Display panel and electronic device

Abstract

The present application discloses a display panel and an electronic device. The display panel comprises: anodes; and pixel definition layers, wherein each pixel definition layer is arranged between adjacent anodes and part of the pixel definition layer is located on the anodes; each pixel definition layer comprises a first pixel definition layer, second pixel definition layers, and a third pixel definition layer; the first pixel definition layer is arranged between the adjacent anodes; at least parts of the second pixel definition layers are in contact with the first pixel definition layer, and at least parts of the second pixel definition layers are in contact with the anodes; and the third pixel definition layer is arranged on the first pixel definition layer. The third pixel definition layer is arranged on the first pixel definition layer, and therefore, the leakage path of a current necessarily passes over the third pixel definition layer, so that the leakage length is increased. Moreover, the longer the leakage path is, the less likely the electric leakage is to occur, and therefore, the arrangement of the third pixel definition layer can effectively prevent electric leakage.

Description

Display panels and electronic devices Technical Field

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

[0002] White light electroluminescent layers offer significant advantages in high-resolution display products. However, due to the close proximity of adjacent pixels, lateral leakage occurs through the organic light-emitting layer (EL layer), leading to crosstalk. Existing technology uses an inverted T-shaped structure to block portions of the organic film layer to reduce lateral leakage. However, this technology still generates lateral leakage at the edges of the T-shaped structure, causing crosstalk.

[0003] Summary of the Invention

[0004] The main purpose of this application is to provide a display panel, aiming to prevent the display panel from leaking electricity.

[0005] To achieve the above objectives, the present application proposes a display panel, comprising:

[0006] anode;

[0007] a pixel definition layer, the pixel definition layer being disposed between adjacent anodes and partially located on the anodes;

[0008] Among them, the pixel definition layer includes a first pixel definition layer, a second pixel definition layer and a third pixel definition layer, the first pixel definition layer is arranged between adjacent anodes, at least part of the second pixel definition layer is in contact with the first pixel definition layer, and at least part of the second pixel definition layer is in contact with the anode, and the third pixel definition layer is arranged on the first pixel definition layer.

[0009] Optionally, in a cross section of the display panel along a thickness direction, the third pixel definition layer includes a plurality of third pixel definition patterns, and the plurality of third pixel definition patterns are arranged on the first pixel definition layer.

[0010] Optionally, in a cross section of the display panel along a thickness direction, a plurality of the third pixel definition patterns are arranged in parallel, and the third pixel definition patterns are perpendicular to the first pixel definition layer.

[0011] Optionally, in a cross section of the display panel along the thickness direction, the distances between the multiple third pixel definition patterns are equal, and the distance from the third pixel definition pattern closest to the second pixel definition layer to the second pixel definition layer is equal to the distance between the multiple third pixel definition patterns.

[0012] Optionally, the thickness of the third pixel definition layer is greater than or equal to the thickness of the second pixel definition layer.

[0013] Optionally, in a cross section of the display panel along the thickness direction, the first pixel definition layer is arranged in a rectangular shape, and the second pixel definition layer and / or the third pixel definition layer are rectangular, trapezoidal or arc-shaped protrusions.

[0014] Optionally, the material of the first pixel definition layer, the second pixel definition layer and the third pixel definition layer is one or more of silicon nitride, silicon oxide, silicon oxynitride, silicon carbide and photosensitive polyimide.

[0015] Optionally, the first pixel definition layer, the second pixel definition layer and the third pixel definition layer are made of the same or different materials.

[0016] Optionally, the display panel further includes a fourth pixel definition layer, and the fourth pixel definition layer is arranged on the second pixel definition layer.

[0017] Optionally, in a cross section of the display panel along a thickness direction, the third pixel definition layer includes a plurality of third pixel definition patterns, and the plurality of third pixel definition patterns are arranged on the first pixel definition layer.

[0018] Optionally, the materials of the first pixel definition layer, the second pixel definition layer, the third pixel definition layer, and the fourth pixel definition layer are the same or different.

[0019] Optionally, the thickness of the first pixel definition layer is less than or equal to the thickness of the anode.

[0020] Optionally, the display panel further includes

[0021] substrate;

[0022] A driving circuit, wherein the driving circuit is configured on the substrate, and the anodes are arranged on the driving circuit at intervals;

[0023] an electroluminescent layer, the electroluminescent layer being disposed on the pixel definition layer and the anode;

[0024] a cathode, the cathode being disposed on the electroluminescent layer;

[0025] a light extraction layer, the light extraction layer being disposed on the cathode;

[0026] An encapsulation layer cooperates with the substrate to encapsulate the driving circuit, the anode, the pixel definition layer, the electroluminescent layer, the cathode and the light extraction layer.

[0027] To achieve the above objectives, the present application also proposes an electronic device, comprising any one of the display panels described above.

[0028] In the technical solution of this application, since the third pixel definition layer is disposed on the first pixel definition layer, the leakage path of the current must bypass the third pixel definition layer, thereby increasing the length of the leakage path. The longer the leakage path, the less likely leakage will occur. Therefore, the provision of the third pixel definition layer can effectively prevent leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 the structures shown in these drawings without paying any creative work.

[0030] FIG1 is a schematic diagram of the structure of a related display panel.

[0031] 2( a ) to 2 ( e ) are schematic diagrams of a manufacturing process of a display panel in one embodiment of the present application.

[0032] 3( a ) to 3 ( e ) are schematic diagrams of a manufacturing process of a display panel in one embodiment of the present application.

[0033] 4( a ) to 4 ( e ) are schematic diagrams of a manufacturing process of a display panel in one embodiment of the present application.

[0034] 5( a ) to 5 ( e ) are schematic diagrams of a manufacturing process of a display panel in one embodiment of the present application.

[0035] Description of Figure Numbers:

[0036] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0038] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, technical or scientific terms used in this application should have the ordinary meaning understood by a person of ordinary skill in the art to which this application belongs. The use of "a" or "an," and similar terms in this specification and claims does not indicate a limitation of quantity, but rather indicates the presence of at least one. "Multiple" means two or more. "Include" or "comprising," and similar terms mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising," and their equivalents, and do not exclude other elements or objects. "Connected" or "connected," and similar terms are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. "On" and / or "below," and similar terms are for convenience only and are not limited to a single position or spatial orientation. As used in this specification and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0039] White light electroluminescent layers offer significant advantages in high-resolution display products. However, due to the close proximity of adjacent pixels, lateral leakage occurs through the organic light-emitting layer (EL layer), leading to crosstalk. Existing technology uses an inverted T-shaped structure to block portions of the organic film layer to reduce lateral leakage. However, this technology still generates lateral leakage at the edges of the T-shaped structure, causing crosstalk.

[0040] As shown in Figure 1, the pixel definition layer 400 in a conventional T-shaped structure comprises only a first pixel definition layer 410 and a second pixel definition layer 420. Therefore, the only leakage path for current is the depression between the two second pixel definition layers 420, which allows it to reach adjacent pixels and cause leakage. Furthermore, in small-sized pixels, the distance between two pixels is very close, further shortening the leakage path and making leakage even more likely.

[0041] Based on the above reasons, with reference to Figures 2(a) to 2(e), the present application provides a display panel comprising: a substrate 100, a driving circuit 200, an anode 300, a pixel definition layer 400, an electroluminescent layer 500, a cathode 600, a light extraction layer 700, and an encapsulation layer 800. The substrate 100 herein may be a glass or polyimide (PI) substrate; the driving circuit 200 is a circuit unit for controlling the lighting of pixels; the pixel definition layer 400 may be used to define the size and shape of pixels; the electroluminescent layer 500 may typically be an OLED, QLED, or the like; the anode 300 and the cathode 600 are used to conduct the electroluminescent layer 500; the light extraction layer 700 is used to improve the light extraction efficiency of the device; and the encapsulation layer 800 is used to encapsulate the electroluminescent layer 500, thereby preventing water and oxygen from corroding and damaging the device.

[0042] The driving circuit 200 is configured on the substrate 100; the anodes 300 are arranged at intervals on the driving circuit 200; the pixel definition layer 400 is configured between the anodes 300 and partially located on the anode 300; the electroluminescent layer 500 is configured on the pixel definition layer 400 and the anode 300; the cathode 600 is configured on the electroluminescent layer 500; the light extraction layer 700 is set on the cathode 600; the encapsulation layer 800 cooperates with the substrate 100 to encapsulate the driving circuit 200, the anode 300, the pixel definition layer 400, the electroluminescent layer 500, the cathode 600 and the light extraction layer 700.

[0043] In which, the pixel definition layer 400 includes a first pixel definition layer 410, a second pixel definition layer 420 and a third pixel definition layer 430, the first pixel definition layer 410 is arranged between the anodes 300, the second pixel definition layer 420 is at least partially in contact with the first pixel definition layer 410, and the second pixel definition layer 420 is at least partially in contact with the anode 300, and the third pixel definition layer 430 is arranged on the first pixel definition layer 410.

[0044] Because the third pixel definition layer 430 is disposed on the first pixel definition layer 410, the current leakage path must bypass the third pixel definition layer 430, thereby increasing the length of the leakage path. The longer the leakage path, the less likely leakage will occur. Therefore, the third pixel definition layer 430 can effectively prevent leakage.

[0045] In this embodiment, referring to Figures 2(a) to 2(e), the display panel manufacturing process of this embodiment is as follows: First, a driving circuit 200 and an anode 300 are manufactured on a clean substrate 100. Adjacent anodes 300 are isolated from each other. Each anode 300 corresponds to a pixel or a sub-pixel. Second, a whole layer of pixel definition material is deposited, and then an etching process is used to remove part of the pixel definition material to sequentially prepare a first pixel definition layer 410, a second pixel definition layer 420, and a third pixel definition layer 430. There is a first pixel definition layer 410 between the anodes 300 of two adjacent pixels, two second pixel definition layers 42 are provided above one anode 300, and a third pixel definition layer 430 is provided between two adjacent pixel anodes 300. Third, a vacuum evaporation process is used to prepare an electroluminescent layer 500. The electroluminescent layer 500 includes a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, and a charge generation layer. The multilayer structure formed by the entire organic film layer is collectively referred to as the electroluminescent layer 500. The electroluminescent layer 500 covers the entire surface. Fourth, a metal conductive electrode is formed by evaporating a metal material such as Mg, Ag, Al, Li, K, Ca, or an alloy of the above metal materials MgxAg(1-x), LixAl(1-x), LixCa(1-x), or LixAg(1-x). The thickness of the metal conductive electrode is 5 to 20 nm. Where x is greater than 0 and less than 1. A transparent electrode is then prepared by a process such as sputtering, preferably IZO, ITO, IGZO, AZO, etc. The transparent electrode has a transmittance of >85% @ 532 nm and a thickness of 50 to 1000 nm. The metal conductive electrode and the transparent electrode together form the cathode 600 of the electroluminescent layer, with a total thickness of 55 to 1020 nm. Fifth, a light extraction layer 700 is formed through processes such as evaporation, sputtering, and printing to improve the device's light extraction efficiency. Light extraction layer 700 should be made of an organic or inorganic material with a refractive index (n) greater than 1.9. Sixth, the electroluminescent layer 500 is encapsulated to prevent corrosion and damage to the device from water and oxygen.

[0046] In one embodiment, referring to Figures 4(a) to 4(e), preferably, in a cross section of the display panel along the thickness direction, the third pixel definition layer 430 includes a plurality of (including two) third pixel definition patterns 431, and the plurality of third pixel definition patterns 431 are arranged on the same first pixel definition layer 410.

[0047] Because multiple third pixel defining patterns 431 are provided along the thickness of the display panel, a leakage path must bypass these multiple third pixel defining patterns 431, further increasing the length of the leakage path. Furthermore, since a longer leakage path reduces the likelihood of leakage, providing multiple third pixel defining patterns 431 can more effectively prevent leakage.

[0048] Furthermore, in a cross section of the display panel along the thickness direction, a plurality of the third pixel definition patterns 431 are arranged in parallel, and the third pixel definition patterns 431 are perpendicular or substantially perpendicular to the first pixel definition layer 410 .

[0049] It can be understood that when multiple third pixel definition patterns 431 are arranged in parallel and perpendicular or approximately perpendicular to the first pixel definition layer 410, the space between the multiple third pixel definition patterns 431 can be a straight groove. On the one hand, the straight groove is more convenient for the arrangement of the electroluminescent layer 500, and on the other hand, it is also more convenient for the etching of the third pixel definition layer 430.

[0050] Furthermore, in a cross-section of the display panel along the thickness direction, the plurality of third pixel definition patterns 431 are arranged at equal distances from each other, and the distance from the third pixel definition pattern 431 closest to the second pixel definition layer 420 to the second pixel definition layer 420 is equal to the distance between the plurality of third pixel definition patterns 431. It is understood that etching is required during the process of providing the third pixel definition layer 430. When the distances between the third pixel definition patterns 431 are equal, and the distance from the third pixel definition pattern 431 closest to the second pixel definition layer 420 to the second pixel definition layer 420 is equal to the distance between the plurality of third pixel definition patterns 431, etching is facilitated. Furthermore, this arrangement is less likely to cause etching damage, thereby increasing product yield.

[0051] In this embodiment, the thickness of the third pixel definition layer 430 (i.e., its vertical height in the figure) is greater than or equal to the thickness of the second pixel definition layer 420. Based on the above description, it can be seen that when the thickness of the third pixel definition layer 430 is greater, the detour path required by the leakage path is longer. Therefore, setting the third pixel definition layer 430 as high as possible can achieve better leakage prevention effect.

[0052] Furthermore, in this embodiment, in a cross-section of the display panel along the thickness direction, the first pixel definition layer 410 is configured as a rectangle, and the second pixel definition layer 420 and / or the third pixel definition layer 430 are configured as rectangular, trapezoidal, or arc-shaped protrusions. The first pixel definition layer 410 is configured as a rectangle and can be arranged between the anodes 300, and the second pixel definition layer 420 and / or the third pixel definition layer 430 are configured as rectangular, trapezoidal, or arc-shaped protrusions. These shapes can provide distance in the thickness direction, thereby lengthening the leakage path. Therefore, any shape in which the third pixel definition layer 430 can provide distance in the thickness direction should be within the scope of protection of this application.

[0053] The materials of the first pixel definition layer 410, the second pixel definition layer 420, and the third pixel definition layer 430 are one or more of silicon nitride, silicon oxide, silicon oxynitride, silicon carbide, and photosensitive polyimide. Silicon nitride, silicon oxide, silicon oxynitride, silicon carbide, and photosensitive polyimide are well suited for the pixel definition layer 400 to achieve excellent light shielding and electrical resistance. It should be noted that the materials of the first pixel definition layer 410, the second pixel definition layer 420, and the third pixel definition layer 430 can be the same, or three materials can be used, corresponding to the first pixel definition layer 410, the second pixel definition layer 420, and the third pixel definition layer 430, respectively. Whether a single material or multiple materials are used, it falls within the scope of protection of this application. When the materials of the first pixel definition layer 410, the second pixel definition layer 420, and the third pixel definition layer 430 are the same, the materials do not need to be replaced during the production of the pixel definition layer 400, thereby improving manufacturing efficiency.

[0054] Preferably, one or two third pixel definition layers 430 are used in this application. Because the first pixel definition layer 410 is very short, the third pixel definition layer 430 requires high precision and increases cost. Considering cost, precision, and leakage, extensive experiments have shown that simply placing one or two third pixel definition layers 430 on the first pixel definition layer 410 effectively prevents leakage.

[0055] In this embodiment, referring to Figures 4(a) to 4(e), the display panel manufacturing process of this embodiment is as follows: First, a driving circuit 200 and an anode 300 are manufactured on a clean substrate 100. Adjacent anodes 300 are isolated from each other. Each anode 300 corresponds to a pixel or a sub-pixel. Second, a whole layer of pixel definition material is deposited, and then an etching process is used to remove part of the pixel definition material to sequentially prepare a first pixel definition layer 410, a second pixel definition layer 420, and a third pixel definition layer 430. There is a first pixel definition layer 410 between the anodes 300 of two adjacent pixels, and there are two second pixel definition layers 42 above one anode 300. In addition, in a cross section of the display panel along the thickness direction, a plurality of third pixel definition patterns 431 are provided between two adjacent pixel anodes 300. Third, a vacuum evaporation process is used to prepare an electroluminescent layer 500. The electroluminescent layer 500 includes a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, and a charge generation layer. The multilayer structure formed by the entire organic film layer is collectively referred to as the electroluminescent layer 500. The electroluminescent layer 500 covers the entire surface. Fourth, a metal conductive electrode is formed by evaporating a metal material such as Mg, Ag, Al, Li, K, Ca, or an alloy of the above metal materials MgxAg(1-x), LixAl(1-x), LixCa(1-x), or LixAg(1-x). The thickness of the metal conductive electrode is 5 to 20 nm. Where x is greater than 0 and less than 1. A transparent electrode is then prepared by a process such as sputtering, preferably IZO, ITO, IGZO, AZO, etc. The transparent electrode has a transmittance of >85% @ 532 nm and a thickness of 50 to 1000 nm. The metal conductive electrode and the transparent electrode together form the cathode 600 of the electroluminescent layer, with a total thickness of 55 to 1020 nm. Fifth, a light extraction layer 700 is formed through processes such as evaporation, sputtering, and printing to improve the device's light extraction efficiency. Light extraction layer 700 should be made of an organic or inorganic material with a refractive index (n) greater than 1.9. Sixth, the electroluminescent layer 500 is encapsulated to prevent corrosion and damage to the device from water and oxygen.

[0056] In one embodiment, referring to FIG. 3( a ) to FIG. 3 ( e ), the display panel further includes a fourth pixel definition layer 440 , and the fourth pixel definition layer 440 is disposed on the second pixel definition layer 420 .

[0057] The leakage path needs to pass over the second pixel definition layer 420 to reach another pixel, which can cause leakage. Therefore, the present application provides a fourth pixel definition layer 440, and the fourth pixel definition layer 440 is disposed on the second pixel definition layer 420. This can make the leakage path need to bypass the fourth pixel definition layer 440 above the second pixel definition layer 420 to reach another pixel, thereby causing leakage. This increases the length of the leakage path. The longer the leakage path, the less likely leakage will occur. Therefore, the provision of the fourth pixel definition layer 440 can effectively prevent leakage.

[0058] Referring to Figures 3(a) to 3(e), the display panel manufacturing process of this embodiment is as follows: First, a driving circuit 200 and an anode 300 are fabricated on a clean substrate 100. Adjacent anodes 300 are isolated from each other. Each anode 300 corresponds to a pixel or a sub-pixel. Second, a whole layer of pixel definition material is deposited, and then an etching process is used to remove part of the pixel definition material to sequentially prepare a first pixel definition layer 410, a second pixel definition layer 420, a third pixel definition layer 430, and a fourth pixel definition layer 440. Furthermore, there is a first pixel definition layer 410 between the anodes 300 of two adjacent pixels, two second pixel definition layers 42 are located above one anode 300, and a third pixel definition layer 430 is located between two adjacent pixel anodes 300. The fourth pixel definition layer 440 is disposed on the second pixel definition layer 420. Third, a vacuum evaporation process is used to form an electroluminescent layer 500. The electroluminescent layer 500 includes a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, and a charge generation layer. The multilayer structure formed by the entire organic film layer is collectively referred to as the electroluminescent layer 500. The electroluminescent layer 500 covers the entire surface. Fourth, a metal conductive electrode is formed by evaporating a metal material such as Mg, Ag, Al, Li, K, Ca, or an alloy of the above metal materials MgxAg(1-x), LixAl(1-x), LixCa(1-x), or LixAg(1-x). The thickness of the metal conductive electrode is 5 to 20 nm. Where x is greater than 0 and less than 1. A transparent electrode is then formed by a process such as sputtering, preferably IZO, ITO, IGZO, AZO, etc. The transparent electrode has a transmittance greater than 85% @ 532 nm and a thickness of 50 to 1000 nm. The metal conductive electrode and the transparent electrode together form the cathode 600 of the electroluminescent layer. The total thickness of cathode 600 is 55 to 1020 nm. Fifth, a light extraction layer 700 is formed through processes such as evaporation, sputtering, and printing to improve the light extraction efficiency of the device. Light extraction layer 700 should be made of an organic or inorganic material with a refractive index (n) greater than 1.9. Sixth, the electroluminescent layer 500 is encapsulated to prevent corrosion and damage to the device caused by water and oxygen.

[0059] In one embodiment, referring to Figures 5(a) to 5(e), after setting the fourth pixel definition layer 440, the number of the third pixel definition patterns 431 is set to multiple (including two) on the cross-section of the display panel along the thickness direction, and multiple third pixel definition patterns 431 are set on the first pixel definition layer 410.

[0060] Based on the above analysis, providing multiple third pixel definition patterns 431 in a cross-section of the display panel along the thickness direction can extend the length of the leakage path, and providing the fourth pixel definition layer 440 can also extend the length of the leakage path. Therefore, providing multiple third pixel definition patterns 431 in addition to the fourth pixel definition layer 440 can achieve a longer leakage path, thereby achieving better leakage prevention.

[0061] It should be noted that the material of the fourth pixel definition layer 440 is one of silicon nitride, silicon oxide, silicon oxynitride, silicon carbide, and photosensitive polyimide. The material used for the fourth pixel definition layer 440 can be the same as or different from the material of the first pixel definition layer 410, the second pixel definition layer 420, and the third pixel definition layer 430. When the first pixel definition layer 410, the second pixel definition layer 420, the third pixel definition layer 430, and the fourth pixel definition layer 440 are made of the same material, the material does not need to be changed during the manufacture of the pixel definition layer 400, thereby improving manufacturing efficiency. Furthermore, the fourth pixel definition layer 440 can be configured in one of the following shapes: rectangular, trapezoidal, or circular arc-shaped.

[0062] In this embodiment, referring to Figures 5(a) to 5(e), the display panel manufacturing process of this embodiment is as follows: First, a driving circuit 200 and an anode 300 are fabricated on a clean substrate 100. Adjacent anodes 300 are isolated from each other. Each anode 300 corresponds to a pixel or a sub-pixel. Second, a whole layer of pixel definition material is deposited, and then an etching process is used to remove part of the pixel definition material to sequentially prepare a first pixel definition layer 410, a second pixel definition layer 420, a third pixel definition layer 430, and a fourth pixel definition layer 440. Furthermore, there is a first pixel definition layer 410 between the anodes 300 of two adjacent pixels, and two second pixel definition layers 42 are located above one anode 300. In addition, in a cross-section of the display panel along the thickness direction, a plurality of third pixel definition patterns 431 are provided between two adjacent pixel anodes 300, and the fourth pixel definition layer 440 is provided on the second pixel definition layer 420. Third, a vacuum evaporation process is used to form an electroluminescent layer 500. The electroluminescent layer 500 includes a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, and a charge generation layer. The multilayer structure formed by the entire organic film layer is collectively referred to as the electroluminescent layer 500. The electroluminescent layer 500 covers the entire surface. Fourth, a metal conductive electrode is formed by evaporating a metal material such as Mg, Ag, Al, Li, K, Ca, or an alloy of the above metal materials MgxAg(1-x), LixAl(1-x), LixCa(1-x), or LixAg(1-x). The thickness of the metal conductive electrode is 5 to 20 nm. A transparent electrode is then formed by a sputtering process, preferably IZO, ITO, IGZO, AZO, etc. The transparent electrode has a transmittance of >85% @ 532 nm and a thickness of 50 to 1000 nm. The metal conductive electrode and the transparent electrode together form the cathode 600 of the electroluminescent layer. The total thickness of cathode 600 is 55 to 1020 nm. Fifth, a light extraction layer 700 is formed through processes such as evaporation, sputtering, and printing to improve the light extraction efficiency of the device. Light extraction layer 700 should be made of an organic or inorganic material with a refractive index (n) greater than 1.9. Sixth, the electroluminescent layer 500 is encapsulated to prevent corrosion and damage to the device caused by water and oxygen.

[0063] In this embodiment, the thickness of the first pixel definition layer 410 (i.e., the height in the vertical direction) is less than or equal to the thickness of the anode 300. As shown in Figures 2(a) to 2(e), the first pixel definition layer 410 is connected to the second pixel definition layer 420 and the third pixel definition layer 430, respectively, to form two pixel definition layer grooves. The leakage path needs to pass through the pixel definition layer groove to reach the adjacent pixel and leak. When the thickness of the first pixel definition layer 410 is smaller, the depth of the pixel definition layer groove is deeper, which means that the leakage path needs to pass through a longer distance. Therefore, when the thickness of the first pixel definition layer 410 is less than or equal to the thickness of the anode 300, a better leakage prevention effect can be obtained.

[0064] This application also provides an electronic device including the display panel described in the above embodiments. Therefore, the electronic device includes all embodiments of the display panel described above, and any infringement of the display panel described in the above embodiments falls within the protection scope of this electronic device.

[0065] In this application, the structural embodiments and method embodiments may complement each other if they do not conflict.

[0066] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The terms "plurality" and "several" refer to two or more, unless otherwise clearly defined.

[0067] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that fall within the general scope of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0068] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A display panel, characterized in that: include: anode; A pixel definition layer, wherein the pixel definition layer is disposed between adjacent anodes and partially located on the anodes; Among them, the pixel definition layer includes a first pixel definition layer, a second pixel definition layer and a third pixel definition layer, the first pixel definition layer is arranged between adjacent anodes, at least part of the second pixel definition layer is in contact with the first pixel definition layer, and at least part of the second pixel definition layer is in contact with the anode, and the third pixel definition layer is arranged on the first pixel definition layer.

2. The display panel according to claim 1, wherein: In a cross section of the display panel along a thickness direction, the third pixel definition layer includes a plurality of third pixel definition patterns, and the plurality of third pixel definition patterns are disposed on the first pixel definition layer.

3. The display panel according to claim 2, wherein: In a cross section of the display panel along a thickness direction, a plurality of the third pixel definition patterns are arranged in parallel, and the third pixel definition patterns are perpendicular to the first pixel definition layer.

4. The display panel according to claim 3, wherein: In a cross section of the display panel along the thickness direction, the distances between the plurality of third pixel definition patterns are equal, and the distance from the third pixel definition pattern closest to the second pixel definition layer to the second pixel definition layer is equal to the distance between the plurality of third pixel definition patterns.

5. The display panel according to claim 1, wherein: The thickness of the third pixel definition layer is greater than or equal to the thickness of the second pixel definition layer.

6. The display panel according to claim 1, wherein: In a cross section of the display panel along a thickness direction, the first pixel definition layer is arranged in a rectangular shape, and the second pixel definition layer and / or the third pixel definition layer are rectangular, trapezoidal or arc-shaped protrusions.

7. The display panel according to claim 1, wherein: The materials of the first pixel definition layer, the second pixel definition layer and the third pixel definition layer are one or more of silicon nitride, silicon oxide, silicon oxynitride, silicon carbide and photosensitive polyimide.

8. The display panel according to claim 1, wherein: The materials of the first pixel definition layer, the second pixel definition layer and the third pixel definition layer are the same or different.

9. The display panel according to claim 1, wherein: The display panel further includes a fourth pixel definition layer disposed on the second pixel definition layer.

10. The display panel according to claim 9, wherein: In a cross section of the display panel along a thickness direction, the third pixel definition layer includes a plurality of third pixel definition patterns, and the plurality of third pixel definition patterns are disposed on the first pixel definition layer.

11. The display panel according to claim 9, wherein: The materials of the first pixel definition layer, the second pixel definition layer, the third pixel definition layer and the fourth pixel definition layer are the same or different.

12. The display panel according to claim 1, wherein: The thickness of the first pixel definition layer is less than or equal to the thickness of the anode.

13. The display panel according to claim 1, wherein: The display panel further includes: substrate; A driving circuit, wherein the driving circuit is configured on the substrate, and the anodes are arranged on the driving circuit at intervals; An electroluminescent layer, the electroluminescent layer is disposed on the pixel definition layer and the anode; a cathode, the cathode being disposed on the electroluminescent layer; A light extraction layer, wherein the light extraction layer is disposed on the cathode; The encapsulation layer cooperates with the substrate to encapsulate the driving circuit, the anode, the pixel definition layer, the electroluminescent layer, the cathode and the light extraction layer.

14. An electronic device, characterized in that: A display panel comprising any one of claims 1-13.

Images