Flexible display panel and display device

Abstract

The invention 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 is provided with a main body structure area, a binding area and a bending area located between the main body structure area and the binding area, and the main body structure area comprises a display area and a packaging 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 in the orthographic projection of the packaging area on the back film, and the first metal layer is connected with 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, away from the display area, of the packaging area, the orthographic projection of the cutting boundary on the back film is located in the orthographic 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.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and in particular, to a flexible display panel and a display device. Background Art

[0002] With the development of self-luminous display technology, such as OLED (Organic Light-Emitting Diode) display panel, QLED (Quantum Dot Light Emitting Diodes) display panel, Micro LED (Micro Light Emitting Diodes) display panel, 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.

[0003] However, under the electrostatic field effect, charges will accumulate on the cover plate of the flexible display panel and transfer from the edge to the pixels of the display unit along the module line, 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, thus causing the flexible display panel to display green locally, and the display screen to have low grayscale and other undesirable phenomena. Therefore, how to avoid the local greening of the flexible display panel has become an urgent problem to be solved in the field. Summary of the invention

[0004] The embodiments of the present application provide a flexible display panel and a display device, aiming to solve the problem of how to avoid the flexible display panel from turning green locally.

[0005] A first aspect of an embodiment of the present application provides a flexible display panel, the flexible display panel comprising a back film and a substrate arranged on one side of the back film;

[0006] The flexible display panel comprises a main structure area, a binding area and a bending area between the main structure area and the binding area, wherein the main structure area comprises a display area and a packaging area surrounding the display area;

[0007] 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 packaging area on the back film, and the first metal layer is connected to 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, and 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 implementation, the flexible display panel further includes an inorganic material layer, and the flexible display panel further includes:

[0010] An inorganic material layer, wherein the inorganic material layer is disposed on a side of the substrate away from the back film;

[0011] An organic material layer is disposed on a side of the inorganic material layer 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 axially symmetrical.

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

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

[0016] A gate insulating layer disposed on a side of the substrate away from the back film, and a gate layer disposed on a side of the gate insulating layer away from the back film, the gate layer comprising a first gate located in the main structure area and a second gate located in the binding area, 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, wherein the second metal layer is arranged on a 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 blocking dam, the first blocking dam is arranged on a side of the gate layer away from the substrate, and an orthographic projection of the first blocking dam on the back film is located inside an orthographic projection of the encapsulation area on the back film;

[0019] 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.

[0020] In an optional embodiment, the substrate further includes:

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

[0022] A second substrate, 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 arranged 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.

[0023] In an optional embodiment, the portion of the organic material layer located in the main structure area includes multiple layers of organic material sub-layers, and the portion of the organic material layer located in the bending area and at least one layer of the organic material sub-layer of 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,

[0024] 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.

[0025] In an optional embodiment, a 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, and the first direction is an arrangement direction of the main structure area, the bending area, and the binding area.

[0026] In an optional embodiment, the first metal layer includes at least one of the following: molybdenum, aluminum alloy, and Ti / Al / Ti stacked metal.

[0027] In an optional implementation, the flexible display panel further includes:

[0028] 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;

[0029] A cover plate is arranged on a side of the substrate 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.

[0030] A second aspect of an embodiment of the present application provides a display device, comprising a flexible circuit board and a flexible display panel as described in any one of the first aspects, 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.

[0031] Beneficial effects:

[0032] The present application provides a flexible display panel and a display device, the flexible display panel includes 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 located between the main structure area and the binding area, 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 also includes a cutting boundary, the cutting boundary 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 carbonization area at the cutting boundary, and the carbonization area is electrically connected to the first metal layer. The present application arranges a first metal layer on the substrate, so that the charge accumulated in the display area due to the electrostatic field effect can be transferred to the first metal layer at the cutting boundary, and is transferred to the binding area through the first metal layer for release, thereby avoiding the accumulation of charge in the display area causing the flexible display panel to display green locally, and the display screen to display low grayscale and other undesirable phenomena. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1 is a schematic diagram of a top view structure of a flexible display panel proposed in an embodiment of the present application;

[0035] Figure 2 This is a schematic structural diagram of a flexible display panel AA cross section proposed in an embodiment of the present application;

[0036] Figure 3 1 is a schematic structural diagram of a cross-section of a flexible display panel BB proposed in an embodiment of the present application.

[0037] Explanation of the reference numerals: 101, main structure area; 1011, display area; 1012, packaging area; 102, bending area; 103, binding area; 104, peripheral area; 105, cutting path; 201, ultra-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 through hole; 2047, first blocking dam; 2048, gate layer; 205, transparent optical adhesive layer; 206, cover plate; 207, frame. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] With the development of self-luminous display technology, such as OLED (Organic Light-Emitting Diode) display panel, QLED (Quantum Dot Light Emitting Diodes) display panel, Micro LED (Micro Light Emitting Diodes) display panel, 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 for 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. The width dimension refers to the distance between the edge of the cover plate (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, charges will accumulate on the cover plate of the flexible display panel and transfer from the edge to the pixels of the display unit along the module line, 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 green locally, and the display screen showing low grayscale and other undesirable phenomena.

[0042] In view of this, an embodiment of the present application provides a flexible display panel. Figure 1 FIG. 1 shows a schematic diagram of a top view structure 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 a packaging area 1012 arranged around the display area 1011, and the packaging 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 the 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, and 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, wherein the substrate 202 is arranged on one side of the back film 203; a pixel layer 204, wherein 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, wherein 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, wherein the cover plate 206 is arranged on the side of the substrate 202 away from the back film 203, and optionally, the cover plate 206 can be a glass cover plate; a frame 207, wherein the frame 207 is a structure that wraps the bending area 102 after the bending when the bending area 102 is bent to the back side of the main structure area 101 by bending, and 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 a positive voltage is induced on the surface of the cover plate 206, the positive induced electric field makes the TFT more stable. The main material of the cover plate 206 is Si, and SiO 2Plating layer, when the display screen contacts with the outside world and generates friction, since the frame 207 is a protective adhesive layer in the bending area, the surface impedance is relatively high, and the cover plate 206 is prone to generate static electricity, and its voltage is negative voltage, and the voltage value range is about -100V to -1000V. After the negative static electricity on the surface of the cover plate 206 is maintained for a long time, the electrostatic field formed by the negative voltage is induced on the surface of the cover plate 206, and the charge on the cover plate 206 is conducted to the transparent optical adhesive layer 205 and the pixel layer 204 along the carbonized area at the cutting boundary formed by the cutting road 105. The pixel layer 204 uses a P-type thin film transistor. The charge accumulated in the pixel layer 204 for a long time will increase the number of hole carriers of the P-type thin film transistor, and the driving voltage Vth is prone to positive deviation, resulting in an increase in leakage current. When the driving voltage Vth is greater than the standard threshold, display abnormality will occur. Under the influence of the electrostatic field, the thin film transistors of the pixel layer 204 cannot work normally under the established standard voltage, and after a long period of accumulation, the leakage current of the thin film transistor continues to increase; the gate drive circuit GOA fails or the current control of the display pixel of the pixel layer 204 is abnormal, resulting in abnormal panel timing and the screen cannot display the picture normally; it also causes the ratio of the red, green and blue RGB pixels of the display unit to be unbalanced, green is displayed locally, and the display picture has a low grayscale phenomenon.

[0046] In the embodiment of the present application, the substrate 202 includes a first metal layer 2023, the orthographic projection of the first metal layer 2023 on the back film 203 is located inside the orthographic projection of the packaging area 1012 on the back film 203, and the orthographic projection of the cutting road 105 on the back film 203 is located inside the orthographic 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 the cutting road 105 is located at least on one side of the packaging area 1012 away from the display area 1011, and 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 carbonized area at the cutting boundary, and the carbonized area is electrically connected to 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 a charge path with the carbonized area of ​​the cutting boundary formed by laser cutting of other materials at the cutting road 105. The charge originally accumulated at the pixel layer 204 can be conducted to the first metal layer 2023, and the first metal layer 2023 is connected to the binding area 103 through the bending area 102, so that the charge will not be accumulated too much in the pixel layer 204, but is transferred to the binding area 103 through the charge path between the first metal layer 2023 and the binding area 103 for release, thereby avoiding undesirable phenomena such as local greening of the flexible display panel.

[0048] In an optional 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 axially symmetric; the orthographic projection of the first metal layer 2023 on the back film 203 is a polygon, and the inner angle of the polygon is rounded.

[0049] In an optional embodiment, in order to ensure that the first metal layer 2023 does not extend into the display area 1011, thereby causing electric field interference to the driving circuit of the pixel unit, while ensuring the first metal layer 2023's conduction effect on the charge in the pixel layer 204, in an embodiment of the present application, the size of the first metal layer 2023 along 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 structure area 101, the bending area 102 and the binding area 103.

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

[0051] Specifically, Figure 3 FIG. 1 shows a schematic structural diagram of a cross-section of a flexible display panel BB proposed in an embodiment of the present application. Figure 3As shown, the pixel layer 204 includes an inorganic material layer, and the inorganic material layer includes at least a gate insulating layer, a gate layer 2048 and a second metal layer 2045. The gate insulating layer is arranged 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 arranged in a stacked manner; the gate layer 2048 is arranged on the side of the second gate insulating layer 2042 away from the back film 203, and the gate layer 2048 includes a first gate located in the main structure area 101 and a second gate located in the binding area 103; the second metal layer 2045 is arranged on the side of the gate layer 2048 away from the back film 203, and the orthographic projection of the second metal layer 2045 on the back film 203 overlaps with the orthographic projection of the bending area 102 on the back film 203, and the first gate and the second gate are respectively electrically connected to the second metal layer.

[0052] Among them, a first through hole 2046 is arranged on the gate insulating layer, and the orthographic projection of the first through hole 2046 on the back film 203 overlaps with the orthographic projection of the first metal layer 2023 on the back film 203, so that the first metal layer 2023 forms an electrical connection with the first gate through the first through hole 2046 arranged on the gate insulating layer; the first gate is overlapped with the second metal layer 2045 located in the packaging area 1012, and the second metal layer 2045 extends from the bending area 102 to the binding area 103, and overlaps with the second gate located in the binding area 103, so that the accumulated charge of the pixel layer 204 is transferred to the binding area 103 through the above-mentioned path.

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

[0054] In an optional embodiment, the flexible display panel further includes a first blocking dam 2047, the first blocking dam 2047 is disposed on a side of the gate layer 2048 away from the substrate 202, and the orthographic projection of the first blocking dam 2047 on the back film 203 is located inside the orthographic projection of the encapsulation area 1012 on the back film 203. The first blocking dam 2047 is provided to block the intrusion of water and oxygen, thereby protecting the OLED device located in the display area 1011. In order to ensure the effective blocking effect of the first blocking dam 2047 on the display area 1012, effectively ensure the sealing of the encapsulation area 1012, and prevent the display area 1012 from having black spots, generating water vapor, and other undesirable phenomena, in the embodiment of the present application, the orthographic projection of the first through hole 2046 on the back film 203 is located between the orthographic projection of the first blocking dam 2047 on the back film 203 and the orthographic projection of the bending area 102 on the back film 203.

[0055] In the embodiment of the present application, the substrate 202 may include a single-layer substrate, and the first metal layer 2023 is disposed on one side of the substrate; the substrate may 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 two adjacent layers of substrates. In an optional embodiment, the substrate 202 includes a first substrate 2021, and the first substrate 2021 is 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 overlapped with the first gate through a first through hole 2046 disposed on the gate insulating layer.

[0056] In an optional embodiment, the substrate 202 includes a second substrate 2022, which is arranged on a side of the first metal layer 2023 close to the first gate insulating layer 2041, wherein a second through hole is arranged on the second substrate 2022, and the orthographic projection of the second through hole on the back film 203 overlaps with the orthographic 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.

[0057] In an optional embodiment, the substrate 202 includes a first substrate 2021 and a second substrate 2022, wherein the first substrate 2021 is disposed on a side of the first metal layer 2023 away from the gate insulating layer, the second substrate 2022 is disposed on a side of the first metal layer 2023 close to the gate insulating layer, and the first metal layer 2023 is disposed between the first substrate 2021 and the second substrate 2022. A second through hole is disposed on the second substrate 2022, and the orthographic projection of the second through hole on the back film 203 overlaps with the orthographic 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.

[0058] In an optional embodiment, when the substrate 202 includes a first substrate 2021 and / or a 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 insulation layer 2041.

[0059] Optionally, the first substrate 2021 and the second substrate 2022 may be flexible substrates, so that the flexible display panel has a bendable property and can be switched from an unfolded state to a bent state by bending. The first substrate 2021 and the second substrate 2022 may 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 film (Super Clean Foam, SCF) 201. The organic material layer is arranged on the side of the inorganic material layer away from the back film 203, and the organic material layer, the back film 203 and the super clean film 201 form the carbonization zone at the cutting boundary, and form an electrical connection with the first metal layer 2023 through the carbonization zone. Among them, the part of the organic material layer located in the main structure area 101 includes multiple layers of organic material sublayers, and the part of the organic material layer located in the bending area 102 and at least one layer of the organic material sublayer of the part of the organic material layer located in the main structure area 101 are arranged in the same layer and have the same material. The super clean film 201 is arranged on the side of the back film 203 away from the inorganic material layer. The super clean film can buffer the stress acting on the flexible display panel, and can dissipate the heat generated when the flexible display panel is working, and has a certain protective effect on the flexible display panel.

[0061] In an optional embodiment, the multilayer organic material sublayer may include: a dielectric layer 2043 (Inter Layer Dielectric, ILD), the dielectric layer 2043 is arranged on the side of the gate layer 2048 away from the back film 203, and the material of the dielectric layer 2043 fills the first through hole 2046; a planarization layer 2044 (PLN), the planarization layer 2044 is on the side of the dielectric layer 2043 away from the back film 203; a pixel definition layer (PDL), an encapsulation layer (IJP) and a coating overcoat (OC).

[0062] It should be noted that the material of the organic material sublayer included in the organic material layer described in the embodiment of the present application is not specifically limited. The above is only an example given to enable those skilled in the art to better understand the solution of the present application. 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 sublayers in the part of the organic material layer located in the main structure area 101, or a single-layer material or a combination of multiple layers of materials prepared by all possible organic materials in any proportion.

[0063] Based on the same inventive concept, an embodiment of the present application discloses a display device, which includes a flexible circuit board and a flexible display panel as described in the embodiment of the present application, wherein the flexible circuit board is bound to the binding area 103 of the flexible display panel to achieve electrical connection between the flexible circuit board and the flexible display panel.

[0064] In the embodiment of the present application, the flexible printed circuit (FPC) is electrically connected to the connector of the binding area 103 and is bound to the pixels of the display area through the FOP (FPC On Panel) process. The charges accumulated in the pixel layer 204 are transferred to the binding area 103 through the first metal layer 2023 and the second metal layer 2045 through the bending area 102, and are conducted to the pins of the flexible circuit board through the connector in the binding area 103. The accumulated charges are released by grounding the copper foil on the flexible circuit board, so as to avoid the charges being transferred to the pixel layer 204 and the cover plate 206 to form an electric field and interfere with the TFT characteristics of the edge pixels in the display area 1011, thereby avoiding the greening defect at the edge of the screen.

[0065] The present application provides a flexible display panel and a display device, the flexible display panel includes 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 located between the main structure area and the binding area, 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 also includes a cutting boundary, the cutting boundary 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 carbonization area at the cutting boundary, and the carbonization area is electrically connected to the first metal layer. The present application arranges a first metal layer on the substrate, so that the charge accumulated in the display area due to the electrostatic field effect can be transferred to the first metal layer at the cutting boundary, and is transferred to the binding area through the first metal layer for release, thereby avoiding the accumulation of charge in the display area causing the flexible display panel to display green locally, and the display screen to display low grayscale and other undesirable phenomena.

[0066] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0067] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0068] References herein to "one embodiment," "embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present disclosure. In addition, please note that examples of the term "in one embodiment" do not necessarily all refer to the same embodiment.

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

[0070] In the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present disclosure may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

[0072] The above is a detailed introduction to a flexible display panel and a display device provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A flexible display panel, characterized in that: The flexible display panel includes a back film and a substrate arranged on one side of the back film; The flexible display panel comprises a main structure area, a binding area and a bending area between the main structure area and the binding area, wherein the main structure area comprises a display area and a packaging 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 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 also includes a cutting boundary, which is located on at least one side of the packaging area away from the display area, and 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.

2. The flexible display panel according to claim 1, characterized in that: The flexible display panel further includes: an inorganic material layer, the inorganic material layer being arranged on a side of the substrate away from the back film; An organic material layer is disposed on a side of the inorganic material layer 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, characterized in that: 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, characterized in that: The first metal layer is symmetrical in orthographic projection on the back film.

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

6. The flexible display panel according to claim 1, characterized in that: The flexible display panel further includes: A gate insulating layer disposed on a side of the substrate away from the back film, and a gate layer disposed on a side of the gate insulating layer away from the back film, the gate layer comprising a first gate located in the main structure area and a second gate located in the binding area, the first metal layer being electrically connected to the first gate via a first through hole disposed on the gate insulating layer; A second metal layer, wherein the second metal layer is arranged on a 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.

7. The flexible display panel according to claim 6, characterized in that: The flexible display panel further includes a first blocking dam, which is disposed on a side of the gate layer away from the substrate, and an orthographic projection of the first blocking 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.

8. The flexible display panel according to claim 6, characterized in that: The substrate further comprises: a first substrate, the first substrate being disposed on a side of the first metal layer away from the gate insulating layer; and / or A second substrate, 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 arranged 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.

9. The flexible display panel according to claim 2, characterized in that: The portion of the organic material layer located in the main structure area includes multiple layers of organic material sub-layers, and the portion of the organic material layer located in the bending area and at least one layer of the organic material sub-layer 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.

10. The flexible display panel according to any one of claims 1 to 9, characterized in that: 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, and the first direction is the arrangement direction of the main structure area, the bending area, and the binding area.

11. The flexible display panel according to any one of claims 1 to 9, characterized in that: The first metal layer includes at least one of the following: molybdenum, aluminum alloy, and Ti / Al / Ti stacked metal.

12. The flexible display panel according to any one of claims 1 to 9, characterized in that: 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 arranged on a side of the substrate 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.

13. A display device, characterized in that: The display device comprises a flexible circuit board and a flexible display panel as claimed in any one of claims 1 to 12, 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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