Display panel and display device

Abstract

The invention discloses a display panel and a display device, and belongs to the technical field of display. The display panel comprises a driving backboard, a first electrode, a pixel definition layer, an organic light-emitting layer and a second electrode layer. Wherein the pixel definition layer can be provided with a plurality of pixel holes and partition grooves, and the pixel holes and the partition grooves can sequentially penetrate through the second definition layer and the first definition layer in the pixel definition layer. According to the organic light-emitting device, any pixel hole is formed, the side, facing the driving back plate, of the second definition layer defining the pixel hole is flush, and it can be guaranteed that the partition effect of the partition grooves distributed in one side of any pixel hole on the organic light-emitting layer is the same as the partition effect of the partition grooves distributed in the other side of the pixel hole on the organic light-emitting layer. In other words, the partition grooves distributed around any pixel opening have the same partition effect on the transverse leakage current generated in the organic light-emitting layer, and therefore it is guaranteed that the display effect of the display panel is good.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] With the development of display technology, display devices are used more and more widely, among which organic light emitting diode (OLED) display panels have attracted more and more attention.

[0003] OLED display panels generally include: a driving backplane, and multiple light-emitting devices located on the driving backplane. Among them, the light-emitting layers in each light-emitting device are uniformly formed by evaporation through an evaporation process, that is, the light-emitting layers in each light-emitting device are connected together. In order to prevent the lateral leakage current generated by the light-emitting layer in a certain light-emitting device from causing the adjacent light-emitting device to emit light during the light-emitting process of the light-emitting device, it is necessary to set a partition groove in the pixel definition layer distributed between adjacent light-emitting devices to isolate the lateral leakage current.

[0004] However, in the same OELD display panel, the isolation grooves arranged in different areas of the pixel definition layer have different isolation effects on the lateral leakage current, resulting in a poor display effect of the display panel. Summary of the invention

[0005] The embodiments of the present application provide a display panel and a display device, which can solve the problem of poor display effect of the OLED display panel in the prior art. The technical solution is as follows:

[0006] In one aspect, a display panel is provided, comprising: a driving backplane, a first electrode layer, a pixel definition layer, an organic light emitting layer, and a second electrode layer;

[0007] The first electrode layer is located at one side of the driving backplane, and the first electrode layer has a plurality of first electrodes that are separately arranged, and the first electrodes are electrically connected to the driving backplane; the driving backplane has a groove on one side facing the first electrode layer, and the groove is distributed between the orthographic projections of two adjacent first electrodes on the driving backplane, and the groove includes at least two first sub-grooves and second sub-grooves distributed in different areas, and the depth of the first sub-groove is greater than the depth of the second sub-groove;

[0008] The pixel definition layer is located on a side of the first electrode layer away from the driving backplane, and 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 backplane, and the pixel definition layer has a pixel opening and a partition groove that sequentially penetrates the second definition layer and the first definition layer;

[0009] The organic light emitting layer is located on a side of the pixel definition layer away from the driving backplane;

[0010] The second electrode layer is located on a side of the organic light emitting layer away from the driving backplane;

[0011] The distance between the side of the first definition layer away from the driving back plate and the bottom surface of the first sub-groove is greater than the distance between the side of the first definition layer away from the driving back plate and the bottom surface of the second sub-groove.

[0012] Optionally, a side of the first definition layer for surrounding the pixel opening facing away from the driving backplane is flush, and a side of the first definition layer facing away from the driving backplane is a plane parallel to the driving backplane.

[0013] Optionally, the first definition layer includes: a first part and a second part connected to each other, the orthographic projection of the first part on the driving backplane is located in the area where the groove is located, and the orthographic projection of the second part on the driving backplane is located within the orthographic projection of the first electrode layer on the driving backplane;

[0014] Wherein, in a direction perpendicular to the driving back plate, the thickness of the first portion is greater than the thickness of the second portion.

[0015] Optionally, the pixel definition layer also includes: a third definition layer, the third definition layer is located on the side of the first definition layer facing the driving backplane, the pixel opening and the partition groove also penetrate the third definition layer, and the side of the third definition layer away from the driving backplane is parallel to the plane of the driving backplane, and in the direction perpendicular to the driving backplane, the thickness at each position in the first definition layer is the same.

[0016] Optionally, the third definition layer includes: a third part and a fourth part connected to each other, the orthographic projection of the third part on the driving backplane is located in the area where the groove is located, and the orthographic projection of the fourth part on the driving backplane is located within the orthographic projection of the first electrode layer on the driving backplane;

[0017] Wherein, in a direction perpendicular to the driving back plate, the thickness of the third portion is greater than the thickness of the fourth portion.

[0018] Optionally, the display panel further includes: a filling layer, the filling layer is located on a side of the driving backplane where the first electrode layer is provided, and is distributed between two adjacent first electrodes, and a portion of the filling layer facing the driving backplane is located in the groove;

[0019] The maximum distance between the driving back plate and a side of the filling layer away from the driving back plate is less than or equal to the distance between the driving back plate and a side of the first electrode layer away from the driving back plate.

[0020] Optionally, the driving backplane has an insulating layer on a 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, and the first electrodes are electrically connected to the driving backplane through the corresponding through holes.

[0021] Optionally, the display panel further includes: a filling layer, the filling layer is located on a side of the driving backplane where the first electrode layer is provided, and is distributed between two adjacent first electrodes, and a portion of the filling layer facing the driving backplane is located in the groove;

[0022] Among them, the side of the filling layer away from the driving backplane is a plane parallel to the driving backplane, the distance between the side of the filling layer away from the driving backplane and the driving backplane is greater than the distance between the side of the first electrode layer away from the driving backplane and the driving backplane, and the filling layer covers the edge portion of the first electrode.

[0023] 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 overlap with the outer boundary of the orthographic projection of the filling layer on the driving backplane.

[0024] Optionally, in a direction perpendicular to the driving backplane, the thickness at each position in the first definition layer is the same.

[0025] Optionally, the thickness at each position in the second definition layer is the same.

[0026] Optionally, the pixel definition layer further includes: a third definition layer, the third definition layer is located on a side of the first definition layer facing the driving backplane, and the pixel opening and the partition groove also penetrate the third definition layer;

[0027] The side of the third definition layer facing away from the partition groove protrudes outward relative to the side of the first definition layer facing away from the partition groove; the side of the first definition layer facing away from the partition groove protrudes outward relative to the side of the second definition layer facing away from the partition groove, or the side of the first definition layer facing away from the partition groove is flush with the side of the second definition layer facing away from the partition groove.

[0028] Optionally, the pixel definition layer further includes: a third definition layer, the third definition layer is located on a side of the first definition layer facing the driving backplane, and the pixel opening and the partition groove also penetrate the third definition layer;

[0029] The side of the third definition layer close to the partition groove protrudes outward relative to the side of the first definition layer close to the partition groove, and the side of the second definition layer close to the partition groove protrudes outward relative to the side of the first definition layer close to the partition groove.

[0030] Optionally, a side of the first definition layer close to the partition groove includes an arc-shaped concave surface;

[0031] Alternatively, a side of the first definition layer close to the partition groove includes an inclined surface, and an angle between the inclined surface and a side of the first definition layer facing the third definition layer is an acute angle;

[0032] Alternatively, the side of the first definition layer close to the partition groove includes a first slope and a second slope, the first slope is closer to the driving back plate than the second slope, and the angle between the first slope and the side of the first definition layer facing the third definition layer is an acute angle, and the angle between the second slope and the side of the first definition layer facing the second definition layer is an acute angle.

[0033] On the other hand, a display device is provided, including: a driving chip and a display panel, the display panel is the above-mentioned display panel, and the driving chip is used to apply a driving signal to the display panel.

[0034] The technical solution provided by the embodiment of the present application has at least the following beneficial effects:

[0035] 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 a plurality of pixel openings and partition grooves, and the pixel openings and the partition grooves may sequentially penetrate the second definition layer and the first definition layer in the pixel definition layer. For any pixel opening, the second definition layer used to enclose the pixel opening is flush with the side facing the driving backplane, so that the inscribed height of the partition grooves distributed on one side of the pixel opening is the same as the inscribed height of the partition grooves distributed on the other side of the pixel opening. To this end, it can be ensured that the partition grooves distributed on one side of any pixel opening have the same partition effect on the organic light-emitting layer as the partition grooves on the other side of the pixel opening. That is, the partition grooves distributed around any pixel opening have the same partition effect on the lateral leakage current generated in the organic light-emitting layer, thereby ensuring a better display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 It is a schematic diagram of a partial structure of a display panel;

[0038] Figure 2 is a top view of a display panel provided in an embodiment of the present application;

[0039] Figure 3 yes Figure 2 A schematic cross-sectional view of a display panel at AA' is shown;

[0040] Figure 4 is a partial cross-sectional schematic diagram of a display panel provided in an embodiment of the present application;

[0041] Figure 5 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of the present application;

[0042] Figure 6 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of the present application;

[0043] Figure 7 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of the present application;

[0044] Figure 8 is a schematic diagram of forming a photoresist on one side of an insulating layer provided by an embodiment of the present application;

[0045] Fig. 9 is a schematic diagram of a patterned photoresist provided in an embodiment of the present application;

[0046] Fig.10 is a schematic diagram of forming a first electrode on one side of a patterned photoresist provided by an embodiment of the present application;

[0047] Fig.11 is a schematic diagram of stripping a patterned photoresist provided in an embodiment of the present application;

[0048] Fig.12 is a partial cross-sectional schematic diagram of a display panel provided by another embodiment of the present application;

[0049] Fig.13 is a partial cross-sectional schematic diagram of another display panel provided by another embodiment of the present application;

[0050] Fig.14It is a partial cross-sectional schematic diagram of yet another display panel provided in another embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0052] In the related art, a silicon-based OLED display panel may include: a driving backplane, and a plurality of light-emitting devices located on the driving backplane. Each light-emitting device includes: a first electrode, a light-emitting layer, and a second electrode. Among them, the light-emitting layer is composed of at least one sub-light-emitting layer. Each sub-light-emitting layer may include: a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer arranged in a stacked manner. In the case where the light-emitting layer is composed of a plurality of stacked sub-light-emitting layers, each sub-light-emitting layer is connected in series through a charge generation layer. In this way, the color of the light emitted by the light-emitting layer is determined by the plurality of sub-light-emitting layers. For example, if the light-emitting layer needs to emit white light, a sub-light-emitting layer capable of emitting red light, a sub-light-emitting layer capable of emitting green light, and a sub-light-emitting layer capable of emitting blue light may be stacked so that the light-emitting layer emits white light. Alternatively, a sub-light-emitting layer capable of emitting yellow light and a sub-light-emitting layer capable of emitting blue light may be stacked so that the light-emitting layer emits white light.

[0053] Wherein, 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 electrode and the second electrode. In this way, the hole injection layer can inject holes into the hole transport layer, and the holes are transmitted to the light-emitting material layer through the hole transport layer. The electron injection layer can inject electrons into the electron transport layer, and the electrons are transmitted to the light-emitting material layer through the electron transport layer. The holes and electrons combine with high-energy excitons in the light-emitting material layer, and the high-energy excitons are unstable and can easily transition to low-energy excitons and release energy. When releasing energy, photons are generated to emit light with a wavelength within a certain range. In the case where the light-emitting layer is composed of multiple sub-light-emitting layers, the charge generation layer is usually made of a material with good conductivity so that each sub-light-emitting layer can emit light, thereby making the light-emitting effect of the light-emitting layer better.

[0054] Since the light-emitting layers in each light-emitting device are uniformly formed by evaporation process, that is, the light-emitting layers in each light-emitting device are connected together. In order to prevent the lateral leakage current generated by the charge generation layer in a light-emitting device from causing the adjacent light-emitting device to emit light during the light-emitting process of a certain light-emitting device, a pixel definition layer is required between adjacent light-emitting devices, and the charge generation layer is isolated by the isolation grooves provided in the pixel definition layer, thereby isolating the lateral leakage current. A filling layer can also be provided on the side of the pixel definition layer close to the driving backplane to reduce the overall step difference of the pixel definition layer.

[0055] In the process of manufacturing the display panel, in order to ensure that two adjacent first electrodes are not connected, it is usually necessary to increase the etching time to completely remove the portion distributed between the two adjacent first electrodes, but this also causes the problem of over-etching. Usually, because the concentration of the etching solution distributed in different areas of the display panel is different, the over-etching depth generated in different areas after the over-etching process is different.

[0056] For this reason, Figure 1 As shown, in the process of forming the first electrode layer 200 in the display panel 000, after the portion between two adjacent first electrodes 210 is overetched, the insulating layer 110 in the driving backplane 100 is also etched to form a groove O on the side of the insulating layer 110 facing the first electrode layer 200. Since the concentrations of the etching solutions distributed in different regions are different during the overetching process, the depths of the grooves O formed on the insulating layer 110 in different regions are different. In this way, after the filling layer 600 is formed between the two adjacent first electrodes 210, the distances between the side of the filling layer 600 in different regions that is away from the driving backplane 100 and the driving backplane 100 are different.

[0057] Generally, in order to ensure that the partition groove U in the pixel definition layer 300 has a certain partition effect, the pixel definition layer 300 can be composed of two or more layers of inorganic insulating layers stacked. In this way, when the distance between the side of the filling layer 600 away from the driving backplane 100 and the driving backplane 100 in different regions is different, the flatness of each inorganic insulating layer in the pixel definition layer 300 away from the driving backplane 100 is poor. In this way, for a certain pixel opening K, the inscribed height h1 of the partition groove U distributed on one side of the pixel opening K is different from the inscribed height h2 of the partition groove U distributed on the other side of the pixel opening K. Since the size of the inscribed height of the partition groove U will directly affect its partition effect on the charge generation layer, therefore, when the inscribed height of the partition groove U at different positions is different, the partition groove U distributed on one side of the pixel opening K will have a different partition effect on the charge generation layer from the partition groove U distributed on the other side of the pixel opening K. Therefore, in the same display panel, the isolation grooves U arranged in different areas of the pixel definition layer 300 have different isolation effects on the lateral leakage current, resulting in a poor display effect of the display panel.

[0058] It should be noted that the inscribed 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 close to the partition groove U and the first electrode 210 .

[0059] In order to solve the above technical problems, the present application provides a display panel. Figure 2and Figure 3 , Figure 2 is a top view of a display panel provided in an embodiment of the present application, Figure 3 yes Figure 2 The cross-sectional view of the display panel at AA′ is shown. The display panel 000 may include: a driving backplane 100 , a first electrode layer 200 , a pixel definition layer 300 , an organic light emitting layer 400 and a second electrode layer 500 .

[0060] The first electrode layer 200 in the display panel 000 is located at one side of the driving backplane 100, and the first electrode layer 200 has a plurality of first electrodes 210 that are separately arranged, and the first electrodes 210 are electrically connected to the driving backplane 100. A groove O is provided on one side of the driving backplane 100 that faces the first electrode layer 200, and the groove O is distributed between the orthographic projections of two adjacent first electrodes 210 on the driving backplane 100, and the groove O includes at least two first sub-grooves O1 and second sub-grooves O2 that are distributed in different areas, and the depth of the first sub-groove O1 is greater than the depth of the second sub-groove O2.

[0061] For example, Figure 3 As shown, due to the different concentrations of the etching solution distributed in different areas during the over-etching process, the depth of the first sub-groove O1 distributed on one side of the first electrode 210 is different from that of the second sub-groove O2 distributed on the other side of the first electrode 210, and the depth d1 of the first sub-groove O1 is greater than the depth d2 of the second sub-groove O2.

[0062] The pixel definition layer 300 in the display panel 000 is located on the side of the first electrode layer 200 away from the driving backplane 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 backplane 100, and the pixel definition layer 300 has a pixel opening K and a partition groove U that sequentially penetrates 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 groove U can be distributed between two adjacent pixel openings K. The multiple pixel openings K correspond one to one to the multiple first electrodes 210. Here, the orthographic projection of each pixel opening K in the pixel definition layer 300 on the driving backplane 100 is located within the orthographic projection of the corresponding first electrode 210 on the driving backplane 100.

[0063] The organic light-emitting layer 400 in the display panel 000 is located on the side of the pixel definition layer 300 away from the driving backplane 100. The organic light-emitting layer 400 can be composed of multiple layers of organic material layers stacked, and these organic material layers can 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 in a direction vertically and away from the driving backplane 100. In the case where the multi-layer organic material layer includes multiple sub-light-emitting layers, each sub-light-emitting layer is connected in series through a charge generation layer. The partition groove U in the pixel definition layer 300 can isolate at least part of the organic material layer in the organic light-emitting layer 400. For example, the partition groove U can isolate the charge generation layer in the organic light-emitting layer 400, and then the lateral leakage current can be isolated. 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 partition groove U.

[0064] The second electrode layer 500 in the display panel 000 is located on a side of the organic light emitting layer 400 away from the driving backplane 100 .

[0065] It should be noted that the portion of the organic light-emitting layer 400 distributed in each pixel opening K may be in contact with the corresponding first electrode 210. In this case, for any pixel opening K, the first electrode 210 corresponding to the pixel opening K, and the portions of the organic light-emitting layer 400 and the second electrode layer 500 distributed in the pixel opening K may constitute a light-emitting device.

[0066] It should also be noted that in order to ensure that the isolation slot U has a better isolation effect on the lateral leakage current, Figure 2 As shown, the partition grooves 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 circle of partition grooves U distributed around the pixel opening K, thereby ensuring that the lateral leakage current generated in any direction during the light-emitting process of a certain light-emitting device will be isolated by the partition grooves U distributed around the light-emitting device.

[0067] It should be noted that both the first definition layer 310 and the second definition layer 320 are inorganic insulating layers. When the depth of the first sub-groove O1 and the depth of the second sub-groove O2 in the groove O are different, the flatness of the side of the first definition layer 310 away from the driving backplane 100 is poor. The present application can process a portion of the film layer located on the side of the second definition layer 320 facing the driving backplane 100 in the display panel, so that the flatness of the side of the first definition layer 310 away from the driving backplane 100 is higher.

[0068] In this case, the distance D1 between the side of the first definition layer 310 away from the driving 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 definition layer 310 away from the driving back plate 100 and the bottom surface of the second sub-groove O2.

[0069] Exemplarily, for any pixel opening K, the first definition layer 310 used to enclose the pixel opening K is flush with the side facing away from the driving backplane 100 , thereby ensuring that the second definition layer 320 used to enclose the pixel opening K is flush with the side facing the driving backplane 100 .

[0070] To more clearly see the shape of the partition groove 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 the present application, Figure 4 The display panel shown does not show the organic light-emitting layer 400 and the second electrode layer 500. For any pixel opening K, when the second definition layer 320 used to surround the pixel opening K is flush with the side facing the driving backplane 100, the inscribed height H1 of the partition groove U distributed on one side of the pixel opening K is the same as the inscribed height H2 of the partition groove U distributed on the other side of the pixel opening K. To this end, it can be ensured that the partition groove U distributed on one side of the pixel opening K has the same effect of isolating the charge generation layer in the organic light-emitting layer 400 as the partition groove 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 effect of isolating the lateral leakage current, thereby ensuring a better display effect of the display panel.

[0071] It should be noted that the second definition layer 320 in the pixel definition layer 300 can be used as the inorganic insulating layer distributed on the outermost side, that is, the second definition layer 320 is the inorganic insulating layer farthest from the driving backplane 100 in the pixel definition layer 300. Therefore, the vertical distance between the portion of the second definition layer 320 distributed close to the partition groove U and the first electrode layer 200 is: the inscribed height of the partition groove U.

[0072] In summary, the display panel provided by the embodiment of the present application includes: a driving backplane, a first electrode, a pixel definition layer, an organic light-emitting layer and a second electrode layer. Among them, the pixel definition layer can have a plurality of pixel openings and partition grooves, and the pixel openings and the partition grooves can sequentially penetrate the second definition layer and the first definition layer in the pixel definition layer. For any pixel opening, the second definition layer used to enclose the pixel opening is flush with the side facing the driving backplane, so that the inscribed height of the partition groove distributed on one side of the pixel opening is the same as the inscribed height of the partition groove distributed on the other side of the pixel opening. To this end, it can be ensured that the partition groove distributed on one side of any pixel opening has the same partition effect on the organic light-emitting layer as the partition groove on the other side of the pixel opening. That is, the partition grooves distributed around any pixel opening have the same partition effect on the lateral leakage current generated in the organic light-emitting layer, thereby ensuring a better display effect of the display panel.

[0073] In this application, if Figure 4 As shown, the side of the first definition layer 310 facing away from the driving backplane 100 is a plane parallel to the driving backplane 100. In this case, the side of the second definition layer 320 facing the driving backplane 100 is also a plane parallel to the driving backplane 100. To this end, the vertical distance between the second definition 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 definition layer 300 at any position is the same, and then the isolation effect of the isolation groove U at any position on the charge generation layer in the organic light-emitting layer 400 can be guaranteed, that is, the isolation effect of the isolation groove U at any position on the lateral leakage current can be guaranteed to be the same. In this way, the display effect of the display panel can be further improved.

[0074] It should be noted that the pixel definition layer 300 in the display panel 000 may include two inorganic insulating layers or three inorganic insulating layers. Of course, it may also include more inorganic insulating layers, which is not limited in the present embodiment.

[0075] Here, in the case where the pixel definition layer 300 includes two inorganic insulating layers, as shown in FIG. Figure 4 As shown, the two inorganic insulating layers may be respectively: a first definition layer 310 and a second definition layer 320. The second definition layer 320 may be located on the side of the first definition layer 310 away from the driving backplane 100, and the partition groove U and the pixel opening K in the pixel definition layer 300 may pass through the second definition layer 320 and the first definition layer 310 in sequence.

[0076] In order to ensure that the partition 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 the lateral leakage current, it is necessary to ensure that the side of the second definition layer 320 close to the partition groove U is protruding outward relative to the side of the first definition layer 310 close to the partition groove U, so that a concave structure can be formed on the inner wall of the partition groove U. In this way, after the organic light-emitting layer 400 is formed by the evaporation process, part of the organic material layer in the organic light-emitting layer 400 can be blocked by the concave structure set on the inner wall of the partition groove U, thereby ensuring that the partition groove U has the ability to block the lateral leakage current.

[0077] In the case where the pixel definition layer 300 includes three inorganic insulating layers, please refer to Figure 5 , Figure 5 3 is a partial cross-sectional schematic diagram of another display panel provided by an embodiment of the present application, wherein the three inorganic insulating layers may be respectively: a first definition layer 310, a second definition layer 320, and a third definition layer 330. The second definition layer 320 may be located on the side of the first definition layer 310 away from the driving backplane 100, and the third definition layer 330 may be located on the side of the first definition layer 310 toward the driving backplane 100, and the partition groove U and the pixel opening K in the pixel definition layer 300 may sequentially penetrate the second definition layer 320, the first definition layer 310, and the third definition layer 330.

[0078] In order 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 the lateral leakage current, it is necessary to ensure that the side of the second definition layer 320 close to the partition groove U is protruding outward relative to the side of the first definition layer 310 close to the partition groove U, and it is necessary to ensure that the side of the third definition layer 330 close to the partition groove U is protruding outward relative to the side of the first definition layer 310 close to the partition groove U, so that a concave structure can be formed on the inner wall of the partition groove U. In this way, after the organic light-emitting layer 400 is formed by the evaporation process, part of the organic material layer in the organic light-emitting layer 400 can be blocked by the concave structure set on the inner wall of the partition groove U, thereby ensuring that the partition groove U has the ability to block the lateral leakage current.

[0079] Optional, such as Figure 4 and Figure 5As shown, each first electrode 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 in a direction perpendicular to and away from the driving backplane 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 backplane 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 by the organic light-emitting layer 400 in the direction toward the driving backplane 100, so that the reflected light can be emitted in the direction away from the driving backplane 100, and the reflected light can produce a coherent effect with the light emitted by the organic light-emitting layer 400 in the direction away from the driving backplane 100, thereby producing a coherently enhanced microcavity effect, and improving the light output rate 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 performance, which is beneficial to improving the electrical performance of the first electrode 210.

[0080] In the present application, the driving backplane 100 has an insulating layer 110 on one side facing the first electrode layer 200. The insulating layer 110 has a plurality of through holes G corresponding to the first electrodes 210 one by one, and the first electrodes 210 are electrically connected to the driving backplane 100 through the corresponding through holes G.

[0081] In the present application, the display panel 000 may further include a filling layer 600. The filling layer 600 may be located on one side of the driving backplane 100 where the first electrode layer 200 is disposed, and distributed between two adjacent first electrodes 210 in the first electrode layer 200, and the portion of the filling layer 600 facing the driving backplane 100 is located in the groove O.

[0082] In this case, the pixel definition layer 300 in the display panel 000 may be distributed on the side of the filling layer 600 away from the driving backplane 100 , and the pixel definition layer 300 may be partially raised to reduce the overall step difference of the pixel definition layer 300 .

[0083] In the embodiment of the present application, the maximum distance between the side of the filling layer 600 away from the driving back plate 100 and the driving back plate 100 may be less than or equal to the distance between the side of the first electrode layer 200 away from the driving back plate 100 and the driving back plate 100. Of course, the maximum distance between the side of the filling layer 600 away from the driving back plate 100 and the driving back plate 100 may also be 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. For different types of filling layers, the embodiment of the present application will be schematically described by taking the following two optional implementation methods as examples.

[0084] In a first 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 less than or equal to the distance between the side of the first electrode layer 200 away from the driving back plate 100 and the driving back plate 100, as shown in FIG. Figure 4 and Figure 5 As shown, due to the over-engraving problem in the process of preparing the first electrode layer 200 in the display panel 100, the side of the distributed insulating layer 110 facing the driving backplane has a groove O, and the depths of the grooves O distributed in different areas are different. Here, the orthographic projection of the groove O of the insulating layer 110 on the driving backplane 100 can be located between the orthographic projections of two adjacent first electrodes 210 on the driving backplane 100. For example, the orthographic projection of the groove O on the driving backplane 100 can surround the periphery of the orthographic projections of each first electrode 210 distributed on the driving backplane 100. In the process of forming 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 in different areas away from the driving backplane 100 and the driving backplane 100 to be different.

[0085] In this case, in order to improve the flatness of the side of the first definition layer 310 in the pixel definition layer 300 away from the driving backplane 100, so that the side of the first definition layer 310 away from the driving backplane 100 is parallel to the plane of the driving backplane 100, the embodiment of the present application proposes the following two improvement schemes:

[0086] The first improvement is to grind the side of the first definition layer 310 in the pixel definition layer 300 away from the driving backplane 100. This improvement can be applied to the pixel definition layer 300 composed of two inorganic insulating layers or the pixel definition layer 300 composed of three inorganic insulating layers.

[0087] Exemplarily, since the first definition layer 310 is an inorganic insulating layer, and the first electrode layer 100 and the filling layer 600 in the display panel 100 have poor flatness on the side facing away from the driving backplane 100, whether the first definition layer 310 is directly formed on the side of the first electrode layer 100 and the filling layer 600 facing away from the driving backplane 100, or the third definition layer 330 is first formed on the side of the first electrode layer 100 and the filling layer 600 facing away from the driving backplane 100, and then the first definition layer 310 is formed on the side of the third definition layer 330 facing away from the driving backplane 100, the first definition layer 310 will have poor flatness on the side facing away from the substrate 100. To this end, after forming the first definition layer 310, the side of the first definition layer 310 facing away from the driving back plate 100 can be polished to improve the flatness of the side of the first definition layer 310 facing away from the driving back plate 100, so that the side of the first definition layer 310 facing away from the driving back plate 100 is a plane parallel to the driving back plate 100.

[0088] In this case, if Figure 4 and Figure 5 As shown, 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 on the driving backplane 100 is located in the region where the groove O is located, and the orthographic projection of the second portion 312 on the driving backplane 100 is located within the orthographic projection of the first electrode layer 200 on the driving backplane 100. Here, in the direction perpendicular to the driving backplane 100, the thickness of the first portion 311 is greater than the thickness of the second portion 312.

[0089] That is, after the side of the first definition layer 310 facing away from the driving back plate 100 is polished, the thickness at different positions in the first definition layer 310 is different. Here, since the distance between the side of the first part 311 in the first definition layer 300 facing the driving back plate 100 and the driving back plate 100 is smaller, the distance between the side of the second part 312 in the first definition layer 310 facing the driving back plate 100 and the driving back plate 100 is larger. Therefore, in the process of polishing the side of the first definition layer 310 facing away from the driving back plate 100, the thickness of the first part 311 in the first definition layer 310 that is polished and removed is smaller, while the thickness of the second part 312 in the first definition layer 310 that is polished and removed is larger. For this reason, after the side of the first definition layer 310 facing away from the driving back plate 100 is polished, the thickness of the first part 311 retained in the first definition layer 310 is greater than the thickness of the second part 312 retained.

[0090] It should be noted that, after the second definition layer 320 is formed on the side of the first definition layer 310 that is ground away from the driving back plate 100, it can be ensured that the side of the second definition layer 320 facing the driving back plate 100 and the side of the second definition layer 320 away from the driving back plate 100 are both planes parallel to the driving back surface 100. Therefore, in the direction perpendicular to the driving back plate 100, the thickness of each position in the second definition layer 320 is the same.

[0091] The second improvement is mainly aimed at the pixel definition layer 300 composed of three inorganic insulating layers. Figure 6 , Figure 6 The third definition layer 330 in the pixel definition layer 300 may be ground flat on one side facing away from the driving backplane 100 , so that the side facing away from the driving backplane 100 is parallel to the plane of the driving backplane 100 .

[0092] In this case, 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 on the driving backplane 100 is located in the region where the groove O is located, and the orthographic projection of the fourth portion 332 on the driving backplane 100 is located within the orthographic projection of the first electrode layer 200 on the driving backplane 100. Here, in the direction perpendicular to the driving backplane 100, the thickness of the third portion 331 is greater than the thickness of the fourth portion 332.

[0093] That is, after the side of the third definition layer 330 facing away from the driving back plate 100 is ground flat, the thickness of different positions in the third definition layer 330 is different. Here, since the distance between the side of the third portion 331 in the third definition layer 330 facing the driving back plate 100 and the driving back plate 100 is smaller, the distance between the side of the fourth portion 332 in the third definition layer 330 facing the driving back plate 100 and the driving back plate 100 is larger. Therefore, in the process of grinding the side of the third definition layer 330 facing away from the driving back plate 100, the thickness of the third portion 331 in the third definition layer 330 that is ground flat and removed is smaller, while the thickness of the fourth portion 332 in the third definition layer 330 that is ground flat and removed is larger. For this reason, after the side of the third definition layer 330 facing away from the driving back plate 100 is ground flat, the thickness of the third portion 331 retained in the third definition layer 330 is greater than the thickness of the fourth portion 332 retained.

[0094] Exemplarily, since the third definition layer 330 is an inorganic insulating layer, and the first electrode layer 100 and the filling layer 600 in the display panel 100 have poor flatness on the side away from the driving backplane 100, directly forming the third definition layer 330 on the side of the first electrode layer 100 and the filling layer 600 away from the driving backplane 100 will result in poor flatness of the third definition layer 330 away from the substrate 100. To this end, after forming the third definition layer 310, the side of the third definition layer 330 away from the driving backplane 100 can be polished to improve the flatness of the side of the third definition layer 330 away from the driving backplane 100, so that the side of the third definition layer 330 away from the driving backplane 100 is parallel to the plane of the driving backplane 100.

[0095] It should be noted that, after the first definition layer 310 is formed on the side of the third definition layer 330 that has been polished away from the driving back plate 100, it can be ensured that the side of the first definition layer 310 facing the driving back plate 100 and the side of the first definition layer 310 away from the driving back plate 100 are both planes parallel to the driving back surface 100. Therefore, in the direction perpendicular to the driving back plate 100, the thickness at each position in the first definition layer 310 is the same.

[0096] Similarly, since the side of the first definition layer 310 facing away from the driving back plate 100 is a plane parallel to the driving back plate 100, after the second definition layer 320 is formed on the side of the first definition layer 310 facing away from the driving back plate 100, it can also be ensured that the side of the second definition layer 320 facing the driving back plate 100 and the side of the second definition layer 320 facing away from the driving back plate 100 are both planes parallel to the driving back plate 100. For this reason, in the direction perpendicular to the driving back plate 100, the thickness at each position in the second definition layer 320 is also the same.

[0097] In a second optional implementation, when the maximum distance between the side of the filling layer 600 away from the driving backplane 100 and the driving backplane 100 is greater than the distance between the side of the first electrode layer 200 away from the driving backplane 100 and the driving backplane 100, please refer to Figure 7 , Figure 7 This is a partial cross-sectional schematic diagram of another display panel provided by an embodiment of the present application. The side of the filling layer 600 facing away from the driving backplane 100 protrudes beyond the side of the first electrode layer 200 facing away from the driving backplane 100 .

[0098] In this case, in order to ensure that the flatness of each inorganic insulating layer in the pixel definition layer 300 formed on the side of the filling layer 600 away from the substrate 100 is good, it is necessary to ensure that the side of the filling layer 600 away from the driving backplane 100 is parallel to the plane of the driving backplane 100, and it is necessary to ensure that the orthographic projection of the pixel definition layer 300 on the driving backplane 100 is located within the orthographic projection of the filling layer 600 on the driving backplane 100. In this way, after each inorganic insulating layer in the pixel definition layer 300 is formed on the side of the filling layer 600 away from the substrate 100, it can be ensured that the side of these inorganic insulating layers facing the driving backplane 100 and the side away from the driving backplane 100 are both parallel to the plane of the driving backplane 100. That is, in the direction perpendicular to the driving backplane 100, the thickness of each position in any inorganic insulating layer in the pixel definition layer 300 is the same.

[0099] It should be noted that, under normal circumstances, the pixel definition layer 300 needs to cover the edge portions of each first electrode 210 in the first electrode layer 200 to prevent the etching marks generated on the edge of the first electrode 210 after etching from interfering with the normal light emission of the light-emitting device 200. However, when the side of the filling layer 600 away from the driving backplane 100 protrudes from the side of the first electrode layer 200 away from the driving backplane 100, and the orthographic projection of the pixel definition layer 300 on the driving backplane 100 is located within the orthographic projection of the filling layer 600 on the driving backplane 100, the pixel definition layer 300 will not cover the edge portions of each first electrode 210. For this reason, it is necessary to use the filling layer 600 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.

[0100] It should also be noted that, when the side of the filling layer 600 facing away from the driving backplane 100 protrudes beyond the side of the first electrode layer 200 facing away from the driving backplane 100, there are multiple design methods for making the side of the filling layer 600 facing away from the driving backplane 100 a plane parallel to the driving backplane 100. The present application embodiment takes the following two design methods as examples for description:

[0101] In a first design method, the side of the filling layer 600 facing away from the driving back plate 100 is directly ground flat.

[0102] For example, Figure 7 As shown, due to the over-etching problem in the process of preparing the first electrode layer 200 in the display panel 100, the insulating layer 110 in the display panel 000 has a groove O on one side facing the first electrode layer 200. A portion of the filling layer 600 in the display panel 000 may be located in the groove O. Here, the orthographic projection of the groove O of the insulating layer 110 on the driving backplane 100 may be located between the orthographic projections of two adjacent first electrodes 210 on the driving backplane 100. For example, the orthographic projection of the groove O on the driving backplane 100 may surround the periphery of the orthographic projections of each first electrode 210 on the driving backplane 100.

[0103] In addition, since the concentration of the etching solution distributed in different regions is different during the over-etching process, the depths of the grooves O formed on the insulating layer 110 in different regions are different. In this case, in order to ensure that the side of the filling layer 600 away from the driving backplane 100 is parallel to the plane of the driving backplane 100, the thickness of the filling layer 600 can be thickened, that is, it is necessary to ensure that the side of the formed filling layer 600 away from the driving backplane 100 protrudes from the side of the first electrode layer 200 away from the driving backplane. The portion of the filling layer 600 protruding from the first electrode layer 200 can be polished so that the side of the filling layer 600 away from the driving backplane 100 is parallel to the plane of the driving backplane 100.

[0104] The second design method is to improve the preparation 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 the groove O. Under this premise, the side of the filling layer 600 facing away from the driving backplane 100 is polished.

[0105] For example, Figure 8 As shown in FIG. 1 , a photoresist film 700a is first coated on one side of the insulating layer 110. Then, as shown in FIG. Fig. 9 As shown, 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 backplane 100 can surround the periphery of the orthographic projection of each light-emitting device formed subsequently on the driving backplane. Fig.10 As shown, a metal conductive film 200a is formed on the side of the photoresist pattern 700b away from the driving backplane 100. Here, a portion of the metal conductive film 200a is located on the side of the photoresist pattern 700b away from the driving backplane 100, and the orthographic projection of the other portion of the metal conductive film 200a on the driving backplane 100 does not overlap with the orthographic projection of the photoresist pattern 700a on the driving backplane 100. Finally, as Fig.11 As shown, the photoresist pattern 700b is stripped, and at this time, the portion of the metal conductive film 200a located on the side of the photoresist pattern 700b away from the driving backplane 100 will be stripped along with the photoresist pattern 800b, so that the portion of the metal conductive film 200a that does not overlap with the photoresist pattern 700a can be retained, and finally the first electrode layer 200 is formed. In this case, there is no need to use a solution for over-engraving the first electrode layer 200, so that the side of the insulating layer 110 facing the first electrode 210 will no longer form the groove O, that is, the side of the insulating layer 110 facing the first electrode 210 can be a plane parallel to the driving backplane 100. In this way, the flatness of the film layer formed subsequently can be effectively improved.

[0106] In adopting Figures 8 to 12The process flow shown in FIG. 1 is used to prepare the first electrode layer 200, and after the filling layer 600 and the pixel definition layer 300 are subsequently formed, the process flow can be referred to as follows. Fig.12 The display panel shown. Fig.12 As shown, Fig.12 1 is a partial cross-sectional schematic diagram of a display panel provided by another embodiment of the present application. Since the groove O is no longer formed on the side of the insulating layer 110 facing the first electrode layer 200, the flatness of the filling layer 600 formed on the driving backplane 100 is relatively high. In this way, in the process of grinding the side of the filling layer 600 away from the driving backplane 100, the thickness of the part of the filling layer 600 that is ground and removed can be relatively small, thereby simplifying the difficulty of grinding the filling layer 600.

[0107] It should be noted that the above embodiments list a variety of possible implementations of the display panel 000. Figure 6 and Figure 7 Based on this, other features of the pixel definition layer 300 in the display panel 000 are described as follows:

[0108] 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 less than or equal to the distance between the side of the first electrode layer 200 away from the driving back plate 100 and the driving back plate 100, as shown in FIG. Figure 6 As shown, the third definition layer 330 in the pixel definition layer 300 may cover edge portions of each first electrode 210 in the first electrode layer 200 .

[0109] In the pixel definition layer 300, the side of the third definition layer 330 away from the partition groove U protrudes outward relative to the side of the first definition layer 310 away from the partition groove U, and the side of the first definition layer 310 away from the partition groove U protrudes outward relative to the side of the second definition layer 320 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 may be sequentially connected and arranged in a direction away from the driving backplane 100. For this purpose, 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 in the pixel opening K decrease in sequence.

[0110] In this case, the pixel opening K in the pixel definition layer 300 is a stepped opening. In this way, after the organic light-emitting layer 400 and the second electrode layer 500 are subsequently formed on the side of the pixel definition layer 300 away from the driving backplane 100, it can be ensured that the portion of the organic light-emitting layer 400 and the second electrode layer 500 distributed in the pixel opening K is relatively flat, so as to ensure that the overall step difference of the portion of the organic light-emitting layer 400 and the second electrode layer 500 distributed in the pixel opening K is relatively small, thereby making the thickness of the portion of the organic light-emitting layer 400 located in the central area of ​​the pixel opening K approximately equal to the thickness located in the peripheral area of ​​the pixel opening K. In this way, the uniformity of light emission of each light-emitting device in the display panel 000 can be ensured to be high.

[0111] In addition, since the size of the third sub-opening closest to the driving backplane 100 in the pixel definition layer 300 is the smallest, and the third sub-opening runs through the third definition layer 330. Therefore, for the same type of light-emitting devices, it is only necessary to make the third definition layer 330 cover the same width of each first electrode 210 in the same type of light-emitting devices, so that the size of the third sub-opening in each pixel opening K corresponding to the same type of light-emitting devices can be the same, and then the light-emitting area of ​​the organic light-emitting layer 400 in the same type of light-emitting devices can be the same, which effectively improves the uniformity of light emission of the same type of light-emitting devices. Here, the same type of light-emitting devices refers to: light-emitting devices that can emit light of the same color.

[0112] In the case where 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, as shown in FIG. Figure 7 As shown, 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 cover the edge portions of each first electrode 210 in the first electrode layer 200 separately. For this reason, the orthographic projection of the pixel definition layer 300 on the driving backplane 100 may not overlap with the orthographic projection of the filling layer 600 on the driving backplane 100. That is, the side of the filling layer 600 facing the pixel opening K may protrude outward relative to the side of the pixel definition layer 300 facing the pixel opening K.

[0113] In this case, for the same type of light-emitting devices, it is only necessary to make the filling layer 600 cover the same width of each first electrode 210 in the same type of light-emitting devices, so that the light-emitting area of ​​the organic light-emitting layer 400 in the same type of light-emitting devices can be the same, which effectively improves the uniformity of light emission of the same type of light-emitting devices. Here, the same type of light-emitting devices refers to: light-emitting devices that can emit light of the same color.

[0114] In the pixel definition layer 300, the side of the third definition layer 330 away from the partition groove U protrudes outward relative to the side of the first definition layer 310 away from the partition groove U, and the side of the first definition layer 310 away from the partition groove U protrudes outward relative to the side of the second definition layer 320 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 protrude outward relative to the side of the third definition layer 330 facing the pixel opening K. 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, a third sub-opening for penetrating the third definition layer 330, and a fourth sub-opening for penetrating the filling layer 600. And the fourth sub-opening, the third sub-opening, the second sub-opening and the first sub-opening in the pixel opening K can be sequentially connected and arranged in a direction away from the driving backplane 100. For this reason, 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; 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-opening, the second sub-opening, the third sub-opening and the fourth sub-opening in the pixel opening K are sequentially reduced.

[0115] In this case, the pixel opening K in the pixel definition layer 300 is a stepped opening. In this way, after the organic light-emitting layer 400 and the second electrode layer 500 are subsequently formed on the side of the pixel definition layer 300 away from the driving backplane 100, it can be ensured that the portion of the organic light-emitting layer 400 and the second electrode layer 500 distributed in the pixel opening K is relatively flat, so as to ensure that the overall step difference of the portion of the organic light-emitting layer 400 and the second electrode layer 500 distributed in the pixel opening K is relatively small, thereby making the thickness of the portion of the organic light-emitting layer 400 located in the central area of ​​the pixel opening K approximately equal to the thickness located in the peripheral area of ​​the pixel opening K. In this way, the uniformity of light emission of each light-emitting device in the display panel 000 can be ensured to be high.

[0116] It should be noted that, in other possible implementations, the side of the first definition layer 310 away from the partition groove U may also be flush with the side of the second definition layer 320 away from the partition groove U, and it is only necessary to ensure that the side of the third definition layer 330 away from the partition groove U is protruding outward relative to the side of the first definition layer 310 away from the partition groove U. This embodiment of the application is not limited to this.

[0117] In the embodiment of the present application, a concave structure needs to be formed on the side wall of the partition groove U so that the partition groove U has the ability to block the lateral leakage current, and in order to ensure that the partition groove U has a good ability to block the lateral leakage current, it is necessary to limit the lateral size of the concave structure on the side wall of the partition groove U. Here, the width of the side of the second definition layer 320 close to the partition groove U relative to the side of the first definition layer 310 close to the partition groove U needs to be greater than or equal to 0.05 microns, and the width of the side of the third definition layer 330 close to the partition groove U relative to the side of the first definition layer 310 close to the partition groove U needs to be greater than or equal to 0.05 microns.

[0118] It should be noted that the embodiment of the present application only needs to ensure that the width of the side of the second definition layer 320 close to the partition groove U relative to the side of the first definition layer 310 close to the partition groove U is greater than or equal to 0.05 microns, and that the width of the side of the third definition layer 330 close to the partition groove U relative to the side of the first definition layer 310 close to the partition groove U is greater than or equal to 0.05 microns, so that the concave structure on the side wall of the partition groove U has a good effect of isolating the lateral leakage current, without having to worry about the morphology of the concave structure on the side wall of the partition groove U. For example, the following embodiments will be described in detail. Fig.12 Based on this, three possible morphologies of the concave structure on the side wall of the partition groove U are described:

[0119] The first possible morphology is Fig.12 As shown, the side of the first definition layer 310 close to the partition groove U may be an arc-shaped concave surface.

[0120] The second possible morphology is Fig.13 As shown, Fig.13 It is a partial cross-sectional schematic diagram of another display panel provided by another embodiment of the present application. The side of the first definition layer 310 close to the partition groove U is an inclined surface X, and the angle between the inclined surface X and the side of the first definition layer 310 facing the third definition layer 330 is an acute angle.

[0121] The third possible morphology is Fig.14 As shown, Fig.14 It is a partial cross-sectional schematic diagram of another display panel provided by another embodiment of the present application, wherein the side of the first definition layer 310 close to the partition groove U is a first inclined plane X1 and a second inclined plane X2, the first inclined plane X1 is closer to the driving backplane 100 than the second inclined plane X2, and the angle between the first inclined plane X1 and a side of the first definition layer 310 facing the third definition layer 330 is an acute angle, and the angle between the second inclined plane X2 and a side of the first definition layer 310 facing the second definition layer 320 is an acute angle.

[0122] It should be noted that the grinding process for the side of a certain film layer away from the driving backplane mentioned in the above embodiment means: using a chemical mechanical grinding process or a back-etching process to process the side of the film layer away from the driving backplane, that is, the side of the film layer away from the driving backplane is processed into a plane parallel to the driving backplane. Exemplarily, grinding the side of the first definition layer away from the driving backplane means: using a chemical mechanical grinding process or a back-etching process to process the side of the first definition layer away from the driving backplane.

[0123] It should also be noted that each inorganic insulating layer in the pixel definition layer in the embodiment of the present application needs to be processed by a single patterning process. For example, in the case where the pixel definition layer includes a third definition layer, a first definition layer, and a second definition layer arranged in a stacked manner, the third definition layer can be formed by a single patterning process, and then the first definition layer can be formed by another patterning process, and finally the second definition layer can be formed by another patterning process. Here, a single patterning process may include: photoresist coating, exposure, development, etching, and photoresist stripping.

[0124] In summary, the display panel provided by the embodiment of the present application includes: a driving backplane, a first electrode, a pixel definition layer, an organic light-emitting layer and a second electrode layer. Among them, the pixel definition layer can have a plurality of pixel openings and partition grooves, and the pixel openings and the partition grooves can sequentially penetrate the second definition layer and the first definition layer in the pixel definition layer. For any pixel opening, the second definition layer used to enclose the pixel opening is flush with the side facing the driving backplane, so that the inscribed height of the partition groove distributed on one side of the pixel opening is the same as the inscribed height of the partition groove distributed on the other side of the pixel opening. To this end, it can be ensured that the partition groove distributed on one side of any pixel opening has the same partition effect on the organic light-emitting layer as the partition groove on the other side of the pixel opening. That is, the partition grooves distributed around any pixel opening have the same partition effect on the lateral leakage current generated in the organic light-emitting layer, thereby ensuring a better display effect of the display panel.

[0125] The embodiment of the present application also provides a display device. The display device can be any product or component with a display function, such as AR, VR, mobile phone, tablet computer, television, monitor, notebook computer, digital photo frame, navigator, etc. The display device can include a driver chip and a display substrate. The display substrate can be a silicon-based OELD display substrate.

[0126] In the embodiment of the present application, the display substrate may be the display substrate in the above embodiment. Figures 2 to 14 The display substrate is shown. The display substrate is connected to a driving chip, and the driving chip provides an electrical signal to the display substrate so that the display substrate can display an image.

[0127] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it is understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0128] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0129] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

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

3. The display panel according to claim 2, characterized in that: The first definition layer (310) comprises: a first part (311) and a second part (312) connected to each other, wherein an orthographic projection of the first part (311) on the driving back plate (100) is located within the region where the groove (O) is located, and an orthographic projection of the second part (312) on the driving back plate (100) is located within an orthographic projection of the first electrode layer (200) on the driving back plate (100); Wherein, in a direction perpendicular to the driving back plate (100), the thickness of the first portion (311) is greater than the thickness of the second portion (312).

4. The display panel according to claim 2, characterized in that: The pixel definition layer (300) further comprises: a third definition layer (330), the third definition layer (330) being located on a side of the first definition layer (310) facing the driving backplane (100), the pixel opening (K) and the partition groove (U) also passing through the third definition layer (330), and a side of the third definition layer (330) facing away from the driving backplane (100) is a plane parallel to the driving backplane (100), and in a direction perpendicular to the driving backplane (100), the thickness at each position in the first definition layer (100) is the same.

5. The display panel according to claim 4, characterized in that: The third definition layer (330) comprises: a third part (331) and a fourth part (332) connected to each other, the orthographic projection of the third part (331) on the driving back plate (100) being located within the region where the groove (O) is located, and the orthographic projection of the fourth part (332) on the driving back plate (100) being located within the orthographic projection of the first electrode layer (200) on the driving back plate (100); Wherein, in a direction perpendicular to the driving back plate (100), the thickness of the third portion (331) is greater than the thickness of the fourth portion (332).

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

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

8. The display panel according to claim 1, characterized in that: The display panel further comprises: a filling layer (600), the filling layer (600) being located on a side of the driving backplane (100) where the first electrode layer (200) is arranged, and being distributed between two adjacent first electrodes (210), and a portion of the filling layer (600) facing the driving backplane (100) being located in the groove (O); The side of the filling layer (600) facing away from the driving backplane (100) is a plane parallel to the driving backplane (100), the distance between the side of the filling layer (600) facing away from the driving backplane (100) and the driving backplane (100) is greater than the distance between the side of the first electrode layer (200) facing away from the driving backplane (100) and the driving backplane (100), and the filling layer (600) covers an 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 backplane (100) is located within the orthographic projection of the filling layer (600) on the driving backplane (100), and the outer boundary of the orthographic projection of the pixel definition layer (300) on the driving backplane (100) does not overlap with the outer boundary of the orthographic projection of the filling layer (600) on the driving backplane (100).

10. The display panel according to claim 8, characterized in that: In a direction perpendicular to the driving back plate (100), the thickness of each position in the first definition layer (310) is the same.

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

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

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

14. The display panel according to claim 13, characterized in that: The first definition layer (310) comprises an arc-shaped concave surface on one side close to the partition groove (U); Alternatively, a side of the first definition layer (310) close to the partition groove (U) includes an inclined surface (X), and an angle between the inclined surface (X) and a side of the first definition layer (310) facing the third definition layer (330) is an acute angle; Alternatively, a side of the first definition layer (310) close to the partition groove (U) includes 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), and an angle between the first inclined surface (X1) and a side of the first definition layer (310) facing the third definition layer (330) is an acute angle, and an angle between the second inclined surface (X2) and a side of the first definition layer (310) facing the second definition layer (320) is an acute angle.

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

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