Flexible display modules and electronic devices

Abstract

The present disclosure relates to the field of display technology, and more specifically, to a flexible display module and an electronic device. The flexible display module is capable of curling, and may include: a flexible display panel having a display side and a back side arranged opposite to each other in the thickness direction thereof; a first functional film layer formed on the display side of the flexible display panel; a second functional film layer formed on the back side of the flexible display panel; wherein the ratio of the thickness of the second functional film layer to the thickness of the first functional film layer is 0.5 to 1.5, and the ratio of the elastic modulus of the second functional film layer to the elastic modulus of the first functional film layer is 0.5 to 1.5. The flexible display module of this solution is not prone to peeling and failure.

Description

Technical Field

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

[0002] With the development of OLED (Organic Light Emission Diode) display technology in recent years, products and research related to curved, foldable and other flexible display panels have received more and more attention.

[0003] At present, flexible display modules have multiple film layers, and the multiple film layers are bonded together by glue. However, during the curling process, staggered layers will occur between the film layers, which is the strain accumulation phenomenon. Among them, the thicker the curling module and the more curling circles, the more serious the strain accumulation of the film layer. The strain accumulation in the curling process is mainly absorbed by the glue material. If the strain accumulation reaches the limit value, peeling will occur, and the key layers of the module (for example: inorganic packaging layer, backplane, etc.) are prone to breakage and failure.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The purpose of the present disclosure is to provide a flexible display module and an electronic device, thereby overcoming one or more problems caused by limitations and defects of related technologies at least to a certain extent.

[0006] A first aspect of the present disclosure provides a flexible display module capable of being rolled up, the flexible display module comprising:

[0007] A flexible display panel having a display side and a back side arranged opposite to each other in a thickness direction thereof;

[0008] A first functional film layer is formed on the display side of the flexible display panel;

[0009] A second functional film layer is formed on the back side of the flexible display panel;

[0010] The ratio of the thickness of the second functional film layer to the thickness of the first functional film layer is 0.5 to 1.5, and the ratio of the elastic modulus of the second functional film layer to the elastic modulus of the first functional film layer is 0.5 to 1.5.

[0011] In an exemplary embodiment of the present disclosure, when the display side of the flexible display panel is closer to the curled outer side than the back side thereof, the ratio of the thickness of the second functional film layer to the thickness of the first functional film layer is 0.5 to 1, and the ratio of the elastic modulus of the second functional film layer to the elastic modulus of the first functional film layer is 0.5 to 1; or

[0012] When the display side of the flexible display panel is closer to the inner side of the curling than the back side thereof, the ratio of the thickness of the second functional film layer to the thickness of the first functional film layer is 1 to 1.5, and the ratio of the elastic modulus of the second functional film layer to the elastic modulus of the first functional film layer is 1 to 1.5.

[0013] In an exemplary embodiment of the present disclosure, the thickness of the second functional film layer is equal to the thickness of the first functional film layer, and the elastic modulus of the second functional film layer is equal to the elastic modulus of the first functional film layer.

[0014] In an exemplary embodiment of the present disclosure, the elastic modulus of the first functional film layer and the second functional film layer is 4 GPa to 8 GPa.

[0015] In an exemplary embodiment of the present disclosure, the first functional film layer includes a flexible cover plate and a first adhesive layer, and the flexible cover plate is bonded to the display side of the flexible display panel through the first adhesive layer;

[0016] The second functional film layer includes a first supporting back film and a second adhesive layer, and the first supporting back film is bonded to the back side of the flexible display panel through the second adhesive layer.

[0017] In an exemplary embodiment of the present disclosure, the thickness of the flexible cover plate and the first supporting backing film is 40 μm to 60 μm, and the elastic modulus of the flexible cover plate and the first supporting backing film is 4 GPa to 8 GPa;

[0018] The thickness of the first adhesive layer and the second adhesive layer is 10 μm to 50 μm, and the elastic modulus of the first adhesive layer and the second adhesive layer is 20 MPa to 100 MPa.

[0019] In an exemplary embodiment of the present disclosure, the first functional film layer further includes an impact absorbing layer and a third adhesive layer, and the impact absorbing layer is bonded to a side of the flexible cover plate away from the flexible display panel through the third adhesive layer;

[0020] The second functional film layer further includes a first buffer layer and a patterned metal layer, wherein the first buffer layer is located on a side of the first supporting back film away from the flexible display panel; the patterned metal layer is located on a side of the first buffer layer away from the first supporting back film;

[0021] The elastic modulus of the impact absorbing layer is smaller than the elastic modulus of the flexible cover plate, and the elastic moduli of the first buffer layer and the patterned metal layer are smaller than the elastic modulus of the first supporting backing film.

[0022] In an exemplary embodiment of the present disclosure, the thickness of the impact absorbing layer is 100 μm to 200 μm, and the elastic modulus of the impact absorbing layer is 10 MPa to 200 MPa;

[0023] The thickness of the third adhesive layer is 10 μm to 50 μm, and the elastic modulus of the third adhesive layer is 20 MPa to 100 MPa;

[0024] The thickness of the first buffer layer is 80 μm to 120 μm, the thickness of the patterned metal layer is 100 μm to 200 μm, and the elastic modulus of the first buffer layer and the patterned metal layer is 10 MPa to 200 MPa.

[0025] In an exemplary embodiment of the present disclosure, the material of the flexible cover plate and the first supporting backing film comprises a polyimide organic material;

[0026] The material of the impact absorbing layer includes polyurethane organic material; and the materials of the first adhesive layer, the second adhesive layer, and the third adhesive layer include optical adhesive or pressure-sensitive adhesive;

[0027] The material of the first buffer layer includes foam, and adhesive materials are arranged on both sides of the foam to respectively adhere to the first supporting back film and the patterned metal layer; the material of the patterned metal layer includes stainless steel.

[0028] In an exemplary embodiment of the present disclosure, the second functional film layer further includes a second buffer layer, and the second buffer layer is located on a side of the patterned metal layer away from the first buffer layer;

[0029] Wherein, the elastic modulus of the second buffer layer is smaller than the elastic modulus of the first supporting backing film.

[0030] In an exemplary embodiment of the present disclosure, the patterned metal layer includes a first metal layer, a sixth adhesive layer located on a side of the first metal layer away from the first buffer layer, and a second metal layer located on a side of the sixth adhesive layer away from the first metal layer;

[0031] The second metal layer includes a plurality of spaced-apart metal pattern portions, and the metal pattern portions extend in the curling axis direction of the flexible display module.

[0032] In an exemplary embodiment of the present disclosure, the first functional film layer further includes a polarizer and a fourth adhesive layer, the polarizer is bonded to a side of the first adhesive layer close to the flexible display panel, and is bonded to a display side of the flexible display panel through the fourth adhesive layer;

[0033] The second functional film layer further includes a second supporting backing film and a fifth adhesive layer, and the second supporting backing film is bonded to the back side of the first supporting backing film through the fifth adhesive layer.

[0034] In an exemplary embodiment of the present disclosure, the thickness of the polarizer and the second supporting backing film is 40 μm to 60 μm, and the elastic modulus of the polarizer and the second supporting backing film is 4 GPa to 8 GPa;

[0035] The thickness of the fourth adhesive layer and the fifth adhesive layer is 10 μm to 50 μm, and the elastic modulus of the fourth adhesive layer and the fifth adhesive layer is 20 MPa to 100 MPa.

[0036] In an exemplary embodiment of the present disclosure, the material of the second supporting backing film includes a polyimide organic material, and the materials of the fourth adhesive layer and the fifth adhesive layer include an optical adhesive or a pressure-sensitive adhesive.

[0037] In an exemplary embodiment of the present disclosure, the first functional film layer includes a polarizer and a fourth adhesive layer, and the polarizer is bonded to the display side of the flexible display panel through the fourth adhesive layer;

[0038] The second functional film layer includes a second supporting back film and a fifth adhesive layer, and the second supporting back film is adhered to the back side of the flexible display panel through the fifth adhesive layer.

[0039] A second aspect of the present disclosure provides an electronic device, characterized by comprising any of the flexible display modules described above.

[0040] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0041] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0043] Figures 1 to 6 The structural schematic diagrams of the flexible display modules in the first to sixth embodiments are shown respectively;

[0044] Figure 7 Schematic diagram showing the strain simulation results of each functional layer in the flexible display panel of the flexible display module in the first to third embodiments during the external curling process;

[0045] Figure 8 FIG. 4 is a schematic diagram showing the strain simulation results of each functional layer in the flexible display panel of the flexible display module in the third embodiment and the fourth embodiment during the external curling process;

[0046] Fig. 9 Schematic diagram showing the strain simulation results of each functional layer in the flexible display panel during the external curling process of the flexible display module in the first embodiment, the fifth embodiment and the sixth embodiment;

[0047] Fig.10 A schematic diagram showing the strain simulation results of the first adhesive layer of OCA in the flexible display module of the first embodiment and the fifth embodiment under different numbers of turns during the external curling process;

[0048] Fig.11 Schematic diagrams showing strain simulation results of the inorganic buffer film layer at different numbers of turns during the external curling process of the flexible display module in Embodiment 1, Embodiment 5, and Embodiment 6;

[0049] Fig.12 Schematic diagrams showing strain simulation results of the second inorganic encapsulation layer at different numbers of turns during the external curling process of the flexible display module in Embodiment 1, Embodiment 5, and Embodiment 6;

[0050] Fig.13 Schematic diagrams showing strain simulation results of the first inorganic encapsulation layer at different numbers of turns during the external curling process of the flexible display module in Embodiment 1, Embodiment 5, and Embodiment 6;

[0051] Fig.14 Schematic diagrams showing strain simulation results of the backplane at different numbers of turns during the external curling process of the flexible display module in Embodiment 1, Embodiment 5, and Embodiment 6;

[0052] Fig.15 A schematic structural diagram of a flexible display module according to another embodiment is shown;

[0053] Fig.16 Shown in Fig.15 A bottom view of the flexible display module shown in ;

[0054] Fig.17A schematic structural diagram of a flexible display module in Embodiment 7 is shown.

[0055] Reference numerals:

[0056] 10. Flexible display panel; 11. Flexible cover plate; 12. First adhesive layer; 13. Polarizer; 14. Fourth adhesive layer; 15. First supporting back film; 16. Second adhesive layer; 17. Impact absorbing layer; 18. Third adhesive layer; 19. First buffer layer; 20. Patterned metal layer; 201. First metal layer; 202. Sixth adhesive layer; 203. Metal pattern part; 21. Second supporting back film; 22. Fifth adhesive layer; 23. Second buffer layer. DETAILED DESCRIPTION

[0057] The technical solution of the present disclosure is further specifically described below through examples and in conjunction with the accompanying drawings. In the specification, the same or similar figure numbers indicate the same or similar parts. The following description of the embodiments of the present disclosure with reference to the accompanying drawings is intended to explain the overall inventive concept of the present disclosure and should not be construed as a limitation of the present disclosure.

[0058] In addition, in the following detailed description, for the purpose of explanation, numerous specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details.

[0059] Unless otherwise defined, the technical terms or scientific terms used in this disclosure should be understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components.

[0060] The words “including” or “having” and the like used in the present disclosure mean that the elements or objects preceding the words include the elements or objects listed after the words and their equivalents, but do not exclude other elements or objects.

[0061] The embodiments of the present disclosure provide a flexible display module, which can be subjected to shape changes such as curling, bending, and folding.

[0062] The flexible display module of the disclosed embodiment may include a flexible display panel, a first functional film layer and a second functional film layer. The flexible display panel may have a display side and a back side arranged opposite to each other in the thickness direction thereof. For example, the flexible display panel may be an OLED display panel to ensure that it has good curling, bending and other properties; the first functional film layer may be formed on the display side of the flexible display panel, and the second functional film layer may be formed on the back side of the flexible display panel.

[0063] The structure of the flexible display module according to different embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0064] Embodiment 1

[0065] like Figure 1 As shown, the flexible display panel 10 may include an inorganic buffer film layer, a backplane, an encapsulation layer (not shown in the figure), etc. stacked in sequence. It should be understood that the backplane may include a driving circuit layer and an organic light-emitting device, wherein the driving circuit layer may include an inorganic insulating stack, a transistor, a storage capacitor, a signal line, etc.; the organic light-emitting device may include an anode, an organic light-emitting material, a cathode, etc. In addition, the backplane may also include a flat layer made of organic materials, a pixel definition layer, a spacer, etc. The encapsulation layer may be a single-layer structure made of inorganic materials, or a composite layer, that is, the encapsulation layer may include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in sequence, and the first inorganic encapsulation layer is closer to the organic light-emitting device than the second inorganic encapsulation layer.

[0066] The first functional film layer may include a flexible cover plate 11, a first adhesive layer 12, a polarizer 13 and a fourth adhesive layer 14. The flexible cover plate 11 may be bonded to the display side of the flexible display panel 10 through the first adhesive layer 12, the polarizer 13 is bonded to the side of the first adhesive layer 12 close to the flexible display panel 10, and is bonded to the display side of the flexible display panel 10 through the fourth adhesive layer 14; and the second functional film layer may include a first supporting back film 15 and a second adhesive layer 16. The first supporting back film 15 is bonded to the back side of the flexible display panel 10 through the second adhesive layer 16.

[0067] In this embodiment, the overall thickness and elastic modulus of the first functional film layer are much greater than the overall thickness and elastic modulus of the second functional film layer, that is, the overall thickness and elastic modulus of the first functional film layer are more than twice the overall thickness and elastic modulus of the second functional film layer. This can be understood as the film layer structure on both sides of the flexible display panel 10 of the embodiment of the present disclosure being an asymmetric design as a whole.

[0068] For example, the first adhesive layer 12 of this embodiment may be an optical adhesive, but is not limited thereto, and may also be a pressure-sensitive adhesive, etc.; and the second adhesive layer 16 and the fourth adhesive layer 14 may be a pressure-sensitive adhesive, but are not limited thereto, and may also be an optical adhesive, depending on the specific circumstances.

[0069] Embodiment 2

[0070] The main difference from the first embodiment is:

[0071] The overall design of the first functional film layer and the second functional film layer is different from that of the first embodiment, and the rest of the design (eg, the structure of the flexible display panel 10 ) may be the same as that of the first embodiment, but is not limited thereto, and may also be different, depending on the specific circumstances.

[0072] In an embodiment of the present disclosure, the ratio of the thickness of the second functional film layer to the thickness of the first functional film layer is 0.5 to 1.5, and the ratio of the elastic modulus of the second functional film layer to the elastic modulus of the first functional film layer is 0.5 to 1.5, that is, the thickness of one of the first functional film layer and the second functional film layer cannot be less than half of the thickness of the other, and the elastic modulus of one cannot be less than half of the elastic modulus of the other. Such a design can ensure that the overall thickness and elastic modulus of the film layer structure on both sides of the flexible display panel 10 are similar, that is: it can be understood that the film layer structure on both sides of the flexible display panel 10 is symmetrically designed as a whole.

[0073] Since the film layer structures on both sides of the flexible display panel 10 of the embodiment of the present disclosure are symmetrically designed as a whole, compared with the asymmetric design mentioned in the first embodiment, the present embodiment can ensure that the strain absorption capacity on both sides of the flexible display panel 10 is close during the curling process, that is, the strain absorption capacity on both sides of the flexible display panel 10 is balanced, so that the strain accumulation degree of the key layers of the flexible display panel 10 (that is, the inorganic buffer film layer, the backplane, the inorganic encapsulation layer, etc.) and the functional film layers on both sides as the number of curling turns increases is greatly reduced, so as to alleviate or avoid the peeling of the flexible display panel 10 and the film layer structures on both sides during the curling process; in addition, it can also alleviate or avoid the situation where the key layers of the flexible display panel 10 are broken and thus fail during the curling process, that is, the entire flexible display module can meet the performance requirements of curling and improve product quality.

[0074] It should be noted that the aforementioned symmetrical design includes but is not limited to similar thickness, similar elastic modulus, and may also include similar material properties and the like.

[0075] For example, when the flexible display module is an external curling product, that is, when the display side of the flexible display panel 10 is closer to the curling outer side than its back side, that is, when the second functional film layer of the flexible display module is located in the curling inner layer and the first functional film layer is located in the curling outer layer, in order to meet the curling performance requirements of the flexible display module, the thickness of the second functional film layer can be less than or equal to the thickness of the first functional film layer, and the thickness of the second functional film layer can be greater than or equal to half of the thickness of the first functional film layer, that is, the ratio of the thickness of the second functional film layer to the thickness of the first functional film layer can be 0.5 to 1, such as: 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.; at the same time, the elastic modulus of the second functional film layer is less than or equal to that of the first functional film layer. The elastic modulus of the second functional film layer is greater than or equal to half of the elastic modulus of the first functional film layer, that is, the ratio of the elastic modulus of the second functional film layer to the elastic modulus of the first functional film layer is 0.5 to 1, such as 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc., so that while ensuring that the second functional film layer has good curling performance, the strain accumulation degree of the key layer of the flexible display panel 10 and the functional film layers on both sides as the curling number increases can be greatly reduced, so as to alleviate or avoid the peeling of the flexible display panel 10 and the film layer structures on both sides thereof during the curling process; in addition, the fracture and failure of the key layer of the flexible display panel 10 during the curling process can be alleviated or avoided.

[0076] Similarly, when the flexible display module is an inner-curled product, that is, when the display side of the flexible display panel 10 is closer to the curled outer side than its back side, the thickness of the first functional film layer can be less than or equal to the thickness of the second functional film layer, and the thickness of the first functional film layer can be greater than or equal to half of the thickness of the second functional film layer, that is, the ratio of the thickness of the second functional film layer to the thickness of the first functional film layer can be 1 to 1.5, such as: 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc.; at the same time, the elastic modulus of the first functional film layer is less than or equal to the elastic modulus of the second functional film layer, and the elastic modulus of the first functional film layer is greater than or equal to half of the elastic modulus of the second functional film layer, that is, the ratio of the elastic modulus of the second functional film layer to the elastic modulus of the first functional film layer can be 1 to 1.5, such as: 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc.

[0077] In an embodiment of the present disclosure, the overall elastic modulus of the first functional film layer and the overall elastic modulus of the second functional film layer may be 4 Gpa to 8 Gpa, such as: 4 Gpa, 5 Gpa, 6 Gpa, 7 Gpa, 8 Gpa, etc. This design can not only meet the functional requirements of the first functional film layer and the second functional film layer, but also ensure the curling performance of the first functional film layer and the second functional film layer, so that they meet the curling requirements.

[0078] Among them, in order to make the flexible display module meet the requirements of internal curling and external curling at the same time, that is, no matter whether the flexible display module is curled inwardly or outwardly, the strain accumulation degree of the key layer of the flexible display panel 10 and the functional film layers on both sides will be greatly reduced as the number of curling turns increases. The embodiment of the present disclosure can make the thickness of the second functional film layer equal to the thickness of the first functional film layer, and the elastic modulus of the second functional film layer is equal to the elastic modulus of the first functional film layer.

[0079] For example, Figure 2 As shown, the first functional film layer of the embodiment of the present disclosure may include a flexible cover plate 11 and a first adhesive layer 12, and the flexible cover plate 11 may be bonded to the display side of the flexible display panel 10 through the first adhesive layer 12; and the second functional film layer may include a first supporting back film 15 and a second adhesive layer 16, and the first supporting back film 15 is bonded to the back side of the flexible display panel 10 through the second adhesive layer 16.

[0080] Optionally, the thickness of the flexible cover plate 11 and the first supporting back film 15 may be 40μm to 60μm, such as: 40μm, 45μm, 50μm, 55μm, 60μm, etc.; and the elastic modulus of the flexible cover plate 11 and the first supporting back film 15 may be 4Gpa to 8Gpa, such as: 4Gpa, 5Gpa, 6Gpa, 7Gpa, 8Gpa, etc.; such a design can meet the protection function requirements of the flexible cover plate 11 and the first supporting back film 15 while ensuring the curling performance of the flexible cover plate 11 and the first supporting back film 15, thereby meeting the curling requirements of the entire flexible display module.

[0081] The thickness of the first adhesive layer 12 and the thickness of the second adhesive layer 16 can be 10μm to 50μm, such as: 10μm, 20μm, 30μm, 40μm, 50μm, etc., and the elastic modulus of the first adhesive layer 12 and the elastic modulus of the second adhesive layer 16 can be 20Mpa to 100Mpa, such as: 20Mpa, 40Mpa, 60Mpa, 80Mpa, 100Mpa, etc.; such a design can ensure the bonding stability of the first adhesive layer 12 and the second adhesive layer 16 while ensuring the curling performance of the first adhesive layer 12 and the second adhesive layer 16, thereby meeting the curling requirements of the entire flexible display module.

[0082] For example, the flexible cover plate 11 and the first support backing film 15 may be a single-layer structure or a multi-layer composite structure. Wherein, when the flexible cover plate 11 and the first support backing film 15 are single-layer structures, the material of the flexible cover plate 11 and the material of the first support backing film 15 may include polyimide (PI) organic material to ensure that the flexible cover plate 11 and the first support backing film 15 have good flexibility, but not limited to this, the flexible cover plate 11 and the first support backing film 15 may also be made of other materials, for example: PET (polyethylene terephthalate), CPI (polyimide) and other organic materials, depending on the specific situation. When the flexible cover plate 11 and the first support backing film 15 are multi-layer composite structures, part of the film layer of the flexible cover plate 11 and the first support backing film 15 may be an organic film layer such as PI, and the other part may be an ultra-thin glass film layer, and this ultra-thin glass film layer may be sandwiched between two layers of PI organic film layers.

[0083] In addition, the flexible cover plate 11 may include a hard coating layer disposed away from the flexible display panel to protect the flexible cover plate 11 .

[0084] The material of the first adhesive layer 12 and the material of the second adhesive layer 16 can be an optical adhesive (OCA), so that the adhesive layer can have good optical properties while ensuring the bonding stability.

[0085] It should be noted that, since the second adhesive layer 16 is located on the back side of the flexible display panel 10, the second adhesive layer 16 may not use OCA as the adhesive material, but may use other adhesive materials, such as pressure-sensitive adhesive (PSA), so as to ensure bonding stability while reducing costs.

[0086] In addition, when the second adhesive layer 16 is a pressure-sensitive adhesive and the first adhesive layer 12 is an OCA, the thickness of the second adhesive layer 16 can be less than the thickness of the first adhesive layer 12. For example, the thickness of the first adhesive layer 12 can be 50 μm, and the thickness of the second adhesive layer 16 can be 25 μm, etc. In this way, the thickness of the flexible display module can be reduced while ensuring the curling performance of the flexible display module.

[0087] Embodiment 3

[0088] The main difference from the second embodiment is:

[0089] Based on the second embodiment, Figure 3As shown, the first functional film layer, in addition to the flexible cover plate 11 and the first adhesive layer 12 mentioned in Example 2, may also include an impact absorbing layer 17 and a third adhesive layer 18. The impact absorbing layer 17 is bonded to the side of the flexible cover plate 11 away from the flexible display panel 10 through the third adhesive layer 18; wherein, the elastic modulus of the impact absorbing layer 17 may be smaller than the elastic modulus of the flexible cover plate 11. Such a design can improve the impact resistance of the display side of the flexible display module while ensuring the curling performance, and ensure that the functionality of the flexible display module is not damaged, that is: improve the pen dropping and ball dropping performance of the flexible display module, thereby enhancing the mechanical properties and display effects of the flexible display module, broadening the scope of application and practical application of the curling module, and providing experience and theoretical guidance for the subsequent stacking design of the curling module.

[0090] At the same time, if Figure 3 As shown, in addition to the first supporting back film 15 and the second adhesive layer 16 mentioned in Example 2, the second functional film layer may also include a first buffer layer 19 and a patterned metal layer 20. The first buffer layer 19 may be located on the side of the first supporting back film 15 away from the flexible display panel 10; and the patterned metal layer 20 may be located on the side of the first buffer layer 19 away from the first supporting back film 15; wherein the elastic modulus of the first buffer layer 19 and the patterned metal layer 20 is smaller than the elastic modulus of the first supporting back film 15. Such a design can improve the impact resistance and supporting flatness of the back side of the flexible display module on the basis of ensuring the curling performance, thereby enhancing the mechanical properties of the curling module.

[0091] In addition, in the present embodiment, while adding an impact absorption layer 17 and a third adhesive layer 18 to the first functional film layer, the second functional film layer is also added with a first buffer layer 19 and a patterned metal layer 20, so that the first functional film layer and the second functional film layer can be ensured to maintain a symmetrical design as a whole, so that the strain accumulation degree of the key layer of the flexible display panel 10 and the functional film layers on both sides as the number of curling turns increases can be greatly reduced, so as to alleviate or avoid the peeling of the flexible display panel 10 and the film layer structures on both sides thereof during the curling process; and it can also alleviate or avoid the situation where the key layer of the flexible display panel 10 breaks and fails during the curling process.

[0092] For example, the thickness of the impact absorbing layer 17 of the present embodiment may be 100μm to 200μm, such as: 100μm, 120μm, 140μm, 160μm, 180μm, 200μm, etc.; and the elastic modulus of the impact absorbing layer 17 may be 10Mpa to 200Mpa, such as: 10Mpa, 48Mpa, 86Mpa, 124Mpa, 162Mpa, 200Mpa; such a design can ensure the buffering performance of the impact absorbing layer 17 while ensuring the curling performance of the impact absorbing layer 17, thereby meeting the curling requirements of the entire flexible display module.

[0093] The thickness of the first buffer layer 19 can be 80μm to 120μm, such as: 80μm, 90μm, 100μm, 110μm, 120μm, etc.; and the elastic modulus of the first buffer layer 19 can be 10Mpa to 200Mpa, such as: 10Mpa, 48Mpa, 86Mpa, 124Mpa, 162Mpa, 200Mpa. This design can ensure the buffering performance of the first buffer layer 19 while ensuring the curling performance of the first buffer layer 19, thereby meeting the curling requirements of the entire flexible display module.

[0094] The thickness of the patterned metal layer 20 can be 100μm to 200μm, such as: 100μm, 120μm, 140μm, 160μm, 180μm, 200μm, etc.; and the elastic modulus of the patterned metal layer 20 can be 10Mpa to 200Mpa, such as: 10Mpa, 48Mpa, 86Mpa, 124Mpa, 162Mpa, 200Mpa. This design can ensure the supporting performance of the patterned metal layer 20 while ensuring the curling performance of the third adhesive layer 18, thereby meeting the curling requirements of the entire flexible display module.

[0095] The thickness of the third adhesive layer 18 can be 10μm to 50μm, such as: 10μm, 20μm, 30μm, 40μm, 50μm, etc., and the elastic modulus of the third adhesive layer 18 can be 20Mpa to 100Mpa, such as: 20Mpa, 40Mpa, 60Mpa, 80Mpa, 100Mpa, etc.; this design can ensure the bonding stability of the third adhesive layer 18 while also ensuring the curling performance of the third adhesive layer 18, thereby meeting the curling requirements of the entire flexible display module.

[0096] Among them, the material of the impact absorbing layer 17 may be a polyurethane organic material, but is not limited to this, and may also be other organic materials. The material of the third bonding layer 18 may be an optical adhesive to ensure that it has good optical properties, but is not limited to this, and may also be a pressure-sensitive adhesive. The material of the first buffer layer 19 may be foam, and adhesive materials are provided on both sides of the foam to bond with the first support backing film 15 and the patterned metal layer 20 respectively. That is to say, this first buffer layer 19 can play a role of buffering while also bonding the first support backing film 15 and the patterned metal layer 20; it should be noted that the sum of the thickness of the foam and the thickness of the adhesive materials on both sides can be understood as the thickness of the entire first buffer layer 19. The material of the patterned metal layer 20 may include stainless steel material, but is not limited to this, and may also be other materials; it should be understood that the embodiment of the present disclosure adjusts its elastic modulus by adjusting the thickness of the patterned metal layer 20 and its opening pattern.

[0097] The patterned metal layer 20 may be a single-layer structure, but is not limited thereto, and may also be a multi-layer composite structure, for example: Fig.15 As shown, the patterned metal layer 20 may include a first metal layer 201, a sixth bonding layer 202 located on the side of the first metal layer 201 away from the first buffer layer 19, and a second metal layer located on the side of the sixth bonding layer 202 away from the first metal layer 201; it should be noted that the first metal layer 201 may be a whole-surface film layer that has not been patterned; and the second metal layer may be a patterned film layer that has been patterned. The embodiment of the present disclosure can adjust the elastic modulus of the patterned metal layer 20 by adjusting the thickness of the first metal layer 201 and the second metal layer in the patterned metal layer 20 or adjusting the pattern of the second metal layer.

[0098] Specifically, the second metal layer may include a plurality of spaced metal pattern portions 203 , and the metal pattern portions 203 extend in the curling axis direction of the flexible display module, so that the supporting performance of the patterned metal layer is ensured while also ensuring that it has good curling performance.

[0099] It should be noted that the shape of the metal pattern portion 203 is not limited to Fig.16 The strip shape shown in the figure may also be a square, a circle, an ellipse, a hexagon, an octagon, etc., and the arrangement of the metal pattern portion 203 is not limited to that shown in the figure, and can be determined according to actual needs.

[0100] The first metal layer 201 and the metal pattern part 203 mentioned above may be made of stainless steel, but are not limited thereto, and may also be other metal materials. The sixth adhesive layer 202 may be made of pressure-sensitive adhesive, but are not limited thereto, and may also be other adhesive materials, such as optical adhesives.

[0101] Based on the foregoing, the embodiment of the present disclosure can adjust and match the elastic modulus of the impact absorbing layer 17 and the patterned metal layer 20 so that the first functional film layer and the second functional film layer as a whole are still symmetrically designed with respect to the flexible display panel 10. This can not only meet the performance requirements of curling, but also improve the impact resistance of the curling product, that is, the pen-dropping and ball-dropping performance.

[0102] The curling performance and pen-dropping and ball-dropping test results of the flexible display module of the third embodiment are as shown in Table 1 below compared with the flexible display module of the second embodiment:

[0103] Table 1

[0104] Verification scheme Embodiment 2 Embodiment 3 Curling performance pass pass Pen height / mm 2 10 Drop ball height / mm 1.6 3.0

[0105] It can be seen from Table 1 that in the verification process of the curling performance, the curling performance of the flexible display modules of Example 2 and Example 3 meets the requirements, that is, they pass the test. In the pen-dropping and ball-dropping test process, the maximum pen-dropping height of the flexible display module of Example 2 is 2mm, and the maximum ball-dropping height is 1.6mm; while the maximum pen-dropping height of the flexible display module of Example 3 is 10mm, and the maximum ball-dropping height is 3.0mm, which is 5 times higher than the maximum pen-dropping height of Example 2, and the maximum ball-dropping height is about 2 times higher; therefore, it can be seen that Example 3 has better pen-dropping and ball-dropping performance than Example 2, so it can be seen that the design method of Example 3 can better improve the impact resistance of the display side of the flexible display module, ensure that the functionality of the flexible display module is not damaged, and then enhance the mechanical properties and display effects of the flexible display module, broaden the scope of application and practical application of the curling module, and provide experience and theoretical guidance for the stacking design of subsequent curling modules.

[0106] Embodiment 4

[0107] The main difference from the third embodiment is that the relative position relationship between the impact absorbing layer 17, the flexible cover plate 11 and the flexible display panel 10 is different. Specifically, in the third embodiment, the impact absorbing layer 17 is located on the side of the flexible cover plate 11 away from the flexible display panel 10, while in this embodiment, Figure 4 As shown, the impact absorbing layer 17 is located on a side of the flexible cover plate 11 close to the flexible display panel 10 .

[0108] It should be noted that, except for the above-mentioned differences between this embodiment and the third embodiment, other features of this embodiment are the same as those of the third embodiment, which will not be repeated here.

[0109] It should be understood that in this embodiment, the first functional film layer and the second functional film layer are designed to be symmetrical as a whole, so that the degree of strain accumulation of the key layer of the flexible display panel 10 and the functional film layers on both sides as the number of curling turns increases can be greatly reduced, so as to alleviate or avoid the peeling of the flexible display panel 10 and the film layer structures on both sides thereof during the curling process; and it can also alleviate or avoid the situation where the key layer of the flexible display panel 10 breaks and fails during the curling process.

[0110] Among them, research has shown that in this embodiment, since the impact absorbing layer 17 is placed on the side of the flexible cover plate 11 close to the flexible display panel 10, compared with the third embodiment in which the impact absorbing layer 17 is placed on the side of the flexible cover plate 11 away from the flexible display panel 10, the strain of the key layer in the flexible display panel 10 is easily increased during the curling process, such as Figure 8 As shown, it will affect the display effect.

[0111] Embodiment 5

[0112] The main difference from the second embodiment is:

[0113] On the basis of Example 2, the first functional film layer, in addition to the flexible cover plate 11 and the first adhesive layer 12 mentioned in Example 2, may also include a polarizer 13 and a fourth adhesive layer 14, wherein the polarizer 13 is bonded to the side of the first adhesive layer 12 close to the flexible display panel 10, and is bonded to the display side of the flexible display panel 10 through the fourth adhesive layer 14. By setting the polarizer 13, reflection can be reduced, thereby improving the display effect.

[0114] On the basis that the first functional film layer further includes the polarizer 13 and the fourth adhesive layer 14, in order to make the second functional layer and the first functional film layer as a whole symmetrically designed with respect to the flexible display panel 10, such as Figure 5 As shown, the second functional film layer of the embodiment of the present disclosure includes not only the first supporting back film 15 and the second adhesive layer 16 mentioned in Example 2, but also a second supporting back film 21 and a fifth adhesive layer 22. The second supporting back film 21 is bonded to the back side of the first supporting back film 15 through the fifth adhesive layer 22. By ensuring that the first functional film layer and the second functional film layer maintain a symmetrical design as a whole, the strain accumulation degree of the key layer of the flexible display panel 10 and the functional film layers on both sides as the number of curling turns increases can be greatly reduced, so as to alleviate or avoid the peeling of the flexible display panel 10 and the film layer structures on both sides thereof during the curling process; and it can also alleviate or avoid the situation where the key layer of the flexible display panel 10 breaks and fails during the curling process.

[0115] For example, the thickness of the polarizer 13 and the second supporting back film 21 can be 40μm to 60μm, such as: 40μm, 45μm, 50μm, 55μm, 60μm, etc.; and the elastic modulus of the polarizer 13 and the second supporting back film 21 can be 4Gpa to 8Gpa, such as: 4Gpa, 5Gpa, 6Gpa, 7Gpa, 8Gpa, etc.; such a design can meet the functional requirements of the polarizer 13 and the second supporting back film 21 while ensuring the curling performance of the polarizer 13 and the second supporting back film 21, thereby meeting the curling requirements of the entire flexible display module.

[0116] The thickness of the fourth adhesive layer 14 and the fifth adhesive layer 22 can be 10μm to 50μm, such as: 10μm, 20μm, 30μm, 40μm, 50μm, etc., and the elastic modulus of the fourth adhesive layer 14 and the fifth adhesive layer 22 can be 20Mpa to 100Mpa, such as: 20Mpa, 40Mpa, 60Mpa, 80Mpa, 100Mpa, etc.; such a design can ensure the bonding stability of the fourth adhesive layer 14 and the fifth adhesive layer 22 while ensuring the curling performance of the fourth adhesive layer 14 and the fifth adhesive layer 22, thereby meeting the curling requirements of the entire flexible display module.

[0117] For example, the material of the second supporting backing film 21 can be PI organic material to ensure that the first supporting backing film 15 has good flexibility, but it is not limited thereto. The second supporting backing film 21 can also be made of other materials, depending on the specific situation. The polarizer 13 can be a composite structure, which depends on actual needs and is not described in detail here. The material of the fourth adhesive layer 14 and the material of the fifth adhesive layer 22 can be an optical adhesive or a pressure-sensitive adhesive to ensure bonding stability.

[0118] It should be noted that the fourth adhesive layer 14 and the fifth adhesive layer 22 may preferably be pressure-sensitive adhesive, which can reduce costs while ensuring bonding stability; in addition, the thickness of the flexible display module can be reduced while ensuring the curling performance of the flexible display module.

[0119] It should be understood that in this embodiment, the first functional film layer and the second functional film layer are designed to be symmetrical as a whole, so that the degree of strain accumulation of the key layer of the flexible display panel 10 and the functional film layers on both sides as the number of curling turns increases can be greatly reduced, so as to alleviate or avoid the peeling of the flexible display panel 10 and the film layer structures on both sides thereof during the curling process; and it can also alleviate or avoid the situation where the key layer of the flexible display panel 10 breaks and fails during the curling process.

[0120] Embodiment 6

[0121] The main difference from the fifth embodiment is:

[0122] The first functional film layer in the sixth embodiment does not include the flexible cover plate 11 and the first adhesive layer 12, and the second functional film layer does not include the first supporting back film 15 and the second adhesive layer 16. Figure 6 As shown, the first functional film layer of this embodiment may only include a polarizer 13 and a fourth adhesive layer 14, and the polarizer 13 is bonded to the display side of the flexible display panel 10 through the fourth adhesive layer 14; and the second functional film layer may only include a second supporting back film 21 and a fifth adhesive layer 22, and the second supporting back film 21 is bonded to the back side of the flexible display panel 10 through the fifth adhesive layer 22.

[0123] It should be noted that the structures of the polarizer 13 , the fourth adhesive layer 14 , the second supporting backing film 21 , and the fifth adhesive layer 22 in the embodiment of the present disclosure can refer to the contents in the fifth embodiment, and will not be repeated here.

[0124] It should be understood that in this embodiment, the first functional film layer and the second functional film layer are designed to be symmetrical as a whole, so that the degree of strain accumulation of the key layer of the flexible display panel 10 and the functional film layers on both sides as the number of curling turns increases can be greatly reduced, so as to alleviate or avoid the peeling of the flexible display panel 10 and the film layer structures on both sides thereof during the curling process; and it can also alleviate or avoid the situation where the key layer of the flexible display panel 10 breaks and fails during the curling process.

[0125] Embodiment 7

[0126] The main difference from the third embodiment is that the second functional film layer includes the film layer mentioned in the third embodiment, such as Fig.17 As shown, a second buffer layer 23 may also be included. The second buffer layer 23 is located on a side of the patterned metal layer 20 away from the first buffer layer 19 . It should be understood that the elastic modulus of the second buffer layer 23 is smaller than the elastic modulus of the first supporting backing film 15 .

[0127] In this embodiment, the second buffer layer 23 is provided to further improve the impact resistance and support flatness of the flexible display module. In addition, it is convenient to assemble the flexible display module with the whole device.

[0128] It should be noted that the material and thickness of the second buffer layer 23 of the embodiment of the present disclosure may refer to the material and thickness of the first buffer layer 19 mentioned above, and will not be repeated here.

[0129] In addition, it should be noted that the metal layer between the first buffer layer 19 and the second buffer layer 23 of the embodiment of the present disclosure is not limited to a patterned film layer, but may also be an unpatterned film layer. When it is an unpatterned metal film layer, in order to ensure the overall curling performance, the unpatterned metal film layer may be designed to be thinner.

[0130] According to the contents of the above embodiments, the first functional film layer and the second functional film layer in the first embodiment are designed asymmetrically as a whole; while the first functional film layer and the second functional film layer in the second to seventh embodiments are designed symmetrically as a whole. The strain accumulation in each embodiment is described in detail below in conjunction with the accompanying drawings, specifically:

[0131] from Figure 7It can be obtained that: in Example 1, during the external curling of the flexible display module, the strain of the inorganic buffer film layer is about 0.43%, the strain of the encapsulation layer is about 0.49%, and the strain of the backplane is about 0.54%. In Example 2, during the external curling of the flexible display module, the strain of the inorganic buffer film layer is about 0.39%, the strain of the encapsulation layer is about 0.39%, and the strain of the backplane is about 0.39%; in Example 3, during the external curling of the flexible display module, the strain of the inorganic buffer film layer is about 0.28%, the strain of the encapsulation layer is about 0.28%, and the strain of the backplane is about 0.28%.

[0132] It can be seen from this that the first functional film layer and the second functional film layer in Example 2 and Example 3 are symmetrically designed compared to the asymmetrical design of the first functional film layer and the second functional film layer in Example 1. The strain accumulation of each functional layer of the flexible display panel 10 (i.e., the inorganic buffer film layer, the encapsulation layer and the back panel) is greatly reduced, so as to alleviate or avoid the functional layer of the flexible display panel 10 from breaking and thus failing during the curling process.

[0133] from Figure 8 It can be obtained that: in Example 3, during the outward curling of the flexible display module, the strain of the inorganic buffer film layer is approximately 0.28%, the strain of the encapsulation layer is approximately 0.28%, and the strain of the back panel is approximately 0.28%; in Example 4, during the outward curling of the flexible display module, the strain of the inorganic buffer film layer is approximately 0.65%, the strain of the encapsulation layer is approximately 0.65%, and the strain of the back panel is approximately 0.65%.

[0134] It can be seen from this that the stacking design of the first functional film layer in Example 4 will cause the strain of each functional layer of the flexible display panel 10 (i.e., inorganic buffer film layer, encapsulation layer and backplane) to increase sharply compared with the stacking design of the first functional film layer in Example 3. Therefore, in Example 3 and Example 4, the stacking design of the first functional film layer in Example 3 is preferred. In this way, the strain accumulation of each functional layer of the flexible display panel 10 (i.e., inorganic buffer film layer, encapsulation layer and backplane) is greatly reduced to alleviate or avoid the breakage and failure of the functional layer of the flexible display panel 10 during the curling process, while also improving the impact resistance of the flexible display module.

[0135] from Fig. 9It can be obtained that: in Example 1, during the external curling of the flexible display module, the strain of the inorganic buffer film layer is about 0.43%, the strain of the first inorganic encapsulation layer is about 0.49%, the strain of the second inorganic encapsulation layer is about 0.43%, and the strain of the backplane is about 0.54%. In Example 6, during the external curling of the flexible display module, the strain of the inorganic buffer film layer is about 0.39%, the strain of the first inorganic encapsulation layer is about 0.39%, the strain of the second inorganic encapsulation layer is about 0.39%, and the strain of the backplane is about 0.39%; in Example 5, during the external curling of the flexible display module, the strain of the inorganic buffer film layer is about 0.28%, the strain of the first inorganic encapsulation layer is about 0.28%, the strain of the second inorganic encapsulation layer is about 0.28%, and the strain of the backplane is about 0.28%.

[0136] It can be seen from this that the first functional film layer and the second functional film layer in Examples 5 and 6 are symmetrically designed compared to the asymmetrical design of the first functional film layer and the second functional film layer in Example 1. The strain accumulation of each functional layer of the flexible display panel 10 (i.e., the inorganic buffer film layer, the encapsulation layer and the back panel) is greatly reduced, so as to alleviate or avoid the functional layer of the flexible display panel 10 from breaking and thus failing during the curling process.

[0137] from Fig.10 It can be obtained that: in Example 1, during the external curling of the flexible display module, the strain value of the first adhesive layer 12 using OCA as its material tends to 152.0 as the number of curling turns increases; in Example 5, during the external curling of the flexible display module, the strain value of the first adhesive layer 12 using OCA as its material tends to 140.0 as the number of curling turns increases; in addition, the strain of the first adhesive layer 12 changes with the number of turns, and the strain value of Example 5 is less than the strain value of Example 1.

[0138] It can be seen from this that the symmetrical design of the first functional film layer and the second functional film layer in Example 5 is compared with the asymmetrical design of the first functional film layer and the second functional film layer in Example 1, which can alleviate or avoid the situation where the first adhesive layer 12 is easily peeled off from the flexible display panel 10 during the curling process, thereby improving product stability.

[0139] from Figures 11 to 14 It can be obtained that the strain values ​​of the inorganic buffer film layer, the second inorganic encapsulation layer, the first inorganic encapsulation layer and the backplane in the flexible display panel 10 change with the number of turns, and the strain values ​​of the fifth embodiment are smaller than the strain values ​​of the first embodiment and the sixth embodiment.

[0140] It can be seen that the design of the flexible display module in Example 5 can better reduce the strain accumulation of each functional layer (i.e., inorganic buffer film layer, encapsulation layer and back panel) of the flexible display panel 10 compared with the design of the flexible display module in Example 1 and Example 2, so as to alleviate or avoid the functional layer of the flexible display panel 10 from breaking and thus failing during the curling process.

[0141] Based on the above analysis, it can be known that the structures of the third, fifth and seventh embodiments of the present disclosure are better, the structures of the second and sixth embodiments are second, and the structures of the first and fourth embodiments are the worst. Therefore, the flexible display modules of the third, fifth, second and sixth embodiments of the present disclosure are preferred. Compared with the solutions of the first and fourth embodiments, the strain accumulation of each functional layer (i.e., inorganic buffer film layer, encapsulation layer and backplane) of the flexible display panel 10 is greatly reduced to alleviate or avoid the fracture and failure of the functional layer of the flexible display panel 10 during the curling process. At the same time, it can also alleviate or avoid the easy peeling of the first adhesive layer 12 from the flexible display panel 10 during the curling process, thereby improving the product stability. In addition, it can also improve the impact resistance of the display side of the flexible display module, ensure that the functionality of the flexible display module is not damaged, and then enhance the mechanical properties and display effect of the flexible display module, broaden the scope of application and practical application of the curling module, and provide experience and theoretical guidance for the stacking design of subsequent curling modules.

[0142] An embodiment of the present disclosure further provides an electronic device, which includes the flexible display module described in any of the aforementioned embodiments.

[0143] It should be noted that, in addition to the flexible display module mentioned above, the electronic device may also include other components and components, such as a battery, a main board, a housing, etc. Those skilled in the art may make corresponding supplements according to the specific use requirements of the electronic device, which will not be elaborated here.

[0144] In the embodiments of the present disclosure, the specific type of electronic device is not particularly limited, and any type of electronic device commonly used in the art can be used, such as televisions, mobile phones, computers, medical equipment, etc. Those skilled in the art can make corresponding choices based on the specific purpose of the electronic device, which will not be repeated here.

[0145] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A flexible display module capable of being rolled up, characterized in that: include: A flexible display panel, comprising a back plate, wherein the flexible display panel has a display side and a back side arranged opposite to each other in a thickness direction thereof; A first functional film layer is formed on the display side of the flexible display panel; A second functional film layer is formed on the back side of the flexible display panel; Among them, the ratio of the thickness of the second functional film layer to the thickness of the first functional film layer is 0.5 to 1.5, and the ratio of the elastic modulus of the second functional film layer to the elastic modulus of the first functional film layer is 0.5 to 1.5; when the display side of the flexible display panel is closer to the curling outer side than its back side, the ratio of the thickness of the second functional film layer to the thickness of the first functional film layer is 0.5 to 1, and the ratio of the elastic modulus of the second functional film layer to the elastic modulus of the first functional film layer is 0.5 to 1; or, when the display side of the flexible display panel is closer to the curling inner side than its back side, the ratio of the thickness of the second functional film layer to the thickness of the first functional film layer is 1 to 1.5, and the ratio of the elastic modulus of the second functional film layer to the elastic modulus of the first functional film layer is 1 to 1.

5.

2. The flexible display module according to claim 1, characterized in that: The thickness of the second functional film layer is equal to that of the first functional film layer, and the elastic modulus of the second functional film layer is equal to that of the first functional film layer.

3. The flexible display module according to claim 1, characterized in that: The elastic modulus of the first functional film layer and the second functional film layer is 4 GPa to 8 GPa.

4. The flexible display module according to any one of claims 1 to 3, characterized in that: The first functional film layer includes a flexible cover plate and a first adhesive layer, and the flexible cover plate is bonded to the display side of the flexible display panel through the first adhesive layer; The second functional film layer includes a first supporting back film and a second adhesive layer, and the first supporting back film is bonded to the back side of the flexible display panel through the second adhesive layer.

5. The flexible display module according to claim 4, characterized in that: The thickness of the flexible cover plate and the first supporting backing film is 40 μm to 60 μm, and the elastic modulus of the flexible cover plate and the first supporting backing film is 4 GPa to 8 GPa; The thickness of the first adhesive layer and the second adhesive layer is 10 μm to 50 μm, and the elastic modulus of the first adhesive layer and the second adhesive layer is 20 Mpa to 100 Mpa.

6. The flexible display module according to claim 4, characterized in that: The first functional film layer further includes an impact absorbing layer and a third adhesive layer, and the impact absorbing layer is bonded to a side of the flexible cover plate away from the flexible display panel through the third adhesive layer; The second functional film layer further includes a first buffer layer and a patterned metal layer, wherein the first buffer layer is located on a side of the first supporting back film away from the flexible display panel; the patterned metal layer is located on a side of the first buffer layer away from the first supporting back film; The elastic modulus of the impact absorbing layer is smaller than the elastic modulus of the flexible cover plate, and the elastic moduli of the first buffer layer and the patterned metal layer are smaller than the elastic modulus of the first supporting backing film.

7. The flexible display module according to claim 6, characterized in that: The thickness of the impact absorbing layer is 100 μm to 200 μm, and the elastic modulus of the impact absorbing layer is 10 MPa to 200 MPa; The thickness of the third adhesive layer is 10 μm to 50 μm, and the elastic modulus of the third adhesive layer is 20 MPa to 100 MPa; The thickness of the first buffer layer is 80 μm to 120 μm, the thickness of the patterned metal layer is 100 μm to 200 μm, and the elastic modulus of the first buffer layer and the patterned metal layer is 10 MPa to 200 MPa.

8. The flexible display module according to claim 6, characterized in that: The material of the flexible cover plate and the first supporting back film comprises polyimide organic material; The material of the impact absorbing layer includes polyurethane organic material; and the materials of the first adhesive layer, the second adhesive layer, and the third adhesive layer include optical adhesive or pressure-sensitive adhesive; The material of the first buffer layer includes foam, and adhesive materials are arranged on both sides of the foam to respectively adhere to the first supporting back film and the patterned metal layer; the material of the patterned metal layer includes stainless steel.

9. The flexible display module according to claim 6, characterized in that: The second functional film layer further includes a second buffer layer, and the second buffer layer is located on a side of the patterned metal layer away from the first buffer layer; Wherein, the elastic modulus of the second buffer layer is smaller than the elastic modulus of the first supporting backing film.

10. The flexible display module according to claim 6, characterized in that: The patterned metal layer includes a first metal layer, a sixth adhesive layer located on a side of the first metal layer away from the first buffer layer, and a second metal layer located on a side of the sixth adhesive layer away from the first metal layer; The second metal layer includes a plurality of spaced-apart metal pattern portions, and the metal pattern portions extend in the curling axis direction of the flexible display module.

11. The flexible display module according to claim 4, characterized in that: The first functional film layer further includes a polarizer and a fourth adhesive layer, wherein the polarizer is bonded to a side of the first adhesive layer close to the flexible display panel, and is bonded to a display side of the flexible display panel through the fourth adhesive layer; The second functional film layer further includes a second supporting backing film and a fifth adhesive layer, and the second supporting backing film is bonded to the back side of the first supporting backing film through the fifth adhesive layer.

12. The flexible display module according to claim 11, characterized in that: The thickness of the polarizer and the second supporting backing film is 40 μm to 60 μm, and the elastic modulus of the polarizer and the second supporting backing film is 4 GPa to 8 GPa; The thickness of the fourth adhesive layer and the fifth adhesive layer is 10 μm to 50 μm, and the elastic modulus of the fourth adhesive layer and the fifth adhesive layer is 20 MPa to 100 MPa.

13. The flexible display module according to claim 12, characterized in that: The material of the second supporting backing film includes polyimide organic material, and the materials of the fourth adhesive layer and the fifth adhesive layer include optical adhesive or pressure-sensitive adhesive.

14. The flexible display module according to any one of claims 1 to 3, characterized in that: The first functional film layer includes a polarizer and a fourth adhesive layer, and the polarizer is adhered to the display side of the flexible display panel through the fourth adhesive layer; The second functional film layer includes a second supporting back film and a fifth adhesive layer, and the second supporting back film is adhered to the back side of the flexible display panel through the fifth adhesive layer.

15. An electronic device, characterized in that: A flexible display module comprising any one of claims 1 to 14.

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