Display substrate and display device

Abstract

A display substrate and a display device, the display device including a base substrate, a plurality of light-emitting elements located on the base substrate, and a pixel defining pattern. The light-emitting elements include a light-emitting functional layer, a first electrode, and a second electrode. The pixel defining pattern includes a plurality of openings and a defining portion surrounding the plurality of openings. The light-emitting elements are at least partially located within the openings. The light-emitting elements further include a light conversion layer, the light conversion layer being configured to emit light of another color after light of one color is incident on the light conversion layer. The light conversion layer is located on a side away from the base substrate of the second electrode, and at least a part of the light conversion layer is located within the opening. A surface of the portion of the light conversion layer located within the opening and close to the base substrate is closer to the base substrate than a surface of at least a part of the defining portion away from the base substrate. The display substrate provided by the embodiments of the present disclosure can reduce the distance between the light conversion layer and the light-emitting functional layer as much as possible, thereby improving the conversion efficiency of the incident light of the light conversion layer.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a display substrate and a display device.

Background Art

[0002] Organic light-emitting diode display panels have attracted wide attention due to their advantages such as thinning, flexibility, vivid colors, high contrast, and fast response speed, and are gradually replacing liquid crystal display panels. Quantum dot materials such as red quantum dot materials and green quantum dot materials can be installed in organic light-emitting diode display panels. By using quantum dot materials, a display device with good color purity can be realized.

Summary of the Invention

Means for Solving the Problems

[0003] Embodiments of the present disclosure provide a display substrate and a display device.

[0004] Embodiments of the present disclosure provide a display substrate including a base substrate, a plurality of light-emitting elements located on the base substrate, and a pixel definition pattern. The light-emitting element includes a light-emitting functional layer, and a first electrode and a second electrode located on both sides of the light-emitting functional layer along a direction perpendicular to the base substrate. The first electrode is located between the light-emitting functional layer and the base substrate. The pixel definition pattern is located on a side of the first electrode away from the base substrate. The pixel definition pattern includes a plurality of openings and a defining portion surrounding the plurality of openings. The light-emitting element is at least partially located within the opening. At least one light-emitting element further includes a light conversion layer configured to emit light of another color after light of one color is incident on the light conversion layer. The light conversion layer is located on a side of the second electrode away from the base substrate, and at least a part of the light conversion layer is located within the opening. A surface of the portion of the light conversion layer located within the opening close to the base substrate is closer to the base substrate than a surface of at least a part of the defining portion away from the base substrate.

[0005] For example, according to an embodiment of the present disclosure, a surface of a portion located within the opening of the light conversion layer that is away from the base substrate is closer to the base substrate than a surface of at least a part of the defining portion that is away from the base substrate.

[0006] For example, according to an embodiment of the present disclosure, a central portion of a surface of a portion located within the opening of the light conversion layer that is away from the base substrate is closer to the base substrate than an edge portion.

[0007] For example, according to an embodiment of the present disclosure, the light conversion layer includes quantum dots.

[0008] For example, according to an embodiment of the present disclosure, the display substrate further includes a first insulating layer located between the light conversion layer and the second electrode. A surface of a portion located within the opening of the first insulating layer that is away from the base substrate is closer to the base substrate than a surface of at least a part of the defining portion that is away from the base substrate.

[0009] For example, according to an embodiment of the present disclosure, a thickness of the first insulating layer is smaller than a thickness of at least a part of the defining portion.

[0010] For example, according to an embodiment of the present disclosure, the first insulating layer includes at least two film layers, and a difference in thickness between different film layers is smaller than 1 micron.

[0011] For example, according to an embodiment of the present disclosure, the plurality of light-emitting elements include at least two-color light-emitting elements. A defining portion located between openings corresponding to adjacent light-emitting elements of different colors includes a first sub-defining portion, and a defining portion located between openings corresponding to adjacent light-emitting elements of the same color includes a second sub-defining portion. A maximum thickness of the first sub-defining portion is greater than a maximum thickness of the second sub-defining portion, and / or a side surface of the first sub-defining portion that is away from the base substrate includes a first slope, a side surface of the second sub-defining portion that is away from the base substrate includes a second slope, an included angle of the first slope is greater than an included angle of the second slope, and a portion of the second electrode covering the second sub-defining portion is continuously provided.

[0012] For example, according to an embodiment of the present disclosure, the display substrate further includes a signal transmission line located on a side of the first electrode facing the base substrate, and a transmission portion located on a side of the first electrode facing the base substrate and electrically connected to the signal transmission line. The display substrate includes a display area and a peripheral area surrounding the display area. The signal transmission line is located in the peripheral area, the transmission portion is located on a side closer to the display area of the outermost edge portion of the defined portion, and the second electrode is electrically connected to the transmission portion.

[0013] For example, according to an embodiment of the present disclosure, the emission colors of at least two adjacent light-emitting elements arranged along a first direction are the same, and the emission colors of at least two adjacent light-emitting elements arranged along a second direction are different. The first direction intersects the second direction. The defined portion includes a plurality of first sub-defined portions and a plurality of second sub-defined portions. At least one first sub-defined portion extends along the first direction, and a second sub-defined portion extending along the second direction is provided between two adjacent first sub-defined portions.

[0014] For example, according to an embodiment of the present disclosure, the display substrate further includes an electrode contact portion located on a side of the defined portion facing the base substrate, and along a direction perpendicular to the base substrate, the defined portion overlaps with the electrode contact portion. The defined portion includes an opening or a groove exposing the electrode contact portion, and the second electrode is electrically connected to the electrode contact portion through the opening or the groove.

[0015] For example, according to an embodiment of the present disclosure, the ratio of the maximum thickness of the defined portion between light-emitting elements with different emission colors to the maximum thickness of the defined portion between light-emitting elements with the same emission color is 0.8 to 1.

[0016] For example, according to an embodiment of the present disclosure, the extending direction of at least a part of the electrode contact portion is the same as the extending direction of at least a part of the defined portion.

[0017] For example, according to an embodiment of the present disclosure, the display substrate further includes a signal transmission line located on a side of the first electrode facing the base substrate. The display substrate includes a display area and a peripheral area surrounding the display area. The signal transmission line is located in the peripheral area, and the second electrode is electrically connected to the signal transmission line through the electrode contact portion.

[0018] For example, according to an embodiment of the present disclosure, the electrode contact portion includes at least one film layer installed in the same layer as the first electrode.

[0019] For example, according to an embodiment of the present disclosure, the electrode contact portion includes a multi-layer film layer, and the distance between the surface of the electrode contact portion on the side away from the base substrate and the base substrate is greater than the distance between the surface of the first electrode on the side away from the base substrate and the base substrate.

[0020] For example, according to an embodiment of the present disclosure, the electrode contact portion includes a film layer located on the side of the first electrode away from the base substrate.

[0021] For example, according to an embodiment of the present disclosure, the display substrate further includes a planarization layer located between the first electrode and the base substrate. The planarization layer includes a planarization layer convex portion, and the orthographic projection of the planarization layer convex portion on the base substrate and the orthographic projection of the electrode contact portion on the base substrate overlap such that the distance between the surface of the electrode contact portion on the side away from the base substrate and the base substrate is greater than the distance between the surface of the first electrode on the side away from the base substrate and the base substrate.

[0022] For example, according to an embodiment of the present disclosure, the display substrate further includes a planarization layer located between the first electrode and the base substrate. The planarization layer includes concave grooves, and along a direction perpendicular to the base substrate, the defined portion does not overlap with the concave grooves, and the first electrodes and the light-emitting functional layers of at least some of the light-emitting elements are located within the concave grooves, and at least a part of the surface of the light-emitting functional layer on the side away from the base substrate is closer to the base substrate than the surface of the electrode contact portion on the side away from the base substrate.

[0023] For example, according to an embodiment of the present disclosure, the display substrate further includes a transparent compensation structure located between the light conversion layer and the bottom of the concave groove.

[0024] For example, according to an embodiment of the present disclosure, the side walls of the concave grooves are installed obliquely, and the portion of the side walls away from the base substrate is farther from the center of the light-emitting region of the light-emitting elements installed within the concave grooves than the portion closer to the base substrate.

[0025] For example, according to an embodiment of the present disclosure, the defined portion includes the opening, the plurality of light-emitting elements include at least two different colors of light-emitting elements, and the opening is installed at at least the largest interval among the intervals between the light-emitting regions of adjacent different-color light-emitting elements and the intervals between adjacent same-color light-emitting elements.

[0026] For example, according to an embodiment of the present disclosure, the display substrate further includes a separation structure located between the second electrode and the defined portion. Along a direction perpendicular to the base substrate, the separation structure overlaps with the defined portion, and the materials of the separation structure and the defined portion are different. Along the arrangement direction of adjacent light-emitting elements, in the separation structure located between the adjacent light-emitting elements, the edge of the separation structure protrudes with respect to the edge of the defined portion to form a protruding portion.

[0027] For example, according to an embodiment of the present disclosure, the display substrate further includes spacers located on the surface of at least a part of the defined portion on the side away from the base substrate.

[0028] For example, according to an embodiment of the present disclosure, the defining part includes a first defining part and a second defining part which are stacked, the first defining part is located on the side closer to the base substrate of the second defining part, and the surface of the light conversion layer closer to the base substrate is closer to the base substrate than the surface of at least a part of the second defining part away from the base substrate.

[0029] For example, according to an embodiment of the present disclosure, the first defining part is in direct contact with the second defining part, or the display substrate further includes a first insulating layer located between the light conversion layer and the second electrode, and the first insulating layer is installed between the first defining part and the second defining part.

[0030] For example, according to an embodiment of the present disclosure, a cross-section cut by a plane where a center connection line of the light-emitting regions of two adjacent light-emitting elements located on both sides of the defining part is located is a defining part cross-section, the shape of the defining part cross-section includes a trapezoid or a stepped shape, and the plane is perpendicular to the base substrate.

[0031] For example, according to an embodiment of the present disclosure, a cross-section cut by a plane where a center connection line of the light-emitting regions of two adjacent light-emitting elements located on both sides of the defining part is located is a defining part cross-section, the size of the middle part of the defining part cross-section in the direction parallel to the base substrate is larger or smaller than the size of both side parts in the direction parallel to the base substrate, and the plane is perpendicular to the base substrate.

[0032] For example, according to an embodiment of the present disclosure, the defining part includes a structure of at least two layers stacked.

[0033] For example, according to an embodiment of the present disclosure, the light-emitting functional layer includes a thermally activated delayed fluorescence material.

[0034] For example, according to an embodiment of the present disclosure, the plurality of light-emitting elements include light-emitting elements of at least two colors, and the light-emitting functional layers of the light-emitting elements of at least two colors are all configured to emit light of a first color. At least one color of the light-emitting elements of at least two colors includes the light conversion layer, and the first color of light is converted into light of a second color after passing through the light conversion layer.

[0035] For example, according to an embodiment of the present disclosure, the display substrate further includes a second insulating layer located on a side of the light conversion layer away from the base substrate, and a color filter layer located on a side of the second insulating layer away from the light conversion layer.

[0036] For example, according to an embodiment of the present disclosure, the second insulating layer includes refractive particles.

[0037] In the display substrate provided by the embodiment of the present disclosure, by installing the surface of the light conversion layer close to the base substrate to be closer to the base substrate than the surface of at least a part of the defining portion away from the base substrate, the distance between the light conversion layer and the light-emitting functional layer can be reduced as much as possible, and the conversion efficiency of the light incident on the light conversion layer can be improved.

[0038] The embodiment of the present disclosure provides a display substrate, including a base substrate, a plurality of light-emitting elements and a pixel defining pattern located on the base substrate. The light-emitting element includes a light-emitting functional layer, a first electrode and a second electrode located on both sides of the light-emitting functional layer along a direction perpendicular to the base substrate. The first electrode is located between the light-emitting functional layer and the base substrate. The pixel defining pattern is located on a side of the first electrode away from the base substrate. The pixel defining pattern includes a plurality of openings and a defining portion surrounding the plurality of openings. The light-emitting element is at least partially located in the opening. At least one light-emitting element further includes a light conversion layer, and the light conversion layer is configured to emit light of another color after light of one color is incident on the light conversion layer. The light conversion layer is located on a side of the first electrode away from the second electrode.

[0039] In the display substrate provided by the embodiments of the present disclosure, by disposing the light conversion layer on the side away from the second electrode of the first electrode, the distance between the light conversion layer and the light emitting functional layer can be reduced as much as possible, and the conversion efficiency of the incident light of the light conversion layer can be improved.

[0040] The embodiments of the present disclosure provide a display device, which includes the display substrate described in any of the above embodiments and a counter substrate disposed opposite to the display substrate. The counter substrate is located on the display side of the display substrate.

[0041] For example, according to the embodiments of the present disclosure, the material layer disposed at a position directly opposite to the light conversion layer on the side of the counter substrate facing the display substrate includes the same material as the material of the light conversion layer.

[0042] To more clearly explain the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. Obviously, the drawings described below relate only to some embodiments of the present disclosure and do not limit the present disclosure.

Brief Description of the Drawings

[0043]

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DETAILED DESCRIPTION OF THE INVENTION

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only some of the embodiments of the present disclosure, not all of them. Based on the embodiments of the present disclosure described, all other embodiments that can be obtained by those skilled in the art without creative labor shall fall within the protection scope of the present disclosure.

[0045] Unless otherwise defined, technical terms or scientific terms used in the present disclosure have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs. The "first", "second", and similar terms used in the present disclosure do not indicate any order, number, or importance, but are only used to distinguish different components. Similar terms such as "including" or "comprising" refer to the fact that the elements or members described before the term include the elements or members listed after the term, and their equivalents, and do not exclude other elements or members.

[0046] Features such as "parallel", "perpendicular", and "identical" used in the embodiments of the present disclosure all include the features of "parallel", "perpendicular", "identical", etc. in a strict sense, and "substantially parallel", "substantially perpendicular", "substantially identical", etc. include certain errors, and considering the errors related to measurement and the measurement of specific quantities (for example, the limitations of the measurement system), it is shown that it is within the acceptable deviation range for a specific value determined by those skilled in the art. For example, "substantially" can indicate being within one or more standard deviations, or within 10% or 5% of the value. In the following content of the embodiments of the present disclosure, when the number of one component is not specifically specified, it means that the component may be one, may be a plurality, or may be understood to be at least one. "At least one" refers to one or more, and "a plurality" refers to at least two. "Same layer" in the embodiments of the present disclosure refers to the relationship between a plurality of film layers formed of the same material after the same step (for example, a one-step patterning process). Here, "same layer" does not necessarily mean that the thicknesses of the plurality of film layers are the same, or that the heights in the cross-sectional views of the plurality of film layers are the same.

[0047] Embodiments of the present disclosure provide a display substrate and a display device. The display device includes a base substrate, and a plurality of light-emitting elements and a pixel defining pattern located on the base substrate. The light-emitting element includes a light-emitting functional layer, and a first electrode and a second electrode located on both sides of the light-emitting functional layer along a direction perpendicular to the base substrate. The first electrode is located between the light-emitting functional layer and the base substrate. The pixel defining pattern is located on a side of the first electrode away from the base substrate. The pixel defining pattern includes a plurality of openings and a defining portion surrounding the plurality of openings. The light-emitting element is at least partially located within the opening. At least one light-emitting element further includes a light conversion layer. The light conversion layer is configured to emit light of another color after light of one color is incident on the light conversion layer. The light conversion layer is located on a side of the second electrode away from the base substrate, and at least a part of the light conversion layer is located within the opening. A surface of the portion of the light conversion layer located within the opening close to the base substrate is closer to the base substrate than a surface of at least a part of the defining portion away from the base substrate. In the display substrate provided by the embodiments of the present disclosure, by arranging the surface of the portion of the light conversion layer located within the opening close to the base substrate to be closer to the base substrate than the surface of at least a part of the defining portion away from the base substrate, the distance between the light conversion layer and the light-emitting functional layer can be reduced as much as possible, and the conversion efficiency of the incident light of the light conversion layer can be improved.

[0048] Hereinafter, with reference to the drawings, the display substrate and the display device provided by the embodiments of the present disclosure will be described.

[0049] FIG. 1A is a partial planar structure schematic diagram of a display substrate according to an example of an embodiment of the present disclosure, and FIG. 2 is a partial cross-sectional structure schematic diagram cut along AA' shown in FIG. 1A.

[0050] As shown in FIGS. 1A and 2, the display substrate includes a base substrate 100, a plurality of light-emitting elements 200 located on the base substrate 100, and a pixel defining pattern 300. The light-emitting element 200 includes a light-emitting functional layer 230, and a first electrode 210 and a second electrode 220 located on both sides of the light-emitting functional layer along a direction perpendicular to the base substrate 100. The first electrode 210 is located between the light-emitting functional layer 230 and the base substrate 100. The direction perpendicular to the base substrate 100 refers to the direction perpendicular to the main substrate surface of the base substrate 100 where the light-emitting element 200 is installed, which is the Z direction shown in FIG. 2.

[0051] As shown in FIGS. 1A and 2, the pixel defining pattern 300 is located on the side of the first electrode 210 away from the base substrate 100. The pixel defining pattern 300 includes a plurality of openings 310 and a defining portion 320 surrounding the plurality of openings 310. The light-emitting element 200 is at least partially located within the opening 310. For example, the defining portion 320 may be formed of a transparent material or a black material. The statement that the light-emitting element is at least partially located within the opening means that at least a part of each light-emitting element is located within the opening.

[0052] As shown in FIGS. 1A and 2, at least one light-emitting element 200 further includes a light conversion layer 240. The light conversion layer 240 is configured to emit light of another color after light of one color is incident on the light conversion layer 240. The light conversion layer 240 is located on the side of the second electrode 220 away from the base substrate 100, and at least a part of the light conversion layer 240 is located within the opening 310. The surface of the portion of the light conversion layer 240 located within the opening 310 that is closer to the base substrate 100 is closer to the base substrate 100 than the surface of at least a part of the defining portion 320 that is away from the base substrate 100.

[0053] In the display substrate provided by the embodiments of the present disclosure, by installing the surface of the light conversion layer closer to the base substrate to be closer to the base substrate than the surface of at least a part of the defining portion away from the base substrate, the distance between the light conversion layer and the light-emitting functional layer can be reduced as much as possible, and the conversion efficiency of the incident light of the light conversion layer can be improved.

[0054] In FIG. 1A, only the pixel defining pattern and the outline of the light-emitting element defined by the opening of the pixel defining pattern are schematically shown, but the film layer on the side away from the base substrate of the pixel defining pattern and the film layer in the light-emitting element are not specifically shown.

[0055] The surface away from the base substrate of the above-defined portion refers to the surface at the position farthest from the base substrate of the defined portion, and the surface may be a flat surface or an arc surface, and the surface does not include the side surface of the defined portion.

[0056] The light conversion layer in the display substrate provided by the present disclosure is not a film layer of the entire layer, and the light conversion layer is a film layer located in the opening of the pixel defining pattern. Of course, the embodiments of the present disclosure are not limited to this, and the light conversion layer may further include a portion located on the surface away from the base substrate of some defined portions (for example, the second sub-defined portion described later) in addition to the portion located in the opening. However, the light conversion layers of light-emitting elements of different colors are installed at intervals without contact.

[0057] For example, as shown in FIG. 2, the defined portion 320 may have an integrated structure in the direction perpendicular to the base substrate 100. For example, the defined portion 320 includes only a single-layer structure.

[0058] For example, the defined portion 320 includes a portion located between light-emitting elements 200 that emit light of the same color and a portion located between light-emitting elements 200 that emit light of different colors. At least a part of the defined portion 320 may refer to a portion located between light-emitting elements 200 that emit light of different colors, a portion located between light-emitting elements 200 that emit light of the same color, or the defined portion 320 at each position.

[0059] For example, as shown in FIG. 2, a plane parallel to the base substrate 100 passes through at least a part of the defining portion 320 and the light conversion layer 240. For example, the light conversion layer 240 and at least a part of the defining portion 320 are installed overlappingly in a direction parallel to the base substrate 100. For example, the orthographic projection of the light conversion layer 240 on a plane perpendicular to the base substrate 100 overlaps with the orthographic projection of at least a part of the defining portion 320 on the plane.

[0060] For example, the light emitting element 200 may be an organic light emitting diode. For example, the light emitting element 200 may be an organic light emitting element. For example, the light emitting element 200 may be an electroluminescence element. For example, the light emitting element 200 can correspond to a sub-pixel on a display substrate. For example, one sub-pixel includes one light emitting element, or one sub-pixel includes two or more light emitting elements.

[0061] For example, the light-emitting functional layer 230 includes a plurality of film layers. For example, the plurality of film layers can include film layers such as a hole injection layer (HIL), a hole transport layer (HTL), a light-emitting layer (EL), an electron transport layer (ETL), and an electron injection layer (EIL). For example, the light-emitting functional layer 230 can further include a hole barrier layer (HBL), an electron barrier layer (EBL), a microcavity adjustment layer, an exciton adjustment layer, or other functional film layers. For example, the hole injection layer and the hole transport layer are located between the light-emitting layer and the first electrode 210, and the electron transport layer and the electron injection layer are located between the light-emitting layer and the second electrode 220. For example, the hole barrier layer is located between the light-emitting layer and the second electrode 220. For example, the electron barrier layer is located between the light-emitting layer and the first electrode 210. For example, the light-emitting functional layer can further include a plurality of stacked devices. For example, the first stack includes a first light-emitting layer, the second stack includes a second light-emitting layer, and the first stack and the second stack can further include one or more of a hole injection layer (HIL), a hole transport layer (HTL), a light-emitting layer (EL), an electron transport layer (ETL), an electron injection layer (EIL), a hole barrier layer, an electron barrier layer, a microcavity adjustment layer, an exciton adjustment layer, or other functional film layers. A charge generation layer (CGL) can be included between the first stack and the second stack, and the charge generation layer (CGL) can include an n-doped charge generation layer (CGL) and / or a p-doped charge generation layer (CGL). Of course, in order to further improve the light-emitting efficiency, the light-emitting functional layer can further include three or more stacks.

[0062] For example, the plurality of light-emitting elements 200 includes some light-emitting elements 200 that emit light of the same color and some light-emitting elements 200 that emit light of different colors. The light-emitting elements 200 that emit light of the same color and the light-emitting elements 200 that emit light of different colors can share the second electrode 220 and the light-emitting functional layer 230. The light-emitting functional layer 230 may be a common layer, and the second electrode 220 may be a common layer.

[0063] For example, the light-emitting functional layer 230 of the light-emitting element 200 that emits light of different colors is configured to emit light of the same color. For example, the plurality of light-emitting elements 200 include a red light-emitting element 201 configured to emit red light, a green light-emitting element 202 configured to emit green light, and a blue light-emitting element 203 configured to emit blue light. For example, the light-emitting functional layers of the red light-emitting element 201, the green light-emitting element 202, and the blue light-emitting element 203 all emit light of the same color.

[0064] For example, the light-emitting functional layer 230 of each light-emitting element 200 can include a multi-layer light-emitting layer. For example, it can be a multi-layer light-emitting layer that emits blue light in the same wavelength range, or a multi-layer light-emitting layer that emits blue light in different wavelength ranges (for example, dark blue light and light blue light), or a multi-layer light-emitting layer that emits blue light and green light respectively.

[0065] For example, the light-emitting functional layer 230 can include three layers of blue light-emitting layers and one layer of green light-emitting layer, and the green light-emitting layer is located on the side away from the base substrate of the three layers of blue light-emitting layers. For example, an electron transport layer, a charge generation layer, and a hole transport layer can be sequentially stacked and installed between two adjacent layers of blue light-emitting layers. For example, an electron transport layer, a charge generation layer, and a hole transport layer can be sequentially stacked and installed between the blue light-emitting layer and the green light-emitting layer. For example, platinum (Pt) doping can be used for the green light-emitting layer. For example, the charge generation layer located between the electron transport layer and the hole transport layer can include an n-type charge generation layer and a p-type charge generation layer, and a functional layer can be added between the n-type charge generation layer and the p-type charge generation layer to adjust the carrier transmission efficiency.

[0066] In some examples, the light-emitting functional layer 230 includes a thermally activated delayed fluorescence (TADF) material, thereby improving the light-emitting efficiency of the light-emitting functional layer, reducing the number of stacked layers of the light-emitting layer, and reducing the power consumption.

[0067] For example, the thickness of the electron transport layer may be 1 to 10 nanometers, for example, 2 to 8 nanometers, and for example, 3 to 7 nanometers. For example, the thickness of the electron injection layer may be 5 to 30 nanometers, for example, 22 to 28 nanometers, for example, 25 to 27 nanometers, for example, 5 to 15 nanometers, and for example, 6 to 12 nanometers.

[0068] For example, the first electrode 210 may be an anode, and the second electrode 220 may be a cathode. For example, the cathode can be formed of a material having high conductivity and a low work function. For example, the cathode can be manufactured from a metal material. For example, the anode can be formed of a conductive material having a high work function.

[0069] For example, at least one of the first electrode 210 and the second electrode 220 can include a multilayer film layer. For example, the first electrode 210 can include a three-layer film layer, namely, a first electrode layer, a second electrode layer, and a third electrode layer. For example, the first electrode 210 includes a stack of tungsten oxide (WOX) and aluminum (Al). For example, the materials of the first electrode layer and the third electrode layer may include tungsten oxide (WOX), and the material of the second electrode layer may include aluminum (Al).

[0070] For example, the first electrode 210 includes a triple layer of indium tin oxide (ITO), silver (Ag), and indium tin oxide (ITO). For example, the first electrode 210 includes a double layer of indium tin oxide (ITO) and silver (Ag). For example, the first electrode 210 includes indium tin oxide (ITO), silver (Ag), and another metal oxide layer (e.g., WOX). For example, at least two of the double or triple layers included in the first electrode are connected via vias. For example, there is an insulating layer between the first sublayer and the second sublayer on the side of the first electrode close to the light-emitting layer, and the first sublayer and the second sublayer are connected via the via of the insulating layer, that is, the first electrode can include the first sublayer, the insulating layer, and the second sublayer. For example, the first electrode can include the first sublayer, the insulating layer, the second sublayer, and a third sublayer on the side of the second sublayer away from the insulating layer. For example, the first electrode includes the first sublayer, the second sublayer, and the third sublayer respectively in the direction from the side close to the light-emitting layer to the side away from the light-emitting layer, there is an insulating layer between the second sublayer and the third sublayer, and the second sublayer and the third sublayer are connected via the via of the insulating layer, that is, the first electrode can include the first sublayer, the second sublayer, the insulating layer, and the third sublayer.

[0071] For example, the second electrode 220 can include one or two film layers. For example, the second electrode 220 may include a magnesium-silver alloy. For example, the second electrode 220 can include a first electrode layer and a second electrode layer, and the first electrode layer is located on the side of the second electrode layer close to the light-emitting layer. For example, the second electrode 220 can include a stack of indium oxide (InOX) and silver (Ag) or a silver alloy. For example, the material of the first electrode layer may include indium oxide (InOX), and the material of the second electrode layer may include silver (Ag) or a silver alloy.

[0072] For example, the first electrode 210 is a reflective electrode, and the second electrode 220 is a light-transmitting electrode. For example, the light emitted from the light-emitting functional layer 230 can be emitted from the side of the second electrode 220 away from the first electrode 210 and pass through the light conversion layer 240 to be converted into light of another color.

[0073] For example, the defining portion 320 of the pixel defining pattern 300 is a structure that defines the opening 310. For example, the material of the defining portion 320 can include polyimide, acrylic, polyethylene terephthalate, or the like. For example, the defining portion 320 is installed to intersect so as to define the opening 310.

[0074] For example, the opening 310 of the pixel defining pattern 300 is configured to define the light emitting region of the light emitting element 200. For example, a plurality of light emitting elements 200 may be installed in a one-to-one correspondence with a plurality of openings 310. For example, the light emitting element 200 can include a portion located within the opening 310 and a portion overlapping the defining portion 320 in a direction perpendicular to the base substrate 100.

[0075] For example, at least a part of the light emitting element 200 is located within the opening 310. For example, the first electrode 210 of the light emitting element is located on the side closer to the base substrate 100 of the defining portion 320, and the opening 310 is configured to expose the first electrode 210, and the exposed first electrode 210 is at least partially in contact with the light emitting functional layer 230 within the light emitting element 200. For example, at least a part of the first electrode 210 is located between the defining portion 320 and the base substrate 01. For example, when the light emitting functional layer 230 is located within the opening 310 of the pixel defining pattern 300, the first electrode 210 and the second electrode 220 located on both sides of the light emitting functional layer 230 can drive the light emitting functional layer 230 within the opening 310 of the pixel defining pattern 300 to emit light. For example, the above-mentioned light emitting region may refer to the effective light emitting region of the light emitting element, and the shape of the light emitting region refers to a two-dimensional shape. For example, the shape of the light emitting region may be the same as the shape of the opening 310 of the pixel defining pattern 300. For example, the opening of the pixel defining pattern 300 may have a shape in which the size on the side closer to the base substrate is small and the size on the side away from the base substrate is large. For example, the shape of the light emitting region may be substantially the same as the size and shape of the side of the opening of the pixel defining pattern 300 closer to the base substrate.

[0076] For example, at least a part of the opening 310 defined by the defining portion 320 is used to define the light output region of the light conversion layer 240.

[0077] In some examples, as shown in FIGS. 1A and 2, the plurality of light-emitting elements 200 includes at least two-color light-emitting elements 200 such as, for example, the first light-emitting element 201 and the second light-emitting element 202. The light-emitting functional layers 230 of the at least two-color light-emitting elements 200 are all configured to emit light of a first color. At least one of the at least two-color light-emitting elements 200 includes a light conversion layer 240, and the first-color light is converted into second-color light after passing through the light conversion layer 240. For example, the wavelength of the first-color light is smaller than the wavelength of the second-color light.

[0078] For example, the areas of the light-emitting regions of the light-emitting elements of different colors are different. For example, the area of the light-emitting region of the blue light-emitting element may be larger than the areas of the light-emitting regions of at least one of the red light-emitting element and the green light-emitting element.

[0079] For example, one of the first light-emitting element 201 and the second light-emitting element 202 may be a blue light-emitting element, a green light-emitting element, or a red light-emitting element, and the other of the first light-emitting element 201 and the second light-emitting element 202 may be a green light-emitting element, a red light-emitting element, or a blue light-emitting element.

[0080] For example, the first-color light may be blue light, and the second-color light may be red light or green light.

[0081] For example, as shown in FIG. 2, at least two light-emitting elements 200 that emit light of different colors include a light conversion layer 240. For example, both the red light-emitting element and the green light-emitting element can include the light conversion layer 240. For example, one of the first light-emitting element 201 and the second light-emitting element 202 is a red light-emitting element, and the other is a green light-emitting element. For example, the light conversion layer 240 of the red light-emitting element converts blue light into red light, and the light conversion layer 240 of the green light-emitting element converts blue light into green light.

[0082] For example, as shown in FIG. 2, the third light-emitting element 203 is a blue light-emitting element, and the third light-emitting element 203 includes a light-transmitting functional layer 250 configured to transmit the light of the first color, for example, blue light, emitted from the light-emitting functional layer 230. For example, the light-transmitting functional layer 250 can include scattering particles or refractive particles in order to improve the light extraction efficiency.

[0083] For example, as shown in FIG. 2, the surface of the portion located within the aperture 310 of the light-transmitting functional layer 250 that is closer to the base substrate 100 is closer to the base substrate 100 than the surface of at least a part of the defining portion 320 that is away from the base substrate 100. For example, the orthographic projection of the light-transmitting functional layer 250 on a plane perpendicular to the base substrate 100 overlaps with the orthographic projection of at least a part of the defining portion 320 on this plane. For example, a plane parallel to the base substrate 100 passes through at least a part of the defining portion 320 and the light-transmitting functional layer 250.

[0084] In some examples, the light conversion layer 240 includes quantum dots. The embodiments of the present disclosure are not limited thereto, and the light conversion layer can further include a fluorescent material. For example, when the incident light of the first color is incident on the light conversion layer 240, the material of the light conversion layer 240 is excited by the incident light of the first color and emits light of other colors such as light of the second color.

[0085] In some examples, as shown in FIG. 2, the surface of the portion located within the aperture 310 of the light conversion layer 240 that is away from the base substrate 100 is closer to the base substrate 100 than the surface of at least a part of the defining portion 320 that is away from the base substrate 100. For example, the light conversion layer 240 may be completely located within the aperture 310 defined by at least the defining portion 320.

[0086] For example, as shown in FIG. 2, the surface of the portion located within the aperture 310 of the light-transmitting functional layer 250 that is away from the base substrate 100 is closer to the base substrate 100 than the surface of at least a part of the defining portion 320 that is away from the base substrate 100. For example, the light-transmitting functional layer 250 may be completely located within the aperture 310 defined by at least the defining portion 320.

[0087] For example, as shown in FIG. 2, the surface of the light conversion layer 240 closer to the base substrate 100 may be a flat surface. For example, the surface of the light transmission functional layer 250 closer to the base substrate 100 may be a flat surface. For example, the surfaces of the light conversion layer 240 closer to the base substrate 100 within the light emitting element 200 that emit different colors of light may be located on the same surface. For example, the surface of the light conversion layer 240 closer to the base substrate 100 and the surface of the light transmission functional layer 250 closer to the base substrate 100 may be located on the same surface.

[0088] In some examples, as shown in FIG. 2, the central portion of the surface of the portion located within the opening 310 of the light conversion layer 240 that is away from the base substrate 100 is closer to the base substrate 100 than the edge portion. For example, the surface of the portion located within the opening 310 of the light conversion layer 240 that is away from the base substrate is a concave surface, and the highest point at the edge position of the concave surface is closer to the base substrate 100 than the surface of the defining portion 320 that is away from the base substrate 100.

[0089] For example, as shown in FIG. 2, the central portion of the surface of the portion located within the opening 310 of the light transmission functional layer 250 that is away from the base substrate 100 is closer to the base substrate 100 than the edge portion. For example, the surface of the portion located within the opening 310 of the light transmission functional layer 250 that is away from the base substrate 100 may be a surface concave toward the base substrate 100.

[0090] Of course, the embodiments of the present disclosure are not limited thereto, and the surface of the portion located within the opening of the light conversion layer that is away from the base substrate may be farther from the base substrate than the surface of the defining portion that is away from the base substrate, or a part of the position of the surface of the portion located within the opening of the light conversion layer that is away from the base substrate may be flush with the surface of the defining portion that is away from the base substrate.

[0091] For example, as shown in FIG. 2, the light conversion layer 240 within each light-emitting element 200 is located within the opening corresponding to the light-emitting element 200. For example, the light conversion layers 240 of adjacent light-emitting elements 200 having different emission colors are partitioned from each other. For example, the distance between the light conversion layers 240 of adjacent light-emitting elements 200 having different emission colors is greater than the width of the defining portion 320. For example, the light-transmitting functional layer 250 and the light conversion layer 240 are partitioned from each other.

[0092] For example, as shown in FIG. 2, in the direction perpendicular to the base substrate 100, the minimum thicknesses of the light conversion layers 240 of the light-emitting elements 200 that emit light of different colors may be the same or different. For example, in the direction perpendicular to the base substrate 100, the minimum thickness of the light conversion layer 240 and the minimum thickness of the light-transmitting functional layer 250 may be the same or different.

[0093] In some examples, as shown in FIG. 2, the display substrate further includes a first insulating layer 400 located between the light conversion layer 240 and the second electrode 220, and the surface of the portion located within the opening 310 of the first insulating layer 400 that is away from the base substrate 100 is closer to the base substrate 100 than the surface of at least a part of the defining portion 320 that is away from the base substrate 100.

[0094] For example, the first insulating layer 400 may be a sealing layer for sealing the light-emitting functional layer of the light-emitting element and the second electrode. For example, the difference between the distance d1 between the surface of the sealing layer on the side away from the base substrate 100 and the base substrate 100, and the distance d2 between the surface of at least a part of the defining portion 320 on the side away from the base substrate 100 and the base substrate 100 is at least 5 microns. For example, the difference between the distance d1 and the distance d2 may be 5.5 microns. For example, the difference between the distance d1 and the distance d2 may be 6 microns. For example, the difference between the distance d1 and the distance d2 may be 6.5 microns. For example, the difference between the distance d1 and the distance d2 may be 7 microns. For example, the difference between the distance d1 and the distance d2 may be 7.5 microns. For example, the difference between the distance d1 and the distance d2 may be 8 microns. For example, the difference between the distance d1 and the distance d2 may be 8.5 microns. For example, the difference between the distance d1 and the distance d2 may be 9 microns. For example, the difference between the distance d1 and the distance d2 may be 9.5 microns. For example, the difference between the distance d1 and the distance d2 may be 10 microns.

[0095] For example, as shown in FIG. 2, the first insulating layer 400 covers the defining portion 320 and the opening 310, and the light conversion layer 240 is located on the first insulating layer 400 within the opening 310. For example, the surface of the portion of the first insulating layer 400 located within the opening 310 on the side away from the base substrate 100 is a flat surface.

[0096] For example, as shown in FIG. 2, only the second electrode 220 and the first insulating layer 400 are provided between the light conversion layer 240 and the light-emitting functional layer 230, thereby significantly reducing the distance between the light conversion layer and the light-emitting functional layer.

[0097] For example, the distance between the light conversion layer 240 and the light emitting functional layer 230 is less than 5 microns. For example, the distance between the light conversion layer 240 and the light emitting functional layer 230 is less than 4.8 microns. For example, the distance between the light conversion layer 240 and the light emitting functional layer 230 is less than 4.5 microns. For example, the distance between the light conversion layer 240 and the light emitting functional layer 230 is less than 4.2 microns. For example, the distance between the light conversion layer 240 and the light emitting functional layer 230 is less than 4 microns. For example, the distance between the light conversion layer 240 and the light emitting functional layer 230 is less than 3.7 microns. For example, the distance between the light conversion layer 240 and the light emitting functional layer 230 is less than 3.5 microns. For example, the distance between the light conversion layer 240 and the light emitting functional layer 230 is less than 3.3 microns. For example, the distance between the light conversion layer 240 and the light emitting functional layer 230 is less than 3 microns.

[0098] In some examples, as shown in FIG. 2, the thickness of the first insulating layer 400 is less than the thickness of at least a part of the defining portion 320. For example, the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 1 micron. For example, the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 1.5 microns. For example, the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 2 microns. For example, the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 2.5 microns. For example, the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 3 microns. For example, the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 4 microns. For example, the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 5 microns.

[0099] For example, as shown in FIG. 2, the total thickness of the light emitting functional layer 230, the second electrode 220, and the first insulating layer 400 is less than the thickness of the defining portion 320, whereby the light conversion layer 240 can be formed within the opening 310 defined by the defining portion 320.

[0100] In some examples, as shown in FIG. 2, the first insulating layer 400 includes at least two film layers, such as a film layer 410 and a film layer 420, and the difference in thickness between different film layers is less than 1 micron. For example, the difference in thickness between different film layers is less than 0.9 micron. For example, the difference in thickness between different film layers is less than 0.8 micron. For example, the difference in thickness between different film layers is less than 0.7 micron. For example, the difference in thickness between different film layers is less than 0.6 micron. For example, the difference in thickness between different film layers is less than 0.5 micron. For example, the difference in thickness between different film layers is less than 0.4 micron.

[0101] For example, the first insulating layer 400 can include at least two inorganic insulating layers. For example, each film layer included in the first insulating layer 400 can be an inorganic layer. For example, each film layer included in the first insulating layer 400 can contain silicon (Si).

[0102] When the first insulating layer is used as a sealing layer, by only providing a thin inorganic insulating layer, the depth of the opening can be maintained as much as possible to form a printed light conversion layer or the like in the opening. Of course, the embodiments of the present disclosure are not limited thereto, and the first insulating layer can further include an organic insulating layer.

[0103] For example, the cross-section of the defining portion 320 cut along a plane perpendicular to the base substrate 100 (for example, the XZ plane) can be trapezoidal, and the angle between the hypotenuse and the lower base of the trapezoid is small, for example, 45° or less, which is advantageous for increasing the ratio of the maximum opening defining the light-emitting functional layer to the maximum opening defining the light conversion layer.

[0104] FIG. 3 is a schematic partial cross-sectional structure diagram cut along the line BB' shown in FIG. 1A according to an example of an embodiment of the present disclosure, and FIG. 4A is a schematic partial cross-sectional structure diagram cut along the line CC' shown in FIG. 1A.

[0105] In some examples, as shown in FIGS. 1A to 4A, the plurality of light-emitting elements 200 includes at least two-color light-emitting elements 200 such as, for example, a first light-emitting element 201, a second light-emitting element 202, and a third light-emitting element 203. The defining portion 320 located between the openings 310 corresponding to adjacent light-emitting elements 200 of different colors includes a first sub-defining portion 321, and the defining portion 320 located between the openings 310 corresponding to adjacent and same-color light-emitting elements 200 includes a second sub-defining portion 322. The maximum thickness of the first sub-defining portion 321 is greater than the maximum thickness of the second sub-defining portion 322, and the portion of the second electrode 220 covering the second sub-defining portion 322 is continuously provided.

[0106] The portion of the second electrode 220 covering the second sub-defining portion 322 being continuously provided means that the second electrode 220 covering the surface of the second sub-defining portion 322 on the side away from the base substrate 100 and covering the side surface of the second sub-defining portion 322 has a continuous structure. For example, the portion of the second electrode 220 covering at least two light-emitting elements has a continuous structure.

[0107] For example, the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 1 micron. For example, the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is 2 microns. For example, the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 3 microns. For example, the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 4 microns. For example, the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 5 microns. For example, the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 6 microns. For example, the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 7 microns.

[0108] For example, as shown in FIGS. 1A to 4A, the defining portion 320 includes an annular defining portion 323 surrounding a plurality of light-emitting elements 200, and the maximum thickness of the annular defining portion 323 is greater than the maximum thickness of the second sub-defining portion 322, thereby defining the light conversion layer 240 within the opening 310 of the pixel defining pattern 300 and preventing the light conversion layer 240 from overflowing from the defining portion 320. For example, the maximum thickness of the annular defining portion 323 is the same as the maximum thickness of the first sub-defining portion 321, but is not limited thereto. The maximum thickness of the annular defining portion may be greater than the maximum thickness of the first sub-defining portion, or may be smaller than the maximum thickness of the first sub-defining portion.

[0109] For example, as shown in FIGS. 2 and 4A, the angle of inclination of the inclined surface included in the side surface of the first sub-defining portion 321 away from the base substrate 100 is equal to the angle of inclination of the inclined surface included in the side surface of the second sub-defining portion 322 away from the base substrate 100. Of course, the embodiments of the present disclosure are not limited thereto. The angle of inclination of the inclined surface included in the side surface of the first sub-defining portion away from the base substrate may be greater than the angle of inclination of the inclined surface included in the side surface of the second sub-defining portion away from the base substrate, thereby improving the continuity at the position where the second electrode covers the second sub-defining portion.

[0110] For example, as shown in FIG. 3, the light conversion layer 240 covers the surface on the side of the second sub-defining portion 322 away from the base substrate 100. For example, the light conversion layer 240 has a continuous structure in the second sub-defining portion 322. For example, the light conversion layer 240 includes a portion located between the openings defined by adjacent second sub-defining portions 322 and a portion covering the second sub-defining portion 322.

[0111] For example, as shown in FIG. 3, the surface of the light conversion layer 240 on the side away from the base substrate 100 is farther away from the base substrate 100 than the surface of the second sub-defining portion 322 on the side away from the base substrate 100. For example, the surface of the portion of the light conversion layer 240 located on the second sub-defining portion 322 away from the base substrate 100 is closer to the base substrate 100 than the surface of the first sub-defining portion 321 on the side away from the base substrate 100.

[0112] For example, as shown in FIG. 4A, when the maximum thickness of the second sub-defining portion 322 is smaller than the maximum thickness of the first sub-defining portion 321, the opening formed between the adjacent first sub-defining portions 321 defines the position of the light conversion layer 240 and is used to prevent the light conversion layer 240 from overflowing from the defining portion 320. At this time, the light conversion layer 240 may cover the second sub-defining portion 322. For example, the light conversion layers 240 of adjacent light-emitting elements 200 with the same color may have a continuous structure, and a first sub-defining portion 321 is installed between the light conversion layers 240 of adjacent light-emitting elements 200 with different colors, thereby realizing that they are installed at intervals.

[0113] In FIG. 2, it is schematically shown that the second electrode 220 covering a plurality of first sub-defining portions 321 is a continuously installed film layer. However, in an actual product, when forming an opening 310 for accommodating the light conversion layer 240 by setting a large thickness of the first sub-defining portion 321, the second electrode 220 is easily cut at the edge of the first sub-defining portion 321. As a result, the second electrode 220 covering the defining portion 320 between adjacent light-emitting elements 200 with different colors is a discontinuous film layer, which affects the display effect. In the display substrate provided by an example of the embodiment of the present disclosure, by installing the defining portion as sub-defining portions having at least two different thicknesses, the continuity of the second electrode at the position with a small thickness is ensured, and the display effect of the display substrate is improved.

[0114] FIG. 1B is a partial plan structure schematic diagram of a display substrate according to an example of the embodiment of the present disclosure, and FIG. 4B is a partial cross-sectional structure schematic diagram cut along C1C1' shown in FIG. 1B. The difference between the display substrate shown in FIG. 1B and the display substrate shown in FIG. 1A is that the shape of the opening of the pixel defining pattern is different, and the width of the second sub-defining portion is different.

[0115] For example, as shown in FIGS. 1B and 4B, the first sub-defining portion 321 and the second sub-defining portion 322 may have a structure formed integrally or a structure formed separately. For example, when the second sub-defining portion 322 includes only a portion with a small thickness, the first sub-defining portion 321 includes a portion having the same thickness as the second sub-defining portion 322 (for example, the portion below the dotted line) and a portion exceeding the second sub-defining portion 322 (for example, the portion above the dotted line). For example, at the position where the first sub-defining portion 321 and the second sub-defining portion 322 are connected, it may be an arc surface, and thus, the cross-section of the concave portion formed by the first sub-defining portion 321 and the second sub-defining portion 322 cut along the XZ plane may be U-shaped or V-shaped.

[0116] FIG. 5 is a schematic diagram of a partial cross-sectional structure cut along the DD' line shown in FIG. 1A according to another example of the embodiment of the present disclosure. The difference between the display substrate shown in FIG. 5 and the display substrate shown in FIG. 3 is that the side surface of the first sub-defining portion 321 away from the base substrate 100 includes a first inclined surface 3210, the side surface of the second sub-defining portion 322 away from the base substrate 100 includes a second inclined surface 3220, and the inclination angle α1 of the first inclined surface 3210 is larger than the inclination angle α1 of the second inclined surface 3220. The structures such as the base substrate, the first insulating layer, the light-emitting functional layer, and the first electrode in the display substrate shown in FIG. 5 can have the same characteristics as the structures such as the base substrate, the first insulating layer, the light-emitting functional layer, and the first electrode in the display substrate shown in FIG. 3, and detailed description thereof is omitted here.

[0117] The included angle of the first inclined surface formed on the surface of the first sub-defining portion away from the base substrate is the angle between the surface of the portion of the first sub-defining portion close to the base substrate and the plane parallel to the base substrate. The included angle of the second inclined surface formed on the surface of the second sub-defining portion away from the base substrate is the angle between the surface of the portion of the second sub-defining portion close to the base substrate and the plane parallel to the base substrate. The included angle of the first sub-defining portion may refer to the included angle between the straight line or curve formed by cutting the first inclined surface in the XZ plane and the contact position of the straight line with the first electrode, or the included angle between the intersection of the curve and the first electrode and the X direction. The included angle of the second sub-defining portion may refer to the included angle between the straight line or curve formed by cutting the second inclined surface in the YZ plane and the contact position of the straight line with the first electrode, or the included angle between the intersection of the curve and the first electrode and the Y direction, but is not limited thereto. For example, the included angle may refer to the included angle between the tangent line at the midpoint of the curve formed by cutting the inclined surface in the XZ plane (or YZ plane) and the X direction (or Y direction).

[0118] In the display substrate in the example shown in FIG. 5, by setting the included angle of the second sub-defining portion to be smaller than the included angle of the first sub-defining portion, the continuity of covering the second sub-defining portion is realized, and the display effect of the display substrate is improved.

[0119] For example, as shown in FIG. 5, the maximum thickness of the second sub-defining portion 322 is large, thereby realizing that the light conversion layers 240 of adjacent and same-color light-emitting elements 200 are installed at intervals. For example, the surface of the second sub-defining portion 322 away from the base substrate 100 is farther from the base substrate 100 than the surface of the light conversion layer 240 close to the base substrate 100. For example, the surface of the second sub-defining portion 322 away from the base substrate 100 may be farther from the base substrate 100 than the surface of the light conversion layer 240 away from the base substrate 100, may be flush with the surface of the light conversion layer 240 away from the base substrate 100, or may be closer to the base substrate 100 than the surface of the light conversion layer 240 away from the base substrate 100. The embodiments of the present disclosure do not limit this, and it can be installed according to the continuous situation of the second electrode.

[0120] In some examples, as shown in FIGS. 1A to 5, the emission colors of at least two adjacent light-emitting elements 200 arranged along a first direction are the same, the emission colors of at least two adjacent light-emitting elements 200 arranged along a second direction are different, and the first direction intersects the second direction. In FIGS. 1A to 5, it is schematically shown that the first direction is the Y direction and the second direction is the X direction, but it is not limited thereto, and the first direction and the second direction can be exchanged with each other. For example, the first direction is perpendicular to the second direction, but it is not limited thereto, and the included angle between the first direction and the second direction may be 70 to 110°, or 80 to 100°, or 85 to 95°. For example, one of the first direction and the second direction is a row direction and the other is a column direction.

[0121] In some examples, as shown in FIGS. 1A to 5, the defining portion 320 includes a plurality of first sub-defining portions 321 and a plurality of second sub-defining portions 322. At least one first sub-defining portion 321 extends along the first direction, and a second sub-defining portion 322 extending along the second direction is installed between two adjacent first sub-defining portions 321. For example, the second sub-defining portions 322 installed between two adjacent first sub-defining portions 321 are installed parallel to each other. For example, in FIG. 1A, it is schematically shown that the shape of the opening 310 defined by the defining portion 320 may be rectangular, but it is not limited thereto, and the shape of the opening 310 may be other shapes such as the elongated shape shown in FIG. 1B, or an oval shape, a circular shape, a trapezoidal shape, etc.

[0122] For example, the first sub-defining portion 321 and the second sub-defining portion 322 may be an integrally installed structure formed in the same process, or a structure formed step by step. For example, the annular defining portion 323 may be an integrally installed structure formed in the same process with the first sub-defining portion 321 and the second sub-defining portion 322, or a structure formed step by step.

[0123] In some examples, as shown in FIGS. 1A and 3, the display substrate further includes a signal transmission line 500 located on the side of the base substrate 100 facing the first electrode 210. The display substrate includes a display area 101 and a peripheral area 102 surrounding the display area 101, and the signal transmission line 500 is located in the peripheral area 102. For example, the signal transmission line 500 may be an annular wiring surrounding the display area 101.

[0124] In some examples, as shown in FIGS. 1A and 3, the display substrate further includes a transmission portion 510 located on the side of the base substrate 100 facing the first electrode 210 and electrically connected to the signal transmission line 500. The transmission portion 510 is located on the side closer to the display area 101 of the outermost edge portion of the defining portion 320, and the second electrode 220 is electrically connected to the transmission portion 510. For example, the outermost edge portion of the defining portion 320 may be an annular defining portion 323.

[0125] For example, as shown in FIGS. 1A and 3, the signal transmission line 500 is configured to transmit a VSS signal such as a negative voltage signal to the second electrode 220.

[0126] For example, as shown in FIGS. 1A and 3, the boundary of the second electrode 220 extends beyond the boundary of the light-emitting functional layer 230, and the portion of the second electrode 220 extending beyond the boundary of the light-emitting functional layer 230 is electrically connected to the transmission portion 510.

[0127] For example, as shown in FIGS. 1A and 3, an opening 3100 is provided between the annular defining portion 323 and the second sub-defining portion 322 that is closest to and spaced apart from it, and no light-emitting element is provided in the opening 3100.

[0128] For example, as shown in FIGS. 1A and 3, the second electrode 220 located within the opening 3100 is electrically connected to the transmission portion 510. For example, the transmission portion 510 is provided facing the opening 3100.

[0129] For example, as shown in FIGS. 1A and 3, some light-emitting functional layers 230 may or may not be disposed within the opening 3100. For example, within the opening 3100, at least a portion of the second electrode 220 does not overlap with the light-emitting functional layer 230. For example, the portion of the second electrode 220 within the opening 3100 that does not overlap with the light-emitting functional layer 230 is electrically connected to the transmission portion 510.

[0130] For example, as shown in FIGS. 1A and 3, an electrode connection portion 501 disposed in the same layer as the first electrode 210 may be disposed within the opening 3100, and the second electrode 220 may be electrically connected to the transmission portion 510 through the electrode connection portion 501. Of course, the embodiments of the present disclosure are not limited thereto, and an electrode connection portion disposed in the same layer as the first electrode 210 may not be disposed within the opening, and the second electrode is electrically connected to the transmission portion 510 through a via within the insulating layer.

[0131] In the embodiments of the present disclosure, the thickness of some of the defining portions located in the central region of the pixel defining pattern is set to be smaller than the thickness of the defining portions at the edges of the pixel defining pattern, and the transmission portion of the signal transmission line electrically connected to the second electrode is disposed closer to the side of the defining portion with a smaller thickness at least at a portion of the position of the defining portion at the edge, so as to realize the continuous installation of the second electrode disposed in at least a portion of the display area. At the same time, a good electrical connection effect of the second electrode can be realized by electrically connecting some of the continuously installed second electrodes to the transmission portion.

[0132] For example, the display substrate further includes a pixel circuit electrically connected to the light-emitting element to drive the light-emitting element to emit light, the display substrate further includes a data line electrically connected to the pixel circuit, the data line is located between the first electrode of the light-emitting element and the base substrate, and the signal transmission line may be disposed in the same layer as the data line.

[0133] For example, the transmission portion 510 may be disposed in the same layer as the signal transmission line 500, for example, the transmission portion 510 may be a part of the signal transmission line 500.

[0134] For example, the transmission unit 510 may be located between the film layer where the signal transmission line 500 is located and the film layer where the first electrode 210 of the light-emitting element 200 is located. For example, the transmission unit 510 may be installed in the same layer as at least a part of the first electrode 210. For example, the transmission unit 510 may be located between the film layer where the second electrode 220 of the light-emitting element 200 is located and the film layer where the first electrode 210 is located.

[0135] In FIGS. 2, 4A, and 5, the film layer between the first electrode 210 and the base substrate 100 is not shown, and in FIG. 3, only the transmission unit 510 and the insulating layer located between the transmission unit 510 and the first electrode 210 are shown, but other film layers between the first electrode 210 and the base substrate 100 are not shown.

[0136] FIG. 6 is a partial plan structure schematic diagram of a display substrate according to another example of an embodiment of the present disclosure, and FIG. 7 is a partial cross-sectional structure schematic diagram cut along the EE' line shown in FIG. 6. The difference between the display substrate in the example shown in FIG. 6 and the display substrate shown in FIG. 1A is that the structural features of the defining portion 320 are different. The base substrate 100, the light-emitting element 200, and the first insulating layer 400 included in the display substrate in the example shown in FIG. 6 can have the same features as the base substrate 100, the light-emitting element 200, and the first insulating layer 400 included in the display substrate in the example shown in FIG. 1A, and detailed description thereof is omitted here.

[0137] In some examples, as shown in FIGS. 6 and 7, the display substrate further includes an electrode contact portion 520. The electrode contact portion 520 is located on the side of the base substrate 100 facing the defining portion 320, and along the direction perpendicular to the base substrate 100, the defining portion 320 overlaps with the electrode contact portion 520. The defining portion 320 includes an opening or a groove 324 that exposes the electrode contact portion 520, and the second electrode 220 is electrically connected to the electrode contact portion 520 through the opening or the groove 324.

[0138] For example, the groove 324 or the opening contains a carbon element, and for example, the groove 324 or the opening can further contain an oxygen element or the like.

[0139] For example, the actual contact area between the second electrode 220 and the electrode contact portion 520 is smaller than the width of the trench 324 or smaller than the maximum size of the opening.

[0140] For example, the electrode contact portion 520 in the example shown in FIG. 6 can play the same role as the transmission portion 510 in the example shown in FIG. 1A, such as electrically connecting the second electrode 220 and the signal transmission wiring 500. The electrode contact portion 520 and the transmission portion 510 may have the same structural features or different structural features, and the embodiments of the present disclosure do not limit this. For example, the electrode contact portion may also be referred to as an auxiliary cathode.

[0141] In some examples, as shown in FIGS. 6 and 7, the extending direction of at least a part of the electrode contact portion 520 is the same as the extending direction of at least a part of the defining portion 320. For example, when the electrode contact portion 520 overlaps with the defining portion 320 extending along the first direction, the electrode contact portion 520 extends along the first direction. For example, when the electrode contact portion 520 overlaps with the defining portion 320 extending along the second direction, the electrode contact portion 520 extends along the second direction.

[0142] For example, at least a part of the electrode contact portion 520 overlaps with at least a part of the defining portion 320. For example, the defining portion 320 covers the edge of the electrode contact portion 520.

[0143] For example, the orthographic projection of the electrode contact portion 520 on the base substrate 100 surrounding at least one side of one opening is located within the orthographic projection of the defining portion 320 on the base substrate 100, and the non-uniformity due to the voltage drop at each position of the display substrate can be alleviated.

[0144] For example, as shown in FIGS. 6 and 7, the extending direction of the trench 324 in the defining portion 320 is the same as the extending direction of the defining portion 320, and the extending direction of the trench 324 is the same as the extending direction of the electrode contact portion 520 exposed thereby.

[0145] For example, as shown in FIG. 6, the defining part 320 includes a plurality of first sub-defining parts 321 extending along a first direction and arranged along a second direction, and a second sub-defining part 322 extending along the second direction and located between adjacent first sub-defining parts 321. The plurality of second sub-defining parts 322 installed between adjacent first sub-defining parts 321 are arranged along the first direction. For example, the second sub-defining parts 322 arranged along the second direction are located in a straight line.

[0146] For example, the grooving 324 installed on one first sub-defining part 321 may penetrate the first sub-defining part 321 along the first direction, or may be located only at some positions within the first sub-defining part 321 without penetrating the first sub-defining part 321. For example, one grooving 324 extending along the first direction may be installed on one first sub-defining part 321, or a plurality of groovings 324 may be installed. The plurality of groovings 324 may extend along the first direction and be arranged along the second direction as shown in FIG. 6, or may extend along the first direction and be arranged at intervals along the first direction.

[0147] For example, the grooving 324 installed on one second sub-defining part 322 may penetrate the second sub-defining part 322 along the second direction, or may be located only at some positions within the second sub-defining part 322 without penetrating the second sub-defining part 322. For example, one grooving 324 extending along the second direction may be installed on one second sub-defining part 322, or a plurality of groovings 324 may be installed. The plurality of groovings 324 may extend along the second direction and be arranged along the first direction as shown in FIG. 6, or may extend along the second direction and be arranged at intervals along the second direction. For example, one first sub-defining part 321 is installed between two adjacent second sub-defining parts 322 arranged along the second direction. The grooving 324 installed on the second sub-defining part 322 may penetrate the first sub-defining part 321, or may be located only within the second sub-defining part 322. For example, it does not penetrate the second sub-defining part 322, and for example, a gap is provided between it and the first sub-defining part 321.

[0148] For example, in FIG. 6, grooves 324 are provided in each of the first sub-defining portions 321 and each of the second sub-defining portions 322, and two grooves 324 are provided in each sub-defining portion, and it is schematically shown that no groove is provided in the annular defining portion 323. However, the embodiments of the present disclosure are not limited thereto. For example, in one example of the embodiments of the present disclosure, grooves are provided only in the first sub-defining portion, and no grooves are provided in the second sub-defining portion and the annular defining portion. For example, in one example of the embodiments of the present disclosure, grooves are provided only in the second sub-defining portion, and no grooves are provided in the first sub-defining portion and the annular defining portion. For example, in one example of the embodiments of the present disclosure, grooves are provided in the first sub-defining portion and the second sub-defining portion in a certain region, and no grooves are provided in the first sub-defining portion in other regions. For example, in one example of the embodiments of the present disclosure, grooves are provided in the first sub-defining portion in a certain region, and grooves are provided in the second sub-defining portion in other regions. For example, the grooves formed in the first sub-defining portion and the second sub-defining portion can form a connected lattice shape.

[0149] For example, the number of grooves provided in different first sub-defining portions may be the same or different. For example, the number of grooves provided in different second sub-defining portions may be the same or different. For example, the number of grooves provided in one first sub-defining portion may be the same as or different from the number of grooves provided in one second sub-defining portion.

[0150] For example, as shown in FIG. 7, only the second electrode 220 is provided in the groove 324. For example, a groove 324 is provided in the defining portion 230 formed by patterning. After the light-emitting functional layer 230 is formed, the groove 324 is filled with the light-emitting functional layer. Before forming the second electrode 220, at least a part of the light-emitting functional layer 230 in the groove 324 is removed by using a laser, so that the groove 324 exposes the electrode contact portion 520, and a part of the second electrode 220 is formed in the groove 324 and connected to the electrode contact portion 520.

[0151] In some examples, as shown in FIGS. 6 and 7, the display substrate further includes a signal transmission line 500 located on the side of the base substrate 100 facing the first electrode 210. The display substrate includes a display area and a peripheral area surrounding the display area (see the display area 101 and the peripheral area 102 shown in FIG. 1A), the signal transmission line 500 is located in the peripheral area, and the second electrode 220 is electrically connected to the signal transmission line 500 through the electrode contact portion 520.

[0152] For example, as shown in FIGS. 6 and 7, the electrode contact portion 520 extends to the peripheral area and is electrically connected to the signal transmission line 500. For example, the electrode contact portion 520 may be formed in a grid pattern.

[0153] For example, taking the first sub-defining portion 321 as an example as shown in FIGS. 6 and 7, two open grooves 324 are provided in each first sub-defining portion 321, and the two open grooves 324 divide each first sub-defining portion 321 into three parts. In the first sub-defining portion 321, the maximum thickness of the middle part is greater than the maximum thickness of the two parts located on both sides. For example, in the first sub-defining portion 321, the surface of the middle part facing away from the base substrate 100 is farther from the base substrate 100 than the surface of the light conversion layer 240 facing away from the base substrate 100, and the surface of at least one of the two parts located on both sides facing away from the base substrate 100 is closer to the base substrate 100 than the surface of the light conversion layer 240 facing away from the base substrate 100.

[0154] For example, as shown in FIGS. 6 and 7, the light conversion layer 240 covers at least one of the two portions located on both sides of the first sub-defining portion 321. For example, the maximum thicknesses of the two portions located on both sides of the first sub-defining portion 321 may be the same or different. For example, three portions having the same characteristics as the first sub-defining portion 321 may be provided in the second sub-defining portion 322. Of course, the embodiments of the present disclosure are not limited to the case where three portions shown in FIG. 7 are provided in each sub-defining portion. When the number of grooves is one, each sub-defining portion can include two portions, and the maximum thicknesses of the two portions may be the same or different. When the number of grooves is one, each sub-defining portion can include two portions, and at least one of the two portions may be provided as a stepped structure, and the maximum thickness of the portion located in the middle of the stepped structure is larger. When the number of grooves is three, each sub-defining portion can include four portions, and the maximum thickness of at least one portion located in the middle is larger than the maximum thickness of at least one portion located at the edge.

[0155] In the display substrate provided by the embodiments of the present disclosure, grooves are provided in the defining portions of the pixel defining pattern, and the second electrode of the light-emitting element is electrically connected to the electrode contact portion through the grooves, which is advantageous for improving the electrical connection effect between the second electrode and the electrode contact portion. Further, at least one sub-defining portion in the defining portion is provided in three portions, and the maximum thickness of the middle portion is made larger than the maximum thicknesses of the two portions on both sides, so that while filling the opening defined by the defining portion with the light conversion layer, it is advantageous to realize that the second electrode has good continuity.

[0156] In some examples, as shown in FIG. 7, the electrode contact portion 520 includes at least one film layer provided in the same layer as the first electrode 210. For example, the first electrode 210 can include multiple film layers, the electrode contact portion 520 can be a single film layer, and the electrode contact portion 520 can be formed in the same patterning process as a single film layer in the first electrode 210.

[0157] For example, as shown in FIG. 7, the electrode contact portion 520 is installed at a distance from and insulated from the first electrode 210.

[0158] FIG. 8A is a schematic cross-sectional structure diagram cut along the FF' line shown in FIG. 6, and FIG. 8B is a partially enlarged schematic diagram of the F1 region shown in FIG. 8A.

[0159] In some examples, as shown in FIGS. 6 to 8A, the ratio of the maximum thickness of the defining portion 320 between the light-emitting elements 200 with different emission colors to the maximum thickness of the defining portion 320 between the light-emitting elements 200 with the same emission color is 0.8 to 1. For example, the ratio of the maximum thickness of the defining portion 320 between the light-emitting elements 200 with different emission colors to the maximum thickness of the defining portion 320 between the light-emitting elements 200 with the same emission color is 0.85 to 0.88. For example, the ratio of the maximum thickness of the defining portion 320 between the light-emitting elements 200 with different emission colors to the maximum thickness of the defining portion 320 between the light-emitting elements 200 with the same emission color is 0.9 to 0.95. For example, the ratio of the maximum thickness of the defining portion 320 between the light-emitting elements 200 with different emission colors to the maximum thickness of the defining portion 320 between the light-emitting elements 200 with the same emission color is 0.92 to 0.97. For example, the maximum thickness of the defining portion 320 between the light-emitting elements 200 with different emission colors is the same as the maximum thickness of the defining portion 320 between the light-emitting elements 200 with the same emission color.

[0160] For example, as shown in FIGS. 6 to 8A, the defining portion 320 between the light-emitting elements 200 with different emission colors is the first sub-defining portion 321, the defining portion 320 between the light-emitting elements 200 with the same emission color is the second sub-defining portion 322, and the ratio of the maximum thickness of the first sub-defining portion 321 to the maximum thickness of the second sub-defining portion 322 is 0.8 to 1. For example, the ratio of the maximum thickness of the first sub-defining portion 321 to the maximum thickness of the second sub-defining portion 322 is 0.9 to 0.95. For example, the ratio of the maximum thickness of the first sub-defining portion 321 to the maximum thickness of the second sub-defining portion 322 is 0.92 to 0.97. For example, the maximum thickness of the first sub-defining portion 321 is the same as the maximum thickness of the second sub-defining portion 322.

[0161] In the display substrate provided by the embodiments of the present disclosure, the maximum thicknesses of the defining portions extending in the first direction and the defining portions extending in the second direction are substantially the same. At the same time, a trench exposing the electrode contact portion is provided in the defining portion, and the second electrode is electrically connected to the electrode contact portion through the trench, so that a good electrical connection effect can be achieved between the second electrode and the signal transmission line.

[0162] For example, as shown in FIG. 8B, the second electrodes 220 located on the intermediate defining portion 031 and the second electrodes 220 located on the both-side defining portions 032 have a cutting structure. A trench 324 is provided between the intermediate defining portion 031 and the both-side defining portions 032, and by removing the light-emitting functional layer 230 in the trench 324 before forming the second electrode 220, the second electrode 220 can be formed in the trench 324 and electrically connected to the electrode contact portion 520.

[0163] For example, similar to the example shown in FIG. 8B, in the defining portions shown in FIGS. 7 and 9 to 15, the second electrodes 220 located on the intermediate defining portion and the second electrodes 220 located on the both-side defining portions have a cutting structure. A trench 324 is provided between the intermediate defining portion and the both-side defining portions, and by removing the light-emitting functional layer 230 in the trench 324 before forming the second electrode 220, the second electrode 220 can be formed in the trench 324 and electrically connected to the electrode contact portion 520.

[0164] FIG. 9 is a partial cross-sectional structure schematic diagram cut along the EE' line shown in FIG. 6 according to another example of the embodiment of the present disclosure. The difference between the display substrate in the example shown in FIG. 9 and the display substrate in the example shown in FIG. 7 is that the structure of the electrode contact portion 520 is different. The structures such as the base substrate, the light-emitting element, the pixel defining pattern, and the first insulating layer in the display substrate in the example shown in FIG. 9 can have the same characteristics as the structures such as the base substrate, the light-emitting element, the pixel defining pattern, and the first insulating layer in the display substrate in the example shown in FIG. 7, and the detailed description is omitted here.

[0165] In some examples, as shown in FIG. 8A, the electrode contact portion 520 includes a multi-layer film layer, and the distance between the surface of the electrode contact portion 520 on the side away from the base substrate 100 and the base substrate 100 is greater than the distance between the surface of the first electrode 210 on the side away from the base substrate 100 and the base substrate 100. For example, the thickness of the electrode contact portion 520 is greater than the thickness of the first electrode 210.

[0166] In the display substrate provided by the embodiments of the present disclosure, by setting the thickness of the electrode contact portion to be greater than the thickness of the first electrode, it is easy for the second electrode to be electrically connected to the electrode contact portion through the open groove, which is advantageous for reducing the resistance of the second electrode.

[0167] In some examples, as shown in FIG. 8A, the electrode contact portion 520 includes a film layer located on the side of the first electrode 210 away from the base substrate 100. For example, the electrode contact portion 520 includes a film layer in the same layer as the first electrode 210 and a film layer located on the side of the first electrode 210 away from the base substrate 100. For example, the film layer installed in the same layer as the first electrode 210 of the electrode contact portion 520 can be formed in the same patterning process as the first electrode 210.

[0168] FIG. 10 is a partial cross-sectional structural schematic diagram cut along the EE' line shown in FIG. 6 according to another example of the embodiment of the present disclosure. The difference between the display substrate in the example shown in FIG. 10 and the display substrate in the example shown in FIG. 7 is that the position of the electrode contact portion 520 is different. The structures such as the base substrate, the light-emitting element, and the pixel definition pattern in the display substrate in the example shown in FIG. 10 can have the same characteristics as the structures such as the base substrate, the light-emitting element, and the pixel definition pattern shown in FIG. 7, and the detailed description is omitted here.

[0169] For example, as shown in FIG. 10, the electrode contact portion 520 is located between the first electrode 210 and the base substrate 100.

[0170] For example, as shown in FIG. 10, the display substrate further includes a pixel circuit electrically connected to the first electrode 210 of the light-emitting element 200, and includes a light-emitting control transistor. For example, the light-emitting control transistor includes an active layer 261, a gate 264, a source 262, and a drain 263, and the drain 263 is electrically connected to the first electrode 210 of the light-emitting element 200. For example, the electrode contact portion 520 is provided in the same layer as the source 262.

[0171] For example, as shown in FIG. 10, the display substrate further includes a first gate insulating layer 103, a second gate insulating layer 104, an interlayer insulating layer 105, a passivation layer 106, and a planarization layer 600. For example, a via or groove 601 corresponding to the trench 324 is provided in the planarization layer 600.

[0172] In some examples, as shown in FIG. 10, the planarization layer 600 is located between the first electrode 210 of the light-emitting element 200 and the base substrate 100.

[0173] For example, the electrode contact portion 520 can include a multi-layer film layer, and the multi-layer film layer can include a film layer provided in the same layer as the first electrode 210 and a film layer provided in the same layer as the source of the light-emitting control transistor.

[0174] FIG. 11 is a partial cross-sectional structural schematic diagram cut along the EE' line shown in FIG. 6 according to another example of the embodiment of the present disclosure. The difference between the display substrate in the example shown in FIG. 11 and the display substrate in the example shown in FIG. 10 is that the position of the electrode contact portion 520 is different and the structure of the planarization layer 600 is different. The structures such as the base substrate, the light-emitting element, and the pixel defining pattern in the display substrate in the example shown in FIG. 11 can have the same characteristics as the structures such as the base substrate, the light-emitting element, and the pixel defining pattern shown in FIG. 10, and the detailed description is omitted here.

[0175] In some examples, as shown in FIG. 11, the planarization layer 600 includes a planarization layer convex portion 610, and the orthographic projection of the planarization layer convex portion 610 on the base substrate 100 and the orthographic projection of the electrode contact portion 520 on the base substrate 100 overlap such that the distance between the surface on the side away from the base substrate 100 of the electrode contact portion 520 and the base substrate 100 is greater than the distance between the surface on the side away from the base substrate 100 of the first electrode 210 and the base substrate 100. By providing a planarization layer convex portion in the planarization layer, the position of the electrode contact portion can be raised, which is advantageous for the contact between the second electrode of the light-emitting element and the electrode contact portion.

[0176] For example, as shown in FIG. 11, along the direction perpendicular to the base substrate 100, the planarization layer convex portion 610 does not overlap with the light-emitting region of the light-emitting element 200.

[0177] FIG. 12 is a schematic cross-sectional structure diagram of a partial cross-section cut along the EE' line shown in FIG. 6 according to another example of the embodiment of the present disclosure. The difference between the display substrate in the example shown in FIG. 12 and the display substrate in the example shown in FIG. 11 is that the structure of the planarization layer 600 is different. The position of the electrode contact portion in the display substrate shown in FIG. 12 may be the same as the position of the electrode contact portion in the display substrate shown in FIG. 11, or may be the same as the position of the electrode contact portion in the display substrate in any of the examples shown in FIGS. 7 to 10, and this example does not limit this. The structures such as the base substrate, the light-emitting element, and the pixel defining pattern in the display substrate in the example shown in FIG. 12 can have the same characteristics as the structures such as the base substrate, the light-emitting element, and the pixel defining pattern shown in FIG. 10, and the detailed description is omitted here.

[0178] In some examples, as shown in FIG. 12, the planarization layer 600 includes a concave groove 620, and along the direction perpendicular to the base substrate 100, the defining portion 320 does not overlap with the concave groove 620. At least a part of the first electrode 210 and the light-emitting functional layer 230 of the light-emitting element 200 are located in the concave groove 620, and the surface of the light-emitting functional layer 230 closer to the base substrate 100 is closer to the base substrate 100 than the surface of the electrode contact portion 520 on the side away from the base substrate 100.

[0179] For example, the ratio of the thickness between the position where the concave groove of the planarization layer is provided and the position where the concave groove is not provided may be 0.1 to 0.9. For example, the ratio of the thickness between the position where the concave groove of the planarization layer is provided and the position where the concave groove is not provided may be 0.15 to 0.7. For example, the ratio of the thickness between the position where the concave groove of the planarization layer is provided and the position where the concave groove is not provided may be 0.2 to 0.85. For example, the ratio of the thickness between the position where the concave groove of the planarization layer is provided and the position where the concave groove is not provided may be 0.25 to 0.75. For example, the ratio of the thickness between the position where the concave groove of the planarization layer is provided and the position where the concave groove is not provided may be 0.3 to 0.85. For example, the ratio of the thickness between the position where the concave groove of the planarization layer is provided and the position where the concave groove is not provided may be 0.4 to 0.5. For example, the ratio of the thickness between the position where the concave groove of the planarization layer is provided and the position where the concave groove is not provided may be 0.35 to 0.65. For example, the ratio of the thickness between the position where the concave groove of the planarization layer is provided and the position where the concave groove is not provided may be 0.55 to 0.6.

[0180] In the display substrate provided by the embodiment of the present disclosure, by providing a concave groove in the planarization layer and providing the electrode contact portion at the interval between adjacent concave grooves and correspondingly setting the position of the electrode contact portion at a high position, it is advantageous for the contact between the second electrode of the light-emitting element and the electrode contact portion.

[0181] For example, as shown in FIG. 12, the surface of the light-emitting functional layer 230 on the side away from the base substrate 100 may be farther away from the base substrate 100 than the surface of the electrode contact portion 520 on the side away from the base substrate 100.

[0182] FIG. 13 is a schematic partial cross-sectional structure diagram cut along the EE' line shown in FIG. 6 according to another example of an embodiment of the present disclosure. The difference between the display substrate in the example shown in FIG. 13 and the display substrate in the example shown in FIG. 12 is that the depth of the concave groove 620 in the planarization layer 600 is different. In FIG. 13, the film layer between the planarization layer 600 and the base substrate 100 is not shown, and the film layer installed between the planarization layer 600 and the base substrate 100 in FIG. 13 may be referred to the film layer installed between the planarization layer 600 and the base substrate 100 shown in FIG. 12.

[0183] For example, as shown in FIG. 13, at least a part of the surface of the light-emitting functional layer 230 on the side away from the base substrate 100 may be closer to the base substrate 100 than the surface of the electrode contact portion 520 on the side away from the base substrate 100. For example, at least a part of the plurality of film layers included in the light-emitting functional film layer 230 is closer to the base substrate 100 than the electrode contact portion 520. For example, at least a part of the second electrode 220 located in the concave groove 620 is closer to the base substrate 100 than the electrode contact portion 520.

[0184] For example, as shown in FIG. 13, along the direction perpendicular to the base substrate 100, the opening 310 of the pixel definition pattern overlaps with the concave groove 620. For example, at least a part of the orthographic projection of the light conversion layer 240 in the planarization layer 600 is located in the concave groove 620. For example, the orthographic projection of the light conversion layer 240 in the planarization layer 600 is completely located in the concave groove 620.

[0185] For example, the maximum thickness of the defining portion 320 in the display substrate provided by the example shown in FIG. 13 may be smaller than the maximum thickness of the defining portion 320 in the display substrate provided by the examples shown in FIGS. 7 to 12.

[0186] In an example of an embodiment of the present disclosure, a concave groove is provided in the planarization layer, and the surface of at least a part of the film layer of the light-emitting functional layer on the side away from the base substrate is arranged to be closer to the base substrate than the surface of the electrode contact portion on the side away from the base substrate, so that the light conversion layer is completely located within the opening defined by the defining portion, and at the same time, the height of the defining portion can be made as low as possible to improve the continuity of the second electrode.

[0187] FIGS. 14 and 15 are partial cross-sectional structure schematic diagrams cut along the EE' line shown in FIG. 6 according to different examples of the embodiments of the present disclosure. The difference between the display substrate in the example shown in FIGS. 14 and 15 and the display substrate in the example shown in FIG. 13 is that a transparent compensation structure 630 is provided in the concave groove 620 in the planarization layer 600. The difference between the display substrates in the examples shown in FIGS. 14 and 15 is that the positions of the transparent compensation structures 630 are different. The structures such as the base substrate, the first insulating layer, the light-emitting functional layer, the pixel defining pattern, and the first electrode in the display substrates shown in FIGS. 14 and 15 can have the same characteristics as the structures such as the base substrate, the first insulating layer, the light-emitting functional layer, the pixel defining pattern, and the first electrode in the display substrate shown in FIG. 13, and the detailed description is omitted here.

[0188] In some examples, as shown in FIGS. 14 and 15, the display substrate further includes a transparent compensation structure 630 located between the light conversion layer 240 and the bottom of the concave groove 620.

[0189] In the display substrate provided in this example, by filling the transparent compensation structure between the concave groove and the light conversion layer, the light conversion layer can be formed on as flat a surface as possible, improving the flatness of the light conversion layer formed in the concave groove and improving the display effect.

[0190] For example, as shown in FIG. 14, the transparent compensation structure 630 can be located between the first electrode 210 and the planarization layer 600.

[0191] For example, as shown in FIG. 15, the transparent compensation structure 630 can be located between the light conversion layer 240 and the second electrode 210.

[0192] For example, as shown in FIG. 15, the transparent compensation structure 630 may be a part of the film layer in the first insulating layer 400. For example, the first insulating layer 400 may be a sealing layer, and the thickness of the portion located in the concave groove 620 of the sealing layer is greater than the thickness of the portion located at positions other than the concave groove 620. For example, the sealing layer located in the concave groove 620 may include an organic sealing layer.

[0193] For example, the transparent compensation structure 630 may be a lens.

[0194] Of course, the embodiments of the present disclosure are not limited to improving the flatness of the middle part of the light conversion layer by filling the transparent compensation structure in the concave groove. The flatness of the middle part of the light conversion layer can also be improved by forming the light conversion layer in layers.

[0195] In some examples, as shown in FIGS. 13 to 15, the side wall 621 of the concave groove 620 is installed obliquely, and the portion of the side wall 621 away from the base substrate 100 is farther from the center of the light emitting region of the light emitting element installed in the concave groove 620 than the portion close to the base substrate 100. For example, the side wall of the concave groove 620 is inclined outward. The above-mentioned outer side refers to the side facing the edge of the center of the light emitting element surrounded by the concave groove.

[0196] For example, the pattern obtained by cutting the side wall 621 of the concave groove 620 with a plane perpendicular to the base substrate 100 (for example, the XZ plane) may be a straight line or a curve.

[0197] In the examples of the embodiments of the present disclosure, it is advantageous to improve the light emitting efficiency of the entire surface by installing the side wall of the concave groove in the planarization layer obliquely.

[0198] Figs. 16 to 17B are schematic partial planar structure diagrams of a display substrate according to different examples of the present disclosure. The difference between the display substrate in the examples shown in Figs. 16 to 17B and the display substrate in the example shown in Fig. 6 is that the defining portion 320 in the display substrate shown in Figs. 16 to 17B includes an opening 325. For example, the second electrode of the light-emitting element can be electrically connected to the electrode contact portion 520 through a plurality of openings 325. The difference in the display substrate in the examples shown in Figs. 16 to 17B is that the shape of the light-emitting region of the light-emitting element is different. The features such as the base substrate, the defining portion, and the light-emitting element in the display substrate in the examples shown in Figs. 16 to 17B may be the same as the features such as the base substrate, the defining portion, and the light-emitting element in the display substrate in the above examples, and detailed descriptions are omitted here.

[0199] For example, as shown in Figs. 16 to 17B, the electrode contact portion 520 may be installed only at a position corresponding to the opening 325, or the electrode contact portion 520 having an extending direction the same as the extending direction of the defining portion 320 may be installed.

[0200] In the display substrate provided by the embodiments of the present disclosure, by installing a plurality of openings in the defining portion, the electrical connection effect between the second electrode and the electrode contact portion can be improved, and at the same time, the occurrence of the problem of short circuit or leakage between the first electrode and the second electrode and the electrode contact portion at the connection position can be avoided as much as possible.

[0201] For example, in at least some of the openings 325, the center of the portion between the second electrode 220 and the electrode contact portion 520 does not overlap with the center of the opening 325. For example, in at least some of the openings 25, the area of the portion between the second electrode 220 and the electrode contact portion 520 is smaller than the area of the orthographic projection of the electrode contact portion 520 of the opening 325.

[0202] For example, as shown in Fig. 16, the openings 325 arranged along the row direction can be arranged at equal intervals, and the openings 325 arranged along the row direction can be located on the same straight line, and the openings 325 arranged along the column direction can be arranged at equal intervals, and the openings 325 arranged along the column direction can be located on the same straight line.

[0203] For example, the spacing between the apertures 325 arranged along the row direction may be the same as the spacing between the apertures 325 arranged along the column direction.

[0204] For example, some of the apertures 325 may be blind holes, that is, the light-emitting functional layer within the aperture 325 is not removed, and the second electrode does not contact the electrode contact portion at the position of the blind hole. Installing blind holes is advantageous for improving the process efficiency.

[0205] In some examples, as shown in FIGS. 16 to 17A, the largest interval among the intervals between the light-emitting regions of adjacent light-emitting elements 200 of different colors and the intervals between adjacent light-emitting elements 200 of the same color overlaps with the aperture 325.

[0206] For example, as shown in FIGS. 16 to 17A, between the column in which the first light-emitting element 201 adjacent to each other is located and the column in which the third light-emitting element 203 is located, there is an interval 204 with the largest size between the light-emitting regions, and an aperture 325 is installed in the interval 204, which is advantageous for avoiding the occurrence of problems such as short circuit or leakage between the first electrode at the connection position between the second electrode and the electrode contact portion.

[0207] The above-mentioned "column where it is located" means that a plurality of first light-emitting elements arranged along the Y direction form one column, a plurality of second light-emitting elements arranged along the Y direction form one column, and a plurality of third light-emitting elements arranged along the Y direction form one column.

[0208] Of course, the embodiments of the present disclosure are not limited to this. For example, as shown in FIG. 17A, an aperture 325 may be installed at the position of the largest interval 205 between the column where the third light-emitting element 203 is located and the column where the second light-emitting element 202 is located. For example, the maximum size of the interval 205 is smaller than the maximum size of the interval 204.

[0209] For example, as shown in FIGS. 16 to 17A, an aperture 325 may be provided between adjacent light-emitting elements of different colors. For example, an aperture 325 may be provided between adjacent light-emitting elements of the same color. For example, the aperture 325 may be provided at a position where the size of the interval between the light-emitting regions of adjacent light-emitting elements of the same color is the largest. For example, the aperture 325 may be provided at a position where the size of the interval between the light-emitting regions of adjacent light-emitting elements of different colors is the smallest.

[0210] For example, as shown in FIG. 17B, the first light-emitting element 201 may be a red light-emitting element, the second light-emitting element 202 may be a green light-emitting element, and the third light-emitting element 203 may be a blue light-emitting element. For example, the shape of the light-emitting region of the green light-emitting element 202 may be hexagonal or octagonal. For example, the shape of the light-emitting region of the green light-emitting element 202 may be an axisymmetric figure. For example, the axis of symmetry extends along the Y direction. For example, the shape of at least one of the light-emitting regions of the blue light-emitting element 203 and the red light-emitting element 201 may be octagonal. For example, at least one of the light-emitting regions of the blue light-emitting element 203 and the red light-emitting element 201 may be an asymmetric figure in the Y direction. For example, the plurality of light-emitting elements 200 may be arranged as two sub-light-emitting element rows. One sub-light-emitting element row includes red light-emitting elements 201 and blue light-emitting elements 203 alternately arranged along the row direction (for example, the X direction), and the other sub-light-emitting element row includes green light-emitting elements 202 arranged along the row direction. In the row direction, the distance between the light-emitting regions of two adjacent green light-emitting elements 202 is greater than the distance between the light-emitting regions of the adjacent blue light-emitting element 203 and the red light-emitting element 201. The aperture 325 is provided between the light-emitting regions of two adjacent green light-emitting elements 202 in the row direction. For example, at least one of the distance between the light-emitting regions of adjacent red light-emitting elements 201 arranged in the column direction (for example, the Y direction) and the distance between the light-emitting regions of adjacent blue light-emitting elements 203 arranged in the column direction is greater than the distance between the light-emitting regions of adjacent green light-emitting elements 202 arranged in the column direction. The aperture 325 may be provided between the light-emitting regions of adjacent red light-emitting elements 201 arranged in the column direction.

[0211] FIG. 18 is a schematic cross-sectional structure diagram of a partial cross-section cut along line AA' shown in FIG. 1A according to another example of an embodiment of the present disclosure. The difference between the display substrate in the example shown in FIG. 18 and the display substrate in the example shown in FIG. 2 is that the display substrate further includes a spacer (PS) 340 located on the surface on the side away from at least a part of the base substrate 100 of the defining portion 320.

[0212] For example, the spacer 340 is located between the defining portion 320 and the second electrode 220. For example, the spacer 340 is configured to support a vapor deposition mask plate for manufacturing the light-emitting functional layer.

[0213] For example, the orthographic projection of the spacer 340 on the base substrate 100 is completely located within the orthographic projection of the defining portion 320 on the base substrate 100.

[0214] For example, as shown in FIG. 18, the surface of the light conversion layer 240 on the side away from the base substrate 100 is farther from the base substrate 100 than the surface of the defining portion 320 on the side away from the base substrate 100. For example, the surface of the light conversion layer 240 on the side away from the base substrate 100 is closer to the base substrate 100 than the surface of the spacer 340 on the side away from the base substrate 100.

[0215] By providing a spacer on the surface of the defining portion on the side away from the base substrate, the light conversion layer can be defined using the opening formed by the spacer, and the maximum thickness of the defining portion of the pixel defining pattern can be set to be smaller than the thickness of the light conversion layer, which is advantageous for improving the continuity of the second electrode.

[0216] For example, the maximum thickness of the first sub-defining portion in the pixel defining pattern is substantially the same as the maximum thickness of the second sub-defining portion. For example, the spacer 340 is provided only on the surface of the first sub-defining portion 321 and the annular defining portion 323 on the side away from the base substrate 100, and the spacer 340 is not provided on the surface of the second sub-defining portion 322 on the side away from the base substrate 100.

[0217] For example, a trench shown in FIG. 6 may be provided at a position where the spacer 340 of the defining portion 320 is not installed. For example, a trench is provided at a position where the spacer 340 of the first sub-defining portion 321 is not installed, whereby the second electrode 220 and the electrode contact portion can be electrically connected.

[0218] For example, the size of the spacer 340 in the direction parallel to the base substrate 100 is smaller than the size of the defining portion 320 in that direction, which is advantageous for improving the continuity of the second electrode formed on the defining portion and the spacer.

[0219] FIG. 19 is a schematic partial cross-sectional structure diagram cut along the line AA' shown in FIG. 1A according to another example of an embodiment of the present disclosure. The difference between the display substrate in the example shown in FIG. 19 and the display substrate in the example shown in FIG. 2 is that the defining portion 320 includes a first defining portion 3201 and a second defining portion 3202 which are stacked, the first defining portion 3201 is located closer to the base substrate 100 of the second defining portion 3202, and the surface of the light conversion layer 240 closer to the base substrate 100 is closer to the base substrate 100 than the surface of at least a part of the second defining portion 3202 away from the base substrate 100. The structures of the light-emitting element, the base substrate, the first insulating layer, etc. in the display substrate provided in this example can have the same characteristics as the structures of the light-emitting element, the base substrate, the first insulating layer, etc. in the display substrate in any of the examples shown in FIGS. 2 to 17A, and the detailed description is omitted here.

[0220] For example, as shown in FIG. 19, the surface of the first defining portion 3201 away from the base substrate 100 is closer to the base substrate 100 than the surface of the light conversion layer 240 away from the base substrate 100, the surface of the second defining portion 3202 away from the base substrate 100 is farther from the base substrate 100 than the surface of the light conversion layer 240 away from the base substrate 100, the opening 311 defined by the first defining portion 3201 can be used to define the light-emitting functional layer 230, and the opening 312 defined by the second defining portion 3202 can be used to define the light conversion layer 240.

[0221] The display substrate provided in this example is installed with a first defining portion and a second defining portion in which the defining portions are stacked, which is advantageous for improving the overall thickness of the defining portions to form an opening region for defining the light conversion layer, and is advantageous for flexibly setting the thickness of the light conversion layer.

[0222] For example, the maximum size of the orthographic projection on the base substrate 100 of the opening 311 defined by the first defining portion 3201 may be smaller than the maximum size of the orthographic projection on the base substrate 100 of the opening 312 defined by the second defining portion 3202. Of course, the embodiments of the present disclosure are not limited thereto, and the maximum size of the orthographic projection on the base substrate 100 of the opening 311 may be greater than or equal to the maximum size of the orthographic projection on the base substrate 100 of the opening 312.

[0223] For example, as shown in FIG. 19, in the direction perpendicular to the base substrate 100, the maximum size of the first defining portion 3201 may be larger than the maximum size of the second defining portion 3202.

[0224] In some examples, as shown in FIG. 19, a first insulating layer 400 is installed between the first defining portion 3201 and the second defining portion 3202. For example, a second electrode 220 is further installed between the first defining portion 3201 and the second defining portion 3202. For example, a light-emitting functional layer 230 is further installed between the first defining portion 3201 and the second defining portion 3202.

[0225] In this example, the defining portions are installed as a first defining portion and a second defining portion in which the defining portions are stacked, and a first insulating layer such as a sealing layer is installed between the first defining portion and the second defining portion, so as to increase the overall thickness of the defining portions to form an opening for defining the light conversion layer, and at the same time, the thickness of the first defining portion is set to be small, so that the continuity of the second electrode formed on the first defining portion can be improved.

[0226] For example, in FIG. 19, it is schematically shown that the thickness of the first defining portion 3201 is greater than the thickness of the second defining portion 3202. However, the present invention is not limited thereto. The thickness of the first defining portion can be made smaller than the thickness of the second defining portion to further improve the continuity of the second electrode formed on the first defining portion.

[0227] For example, the defining portion shown in FIG. 19 may include a first sub-defining portion and a second sub-defining portion having different thicknesses in the examples shown in FIGS. 2 to 3, or may include the first sub-defining portion and the second sub-defining portion in the example shown in FIG. 5, or may include a grooved portion shown in FIG. 6 and an electrode contact portion disposed opposite to the grooved portion, or may include a through hole shown in FIG. 16 and an electrode contact portion disposed opposite to the through hole, or may include a spacer shown in FIG. 18. The present example does not limit this.

[0228] For example, the surface of the planarization layer in the display substrate shown in FIG. 19 on the side away from the base substrate may be a flat surface, or may include a concave groove in the planarization layer shown in any one of FIGS. 12 to 15, or may include a convex portion of the planarization layer shown in FIG. 11.

[0229] FIG. 20 is a schematic cross-sectional structure diagram of a partial cut along the line AA' shown in FIG. 1A according to another example of the embodiment of the present disclosure. The difference between the display substrate in the example shown in FIG. 20 and the display substrate in the example shown in FIG. 19 is that the first defining portion 3201 is in direct contact with the second defining portion 3202. The structures such as the light-emitting element, the base substrate, and the first insulating layer in the display substrate provided by the present example can have the same characteristics as the structures such as the light-emitting element, the base substrate, and the first insulating layer in the display substrate in any of the examples shown in FIGS. 2 to 17A, and the detailed description thereof is omitted here.

[0230] In some examples, as shown in FIG. 20, the defining part 320 includes a structure with at least two layers stacked on top of each other. Although FIG. 20 schematically shows that the defining part 320 includes a two-layer structure, it is not limited thereto, and the defining part can further include a structure with three or more layers stacked on top of each other. For example, any two adjacent layers among the multi-layer structures included in the defining part are in direct contact, or one layer structure that is farthest from the base substrate among the multi-layer structures included in the defining part is located on the side away from the base substrate of the first insulating layer, or at least two layer structures among the multi-layer structures included in the defining part are located on the side away from the base substrate of the first insulating layer.

[0231] For example, as shown in FIG. 20, the first insulating layer 400 is located on the side away from the first defining part 3201 of the second defining part 3202. For example, the second electrode 220 is located on the side away from the first defining part 3201 of the second defining part 3202.

[0232] For example, as shown in FIG. 20, along the direction perpendicular to the base substrate 100, the maximum size of the first defining part 3201 may be larger than the maximum size of the second defining part 3202, but it is not limited thereto. Along the direction perpendicular to the base substrate, the size of the first defining part may be less than or equal to the maximum size of the second defining part.

[0233] For example, as shown in FIG. 20, the angle of inclination of the slope formed on the surface of the second defining part 3202 away from the base substrate 100 may be smaller than the angle of inclination of the slope formed on the surface of the first defining part 3201 away from the base substrate 100, thereby improving the continuity of the second electrode formed on the second defining part.

[0234] For example, the stacked first defining part shown in FIG. 20 can include the trench shown in FIG. 11, and the second defining part may not overlap with the trench. For example, the same first defining part can include two trenches to form three parts. The second defining part is installed on the first defining part located in the middle part, and there is no second defining part on the first defining parts located on both sides, thereby exposing the trench by the second defining part.

[0235] For example, as shown in FIG. 20, the shapes of the cross-sections of the first defining portion 3201 and the second defining portion 3202 cut in a plane perpendicular to the base substrate 100, for example, the XZ plane, may be the same. For example, both may be trapezoids, and the bottom surface on the side away from the trapezoidal base substrate 100 is the upper base, and the bottom surface on the side close to the trapezoidal base substrate 100 is the lower base, and the length of the lower base is greater than the length of the upper base. However, the embodiments of the present disclosure are not limited thereto, and the shapes of the cross-sections of the first defining portion and the second defining portion cut in a plane perpendicular to the base substrate may be different. For example, the shape of the cross-section of one of the first defining portion and the second defining portion is a trapezoid, and the shape of the cross-section of the other is a rectangle. For example, the shape of the first defining portion is stepped, and the shape of the second defining portion is a trapezoid, rectangle, triangle, circular arc, etc. The embodiments of the present disclosure do not limit the shapes of the cross-sections of the first defining portion and the second defining portion.

[0236] For example, the cross-section of the second defining portion 3202 cut in a plane perpendicular to the base substrate 100 may be a trapezoid, and the angle between the hypotenuse and the lower base of the trapezoid is small, for example, 45° or less, which is advantageous for increasing the ratio of the maximum opening defining the light-emitting functional layer to the maximum opening defining the light-converting layer.

[0237] For example, the materials of the first defining portion 3201 and the second defining portion 3202 may be the same or different.

[0238] For example, among the two surfaces of the first defining portion 3201 and the second defining portion 3202 that are in contact with each other, the maximum size along the direction parallel to the base substrate 100 of the surface of the first defining portion 3201 may be smaller than the maximum size along the direction parallel to the base substrate 100 of the surface of the second defining portion 3202, whereby an undercut structure can be formed.

[0239] FIG. 21 is a schematic cross-sectional structure diagram of a partial cross-section cut along the line AA' shown in FIG. 1A according to another example of an embodiment of the present disclosure. The difference between the display substrate in the example shown in FIG. 21 and the display substrate in the example shown in FIG. 2 is that the display substrate further includes a separation structure 350 located between the second electrode 220 and the defining portion 320. The structures such as the light-emitting element, the base substrate, and the first insulating layer in the display substrate provided in this example can have the same characteristics as the structures such as the light-emitting element, the base substrate, and the first insulating layer in any of the examples shown in FIGS. 2 to 17A, and detailed descriptions thereof are omitted here.

[0240] In some examples, as shown in FIG. 21, along the direction perpendicular to the base substrate 100, the separation structure 350 overlaps with the defining portion 320, and the materials of the separation structure 350 and the defining portion 320 are different. Along the arrangement direction of the adjacent light-emitting elements, in the separation structure 350 located between the adjacent light-emitting elements, the edge of the separation structure 350 protrudes with respect to the edge of the defining portion 320 to form a protruding portion.

[0241] For example, the material of the separation structure 350 includes an inorganic non-metallic material. For example, the material of the separation structure 350 includes any one or more of silicon nitride, silicon oxide, or silicon oxynitride.

[0242] For example, by setting the shape of the separation structure 350, the light-emitting functional layer 230 is cut by the protruding portion, and the second electrode 220 is continuously installed by the protruding portion. For example, the ratio of the sum of the thicknesses of the separation structure 350 and the defining portion 320 to the thickness of the light-emitting functional layer 230 is 0.7 to 1.5. For example, the included angle between at least a partial side surface of the separation structure 350 and a plane parallel to the base substrate 100 is greater than 60°. For example, along the direction parallel to the base substrate 100, the size of the protruding portion is 0.01 micron or more. For example, the surface of the separation structure 350 on the side away from the base substrate 100 is a curved surface that curves toward one side of the base substrate 100.

[0243] For example, as shown in FIG. 21, the surface of the light conversion layer 240 on the side away from the base substrate 100 is farther from the base substrate 100 than the surface of the defining portion 320 on the side away from the base substrate 100. For example, the surface of the light conversion layer 240 on the side away from the base substrate 100 is closer to the base substrate 100 than the surface of the separation structure 350 on the side away from the base substrate 100.

[0244] By providing a separation structure on the surface of the defining portion on the side away from the base substrate, the light conversion layer can be defined in the opening region formed by the separation structure, and the maximum thickness of the defining portion of the pixel defining pattern can be set to be smaller than the thickness of the light conversion layer, which is advantageous for improving the continuity of the second electrode.

[0245] For example, the maximum thickness of the first sub-defining portion in the pixel defining pattern is approximately the same as the maximum thickness of the second sub-defining portion. For example, the separation structure 350 is provided only on the surface of the first sub-defining portion 321 and the annular defining portion 323 on the side away from the base substrate 100, and the separation structure 350 is not provided on the surface of the second sub-defining portion 322 on the side away from the base substrate 100.

[0246] For example, a trench 324 shown in FIG. 6 is provided in the defining portion 320 and the separation structure 350, whereby the second electrode 220 and the electrode contact portion can be electrically connected.

[0247] For example, the size of the separation structure 350 in the direction parallel to the base substrate 100 is smaller than the size of the defining portion 320 in the same direction, which is advantageous for improving the continuity of the second electrode formed on the defining portion and the spacer.

[0248] FIGS. 22 to 26 are schematic cross-sectional structure diagrams of a defining portion in a display substrate according to different examples. For example, as shown in FIGS. 22 to 26, the defining portion 320 may have a single-layer structure. Of course, the embodiments of the present disclosure are not limited thereto, and the defining portion may further include a multi-layer stacked structure in which any of the shapes shown in FIGS. 22 to 26 is formed.

[0249] In some examples, as shown in FIGS. 22 to 26, the cross-section obtained by cutting in the plane where the center connection line of the light-emitting regions of two adjacent light-emitting elements 200 located on both sides of the defining portion 320 is located is the defining portion cross-section 3200. The shape of the defining portion cross-section 3200 includes a trapezoid or a stepped shape, and the plane is perpendicular to the base substrate 100. For example, the plane may be the XZ plane.

[0250] For example, as shown in FIG. 22, the shape of the defining portion cross-section 3200 may be a trapezoid. The upper base of the trapezoid is closer to the base substrate 100 than the lower base, for example, an inverted trapezoid. For example, the size of the surface of the defining portion 320 on the side away from the base substrate 100 in the X direction is larger than the size of the surface of the defining portion 320 on the side close to the base substrate 100 in the X direction. By forming the shape of the defining portion cross-section into an inverted trapezoid, the size of the maximum opening defining the light-emitting functional layer can be made larger than the size of the maximum opening defining the light-converting layer, and color shift of light of different colors can be avoided. For example, in order to further avoid color shift, a reflective layer or reflective particles can also be provided on the side surface or inside of the defining portion.

[0251] For example, as shown in FIG. 23, the shape of the defining portion cross-section 3200 may be a stepped shape. By forming the shape of the defining portion cross-section into a stepped shape, the size of the maximum opening defining the light-emitting functional layer can be made smaller than the size of the maximum opening defining the light-converting layer, and the light emitted from the light-emitting element can be maximally incident on the light-converting layer.

[0252] For example, as shown in FIG. 24, the shape of the defining portion cross-section 3200 may be a trapezoid. The upper base of the trapezoid is farther from the base substrate 100 than the lower base. For example, the size of the surface of the defining portion 320 on the side away from the base substrate 100 in the X direction is smaller than the size of the surface of the defining portion 320 on the side close to the base substrate 100 in the X direction.

[0253] For example, as shown in FIG. 24, the shape of the defining portion cross-section 3200 of the defining portion 320 that defines the light-emitting regions of different light-emitting elements 200 is different. For example, the angle between the hypotenuse of the defining portion cross-section 3200 that defines the third light-emitting element 203 and the plane parallel to the base substrate 100, which faces the light-emitting region of the third light-emitting element 203, is smaller than the angle between the hypotenuse of the defining portion cross-section 3200 that is away from the light-emitting region of the third light-emitting element 203 and the plane, which is advantageous for adjusting the light-emitting angles and light-emitting efficiencies of light-emitting elements of different colors.

[0254] For example, the third light-emitting element 203 may be a blue light-emitting element, a red light-emitting element, or a green light-emitting element.

[0255] In some examples, as shown in FIGS. 25 and 26, the cross-section cut by the plane in which the center connection line of the light-emitting regions of two adjacent light-emitting elements 200 located on both sides of the defining portion 320 is located is the defining portion cross-section 3200. The size of the middle portion of the defining portion cross-section 3200 in the direction parallel to the base substrate 100 is larger or smaller than the size of the two side portions in the direction parallel to the base substrate 100, and the plane is perpendicular to the base substrate 100. For example, the plane may be the XZ plane.

[0256] For example, as shown in FIG. 25, the defining portion cross-section 3200 of the defining portion 320 may have a structure with a concave middle.

[0257] For example, as shown in FIG. 26, the defining portion cross-section 3200 of the defining portion 320 may have a structure with a convex middle.

[0258] For example, the defining portion having any of the shapes shown in FIGS. 22 to 26 may include a first sub-defining portion and a second sub-defining portion with different thicknesses in the example shown in FIGS. 2 to 3, or may include the first sub-defining portion and the second sub-defining portion in the example shown in FIG. 5, or may include the open groove shown in FIG. 6 and the electrode contact portion installed opposite to the open groove, or may include the opening shown in FIG. 16 and the electrode contact portion installed opposite to the opening, or may include the spacer shown in FIG. 18. This example does not limit this.

[0259] For example, the surface of the planarization layer in the display substrate shown in FIGS. 22 to 26 on the side away from the base substrate may be a flat surface, or may include concave grooves in the planarization layer shown in any of FIGS. 12 to 15, or may include convex portions of the planarization layer shown in FIG. 11.

[0260] FIG. 27 is a schematic partial cross-sectional structure diagram cut along the line AA' shown in FIG. 1A according to another example of the embodiment of the present disclosure. The difference between the display substrate in the example shown in FIG. 27 and the display substrate in the example shown in FIG. 2 is that the display substrate further includes a second insulating layer 710 located on the side away from the base substrate 100 of the light conversion layer 240.

[0261] For example, the second insulating layer 710 may be a sealing layer that seals the light conversion layer 240.

[0262] In some examples, as shown in FIG. 27, the second insulating layer 710 includes refractive particles 711. For example, the material of the refractive particles 711 can include zirconium oxide.

[0263] By providing a second insulating layer having refractive particles on the light-emitting side of the light conversion layer, it is advantageous to improve the light-emitting efficiency.

[0264] The structures such as the pixel definition pattern, light-emitting element, base substrate, and first insulating layer in the display substrate shown in FIG. 27 can have the same characteristics as the structures such as the pixel definition pattern, light-emitting element, base substrate, and first insulating layer in any of FIGS. 2 to 26, and the detailed description is omitted here.

[0265] FIG. 28 is a schematic partial cross-sectional structure diagram cut along the line AA' shown in FIG. 1A according to another example of the embodiment of the present disclosure. The difference between the display substrate in the example shown in FIG. 28 and the display substrate in the example shown in FIG. 27 is that the display substrate further includes a color filter layer 720 located on the side away from the light conversion layer 240 of the second insulating layer 710.

[0266] For example, as shown in FIG. 28, the color filter layer 720 includes a portion located in the light-emitting region and a portion located in an adjacent light-emitting region. For example, the first light-emitting element 201 may be a red light-emitting element, and the color filter corresponding to the first light-emitting element 201 in the color filter layer 720 may be a red color filter. The second light-emitting element 202 may be a green light-emitting element, and the color filter corresponding to the second light-emitting element 202 in the color filter layer 720 may be a green color filter. The third light-emitting element 203 may be a blue light-emitting element, and the material corresponding to the third light-emitting element 203 in the color filter layer 720 may be a blue color filter.

[0267] For example, the color filter layer 720 installed in the defining portion 320 between the light-emitting regions of adjacent light-emitting elements can be stacked to serve a filtering role. For example, a stack of a red color filter and a green color filter is installed in the defining portion 320 between the light-emitting region of the first light-emitting element 201 and the light-emitting region of the second light-emitting element 202, and a stack of a green color filter and a blue color filter is installed in the defining portion 320 between the light-emitting region of the second light-emitting element 202 and the light-emitting region of the third light-emitting element 203.

[0268] For example, the color filter layer shown in FIG. 28 can use the COE (Color On Encapsulation) technology, and by forming a color filter on the encapsulation layer, the contrast of the display device can be improved.

[0269] For example, as shown in FIG. 28, after the second insulating layer 710 is formed on the light conversion layer 240, a concave groove is formed at a position corresponding to the light conversion layer 240. The concave groove is directly opposite to the opening of the pixel defining pattern, and the color filter layer 720 includes a portion formed in the concave groove. For example, the surface of the color filter layer 720 closer to the base substrate 100 may be a flat surface, and at least a part of the surface of the color filter layer 720 away from the base substrate may be a surface recessed toward one side of the base substrate 100.

[0270] Of course, the embodiments of the present disclosure are not limited thereto. A cover plate may be installed on the display side of the display substrate, and the color filter layer may be installed on the side of the cover plate facing the display substrate.

[0271] FIG. 29 is a display substrate according to another embodiment of the present disclosure. As shown in FIG. 29, the display substrate includes a base substrate 100, a plurality of light-emitting elements 200 located on the base substrate 100, and a pixel definition pattern 300. The light-emitting element 200 includes a light-emitting functional layer 230, and a first electrode 210 and a second electrode 220 located on both sides of the light-emitting functional layer 230 along a direction perpendicular to the base substrate 100. The first electrode 210 is located between the light-emitting functional layer 230 and the base substrate 100. The pixel definition pattern 300 is located on the side of the first electrode 210 away from the base substrate 100. The pixel definition pattern 300 includes a plurality of openings 310 and a defining portion 320 surrounding the plurality of openings 310. The light-emitting element 200 is at least partially located within the opening 310. At least one light-emitting element 200 further includes a light conversion layer 240. The light conversion layer 240 is configured to emit light of another color after light of one color is incident on the light conversion layer. The light conversion layer 240 is located on the side of the first electrode 210 away from the second electrode 220.

[0272] In the display substrate provided by the embodiment of the present disclosure, by installing the light conversion layer on the side of the first electrode away from the second electrode, the distance between the light conversion layer and the light-emitting functional layer can be reduced as much as possible, and the conversion efficiency of the light incident on the light conversion layer can be improved.

[0273] For example, the light-emitting functional layer 230 in the display substrate shown in FIG. 29 can have the same characteristics as the light-emitting functional layer 230 in the display substrate shown in FIG. 1A, and detailed description thereof is omitted here.

[0274] For example, in the display substrate shown in FIG. 29, the first electrode 210 of the light-emitting element 200 is a light-transmissive electrode, and the second electrode 220 is a reflective electrode. For example, the light emitted from the light-emitting functional layer 230 is reflected by the second electrode 220 to the side of the first electrode 210 away from the second electrode 220, and is emitted after passing through the light conversion layer 240.

[0275] For example, the maximum size in the direction perpendicular to the base substrate 100 of the defining portion in the display substrate shown in FIG. 29, such as the thickness, can be set to be small, and it is used to define the region where the light-emitting functional layer of the light-emitting element is formed. In this display substrate, by setting the thickness of the defining portion to be small, it is advantageous for improving the continuity of the second electrode.

[0276] For example, as shown in FIG. 29, the light conversion layer 240 is located on the side away from the first electrode 210 of the base substrate 100.

[0277] For example, the light conversion layer 240 and the light transmission functional layer 250 in the display substrate shown in FIG. 29 can have the same characteristics as the light conversion layer 230 and the light transmission functional layer 250 in the display substrate shown in FIGS. 1A to 2, and the detailed description is omitted here.

[0278] For example, as shown in FIG. 29, on the side away from the first electrode 210 of the base substrate 100, a partition structure 800 for defining the positions of the light conversion layer 230 and the light transmission functional layer 250 is provided.

[0279] For example, as shown in FIG. 29, the orthographic projection of the partition structure 800 on the base substrate 100 overlaps with the orthographic projection of the defining portion 320 on the base substrate 100.

[0280] For example, as shown in FIG. 29, the opening region formed by the partition structure 800 is used to form the light conversion layer 240 and the light transmission functional layer 250.

[0281] For example, in the defining portion 320 in the display substrate shown in FIG. 29, a defining portion including a first sub-defining portion and a second sub-defining portion with different thicknesses in the examples shown in FIGS. 2 to 3 may be provided, or the first sub-defining portion and the second sub-defining portion in the example shown in FIG. 5 may be provided, or the grooved opening shown in FIG. 6 and the electrode contact portion provided opposite to the grooved opening may be provided, or the opening shown in FIG. 16 and the electrode contact portion provided opposite to the opening may be provided.

[0282] For example, the display substrate shown in FIG. 29 may include the planarization layers shown in FIGS. 10 to 15.

[0283] For example, as shown in FIG. 29, a base 810 is installed on the side of the light conversion layer 240 away from the base substrate 100. For example, the surface on the side of the light conversion layer 240 away from the base substrate 100 may be a flat surface, and the surface on the side of the light conversion layer 240 close to the base substrate 100 may be a surface recessed toward the side away from the base substrate 100.

[0284] For example, a color filter layer may be installed between the light conversion layer 240 and the base 810.

[0285] For example, as shown in FIG. 29, the display substrate further includes a first insulating layer 400 located on the side of the second electrode 220 away from the base substrate 100. The first insulating layer 400 may be a sealing layer, and the sealing layer may include an organic sealing layer and an inorganic sealing layer installed in a stacked manner.

[0286] FIG. 30 is a schematic partial cross-sectional structure diagram of a display device according to another embodiment of the present disclosure. As shown in FIG. 30, the display device includes the display substrate 10 shown in any of the above examples. In FIG. 30, it is schematically shown that the display device includes the display substrate shown in FIG. 2, but it is not limited thereto, and it may further include any of the display substrates shown in FIGS. 4A to 29. As shown in FIG. 30, the display device further includes a counter substrate 20 installed opposite to the display substrate 10, and the counter substrate 20 is located on the display side of the display substrate 10.

[0287] For example, as shown in FIG. 30, the light emitted from the light-emitting element is emitted from the side of the second electrode 220 away from the base substrate 100, and the counter substrate 20 is located on the side of the second electrode 220 away from the base substrate 100. However, it is not limited thereto. When the light emitted from the light-emitting element is emitted from the side of the second electrode of the base substrate away from the base substrate, the counter substrate is located on the side of the second electrode of the base substrate away from the base substrate.

[0288] In some examples, as shown in FIG. 30, the material layer 21 installed at a position directly opposite to the light conversion layer 240 on the side of the counter substrate 20 facing the display substrate 10 includes the same material as that of the light conversion layer 240.

[0289] By installing a material layer with the same material as that of the light conversion layer on the counter substrate, it is advantageous for reducing the thickness of the counter substrate and improving the light conversion efficiency.

[0290] For example, as shown in FIG. 30, the counter substrate 20 may include a cover plate 23 and a partition structure 22 located on the side of the cover plate 21 facing the display substrate 10, and the material layer 21 is defined by an opening formed by the partition structure 22.

[0291] For example, the display device may further include a color filter layer (not shown), and the color filter layer may be installed on the side of the material layer away from the display substrate.

[0292] For example, the display device provided by the embodiments of the present disclosure may be an organic light-emitting diode display device.

[0293] For example, the display device may be any product or component having a display function, such as a mobile phone, a tablet computer, a notebook computer, a navigator, etc., having a camera under the screen, and the present embodiment is not limited thereto.

[0294] The following points need to be explained.

[0295] (1) The drawings of the embodiments of the present disclosure are only related to the structures related to the embodiments of the present disclosure, and other structures may refer to normal designs.

[0296] (2) When there is no conflict, the features in the same embodiment and different embodiments of the present disclosure can be combined with each other.

[0297] The above are only exemplary embodiments of the present disclosure and are not intended to limit the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.

Claims

1. A display substrate, comprising: a base substrate; a plurality of light-emitting elements located on the base substrate, including a light-emitting functional layer, a first electrode and a second electrode located on both sides of the light-emitting functional layer along a direction perpendicular to the base substrate, wherein the first electrode is located between the light-emitting functional layer and the base substrate; a pixel definition pattern located on a side of the first electrode away from the base substrate, including a plurality of openings and a defining portion surrounding the plurality of openings, wherein the light-emitting element is at least partially located within the opening; at least one light-emitting element further includes a light conversion layer configured to emit light of another color after light of one color is incident on the light conversion layer, the light conversion layer is located on a side of the second electrode away from the base substrate, and at least a part of the light conversion layer is located within the opening, and a surface of the part of the light conversion layer located within the opening close to the base substrate is closer to the base substrate than a surface of at least a part of the defining portion away from the base substrate.

2. The display substrate according to claim 1, wherein a surface of the part of the light conversion layer located within the opening away from the base substrate is closer to the base substrate than a surface of at least a part of the defining portion away from the base substrate.

3. The display substrate according to claim 1 or 2, wherein a central portion of a surface of the part of the light conversion layer located within the opening away from the base substrate is closer to the base substrate than an edge portion.

4. The display substrate according to any one of claims 1 to 3, wherein the light conversion layer includes quantum dots.

5. further including a first insulating layer located between the light conversion layer and the second electrode; The display substrate according to any one of claims 1 to 4, wherein a surface of the part of the first insulating layer located within the opening away from the base substrate is closer to the base substrate than a surface of at least a part of the defining portion away from the base substrate.

6. The display substrate according to claim 5, wherein a thickness of the first insulating layer is smaller than a thickness of at least a part of the defining portion.

7. The display substrate according to claim 5 or 6, wherein the first insulating layer includes at least two film layers, and a difference in thickness between different film layers is smaller than 1 micron.

8. The plurality of light-emitting elements includes light-emitting elements of at least two colors. The defining portion located between the openings corresponding to adjacent light-emitting elements of different colors includes a first sub-defining portion. The defining portion located between the openings corresponding to adjacent light-emitting elements of the same color includes a second sub-defining portion. The maximum thickness of the first sub-defining portion is greater than the maximum thickness of the second sub-defining portion, and / or the side surface of the first sub-defining portion away from the base substrate includes a first slope, and the side surface of the second sub-defining portion away from the base substrate includes a second slope. The slope angle of the first slope is greater than the slope angle of the second slope. The portion of the second electrode covering the second sub-defining portion is continuously provided. The display substrate according to any one of claims 1 to 7.

9. A signal transmission line located on the side of the first electrode facing the base substrate, Further including a transmission portion located on the side of the first electrode facing the base substrate and electrically connected to the signal transmission line, The display substrate includes a display area and a peripheral area surrounding the display area. The signal transmission line is located in the peripheral area. The transmission portion is located on the side close to the display area of the outermost edge portion of the defining portion, and the second electrode is electrically connected to the transmission portion. The display substrate according to claim 8.

10. The emission colors of at least two adjacent light-emitting elements arranged along a first direction are the same. The emission colors of at least two adjacent light-emitting elements arranged along a second direction are different. The first direction intersects the second direction. The defining portion includes a plurality of first sub-defining portions and a plurality of second sub-defining portions. At least one first sub-defining portion extends along the first direction, and a second sub-defining portion extending along the second direction is provided between two adjacent first sub-defining portions. The display substrate according to claim 8 or 9.

11. Further including an electrode contact portion located on the side of the defining portion facing the base substrate. Along the direction perpendicular to the base substrate, the defining portion overlaps the electrode contact portion. The defining portion includes an opening or a groove exposing the electrode contact portion. The second electrode is electrically connected to the electrode contact portion through the opening or the groove. The display substrate according to any one of claims 1 to 7.

12. The ratio between the maximum thickness of the defined portion between light-emitting elements with different emission colors and the maximum thickness of the defined portion between light-emitting elements with the same emission color is 0.8 to 1. The display substrate according to claim 11.

13. The extending direction of at least a part of the electrode contact portion is the same as the extending direction of at least a part of the defined portion. The display substrate according to claim 12.

14. Further including a signal transmission line located on the side of the first electrode facing the base substrate, The display substrate includes a display area and a peripheral area surrounding the display area. The signal transmission line is located in the peripheral area, and the second electrode is electrically connected to the signal transmission line through the electrode contact portion. The display substrate according to any one of claims 11 to 13.

15. The electrode contact portion includes at least one film layer installed in the same layer as the first electrode. The display substrate according to any one of claims 11 to 14.

16. The electrode contact portion includes multiple film layers, and the distance between the surface of the electrode contact portion on the side away from the base substrate and the base substrate is greater than the distance between the surface of the first electrode on the side away from the base substrate and the base substrate. The display substrate according to claim 15.

17. The electrode contact portion includes a film layer located on the side of the first electrode away from the base substrate. The display substrate according to any one of claims 11 to 15.

18. Further including a planarization layer located between the first electrode and the base substrate, The planarization layer includes a planarization layer convex portion, and the orthographic projection of the planarization layer convex portion on the base substrate and the orthographic projection of the electrode contact portion on the base substrate overlap such that the distance between the surface of the electrode contact portion on the side away from the base substrate and the base substrate is greater than the distance between the surface of the first electrode on the side away from the base substrate and the base substrate. The display substrate according to any one of claims 11 to 17.

19. Further including a planarization layer located between the first electrode and the base substrate, The planarization layer includes a concave groove, and along the direction perpendicular to the base substrate, the defined portion does not overlap with the concave groove. The first electrode and the light-emitting functional layer of at least some of the light-emitting elements are located in the concave groove, and at least a part of the surface of the light-emitting functional layer on the side away from the base substrate is closer to the base substrate than the surface of the electrode contact portion on the side away from the base substrate. The display substrate according to any one of claims 11 to 17.

20. The display substrate according to claim 19, further comprising a transparent compensation structure located between the light conversion layer and the bottom of the concave groove.

21. The side wall of the concave groove is installed obliquely, and the portion of the side wall away from the base substrate is farther from the center of the light-emitting region of the light-emitting element installed in the concave groove than the portion closer to the base substrate. The display substrate according to claim 19 or 20.

22. The defining portion includes the opening, the plurality of light-emitting elements include at least two different color light-emitting elements, and the opening is installed at least in the interval with the largest size among the intervals between the light-emitting regions of adjacent different color light-emitting elements and the intervals between adjacent same color light-emitting elements. The display substrate according to claim 11.

23. The display substrate further includes a separation structure located between the second electrode and the defining portion. Along the direction perpendicular to the base substrate, the separation structure overlaps with the defining portion, and the materials of the separation structure and the defining portion are different. Along the arrangement direction of adjacent light-emitting elements, in the separation structure located between the adjacent light-emitting elements, the edge of the separation structure protrudes with respect to the edge of the defining portion to form a protruding portion. The display substrate according to any one of claims 1 to 4.

24. The display substrate according to any one of claims 1 to 22, further comprising a spacer located on the surface of at least a part of the defining portion on the side away from the base substrate.

25. The defining portion includes a first defining portion and a second defining portion installed in layers, the first defining portion is located on the side closer to the base substrate of the second defining portion, and the surface of the light conversion layer closer to the base substrate is closer to the base substrate than at least a part of the surface of the second defining portion away from the base substrate. The display substrate according to any one of claims 1 to 4.

26. The first defining portion is in direct contact with the second defining portion, or The display substrate further includes a first insulating layer located between the light conversion layer and the second electrode, and the first insulating layer is installed between the first defining portion and the second defining portion. The display substrate according to claim 25.

27. The cross-section obtained by cutting along the plane in which the center connection line of the light-emitting regions of two adjacent light-emitting elements located on both sides of the defined portion lies is the defined portion cross-section. The shape of the defined portion cross-section includes a trapezoid or a stepped shape, and the plane is perpendicular to the base substrate. The display substrate according to claim 1.

28. The cross-section obtained by cutting along the plane in which the center connection line of the light-emitting regions of two adjacent light-emitting elements located on both sides of the defined portion lies is the defined portion cross-section. The size of the middle portion of the defined portion cross-section in the direction parallel to the base substrate is larger or smaller than the size of the two side portions in the direction parallel to the base substrate, and the plane is perpendicular to the base substrate. The display substrate according to claim 1.

29. The defined portion includes at least two layers of a stacked structure. The display substrate according to claim 1.

30. The light-emitting functional layer includes a thermally activated delayed fluorescence material. The display substrate according to claim 1.

31. The plurality of light-emitting elements include at least two-color light-emitting elements. The light-emitting functional layers of the at least two-color light-emitting elements are all configured to emit light of a first color. At least one color of the at least two-color light-emitting elements includes the light conversion layer, and the first color light is converted into second color light after passing through the light conversion layer. The display substrate according to claim 30.

32. A second insulating layer located on the side of the light conversion layer away from the base substrate, And a color filter layer located on the side of the second insulating layer away from the light conversion layer. The display substrate according to any one of claims 1 to 31.

33. The second insulating layer includes refractive particles. The display substrate according to claim 32.

34. A display substrate, A base substrate, A plurality of light-emitting elements located on the base substrate, including a light-emitting functional layer, a first electrode and a second electrode located on both sides of the light-emitting functional layer along a direction perpendicular to the base substrate. The first electrode is between the light-emitting functional layer and the base substrate and includes a plurality of light-emitting elements, A pixel definition pattern located on the side of the first electrode away from the base substrate, including a plurality of openings and a defined portion surrounding the plurality of openings. The light-emitting elements include a pixel definition pattern at least partially located within the openings. At least one light-emitting element further includes a light conversion layer, the light conversion layer is configured to emit light of another color after light of one color is incident on the light conversion layer, and the light conversion layer is located on a side away from the second electrode of the first electrode, a display substrate.

35. A display device, comprising the display substrate according to any one of claims 1 to 34, and a counter substrate installed to face the display substrate, wherein the counter substrate is located on the display side of the display substrate, a display device.

36. The display device according to claim 35, wherein a material layer installed at a position facing the light conversion layer on the side of the counter substrate facing the display substrate includes the same material as the material of the light conversion layer.

Images