Display device, display panel and method of manufacturing the same

Abstract

To provide a display device, a display panel and a method of manufacturing the display panel relating to a field of a display technique.SOLUTION: A display panel includes a drive backplane, a first electrode layer, a light-emitting function layer, and a second electrode. The first electrode layer is provided on a surface of the drive backplane and includes a plurality of first electrodes. The first electrode includes a flat middle part and an edge part surrounding the middle part. The edge part includes a horizontal part surrounding the middle part and a climbing part connecting the middle part and the horizontal part. A thickness of the horizontal part is smaller than that of the middle part. The light-emitting function layer covers the middle part. The second electrode covers the light-emitting function layer and includes a separating part and a plurality of flat parts separated by the separating part. Orthographic projections of the flat parts on the drive backplane are located within the first electrodes so as to correspond to one to one. The separating part includes a protruding area and first recessed areas connecting the protruding area and the flat parts. Orthographic projections of the first recessed areas on the drive backplane are outside the middle parts at least partially.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the field of display technology, and in particular to a display device, a display panel and a manufacturing method for a display panel.

[0002] This application claims priority based on a Chinese patent application dated March 27, 2020, bearing application number 202010230956.6, and entitled "Display device, display panel and manufacturing method thereof," the entire contents of which are incorporated herein by reference. [Background technology]

[0003] At present, OLED (Organic Light-Emitting Diode) display panels are more and more widely used. In an OLED display panel, the light-emitting element usually includes a plurality of OLED light-emitting elements distributed in an array. Each light-emitting element can emit light independently to display an image. However, due to manufacturing process reasons, it is necessary to improve the light-emitting stability of the OLED light-emitting element.

[0004] In addition, the contents described in the above background art section are intended merely to deepen understanding of the background art of the present invention, and may include contents that do not constitute prior art known to those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a display device, a display panel, and a method for manufacturing a display panel.

[0006] According to one aspect of the present invention, there is provided a display panel, the display panel comprising: a drive backplane; a first electrode layer provided on one surface of the driving backplane and including a plurality of first electrodes distributed in an array; a light-emitting functional layer at least partially covering the intermediate portion; a second electrode covering the light-emitting functional layer and including a partition portion and a plurality of smooth portions partitioned by the partition portion; the first electrode includes a flat middle portion and an edge portion surrounding the middle portion, the edge portion includes a flat portion surrounding the middle portion and an inclined portion connected between the middle portion and the flat portion, the thickness of the flat portion is smaller than the thickness of the middle portion, The orthogonal projection of each of the smooth portions on the driving backplane is located within each of the first electrodes in a one-to-one correspondence, the partition portion includes a protruding region and a first recessed region connecting the protruding region and the smooth portion, the first recessed region is recessed toward one side of the smooth portion approaching the driving backplane, and the protruding region protrudes toward one side of the smooth portion away from the driving backplane, and the orthogonal projection of the first recessed region on the driving backplane is located at least partially outside the middle portion of the first electrode.

[0007] In one exemplary embodiment of the invention, in a cross section perpendicular to the driving backplane, an orthogonal projection of a lowest point of the first recessed area on the driving backplane is located outside a middle portion of the first electrode.

[0008] In one exemplary embodiment of the present invention, the first recessed region includes a first side connected to the smooth portion and a second side connected to the protruding region, and the first side and the second side narrow along a direction approaching the driving backplane.

[0009] In an exemplary embodiment of the invention, a slope of the first side surface relative to the middle portion is less than or equal to a slope of the second side surface relative to the middle portion.

[0010] In an exemplary embodiment of the present invention, the second electrode has a minimum thickness in a region corresponding to the first side that is greater than a minimum thickness in a region corresponding to the second side.

[0011] In one exemplary embodiment of the invention, the slope of the first side relative to the middle portion is less than 60°, and the slope of the second side relative to the middle portion is between 60° and 90°.

[0012] In one exemplary embodiment of the invention, the orthogonal projection of the first recessed area on the driving backplane has a width of 0.2 μm or less.

[0013] In one exemplary embodiment of the invention, the depth of the first recessed region is less than twice the maximum thickness of the second electrode.

[0014] In one exemplary embodiment of the invention, the maximum thickness of the second electrode is 90 nm and the depth of the first recessed region is less than 120 nm.

[0015] In one exemplary embodiment of the present invention, the slope of the ramp with respect to the drive backplane is greater than or equal to 30°.

[0016] In one exemplary embodiment of the present invention, in a direction perpendicular to the driving backplane, the minimum distance between the bottom of the first recessed area and the middle of the adjacent first electrode is greater than or equal to 70% of the total thickness of the smooth portion and the light-emitting functional layer.

[0017] In one exemplary embodiment of the invention, the protruding region has a second recessed region recessed towards the driving backplane, the depth of the second recessed region being less than the depth of the first recessed region.

[0018] In an exemplary embodiment of the present invention, the display panel further includes a leakage current interruption layer provided on the same surface of the driving backplane as the first electrode layer, the light-emitting functional layer covers the leakage current interrupting layer, the leakage current interruption layer includes a first confinement layer and a second confinement layer sequentially stacked along a direction away from the driving backplane, the first confinement layer and the second confinement layer each at least partially expose a middle portion of the first electrode, and a boundary of an orthogonal projection of the second confinement layer on the driving backplane is located outside the middle portion; In a cross section perpendicular to the driving backplane, the orthogonal projection of the lowest point of the first recessed area on the driving backplane is located between the orthogonal projection of the middle portion on the driving backplane and the orthogonal projection of the second confining layer, and the second confining layer is located within the orthogonal projection of the protruding area on the leakage current interrupting layer.

[0019] In an exemplary embodiment of the present invention, the display panel further includes a leakage breaker layer including a first confinement layer and a second confinement layer, The first confinement layer is provided on the same surface of the driving backplane as the first electrode layer, and has a plurality of openings, each of the first electrodes is provided in each of the openings in a one-to-one correspondence, and a separation region exposing the driving backplane is formed between an edge portion of each of the first electrodes and a sidewall of the opening in which the edge portion is located; the second confinement layer covers the first confinement layer and the driving backplane located in the separation region, at least partially exposes a middle portion of the first electrode, and is recessed toward the driving backplane in a region of the second confinement layer corresponding to the separation region and the edge portion, the thickness of the second confinement layer being smaller than the thickness of the first confinement layer; The light-emitting functional layer covers the second confinement layer.

[0020] According to one aspect of the present invention, there is provided a display panel, the display panel comprising: a drive backplane; a first electrode layer provided on one surface of the driving backplane and including a plurality of first electrodes distributed in an array; a leakage current interruption layer including a first confinement layer and a second confinement layer, the first confinement layer and the second confinement layer being provided on the same surface of the driving backplane together with the first electrode layer and being sequentially stacked in a direction away from the driving backplane; a light-emitting functional layer that at least partially covers the leakage current interruption layer and an intermediate portion of the first electrode; A second electrode covering the light-emitting functional layer, the first electrode includes a flat middle portion and an edge portion surrounding the middle portion, the edge portion includes a flat portion surrounding the middle portion and an inclined portion connected between the middle portion and the flat portion, the thickness of the flat portion is smaller than the thickness of the middle portion, The first confinement layer is provided with a first opening exposing an intermediate portion of each of the first electrodes in a one-to-one correspondence, and a second opening surrounding the first opening is provided at a position of the second confinement layer corresponding to the first opening, the orthogonal projection of the second confinement layer on the driving backplane is distributed at a distance from the intermediate portion, the first confinement layer is provided with a plurality of annular holes having a blind hole structure surrounding each of the first openings in a one-to-one correspondence, and the second confinement layer is provided on a surface of the first confinement layer away from the driving backplane and located outside the annular holes.

[0021] In one exemplary embodiment of the present invention, the spacing between the sidewall of the second opening and the edge of the intermediate portion of the first electrode surrounded by the second opening is greater than or equal to 1 / 5 of the maximum spacing between the intermediate portions of two adjacent first electrodes.

[0022] In an exemplary embodiment of the present invention, the distance between a sidewall of the second opening and an edge of the middle portion of the first electrode surrounded by the second opening is equal to or greater than 0.2 μm.

[0023] In one exemplary embodiment of the present invention, in a direction perpendicular to the driving backplane, the distance between the surface of the second limiting layer away from the driving backplane and the surface of the intermediate portion away from the driving backplane is greater than or equal to 25% of the thickness of the light-emitting functional layer and is less than or equal to 80% of the thickness of the light-emitting functional layer.

[0024] In one exemplary embodiment of the present invention, the sidewall of the second opening extends in a direction away from the driving backplane, and the angle between the sidewall of the second opening and the intermediate portion is greater than or equal to 65° and less than or equal to 90°.

[0025] In an exemplary embodiment of the present invention, the second confinement layer is provided with a recess in an area located outside the second opening.

[0026] In an exemplary embodiment of the present invention, the width of the groove is smaller than the distance between the middle portions of two adjacent first electrodes.

[0027] In an exemplary embodiment of the present invention, the width of the groove is greater than 0.2 μm.

[0028] According to one aspect of the present invention, there is provided a display panel, the display panel comprising: a drive backplane; a first electrode layer provided on one surface of the driving backplane and including a plurality of first electrodes distributed in an array; a leakage current interrupting layer including a first limiting layer and a second limiting layer; a light-emitting functional layer at least partially covering the second confinement layer and an intermediate portion of the first electrode; A second electrode covering the light-emitting functional layer, the first electrode includes a flat middle portion and an edge portion surrounding the middle portion, the edge portion includes a flat portion surrounding the middle portion and an inclined portion connected between the middle portion and the flat portion, the thickness of the flat portion is smaller than the thickness of the middle portion, The first confinement layer is provided on the same surface of the driving backplane together with the first electrode layer and has a plurality of openings, each of the first electrodes is provided in each of the openings in a one-to-one correspondence, and a separation area exposing the driving backplane is formed between the edge portion of each of the first electrodes and the side wall of the opening in which it is located, and the second confinement layer covers the first confinement layer and the driving backplane located in the separation area, at least partially exposes an intermediate portion of the first electrode, and is recessed toward the driving backplane in the area of ​​the second confinement layer corresponding to the separation area and the edge portion.

[0029] In one exemplary embodiment of the present invention, the thickness of the second confinement layer is less than the thickness of the first confinement layer.

[0030] In one exemplary embodiment of the present invention, the driving backplane is provided with an annular groove surrounding the first electrode in the separation region, and a portion of the second confinement layer located in the separation region is recessed into the annular groove.

[0031] In one exemplary embodiment of the present invention, the driving backplane comprises: A substrate; a driving transistor disposed on one side of the substrate; a planarization layer disposed on a side of the driving transistor away from the substrate; The first electrode layer and the leakage current interruption layer are disposed on a surface of the planar layer away from the substrate, and the materials of the planar layer, the first confinement layer and the second confinement layer are the same.

[0032] In one exemplary embodiment of the invention, the orthogonal projections of the annular groove and the isolation region on the drive backplane overlap.

[0033] In one exemplary embodiment of the present invention, the area of ​​the second electrode corresponding to the sidewall of the opening has a slope with respect to the intermediate portion that is greater than or equal to 65° and less than or equal to 90°, and the area of ​​the second electrode corresponding to the edge portion has a slope with respect to the intermediate portion that is less than 60°.

[0034] In one exemplary embodiment of the present invention, the thickness of the second confinement layer is less than 1 / 5 of the thickness of the first confinement layer.

[0035] According to one aspect of the present invention, there is provided a method for manufacturing a display panel, the method comprising the steps of: forming a first electrode layer including a plurality of first electrodes distributed in an array on one surface of a driving backplane, the first electrodes including a flat middle portion and an edge portion surrounding the middle portion, the edge portion including a flat portion surrounding the middle portion and an inclined portion connected between the middle portion and the flat portion, the thickness of the flat portion being a step smaller than the thickness of the middle portion; forming a leakage current interruption layer on one side of the driving backplane on which the first electrode layer is provided, the leakage current interruption layer including a first confinement layer and a second confinement layer sequentially stacked along a direction away from the driving backplane, the first confinement layer is provided with a first opening exposing each of the first electrodes in a one-to-one correspondence, the second confinement layer is provided with a second opening surrounding the first opening at a position corresponding to the first opening, the orthogonal projection of the second confinement layer on the driving backplane and the intermediate portion are distributed separately, the first confinement layer is provided with a plurality of annular holes having a blind hole structure surrounding each of the first openings in a one-to-one correspondence, the second confinement layer is provided on a surface of the first confinement layer away from the driving backplane and is located outside the annular holes; forming a light-emitting functional layer at least partially covering the leakage current interrupting layer and the intermediate portion; and forming a second electrode covering the light-emitting functional layer.

[0036] In one exemplary embodiment of the present invention, the first confinement layer and the second confinement layer are formed in one and the same patterning process.

[0037] According to one aspect of the present invention, there is provided a method for manufacturing a display panel, the method comprising the steps of: forming a first electrode layer including a plurality of first electrodes distributed in an array on one surface of a driving backplane, the first electrodes including a flat middle portion and an edge portion surrounding the middle portion, the edge portion including a flat portion surrounding the middle portion and an inclined portion connected between the middle portion and the flat portion, the thickness of the flat portion being a step smaller than the thickness of the middle portion; forming a first confinement layer having a plurality of openings on one side of the driving backplane on which the first electrode layer is provided, the first electrodes being provided in the respective openings in a one-to-one correspondence, and a separation region exposing the driving backplane being formed between each of the edge portions and a sidewall of the opening on which each of the edge portions is located; forming a second confinement layer covering the first confinement layer and the driving backplane located in the separation region, the second confinement layer at least partially exposing the middle portion and recessing toward the driving backplane in the separation region and the region corresponding to the edge portion; forming a light-emitting functional layer at least partially covering the second confinement layer and the intermediate portion; and forming a second electrode covering the light-emitting functional layer.

[0038] According to one aspect of the present invention, there is provided a display device including the display panel according to any one of the above aspects.

[0039] It should be noted that the above general description and the following detailed description are merely exemplary and explanatory and are not intended to limit the present invention. [Brief description of the drawings]

[0040] The following drawings are incorporated in the specification and constitute a part of this specification, illustrate embodiments of the present invention, and together with the specification, explain the principles of the present invention. Note that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can obtain other drawings from these drawings without giving creative labor.

[0041] [Figure 1] FIG. 2 is a schematic diagram of a first display panel according to one embodiment of the present invention. [Diagram 2] 4 is an electron microscope photograph of a first display panel according to one embodiment of the present invention. [Diagram 3] FIG. 4 is a schematic diagram of a first display panel according to another embodiment of the present invention. [Figure 4] FIG. 2 is a schematic diagram of a second display panel according to the first embodiment of the present invention. [Diagram 5] 4 is a top view of a first electrode layer of a second display panel according to one embodiment of the present invention. FIG. [Figure 6] 4 is a top view of a leakage breaker layer of a second display panel according to an embodiment of the present invention. FIG. [Figure 7] 4 is a top view of a leakage breaker layer and a first electrode of a second display panel according to an embodiment of the present invention. FIG. [Figure 8] FIG. 11 is a schematic diagram of a second display panel according to a second embodiment of the present invention. [Figure 9] FIG. 4 is a schematic diagram of a third display panel according to one embodiment of the present invention. [Figure 10] 11 is an electron microscope photograph of a third display panel according to one embodiment of the present invention. [Figure 11] 5A to 5C are schematic diagrams illustrating a method for manufacturing a display panel according to one embodiment of the present invention. [Figure 12] 5A to 5C are schematic diagrams illustrating a method for manufacturing a display panel according to one embodiment of the present invention.

[0042] Description of drawing symbols In FIG. 1 to FIG. 3, 1, driving backplane; 101, substrate; 102, active area; 1021, source electrode; 1022, drain electrode; 103, gate insulating layer; 104, gate electrode; 105, first insulating layer; 106, first wiring layer; 107, second insulating layer; 108, second wiring layer; 109, flat layer; 2, first electrode layer; 21, first electrode; 210, middle portion; 211, edge portion; 2110, flat portion; 2111, inclined portion; 220, first Conductive layer; 221, second conductive layer; 222, third conductive layer; 3, light-emitting functional layer; 4, second electrode; 41, partition portion; 4111, second recessed region; 42, smooth portion; 411, protruding region; 412, first recessed region; 4121, first side; 4122, second side; 5, leakage current interruption layer; 51, first limiting layer; 511, opening; 52, second limiting layer; 6, first sealing layer; 7, color filter layer; 8, second sealing layer; 9, transparent cover plate. In Figures 4 to 8, 100, driving backplane; 101, substrate; 102, active area; 1021, source electrode; 1022, drain electrode; 103, gate insulating layer; 104, gate electrode; 105, first insulating layer; 106, first wiring layer; 107, second insulating layer; 108, second wiring layer; 109, flat layer; 200, first electrode layer; 201, first electrode; 210, middle portion; 211, edge portion; 2110, flat portion; 2111, sloped portion; 220, first conductive layer; 221, second conductive layer layer;222, third conductive layer;300, leakage current interruption layer;301, first limiting layer;3011, first opening;3012, annular hole;302, second limiting layer;3021, second opening;3022, groove;400, light-emitting functional layer;401, light-emitting unit layer;402, charge generating layer;500, second electrode;501, recessed region;502, protruding region;503, smooth region;600, first sealing layer;700, color filter layer;800, second sealing layer;900, transparent cover plate. In FIG. 9 and FIG. 10, 100, driving backplane; 101, substrate; 102, active area; 1021, source electrode; 1022, drain electrode; 103, gate insulating layer; 104, gate electrode; 105, first insulating layer; 106, first wiring layer; 107, second insulating layer; 108, second wiring layer; 109, flat layer; 110, annular groove; 200, first electrode layer; 201, first electrode; 210, middle portion; 211, edge portion; 2110, flat Support portion; 2111, inclined portion; 220, first conductive layer; 221, second conductive layer; 222, third conductive layer; 300, leakage current interruption layer; 301, first limiting layer; 3011, opening; 302, second limiting layer; 400, light-emitting functional layer; 500, second electrode; 501, recessed region; 502, protruding region; 503, smooth region; 600, first sealing layer; 700, color filter layer; 800, second sealing layer; 900, transparent cover plate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0043] Hereinafter, exemplary embodiments will be described more completely with reference to the accompanying drawings. However, the exemplary embodiments may be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided so that the present invention is comprehensive and complete, and fully conveys the concept of the exemplary embodiments to those skilled in the art. Since the same reference numerals in the drawings indicate the same or similar structures, detailed description thereof will be omitted. In addition, the drawings are merely schematic diagrams of the present invention and are not necessarily drawn to scale.

[0044] In this specification, relative terms such as "above" and "below" are used to describe the relative relationship between one feature and another feature shown in the drawings, but these terms are merely for convenience and are based on, for example, the exemplary orientation shown in the drawings. If the device shown in the drawings is inverted so that it is upside down, it can be understood that the feature located "above" would become the feature located "below". When a structure is located "above" another structure, it can mean that the structure is integrally formed on the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure by another structure.

[0045] The terms "a", "an", "this" and "said" are used to indicate the presence of one or more elements / components / etc., and the terms "comprise" and "having" are meant to be inclusive in an open format and to include further elements / components / etc. other than the listed elements / components / etc. The terms "first", "second" are used as symbols only and do not limit the number of their objects.

[0046] In the related art, an OLED display panel includes a driving backplane, a plurality of first electrodes, a pixel definition layer, a light-emitting functional layer, a second electrode, and a color filter layer, where the first electrodes are distributed in an array on the driving backplane. The pixel definition layer is provided on the surface of the driving backplane on which the first electrodes are provided, and exposes each of the first electrodes. The light-emitting functional layer covers the pixel definition layer and the surface of the first electrodes away from the driving backplane. The second electrode covers the surface of the light-emitting functional layer away from the driving backplane, so that a plurality of light-emitting elements can be defined by the pixel definition layer. When driven by a driving signal, holes injected by the first electrode and electrons injected by the second electrode enter the light-emitting functional layer to form excitons, and the emission transition of the excitons emits photons to form electroluminescence. The color filter layer is provided on one side of the second electrode away from the driving backplane, and has a plurality of filter regions corresponding to each light-emitting element, and each filter region and its corresponding light-emitting element can be used as a sub-pixel.

[0047] Since the thickness of the pixel-defining layer is greater than that of the first electrode, when the light-emitting functional layer is formed by the deposition process, the light-emitting functional layer is recessed at the junction between the first electrode and the pixel-defining layer, i.e., at the edge of the light-emitting element, and a recessed area is formed in the second electrode accordingly, and the distance between the recessed area of ​​the second electrode and the first electrode becomes short, which is likely to cause tip discharge or even short circuit, affecting the stability of the light-emitting element, and thus making it difficult for the display panel to emit light stably. At the same time, the recessed area of ​​the second electrode corresponds to the first electrode and emits light in the same manner, but the shape of the recessed area is not a flat structure but a structure recessed toward the driving backplane, so that the light emitted within the recessed area is scattered, and at least a part of the light is biased toward the adjacent sub-pixels, causing the emission of the adjacent sub-pixels to interfere with each other and affecting the display effect.

[0048] In the light-emitting functional layer, the second electrode is recessed at the junction of the first electrode and the pixel definition layer, so that a recessed area is formed in the area corresponding to the recess. This recessed area directly faces the first electrode, i.e., the orthogonal projection of the recessed area on the driving backplane is located in the first electrode, so that a tip discharge may occur between them, and even a short circuit may occur. At the same time, the recessed area emits light, and because the shape of the recessed area is curved, the light emitted from it forms a scattering state, thus causing interference with the light emission of the adjacent subpixels.

[0049] In addition, since the light-emitting functional layer is a continuous film layer as a whole, the sub-pixels are connected to each other, and at least a part of the film layer (including but not limited to the hole injection layer) of the light-emitting functional layer causes crosstalk between adjacent sub-pixels. In particular, in the case of a series-type OLED display panel, the light-emitting functional layer includes a plurality of light-emitting unit layers. Two adjacent light-emitting unit layers are connected in series through a charge generation layer. However, since the charge generation layer has excellent charge conduction properties, it causes crosstalk between adjacent sub-pixels and affects the light-emitting effect.

[0050] In order to solve at least one technical problem in the above related art, an embodiment of the present invention provides three kinds of display panels.

[0051] First display panel As shown in FIGS. 1 to 3, the first display panel may include a driving backplane 1, a first electrode layer 2, a light-emitting functional layer 3, and a second electrode 4.

[0052] Here, the first electrode layer 2 is provided on one side of the driving backplane 1 and includes a plurality of first electrodes 21 distributed in an array. The first electrode 21 includes a flat middle portion 210 and an edge portion 211 surrounding the middle portion 210. The edge portion 211 includes a flat portion 2110 surrounding the middle portion 210 and an inclined portion 2111 connected between the middle portion 210 and the flat portion 2110, and the thickness of the flat portion 2110 is smaller than that of the middle portion 210.

[0053] The light-emitting functional layer 3 at least partially covers the first electrode 21 .

[0054] The second electrode 4 covers the light-emitting functional layer 3 and includes a partition portion 41 and a plurality of smooth portions 42 partitioned by the partitioned portions 41. The orthogonal projections of the smooth portions 42 on the driving backplane 1 are located in the first electrodes 21 in a one-to-one correspondence. The partition portion 41 includes a protruding region 411 and a first recessed region 412 connecting the protruding region 411 and the smooth portion 42. The first recessed region 412 is recessed toward one side of the smooth portion 42 approaching the driving backplane 1, and the protruding region 411 protrudes toward one side of the smooth portion 42 away from the driving backplane 1. The orthogonal projections of the first recessed region 412 on the driving backplane 1 are at least partially located outside the middle portion 210 of the first electrode 21.

[0055] In the display panel according to the embodiment of the present invention, each first electrode 21, the corresponding light-emitting functional layer 3, and the second electrode 4 can constitute a light-emitting element capable of emitting light. The orthogonal projection of the first recessed area 412 of the second electrode 4 on the driving backplane 1 is advantageous for ensuring stable light emission of the light-emitting element, since at least a part of the first recessed area 412 is located outside the first electrode 21 and does not directly face the first electrode 21, thereby reducing the risk of tip discharge between the first recessed area 412 and the first electrode 21. At the same time, the mutual interference of the light emission of the adjacent light-emitting elements can be reduced by reducing the light emission within the range of the first recessed area 412.

[0056] As shown in Fig. 2, Fig. 2 is a partial electron microscope photograph of a first display panel according to an embodiment of the present invention. It can be seen that the orthogonal projection of the first recessed region 412 on the driving backplane 1 is at least partially located outside the range of the first electrode 21, so that the risk of tip discharge between the first electrode 21 and the first recessed region 412 can be reduced. At the same time, the emission of the first recessed region 412 can be reduced or even avoided, and interference with adjacent sub-pixels can be prevented.

[0057] Each part of the display panel according to the present invention will now be described in detail.

[0058] As shown in FIG. 1, the driving backplane 1 may include a plurality of driving transistors for driving each light-emitting element to emit light to display an image. Taking one driving transistor of a top-gate structure as an example, the driving backplane 1 includes a substrate 101, a gate insulating layer 103, a gate electrode 104, a first insulating layer 105, and a first wiring layer 106. Here, the material of the substrate 101 may be single crystal silicon or polycrystalline silicon, etc., but is not particularly limited here. The substrate 101 may include an active region 102, and a source electrode 1021 and a drain electrode 1022 located at both ends of the active region 102. The gate insulating layer 103 covers the active region 102, and the gate electrode 104 is provided on a surface of the gate insulating layer 103 away from the substrate 101. The first insulating layer 105 covers the gate electrode 104 and the substrate 101, and the material may include at least one of silicon oxide and silicon nitride. The first wiring layer 106 is provided on the surface of the first insulating layer 105 away from the substrate 101, and the gate electrode 104, the source electrode 1021 and the drain electrode 1022 are all connected to the first wiring layer 106 through via holes filled with tungsten or other metal.

[0059] In addition, the driving backplane 1 may further include a second insulating layer 107 and a second wiring layer 108. The second insulating layer 107 covers the first wiring layer 106 and the first insulating layer 105. The second wiring layer 108 is provided on a surface of the second insulating layer 107 away from the substrate 101. The specific pattern of the second wiring layer 108 may be connected to the first wiring layer 106 through a via hole filled with tungsten or other metal, but is not particularly limited here. At the same time, the second wiring layer 108 may be covered by a flat layer 109. The first electrode layer 2 may be provided on a surface of the flat layer 109 away from the substrate 101, and the first electrode 21 may be connected to the second wiring layer 108 through a via hole filled with tungsten or other metal.

[0060] 1, the first electrode layer 2 is provided on one surface of the driving backplane 1 and includes a plurality of first electrodes 21, which are distributed in an array. For example, the first electrodes 21 of the first electrode layer 2 are distributed in an array on the surface of the flat layer 109 away from the substrate 101, and adjacent first electrodes 21 are provided at a distance from each other.

[0061] In a direction parallel to the driving backplane 1, the first electrode 21 may include a middle portion 210 and an edge portion 211 surrounding the middle portion 210. Here, the middle portion 210 is a flat structure, i.e., the middle portion 210 is approximately parallel to the driving backplane 1. For example, the middle portion 210 is provided on a surface of the flat layer 109 away from the substrate 101, and is parallel to the surface of the flat layer 109 away from the substrate 101.

[0062] The edge portion 211 may include a flat portion 2110 and an inclined portion 2111. Here, the flat portion 2110 is located on the driving backplane 1 and is provided so as to surround the middle portion 210, and the flat portion 2110 is approximately parallel to the driving backplane 1. For example, the flat portion 2110 is located on a surface of the flat layer 109 away from the substrate 101 and is parallel to a surface of the flat layer 109 away from the substrate 101. Also, the thickness of the flat portion 2110 is smaller than the thickness of the middle portion 210.

[0063] The inclined portion 2111 is connected between the middle portion 210 and the flat portion 2110. That is, the inclined portion 2111 is provided so as to surround the middle portion 210, and the flat portion 2110 is provided so as to surround the inclined portion 2111. The inclination of the inclined portion 2111 with respect to the driving backplane 1 is 30° or more, and the inclination is the angle between the surface of the inclined portion 2111 and the driving backplane 1.

[0064] In some embodiments of the present invention, in a direction perpendicular to the driving backplane 1, the first electrode 21 may be a multi-layer structure. For example, the first electrode 21 may include a first conductive layer 220, a second conductive layer 221, and a third conductive layer 222.

[0065] Here, the first conductive layer 220 is provided on the surface of the flat layer 109 away from the substrate 101. The second conductive layer 221 is provided on the surface of the first conductive layer 220 away from the driving backplane 1. The third conductive layer 222 is provided on the surface of the second conductive layer 221 away from the driving backplane 1, and extends to the driving backplane 1 at a predetermined gradient, and then extends a predetermined distance along the driving backplane 1 to cover the first conductive layer 220 and the second conductive layer 221, so that the first conductive layer 220 and the second conductive layer 221 can be protected. Exemplarily, the material of the first conductive layer 220 can include titanium (Ti), the material of the second conductive layer 221 can include silver (Ag), and the material of the third conductive layer 222 can include indium tin oxide (ITO), but of course each conductive layer can also use other materials.

[0066] The intermediate portion 210 of the first electrode 21 includes a region for positioning the third conductive layer 222 on the surface of the second conductive layer 221 away from the driving backplane 1, and the first conductive layer 220 and the second conductive layer 221 located within the range of the orthogonal projection of the region on the driving backplane 1. The flat portion 2110 includes a region where the third conductive layer 222 extends along the driving backplane 1. The inclined portion 2111 includes a region where the third conductive layer 222 extends toward the driving backplane 1 and has a predetermined gradient, and the first conductive layer 220 and the second conductive layer 221 within the range of the orthogonal projection of the region on the driving backplane 1.

[0067] 1, the light-emitting functional layer 3 may be a continuous film layer and simultaneously covers at least a portion of the area of ​​each first electrode 21. In some embodiments of the present invention, the light-emitting functional layer 3 includes one light-emitting unit layer, which includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer and an electron injection layer, which are stacked in order from the first electrode 21 along a direction away from the driving backplane 1.

[0068] In another embodiment of the present invention, the light-emitting functional layer 3 includes a plurality of light-emitting unit layers. The arrangement of the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer and the electron injection layer in each light-emitting unit layer is the same. At the same time, a charge generation layer is provided between two adjacent light-emitting unit layers, so that each light-emitting unit layer can be connected in series by the charge generation layer to form a series-type OLED light-emitting element.

[0069] 1, the second electrode 4 covers the light-emitting functional layer 3, and a drive signal can be applied to the first electrode 21 and the second electrode 4, so that a portion of the light-emitting functional layer 3 located between the first electrode 21 and the second electrode 4 can be made to emit light. The second electrode 4 includes a partition portion 41 and a plurality of smooth portions 42.

[0070] Here, the smooth portions 42 are distributed in an array and are provided to correspond one-to-one with the intermediate portions 210 of the first electrodes 21. That is, the orthogonal projection of each smooth portion 42 on the driving backplane 1 is located within the intermediate portions 210 of the first electrodes 21 in one-to-one correspondence. The smooth portions 42 are parallel or approximately parallel to the intermediate portions 210.

[0071] The partition 41 corresponds to the area of ​​the driving backplane 1 that is not covered by the intermediate portion 210, and is used to separate the smooth portion 42. The partition 41 includes a protruding region 411 and a first recessed region 412.

[0072] Here, the protruding region 411 protrudes toward one side of the smooth portion 42 away from the driving backplane 1, and the first recessed region 412 recesses toward one side of the smooth portion 42 approaching the driving backplane 1. The first recessed region 412 is connected between the protruding region 411 and the smooth portion 42. That is, the first recessed region 412 has an annular structure and is plural in number. Each first recessed region 412 surrounds each smooth portion 42 in one-to-one correspondence and is connected to the protruding region 411. That is, the first recessed region 412 is a transition region between the protruding region 411 and the smooth portion 42.

[0073] The orthogonal projection of the first recessed region 412 on the driving backplane 1 is located at least partially outside the intermediate portion 210 of the first electrode 21, so that it does not face the thick intermediate portion 210 but faces an area other than the first electrode 21 or the thin edge portion 211, thereby reducing the risk of tip discharge and short circuit between the first recessed region 412 of the second electrode 4 and the first electrode 21 and improving the luminous stability of the light-emitting element.

[0074] In some embodiments of the present invention, in a cross section perpendicular to the driving backplane 1, the orthogonal projection of the lowest point of the first recessed region 412 on the driving backplane 1 is located outside the intermediate portion 210. For example, the lowest point corresponds to any one of the inclined portion 2111 and the flat portion 2110 to avoid tip discharge with the intermediate portion 210. The lowest point of the first recessed region 412 in a cross section perpendicular to the driving backplane 1 is a point on the first recessed region 412 that is closest to the first electrode 21 in the cross section perpendicular to the driving backplane 1, i.e., a point that is farthest from the smooth portion 42.

[0075] In addition, in the embodiment of the present invention, the number of the first recessed regions 412 in the cross section perpendicular to the driving backplane 1 may be multiple, and the lowest points in different cross sections may be different. For example, the lowest point may be the point closest to the first electrode 21 in the depth direction, or may be another point in the depth direction, and is specifically determined by the position of the cross section perpendicular to the driving backplane 1.

[0076] 1, in some embodiments of the present invention, the first recessed region 412 has two sides, including a first side 4121 and a second side 4122. Here, the first side 4121 is connected to the smooth portion 42, and the second side 4122 is connected to the protruding region 411. The first side 4121 and the second side 4122 can be narrowed along a direction approaching the driving backplane 1. The first side 4121 and the second side 4122 may be curved or flat, but are not particularly limited here.

[0077] 1, in some embodiments of the present invention, the width S of the orthogonal projection of the first recessed region 412 on the driving backplane 1 is 0.2 μm or less, i.e., the maximum width of the first recessed region 412 is 0.2 μm or less, e.g., 0.1 μm, 0.2 μm, etc. This can prevent the orthogonal projection of the first recessed region 412 on the driving backplane 1 from overlapping with the first electrode 21 or from overlapping too large due to the width of the first recessed region 412 being too large, and can further prevent the occurrence of tip discharge.

[0078] 1, in some embodiments of the present invention, the depth of the first recessed region 412 is less than twice the maximum thickness of the second electrode 4. For example, the maximum thickness of the second electrode 4 is 90 nm, and the depth of the first recessed region 412 is less than 180 nm, such as 120 nm, 100 nm, 80 nm, 70 nm, 60 nm, 50 nm, 40 nm, etc. The depth of the first recessed region 412 refers to the maximum depth of the first recessed region 412, that is, the distance between the point on the first recessed region 412 closest to the driving backplane 1 and the surface of the smooth portion 42 away from the driving backplane 1 in the direction perpendicular to the driving backplane 1.

[0079] Furthermore, in some embodiments of the present invention, the orthogonal projection of each first recessed region 412 on the driving backplane 1 surrounds the outside of the middle portion 210 of the first electrode 21, and the minimum value of the distance between the bottom of the first recessed region 412 and the middle portion 210 of the adjacent first electrode 21 (the distance between the point on the first recessed region 412 closest to the middle portion 210 and the middle portion 210 in the direction perpendicular to the driving backplane 1) is 70% or more of the total thickness of the smooth portion 42 and the light-emitting functional layer 3. The total thickness of the smooth portion 42 and the light-emitting functional layer 3 is the sum of the thicknesses of the smooth portion 42 and the light-emitting functional layer 3. For example, the sum of the thicknesses of the smooth portion 42 and the light-emitting functional layer 3 is about 365 nm, and thus the maximum value of the minimum value of the distance between the bottom of the first recessed region 412 and the middle portion 210 of the adjacent first electrode 21 in the direction perpendicular to the driving backplane 1 is about 255 nm.

[0080] Furthermore, the maximum value of the distance between the bottom of the first recessed region 412 and the intermediate portion 210 of the adjacent first electrode 21 (the distance between the point on the first recessed region 412 closest to the intermediate portion 210 and the intermediate portion 210 in a direction perpendicular to the driving backplane 1) is 400 nm or more, and the maximum value is 450 nm or less.

[0081] Further, as shown in FIG. 1, the gradient of the first side surface 4121 of the first electrode 21 with respect to the intermediate portion 210 is smaller than the gradient of the second side surface 4122 with respect to the intermediate portion 210. That is, the first side surface 4121 is gentler than the second side surface 4122. For example, the gradient of the first side surface 4121 with respect to the intermediate portion 210 may be less than 60°, for example, 50°, 45°, 40°, 30°, etc. The gradient of the second side surface 4122 with respect to the intermediate portion 210 is 60° or more and 90° or less, for example, 60°, 75°, 90°, etc. Here, the gradient of the first side surface 4121 with respect to the intermediate portion 210 is the angle α between the extension plane of the first side surface 4121 and the extension plane of the surface of the intermediate portion 210 away from the driving backplane 1. The inclination of the second side 4122 relative to the intermediate portion 210 is the angle β between the extension of the second side 4122 and the extension of the surface of the intermediate portion 210 facing away from the drive backplane 1 .

[0082] Further, in some embodiments of the present invention, the slope of the first side 4121 relative to the middle portion 210 is less than the slope of the second side 4122 relative to the middle portion 210. Also, the second electrode 4 has a minimum thickness in the region corresponding to the first side 4121 that is greater than the minimum thickness in the region corresponding to the second side 4122.

[0083] Of course, in other embodiments of the present invention, the slope of the first side 4121 relative to the middle portion 210 may be equal to the slope of the second side 4122 relative to the middle portion 210 .

[0084] In some embodiments of the invention, the protruding region 411 has a second recessed region 4111 recessed towards the driving backplane 1 , the depth of the second recessed region 4111 being less than the depth of the first recessed region 412 .

[0085] In some embodiments of the present invention, in order to easily form the second electrode 4, the display panel according to the present invention further includes a leakage current interruption layer 5. The leakage current interruption layer 5 is made of an insulating material, is provided on the same surface of the driving backplane 1 together with the first electrode layer 2, and at least partially exposes each of the first electrodes 21. For example, the leakage current interruption layer 5 is provided with a plurality of openings that at least partially expose the intermediate portion 210. The light-emitting functional layer 3 covers the leakage current interruption layer 5 and extends into the openings to cover at least a part of the intermediate portion 210. The leakage current interruption layer 5 allows the light-emitting functional layer 3 to have pits for forming the first recessed areas 412 of the second electrodes 4.

[0086] As shown in FIGS. 1 and 2, in some embodiments of the present invention, the fault-breaking layer 5 includes a first confining layer 51 and a second confining layer 52 .

[0087] Here, the first confinement layer 51 and the first electrode layer 2 are provided on the same surface of the driving backplane 1 and have a plurality of openings 511. Each first electrode 21 is provided in each opening 511 in a one-to-one correspondence. A separation region X exposing the driving backplane 1 is formed between the edge portion 211 of each first electrode 21 and the sidewall of the opening 511 in which it is located.

[0088] In some embodiments of the present invention, the materials of the planar layer 109, the first confinement layer 301 and the second confinement layer 52 can include silicon oxide and silicon nitride, and the materials of the three can be the same. For example, the planar layer 109, the first confinement layer 51 and the second confinement layer 52 are all silicon oxide. When the first confinement layer 51 is formed by an etching process, it is over-etched at the position of the isolated region X, and the over-etched region extends along the sidewall of the opening 511 into the driving backplane 1, so that at least a part of the region of the driving backplane 1 located in the isolated region X is also etched to form the annular groove 110. That is, the planar layer 109 is etched.

[0089] The second confinement layer 52 covers the first confinement layer 51 and the area of ​​the driving backplane 1 located in the separation region X, and at least partially exposes the middle portion 210 of the first electrode 21. The second confinement layer 52 is recessed toward the driving backplane 1 in the area corresponding to the separation region X and the edge portion 211. The thickness of the second confinement layer 52 is smaller than the thickness of the first confinement layer 51.

[0090] The light-emitting functional layer 3 covers the second confinement layer 52. In addition, due to the constraints of the deposition process, pits are formed in the regions of the light-emitting functional layer 3 corresponding to the isolated region X and the edge portion 211, and the second electrode 4 is recessed by the pits to form the first recessed region 412. As a result, the orthogonal projection of the first recessed region 412 on the driving backplane 1 is at least partially located within the isolated region X or the edge portion 211, and is therefore located outside the intermediate portion 210, thereby preventing discharge from occurring between the driving backplane 1 and the intermediate portion 210. Furthermore, in a cross section perpendicular to the driving backplane 1, the orthogonal projection of the lowest point of the first recessed region 412 on the driving backplane 1 is located within the isolated region X or the edge portion 211.

[0091] As shown in FIG. 3, in another embodiment of the present invention, the leakage interrupting layer 5 includes a first confining layer 51 and a second confining layer 52 .

[0092] Here, the first confinement layer 51 and the first electrode layer 2 are provided on the same surface of the driving backplane 1, and the second confinement layer 52 is provided on the surface of the first confinement layer 51 that is away from the driving backplane 1. The first confinement layer 51 and the second confinement layer 52 both at least partially expose the middle portion 210 of the first electrode 21. The orthogonal projection of the first confinement layer 51 on the driving backplane 1 is connected to the boundary with the edge portion 211 or covers the edges of the edge portion 211 and the middle portion 210. The boundary of the orthogonal projection of the second confinement layer 52 on the driving backplane 1 is located outside the middle portion 210, so that the second confinement layer 52 can be regarded as a ridge formed on the surface of the first confinement layer 51 that is away from the driving backplane 1.

[0093] The light-emitting functional layer 3 covers the second confining layer 52. In addition, due to the constraints of the deposition process, the light-emitting functional layer 3 has pits formed on the sidewalls of the region of the second confining layer 52 exposing the first electrode 21, the pits corresponding to the region of the first confining layer 51 not covered by the second confining layer 52, and the orthogonal projection on the driving backplane 1 is located outside the middle portion 210 of the first electrode 21. At the same time, the light-emitting functional layer 3 has protrusion structures formed at positions corresponding to the second confining layer 52.

[0094] The first confinement layer 51 and the second confinement layer 52 can be formed by one patterning process using the same material, or the first confinement layer 51 and the second confinement layer 52 can be formed separately using different materials.

[0095] When the second electrode 4 covers the light-emitting functional layer 3, the second electrode 4 is recessed downward at the pits of the light-emitting functional layer 3 to form a first recessed area 412, and a protruding area 411 is formed at the position of the protruding structure. The orthogonal projection of the first recessed area 412 on the driving backplane 1 is located between the orthogonal projection of the middle portion 210 on the driving backplane 1 and the orthogonal projection of the second confining layer 52, and the second confining layer 52 is located within the orthogonal projection of the protruding area 411 on the leakage current interrupting layer 5.

[0096] In addition, as shown in FIGS. 1 and 3, the first display panel according to the present invention may further include a first encapsulating layer 6, a color filter layer 7, a second encapsulating layer 8, and a transparent cover plate 9.

[0097] Here, the first sealing layer 6 can cover the second electrode 4. For example, the first sealing layer 6 can include two inorganic layers and an organic layer located between the two inorganic layers.

[0098] The color filter layer 7 is provided on one side of the first sealing layer 6 away from the second electrodes 4, and includes filter regions in one-to-one correspondence with each of the first electrodes 21. The colors of the filter regions include, for example, red, blue, and green.

[0099] The second sealing layer 8 can cover the color filter layer 7 and may have the same structure as the first sealing layer 6 .

[0100] A transparent cover plate 9 can cover the second encapsulation layer 8 and can be made of glass or other materials.

[0101] Second display panel As shown in FIG. 4, the second display panel includes a driving backplane 100 , a first electrode layer 200 , a leakage breaker layer 300 , a light emitting functional layer 400 and a second electrode 500 .

[0102] The first electrode layer 200 is provided on one surface of the driving backplane 100 and includes a plurality of first electrodes 201 distributed in an array. The first electrode 201 includes a flat middle portion 210 and an edge portion 211 surrounding the middle portion 210. The edge portion 211 includes a flat portion 2110 surrounding the middle portion 210 and an inclined portion 2111 connected between the middle portion 210 and the flat portion 2110. The thickness of the flat portion 2110 is smaller than that of the middle portion 210.

[0103] The leakage current interruption layer 300 includes a first confinement layer 301 and a second confinement layer 302 that are provided on the same surface of the driving backplane 100 together with the first electrode layer 200 and are sequentially stacked along a direction away from the driving backplane 100. The first confinement layer 301 is provided with a first opening 3011 that exposes the middle portion 210 of each first electrode 201 in a one-to-one correspondence. A second opening 3021 that surrounds the first opening 3011 is provided at a position of the second confinement layer 302 that corresponds to the first opening 3011. The orthogonal projection of the second confinement layer 302 on the driving backplane 100 is provided at a distance from the middle portion 210. The first confinement layer 301 is provided with a plurality of annular holes 3012 having a blind hole structure that surrounds each first opening 3011 in a one-to-one correspondence. The second confinement layer 302 is provided on a surface of the first confinement layer 301 away from the driving backplane 100 and is located outside the annular hole 3012 .

[0104] The light-emitting functional layer 400 at least partially covers the leakage break layer 300 and the middle portion 210 of the first electrode 201 .

[0105] The second electrode 500 covers the light-emitting functional layer 400 .

[0106] In the display panel according to the embodiment of the present invention, each of the first electrodes 201, the corresponding light-emitting functional layer 400, and the second electrode 500 can constitute a light-emitting element capable of emitting light.

[0107] The second opening 3021 surrounds the outside of the first opening 3011, i.e., the second opening 3021 is larger than the first opening 3011, and the two can form a step hole, so that the first confinement layer 301 is located within the second opening 3021 and has an area exposed by the second opening 3021. At the same time, the orthogonal projection of the second confinement layer 302 on the driving backplane 100 is provided apart from the middle part 210 of the first electrode 201 and is located outside the annular hole 3012. When the light-emitting functional layer 400 has a pit formed in the area contacting the sidewall of the second opening 3021 due to process problems, at least a part of the pit can correspond to the annular hole 3012 of the first confinement layer 301 exposed by the second opening 3021, but cannot correspond to the middle part 210 of the first electrode 201.

[0108] Accordingly, in a cross section perpendicular to the driving backplane 1, the lowest point of the recessed region 501 formed by recessing the second electrode 500 at the pit does not correspond to the middle portion 210. That is, in a cross section perpendicular to the driving backplane 1, the orthogonal projection of the lowest point of the recessed region 501 of the second electrode 500 on the driving backplane 100 is located outside the middle portion 210, i.e., outside the light-emitting element, so that not only tip discharge but even short circuit between the recessed region 501 and the middle portion 210 of the first electrode 201 can be prevented, which is advantageous for ensuring stable light emission of the light-emitting element. At the same time, since light emission within the range of the recessed region 501 can be avoided, mutual interference of light emission between adjacent light-emitting elements can be reduced.

[0109] Hereinafter, each part of the second display panel according to the embodiment of the present invention will be described in detail.

[0110] As shown in FIG. 4, the driving backplane 100 may include a plurality of driving transistors for driving each light-emitting element to emit light to display an image. Taking one driving transistor of a top gate structure as an example, the driving backplane 100 includes a substrate 101, a gate insulating layer 103, a gate electrode 104, a first insulating layer 105, and a first wiring layer 106. Here, the material of the substrate 101 may be single crystal silicon or polycrystalline silicon, etc., but is not particularly limited here. The substrate 101 may include an active region 102, and a source electrode 1021 and a drain electrode 1022 located at both ends of the active region 102. The gate insulating layer 103 covers the active region 102. The gate electrode 104 is provided on a surface of the gate insulating layer 103 away from the substrate 101. The first insulating layer 105 covers the gate electrode 104 and the substrate 101, and the material may include at least one of silicon oxide and silicon nitride. The first wiring layer 106 is provided on the surface of the first insulating layer 105 away from the substrate 101, and the gate electrode 104, the source electrode 1021 and the drain electrode 1022 are all connected to the first wiring layer 106 through via holes filled with tungsten or other metal.

[0111] In addition, the driving backplane 100 may further include a second insulating layer 107 and a second wiring layer 108. The second insulating layer 107 covers the first wiring layer 106 and the first insulating layer 105. The second wiring layer 108 is provided on a surface of the second insulating layer 107 away from the substrate 101. The specific pattern of the second wiring layer 108 is not particularly limited here, but may be connected to the first wiring layer 106 through a via hole filled with tungsten or other metal. At the same time, the second wiring layer 108 may be covered by a planar layer 109. The first electrode layer 200 may be provided on a surface of the planar layer 109 away from the substrate 101, and the first electrode 201 may be connected to the second wiring layer 108 through a via hole filled with tungsten or other metal.

[0112] 4, the first electrode layer 200 is provided on one surface of the driving backplane 100 and includes a plurality of first electrodes 201 distributed in an array. For example, the first electrodes 201 of the first electrode layer 200 are distributed in an array on the surface of the flat layer 109 away from the substrate 101, and adjacent first electrodes 201 are provided at a distance from each other.

[0113] In a direction parallel to the driving backplane 100, the first electrode 201 may include a middle portion 210 and an edge portion 211 surrounding the middle portion 210. Here, the middle portion 210 is a flat structure, that is, the middle portion 210 is approximately parallel to the driving backplane 100. For example, the middle portion 210 is provided on a surface of the flat layer 109 away from the substrate 101, and is parallel to the surface of the flat layer 109 away from the substrate 101.

[0114] The edge portion 211 may include a flat portion 2110 and an inclined portion 2111. Here, the flat portion 2110 is located on the driving backplane 100, is provided to surround the middle portion 210, and is approximately parallel to the driving backplane 100. For example, the flat portion 2110 is located on a surface of the flat layer 109 away from the substrate 101, and is parallel to a surface of the flat layer 109 away from the substrate 101. At the same time, the thickness of the flat portion 2110 is smaller than the thickness of the middle portion 210.

[0115] The inclined portion 2111 is connected between the middle portion 210 and the flat portion 2110. That is, the inclined portion 2111 is disposed so as to surround the middle portion 210, and the flat portion 2110 is disposed so as to surround the inclined portion 2111. The inclination of the inclined portion 2111 with respect to the driving backplane 100 is 30° or more, and the inclination is the angle between the surface of the inclined portion 2111 and the driving backplane 100.

[0116] In some embodiments of the invention, the first electrode 201 includes a flat middle portion 210 and an edge portion 211 surrounding the middle portion 210. In a cross section perpendicular to the driving backplane 1, the orthogonal projection of the lowest point of the recessed area 501 on the driving backplane 100 is located outside the middle portion 210 of the first electrode 201.

[0117] The first electrode 201 includes a first conductive layer 220, a second conductive layer 221, and a third conductive layer 222. The first conductive layer 220 is provided on a surface of the flat layer 109 away from the substrate 101. The second conductive layer 221 is provided on a surface of the first conductive layer 220 away from the driving backplane 100. The third conductive layer 222 is provided on a surface of the second conductive layer 221 away from the driving backplane 100, and extends to the driving backplane 100 at a predetermined gradient. Thus, the third conductive layer 222 covers the first conductive layer 220 and the second conductive layer 221, and protects the first conductive layer 220 and the second conductive layer 221.

[0118] The middle portion 210 of the first electrode 201 includes a region for positioning the third conductive layer 222 on the surface of the second conductive layer 221 away from the driving backplane 100, the first conductive layer 220 and the second conductive layer 221. The edge portion 211 includes a region of the third conductive layer 222 covering the edges of the first conductive layer 220 and the second conductive layer 221, i.e., a region extending toward the driving backplane 100. Exemplarily, the material of the first conductive layer 220 includes titanium (Ti), the material of the second conductive layer 221 includes silver (Ag), and the material of the third conductive layer 222 includes indium tin oxide (ITO), but of course other materials can be used.

[0119] 4, the leakage current interrupting layer 300 is made of an insulating material and is disposed on the same surface of the driving backplane 100 as the first electrode layer 200, for example, on the surface of the flat layer 109 away from the substrate 101. The leakage current interrupting layer 300 includes a first confinement layer 301 and a second confinement layer 302.

[0120] Here, the first confinement layer 301 is provided on the same surface of the driving backplane 100 together with the first electrode layer 200. The first confinement layer 301 is provided with a first opening 3011 that exposes each intermediate portion 210 in one-to-one correspondence, and exposes at least a part of the area of ​​the intermediate portion 210, and the first confinement layer 301 covers the edge portion 211. In some embodiments of the present invention, the first confinement layer 301 can cover the edge of the first opening 3011 and overlap the edge of the intermediate portion 210, and the thickness of the first confinement layer 301 can be greater than or less than the thickness of the first electrode 201. In other embodiments of the present invention, the first opening 3011 can be smaller than the intermediate portion 210, and the thickness of the first confinement layer 301 can be greater than the thickness of the intermediate portion 210. As a result, the first confining layer 301 covers the edge of the intermediate portion 210 and the edge portion 211 of the first electrode 201, thereby preventing tip discharge due to burrs on the edge of the first electrode 201.

[0121] As shown in Fig. 6 and Fig. 7, the first confinement layer 301 may be provided with a plurality of annular holes 3012 surrounding each first opening 3011 in one-to-one correspondence. The annular holes 3012 are blind hole structures, i.e., recessed toward the driving backplane 100 but not exposed from the driving backplane 100. The second confinement layer 302 is provided in an area not surrounded by the annular holes 3012 on the surface of the first confinement layer 301 away from the driving backplane 100, i.e., located outside the annular holes 3012, thereby avoiding shielding the annular holes 3012. The provision of the annular holes 3012 contributes to further shielding the charge generation layer 402 of the light-emitting functional layer 400, and avoids crosstalk between adjacent light-emitting elements.

[0122] The second confinement layer 302 is provided on a surface of the first confinement layer 301 away from the driving backplane 100, and the orthogonal projections of the second confinement layer 302 and the middle portion 210 of the first electrode 201 on the driving backplane 100 are distributed at a distance, so that the orthogonal projection of the second confinement layer 302 on the driving backplane 100 is located outside the middle portion 210. At the same time, a second opening 3021 surrounding the first opening 3011 is provided at a position of the second confinement layer 302 corresponding to the first opening 3011, so that any one of the first openings 3011 and the second opening 3021 surrounding the first opening 3011 can form a step hole. The second opening 3021 exposes the area of ​​the first confinement layer 301 located within the second opening 3021.

[0123] The first confinement layer 301 and the second confinement layer 302 can use the same material and can be formed in one patterning process, or the first confinement layer 301 and the second confinement layer 302 can be formed separately and use different materials.

[0124] As shown in Fig. 4, the light-emitting functional layer 400 may be a continuous film layer, and at least partially covers the middle portion 210 of each first electrode 201 at the same time. In one embodiment of the present invention, as shown in Fig. 4, the light-emitting functional layer 400 includes a plurality of light-emitting unit layers 401, and the arrangement manner of the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer and the electron injection layer of each light-emitting unit layer 401 is the same. At the same time, a charge generation layer 402 is provided between two adjacent light-emitting unit layers 401. Thus, the light-emitting unit layers 401 can be connected in series by the charge generation layer 402 to form a series-type OLED light-emitting element.

[0125] In another embodiment of the present invention, the light-emitting functional layer 400 includes one light-emitting unit layer. The light-emitting unit layer includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer, which are sequentially stacked in a direction away from the first electrode 201 and the driving backplane 100.

[0126] When using a deposition process to form the light-emitting functional layer 400, the partial edge of the light-emitting functional layer 400 located in the second opening 3021 is recessed toward the driving backplane 100 along the sidewall of the second opening 3021 to form a pit. The pit can correspond to the exposed annular hole 3012 in the second opening 3021. At the same time, a protrusion structure is formed in the area of ​​the light-emitting functional layer 400 corresponding to the second confinement layer 302.

[0127] As shown in FIG. 4, the second electrode 500 covers the light-emitting functional layer 400, and a driving signal can be applied to the first electrode 201 and the second electrode 500, so that the portion of the light-emitting functional layer 400 located between the first electrode 201 and the second electrode 500 can be made to emit light.

[0128] The shape of the second electrode 500 corresponds to the light-emitting functional layer 400, and the light-emitting functional layer 400 is recessed at the pits to form a recessed region 501, and the second confinement layer 302 has a protruding region 502 in a region corresponding to the protruding structure, and the recessed region 501 corresponds to the annular hole 3012. As a result, at least a part of the orthogonal projection of the recessed region 501 on the driving backplane 100 is located outside the middle portion 210 of the first electrode 201, so that the tip discharge between the first electrode 201 and the recessed region 501 of the second electrode 500 can be reduced or avoided. In addition, the region of the second electrode 500 corresponding to the middle portion 210 is a smooth region 503. The connection relationship between the recessed region 501, the protruding region 502, and the smooth region 503 may refer to the protruding region 411, the first recessed region 412, and the smooth portion 42 according to the embodiment of the first display panel described above, but a detailed description thereof will be omitted here.

[0129] 4 and 5, in some embodiments of the present invention, in a cross section perpendicular to the driving backplane 1, in order to ensure that the orthogonal projection of the lowest point of the recessed region 501 of the second electrode 500 on the driving backplane 100 is completely outside the middle portion 210, the distance L between the sidewall of the second opening 3021 and the edge of the middle portion 210 surrounded by the second opening 3021 in the direction parallel to the middle portion 210 is equal to or greater than 1 / 5 of the maximum distance H between the middle portions 210 of two adjacent first electrodes 201. For example, by setting the maximum distance H between two adjacent middle portions 210 to 1 μm and the distance L to 0.2 μm, 0.1 μm, etc., the orthogonal projection of the recessed region 501 on the first confinement layer 301 is located between the sidewall of the second opening 3021 and the middle portion 210, i.e., the orthogonal projection of the recessed region 501 on the driving backplane 100 is completely outside the middle portion 210, which can further avoid the occurrence of tip discharge.

[0130] In another embodiment of the present invention, as shown in FIG. 4, by making the sidewalls of the second opening 3021 perpendicular to the driving backplane 100, the partial cross section of the second limiting layer 302 located between the two intermediate portions 210 can be rectangular.

[0131] In another embodiment of the present invention, as shown in Fig. 8, the sidewall of the second opening 3021 expands in a direction away from the driving backplane 100, so that the partial cross section of the second confinement layer 302 located between the two intermediate portions 210 forms a trapezoid. At the same time, the angle between the sidewall of the second opening 3021 and the intermediate portion 210, i.e., the angle γ between the extension plane of the sidewall of the second opening 3021 and the extension plane of the surface of the intermediate portion 210 away from the driving backplane 100, is greater than or equal to 60° and less than or equal to 90°, for example, it may be 60°, 65°, 70°, 80° or 90°.

[0132] In order to avoid the formation of crosstalk between two adjacent light-emitting elements, the series-type OLED display panel can shield the charge generation layer 402 of the light-emitting element by the leakage blocking layer 300. Of course, the crosstalk can also be prevented by shielding the hole injection layer or other film layers.

[0133] As shown in Fig. 4, in some embodiments of the present invention, the light-emitting functional layer 400 includes a plurality of light-emitting unit layers 401. The arrangement manner of the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer and the electron injection layer of each light-emitting unit layer 401 is the same. At the same time, a charge generation layer 402 is provided between two adjacent light-emitting unit layers 401, so that each light-emitting unit layer 401 is connected in series by the charge generation layer 402, thereby forming a series-type OLED light-emitting element.

[0134] In the direction perpendicular to the driving backplane 100, the distance between the surface of the second confinement layer 302 away from the driving backplane 100 and the surface of the middle portion 210 of the first electrode 201 away from the driving backplane 100, i.e., the height of the second confinement layer 302 relative to the middle portion 210, is 25% or more of the thickness of the light-emitting functional layer 400 and 80% or less of the thickness of the light-emitting functional layer 400. The step formed by the second confinement layer 302 can prevent the formation of crosstalk between adjacent light-emitting elements by blocking a highly conductive film layer such as the charge generation layer 402 or the hole injection layer of the light-emitting functional layer 400. For example, when the thickness of the light-emitting functional layer 400 is 400 nm, the height of the second confinement layer 302 relative to the middle portion 210 is 100 nm or more and 320 nm or less. When the thickness of the light-emitting functional layer 400 is 300 nm, the height of the second confinement layer 302 relative to the middle portion 210 is 25 nm or more and 75 nm or less.

[0135] 4, 6 and 7, the second confinement layer 302 may have a groove 3022 in an area located outside the second opening 3021. The groove 3022 blocks the charge generation layer 402, which contributes to further blocking the charge generation layer 402 and better prevents crosstalk. There is no particular limitation on the shape and structure of the groove 3022, but the depth of the groove 3022 may be set to be smaller than the depth of the recessed region 501. The number of the groove 3022 may be one or more that are distributed concentrically.

[0136] 4, the width of the groove 3022 is smaller than the distance between the intermediate portions 210 of two adjacent first electrodes 201. For example, when the distance between two adjacent intermediate portions 210 is 0.1 μm to 1 μm, the maximum width of the groove 3022 is 1 μm. At the same time, in order to ensure the blocking effect of the groove 3022, the width is made larger than 0.2 μm, so that the groove 3022 has a predetermined span and the charge generating layer 402 can be blocked by the presence of the groove 3022.

[0137] Also, the second display panel according to the present invention may further include a first encapsulation layer 600, a color filter layer 700, a second encapsulation layer 800, and a transparent cover plate 900. Here, the first encapsulation layer 600 may cover the second electrode 500. For example, the first encapsulation layer 600 may include two inorganic layers and an organic layer located between the two inorganic layers.

[0138] The color filter layer 700 is disposed on one side of the first sealing layer 600 away from the second electrode 500, and includes filter regions in one-to-one correspondence with each of the first electrodes 201. The colors of the filter regions include, for example, red, blue, and green.

[0139] The second encapsulation layer 800 can cover the color filter layer 700 and its structure can be the same as that of the first encapsulation layer 600 .

[0140] A transparent cover plate 900 can cover the second sealing layer 800, and its material can be glass or material.

[0141] Third display panel As shown in FIGS. 9 and 10 , the third display panel may include a driving backplane 100 , a first electrode layer 200 , a leakage break layer 300 , a light emitting functional layer 400 and a second electrode 500 .

[0142] The first electrode layer 200 is provided on one surface of the driving backplane 100 and includes a plurality of first electrodes 201 distributed in an array. The first electrode 201 includes a flat middle portion 210 and an inclined edge portion 211 surrounding the middle portion 210. The edge portion 211 includes a flat portion 2110 surrounding the middle portion 210 and an inclined portion 2111 connected between the middle portion 210 and the flat portion 2110. The thickness of the flat portion 2110 is smaller than that of the middle portion 210.

[0143] The leakage current interruption layer 300 includes a first confinement layer 301 and a second confinement layer 302. The first confinement layer 301 is provided on the same surface of the driving backplane 100 as the first electrode layer 200, and has a plurality of openings 3011. Each of the first electrodes 201 is provided in each of the openings 3011 in a one-to-one correspondence. That is, the first electrodes 201 are provided in each of the openings 3011 of the first confinement layer 301. Between the edge portion 211 of each of the first electrodes 201 and the side wall of the opening 3011 in which it is located, a separation region X that exposes the driving backplane 100 is formed. The second confinement layer 302 covers the first confinement layer 301 and the driving backplane 100 located in the separation region X, and exposes the middle portion 210 of the first electrode 201. In addition, the second confinement layer 302 is recessed toward the driving backplane 100 in the region corresponding to the separation region X and the edge portion 211. That is, the second confinement layer 302 is conformally coupled to the first confinement layer 301 and to the surface of the driving backplane 100 .

[0144] The light-emitting functional layer 400 covers at least the second confinement layer 302 and the middle portion 210 of the first electrode 201. The second electrode 500 covers the light-emitting functional layer 400.

[0145] According to the third display panel of the present invention, the second confinement layer 302 is recessed toward the driving backplane 100 in the separation region X, so that the pits formed in the light-emitting functional layer 400 do not correspond to the middle portion 210 due to process problems, and can be located at a position corresponding to the separation region X or the edge portion 211. Accordingly, the second electrode 500 has a recessed region 501 formed by recessing the pits, which does not correspond to the middle portion 210. That is, in a cross section perpendicular to the driving backplane 1, the orthogonal projection of the lowest point of the recessed region 501 of the second electrode 500 on the driving backplane 100 is located outside the middle portion 210, i.e., outside the light-emitting element, which can prevent not only tip discharge but also short circuit between the recessed region 501 of the second electrode 500 and the middle portion 210, and is advantageous for ensuring stable light emission of the light-emitting element. At the same time, since light emission within the recessed region 501 can be avoided, mutual interference of light emission of adjacent light-emitting elements can be reduced.

[0146] The third display panel will be described in detail below.

[0147] As shown in Figures 9 and 10, the specific structures of the driving backplane 100 and the first electrode layer 200 of the third display panel can be referred to in the second display panel described above, so detailed description thereof will be omitted here.

[0148] In some embodiments of the present invention, the driving backplane 100 includes a substrate 101, a driving transistor, and a planar layer 109. Here, the substrate 101 may be a silicon-based substrate. The driving transistor is disposed on one side of the substrate 101. The planar layer 109 is disposed on one side of the driving transistor away from the substrate 101. A first electrode layer 200 and a leakage current interruption layer 300 are disposed on a surface of the planar layer 109 away from the substrate 101.

[0149] Specifically, the driving backplane 100 may be a silicon-based backplane, and may include a substrate 101, a gate insulating layer 103, a gate electrode 104, a first insulating layer 105, a first wiring layer 106, a second insulating layer 107, a second wiring layer 108, and a planar layer 109. The substrate 101 includes an active region 102. The active region 102 has a source electrode 1021 and a drain electrode 1022, and the specific structure thereof may refer to the embodiment of the second display panel. The first confinement layer 301 and the first electrode 201 may be provided on the surface of the planar layer 109 away from the substrate 101. The materials of the planar layer 109, the first confinement layer 301, and the second confinement layer 302 may all include insulating materials such as silicon oxide and silicon nitride.

[0150] In some embodiments of the present invention, the thickness of the first confinement layer 301 is set to be greater than that of the first electrode layer 200, thereby blocking film layers such as a hole injection layer in the light-emitting functional layer 400 that may cause crosstalk between two adjacent subpixels.

[0151] In some embodiments of the present invention, the first electrode 201 includes a first conductive layer 220, a second conductive layer 221, and a third conductive layer 222. The first conductive layer 220 is provided on a surface of the flat layer 109 away from the substrate 101. The second conductive layer 221 is provided on a surface of the first conductive layer 220 away from the driving backplane 100. The third conductive layer 222 is provided on a surface of the second conductive layer 221 away from the driving backplane 100, and extends to the driving backplane 100 with a predetermined gradient to cover the first conductive layer 220 and the second conductive layer 221 and protect the first conductive layer 220 and the second conductive layer 221. Here, the middle portion 210 of the first electrode 201 includes a region of the third conductive layer 222 located on the surface of the second conductive layer 221 away from the driving backplane 100, the first conductive layer 220, and the second conductive layer 221. The edge portion 211 includes a region of the third conductive layer 222 covering the edges of the first conductive layer 220 and the second conductive layer 221, i.e., the region extending to the driving backplane 100. Illustratively, the material of the first conductive layer 220 includes titanium (Ti), the material of the second conductive layer 221 includes silver (Ag), and the material of the third conductive layer 222 includes indium tin oxide (ITO), although of course other materials can be used.

[0152] In some embodiments of the present invention, the thickness of the second confinement layer 302 is smaller than that of the first confinement layer 301, and the thickness of the second confinement layer 302 is smaller than 1 / 5 of the thickness of the first confinement layer 301. This can avoid the inability to fill the isolated region X and the edge portion 211 to form a recessed structure. For example, the thickness of the first confinement layer 301 is about 350 nm, and the thickness of the second confinement layer 302 is 70 nm or less, for example, the thickness of the second confinement layer 302 is 60 nm, 50 nm, etc.

[0153] In some embodiments of the present invention, the driving backplane 100 is provided with an annular groove 110 surrounding the first electrode 201 in each separation region X. The second confinement layer 302 is recessed into the annular groove 110 at the portion located in the separation region X. For example, the annular groove 110 is formed on the planar layer 109, and the depth of the annular groove 110 is less than the thickness of the planar layer 109, although no particular limitation is imposed here on the specific thickness.

[0154] Specifically, the materials of the planar layer 109, the first confinement layer 301 and the second confinement layer 302 can include silicon oxide and silicon nitride, and the materials of the three are the same. For example, the planar layer 109, the first confinement layer 301 and the second confinement layer 302 are all silicon oxide. When the first confinement layer 301 is formed by an etching process, over-etching occurs at the position of the isolated region X, and the over-etched region extends into the driving backplane 100 along the sidewall of the opening 3011, so that at least a part of the region of the driving backplane 100 located in the isolated region X is also etched to form the annular groove 110. That is, the planar layer 109 is etched. In some embodiments of the present invention, the orthogonal projection of the annular groove 110 on the driving backplane 100 overlaps with the isolated region X, that is, the sidewall of the annular groove 110 is the boundary of the isolated region X. Of course, the over-etched area may be smaller than the separation area X, so that the sidewall of the annular groove 110 is spaced a predetermined distance from the edge portion 211 of the first electrode 201. In some embodiments of the invention, the slope α of the area of ​​the second electrode 500 covering the sidewall of the opening 3011 relative to the intermediate portion 210 of the first electrode 201 is 65° to 90°, e.g., 60°, 75°, 90°, etc. The area of ​​the second electrode 500 located between the intermediate portion 210 and the annular groove 110 has a slope β of less than 60° relative to the intermediate portion 210, e.g., 50°, 45°, 40°, 30°, etc.

[0155] 9 and 10, the light-emitting functional layer 400 covers at least a portion of the second confinement layer 302 and the first electrode 201. When the light-emitting functional layer 400 is formed using a deposition process, the portion of the light-emitting functional layer 400 located in the separated region X is recessed toward the driving backplane 100 to form a pit. At the same time, a protrusion structure is formed in the region of the light-emitting functional layer 400 corresponding to the first confinement layer 301. For specific details of the light-emitting functional layer 400, reference may be made to the embodiment of the second display panel, and detailed description thereof will be omitted here.

[0156] As shown in FIG. 9 and FIG. 10, the second electrode 500 covers the light-emitting functional layer 400. The pits of the light-emitting functional layer 400 are recessed to form recessed regions 501. Due to the restriction of the pits, in a cross section perpendicular to the driving backplane 1, the orthogonal projection of the lowest point of the recessed region 501 on the driving backplane 100 is located within the range of the separation region X or the edge portion 211, that is, outside the middle portion 210, that is, outside the light-emitting element. This can prevent not only tip discharge between the recessed region 501 of the second electrode 500 and the first electrode 201, but also short circuit, which is advantageous for ensuring stable light emission of the light-emitting element. At the same time, light emission within the recessed region 501 can be avoided, so that mutual interference of light emission of adjacent light-emitting elements can be reduced. In addition, the region of the second electrode 500 corresponding to the first confinement layer 301 is a protruding region 502, and the region of the second electrode 500 corresponding to the middle portion 210 is a smooth region 503. The connection relationship between the recessed region 501, the protruding region 502, and the smooth region 503 can be referred to in relation to the protruding region 411, the first recessed region 412, and the smooth portion 42 according to the embodiment of the first display panel described above, and therefore a detailed description thereof will be omitted here.

[0157] Also, as shown in Figures 9 and 10, the display panel according to the present invention may include a first encapsulation layer 600, a color filter layer 700, a second encapsulation layer 800 and a transparent cover plate 900. The specific structure may refer to the embodiments of the first display panel and the second display panel described above, and therefore detailed description thereof will be omitted here.

[0158] The embodiment of the present invention further provides a method for manufacturing a display panel. The display panel may be the above-mentioned second display panel. As shown in Fig. 11, the method includes steps S110 to S140.

[0159] Here, in step S110, a first electrode layer including a plurality of first electrodes distributed in an array is formed on one side of the driving backplane, the first electrode including a flat middle portion and an edge portion surrounding the middle portion, the edge portion including a flat portion surrounding the middle portion and a sloping portion connected between the middle portion and the flat portion, and the thickness of the flat portion is smaller than the thickness of the middle portion.

[0160] In step S120, a leakage current interruption layer is formed on one side of the driving backplane on which the first electrode layer is provided, the leakage current interruption layer includes a first confinement layer and a second confinement layer sequentially stacked along a direction away from the driving backplane, the first confinement layer is provided with a first opening exposing each of the first electrodes in a one-to-one correspondence, a second opening surrounding the first opening is provided at a position of the second confinement layer corresponding to the first opening, the orthogonal projection of the second confinement layer on the driving backplane and the intermediate portion are distributed at a distance, the first confinement layer is provided with a plurality of annular holes having a blind hole structure surrounding each of the first openings in a one-to-one correspondence, and the second confinement layer is provided on a surface of the first confinement layer away from the driving backplane and is located outside the annular holes.

[0161] In step S130, a light emitting functional layer is formed to at least partially cover the leakage breaker layer and the middle portion.

[0162] In step S140, a second electrode is formed to cover the light-emitting functional layer.

[0163] In some embodiments of the present invention, step S120 of forming a leakage interruption layer on one side of the driving backplane on which the first electrode layer is provided includes the following steps.

[0164] In step S1210, a first confinement layer is formed on one side of the driving backplane on which the first electrode layer is provided, and the first confinement layer is provided with first openings exposing each first electrode in one-to-one correspondence, and a plurality of annular holes having a blind hole structure surrounding each of the first openings in one-to-one correspondence.

[0165] In step S1220, a second confinement layer is formed on a surface of the first confinement layer away from the driving backplane, and a second opening surrounding the first opening is provided at a position of the second confinement layer corresponding to the first opening, and the orthogonal projection of the second confinement layer on the driving backplane and the intermediate portion are spaced apart, and the second confinement layer is provided on the surface of the first confinement layer away from the driving backplane and is located outside the annular hole.

[0166] Since the detailed description of the structure of each layer and the beneficial effects of the manufacturing method according to the embodiment of the present invention have been described in the above embodiment of the second display panel, detailed description thereof will be omitted here.

[0167] In some embodiments of the present invention, the first confinement layer and the second confinement layer can be formed in one step by a grayscale masking process or other patterning process, or can be formed separately, but this is not particularly limited here.

[0168] The embodiment of the present invention further provides a method for manufacturing a display panel, which may be the third display panel described above. As shown in Fig. 12, the method for manufacturing the display panel includes steps S210 to S250.

[0169] Here, in step S210, a first electrode layer including a plurality of first electrodes distributed in an array is formed on one side of the driving backplane, the first electrode including a flat middle portion and an edge portion surrounding the middle portion, the edge portion including a flat portion surrounding the middle portion and a sloping portion connected between the middle portion and the flat portion, and the thickness of the flat portion is smaller than the thickness of the middle portion.

[0170] In step S220, a first confinement layer having a plurality of openings is formed on one side of the driving backplane on which the first electrode layer is provided, and each of the first electrodes is provided in each of the openings in a one-to-one correspondence, and a separation area exposing the driving backplane is formed between each of the edge portions and the sidewall of the opening in which it is located.

[0171] In step S230, a second confinement layer is formed covering the first confinement layer and the driving backplane located in the separation region, the second confinement layer at least partially exposing the middle portion and recessed toward the driving backplane in the region of the second confinement layer corresponding to the separation region and the edge portion.

[0172] In step S240, a light emitting functional layer is formed to at least partially cover the second confinement layer and the middle portion.

[0173] In step S250, a second electrode is formed to cover the light-emitting functional layer.

[0174] Since the detailed description and beneficial effects of each layer structure of the manufacturing method according to the embodiment of the present invention have been described in the above embodiment of the third display panel, detailed description thereof will be omitted here.

[0175] It should be noted that, although in the figures, various steps of the method of the present invention are described in a particular order, this does not require or imply that the steps must be performed in this particular order, or that all of the steps shown must be performed, to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined and performed in a single step, and / or a step may be broken down into multiple steps for execution.

[0176] An embodiment of the present invention further provides a display device. The display device may include any one of the various embodiments of the first display panel, the second display panel, and the third display panel described above. For specific structures of the first display panel to the third display panel, the above embodiments may be referred to, and detailed description thereof will be omitted here. The display device of the present invention may be used in electronic devices such as mobile phones, tablet PCs, and televisions.

[0177] Those skilled in the art can easily obtain other embodiments of the present invention through the understanding of the specification and the practice of the invention described in the specification. This application includes any modification, use, or adaptation to the present invention, which modification, use, or adaptation is in accordance with the general principles of the present invention and includes known knowledge or ordinary technical means in the art that are not disclosed in the present invention. The specification and examples are merely exemplary, and the true scope and spirit of the present invention is to be determined by the following claims.

Claims

1. A display panel, a drive backplane; a first electrode layer provided on one surface of the driving backplane and including a plurality of first electrodes distributed in an array; a light-emitting functional layer at least partially covering the intermediate portion; a second electrode covering the light-emitting functional layer and including a partition portion and a plurality of smooth portions partitioned by the partition portion; the first electrode includes a flat intermediate portion and an edge portion surrounding the intermediate portion; an orthogonal projection of each of the smooth portions on the driving backplane is located within each of the first electrodes in one-to-one correspondence; the partition portion includes a protruding region and a first recessed region that connects the protruding region and the smooth portion, the first recessed area is recessed toward a side of the smooth portion that is closer to the driving backplane; the protruding region protrudes toward a side of the smooth portion that is away from the driving backplane; The protruding region has a second recessed region recessed toward the drive backplane. Display panel.

2. In a cross section perpendicular to the drive backplane, the lowest point of the second recessed region is located on the side away from the drive backplane of the lowest point of the first recessed region. The display panel according to claim 1 .

3. The width of the first recessed region is smaller than the width of the protruding region. The display panel according to claim 1 .

4. The first recessed area includes: A first side surface connected to the smooth portion; a second side connected to the protruding region; The first side and the second side are tapered along a direction approaching the driving backplane. The display panel according to claim 1 .

5. The slope of the first side surface relative to the intermediate portion is equal to or less than the slope of the second side surface relative to the intermediate portion. The display panel according to claim 4.

6. The second electrode has a minimum thickness in a region corresponding to the first side that is greater than a minimum thickness in a region corresponding to the second side. The display panel according to claim 4.

7. a slope of the first side relative to the middle portion is less than 60°; The inclination of the second side surface with respect to the intermediate portion is equal to or greater than 60° and equal to or less than 90°. The display panel according to claim 5 .

8. The orthogonal projection of the first recessed area on the driving backplane has a width of 0.2 μm or less. The display panel according to claim 1 .

9. The depth of the first recessed region is less than twice the maximum thickness of the second electrode. The display panel according to claim 1 .

10. The depth of the first recessed region is less than 50 nm. The display panel according to claim 1 .

11. The depth of the second recessed region is less than the depth of the first recessed region. The display panel according to claim 1 .

12. a leakage current interruption layer disposed on the same surface of the driving backplane as the first electrode layer; the light-emitting functional layer covers the leakage current interrupting layer, The orthogonal projection of the first recessed area on the driving backplane is located within the orthogonal projection of the fault-tolerant layer on the driving backplane. The display panel according to claim 1 .

13. In a cross section perpendicular to the driving backplane, an orthogonal projection of a lowest point of the first recessed area on the driving backplane is located within an orthogonal projection of the leakage current interrupting layer on the driving backplane. The display panel according to claim 12.

14. In a direction perpendicular to the driving backplane, the minimum distance between the bottom of the first recessed region and the middle portion of the adjacent first electrode is 70% or more of the total thickness of the smooth portion and the light-emitting functional layer. The display panel according to claim 13.

15. the protruding region has a second recessed region recessed toward the drive backplane; The depth of the second recessed region is less than the depth of the first recessed region. The display panel according to claim 1 .

16. a leakage current interruption layer disposed on the same surface of the driving backplane as the first electrode layer; the light-emitting functional layer covers the leakage current interrupting layer, The leakage current interruption layer includes a first confinement layer and a second confinement layer sequentially stacked in a direction away from the driving backplane, the first confinement layer and the second confinement layer both at least partially expose a middle portion of the first electrode; a boundary of an orthogonal projection of the second confinement layer on the driving backplane is located outside the intermediate portion; In a cross section perpendicular to the driving backplane, an orthogonal projection of a lowest point of the first recessed area on the driving backplane is located between an orthogonal projection of the middle portion on the driving backplane and an orthogonal projection of the second confinement layer; The second confinement layer is located within an orthogonal projection of the protruding region on the leakage current interrupting layer. The display panel according to claim 1 .

17. The insulating layer further includes a leakage current interrupting layer including a first confinement layer and a second confinement layer, the first confinement layer is disposed on the same surface of the driving backplane as the first electrode layer and has a plurality of openings; The first electrodes are provided in the openings in one-to-one correspondence, a separation region is formed between an edge portion of each of the first electrodes and a sidewall of the opening in which the edge portion is located, the separation region exposing the driving backplane; the second confinement layer covers the first confinement layer and the driving backplane located in the separated region and at least partially exposes a middle portion of the first electrode; the second confinement layer is recessed toward the driving backplane in areas corresponding to the separation areas and the edge portions; the thickness of the second confinement layer is less than the thickness of the first confinement layer; The light-emitting functional layer covers the second confinement layer. The display panel according to claim 1 .

18. A display device comprising the display panel according to any one of claims 1 to 17.

Images