Folding display panel, display device and electronic equipment

Abstract

The invention provides a folding display panel, which comprises a touch panel layer, an isolation layer and a transmission layer, the isolation layer is laminated on the touch panel layer, and the isolation layer is an organic layer coated on the touch panel layer; the transmission layer is stacked on the surface, away from the touch panel layer, of the isolation layer, and the transmission layer is an organic layer coated on the isolation layer. The invention further provides a display device provided with the folding display panel and electronic equipment provided with the display device.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a folding display panel, a display device provided with the folding display panel, and an electronic device provided with the display device. Background Art

[0002] At present, folding display screens are one of the development trends of new forms of portable electronic devices. This portable electronic device can not only improve portability, but also enable users to enjoy the advantages of a large screen after the folding display screen is unfolded. Therefore, major mobile phone manufacturers are competing to release folding screen mobile phones. With the development of folding screen mobile phones becoming thinner and lighter, the thickness of the entire folding screen mobile phone can also be comparable to that of a straight-screen phone. However, due to the bending feature of folding screen mobile phones, the thickness of the folding display screen module is continuously compressed, and the strength of the folding display screen module will decrease as its thickness decreases, which can easily cause the problem of failed film layer after the portable electronic device falls. Summary of the invention

[0003] An object of the present invention is to provide a foldable display panel with better reliability, a display device provided with the foldable display panel, and an electronic device provided with the display device.

[0004] In order to solve the above technical problems, the present invention provides a folding display panel, which includes a touch panel layer, an isolation layer and a transmission layer, the isolation layer is stacked on the touch panel layer, and the isolation layer is an organic layer coated on the touch panel layer; the transmission layer is stacked on the surface of the isolation layer away from the touch panel layer, and the transmission layer is an organic layer coated on the isolation layer.

[0005] The present invention also provides a display device, which includes a folding display panel, the folding display panel including a touch panel layer, an isolation layer and a transmission layer, the isolation layer is stacked on the touch panel layer, and the isolation layer is an organic layer coated on the touch panel layer; the transmission layer is stacked on the surface of the isolation layer facing away from the touch panel layer, and the transmission layer is an organic layer coated on the isolation layer.

[0006] The present invention also provides an electronic device, which includes a folding shell and a display device, wherein the display device includes a folding display panel, and the folding display panel includes a touch panel layer, an isolation layer and a transmission layer, wherein the isolation layer is stacked on the touch panel layer, and the isolation layer is an organic layer coated on the touch panel layer; the transmission layer is stacked on the surface of the isolation layer facing away from the touch panel layer, and the transmission layer is an organic layer coated on the isolation layer; the display device is arranged on the folding shell, and the display device can be folded as the folding shell is folded.

[0007] The transmission layer and the isolation layer in the folding display panel of the present application are both made of organic layers. Since the tensile strength of the organic layer is greater than that of the inorganic layer, the film layers of the folding display panel are not easy to break, thereby improving the reliability and extrusion performance of the folding display panel to protect the folding display panel from damage when it accidentally falls or is impacted by external forces, and reducing the probability of failure of the film layers of the folding display panel after falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 is a schematic diagram of a foldable display panel provided in accordance with a first embodiment of the present invention.

[0010] Figure 2 yes Figure 1 Further illustration of the folding display panel in FIG.

[0011] Figure 3 yes Figure 1 The folded display panel in the clamp spacing test table.

[0012] Figure 4 yes Figure 1 The crush test sheet of the folded display panel.

[0013] Figure 5 yes Figure 1 Schematic diagram of the partial structure of the foldable display panel.

[0014] Figure 6 yes Figure 5 Schematic diagram of adding a first protective layer to the folding display panel.

[0015] Figure 7 is a schematic diagram of a foldable display panel provided by a second embodiment of the present invention.

[0016] Figure 8 is a schematic diagram of a display device of the present invention.

[0017] Fig. 9 It is a schematic diagram of the three-dimensional structure of an electronic device provided by one embodiment of the present invention.

[0018] Fig.10 yes Fig. 9 Schematic diagram of the three-dimensional structure of the electronic device in the folded state.

[0019] Description of main reference numerals: 100, folding display panel; 20, light-emitting device panel layer; 22, flexible substrate; 24, light-emitting material layer; 30, thin film encapsulation layer; 40, touch panel layer; 50, isolation layer; 52, tooth groove; 60, transmission layer; 62, first optically transparent adhesive film; 63, bridge; 64, second optically transparent adhesive film; 65, barrier layer; 66, flat layer; 67, gap; 70, covering layer; 72, receiving groove; 80, first protective layer; 90, supporting sheet; 110, buffer layer; 120, second protective layer; 130, polyimide film; 200, display device; 210, folding area; 220, flat area; 300, electronic device; 310, folding shell; 312, shell; 314, folding device. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In addition, the following descriptions of the various embodiments are made with reference to the attached drawings to illustrate specific embodiments that the present application may be implemented in. Directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0022] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set on..." should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] See also Figure 1The folding display panel 100 provided in the first embodiment of the present invention includes a light-emitting device panel layer 20, a thin film encapsulation layer 30, a touch panel layer 40, an isolation layer 50 and a transmission layer 60, the thin film encapsulation layer 30 covers the front surface of the light-emitting device panel layer 20, the touch panel layer 40 is stacked on the front surface of the thin film encapsulation layer 30, the thin film encapsulation layer 30 is located between the light-emitting device panel layer 20 and the touch panel layer 40, and the thin film encapsulation layer 30 can protect the light-emitting device panel layer 20 to prevent the light-emitting device panel layer 20 from being affected by external water and air; The thin film encapsulation layer 30 also provides a flat bearing surface for the touch panel layer 40, and the touch panel layer 40 is directly manufactured on the thin film encapsulation layer 30 using the same process as that for preparing the functional film layer in the display panel, which simplifies the process, saves costs, and improves reliability; the isolation layer 50 is stacked on the surface of the touch panel layer 40 that is away from the thin film encapsulation layer 30, and the isolation layer 50 is an organic layer coated on the touch panel layer 40; the transmission layer 60 is stacked on the surface of the isolation layer 50 that is away from the touch panel layer 40, and the transmission layer 60 is an organic layer coated on the isolation layer 50.

[0024] Compared with the prior art, in which both the transmission layer and the isolation layer in the folding display panel are made of inorganic material layers, the transmission layer 60 and the isolation layer 50 in the folding display panel 100 of the present application are made of organic layers, which are directly realized by a film forming method without plasma chemical vapor deposition. Since the tensile strength of the organic layer is greater than the tensile strength of the inorganic layer, the film layers of the folding display panel 100 are not easy to break, which improves the reliability and extrusion performance of the folding display panel 100, so as to protect the folding display panel 100 from damage when it is accidentally dropped or impacted by external forces, and reduce the failure probability of the film layers of the folding display panel 100 after falling.

[0025] It can be understood that the light-emitting device panel layer 20 is a display panel layer made by organic electroluminescent technology. The display panel introduces an organic light-emitting layer between two electrodes. When current passes through, the materials in the organic light-emitting layer will emit light. These organic materials can emit light of different colors, so they can display full-color images. The thin film encapsulation layer 30 is made by flexible encapsulation technology and is used to encapsulate the light-emitting device panel layer 20 to protect the light-emitting device panel layer 20 from water and oxygen erosion while maintaining the flexibility and foldability of the folding display panel 100; the thin film encapsulation layer 30 is usually composed of a multi-layer film, and the thin film encapsulation layer 30 may include an inorganic layer and an organic layer. The inorganic layer is usually a silicon nitride or silicon oxynitride inorganic film prepared by plasma chemical vapor deposition technology, and the inorganic layer has a high water and oxygen barrier capacity; the organic layer is mainly a transparent polymer film prepared by inkjet printing technology, which has a high defect coverage and stress buffering performance. In this embodiment, the thin film encapsulation layer 30 and the touch panel layer 40 are both organic layers. The isolation layer 50 is an organic transparent conductive layer, which is located between the touch panel layer 40 and the transmission layer 60. The organic transparent conductive layer is used for conducting electricity and preventing light leakage, and can ensure that the folding display panel 100 will not leak light when folded, ensuring the normal operation of the folding display panel 100. The transmission layer 60 is a touch sensing layer in the folding display panel 100, which is used to detect the touch operation of the operator and convert these operations into electrical signals to be transmitted to the processor for processing. The film forming method refers to the coating being applied to the base material through a coating process, and forming a protective film after drying and curing.

[0026] like Figure 2As shown, the light-emitting device panel layer 20 includes a flexible substrate 22 and a light-emitting material layer 24 stacked on the flexible substrate 22. The flexible substrate 22 is made of a flexible material. The flexible substrate 22 has high flexibility, lightness, transparency, stretchability and mechanical strength, and can withstand multiple bending without damage. The flexible material can be but is not limited to PI polyimide, polyvinyl alcohol (PVA), polyester (PET), etc. The flexible substrate 22 is used to provide support and protection for the circuit, while allowing the circuit board to be bent and folded, and is suitable for application scenarios where frequent bending of the foldable display panel 100 is required. In this embodiment, the flexible substrate 22 is made of polyimide material. The flexible substrate 22 can provide flexibility and ductility of the foldable display panel 100, and can withstand large deformation without damaging the electronic performance on the screen. The light-emitting material layer 24 is an organic light-emitting layer. In this embodiment, the light-emitting material layer 24 is an active matrix organic light-emitting diode panel. The light-emitting material layer 24 can emit light when current can pass to produce the display function of the screen. The light-emitting material layer 24 can withstand frequent bending and folding. On the surface of the light-emitting material layer 24 away from the flexible substrate 22, a thin film encapsulation layer 30 and a touch panel layer 40 are formed by evaporation encapsulation, so that the thin film encapsulation layer 30 is located between the touch panel layer 40 and the light-emitting material layer 24; specifically, evaporation encapsulation is used to manufacture self-luminous pixels that can generate light and color. The evaporation process is carried out in a vacuum state, and a precision metal mask is used to ensure that the organic material is deposited in a specific position to form red (R), green (G) and blue (B) organic light-emitting layers. Specifically, vacuum evaporation is a method of evaporating the evaporated material into atoms or molecules in a vacuum through current heating, electron beam bombardment heating or laser heating, and then these atoms or molecules condense on the surface of the substrate to form a thin film. An isolation layer 50 of organic material is directly formed by film formation on the surface of the touch panel layer 40 away from the light-emitting device panel layer 20. The transmission layer 60 is stacked on the surface of the isolation layer 50 away from the touch panel layer 40. The side of the transmission layer 60 close to the isolation layer 50 is provided with a sensing channel Rx, a driving channel Tx, and a bridge 63 connected between two adjacent driving channels Tx. A sensing channel Rx is provided between two adjacent driving channels Tx. A stable capacitor is formed between the sensing channel Rx and the driving channel Tx, and the entire capacitive screen is a capacitor. When the user's finger touches the transmission layer 60, the finger is equivalent to the third conductor, forming a new capacitor. The control chip of the folding display panel 100 determines the specific location of the touch by detecting the changed capacitance value.

[0027] Since the tensile strength of the organic layer is better than that of the inorganic layer, after the folding display panel 100 is dropped or bent with a large deformation, the transmission layer 60 and the isolation layer 50 are not easily broken, thereby preventing the touch panel layer 40 from breaking. Figure 3The test results of the sandwich panel spacing of the folding display panel 100 shown in the figure show that: when both the transmission layer and the isolation layer are inorganic layers, the spacing of the flexible display panel monomer is 4.8CM, and the spacing of the module monomer is 4.8cm; the transmission layer and the isolation layer of the folding display panel 100 of the present application are both organic layers, the spacing of the flexible display panel monomer is 3.6CM, and the spacing of the module monomer is 3.5cm. Therefore, after both the transmission layer and the isolation layer are organic layers, compared with the transmission layer and the isolation layer are both inorganic layers, the distance between the transmission layer monomer and the module sandwich panel of the outer folding sandwich panel spacing is reduced by 25%-27%.

[0028] like Figure 4 As shown, the extrusion test table of the folding display panel 100 shows that: when both the transmission layer and the isolation layer are inorganic layers, the extrusion pressure in the soft-pressing bending zone is 220N, and the extrusion pressure in the hard-pressing bending zone is 30N; when both the transmission layer and the isolation layer of the folding display panel 100 of the present application are organic layers, the extrusion pressure in the soft-pressing bending zone is 160N, and the extrusion pressure in the hard-pressing bending zone is 26N. Therefore, after both the transmission layer and the isolation layer are organic layers, the extrusion pressure in the soft-pressing bending zone is less than the extrusion pressure in the soft-pressing bending zone after both the transmission layer and the isolation layer are inorganic layers, and the extrusion pressure in the hard-pressing bending zone after both the transmission layer and the isolation layer are organic layers is less than the extrusion pressure in the hard-pressing bending zone after both the transmission layer and the isolation layer are inorganic layers.

[0029] like Figure 5 and Figure 6 As shown, the folding display panel 100 further includes a covering layer 70, which covers the surface of the transmission layer 60 away from the isolation layer 50. In this embodiment, the covering layer 70 is a COC film, which is a cyclic olefin copolymer film. The covering layer 70 has high transparency, so that the covering layer 70 can provide a clear visual effect in the folding display panel 100, ensuring the display quality of the folding display panel 100; the covering layer 70 has anti-ultraviolet properties to protect the internal structure of the folding display panel 100 from ultraviolet damage, thereby extending the service life of the folding display panel 100; the covering layer 70 has excellent chemical stability, so that the covering layer 70 can resist the erosion of various chemical substances and maintain the stability of the folding display panel 100; the covering layer 70 also has anti-pollution properties to prevent dust and dirt from adhering to the folding display panel 100, keeping the folding display panel 100 clean and functioning normally.

[0030] Optionally, the folding display panel 100 further includes a first protective layer 80, which is located between the covering layer 70 and the transmission layer 60, and is made of an inorganic transparent material. Since the front of the transmission layer 60 is covered with the first protective layer 80, the anti-extrusion effect of the bending area on the front of the folding display panel 100 is better, and the reliability of the folding display panel 100 is further improved. In this embodiment, the first protective layer 80 is a COE barrier film, that is, the first protective layer 80 is a color film encapsulation barrier film that acts as a polarizer to improve the light efficiency and contrast of the folding display panel 100.

[0031] Optionally, a receiving groove 72 is provided on the surface of the cover layer 70 facing the transmission layer 60, and the first protective layer 80 is received in the receiving groove 72. Since the first protective layer 80 is received in the receiving groove 72, the overall thickness of the folding display panel 100 is not increased, so that the folding display panel 100 maintains a relatively thin thickness.

[0032] like Figure 5 and Figure 6 As shown, the transmission layer 60 includes a first optically transparent adhesive film 62 and a second optically transparent adhesive film 64, a barrier layer 65 and a flat layer 66, which are stacked on the isolation layer 50, and the barrier layer 65 is spaced from the flat layer 66. The first optically transparent adhesive film 62 covers the surface of the barrier layer 65 and the flat layer 66 away from the isolation layer 50, and the second optically transparent adhesive film 64 covers the side of the first optically transparent adhesive film 62 away from the isolation layer 50, and the first protective layer 80 is stacked on the second optically transparent adhesive film 64. There is a gap 67 between the barrier layer 65 and the flat layer 66, and the first optically transparent adhesive film 62 fills the gap 67. The barrier layer 65 is usually made of a material with a large band gap, and is located between the quantum well layers or between the quantum well layer and the cladding layer; the main function of the barrier layer 65 is to form an energy barrier, effectively preventing the flow of electrons and holes between different layers, thereby controlling the distribution of carriers in the quantum well. The energy barrier can help reduce the emission threshold current of the laser, improve the spectral purity and beam quality of the laser, and protect the quantum well structure to prevent damage during preparation or operation. The adhesive of the first optical transparent adhesive film 62 and the second optical transparent adhesive film 64, the middle of which is an optical acrylic pressure-sensitive adhesive without a substrate, and the upper and lower layers are optical release films, so that the first optical transparent adhesive film 62 and the second optical transparent adhesive film 64 have the advantages of high clarity, high light transmittance, high adhesion, high water resistance, high temperature resistance, and UV resistance, and will not cause yellowing, peeling, and deterioration problems after long-term use.

[0033] Optionally, at least one of the first optically transparent adhesive film 62, the second optically transparent adhesive film 64, the barrier layer 65, and the flat layer 66 is an organic layer; in this embodiment, the first optically transparent adhesive film 62, the second optically transparent adhesive film 64, the barrier layer 65, and the flat layer 66 are all organic layers. In other embodiments, the first optically transparent adhesive film 62 and the second optically transparent adhesive film 64 are respectively organic layers. In other embodiments, the barrier layer 65 and / or the flat layer 66 are organic layers.

[0034] Optionally, a surface of the isolation layer 50 facing the flat layer 66 is provided with a plurality of grooves 52 , and the flat layer 66 fills the grooves 52 , so that the connection between the transmission layer 60 and the isolation layer 50 is firm.

[0035] Optionally, the folding display panel 100 further includes a buffer layer 110, a second protective layer 120 and a polyimide film 130, the buffer layer 110 is stacked on the surface of the isolation layer 50 away from the cover layer 70, the second protective layer 120 is stacked on the surface of the buffer layer 110 away from the isolation layer 50, the polyimide film 130 covers the surface of the second protective layer 120 away from the buffer layer 110, and at least one of the touch panel layer 40, the buffer layer 110 and the second protective layer 120 is set as an organic layer. In this embodiment, the touch panel layer 40, the buffer layer 110 and the second protective layer 120 are all set as organic layers, which further improves the reliability and extrusion performance of the folding display panel 100, and further reduces the probability of a failed film layer of the folding display panel 100 after falling. The buffer layer 110 is used to enhance the durability and reliability of the folding display panel 100. The buffer layer 110 can ensure that the folding display panel 100 can withstand greater stress during folding and unfolding by adding additional buffering and protection mechanisms in the optimized circuit design and material selection, thereby reducing damage and damage caused by folding. The second protective layer 120 can enhance the durability and reliability of the folding display panel 100. The polyimide film 130 has high temperature resistance, chemical corrosion resistance, insulation and bending resistance.

[0036] The folding display panel 100 of the present application optimizes the panel stacking and sets the organic layer. Specifically, the isolation layer 50 and the transmission layer 60 of the folding display panel 100 are both set as organic layers, and a first protective layer 80 is added between the transmission layer 60 and the covering layer 70. While achieving the overall lightness and thinness of the folding display panel 100, the reliability and extrusion performance of the folding display panel 100 are improved, and the probability of a failed film layer of the folding display panel 100 after falling is reduced.

[0037] See also Figure 7The structure of the folding display panel 100a provided in the second embodiment of the present application is similar to the structure of the folding display panel 100 provided in the first embodiment, except that: the touch panel layer 40a in the folding display panel 100a of the second embodiment is set as an organic layer; that is, the touch panel layer 40a, the isolation layer 50 and the transmission layer 60 in the folding display panel 100a are respectively set as organic layers, thereby further improving the reliability and extrusion performance of the folding display panel 100a, and reducing the probability of failure of each film layer of the folding display panel 100a by falling.

[0038] In other embodiments, the insulating film layer or the supporting film layer of the light-emitting device panel 20 may be changed into an organic layer, thereby further improving the reliability and extrusion performance of the folding display panel and further reducing the probability of failure of each film layer of the folding display panel due to falling.

[0039] The present application also provides a display device, including the foldable display panel provided by any one of the above embodiments, such as Figure 8 As shown, in one embodiment, the display device 200 includes a support sheet 90 and a folding display panel 100, and the folding display panel 100 is disposed on the support sheet 90, and the support sheet 90 can be folded along with the folding of the folding display panel 100. The display device 200 in this embodiment is a folding display screen. In other embodiments, a folding display panel 100a may also be disposed on the support sheet 90. Since the folding display panel has good reliability and stability of the film structure and improves the extrusion performance, the performance of the display device 200 is stable.

[0040] like Fig. 9 and Fig.10As shown, the present application also provides an electronic device 300, which includes a folding housing 310 and a display device 200 provided in any of the above embodiments, and the display device 200 is disposed on the folding housing 310, and the display device 200 can be folded along with the folding of the folding housing 310. Specifically, the folding housing 310 includes at least two adjacent housings 312 and a folding device 314, and the two housings 312 are connected by the folding device 314 so that the two housings 312 can be folded with each other; the display device 200 includes a folding area 210 and a flat area 220 connected to opposite sides of the folding area 210, and the back of the display device 200 is connected to the front of the folding housing 310, so that the two flat areas 220 are respectively opposite to the two housings 312, and the folding area 210 is opposite to the folding area 210. When the two shells 312 are folded together by the folding device 314, the folding area 210 of the display device 200 is folded along with the folding shell 310; when the two shells 312 are flattened together by the folding device 314, the folding area 210 of the display device 200 is flattened along with the folding shell 310. The electronic device provided in the present application may be any one of a mobile phone, a tablet computer, a television, etc. In the present embodiment, the electronic device is a mobile phone.

[0041] In the electronic device 300 provided in the embodiment of the present application, the isolation layer 50 and / or the transmission layer 60 in the display device 200 is changed from an inorganic layer to an organic layer, and a first protective layer 80 is arranged between the transmission layer 60 and the covering layer 70, so that the display device 200 has good film structure stability and reliability, reduces the probability of a failed film layer in the electronic device 300 after falling, makes the performance of the electronic device 300 stable, prolongs the service life, and improves the user experience.

[0042] The above is an implementation of the embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A foldable display panel, characterized in that: The foldable display panel comprises: Touch panel layer, an isolation layer, the isolation layer being stacked on the touch panel layer, the isolation layer being an organic layer coated on the touch panel layer, and The transmission layer is stacked on the surface of the isolation layer away from the touch panel layer, and the transmission layer is an organic layer coated on the isolation layer.

2. The foldable display panel according to claim 1, characterized in that: The foldable display panel further includes a covering layer and a first protective layer. The covering layer covers a surface of the transmission layer facing away from the isolation layer, and the first protective layer is located between the covering layer and the transmission layer.

3. The foldable display panel according to claim 2, characterized in that: The first protective layer is made of an inorganic transparent material. A receiving groove is provided on the surface of the covering layer facing the transmission layer, and the first protective layer is accommodated in the receiving groove.

4. The foldable display panel according to claim 2, characterized in that: The transmission layer includes a first optically transparent adhesive film and a second optically transparent adhesive film, a barrier layer and a flat layer stacked on each other, the barrier layer and the flat layer are stacked on the isolation layer, the barrier layer and the flat layer are spaced apart, the first optically transparent adhesive film covers the surfaces of the barrier layer and the flat layer facing away from the isolation layer, the second optically transparent adhesive film covers the side of the first optically transparent adhesive film facing away from the isolation layer, and the first protective layer is stacked on the second optically transparent adhesive film.

5. The foldable display panel according to claim 4, characterized in that: At least one of the first optically transparent adhesive film, the second optically transparent adhesive film, the barrier layer, and the planar layer is an organic layer.

6. The foldable display panel according to claim 4, characterized in that: There is a gap between the blocking layer and the flat layer, and the first optically transparent adhesive film fills the gap.

7. The foldable display panel according to claim 4, characterized in that: A surface of the isolation layer facing the flat layer is provided with a plurality of grooves, and the flat layer fills the grooves.

8. The foldable display panel according to claim 1, characterized in that: The folding display panel also includes a buffer layer and a second protective layer. The buffer layer is stacked on the surface of the isolation layer away from the covering layer, and the second protective layer is stacked on the surface of the buffer layer away from the isolation layer. At least one of the touch panel layer, the buffer layer and the second protective layer is an organic layer.

9. A display device, characterized in that: The display device comprises the foldable display panel as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: The electronic device comprises a folding housing and the display device as claimed in claim 9, wherein the display device is arranged on the folding housing and can be folded along with the folding of the folding housing.

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