Display substrate and display device

Abstract

A display substrate includes 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 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. The 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 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.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of display technology, and particularly relates to a display substrate and a display device. Background Art

[0002] An organic light-emitting diode (OLED) is an active light-emitting display device, which has the advantages of self-luminescence, wide viewing angle, high contrast ratio, low power consumption, extremely high response speed, etc. With the continuous development of display technology, a display device using an OLED as a light-emitting device and controlled by a thin film transistor (TFT) has become the mainstream product in the current display field. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail in this application. This overview is not intended to limit the scope of protection of the claims.

[0004] Embodiments of the present application provide a display substrate and a display device.

[0005] On the one hand, this embodiment provides a display substrate, including: 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, and at least one of the plurality of organic isolation columns is located in an interval between the light-emitting regions of at least two adjacent light-emitting elements that emit different colors of light. The at least one organic isolation column includes: a first isolation layer and a second isolation layer stacked thereon, and 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, and 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, and 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.

[0006] 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.

[0007] In some exemplary embodiments, the light-emitting element includes: a light-emitting functional layer, the light-emitting functional layer at least including: 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 a side of the organic isolation structure away from the substrate, and a positive projection of the light-emitting functional layer on the substrate and a positive projection of the organic isolation structure on the substrate at least partially overlap.

[0008] In some exemplary embodiments, a positive projection of the at least one charge generation layer on the substrate covers positive projections of a plurality of light-emitting elements on the substrate.

[0009] In some exemplary embodiments, the light-emitting functional layers of adjacent light-emitting elements that emit different colors of light are separated by the organic isolation posts.

[0010] In some exemplary embodiments, the light-emitting functional layer of the light-emitting element includes: a partition portion formed by being separated by the organic isolation posts; 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, and the first encapsulation layer is in contact with the first top surface.

[0011] In some exemplary embodiments, the light-emitting functional layer includes: a partition portion formed by being separated by the organic isolation posts; 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 a first top surface of the first isolation layer.

[0012] 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 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.

[0013] In some exemplary embodiments, the first isolation layer and the second isolation layer of the at least one organic isolation post are an integrally connected structure.

[0014] In some exemplary embodiments, the thickness range of the first isolation layer is from 0.2 micrometers to 1.1 micrometers, and the thickness range of the second isolation layer is from 1.2 micrometers to 1.6 micrometers.

[0015] In some exemplary embodiments, the light-emitting element includes: a first electrode, a light-emitting functional layer, and a second electrode stacked thereon, and the first electrode is located on a side of the second electrode close 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 away from the substrate, the pixel definition layer is provided with a pixel opening, and the light-emitting functional layer is in contact with the first electrode through the pixel opening; the organic isolation structure is located on a side of the pixel definition layer away from the substrate. A positive projection of the pixel definition layer on the substrate covers a positive projection of the organic isolation structure on the substrate.

[0016] In some exemplary embodiments, the light-emitting element includes: a first electrode, a light-emitting functional layer, and a second electrode stacked thereon, and the first electrode is located on a side of the second electrode close 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 away from the substrate, the pixel definition layer is provided with a pixel opening, and the light-emitting functional layer is in contact with the first electrode through the pixel opening. A positive projection of the pixel definition layer on the substrate does not overlap with a positive projection of the organic isolation structure on the substrate, or a positive projection of the pixel definition layer on the substrate partially overlaps with a positive projection of the organic isolation structure on the substrate.

[0017] In some exemplary embodiments, the pixel definition layer is provided with at least one first isolation groove, and at least one organic isolation column of the organic isolation structure is disposed in the at least one first isolation groove; a positive projection of the first isolation groove on the substrate does not overlap with a positive projection of the first electrode of the light-emitting element on the substrate; there is a second gap between the organic isolation column disposed in the first isolation groove and a sidewall of the first isolation groove; the light-emitting functional layer is in contact with the sidewall of the first isolation groove.

[0018] In some exemplary embodiments, the pixel definition layer is provided with at least one first isolation groove, and at least one organic isolation column of the organic isolation structure is disposed in the at least one first isolation groove; a positive projection of the first isolation groove on the substrate does not overlap with a positive projection of the first electrode of the light-emitting element on the substrate; the organic isolation column disposed in the first isolation groove is in direct contact with a sidewall of the first isolation groove.

[0019] In some exemplary embodiments, at least two adjacent organic isolation columns adjacent to each other and extending in the same direction are disposed between light-emitting regions of at least two adjacent light-emitting elements that emit light of different colors.

[0020] In some exemplary embodiments, the display substrate further includes: a plurality of support pillars, at least one of the plurality of support pillars being located in an interval between the light-emitting regions of two adjacent light-emitting elements that emit light of the same color; a maximum height of the organic isolation pillar being less than or equal to a minimum height of the support pillar.

[0021] In some exemplary embodiments, a material of the support pillar is different from a material of the organic isolation pillar.

[0022] In some exemplary embodiments, the plurality of light-emitting elements includes: a plurality of first light-emitting elements that emit first-color light, a plurality of second light-emitting elements that emit second-color light, and a plurality of third light-emitting elements that emit third-color light; the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged at intervals in a first direction in a row, the plurality of third light-emitting elements are arranged in a row in the first direction, a row of light-emitting elements including the first light-emitting elements and the second light-emitting elements and a row of third light-emitting elements are arranged at intervals in a second direction, the first direction intersecting the second direction. The organic isolation structure includes: a plurality of organic isolation pillars extending in the first direction and a plurality of organic isolation pillars extending in the second direction; at least one organic isolation pillar extending in the second direction is disposed in an interval between adjacent first light-emitting elements and second light-emitting elements; at least one organic isolation pillar extending in the first direction is disposed in an interval between an adjacent third light-emitting element and the first light-emitting elements and the second light-emitting elements.

[0023] On the other hand, the present embodiment provides a display device including the display substrate as described above.

[0024] On the other hand, the present embodiment provides a method for manufacturing a display substrate, including: providing a substrate; forming an organic isolation structure and a plurality of light-emitting elements on the substrate. Wherein, the organic isolation structure includes: a plurality of organic isolation pillars, at least one of the plurality of organic isolation pillars being located in an interval between the light-emitting regions of at least two adjacent light-emitting elements that emit different colors of light; the at least one organic isolation pillar includes: a first isolation layer and a second isolation layer stacked, the second isolation layer being 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, the first bottom surface being 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, 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; a positive projection of the first top surface on the substrate covers a positive projection of the first bottom surface on the substrate, a positive projection of the second top surface on the substrate covers a positive projection of the second bottom surface on the substrate, and a positive projection of the first top surface on the substrate covers a positive projection of the second bottom surface on the substrate.

[0025] In some exemplary embodiments, forming an organic isolation structure on the substrate includes one of the following: forming the organic isolation pillars using a halftone mask, where the first isolation layer and the second isolation layer of the organic isolation pillars are an integrally connected structure; forming the first isolation layer of the organic isolation pillars using a first mask and forming the second isolation layer of the organic isolation pillars using a second mask; forming the first isolation layer and the second isolation layer of the organic isolation pillars sequentially through two patterning processes using a third mask, where the exposure amounts of the two patterning processes are different.

[0026] Other features and advantages of the present application will be described in the subsequent description, and in part will be obvious from the description, or will be understood by implementing the present application. Other advantages of the present application can be realized and obtained through the solutions described in the description and the drawings. Description of the Drawings

[0027] The drawings are used to provide an understanding of the technical solutions of the present application, and constitute a part of the description. Together with the embodiments of the present application, they are used to explain the technical solutions of the present application and do not constitute a limitation to the technical solutions of the present application.

[0028] Figure 1 Schematic diagram of a display substrate according to at least one embodiment of the present disclosure;

[0029] Figure 2 is Figure 1 Partial enlarged schematic diagram of area A1 in

[0030] Figure 3 is Figure 2 Partial enlarged schematic diagram of area A2 in

[0031] Figure 4 is Figure 3 Planar schematic diagram of the anode layer in

[0032] Figure 5 is Figure 3 Partial cross-sectional schematic diagram along the Q1-Q1' direction in

[0033] Figure 6 is Figure 5 Partial enlarged schematic diagram of area A3 in

[0034] Figure 7 Schematic diagram of the preparation of an organic isolation structure according to at least one embodiment of the present disclosure;

[0035] Figure 8 Another schematic diagram of the preparation of an organic isolation structure according to at least one embodiment of the present disclosure;

[0036] Figure 9 is Figure 3Another partial sectional view schematic diagram along the Q1-Q1' direction in

[0037] Figure 10 is Figure 3 Another partial sectional view schematic diagram along the Q1-Q1' direction in

[0038] Figure 11 is Figure 3 Another partial sectional view schematic diagram along the Q1-Q1' direction in

[0039] Figure 12 is Figure 3 Another partial sectional view schematic diagram along the Q1-Q1' direction in

[0040] Figure 13 is Figure 3 Another partial sectional view schematic diagram along the Q1-Q1' direction in

[0041] Figure 14 is Figure 1 Another partial enlarged view schematic diagram of area A1 in

[0042] Figure 15 is Figure 14 Partial enlarged view schematic diagram of area A4 in

[0043] Figure 16 is Figure 15 Partial sectional view schematic diagram along the Q2-Q2' direction in

[0044] Figure 17 is Figure 1 Another partial enlarged view schematic diagram of area A1 in

[0045] Figure 18 is Figure 1 Another partial enlarged view schematic diagram of area A1 in

[0046] Figure 19 is Figure 1 Another partial enlarged view schematic diagram of area A1 in

[0047] Figure 20 is Figure 1 Another partial enlarged view schematic diagram of area A1 in

[0048] Figure 21 is Figure 1 Another partial enlarged view schematic diagram of area A1 in

[0049] Figure 22 Schematic diagram of a display device according to at least one embodiment of the present disclosure. Detailed implementation manners

[0050] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. The implementation manners can be implemented in multiple different forms. It is easy for those of ordinary skill in the art to understand the fact that the manners and contents can be transformed into one or more forms without departing from the gist and scope of the present application. Therefore, the present application should not be construed as being limited only to the contents described in the following implementation manners. Without conflict, the embodiments and features in the embodiments of the present application can be combined arbitrarily with each other.

[0051] In the accompanying drawings, sometimes, for clarity, the sizes of one or more constituent elements, the thickness of layers, or regions are exaggerated. Therefore, one manner of the present application is not necessarily limited to such dimensions, and the shapes and sizes of multiple components in the drawings do not reflect the true proportions. In addition, the accompanying drawings schematically show ideal examples, and one manner of the present application is not limited to the shapes or values shown in the drawings.

[0052] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0053] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly defined.

[0054] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the meanings of the above terms in the present application can be understood according to the circumstances.

[0055] In the present application, "electrically connected" includes the case where constituent elements are connected together through an element having a certain electrical effect. The "element having a certain electrical effect" is not particularly limited as long as it can transmit an electrical signal between the constituent elements to be connected. Examples of the "element having a certain electrical effect" include not only electrodes and wirings, but also switching elements such as transistors, resistors, inductors, capacitors, and other elements having one or more functions.

[0056] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0057] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", or "some examples" means that the features, structures, materials, or characteristics described in connection 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0058] In the present application, a transistor refers to an element including at least three terminals: a gate electrode, a drain electrode, and a source electrode. The transistor has a channel region between the drain electrode (drain electrode terminal, drain region, or drain electrode) and the 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 the present disclosure, the channel region refers to the region where current mainly flows.

[0059] In the present application, the first pole can be the drain electrode and the second pole can be the source electrode, or the first pole can be the source electrode and the second pole can be the drain electrode. In the case of using transistors with opposite polarities or when the direction of current in the circuit operation changes, etc., the functions of the "source electrode" and the "drain electrode" sometimes swap with each other. Therefore, in the present disclosure, the "source electrode" and the "drain electrode" can swap with each other.

[0060] In this application, "parallel" means that the angle formed by two straight lines is more than -10° and less than 10°, so it can include the state where the angle is more than -5° and less than 5°. In addition, "perpendicular" means that the angle formed by two straight lines is more than 80° and less than 100°, so it can include the state where the angle is more than 85° and less than 95°.

[0061] "About" and "substantially" in this application mean not strictly defining the boundary and allowing values within the process and measurement error range.

[0062] In this specification, A extends along the B direction means that A can include a main part and a secondary part connected to the main part. The main part is a line, line segment or strip-shaped body. The main part extends along the B direction, and the length of the main part extending along the B direction is greater than the length of the secondary part extending along other directions. "A extends along the B direction" mentioned in this specification all means that "the main part of A extends along the B direction".

[0063] "A and B are of the same layer structure" and "A and B are arranged on the same layer" mentioned in this specification mean that A and B are formed simultaneously through the same patterning process, or the surfaces of A and B close to the substrate are basically at the same distance from the substrate, or the surfaces of A and B close to the substrate are in direct contact with the same film layer. "The same layer" does not always mean that the thickness or height of the layer is the same in the cross-sectional view.

[0064] In this application, the "thickness" and "height" of the film layer are the dimensions of the film layer in the direction perpendicular to the display substrate. The "thickness" of the film layer refers to the vertical distance between the surface of the film layer far from the substrate and the surface close to the substrate. The "height" of the film layer refers to the vertical distance between the surface of the film layer far from the substrate and the substrate surface.

[0065] 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 range 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 range of the orthographic projection of A.

[0066] The OLED light-emitting element includes: an anode (Anode), a light-emitting functional layer, and a cathode (Cathode) stacked in sequence. Under the voltage drive of the anode and the cathode, the organic material of the light-emitting functional layer emits light according to the required gray level by using its light-emitting characteristics. In order to reduce the process difficulty and improve the yield, some of the film layers in the light-emitting functional layer of the OLED light-emitting element adopt a common layer design as the entire film layer. After research, the inventor found that: when the film layer with a relatively large conductivity in the light-emitting functional layer is used as the common layer, crosstalk is likely to occur between adjacent light-emitting elements. For example, the common layer with a relatively large conductivity (such as a hole injection layer, etc.) can direct the leakage current of the light-emitting element that needs to emit light to an adjacent light-emitting element that does not need to emit light, resulting in a slight brightness of the adjacent light-emitting element that does not need to emit light and causing crosstalk defects. Moreover, at low gray levels, the brightness deviation caused by the crosstalk current is relatively obvious, resulting in the inability to accurately display the required color, seriously affecting the color accuracy of the display product at low gray levels. For example, due to the relatively large driving voltage of the blue light-emitting element, the blue light-emitting element is likely to cause the red light-emitting element and the green light-emitting element to emit light during low gray-level monochromatic display, thus resulting in a color mixing situation.

[0067] This embodiment provides a display substrate and a display device, which can improve the display defects caused by crosstalk between adjacent light-emitting elements, thereby improving the display effect.

[0068] This embodiment provides a display substrate, including: 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, and at least one of the plurality of organic isolation columns is located in the interval between the light-emitting regions of at least two adjacent light-emitting elements that emit different colors of light. At least one organic isolation column includes: a first isolation layer and a second isolation layer stacked, the second isolation layer is located on the side of the first isolation layer away from the substrate, and the orthographic projection of the first isolation layer on the substrate covers 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 is located on the side of the first top surface close to the substrate; the second isolation layer includes: a second bottom surface and a second top surface, the second bottom surface is located on the 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.

[0069] In some examples, the size of the first top surface of the first isolation layer can be larger than the size of the first bottom surface. The orthographic projection of the first bottom surface on the substrate can be located within the orthographic projection range of the first top surface on the substrate. For example, in a plane perpendicular to the extension direction of the organic isolation column and perpendicular to the substrate, the cross-sectional shape of the first isolation layer can be approximately an inverted trapezoid, such as an inverted isosceles trapezoid.

[0070] In some examples, the size of the second top surface of the second isolation layer may be larger than the size of the second bottom surface. The orthographic projection of the second bottom surface on the substrate may be within the orthographic projection range of the second top surface on the substrate. For example, in a plane perpendicular to the extending direction of the organic isolation pillar and perpendicular to the substrate, the cross-sectional shape of the second isolation layer may be generally an inverted trapezoid, such as an inverted isosceles trapezoid.

[0071] In some examples, the size of the first top surface of the first isolation layer may be larger than the size of the second bottom surface of the second isolation layer. The orthographic projection of the second bottom surface on the substrate may be within the orthographic projection range of the first top surface on the substrate. The first isolation layer and the second isolation layer may be stacked to form a stacked structure of double inverted trapezoids.

[0072] The display substrate provided in this embodiment uses an organic isolation pillar including two isolation layers, and the cross-section of the isolation layer is designed as an inverted trapezoid, which can extend or block the leakage current path between adjacent light-emitting elements emitting different colors of light, thereby improving the display defect caused by the crosstalk of adjacent light-emitting elements emitting different colors of light and enhancing the display effect.

[0073] 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 sizes 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 within the orthographic projection range of the first top surface on the substrate. In some 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 within the orthographic projection range of the first top surface on the substrate, and the orthographic projection of the first top surface on the substrate may overlap with the orthographic projection of the second top surface on the substrate. In some 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 within the orthographic projection range of the first top surface on the substrate, and the orthographic projection of the first top surface on the substrate may be within the orthographic projection range of the second top surface on the substrate. For example, in a plane perpendicular to the extending direction of the organic isolation pillar and perpendicular to the substrate, the cross-sectional shape of the organic isolation pillar may be a stacked structure in which a smaller-sized inverted trapezoid is stacked on a larger-sized inverted trapezoid; or, the cross-sectional shape of the organic isolation pillar may be a stacked structure of two inverted trapezoids with the same size; or, the cross-sectional shape of the organic isolation pillar may be a stacked structure in which a larger-sized inverted trapezoid is stacked on a smaller-sized inverted trapezoid. This embodiment does not limit this.

[0074] In some exemplary embodiments, the light-emitting element may include: a light-emitting functional layer, the light-emitting functional layer at least including: 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 and the orthographic projection of the organic isolation structure on the substrate may partially overlap. 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 heterojunction layer to connect the two light-emitting layers in series, so that at the same light-emitting intensity, the light-emitting current of the light-emitting element can be greatly reduced, the power consumption and lifespan of the display product can be improved, and the brightness requirements of users can be met.

[0075] In some exemplary embodiments, the orthographic projection of at least one charge generation layer on the substrate may cover the orthographic projections of multiple light-emitting elements on the substrate. Since the conductivity of the charge generation layer is relatively large and the charge generation layers of adjacent light-emitting elements are continuous film layers, crosstalk is likely to occur between adjacent light-emitting elements. In this example, by providing organic isolation pillars between adjacent light-emitting elements that emit different colors of light, the organic isolation pillars can be used to block or extend the leakage current path between adjacent light-emitting elements, thereby reducing the leakage current between adjacent light-emitting elements that emit different colors of light and improving the display defects caused by crosstalk.

[0076] In some exemplary embodiments, the light-emitting functional layers of adjacent light-emitting elements that emit different colors of light may be blocked by the organic isolation pillars. In this example, the organic isolation pillars provided between adjacent light-emitting elements that emit different colors of light can be used to block the leakage current path between adjacent light-emitting elements, thereby reducing the leakage current between adjacent light-emitting elements that emit different colors of light and improving the display defects caused by crosstalk.

[0077] In some exemplary embodiments, the light-emitting functional layer may include: partition portions formed by being partitioned by organic isolation pillars. A first gap may be provided between the partition portions and the second isolation layer, and the surface of the partition portions 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, by forming a first gap between the partition portions and the second isolation layer and filling the first gap with the first encapsulation layer, the toughness of the display substrate can be enhanced, and the situation of film peeling of the display substrate can be prevented. In some other examples, the partition portions may be in contact with the second isolation layer, and the surface of the partition portions facing the substrate may be in contact with the first top surface of the first isolation layer.

[0078] In some exemplary embodiments, the first isolation layer and the second isolation layer of at least one organic isolation pillar may be an integrally connected structure. In some examples, the first isolation layer and the second isolation layer of the organic isolation pillar may be formed by the same patterning process, which can simplify the preparation steps. However, this embodiment is not limited thereto. In some other examples, the first isolation layer and the second isolation layer of the organic isolation pillar may be formed by two patterning processes.

[0079] 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 range of the first isolation layer may be from 0.2 micrometers to 1.1 micrometers, and the thickness range of the second isolation layer may be from 1.2 micrometers to 1.6 micrometers. In this example, by setting the thickness of the second isolation layer to be greater than the thickness of the first isolation layer, the leakage current path between adjacent light-emitting elements can be truncated by the second isolation layer.

[0080] In some exemplary embodiments, the light-emitting element may include: a first electrode, a light-emitting functional layer, and a second electrode stacked thereon, and the first electrode may be located on the 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 the 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 the 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.

[0081] In some exemplary embodiments, the orthographic projection of the pixel definition layer on the substrate and the orthographic projection of the organic isolation structure on the substrate may have no overlap, or the orthographic projection of the pixel definition layer on the substrate and the orthographic projection of the organic isolation structure on the substrate may partially overlap. In this example, by removing or thinning the pixel definition layer under the organic isolation structure, the height of the organic isolation structure can be reduced, thereby avoiding rubbing between the fine metal mask (FMM) and the organic isolation structure. Moreover, the leakage current path between adjacent light-emitting elements emitting different colors of light can be further increased, and the crosstalk between adjacent light-emitting elements emitting different colors of light can be improved.

[0082] 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 is disposed in at least one first isolation groove. The orthographic projection of the first isolation groove on the substrate and the orthographic projection of the first electrode of the light-emitting element on the substrate do not overlap. A second gap may be provided between the organic isolation column disposed in the first isolation groove and the side wall of the first isolation groove; the light-emitting functional layer may be in contact with the side wall 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 side wall of the first isolation groove, the leakage current path between adjacent light-emitting elements emitting different colors of light can be further increased, and the crosstalk between adjacent light-emitting elements emitting different colors of light can be improved. In other examples, the organic isolation column disposed in the first isolation groove and the side wall of the first isolation groove may be in direct contact.

[0083] In some exemplary embodiments, at least two adjacent organic isolation columns extending in the same direction may be provided between the light-emitting regions of at least two adjacent light-emitting elements emitting different colors of light. In this example, by providing at least two organic isolation columns between adjacent light-emitting elements emitting different colors of light, the leakage current path between adjacent light-emitting elements can be further extended, and the display defect caused by crosstalk between adjacent light-emitting elements emitting different colors of light can be further improved, thereby improving the display effect.

[0084] In some exemplary embodiments, the display substrate may further include: a plurality of support pillars, and at least one of the plurality of support pillars may be located in the interval between the light-emitting regions of two adjacent light-emitting elements that emit light of the same color. The maximum height of the organic isolation pillars may be less than or equal to the minimum height of the support pillars. In some examples, the material of the support pillars may be different from the material of the organic isolation pillars. For example, the material of the support pillars may be the same as the material of the pixel defining layer and different from the material of the organic isolation pillars. The support pillars in this example are configured to support the FMM. By setting the height of the organic isolation pillars lower than the height of the support pillars, it is possible to avoid rubbing between the FMM and the organic isolation pillars, and avoid the resulting dark spot display defect.

[0085] The solutions of this embodiment will be illustrated by some examples below.

[0086] Figure 1 Schematic diagram of the display substrate according to at least one embodiment of the present disclosure. In some examples, as Figure 1 shown, 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 on all sides, 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 for driving the light-emitting element to emit light. In some examples, the size of the display substrate may be a micro-display size, a small and medium size, or a large size. The size and resolution of the display substrate are not limited in this example.

[0087] Figure 2 For Figure 1 a partial enlarged schematic diagram of area A1 in Figure 3 For Figure 2 a partial enlarged schematic diagram of area A2 in Figure 4 For Figure 3 a planar schematic diagram of the anode layer in Figure 2 and Figure 3 shown, on a plane parallel to the display substrate, the plurality of sub-pixels in the display area AA may include: a plurality of first sub-pixels P1 that emit first-color light, a plurality of second sub-pixels P2 that emit second-color light, and a plurality of third sub-pixels P3 that emit third-color light. The first sub-pixel P1 may include a first light-emitting element 21a that emits first-color light, the second sub-pixel P2 may include a second light-emitting element 21b that emits second-color light, and the third sub-pixel P3 may include a third light-emitting element 21c that emits third-color light.

[0088] In some examples, the first color light may be green light, the second color light may be red light, and the third color light may be blue light. 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 21c may be a blue light-emitting element. However, this embodiment is not limited thereto.

[0089] In some examples, such as Figure 2 and Figure 3 shown, a pixel unit of the display area AA may include: a first sub-pixel P1, a second sub-pixel P2, and a third sub-pixel P3. In a pixel unit, the first light-emitting element 21a of the first sub-pixel P1 and the second light-emitting element 21b of the second sub-pixel P2 may be arranged in alignment along the first direction X, and the third light-emitting element 21c of the third sub-pixel P3 may be on the same side of the first light-emitting element 21a and the second light-emitting element 21b in the second direction Y. A plurality of pixel units of the 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 plurality of first sub-pixels P1 and the second light-emitting elements 21b of the plurality of second sub-pixels P2 may be arranged at intervals along the first direction X to form a row, and the third light-emitting elements 21c of the plurality of third sub-pixels P3 may be arranged in a row along the first direction X. A row of the third light-emitting elements 21c and a row of the light-emitting elements including the first light-emitting element 21a and the second light-emitting element 21b may be arranged at intervals in the second direction Y. The plurality of third light-emitting elements 21c may be arranged in alignment in the second direction Y.

[0090] In some examples, such as Figures 2 to 4As shown, the first light-emitting element 21a may include: a first anode 211a, the second light-emitting element 21b may include: a second anode 211b, and the third light-emitting element 21c may include: a third anode 211c. The orthographic projections of the first anode 211a, the second anode 211b, and the third anode 211c on the substrate may all be substantially rectangular. The first anode 211a and the first anode connection electrode 214a may be an integrally connected structure. The first anode connection electrode 214a may be connected to the pixel circuit that drives the first light-emitting element 21a to emit light. The first anode connection electrode 214a may be located on a side of the first anode 211a close to the third anode 211c. The second anode 211b and the second anode connection electrode 214b may be an integrally connected structure. The second anode connection electrode 214b may be connected to the pixel circuit that drives the second light-emitting element 21b to emit light. The second anode connection electrode 214b may be located on a side of the second anode 211b close to the third anode 211c. The third anode 211c and the third anode connection electrode 214c may be an integrally connected structure. The third anode connection electrode 214c may be connected to the pixel circuit that drives the third light-emitting element 21c to emit light. The third anode connection electrode 214c may 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 thereto.

[0091] In some examples, as Figure 2 and Figure 3 shown, 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 the area of the second light-emitting region 210b, and the area of the second light-emitting region 210b may be smaller than the area 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 range 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 range 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 range of the third anode 211c on the substrate.

[0092] In some examples, as Figure 2 and Figure 3As shown, in a plane parallel to the display substrate, the display area AA may further include: an organic isolation structure 31. The organic isolation structure 31 may include: a plurality of organic isolation columns 311a and 311b. The plurality of organic isolation columns 311a and 311b may be independently arranged. The extending direction of the organic isolation column 311a and the extending direction of the organic isolation column 311b may intersect, for example, may be perpendicular to each other. For example, the organic isolation column 311a may extend along the second direction Y, and the organic isolation column 311b may extend along the first direction X. The orthographic projection of the organic isolation column 311a on the substrate may be substantially a strip extending along the second direction Y, and the orthographic projection of the organic isolation column 311b on the substrate may be substantially a strip extending along the first direction X. However, this embodiment does not limit this. In some other examples, some of the organic isolation columns 311a and 311b of the organic isolation structure 31 may be an integrally connected structure.

[0093] In some examples, as Figure 2 and Figure 3 shown, the organic isolation column 311a may be located within 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, one organic isolation column 311a may be provided within the interval between the first light-emitting region 210a of each two adjacent first light-emitting elements 21a and the second light-emitting region 210b of the second light-emitting element 21b. The orthographic projection of the organic isolation column 311a on the substrate may have no overlap with the orthographic projections 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 isolation column 311a on the substrate may have no overlap with the orthographic projections 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 does not limit this. For example, the orthographic projection of the organic isolation column 311a on the substrate may partially overlap with the orthographic projections 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 have no overlap with the orthographic projections of the first light-emitting region 210a and the second light-emitting region 210b on the substrate.

[0094] In some examples, as Figure 2 and Figure 3As shown, the organic isolation column 311b can be located in the interval between the third light-emitting region 210c of the third light-emitting element 21c and the first light-emitting regions 210a of the adjacent first light-emitting element 21a and the second light-emitting regions 210b of the second light-emitting element 21b. The orthographic projection of the organic isolation 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 isolation 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 isolation column 311b on the substrate may partially overlap with the orthographic projections of the first anode connection electrode 214a and the second anode connection electrode 214b on the substrate, and does not overlap with the orthographic projection of the third anode connection electrode 214c on the substrate. However, this embodiment is not limited thereto. In some other examples, the orthographic projection of the organic isolation column 311b on the substrate may partially overlap with the orthographic projection of the third anode connection electrode 214c on the substrate.

[0095] In some examples, as Figure 2 and Figure 3 shown, the length of the organic isolation column 311a along the second direction Y may 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 and the length of the second anode 211b of the second light-emitting element 21b along the second direction Y may be substantially the same. The length of the organic isolation column 311b along the first direction X may 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 isolation column 311b along the first direction X may be greater than or equal to the sum of the lengths of the first anode 211a of the first light-emitting element 21a and the second anode 211b of the second light-emitting element 21b along the first direction X. However, this embodiment is not limited thereto.

[0096] In some examples, as Figure 2 and Figure 3As shown, the organic isolation pillar 311a may include: a stacked first isolation layer 3111 and a second isolation layer 3112. The second isolation layer 3112 may be located on a side of the first isolation layer 3111 away from the substrate. A positive projection of the second isolation layer 3112 on the substrate may be within a positive projection range of the first isolation layer 3111 on the substrate. In other words, the positive projection of the first isolation layer 3111 on the substrate may cover the positive projection of the second isolation layer 3112 on the substrate. A length of the first isolation layer 3111 of the organic isolation pillar 311a (e.g., a length along the second direction Y) may be greater than a length of the second isolation layer 3112, and a width of the first isolation layer 3111 (e.g., a length along the first direction X) may be greater than a width of the second isolation layer 3112. A structure of the organic isolation pillar 311b is similar to that of the organic isolation pillar 311a, and thus will not be described herein again. However, this embodiment is not limited thereto. In some other examples, the positive projection of the first isolation layer 3111 on the substrate may coincide with the positive projection of the second isolation layer 3112 on the substrate, or the positive projection of the second isolation layer 3112 on the substrate may cover the positive projection of the first isolation layer 3111 on the substrate.

[0097] In some examples, as Figure 2 and Figure 3 shown, on a plane parallel to the display substrate, the display area AA may further include: a plurality of support pillars 41. The plurality of support pillars 41 may be independently arranged. A positive projection of the support pillar 41 on the substrate may be substantially rectangular. The plurality of support pillars 41 may be configured to support the FMM during the evaporation process. The support pillar 41 may be disposed within an interval between adjacent first light-emitting elements 21c. For example, within each row of the third light-emitting elements 21c, one support pillar 41 may be disposed between every two separated third light-emitting elements 21c. Between two adjacent support pillars 41 that are aligned in the second direction Y, there may be an interval of three rows of light-emitting elements (including one row of the third light-emitting elements and two rows of light-emitting elements including the first light-emitting elements and the second light-emitting elements). However, this embodiment is not limited to the setting position of the support pillars.

[0098] Figure 5 For Figure 3 a partial cross-sectional schematic view along the Q1-Q1' direction in. Hereinafter, the cross-sectional structure of the organic isolation pillar 311a will be taken as an example for description. In some examples, as Figure 5As shown, 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 a packaging structure layer provided 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, the plurality of pixel circuits and the plurality of light-emitting elements may be electrically connected in one-to-one correspondence, or one 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 thereto.

[0099] In some examples, the pixel circuit may include a plurality of transistors and at least one storage capacitor. For example, the circuit structure layer 11 may include: a semiconductor layer provided on the substrate, 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 planarization layer, a second source / drain metal layer, and a second planarization layer. The semiconductor layer may include: an active layer of a plurality of transistors of the pixel circuit, the first gate metal layer may include: gates of the plurality of 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: source and drain electrodes of the plurality of transistors, and the second source / drain metal layer may include: a plurality of connection electrodes connected to the anode layer. However, this embodiment is not limited thereto. In some other examples, the circuit structure layer may include: a first semiconductor layer provided on the substrate, 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 planarization layer, a second source / drain metal layer, and a second planarization layer. In some other examples, the circuit structure layer may include: a first semiconductor layer provided on the substrate, 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 planarization layer, a second source / drain metal layer, a second planarization layer, a third source / drain metal layer, and a third planarization layer.

[0100] In some examples, as Figure 5 shown, 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 a plurality of light-emitting elements (for example, a first anode 211a of a first light-emitting element 21a, a second anode 211b of a second light-emitting element 21b), and a plurality of anode connection electrodes (for example Figure 4 the first anode connection electrode 214a, the second anode connection electrode 214b, and the third anode connection electrode 214c shown).

[0101] In some examples, as Figure 5 shown, the pixel definition layer 24 may be provided with a plurality of pixel openings (for example, including 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 partial surface of the first anode 211a. The pixel definition layer 24 within the second pixel opening K2 may be removed to expose a partial surface of the second anode 211b. The pixel definition layer within the third pixel opening may be removed to expose a partial surface of the third anode 211c.

[0102] In some examples, as Figure 5 shown, the light-emitting functional layer may include: the light-emitting functional layer 213a of the first light-emitting element 21a, the light-emitting functional layer 213b of the second light-emitting element 21b, and the light-emitting functional layer of the third light-emitting element 21c. The light-emitting functional layer located in the light-emitting region of the light-emitting element may be in contact with the corresponding anode of the anode layer through the pixel opening. The light-emitting functional layers of adjacent light-emitting elements emitting different colors of light are separated by an organic isolation column. 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 the organic isolation column 311a, so that the light-emitting functional layer 213a and the light-emitting functional layer 213b respectively form a partition portion 2131, and an ineffective functional layer 213d is formed between the light-emitting functional layer 213a and 213b. The partition portion 2131 may include: a surface facing the substrate, a surface away from the substrate, and a side surface connecting the surface facing the substrate and the surface away from the substrate. The surface of the partition portion 2131 facing the substrate may be in contact with the first isolation layer 3111, and the orthographic projection on the substrate of the partition portion 2131 and the orthographic projection on the substrate of the first isolation layer 3111 of the organic isolation column 311a may partially overlap, and may have no overlap with the orthographic projection on the substrate of the second isolation layer 3112. There may be a first gap F1 between the side surface of the partition portion 2131 and the second isolation layer 3112. The ineffective functional layer 213d may be in contact with the second isolation layer 3112, and the orthographic projection on the substrate of the ineffective functional layer 213d and the orthographic projection on the substrate of the second isolation layer 3112 may at least partially overlap.

[0103] In some examples, as Figure 5As shown, the cathode layer may include: cathodes of a plurality of light-emitting elements (for example, the cathode 212a of the first light-emitting element 21a, the cathode 212b of the second light-emitting element 21b, and the cathode of the 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 different colors of light may be separated by an organic isolation column. For example, an ineffective cathode block 212d may be provided between the cathode 212a of the first light-emitting element 21a and the cathode 212b of the second light-emitting element 21b. The ineffective cathode block 212 may be in contact with the ineffective functional layer 213d, and the orthographic projection of the ineffective cathode block 212 on the substrate may at least partially overlap the orthographic projection of the second isolation layer 3112 on the substrate. The orthographic projections of the cathode 212a of the first light-emitting element 21a and the cathode 212b of the second light-emitting element 21b on the substrate may partially overlap the orthographic projection of the first isolation layer 3111 on the substrate. In this example, the light-emitting region of the light-emitting element may refer to the overlapping region of the anode, the light-emitting functional layer, and the cathode of the light-emitting element corresponding to the pixel opening.

[0104] In some examples, as Figure 5 shown, the organic isolation column 311a may be located on the surface of the pixel defining layer 24 away from the substrate 10. The orthographic projection of the organic isolation column 311a on the substrate may be within the orthographic projection of the pixel defining layer 24 on the substrate. In other words, the orthographic projection of the pixel defining layer 24 on the substrate may cover the orthographic projection of the organic isolation column 311a on the substrate. The orthographic projection of the first isolation layer 3111 of the organic isolation column 311a on the substrate may cover the orthographic projection of the second isolation layer 3112 on the substrate.

[0105] In some examples, as Figure 5 shown, the first isolation layer 3111 of the organic isolation 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 close to the substrate 10, and the first side surface 331 may face the second side surface 332. In a plane perpendicular to the extending direction of the organic isolation column 311a and perpendicular to the substrate, the cross-sectional shape of the first isolation layer 3111 may be generally an inverted trapezoid, for example, may be generally an inverted isosceles trapezoid. The size of the first top surface 322 may be larger than the size of the first bottom surface 321. The orthographic projection of the first top surface 322 on the substrate may cover 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 with 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.

[0106] In some examples, asFigure 5 As shown, a first included angle a1 may be formed between the first side surface 331 and the first top surface 322, and a second included angle a₂ may be formed between the second side surface 332 and the first top surface 322. The first included angle a1 and the second included angle a2 may be substantially the same. For example, the first included angle a1 and the second included angle a2 may be greater than or equal to 55 degrees and less than or equal to 75 degrees, for example, may be greater than or equal to 60 degrees and less than or equal to 70 degrees. However, this embodiment is not limited thereto. In some other examples, the first included angle a1 may be different from the second included angle a2.

[0107] In some examples, such as Figure 5As shown, the second isolation layer 3112 of the organic isolation pillar 311a may include: a second bottom surface 323, a second top surface 324, a third side surface 333 and a fourth side surface 334 connecting the second bottom surface 331 and the second top surface 332. 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 extending direction of the organic isolation pillar 311a and perpendicular to the substrate, the cross-sectional shape of the second isolation layer 3112 may be generally trapezoidal in reverse, for example, may be generally an inverted isosceles trapezoid. The size of the second top surface 324 may be larger than the size of the second bottom surface 323, the size of the second bottom surface 323 may be smaller than the size of the first top surface 322, and the size of the first top surface 322 may be larger than the size of the second top surface 324. The orthographic projection of the first top surface 322 on the substrate may cover 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 cover the orthographic projection of the second bottom surface 323 on the substrate. In other words, the bottom size of the first isolation layer 3111 may be smaller than the top size, the bottom size of the second isolation layer 3112 may be smaller than the top size, and the top size of the first isolation layer 3111 may be larger than the bottom size and the top size 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 with 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 second top surface 324 on the substrate, and may also be greater than the length of the orthographic projection of the second bottom surface 323 on the substrate. The length of the orthographic projection of the second top surface 324 on the substrate may be greater than the length of the orthographic projection of the second bottom surface 323 on the substrate; 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 second top surface 324 on the substrate, and may also be greater than the width of the orthographic projection of the second bottom surface 323 on 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 may form a stepped surface and be in contact with 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 be in contact with 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 is not in contact with either the second bottom surface 323 or the side surfaces of the second isolation layer 3112. There is a first gap F1 between the side surface of the partition portion 2131 and the side surfaces of the second isolation layer 3112 (for example, including the third side surface 333 and the fourth side surface 334).

[0108] In some examples, such as Figure 5As shown, a third included angle a3 can be formed between the third side surface 333 and the second top surface 324, and a fourth included angle a4 can be formed between the fourth side surface 334 and the second top surface 324. The third included angle a3 and the fourth included angle a4 can be substantially the same. The third included angle a3 can be the same as the first included angle a1, and the fourth included angle a4 can be the same as the second included angle a2. For example, the third included angle a3 and the fourth included angle a4 can be greater than or equal to 55 degrees and less than or equal to 75 degrees, for example, can be greater than or equal to 60 degrees and less than or equal to 70 degrees. However, this embodiment is not limited thereto. In some other examples, the third included angle a3 can be different from the fourth included angle a4. In some other examples, the first included angle a1, the second included angle a2, the third included angle a3, and the fourth included angle a4 can be different from each other, or can be partially the same.

[0109] In some examples, the midline of the organic isolation column 311a along the first direction X can coincide with the midline 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 isolation column 311a can be centrally disposed within the interval between the first light-emitting element 21a and the second light-emitting element 21b. However, this embodiment is not limited thereto. In some other examples, the midline of the organic isolation column 311a along the first direction X can be located on the side of the midline 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 can be located on the side of the midline 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.

[0110] In some examples, the midline of the first isolation layer 3111 of the organic isolation column 311a along the first direction X and the midline of the second isolation layer 3112 along the first direction X can be substantially coincident. However, this embodiment is not limited thereto. For example, there can be a dislocation with a certain distance between the midline of the first isolation layer 3111 of the organic isolation column 311a along the first direction X and the midline of the second isolation layer 3112 along the first direction X.

[0111] In some examples, such as Figure 5As shown, there is a first distance between the edge of the first side 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 between the edge of the second side 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 can be the same. The organic isolation column 311a can be located in the middle of the first light-emitting element 21a and the second light-emitting element 21b. In some other examples, the first distance can be greater than the second distance. The organic isolation column 311a can be disposed close to the first light-emitting element 21b. In some other examples, the first distance can be less than the second distance. The organic isolation column 311a can be disposed close to the first light-emitting element 21a. This embodiment does not limit this.

[0112] In some examples, as Figure 5 shown, 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, and 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 range of the thickness h1 of the first isolation layer 3111 can be from 0.2 micrometers to 1.1 micrometers. For example, h1 can be 0.2 micrometers, 0.8 micrometers, or 1.1 micrometers. The range of the thickness h2 of the second isolation layer 3112 can be from 1.2 micrometers to 1.6 micrometers. For example, h2 can be 1.2 micrometers, 1.5 micrometers, or 1.6 micrometers.

[0113] This example uses an organic isolation column with a double-layer inverted trapezoidal cross-sectional 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, it is easier to be cut off at the bottom corner position of the second isolation layer of the organic isolation column to form an "undercut" structure, which can further block the lateral leakage current between adjacent light-emitting elements and improve the crosstalk between adjacent light-emitting elements.

[0114] In some examples, the support column can be disposed on the same layer as the pixel definition layer. Among them, the material of the support column can be the same as that of the pixel definition layer and different from the material of the organic isolation column. For example, the material of the organic isolation column can be a negative photoresist, and the materials of the support column and the pixel definition layer can be a positive photoresist.

[0115] In some examples, the minimum height of the support pillar can be greater than the maximum height of the organic isolation pillar. The height of the support pillar can refer to the vertical distance between the surface of the support pillar away from the substrate and the substrate surface. The height of the organic isolation pillar can refer to the vertical distance between the second top surface and the substrate surface. In some examples, the thickness range of the support pillar can be from 1.5 micrometers to 3.0 micrometers, such as about 2.3 micrometers to 2.5 micrometers, for example, it can be 2.3 micrometers or 2.5 micrometers. By setting the minimum height of the support pillar to be greater than the maximum height of the organic isolation pillar in this example, the situation where the FMM rubs against the organic isolation pillar can be reduced.

[0116] Figure 6 For Figure 5 Partial enlarged schematic diagram of region A3 in. In some examples, such as Figure 6 As shown, the light-emitting functional layer 213a of the first light-emitting element 21a can 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 can be an N-type charge generation layer (N-CGL), and the second charge generation layer 2135b can be a P-type charge generation layer (P-CGL). The first charge generation layer 2135a and the second charge generation layer 2135b can have strong conductivity, so that the light-emitting functional layer has the advantages of long life, low power consumption, and high brightness. For example, compared with the light-emitting functional layer without a charge generation layer, by setting a charge generation layer in the light-emitting functional layer, the light-emitting brightness of the light-emitting element can be increased by nearly one time.

[0117] 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 thereto. 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 setting 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, and the color of the light emitted by each light-emitting element can be adjusted by setting a color film layer.

[0118] In some examples, the first hole transport layer 2132a, the first hole blocking layer 2133a, the first charge generation layer 2135a, the second charge generation layer 2135b, the second hole transport layer 2132b, the second hole blocking layer 2133b, and the electron transport layer 2134 can be common layers (i.e., shared film layers) for multiple light-emitting elements. The common layers of adjacent light-emitting elements emitting different colors of light can be separated by organic isolation pillars. However, this embodiment is not limited thereto. In other examples, only the first charge generation layer, the second charge generation layer, the first hole transport layer, and the second hole transport layer can be set as common layers; or only the first charge generation layer and the second charge generation layer can be set as common layers.

[0119] In some examples, as Figure 5 shown, the ineffective functional layer 213d can be located between the partition portions of the light-emitting functional layers of adjacent light-emitting elements emitting different colors of light, contact the second top surface 324 of the second isolation layer 3112 of the organic isolation pillar 311a, and may not contact the side surface of the second isolation layer 3112 and the first isolation layer 3111. In this example, by providing an organic isolation pillar having a certain height and an inverted conical cross-section, the light-emitting functional layers of adjacent light-emitting elements emitting different colors of light can be separated, thereby separating the leakage current path between adjacent light-emitting elements and improving the crosstalk problem.

[0120] In some examples, as Figure 5 shown, the encapsulation structure layer can include: a stacked first encapsulation layer 421, a second encapsulation layer, and a third encapsulation layer. The first encapsulation layer 421 can be made of an inorganic material and cover the cathode layer in the display area. The second encapsulation layer can be made of an organic material, and the third encapsulation layer can be made of an inorganic material and cover the first encapsulation layer 421 and the second encapsulation layer. However, this embodiment is not limited thereto. In other examples, the encapsulation structure layer can adopt a five-layer structure of inorganic / organic / inorganic / organic / inorganic.

[0121] In some examples, as Figure 5 shown, 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 pillar 311a, thereby ensuring effective contact between the first encapsulation layer 421 and the organic isolation pillar 311a, increasing the contact area, and being beneficial to reducing the risk of film peeling that the first encapsulation layer is prone to.

[0122] The light-emitting elements of the display substrate in this example adopt a Tandem structure, using a charge generation layer as a heterojunction layer to connect two light-emitting layers in series. This enables a significant reduction in the light-emitting current of the light-emitting elements under the same light-emitting intensity, improves the power consumption and lifespan of the display product, and meets the brightness requirements of users. When there is crosstalk caused by lateral leakage current between light-emitting elements emitting different colors of light, by arranging an organic isolation pillar including two isolation layers and having an inverted conical shape in the interval between light-emitting elements emitting different colors of light, the lateral leakage current path of the light-emitting functional layers of adjacent light-emitting elements emitting different colors of light can be truncated, thus effectively improving the crosstalk problem. For the display substrate in this example, without reducing the conductivity of the common layer (such as including a charge generation layer), the power consumption of the display substrate can be ensured, thereby enhancing the display effect. Additionally, there is a first gap between the second isolation layer of the organic isolation pillar in 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 pillar, facilitating the reduction of the risk of film peeling of the first encapsulation layer.

[0123] The organic isolation structure of the display substrate in this example will be described below through an example of the manufacturing process of the display substrate. The "patterning process" as mentioned in this disclosure, for metal materials, inorganic materials, or transparent conductive materials, includes processes such as coating photoresist, mask exposure, development, etching, and photoresist stripping. For organic materials, it includes processes such as coating organic materials, mask exposure, and development. Deposition can be carried out using any one or more of sputtering, evaporation, and chemical vapor deposition. Coating can be carried out using any one or more of spraying, spin coating, and inkjet printing. Etching can be carried out using any one of dry etching and wet etching. This disclosure does not make any limitations. A "thin film" refers to a thin film made of a certain material on a substrate using deposition, coating, or other processes. If the "thin film" does not require a patterning process throughout the manufacturing process, the "thin film" can also be referred to as a "layer". If the "thin film" requires a patterning process throughout the manufacturing process, it is called 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.

[0124] Figure 7 It is a schematic diagram of the preparation of the organic isolation structure according to at least one embodiment of this disclosure. In some examples, as Figure 7 shown, after preparing the circuit structure layer 11 on the substrate 10, an anode thin film is deposited on the substrate 10 on which the circuit structure layer 11 is formed, and the anode thin film is patterned through a patterning process to form an anode layer. The anode layer can be as Figure 4As shown, it may include, for example, anodes of a plurality of 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 a plurality of anode connection electrodes.

[0125] Subsequently, a pixel definition film is coated and patterned through a patterning process to form a pixel definition layer 24 and a plurality of support pillars. 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 partial surface of the first anode 211a, and the second pixel opening K2 may expose a partial surface of the second anode 211b. The support pillars may be located within the interval between adjacent light-emitting elements that emit light of the same color. The thickness of the support pillars may be greater than the thickness of the pixel definition layer, for example. However, this embodiment is not limited thereto. In some other examples, the support pillars and the pixel definition layer may be prepared through different steps. In some examples, the material of the pixel definition film may be a positive photoresist.

[0126] Subsequently, a first photoresist is coated to form a first photoresist layer, and the first photoresist layer is exposed and developed using a halftone mask (HTM, Halftone Mask) to form organic isolation pillars. The halftone mask may include a first light-transmitting region, a second light-transmitting region, and a light-shielding region. The light transmittance of the first light-transmitting region may be greater than that of the second light-transmitting region. For example, the light transmittance of the first light-transmitting region may be 100%, the light transmittance of the second light-transmitting region may be less than 50%, and the light transmittance of the light-shielding region may be 0. By exposing the first photoresist layer using the halftone mask, the exposed first photoresist layer forms a first exposed region corresponding to the first transparent region, a second exposed region corresponding to the second light-transmitting region, and a non-exposed region corresponding to the light-shielding region. The exposed first photoresist layer is developed to remove the first photoresist layer in the first exposed region, and the second exposed region forms a non-overlapping part of a first isolation layer 3111 and a second isolation layer 3112, and the non-exposed region forms an overlapping part of the first isolation layer 3111 and the second isolation layer 3112. In some examples, the first photoresist may be a negative photoresist.

[0127] This example can use a halftone mask to prepare organic isolation pillars through a single patterning process to form a stacked structure in which a first isolation layer and a second isolation layer are stacked, which can simplify the preparation steps.

[0128] Figure 8 Another preparation schematic diagram of the organic isolation structure according to at least one embodiment of the present disclosure. In some examples, as ​As shown, after preparing the pixel definition layer 24, the first isolation layer 3111 and the second isolation layer 3112 of the organic isolation column 311a can be sequentially formed through two patterning processes.

[0129] In some examples, a second photoresist is coated on the substrate 10 of the pixel definition layer 24 to form a second photoresist layer, and a patterning process is performed on the second photoresist layer using a first mask to form the first isolation layer 3111. Subsequently, a third photoresist is coated to form a third photoresist layer, and a patterning process is performed on the third photoresist layer using a second mask to form the second isolation layer 3112. In some examples, the second photoresist and the third photoresist can be negative photoresists. For the remaining preparation steps of this example, reference can be made to the description of the foregoing embodiments, so they will not be elaborated here.

[0130] In other examples, a second photoresist is coated on the substrate 10 of the pixel definition layer 24 to form a second photoresist layer, and a patterning process is performed on the second photoresist layer using a third mask with a first exposure amount to form the first isolation layer 3111. Subsequently, a third photoresist is coated to form a third photoresist layer, and a patterning process is performed on the third photoresist layer using the third mask with a second exposure amount to form the second isolation layer 3112. Among them, 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 savings. For the remaining preparation steps of this example, reference can be made to the description of the foregoing embodiments, so they will not be elaborated here.

[0131] ​ is ​ Another partial cross-sectional schematic diagram along the Q1-Q1' direction in. In some examples, such as ​As shown, the light-emitting functional layers of adjacent light-emitting elements emitting different-color light are separated by organic isolation pillars. 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 the organic isolation pillar 311a, so that the light-emitting functional layer 213a and the light-emitting functional layer 213b respectively form a separation part 2131, and an ineffective functional layer 213d is formed between the light-emitting functional layer 213a and 213b. The separation part 2131 may include: a surface facing the substrate, a surface away from the substrate, and a side surface connecting the surface facing the substrate and the surface away from the substrate. The surface of the separation part 2131 facing the substrate may be in contact with the first isolation layer 3111, and the orthographic projection of the substrate and the orthographic projection of the first isolation layer 3111 of the organic isolation pillar 311a on the substrate may partially overlap. The side surface of the separation part 2131 is in direct contact with the side surface of the second isolation layer 3112 without forming a gap. The first encapsulation layer 421 is in contact with the organic isolation pillar 311a only on the side surface of the second isolation layer 3112. In this example, by providing an organic isolation pillar including two isolation layers and having an inverted conical shape, the lateral leakage current path of the light-emitting functional layers of adjacent light-emitting elements emitting different-color light can be truncated, thereby effectively improving the crosstalk problem. For the remaining description of the display substrate in this example, reference may be made to the description of the foregoing embodiments, and thus it will not be elaborated herein.

[0132] ​ For ​ Another partial cross-sectional schematic diagram along the Q1-Q1' direction in. In some examples, as ​ shown, the pixel definition layer 24 may be provided with a plurality of pixel openings and a first isolation groove V1. The first isolation groove V1 may be located within the interval between adjacent light-emitting elements emitting different-color light. The pixel definition layer 24 within the first isolation groove V1 may be removed, exposing 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 may be exposed. The orthographic projection of the first isolation groove V1 on the substrate and the orthographic projection of the anode layer on the substrate may have no overlap. The organic isolation pillar 311a may be located within the first isolation groove V1. The organic isolation pillar 311a may be in direct contact with the side wall of the first isolation groove V1. The bottom surface size of the first isolation groove V1 may be substantially the same as the size of the first bottom surface of the organic isolation pillar 311a.

[0133] In some examples, within the interval 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 may be formed on the pixel definition layer 24, the first top surface and the side surface of the first isolation layer 3111 of the organic isolation pillar 311a. The first isolation groove V1 may be completely covered by the organic isolation pillar 311a.

[0134] In some examples, multiple first isolation grooves V1 can be independently provided. An organic isolation column 311a or 311b can be provided in each first isolation groove V1. However, this embodiment is not limited thereto. In other examples, multiple first isolation grooves can communicate with each other to form a network structure of the first isolation grooves. Multiple independently provided organic isolation columns can be provided in the network structure, or multiple interconnected organic isolation columns can be provided.

[0135] In some examples, during the preparation of the display substrate, after forming the pixel definition layer having the first isolation grooves, organic isolation columns can be formed in the first isolation grooves. This embodiment is not limited thereto.

[0136] In this example, by forming the first isolation grooves in the pixel definition layer and providing the organic isolation columns in the first isolation grooves, the height of the organic isolation columns relative to the support columns for supporting the FMM can be reduced, and the risk of the FMM rubbing against the organic isolation columns to form dark spots can be reduced. Moreover, 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 blocked on the first isolation layer by the second isolation layer of the organic isolation column, truncating the lateral leakage current path of the light-emitting functional layer, thereby improving the crosstalk between light-emitting elements emitting different colors of light. For the remaining structures of this example, reference can be made to the description of the foregoing embodiments, and thus will not be elaborated herein.

[0137] ​ For ​ Another partial cross-sectional schematic view along the Q1-Q1' direction. In some examples, as ​ shown, the pixel definition layer 24 can be provided with multiple pixel openings and first isolation grooves V1. The first isolation grooves V1 can be located within the interval between adjacent light-emitting elements emitting different colors of light. The pixel definition layer 24 within the first isolation grooves 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 flat layer away from the substrate can be exposed. The orthographic projection of the first isolation grooves V1 on the substrate and the orthographic projection of the anode layer on the substrate can have no overlap. The organic isolation column 311a can be located within the first isolation grooves V1. The orthographic projection of the organic isolation column 311a on the substrate and the orthographic projection of the pixel definition layer 24 on the substrate can have no overlap. The size of the first isolation grooves V1 can 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 and the edge of the first isolation grooves V1 can have no contact. There can be a second gap F2 between the edge of the first isolation layer 3111 of the organic isolation column 311a and the side wall of the first isolation grooves V1.

[0138] In some examples, within the interval between the first light-emitting element 21a and the second light-emitting element 21b, the light-emitting functional layers 213a of the first light-emitting element 21a and 213b of the second light-emitting element 21b may be formed on the pixel definition layer 24, the first top surface and the side surface of the first isolation layer 3111 of the organic isolation pillar 311a. The partition portion 2131 of the light-emitting functional layers 213a and 213b may be filled in the second gap F2 between the first isolation layer 3111 and the side wall of the first isolation groove V1. There is a first gap F1 between the partition portion 2131 and the side surface of the second isolation layer 3112. The first encapsulation layer 421 may be in contact with 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 pillar, which is beneficial to reducing the risk of film peeling of the first encapsulation layer.

[0139] In this example, by forming a first isolation groove in the pixel definition layer and disposing the organic isolation pillar in the first isolation groove, the height of the organic isolation pillar relative to the support pillar for supporting the FMM can be reduced, and the risk of forming dark spots due to rubbing between the FMM and the organic isolation pillar can be reduced. Moreover, a second gap is formed between the side surfaces of the organic isolation pillar and the first isolation groove where it is located, which can further extend the lateral current path of the light-emitting functional layer and further improve the crosstalk situation between the light-emitting elements emitting different colors of light. For the remaining structures of this example, reference may be made to the description of the foregoing embodiments, and thus will not be elaborated herein.

[0140] ​ For ​ Another partial cross-sectional schematic diagram along the Q1-Q1' direction in. In some examples, such as ​As shown, the pixel definition layer 24 may be provided with a plurality of pixel openings and a first isolation groove V1. The first isolation groove V1 may be located within the interval between adjacent light-emitting elements that emit different colors of light. The pixel definition layer 24 within the first isolation groove V1 may be removed, exposing the surface of the circuit structure layer 11 away from the substrate 10. For example, the surface of the second flat layer away from the substrate may be exposed. The orthographic projection of the first isolation groove V1 on the substrate and the orthographic projection of the anode layer on the substrate may have no overlap. 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 and the orthographic projection of the pixel definition layer 24 on the substrate may have no overlap. 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 and the edge of the first isolation groove V1 may not be in contact. There is a second gap F2 between the edge of the first isolation layer 3111 of the organic isolation column 311a and the side wall of the first isolation groove V1. The partition portion 2131 of the light-emitting functional layers 213a and 213b may be filled in the second gap F2 between the first isolation layer 3111 and the side wall of the first isolation groove V1. There is a first gap F1 between the partition portion 2131 and the side surface of the second isolation layer 3112. The second gap F2 may be larger than the first gap F1. The first encapsulation layer 421 may fill the first gap F1, thereby increasing the effective contact area with the organic isolation column and being beneficial to reducing the risk of film peeling that is likely to occur in the first encapsulation layer.

[0141] In some examples, the top size of the first isolation layer 3111 of the organic isolation column 311a and the top size of the second isolation layer 3112 may be substantially the same and larger than the bottom size of the second isolation layer 3112; or, the top size of the first isolation layer 3111a may be smaller than the top size of the second isolation layer 3112 and larger than the bottom size of the second isolation layer 3112.

[0142] In this example, by reducing the size of the first isolation layer 3111, on the premise of ensuring the 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 situation between the light-emitting elements that emit different colors of light. For the remaining structures of this example, reference may be made to the description of the foregoing embodiments, and thus will not be elaborated herein.

[0143] ​ For ​ Another partial cross-sectional schematic diagram along the Q1-Q1' direction in. In some examples, such as ​As shown, the pixel definition layer 24 may be provided with a plurality of pixel openings and a plurality of second isolation grooves V2. The second isolation grooves V2 may be located within the intervals between adjacent light-emitting elements that emit different-color light. A part of the pixel definition layer 24 within the second isolation grooves V2 may be removed, and a part of the pixel definition layer 24 may be retained. The thickness of the pixel definition layer 24 within the second isolation grooves V2 may be less than the thickness of the surrounding pixel definition layer 24. The organic isolation posts 311a may be located within the second isolation grooves V2. The orthographic projection of the pixel definition layer 24 on the substrate may cover the orthographic projection of the organic isolation posts 311a on the substrate.

[0144] In this example, by thinning the pixel definition layer to form the second isolation grooves and disposing the organic isolation posts within the second isolation grooves, the height of the organic isolation posts relative to the support posts for supporting the FMM can be reduced, and the risk of the FMM rubbing against the organic isolation posts to form dark spots can be reduced. Moreover, a second gap may be formed between the side surfaces of the organic isolation posts and the first isolation grooves where they are located, which can further extend the lateral current path of the light-emitting functional layer and further improve the crosstalk between the light-emitting elements that emit different-color light. For the remaining structures of this example, reference may be made to the description of the foregoing embodiments, and thus will not be elaborated herein.

[0145] ​ For ​ Another partial enlarged schematic view of region A1 in ​ For ​ A partial enlarged schematic view of region A4 in ​ For ​ A partial cross-sectional schematic view along the Q2-Q2' direction in

[0146] In some examples, as ​ and ​ shown, the organic isolation structure 31 may include: a plurality of organic isolation posts 311a and 311b. The plurality of organic isolation posts 311a and 311b may be independently disposed. Two organic isolation posts 311a with the same extending direction may be disposed within 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 isolation posts 311b with the same extending direction may be disposed within the intervals 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 second light-emitting element 21b. The spacing between the two organic isolation posts 311a and the spacing between the two organic isolation posts 311b may be set according to actual requirements. This embodiment does not limit this. In other examples, three or more organic isolation posts with the same extending direction may be disposed within the intervals between adjacent light-emitting elements that emit different-color light.

[0147] In some examples, such as ​ shown, the two organic isolation posts 311a provided within the interval between the first light-emitting element 21a and the second light-emitting element 21b may be located on the pixel definition layer 24. The structures and shapes of the two organic isolation posts 311a may be substantially the same. The structures of the two organic isolation posts 311a in this example may refer to the description of the foregoing embodiments, and thus will not be elaborated herein.

[0148] In this example, by providing two organic isolation posts within the interval between adjacent light-emitting elements emitting different colors of light, and by increasing the number of organic isolation posts, the leakage current path of the light-emitting functional layer within the interval between adjacent light-emitting elements can be further truncated, thereby achieving a good crosstalk isolation effect. The remaining descriptions of this example may refer to the description of the foregoing embodiments, and thus will not be elaborated herein.

[0149] This application describes multiple embodiments, but this description is exemplary rather than restrictive, and it will be obvious to those of ordinary skill in the art that there can be more embodiments and implementation solutions within the scope covered by the embodiments described in this application. Although many possible feature combinations are shown in the drawings and discussed in the embodiments, many other combination ways of the disclosed features are also possible. Unless specifically restricted, any feature or element of any embodiment can be combined with any other feature or element in any other embodiment, or can replace any other feature or element in any other embodiment.

[0150] In some other examples, two organic isolation posts having the same extending direction may be provided within the interval between adjacent light-emitting elements emitting different colors of light, and the two organic isolation posts may be provided in the first isolation groove or the second isolation groove of the pixel definition layer. In some other examples, two organic isolation posts having the same extending direction may be provided within the interval between adjacent light-emitting elements emitting different colors of light, wherein one organic isolation post may be provided in the first isolation groove of the pixel definition layer such that there is no overlap with the orthographic projection of the pixel definition layer on the substrate, and the other organic isolation post may be located on the pixel definition layer. In some other examples, at least two organic isolation posts having the same extending direction may be provided within the interval between adjacent light-emitting elements emitting different colors of light, and the at least two organic isolation posts may be provided in the second isolation groove formed by thinning the pixel definition layer. This embodiment does not limit this.

[0151] The display substrate provided in this embodiment is configured with an organic isolation column in an inverted conical structure for a light-emitting element adopting a Tandem design. By truncating the leakage current path between adjacent light-emitting elements that emit different-color light, crosstalk between adjacent light-emitting elements that emit different-color light can be improved. In some examples, the organic isolation structure is disposed in a first isolation groove formed by removing the pixel definition layer or a second isolation groove formed by thinning the pixel definition layer, which can reduce the height of the organic isolation structure, making the height of the organic isolation structure lower than that of the support column, and avoiding the occurrence of dark spot display defects due to rubbing between the FMM and the organic isolation structure. 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 beneficial to reducing the risk of film peeling that is likely to occur in the first encapsulation layer. In some examples, by providing a second gap between the edge of the organic isolation column and the side wall of the first isolation groove or the second isolation groove where it is located, the lateral current path of the light-emitting functional layer can be further extended, further improving the crosstalk situation between the light-emitting elements that emit different-color light.

[0152] ​ For ​ Another partial enlarged schematic diagram of area A1 in the figure. In some examples, as ​ shown, the multiple light-emitting elements in the display area may include: multiple first light-emitting elements 21a and 21d that emit a first color of light, multiple second light-emitting elements 21b that emit a second color of light, and multiple third light-emitting elements 21c that emit a third color of light. For example, the first color of light may be green light, the second color of light may be red light, and the third color of light may be blue light. This embodiment is not limited thereto.

[0153] In some examples, the multiple light-emitting elements in the display area may be arranged according to the following rules: multiple first light-emitting elements 21a and 21d are alternately arranged in the row direction and the column direction, multiple second light-emitting elements 21b and multiple third light-emitting elements 21c are alternately arranged in the row direction and the column direction, the rows where the first light-emitting elements 21a and 21d are located are arranged at intervals from 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 arranged at intervals from the columns where the second light-emitting elements 21b and the third light-emitting elements 21c are located. For example, the first light-emitting element 21a and the second light-emitting element 21b may be arranged in a straight line with a counterclockwise (or clockwise) angle of 45 degrees with respect to the horizontal line, and the first light-emitting element 21a and the third light-emitting element 21c may be arranged in a straight line with a clockwise (or counterclockwise) angle of 45 degrees with respect to the horizontal line.

[0154] In some examples, as ​As shown, the organic isolation structure may include: a plurality of first groups of organic isolation columns and a plurality of second groups of organic isolation columns. The first group of organic isolation columns may include: four independently arranged organic isolation columns 311g, 311h, 311i, and 311j. The first group of organic isolation columns may be arranged around the second light-emitting element 21b, separating the second light-emitting element 21b from the adjacent first light-emitting element 21a and 21b and the third light-emitting element 21. The second group of organic isolation columns may include two independently arranged organic isolation columns 311m and 311n. The two organic isolation columns 311m and 311n may be located on both sides of the first light-emitting element 21a or 21d, separating the first light-emitting element 21a or 21d from the adjacent third light-emitting element 21c. However, this embodiment is not limited thereto. For example, two adjacent organic isolation columns in the first group of organic isolation columns may be connected to each other.

[0155] The structure of the organic isolation columns in this example and the remaining structure of the display region may refer to the description of the foregoing embodiments, and thus will not be described in detail herein. The structure (or method) shown in this embodiment may be appropriately combined with the structure (or method) shown in other embodiments.

[0156] ​ For ​ Another partial enlarged schematic diagram of region A1 in the figure. In some examples, as ​ shown, the multiple light-emitting elements in the display region may include: a plurality of first light-emitting elements 21a that emit first-color light, a plurality of second light-emitting elements 21b that emit second-color light, and a plurality of third light-emitting elements 21c that emit third-color light. For example, the first-color light may be green light, the second-color light may be red light, and the third-color light may be blue light. This embodiment is not limited thereto.

[0157] In some examples, multiple light-emitting elements in the display area may be arranged according to the following rule: on 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. The two first light-emitting elements 21a in the repeating unit are arranged in the column direction; among the light-emitting elements in different rows, the distance between the light-emitting elements emitting the same color light in the row direction is approximately equal to 1.5 times the width of the light-emitting element. In this example, the widths of the first light-emitting element 21a, the second light-emitting element 21b, and the third light-emitting element 21c in the row direction may be the same. In other words, the repeating units between adjacent rows may have a shift of 1.5 times the width of the light-emitting element in the row direction. The orthographic projections of the light-emitting regions of the two first light-emitting elements 21a on the substrate may both be pentagons (such as rounded pentagons). The two first light-emitting elements 21a may be symmetric to each other, and the axis of symmetry may be parallel to the row direction. The orthographic projections of the light-emitting regions of the second light-emitting element 21b and the third light-emitting element 21c on the substrate may both be hexagons (such as rounded hexagons). The lengths of the second light-emitting element 21b and the third light-emitting element 21c in the column direction may be the same. The length of the first light-emitting element 21a in the column direction may be less than the length of the second light-emitting element 21b in the column direction. In this example, the row direction may be parallel to the first direction X, and the column direction may be parallel to the second direction Y.

[0158] In some examples, as ​ shown, the organic isolation structure 31 may include: multiple independently provided organic isolation columns 311a and 311c. The organic isolation column 311a may extend along the second direction Y, and the organic isolation column 311c may be substantially zigzag. An organic isolation column 311a may be provided between adjacent first light-emitting elements 21a and second light-emitting elements 21b, an organic isolation column 311a may be provided between adjacent first light-emitting elements 21a and third light-emitting elements 21c, and multiple organic isolation columns 311c arranged in sequence along the first direction X may be provided between the light-emitting elements emitting different color lights between adjacent rows. No organic isolation structure may be provided between the two first light-emitting elements 21a within one repeating unit. However, this embodiment is not limited thereto. In some other examples, some adjacent organic isolation columns may be connected to each other.

[0159] The structure of the organic isolation column in this example and the rest of the structure of the display area may refer to the description of the foregoing embodiments, so it will not be elaborated here. The structure (or method) shown in this embodiment may be appropriately combined with the structure (or method) shown in other embodiments.

[0160] ​ For ​ another partial enlarged schematic diagram of area A1 in the figure. In some examples, as ​As shown, multiple light-emitting elements in the display area can be arranged as follows: They are arranged in a repeating unit of one second light-emitting element 21b, one first light-emitting element 21a, and one third light-emitting element 21c on each row. 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 generally rectangular (e.g., a rounded rectangle). The widths of the light-emitting elements that emit different colors of light in the row direction can be substantially the same, and the lengths of the light-emitting elements that emit different colors of light in the column direction can be substantially the same.

[0161] In some examples, as ​ shown, the organic isolation structure 31 can include: a plurality of organic isolation columns 311a that are independently arranged and extend along the second direction Y. One organic isolation column 311a can be provided between adjacent columns of the light-emitting elements that emit different colors of light. In this example, by providing organic isolation columns between adjacent light-emitting elements that emit different colors of light, the situation where other color light-emitting elements are lit during monochromatic display can be avoided, thereby improving the display effect.

[0162] The structure of the organic isolation column in this example and the remaining structure of the display area can refer to the description of the foregoing embodiments, so it will not be elaborated here. The structure (or method) shown in this embodiment can be appropriately combined with the structure (or method) shown in other embodiments. For example, two organic isolation columns with the same extension direction can be provided between adjacent columns of the light-emitting elements that emit different colors of light.

[0163] ​ For ​ another partial enlarged schematic diagram of area A1 in the middle. In some examples, as ​ shown, multiple light-emitting elements in the display area can be arranged as follows: Taking one third light-emitting element 21c, one second light-emitting element 21b, and one first light-emitting element 21a as a repeating unit, they are arranged in sequence along the row direction; among adjacent row light-emitting elements, the interval of the light-emitting elements that emit the same color of light in the row direction is approximately equal to one time 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 in the row direction can be substantially the same, and the lengths in the column direction can be substantially 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.

[0164] In some examples, as ​As shown, the organic isolation structure 31 may include: a plurality of independently provided organic isolation columns 311a extending along the second direction Y and a plurality of organic isolation columns 311b extending along the first direction X. The organic isolation columns 311a may be located between adjacent light-emitting elements that emit different colors of light along the first direction X, and the organic isolation columns 311b may be located between adjacent light-emitting elements that emit different colors of light along the second direction Y. However, this embodiment is not limited thereto. In some other examples, some adjacent organic isolation columns may be connected to each other.

[0165] The structure of the organic isolation columns in this example and the remaining structure of the display area may refer to the description of the foregoing embodiments, and thus will not be elaborated herein. The structure (or method) shown in this embodiment may be appropriately combined with the structure (or method) shown in other embodiments.

[0166] ​ For ​ another partial enlarged schematic view of area A1 in the figure. In some examples, as ​ shown, a plurality of light-emitting elements in the display area may 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 used as a repeating unit and arranged in sequence along the row direction; among adjacent row light-emitting elements, the interval between light-emitting elements that emit the same color of light in the row direction 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 in the row direction may be substantially the same, and the lengths in the column direction may be substantially the same. For example, the first light-emitting element 21a may be configured to emit green light, the second light-emitting element 21b may be configured to emit red light, and the third light-emitting element 21c may be configured to emit blue light.

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

[0168] The structure of the organic isolation columns in this example and the remaining structure of the display area may refer to the description of the foregoing embodiments, and thus will not be elaborated herein. The structure (or method) shown in this embodiment may be appropriately combined with the structure (or method) shown in other embodiments.

[0169] This embodiment also provides a method for manufacturing a display substrate, including: providing a substrate; forming an organic isolation structure and a plurality of light-emitting elements on the substrate. Among them, the organic isolation structure includes: a plurality of organic isolation columns, and at least one of the plurality of organic isolation columns is located in the interval between the light-emitting regions of at least two adjacent light-emitting elements that emit different colors of light; the at least one organic isolation column includes: a first isolation layer and a second isolation layer stacked, and the second isolation layer is 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, and the first bottom surface is located on the side of the first top surface close to the substrate. The second isolation layer includes: a second bottom surface and a second top surface, the second bottom surface is located on the 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.

[0170] In some exemplary embodiments, forming the organic isolation structure on the substrate may include one of the following: forming the organic isolation column using a halftone mask, and the first isolation layer and the second isolation layer of the organic isolation column are an integrally connected 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; forming the first isolation layer and the second isolation layer of the organic isolation column sequentially through two patterning processes using a third mask, and the exposure amounts of the two patterning processes are different.

[0171] For the method for manufacturing the display substrate of this example, reference may be made to the description of the foregoing embodiments, so it will not be elaborated here.

[0172] ​ Schematic diagram of a display device according to at least one embodiment of the present disclosure. As ​As shown, this embodiment provides a display device 91, including the display substrate 910 of the foregoing 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 with an image (including static images or dynamic images, where the dynamic images may be videos) display function. For example, the display device may be any one of the following products: a monitor, 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 video camera, a viewfinder, a navigator, a vehicle, a large-area wall, an information query device (such as a business query device in departments such as e-government, banks, hospitals, and power), a monitor, etc. Another example is that the display device may also be a microdisplay, or any one of products such as a VR device or an AR device including a microdisplay.

[0173] The drawings in this disclosure only relate to the structures involved in this disclosure, and other structures may refer to the usual designs. Without conflict, the embodiments of this disclosure, that is, the features in the embodiments, may be combined with each other to obtain new embodiments. It should be noted that the above embodiments or implementation manners are merely exemplary and not restrictive. Therefore, this disclosure is not limited to the content shown and described in detail herein. Various modifications, substitutions, or omissions may be made to the form and details of the implementation without departing from the scope of this disclosure.

Claims

1. A display substrate, characterized in that, 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, and at least one of the plurality of organic isolation columns is located in an interval between light-emitting regions of at least two adjacent light-emitting elements that emit different colors of light; the at least one organic isolation column includes: a first isolation layer and a second isolation layer stacked, and 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, and 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, and 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; a positive projection of the first top surface on the substrate covers a positive projection of the first bottom surface on the substrate, a positive projection of the second top surface on the substrate covers a positive projection of the second bottom surface on the substrate, and a positive projection of the first top surface on the substrate covers a positive projection of the second bottom surface on the substrate.

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

3. The display substrate according to claim 1, characterized in that, The light-emitting element includes: a light-emitting functional layer, and the light-emitting functional layer at least includes: 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 a side of the organic isolation structure away from the substrate, and a positive projection of the light-emitting functional layer on the substrate at least partially overlaps with a positive projection of the organic isolation structure on the substrate.

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

5. The display substrate according to claim 3, wherein Light-emitting functional layers of adjacent light-emitting elements that emit different colors of light are separated by the organic isolation columns.

6. The display substrate according to claim 5, wherein The light-emitting functional layer includes: a partition portion formed by being separated by the organic isolation column; there is a first gap between the partition portion and 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; the display substrate further includes: a first encapsulation layer located on a side of the plurality of 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 being separated 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.

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 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.

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 integrally connected structure.

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

11. The display substrate according to claim 1, wherein The light-emitting element includes: a first electrode, a light-emitting functional layer, and a second electrode stacked thereon, and the first electrode is located on the side of the second electrode close to the substrate; The display substrate further includes: a pixel defining layer located on the side of the first electrode of the light-emitting element away from the substrate, the pixel defining layer is provided with a pixel opening, and the light-emitting functional layer is in contact with the first electrode through the pixel opening; the organic isolation structure is located on the side of the pixel defining layer away from the substrate; The orthographic projection of the pixel defining 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 includes: a first electrode, a light-emitting functional layer, and a second electrode stacked thereon, and the first electrode is located on the side of the second electrode close to the substrate; The display substrate further includes: a pixel defining layer located on the side of the first electrode of the light-emitting element away from the substrate, the pixel defining layer is provided with a pixel opening, and the light-emitting functional layer is in contact with the first electrode through the pixel opening; The orthographic projection of the pixel defining 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 defining 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 defining layer is provided with at least one first isolation groove, and at least one organic isolation column of the organic isolation structure is disposed 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; there is a second gap between the organic isolation column disposed in the first isolation groove and the sidewall of the first isolation groove; the light-emitting functional layer is in contact with the sidewall of the first isolation groove.

14. The display substrate according to claim 12, wherein The pixel defining layer is provided with at least one first isolation groove, and at least one organic isolation column of the organic isolation structure is disposed 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 disposed in the first isolation groove is in contact with the sidewall of the first isolation groove.

15. The display substrate according to claim 1, wherein Between the light-emitting regions of at least two adjacent light-emitting elements emitting different colors of light, at least two adjacent organic isolation columns with the same extending direction are provided.

16. The display substrate according to claim 1, wherein The display substrate further includes: a plurality of support columns, and at least one of the plurality of support columns is located in the interval between the light-emitting regions of two adjacent light-emitting elements emitting the same color of light; the maximum height of the organic isolation 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 support column is different from the material of the organic isolation column.

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

19. A display device, characterized in that, A display substrate as described in any one of claims 1 to 18 is included.

20. A method for preparing a display substrate, characterized in that, Including: Providing a substrate; Forming an organic isolation structure and multiple light-emitting elements on the substrate; wherein, the organic isolation structure includes: multiple organic isolation columns, and at least one of the multiple organic isolation columns is located in the interval between the light-emitting regions of at least two adjacent light-emitting elements that emit different-color light; the at least one organic isolation column includes: a first isolation layer and a second isolation layer stacked, and the second isolation layer is 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, and the first bottom surface is located on the side of the first top surface close to the substrate; the second isolation layer includes: a second bottom surface and a second top surface, the second bottom surface is located on the 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, characterized in that, Forming the organic isolation structure on the substrate includes one of the following: Forming the organic isolation columns by using a halftone mask plate, and the first isolation layer and the second isolation layer of the organic isolation columns are an integrally connected structure. Forming the first isolation layer of the organic isolation columns by using a first mask plate and forming the second isolation layer of the organic isolation columns by using a second mask plate. Forming the first isolation layer and the second isolation layer of the organic isolation columns sequentially through two patterning processes by using a third mask plate, and the exposure amounts of the two patterning processes are different.

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