Display substrate and display device

Abstract

A display substrate and a display device. The display substrate comprises sub-pixels (100), a pixel defining pattern (200), an isolation layer (300), and an insulating layer (400). The pixel defining pattern (200) comprises first openings (210), second openings (220), and a pixel defining portion (230). The first openings (210) expose first electrodes (110) of the sub-pixels (100). The isolation layer (300) and the insulating layer (400) are located between the first electrodes (110) and a base substrate (01). The insulating layer (400) comprises recesses (410) located between adjacent sub-pixels (100). Each recess (410) comprises a first edge (411) exposed by a corresponding second opening (220). The isolation layer (300) comprises first protrusions (301) protruding relative to the first edges (411) to isolate light-emitting functional layers (130). Two adjacent sub-pixels (100) comprise a first sub-pixel (101) and a second sub-pixel (102) having a luminous efficiency greater than that of the first sub-pixel (101). The isolation layer (300) comprises first isolation portions (310) overlapping the first sub-pixels (101) and second isolation portions (320) overlapping the second sub-pixels (102). Each first isolation portion (310) comprises a corresponding first protrusion (301). An opening of each recess (410) comprises a second edge (412). The second isolation portions (320) each comprise a second protrusion (302) protruding relative to the corresponding second edge (412) and covered by the pixel defining portion (230), so as to alleviate ghosting of the second sub-pixels (102).

Description

Display substrate and display device

[0001] This application claims priority to Chinese Patent Application No. 202510191860.6, filed on February 20, 2025, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] This disclosure relates to a display substrate and a display device. Background Technology

[0003] Organic light-emitting diode (OLED) displays offer advantages such as rich colors, fast response times, and foldability. OLED displays with a tandem structure improve lifespan and brightness by adding at least one light-emitting layer and a charge-generating layer, thus extending standby time and overall lifespan. Summary of the Invention

[0004] This disclosure provides a display substrate and a display device.

[0005] Embodiments of this disclosure provide a display substrate, including: a substrate and a plurality of sub-pixels, a pixel defining pattern, an isolation layer, and an insulating layer located on the substrate. Each sub-pixel, at least a portion thereof, includes a first electrode, a light-emitting functional layer, and a second electrode stacked thereon. The first electrode is located between the light-emitting functional layer and the substrate, and the light-emitting functional layer includes a plurality of film layers. The pixel defining pattern is located on the side of the first electrode away from the substrate, and the pixel defining pattern includes a plurality of first openings, a plurality of second openings, and pixel defining portions surrounding the plurality of first openings and the plurality of second openings. The plurality of first openings are configured to expose the first electrode of the plurality of sub-pixels. The isolation layer is located between the first electrode and the substrate. The insulating layer is located between the isolation layer and the substrate. The insulating layer includes a groove located between adjacent sub-pixels, the groove opening including a first edge exposed by a second opening, the isolation layer including a first protrusion projecting relative to the first edge, the first protrusion being configured to block at least one layer of the light-emitting functional layer; the adjacent sub-pixels include a first sub-pixel and a second sub-pixel, the first sub-pixel having a lower luminous efficiency than the second sub-pixel, the isolation layer including a first isolation portion and a second isolation portion, the first isolation portion overlapping a first electrode of the first sub-pixel, the second isolation portion overlapping a first electrode of the second sub-pixel, the first isolation portion including the first protrusion; the groove opening including a second edge, the second isolation portion including a second protrusion projecting relative to the second edge, the pixel defining portion covering the second protrusion and a portion of the groove.

[0006] For example, according to an embodiment of this disclosure, the light-emitting functional layer and the second electrode are both disconnected at the edge of the first protrusion. The light-emitting functional layer includes a charge-generating layer. The charge-generating layer and the second electrode are in contact on the side of the first protrusion away from the substrate. The charge-generating layer and the second electrode are spaced apart on the side of the first protrusion close to the substrate.

[0007] For example, according to an embodiment of this disclosure, both the light-emitting functional layer and the second electrode are disconnected at the edge of the first protrusion, and the ratio of the distance between the adjacent first opening of the light-emitting area of ​​the adjacent sub-pixel and the edge of the first protrusion is configured to be 0.95 to 1.05.

[0008] For example, according to an embodiment of this disclosure, both the light-emitting functional layer and the second electrode are disconnected at the edge of the first protrusion. The adjacent first opening configured to define the light-emitting area of ​​the adjacent sub-pixel includes a first sub-opening and a second sub-opening. The first sub-opening is configured to define the light-emitting area of ​​the first sub-pixel, and the second sub-opening is configured to define the light-emitting area of ​​the second sub-pixel. The distance between the first sub-opening and the edge of the first protrusion is greater than the distance between the second sub-opening and the edge of the first protrusion.

[0009] For example, according to an embodiment of this disclosure, an adjacent first opening configured to define the light-emitting area of ​​the adjacent sub-pixel includes a first sub-opening and a second sub-opening. The distance between the second opening located between the first sub-opening and the second sub-opening and the distance between the first sub-opening and the second sub-opening are a first distance and a second distance, respectively. The ratio of the first distance to the second distance is 0.95 to 1.05.

[0010] For example, according to an embodiment of this disclosure, the distance between the second opening located between the first sub-opening and the second sub-opening and the first sub-opening is a first distance, and the distance between the second opening and the second sub-opening is a second distance, wherein the first distance is greater than the second distance.

[0011] For example, according to an embodiment of this disclosure, the first sub-pixel includes a blue sub-pixel, and the second sub-pixel includes a green sub-pixel.

[0012] Embodiments of this disclosure provide a display substrate, including: a substrate and a plurality of sub-pixels, a pixel defining pattern, an isolation layer, and an insulating layer located on the substrate. Each sub-pixel, at least a portion thereof, includes a first electrode, a light-emitting functional layer, and a second electrode stacked thereon. The first electrode is located between the light-emitting functional layer and the substrate, and the light-emitting functional layer includes a plurality of film layers. The pixel defining pattern is located on the side of the first electrode away from the substrate, and the pixel defining pattern includes a plurality of first openings, a plurality of second openings, and pixel defining portions surrounding the plurality of first openings and the plurality of second openings. The plurality of first openings are configured to expose the first electrode of the plurality of sub-pixels. The isolation layer is located between the first electrode and the substrate. The insulating layer is located between the isolation layer and the substrate. The insulating layer includes a groove located between adjacent sub-pixels, the adjacent sub-pixels including a first sub-pixel and a second sub-pixel. The isolation layer includes a first isolation portion and a second isolation portion, the first isolation portion overlapping a first electrode of the first sub-pixel, and the second isolation portion overlapping a first electrode of the second sub-pixel. The first isolation portion includes a first protrusion protruding relative to the edge of the groove opening, and the second isolation portion includes a second protrusion protruding relative to the edge of the groove opening. Both the first protrusion and the second protrusion are configured to block at least one layer of the light-emitting functional layer. A second opening exposes at least a portion of the groove. Along the arrangement direction of the adjacent sub-pixels, the size of at least one of the first isolation portion and the second isolation portion exposed by the second opening is smaller than the distance between the first protrusion and the second protrusion.

[0013] For example, according to an embodiment of this disclosure, both the first protrusion and the second protrusion are exposed by the second opening to isolate the light-emitting functional layer and the second electrode, and along the arrangement direction, the size of the first isolation portion and the second isolation portion exposed by the second opening is smaller than the distance between the first protrusion and the second protrusion.

[0014] For example, according to an embodiment of this disclosure, an adjacent first opening configured to define the light-emitting area of ​​the adjacent sub-pixel includes a first sub-opening and a second sub-opening. The first sub-opening is configured to define the light-emitting area of ​​the first sub-pixel, and the second sub-opening is configured to define the light-emitting area of ​​the second sub-pixel. The ratio of the distance between the first sub-opening and the edge of the first protrusion to the distance between the second sub-opening and the edge of the second protrusion is 0.95 to 1.05.

[0015] For example, according to an embodiment of this disclosure, the luminous efficiency of the first sub-pixel is less than that of the second sub-pixel, and the adjacent first opening configured to define the luminous area of ​​the adjacent sub-pixel includes a first sub-opening and a second sub-opening. The first sub-opening is configured to define the luminous area of ​​the first sub-pixel, and the second sub-opening is configured to define the luminous area of ​​the second sub-pixel. The distance between the first sub-opening and the edge of the first protrusion is greater than the distance between the second sub-opening and the edge of the second protrusion.

[0016] For example, according to an embodiment of this disclosure, the first sub-pixel and the second sub-pixel are two different colored sub-pixels selected from blue, green and red.

[0017] For example, according to an embodiment of this disclosure, the first sub-pixel includes a blue sub-pixel, and the second sub-pixel includes a green sub-pixel.

[0018] For example, according to an embodiment of this disclosure, the material of the isolation layer includes an inorganic non-metallic material, the material of the insulating layer includes an organic material, the two side surfaces of the isolation layer are in contact with the first electrode and the insulating layer respectively, and the orthogonal projection of the first electrode on the substrate is completely located within the orthogonal projection of the isolation layer on the substrate.

[0019] For example, according to an embodiment of this disclosure, at least one recess is provided on the surface of the pixel defining portion between adjacent sub-pixels away from the substrate, the depth of the recess is not less than the thickness of the light-emitting functional layer, and the distance between the bottom of the recess and the substrate is greater than the distance between the surface of the first electrode away from the substrate and the substrate.

[0020] For example, according to an embodiment of this disclosure, the at least one recess includes a plurality of recesses, and the recesses are provided on both sides of the first protrusion located between the adjacent sub-pixels along the arrangement direction of the adjacent sub-pixels.

[0021] For example, according to an embodiment of this disclosure, each of the at least one recessed portion has a cross-section formed by a plane parallel to the arrangement direction of the adjacent sub-pixels and perpendicular to the substrate, which includes two side edges and a bottom edge. Along the direction of the insulating layer away from the substrate, the distance between the two side edges gradually increases, and the angle at the connection point between at least one side edge and the bottom edge is 100 to 110 degrees.

[0022] For example, according to an embodiment of this disclosure, the thickness of the portion of the light-emitting functional layer on the sidewall of the at least one recess is less than the thickness of the portion of the light-emitting functional layer within the first opening.

[0023] For example, according to an embodiment of this disclosure, the orthographic projection of the bottom of the recess on the substrate does not overlap with the orthographic projection of the first electrode on the substrate.

[0024] For example, according to an embodiment of this disclosure, the bottom of the recess overlaps with the first electrode in a direction perpendicular to the substrate, and the distance between the bottom of the recess and the first electrode is greater than 2000 angstroms.

[0025] For example, according to an embodiment of this disclosure, the display substrate further includes: a spacer located on the side of the pixel defining portion away from the substrate, wherein the orthographic projection of the spacer on the substrate does not overlap with the orthographic projection of the groove on the substrate.

[0026] Embodiments of this disclosure provide a display substrate, including: a substrate and a plurality of sub-pixels, a pixel defining pattern, and an insulating layer disposed on the substrate. Each sub-pixel, at least a portion thereof, includes a first electrode, a light-emitting functional layer, and a second electrode stacked thereon, the first electrode being located between the light-emitting functional layer and the substrate, the light-emitting functional layer including a plurality of film layers; a pixel defining pattern being located on the side of the first electrode away from the substrate, the pixel defining pattern including a plurality of first openings, a plurality of second openings, and pixel defining portions surrounding the plurality of first openings and the plurality of second openings, the plurality of first openings being configured to expose the first electrode of the plurality of sub-pixels; and an insulating layer being located between the first electrode and the substrate. At least one recess is provided on the surface of the pixel defining portion between adjacent sub-pixels away from the substrate. The depth of the recess is not less than the thickness of the light-emitting functional layer, and the distance between the bottom of the recess and the substrate is greater than the distance between the surface of the first electrode away from the substrate and the substrate. Each of the at least one recess is cut by a plane parallel to the arrangement direction of the adjacent sub-pixels and perpendicular to the substrate, which includes two side edges and a bottom edge. Along the direction of the insulating layer away from the substrate, the distance between the two side edges gradually increases, and the angle at the connection point of at least one side edge and the bottom edge is 100 to 110 degrees. The insulating layer includes a groove located between adjacent sub-pixels, and the second opening exposes at least a portion of the groove.

[0027] For example, according to an embodiment of this disclosure, the display substrate further includes: an isolation layer located between the first electrode and the insulating layer, wherein two side surfaces of the isolation layer are in contact with the first electrode and the insulating layer, respectively; the material of the isolation layer includes an inorganic non-metallic material, and the material of the insulating layer includes an organic material. The adjacent sub-pixels include a first sub-pixel and a second sub-pixel, wherein the luminous efficiency of the first sub-pixel is less than that of the second sub-pixel; the isolation layer includes a first isolation portion and a second isolation portion, wherein the first isolation portion overlaps with the first electrode of the first sub-pixel, and the second isolation portion overlaps with the first electrode of the second sub-pixel; the groove opening includes a first edge and a second edge disposed opposite to each other; the first isolation portion includes a first protrusion protruding relative to the first edge; the second isolation portion includes a second protrusion protruding relative to the second edge; the pixel defining portion covers the first protrusion, and the second opening exposes the second protrusion.

[0028] For example, according to an embodiment of this disclosure, the first electrode is in contact with the insulating layer, the insulating layer being made of an organic material.

[0029] For example, according to an embodiment of this disclosure, the at least one recess includes a plurality of recesses, and the recesses are provided on both sides of the second opening located between the adjacent sub-pixels along the arrangement direction of the adjacent sub-pixels.

[0030] For example, according to an embodiment of this disclosure, along the arrangement direction of the adjacent sub-pixels, the groove opening includes a first edge and a second edge disposed opposite to each other, and the pixel defining portion covers the first edge and the second edge.

[0031] For example, according to an embodiment of this disclosure, along the arrangement direction of the adjacent sub-pixels, the groove opening includes a first edge and a second edge disposed opposite to each other, and the second opening exposes at least one of the first edge and the second edge.

[0032] For example, according to an embodiment of this disclosure, the thickness of the portion of the light-emitting functional layer on the sidewall of the at least one recess is less than the thickness of the portion of the light-emitting functional layer within the first opening.

[0033] For example, according to an embodiment of this disclosure, the orthographic projection of the bottom of the recess on the substrate does not overlap with the orthographic projection of the first electrode on the substrate.

[0034] For example, according to an embodiment of this disclosure, the bottom of the recess overlaps with the first electrode in a direction perpendicular to the substrate, and the distance between the bottom of the recess and the first electrode is greater than 2000 angstroms.

[0035] This disclosure provides a display device, including the display substrate of any of the above embodiments. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0037] Figure 1 is a partial planar structure schematic diagram of a display substrate provided according to an embodiment of the present disclosure.

[0038] Figure 2 is a schematic diagram of a partial cross-sectional structure cut along line AA' shown in Figure 1.

[0039] Figure 3 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] Figures 4A, 4B, and 5 are schematic diagrams of partial cross-sectional structures of display substrates provided according to different examples of embodiments of the present disclosure.

[0041] Figure 6 is a partial planar structure schematic diagram of a display substrate provided according to another embodiment of the present disclosure.

[0042] Figure 7 is a schematic diagram of a partial cross-sectional structure cut along line BB' shown in Figure 6.

[0043] Figures 8 and 9 are schematic diagrams of partial cross-sectional structures of display substrates provided according to different examples of embodiments of the present disclosure.

[0044] Figure 10 is a schematic diagram of a partial planar structure of a display substrate according to another example of an embodiment of the present disclosure.

[0045] Figure 11 is a partial planar structure schematic diagram of a display substrate provided according to another embodiment of the present disclosure.

[0046] Figure 12 is a schematic diagram of a partial cross-sectional structure cut along line CC' shown in Figure 11.

[0047] Figures 13 to 15 are schematic diagrams of partial cross-sectional structures of display substrates provided according to different examples of another embodiment of the present disclosure.

[0048] Figure 16 is a partial cross-sectional structural schematic diagram of a display substrate provided according to yet another example of a further embodiment of the present disclosure.

[0049] Figure 17 is a schematic block diagram of a display device provided according to another embodiment of the present disclosure. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the described embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0051] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0052] The features such as "parallel," "perpendicular," and "identical" used in the embodiments of this disclosure include features in the strict sense of "parallel," "perpendicular," and "identical," as well as cases where "approximately parallel," "approximately perpendicular," and "approximately identical" include certain errors, taking into account measurement and errors associated with the measurement of a specific quantity (e.g., limitations of the measurement system), and represent the acceptable deviation range for a specific value as determined by a person skilled in the art. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of said value. Unless otherwise specified in the following embodiments of this disclosure, the quantity of a component is implied to mean that the component may be one or more, or can be understood as at least one. "At least one" means one or more, and "more" means at least two. The term "integrated structure" used in the embodiments of this disclosure refers to two or more components formed using the same material in the same patterning process.

[0053] A single-layer organic light-emitting display (OLED) device is an OLED device consisting of a single light-emitting layer, also known as a single device. Due to the limited lifespan of single devices, which fails to meet user needs, tandem technology emerged. Tandem technology involves stacking and connecting two light-emitting layers of a sub-pixel in series, with a charge generation layer, such as a P-type doped charge generation layer (P-CGL) and an N-type doped charge generation layer (N-CGL), between the stacked light-emitting layers. Compared to display substrates without tandem devices, tandem devices use N / P-CGL as a heterojunction to connect the two light-emitting layers in series. This technology achieves dual-light-emitting device series connection, significantly reducing the luminous current of the light-emitting device at the same luminous intensity, thus improving the lifespan of the organic light-emitting element and reducing power consumption.

[0054] In their research, the inventors of this application discovered that crosstalk is particularly severe in tandem devices because they require at least two evaporation processes for the light-emitting material. To mitigate crosstalk, an isolation structure can be placed around the light-emitting area of ​​the sub-pixel to isolate the light-emitting functional layer. However, introducing this isolation structure introduces new optical problems under the new process conditions, such as severe ghosting in the display panel at low brightness. For example, at the edge of the isolation structure, in addition to the light-emitting functional layer, the cathode of the sub-pixel is also isolated. The isolated cathode overlaps with the charge-generating layer, causing a short circuit in the tandem device. Furthermore, the total capacitance of the second layer of light-emitting devices in the tandem device is relatively large.

[0055] This disclosure provides a display substrate and a display device.

[0056] An embodiment of this disclosure provides a display substrate including a substrate and a plurality of sub-pixels, a pixel defining pattern, an isolation layer, and an insulating layer located on the substrate. Each sub-pixel, at least some of which are sub-pixels, includes a first electrode, a light-emitting functional layer, and a second electrode stacked thereon. The first electrode is located between the light-emitting functional layer and the substrate, and the light-emitting functional layer includes a plurality of film layers. The pixel defining pattern is located on the side of the first electrode away from the substrate, and the pixel defining pattern includes a plurality of first openings, a plurality of second openings, and pixel defining portions surrounding the plurality of first openings and the plurality of second openings. The plurality of first openings are configured to expose the first electrodes of the plurality of sub-pixels. The isolation layer is located between the first electrode and the substrate. The insulating layer is located between the isolation layer and the substrate. The insulating layer includes a groove located between adjacent sub-pixels, the groove opening including a first edge exposed by a second opening, the isolation layer including a first protrusion protruding relative to the first edge, the first protrusion being configured to block at least one layer of the light-emitting functional layer; the adjacent sub-pixels include a first sub-pixel and a second sub-pixel, the luminous efficiency of the first sub-pixel being less than the luminous efficiency of the second sub-pixel, the isolation layer including a first isolation portion and a second isolation portion, the first isolation portion overlapping with a first electrode of the first sub-pixel, the second isolation portion overlapping with a first electrode of the second sub-pixel, the first isolation portion including a first protrusion; the groove opening including a second edge, the second isolation portion including a second protrusion protruding relative to the second edge, the pixel defining portion covering the second protrusion and a portion of the groove.

[0057] In the display substrate provided in this disclosure, the first protrusion in the first isolation portion that overlaps with the first sub-pixel with low luminous efficiency blocks the light-emitting functional layer, and the second protrusion in the second isolation portion that overlaps with the second sub-pixel with high luminous efficiency is covered by the pixel limiting portion, which helps to alleviate the ghosting phenomenon of the second sub-pixel and improve the display effect of the display substrate.

[0058] Another embodiment of this disclosure provides a display substrate including a substrate and a plurality of sub-pixels, a pixel defining pattern, an isolation layer, and an insulating layer located on the substrate. The plurality of sub-pixels are located on the substrate, and each sub-pixel, at least a portion thereof, includes a first electrode, a light-emitting functional layer, and a second electrode stacked thereon. The first electrode is located between the light-emitting functional layer and the substrate, and the light-emitting functional layer includes a plurality of film layers. The pixel defining pattern is located on the side of the first electrode away from the substrate, and the pixel defining pattern includes a plurality of first openings, a plurality of second openings, and pixel defining portions surrounding the plurality of first openings and the plurality of second openings. The plurality of first openings are configured to expose the first electrode of the plurality of sub-pixels. The isolation layer is located between the first electrode and the substrate. The insulating layer is located between the isolation layer and the substrate. The insulating layer includes a groove located between adjacent sub-pixels, the adjacent sub-pixels including a first sub-pixel and a second sub-pixel. The isolation layer includes a first isolation portion and a second isolation portion, the first isolation portion overlapping a first electrode of the first sub-pixel, and the second isolation portion overlapping a first electrode of the second sub-pixel. The first isolation portion includes a first protrusion protruding relative to the edge of the groove opening, and the second isolation portion includes a second protrusion protruding relative to the edge of the groove opening. A second opening exposes at least a portion of the groove. Along the arrangement direction of the adjacent sub-pixels, the size of at least one of the first isolation portion and the second isolation portion exposed by the second opening is smaller than the distance between the first protrusion and the second protrusion.

[0059] By setting both protrusions as blocking the light-emitting functional layer, and setting the distance between the two protrusions to be greater than the size at which at least one of the first and second isolation parts is exposed by the second opening, it is possible to reduce crosstalk between the first and second sub-pixels while setting at least one of the distances between the first protrusion and the light-emitting area of ​​the first sub-pixel and the second protrusion and the light-emitting area of ​​the second sub-pixel to be smaller. This reduces the capacitance between the second electrode and the charge generation layer in at least one of the first and second sub-pixels, which helps to reduce the ghosting phenomenon generated by at least one of the first and second sub-pixels.

[0060] In another embodiment of this disclosure, a display substrate includes a substrate and a plurality of sub-pixels, a pixel defining pattern, and an insulating layer located on the substrate. The plurality of sub-pixels are located on the substrate, and each sub-pixel at least some of them includes a first electrode, a light-emitting functional layer, and a second electrode stacked thereon. The first electrode is located between the light-emitting functional layer and the substrate, and the light-emitting functional layer includes a plurality of film layers. The pixel defining pattern is located on the side of the first electrode away from the substrate, and the pixel defining pattern includes a plurality of first openings, a plurality of second openings, and pixel defining portions surrounding the plurality of first openings and the plurality of second openings. The plurality of first openings are configured to expose the first electrode of the plurality of sub-pixels. The insulating layer is located between the first electrode and the substrate. At least one recess is provided on the surface of the pixel defining portion between adjacent sub-pixels away from the substrate. The depth of the recess is not less than the thickness of the light-emitting functional layer, and the distance between the bottom of the recess and the substrate is greater than the distance between the surface of the first electrode away from the substrate and the substrate. Each of the at least one recess is cut by a plane parallel to the arrangement direction of the adjacent sub-pixels and perpendicular to the substrate, which includes two side edges and a bottom edge. Along the direction of the insulating layer away from the substrate, the distance between the two side edges gradually increases, and the angle at the connection point of at least one side edge and the bottom edge is 100 to 110 degrees. The insulating layer includes a groove located between adjacent sub-pixels, and the second opening exposes at least a portion of the groove.

[0061] By providing a groove in the insulating layer that is exposed by the second opening, and a recess in the pixel defining portion, it is beneficial to extend the path of the light-emitting functional layer and reduce crosstalk between adjacent sub-pixels.

[0062] The display substrate and display device provided in the embodiments of this disclosure are described below with reference to the accompanying drawings.

[0063] Figure 1 is a partial planar structural schematic diagram of a display substrate provided according to an embodiment of the present disclosure. Figure 2 is a partial cross-sectional structural schematic diagram taken along line AA' shown in Figure 1.

[0064] As shown in Figures 1 and 2, the display substrate includes a substrate 01, a plurality of sub-pixels 100 located on the substrate 01, a pixel defining pattern 200, an isolation layer 300, and an insulating layer 400. At least some of the sub-pixels 100 include a first electrode 110, a light-emitting functional layer 130, and a second electrode 120 stacked on the substrate 01. The first electrode 110 is located between the light-emitting functional layer 130 and the substrate 01. The light-emitting functional layer 130 includes multiple film layers. For example, the display substrate includes a display area and a peripheral area surrounding the display area. The plurality of sub-pixels 100 are located in the display area of ​​the display substrate. The pixel defining pattern 200 may include portions located in the display area and portions located in the peripheral area. The isolation layer 300 may include portions located in the display area and portions located in the peripheral area. The insulating layer 400 may include portions located in the display area and portions located in the peripheral area.

[0065] For example, as shown in FIG2, the light-emitting functional layer 130 may include a light-emitting layer for emitting light and a charge-generating layer 133. For example, the light-emitting functional layer 130 may be a film layer in an organic light-emitting element. For example, the light-emitting functional layer 130 may include a first light-emitting layer, a charge-generating layer (CGL) 133, and a second light-emitting layer stacked together, with the charge-generating layer 133 located between the first light-emitting layer and the second light-emitting layer. The thicknesses of the multiple film layers included in the light-emitting functional layer 130 shown in FIG2 are only for clear illustration of each film layer and do not represent actual dimensions. For example, in the same sub-pixel 100, the first light-emitting layer and the second light-emitting layer may be light-emitting layers that emit the same color of light. For example, the first light-emitting layer in a sub-pixel 100 that emits different colors of light emits different colors of light. For example, the second light-emitting layer in a sub-pixel 100 that emits different colors of light emits different colors of light. Of course, the embodiments disclosed herein are not limited to this. For example, in the same sub-pixel 100, the first light-emitting layer and the second light-emitting layer can be light-emitting layers that emit different colors of light. By setting light-emitting layers that emit different colors of light in the same sub-pixel 100, the light emitted by the multiple light-emitting layers included in the sub-pixel 100 can be mixed into white light. The color of the light emitted by each sub-pixel 100 can be adjusted by setting a color filter layer.

[0066] For example, as shown in FIG2, the film layer 131 between the charge generation layer 133 and the substrate 01 may include a first light-emitting layer and other functional layers, such as a hole injection layer between the first electrode 110 and the first light-emitting layer; or an electron transport layer between the charge generation layer 133 and the first light-emitting layer. For example, the film layer 132 between the charge generation layer 133 and the second electrode 120 may include a second light-emitting layer and other functional layers, such as a hole transport layer between the second light-emitting layer and the charge generation layer 133; or an electron transport layer and an electron injection layer between the second light-emitting layer and the second electrode 120.

[0067] For example, the hole injection layer, hole transport layer, electron transport layer, electron injection layer, charge generation layer 133, and second electrode 120 are all shared film layers for multiple sub-pixels, and can be called common layers. For example, the aforementioned common layer and second electrode 120 can be full-surface film layers formed using an open mask. For example, the first light-emitting layer and the second light-emitting layer can be film layers formed using a fine metal mask (FMM), and a gap can be set between the light-emitting layers of different sub-pixels.

[0068] For example, as shown in Figure 2, the charge generation layer 133 has strong conductivity, which enables the light-emitting functional layer 130 to have advantages such as long lifetime, low power consumption, and high brightness. For example, the charge generation layer 133 may include an N-type charge generation layer 133 and a P-type charge generation layer 133. For example, the material of the charge generation layer 133 may be a material containing phosphorothoxy groups or a triazine material. 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 material is 10. -2 ~10 2 .

[0069] For example, as shown in Figure 2, the first electrode 110 can be an anode and the second electrode 120 can be a cathode.

[0070] For example, as shown in FIG1, the first electrode 110 includes a main electrode 111 and a connecting electrode 112. The main electrode 111 overlaps with the first opening 210, and the connecting electrode 112 is covered by the pixel defining portion 230. For example, the sub-pixel also includes a pixel circuit, as shown in the structure in the film layer 02 in FIG2, located between the first electrode 110 and the substrate 01. The connecting electrode 112 is electrically connected to the pixel circuit through the isolation layer 300 between it and the pixel circuit and through the via 113 in the insulating layer 400. For example, the shape of the main electrode 111 is similar to the shape of the light-emitting area. For example, the main electrode 111 and the connecting electrode 112 are integrally formed.

[0071] As shown in Figures 1 and 2, the pixel defining pattern 200 is located on the side of the first electrode 110 away from the substrate 01. The pixel defining pattern 200 includes a plurality of first openings 210, a plurality of second openings 220, and a pixel defining portion 230 surrounding the plurality of first openings 210 and the plurality of second openings 220. The plurality of first openings 210 are configured to expose the first electrode 110 of the plurality of sub-pixels 100. For example, the second openings 220 are located in the display area.

[0072] For example, as shown in Figures 1 and 2, the first opening 210 can be a pixel opening used to define the light-emitting area of ​​a sub-pixel. 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. The aforementioned light-emitting area can refer to the area where the sub-pixel 100 effectively emits light, and the shape of the light-emitting area refers to a two-dimensional shape. For example, the shape of the light-emitting area can be the same as the shape of the first opening 210 of the pixel defining pattern 200. The aforementioned light-emitting area can refer to the area defined by the edge of the pixel defining portion 230 in contact with the first electrode 110, and this area can be called a PDL opening.

[0073] Figure 2 schematically shows that the shape of the cross section of the pixel limiting portion 230 surrounding the side of the first opening 210 cut by the XY plane is a straight line, but it is not limited to this, the shape of the cross section of the side can also be a curve.

[0074] For example, as shown in Figures 1 and 2, a sub-pixel 100 corresponds to at least one first opening 210, and at least a portion of the light-emitting functional layer 130 of the sub-pixel 100 is located in the first opening 210 corresponding to the sub-pixel 100.

[0075] For example, as shown in Figures 1 and 2, the material of the pixel limiting portion 230 may include polyimide, acrylic, or polyethylene terephthalate, etc.

[0076] For example, as shown in Figure 2, the portions of each layer in the light-emitting functional layer 130 located in the first opening 210 are continuously arranged, and the portions of the second electrode 120 located in the first opening 210 are also continuously arranged.

[0077] As shown in Figure 2, the isolation layer 300 is located between the first electrode 110 and the substrate 01, and the insulating layer 400 is located between the isolation layer 300 and the substrate 01. The insulating layer 400 includes a groove 410 located between adjacent sub-pixels 100. The groove 410 has a first edge 411 exposed by a second opening 220. The isolation layer 300 includes a first protrusion 301 protruding relative to the first edge 411. The first protrusion 301 is configured to block at least one layer of the light-emitting functional layer 130. For example, the first protrusion 301 is exposed by the second opening 220 to block at least one layer of the light-emitting functional layer 130. The provision of the first protrusion 301 helps to reduce crosstalk between adjacent sub-pixels.

[0078] The aforementioned adjacent sub-pixels are not limited to two sub-pixels adjacent in the X direction, but can also be two sub-pixels adjacent in the Y direction, or two sub-pixels adjacent in other directions. For example, the aforementioned adjacent sub-pixels can refer to two adjacent sub-pixels that emit different colors of light, but are not limited to two fixed colors of sub-pixels. As such, the aforementioned adjacent sub-pixels can include multiple cases, such as three cases including blue sub-pixels and green sub-pixels, red sub-pixels and green sub-pixels, and blue sub-pixels and red sub-pixels.

[0079] For example, as shown in Figure 2, the depth of the groove 410 is greater than the thickness of the light-emitting functional layer and less than the maximum thickness of the insulating layer. The angle between the side surface and the bottom surface of the groove 410 is greater than 90 degrees. The size of the first protrusion 301 is greater than 0.01 micrometers and less than the thickness of the light-emitting functional layer.

[0080] For example, as shown in FIG2, the charge generating layer 133 in the light-emitting functional layer 130 is separated at the edge of the first protrusion 301. This means that the charge generating layer 133 and the film layer between it and the substrate 01 in the light-emitting functional layer 130 are both separated at the edge of the first protrusion 301. For example, each layer in the light-emitting functional layer 130 is separated at the edge of the first protrusion 301. For example, the second electrode 120 is separated at the edge of the first protrusion 301.

[0081] As shown in Figures 1 and 2, adjacent sub-pixels 100 include a first sub-pixel 101 and a second sub-pixel 102. The luminous efficiency of the first sub-pixel 101 is lower than that of the second sub-pixel 102. The isolation layer 300 includes a first isolation portion 310 and a second isolation portion 320. The first isolation portion 310 overlaps with the first electrode 110 of the first sub-pixel 101, and the second isolation portion 320 overlaps with the first electrode 110 of the second sub-pixel 102. The first isolation portion 310 includes a first protrusion 301. For example, the first isolation portion 310 overlapping with the first sub-pixel 101 is used to block at least one layer of the light-emitting functional layer 130. For example, the first isolation portion 310 and the second isolation portion 320 are located in the display area.

[0082] The luminous efficiency described above and thereafter refers to the efficiency of a subpixel in converting electrical energy into light energy. A second subpixel with high luminous efficiency can provide higher brightness with the same power consumption, or consume less electrical energy to achieve the same brightness.

[0083] For example, as shown in Figure 1, the area of ​​the light-emitting region of the first sub-pixel 101 is larger than the area of ​​the second sub-pixel 102.

[0084] As shown in Figure 2, the groove 410 includes a second edge 412, the second isolation portion 320 includes a second protrusion 302 that protrudes relative to the second edge 412, and the pixel limiting portion 230 covers the second protrusion 302 and a portion of the groove 410.

[0085] For example, as shown in FIG2, although the second isolation portion 320 overlapping with the second sub-pixel 102 has a second protrusion 302 protruding from the groove 410, this second protrusion 302 is covered by the pixel defining portion 230, so the second protrusion 302 does not block any film layer in the light-emitting functional layer 130. For example, the first protrusion 301 and the second protrusion 302 protrude towards each other from the groove 410. For example, the distance between the first protrusion 301 and the second protrusion 302 is less than the distance between the first edge 411 and the second edge 412.

[0086] Compared to the situation where the isolation portion overlapping with the second sub-pixel with high luminous efficiency is used to block the light-emitting functional layer, while the isolation portion 310 overlapping with the first sub-pixel with low luminous efficiency does not block the light-emitting functional layer, resulting in severe ghosting of the second sub-pixel and virtually no ghosting of the first sub-pixel, in the display substrate provided by this disclosure, the first protrusion in the first isolation portion overlapping with the first sub-pixel with low luminous efficiency blocks the light-emitting functional layer, and the second protrusion in the second isolation portion overlapping with the second sub-pixel with high luminous efficiency is covered by the pixel limiting portion. This helps to alleviate the ghosting phenomenon of the second sub-pixel and improves the display effect of the display substrate.

[0087] In some examples, as shown in FIG2, the light-emitting functional layer 130 and the second electrode 120 are both disconnected at the edge of the first protrusion 301. The light-emitting functional layer 130 includes a charge-generating layer 133. The charge-generating layer 133 and the second electrode 120 are in contact on the side of the first protrusion 301 away from the substrate 01. The charge-generating layer 133 and the second electrode 120 are spaced apart on the side of the first protrusion 301 close to the substrate 01.

[0088] In contrast to the problem of severe ghosting of the second sub-pixel caused by using an isolation portion overlapping with the second sub-pixel with high luminous efficiency to block the light-emitting functional layer, resulting in the charge generation layer on the second isolation portion contacting the second electrode, the display substrate provided in this disclosure has the location where the charge generation layer 133 contacts the second electrode 120 and generates a short circuit, which is located on the first isolation portion 310. On the one hand, this can alleviate the severe ghosting problem of the second sub-pixel 102; on the other hand, since the luminous efficiency of the first sub-pixel 101 is low, the short circuit problem between the charge generation layer 133 and the second electrode 120 has a smaller impact on the first sub-pixel 101 than the short circuit problem on the second isolation portion 320 has on the second sub-pixel 102. Thus, the difference in ghosting between the first sub-pixel 101 and the second sub-pixel 102 can be balanced.

[0089] In some examples, as shown in Figures 1 and 2, the first sub-pixel 101 includes a blue sub-pixel and the second sub-pixel 102 includes a green sub-pixel. However, it is not limited to this; the first sub-pixel 101 can also be a red sub-pixel and the second sub-pixel 102 can be a green sub-pixel, or the first sub-pixel 101 can be a blue sub-pixel and the second sub-pixel 102 can be a red sub-pixel.

[0090] In some examples, as shown in Figure 2, the material of the isolation layer 300 includes an inorganic non-metallic material, and the material of the insulating layer 400 includes an organic material. The two side surfaces of the isolation layer 300 are in contact with the first electrode 110 and the insulating layer 400, respectively, and the orthographic projection of the first electrode 110 onto the substrate 01 is completely within the orthographic projection of the isolation layer 300 onto the substrate 01. By setting the first electrode 110 so that its orthographic projection is completely within the orthographic projection of the isolation layer 300, the flatness of the first electrode 110 is improved.

[0091] For example, as shown in Figure 2, the material of the insulating layer 300 may include silicon nitride or silicon oxide. For example, the insulating layer 400 may be a planarization layer, and the material of the insulating layer 400 may include materials such as polyimide.

[0092] For example, as shown in FIG2, after forming an insulating layer 400 on a substrate 01, an isolation layer 300 can be formed, and the isolation layer 300 can be etched with an etchant to form a first isolation portion 310, a second isolation portion 320, and a groove 410. Since the etching selectivity of the etchant for the material of the insulating layer 400 is greater than that for the material of the isolation layer 300, the edge of the groove 410 formed after etching is recessed relative to the edge of the isolation layer 300. For example, the first edge 411 of the groove 410 is recessed relative to the edge of the first isolation portion 310, and the second edge 412 of the groove 410 is recessed relative to the edge of the second isolation portion 320.

[0093] Figure 2 shows the second protrusion 302 of the second isolation portion 320 circled with a dashed line, and the first protrusion 301 of the first isolation portion 310 protruding relative to the first edge 411 of the groove 410 is divided by dashed lines. The second protrusion 302 and the part of the second isolation portion 320 other than the second protrusion 302 are integrally formed. The first protrusion 301 and the part of the first isolation portion 310 other than the first protrusion 301 are integrally formed.

[0094] Figure 2 only shows the film layer between the second electrode 120 and the substrate 01. If the second electrode 120 is away from the substrate 01, it can also be provided with spacers (as shown in Figure 10), encapsulation layers and other structures.

[0095] In some examples, as shown in FIG2, the light-emitting functional layer 130 and the second electrode 120 are both disconnected at the edge of the first protrusion 301. The ratio of the distance D1 to D2 between the adjacent first opening 210 and the edge of the first protrusion 301, which is configured to define the light-emitting area of ​​the adjacent sub-pixel 100, is 0.95 to 1.05, which is beneficial to balance the crosstalk between two adjacent sub-pixels.

[0096] For example, as shown in Figure 2, the ratio of the distances D1 to D2 between the edges of adjacent first openings 210 and first protrusions 301 is 1.

[0097] In some examples, as shown in Figures 1 and 2, the adjacent first openings 210 of the first electrode 110 exposing the adjacent sub-pixels 100 include a first sub-opening 211 and a second sub-opening 212. The distances between the second opening 220 located between the first sub-opening 211 and the second sub-opening 212 and the distances between the second opening 220 and the first sub-opening 211 and the second sub-opening 212 are a first distance D10 and a second distance D20, respectively, and the ratio of the first distance D10 to the second distance D20 is 0.95 to 1.05. For example, the ratio of the first distance to the second distance is 1.

[0098] The distance between the first sub-opening 211 and the second opening 220 described above and subsequently can refer to the distance between the edge of the bevel of the pixel limiting portion 230 and the contact position of the first electrode 110 and the edge of the contact position of the pixel limiting portion 230 and the first isolation portion 310. The distance between the second sub-opening 212 and the second opening 220 described above and subsequently can refer to the distance between the edge of the pixel limiting portion 230 and the contact position of the first electrode 110 and the edge of the contact position of the pixel limiting portion 230 and the bottom 241 of the groove 410.

[0099] Since the distance between adjacent first sub-opening 211 and second sub-opening 212 is small, by setting the distance relationship between the first sub-opening 211, the second sub-opening 212 and the second opening 220, the first protrusion 301 can isolate the light-emitting functional layer 130 and the second electrode 120, while avoiding the position of the second opening 220 from affecting the light-emitting area of ​​the sub-pixel.

[0100] Figure 3 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.

[0101] The difference between the display substrate in the example shown in Figure 3 and the display substrate in the example shown in Figure 2 is that the distance between the first protrusion 301 and the first opening 210 located on both sides thereis different.

[0102] In some examples, as shown in FIG3, the light-emitting functional layer 130 and the second electrode 120 are both disconnected at the edge of the first protrusion 301. The adjacent first opening 210 configured to define the light-emitting area of ​​the adjacent sub-pixel includes a first sub-opening 211 and a second sub-opening 212. The first sub-opening 211 is configured to define the light-emitting area of ​​the first sub-pixel 101, and the second sub-opening 212 is configured to define the light-emitting area of ​​the second sub-pixel 102. The distance D1 between the first sub-opening 211 and the edge of the first protrusion 301 is greater than the distance D2 between the second sub-opening 212 and the edge of the first protrusion 301.

[0103] By reducing the distance between the first protrusion 301 and the light-emitting area of ​​the second sub-pixel 102 with higher luminous efficiency, it is beneficial to reduce the overlap area between the charge generation layer 133 of the second sub-pixel 102 and the second electrode 120, reduce the capacitance between the two, and thus improve the ghosting phenomenon generated by the second sub-pixel 102.

[0104] In some examples, as shown in Figure 3, the distance between the second opening 220 located between the first sub-opening 211 and the second sub-opening 212 and the first sub-opening 211 and the second sub-opening 212 is a first distance D10 and a second distance D20, respectively, with the first distance D10 being greater than the second distance D20.

[0105] By setting the second opening 220 closer to the light-emitting area of ​​the second sub-pixel 102 with higher luminous efficiency, while satisfying the requirement that the first protrusion 301 be closer to the light-emitting area of ​​the second sub-pixel 102, a suitable distance can be maintained between the edge of the first protrusion 301 and the pixel limiting portion 230, thus ensuring the blocking effect of the first protrusion 301 on the light-emitting functional layer 130.

[0106] For example, as shown in Figure 3, the ratio of the first distance D10 to the second distance D20 is 1 to 2.

[0107] The display substrate shown in Figure 3, except for the differences between the distances D1 and D2, the first distance D01, and the second distance D02 and the corresponding distances shown in Figure 2, has the same features as the corresponding structures shown in Figure 2, and will not be described again here.

[0108] Figures 4A, 4B, and 5 are schematic diagrams of partial cross-sectional structures of display substrates provided according to different examples of embodiments of the present disclosure.

[0109] The display substrates shown in Figures 4A, 4B, and 5 differ from the display substrate shown in Figure 2 in that the pixel defining portion 230 between adjacent sub-pixels also includes a recessed portion 240; the display substrates shown in Figures 4A and 4B differ in the relative positional relationship between the recessed portion 240 and the first electrode 110; and the display substrates shown in Figures 4A and 5 differ in the number of recessed portions 240. The structural features of the display substrates shown in Figures 4A, 4B, and 5, excluding the recessed portion 240, can be the same as the corresponding structures in the display substrate shown in Figure 2, or the same as the corresponding structures in the display substrate shown in Figure 3, and will not be described further here.

[0110] In some examples, as shown in FIG4A, at least one recess 240 is provided on the surface of the pixel defining portion 230 between adjacent sub-pixels away from the substrate 01. The depth of the recess 240 is not less than the thickness of the light-emitting functional layer 130, and the distance between the bottom 241 of the recess 240 and the substrate 01 is greater than the distance between the surface of the first electrode 110 away from the substrate 01 and the substrate 01.

[0111] By providing a recessed portion 240 in the pixel limiting portion 230 between adjacent sub-pixels, it is beneficial to extend the crosstalk path of the light-emitting functional layer 130, thereby alleviating the sub-pixel ghosting problem and reducing crosstalk between adjacent sub-pixels.

[0112] Figure 4A schematically shows that the bottom 241 of the recess 240 is a plane, and the depth of the recess 240 is the distance between the bottom 241 and the edge of the recessed opening of the recess 240; however, it is not limited to this. If the bottom 241 of the recess 240 is a curved surface, the depth of the recess 240 can refer to the maximum depth or average depth of the recess 240. The thickness of the light-emitting functional layer 130 can refer to the thickness of the portion of the light-emitting functional layer 130 located between the edge of the recess 240 and the first opening 210. By setting the depth of the recess 240 to be greater than the thickness of the light-emitting functional layer 130, the light-emitting functional layer 130 can be recessed on the surface of the recess 240, which can extend the path.

[0113] In some examples, as shown in FIG4A, each recess 240 in at least one recess 240 has a cross-section cut by a plane parallel to the arrangement direction of adjacent sub-pixels and perpendicular to the substrate 01, including two side edges 242 and a bottom edge 2410. Along the direction of the insulating layer 400 away from the substrate 01, the distance between the two side edges 242 gradually increases, and the angle α at the connection between at least one side edge 242 and the bottom edge 2410 is 100 to 110 degrees.

[0114] For example, as shown in FIG4A, the light-emitting functional layer 130 is broken in the recess 240, and the second electrode 120 is continuously disposed at the edge of the recess 240.

[0115] By setting the depth of the recess 240 and the tilt angle of the side 242, the second electrode 120 can be continuously set at the edge of the recess 240.

[0116] The aforementioned "arrangement direction of adjacent sub-pixels" can be the X direction shown in Figure 4A, but is not limited to it; it can also be the Y direction shown in Figure 1, or the arrangement direction of sub-pixels arranged in other directions. The aforementioned "plane parallel to the arrangement direction of adjacent sub-pixels and perpendicular to the substrate 01" can be the XZ plane. The aforementioned "direction of the insulating layer 400 away from the substrate 01" is perpendicular to the substrate 01 and is the direction from the substrate 01 to the insulating layer 400, such as the Z direction. For example, in the direction away from the substrate 01, the two oppositely disposed sides 242 of the recess 240 are inclined in a direction away from each other. For example, angle α is the angle between the sidewall of the recess 240 and the surface of the bottom 241.

[0117] For example, as shown in Figure 4A, angle α is 100 degrees or 110 degrees. For example, angle α is 103 to 107 degrees. For example, angle α is 105 to 109 degrees. For example, angle α is 102 to 106 degrees. The specific values ​​of angle α in this embodiment are not listed individually, and can be any value between 100 and 110 degrees.

[0118] Figure 4A schematically shows that the side 242 and bottom 2410 of the cross section of the recess 240 are both straight lines, and the angle α is the included angle at the connection of the two straight lines. However, it is not limited to this. At least one of the side 242 and bottom 2410 can be a curve, and the angle α can be the chamfer at the connection between the side 242 and the bottom 2410.

[0119] For example, in other examples, both the light-emitting functional layer and the second electrode are disconnected in the recess; or a portion of the film layer of the light-emitting functional layer is disconnected in the recess, and the second electrode is continuously disposed in the recess.

[0120] In some examples, as shown in FIG4A, the thickness of the portion of the light-emitting functional layer 130 on the sidewall 2420 of at least one recess 240 is less than the thickness of the portion of the light-emitting functional layer 130 within the first opening 210.

[0121] By providing a recessed portion 240 in the pixel limiting portion 230, the thickness of the light-emitting functional layer 130 at the sidewall of the recessed portion 240 can be reduced, thereby increasing the resistance of the charge generation layer 133 and extending the crosstalk path of the charge generation layer 133, which is beneficial to reducing crosstalk between adjacent sub-pixels.

[0122] For example, as shown in FIG4A, the thickness of the portion of the second electrode 120 on the sidewall 2420 is less than the thickness of the portion of the second electrode 120 inside the first opening 210.

[0123] In some examples, as shown in FIG4A, the orthographic projection of the bottom 241 of the recess 240 on the substrate 01 does not overlap with the orthographic projection of the first electrode 110 on the substrate 01.

[0124] By setting the relative positional relationship between the recessed portion 240 and the first electrode 110, the recessed portion 240 can reduce crosstalk between adjacent sub-pixels while avoiding the position of the recessed portion 240 affecting the performance of the first electrode 110.

[0125] For example, as shown in FIG4A, the orthographic projection of the sidewall 2420 of the recess 240 on the substrate 01 and the orthographic projection of the first electrode 110 on the substrate 01 may or may not overlap.

[0126] For example, as shown in FIG4A, along a direction perpendicular to the substrate 01, the recess 240 overlaps with the first isolation portion 310, and the second electrode 120 extends its path or disconnects at the edge of the recess 240. By configuring the recess 240 to overlap with the first isolation portion 310 while simultaneously extending the path of the second electrode or disconnecting the second electrode, it is beneficial to alleviate the ghosting problem of the first sub-pixel 101 caused by the electrical connection between the second electrode 120 on the first protrusion 301 and the charge generation layer 133.

[0127] For example, in other examples, along the direction perpendicular to the substrate 01, the recess 240 overlaps only with the first isolation portion 310, and the recess 240 does not overlap with the second isolation portion 320. Furthermore, the distance between the edge of the first protrusion 301 and the second sub-opening 212 is less than the distance between the edge of the first protrusion 301 and the first sub-opening 211. This can extend the path of the light-emitting functional layer 130 while reducing the capacitance between the charge generation layer 133 and the second electrode 120 in the second sub-pixel 102, thereby alleviating the ghosting phenomenon of the second sub-pixel 102.

[0128] For example, in other examples, along a direction perpendicular to the substrate 01, the recess 240 overlaps only with the second isolation portion 320, and the recess 240 does not overlap with the first isolation portion 310.

[0129] For example, the cross-section of the recess 240 shown in FIG4A can be the cross-section of a strip-shaped recess 240 extending in a direction perpendicular to the XZ plane (refer to the planar shape of the recess shown in FIG11), or it can be the cross-section of one of a plurality of recesses 240 arranged in a direction perpendicular to the XZ plane.

[0130] In some examples, as shown in FIG4B, the bottom 241 of the recess 240 overlaps with the first electrode 110 along a direction perpendicular to the substrate 01, and the distance between the bottom 241 of the recess 240 and the first electrode 110 is greater than 2000 angstroms.

[0131] When the recess 240 overlaps with the first electrode 110, by limiting the distance between the bottom 241 of the recess 240 and the first electrode 110, the recess 240 can be prevented from affecting the characteristics of the first electrode 110.

[0132] For example, as shown in Figure 4B, the distance between the bottom 241 of the recess 240 and the first electrode 110 is greater than 3000 angstroms or greater than 5000 angstroms. While the depth of the recess 240 is greater than the thickness of the light-emitting functional layer 130, the distance between the bottom 241 of the recess 240 and the first electrode 110 can be any value greater than 2000 angstroms. Specific values ​​for this angle will not be listed in detail in this embodiment.

[0133] In some examples, as shown in FIG5, at least one recess 240 includes a plurality of recesses 240, and recesses 240 are provided on both sides of the first protrusion 301 located between adjacent sub-pixels along the arrangement direction of adjacent sub-pixels.

[0134] By providing recesses 240 on both sides of the first protrusion 301, it is beneficial to further extend the crosstalk path of the light-emitting functional layer 130 and reduce crosstalk between adjacent sub-pixels.

[0135] For example, as shown in FIG5, the pixel defining portion 230 located between the first protrusion 301 and the first sub-opening 211 may include at least one recessed portion 240, and the pixel defining portion 230 located between the first protrusion 301 and the second sub-opening 212 may include at least one recessed portion 240.

[0136] For example, the cross-section of each recess 240 shown in FIG5 can be the cross-section of a strip-shaped recess 240 extending in a direction perpendicular to the XZ plane, or it can include the cross-section of one of a plurality of recesses 240 arranged in a direction perpendicular to the XZ plane.

[0137] For example, as shown in FIG5, the plurality of recesses 240 include recesses 240 overlapping with the first isolation portion 310 and recesses 240 overlapping with the second isolation portion 320. For example, the shapes of the different recesses 240 may be the same or different.

[0138] Figure 6 is a partial planar structural schematic diagram of a display substrate provided according to another embodiment of the present disclosure. Figure 7 is a partial cross-sectional structural schematic diagram taken along line BB' shown in Figure 6.

[0139] As shown in Figures 6 and 7, the display substrate includes a substrate 01, a plurality of sub-pixels 100 located on the substrate 01, a pixel defining pattern 200, an isolation layer 300, and an insulating layer 400. At least some of the sub-pixels 100 include a first electrode 110, a light-emitting functional layer 130, and a second electrode 120 stacked on top of each other. The first electrode 110 is located between the light-emitting functional layer 130 and the substrate 01. The light-emitting functional layer 130 includes multiple film layers. For example, the display substrate includes a display area and a peripheral area surrounding the display area. The plurality of sub-pixels are located in the display area of ​​the display substrate. The pixel defining pattern 200 may include portions located in the display area and portions located in the peripheral area. The isolation layer 300 may include portions located in the display area and portions located in the peripheral area. The insulating layer 400 may include portions located in the display area and portions located in the peripheral area.

[0140] For example, the first electrode 110, the light-emitting functional layer 130, and the second electrode 120 of the sub-pixel 100 in the embodiments shown in FIG. 6 and FIG. 7 may have the same features as the corresponding structures of the sub-pixels in the embodiments shown in FIG. 1 and FIG. 2, and will not be described again here.

[0141] As shown in Figures 6 and 7, the pixel defining pattern 200 is located on the side of the first electrode 110 away from the substrate 01. The pixel defining pattern 200 includes a plurality of first openings 210, a plurality of second openings 220, and a pixel defining portion 230 surrounding the plurality of first openings 210 and the plurality of second openings 220. The plurality of first openings 210 are configured to expose the first electrodes 110 of the plurality of sub-pixels 100. For example, the second openings 220 are located in the display area. The first openings 210 of the pixel defining pattern 200 in this embodiment have the same features as the first openings 210 in the embodiments shown in Figures 1 and 2, and will not be described again here.

[0142] As shown in Figures 6 and 7, the isolation layer 300 is located between the first electrode 110 and the substrate 01, and the insulating layer 400 is located between the isolation layer 300 and the substrate 01. The insulating layer 400 includes a groove 410 located between adjacent sub-pixels 100, and the adjacent sub-pixels 100 include a first sub-pixel 101 and a second sub-pixel 102. The isolation layer 300 includes a first isolation portion 310 and a second isolation portion 320. The first isolation portion 310 overlaps with the first electrode 110 of the first sub-pixel 101, and the second isolation portion 320 overlaps with the first electrode 110 of the second sub-pixel 102. The first isolation portion 310 includes a first protrusion 301 protruding relative to the edge of the groove opening of the groove 410, and the second isolation portion 320 includes a second protrusion 302 protruding relative to the edge of the groove opening. Both the first protrusion 301 and the second protrusion 302 are configured to block at least one layer of the light-emitting functional layer 130.

[0143] In some examples, as shown in FIG7, both the first protrusion 301 and the second protrusion 302 are exposed by the second opening 220 to block the light-emitting functional layer 130 and the second electrode 120. For example, the charge-generating layer 133 on the first protrusion 301 overlaps with the second electrode 120, and the charge-generating layer 133 on the second protrusion 302 overlaps with the second electrode 120.

[0144] For example, as shown in FIG7, the first protrusion 301 and the second protrusion 302 protrude toward each other relative to the edge of the groove 410. For example, the distance between the first protrusion 301 and the second protrusion 302 is less than the distance between the two edges of the groove 410.

[0145] The aforementioned adjacent sub-pixels can be any adjacent sub-pixels, not limited to two sub-pixels adjacent in the X direction, but also two sub-pixels adjacent in the Y direction. For example, the aforementioned adjacent sub-pixels can refer to two adjacent sub-pixels that emit different colors of light, but are not limited to two fixed colors of sub-pixels. As such, the aforementioned adjacent sub-pixels can include a variety of cases, such as blue sub-pixels and green sub-pixels, red sub-pixels and green sub-pixels.

[0146] For example, as shown in Figure 7, the depth of the groove 410 is greater than the thickness of the light-emitting functional layer and less than the maximum thickness of the insulating layer. The angle between the side surface and the bottom surface of the groove 410 is greater than 90 degrees. The size of the first protrusion 301 is greater than 0.01 micrometers and less than the thickness of the light-emitting functional layer. The size of the second protrusion 302 is greater than 0.01 micrometers and less than the thickness of the light-emitting functional layer.

[0147] As shown in Figure 7, the second opening 220 exposes at least a portion of the groove 410. Along the arrangement direction of adjacent sub-pixels, the size of at least one of the first isolation portion 310 and the second isolation portion 320 exposed by the second opening 220 is smaller than the distance D32 between the first protrusion 301 and the second protrusion 302.

[0148] By setting both protrusions as blocking the light-emitting functional layer 130, and setting the distance between the two protrusions to be greater than the size at least one of the first isolation portion 310 and the second isolation portion 320 exposed by the second opening 220, it is possible to reduce crosstalk between the first sub-pixel 101 and the second sub-pixel 102, while setting at least one of the distances between the first protrusion 301 and the light-emitting area of ​​the first sub-pixel 101 and the second protrusion 302 and the light-emitting area of ​​the second sub-pixel 102 to be smaller, so as to reduce the capacitance between the second electrode 120 and the charge generation layer 133 in at least one of the first sub-pixel 101 and the second sub-pixel 102, which is beneficial to reduce the ghosting phenomenon generated by at least one of the first sub-pixel 101 and the second sub-pixel 102.

[0149] For example, as shown in Figure 7, both the first isolation section 310 and the second isolation section 320 are exposed by the second opening 220.

[0150] In some examples, as shown in Figure 7, along the arrangement direction of adjacent sub-pixels, the dimensions D31 of the first isolation portion 310 exposed by the second opening 220 and the dimensions D33 of the second isolation portion 320 exposed by the second opening 220 are both smaller than the distance D32 between the first protrusion 301 and the second protrusion 302. This helps to reduce the capacitance between the second electrode 120 and the charge generation layer 133 in the first sub-pixel 101 and the second electrode 120 and the charge generation layer 133 in the second sub-pixel 102, thereby simultaneously reducing the ghosting phenomenon generated by the first sub-pixel 101 and the second sub-pixel 102.

[0151] For example, as shown in Figure 7, both D31 and D33 are greater than 0. However, this is not the only possibility; at least one of D31 and D33 can be equal to 0, that is, the edge of at least one of the first protrusion 301 and the second protrusion 302 is flush with the edge of the pixel defining portion 230.

[0152] For example, as shown in Figure 7, the groove 410 is completely exposed by the second opening 220.

[0153] For example, as shown in Figure 7, when the distance between the light-emitting area of ​​the first sub-pixel 101 and the light-emitting area of ​​the second sub-pixel 102 is 20 micrometers, the distance D32 between the first protrusion 301 and the second protrusion 302 can be 3.5 micrometers; the size D31 of the first isolation portion 310 exposed by the second opening 220 and the size D33 of the second isolation portion 320 exposed by the second opening 220 can be equal, such as both being 1.75 micrometers, but it is not limited to this, and the two can also be unequal.

[0154] For example, as shown in Figure 7, the material of the isolation layer 300 includes inorganic non-metallic materials, the material of the insulating layer 400 includes organic materials, the two side surfaces of the isolation layer 300 are in contact with the first electrode 110 and the insulating layer 400 respectively, and the orthographic projection of the first electrode 110 on the substrate 01 is completely located within the orthographic projection of the isolation layer 300 on the substrate 01.

[0155] For example, as shown in Figure 7, the material of the insulating layer 300 may include silicon nitride or silicon oxide. For example, the insulating layer 400 may be a planarization layer, and the material of the insulating layer 400 may include materials such as polyimide.

[0156] For example, as shown in FIG7, after forming an insulating layer 400 on a substrate 01, an isolation layer 300 can be formed, and the isolation layer 300 can be etched with an etchant to form a first isolation portion 310, a second isolation portion 320, and a groove 410. Since the etching selectivity of the etchant for the material of the insulating layer 400 is greater than that for the material of the isolation layer 300, the edge of the groove 410 formed after etching is recessed relative to the isolation layer 300, such as the edges of the first isolation portion 310 and the second isolation portion 320. By setting the first electrode 110 so that its orthographic projection is completely within the orthographic projection of the isolation layer 300, the flatness of the first electrode 110 is improved.

[0157] The substrate 01 and film layer 02 in the embodiment shown in Figure 7 can have the same features as the substrate 01 and film layer 02 in the embodiment shown in Figure 2, and will not be described again here. Figure 7 only shows the film layer between the second electrode 120 and the substrate 01. For example, a spacer, encapsulation layer or other structure can also be provided on the side of the second electrode 120 away from the substrate 01.

[0158] In some examples, as shown in FIG7, the adjacent first opening 210 configured to define the light-emitting area of ​​adjacent sub-pixels includes a first sub-opening 211 and a second sub-opening 212. The first sub-opening 211 is configured to define the light-emitting area of ​​the first sub-pixel 101, and the second sub-opening 212 is configured to define the light-emitting area of ​​the second sub-pixel 102. The ratio of the distance D34 between the first sub-opening 211 and the edge of the first protrusion 301 to the distance D35 between the second sub-opening 212 and the edge of the second protrusion 302 is 0.95 to 1.05 to balance crosstalk between two adjacent sub-pixels.

[0159] For example, as shown in Figure 7, the ratio of distance D34 to distance D35 is 1.

[0160] For example, as shown in Figure 7, when the distance between the light-emitting area of ​​the first sub-pixel 101 and the light-emitting area of ​​the second sub-pixel 102 is 20 micrometers, the distances D34 and D35 can be the same, such as 8.25 micrometers, but are not limited to this, and can also be different.

[0161] In some examples, as shown in Figure 6, the first sub-pixel 101 and the second sub-pixel 102 are two different colored sub-pixels selected from blue, green, and red. For example, one of the first sub-pixel 101 and the second sub-pixel 102 is a blue sub-pixel, and the other is a green sub-pixel. For example, one of the first sub-pixel 101 and the second sub-pixel 102 is a red sub-pixel, and the other is a green sub-pixel.

[0162] For example, as shown in FIG6, the second opening 220 between adjacent sub-pixels arranged along the X direction and along the Y direction exposes the protrusions on both sides, so that the light-emitting functional layer 130 and the second electrode 120 within the second opening 220 are separated twice. For example, the opposite side edges in the isolation portion overlapping with the first electrode 110 of the same sub-pixel in the X direction and the opposite side edges in the Y direction are both exposed by the second opening 220.

[0163] Compared to the situation where the second opening 220 only exposes the edge of the isolation portion overlapping with the first electrode 110 of the red and green sub-pixels, resulting in severe ghosting of the red and green sub-pixels, the second opening 220 in the display substrate provided in this embodiment exposes the isolation portions corresponding to the adjacent green and blue sub-pixels as well as the isolation portions corresponding to the adjacent red and green sub-pixels. Furthermore, the distance between the edge of the protrusion that protrudes relative to the edge of the groove in each isolation portion and the light-emitting area of ​​the corresponding sub-pixel is small. This helps to reduce crosstalk between adjacent sub-pixels while balancing the display effect of different color sub-pixels and improving image quality.

[0164] For example, as shown in Figure 6, the extending direction of the second opening 220 located between adjacent sub-pixels intersects the arrangement direction of the adjacent sub-pixels. For example, the dimension of the second opening 220 perpendicular to its extending direction and parallel to the substrate is called its width, and different second openings 220 may have the same width. However, it is not limited to this, and different second openings 220 may also have different widths.

[0165] For example, Figure 6 schematically shows four second openings 220 spaced apart around the same sub-pixel, but is not limited thereto. At least two of the second openings 220 can be connected second openings 220, as long as the second opening 220 does not expose the first electrode 110 of the sub-pixel.

[0166] For example, as shown in Figure 6, the planar shape of the second opening is strip-shaped, the length of the gap between the first and second isolation portions is greater than the length of the strip, and the width of the gap is less than the width of the strip. For example, a portion of the orthographic projection of the gap on the substrate does not overlap with the orthographic projection of the second opening on the substrate.

[0167] Figures 8 and 9 are schematic diagrams of partial cross-sectional structures of display substrates provided according to different examples of embodiments of the present disclosure.

[0168] The difference between the display substrate in the example shown in Figure 8 and the display substrate in the example shown in Figure 7 is that the distance between the edge of the first sub-opening 211 and the first protrusion 301 is greater than the distance between the edge of the second sub-opening 212 and the second protrusion 302. The difference between the display substrate in the example shown in Figure 9 and the display substrate in the example shown in Figure 7 is that the pixel limiting portion 230 between adjacent sub-pixels also includes a recessed portion 240.

[0169] In some examples, as shown in FIG8, the luminous efficiency of the first sub-pixel 101 is less than that of the second sub-pixel 102. The adjacent first opening 210 configured to define the luminous area of ​​the adjacent sub-pixel includes a first sub-opening 211 and a second sub-opening 212. The first sub-opening 211 is configured to define the luminous area of ​​the first sub-pixel 101, and the second sub-opening 212 is configured to define the luminous area of ​​the second sub-pixel 102. The distance D34 between the first sub-opening 211 and the edge of the first protrusion 301 is greater than the distance D35 between the second sub-opening 212 and the edge of the second protrusion 302.

[0170] By reducing the distance between the second protrusion 302 and the light-emitting area of ​​the second sub-pixel 102 with higher luminous efficiency, it is beneficial to reduce the overlap area between the charge generation layer 133 of the second sub-pixel 102 and the second electrode 120, reduce the capacitance between the two, and further improve the ghosting phenomenon generated by the second sub-pixel 102.

[0171] For example, as shown in Figure 8, the ratio of distance D34 to distance D35 is 1 to 2.

[0172] In some examples, the first sub-pixel 101 includes a blue sub-pixel and the second sub-pixel 102 includes a green sub-pixel. However, it is not limited to this; the first sub-pixel 101 can also be a red sub-pixel and the second sub-pixel 102 can be a green sub-pixel, or the first sub-pixel 101 can be a blue sub-pixel and the second sub-pixel 102 can be a red sub-pixel.

[0173] For example, as shown in FIG9, at least one recessed portion 240 is provided on the surface of the pixel limiting portion 230 between adjacent sub-pixels away from the substrate 01. The depth of the recessed portion 240 is not less than the thickness of the light-emitting functional layer 130, and the distance between the bottom 241 of the recessed portion 240 and the substrate 01 is greater than the distance between the surface of the first electrode 110 away from the substrate 01 and the substrate 01.

[0174] By providing a recessed portion 240 in the pixel limiting portion 230 between adjacent sub-pixels, it is beneficial to extend the crosstalk path of the light-emitting functional layer 130, thereby alleviating the sub-pixel ghosting problem and reducing crosstalk between adjacent sub-pixels.

[0175] The recessed portion 240 provided in the display substrate shown in FIG9 can have the same features as the recessed portion 240 provided in the display substrates shown in FIG4A to FIG5, and will not be described again here.

[0176] Figure 10 is a partial planar structural schematic diagram of a display substrate according to another example of an embodiment of the present disclosure. Figure 10 schematically shows that the relative positional distribution of the second opening 220, the isolation layer 300, and the groove 410 in the display substrate is the same as that in the display substrate shown in Figure 6. However, it is not limited to this. The relative positional distribution of the second opening 220, the isolation layer 300, and the groove 410 in the display substrate shown in Figure 10 can also be the same as that in the display substrate shown in Figure 1. The embodiments of the present disclosure do not limit this.

[0177] In some examples, as shown in FIG10, the display substrate further includes a spacer 500 located on the side of the pixel limiting portion 230 away from the substrate 01, wherein the orthographic projection of the spacer 500 on the substrate 01 does not overlap with the orthographic projection of the groove 410 on the substrate 01.

[0178] By setting the second opening 220 to expose the isolation portion that overlaps with the sub-pixels on both sides, and setting the spacer 500 to not overlap with the groove 410, crosstalk between adjacent sub-pixels can be reduced while avoiding the position of the groove 410 affecting the performance of the spacer 500.

[0179] For example, in other examples, the orthographic projection of the spacer on the substrate does not overlap with the orthographic projection of the recess on the substrate. For example, the spacer may be integrally formed with the pixel defining portion.

[0180] For example, as shown in Figure 10, spacer 500 is used to support fine metal mask (FMM), such as spacer 500 supporting fine metal mask for patterning to form light-emitting layer.

[0181] For example, as shown in Figure 10, the same spacer 500 is surrounded by four second openings 220.

[0182] For example, as shown in Figure 10, the multiple sub-pixels include multiple blue sub-pixels 1011, multiple green sub-pixels 1012, and multiple red sub-pixels 1013. The red sub-pixels 1013 and blue sub-pixels 1011 are arranged alternately along the U and V directions, and the green sub-pixels 1012 are arranged in an array along the U and V directions.

[0183] For example, as shown in Figure 10, multiple spacers 500 are arranged in an array along the X and Y directions, and three second openings 220 are provided between two adjacent spacers 500.

[0184] The pixel arrangement in each embodiment described in this disclosure can be the same as the pixel arrangement shown in FIG10.

[0185] As shown in Figure 10, the isolation layer 300 includes isolation portions that overlap with different sub-pixels. These portions can be an integrated structure, but are not limited to this. At least two isolation portions can be spaced apart.

[0186] Figure 11 is a partial planar structural schematic diagram of a display substrate provided according to another embodiment of the present disclosure. Figure 12 is a partial cross-sectional structural schematic diagram taken along line CC' shown in Figure 11.

[0187] As shown in Figures 11 and 12, the display substrate includes a substrate 01, a plurality of sub-pixels 100 located on the substrate 01, a pixel defining pattern 200, and an insulating layer 400. At least some of the sub-pixels 100 include a first electrode 110, a light-emitting functional layer 130, and a second electrode 120 stacked together. The first electrode 110 is located between the light-emitting functional layer 130 and the substrate 01. The light-emitting functional layer 130 includes multiple film layers. For example, the display substrate includes a display area and a peripheral area surrounding the display area. The plurality of sub-pixels are located in the display area of ​​the display substrate. The pixel defining pattern 200 may include portions located in the display area and portions located in the peripheral area. The insulating layer 300 may include portions located in the display area and portions located in the peripheral area. The insulating layer 400 may include portions located in the display area and portions located in the peripheral area.

[0188] For example, the first electrode 110, the light-emitting functional layer 130, and the second electrode 120 of the sub-pixel in the embodiments shown in Figures 11 and 12 may have the same features as the corresponding structures of the sub-pixels in the embodiments shown in Figures 1 and 2, and will not be described again here.

[0189] As shown in Figures 11 and 12, the pixel defining pattern 200 is located on the side of the first electrode 110 away from the substrate 01. The pixel defining pattern 200 includes a plurality of first openings 210, a plurality of second openings 220, and a pixel defining portion 230 surrounding the plurality of first openings 210 and the plurality of second openings 220. The plurality of first openings 210 are configured to expose the first electrodes 110 of a plurality of sub-pixels 100. For example, the second openings 220 are located in the display area. The first openings 210 of the pixel defining pattern 200 in this embodiment have the same features as the first openings 210 in the embodiments shown in Figures 1 and 2, and will not be described again here.

[0190] As shown in Figures 11 and 12, the insulating layer 400 is located between the first electrode 110 and the substrate 01. At least one recess 240 is provided on the surface of the pixel defining portion 230 between adjacent sub-pixels 100 on the side away from the substrate 01. The depth of the recess 240 is not less than the thickness of the light-emitting functional layer 130, and the distance between the bottom 241 of the recess 240 and the substrate 01 is greater than the distance between the surface of the first electrode 110 away from the substrate 01 and the substrate 01. Each recess 240, when cut by a plane parallel to the arrangement direction of adjacent sub-pixels and perpendicular to the substrate 01, includes two side edges 242 and a bottom edge 2410. Along the direction of the insulating layer 400 away from the substrate 01, the distance between the two side edges 242 gradually increases, and the angle α at the connection point of at least one side edge 242 and the bottom edge 2410 is 100 to 110 degrees.

[0191] The aforementioned "arrangement direction of adjacent sub-pixels" can be the X direction shown in Figure 11, but is not limited to it; it can also be the Y direction shown in Figure 1, or the arrangement direction of sub-pixels arranged in other directions. The aforementioned "plane parallel to the arrangement direction of adjacent sub-pixels and perpendicular to the substrate 01" can be the XZ plane. The aforementioned "direction of the insulating layer 400 away from the substrate 01" is perpendicular to the substrate 01 and is the direction from the substrate 01 to the insulating layer 400, such as the Z direction. For example, in the direction away from the substrate 01, the two oppositely disposed sides 242 of the recess 240 are inclined in a direction away from each other. For example, angle α is the angle between the sidewall of the recess 240 and the surface of the bottom 241.

[0192] For example, as shown in FIG12, the light-emitting functional layer 130 is interrupted in the recess 240, and the second electrode 120 is continuously disposed in the recess 240. By setting the depth of the recess 240 and the tilt angle of the side 242, the second electrode 120 can be continuously disposed in the recess 240. For example, in other examples, both the light-emitting functional layer 130 and the second electrode 120 are interrupted in the recess 240, or a portion of the film layer of the light-emitting functional layer 130 is interrupted in the recess 240, and the second electrode 120 is continuously disposed in the recess 240.

[0193] As shown in Figure 12, the insulating layer 400 includes a groove 410 located between adjacent sub-pixels, and a second opening 220 exposes at least a portion of the groove 410.

[0194] By providing a groove 410 exposed by the second opening 220 in the insulating layer 400 and a recess 240 in the pixel limiting portion 230, it is beneficial to extend the path of the light-emitting functional layer 130 and reduce crosstalk between adjacent sub-pixels.

[0195] For example, as shown in Figure 12, the depth of the groove 410 can be the same as the depth of the groove 410 in the above embodiment, which will not be repeated here.

[0196] For example, as shown in Figure 12, the angle α is 100 degrees or 110 degrees. For example, the angle α is 103 to 107 degrees. For example, the angle α is 105 to 109 degrees. For example, the angle α is 102 to 106 degrees. The specific values ​​of the angle α in this embodiment are not listed individually, and it can be any value between 100 and 110 degrees. Figure 11 schematically shows that the side edge 242 and the bottom edge 2410 of the cross-section of the recessed portion 240 are both straight lines, and the angle α is the included angle at the connection of the two straight lines. However, it is not limited to this; at least one of the side edge 242 and the bottom edge 2410 can be a curve, and the angle α can be the chamfer at the connection between the side edge 242 and the bottom edge 2410.

[0197] For example, as shown in Figure 12, the light-emitting functional layer 130 in the second opening 220 is disconnected, the second electrode 120 is continuously arranged, and the thickness of the second electrode 120 located on the side wall of the second opening 220 is less than the thickness of the second electrode 120 located in the first opening 210.

[0198] However, it is not limited to this. The tilt angle of the sidewall of the pixel limiting part 230 forming the second opening 220 and the depth of the groove 410 in the insulating layer 400 can be adjusted to isolate the light-emitting functional layer 130 and the second electrode 120.

[0199] In some examples, as shown in FIG12, the thickness of the portion of the light-emitting functional layer 130 on the sidewall 2420 of at least one recess 240 is less than the thickness of the portion of the light-emitting functional layer 130 within the first opening 210.

[0200] By providing a recessed portion 240 in the pixel limiting portion 230, the thickness of the light-emitting functional layer 130 at the sidewall of the recessed portion 240 can be reduced, thereby increasing the resistance of the charge generation layer 133 and extending the crosstalk path of the charge generation layer 133, which is beneficial to reducing crosstalk between adjacent sub-pixels.

[0201] For example, as shown in FIG12, the thickness of the portion of the second electrode 120 on the sidewall 2420 is less than the thickness of the portion of the second electrode 120 inside the first opening 210.

[0202] In some examples, as shown in FIG12, the orthographic projection of the bottom 241 of the recess 240 on the substrate 01 does not overlap with the orthographic projection of the first electrode 110 on the substrate 01.

[0203] By setting the relative positional relationship between the recessed portion 240 and the first electrode 110, the recessed portion 240 can reduce crosstalk between adjacent sub-pixels while avoiding the position of the recessed portion 240 affecting the performance of the first electrode 110.

[0204] For example, as shown in FIG12, the orthographic projection of the sidewall 2420 of the recess 240 on the substrate 01 and the orthographic projection of the first electrode 110 on the substrate 01 may or may not overlap.

[0205] For example, as shown in Figure 12, the cross-section of the recess 240 can be the cross-section of a strip-shaped recess 240 extending in a direction perpendicular to the XZ plane, or it can be the cross-section of one of a plurality of recesses 240 arranged in a direction perpendicular to the XZ plane.

[0206] For example, as shown in Figure 12, the second opening 220 exposes a portion of the groove 410.

[0207] In some examples, as shown in FIG12, along the arrangement direction of adjacent sub-pixels, the groove 410 includes a first edge 411 and a second edge 412 disposed opposite to each other, and the pixel defining portion 230 covers the first edge 411 and the second edge 412. The pixel defining portion covering the first edge and the second edge is beneficial to increasing the height of the pixel defining portion at the second opening, making it easier for the light-emitting functional layer to be disconnected on the pixel defining portion surrounding the second opening.

[0208] In some examples, as shown in Figure 12, the first electrode 110 is in contact with the insulating layer 400, which is made of an organic material.

[0209] For example, the insulating layer 400 can be a planarization layer, and the material of the insulating layer 400 can include materials such as polyimide.

[0210] By setting the first electrode 110 to be in direct contact with the insulating layer 400, it is beneficial to improve the flatness of the first electrode 110.

[0211] Figures 13 to 15 are schematic partial cross-sectional views of display substrates provided according to different embodiments of the present disclosure. The difference between the display substrates shown in Figure 13 and Figure 12 lies in the relative positional relationship between the recessed portion 240 and the first electrode 110. The difference between the display substrates shown in Figure 14 and Figure 12 lies in the number of recessed portions 240. The difference between the display substrates shown in Figure 15 and Figure 12 lies in the portion of the groove 410 exposed by the second opening 220.

[0212] In some examples, as shown in FIG13, the bottom 241 of the recess 240 overlaps with the first electrode 110 along a direction perpendicular to the substrate 01, and the distance between the bottom 241 of the recess 240 and the first electrode 110 is greater than 2000 angstroms.

[0213] When the recess 240 overlaps with the first electrode 110, by limiting the distance between the bottom 241 of the recess 240 and the first electrode 110, the recess 240 can be prevented from affecting the characteristics of the first electrode 110.

[0214] For example, as shown in Figure 13, the distance between the bottom 241 of the recess 240 and the first electrode 110 is greater than 3000 angstroms or greater than 5000 angstroms. While the depth of the recess 240 is greater than the thickness of the light-emitting functional layer 130, the distance between the bottom 241 of the recess 240 and the first electrode 110 can be any value greater than 2000 angstroms. The specific values ​​of this angle in this embodiment will not be listed one by one.

[0215] In some examples, as shown in FIG14, at least one recess 240 includes a plurality of recesses 240, and recesses 240 are provided on both sides of the second opening 220 between adjacent sub-pixels along the arrangement direction of adjacent sub-pixels.

[0216] By providing recesses 240 on both sides of the second opening 220, it is beneficial to further extend the crosstalk path of the light-emitting functional layer 130 and reduce crosstalk between adjacent sub-pixels.

[0217] For example, as shown in FIG14, the pixel defining portion 230 located on one side of the second opening 220 may include at least one recessed portion 240, and the pixel defining portion 230 located on the other side of the second opening 220 may include at least one recessed portion 240.

[0218] For example, the cross-section of each recess 240 shown in FIG14 can be the cross-section of a strip-shaped recess 240 extending in a direction perpendicular to the XZ plane, or it can include the cross-section of one of a plurality of recesses 240 arranged in a direction perpendicular to the XZ plane.

[0219] In some examples, as shown in FIG15, along the arrangement direction of adjacent sub-pixels, the notch of the groove 410 includes a first edge 411 and a second edge 412 disposed opposite to each other, and the second opening 220 exposes at least one of the first edge 411 and the second edge 412.

[0220] By exposing at least one of the first edge 411 and the second edge 412 through the second opening 220, the path of the light-emitting functional layer 130 can be further extended to reduce crosstalk between adjacent sub-pixels. Furthermore, by setting the tilt angle of the sidewall of the groove 410, the edge of the groove 410 exposed by the second opening 220 can act as a barrier to the light-emitting functional layer 130, further reducing crosstalk between adjacent sub-pixels.

[0221] Figure 16 is a partial cross-sectional structural schematic diagram of a display substrate provided according to yet another example of a further embodiment of the present disclosure. The difference between the display substrate shown in Figure 16 and the display substrates shown in Figures 12 to 15 is that the display substrate further includes an isolation layer 300.

[0222] In some examples, as shown in Figure 16, the display substrate further includes an isolation layer 300 located between the first electrode 110 and the insulating layer 400. The two side surfaces of the isolation layer 300 are in contact with the first electrode 110 and the insulating layer 400, respectively. The material of the isolation layer 300 includes an inorganic non-metallic material, and the material of the insulating layer 400 includes an organic material. Adjacent sub-pixels include a first sub-pixel 101 and a second sub-pixel 102. The luminous efficiency of the first sub-pixel 101 is less than that of the second sub-pixel 102. The isolation layer 300 includes a first isolation portion 310 and a second isolation portion 320. The first isolation portion 310 overlaps with the first electrode 110 of the first sub-pixel 101, and the second isolation portion 320 overlaps with the first electrode 110 of the second sub-pixel 102.

[0223] For example, as shown in FIG16, the orthographic projection of the first electrode 110 on the substrate 01 is completely within the orthographic projection of the isolation layer 300 on the substrate 01.

[0224] For example, as shown in Figure 16, the material of the isolation layer 300 may include silicon nitride or silicon oxide. For example, the insulating layer 400 may be a planarization layer, and its material may include materials such as polyimide. For example, after forming the insulating layer 400 on the substrate 01, the isolation layer 300 may be formed, and the isolation layer 300 may be etched using an etchant to form a first isolation portion 310, a second isolation portion 320, and a groove 410. Because the etching selectivity of the etchant for the material of the insulating layer 400 is greater than that for the material of the isolation layer 300, the edges of the groove 410 formed after etching are recessed relative to the isolation layer 300, such as the edges of the first isolation portion 310 and the second isolation portion 320. By setting the first electrode 110 so that its orthographic projection is completely within the orthographic projection of the isolation layer 300, the planarity of the first electrode 110 is improved.

[0225] For example, as shown in Figure 16, the first sub-pixel 101 includes a blue sub-pixel, and the second sub-pixel 102 includes a green sub-pixel. However, it is not limited to this; the first sub-pixel 101 can also be a red sub-pixel, and the second sub-pixel 102 can be a green sub-pixel, or the first sub-pixel 101 can be a blue sub-pixel, and the second sub-pixel 102 can be a red sub-pixel.

[0226] In some examples, as shown in FIG16, the notch of the groove 410 includes a first edge 411 and a second edge 412 disposed opposite to each other. The first isolation portion 310 includes a first protrusion 301 protruding relative to the first edge 411, and the second isolation portion 320 includes a second protrusion 302 protruding relative to the second edge 412. The pixel defining portion 230 covers the first protrusion 301, and the second opening 220 exposes the second protrusion 302. For example, the second protrusion 302 is configured to block the light-emitting functional layer 130 and the second electrode 120.

[0227] By setting the positional relationship between the pixel limiting portion 230, the second opening 220, the first protrusion 301, and the second protrusion 302, and by providing a recess 240 on the pixel limiting portion 230, it is beneficial to extend the crosstalk path of the light-emitting functional layer 130 and improve the crosstalk problem between the first sub-pixel 101 and the second sub-pixel 102.

[0228] Figure 16 schematically shows a recessed portion on one side of the second opening, but it is not limited thereto; recessed portions may be provided on both sides of the second opening.

[0229] The other structures in the display substrate shown in Figure 16, except for the isolation layer, have the same characteristics as the corresponding structures in the display substrate shown in Figure 12, and will not be described again here.

[0230] Figure 17 is a schematic block diagram of a display device according to another embodiment of the present disclosure. As shown in Figure 17, a display device provided in an embodiment of the present disclosure includes any of the above-described display substrates.

[0231] For example, a display device may or may not have a color filter layer.

[0232] For example, the display device also includes a cover plate located on the light-emitting side of the display substrate.

[0233] For example, the display device can be an organic light-emitting diode display device or other display device, as well as any product or component with display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator that includes the display device. This embodiment is not limited to this.

[0234] The following points need to be explained:

[0235] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure, and other structures can be referred to the general design.

[0236] (2) Where there is no conflict, features of the same embodiment and different embodiments of this disclosure may be combined with each other.

[0237] The above description is merely an exemplary embodiment of this disclosure and is not intended to limit the scope of protection of this disclosure, which is determined by the appended claims.

Claims

1. A display substrate, comprising: a substrate substrate; a plurality of sub-pixels on the substrate substrate, each of at least some of the sub-pixels comprising a first electrode, a light-emitting functional layer, and a second electrode stacked, the first electrode being between the light-emitting functional layer and the substrate substrate, the light-emitting functional layer comprising a plurality of film layers; a pixel defining pattern on a side of the first electrode distal to the substrate substrate, the pixel defining pattern comprising a plurality of first openings, 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 being configured to expose the first electrodes of the plurality of sub-pixels; an isolation layer between the first electrode and the substrate substrate; an insulating layer between the isolation layer and the substrate substrate, wherein the insulating layer comprises a groove between adjacent sub-pixels, a groove mouth of the groove comprising a first edge exposed by the second openings, the isolation layer comprising a first protruding portion protruding relative to the first edge, the first protruding portion being configured to isolate at least one layer of the light-emitting functional layer; the adjacent sub-pixels comprising a first sub-pixel and a second sub-pixel, the first sub-pixel having a lower light-emitting efficiency than the second sub-pixel, the isolation layer comprising a first isolation portion overlapping the first electrode of the first sub-pixel and a second isolation portion overlapping the first electrode of the second sub-pixel, the first isolation portion comprising the first protruding portion; the groove mouth comprising a second edge, the second isolation portion comprising a second protruding portion protruding relative to the second edge, the pixel defining portion covering the second protruding portion and a portion of the groove. 2.The display substrate of claim 1, wherein, the light-emitting functional layer and the second electrode are both broken at an edge of the first protruding portion, the light-emitting functional layer comprising a charge generation layer, the charge generation layer and the second electrode being in contact at a side of the first protruding portion distal to the substrate substrate, the charge generation layer and the second electrode being spaced apart at a side of the first protruding portion proximal to the substrate substrate. 3.The display substrate of claim 1, wherein, the light-emitting functional layer and the second electrode are both broken at an edge of the first protruding portion, a ratio of a distance between an adjacent first opening configured to define a light-emitting area of the adjacent sub-pixels and the edge of the first protruding portion being 0.95-1.

05. 4.The display substrate of claim 1, wherein, the light-emitting functional layer and the second electrode are both broken at an edge of the first protruding portion, the adjacent first opening configured to define a light-emitting area of the adjacent sub-pixels comprising a first sub-opening and a second sub-opening, the first sub-opening being configured to define a light-emitting area of the first sub-pixel, the second sub-opening being configured to define a light-emitting area of the second sub-pixel, a distance between the first sub-opening and the edge of the first protruding portion being greater than a distance between the second sub-opening and the edge of the first protruding portion. 5.The display substrate of claim 3, wherein, The first sub-opening and the second sub-opening are located between the second opening and the first sub-opening and the second sub-opening, and the distance between the second opening and the first sub-opening and the distance between the second opening and the second sub-opening are respectively a first distance and a second distance, and the ratio of the first distance to the second distance is 0.95-1.

05. 6.The display substrate of claim 4, wherein, The distance between the second opening and the first sub-opening and the distance between the second opening and the second sub-opening are respectively a first distance and a second distance, and the ratio of the first distance to the second distance is 0.95-1.

05. 7.The display substrate of any one of claims 1-6, wherein, The first sub-pixel comprises a blue sub-pixel, and the second sub-pixel comprises a green sub-pixel.

8. A display substrate, comprising: a substrate substrate; a plurality of sub-pixels, located on the substrate substrate, each of at least part of the sub-pixels comprising a first electrode, a light-emitting functional layer and a second electrode arranged in a stack, the first electrode being located between the light-emitting functional layer and the substrate substrate, the light-emitting functional layer comprising a plurality of film layers; a pixel defining pattern, located on a side of the first electrode away from the substrate substrate, the pixel defining pattern comprising a plurality of first openings, 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 being configured to expose the first electrodes of the plurality of sub-pixels; an isolation layer, located between the first electrode and the substrate substrate; an insulating layer, located between the isolation layer and the substrate substrate, wherein the insulating layer comprises a groove located between adjacent sub-pixels, the adjacent sub-pixels comprising a first sub-pixel and a second sub-pixel, the isolation layer comprises a first isolation portion and a second isolation portion, the first isolation portion overlaps the first electrode of the first sub-pixel, and the second isolation portion overlaps the first electrode of the second sub-pixel, the first isolation portion comprises a first protruding portion protruding relative to an edge of a slot of the groove, the second isolation portion comprises a second protruding portion protruding relative to an edge of the slot, and the first protruding portion and the second protruding portion are both configured to block at least one layer of the light-emitting functional layer; the second opening exposes at least part of the groove, and along an arrangement direction of the adjacent sub-pixels, the size of at least one of the first isolation portion and the second isolation portion exposed by the second opening is smaller than the distance between the first protruding portion and the second protruding portion. 9.The display substrate of claim 8, wherein, The first protruding portion and the second protruding portion are both exposed by the second opening to block the light-emitting functional layer and the second electrode, and along the arrangement direction, the size of the first isolation portion and the second isolation portion exposed by the second opening is both smaller than the distance between the first protruding portion and the second protruding portion. 10.The display substrate of claim 8, wherein, The first sub-opening and the second sub-opening are configured to define light emitting areas of the first sub-pixel and the second sub-pixel respectively, and a distance between the first sub-opening and an edge of the first protruding part is greater than a distance between the second sub-opening and an edge of the second protruding part. 11.The display substrate of claim 8, wherein, The first sub-pixel and the second sub-pixel are two different color sub-pixels among a blue color sub-pixel, a green color sub-pixel and a red color sub-pixel. 12.The display substrate of claim 10, wherein, The first sub-pixel comprises a blue color sub-pixel, and the second sub-pixel comprises a green color sub-pixel. 13.The display substrate of claim 11, wherein, The material of the isolation layer comprises an inorganic non-metallic material, the material of the insulating layer comprises an organic material, two side surfaces of the isolation layer are in contact with the first electrode and the insulating layer respectively, and a normal projection of the first electrode on the substrate substrate is completely located in a normal projection of the isolation layer on the substrate substrate. 14.The display substrate of any one of claims 1-13, wherein, The pixel defining part between the adjacent sub-pixels is provided with at least one recessed part away from the substrate substrate, the depth of the recessed part is not less than the thickness of the light emitting functional layer, and the distance between the bottom of the recessed part and the substrate substrate is greater than the distance between the surface of the first electrode away from the substrate substrate and the substrate substrate. 15.The display substrate of any one of claims 1-14, wherein, The at least one recessed part comprises a plurality of recessed parts, and the recessed parts are arranged on both sides of the first protruding part between the adjacent sub-pixels along the arrangement direction of the adjacent sub-pixels. 16.The display substrate of claim 15, wherein, Each of the at least one recessed part is parallel to the arrangement direction of the adjacent sub-pixels and perpendicular to the plane of the substrate substrate, and the cross section of each of the at least one recessed part comprises two side edges and a bottom edge, the distance between the two side edges gradually increases in the direction of the insulating layer away from the substrate substrate, and the angle between at least one side edge and the bottom edge is 100-110 degrees.

17. The display substrate of claim 15 or 16, wherein, The thickness of the part of the light emitting functional layer on the side wall of the at least one recessed part is less than the thickness of the part of the light emitting functional layer in the first opening.

18. The display substrate according to any one of claims 15-17, wherein, The normal projection of the bottom of the recessed part on the substrate substrate does not overlap the normal projection of the first electrode on the substrate substrate.

19. The display substrate according to any one of claims 15-18, wherein, In the direction perpendicular to the substrate substrate, the bottom of the recessed part overlaps the first electrode, and the distance between the bottom of the recessed part and the first electrode is greater than 2000 angstroms.

20. The display substrate according to any one of claims 15-19, wherein, 21. The display substrate of any one of claims 1-20, further comprising: a spacer located on a side of the pixel defining part away from the substrate substrate, ​ A projection of the spacer on the substrate does not overlap with a projection of the recess on the substrate.

22. A display substrate, comprising: a substrate; a plurality of sub-pixels on the substrate, each of at least some of the sub-pixels comprising a first electrode, a light-emitting functional layer, and a second electrode arranged in a stack, the first electrode being between the light-emitting functional layer and the substrate, the light-emitting functional layer comprising a plurality of film layers; a pixel defining pattern on a side of the first electrode distal to the substrate, the pixel defining pattern comprising a plurality of first openings configured to expose the first electrodes of the plurality of sub-pixels, a plurality of second openings, and a pixel defining portion surrounding the plurality of first openings and the plurality of second openings; an insulating layer between the first electrode and the substrate, wherein the pixel defining portion between adjacent sub-pixels is provided with at least one recess on a side distal to the substrate, a depth of the recess is not less than a thickness of the light-emitting functional layer, and a distance between a bottom of the recess and the substrate is greater than a distance between a surface of the first electrode distal to the substrate and the substrate; each of the at least one recess comprises two side edges and a bottom edge in a cross-section parallel to an arrangement direction of the adjacent sub-pixels and perpendicular to a plane of the substrate, a distance between the two side edges gradually increases in a direction of the insulating layer distal to the substrate, and an angle at a connection between at least one of the side edges and the bottom edge is 100-110 degrees; the insulating layer comprises a recess between the adjacent sub-pixels, and the second openings expose at least part of the recess.

23. The display substrate of claim 22, further comprising: an isolation layer between the first electrode and the insulating layer, two side surfaces of the isolation layer are in contact with the first electrode and the insulating layer respectively, a material of the isolation layer comprises inorganic non-metallic material, and a material of the insulating layer comprises organic material, wherein the adjacent sub-pixels comprise a first sub-pixel and a second sub-pixel, a light-emitting efficiency of the first sub-pixel is less than a light-emitting efficiency of the second sub-pixel, the isolation layer comprises a first isolation portion and a second isolation portion, the first isolation portion overlaps with the first electrode of the first sub-pixel, and the second isolation portion overlaps with the first electrode of the second sub-pixel; a slot of the recess comprises a first edge and a second edge arranged oppositely, the first isolation portion comprises a first protruding portion protruding relative to the first edge, the second isolation portion comprises a second protruding portion protruding relative to the second edge, the pixel defining portion covers the first protruding portion, and the second openings expose the second protruding portion.

24. The display substrate of claim 22, wherein, the first electrode is in contact with the insulating layer, and a material of the insulating layer comprises organic material. 25.The display substrate of claim 24, wherein, the at least one recess comprises a plurality of recesses, and the recesses are arranged on both sides of the second openings between the adjacent sub-pixels in the arrangement direction of the adjacent sub-pixels. 26.The display substrate according to claim 24 or 25, wherein, Along an arrangement direction of the adjacent sub-pixels, a slot of the groove comprises oppositely arranged first and second edges, and the pixel defining portion covers the first and second edges.

27. The display substrate of any of claims 24-26, wherein, Along an arrangement direction of the adjacent sub-pixels, a slot of the groove comprises oppositely arranged first and second edges, and the second opening exposes at least one of the first and second edges.

28. The display substrate of any of claims 22-27, wherein, A thickness of a portion of the light-emitting functional layer on a sidewall of the at least one recess is less than a thickness of a portion of the light-emitting functional layer in the first opening.

29. The display substrate of any of claims 22-28, wherein, A bottom of the recess does not overlap a projection of the first electrode on the substrate.

30. The display substrate according to any one of claims 22-29, wherein, Along a direction perpendicular to the substrate, the bottom of the recess overlaps the first electrode, and a distance between the bottom of the recess and the first electrode is greater than 2000 angstroms.

31. A display device comprising the display substrate according to any one of claims 1 to 30.

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