Display panel and display device

Abstract

The present application belongs to the technical field of display. Disclosed are a display panel and a display device. The display panel comprises a driving backplane, first electrodes, a pixel definition layer, an organic light-emitting layer, and a second electrode layer. The pixel definition layer may have a plurality of pixel openings and partition grooves, and both the pixel openings and the partition grooves can penetrate a second definition layer and a first definition layer of the pixel definition layer in sequence. For any pixel opening, the side of the second definition layer surrounding the pixel opening that faces the driving backplane is flush with same, which can ensure that the partition effect of the partition grooves distributed on one side of any pixel opening on the organic light emitting layer is the same as the partition effect of the partition grooves on the other side of the pixel opening on the organic light emitting layer. That is, the partition grooves distributed around any one of the pixel openings have the same partition effect on a lateral leakage current generated in the organic light-emitting layer, thereby ensuring a better display effect of the display panel.

Description

Display panel and display device

[0001] This application claims priority to Chinese Patent Application No. 202411516824.4, filed on October 28, 2024, entitled “Display Panel and Display Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of display technology, and in particular to a display panel and display device. Background Technology

[0003] With the development of display technology, display devices are being used more and more widely. Among them, organic light-emitting diode (OLED) display panels have received increasing attention.

[0004] OLED display panels typically include a driver backplane and multiple light-emitting devices (LEDs) located on the driver backplane. The light-emitting layers in each LED are uniformly deposited using a vapor deposition process, meaning the light-emitting layers in each LED are interconnected. To prevent lateral leakage current generated in the light-emitting layer of one LED from causing adjacent LEDs to emit light during illumination, isolation slots are placed within the pixel definition layers distributed between adjacent LEDs to isolate the lateral leakage current.

[0005] However, in the same OLED display panel, the isolation slots set in different areas of the pixel definition layer have different effects on blocking lateral leakage current, resulting in poor display effect of the display panel. Summary of the Invention

[0006] This application provides a display panel and a display device. It can solve the problem of poor display performance in existing OLED display panels. The technical solution is as follows:

[0007] On the one hand, a display panel is provided, including: a driving backplane, a first electrode layer, a pixel definition layer, an organic light-emitting layer, and a second electrode layer;

[0008] The first electrode layer is located on one side of the drive back plate. The first electrode layer has a plurality of separately disposed first electrodes. The first electrodes are electrically connected to the drive back plate. The drive back plate has a groove on the side facing the first electrode layer. The groove is distributed between the orthographic projections of two adjacent first electrodes on the drive back plate. The groove includes at least two first sub-grooves and second sub-grooves distributed in different areas. The depth of the first sub-grooves is greater than the depth of the second sub-grooves.

[0009] The pixel definition layer is located on the side of the first electrode layer away from the driving backplate. The pixel definition layer includes a first definition layer and a second definition layer stacked in a direction perpendicular to and away from the driving backplate, and the pixel definition layer has a pixel opening and a partition groove that pass through the second definition layer and the first definition layer in sequence.

[0010] The organic light-emitting layer is located on the side of the pixel definition layer opposite to the driving backplate;

[0011] The second electrode layer is located on the side of the organic light-emitting layer opposite to the driving backplate;

[0012] Wherein, the distance between the side of the first defining layer away from the drive backplate and the bottom surface of the first sub-groove is greater than the distance between the side of the first defining layer away from the drive backplate and the bottom surface of the second sub-groove.

[0013] Optionally, the side of the first defining layer that forms the pixel opening opposite to the driving backplate is flush, and the side of the first defining layer that faces away from the driving backplate is a plane parallel to the driving backplate.

[0014] Optionally, the first defining layer includes: a first part and a second part connected to each other, wherein the orthographic projection of the first part on the drive back plate is located in the area where the groove is located, and the orthographic projection of the second part on the drive back plate is located within the orthographic projection of the first electrode layer on the drive back plate.

[0015] In the direction perpendicular to the drive backplate, the thickness of the first part is greater than the thickness of the second part.

[0016] Optionally, the pixel definition layer further includes a third definition layer, which is located on the side of the first definition layer facing the driving backplate. The pixel opening and the partition groove also penetrate the third definition layer. The side of the third definition layer facing away from the driving backplate is a plane parallel to the driving backplate. In the direction perpendicular to the driving backplate, the thickness of each position in the first definition layer is the same.

[0017] Optionally, the third defining layer includes: a third part and a fourth part connected together, wherein the orthographic projection of the third part on the drive back plate is located in the area where the groove is located, and the orthographic projection of the fourth part on the drive back plate is located within the orthographic projection of the first electrode layer on the drive back plate.

[0018] In the direction perpendicular to the drive backplate, the thickness of the third part is greater than the thickness of the fourth part.

[0019] Optionally, the display panel further includes: a filling layer, the filling layer being located on the side of the driving back plate where the first electrode layer is disposed, and distributed between two adjacent first electrodes, the portion of the filling layer facing the driving back plate being located within the groove;

[0020] The maximum distance between the side of the filling layer away from the driving backplate and the driving backplate is less than or equal to the distance between the side of the first electrode layer away from the driving backplate and the driving backplate.

[0021] Optionally, the drive backplate has an insulating layer on the side facing the first electrode layer. The insulating layer has the groove and a plurality of through holes corresponding to the plurality of first electrodes. The first electrodes are electrically connected to the drive backplate through the corresponding through holes.

[0022] Optionally, the display panel further includes: a filling layer, the filling layer being located on the side of the driving back plate where the first electrode layer is disposed, and distributed between two adjacent first electrodes, the portion of the filling layer facing the driving back plate being located within the groove;

[0023] Wherein, the side of the filling layer facing away from the driving backplate is a plane parallel to the driving backplate, the distance between the side of the filling layer facing away from the driving backplate and the driving backplate is greater than the distance between the side of the first electrode layer facing away from the driving backplate and the driving backplate, and the filling layer covers the edge portion of the first electrode.

[0024] Optionally, the orthographic projection of the pixel definition layer on the driving backplane is located within the orthographic projection of the filling layer on the driving backplane, and the outer boundary of the orthographic projection of the pixel definition layer on the driving backplane does not coincide with the outer boundary of the orthographic projection of the filling layer on the driving backplane.

[0025] Optionally, the thickness of the first defining layer is the same at all locations in the direction perpendicular to the drive backplate.

[0026] Optionally, the thickness is the same at all locations in the second defined layer.

[0027] Optionally, the pixel definition layer further includes a third definition layer, which is located on the side of the first definition layer facing the driving backplate, and the pixel opening and the partition groove also penetrate the third definition layer;

[0028] The third defining layer protrudes outward from the side opposite to the partition groove relative to the side opposite to the partition groove of the first defining layer; the side opposite to the partition groove of the first defining layer protrudes outward from the side opposite to the partition groove of the second defining layer, or the side opposite to the partition groove of the first defining layer is flush with the side opposite to the partition groove of the second defining layer.

[0029] Optionally, the pixel definition layer further includes a third definition layer, which is located on the side of the first definition layer facing the driving backplate, and the pixel opening and the partition groove also penetrate the third definition layer;

[0030] The third defining layer protrudes outward from the side near the partition groove relative to the side of the first defining layer near the partition groove, and the second defining layer protrudes outward from the side near the partition groove relative to the side of the first defining layer near the partition groove.

[0031] Optionally, the side of the first defining layer near the partition groove includes an arc-shaped concave surface;

[0032] Alternatively, the side of the first defining layer near the partition groove includes an inclined surface, and the angle between the inclined surface and the side of the first defining layer facing the third defining layer is an acute angle;

[0033] Alternatively, the side of the first defining layer near the partition groove includes a first inclined surface and a second inclined surface, the first inclined surface being closer to the drive back plate than the second inclined surface, and the angle between the first inclined surface and the side of the first defining layer facing the third defining layer being an acute angle, and the angle between the second inclined surface and the side of the first defining layer facing the second defining layer being an acute angle.

[0034] On the other hand, a display device is provided, comprising: a driver chip and a display panel, wherein the display panel is the aforementioned display panel, and the driver chip is used to apply a drive signal to the display panel.

[0035] The beneficial effects of the technical solutions provided in this application include at least the following:

[0036] The display panel includes a driving backplane, a first electrode, a pixel definition layer, an organic light-emitting layer, and a second electrode layer. The pixel definition layer may have multiple pixel openings and partition slots, and both the pixel openings and partition slots can sequentially penetrate the second and first definition layers within the pixel definition layer. For any given pixel opening, the side of the second definition layer surrounding that pixel opening facing the driving backplane is flush, ensuring that the indentation height of the partition slots on one side of the pixel opening is the same as the indentation height of the partition slots on the other side. This guarantees that the partition slots on one side of any pixel opening provide the same level of isolation for the organic light-emitting layer as those on the other side. In other words, the partition slots around any pixel opening provide the same level of isolation for lateral leakage current generated in the organic light-emitting layer, thus ensuring a better display effect for the display panel. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 is a schematic diagram of a partial structure of a display panel;

[0039] Figure 2 is a top view of a display panel provided in an embodiment of this application;

[0040] Figure 3 is a cross-sectional view of the display panel shown in Figure 2 at point A-A';

[0041] Figure 4 is a partial cross-sectional schematic diagram of a display panel provided in an embodiment of this application;

[0042] Figure 5 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of this application;

[0043] Figure 6 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of this application;

[0044] Figure 7 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of this application;

[0045] Figure 8 is a schematic diagram of forming photoresist on one side of an insulating layer according to an embodiment of this application;

[0046] Figure 9 is a schematic diagram of a patterned photoresist provided in an embodiment of this application;

[0047] Figure 10 is a schematic diagram of forming a first electrode on one side of a patterned photoresist according to an embodiment of this application;

[0048] Figure 11 is a schematic diagram of a stripping patterned photoresist according to an embodiment of this application;

[0049] Figure 12 is a partial cross-sectional schematic diagram of a display panel provided in another embodiment of this application;

[0050] Figure 13 is a partial cross-sectional schematic diagram of another display panel provided in another embodiment of this application;

[0051] Figure 14 is a partial cross-sectional schematic diagram of another display panel provided in another embodiment of this application. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0053] In related technologies, a silicon-based OLED display panel may include a driving backplane and multiple light-emitting devices located on the driving backplane. Each light-emitting device includes a first electrode, a light-emitting layer, and a second electrode. The light-emitting layer is composed of at least one sub-light-emitting layer. Each sub-light-emitting layer may include a stacked hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer. When the light-emitting layer is composed of multiple stacked sub-light-emitting layers, the sub-light-emitting layers are connected in series through a charge generation layer. Thus, the color of the light emitted by the light-emitting layer is determined by the multiple sub-light-emitting layers. For example, if the light-emitting layer needs to emit white light, sub-light-emitting layers capable of emitting red, green, and blue light can be stacked to make the light-emitting layer emit white light. Alternatively, sub-light-emitting layers capable of emitting yellow and blue light can be stacked to make the light-emitting layer emit white light.

[0054] The first electrode is electrically connected to the driving backplane. When a voltage is applied to the first electrode, an electric field is formed between the first and second electrodes. Thus, the hole injection layer can inject holes into the hole transport layer, which then transports them to the luminescent material layer. Similarly, the electron injection layer can inject electrons into the electron transport layer, which also transports them to the luminescent material layer. Holes and electrons combine within the luminescent material layer to form high-energy excitons. These high-energy excitons are unstable and easily transition to low-energy excitons, releasing energy and generating photons that emit light within a specific wavelength range. When the luminescent layer consists of multiple sub-emitting layers, the charge generation layer is typically made of a material with good conductivity to ensure that each sub-emitting layer can emit light, thereby improving the luminescence effect of the luminescent layer.

[0055] Since the light-emitting layers in each light-emitting device are uniformly deposited using a vapor deposition process, they are interconnected. To prevent lateral leakage current generated by the charge generation layer in one light-emitting device from causing adjacent devices to emit light during illumination, a pixel definition layer is needed between adjacent devices. This pixel definition layer is equipped with isolation slots to isolate the charge generation layer, thus preventing lateral leakage current. A filler layer can also be provided on the side of the pixel definition layer closest to the driving backplane to reduce the overall discontinuity of the pixel definition layer.

[0056] During the fabrication of a display panel, to ensure that two adjacent first electrodes do not connect, the etching time is typically increased to remove all portions distributed between the two adjacent first electrodes. However, this also introduces the problem of over-etching. Typically, because the concentration of the etching solution varies across different areas of the display panel, the over-etching depth will differ in different areas after the over-etching process.

[0057] Therefore, as shown in Figure 1, during the formation of the first electrode layer 200 in the display panel 000, after the portion between two adjacent first electrodes 210 is over-etched, the insulating layer 110 in the drive backplate 100 is also etched to form a groove O on the side of the insulating layer 110 facing the first electrode layer 200. Because the concentration of the etching solution varies in different areas during the over-etching process, the depth of the groove O formed on the insulating layer 110 in different areas is different. Thus, after the filling layer 600 is formed between two adjacent first electrodes 210, the distance between the side of the filling layer 600 facing away from the drive backplate 100 and the drive backplate 100 in different areas will be different.

[0058] Typically, to ensure the isolation effect of the partition grooves U in the pixel definition layer 300, the pixel definition layer 300 can be composed of two or more layers of inorganic insulating layers stacked together. Thus, when the distance between the side of the filling layer 600 facing away from the driving backplate 100 and the driving backplate 100 varies in different regions, the flatness of the inorganic insulating layers in the pixel definition layer 300 facing away from the driving backplate 100 is poor. Consequently, for a certain pixel opening K, the inscribed height h1 of the partition grooves U distributed on one side of the pixel opening K is different from the inscribed height h2 of the partition grooves U distributed on the other side of the pixel opening K. Furthermore, since the inscribed height of the partition grooves U directly affects their isolation effect on the charge generation layer, different inscribed heights of the partition grooves U at different locations will result in different isolation effects of the partition grooves U distributed on one side of the pixel opening K on the charge generation layer compared to the partition grooves U distributed on the other side of the pixel opening K on the charge generation layer. Therefore, in the same display panel, the isolation slots U set in different areas of the pixel definition layer 300 have different isolation effects on lateral leakage current, resulting in poor display effect of the display panel.

[0059] It should be noted that the inner tangent height of the partition groove U refers to the vertical distance between the portion of the outermost inorganic insulating layer in the pixel definition layer 300 near the partition groove U and the first electrode 210.

[0060] To address the aforementioned technical problems, this application provides a display panel. Please refer to Figures 2 and 3. Figure 2 is a top view of a display panel provided in this application, and Figure 3 is a cross-sectional view of the display panel shown in Figure 2 at point A-A'. The display panel 000 may include: a driving backplate 100, a first electrode layer 200, a pixel definition layer 300, an organic light-emitting layer 400, and a second electrode layer 500.

[0061] The first electrode layer 200 in the display panel 000 is located on one side of the driving back plate 100. The first electrode layer 200 has a plurality of separately disposed first electrodes 210, which are electrically connected to the driving back plate 100. A groove O is provided on the side of the driving back plate 100 facing the first electrode layer 200. The groove O is distributed between the orthographic projections of two adjacent first electrodes 210 on the driving back plate 100, and the groove O includes at least two first sub-grooves O1 and second sub-grooves O2 distributed in different regions. The depth of the first sub-grooves O1 is greater than the depth of the second sub-grooves O2.

[0062] For example, as shown in Figure 3, due to the different concentrations of the etching solution distributed in different areas during the over-etching process, the depths of the first sub-groove O1 distributed on one side of the first electrode 210 and the second sub-groove O2 distributed on the other side of the first electrode 210 are different, with the depth d1 of the first sub-groove O1 being greater than the depth d2 of the second sub-groove O2.

[0063] The pixel definition layer 300 in the display panel 000 is located on the side of the first electrode layer 200 facing away from the driving backplate 100. The pixel definition layer 300 includes a first definition layer 310 and a second definition layer 320 stacked along a direction perpendicular to and away from the driving backplate 100. The pixel definition layer 300 has pixel openings K and partition grooves U that sequentially penetrate the second definition layer 320 and the first definition layer 310. The number of pixel openings K in the pixel definition layer 300 can be multiple, and the partition grooves U can be distributed between two adjacent pixel openings K. Each pixel opening K corresponds one-to-one with a plurality of first electrodes 210. Here, the orthographic projection of each pixel opening K in the pixel definition layer 300 onto the driving backplate 100 lies within the orthographic projection of the corresponding first electrode 210 onto the driving backplate 100.

[0064] The organic light-emitting layer 400 in the display panel 000 is located on the side of the pixel definition layer 300 opposite to the driving backplate 100. The organic light-emitting layer 400 may be composed of multiple layers of organic material stacked together, and these organic material layers may include at least one sub-light-emitting layer. Each sub-light-emitting layer includes: a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer stacked along a direction perpendicular to and away from the driving backplate 100. In the case where the multiple organic material layers include multiple sub-light-emitting layers, the individual sub-light-emitting layers are connected in series through a charge generation layer. The isolation groove U in the pixel definition layer 300 may isolate at least a portion of the organic material layers in the organic light-emitting layer 400. For example, the isolation groove U may isolate the charge generation layer in the organic light-emitting layer 400, thereby isolating lateral leakage current. Of course, the hole injection layer, hole transport layer, light-emitting material layer, electron transport layer, and electron injection layer in the organic light-emitting layer 400 may also be isolated by the isolation groove U.

[0065] The second electrode layer 500 in the display panel 000 is located on the side of the organic light-emitting layer 400 away from the driving backplate 100.

[0066] It should be noted that the portion of the organic light-emitting layer 400 distributed within each pixel opening K can contact the corresponding first electrode 210. In this case, for any pixel opening K, the first electrode 210 corresponding to this pixel opening K, and the portions of the organic light-emitting layer 400 and the second electrode layer 500 distributed within this pixel opening K can form a light-emitting device.

[0067] It should also be noted that, in order to ensure a good blocking effect of the isolation slots U on lateral leakage current, as shown in Figure 2, the isolation slots U in the pixel definition layer 300 can be distributed around the periphery of each pixel opening K. That is, for any pixel opening K, there will be a ring of isolation slots U distributed around this pixel opening K, which can ensure that the lateral leakage current generated in any direction during the light emission process of a certain light-emitting device will be blocked by the isolation slots U distributed around the light-emitting device.

[0068] It should be noted that both the first defining layer 310 and the second defining layer 320 are inorganic insulating layers. When the depths of the first sub-groove O1 and the second sub-groove O2 in the groove O are different, the flatness of the side of the first defining layer 310 facing away from the driving backplate 100 is poor. This application can process a portion of the film layer in the display panel located on the side of the second defining layer 320 facing the driving backplate 100, thereby improving the flatness of the side of the first defining layer 310 facing away from the driving backplate 100.

[0069] In this case, the distance D1 between the side of the first defining layer 310 away from the drive back plate 100 and the bottom surface of the first sub-groove O1 is greater than the distance D2 between the side of the first defining layer 310 away from the drive back plate 100 and the bottom surface of the second sub-groove O2.

[0070] For example, for any pixel opening K, the side of the first defining layer 310 used to form the pixel opening K that is away from the driving backplate 100 is flush, which in turn ensures that the side of the second defining layer 320 used to form the pixel opening K that is facing the driving backplate 100 is flush.

[0071] To more clearly see the morphology of the partition grooves U around the pixel opening K, please refer to Figure 4. Figure 4 is a partial cross-sectional schematic diagram of a display panel provided in an embodiment of this application. The display panel shown in Figure 4 does not show the organic light-emitting layer 400 and the second electrode layer 500. For any pixel opening K, when the second defining layer 320 used to surround the pixel opening K is flush with the side facing the driving back plate 100, the inscribed height H1 of the partition grooves U distributed on one side of the pixel opening K is the same as the inscribed height H2 of the partition grooves U distributed on the other side of the pixel opening K. Therefore, it can be ensured that the partition grooves U distributed on one side of the pixel opening K have the same isolation effect on the charge generation layer in the organic light-emitting layer 400 as the partition grooves U distributed on the other side of the pixel opening K. That is, for any pixel opening K, the partition grooves U distributed around the pixel opening K have the same isolation effect on lateral leakage current, thereby ensuring a better display effect of the display panel.

[0072] It should be noted that the second definition layer 320 in the pixel definition layer 300 can be considered as the outermost inorganic insulating layer, that is, the second definition layer 320 is the inorganic insulating layer in the pixel definition layer 300 that is furthest from the driving backplate 100. Therefore, the vertical distance between the portion of the second definition layer 320 near the partition groove U and the first electrode layer 200 is the inscribed height of this partition groove U.

[0073] In summary, the display panel provided in this application includes: a driving backplane, a first electrode, a pixel definition layer, an organic light-emitting layer, and a second electrode layer. The pixel definition layer may have multiple pixel openings and partition slots, and both the pixel openings and partition slots can sequentially penetrate the second definition layer and the first definition layer within the pixel definition layer. For any given pixel opening, the side of the second definition layer surrounding this pixel opening facing the driving backplane is flush, such that the inscribed height of the partition slots distributed on one side of this pixel opening is the same as the inscribed height of the partition slots distributed on the other side of this pixel opening. Therefore, it can be ensured that the partition slots distributed on one side of any pixel opening have the same isolation effect on the organic light-emitting layer as the partition slots on the other side of this pixel opening. That is, the partition slots distributed around any pixel opening have the same isolation effect on the lateral leakage current generated in the organic light-emitting layer, thereby ensuring a better display effect of the display panel.

[0074] In this application, as shown in FIG4, the side of the first defining layer 310 facing away from the driving backplate 100 is a plane parallel to the driving backplate 100. In this case, the side of the second defining layer 320 facing the driving backplate 100 is also a plane parallel to the driving backplate 100. Therefore, the vertical distance between the second defining layer 320 and the first electrode layer 200 at any position is equal, so that the inscribed height of the isolation groove U of the pixel defining layer 300 is the same at any position. This ensures the isolation effect of the isolation groove U at any position on the charge generation layer in the organic light-emitting layer 400, that is, it ensures that the isolation effect of the isolation groove U at any position on the lateral leakage current is the same. In this way, the display effect of the display panel can be further improved.

[0075] It should be noted that the pixel definition layer 300 in the display panel 000 may include two or three inorganic insulating layers. Of course, it may also include more than one inorganic insulating layer, and this embodiment does not limit this.

[0076] Here, when the pixel definition layer 300 includes two inorganic insulating layers, as shown in Figure 4, these two inorganic insulating layers can be a first definition layer 310 and a second definition layer 320, respectively. The second definition layer 320 can be located on the side of the first definition layer 310 facing away from the driving backplate 100, and the partition groove U and pixel opening K in the pixel definition layer 300 can sequentially penetrate the second definition layer 320 and the first definition layer 310.

[0077] To ensure that the isolation groove U in the pixel definition layer 300, composed of the first definition layer 310 and the second definition layer 320, has the ability to block lateral leakage current, the side of the second definition layer 320 closest to the isolation groove U needs to protrude outward relative to the side of the first definition layer 310 closest to the isolation groove U, so that a concave structure can be formed on the inner wall of the isolation groove U. Thus, after the organic light-emitting layer 400 is formed by the vapor deposition process, a portion of the organic material layer in the organic light-emitting layer 400 can be blocked by the concave structure on the inner wall of the isolation groove U, thereby ensuring that the isolation groove U has the ability to block lateral leakage current.

[0078] When the pixel definition layer 300 includes three inorganic insulating layers, please refer to Figure 5, which is a partial cross-sectional schematic diagram of another display panel provided in this application embodiment. These three inorganic insulating layers can be: a first definition layer 310, a second definition layer 320, and a third definition layer 330, respectively. The second definition layer 320 can be located on the side of the first definition layer 310 facing away from the driving backplate 100, and the third definition layer 330 can be located on the side of the first definition layer 310 facing the driving backplate 100. The partition groove U and the pixel opening K in the pixel definition layer 300 can sequentially penetrate the second definition layer 320, the first definition layer 310, and the third definition layer 330.

[0079] To ensure that the partition groove U in the pixel definition layer 300, composed of the first definition layer 310, the second definition layer 320, and the third definition layer 330, has the ability to block lateral leakage current, it is necessary to ensure that the side of the second definition layer 320 near the partition groove U protrudes outward relative to the side of the first definition layer 310 near the partition groove U, and it is also necessary to ensure that the side of the third definition layer 330 near the partition groove U protrudes outward relative to the side of the first definition layer 310 near the partition groove U, so that a concave structure can be formed on the inner wall of the partition groove U. Thus, after the organic light-emitting layer 400 is formed by the vapor deposition process, a portion of the organic material layer in the organic light-emitting layer 400 can be blocked by the concave structure on the inner wall of the partition groove U, thereby ensuring that the partition groove U has the ability to block lateral leakage current.

[0080] Optionally, as shown in Figures 4 and 5, each of the first electrodes 210 in the first electrode layer 200 may include a first sub-electrode 201, a second sub-electrode 202, and a third sub-electrode 203 stacked along a direction perpendicular to and away from the driving backplate 100. Here, the main material of the first sub-electrode 201 is titanium or titanium nitride, and the first sub-electrode 201 is used to enhance the adhesion between the second sub-electrode 202 and the driving backplate 100; the main material of the second sub-electrode 202 is aluminum or silver, and the second sub-electrode 202 is used to reflect the light emitted from the organic light-emitting layer 400 along the direction toward the driving backplate 100, so that the reflected light can be emitted in a direction away from the driving backplate 100, and the reflected light and the light emitted from the organic light-emitting layer 400 in the direction away from the driving backplate 100 can coherently interact, thereby generating a coherently enhanced microcavity effect and improving the light extraction efficiency of the display panel 000. The main material of the third sub-electrode 203 is indium tin oxide or indium zinc oxide. The third sub-electrode 203 made of indium tin oxide or indium zinc oxide can improve the work function of the second sub-electrode 202 with reflective properties, which is beneficial to improving the electrical performance of the first electrode 210.

[0081] In this application, the drive backplate 100 has an insulating layer 110 on the side facing the first electrode layer 200. The insulating layer 110 has a plurality of through holes G corresponding one-to-one with the plurality of first electrodes 210, and the first electrodes 210 are electrically connected to the drive backplate 100 through the corresponding through holes G.

[0082] In this application, the display panel 000 may further include a filling layer 600. The filling layer 600 may be located on the side of the drive back plate 100 where the first electrode layer 200 is disposed, and is distributed between two adjacent first electrodes 210 in the first electrode layer 200. The portion of the filling layer 600 facing the drive back plate 100 is located in the groove O.

[0083] In this case, the pixel definition layer 300 in the display panel 000 can be distributed with the filling layer 600 on the side away from the driving backplate 100, thereby locally raising the pixel definition layer 300 to reduce the overall step difference of the pixel definition layer 300.

[0084] In this embodiment, the maximum distance between the side of the filling layer 600 facing away from the driving backplate 100 and the driving backplate 100 can be less than or equal to the distance between the side of the first electrode layer 200 facing away from the driving backplate 100 and the driving backplate 100. Of course, the maximum distance between the side of the filling layer 600 facing away from the driving backplate 100 and the driving backplate 100 can also be greater than the distance between the side of the first electrode layer 200 facing away from the driving backplate 100 and the driving backplate 100. For different types of filling layers, this embodiment will illustrate the following two optional implementation methods as examples.

[0085] In a first optional implementation, when the maximum distance between the side of the filling layer 600 facing away from the driving backplate 100 and the driving backplate 100 is less than or equal to the distance between the side of the first electrode layer 200 facing away from the driving backplate 100 and the driving backplate 100, as shown in Figures 4 and 5, due to over-etching issues during the fabrication of the first electrode layer 200 in the display panel 100, the side of the distributed insulating layer 110 facing the driving backplate has grooves O, and the depths of the grooves O distributed in different regions are different. Here, the orthographic projection of the grooves O of the insulating layer 110 on the driving backplate 100 can be located between the orthographic projections of two adjacent first electrodes 210 on the driving backplate 100. For example, the orthographic projection of the grooves O on the driving backplate 100 can surround the periphery of the orthographic projections of each first electrode 210 on the driving backplate 100. During the formation of the filling layer 600, the groove O is filled with the filling layer 600, which may cause the distance between the side of the filling layer 600 facing away from the drive backplate 100 and the drive backplate 100 in different areas to be different.

[0086] In this case, in order to improve the flatness of the side of the first definition layer 310 in the pixel definition layer 300 that faces away from the driving backplate 100, so that the side of the first definition layer 310 that faces away from the driving backplate 100 is a plane parallel to the driving backplate 100, the embodiments of this application propose the following two improvement schemes:

[0087] The first improvement involves grinding the side of the first definition layer 310 in the pixel definition layer 300 that faces away from the driving backplane 100. This improvement can be applied to either a pixel definition layer 300 composed of two inorganic insulating layers or a pixel definition layer 300 composed of three inorganic insulating layers.

[0088] For example, since the first defining layer 310 is an inorganic insulating layer, and the flatness of the first electrode layer 100 and the filling layer 600 in the display panel 100 on the side away from the driving backplate 100 is poor, the first defining layer 310 is formed directly on the side away from the driving backplate 100 of the first electrode layer 100 and the filling layer 600, or the third defining layer 330 is formed first on the side away from the driving backplate 100 of the first electrode layer 100 and the filling layer 600, and then the first defining layer 310 is formed on the side away from the driving backplate 100 of the third defining layer 330, resulting in poor flatness of the first defining layer 310 away from the substrate 100. Therefore, after the first defining layer 310 is formed, the side of the first defining layer 310 facing away from the drive backplate 100 can be ground flat to improve the flatness of the side of the first defining layer 310 facing away from the drive backplate 100, so that the side of the first defining layer 310 facing away from the drive backplate 100 is a plane parallel to the drive backplate 100.

[0089] In this configuration, as shown in Figures 4 and 5, the first definition layer 310 in the pixel definition layer 300 may include a first portion 311 and a second portion 312 connected to each other. The orthographic projection of the first portion 311 onto the driving backplate 100 lies within the region containing the groove O, and the orthographic projection of the second portion 312 onto the driving backplate 100 lies within the orthographic projection of the first electrode layer 200 onto the driving backplate 100. Here, in the direction perpendicular to the driving backplate 100, the thickness of the first portion 311 is greater than the thickness of the second portion 312.

[0090] That is, after the side of the first defining layer 310 facing away from the drive backplate 100 is ground flat, the thickness of the first defining layer 310 at different locations is different. Here, because the distance between the first portion 311 of the first defining layer 310 facing the drive backplate 100 and the drive backplate 100 is small, and the distance between the second portion 312 of the first defining layer 310 facing the drive backplate 100 and the drive backplate 100 is large, during the process of grinding the side of the first defining layer 310 facing away from the drive backplate 100, the thickness of the first portion 311 of the first defining layer 310 that is ground flat is small, while the thickness of the second portion 312 of the first defining layer 310 that is ground flat is large. Therefore, after grinding the side of the first defining layer 310 facing away from the drive backplate 100, the thickness of the first portion 311 remaining in the first defining layer 310 will be greater than the thickness of the second portion 312 remaining.

[0091] It should be noted that after the second defining layer 320 is formed on the side of the first defining layer 310 that is away from the drive backplate 100 after being ground down, it can be ensured that both the side of the second defining layer 320 facing the drive backplate 100 and the side of the second defining layer 320 away from the drive backplate 100 are planes parallel to the drive backplate 100. Therefore, the thickness of the second defining layer 320 is the same at all locations in the direction perpendicular to the drive backplate 100.

[0092] The second improvement mainly targets the pixel definition layer 300, which consists of three inorganic insulating layers. Please refer to Figure 6, which is a partial cross-sectional schematic diagram of another display panel provided in this embodiment. The side of the third definition layer 330 in the pixel definition layer 300 facing away from the driving backplate 100 can be ground flat, so that the side of the third definition layer 330 facing away from the driving backplate 100 is a plane parallel to the driving backplate 100.

[0093] In this configuration, the third definition layer 330 in the pixel definition layer 300 may include a third portion 331 and a fourth portion 332 connected to each other. The orthographic projection of the third portion 331 onto the driving backplate 100 lies within the region containing the groove O, and the orthographic projection of the fourth portion 332 onto the driving backplate 100 lies within the orthographic projection of the first electrode layer 200 onto the driving backplate 100. Here, in the direction perpendicular to the driving backplate 100, the thickness of the third portion 331 is greater than the thickness of the fourth portion 332.

[0094] That is, after the side of the third definition layer 330 facing away from the drive backplate 100 is ground flat, the thickness of the third definition layer 330 at different locations is different. Here, because the distance between the third portion 331 of the third definition layer 330 facing the drive backplate 100 and the drive backplate 100 is small, and the distance between the fourth portion 332 of the third definition layer 330 facing the drive backplate 100 and the drive backplate 100 is large, during the process of grinding the side of the third definition layer 330 facing away from the drive backplate 100, the thickness of the third portion 331 of the third definition layer 330 that is ground flat is small, while the thickness of the fourth portion 332 of the third definition layer 330 that is ground flat is large. Therefore, after grinding the side of the third definition layer 330 facing away from the drive backplate 100, the thickness of the remaining third portion 331 in the third definition layer 330 will be greater than the thickness of the remaining fourth portion 332.

[0095] For example, since the third defining layer 330 is an inorganic insulating layer, and the flatness of the first electrode layer 100 and the filling layer 600 in the display panel 100 on the side facing away from the driving backplate 100 is poor, forming the third defining layer 330 directly on the side of the first electrode layer 100 and the filling layer 600 facing away from the driving backplate 100 will result in poor flatness of the third defining layer 330 facing away from the substrate 100. Therefore, after forming the third defining layer 310, the side of the third defining layer 330 facing away from the driving backplate 100 can be ground flat to improve the flatness of this side, making it a plane parallel to the driving backplate 100.

[0096] It should be noted that after the third defining layer 330, which has been ground smooth, is formed on the side facing away from the drive backplate 100, the side of the first defining layer 310 facing the drive backplate 100 and the side of the first defining layer 310 facing away from the drive backplate 100 are both planes parallel to the drive backplate 100. Therefore, in the direction perpendicular to the drive backplate 100, the thickness of the first defining layer 310 is the same at all locations.

[0097] Similarly, since the side of the first defining layer 310 facing away from the drive backplate 100 is a plane parallel to the drive backplate 100, after the second defining layer 320 is formed on the side of the first defining layer 310 facing away from the drive backplate 100, it can be ensured that both the side of the second defining layer 320 facing the drive backplate 100 and the side of the second defining layer 320 facing away from the drive backplate 100 are planes parallel to the drive backplate 100. Therefore, the thickness of the second defining layer 320 is the same at all locations in the direction perpendicular to the drive backplate 100.

[0098] In the second optional implementation, when the maximum distance between the side of the filling layer 600 away from the driving back plate 100 and the driving back plate 100 is greater than the distance between the side of the first electrode layer 200 away from the driving back plate 100 and the driving back plate 100, please refer to Figure 7. Figure 7 is a partial cross-sectional schematic diagram of another display panel provided in the embodiment of this application. The side of the filling layer 600 away from the driving back plate 100 will protrude from the side of the first electrode layer 200 away from the driving back plate 100.

[0099] In this case, to ensure good flatness of each inorganic insulating layer in the pixel definition layer 300 formed subsequently on the side of the filling layer 600 facing away from the substrate 100, it is necessary to ensure that the side of the filling layer 600 facing away from the driving backplate 100 is a plane parallel to the driving backplate 100, and that the orthographic projection of the pixel definition layer 300 on the driving backplate 100 lies within the orthographic projection of the filling layer 600 on the driving backplate 100. Thus, after forming each inorganic insulating layer in the pixel definition layer 300 on the side of the filling layer 600 facing away from the substrate 100, it can be ensured that both the side of these inorganic insulating layers facing the driving backplate 100 and the side facing away from the driving backplate 100 are parallel to the plane of the driving backplate 100. That is, in the direction perpendicular to the driving backplate 100, the thickness of each position in any inorganic insulating layer of the pixel definition layer 300 is the same.

[0100] It should be noted that, normally, the pixel definition layer 300 needs to cover the edge portions of each first electrode 210 in the first electrode layer 200 to prevent etching marks generated at the edges of the first electrodes 210 after etching from interfering with the normal light emission of the light-emitting device 200. However, when the filling layer 600 protrudes from the side of the first electrode layer 200 away from the driving backplate 100, and the orthographic projection of the pixel definition layer 300 on the driving backplate 100 lies within the orthographic projection of the filling layer 600 on the driving backplate 100, the pixel definition layer 300 will not cover the edge portions of each first electrode 210. Therefore, the filling layer 600 is needed to cover the edge portions of each first electrode 210. That is, the filling layer 600 can cover the edge portions of each first electrode 210.

[0101] It should also be noted that when the side of the filling layer 600 facing away from the driving backplate 100 protrudes from the side of the first electrode layer 200 facing away from the driving backplate 100, there are various design methods to make the side of the filling layer 600 facing away from the driving backplate 100 a plane parallel to the driving backplate 100. This application embodiment will illustrate with the following two design methods as examples:

[0102] The first design method involves directly grinding the side of the filling layer 600 that faces away from the drive backplate 100.

[0103] For example, as shown in FIG7, due to over-etching issues during the fabrication of the first electrode layer 200 in the display panel 100, the insulating layer 110 in the display panel 000 has a groove O on the side facing the first electrode layer 200. A portion of the filling layer 600 in the display panel 000 may be located within this groove O. Here, the orthographic projection of the groove O of the insulating layer 110 onto the driving backplate 100 may be located between the orthographic projections of two adjacent first electrodes 210 onto the driving backplate 100. For example, the orthographic projection of the groove O onto the driving backplate 100 may surround the periphery of the orthographic projections of each of the first electrodes 210 onto the driving backplate 100.

[0104] Furthermore, due to the varying concentrations of the etching solution distributed in different areas during the over-etching process, the depths of the grooves O formed on the insulating layer 110 in different areas differ. In this case, to ensure that the side of the filling layer 600 facing away from the driving backplate 100 is parallel to the plane of the driving backplate 100, the thickness of the filling layer 600 can be increased. That is, it is necessary to ensure that the side of the formed filling layer 600 facing away from the driving backplate 100 protrudes from the side of the first electrode layer 200 facing away from the driving backplate. The portion of the filling layer 600 protruding from the first electrode layer 200 can be ground flat, so that the side of the filling layer 600 facing away from the driving backplate 100 is parallel to the plane of the driving backplate 100.

[0105] The second design improves the fabrication process of the first electrode layer 200, so that the side of the insulating layer 110 facing the first electrode layer 200 no longer forms a groove O. Under this premise, the side of the filling layer 600 facing away from the drive backplate 100 is then ground smooth.

[0106] For example, as shown in FIG8, a photoresist film 700a is first coated on one side of the insulating layer 110. Then, as shown in FIG9, the photoresist film 700a can be exposed and developed to obtain a patterned photoresist pattern 700b. Here, the orthographic projection of the photoresist pattern 700b on the driving backplate 100 can surround the periphery of the orthographic projections of the subsequently formed light-emitting devices on the driving backplate. Afterwards, as shown in FIG10, a metal conductive film 200a is formed on the side of the photoresist pattern 700b away from the driving backplate 100. Here, a portion of the metal conductive film 200a is located on the side of the photoresist pattern 700b away from the driving backplate 100, and the orthographic projections of the other portions of the metal conductive film 200a on the driving backplate 100 do not coincide with the orthographic projections of the photoresist pattern 700a on the driving backplate 100. Finally, as shown in Figure 11, the photoresist pattern 700b is stripped. At this time, the portion of the metal conductive film 200a located on the side of the photoresist pattern 700b facing away from the driving backplate 100 is stripped along with the photoresist pattern 800b. This allows the non-overlapping portions of the metal conductive film 200a and the photoresist pattern 700a to be retained, ultimately forming the first electrode layer 200. In this case, there is no need to over-etch the first electrode layer 200, so that the side of the insulating layer 110 facing the first electrode 210 will no longer form a groove O. That is, the side of the insulating layer 110 facing the first electrode 210 can be a plane parallel to the driving backplate 100. This effectively improves the flatness of the subsequently formed film layer.

[0107] After fabricating the first electrode layer 200 using the process flow shown in Figures 8 to 12, and subsequently forming the fill layer 600 and pixel definition layer 300, the display panel shown in Figure 12 can be referenced. Figure 12 is a partial cross-sectional schematic diagram of a display panel according to another embodiment of this application. Since the side of the insulating layer 110 facing the first electrode layer 200 no longer forms a groove O, the flatness of the fill layer 600 formed on the driving backplate 100 is relatively high. Thus, during the grinding process of the side of the fill layer 600 facing away from the driving backplate 100, the thickness of the portion of the fill layer 600 removed by grinding can be kept relatively small, thereby simplifying the grinding process of the fill layer 600.

[0108] It should be noted that the above embodiments illustrate various possible implementations of the display panel 000. The following embodiments will describe other features of the pixel definition layer 300 in the display panel 000 based on Figures 6 and 7:

[0109] When the maximum distance between the filling layer 600 and the driving backplate 100 on the side facing away from the driving backplate 100 is less than or equal to the distance between the first electrode layer 200 and the driving backplate 100 on the side facing away from the driving backplate 100, as shown in FIG6, the third definition layer 330 in the pixel definition layer 300 can cover the edge portion of each first electrode 210 in the first electrode layer 200.

[0110] In the pixel definition layer 300, the side of the third definition layer 330 facing away from the partition groove U protrudes outward relative to the side of the first definition layer 310 facing away from the partition groove U, and the side of the first definition layer 310 facing away from the partition groove U protrudes outward relative to the side of the second definition layer 320 facing away from the partition groove U. In this case, the pixel opening K may include: a first sub-opening for penetrating the second sub-definition layer 320, a second sub-opening for penetrating the first definition layer 310, and a third sub-opening for penetrating the third definition layer 330, and the third sub-opening, the second sub-opening, and the first sub-opening in the pixel opening K can be sequentially connected and arranged along a direction away from the driving backplate 100. Therefore, the size of the third sub-opening in the third definition layer 330 is smaller than the size of the second sub-opening in the first definition layer 310; the size of the second sub-opening in the first definition layer 310 is smaller than the size of the third sub-opening in the second definition layer 320. That is, the sizes of the first sub-aperture, the second sub-aperture, and the third sub-aperture within the pixel aperture K decrease sequentially.

[0111] In this configuration, the pixel opening K in the pixel definition layer 300 is a stepped opening. This ensures that the portions of the organic light-emitting layer 400 and the second electrode layer 500 subsequently formed on the side of the pixel definition layer 300 opposite to the driving backplate 100 are relatively flat within the pixel opening K. This results in a relatively small overall step difference within these portions, making the thickness of the portion of the organic light-emitting layer 400 located in the central region of the pixel opening K approximately equal to the thickness of the portion located in the peripheral region of the pixel opening K. This ensures high uniformity of light emission from each light-emitting device in the display panel 000.

[0112] Furthermore, since the third sub-aperture closest to the driving backplate 100 in the pixel definition layer 300 has the smallest size, and the third sub-aperture penetrates through the third definition layer 330, for the same type of light-emitting device, it is only necessary to ensure that the width of each first electrode 210 covered by the third definition layer 330 in the same type of light-emitting device is the same. This allows the size of the third sub-aperture in each pixel opening K corresponding to the same type of light-emitting device to be the same, thereby ensuring that the light-emitting area of ​​the organic light-emitting layer 400 in the same type of light-emitting device is the same, effectively improving the uniformity of light emission of the same type of light-emitting device. Here, the same type of light-emitting device refers to a light-emitting device capable of emitting light of the same color.

[0113] When the maximum distance between the filling layer 600 and the driving backplate 100 on the side facing away from the driving backplate 100 is greater than the distance between the first electrode layer 200 and the driving backplate 100 on the side facing away from the driving backplate 100, as shown in FIG7, since the filling layer 600 can cover the edge portions of each first electrode 210 in the first electrode layer 200, the pixel definition layer 300 does not need to separately cover the edge portions of each first electrode 210 in the first electrode layer 200. Therefore, the orthographic projection of the pixel definition layer 300 on the driving backplate 100 can not coincide with the orthographic projection of the filling layer 600 on the driving backplate 100. That is, the side of the filling layer 600 facing the pixel opening K can protrude outward relative to the side of the pixel definition layer 300 facing the pixel opening K.

[0114] In this scenario, for the same type of light-emitting device, it is only necessary to ensure that the width of the filling layer 600 covering each of the first electrodes 210 in the same type of light-emitting device is the same. This will ensure that the light-emitting area of ​​the organic light-emitting layer 400 in the same type of light-emitting device is the same, effectively improving the uniformity of light emission in the same type of light-emitting device. Here, "the same type of light-emitting device" refers to a light-emitting device capable of emitting light of the same color.

[0115] In the pixel definition layer 300, the side of the third definition layer 330 facing away from the partition groove U protrudes outward relative to the side of the first definition layer 310 facing away from the partition groove U, and the side of the first definition layer 310 facing away from the partition groove U protrudes outward relative to the side of the second definition layer 320 facing away from the partition groove U. Since the side of the filling layer 600 facing the pixel opening K protrudes outward relative to the side of the pixel definition layer 300 facing the pixel opening K, the side of the filling layer 600 facing the pixel opening K can also protrude outward relative to the side of the third definition layer 330 facing the pixel opening K. In this case, the pixel opening K can include: a first sub-opening for penetrating the second sub-definition layer 320, a second sub-opening for penetrating the first definition layer 310, a third sub-opening for penetrating the third definition layer 330, and a fourth sub-opening for penetrating the filling layer 600. Furthermore, the fourth, third, second, and first sub-openings in pixel opening K can be sequentially connected and arranged along a direction away from the driving backplane 100. Therefore, the size of the fourth sub-opening in the filling layer 600 is smaller than the size of the third sub-opening in the third definition layer 330; the size of the third sub-opening in the third definition layer 330 is smaller than the size of the second sub-opening in the first definition layer 310; and the size of the second sub-opening in the first definition layer 310 is smaller than the size of the third sub-opening in the second definition layer 320. That is, the sizes of the first, second, third, and fourth sub-openings within pixel opening K decrease sequentially.

[0116] In this configuration, the pixel opening K in the pixel definition layer 300 is a stepped opening. This ensures that the portions of the organic light-emitting layer 400 and the second electrode layer 500 subsequently formed on the side of the pixel definition layer 300 opposite to the driving backplate 100 are relatively flat within the pixel opening K. This results in a relatively small overall step difference within these portions, making the thickness of the portion of the organic light-emitting layer 400 located in the central region of the pixel opening K approximately equal to the thickness of the portion located in the peripheral region of the pixel opening K. This ensures high uniformity of light emission from each light-emitting device in the display panel 000.

[0117] It should be noted that in other possible implementations, the side of the first defining layer 310 facing away from the partition groove U can also be flush with the side of the second defining layer 320 facing away from the partition groove U, as long as the side of the third defining layer 330 facing away from the partition groove U protrudes outward relative to the side of the first defining layer 310 facing away from the partition groove U. This application does not limit this aspect.

[0118] In this embodiment, a concave structure needs to be formed on the sidewall of the partition groove U to enable the partition groove U to block lateral leakage current. Furthermore, to ensure a good ability to block lateral leakage current, the lateral dimension of the concave structure on the sidewall of the partition groove U needs to be limited. Specifically, the width of the protrusion of the second defining layer 320 near the partition groove U relative to the side of the first defining layer 310 near the partition groove U needs to be greater than or equal to 0.05 micrometers, and the width of the protrusion of the third defining layer 330 near the partition groove U relative to the side of the first defining layer 310 near the partition groove U needs to be greater than or equal to 0.05 micrometers.

[0119] It should be noted that, in this embodiment, it is only necessary to ensure that the width of the protrusion of the second defining layer 320 near the partition groove U relative to the side of the first defining layer 310 near the partition groove U is greater than or equal to 0.05 micrometers, and to ensure that the width of the protrusion of the third defining layer 330 near the partition groove U relative to the side of the first defining layer 310 near the partition groove U is greater than or equal to 0.05 micrometers, so that the concave structure on the sidewall of the partition groove U has a good effect in blocking transverse leakage current, without needing to concern themselves with the morphology of the concave structure on the sidewall of the partition groove U. For example, the following embodiments will illustrate three possible morphologies of the concave structure on the sidewall of the partition groove U based on Figure 12:

[0120] The first possible morphology, as shown in Figure 12, is that the side of the first defining layer 310 near the partition groove U can be an arc-shaped concave surface.

[0121] The second possible morphology is shown in Figure 13. Figure 13 is a partial cross-sectional schematic diagram of another display panel provided in another embodiment of this application. The side of the first defining layer 310 near the partition groove U is an inclined surface X, and the angle between the inclined surface X and the side of the first defining layer 310 facing the third defining layer 330 is an acute angle.

[0122] The third possible morphology is shown in Figure 14. Figure 14 is a partial cross-sectional schematic diagram of another display panel provided in another embodiment of this application. The side of the first defining layer 310 near the partition groove U is a first inclined surface X1 and a second inclined surface X2. The first inclined surface X1 is closer to the driving back plate 100 than the second inclined surface X2. The angle between the first inclined surface X1 and the side of the first defining layer 310 facing the third defining layer 330 is an acute angle. The angle between the second inclined surface X2 and the side of the first defining layer 310 facing the second defining layer 320 is an acute angle.

[0123] It should be noted that the "smoothing treatment" mentioned in the above embodiments for the side of a film layer facing away from the driving backplate refers to processing this side of the film layer facing away from the driving backplate using a chemical mechanical polishing (CMP) process or an etch-back process, thereby making this side of the film layer parallel to the plane of the driving backplate. For example, smoothing the side of the first defining layer facing away from the driving backplate means processing this side of the first defining layer facing away from the driving backplate using a CMP process or an etch-back process.

[0124] It should also be noted that each inorganic insulating layer in the pixel definition layer of this application embodiment needs to be processed individually through a single patterning process. For example, if the pixel definition layer includes a third definition layer, a first definition layer, and a second definition layer stacked together, the third definition layer can be formed first through a patterning process, then the first definition layer can be formed through another patterning process, and finally the second definition layer can be formed through yet another patterning process. Here, a single patterning process may include: photoresist coating, exposure, development, etching, and photoresist stripping.

[0125] In summary, the display panel provided in this application includes: a driving backplane, a first electrode, a pixel definition layer, an organic light-emitting layer, and a second electrode layer. The pixel definition layer may have multiple pixel openings and partition slots, and both the pixel openings and partition slots can sequentially penetrate the second definition layer and the first definition layer within the pixel definition layer. For any given pixel opening, the side of the second definition layer surrounding this pixel opening facing the driving backplane is flush, such that the inscribed height of the partition slots distributed on one side of this pixel opening is the same as the inscribed height of the partition slots distributed on the other side of this pixel opening. Therefore, it can be ensured that the partition slots distributed on one side of any pixel opening have the same isolation effect on the organic light-emitting layer as the partition slots on the other side of this pixel opening. That is, the partition slots distributed around any pixel opening have the same isolation effect on the lateral leakage current generated in the organic light-emitting layer, thereby ensuring a better display effect of the display panel.

[0126] This application also provides a display device. The display device can be any product or component with display functionality, such as AR / VR devices, mobile phones, tablets, televisions, monitors, laptops, digital photo frames, or navigators. The display device can include a driver chip and a display substrate. The display substrate can be a silicon-based OLED display substrate.

[0127] In this embodiment, the display substrate can be the display substrate described in the above embodiments. For example, it can be the display substrate shown in Figures 2 to 14. The display substrate is connected to a driver chip, which provides electrical signals to the display substrate to enable it to display images.

[0128] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0129] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0130] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A display panel, characterized in that, include: The driving backplane (100), the first electrode layer (200), the pixel definition layer (300), the organic light-emitting layer (400), and the second electrode layer (500) are included. The first electrode layer (200) is located on one side of the drive back plate (100). The first electrode layer (200) has a plurality of separately disposed first electrodes (210). The first electrodes (210) are electrically connected to the drive back plate (100). The drive back plate (100) has a groove (O) on the side facing the first electrode layer (200). The groove (O) is distributed between the orthographic projections of two adjacent first electrodes (210) on the drive back plate (100). The groove (O) includes at least two first sub-grooves (O1) and second sub-grooves (O2) distributed in different regions. The depth of the first sub-grooves (O1) is greater than the depth of the second sub-grooves (O2). The pixel definition layer (300) is located on the side of the first electrode layer (200) away from the driving backplate (100). The pixel definition layer (300) includes a first definition layer (310) and a second definition layer (320) stacked in a direction perpendicular to and away from the driving backplate (100). The pixel definition layer (300) has a pixel opening (K) and a partition groove (U) that pass through the second definition layer (320) and the first definition layer (310) in sequence. The organic light-emitting layer (400) is located on the side of the pixel definition layer (300) opposite to the driving backplate (100); The second electrode layer (500) is located on the side of the organic light-emitting layer (400) opposite to the driving backplate (100); The distance between the side of the first defining layer (310) away from the drive back plate (100) and the bottom surface of the first sub-groove (O1) is greater than the distance between the side of the first defining layer (310) away from the drive back plate (100) and the bottom surface of the second sub-groove (O2).

2. The display panel according to claim 1, characterized in that, The first defining layer (310) used to form the pixel opening (K) is flush with the side of the driving backplate (100) facing away from the first defining layer (310), and the side of the first defining layer (310) facing away from the driving backplate (100) is a plane parallel to the driving backplate (100).

3. The display panel according to claim 2, characterized in that, The first defining layer (310) includes: a first part (311) and a second part (312) connected to each other, wherein the orthographic projection of the first part (311) on the drive back plate (100) is located in the area where the groove (O) is located, and the orthographic projection of the second part (312) on the drive back plate (100) is located within the orthographic projection of the first electrode layer (200) on the drive back plate (100); In the direction perpendicular to the drive backplate (100), the thickness of the first part (311) is greater than the thickness of the second part (312).

4. The display panel according to claim 2, characterized in that, The pixel definition layer (300) further includes a third definition layer (330), which is located on the side of the first definition layer (310) facing the driving backplate (100). The pixel opening (K) and the partition groove (U) also penetrate the third definition layer (330). The side of the third definition layer (330) facing away from the driving backplate (100) is a plane parallel to the driving backplate (100). In the direction perpendicular to the driving backplate (100), the thickness of the first definition layer (100) is the same at all positions.

5. The display panel according to claim 4, characterized in that, The third defining layer (330) includes a third part (331) and a fourth part (332) connected to each other. The orthographic projection of the third part (331) on the drive back plate (100) is located in the area where the groove (O) is located. The orthographic projection of the fourth part (332) on the drive back plate (100) is located within the orthographic projection of the first electrode layer (200) on the drive back plate (100). In the direction perpendicular to the drive backplate (100), the thickness of the third part (331) is greater than the thickness of the fourth part (332).

6. The display panel according to any one of claims 1 to 5, characterized in that, The display panel further includes a filling layer (600), which is located on the side of the driving back plate (100) where the first electrode layer (200) is disposed, and is distributed between two adjacent first electrodes (210). The portion of the filling layer (600) facing the driving back plate (100) is located in the groove (O). The maximum distance between the side of the filling layer (600) facing away from the driving back plate (100) and the driving back plate (100) is less than or equal to the distance between the side of the first electrode layer (200) facing away from the driving back plate (100) and the driving back plate (100).

7. The display panel according to claim 6, characterized in that, The drive backplate (100) has an insulating layer (110) on the side facing the first electrode layer (200). The insulating layer (110) has the groove (O) and a plurality of through holes (G) corresponding to the plurality of first electrodes (210). The first electrodes (210) are electrically connected to the drive backplate (100) through the corresponding through holes (G).

8. The display panel according to claim 1, characterized in that, The display panel further includes a filling layer (600), which is located on the side of the driving back plate (100) where the first electrode layer (200) is disposed, and is distributed between two adjacent first electrodes (210). The portion of the filling layer (600) facing the driving back plate (100) is located in the groove (O). The side of the filling layer (600) facing away from the drive backplate (100) is a plane parallel to the drive backplate (100). The distance between the side of the filling layer (600) facing away from the drive backplate (100) and the drive backplate (100) is greater than the distance between the side of the first electrode layer (200) facing away from the drive backplate (100) and the drive backplate (100). The filling layer (600) covers the edge portion of the first electrode (210).

9. The display panel according to claim 8, characterized in that, The orthographic projection of the pixel definition layer (300) on the driving backplate (100) is located within the orthographic projection of the filling layer (600) on the driving backplate (100), and the outer boundary of the orthographic projection of the pixel definition layer (300) on the driving backplate (100) does not coincide with the outer boundary of the orthographic projection of the filling layer (600) on the driving backplate (100).

10. The display panel according to claim 8, characterized in that, The thickness of the first defining layer (310) is the same at all locations in the direction perpendicular to the drive backplate (100).

11. The display panel according to any one of claims 1-5 and 7-10, characterized in that, The thickness is the same at all locations in the second definition layer (320).

12. The display panel according to any one of claims 1-5 and 7-10, characterized in that, The pixel definition layer (300) further includes a third definition layer (330), which is located on the side of the first definition layer (310) facing the driving backplate (100), and the pixel opening (K) and the partition groove (U) also penetrate the third definition layer (330); The third defining layer (330) protrudes outward from the partition groove (U) relative to the side of the first defining layer (310) that is away from the partition groove (U); the side of the first defining layer (310) that is away from the partition groove (U) protrudes outward from the side of the second defining layer (320) that is away from the partition groove (U); or, the side of the first defining layer (310) that is away from the partition groove (U) is flush with the side of the second defining layer (320) that is away from the partition groove (U).

13. The display panel according to any one of claims 1-5 and 7-10, characterized in that, The pixel definition layer (300) further includes a third definition layer (330), which is located on the side of the first definition layer (310) facing the driving backplate (100), and the pixel opening (K) and the partition groove (U) also penetrate the third definition layer (330); The third defining layer (330) protrudes outward from the side of the partition groove (U) relative to the side of the first defining layer (310) near the partition groove (U), and the second defining layer (320) protrudes outward from the side of the partition groove (U) relative to the side of the first defining layer (310) near the partition groove (U).

14. The display panel according to claim 13, characterized in that, The first defining layer (310) includes an arcuate concave surface on the side near the partition groove (U); Alternatively, the side of the first defining layer (310) near the partition groove (U) includes a slope (X), and the angle between the slope (X) and the side of the first defining layer (310) facing the third defining layer (330) is an acute angle; Alternatively, the side of the first defining layer (310) near the partition groove (U) includes a first inclined surface (X1) and a second inclined surface (X2), the first inclined surface (X1) being closer to the drive back plate (100) than the second inclined surface (X2), and the angle between the first inclined surface (X1) and the side of the first defining layer (310) facing the third defining layer (330) being an acute angle, and the angle between the second inclined surface (X2) and the side of the first defining layer (310) facing the second defining layer (320) being an acute angle.

15. A display device, characterized in that, include: A driver chip and a display panel, wherein the display panel is the display panel according to any one of claims 1 to 14, and the driver chip is used to apply a driving signal to the display panel.

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