Flexible display panel and electronic device

Abstract

This application relates to the field of display technology and discloses a flexible display panel and an electronic device. The flexible display panel includes a bending region, which comprises a flexible support layer, a wiring layer, and a cover layer. The wiring layer and the flexible support layer are stacked along the thickness direction of the bending region. Along the thickness direction of the bending region, the cover layer is stacked on the side of the wiring layer facing away from the flexible support layer. One or more grooves are formed on the flexible support layer, with the openings of the grooves facing the side of the flexible support layer facing away from the wiring layer. Furthermore, along the thickness direction of the bending region, the distance between the wiring layer and the neutral layer of the bending region is less than a first value. Thus, in this embodiment, by creating grooves in the flexible support layer, the wiring layer can be adjusted to be near the neutral layer, thereby preventing cracking of the metal wiring in the bending region, improving reliability, and reducing the bending radius of the bending region, thereby effectively reducing the bezel width of the electronic device.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a flexible display panel and electronic device. Background Technology

[0002] With the development of display technology, flexible organic light emitting diode (OLED) display technology has been widely used in flexible display panels (also known as display modules) of various electronic devices to meet users' needs for high image quality, thinness, and high screen refresh rate of electronic devices.

[0003] Developers typically leverage the bendable nature of flexible display panels, employing chip-on-plastic (COP) packaging technology to reduce bezels in electronic devices and achieve high screen-to-body ratios. Current flexible display panels include metal traces. To prevent excessive stress on these traces during bending, developers often set a relatively large bending radius. This can result in thicker flexible display panels and insufficiently narrow bezels in electronic devices. Summary of the Invention

[0004] To address the aforementioned technical problems, embodiments of this application provide a flexible display panel and an electronic device. The present application is described below from multiple perspectives, and the implementation methods and beneficial effects described below can be referenced interchangeably.

[0005] In a first aspect, embodiments of this application provide a flexible display panel, which includes a bending region. The bending region includes a flexible support layer, a wiring layer, and a cover layer. The wiring layer and the flexible support layer are stacked together along the thickness direction of the bending region. Along the thickness direction of the bending region, the cover layer is stacked on the side of the wiring layer facing away from the flexible support layer. The flexible support layer has one or more grooves, the openings of which face the side of the flexible support layer facing away from the wiring layer. Furthermore, along the thickness direction of the bending region, the distance between the wiring layer and the neutral layer of the bending region is less than a first value.

[0006] In this embodiment, by slotting the flexible support layer in the bending area of ​​the flexible display panel, the equivalent thickness of the flexible support layer can be reduced, allowing the neutral layer to be adjusted to the vicinity of the wiring layer, thereby reducing the internal stress of the wiring layer. This prevents cracking of the metal wiring in the bending area, improves reliability, and increases the bending degree of the flexible display panel, i.e., reduces the bending radius of the bending area of ​​the flexible display panel, thus effectively reducing the bezel width of the electronic device.

[0007] In any possible implementation of the first aspect, the aforementioned first value is 5 micrometers to 8 micrometers.

[0008] In some embodiments, since the metal traces in the trace layer may have a certain height difference or unevenness, the distance between different positions of the trace layer and the neutral layer of the flexible display panel may be different. Therefore, the above distance is the average distance between different positions of the trace layer and the neutral layer.

[0009] In any possible implementation of the first aspect, the groove is filled with a first colloid that is connected to the bottom wall of the groove.

[0010] It is understandable that the first colloid can support the area inside the groove, helping to adjust the wiring layer to near the neutral layer and reducing the risk of metal wiring cracking. For example, if slotting the flexible support layer in the bending area results in an insufficiently thin equivalent layer, causing the neutral layer to be below the wiring layer, the first colloid can be added to the groove to increase the equivalent thickness of the flexible support layer, thus placing the neutral layer near the wiring layer. This reduces the bending radius of the flexible display panel's bending area, effectively reducing the bezel of the electronic device and improving the reliability of the bending area.

[0011] In any possible implementation of the first aspect, the filling depth of the first colloid in the groove is 0.1 to 1 times the depth of the groove.

[0012] In any possible implementation of the first aspect, the first colloid is an MCL adhesive.

[0013] In any possible implementation of the first aspect, the side of the wiring layer facing away from the flexible support layer does not include MCL adhesive.

[0014] It is understandable that in existing flexible display panels, the MCL adhesive on the side of the wiring layer facing away from the flexible support layer is used to protect the bending area and reduce the stress on the wiring layer. However, this leads to an increase in the thickness of the bending area, thereby increasing the bezel width of the electronic device and hindering the achievement of a high screen-to-body ratio. In this embodiment, by creating grooves in the flexible support layer and adding an etch barrier layer between the flexible support layer and the wiring layer, the neutral layer can be adjusted to be near the wiring layer. Therefore, the MCL adhesive at the bending area of ​​the flexible display panel can be eliminated, thereby reducing the bezel width of the electronic device and facilitating the achievement of a high screen-to-body ratio.

[0015] In any possible implementation of the first aspect, the flexible display panel further includes a second colloid located on the side of the wiring layer opposite to the flexible support layer; the second colloid is an MCL adhesive, and the thickness of the second colloid is less than the thickness of the first colloid.

[0016] It is understood that the thickness of the second adhesive in this application can be less than the thickness of the MCL adhesive in existing flexible display panels. That is, in the embodiments of this application, the MCL adhesive at the bending area of ​​the flexible display panel may not be removed, but the thickness of the MCL adhesive may be reduced to reduce the bezel width of the electronic device.

[0017] In any possible implementation of the first aspect, the aforementioned flexible display panel further includes an etch barrier layer stacked between the flexible support layer and the wiring layer.

[0018] It is understandable that when bending a flexible display panel, the relatively large thickness of the flexible support layer causes the wiring layer in the bending area to be located on the side of the neutral layer facing away from the flexible support layer. This results in higher stress in the wiring layer and an increased likelihood of metal trace breakage. By adding an etch barrier layer between the wiring layer and the flexible support layer, based on slotting in the flexible support layer, the neutral layer can be adjusted to be closer to the wiring layer. This helps reduce stress concentration in the bending area, lowers the stress in the wiring layer, prevents metal trace breakage, and improves reliability.

[0019] In any possible implementation of the first aspect, the aforementioned overlay layer includes an isolation protection layer that is attached to the wiring layer.

[0020] It is understandable that there may be some height difference or unevenness in the metal traces in the trace layer. The isolation and protection layer can ensure the uniformity and quality of the trace layer, prevent the metal traces from being damaged by external factors, and effectively isolate electrical interference between different layers.

[0021] In any possible implementation of the first aspect, the cross-sectional shape of the groove is any one of a rectangle, a rounded rectangle, a racetrack shape, a circle, a polygon, or an irregular shape.

[0022] It should be noted that, in the embodiments of this application, the number, depth and position of one or more grooves on the flexible support layer can be set according to the bending radius and thickness of the flexible display panel to be achieved in the actual application. Furthermore, different grooving schemes also need to be determined in combination with the process design and material selection in the actual application. This application does not make specific limitations in this regard.

[0023] In any possible implementation of the first aspect, the ratio of the sum of the areas of the cross sections of the one or more grooves to the area of ​​the bending region is 1 to 0.1.

[0024] In any possible implementation of the first aspect, along the length direction of the flexible display panel, the flexible display panel includes a first non-bending area, a bending area, and a second non-bending area connected in sequence, the bending area having an arc-shaped structure such that the first non-bending area and the second non-bending area are arranged opposite to each other along a first direction, the first direction being parallel to the thickness direction of the first non-bending area; wherein the arc-shaped structure encloses a first space, the first space being filled with a third colloid.

[0025] It is understandable that the third colloid can support the bending area of ​​the flexible display panel, thereby improving the impact resistance of the flexible display panel.

[0026] In any possible implementation of the first aspect, the third colloid is an epoxy resin.

[0027] In any possible implementation of the first aspect, the flexible display panel further includes a first protective adhesive layer and a second protective adhesive layer, the first protective adhesive layer being adhered to the surface of the first non-bending area facing the second non-bending area, the second protective adhesive layer being adhered to the surface of the second non-bending area facing the first non-bending area, and the first and second protective adhesive layers being bonded together.

[0028] It is understood that since the bending radius of the bending area of ​​the flexible display panel provided in this application embodiment can be very small, in some embodiments the first protective adhesive layer and the second protective adhesive layer can be directly bonded after the flexible display panel is bent. Therefore, the flexible display panel can remove the padding blocks and adhesive layers in the existing flexible display panel, thereby reducing the thickness of the flexible display panel.

[0029] In any possible implementation of the first aspect, the bending radius of the aforementioned bending zone is less than or equal to 0.1 mm.

[0030] It is understood that the bending radius of the bending area of ​​existing flexible display panels is relatively large, for example, it can be 0.25 mm. The bending radius of the flexible display panel provided in this application embodiment can be less than or equal to 0.1 mm, for example, it can be 0.08 mm.

[0031] Secondly, embodiments of this application provide an electronic device, which includes a housing and a flexible display panel as described in the first aspect and any possible implementation thereof, wherein the flexible display panel is disposed on the housing. Attached Figure Description

[0032] Figure 1A According to some embodiments of this application, a schematic diagram of a plate in a state where no bending has occurred is shown;

[0033] Figure 1B According to some embodiments of this application, a schematic diagram of the state of a plate after bending and the position of the neutral layer is shown;

[0034] Figure 2A According to some embodiments of this application, a schematic diagram of the structure of an electronic device is shown;

[0035] Figure 2B According to some embodiments of this application, a schematic diagram of the structure of a flexible display panel is shown;

[0036] Figure 2C According to some embodiments of this application, a structural schematic diagram of the bending area of ​​a flexible display panel is shown;

[0037] Figure 3 According to some embodiments of this application, a schematic diagram of another flexible display panel structure is shown;

[0038] Figure 4 According to some embodiments of this application, a structural schematic diagram of the bending area of ​​another flexible display panel is shown;

[0039] Figure 5A According to some embodiments of this application, a structural schematic diagram of the bending area of ​​another flexible display panel is shown;

[0040] Figure 5B According to some embodiments of this application, a schematic diagram of the shape of a groove is shown;

[0041] Figure 6 According to some embodiments of this application, a schematic diagram of simulation results is shown showing the stress variation of the wiring layer when the stack of layers in the bending area is different;

[0042] Figure 7 According to some embodiments of this application, a structural schematic diagram of yet another flexible display panel is shown;

[0043] Figure 8 According to some embodiments of this application, a schematic diagram of applying a flexible display panel in a smartwatch is shown. Detailed Implementation

[0044] The illustrative embodiments of this application include, but are not limited to, a flexible display panel and an electronic device. The flexible display panel of this application is described below with reference to specific embodiments.

[0045] To more clearly illustrate the solutions of the embodiments of this application, the relevant field terms involved in this application will be explained below.

[0046] (1) Neutral layer of the board

[0047] Sheet 300 is a layer whose length remains constant during pure bending. (The following is combined with...) Figure 1A and Figure 1B An example is provided. Figure 1A This shows the state of plate 300 when it is not bent. (Reference) Figure 1A When plate 300 is not bent, its length is L. Figure 1B The image shows the state of plate 300 after bending. (Reference) Figure 1B When plate 300 bends under the action of external force F, the lower half 302 of plate 300 is compressed (i.e., the internal stress of the lower half of plate 300 is compressive stress), and the length of the lower half 302 shortens from L to L1. The upper half 301 of plate 300 is stretched (i.e., the internal stress of the upper half of plate 300 is tensile stress), and the length of the upper half 301 increases from L to L2.

[0048] Between the upper portion 301 and the lower portion 302 lies a layer of constant length, which is the neutral layer P0 of plate 300. The neutral layer P0 is subjected to neither tensile nor compressive stress, and its internal stress is almost zero. Furthermore, the length of the neutral layer P0 remains almost unchanged, remaining at L.

[0049] When determining the neutral layer in a flexible display panel, the length of each layer of the flexible display panel can be measured under a pure bending state. If the length of a certain layer does not change significantly compared to its length before bending (e.g., the change is less than 5%), then that layer is the neutral layer.

[0050] The following is a combination of... Figures 2A to 2C This paper introduces an electronic device and the structure of a flexible display panel in the electronic device.

[0051] Figure 2A This application illustrates an exemplary application scenario of an embodiment of the present application, specifically an electronic device 100. The electronic device 100 can be a mobile phone, tablet computer, laptop computer, ultra-mobile personal computer (UMPC), handheld computer, touch-screen TV, large-screen device, speaker, netbook, personal digital assistant (PDA), wearable device, virtual reality device, intelligent robot, industrial equipment, etc., and this application does not limit the scope of the application.

[0052] To facilitate the subsequent description, before introducing the specific structure of the electronic device 100, we will first combine... Figure 2A Define the X-axis, Y-axis, and Z-axis directions corresponding to electronic device 100. For example... Figure 2AAs shown, the X-axis represents the length of the electronic device 100, and the Y-axis represents the width of the electronic device 100. For example, the positive X-axis can be the direction from the bottom edge k1 of the electronic device 100 to the top edge k2, and correspondingly, the positive Y-axis can be the direction from the right edge k3 of the electronic device 100 to the left edge k4. The Z-axis represents the thickness of the electronic device 100; for example, the positive Z-axis can be the direction from the front of the electronic device 100 to the back. Exemplarily, the X-axis, Y-axis, and Z-axis are mutually perpendicular.

[0053] It is understood that the perpendicularity in this application is not absolute perpendicularity. Approximate perpendicularity due to processing and assembly errors (e.g., an angle of 89.9° between two structural features) is also within the scope of perpendicularity in this application. Similarly, the parallelism in this application is not absolute parallelism. Approximate parallelism due to processing and assembly errors (e.g., an angle of 0.1° between two structural features) is also within the scope of parallelism in this application. This application does not impose specific limitations on these aspects, and the limitations on perpendicularity and parallelism will not be repeated below.

[0054] Additionally, it should be noted that the directional terms such as "top," "bottom," "left," and "right" used in this application refer to the orientation of the electronic device 100 in its normal operating state (for example, the top border k2 is the uppermost border of the electronic device in its normal operating state), rather than indicating or implying that the structure referred to must have a specific orientation. These terms can change accordingly based on actual use and should not be construed as limitations on this application.

[0055] like Figure 2A As shown, the electronic device 100 includes a flexible display panel 10 and a housing 11, with the flexible display panel 10 disposed on the housing 11. For example, the flexible display panel 10 and the housing 11 are fixedly connected by an adhesive. The flexible display panel 10 is used to realize the display function of the electronic device, such as displaying text, images, videos, and other information.

[0056] Reference Figure 2B , Figure 2B yes Figure 2A A schematic diagram of the cross-sectional structure of the electronic device 100 shown in the AA direction.

[0057] like Figure 2BAs shown, the flexible display panel 10 includes a display area PV, a first non-bending area PD, a bending area PB, and a second non-bending area PT (also known as a terminal area) connected in sequence. By bending the bending area PB of the flexible display panel 10, the bezel width L11 of the electronic device 100 can be reduced, thereby increasing the screen-to-body ratio of the electronic device 100. Specifically, the flexible display panel 10 can be bent using COP technology. COP technology refers to bending a portion of the flexible display panel 10 towards the back for encapsulation, and integrating the screen cable and integrated circuit (IC) chip onto the back of the flexible display panel 10. This technology can significantly reduce the bezel width of the electronic device 100.

[0058] When the flexible display panel 10 is mounted on the electronic device 100, the thickness directions of the display area PV, the first non-bending area PD, and the second non-bending area PT can all be parallel to the thickness direction of the electronic device (i.e., the Z-direction). The thickness direction of the bending area PB changes depending on the bending position. For example, refer to... Figure 2B At position A1 of the bending zone PB, the thickness direction of the bending zone PB is Z1, and at position A2 of the bending zone PB, the thickness direction of the bending zone PB is Z2.

[0059] Figure 2C This is a schematic diagram of the flexible display panel 10 when the bending area PB is in a flattened state. (Reference) Figure 2C When the bending area PB is in a flattened state, the thickness direction of each part of the bending area PB can be the same, for example, all parallel to the thickness direction of the display area PV (i.e., the Z direction).

[0060] refer to Figure 2C In some embodiments, the end of the bending region PB closest to the first non-bending region PD is the bending start point M, and the end of the bending region PB closest to the second non-bending region PT is the bending end point N. (Refer to...) Figure 2B and Figure 2C The inner side of the bending region PB may include multiple layers stacked along the thickness direction of the bending region PB, and each layer may extend to the first non-bending region PD and the second non-bending region PT, thereby forming a stacked structure 104. In some embodiments, the stacked structure 104 may be represented as a substrate (PANEL) 104.

[0061] In some embodiments, such as Figure 2BAs shown, the bending area PB of the flexible display panel 10 has an arc-shaped structure, such that the first non-bending area PD and the second non-bending area PT are arranged opposite each other along a first direction, which is parallel to the thickness direction of the first non-bending area PD (i.e., the thickness direction of the flexible display panel 10). Furthermore, the flexible display panel 10 includes a support structure 105, which includes a first protective adhesive layer 105a, a second protective adhesive layer 105b, a shim 105c, and an adhesive layer 105d. The first protective adhesive layer 105a is adhered to the surface of the first non-bending area PD facing the second non-bending area PT, and the second protective adhesive layer 105b is adhered to the surface of the second non-bending area PT facing the first non-bending area PD. For example, the first protective adhesive layer 105a and the second protective adhesive layer 105b can be a barrier protection film (BPF) to prevent water and oxygen intrusion, protect the circuitry in the flexible display panel 10 from corrosion, enhance mechanical strength, and reduce damage to electronic components from external forces.

[0062] The following is combined Figure 2B and Figure 2C The structure of the bending zone PB is described below. For details on the stacked structure 104, please refer to the relevant description of the bending zone PB.

[0063] like Figure 2C As shown, along the thickness direction of the bending region PB, the bending region PB includes a flexible support layer 201 (also referred to as a flexible substrate), a wiring layer 202, and a cover layer 203. Among them, the wiring layer 202 and the flexible support layer 201 are stacked, and the cover layer 203 is stacked on the side of the wiring layer 202 facing away from the flexible support layer 201.

[0064] For example, the flexible support layer 201 can be made of polyimide (PI), which has the characteristics of high flexibility and high temperature resistance. The flexible support layer 201 can give the flexible display panel 20 the characteristics of being able to be bent, folded or rolled.

[0065] For example, the wiring layer 202 may be composed of metal traces and is mainly used to transmit electrical signals, including data signals and power signals.

[0066] For example, the cover layer 203 can prevent the metal traces in the trace layer 202 from being damaged by external factors and can provide a smooth surface for the bending area PB.

[0067] Continue to refer to Figure 2B In the bending area PB of the flexible display panel 10, the side of the wiring layer 202 facing away from the flexible support layer 201 also includes MCL adhesive 107, the thickness of which is L12. The MCL adhesive 107 is used to protect the bending area PB of the flexible display panel 10 and can also reduce the stress of the wiring layer 202 in the flexible display panel 10.

[0068] Combination Figure 2C As shown, a polarizer (POL) 103 may be stacked on top of the stacked structure 104 of the first non-bending area PD of the flexible display panel 10. The polarizer 103 is used to control the polarization direction of light, reduce ambient light reflection, improve screen contrast, and improve the outdoor visibility of the flexible display panel.

[0069] In some embodiments, an optically transparent adhesive layer 102 is stacked on top of the polarizer 103. The optically transparent adhesive is a high-transmittance adhesive material, and the optically transparent adhesive layer 102 is used to bond different optical layers, which can reduce interface reflection and ensure display clarity.

[0070] In some embodiments, a glass cover plate 101 is also stacked on top of the optically transparent adhesive layer 102. The glass cover plate 101 is used to protect the internal structure of the flexible display panel from scratches or impacts.

[0071] In some embodiments, the glass cover 101 further includes a light-shielding region 106, which can be formed by coating graphite on the back side of the glass cover 101. The light-shielding region 106 can shield structures on the back side of the glass cover 101, such as the first non-bending region PD and the bending region PB. The light-shielding region 106 can extend from the edge of the glass cover 101 in the negative X-axis direction, along the positive X-axis direction, and into the optically transparent adhesive layer 102.

[0072] In some embodiments, the light-shielding area 106 corresponds to the frame of the electronic device 100. To protect the bending area PB of the flexible display panel 10, the glass cover 101 typically needs to extend beyond the bending area PB.

[0073] For example, in the X-axis direction, the distance between the left edge of the glass cover 101 and the bending area PB is S, and the size of S can be between 1.1 mm and 1.7 mm. Figure 2C As shown, the flexible support layer 201 is relatively thick, and the neutral layer of the bending region PB is relatively close to or located within the flexible support layer 201. The trace layer 202 in the bending region PB is located at the upper part of the bending region PB and is far from the neutral layer. This will cause the trace layer 202 to be subjected to stress, which may make the metal traces in the trace layer 202 prone to breakage.

[0074] To prevent excessive stress in the bending area PB during bending of the flexible display panel 10, which could lead to breakage of the metal traces in the wiring layer 202, reduced reliability, and decreased yield, in some embodiments, the bending radius r of the bending area PB is set to be relatively large. The bending radius is the radius of the inner surface of the bending area PB; for example, the bending radius r can be set to 0.25 mm.

[0075] It is understandable that the bezel width L11 of the electronic device 100 is the sum of the distance S, the thickness of the bending area PB, and the bending radius r. Since the bending radius r is set relatively large, the bezel width L11 of the electronic device 100 may be relatively large. Furthermore, the MCL adhesive 107 at the bending area PB increases the thickness of the bending area PB by L12, which in turn leads to a corresponding increase in the bezel width L11 of the electronic device 100 by L12, which is detrimental to achieving a high screen-to-body ratio.

[0076] To address the aforementioned problems, this application provides a flexible display panel 20. (Refer to...) Figure 3 As shown, the flexible display panel 20 includes a bending region PB. Combined with... Figure 4 As shown in (1) of the diagram, the structure of the bent region PB in its flattened state reveals that the bent region PB includes a flexible support layer 201, a wiring layer 202, and a cover layer 203. The wiring layer 202 and the flexible support layer 201 are stacked together along the thickness direction of the bent region PB, and the cover layer 203 is stacked on the side of the wiring layer 202 facing away from the flexible support layer 201 along the thickness direction of the bent region PB. The flexible support layer 201 has one or more grooves 108, the openings of which face the side of the flexible support layer 201 facing away from the wiring layer 202.

[0077] It is understood that in this application, by slotting the flexible support layer 201 in the bending region PB, the equivalent thickness of the flexible support layer 201 can be reduced, causing the neutral layer P1 to move upward, thereby reducing the distance between the wiring layer 202 and the neutral layer P1, and thus reducing the internal stress of the wiring layer 202. It is understood that the closer the distance between the wiring layer 202 and the neutral layer P1, the smaller the internal stress in the wiring layer 202 can be.

[0078] In other words, in this embodiment, by slotting the flexible support layer 201, the wiring layer 202 can be adjusted to be near the neutral layer P1, thereby reducing or even eliminating the stress on the metal wiring in the wiring layer 202. This prevents cracking of the metal wiring in the bending area PB, improves reliability, and increases the bending degree of the flexible display panel 20, i.e., reduces the bending radius r of the bending area PB of the flexible display panel 20, thus effectively reducing the bezel width of the electronic device.

[0079] In this embodiment, along the thickness direction of the bending region PB, the distance between the wiring layer 202 and the neutral layer P1 of the bending region PB is less than a first value. The first value can be 5 μm.

[0080] In some embodiments, the trace layer may overlap or partially overlap with the neutral layer P1 to further reduce the internal stress of the trace layer.

[0081] The flexible display panel 20 provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0082] The flexible display panel 20 provided in the embodiments of this application is used instead of, for example Figure 2A The flexible display panel 10 in the electronic device 100 shown provides the electronic device 100 provided in this application embodiment.

[0083] Understandable. Figure 3 This diagram primarily shows a cross-sectional view of the electronic device 100, including the flexible display panel 20, along the AA direction. The shape of the display area of ​​the flexible display panel 20 can differ depending on the electronic device it is applied to. For example, when applied to a mobile phone, the shape of the display area of ​​the flexible display panel 20 can be square; similarly, when applied to a smartwatch, the shape of the display area of ​​the flexible display panel 20 can be circular. However, the structures in the thickness direction (i.e., the Z-axis direction) are similar and can be referenced accordingly. Figure 3 The diagram shown is a structural schematic.

[0084] Reference Figure 3 The flexible display panel 20 includes a bending region PB. For ease of understanding, Figure 4 An exemplary structure of the bending region PB in a flattened state is shown.

[0085] Combination Figure 4 As shown in (1), the bending region PB of the flexible display panel 20 includes a flexible support layer 201, a wiring layer 202, and a cover layer 203. The wiring layer 202 and the flexible support layer 201 are stacked together along the thickness direction of the bending region PB, and the cover layer 203 is stacked on the side of the wiring layer 202 facing away from the flexible support layer 201 along the thickness direction of the bending region PB. One or more grooves 108 are formed on the flexible support layer 201, with the openings of the grooves 108 facing the side of the flexible support layer 201 facing away from the wiring layer 202. Figure 3 In the flexible display panel 20 shown, the distance between the wiring layer 202 and the neutral layer P1 of the flexible display panel 20 along the thickness direction of the flexible display panel 20 is less than a first value. In some embodiments, the first value is 5 micrometers to 8 micrometers.

[0086] Since the metal traces in the trace layer 202 may have a certain height difference or unevenness, the distance between different positions of the trace layer 202 and the neutral layer P1 of the flexible display panel 20 may be different. Therefore, the above distance is the average distance between different positions of the trace layer 202 and the neutral layer P1.

[0087] For example, such as Figure 3 As shown, the flexible support layer 201 may have three grooves, including a first groove 108a, a second groove 108b and a third groove 108c.

[0088] It is understandable that by slotting the flexible support layer 201, the effective thickness of the flexible support layer 201 in the bending region PB can be reduced. When the flexible display panel 20 is bent, the wiring layer 202 can be adjusted to the vicinity of the neutral layer P1, which can prevent the metal wiring in the wiring layer 202 from cracking and improve reliability. Furthermore, by slotting the flexible support layer 201, the degree of bending of the flexible display panel 20 can be increased, and the bending radius of the bending region PB can be reduced. Figure 3 As shown, the frame width L21 of the electronic device is the sum of the distance S, the thickness of the bending area PB, and the bending radius r1. Reducing the bending radius can reduce the frame width L21 of the electronic device.

[0089] In some embodiments, the flexible support layer 201 may include multiple flexible substrates, and a barrier layer is typically stacked between any two flexible substrates in the multiple flexible substrates. The barrier layer is used to protect each flexible substrate layer and prevent moisture and oxygen from penetrating into the electronic components in the flexible display panel 20.

[0090] For example, taking the flexible support layer 201 as an example, which includes two flexible substrates, the flexible support layer 201 may include a first flexible substrate 201a and a second flexible substrate 201b, and a barrier layer 201c is also stacked between the first flexible substrate 201a and the second flexible substrate 201b.

[0091] In some embodiments, the depth of one or more grooves 108 may be less than or equal to the thickness of the flexible support layer 201 (i.e., the sum of the thicknesses of the multilayer flexible substrate and the barrier layer).

[0092] In some embodiments, one or more of the grooves 108 are filled with a first colloid 109, which is connected to the bottom wall of the groove 108.

[0093] Taking the flexible support layer 201 with three grooves as an example, such as Figure 4 As shown in (1), the flexible support layer 201 includes a first groove 108a, a second groove 108b and a third groove 108c. The first groove 108a is filled with a first colloid 109a and the first colloid 109a is connected to the bottom wall of the first groove 108a. The second groove 108b is filled with a first colloid 109b and the first colloid 109b is connected to the bottom wall of the second groove 108b. The third groove is filled with a first colloid 109c and the first colloid 109c is connected to the bottom wall of the third groove 108c.

[0094] It is understandable that the first colloid 109 can support the area inside the groove 108, which helps to adjust the wiring layer 202 to near the neutral layer P1 and reduce the risk of metal wiring cracking.

[0095] The depth of the first colloid 109 can be determined based on the position of the neutral layer P1. For example, if the equivalent thickness of the flexible support layer 201 is too thin after slotting in the flexible support layer 201 of the bending area PB, causing the neutral layer P1 to be located below the wiring layer 202, the equivalent thickness of the flexible support layer 201 can be increased by adding the first colloid 109 in the groove, so that the neutral layer P1 is located near the wiring layer 202. In this way, the bending radius of the bending area PB of the flexible display panel 20 can be reduced, thereby effectively reducing the bezel size and improving the reliability of the bending area PB.

[0096] In some embodiments, the filling depth of the first colloid 109 in the groove 108 is 0.1 to 1 times the depth of the groove.

[0097] In some embodiments, the first adhesive is an MCL (micro coating layer) adhesive. MCL adhesive has excellent bonding strength and good flexibility, and can maintain structural integrity under extreme bending and twisting conditions, exhibiting high stability and reliability.

[0098] Continue to refer to Figure 4 In some embodiments, the flexible display panel 20 further includes an etching barrier layer 204, which may be disposed in the bending region PB and stacked between the flexible support layer 201 and the wiring layer 202.

[0099] It is understood that during the fabrication of the flexible display panel 20, the etching barrier layer 204 can be used to control the depth of one or more of the aforementioned grooves 108. Furthermore, when bending the flexible display panel 20, the etching barrier layer 204 can also be used to reduce the stress concentration in the bending area PB and adjust the wiring layer 202 to the vicinity of the neutral layer P1 to avoid cracking of the metal wiring in the wiring layer 202 and improve reliability.

[0100] For example, after slotting on the flexible support layer 201, if the neutral layer P1 is still located below the trace layer 202, an etching barrier layer 204 can be added between the trace layer 202 and the flexible support layer 201 to increase the thickness of the layer below the trace layer 202 and adjust the neutral layer P1 to be near the trace layer 202, thereby preventing the metal traces in the trace layer 202 from breaking.

[0101] In some embodiments, the material of the metal traces in the trace layer 202 may be titanium (Ti) or aluminum (Al), etc.

[0102] In some embodiments, the thickness of the etch stop layer 204 may be less than or equal to the thickness of the wiring layer 202. For example, the thickness of the wiring layer 202 may be 0.8 micrometers, and the thickness of the etch stop layer 204 may be 0.5 micrometers.

[0103] In some embodiments, the material of the etching barrier layer 204 can be a metal or an inorganic oxide, such as molybdenum (Mo), silicon oxide (SiOx), or indium zinc oxide (IZO).

[0104] In some embodiments, the cover layer 203 in the flexible display panel 20 further includes a first planarization layer (PLN) 203a, which may be disposed above the wiring layer 202.

[0105] In some embodiments, a second planarization layer 203b (i.e., between the wiring layer 202 and the flexible support layer 201) is also included below the wiring layer 202.

[0106] It is understandable that there may be a certain height difference or unevenness in the metal traces in the trace layer 202. Setting planarization layers above and below the trace layer 202 can ensure the uniformity and quality of the trace layer, prevent the metal traces from being damaged by external factors, and effectively isolate electrical interference between different layers.

[0107] In some embodiments, the overlay layer 203 further includes a pixel define layer (PDL) 203c and an overcoat layer (OC) 203d. The pixel define layer 203c is stacked on top of the second planarization layer 203b and is used to define the pixel structure, avoid light emission crosstalk between adjacent pixels, ensure display resolution and color purity, and improve the display performance of the flexible display panel 20. The overcoat layer 203d is stacked on top of the pixel define layer 203c and is used to provide a smooth surface, avoiding problems such as uneven image display caused by unevenness of the pixel define layer 203c surface.

[0108] In some embodiments, the cover layer 203 is made of organic material.

[0109] In some embodiments, in the flexible display panel 20, the side of the wiring layer 202 facing away from the flexible support layer 201 does not include MCL adhesive.

[0110] In this embodiment, by slotting the flexible support layer 201 and adding an etching barrier layer 204 between the flexible support layer 201 and the wiring layer 202, the neutral layer P1 is adjusted to be near the wiring layer 202, thereby reducing the stress on the wiring layer 202. Therefore, the MCL adhesive 107 at the bending area PB of the flexible display panel 10 can be eliminated, thereby reducing the bezel width of the electronic device and facilitating the achievement of a high screen-to-body ratio.

[0111] In some embodiments, the flexible display panel 20 may include a second adhesive located on the side of the wiring layer 202 facing away from the flexible support layer 201 (i.e., the outer surface of the bending region PB). The second adhesive is an MCL adhesive, and its thickness is less than that of the first adhesive. The second adhesive can be used to protect the bending region PB of the flexible display panel 20.

[0112] For example, the thickness of the second colloid can be between 0 and 70 micrometers, the thickness of the first colloid can be between 0 and 100 micrometers, and the ratio of the thickness of the second colloid to the thickness of the first colloid can be between 0.7 and 1.

[0113] It is understandable that the position of the second colloid in the flexible display panel 20 can be related to... Figure 2B The MCL adhesive 107 shown is in the same position in the flexible display panel 10. The thickness of the second adhesive in this application can be less than the thickness of the MCL adhesive 107 in the flexible display panel 10.

[0114] The following is combined Figure 4 , Figure 5A and Figure 5B The depth and shape of one or more of the above-mentioned grooves 108 will be described. For ease of understanding, an example is taken where the back of the bending area PB of the flexible support layer 201 is provided with three grooves (including the first groove 108a, the second groove 108b, and the third groove 108c).

[0115] In some embodiments, Figure 4 The bottom view of the bending area PB of the flexible display panel 20 in (1) is shown below. Figure 4 As shown in (2), in the Y-axis direction, the first groove 108a, the second groove 108b and the third groove 108c can penetrate the flexible support layer 201.

[0116] In some embodiments, the depths of the first groove 108a, the second groove 108b, and the third groove 108c (i.e., their lengths in the Z-axis direction) can be equal to the thickness of the flexible support layer 201, such as... Figure 4 As shown in (1) of the table.

[0117] In some embodiments, the depths of the first groove 108a, the second groove 108b, and the third groove 108c can be equal to the thickness of the first flexible substrate 201a, such as... Figure 5A As shown. Furthermore, the depths of the first groove 108a, the second groove 108b, and the third groove 108c can be equal.

[0118] For example, assuming the flexible support layer 201 includes a first flexible substrate 201a, a second flexible substrate 201b, and a barrier layer 201c, the thickness of the first flexible substrate 201a is 10 micrometers, the thickness of the second flexible substrate 201b is 6 micrometers, and the thickness of the barrier layer 201c is 0.35 micrometers, that is, the thickness of the flexible support layer 201 is 16.35 micrometers, then the depth of the first groove 108a, the depth of the second groove 108b, and the depth of the third groove 108c can be less than or equal to 16.35 micrometers.

[0119] It should be noted that, in the embodiments of this application, the number, depth and position of one or more grooves 108 on the flexible support layer 201 can be set according to the bending radius and thickness of the flexible display panel to be achieved in the actual application, and this application does not make specific limitations in this regard.

[0120] In some embodiments, the shape of the longitudinal section of one or more grooves 108 (the longitudinal section is parallel to the XZ plane) may include, but is not limited to, rectangle, trapezoid, arch, etc.

[0121] In some embodiments, the shape of the cross-section of one or more grooves 108 (the cross-section is parallel to the XY plane) can be any one of rectangle, rounded rectangle, racetrack shape, circle, polygon or irregular shape.

[0122] For example, in combination Figure 4 The bottom view of the bending area PB of the flexible display panel 20 shown in (1) shows that the shape of the cross-section of the one or more recesses 108 may include Figure 4 The rectangle shown in (2) is Figure 5B The rounded rectangle shown in (1) is Figure 5B The runway shape shown in (2) is as follows.

[0123] In some embodiments, at least one groove 108 may be formed on the flexible support layer 201 at the bending region PB of the flexible display panel 20 in the Y-axis direction. For example, as Figure 5B As shown in (3), (4), and (5), two grooves 108 are formed on the flexible support layer 201 of the bending region PB in the Y-axis direction, and three grooves 108 are formed on the flexible support layer 201 of the bending region PB in the X-axis direction, for a total of six grooves 108. The shape of the cross-section of each groove 108 may include, for example, Figure 5B The circle shown in (3) is as follows: Figure 5B The hexagon shown in (4) or as shown in Figure 5B The irregular shape shown in (5) is shown in the figure.

[0124] It is understood that this application does not specifically limit the shape of the cross section and the shape of the longitudinal section of the one or more grooves 108 mentioned above.

[0125] In some embodiments, the ratio of the sum of the areas of the cross sections of one or more grooves 108 to the area of ​​the bending region PB is 1 to 0.1.

[0126] The following is combined Figure 6 The simulation results shown illustrate the stress variation of the wiring layer 202 when the stacking (i.e., slot depth) of the flexible support layer 201 in the bending region PB is different. It is understood that, to clarify the stress variation of the wiring layer 202, this application uses the controlled variable method for simulation. In multiple simulations, only the stacking of the bending region PB is changed, without altering the thickness, position, or other parameters of each layer in the flexible display panel 20.

[0127] In this simulation, the extreme case of a notch is considered, specifically, a notch 108 is created in the flexible support layer of the bending region PB of the flexible display panel 20, and the cross-sectional area of ​​the notch 108 is equal to the area of ​​the bending region PB. The maximum stress on the wiring layer 202 is measured when the flexible display panel 20 is in a bent state. This simulation is based on... Figure 4 The structure of the bending region PB of the flexible display panel 20 shown in (1) is as follows: along the thickness direction, an isolation protective layer 203d (denoted as OC), a pixel definition layer 203c (denoted as PDL), a second planarization layer 203b (denoted as PLN2), a wiring layer 202 (denoted as SD), a first planarization layer 203a (denoted as PLN1), an etch barrier layer 204 (denoted as Mo), a second flexible substrate 201b (denoted as PI2), a barrier layer 201c (denoted as barrier), and a first flexible substrate 201a (denoted as PI1) are stacked sequentially. Furthermore, the stress of the wiring layer 202 before adding the etch barrier layer 204 in the bending region PB of the flexible display panel 20 was simulated.

[0128] like Figure 6 As shown, Figure 6The simulation results include five types of stacked layers. Stack 1 is the case where the PB layer in the bending area of ​​the flexible display panel 20 has PI1, barrier, PI2, PLN1, SD, PLN2, PDL, and OC stacked. Stack 2 is the case where the PB layer in the bending area of ​​the flexible display panel 20 has PI1, barrier, PI2, PLN1, SD, PLN2, and PDL stacked. Stack 3 is the case where the PB layer in the bending area of ​​the flexible display panel 20 has barrier, PI2, Mo, PLN1, SD, PLN2, PDL, and OC stacked. Stack 4 is the case where the PB layer in the bending area of ​​the flexible display panel 20 has PI2, Mo, PLN1, SD, PLN2, PDL, and OC stacked. Stack 5 is the case where the PB layer in the bending area of ​​the flexible display panel 20 has Mo, PLN1, SD, PLN2, PDL, and OC stacked. The horizontal axis of the simulation result graph represents the distance between each position in the bending area PB of the flexible display panel 20 and the bending start point M of the bending area PB of the flexible display panel 20, with the unit of distance being millimeters. The vertical axis of the simulation result graph represents the stress at each position of the wiring layer 202 in the bending area PB of the flexible display panel 20, with the unit of megapascals (MPa).

[0129] from Figure 6 It can be seen that the maximum principal stress at each location of the routing layer 202 when the bending zone PB is layer 2 > the maximum principal stress at each location of the routing layer 202 when the bending zone PB is layer 1 > the maximum principal stress at each location of the routing layer 202 when the bending zone PB is layer 3 > the maximum principal stress at each location of the routing layer 202 when the bending zone PB is layer 4 > the maximum principal stress at each location of the routing layer 202 when the bending zone PB is layer 5. Among them, the maximum principal stress is the stress at the location of the maximum stress in the routing layer 202.

[0130] Specifically, the maximum principal stress of routing layer 202 (i.e., the stress at the location of the highest stress in the routing layer) varies depending on the stack size of the bending zone PB. As shown in Table 1, when the bending zone PB structure is stack 1, the maximum principal stress of routing layer 202 is 2272 MPa; when the bending zone PB structure is stack 2, the maximum principal stress of routing layer 202 is 2479 MPa; when the bending zone PB structure is stack 3, the maximum principal stress of routing layer 202 is 1567 MPa; when the bending zone PB structure is stack 4, the maximum principal stress of routing layer 202 is 1241 MPa; and when the bending zone PB structure is stack 5, the maximum principal stress of routing layer 202 is 131.4 MPa.

[0131] Table 1:

[0132] Stacking of PB in the bending region Maximum principal stress of trace layer 202 Stack 1: PI1, barrier, PI2, PLN1, SD, PLN2, PDL, OC 2272 Stack 2: PI1, barrier, PI2, PLN1, SD, PLN2, PDL 2479 Stack 3: barrier, PI2, Mo, PLN1, SD, PLN2, PDL, OC 1567 Stack 4: PI2, Mo, PLN1, SD, PLN2, PDL, OC 1241 Stack 5: Mo, PLN1, SD, PLN2, PDL, OC 131.4

[0133] It is understandable that stack 3 can be considered as having a groove depth equal to the thickness of the first flexible substrate 201a, stack 4 as having a groove depth equal to the sum of the thickness of the first flexible substrate 201a and the thickness of the barrier layer 201c, and stack 4 as having a groove depth equal to the sum of the thickness of the first flexible substrate 201a, the thickness of the second flexible substrate 201b and the thickness of the barrier layer 201c.

[0134] Combination Figure 6 As can be seen from Table 1 above, the stress of the wiring layer 202 gradually decreases with the increase of the groove depth. Furthermore, adding the etching barrier layer 204 can further reduce the stress of the wiring layer 202, and the maximum principal stress of the wiring layer 202 can be reduced by more than 90%.

[0135] Continue to refer to Figure 3 In some embodiments, along the length direction of the flexible display panel 20, the flexible display panel 20 includes a first non-bending area PD, a bending area PB, and a second non-bending area PT (also referred to as a terminal area) connected in sequence. The bending area PB has an arc-shaped structure, such that the first non-bending area PD and the second non-bending area PT are arranged opposite to each other along a first direction, which is parallel to the thickness direction of the first non-bending area PD. Figure 7 As shown, the arc-shaped structure forms a first space, which is filled with a third colloid 110.

[0136] In some embodiments, the third colloid 110 may be an epoxy resin.

[0137] In some embodiments, the second non-bending area PT may be bonded with an integrated circuit (IC) chip and a flexible printed circuit (FPC).

[0138] In some embodiments, such as Figure 3 As shown, the flexible display panel 20 also includes a support structure 105, which includes a first protective adhesive layer 105a and a second protective adhesive layer 105b. The first protective adhesive layer 105a is adhered to the surface of the first non-bending area PD facing the second non-bending area PT, and the second protective adhesive layer 105b is adhered to the surface of the second non-bending area PT facing the first non-bending area PD. For example, the first protective adhesive layer 105a and the second protective adhesive layer 105b may be a backsheet protective film.

[0139] In some embodiments, such as Figure 3As shown, the support structure 105 in the flexible display panel 20 also includes a padding block 105c and an adhesive layer 105d. The side of the first protective adhesive layer 105a facing away from the first non-bending area PD is bonded to the padding block 105c, and the side of the padding block 105c facing away from the first protective adhesive layer 105a is bonded to the side of the second protective adhesive layer 105b facing away from the second non-bending area PT through the adhesive layer 105d.

[0140] It is understood that, since the bending radius of the bending area PB of the flexible display panel 20 provided in this application embodiment is smaller than the bending radius of the bending area PB of the flexible display panel 10, the thickness of the shim block 105c in the flexible display panel 20 can be correspondingly smaller than the thickness of the shim block 105c in the flexible display panel 10. Therefore, the thickness of the flexible display panel 20 can also be smaller than the thickness of the flexible display panel 10, i.e., the thickness of the flexible display panel can be reduced. For example, the thickness of the flexible display panel 20 can be reduced by at least 0.32 mm.

[0141] In some embodiments, such as Figure 7 As shown, the first protective adhesive layer 105a and the second protective adhesive layer 105b in the flexible display panel 20 are bonded together.

[0142] It is understandable that since the bending radius r1 of the bending area PB of the flexible display panel 20 can be very small, in some embodiments, the first protective adhesive layer 105a and the second protective adhesive layer 105b can be directly bonded after the flexible display panel 20 is bent. Therefore, the padding block 105c and the adhesive layer 105d can be removed from the support structure 105 of the flexible display panel 20, and the thickness of the flexible display panel can be reduced.

[0143] In some embodiments, the bending radius r1 of the bending area PB of the flexible display panel 20 may be less than or equal to 0.1 mm.

[0144] Combination Figure 3 and Figure 4 As shown, in some embodiments, the flexible display panel 20 further includes a display area PV, and the display area PV, the first non-bending area PD, the bending area PB, and the second non-bending area PT are sequentially connected. (Refer to...) Figure 3 and Figure 4 The inner side of the bending region PB may include multiple layers stacked along the thickness direction of the bending region PB, each layer extending to the first non-bending region PD, the display region PV, and the second non-bending region PT, thereby forming a stacked structure 104'. In some embodiments, this stacked structure may be represented as a substrate 104'. Furthermore, the flexible support layer 201 at the first non-bending region PD, the flexible support layer 201 at the display region PV, and the flexible support layer 201 at the second non-bending region PT may not have grooves 108 provided.

[0145] In some embodiments, the structure stacked above the stacked structure 104' in the first non-bending area PD of the flexible display panel 20 and the structure stacked above the stacked structure 104' in the first non-bending area PD of the flexible display panel 10 can be the same, and the structure stacked above the stacked structure 104' in the display area PV of the flexible display panel 20 and the structure stacked above the stacked structure 104' in the display area PV of the flexible display panel 10 can be the same.

[0146] Combination Figure 3 and Figure 7 As shown, in some embodiments, a polarizer (POL) 103 is stacked on top of the stacked structure 104' in the first non-bending area PD and the stacked structure 104' in the display area PV of the flexible display panel 20.

[0147] In some embodiments, an optically transparent adhesive layer 102 is stacked on top of the polarizer 103.

[0148] In some embodiments, a glass cover plate 101 is also stacked on top of the optically transparent adhesive layer 102.

[0149] In some embodiments, the glass cover 101 further includes a light-shielding region 106, which can be formed by coating graphite on the back side of the glass cover 101. The light-shielding region 106 can shield structures on the back side of the glass cover 101, such as the first non-bending region PD and the bending region PB. The light-shielding region 106 can extend from the edge of the glass cover 101 in the negative X-axis direction, along the positive X-axis direction, and into the optically transparent adhesive layer 102.

[0150] It is understood that when the flexible display panel 20 provided in this application embodiment is applied to the electronic device 100, the light-shielding area 106 corresponds to the frame of the electronic device 100.

[0151] In some embodiments, during the fabrication of the flexible display panel 20, an etching barrier layer 204 can be first added to the bending region PB of a conventional flexible display panel (e.g., the substrate 104 of the flexible display panel 10) to obtain a new flexible display panel. Then, one or more grooves 108 are formed on the flexible support layer 201 at the bending region PB of the flexible display panel. For example, the grooves can be formed by etching processes such as laser etching, dry etching, and wet etching to obtain the grooved flexible display panel. The openings of the one or more grooves 108 face the side of the flexible support layer 201 that is away from the wiring layer 202.

[0152] It's understandable that flexible display panels are typically quite soft and difficult to transport. Therefore, the flexible support layer in a flexible display panel usually has a protective adhesive layer, such as a backsheet protective film, pasted on the side facing away from the wiring layer. When slotting the flexible support layer, the portion of the backsheet protective film pasted on the bending area of ​​the substrate can be removed first.

[0153] Next, a first adhesive 109 is applied to one or more grooves 108 and cured. Then, a third adhesive is applied to the back of the bending area PB, for example, on... Figure 4 The third adhesive is applied to the area between the first protective adhesive layer 105a and the second protective adhesive layer 105b on the side facing the opening of the groove 108 in the bending area PB shown in (1). The third adhesive 110 is cured after the substrate 104' is bent.

[0154] Afterwards, combined Figure 3 As shown, a polarizer 103 is bonded above the cover layer 203 in the first non-bending area PD and the display area PV of the flexible display panel. An optically transparent adhesive layer 102 is bonded above the polarizer 103, and a glass cover plate 101 is bonded above the optically transparent adhesive layer 102. Graphite is coated on the back side of the glass cover plate 101 to form a light-shielding area 106. Thus, the flexible display panel 20 provided in this embodiment of the application can be obtained.

[0155] It is understood that the third colloid 110 is located in the first space formed by the bending area PB and the first protective adhesive layer 105a and the second protective adhesive layer 105b. After the third colloid 110 is cured, it can support the bending area PB of the flexible display panel 20, thereby improving the impact resistance of the flexible display panel 20.

[0156] For example, a top view of the flexible display panel 20 provided in this application embodiment applied in a smartwatch can be referred to. Figure 8 As shown. The display area PV of the flexible display panel 20 can be circular. The first non-bending area PD of the flexible display panel 20 can correspond to the position of the bezel of the smartwatch. When manufacturing the flexible display panel 20, the bending area PB can be bent so that the second non-bending area PT is bent to the back of the display area PV.

[0157] The specific embodiments described above illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details have been omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0158] In the description of this application, it should be noted that the terms "upper", "lower", "left", "right", "outer surface", "inner surface", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0159] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "fit" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0160] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A flexible display panel, characterized in that, The flexible display panel includes a bending region, the bending region comprising: Flexible support layer; A wiring layer, wherein the wiring layer and the flexible support layer are stacked together along the thickness direction of the bending area; A cover layer, along the thickness direction of the bending area, is stacked on the side of the wiring layer facing away from the flexible support layer; The flexible support layer has one or more grooves, the openings of which face the side of the flexible support layer away from the wiring layer; and the distance between the wiring layer and the neutral layer of the bending region is less than a first value along the thickness direction of the bending region.

2. The flexible display panel according to claim 1, characterized in that, The first value is 5 micrometers to 8 micrometers.

3. The flexible display panel according to claim 1 or 2, characterized in that, The groove is filled with a first colloid, which is connected to the bottom wall of the groove.

4. The flexible display panel according to claim 3, characterized in that, The first colloid fills the groove to a depth of 0.1 to 1 times the depth of the groove.

5. The flexible display panel according to claim 3 or 4, characterized in that, The first colloid is MCL adhesive.

6. The flexible display panel according to any one of claims 3 to 5, characterized in that, The side of the wiring layer facing away from the flexible support layer does not include MCL adhesive.

7. The flexible display panel according to any one of claims 3 to 5, characterized in that, The flexible display panel also includes a second colloid, which is located on the side of the wiring layer opposite to the flexible support layer. The second colloid is an MCL adhesive, and the thickness of the second colloid is less than the thickness of the first colloid.

8. The flexible display panel according to any one of claims 1 to 7, characterized in that, The flexible display panel also includes an etching barrier layer, which is stacked between the flexible support layer and the wiring layer.

9. The flexible display panel according to any one of claims 1 to 8, characterized in that, The overlay includes an isolation and protection layer, which is bonded to the wiring layer.

10. The flexible display panel according to any one of claims 1 to 9, characterized in that, The cross-sectional shape of the groove can be any one of the following: rectangular, rounded rectangle, racetrack shape, circle, polygon, or irregular shape.

11. The flexible display panel according to any one of claims 1 to 10, characterized in that, The ratio of the sum of the cross-sectional areas of the one or more grooves to the area of ​​the bending region is between 1 and 0.

1.

12. The flexible display panel according to any one of claims 1 to 11, characterized in that, Along the length of the flexible display panel, the flexible display panel includes a first non-bending area, a bending area and a second bending area connected in sequence. The bending area has an arc-shaped structure, such that the first non-bending area and the second non-bending area are arranged opposite to each other along a first direction, which is parallel to the thickness direction of the first non-bending area. The arc-shaped structure forms a first space, which is filled with a third colloid.

13. The flexible display panel according to claim 12, characterized in that, The third colloid is epoxy resin.

14. The flexible display panel according to claim 12 or 13, characterized in that, The flexible display panel further includes a first protective adhesive layer and a second protective adhesive layer. The first protective adhesive layer is adhered to the surface of the first non-bending area facing the second non-bending area, and the second protective adhesive layer is adhered to the surface of the second non-bending area facing the first non-bending area. The first protective adhesive layer and the second protective adhesive layer are bonded together.

15. The flexible display panel according to any one of claims 1 to 14, characterized in that, The bending radius of the bending zone is less than or equal to 0.1 mm.

16. An electronic device, characterized in that, It includes a housing and a flexible display panel as described in any one of claims 1 to 15, wherein the flexible display panel is disposed on the housing.

Images