Display panel and display apparatus

Abstract

A display panel, comprising: a substrate, a planarization layer disposed on the substrate, a plurality of first electrodes distributed in an array, and a plurality of light-emitting functional layers. The planarization layer comprises a planarization body portion and a plurality of protrusion portions located on the planarization body portion and arranged in a first direction, each protrusion portion extending in a second direction. In the first direction, each first electrode is located between two adjacent protrusion portions, and there is a gap between the first electrode and at least one adjacent protrusion portion. The light-emitting functional layers each cover a first electrode and partially fill a gap.

Description

Display panel and display device

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application No. 202411531001.9, filed on October 30, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of display technology, specifically to a display panel and display device. Background Technology

[0004] Organic light-emitting diode (OLED) display panels are characterized by self-illumination, fast response, wide viewing angle, and high brightness, and are therefore widely used in display devices.

[0005] In related technologies, OLED display panels include an array substrate and light-emitting devices. The light-emitting devices include a first electrode, a light-emitting functional layer, and a second electrode stacked on the array substrate. However, the ink used to form the light-emitting functional layer is prone to significant creepage, which affects the display performance of the OLED display panel. Invention Overview

[0006] This application provides a display panel and display device, which aims to solve the problem of significant ink creep phenomenon in related technologies.

[0007] On one hand, embodiments of this application provide a display panel, which includes: a substrate, a planarization layer disposed on the substrate, a plurality of first electrodes arranged in an array, and a plurality of light-emitting functional layers. The planarization layer includes a flat main portion and a plurality of protrusions located on the side of the flat main portion away from the substrate. Each of the protrusions extends along a second direction, and the plurality of protrusions are arranged side by side along a first direction. The plurality of first electrodes are located on the flat main portion. In the first direction, each first electrode is located between two adjacent protrusions, and there is a gap between the first electrode and at least one adjacent protrusion. The light-emitting functional layers cover the first electrodes and partially fill the gaps.

[0008] On the other hand, embodiments of this application provide a display device including a display panel. The display panel includes: a substrate, a planarization layer disposed on the substrate, a plurality of first electrodes arranged in an array, and a plurality of light-emitting functional layers. The planarization layer includes a flat main portion and a plurality of protrusions located on the side of the flat main portion away from the substrate. Each of the protrusions extends along a second direction, and the plurality of protrusions are arranged side by side along a first direction. The plurality of first electrodes are located on the flat main portion. In the first direction, each first electrode is located between two adjacent protrusions, and there is a gap between the first electrode and at least one adjacent protrusion. The light-emitting functional layers cover the first electrodes and partially fill the gaps. Beneficial effects

[0009] In the display panel provided in this application embodiment, by providing a gap between the first electrode and at least one adjacent protrusion, the ink used to form the light-emitting functional layer fills the gap between the first electrode and the protrusion during the fabrication of the light-emitting functional layer. This allows some of the ink that would normally climb along the protrusion to remain in the gap, effectively mitigating ink climbing and thus improving the display effect of the display panel. Furthermore, since some ink remains in the gap between the first electrode and the protrusion, the ink climbing height is reduced. This effectively prevents ink from overflowing into the pit between two adjacent protrusions and causing color mixing with other light-emitting devices. It also helps to make the surface of the light-emitting functional layer away from the substrate flatter, thereby increasing the effective light-emitting area of ​​the light-emitting functional layer and improving the aperture ratio of the display panel. In addition, since some ink remains in the gap between the first electrode and the protrusion, the edge of the first electrode can also be effectively covered, thus preventing a short circuit between the first electrode and the second electrode located on the light-emitting functional layer. Attached Figure Description

[0010] Figure 1 is a cross-sectional view of an OLED display panel in the related technology;

[0011] Figure 2 is a schematic diagram of the structure of a display panel provided in some embodiments of this application;

[0012] Figure 3 is a cross-sectional view of the display panel in Figure 2 along the A-A' direction after the light-emitting functional layer is set;

[0013] Figure 4 is another cross-sectional view of the display panel in Figure 2 along the A-A' direction after the light-emitting functional layer is set;

[0014] Figure 5 is a cross-sectional view of the display panel in Figure 2 along the B-B' direction after the light-emitting functional layer is set;

[0015] Figure 6 is a schematic diagram of the structure of a display panel provided in some other embodiments of this application;

[0016] Figure 7 is a schematic diagram of the structure of a display panel provided in some embodiments of this application;

[0017] Figure 8 is a cross-sectional view of the display panel in Figure 7 along the C-C' direction after the light-emitting functional layer is set;

[0018] Figure 9 is a schematic diagram of the structure of a display device provided in some embodiments of this application. Embodiments of the present invention

[0019] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. The described technical solutions are for illustrative purposes only and should not be construed as limiting the scope of protection of this application.

[0020] In the description of this application, it should be understood that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different technical features. The terms "multiple" and similar words mean two or more, unless otherwise expressly defined.

[0021] The use of “configured to” in this application implies open and inclusive language, which does not preclude the applicability to or configuration of devices to perform additional tasks or steps. Furthermore, the use of “based on” implies openness and inclusivity, because processes, steps, calculations, or other actions “based on” one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0022] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application.

[0023] The various embodiments of this application are similar, and features from different embodiments and / or different examples can be combined with each other.

[0024] In related technologies, as shown in Figure 1, during the fabrication of an OLED display panel 100', a pixel definition layer 12' is typically fabricated on an array substrate where a first electrode 11' is formed. The pixel definition layer 12' has openings corresponding to light-emitting devices. Ink is then sprayed into these openings using an inkjet printing process. After drying, the ink forms a light-emitting functional layer 13'. However, during the drying process, the ink tends to climb along the sidewalls around the openings, forming a light-emitting functional layer 13' that is thick at the edges and thin in the middle. Furthermore, since the first electrode 11' is fabricated before the pixel definition layer 12', the pixel definition layer 12' covers the edges of the first electrode 11', making the ink climbing phenomenon (i.e., the ink climbing along the sidewalls around the openings) more pronounced, thus affecting the display effect of the OLED display panel.

[0025] Based on this, some embodiments of this application provide a display panel, as shown in Figures 2 to 8. The display panel includes a substrate 11, a planarization layer 13 located on the substrate 11, a plurality of first electrodes 21 arranged in an array on the planarization layer 13, and a plurality of light-emitting functional layers 23. The planarization layer 13 includes a planar main body portion 131 and a plurality of protrusions 132. Each protrusion 132 extends along a second direction Y, and the plurality of protrusions 132 are arranged side by side along a first direction X, wherein the first direction X and the second direction Y intersect each other. For example, the first direction X and the second direction Y can be perpendicular to each other.

[0026] In some examples, as shown in Figures 5 and 6, the display panel further includes a driving circuit layer located between the substrate 11 and the planarization layer 13. Two adjacent protrusions 132 and the planar body 131 together define a recess K, within which a plurality of spaced-apart vias H penetrating the planar body 131 are provided. For example, the recess K between two adjacent protrusions 132 extends along a second direction Y, and the plurality of vias H within the recess K are spaced apart along the second direction Y. A plurality of first electrodes 21 can correspond one-to-one with a plurality of vias H. In this case, the first electrodes 21 are connected to the driving circuit layer through the vias H.

[0027] For example, the flat body portion 131 and the plurality of protrusions 132 can be integrally formed, so that the first electrode 21 can be made after the flat layer 13 is made, thereby effectively avoiding the protrusions 132 being made after the first electrode 21 is made, which would cause them to cover the edge of the first electrode 21.

[0028] As shown in Figures 3 to 5, in the first direction X, the width of the protrusion 132 on the side away from the substrate 11 is smaller than the width of the protrusion 132 on the side closer to the substrate 11. In this case, the cross-section of the protrusion 132 is trapezoidal. This cross-section is parallel to both the first direction X and the third direction Z, where the third direction Z is the thickness direction of the substrate 11, and the third direction Z is perpendicular to both the first direction X and the second direction Y.

[0029] In some examples, the planarization layer 13 can be fabricated using a halftone mask, thereby simultaneously forming the protrusion 132 and the via H on the planarization layer 13.

[0030] As shown in Figures 3 to 6, the light-emitting functional layer 23 covers a corresponding first electrode 21. Each first electrode 21 and the light-emitting functional layer 23 together correspond to a light-emitting device, which also includes a second electrode, which is disposed on the side of the light-emitting functional layer 23 away from the first electrode 21. The driving circuit layer 12 can provide an anode signal to the first electrode 21, and the second electrode can receive a cathode signal. Under the combined action of the cathode signal received by the second electrode and the anode signal received by the first electrode 21, the light-emitting functional layer 23 can emit light, thereby realizing the display function of the display panel 100.

[0031] As shown in Figures 2 to 4, in the first direction X, each first electrode 21 is located between two adjacent protrusions 132, and there is a gap F between the first electrode 21 and at least one adjacent protrusion 132. The light-emitting functional layer 23 partially fills the gap F.

[0032] With this configuration, since there is a gap F between the first electrode 21 and at least one adjacent protrusion 132, the ink used to form the light-emitting functional layer 23 will fill the gap F between the first electrode 21 and the protrusion 132 during the fabrication of the light-emitting functional layer 23. This allows some of the ink that would normally climb along the protrusion 132 to remain in the gap F, effectively mitigating the ink climbing phenomenon and thus helping to improve the display effect of the display panel 100. Furthermore, since some ink remains in the gap F between the first electrode 21 and the protrusion 132, the ink climbing height is reduced. This effectively prevents ink from overflowing into the pit K and causing color mixing with other light-emitting devices. It also helps to make the surface of the light-emitting functional layer 23 away from the substrate 11 flatter, thereby increasing the effective light-emitting area of ​​the light-emitting functional layer 23 and improving the aperture ratio of the display panel 100. Furthermore, since some ink remains in the gap F between the first electrode 21 and the protrusion 132, the edge of the first electrode 21 can be effectively covered, thereby preventing a short circuit between the first electrode 21 and the second electrode located on the light-emitting functional layer 23.

[0033] In some embodiments, the size of the gap F in the first direction X is less than or equal to 1 μm.

[0034] The light-emitting area of ​​the light-emitting device is related to the area of ​​the first electrode 21 and the area of ​​the flat portion of the light-emitting functional layer 23. The presence of the gap F reduces the ink ramp height used to form the light-emitting functional layer 23, thereby increasing the area of ​​the flat portion (excluding the ramp portion) of the light-emitting functional layer 23. However, increasing the gap F leads to a decrease in the area of ​​the first electrode 21, which in turn reduces the light-emitting area of ​​the light-emitting device. By ensuring that the gap F is greater than 0 and less than or equal to 1 μm, the ink ramp height can be effectively reduced while maintaining a large light-emitting area, thus improving the aperture ratio of the display panel.

[0035] It is worth noting that, since the cross-section of the protrusion 132 is trapezoidal, the dimension of the gap F in the first direction X in this application refers to the distance between the bottom of the protrusion 132 and the bottom of the first electrode 21 in the first direction X.

[0036] In some embodiments, as shown in Figures 2 to 4, in the first direction X, the distance between two adjacent protrusions 132 is D2, the size of the first electrode 21 located between the two adjacent protrusions 132 is D1, and D2 is greater than D1, so that there is a gap F between the first electrode 21 and at least one adjacent protrusion 132.

[0037] Since the cross-section of the protrusion 132 is trapezoidal, the distance between two adjacent protrusions 132 in the first direction X can refer to the distance between the protrusions 132 on the side closer to the substrate 11 (i.e., the bottom of the protrusion 132).

[0038] In some embodiments, as shown in Figures 2 to 4, a gap F is provided between the first electrode 21 and the two adjacent protrusions 132.

[0039] As shown in Figures 3 and 4, the first electrode 21 located between two adjacent protrusions 132 has a first gap F1 between it and one of the protrusions 132, and a second gap F2 between it and the other protrusion 132. This allows the ink used to form the light-emitting functional layer 23 to partially fill the first gap F1 and the second gap F2, thereby effectively mitigating the ink creep phenomenon and helping to improve the display effect of the display panel 100. Furthermore, since some ink remains in the first gap F1 and the second gap F2, the height of the ink creep is also reduced, thereby effectively preventing ink from overflowing into the pit K and causing color mixing with other light-emitting devices.

[0040] In some examples, the dimension D3 of the first gap F1 in the first direction X is equal to the dimension D4 of the second gap F2 in the first direction X. In this case, the first electrode 21 is located in the middle of the two adjacent protrusions 132. After the light-emitting functional layer 23 is formed, the thickness of the light-emitting functional layer 23 at both ends in the first direction X is relatively consistent. This ensures the uniformity of the light-emitting functional layer 23, which helps to improve the light-emitting stability of the light-emitting device and thus improves the display effect of the display panel 100.

[0041] In other examples, the dimensions D3 of the first gap F1 in the first direction X and the dimensions D4 of the second gap F2 in the first direction X may not be equal.

[0042] In some embodiments, as shown in FIG4, the light-emitting functional layer 23 includes a hole injection layer 231 and a light-emitting layer 232 disposed sequentially along the direction away from the substrate 11. The hole injection layer 231 covers the first electrode 21 and partially fills the gap F, and the light-emitting layer 232 covers the hole injection layer 231.

[0043] The resistivity of the hole injection layer 231 is relatively small. Since there is a gap F between the first electrode 21 and the adjacent protrusion 132, the ink used to form the hole injection layer 231 will fill the gap F between the first electrode 21 and the protrusion 132 during the fabrication of the hole injection layer 231. This reduces the climbing height of the hole injection layer 231, which is beneficial for the light-emitting layer 232 to cover it. This avoids the light-emitting layer 232 from failing to effectively cover the hole injection layer 231, which would cause a leakage path to form between the first electrode 21 and the second electrode.

[0044] In some examples, the light-emitting functional layer 23 also includes a hole transport layer located between the hole injection layer 231 and the light-emitting layer 232, the hole transport layer covering the hole injection layer 231 and the light-emitting layer 232 covering the hole transport layer.

[0045] In some examples, the light-emitting functional layer 23 further includes at least one of an electron transport layer and an electron injection layer located between the light-emitting layer 232 and the second electrode. When the light-emitting functional layer 23 includes an electron transport layer and an electron injection layer, the electron injection layer is located on the side of the electron transport layer closer to the second electrode.

[0046] In some examples, as shown in Figures 3, 5 and 6, the multiple light-emitting functional layers 23 may include a first light-emitting functional layer 2311, a second light-emitting functional layer 2312 and a third light-emitting functional layer 2313. The first light-emitting functional layer 2311, the second light-emitting functional layer 2312 and the third light-emitting functional layer 2313 are used to emit red light, green light and blue light respectively, so as to realize the color display of the display panel 100.

[0047] In some embodiments, the surface of the protrusion 132 is hydrophobic. For example, the surface of the protrusion 132 is provided with a hydrophobic material. This further avoids the problem of color mixing between the light-emitting devices on both sides of the protrusion 132.

[0048] In some examples, the surface of the protrusion 132 has fluorine. The accumulation of fluorine can make the protrusion 132 have good hydrophobicity, thereby avoiding the increase in thickness and process cost caused by adding a hydrophobic material layer.

[0049] During the fabrication of planarization layer 13, an initial planarization layer can be formed on the driving circuit layer, and a material containing fluorine can be formed on the surface of the initial planarization layer away from the driving circuit layer. Then, a pre-bake process is used to accumulate fluorine on the surface of the initial planarization layer away from the driving circuit layer. Subsequently, a halftone mask process is used to form the protrusion 132 and the via H. The surface of the protrusion 132 away from the driving circuit layer is hydrophobic due to the accumulation of fluorine.

[0050] In some embodiments, as shown in Figures 2, 5, and 6, the first electrode 21 includes a main body 211 and a connecting portion 212 located on one side of the main body 211. The main body 211 is disposed on a planarization layer 13 (e.g., a planar main body 131), and the connecting portion 212 is partially located within a via H and electrically connected to the drive circuit layer. The main body 211 can achieve electrical connection with the drive circuit layer through the connecting portion 212, which partially fills the via H, thereby enabling the introduction of the first electrode signal.

[0051] The display panel 100 also includes a plurality of flat portions 22 corresponding to a plurality of first electrodes 21, the flat portions 22 at least covering the connection portions 212 of the corresponding first electrodes 21.

[0052] Since the flat portion 22 covers the connecting portion 212, the via H can be effectively flattened, thereby avoiding the need for excessive ink consumption (the ink is used to form the light-emitting functional layer 23) due to the depression at the location of the via H, thus saving ink usage.

[0053] In some examples, as shown in FIG2, the flat portion 22 covers the connecting portion 212 of the corresponding first electrode 21 and the edge of the main body portion 211 of the adjacent first electrode 21 near the connecting portion 212, wherein the adjacent first electrode 21 is located on the side of the connecting portion 212 of the first electrode 21 corresponding to the flat portion 22 away from the main body portion 211.

[0054] For example, two adjacent first electrodes 21 in the second direction Y are a first selected electrode 2111 and a second selected electrode 2112, respectively. The flat portion 22 corresponding to the first selected electrode 2111 covers the connecting portion 212 of the first selected electrode 2111 (for clarity, it is distinguished here by the first connecting portion) and the edge of the second selected electrode 2112 near the connecting portion 212 (i.e., the first connecting portion). The connecting portion 212 (i.e., the first connecting portion) is located on the side of the main body portion 211 of the first selected electrode 211 near the second selected electrode 2112.

[0055] It is worth noting that after the first electrode 21 is formed, a step is formed between the edge of the first electrode 21 and the underlying flat layer 13. The presence of the step causes the thickness of the light-emitting functional layer 23 to be relatively thin at the step position during the drying process of the ink to form the light-emitting functional layer 23. Consequently, after the second electrode is set, the second electrode is prone to contact with the first electrode 21 at the step position, resulting in a short circuit.

[0056] Therefore, through the above-described configuration, the flattening portion 22 can flatten the step formed between the first electrode 21 and the flattening layer 13, thereby ensuring the uniformity of the thickness of the light-emitting functional layer 23 at this location and avoiding the need to set more light-emitting functional layers 23 at this location, which would increase material costs. Furthermore, after the flattening portion 22 flattens the step formed between the first electrode 21 and the flattening layer 13, the flatness at this location is also beneficial for the subsequent setting of the second electrode. In addition, the flattening portion 22 can also cover the edge of the first electrode 21, thereby effectively isolating the first electrode 21 from the second electrode and thus avoiding the problem of short circuit between the first electrode 21 and the second electrode.

[0057] In some examples, as shown in Figure 2, the size of the main body 211 along the first direction X can be larger than the size of the connecting portion 212, thereby reducing the area of ​​the first electrode 21. In this case, the flat portion 22 can also cover the edge of the corresponding first electrode 21 on the side of the main body 211 facing the connecting portion 212, thus further ensuring that there is no short circuit between the first electrode 21 corresponding to the flat portion 22 and the subsequently fabricated second electrode.

[0058] In other examples, the size of the main body 211 along the first direction X may also be equal to the size of the connecting part 212, and this application does not limit it.

[0059] In some embodiments, a plurality of light-emitting functional layers 23 arranged along the second direction Y are interconnected. That is, a plurality of first electrodes 21 are provided in the recess K between two adjacent protrusions 132, and a plurality of light-emitting functional layers 23 located on the plurality of first electrodes 21 are connected in sequence.

[0060] With this configuration, when the ink used to form the light-emitting functional layer 23 enters the recess K by inkjet printing, the ink can only climb along the protrusions 132 on both sides of the recess K, and there will be no ink climbing phenomenon between two adjacent first electrodes 21. This can improve the uniformity of the thickness of the final light-emitting functional layer 23, thereby improving the display effect of the display panel 100.

[0061] The plurality of light-emitting functional layers 23 along the first direction X may include a first light-emitting functional layer 2311, a second light-emitting functional layer 2312 and a third light-emitting functional layer 2313, thereby enabling the display panel 100 to display color.

[0062] In some embodiments, as shown in FIG7 and FIG8, the planarization layer 13 further includes a plurality of limiting portions 133 located on the side of the planar main body portion 131 away from the substrate 11 and arranged in an array. Two adjacent limiting portions 133 along the second direction Y are connected to two protrusions 132 located on both sides of the limiting portion 133 and together define a light-emitting device region 130. The first electrode 21 and the light-emitting functional layer 23 are disposed in the light-emitting device region 130.

[0063] By setting up multiple limiting parts 133 and connecting each limiting part 133 to two adjacent protrusions 132, multiple light-emitting device areas 130 can be defined, and each light-emitting device area 130 can be used to set a corresponding light-emitting device. This increases the number of independently controllable light-emitting devices, thereby improving the resolution of the display panel 100.

[0064] In some embodiments, as shown in Figures 7 and 8, there is a gap between the first electrode 21 and at least one adjacent limiting portion 133. In this case, a gap can be formed between the first electrode 21 and at least one adjacent limiting portion 133, and the ink used to form the light-emitting functional layer 23 will fill the gap between the first electrode 21 and the limiting portion 133. This allows some of the ink that would normally climb along the limiting portion 133 to remain in the gap between the first electrode 21 and the limiting portion 133, thereby effectively alleviating the ink climbing phenomenon and helping to improve the display effect of the display panel 100. Furthermore, since some ink remains in the gap between the first electrode 21 and the limiting portion 133, the height of the ink climbing can also be reduced, thereby effectively preventing ink from overflowing the light-emitting device area 130 and causing color mixing to other light-emitting devices.

[0065] In some examples, there is a gap between the first electrode 21 and the two adjacent limiting portions 133. This can further and effectively alleviate the phenomenon of ink creep and prevent ink from overflowing into the light-emitting device area 130 and causing color mixing to other light-emitting devices, thereby improving the display effect of the display panel 100.

[0066] In some embodiments, as shown in Figures 7 and 8, all limiting portions 133 and protrusions 132 are integrally formed, so that the planarization layer 13 can be directly manufactured in one process, thereby improving the manufacturing efficiency of the planarization layer 13.

[0067] In some examples, the surface of the limiting portion 133 is hydrophobic. For example, the surface of the limiting portion 133 is provided with a hydrophobic material, which can further prevent color mixing between the light-emitting devices on both sides of the limiting portion 133.

[0068] For example, the surface of the limiting part 133 may contain fluorine.

[0069] In some embodiments, the driving circuit layer 12 includes a plurality of pixel driving circuits, each of which can be electrically connected to a first electrode 21, thereby enabling each pixel driving circuit to control the corresponding light-emitting device to emit light, thereby realizing the display function of the display panel 100.

[0070] In some examples, the pixel driving circuit can be directly electrically connected to the first electrode 21, or the pixel driving circuit can be electrically connected to the first electrode 21 through an adapter, and this application does not limit this.

[0071] In some embodiments, as shown in FIG5, the pixel driving circuit includes a plurality of thin-film transistors and at least one storage capacitor, wherein the thin-film transistors include an active layer, a gate, a source, and a drain disposed on a substrate 11. The film layer on which the active layer is located is a semiconductor layer 121; the film layer on which the gate is located is a gate metal layer 123; and the film layers on which the source and drain are located are source-drain metal layers 126.

[0072] A gate insulating layer 122 is provided between the semiconductor layer 121 and the gate metal layer 123; an interlayer insulating layer is provided between the gate metal layer 123 and the source / drain metal layer 126. For example, the interlayer insulating layer may include a first interlayer insulating layer 124 and a second interlayer insulating layer 125 disposed sequentially. In this case, a metal layer may be disposed between the first interlayer insulating layer 124 and the second interlayer insulating layer 125 to arrange an electrode of the storage capacitor or other circuit device. A passivation layer 127 may also be disposed on the side of the source / drain metal layer 126 away from the substrate 11.

[0073] One of the source and drain of the thin-film transistor is electrically connected to the first electrode 21 of the light-emitting device to transmit a first electrode signal to the first electrode 21, thereby driving the light-emitting device to emit light. The source or drain of the thin-film transistor can be directly or indirectly electrically connected to the first electrode 21 of the light-emitting device.

[0074] In some examples, a connection electrode layer 128 is also provided on the passivation layer 127. The connection electrode in the connection electrode layer 128 is electrically connected to the source or drain of the thin film transistor through a via on the passivation layer 127, and the connection electrode is also electrically connected to the first electrode 21 of the light-emitting device through a via H, thereby realizing the transmission of the first electrode signal.

[0075] In some examples, an insulating layer 129 is also provided on the side of the connection electrode layer 128 away from the substrate 11. The insulating layer 129 exposes the connection electrodes in the connection electrode layer 128 to achieve an electrical connection between the connection electrodes and the first electrode 21. Alternatively, the insulating layer 129 and the planarization layer 13 can be fabricated simultaneously.

[0076] It should be noted that the gate metal layer 123 can be located on the side of the semiconductor layer 121 away from or close to the substrate 11. When the gate metal layer 123 is located on the side of the semiconductor layer 121 away from the substrate 11, the gate of the thin-film transistor of the pixel driving circuit is located on the side of the active layer away from the substrate 11, and the thin-film transistor is a top-gate structure. When the gate metal layer 123 is located on the side of the semiconductor layer 121 close to the substrate 11, the gate of the thin-film transistor of the pixel driving circuit is located on the side of the active layer close to the substrate 11, and the thin-film transistor is a bottom-gate structure.

[0077] Some embodiments of this application provide a display device, as shown in FIG9, the display device 200 including the display panel 100 described in any of the above embodiments.

[0078] Since it includes a display panel 100, the display device 200 has all the technical effects of the display panel 100 described above, which will not be repeated here.

[0079] In some examples, the display device 200 also includes a frame 201 for securing the display panel 100.

[0080] In some examples, the display device 200 can be a watch, tablet computer, laptop computer, monitor, television, billboard, digital photo frame, printer with display function, telephone, mobile phone, personal digital assistant (PDA), digital camera, portable camcorder, viewfinder, navigator, home appliance, information query device (such as business query device for e-government, banks, hospitals, power companies, post offices, etc.), or any component with display function. This application does not impose any special limitations on the specific form of the above-described display device 200.

[0081] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A display panel, comprising: Substrate; A planarization layer is disposed on the substrate, the planarization layer including a planar main body portion and a plurality of protrusions located on the side of the planar main body portion away from the substrate, each of the protrusions extending along a second direction and the plurality of protrusions being arranged side by side along a first direction; A plurality of first electrodes are located on the flat main body and arranged in an array. In the first direction, each first electrode is located between two adjacent protrusions, and a gap exists between the first electrode and at least one adjacent protrusion. Multiple light-emitting functional layers, which cover the first electrode and partially fill the gap.

2. The display panel according to claim 1, wherein, The gap has a dimension of less than or equal to 1 μm in the first direction.

3. The display panel according to claim 1, wherein, The first electrode and the two adjacent protrusions each have the gap, and the gaps on both sides of the first electrode are equal.

4. The display panel according to claim 1, wherein, The light-emitting functional layer includes a hole injection layer and a light-emitting layer arranged sequentially along the direction away from the substrate. The hole injection layer covers the first electrode and partially fills the gap, and the light-emitting layer covers the hole injection layer.

5. The display panel according to claim 1, wherein, The surface of the protrusion is provided with a hydrophobic material.

6. The display panel according to any one of claims 1-5, wherein, The display panel further includes a driving circuit layer disposed on the substrate. A planarization layer is disposed on the driving circuit layer, and a via is provided on the planarization layer. The first electrode includes a main body portion and a connecting portion located on one side of the main body portion. The main body portion is disposed on the planarization layer, and the connecting portion is partially located within the via and electrically connected to the driving circuit layer. The display panel also includes a plurality of flat portions corresponding one-to-one with the plurality of first electrodes, the flat portions at least covering the connection portions of the corresponding first electrodes.

7. The display panel according to claim 6, wherein, The two adjacent first electrodes in the second direction are a first selected electrode and a second selected electrode, respectively. The flat portion corresponding to the first selected electrode covers the connecting portion of the first selected electrode and the edge of the second selected electrode near the connecting portion. The connecting portion is located on the side of the main body of the first selected electrode near the second selected electrode.

8. The display panel according to claim 6, wherein, The plurality of light-emitting functional layers arranged along the second direction are interconnected.

9. The display panel according to any one of claims 1-5, wherein, The planarization layer further includes a plurality of limiting portions located on the side of the planar main body away from the substrate and arranged in an array. Two adjacent limiting portions along the second direction are connected to two protrusions located on both sides of the limiting portions and together define a light-emitting device region. The first electrode and the light-emitting functional layer are both disposed within the light-emitting device region.

10. The display panel according to claim 9, wherein, The flat main body, the limiting part, and the protrusion are integrally formed, and the surface of the limiting part and the protrusion facing away from the substrate is provided with a hydrophobic material.

11. The display panel according to claim 9, wherein, There is a gap between the first electrode and at least one of the adjacent limiting portions.

12. A display device comprising a display panel, wherein, The display panel includes: Substrate; A planarization layer is disposed on the substrate, the planarization layer including a planar main body portion and a plurality of protrusions located on the side of the planar main body portion away from the substrate, each of the protrusions extending along a second direction and the plurality of protrusions being arranged side by side along a first direction; A plurality of first electrodes are located on the flat main body and arranged in an array. In the first direction, each first electrode is located between two adjacent protrusions, and a gap exists between the first electrode and at least one adjacent protrusion. Multiple light-emitting functional layers, which cover the first electrode and partially fill the gap.

13. The display device according to claim 12, wherein, The gap has a dimension of less than or equal to 1 μm in the first direction.

14. The display device according to claim 12, wherein, The first electrode and the two adjacent protrusions each have the gap, and the gaps on both sides of the first electrode are equal.

15. The display device according to claim 12, wherein, The light-emitting functional layer includes a hole injection layer and a light-emitting layer arranged sequentially along the direction away from the substrate. The hole injection layer covers the first electrode and partially fills the gap, and the light-emitting layer covers the hole injection layer.

16. The display device according to claim 12, wherein, The surface of the protrusion is provided with a hydrophobic material.

17. The display device according to any one of claims 12-16, wherein, The display panel further includes a driving circuit layer disposed on the substrate. A planarization layer is disposed on the driving circuit layer, and a via is provided on the planarization layer. The first electrode includes a main body portion and a connecting portion located on one side of the main body portion. The main body portion is disposed on the planarization layer, and the connecting portion is partially located within the via and electrically connected to the driving circuit layer. The display panel also includes a plurality of flat portions corresponding one-to-one with the plurality of first electrodes, the flat portions at least covering the connection portions of the corresponding first electrodes.

18. The display device according to claim 17, wherein, The two adjacent first electrodes in the second direction are a first selected electrode and a second selected electrode, respectively. The flat portion corresponding to the first selected electrode covers the connecting portion of the first selected electrode and the edge of the second selected electrode near the connecting portion. The connecting portion is located on the side of the main body of the first selected electrode near the second selected electrode.

19. The display device according to any one of claims 12-16, wherein, The planarization layer further includes a plurality of limiting portions located on the side of the planar main body away from the substrate and arranged in an array. Two adjacent limiting portions along the second direction are connected to two protrusions located on both sides of the limiting portions and together define a light-emitting device region. The first electrode and the light-emitting functional layer are both disposed within the light-emitting device region.

20. The display device according to claim 19, wherein, The flat main body, the limiting part, and the protrusion are integrally formed, and the surface of the limiting part and the protrusion facing away from the substrate is provided with a hydrophobic material.

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