microns, so that the thickness of the flexible display module 100 can be further reduced 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 glue 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 the structure of the auxiliary support layer 42 in the foldable area FD is specially designed, and the third transparent glue layer 23 with a larger thickness and the first adhesive layer 43 with a smaller thickness are set at the same time. 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, the thickness of the flexible display module 100 can be reduced while ensuring the overall mechanical properties of the flexible display module 100.

[0069] Reference Figure 7 , verified by simulation of falling ball and falling pen mechanics 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. Figure 6 The flexible display module 100 of the example has a fixed value for each layer as an example, 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, the thickness of the third 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 6The 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 75 microns, the thickness of the first adhesive layer 43 is 15 microns, the thickness of the first supporting layer 41 is 50 microns, the thickness of the second adhesive layer 44 is 25 microns, and the thickness of the auxiliary supporting layer 42 is 80 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 461 microns.

[0070] Compare Figure 1 The flexible display module 100 ′ and Figure 6 The flexible display module 100 of the example is subjected to pen drop and ball drop mechanical simulation to analyze the risk of screen failure. The simulation results are as follows: Figure 7 As shown, Figure 7 (a) is the simulation result of falling ball mechanics. Figure 7 (b) is the result of the pen-falling mechanics simulation. Figure 7 (a) and Figure 7 The taller column on the left side of (b) corresponds to Figure 1 In the flexible display module 100 ′ of the example, the lower column on the right corresponds to Figure 6 The flexible display module 100 of the example. Comparison of pen drop and ball drop mechanical simulation Figure 1 The flexible display module 100 ′ and Figure 6 It can be seen that the risk of screen failure of the flexible display module 100 of the example is: Figure 6 The risk of falling ball of the flexible display module 100 is compared with Figure 1 The example flexible display module 100' is 23% lower. Figure 6 The risk of pen dropping of the flexible display module 100 is lower than that of Figure 1 The example flexible display module 100' is 52% lower. Figure 6 The flexible display module 100 of the example has a reduced thickness and improved mechanical properties.

[0071] Based on the same inventive concept, the embodiment of the present application also provides a foldable display device, which includes a housing and a flexible display module 100 of one of the above embodiments, and the flexible display module 100 is assembled in the housing. The foldable display device includes electronic display products such as foldable mobile phones and tablets.

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

[0073] The present application provides a flexible display module and a foldable display device, wherein the flexible display module includes a display panel, a cover plate 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, wherein the vertical projection of the protective assembly is located within the vertical projection of the cover plate assembly, and the vertical projection area of ​​the protective assembly is smaller than the vertical projection area of ​​the cover plate assembly, the thickness of the adhesive in the protective 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, so as to reduce the thickness of the adhesive layer in the support assembly and increase the thickness of the adhesive layer in the protective assembly and the cover plate assembly, and the protective assembly does not occupy the thickness of the entire machine, thereby providing the possibility of reducing the thickness of the flexible display module while ensuring the overall mechanical properties of the flexible display module, thereby achieving the thinning and weight reduction of the flexible display module without sacrificing mechanical reliability.

[0074] 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.

[0075] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A flexible display module, characterized in that: include: Display panel; A cover plate assembly, arranged on the light-emitting side of the display panel; A protection component, disposed on a side of the cover plate component away from the display panel; A support assembly, disposed on a side of the display panel away from the cover assembly; Among them, in the thickness direction of the flexible display module, the vertical projection of the protection component is located within the vertical projection of the cover component, the thickness of the glue in the protection component is greater than the thickness of the glue layer in the support 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 support component.

2. The flexible display module according to claim 1, characterized in that: The protection assembly includes a first protection layer, a first buffer layer and a first transparent adhesive layer, the first buffer layer is attached to the cover assembly via the first transparent adhesive layer, and the first protection layer is located on a side of the first buffer layer away from the cover assembly; The support assembly includes a first support layer, an auxiliary support layer, a first adhesive layer and a second adhesive layer, the first support layer is bonded 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 bonded to the first support layer through 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, characterized in that: The thickness of the first transparent adhesive layer is greater than the sum of the thickness 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, characterized in that: The thickness of the first protection layer is greater than the thickness of the first support layer, and the sum of the thickness of the first protection layer and the first buffer layer is greater than the thickness of the auxiliary support layer.

5. The flexible display module according to claim 4, characterized in that: 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 a direction perpendicular to a folding axis of the foldable area, a width range of the hollow pattern is less than or equal to a 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 supporting 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, characterized in that: The cover plate assembly comprises a second protective layer, a cover plate layer and a second transparent adhesive layer, wherein the second protective layer is located on a side of the cover plate layer away from the display panel, and the second protective layer is attached to the cover plate 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, characterized in that: The cover plate assembly also includes a third transparent adhesive layer, and the cover plate layer is bonded 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, characterized in that: The cover plate assembly further includes a third protective layer, a third transparent adhesive layer and a fourth transparent adhesive layer, wherein 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; 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, characterized in that: The sum of the thickness 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, characterized in that: 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 high molecular polymer.

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

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