Display panel, preparation method thereof and display device

Abstract

The invention relates to a display panel, a preparation method thereof and a display device. The display panel comprises a substrate; the plurality of first electrodes are positioned on one side of the substrate; the pixel definition layer is located on the side, away from the substrate, of the first electrode; the pixel definition layer comprises a main body part, first grooves and second grooves, the first grooves penetrate through the pixel definition layer and expose the first electrodes, the main body part is located between every two adjacent first grooves, and the second grooves are located in the side, away from the substrate, of the main body part; an included angle is formed between the bottom face of the main body part and the first side face close to the first groove, and the included angle is smaller than or equal to 40 degrees. According to the technical scheme, the inclination angle, close to the first groove side, of the pixel definition layer is small, shielding of large-angle emergent light is reduced, and the problem of color cast can be solved.

Description

Technical Field

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

[0002] With the continuous development of display technology, display panels have been widely used in people's production and life. However, there are still some problems to be solved in display panels in related technologies, such as display color cast. Summary of the invention

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a display panel and a method for manufacturing the same, and a display device.

[0004] The present disclosure provides a display panel, comprising:

[0005] substrate substrate;

[0006] A plurality of first electrodes are located on one side of the substrate;

[0007] A pixel definition layer is located on a side of the first electrode away from the substrate; the pixel definition layer comprises a main body, a first groove and a second groove, the first groove penetrates the pixel definition layer and exposes the first electrode, the main body is located between two adjacent first grooves, and the second groove is located on a side of the main body away from the substrate;

[0008] There is an angle between the bottom surface of the main body and the first side surface of the main body close to the first groove, and the angle is less than or equal to 40 degrees.

[0009] The present disclosure provides a method for preparing a display panel, comprising:

[0010] providing a substrate base plate;

[0011] forming a plurality of first electrodes on one side of the base substrate;

[0012] forming a pixel definition layer on a side of the first electrode away from the base substrate;

[0013] Performing patterning on the pixel definition layer to form a main body, a first groove and a second groove;

[0014] Among them, the first groove penetrates the pixel definition layer and exposes the first electrode, the main body is located between two adjacent first grooves, and the second groove is located on the side of the main body away from the base substrate; there is an angle between the bottom surface of the main body and the first side surface of the main body close to the first groove, and the angle is less than or equal to 40 degrees.

[0015] The present disclosure provides a display device, comprising the above-mentioned display panel.

[0016] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0017] The display panel provided by the present disclosure includes a substrate, a plurality of first electrodes and a pixel definition layer, wherein the plurality of first electrodes are located on one side of the substrate and the edge, the pixel definition layer is located on the side of the first electrode away from the substrate, and the pixel definition layer includes a main body, a first groove and a second groove, the first groove runs through the pixel definition layer and exposes the first electrode, the main body is located between two adjacent first grooves, and the second groove is located on the side of the main body away from the substrate; wherein an angle is formed between the bottom surface of the main body and the first side surface close to the first groove, and the angle is less than or equal to 40 degrees. Thus, by setting the main body of the pixel definition layer to have a smaller inclination angle on the side close to the first groove, the main body can reduce the shielding of large-angle outgoing light, so that more large-angle light can be emitted from the display panel, thereby improving the color cast problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 A schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure;

[0021] Figure 2 For along Figure 1 A schematic diagram of a cross-sectional structure of A1-A2;

[0022] Figure 3 For along Figure 1 Another cross-sectional structural diagram of A1-A2;

[0023] Figure 4 An enlarged schematic diagram of a local film layer in a display panel provided by an embodiment of the present disclosure;

[0024] Figure 5 A structural schematic diagram of a display panel provided for related technology;

[0025] Figure 6 A structural schematic diagram of another display panel provided for related technology;

[0026] Figure 7 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0027] Figure 8 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0028] Fig. 9 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0029] Fig.10 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0030] Fig.11 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0031] Fig.12 For along Fig.11 A schematic diagram of a cross-sectional structure of A3-A4;

[0032] Fig.13 A schematic cross-sectional structure diagram of another display panel provided in an embodiment of the present disclosure;

[0033] Fig.14 A schematic diagram of a process for preparing a display panel provided in an embodiment of the present disclosure;

[0034] Fig.15 for Fig.14 A schematic structural diagram of a substrate provided in S210 in the preparation method shown;

[0035] Fig.16 for Fig.14 A schematic diagram of the structure formed by S220 in the preparation method shown;

[0036] Fig.17 for Fig.14 A schematic diagram of the structure formed by S230 in the preparation method shown;

[0037] Fig.18 for Fig.14 A schematic diagram of the structure formed by S240 in the preparation method shown;

[0038] Fig.19 for Fig.14 A schematic flow chart of the detailed steps of S240 in the preparation method shown;

[0039] Fig. 20 for Fig.19 A schematic diagram of the structure formed by S241 in the step flow shown;

[0040] Fig.21 for Fig.19 A schematic diagram of a detailed step flow of S241 in the step flow shown;

[0041] Fig. 22 A schematic structural diagram of a half-tone mask provided in an embodiment of the present disclosure;

[0042] Fig.23 A schematic diagram of the alignment of a half-tone mask and a base substrate provided in an embodiment of the present disclosure;

[0043] Fig.24 for Fig.21 A schematic diagram of a detailed step flow of S2411 in the step flow shown;

[0044] Fig.25 A schematic diagram of the structure of a display device provided in an embodiment of the present disclosure.

[0045] Among them, 10, display panel; 100, base substrate; 110, first electrode; 120, pixel definition layer; 121, main body; 122, first groove; 123, second groove; 1211, bottom surface; 1212, first side surface; A0, angle; 130, sub-pixel; 131, first color sub-pixel; 132, second color sub-pixel; 12121, first A side surface; 12122, first B side surface; 140, first light-emitting layer; 150, charge generation layer; 151, first carrier layer; 152, second carrier layer; 153, third carrier layer; 154, fourth carrier layer; 160, second light-emitting layer; 170, second electrode; 30, display device. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0048] In an organic light-emitting display panel, in order to enhance the migration and recombination efficiency of carriers, functional film layers such as an electron transport layer, an electron injection layer, a hole transport layer, and a hole injection layer are usually arranged between the electrode and the actual light-emitting layer of the organic light-emitting device. However, since these functional film layers are usually the entire surface structure covering all organic light-emitting devices in the display panel, that is, these functional film layers are common layers of each organic light-emitting device, this results in that when the display panel is displaying, in addition to the normal process of carriers corresponding to different organic light-emitting devices migrating longitudinally from their respective cathodes and / or anodes to the corresponding light-emitting layers, there will also be a situation where carriers migrate laterally between different organic light-emitting devices through the above-mentioned functional film layers, that is, lateral leakage occurs, resulting in the problem of mutual crosstalk between different sub-pixels when the display panel is displaying. In order to solve the problem of lateral leakage, a trench can be arranged between adjacent organic light-emitting devices to extend the leakage path. The inventor has found through research that in a display panel using a trench structure, visual effects such as color cast are prone to occur.

[0049] To this end, an embodiment of the present disclosure provides a display panel, which includes a base substrate, a plurality of first electrodes located on one side of the base substrate, and a pixel definition layer located on a side of the first electrode away from the base substrate; wherein the pixel definition layer includes a main body, a first groove and a second groove, the first groove penetrates the pixel definition layer and exposes the first electrode, and the first groove is used as an opening area; the main body is located between two adjacent first grooves, and the second groove is located on a side of the main body away from the base substrate, for extending the leakage path to improve the leakage; an angle is formed between the bottom surface of the main body and the first side surface close to the first groove, and the angle is less than or equal to 40 degrees, thereby the inclination angle of the pixel definition layer in the opening area is smaller, which can reduce the shielding of the main body to large-angle emitted light, so that more large-angle light can be emitted from the display panel, thereby improving the color cast problem.

[0050] The display panel, the method for manufacturing the display panel, and the display device provided in the embodiments of the present disclosure are exemplarily described below with reference to the accompanying drawings.

[0051] For example, Figure 1 A schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure is shown in FIG. Figure 2 For along Figure 1 A schematic diagram of a cross-sectional structure of A1-A2, Figure 3 For along Figure 1 Another cross-sectional structure diagram of A1-A2, Figure 4 The present invention provides a display panel provided by the embodiment of the present invention. The display panel includes a base substrate, a first electrode and a pixel definition layer. Figure 1 and Figure 4, the display panel 10 may include: a substrate 100; a plurality of first electrodes 110, located on one side of the substrate 100; a pixel definition layer 120, located on the side of the first electrode 110 away from the substrate 100; the pixel definition layer 120 includes a main body 121, a first groove 122 and a second groove 123, the first groove 122 penetrates the pixel definition layer 120 and exposes the first electrode 110, the main body 121 is located between two adjacent first grooves 122, and the second groove 123 is located on the side of the main body 121 away from the substrate 100; wherein, an angle A0 is formed between a bottom surface 1211 of the main body 121 and a first side surface 1212 of the main body 121 close to the first groove 122, and the angle A0 is less than or equal to 40 degrees, that is, A0≤40 degrees. The angle A0 is toward the main body 121.

[0052] The base substrate 100 is used to support the functional film layer located thereon, and the functional film layer may include a driving circuit layer, a light-emitting element layer, and other auxiliary film layers known to those skilled in the art, which are not described or limited herein. In some implementations, the base substrate 100 may also be a driving circuit substrate, that is, the base substrate 100 may be a substrate on which a driving circuit layer has been formed, and the functional film layer located thereon may include a light-emitting element layer and other auxiliary film layers, which are not limited herein.

[0053] Exemplarily, the base substrate 100 may be a rigid substrate or a flexible substrate; wherein the rigid substrate may include a glass substrate or other non-bendable / curled substrate, and the flexible substrate may include a stainless steel substrate, a polyimide (PI) substrate or other bendable / curled substrate, which is not limited here.

[0054] The display panel 10 further includes a first electrode 110, which is located on one side of the base substrate 100, and the number of the first electrodes 110 is multiple. Figure 1 For example, the number of first electrodes 110 in the display panel 10 is 4, but this does not constitute a limitation on the display panel 10 provided in the embodiment of the present disclosure. In the display panel 10, the number of first electrodes 110 is usually large, and the embodiment of the present disclosure does not limit the specific number of first electrodes 110 in the display panel 10.

[0055] The first electrode 110 is an electrode structure of a light-emitting element (not shown in the figure) in the display panel 10. Exemplarily, in the display panel 10, the light-emitting element includes an organic light-emitting diode (OLED), and the first electrode 110 can be an anode or other pixel electrode, such as a cathode, which is not limited here.

[0056] Exemplarily, the display panel 10 may include a pixel circuit on one side of the base substrate 100, and the pixel circuit is electrically connected to the first electrode 110. The pixel circuit may include structures such as an active layer, a gate, a source and a drain, and include a multi-layer insulating layer stacked between the base substrate 100 and the first electrode 110, such as a buffer layer, a gate insulating layer, an interlayer insulating layer and a planarization layer. The type and position of the insulating layer can be set based on the type and number of specific pixel circuits, which is not limited in the embodiments of the present disclosure.

[0057] The display panel 10 further includes a pixel definition layer 120, which can define the light-emitting area of ​​the sub-pixel. Exemplarily, the pixel definition layer 120 includes a main body 121 and a first groove 122, wherein the main body 121 is located between two adjacent first grooves 122, and is used to define the first groove 122, wherein the first groove 122 penetrates the pixel definition layer 120 and exposes at least a portion of the first electrode 110, wherein the first electrode 110 is connected to a common layer (such as the hole injection layer in this article) at the first groove 122, and the display panel may further include functional film layers such as an electron transport layer, an electron injection layer, a hole transport layer, and a hole injection layer, which will be described in conjunction with the following text. Figure 2 and Figure 3 The common layer and the light emitting structure of the display panel are exemplarily described) to achieve light emission and display of the light emitting element at the first groove 122. Among them, the different sizes of the first groove 122 can limit the exposed size of the first electrode 110, and further determine the size of the light emitting area of ​​the light emitting element including the first electrode 110. The embodiment of the present disclosure does not limit the size and size of the first groove 122.

[0058] In some implementations, reference Figure 2 , which shows a display panel with a single-layer light-emitting structure. The display panel 10 may further include a first light-emitting layer 140 and a second electrode 170, wherein the first light-emitting layer 140 is located on a side of the first electrode 110 away from the base substrate 100, and the second electrode 170 is located on a side of the first light-emitting layer 140 away from the first electrode 110, that is, the first light-emitting layer 140 is located between the first electrode 110 and the second electrode 170, and can emit light based on the potential difference between the first electrode 110 and the second electrode 170.

[0059] For example, continue to refer to Figure 2, the display panel 10 may further include a first carrier layer 151 and a second carrier layer 152; the first carrier layer 151 is located between the first light-emitting layer 140 and the first electrode 110, and the second carrier layer 152 is located between the first light-emitting layer 140 and the second electrode 170. Exemplarily, the first electrode 110 may be an anode, the second electrode 170 may be a cathode, the first carrier layer 151 may include an electron injection layer and / or an electron transport layer, and the second carrier layer 152 may include a hole injection layer and / or a hole transport layer, which is not limited here. Among them, the first carrier layer 151 and the second carrier layer 152 may be a common layer and deposited in the second groove 123 to extend the leakage path and improve the leakage. Exemplarily, the common layer can be prepared using a common mask.

[0060] In the display panel 10 , by configuring the sub-pixel 130 to include a single-layer first light-emitting layer 140 , the film structure of the display panel 10 can be kept simple and easy to process while meeting actual needs.

[0061] In some implementations, reference Figure 3 , which shows a display panel with a stacked light-emitting structure. The display panel 10 may also include: a first light-emitting layer 140, located on a side of the first electrode 110 away from the base substrate 100; a charge generation layer 150, located on a side of the first light-emitting layer 140 away from the first electrode 110; a second light-emitting layer 160, located on a side of the charge generation layer 150 away from the first light-emitting layer 140; and a second electrode 170, located on a side of the second light-emitting layer 160 away from the charge generation layer 150.

[0062] The display panel 10 includes a first light-emitting layer 140 and a second light-emitting layer 160, wherein the second light-emitting layer 160 is located on a side of the first light-emitting layer 140 away from the substrate 100, and the orthographic projection of the second light-emitting layer 160 on the plane where the substrate 100 is located overlaps at least partially with the orthographic projection of the first light-emitting layer 140 on the plane where the substrate 100 is located. At least part of the first light-emitting layer 140 and the second light-emitting layer 160 are located in the first groove 122; illustratively, the first light-emitting layer 140 and the second light-emitting layer 160 can both be made of a fine metal mask (FMM). The first light-emitting layer 140 is deposited in the first groove 122 of the pixel definition layer 120 and can partially extend to the outside of the first groove 122. The first light-emitting layers 140 of different sub-pixels are independent of each other. The second light-emitting layers 160 of different sub-pixels are independent of each other.

[0063] For example, the light-emitting colors of the first light-emitting layer 140 and the second light-emitting layer 160 may be the same or different.

[0064] like Figure 3 As shown, the display panel 10 may further include a charge generation layer 150 and a second electrode 170, wherein the charge generation layer 150 is located between the first light emitting layer 140 and the second light emitting layer 160, and the second electrode 170 is located on a side of the second light emitting layer 160 away from the charge generation layer 150. For example, Fig.13 As shown, the charge generation layer 150 can be continuous in the second groove 123. In other implementations, the charge generation layer 150 can also be disconnected in the second groove 123, so as to cut off the lateral leakage current between two adjacent sub-pixels 130, overcome the crosstalk between adjacent sub-pixels 130 caused by the high conductivity of the charge generation layer 150, and help improve the display quality of the display panel 10. Alternatively, the charge generation layer 150 can also be convexly arranged in the second groove 123 toward the side away from the base substrate 100, so as to increase the transmission path of the lateral leakage current in the charge generation layer 150, suppress the lateral leakage current between two adjacent sub-pixels 130, overcome the crosstalk between adjacent sub-pixels 130 caused by the high conductivity of the charge generation layer 150, and help improve the display quality of the display panel 10.

[0065] Continue to refer to Figure 3 , the display panel 10 may further include a first carrier layer 151, a second carrier layer 152, a third carrier layer 153 and a fourth carrier layer 154, the first carrier layer 151 is located between the first light-emitting layer 140 and the first electrode 110, the second carrier layer 152 is located between the second light-emitting layer 160 and the second electrode 170, the third carrier layer 153 is located between the first light-emitting layer 140 and the charge generation layer 150, and the fourth carrier layer 154 is located between the second light-emitting layer 160 and the charge generation layer 150. Exemplarily, the first electrode 110 is an anode, the second electrode 170 is a cathode, the first carrier layer 151 may include an electron injection layer and / or an electron transport layer, the second carrier layer 152 may include a hole injection layer and / or a hole transport layer, the third carrier layer 153 may include a hole injection layer and / or a hole transport layer, and the fourth carrier layer 154 may include an electron injection layer and / or an electron transport layer, which is not limited here. The first carrier layer 151, the second carrier layer 152, the third carrier layer 153 and the fourth carrier layer 154 may be common layers and deposited in the second groove 123 to extend the leakage path and improve the leakage. For example, the common layers may be prepared using a common mask.

[0066] In the display panel 10 , by setting the sub-pixel 130 to a series structure including a first light-emitting layer 140 and a second light-emitting layer 160 that are stacked, the light-emitting brightness of the sub-pixel 130 can be increased, the power consumption of the display panel 10 can be reduced, and the life of the display panel 10 can be increased.

[0067] In the display panel 10 provided in the embodiment of the present disclosure, the pixel definition layer 120 further includes a second groove 123, which is located on the side of the main body 121 away from the base substrate 100 and is used to extend the leakage path between adjacent sub-pixels to improve leakage and enhance display effects. Figure 1 Taking the display panel 10 shown as an example, the second groove 123 can be arranged around the first groove 122 for defining the light-emitting area, and the second groove 123 has at least one break around the first groove 122, which enables the second electrode 170 to be well connected; at the same time, at the position of the break, the impedance of the second electrode 170 will be relatively small, which can reduce the attenuation of the electrical signal caused by the impedance, and is conducive to improving the display uniformity. For example, Figure 1 It is only shown that the second groove 123 around the luminous area of ​​the same color has two or three fractures, that is, the second groove 123 is divided into two or three sections. In other implementations, the second groove 123 can also be set to other numbers and shapes, which are not limited here.

[0068] For example, continue to refer to Figure 4 The main body 121 of the pixel definition layer 120 includes a bottom surface 1211 and a first side surface 1212, wherein the bottom surface is a side facing the base substrate 100. Figure 1 Taking the shown orientation as an example, the bottom surface 1211 is the lower surface of the main body 121; the first side surface 1212 is close to the first groove 122, or it can be understood that the first side surface 1212 is facing the first groove 122, and there is an angle A0 between the first side surface 1212 and the bottom surface 1211, and the angle A0 can also be understood as the inclination angle of the main body 121 of the pixel definition layer 120 in the first groove 122.

[0069] In the display panel 10 provided by the embodiment of the present disclosure, by setting the angle A0 to be less than or equal to 40 degrees, the inclination angle of the main body 121 of the pixel definition layer 120 at the first groove 122 can be smaller, thereby reducing the shielding of large-angle light by the main body 121, allowing more large-angle light to be emitted from the display panel, thereby improving the color cast problem.

[0070] For example, Figure 5 A schematic diagram of a display panel structure provided for related technology, Figure 6A schematic diagram of another display panel structure provided for related art. 10-1 represents a first display panel in which a pixel definition layer is provided with a second groove for improving leakage flow, 10-2 represents a second display panel in which a pixel definition layer does not have a second groove for improving leakage flow, A1 represents the inclination angle of the main body 121 of the pixel definition layer 120 in the first display panel 10-1 in the first groove 122, and A2 represents the inclination angle of the main body 121 of the pixel definition layer 120 in the second display panel 10-2 in the first groove 122. Comparing the display panel structures of 10-1 and 10-2, the technicians of the present application found that the groove structure (with Figure 5 In the first display panel 10-1 (shown in the figure with the second groove 123 in the figure), because it is necessary to groove the main body 121 of the pixel definition layer 120 on the side away from the base substrate 100, the thickness of the pixel definition layer 120 needs to be greater than the thickness of the pixel definition layer 120 in the second display panel 10-2 with a non-grooved structure, which causes the corresponding inclination angle A1 to be larger than the inclination angle A2. When the inclination angle A1 is greater than 40 degrees, the main body 121 will block the large-angle outgoing light, resulting in visual effects problems such as color cast.

[0071] In view of this, in the display panel 10 provided in the embodiment of the present disclosure, by setting the angle A0 to be less than or equal to 40 degrees, the inclination angle of the main body 121 of the pixel definition layer 120 at the first groove 122 is smaller, thereby reducing the shielding of large-angle light by the main body 121, allowing more large-angle light to be emitted from the display panel, thereby improving the color cast problem.

[0072] Exemplarily, the angle A0 may be 40 degrees, 38 degrees, 35 degrees, 36.9 degrees, 35.5 degrees, 37 to 40 degrees, 30 to 35 degrees, or other angles or angle ranges less than or equal to 40 degrees, and may be set according to requirements of the display panel 10 and is not limited here.

[0073] It should be noted that, in the same display panel 10, the angle A0 at different positions of the first grooves 122 may be the same or different; the angle A0 on different sides of the same first groove 122 may be the same or different; the angle A0 at different positions on the same side of the same first groove 122 may be the same or different, which is not limited here.

[0074] In some implementations, Figure 7 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure is shown in FIG. Figure 8 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure is shown in FIG. Fig. 9 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure is shown in FIG. Fig.10 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure is shown in FIG. Fig.11A schematic diagram of the structure of another display panel provided by an embodiment of the present disclosure. Figure 1 or Figure 7-Figure 11 In any of the figures, in the display panel 10, the first side surface 1212 is located at least on one side of the first groove 122. Wherein, on the side where the first side surface 1212 is located, the main body 121 of the pixel definition layer 120 is inclined at an angle less than or equal to 40 degrees in the first groove 122, which can reduce the shielding of light emitted at a large angle and improve the color cast problem under the corresponding viewing angle.

[0075] The planar shape of the first groove 122 may be a quadrilateral, a hexagon or other polygon, a circle, an ellipse or other shapes, which are not limited here. The planar shape of the first groove 122 is the shape of the first groove 122 in a plane parallel to the plane where the base substrate 100 is located, for example, the shape in a plane determined by the first direction X and the second direction Y. The following description takes the quadrilateral first groove 122 as an example.

[0076] Based on this, the first side surface 1212 may be located at one side of the first groove 122. Figure 7 or Figure 8 Taking the orientation shown in FIG. 1 as an example, the first side surface 1212 may be located on the left side of the first groove 122 (refer to FIG. 11 ). Figure 7 ), right side (reference Figure 8 ), the upper side or the lower side, so that the inclination angle of the main body 121 on the corresponding side is less than or equal to 40 degrees, thereby improving the color cast problem under the viewing angle of the corresponding side.

[0077] Alternatively, the first side surface 1212 may be located on both sides of the first groove 122, so that the inclination angle of the main body 121 on the corresponding two sides is less than or equal to 40 degrees, thereby improving the color cast problem under the viewing angles of the corresponding two sides. Fig.10 , the first side surface 1212 may be located on two adjacent sides of the first groove 122. Taking the orientation shown in the figure as an example, the first side surface 1212 may be located on the left side and the upper side of the first groove 122; or, the first side surface 1212 may be located on the left side and the lower side of the first groove 122, or on the right side and the upper side of the first groove 122, or on the right side and the lower side of the first groove 122. Or, referring to Fig. 9 or Fig.11 The first side surface 1212 may also be located on opposite sides of the first groove 122. Taking the orientation shown in the figure as an example, the first side surface 1212 may be located on the left and right sides of the first groove 122 (refer to Fig. 9 ), or located at the upper and lower sides of the first groove 122 (reference Fig.11 ).

[0078] In other implementations, when the shape of the first groove 122 is a quadrilateral, the first side surface 1212 may also be located on three sides of the first groove 122 (see Fig.12 ) or four sides (reference Figure 1 ), which is not limited here. It should be noted that, Figure 1 as well as Figure 7 to Figure 11 In FIG. 1 , the first side surface 1212 of the main body 121 is shown by a bold line.

[0079] In other implementations, when the shape of the first groove 122 is other polygonal, the first side surface 1212 may be located on one side, two sides, or more sides of the first groove 122 to achieve color cast improvement on the corresponding side that meets display requirements, which is not limited here. It should be noted that when the first side surface 1212 is located on two sides or more sides of the first groove 122, the sizes of the angles corresponding to different sides may be the same or different, which is not limited here.

[0080] In some implementations, reference Figure 1 , the first side surface 1212 surrounds the first groove 122 .

[0081] Such arrangement enables the inclination angles of the main body 121 of the pixel definition layer 120 on the different sides of the first groove 122 to be less than or equal to 40 degrees, which can reduce the shielding of the main body 121 on the sides of the first groove to the large-angle outgoing light, thereby improving the color cast problem of the display panel at different viewing angles.

[0082] For example, Fig.10 Taking the display panel 10 shown as an example, the first groove 122 is a quadrilateral, and the first side surface 1212 can be disposed on four different sides of the first groove 122 , namely, top, bottom, left, and right, to surround the first groove 122 .

[0083] In other implementations, when the first groove 122 is in other shapes, the first side surface 1212 may be disposed on all sides of the first groove 122 to surround the first groove 122 , thereby improving the color cast problem at all different viewing angles.

[0084] In some implementations, continue to refer to Figure 2 , a width W0 of a vertical projection of the first side surface 1212 on the base substrate 100 is greater than or equal to 5.0 microns, that is, W0 ≥ 5.0 microns.

[0085] Such a configuration enables the first side surface 1212 to have a sufficient width, which facilitates process design and processing on the first side surface 1212, so as to remove more edge portions of the main body 121 in the first groove 122, thereby forming a smaller angle A0 and improving the color cast problem.

[0086] Combination Figure 1 and Figure 2, the vertical projection of the first side surface 1212 on the substrate 100 can be understood as the projection obtained by projecting the first side surface 1212 along a direction perpendicular to the substrate 100, the plane where the projection is located is parallel to the plane where the substrate 100 is located, the plane where the substrate 100 is located can be understood as the plane determined by the first direction X and the second direction Y, and the direction Z perpendicular to the plane where the substrate 100 is located can be the third direction Z. Based on this, the vertical projection of the first side surface 1212 on the substrate 100 can be understood as the projection of the first side surface 1212 in the plane determined by the first direction X and the second direction Y, and the width W0 of the vertical projection of the first side surface 1212 on the substrate 100 can be 5.0 microns, 5.2 microns, 5.0 to 5.3 microns, or other width values ​​or width ranges greater than 5.0 microns, which are not limited here.

[0087] In some implementations, continue to refer to Figure 2 In a direction Z perpendicular to the plane where the base substrate 100 is located, a thickness T0 of the main body 121 is greater than or equal to 1.4 microns, that is, T0 ≥ 1.4 microns.

[0088] In this way, the main body 121 of the pixel definition layer 120 has a sufficient thickness to form a light emitting device and form the second groove 123 to improve leakage.

[0089] Exemplarily, the thickness T0 of the main body 121 may be 1.4 micrometers, 1.5 micrometers, 1.5 to 2.0 micrometers, or other thickness values ​​or thickness ranges greater than 1.4 micrometers, which are not limited herein.

[0090] In some implementations, continue to refer to Figure 2 , the thickness T0 of the main body 121 is less than or equal to 3.0 microns, that is, T0≤3.0 microns.

[0091] Such a configuration ensures that the thickness of the main body 121 of the pixel definition layer 120 will not be too thick, thereby ensuring that the overall thickness of the laminated structure display panel will not be too thick, which is conducive to achieving a lightweight display panel; at the same time, the angle A0 between the bottom surface 1211 of the main body 121 and the first side surface 1212 can be processed to be smaller, which is conducive to improving the color cast problem.

[0092] Exemplarily, the thickness T0 of the main body 121 may be 1.4 μm, 1.5 μm, 2.4 μm, 2.5 μm, 2.8 μm, 3.0 μm, 2.7 to 3.0 μm, or other thickness values ​​or thickness ranges between 1.4 μm and 3.0 μm, which are not limited herein.

[0093] In some implementations, continue to refer to Figure 2In a direction Z perpendicular to the plane where the base substrate 100 is located, a height H1 of the second groove 123 is smaller than a thickness T0 of the main body 121 .

[0094] Such a configuration allows the main body 121 of the pixel definition layer 120 to form a groove structure on the side away from the base substrate 100, so as to extend the leakage path and improve the leakage. The height of the second groove 123 is less than the thickness of the main body 121, which means that the second groove 123 does not penetrate the pixel definition layer 120. This can extend the leakage path on the one hand, and on the other hand, it can also avoid the formation of a large step difference between the bottom of the second groove 123 and the top surface of the main body 121, which may cause some common layers (for example, the cathode) to be disconnected at the second groove 123. If the common layer is disconnected at the second groove 123, it will affect the transmission of electrons or holes and affect the display effect. Figure 2 Taking the orientation shown in FIG. 1 as an example, a second groove 123 is formed on a side of the main body 121 of the pixel definition layer 120 away from the base substrate 100 .

[0095] In some implementations, Fig.13 For along Fig.12 A schematic diagram of a cross-sectional structure of A3-A4. Fig.12 and Fig.13 , the display panel 10 further includes a plurality of sub-pixels 130, the sub-pixels 130 include a first electrode 110; the plurality of sub-pixels 130 include a first color sub-pixel 131 and a second color sub-pixel 132, the first color is different from the second color; the first side surface 1212 includes a first side surface A 12121 and a first side surface B 12122, in a direction Z perpendicular to the plane where the base substrate 100 is located, the first side surface A 12121 overlaps with the first color sub-pixel 131, and the first side surface B 12122 overlaps with the second color sub-pixel 132; wherein the angle A0( Fig.12 The angle A0 between the first side surface 12122 and the bottom surface 1211 is shown as the first angle A01. Fig.12 The second angle A02 is shown in FIG. 2 ). Fig.13 In the figure, the first light-emitting layer 140 represents the light-emitting layer, and the left and right first light-emitting layers represent two sub-pixels of different colors.

[0096] The first color sub-pixel 131 is used to emit light of a first color, and the second color sub-pixel 132 is used to emit light of a second color. The first color is different from the second color, and their contributions to the display screen are different, that is, the display screen has different requirements for the first color light and the second color light. Exemplarily, the first color and the second color can be two of red, green, blue, white or other colors, and the first color is different from the second color.

[0097] In the display panel 10 provided in the embodiment of the present disclosure, the first angle A01 is set to be different from the second angle A02, so that the main body 121 of the pixel definition layer 120 corresponding to the first color sub-pixel 131 blocks the large-angle light differently from the main body 121 of the pixel definition layer 120 corresponding to the second color sub-pixel 132. As a result, the large-angle light emitted by the first color sub-pixel 131 is different from the large-angle light emitted by the second color sub-pixel 132, which can meet the different requirements of the display screen for the first color light and the second color light.

[0098] In some implementations, the brightness decay rate of the first color sub-pixel 131 is greater than the brightness decay rate of the second color sub-pixel 132; the angle A0 ( Fig.12 is smaller than the angle A0 ( Fig.12 (shown as a second angle A02 in FIG. 1 ).

[0099] Among them, the brightness decay rate of the first color sub-pixel 131 is greater than the brightness decay rate of the second color sub-pixel 132, that is, the brightness decay of the first color sub-pixel 131 is faster. Therefore, after the display panel 10 is used for a certain period of time, that is, after the first color sub-pixel 131 and the second color sub-pixel 132 have been used for the same period of time, the brightness of the first color sub-pixel 131 will be darker than the brightness of the second color sub-pixel 132. In view of this, in the display panel 10 provided by the embodiment of the present disclosure, by setting the first angle A01 to be smaller than the second angle A02, the main body 121 of the pixel definition layer 120 corresponding to the first color sub-pixel 131 can block less light than the second color sub-pixel 132, so that the first color sub-pixel 131 can emit more light, thereby compensating for the brightness decay and ensuring the display effect of the display panel 10.

[0100] Exemplarily, for a display panel including red sub-pixels, blue sub-pixels and green sub-pixels, the brightness decay speed is arranged from fast to slow as follows: blue sub-pixel, green sub-pixel, red sub-pixel; and the angles used are arranged from small to large as follows: blue sub-pixel, green sub-pixel, red sub-pixel.

[0101] In other implementations, when the sub-pixels in the display panel are sub-pixels of other colors, the corresponding angle can also be set based on the brightness decay rate of the sub-pixels. For example, the greater the brightness decay rate, the smaller the corresponding angle.

[0102] In some implementations, the display panel 10 also includes a plurality of sub-pixels 130, the sub-pixels 130 include a first electrode 110; in a direction perpendicular to the plane where the base substrate 100 is located, the first side surface 1212 overlaps with the sub-pixel 130; wherein the angles A0 between the first side surface 1212 and the bottom surface 1211 corresponding to sub-pixels 130 of different colors are the same.

[0103] Such a configuration not only meets the need for improving color cast, but also does not require differentiating the angles of sub-pixels 130 of different colors, which helps to reduce the difficulty of designing and processing the display panel 10, thereby improving the yield and reducing costs.

[0104] In other implementations, the display panel 10 may further include other structural components known to those skilled in the art, which are neither detailed nor limited herein.

[0105] Based on the same inventive concept, the embodiment of the present disclosure also provides a method for preparing a display panel, which is used to prepare any display panel provided in the above embodiments and has corresponding beneficial effects. The similarities can be understood by referring to the above and will not be repeated here.

[0106] For example, Fig.14 A schematic diagram of a method for manufacturing a display panel provided by an embodiment of the present disclosure. Fig.14 , the method for preparing the display panel may include the following steps.

[0107] S210, providing a substrate.

[0108] For example, Fig.15 for Fig.14 The structure diagram of a substrate provided in S210 of the preparation method is shown. Fig.15 The base substrate 100 may be a glass substrate. In other implementations, the base substrate may also be a stainless steel substrate, a polyimide substrate, or a rigid substrate or a flexible substrate of other materials, which is not limited here.

[0109] In some implementations, the base substrate may also be a driving circuit substrate, that is, a substrate formed with a driving circuit layer, which is not limited here.

[0110] S220, forming a plurality of first electrodes on one side of the base substrate.

[0111] The display panel includes a plurality of first electrodes. When preparing the display panel, it is necessary to form a plurality of first electrodes on one side of the substrate. Fig.16 .

[0112] Exemplarily, the first electrode is an electrode structure of a light-emitting element in a display panel. The light-emitting element in the display panel may be an organic light-emitting diode (OLED), and the first electrode may be an anode or other pixel electrode, such as a cathode, which is not limited here.

[0113] The pixel circuit of the display panel is electrically connected to the first electrode on the substrate. The pixel circuit includes an active layer, a gate, a source and a drain. Fig.13 The pixel circuit 101 includes a multi-layer insulating layer stacked between the substrate and the first electrode, such as a buffer layer, a gate insulating layer, an interlayer insulating layer and a planarization layer. The insulating layer can be set based on the type and number of specific pixel circuits. The embodiments of the present disclosure are not limited to this and can be adaptively adjusted according to the display panel and its preparation method.

[0114] It should be noted that the preparation process of the first electrode may be mask evaporation or other processes known to those skilled in the art, which is not limited here.

[0115] S230, forming a pixel definition layer on a side of the first electrode facing away from the substrate.

[0116] The display panel includes a patterned pixel definition layer. In this step, a whole layer of pixel definition layer is first formed, which can be referred to as Fig.17 , and is patterned in subsequent steps to form a pixel definition layer that meets the needs of the display panel.

[0117] Exemplarily, the entire pixel definition layer formed in this step is on the side of the first electrode away from the substrate and covers the first electrode. In subsequent steps, the first electrode can be exposed by patterning the entire pixel definition layer, which will be described in detail later.

[0118] It should be noted that the preparation process of the pixel definition layer may be evaporation or other processes known to those skilled in the art, which is not limited here.

[0119] S240, patterning the pixel definition layer to form a main body, a first groove and a second groove; wherein the first groove penetrates the pixel definition layer and exposes the first electrode, the main body is located between two adjacent first grooves, and the second groove is located on a side of the main body away from the substrate; an angle is formed between the bottom surface of the main body and the first side surface close to the first groove, and the angle is less than or equal to 40 degrees.

[0120] Wherein, by patterning the pixel definition layer, the main body can be retained and the first groove and the second groove can be formed. Fig.18The first groove 122 penetrates the pixel definition layer 120 and exposes at least a portion of the first electrode 110, so as to subsequently achieve contact between the first electrode 110 and other film layers of the light-emitting element in the first groove 122; the second groove 123 is formed on the side of the main body 121 away from the base substrate 100, and is used to extend the leakage path between adjacent sub-pixels to improve leakage and enhance the display effect.

[0121] The main body 121 of the pixel definition layer 120 includes a bottom surface 1211 and a first side surface 1212. The bottom surface is a side facing the base substrate 100. Fig.18 Taking the shown orientation as an example, the bottom surface 1211 is the lower surface of the main body 121; the first side surface 1212 is close to the first groove 122, or it can be understood that the first side surface 1212 is facing the first groove 122, and there is an angle A0 between the first side surface 1212 and the bottom surface 1211, and the angle A0 can also be understood as the inclination angle of the main body 121 of the pixel definition layer 120 in the first groove 122.

[0122] In the method for preparing a display panel provided in an embodiment of the present disclosure, the pixel definition layer is patterned so that the angle between the bottom surface of the main body of the pixel definition layer and the first side surface facing the first groove is less than or equal to 40 degrees. This can make the inclination angle of the main body of the pixel definition layer at the first groove smaller, reduce the shielding of large-angle light by the main body, and enable more large-angle light to be emitted from the display panel, thereby improving the color cast problem.

[0123] In some implementations, Fig.19 for Fig.14 The detailed process flow diagram of S240 in the preparation method is shown. Fig.14 Based on the reference Fig.19 , patterning the pixel definition layer, which may specifically include:

[0124] S241 , patterning the pixel definition layer based on a half-tone mask to form a first groove in the pixel definition layer.

[0125] Among them, the half-tone mask can be designed with differentiated transmittance to meet the film removal requirements at different positions of the pixel definition layer.

[0126] Exemplarily, at the position corresponding to the first groove, the transmittance of the half-tone mask plate can be 100%, that is, the first groove corresponds to the fully transparent area of ​​the half-tone mask plate; and, at the edge position of the main body at the first groove, the half-tone mask plate can be provided with a semi-transparent area to remove more of the film layer of the main body at the edge position of the first groove, thereby reducing the inclination angle of the main body of the retained pixel definition layer in the first groove.

[0127] For example, Fig. 20 for Fig.19The schematic diagram of the structure formed in step S241 in the process shown in FIG. Fig. 20 In the structure formed in this step, the pixel definition layer 120 includes a main body 121 and a first groove 122, and an angle A0 is formed between a bottom surface 1211 of the main body 121 and a first side surface 1212 close to the first groove 122, and the angle A0 is less than or equal to 40 degrees.

[0128] In some implementations, Fig.21 for Fig.19 The detailed step flow diagram of S241 in the step flow shown in FIG. Fig.19 Based on the reference Fig.21 , patterning the pixel definition layer based on a halftone mask plate, and forming a first groove in the pixel definition layer, may specifically include:

[0129] S2411. Provide a half-tone mask.

[0130] The half-tone mask includes a plurality of fully transparent areas, a semi-transparent area located at at least one side of the fully transparent area, and an opaque area surrounding the fully transparent area and the semi-transparent area.

[0131] Among them, the pixel definition layer at the corresponding position of the fully transparent area is completely removed, and an inclination angle is formed based on process limitations; the inclination angle of the pixel definition layer at the corresponding position of the semi-transparent area is reduced, and the pixel definition layer at the corresponding position of the opaque area is retained.

[0132] For example, Fig. 22 A schematic diagram of the structure of a half-tone mask provided by an embodiment of the present disclosure. Fig. 22 The half-tone mask plate 50 includes a plurality of fully transparent areas 501, a semi-transparent area 502 located at at least one side of the fully transparent area 501, and an opaque area 503 surrounding the fully transparent area 501 and the semi-transparent area 502. It can be understood that Fig. 22 In the illustrated half-tone mask 50, only four fully transparent areas 501 are exemplarily shown, and the semi-transparent areas 502 are respectively arranged in a whole circle around the fully transparent areas 501. In other implementations, the number, shape, and arrangement of the fully transparent areas 501, and the manner in which the semi-transparent areas 502 surround the fully transparent areas 501 can also be arranged based on the requirements of the display panel and the manufacturing method thereof, and are not limited here.

[0133] S2412, align the half-tone mask plate with the base substrate.

[0134] Wherein, in a direction perpendicular to the plane where the substrate is located, the fully transparent area is located inside the first electrode, so as to remove the pixel definition layer at a position corresponding to the first electrode to form a first groove exposing the first electrode.

[0135] For example, Fig.23A schematic diagram of the alignment of a half-tone mask plate and a substrate provided in an embodiment of the present disclosure. Fig.23 In the direction Z perpendicular to the plane where the base substrate 100 is located, the range of the fully transparent area 501 is located within the range of the first electrode 110. In this way, by completely removing the pixel definition layer 120 at the corresponding position of the fully transparent area 501, a first groove 122 exposing the first electrode 110 can be formed. At the same time, the semi-transparent area 502 is located on at least one side of the fully transparent area 501, so that more of the pixel definition layer 120 at the edge position of the first groove 122 on the corresponding side is removed, and a smaller tilt angle is formed accordingly.

[0136] S2413, etching the pixel definition layer, removing the pixel definition layer corresponding to the fully transparent area, forming a first groove; and removing part of the pixel definition layer in the semi-transparent area, forming a first side surface.

[0137] Among them, by etching the pixel definition layer, the pixel definition layer corresponding to the fully transparent area is removed to form a plurality of first grooves, and the first groove exposes at least a portion of the first electrode; synchronously, the pixel definition layer corresponding to the semi-transparent area is partially removed, that is, more of the pixel definition layer at the edge position of the first groove is removed to form a first side surface of the main body, and an angle is formed between the first side surface and the bottom surface of the main body, and the angle is less than or equal to 40 degrees, so as to allow large-angle light to be emitted and improve color cast.

[0138] S242, etching the pixel definition layer having the first groove to form a second groove on a side of the main body away from the base substrate.

[0139] Exemplarily, a pixel definition layer having a first groove may be etched by a dry etching process to form a second groove on a side of the main body away from the substrate. Specifically, a photoresist may be disposed on a side of the pixel definition layer away from the substrate, and a photoresist opening may be formed in the photoresist, the photoresist opening being an opening of the disposed photoresist, and the photoresist opening does not overlap with the first groove. Based on this, the pixel definition layer is dry-etched to form a second groove at the photoresist opening.

[0140] In other implementations, the second groove may be formed by other methods known to those skilled in the art, which are not limited here.

[0141] In some implementations, continue to refer to Fig.23 , the transmittance T of the semi-transparent area 502 is: 16%≤T≤30%.

[0142] Exemplarily, the transmittance of the semi-permeable area 502 may be 16%, 20%, 25%, 30%, 28%, 18%-21%, 23%-27% or other transmittance values ​​or transmittance ranges, which are not limited herein.

[0143] Specifically, when the transmittance of the semi-transparent area 502 is different, the thickness of the corresponding pixel definition layer 120 removed is different, and the inclination angle of the first side surface relative to the bottom surface is different, that is, the angle between the first side surface and the bottom surface is different.

[0144] Therefore, by setting the transmittance of the semi-transparent area 502 to satisfy 16%≤T≤30%, while achieving the angle between the first side surface and the bottom surface being less than or equal to 40 degrees, the angle can also be differentiated for sub-pixels of different colors to meet display requirements; at the same time, a certain process error can be allowed to reduce the requirements for the process and improve the yield rate.

[0145] In some implementations, continue to refer to Fig.23 , the width W of the semi-transparent area 502 is: 2 micrometers≤W≤W0; wherein W0 represents the width of the vertical projection of the first side surface on the base substrate 100.

[0146] Specifically, the semi-transparent area 502 is configured to reduce the edge thickness of the main body toward the first groove 122, thereby reducing the inclination angle of the first side surface relative to the bottom surface. Therefore, the width of the semi-transparent area 502 should be within the range of the first side surface 1212 to accurately thin the edge of the main body toward the first groove, while avoiding the influence of this configuration on other structures in the display panel.

[0147] Exemplarily, the width W may be 2.0 micrometers, 3.5 micrometers, W0, or other width values ​​or width ranges between 2.0 micrometers and W0, which are not limited herein.

[0148] In some implementations, Fig.24 for Fig.21 The detailed step flow diagram of S2411 in the step flow is shown. Fig.21 Based on the reference Fig.24 , providing a half-tone mask, which may specifically include:

[0149] S24111. Determine a target transmittance and a target width of the semi-transparent area based on an angle between the first side surface and the bottom surface.

[0150] The larger the width of the semi-transparent area, the smaller the angle; the higher the transmittance of the semi-transparent area, the smaller the angle. Based on this, for the angle between the first side surface and the bottom surface, the transmittance and width of the semi-transparent area can be comprehensively considered to determine, that is, to determine the target transmittance and target width; the target transmittance and target width can achieve the required angle.

[0151] For example, the target width of the semi-transparent area is designed with a transmittance of 20%. When the width of the semi-transparent area is 3.0 microns, an angle of 40 degrees can be achieved; thus, for an angle of 40 degrees, the target width of the semi-transparent area can be 3.0 microns. Alternatively, when the width of the semi-transparent area is 3.3 microns, an angle of 38 degrees can be achieved; thus, for an angle of 38 degrees, the target width of the semi-transparent area can be 3.3 microns. Alternatively, when the width of the semi-transparent area is greater than or equal to 5.0 microns, an angle less than or equal to 30 degrees can be achieved; thus, for an angle less than or equal to 30 degrees, the target width of the semi-transparent area can be less than or equal to 3.0 microns.

[0152] In other implementations, the transmittance of the semi-transparent area can be set to other target transmittances and the width of the semi-transparent area can be set to other target widths according to angle requirements, which are not limited here.

[0153] S24112. Provide a half-tone mask having a semi-transparent area with a target transmittance and a target width.

[0154] Specifically, after the target width and target transmittance of the semi-transparent area are determined, a half-tone mask that meets the requirements can be designed and provided based on the width and transmittance requirements.

[0155] Therefore, according to the angle size, a half-tone mask that meets the needs can be designed and provided.

[0156] In some implementations, aligning the half-tone mask plate with the base substrate may further include:

[0157] In a direction perpendicular to the plane where the substrate is located, the second groove is located in the impermeable area.

[0158] For example, continue to refer to Fig.23 , in the direction Z perpendicular to the plane where the base substrate 100 is located, the second groove 123 is located in the non-transparent area 503. Thus, after etching the pixel definition layer 120 with a half-tone mask, the first groove 122 is formed, and a portion for forming the second groove 123 can be reserved in the main body 121, and the second groove 123 can be formed by dry etching in subsequent steps.

[0159] In the method for preparing the display panel provided by the embodiment of the present disclosure, by aligning the half-tone mask plate with the base substrate, the fully transparent area is located in the first electrode, the second groove is located in the opaque area, and the semi-transparent area is located at the edge of the first groove in a direction perpendicular to the plane of the base substrate, thereby achieving precise alignment, which facilitates the formation of the first groove by removing the pixel definition layer in the fully transparent area in the subsequent steps, removing part of the pixel definition layer in the semi-transparent area to form the first side, and subsequently removing part of the pixel definition layer corresponding to the opaque area by dry etching to form the second groove.

[0160] In other implementations, for a display panel with a single-layer light-emitting structure, the method for preparing the display panel may further include:

[0161] forming a first carrier layer;

[0162] forming a first light-emitting layer, wherein the first light-emitting layer may include light-emitting block structures of different colors formed by mask evaporation;

[0163] forming a second carrier layer;

[0164] A second electrode is formed.

[0165] In other implementations, for a display panel having a laminated light-emitting structure, the steps of preparing the display panel may further include:

[0166] forming a light emitting device structure;

[0167] forming a charge generation layer between two adjacent light-emitting devices;

[0168] Among them, the light-emitting device structure may include a light-emitting layer, and carrier layers located above and below the light-emitting layer. The carrier layers may include an electron injection layer and / or an electron transport layer located on the side of the light-emitting layer facing the first electrode, and a hole injection layer and / or a hole transport layer located on the side of the light-emitting layer facing the second electrode.

[0169] In other implementations, the method for preparing the display panel may further include forming other film layers known to those skilled in the art such as an encapsulation protection film layer, which is not limited here.

[0170] On the basis of the above-mentioned embodiments, an embodiment of the present disclosure further provides a display device, which may include any display panel provided in the above-mentioned embodiments, and has corresponding beneficial effects.

[0171] For example, Fig.25 This is a schematic diagram of the structure of a display device provided by an embodiment of the present disclosure. Fig.25 The display device 30 includes a display panel 10, and the display panel 10 can be any display panel provided in the above-mentioned embodiments.

[0172] Exemplarily, the display device 30 includes but is not limited to a mobile phone, a computer, a smart wearable device with a display function, and other structural components with a display function, which are not elaborated or limited here.

[0173] In other embodiments, the display device 30 may further include other structural components known to those skilled in the art, which are neither described nor limited herein.

[0174] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0175] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display panel, characterized in that: include: substrate substrate; A plurality of first electrodes are located on one side of the substrate; A pixel definition layer is located on a side of the first electrode away from the substrate; the pixel definition layer comprises a main body, a first groove and a second groove, the first groove penetrates the pixel definition layer and exposes the first electrode, the main body is located between two adjacent first grooves, and the second groove is located on a side of the main body away from the substrate; There is an angle between the bottom surface of the main body and the first side surface of the main body close to the first groove, and the angle is less than or equal to 40 degrees.

2. The display panel according to claim 1, characterized in that: The first side surface is located on at least one side of the first groove.

3. The display panel according to claim 2, characterized in that: The first side surface surrounds the first groove.

4. The display panel according to claim 1, characterized in that: A width of a vertical projection of the first side surface on the base substrate is greater than or equal to 5.0 micrometers.

5. The display panel according to claim 1, characterized in that: In a direction perpendicular to the plane where the base substrate is located, the thickness of the main body is greater than or equal to 1.4 microns.

6. The display panel according to claim 5, characterized in that: The thickness of the main body is less than or equal to 3.0 microns.

7. The display panel according to claim 1, characterized in that: In a direction perpendicular to the plane where the base substrate is located, the height of the second groove is smaller than the thickness of the main body.

8. The display panel according to claim 1, characterized in that: Also included are a plurality of sub-pixels, each of which includes the first electrode; The plurality of sub-pixels include a first color sub-pixel and a second color sub-pixel, the first color being different from the second color; The first side surface includes a first side surface A and a first side surface B. In a direction perpendicular to the plane where the substrate is located, the first side surface A overlaps with the first color sub-pixel, and the first side surface B overlaps with the second color sub-pixel; The included angle between the first A side surface and the bottom surface is different from the included angle between the first B side surface and the bottom surface.

9. The display panel according to claim 8, characterized in that: The brightness decay rate of the first color sub-pixel is greater than the brightness decay rate of the second color sub-pixel; An included angle between the first A side surface and the bottom surface is smaller than an included angle between the first B side surface and the bottom surface.

10. The display panel according to claim 1, characterized in that: Also included are a plurality of sub-pixels, each of which includes the first electrode; In a direction perpendicular to the plane where the substrate is located, the first side surface overlaps with the sub-pixel; The included angles between the first side surface and the bottom surface corresponding to the sub-pixels of different colors are the same.

11. The display panel according to claim 1, characterized in that: Also includes: A first light-emitting layer is located on a side of the first electrode away from the substrate; A charge generation layer, located on a side of the first light-emitting layer away from the first electrode; A second light-emitting layer is located on a side of the charge generating layer away from the first light-emitting layer; The second electrode is located on a side of the second light-emitting layer away from the charge generating layer.

12. A method for preparing a display panel, characterized in that: include: providing a substrate base plate; forming a plurality of first electrodes on one side of the base substrate; forming a pixel definition layer on a side of the first electrode away from the base substrate; Performing patterning on the pixel definition layer to form a main body, a first groove and a second groove; Among them, the first groove penetrates the pixel definition layer and exposes the first electrode, the main body is located between two adjacent first grooves, and the second groove is located on the side of the main body away from the base substrate; there is an angle between the bottom surface of the main body and the first side surface of the main body close to the first groove, and the angle is less than or equal to 40 degrees.

13. The method for preparing a display panel according to claim 12, characterized in that: The pixel definition layer is patterned, comprising: patterning the pixel definition layer based on a half-tone mask to form the first groove in the pixel definition layer; The pixel definition layer having the first groove is etched to form the second groove on a side of the main body away from the base substrate.

14. The method for preparing a display panel according to claim 13, characterized in that: The step of patterning the pixel definition layer based on a half-tone mask to form the first groove in the pixel definition layer includes: A half-tone mask is provided; the half-tone mask comprises a plurality of fully transparent areas, a semi-transparent area located at least on one side of the fully transparent area, and an opaque area surrounding the fully transparent area and the semi-transparent area; Aligning the half-tone mask plate with the base substrate; in a direction perpendicular to the plane where the base substrate is located, the range of the full-transmission area is located within the range of the first electrode; The pixel definition layer is etched to remove the pixel definition layer corresponding to the fully transparent area to form the first groove; and a portion of the pixel definition layer in the semi-transparent area is removed to form the first side surface.

15. The method for preparing a display panel according to claim 14, characterized in that: The transmittance T of the semi-transparent area is: 16%≤T≤30%.

16. The method for preparing a display panel according to claim 14, characterized in that: The width W of the semi-transparent area is: 2 micrometers ≤ W ≤ W0; Wherein, W0 represents the width of the vertical projection of the first side surface on the substrate.

17. The method for preparing a display panel according to claim 14, characterized in that: The half-tone mask is provided, comprising: determining a target transmittance and a target width of the semi-transparent area based on an angle between the first side surface and the bottom surface; A half-tone mask having a target transmittance and a target width of the semi-transmissive region is provided.

18. The method for preparing a display panel according to claim 14, characterized in that: Aligning the half-tone mask plate with the base substrate, further comprising: In a direction perpendicular to the plane where the substrate is located, the second groove is located in the impermeable area.

19. A display device, characterized in that: A display panel comprising any one of claims 1 to 11.

Images