Display substrate and display device

Abstract

The utility model provides a display substrate and a display device, the display substrate comprises a substrate, a plurality of sub-pixels and a pixel limiting layer, the sub-pixels and the pixel limiting layer are located on the substrate, each sub-pixel comprises a light-emitting functional layer, a first electrode and a second electrode, the first electrode and the second electrode are located on the two sides of the light-emitting functional layer, and the first electrode is located between the light-emitting functional layer and the substrate; at least part of the pixel limiting layer is located on the side, away from the substrate, of the first electrode, the pixel limiting layer comprises a plurality of pixel openings and a pixel limiting part surrounding the pixel openings, and the pixel openings are configured to define effective light-emitting areas of the sub-pixels; the pixel limiting part comprises a first limiting part and a second limiting part which are stacked in the direction away from the substrate, the first limiting part is closer to the substrate than the second limiting part, the color of the first limiting part is black, and the material of the first limiting part is different from that of the second limiting part; the display substrate has high contrast ratio and good display uniformity.

Description

Technical Field

[0001] This disclosure relates to a display substrate and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are an emerging type of flat panel display device with advantages such as self-illumination, high contrast, wide color gamut, and wide operating temperature range, thus having broad application prospects. Utility Model Content

[0003] At least one embodiment of this disclosure provides a display substrate, including a substrate, a plurality of sub-pixels located on the substrate, and a pixel defining layer. Each sub-pixel includes a light-emitting functional layer and a first electrode and a second electrode located on both sides of the light-emitting functional layer in a direction perpendicular to the substrate. The first electrode is located between the light-emitting functional layer and the substrate. At least a portion of the pixel defining layer is located on the side of the first electrode away from the substrate. The pixel defining layer includes a plurality of pixel openings and a pixel defining portion surrounding the plurality of pixel openings. The plurality of pixel openings are configured to define an effective light-emitting area of ​​the plurality of sub-pixels. The pixel defining portion includes a first defining portion and a second defining portion stacked in a direction away from the substrate. The first defining portion is closer to the substrate than the second defining portion. The first defining portion is black in color, and the material of the first defining portion is different from the material of the second defining portion.

[0004] For example, according to at least one embodiment of the present disclosure, the pixel defining portion further includes an isolation structure, the isolation structure, the first defining portion and the second defining portion are stacked in a direction away from the substrate, at least a portion of the first defining portion is located between the isolation structure and the second defining portion, the isolation structure includes an edge portion located on the first electrode, and the thickness of the light-emitting functional layer at the edge portion is less than the thickness of the portion of the light-emitting functional layer located in the pixel opening.

[0005] For example, according to at least one embodiment of the present disclosure, the display substrate includes a first isolation portion, a second isolation portion, and a third isolation portion stacked sequentially, wherein the second isolation portion is located between the first isolation portion and the third isolation portion, and the third isolation portion is further away from the substrate than the first isolation portion, and the second isolation portion and the third isolation portion are made of different materials; the third isolation portion includes a first protrusion protruding relative to the second isolation portion, and the light-emitting functional layer includes multiple film layers, wherein at least one of the multiple film layers is broken at the edge of the first protrusion.

[0006] For example, according to at least one embodiment of the present disclosure, the pixel defining layer further includes a plurality of first defining openings, and the second defining portion is configured to define the plurality of first defining openings; the isolation structure and the second defining portion are configured to jointly define the plurality of pixel openings, the plurality of first defining openings correspond one-to-one with the plurality of pixel openings, and the orthographic projection of the pixel opening on the substrate falls into the orthographic projection of the first defining opening on the substrate.

[0007] For example, in a display substrate provided according to at least one embodiment of the present disclosure, at least a portion of the isolation structure located on the first electrode includes a second protrusion protruding relative to the edge of the second defining portion, and at least one of the light-emitting functional layers is broken at the edge of the second protrusion; the minimum distance between the second protrusion and the edge of the orthogonal projection of the second defining portion on the first electrode of the same sub-pixel is 1 to 2 micrometers.

[0008] For example, according to at least one embodiment of the present disclosure, the pixel defining layer further includes a plurality of second defining openings, and the first defining portion is configured to define the plurality of second defining openings; the orthographic projection of the first defining opening on the substrate falls into the orthographic projection of the second defining opening on the substrate.

[0009] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the first protrusion has a dimension of 100 to 110 nanometers in the protrusion direction of the third isolation portion relative to the second isolation portion, and the isolation structure has a dimension of 70 to 80 nanometers in the direction perpendicular to the substrate.

[0010] For example, according to at least one embodiment of the present disclosure, the isolation structure of the first electrode covering the same sub-pixel includes a first sub-isolation structure and a second sub-isolation structure; the portion of the first sub-isolation structure located on the first electrode includes a second protrusion, and the orthographic projection of the second sub-isolation structure on the substrate falls into the orthographic projection of the second limiting portion on the substrate.

[0011] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the first electrode of the sub-pixel includes a main body portion and a connecting portion connected to each other, at least a portion of the main body portion is exposed by the pixel opening, the sub-pixel further includes a pixel driving circuit electrically connected to the connecting portion and configured to provide a driving signal, the orthographic projection of the main body portion on the substrate is polygonal, and at least one side of the polygon falls into the orthographic projection of the first sub-isolation structure on the substrate.

[0012] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the orthographic projection of the edge of the first electrode of each sub-pixel on the substrate is located within the range of the orthographic projection of the isolation structure on the substrate.

[0013] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the connection portion of the first electrode of the sub-pixel is covered by the isolation structure.

[0014] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the plurality of sub-pixels include a first sub-pixel and a second sub-pixel that are adjacent to each other. The connection portion of the first electrode in the first sub-pixel and the connection portion of the first electrode in the second sub-pixel are both located between the light-emitting area of ​​the first sub-pixel and the light-emitting area of ​​the second sub-pixel. An isolation structure covering the connection portion of the first electrode in the first sub-pixel and an isolation structure covering the connection portion of the first electrode in the second sub-pixel are continuously disposed.

[0015] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the distance between the surface of the second defining portion away from the substrate and the substrate is non-uniform in a direction perpendicular to the substrate.

[0016] For example, in a display substrate provided according to at least one embodiment of the present disclosure, at least a portion of the surface of the second defining portion away from the substrate protrudes in a direction perpendicular to the substrate.

[0017] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the second defining portion includes at least one first recess, the first recess includes a first opening on one side, the light-emitting functional layer includes a first portion located in the first recess and a second portion located on the second defining portion and outside the first recess, the first portion and the second portion are continuously disposed, and the thickness of the first portion is less than the thickness of the second portion.

[0018] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the minimum distance between the first recess and the first defining portion is greater than zero.

[0019] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the first defining portion includes at least one second recess, the second recess includes a second opening, and the orthographic projection of the first recess on the substrate and the orthographic projection of the second recess on the substrate at least partially overlap.

[0020] For example, in a display substrate provided according to at least one embodiment of the present disclosure, at least a portion of the first recess is located in the second recess.

[0021] For example, according to at least one embodiment of the present disclosure, the display substrate further includes a planarization layer located between the first electrode of the sub-pixel and the substrate, at least a portion of the first defining portion is located on the planarization layer, the planarization layer includes at least one third recess, the third recess includes a third opening, and the orthographic projection of the second recess on the substrate and the orthographic projection of the third recess on the substrate at least partially overlap.

[0022] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the orthographic projection of the first recess on the substrate at least partially overlaps with the orthographic projection of the third recess on the substrate.

[0023] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the cross-section of any one of the first recess, the second recess, and the third recess, when cut by a plane, is trapezoidal, rectangular, semi-circular, or polygonal, the plane being parallel to the arrangement direction of two adjacent sub-pixels and perpendicular to the substrate.

[0024] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the portion of the first part covering the surface of the first recess has a first thickness, the second part has a second thickness, and the first thickness is at least 50% of the second thickness.

[0025] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the maximum dimension of either the second recess or the third recess in a direction perpendicular to the substrate is 30% to 50% of the thickness of the portion of the planarization layer excluding the third recess, and the dimension of the third recess in the arrangement direction of adjacent sub-pixels on both sides thereon is 50% to 90% of the thickness of the portion of the planarization layer excluding the third recess.

[0026] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the minimum angle between at least a portion of the side surface of the first recess and a plane parallel to the substrate is a first slope angle; the minimum angle between the tangent of the second recess located at the edge of the second opening and the surface of the first defining portion away from the substrate is a second slope angle; and the minimum angle between the tangent of the third recess located at the edge of the third opening and a plane parallel to the substrate is a third slope angle, wherein any one of the first slope angle, the second slope angle, and the third slope angle is in the range of 0 to 90°.

[0027] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the maximum thickness of the second defining portion is greater than the thickness of the edge portion of the second defining portion that contacts the isolation structure.

[0028] For example, according to at least one embodiment of the present disclosure, the display substrate of the at least one first recess includes at least one sub-recess, the orthographic projection of the sub-recess on the substrate is located between the orthographic projections of the first electrodes of two adjacent sub-pixels of different colors on the substrate, and at least two spaced sub-recesses are provided on the circumferential direction of the first electrode of at least one sub-pixel.

[0029] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the plurality of sub-pixels includes a plurality of first sub-pixels, a plurality of second sub-pixels, and a plurality of third sub-pixels. The turn-on voltages of the first sub-pixels and the second sub-pixels are both less than the turn-on voltage of the third sub-pixels. The sub-recessed portion is provided on at least one side of the first electrode of at least one of the first sub-pixels and the second sub-pixels. The sub-recessed portion is provided on at least two opposite sides of the first electrode of the third sub-pixels.

[0030] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the plurality of third sub-pixels include at least two adjacent third sub-pixels located in the same column, and sub-recesses are continuously disposed on the same side of the two adjacent third sub-pixels located in the same column.

[0031] For example, according to at least one embodiment of the present disclosure, the display substrate further includes: an auxiliary electrode, the auxiliary electrode being located on the same layer as the first electrode of the sub-pixel and spaced apart, the second electrodes of the plurality of sub-pixels being continuously arranged, and the second electrodes of the sub-pixels being electrically connected to the auxiliary electrode.

[0032] For example, according to at least one embodiment of the present disclosure, the display substrate further includes a conductive pattern layer, wherein the conductive pattern layer is located between the auxiliary electrode and the substrate, and the auxiliary electrode is electrically connected to the conductive pattern layer.

[0033] For example, according to at least one embodiment of the present disclosure, the auxiliary electrode includes a main structure, a first auxiliary electrode portion, and a second auxiliary electrode portion, the first auxiliary electrode portion and the second auxiliary electrode portion being spaced apart, the main structure including a plurality of sub-main portions, the first auxiliary electrode portion being connected to an adjacent second auxiliary electrode portion through the sub-main portions, the second electrode of the sub-pixel being electrically connected to the first auxiliary electrode portion through a first via, the main structure being electrically connected to the conductive pattern layer through a second via, and the display substrate further including a support structure located on the side of the second auxiliary electrode portion away from the substrate and in contact with the second auxiliary electrode portion.

[0034] For example, according to at least one embodiment of the display substrate provided in this disclosure, the plurality of sub-pixels includes a plurality of first sub-pixels, a plurality of second sub-pixels, and a plurality of third sub-pixels. The first sub-pixels, the second sub-pixels, and the third sub-pixels constitute a repeating unit. The first sub-pixels and the second sub-pixels in the repeating unit are arranged sequentially in a first arrangement direction. The first sub-pixels and the second sub-pixels are located on one side of the third sub-pixels in a second arrangement direction. The first arrangement direction intersects with the second arrangement direction. At least one auxiliary electrode is located between two adjacent rows of repeating units in the first arrangement direction, and at least a portion of either the first auxiliary electrode portion or the second auxiliary electrode portion is located between adjacent third sub-pixels in the first arrangement direction.

[0035] At least one embodiment of this disclosure also provides another display substrate, comprising: a substrate, a plurality of sub-pixels, and a pixel defining layer. The plurality of sub-pixels are located on the substrate, each sub-pixel including a light-emitting functional layer and a first electrode and a second electrode located on both sides of the light-emitting functional layer in a direction perpendicular to the substrate, the first electrode being located between the light-emitting functional layer and the substrate; at least a portion of the pixel defining layer is located on the side of the first electrode away from the substrate, the pixel defining layer including a plurality of pixel openings and a pixel defining portion surrounding the plurality of pixel openings, the plurality of pixel openings being configured to define an effective light-emitting area of ​​the plurality of sub-pixels; wherein the pixel defining portion includes a first defining portion and a second defining portion stacked in a direction away from the substrate, the first defining portion being closer to the substrate than the second defining portion. The substrate has a first limiting portion and a second limiting portion with different transmittances. The pixel limiting portion further includes an isolation structure. The isolation structure, the first limiting portion, and the second limiting portion are stacked in a direction away from the substrate. At least a portion of the first limiting portion is located between the isolation structure and the second limiting portion. The isolation structure covering the first electrode of the same sub-pixel includes a first sub-isolation structure and a second sub-isolation structure. The portion of the first sub-isolation structure located on the first electrode includes a protrusion that protrudes relative to the edge of the second limiting portion. The thickness of at least one of the light-emitting functional layers at the edge of the protrusion is less than the thickness of the portion of the light-emitting functional layer located in the pixel opening. The orthographic projection of the second sub-isolation structure on the substrate falls into the orthographic projection of the second limiting portion on the substrate.

[0036] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the first defining portion is black.

[0037] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the second defining portion includes at least one first recess, the first recess includes a first opening, the light-emitting functional layer includes a first portion located in the first recess and a second portion located on the second defining portion and outside the first recess, the first portion and the second portion are continuously disposed, and the thickness of the first portion is less than the thickness of the second portion.

[0038] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the first defining portion includes at least one second recess, the second recess includes a second opening, and the orthographic projection of the first recess on the substrate and the orthographic projection of the second recess on the substrate at least partially overlap.

[0039] At least one embodiment of this disclosure also provides a display device, including the display substrate provided in any of the above embodiments.

[0040] At least one embodiment of this disclosure also provides a method for manufacturing a display substrate, comprising: forming a first electrode of a sub-pixel on a substrate; forming a first defining portion on a side of the first electrode away from the substrate; forming a second defining portion on a side of the first defining portion away from the substrate, wherein the first defining portion is black in color, the material of the first defining portion is different from the material of the second defining portion, the first defining portion and the second defining portion constitute a pixel defining portion of a pixel defining layer, the pixel defining layer includes a plurality of pixel openings, the pixel defining portion surrounds the plurality of pixel openings, and the plurality of pixel openings are configured to define an effective light-emitting area of ​​the sub-pixel.

[0041] For example, according to at least one embodiment of the present disclosure, the method for manufacturing a display substrate, before forming the first defining portion on the side of the first electrode away from the substrate, further includes: forming an isolation structure on the side of the first electrode away from the substrate, wherein the isolation structure covers the edge of the first electrode, and the isolation structure, the first defining portion, and the second defining portion constitute the pixel defining portion of the pixel defining layer; forming a protective structure on the side of the isolation structure away from the substrate, wherein the isolation structure includes an edge portion located on the first electrode, and the protective structure covers at least a portion of the edge portion; after forming the second defining portion, the method further includes: removing the protective structure; and forming a light-emitting functional layer of the sub-pixel on the side of the second defining portion away from the substrate and within the pixel opening, wherein the thickness of the light-emitting functional layer at the edge portion of the isolation structure is less than the thickness of the portion of the light-emitting functional layer located in the pixel opening. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0043] Figure 1 A partial planar schematic diagram of a display substrate provided for at least one embodiment of the present disclosure.

[0044] Figure 2 For along Figure 1 The diagram shows the cross-sectional structure cut by line AA'.

[0045] Figure 3 for Figure 1 A partially enlarged schematic diagram of the display substrate.

[0046] Figure 4 For corresponding Figure 3 A cross-sectional schematic diagram of the display substrate.

[0047] Figure 5A A partial planar schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0048] Figure 5B for Figure 5A A magnified view of the area enclosed by the dashed line.

[0049] Figure 6 This is a partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0050] Figure 7 This is a partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0051] Figure 8 This is a partial planar schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0052] Figure 9 This is a partial planar schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0053] Figure 10 For along Figure 8 The diagram shows the cross-sectional structure cut by line BB'.

[0054] Figure 11 This is a partial planar schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0055] Figure 12 for Figure 11 A partially enlarged schematic diagram of the display substrate.

[0056] Figure 13 For along Figure 12 The diagram shows the cross-sectional structure cut by line CC'.

[0057] Figure 14 This is a schematic diagram of the stacking of a conductive pattern layer and a first electrode in a display substrate provided for at least one embodiment of the present disclosure.

[0058] Figure 15 This is a schematic diagram of a first electrode in a display substrate provided for at least one embodiment of the present disclosure.

[0059] Figure 16 This is a schematic diagram of the stacking of a first electrode and an isolation structure in a display substrate provided for at least one embodiment of the present disclosure.

[0060] Figure 17 This is a schematic diagram of the stacked first electrode, isolation structure, and first defining layer in a display substrate provided for at least one embodiment of the present disclosure.

[0061] Figure 18 For along Figure 16 The diagram shows the cross-sectional structure cut by line DD'.

[0062] Figure 19 This is a schematic block diagram of a display device provided according to another embodiment of the present disclosure.

[0063] Figures 20-30 A flowchart illustrating a method for manufacturing a display substrate according to an embodiment of this disclosure. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the described embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0065] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0066] The features such as "parallel," "perpendicular," and "identical" used in the embodiments of this disclosure include features in the strict sense of "parallel," "perpendicular," and "identical," as well as cases where "approximately parallel," "approximately perpendicular," and "approximately identical" include certain errors, taking into account measurement and errors associated with the measurement of a specific quantity (e.g., limitations of the measurement system), and represent the acceptable deviation range for a specific value as determined by a person skilled in the art. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of said value. Unless otherwise specified in the following embodiments of this disclosure, the quantity of a component is implied to mean that the component may be one or more, or can be understood as at least one. "At least one" means one or more, and "more" means at least two. The term "integrated structure" used in the embodiments of this disclosure refers to two or more components formed using the same material in the same patterning process.

[0067] Single-layer organic light-emitting diode (OLED) displays, also known as single devices, are organic light-emitting display devices consisting of a single light-emitting layer. As users' requirements for the display lifespan of single devices have gradually increased, tandem technology has emerged. The tandem structure used in OLED displays improves the lifespan and brightness of the light-emitting device by adding at least one light-emitting layer and a charge-generating layer, thereby improving the standby time and lifespan of the display device.

[0068] Tandem technology involves stacking and connecting two light-emitting layers in series within a sub-pixel, with a charge-generating layer, such as a P-type doped charge-generating layer P-CGL and an N-type doped charge-generating layer N-CGL, between the stacked light-emitting layers. Compared to display substrates without tandem devices, tandem devices use N / P-CGL as a heterojunction to connect the two light-emitting layers in series. This technology achieves dual light-emitting devices in series, significantly reducing the luminous current of the light-emitting devices at the same luminous intensity, thus improving the lifespan of organic light-emitting elements and reducing power consumption.

[0069] In response to customer demands for a fully black finish in display products, such as Organic Light-Emitting Diode (OLED) products, the use of a black Pixel Define Layer (PDL) enables a completely black visual effect for the display, giving the entire product (such as a display screen or photovoltaic module) a uniform black appearance. Simultaneously, this fully black design enhances the immersion and contrast of the displayed image, resulting in a superior viewing experience and improved aesthetics.

[0070] In their research, the inventors of this application discovered that the black pixel definition film used in some display products poses several risks. For example, during multiple development processes, surface roughness can easily increase, leading to uneven optical density (OD). Furthermore, directly patterning the black pixel definition film can generate burrs on the surface of the formed pattern, which may pierce or interrupt other layers (such as the cathode) on the black pixel definition film, thus affecting display uniformity. Additionally, the black pixel definition film exhibits significant outgassing, potentially generating large amounts of gases (such as water vapor and oxygen), which may degrade materials in the light-emitting functional layer, resulting in black spots or dark areas.

[0071] At least one embodiment of this disclosure provides a display substrate, including a substrate, a plurality of sub-pixels, and a pixel defining layer. The plurality of sub-pixels are located on the substrate, and each sub-pixel includes a light-emitting functional layer and a first electrode and a second electrode located on both sides of the light-emitting functional layer in a direction perpendicular to the substrate. The first electrode is located between the light-emitting functional layer and the substrate. At least a portion of the pixel defining layer is located on the side of the first electrode away from the substrate. The pixel defining layer includes a plurality of pixel openings and a pixel defining portion surrounding the plurality of pixel openings. The plurality of pixel openings are configured to define an effective light-emitting area of ​​the plurality of sub-pixels. The pixel defining portion includes a first defining portion and a second defining portion stacked in a direction away from the substrate. The first defining portion is closer to the substrate than the second defining portion. The first defining portion is black in color, and the material of the first defining portion is different from the material of the second defining portion.

[0072] At least one embodiment of this disclosure also provides a display device, including a display substrate provided in any embodiment of this disclosure.

[0073] At least one embodiment of this disclosure also provides a method for manufacturing a display substrate, comprising: forming a first electrode of a sub-pixel on a substrate; forming a first defining portion on a side of the first electrode away from the substrate; forming a second defining portion on a side of the first defining portion away from the substrate, wherein the first defining portion is black in color, the material of the first defining portion is different from the material of the second defining portion, the first defining portion and the second defining portion constitute a pixel defining portion of a pixel defining layer, the pixel defining layer includes a plurality of pixel openings, the pixel defining portion surrounds the plurality of pixel openings, and the plurality of pixel openings are configured to define an effective light-emitting area of ​​the sub-pixel.

[0074] The display substrate and its manufacturing method, as well as the display device, provided in at least one embodiment of this disclosure, enhance the immersion and contrast of the displayed image by including a first limiting portion and a second limiting portion stacked together in the pixel defining layer, and by having the first limiting portion be black, thus providing a superior viewing experience for the user. Furthermore, the second limiting portion is provided on the side of the first limiting portion away from the substrate, which mitigates the impact of the large surface roughness of the first limiting portion. This reduces the risk of burrs being generated during direct patterning of the first limiting portion, potentially piercing or blocking other film layers (such as the cathode). It also weakens the outgassing phenomenon of the first limiting portion, reducing the amount of released gas and thus lowering the risk of black spots or dark areas, thereby improving display uniformity.

[0075] The display substrate, its manufacturing method, and display device provided in the embodiments of this disclosure are described below with reference to the accompanying drawings.

[0076] Figure 1 A partial planar schematic diagram of a display substrate provided for at least one embodiment of the present disclosure; Figure 2 For along Figure 1 The diagram shows the cross-sectional structure cut by line AA'.

[0077] like Figure 1 and Figure 2 As shown, the display substrate includes a substrate 01, a plurality of sub-pixels 10 located on the substrate 01, and a pixel defining layer 20. Each sub-pixel 100 includes a light-emitting functional layer 130 and a first electrode 110 and a second electrode 120 located on both sides of the light-emitting functional layer 130 along a direction perpendicular to the substrate 01. The first electrode 110 is located between the light-emitting functional layer 130 and the substrate 01. For example, the display substrate includes a display area and a peripheral area surrounding the display area. The plurality of sub-pixels 100 are located in the display area of ​​the display substrate, and the pixel defining layer 20 may include a portion located in the display area and a portion located in the peripheral area.

[0078] For example, such as Figure 2 As shown, the first electrode 110 can be the anode, and the second electrode 120 can be the cathode.

[0079] like Figure 1 and Figure 2As shown, at least a portion of the pixel defining layer 20 is located between the light-emitting functional layer 130 and the first electrode 110. The pixel defining layer 20 includes a plurality of pixel openings 201 and a pixel defining portion 200 surrounding the plurality of pixel openings 201. The pixel openings 201 expose at least a portion of the first electrode 110 and are configured to define an effective light-emitting area of ​​the sub-pixel 10. The light-emitting functional layer 130 is disposed in contact with the first electrode 110 through the pixel openings 201. For example, the first electrode 110 and the second electrode 120 located on both sides of the light-emitting functional layer 130 can drive the light-emitting functional layer 130 located between them to emit light. For example, the shape of the effective light-emitting area of ​​the sub-pixel 10 refers to a two-dimensional shape. For example, the shape of the effective light-emitting area may be the same as the shape of the orthographic projection of the portion of the first electrode 110 exposed by the pixel openings 201 onto the substrate 01.

[0080] like Figure 1 and Figure 2 As shown, the pixel defining portion 200 includes a first defining portion 210 and a second defining portion 220 stacked in a direction away from the substrate 01, wherein the first defining portion 210 is closer to the substrate 01 than the second defining portion 220. For example, the first defining portion 210 and the second defining portion 220 are part of the pixel defining portion 200, that is, the pixel defining portion 200 may also include other structures besides the first defining portion 210 and the second defining portion 220 (e.g., the isolation structure 230 described later).

[0081] like Figure 1 and Figure 2 As shown, the first defining portion 210 is black, and the material of the first defining portion 210 is different from that of the second defining portion 220. For example, the first defining portion 210 may include a negative photoresist containing black pigment (such as carbon black, titanium black, etc.), and its components may include a resin containing double bonds, an initiator, and a crosslinking agent. For example, the second defining portion 210 may be made of a transparent material. For example, the second defining portion 210 may be made of photosensitive polyimide, but the embodiments of this disclosure are not limited thereto.

[0082] In at least one embodiment of the display substrate provided in this disclosure, since the pixel defining layer includes a first defining portion and a second defining portion stacked together, and the first defining portion is black, the immersiveness and contrast of the displayed image can be improved, resulting in a better viewing experience for the user. Furthermore, the second defining portion is provided on the side of the first defining portion away from the substrate, which can mitigate the impact of the large surface roughness of the first defining portion. This reduces the risk of burrs being generated during direct patterning of the first defining portion, potentially piercing or blocking other film layers (such as the second electrode), and weakens the outgassing phenomenon of the first defining portion, reducing the amount of released gas and thus lowering the risk of black spots or dark areas, thereby improving display uniformity.

[0083] Because Tandem devices have two stacked light-emitting units, these two light-emitting units need to be connected by a charge generation layer. Since the charge generation layer has strong conductivity, the crosstalk problem of Tandem devices is particularly severe.

[0084] In some embodiments, such as Figure 2 As shown, the pixel defining portion 200 also includes an isolation structure 230. The isolation structure 230, the first defining portion 210, and the second defining portion 220 are stacked in a direction away from the substrate 01, and at least a portion of the first defining portion 210 is located between the isolation structure 230 and the second defining portion 220. For example, the isolation structure 230 includes an edge portion E located on the first electrode 110, and the thickness of the light-emitting functional layer 130 at the edge portion E is less than the thickness of the portion of the light-emitting functional layer 130 located in the pixel opening 201. For example, part or all of the film layer of the light-emitting functional layer 130 may be thinned or separated at the edge portion E. For example, the edge portion E of the isolation structure 230 may have different protrusion shapes. Figure 2 The edge portion E shown is merely an example, and the embodiments disclosed herein are not intended to limit the scope of the invention.

[0085] In some embodiments, such as Figure 2 As shown, the light-emitting functional layer 130 may include a light-emitting layer for emitting light and a charge-generating layer 133. For example, the light-emitting functional layer 130 may be a film layer in an organic light-emitting element. For example, the light-emitting functional layer 130 may include a first light-emitting layer, a charge-generating layer (CGL) 133, and a second light-emitting layer stacked together, with the charge-generating layer 133 located between the first light-emitting layer and the second light-emitting layer. Figure 2 As shown, the thicknesses of the multiple film layers included in the light-emitting functional layer 130 are only for clear illustration of each film layer and do not represent actual dimensions. For example, in the same sub-pixel 10, the first light-emitting layer and the second light-emitting layer can be light-emitting layers that emit the same color of light. For example, the first light-emitting layer in a sub-pixel 10 that emits different colors of light emits different colors of light. For example, the second light-emitting layer in a sub-pixel 10 that emits different colors of light emits different colors of light.

[0086] In some embodiments, such as Figure 2As shown, the film layer 131 between the charge generation layer 133 and the substrate 01 may include a first light-emitting layer and other functional layers, such as a hole injection layer between the first electrode 110 and the first light-emitting layer; or an electron transport layer between the charge generation layer 133 and the first light-emitting layer. For example, the film layer 132 between the charge generation layer 133 and the second electrode 120 may include a second light-emitting layer and other functional layers, such as a hole transport layer between the second light-emitting layer and the charge generation layer 133. For example, an electron transport layer and an electron injection layer may be provided between the second light-emitting layer and the second electrode 120.

[0087] In some embodiments, the hole injection layer, hole transport layer, electron transport layer, electron injection layer, charge generation layer, and second electrode are all shared film layers of multiple sub-pixels, and can be referred to as common layers. For example, the common layer and the second electrode can be film layers formed using an open mask. For example, the first light-emitting layer and the second light-emitting layer can be film layers formed using a fine metal mask (FMM), and a gap can be set between the light-emitting layers of different sub-pixels.

[0088] In some embodiments, such as Figure 2 As shown, the charge generation layer 133 has strong conductivity, which enables the light-emitting functional layer 130 to have advantages such as long lifetime, low power consumption, and high brightness. For example, the charge generation layer 133 may include an N-type charge generation layer and a P-type charge generation layer. For example, the material of the charge generation layer 133 may be a material containing phosphorothoxy groups or a material containing triazine. For example, the ratio of the electron mobility of the material in the charge generation layer 133 to the electron mobility of the material in the electron transport layer is 10. -2 ~10 2 .

[0089] By reducing the thickness of the light-emitting functional layer at the edge of the isolation structure, the risk of crosstalk between adjacent sub-pixels can be reduced, which helps to improve the risk of lateral leakage in display products.

[0090] In some embodiments, such as Figure 2As shown, the isolation structure 230 may include multiple layers, such as two or three layers, and the embodiments disclosed herein are not limited thereto. For example, the isolation structure 230 may include a first isolation portion 2310, a second isolation portion 2320, and a third isolation portion 2330 stacked sequentially, with the second isolation portion 2320 located between the first isolation portion 2310 and the third isolation portion 2330, and the third isolation portion 2330 being further away from the substrate 01 than the first isolation portion 2310. For example, the second isolation portion 2320 and the third isolation portion 2330 may be made of different materials. For example, the first isolation portion 2310 and the third isolation portion 2330 may be made of the same material, such as silicon oxide (SiOx) or silicon dioxide (SiO2), while the second isolation portion 2320 may include silicon nitride (SiNx).

[0091] In some embodiments, such as Figure 2 As shown, in the direction perpendicular to the substrate 01, the dimensions of the first isolation portion 2310 and the third isolation portion 2330 can be smaller than the dimension of the second isolation portion 2320. For example, in the direction perpendicular to the substrate 01, the dimensions of the first isolation portion 2310 and the third isolation portion 2330 can be the same or substantially the same, such as 19 to 23 nanometers, e.g., 19 nanometers, 20 nanometers, 21 nanometers, 22 nanometers, or 23 nanometers. For example, in the direction perpendicular to the substrate 01, the dimension of the third isolation portion 2320 can be 73 to 75 nanometers, e.g., 73 nanometers, 74 nanometers, or 75 nanometers; the embodiments of this disclosure do not limit this.

[0092] In some embodiments, such as Figure 2 As shown, the third isolation portion 2330 includes a first protrusion 2331 that protrudes relative to the second isolation portion 2320, and the light-emitting functional layer 130 includes multiple film layers, with at least one of the multiple film layers being broken at the edge of the first protrusion 2331. For example, the third isolation portion 2330 is located in... Figure 2 The first protrusion 2331 protrudes in the direction X relative to the second isolation portion 2320. For example, the aforementioned edge of the first protrusion 2331 can serve as the edge portion E of the isolation structure 230. For example, the second isolation portion 2320 is recessed relative to the first isolation portion 2310 and the third isolation portion 2330. For example, the edge of the sidewall of the portion of the third isolation portion 2330 that protrudes from the second isolation portion 2320 can serve as the aforementioned edge portion E.

[0093] In some embodiments, such as Figure 2As shown, the edge E of the isolation structure 230 is located on the side of the first electrode 110 of the sub-pixel 10 away from the substrate 01. Part or all of the light-emitting functional layer 130 is separated at the edge E. Each separated layer includes a portion located on the first electrode 110 and a portion spaced apart from this portion and located on the isolation structure 230. By separating at least one layer of the light-emitting functional layer, the uneven low-grayscale brightness of the sub-pixel can be effectively improved.

[0094] In some embodiments, reference Figure 2 At least one layer of the light-emitting functional layer 130 can be thinned at the edge portion E of the isolation structure 230. For example, the shape, slope angle, size, etc. of the edge portion E of the isolation structure 230 can be flexibly designed according to design requirements, and the embodiments of this disclosure do not limit this.

[0095] In some embodiments, such as Figure 2 As shown, at least a portion of the isolation structure 230 located on the first electrode 110 includes a second protrusion 2332 that protrudes relative to the edge of the second defining portion 220, and at least one layer of the light-emitting functional layer 130 is interrupted at the edge of the second protrusion 2332. For example, the first protrusion 2331 is a part of the second protrusion 2332, and the edge of the first protrusion 2331 serves as the edge of the second protrusion 2332, so as to isolate part or all of the film layers in the light-emitting functional layer 130.

[0096] In some embodiments, such as Figure 2 As shown, the minimum distance L1 between the edges of the second protrusion 2332 and the second limiting portion 220 projected onto the first electrode 110 of the same sub-pixel 10 is 1 to 2 micrometers, for example, it can be 1.2 to 1.5 micrometers, 1.3 to 1.6 micrometers, 1.4 to 1.7 micrometers, 1.5 to 1.8 micrometers or 1.6 to 1.9 micrometers. The embodiments of this disclosure do not limit this.

[0097] By making the distance L1 1 to 2 micrometers, it is possible to better ensure that the partition structure has a sufficient portion exposed by the second limiting part, so that the second protrusion has a good ability to block or thin the light-emitting functional layer.

[0098] In some embodiments, such as Figure 2 As shown, the first protrusion 2331 is in the protrusion direction of the third isolation portion 2330 relative to the second isolation portion 2320 (e.g. Figure 2 The dimension L2 (in the direction X shown) is 100–110 nanometers, such as 101–103 nanometers, 102–104 nanometers, 103–105 nanometers, 104–106 nanometers, 105–108 nanometers or 106–109 nanometers.

[0099] In some embodiments, such as Figure 2 As shown, the dimension L3 of the isolation structure 230 in the direction perpendicular to the substrate 01 is 70-80 nanometers, such as 71-73 nanometers, 72-74 nanometers, 73-75 nanometers, 74-76 nanometers, 75-78 nanometers, or 76-79 nanometers. For example, the aforementioned dimension L3 can be the sum of the dimensions of the first isolation portion 2310, the second isolation portion 2320, and the third isolation portion 2330 in the Z direction.

[0100] This configuration, by ensuring that dimensions L2 and L3 fall within the aforementioned range, helps to prevent the first isolation portion of the isolation structure from collapsing and causing the isolation structure to fail. This, in turn, better ensures that the partition structure has good isolation or thinning capabilities for the light-emitting functional layer.

[0101] In some embodiments, such as Figure 1 and Figure 2 As shown, the pixel defining layer 20 also includes a plurality of first defining openings 202, and the second defining portion 220 is configured to define the plurality of first defining openings 202. The isolation structure 230 and the second defining portion 220 are configured to jointly define the plurality of pixel openings 201, and the plurality of first defining openings 202 correspond one-to-one with the plurality of pixel openings 201, and the orthographic projection of the pixel opening 201 on the substrate 01 falls into the orthographic projection of the first defining opening 202 on the substrate 01.

[0102] In some embodiments, such as Figure 1 and Figure 2 As shown, the portion of the isolation structure 230 not covered by the second limiting portion 220, together with the second limiting portion 220, defines the pixel opening 201. As an example, Figure 1 The shaded area shows the effective light-emitting area of ​​a sub-pixel 10 defined by a pixel opening. For example, the orthographic projection area of ​​the pixel opening 201 on the substrate 01 is smaller than the orthographic projection area of ​​the first defining opening 202 on the substrate 01. For example, the centers of the pixel opening 201 and the first defining opening 202 exposing the first electrode of the same sub-pixel 10 do not coincide; for example, the center can be the center of symmetry or centroid of the orthographic projection of each opening on the substrate 01.

[0103] In some embodiments, such as Figure 1 and Figure 2As shown, the pixel defining layer 20 also includes a plurality of second defining openings 203, and the first defining portion 210 is configured to define the plurality of second defining openings 203. For example, the orthographic projection of the first defining opening 202 on the substrate 01 falls within the orthographic projection of the second defining opening 203 on the substrate 01. For example, the orthographic projection area of ​​the second defining opening 203 on the substrate 01 is larger than the orthographic projection area of ​​the first defining opening 202 on the substrate 01, and the orthographic projection area of ​​the first defining opening 202 on the substrate 01 is larger than the orthographic projection area of ​​the pixel opening 201 on the substrate 01. For example, the first defining portion 210 is located between the isolation structure 230 and the second defining portion 220, and the first defining portion 210 is completely covered by the second defining portion 220.

[0104] Therefore, the impact of the large surface roughness of the first limiting part can be reduced, and the outgas phenomenon of the first limiting part can be better weakened, thereby reducing the risk of black spots or dark areas and improving display uniformity.

[0105] In some embodiments, such as Figure 1 and Figure 2 As shown, the orthographic projection of the edge of the first electrode 110 of each sub-pixel 10 onto the substrate 01 lies within the range of the orthographic projection of the isolation structure 230 onto the substrate 01. For example, the edge of the first electrode 110 of the sub-pixel 10 is covered by the isolation structure 230.

[0106] This allows the isolation structure to better protect the edge of the first electrode of the sub-pixel, preventing the dry etching gas from etching or corroding the first electrode of the sub-pixel during the formation of the isolation structure, such as when using a dry etching process.

[0107] In some embodiments, such as Figure 1 and Figure 2As shown, the first electrode 110 of sub-pixel 10 includes a main body portion 1110 and a connecting portion 1120 connected to each other, with at least a portion of the main body portion 1110 exposed by a pixel opening 201. Sub-pixel 10 includes a pixel driving circuit (not shown), which is electrically connected to the connecting portion 1120 and configured to provide a driving signal. For example, the display substrate further includes a film layer 02 and a planarization layer 03, the planarization layer 03 being located between the first electrode 110 of sub-pixel 10 and the substrate 01, and at least a portion of the first defining portion 210 (e.g., a portion of the first defining portion 210 located between adjacent sub-pixels) being located on the planarization layer 03. For example, the pixel driving circuit may be located in the film layer 02, and the first electrode 110 of sub-pixel 10 may be electrically connected to the pixel driving circuit through a via penetrating the planarization layer 03. For example, the film layer 02 may also include other structures, such as a passivation layer, a buffer layer, a gate insulating layer, an interlayer insulating layer, etc., which are not limited in the embodiments of this disclosure.

[0108] In some embodiments, such as Figure 1 As shown, the connection portion 1120 of the first electrode 110 of the sub-pixel 10 is covered by the isolation structure 230. The orthographic projection of the connection portion 1120 of the first electrode 110 on the substrate 01 falls completely into the orthographic projection of the isolation structure 230 on the substrate 01.

[0109] This design allows the isolation structure to better protect the connection portion of the first electrode of the sub-pixel, thus preventing the dry etching gas from etching or corroding the connection portion of the first electrode during the formation of the isolation structure, such as when using a dry etching process. Furthermore, it allows for a flatter film layer at the location of the connection portion of the first electrode (corresponding to the via electrically connected to the pixel driving circuit).

[0110] In some embodiments, such as Figure 1 As shown, the plurality of sub-pixels 10 includes a first sub-pixel 11 and a second sub-pixel 12 that are adjacent to each other. The connection portion 1120 of the first electrode 110 in the first sub-pixel 11 and the connection portion 1120 of the first electrode 110 in the second sub-pixel 12 are both located between the light-emitting areas of the first sub-pixel 11 and the light-emitting areas of the second sub-pixel 12. For example, "adjacent sub-pixels" means that no other sub-pixels are set between two sub-pixels. Adjacent sub-pixels can be two sub-pixels of the same color or two sub-pixels of different colors. Figure 1 The diagram schematically shows the arrangement of adjacent first sub-pixels 11 and second sub-pixels 12 in the Y direction.

[0111] In some embodiments, such as Figure 1As shown, the isolation structure 230 covering the connection portion 1120 of the first electrode 110 in the first sub-pixel 11 and the isolation structure 230 covering the connection portion 1120 of the first electrode 110 in the second sub-pixel 12 are continuously disposed. For example, the portion of the isolation structure 230 located between adjacent first sub-pixels 11 and second sub-pixels 12 simultaneously covers the connection portion 1120 of the first electrode 110 in both sub-pixels 10.

[0112] This design allows for the protection of the connection portion of the first electrode of the sub-pixel through the isolation structure, while also simplifying the manufacturing process of the isolation structure.

[0113] In some embodiments, such as Figure 1 and Figure 2 As shown, the isolation structure 230 covering the first electrode 110 of the same sub-pixel 10 includes a first sub-isolation structure 2301 and a second sub-isolation structure 2302. The portion of the first sub-isolation structure 2301 located on the first electrode 110 includes the aforementioned second protrusion 2332. That is, at least a portion of the first sub-isolation structure 2301 is exposed by the first defining opening 202 to have a second protrusion 2332 relative to the second defining portion 220, thereby isolating at least one layer of the light-emitting functional layer 130. For example, the orthographic projection of the second sub-isolation structure 2302 on the substrate 01 falls into the orthographic projection of the second defining portion 2320 on the substrate 01, that is, the second sub-isolation structure 2302 is covered by the second defining portion 2320, thereby allowing the light-emitting functional layer 130 and the second electrode 120 to be continuous at the second sub-isolation structure 2302.

[0114] In some embodiments, reference Figure 1 and Figure 2 The isolation structure 230 covering the first electrode 110 of the same sub-pixel 10 may also include only the first sub-isolation structure 2301 and not the second sub-isolation structure 2302. Thus, while satisfying the requirement of isolating at least one film layer of the light-emitting functional layer 130, the manufacturing process of the isolation structure is simplified. The embodiments of this disclosure do not limit the specific structural form of the isolation structure.

[0115] It should be noted that in the embodiments of this disclosure, the second electrodes of different sub-pixels are continuously arranged, forming a charge transport path to achieve a good and uniform conduction effect. For example, the second electrodes of the sub-pixels are continuously arranged at the second sub-isolation structure. For example, the second electrodes of the sub-pixels can be isolated at the first sub-isolation structure, or they can be continuously arranged, depending on the size and structural form of the first sub-isolation structure. The embodiments of this disclosure do not limit this.

[0116] In some embodiments, such as Figure 1and Figure 2 As shown, the orthographic projection of the main body 1110 of the first electrode 110 of the sub-pixel 10 onto the substrate 01 is polygonal, and at least one side of the polygon falls within the orthographic projection of the first sub-isolation structure 2301 onto the substrate 01. For example, the orthographic projection of the main body 1110 of the first electrode 110 of the sub-pixel 10 onto the substrate 01 is rectangular, and the portion of the first electrode 110 corresponding to two sides of the rectangle is covered by the first sub-isolation structure 2301, thereby isolating at least one layer of the light-emitting functional layer 130. The portion of the first electrode 110 corresponding to the other two sides of the rectangle is covered by the second sub-isolation structure 2302, thereby making at least one layer of the light-emitting functional layer 130 continuous.

[0117] Figure 3 for Figure 1 A partially enlarged schematic diagram of the display substrate; Figure 4 For corresponding Figure 3 A cross-sectional schematic diagram of a display substrate. For example, Figure 3 for Figure 1 A magnified view of the area enclosed by the dashed line. Figure 4 for Figure 2 The schematic diagram shows the display substrate with the light-emitting functional layer 130, the second electrode 120, the film layer 02, and the substrate 01 omitted.

[0118] In some embodiments, such as Figure 3 and Figure 4 As shown, in direction X, the portion of the first sub-isolation structure 2301 extending beyond the first electrode 110 has dimension a; the portion of the first sub-isolation structure 2301 located on the first electrode 110 and covered by the first limiting portion 210 has dimension b; and the portion of the first sub-isolation structure 2301 located on the first electrode 110, covered by the second limiting portion 220, and exposed by the first limiting portion 210 has dimension c. In direction X, the portion of the second sub-isolation structure 2302 extending beyond the first electrode 110 has dimension h; the portion of the second sub-isolation structure 2302 located on the first electrode 110 and covered by the first limiting portion 210 has dimension g; the portion of the first limiting portion 210 located on the first electrode 110 and extending beyond the second sub-isolation structure 2302 has dimension f; and the portion of the second limiting portion 220 extending beyond the first limiting portion 210 that covers the same second sub-isolation structure 2302 has dimension e. For example, the dimensions a, b, c, h, g, f, and e mentioned above are all 0.8 to 1.2 micrometers, such as 0.9 micrometers, 1.0 micrometers, or 1.1 micrometers. The embodiments of this disclosure do not limit this.

[0119] Figure 5A A partial plan view of another display substrate provided for at least one embodiment of this disclosure. Figure 5B for Figure 5A A magnified view of the area enclosed by the dashed line.

[0120] In some embodiments, such as Figure 5A As shown, the orthographic projection of the main body 1110 of the first electrode 110 of the sub-pixel 10 onto the substrate 01 is rectangular, and three sides of this rectangle fall into the first sub-isolation structure 2301 (reference). Figure 2 In the orthographic projection onto the substrate 01, that is, the portion of the first electrode 110 corresponding to three sides of the aforementioned rectangle is covered by the first sub-isolation structure 2301, thereby enhancing the isolation capability of at least one layer of the light-emitting functional layer 130. The portion of the first electrode 110 corresponding to the other side of the aforementioned rectangle is covered by the second sub-isolation structure 2302 (see reference). Figure 2 The light-emitting functional layer 130 is covered, thereby allowing at least one layer of the film layer to be continuous.

[0121] For details regarding the other structures in the display substrate shown in Figure 5 besides the isolation structure, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0122] In some OLED products, lateral leakage may occur when the OLED display substrate is lit (i.e., when some pixel areas in the display substrate are lit, a strong leakage current is easily generated between the lit pixel areas and adjacent pixel areas that should not be lit, causing the non-lit pixel areas to emit a faint light, i.e., sub-pixel stealth lighting), leading to back-side brightness and color difference in sub-pixels, thus reducing the display effect of the display substrate. To alleviate the above problems, embodiments of this disclosure provide an isolation structure to isolate at least one of the light-emitting functional layers. To further enhance the improvement effect on the above-mentioned lateral leakage, at least one embodiment of this disclosure further improves the structure of the second limiting layer, as detailed in the following description of the embodiments.

[0123] Figure 6 This is a partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0124] In some embodiments, such as Figure 6 As shown, in the direction perpendicular to the substrate 01, the distance between the surface S1 of the second defining portion 220 away from the substrate 01 and the substrate 01 is non-uniform. For example, the portion of the second defining portion 220 located between adjacent sub-pixels generally has a shape that protrudes in the direction away from the substrate 01, but is not limited thereto.

[0125] In some embodiments, the surface of the second defining portion away from the substrate may also include a portion parallel to the substrate, which is not limited in the embodiments of this disclosure.

[0126] This configuration extends the transmission path of the light-emitting functional layer, thereby reducing the charge transfer efficiency and lowering the risk of crosstalk between adjacent sub-pixels and lateral leakage.

[0127] In some embodiments, reference Figure 6 In a direction perpendicular to the substrate 01, at least a portion of the surface of the second defining portion 220, away from the substrate 01, protrudes in a direction away from the substrate 01. For example, the second defining portion may include a main defining portion and at least one protruding defining portion (not shown in the figure) connected to each other, each protruding defining portion being located on the side of the main defining portion away from the substrate and protruding relative to the main defining portion. For example, the cross-section of the protruding defining portion cut by a plane parallel to the directions Z and X may be circular, semi-circular, or polygonal, etc., and the embodiments of this disclosure are not limited in this respect.

[0128] With this configuration, the thickness of at least a portion of the light-emitting functional layer at the protruding limiting portion can be reduced, thereby reducing the charge transport efficiency and thus reducing the risk of crosstalk between adjacent sub-pixels and lateral leakage.

[0129] In some embodiments, such as Figure 6 As shown, at least a portion of the surface of the second defining portion 220 away from the substrate 01 is recessed toward the substrate 01. For example, the second defining portion 220 includes at least one first recess 221, and the first recess 221 includes a first opening 2210. For example, the first opening 2210 faces the side of the second defining portion 220 away from the substrate 01. The light-emitting functional layer 130 includes a first portion 1301 located in the first recess 221 and a second portion 1302 located on the second defining portion 220 and outside the first recess 221. The first portion 1301 and the second portion 1302 are continuously disposed, and the thickness of the first portion 1301 is less than the thickness of the second portion 1302. For example, the first recess 221 can be a groove, and the thickness of at least one layer of the light-emitting functional layer 130 can be reduced at the groove opening. By extending the charge transport path and increasing the resistance through the first recess 221, the charge transfer efficiency is reduced, thereby reducing the risk of crosstalk between adjacent sub-pixels and lateral leakage.

[0130] In some embodiments, such as Figure 6As shown, the first recess 221 is cut by a plane, the cross-section of which is trapezoidal or rectangular, for example, the plane being parallel to the plane containing directions X and Z. The portion of the first part 1301 covering the surface of the first recess 221 has a first thickness t1, the second part 1302 has a second thickness t2, and the first thickness t1 is at least 50% of the second thickness t2. For example, the first thickness t1 can be 50%, 60%, 70%, 75%, or 80% of the second thickness t2, but is not limited thereto.

[0131] This allows the thickness of the light-emitting functional layer to be effectively reduced at the first recess, thereby effectively reducing the charge transfer efficiency and the risk of crosstalk and lateral leakage between adjacent sub-pixels.

[0132] In some embodiments, such as Figure 6 As shown, in order to further extend the charge transport path, the second limiting portion 220 may include a plurality of first recesses 221. For example, the dimensions (i.e., depths) of the plurality of first recesses 221 in the thickness direction of the second limiting portion 220 may be different, and the embodiments of this disclosure are not limited in this regard.

[0133] In some embodiments, such as Figure 6 As shown, the minimum distance H between the first recess 221 and the first limiting portion 210 is greater than zero. For example, the bottom surface of the first recess 221 near the substrate is spaced apart from the first limiting portion 210.

[0134] This design prevents the first limiting portion from being exposed by the first recessed portion, thereby preventing the first limiting portion from contacting the light-emitting functional layer. This reduces the impact caused by the large surface roughness of the first limiting portion and lowers the risk of burrs on the surface of the first limiting portion piercing or blocking other film layers (such as the second electrode). It also weakens the outgassing phenomenon of the first limiting portion, thereby reducing the amount of gas released, lowering the risk of black spots or dark areas, and improving display uniformity.

[0135] In some embodiments, such as Figure 6 As shown, the maximum thickness u1 of the second limiting portion 220 is greater than the thickness u2 of the edge portion of the second limiting portion 220 that contacts the isolation structure 230. For example, the portion of the second limiting portion 220 located in an adjacent sub-pixel and not overlapping with the isolation structure 230 in the Z direction has a larger thickness, while the portion overlapping with the isolation structure 230 in the Z direction has a smaller thickness.

[0136] This configuration allows for a larger process margin, reducing the risk of over-etching and facilitating the formation of a first recess in the second limiting portion. This ensures that the first recess has sufficient depth to allow for thinning of the light-emitting functional layer.

[0137] Figure 7 This is a partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0138] In some embodiments, such as Figure 7 As shown, the first defining portion 210 includes at least one second recess 222, and the second recess 222 includes a second opening 2220. The orthographic projection of the first recess 221 on the substrate 01 and the orthographic projection of the second recess 222 on the substrate 01 at least partially overlap. For example, the second opening 2220 faces the side of the first defining portion 210 away from the substrate 01. For example, the orthographic projection of the first recess 221 on the substrate 01 falls within the orthographic projection of the second recess 222 on the substrate 01. For example, the orthographic projection area of ​​the first recess 221 on the substrate 01 is not greater than the orthographic projection area of ​​the second recess 222 on the substrate 01.

[0139] This configuration allows for an increase in the thickness of the portion where the second limiting portion and the second recess overlap (e.g., in the thickness direction of the second limiting portion) before the first recess is formed. This increases the depth of the first recess during its formation, thereby enhancing the thinning capability of the first recess for the light-emitting functional layer.

[0140] In some embodiments, reference Figure 7 At least a portion of the first recess 221 is located within the second recess 222. For example, the bottom surface of the first recess 221 may be located within the second recess 222. For example, the minimum distance between the first recess 221 and the second recess 222 may be less than the minimum thickness of the portion of the second limiting portion 220 located outside the second recess 222.

[0141] This design maximizes the depth of the first recess while minimizing the overall height of the display substrate (e.g., the dimension in the Z direction), thus facilitating a thinner and lighter design.

[0142] In some embodiments, such as Figure 7 As shown, the planarization layer 03 includes at least one third recess 223, and the third recess 223 includes a third opening 2230. For example, the third opening 2230 faces the side of the planarization layer 03 away from the substrate 01. The orthographic projection of the second recess 222 on the substrate 01 at least partially overlaps with the orthographic projection of the third recess 223 on the substrate 01. For example, the orthographic projection area of ​​the second recess 222 on the substrate 01 is not greater than the orthographic projection area of ​​the third recess 223 on the substrate 01.

[0143] This configuration allows for an increase in the thickness of the portion where the first limiting portion and the second recess overlap (e.g., in the thickness direction of the first limiting portion) before the second recess is formed. This increases the depth of the second recess when it is formed, which in turn increases the depth of the first recess when the second limiting portion forms the first recess, thereby enhancing the thinning capability of the first recess on the light-emitting functional layer.

[0144] In some embodiments, such as Figure 7 As shown, the orthographic projection of the first recess 221 on the substrate 01 and the orthographic projection of the third recess 223 on the substrate 01 at least partially overlap. For example, the orthographic projection of the first recess 221 on the substrate 01 falls into the orthographic projection of the second recess 222 on the substrate 01, and the orthographic projection of the second recess 222 on the substrate 01 falls into the orthographic projection of the third recess 223 on the substrate 01, which helps to increase the depth of the first recess, thereby enhancing the ability of the first recess to thin the light-emitting functional layer.

[0145] In some embodiments, reference Figure 7 The depth M1 of the first recess 221 can be greater than the depth M2 of the second recess 222, and the depth M2 of the second recess 222 can be greater than the depth M3 of the third recess 223, but this is not a limitation, and the embodiments of this disclosure do not limit this. For example, in the embodiments of this disclosure, the depth of each recess refers to the maximum dimension of the recess in the direction perpendicular to the substrate. For example, the planarization layer 03, the first limiting layer 210, and the second limiting layer 220 can all be fabricated using a halftone mask, which facilitates the formation of the first recess, the second recess, and the third recess.

[0146] In some embodiments, reference Figure 7 Either the depth M2 of the second recess 222 or the depth M3 of the third recess 223 is 30% to 50% of the thickness t3 of the portion of the planarization layer 03 excluding the third recess 223, such as 30% to 40%, 35% to 45%, or 45% to 50%. The embodiments of this disclosure do not limit this. For example, either the depth M2 of the second recess 222 or the depth M3 of the third recess 223 is 1 to 1.5 micrometers, such as 1.2 micrometers, 1.3 micrometers, or 1.4 micrometers. For example, the thickness t3 of the portion of the planarization layer 03 excluding the third recess 223 can be approximately 3 micrometers, such as 2.9 micrometers or 3.1 micrometers. The embodiments of this disclosure do not limit this.

[0147] This design allows for better control of the depths of the second and third recesses, which in turn helps to increase the depth of the first recess and enhance its ability to thin the light-emitting functional layer.

[0148] In some embodiments, reference Figure 7 The dimension P of the third recess 223 in the arrangement direction (e.g., direction X) of the adjacent sub-pixels 10 located on both sides is 50% to 90% of the thickness of the portion of the planarization layer 03 excluding the third recess 223, such as 50% to 60%, 60% to 70%, 70% to 80%, or 80% to 90%. The embodiments of this disclosure do not limit this. For example, the aforementioned dimension P can be 1.5 to 2.5 micrometers, such as 1.5 to 1.7 micrometers, 1.8 to 2.0 micrometers, 2.1 to 2.3 micrometers, or 2.3 to 2.5 micrometers. The embodiments of this disclosure do not limit this.

[0149] In some embodiments, reference Figure 7 The minimum angle between at least a portion of the side surface of the first recess 221 and the plane parallel to the substrate 01 is the first slope angle α. The minimum angle between the cross-section of the second recess 222 located at the edge of the second opening 2220 and the surface of the first limiting portion 210 away from the substrate 01 is the second slope angle β. The minimum angle between the cross-section of the third recess 223 located at the edge of the third opening 2230 and the plane parallel to the substrate 01 is the third slope angle μ. For example, the first slope angle α, the second slope angle β, and the third slope angle μ are all in the range of 0 to 90 degrees, such as 40 to 60 degrees, 50 to 70 degrees, 67 to 77 degrees, or 70 to 80 degrees. The embodiments of this disclosure do not limit this.

[0150] By ensuring that the first slope angle, the second slope angle, and the third slope angle are all within the range of 0 to 90 degrees, the second and third recesses can have good morphology, which in turn facilitates the first recess to have a greater depth, thereby enhancing the ability of the first recess to thin the light-emitting functional layer.

[0151] In some embodiments, reference Figure 7 The cross-section of any one of the first recess 221, the second recess 222, and the third recess 223 cut by a plane is trapezoidal, rectangular, semi-circular, or polygonal, and the embodiments disclosed herein are not limited in this respect. For example, the plane is parallel to the arrangement direction of two adjacent sub-pixels 10 and perpendicular to the substrate 01, for example, the plane is parallel to the plane containing directions X and Z.

[0152] Figure 8 This is a partial planar schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0153] In some embodiments, such as Figure 8 As shown, the plurality of sub-pixels 10 include a plurality of first sub-pixels 11, a plurality of second sub-pixels 12, and a plurality of third sub-pixels 13. For example, Figure 8 The diagram schematically illustrates the first electrode 110 of each sub-pixel 10 and the light-emitting area A. For example, at least one first recess 221 in the display substrate includes at least one sub-recess 2211, and the orthographic projection of each sub-recess 2211 onto the substrate lies between the orthographic projections of the first electrodes 110 of two adjacent sub-pixels 10 of different colors onto the substrate. For example, a sub-recess 2211 is provided between the first sub-pixel 11 and the adjacent second sub-pixel 12, and a sub-recess 2211 is provided between the first sub-pixel 11 and the adjacent third sub-pixel 13. The provision of sub-recesses facilitates the reduction of the thickness of the light-emitting functional layer, thereby reducing the risk of crosstalk between adjacent sub-pixels and lateral leakage.

[0154] In some embodiments, such as Figure 8 As shown, at least two (e.g., 2, 3, 4, 5, or 6) sub-recesses 2211 are provided in the circumferential direction of the first electrode 110 of at least one sub-pixel 10. For example, each sub-pixel 10 has four sub-recesses 2211 in the circumferential direction of its first electrode 110, which helps to enhance the thinning capability of the light-emitting functional layer.

[0155] In some embodiments, such as Figure 8 As shown, the widths of the multiple sub-recesses 2211 disposed in the circumferential direction of each sub-pixel 10 are approximately equal, but their lengths may be different. Specifically, they can be flexibly set according to the position and size of the first electrode 110 of the sub-pixel 10. The embodiments disclosed herein do not limit this.

[0156] In some embodiments, such as Figure 8 As shown, the orthographic projection of the sub-recessed portion 2211 on the substrate can at least partially overlap with the orthographic projection of the connection portion 1120 of the first electrode 110 of at least one sub-pixel 10 on the substrate, thereby making the spatial arrangement more compact and saving layout space.

[0157] Figure 9 This is a partial planar schematic diagram of another display substrate provided for at least one embodiment of the present disclosure. Figure 9 The display substrate shown is Figure 8 The difference between the display substrates lies in the sub-recessed portion; the rest of the structure is the same and will not be described in detail here.

[0158] In some embodiments, such as Figure 9As shown, the activation voltages of the first sub-pixel 11 and the second sub-pixel 12 are both lower than the activation voltage of the third sub-pixel 13. At least one side of the first electrode 110 of at least one of the first sub-pixels 11 and 12 is provided with a sub-recess 2211, and at least two opposite sides of the first electrode 110 of the third sub-pixel 13 are respectively provided with sub-recesses 2211. For example, any one of the first sub-pixel 11, the second sub-pixel 12, and the third sub-pixel 13 may have a sub-recess 2211 on each opposite side in the X direction. This configuration achieves "bilateral separation" for each sub-pixel 10.

[0159] In some embodiments, such as Figure 9 As shown, the luminous efficiency of the third sub-pixel 13 can be lower than that of the first sub-pixel 11 and the second sub-pixel 12, and its turn-on voltage is higher. This results in a higher current requirement for the third sub-pixel 13 to emit light, thus increasing the risk of lateral leakage. By providing sub-recesses on at least two opposite sides of the third sub-pixel, the risk of lateral leakage can be reduced.

[0160] In some embodiments, reference Figure 9 When the activation voltage of the first sub-pixel 11 and the second sub-pixel 12 is less than the activation voltage of the third sub-pixel 13, the first sub-pixel 11 and the second sub-pixel 12 can also adopt "single-sided isolation", that is, for either the first sub-pixel 11 or the second sub-pixel 12, only a sub-recessed portion needs to be set on one side.

[0161] In some embodiments, such as Figure 9 As shown, the plurality of third sub-pixels 13 include at least two adjacent third sub-pixels 13 located in the same column, and the sub-recesses 2211 disposed on the same side (i.e., the same side in the X direction) of the at least two adjacent third sub-pixels 13 located in the same column are continuously disposed, thereby simplifying the manufacturing process of the sub-recesses. For example, Figure 9 The direction X shown can be the row direction, and the direction Y can be the column direction. For example, the sub-recesses 2211 located on the same side of adjacent third sub-pixels 13 in the same column can also be spaced apart, and the embodiments of this disclosure do not limit this.

[0162] Figure 10 For along Figure 8 The diagram shows the cross-sectional structure cut by line BB'.

[0163] In some embodiments, such as Figure 10As shown, the maximum dimension C1 of the first recess 221 in direction X is 5.5 to 5.8 micrometers, such as 5.5 micrometers, 5.6 micrometers, or 5.7 micrometers. For example, the minimum dimension C2 of the first recess 221 in direction X is 4.5 to 5.3 micrometers, such as 4.9 micrometers, 5.0 micrometers, 5.1 micrometers, or 5.2 micrometers. For example, in direction Y, the distance C3 between the surface of the second limiting portion 220 away from the substrate 01 and the bottom surface of the first recess 221 is 0.5 to 0.9 micrometers, such as 0.6 micrometers, 0.64 micrometers, 0.7 micrometers, 0.78 micrometers, or 0.8 micrometers. For example, in direction Y, the sum of the distance between the surface of the first limiting portion 210 away from the substrate 01 and the bottom surface of the first recess 221 and the aforementioned distance C3 (i.e., distance C4) can be 0.8 to 1.2 micrometers, such as 0.9 micrometers, 1.0 micrometers, or 1.1 micrometers. For example, the dimension C5 of the first limiting portion 210 in the Y direction can be 1.0 to 1.7 micrometers, such as 1.0 micrometer, 1.3 micrometer, 1.4 micrometer, 1.5 micrometer, or 1.6 micrometer. For example, the dimension C6 of the portion of the second limiting portion 220 that contacts the film layer 001 in the X direction can be 1.0 to 1.4 micrometers, such as 1.1 micrometer, 1.2 micrometer, or 1.3 micrometer. For clarity, Figure 10 The specific structure of film layer 001 is omitted. For example, film layer 001 may include the structure located between the first limiting layer 210 and the substrate 01 in the above embodiments, such as isolation structure 230, planarization layer 03, film layer 02, etc. The embodiments of this disclosure do not limit this.

[0164] Figure 11 A partial plan view of another display substrate provided for at least one embodiment of the present disclosure; Figure 12 for Figure 11 A partially enlarged schematic diagram of the display substrate; Figure 13 For along Figure 12 A schematic diagram of the cross-sectional structure intercepted by line CC' is shown. For example, Figure 11 The substrate, pixel confinement layer, and light-emitting functional layer in the display substrate shown can be combined with... Figure 2 The substrate, pixel definition layer, and light-emitting functional layer in the display substrate shown have the same characteristics, and will not be described again here.

[0165] In some embodiments, such as Figures 11-13As shown, the display substrate also includes an auxiliary electrode 300, which is located on the same layer as the first electrode 110 of the sub-pixel 10 and is spaced apart. For example, the auxiliary electrode 300 can be disposed on the same layer as the first electrode 110, i.e., using the same material and formed by the same patterning process. For example, the second electrodes 120 of multiple sub-pixels 10 are disposed consecutively, and the second electrodes 120 of the sub-pixels 10 are electrically connected to the auxiliary electrode 300. That is, the second electrodes 120 between adjacent sub-pixels 10 are not isolated by the isolation structure 230 in the above embodiment (see [link to embodiment]). Figure 2 The second electrode 120 of adjacent sub-pixels 10 is continuously arranged and electrically connected to the auxiliary electrode 300, thereby reducing the resistance of the second electrode through the auxiliary electrode to enhance the current transmission performance and make the current density in the second electrode uniformly distributed, so as to reduce the color difference.

[0166] In some embodiments, such as Figure 13 As shown, the display substrate also includes a conductive pattern layer SD, which is located between the auxiliary electrode 300 and the substrate 01, and the auxiliary electrode 300 is electrically connected to the conductive pattern layer SD. For example, the conductive pattern layer SD can be one of the multilayer films in film layer 02, but is not limited thereto.

[0167] By electrically connecting the auxiliary electrode to the conductive pattern layer, the conductive pattern layer can receive electrical signals from the second electrode. This allows the conductive pattern layer to further reduce the resistance of the second electrode, resulting in a more uniform distribution of current density within the display substrate. For example, in the case of lateral leakage in a sub-pixel, when the sub-pixel is lit, the consistent voltage of the second electrode leads to a more uniform display effect when adjacent sub-pixels are lit due to the lateral leakage. Therefore, the effect of using an isolation structure to improve the lateral leakage of sub-pixels becomes more consistent, ultimately contributing to better display uniformity.

[0168] In some embodiments, such as Figure 11 As shown, the auxiliary electrode 300 includes a main structure 3000, a first auxiliary electrode portion 310, and a second auxiliary electrode portion 320. The first auxiliary electrode portion 310 and the second auxiliary electrode portion 320 are spaced apart. The main structure 3000 includes a plurality of sub-main body portions 3010. The first auxiliary electrode portion 310 and the adjacent second auxiliary electrode portion 320 are connected through the sub-main body portions 3010. For example, the orthographic projection of the sub-main body portion 3010 on the substrate is elongated, and the orthographic projections of the first auxiliary electrode portion 310 and the second auxiliary electrode portion 320 on the substrate are both circular, but this is not a limitation, and the embodiments disclosed herein are not limited thereto.

[0169] In some embodiments, such as Figure 11 and Figure 13As shown, the second electrode 120 of sub-pixel 10 is electrically connected to the first auxiliary electrode portion 310 through the first via N1, and the main body structure 3000 is electrically connected to the conductive pattern layer SD through the second via N2. For example, the first via N1 passes through the first limiting portion and the second limiting portion ( Figure 13 (Illustrated by reference numeral 212). For example, the second via N2 penetrates the planarization layer 03.

[0170] In some embodiments, such as Figure 11 and Figure 12 As shown, the display substrate also includes a support structure PS, which is located on the side of the second auxiliary electrode portion 320 away from the substrate 01 and is in contact with the second auxiliary electrode portion 320. For example, the support structure PS can be used to support the vapor deposition mask, such as a fine metal mask (FMM), used to fabricate the light-emitting functional layer, thereby reducing the risk of the fabrication film of the light-emitting functional layer being scratched.

[0171] In some embodiments, such as Figure 11 As shown, the plurality of sub-pixels 10 include a plurality of first sub-pixels 11, a plurality of second sub-pixels 12, and a plurality of third sub-pixels 13, which constitute repeating units 123. For example, in each repeating unit 123, the first sub-pixels 11 and second sub-pixels 12 are arranged sequentially in a first arrangement direction (i.e., direction Y), and the first sub-pixels 11 and second sub-pixels 12 are located on one side of the third sub-pixel 13 in a second arrangement direction (i.e., direction X), where the first arrangement direction (i.e., direction Y) intersects with the second arrangement direction (i.e., direction X). For example, one of the first sub-pixels 11 and the second sub-pixels 12 can be a red sub-pixel emitting red light, and the other can be a green sub-pixel emitting green light; the third sub-pixel 13 can be a blue sub-pixel emitting blue light. For example, the emission colors of the first sub-pixels 11, second sub-pixels 12, and third sub-pixels 13 can be interchanged. For example, the area of ​​the light-emitting region of the second sub-pixel 12 is smaller than the area of ​​the light-emitting region of the first sub-pixel 11, and the area of ​​the light-emitting region of the first sub-pixel 11 is smaller than the area of ​​the light-emitting region of the third sub-pixel 13. Of course, the embodiments of this disclosure are not limited to this, and the area of ​​the light-emitting region of each sub-pixel can be set according to product requirements. Furthermore, the embodiments of this disclosure do not limit the arrangement of multiple sub-pixels; the arrangement of multiple sub-pixels can be flexibly set according to design needs.

[0172] In some embodiments, such as Figure 11As shown, the display substrate includes a plurality of repeating units 123. The plurality of repeating units 123 are arranged in a first arrangement direction and a second arrangement direction as a plurality of repeating unit rows 1231 and a plurality of repeating unit columns 1232. The plurality of repeating unit rows 1231 are arranged sequentially in the first arrangement direction (i.e., direction Y), and the plurality of repeating unit columns 1232 are arranged sequentially in the second arrangement direction (i.e., direction X).

[0173] In some embodiments, such as Figure 11 As shown, at least one auxiliary electrode 300 is located between two adjacent rows of repeating units 123 in the first arrangement direction, and at least a portion of either the first auxiliary electrode portion 310 or the second auxiliary electrode portion 320 is located between adjacent third sub-pixels 13 in the first arrangement direction. For example, at least one repeating unit row 1231 is provided on each side of the auxiliary electrode 300 in the direction Y. For example, in the direction Y, a first auxiliary electrode portion 310 or a second auxiliary electrode portion 320 is provided between adjacent third sub-pixels 13, thereby making reasonable use of the layout space and allowing multiple sub-pixels 10 to be compactly distributed with the auxiliary electrode 300.

[0174] In some embodiments, such as Figure 12 As shown, the distance R1 between the effective light-emitting area of ​​the third sub-pixel 13 and the first via N1 can be 8 to 10 micrometers, such as 8, 9, or 10 micrometers. For example, the dimension R2 of the support structure PS in the Y direction can be 11 to 15 micrometers, such as 12, 13, or 14 micrometers. For example, the dimension R3 of the effective light-emitting area of ​​the second sub-pixel 12 in the Y direction can be 14 to 17 micrometers, such as 15, 15.9, 16, or 16.5 micrometers. For example, the dimension R4 of the first via N1 in the X direction can be 25 to 30 micrometers, such as 26, 27, 28, or 29 micrometers. For example, the distance R5 between the auxiliary electrode 300 and the first electrode 110 of the third sub-pixel 13 can be 3 to 5 micrometers, such as 3, 4, or 5 micrometers, which can be set according to design requirements.

[0175] Figure 14 A schematic diagram of the stacking of a conductive pattern layer and a first electrode in a display substrate provided for at least one embodiment of the present disclosure; Figure 15 A schematic diagram of a first electrode in a display substrate provided for at least one embodiment of the present disclosure; Figure 16 A schematic diagram of the stacking of a first electrode and an isolation structure in a display substrate provided for at least one embodiment of the present disclosure; Figure 17 A schematic diagram of the stacking of a first electrode, an isolation structure, and a first defining layer in a display substrate provided for at least one embodiment of the present disclosure; Figure 18 For along Figure 16 The diagram shows the cross-sectional structure cut by line DD'.

[0176] In some embodiments, such as Figure 14 and Figure 15 As shown, the first electrode 110 is located on the conductive pattern layer SD, and the auxiliary electrode 300 is electrically connected to the conductive pattern layer SD through the second via N2. For example, the position of the connection portion 1120 of the first electrode 110 of the sub-pixel can be flexibly set according to the structure of the conductive pattern layer SD. For example, in the X direction, at least a portion of the connection portion 1120 of the first electrode 110 can be located outside the main body portion 1110, and the embodiments of this disclosure do not limit this.

[0177] In some embodiments, such as Figure 16 As shown, the isolation structure 230 is located on the first electrode 110, and the edge of the first electrode 110 is covered by the isolation structure 230, thereby protecting the edge of the first electrode of the sub-pixel. This prevents the dry etching gas from etching or corroding the first electrode of the sub-pixel during the formation of the isolation structure, such as when using a dry etching process. For example, as... Figure 16 and Figure 18 As shown, the first electrode 110 of the sub-pixel is electrically connected to the conductive pattern layer SD through a via N. For example, the conductive pattern layer SD may include multiple signal lines, and the first electrode 110 of the sub-pixel may be electrically connected to one of the multiple signal lines to receive a driving signal.

[0178] In some embodiments, such as Figure 16 and Figure 17 As shown, a first limiting portion 210 is provided on the side of the isolation structure 230 away from the first electrode 110. For example, the first limiting portion 210 is black, thereby masking the area between adjacent sub-pixels 10 to improve the immersion and contrast of the displayed image, making the user's viewing experience better.

[0179] In some embodiments, a schematic diagram of the stacked structure of the first electrode, the isolation structure, the first limiting layer, and the second limiting layer in the display substrate can be referred to the above. Figure 1 Or Figure 5, which will not be explained in detail here.

[0180] At least one embodiment of this disclosure also provides another display substrate, which includes: a substrate, a plurality of sub-pixels, and a pixel defining layer. The plurality of sub-pixels are located on the substrate, and each sub-pixel includes a light-emitting functional layer and a first electrode and a second electrode located on both sides of the light-emitting functional layer in a direction perpendicular to the substrate. The first electrode is located between the light-emitting functional layer and the substrate. At least a portion of the pixel defining layer is located on the side of the first electrode away from the substrate. The pixel defining layer includes a plurality of pixel openings and a pixel defining portion surrounding the plurality of pixel openings. The plurality of pixel openings are configured to define an effective light-emitting area of ​​the plurality of sub-pixels. The pixel defining portion includes a first defining portion and a second defining portion stacked in a direction away from the substrate. The first defining portion is larger than the second defining portion. The pixel defining portion is closer to the substrate, and the transmittance of the first defining portion and the second defining portion are different. The pixel defining portion also includes an isolation structure. The isolation structure, the first defining portion and the second defining portion are stacked in a direction away from the substrate. At least a portion of the first defining portion is located between the isolation structure and the second defining portion. The isolation structure covering the first electrode of the same sub-pixel includes a first sub-isolation structure and a second sub-isolation structure. The portion of the first sub-isolation structure located on the first electrode includes a protrusion that protrudes relative to the edge of the second defining portion. The thickness of at least one of the light-emitting functional layers at the edge of the protrusion is less than the thickness of the portion of the light-emitting functional layer located in the pixel opening. The orthographic projection of the second sub-isolation structure on the substrate falls into the orthographic projection of the second defining portion on the substrate.

[0181] In at least one embodiment of the display substrate provided by this disclosure, the first limiting portion and the second limiting portion have different transmittance, which is beneficial to improving the immersion and contrast of the displayed image and making the user's viewing experience better. The second limiting portion is disposed on the side of the first limiting portion away from the substrate, which can improve the impact caused by the large surface roughness of the first limiting portion. It can reduce the risk of burrs generated by directly patterning the first limiting portion, which may pierce or block other film layers (such as the second electrode), and can weaken the outgas phenomenon of the first limiting portion, reduce the amount of gas released, and thus reduce the risk of black spots or dark areas, thereby improving display uniformity. In addition, at least one layer of the light-emitting functional layer can be thinned or separated by the first sub-isolation structure to reduce the risk of crosstalk between adjacent sub-pixels. Since the orthographic projection of the second sub-isolation structure on the substrate falls into the orthographic projection of the second limiting portion on the substrate, it is beneficial to ensure the continuity of the second electrodes of adjacent sub-pixels.

[0182] like Figure 1 and Figure 2As shown, the display substrate includes a substrate 01, a plurality of sub-pixels 10 located on the substrate 01, and a pixel defining layer 20. Each sub-pixel 100 includes a light-emitting functional layer 130 and a first electrode 110 and a second electrode 120 located on both sides of the light-emitting functional layer 130 along a direction perpendicular to the substrate 01. The first electrode 110 is located between the light-emitting functional layer 130 and the substrate 01. For example, the display substrate includes a display area and a peripheral area surrounding the display area. The plurality of sub-pixels 100 are located in the display area of ​​the display substrate, and the pixel defining layer 20 may include a portion located in the display area and a portion located in the peripheral area.

[0183] like Figure 1 and Figure 2 As shown, at least a portion of the pixel defining layer 20 is located between the light-emitting functional layer 130 and the first electrode 110. The pixel defining layer 20 includes a plurality of pixel openings 201 and a pixel defining portion 200 surrounding the plurality of pixel openings 201. The pixel openings 201 expose at least a portion of the first electrode 110 and are configured to define an effective light-emitting area of ​​the sub-pixel 10. The light-emitting functional layer 130 is disposed in contact with the first electrode 110 through the pixel openings 201. For example, the first electrode 110 and the second electrode 120 located on both sides of the light-emitting functional layer 130 can drive the light-emitting functional layer 130 located between them to emit light. For example, the shape of the effective light-emitting area of ​​the sub-pixel 10 refers to a two-dimensional shape. For example, the shape of the effective light-emitting area may be the same as the shape of the orthographic projection of the portion of the first electrode 110 exposed by the pixel openings 201 onto the substrate 01.

[0184] like Figure 1 and Figure 2 As shown, the pixel defining portion 200 includes a first defining portion 210 and a second defining portion 220 stacked in a direction away from the substrate 01, wherein the first defining portion 210 is closer to the substrate 01 than the second defining portion 220. For example, the first defining portion 210 and the second defining portion 220 are part of the pixel defining portion 200, that is, the pixel defining portion 200 may also include other structures besides the first defining portion 210 and the second defining portion 220 (e.g., the isolation structure 230 described later).

[0185] like Figure 1 and Figure 2 As shown, the transmittance of the first limiting portion 210 is different from that of the second limiting portion 220. For example, the transmittance of the first limiting portion 210 is less than that of the second limiting portion 220. For example, the second limiting portion 210 may be made of a transparent material. For example, the second limiting portion 210 may be made of photosensitive polyimide, but the embodiments of this disclosure are not limited thereto.

[0186] like Figure 1 and Figure 2As shown, the pixel limiting portion 200 also includes an isolation structure 230. The isolation structure 230, the first limiting portion 210 and the second limiting portion 220 are stacked in a direction away from the substrate 01, and at least a portion of the first limiting portion 210 is located between the isolation structure 230 and the second limiting portion 220.

[0187] like Figure 1 and Figure 2 As shown, the isolation structure 230 covering the first electrode 110 of the same sub-pixel 10 includes a first sub-isolation structure 2301 and a second sub-isolation structure 2302. The portion of the first sub-isolation structure 2301 located on the first electrode 110 includes a protrusion 2332 that protrudes relative to the edge of the second limiting portion 220. The thickness of at least one of the light-emitting functional layers 130 at the edge of the protrusion 2330 is less than the thickness of the portion of the light-emitting functional layer 130 located in the pixel opening 201. The orthographic projection of the second sub-isolation structure 2302 onto the substrate 01 falls within the orthographic projection of the second limiting portion onto the substrate 01. For example, at least one of the light-emitting functional layers 130 is interrupted at the edge of the protrusion 2332 of the first sub-isolation structure 2301. For example, the second sub-isolation structure 2302 is covered by the second limiting portion 2320, thereby allowing the light-emitting functional layers 130 to be continuous at the second sub-isolation structure 2302.

[0188] In at least one embodiment of the display substrate provided by this disclosure, the first limiting portion and the second limiting portion have different transmittance, which is beneficial to improving the immersion and contrast of the displayed image and making the user's viewing experience better. The second limiting portion is disposed on the side of the first limiting portion away from the substrate, which can improve the effect caused by the large surface roughness of the first limiting portion. It can reduce the risk of burrs generated by directly patterning the first limiting portion, which may pierce or block other film layers (such as the second electrode), and can weaken the outgas phenomenon of the first limiting portion, reduce the amount of gas released, and thus reduce the risk of black spots or dark areas, thereby improving display uniformity. In addition, at least one layer of the light-emitting functional layer can be thinned or separated by the first sub-isolation structure to reduce the risk of crosstalk between adjacent sub-pixels. Since the orthographic projection of the second sub-isolation structure on the substrate falls into the orthographic projection of the second limiting portion on the substrate, it is beneficial to ensure the continuity of the second electrodes of adjacent sub-pixels.

[0189] In some embodiments, such as Figure 2 As shown, the first limiting portion 210 can be black. For example, the first limiting portion 210 may include a negative photoresist containing black pigment (such as carbon black, titanium black, etc.), and its components may include a resin containing double bonds, an initiator, and a crosslinking agent. This configuration helps to further improve the immersion and contrast of the displayed image, enhancing the user's viewing experience.

[0190] In some embodiments, such as Figure 6 As shown, the second defining portion 220 includes at least one first recess 221, and the first recess 221 includes a first opening 2210. For example, the first opening 2210 faces the side of the second defining portion 220 away from the substrate 01. The light-emitting functional layer 130 includes a first portion 1301 located in the first recess 221 and a second portion 1302 located on the second defining portion 220 and outside the first recess 221. The first portion 1301 and the second portion 1302 are continuously disposed, and the thickness of the first portion 1301 is less than the thickness of the second portion 1302. For example, the first recess 221 can be a groove, and the thickness of at least one film layer of the light-emitting functional layer 130 can be reduced at the groove opening. The first recess 221 extends the charge transport path and increases the resistance, thereby reducing the charge transfer efficiency and reducing the risk of crosstalk between adjacent sub-pixels and lateral leakage.

[0191] In some embodiments, such as Figure 7 As shown, the first defining portion 210 includes at least one second recess 222, and the second recess 222 includes a second opening 2220. The orthographic projection of the first recess 221 on the substrate 01 and the orthographic projection of the second recess 222 on the substrate 01 at least partially overlap. For example, the second opening 2220 faces the side of the first defining portion 210 away from the substrate 01. For example, the orthographic projection of the first recess 221 on the substrate 01 falls within the orthographic projection of the second recess 222 on the substrate 01. For example, the orthographic projection area of ​​the first recess 221 on the substrate 01 is not greater than the orthographic projection area of ​​the second recess 222 on the substrate 01.

[0192] This configuration allows for an increase in the thickness of the portion where the second limiting portion and the second recess overlap (e.g., in the thickness direction of the second limiting portion) before the first recess is formed. This increases the depth of the first recess during its formation, thereby enhancing the thinning capability of the first recess for the light-emitting functional layer.

[0193] It should be noted that for other structures of the sub-pixels in the alternative display substrate provided in at least one embodiment of this disclosure, such as the first electrode, the second electrode, and the light-emitting functional layer, please refer to the relevant descriptions in the foregoing embodiments, and they will not be repeated here. Similarly, for structures such as the pixel defining layer, the isolation structure, the first recess, and the second recess, please refer to the relevant descriptions in the foregoing embodiments, and they will not be repeated here.

[0194] Figure 19 This is a schematic block diagram of a display device provided according to another embodiment of the present disclosure. Figure 19 As shown, an embodiment of this disclosure provides a display device including any of the above-described display substrates.

[0195] For example, a display device may or may not have a color filter layer.

[0196] For example, the display device also includes a cover plate located on the light-emitting side of the array substrate.

[0197] For example, the display device can be an organic light-emitting diode display device or other display device, as well as any product or component with display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator that includes the display device. This embodiment is not limited to this.

[0198] At least one embodiment of this disclosure also provides a method for manufacturing a display substrate. Figures 20-30 A flowchart illustrating a method for manufacturing a display substrate according to an embodiment of this disclosure.

[0199] like Figure 20 As shown, the method for manufacturing a display substrate provided in the embodiments of this disclosure includes:

[0200] A first electrode 110 of the sub-pixel 10 is formed on the substrate 01. For example, the first electrode 110 can be formed by a patterning process of a conductive material.

[0201] Then, as Figure 21 and Figure 22 As shown, the method for fabricating the display substrate further includes: forming a first limiting portion 210 on the side of the first electrode 110 away from the substrate 01, and forming a second limiting portion 220 on the side of the first limiting portion 210 away from the substrate 01. The first limiting portion 210 is black, and the material of the first limiting portion 210 is different from the material of the second limiting portion 220. For example, the first limiting portion 210 may include a negative photoresist containing black pigment (such as carbon black, titanium black, etc.), and its components may include a resin containing double bonds, an initiator, and a crosslinking agent. For example, the second limiting portion 210 may be made of a transparent material. For example, the second limiting portion 210 may be made of photosensitive polyimide, but the embodiments of this disclosure are not limited thereto.

[0202] like Figure 21 and Figure 22 As shown, the first limiting portion 210 and the second limiting portion 220 constitute a part of the pixel limiting portion 200 of the pixel limiting layer 20. See also Figure 2 The pixel defining layer 20 includes a plurality of pixel openings 201, the pixel defining portion 200 surrounds the plurality of pixel openings 201, and the plurality of pixel openings 201 are configured to define the effective light-emitting area of ​​the sub-pixel 10. For example, the structure of the first defining portion 210 and the second defining portion 220 can be found in the above description of... Figure 2 Related explanations.

[0203] The method for manufacturing a display substrate provided in the embodiments of this disclosure improves the immersion and contrast of the displayed image by forming a black first defining portion, thereby enhancing the user's viewing experience. Furthermore, by forming a second defining portion on the side of the first defining portion away from the substrate, the impact of the large surface roughness of the first defining portion can be mitigated, reducing the risk of burrs generated by directly patterning the first defining portion, which could then pierce or block other film layers (such as the cathode). It also weakens the outgassing phenomenon of the black first defining portion, reducing the amount of gas released and thus reducing the risk of black spots or dark areas, thereby improving display uniformity.

[0204] In some embodiments, such as Figures 20-23 As shown, before forming the first limiting portion 210 on the side of the first electrode 110 away from the substrate 01, the method for manufacturing the display substrate further includes forming an isolation structure 230 on the side of the first electrode 110 away from the substrate 01. For example, forming the isolation structure 230 may include: sequentially forming a first isolation material layer on the side of the first electrode 110 away from the substrate 01, and performing a patterning process on the first isolation material layer to form a first isolation portion 2310, wherein the edge of the orthographic projection of the first electrode 110 on the substrate 01 is located within the orthographic projection of the first isolation portion 2310 on the substrate 01. Then, forming a second isolation material layer on the side of the first isolation portion 2310 away from the substrate 01, and performing a patterning process on the second isolation material layer to form a second isolation portion 2320. Finally, forming a third isolation material layer on the side of the second isolation portion 2320 away from the substrate 01, and performing a patterning process on the third isolation material layer to form a third isolation portion 2330. The isolation structure 230 covers the edge of the first electrode 110, and the formed isolation structure 230, the first limiting portion 210, and the second limiting portion 220 constitute the pixel limiting portion 200 of the pixel limiting layer 20 (see [link]). Figure 2 For example, the first isolation portion 2310 and the third isolation portion 2330 may be made of the same material, such as silicon oxide (SiOx) or silicon dioxide (SiO2), and the second isolation portion 2320 may include silicon nitride (SiNx).

[0205] In some embodiments, such as Figures 24A-24BAs shown, a protective structure 250 is formed on the side of the isolation structure 230 away from the substrate 01. For example, a protective material layer P1 is formed on the side of the isolation structure 230 away from the substrate 01, and then the protective material layer P1 is patterned to form the protective structure 250. The isolation structure 230 includes an edge structure ES located on the first electrode 110, and the protective structure 250 covers at least a portion of the edge structure ES. For example, the protective structure 250 can be made of photopolymer resin (PR), but is not limited to this. It should be noted that only a portion of the edge structure ES of the isolation structure 230 located on the first electrode 110 may be covered by the protective structure 250, and the other portion may not be covered by the protective structure 250. For example, the portion of the edge structure ES covered by the protective structure 250 (e.g., corresponding to the first sub-isolation structure 2301 in the above embodiment) can be used for subsequent processing of the light-emitting functional layer 130 (see [link to documentation]). Figure 2 At least a portion of the membrane layer is isolated, while the edge structure ES not covered by the protective structure 250 (e.g., corresponding to the second sub-isolation structure 2302 in the above embodiment) will be covered by the first limiting portion 210 and the second limiting portion 220.

[0206] In some embodiments, such as Figure 25 and Figure 26 As shown, after the protective structure 250 is formed, the first limiting portion 210 is formed. For example, a first limiting material 0210 is formed on the side of the protective structure 250 away from the substrate 01, and then the first limiting portion 210 is formed by performing a patterning process (such as exposure, development, curing, etc.) on the first limiting material 0210.

[0207] In some embodiments, such as Figure 27 As shown, after the first limiting portion 210 is formed, the second limiting portion 220 is formed. For example, the second limiting portion 220 can be formed using a process similar to that of the first limiting portion 210, which will not be described in detail here.

[0208] In some embodiments, such as Figure 2 as well as Figure 28 As shown, after forming the second limiting portion 220, the method for manufacturing the display substrate further includes: removing the protective structure 250, and forming a light-emitting functional layer 130 of the sub-pixel 10 on the side of the second limiting portion 220 away from the substrate 01 and within the pixel opening 201. The thickness of the light-emitting functional layer 130 at the edge portion E of the isolation structure 230 is less than the thickness of the portion of the light-emitting functional layer 130 located in the pixel opening 201. For example, the specific structure of the light-emitting functional layer 130 can be found in the above embodiment regarding... Figure 2 The relevant explanations will not be repeated here.

[0209] By forming a protective structure on the side of the isolation structure away from the substrate, and ensuring that at least a portion of the edge structure of the isolation structure is covered by the protective structure, residual structures can be prevented from remaining in the isolation structure (e.g., in the recessed area between the first and third isolation portions) during the formation of the first and second limiting portions. This helps ensure the thinning capability of the isolation structure for the light-emitting functional layer, and helps ensure that the sub-pixels can be lit normally, so that the sub-pixels have high luminous efficiency and long lifespan, which helps improve product quality.

[0210] It should be noted that the curing process during the formation of the first defining portion can also be performed after the protective structure is removed, and the embodiments of this disclosure do not limit this. For example, a full-surface exposure process can be used when forming the first defining portion, and the specific choice can be made according to the needs.

[0211] In some embodiments, such as Figure 29 and Figure 30 As shown, the method for manufacturing the display substrate may further include: forming a first recess 221 on the side of the second defining portion 220 away from the substrate 01. For example, a photosensitive resin pattern 0221 may be formed on the second defining portion 220, and after forming the first recess 221 by an exposure process, the photosensitive resin pattern 0221 may be removed by etching, peeling, or other processes. The embodiments disclosed herein do not limit this process. For the structure of the first recess 221, please refer to the above embodiments (e.g., regarding...). Figure 6 , Figure 7 The relevant explanations for (etc.) will not be repeated here.

[0212] The following points need to be explained:

[0213] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure, and other structures can be referred to the general design.

[0214] (2) Where there is no conflict, features of the same embodiment and different embodiments of this disclosure may be combined with each other.

[0215] The above description is merely an exemplary embodiment of this disclosure and is not intended to limit the scope of protection of this disclosure, which is determined by the appended claims.

Claims

1. A display substrate, characterized in that, include: Substrate; Multiple sub-pixels are located on the substrate. Each sub-pixel includes a light-emitting functional layer and a first electrode and a second electrode located on both sides of the light-emitting functional layer in a direction perpendicular to the substrate. The first electrode is located between the light-emitting functional layer and the substrate. A pixel defining layer, at least partially located on the side of the first electrode away from the substrate, the pixel defining layer including a plurality of pixel openings and a pixel defining portion surrounding the plurality of pixel openings, the plurality of pixel openings being configured to define the effective light-emitting area of ​​the plurality of sub-pixels; The pixel defining portion includes a first defining portion and a second defining portion stacked in a direction away from the substrate. The first defining portion is closer to the substrate than the second defining portion. The first defining portion is black in color and the material of the first defining portion is different from that of the second defining portion.

2. The display substrate according to claim 1, characterized in that, The pixel defining portion further includes an isolation structure, wherein the isolation structure, the first defining portion, and the second defining portion are stacked in a direction away from the substrate, and at least a portion of the first defining portion is located between the isolation structure and the second defining portion. The isolation structure includes an edge portion located on the first electrode, and the thickness of the light-emitting functional layer at the edge portion is less than the thickness of the portion of the light-emitting functional layer located in the pixel opening.

3. The display substrate according to claim 2, characterized in that, The isolation structure includes a first isolation portion, a second isolation portion, and a third isolation portion stacked sequentially. The second isolation portion is located between the first isolation portion and the third isolation portion, and the third isolation portion is further away from the substrate than the first isolation portion. The second isolation portion and the third isolation portion are made of different materials. The third isolation portion includes a first protrusion that protrudes relative to the second isolation portion, and the light-emitting functional layer includes multiple film layers, at least one of which is broken at the edge of the first protrusion.

4. The display substrate according to claim 3, characterized in that, The pixel defining layer further includes a plurality of first defining openings, and the second defining portion is configured to define the plurality of first defining openings; The isolation structure and the second limiting portion are configured to jointly define the plurality of pixel openings, the plurality of first limiting openings correspond one-to-one with the plurality of pixel openings, and the orthographic projection of the pixel opening on the substrate falls into the orthographic projection of the first limiting opening on the substrate.

5. The display substrate according to claim 4, characterized in that, At least a portion of the isolation structure located on the first electrode includes a second protrusion that protrudes relative to the edge of the second defining portion, and at least one of the light-emitting functional layers is broken at the edge of the second protrusion; The minimum distance between the edges of the second protrusion and the second limiting portion projected onto the first electrode of the same sub-pixel is 1 to 2 micrometers.

6. The display substrate according to claim 4, characterized in that, The pixel defining layer further includes a plurality of second defining openings, and the first defining portion is configured to define the plurality of second defining openings; The orthographic projection of the first defined opening on the substrate falls into the orthographic projection of the second defined opening on the substrate.

7. The display substrate according to any one of claims 3-6, characterized in that, The first protrusion has a dimension of 100-110 nanometers in the protrusion direction of the third isolation portion relative to the second isolation portion, and the isolation structure has a dimension of 70-80 nanometers in the direction perpendicular to the substrate.

8. The display substrate according to claim 5, characterized in that, The isolation structure of the first electrode covering the same sub-pixel includes a first sub-isolation structure and a second sub-isolation structure; The portion of the first sub-isolation structure located on the first electrode includes the second protrusion, and the orthographic projection of the second sub-isolation structure on the substrate falls into the orthographic projection of the second limiting portion on the substrate.

9. The display substrate according to claim 8, characterized in that, The first electrode of the sub-pixel includes a main body portion and a connecting portion connected to each other. At least a portion of the main body portion is exposed by the pixel opening. The sub-pixel also includes a pixel driving circuit electrically connected to the connecting portion and configured to provide a driving signal. The orthographic projection of the main body onto the substrate is a polygon, and at least one side of the polygon falls into the orthographic projection of the first sub-isolation structure onto the substrate.

10. The display substrate according to any one of claims 2-6, characterized in that, The orthographic projection of the edge of the first electrode of each sub-pixel onto the substrate lies within the range of the orthographic projection of the isolation structure onto the substrate.

11. The display substrate according to claim 9, characterized in that, The connection portion of the first electrode of the sub-pixel is covered by the isolation structure.

12. The display substrate according to claim 11, characterized in that, The plurality of sub-pixels includes first sub-pixels and second sub-pixels that are adjacent to each other. The connection portion of the first electrode in the first sub-pixel and the connection portion of the first electrode in the second sub-pixel are both located between the light-emitting areas of the first sub-pixel and the light-emitting areas of the second sub-pixel. The isolation structure covering the connection portion of the first electrode in the first sub-pixel is continuously disposed with the isolation structure covering the connection portion of the first electrode in the second sub-pixel.

13. The display substrate according to claim 1, characterized in that, In a direction perpendicular to the substrate, the distance between the surface of the second defining portion away from the substrate and the substrate is non-uniform.

14. The display substrate according to claim 13, characterized in that, In a direction perpendicular to the substrate, at least a portion of the surface of the second defining portion away from the substrate protrudes in a direction away from the substrate.

15. The display substrate according to claim 14, characterized in that, The second defining portion includes at least one first recess, the first recess including a first opening. The light-emitting functional layer includes a first portion located in the first recess and a second portion located on the second limiting portion and outside the first recess. The first portion and the second portion are continuously disposed, and the thickness of the first portion is less than the thickness of the second portion.

16. The display substrate according to claim 15, characterized in that, The minimum distance between the first recess and the first limiting portion is greater than zero.

17. The display substrate according to claim 15 or 16, characterized in that, The first defining portion includes at least one second recess, the second recess includes a second opening, and the orthographic projection of the first recess on the substrate and the orthographic projection of the second recess on the substrate at least partially overlap.

18. The display substrate according to claim 17, characterized in that, At least a portion of the first recess is located within the second recess.

19. The display substrate according to claim 17, characterized in that, The display substrate further includes a planarization layer located between the first electrode of the sub-pixel and the substrate, with at least a portion of the first defining portion located on the planarization layer. The planarization layer includes at least one third recess, the third recess including a third opening, and the orthographic projection of the second recess on the substrate at least partially overlaps with the orthographic projection of the third recess on the substrate.

20. The display substrate according to claim 19, characterized in that, The orthographic projection of the first recess on the substrate and the orthographic projection of the third recess on the substrate at least partially overlap.

21. The display substrate according to claim 19, characterized in that, The cross-section of any one of the first recess, the second recess, and the third recess, when cut by a plane, is trapezoidal, rectangular, semi-circular, or polygonal. The plane is parallel to the arrangement direction of two adjacent sub-pixels and perpendicular to the substrate.

22. The display substrate according to claim 15, characterized in that, The portion of the first part covering the surface of the first recess has a first thickness, the second part has a second thickness, and the first thickness is at least 50% of the second thickness.

23. The display substrate according to claim 19, characterized in that, The maximum dimension of either the second recess or the third recess in the direction perpendicular to the substrate is 30% to 50% of the thickness of the portion of the planarization layer excluding the third recess, and the dimension of the third recess in the direction of arrangement of adjacent sub-pixels on both sides of it is 50% to 90% of the thickness of the portion of the planarization layer excluding the third recess.

24. The display substrate according to claim 19, characterized in that, The minimum angle between at least a portion of the side surface of the first recess and the plane parallel to the substrate is a first slope angle; the minimum angle between the tangent plane of the second recess located at the edge of the second opening and the surface of the first defining portion away from the substrate is a second slope angle; and the minimum angle between the tangent plane of the third recess located at the edge of the third opening and the plane parallel to the substrate is a third slope angle. The first slope angle, the second slope angle, and the third slope angle are all within the range of 0 to 90°.

25. The display substrate according to any one of claims 2-6, characterized in that, The maximum thickness of the second limiting portion is greater than the thickness of the edge portion of the second limiting portion that contacts the isolation structure.

26. The display substrate according to claim 15, characterized in that, The at least one first recess includes at least one sub-recess, the orthographic projection of which lies between the orthographic projections of the first electrodes of two adjacent sub-pixels of different colors onto the substrate. At least two spaced sub-recesses are provided in the circumferential direction of the first electrode of at least one sub-pixel.

27. The display substrate according to claim 26, characterized in that, The plurality of sub-pixels includes a plurality of first sub-pixels, a plurality of second sub-pixels, and a plurality of third sub-pixels, wherein the activation voltage of the first sub-pixels and the second sub-pixels is lower than the activation voltage of the third sub-pixels. The sub-recessed portion is provided on at least one side of the first electrode of at least one of the first sub-pixel and the second sub-pixel, and the sub-recessed portion is provided on at least two opposite sides of the first electrode of the third sub-pixel.

28. The display substrate according to claim 27, characterized in that, The plurality of third sub-pixels includes at least two adjacent third sub-pixels located in the same column, and sub-recesses are continuously disposed on the same side of the two adjacent third sub-pixels located in the same column.

29. The display substrate according to any one of claims 1-6, characterized in that, Also includes: An auxiliary electrode is provided, which is located on the same layer as the first electrode of the sub-pixel and is spaced apart from it. The second electrodes of the plurality of sub-pixels are arranged continuously. The second electrode of the sub-pixel is electrically connected to the auxiliary electrode.

30. The display substrate according to claim 29, characterized in that, Also includes: Conductive pattern layer, The conductive pattern layer is located between the auxiliary electrode and the substrate, and the auxiliary electrode is electrically connected to the conductive pattern layer.

31. The display substrate according to claim 29, characterized in that, The auxiliary electrode includes a main structure, a first auxiliary electrode portion, and a second auxiliary electrode portion, wherein the first auxiliary electrode portion and the second auxiliary electrode portion are spaced apart. The main structure includes a plurality of sub-main body portions, and the first auxiliary electrode portion is connected to an adjacent second auxiliary electrode portion through the sub-main body portions. The second electrode of the sub-pixel is electrically connected to the first auxiliary electrode via a first via, and the main structure is electrically connected to the conductive pattern layer via a second via. The display substrate further includes a support structure located on the side of the second auxiliary electrode portion away from the substrate and in contact with the second auxiliary electrode portion.

32. The display substrate according to claim 31, characterized in that, The plurality of sub-pixels includes a plurality of first sub-pixels, a plurality of second sub-pixels, and a plurality of third sub-pixels, wherein the first sub-pixels, the second sub-pixels, and the third sub-pixels constitute a repeating unit. The first and second sub-pixels in the repeating unit are arranged sequentially in a first arrangement direction, and the first and second sub-pixels are located on one side of the third sub-pixel in a second arrangement direction. The first arrangement direction intersects the second arrangement direction. At least one auxiliary electrode is located between two adjacent rows of repeating units in the first arrangement direction, and at least a portion of either the first auxiliary electrode portion or the second auxiliary electrode portion is located between adjacent third sub-pixels in the first arrangement direction.

33. A display substrate, characterized in that, include: Substrate; Multiple sub-pixels are located on the substrate. Each sub-pixel includes a light-emitting functional layer and a first electrode and a second electrode located on both sides of the light-emitting functional layer in a direction perpendicular to the substrate. The first electrode is located between the light-emitting functional layer and the substrate. A pixel defining layer, at least partially located on the side of the first electrode away from the substrate, the pixel defining layer including a plurality of pixel openings and a pixel defining portion surrounding the plurality of pixel openings, the plurality of pixel openings being configured to define the effective light-emitting area of ​​the plurality of sub-pixels; The pixel defining portion includes a first defining portion and a second defining portion stacked in a direction away from the substrate. The first defining portion is closer to the substrate than the second defining portion, and the first defining portion and the second defining portion have different transmittance. The pixel defining portion further includes an isolation structure, wherein the isolation structure, the first defining portion, and the second defining portion are stacked in a direction away from the substrate, and at least a portion of the first defining portion is located between the isolation structure and the second defining portion. The isolation structure covering the first electrode of the same sub-pixel includes a first sub-isolation structure and a second sub-isolation structure. The portion of the first sub-isolation structure located on the first electrode includes a protrusion that protrudes relative to the edge of the second defining portion. The thickness of at least one of the light-emitting functional layers at the edge of the protrusion is less than the thickness of the portion of the light-emitting functional layer located in the pixel opening. The orthographic projection of the second sub-isolation structure on the substrate falls into the orthographic projection of the second defining portion on the substrate.

34. The display substrate according to claim 33, characterized in that, The color of the first limiting part is black.

35. The display substrate according to claim 33 or 34, characterized in that, The second defining portion includes at least one first recess, the first recess including a first opening. The light-emitting functional layer includes a first portion located in the first recess and a second portion located on the second limiting portion and outside the first recess. The first portion and the second portion are continuously disposed, and the thickness of the first portion is less than the thickness of the second portion.

36. The display substrate according to claim 35, characterized in that, The first defining portion includes at least one second recess, the second recess includes a second opening, and the orthographic projection of the first recess on the substrate and the orthographic projection of the second recess on the substrate at least partially overlap.

37. A display device, characterized in that, Includes the display substrate according to any one of claims 1-32.

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