Display panel, display device and preparation method of display panel

Abstract

The embodiment of the invention provides a display panel, a display device and a preparation method of the display panel. The display panel comprises a substrate; the first power supply signal line is arranged on the substrate; the conductive layer is arranged on the first power supply signal line and comprises a plurality of conductive parts, and the conductive parts are connected with the first power supply signal line; the pixel defining layer comprises a pixel defining part, a first opening and a second opening, the first opening and the second opening are formed in the pixel defining part, and the orthographic projection of the second opening on the substrate and the orthographic projection of the conductive part on the substrate are at least partially overlapped; the light-emitting layer is arranged on the side, where the conducting layer is located, of the substrate, the light-emitting layer comprises a plurality of light-emitting parts, and at least part of the light-emitting parts are located in the first opening; the dam part is arranged on the substrate and surrounds the conductive part; and the first electrode is arranged on one side, deviating from the substrate, of the light-emitting layer and the dam part and is connected with the conductive layer through the second opening. The display performance of the display panel can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a display panel, a display device, and a method for manufacturing a display panel. Background Art

[0002] Organic Light-Emitting Diode (OLED) display, also known as organic electroluminescent display. Compared with existing liquid crystal displays, it has a series of advantages such as autonomous luminescence, wide viewing angle, ultra-light, ultra-thin, high brightness, low power consumption and fast response, and the response speed can reach 1000 times that of liquid crystal displays. Therefore, OLED displays have become very popular flat-panel display products at home and abroad, with broad application prospects. Quantum dot (QD) materials have the advantages of high luminescent color purity, adjustable luminescent wavelength, stable materials, etc., and have significant advantages in the pursuit of high color gamut color display field.

[0003] Quantum-dots light emitting diode (QLED) is a new type of light-emitting device. Due to its self-luminous characteristics without the need for additional light sources, as well as its advantages such as narrow luminous peak, adjustable luminous color, and high luminous efficiency, QLED has gradually become one of the mainstream development directions of display technology in the future.

[0004] However, the display performance of current display products needs to be improved. Summary of the invention

[0005] The embodiments of the present application provide a display panel, a display device and a method for manufacturing a display panel, aiming to improve the display performance of the display panel.

[0006] An embodiment of the first aspect of the present application provides a display panel, comprising: a substrate; a first power signal line, arranged on the substrate; a conductive layer, arranged on the first power signal line and comprising a plurality of conductive parts, the conductive parts being interconnected with the first power signal line; a pixel definition layer, comprising a pixel defining part and a first opening and a second opening opened in the pixel defining part, the orthographic projection of the second opening on the substrate and the orthographic projection of the conductive part on the substrate at least partially overlapping; a light-emitting layer, arranged on the side of the substrate where the conductive layer is located, the light-emitting layer comprising a plurality of light-emitting parts, at least part of the light-emitting parts being located in the first opening; a dam part, arranged on the substrate and surrounding the conductive part, the material of the dam part being sparsely spaced from the material of the light-emitting part; a first electrode, arranged on the side of the light-emitting layer and the dam part facing away from the substrate and being interconnected with the conductive layer via the second opening.

[0007] According to an implementation of the first aspect of the present application, the dam portion is located on a side of the pixel defining portion away from the substrate and is arranged around the second opening.

[0008] According to any of the foregoing embodiments of the first aspect of the present application, the pixel defining portion includes a first sub-portion and a second sub-portion that are spaced apart from each other. The first opening is formed in the first sub-portion, the second opening is formed in the second sub-portion, and the dam portion is located on the side of the second sub-portion away from the substrate.

[0009] According to any of the foregoing embodiments of the first aspect of the present application, the dam portion has a first surface facing away from the substrate, and the first sub-portion has a second surface facing away from the substrate. The first surface is located on the side of the second surface away from the substrate.

[0010] According to any of the foregoing embodiments of the first aspect of the present application, the orthographic projection of the dam portion on the substrate is located within the second opening, and the dam portion is in direct contact with the substrate through the second opening.

[0011] According to any of the foregoing embodiments of the first aspect of the present application, an inner wall surface of the pixel defining portion facing the second opening and the dam portion are spaced apart.

[0012] According to any of the foregoing embodiments of the first aspect of the present application, the display panel includes a lapping region, and a plurality of lapping regions are distributed at intervals. The conductive portion is located in the lapping region.

[0013] According to any of the foregoing embodiments of the first aspect of the present application, the dam portion is located in the lapping region.

[0014] According to any of the foregoing embodiments of the first aspect of the present application, a plurality of conductive portions are distributed at intervals along the extending direction of the lapping region.

[0015] According to any of the foregoing embodiments of the first aspect of the present application, the orthographic projection of the conductive portion on the substrate is circular.

[0016] According to any of the foregoing embodiments of the first aspect of the present application, the orthographic projection of the dam portion on the substrate is annular.

[0017] According to any of the foregoing embodiments of the first aspect of the present application, the lapping region is strip-shaped, and a plurality of lapping regions are arranged side by side along a first direction and / or a second direction, and the first direction and the second direction intersect.

[0018] According to any of the foregoing embodiments of the first aspect of the present application, the extending dimension of the lapping region in the second direction is greater than its extending dimension in the first direction, and a plurality of lapping regions are arranged side by side along the first direction.

[0019] According to any of the foregoing embodiments of the first aspect of the present application, the width of the lapping region in the first direction is 10 μm to 50 μm, and the length of the lapping region in the first direction is greater than or equal to 10 μm.

[0020] According to any of the foregoing embodiments of the first aspect of the present application, the distance between two adjacent lapping regions is greater than or equal to 5 μm.

[0021] According to any of the foregoing embodiments of the first aspect of the present application, the display panel further includes a display area, and a plurality of overlapping areas are evenly distributed in the display area.

[0022] According to any of the foregoing embodiments of the first aspect of the present application, the overlapping area is square.

[0023] According to any of the foregoing embodiments of the first aspect of the present application, the distance between two adjacent overlapping areas is less than or equal to 50 μm, or the pitch between two adjacent overlapping areas is greater than or equal to 80 μm.

[0024] According to any of the foregoing embodiments of the first aspect of the present application, the dam portion has a bottom surface facing the substrate, and a side surface connected to the bottom surface and extending away from the substrate. The included angle between the side surface and the bottom surface is greater than or equal to 10° and less than or equal to 70°.

[0025] According to any of the foregoing embodiments of the first aspect of the present application, the thickness d of the dam portion 1 and the thickness d of the light-emitting portion 2 satisfy: d 1 ≥15d 2 .

[0026] According to any of the foregoing embodiments of the first aspect of the present application, the thickness d of the dam portion 1 is 200 nm to 10 μm.

[0027] According to any of the foregoing embodiments of the first aspect of the present application, the width of the dam portion is 2 μm to 10 μm.

[0028] According to any of the foregoing embodiments of the first aspect of the present application, a groove is provided on the surface of the conductive portion facing the first electrode.

[0029] According to any of the foregoing embodiments of the first aspect of the present application, a plurality of grooves are arranged at intervals.

[0030] According to any of the foregoing embodiments of the first aspect of the present application, the groove is formed by extending in a first direction, and a plurality of grooves are arranged side by side in a second direction.

[0031] According to any of the foregoing embodiments of the first aspect of the present application, it further includes: a second electrode layer located on the side of the pixel definition layer facing the substrate. The second electrode layer includes second electrodes corresponding to each first opening.

[0032] The conductive portion and the second electrode are provided on the same layer; or, a planarization layer is further provided on the substrate. The planarization layer is located on the side of the second electrode layer facing away from the pixel definition layer, and the conductive layer is located on the side of the planarization layer facing away from the second electrode layer. A communication hole is formed in the planarization layer, and the first electrode is connected to the conductive portion through the communication hole.

[0033] According to any of the foregoing embodiments of the first aspect of the present application, the conductive portion is in contact connection with the first power supply signal line; alternatively, the conductive layer is via-hole connected to the first power supply signal line.

[0034] According to any of the foregoing embodiments of the first aspect of the present application, the surface of the dam portion facing away from the substrate is a low-energy surface that is hydrophobic and / or oleophobic.

[0035] An embodiment of the second aspect of the present application further provides a display device, including the display panel provided in any of the foregoing embodiments of the first aspect.

[0036] An embodiment of the third aspect of the present application further provides a method for manufacturing a display panel, including:

[0037] Providing a conductive material layer on a substrate, and performing a patterning process on the conductive material layer to form a first power supply signal line;

[0038] Continuing to provide a conductive material layer on the substrate with the first power supply signal line, and performing a patterning process on the conductive material layer to form a conductive layer, the conductive layer including a plurality of conductive portions located on the side of the first power supply signal line facing away from the substrate;

[0039] Providing a pixel definition material layer on the substrate, and performing a patterning process on the pixel definition material layer to form a first opening and a second opening, at least part of the conductive portions being exposed by the second opening;

[0040] Providing a hydrophobic material layer on the substrate, and performing a patterning process on the hydrophobic material layer to obtain a dam portion surrounding the conductive portions;

[0041] Continuing to prepare a light-emitting layer on the substrate, the light-emitting layer including a plurality of light-emitting portions, at least part of the light-emitting portions being located in the first opening;

[0042] Continuing to prepare a first electrode on the substrate, the first electrode being interconnected with the conductive portions via the second opening.

[0043] According to the embodiment of the third aspect of the present application, the display panel includes an overlapping area, the light-emitting portion includes a communication opening located in the overlapping area, the conductive portion is disposed in the overlapping area, the extension dimension of the overlapping area in the first direction is greater than its extension dimension in the second direction, and in the step of continuing to prepare the light-emitting layer on the substrate:

[0044] Moving a plurality of nozzles arranged side by side in the first direction to coat a light-emitting material on the substrate, and closing one or more adjacent nozzles for a preset period of time to form a light-emitting portion including a communication opening in the overlapping area.

[0045] In the display panel provided by the embodiment of the present application, the display panel includes a substrate, a first power signal line, a conductive layer, a pixel definition layer, a light-emitting layer, a dam portion, and a first electrode. The light-emitting portion of the light-emitting layer is disposed in a first opening formed in the pixel defining portion. By means of the pixel defining portion, the problem of color crosstalk between different light-emitting portions can be improved. A second opening is further provided on the pixel defining portion. At least a part of the orthographic projection of the second opening on the substrate overlaps with the orthographic projection of the conductive portion on the substrate, so that the conductive portion can be exposed through the second opening, and the first electrode and the conductive portion can be connected to each other through the second opening. The conductive portion of the conductive layer is connected to the first power signal line. Therefore, the first electrode can be connected to the first power signal line through the conductive portion, which can improve the problem of excessive voltage drop of the first electrode and improve the display effect of the display panel. In addition, a dam portion is further provided on the substrate, and the dam portion surrounds the conductive portion. The material of the dam portion is hydrophobic to the material of the light-emitting portion. When preparing the light-emitting portion, through the blocking and hydrophobic effects of the dam portion, the overflow of the material of the light-emitting portion onto the conductive portion can be improved, which affects the electrical connection between the first electrode and the conductive portion, can improve the connection yield between the first electrode and the conductive portion, better improve the voltage drop problem of the first electrode, and improve the display effect of the display panel. Therefore, the embodiment of the present application can improve the display performance of the display panel by providing the dam portion. Description of the Drawings

[0046] By reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, other features, objects, and advantages of the present application will become more apparent, wherein the same or similar reference numerals represent the same or similar features.

[0047] Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present application;

[0048] Figure 2 is an example Figure 1 a cross-sectional view taken along line A-A;

[0049] Figure 3 is another example Figure 1 a cross-sectional view taken along line A-A;

[0050] Figure 4 is a partial enlarged schematic structural diagram of a display panel provided by an embodiment of the present application;

[0051] Figure 5 is yet another example Figure 1 a cross-sectional view taken along line A-A;

[0052] Figure 6 is a schematic structural diagram of the conductive portion and the dam portion of a display panel provided by an embodiment of the present application;

[0053] Figure 7It is a schematic structural diagram of a conductive part and a dam part of a display panel provided by another embodiment of the present application;

[0054] Figure 8 It is a schematic structural diagram of a conductive part and a dam part of a display panel provided by still another embodiment of the present application;

[0055] Figure 9 It is a schematic structural diagram of a display panel provided by another embodiment of the present application;

[0056] Figure 10 It is an enlarged schematic structural diagram of a dam part of a display panel provided by an embodiment of the present application;

[0057] Figure 11 In still another example Figure 1 It is a cross-sectional view taken along line A-A;

[0058] Figure 12 It is a partial cross-sectional view of a conductive part of a display panel provided by an embodiment of the present application;

[0059] Figure 13 It is a partial enlarged view of a conductive part of a display panel provided by an embodiment of the present application;

[0060] Figure 14 It is a partial cross-sectional view of a conductive part of a display panel provided by another embodiment of the present application;

[0061] Figure 15 In still another example Figure 1 It is a cross-sectional view taken along line A-A;

[0062] Figure 16 It is a schematic structural diagram of a light-emitting part of a display panel provided by an embodiment of the present application;

[0063] Figure 17 It is a flowchart of a method for manufacturing a display panel provided by an embodiment of the present application;

[0064] Figures 18 to 22 It is a schematic structural diagram of a manufacturing process of a display panel provided by an embodiment of the present application.

[0065] Explanation of reference numerals:

[0066] 10. Display panel;

[0067] 100. Substrate;

[0068] 200. First power signal line;

[0069] 300. Conductive layer; 310. Conductive part; 311. Groove; 312. Protrusion; 312a. First segment; 312b. Second segment;

[0070] 400, Pixel Definition Layer; 401, Second Surface; 410, Pixel Definition Portion; 411, First Division; 412, Second Division; 420, First Opening; 430, Second Opening;

[0071] 500, Light Emitting Layer; 510, Light Emitting Portion; 511, Hole Injection Layer; 512, Hole Transport Layer; 513, Light Emitting Material Layer; 514, Electron Transport Layer;

[0072] 600, Dam Portion; 610, First Surface; 620, Bottom Surface; 630, Side Surface

[0073] 700, First Electrode;

[0074] 800, Second Electrode Layer; 810, Second Electrode;

[0075] 900, Planarization Layer; 910, Connecting Hole;

[0076] DA, Overlap Region; AA, Display Area; X, First Direction; Y, Second Direction; Z, Third Direction. Detailed Embodiments

[0077] The features and exemplary embodiments of each aspect of the present application will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application. In the drawings and the following description, at least some of the well-known structures and technologies are not shown in order to avoid unnecessarily obscuring the present application; and, for clarity, the dimensions of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0078] In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0079] The orientation terms used in the following description are all the directions shown in the figures, and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "mounted" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0080] To better understand the present application, the following will describe in detail the display panel, display device and preparation method of the display panel according to the embodiments of the present application in conjunction with Figures 1 to 22

[0081] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of a display panel 10 provided by an embodiment of the present application, Figure 2 and is a cross-sectional view taken along line A-A in an example Figure 1 .

[0082] As Figure 1 and Figure 2 shown, an embodiment of the first aspect of the present application provides a display panel 10. The display panel 10 includes a substrate 100, a first power signal line 200, a conductive layer 300, a pixel definition layer 400, a light-emitting layer 500, a dam portion 600 and a first electrode 700. The first power signal line 200 is disposed on the substrate 100; the conductive layer 300 is disposed on the first power signal line 200 and includes a plurality of conductive portions 310, and the conductive portions 310 are interconnected with the first power signal line 200; the pixel definition layer 400 includes a pixel defining portion 410 and a first opening 420 and a second opening 430 formed in the pixel defining portion 410, and at least a part of the orthographic projection of the second opening 430 on the substrate 100 overlaps with at least a part of the orthographic projection of the conductive portion 310 on the substrate 100; the light-emitting layer 500 is disposed on the side of the substrate 100 where the conductive layer 300 is located, and the light-emitting layer 500 includes a plurality of light-emitting portions 510, and at least some of the light-emitting portions 510 are located in the first opening 420; the dam portion 600 is disposed on the substrate 100 and surrounds the conductive portion 310, and the material of the dam portion 600 is immiscible with the material of the light-emitting portion 510; the first electrode 700 is disposed on the side of the light-emitting layer 500 and the dam portion 600 facing away from the substrate 100 and is interconnected with the conductive layer 300 via the second opening 430.

[0083] In the display panel 10 provided in the embodiment of the present application, the display panel 10 includes a substrate 100, a first power signal line 200, a conductive layer 300, a pixel definition layer 400, a light-emitting layer 500, a dam portion 600, and a first electrode 700. The light-emitting portion 510 of the light-emitting layer 500 is disposed in a first opening 420 formed in the pixel defining portion 410. By means of the pixel defining portion 410, the problem of color crosstalk between different light-emitting portions 510 can be improved. A second opening 430 is further provided on the pixel defining portion 410. At least a part of the orthographic projection of the second opening 430 on the substrate 100 overlaps with the orthographic projection of the conductive portion 310 on the substrate 100, so that the conductive portion 310 can be exposed by the second opening 430, and the first electrode 700 and the conductive portion 310 can be connected to each other via the second opening 430. The conductive portion 310 of the conductive layer 300 is connected to the first power signal line 200. Therefore, the first electrode 700 can be connected to the first power signal line 200 through the conductive portion 310, which can improve the problem of excessive voltage drop of the first electrode 700 and improve the display effect of the display panel 10. In addition, a dam portion 600 is further provided on the substrate 100. The dam portion 600 is disposed around the conductive portion 310. The material of the dam portion 600 is hydrophobic to the material of the light-emitting portion 510. When the light-emitting portion 510 is prepared, through the blocking and hydrophobic effects of the dam portion 600, the overflow of the material of the light-emitting portion 510 onto the conductive portion 310, which affects the electrical connection between the first electrode 700 and the conductive portion 310, can be improved, the connection yield between the first electrode 700 and the conductive portion 310 can be increased, the voltage drop problem of the first electrode 700 can be better improved, and the display effect of the display panel 10 can be improved. Therefore, the display performance of the display panel 10 can be improved by providing the dam portion 600 in the embodiment of the present application.

[0084] The fact that the material of the dam portion 600 is hydrophobic to the material of the light-emitting portion 510 means that the material of the dam portion 600 and the material of the light-emitting portion 510 are not easily soluble, the material of the light-emitting portion 510 is not easily retained on the dam portion 600, and the material of the dam portion 600 and the material of the light-emitting portion 510 repel each other. For example, the material of the dam portion 600 includes a hydrophobic material, and the material of the light-emitting portion 510 includes water, so that the material of the light-emitting portion 510 is not easily retained on the dam portion 600.

[0085] Optionally, the dam portion 600 has a low-energy surface that is hydrophobic and / or oleophobic, so that when the light-emitting portion 510 is prepared, through the blocking and hydrophobic effects of the dam portion 600, the overflow of the material of the light-emitting portion 510 onto the conductive portion 310, which affects the electrical connection between the first electrode 700 and the conductive portion 310, can be improved, and the connection yield between the first electrode 700 and the conductive portion 310 can be increased.

[0086] The first power signal line 200 can be, for example, a low-level power signal line or a negative voltage power signal line.

[0087] The conductive layer 300 can be disposed adjacent to the film layer where the first power signal line 200 is located, such that the conductive portion 310 is in contact connection with the first power signal line 200. Alternatively, other film layers can be provided between the conductive layer 300 and the first power signal line 200, and the conductive portion 310 and the first power signal line 200 can be connected through vias.

[0088] There are various ways to arrange the light-emitting portion 510. For example, the material of the light-emitting portion 510 includes ink, and the light-emitting portion 510 is prepared on the pixel definition layer 400 by processes such as inkjet printing and coating. The light-emitting portion 510 can be a quantum dot light-emitting diode. In other embodiments, the light-emitting portion 510 can also be an organic light-emitting diode or the like.

[0089] There are various ways to arrange the dam portion 600. For example, the material of the dam portion 600 includes hydrophobic materials, and the material of the dam portion 600 includes, but is not limited to, hydrophobic materials such as polyimide, epoxy resin, acrylic resin, silicone resin, silicon nitride, and silicon oxide. Or the material of the dam portion 600 includes strongly hydrophobic and / or oleophobic materials. For example, the material of the dam portion 600 includes group materials such as perfluoromethyl, perfluoroethyl, and perfluorobenzene. This enables the dam portion 600 to have good hydrophobic properties and improves the problem of the material of the light-emitting portion 510 overflowing onto the conductive portion 310. The hydrophobic material has hydrophobic properties, and the hydrophobic properties here refer to "hydrophobic and oleophobic" properties, which means that the liquid is not easily in contact with the dam portion 600. The hydrophobic property refers to not being easily in contact with the liquid, rather than simply not being easily in contact with water. The material of the dam portion 600 includes hydrophobic materials, making the surface of the dam portion 600 facing away from the substrate 100 a low-energy surface.

[0090] There are various ways to arrange the position of the dam portion 600. For example, in some alternative embodiments, the dam portion 600 is located on the side of the pixel defining portion 410 facing away from the substrate 100 and is disposed around the second opening 430.

[0091] In these alternative embodiments, the dam portion 600 is directly disposed on the pixel defining portion 410, such that the height of the dam portion 600 relative to the substrate 100 is greater than the height of the pixel defining portion 410 relative to the substrate 100, and the dam portion 600 protrudes from the pixel defining portion 410. And the dam portion 600 is disposed around the second opening 430. When the light-emitting material overflows to the periphery of the dam portion 600, the dam portion 600 can block the light-emitting material outside the second opening 430, better improving the problem that the electrical connection between the first electrode 700 and the first power signal line 200 is affected due to the light-emitting material overflowing onto the conductive portion 310.

[0092] In some alternative embodiments, please refer to Figure 1 and Figure 3, the pixel defining part 410 includes a first sub - part 411 and a second sub - part 412 which are spaced apart from each other. The first opening 420 is formed in the first sub - part 411, and the second opening 430 is formed in the second sub - part 412. The dam part 600 is located on the side of the second sub - part 412 away from the substrate 100.

[0093] In these alternative embodiments, the pixel defining part 410 is divided into a first sub - part 411 and a second sub - part 412, and the first sub - part 411 and the second sub - part 412 are spaced apart from each other, and there will be a gap between the first sub - part 411 and the second sub - part 412. When the light - emitting material overflows from the first opening 420 of the first sub - part 411 to the second opening 430 of the second sub - part 412, at least part of the light - emitting material will overflow into the gap between the first sub - part 411 and the second sub - part 412. By accommodating the overflowing light - emitting material through this gap, the volume of the light - emitting material overflowing to the side of the dam part 600 away from the second opening 430 can be further reduced, and thus the problem of the electrical connection between the first electrode 700 and the first power signal line 200 affected by the overflow of the light - emitting material onto the conductive part 310 can be better improved.

[0094] There are various ways to set the shapes of the first sub - part 411 and the second sub - part 412. For example, as Figure 3 and Figure 4 shown, the first sub - part 411 is in a ring shape, and the first opening 420 is located inside the ring - shaped first sub - part 411. And / or, the second sub - part 412 is in a ring shape, and the second opening 430 is located inside the ring - shaped second sub - part 412. Multiple first sub - parts 411 and multiple second sub - parts 412 are distributed at intervals on the substrate 100.

[0095] Optionally, the dam part 600 has a first surface 610 facing away from the substrate 100, and the first sub - part 411 has a second surface 401 facing away from the substrate 100. The first surface 610 is located on the side of the second surface 401 away from the substrate 100.

[0096] In these alternative embodiments, the dam part 600 protrudes relative to the first sub - part 411 in a direction away from the substrate 100, that is, the first surface 610 protrudes relative to the second surface 401, and the height of the dam part 600 relative to the substrate 100 is greater than the height of the first sub - part 411 relative to the substrate 100. When the light - emitting material is arranged in the first opening 420, due to the blocking of the dam part 600, the light - emitting material is difficult to fall on the first surface 610 of the dam part 600, and thus it is difficult to overflow to the second opening 430, further improving the hydrophobic effect of the dam part 600 and improving the connection yield between the first electrode 700 and the conductive part 310.

[0097] In some other alternative embodiments, as Figure 5As shown, the orthographic projection of the dam portion 600 on the substrate 100 is located within the second opening 430 , and the dam portion 600 is in direct contact with the substrate 100 through the second opening 430 .

[0098] In these optional embodiments, the dam portion 600 falls into the second opening 430 , the dam portion 600 is arranged around the conductive portion 310 in the second opening 430 , and there is no pixel defining portion 410 between the dam portion 600 and the substrate 100 , which can simplify the preparation method of the dam portion 600 .

[0099] Optionally, the opening size of the second opening 430 is larger than the size of the conductive part 310 exposed thereby, that is, the orthographic projection of the conductive part 310 on the substrate 100 is located within the orthographic projection of the second opening 430 on the substrate 100 to ensure that a sufficiently large area of ​​the conductive part 310 can be exposed.

[0100] Optionally, the dam portion 600 surrounds the conductive portion 310 exposed from the second opening 430. The dam portion 600 and the conductive portion 310 may be spaced apart, that is, the conductive portion 310 is located in the area enclosed by the dam portion 600, and the conductive portion 310 and the dam portion 600 are spaced apart. Alternatively, the dam portion 600 and the conductive portion 310 are adjacent, the dam portion 600 surrounds the conductive portion 310 and is connected to the edge of the conductive portion 310. Alternatively, part of the dam portion 600 overlaps the conductive portion 310.

[0101] Optionally, the pixel defining portion is arranged to be spaced apart from an inner wall surface facing the second opening and the dam portion.

[0102] In these optional embodiments, there is a gap between the inner wall surface of the pixel defining portion 410 facing the second opening 430 and the dam portion 600. When the light-emitting material overflows from the first opening 420 to the second opening 430, part of the light-emitting material can remain in the above gap, thereby reducing the light-emitting material overflowing to the upper surface of the dam portion 600, better improving the hydrophobic effect of the dam portion 600, and improving the connection yield between the first electrode 700 and the conductive portion 310.

[0103] Optionally, when the dam portion 600 is located in the second opening 430, when the dam portion 600 and the pixel defining portion 410 are both disposed on the substrate 100, the dam portion 600 and the pixel defining portion 410 may be at the same height, or, as shown in FIG. Figure 5 As shown, the height of the dam portion 600 is lower than the pixel defining portion 410, that is, the first surface 610 is located on the side of the second surface 401 facing the substrate 100; or Figure 6 As shown, the height of the dam portion 600 is higher than the height of the pixel defining portion 410 , that is, the first surface 610 is located on the side of the second surface 401 away from the substrate 100 , so as to achieve better hydrophobic performance.

[0104] In some alternative embodiments, such as Figure 1 and Figure 2 shown, the display panel 10 includes overlapping regions DA, and a plurality of overlapping regions DA are spaced apart and distributed, and the conductive portion 310 is located in the overlapping region DA.

[0105] In these alternative embodiments, the overlapping region DA is provided on the display panel 10, and the conductive portion 310 is disposed within the overlapping region DA. When preparing the light-emitting portion 510 by processes such as inkjet printing and coating, by controlling components such as the nozzles of the inkjet printing, the light-emitting material is not sprayed onto the substrate 100 within the overlapping region DA, thereby better improving the problem that the light-emitting material overflows onto the conductive portion 310.

[0106] Optionally, the dam portion 600 is located in the overlapping region DA to better improve the problem that the light-emitting material overflows onto the conductive portion 310 within the overlapping region DA.

[0107] Optionally, a plurality of conductive portions 310 are spaced apart and distributed along the extending direction of the overlapping region DA. By providing a plurality of conductive portions 310 within the same overlapping region DA, the first electrode 700 can be electrically connected to the first power signal line 200 through the plurality of conductive portions 310, further improving the connection yield between the first electrode 700 and the first power signal line 200. As Figure 1 described, when the overlapping region DA extends along the second direction Y, the conductive portions 310 can be spaced apart and distributed along the second direction Y.

[0108] Optionally, as Figure 7 shown, the orthographic projection of the conductive portion 310 on the substrate 100 is circular, so that the light-emitting material can spread around the conductive portion 310, better improving the problem that the light-emitting material easily overflows onto the conductive portion 310.

[0109] Optionally, as Figure 7 shown, the orthographic projection of the dam portion 600 on the substrate 100 is annular, so that the light-emitting material can spread on the outer peripheral side of the dam portion 600 and is difficult to overflow onto the conductive portion 310.

[0110] In other embodiments, such as Figure 8 and Figure 9 shown, the orthographic projection of the conductive portion 310 on the substrate 100 can also be polygonal, such as triangular, square, etc., and the shape of the dam portion 600 is adapted to the shape of the conductive portion 310, and the orthographic projection of the dam portion 600 on the substrate 100 is polygonal annular.

[0111] In some alternative embodiments, please continue to refer to Figure 1 , the overlapping region DA is strip-shaped, and a plurality of overlapping regions DA are arranged side by side along the first direction X and / or the second direction Y, and the first direction X and the second direction Y intersect. Figure 1The overlapping region DA is arranged to extend along the first direction X, and a plurality of overlapping regions DA are arranged side by side along the second direction Y. In other embodiments, the overlapping region may also extend along the second direction Y, and a plurality of overlapping regions DA are arranged side by side along the first direction X.

[0112] In these alternative embodiments, the overlapping region DA is strip-shaped. When preparing the light-emitting portion 510 by means of a coating process or the like, a long strip-shaped overlapping region DA can be formed by conveniently closing one or two adjacent nozzle components, facilitating the preparation and shaping of the display panel 10.

[0113] Optionally, the extension dimension of the overlapping region DA in the second direction Y is greater than its extension dimension in the first direction X, and a plurality of overlapping regions DA are arranged side by side along the first direction X. As described above, the overlapping region DA is strip-shaped, and a plurality of strip-shaped overlapping regions DA are arranged side by side along their first direction X. By closing one group or more than two groups of nozzles, a plurality of overlapping regions DA arranged side by side can be formed.

[0114] For example, the light-emitting portion 510 is prepared and shaped by a coating process. Materials for the light-emitting portion 510 are contained in a plurality of containers having nozzle components. The plurality of nozzle components are arranged side by side along the first direction X, and then the plurality of nozzle components are moved along the second direction Y, and while moving, the materials for the light-emitting portion 510 are sprayed onto the corresponding substrate. The first direction X and the second direction Y intersect, for example, the first direction X and the second direction Y are perpendicular, so as to achieve large-area coating of the materials for the light-emitting portion 510. During the spraying process, by closing one or more nozzles, the overlapping region DA where the materials for the light-emitting portion 510 are not provided is formed, and the preparation method is simple, convenient and easy to operate.

[0115] Optionally, the width of the overlapping region DA in the first direction X is 10 μm to 50 μm, and the length of the overlapping region DA in the second direction Y is greater than or equal to 10 μm. When the size of the overlapping region DA is within the above range, on the one hand, it is convenient to form the overlapping region DA by closing the nozzle, and on the other hand, it can also provide a relatively large setting area for the conductive portion 310, facilitating the mutual connection between the first electrode 700 and the conductive portion 310.

[0116] Optionally, the distance between two adjacent overlapping regions DA is greater than or equal to 5 μm. This can not only improve the situation that the distance between two adjacent overlapping regions is too small, which affects the setting of the light-emitting portion 510 and the light-emitting effect of the display panel 10, but also improve the situation that the distance between two adjacent overlapping regions DA is too large, which affects the electrical connection between the first electrode 700 and the conductive portion 310.

[0117] In some other alternative embodiments, as Figure 10 shown, the display panel 10 further includes a display area AA, and a plurality of overlapping regions DA are evenly distributed in the display area AA.

[0118] In these embodiments, the overlapping region DA is in the shape of dots and is evenly distributed in the display region AA, so that a plurality of conductive portions 310 can be evenly distributed in the display region AA, thereby improving the overlapping yield between the first electrode 700 and the conductive portions 310.

[0119] In these alternative embodiments, the light-emitting material can be printed onto the substrate 100 by a pixel-level printing device to form the light-emitting portion 510.

[0120] Optionally, the shape of the overlapping region DA can be square, which is convenient for the preparation and molding of the overlapping region. Optionally, the distance between two adjacent overlapping regions DA is less than or equal to 50 μm, so that the light-emitting material can be printed by a pixel-level printing device. Alternatively, the distance between two adjacent overlapping regions DA is greater than or equal to 80 μm, so that the light-emitting material can be printed by a non-pixel-level printing device.

[0121] For example, when preparing the light-emitting portion 510, the light-emitting material can be printed onto a preset substrate by a pixel-level printing device, and the position of the overlapping region DA is avoided during printing to form the overlapping region DA where the light-emitting material is not coated.

[0122] There are various ways to set the shape of the dam portion 600. In the direction away from the substrate 100, the cross-section of the dam portion 600 can be set to have a constant cross-section.

[0123] Or, in other embodiments, as Figure 2 and Figure 11 shown, the dam portion 600 has a bottom surface 620 facing the substrate 100, a top surface (i.e., the first surface 610) facing away from the substrate 100, and a side surface 630 connecting the top surface and the bottom surface 620, that is, the side surface 630 is connected to the bottom surface 620 and extends away from the substrate 100, and the included angle b between the side surface 630 and the bottom surface 620 is greater than or equal to 10° and less than or equal to 70 degrees.

[0124] In these alternative embodiments, the included angle b between the side surface 630 and the bottom surface 620 is between 10 degrees and 70 degrees, which can not only reduce the distribution area of the dam portion 600, but also improve the problem that an excessive included angle affects the continuity of the first electrode 700 and the first electrode 700 is prone to breakage on the periphery of the dam portion 600.

[0125] In some alternative embodiments, the thickness d of the dam portion 600 1 and the thickness d of the light-emitting portion 510 2 satisfy: d 1 ≥15d 2 .

[0126] In these alternative embodiments, when d 1 and d 2When the above relationship is satisfied, the thickness d of the dam portion 600 can be improved 1 If it is too small, it will affect the blocking effect of the dam portion 600 on the light-emitting material, and the hydrophobic effect can be further improved.

[0127] Optionally, the thickness d of the dam portion 600 1 is 200 nm to 10 μm. When the thickness of the dam portion 600 is within the above numerical range, it can not only improve the thickness d of the dam portion 600 1 If it is too small, it will affect the blocking effect of the dam portion 600 on the light-emitting material; it can also improve the situation where the thickness d of the dam portion 600 is too large 1 which affects the continuity of the first electrode 700 and improves the problem that the first electrode 700 is prone to breakage on the peripheral side of the dam portion 600.

[0128] Optionally, the width of the dam portion 600 is 2 μm to 10 μm. When the width of the dam portion 600 is within the above range, it can not only improve the situation where the width of the dam portion 600 is too small and affects the hydrophobic effect, but also improve the situation where the width of the dam portion 600 is too large and affects the distribution area of the light-emitting portion 510, affecting the display effect of the display panel 10.

[0129] There are various ways to arrange the conductive portion 310. In some optional embodiments, such as Figure 12 and Figure 13 as shown, a groove 311 is provided on the surface of the conductive portion 310 facing the first electrode 700.

[0130] In these optional embodiments, when the dam portion 600 does not completely block the light-emitting material and part of the light-emitting material overflows from the dam portion 600 to the conductive portion 310, the light-emitting material easily flows in the groove 311 provided near the dam portion 600. Through the groove 311, part of the light-emitting material can be blocked from continuing to flow toward the central region of the conductive portion 310, so that the first electrode 700 can be connected to the conductive portion 310 through the central region of the conductive portion 310, improving the connection yield between the first electrode 700 and the conductive portion 310. In addition, when the light-emitting material is limited in the groove 311, the protrusions 312 on both sides of the groove 311 can be exposed from the groove 311, and the protrusions 312 are not easily covered by the light-emitting material, thereby improving the connection yield between the first electrode 700 and the conductive portion 310.

[0131] There are various ways to arrange the groove 311. For example, a plurality of grooves 311 are provided on the surface of the dam portion 600, which can improve the hydrophobic effect on the surface of the conductive portion 310.

[0132] Optionally, as Figure 14 shown, the groove 311 is formed by extending along the first direction X, and a plurality of grooves 311 are arranged side by side along the second direction Y. By providing a plurality of grooves 311 arranged side by side, the hydrophobic effect can be further improved.

[0133] Optionally, the surface of the conductive portion 310 facing away from the substrate 100 has protrusions 312, and grooves 311 are formed between two adjacent protrusions 312. In some alternative embodiments, the display panel 10 further includes a second electrode layer 800, which is located on the side of the pixel definition layer 400 facing the substrate 100, and the second electrode layer 800 includes second electrodes 810 corresponding to the respective first openings 420.

[0134] In these alternative embodiments, the second electrode 810 and the first electrode 700 interact to drive the light-emitting portion 510 to emit light. One of the first electrode 700 and the second electrode 810 is an anode, and the other is a cathode. In the embodiments of the present application, it is exemplified that the first electrode 700 is a cathode and the second electrode 810 is an anode.

[0135] When the display panel 10 includes the second electrode 810, as Figure 3 shown, the conductive portion 310 and the second electrode 810 can be provided on the same layer, so that the conductive portion 310 and the second electrode 810 can be formed in the same process step, which can simplify the manufacturing process of the display panel 10. At this time, the conductive portion 310 and the first power signal line 200 can be connected through vias.

[0136] In other embodiments, as Figure 15 shown, a planarization layer 900 is further provided on the substrate 100. The planarization layer 900 is located on the side of the second electrode layer 800 facing away from the pixel definition layer 400, the conductive layer 300 is located on the side of the planarization layer 900 facing away from the second electrode layer 800, and a communication hole 910 is formed in the planarization layer 900. The first electrode 700 is connected to the conductive portion 310 through the communication hole 910.

[0137] In these alternative embodiments, the conductive portion 310 and the second electrode 810 are provided on different layers. The conductive portion 310 is located on the side of the second electrode 810 facing the substrate 100. A communication hole 910 is formed in the planarization layer 900, and the communication hole 910 communicates with the second opening 430. The first electrode 700 is first cured and connected to the conductive portion 310 through the communication hole 910. At this time, the conductive portion 310 and the first power signal line 200 can be connected through vias. For example, the conductive portion 310 and the first power signal line 200 are located in different film layer structures. Further, the first power signal line 200 can be located in the film layer structure on the side of the conductive layer 300 facing the substrate 100, so that the conductive portion 310 and the first power signal line 200 can be connected through vias. Or, the conductive portion 310 and the first power signal line 200 are located in adjacent film layer structures, and the conductive portion 310 and the first power signal line 200 are directly in contact connection to improve the connection yield between the conductive portion 310 and the first power signal line 200.

[0138] There are various ways to arrange the light-emitting part 510. Optionally, for example Figure 16 As shown, the light-emitting part 510 includes a hole injection layer 511, a hole transport layer 512, and a light-emitting material layer 513 that are stacked. The light-emitting material layer 513 can be a quantum dot material. Then, one of the hole injection layer 511 and the hole transport layer 512 can use processes such as inkjet printing and coating to set the relevant ink on the substrate 100. In the display panel 10 provided in the embodiments of the present application, due to the presence of the dam part 600, when preparing the hole injection layer 511 and / or the hole transport layer 512, it is possible to improve the ink from overflowing onto the hydrophobic overlapping part and affecting the electrical connection between the first electrode 700 and the first power signal line 200. Optionally, the light-emitting part 510 further includes an electron transport layer 514, and the electron transport layer 514 is disposed between the first electrode 700 and the light-emitting material layer 513.

[0139] An embodiment of the second aspect of the present application further provides a display device, including the display panel 10 of any of the above first aspect embodiments. Since the display device provided in the embodiments of the second aspect of the present application includes the display panel 10 of any of the above first aspect embodiments, the display device provided in the embodiments of the second aspect of the present application has the beneficial effects of the display panel 10 of any of the above first aspect embodiments, which will not be elaborated here.

[0140] The display device in the embodiments of the present application includes, but is not limited to, devices with a display function such as mobile phones, personal digital assistants (Personal Digital Assistant, abbreviated as: PDA), tablet computers, e-books, televisions, access control systems, smart landline telephones, and consoles.

[0141] An embodiment of the third aspect of the present application further provides a method for manufacturing a display panel 10. The display panel 10 can be the display panel 10 of any of the above first aspect embodiments. Please refer to Figures 1 to 17 simultaneously, and the method for manufacturing the display panel 10 includes:

[0142] Step S01: As Figure 18 shown, a conductive material layer is provided on the substrate 100, and the conductive material layer is patterned to form the first power signal line 200.

[0143] Step S02: As Figure 19 shown, a conductive material layer is further provided on the substrate 100 with the first power signal line 200, and the conductive material layer is patterned to form a conductive layer 300. The conductive layer 300 includes a plurality of conductive parts 310 located on the side of the first power signal line 200 away from the substrate 100.

[0144] Optionally, when the conductive portion 310 and the first power supply signal line 200 are located in adjacent film layer structures and are directly in contact and connected, a conductive material layer may be directly formed on the substrate 100 with the first power supply signal line 200, and the conductive material layer may be patterned to form the conductive layer 300.

[0145] Optionally, when the conductive portion 310 and the first power supply signal line 200 are located in different film layer structures and are connected through vias, an insulating material layer is further formed on the substrate 100 with the first power supply signal line 200 before step S02, and the insulating material is patterned to form vias. In step S02, a conductive material layer is further formed on the insulating material layer, and the conductive material layer is patterned to form the conductive layer 300.

[0146] Step S03: As Figure 20 shown, a pixel defining material layer is formed on the substrate 100, and the pixel defining material layer is patterned to form a first opening 420 and a second opening 430, and at least a part of the conductive portion 310 is exposed through the second opening 430.

[0147] Step S04: As Figure 21 shown, a hydrophobic material layer is formed on the substrate 100, and the hydrophobic material layer is patterned to obtain a dam portion 600 disposed around the conductive portion 310.

[0148] Optionally, as above, the dam portion 600 may be located on the pixel defining portion 410, or the dam portion 600 may be located on the substrate 100 exposed through the second opening 430.

[0149] Step S05: As Figure 22 shown, an emission layer 500 is further formed on the substrate 100, and the emission layer 500 includes a plurality of emission portions 510, and at least a part of the emission portions 510 are located in the first opening 420.

[0150] Step S06: As Figure 6 shown, a first electrode 700 is further formed on the substrate 100, and the first electrode 700 is connected to the conductive portion 310 through the second opening 430.

[0151] In the display panel 10 formed by the method provided in the embodiments of the present application, the light-emitting portion 510 of the light-emitting layer 500 is disposed in the first opening 420 formed in the pixel defining portion 410. The pixel defining portion 410 can improve the problem of color crosstalk between different light-emitting portions 510. A second opening 430 is further disposed on the pixel defining portion 410. At least a part of the orthographic projection of the second opening 430 on the substrate 100 overlaps with the orthographic projection of the conductive portion 310 on the substrate 100, so that the conductive portion 310 can be exposed by the second opening 430, and the first electrode 700 and the conductive portion 310 can be connected to each other via the second opening 430. The conductive portion 310 of the conductive layer 300 is connected to the first power signal line 200. Therefore, the first electrode 700 can be connected to the first power signal line 200 through the conductive portion 310, which can improve the problem of excessive voltage drop of the first electrode 700 and improve the display effect of the display panel 10. In addition, a dam portion 600 is further disposed on the substrate 100. The dam portion 600 is disposed around the conductive portion 310. When preparing the light-emitting portion 510, the blocking effect of the dam portion 600 can improve the problem that the material of the light-emitting portion 510 overflows onto the conductive portion 310 and affects the electrical connection between the first electrode 700 and the conductive portion 310, can improve the connection yield between the first electrode 700 and the conductive portion 310, better improve the voltage drop problem of the first electrode 700, and improve the display effect of the display panel 10. Therefore, the embodiments of the present application can improve the display performance of the display panel 10 by providing the dam portion 600.

[0152] Optionally, as described above, the display panel 10 includes a overlapping region DA. Optionally, the light-emitting portion 510 may include a communication opening located in the overlapping region DA. The conductive portion 310 is disposed in the overlapping region DA. The extension dimension of the overlapping region DA in the first direction X is greater than its extension dimension in the second direction Y. Then, in step S05, a plurality of nozzles arranged side by side may be moved along the first direction X to coat a light-emitting material on the substrate 100, and one or more adjacent nozzles may be closed for a preset period of time to form the light-emitting portion 510 including the communication opening in the overlapping region DA.

[0153] In these optional embodiments, when coating the light-emitting material on the substrate 100 by using inkjet printing, for example, when spraying the light-emitting material onto the substrate 100 by using a row of nozzles arranged along the second direction Y, this row of nozzles moves along the first direction X, and the light-emitting material can be coated on the entire surface of the substrate 100. By closing one or two adjacent nozzles in a row, the strip-shaped overlapping region DA on the substrate 100 can be prevented from being directly sprayed with the light-emitting material, and further, the influence of the conductive portion 310 being covered by the light-emitting material on its connection with the first electrode 700 can be improved.

[0154] In some other embodiments, in step S05, a light-emitting material may also be printed on the substrate 100 by using a pixel-level or non-pixel-level printing technique.

[0155] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A display panel, characterized in that, comprising: a substrate; a first power signal line disposed on the substrate; a conductive layer disposed on the first power signal line and including a plurality of conductive portions, the conductive portions being interconnected with the first power signal line; a pixel definition layer including a pixel defining portion and a first opening and a second opening formed in the pixel defining portion, at least a part of the orthographic projection of the second opening on the substrate overlapping with the orthographic projection of the conductive portion on the substrate; a light-emitting layer disposed on the side of the substrate where the conductive layer is located, the light-emitting layer including a plurality of light-emitting portions, at least some of the light-emitting portions being located within the first opening; a dam portion disposed on the substrate and surrounding the conductive portion, the material of the dam portion being immiscible with the material of the light-emitting portion; a first electrode disposed on the side of the light-emitting layer and the dam portion facing away from the substrate and interconnected with the conductive portion via the second opening.

2. The display panel according to claim 1, characterized in that, the dam portion is located on the side of the pixel defining portion facing away from the substrate and surrounds the second opening.

3. The display panel according to claim 2, characterized in that, the pixel defining portion includes a first sub-portion and a second sub-portion disposed at intervals, the first opening is formed in the first sub-portion, the second opening is formed in the second sub-portion, and the dam portion is located on the side of the second sub-portion facing away from the substrate; preferably, the dam portion has a first surface facing away from the substrate, the first sub-portion has a second surface facing away from the substrate, and the first surface is located on the side of the second surface facing away from the substrate.

4. The display panel according to claim 1, characterized in that, the orthographic projection of the dam portion on the substrate is located within the second opening, and the dam portion is in direct contact with the substrate through the second opening; preferably, the inner wall surface of the pixel defining portion facing the second opening and the dam portion are spaced apart.

5. The display panel according to claim 1, characterized in that, the display panel includes a lapping region, a plurality of the lapping regions are distributed at intervals, and the conductive portion is located in the lapping region; preferably, the dam portion is located in the lapping region; preferably, a plurality of the conductive portions are distributed at intervals along the extending direction of the lapping region; preferably, the orthographic projection of the conductive portion on the substrate is circular; preferably, the orthographic projection of the dam portion on the substrate is annular.

6. The display panel according to claim 5, characterized in that, the lapping region is strip-shaped, a plurality of the lapping regions are arranged side by side along a first direction and / or a second direction, and the first direction and the second direction intersect; preferably, the extending dimension of the lapping region in the second direction is greater than its extending dimension in the first direction, and a plurality of the lapping regions are arranged side by side along the first direction; preferably, the width of the lapping region in the first direction is 10 μm to 50 μm, and the length of the lapping region in the second direction is greater than or equal to 10 μm; Preferably, the distance between two adjacent overlapping areas is greater than or equal to 5 μm.

7. The display panel according to claim 5, It is characterized in that The display panel further comprises a display area, and the plurality of overlapping areas are evenly distributed in the display area; Preferably, the overlapping area is square; Preferably, the distance between two adjacent overlapping regions is less than or equal to 50 μm, or the distance between two adjacent overlapping regions is greater than or equal to 80 μm.

8. The display panel according to claim 1, It is characterized in that The dam portion has a side surface connected to the bottom surface facing the bottom surface of the substrate and extending away from the substrate, and an angle between the side surface and the bottom surface is greater than or equal to 10 degrees and less than or equal to 70 degrees.

9. The display panel according to claim 1, It is characterized in that The thickness d of the dam portion 1 and the thickness d of the light-emitting portion 2 satisfy: d 1 ≥ 15d 2 ; And / or, the thickness d of the dam part 1 is 200 nm to 10 μm; And / or, the width of the bank portion is 2 μm to 10 μm.

10. The display panel according to claim 1, It is characterized in that A groove is provided on the surface of the conductive portion facing the first electrode; Preferably, a plurality of the grooves are arranged at intervals; Preferably, the groove is extended and formed along a first direction, and a plurality of the grooves are arranged side by side along a second direction.

11. The display panel according to claim 1, It is characterized in that Also includes: A second electrode layer is located on a side of the pixel definition layer facing the substrate, and the second electrode layer includes second electrodes arranged corresponding to each of the first openings. The conductive part and the second electrode are arranged in the same layer; or a planarization layer is further arranged on the substrate, the planarization layer is located on the side of the second electrode layer away from the pixel definition layer, the conductive layer is located on the side of the planarization layer away from the second electrode layer, a connecting hole is opened on the planarization layer, and the first electrode and the conductive part are connected to each other via the connecting hole; Preferably, the conductive portion is in contact with the first power signal line; or the conductive layer is in via-connection with the first power signal line.

12. The display panel according to claim 1, It is characterized in that The surface of the dam portion facing away from the substrate is a hydrophobic and / or oleophobic low-energy surface.

13. A display device, It is characterized in that A display panel comprising any one of claims 1 to 12.

14. A method for preparing a display panel, It is characterized in that include: A conductive material layer is provided on the substrate, and the conductive material layer is patterned to form a first power signal line; A conductive material layer is further provided on the substrate with the first power signal line, and the conductive material layer is patterned to form a conductive layer, wherein the conductive layer includes a plurality of conductive portions located on a side of the first power signal line away from the substrate; Disposing a pixel definition material layer on the substrate, and patterning the pixel definition material layer to form a first opening and a second opening, wherein at least a portion of the conductive portion is exposed through the second opening; Disposing a hydrophobic material layer on the substrate, and patterning the hydrophobic material layer to obtain a dam portion disposed around the conductive portion; Continue to form a light-emitting layer on the substrate, the light-emitting layer including a plurality of light-emitting portions, and at least a part of the light-emitting portions being located in the first opening; Continue to form a first electrode on the substrate, the first electrode being connected to the conductive portion through the second opening.

15. The method according to claim 14, wherein, the display panel includes an overlapping region, the light-emitting portion includes a communication opening located in the overlapping region, the conductive portion is disposed in the overlapping region, the overlapping region has an extension dimension in a first direction greater than its extension dimension in a second direction, and in the step of continuing to form the light-emitting layer on the substrate: move a plurality of nozzles arranged side by side along the first direction to coat a light-emitting material on the substrate, and close one or more adjacent nozzles for a preset period of time to form a light-emitting portion including the communication opening in the overlapping region.

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