Display panel and display device

Abstract

The invention discloses a display panel and a display device, and belongs to the technical field of display, a frame area of the display panel comprises a first area, a second area and a touch control wiring area which are sequentially arranged in the extending direction of the edge of a display area, the display panel comprises a supporting layer and a retaining wall which are located on a pixel definition layer, the retaining wall surrounds the display area of the display panel, and the supporting layer is located on the pixel definition layer. Comprising a first flat part and a first supporting part which are located in the first area, a second flat part and a second supporting part which are located in the second area, and a third flat part and a third supporting part which are located in the touch wiring area, and the supporting layer extends to the first area, the second area and the third area and is located on the first flat part, the second flat part and the third flat part. A first supporting part, a second supporting part and a third supporting part are formed respectively. According to the display panel disclosed by the invention, on the basis of considering the reliability of the touch routing in the touch routing area, the organic material can be effectively prevented from leaking or overflowing in the touch routing area and near the touch routing area.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display panel and display device. Background Technology

[0002] The bezel area of ​​an Organic Light Emitting Display (OLED) panel typically includes a touch trace area for laying drive signal lines, touch signal lines, or other functional touch traces.

[0003] Because it is necessary to form metal touch traces within the touch trace area and ensure that these metal touch traces cross the height difference between different functional layers, the touch trace area often has a special film layer stacking structure.

[0004] However, due to the unique film layer stacking structure of the touch wiring area, leakage or overflow of organic materials from inkjet printing (IJP) is prone to occur near the touch wiring area, thus affecting the display uniformity and product yield of the OLED display panel. Therefore, how to avoid leakage or overflow of organic materials near the touch wiring area while ensuring the reliability of the touch wiring within the touch wiring area is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] A display panel and a display device are provided to solve the above-mentioned technical problems.

[0006] A display panel has a display area and a border area surrounding the display area. The border area includes a first area, a second area, and a touch wiring area sequentially arranged along the edge of the display area. The display panel has a retaining wall surrounding the display area, including a first flat portion and a first supporting portion located in the first area, a second flat portion and a second supporting portion located in the second area, and a third flat portion and a third supporting portion located in the touch wiring area. The top surface of the second flat portion is lower than the top surface of the first flat portion and the top surface of the third flat portion. The display panel includes: Pixel definition layer; A support layer is located on the pixel definition layer. The display panel includes a barrier wall surrounding the display area. The barrier wall includes a first flat portion and a first support portion located in the first area, a second flat portion and a second support portion located in the second area, and a third flat portion and a third support portion located in the touch wiring area. The top surface of the second flat portion is lower than the top surface of the first flat portion and the top surface of the third flat portion. The support layer extends to the first area and the second area, and the first support portion and the second support portion are formed on the first flat portion and the second flat portion, respectively. The display panel further includes touch traces that cross the third flat portion in the touch trace area and extend into the display area from the border area. The support layer also extends to the touch trace area and forms the third support portion on the third flat portion. The third support portion and the touch traces are spaced apart in the extension direction along the edge of the display area.

[0007] Optionally, the top surface of the third support is lower than the top surface of the first support.

[0008] Optionally, the top surface of the third flat portion is lower than the top surface of the first flat portion.

[0009] Optionally, the sidewall of the third support near the touch trace is inclined away from the touch trace in the direction extending along the edge of the display area.

[0010] Optionally, the display panel further includes at least one planarization layer, the pixel definition layer being located on the at least one planarization layer, the at least one planarization layer extending to the first area, the second area and the touch trace area, respectively forming the first planarization portion, the second planarization portion and the third planarization portion.

[0011] Optionally, the at least one flattening layer includes a first flattening layer, a second flattening layer, and a third flattening layer, wherein the first flattening portion is formed by stacking the first flattening layer and the second flattening layer, the second flattening portion is formed by the second flattening layer within the second region, and the third flattening portion is formed by stacking the second flattening layer and the third flattening layer.

[0012] Optionally, a groove structure is provided on the top surface of the second support.

[0013] Optionally, the width of the second flat portion can be in the range of 150-300 μm.

[0014] Optionally, the width of the third support portion can be in the range of 50-150 μm.

[0015] Optionally, the distance between the third support and the touch trace can range from 150 to 300 μm.

[0016] The display panel in this application features a second zone serving as a terrain buffer next to the touch trace area within the bezel region. Through a zoned design, different heights of flat sections are used in different areas of the bezel, combined with support layers forming support sections within these areas. This allows for a gradual transition of the terrain around the touch trace area, preventing abrupt changes in the terrain and improving the continuity and smoothness of the terrain. It also prevents uncontrolled diffusion of inkjet-printed or vapor-deposited organic materials in and around the touch trace area due to abrupt terrain changes. While maintaining the reliability of the touch traces within the touch trace area, it effectively prevents leakage or overflow of organic materials in and around the touch trace area, improving display uniformity and product yield. The gradient structure of the flat sections in the first, second, and touch trace areas also provides good support for the bezel region, thereby enhancing the mechanical strength of the display panel.

[0017] Furthermore, in the display panel of this application, the support layer extends continuously to the first area, the second area, and the touch wiring area to form corresponding support portions, making the film layer stacking in and near the touch wiring area smoother. This is beneficial for the controlled diffusion and uniform film formation of organic materials, and can improve the display quality at the edge of the display area. The second flat portion is lower in height than the first flat portion and the third flat portion, which can form an intermediate buffer zone near the touch wiring area. This can make the diffusion environment of organic materials near the touch wiring area more stable, and can further reduce the risk of organic material leakage or overflow caused by abrupt changes in the terrain near the touch wiring area. The third support portion is spaced apart from the touch wiring that crosses the third flat portion, which can effectively prevent the touch wiring from contacting the third support portion when crossing the third flat portion due to uneven film layer stacking, thermal expansion and contraction, or subsequent process offset, thereby improving the electrical and mechanical reliability of the touch wiring. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0020] Figure 1 This is a top view of a display panel provided as an exemplary embodiment of the present disclosure.

[0021] Figure 2This is a partially enlarged top view of a display panel provided as an exemplary embodiment of the present disclosure.

[0022] Figure 3 This is a partial structural diagram of a display panel provided in an exemplary embodiment of the present disclosure.

[0023] Figure label: 100: Display panel; 11: Display area; 12: Bezel area; 13: First area; 14: Second area; 15: Touch trace area; 16: Pixel definition layer; 17: Support layer; 19: First planar portion; 20: Second planar portion; 21: Third planar portion; 22: First support portion; 23: Second support portion; 24: Third support portion; 25: Touch trace; 26: Substrate; 27: Active layer; 28: Gate insulating layer; 29: Dielectric layer; 30: Passivation layer; 42: First planarization layer; 43: Second planarization layer; 44: Third planarization layer; 45: Groove structure. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0025] In the embodiments of this application, "at least one" refers to one or more; "multiple" refers to two or more. In the description of this application, the terms "first," "second," "third," etc., are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0026] References such as “one embodiment” or “some embodiments” described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the terms “comprising,” “including,” “having,” and variations thereof, in this specification, mean “including but not limited to,” unless otherwise specifically emphasized.

[0027] It should be noted that in the embodiments of this application, "and / or" describes the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after it are in an "or" relationship.

[0028] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0029] It should be noted that with the rapid development of organic light-emitting display technology, the resolution, panel stacking structure and functional integration of OLED display panels are constantly improving. Especially in display panels using inkjet printing technology, the requirements for ink application accuracy and overflow control of organic materials are becoming increasingly stringent.

[0030] Therefore, OLED display panels typically incorporate a barrier structure (Dam) to limit the landing point of organic material droplets within the encapsulation layer and suppress the flow of organic material out of the encapsulation layer.

[0031] However, with the increasing complexity of panel layers, functional film layers, and touch wiring, the design and manufacturing of barrier structures face new challenges.

[0032] Taking the 3SD+PLP (triple-source drain metal layer + depolarizer technology) architecture OLED display panel as an example, this complex architecture adds multiple planarization layers (such as PLN3, PLN4, etc.) and a black pixel definition layer (BPDL), significantly increasing its process flow compared to conventional architecture OLED display panels. Due to the increased number of process flows in this complex architecture, the thinner thickness of some organic film layers, and the possibility of further film thinning during the ashing process, if the blocking structure of a conventional OLED display panel is still used, its overall height may be too low, making it difficult to effectively prevent the overflow of organic materials.

[0033] Meanwhile, in the bezel area of ​​the OLED display panel, there is a touch trace area that needs to be laid out. Since it is necessary to form metal touch traces in the touch trace area and ensure that the metal touch traces cross the height difference between different functional layers, if the blocking structure of the touch trace area is too high, it will cause the touch traces to break. Therefore, the touch trace area often has a special film layer stacking structure.

[0034] Consequently, differences in the stacking and height of the barrier film layers appear near the touch trace area of ​​the OLED display panel. This results in discontinuities or localized weakening of the barrier capability near the touch trace area, making it prone to leakage or overflow of organic materials. Consequently, this affects the display uniformity and product yield of the OLED display panel. Therefore, how to avoid leakage or overflow of organic materials near the touch trace area while ensuring the reliability of the touch traces within the touch trace area is a pressing technical problem that needs to be solved in this field.

[0035] Figure 1 This is a top view of a display panel provided as an exemplary embodiment of the present disclosure. Figure 2 This is a partially enlarged top view of a display panel provided as an exemplary embodiment of this disclosure. Please refer to... Figures 1 to 2 The display panel 100 has a display area 11 and a border area 12 surrounding the display area 11. The border area 12 includes a first area 13, a second area 14 and a touch wiring area 15 arranged sequentially along the extension direction of the edge of the display area 11.

[0036] Figure 3 This is a partial structural diagram of a display panel 100 provided in an exemplary embodiment of this disclosure. Please refer to... Figure 3 The display panel 100 includes: a substrate 26; at least one planarization layer located on the substrate 26, including a first planarization portion 19 located in the first region 13, a second planarization portion 20 located in the second region 14, and a third planarization portion 21 located in the touch trace region 15, wherein the second planarization portion 20 is located away from the surface of the substrate 26 and is lower than the surface of the first planarization portion 19 away from the substrate 26 and the surface of the third planarization portion 21 away from the substrate 26 along the thickness direction of the display panel 100; a pixel definition layer 16 located on the at least one planarization layer; and a support layer 17 located on the pixel definition layer 16, including a first support portion 22 located on the first planarization portion 19, a second support portion 23 located on the second planarization portion 20, and a third support portion 24 located on the third planarization portion 21.

[0037] The display panel 100 further includes a touch trace 25, which crosses the third flat portion 21 in the touch trace area 15 and extends into the display area 11 from the border area 12. The third support portion 24 and the pixel definition layer 16 are spaced apart from the touch trace 25 along the extension direction of the touch trace near the edge of the display area 11.

[0038] Specifically, display area 11 is the area where multiple sub-pixels and pixel driving circuits are set for display. Border area 12 is the area located outside display area 11 that is not used for displaying the image.

[0039] The touch routing area 15 in the border area 12 is the area where touch routing 25 is set.

[0040] It is understood that the position and number of touch wiring areas 15 in this embodiment can be determined based on the layout of touch wiring 25.

[0041] Please see Figure 3The display panel 100 in this embodiment also includes a substrate 26, a thin film transistor layer, at least one planarization layer, and an anode layer.

[0042] The substrate 26 can be made of materials such as glass, quartz, or polyimide.

[0043] A thin-film transistor layer is disposed on a substrate 26. The thin-film transistor layer may include: a first conductive layer on the substrate 26, the first conductive layer including the gate of the thin-film transistor; a gate insulating layer 28 covering the gate; an active layer 27 disposed on the gate insulating layer 28; a second conductive layer disposed on the active layer 27, the second conductive layer including the source and drain of the thin-film transistor; and a passivation layer 30 disposed on the second conductive layer.

[0044] At least one planarization layer is located on the thin-film transistor layer.

[0045] An anode layer is located on at least one planarization layer and includes an anode. The anode passes through at least one planarization layer and is connected to one of the source and drain of the thin-film transistor.

[0046] The pixel definition layer 16 is located on the anode layer, and a pixel definition hole is provided in the display area 11 to expose the anode.

[0047] Optionally, the distance between the pixel definition layer 16 and the touch trace 25 can range from 150 to 300 μm.

[0048] Optionally, the distance between the boundary of the pixel definition layer 16 near the touch trace 25 and the boundary of the third support portion 24 near the touch trace 25 is in the range of 50-150 μm, to prevent gap areas not covered by the pixel definition layer 16 from existing between the third flat portion 21 and the third support portion 24. However, such gap areas lack effective limitation on the deposition range of organic materials, potentially leading to leakage or overflow of organic materials within these gap areas.

[0049] Optionally, the planarization layer can be made of organic materials. These organic materials may include, but are not limited to, acrylic resin, polyimide (PI), benzocyclobutene (BCB), epoxy negative photoresist (SU-8), and photosensitive resin.

[0050] This embodiment extends from at least one planarization layer to the first area, the second area, and the touch wiring area, forming a first planarization portion, a second planarization portion, and a third planarization portion, respectively. This can improve the compatibility of the barrier structure process and provide a stable and controllable base platform for the layout of the pixel definition layer and touch wiring.

[0051] Since touch traces 25 are formed within the touch trace area 15, the second area 14 adjacent to the touch trace area 15 and the first area 13 adjacent to the second area 14 constitute the area near the touch trace area 15. The touch trace area 15, the second area 14, and the first area 13 are prone to leakage or overflow of organic materials, which can affect the display uniformity and product yield of the display panel 100. Therefore, in this embodiment, the film layer stacking in the first area 13, the second area 14, and the touch trace area 15 has been improved to prevent leakage or overflow of organic materials in these areas, thereby improving the display uniformity and product yield of the display panel 100.

[0052] It is understood that, in this embodiment, the first area 13, the second area 14, and the touch wiring area 15 can be located within the border area 12 below the display panel 100, and the first area 13, the second area 14, and the touch wiring area 15 can also be located within the border area 12 on the left and / or right sides of the display panel 100. In this embodiment, the specific locations of the first area 13, the second area 14, and the touch wiring area 15 are not limited.

[0053] Optionally, when there are multiple touch routing areas 15, a second area 14 is provided on both sides of each touch routing area 15, and a touch routing area 15 and a first area 13 are respectively provided on both sides of the second area 14. For example, when there are two touch routing areas 15, please refer to [link to relevant documentation]. Figure 3 The border area 12 may include a first area 13, a second area 14, a touch wiring area 15, a second area 14, a first area 13, a second area 14, a touch wiring area 15, and a second area 14 arranged sequentially along the extension direction of the edge of the display area 11.

[0054] Please see Figure 3 The first support portion 22 in the support layer 17 of the first zone 13 covers the first flat portion 19, the second support portion 23 in the support layer 17 of the second zone 14 covers the second flat portion 20, and the third support portion 24 in the support layer 17 of the touch wiring zone 15 partially covers the third flat portion 21.

[0055] Optionally, the support layer 17 is adapted to support a photomask for depositing the luminescent layer material. The material of the support layer 17 can be an organic material. The aforementioned organic materials may include, but are not limited to, acrylic resin, polyimide (PI), benzocyclobutene (BCB), epoxy negative photoresist (SU-8), and photosensitive resin.

[0056] It is understandable that the first flat portion 19, the first support portion 22, the second flat portion 20, the second support portion 23, the third flat portion 21, and the third support portion 24 together constitute the retaining wall structure within the frame area.

[0057] In this embodiment, the display panel has a second zone serving as a terrain buffer next to the touch wiring area within the bezel region. Through this zoned design, different heights of flat sections are used in different areas of the bezel, combined with support layers formed in different areas. This allows for a gradual transition of the terrain around the touch wiring area, preventing abrupt changes in the terrain and improving the continuity and smoothness of the terrain. It also prevents uncontrolled diffusion of inkjet-printed or vapor-deposited organic materials in and around the touch wiring area due to abrupt terrain changes. While ensuring the reliability of the touch wiring within the touch wiring area, it effectively prevents leakage or overflow of organic materials in and around the touch wiring area, improving display uniformity and product yield. The gradient structure of the flat sections in the first, second, and touch wiring areas also provides good support for the bezel region, thereby increasing the mechanical strength of the display panel.

[0058] Furthermore, in this embodiment, the support layer of the display panel forms corresponding support portions in the first area, the second area, and the touch wiring area, making the film layer stacking in and near the touch wiring area smoother. This facilitates the controlled diffusion and uniform film formation of organic materials, improving the display quality at the edge of the display area. The second flat portion is lower in height than the first and third flat portions, forming an intermediate buffer zone near the touch wiring area. This makes the diffusion environment of organic materials near the touch wiring area more stable, further reducing the risk of organic material leakage or overflow caused by abrupt changes in the terrain near the touch wiring area. The third support portion is spaced apart from the touch wiring that crosses the third flat portion, effectively preventing the touch wiring from contacting the third support portion due to uneven film layer stacking, thermal expansion and contraction, or subsequent process offsets when crossing the third flat portion, thereby improving the electrical and mechanical reliability of the touch wiring.

[0059] Optionally, the first flat portion 19 is inclined along the edge of the display area 11 near the sidewall of the second flat portion 20 in a direction away from the second flat portion 20 in the extending direction along the edge of the display area 11.

[0060] Optionally, the third flat portion 21 is inclined along the edge of the display area 11 near the sidewall of the second flat portion 20 in a direction away from the second flat portion 20 in the extending direction along the edge of the display area 11.

[0061] As an alternative embodiment, the third support portion 24 is located away from the surface of the substrate 26 and is lower than the surface of the first support portion 22 away from the substrate 26 in the thickness direction of the display panel 100.

[0062] Optionally, the thickness of the first support portion 22 ranges from 1.9 to 2.1 μm. The thickness of the third support portion 24 also ranges from 1.9 to 2.1 μm. However, the thickness of the third support portion 24 is less than the thickness of the first support portion, that is, the surface of the third support portion 24 away from the substrate 26 is lower than the surface of the first support portion 22 away from the substrate 26 along the thickness direction of the display panel 100.

[0063] Optionally, the thickness of the second support portion 23 can be in the range of 1.63-1.67 μm.

[0064] In this embodiment, the surface of the third support portion away from the substrate is lower than the surface of the first support portion away from the substrate along the thickness direction of the display panel. This makes the height of the barrier structure near the touch trace lower than the height of the barrier structure away from the touch trace. This allows a stepped barrier structure to be formed from the touch trace area along the edge of the display area, thereby further mitigating the abrupt change in the barrier terrain of the touch trace area. It can cooperate with the second support portion and the first support portion to more effectively prevent organic materials from leaking or overflowing in and around the touch trace area. Furthermore, compared to the first support portion, the height of the third support portion and the second support portion near the touch trace is lower, which makes it easier to absorb the deformation of the third support portion and the second current extension section under mechanical bending or thermal stress, rather than directly transferring the stress to the touch trace, thereby further improving the reliability of the touch trace.

[0065] As an alternative embodiment, the third flat portion 21 is located away from the surface of the substrate 26 and is lower than the surface of the first flat portion 19 away from the substrate in the thickness direction of the display panel 100.

[0066] Optionally, the thickness of the first flat portion 19 ranges from 3.3 to 3.7 μm. The thickness of the third flat portion 21 ranges from 2.8 to 3.2 μm. The thickness of the third flat portion 21 is less than the thickness of the first flat portion 19, that is, the surface of the third flat portion 21 away from the substrate 26 is lower than the surface of the first flat portion 19 away from the substrate along the thickness direction of the display panel 100.

[0067] Preferably, the thickness of the first flat portion 19 is 3.5 μm.

[0068] Preferably, the thickness of the second flat portion 20 is 3 μm.

[0069] Optionally, the thickness of the second flat portion 20 ranges from 1.3 to 1.7 μm.

[0070] Preferably, the thickness of the second flat portion 20 is 1.5 μm.

[0071] In this embodiment, the surface of the third flat portion away from the substrate is lower than the surface of the first flat portion away from the substrate along the thickness direction of the display panel, which can improve the compatibility of the touch wiring area process and the stability of film layer stacking.

[0072] As an optional embodiment, the width of the second flat portion 20 is in the range of 150-300 μm.

[0073] In this embodiment, the width of the second flat portion ranges from 150 to 300 μm. This ensures that the second flat portion 20 has sufficient lateral width to buffer the diffusion of organic material droplets while maintaining sufficient stability. This provides a larger process window for the upper film layer, thereby improving the process stability and product yield of the display panel.

[0074] As an optional embodiment, the width of the third support portion 24 is in the range of 50-150 μm.

[0075] Understandably, the width of the third support portion 24 is smaller than the width of the second support portion 23. In this embodiment, the width of the third support portion ranges from 50 to 150 μm, which enables the third support portion to achieve the best balance between blocking effect and structural occupation. The third support portion and the second support portion can form a lateral buffer zone from narrow to wide, which can reduce the impact of stress on the touch wiring area and the vicinity of the touch wiring area, thereby improving the reliability of the touch wiring and making it highly manufacturable.

[0076] As an alternative embodiment, the touch trace 25 is located on the third flat portion 21, and the side wall of the third support portion 24 near the touch trace 25 is inclined in a direction away from the touch trace 25.

[0077] Optionally, the tilt angle of the side wall of the third support 24 near the touch trace 25 toward the direction away from the touch trace 25 is in the range of 45°-60°.

[0078] In this embodiment, the touch trace is located on the third flat portion. The side wall of the third support portion near the touch trace is inclined away from the touch trace along the extension direction of the edge of the display area. This prevents the organic material from accumulating or flowing back due to the vertical baffle structure, avoiding defects such as edge accumulation, liquid accumulation, and liquid hanging next to the baffle structure. This further improves the control of the landing point of the organic material. Furthermore, the inclination of the side wall of the third support portion near the touch trace along the extension direction of the edge of the display area away from the touch trace further mitigates the abrupt change in the topography of the baffle in the touch trace area, thereby better preventing leakage or overflow of organic material in and around the touch trace area.

[0079] As an optional embodiment, the distance between the third support portion 24 and the touch trace 25 is greater than the width of the third support portion 24.

[0080] Optionally, the distance between the third support 24 and the touch trace 25 can be in the range of 200-450μm.

[0081] In this embodiment, the distance between the third support and the touch wiring is greater than the width of the third support. This ensures that a sufficient isolation zone is formed between the retaining wall structure in the frame area and the touch wiring. It also ensures that the touch wiring only needs to pass through the third flat part when it is laid out, without having to pass through the third support with a greater height difference. This effectively avoids the risk of touch wiring breakage and also effectively avoids the third support from contaminating the touch wiring during the fabrication of the third support. It achieves an effective balance between organic material blocking, terrain transition, and process compatibility.

[0082] As an optional embodiment, the second support portion 23 is provided with a groove structure 45 on the side away from the substrate 26.

[0083] Optionally, the two sidewalls of the groove structure 45 are inclined toward the interior of the groove structure 45.

[0084] Optionally, the inclination angle of the sidewall of the groove structure 45 is in the range of 30°-50°.

[0085] It should be noted that the inclination angles of the two sidewalls of the groove structure 45 can be the same or different.

[0086] In this embodiment, a groove structure is provided on the side of the second support part away from the substrate, which can form a buffer recess between the first area and the touch wiring area, preventing organic materials from directly climbing to the first support part, enhancing the control of the flow of organic light-emitting materials in the second area, and preventing stress accumulation in the baffle structure in the frame area through the height difference between the first support part, the second support part and the third support part, thereby improving the reliability of the film structure in the frame area.

[0087] As an optional embodiment, at least one flattening layer includes a first flattening layer 42, a second flattening layer 43 and a third flattening layer 44, the first flattening portion 19 is formed by stacking the first flattening layer 42 and the second flattening layer 43, the second flattening portion 20 is formed by the second flattening layer 43 in the second region 14, and the third flattening portion 21 is formed by stacking the second flattening layer 43 and the third flattening layer 44.

[0088] Specifically, the first flat portion 19, the second flat portion 20 and the third flat portion 21 in this embodiment can be formed by the following steps: First, a first flat layer 42 is formed in the first region 13.

[0089] Next, a second flattening layer 43 is formed in the first region 13, the second region 14 and the third region, the second flattening layer 43 covers the first flattening layer 42, a first flattening portion 19 is formed in the first region 13 by stacking the first flattening layer 42 and the second flattening layer 43, and the second flattening layer 43 in the second region 14 forms a second flattening portion 20.

[0090] Finally, a third flat layer 44 is formed in the third region, which partially covers the second flat layer 43, and a third flat portion 21 is formed in the third region by stacking the third flat layer 44 and the second flat portion.

[0091] Optionally, the thickness of the first planarization layer 42 can be in the range of 1.8-2.2 μm.

[0092] Preferably, the thickness of the first planarization layer 42 is in the range of 2 μm.

[0093] Optionally, the thickness of the second flattening layer 43 can be in the range of 1.3-1.7 μm.

[0094] Preferably, the thickness of the second planarization layer 43 is in the range of 1.5 μm.

[0095] Optionally, the thickness of the third planarization layer 44 can be in the range of 1.3-1.7 μm.

[0096] Preferably, the thickness of the third planarization layer 44 is in the range of 1.5 μm.

[0097] In this embodiment, the first flat portion is formed by stacking a first flat layer and a second flat layer, the second flat portion is formed by the second flat layer in the second region, and the third flat portion is formed by stacking a second flat layer and a third flat layer. By combining different flat layers, the height relationship between the first flat portion, the second flat portion and the third flat portion can be precisely controlled, so that the first flat portion, the second flat portion and the third flat portion form a stepped transition, and the process is simple to implement.

[0098] As an optional embodiment, the display device further includes a light-emitting functional layer and an encapsulation layer, wherein the light-emitting functional layer is located in the display area 11 and on the substrate 26; and the encapsulation layer covers the light-emitting functional layer.

[0099] The encapsulation layer includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked sequentially. The first and second inorganic encapsulation layers extend from the display area 11 to the frame area 12 and across the barrier wall. The organic encapsulation layer is located on the side of the barrier wall closer to the display area 11.

[0100] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0101] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A display panel, characterized in that, It has a display area and a border area surrounding the display area, the border area including a first area, a second area and a touch wiring area arranged sequentially along the extension direction of the edge of the display area; substrate; At least one planarization layer is located on the substrate, including a first planarization portion located in the first region, a second planarization portion located in the second region, and a third planarization portion located in the touch trace region. The second planarization portion is located away from the surface of the substrate and is lower than the surface of the first planarization portion away from the substrate and the surface of the third planarization portion away from the substrate in the thickness direction of the display panel. A pixel definition layer is located on the at least one flat layer; A support layer, located on the pixel definition layer, includes a first support portion located on the first flat portion, a second support portion located on the second flat portion, and a third support portion located on the third flat portion; The display panel further includes touch traces, which cross the third flat portion in the touch trace area and extend into the display area from the border area. The third support portion and the pixel definition layer are spaced apart from the touch traces along the edge of the display area near the extension direction of the touch traces.

2. The display panel according to claim 1, characterized in that, The third support portion is located away from the surface of the substrate and is lower than the surface of the first support portion away from the substrate along the thickness direction of the display panel.

3. The display panel according to claim 1, characterized in that, The third flat portion is located away from the surface of the substrate and is lower than the first flat portion away from the surface of the substrate along the thickness direction of the display panel.

4. The display panel according to claim 1, characterized in that, The touch trace is located on the third flat portion, and the side wall of the third support portion near the touch trace is inclined in a direction away from the touch trace.

5. The display panel according to claim 1, characterized in that, The at least one flattening layer includes a first flattening layer, a second flattening layer, and a third flattening layer. The first flattening portion is formed by stacking the first flattening layer and the second flattening layer. The second flattening portion is formed by stacking the second flattening layer within the second region. The third flattening portion is formed by stacking the second flattening layer and the third flattening layer.

6. The display panel according to claim 1, characterized in that, The second support portion has a groove structure on the side away from the substrate.

7. The display panel according to any one of claims 1 to 6, characterized in that, The width of the second flat portion ranges from 150 to 300 μm.

8. The display panel according to any one of claims 1 to 6, characterized in that, The width of the third support portion ranges from 50 to 150 μm.

9. The display panel according to any one of claims 1 to 6, characterized in that, The distance between the third support and the touch trace is greater than the width of the third support.

10. A display device, characterized in that, include: The display panel as described in any one of claims 1 to 9.

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