Display substrate and display device

Abstract

The invention discloses a display substrate and a display device. The display substrate includes sub-pixels, a pixel defining pattern, and a defining structure. Each sub-pixel comprises a light-emitting functional layer; the pixel limiting pattern comprises an opening and a pixel limiting part surrounding the opening, and at least part of the light-emitting functional layer is separated in at least one opening; the limiting structure is located between the pixel limiting part and the substrate. Each limiting structure is located between every two adjacent sub-pixels with different colors, each limiting structure comprises a first part covered by the corresponding pixel limiting part and a second part exposed by the corresponding opening, and the second parts of the limiting structures are configured to partition the corresponding light-emitting functional layer; the limiting structure comprises an organic material, the orthographic projection of the edge of one side, far away from the substrate, of the side surface of the second part on the substrate falls into the orthographic projection of the opening on the substrate, the light-emitting functional layer is partitioned to reduce crosstalk, the electrode flatness and the normal light emitting effect of the sub-pixel are ensured, and the light emitting efficiency of the sub-pixel is improved. And the influence of the limiting structure on the process and the productivity is reduced to the minimum.

Description

Display substrate and display device Technical Field

[0001] The present disclosure relates to a display substrate and a display device. Background Art

[0002] Organic light-emitting diode (OLED) displays are highly favored by users due to their rich colors, fast response time, and foldability. Currently, users of OLED display devices, such as mobile phones, desire as long standby time and lifespan as possible, placing higher demands on screen design. An organic light-emitting display device with a tandem structure increases the lifespan and brightness of the light-emitting device and reduces power consumption by adding at least one light-emitting layer and a charge-generating layer to the organic light-emitting device, thereby meeting user demands for power consumption and lifespan.

[0003] Summary of the Invention

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

[0005] An embodiment of the present disclosure provides a display substrate, comprising: a base substrate and a plurality of sub-pixels, a pixel defining pattern, and a defining structure located on the base substrate. Each sub-pixel in at least some of the sub-pixels includes a light-emitting functional layer, and the light-emitting functional layer includes a plurality of film layers; the pixel defining pattern includes a plurality of openings and a pixel defining portion surrounding the plurality of openings, and at least a portion of at least one layer of the light-emitting functional layer is isolated in at least one opening; the defining structure is located between the pixel defining portion and the base substrate. The defining structure is located at least between two adjacent sub-pixels of different colors, and the defining structure includes a first portion covered by the pixel defining portion and a second portion exposed by the opening, and the second portion of the defining structure is configured to isolate the at least one layer of the light-emitting functional layer; the material of the defining structure includes an organic material, and the orthographic projection of the edge of the side of the second portion of the defining structure away from the side of the base substrate on the base substrate falls within the orthographic projection of the opening on the base substrate.

[0006] For example, according to an embodiment of the present disclosure, the multiple openings include multiple first openings and multiple second openings, the multiple first openings are configured to define the light-emitting area of ​​at least part of the sub-pixels, at least part of at least one layer of the light-emitting functional layer located in the first opening is a continuous part, and at least part of the layer located in at least one second opening is separated; the second part of the defining structure is exposed by at least one of the first opening and the second opening.

[0007] For example, according to an embodiment of the present disclosure, the thickness of the limiting structure is no more than 5 microns, the edge of the surface on the side away from the substrate in the second part of the limiting structure protrudes relative to the edge of the surface on the side close to the substrate, and the size of the protrusion is no more than 5 microns.

[0008] For example, according to an embodiment of the present disclosure, the angle between the side surface of the second part of the defining structure and the plane of the first surface of the defining structure on the side close to the substrate is greater than 20 degrees and less than 90 degrees; the orthographic projection of the first surface on the substrate falls within the orthographic projection of the second surface of the second part on the side away from the substrate, and the distance between the orthographic projection of the edge of the first surface and the orthographic projection of the edge of the second surface is not greater than 5 microns.

[0009] For example, according to an embodiment of the present disclosure, each sub-pixel in the at least part of the sub-pixels also includes a first electrode and a second electrode located on both sides of the light-emitting functional layer, and the first electrode is located between the light-emitting functional layer and the base substrate; the thickness of the defining structure is greater than the thickness of the first electrode, and the thickness of at least part of the pixel defining portion in a position that does not overlap with the defining structure in a direction perpendicular to the base substrate is greater than the thickness of the defining structure.

[0010] For example, according to an embodiment of the present disclosure, the defining structure covers an edge of the first electrode.

[0011] For example, according to an embodiment of the present disclosure, the multiple openings include multiple first openings, and the multiple first openings are configured to define the light-emitting area of ​​at least part of the sub-pixels, at least part of at least one layer of the light-emitting functional layer located in the first opening is a continuous part, and the second part of the defining structure is at least exposed by the first opening.

[0012] For example, according to an embodiment of the present disclosure, the multiple openings include multiple first openings and multiple second openings, the multiple first openings are configured to define the light-emitting area of ​​at least part of the sub-pixels, at least part of at least one layer of the light-emitting functional layer is located in the first opening as a continuous part, and at least part of the layer located in at least one second opening is separated; the orthographic projection of the defining structure on the base substrate does not overlap with the orthographic projection of the first opening on the base substrate, and the second opening exposes the second part of the defining structure.

[0013] For example, according to an embodiment of the present disclosure, along the arrangement direction of the two adjacent sub-pixels of different colors, the dimension of the first electrode covered by the limiting structure is no greater than 5 micrometers.

[0014] For example, according to an embodiment of the present disclosure, each sub-pixel in at least some of the sub-pixels further includes a first electrode and a second electrode located on both sides of the light-emitting functional layer, the first electrode being located between the light-emitting functional layer and the base substrate; an insulating layer is provided between the first electrode and the base substrate, the first electrode and the defining structure are both in contact with the surface of the insulating layer, and the first electrode and the defining structure are spaced apart, and the distance between the defining structure and the first electrode closest to it is not greater than 10 microns.

[0015] For example, according to an embodiment of the present disclosure, the display substrate further includes: a spacer located on a side of the pixel defining portion away from the base substrate. The material of the defining structure is different from that of the spacer.

[0016] For example, according to an embodiment of the present disclosure, the thickness of the spacer is no greater than 5 micrometers, and the thickness of the pixel defining portion is no greater than 5 micrometers.

[0017] For example, according to an embodiment of the present disclosure, the orthographic projection of the spacer on the base substrate overlaps with the orthographic projection of the limiting structure on the base substrate; or, the orthographic projection of the spacer on the base substrate does not overlap with the orthographic projection of the limiting structure on the base substrate.

[0018] For example, according to an embodiment of the present disclosure, the portion of the defining structure located between the two adjacent sub-pixels of different colors includes at least one sub-defining structure.

[0019] For example, according to an embodiment of the present disclosure, the two adjacent sub-pixels of different colors include a first color sub-pixel and a second color sub-pixel, and the at least one sub-defining structure includes a sub-defining structure, and the edge of the first part of the sub-defining structure is closer to the edge of the light-emitting area of ​​the first color sub-pixel.

[0020] For example, according to an embodiment of the present disclosure, the first color sub-pixel includes a red sub-pixel or a green sub-pixel, and the second color sub-pixel includes a blue sub-pixel.

[0021] For example, according to an embodiment of the present disclosure, the multiple openings include multiple first openings and multiple second openings, the multiple first openings are configured to define the light-emitting area of ​​at least part of the sub-pixels, at least part of at least one layer of the light-emitting functional layer located in the first opening is a continuous part, and at least part of the layer located in at least one second opening is separated; the at least one sub-defining structure includes two sub-defining structures arranged at intervals, the second part of one of the two sub-defining structures is exposed by the first opening, and the second part of the other of the two sub-defining structures is exposed by the second opening.

[0022] For example, according to an embodiment of the present disclosure, the at least one sub-defining structure includes two sub-defining structures spaced apart from each other, and edges of the two sub-defining structures facing each other are exposed by the same opening.

[0023] For example, according to an embodiment of the present disclosure, the multiple openings include multiple first openings and multiple second openings, the multiple first openings are configured to define the light-emitting area of ​​at least part of the sub-pixels, at least one layer of the light-emitting functional layer is located in the first opening, at least part of the continuous portion, and is located in at least one second opening, at least part of the partition; the at least one sub-defining structure includes a sub-defining structure, one side edge of the sub-defining structure is exposed by the first opening, and the other side edge of the sub-defining structure is exposed by the second opening.

[0024] For example, according to an embodiment of the present disclosure, the at least one sub-defining structure includes a ring-shaped sub-defining structure surrounding the light-emitting area of ​​at least one sub-pixel.

[0025] For example, according to an embodiment of the present disclosure, the two sub-definition structures are respectively two annular sub-definition structures surrounding the light-emitting areas of the two adjacent sub-pixels of different colors.

[0026] For example, according to an embodiment of the present disclosure, the first electrode of each sub-pixel includes a main electrode and a connecting electrode, and the main electrode overlaps with the light-emitting area of ​​the sub-pixel and has a similar shape; the positive projection of the connecting electrode of at least one sub-pixel on the base substrate does not overlap with the positive projection of the limiting structure and the opening on the base substrate.

[0027] For example, according to an embodiment of the present disclosure, the multiple openings include multiple first openings and multiple second openings, the multiple first openings are configured to define the light-emitting area of ​​at least part of the sub-pixels, at least part of at least one layer of the light-emitting functional layer is located in the first opening as a continuous part, and is located in at least one second opening as a partition; the limiting structure includes multiple limiting parts and at least part of the connecting part connecting the multiple limiting parts, along the direction perpendicular to the base substrate, the limiting part overlaps with the second opening, and the orthographic projection of the connecting part on the base substrate completely falls within the orthographic projection of the pixel limiting part on the base substrate; the orthographic projection of the spacer on the base substrate completely falls within the orthographic projection of the connecting part on the base substrate.

[0028] For example, according to an embodiment of the present disclosure, at least one second opening is in the shape of a strip, and the at least one second opening is located between the two adjacent sub-pixels of different colors, and the long side of the strip is perpendicular to the arrangement direction of the two adjacent sub-pixels of different colors.

[0029] For example, according to an embodiment of the present disclosure, the long side of the long strip is parallel to the side of the first opening that is closest to it.

[0030] For example, according to an embodiment of the present disclosure, along the extension direction of the sub-defining structure, the length of the opening overlapping with the sub-defining structure is greater than or less than the length of the sub-defining structure.

[0031] Another embodiment of the present disclosure provides a display substrate, comprising: a base substrate, and a plurality of sub-pixels, a pixel defining pattern, and a defining structure located on the base substrate. Each of at least some of the sub-pixels includes a light-emitting functional layer, the light-emitting functional layer including a plurality of film layers; the pixel defining pattern includes a plurality of first openings and a plurality of second openings, and a pixel defining portion surrounding the plurality of first openings and the plurality of second openings. The plurality of first openings are configured to define the light-emitting area of ​​at least some of the sub-pixels; at least a portion of at least one layer of the light-emitting functional layer located in the first openings is continuous, and at least a portion located in at least one second opening is interrupted. The defining structure is located between at least two adjacent sub-pixels of different colors; the defining structure includes a first portion covering the surface of the pixel defining portion on a side away from the base substrate, and a second portion located in the second opening; the second portion of the defining structure is configured to interrupt the at least one layer of the light-emitting functional layer; the defining structure is made of an organic material, and an edge of the second portion of the defining structure on a side away from the base substrate protrudes relative to an edge of the second portion on a side close to the base substrate.

[0032] For example, according to an embodiment of the present disclosure, the edge of the surface of the first part of the limiting structure close to the substrate protrudes relative to the edge of the surface away from the substrate, and the thickness of the first part is smaller than the thickness of the second part at at least part of the position.

[0033] Another embodiment of the present disclosure provides a display device, comprising any of the above-mentioned display substrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0035] FIG1 is a schematic diagram of a partial planar structure provided according to an example of an embodiment of the present disclosure.

[0036] FIG2 is a schematic diagram of a partial cross-section structure taken along line AA′ shown in FIG1 .

[0037] FIG3 is a partial enlarged view of the display substrate shown in FIG1 .

[0038] FIG4 is a schematic diagram of a partial planar structure of a display substrate provided according to another example of an embodiment of the present disclosure.

[0039] FIG5 is a schematic diagram of a partial cross-sectional structure of a display substrate provided according to another example of an embodiment of the present disclosure.

[0040] 6 and 7 are schematic diagrams of partial cross-sectional structures of display substrates provided according to different examples of the embodiment of the present disclosure.

[0041] FIG8 is a schematic diagram of a partial planar structure of a display substrate provided according to another example of an embodiment of the present disclosure.

[0042] FIG9 is a schematic diagram of a partial cross-sectional structure taken along line CC′ shown in FIG8 .

[0043] FIG10 is a schematic diagram of a partial cross-sectional structure of a display substrate provided according to another example of an embodiment of the present disclosure.

[0044] FIG11 is a schematic diagram of a partial planar structure of a display substrate provided according to another example of an embodiment of the present disclosure.

[0045] FIG12 is a schematic diagram of a partial cross-sectional structure taken along line DD′ shown in FIG11 .

[0046] 13 and 14 are schematic diagrams of partial planar structures of display substrates provided according to different examples of the embodiment of the present disclosure.

[0047] FIG15 is a schematic diagram of a partial cross-sectional structure taken along line EE′ shown in FIG13 .

[0048] FIG16 is a schematic diagram of a partial cross-sectional structure taken along line FF′ shown in FIG14 .

[0049] FIG17 is a schematic diagram of a partial planar structure of a display substrate provided according to another example of an embodiment of the present disclosure.

[0050] FIG18 is a partial enlarged view of the display substrate shown in FIG17 .

[0051] FIG19 is a schematic diagram of a partial cross-sectional structure of a display substrate provided according to another embodiment of the present disclosure.

[0052] FIG20 is a schematic block diagram of a display device according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0053] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0054] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the ordinary meaning understood by a person of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are simply used to distinguish different components. The terms "include" or "comprises" and similar terms mean that the element or object preceding the term includes the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The characteristics of "parallel," "perpendicular," and "same" used in the embodiments of this disclosure include the characteristics of "parallel," "perpendicular," and "same" in the strict sense, as well as "approximately parallel," "approximately perpendicular," and "approximately the same" that include certain errors, taking into account the errors associated with the measurement of specific quantities (for example, the limitations of the measurement system), and represent the acceptable deviation range for a specific value determined by a person of ordinary skill in the art. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of the stated value. When the number of a component is not specifically specified below in the embodiments of this disclosure, it means that the component can be one or more, or can be understood as at least one. "At least one" means one or more, and "a plurality" means at least two.

[0055] Tandem technology stacks the sub-pixel's light-emitting layers in series, with a full charge generation layer (CGL) placed between the stacked layers. This layer consists of a P-type doped charge generation layer (P-CGL) and an N-type doped charge generation layer (N-CGL). Compared to display substrates without a Tandem device, a Tandem device uses an N / P-CGL heterojunction, connecting the two light-emitting layers in series. This technology achieves dual-light-emitting device series connection, significantly reducing the device's luminous current while maintaining the same luminous intensity, extending the lifespan of the organic light-emitting element and reducing power consumption.

[0056] During the research, the inventors of the present application found that: on the one hand, the Tandem device uses a stacked light-emitting layer, which places high demands on materials and evaporation; on the other hand, the conductivity of the charge generation layer in the Tandem device is relatively large. For example, when the charge generation layer is a whole-surface film layer, the charge generation layer of two adjacent sub-pixels is a continuous film layer, and there is a phenomenon of lateral charge migration, which causes the display substrate to shift in low grayscale monochrome chromaticity, such as easily causing crosstalk between adjacent sub-pixels, resulting in color deviation of the display substrate. For example, the charge generation layer easily causes crosstalk between sub-pixels of different colors at low brightness, thereby causing low grayscale color deviation.

[0057] The embodiments of the present disclosure provide a display substrate and a display device. The display substrate includes a base substrate, a plurality of sub-pixels located on the base substrate, a pixel defining pattern, and a defining structure. Each sub-pixel in at least some of the sub-pixels includes a light-emitting functional layer, and the light-emitting functional layer includes a plurality of film layers; the pixel defining pattern includes a plurality of openings and a pixel defining portion surrounding the plurality of openings, and at least a portion of at least one layer of the light-emitting functional layer is isolated in at least one opening; the defining structure is located between the pixel defining portion and the base substrate. The defining structure is located at least between two adjacent sub-pixels of different colors, and the defining structure includes a first portion covered by the pixel defining portion and a second portion exposed by the opening, and the second portion of the defining structure is configured to isolate at least one layer of the light-emitting functional layer; the material of the defining structure includes an organic material, and the orthographic projection of the edge of the side of the second portion of the defining structure away from the base substrate on the base substrate falls within the orthographic projection of the opening on the base substrate.

[0058] The first part of the limiting structure using organic materials provided by the present disclosure is covered by the pixel limiting part, and while the second part is exposed by at least one opening, the orthographic projection of the edge of the side of the second part away from the side of the substrate falls within the orthographic projection of the opening on the substrate. This not only can separate at least one layer of the light-emitting functional layer between sub-pixels of different colors to reduce crosstalk, but also can ensure the flatness of the electrode of the sub-pixel and the normal light output effect, while minimizing the impact of the limiting structure on the process and production capacity.

[0059] The display substrate and the display device provided by the embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0060] Fig. 1 is a schematic diagram of a partial planar structure provided according to an example of an embodiment of the present disclosure. Fig. 2 is a schematic diagram of a partial cross-sectional structure taken along line AA' shown in Fig. 1 .

[0061] As shown in Figures 1 and 2, the display substrate includes a base substrate 01, a plurality of sub-pixels 10 located on the base substrate 01, a pixel-defining pattern 200, and a defining structure 300. Each of at least some of the sub-pixels 10 includes a light-emitting functional layer 130, which comprises multiple film layers. For example, at least some of the sub-pixels 10 are located in the display area of ​​the display substrate, i.e., the area used to display images. The display substrate also includes a peripheral area surrounding the display area.

[0062] For example, as shown in Figure 2, the sub-pixel 10 also includes 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 base substrate 01 (such as a direction perpendicular to the XY plane shown in Figure 1), and the first electrode 110 is located between the light-emitting functional layer 130 and the base substrate 01.

[0063] For example, as shown in FIG2 , the light-emitting functional layer 130 may include a light-emitting layer for emitting light and a charge generation 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 (EML) 131, a charge generation layer (CGL) 133, and a second light-emitting layer (EML) 132, which are stacked, with the charge generation layer 133 being located between the first light-emitting layer 131 and the second light-emitting layer 132. The thicknesses of the multiple film layers included in the light-emitting functional layer 130 shown in FIG2 are only for the purpose of clearly illustrating the film layers and do not represent actual sizes.

[0064] For example, as shown in FIG2 , the charge generation layer 133 has strong conductivity, which can make the light-emitting functional layer 130 have the advantages of long life, low power consumption, and high brightness. For example, the same sub-pixel 10 can include a tandem light-emitting element, such as a tandem OLED. Of course, the embodiments of the present disclosure are not limited to this, and the light-emitting functional layer 130 of each sub-pixel 10 can also include only one light-emitting layer.

[0065] For example, as shown in FIG2 , in the same sub-pixel 10, the first light-emitting layer 131 and the second light-emitting layer 132 may be light-emitting layers that emit the same color of light. For example, the first light-emitting layer 131 in the sub-pixel 10 that emits light of different colors emits light of different colors. For example, the second light-emitting layer 132 in the sub-pixel 10 that emits light of different colors emits light of different colors. Of course, the embodiments of the present disclosure are not limited thereto. For example, in the same sub-pixel 10, the first light-emitting layer 131 and the second light-emitting layer 132 may be light-emitting layers that emit light of different colors. By providing light-emitting layers that emit light of different colors in the same sub-pixel 10, the light emitted by the multiple light-emitting layers included in the sub-pixel 10 can be mixed into white light, and the color of the light emitted from each sub-pixel 10 can be adjusted by providing a color filter layer.

[0066] For example, in each sub-pixel 10 , the light emitting functional layer 130 may further include a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL).

[0067] For example, the hole injection layer, the hole transport layer, the electron transport layer, the electron injection layer, the charge generation layer 133 and the second electrode 120 are all common layers of the plurality of sub-pixels 10 and can be referred to as common layers.

[0068] For example, as shown in FIG2 , the second light-emitting layer 132 can be located between the first light-emitting layer 131 and the second electrode 120, and the hole injection layer can be located between the first electrode 110 and the first light-emitting layer 131. For example, an electron transport layer can be disposed between the charge generation layer 133 and the first light-emitting layer 131. For example, a hole transport layer can be disposed between the second light-emitting layer 132 and the charge generation layer 133. For example, an electron transport layer and an electron injection layer can be disposed between the second light-emitting layer 132 and the second electrode 120.

[0069] For example, the charge generation layer 133 may include an N-type charge generation layer and a P-type charge generation layer.

[0070] For example, the materials of the electron transport layer may include aromatic heterocyclic compounds, such as imidazole derivatives such as benzimidazole derivatives, imidazopyridine derivatives, and benzimidazolephenanthridine derivatives; oxazine derivatives such as pyrimidine derivatives and triazine derivatives; quinoline derivatives, isoquinoline derivatives, phenanthroline derivatives, and other compounds containing a nitrogen-containing six-membered ring structure (including compounds having phosphine oxide-based substituents on the heterocyclic ring), etc.

[0071] For example, the material of the charge generation layer 133 may be a material containing a phosphorus-oxygen group or a material containing triazine.

[0072] For example, the ratio of the electron mobility of the material of the charge generation layer 133 to the electron mobility of the electron transport layer is 10 -2 ~10 2 .

[0073] For example, the first electrode 110 may be an anode, and the second electrode 120 may be a cathode. For example, the cathode may be formed of a material with high conductivity and low work function, such as a metal material. For example, the anode may be formed of a transparent conductive material with a high work function.

[0074] 2 schematically shows that there are gaps between the light-emitting layers of different sub-pixels 10. For example, the orthographic projection area of ​​the charge generation layer 133 on the base substrate 01 is larger than the orthographic projection area of ​​any light-emitting layer on the base substrate 01.

[0075] For example, as shown in Figure 2, other structures 02 are also provided on the side of the first electrode 110 facing the base substrate 01, such as pixel circuits, signal lines and various insulating layers electrically connected to the first electrode 110 of the sub-pixel 10, such as a passivation layer, a buffer layer, a gate insulating layer, an interlayer insulating layer, etc.

[0076] As shown in FIG. 1 and FIG. 2 , the pixel defining pattern 200 includes a plurality of openings 201 and a pixel defining portion 230 surrounding the plurality of openings 201 . At least a portion of at least one layer of the light emitting functional layer 130 is separated in at least one opening 201 .

[0077] In some examples, as shown in Figures 1 and 2, the plurality of openings 201 include a plurality of first openings 210 and a plurality of second openings 220. The plurality of first openings 210 are configured to define the light-emitting region 010 of at least a portion of the sub-pixel 10. At least a portion of at least one layer of the light-emitting functional layer 130 located in the first opening 210 is continuous, and at least a portion located in at least one second opening 220 is interrupted. Figures 1 and 2 schematically illustrate that the portion of the film layer in the light-emitting functional layer 130 located in the first opening 210 is continuous, and the portion located in the second opening 220 is interrupted.

[0078] For example, as shown in Figures 1 and 2 , a sub-pixel 10 corresponds to at least one first opening 210. At least a portion of the light-emitting functional layer 130 of the sub-pixel 10 is located in the first opening 210 corresponding to the sub-pixel 10, and the first opening 210 is configured to expose the first electrode 110. Figure 1 only shows the light-emitting region 010 and the first electrode 110 of the sub-pixel, and does not show the second electrode 120. The second electrode 120 may be a continuously disposed film layer at least at a position outside the second opening 220.

[0079] For example, as shown in FIG2 , when the light-emitting functional layer 130 is formed in the first opening 210 of the pixel-defining pattern 200, 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 in the first opening 210 to emit light. For example, the first opening 210 of the pixel-defining pattern 200 is used to define the light-emitting region 010 of the sub-pixel 10. The light-emitting region 010 can refer to the region of the sub-pixel 10 that effectively emits light. The shape of the light-emitting region 010 refers to a two-dimensional shape. For example, the shape of the light-emitting region 010 can be the same as the shape of the first opening 210 of the pixel-defining pattern 200.

[0080] For example, as shown in FIG. 2 , the material of the pixel defining portion 230 may include polyimide, acryl, polyethylene terephthalate, or the like.

[0081] As shown in Figures 1 and 2, the defining structure 300 is located at least between two adjacent sub-pixels 10 of different colors. The defining structure 300 includes a first portion 310 covered by the pixel defining portion 230 and a second portion 320 exposed by the opening 201. The second portion 320 of the defining structure 300 is configured to isolate at least one layer of the light-emitting functional layer 130.

[0082] In some examples, as shown in Figures 1 and 2, the defining structure 300 is located between the pixel defining portion 230 and the base substrate 01, and the defining structure 300 is located at least between two adjacent sub-pixels 10 of different colors. The defining structure 300 includes a first portion 310 covered by the pixel defining portion 230 and a second portion 320 exposed by at least one of the first opening 210 and the second opening 220. The second portion 320 of the defining structure 300 is configured to isolate at least one layer of the light-emitting functional layer 130, such as isolating the charge generation layer in the light-emitting functional layer 130, such as isolating all film layers in the light-emitting functional layer.

[0083] For example, as shown in Figures 1 and 2, the orthographic projection of the first portion 310 of the defining structure 300 on the substrate 01 overlaps with the orthographic projection of the pixel defining portion 230 on the substrate 01, and the orthographic projection of the second portion 320 of the defining structure 300 on the substrate 01 does not overlap with the orthographic projection of the pixel defining portion 230 on the substrate 01. For example, the defining structure 300 includes two edges, one edge being the edge of the first portion 310 and the other edge being the edge of the second portion 320. The edge of the first portion 310 is covered by the pixel defining portion 230, and the edge of the second portion 320 is exposed by at least one of the first opening 210 and the second opening 220.

[0084] Figures 1 and 2 schematically illustrate that the second portion 320 of the defining structure 300 is exposed by the second opening 220 of the pixel defining pattern 200. For example, as shown in Figure 2 , in a direction parallel to the base substrate 01, a certain distance exists between the edge of the defining structure 300 exposed by the second opening 220 and the pixel defining portion 230, and this distance includes the separated film layer of the light-emitting functional layer 130.

[0085] As shown in FIG2 , the material of the defining structure 300 includes an organic material. The orthographic projection of the edge of the side of the second portion 320 of the defining structure 300 away from the base substrate 01 falls within the orthographic projection of the opening 201 on the base substrate 01 .

[0086] 2 , the angle α between the side surface of the second portion 320 of the defining structure 300 and the plane of the surface of the defining structure 300 close to the substrate 01 is greater than 20 degrees and less than 90 degrees.

[0087] The first part of the limiting structure using organic materials provided by the present disclosure is covered by the pixel limiting part, and the second part is exposed by at least one of the first opening and the second opening, while the positive projection of the edge of the side of the second part of the limiting structure away from the side of the substrate falls within the positive projection of the opening on the substrate. This can not only isolate at least one layer of the light-emitting functional layer between sub-pixels of different colors to reduce crosstalk, but also ensure the flatness of the electrode of the sub-pixel and the normal light output effect, while minimizing the impact of the limiting structure on the process and production capacity.

[0088] Compared to the significant impact of inorganic material definition structures on production capacity during the display substrate manufacturing process, the definition structures provided by the present disclosure using organic materials can be formed after the first electrode of the sub-pixel, or, if the definition structure and the first electrode of the sub-pixel do not overlap, before the first electrode is formed. Both of these aspects do not affect the flatness of the first electrode, minimizing the impact on the process and production capacity. For example, the pixel definition pattern is patterned after the first electrode and definition structure are formed.

[0089] For example, as shown in FIG2 , the angle α between the side surface of the second portion 320 of the defining structure 300 and the plane of the surface of the defining structure 300 on the side away from the base substrate 01 is greater than 20 degrees and less than 90 degrees. For example, the connection between the side surface of the second portion 320 of the defining structure 300 and the surface of the defining structure 300 on the side away from the base substrate 01 can be rounded, and the angle between the extended planes of the two surfaces can be α.

[0090] For example, as shown in FIG2 , the angle α may be 30 to 70 degrees. For example, the angle α may be 30 to 60 degrees. For example, the angle α may be 25 to 45 degrees. For example, the angle α may be 35 to 60 degrees. For example, the angle α may be 45 to 80 degrees. For example, the angle α may be 65 to 80 degrees. For example, the angle α may be 71 to 75 degrees.

[0091] For example, as shown in FIG. 1 and FIG. 2 , the material defining the structure 300 may be organic glue.

[0092] In some examples, as shown in Figures 1 and 2, the cross-section of the defining structure 300 taken along a plane parallel to the arrangement direction of two adjacent sub-pixels of different colors 10 and perpendicular to the base substrate 01 has a trapezoidal shape. For example, the plane may be a plane parallel to line AA' and perpendicular to the XY plane. For example, the plane may be a plane perpendicular to the extension direction of the defining structure 300.

[0093] In some examples, as shown in Figures 1 and 2, the length of the first base 301 of the trapezoid away from the substrate 01 is greater than the length of the second base 302 of the trapezoid close to the substrate 01; the angle between the first base 301 and the waist of the trapezoid is greater than 20 degrees and less than 90 degrees, and the lengths of the first base 301 and the second base 302 are both no greater than 10 microns.

[0094] By setting the limiting structure as a structure with a trapezoidal cross-section, it is advantageous to isolate at least one layer of the light-emitting functional layer, thereby preventing crosstalk between two adjacent sub-pixels of different colors.

[0095] For example, as shown in FIG2 , the lengths of the first bottom edge 301 and the second bottom edge 302 are both no greater than 10 microns. For example, the lengths of the first bottom edge 301 and the second bottom edge 302 are both greater than 1 micron. For example, the lengths of the first bottom edge 301 and the second bottom edge 302 are both greater than 2 microns. For example, the length of the first bottom edge 301 is greater than 5 microns. For example, the length of the second bottom edge 302 is less than 8 microns. For example, the lengths of the first bottom edge 301 and the second bottom edge 302 are both greater than 3 microns. In the disclosed embodiment, the first bottom edge 301 and the second bottom edge 302 can be any value between greater than 0 and less than 10 microns, and are not listed here one by one.

[0096] In some examples, as shown in FIG2 , the thickness of the defining structure 300 is no greater than 5 microns, and the edge of the second portion 320 of the defining structure 300 that is away from the surface of the side of the substrate 01 protrudes relative to the edge of the surface of the side of the substrate 01 that is close to the substrate, and the size of the protrusion is no greater than 5 microns.

[0097] For example, as shown in FIG2 , along the extension direction of line AA′, the surface of the second portion 320 of the defining structure 300 on the side away from the substrate 01 protrudes relative to the surface on the side close to the substrate 01, and the protrusion is no greater than 5 microns. For example, with the surface of the second portion 320 of the defining structure 300 on the side away from the substrate 01 being the upper surface, and the surface of the second portion 320 of the defining structure 300 on the side close to the substrate 01 being the lower surface, the protrusion of the edge of the upper surface relative to the edge of the lower surface can be 1 micron, 2 microns, 3 microns, or 4 microns. In the embodiments of the present disclosure, the protrusion of the edge of the upper surface relative to the edge of the lower surface can be any value between greater than 0 and less than 5 microns, and no further examples are given here.

[0098] In some examples, as shown in FIG2 , the angle between the side surface of the second portion 320 of the defining structure 300 and the plane of the first surface of the defining structure 300 on the side close to the substrate 01 (e.g., the surface on which the first bottom edge 301 of the cross section is located) is greater than 20 degrees and less than 90 degrees; the orthographic projection of the first surface on the substrate 01 falls within the orthographic projection of the second surface of the second portion 320 on the side away from the substrate 01 (e.g., the surface on which the second bottom edge 302 of the cross section is located) on the substrate 01, and the distance between the orthographic projection of the edge of the first surface and the orthographic projection of the edge of the second surface is no greater than 5 microns. For example, the distance between the orthographic projection of the edge of the first surface and the orthographic projection of the edge of the second surface is no greater than 4 microns, or no greater than 3 microns, or no greater than 2 microns, etc. The distance between the orthographic projection of the edge of the first surface and the orthographic projection of the edge of the second surface can be any value between greater than 0 and less than 5 microns, and no further examples are given here.

[0099] For example, as shown in FIG2 , the thickness of the defining structure 300 is greater than 1 micron. For example, the thickness of the defining structure 300 may be 1.5 to 2 microns. For example, the thickness of the defining structure 300 is not greater than 4.5 microns. For example, the thickness of the defining structure 300 is not greater than 4 microns. For example, the thickness of the defining structure 300 is not greater than 3.5 microns. For example, the thickness of the defining structure 300 is not greater than 3 microns. For example, the thickness of the defining structure 300 is not greater than 2.5 microns. The thickness of the defining structure 300 provided in the embodiment of the present disclosure may be any value greater than 0 and less than 5 microns, and will not be listed one by one here.

[0100] In some examples, as shown in FIG2 , the thickness of the defining structure 300 is greater than the thickness of the first electrode 110, and the thickness of at least a portion of the pixel defining portion 230 that does not overlap with the defining structure 300 in a direction perpendicular to the base substrate 01 is greater than the thickness of the defining structure 300. By configuring the thickness relationship between the defining structure 300, the first electrode 110, and the pixel defining portion 230, at least one layer of the light-emitting functional layer 130 of adjacent sub-pixels of different colors can be isolated to reduce crosstalk without affecting the normal light-emitting state of the sub-pixels.

[0101] For example, as shown in FIG2 , the distance between the surface of the pixel defining portion 230 at the overlapping position with the defining structure 300, which is away from the substrate 01, and the substrate 01 is H1. The distance between the surface of the pixel defining portion 230 at the non-overlapping position with the defining structure 300, which is away from the substrate 01, and the substrate 01 is H2 or H3. Both H2 and H3 are smaller than H1. For example, the difference between H1 and H2 is no greater than 5 microns. For example, the difference between H1 and H3 is no greater than 5 microns.

[0102] For example, as shown in FIG2 , the thickness of the pixel defining portion 230 at the intersection with the defining structure 300 can be 2 to 3 microns, such as 2.5 to 2.8 microns, or 2.735 microns. For example, the thickness of the pixel defining portion 230 can be 1.1 to 1.5 microns, such as 1.217 microns, and the thickness of the defining structure 300 can be 1.3 to 1.7 microns, such as 1.518 microns.

[0103] In some examples, as shown in Figures 1 and 2, the orthographic projection of the defining structure 300 on the base substrate 01 does not overlap with the orthographic projection of the first opening 210 on the base substrate 01, and the second opening 220 exposes the second portion 320 of the defining structure 300. For example, the defining structure 300 is exposed only by the second opening 220 of the pixel defining pattern 200, and the second portion 320 of the defining structure 300 exposed by the second opening 220 blocks at least one layer of the light-emitting functional layer 130, such as the charge generation layer, or the charge generation layer and all layers thereof facing the base substrate 01, such as all layers in the light-emitting functional layer 130. For example, the second electrode 120 is blocked at the edge of the defining structure 300 exposed by the second opening 220.

[0104] For example, as shown in FIG. 2 , the portion of the defining structure 300 not covered by the pixel defining portion 230 , such as the second portion 320 , has a size in the AA′ line extending direction of no more than 10 microns on the surface of the side away from the base substrate 01 .

[0105] In some examples, as shown in Figures 1 and 2, an insulating layer 03 is disposed between the first electrode 110 and the base substrate 01. The first electrode 110 and the confining structure 300 are both in contact with the insulating layer 03. The confining structure 300 is spaced apart from the first electrode 110, and the distance between the confining structure 300 and the first electrode 110 closest to it is no greater than 10 microns. The first electrode 110 closest to the confining structure 300 refers to the confining structure 300 and the first electrode 110 that are both covered by the pixel defining portion 230 located between the first opening 210 and the second opening 220. The distance between the confining structure 300 and the first electrode 110 closest to it refers to the distance between the bottom edge of the confining structure 300 on the side closest to the base substrate 01 and the first electrode 110. When spacing the confining structure 300 from the first electrode 110, the distance between the first electrode 110 and the confining structure 300 must be considered to ensure that the confining structure 300 does not affect the light extraction performance of the sub-pixel 10.

[0106] For example, as shown in FIG. 2 , the insulating layer 03 may be a flat layer.

[0107] For example, as shown in FIG2 , the distance between the defining structure 300 and the first electrode 110 is greater than 1 micron. For example, the distance between the defining structure 300 and the first electrode 110 is no greater than 9 microns. For example, the distance between the defining structure 300 and the first electrode 110 can be 2 to 8 microns. In the embodiments of the present disclosure, the distance between the defining structure 300 and the first electrode 110 can be any value between greater than 0 and less than 10 microns, and no further examples are given here.

[0108] For example, as shown in Figure 2, when the limiting structure 300 is spaced apart from the first electrode 110, the first electrode 110 can be patterned first, and then the limiting structure 300 can be patterned to prevent affecting the flatness of the first electrode 110; or the limiting structure 300 can be patterned first, and then the first electrode 110 can be patterned to ensure the outline of the first opening 210 of the pixel limiting pattern 200.

[0109] In some examples, as shown in Figures 1 and 2, the portion of the defining structure 300 located between two adjacent sub-pixels 10 of different colors includes at least one sub-definition structure 330. For example, the defining structure 300 includes multiple sub-definition structures 330, with at least one sub-definition structure 330 disposed between two adjacent sub-pixels 10 of different colors. The display substrate shown in Figure 1 schematically illustrates one sub-definition structure 330 disposed between two adjacent sub-pixels 10 of different colors.

[0110] In some examples, as shown in FIG. 1 , two adjacent sub-pixels 10 of different colors include a first sub-pixel 101 and a second sub-pixel 102 .

[0111] In some examples, as shown in FIG1 , the first color sub-pixel 101 includes a red sub-pixel or a green sub-pixel, and the second color sub-pixel 102 includes a blue sub-pixel. For example, FIG1 schematically illustrates that the first color sub-pixel 101 is a green sub-pixel, and the second color sub-pixel 102 is a blue sub-pixel. For example, the plurality of sub-pixels 10 further includes a third color sub-pixel 103, and the third color sub-pixel 103 is a red sub-pixel. The disclosed embodiments are not limited thereto, and the colors of the first color sub-pixel 101, the second color sub-pixel 102, and the third color sub-pixel 103 can be interchanged.

[0112] For example, as shown in FIG1 , the area of ​​the light-emitting region 010 of a blue sub-pixel is larger than that of the light-emitting region 010 of a red sub-pixel, and the area of ​​the light-emitting region 010 of a red sub-pixel is larger than that of the light-emitting region 010 of a green sub-pixel.

[0113] For example, as shown in FIG1 , the sub-pixel 10 includes a first pixel group and a second pixel group alternately arranged in the Y direction. The first pixel group and the second pixel group are staggered in the X direction. The first pixel group includes red sub-pixels and blue sub-pixels alternately arranged in the X direction, and the second pixel group includes green sub-pixels arranged in the X direction. For example, one red sub-pixel is surrounded by four green sub-pixels, and one blue sub-pixel is surrounded by four green sub-pixels.

[0114] In some examples, as shown in FIG1 , at least one sub-defining structure 330 includes a ring-shaped sub-defining structure 330 surrounding the light-emitting region 010 of at least one sub-pixel 10. For example, the light-emitting regions 010 of sub-pixels 10 of the same color are surrounded by the ring-shaped sub-defining structure 330 to improve the uniformity of the height of the pixel-defining portion 230 around the light-emitting region 010.

[0115] For example, as shown in FIG1 , the light-emitting area 010 of the third color sub-pixel 103 is surrounded by the annular sub-defining structure 330. For example, the light-emitting area 010 of the red sub-pixel is surrounded by the annular sub-defining structure 330. Of course, the present disclosure is not limited thereto. For example, the light-emitting area 010 of the green sub-pixel is surrounded by the annular sub-defining structure 330.

[0116] For example, as shown in FIG1 , the orthographic projection of the annular sub-defining structure 330 on the substrate 01 overlaps with the orthographic projection of the first electrode 110 of the third color sub-pixel 103 on the substrate 01. For example, the annular sub-defining structure 330 is located between the first color sub-pixel 101 and the third color sub-pixel 103, and the orthographic projection of the annular sub-defining structure 330 on the substrate 01 overlaps with the orthographic projection of the first electrode 110 of the first color sub-pixel 101 on the substrate 01.

[0117] For example, as shown in FIG1 , a stripe-shaped sub-defining structure 330 is disposed between the first color sub-pixel 101 and the third color sub-pixel 103. For example, the light-emitting region 010 of the first color sub-pixel 101 is in the shape of a quadrilateral, e.g., comprising two parallel long sides and two parallel short sides, the two long sides and the two short sides being connected end to end. For example, the stripe-shaped sub-defining structure 330 is located on one side of the long side of the light-emitting region 010 of the first color sub-pixel 101, e.g., the stripe-shaped sub-defining structure 330 is disposed parallel to the long side of the light-emitting region 010 of the first color sub-pixel 101.

[0118] For example, as shown in Figure 1, along the extension direction of the long side of the light-emitting area 010 of the first color sub-pixel 101, the length of the strip sub-defining structure 330 is greater than the length of the long side, so as to provide the possibility of better isolating at least one layer of the light-emitting functional layer 130 between the first color sub-pixel 101 and the second color sub-pixel 102.

[0119] In some examples, as shown in FIG1 , at least one second opening 220 is in the shape of an elongated strip, and at least one second opening 220 is located between two adjacent sub-pixels 10 of different colors, with the long side of the elongated strip being perpendicular to the arrangement direction of the two adjacent sub-pixels 10 of different colors. For example, each second opening 220 is in the shape of an elongated strip.

[0120] For example, as shown in Figure 1, the second opening 220 having a long strip shape is parallel to the strip sub-defining structure 330, and the length of the second opening 220 is not greater than the length of the strip sub-defining structure 330. Therefore, the length of the second opening 220 determines the size of at least one layer used to isolate the light-emitting functional layer, thereby determining the degree of crosstalk between two adjacent sub-pixels 10 of different colors.

[0121] For example, as shown in FIG1 , the length of the second openings 220 on both sides of the long sides of the light-emitting area 010 of the first color sub-pixel 101 is the same as the length of the exposed strip-shaped sub-defining structures 330. In this case, it is necessary to control the uniformity of the second openings and the sub-defining structures at different locations in the pixel-defining pattern to ensure a uniform isolation effect for at least one layer of the light-emitting functional layer.

[0122] In some examples, as shown in FIG1 , the long side of the elongated second opening 220 is parallel to the side of the first opening 210 closest to it. For example, the first opening 210 closest to the long side of the elongated second opening 220 is the first opening 210 that exposes the first electrode 110 of the first color sub-pixel 101 or the second color sub-pixel 102, and the long side of the elongated second opening 220 is parallel to the side of the first opening 210. For example, the adjacent sides of the light-emitting areas 010 of the first color sub-pixel 101 and the adjacent second color sub-pixel 102 are arranged in parallel, and the long side of the second opening 220 located between the adjacent first color sub-pixel 101 and the second color sub-pixel 102 is parallel to the sides of the light-emitting areas 010 of the two color sub-pixels.

[0123] For example, as shown in Figure 1, the orthographic projection of the strip sub-defining structure 330 located between the first color sub-pixel 101 and the second color sub-pixel 102 on the substrate 01 overlaps with the orthographic projection of the first electrode 110 of at least one of the first color sub-pixel 101 and the second color sub-pixel 102 on the substrate 01.

[0124] For example, as shown in Figure 1, the number of second openings 220 used to expose the annular sub-defining structure 330 surrounding the same third color sub-pixel 103 is four, each second opening 220 is in the shape of a long strip, and the long sides of the four second openings 220 are respectively parallel to the four sides of the quadrilateral light-emitting area 010 of the third color sub-pixel 103.

[0125] 1 , the lengths of the long sides of the four second openings 220 surrounding the third color sub-pixel 103 are all greater than the side lengths of the light-emitting area 010 of the third color sub-pixel 103. For example, the four second openings 220 surrounding the third color sub-pixel 103 are all located between the third color sub-pixel 103 and the first color sub-pixel 101.

[0126] FIG3 is a partial enlarged view of the display substrate shown in FIG1 .

[0127] For example, as shown in Figures 1 and 3, the distances between the four sides of the light-emitting area 010 of the third color sub-pixel 103 and the edge of the annular sub-defining structure 330 exposed by the second opening 220 are a, b, c, and d, respectively. For example, the value ranges of a, b, c, and d include: 0≤a≤20μm, 0≤b≤20μm, 0≤c≤20μm, and 0≤d≤20μm. For example, a, b, c, and d can all be equal, or at least one can be different from the other three. For example, the distances between the above-mentioned annular sub-defining structure 330 and the light-emitting areas 010 of the four first color sub-pixels 101 surrounding it are a', b', c', and d', respectively. For example, the value ranges of a', b', c', and d' include: 0≤a'≤20μm, 0≤b'≤20μm, 0≤c'≤20μm, and 0≤d'≤20μm. For example, a', b', c', and d' can all be equal, or at least one can be unequal to the other three, such as a'=c'≠b'=d', or a'≠b'≠c'≠d'. For example, the first color sub-pixel 101 is provided with a long strip-shaped sub-defining structure 330 only on one side of the long side of its light-emitting area 010. The distances between the long side of the light-emitting area 010 of the first color sub-pixel 101 and the two adjacent long strip-shaped sub-defining structures 330 are e and f, respectively. For example, the value ranges of e and f include: 0≤e≤20μm, 0≤f≤20μm. For example, e and f can be equal or unequal. For example, the second opening 220 can be a groove located between the sub-pixels 10 in the pixel defining pattern 200. The width of the defining structure 300 needs to take into account the width of the second opening 220, and the width of the second opening 220 needs to take into account the distance between the light-emitting areas 010 of adjacent sub-pixels 10. The width of the second opening 220 is g, and the value range of g includes: 0≤g≤20μm. For example, the width of the second opening 220 at different positions can be equal. For example, the width of the sub-defining structure 330 can be h, and the value range of h includes: 0≤h≤5μm. For example, the overlapping width of the second opening 220 and the sub-defining structure 330 needs to take into account the partition effect of the material of the light-emitting functional layer 130, such as the overlapping width is between 0 and h.

[0128] In some examples, as shown in FIG1 , at least one sub-defining structure 330 includes a sub-defining structure 330, wherein an edge of a first portion 310 of the sub-defining structure 330 is closer to an edge of the light-emitting region 010 of the first color sub-pixel 101. For example, a sub-defining structure 330 is disposed between the first color sub-pixel 101 and the second color sub-pixel 102, and a distance between the sub-defining structure 330 and the light-emitting region 010 of the first color sub-pixel 101 is smaller than a distance between the sub-defining structure 330 and the light-emitting region 010 of the second color sub-pixel 102.

[0129] For example, as shown in FIG. 1 , a sub-definition structure 330 is disposed between the first color sub-pixel 101 and the third color sub-pixel 103 , and the sub-definition structure 330 is closer to the third color sub-pixel 103 .

[0130] For example, as shown in FIG1 , only the edge of the second portion 320 of the confining structure 300 serves to block the light-emitting functional layer 130. Positioning this edge closer to the red sub-pixel maximizes the blocking effect on the red sub-pixel, but this is not limited to the embodiment of the present invention; this edge can also be positioned closer to the green sub-pixel. For example, FIG1 schematically illustrates that the portion of the confining structure 300's edge serving to block the light-emitting functional layer 130, located between the blue and green sub-pixels, is closer to the green sub-pixel, but this is not limited to the embodiment of the present invention; this edge can also be positioned closer to the blue sub-pixel. For example, the annular sub-confining structure 330 surrounding the red sub-pixel can also be configured to have a strip-shaped sub-confining structure 330 located on either side of the green sub-pixel. For example, the strip-shaped sub-confining structures 330 located on either side of the green sub-pixel can also be configured as annular sub-confining structures 330. For example, the second opening 220 cannot be configured as a closed ring structure surrounding any one light-emitting area 010. For example, the number of second openings 220 surrounding any light-emitting area 010 can be multiple, spaced apart, and the size of the second openings 220 depends on the process.

[0131] In some examples, as shown in FIG1 , two sub-defining structures 330 are disposed on opposite sides of a sub-pixel 10, each closest to the other. One of the two sub-defining structures 330 is rotationally symmetric with respect to the center of the light-emitting area 010 of the sub-pixel 10. For example, the two sub-defining structures 330 on either side of the long side of the light-emitting area 010 of the first color sub-pixel 101 can be symmetrically arranged relative to the centerline of the light-emitting area 010 extending along the long side, thereby enhancing the symmetry of the pixel-defining portion 230. For example, one of the two sub-defining structures 330 can be rotated 180 degrees around the center of the light-emitting area 010 to coincide with the other sub-defining structure 330. This symmetrical design can achieve a more symmetrical barrier effect in a specific direction. Furthermore, when these symmetrically arranged sub-defining structures serve to support the mask, they can improve the uniformity of the support force applied to the evaporation mask.

[0132] For example, FIG2 only illustrates the confinement structure 300 located on one side of the first color sub-pixel 101. For example, the confinement structure 300 may be provided on both sides of the first color sub-pixel 101. For example, the sub-confinement structures 330 located on both sides of the same sub-pixel 10 each have one edge covered by the pixel-defining portion 230 and the other edge exposed by the second opening 220. For example, the confinement structures 300 located on both sides of the same sub-pixel 10 may be symmetrically distributed relative to the center line of the light-emitting area 010 of the sub-pixel 10. For example, the second openings 220 located on both sides of the same sub-pixel 10 may be symmetrically distributed relative to the center of the light-emitting area 010 of the sub-pixel 10.

[0133] For example, as shown in FIG1 , the edge of the defining structure 300 is closer to the first color sub-pixel 101, such as the light-emitting region 010 of the green sub-pixel, than the edge of the second opening 220. For example, the first portion 310 of the defining structure 300 is closer to the light-emitting region 010 of the first color sub-pixel 101 than the second portion 320 of the defining structure 300. For example, the edge of the defining structure 300 is closer to the third color sub-pixel 103, such as the light-emitting region 010 of the red sub-pixel, than the edge of the second opening 220. For example, the first portion 310 of the defining structure 300 is closer to the light-emitting region 010 of the third color sub-pixel 103 than the second portion 320 of the defining structure 300.

[0134] For example, as shown in Figure 1, the edge of the defining structure 300 is farther away from the second color sub-pixel 102, such as the light-emitting area 010 of the blue sub-pixel, than the edge of the second opening 220, such as the second portion 320 of the defining structure 300 is closer to the light-emitting area 010 of the second color sub-pixel 102 than the first portion 310 of the defining structure 300.

[0135] The data writing voltages of sub-pixels of different colors are different, resulting in low grayscales caused by the blue and green sub-pixels being susceptible to current leakage from the red sub-pixels when displaying images at low grayscales, such as crosstalk from the red sub-pixels to the blue or green sub-pixels. Therefore, the display substrate provided in this example can increase the channel ratio of the second electrode around the light-emitting area of ​​the blue sub-pixel by setting the limiting structure farther away from the blue sub-pixel, thereby improving the continuity of the second electrode, preventing an increase in cross-voltage, and improving display uniformity.

[0136] Figure 4 is a schematic diagram of a partial planar structure of a display substrate according to another example of an embodiment of the present disclosure. The display substrate shown in Figure 4 differs from the display substrate shown in Figure 1 in that the relative positions of the defining structure 300, the second opening 220, and the light-emitting regions 010 of the different color sub-pixels 10 are different.

[0137] For example, as shown in FIG4 , the edge of the second opening 220 is closer to the light-emitting area 010 of the first color sub-pixel 101 than the edge of the defining structure 300, e.g., the second portion 320 of the defining structure 300 is closer to the light-emitting area 010 of the first color sub-pixel 101 than the first portion 310. For example, the edge of the second opening 220 is closer to the light-emitting area 010 of the third color sub-pixel 103 than the edge of the defining structure 300, e.g., the second portion 320 of the defining structure 300 is closer to the light-emitting area 010 of the third color sub-pixel 103 than the first portion 310.

[0138] For example, as shown in Figure 4, the limiting structure 300 located between the first color sub-pixel 101 and the third color sub-pixel 103 is closer to the light-emitting area 010 of the third color sub-pixel 103, so as to maximize the isolation effect of at least one layer of the light-emitting functional layer 130 of the third color sub-pixel 103, thereby achieving the purpose of preventing crosstalk.

[0139] Except for the positional relationship between the defining structure, the second opening, and the light-emitting areas in the display substrate shown in FIG4 , which is different from the positional relationship between the defining structure, the second opening, and the light-emitting areas shown in FIG1 , the other structures in the display substrate shown in FIG4 may have the same features as the other structures in the display substrate shown in FIG1 , and are not further described here. The shape of the defining structure in the display substrate shown in FIG4 may be the same as the shape of the defining structure in the display substrate shown in FIG1 , the shape of the second opening shown in FIG4 may be the same as the shape of the second opening in the display substrate shown in FIG1 , and the shape and distribution of the light-emitting areas shown in FIG4 may be the same as the shape and distribution of the light-emitting areas in the display substrate shown in FIG1 .

[0140] Figure 5 is a schematic diagram of a partial cross-sectional structure of a display substrate provided according to another example of an embodiment of the present disclosure. Figure 5 may be a schematic diagram of a partial cross-sectional structure taken along line BB' of the display substrate.

[0141] The difference between the display substrate shown in FIG. 5 and the display substrate shown in FIG. 1 to FIG. 3 is that the limiting structure 300 is provided on only one side of the sub-pixel 10 of the same color.

[0142] For example, as shown in Figure 5, the limiting structure 300 is only located on one side of the first opening 210 of the pixel limiting pattern 200, and the second opening 220 is only provided at the position of the limiting structure 300. For example, the limiting structure 300 can be located on one side of a specific color sub-pixel 10, such as a red sub-pixel, a green sub-pixel, or a blue sub-pixel. For example, the limiting structure 300 can be located between two specific color sub-pixels 10, such as between a green sub-pixel and a blue sub-pixel, or between a green sub-pixel and a red sub-pixel. For example, the limiting structure 300 can be provided corresponding to three color sub-pixels 10. For example, the limiting structure 300 can include a plurality of sub-limiting structures 330, and the plurality of sub-limiting structures 330 can be evenly provided or provided at a specific position in the display area. The embodiment of the present disclosure does not limit the position of the limiting structure, and it can be provided according to product requirements.

[0143] In the example of the display substrate shown in FIG5 , except for the position of the defining structure 300, which differs from the position of the defining structure 300 in the display substrate shown in FIG1 to FIG3 , the other structures in the display substrate shown in FIG5 may have the same features as the corresponding structures in the display substrate shown in FIG1 to FIG3 , and detailed description thereof is omitted. For example, the cross-section of the defining structure 300 in the display substrate shown in FIG5 may have the same features as the cross-section of the defining structure 300 in the display substrate shown in FIG1 to FIG3 , and detailed description thereof is omitted.

[0144] Figures 6 and 7 are schematic diagrams of partial cross-sectional structures of display substrates provided according to different examples of the present disclosure. Figures 6 and 7 may be schematic diagrams of partial cross-sectional structures taken along line BB' of the display substrate.

[0145] The display substrate shown in FIG. 6 differs from the display substrate shown in FIG. 1 to FIG. 3 in that the relative positional relationship between the defining structure 300 and the pixel defining pattern 200 is different, and the relative positional relationship between the defining structure 300 and the first electrode 110 is different.

[0146] In some examples, as shown in FIG6 , the defining structure 300 covers the edge of the first electrode 110. Covering the edge of the first electrode 110 with the defining structure 300 helps prevent the edge of the first electrode 110 from being exposed due to the thinness of the edge of the pixel defining portion 230 and failing to cover the first electrode 110, thereby preventing display defects.

[0147] In some examples, as shown in FIG6 , along the arrangement direction of two adjacent sub-pixels 10 of different colors, the dimension of the confining structure 300 covering the first electrode 110 is no greater than 5 microns. For example, along the extension direction of line BB' shown in the figure, the dimension of the confining structure 300 covering the first electrode 110 is no greater than 5 microns. For example, along the extension direction of line BB' shown in the figure, the dimension of the confining structure 300 covering the first electrode 110 is greater than 0. For example, along the extension direction of line BB' shown in the figure, the dimension of the confining structure 300 covering the first electrode 110 can be 1 micron, or 2 microns, or 3 microns, etc. The dimension of the confining structure 300 covering the first electrode 110 can be any value greater than 0 and less than 5 microns, and these values ​​are not enumerated here.

[0148] For example, as shown in FIG. 6 , the size of the first electrode 110 covered by the defining structure 300 may be a size perpendicular to the extending direction of the defining structure 300 .

[0149] In some examples, as shown in FIG6 , the second portion 320 of the defining structure 300 is at least exposed by the first opening 210. For example, the orthographic projection of the second portion 320 of the defining structure 300 on the substrate 01 is smaller than the orthographic projection of the first portion 310 of the defining structure 300 on the substrate 01. For example, the defining structure 300 only covers a portion of the edge of a single first electrode 110, such that at least a portion of the film layer within the first opening 210 is a continuous structure. The portion of the defining structure 300 exposed by the first opening 210 and the first opening 210 together define the light-emitting area 010 of the sub-pixel 10.

[0150] For example, as shown in FIG6 , the openings 201 included in the pixel defining pattern 200 in the display substrate are all first openings 210. At some locations of the first openings 210, the light-emitting functional layer 130 is continuously provided, while at other locations, at least one layer of the light-emitting functional layer 130 is disconnected. For example, the display substrate shown in FIG6 may not include the second opening 220 in the example shown in FIG1 .

[0151] Figure 6 schematically shows that the first electrode 110 is provided with a limiting structure 300 covering the edge of the first electrode 110 on both sides of the BB' line extension direction, but is not limited to this. The first electrode 110 can also be configured so that one side edge of the first electrode 110 is covered by the limiting structure 300 and the other side edge of the first electrode 110 is covered by the pixel defining portion 230.

[0152] For example, as shown in FIG. 6 , along a direction perpendicular to the base substrate 01 , the first portion 310 of the defining structure 300 does not overlap with the first electrode 110 , and the second portion 320 of the defining structure 300 overlaps with the first electrode 110 .

[0153] For example, as shown in FIG6 , the edges of the first electrode 110 of one color sub-pixel 10 may be covered by the defining structure 300, while the edges of the first electrodes 110 of the other color sub-pixels 10 may be covered by the pixel defining portion 230. For example, of two adjacent sub-pixels 10 of different colors, only the first electrode 110 of one sub-pixel 10 may be covered by the defining structure 300, while the first electrode 110 of the other sub-pixel 10 may be covered by the pixel defining portion 230.

[0154] Of course, the embodiments of the present disclosure are not limited to this. The limiting structure 300 shown in Figures 1 to 4 can also be combined with the limiting structure 300 shown in Figure 6, such that the edge of the first electrode 110 at some positions is covered by the limiting structure 300, and the first electrode 110 at some positions is spaced apart from the limiting structure 300.

[0155] In the example of the display substrate shown in FIG6 , except for the position of the defining structure 300 and the pixel defining pattern 200, which differ from the position of the defining structure 300 and the pixel defining pattern 200 in the display substrate shown in FIG1 to FIG3 , the other structures in the display substrate shown in FIG6 may have the same features as the corresponding structures in the display substrate shown in FIG1 to FIG3 , and further description thereof is omitted. For example, the cross-section of the defining structure 300 in the display substrate shown in FIG6 may have the same features as the cross-section of the defining structure 300 in the display substrate shown in FIG1 to FIG3 , and further description thereof is omitted.

[0156] As shown in Figure 7, two sub-definition structures 330 can be set between two adjacent sub-pixels in the display substrate, and one of the two sub-definition structures 330 covers the edge of the first electrode 110 and is exposed by the first opening 210, similar to the sub-definition structure 330 covering the edge of the first electrode 110 and exposed by the first opening 210 shown in Figure 6.

[0157] In some examples, as shown in FIG7 , the at least one sub-defining structure 330 located between two adjacent sub-pixels includes two spaced-apart sub-defining structures 330, with the second portion 320 of one of the two sub-defining structures 330 exposed by the first opening 210, and the second portion 320 of the other of the two sub-defining structures 330 exposed by the second opening 220. By providing two sub-defining structures 330 between two adjacent sub-pixels, one of the two sub-defining structures 330 is exposed by the first opening 210 while covering the edge of the first electrode 110, while the other of the two sub-defining structures 330 is exposed by the second opening 220. This not only further improves the isolation effect of the light-emitting functional layer 130 and reduces crosstalk, but also reduces the risk of corrosion caused by the exposed edge of the first electrode 110. Of course, the embodiments of the present disclosure are not limited to this. For example, one of the two sub-defining structures 330 may only cover the edge of the first electrode 110 without being exposed by the first opening 210, while the other of the two sub-defining structures 330 is exposed by the second opening 220.

[0158] FIG8 is a schematic diagram of a partial planar structure of a display substrate provided according to another example of an embodiment of the present disclosure. FIG9 is a schematic diagram of a partial cross-sectional structure taken along line CC' in FIG8 . The display substrate shown in FIG8 differs from the display substrate shown in FIG1 in the width of the defining structure 300 and the positional relationship between the defining structure 300 and the first electrode 110. The display substrate shown in FIG9 differs from the display substrate shown in FIG6 in the opening 201 exposing the defining structure 300.

[0159] For example, as shown in Figures 8 and 9, the defining structure 300 covers the edge of the first electrode 110, and the portion of the edge of the first electrode 110 covered by the defining structure 300 is the first portion 310 of the defining structure 300. For example, the first electrode 110 includes a portion exposed by the first opening 210, a portion covered by the pixel defining portion 230, and a portion covered by the defining structure 300. By having the defining structure 300 cover the edge of the first electrode 110, it is helpful to prevent the edge of the first electrode 110 from being too thin at the edge of the pixel defining portion 230 and failing to cover the first electrode 110, thereby preventing the edge of the first electrode 110 from being exposed and causing display defects.

[0160] For example, as shown in FIG. 8 and FIG. 9 , the second portion 320 of the defining structure 300 is exposed only by the second opening 220 , but not by the first opening 210 .

[0161] In the display substrates shown in the examples of Figures 8 and 9 , except for the position of the defining structure 300, which differs from the positional relationship between the defining structure 300 and the first electrode 110 in the display substrates shown in Figures 1 to 3 , the other structures in the display substrates shown in Figures 8 and 9 may have the same features as the corresponding structures in the display substrates shown in Figures 1 to 3 , and detailed description thereof is omitted. For example, the cross-section of the defining structure 300 in the display substrates shown in Figures 8 and 9 may have the same features as the cross-section of the defining structure 300 in the display substrates shown in Figures 1 to 3 , and detailed description thereof is omitted.

[0162] FIG10 is a schematic diagram of a partial cross-sectional structure of a display substrate according to another example of an embodiment of the present disclosure. The display substrate shown in FIG10 differs from the display substrate shown in FIG9 in the positional relationship between the defining structure 300 and the first opening 210.

[0163] In some examples, as shown in FIG10 , at least one sub-definition structure 330 located between two sub-pixels 10 includes a sub-definition structure 330 having one side edge exposed by the first opening 210 and another side edge exposed by the second opening 220. By exposing both side edges of the sub-definition structure 330 by the first opening 210 and the second opening 220, respectively, while the sub-definition structure 330 covers the edge of the first electrode 110, this not only helps further improve the isolation effect of the light-emitting functional layer 130 and further reduces crosstalk, but also reduces the risk of corrosion caused by the exposed edge of the first electrode 110.

[0164] For example, as shown in FIG10 , the sub-defining structure 330 includes two second portions 320 and a first portion 310 located between the two second portions 320. The two second portions 320 are exposed by the first opening 210 and the second opening 220, respectively. For example, the area of ​​the orthographic projection of the second portion 320 exposed by the first opening 210 on the base substrate 01 is not greater than the area of ​​the orthographic projection of the second portion 320 exposed by the second opening 220 on the base substrate 01.

[0165] In the example of the display substrate shown in FIG10 , except that the positional relationship between the defining structure 300, the pixel defining pattern 200, and the first electrode 110 is different from the positional relationship between the defining structure 300, the pixel defining pattern 200, and the first electrode 110 in the display substrate shown in FIG1 to FIG3 , the other structures in the display substrate shown in FIG10 may have the same features as the corresponding structures in the display substrate shown in FIG1 to FIG3 , and no further description is given here. For example, the cross-section of the defining structure 300 in the display substrate shown in FIG10 may have the same features as the cross-section of the defining structure 300 in the display substrate shown in FIG1 to FIG3 , and no further description is given here.

[0166] Figure 11 is a schematic diagram of a partial planar structure of a display substrate provided according to another example embodiment of the present disclosure. Figure 12 is a schematic diagram of a partial cross-sectional structure taken along line DD' in Figure 11. The display substrate shown in Figure 11 differs from the display substrate shown in Figure 1 in that the shape of the confinement structure 300 surrounding the first color sub-pixel 101 is different, and the positional relationship between the confinement structure 300 surrounding the first color sub-pixel 101 and the second opening 220 is different.

[0167] For example, as shown in Figures 11 and 12, one sub-definition structure 330 is provided between adjacent first-color sub-pixels 101 and second-color sub-pixels 102, and two sub-definition structures 330 are provided between adjacent first-color sub-pixels 101 and third-color sub-pixels 103. By providing different numbers of sub-definition structures 330 between sub-pixels of different colors, it is possible to reduce crosstalk between the first-color sub-pixel 101 and the third-color sub-pixel 103, where crosstalk is likely to occur, while also increasing the size of the communication channel with the second electrode 120 around the second-color sub-pixel 102 and improving the continuity of the second electrode 120. Of course, the embodiments of the present disclosure are not limited to this, and two sub-definition structures 330 may also be provided between the first-color sub-pixel 101 and the second-color sub-pixel 102.

[0168] In some examples, as shown in Figures 11 and 12 , the at least one sub-definition structure 330 located between two adjacent sub-pixels includes two spaced-apart sub-definition structures 330, with opposing edges of the two sub-definition structures 330 exposed by the same second opening 220, further improving the isolation effect of the light-emitting functional layer 130 of the two adjacent sub-pixels 10. For example, the two second portions 320 in the two sub-definition structures 330 are close to each other.

[0169] In some examples, as shown in Figures 11 and 12 , the two sub-defining structures 330 are respectively two annular sub-defining structures 330 surrounding the light-emitting areas 010 of two adjacent sub-pixels of different colors. For example, the light-emitting areas 010 of the first color sub-pixel 101 and the light-emitting areas 010 of the third color sub-pixel 103 are each surrounded by two annular sub-defining structures 330, and the adjacent edges of the two annular sub-defining structures 330 are exposed by the same second opening 220. For example, there are multiple second openings 220 that expose each annular sub-defining structure 330, and the multiple second openings 220 are spaced apart from each other.

[0170] By arranging the light-emitting areas of two adjacent sub-pixels to be surrounded by the annular sub-defining structure, the uniformity of the heights of the pixel defining portions around the light-emitting areas of the two adjacent sub-pixels is improved.

[0171] Figure 11 schematically shows that the light-emitting area 010 of the first color sub-pixel 101 and the light-emitting area 010 of the third color sub-pixel 103 are both surrounded by the annular sub-defining structure 330, but is not limited to this. For example, the light-emitting area 010 of the first color sub-pixel 101 and the light-emitting area 010 of the second color sub-pixel 102 are both surrounded by the annular sub-defining structure 330, such as the light-emitting area 010 of the second color sub-pixel 102 and the light-emitting area 010 of the third color sub-pixel 103 are both surrounded by the annular sub-defining structure 330, such as the light-emitting area 010 of the first color sub-pixel 101, the light-emitting area 010 of the second color sub-pixel 102 and the light-emitting area 010 of the third color sub-pixel 103 are all surrounded by the annular sub-defining structure 330.

[0172] In the display substrates shown in the examples of Figures 11 and 12, except for the different shape of the defining structure 300 surrounding the first color sub-pixel 101 and the different positional relationship between the defining structure 300 surrounding the first color sub-pixel 101 and the second opening 220 compared to the shape of the defining structure 300 surrounding the first color sub-pixel 101 and the different positional relationship between the defining structure 300 surrounding the first color sub-pixel 101 and the second opening 220, the other structures in the display substrates shown in Figures 11 and 12 can have the same features as the corresponding structures in the display substrates shown in Figures 1 to 3, and no further description is given here. For example, the cross-section of the defining structure 300 in the display substrate shown in Figure 10 can have the same features as the cross-section of the defining structure 300 in the display substrate shown in Figures 1 to 3, and no further description is given here.

[0173] It should be noted that the display substrate in the examples shown in Figures 1 to 11 schematically shows a situation where the limiting structure and the second opening overlap with the first electrode of the sub-pixel, but the schematic diagram does not limit the overlapping relationship between the limiting structure and the second opening and the first electrode. At least one of the limiting structure and the second opening in the display substrate in the examples shown in Figures 1 to 11 may also not overlap with any first electrode.

[0174] Figures 13 and 14 are schematic diagrams of partial planar structures of display substrates provided according to different examples of the present disclosure. Figure 15 is a schematic diagram of a partial cross-sectional structure taken along line EE' shown in Figure 13. Figure 16 is a schematic diagram of a partial cross-sectional structure taken along line FF' shown in Figure 14.

[0175] 13 and 14 differ from the display substrate shown in FIG1 to FIG3 in that the shape and position of the defining structure 300 and the second opening 220 are different. FIG13 and FIG14 also show spacers 400.

[0176] In some examples, as shown in Figures 13 to 16 , the display substrate further includes a spacer 400 located on a side of the pixel defining portion 230 away from the base substrate 01 , and the defining structure 300 is made of a material different from that of the spacer 400. For example, the spacer 400 (PS) is configured to support a fine metal mask (FMM Mask) when fabricating the light-emitting layer.

[0177] For example, as shown in Figures 13 to 16 , the material of the defining structure 300 may include a negative photoresist, and the material of the spacer 400 may include a positive photoresist. For example, a positive photoresist is one in which the illuminated portion undergoes a degradation reaction and is dissolved by a developer, leaving the unexposed portion with a pattern that is consistent with the pattern on the mask. A negative photoresist is one in which the illuminated portion undergoes a cross-linking reaction and becomes insoluble, while the unexposed portion is dissolved by a developer, resulting in a pattern that is complementary to the pattern on the mask.

[0178] In some examples, as shown in Figures 13 to 16, the thickness of the spacer 400 is no greater than 5 microns, and the thickness of the pixel defining portion 230 is no greater than 5 microns. For example, the thickness of the spacer 400 is no greater than 4 microns, and the thickness of the pixel defining portion 230 is no greater than 4 microns. For example, the thickness of the pixel defining portion 230 is greater than 1 micron. For example, the thickness of the spacer 400 is greater than 1 micron. For example, along a direction perpendicular to the base substrate 01, the thickness of the portion where the pixel defining portion 230 overlaps with the defining structure 300 can be less than the thickness of the defining structure 300. For example, along a direction perpendicular to the base substrate 01, the thickness of the portion where the pixel defining portion 230 overlaps with the defining structure 300 can be 1.1 to 1.3 microns, and the thickness of the defining structure 300 can be 1.4 to 1.6 microns.

[0179] 13 and 15 , the spacers 400 do not overlap with the defining structure 300 in a direction perpendicular to the base substrate 01. For example, the thickness of the spacers 400 may be greater than that of the defining structure 300 to enable the spacers 400 to support the mask.

[0180] In some examples, as shown in Figures 14 and 16 , the orthographic projection of the spacer 400 on the base substrate 01 overlaps with the orthographic projection of the defining structure 300 on the base substrate 01. For example, the orthographic projection of the spacer 400 on the base substrate 01 completely falls within the orthographic projection of the defining structure 300 on the base substrate 01. Thus, the structure formed by the spacer 400 and the defining structure 300 is used to support the mask, which is beneficial for improving the support effect.

[0181] In some examples, as shown in Figures 14 and 16, the defining structure 300 includes a plurality of defining portions 340 and a connecting portion 350 that connects at least part of the plurality of defining portions 340. In a direction perpendicular to the base substrate 01, the defining portion 340 overlaps with the second opening 220, and the orthographic projection of the connecting portion 350 on the base substrate 01 completely falls within the orthographic projection of the pixel defining portion 230 on the base substrate 01; the orthographic projection of the spacer 400 on the base substrate 01 completely falls within the orthographic projection of the connecting portion 350 on the base substrate 01.

[0182] For example, as shown in FIG14 , the defining portion 340 is located between adjacent first color sub-pixels 101 and second color sub-pixels 102, or between adjacent first color sub-pixels 101 and third color sub-pixels 103, and the second portion 320 of the defining portion 340 is exposed by the second opening 220. For example, the connecting portion 350 can be located between four defining portions 340 and connect the four defining portions 340. For example, the defining portions 340 and the connecting portion 350 can be an integrated structure. By configuring the defining structure to include mutually connected defining portions and connecting portions, the density of the defining structure can be increased to increase line width uniformity, and the symmetry of the defining structure can also be improved.

[0183] For example, as shown in Figures 14 and 16, the total height of the stacked defining structure 300, pixel defining portion 230, and spacer 400 is no greater than 10 microns. For example, the total height of the stacked defining structure 300, pixel defining portion 230, and spacer 400 is no greater than 9 microns, or no greater than 7 microns, or no greater than 5 microns, etc.

[0184] For example, as shown in FIG. 14 , in a direction perpendicular to the base substrate 01 , the size of the connection portion 350 overlapping the spacer 400 in the Y direction is larger than the size of the connection portion 350 not overlapping the spacer 400 in the Y direction.

[0185] For example, as shown in FIG14 , the defining structure 300 composed of four defining portions 340 and one connecting portion 350 may be a profiled defining structure 300. The defining structure 300 surrounding the first color sub-pixel 101 may include two profiled defining structures 300 spaced apart from each other, and the defining structure 300 surrounding the third color sub-pixel 103 may include two profiled defining structures 300 spaced apart from each other. For example, the profiled defining structure 300 may be curved toward the light-emitting region 010 of the first color sub-pixel 101. For example, the profiled defining structure 300 may be curved toward the light-emitting region 010 of the third color sub-pixel 103.

[0186] In some examples, as shown in Figures 13 and 14, the first electrode 110 of each sub-pixel includes a main electrode 111 and a connecting electrode 112, and the main electrode 111 is similar in shape to the light-emitting area 010 of the sub-pixel 10; the positive projection of the connecting electrode 112 of at least one sub-pixel on the base substrate 01 does not overlap with the positive projection of the limiting structure 300 and the opening 201 on the base substrate 01.

[0187] For example, as shown in Figures 13 and 14 , in a direction perpendicular to the base substrate 01 , the main electrode 111 overlaps the first opening 210 of the pixel-defining pattern 200, while the connecting electrode 112 does not overlap the first opening 210 of the pixel-defining pattern 200. For example, the connecting electrode 112 is configured to electrically connect to a light-emission control transistor in the pixel circuit. For example, the first electrode 110 of the third-color sub-pixel 103, in addition to the main electrode 111 and the connecting electrode 112, also includes a light shielding portion 113 to shield certain structures in the pixel circuit from light.

[0188] For example, as shown in Figures 13 and 14, the orthographic projections of the connecting electrodes 112 of at least some of the sub-pixels 10 on the substrate substrate 01 do not overlap with the orthographic projections of the defining structure 300 and the opening 201 on the substrate substrate 01. For example, the orthographic projections of the connecting electrodes 112 of each sub-pixel 10 on the substrate substrate 01 do not overlap with the orthographic projections of the defining structure 300 and the opening 201 on the substrate substrate 01. For example, the orthographic projection of the connecting electrode 112 of at least one sub-pixel 10 on the substrate substrate 01 overlaps with the orthographic projection of at least one of the defining structure 300 and the opening 201 on the substrate substrate 01. For example, the orthographic projection of the connecting electrode 112 of at least one sub-pixel 10 on the substrate substrate 01 overlaps with at least one of the orthographic projections of the defining structure 300 and the opening 201 on the substrate substrate 01, and the overlapping size does not exceed 1 micron.

[0189] For example, as shown in Figures 13 and 14, the connection electrode 112 is configured to be electrically connected to the light emission control transistor through a via hole in the insulating layer between the connection electrode 112 and the light emission control transistor, and along a direction perpendicular to the substrate, the defining structure 300 and the opening 201 do not overlap with the via hole in at least one sub-pixel 10. For example, along a direction perpendicular to the substrate, the defining structure 300 and the opening 201 do not overlap with the via hole in each sub-pixel 10.

[0190] In the examples shown in Figures 13 and 14, except for the shape and position of the defining structure 300 and the second opening 220 being different from the shape and position of the defining structure 300 and the second opening 220 in the display substrate shown in Figures 1 to 3, the other structures in the display substrate shown in Figures 13 and 14 may have the same features as the corresponding structures in the display substrate shown in Figures 1 to 3, and detailed description thereof is omitted. For example, the cross-section of the defining structure 300 in the display substrate shown in Figure 10 may have the same features as the cross-section of the defining structure 300 in the display substrate shown in Figures 1 to 3, and detailed description thereof is omitted.

[0191] For example, Figures 13 and 14 schematically illustrate that one sub-definition structure 330 is disposed between two adjacent sub-pixels 10, but the present invention is not limited thereto. Two sub-definition structures 330 may also be disposed between two adjacent sub-pixels 10. For example, Figures 13 and 14 schematically illustrate that the definition structure 300 is spaced apart from the first electrode 110, but the present invention is not limited thereto. The definition structure 300 may also cover the edge of the first electrode 110. For example, Figures 13 and 14 schematically illustrate that the definition structure 300 is exposed by the second opening 220, but the present invention is not limited thereto. The definition structure 300 may also be exposed by the first opening 210.

[0192] For example, as shown in Figure 13, at least one sub-defining structure 330 has a length of L11, and the length of the second opening 220 overlapping the sub-defining structure 330 is L12, where L11 is greater than L12. Thus, the extent to which the light-emitting functional layer of a sub-pixel is blocked is determined by the size of the second opening. For example, at least one sub-defining structure 330 has a length of L10, and the length of the second opening 220 overlapping the sub-defining structure 330 is L20, where L10 is substantially equal to L20. Therefore, it is necessary to manage the uniformity of the pixel-defining pattern and the defining structure at different locations on the display substrate to ensure uniform blocking of the light-emitting functional layer. The length of the sub-defining structure 330 can be the maximum dimension of the sub-defining structure 330 along its extension direction, and the length of the second opening 220 can be the maximum dimension of the second opening 220 along the extension direction of the sub-defining structure 330.

[0193] It should be noted that the cross-sectional views shown in Figures 1 to 16 are only schematic. For example, the surface of the pixel defining portion away from the substrate may have a flat surface at some positions and may have an arc-shaped surface at some positions. The width, height, corners and other features of the defined structure and the width, height, corners and other features of the pixel defining portion in each cross-sectional view are only schematic and do not represent specific dimensional relationships and specific morphological features.

[0194] FIG17 is a schematic diagram of a partial planar structure of a display substrate provided according to another example of an embodiment of the present disclosure. FIG18 is an enlarged partial view of the display substrate shown in FIG17 . The display substrates shown in FIG17 and FIG18 differ from the display substrate shown in FIG13 in the length relationship between the defining structure 300 and the second opening 220 overlapping therewith. Aside from the length relationship between the defining structure and the second opening overlapping therewith, the other structures of the display substrates shown in FIG17 and FIG18 may have the same features as the corresponding structures of the display substrate shown in FIG13 and will not be further described here.

[0195] For example, as shown in Figures 17 and 18, along the extension direction of the sub-defining structure 300, the length of at least one sub-defining structure 330 is L1, and the length of the second opening 220 overlapping with the sub-defining structure 330 is L2, and L1 is smaller than L2, thereby ensuring that one side edge of the sub-defining structure is completely exposed. The length of the sub-defining structure determines the extent to which the light-emitting functional layer is isolated.

[0196] FIG19 is a schematic diagram of a partial cross-sectional structure of a display substrate provided according to another embodiment of the present disclosure.

[0197] 2 and 19 , the display substrate includes a base substrate 01, a plurality of sub-pixels 10 located on the base substrate 01, and a pixel-defining pattern 200. Each of at least some of the sub-pixels 10 includes a light-emitting functional layer 130, which comprises multiple film layers. The sub-pixels 10 also include a first electrode 110 and a second electrode 120 located on either side of the light-emitting functional layer 130 perpendicular to the base substrate 01 (e.g., perpendicular to the XY plane shown in FIG1 ). The first electrode 110 is located between the light-emitting functional layer 130 and the base substrate 01. The light-emitting functional layer 130 may include a light-emitting layer for emitting light and a charge generation layer 133. The pixel-defining pattern 200 includes a plurality of first openings 210 and a plurality of second openings 220. The plurality of first openings 210 are configured to define the light-emitting regions 010 of at least some of the sub-pixels 10. At least a portion of at least one layer of the light-emitting functional layer 130 located within the first openings 210 is continuous, while at least a portion located within at least one second opening 220 is interrupted. Figures 1 and 2 schematically illustrate that the portion of the film layer in the light-emitting functional layer 130 located in the first opening 210 is continuous, and the portion located in the second opening 220 is interrupted. Each sub-pixel 10 corresponds to at least one first opening 210, and at least a portion of the light-emitting functional layer 130 of the sub-pixel 10 is located in the first opening 210 corresponding to the sub-pixel 10. The first opening 210 is configured to expose the first electrode 110.

[0198] As shown in FIG19 , the display substrate further includes a defining structure 300 located on the base substrate 01. The defining structure 300 is located at least between two adjacent sub-pixels 10 of different colors. The defining structure 300 includes a first portion 310 covering the surface of the pixel defining portion 230 on the side facing away from the base substrate 01, and a second portion 320 located within the second opening 220. The second portion 320 of the defining structure 300 is configured to block the at least one layer of the light-emitting functional layer. For example, the first portion 310 of the defining structure 300 is located on the side of the pixel defining portion 230 facing away from the base substrate 01, and the first portion 312 of the defining structure 300 overlaps with the pixel defining portion 230 in a direction perpendicular to the base substrate 01. For example, at least a portion of the second portion 320 of the defining structure 300 does not overlap with the pixel defining portion 230 in a direction perpendicular to the base substrate 01. For example, at least a portion of the second portion 320 of the defining structure 300 covers the side edges of the pixel defining portion 230. For example, along a direction perpendicular to the base substrate 01 , the second portion 320 of the defining structure 300 does not overlap with the surface of the pixel defining portion 230 on a side away from the base substrate 01 .

[0199] As shown in FIG19 , the material of the defining structure 300 includes an organic material, and the edge of the surface of the second portion 320 of the defining structure 300 on the side away from the base substrate 01 protrudes relative to the edge of the surface on the side close to the base substrate 01. For example, the angle between the side surface of the second portion 320 of the defining structure 300 and the plane of the surface of the defining structure 300 on the side close to the base substrate 01 is greater than 20 degrees and less than 90 degrees.

[0200] The first part of the limiting structure using organic material provided by the present disclosure covers the pixel limiting part, and the second part falls into the second opening. At the same time, the edge of the surface of the second part of the limiting structure on the side away from the substrate is set to protrude relative to the edge of the surface on the side close to the substrate. This can not only isolate at least one layer of the light-emitting functional layer between sub-pixels of different colors to reduce crosstalk, but also ensure the flatness of the electrode of the sub-pixel and the normal light output effect, while minimizing the impact of the limiting structure on the process and production capacity.

[0201] In some examples, as shown in FIG19 , the edge of the surface of the first portion 310 of the defining structure 300 on the side closer to the substrate 01 protrudes relative to the edge of the surface on the side farther from the substrate 01, and the thickness of the first portion 310 of the defining structure 300 is less than the thickness of at least a portion of the second portion 320 of the defining structure 300. For example, the thickness of the first portion 310 of the defining structure 300 is less than the thickness of the portion of the second portion 320 of the defining structure 300 that does not overlap with the pixel-defining portion 230. For example, the thickness of the first portion 310 of the defining structure 300 is less than the thickness of the portion of the second portion 320 of the defining structure 200 that overlaps with the pixel-defining portion 230.

[0202] 19 , the thickness of the second portion 320 of the defining structure 300 is greater than the thickness of the pixel defining portion 230. For example, the thickness of the second portion 320 of the defining structure 300 at each location is greater than the thickness of the pixel defining portion 230. For example, the thickness of the first portion 310 of the defining structure 300 is less than the thickness of the pixel defining portion 230.

[0203] 19 , the dimension of the defining structure 300 covering the pixel defining portion 230 is no greater than 20 microns. For example, the dimension of the defining structure 300 covering the pixel defining portion 230 is no greater than 15 microns, or no greater than 14 microns, or no greater than 13 microns, or no greater than 10 microns, etc.

[0204] Except for the different positional relationship between the limiting structure and the pixel limiting portion perpendicular to the base substrate in the display substrate shown in Figure 19, other structures, such as the shapes of the sub-pixels, the first opening and the second opening, the size relationship between the limiting structure and the second opening, etc., can have the same characteristics as the corresponding structures in the display substrate shown in Figures 1 to 18, and will not be repeated here.

[0205] 20 is a schematic block diagram of a display device according to another embodiment of the present disclosure. Another embodiment of the present disclosure provides a display device, which includes any of the above-mentioned display substrates.

[0206] For example, the display device further includes a cover plate located on the light-emitting side of the display substrate.

[0207] For example, the display device can be a display device such as an organic light emitting diode display device, as well as any product or component with a display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, navigator, etc. that includes the display device, but this embodiment is not limited to this.

[0208] There are a few points to note:

[0209] (1) The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures can refer to general designs.

[0210] (2) In the absence of conflict, features in the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0211] The foregoing description is merely an exemplary embodiment of the present disclosure and is not intended to limit the scope of protection of the present disclosure. The scope of protection of the present disclosure is determined by the appended claims.

Claims

1. A display substrate, comprising: A substrate; A plurality of sub-pixels located on the substrate, each of at least some of the sub-pixels including a light-emitting functional layer, the light-emitting functional layer including a plurality of film layers; A pixel definition pattern located on the substrate, the pixel definition pattern including a plurality of openings and a pixel definition portion surrounding the plurality of openings, at least a portion of at least one layer of the light-emitting functional layer being interrupted in at least one opening; A defining structure located between the pixel definition portion and the substrate; Wherein the defining structure is at least located between adjacent two sub-pixels of different colors, the defining structure including a first portion covered by the pixel definition portion and a second portion exposed by the opening, and the second portion of the defining structure being configured to interrupt the at least one layer of the light-emitting functional layer; The material of the defining structure includes an organic material, and a projection of an edge of a side surface of the second portion of the defining structure away from the substrate side on the substrate falls within a projection of the opening on the substrate.

2. The display substrate according to claim 1, wherein The plurality of openings include a plurality of first openings and a plurality of second openings, the plurality of first openings being configured to define a light-emitting region of the at least some of the sub-pixels, at least a portion of at least one layer of the light-emitting functional layer located in the first openings being a continuous portion, and at least a portion located in at least one second opening being interrupted; The second portion of the defining structure is exposed by at least one of the first opening and the second opening.

3. The display substrate according to claim 1, wherein, The thickness of the defining structure is not greater than 5 micrometers, and an edge of a surface of the second portion of the defining structure away from the substrate side protrudes relative to an edge of a surface of the second portion of the defining structure close to the substrate side, and the protruding dimension is not greater than 5 micrometers.

4. The display substrate according to claim 1, wherein, An angle between a side surface of the second portion of the defining structure and a plane of a first surface of the defining structure close to the substrate side is greater than 20 degrees and less than 90 degrees; A projection of the first surface on the substrate falls within a projection of a second surface of the second portion of the defining structure away from the substrate side on the substrate, and a distance between a projection of an edge of the first surface and a projection of an edge of the second surface is not greater than 5 micrometers.

5. The display substrate according to claim 1, 3 or 4, wherein Each of the at least some of the sub-pixels further includes a first electrode and a second electrode located on both sides of the light-emitting functional layer, the first electrode being located between the light-emitting functional layer and the substrate; The thickness of the defining structure is greater than the thickness of the first electrode, and at least a portion of a position where the pixel definition portion does not overlap with the defining structure in a direction perpendicular to the substrate has a thickness greater than the thickness of the defining structure.

6. The display substrate according to claim 5, wherein, The defining structure covers an edge of the first electrode.

7. The display substrate according to claim 6, wherein, The plurality of openings include a plurality of first openings, the plurality of first openings being configured to define a light-emitting region of the at least some of the sub-pixels, at least a portion of at least one layer of the light-emitting functional layer located in the first openings being a continuous portion, and the second portion of the defining structure is at least exposed by the first opening.

8. The display substrate according to claim 6, wherein, The plurality of openings include a plurality of first openings and a plurality of second openings. The plurality of first openings are configured to define the light-emitting regions of at least some of the sub-pixels. At least a part of at least one layer of the light-emitting functional layer located in the first openings is a continuous part, and at least a part of the light-emitting functional layer located in at least one second opening is interrupted; The orthographic projection of the defining structure on the substrate does not overlap with the orthographic projection of the first opening on the substrate, and the second opening exposes a second part of the defining structure.

9. The display substrate according to any one of claims 6-8, wherein, In the arrangement direction of two adjacent sub-pixels of different colors, the size of the defining structure covering the first electrode is not greater than 5 micrometers.

10. The display substrate according to any one of claims 1-5, wherein, Each of the at least some of the sub-pixels further includes a first electrode and a second electrode located on both sides of the light-emitting functional layer. The first electrode is located between the light-emitting functional layer and the substrate; An insulating layer is provided between the first electrode and the substrate. Both the first electrode and the defining structure are in contact with the surface of the insulating layer, and the first electrode and the defining structure are spaced apart. The distance between the defining structure and the nearest first electrode is not greater than 10 micrometers.

11. The display substrate according to any one of claims 1-10, further comprising: Spacers located on a side of the pixel defining portion away from the substrate; wherein the material of the defining structure is different from the material of the spacers.

12. The display substrate according to claim 11, wherein, The thickness of the spacers is not greater than 5 micrometers, and the thickness of the pixel defining portion is not greater than 5 micrometers.

13. The display substrate according to claim 11 or 12, wherein, The orthographic projection of the spacers on the substrate overlaps with the orthographic projection of the defining structure on the substrate; or, the orthographic projection of the spacers on the substrate does not overlap with the orthographic projection of the defining structure on the substrate.

14. The display substrate according to claim 1, wherein, The portion of the defining structure located between two adjacent sub-pixels of different colors includes at least one sub-defining structure.

15. The display substrate according to claim 14, wherein, The two adjacent sub-pixels of different colors include a first-color sub-pixel and a second-color sub-pixel. The at least one sub-defining structure includes one sub-defining structure. The edge of the first part of the sub-defining structure is closer to the edge of the light-emitting region of the first-color sub-pixel.

16. The display substrate according to claim 15, wherein, The first-color sub-pixel includes a red sub-pixel or a green sub-pixel, and the second-color sub-pixel includes a blue sub-pixel.

17. The display substrate according to claim 14, wherein, The plurality of openings include a plurality of first openings and a plurality of second openings. The plurality of first openings are configured to define the light-emitting regions of at least some of the sub-pixels. At least a part of at least one layer of the light-emitting functional layer located in the first openings is a continuous part, and at least a part of the light-emitting functional layer located in at least one second opening is interrupted; The at least one sub-defining structure includes two spaced-apart sub-defining structures. A second part of one of the two sub-defining structures is exposed by the first opening, and a second part of the other of the two sub-defining structures is exposed by the second opening.

18. The display substrate according to claim 14, wherein, The at least one sub-defining structure includes two spaced-apart sub-defining structures. Opposite edges of the two sub-defining structures are both exposed by the same opening.

19. The display substrate according to claim 14, wherein, The multiple openings include multiple first openings and multiple second openings. The multiple first openings are configured to define the light-emitting regions of at least some of the sub-pixels. At least a part of at least one layer of the light-emitting functional layer located in the first openings is a continuous part, and at least a part located in at least one second opening is interrupted; The at least one sub-defining structure includes one sub-defining structure. One side edge of the one sub-defining structure is exposed by the first opening, and the other side edge of the one sub-defining structure is exposed by the second opening.

20. The display substrate according to claim 14, wherein The at least one sub-defining structure includes an annular sub-defining structure surrounding the light-emitting region of at least one sub-pixel.

21. The display substrate according to claim 17, wherein, The two sub-defining structures are respectively two annular sub-defining structures surrounding the light-emitting regions of the adjacent two different-color sub-pixels.

22. The display substrate according to claim 10, wherein, The first electrode of each sub-pixel includes a main electrode and a connecting electrode. The main electrode overlaps with the light-emitting region of the sub-pixel and has a similar shape; The positive projection of the connecting electrode of at least one sub-pixel on the substrate does not overlap with the positive projections of the defining structure and the opening on the substrate.

23. The display substrate according to claim 11 or 12, wherein The multiple openings include multiple first openings and multiple second openings. The multiple first openings are configured to define the light-emitting regions of at least some of the sub-pixels. At least a part of at least one layer of the light-emitting functional layer located in the first openings is a continuous part, and at least a part located in at least one second opening is interrupted; The defining structure includes multiple defining parts and a connecting part connecting at least a part of the multiple defining parts. Along the direction perpendicular to the substrate, the defining part overlaps with the second opening, and the positive projection of the connecting part on the substrate completely falls within the positive projection of the pixel defining part on the substrate; The positive projection of the spacer on the substrate completely falls within the positive projection of the connecting part on the substrate.

24. The display substrate according to claim 2, wherein, The shape of at least one second opening is elongated. The at least one second opening is located between the adjacent two different-color sub-pixels, and the long side of the elongated shape is perpendicular to the arrangement direction of the adjacent two different-color sub-pixels.

25. The display substrate according to claim 24, wherein, The long side of the elongated shape is parallel to the side of the first opening closest to it.

26. The display substrate according to claim 14, wherein, Along the extending direction of the sub-defining structure, the length of the opening overlapping with the sub-defining structure is greater than or less than the length of the sub-defining structure.

27. A display substrate, comprising: A substrate; Multiple sub-pixels located on the substrate. Each of at least some of the sub-pixels includes a light-emitting functional layer, and the light-emitting functional layer includes multiple film layers; A pixel defining pattern located on the substrate. The pixel defining pattern includes multiple first openings, multiple second openings, and a pixel defining part surrounding the multiple first openings and the multiple second openings, The multiple first openings are configured to define the light-emitting regions of at least some of the sub-pixels. At least a part of at least one layer of the light-emitting functional layer located in the first openings is a continuous part, and at least a part located in at least one second opening is interrupted; A defining structure located on the substrate, The limiting structure is located at least between two adjacent sub-pixels of different colors, and includes a first portion covering a surface of the pixel limiting portion on a side away from the base substrate and a second portion located in the second opening, and the second portion of the limiting structure is configured to separate the at least one layer of the light-emitting functional layer; The material of the limiting structure includes an organic material, and the edge of the surface of the second portion of the limiting structure on the side away from the base substrate protrudes relative to the edge of the surface on the side close to the base substrate.

28. The display substrate according to claim 27, wherein, The edge of the surface of the first part of the limiting structure close to the substrate protrudes relative to the edge of the surface away from the substrate, and the thickness of the first part is smaller than the thickness of the second part at at least part of the position.

29. A display device comprising the display substrate according to any one of claims 1 to 28.

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