Flexible display module and device

Abstract

Embodiments of the present disclosure disclose a flexible display module and a device. In an embodiment, the flexible display module comprises a support layer, a back film, a flexible display panel and a cover plate which are sequentially stacked; the flexible display panel comprises a display area and a first opening, the display area surrounds the first opening; the back film comprises a second opening, a normal projection of the second opening on the cover plate covers a normal projection of the first opening on the cover plate; the support layer comprises a third opening, a normal projection of the third opening on the cover plate covers a normal projection of the second opening on the cover plate, and an area of the normal projection of the third opening on the cover plate is greater than an area of the normal projection of the second opening on the cover plate; the flexible display module further comprises a first buffer layer, the first buffer layer respectively abuts to a part of the back film exposed by the third opening and the support layer.

Description

Technical Field

[0001] This disclosure relates to the field of display technology. More specifically, it relates to a flexible display module and device. Background Technology

[0002] Currently, flexible display modules typically use flexible organic light-emitting diode (OLED) display panels. Flexible OLED display panels are widely used in smart terminal products such as mobile phones and tablets. Due to their ease of customization, more and more terminal manufacturers are applying them to full-screen and bezel-less products. Because full-screen and bezel-less products require a larger light-emitting area, holes are usually needed in the flexible display module to accommodate hardware such as front-facing cameras, earpieces, and power buttons. The inventors discovered that the holes in the flexible display module often result in a "Grow Dark Spot in the Hole" (GDSH) phenomenon, affecting the reliability of flexible display products. Summary of the Invention

[0003] The purpose of this disclosure is to provide a flexible display module and device to solve at least one of the problems existing in the prior art.

[0004] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0005] The first aspect of this disclosure provides a flexible display module, including a support layer, a back film, a flexible display panel, and a cover plate stacked sequentially.

[0006] The flexible display panel includes a display area and a first opening, wherein the display area surrounds the first opening;

[0007] The back film includes a second opening, the orthographic projection of the second opening on the cover plate covering the orthographic projection of the first opening on the cover plate;

[0008] The support layer includes a third opening, the orthographic projection of the third opening on the cover plate covers the orthographic projection of the second opening on the cover plate, and the area of ​​the orthographic projection of the third opening on the cover plate is greater than the area of ​​the orthographic projection of the second opening on the cover plate.

[0009] The flexible display module further includes a first buffer layer, which abuts against the portion of the back film exposed by the third opening on the side facing the support layer and the support layer.

[0010] Optionally, the support layer includes a first metal layer and a first adhesive layer. The first adhesive layer is used to bond the first metal layer to the back film. The first adhesive layer includes a first sub-opening, and the first metal layer includes a second sub-opening. The first sub-opening and the second sub-opening constitute the third opening. The area of ​​the orthographic projection of the first sub-opening on the cover plate is greater than the area of ​​the orthographic projection of the second sub-opening on the cover plate.

[0011] Optionally, the support layer further includes a second metal layer and a second adhesive layer located on the side of the first metal layer opposite to the back film. The second adhesive layer is used to bond the second metal layer to the first metal layer. The second adhesive layer includes a third sub-opening, and the second metal layer includes a fourth sub-opening. The first sub-opening, the second sub-opening, the third sub-opening, and the fourth sub-opening constitute the third opening. The area of ​​the orthographic projection of the fourth sub-opening on the cover plate is greater than the area of ​​the orthographic projection of the second sub-opening on the cover plate and smaller than the area of ​​the orthographic projection of the third sub-opening on the cover plate.

[0012] Optionally, the first buffer layer is a first adhesive layer that covers the sidewall of the support layer forming the third opening and the portion of the back film exposed by the third opening on the side facing the support layer.

[0013] Optionally, the first buffer layer is a first adhesive layer, which covers the sidewall of the support layer forming the third opening and the portion of the back film exposed by the third opening on the side facing the support layer, and the first adhesive layer fills the gap between the portion of the back film exposed by the third opening on the side facing the support layer and the portion of the first metal layer exposed by the first sub-opening on the side facing the back film.

[0014] Optionally, the first buffer layer is a first adhesive layer, which covers the sidewall of the support layer forming the third opening and the portion of the back film exposed by the third opening on the side facing the support layer. The first adhesive layer fills the gap between the portion of the back film exposed by the third opening on the side facing the support layer and the portion of the first metal layer exposed by the first sub-opening on the side facing the back film, and the gap between the portion of the first metal layer exposed by the third sub-opening on the side facing the second metal layer and the portion of the second metal layer exposed by the third sub-opening on the side facing the first metal layer.

[0015] Optionally, the first adhesive layer also covers the sidewall of the back film forming the second opening and the sidewall of the flexible display panel forming the first opening.

[0016] Optionally, the first buffer layer is a first septum layer, which includes a first septum portion and a second septum portion. The first septum portion is bonded to the portion of the back film exposed by the third opening on the side facing the support layer, and the second septum portion is bonded to the side of the support layer away from the back film.

[0017] Optionally, the first spacer portion and the second spacer portion are integrally formed.

[0018] A second aspect of this disclosure provides a flexible display device, including the flexible display module provided in the first aspect of this disclosure.

[0019] The beneficial effects of this disclosure are as follows:

[0020] The technical solution described in this disclosure can effectively improve the mechanical strength of the opening area of ​​the flexible display module through the first buffer layer, protect the flexible display panel in the opening area, and prevent the flexible display panel from being deformed by pressure and damaged by the support layer when the opening area is pressed by external force. This effectively reduces the risk of cracking of the flexible display panel in the opening area, effectively improves the black spot (GDSH) phenomenon in the opening area, and improves the reliability of the flexible display module. Attached Figure Description

[0021] The specific embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0022] Figure 1 This diagram shows a top view of the light-emitting side of the flexible display module provided in the embodiments of this disclosure in its unfolded state.

[0023] Figure 2 Show Figure 1 A cross-sectional schematic diagram of the opening area of ​​the flexible display module shown.

[0024] Figure 3 Show Figure 1 Another cross-sectional view of the opening area of ​​the flexible display module shown.

[0025] Figure 4 Show Figure 1 Another cross-sectional view of the opening area of ​​the flexible display module shown. Detailed Implementation

[0026] The terms “on”, “formed on”, and “set on” used in this disclosure can indicate that one layer is directly formed or set on another layer, or that one layer is indirectly formed or set on another layer, meaning that there are other layers between the two layers.

[0027] It should be noted that although the terms "first," "second," etc., may be used herein to describe various components, members, elements, regions, layers, and / or parts, these components, members, elements, regions, layers, and / or parts should not be limited by these terms. Rather, these terms are used to distinguish one component, member, element, region, layer, and / or part from another. Thus, for example, the first component, first member, first element, first region, first layer, and / or first part discussed below may be referred to as a second component, second member, second element, second region, second layer, and / or second part without departing from the teachings of this disclosure.

[0028] In this disclosure, unless otherwise stated, the term "co-layer arrangement" means that two layers, components, members, elements, or portions can be formed by the same fabrication process (e.g., patterning process), and that the two layers, components, members, elements, or portions are generally formed of the same material. For example, co-layer arrangement of two or more functional layers means that these co-layer functional layers can be formed using the same material layers and the same fabrication process, thereby simplifying the fabrication process of the display substrate.

[0029] In this disclosure, unless otherwise stated, the term "patterning process" generally includes steps such as photoresist coating, exposure, development, etching, and photoresist stripping. The term "one-step patterning process" refers to a process that uses a photomask to form patterned layers, components, or parts.

[0030] The inventors discovered that dark spots (GDSH) often occur in the opening areas of flexible display modules, affecting the reliability of flexible display products.

[0031] The inventors investigated the causes of black spots in the perforated areas of flexible display modules and found the following: For flexible display products, especially outward-folding displays, resistance to compression and drops are crucial performance indicators. High-strength support layers (Bracket, BKT) are typically used. However, because the support layer also has perforations in the perforated areas, the mechanical strength of these areas is lower than other areas. Therefore, during the use of flexible display products, when users wipe the screen or press the perforated areas forcefully, the flexible display panel in these areas (i.e., the edge of the flexible display panel near the perforations) is easily deformed and damaged by the support layer on the backlight side. This increases the risk of cracking in the perforated areas, leading to the formation of black spots (GDSH) in these areas.

[0032] In view of this, the present disclosure provides a flexible display module, including a support layer, a back film, a flexible display panel and a cover plate stacked sequentially;

[0033] The flexible display panel includes a display area and a first opening, wherein the display area surrounds the first opening;

[0034] The back film includes a second opening, the orthographic projection of the second opening on the cover plate covering the orthographic projection of the first opening on the cover plate;

[0035] The support layer includes a third opening, the orthographic projection of the third opening on the cover plate covers the orthographic projection of the second opening on the cover plate, and the area of ​​the orthographic projection of the third opening on the cover plate is greater than the area of ​​the orthographic projection of the second opening on the cover plate.

[0036] The flexible display module further includes a first buffer layer, which abuts against the portion of the back film exposed by the third opening on the side facing the support layer and the support layer.

[0037] Therefore, by setting a first buffer layer that abuts against the back film and the support layer respectively, this embodiment can effectively improve the mechanical strength of the opening area of ​​the flexible display module, protect the flexible display panel in the opening area, and prevent the flexible display panel from being deformed by pressure and damaged by the support layer when the opening area is pressed by external force. This effectively reduces the risk of cracking of the flexible display panel in the opening area, effectively improves the black spot (GDSH) phenomenon in the opening area, and improves the reliability of the flexible display module.

[0038] It should be noted that although the back film can also play a certain protective role, the back film made of materials such as polyimide (PI) is relatively thin, usually only 50μm-60μm thick. Therefore, when the opening area is subjected to external pressure, the risk of the flexible display panel being damaged by the support layer due to pressure deformation cannot be eliminated by the back film alone.

[0039] In this embodiment, the second opening of the back film is created, for example, by simultaneously cutting the first opening of the flexible display panel and the second opening of the back film using a laser cutting process after the back film is bonded to the flexible display panel. Thus, the orthographic projections of the first opening of the flexible display panel and the second opening of the back film onto the cover plate coincide. As for the support layer, it is prepared, for example, by bonding it to the back film after creating the third opening. Therefore, the area of ​​the orthographic projection of the third opening of the support layer onto the cover plate is larger than the area of ​​the orthographic projection of the second opening of the back film onto the cover plate. That is, the diameter of the third opening of the support layer is larger than the diameters of the first opening of the flexible display panel and the second opening of the back film, to avoid the first and second openings being obstructed due to bonding tolerances between the support layer and the back film.

[0040] In one possible implementation, the support layer includes a first metal layer and a first adhesive layer, the first adhesive layer being used to bond the first metal layer to the back film, the first adhesive layer including a first sub-aperture, the first metal layer including a second sub-aperture, the first sub-aperture and the second sub-aperture constituting the third opening, the area of ​​the orthographic projection of the first sub-aperture on the cover plate being greater than the area of ​​the orthographic projection of the second sub-aperture on the cover plate.

[0041] Furthermore, in one possible implementation, the support layer further includes a second metal layer and a second adhesive layer located on the side of the first metal layer opposite to the back film. The second adhesive layer is used to bond the second metal layer to the first metal layer. The second adhesive layer includes a third sub-aperture, and the second metal layer includes a fourth sub-aperture. The first sub-aperture, the second sub-aperture, the third sub-aperture, and the fourth sub-aperture constitute the third opening. The area of ​​the orthographic projection of the fourth sub-aperture on the cover plate is greater than the area of ​​the orthographic projection of the second sub-aperture on the cover plate and smaller than the area of ​​the orthographic projection of the third sub-aperture on the cover plate.

[0042] In a specific example, for example Figure 1 and Figure 2 As shown, the flexible display module provided in this embodiment includes a support layer 201, a back film 202, a flexible display panel 203 and a cover plate 204 stacked in sequence. The support layer 201 includes a second metal layer 2014, a second adhesive layer 2013, a first metal layer 2012 and a first adhesive layer 2011 stacked in sequence.

[0043] For example Figure 2 As shown, the light-emitting side of the flexible display panel 203 is... Figure 2 On the upper side of the flexible display panel 203 shown, the cover plate 204 does not have an opening. For example, the installation position of hardware such as the front-facing camera is in the projection area of ​​the first opening on the side of the cover plate 204 facing the flexible display panel 203.

[0044] For example Figure 1 As shown, the first opening of the flexible display panel 203 is, for example, circular. Alternatively, it can be a regular or irregular shape such as rectangular, elliptical, or U-shaped. Correspondingly, the second opening of the back film 202 and the third opening of the support layer 204 (including the first sub-opening of the first adhesive layer 2011, the second sub-opening of the first metal layer 2012, the third sub-opening of the second adhesive layer 2013, and the fourth sub-opening of the second metal layer 2014) respectively match the shape of the first opening of the flexible display panel 203, and their centers coincide. This coincidence refers to coincidence within a certain tolerance range (the adhesion tolerance between the support layer 204 and the back film 202).

[0045] For example Figure 2 As shown, the area of ​​the orthographic projection of the fourth sub-aperture of the second metal layer 2014 onto the cover plate 204 is larger than the area of ​​the orthographic projection of the second sub-aperture of the first metal layer 2012 onto the cover plate 204 and smaller than the area of ​​the orthographic projection of the third sub-aperture of the second adhesive layer 2013 onto the cover plate 204. The area of ​​the orthographic projection of the first sub-aperture of the first adhesive layer 2011 onto the cover plate 204 is larger than the area of ​​the orthographic projection of the second sub-aperture of the first metal layer 2012 onto the cover plate 204. The area of ​​the third opening of the support layer 204, which is formed by the first sub-opening of the adhesive layer 2011, the second sub-opening of the first metal layer 2012, the third sub-opening of the second adhesive layer 2013, and the fourth sub-opening of the second metal layer 2014, is larger than the area of ​​the second opening of the back film 202 on the cover plate 204. The orthogonal projections of the first opening of the flexible display panel 203 and the second opening of the back film 202 on the cover plate 204 coincide (have the same area).

[0046] Continuing with the previous example, the first metal layer 2012 and the second metal layer 2014 can be made of stainless steel (SUS), titanium alloy, or other metal materials, or materials with high modulus properties such as carbon fiber. The materials of the first adhesive layer 2011 and the second adhesive layer 2013 are, for example, optically transparent adhesive (OCA).

[0047] In one possible implementation, the first buffer layer is a first adhesive layer that covers the sidewall of the support layer forming the third opening and the portion of the back film exposed by the third opening on the side facing the support layer.

[0048] In one possible implementation, the first buffer layer is a first adhesive layer that covers the sidewall of the support layer forming the third opening and the portion of the back film exposed by the third opening on the side facing the support layer, and the first adhesive layer fills the gap between the portion of the back film exposed by the third opening on the side facing the support layer and the portion of the first metal layer exposed by the first sub-opening on the side facing the back film.

[0049] In one possible implementation, the first buffer layer is a first adhesive layer that covers the sidewall of the support layer forming the third opening and the portion of the back film exposed by the third opening on the side facing the support layer. The first adhesive layer fills the gap between the portion of the back film exposed by the third opening on the side facing the support layer and the portion of the first metal layer exposed by the first sub-opening on the side facing the back film, and the gap between the portion of the first metal layer exposed by the third sub-opening on the side facing the second metal layer and the portion of the second metal layer exposed by the third sub-opening on the side facing the first metal layer.

[0050] Continuing with the previous example, for example Figure 2 As shown, the first adhesive layer 205 covers the sidewall of the support layer 201 that forms the third opening, and also covers the portion of the back film 202 exposed by the third opening on the side facing the support layer 201. Figure 2 As shown, the first adhesive layer 205 fills the gap between the portion of the back film 202 exposed by the first sub-opening on the side facing the support layer 201 and the portion of the first metal layer 2012 exposed by the first sub-opening on the side facing the back film 202, and fills the gap between the portion of the first metal layer 2012 exposed by the third sub-opening on the side facing the second metal layer 2014 and the portion of the second metal layer 2014 exposed by the third sub-opening on the side facing the first metal layer 2012.

[0051] Continuing with the previous example, the first adhesive layer 205 is formed, for example, in the bonding section of the support layer 201, after the support layer 201 is bonded to the back film 202, by a dispensing process and is subject to incoming quality control (IQC) inspection.

[0052] The design of the first adhesive layer 205 can form a buffer in the gap between the back film 202 and the support layer 204, thereby effectively improving the mechanical strength of the opening area of ​​the flexible display module, protecting the flexible display panel 203 in the opening area, and preventing the flexible display panel 203 from being deformed by pressure and damaged by the support layer 201 when the opening area is pressed by external force.

[0053] In one possible implementation, the first adhesive layer also covers the sidewall of the back film forming the second opening and the sidewall of the flexible display panel forming the first opening.

[0054] In a specific example, with Figure 2 The first adhesive layer 205 shown is different, for example, Figure 3 The first adhesive layer 205' shown also covers the sidewall of the back film 202 forming the second opening and the sidewall of the flexible display panel 203 forming the first opening. Therefore, the first adhesive layer 205' not only acts as a buffer between the back film 202 and the support layer 204, but also reinforces and encapsulates the flexible display panel 203, reducing the risk of peeling and enhancing the barrier against moisture penetration. It effectively mitigates the GDSH (great spots caused by cracking) phenomenon in the opening area of ​​the flexible display panel, and also effectively reduces the GDSH phenomenon caused by moisture penetration and corrosion of the circuitry in the flexible display panel 203.

[0055] In one possible implementation, the first adhesive layer is a photocurable adhesive layer.

[0056] Continuing with the previous example, the first adhesive layer 205 or 205ˋ is, for example, a UV-curable adhesive. Compared to other types such as thermosetting adhesives, the curing process of UV-curable adhesives does not damage the flexible display panel. Therefore, this implementation uses a UV-curable adhesive layer as the first adhesive layer.

[0057] Besides the aforementioned implementation where the first buffer layer is a first adhesive layer, in another possible implementation, the first buffer layer is a first spacer layer. This first spacer layer includes a first spacer portion and a second spacer portion. The first spacer portion is bonded to the portion of the back film exposed by the third opening on the side facing the support layer, and the second spacer portion is bonded to the side of the support layer opposite to the back film. Therefore, when the opening area is subjected to external pressure, the first spacer layer can absorb the force and provide a buffering effect, thereby preventing the flexible display panel from being deformed by pressure and damaged by the support layer.

[0058] In one possible implementation, the first spacer portion and the second spacer portion are integrally formed.

[0059] The first septum layer can be called an annular gasket, and in a specific example, for example... Figure 4 As shown, the cross-section of the first spacer layer 401 is two mirrored L-shapes. The vertical part of the L-shape is the first spacer part, and the horizontal part is the second spacer part. The top surface of the first spacer part is bonded to the part of the back film 203 exposed by the third opening on the side facing the support layer 201 by double-sided adhesive, for example. The top surface of the second spacer part is bonded to the bottom surface of the second metal layer 2014 by double-sided adhesive, for example.

[0060] In one possible implementation, the material of the first spacer layer is a polyethylene terephthalate (PET) plastic, polyurethane, or acrylic.

[0061] For example Figure 4 As shown, the material of the first spacer layer 401 is polyethylene terephthalate (PET), polyurethane (PU), or acrylic (PMMA).

[0062] The following is a description of the cover plate, flexible display panel, and back film in the flexible display module provided in this embodiment.

[0063] Continuing with the previous example, the cover plate 204 is, for example, a flexible cover plate, which may be a composite structure including film layers of materials such as colorless polyimide (CPI), ultra-thin glass (UTG), transparent optical adhesive (OCA), polyethylene terephthalate (PET), thermoplastic polyurethane (TPU), etc. It should be noted that the cover plate 204 does not have openings.

[0064] Continuing with the previous example, the back film 202 is, for example, a polyimide (PI) material, which serves to protect the flexible display panel 203.

[0065] Continuing with the previous example, the flexible display panel 203 is, for example, a flexible OLED display panel, which includes a flexible substrate and film layers such as a driving circuit layer, an anode, a light-emitting device layer, a cathode, and an encapsulation layer formed on the flexible substrate.

[0066] Flexible substrates can be made of materials such as polyimide (PI), polyethylene naphthalate (PEN), and thermoplastic polyester (PET). For example, flexible OLED display panels may also include a barrier layer and a buffer layer located between the substrate and the driving circuit layer. For example, the barrier layer and buffer layer can be formed entirely on the substrate. For example, the barrier layer can be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride, and the buffer layer can also be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride. The barrier layer helps prevent water and oxygen from entering the OLED from the bottom. The buffer layer improves the quality of subsequent material deposition.

[0067] The driving circuit layer, also known as the thin-film transistor (TFT) layer, includes an active layer formed on a buffer layer using a patterning process; a gate insulating layer (GI) formed on the active layer by deposition or other methods; the gate of the TFT formed on the gate insulating layer using a patterning process; a dielectric layer (ILD) formed on the gate by deposition or other methods; a source / drain metal layer formed on the dielectric layer; and a planarization layer (PLN) covering the source / drain metal layer and the exposed dielectric layer. The source / drain metal layer forms the source and drain of the TFT. For example, the source is electrically connected to the active layer through a via in the dielectric layer. The active layer can be made of materials such as polysilicon and metal oxides. The gate insulating layer can be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride. The dielectric layer can also be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride. The gate material includes metals or alloys such as aluminum, titanium, and cobalt. The planarization layer is, for example, an organic material.

[0068] The anode is, for example, a metal oxide such as ITO or IZO, or a metal or alloy such as Ag, Al, or Mo. The anode is electrically connected to the drain through a via formed in the planarization layer.

[0069] The pixel defining layer can be formed using a patterning process and surrounds the anode. For example, the material of the pixel defining layer may include organic insulating materials such as negative photoresist, polyimide, and epoxy resin.

[0070] The light-emitting device layer is formed, for example, on the anode exposed by an opening in the pixel defining layer. The light-emitting device layer includes an emissive layer (EML), for example, different color sub-pixels have different emissive layers; for example, red sub-pixels include a red emissive layer, green sub-pixels include a green emissive layer, and blue sub-pixels include a blue emissive layer. The light-emitting device layer may also include an auxiliary emissive layer that facilitates the emission of the emissive layer. The auxiliary emissive layer may include, for example, one or more films selected from the following: a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EIL), a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL). The emissive layer and the auxiliary emissive layer are, for example, organic material layers.

[0071] The cathode can be formed on the entire surface of a flexible OLED display panel, covering the light-emitting device layer and the pixel defining layer. The cathode material can include metals such as Mg, Ca, Li or Al or their alloys, or metal oxides such as IZO or ZTO, or organic materials with conductive properties such as PEDOT / PSS (poly(3,4-ethylenedioxythiophene / polystyrene sulfonate)).

[0072] The encapsulation layer (TFE) is located on the cathode. For example, the encapsulation layer includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer. For example, the first and second inorganic encapsulation layers are formed by deposition or other methods. The organic encapsulation layer is formed by inkjet printing. For example, the first and second inorganic encapsulation layers can be formed using inorganic materials such as silicon nitride, silicon oxide, and silicon oxynitride, while the organic encapsulation layer can be formed using organic materials such as polyimide (PI) and epoxy resin. Thus, the first inorganic encapsulation layer, the organic encapsulation layer, and the second inorganic encapsulation layer form a composite encapsulation layer. This composite encapsulation layer provides multiple layers of protection for the functional structure of the display panel, resulting in better encapsulation performance.

[0073] In some embodiments of this disclosure, other necessary functional film layers may be formed in the display area as needed, which will not be described in detail here.

[0074] Another embodiment of this disclosure provides a flexible display device, including the aforementioned flexible display module. The display device can be any product or component with display functionality, such as a mobile phone or tablet computer; this embodiment does not limit its application to this type of device.

[0075] Obviously, the above embodiments of this disclosure are merely examples for clearly illustrating this disclosure, and are not intended to limit the implementation of this disclosure. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all implementation methods here. Any obvious variations or modifications derived from the technical solutions of this disclosure are still within the protection scope of this disclosure.

Claims

1. A flexible display module, characterized in that, It includes a support layer, a back film, a flexible display panel, and a cover plate that are stacked in sequence. The flexible display panel includes a display area and a first opening, wherein the display area surrounds the first opening; The back film includes a second opening, the orthographic projection of the second opening on the cover plate covering the orthographic projection of the first opening on the cover plate; The support layer includes a third opening, the orthographic projection of the third opening on the cover plate covers the orthographic projection of the second opening on the cover plate, and the area of ​​the orthographic projection of the third opening on the cover plate is greater than the area of ​​the orthographic projection of the second opening on the cover plate. The flexible display module further includes a first buffer layer, which abuts against the portion of the back film exposed by the third opening on the side facing the support layer and the support layer. The support layer includes a first metal layer and a first adhesive layer. The first adhesive layer is used to bond the first metal layer to the back film. The first adhesive layer includes a first sub-opening. The first metal layer includes a second sub-opening. The first sub-opening and the second sub-opening constitute the third opening. The area of ​​the orthographic projection of the first sub-opening on the cover plate is greater than the area of ​​the orthographic projection of the second sub-opening on the cover plate. The support layer further includes a second metal layer and a second adhesive layer located on the side of the first metal layer opposite to the back film. The second adhesive layer is used to bond the second metal layer to the first metal layer. The second adhesive layer includes a third sub-opening, and the second metal layer includes a fourth sub-opening. The first sub-opening, the second sub-opening, the third sub-opening, and the fourth sub-opening constitute the third opening. The area of ​​the orthographic projection of the fourth sub-opening on the cover plate is larger than the area of ​​the orthographic projection of the second sub-opening on the cover plate and smaller than the area of ​​the orthographic projection of the third sub-opening on the cover plate. The first buffer layer is a first adhesive layer. The first adhesive layer covers the sidewall of the support layer forming the third opening and the portion of the back film exposed by the third opening on the side facing the support layer. The first adhesive layer fills the gap between the portion of the back film exposed by the third opening on the side facing the support layer and the portion of the first metal layer exposed by the first sub-opening on the side facing the back film, and the gap between the portion of the first metal layer exposed by the third sub-opening on the side facing the second metal layer and the portion of the second metal layer exposed by the third sub-opening on the side facing the first metal layer.

2. The flexible display module according to claim 1, characterized in that, The first buffer layer is a first adhesive layer, which covers the sidewall of the support layer forming the third opening and the portion of the back film exposed by the third opening on the side facing the support layer.

3. The flexible display module according to claim 1, characterized in that, The first buffer layer is a first adhesive layer, which covers the sidewall of the support layer forming the third opening and the portion of the back film exposed by the third opening on the side facing the support layer. The first adhesive layer fills the gap between the portion of the back film exposed by the third opening on the side facing the support layer and the portion of the first metal layer exposed by the first sub-opening on the side facing the back film.

4. The flexible display module according to claim 2 or 3, characterized in that, The first adhesive layer also covers the sidewall of the back film forming the second opening and the sidewall of the flexible display panel forming the first opening.

5. The flexible display module according to claim 1, characterized in that, The first buffer layer is a first septum layer, which includes a first septum portion and a second septum portion. The first septum portion is bonded to the portion of the back film exposed by the third opening on the side facing the support layer, and the second septum portion is bonded to the side of the support layer away from the back film.

6. The flexible display module according to claim 5, characterized in that, The first spacer portion and the second spacer portion are integrally formed.

7. A flexible display device, characterized in that, Includes the flexible display module as described in any one of claims 1-6.

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