Display panel and display device

Abstract

The invention relates to a display device, a display panel and a manufacturing method of the display panel, and relates to the technical field of display. The display panel comprises a driving backboard, a first electrode layer, a light-emitting function layer and a second electrode. The first electrode layer is arranged on one surface of the driving back plate and comprises a plurality of first electrodes, and each first electrode comprises a flat middle part and an edge part surrounding the middle part; the edge part comprises a flat part surrounding the middle part and a climbing part connecting the middle part and the flat part, and the thickness of the flat part is smaller than that of the middle part; the light-emitting functional layer covers the middle part; the second electrode covers the light-emitting functional layer and comprises a separation part and a plurality of gentle parts separated by the separation part, and orthographic projections of the gentle parts on the driving back plate are located in the first electrodes in a one-to-one correspondence mode; the partition part comprises a convex area and a first concave area connected with the convex area and the gentle part, and at least part of orthographic projection of the first concave area on the driving back plate is located outside the middle part.

Description

[0001] The present disclosure is a divisional application. The application number of the original application is 202010230956.6, the application date is March 27, 2020, and the name of the invention is “Display device, display panel and manufacturing method thereof”. Technical Field

[0002] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0003] At present, the application of OLED (Organic Light-Emitting Diode) display panels is becoming more and more widespread. In an OLED display panel, the light-emitting device generally includes a plurality of OLED light-emitting devices distributed in an array, each of which can emit light independently to display an image. However, due to the manufacturing process, the light-emitting stability of the OLED light-emitting device still needs to be improved.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The purpose of the present disclosure is to overcome the above-mentioned deficiencies of the prior art and provide a display panel and a display device, which can improve the stability of light emission.

[0006] According to one aspect of the present disclosure, there is provided a display panel, comprising:

[0007] Driver backplane;

[0008] A first electrode layer is provided on one side of the driving backplane and includes a plurality of first electrodes distributed in an array, wherein 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 a climbing portion connected between the middle portion and the flat portion, and the thickness of the flat portion is smaller than that of the middle portion;

[0009] A light-emitting functional layer at least partially covers the middle portion;

[0010] The second electrode covers the light-emitting functional layer and includes a partition and a plurality of flat portions separated by the partition, wherein the orthographic projections of the flat portions on the driving backplane are located one by one within each of the first electrodes; the partition includes a protruding area and a first recessed area connecting the protruding area and the flat portion, wherein the first recessed area is recessed toward a side of the flat portion close to the driving backplane, and the protruding area is raised toward a side of the flat portion away from the driving backplane, and the orthographic projection of the first recessed area on the driving backplane is at least partially located outside the middle portion of the first electrode.

[0011] In an exemplary embodiment of the present disclosure, on a cross section perpendicular to the driving backplane, an orthographic projection of the lowest point of the first recessed area on the driving backplane is located outside a middle portion of the first electrode.

[0012] In an exemplary embodiment of the present disclosure, the first recessed area includes a first side surface connected to the flat portion and a second side surface connected to the protruding area, and the first side surface and the second side surface shrink in a direction approaching the driving back plate.

[0013] In an exemplary embodiment of the present disclosure, 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.

[0014] In an exemplary embodiment of the present disclosure, a minimum thickness of a region of the second electrode corresponding to the first side surface is greater than a minimum thickness of a region corresponding to the second side surface.

[0015] In an exemplary embodiment of the present disclosure, the slope of the first side surface relative to the middle portion is less than 60°; the slope of the second side surface relative to the middle portion is not less than 60° and not greater than 90°.

[0016] In an exemplary embodiment of the present disclosure, a width of an orthographic projection of the first recessed area on the driving backplane is no greater than 0.2 μm.

[0017] In an exemplary embodiment of the present disclosure, the depth of the first recessed area is less than twice the maximum thickness of the second electrode.

[0018] In an exemplary embodiment of the present disclosure, the maximum thickness of the second electrode is 90 nm, and the depth of the first recessed area is less than 120 nm.

[0019] In an exemplary embodiment of the present disclosure, the slope of the climbing portion relative to the driving back plate is not less than 30°.

[0020] In an exemplary embodiment of the present disclosure, a minimum distance between the bottom of the first recessed area and the middle portion of the adjacent first electrode along a direction perpendicular to the driving backplane is not less than 70% of the total thickness of the flat portion and the light-emitting functional layer.

[0021] In an exemplary embodiment of the present disclosure, the protruding area has a second recessed area recessed toward the driving back plate, and a depth of the second recessed area is smaller than a depth of the first recessed area.

[0022] In an exemplary embodiment of the present disclosure, the display panel further includes:

[0023] A leakage cutoff layer, which is arranged on the same surface of the driving backplane as the first electrode layer, and the light-emitting functional layer covers the leakage cutoff layer;

[0024] The leakage cutoff layer comprises a first limiting layer and a second limiting layer stacked in sequence in a direction away from the driving back plate, wherein the first limiting layer and the second limiting layer at least partially expose the middle portion of the first electrode, and the boundary of the orthographic projection of the second limiting layer on the driving back plate is located outside the middle portion;

[0025] On a cross section perpendicular to the driving back plate, the lowest point of the first recessed area is located between the middle portion and the orthographic projection of the second limiting layer on the driving back plate; the second limiting layer is located within the orthographic projection of the leakage cutoff layer in the protruding area.

[0026] In an exemplary embodiment of the present disclosure, the display panel further includes:

[0027] The leakage cutoff layer includes a first limiting layer and a second limiting layer, wherein the first limiting layer and the first electrode layer are arranged on the same surface of the driving back plate and have a plurality of openings, and each of the first electrodes is arranged in each of the openings in a one-to-one correspondence; a spacing area for exposing the driving back plate is formed between the edge of each of the first electrodes and the side wall of the opening where the first electrode is located;

[0028] The second defining layer covers the first defining layer and the driving backplane located in the spacing area and at least partially exposes the middle portion of the first electrode, and the second defining layer is recessed toward the driving backplane in the spacing area and the area corresponding to the edge portion; the thickness of the second defining layer is less than the thickness of the first defining layer;

[0029] The light-emitting functional layer covers the second defining layer.

[0030] According to one aspect of the present disclosure, there is provided a display panel, comprising:

[0031] Driver backplane;

[0032] A first electrode layer is provided on one side of the driving backplane and includes a plurality of first electrodes distributed in an array; 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 a climbing portion connected between the middle portion and the flat portion, and the thickness of the flat portion is smaller than that of the middle portion;

[0033] A leakage cutoff layer, which is arranged on the same surface of the driving back plate as the first electrode layer, and comprises a first limiting layer and a second limiting layer which are sequentially stacked in a direction away from the driving back plate, wherein the first limiting layer is provided with first openings corresponding to each other and exposing the middle parts of the first electrodes, and the second limiting layer is provided with second openings surrounding the first openings at positions corresponding to the first openings, and the second limiting layer is distributed at intervals between the positive projection of the driving back plate and the middle part; the first limiting layer is provided with a plurality of annular holes of blind hole structures corresponding to each other and surrounding the first openings, and the second limiting layer is provided on the surface of the first limiting layer away from the driving back plate and is located outside the annular holes;

[0034] A light-emitting functional layer at least partially covers the middle portion between the leakage cutoff layer and the first electrode;

[0035] The second electrode covers the light-emitting functional layer.

[0036] In an exemplary embodiment of the present disclosure, a distance between a side wall of the second opening and an edge of a middle portion of the first electrode surrounded by the side wall of the second opening is not less than 1 / 5 of a maximum distance between middle portions of two adjacent first electrodes.

[0037] In an exemplary embodiment of the present disclosure, a distance between a sidewall of the second opening and an edge of a middle portion of the first electrode surrounded by the sidewall is not less than 0.2 μm.

[0038] In an exemplary embodiment of the present disclosure, in a direction perpendicular to the driving backplane, a distance between a surface of the second defining layer facing away from the driving backplane and a surface of the middle portion facing away from the driving backplane is not less than 25% of the thickness of the light-emitting functional layer and not more than 80% of the thickness of the light-emitting functional layer.

[0039] In an exemplary embodiment of the present disclosure, the side wall of the second opening expands in a direction away from the driving back plate, and an angle between the side wall of the second opening and the middle portion is not less than 65° and not more than 90°.

[0040] In an exemplary embodiment of the present disclosure, a groove is provided in a region of the second defining layer outside the second opening.

[0041] In an exemplary embodiment of the present disclosure, the width of the groove is smaller than the distance between the middle portions of two adjacent first electrodes.

[0042] In an exemplary embodiment of the present disclosure, the width of the groove is greater than 0.2 μm.

[0043] According to one aspect of the present disclosure, there is provided a display panel, comprising:

[0044] Driver backplane;

[0045] A first electrode layer is provided on one side of the driving backplane and includes a plurality of first electrodes distributed in an array, wherein 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 a climbing portion connected between the middle portion and the flat portion, and the thickness of the flat portion is smaller than that of the middle portion;

[0046] A leakage cutoff layer, comprising a first defining layer and a second defining layer, wherein the first defining layer and the first electrode layer are arranged on the same surface of the driving backplane and have a plurality of openings, wherein the first electrodes are arranged in the openings one by one; a spacer region exposing the driving backplane is formed between the edge of each first electrode and the side wall of the opening where the first electrode is located; the second defining layer covers the first defining layer and the driving backplane located in the spacer region and at least partially exposes the middle portion of the first electrode, and the second defining layer is recessed toward the driving backplane in the spacer region and in the region corresponding to the edge;

[0047] a light-emitting functional layer, at least partially covering the middle portion between the second defining layer and the first electrode;

[0048] The second electrode covers the light-emitting functional layer.

[0049] In an exemplary embodiment of the present disclosure, the thickness of the second defining layer is smaller than the thickness of the first defining layer.

[0050] In an exemplary embodiment of the present disclosure, the driving back plate is provided with an annular groove surrounding the first electrode in the spacing area, and a portion of the second limiting layer located in the spacing area is recessed into the annular groove.

[0051] In an exemplary embodiment of the present disclosure, the driving backplane includes:

[0052] substrate;

[0053] A driving transistor, disposed on one side of the substrate;

[0054] The planar layer is arranged on the side of the driving transistor away from the substrate; the first electrode layer and the leakage cutoff layer are arranged on the surface of the planar layer away from the substrate, and the material of the planar layer, the first limiting layer and the second limiting layer are the same.

[0055] In an exemplary embodiment of the present disclosure, the annular groove coincides with an orthographic projection of the spacing area on the driving back plate.

[0056] In an exemplary embodiment of the present disclosure, the slope of the area of ​​the second electrode corresponding to the side wall of the opening relative to the middle portion is not less than 65° and not more than 90°; the slope of the area of ​​the second electrode corresponding to the edge portion relative to the middle portion is less than 60°.

[0057] In an exemplary embodiment of the present disclosure, the thickness of the second defining layer is less than 1 / 5 of the thickness of the first defining layer.

[0058] According to one aspect of the present disclosure, there is provided a method for manufacturing a display panel, comprising:

[0059] A first electrode layer is formed on one side of the driving backplane, wherein the first electrode layer includes a plurality of first electrodes distributed in an array; 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 a climbing portion connected between the middle portion and the flat portion, and the thickness of the flat portion is smaller than that of the middle portion;

[0060] A leakage cutoff layer is formed on a side of the driving back plate provided with the first electrode layer, the leakage cutoff layer comprises a first limiting layer and a second limiting layer sequentially stacked in a direction away from the driving back plate, the first limiting layer is provided with first openings corresponding to each other to expose each of the first electrodes, the second limiting layer is provided with a second opening surrounding the first opening at a position corresponding to the first opening, the second limiting layer is distributed at intervals between the positive projection of the driving back plate and the middle part; the first limiting layer is provided with a plurality of annular holes of a blind hole structure corresponding to each of the first openings, the second limiting layer is provided on a surface of the first limiting layer away from the driving back plate, and is located outside the annular holes;

[0061] forming a light-emitting functional layer at least partially covering the leakage cutoff layer and the middle portion;

[0062] A second electrode is formed to cover the light emitting functional layer.

[0063] In an exemplary embodiment of the present disclosure, the first defining layer and the second defining layer are formed by a same patterning process.

[0064] According to one aspect of the present disclosure, there is provided a method for manufacturing a display panel, comprising:

[0065] A first electrode layer is formed on one side of the driving backplane, wherein the first electrode layer includes a plurality of first electrodes distributed in an array, wherein 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 a climbing portion connected between the middle portion and the flat portion, and the thickness of the flat portion is smaller than that of the middle portion;

[0066] A first limiting layer is formed on a side of the driving backplane provided with the first electrode layer, the first limiting layer has a plurality of openings, and each of the first electrodes is provided in each of the openings in a one-to-one correspondence; a spacing area for exposing the driving backplane is formed between each of the edge portions and the side wall of the opening where the edge portion is located;

[0067] forming a second defining layer covering the first defining layer and the driving back plate located in the spacing area, wherein the second defining layer at least partially exposes the middle portion and is recessed toward the driving back plate in the spacing area and in an area corresponding to the edge portion;

[0068] forming a light-emitting functional layer that at least partially covers the second defining layer and the middle portion;

[0069] A second electrode is formed to cover the light emitting functional layer.

[0070] According to one aspect of the present disclosure, a display device is provided, comprising any one of the display panels described above.

[0071] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0073] Figure 1 It is a schematic diagram of an embodiment of the first display panel disclosed in the present invention.

[0074] Figure 2 This is an electron microscope image of an embodiment of the first display panel disclosed in the present invention.

[0075] Figure 3 It is a schematic diagram of another embodiment of the first display panel disclosed in the present invention.

[0076] Figure 4 It is a schematic diagram of a first embodiment of the second display panel disclosed in the present invention.

[0077] Figure 5 FIG. 1 is a top view of the first electrode layer in an embodiment of the second display panel disclosed in the present invention.

[0078] Figure 6 FIG. 1 is a top view of a leakage cutoff layer in an embodiment of a second display panel disclosed in the present invention.

[0079] Figure 7 It is a top view of a leakage cutoff layer and a first electrode in an embodiment of a second display panel disclosed in the present invention.

[0080] Figure 8 It is a schematic diagram of a second embodiment of the second display panel disclosed in the present invention.

[0081] Fig. 9 It is a schematic diagram of an implementation of the third display panel disclosed in the present invention.

[0082] Fig.10 This is an electron microscope image of an embodiment of the third display panel disclosed in the present invention.

[0083] Fig.11 It is a schematic diagram of an embodiment of a method for manufacturing a display panel disclosed in the present invention.

[0084] Fig.12 It is a schematic diagram of an embodiment of a method for manufacturing a display panel disclosed in the present invention.

[0085] Description of reference numerals:

[0086] Figure 1-Figure 3 middle:

[0087] 1. driving backplane; 101. substrate; 102. active area; 1021. source; 1022. drain; 103. gate insulating layer; 104. gate; 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 part; 211. edge part; 2110. flat part; 2111. climbing part; 220. first conductive layer ; 221, second conductive layer; 222, third conductive layer; 3, light-emitting functional layer; 4, second electrode; 41, partition; 4111, second recessed area; 42, flat portion; 411, protruding area; 412, first recessed area; 4121, first side surface; 4122, second side surface; 5, leakage cutoff layer; 51, first limiting layer; 511, opening; 52, second limiting layer; 6, first encapsulation layer; 7, color film layer; 8, second encapsulation layer; 9, transparent cover.

[0088] Figure 4-8 middle:

[0089] 100, driving backplane; 101, substrate; 102, active area; 1021, source; 1022, drain; 103, gate insulating layer; 104, gate; 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 part; 211, edge part; 2110, flat part; 2111, climbing part; 220, first conductive layer; 221, second conductive layer; 222, third conductive layer; 300, leakage cutoff 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 generation layer; 500, second electrode; 501, recessed area; 502, protruding area; 503, flat area; 600, first encapsulation layer; 700, color film layer; 800, second encapsulation layer; 900, transparent cover.

[0090] Fig. 9 and Fig.10 middle:

[0091] 100, driving backplane; 101, substrate; 102, active area; 1021, source; 1022, drain; 103, gate insulating layer; 104, gate; 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 part; 211, edge part; 2110, flat part; 2111, climbing part; 220, first conductive layer; 221, second conductive layer; 222, third conductive layer; 300, leakage cutoff layer; 301, first limiting layer; 3011, opening; 302, second limiting layer; 400, light-emitting functional layer; 500, second electrode; 501, recessed area; 502, protruding area; 503, flat area; 600, first encapsulation layer; 700, color film layer; 800, second encapsulation layer; 900, transparent cover. DETAILED DESCRIPTION

[0092] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0093] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0094] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusion and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first" and "second" are used merely as labels and are not intended to limit the quantity of their objects.

[0095] In the related art, the 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, wherein the first electrode array is distributed on the driving backplane; the pixel definition layer is arranged on the surface of the driving backplane provided with the first electrode, and each first electrode is exposed; the light-emitting functional layer covers the surface of the pixel definition layer and the first electrode away from the driving backplane, and the second electrode covers the surface of the light-emitting functional layer away from the driving backplane, so that a plurality of light-emitting devices can be defined by the pixel definition layer. Driven by the driving signal, the holes injected by the first electrode and the electrons injected by the second electrode enter the light-emitting functional layer and form excitons, which emit photons by radiation transition to form electroluminescence. The color filter layer is arranged on the side of the second electrode away from the driving backplane, and has a plurality of filter areas corresponding to each light-emitting device, and each filter area and its corresponding light-emitting device can be used as a sub-pixel.

[0096] Since the thickness of the pixel definition layer is greater than that of the first electrode, when the light-emitting functional layer is formed by the evaporation process, a depression will appear in the light-emitting functional layer at the junction of the first electrode and the pixel definition layer, that is, at the edge of the light-emitting device, so that the second electrode forms a corresponding depression area. The depression area of ​​the second electrode is close to the first electrode, which is prone to tip discharge or even short circuit, affecting the stability of the light-emitting device, making it difficult for the display panel to emit light stably. At the same time, the depression area of ​​the second electrode corresponds to the first electrode, and thus also emits light. However, since the morphology of the depression area is a structure that is concave toward the driving backplane, rather than a planar structure, the light emitted within the range of the depression area is in a scattered state, and at least part of the light is deflected toward the adjacent sub-pixels, so that the light emission of adjacent sub-pixels interferes with each other, affecting the display effect.

[0097] The light-emitting functional layer is recessed at the junction of the second electrode and the first electrode and the pixel definition layer, so that the second electrode forms a recessed area in the area corresponding to the recess, and the recessed area is directly opposite to the first electrode, that is, the positive projection of the recessed area on the driving backplane is located in the first electrode, so that a tip discharge or even a short circuit may occur between the two. At the same time, the recessed area will emit light, and because the shape of the recessed area is curved, the light it emits is in a scattered state, thereby interfering with the light emission of adjacent sub-pixels.

[0098] In addition, since the light-emitting functional layer is a whole continuous film layer, the sub-pixels are interconnected, and at least a portion of the film layer in the light-emitting functional layer (including but not limited to the hole injection layer) will cause crosstalk between adjacent sub-pixels. In particular, for a series-type OLED display panel, the light-emitting functional layer includes a plurality of light-emitting unit layers, and two adjacent light-emitting unit layers are connected in series through a charge generation layer. However, the charge generation layer has good charge conduction characteristics, which will cause crosstalk between adjacent sub-pixels and affect the light-emitting effect.

[0099] In order to solve at least one technical problem in the above-mentioned related art, embodiments of the present disclosure provide three display panels.

[0100] The first display panel

[0101] like Figure 1-Figure 3 As shown, the display panel may include a driving backplane 1, a first electrode layer 2, a light-emitting functional layer 3 and a second electrode 4, wherein:

[0102] The first electrode layer 2 is arranged 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 a climbing portion 2111 connected between the middle portion 210 and the flat portion 2110, and the thickness of the flat portion 2110 is less than that of the middle portion 210.

[0103] The light-emitting functional layer 3 at least partially covers the first electrode 21 .

[0104] The second electrode 4 covers the light-emitting functional layer 3 and includes a partition 41 and a plurality of flat portions 42 separated by the partition 41. The orthographic projections of the flat portions 42 on the driving backplane 1 are located within the first electrodes 21 in a one-to-one correspondence. The partition 41 includes a protruding area 411 and a first recessed area 412 connecting the protruding area 411 and the flat portion 42. The first recessed area 412 is recessed toward the side of the flat portion 42 close to the driving backplane 1, and the protruding area 411 is raised toward the side of the flat portion 42 away from the driving backplane 1. The orthographic projection of the first recessed area 412 on the driving backplane 1 is at least partially located outside the middle portion 210 of the first electrode 21.

[0105] In the display panel of the embodiment of the present disclosure, each first electrode 21 and its corresponding light-emitting functional layer 3 and second electrode 4 can constitute a light-emitting device, which can emit light. By making the orthographic projection of the first recessed area 412 of the second electrode 4 on the driving backplane 1 at least partially located outside the first electrode 21, and not directly facing the first electrode 21, the risk of tip discharge between the first recessed area 412 and the first electrode 21 can be reduced, which is conducive to ensuring stable light emission of the light-emitting device. At the same time, the light emission within the range of the first recessed area 412 can be reduced, thereby reducing the mutual interference of light emission of adjacent light-emitting devices.

[0106] like Figure 2 As shown, Figure 2 This is a partial electron microscope image of an embodiment of the first display panel disclosed in the present invention. It can be seen that the orthographic projection of the first recessed area 412 on the driving backplane 1 is at least partially located outside the range of the first electrode 21, which can reduce the risk of tip discharge between the first electrode 21. At the same time, the light emission of the first recessed area 412 can be reduced or even avoided to prevent interference with adjacent sub-pixels.

[0107] The following is a detailed description of each part of the display panel of the present disclosure:

[0108] like Figure 1As shown, the driving backplane 1 may include a plurality of driving transistors for driving each light-emitting device to emit light to display an image. Taking a driving transistor with a top gate structure as an example, the driving backplane 1 includes a substrate 101, a gate insulating layer 103, a gate 104, a first insulating layer 105 and a first wiring layer 106, wherein: the material of the substrate 101 may be single crystal silicon or polycrystalline silicon, etc., which is not specifically limited here; the substrate 101 may include an active area 102 and a source 1021 and a drain 1022 located at both ends of the active area 102. The gate insulating layer 103 covers the active area 102; the gate 104 is arranged on the surface of the gate insulating layer 103 away from the substrate 101. The first insulating layer 105 covers the gate 104 and the substrate 101, and its material may include at least one of silicon oxide and silicon nitride. The first wiring layer 106 is disposed on a surface of the first insulating layer 105 away from the substrate 101 , and the gate 104 , the source 1021 and the drain 1022 are all connected to the first wiring layer 106 through vias filled with tungsten or other metals.

[0109] In addition, the driving backplane 1 may also 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 arranged on the 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, and it can be connected to the first wiring layer 106 through a via filled with tungsten or other metals. At the same time, the second wiring layer 108 can be covered with a flat layer 109, the first electrode layer 2 can be arranged on the surface of the flat layer 109 away from the substrate 101, and the first electrode 21 can be connected to the second wiring layer 108 through a via filled with tungsten or other metals.

[0110] like Figure 1 As shown, the first electrode layer 2 is disposed on one side of the driving backplane 1 and includes a plurality of first electrodes 21, and the first electrodes 21 are arranged in an array. For example, the first electrodes 21 of the first electrode layer 2 are arranged in an array on the surface of the flat layer 109 away from the substrate 101, and adjacent first electrodes 21 are arranged at intervals.

[0111] 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, wherein the middle portion 210 is a flat structure, that is, the middle portion 210 is substantially parallel to the driving backplane 1. For example, the middle portion 210 is disposed on a surface of the flat layer 109 facing away from the substrate 101, and is parallel to the surface of the flat layer 109 facing away from the substrate 101.

[0112] The edge portion 211 may include a flat portion 2110 and a climbing portion 2111, wherein the flat portion 2110 is located on the driving back plate 1 and is disposed around the middle portion 210, and the flat portion 2110 is substantially parallel to the driving back plate 1. For example, the flat portion 2110 is located on the 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. At the same time, the thickness of the flat portion 2110 is less than the thickness of the middle portion 210.

[0113] The climbing portion 2111 is connected between the middle portion 210 and the flat portion 2110, that is, the climbing portion 2111 surrounds the middle portion 210, and the flat portion 2110 is arranged around the climbing portion 2111. The slope of the climbing portion 2111 relative to the driving back plate 1 is not less than 30°, and the slope is the angle between the surface of the climbing portion 2111 and the driving back plate 1.

[0114] In some embodiments of the present disclosure, 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, wherein:

[0115] The first conductive layer 220 is disposed on the surface of the flat layer 109 away from the substrate 101; the second conductive layer 221 is disposed on the surface of the first conductive layer 220 away from the driving backplane 1; the third conductive layer 222 is disposed on the surface of the second conductive layer 221 away from the driving backplane 1, and extends to the driving backplane 1 with a certain slope, and then extends a certain distance along the driving backplane 1, so as 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. Exemplarily, the material of the first conductive layer 220 may include titanium (Ti), the material of the second conductive layer 221 may include silver (Ag), and the material of the third conductive layer 222 may include indium tin oxide (ITO). Of course, each conductive layer may also be made of other materials.

[0116] The middle portion 210 of the first electrode 21 includes an area where the third conductive layer 222 is located 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 in the area within the orthographic projection range of the driving backplane 1. The flat portion 2110 includes an area where the third conductive layer 222 extends along the driving backplane 1. The climbing portion 2111 includes an area with a certain slope where the third conductive layer 222 extends toward the driving backplane 1, and the first conductive layer 220 and the second conductive layer 221 in the area within the orthographic projection range of the driving backplane 1.

[0117] like Figure 1As shown, the light-emitting functional layer 3 may be a continuous film layer, and simultaneously covers at least a portion of each first electrode 21. In some embodiments of the present disclosure, the light-emitting functional layer 3 includes a light-emitting unit layer, and 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 stacked in sequence from the first electrode 21 to the direction away from the driving backplane 1.

[0118] In another embodiment of the present disclosure, the light-emitting functional layer 3 includes multiple light-emitting unit layers, and the hole injection, hole transport layer, light-emitting layer, electron transport layer and electron injection layer of each light-emitting unit layer are distributed in the same manner. At the same time, a charge generation layer is provided between two adjacent light-emitting unit layers, so that each light-emitting unit layer is connected in series through the charge generation layer to form a series-type OLED light-emitting device.

[0119] like Figure 1 As shown, the second electrode 4 covers the light-emitting functional layer 3, and a driving signal can be applied to the first electrode 21 and the second electrode 4 to make the portion of the light-emitting functional layer 3 between the first electrode 21 and the second electrode 4 emit light. The second electrode 4 includes a partition 41 and a plurality of flat portions 42, wherein:

[0120] The flat portions 42 are arranged in an array and correspond to the middle portions 210 of the first electrodes 21 , that is, the orthographic projections of the flat portions 42 on the driving backplane 1 are located in the middle portions 210 of the first electrodes 21 . The flat portions 42 are parallel or substantially parallel to the middle portions 210 .

[0121] The partition 41 corresponds to the area of ​​the driving back plate 1 not covered by the middle portion 210 and is used to separate the flat portion 42. The partition 41 includes a protruding area 411 and a first recessed area 412, wherein:

[0122] The protruding area 411 protrudes toward the side of the flat portion 42 away from the driving back plate 1, and the first recessed area 412 is recessed toward the side of the flat portion 42 close to the driving back plate 1. The first recessed area 412 is connected between the protruding area 411 and the flat portion 42, that is, the first recessed area 412 is an annular structure, and there are multiple first recessed areas 412, each of which surrounds each flat portion 42 in a one-to-one correspondence and is connected to the protruding area 411, that is, the first recessed area 412 is a transition area between the protruding area 411 and the flat portion 42.

[0123] The orthographic projection of the first recessed area 412 on the driving backplane 1 is at least partially located outside the middle portion 210 of the first electrode 21, so that it is opposite to the area outside the first electrode 21 or the edge portion 211 with a smaller thickness, but not opposite to the middle portion 210 with a larger thickness. This can reduce the risk of tip discharge and short circuit between the first recessed area 412 of the second electrode 4 and the first electrode 21, thereby improving the stability of light emission of the light-emitting device.

[0124] In some embodiments of the present disclosure, on a cross section perpendicular to the driving back plate, the orthographic projection of the lowest point of the first recessed area 412 on the driving back plate 1 is located outside the middle portion 210, for example, the lowest point corresponds to one of the climbing portion 2111 and the flat portion 2110, so as to avoid tip discharge between the middle portion 210. The lowest point of the first recessed area 412 on a cross section perpendicular to the driving back plate 1 is: on a cross section perpendicular to the driving back plate 1, the point where the first recessed area 412 is closest to the first electrode 21, that is, the point farthest from the flat portion 42.

[0125] It should be noted that, in the embodiment of the present disclosure, the first recessed area 412 may have multiple cross sections perpendicular to the driving backplane 1, and the lowest points on 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 it may be other points in the depth direction, depending on the position of the cross section perpendicular to the driving backplane 1.

[0126] like Figure 1 As shown, in some embodiments of the present disclosure, the first recessed area 412 has two side surfaces, including a first side surface 4121 and a second side surface 4122, wherein the first side surface 4121 is connected to the flat portion 42, and the second side surface 4122 is connected to the protruding area 411. The first side surface 4121 and the second side surface 4122 may shrink in a direction close to the driving back plate 1. The first side surface 4121 and the second side surface 4122 may be curved surfaces or flat surfaces, which are not particularly limited herein.

[0127] Further, such as Figure 1 As shown, in some embodiments of the present disclosure, the width S of the orthographic projection of the first recessed area 412 on the driving back plate 1 is not greater than 0.2 μm, that is, the maximum width of the first recessed area 412 is not greater than 0.2 μm, for example, 0.1 μm, 0.2 μm, etc. This can avoid the width of the first recessed area 412 being too large, so that the orthographic projection of the first recessed area 412 on the driving back plate 1 and the first electrode 21 have an overlap area or the overlap area is too large, further preventing the occurrence of tip discharge.

[0128] Further, such as Figure 1 As shown, in some embodiments of the present disclosure, the depth of the first recessed area 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 area 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 area 412 refers to the maximum depth of the first recessed area 412, that is, the distance between the point of the first recessed area 412 closest to the driving backplane 1 and the surface of the flat portion 42 away from the driving backplane 1 in the direction perpendicular to the driving backplane 1.

[0129] Further, in some embodiments of the present disclosure, each first recessed area 412 surrounds the middle portion 210 of a first electrode 21 in the orthographic projection of the driving backplane 1, and the minimum value of the distance between the bottom of the first recessed area 412 and the middle portion 210 of the adjacent first electrode 21 (the distance between the point of the first recessed area 412 closest to the middle portion 210 and the middle portion 210 in the direction perpendicular to the driving backplane 1) is not less than 70% of the total thickness of the flat portion 42 and the light-emitting functional layer 3, and the total thickness of the flat portion 42 and the light-emitting functional layer 3 is the sum of the thickness of the flat portion 42 and the light-emitting functional layer 3. For example, the total thickness of the flat portion 42 and the light-emitting functional layer 3 is approximately 365 nm, and the maximum value of the minimum value of the distance between the bottom of the first recessed area 412 and the middle portion 210 of the adjacent first electrode 21 in the direction perpendicular to the driving backplane 1 is approximately 255 nm.

[0130] Furthermore, the maximum value of the distance between the bottom of the first recessed area 412 and the middle portion 210 of the adjacent first electrode 21 (the distance between the point of the first recessed area 412 closest to the middle portion 210 and the middle portion 210 in the direction perpendicular to the driving backplane 1) is not less than 400nm, and the maximum value is not greater than 450nm.

[0131] Further, such as Figure 1 As shown, the slope of the first side surface 4121 relative to the middle portion 210 of the first electrode 21 is less than the slope of the second side surface 4122 relative to the middle portion 210, that is, the first side surface 4121 is flatter than the second side surface 4122. For example, the slope of the first side surface 4121 relative to the middle portion 210 may be less than 60°, for example, 50°, 45°, 40°, 30°, etc.; the slope of the second side surface 4122 relative to the middle portion 210 is not less than 60° and not greater than 90°, for example, 60°, 75°, 90°, etc. Wherein, the slope of the first side surface 4121 relative to the middle portion 210 is: the angle α between the extension surface of the first side surface 4121 and the extension surface of the middle portion 210 away from the surface of the driving back plate 1; the slope of the second side surface 4122 relative to the middle portion 210 is: the angle β between the extension surface of the second side surface 4122 and the extension surface of the middle portion 210 away from the surface of the driving back plate 1.

[0132] Furthermore, in some embodiments of the present disclosure, the slope of the first side 4121 relative to the middle portion 210 is smaller than the slope of the second side 4122 relative to the middle portion 210, and the minimum thickness of the second electrode 4 corresponding to the first side 4121 is greater than the minimum thickness of the second electrode 4 corresponding to the second side 4122.

[0133] Of course, in other embodiments of the present disclosure, the slope of the first side surface 4121 relative to the middle portion 210 may also be equal to the slope of the second side surface 4122 relative to the middle portion 210 .

[0134] In some embodiments of the present disclosure, the protruding area 411 has a second recessed area 4111 recessed toward the driving back plate 1 , and the depth of the second recessed area 4111 is smaller than the depth of the first recessed area 412 .

[0135] In order to facilitate the formation of the second electrode 4 mentioned above, in some embodiments of the present disclosure, the display panel of the present disclosure further includes a leakage cutoff layer 5, which is made of an insulating material and is disposed on the same surface of the driving backplane 1 as the first electrode layer 2, and the leakage cutoff layer 5 at least partially exposes each first electrode 21, for example, the leakage cutoff layer 5 is provided with a plurality of openings that at least partially expose the middle portion 210. The light-emitting functional layer 3 covers the leakage cutoff layer 5 and extends into the opening, thereby covering at least a portion of the middle portion 210, and the leakage cutoff layer 5 enables the light-emitting functional layer 3 to have a pit for forming the first recessed area 412 of the second electrode 4.

[0136] like Figure 1 and Figure 2 As shown, in some embodiments of the present disclosure, the leakage cutoff layer 5 includes a first limiting layer 51 and a second limiting layer 52, wherein:

[0137] The first limiting layer 51 and the first electrode layer 2 are arranged on the same surface of the driving backplane 1, and the first limiting layer 51 has a plurality of openings 511, and each first electrode 21 is arranged in each opening 511 correspondingly; a spacing area X exposing the driving backplane 1 is formed between the edge portion 211 of each first electrode 21 and the side wall of the opening 511 in which it is located.

[0138] In some embodiments of the present disclosure, the materials of the planar layer 109, the first limiting layer 301, and the second limiting layer 52 may include silicon oxide and silicon nitride, and the materials of the three are the same. For example, the planar layer 109, the first limiting layer 51, and the second limiting layer 52 are all silicon oxide. When the first limiting layer 51 is formed by an etching process, the position of the spacer region X is overetched, and the overetched area extends along the sidewall of the opening 511 into the driving back plate 1, so that at least part of the driving back plate 1 located in the spacer region X is also etched, thereby forming an annular groove 110, that is, etching the planar layer 109.

[0139] The second defining layer 52 covers the first defining layer 51 and the region of the driving backplane 1 located in the spacer region X, and at least partially exposes the middle portion 210 of the first electrode 21, and the second defining layer 52 is recessed toward the driving backplane 1 in the spacer region X and the region corresponding to the edge portion 211; and the thickness of the second defining layer 52 is less than the thickness of the first defining layer 51;

[0140] The light-emitting functional layer 3 covers the second defining layer 52, and due to the limitation of the evaporation process, the light-emitting functional layer 3 forms a pit in the area corresponding to the spacer X and the edge portion 211, and the second electrode 4 is recessed at the pit to form a first recessed area 412, so that the orthographic projection of the first recessed area 412 on the driving backplane 1 is at least partially located within the range of the spacer X or the edge portion 211, and is located outside the middle portion 210 to avoid discharge between the middle portion 210. Further, the lowest point of the first recessed area 412 on the cross section perpendicular to the driving backplane 1 is located within the range of the spacer X or the edge portion 211 when the orthographic projection of the driving backplane 1 is located.

[0141] like Figure 3 As shown, in some other embodiments of the present disclosure, the leakage cutoff layer 5 includes a first limiting layer 51 and a second limiting layer 52, wherein:

[0142] The first defining layer 51 and the first electrode layer 2 are arranged on the same surface of the driving backplane 1, and the second defining layer 52 is arranged on the surface of the first defining layer 51 away from the driving backplane 1. The first defining layer 51 and the second defining layer 52 both at least partially expose the middle part 210 of the first electrode 21, and the orthographic projection of the first defining layer 51 on the driving backplane 1 is connected to the boundary of the edge part 211 or covers the edge of the edge part 211 and the middle part 210; the boundary of the orthographic projection of the second defining layer 52 on the driving backplane 1 is located outside the middle part 210, so that the second defining layer 52 can be regarded as a ridge formed on the surface of the first defining layer 51 away from the driving backplane 1.

[0143] The light-emitting functional layer 3 covers the second defining layer 52, and due to the limitation of the evaporation process, the light-emitting functional layer 3 forms a pit on the side wall of the area where the second defining layer 52 exposes the first electrode 21, and the pit corresponds to the area of ​​the first defining layer 51 not covered by the second defining layer 52, and the orthographic projection of the driving backplane 1 is located outside the middle part 210 of the first electrode 21. At the same time, the light-emitting functional layer 3 forms a convex structure at the position corresponding to the second defining layer 52.

[0144] The first defining layer 51 and the second defining layer 52 may be made of the same material and may be formed through a single patterning process; alternatively, the first defining layer 51 and the second defining layer 52 may be formed independently and may be made of different materials.

[0145] When the second electrode 4 covers the light-emitting functional layer 3, the second electrode 4 is concave at the pit of the light-emitting functional layer 3 to form a first concave area 412, and a convex area 411 is formed at the position of the convex structure. The orthographic projection of the first concave area 412 on the driving backplane 1 is located between the middle part 210 and the orthographic projection of the second limiting layer 52 on the driving backplane 1, and the second limiting layer 52 is located within the orthographic projection of the leakage cutoff layer 5 in the convex area 411.

[0146] In addition, if Figure 1 and Figure 3 As shown, the first display panel of the present disclosure may further include a first encapsulation layer 6, a color film layer 7, a second encapsulation layer 8 and a transparent cover plate 9, wherein:

[0147] The first encapsulation layer 6 may cover the second electrode 4 . For example, the first encapsulation layer 6 may include two inorganic layers and an organic layer between the two inorganic layers.

[0148] The color filter layer 7 is disposed on a side of the first encapsulation layer 6 away from the second electrode 4 , and the color filter layer 7 includes filter areas corresponding to the first electrodes 21 one by one. The filter areas have multiple colors, such as red, blue and green.

[0149] The second encapsulation layer 8 may cover the color filter layer 7 , and its structure may be the same as that of the first encapsulation layer 6 .

[0150] The transparent cover plate 9 can cover the second encapsulation layer 8 and its material can be glass or material.

[0151] The second display panel

[0152] like Figure 4 As shown, the display panel includes a driving backplane 100, a first electrode layer 200, a leakage cutoff layer 300, a light-emitting functional layer 400 and a second electrode 500, wherein:

[0153] The first electrode layer 200 is arranged on one side 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 a climbing portion 2111 connected between the middle portion 210 and the flat portion 2110, and the thickness of the flat portion 2110 is less than that of the middle portion 210.

[0154] The leakage cutoff layer 300 and the first electrode layer 200 are arranged on the same surface of the driving back plate 100, and the leakage cutoff layer 300 includes a first limiting layer 301 and a second limiting layer 302 which are sequentially stacked in a direction away from the driving back plate 100, the first limiting layer 301 is provided with a first opening 3011 corresponding to each other and exposing the middle part 210 of each first electrode 201, the second limiting layer 302 is provided with a second opening 3021 surrounding the first opening 3011 at a position corresponding to the first opening 3011, and the second limiting layer 302 is arranged at intervals from the middle part 210 in the orthographic projection of the driving back plate 100; the first limiting layer 301 is provided with a plurality of annular holes 3012 of blind hole structure surrounding each first opening 3011 in a one-to-one correspondence, and the second limiting layer 302 is arranged on the surface of the first limiting layer 301 away from the driving back plate 100, and is located outside the annular hole 3012;

[0155] The light emitting functional layer 400 at least partially covers the leakage cutoff layer 300 and the middle portion 210 of the first electrode 201;

[0156] The second electrode 500 covers the light emitting functional layer 400 .

[0157] In the display panel of the embodiment of the present disclosure, each first electrode 201 and its corresponding light-emitting functional layer 400 and second electrode 500 can constitute a light-emitting device to emit light.

[0158] Since the second opening 3021 surrounds the outside of the first opening 3011, that is, the second opening 3021 is larger than the first opening 3011, the two can form a stepped hole, so that the first defining layer 301 has an area located in the second opening 3021 and exposed by the second opening 3021. At the same time, since the orthographic projection of the second defining layer 302 on the driving back plate 100 is spaced from the middle part 210 of the first electrode 201 and is located outside the annular hole 3012. If the light-emitting functional layer 400 forms a pit in the area contacting the side wall of the second opening 3021 due to process problems, the pit can be made to at least partially correspond to the annular hole 3012 of the first defining layer 301 exposed by the second opening 3021, and will not correspond to the middle part 210 of the first electrode 201.

[0159] Correspondingly, the lowest point of the concave area 501 formed after the second electrode 500 is concave at the pit on the cross section perpendicular to the driving backplane 1 does not correspond to the middle part 210, that is, the orthographic projection of the lowest point of the concave area 501 of the second electrode 500 on the cross section perpendicular to the driving backplane 1 on the driving backplane 100 is located outside the middle part 210, that is, outside the light-emitting device, thereby preventing the occurrence of tip discharge or even short circuit between the concave area 501 and the middle part 210 of the first electrode 201, which is conducive to ensuring stable light emission of the light-emitting device. At the same time, light emission within the range of the concave area 501 can be avoided, thereby reducing the mutual interference of light emission of adjacent light-emitting devices.

[0160] The following is a detailed description of the various parts of the second display panel in the embodiment of the present disclosure.

[0161] like Figure 4As shown, the driving backplane 100 may include a plurality of driving transistors for driving each light-emitting device to emit light to display an image. Taking a driving transistor with a top gate structure as an example, the driving backplane 100 includes a substrate 101, a gate insulating layer 103, a gate 104, a first insulating layer 105 and a first wiring layer 106, wherein: the material of the substrate 101 may be single crystal silicon or polycrystalline silicon, etc., which is not specifically limited here; the substrate 101 may include an active area 102 and a source 1021 and a drain 1022 located at both ends of the active area 102. The gate insulating layer 103 covers the active area 102; the gate 104 is arranged on the surface of the gate insulating layer 103 away from the substrate 101. The first insulating layer 105 covers the gate 104 and the substrate 101, and its material may include at least one of silicon oxide and silicon nitride. The first wiring layer 106 is disposed on a surface of the first insulating layer 105 away from the substrate 101 , and the gate 104 , the source 1021 and the drain 1022 are all connected to the first wiring layer 106 through vias filled with tungsten or other metals.

[0162] In addition, the driving backplane 100 may also 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 arranged on the 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, and it can be connected to the first wiring layer 106 through a via filled with tungsten or other metals. At the same time, the second wiring layer 108 can be covered with a flat layer 109, the first electrode layer 200 can be arranged on the surface of the flat layer 109 away from the substrate 101, and the first electrode 201 can be connected to the second wiring layer 108 through a via filled with tungsten or other metals.

[0163] like Figure 4 As shown, the first electrode layer 200 is disposed on one side of the driving backplane 100 and includes a plurality of first electrodes 201, which are arranged in an array. For example, each first electrode 201 of the first electrode layer 200 is arranged in an array on the surface of the flat layer 109 away from the substrate 101, and adjacent first electrodes 201 are arranged at intervals.

[0164] 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, wherein the middle portion 210 is a flat structure, that is, the middle portion 210 is substantially parallel to the driving backplane 100. For example, the middle portion 210 is disposed on a surface of the flat layer 109 facing away from the substrate 101, and is parallel to the surface of the flat layer 109 facing away from the substrate 101.

[0165] The edge portion 211 may include a flat portion 2110 and a climbing portion 2111, wherein the flat portion 2110 is located on the driving back plate 100 and is disposed around the middle portion 210, and the flat portion 2110 is substantially parallel to the driving back plate 100. For example, the flat portion 2110 is located on the 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. At the same time, the thickness of the flat portion 2110 is less than the thickness of the middle portion 210.

[0166] The climbing portion 2111 is connected between the middle portion 210 and the flat portion 2110, that is, the climbing portion 2111 surrounds the middle portion 210, and the flat portion 2110 is arranged around the climbing portion 2111. The slope of the climbing portion 2111 relative to the driving back plate 100 is not less than 30°, and the slope is the angle between the surface of the climbing portion 2111 and the driving back plate 100.

[0167] In some embodiments of the present disclosure, the first electrode 201 includes a flat middle portion 210 and an edge portion 211 surrounding the middle portion 210 , and the direct projection of the lowest point of the recessed area 501 on the cross section perpendicular to the driving backplane 1 on the driving backplane 100 is located outside the middle portion 210 of the first electrode 201 .

[0168] 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 arranged on the surface of the flat layer 109 away from the substrate 101, the second conductive layer 221 is arranged on the surface of the first conductive layer 220 away from the driving backplane 100, and the third conductive layer 222 is arranged on the surface of the second conductive layer 221 away from the driving backplane 100, and extends to the driving backplane 100 with a certain slope, thereby covering the first conductive layer 220 and the second conductive layer 221 to protect the first conductive layer 220 and the second conductive layer 221.

[0169] The middle portion 210 of the first electrode 201 includes a region where the third conductive layer 222 is located on the surface of the second conductive layer 221 away from the driving backplane 100, and the first conductive layer 220 and the second conductive layer 221. The edge portion 211 includes a region where the third conductive layer 222 covers the edges of the first conductive layer 220 and the second conductive layer 221, that is, a region extending toward the driving backplane 100. Exemplarily, the material of the first conductive layer 220 may include titanium (Ti), the material of the second conductive layer 221 may include silver (Ag), and the material of the third conductive layer 222 may include indium tin oxide (ITO). Of course, other materials may also be used.

[0170] like Figure 4 As shown, the leakage cutoff layer 300 is made of 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 planar layer 109 facing away from the substrate 101 .

[0171] The leakage cutoff layer 300 includes a first limiting layer 301 and a second limiting layer 302, wherein:

[0172] The first defining layer 301 and the first electrode layer 200 are disposed on the same surface of the driving backplane 100, and the first defining layer 301 is provided with first openings 3011 corresponding to each other to expose the middle portions 210, and at least a part of the middle portion 210 is exposed, and the first defining layer 301 covers the edge portion 211. In some embodiments of the present disclosure, the first defining layer 301 may cover the edge of the first opening 3011 and may overlap with the edge of the middle portion 210, and the thickness of the first defining layer 301 may be greater than, equal to, or less than the thickness of the first electrode 201. In addition, in other embodiments of the present disclosure, the first opening 3011 may also be smaller than the middle portion 210, and the thickness of the first defining layer 301 is greater than the thickness of the middle portion 210, so that the first defining layer 301 covers the edge of the middle portion 210 of the first electrode 201 and the edge portion 211, thereby preventing the burrs at the edge of the first electrode 201 from generating tip discharge.

[0173] like Figure 6 and Figure 7 As shown, the first limiting layer 301 may be provided with a plurality of annular holes 3012 surrounding each first opening 3011 in a one-to-one correspondence, and the annular holes 3012 are blind hole structures, that is, they are recessed toward the driving back plate 100, but do not expose the driving back plate 100. The second limiting layer 302 is provided in the area of ​​the surface of the first limiting layer 301 away from the driving back plate 100 that is not surrounded by the annular holes 3012, that is, outside the annular holes 3012, so as not to block the annular holes 3012. The provision of the annular holes 3012 is conducive to further cutting off the charge generation layer 402 of the light-emitting functional layer 400, and avoiding crosstalk between adjacent light-emitting devices.

[0174] The second defining layer 302 is disposed on the surface of the first defining layer 301 away from the driving back plate 100, and the orthographic projection of the second defining layer 302 on the driving back plate 100 is spaced apart from the middle portion 210 of the first electrode 201, so that the orthographic projection of the second defining layer 302 on the driving back plate 100 is located outside the middle portion 210. At the same time, the second defining layer 302 is provided with a second opening 3021 surrounding the first opening 3011 at a position corresponding to the first opening 3011, so that any first opening 3011 and the second opening 3021 surrounding the first opening 3011 can form a step hole, and the second opening 3021 exposes the area of ​​the first defining layer 301 located within the second opening 3021.

[0175] The first defining layer 301 and the second defining layer 302 may be made of the same material and may be formed through a single patterning process; alternatively, the first defining layer 301 and the second defining layer 302 may be formed independently and may be made of different materials.

[0176] like Figure 4 As shown, 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. In one embodiment of the present disclosure, Figure 4 As shown, the light-emitting functional layer 400 includes multiple light-emitting unit layers 401, and the hole injection layer, hole transport layer, light-emitting layer, electron transport layer and electron injection layer of each light-emitting unit layer 401 are distributed in the same manner. 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 through the charge generation layer 402 to form a series-type OLED light-emitting device.

[0177] In some other embodiments of the present disclosure, the light-emitting functional layer 400 includes a 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 stacked in sequence from the first electrode 201 to the direction away from the driving backplane 100.

[0178] When the light-emitting functional layer 400 is formed by the evaporation process, the edge of the portion 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, which may correspond to the annular hole 3012 exposed by the second opening 3021. At the same time, the light-emitting functional layer 400 forms a convex structure in the area corresponding to the second defining layer 302.

[0179] like Figure 4 As shown, 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 to make the portion of the light-emitting functional layer 400 between the first electrode 201 and the second electrode 500 emit light.

[0180] The morphology of the second electrode 500 matches the light-emitting functional layer 400. It is sunken at the pit of the light-emitting functional layer 400 to form a sunken area 501, and forms a convex area 502 in the area corresponding to the convex structure of the second limiting layer 302. The correspondence between the sunken area 501 and the annular hole 3012 makes the positive projection of the sunken area 501 on the driving backplane 100 at least partially located outside the middle part 210 of the first electrode 201, reducing or avoiding the occurrence of tip discharge with the first electrode 201 and the sunken area 501 of the second electrode 500. In addition, the area of ​​the second electrode 500 corresponding to the middle part 210 is a flat area 503. The connection relationship between the sunken area 501, the convex area 502 and the flat area 503 can refer to the convex area 411, the first sunken area 412 and the flat part 42 in the above-mentioned first display panel embodiment, and will not be described in detail here.

[0181] Further, such as Figure 4 and Figure 5As shown, in some embodiments of the present disclosure, in order to ensure that the lowest point of the recessed area 501 of the second electrode 500 on the cross section perpendicular to the driving backplane 1 is completely located outside the middle portion 210 in the orthographic projection of the driving backplane 100, the spacing L between the side wall 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 not less than 1 / 5 of the maximum spacing H between the middle portions 210 of two adjacent first electrodes 201. For example, the maximum spacing between two adjacent middle portions 210 is 1 μm, and L is 0.2 μm, 0.1 μm, etc., so that the orthographic projection of the recessed area 501 on the first limiting layer 301 is located between the side wall of the second opening 3021 and the middle portion 210, that is, the orthographic projection of the recessed area 501 on the driving backplane 100 is completely located outside the middle portion 210, further avoiding the occurrence of tip discharge.

[0182] In other embodiments of the present disclosure, Figure 4 As shown, the sidewall of the second opening 3021 may be perpendicular to the driving backplate 100 , so that the cross section of the portion of the second defining layer 302 located between the two middle portions 210 is rectangular.

[0183] In other embodiments of the present disclosure, Figure 8 As shown, the side wall of the second opening 3021 expands in a direction away from the driving back plate 100, so that the cross section of the second limiting layer 302 located between the two middle parts 210 is trapezoidal. At the same time, the angle between the side wall of the second opening 3021 and the middle part 210, that is, the angle γ between the extended surface of the side wall of the second opening 3021 and the extended surface of the middle part 210 away from the driving back plate 100, is not less than 60° and not more than 90°, for example, 60°, 65°, 70°, 80° or 90°.

[0184] For a series OLED display panel, in order to avoid crosstalk between two adjacent light-emitting devices, the charge generation layer 402 of the light-emitting device can be cut off by the leakage cutoff layer 300. Of course, the hole injection layer or other film layers can also be cut off to prevent crosstalk.

[0185] like Figure 4 As shown, in some embodiments of the present disclosure, the light-emitting functional layer 400 includes multiple light-emitting unit layers 401, and the hole injection layer, hole transport layer, light-emitting layer, electron transport layer and electron injection layer of each light-emitting unit layer 401 are distributed in the same manner. 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 through the charge generation layer 402 to form a series-type OLED light-emitting device.

[0186] In the direction perpendicular to the driving backplane 100, the distance between the surface of the second defining 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, that is, the height of the second defining layer 302 relative to the middle portion 210, is not less than 25% of the thickness of the light-emitting functional layer 400, and not more than 80% of the thickness of the light-emitting functional layer 400. The step difference formed by the second defining layer 302 can disconnect the film layers with strong conductivity such as the charge generation layer 402 or the hole injection layer of the light-emitting functional layer 400, thereby avoiding crosstalk between adjacent light-emitting devices. For example, if the thickness of the light-emitting functional layer 400 is 400nm, the height of the second defining layer 302 relative to the middle portion 210 is not more than 320nm, and not less than 100nm. If the thickness of the light-emitting functional layer 400 is 300nm, the height of the second defining layer 302 relative to the middle portion 210 is not more than 75nm, and not less than 25nm.

[0187] Further, such as Figure 4 , Figure 6 and Figure 7 As shown, the second limiting layer 302 may be provided with a groove 3022 in the area outside the second opening 3021, and the charge generation layer 402 may be blocked by the groove 3022, which is conducive to further cutting off the charge generation layer 402 and better preventing crosstalk. The shape and structure of the groove 3022 are not specifically limited here, and its depth is less than the depth of the recessed area 501. The number of the grooves 3022 may be one, or may be a plurality of grooves distributed in concentric rings.

[0188] Further, such as Figure 4 As shown, the width of the groove 3022 is smaller than the distance between the middle portions 210 of two adjacent first electrodes 201. For example, if the distance between the two adjacent middle portions 210 is 0.1 μm-1 μm, the maximum width of the groove 3022 is 1 μm. At the same time, in order to ensure the truncation effect of the groove 3022, the width of the groove 3022 can be greater than 0.2 μm, so that the groove 3022 has a certain span, so that the charge generation layer 402 can be truncated due to the existence of the groove 3022.

[0189] In addition, the first display panel of the present disclosure may further include a first encapsulation layer 600, a color film layer 700, a second encapsulation layer 800 and a transparent cover plate 900, wherein 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 between the two inorganic layers.

[0190] The color filter layer 700 is disposed on a side of the first encapsulation layer 600 away from the second electrode 500 , and the color filter layer 700 includes filter areas corresponding to the first electrodes 201 . The filter areas have multiple colors, such as red, blue and green.

[0191] The second encapsulation layer 800 may cover the color filter layer 700 , and its structure may be the same as that of the first encapsulation layer 600 .

[0192] The transparent cover plate 900 may cover the second encapsulation layer 800 , and the material thereof may be glass or other materials.

[0193] The third display panel

[0194] like Fig. 9 and Fig.10 As shown, the third display panel may include a driving backplane 100, a first electrode layer 200, a leakage cutoff layer 300, a light-emitting functional layer 400 and a second electrode 500, wherein:

[0195] The first electrode layer 200 is disposed on one side 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 a climbing portion 2111 connected between the middle portion 210 and the flat portion 2110, and the thickness of the flat portion 2110 is less than that of the middle portion 210.

[0196] The leakage cutoff layer 300 includes a first defining layer 301 and a second defining layer 302. The first defining layer 301 and the first electrode layer 200 are arranged on the same surface of the driving backplane 100 and have a plurality of openings 3011. Each first electrode 201 is arranged in each opening 3011 in a one-to-one correspondence, that is, a first electrode 201 is arranged in each opening 3011 of the first defining layer 301. A spacing area X exposing the driving backplane 100 is formed between the edge portion 211 of each first electrode 201 and the side wall of the opening 3011 in which it is located. The second defining layer 302 covers the first defining layer 301 and the driving backplane 100 located in the spacing area X, and exposes the middle portion 210 of the first electrode 201. The second defining layer 302 is recessed toward the driving backplane 100 in the spacing area X and the area corresponding to the edge portion 211, that is, the second defining layer 302 conforms to the surface of the first defining layer 301 and the driving backplane 100.

[0197] The light-emitting functional layer 400 at least covers the second defining layer 302 and the middle portion 210 of the first electrode 201 ; and the second electrode 500 covers the light-emitting functional layer 400 .

[0198] In the third display panel disclosed in the present invention, since the second limiting layer 302 is recessed toward the driving backplane 100 in the spacer region X, the pit formed by the light-emitting functional layer 400 due to the process problem can be located at a position corresponding to the spacer region X or the edge portion 211, and not corresponding to the middle portion 210. Accordingly, the recessed region 501 formed after the second electrode 500 is recessed at the pit does not correspond to the middle portion 210, that is, the orthographic projection of the lowest point of the recessed region 501 of the second electrode 500 on the cross section perpendicular to the driving backplane 1 on the driving backplane 100 is located outside the middle portion 210, that is, outside the light-emitting device, thereby preventing the second electrode 500 from having a tip discharge or even a short circuit between the recessed region 501 and the middle portion 210, which is conducive to ensuring stable light emission of the light-emitting device. At the same time, light emission within the range of the recessed region 501 can be avoided, thereby reducing the mutual interference of light emission of adjacent light-emitting devices.

[0199] The third display panel is described in detail below.

[0200] like Fig. 9 and Fig.10 As shown, the specific structure of the driving backplane 100 and the first electrode layer 200 of the third display panel can refer to the above-mentioned second display panel, and will not be described in detail here.

[0201] In some embodiments of the present disclosure, the driving backplane 100 includes a substrate 101, a driving transistor and a planar layer 109, wherein: the substrate 101 may be a silicon substrate, and the driving transistor is disposed on one side of the substrate 101; the planar layer 109 is disposed on the side of the driving transistor away from the substrate 101; the first electrode layer 200 and the leakage cutoff layer 300 are disposed on the surface of the planar layer 109 away from the substrate 101.

[0202] Specifically, the driving backplane 100 may be a silicon-based backplane, which may include a substrate 101, a gate insulating layer 103, a gate 104, a first insulating layer 105, a first wiring layer 106, a second insulating layer 107, a second wiring layer 108 and a flat layer 109. The substrate 101 includes an active area 102, and the active area 102 has a source 1021 and a drain 1022. The specific structure may refer to the embodiment of the second display panel. The first limiting layer 301 and the first electrode 201 may be arranged on the surface of the flat layer 109 away from the substrate 101. The materials of the flat layer 109, the first limiting layer 301 and the second limiting layer 302 may all include insulating materials such as silicon oxide and silicon nitride.

[0203] In some embodiments of the present disclosure, the thickness of the first defining layer 301 may be greater than that of the first electrode layer 200 so as to cut off the film layers such as the hole injection layer in the light-emitting functional layer 400 that can generate crosstalk between two adjacent sub-pixels.

[0204] In some embodiments of the present disclosure, 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 disposed on the surface of the flat layer 109 away from the substrate 101, the second conductive layer 221 is disposed on the surface of the first conductive layer 220 away from the driving backplane 100, and the third conductive layer 222 is disposed on the surface of the second conductive layer 221 away from the driving backplane 100, and extends to the driving backplane 100 with a certain slope, thereby covering the first conductive layer 220 and the second conductive layer 221, and protecting the first conductive layer 220 and the second conductive layer 221. Among them, the middle portion 210 of the first electrode 201 includes the area where the third conductive layer 222 is located on the surface of the second conductive layer 221 away from the driving backplane 100 and the first conductive layer 220 and the second conductive layer 221, and the edge portion 211 includes the area where the third conductive layer 222 covers the edges of the first conductive layer 220 and the second conductive layer 221, that is, the area extending to the driving backplane 100. Exemplarily, the material of the first conductive layer 220 may include titanium (Ti), the material of the second conductive layer 221 may include silver (Ag), and the material of the third conductive layer 222 may include indium tin oxide (ITO). Of course, other materials may also be used.

[0205] In some embodiments of the present disclosure, the thickness of the second defining layer 302 is less than that of the first defining layer 301. Further, the thickness of the second defining layer 302 may be less than 1 / 5 of the thickness of the first defining layer 301, so as to avoid filling the spacer X and the edge portion 211 and failing to form a concave structure. For example, the thickness of the first defining layer 301 is about 350 nm, and the thickness of the second defining layer 302 is not greater than 70 nm, for example, the thickness of the second defining layer 302 is 60 nm, 50 nm, etc.

[0206] In some embodiments of the present disclosure, the driving backplane 100 is provided with an annular groove 110 surrounding the first electrode 201 in each spacer region X, and the portion of the second limiting layer 302 located in the spacer region X is recessed into the annular groove 110. For example, the annular groove 110 is formed on the flat layer 109, and the depth of the annular groove 110 is less than the thickness of the flat layer 109, and the specific thickness is not particularly limited herein.

[0207] Specifically, the materials of the flat layer 109, the first limiting layer 301, and the second limiting layer 302 may include silicon oxide and silicon nitride, and the materials of the three are the same. For example, the flat layer 109, the first limiting layer 301, and the second limiting layer 302 are all silicon oxide. When the first limiting layer 301 is formed by an etching process, the position of the spacer X is overetched, and the overetched area extends along the side wall of the opening 3011 into the driving backplane 100, so that at least part of the area of ​​the driving backplane 100 located in the spacer X is also etched, thereby forming an annular groove 110, that is, etching the flat layer 109. In some embodiments of the present disclosure, the positive projection of the annular groove 110 on the driving backplane 100 coincides with the spacer X, that is, the side wall of the annular groove 110 is the boundary of the spacer X. Of course, the over-etched area may be smaller than the spacing area X, so that the sidewall of the annular groove 110 may have a certain distance from the edge portion 211 of the first electrode 201. In some embodiments of the present disclosure, the slope α of the area of ​​the second electrode 500 covering the sidewall of the opening 3011 relative to the middle portion 210 of the first electrode 201 is not less than 65° and not greater than 90°, such as 60°, 75°, 90°, etc. The slope β of the area of ​​the second electrode 500 located between the middle portion 210 and the annular groove 110 relative to the middle portion 210 is less than 60°, such as 50°, 45°, 40°, 30°, etc.

[0208] like Fig. 9 and Fig.10 As shown, the light-emitting functional layer 400 covers at least part of the second defining layer 302 and the first electrode 201. When the light-emitting functional layer 400 is formed by an evaporation process, the portion of the light-emitting functional layer 400 located in the spacer region X is recessed toward the driving backplane 100 to form a pit. At the same time, the light-emitting functional layer 400 forms a convex structure corresponding to the region of the first defining layer 301. The specific details of the light-emitting functional layer 400 can refer to the implementation of the second display panel, and will not be described in detail here.

[0209] like Fig. 9 and Fig.10As shown, the second electrode 500 covers the light-emitting functional layer 400 and is recessed at the pit of the light-emitting functional layer 400 to form a recessed area 501. Due to the limitation of the pit, the positive projection of the lowest point of the recessed area 501 on the driving backplane 100 at the cross section perpendicular to the driving backplane 1 is located within the range of the spacing area X or the edge portion 211, that is, outside the middle portion 210, that is, outside the light-emitting device, thereby preventing the second electrode 500 from having a tip discharge or even a short circuit between the recessed area 501 and the first electrode 201, which is conducive to ensuring stable light emission of the light-emitting device. At the same time, light emission within the range of the recessed area 501 can be avoided, thereby reducing the mutual interference of light emission of adjacent light-emitting devices. In addition, the area of ​​the second electrode 500 corresponding to the first limiting layer 301 is the protruding area 502, and the area of ​​the second electrode 500 corresponding to the middle portion 210 is the flat area 503. The connection relationship among the recessed area 501 , the protruding area 502 and the flat area 503 may refer to the protruding area 411 , the first recessed area 412 and the flat portion 42 in the first embodiment of the display panel described above, and will not be described in detail here.

[0210] In addition, if Fig. 9 and Fig.10 As shown, the display panel of the present disclosure may further 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 above-mentioned first and second display panel implementations, which will not be described in detail here.

[0211] The present disclosure also provides a method for manufacturing a display panel, wherein the display panel may be the second display panel described above. Fig.11 As shown, the manufacturing method includes steps S110 to S140, wherein:

[0212] Step S110, forming a first electrode layer on one side of the driving backplane, wherein the first electrode layer includes a plurality of first electrodes distributed in an array; 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 a climbing portion connected between the middle portion and the flat portion, and the thickness of the flat portion is smaller than that of the middle portion;

[0213] Step S120, forming a leakage cutoff layer on a side of the driving back plate provided with the first electrode layer, the leakage cutoff layer comprising a first limiting layer and a second limiting layer sequentially stacked in a direction away from the driving back plate, the first limiting layer being provided with first openings corresponding to each other to expose each of the first electrodes, the second limiting layer being provided with a second opening surrounding the first opening at a position corresponding to the first opening, the second limiting layer being distributed at intervals between the orthographic projection of the driving back plate and the middle part; the first limiting layer being provided with a plurality of annular holes of a blind hole structure corresponding to each of the first openings, the second limiting layer being provided on a surface of the first limiting layer away from the driving back plate and being located outside the annular holes;

[0214] Step S130, forming a light-emitting functional layer that at least covers the leakage cutoff layer and the middle portion;

[0215] Step S140: forming a second electrode covering the light-emitting functional layer.

[0216] In some embodiments of the present disclosure, a leakage cutoff layer is formed on a side of the driving backplane provided with the first electrode layer, that is, step S120, including:

[0217] Step S1210, forming a first limiting layer on a side of the driving back plate provided with the first electrode layer, wherein the first limiting layer is provided with first openings corresponding to each other to expose each first electrode and a plurality of annular holes of blind hole structures corresponding to each other surrounding each first opening;

[0218] Step S1220, forming a second defining layer on the surface of the first defining layer away from the driving back plate, the second defining layer having a second opening surrounding the first opening at a position corresponding to the first opening, the second defining layer being spaced apart from the middle portion of the orthographic projection of the driving back plate, and the second defining layer being arranged on the surface of the first defining layer away from the driving back plate and outside the annular hole.

[0219] The details of each layer structure and beneficial effects of the manufacturing method of the embodiment of the present disclosure have been described in the above embodiment of the second display panel and will not be repeated here.

[0220] In some embodiments of the present disclosure, the first defining layer and the second defining layer may be formed at one time by a grayscale mask process or other patterning process; of course, they may also be formed separately and independently, which is not particularly limited here.

[0221] The present disclosure also provides a method for manufacturing a display panel, wherein the display panel may be the third display panel described above. Fig.12 As shown, the manufacturing method includes steps S210 to S250, wherein:

[0222] Step S210, forming a first electrode layer on one side of the driving backplane, wherein the first electrode layer includes a plurality of first electrodes distributed in an array; 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 a climbing portion connected between the middle portion and the flat portion, and the thickness of the flat portion is smaller than that of the middle portion;

[0223] Step S220, forming a first limiting layer on a side of the driving backplane provided with the first electrode layer, wherein the first limiting layer has a plurality of openings, and each of the first electrodes is provided in each of the openings in a one-to-one correspondence; and forming a spacing area for exposing the driving backplane between each of the edge portions and the side wall of the opening in which the edge portion is located;

[0224] Step S230, forming a second defining layer covering the first defining layer and the driving back plate located in the spacing area, wherein the second defining layer at least partially exposes the middle portion and is recessed toward the driving back plate in the spacing area and the area corresponding to the edge portion;

[0225] Step S240, forming a light-emitting functional layer that at least partially covers the second defining layer and the middle portion;

[0226] Step S250: forming a second electrode covering the light-emitting functional layer.

[0227] The details of each layer structure and beneficial effects of the manufacturing method of the embodiment of the present disclosure have been described in the above third display panel embodiment and will not be repeated here.

[0228] It should be noted that, although the steps of the method in the present disclosure are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0229] The present disclosure also provides a display device, which may include any one of the first display panel, the second display panel, and the third display panel. The specific structures of the first display panel to the third display panel can refer to the above embodiments and will not be repeated here. The display device of the present disclosure can be used in electronic devices such as mobile phones, tablet computers, and televisions.

[0230] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A display panel, characterized in that: include: Driver backplane; A first electrode layer is provided on one side of the driving backplane and includes a plurality of first electrodes distributed in an array, wherein the first electrode includes a flat middle portion and an edge portion surrounding the middle portion; A light-emitting functional layer at least partially covers the middle portion; The second electrode covers the light-emitting functional layer and includes a partition and a plurality of flat portions separated by the partition, wherein the orthographic projections of the flat portions on the driving backplane are located one by one within the first electrodes; the partition includes a protruding area and a first recessed area connecting the protruding area and the flat portion, wherein the first recessed area is recessed toward a side of the flat portion close to the driving backplane, and the protruding area protrudes toward a side of the flat portion away from the driving backplane, and the protruding area has a second recessed area recessed toward the driving backplane.

2. The display panel according to claim 1, characterized in that: On a cross section perpendicular to the driving back plate, the lowest point of the second recessed area is located on a side of the lowest point of the first recessed area away from the driving back plate.

3. The display panel according to claim 1, characterized in that: The width of the first concave region is smaller than the width of the convex region.

4. The display panel according to claim 1, characterized in that: The first concave area includes a first side surface connected to the flat portion and a second side surface connected to the convex area, and the first side surface and the second side surface shrink in a direction approaching the driving back plate.

5. The display panel according to claim 4, characterized in that: 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.

6. The display panel according to claim 4, characterized in that: A minimum thickness of the second electrode in a region corresponding to the first side surface is greater than a minimum thickness of the second electrode in a region corresponding to the second side surface.

7. The display panel according to claim 5, characterized in that: The slope of the first side surface relative to the middle portion is less than 60°; the slope of the second side surface relative to the middle portion is not less than 60° and not greater than 90°.

8. The display panel according to claim 1, characterized in that: The width of the orthographic projection of the first recessed area on the driving backplane is no greater than 0.2 μm.

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

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

11. The display panel according to claim 1, characterized in that: The depth of the second recessed area is smaller than the depth of the first recessed area.

12. The display panel according to claim 1, characterized in that: The display panel further includes: A leakage cutoff layer, which is arranged on the same surface of the driving backplane as the first electrode layer, and the light-emitting functional layer covers the leakage cutoff layer; The orthographic projection of the first recessed area on the driving backplane is located within the orthographic projection of the leakage cutoff layer on the driving backplane.

13. The display panel according to claim 12, characterized in that: On a cross section perpendicular to the driving backplane, an orthographic projection of the lowest point of the first recessed area on the driving backplane is located within an orthographic projection of the leakage cutoff layer on the driving backplane.

14. The display panel according to claim 13, characterized in that: The minimum value of the distance between the bottom of the first recessed area and the middle portion of the adjacent first electrode along the direction perpendicular to the driving backplane is not less than 70% of the total thickness of the flat portion and the light-emitting functional layer.

15. The display panel according to claim 1, characterized in that: The protruding area has a second recessed area recessed toward the driving back plate, and a depth of the second recessed area is smaller than a depth of the first recessed area.

16. The display panel according to any one of claims 1 to 11, characterized in that: The display panel further includes: A leakage cutoff layer, which is arranged on the same surface of the driving backplane as the first electrode layer, and the light-emitting functional layer covers the leakage cutoff layer; The leakage cutoff layer comprises a first limiting layer and a second limiting layer stacked in sequence in a direction away from the driving back plate, wherein the first limiting layer and the second limiting layer at least partially expose the middle portion of the first electrode, and the boundary of the orthographic projection of the second limiting layer on the driving back plate is located outside the middle portion; On a cross section perpendicular to the driving back plate, the lowest point of the first recessed area is located between the middle portion and the orthographic projection of the second limiting layer on the driving back plate; the second limiting layer is located within the orthographic projection of the leakage cutoff layer in the protruding area.

17. The display panel according to any one of claims 1 to 11, characterized in that: The display panel further includes: The leakage cutoff layer includes a first limiting layer and a second limiting layer, wherein the first limiting layer and the first electrode layer are arranged on the same surface of the driving back plate and have a plurality of openings, and each of the first electrodes is arranged in each of the openings in a one-to-one correspondence; a spacing area for exposing the driving back plate is formed between the edge of each of the first electrodes and the side wall of the opening where the first electrode is located; The second defining layer covers the first defining layer and the driving backplane located in the spacing area and at least partially exposes the middle portion of the first electrode, and the second defining layer is recessed toward the driving backplane in the spacing area and the area corresponding to the edge portion; the thickness of the second defining layer is less than the thickness of the first defining layer; The light-emitting functional layer covers the second defining layer.

18. A display device, characterized in that: A display panel comprising any one of claims 1-17.

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