A flexible display panel and a display device

Abstract

The application provides a flexible display panel and a display device, and relates to the technical field of display. The flexible display panel comprises a back film and a substrate arranged on one side of the back film. The flexible display panel has a main structure area, a binding area and a bending area between the main structure area and the binding area. The main structure area comprises a display area and an encapsulation area surrounding the display area. The substrate comprises a first metal layer. The orthographic projection of the first metal layer on the back film is located inside the orthographic projection of the encapsulation area on the back film. The first metal layer is connected to the binding area through the bending area. The surface of the flexible display panel further comprises a cutting boundary. The cutting boundary is located on at least one side of the encapsulation area away from the display area. The orthographic projection of the cutting boundary on the back film is located inside the orthographic projection of the first metal layer on the back film. The flexible display panel forms a carbonization area at the cutting boundary. The carbonization area is electrically connected to the first metal layer.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display, in particular, to a flexible display panel and a display device. BACKGROUND

[0002] With the development of self-luminous display technology, such as OLED (Organic Light-Emitting Diode), QLED (Quantum Dot Light Emitting Diodes) and Micro LED (Micro Light Emitting Diodes) display panels, etc., due to their good flexibility, high contrast and lighter and thinner characteristics, they have become the research focus of people, especially flexible display panels are more and more widely used in various fields.

[0003] However, under the effect of electrostatic field, the cover plate of the flexible display panel will accumulate electric charge, and transfer from the edge to the pixel of the display unit along the module line, so that the thin film transistor cannot work normally under the given standard voltage, causing the electrostatic field of the edge of the flexible display panel to be green serious, thereby causing the flexible display panel to display green locally, and the display picture to have low gray scale and other adverse phenomena. Therefore, how to avoid the local green of the flexible display panel has become a problem to be solved in the current field. SUMMARY

[0004] Embodiments of the present application provide a flexible display panel and a display device, aiming to solve the problem of how to avoid the local green of the flexible display panel.

[0005] The first aspect of the embodiments of the present application provides a flexible display panel, which comprises a back film and a substrate arranged on one side of the back film.

[0006] The flexible display panel has a main structure area, a binding area and a bending area between the main structure area and the binding area, the main structure area includes a display area and an encapsulation area surrounding the display area;

[0007] The substrate includes a first metal layer, the orthographic projection of the first metal layer on the back film is located inside the orthographic projection of the encapsulation area on the back film, and the first metal layer connects the binding area through the bending area.

[0008] The surface of the flexible display panel also includes a cutting boundary, which is located on at least one side of the packaging area away from the display area. The orthographic projection of the cutting boundary on the back film is located inside the orthographic projection of the first metal layer on the back film. The flexible display panel forms a carbonized zone at the cutting boundary, and the carbonized zone is electrically connected to the first metal layer.

[0009] In an optional embodiment, the flexible display panel further includes an inorganic material layer, and the flexible display panel further includes:

[0010] an inorganic material layer, the inorganic material layer being disposed on a side of the substrate facing away from the back film;

[0011] An organic material layer is provided on a side of the inorganic material layer facing away from the back film, and the organic material layer and the back film form the carbonized area at the cutting boundary.

[0012] In an optional embodiment, the orthographic projection of the first metal layer on the back film is a closed ring surrounding the display area.

[0013] In an optional embodiment, the orthographic projection of the first metal layer on the back film is axisymmetric.

[0014] In an optional embodiment, the orthographic projection shape of the first metal layer on the back film is a polygon, and the inner angles of the polygon are rounded.

[0015] In an optional embodiment, the flexible display panel further includes:

[0016] a gate insulating layer disposed on a side of the substrate facing away from the back film, and a gate layer disposed on a side of the gate insulating layer facing away from the back film, the gate layer comprising a first gate located in the main structure region and a second gate located in the binding region, the first metal layer being electrically connected to the first gate via a first through hole disposed on the gate insulating layer;

[0017] A second metal layer is provided on the side of the gate layer away from the back film, the orthographic projection of the second metal layer on the back film overlaps with the orthographic projection of the bending area on the back film, and the first gate and the second gate are electrically connected to the second metal layer respectively.

[0018] In an optional embodiment, the flexible display panel further includes a first barrier dam, the first barrier dam being arranged on a side of the gate layer facing away from the substrate, and an orthographic projection of the first barrier dam on the back film being located inside an orthographic projection of the encapsulation area on the back film;

[0019] The first through hole has a projection on the back film between a projection of the first blocking dam on the back film and a projection of the bending area on the back film.

[0020] In an alternative embodiment, the substrate further comprises:

[0021] a first substrate disposed on a side of the first metal layer away from the gate insulating layer; and / or

[0022] a second substrate disposed on a side of the first metal layer close to the gate insulating layer, wherein the second substrate is provided with a second through hole, a projection of the second through hole on the back film overlaps with a projection of the first through hole on the back film, so that the first metal layer forms an electrical connection with the first gate through the first through hole and the second through hole.

[0023] In an alternative embodiment, the part of the organic material layer in the main structure area comprises a plurality of organic material sub-layers, the part of the organic material layer in the bending area is disposed in the same layer and has the same material as at least one of the organic material sub-layers of the part of the organic material layer in the main structure area; wherein,

[0024] The plurality of organic material sub-layers comprise a dielectric layer, and a planarization layer, a pixel definition layer, an encapsulation layer and a protective coating layer disposed on a side of the dielectric layer away from the back film, the dielectric layer is disposed on a side of the gate layer away from the back film, and the material of the dielectric layer fills the first through hole.

[0025] In an alternative embodiment, the first metal layer has a dimension along a first direction greater than or equal to 0.4 mm and less than or equal to 0.7 mm, the first direction being the arrangement direction of the main structure area, the bending area and the binding area.

[0026] In an alternative embodiment, the first metal layer comprises at least one of molybdenum, aluminum alloy, and Ti / Al / Ti laminated metal.

[0027] In an alternative embodiment, the flexible display panel further comprises:

[0028] a frame, the frame being a structure wrapping the bending area after bending the binding area to the back of the main structure area by bending in the bending area, a projection of the frame on the back film surrounding a projection of the substrate on the back film.

[0029] A cover plate is arranged on a side of the substrate away from the back film, and a projection of the cover plate on the back film covers the frame and a projection of the substrate on the back film.

[0030] A second aspect of the embodiments of the present application provides a display device, which comprises a flexible circuit board and the flexible display panel as any one of the first aspect, and the flexible circuit board is bound with the binding area of the flexible display panel to realize electrical connection between the flexible circuit board and the flexible display panel.

[0031] Advantages:

[0032] The present application provides a flexible display panel and a display device, the flexible display panel comprises a back film and a substrate arranged on a side of the back film; the flexible display panel has a main structure area, a binding area and a bending area between the main structure area and the binding area, the main structure area comprises a display area and an encapsulation area surrounding the display area; the substrate comprises a first metal layer, a projection of the first metal layer on the back film is located inside a projection of the encapsulation area on the back film, and the first metal layer connects the binding area through the bending area; the surface of the flexible display panel further comprises a cutting boundary, the cutting boundary is located on at least one side of the encapsulation area away from the display area, a projection of the cutting boundary on the back film is located inside a projection of the first metal layer on the back film, the flexible display panel forms a carbonization area at the cutting boundary, and the carbonization area is electrically connected with the first metal layer. By arranging the first metal layer on the substrate, the electric charge accumulated in the display area due to the electrostatic field effect can be transmitted to the first metal layer at the cutting boundary and then transmitted to the binding area through the first metal layer for release, thereby avoiding the accumulation of electric charge in the display area, which causes the flexible display panel to display green locally and the display screen to have low gray scale and other adverse phenomena. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0034] Figure 1 is a top view structural schematic diagram of a flexible display panel according to an embodiment of the present application;

[0035] Figure 2 is a structural schematic diagram of A-A section of a flexible display panel according to an embodiment of the present application;

[0036] Figure 3 is a structural schematic diagram of a B-B cross section of a flexible display panel according to an embodiment of the present application.

[0037] Marker 101, main structure area; 1011, display area; 1012, packaging area; 102, bending area; 103, binding area; 104, peripheral area; 105, cutting path; 201, super-clean film; 202, substrate; 2021, first substrate; 2022, second substrate; 2023, first metal layer; 2024, first buffer layer; 2025, second buffer layer; 203, back film; 204, pixel layer; 2041, first gate insulating layer; 2042, second gate insulating layer; 2043, dielectric layer; 2044, planarization layer; 2045, second metal layer; 2046, first via hole; 2047, first barrier dam; 2048, gate layer; 205, transparent optical adhesive layer; 206, cover plate; 207, frame. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0039] Unless otherwise defined, technical terms or scientific terms used herein should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", "third" and similar terms used herein do not denote any order, quantity, or importance, but are used to distinguish one element from another. Similarly, the terms "one", "another", and similar terms do not denote a quantity of two or more, but rather denote the presence of at least one. The terms "include", "comprise", and similar terms are intended to mean that the elements or objects listed after the terms "include" or "comprise" and similar terms encompass the elements or objects listed and equivalents thereof, and do not exclude other elements or objects. The terms "connected" or "coupled" and similar terms are not limited to physical or mechanical connections or couplings, but can include electrical connections or couplings, whether direct or indirect. The terms "upper", "lower", "left", "right", and similar terms are used only to indicate relative positions, and when the absolute positions of the described objects are changed, the relative positions may also be changed accordingly.

[0040] With the development of self-luminous display technology, such as OLED (Organic Light-Emitting Diode) display panels, QLED (Quantum Dot Light Emitting Diodes) display panels, Micro LED (Micro Light Emitting Diodes) display panels, etc., they have become a research hotspot due to their good flexibility, high contrast and lighter weight. In particular, flexible display panels are increasingly used in various fields.

[0041] In the related art, in order to obtain a larger screen-to-body ratio and provide users with a good visual experience, setting a narrow frame has become a trend in flexible display panels. By covering the bending area of ​​the flexible display panel with a narrow frame with a width less than or equal to 0.3mm, the strength and sealing performance of the display device are improved, thereby making the dust and water resistance of the limiting device better. Here, the width dimension refers to the distance between the edge of the cover (Cover) and the protective adhesive layer (Micro Cover Layer, MCL) of the bending area. However, the flexible display panel with a narrow frame also brings the risk of low reliability. Under the electrostatic field effect, charge will accumulate on the cover of the flexible display panel and transfer from the edge along the module line to the pixel of the display unit, making the thin film transistor unable to work normally under the established standard voltage, causing the electrostatic field at the edge of the flexible display panel to turn green seriously, resulting in the flexible display panel showing local green, the display screen showing low grayscale and other undesirable phenomena.

[0042] In view of this, an embodiment of the present application proposes a flexible display panel. Figure 1 FIG. 1 shows a schematic diagram of a top view of a flexible display panel proposed in an embodiment of the present application. Figure 1 As shown, the flexible display panel has a main structure area 101, a binding area 103, and a bending area 102, wherein the bending area 102 is located between the main structure area 101 and the binding area 103. The main structure area 101 includes a display area 1011 located in the center, and an encapsulation area 1012 arranged around the display area 1011. The encapsulation area 1012 is used to block other areas of the non-display area from being connected to the display area 1011, forming a good water vapor barrier and effectively protecting the pixel structure inside the display area 1011.

[0043] In an embodiment of the present application, the flexible display panel is a single flexible display panel obtained by laser cutting. Before cutting, the flexible display panel also has a peripheral area 104 and a cutting path 105. The peripheral area 104 is arranged around the main structure area 101, the binding area 103 and the bending area 102; the cutting path 105 is located at the junction of the main structure area 101 and the peripheral area 104. The cutting path 105 is used for cutting during production, usually using a laser to cut along the cutting path 105 to form a single flexible display panel for subsequent processing. Since the flexible display panel forms a cutting boundary at the cutting path 105 during the process of cutting the flexible display panel along the cutting path 105, the organic material at the cutting path 105 will form a carbonized area due to laser cutting, so that the hierarchical structure connected to the carbonized area can conduct electric charge through the carbonized area located at the cutting boundary.

[0044] Figure 2 FIG. 1 shows a schematic structural diagram of a flexible display panel AA cross section proposed in an embodiment of the present application. Figure 2 As shown, in the embodiment of the present application, the flexible display panel includes: a back film (BF) 203; a substrate 202, the substrate 202 is arranged on one side of the back film 203; a pixel layer 204, the pixel layer 204 is arranged on the side of the substrate 202 away from the back film 203; a transparent optical adhesive layer 205, the transparent optical adhesive layer 205 is arranged on the side of the pixel layer 204 away from the back film 203; a cover plate 206, the cover plate 206 is arranged on the side of the substrate 202 away from the back film 203, optionally, the cover plate 206 can be a glass cover plate; a frame 207, the frame 207 is a structure that wraps the bending area 102 after bending when the bending area 102 is bent to the back of the main structure area 101 by bending. The orthographic projection of the frame 207 on the back film 203 surrounds the orthographic projection of the substrate 202 on the back film 203. The orthographic projection of the cover plate 206 on the back film 203 covers the frame 207 and the orthographic projection of the substrate 202 on the back film 203 .

[0045] When the cover plate 206 surface induces a positive voltage, the positive induced electric field makes the TFT more stable. The main material of the cover plate 206 is Si, and a SiO2 coating layer is formed on the surface. When the display screen is in contact with the outside world and generates friction, because the frame 207 is a bending area protection adhesive layer, the surface impedance is high, and the cover plate 206 is easy to generate static electricity, and the voltage is a negative voltage, and the pressure value range is about -100V to -1000V. The negative static electricity on the surface of the cover plate 206 is kept for a long time, so that the static electric field formed by the negative voltage induced on the surface of the cover plate 206 conducts the charge on the cover plate 206 to the transparent optical adhesive layer 205 and the pixel layer 204 along the carbonized area at the cutting boundary formed by the cutting path 105. The pixel layer 204 adopts a P-type thin film transistor, and the long-term accumulation of charge in the pixel layer 204 will increase the number of hole carriers of the P-type thin film transistor, and the driving voltage Vth is easy to be positively offset, resulting in an increase in leakage current. When the driving voltage Vth is greater than the standard threshold value, display abnormalities occur. Under the influence of the static electric field, the thin film transistor of the pixel layer 204 cannot work normally under the specified standard voltage, and after a long period of accumulation, the leakage current of the thin film transistor is continuously increased; the gate drive circuit GOA is disabled or the current control of the pixel layer 204 display pixels is abnormal, thereby causing panel timing abnormalities, and the screen cannot normally display pictures; also makes the ratio of the display unit red, green and blue RGB pixels out of adjustment, locally displays green, and the display picture appears low gray scale phenomenon.

[0046] In the embodiment of the present application, the substrate 202 includes a first metal layer 2023, and a projection of the first metal layer 2023 on the back film 203 is located inside a projection of the packaging area 1012 on the back film 203. A projection of the cutting path 105 on the back film 203 is located inside a projection of the first metal layer 2023 on the back film 203.

[0047] In the embodiment of the present application, the cutting boundary formed by laser cutting of the cutting path 105 is located at at least one side of the packaging area 1012 away from the display area 1011, the orthographic projection of the cutting boundary on the back film 203 is located inside the orthographic projection of the first metal layer 2023 on the back film 203, the flexible display panel forms a carbonization area at the cutting boundary, and the carbonization area forms an electrical connection with the first metal layer 2023. In the embodiment of the present application, the first metal layer 2023 is arranged in the substrate 202, and the first metal layer forms an electrical charge path with the carbonization area of the cutting boundary formed by laser cutting of other materials at the cutting path 105. The electrical charge originally accumulated at the pixel layer 204 can be conducted to the first metal layer 2023. The first metal layer 2023 is connected to the binding area 103 through the bending area 102, so that the electrical charge is not excessively accumulated at the pixel layer 204, but is transmitted to the binding area 103 through the electrical charge path between the first metal layer 2023 and the binding area 103 to be released, thereby avoiding the local green phenomenon and other adverse phenomena of the flexible display panel.

[0048] In an alternative embodiment, the orthographic projection of the first metal layer 2023 on the back film 203 is a closed ring surrounding the display area 1011. Preferably, the orthographic projection of the first metal layer 2023 on the back film 203 is axisymmetric; the orthographic projection of the first metal layer 2023 on the back film 203 is a polygon, and the internal angle of the polygon is a rounded angle.

[0049] In an alternative embodiment, in order to ensure that the first metal layer 2023 does not extend into the display area 1011, thereby causing electrical field interference to the driving circuit of the pixel unit, and at the same time, ensure the conduction effect of the first metal layer 2023 on the electrical charge in the pixel layer 204, in the embodiment of the present application, the size of the first metal layer 2023 in the first direction is greater than or equal to 0.4 mm and less than or equal to 0.7 mm, and the first direction is the arrangement direction of the main body structure area 101, the bending area 102 and the binding area 103.

[0050] In an alternative embodiment, the material of the first metal layer 2023 includes at least one of molybdenum, aluminum alloy, and Ti / Al / Ti laminated metal.

[0051] Specifically, Figure 3 A structure diagram of a B-B cross section of a flexible display panel according to an embodiment of the present application is shown in FIG. 2B. As shown in FIG. 2B, the flexible display panel includes a substrate 202, a pixel layer 204, a first metal layer 2023, a back film 203, a cutting path 105, a display area 1011, a packaging area 1012, a main body structure area 101, a bending area 102 and a binding area 103. Figure 3As shown, the pixel layer 204 includes an inorganic material layer, which at least includes a gate insulating layer, a gate layer 2048, and a second metal layer 2045. The gate insulating layer is disposed on the side of the substrate 202 away from the back film 203, and includes a first gate insulating layer 2041 and a second gate insulating layer 2042 stacked together. The gate layer 2048 is disposed on the side of the second gate insulating layer 2042 away from the back film 203, and includes a first gate electrode in the main body structure area 101 and a second gate electrode in the binding area 103. The second metal layer 2045 is disposed on the side of the gate layer 2048 away from the back film 203, and the orthogonal projection of the second metal layer 2045 on the back film 203 overlaps with the orthogonal projection of the bending area 102 on the back film 203. The first gate electrode and the second gate electrode are electrically connected to the second metal layer, respectively.

[0052] The first through hole 2046 is disposed on the gate insulating layer, and the orthogonal projection of the first through hole 2046 on the back film 203 overlaps with the orthogonal projection of the first metal layer 2023 on the back film 203, so that the first metal layer 2023 is electrically connected to the first gate electrode through the first through hole 2046 disposed on the gate insulating layer. The first gate electrode is overlapped with the second metal layer 2045 in the packaging area 1012. The second metal layer 2045 extends from the bending area 102 to the binding area 103 and is overlapped with the second gate electrode in the binding area 103, so that the accumulated electric charge of the pixel layer 204 is transmitted to the binding area 103 through the above-mentioned channel.

[0053] In an optional embodiment, the material of the second metal layer 2025 includes at least one of molybdenum, aluminum alloy, and Ti / Al / Ti laminated metal. Preferably, the material of the second metal layer 2025 is the same as the material of the first metal layer 2023.

[0054] In an optional embodiment, the flexible display panel further comprises a first barrier dam 2047 disposed on a side of the gate layer 2048 away from the substrate 202, and a projection of the first barrier dam 2047 on the back film 203 is located inside a projection of the encapsulation area 1012 on the back film 203. By disposing the first barrier dam 2047, water and oxygen are blocked, and the OLED device located in the display area 1011 is protected. In order to ensure that the first barrier dam 2047 effectively blocks the display area 1012 and effectively ensures the encapsulation of the encapsulation area 1012, prevents the display area 1012 from having black spots, generating water vapor and other adverse phenomena, in the embodiment of the application, a projection of the first through hole 2046 on the back film 203 is located between a projection of the first barrier dam 2047 on the back film 203 and a projection of the bending area 102 on the back film 203.

[0055] In the embodiment of the application, the substrate 202 can include a single-layer substrate, and the first metal layer 2023 is disposed on one side of the substrate. The substrate can also include at least two layers of substrates disposed along the thickness direction of the substrate, and the first metal layer 2023 is disposed between the two adjacent layers of substrates. In an optional embodiment, the substrate 202 includes a first substrate 2021 disposed on a side of the first metal layer 2023 away from the first gate insulating layer 2041, and the first metal layer 2023 is connected to the first gate through the first through hole 2046 disposed on the gate insulating layer.

[0056] In an optional embodiment, the substrate 202 includes a second substrate 2022 disposed on a side of the first metal layer 2023 close to the first gate insulating layer 2041, wherein the second substrate 2022 is provided with a second through hole, and a projection of the second through hole on the back film 203 overlaps with a projection of the first through hole 2046 on the back film 203, so that the first metal layer 2023 is electrically connected to the first gate through the first through hole 2046 disposed on the gate insulating layer and the second through hole disposed on the second substrate 2022.

[0057] In an optional embodiment, the substrate 202 includes a first substrate 2021 and a second substrate 2022, the first substrate 2021 is arranged on a side of the first metal layer 2023 away from the gate insulating layer, the second substrate 2022 is arranged on a side of the first metal layer 2023 close to the gate insulating layer, and the first metal layer 2023 is arranged between the first substrate 2021 and the second substrate 2022. The second substrate 2022 is provided with a second through hole, and a projection of the second through hole on the back film 203 overlaps with a projection of the first through hole 2046 on the back film 203, so that the first metal layer 2023 is electrically connected to the first gate through the first through hole 2046 arranged on the gate insulating layer and the second through hole arranged on the second substrate 2022.

[0058] In an optional embodiment, when the substrate 202 includes the first substrate 2021 and / or the second substrate 2022, the substrate 202 is further provided with a first buffer layer 2024 and / or a second buffer layer 2025, the first buffer layer 2024 is arranged between the first substrate 2021 and the first metal layer 2023, and the second buffer layer 2025 is arranged between the second substrate 2022 and the first gate insulating layer 2041.

[0059] Optionally, the first substrate 2021 and the second substrate 2022 can be flexible substrates, so that the flexible display panel has a bendable performance and can be switched from an unfolded state to a folded state by a bending mode. The first substrate 2021 and the second substrate 2022 can be polyimide (PI) layers.

[0060] In the embodiment of the present application, the flexible display panel further includes an organic material layer and a super clean foam (SCF) 201. The organic material layer is arranged on a side of the inorganic material layer away from the back film 203, the organic material layer, the back film 203 and the super clean foam 201 form the carbonization area at the cutting boundary, and the first metal layer 2023 is electrically connected through the carbonization area. The part of the organic material layer in the main structure area 101 includes multiple organic material sub-layers, and the part of the organic material layer in the bending area 102 is arranged in the same layer and has the same material as at least one organic material sub-layer of the part of the organic material layer in the main structure area 101. The super clean foam 201 is arranged on a side of the back film 203 away from the inorganic material layer, the super clean foam can buffer the stress acting on the flexible display panel and dissipate the heat generated during the operation of the flexible display panel, thereby protecting the flexible display panel.

[0061] In an optional embodiment, the plurality of organic material sub-layers can include: an inter layer dielectric (ILD) 2043 disposed on a side of the gate layer 2048 facing away from the back film 203, the material of the inter layer dielectric 2043 filling the first through hole 2046; a planarization layer (PLN) 2044 on a side of the inter layer dielectric 2043 facing away from the back film 203; a pixel definition layer (PDL), an encapsulation layer (IJP), and an overcoat layer (OC).

[0062] It should be noted that the material of the organic material layer in the embodiments of the present application includes organic material sub-layers, and the material of the organic material sub-layers is not specifically limited. The above is only an example given to enable those skilled in the art to better understand the scheme of the present application, and those skilled in the art can understand that the organic material layer located in the bending area 102 can be a combination of any one or more organic material sub-layers in the part of the organic material layer located in the main structure area 101, or a combination of a single layer material or a multi-layer material prepared by all possible organic materials in any proportion.

[0063] Based on the same inventive concept, the embodiments of the present application disclose a display device, which comprises a flexible circuit board and a flexible display panel as described in the embodiments of the present application, the flexible circuit board is bound with the binding area 103 of the flexible display panel to realize the electrical connection between the flexible circuit board and the flexible display panel.

[0064] In the embodiments of the present application, the flexible printed circuit (FPC) is electrically connected with the connecting member of the binding area 103 and is bound to the pixels of the display area through the FOP (FPC On Panel) process. The accumulated electric charge in the pixel layer 204 is transmitted to the binding area 103 through the first metal layer 2023 and the second metal layer 2045 through the bending area 102, and is conducted to the pin of the flexible circuit board through the connecting member in the binding area 103, and the release of the accumulated electric charge is realized through the copper foil on the flexible circuit board, avoiding the transfer of the electric charge to the pixel layer 204 and the cover plate 206 to form an electric field and interfere with the characteristics of the edge pixels TFT in the display area 1011, thereby avoiding the green screen edge defect.

[0065] The application provides a flexible display panel and a display device. The flexible display panel comprises a back film and a substrate arranged on one side of the back film; the flexible display panel has a main structure area, a binding area and a bending area between the main structure area and the binding area, the main structure area comprises a display area and an encapsulation area surrounding the display area; the substrate comprises a first metal layer, a projection of the first metal layer on the back film is located inside a projection of the encapsulation area on the back film, and the first metal layer is connected to the binding area through the bending area; the surface of the flexible display panel further comprises a cutting boundary, the cutting boundary is located on at least one side of the encapsulation area away from the display area, a projection of the cutting boundary on the back film is located inside a projection of the first metal layer on the back film, the flexible display panel forms a carbonization area at the cutting boundary, and the carbonization area is electrically connected to the first metal layer. By arranging the first metal layer on the substrate, the electric charge accumulated in the display area due to the electrostatic field effect can be transmitted to the first metal layer at the cutting boundary, and then transmitted to the binding area through the first metal layer for release, so that the accumulation of electric charge in the display area is avoided, and the flexible display panel does not appear local green display, and the display screen does not appear low gray scale and other adverse phenomena.

[0066] Each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0067] The device embodiments described above are only schematic, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, that is, they can be located in one place, or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0068] As used herein, "one embodiment", "an embodiment", or "one or more embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the disclosure. Moreover, it is to be understood that the appearances of the phrase "in one embodiment" in various places in this specification are not necessarily all referring to the same embodiment.

[0069] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the disclosure can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the specification.

[0070] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word comprising does not exclude the presence of elements or steps not listed in a claim. The word a or an preceding an element does not exclude the presence of a plurality of such elements. The disclosure can be implemented by means of both hardware and software, and any combinations thereof. In a unit claim, several devices can be listed with a conjunction and a single device can be claimed. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. The use of relative terms in the claims (for example, using "comprising", "containing" "including", "carrying" "having", "being adapted to", "arranged to", "configured to", "compared to" and the like) should not be construed in an exclusive or exhaustive sense. The word "comprise", "comprising" and "comprises" and the like are to be construed in an inclusive sense, as opposed to an exclusive or exhaustive sense.

[0071] Finally, it should be noted that the above embodiments are merely used to illustrate the technical solutions of the present disclosure, rather than limiting them; although the foregoing disclosure has been made in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

[0072] The above provides a flexible display panel and a display device, which are described in detail. The principles and implementation manners of the present application are described by using specific examples. The above embodiment is only used to help understand the method and core idea of the present application. For those skilled in the art, according to the idea of the present application, the specific implementation manner and application range can be changed. The above description should not be understood as limiting the present application.

Claims

1. A flexible display panel, characterized in that: The flexible display panel includes a back film, a substrate arranged on one side of the back film, and a pixel layer; The flexible display panel comprises a main structure area, a binding area, and a bending area located between the main structure area and the binding area, wherein the main structure area includes a display area and a packaging area surrounding the display area; The substrate includes a first metal layer, the orthographic projection of the first metal layer on the back film is located inside the orthographic projection of the packaging area on the back film, and the first metal layer is connected to the binding area through the bending area; The surface of the flexible display panel further includes a cutting boundary, the cutting boundary is located on at least one side of the encapsulation area away from the display area, the orthographic projection of the cutting boundary on the back film is located inside the orthographic projection of the first metal layer on the back film, and the flexible display panel forms a carbonized area at the cutting boundary, and the carbonized area is electrically connected to the first metal layer; The pixel layer is arranged on a side of the substrate away from the back film, and the pixel layer includes an inorganic material layer, and the inorganic material layer includes at least a gate insulating layer, a gate layer and a second metal layer; The gate insulating layer is arranged on a side of the substrate away from the back film, the gate layer is arranged on a side of the gate insulating layer away from the back film, the gate layer includes a first gate located in the main structure area and a second gate located in the binding area, and the first metal layer is electrically connected to the first gate via a first through hole provided on the gate insulating layer; The second metal layer is arranged on the side of the gate layer away from the back film, the orthographic projection of the second metal layer on the back film overlaps with the orthographic projection of the bending area on the back film, and the first gate and the second gate are electrically connected to the second metal layer respectively.

2. The flexible display panel according to claim 1, wherein: The flexible display panel further includes: An organic material layer is provided on a side of the inorganic material layer facing away from the back film, and the organic material layer and the back film form the carbonized area at the cutting boundary.

3. The flexible display panel according to claim 1, wherein: The orthographic projection of the first metal layer on the back film is a closed ring surrounding the display area.

4. The flexible display panel according to claim 1, wherein: The orthographic projection of the first metal layer on the back film is axially symmetrical.

5. The flexible display panel according to claim 1, wherein: The orthographic projection shape of the first metal layer on the back film is a polygon, and the inner angles of the polygon are rounded.

6. The flexible display panel according to claim 1, wherein: The flexible display panel further includes a first barrier dam, which is arranged on a side of the gate layer facing away from the substrate, and an orthographic projection of the first barrier dam on the back film is located inside an orthographic projection of the encapsulation area on the back film; The orthographic projection of the first through hole on the back film is located between the orthographic projection of the first blocking dam on the back film and the orthographic projection of the bending area on the back film.

7. The flexible display panel according to claim 1, wherein: The substrate further comprises: a first substrate, the first substrate being arranged on a side of the first metal layer away from the gate insulating layer; and / or a second substrate, wherein the second substrate is arranged on a side of the first metal layer close to the gate insulating layer, wherein a second through hole is provided on the second substrate, and the orthographic projection of the second through hole on the back film overlaps with the orthographic projection of the first through hole on the back film, so that the first metal layer is electrically connected to the first gate through the first through hole and the second through hole.

8. The flexible display panel according to claim 2, wherein: The portion of the organic material layer located in the main structure area includes multiple organic material sublayers, and the portion of the organic material layer located in the bending area and at least one of the organic material sublayers located in the portion of the organic material layer located in the main structure area are arranged in the same layer and made of the same material; wherein, The multilayer organic material sublayer includes: a dielectric layer, and a planarization layer, a pixel definition layer, an encapsulation layer and a coating protection layer arranged on the side of the dielectric layer away from the back film. The dielectric layer is arranged on the side of the gate layer away from the back film, and the material of the dielectric layer fills the first through hole.

9. The flexible display panel according to any one of claims 1 to 8, wherein: The size of the first metal layer along a first direction is greater than or equal to 0.4 mm and less than or equal to 0.7 mm. The first direction is the arrangement direction of the main structure area, the bending area, and the binding area.

10. The flexible display panel according to any one of claims 1 to 8, characterized in that: The first metal layer includes at least one of the following: molybdenum, aluminum alloy, and Ti / Al / Ti stacked metal.

11. The flexible display panel according to any one of claims 1 to 8, wherein: The flexible display panel further includes: a frame, wherein the frame is a structure that wraps the bent area when the binding area is bent to the back of the main structure area by bending in the bending area, and the orthographic projection of the frame on the back film surrounds the orthographic projection of the substrate on the back film; A cover plate is provided on a side of the substrate facing away from the back film, and the orthographic projection of the cover plate on the back film covers the frame and the orthographic projection of the substrate on the back film.

12. A display device, characterized in that: The display device includes a flexible circuit board and the flexible display panel according to any one of claims 1 to 11, wherein the flexible circuit board is bound to the binding area of ​​the flexible display panel to achieve electrical connection between the flexible circuit board and the flexible display panel.

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