Display substrate and display device

Abstract

A display substrate, comprising: a base, an organic isolation structure arranged on the base, and a plurality of light-emitting elements. The organic isolation structure comprises: a plurality of organic isolation columns, and at least one organic isolation column is located at an interval between light-emitting areas of at least two adjacent light-emitting elements emitting light of different colors. Each organic isolation column comprises a first isolation layer and a second isolation layer which are stacked. The first isolation layer comprises a first bottom surface and a first top surface, the second isolation layer comprises a second bottom surface and a second top surface, and the second bottom surface is in contact with the first top surface. The orthographic projection of the first top surface on the base covers the orthographic projection of the first bottom surface on the base, the orthographic projection of the second top surface on the base covers the orthographic projection of the second bottom surface on the base, and the orthographic projection of the first top surface on the base covers the orthographic projection of the second bottom surface on the base.

Description

Display substrate and display device

[0001] This application claims priority to the Chinese patent application filed on January 30, 2024, with application number 202410132193.X and invention name “Display Substrate and Display Device”, the contents of which should be understood as incorporated into this application by reference. Technical Field

[0002] This article relates to but is not limited to the field of display technology, and in particular to a display substrate and a display device. Background Art

[0003] Organic Light Emitting Diodes (OLEDs) are active light-emitting display devices with advantages such as self-luminescence, wide viewing angles, high contrast, low power consumption, and extremely fast response times. With the continuous advancement of display technology, display devices using OLEDs as light-emitting devices and thin-film transistors (TFTs) for signal control have become mainstream products in the display field. Summary of the Invention

[0004] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0005] Embodiments of the present application provide a display substrate and a display device.

[0006] In one aspect, this embodiment provides a display substrate comprising: a substrate, an organic isolation structure disposed on the substrate, and a plurality of light-emitting elements. The organic isolation structure comprises a plurality of organic spacer pillars, at least one of which is located between the light-emitting regions of at least two adjacent light-emitting elements emitting light of different colors. The at least one organic spacer pillar comprises a stacked first and second isolation layers, with the second isolation layer located on a side of the first isolation layer away from the substrate. The first isolation layer comprises a first bottom surface and a first top surface, with the first bottom surface located on a side of the first top surface closer to the substrate. The second isolation layer comprises a second bottom surface and a second top surface, with the second bottom surface located on a side of the second top surface closer to the substrate and in contact with the first top surface. The orthographic projection of the first top surface onto the substrate overlaps the orthographic projection of the first bottom surface onto the substrate, the orthographic projection of the second top surface onto the substrate overlaps the orthographic projection of the second bottom surface onto the substrate, and the orthographic projection of the first top surface onto the substrate overlaps the orthographic projection of the second bottom surface onto the substrate.

[0007] In some exemplary embodiments, the orthographic projection of the first top surface on the substrate includes the orthographic projection of the second top surface on the substrate.

[0008] In some exemplary embodiments, the light-emitting element includes: a light-emitting functional layer, the light-emitting functional layer including at least: two light-emitting layers, and at least one charge generation layer located between the two light-emitting layers; the light-emitting functional layer is located on the side of the organic isolation structure away from the substrate, and the orthographic projection of the light-emitting functional layer on the substrate at least partially overlaps with the orthographic projection of the organic isolation structure on the substrate.

[0009] In some exemplary embodiments, an orthographic projection of the at least one charge generation layer on the substrate covers an orthographic projection of the plurality of light emitting elements on the substrate.

[0010] In some exemplary embodiments, the light-emitting functional layers of adjacent light-emitting elements that emit light of different colors are separated by the organic spacer pillars.

[0011] In some exemplary embodiments, the light-emitting functional layer of the light-emitting element includes: a partition portion formed by partitioning the organic isolation column; a first gap is provided between the partition portion and the second isolation layer, and a surface of the partition portion facing the substrate is in contact with a first top surface of the first isolation layer; the display substrate further includes: a first encapsulation layer located on a side of the plurality of light-emitting elements away from the substrate, the first encapsulation layer being in contact with the first top surface.

[0012] In some exemplary embodiments, the light-emitting functional layer includes: a partition portion formed by the organic isolation column; the partition portion is in contact with the second isolation layer, and a surface of the partition portion facing the substrate is in contact with the first top surface of the first isolation layer.

[0013] In some exemplary embodiments, the light-emitting functional layer includes: a first hole transport layer, a first light-emitting layer, a first hole blocking layer, a first charge generating layer, a second charge generating layer, a second hole transport layer, a second light-emitting layer, a second hole blocking layer and an electron transport layer stacked in sequence.

[0014] In some exemplary embodiments, the first isolation layer and the second isolation layer of the at least one organic spacer are an integral structure connected to each other.

[0015] In some exemplary embodiments, the thickness of the first isolation layer is in a range of 0.2 micrometers to 1.1 micrometers, and the thickness of the second isolation layer is in a range of 1.2 micrometers to 1.6 micrometers.

[0016] In some exemplary embodiments, the light-emitting element includes: a stacked first electrode, a light-emitting functional layer, and a second electrode, the first electrode being located on a side of the second electrode closer to the substrate. The display substrate further includes: a pixel definition layer located on a side of the first electrode of the light-emitting element farther from the substrate, the pixel definition layer being provided with a pixel opening, the light-emitting functional layer contacting the first electrode through the pixel opening; and the organic isolation structure being located on a side of the pixel definition layer farther from the substrate. The orthographic projection of the pixel definition layer on the substrate overlaps the orthographic projection of the organic isolation structure on the substrate.

[0017] In some exemplary embodiments, the light-emitting element includes: a stacked first electrode, a light-emitting functional layer, and a second electrode, wherein the first electrode is located on a side of the second electrode closer to the substrate. The display substrate further includes: a pixel definition layer located on a side of the first electrode of the light-emitting element farther from the substrate, the pixel definition layer being provided with a pixel opening, and the light-emitting functional layer being in contact with the first electrode through the pixel opening. The orthographic projection of the pixel definition layer on the substrate does not overlap with the orthographic projection of the organic isolation structure on the substrate, or the orthographic projection of the pixel definition layer on the substrate partially overlaps with the orthographic projection of the organic isolation structure on the substrate.

[0018] In some exemplary embodiments, the pixel definition layer is provided with at least one first isolation groove, and the at least one organic isolation column of the organic isolation structure is provided in the at least one first isolation groove; the first isolation groove does not overlap with the orthographic projection of the substrate and the first electrode of the light-emitting element in the orthographic projection of the substrate; there is a second gap between the organic isolation column provided in the first isolation groove and the side wall of the first isolation groove; the light-emitting functional layer is in contact with the side wall of the first isolation groove.

[0019] In some exemplary embodiments, the pixel definition layer is provided with at least one first isolation groove, and the at least one organic isolation column of the organic isolation structure is arranged in the at least one first isolation groove; the orthographic projection of the first isolation groove on the substrate does not overlap with the orthographic projection of the first electrode of the light-emitting element on the substrate; the organic isolation column arranged in the first isolation groove is in direct contact with the side wall of the first isolation groove.

[0020] In some exemplary embodiments, at least two adjacent organic spacer pillars extending in the same direction are disposed between the light emitting regions of at least two adjacent light emitting elements emitting light of different colors.

[0021] In some exemplary embodiments, the display substrate further includes: a plurality of support columns, at least one of the plurality of support columns being located between light-emitting regions of two adjacent light-emitting elements that emit light of the same color; and a maximum height of the organic isolation column being less than or equal to a minimum height of the support column.

[0022] In some exemplary embodiments, a material of the support pillars is different from a material of the organic spacer pillars.

[0023] In some exemplary embodiments, the plurality of light-emitting elements include: a plurality of first light-emitting elements emitting a first color of light, a plurality of second light-emitting elements emitting a second color of light, and a plurality of third light-emitting elements emitting a third color of light; the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged in a row along a first direction, and the plurality of third light-emitting elements are arranged in a row along the first direction; the row of first and second light-emitting elements and the row of third light-emitting elements are arranged in a second direction, and the first direction intersects the second direction. The organic isolation structure includes: a plurality of organic spacer columns extending along the first direction and a plurality of organic spacer columns extending along the second direction; at least one organic spacer column extending along the second direction is provided between adjacent first and second light-emitting elements; and at least one organic spacer column extending along the first direction is provided between adjacent third light-emitting elements and the first and second light-emitting elements.

[0024] On the other hand, this embodiment provides a display device including the display substrate as described above.

[0025] On the other hand, this embodiment provides a method for preparing a display substrate, comprising: providing a substrate; forming an organic isolation structure and a plurality of light-emitting elements on the substrate. The organic isolation structure comprises: a plurality of organic isolation columns, at least one of the plurality of organic isolation columns being located between light-emitting regions of at least two adjacent light-emitting elements emitting light of different colors; the at least one organic isolation column comprising: a stacked first isolation layer and a second isolation layer, the second isolation layer being located on a side of the first isolation layer away from the substrate; the first isolation layer comprising: a first bottom surface and a first top surface, the first bottom surface being located on a side of the first top surface close to the substrate; the second isolation layer comprising: a second bottom surface and a second top surface, the second bottom surface being located on a side of the second top surface close to the substrate, and the second bottom surface being in contact with the first top surface; the orthographic projection of the first top surface on the substrate overlapping the orthographic projection of the first bottom surface on the substrate, the orthographic projection of the second top surface on the substrate overlapping the orthographic projection of the second bottom surface on the substrate, and the orthographic projection of the first top surface on the substrate overlapping the orthographic projection of the second bottom surface on the substrate.

[0026] In some exemplary embodiments, forming an organic isolation structure on the substrate includes one of the following: forming the organic isolation column using a halftone mask, wherein the first isolation layer and the second isolation layer of the organic isolation column are an interconnected integral structure; forming the first isolation layer of the organic isolation column using a first mask, and forming the second isolation layer of the organic isolation column using a second mask; sequentially forming the first isolation layer and the second isolation layer of the organic isolation column through two patterning processes using a third mask, wherein the exposure amounts of the two patterning processes are different.

[0027] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. Other advantages of the present application can be realized and obtained by the solutions described in the description and the drawings.

[0028] Summary of the Figures

[0029] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0030] FIG1 is a schematic diagram of a display substrate according to at least one embodiment of the present disclosure;

[0031] FIG2 is a partial enlarged schematic diagram of area A1 in FIG1 ;

[0032] FIG3 is a partial enlarged schematic diagram of area A2 in FIG2 ;

[0033] FIG4 is a schematic plan view of the anode layer in FIG3 ;

[0034] FIG5 is a schematic partial cross-sectional view along the Q1-Q1' direction in FIG3;

[0035] FIG6 is a partial enlarged schematic diagram of area A3 in FIG5 ;

[0036] FIG7 is a schematic diagram of preparing an organic isolation structure according to at least one embodiment of the present disclosure;

[0037] FIG8 is another schematic diagram of preparing an organic isolation structure according to at least one embodiment of the present disclosure;

[0038] FIG9 is another partial cross-sectional schematic diagram along the Q1-Q1' direction in FIG3;

[0039] FIG10 is another partial cross-sectional schematic diagram along the Q1-Q1' direction in FIG3;

[0040] FIG11 is another partial cross-sectional schematic diagram along the Q1-Q1' direction in FIG3;

[0041] FIG12 is another partial cross-sectional schematic diagram along the Q1-Q1' direction in FIG3;

[0042] FIG13 is another partial cross-sectional schematic diagram along the Q1-Q1' direction in FIG3;

[0043] FIG14 is another partially enlarged schematic diagram of area A1 in FIG1 ;

[0044] FIG15 is a partial enlarged schematic diagram of area A4 in FIG14 ;

[0045] FIG16 is a schematic partial cross-sectional view along the Q2-Q2' direction in FIG15;

[0046] FIG17 is another partially enlarged schematic diagram of area A1 in FIG1 ;

[0047] FIG18 is another partially enlarged schematic diagram of area A1 in FIG1 ;

[0048] FIG19 is another partially enlarged schematic diagram of area A1 in FIG1 ;

[0049] FIG20 is another partially enlarged schematic diagram of area A1 in FIG1 ;

[0050] FIG21 is another partially enlarged schematic diagram of area A1 in FIG1 ;

[0051] FIG. 22 is a schematic diagram of a display device according to at least one embodiment of the present disclosure.

[0052] Details

[0053] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments can be implemented in a variety of different forms. A person skilled in the art can easily understand that the method and content can be transformed into one or more forms without departing from the purpose and scope of the present application. Therefore, the present application should not be interpreted as being limited to the contents described in the following embodiments. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other in any way.

[0054] In the drawings, the size of one or more components, layer thicknesses, or regions may be exaggerated for clarity. Therefore, one embodiment of the present application is not necessarily limited to these dimensions, and the shapes and sizes of various components in the drawings do not reflect true proportions. Furthermore, the drawings schematically illustrate idealized examples, and one embodiment of the present application is not limited to the shapes or values ​​shown in the drawings.

[0055] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0056] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being referred to. Thus, a feature defined as "first," "second," etc., may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless expressly limited otherwise.

[0057] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, "connected" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the meanings of the above terms in this application can be understood according to the circumstances.

[0058] In this application, "electrically connected" includes components connected together via an element having some electrical function. There are no particular limitations on the "element having some electrical function" as long as it enables the transmission of electrical signals between the connected components. Examples of "element having some electrical function" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other components with one or more functions.

[0059] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", or "some examples" means that the features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0061] In this application, a transistor refers to an element that includes at least three terminals: a gate electrode, a drain electrode, and a source electrode. A transistor has a channel region between a drain electrode (drain electrode terminal, drain region, or drain electrode) and a source electrode (source electrode terminal, source region, or source electrode), and current can flow through the drain electrode, the channel region, and the source electrode. In this disclosure, the channel region refers to the region through which current primarily flows.

[0062] In this application, the first electrode may be a drain electrode and the second electrode may be a source electrode, or the first electrode may be a source electrode and the second electrode may be a drain electrode. The functions of the "source electrode" and "drain electrode" may be interchanged when using transistors with opposite polarities or when the direction of current changes during circuit operation. Therefore, in this disclosure, the terms "source electrode" and "drain electrode" may be interchanged.

[0063] In this application, "parallel" refers to a state where the angle formed by two straight lines is greater than -10° and less than 10°, and thus includes a state where the angle is greater than -5° and less than 5°. Furthermore, "perpendicular" refers to a state where the angle formed by two straight lines is greater than 80° and less than 100°, and thus includes a state where the angle is greater than 85° and less than 95°.

[0064] The terms “approximately” and “substantially” in this application refer to values ​​that are not strictly limited and allow for process and measurement errors.

[0065] In this specification, "A extends along direction B" means that A may include a main portion and a secondary portion connected to the main portion, the main portion being a line, line segment, or strip, extending along direction B, and the length of the main portion extending along direction B being greater than the length of the secondary portion extending along other directions. Throughout this specification, "A extends along direction B" means "the main portion of A extends along direction B."

[0066] As used herein, "A and B are in the same layer" or "A and B are disposed in the same layer" means that A and B are formed simultaneously through the same patterning process, or that the surfaces of A and B near the substrate are substantially the same distance from the substrate, or that the surfaces of A and B near the substrate are in direct contact with the same film layer. "Same layer" does not always mean that the thickness or height of the layer is the same in a cross-sectional view.

[0067] In this application, the "thickness" and "height" of a film layer refer to the dimensions of the film layer in a direction perpendicular to the display substrate. The "thickness" of a film layer refers to the vertical distance between the surface of the film layer facing away from the substrate and the surface of the film layer facing closer to the substrate. The "height" of a film layer refers to the vertical distance between the surface of the film layer facing away from the substrate and the substrate surface.

[0068] In this application, “the orthographic projection of A contains the orthographic projection of B” means that the boundary of the orthographic projection of B falls within the boundary of the orthographic projection of A, or the boundary of the orthographic projection of A coincides with the boundary of the orthographic projection of B. “The orthographic projection of A covers the orthographic projection of B” means that the boundary of the orthographic projection of B falls within the boundary of the orthographic projection of A.

[0069] The OLED light-emitting element includes: an anode (Anode), a light-emitting functional layer and a cathode (Cathode) stacked in sequence. Driven by the voltage of the anode and the cathode, the light-emitting characteristics of the organic material of the light-emitting functional layer are used to emit light according to the required grayscale. In order to reduce the process difficulty and improve the yield, some film layers in the light-emitting functional layer of the OLED light-emitting element will adopt a common layer design as the entire film layer. After research, the inventors found that when a film layer with a higher conductivity in the light-emitting functional layer is used as a common layer, it is easy to generate crosstalk between adjacent light-emitting elements. For example, a common layer with a higher conductivity (for example, a hole injection layer, etc.) can guide the leakage current of the light-emitting element that needs to emit light to the adjacent light-emitting element that does not need to emit light, causing the adjacent light-emitting element that does not need to emit light to be slightly bright, resulting in poor crosstalk. Moreover, at low grayscale, the brightness deviation caused by the crosstalk current will be more obvious, resulting in the inability to accurately display the required color, seriously affecting the color accuracy of the display product at low grayscale. For example, since the driving voltage of the blue light-emitting element is relatively large, the blue light-emitting element easily causes the red light-emitting element and the green light-emitting element to light up in a low grayscale monochrome display situation, resulting in color mixing.

[0070] The present embodiment provides a display substrate and a display device, which can improve display defects caused by crosstalk between adjacent light-emitting elements, thereby improving display effects.

[0071] This embodiment provides a display substrate, comprising: a substrate, an organic isolation structure disposed on the substrate, and a plurality of light-emitting elements. The organic isolation structure includes a plurality of organic spacer pillars, at least one of which is located between the light-emitting regions of at least two adjacent light-emitting elements emitting light of different colors. At least one organic spacer pillar includes a stacked first and second isolation layers, the second isolation layer being located on the side of the first isolation layer away from the substrate, with the orthographic projection of the first isolation layer on the substrate overlapping the orthographic projection of the second isolation layer on the substrate. The first isolation layer includes a first bottom surface and a first top surface, the first bottom surface being located on the side of the first top surface closer to the substrate. The second isolation layer includes a second bottom surface and a second top surface, the second bottom surface being located on the side of the second top surface closer to the substrate, and the second bottom surface contacting the first top surface. The orthographic projection of the first top surface on the substrate overlaps the orthographic projection of the first bottom surface on the substrate, the orthographic projection of the second top surface on the substrate overlaps the orthographic projection of the second bottom surface on the substrate, and the orthographic projection of the first top surface on the substrate overlaps the orthographic projection of the second bottom surface on the substrate.

[0072] In some examples, the first top surface of the first isolation layer may be larger than the first bottom surface. The orthographic projection of the first bottom surface on the substrate may be within the orthographic projection of the first top surface on the substrate. For example, in a plane perpendicular to the extension direction of the organic isolation pillars and perpendicular to the substrate, the cross-sectional shape of the first isolation layer may be approximately an inverted trapezoid, such as an inverted isosceles trapezoid.

[0073] In some examples, the second top surface of the second isolation layer can be larger than the second bottom surface. The orthographic projection of the second bottom surface on the substrate can be within the orthographic projection of the second top surface on the substrate. For example, in a plane perpendicular to the extension direction of the organic isolation pillars and perpendicular to the substrate, the cross-sectional shape of the second isolation layer can be approximately an inverted trapezoid, such as an inverted isosceles trapezoid.

[0074] In some examples, the first top surface of the first isolation layer can be larger than the second bottom surface of the second isolation layer. The orthographic projection of the second bottom surface on the substrate can be within the orthographic projection of the first top surface on the substrate. The first isolation layer and the second isolation layer can be stacked to form a double inverted trapezoidal stacking structure.

[0075] The display substrate provided in this embodiment uses an organic isolation column including two isolation layers, and the cross-section of the isolation layer is an inverted trapezoidal design, which can extend or isolate the leakage current path between adjacent light-emitting elements emitting light of different colors, thereby improving the display defects caused by crosstalk between adjacent light-emitting elements emitting light of different colors and improving the display effect.

[0076] In some exemplary embodiments, the orthographic projection of the first top surface on the substrate may include the orthographic projection of the second top surface on the substrate. In some examples, the size of the first top surface may be larger than the size of the second top surface and the second bottom surface, and the orthographic projections of the second top surface and the second bottom surface on the substrate may be located within the orthographic projection of the first top surface on the substrate. In other examples, the size of the first top surface may be the same as the size of the second top surface and larger than the size of the second bottom surface. The orthographic projection of the second bottom surface on the substrate may be located within the orthographic projection of the first top surface on the substrate, and the orthographic projection of the first top surface on the substrate and the orthographic projection of the second top surface on the substrate may overlap. In other examples, the size of the first top surface may be smaller than the size of the second top surface and larger than the size of the second bottom surface. The orthographic projection of the second bottom surface on the substrate may be located within the orthographic projection of the first top surface on the substrate, and the orthographic projection of the first top surface on the substrate may be located within the orthographic projection of the second top surface on the substrate. For example, in a plane perpendicular to the extension direction of the organic spacer and perpendicular to the substrate, the cross-sectional shape of the organic spacer can be a stacked structure of a smaller inverted trapezoid stacked on a larger inverted trapezoid; or, the cross-sectional shape of the organic spacer can be a stacked structure of two inverted trapezoids of the same size; or, the cross-sectional shape of the organic spacer can be a stacked structure of a larger inverted trapezoid stacked on a smaller inverted trapezoid. This embodiment is not limited to this.

[0077] In some exemplary embodiments, a light-emitting element may include a light-emitting functional layer, the light-emitting functional layer including at least two light-emitting layers and at least one charge generation layer located between the two light-emitting layers. The light-emitting functional layer is located on the side of the organic isolation structure away from the substrate, and the orthographic projection of the light-emitting functional layer on the substrate at least partially overlaps with the orthographic projection of the organic isolation structure on the substrate. For example, the orthographic projection of the light-emitting functional layer on the substrate may cover the orthographic projection of the organic isolation structure on the substrate, or the orthographic projection of the light-emitting functional layer on the substrate may partially overlap with the orthographic projection of the organic isolation structure on the substrate. In some examples, the light-emitting functional layer may include: a first hole transport layer, a first light-emitting layer, a first hole blocking layer, a first charge generation layer, a second charge generation layer, a second hole transport layer, a second light-emitting layer, a second hole blocking layer, and an electron transport layer stacked in sequence. In this example, the light-emitting element may adopt a tandem structure design, using the charge generation layer as a heterogeneous layer and connecting the two light-emitting layers in series. This can greatly reduce the light-emitting current of the light-emitting element at the same light-emitting intensity, thereby improving the power consumption and life of the display product and meeting the brightness requirements of the user.

[0078] In some exemplary embodiments, the orthographic projection of at least one charge generation layer on the substrate may overlap the orthographic projections of multiple light-emitting elements on the substrate. Because the charge generation layer has a high conductivity and the charge generation layers of adjacent light-emitting elements are continuous layers, crosstalk between adjacent light-emitting elements can easily occur. In this example, organic spacers are provided between adjacent light-emitting elements that emit light of different colors. These spacers can isolate or extend the leakage current path between adjacent light-emitting elements, thereby reducing leakage current between adjacent light-emitting elements that emit light of different colors and improving display defects caused by crosstalk.

[0079] In some exemplary embodiments, the light-emitting functional layers of adjacent light-emitting elements that emit light of different colors may be separated by organic spacers. In this example, organic spacers disposed between adjacent light-emitting elements that emit light of different colors can be used to isolate leakage current paths between the adjacent light-emitting elements, thereby reducing leakage current between the adjacent light-emitting elements and improving display defects caused by crosstalk.

[0080] In some exemplary embodiments, the light-emitting functional layer may include: a partition portion formed by partitioning by an organic isolation column. A first gap may be provided between the partition portion and the second isolation layer, and the surface of the partition portion facing the substrate may be in contact with the first top surface of the first isolation layer. The display substrate may further include: a first encapsulation layer located on the side of the plurality of light-emitting elements away from the substrate, and the first encapsulation layer may be in contact with the first top surface exposed by the first gap. For example, the first encapsulation layer may fill the first gap. In this example, the toughness of the display substrate may be enhanced and the film peeling of the display substrate may be prevented by forming a first gap between the partition portion and the second isolation layer and filling the first gap with the first encapsulation layer. In other examples, the partition portion may be in contact with the second isolation layer, and the surface of the partition portion facing the substrate may be in contact with the first top surface of the first isolation layer.

[0081] In some exemplary embodiments, the first and second isolation layers of at least one organic spacer column may be interconnected and integrally formed. In some examples, the first and second isolation layers of the organic spacer column may be formed using a single patterning process, simplifying the manufacturing process. However, this embodiment is not limited to this. In other examples, the first and second isolation layers of the organic spacer column may be formed using two patterning processes.

[0082] In some exemplary embodiments, the thickness of the first isolation layer may be less than the thickness of the second isolation layer. In some examples, the thickness of the first isolation layer may range from 0.2 microns to 1.1 microns, and the thickness of the second isolation layer may range from 1.2 microns to 1.6 microns. In this example, by setting the thickness of the second isolation layer to be greater than the thickness of the first isolation layer, the second isolation layer can be used to cut off the leakage current path between adjacent light-emitting elements.

[0083] In some exemplary embodiments, the light-emitting element may include: a stacked first electrode, a light-emitting functional layer, and a second electrode, and the first electrode may be located on a side of the second electrode close to the substrate. For example, the first electrode may be an anode, and the second electrode may be a cathode. The display substrate may further include: a pixel definition layer located on a side of the first electrode of the light-emitting element away from the substrate, the pixel definition layer may be provided with a pixel opening, and the light-emitting functional layer may be in contact with the first electrode through the pixel opening. The organic isolation structure may be located on a side of the pixel definition layer away from the substrate. The orthographic projection of the pixel definition layer on the substrate may cover the orthographic projection of the organic isolation structure on the substrate. In this example, the organic isolation structure may be provided on the pixel definition layer.

[0084] In some exemplary embodiments, the orthographic projection of the pixel definition layer on the substrate may not overlap with the orthographic projection of the organic isolation structure on the substrate, or the orthographic projection of the pixel definition layer on the substrate may partially overlap with the orthographic projection of the organic isolation structure on the substrate. In this example, by removing or thinning the pixel definition layer below the organic isolation structure, the height of the organic isolation structure can be reduced, thereby avoiding scratches between the fine metal mask (FMM) and the organic isolation structure. Moreover, the leakage current path between adjacent light-emitting elements emitting light of different colors can be further increased, thereby improving the crosstalk between adjacent light-emitting elements emitting light of different colors.

[0085] In some exemplary embodiments, the pixel definition layer may be provided with at least one first isolation groove, and at least one organic isolation column of the organic isolation structure may be provided in the at least one first isolation groove. The orthographic projection of the first isolation groove on the substrate does not overlap with the orthographic projection of the first electrode of the light-emitting element on the substrate. A second gap may be provided between the organic isolation column provided in the first isolation groove and the sidewall of the first isolation groove; the light-emitting functional layer may be in contact with the sidewall of the first isolation groove, for example, the light-emitting functional layer may be filled in the second gap. In this example, by forming a second gap between the organic isolation column and the sidewall of the first isolation groove, the leakage current path between adjacent light-emitting elements emitting light of different colors can be further increased, thereby improving the crosstalk between adjacent light-emitting elements emitting light of different colors. In other examples, the organic isolation column provided in the first isolation groove may be in direct contact with the sidewall of the first isolation groove.

[0086] In some exemplary embodiments, at least two adjacent organic spacer pillars extending in the same direction may be provided between the light-emitting regions of at least two adjacent light-emitting elements emitting light of different colors. By providing at least two organic spacer pillars between adjacent light-emitting elements emitting light of different colors, this example further extends the leakage current path between adjacent light-emitting elements, further improving display defects caused by crosstalk between adjacent light-emitting elements emitting light of different colors, and thereby enhancing the display quality.

[0087] In some exemplary embodiments, the display substrate may further include: a plurality of support columns, at least one of the plurality of support columns may be located between the light-emitting areas of two adjacent light-emitting elements that emit light of the same color. The maximum height of the organic isolation column may be less than or equal to the minimum height of the support column. In some examples, the material of the support column may be different from the material of the organic isolation column. For example, the material of the support column may be the same as the material of the pixel definition layer and different from the material of the organic isolation column. The support column of this example is configured to support the FMM. By setting the height of the organic isolation column to be lower than the height of the support column, it is possible to avoid scratches between the FMM and the organic isolation column, thereby avoiding poor display of dark spots.

[0088] The solution of this embodiment is illustrated below through some examples.

[0089] Figure 1 is a schematic diagram of a display substrate of at least one embodiment of the present disclosure. In some examples, as shown in Figure 1, the display substrate of this embodiment may include: a display area AA and a border area BB located around the display area AA. The border area BB may surround the display area AA, for example, including an upper border, a lower border, a left border, and a right border. The display area AA may be provided with at least a plurality of pixel units, and each pixel unit may include a plurality of sub-pixels, such as three or four sub-pixels. At least one sub-pixel may include: a light-emitting element and a pixel circuit that drives the light-emitting element to emit light. In some examples, the size of the display substrate may be a micro display size, a small or medium size, or a large size. This example does not limit the size and resolution of the display substrate.

[0090] Figure 2 is a partially enlarged schematic diagram of area A1 in Figure 1. Figure 3 is a partially enlarged schematic diagram of area A2 in Figure 2. Figure 4 is a planar schematic diagram of the anode layer in Figure 3. In some examples, as shown in Figures 2 and 3, on a plane parallel to the display substrate, the multiple sub-pixels in display area AA may include: a plurality of first sub-pixels P1 emitting a first color light, a plurality of second sub-pixels P2 emitting a second color light, and a plurality of third sub-pixels P3 emitting a third color light. The first sub-pixel P1 may include a first light-emitting element 21a emitting the first color light, the second sub-pixel P2 may include a second light-emitting element 21b emitting the second color light, and the third sub-pixel P3 may include a third light-emitting element 21c emitting the third color light.

[0091] In some examples, the first color light may be green, the second color light may be red, and the third color light may be blue. The first light emitting element 21a may be a green light emitting element, the second light emitting element 21b may be a red light emitting element, and the third light emitting element c may be a blue light emitting element. However, this embodiment is not limited to this.

[0092] In some examples, as shown in Figures 2 and 3, a pixel unit in display area AA may include: a first subpixel P1, a second subpixel P2, and a third subpixel P3. In a pixel unit, the first light-emitting element 21a of the first subpixel P1 and the second light-emitting element 21b of the second subpixel P2 may be aligned along the first direction X, and the third light-emitting element 21c of the third subpixel P3 may be located on the same side of the first light-emitting element 21a and the second light-emitting element 21b in the second direction Y. Multiple pixel units in display area AA may be arranged in an array along the first direction X and the second direction Y, such that the first light-emitting elements 21a of the first subpixels P1 and the second light-emitting elements 21b of the second subpixels P2 are arranged in a row along the first direction X, and the third light-emitting elements 21c of the third subpixels P3 are arranged in a row along the first direction X. The row of third light-emitting elements 21c and the row of light-emitting elements including the first light-emitting elements 21a and the second light-emitting elements 21b may be arranged in the second direction Y. The multiple third light-emitting elements 21c may be aligned in the second direction Y.

[0093] In some examples, as shown in Figures 2 to 4, the first light-emitting element 21a can include a first anode 211a, the second light-emitting element 21b can include a second anode 211b, and the third light-emitting element 21c can include a third anode 211c. The orthographic projections of the first anode 211a, the second anode 211b, and the third anode 211c onto the substrate can all be substantially rectangular. The first anode 211a can be integrally connected to the first anode connecting electrode 214a. The first anode connecting electrode 214a can be connected to a pixel circuit that drives the first light-emitting element 21a to emit light. The first anode connecting electrode 214a can be located on a side of the first anode 211a proximal to the third anode 211c. The second anode 211b can be integrally connected to the second anode connecting electrode 214b. The second anode connecting electrode 214b can be connected to a pixel circuit that drives the second light-emitting element 21b to emit light. The second anode connecting electrode 214b can be located on a side of the second anode 211b proximal to the third anode 211c. The third anode 211c can be connected to the third anode connecting electrode 214c as an integral structure. The third anode connecting electrode 214c can be connected to the pixel circuit that drives the third light-emitting element 21c to emit light. The third anode connecting electrode 214c can be located on one side of the third anode 211c in the first direction X and adjacent to the second anode 211b in the second direction Y. This embodiment is not limited to this.

[0094] In some examples, as shown in Figures 2 and 3, the first light-emitting element 21a may include a first light-emitting region 210a, the second light-emitting element 21b may include a second light-emitting region 210b, and the third light-emitting element 21c may include a third light-emitting region 210c. The orthographic projections of the first light-emitting region 210a, the second light-emitting region 210b, and the third light-emitting region 210c on the substrate may be substantially rectangular. The area of ​​the first light-emitting region 210a may be smaller than that of the second light-emitting region 210b, and the area of ​​the second light-emitting region 210b may be smaller than that of the third light-emitting region 210c. The orthographic projection of the first light-emitting region 210a on the substrate may be located within the orthographic projection of the first anode 211a on the substrate, the orthographic projection of the second light-emitting region 210b on the substrate may be located within the orthographic projection of the second anode 211b on the substrate, and the orthographic projection of the third light-emitting region 210c on the substrate may be located within the orthographic projection of the third anode 211c on the substrate.

[0095] In some examples, as shown in Figures 2 and 3, the display area AA may further include an organic isolation structure 31 on a plane parallel to the display substrate. The organic isolation structure 31 may include a plurality of organic spacer columns 311a and 311b. The plurality of organic spacer columns 311a and 311b may be independently arranged. The extension direction of the organic spacer columns 311a and the extension direction of the organic spacer columns 311b may intersect, for example, may be perpendicular to each other. For example, the organic spacer columns 311a may extend along the second direction Y, and the organic spacer columns 311b may extend along the first direction X. The orthographic projection of the organic spacer columns 311a onto the substrate may be approximately strip-shaped extending along the second direction Y, and the orthographic projection of the organic spacer columns 311b onto the substrate may be approximately strip-shaped extending along the first direction X. However, this embodiment is not limited to this. In other examples, some of the organic spacer columns 311a and 311b of the organic isolation structure 31 may be interconnected and integrally formed.

[0096] In some examples, as shown in Figures 2 and 3, the organic spacer column 311a can be located in the interval between the first light-emitting region 210a of the first light-emitting element 21a and the second light-emitting region 210b of the adjacent second light-emitting element 21b. For example, an organic spacer column 311a can be provided between each first light-emitting region 210a of the first light-emitting element 21a and the second light-emitting region 210b of the second light-emitting element 21b. The orthographic projection of the organic spacer column 311a on the substrate may not overlap with the orthographic projection of the first light-emitting region 210a of the first light-emitting element 21a and the second light-emitting region 210b of the second light-emitting element 21b on the substrate. The orthographic projection of the organic spacer column 311a on the substrate may not overlap with the orthographic projection of the first anode 211a of the first light-emitting element 21a and the second anode 211b of the second light-emitting element 21b on the substrate. However, this embodiment is not limited to this. For example, the orthographic projection of the organic isolation column 311a on the substrate may overlap with the orthographic projection of the first anode 211a of the first light-emitting element 21a and the second anode 211b of the second light-emitting element 21b on the substrate, and has no overlap with the orthographic projection of the first light-emitting region 210a and the second light-emitting region 210b on the substrate.

[0097] In some examples, as shown in Figures 2 and 3, the organic spacer column 311b can be located between the third light-emitting region 210c of the third light-emitting element 21c and the first light-emitting region 210a of the adjacent first light-emitting element 21a and the second light-emitting region 210b of the adjacent second light-emitting element 21b. The orthographic projection of the organic spacer column 311b on the substrate does not overlap with the orthographic projections of the first light-emitting region 210a, the second light-emitting region 210b, and the third light-emitting region 210c on the substrate. The orthographic projection of the organic spacer column 311b on the substrate may not overlap with the orthographic projection of the third anode 211c of the third light-emitting element 21c on the substrate. The orthographic projection of the organic spacer column 311b on the substrate may partially overlap with the orthographic projections of the first anode connecting electrode 214a and the second anode connecting electrode 214b on the substrate, and does not overlap with the orthographic projection of the third anode connecting electrode 214c on the substrate. However, this embodiment is not limited to this. In some other examples, the orthographic projection of the organic spacer 311 b on the substrate may partially overlap with the orthographic projection of the third anode connection electrode 214 c on the substrate.

[0098] In some examples, as shown in Figures 2 and 3, the length of the organic spacer column 311a along the second direction Y can be less than or equal to the length of the first anode 211a of the first light-emitting element 21a along the second direction Y. The length of the first anode 211a of the first light-emitting element 21a along the second direction Y can be approximately the same as the length of the second anode 211b of the second light-emitting element 21b along the second direction Y. The length of the organic spacer column 311b along the first direction X can be greater than the length of the third anode 211c of the third light-emitting element 21c along the first direction X. The length of the organic spacer column 311b along the first direction X can be greater than or equal to the sum of the length of the first anode 211a of the first light-emitting element 21a along the first direction X and the length of the second anode 211b of the second light-emitting element 21b along the first direction X. However, this embodiment is not limited to this.

[0099] In some examples, as shown in Figures 2 and 3, the organic spacer 311a may include: a first spacer layer 3111 and a second spacer layer 3112 stacked together. The second spacer layer 3112 may be located on a side of the first spacer layer 3111 away from the substrate. The orthographic projection of the second spacer layer 3112 on the substrate may be located within the orthographic projection of the first spacer layer 3111 on the substrate. In other words, the orthographic projection of the first spacer layer 3111 on the substrate may cover the orthographic projection of the second spacer layer 3112 on the substrate. The length of the first spacer layer 3111 of the organic spacer 311a (e.g., the length along the second direction Y) may be greater than the length of the second spacer layer 3112, and the width of the first spacer layer 3111 (e.g., the length along the first direction X) may be greater than the width of the second spacer layer 3112. The structure of the organic spacer 311b is similar to that of the organic spacer 311a and will not be further described herein. However, this embodiment is not limited to this. In other examples, the orthographic projection of the first isolation layer 3111 on the substrate may coincide with the orthographic projection of the second isolation layer 3112 on the substrate, or the orthographic projection of the second isolation layer 3112 on the substrate may cover the orthographic projection of the first isolation layer 3111 on the substrate.

[0100] In some examples, as shown in Figures 2 and 3, on a plane parallel to the display substrate, the display area AA may further include: a plurality of support columns 41. The plurality of support columns 41 may be independently arranged. The orthographic projection of the support column 41 on the substrate may be roughly rectangular. The plurality of support columns 41 may be configured to support the FMM during the evaporation process. The support columns 41 may be arranged in the intervals between adjacent first light-emitting elements 21c. For example, in each row of third light-emitting elements 21c, one support column 41 may be provided between two third light-emitting elements 21c. Three rows of light-emitting elements (including a row of third light-emitting elements, and two rows of light-emitting elements including first light-emitting elements and second light-emitting elements) may be spaced between two adjacent support columns 41 aligned in the second direction Y. However, this embodiment does not limit the location of the support columns.

[0101] FIG5 is a schematic diagram of a partial cross-section along the Q1-Q1' direction in FIG3. The cross-sectional structure of the organic isolation column 311a is used as an example for explanation below. In some examples, as shown in FIG5, in a direction perpendicular to the display substrate, the display area may include: a substrate 10, and a circuit structure layer 11, a light-emitting structure layer, an organic isolation structure, and an encapsulation structure layer arranged on the substrate 10. The circuit structure layer 11 may include a plurality of pixel circuits, and the light-emitting structure layer may include a plurality of light-emitting elements. At least one pixel circuit may be connected to at least one light-emitting element. For example, a plurality of pixel circuits may be electrically connected to a plurality of light-emitting elements in a one-to-one correspondence, or a pixel circuit may be electrically connected to a plurality of light-emitting elements, or a plurality of pixel circuits may be electrically connected to the same light-emitting element. However, this embodiment is not limited to this.

[0102] In some examples, the pixel circuit may include multiple transistors and at least one storage capacitor. For example, the circuit structure layer 11 may include: a semiconductor layer, a first gate insulating layer, a first gate metal layer, a second gate insulating layer, a second gate metal layer, an interlayer insulating layer, a first source-drain metal layer, a passivation layer, a first flat layer, a second source-drain metal layer, and a second flat layer, provided on the substrate. The semiconductor layer may include: an active layer of multiple transistors of the pixel circuit, the first gate metal layer may include: gates of multiple transistors and a first electrode of the storage capacitor, the second gate metal layer may include: a second electrode of the storage capacitor, the first source-drain metal layer may include: sources and drains of multiple transistors, and the second source-drain metal layer may include: multiple connection electrodes connected to the anode layer. However, this embodiment is not limited to this. In other examples, the circuit structure layer may include: a first semiconductor layer, a first gate insulating layer, a first gate metal layer, a second gate insulating layer, a second gate metal layer, a third gate insulating layer, a second semiconductor layer, a fourth gate insulating layer, a third gate metal layer, an interlayer insulating layer, a first source-drain metal layer, a passivation layer, a first flat layer, a second source-drain metal layer, and a second flat layer, provided on the substrate. In other examples, the circuit structure layer may include: a first semiconductor layer, a first gate insulation layer, a first gate metal layer, a second gate insulation layer, a second gate metal layer, a third gate insulation layer, a second semiconductor layer, a fourth gate insulation layer, a third gate metal layer, an interlayer insulation layer, a first source-drain metal layer, a passivation layer, a first planarizing layer, a second source-drain metal layer, a second planarizing layer, a third source-drain metal layer, and a third planarizing layer arranged on a substrate.

[0103] In some examples, as shown in FIG5 , in a direction perpendicular to the display substrate, the light emitting structure layer may include: an anode layer, a pixel definition layer 24, a light emitting functional layer, and a cathode layer. The anode layer may include: anodes of multiple light emitting elements (e.g., a first anode 211a of a first light emitting element 21a, a second anode 211b of a second light emitting element 21b), and multiple anode connection electrodes (e.g., a first anode connection electrode 214a, a second anode connection electrode 214b, and a third anode connection electrode 214c shown in FIG4 ).

[0104] In some examples, as shown in FIG5 , the pixel definition layer 24 may have a plurality of pixel openings (e.g., a first pixel opening K1, a second pixel opening K2, and a third pixel opening). The pixel definition layer 24 within the first pixel opening K1 may be removed to expose a portion of the surface of the first anode 211 a. The pixel definition layer 24 within the second pixel opening K2 may be removed to expose a portion of the surface of the second anode 211 b. The pixel definition layer within the third pixel opening may be removed to expose a portion of the surface of the third anode 211 c.

[0105] In some examples, as shown in FIG5 , the light-emitting functional layer may include: a light-emitting functional layer 213a of a first light-emitting element 21a, a light-emitting functional layer 213b of a second light-emitting element 21b, and a light-emitting functional layer of a third light-emitting element 21c. The light-emitting functional layer located in the light-emitting region of the light-emitting element may contact the corresponding anode of the anode layer through a pixel opening. The light-emitting functional layers of adjacent light-emitting elements emitting light of different colors are separated by organic spacer columns. For example, the light-emitting functional layer 213a of the first light-emitting element 21a and the light-emitting functional layer 213b of the second light-emitting element 21b are separated by organic spacer columns 311a, so that the light-emitting functional layer 213a and the light-emitting functional layer 213b respectively form a partition portion 2131, and an inactive functional layer 213d is formed between the light-emitting functional layers 213a and 213b. The partition portion 2131 may include: a surface facing the substrate, a surface facing away from the substrate, and a side surface connected between the surface facing the substrate and the surface facing away from the substrate. The substrate-facing surface of the partition portion 2131 may be in contact with the first isolation layer 3111, and its orthographic projection onto the substrate may partially overlap with the orthographic projection of the first isolation layer 3111 of the organic isolation pillar 311a, and may not overlap with the orthographic projection of the second isolation layer 3112. A first gap F1 may be defined between the side surface of the partition portion 2131 and the second isolation layer 3112. The inactive functional layer 213d may be in contact with the second isolation layer 3112, and its orthographic projection onto the substrate may at least partially overlap with the orthographic projection of the second isolation layer 3112.

[0106] In some examples, as shown in FIG5 , the cathode layer may include cathodes of multiple light-emitting elements (e.g., cathode 212a of first light-emitting element 21a, cathode 212b of second light-emitting element 21b, and cathode 213 of third light-emitting element). The cathode layer is located on the side of the light-emitting functional layer away from the substrate and may be in direct contact with the light-emitting functional layer. The cathodes of adjacent light-emitting elements emitting light of different colors may be separated by organic spacers. For example, an inactive cathode block 212d may be provided between cathode 212a of first light-emitting element 21a and cathode 212b of second light-emitting element 21b. The inactive cathode block 212 may be in contact with the inactive functional layer 213d, and its orthographic projection on the substrate may at least partially overlap with the orthographic projection of the second isolation layer 3112 on the substrate. The orthographic projection of the cathode 212a of first light-emitting element 21a and cathode 212b of second light-emitting element 21b on the substrate may partially overlap with the orthographic projection of the first isolation layer 3111 on the substrate. In this example, the light-emitting area of ​​the light-emitting element may refer to an overlapping area of ​​the anode, the light-emitting functional layer, and the cathode of the light-emitting element corresponding to the pixel opening.

[0107] In some examples, as shown in FIG5 , the organic spacer columns 311 a may be located on a surface of the pixel definition layer 24 that is away from the substrate 10. The orthographic projection of the organic spacer columns 311 a on the substrate may be within the orthographic projection of the pixel definition layer 24 on the substrate. In other words, the orthographic projection of the pixel definition layer 24 on the substrate may overlap the orthographic projection of the organic spacer columns 311 a on the substrate. The orthographic projection of the first spacer layer 3111 of the organic spacer columns 311 a on the substrate may overlap the orthographic projection of the second spacer layer 3112 on the substrate.

[0108] In some examples, as shown in FIG5 , the first isolation layer 3111 of the organic spacer column 311a may include a first bottom surface 321, a first top surface 322, a first side surface 331 connecting the first bottom surface 321 and the first top surface 322, and a second side surface 332. The first bottom surface 321 is located on the side of the first top surface 322 closer to the substrate 10, and the first side surface 331 may face the second side surface 332. In a plane perpendicular to the extension direction of the organic spacer column 311a and perpendicular to the substrate, the cross-sectional shape of the first isolation layer 3111 may be approximately an inverted trapezoid, such as an inverted isosceles trapezoid. The dimensions of the first top surface 322 may be larger than those of the first bottom surface 321. The orthographic projection of the first top surface 322 on the substrate may overlap the orthographic projection of the first bottom surface 321 on the substrate. For example, the orthographic projections of the first top surface 322 and the first bottom surface 321 on the substrate may be rectangles of different sizes. The length of the orthographic projection of the first top surface 322 on the substrate may be greater than the length of the orthographic projection of the first bottom surface 321 on the substrate, and the width of the orthographic projection of the first top surface 322 on the substrate may be greater than the width of the orthographic projection of the first bottom surface 321 on the substrate.

[0109] In some examples, as shown in FIG5 , a first angle a1 may be formed between the first side surface 331 and the first top surface 322, and a second angle a2 may be formed between the second side surface 332 and the first top surface 322. The first angle a1 and the second angle a2 may be substantially the same. For example, the first angle a1 and the second angle a2 may be greater than or equal to 55 degrees and less than or equal to 75 degrees, or, for example, greater than or equal to 60 degrees and less than or equal to 70 degrees. However, this embodiment is not limited to this. In other examples, the first angle a1 may be different from the second angle a2.

[0110] In some examples, as shown in FIG5 , the second isolation layer 3112 of the organic spacer column 311a may include a second bottom surface 323, a second top surface 324, a third side surface 333 connecting the second bottom surface 331 and the second top surface 332, and a fourth side surface 334. The second bottom surface 323 is located on the side of the second top surface 324 closer to the substrate 10, and the third side surface 333 may face the fourth side surface 334. The second bottom surface 323 is in direct contact with the first top surface 322. In a plane perpendicular to the extension direction of the organic spacer column 311a and perpendicular to the substrate, the cross-sectional shape of the second isolation layer 3112 may be approximately an inverted trapezoid, for example, an inverted isosceles trapezoid. The second top surface 324 may be larger than the second bottom surface 323, smaller than the first top surface 322, and larger than the second top surface 324. The orthographic projection of the first top surface 322 on the substrate may overlap the orthographic projections of the second bottom surface 323 and the second top surface 324 on the substrate, and the orthographic projection of the second top surface 324 on the substrate may overlap the orthographic projection of the second bottom surface 323 on the substrate. In other words, the bottom dimension of the first isolation layer 3111 may be smaller than the top dimension, the bottom dimension of the second isolation layer 3112 may be smaller than the top dimension, and the top dimension of the first isolation layer 3111 may be larger than both the bottom and top dimensions of the second isolation layer 3112. For example, the orthographic projections of the second top surface 324, the second bottom surface 323, and the first top surface 322 on the substrate may be rectangles of different sizes. The length of the orthographic projection of the first top surface 322 onto the substrate can be greater than the length of the orthographic projection of the second top surface 324 onto the substrate, and can also be greater than the length of the orthographic projection of the second bottom surface 323 onto the substrate. The length of the orthographic projection of the second top surface 324 onto the substrate can be greater than the length of the orthographic projection of the second bottom surface 323 onto the substrate. The width of the orthographic projection of the first top surface 322 onto the substrate can be greater than the width of the orthographic projection of the second top surface 324 onto the substrate, and can also be greater than the width of the orthographic projection of the second bottom surface 323 onto the substrate. The width of the orthographic projection of the second top surface 324 onto the substrate can be greater than the width of the orthographic projection of the second bottom surface 323 onto the substrate. The portion of the first top surface 323 of the first isolation layer 3111 that is not in contact with the second bottom surface 323 of the second isolation layer 3112 can form a stepped surface and contact the surface of the partition portion 2131 of the light-emitting functional layer of the adjacent light-emitting element facing the substrate. The surface of the partition portion 2131 of the light-emitting functional layer facing the substrate may contact the portion of the first top surface 323 of the first isolation layer 3111 that is not in contact with the second bottom surface 323 of the second isolation layer 3112. The partition portion 2131 does not contact the second bottom surface 323 or the side surfaces of the second isolation layer 3112. A first gap F1 is defined between the side surfaces of the partition portion 2131 and the side surfaces of the second isolation layer 3112 (e.g., including the third side surface 333 and the fourth side surface 334).

[0111] In some examples, as shown in Figure 5, a third angle a3 may be formed between the third side surface 333 and the second top surface 324, and a fourth angle a4 may be formed between the fourth side surface 334 and the second top surface 324. The third angle a3 and the fourth angle a4 may be substantially the same. The third angle a3 may be the same as the first angle a1, and the fourth angle a4 may be the same as the second angle a2. For example, the third angle a3 and the fourth angle a4 may be greater than or equal to 55 degrees and less than or equal to 75 degrees, for example, greater than or equal to 60 degrees and less than or equal to 70 degrees. However, this embodiment is not limited to this. In other examples, the third angle a3 may be different from the fourth angle a4. In other examples, the first angle a1, the second angle a2, the third angle a3, and the fourth angle a4 may be different from each other, or may be partially the same.

[0112] In some examples, the centerline of the organic spacer column 311a along the first direction X may coincide with the centerline of the interval between the first light-emitting element 21a and the second light-emitting element 21b in the first direction X. In other words, the organic spacer column 311a may be centered within the interval between the first light-emitting element 21a and the second light-emitting element 21b. However, this embodiment is not limited to this. In other examples, the centerline of the organic spacer column 311a along the first direction X may be located on a side of the interval between the first light-emitting element 21a and the second light-emitting element 21b in the first direction X that is closer to the first light-emitting element 21a, or may be located on a side of the interval between the first light-emitting element 21a and the second light-emitting element 21b in the first direction X that is closer to the second light-emitting element 21b.

[0113] In some examples, the centerline of the first isolation layer 3111 of the organic isolation column 311a along the first direction X may substantially coincide with the centerline of the second isolation layer 3112 along the first direction X. However, this embodiment is not limited to this. For example, the centerline of the first isolation layer 3111 of the organic isolation column 311a along the first direction X may be offset from the centerline of the second isolation layer 3112 along the first direction X by a certain distance.

[0114] In some examples, as shown in FIG5 , a first distance is provided between the edge of the first side surface 331 of the first isolation layer 3111 of the organic isolation column 311a and the edge of the light-emitting region 210a of the adjacent first light-emitting element 21a, and a second distance is provided between the edge of the second side surface 332 of the first isolation layer 3111 and the edge of the light-emitting region 210b of the adjacent first light-emitting element 21b. For example, the first distance and the second distance may be the same. The organic isolation column 311a may be located between the first light-emitting element 21a and the second light-emitting element 21b. In other examples, the first distance may be greater than the second distance. The organic isolation column 311a may be disposed close to the first light-emitting element 21b. In other examples, the first distance may be less than the second distance. The organic isolation column 311a may be disposed close to the first light-emitting element 21a. This embodiment does not limit this.

[0115] In some examples, as shown in FIG5 , the thickness h1 of the first isolation layer 3111 of the organic isolation column 311a can be less than the thickness h2 of the second isolation layer 3112. The thickness h1 of the first isolation layer 3111 can refer to the vertical distance between the first top surface 322 and the first bottom surface 321, while the thickness h2 of the second isolation layer 3112 can refer to the vertical distance between the second top surface 324 and the second bottom surface 323. For example, the thickness h1 of the first isolation layer 3111 can range from 0.2 microns to 1.1 microns, such as 0.2 microns, 0.8 microns, or 1.1 microns. The thickness h2 of the second isolation layer 3112 can range from 1.2 microns to 1.6 microns, such as 1.2 microns, 1.5 microns, or 1.6 microns.

[0116] This example uses an organic isolation column with a double-layer inverted trapezoidal cross-section structure, and the thickness of the second isolation layer is greater than that of the first isolation layer. When the light-emitting functional layer is deposited, the bottom corner position of the second isolation layer of the organic isolation column is more easily cut off, forming an "undercut" structure, which can further isolate the lateral leakage current between adjacent light-emitting elements and improve the crosstalk between adjacent light-emitting elements.

[0117] In some examples, the support pillars can be disposed in the same layer as the pixel definition layer. The material of the support pillars can be the same as that of the pixel definition layer, and different from that of the organic spacers. For example, the organic spacers can be made of a negative photoresist, while the support pillars and the pixel definition layer can be made of a positive photoresist.

[0118] In some examples, the minimum height of the support column can be greater than the maximum height of the organic isolation column. The height of the support column can refer to the vertical distance between the surface of the support column away from the substrate and the surface of the substrate. The height of the organic isolation column can refer to the vertical distance between the second top surface and the surface of the substrate. In some examples, the thickness of the support column can range from 1.5 microns to 3.0 microns, such as approximately 2.3 microns to 2.5 microns, for example, 2.3 microns or 2.5 microns. In this example, by setting the minimum height of the support column to be greater than the maximum height of the organic isolation column, the occurrence of scratches between the FMM and the organic isolation column can be reduced.

[0119] FIG6 is a partially enlarged schematic diagram of area A3 in FIG5 . In some examples, as shown in FIG6 , the light-emitting functional layer 213a of the first light-emitting element 21a may include: a stacked first hole transport layer 2132a, a first light-emitting layer 2131a, a first hole blocking layer 2133a, a first charge generation layer 2135a, a second charge generation layer 2135b, a second hole transport layer 2132b, a second light-emitting layer 2131b, a second hole blocking layer 2133b, and an electron transport layer 2134. The first charge generation layer 2135a may be an N-type charge generation layer (N-CGL), and the second charge generation layer 2135b may be a P-type charge generation layer (P-CGL). The first charge generation layer 2135a and the second charge generation layer 2135b may have strong electrical conductivity, which enables the light-emitting functional layer to have the advantages of long life, low power consumption, and high brightness. For example, compared with a light-emitting functional layer without a charge generation layer, the light-emitting brightness of the light-emitting element can be increased by nearly double by providing a charge generation layer in the light-emitting functional layer.

[0120] In some examples, the first light-emitting layer and the second light-emitting layer of the same light-emitting element can be light-emitting layers that emit the same color of light. The first light-emitting layer 2131a and the second light-emitting layer 2131b of the first light-emitting element 21a can be light-emitting layers that emit the same color of light. For example, the first light-emitting layer 2131a and the second light-emitting layer 2131b can be green light-emitting layers. The first light-emitting layer and the second light-emitting layer of the second light-emitting element 21b can both be red light-emitting layers, and the first light-emitting layer and the second light-emitting layer of the third light-emitting element can both be blue light-emitting layers. However, this embodiment is not limited to this. In other examples, the first light-emitting layer and the second light-emitting layer of the same light-emitting element can be light-emitting layers that emit different colors of light. By providing light-emitting layers that emit different colors of light in the same light-emitting element, the light emitted by the multiple light-emitting layers included in the light-emitting element can be mixed into white light. By providing a color filter layer, the color of the output light of each light-emitting element can be adjusted.

[0121] In some examples, the first hole transport layer 2132a, the first hole blocking layer 2133a, the first charge generating layer 2135a, the second charge generating layer 2135b, the second hole transport layer 2132b, the second hole blocking layer 2133b and the electron transport layer 2134 can be a common layer (i.e., a common film layer) of multiple light-emitting elements. The common layer of adjacent light-emitting elements emitting light of different colors can be separated by organic isolation columns. However, this embodiment is not limited to this. In other examples, only the first charge generating layer, the second charge generating layer, the first hole transport layer and the second hole transport layer can be set as a common layer; or only the first charge generating layer and the second charge generating layer can be set as a common layer.

[0122] In some examples, as shown in FIG5 , the inactive functional layer 213d can be located between the partitioning portions of the light-emitting functional layers of adjacent light-emitting elements emitting light of different colors, and can be in contact with the second top surface 324 of the second isolation layer 3112 of the organic isolation column 311a, while not contacting the side surfaces of the second isolation layer 3112 or the first isolation layer 3111. In this example, by providing organic isolation columns of a certain height and an inverted tapered cross-section, the light-emitting functional layers of adjacent light-emitting elements emitting light of different colors can be isolated, thereby isolating the leakage current path between the adjacent light-emitting elements and improving crosstalk.

[0123] In some examples, as shown in FIG5 , the encapsulation structure layer may include: a stacked first encapsulation layer 421, a second encapsulation layer, and a third encapsulation layer. The first encapsulation layer 421 may be made of an inorganic material and cover the cathode layer in the display area. The second encapsulation layer may be made of an organic material, and the third encapsulation layer may be made of an inorganic material and cover the first encapsulation layer 421 and the second encapsulation layer. However, this embodiment is not limited to this. In other examples, the encapsulation structure layer may adopt a five-layer structure of inorganic / organic / inorganic / organic / inorganic.

[0124] In some examples, as shown in Figure 5, the first encapsulation layer 421 can be filled in the first gap F1 between the partition portion 2131 of the light-emitting functional layer and the second isolation layer 3112, so that the first encapsulation layer 421 is in contact with both the first isolation layer 3111 and the second isolation layer 3112 of the organic isolation column 311a, thereby ensuring effective contact between the first encapsulation layer 421 and the organic isolation column 311a, increasing the contact area, and helping to reduce the risk of peeling of the first encapsulation layer.

[0125] The light-emitting element of the display substrate of this example adopts a Tandem structure, uses a charge generation layer as a heterogeneous layer, and connects the two light-emitting layers in series, so that at the same luminous intensity, the luminous current of the light-emitting element can be greatly reduced, the power consumption and life of the display product can be improved, and the brightness requirements of the user can be met. When there is a crosstalk problem caused by lateral leakage current between light-emitting elements emitting light of different colors, by arranging the organic isolation column of this example including two isolation layers and an inverted cone at the interval between the light-emitting elements emitting light of different colors, the lateral leakage current path of the light-emitting functional layer of the adjacent light-emitting elements emitting light of different colors can be cut off, thereby effectively improving the crosstalk problem. The display substrate of this example does not need to reduce the conductivity of the common layer (for example, including the charge generation layer), and can ensure the power consumption of the display substrate, thereby improving the display effect. In addition, there is a first gap between the second isolation layer of the organic isolation column of this example and the partition portion of the light-emitting functional layer of the light-emitting element, and the first encapsulation layer is filled in the first gap, which can increase the effective contact area between the first encapsulation layer and the organic isolation column, which is beneficial to reduce the risk of film peeling of the first encapsulation layer.

[0126] The organic isolation structure of the display substrate of this example is described below using an example of the preparation process of a display substrate. The "patterning process" referred to in this disclosure includes processes such as photoresist coating, mask exposure, development, etching, and photoresist stripping for metal materials, inorganic materials, or transparent conductive materials, and includes processes such as organic material coating, mask exposure, and development for organic materials. Deposition can be performed by any one or more of sputtering, evaporation, and chemical vapor deposition; coating can be performed by any one or more of spraying, spin coating, and inkjet printing; and etching can be performed by any one or more of dry etching and wet etching, which are not limited in this disclosure. A "thin film" refers to a thin film produced by depositing, coating, or other processes on a substrate using a certain material. If the "thin film" does not require a patterning process during the entire production process, the "thin film" can also be referred to as a "layer." If the "thin film" requires a patterning process during the entire production process, it is referred to as a "thin film" before the patterning process and a "layer" after the patterning process. The "layer" after the patterning process contains at least one "pattern." The shape of A can refer to the shape of the orthographic projection of A on the substrate.

[0127] FIG7 is a schematic diagram of the preparation of an organic isolation structure according to at least one embodiment of the present disclosure. In some examples, as shown in FIG7 , after forming a circuit structure layer 11 on a substrate 10, an anode film is deposited on the substrate 10 on which the circuit structure layer 11 is formed, and the anode film is patterned by a patterning process to form an anode layer. The anode layer may be as shown in FIG4 , for example, and may include anodes of multiple light-emitting elements (including a first anode 211a of a first light-emitting element 21a, a second anode 211b of a second light-emitting element 21b, and a third anode 211c of a third light-emitting element 21c) and multiple anode connection electrodes.

[0128] Subsequently, a pixel definition film is applied, and the pixel definition film is patterned by a patterning process to form a pixel definition layer 24 and a plurality of support columns. The pixel definition layer 24 may be provided with a plurality of pixel openings (for example, including a first pixel opening K1 and a second pixel opening K2). The first pixel opening K1 may expose a portion of the surface of the first anode 211a, and the second pixel opening K2 may expose a portion of the surface of the second anode 211b. The support column may be located in the interval between adjacent light-emitting elements that emit light of the same color. The thickness of the support column may, for example, be greater than the thickness of the pixel definition layer. However, this embodiment is not limited thereto. In other examples, the support column and the pixel definition layer may be prepared by different steps. In some examples, the material of the pixel definition film may be a positive photoresist.

[0129] Subsequently, a first photoresist is applied to form a first photoresist layer, and the first photoresist layer is exposed and developed using a halftone mask (HTM) to form organic isolation pillars. The halftone mask may include a first light-transmitting area, a second light-transmitting area, and a light-shielding area. The transmittance of the first light-transmitting area may be greater than the transmittance of the second light-transmitting area. For example, the transmittance of the first light-transmitting area may be 100%, the transmittance of the second light-transmitting area may be less than 50%, and the transmittance of the light-shielding area may be 0. The first photoresist layer is exposed using the halftone mask, so that the exposed first photoresist layer forms a first exposed area corresponding to the first transparent area, a second exposed area corresponding to the second light-transmitting area, and a non-exposed area corresponding to the light-shielding area. The exposed first photoresist layer is developed to remove the first photoresist layer in the first exposed area, so that the second exposed area forms the non-overlapping portion of the first isolation layer 3111 and the second isolation layer 3112, and the non-exposed area forms the overlapping portion of the first isolation layer 3111 and the second isolation layer 3112. In some examples, the first photoresist may be a negative photoresist.

[0130] In this example, the organic isolation column can be prepared by a one-time patterning process using a half-tone mask to form a stacking structure of a first isolation layer and a second isolation layer, which can simplify the preparation steps.

[0131] FIG8 is another schematic diagram of fabricating an organic isolation structure according to at least one embodiment of the present disclosure. In some examples, as shown in FIG8 , after fabricating the pixel definition layer 24 , a first isolation layer 3111 and a second isolation layer 3112 of an organic isolation column 311a can be formed sequentially through two patterning processes.

[0132] In some examples, a second photoresist is applied to the substrate 10 on which the pixel definition layer 24 is formed to form a second photoresist layer, and the second photoresist layer is patterned using a first mask to form a first isolation layer 3111. Subsequently, a third photoresist is applied to form a third photoresist layer, and the third photoresist layer is patterned using a second mask to form a second isolation layer 3112. In some examples, the second and third photoresists may be negative photoresists. The remaining preparation steps of this example can be referred to the description of the previous embodiment, and thus will not be repeated here.

[0133] In other examples, a second photoresist is coated on the substrate 10 forming the pixel definition layer 24 to form a second photoresist layer, and a third mask is used to perform a patterning process on the second photoresist layer using a first exposure amount to form a first isolation layer 3111. Subsequently, a third photoresist is coated to form a third photoresist layer, and a third mask is used to perform a patterning process on the third photoresist layer using a second exposure amount to form a second isolation layer 3112. The first exposure amount is different from the second exposure amount. For example, the first exposure amount can be greater than the second exposure amount. In some examples, the second photoresist and the third photoresist can be negative photoresists. In this example, one mask is used to prepare the first isolation layer and the second isolation layer respectively through two patterning processes, which is beneficial to cost saving. The remaining preparation steps of this example can refer to the description of the previous embodiment, so they are not repeated here.

[0134] Figure 9 is another schematic partial cross-sectional view taken along the Q1-Q1' direction in Figure 3. In some examples, as shown in Figure 9, the light-emitting functional layers of adjacent light-emitting elements emitting light of different colors are separated by organic spacers. For example, the light-emitting functional layer 213a of the first light-emitting element 21a and the light-emitting functional layer 213b of the second light-emitting element 21b are separated by organic spacers 311a, so that the light-emitting functional layers 213a and 213b respectively form a partition 2131, and an inactive functional layer 213d is formed between the light-emitting functional layers 213a and 213b. The partition 2131 may include a substrate-facing surface, a surface facing away from the substrate, and a side surface connecting the substrate-facing and substrate-facing surfaces. The substrate-facing surface of the partition 2131 may contact the first spacer layer 3111, and its orthographic projection onto the substrate may partially overlap with the orthographic projection of the first spacer layer 3111 of the organic spacer 311a onto the substrate. The side surfaces of the partition portion 2131 directly contact the side surfaces of the second isolation layer 3112 without forming a gap. The first encapsulation layer 421 contacts the organic isolation pillar 311a only on the side surfaces of the second isolation layer 3112. This example, by providing an inverted tapered organic isolation pillar comprising two isolation layers, can cut off the lateral leakage current path of the light-emitting functional layers of adjacent light-emitting elements emitting light of different colors, thereby effectively improving crosstalk. The remaining description of the display substrate of this example can be referred to the description of the previous embodiment, and will not be repeated here.

[0135] Figure 10 is another partial cross-sectional schematic diagram along the Q1-Q1' direction in Figure 3. In some examples, as shown in Figure 10, the pixel definition layer 24 can be provided with multiple pixel openings and a first isolation groove V1. The first isolation groove V1 can be located in the gap between adjacent light-emitting elements that emit light of different colors. The pixel definition layer 24 in the first isolation groove V1 can be removed to expose the surface of the circuit structure layer 11 away from the substrate 10, for example, the surface of the second planar layer away from the substrate can be exposed. The orthographic projection of the first isolation groove V1 on the substrate may not overlap with the orthographic projection of the anode layer on the substrate. The organic isolation column 311a can be located in the first isolation groove V1. The organic isolation column 311a can be in direct contact with the sidewall of the first isolation groove V1. The bottom surface size of the first isolation groove V1 can be approximately the same as the size of the first bottom surface of the organic isolation column 311a.

[0136] In some examples, within the space between the first light-emitting element 21a and the second light-emitting element 21b, the light-emitting functional layer 213a of the first light-emitting element 21a and the light-emitting functional layer 213b of the second light-emitting element 21b can be formed on the pixel definition layer 24 and the first top surface and side surfaces of the first isolation layer 3111 of the organic isolation column 311a. The first isolation groove V1 can be completely covered by the organic isolation column 311a.

[0137] In some examples, multiple first isolation grooves V1 can be independently provided. An organic isolation column 311a or 311b can be disposed within each first isolation groove V1. However, this embodiment is not limited thereto. In other examples, multiple first isolation grooves can be interconnected to form a network of first isolation grooves, within which multiple independently provided organic isolation columns can be disposed, or multiple interconnected organic isolation columns can be disposed.

[0138] In some examples, during the preparation of the display substrate, after forming the pixel definition layer having the first isolation groove, the organic isolation pillars may be formed in the first isolation groove. This embodiment is not limited to this.

[0139] In this example, by forming a first isolation groove in the pixel definition layer and arranging the organic isolation column in the first isolation groove, the height of the organic isolation column relative to the support column for supporting the FMM can be reduced, and the risk of the FMM and the organic isolation column rubbing against each other to form dark spots can be reduced. In addition, the light-emitting functional layer can be formed on the first isolation layer of the organic isolation column and the pixel definition layer, and can be isolated by the second isolation layer of the organic isolation column on the first isolation layer, which can cut off the lateral leakage current path of the light-emitting functional layer, thereby improving the crosstalk between light-emitting elements emitting light of different colors. The rest of the structure of this example can refer to the description of the previous embodiment, so it will not be repeated here.

[0140] Figure 11 is another schematic partial cross-sectional view taken along the Q1-Q1' direction in Figure 3. In some examples, as shown in Figure 11, the pixel definition layer 24 may be provided with multiple pixel openings and a first isolation groove V1. The first isolation groove V1 may be located in the gap between adjacent light-emitting elements emitting light of different colors. The pixel definition layer 24 within the first isolation groove V1 may be removed, exposing the surface of the circuit structure layer 11 facing away from the substrate 10, for example, exposing the surface of the second planar layer facing away from the substrate. The orthographic projection of the first isolation groove V1 on the substrate may not overlap with the orthographic projection of the anode layer on the substrate. The organic isolation column 311a may be located within the first isolation groove V1. The orthographic projection of the organic isolation column 311a on the substrate may not overlap with the orthographic projection of the pixel definition layer 24 on the substrate. The size of the first isolation groove V1 may be larger than the size of the first bottom surface of the organic isolation column 311a. For example, the edge of the first bottom surface of the organic isolation column 311a may not contact the edge of the first isolation groove V1. A second gap F2 may be formed between an edge of the first isolation layer 3111 of the organic isolation column 311 a and a sidewall of the first isolation groove V1 .

[0141] In some examples, within the gap between the first light-emitting element 21a and the second light-emitting element 21b, the light-emitting functional layer 213a of the first light-emitting element 21a and the light-emitting functional layer 213b of the second light-emitting element 21b can be formed on the first top surface and side surfaces of the first isolation layer 3111 of the pixel definition layer 24 and the organic isolation column 311a. The partition portion 2131 of the light-emitting functional layers 213a and 213b can fill the second gap F2 between the first isolation layer 3111 and the sidewall of the first isolation groove V1. A first gap F1 is defined between the partition portion 2131 and the side surface of the second isolation layer 3112. The first encapsulation layer 421 can contact the first top surface of the first isolation layer 3111 to fill the first gap F1, thereby increasing the effective contact area with the organic isolation column and reducing the risk of film peeling of the first encapsulation layer.

[0142] This example forms a first isolation groove in the pixel definition layer and arranges the organic spacer column within the first isolation groove. This reduces the height of the organic spacer column relative to the support column used to support the FMM, thereby reducing the risk of the FMM and the organic spacer column rubbing against each other to form dark spots. Furthermore, a second gap is formed between the side of the organic spacer column and the first isolation groove in which it is located, further extending the lateral current path of the light-emitting functional layer and further improving crosstalk between light-emitting elements emitting light of different colors. The remaining structure of this example can be referred to the description of the previous embodiment, so it will not be repeated here.

[0143] Figure 12 is another schematic partial cross-sectional view taken along the Q1-Q1' direction in Figure 3. In some examples, as shown in Figure 12, the pixel definition layer 24 may be provided with multiple pixel openings and a first isolation groove V1. The first isolation groove V1 may be located in the gap between adjacent light-emitting elements emitting light of different colors. The pixel definition layer 24 within the first isolation groove V1 may be removed, exposing the surface of the circuit structure layer 11 facing away from the substrate 10, for example, exposing the surface of the second planar layer facing away from the substrate. The orthographic projection of the first isolation groove V1 on the substrate may not overlap with the orthographic projection of the anode layer on the substrate. The organic isolation column 311a may be located within the first isolation groove V1. The orthographic projection of the organic isolation column 311a on the substrate may not overlap with the orthographic projection of the pixel definition layer 24 on the substrate. The size of the first isolation groove V1 may be larger than the size of the first bottom surface of the organic isolation column 311a. For example, the edge of the first bottom surface of the organic isolation column 311a may not contact the edge of the first isolation groove V1. A second gap F2 is defined between the edge of the first isolation layer 3111 of the organic isolation column 311a and the sidewall of the first isolation groove V1. The partition portion 2131 of the light-emitting functional layers 213a and 213b can fill the second gap F2 between the first isolation layer 3111 and the sidewall of the first isolation groove V1. A first gap F1 is defined between the partition portion 2131 and the side surface of the second isolation layer 3112. The second gap F2 can be larger than the first gap F1. The first encapsulation layer 421 can fill the first gap F1, thereby increasing the effective contact area with the organic isolation column and reducing the risk of film peeling of the first encapsulation layer.

[0144] In some examples, the top dimension of the first isolation layer 3111 of the organic isolation column 311a can be approximately the same as the top dimension of the second isolation layer 3112 and larger than the bottom dimension of the second isolation layer 3112; or, the top dimension of the first isolation layer 3111a can be smaller than the top dimension of the second isolation layer 3112 and larger than the bottom dimension of the second isolation layer 3112.

[0145] In this example, by reducing the size of the first isolation layer 3111, while ensuring contact between the first encapsulation layer and the first isolation layer, the second gap can be increased, thereby further extending the lateral current path of the light-emitting functional layer and further improving the crosstalk between light-emitting elements emitting light of different colors. The remaining structure of this example can be referred to the description of the previous embodiment, and will not be repeated here.

[0146] Figure 13 is another partial cross-sectional schematic diagram along the Q1-Q1' direction in Figure 3. In some examples, as shown in Figure 13, the pixel definition layer 24 can be provided with a plurality of pixel openings and a plurality of second isolation grooves V2. The second isolation grooves V2 can be located in the interval between adjacent light-emitting elements that emit light of different colors. Part of the pixel definition layer 24 in the second isolation grooves V2 can be removed, and part of the pixel definition layer 24 can be retained. The thickness of the pixel definition layer 24 in the second isolation grooves V2 can be less than the thickness of the surrounding pixel definition layers 24. The organic isolation column 311a can be located in the second isolation grooves V2. The orthographic projection of the pixel definition layer 24 on the substrate can cover the orthographic projection of the organic isolation column 311a on the substrate.

[0147] In this example, by thinning the pixel definition layer to form a second isolation groove and placing the organic isolation column in the second isolation groove, the height of the organic isolation column relative to the support column used to support the FMM can be reduced, which can reduce the risk of the FMM and the organic isolation column rubbing against each other to form dark spots. In addition, the second gap formed between the organic isolation column and the side surface of the first isolation groove in which it is located can further extend the lateral current path of the light-emitting functional layer and further improve the crosstalk between light-emitting elements emitting light of different colors. The remaining structure of this example can be referred to the description of the previous embodiment, so it will not be repeated here.

[0148] Figure 14 is another partially enlarged schematic diagram of area A1 in Figure 1. Figure 15 is a partially enlarged schematic diagram of area A4 in Figure 14. Figure 16 is a partially cross-sectional schematic diagram along the Q2-Q2' direction in Figure 15.

[0149] In some examples, as shown in Figures 14 and 15, the organic isolation structure 31 may include a plurality of organic spacer pillars 311a and 311b. The plurality of organic spacer pillars 311a and 311b may be independently disposed. Two organic spacer pillars 311a extending in the same direction may be disposed in the interval between the first light-emitting region 210a of the first light-emitting element 21a and the second light-emitting region 210b of the adjacent second light-emitting element 21b. Two organic spacer pillars 311b extending in the same direction may be disposed in the interval between the third light-emitting region 210c of the third light-emitting element 21c and the first light-emitting region 210a of the adjacent first light-emitting element 21a and the second light-emitting region 210b of the adjacent second light-emitting element 21b. The spacing between the two organic spacer pillars 311a and the spacing between the two organic spacer pillars 311b may be set according to actual needs. This embodiment is not limited to this. In other examples, three or more organic spacer pillars extending in the same direction may be disposed in the interval between adjacent light-emitting elements emitting light of different colors.

[0150] In some examples, as shown in FIG16 , two organic spacer pillars 311 a disposed between the first light-emitting element 21 a and the second light-emitting element 21 b may be located on the pixel definition layer 24. The two organic spacer pillars 311 a may have substantially the same structure and shape. The structure of the two organic spacer pillars 311 a in this example can refer to the description of the previous embodiment, and thus will not be repeated here.

[0151] This example provides two organic spacer columns between adjacent light-emitting elements emitting different colors. By increasing the number of organic spacer columns, the leakage current path of the light-emitting functional layer between adjacent light-emitting elements can be further cut off, thereby achieving a good crosstalk isolation effect. The remaining description of this example can be referred to the description of the previous embodiment, so it will not be repeated here.

[0152] This application describes multiple embodiments, but this description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in this application. Although many possible feature combinations are shown in the drawings and discussed in the embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0153] In other examples, two organic spacer columns with the same extension direction can be set in the interval between adjacent light-emitting elements emitting light of different colors, and the two organic spacer columns can be set in the first isolation groove or the second isolation groove of the pixel definition layer. In other examples, two organic spacer columns with the same extension direction can be set in the interval between adjacent light-emitting elements emitting light of different colors, one of the organic spacer columns can be set in the first isolation groove of the pixel definition layer so that it does not overlap with the orthographic projection of the pixel definition layer on the substrate, and the other organic spacer column can be located on the pixel definition layer. In other examples, at least two organic spacer columns with the same extension direction can be set in the interval between adjacent light-emitting elements emitting light of different colors, and the at least two organic spacer columns can be set in the second isolation groove formed by thinning the pixel definition layer. This embodiment is not limited to this.

[0154] The display substrate provided in this embodiment is provided with an organic isolation column having an inverted cone structure for light-emitting elements adopting a Tandem design. By cutting off the leakage current path between adjacent light-emitting elements emitting light of different colors, the crosstalk between adjacent light-emitting elements emitting light of different colors can be improved. In some examples, the organic isolation structure is provided in a first isolation groove formed by removing the pixel definition layer or a second isolation groove formed by thinning the pixel definition layer. This can reduce the height of the organic isolation structure so that the height of the organic isolation structure is lower than the height of the support column, thereby avoiding the FMM and the organic isolation structure from scratching and causing dark spots and poor display. In some examples, by providing a first gap between the partition portion of the light-emitting functional layer and the second isolation layer of the organic isolation column, the effective contact area between the first encapsulation layer and the organic isolation column can be increased, which is conducive to reducing the risk of film peeling of the first encapsulation layer. In some examples, by providing a second gap between the edge of the organic isolation column and the sidewall of the first isolation groove or the second isolation groove in which it is located, the lateral current path of the light-emitting functional layer can be further extended, further improving the crosstalk between light-emitting elements emitting light of different colors.

[0155] Figure 17 is another partially enlarged schematic diagram of area A1 in Figure 1 . In some examples, as shown in Figure 17 , the multiple light-emitting elements in the display area may include: multiple first light-emitting elements 21a and 21d emitting a first color of light, multiple second light-emitting elements 21b emitting a second color of light, and multiple third light-emitting elements 21c emitting a third color of light. For example, the first color of light may be green, the second color of light may be red, and the third color of light may be blue. This embodiment is not limited to this.

[0156] In some examples, the plurality of light-emitting elements in the display area can be arranged according to the following pattern: the plurality of first light-emitting elements 21a and 21d are arranged alternately along the row direction and the column direction, the plurality of second light-emitting elements 21b and the plurality of third light-emitting elements 21c are arranged alternately along the row direction and the column direction, the rows where the first light-emitting elements 21a and 21d are located are alternately arranged with the rows where the second light-emitting elements 21b and the third light-emitting elements 21c are located, and the columns where the first light-emitting elements 21a and 21d are located are alternately arranged with the columns where the second light-emitting elements 21b and the third light-emitting elements 21c are located. For example, the first light-emitting elements 21a and the second light-emitting elements 21b can be arranged along a straight line with a counterclockwise (or clockwise) angle of 45 degrees to the horizontal line, and the first light-emitting elements 21a and the third light-emitting elements 21c can be arranged along a straight line with a clockwise (or counterclockwise) angle of 45 degrees to the horizontal line.

[0157] In some examples, as shown in FIG17 , the organic isolation structure may include: a plurality of first groups of organic spacer columns and a plurality of second groups of organic spacer columns. The first group of organic spacer columns may include: four independently arranged organic spacer columns 311 g, 311 h, 311 i, and 311 j. The first group of organic spacer columns may be arranged around the second light-emitting element 21 b, separating the second light-emitting element 21 b from the adjacent first light-emitting elements 21 a and 21 b and the third light-emitting element 21. The second group of organic spacer columns may include two independently arranged organic spacer columns 311 m and 311 n. The two organic spacer columns 311 m and 311 n may be located on both sides of the first light-emitting element 21 a or 21 d, separating the first light-emitting element 21 a or 21 d from the adjacent third light-emitting element 21 c. However, this embodiment is not limited to this. For example, two adjacent organic spacer columns in the first group of organic spacer columns may be connected to each other.

[0158] The structure of the organic spacer columns and the rest of the display area in this example can refer to the description of the previous embodiment, so they are not repeated here. The structure (or method) shown in this embodiment can be appropriately combined with the structure (or method) shown in other embodiments.

[0159] Figure 18 is another partially enlarged schematic diagram of area A1 in Figure 1. In some examples, as shown in Figure 18, the multiple light-emitting elements in the display area may include: multiple first light-emitting elements 21a emitting a first color of light, multiple second light-emitting elements 21b emitting a second color of light, and multiple third light-emitting elements 21c emitting a third color of light. For example, the first color of light may be green, the second color of light may be red, and the third color of light may be blue. This embodiment is not limited to this.

[0160] In some examples, the multiple light-emitting elements in the display area can be arranged according to the following pattern: in each row, they are arranged in a repeating unit of two first light-emitting elements 21a, one second light-emitting element 21b, and one third light-emitting element 21c, with the two first light-emitting elements 21a in the repeating unit arranged in the column direction. In light-emitting elements in different rows, the spacing in the row direction between light-emitting elements emitting the same color light is approximately 1.5 times the width of the light-emitting element. In this example, the widths of the first light-emitting elements 21a, the second light-emitting elements 21b, and the third light-emitting elements 21c along the row direction can be the same. In other words, the repeating units between two adjacent rows can be offset in the row direction by 1.5 times the width of the light-emitting elements. The orthographic projections of the light-emitting areas of the two first light-emitting elements 21a onto the substrate can both be pentagons (e.g., rounded pentagons). The two first light-emitting elements 21a can be symmetrical with each other, and the axis of symmetry can be parallel to the row direction. The orthographic projections of the light-emitting areas of the second light-emitting elements 21b and the third light-emitting elements 21c onto the substrate can both be hexagons (e.g., rounded hexagons). The lengths of the second light-emitting element 21b and the third light-emitting element 21c along the column direction can be the same. The length of the first light-emitting element 21a along the column direction can be less than the length of the second light-emitting element 21b along the column direction. In this example, the row direction can be parallel to the first direction X, and the column direction can be parallel to the second direction Y.

[0161] In some examples, as shown in FIG18 , the organic isolation structure 31 may include: a plurality of independently arranged organic isolation columns 311 a and 311 c. The organic isolation column 311 a may extend along the second direction Y, and the organic isolation column 311 c may be roughly in the shape of a broken line. An organic isolation column 311 a may be provided between adjacent first light-emitting elements 21 a and second light-emitting elements 21 b, an organic isolation column 311 a may be provided between adjacent first light-emitting elements 21 a and third light-emitting elements 21 c, and a plurality of organic isolation columns 311 c arranged in sequence along the first direction X may be provided between adjacent rows of light-emitting elements emitting light of different colors. An organic isolation structure may not be provided between two first light-emitting elements 21 a within a repeating unit. However, this embodiment is not limited thereto. In other examples, some adjacent organic isolation columns may be connected to each other.

[0162] The structure of the organic spacer columns and the rest of the display area in this example can refer to the description of the previous embodiment, so they are not repeated here. The structure (or method) shown in this embodiment can be appropriately combined with the structure (or method) shown in other embodiments.

[0163] Figure 19 is another partially enlarged schematic diagram of area A1 in Figure 1. In some examples, as shown in Figure 19, the multiple light-emitting elements in the display area can be arranged in the following manner: arranged in a repeating unit of a second light-emitting element 21b, a first light-emitting element 21a and a third light-emitting element 21c on each row, and in the column direction, the light-emitting elements in each column emit light of the same color. For example, the first light-emitting element 21a can be configured to emit green light, the second light-emitting element 21b can be configured to emit red light, and the third light-emitting element 21c can be configured to emit blue light. Each light-emitting element can be roughly rectangular (e.g., a rounded rectangle). The width of the light-emitting elements emitting different colors of light along the row direction can be roughly the same, and the length of the light-emitting elements emitting different colors of light in the column direction can be roughly the same.

[0164] In some examples, as shown in FIG19 , the organic isolation structure 31 may include a plurality of independently arranged organic isolation pillars 311 a extending along the second direction Y. An organic isolation pillar 311 a may be provided between adjacent columns of light-emitting elements emitting light of different colors. In this example, by providing organic isolation pillars between adjacent light-emitting elements emitting light of different colors, it is possible to prevent light-emitting elements of other colors from being illuminated during monochrome display, thereby improving the display effect.

[0165] The structure of the organic spacer columns in this example and the rest of the display area structure can be referenced to the description of the previous embodiment, and therefore will not be repeated here. The structure (or method) shown in this embodiment can be appropriately combined with the structures (or methods) shown in other embodiments. For example, two organic spacer columns extending in the same direction can be provided between adjacent columns of light-emitting elements emitting light of different colors.

[0166] Figure 20 is another partially enlarged schematic diagram of area A1 in Figure 1. In some examples, as shown in Figure 20, the multiple light-emitting elements in the display area can be arranged in the following manner: a third light-emitting element 21c, a second light-emitting element 21b, and a first light-emitting element 21a are arranged in sequence along the row direction as a repeating unit; in adjacent rows of light-emitting elements, the spacing in the row direction between light-emitting elements emitting light of the same color is approximately equal to twice the width of the light-emitting element. The lengths of the first light-emitting element 21a, the second light-emitting element 21b, and the third light-emitting element 21c along the row direction can be approximately the same, and the lengths along the column direction can be approximately the same. For example, the first light-emitting element 21a can be configured to emit green light, the second light-emitting element 21b can be configured to emit red light, and the third light-emitting element 21c can be configured to emit blue light.

[0167] In some examples, as shown in FIG20 , the organic isolation structure 31 may include: a plurality of independently arranged organic isolation columns 311 a extending along the second direction Y and a plurality of organic isolation columns 311 b extending along the first direction X. The organic isolation columns 311 a may be located between adjacent light-emitting elements along the first direction X that emit light of different colors, and the organic isolation columns 311 b may be located between adjacent light-emitting elements along the second direction Y that emit light of different colors. However, this embodiment is not limited to this. In other examples, some adjacent organic isolation columns may be connected to each other.

[0168] The structure of the organic spacer columns and the rest of the display area in this example can refer to the description of the previous embodiment, so they are not repeated here. The structure (or method) shown in this embodiment can be appropriately combined with the structure (or method) shown in other embodiments.

[0169] Figure 21 is another partially enlarged schematic diagram of area A1 in Figure 1. In some examples, as shown in Figure 21, the multiple light-emitting elements in the display area can be arranged in the following manner: a third light-emitting element 21c, a second light-emitting element 21b, and a first light-emitting element 21a are arranged in sequence along the row direction as a repeating unit; in adjacent rows of light-emitting elements, the spacing in the row direction between light-emitting elements emitting light of the same color is approximately equal to 1.5 times the width of the light-emitting element. The lengths of the first light-emitting element 21a, the second light-emitting element 21b, and the third light-emitting element 21c along the row direction can be approximately the same, and the lengths along the column direction can be approximately the same. For example, the first light-emitting element 21a can be configured to emit green light, the second light-emitting element 21b can be configured to emit red light, and the third light-emitting element 21c can be configured to emit blue light.

[0170] In some examples, as shown in FIG21 , the organic isolation structure 31 may include: a plurality of independently arranged organic isolation columns 311 a extending along the second direction Y and a plurality of organic isolation columns 311 b extending along the first direction X. The organic isolation columns 311 a may be located between adjacent light-emitting elements emitting light of different colors along the first direction X, and the organic isolation columns 311 b may be located between adjacent rows of light-emitting elements. However, this embodiment is not limited to this. In other examples, some adjacent organic isolation columns may be connected to each other.

[0171] The structure of the organic spacer columns and the rest of the display area in this example can refer to the description of the previous embodiment, so they are not repeated here. The structure (or method) shown in this embodiment can be appropriately combined with the structure (or method) shown in other embodiments.

[0172] This embodiment also provides a method for preparing a display substrate, comprising: providing a substrate; and forming an organic isolation structure and a plurality of light-emitting elements on the substrate. The organic isolation structure includes a plurality of organic spacer columns, at least one of which is located between the light-emitting regions of at least two adjacent light-emitting elements emitting light of different colors. The at least one organic spacer column includes a stacked first and second isolation layers, with the second isolation layer located on the side of the first isolation layer away from the substrate. The first isolation layer includes a first bottom surface and a first top surface, with the first bottom surface located on the side of the first top surface closer to the substrate. The second isolation layer includes a second bottom surface and a second top surface, with the second bottom surface located on the side of the second top surface closer to the substrate and in contact with the first top surface. The orthographic projection of the first top surface on the substrate overlaps the orthographic projection of the first bottom surface on the substrate, the orthographic projection of the second top surface on the substrate overlaps the orthographic projection of the second bottom surface on the substrate, and the orthographic projection of the first top surface on the substrate overlaps the orthographic projection of the second bottom surface on the substrate.

[0173] In some exemplary embodiments, forming an organic isolation structure on a substrate may include one of the following: forming the organic isolation column using a halftone mask, wherein the first isolation layer and the second isolation layer of the organic isolation column are an interconnected integral structure; forming the first isolation layer of the organic isolation column using a first mask, and forming the second isolation layer of the organic isolation column using a second mask; and sequentially forming the first isolation layer and the second isolation layer of the organic isolation column through two patterning processes using a third mask, wherein the exposure amounts of the two patterning processes are different.

[0174] The method for preparing the display substrate of this example can be referred to the description of the aforementioned embodiment, and thus will not be described in detail here.

[0175] FIG22 is a schematic diagram of a display device according to at least one embodiment of the present disclosure. As shown in FIG22 , this embodiment provides a display device 91 comprising a display substrate 910 according to the aforementioned embodiment. In some examples, the display substrate 910 may be a flexible OLED display substrate, a QLED display substrate, a Micro-LED display substrate, or a Mini-LED display substrate. The display device 91 may be a product having an image (including a static image or a dynamic image, wherein the dynamic image may be a video) display function. For example, the display device may be any of the following products: a display, a television, a billboard, a digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a picture screen, a personal digital assistant (PDA), a digital camera, a portable camcorder, a viewfinder, a navigator, a vehicle, a large-area wall, an information query device (such as a business query device for e-government, a bank, a hospital, a power department, etc.), a monitor, etc. For another example, the display device may also be a microdisplay, a VR device or an AR device containing a microdisplay, etc.

[0176] The drawings in this disclosure only relate to the structures involved in this disclosure, and other structures can refer to the general design. In the absence of conflict, the embodiments of the present disclosure, that is, the features in the embodiments, can be combined with each other to obtain new embodiments. It should be noted that the above-mentioned embodiments or implementation methods are merely exemplary and not restrictive. Therefore, the present disclosure is not limited to the contents shown and described in detail herein. Various modifications, replacements or omissions can be made to the form and details of the implementation without departing from the scope of this disclosure.

Claims

1. A display substrate, comprising: A substrate, an organic isolation structure disposed on the substrate, and a plurality of light-emitting elements; The organic isolation structure includes: a plurality of organic isolation columns, at least one of the plurality of organic isolation columns is located between light-emitting regions of at least two adjacent light-emitting elements that emit light of different colors; The at least one organic isolation column comprises: a first isolation layer and a second isolation layer stacked together, wherein the second isolation layer is located on a side of the first isolation layer away from the substrate; The first isolation layer includes: a first bottom surface and a first top surface, wherein the first bottom surface is located on a side of the first top surface close to the substrate; the second isolation layer includes: a second bottom surface and a second top surface, wherein the second bottom surface is located on a side of the second top surface close to the substrate, and the second bottom surface is in contact with the first top surface; The orthographic projection of the first top surface on the substrate covers the orthographic projection of the first bottom surface on the substrate, the orthographic projection of the second top surface on the substrate covers the orthographic projection of the second bottom surface on the substrate, and the orthographic projection of the first top surface on the substrate covers the orthographic projection of the second bottom surface on the substrate.

2. The display substrate according to claim 1, wherein The orthographic projection of the first top surface on the substrate includes the orthographic projection of the second top surface on the substrate.

3. The display substrate according to claim 1, wherein The light-emitting element includes: a light-emitting functional layer, which includes at least: two light-emitting layers and at least one charge generation layer located between the two light-emitting layers; the light-emitting functional layer is located on the side of the organic isolation structure away from the substrate, and the orthographic projection of the light-emitting functional layer on the substrate at least partially overlaps with the orthographic projection of the organic isolation structure on the substrate.

4. The display substrate according to claim 3, wherein: The orthographic projection of the at least one charge generation layer on the substrate covers the orthographic projections of the plurality of light-emitting elements on the substrate.

5. The display substrate according to claim 3, wherein: The light-emitting functional layers of adjacent light-emitting elements that emit light of different colors are separated by the organic spacer pillars. The display substrate according to claim 5 , wherein: The light-emitting functional layer includes: a partition portion formed by the organic isolation column; a first gap is provided between the partition portion and the second isolation layer, and a surface of the partition portion facing the substrate is in contact with a first top surface of the first isolation layer; the display substrate also includes: a first encapsulation layer located on a side of the multiple light-emitting elements away from the substrate, and the first encapsulation layer is in contact with the first top surface.

7. The display substrate according to claim 5, wherein: The light-emitting functional layer includes a partition portion formed by the organic spacer column; the partition portion contacts the second isolation layer, and a surface of the partition portion facing the substrate contacts the first top surface of the first isolation layer.

8. The display substrate according to claim 3, wherein: The light-emitting functional layer includes: a first hole transport layer, a first light-emitting layer, a first hole blocking layer, a first charge generating layer, a second charge generating layer, a second hole transport layer, a second light-emitting layer, a second hole blocking layer and an electron transport layer stacked in sequence.

9. The display substrate according to claim 1, wherein: The first isolation layer and the second isolation layer of the at least one organic isolation column are an integral structure connected to each other.

10. The display substrate according to claim 1, wherein The thickness of the first isolation layer ranges from 0.2 micrometers to 1.1 micrometers, and the thickness of the second isolation layer ranges from 1.2 micrometers to 1.6 micrometers.

11. The display substrate according to claim 1, wherein: The light-emitting element comprises: a stacked first electrode, a light-emitting functional layer, and a second electrode, wherein the first electrode is located on a side of the second electrode close to the substrate; The display substrate further comprises: a pixel definition layer located on a side of the first electrode of the light-emitting element away from the substrate, the pixel definition layer being provided with a pixel opening, the light-emitting functional layer being in contact with the first electrode through the pixel opening; the organic isolation structure being located on a side of the pixel definition layer away from the substrate; The orthographic projection of the pixel definition layer on the substrate covers the orthographic projection of the organic isolation structure on the substrate.

12. The display substrate according to claim 1, wherein The light-emitting element comprises: a stacked first electrode, a light-emitting functional layer, and a second electrode, wherein the first electrode is located on a side of the second electrode close to the substrate; The display substrate further comprises: a pixel definition layer located on a side of the first electrode of the light-emitting element away from the substrate, the pixel definition layer being provided with a pixel opening, and the light-emitting functional layer being in contact with the first electrode through the pixel opening; The orthographic projection of the pixel definition layer on the substrate does not overlap with the orthographic projection of the organic isolation structure on the substrate, or the orthographic projection of the pixel definition layer on the substrate partially overlaps with the orthographic projection of the organic isolation structure on the substrate.

13. The display substrate according to claim 12, wherein: The pixel definition layer is provided with at least one first isolation groove, and the at least one organic isolation column of the organic isolation structure is arranged in the at least one first isolation groove; the first isolation groove does not overlap with the orthographic projection of the first electrode of the light-emitting element on the substrate; there is a second gap between the organic isolation column arranged in the first isolation groove and the side wall of the first isolation groove; the light-emitting functional layer is in contact with the side wall of the first isolation groove.

14. The display substrate according to claim 12, wherein: The pixel definition layer is provided with at least one first isolation groove, and the at least one organic isolation column of the organic isolation structure is arranged in the at least one first isolation groove; the orthographic projection of the first isolation groove on the substrate does not overlap with the orthographic projection of the first electrode of the light-emitting element on the substrate; the organic isolation column arranged in the first isolation groove is in contact with the side wall of the first isolation groove.

15. The display substrate according to claim 1, wherein At least two adjacent organic isolation columns extending in the same direction are provided at a distance between the light emitting areas of the at least two adjacent light emitting elements emitting light of different colors.

16. The display substrate according to claim 1, further comprising: a plurality of support columns, at least one of the plurality of support columns being located between light-emitting regions of two adjacent light-emitting elements emitting light of the same color; The maximum height of the organic spacer column is less than or equal to the minimum height of the support column.

17. The display substrate according to claim 16, wherein: The material of the supporting pillars is different from that of the organic spacer pillars.

18. The display substrate according to claim 1, wherein The plurality of light-emitting elements include: a plurality of first light-emitting elements emitting a first color light, a plurality of second light-emitting elements emitting a second color light, and a plurality of third light-emitting elements emitting a third color light; the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged in a row along a first direction, the plurality of third light-emitting elements are arranged in a row along the first direction, and the row of light-emitting elements including the first light-emitting elements and the second light-emitting elements and the row of third light-emitting elements are arranged in a second direction, and the first direction intersects the second direction; The organic isolation structure includes: a plurality of organic isolation columns extending along the first direction and a plurality of organic isolation columns extending along the second direction; at least one organic isolation column extending along the second direction is provided in the interval between adjacent first and second light-emitting elements; and at least one organic isolation column extending along the first direction is provided in the interval between adjacent third light-emitting elements and the first and second light-emitting elements.

19. A display device comprising the display substrate according to any one of claims 1 to 18.

20. A method for preparing a display substrate, comprising: providing a substrate; An organic isolation structure and a plurality of light-emitting elements are formed on the substrate; wherein the organic isolation structure comprises: a plurality of organic isolation columns, at least one of the plurality of organic isolation columns is located between light-emitting regions of at least two adjacent light-emitting elements emitting light of different colors; the at least one organic isolation column comprises: a stacked first isolation layer and a second isolation layer, the second isolation layer being located on a side of the first isolation layer away from the substrate; the first isolation layer comprises: a first bottom surface and a first top surface, the first bottom surface being located on a side of the first top surface close to the substrate; the second isolation layer comprises: a second bottom surface and a second top surface, the second bottom surface being located on a side of the second top surface close to the substrate, and the second bottom surface is in contact with the first top surface; the orthographic projection of the first top surface on the substrate covers the orthographic projection of the first bottom surface on the substrate, the orthographic projection of the second top surface on the substrate covers the orthographic projection of the second bottom surface on the substrate, and the orthographic projection of the first top surface on the substrate covers the orthographic projection of the second bottom surface on the substrate.

21. The preparation method according to claim 20, wherein Forming an organic isolation structure on the substrate includes one of the following: The organic spacer is formed by using a half-tone mask, wherein the first spacer layer and the second spacer layer of the organic spacer are an integrated structure connected to each other; forming a first isolation layer of the organic isolation column using a first mask, and forming a second isolation layer of the organic isolation column using a second mask; A first isolation layer and a second isolation layer of the organic isolation column are sequentially formed through two patterning processes using a third mask, wherein the exposure doses of the two patterning processes are different.

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