Display panel, manufacturing method thereof and display device

Abstract

This disclosure provides a display panel and its manufacturing method, as well as a display device, belonging to the field of display technology. The display panel includes a substrate (1) and a light-emitting structure (3). The light-emitting structure (3) includes a pixel defining structure (38), a reflective layer (32), and a first conductive layer (33). The reflective layer (32) includes a plurality of spaced-apart reflective portions (321); the first conductive layer (33) includes a plurality of spaced-apart first conductive portions (331). In a direction parallel to the substrate (1), a gap is provided between the side of the reflective portion (321) or the first conductive portion (331) near the pixel defining structure (38) and the side of the corresponding pixel defining structure (38) near the reflective portion (321) or the first conductive portion (331).

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display panel, a method for manufacturing the same, and a display device. Background Technology

[0002] The fabrication methods for organic functional thin film layers in organic light-emitting diodes (OLEDs) are divided into vacuum thermal deposition and solution-casting methods. Solution-casting methods are further subdivided into spin coating, ink-jet printing, and screen printing.

[0003] Inkjet printing uses a solvent to melt the organic material of an OLED, and then directly sprays the material onto the surface of a substrate to form a light-emitting functional layer. However, due to the inherent characteristics of the printing technology, the formed light-emitting functional layer may suffer from uneven light emission due to effects such as the coffee ring effect, which can affect the film quality.

[0004] The information disclosed in the background section is only for enhancing the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to provide a display panel that enhances the luminous intensity in the central region of the light-emitting device, thereby reducing the impact of the edge region on display quality to a relatively certain extent.

[0006] To achieve the above-mentioned objectives, the present disclosure adopts the following technical solution:

[0007] According to a first aspect of this disclosure, a display panel is provided, including a substrate and a light-emitting structure disposed on one side of the substrate, the light-emitting structure comprising:

[0008] A pixel defining structure is disposed on one side of the substrate, the pixel defining structure defining a plurality of pixel regions arranged in an array;

[0009] A reflective layer is disposed on one side of the substrate, the reflective layer comprising a plurality of spaced reflective portions located within the pixel region;

[0010] A first conductive layer is disposed on the side of the reflective layer away from the substrate, and the first conductive layer includes a plurality of spaced first conductive portions;

[0011] A hole injection layer is disposed on the side of the first conductive layer away from the substrate. The hole injection layer includes a first sub-part and a second sub-part, the first sub-part being located in the middle portion of the pixel region, and the second sub-part being located in the edge portion of the pixel region. The distance between the middle portion of the pixel region and the pixel defining structure is not less than the distance between the edge portion of the pixel region and the pixel defining structure. In a direction perpendicular to the substrate, at least a portion of the second sub-part has a larger size than the first sub-part.

[0012] The reflective portion and the first conductive portion correspond one-to-one, and the orthographic projections of the first conductive portion and the reflective portion on the substrate at least partially overlap.

[0013] In a direction parallel to the substrate, a gap is provided between the side of the reflective portion or the first conductive portion near the pixel defining structure and the side of the corresponding pixel defining structure near the reflective portion or the first conductive portion.

[0014] In one exemplary embodiment of this disclosure, the orthographic projection of the first sub-part on the substrate overlaps with the orthographic projection of the reflective part on the substrate, while the orthographic projection of the second sub-part on the substrate does not overlap with the orthographic projection of the reflective part on the substrate; or the orthographic projection of the first sub-part on the substrate overlaps with the orthographic projection of the first conductive part on the substrate, while the orthographic projection of the second sub-part on the substrate does not overlap with the orthographic projection of the first conductive part on the substrate.

[0015] In one exemplary embodiment of this disclosure, a first spacing is provided between the side of the reflective portion near the pixel defining structure and the corresponding side of the pixel defining structure near the reflective portion in a direction parallel to the substrate.

[0016] In a direction parallel to the substrate, a second spacing is provided between the side of the first conductive portion near the pixel defining structure and the corresponding side of the pixel defining structure near the first conductive portion;

[0017] The first spacing is 1-3 μm, and the second spacing is 1-3 μm.

[0018] In one exemplary embodiment of this disclosure, the light-emitting structure further includes:

[0019] A second conductive layer is disposed between the substrate and the reflective layer, and the second conductive layer includes a plurality of spaced-apart second conductive portions;

[0020] The orthogonal projection of the pixel region onto the substrate is located within the orthogonal projection of the second conductive portion onto the substrate;

[0021] The reflective portion and the second conductive portion correspond one-to-one in a direction perpendicular to the substrate, and the orthographic projections of the second conductive portion and the reflective portion on the substrate at least partially overlap.

[0022] In an exemplary embodiment of this disclosure, in a direction perpendicular to the substrate, the pixel defining structure has a bottom end near the substrate, a top end away from the substrate, and a middle portion located between the bottom end and the top end. The bottom end of the pixel defining structure defines a plurality of openings, and the middle or top portion of the pixel defining structure defines a plurality of light-emitting ports. Each opening exposes the second conductive portion.

[0023] The orthographic projection of the light outlet on the substrate is located within the orthographic projection of the opening on the substrate;

[0024] The light-emitting port, the reflective portion, and the first conductive portion at least partially overlap in their orthogonal projections onto the substrate.

[0025] In an exemplary embodiment of this disclosure, along a direction away from the substrate, the pixel defining structure includes a first part and a second part connected in sequence, wherein the orthographic projection of the first part on the substrate is located within the orthographic projection of the second part on the substrate, and the area of ​​the orthographic projection of the first part on the substrate is smaller than the area of ​​the orthographic projection of the second part on the substrate.

[0026] In an exemplary embodiment of this disclosure, the overlapping area of ​​the orthographic projections of the first conductive portion and the reflective portion on the substrate does not overlap with the orthographic projection of the second portion on the substrate.

[0027] At least a portion of the orthographic projection of the first or second spacing onto the substrate lies within the orthographic projection of the second portion onto the substrate.

[0028] In one exemplary embodiment of this disclosure, the height of the first portion is not less than the sum of the thicknesses of the reflective portion and the first conductive portion in a direction perpendicular to the substrate.

[0029] In one exemplary embodiment of this disclosure, in a direction perpendicular to the substrate, the side of the cross-section of the second portion away from the substrate is an arc shape that convexes in a direction away from the substrate.

[0030] In one exemplary embodiment of this disclosure, the cross-section of the pixel defining structure is mushroom-shaped in a direction perpendicular to the substrate.

[0031] In one exemplary embodiment of this disclosure, the reflective portion has a first surface close to the substrate, a second surface away from the substrate, and a sidewall located between the first surface and the second surface, and the first conductive portion contacts the sidewall and the second surface of the reflective portion.

[0032] In one exemplary embodiment of this disclosure, the light-emitting structure further includes:

[0033] A first insulating layer is disposed between the reflective layer and the first conductive layer. The first insulating layer includes a plurality of spaced-apart first insulating portions located within the pixel region. The orthographic projection of the reflective portion onto the substrate is located within the orthographic projection of the first insulating portion onto the substrate.

[0034] In one exemplary embodiment of this disclosure, the first insulating portion contacts the sidewall of the reflective portion and the side surface away from the substrate, and the first insulating portion contacts the area of ​​the second conductive portion exposed by the reflective portion.

[0035] In one exemplary embodiment of this disclosure, the light-emitting structure further includes:

[0036] A second insulating layer is disposed on the side of the second conductive layer away from the substrate. The second insulating layer includes a plurality of spaced second insulating portions located in the pixel region. The second insulating portions contact the area of ​​the second conductive portion exposed by the reflective portion, and the second insulating portions contact the sidewalls of the first conductive portion and the reflective portion, and contact at least a portion of the surface of the first conductive portion away from the substrate.

[0037] In one exemplary embodiment of this disclosure, the thickness of the second conductive layer is 8-18 nm, the thickness of the reflective layer is 60-150 nm, and the thickness of the first conductive layer is 8-18 nm.

[0038] The height of the pixel-defining structure is 1.2-2 μm in a direction perpendicular to the substrate.

[0039] In one exemplary embodiment of this disclosure, the display panel further includes:

[0040] A planarization layer is disposed on the side of the light-emitting structure close to the substrate.

[0041] The first conductive portion is connected to the pixel circuit through a via in the planarization layer, and the orthographic projection of the via on the substrate at least partially overlaps with the orthographic projection of the pixel defining structure on the substrate.

[0042] In one exemplary embodiment of this disclosure, the first insulating portion includes:

[0043] The third sub-part is located on the side of the reflective part away from the substrate.

[0044] The fourth sub-part is in contact with the second conductive part;

[0045] The fifth sub-part is connected between the third sub-part and the fourth sub-part, and the extending direction of the fifth sub-part forms an angle with the substrate, the angle being an acute angle.

[0046] In one exemplary embodiment of this disclosure, the display panel further includes:

[0047] A planarization layer is disposed on the side of the light-emitting structure close to the substrate.

[0048] The orthographic projection of the first conductive portion on the substrate at least partially overlaps with the orthographic projection of the pixel defining structure on the substrate.

[0049] The first conductive portion is in contact with at least a portion of the planarization layer.

[0050] In one exemplary embodiment of this disclosure, the display panel further includes:

[0051] A first insulating layer is located between the reflective layer and the second conductive layer. The first insulating layer includes a plurality of spaced-apart first insulating portions, and the first insulating portions at least partially cover the portions of the second conductive portions exposed by the reflective portions.

[0052] According to a second aspect of this disclosure, a method for manufacturing a display panel is provided, comprising:

[0053] Provide substrates;

[0054] A light-emitting structure is formed on one side of the substrate;

[0055] The formation of a light-emitting structure on one side of the substrate includes:

[0056] A reflective layer is formed on one side of the substrate, the reflective layer comprising a plurality of spaced reflective portions;

[0057] A first conductive layer is formed on the side of the reflective layer away from the substrate, and the first conductive layer includes a plurality of spaced first conductive portions;

[0058] A pixel defining structure is formed on one side of the substrate, the pixel defining structure defining a plurality of pixel regions arranged in an array, and the reflective portion is located within the pixel region;

[0059] A hole injection layer is formed on the side of the first conductive layer away from the substrate. The hole injection layer includes a first sub-part and a second sub-part. The first sub-part is located in the middle portion of the pixel region, and the second sub-part is located in the edge portion of the pixel region. The distance between the middle portion of the pixel region and the pixel defining structure is not less than the distance between the edge portion of the pixel region and the pixel defining structure. In a direction perpendicular to the substrate, at least a portion of the second sub-part has a larger size than the first sub-part.

[0060] The reflective portion and the first conductive portion correspond one-to-one in a direction perpendicular to the substrate, and the orthographic projections of the first conductive portion and the reflective portion on the substrate at least partially overlap.

[0061] In a direction parallel to the substrate, a first gap is provided between the side of the reflective portion or the first conductive portion near the pixel defining structure and the side of the corresponding pixel defining structure near the reflective portion or the first conductive portion.

[0062] In one exemplary embodiment of this disclosure, forming a pixel-defining structure on one side of the substrate includes:

[0063] An embedded layer is formed on the side of the first conductive layer away from the substrate. The embedded layer includes a plurality of spaced embedded portions. The embedded portions cover the surface of the first conductive portion away from the substrate, and the embedded portions at least cover the sidewalls of the first conductive portion and the reflective portion.

[0064] The pixel-defining structure is formed, and the pixel-defining structure at least covers the top surface of the embedded portion and the sidewall of the embedded portion;

[0065] Remove the embedded layer.

[0066] In one exemplary embodiment of this disclosure, in a direction parallel to the substrate, the distance between the side of the embedded portion away from the reflective portion and the side of the reflective portion close to the embedded portion is equal to the first spacing.

[0067] According to a third aspect of this disclosure, a display device is provided, including a display panel as described in the first aspect.

[0068] The display panel disclosed herein includes a pixel-defining structure that defines multiple pixel regions. A reflective portion is located within the pixel regions defined by the pixel-defining structure, and the reflective portion or the first conductive portion has a spacing between itself and the pixel-defining structure in a direction parallel to the substrate. That is, the overlapping area of ​​the reflective portion and the first conductive portion corresponds to the middle region of the second conductive portion. This structure is beneficial for enhancing the luminous intensity corresponding to this middle region, thereby relatively reducing the impact of edge regions on display quality. Attached Figure Description

[0069] The above and other features and advantages of this disclosure will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0070] Figure 1 This is a schematic diagram of the display panel structure in an exemplary embodiment of this disclosure;

[0071] Figure 2 This is a schematic diagram of the display panel structure in another exemplary embodiment of this disclosure;

[0072] Figure 3 This is a schematic diagram of the display panel structure in yet another exemplary embodiment of this disclosure;

[0073] Figure 4 This is a schematic diagram of the display panel structure in yet another exemplary embodiment of this disclosure;

[0074] Figure 5 This is a schematic diagram of the display panel structure in yet another exemplary embodiment of this disclosure;

[0075] Figure 6 This is a schematic diagram of the display panel structure in yet another exemplary embodiment of this disclosure;

[0076] Figure 7 This is a schematic diagram of the display panel structure in yet another exemplary embodiment of this disclosure;

[0077] Figure 8 This is a schematic diagram of the display panel structure in yet another exemplary embodiment of this disclosure;

[0078] Figure 9 This is a schematic diagram of the display panel structure in yet another exemplary embodiment of this disclosure;

[0079] Figure 10 This is a schematic diagram of the driving circuit layer structure of the display panel in an exemplary embodiment of this disclosure;

[0080] Figure 11 This is a schematic diagram of the structure formed in step S241 of the exemplary embodiments of this disclosure;

[0081] Figure 12 This is a schematic diagram of the structure formed in step S242 of the exemplary embodiments of this disclosure;

[0082] Figure 13 This is a schematic diagram of the structure formed in step S243 of the exemplary embodiments of this disclosure;

[0083] Figure 14 yes Figure 3 SEM image of the middle part of the pixel area of ​​the display panel;

[0084] Figure 15 This is a pixel-defined structure SEM image in an exemplary embodiment of this disclosure;

[0085] Figure 16 yes Figure 2 SEM image of the display panel;

[0086] Figure 17 yes Figure 3 SEM image of the portion of the display panel near the pixel-limiting structure;

[0087] Figure 18 This is a cross-sectional SEM image of the connection between the light-emitting device and the pixel circuit in an exemplary embodiment of this disclosure;

[0088] Figure 19 This is a top-view SEM image of the anode connection via of the light-emitting device in an exemplary embodiment of this disclosure.

[0089] The annotations for the main components in the diagram are explained below:

[0090] 1-Substrate; 2-Driving circuit layer; 21-Active layer; 22-First gate insulating layer; 23-First gate metal layer; 24-Second gate insulating layer; 25-Second gate metal layer; 26-Interlayer dielectric layer; 27-Source / drain layer; PLN-Planing layer; BFL-Buffer layer; 3-Light-emitting structure; 31-Second conductive layer; 311-Second conductive portion; 32-Reflective layer; 321-Reflective portion; 33-First conductive layer; 331-First conductive portion; 34-First insulating layer; 341-First insulating portion; 3411-Third sub-part; 34 12-Fourth sub-section; 3413-Fifth sub-section; 35-Second insulating layer; 351-Second insulating part; 36-Light-emitting functional layer; 361-Hole injection layer; 3611-First sub-section; 3612-Second sub-section; 362-Hole transport layer; 363-Light-emitting material layer; 364-Electron transport layer; 37-Third conductive layer; 38-Pixel limiting structure; 381-First part; 382-Second part; 01-Opening; 02-Light emission port; 30-Light-emitting device; 301-Anode; 4-Embedded layer; 41-Embedded part; 5-Via. Detailed Implementation

[0091] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are set forth to give a full understanding of embodiments of this disclosure.

[0092] For clarity, the thickness of regions and layers may be exaggerated in the figures. The same reference numerals in the figures denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0093] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the main technical concept of this disclosure.

[0094] When a structure is "on" other structures, it may mean that the structure is integrally formed on other structures, or that the structure is "directly" set on other structures, or that the structure is "indirectly" set on other structures through another structure.

[0095] The terms “a,” “one,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and that other elements / components / etc. may exist in addition to those listed. The terms “first” and “second” are used only as markers and are not a limitation on the number of objects.

[0096] Among related technologies, inkjet printing technology is widely used in the production of OLED display panels due to its advantages such as high production efficiency and low material cost. Inkjet printing involves dropping ink droplets into pixel areas and then drying them to solidify the droplets and form a light-emitting functional layer. However, while this method is simple to manufacture, during the drying process, the evaporation rate at the edges is higher than that in the center. This causes an outward capillary flow within the inkjet droplet, carrying suspended particles to the edges and depositing them in rings. This results in a thicker edge than center layer, creating a "coffee ring effect," which interferes with the microcavity effect, causing color shifts and affecting the display quality of the OLED display panel.

[0097] like Figures 1 to 9 As shown, this disclosure provides a display panel, including a substrate 1 and a light-emitting structure 3 disposed on one side of the substrate 1. The light-emitting structure 3 includes a pixel defining structure 38, a reflective layer 32, a first conductive layer 33, and a hole injection layer 361. The pixel defining structure 38 is disposed on one side of the substrate 1 and defines a plurality of arrayed pixel regions; the reflective layer 32 is disposed on one side of the substrate 1 and includes a plurality of spaced-apart reflective portions 321 located within the pixel regions; the first conductive layer 33 is disposed on the side of the reflective layer 32 away from the substrate 1 and includes a plurality of spaced-apart first conductive portions 331. A hole injection layer 361 is disposed on the side of the first conductive layer 33 away from the substrate 1. The hole injection layer 361 includes a first sub-part 3611 and a second sub-part 3612. The first sub-part 3611 is located in the middle portion of the pixel region, and the second sub-part 3612 is located in the edge portion of the pixel region. The distance between the middle portion of the pixel region and the pixel defining structure 38 is not less than the distance between the edge portion of the pixel region and the pixel defining structure 38. In the direction perpendicular to the substrate 1, at least a portion of the size of the second sub-part 362 is larger than the size of the first sub-part 361. The reflective portion 321 and the first conductive portion 331 correspond one-to-one, and the orthographic projections of the first conductive portion 331 and the reflective portion 321 on the substrate 1 at least partially overlap. In the direction parallel to the substrate 1, a first gap L1 is provided between the side of the reflective portion 321 near the pixel defining structure 38 and the side of the corresponding pixel defining structure 38 near the reflective portion 321.

[0098] The display panel provided in this disclosure defines a plurality of pixel regions by a pixel defining structure 38. A reflective portion 321 is located within the pixel regions defined by the pixel defining structure 38, and the reflective portion 321 or the first conductive portion 331 has a spacing between it and the pixel defining structure 38 in a direction parallel to the substrate 1. That is, the overlapping area of ​​the reflective portion 321 and the first conductive portion 331 corresponds to the middle region of the light-emitting structure. This structure is beneficial for enhancing the light-emitting intensity corresponding to this middle region, thereby reducing the impact of the edge region on the display quality to a relatively large extent.

[0099] Furthermore, in this disclosure, since there is a gap between the reflective portion 321 or the first conductive portion 331 and the pixel defining structure 38, the edge region of the formed reflective portion 321 or the first conductive portion 331 can have a stepped shape. This structural design helps to improve the thickness and flatness at the edge of the film layer when other film layers are subsequently formed by inkjet printing, thereby helping to improve the impact of the coffee ring effect on display quality in related technologies.

[0100] The components of the display panel provided in this embodiment will now be described in detail with reference to the accompanying drawings:

[0101] like Figures 1 to 9 As shown, this disclosure provides a display panel, which may be an OLED (Organic Light-Emitting Diode) display panel or a QLED (Quantum Dot Light-Emitting Diodes) display panel. The display panel includes a substrate 1 and a light-emitting structure 3 disposed on one side of the substrate 1. The light-emitting structure 3 includes a pixel defining structure 38, a reflective layer 32, and a first conductive layer 33.

[0102] The substrate 1 can be an inorganic material substrate or an organic material substrate. For example, in one embodiment of this disclosure, the material of the substrate 1 can be a glass material such as soda-lime glass, quartz glass, or sapphire glass, or a metal material such as stainless steel, aluminum, or nickel. In another embodiment of this disclosure, the material of the substrate 1 can be polymethyl methacrylate (PMMA), polyvinyl alcohol (PVA), polyvinyl phenol (PVP), polyether sulfone (PES), polyimide, polyamide, polyacetal, polycarbonate (PC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or a combination thereof. The substrate 1 can also be a flexible substrate 1. For example, in one embodiment of this disclosure, the material of the substrate 1 can be polyimide (PI). The substrate 1 can also be a composite of multiple materials. For example, in one embodiment of this disclosure, the substrate 1 may include a bottom film, a pressure-sensitive adhesive layer, a first polyimide layer and a second polyimide layer stacked sequentially.

[0103] like Figure 1 As shown, the light-emitting structure 3 is disposed on one side of the substrate 1. The light-emitting structure 3 can be used to form a light-emitting device to complete the image display. The light-emitting structure 3 includes a pixel defining structure 38, a reflective layer 32, and a first conductive layer 33.

[0104] The pixel defining structure 38 is provided on one side of the substrate 1, and defines a plurality of pixel regions arranged in an array. The shape of the orthographic projection of the pixel region on the substrate 1 can be a polygon, a smooth curved closed shape, or other shapes, and this disclosure does not limit the specific shape.

[0105] A reflective layer 32 is disposed on one side of the substrate 1. The reflective layer 32 includes a plurality of spaced-apart reflective portions 321 located within a pixel region. The material of the reflective layer 32 may include a conductive material, such as a conductive metal material or an alloy material. In one embodiment, the material of the reflective layer 32 may include a metal material such as silver or aluminum.

[0106] The first conductive layer 33 is disposed on the side of the reflective layer 32 away from the substrate 1. The first conductive layer 33 includes a plurality of spaced-apart first conductive portions 331. The first conductive portions 331 and the reflective portions 321 correspond one-to-one in the direction perpendicular to the substrate 1, that is, one-to-one in the Y direction. The orthographic projections of the first conductive portions 331 and the reflective portions 321 on the substrate 1 at least partially overlap. Specifically, the orthographic projection of the reflective portion 321 on the substrate 1 may be located within the orthographic projection of the first conductive portion 331 on the substrate 1, or may completely overlap with the orthographic projection of the first conductive portion 331 on the substrate 1. In this disclosure, complete overlap means that they are substantially the same in shape, size, and position. For example, such as Figure 1 As shown, in some embodiments, the reflective portion 321 has a first surface near the substrate 1 and a second surface away from the substrate 1, and a sidewall located between the first surface and the second surface. The first conductive portion 331 contacts the second surface and the sidewall of the reflective portion 321, and the first conductive portion 331 extends to the bottom end of the pixel defining structure 38, i.e., one end near the substrate 1. In such embodiments, the orthographic projection of the reflective portion 321 on the substrate 1 may lie within the orthographic projection of the first conductive portion 331 on the substrate 1.

[0107] The first conductive layer 33 may be made of a transparent conductive material, such as ITO (indium tin oxide) or IZO (indium zinc oxide). The first conductive layer 33 may be a single layer or a multilayer structure. In one embodiment, the first conductive layer 33 is a single layer structure and is made of ITO material.

[0108] In this disclosure, the reflective portion 321 is located within the pixel area, and the reflective portion 321 and the first conductive portion 331 at least partially overlap. This structure, through the reflective portion 321, helps to improve the reflectivity of the light emitted by the light-emitting device and enhance the luminous intensity of the light-emitting device.

[0109] like Figure 2As shown, in some embodiments of this disclosure, the light-emitting structure 3 further includes a second conductive layer 31. The second conductive layer 31 is disposed between the substrate 1 and the reflective layer 32, and includes a plurality of spaced-apart second conductive portions 311. The plurality of second conductive portions 311 are arranged in an array. The second conductive layer 31 may be made of a transparent conductive material, such as ITO (indium tin oxide), IZO (indium zinc oxide), etc. The orthographic projection of the second conductive portion 311 onto the substrate 1 may be circular, elliptical, regular polygonal, or irregular curved or polygonal, etc., and this disclosure does not limit the specific shape. The second conductive layer 31 may be a single-layer or multi-layer structure. In one embodiment, the second conductive layer 31 is a single-layer structure made of ITO material.

[0110] It should be noted that when the light-emitting structure also includes a second conductive layer 31, the first conductive portion 331 may not extend to the bottom end of the pixel defining structure 38; it may only contact the second surface of the reflective portion 321 away from the substrate 1, and the corner where the second surface of the reflective portion 321 meets the sidewall. Figure 16 As shown, in the actual process, when the first conductive layer 33 is formed, the first conductive part 331 may include a sub-conductive part 3311 that is in contact with the second surface of the reflective part 321 and a sub-conductive part 3312 that is not in contact with the second surface of the reflective part 321. The extending direction of the sub-conductive part 3312 has an angle with the second conductive part 311, and the angle is an acute angle.

[0111] A pixel defining structure 38 is provided on one side of the substrate 1, defining a plurality of pixel regions arranged in an array. Each pixel region exposes a corresponding second conductive portion 311. The orthographic projection of the pixel region onto the substrate 1 lies within the orthographic projection of the second conductive portion 311 onto the substrate 1. That is, the range of the pixel region lies within the boundary of its corresponding second conductive portion 311.

[0112] The reflective portion 321 and the second conductive portion 311 correspond one-to-one in the direction perpendicular to the substrate 1, that is, they correspond one-to-one in the Y direction. The orthographic projections of the second conductive portion 311 and the reflective portion 321 on the substrate 1 at least partially overlap.

[0113] In some embodiments, the orthographic projection of the reflective portion 321 on the substrate 1 is located within the orthographic projection of the second conductive portion 311 on the substrate 1, and the area of ​​the orthographic projection of the reflective portion 321 is smaller than the area of ​​the second conductive portion 311 exposed by the pixel region.

[0114] In this disclosure, such as Figure 1 , Figure 2As shown, in a direction parallel to the substrate 1, a gap is provided between the side of the reflective portion 321 or the first conductive portion 331 near the pixel defining structure 38 and the side of the corresponding pixel defining structure 38 near the reflective portion 321 or the first conductive portion 331. Specifically, a gap is provided between the reflective portion 321 and the pixel defining structure 38, or between the first conductive portion 331 and the pixel defining structure 38.

[0115] like Figure 1 , Figure 2 As shown, in some embodiments of this disclosure, a first spacing L1 is provided between the side of the reflective portion 321 near the pixel defining structure 38 and the side of the corresponding pixel defining structure 38 near the reflective portion 321 in a direction parallel to the substrate 1. Figure 2 As shown, when the display panel also includes a second conductive part 311, no reflective part 321 is provided above the area of ​​the second conductive part 311 corresponding to the first spacing L1.

[0116] Continue as Figure 1 , Figure 2 As shown, the size of the first spacing L1 in the X direction can be set according to the actual situation. For example, in some embodiments, the size of the first spacing L1 can be 1-3μm, specifically 1.1μm, 1.2μm, 1.3μm, 1.4μm, 1.5μm, 1.7μm, 1.9μm, 2μm, 2.1μm, 2.2μm, 2.3μm, 2.4μm, 2.5μm, 2.7μm, 2.9μm or 3μm, but is not limited to these.

[0117] In some embodiments, the orthographic projection of the first conductive portion 331 on the substrate 1 lies within the orthographic projection of the second conductive portion 311 on the substrate 1, and the area of ​​the orthographic projection of the first conductive portion 331 is smaller than the area of ​​the second conductive portion 311 exposed by the pixel region. In a direction parallel to the substrate 1, a second spacing L2 is provided between the side of the first conductive portion 331 near the pixel defining structure 38 and the side of the corresponding pixel defining structure 38 near the first conductive portion 331. Figure 2 As shown, when the display panel also includes a second conductive part 311, the first conductive part 331 is not provided above the area of ​​the second conductive part 311 corresponding to the second pitch L2.

[0118] like Figure 1 , Figure 2As shown, in the X direction, the area above the second conductive portion 311 corresponding to the second spacing L2 is not provided with a first conductive portion 331. The size of the second spacing can be set according to the actual situation. For example, in some embodiments, the size of the second spacing can be 1-3μm, specifically 1.1μm, 1.2μm, 1.3μm, 1.4μm, 1.5μm, 1.7μm, 1.9μm, 2μm, 2.1μm, 2.2μm, 2.3μm, 2.4μm, 2.5μm, 2.7μm, 2.9μm, or 3μm, but is not limited thereto. In some embodiments, the first spacing L1 is equal to the sum of the second spacing L2 and the thickness of the first conductive portion 331.

[0119] In this disclosure, the second conductive layer 31, the reflective layer 32, and the first conductive layer 33 are all film layers with a certain thickness. The thickness of the reflective layer 32 is not less than the thickness of the second conductive layer 31 and the first conductive layer 33. In one embodiment, the thickness of the second conductive layer 31 is 8-18 nm, specifically 8 nm, 10 nm, 12 nm, 13 nm, 15 nm, 16 nm, 17 nm, or 18 nm, but is not limited thereto. The thickness of the reflective layer 32 is 60-150 nm, specifically 60 nm, 65 nm, 70 nm, 75 nm, 80 nm, 85 nm, 90 nm, 95 nm, 100 nm, 105 nm, 115 nm, 120 nm, 125 nm, 130 nm, 135 nm, 140 nm, 145 nm, or 150 nm, but is not limited thereto. The thickness of the first conductive layer 33 is 8-18nm, specifically 8nm, 10nm, 12nm, 13nm, 15nm, 16nm, 17nm or 18nm, but is not limited to these.

[0120] In this disclosure, the light-emitting structure 3 includes multiple light-emitting devices, each located within a pixel region. The light-emitting devices can be OLEDs or QLEDs, etc.

[0121] In some embodiments, the first conductive portion 331 and the reflective portion 321 can serve as the anode of the light-emitting device; in other embodiments, the second conductive portion 311, the reflective portion 321 and the first conductive portion 331 can serve as the anode of the light-emitting device; in still other embodiments, the first conductive portion 331 can serve as the anode of the light-emitting device.

[0122] like Figures 1 to 9As shown, in some embodiments of this disclosure, the light-emitting structure 3 further includes a light-emitting functional layer 36 and a third conductive layer 37. The light-emitting functional layer 36 is disposed on the side of the first conductive layer 33 away from the substrate 1. In this disclosure, the light-emitting functional layer 36 can be formed by inkjet printing. The light-emitting functional layer 36 is a multilayer structure. Along the direction away from the substrate 1, the light-emitting functional layer 36 includes a hole injection layer 361, a hole transport layer 362, a light-emitting material layer 363, and an electron transport layer 364. Visible light can be generated by recombinating holes and electrons into excitons in the light-emitting material layer 363, and the excitons radiate photons. The specific light-emitting principle will not be detailed here. The light-emitting material layer 363 can be an organic light-emitting material layer or a quantum dot light-emitting material layer. The light-emitting functional layer 36 includes multiple light-emitting functional parts, which are located one-to-one in each pixel region. The thickness of the light-emitting functional layer 36 can be 200-500 nm, and the specific thickness can be set according to the actual situation. In some embodiments, the light-emitting functional layer 36 may further include an electron injection layer disposed on the side of the electron transport layer 364 away from the substrate 1.

[0123] In some embodiments of this disclosure, a hole injection layer 361 is disposed on the side of the first conductive layer 33 away from the substrate 1, and the hole injection layer 361 includes a first sub-part 3611 and a second sub-part 3612. For example... Figures 1 to 4 , Figure 5 , Figures 6 to 9 The first sub-part 3611 is located in the middle portion of the pixel region, and the second sub-part 3612 is located in the edge portion of the pixel region. The distance between the middle portion of the pixel region and the pixel defining structure 38 is not less than the distance between the edge portion of the pixel region and the pixel defining structure 38. Specifically, as shown... Figures 1 to 4 , Figures 6 to 9 As shown, the orthographic projection of the first sub-part 3611 on the substrate 1 overlaps with the orthographic projection of the reflective part 321 on the substrate 1, while the orthographic projection of the second sub-part 362 on the substrate 1 does not overlap with the orthographic projection of the reflective part 321 on the substrate 1, or as shown... Figure 5 As shown, the orthographic projection of the first sub-part 3611 on the substrate 1 overlaps with the orthographic projection of the first conductive part 331 on the substrate 1, while the orthographic projection of the second sub-part 3612 on the substrate 1 does not overlap with the orthographic projection of the first conductive part 331 on the substrate 1. In the direction perpendicular to the substrate 1, at least a portion of the size of the second sub-part 3612 is larger than the size of the first sub-part 3611.

[0124] The third conductive layer 37 is disposed on the side of the light-emitting functional layer 36 away from the substrate 1. The third conductive layer 37 can serve as the cathode of the light-emitting device. The third conductive layer 37 can be a single-layer or multi-layer structure, and its material can include one or more of conductive metals, metal oxides, and alloys.

[0125] Each light-emitting device can share the same cathode. Specifically, the third conductive layer 37 is a continuous conductive layer covering the light-emitting functional layer 36 and the pixel defining structure 38 of each light-emitting device. That is, the orthogonal projection of the third conductive layer 37 onto the substrate 1 covers each pixel area and the orthogonal projection of the pixel defining structure 38 onto the substrate 1. At the same time, the third conductive layer 37 is recessed into the pixel area at the location corresponding to the pixel area, that is, it is recessed in the direction close to the substrate 1 in the direction corresponding to the pixel area.

[0126] In this disclosure, in addition to improving the luminous intensity of the central region and reducing the impact of the edge region on the display quality to a certain extent through the above embodiments, the display quality of the display panel can be further improved through other means.

[0127] The following will describe in detail, with reference to different embodiments, methods for further improving the display quality of the display panel.

[0128] like Figure 1 As shown, in some embodiments of this disclosure, the reflective portion 321 and the first conductive portion 331 serve as the anode of the light-emitting device. Or as... Figure 2 As shown, in some embodiments of this disclosure, the second conductive part 311, the reflective part 321, and the first conductive part 331 serve as the anode of the light-emitting device.

[0129] like Figure 1 , Figure 2 As shown, the first conductive portion 331 contacts the sidewall of the reflective portion 321 and the surface away from the substrate 1. That is, the first conductive portion 331 encloses the reflective portion 321. In practical applications, the reflective portion 321 is typically a film layer of a certain thickness made of a metallic material. This film layer has high edge rigidity, which may cause damage to subsequent film layers, such as scratches or breakage. In this embodiment, the first conductive portion 331 enclosing the reflective portion 321 helps prevent breakage during the formation of subsequent film layers.

[0130] exist Figure 1 In this structure, the first conductive portion 331 can further extend to the bottom end of the pixel defining structure 38, and the first conductive portion 331 and the reflective portion 321 contact each other to form the anode of the light-emitting device. Figure 2 In this embodiment, the first conductive portion 331 may or may not extend to the bottom end of the pixel defining structure 38; this disclosure does not specify the specific extension. When the first conductive portion 331 does not extend to the bottom end of the pixel defining structure 38, a second spacing L2 exists between the first conductive portion 331 and the pixel defining structure 38. Figure 2 In the process, the first conductive part 331, the reflective part 321, and the second conductive part 311 are in contact with each other to form the anode of the light-emitting device.

[0131] In these embodiments, the emission of light from the edge portion of the light-emitting device within the pixel region can be limited by modifying the specific shape of the pixel defining structure 38. Specifically, this can be achieved by changing the dimensions of the pixel defining structure 38 in the direction parallel to the substrate 1. For example, in the direction perpendicular to the substrate 1, the pixel defining structure 38 has a bottom end near the substrate 1, a top end away from the substrate 1, and a middle portion located between the bottom end and the top end. The bottom end of the pixel defining structure 38 defines a plurality of openings 01. Figure 2 In this configuration, when the display panel also includes a second conductive portion 311, the opening 01 exposes a portion of the second conductive portion 311. A plurality of light-emitting ports 02 are defined at the center or top of the pixel-defining structure 38. The range of the light-emitting ports 02 is smaller than the range of the opening 01, meaning that the orthogonal projection of the light-emitting ports 02 onto the substrate 1 lies within the orthogonal projection of the opening 01 onto the substrate 1.

[0132] Furthermore, the orthographic projections of the light-emitting port 02, the reflective portion 321, and the first conductive portion 331 on the substrate 1 at least partially overlap. Preferably, the overlapping area of ​​the orthographic projections of the reflective portion 321 and the first conductive portion 331 on the substrate 1 completely overlaps with the orthographic projection of the light-emitting port 02 on the substrate 1. Alternatively, the orthographic projection of the light-emitting port 02 on the substrate 1 lies within the orthographic projections of the reflective portion 321 and the first conductive portion 331 on the substrate 1. In this way, the pixel defining structure 38 can block light that may be emitted from the area corresponding to the edge position of the second conductive portion 311, thereby preventing this part of the area from affecting the microcavity effect.

[0133] Continue as Figure 1 or Figure 2 As shown, the specific pattern of the pixel defining structure 38 can be set according to actual needs. In one specific embodiment, along the direction away from the substrate 1, the pixel defining structure 38 includes a first part 381 and a second part 382 connected in sequence. The orthographic projection of the first part 381 on the substrate 1 is located within the orthographic projection of the second part 382 on the substrate 1, and the area of ​​the orthographic projection of the first part 381 on the substrate 1 is smaller than the area of ​​the orthographic projection of the second part 382 on the substrate 1. In these embodiments, the second part 382 in the pixel defining structure 38 defines the range of the light exit port 02, and the end of the first part 381 near the substrate 1 defines the range of the opening 01.

[0134] The overlapping area of ​​the orthographic projections of the first conductive portion 331 and the reflective portion 321 on the substrate 1 does not overlap with the orthographic projection of the second portion 382 on the substrate 1; and at least a portion of the orthographic projection of the first spacing L1 or the second spacing L2 on the substrate 1 is located within the orthographic projection of the second portion 382 on the substrate 1. That is, the second portion 382 of the pixel limiting structure 38 blocks light that may be emitted from the area corresponding to the edge position of the second conductive portion 311.

[0135] In the direction perpendicular to the substrate 1, the height of the first portion 381 is not less than the sum of the thicknesses of the reflective portion 321 and the first conductive portion 331. That is, in the direction perpendicular to the substrate 1, the formed reflective portion 321 and the first conductive portion 331 are approximately located on the side of the second portion 382 closest to the substrate 1. Further, the height of the first portion 381 is greater than the sum of the thicknesses of the reflective portion 321 and the first conductive portion 331.

[0136] In one embodiment, in the direction perpendicular to the substrate 1, the cross-section of the first portion 381 is generally rectangular, but it can also be trapezoidal or an irregular polygon. In the direction perpendicular to the substrate 1, the side of the cross-section of the second portion 382 away from the substrate 1 is an arc shape convex in the direction away from the substrate 1. This arc shape helps to prevent breakage of subsequent film layers, such as the cathode layer. Further, in the direction perpendicular to the substrate 1, the cross-section of the pixel defining structure 38 is mushroom-shaped. In this disclosure, a mushroom shape is generally an open umbrella-shaped structure, with a generally cylindrical bottom and a generally approximately hemispherical top. In practical applications, the specific shape of the pixel defining structure 38 can be as follows... Figure 15 As shown, Figure 15 A scanning electron microscope (SEM) image of structure 38 with actual pixels defined.

[0137] In one embodiment, the height of the pixel defining structure 38 in the direction perpendicular to the substrate 1 is 1.2-2 μm. Specifically, it can be 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, 1.9 μm or 2 μm, but is not limited thereto.

[0138] like Figures 3 to 7 As shown, in some other embodiments of this disclosure, the first conductive portion 331 can serve as the anode of the light-emitting device. In these embodiments, there is a gap between the first conductive portion 331 and the pixel defining structure 38, and only the area corresponding to the first conductive portion 331 can emit light, while other edge areas do not emit light, thereby improving the impact of edge areas on the display image quality.

[0139] In some specific embodiments, the display panel further includes a first insulating layer 34.

[0140] like Figures 3 to 7As shown, in one embodiment, a first insulating layer 34 is disposed between a reflective layer 32 and a first conductive layer 33. The first insulating layer 34 includes a plurality of spaced-apart first insulating portions 341. The first conductive portion 331, the first insulating portion 341, the reflective portion 321, and the second conductive portion 311 correspond one-to-one in the direction perpendicular to the substrate 1, and each first insulating portion 341 is located one-to-one in each pixel region.

[0141] The first insulating portion 341 is located within the pixel area, and the orthographic projection of the reflective portion 321 on the substrate 1 lies within the orthographic projection of the first insulating portion 341 on the substrate 1. The thickness of the first insulating layer 34 is 30-100 nm, specifically 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 55 nm, 60 nm, 65 nm, 70 nm, 75 nm, 80 nm, 85 nm, 90 nm, 95 nm, or 100 nm, but is not limited to these. The material of the first insulating layer 34 includes inorganic materials, such as silicon nitride or silicon dioxide.

[0142] like Figure 3 and Figure 4 As shown, when there is a gap between the reflective portion 321 and the pixel defining structure 38, the first insulating portion 341 contacts the sidewall of the reflective portion 321 and the surface away from the substrate 1, and the first insulating portion 341 contacts the area of ​​the second conductive portion 311 exposed by the reflective portion 321. That is, the first insulating portion 341 insulates and isolates the second conductive portion 311, the reflective portion 321 and the first conductive portion 331, thereby making the first conductive portion 331 the anode of the light-emitting device. In this embodiment, the orthographic projection of the first conductive portion 331 on the substrate 1 can completely overlap with the orthographic projection of the reflective portion 321 on the substrate 1, that is, in the direction parallel to the substrate 1, the width of the first conductive portion 331 is approximately equal to the width of the reflective portion 321. Figure 5 As shown, when there is no gap between the reflective portion 321 and the pixel defining structure 38, the first insulating portion 341 contacts the side surface of the reflective portion 321 away from the substrate 1.

[0143] like Figure 6 and Figure 7 As shown, in another embodiment, the first insulating portion 341 does not contact the area of ​​the second conductive portion 311 exposed by the reflective portion 321, but only contacts the side surface of the reflective portion 321 away from the substrate 1. In this embodiment, the orthographic projections of the first conductive portion 331, the first insulating portion 341, and the reflective portion 321 on the substrate 1 completely overlap. That is, the shape, size, and position of the orthographic projections of the first conductive portion 331, the first insulating portion 341, and the reflective portion 321 on the substrate 1 are approximately the same.

[0144] In this embodiment, the display panel further includes a second insulating layer 35 disposed on the side of the second conductive layer 31 away from the substrate 1. The second insulating layer 35 includes a plurality of spaced-apart second insulating portions 351 located within the pixel region. The second insulating portions 351 contact the area of ​​the second conductive portion 311 exposed by the reflective portion 321, and also contact the sidewalls of the first conductive portion 331, the first insulating portion 341, and the reflective portion 321, and at least a portion of the surface of the first conductive portion 331 away from the substrate 1 to prevent oxidation of the reflective portion 321. In this embodiment, the area of ​​the second conductive portion 311 exposed by the reflective portion 321 is covered by the second insulating portion 351, and the reflective portion 321 is covered by the first insulating portion 341, thereby allowing the first conductive portion 331 to serve as the anode of the light-emitting device.

[0145] The thickness of the second insulating layer 35 is 10-20 nm, specifically 10 nm, 11 nm, 12 nm, 13 nm, 14 nm, 15 nm, 16 nm, 17 nm, 18 nm, 19 nm or 20 nm, but is not limited to these. The material of the second insulating layer 35 includes inorganic materials, such as silicon nitride or silicon dioxide.

[0146] The shape and size of the second insulating portion 351 can be set according to the first pitch L1 or the second pitch L2, etc. In one embodiment, the size of the second insulating portion 351 is approximately equal to the first pitch L1 in the direction parallel to the substrate 1. That is, in the X direction, the width of the second insulating portion 351 is approximately equal to the first pitch L1. In the direction perpendicular to the substrate 1, the height of the second insulating portion 351 is approximately the sum of the thicknesses of the first conductive portion 331, the first insulating portion 341, and the reflective portion 321. In one embodiment, the second insulating portion 351 may cover a portion of the sidewall of the pixel defining structure 38 near the reflective portion 321 or the first conductive portion 331. In the direction perpendicular to the substrate 1, the shape of the second insulating portion 351 is a groove.

[0147] It should be noted here that, as Figure 8 As shown, when the display panel also includes a second insulating layer 35, the display panel may not include a first insulating layer 34. In this case, the first conductive part 331, the reflective part 321 and part of the second conductive part 311 can serve as the anode of the light-emitting device.

[0148] Furthermore, this disclosure can also limit the light emission of the edge region of the light-emitting device by adjusting the positional relationship of each film layer, etc. Figure 9As shown, in some other embodiments of this disclosure, the first insulating layer 34 is located between the reflective layer 32 and the second conductive layer 31. The first insulating layer 34 includes a plurality of spaced-apart first insulating portions 341, which contact the portion of the second conductive portion 311 exposed by the reflective portion 321. In this embodiment, the first conductive portion 331 and the reflective portion 321 can serve as the anode of the light-emitting device.

[0149] When the display panel includes an insulating layer, such as a first insulating layer 34 or a second insulating layer 35, the specific shape of the pixel defining structure 38 is not particularly limited, and it can adopt a columnar, inverted trapezoidal, or other structures commonly used in the art. Figure 3 and Figure 6 As shown, in the direction perpendicular to the plane of the substrate 1, the cross-section of the pixel defining structure 38 is a cylindrical shape with a rounded top. Of course, as... Figure 4 and Figure 7 As shown, the shape of the pixel limiting structure 38 can also be the same as the mushroom-shaped pixel limiting structure 38 in the aforementioned embodiment, but this disclosure does not limit the specific shape.

[0150] In the above embodiments of this disclosure, due to the arrangement of the reflective portion 321 and the first conductive portion 331, the edge regions of the second conductive portion 311, the reflective portion 321, and the first conductive portion 331 of the light-emitting device are stepped. This structural design helps to improve the thickness and flatness of the film edge position when the light-emitting functional layer 36 is subsequently formed by inkjet printing, specifically as follows: Figure 14 As shown. Figure 14 Can correspond to Figure 3 or Figure 4 The example shown.

[0151] Figure 14 The image shows a SEM image of the various film layers formed at the edge of the light-emitting device, i.e., the side closest to the pixel-defining structure. As can be seen from the image, at edge location A, the thickness of each film layer is normal and the flatness is good, such as the hole injection layer 361, hole transport layer 362, light-emitting material layer 363, and electron transport layer 364. This helps to improve the impact of the coffee ring effect on display quality in related technologies.

[0152] Continue as Figure 14 As shown, in the actual process, the first insulating portion 341 includes a third sub-portion 3411, a fourth sub-portion 3412, and a fifth sub-portion 3413. The third sub-portion 3411 is located on the side of the reflective portion 321 away from the substrate 1; the fourth sub-portion 3412 is in contact with the second conductive portion 311; and the fifth sub-portion 3413 connects the third sub-portion 3411 and the fourth sub-portion 3412, with the extending direction of the fifth sub-portion 3413 forming an angle β with the substrate 1, where the angle β is acute.

[0153] It should be noted here that Figure 14 Only show as ±3 or Figure 4 The SEM image of the film structure in the middle part of the pixel region in the illustrated embodiment is shown. For the SEM image of the edge region, please refer to [reference needed]. Figure 17 As shown, in Figure 17 In the middle, the first conductive part 331 is not provided near the pixel limiting structure 38, that is, there is a gap between the first conductive part 331 and the pixel limiting structure 38.

[0154] like Figures 1 to 9 ,and Figure 10 As shown, in some embodiments of this disclosure, the display panel further includes a driving circuit layer 2, disposed between the substrate 1 and the light-emitting structure 3. The driving circuit layer 2 includes a driving circuit, which includes pixel circuits. The pixel circuits are used to drive the light-emitting devices 30 of the display panel to emit light. The pixel circuits can be 7T1C, 7T2C, 6T1C, or 6T2C, etc., and their structure is not specifically limited here. Wherein, nTmC indicates that a pixel circuit includes n transistors (represented by the letter "T") and m capacitors (represented by the letter "C"). The pixel circuits are connected one-to-one with the light-emitting devices 30 to drive the light-emitting devices 30 to emit light.

[0155] like Figure 10 As shown, in some embodiments of this disclosure, the driving circuit layer 2 may be composed of a multilayer film structure. Taking a top-gate thin-film transistor as an example, the driving circuit layer 2 includes an active layer 21, a first gate insulating layer 22, a first gate metal layer 23, a second gate insulating layer 24, a second gate metal layer 25, an interlayer dielectric layer 26, and a source / drain layer 27.

[0156] An active layer 21 is disposed on one side of the substrate 1; a first gate insulating layer 22 is disposed on the side of the active layer 21 away from the substrate 1, and the first gate insulating layer 22 covers the active layer 21; a first gate metal layer 23 is disposed on the side of the first gate insulating layer 22 away from the substrate 1, and the first gate metal layer 23 is used to form the first electrode plate of capacitor C and the gate of transistor T; a second gate insulating layer 24 is disposed on the side of the first gate metal layer 23 away from the substrate 1, and the second gate insulating layer 24 covers the first gate metal layer 23; the second gate metal layer... The second gate metal layer 25 is disposed on the side of the first gate insulating layer 22 away from the substrate 1 and is directly opposite to the first electrode plate. The second gate metal layer 25 is used to form the second electrode plate of the capacitor C. The interlayer dielectric layer 26 is disposed on the side of the second gate metal layer 25 away from the substrate 1 and covers the second gate metal layer 25. The source and drain layer 27 is disposed on the side of the interlayer dielectric layer 26 away from the substrate 1 and is used to form the source 27S and drain 27D of the transistor. The source 27S and drain 27D are connected to the active layer 21.

[0157] In some embodiments of this disclosure, the driving circuit layer 2 further includes a buffer layer BFL disposed between the active layer 21 and the substrate 1.

[0158] like Figure 1 , Figure 10 , Figure 18 and Figure 19 As shown, in some embodiments, the display panel further includes a planarization layer PLN. The planarization layer PLN is disposed on the side of the light-emitting structure 3 near the substrate 1, and the anode 301 of the light-emitting device 30 can be connected to the pixel circuit through vias in the planarization layer PLN to drive the light-emitting device 30 to emit light.

[0159] When the second conductive part 311, the reflective part 321, and the first conductive part 331 serve as the anode 301 of the light-emitting device 30, the light-emitting device 30 can be connected to the source / drain of the transistor in the pixel circuit through any one of the first conductive part 331, the reflective part 321, and the second conductive part 311 via a via. The actual connection method can be found in [reference needed]. Figure 18 As shown, in Figure 18 In the process, the light-emitting device is connected to the source / drain of the transistor in the pixel circuit through a via 5 via either the first conductive part 331, the reflective part 321, or the second conductive part 311.

[0160] When the first conductive part 331 serves as the anode 301 of the light-emitting device 30, the first conductive part 331 can be connected to the source / drain of the transistor in the pixel circuit through a via. When the first conductive part 331 and the reflective part 321 serve as the anode 301 of the light-emitting device 30, the first conductive part 331 or the reflective part 321 can be connected to the source / drain of the transistor in the pixel circuit through a via.

[0161] like Figure 1 and Figure 19 As shown, in some embodiments of this disclosure, the first conductive portion 331 is connected to the pixel circuit through a via 5 in the planarization layer PLN, and the orthographic projection of the via 5 on the substrate 1 at least partially overlaps with the orthographic projection of the pixel defining structure 38 on the substrate 1. Of course, in other embodiments, when the anode 301 of the light-emitting device 30 is connected to the pixel circuit through the second conductive portion 311 and through a via in the planarization layer PLN, the orthographic projection of the via on the substrate 1 and the orthographic projection of the pixel defining structure 38 on the substrate 1 may also at least partially overlap. In these embodiments, placing the via in the planarization layer PLN at the location of the pixel defining structure 38 helps to improve the aperture ratio of the display panel to some extent.

[0162] It should be noted that obtaining Figure 19In the SEM image shown, the microscope only had top light on and no bottom light on, resulting in high brightness due to reflection from the reflective part 321. Furthermore, some areas of the pixel-limiting structure 38 have light-blocking structures, while others do not. Therefore, different areas exhibit different brightness levels; areas with light-blocking structures are darker, while areas without are brighter.

[0163] like Figure 1 As shown, this disclosure also provides a method for manufacturing a display panel, including:

[0164] Step S100: Provide substrate 1;

[0165] Step S200: A light-emitting structure 3 is formed on one side of the substrate 1;

[0166] Step S200 includes:

[0167] Step S210: A reflective layer 32 is formed on one side of the substrate 1. The reflective layer 32 includes a plurality of spaced reflective portions 321.

[0168] In step S220, a first conductive layer 33 is formed on the side of the reflective layer 32 away from the substrate 1. The first conductive layer 33 includes a plurality of spaced first conductive portions 331.

[0169] In step S230, a pixel defining structure 38 is formed on one side of the substrate 1. The pixel defining structure 38 defines a plurality of pixel regions arranged in an array, and the reflective part 321 is located within the pixel region.

[0170] In step S240, a hole injection layer 361 is formed on the side of the first conductive layer 33 away from the substrate 1. The hole injection layer 361 includes a first sub-part 3611 and a second sub-part 3612. The first sub-part 3611 is located in the middle portion of the pixel region, and the second sub-part 3612 is located in the edge portion of the pixel region. The distance between the middle portion of the pixel region and the pixel defining structure 38 is not less than the distance between the edge portion of the pixel region and the pixel defining structure 38. In the direction perpendicular to the substrate 1, at least a portion of the size of the second sub-part 3612 is larger than the size of the first sub-part 3611.

[0171] Among them, the reflective part 321 and the first conductive part 331 correspond one-to-one, and the orthographic projections of the first conductive part 331 and the reflective part 321 on the substrate 1 at least partially overlap.

[0172] In a direction parallel to the substrate 1, a gap is provided between the side of the reflective portion 321 or the first conductive portion 331 near the pixel defining structure 38 and the side of the corresponding pixel defining structure 38 near the reflective portion 321 or the first conductive portion 331.

[0173] like Figures 11 to 13 As shown, in some embodiments, step S240 includes:

[0174] Step S241, as follows Figure 11 As shown, an embedded layer 4 is formed on the side of the first conductive layer 33 away from the substrate 1. The embedded layer 4 includes a plurality of spaced-apart embedded portions 41, which cover the surface of the first conductive portion 331 away from the substrate 1, and at least cover the sidewalls of the first conductive portion 331 and the reflective portion 321. The material of the embedded layer 4 may include a metallic material. In a direction parallel to the substrate 1, the distance between the side of the embedded portion 41 away from the reflective portion 321 and the side of the reflective portion 321 near the embedded portion 41 is equal to the first spacing L1; in a direction parallel to the substrate 1, the distance between the side of the embedded portion 41 away from the first conductive portion 331 and the side of the first conductive portion 331 near the embedded portion 41 is equal to the second spacing L2. The first spacing L1 may be the sum of the second spacing L2 and the thickness of the first conductive layer 33.

[0175] Step S242, as follows Figure 12 As shown, a pixel-defining structure 38 is formed, which at least covers the top surface of the embedded portion 41 and the sidewall of the embedded portion 41.

[0176] Step S243, as follows Figure 13 As shown, remove the embedded layer 4.

[0177] This disclosure also provides a display device, including a display panel. The display panel can be any of the display panels described in the above embodiments, and its specific structure and beneficial effects can be found in the above-described embodiments of the display panel, which will not be repeated here. The display device disclosed herein can be an electronic device such as a mobile phone, tablet computer, or television, which will not be listed individually here.

[0178] It should be noted that although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps, such as omitting certain steps, combining multiple steps into one step, and / or breaking down one step into multiple steps, should all be considered part of this disclosure.

[0179] It should be understood that this disclosure is not limited to the detailed structure and arrangement of the components presented in this specification. This disclosure is capable of other embodiments and can be implemented and performed in various ways. The foregoing variations and modifications fall within the scope of this disclosure. It should be understood that this disclosure, as disclosed and defined in this specification, extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or drawings. All these different combinations constitute multiple alternative aspects of this disclosure. The embodiments described in this specification illustrate the best known mode for implementing this disclosure and will enable those skilled in the art to utilize this disclosure.

Claims

1. A display panel, comprising a substrate and a light-emitting structure disposed on one side of the substrate, the light-emitting structure comprising: A pixel defining structure is disposed on one side of the substrate, the pixel defining structure defining a plurality of pixel regions arranged in an array; A reflective layer is disposed on one side of the substrate, the reflective layer comprising a plurality of spaced reflective portions located within the pixel region; A first conductive layer is disposed on the side of the reflective layer away from the substrate, and the first conductive layer includes a plurality of spaced first conductive portions; A hole injection layer is disposed on the side of the first conductive layer away from the substrate. The hole injection layer includes a first sub-part and a second sub-part. The first sub-part is located in the middle portion of the pixel region, and the second sub-part is located in the edge portion of the pixel region. The distance between the middle portion of the pixel region and the pixel defining structure is not less than the distance between the edge portion of the pixel region and the pixel defining structure. In a direction perpendicular to the substrate, at least a portion of the second sub-part has a larger size than the first sub-part. The reflective portion and the first conductive portion correspond one-to-one, and the orthographic projections of the first conductive portion and the reflective portion on the substrate at least partially overlap. In a direction parallel to the substrate, a gap is provided between the side of the reflective portion or the first conductive portion near the pixel defining structure and the side of the corresponding pixel defining structure near the reflective portion or the first conductive portion; Along a direction away from the substrate, the pixel defining structure includes a first part and a second part connected in sequence, wherein the orthographic projection of the first part on the substrate is located within the orthographic projection of the second part on the substrate, and the area of ​​the orthographic projection of the first part on the substrate is smaller than the area of ​​the orthographic projection of the second part on the substrate. In a direction perpendicular to the substrate, the side of the cross-section of the second part away from the substrate is an arc shape that bulges away from the substrate. The light-emitting structure further includes: A light-emitting material layer is located on the side of the first conductive layer that is away from the substrate. An electron transport layer is located on the side of the luminescent material layer that faces away from the substrate. The third conductive layer is located on the side of the electron transport layer that is away from the substrate. Wherein, at least a portion of the edge of the light-emitting material layer is located between the second part and the substrate, the electron transport layer includes two large surfaces opposite each other in its thickness direction, and a side surface connected between the two large surfaces, the side surface of the electron transport layer is in arcuate contact with the second part, and the third conductive layer partially covers the arcuate side of the second part away from the substrate, and partially covers the side of the electron transport layer away from the substrate.

2. The display panel of claim 1, wherein, The orthographic projection of the first sub-part on the substrate overlaps with the orthographic projection of the reflective part on the substrate, while the orthographic projection of the second sub-part on the substrate does not overlap with the orthographic projection of the reflective part on the substrate. Alternatively, the orthographic projection of the first sub-part on the substrate overlaps with the orthographic projection of the first conductive part on the substrate, while the orthographic projection of the second sub-part on the substrate does not overlap with the orthographic projection of the first conductive part on the substrate.

3. The display panel of claim 1, wherein, A first gap is provided between the side of the reflective portion near the pixel defining structure and the corresponding side of the pixel defining structure near the reflective portion in a direction parallel to the substrate. In a direction parallel to the substrate, a second spacing is provided between the side of the first conductive portion near the pixel defining structure and the corresponding side of the pixel defining structure near the first conductive portion; The first spacing is 1-3 μm, and the second spacing is 1-3 μm.

4. The display panel of claim 1, wherein, The light-emitting structure further includes: A second conductive layer is disposed between the substrate and the reflective layer, and the second conductive layer includes a plurality of spaced-apart second conductive portions; The orthogonal projection of the pixel region onto the substrate is located within the orthogonal projection of the second conductive portion onto the substrate; The reflective portion and the second conductive portion correspond one-to-one in a direction perpendicular to the substrate, and the orthographic projections of the second conductive portion and the reflective portion on the substrate at least partially overlap.

5. The display panel of claim 4, wherein, In a direction perpendicular to the substrate, the pixel defining structure has a bottom end near the substrate, a top end away from the substrate, and a middle portion located between the bottom end and the top end. The bottom end of the pixel defining structure defines a plurality of openings, and the middle or top portion of the pixel defining structure defines a plurality of light-emitting ports. Each opening exposes the second conductive portion. The orthographic projection of the light outlet on the substrate is located within the orthographic projection of the opening on the substrate; The light-emitting port, the reflective portion, and the first conductive portion at least partially overlap in their orthogonal projections onto the substrate.

6. The display panel of claim 3, wherein, The overlapping area of ​​the orthographic projections of the first conductive part and the reflective part on the substrate does not overlap with the orthographic projection of the second part on the substrate. At least a portion of the orthographic projection of the first or second spacing onto the substrate lies within the orthographic projection of the second portion onto the substrate.

7. The display panel of claim 1, wherein, In a direction perpendicular to the substrate, the height of the first part is not less than the sum of the thicknesses of the reflective part and the first conductive part.

8. The display panel of claim 1, wherein, In a direction perpendicular to the substrate, the cross-section of the pixel defining structure is mushroom-shaped.

9. The display panel of claim 1, wherein, The reflective portion has a first surface close to the substrate, a second surface away from the substrate, and a sidewall located between the first surface and the second surface, and the first conductive portion contacts the sidewall and the second surface of the reflective portion.

10. The display panel of claim 4, wherein, The light-emitting structure further includes: A first insulating layer is disposed between the reflective layer and the first conductive layer. The first insulating layer includes a plurality of spaced-apart first insulating portions located within the pixel region. The orthographic projection of the reflective portion onto the substrate is located within the orthographic projection of the first insulating portion onto the substrate.

11. The display panel of claim 10, wherein, The first insulating portion contacts the sidewall of the reflective portion and the side surface away from the substrate, and the first insulating portion contacts the area of ​​the second conductive portion exposed by the reflective portion.

12. The display panel of claim 4, wherein, The light-emitting structure further includes: A second insulating layer is disposed on the side of the second conductive layer away from the substrate. The second insulating layer includes a plurality of spaced second insulating portions located in the pixel region. The second insulating portions contact the area of ​​the second conductive portion exposed by the reflective portion, and the second insulating portions contact the sidewalls of the first conductive portion and the reflective portion, and contact at least a portion of the surface of the first conductive portion away from the substrate.

13. The display panel according to claim 4, wherein, The thickness of the second conductive layer is 8-18 nm, the thickness of the reflective layer is 60-150 nm, and the thickness of the first conductive layer is 8-18 nm. The height of the pixel-defining structure is 1.2-2 μm in a direction perpendicular to the substrate.

14. The display panel of claim 4, wherein, The display panel also includes: A planarization layer is disposed on the side of the light-emitting structure close to the substrate. The first conductive portion is connected to the pixel circuit through a via in the planarization layer, and the orthographic projection of the via on the substrate at least partially overlaps with the orthographic projection of the pixel defining structure on the substrate.

15. The display panel of claim 10, wherein, The first insulating part includes: The third sub-part is located on the side of the reflective part away from the substrate. The fourth sub-part is in contact with the second conductive part; The fifth sub-part is connected between the third sub-part and the fourth sub-part, and the extension direction of the fifth sub-part forms an angle with the substrate, the angle being an acute angle.

16. The display panel of claim 1, wherein, The display panel also includes: A planarization layer is disposed on the side of the light-emitting structure close to the substrate. The orthographic projection of the first conductive portion on the substrate at least partially overlaps with the orthographic projection of the pixel defining structure on the substrate. The first conductive portion is in contact with at least a portion of the planarization layer.

17. The display panel of claim 4, wherein, The display panel also includes: A first insulating layer is located between the reflective layer and the first conductive layer. The first insulating layer includes a plurality of spaced-apart first insulating portions, and the first insulating portions at least partially cover the portion of the second conductive portion exposed by the reflective portion.

18. A method for manufacturing a display panel, comprising: Provide substrates; A light-emitting structure is formed on one side of the substrate; The formation of a light-emitting structure on one side of the substrate includes: A reflective layer is formed on one side of the substrate, the reflective layer comprising a plurality of spaced reflective portions; A first conductive layer is formed on the side of the reflective layer away from the substrate, and the first conductive layer includes a plurality of spaced first conductive portions; A pixel defining structure is formed on one side of the substrate, the pixel defining structure defining a plurality of pixel regions arranged in an array, and the reflective portion is located within the pixel region; A hole injection layer is formed on the side of the first conductive layer away from the substrate. The hole injection layer includes a first sub-part and a second sub-part. The first sub-part is located in the middle portion of the pixel region, and the second sub-part is located in the edge portion of the pixel region. The distance between the middle portion of the pixel region and the pixel defining structure is not less than the distance between the edge portion of the pixel region and the pixel defining structure. In a direction perpendicular to the substrate, at least a portion of the second sub-part has a larger size than the first sub-part. The reflective portion and the first conductive portion correspond one-to-one, and the orthographic projections of the first conductive portion and the reflective portion on the substrate at least partially overlap. In a direction parallel to the substrate, a first gap is provided between the side of the reflective portion or the first conductive portion near the pixel defining structure and the side of the corresponding pixel defining structure near the reflective portion or the first conductive portion; Forming a pixel-defining structure on one side of the substrate includes: An embedded layer is formed on the side of the first conductive layer away from the substrate. The embedded layer includes a plurality of spaced embedded portions. The embedded portions cover the surface of the first conductive portion away from the substrate, and the embedded portions at least cover the sidewalls of the first conductive portion and the reflective portion. The pixel-defining structure is formed, and the pixel-defining structure at least covers the top surface of the embedded portion and the sidewall of the embedded portion; Remove the embedded layer so that, along the direction away from the substrate, the pixel defining structure includes a first part and a second part connected in sequence, wherein the orthographic projection of the first part on the substrate is located within the orthographic projection of the second part on the substrate, and the area of ​​the orthographic projection of the first part on the substrate is smaller than the area of ​​the orthographic projection of the second part on the substrate. In a direction perpendicular to the substrate, the side of the cross-section of the second part away from the substrate is an arc shape that bulges away from the substrate. The light-emitting structure further includes: A light-emitting material layer is located on the side of the first conductive layer that is away from the substrate. An electron transport layer is located on the side of the luminescent material layer that faces away from the substrate. The third conductive layer is located on the side of the electron transport layer that is away from the substrate. Wherein, at least a portion of the edge of the light-emitting material layer is located between the second part and the substrate, the electron transport layer includes two large surfaces opposite each other in its thickness direction, and a side surface connected between the two large surfaces, the side surface of the electron transport layer is in arcuate contact with the second part, and the third conductive layer partially covers the arcuate side of the second part away from the substrate, and partially covers the side of the electron transport layer away from the substrate.

19. The method of manufacturing a display panel according to claim 18, wherein, In a direction parallel to the substrate, the distance between the side of the embedded portion away from the reflective portion and the side of the reflective portion close to the embedded portion is equal to the first spacing.

20. A display device comprising a display panel as described in any one of claims 1-17.

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