Display panel

Abstract

The present application provides a display panel (100). In the display panel (100), a pixel definition layer (30) having different structures of cuts (X) partitions a hole functional layer (50), such that a first hole functional layer (50a) is not in direct contact with anode electrodes (21), so as to prevent the hole functional layer (50) from being in contact with a conductive part (41) of a conductive isolation structure (40) during evaporation deposition, reducing the occurrence of short circuit phenomena, and obviating the need to use the conductive isolation structure (40) for controlling the evaporation angle (Z) of the hole functional layer (50).

Description

Display panel

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2024101388041 filed on January 30, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of display technology, and in particular to a display panel. Background Art

[0004] When an existing display panel adopts a conductive isolation structure, the cathode electrode needs to be interconnected by contacting the conductive part of the conductive isolation structure. In this case, in order to avoid the hole transport layer contacting the conductive part of the conductive isolation structure during evaporation, resulting in the hole transport layer being directly electrically connected to the cathode electrode through the conductive part and causing a short circuit, it is necessary to control the evaporation angles of the hole transport layer, the light-emitting layer and the cathode electrode; among which, the hole transport layer cannot contact the conductive part of the conductive isolation structure.

[0005] In the existing technology, the evaporation angles of the hole transport layer, the light-emitting layer and the cathode electrode are required to be different, which places high demands on the stability and uniformity of the conductive isolation structure; the conductive isolation structure needs to take into account the precision requirements of the evaporation angles of the three layers, which makes it difficult to control the evaporation angle of the hole transport layer and increases the difficulty of the process; at the same time, the evaporation angle of the hole transport layer needs to be very small, and for expensive organic materials, the material utilization rate is very low. Summary of the Invention

[0006] The main technical problem solved by this application is to provide a display panel to solve the technical problem that the existing display panel needs to control the hole functional layer through a conductive isolation structure, which increases the difficulty of the process. At the same time, the evaporation angle of the hole functional layer is very small, and for expensive organic materials, the material utilization rate is very low.

[0007] To solve the above technical problems, the first technical solution adopted in this application is to provide a display panel, comprising:

[0008] Driver substrate;

[0009] A first electrode layer is provided on one side surface of the driving substrate and includes a plurality of anode electrodes arranged at intervals;

[0010] a pixel definition layer, disposed on one side of the driving substrate, the pixel definition layer having a plurality of openings, wherein the openings expose the anode electrodes;

[0011] a conductive isolation structure, disposed on the pixel definition layer and surrounding a side of the opening away from the driving substrate;

[0012] a hole functional layer, disposed in the opening and partially extending to a surface of the pixel definition layer away from the driving substrate;

[0013] The pixel definition layer is a single-layer structure; or

[0014] The pixel definition layer is a multi-layer structure with two or more layers;

[0015] In which, the pixel definition layer has a cutout, and the hole functional layer is separated at the cutout position of the pixel definition layer, so that the hole functional layer is separated into a first hole functional layer and a second hole functional layer. The first hole functional layer is closer to the conductive isolation structure than the second hole functional layer. The first hole functional layer and the anode electrode are not in direct contact, and the second hole functional layer is in direct contact with the anode electrode.

[0016] Wherein, when the pixel definition layer has a two-layer structure, the pixel definition layer includes a first definition layer and a second definition layer stacked in sequence; the incision is provided in the same layer as the second definition layer and corresponds to an edge of a side surface of the first definition layer away from the drive substrate;

[0017] When the pixel definition layer has a three-layer structure, the pixel definition layer includes a first definition layer, a second definition layer, and a third definition layer stacked in sequence; the incision is provided in the same layer as the second definition layer, and corresponds to an edge of the first definition layer on a side away from the driving substrate, and corresponds to an edge of the third definition layer on a side close to the driving substrate;

[0018] Wherein, when the pixel definition layer has a two-layer structure or a three-layer structure, the hole functional layer is separated at the position of the second definition layer and is divided into the first hole functional layer and the second hole functional layer.

[0019] When the pixel definition layer has a two-layer structure or a three-layer structure, the cross-sectional shape of the second definition layer is a rectangle or an inverted trapezoid.

[0020] Wherein, when the pixel definition layer is a two-layer structure, the material of the first definition layer is different from the material of the second definition layer;

[0021] When the pixel definition layer has a three-layer structure, the materials of the first definition layer, the second definition layer, and the third definition layer are all different; or

[0022] The material of the first defining layer is the same as that of the third defining layer, and the material of the second defining layer is different from that of the first defining layer and the third defining layer.

[0023] Wherein, the materials of the first defining layer, the second defining layer and the third defining layer are at least one of SiOx, SiOxNx and SiNx;

[0024] or,

[0025] The first defining layer, the second defining layer, and the third defining layer are all made of organic materials.

[0026] Wherein, when the pixel definition layer has a two-layer structure, the length of the second definition layer on a side surface close to the driving substrate is shorter than the length of the first definition layer on a side surface away from the driving substrate;

[0027] When the pixel definition layer is a three-layer structure, the length of the second definition layer on the side surface away from the driving substrate is smaller than the length of the third definition layer on the side surface close to the driving substrate, and the length of the second definition layer on the side surface close to the driving substrate is smaller than the length of the first definition layer on the side surface away from the driving substrate.

[0028] When the pixel definition layer has a two-layer structure, the evaporation angle of the hole functional layer is smaller than the angle formed by the line connecting the bottom edge of the first definition layer and the top edge of the second definition layer and the straight line perpendicular to the display panel;

[0029] Wherein, the evaporation angle of the hole functional layer is greater than fifty degrees;

[0030] When the pixel definition layer has a three-layer structure, the evaporation angle of the hole functional layer is smaller than the angle formed by the line connecting the bottom edge of the first definition layer and the top edge of the third definition layer and the straight line perpendicular to the display panel;

[0031] The angle formed by a line connecting an edge of the bottom of the first defining layer and an edge of the top of the third defining layer and a straight line perpendicular to the display panel is greater than fifty degrees.

[0032] Among them, when the pixel definition layer is a three-layer structure, the connecting angle between the bottom of the third defining layer and the bottom of the first defining layer, the connecting angle between the top of the second defining layer and the bottom of the first defining layer, and the connecting angle between the bottom of the second defining layer and the bottom of the first defining layer are all greater than fifty degrees.

[0033] When the pixel definition layer is a three-layer structure or a multi-layer structure with more than three layers, the evaporation angle of the hole functional layer is smaller than the angle formed by the line connecting the edge of the bottom of the first definition layer and the edge of the bottom of the third definition layer and the straight line perpendicular to the display panel;

[0034] The angle formed by a line connecting an edge of the bottom of the first defining layer and an edge of the bottom of the third defining layer and a straight line perpendicular to the display panel is greater than fifty degrees.

[0035] The cutout is located on a side of the pixel definition layer away from the drive substrate, and the hole functional layer is separated at the position of the cutout to be divided into the first hole functional layer and the second hole functional layer.

[0036] The orthographic projection of the cutout on the driving substrate is located at an edge of the orthographic projection of the conductive isolation structure on the driving substrate and is not covered by the orthographic projection of the conductive isolation structure.

[0037] Wherein, the display panel further includes:

[0038] a light-emitting layer, disposed on a side of the first electrode layer away from the driving substrate;

[0039] a second electrode layer, disposed on a side of the light-emitting layer away from the driving substrate, and partially contacting and conducting with the conductive isolation structure;

[0040] The hole functional layer includes a hole transport layer and a hole injection layer;

[0041] The first electrode layer, the hole functional layer, the light-emitting layer and the second electrode layer stacked in sequence constitute a sub-pixel; the incision is arranged around the sub-pixel to separate the hole functional layer into two parts in all directions of the sub-pixel.

[0042] Wherein, in a direction perpendicular to the driving substrate, the depth of the cutout is less than the sum of the thicknesses of the light-emitting layer and the hole transport layer, and the depth of the cutout is greater than the thickness of the hole transport layer.

[0043] Wherein, the display panel further includes:

[0044] a light-emitting layer, disposed on a side of the first electrode layer away from the driving substrate;

[0045] a second electrode layer, disposed on a side of the light-emitting layer away from the driving substrate, and partially contacting and conducting with the conductive isolation structure;

[0046] Wherein, the hole functional layer includes a hole transport layer and a hole injection layer;

[0047] When the pixel definition layer is a multi-layer structure of two or more layers, the thickness of the second definition layer is less than the sum of the thicknesses of the light-emitting layer and the hole transport layer, and the thickness of the second definition layer is greater than the thickness of the hole transport layer.

[0048] Wherein, the thickness of the second defining layer is greater than 30 angstroms and less than 2600 angstroms.

[0049] The beneficial effects of the present application are as follows: different from the prior art, a display panel is provided. The display panel includes a driving substrate; a first electrode layer is provided on one side surface of the driving substrate, including a plurality of spaced anode electrodes; a pixel definition layer is provided on one side of the driving substrate, and has a plurality of openings, wherein the openings expose the anode electrodes; a conductive isolation structure is provided on the pixel definition layer and surrounds a side of the opening away from the driving substrate; a hole functional layer is provided in the opening and partially extends to a side surface of the pixel definition layer away from the driving substrate; the pixel definition layer is a single-layer structure; or the pixel definition layer is a multi-layer structure with two or more layers; the pixel definition layer has a cutout, and the hole functional layer is separated at the cutout position of the pixel definition layer, so that the hole functional layer is separated into a first hole functional layer and a second hole functional layer, the first hole functional layer is closer to the conductive isolation structure than the second hole functional layer, the first hole functional layer and the anode electrode are not in direct contact, and the second hole functional layer and the anode electrode are in direct contact. The display panel separates the hole functional layer through a pixel definition layer with different incision structures, so that the first hole functional layer and the anode electrode are not in direct contact, thereby avoiding the hole functional layer contacting the conductive part of the conductive isolation structure during evaporation, reducing the probability of short circuit occurrence, and eliminating the need to use a conductive isolation structure to control the evaporation angle of the hole functional layer, thereby improving material utilization, reducing process difficulty, and increasing preparation stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. 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.

[0051] FIG1 is a schematic diagram of the specific structure of a display panel provided in one embodiment of the present application;

[0052] FIG2 is a schematic diagram showing a partial structure of a display panel having a two-layer structure of pixel definition layers according to an embodiment of the present application;

[0053] FIG3 is a simplified diagram of the shapes of the first defining layer and the second defining layer in FIG2 ;

[0054] FIG4 is a schematic diagram showing the formation of a vapor deposition shadow at the opening in FIG2 ;

[0055] FIG5 is a simplified diagram showing the shapes of the first defining layer, the second defining layer, and the third defining layer in FIG1;

[0056] FIG6 is a schematic diagram showing the formation of a vapor deposition shadow at the opening in FIG1 ;

[0057] FIG7 is a schematic diagram of a partial structure of a display panel provided in an embodiment of the present application, in which a pixel definition layer is provided with a cutout on a side away from a driving substrate;

[0058] FIG8 is a schematic top view of a pixel definition layer provided in an embodiment of the present application, showing a cutout provided on a side away from the driving substrate.

[0059] Explanation of the accompanying drawings: 10-driving substrate; 20-first electrode layer; 21-anode electrode; 30-pixel definition layer; 30a-opening; 31-first definition layer; 32-second definition layer; 33-third definition layer; 40-conductive isolation structure; 41-conductive part; 42-top; 50-hole functional layer; 50a-first hole functional layer; 50b-second hole functional layer; 60-light-emitting layer; 70-second electrode layer; 80-organic partition layer; 90-evaporation shadow; 100-display panel; X-incision; Y-sub-pixel; Z-evaporation angle. DETAILED DESCRIPTION

[0060] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0061] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0062] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0063] The terms "first," "second," and "third" in this application are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of such features. In the description of this application, "multiple" means at least two, for example, two, three, etc., unless otherwise specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications also change accordingly. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0064] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0065] When existing display panels use a conductive isolation structure, the cathode electrodes must interconnect by contacting the conductive portion of the conductive isolation structure. To prevent the hole-functional layer from contacting the conductive portion of the conductive isolation structure during vapor deposition, which could result in a direct electrical connection between the hole-functional layer and the cathode electrode through the conductive portion and cause a short circuit. This could also cause lateral current flow between pixels, leading to the adjacent pixel being lit up, and therefore, the vapor deposition angles of the hole-functional layer, light-emitting layer, and cathode electrode must be controlled. The hole-functional layer must not contact the conductive portion of the conductive isolation structure.

[0066] In the prior art, the evaporation angles of the hole functional layer, the light-emitting layer, and the cathode electrode are required to be different, which places high demands on the stability and uniformity of the conductive isolation structure; the conductive isolation structure needs to take into account the precision requirements of the evaporation angles of the hole functional layer, the light-emitting layer, and the cathode electrode, which makes it difficult to control the evaporation angle of the hole functional layer, increasing the process difficulty; at the same time, the evaporation angle of the hole functional layer needs to be very small, and for expensive organic materials, the material utilization rate is very low. In order to solve these problems, a new pixel definition layer (PDL) structure is designed, in which an incision is formed in the pixel definition layer through an etching process, such as an undercut, and then a partition is created in the hole functional layer above the pixel definition layer at the undercut position, dividing the hole functional layer into a first hole functional layer and a second hole functional layer. The conductive isolation structure does not need to separately control the hole functional layer, so that the hole functional layer in contact with the first electrode layer will not directly contact the conductive part of the conductive isolation structure.

[0067] The present application provides a display panel. The display panel includes a drive substrate; a first electrode layer disposed on a side surface of the drive substrate and including a plurality of spaced-apart anode electrodes; a pixel definition layer disposed on one side of the drive substrate and having a plurality of openings, wherein the openings expose the anode electrodes; a conductive isolation structure disposed on the pixel definition layer and surrounding a side of the openings away from the drive substrate; a hole functional layer disposed within the openings and partially extending to a side surface of the pixel definition layer away from the drive substrate; the pixel definition layer being a single-layer structure; or the pixel definition layer being a multi-layer structure of two or more layers; and the hole functional layer being interrupted at the position of the pixel definition layer so that the hole functional layer is separated into a first hole functional layer and a second hole functional layer in a direction parallel to a light-emitting surface of the display panel, wherein the first hole functional layer is not in direct contact with the anode electrodes, and the second hole functional layer is in direct contact with the anode electrodes. The display panel separates the hole functional layer through pixel definition layers of different structures, so that the first hole functional layer and the anode electrode are not in direct contact, and the second hole functional layer is in direct contact with the anode electrode. This avoids the hole functional layer from contacting the conductive part of the conductive isolation structure during evaporation, further avoids contact between the hole functional layer and the cathode electrode, reduces the probability of short circuit, and eliminates the need to use a conductive isolation structure to control the evaporation angle of the hole functional layer, thereby improving material utilization, reducing process difficulty, and increasing preparation stability.

[0068] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0069] Please refer to Figure 1, which is a schematic diagram of the specific structure of a display panel provided in an embodiment of the present application. The present application provides a display panel 100, which includes a driving substrate 10, a first electrode layer 20, a pixel definition layer 30, a conductive isolation structure 40, and a hole functional layer 50. The driving substrate 10 is used to drive the light-emitting layer 60 to emit light. The first electrode layer 20 is arranged on a side surface of the driving substrate 10 and includes a plurality of anode electrodes 21 arranged at intervals. The pixel definition layer 30 is arranged on one side of the driving substrate 10. The pixel definition layer 30 has a plurality of openings 30a, and the openings 30a expose the anode electrodes 21. The conductive isolation structure 40 is arranged on the pixel definition layer 30 and surrounds the side of the opening 30a away from the driving substrate 10. The conductive isolation structure 40 includes a conductive portion 41 and a top portion 42. The hole functional layer 50 is arranged in the opening 30a and partially extends to the side surface of the pixel definition layer 30 away from the driving substrate 10. The hole functional layer 50 is used to increase the hole transmission rate in the device so that the hole transmission rate and the electron transmission rate are balanced.

[0070] The pixel definition layer 30 has a multi-layer structure with two or more layers; that is, the pixel definition layer 30 can have a two-layer structure, a three-layer structure, or a multi-layer structure with three or more layers. The pixel definition layer 30 has a cutout X, and the hole functional layer 50 is separated at the cutout X in the pixel definition layer 30, so that the hole functional layer 50 is separated into a first hole functional layer 50a and a second hole functional layer 50b in a direction parallel to the light-emitting surface of the display panel 100. The first hole functional layer 50a is closer to the conductive isolation structure 40 than the second hole functional layer 50b. The first hole functional layer 50a does not directly contact the anode electrode 21, while the second hole functional layer 50b directly contacts the anode electrode 21. In a specific embodiment, the hole functional layer 50 is isolated at the cutout X position of the pixel definition layer 30, which means that an undercut is formed at a position of the pixel definition layer 30 near the conductive isolation structure 40 through an etching process. The hole functional layer 50 is subjected to a fault at the step structure of the undercut during evaporation, thereby being separated into a first hole functional layer 50a and a second hole functional layer 50b.

[0071] It is understood that the first hole functional layer 50a and the anode electrode 21 are not in direct contact in a physical sense, but are in electrical contact. Furthermore, the above description can also be understood as meaning that the first hole functional layer 50a is in direct contact with the conductive portion 41 of the conductive isolation structure 40, while the second hole functional layer 50b is not in direct contact with the conductive portion 41 of the conductive isolation structure 40.

[0072] Referring further to FIG. 1 , the display panel 100 further includes a light-emitting layer 60 and a second electrode layer 70 . The light-emitting layer 60 is disposed on the side of the first electrode layer 20 away from the drive substrate 10 , that is, the light-emitting layer 60 is disposed within the opening 30 a . Specifically, the conductive isolation structure 40 separates the light-emitting layer 60 to prevent crosstalk between pixels. The second electrode layer 70 is disposed on the side of the light-emitting layer 60 away from the drive substrate 10 and is partially in contact with and electrically conductive to the conductive isolation structure 40 . The second electrode layer 70 is a cathode electrode. The hole-functional layer 50 includes a hole injection layer (not shown) and a hole transport layer (not shown) stacked in sequence, or the hole-functional layer 50 may include only the hole injection layer. The hole injection layer and the first electrode layer 20 are energy-level matched, allowing holes from the anode electrode 21 to enter smoothly and then be transported to the light-emitting layer 60 via the hole transport layer, thereby enhancing electron injection and transport capabilities. Furthermore, the light-emitting layer 60 is disposed on the side of the hole-functional layer 50 away from the drive substrate 10 .

[0073] In the prior art, when a conductive isolation structure 40 is used, the second electrode layer 70 needs to be interconnected by contacting the conductive portion 41 of the conductive isolation structure 40. However, if the hole functional layer 50 directly contacts the conductive portion 41 of the conductive isolation structure 40, it may cause a short circuit between the second electrode layer 70. In the present application, the hole functional layer 50 is separated at the position of the pixel definition layer 30, and is separated into a first hole functional layer 50a and a second hole functional layer 50b, so that the first hole functional layer 50a and the anode electrode 21 are not in direct contact. This means that structurally, the second hole functional layer 50b and the conductive portion 41 of the conductive isolation structure 40 are also not in direct contact.

[0074] The separation of the first hole functional layer 50a and the second hole functional layer 50b eliminates the problem of direct contact between the first hole functional layer 50a and the anode electrode 21 during the manufacturing process. This means that there is no need to worry about the second hole functional layer 50b contacting the conductive portion 41 of the conductive isolation structure 40. This further avoids contact between the second hole functional layer 50b and the cathode electrode, thereby reducing the probability of short circuits. Furthermore, compared to the prior art, the display panel 100 of this application does not require a conductive isolation structure 40 to control the evaporation angle of the hole functional layer 50, thereby improving material utilization, reducing process difficulty, and increasing the stability of the display panel 100. FIG. 1 of this application primarily illustrates a three-layer structure of the pixel definition layer 30.

[0075] Please refer to Figures 2 to 4. Figure 2 is a schematic diagram of a partial structure of a display panel with a two-layer pixel definition layer provided in an embodiment of the present application. Figure 3 is a schematic diagram of the shape of the first definition layer and the second definition layer in Figure 2. Figure 4 is a schematic diagram of the vapor deposition shadow formed at the opening in Figure 2. In this embodiment, the pixel definition layer 30 has a two-layer structure. When the pixel structure is a two-layer structure, the pixel definition layer 30 includes a first definition layer 31 and a second definition layer 32 stacked in sequence. In this structure, the hole function layer 50 is separated at the position of the cutout X in the second definition layer 32, and is separated into a first hole function layer 50a and a second hole function layer 50b, so that the first hole function layer 50a and the anode electrode 21 are not in direct contact, and the second hole function layer 50b is in direct contact with the anode electrode 21. The cutout X of the second definition layer 32 is arranged on the same layer as the second definition layer 32 and corresponds to the edge of the first definition layer 31 on the side surface away from the drive substrate 10. The first hole functional layer 50a and the anode electrode 21 are not in direct contact, reducing the probability of short circuits. In a specific embodiment, the material of the first defining layer 31 is different from the material of the second defining layer 32. The material of the first defining layer 31 is at least one of SiOx, SiOxNx, and SiNx. The material of the second defining layer 32 is at least one of SiOx, SiOxNx, and SiNx. It should be understood that the aforementioned material difference between the first defining layer 31 and the second defining layer 32 refers to the requirement that the material of the first defining layer 31 and the material of the second defining layer 32 are different within the same embodiment. In actual manufacturing, the material of the first defining layer 31 and the material of the second defining layer 32 are different. In other embodiments where the pixel definition layer 30 is a two-layer structure, the material of the first defining layer 31 and the second defining layer 32 can also be an organic material. For example, the material of the first defining layer 31 is a PI-based organic material or an acrylic-based organic material. The second defining layer 32 can also be at least one of a polyimide-based material.

[0076] The length of the second defining layer 32 on the side closest to the drive substrate 10 is less than the length of the first defining layer 31 on the side away from the drive substrate 10. Furthermore, the evaporation angle Z of the hole functional layer 50 is required to be less than the angle formed by a line connecting the bottom edge of the first defining layer 31 and the top edge of the second defining layer 32 and a line perpendicular to the display panel 100. This arrangement is intended to separate the hole functional layer 50 at the location of the second defining layer 32, so that the hole functional layer 50 is separated into a first hole functional layer 50a and a second hole functional layer 50b in a direction parallel to the light-emitting surface of the display panel 100. Otherwise, a evaporation shadow 90 would be formed at the opening 30a of the pixel definition layer 30, resulting in a reduction in the area of ​​the light-emitting surface of the display panel 100 and thus affecting the display effect of the display panel 100. Specifically, the evaporation angle Z of the hole functional layer 50 is greater than 50 degrees. For example, the evaporation angle Z of the hole functional layer 50 can be 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees, etc. Specifically, the second defining layer 32 may be in the shape of a rectangle or an inverted trapezoid. It should be noted that, regardless of whether it is a rectangle or an inverted trapezoid, in this embodiment, the length of the second defining layer 32 on the side close to the drive substrate 10 must be less than the length of the first defining layer 31 on the side away from the drive substrate 10.

[0077] The thickness of the second defining layer 32 is less than the sum of the thicknesses of the light-emitting layer 60 and the hole transport layer (see FIG1 ), and the thickness of the second defining layer 32 is greater than the thickness of the hole transport layer. Specifically, the thickness of the second defining layer 32 is greater than 30 angstroms and less than 2600 angstroms. For example, in this embodiment, the thickness of the second defining layer 32 can be 40 angstroms, 100 angstroms, 400 angstroms, 800 angstroms, 1200 angstroms, 1600 angstroms, 2000 angstroms, 2400 angstroms, etc. In a specific embodiment, if the light-emitting layer 60 of the display panel 100 is a single layer, the thickness of the second defining layer 32 in the display panel 100 is less than the sum of the thicknesses of the light-emitting layer 60 and the hole transport layer (see FIG1 ), and the thickness of the second defining layer 32 is greater than the thickness of the hole transport layer. If the light-emitting layer 60 is a multi-layer structure, the thickness of the second defining layer 32 in the display panel 100 is less than the sum of the thicknesses of the light-emitting layer 60 and the multi-layer hole transport layer, and the thickness of the second defining layer 32 is greater than the thickness of the multi-layer hole transport layer.

[0078] Please refer to Figures 1, 5, and 6. Figure 1 is also a schematic diagram of the partial structure of a display panel with a three-layer structure of a pixel definition layer provided in an embodiment of the present application. Figure 5 is a schematic diagram of the shapes of the first definition layer, the second definition layer, and the third definition layer in Figure 1. Figure 6 is a schematic diagram of the formation of an evaporation shadow at the opening in Figure 1. The structure of the display panel 100 in this embodiment is basically the same as the structure in the above embodiment, except that the pixel definition layer 30 in this embodiment has a three-layer structure. The pixel definition layer 30 includes a first definition layer 31, a second definition layer 32, and a third definition layer 33, which are stacked in sequence. Among them, the hole function layer 50 is separated at the incision X position of the second definition layer 32, and is separated into a first hole function layer 50a and a second hole function layer 50b, so that the first hole function layer 50a and the anode electrode 21 are not in direct contact, and the second hole function layer 50b is in direct contact with the anode electrode 21. The cutout X of the second defining layer 32 is provided in the same layer as the second defining layer 32 and corresponds to the edge of the first defining layer 31 on the side away from the drive substrate 10, and corresponds to the edge of the third defining layer 33 on the side close to the drive substrate 10. The first hole functional layer 50a and the anode electrode 21 are not in direct contact, thereby reducing the probability of a short circuit.

[0079] In a specific embodiment, the materials of the first defining layer 31, the second defining layer 32, and the third defining layer 33 are all different; alternatively, the material of the first defining layer 31 and the third defining layer 33 are the same, while the material of the second defining layer 32 is different from the materials of the first and third defining layers 31, 33. It can be understood that, in the actual manufacturing process, it is sufficient to ensure that the material of the second defining layer 32 is different from the materials of the first and third defining layers 31, 33. Specifically, the material of the first, second, and third defining layers 31, 32, 33 is at least one of SiOx, SiOxNx, and SiNx. In other embodiments in which the pixel definition layer 30 comprises three layers, the materials of the first, second, and third defining layers 31, 32, 33 can also be organic materials. For example, the material of the first defining layer 31 can be a PI-based organic material or an acrylic-based organic material. The second and third defining layers 32, 33 can also be at least one of polyimide-based materials. It can be understood that the material of the second defining layer 32 mentioned above is different from the materials of the first defining layer 31 and the third defining layer 33, which means that in the same embodiment, it is only necessary to ensure that the material of the second defining layer 32 is different from the materials of the first defining layer 31 and the third defining layer 33.

[0080] The length of the side surface of the second defining layer 32 away from the driving substrate 10 is smaller than the length of the side surface of the third defining layer 33 close to the driving substrate 10, and the length of the side surface of the second defining layer 32 close to the driving substrate 10 is smaller than the length of the side surface of the first defining layer 31 away from the driving substrate 10. At the same time, the evaporation angle Z of the hole functional layer 50 is required to be smaller than the angle formed by the line connecting the bottom edge of the first defining layer 31 and the top edge of the third defining layer 33 and the straight line perpendicular to the display panel 100; this arrangement is to separate the hole functional layer 50 at the position of the second defining layer 32, so that the hole functional layer 50 is separated into the first hole functional layer 50a and the second hole functional layer 50b in the direction parallel to the light-emitting surface of the display panel 100, otherwise a evaporation shadow 90 (shadow) will be formed at the opening 30a of the pixel definition layer 30, which will cause the area of ​​the light-emitting surface of the display panel 100 to be reduced, thereby affecting the display effect of the display panel 100. The angle formed between the line connecting the bottom edge of the first defining layer 31 and the top edge of the third defining layer 33 and a line perpendicular to the display panel 100 is greater than 50 degrees. The angles of the line connecting the top of the third defining layer 33 and the bottom of the first defining layer 31, the line connecting the bottom of the third defining layer 33 and the bottom of the first defining layer 31, the line connecting the top of the second defining layer 32 and the bottom of the first defining layer 31, and the line connecting the bottom of the second defining layer 32 and the bottom of the first defining layer 31 are all greater than 50 degrees. For example, the angles may be 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees, etc. Similar to the above embodiment, the shape of the second defining layer 32 may be rectangular or inverted trapezoidal. Specifically, the thickness range of the second defining layer 32 is the same as that in the embodiment in which the pixel definition layer 30 has a two-layer structure and is not further described here.

[0081] It should be noted that the top refers to the side surface away from the drive substrate 10, and the bottom refers to the side surface close to the drive substrate 10. The connection angle can be understood as the angle formed between the connection line between the two surface edges in the pixel definition layer 30 and the straight line perpendicular to the display panel 100; wherein, the connection line between the surface edges refers to the connection line between the edges of different surfaces located on the same side, rather than the connection line between the edges of different surfaces located on different sides. For example, the connection angle between the top of the third defining layer 33 and the bottom of the first defining layer 31 can be understood as the connection angle between the edge of the top of the third defining layer 33 and the edge of the bottom of the first defining layer 31, and the edge of the top of the third defining layer 33 and the edge of the bottom of the first defining layer 31 are located on the same side.

[0082] In a specific embodiment, the pixel definition layer 30 may also have a three-layer structure or a multi-layer structure with three or more layers, wherein the structure of the display panel 100 is substantially the same as that of the above-described embodiment, except that the number of layers of the pixel definition layer 30 is different. Specifically, the remaining structure is substantially the same as that of the above-described embodiment and is not further described here. When the pixel definition layer 30 has a three-layer structure or a multi-layer structure with three or more layers, the evaporation angle Z of the hole functional layer 50 is less than the angle formed by the line connecting the bottom edge of the first defining layer 31 and the bottom edge of the third defining layer 33 and a line perpendicular to the display panel 100, and the angles of the line connecting the top of the third defining layer 33 and the bottom of the first defining layer 31, the line connecting the bottom of the third defining layer 33 and the bottom of the first defining layer 31, the line connecting the top of the second defining layer 32 and the bottom of the first defining layer 31, and the line connecting the bottom of the second defining layer 32 and the bottom of the first defining layer 31 are all greater than fifty degrees; wherein the angle formed by the line connecting the bottom edge of the first defining layer 31 and the bottom edge of the third defining layer 33 and a line perpendicular to the display panel 100 is greater than fifty degrees. This arrangement is to separate the hole functional layer 50 at the position of the pixel definition layer 30 into a first hole functional layer 50a and a second hole functional layer 50b, so that the first hole functional layer 50a and the anode electrode 21 are not in direct contact. This also means that the second hole functional layer 50b and the conductive portion 41 of the conductive isolation structure 40 are not in direct contact in terms of structure, thereby reducing the probability of short circuits. Since the first hole functional layer 50a and the second hole functional layer 50b are separated, there is no need to worry about the second hole functional layer 50b contacting the conductive portion 41 of the conductive isolation structure 40, further avoiding contact between the second hole functional layer 50b and the cathode electrode, thereby reducing the probability of short circuits. At the same time, compared to the prior art, the display panel 100 of this application does not need to use a conductive isolation structure 40 to control the evaporation angle of the hole functional layer 50, thereby improving material utilization, reducing process difficulty, and increasing the stability of the display panel 100.

[0083] Please refer to Figures 7 and 8. Figure 7 is a schematic diagram of a portion of the structure of a display panel according to an embodiment of the present application, wherein a pixel definition layer is provided with a cutout on the side away from the drive substrate. Figure 8 is a schematic top view of a pixel definition layer provided with a cutout on the side away from the drive substrate according to an embodiment of the present application. The structure of the display panel 100 in this embodiment is substantially the same as that in any of the above-described embodiments, except that the position of the cutout X in the pixel definition layer 30 in this embodiment is different from that in the above-described embodiments. The pixel definition layer 30 provided in this embodiment may also be a single-layer structure, or a multi-layer structure with two or more layers. When there is only one pixel definition layer 30, the cutout X is provided on the side away from the drive substrate 10 to also block the hole functional layer 50. In other words, the cutout X is located on the surface of the pixel definition layer 30 away from the drive substrate 10. This embodiment is mainly described in detail using an example in which the pixel definition layer 30 is three layers (including a first definition layer 31, a second definition layer 32, and a third definition layer 33 stacked in sequence). The hole functional layer 50 is separated at the location of the cutout X into a first hole functional layer 50a and a second hole functional layer 50b, so that the first hole functional layer 50a is not in direct contact with the anode electrode 21, while the second hole functional layer 50b is in direct contact with the anode electrode 21. Specifically, the orthographic projection of the cutout X of the pixel definition layer 30 on the drive substrate 10 is located at the edge of the orthographic projection of the conductive isolation structure 40 on the drive substrate 10 and is not covered by the orthographic projection of the conductive isolation structure 40.

[0084] The cutout X extends from a surface of the pixel definition layer 30 away from the driving substrate 10 toward a surface of the first definition layer 31 close to the driving substrate 10 .

[0085] In the direction perpendicular to the drive substrate 10, the depth of the incision X is less than the sum of the thicknesses of the light-emitting layer 60 and the hole transport layer (refer to Figure 1), and the depth of the incision X is greater than the thickness of the hole transport layer, so that the hole functional layer 50 can be separated at the position of the incision X and separated into the first hole functional layer 50a and the second hole functional layer 50b.

[0086] Among them, the first hole functional layer 50a and the anode electrode 21 are not in direct contact, reducing the probability of short circuit. It is understandable that during the preparation process, the etching process of the incision X and the opening 30a in this embodiment is different, so two exposure processes are required. The first electrode layer 20, the hole functional layer 50, the light-emitting layer 60 and the second electrode layer 70 stacked in sequence constitute the sub-pixel Y. Referring to Figure 8, when viewed from above, the incision X is set around the sub-pixel Y to separate the hole functional layer 50 into two parts in all directions of the sub-pixel Y, reducing the risk of short circuit.

[0087] In a specific embodiment, the materials of the first defining layer 31, the second defining layer 32, and the third defining layer 33 are all different; or, the material of the first defining layer 31 and the material of the third defining layer 33 are the same, while the material of the second defining layer 32 is different from the materials of the first and third defining layers 31, 33. It is understood that, during the actual preparation process, it is sufficient to ensure that the material of the second defining layer 32 is different from the materials of the first and third defining layers 31, 33. Specifically, the material of the first, second, and third defining layers 31, 32, 33 is at least one of SiOx, SiOxNx, and SiNx. It is understood that the aforementioned material of the second defining layer 32 being different from the materials of the first and third defining layers 31, 33 means that within the same embodiment, the material of the second defining layer 32 need not be the same as the materials of the first and third defining layers 31, 33. In other embodiments in which the pixel definition layer 30 comprises three layers, the materials of the first, second, and third defining layers 31, 32, 33 may also be organic materials. For example, the first defining layer 31 may be made of a PI-based organic material or an acrylic-based organic material. The second defining layer 32 and the third defining layer 33 may also be made of at least one polyimide-based material.

[0088] The thickness of the second defining layer 32 is less than the sum of the thicknesses of the light-emitting layer 60 and the hole transport layer (see FIG1 ), and the thickness of the second defining layer 32 is greater than the thickness of the hole transport layer. Specifically, the thickness of the second defining layer 32 is greater than 30 angstroms and less than 2600 angstroms. For example, in this embodiment, the thickness of the second defining layer 32 can be 40 angstroms, 100 angstroms, 400 angstroms, 800 angstroms, 1200 angstroms, 1600 angstroms, 2000 angstroms, 2400 angstroms, etc.

[0089] In other embodiments, when the cutout X is located on the side of the pixel definition layer 30 away from the driving substrate 10 , the pixel definition layer 30 may also be a single-layer or double-layer structure, which can reduce the number of film layers of the pixel definition layer 30 and simplify the process.

[0090] Compared with the above-mentioned embodiment, the provision of the cutout X in the pixel definition layer 30 provided in this embodiment eliminates the need to control the evaporation angle Z of the hole functional layer 50, and can more conveniently separate the hole functional layer 50 at the position of the cutout X, thereby reducing the difficulty of the process and further increasing the stability of the display panel 100 manufacturing process.

[0091] The above description is only an implementation method of the present application and does not limit the scope of patent protection of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present application.

Claims

1. A display panel, comprising: Driver substrate; A first electrode layer is provided on one side surface of the driving substrate and includes a plurality of anode electrodes arranged at intervals; a pixel definition layer, disposed on one side of the driving substrate, the pixel definition layer having a plurality of openings, wherein the openings expose the anode electrodes; a conductive isolation structure, disposed on the pixel definition layer and surrounding a side of the opening away from the driving substrate; a hole functional layer, disposed in the opening and partially extending to a surface of the pixel definition layer away from the driving substrate; in, The pixel definition layer is a single-layer structure; or The pixel definition layer is a multi-layer structure with two or more layers; In which, the pixel definition layer has a cutout, and the hole functional layer is separated at the cutout position of the pixel definition layer, so that the hole functional layer is separated into a first hole functional layer and a second hole functional layer. The first hole functional layer is closer to the conductive isolation structure than the second hole functional layer. The first hole functional layer and the anode electrode are not in direct contact, and the second hole functional layer is in direct contact with the anode electrode.

2. The display panel according to claim 1, wherein When the pixel definition layer has a two-layer structure, the pixel definition layer includes a first definition layer and a second definition layer stacked in sequence; the cutout is provided in the same layer as the second definition layer and corresponds to an edge of a surface of the first definition layer away from the drive substrate; When the pixel definition layer has a three-layer structure, the pixel definition layer includes a first definition layer, a second definition layer, and a third definition layer stacked in sequence; the incision is provided in the same layer as the second definition layer, and corresponds to an edge of the first definition layer on a side away from the driving substrate, and corresponds to an edge of the third definition layer on a side close to the driving substrate; Wherein, when the pixel definition layer has a two-layer structure or a three-layer structure, the hole functional layer is separated at the position of the second definition layer and is divided into the first hole functional layer and the second hole functional layer.

3. The display panel according to claim 2, wherein: When the pixel definition layer has a two-layer structure or a three-layer structure, the cross-sectional shape of the second definition layer is a rectangle or an inverted trapezoid.

4. The display panel according to claim 2, wherein: When the pixel definition layer has a two-layer structure, the material of the first definition layer is different from the material of the second definition layer; When the pixel definition layer has a three-layer structure, the materials of the first definition layer, the second definition layer, and the third definition layer are all different; or The material of the first defining layer is the same as that of the third defining layer, and the material of the second defining layer is different from that of the first defining layer and the third defining layer.

5. The display panel according to claim 4, wherein: The materials of the first defining layer, the second defining layer and the third defining layer are at least one of SiOx, SiOxNx and SiNx; or, The first defining layer, the second defining layer, and the third defining layer are all made of organic materials. The display panel according to claim 2 , wherein: When the pixel definition layer has a two-layer structure, the length of the second definition layer on a side close to the driving substrate is shorter than the length of the first definition layer on a side away from the driving substrate; When the pixel definition layer is a three-layer structure, the length of the second definition layer on the side surface away from the driving substrate is smaller than the length of the third definition layer on the side surface close to the driving substrate, and the length of the second definition layer on the side surface close to the driving substrate is smaller than the length of the first definition layer on the side surface away from the driving substrate.

7. The display panel according to claim 6, wherein: When the pixel definition layer has a two-layer structure, the evaporation angle of the hole functional layer is smaller than the angle formed by the line connecting the bottom edge of the first definition layer and the top edge of the second definition layer and the straight line perpendicular to the display panel; Wherein, the evaporation angle of the hole functional layer is greater than fifty degrees; When the pixel definition layer has a three-layer structure, the evaporation angle of the hole functional layer is smaller than the angle formed by the line connecting the bottom edge of the first definition layer and the top edge of the third definition layer and the straight line perpendicular to the display panel; The angle formed by a line connecting an edge of the bottom of the first defining layer and an edge of the top of the third defining layer and a straight line perpendicular to the display panel is greater than fifty degrees.

8. The display panel according to claim 7, wherein: When the pixel definition layer is a three-layer structure, the connecting angle between the bottom of the third defining layer and the bottom of the first defining layer, the connecting angle between the top of the second defining layer and the bottom of the first defining layer, and the connecting angle between the bottom of the second defining layer and the bottom of the first defining layer are all greater than fifty degrees.

9. The display panel according to claim 2, wherein: When the pixel definition layer is a three-layer structure or a multi-layer structure with three or more layers, the evaporation angle of the hole functional layer is smaller than the angle formed by the line connecting the bottom edge of the first definition layer and the bottom edge of the third definition layer and the straight line perpendicular to the display panel; The angle formed by a line connecting an edge of the bottom of the first defining layer and an edge of the bottom of the third defining layer and a straight line perpendicular to the display panel is greater than fifty degrees.

10. The display panel according to claim 1, wherein The cutout is located on a side of the pixel definition layer away from the drive substrate, and the hole functional layer is separated at the position of the cutout to be divided into the first hole functional layer and the second hole functional layer.

11. The display panel according to claim 10, wherein: The orthographic projection of the cutout on the driving substrate is located at an edge of the orthographic projection of the conductive isolation structure on the driving substrate and is not covered by the orthographic projection of the conductive isolation structure.

12. The display panel according to claim 11, wherein: The display panel further includes: a light-emitting layer, disposed on a side of the first electrode layer away from the driving substrate; a second electrode layer, disposed on a side of the light-emitting layer away from the driving substrate, and partially contacting and conducting with the conductive isolation structure; The hole functional layer includes a hole transport layer and a hole injection layer; The first electrode layer, the hole functional layer, the light-emitting layer and the second electrode layer stacked in sequence constitute a sub-pixel; the incision is arranged around the sub-pixel to separate the hole functional layer into two parts in all directions of the sub-pixel.

13. The display panel according to claim 12, wherein: In a direction perpendicular to the driving substrate, the depth of the cutout is less than the sum of the thicknesses of the light emitting layer and the hole transport layer, and the depth of the cutout is greater than the thickness of the hole transport layer.

14. The display panel according to claim 2, wherein: The display panel further includes: a light-emitting layer, disposed on a side of the first electrode layer away from the driving substrate; a second electrode layer, disposed on a side of the light-emitting layer away from the driving substrate, and partially contacting and conducting with the conductive isolation structure; Wherein, the hole functional layer includes a hole transport layer and a hole injection layer; When the pixel definition layer is a multi-layer structure of two or more layers, the thickness of the second definition layer is less than the sum of the thicknesses of the light-emitting layer and the hole transport layer, and the thickness of the second definition layer is greater than the thickness of the hole transport layer.

15. The display panel according to claim 2, wherein: The thickness of the second defining layer is greater than 30 angstroms and less than 2600 angstroms.

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