Display substrate and manufacturing method therefor, and display device

Abstract

A display substrate and a manufacturing method therefor, and a display device. In the display substrate, a pixel defining layer comprises a first pixel aperture and a first isolation aperture, the first pixel aperture is located on the side of a first electrode of a first light-emitting element distant from a base substrate and exposes at least part of the first electrode, and the first isolation aperture is located on the periphery of the first pixel aperture; the pixel defining layer comprises a first pixel defining portion located between the first pixel aperture and the first isolation aperture and a second pixel defining portion located on the side of the first isolation aperture distant from the first pixel aperture; and the first pixel defining portion comprises a first main body portion and a first compensation portion which are connected, the first compensation portion is located on the side of the first main body portion close to the first isolation aperture, and the first compensation portion is provided with a first protruding contour protruding from the top of the first main body portion in a direction away from the base substrate, so that the maximum height of the first compensation portion is greater than the maximum height of the first main body portion. Therefore, the display substrate can avoid dark spots and color casts.

Description

Display substrate, manufacturing method thereof, and display device Technical Field

[0001] Embodiments of the present disclosure relate to a display substrate, a manufacturing method thereof, and a display device. Background Art

[0002] Organic light-emitting diode (OLED) displays, due to their advantages such as wide color gamut, high contrast, thin and lightweight design, self-luminescence, and wide viewing angle, have become a research hotspot and technological development direction for major manufacturers. Currently, OLED displays are widely used in a variety of electronic products, ranging from small electronic products such as smart bracelets, smart watches, smartphones, and tablets to large electronic products such as laptops, desktop computers, and televisions. As a result, the market demand for active-matrix OLED displays is also growing rapidly.

[0003] With the continuous development of display technology, people's pursuit of display quality is getting higher and higher. In order to further reduce power consumption and achieve high brightness, the single-layer light-emitting layer in the light-emitting element of OLED can be replaced with two light-emitting layers, and a charge generation layer (CGL) is added between the two light-emitting layers to achieve a double-layer light-emitting (Tandem EL) design. Since the display device using the double-layer light-emitting (Tandem EL) design has two light-emitting layers, its light-emitting brightness can be approximately twice that of a single light-emitting layer. Therefore, the display device using the double-layer light-emitting design has the advantages of long life, low power consumption, and high brightness.

[0004] Summary of the Invention

[0005] The present disclosure also provides a display substrate, a method for manufacturing the same, and a display device. This display substrate mitigates or even eliminates the adverse effects of exposure diffraction on the first pixel-defining portion by adding a first compensation portion to the edge of the first pixel-defining portion adjacent to the first isolation cutout. This prevents excessive thinning of the first pixel-defining portion adjacent to the first isolation cutout, thereby avoiding dark spots and color shift.

[0006] At least one embodiment of the present disclosure provides a display substrate, comprising: a base substrate; a plurality of light-emitting elements located on the base substrate; and a pixel-defining layer, each of the light-emitting elements comprising a first electrode, a light-emitting functional layer, and a second electrode, the plurality of light-emitting elements comprising a first light-emitting element, the pixel-defining layer comprising a first pixel opening and a first isolating opening, the first pixel opening being located on a side of the first electrode of the first light-emitting element away from the base substrate and exposing at least a portion of the first electrode, the first isolating opening being located around the first pixel opening, the pixel-defining layer comprising a first pixel-defining portion located between the first pixel opening and the first isolating opening, and a second pixel-defining portion located on a side of the first isolating opening away from the first pixel opening, the first pixel-defining portion comprising a first main portion and a first compensation portion connected to each other, the first compensation portion being located on a side of the first main portion close to the first isolating opening, the first compensation portion having a first protruding profile that protrudes from a top of the first main portion toward a direction away from the base substrate, such that a maximum height of the first compensation portion is greater than a maximum height of the first main portion.

[0007] For example, in a display substrate provided by an embodiment of the present disclosure, one end of the first protruding contour is located at the top of the first main body portion, and the other end of the first protruding contour is located at the edge of the first partition opening.

[0008] For example, in the display substrate provided in one embodiment of the present disclosure, the first convex profile and the first main body portion are away from an upper surface of the base substrate at an inflection point, and the angle between the tangent line passing through the inflection point and tangent to the first convex profile and the tangent line passing through the inflection point and tangent to the upper surface is less than 180 degrees.

[0009] For example, in a display substrate provided in one embodiment of the present disclosure, an edge profile of the first pixel defining portion close to the first isolation opening has a first slope angle, and an edge profile of the second pixel defining portion close to the first isolation opening has a second slope angle, and the difference between the first slope angle and the second slope angle ranges from 0 to 40 degrees.

[0010] For example, in a display substrate provided in an embodiment of the present disclosure, the first slope angle is greater than the second slope angle, and the difference between the first slope angle and the second slope angle ranges from 20 to 40 degrees.

[0011] For example, in a display substrate provided in an embodiment of the present disclosure, an edge profile of the first pixel defining portion close to the first pixel opening has a third slope angle, and a difference between the third slope angle and the first slope angle ranges from 20 to 40 degrees.

[0012] For example, in a display substrate provided in an embodiment of the present disclosure, a difference between the third slope angle and the second slope angle is less than 5 degrees.

[0013] For example, in the display substrate provided in one embodiment of the present disclosure, the maximum height of the first main body portion is the same as the maximum height of the second pixel defining portion, and the maximum height of the first compensation portion is greater than the maximum height of the first main body portion.

[0014] For example, in the display substrate provided in an embodiment of the present disclosure, a side of the first protruding contour close to the first main body portion has a fourth slope angle, and a value range of the fourth slope angle is 0 to 20 degrees.

[0015] For example, in the display substrate provided in one embodiment of the present disclosure, the direction from the first pixel opening to the first isolation opening is the first direction, and the ratio of the width of the first compensation portion in the first direction to the width of the first main portion in the first direction is in the range of 0 to 0.3.

[0016] For example, the display substrate provided by one embodiment of the present disclosure also includes: a partition functional layer, which is located between the base substrate and the multiple light-emitting elements in a direction perpendicular to the base substrate, and the partition functional layer includes a first partition groove, and the orthographic projection of the first partition opening on the base substrate covers the edge of the first partition groove close to the first pixel opening.

[0017] For example, in a display substrate provided by an embodiment of the present disclosure, the light-emitting functional layer includes a charge generation layer, and the charge generation layer is disconnected at an edge of the first partition groove close to the first pixel opening.

[0018] For example, in a display substrate provided in an embodiment of the present disclosure, the light-emitting functional layer further includes a first light-emitting layer and a second light-emitting layer located on both sides of the charge generation layer in a direction perpendicular to the base substrate.

[0019] For example, in a display substrate provided in an embodiment of the present disclosure, the plurality of light-emitting elements include a second light-emitting element, and the pixel defining layer further includes a second pixel opening, which is located on a side of the second light-emitting element where the first electrode is away from the base substrate and exposes at least a portion of the first electrode, the second pixel opening is located on a side of the first isolating opening away from the first pixel opening, and the second pixel defining portion is located between the first isolating opening and the second pixel opening.

[0020] For example, in a display substrate provided by an embodiment of the present disclosure, a size of the second pixel defining portion in the first direction is larger than a size of the first pixel defining portion in the first direction.

[0021] For example, in a display substrate provided in an embodiment of the present disclosure, the second pixel defining portion includes a connected second main portion and a second compensation portion, the second compensation portion is located on a side of the second main portion close to the first isolation opening, and the second compensation portion has a second raised profile that raises from the top of the second main portion in a direction away from the base substrate, so that the maximum height of the second compensation portion is greater than the maximum height of the second main portion.

[0022] For example, in a display substrate provided in an embodiment of the present disclosure, the first compensation portion and the second compensation portion are connected at two opposite edges of the first partition opening in a second direction to surround the first partition opening, and the second direction is perpendicular to the direction from the first pixel opening to the first partition opening.

[0023] For example, in a display substrate provided by an embodiment of the present disclosure, a size of the second pixel defining portion in the first direction is equal to a size of the first pixel defining portion in the first direction.

[0024] For example, in a display substrate provided in an embodiment of the present disclosure, the plurality of light-emitting elements include a third light-emitting element, the pixel defining layer further includes a third pixel opening and a second isolation opening, the third pixel opening is located on a side of the first electrode of the third light-emitting element away from the base substrate and exposes at least a portion of the first electrode, the second isolation opening is located between the first pixel opening and the third pixel opening, the pixel defining layer includes a third pixel defining portion located between the first pixel opening and the second isolation opening and a fourth pixel defining portion located between the second isolation opening and the third pixel opening, the third pixel defining portion includes a connected third main portion and a third compensation portion, the third compensation portion is located on a side of the third main portion close to the second isolation opening, the third compensation portion has a third convex profile protruding from the top of the third main portion in a direction away from the base substrate, so that the maximum height of the third compensation portion is greater than the maximum height of the third main portion.

[0025] For example, the display substrate provided by one embodiment of the present disclosure also includes: a partitioning functional layer, which is located between the base substrate and the multiple light-emitting elements in a direction perpendicular to the base substrate, and the partitioning functional layer includes a second partitioning groove, and the orthographic projection of the second partitioning opening on the base substrate covers the edge of the second partitioning groove close to the first pixel opening.

[0026] For example, in a display substrate provided by an embodiment of the present disclosure, the shape of the orthographic projection of the first partition opening on the base substrate includes at least one of a strip shape and an L shape.

[0027] For example, in a display substrate provided by an embodiment of the present disclosure, the first compensation portion is reused as a spacer.

[0028] For example, in the display substrate provided in an embodiment of the present disclosure, the maximum height of the spacer in a direction perpendicular to the base substrate ranges from 0.9 to 1.3 microns.

[0029] For example, in the display substrate provided in an embodiment of the present disclosure, the difference between the maximum height of the spacer and the maximum height of the first main body is in the range of 0.1-0.5 micrometers.

[0030] At least one embodiment of the present disclosure also provides a display substrate, which includes: a base substrate; a plurality of light-emitting elements located on the base substrate; and a pixel defining layer, each of the light-emitting elements including a first electrode, a light-emitting functional layer and a second electrode, the plurality of light-emitting elements including a first light-emitting element, the pixel defining layer including a first pixel opening and a first isolation opening, the first pixel opening being located on a side of the first electrode of the first light-emitting element away from the base substrate and exposing at least a portion of the first electrode, the first isolation opening being located around the first pixel opening, the pixel defining layer including a first pixel defining portion located between the first pixel opening and the first isolation opening and a second pixel defining portion located on a side of the first isolation opening away from the first pixel opening, the edge profile of the first pixel defining portion close to the first isolation opening having a first slope angle, the edge profile of the second pixel defining portion close to the first isolation opening having a second slope angle, the first slope angle being different from the second slope angle.

[0031] For example, in a display substrate provided in an embodiment of the present disclosure, the first slope angle is greater than the second slope angle.

[0032] At least one embodiment of the present disclosure further provides a display device, which includes the display substrate provided by any one of the above items.

[0033] At least one embodiment of the present disclosure further provides a method for manufacturing a display substrate, which includes: forming a first electrode on a base substrate; forming a pixel defining layer on a side of the first electrode away from the base substrate; forming a light-emitting functional layer on a side of the pixel defining layer away from the first electrode; and forming a second electrode on a side of the light-emitting functional layer away from the base substrate, the display substrate includes a plurality of light-emitting elements, each of the light-emitting elements includes the first electrode, the light-emitting functional layer and the second electrode, the plurality of light-emitting elements includes a first light-emitting element, the pixel defining layer includes a first pixel opening and a first isolation opening, the first pixel opening is located on a side of the first light-emitting element where the first electrode is away from the base substrate. One side of the substrate and exposing at least a portion of the first electrode, the first isolating opening is located at the periphery of the first pixel opening, the pixel defining layer includes a first pixel defining portion located between the first pixel opening and the first isolating opening and a second pixel defining portion located on a side of the first isolating opening away from the first pixel opening, the first pixel defining portion includes a connected first main portion and a first compensation portion, the first compensation portion is located on a side of the first main portion close to the first isolating opening, and the first compensation portion has a first convex profile convex from the top of the first main portion toward a direction away from the base substrate, so that the maximum height of the first compensation portion is greater than the maximum height of the first main portion.

[0034] For example, in the manufacturing method of the display substrate provided in an embodiment of the present disclosure, forming a pixel defining layer on the side of the first electrode away from the base substrate includes: forming a pixel defining material layer on the side of the first electrode away from the base substrate; and patterning the pixel defining material layer using a half-tone mask to form the first pixel opening, the first isolation opening, the first pixel defining portion and the second pixel defining portion, the first main body portion of the first pixel defining portion corresponds to the partially transparent portion of the half-tone mask, and the first compensation portion corresponds to the completely blocking portion of the half-tone mask. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0036] FIG1 is a schematic cross-sectional view of a display substrate provided in one embodiment of the present disclosure;

[0037] FIG2 is a focused ion beam scanning electron microscope image of a display substrate provided by one embodiment of the present disclosure;

[0038] FIG3A is a graph showing an H-direction color shift test of a display substrate provided by an embodiment of the present disclosure;

[0039] FIG3B is a V-direction color shift test diagram of a display substrate provided by an embodiment of the present disclosure;

[0040] FIG4 is a schematic diagram of a color shift test direction of a display substrate provided by an embodiment of the present disclosure;

[0041] FIG5 is a schematic plan view of a display substrate provided in one embodiment of the present disclosure;

[0042] FIG6 is a schematic cross-sectional view of a display substrate provided by an embodiment of the present disclosure along the AB direction in FIG5 ;

[0043] FIG7 is a schematic cross-sectional view of another display substrate provided by an embodiment of the present disclosure along the AB direction in FIG5 ;

[0044] FIG8 is a schematic plan view of another display substrate provided by an embodiment of the present disclosure;

[0045] FIG9 is a schematic cross-sectional view of a display substrate along the CD direction in FIG8 provided by one embodiment of the present disclosure;

[0046] FIG10 is a schematic cross-sectional view of a display substrate provided by an embodiment of the present disclosure along the direction EF in FIG8 ;

[0047] FIG11 is a schematic plan view of another display substrate provided in one embodiment of the present disclosure;

[0048] FIG12 is a schematic cross-sectional view of a display substrate provided by one embodiment of the present disclosure along the GH direction in FIG11 ;

[0049] FIG13 is a schematic plan view of another display substrate provided by an embodiment of the present disclosure;

[0050] 14A-14C are plan views of other display substrates provided in one embodiment of the present disclosure;

[0051] FIG15 is a schematic diagram of a display device provided by an embodiment of the present disclosure;

[0052] FIG16 is a flow chart of a method for manufacturing a display substrate provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

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

[0054] Unless otherwise defined, technical or scientific terms used in this disclosure should have the ordinary meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are simply used to distinguish different components. The words "include" or "comprising" and similar terms mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0055] The features such as “parallel”, “perpendicular” and “same” used in the embodiments of the present disclosure include the features such as “parallel”, “perpendicular” and “same” in a strict sense, as well as the cases where “approximately parallel”, “approximately perpendicular” and “approximately the same” contain certain errors, taking into account the errors associated with the measurement and the measurement of specific quantities (for example, the limitations of the measurement system), and are expressed as being within the acceptable deviation range for a specific value determined by ordinary technicians in this field. For example, “approximately” can mean within one or more standard deviations, or within 10% or 5% of the value. When the number of a component is not specifically indicated below in the embodiments of the present disclosure, it means that the component can be one or more, or can be understood as at least one. “At least one” means one or more, and “multiple” means at least two. The “same layer” in the embodiments of the present disclosure refers to the relationship between multiple film layers formed by the same material after the same step (for example, a one-step patterning process). The “same layer” here does not always mean that the thickness of multiple film layers is the same or the height of multiple film layers in the cross-sectional view is the same.

[0056] In an OLED display device with a double-layer light-emitting design, since there is a charge generation layer between the two light-emitting layers, it is necessary to add a pixel partition structure between adjacent sub-pixels to isolate the charge generation layer. For example, the pixel partition structure can be a pixel partition groove, and the charge generation layer can be broken in the pixel partition groove, thereby avoiding the crosstalk problem between adjacent sub-pixels. After adding the above-mentioned pixel partition groove, in order to ensure that the charge generation layer is effectively isolated, it is necessary to remove the pixel defining layer above the pixel partition groove, that is, to form an isolation opening in the pixel defining layer to expose the pixel partition groove. This is because if the pixel defining layer is not removed, the pixel partition groove will be filled.

[0057] In this regard, the embodiment of the present disclosure provides a display substrate, a manufacturing method thereof, and a display device. The display substrate includes a base substrate, a plurality of light-emitting elements, and a pixel defining layer; the plurality of light-emitting elements are located on the base substrate; each light-emitting element includes a first electrode, a light-emitting functional layer, and a second electrode, and the plurality of light-emitting elements include a first light-emitting element; the pixel defining layer includes a first pixel opening and a first isolation opening, the first pixel opening is located on the side of the first electrode of the first light-emitting element away from the base substrate, and exposes at least a portion of the first electrode, and the first isolation opening is located around the first pixel opening; the pixel defining layer includes a first pixel defining portion located between the first pixel opening and the first isolation opening and a second pixel defining portion located on the side of the first isolation opening away from the first pixel opening. Thus, the display substrate can realize a double-layer light-emitting (Tandem EL) design, and therefore has the advantages of long life, low power consumption, and high brightness. On the other hand, the display substrate also avoids crosstalk between adjacent light-emitting elements.

[0058] Hereinafter, the display substrate, the manufacturing method thereof, and the display device provided by the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0059] Figure 1 is a schematic cross-sectional view of a display substrate provided in accordance with an embodiment of the present disclosure. As shown in Figure 1 , the display substrate 100 includes a base substrate 110, a plurality of light-emitting elements, and a pixel-defining layer 130. The plurality of light-emitting elements are disposed on the base substrate 110 and include a first light-emitting element 120G. Each light-emitting element includes a first electrode 140, a light-emitting functional layer 150, and a second electrode 160. The pixel-defining layer 130 includes a first pixel opening 131. The first pixel opening 131 is located on a side of the first electrode 140 of the first light-emitting element 120G that is away from the base substrate 110, exposing at least a portion of the first electrode 140. The light-emitting functional layer 150 of the first light-emitting element 120G is disposed in contact with the first electrode 140 of the first light-emitting element 120G through the first pixel opening 131. The second electrode 160 of the first light-emitting element 120G is located on a side of the light-emitting functional layer 150 that is away from the first electrode 140. In the first light-emitting element 120G, the light-emitting functional layer 150 is driven by a current flowing between the first electrode 140 and the second electrode 160 to produce a light-emitting display. It should be noted that the above-mentioned light-emitting functional layer may include multiple light-emitting layers, charge generation layers and other auxiliary functional layers for assisting light emission, such as a hole transport layer, an electron transport layer and the like.

[0060] As shown in Figure 1, the pixel-defining layer 130 also includes a first isolation opening 132, which is located around the first pixel opening 131 and is configured to expose the pixel isolation structure. In this case, the pixel-defining layer 130 includes a first pixel-defining portion 130A located between the first pixel opening 131 and the first isolation opening 132, and a second pixel-defining portion 130B located away from the first pixel opening 131 at the first isolation opening 132. The first pixel-defining portion 130A covers the edge of the first electrode 140 of the first light-emitting element 120G and can limit the light emission angle of the first light-emitting element 120G. The second pixel-defining portion 130B covers the edge of the light-emitting element adjacent to the first light-emitting element 120G and can limit the light emission angle of the light-emitting element.

[0061] As shown in Figure 1, the display substrate 100 further includes a blocking functional layer 170, which is positioned perpendicularly to the base substrate 110 between the base substrate 110 and the plurality of light-emitting elements 120. The blocking functional layer 170 includes a first blocking groove 171, which is configured to at least block the charge generation layer in the light-emitting functional layer. In other words, the aforementioned pixel blocking structure is a blocking groove. However, the disclosed embodiments include but are not limited to this, and the aforementioned pixel blocking structure may also be other forms of pixel blocking structures, such as pixel blocking columns.

[0062] As shown in Figure 1, the light-emitting functional layer 150 of the first light-emitting element 120G includes a first light-emitting layer 151, a second light-emitting layer 152, and a charge generation layer 153 located between the first light-emitting layer 151 and the second light-emitting layer 152. The charge generation layer has strong conductivity, which can make the light-emitting functional layer have the advantages of long life, low power consumption and high brightness. For example, compared with a light-emitting functional layer without a charge generation layer, the first light-emitting element can increase the luminous brightness by nearly double by providing a charge generation layer in the light-emitting functional layer. At the same time, as shown in Figure 1, since the pixel defining layer 130 is provided with a first isolation opening 132, and a pixel isolation structure is provided below the first isolation opening 132, the charge generation layer is disconnected at the position where the pixel isolation structure 171 is located in the first isolation opening 132. As a result, the display substrate can avoid crosstalk between adjacent light-emitting elements caused by the charge generation layer with higher conductivity in the light-emitting functional layer.

[0063] In summary, the display substrate can realize a double-layer light-emitting (Tandem EL) design, and therefore has the advantages of long life, low power consumption, and high brightness. In addition, the display substrate can also avoid crosstalk between adjacent light-emitting elements through the above-mentioned first isolation opening and pixel isolation structure. It should be noted that the conductivity of the charge generation layer is greater than the conductivity of the first light-emitting layer and the conductivity of the second light-emitting layer, and is less than the conductivity of the second electrode. In addition, the light-emitting functional layer may also include other sub-functional layers in addition to the charge generation layer, the first light-emitting layer and the second light-emitting layer, for example, a hole injection layer, a hole transport layer, an electron injection layer and an electron transport layer.

[0064] On the other hand, the inventors of this application have noticed that due to the close distance between the pixel opening and the spacer opening in the light-emitting element, the pixel-defining layer between the pixel opening and the spacer opening is affected by the exposure diffraction effect of the pixel opening and the spacer opening during the exposure process, resulting in excessive thinning or even partial removal. As a result, this phenomenon may cause the pixel-defining layer to fail to completely cover the edge of the anode, causing a micro-short circuit between the anode and the cathode, thereby leading to defects such as dark spots. In addition, this phenomenon causes the slope angle of the edge profile of the pixel-defining layer of different light-emitting elements to differ, resulting in uneven light emission angles of different light-emitting elements, thereby causing color shift.

[0065] As shown in Figure 1 , due to the close distance between the first pixel opening 131 and the first partitioning opening 132, the first pixel defining portion 130A between the first pixel opening 131 and the first partitioning opening 132 is affected by the exposure diffraction effect of both the first pixel opening 131 and the first partitioning opening 132, causing it to be excessively thinned or even partially removed. Consequently, the maximum height of the first pixel defining portion 130A is smaller than the maximum height of the second pixel defining portion 130B, and the slope angle of the edge profile of the first pixel defining portion 130A is also smaller than the slope angle of the edge profile of the second pixel defining portion 130B.

[0066] FIG2 is a focused ion beam scanning electron microscope image of a display substrate provided by an embodiment of the present disclosure. The pixel defining layer in the display substrate shown in FIG2 adopts the same design as FIG1. ​​As shown in FIG2, the pixel defining layer 130 at the edge of the first electrode 140 is relatively thin, with a minimum slope angle of only 13 degrees. Conductive metal particles (e.g., silver particles) at the edge of the first electrode 140 pass through the pixel defining layer 130 and short-circuit with the second electrode 160, which can easily lead to defects such as dark spots and may also cause risks such as electrostatic discharge.

[0067] Figure 3A shows a color shift test diagram for a display substrate in the H direction, according to one embodiment of the present disclosure; Figure 3B shows a color shift test diagram for a display substrate in the V direction, according to one embodiment of the present disclosure; and Figure 4 is a schematic diagram illustrating the color shift test directions for a display substrate in the V direction, according to one embodiment of the present disclosure. As shown in Figure 3A, since the light-emitting element lacks the aforementioned isolation cutout in the V direction, it is less affected. However, the color shift in the H direction is more severe.

[0068] To address the aforementioned dark spot and color shift issues, the present disclosure further provides a display substrate. The display substrate includes a base substrate, a plurality of light-emitting elements, and a pixel-defining layer. The plurality of light-emitting elements are located on the base substrate. Each light-emitting element includes a first electrode, a light-emitting functional layer, and a second electrode. The plurality of light-emitting elements includes a first light-emitting element. The pixel-defining layer includes a first pixel opening and a first isolation opening. The first pixel opening is located on a side of the first electrode of the first light-emitting element away from the base substrate, exposing at least a portion of the first electrode. The first isolation opening is located around the first pixel opening. The pixel-defining layer includes a first pixel-defining portion located between the first pixel opening and the first isolation opening, and a second pixel-defining portion located on a side of the first isolation opening away from the first pixel opening. The first pixel-defining portion includes a first main portion and a first compensation portion connected to each other. The first compensation portion is located on a side of the first main portion near the first isolation opening. The first compensation portion has a first protruding profile that protrudes from the top of the first main portion toward the base substrate, such that the maximum height of the first compensation portion is greater than the maximum height of the first main portion. Therefore, the display substrate alleviates or even eliminates the adverse effects of the exposure diffraction effect on the first pixel defining portion by adding a first compensation portion to the edge of the first pixel defining portion next to the first isolation opening, thereby avoiding excessive thinning of the first pixel defining portion next to the first isolation opening, thereby avoiding dark spots and color deviation problems.

[0069] FIG5 is a schematic plan view of a display substrate provided in accordance with an embodiment of the present disclosure; FIG6 is a schematic cross-sectional view of a display substrate along the AB direction in FIG5 provided in accordance with an embodiment of the present disclosure.

[0070] As shown in Figures 5 and 6, the display substrate 100 includes a base substrate 110, a plurality of light-emitting elements 120, and a pixel-defining layer 130. The plurality of light-emitting elements 120 are located on the base substrate 110 and include a first light-emitting element 120G. Each light-emitting element 120 includes a first electrode 140, a light-emitting functional layer 150, and a second electrode 160. The pixel-defining layer 130 includes a first pixel opening 131. The first pixel opening 131 is located on a side of the first electrode 140 of the first light-emitting element 120G that is away from the base substrate 110, exposing at least a portion of the first electrode 140. The light-emitting functional layer 150 of the first light-emitting element 120G is disposed in contact with the first electrode 140 of the first light-emitting element 120G through the first pixel opening 131. The second electrode 160 of the first light-emitting element 120G is located on a side of the light-emitting functional layer 150 that is away from the first electrode 140. In the first light-emitting element 120G, the light-emitting functional layer 150 is driven by a current between the first electrode 140 and the second electrode 160 to produce a light-emitting display. It should be noted that the above-mentioned light-emitting functional layer may include multiple light-emitting layers, charge generation layers and other auxiliary functional layers for assisting light emission, such as a hole transport layer, an electron transport layer and the like.

[0071] For example, the first electrode 140 can be an anode, and the second electrode 160 can be a cathode. Multiple light-emitting elements 120 can share the second electrode 160. For example, the cathode can be formed from a material with high conductivity and a low work function, such as a metal. For example, the anode can be formed from a transparent conductive material with a high work function. Of course, the embodiments of the present disclosure include but are not limited to this, and the first electrode can also be a cathode and the second electrode can be an anode.

[0072] For example, the first electrode 140 can be made of metal materials such as magnesium (Mg), silver (Ag), copper (Cu), or

[0073] Any one or more of copper (Cu), aluminum (Al), titanium (Ti) and molybdenum (Mo), or alloy materials of the above metals, such as aluminum neodymium alloy (AlNd) or molybdenum niobium alloy (MoNb), can be a single-layer structure, or a multi-layer composite structure, such as Ti / Al / Ti, etc., or a stack structure formed by metal and transparent conductive material, such as ITO / Ag / ITO, Mo / AlNd / ITO and other reflective materials.

[0074] For example, the second electrode 160 can be made of any one or more of magnesium (Mg), silver (Ag), aluminum (Al), or an alloy made of any one or more of the above metals, or a transparent conductive material, such as indium tin oxide (ITO), or a multilayer composite structure of metal and transparent conductive material.

[0075] As shown in Figure 6, the pixel-defining layer 130 also includes a first isolation opening 132, which is located around the first pixel opening 131 and is configured to expose the pixel isolation structure. In this case, the pixel-defining layer 130 includes a first pixel-defining portion 130A located between the first pixel opening 131 and the first isolation opening 132, and a second pixel-defining portion 130B located away from the first pixel opening 131 at the first isolation opening 132. The first pixel-defining portion 130A covers the edge of the first electrode 140 of the first light-emitting element 120G and can limit the light emission angle of the first light-emitting element 120G. The second pixel-defining portion 130B covers the edge of the light-emitting element adjacent to the first light-emitting element 120G and can limit the light emission angle of the light-emitting element.

[0076] As shown in FIG6 , the first pixel defining portion 130A includes a first main portion 1301 and a first compensation portion 1302 connected to each other. The first compensation portion 1302 is located on a side of the first main portion 1301 near the first isolation opening 132. The first compensation portion 1302 has a first raised profile 191 that protrudes from the top of the first main portion 1301 away from the base substrate 110, such that the maximum height of the first compensation portion 1302 is greater than the maximum height of the first main portion 1301. It should be noted that the aforementioned "maximum height" can refer to the maximum dimension of the compensation portion or main portion in a direction perpendicular to the base substrate, or the maximum distance between the upper surface of the compensation portion or main portion away from the base substrate and the base substrate or the isolation functional layer described later.

[0077] In the display substrate provided by the embodiment of the present disclosure, since the first pixel defining portion includes the first compensation portion, and the first compensation portion has a first raised profile that protrudes from the top of the first main portion in a direction away from the base substrate, so that the maximum height of the first compensation portion is greater than the maximum height of the first main portion, the first compensation portion can play a certain light-blocking role during the exposure process to alleviate or even eliminate the adverse effects of the exposure diffraction effect on the first pixel defining portion, thereby avoiding excessive thinning of the first pixel defining portion next to the first isolation opening, thereby avoiding dark spots and other defects caused by the first pixel defining portion being unable to completely cover the edge of the first electrode, and also ensuring that the slope angle of the edge profile of the first pixel defining portion close to the first pixel opening is relatively consistent with the slope angle of the edges of other pixel openings, thereby avoiding color deviation.

[0078] In some examples, the first main portion 1301 and the first compensation portion 1302 included in the first pixel defining portion 130A are integrally formed.

[0079] In some examples, the material of the pixel defining layer 130 can be a photosensitive material, such as a photosensitive resin. Thus, the pixel defining layer can be patterned simply through an exposure process. Furthermore, to form the first compensation portion and the first main portion of different heights, a half-tone mask or double mask process can be used, which is not limited in the present embodiment.

[0080] In the display substrate provided by the embodiment of the present disclosure, the first compensation portion 1302 can be reused as a spacer.

[0081] For example, the maximum height of the first main portion 1301 may range from 0 to 0.8 micrometers. In this case, the maximum height of the first compensation portion 1302 in a direction perpendicular to the base substrate 110 may range from 0.9 to 1.3 micrometers.

[0082] For example, the difference between the maximum height of the first compensation portion 1302 and the maximum height of the first main portion 1301 ranges from 0.1 to 0.5 micrometers.

[0083] For example, the difference between the maximum height of the first compensation portion 1302 and the maximum height of the first main portion 1301 is 0.25 microns. In some examples, as shown in FIG6 , the light-emitting functional layer 150 of the first light-emitting element 120G includes a first light-emitting layer 151, a second light-emitting layer 152, and a charge generation layer 153 located between the first and second light-emitting layers 151, 152. The charge generation layer has strong conductivity, which can provide the light-emitting functional layer with advantages such as long life, low power consumption, and high brightness. For example, compared to a light-emitting functional layer without a charge generation layer, the first light-emitting element can achieve a brightness nearly doubled by including the charge generation layer in the light-emitting functional layer. Furthermore, as shown in FIG6 , because the pixel defining layer 130 is provided with a first isolation opening 132 and a pixel isolation structure is disposed below the first isolation opening 132, the charge generation layer is disconnected within the first isolation opening 132 at the location of the pixel isolation structure 171. This prevents the highly conductive charge generation layer in the light-emitting functional layer from causing crosstalk between adjacent light-emitting elements.

[0084] In some examples, the charge generation layer 153 may include an n-type doped layer for generating holes and a p-type doped layer for generating electrons, which are stacked. For example, the material of the charge generation layer 153 may include an n-type doped organic layer / p-type doped organic layer, such as BPhen:Cs / NPB:F4-TCNQ, Alq3:Li / NPB:FeCl3, TPBi:Li / NPB:FeCl3 and Alq3:Mg / m-MTDATA:F4-TCNQ. Of course, the embodiments of the present disclosure include but are not limited to this, and the material of the charge generation layer may also include an n-type doped organic layer / inorganic metal oxide, such as Alq3:Mg / WO3, Bphen:Li / MoO3, BCP:Li / V2O5 and BCP:Cs / V2O5; or, an n-type doped organic layer / organic layer, such as Alq3:Li / HAT-CN; or, a non-doped material, such as F 16 CuPc / CuPc and Al / WO3 / Au.

[0085] In some examples, the materials of the first light emitting layer 151 and the second light emitting layer 152 can be selected from pyrene derivatives, anthracene derivatives, fluorene derivatives, perylene derivatives, styrylamine derivatives, metal complexes, and the like.

[0086] Of course, in addition to the above-mentioned first light-emitting layer 151, the second light-emitting layer 152 and the charge generation layer 153, the light-emitting functional layer 150 may also include other auxiliary functional layers for auxiliary light emission, such as a hole injection layer, a hole transport layer, an electron injection layer and an electron transport layer.

[0087] For example, the material of the hole injection layer may include oxides such as molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, and manganese oxide.

[0088] For example, the material of the hole injection layer may also include organic materials, such as hexacyanohexaazatriphenylene, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), and 1,2,3-tris[(cyano)(4-cyano-2,3,5,6-tetrafluorophenyl)methylene]cyclopropane.

[0089] For example, the material of the hole transport layer may include aromatic amines and dimethylfluorene or carbazole materials having hole transport properties, such as: 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB), N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (TPD), 4-phenyl-4'-(9-phenylfluorene-9-yl)triphenylamine (BAFLP), 4,4'-bis[N-(9,9-dimethylfluorene-2-yl)-N-phenylamino]biphenyl (DFLDPBi), 4,4'-di(9-carbazolyl)biphenyl (CBP), 9-phenyl-3-[4-(10-phenyl-9-anthracenyl)phenyl]-9H-carbazole (PCzPA).

[0090] For example, the material of the electron transport layer may include aromatic heterocyclic compounds, such as benzimidazole derivatives, imidazole derivatives, pyrimidine derivatives, oxazine derivatives, quinoline derivatives, isoquinoline derivatives, phenanthroline derivatives, and the like.

[0091] For example, the material of the electron injection layer may be an alkali metal or a metal and a compound thereof, such as lithium fluoride (LiF), ytterbium (Yb), magnesium (Mg), and calcium (Ca).

[0092] 6 , one end of the first raised profile 191 is located at the top of the first main body portion 1301, and the other end of the first raised profile 191 is located at the edge of the first partition opening 132. Along the direction from the first pixel opening 131 to the first partition opening 132, the distance between the first raised profile 191 and the base substrate 110 first increases and then decreases.

[0093] In some examples, as shown in FIG6 , the first raised profile 191 and the first main body portion 1301 are away from the upper surface of the base substrate 110 at an inflection point, and an angle B between a tangent line passing through the inflection point and tangent to the first raised profile 191 and a tangent line passing through the inflection point and tangent to the upper surface is less than 180 degrees.

[0094] In some examples, as shown in FIG6 , the edge profile of the first pixel-defining portion 130A near the first partition opening 132 has a first slope angle A1, and the edge profile of the second pixel-defining portion 130B near the first partition opening 132 has a second slope angle A2. The difference between the first slope angle A1 and the second slope angle A2 ranges from 0 to 40 degrees. It should be noted that the aforementioned slope angles may be the angles between the bottom surface of the pixel-defining portion and a tangent line passing through a point on the edge of the profile and tangent to the profile.

[0095] For example, as shown in FIG6 , the first slope angle A1 is greater than the second slope angle A2 , and the difference between the first slope angle A1 and the second slope angle A2 ranges from 20 to 40 degrees.

[0096] In some examples, as shown in FIG. 6 , an edge profile of the first pixel defining portion 130A near the first pixel opening 131 has a third slope angle A3 , and a difference between the third slope angle A3 and the first slope angle A1 ranges from 20 to 40 degrees.

[0097] In some examples, as shown in FIG6 , the difference between the third slope angle A3 and the second slope angle A2 is less than 5 degrees. Due to the presence of the first compensation portion, the edge profile of the first pixel defining portion near the first pixel opening is not over-etched, and thus the slope angle difference with the edge profile of the second pixel defining portion is relatively small, thereby preventing color shift.

[0098] For example, as shown in FIG6 , the difference between the third slope angle A3 and the second slope angle A2 is less than 3 degrees, thereby further preventing color shift.

[0099] In some examples, as shown in FIG6 , the maximum height of the first main portion 1301 is the same as the maximum height of the second pixel defining portion 130B, and the maximum height of the first compensation portion 1302 is greater than the maximum height of the first main portion 1301. Thus, the first compensation portion 1302 can block light during the exposure process, thereby reducing the adverse effects of exposure diffraction effects on the first pixel defining portion and improving the slope angle of the edge profile of the first pixel defining portion near the first pixel opening.

[0100] In some examples, as shown in FIG6 , a side of the first raised profile 191 close to the first main body portion 1301 has a fourth slope angle A4 , and a value range of the fourth slope angle A4 is 0 to 20 degrees.

[0101] In some examples, as shown in Figure 6, the direction from the first pixel opening 131 to the first isolation opening 132 is the first direction, and the ratio of the width of the first compensation portion 1302 in the first direction to the width of the first main portion 1301 in the first direction is in the range of 0 to 0.3. Thus, the display substrate can prevent the first compensation portion from being too large, thereby preventing the slope angle of the edge profile of the first main portion from becoming significantly different from the slope angle of the edge profile of the pixel defining portion of other light-emitting elements.

[0102] For example, as shown in Figure 6, the width of the first pixel defining portion 130A in the first direction is 6.7 microns, the width of the first compensation portion 1302 in the first direction ranges from 4.7 microns to 6.2 microns, and the width of the first main body portion 1301 in the first direction can range from 0.5 microns to 2.0 microns.

[0103] For example, as shown in FIG6 , the width of the first pixel defining portion 130A in the first direction is 6.7 micrometers, the width of the first compensation portion 1302 in the first direction is 5.2 micrometers, and the width of the first main body portion 1301 in the first direction is 1.5 micrometers.

[0104] For example, as shown in FIG6 , the width of the first pixel defining portion 130A in the first direction is 6.7 micrometers, the width of the first compensation portion 1302 in the first direction is 4.7 micrometers, and the width of the first main body portion 1301 in the first direction is 2 micrometers.

[0105] In some examples, as shown in FIG6 , the display substrate 100 further includes a blocking functional layer 170, which is positioned between the base substrate 110 and the plurality of light-emitting elements 120 in a direction perpendicular to the base substrate 110. The blocking functional layer 170 includes a first blocking groove 171 configured to at least block the charge generation layer in the light-emitting functional layer. The orthographic projection of the first blocking opening 132 on the base substrate 110 covers the edge of the first blocking groove 171 near the first pixel opening 131. Thus, the first blocking opening can expose the first blocking groove, preventing it from being covered by the pixel-defining layer. Furthermore, the first blocking opening can also increase the step difference, thereby better blocking the charge generation layer in the light-emitting functional layer.

[0106] In some examples, as shown in FIG6 , the light-emitting functional layer 150 includes a charge generation layer 153, which is disconnected at an edge of the first partition groove 171 near the first pixel opening 131. Thus, the display substrate can prevent the charge generation layer, which has a higher conductivity in the light-emitting functional layer, from causing crosstalk between adjacent light-emitting elements.

[0107] In some examples, as shown in FIG6 , the first light-emitting layer 151 and the second light-emitting layer 152 of the light-emitting functional layer 150 are also disconnected at the edge of the first partition groove 171 near the first pixel opening 131. Due to the good isolation effect of the first partition groove 171, the two light-emitting layers of the light-emitting functional layer 150 can also be disconnected at the edge of the first partition groove near the first pixel opening. However, the embodiments of the present disclosure include but are not limited to this, and the first light-emitting layer and the second light-emitting layer in the light-emitting functional layer may not be disconnected at the location where the first partition groove is located, and only the charge generation layer may be disconnected at the location where the first partition groove is located.

[0108] In some examples, as shown in FIG6 , the second electrode 160 is also disconnected at the edge of the first partition groove 171 near the first pixel opening 131. However, embodiments of the present disclosure include but are not limited to this, and the second electrode may also be disconnected at the location where the first partition groove is located. For example, the depth or other parameters of the first partition groove may be controlled or designed to ensure that the second electrode is disconnected or not disconnected at the location where the first partition groove is located.

[0109] In some examples, the partition function layer 170 may be a newly added film layer or a flat layer in the display substrate.

[0110] For example, the material of the isolation functional layer 170 may be an organic material or an inorganic material; the organic material may include one or a combination of resin, acrylic or polyethylene terephthalate, polyimide, polyamide, polycarbonate, epoxy resin, etc., and the inorganic material may include silicon oxide, silicon nitride or silicon oxynitride, etc.

[0111] In some examples, as shown in FIG. 6 , the display substrate 100 further includes a pixel driving circuit layer 180 configured to provide a driving signal to the light emitting element 120 .

[0112] In some examples, other film layers are further provided between the isolation functional layer 170 and the base substrate 110. These other film layers may include a gate insulating layer, an interlayer insulating layer, various film layers in a pixel driving circuit layer (for example, including thin film transistors, storage capacitors, and other structures), data lines, gate lines, power signal lines, reset power signal lines, reset control signal lines, light-emitting control signal lines, and other film layers or structures.

[0113] In some examples, the base substrate 110 may be made of one or more materials selected from the group consisting of glass, polyimide, polycarbonate, polyacrylate, polyetherimide, and polyethersulfone, and this embodiment includes but is not limited thereto.

[0114] In some examples, as shown in Figure 5 , the orthographic projections of the first partition opening 132 and the second partition opening 135 on the base substrate 110 may be strip-shaped. Of course, the embodiments of the present disclosure include but are not limited to this.

[0115] For example, as shown in Figure 5, the shape of the orthographic projection of the first isolation opening 132 on the base substrate 110 has a curved portion at a position corresponding to the corner of the first pixel opening 131, and the shape of the orthographic projection of the second isolation opening 135 on the base substrate 110 has a curved portion at a position corresponding to the corner of the first pixel opening 131.

[0116] Fig. 7 is a schematic cross-sectional view of another display substrate provided by an embodiment of the present disclosure along the AB direction in Fig. 5. Compared with Fig. 6, Fig. 7 shows the structures of other light-emitting elements near the first light-emitting element 120G.

[0117] As shown in Figures 5 and 7, the plurality of light-emitting elements 120 include a second light-emitting element 120B. The pixel-defining layer 130 further includes a second pixel opening 133, which is located on a side of the first electrode 140 of the second light-emitting element 120B away from the base substrate 110 and exposes at least a portion of the first electrode 140. The light-emitting functional layer 150 of the second light-emitting element 120B is disposed in contact with the first electrode 140 through the second pixel opening 133. The second electrode 160 of the second light-emitting element 120B is located on a side of the light-emitting functional layer 150 away from the first electrode 140. The second pixel opening 133 is located on a side of the first isolating opening 132 away from the first pixel opening 131, and the second pixel-defining portion 130B is located between the first isolating opening 132 and the second pixel opening 133.

[0118] In some examples, as shown in FIG7 , the size of the second pixel defining portion 130B in the first direction is larger than the size of the first pixel defining portion 130A in the first direction. The first direction may be the direction from the first pixel opening 131 to the first isolation opening 132. Since the size of the second pixel defining portion in the first direction is larger than the size of the first pixel defining portion in the first direction, the exposure diffraction effect at the location of the first isolation opening and the exposure diffraction effect at the location of the second pixel opening cannot be superimposed on the edge of the second pixel opening, thereby not adversely affecting the edge profile of the second pixel opening. Therefore, the portion of the second pixel defining portion close to the first isolation opening may not be provided with a compensation portion similar to the first compensation portion. However, embodiments of the present disclosure include but are not limited to this, and the portion of the second pixel defining portion close to the first isolation opening may also not be provided with a compensation portion similar to the first compensation portion.

[0119] In some examples, as shown in FIG7 , the edge profile of the second pixel defining portion 130B near the second pixel opening 133 has a fifth slope angle A5, and the difference between the fifth slope angle A5 and the third slope angle A3 of the edge profile of the first pixel defining portion 130A near the first pixel opening 131 is less than 5 degrees. Due to the presence of the first compensation portion, the edge profile of the first pixel defining portion near the first pixel opening is not over-etched, and thus the slope angle difference between the edge profile of the second pixel defining portion near the second pixel opening is relatively small, thereby preventing color shift.

[0120] For example, as shown in FIG. 7 , the difference between the fifth slope angle A5 and the third slope angle A3 is less than 3 degrees, thereby further preventing color shift.

[0121] In some examples, the first light-emitting element 120G is configured to emit light of a first color, and the second light-emitting element 120B is configured to emit light of a second color.

[0122] For example, the first color may be green, and the second color may be blue. Of course, the embodiments of the present disclosure include but are not limited to this, and the first color and the second color may also be other colors.

[0123] One embodiment of the present disclosure provides another display substrate. As shown in Figures 5 and 6, the display substrate 100 includes a base substrate 110, a plurality of light-emitting elements 120, and a pixel-defining layer 130. The plurality of light-emitting elements 120 are located on the base substrate 110 and include a first light-emitting element 120G; each light-emitting element 120 includes a first electrode 140, a light-emitting functional layer 150, and a second electrode 160. The pixel-defining layer 130 includes a first pixel opening 131. The first pixel opening 131 is located on a side of the first electrode 140 of the first light-emitting element 120G away from the base substrate 110 and exposes at least a portion of the first electrode 140. The light-emitting functional layer 150 of the first light-emitting element 120G is arranged in contact with the first electrode 140 of the first light-emitting element 120G through the first pixel opening 131. The second electrode 160 of the first light-emitting element 120G is located on a side of the light-emitting functional layer 150 away from the first electrode 140. In the first light-emitting element 120G, the light-emitting functional layer 150 can realize light-emitting display under the drive of the current between the first electrode 140 and the second electrode 160. It should be noted that the light-emitting functional layer may include multiple light-emitting layers, charge generation layers, and other auxiliary functional layers that assist in light emission, such as hole transport layers and electron transport layers.

[0124] For example, the first electrode 140 can be an anode, and the second electrode 160 can be a cathode. Multiple light-emitting elements 120 can share the second electrode 160. For example, the cathode can be formed from a material with high conductivity and a low work function, such as a metal. For example, the anode can be formed from a transparent conductive material with a high work function. Of course, the embodiments of the present disclosure include but are not limited to this, and the first electrode can also be a cathode and the second electrode can be an anode.

[0125] For example, the first electrode 140 can be made of metal materials such as magnesium (Mg), silver (Ag), copper (Cu), or

[0126] Any one or more of copper (Cu), aluminum (Al), titanium (Ti) and molybdenum (Mo), or alloy materials of the above metals, such as aluminum neodymium alloy (AlNd) or molybdenum niobium alloy (MoNb), can be a single-layer structure, or a multi-layer composite structure, such as Ti / Al / Ti, etc., or a stack structure formed by metal and transparent conductive material, such as ITO / Ag / ITO, Mo / AlNd / ITO and other reflective materials.

[0127] For example, the second electrode 160 can be made of any one or more of magnesium (Mg), silver (Ag), aluminum (Al), or an alloy made of any one or more of the above metals, or a transparent conductive material, such as indium tin oxide (ITO), or a multilayer composite structure of metal and transparent conductive material.

[0128] As shown in Figure 6, the pixel-defining layer 130 also includes a first isolation opening 132, which is located around the first pixel opening 131 and is configured to expose the pixel isolation structure. In this case, the pixel-defining layer 130 includes a first pixel-defining portion 130A located between the first pixel opening 131 and the first isolation opening 132, and a second pixel-defining portion 130B located away from the first pixel opening 131 at the first isolation opening 132. The first pixel-defining portion 130A covers the edge of the first electrode 140 of the first light-emitting element 120G and can limit the light emission angle of the first light-emitting element 120G. The second pixel-defining portion 130B covers the edge of the light-emitting element adjacent to the first light-emitting element 120G and can limit the light emission angle of the light-emitting element.

[0129] As shown in FIG6 , the edge profile of the first pixel-defining portion 130A near the first partition opening 132 has a first slope angle A1, and the edge profile of the second pixel-defining portion 130B near the first partition opening 132 has a second slope angle A2. The difference between the first slope angle A1 and the second slope angle A2 ranges from 0 to 40 degrees. It should be noted that the aforementioned slope angles may be the angles between the bottom surface of the pixel-defining portion and a tangent line passing through a point on the edge of the outline and tangent to the outline.

[0130] For example, as shown in FIG6 , the first slope angle A1 is greater than the second slope angle A2 , and the difference between the first slope angle A1 and the second slope angle A2 ranges from 20 to 40 degrees.

[0131] In the display substrate provided by the embodiment of the present disclosure, since the first slope angle of the edge profile of the first pixel defining portion close to the first isolation opening is greater than the second slope angle of the edge profile of the second pixel defining portion close to the first isolation opening, the edge profile of the first pixel defining portion close to the first isolation opening can play a certain light-blocking role during the exposure process, so as to alleviate or even eliminate the adverse effects of the exposure diffraction effect on the first pixel defining portion, thereby avoiding excessive thinning of the first pixel defining portion next to the first isolation opening, thereby avoiding dark spots and other defects caused by the first pixel defining portion being unable to completely cover the edge of the first electrode, and also making the slope angle of the edge profile of the first pixel defining portion close to the first pixel opening relatively consistent with the slopes of the edges of other pixel openings, thereby avoiding color deviation.

[0132] FIG8 is a schematic plan view of another display substrate provided in accordance with an embodiment of the present disclosure; FIG9 is a schematic cross-sectional view of a display substrate along the CD direction in FIG8 provided in accordance with an embodiment of the present disclosure.

[0133] As shown in Figures 8 and 9, the display substrate 100 includes a base substrate 110, a plurality of light-emitting elements 120, and a pixel defining layer 130. The plurality of light-emitting elements 120 are located on the base substrate 110 and include a first light-emitting element 120G; each light-emitting element 120 includes a first electrode 140, a light-emitting functional layer 150, and a second electrode 160.

[0134] As shown in Figures 8 and 9, the pixel defining layer 130 includes a first pixel opening 131 and a second pixel opening 133; the first pixel opening 131 is located on a side of the first electrode 140 of the first light-emitting element 120G away from the substrate 110, and exposes at least a portion of the first electrode 140, the light-emitting function layer 150 of the first light-emitting element 120G is arranged in contact with the first electrode 140 of the first light-emitting element 120G through the first pixel opening 131, and the second electrode 160 of the first light-emitting element 120G is located on a side of the light-emitting function layer 150 away from the first electrode 140; the second pixel opening 133 The first electrode 140 of the second light-emitting element 120B is located on a side away from the substrate 110, and at least a portion of the first electrode 140 is exposed. The light-emitting functional layer 150 of the second light-emitting element 120B is arranged in contact with the first electrode 140 through the second pixel opening 133. The second electrode 160 of the second light-emitting element 120B is located on a side of the light-emitting functional layer 150 away from the first electrode 140. In the first light-emitting element 120G and the second light-emitting element 120B, the light-emitting functional layer 150 can achieve light-emitting display under the drive of the current between the first electrode 140 and the second electrode 160. It should be noted that the light-emitting functional layer may include multiple light-emitting layers, a charge generation layer, and other auxiliary functional layers that assist in light emission, such as a hole transport layer and an electron transport layer.

[0135] For example, the first electrode 140 can be an anode, and the second electrode 160 can be a cathode. Multiple light-emitting elements 120 can share the second electrode 160. For example, the cathode can be formed from a material with high conductivity and a low work function, such as a metal. For example, the anode can be formed from a transparent conductive material with a high work function. Of course, the embodiments of the present disclosure include but are not limited to this, and the first electrode can also be a cathode and the second electrode can be an anode.

[0136] As shown in Figures 8 and 9, the pixel-defining layer 130 further includes a first isolation opening 132, located between the first pixel opening 131 and the second pixel opening 133, and configured to expose the pixel isolation structure. In this case, the pixel-defining layer 130 includes a first pixel-defining portion 130A located between the first pixel opening 131 and the first isolation opening 132, and a second pixel-defining portion 130B located away from the first pixel opening 131 on the first isolation opening 132. The first pixel-defining portion 130A covers the edge of the first electrode 140 of the first light-emitting element 120G and can limit the light emission angle of the first light-emitting element 120G. The second pixel-defining portion 130B covers the edge of the first electrode 140 of the second light-emitting element 120B and can limit the light emission angle of the second light-emitting element 120B.

[0137] As shown in Figure 9, the first pixel defining portion 130A includes a connected first main body portion 1301 and a first compensation portion 1302. The first compensation portion 1302 is located on a side of the first main body portion 1301 close to the first isolation opening 132. The first compensation portion 1302 has a first protruding profile 191 that protrudes from the top of the first main body portion 1301 in a direction away from the base substrate 110, so that the maximum height of the first compensation portion 1302 is greater than the maximum height of the first main body portion 1301.

[0138] As shown in Figure 9, the second pixel defining portion 130B includes a connected second main body portion 1303 and a second compensation portion 1304. The second compensation portion 1304 is located on a side of the second main body portion 1303 close to the first isolation opening 132. The second compensation portion 1304 has a second raised profile 192 that protrudes from the top of the second main body portion 1303 in a direction away from the base substrate 110, so that the maximum height of the second compensation portion 1304 is greater than the maximum height of the second main body portion 1303.

[0139] In the display substrate provided in the embodiments of the present disclosure, the first pixel defining portion includes a first compensation portion, and the second pixel defining portion includes a second compensation portion. The first compensation portion has a first raised profile that protrudes from the top of the first main portion away from the base substrate, such that the maximum height of the first compensation portion is greater than the maximum height of the first main portion. The second compensation portion has a second raised profile that protrudes from the top of the second main portion away from the base substrate, such that the maximum height of the second compensation portion is greater than the maximum height of the second main portion. Therefore, the first and second compensation portions can serve to block light during exposure, thereby alleviating or even eliminating the adverse effects of exposure diffraction on the first and second pixel defining portions. This prevents excessive thinning of the first and second pixel defining portions adjacent to the first isolation opening, thereby avoiding defects such as dark spots caused by the first and second pixel defining portions not fully covering the edge of the first electrode. Furthermore, the slope angle of the edge profile of the first pixel defining portion near the first pixel opening and the slope angle of the edge profile of the second pixel defining portion near the second pixel opening remain relatively consistent with the slopes of the edges of other pixel openings, thereby preventing color shift.

[0140] In the display substrate provided by the embodiment of the present disclosure, the second compensation portion 1304 may also be reused as a spacer.

[0141] For example, the maximum height of the second main portion 1303 may range from 0 to 0.8 micrometers. In this case, the maximum height of the second compensation portion 1304 in a direction perpendicular to the base substrate 110 may range from 0.9 to 1.3 micrometers.

[0142] For example, the difference between the maximum height of the second compensation portion 1304 and the maximum height of the second main body portion 1303 ranges from 0.1 to 0.5 micrometers.

[0143] For example, the difference between the maximum height of the second compensation portion 1304 and the maximum height of the second main portion 1303 is 0.25 micrometers.

[0144] In some examples, as shown in FIG8 , the first compensation portion 1302 and the second compensation portion 1304 are connected at two opposing edges of the first isolation opening 132 in the second direction to surround the first isolation opening 132, thereby forming a compensation ring. The second direction is perpendicular to the direction from the first pixel opening 131 to the first isolation opening 132, that is, the second direction and the first direction are mutually perpendicular. Thus, the edges of the first isolation opening are all provided with compensation portions, thereby maximally blocking the exposure diffraction effect at the location of the first isolation opening. Of course, the embodiments of the present disclosure include but are not limited to this, and the above-mentioned compensation ring may not be formed, and compensation portions may only be provided at two opposing edges of the first isolation opening in the first direction.

[0145] 9 , one end of the second raised profile 192 is located at the top of the second main body portion 1303, and the other end of the second raised profile 192 is located at the edge of the first partition opening 132. Along the direction from the second pixel opening 133 to the first partition opening 132, the distance between the second raised profile 192 and the base substrate 110 first increases and then decreases.

[0146] In some examples, as shown in FIG9 , the second raised profile 192 and the second main body portion 1303 are away from the upper surface of the base substrate 110 at an inflection point, and the angle between a tangent line passing through the inflection point and tangent to the second raised profile 192 and a tangent line passing through the inflection point and tangent to the upper surface is less than 180 degrees.

[0147] In some examples, as shown in FIG9 , the edge profile of the first pixel-defining portion 130A near the first partition opening 132 has a first slope angle A1, and the edge profile of the second pixel-defining portion 130B near the first partition opening 132 has a second slope angle A2. The first slope angle A1 and the second slope angle A2 are substantially equal. For example, the difference between the first slope angle A1 and the second slope angle A2 is less than 5 degrees. It should be noted that the aforementioned slope angles may be the angles between the bottom surface of the pixel-defining portion and a tangent line passing through a point on the edge of the outline and being tangent to the outline.

[0148] In some examples, as shown in FIG. 9 , an edge profile of the first pixel defining portion 130A near the first pixel opening 131 has a third slope angle A3 , and a difference between the third slope angle A3 and the first slope angle A1 ranges from 20 to 40 degrees.

[0149] In some examples, as shown in FIG. 9 , an edge profile of the second pixel defining portion 130B near the second pixel opening 133 has a fifth slope angle A5 , and a difference between the fifth slope angle A5 and the second slope angle A2 ranges from 20 to 40 degrees.

[0150] In some examples, as shown in FIG. 9 , the difference between the third slope angle A3 and the fifth slope angle A5 is less than 5 degrees.

[0151] In some examples, as shown in FIG9 , the first raised profile 191 has a fourth slope angle A4 on one side close to the first main body portion 1301 . The fourth slope angle A4 has a value range of 0 to 20 degrees, and may be 5 to 10 degrees.

[0152] In some examples, as shown in FIG. 9 , a side of the second raised profile 192 close to the second main body portion 1303 has a sixth slope angle A6 . The sixth slope angle A6 has a value range of 0 to 20 degrees, and may be 5 to 10 degrees.

[0153] In some examples, as shown in FIG. 9 , the display substrate 100 further includes a pixel driving circuit layer 180 configured to provide a driving signal to the light emitting element 120 .

[0154] In some examples, other film layers are further provided between the isolation functional layer 170 and the base substrate 110. These other film layers may include a gate insulating layer, an interlayer insulating layer, various film layers in a pixel driving circuit layer (for example, including thin film transistors, storage capacitors, and other structures), data lines, gate lines, power signal lines, reset power signal lines, reset control signal lines, light-emitting control signal lines, and other film layers or structures.

[0155] FIG10 is a schematic cross-sectional view of a display substrate provided by an embodiment of the present disclosure, taken along the direction EF in FIG8 . As shown in FIG10 , the plurality of light-emitting elements 120 include a third light-emitting element 120R, and the pixel-defining layer 130 further includes a third pixel opening 134. The third pixel opening 134 is located on a side of the first electrode 140 of the third light-emitting element 120R that is away from the base substrate 110, and exposes at least a portion of the first electrode 140. The light-emitting functional layer 150 of the second light-emitting element 120R is disposed in contact with the first electrode 140 through the third pixel opening 134, and the second electrode 160 of the second light-emitting element 120R is located on a side of the light-emitting functional layer 150 that is away from the first electrode 140. In the first light-emitting element 120R, the current between the first electrode 140 and the second electrode 160 can drive the light-emitting functional layer 150 to emit light.

[0156] As shown in FIG10 , the pixel-defining layer 130 further includes a second isolation opening 135 located between the first pixel opening 131 and the third pixel opening 134. The second isolation opening 135 is configured to expose the pixel isolation structure located between the first pixel opening 131 and the third pixel opening 134. The pixel-defining layer 130 includes a third pixel-defining portion 130C located between the first pixel opening 131 and the second isolation opening 135, and a fourth pixel-defining portion 130D located between the second isolation opening 135 and the third pixel opening 134. The third pixel-defining portion 130C covers the edge of the first electrode 140 of the first light-emitting element 120G to define the light emission angle of the first light-emitting element 120G together with the first pixel-defining portion 130A. The fourth pixel-defining portion 130D covers the edge of the first electrode 140 of the third light-emitting element 120R to define the light emission angle of the third light-emitting element 120R.

[0157] As shown in Figure 10, the third pixel defining portion 130C includes a connected third main portion 1305 and a third compensation portion 1306, and the third compensation portion 1306 is located on the side of the third main portion 1305 close to the second isolation opening 135. The third compensation portion 1306 has a third protruding profile 193 that protrudes from the top of the third main portion 1305 in a direction away from the base substrate 110, so that the maximum height of the third compensation portion 1306 is greater than the maximum height of the third main portion 1305.

[0158] In this example, the third compensation portion can play a certain light-blocking role during the exposure process to alleviate or even eliminate the adverse effects of the exposure diffraction effect at the location of the second isolation opening on the third pixel-defining portion, thereby avoiding excessive thinning of the third pixel-defining portion next to the second isolation opening, thereby avoiding dark spots and other defects caused by the third pixel-defining portion being unable to completely cover the edge of the first electrode, and also ensuring that the slope angle of the edge contour of the third pixel-defining portion close to the first pixel opening remains relatively consistent with the slope angle of the edge contour of other pixel-defining portions, thereby avoiding color deviation.

[0159] In the display substrate provided in the embodiment of the present disclosure, the third compensation portion 1306 can also be reused as a spacer. For example, the maximum height of the third main portion 1305 can range from 0 to 0.8 microns. In this case, the maximum height of the third compensation portion 1306 in a direction perpendicular to the base substrate 110 ranges from 0.9 to 1.3 microns. As shown in FIG10 , the fourth pixel defining portion 130D includes a fourth main portion 1307 and a fourth compensation portion 1308 connected to each other. The fourth compensation portion 1308 is located on a side of the fourth main portion 1307 near the second isolation opening 135. The fourth compensation portion 1308 has a fourth raised profile 194 that protrudes from the top of the fourth main portion 1307 away from the base substrate 110, such that the maximum height of the fourth compensation portion 1308 is greater than the maximum height of the fourth main portion 1307.

[0160] In this example, the fourth compensation portion can play a certain light-blocking role during the exposure process to alleviate or even eliminate the adverse effects of the exposure diffraction effect at the location of the second isolation opening on the fourth pixel-defining portion, thereby avoiding excessive thinning of the fourth pixel-defining portion next to the second isolation opening, thereby avoiding dark spots and other defects caused by the fourth pixel-defining portion being unable to completely cover the edge of the first electrode, and also ensuring that the slope angle of the edge contour of the fourth pixel-defining portion close to the third pixel opening remains relatively consistent with the slope angle of the edge contour of other pixel-defining portions, thereby avoiding color deviation.

[0161] In the display substrate provided in the embodiment of the present disclosure, the fourth compensation portion 1308 can also be reused as a spacer. For example, the maximum height of the fourth main portion 1307 can range from 0 to 0.8 microns. In this case, the maximum height of the fourth compensation portion 1308 in a direction perpendicular to the base substrate 110 ranges from 0.9 to 1.3 microns.

[0162] 10 , one end of the third raised profile 193 is located at the top of the third main body portion 1305, and the other end of the third raised profile 193 is located at the edge of the second partition opening 135. Along the direction from the first pixel opening 131 to the second partition opening 135, the distance between the third raised profile 193 and the base substrate 110 first increases and then decreases.

[0163] In some examples, as shown in FIG10 , the third raised profile 193 and the third main body portion 1305 are away from the upper surface of the base substrate 110 at an inflection point, and the angle between a tangent line passing through the inflection point and tangent to the third raised profile 193 and a tangent line passing through the inflection point and tangent to the upper surface is less than 180 degrees.

[0164] 10 , one end of the fourth raised profile 194 is located at the top of the fourth main body portion 1307, and the other end of the fourth raised profile 194 is located at the edge of the second partition opening 135. Along the direction from the third pixel opening 134 to the second partition opening 135, the distance between the fourth raised profile 194 and the base substrate 110 first increases and then decreases.

[0165] In some examples, as shown in FIG10 , the fourth raised profile 194 and the fourth main body portion 1307 are away from the upper surface of the base substrate 110 at an inflection point, and the angle between a tangent line passing through the inflection point and tangent to the fourth raised profile 194 and a tangent line passing through the inflection point and tangent to the upper surface is less than 180 degrees.

[0166] In some examples, the first light-emitting element 120G is configured to emit light of a first color, the second light-emitting element 120B is configured to emit light of a second color, and the third light-emitting element 120R is configured to emit light of a third color.

[0167] For example, the first color may be green, the second color may be blue, and the third color may be red. Of course, the embodiments of the present disclosure include but are not limited to this, and the first color, the second color, and the third color may also be other colors.

[0168] In some examples, as shown in FIG10 , the display substrate 100 further includes a blocking functional layer 170, which is positioned perpendicularly to the base substrate 110 between the base substrate 110 and the plurality of light-emitting elements 120. The blocking functional layer 170 includes a second blocking groove 172 configured to at least block the charge generation layer in the light-emitting functional layer. The orthographic projection of the second blocking opening 135 on the base substrate 110 covers the edge of the second blocking groove 172 near the first pixel opening 131. Thus, the second blocking opening can expose the second blocking groove, preventing it from being covered by the pixel-defining layer. Furthermore, the second blocking opening can also increase the step difference, thereby better blocking the charge generation layer in the light-emitting functional layer.

[0169] In some examples, as shown in FIG10 , the light-emitting functional layer 150 includes a charge generation layer 153, which is disconnected at an edge of the second partition groove 172 near the first pixel opening 131. Thus, the display substrate can prevent the charge generation layer, which has a higher conductivity in the light-emitting functional layer, from causing crosstalk between adjacent light-emitting elements.

[0170] In some examples, as shown in FIG10 , the first light-emitting layer 151 and the second light-emitting layer 152 of the light-emitting functional layer 150 are also disconnected at the edge of the second partition groove 172 near the first pixel opening 131. Due to the good partitioning effect of the second partition groove 172, the two light-emitting layers of the light-emitting functional layer 150 can also be disconnected at the edge of the second partition groove near the first pixel opening. However, the embodiments of the present disclosure include but are not limited to this, and the first light-emitting layer and the second light-emitting layer in the light-emitting functional layer may not be disconnected at the location where the second partition groove is located, and only the charge generation layer may be disconnected at the location where the second partition groove is located.

[0171] In some examples, as shown in FIG10 , the second electrode 160 is also disconnected at the edge of the second partitioning groove 172 near the first pixel opening 131. However, embodiments of the present disclosure include but are not limited to this, and the second electrode may also be disconnected at the location where the second partitioning groove is located. For example, the depth or other parameters of the second partitioning groove may be controlled or designed to ensure that the second electrode is disconnected or not disconnected at the location where the first partitioning groove is located.

[0172] In some examples, as shown in Figure 8 , the orthographic projections of the first partition opening 132 and the second partition opening 135 on the base substrate 110 may be strip-shaped. Of course, the embodiments of the present disclosure include but are not limited to this.

[0173] For example, as shown in Figure 8, the shape of the orthographic projection of the first isolation opening 132 on the base substrate 110 has a curved portion at a position corresponding to the corner of the first pixel opening 131, and the shape of the orthographic projection of the second isolation opening 135 on the base substrate 110 has a curved portion at a position corresponding to the corner of the first pixel opening 131.

[0174] FIG11 is a schematic plan view of another display substrate provided in accordance with an embodiment of the present disclosure; FIG12 is a schematic cross-sectional view of a display substrate provided in accordance with an embodiment of the present disclosure along the GH direction in FIG11 .

[0175] As shown in Figures 11 and 12, the display substrate 100 includes a base substrate 110, a plurality of light-emitting elements 120, and a pixel defining layer 130. The plurality of light-emitting elements 120 are located on the base substrate 110 and include a first light-emitting element 120G; each light-emitting element 120 includes a first electrode 140, a light-emitting functional layer 150, and a second electrode 160.

[0176] As shown in Figures 11 and 12, the pixel defining layer 130 includes a first pixel opening 131 and a second pixel opening 133; the first pixel opening 131 is located on a side of the first electrode 140 of the first light-emitting element 120G away from the substrate 110, and exposes at least a portion of the first electrode 140, the light-emitting function layer 150 of the first light-emitting element 120G is in contact with the first electrode 140 of the first light-emitting element 120G through the first pixel opening 131, and the second electrode 160 of the first light-emitting element 120G is located on a side of the light-emitting function layer 150 away from the first electrode 140; the second pixel opening 133 33 is located on the side of the first electrode 140 of the second light-emitting element 120B away from the substrate 110, and at least a portion of the first electrode 140 is exposed. The light-emitting functional layer 150 of the second light-emitting element 120B is arranged in contact with the first electrode 140 through the second pixel opening 133. The second electrode 160 of the second light-emitting element 120B is located on the side of the light-emitting functional layer 150 away from the first electrode 140. In the first light-emitting element 120G and the second light-emitting element 120B, the light-emitting functional layer 150 can achieve light-emitting display under the drive of the current between the first electrode 140 and the second electrode 160. It should be noted that the above-mentioned light-emitting functional layer may include multiple light-emitting layers, charge generation layers, and other auxiliary functional layers that assist in light emission, such as hole transport layers and electron transport layers.

[0177] For example, the first electrode 140 can be an anode, and the second electrode 160 can be a cathode. Multiple light-emitting elements 120 can share the second electrode 160. For example, the cathode can be formed from a material with high conductivity and a low work function, such as a metal. For example, the anode can be formed from a transparent conductive material with a high work function. Of course, the embodiments of the present disclosure include but are not limited to these. Alternatively, the first electrode can be a cathode, and the second electrode can be an anode.

[0178] As shown in Figures 11 and 12, the pixel-defining layer 130 further includes a first isolation opening 132, located between the first pixel opening 131 and the second pixel opening 133, and configured to expose the pixel isolation structure. In this case, the pixel-defining layer 130 includes a first pixel-defining portion 130A located between the first pixel opening 131 and the first isolation opening 132, and a second pixel-defining portion 130B located away from the first pixel opening 131 on the first isolation opening 132. The first pixel-defining portion 130A covers the edge of the first electrode 140 of the first light-emitting element 120G and can limit the light emission angle of the first light-emitting element 120G. The second pixel-defining portion 130B covers the edge of the first electrode 140 of the second light-emitting element 120B and can limit the light emission angle of the second light-emitting element 120B.

[0179] As shown in Figure 12, the first pixel defining portion 130A includes a connected first main body portion 1301 and a first compensation portion 1302. The first compensation portion 1302 is located on a side of the first main body portion 1301 close to the first isolation opening 132. The first compensation portion 1302 has a first protruding profile 191 that protrudes from the top of the first main body portion 1301 in a direction away from the base substrate 110, so that the maximum height of the first compensation portion 1302 is greater than the maximum height of the first main body portion 1301.

[0180] As shown in Figure 12, the second pixel defining portion 130B includes a connected second main body portion 1303 and a second compensation portion 1304. The second compensation portion 1304 is located on a side of the second main body portion 1303 close to the first isolation opening 132. The second compensation portion 1304 has a second raised profile 192 that protrudes from the top of the second main body portion 1303 in a direction away from the base substrate 110, so that the maximum height of the second compensation portion 1304 is greater than the maximum height of the second main body portion 1303.

[0181] In the display substrate provided in the embodiments of the present disclosure, the first pixel defining portion includes a first compensation portion, and the second pixel defining portion includes a second compensation portion. The first compensation portion has a first raised profile that protrudes from the top of the first main portion away from the base substrate, such that the maximum height of the first compensation portion is greater than the maximum height of the first main portion. The second compensation portion has a second raised profile that protrudes from the top of the second main portion away from the base substrate, such that the maximum height of the second compensation portion is greater than the maximum height of the second main portion. Therefore, the first and second compensation portions can serve to block light during exposure, thereby alleviating or even eliminating the adverse effects of exposure diffraction on the first and second pixel defining portions. This prevents excessive thinning of the first and second pixel defining portions adjacent to the first isolation opening, thereby avoiding defects such as dark spots caused by the first and second pixel defining portions not fully covering the edge of the first electrode. Furthermore, the slope angle of the edge profile of the first pixel defining portion near the first pixel opening and the slope angle of the edge profile of the second pixel defining portion near the second pixel opening remain relatively consistent with the slopes of the edges of other pixel openings, thereby preventing color shift.

[0182] As shown in FIG. 12 , since the first pixel defining portion 130A is provided with the first compensation portion 1302 and the second pixel defining portion 130B is provided with the second compensation portion 1304 , the width of the second pixel defining portion 130B can be reduced, thereby increasing the arrangement density of the pixel openings.

[0183] In some examples, as shown in FIG12 , the size of the second pixel defining portion 130B in the first direction is equal to the size of the first pixel defining portion 130A in the first direction. The first direction is the direction from the first pixel opening 131 to the first isolation opening 132, and the first direction is parallel to the base substrate 110. As a result, the structures of the first pixel defining portion and the second pixel defining portion are more symmetrical, thereby minimizing the difference in slope angle between the edge profile of the first pixel defining portion near the first pixel opening and the edge profile of the second pixel defining portion near the second pixel opening.

[0184] In some examples, as shown in Figure 11 , the orthographic projections of the first partition opening 132 and the second partition opening 135 on the base substrate 110 may be strip-shaped. Of course, the embodiments of the present disclosure include but are not limited to this.

[0185] For example, as shown in Figure 11, the shape of the orthographic projection of the first isolation opening 132 on the base substrate 110 has a curved portion at a position corresponding to the corner of the first pixel opening 131, and the shape of the orthographic projection of the second isolation opening 135 on the base substrate 110 has a curved portion at a position corresponding to the corner of the first pixel opening 131.

[0186] FIG13 is a schematic plan view of another display substrate provided in accordance with an embodiment of the present disclosure. As shown in FIG13 , the pixel-defining layer 130 includes a first pixel opening 131, a first isolation opening 132, a second pixel opening 133, a third pixel opening 134, and a second isolation opening 135. A first pixel-defining portion 130A located between the first pixel opening 131 and the first isolation opening 132 is provided with the aforementioned first compensation portion 1302. However, a second pixel-defining portion 130B located between the first isolation opening 132 and the second pixel opening 133, a third pixel-defining portion 130C located between the first pixel opening 131 and the second isolation opening 135, and a fourth pixel-defining portion 130D located between the third pixel opening 134 and the second isolation opening 135 are not provided with compensation portions.

[0187] Figures 14A-14C are schematic plan views of several other display substrates provided in one embodiment of the present disclosure. As shown in Figures 14A-14C , the orthographic projection of the first partition opening 132 onto the base substrate 110 can be a bar, while the orthographic projection of the second partition opening 135 onto the base substrate 110 can be an L-shape. Of course, the embodiments of the present disclosure include but are not limited to these.

[0188] In some examples, as shown in FIG14A , the periphery of the first isolating opening 132 and the second isolating opening 135 may adopt a compensation ring design. For details, please refer to the relevant description of the embodiment shown in FIG8 , which will not be repeated here. As shown in FIG14B , the periphery of the first isolating opening 132 and the second isolating opening 135 may adopt a single-sided compensation design or a double-sided compensation design. For details, please refer to the relevant description of the embodiment shown in FIG5 , which will not be repeated here. As shown in FIG14C , the periphery of the first isolating opening 132 may adopt a double-sided compensation design, while the periphery of the second isolating opening 135 does not adopt a compensation design. Therefore, the display substrate provided in the embodiment of the present disclosure can choose which of the above-mentioned compensation designs to adopt based on actual needs or the location of the light-emitting element where a defect occurs in the product.

[0189] An embodiment of the present disclosure further provides a display device. FIG15 is a schematic diagram of a display device provided by an embodiment of the present disclosure. As shown in FIG15 , the display device 500 includes the display substrate 100 described above. Thus, the display device can prevent the first pixel defining portion adjacent to the first isolation opening from being excessively thinned, thereby preventing defects such as dark spots caused by the first pixel defining portion not being able to completely cover the edge of the first electrode. Furthermore, the slope angle of the edge profile of the first pixel defining portion near the first pixel opening remains relatively consistent with the slope angle of the edges of other pixel openings, thereby avoiding color shift.

[0190] In addition, the display device can also implement a double-layer EL (Tandem EL) design, thus having advantages such as long life, low power consumption, and high brightness. Furthermore, the display device can also avoid crosstalk between adjacent light-emitting elements.

[0191] For example, the display device can be a display device such as an organic light emitting diode display device, as well as any product or component with a display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, navigator, etc. that includes the display device, but this embodiment is not limited to this.

[0192] An embodiment of the present disclosure further provides a method for manufacturing a display substrate. FIG16 is a flow chart of a method for manufacturing a display substrate provided in an embodiment of the present disclosure. As shown in FIG16 , the method for manufacturing a display substrate includes the following steps S101-S104.

[0193] Step S101: forming a first electrode on a base substrate.

[0194] For example, a conductive material layer for forming the first electrode may be formed on the base substrate, and then the first electrode may be formed through a patterning process.

[0195] For example, the substrate may be made of one or more materials selected from the group consisting of glass, polyimide, polycarbonate, polyacrylate, polyetherimide, and polyethersulfone, and this embodiment includes but is not limited to these.

[0196] For example, the first electrode can be made of a metal material, such as any one or more of magnesium (Mg), silver (Ag), copper (Cu), aluminum (Al), titanium (Ti) and molybdenum (Mo), or an alloy material of the above metals, such as aluminum neodymium alloy (AlNd) or molybdenum niobium alloy (MoNb). It can be a single-layer structure, or a multi-layer composite structure, such as Ti / Al / Ti, etc., or a stack structure formed by metal and transparent conductive material, such as ITO / Ag / ITO, Mo / AlNd / ITO and other reflective materials.

[0197] Step S102: forming a pixel defining layer on a side of the first electrode away from the base substrate.

[0198] For example, a material layer for forming a pixel defining layer may be formed on a side of the first electrode away from the base substrate by a coating process, and then the material layer may be patterned by a patterning process to form the pixel defining layer.

[0199] For example, the pixel defining layer may be made of a photosensitive material, such as a photosensitive resin, so that the pixel defining layer can be patterned simply through an exposure process.

[0200] Step S103: forming a light-emitting functional layer on a side of the pixel defining layer away from the first electrode.

[0201] Step S104: forming a second electrode on a side of the light-emitting functional layer away from the base substrate. The first electrode, the second electrode and the light-emitting functional layer between the first electrode and the second electrode can form a light-emitting element.

[0202] In the manufacturing method of the display substrate, the display substrate includes a plurality of light-emitting elements, each light-emitting element includes a first electrode, a light-emitting functional layer and a second electrode, and the plurality of light-emitting elements includes a first light-emitting element; a pixel defining layer includes a first pixel opening and a first isolation opening, the first pixel opening is located on a side of the first electrode of the first light-emitting element away from the base substrate and exposes at least a portion of the first electrode, the first isolation opening is located around the first pixel opening, the pixel defining layer includes a first pixel defining portion located between the first pixel opening and the first isolation opening and a second pixel defining portion located on a side of the first isolation opening away from the first pixel opening, the first pixel defining portion includes a connected first main portion and a first compensation portion, the first compensation portion is located on a side of the first main portion close to the first isolation opening, and the first compensation portion has a first protruding profile protruding from the top of the first main portion toward a direction away from the base substrate, so that the maximum height of the first compensation portion is greater than the maximum height of the first main portion.

[0203] In the method for manufacturing a display substrate provided in an embodiment of the present disclosure, in the step of forming a pixel defining layer on a side of the first electrode away from the base substrate, since the first pixel defining portion includes a first compensation portion, and the first compensation portion has a first raised profile that protrudes from the top of the first main portion in a direction away from the base substrate, so that the maximum height of the first compensation portion is greater than the maximum height of the first main portion, the first compensation portion can play a certain light-blocking role during the exposure process, thereby alleviating or even eliminating the adverse effects of the exposure diffraction effect on the first pixel defining portion, thereby avoiding excessive thinning of the first pixel defining portion adjacent to the first isolation opening, thereby avoiding dark spots and other defects caused by the first pixel defining portion not being able to completely cover the edge of the first electrode, and also ensuring that the slope angle of the edge profile of the first pixel defining portion near the first pixel opening remains relatively consistent with the slope angle of the edges of other pixel openings, thereby avoiding color shift.

[0204] For example, the light-emitting functional layer may include multiple sub-functional layers; for example, the light-emitting functional layer includes a first light-emitting layer, a second light-emitting layer, and a charge generation layer located between the first light-emitting layer and the second light-emitting layer. The charge generation layer has strong conductivity, which can make the light-emitting functional layer have the advantages of long life, low power consumption and high brightness. For example, compared with the light-emitting functional layer without a charge generation layer, the first light-emitting element can increase the luminous brightness by nearly double by setting a charge generation layer in the light-emitting functional layer. At the same time, since the pixel defining layer is provided with a first isolation opening, and a pixel isolation structure is provided below the first isolation opening, the charge generation layer is disconnected at the position where the pixel isolation structure is located in the first isolation opening. Therefore, the manufacturing method of the display substrate can avoid the crosstalk between adjacent light-emitting elements caused by the charge generation layer with higher conductivity in the light-emitting functional layer.

[0205] In some examples, forming a pixel-defining layer on a side of the first electrode away from the substrate includes: forming a pixel-defining material layer on a side of the first electrode away from the substrate; and patterning the pixel-defining material layer using a halftone mask to form a first pixel opening, a first isolation opening, a first pixel-defining portion, and a second pixel-defining portion, wherein the first main portion of the first pixel-defining portion corresponds to a partially transparent portion of the halftone mask, and the first compensation portion corresponds to a completely blocking portion of the halftone mask. Of course, embodiments of the present disclosure include but are not limited to this, and the pixel-defining layer may also be formed using two masks and a double exposure process.

[0206] In some examples, the method for manufacturing a display substrate further includes: forming a blocking functional layer on the base substrate before forming the first electrode on the base substrate; the blocking functional layer includes a first blocking groove configured to at least block the charge generation layer in the light-emitting functional layer; and the orthographic projection of the first blocking opening on the base substrate covers an edge of the first blocking groove near the first pixel opening. Thus, the first blocking opening can expose the first blocking groove, preventing it from being covered by the pixel-defining layer. Furthermore, the first blocking opening can increase the step difference, thereby better blocking the charge generation layer in the light-emitting functional layer.

[0207] In some examples, the partition function layer may be a newly added film layer or a flat layer in the display substrate.

[0208] For example, the material of the isolation functional layer may be an organic material or an inorganic material; the organic material may include one or a combination of resin, acrylic or polyethylene terephthalate, polyimide, polyamide, polycarbonate, epoxy resin, etc., and the inorganic material may include silicon oxide, silicon nitride or silicon oxynitride, etc.

[0209] In some examples, before forming the isolation functional layer on the base substrate, the method for manufacturing the display substrate further includes forming a pixel driving circuit on the base substrate; each pixel driving circuit may include multiple transistors and at least one storage capacitor, for example, the pixel circuit may adopt a 2T1C, 3T1C or 7T1C design.

[0210] For example, the step of forming a pixel driving circuit may include sequentially depositing a first insulating film and an active layer film on a base substrate, patterning the active layer film through a patterning process to form a first insulating layer covering the entire base substrate, and an active layer pattern arranged on the first insulating layer, wherein the active layer pattern includes at least an active layer.

[0211] For example, the step of forming a pixel driving circuit may also include: depositing a second insulating film and a first metal film in sequence on a side of the active layer away from the base substrate, patterning the first metal film through a patterning process to form a second insulating layer covering the active layer pattern, and a first gate metal layer pattern arranged on the second insulating layer, the first gate metal layer pattern including at least a gate electrode and a first capacitor electrode.

[0212] For example, the step of forming a pixel driving circuit may also include: depositing a third insulating film and a second metal film in sequence on a side of the first gate metal pattern away from the base substrate, patterning the second metal film through a patterning process to form a third insulating layer covering the first gate metal layer, and a second gate metal layer pattern arranged on the third insulating layer, the second gate metal layer pattern including at least a second capacitor electrode, and the position of the second capacitor electrode corresponding to the position of the first capacitor electrode.

[0213] For example, the step of forming a pixel driving circuit may also include: depositing a fourth insulating film, patterning the fourth insulating film through a patterning process to form a fourth insulating layer covering the second gate metal layer, at least two first via holes being opened on the fourth insulating layer, and the fourth insulating layer, the third insulating layer and the second insulating layer in the two first via holes being etched away to expose the surface of the active layer of the active layer pattern.

[0214] For example, the step of forming the pixel driving circuit may further include: depositing a third metal film, patterning the third metal film through a patterning process, and forming a source-drain metal layer pattern on the fourth insulating layer, wherein the source-drain metal layer pattern includes at least a source electrode and a drain electrode located in the display area. The source electrode and the drain electrode may be respectively connected to the active layer in the active layer pattern through a first via hole.

[0215] For example, the first insulating layer, the second insulating layer, the third insulating layer, and the fourth insulating layer may be made of any one or more of silicon oxide (SiOx), silicon nitride (SiNx), and silicon oxynitride (SiON), and may be a single layer, a multilayer, or a composite layer. The first insulating layer may be a buffer layer for improving the water and oxygen resistance of the substrate; the second insulating layer and the third insulating layer may be gate insulator (GI) layers; and the fourth insulating layer may be an interlayer dielectric (ILD) layer. The first metal film, the second metal film, and the third metal film may be made of metal materials, such as any one or more of silver (Ag), copper (Cu), aluminum (Al), titanium (Ti), and molybdenum (Mo), or alloy materials of the above metals, such as aluminum neodymium alloy (AlNd) or molybdenum niobium alloy (MoNb), and may be a single layer structure or a multilayer composite structure, such as Ti / Al / Ti. The active layer thin film adopts one or more materials such as amorphous indium gallium zinc oxide material (a-IGZO), zinc oxynitride (ZnON), indium zinc tin oxide (IZTO), amorphous silicon (a-Si), polycrystalline silicon (p-Si), sexithiophene, polythiophene, etc., that is, the present disclosure is applicable to transistors manufactured based on oxide technology, silicon technology and organic technology.

[0216] There are a few points to note:

[0217] (1) The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures can refer to general designs.

[0218] (2) In the absence of conflict, features in the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0219] The foregoing description is merely an exemplary embodiment of the present disclosure and is not intended to limit the scope of protection of the present disclosure. The scope of protection of the present disclosure is determined by the appended claims.

Claims

1. A display substrate, comprising: A substrate substrate; A plurality of light-emitting elements located on the substrate substrate; And A pixel defining layer, Wherein each of the light-emitting elements includes a first electrode, a light-emitting functional layer, and a second electrode, and the plurality of light-emitting elements include a first light-emitting element, The pixel defining layer includes a first pixel opening and a first partition opening. The first pixel opening is located on a side of the first electrode of the first light-emitting element away from the substrate substrate and exposes at least a part of the first electrode. The first partition opening is located around the first pixel opening. The pixel defining layer includes a first pixel defining portion located between the first pixel opening and the first partition opening and a second pixel defining portion located on a side of the first partition opening away from the first pixel opening. The first pixel defining portion includes a connected first main portion and a first compensation portion. The first compensation portion is located on a side of the first main portion close to the first partition opening. The first compensation portion has a first convex profile that protrudes from the top of the first main portion in a direction away from the substrate substrate, so that the maximum height of the first compensation portion is greater than the maximum height of the first main portion.

2. The display substrate according to claim 1, wherein, One end of the first convex profile is located at the top of the first main portion, and the other end of the first convex profile is located at the edge of the first partition opening.

3. The display substrate according to claim 1, wherein, The first convex profile intersects with the upper surface of the first main portion away from the substrate substrate at an inflection point. The included angle between a tangent line passing through the inflection point and tangent to the first convex profile and a tangent line passing through the inflection point and tangent to the upper surface is less than 180 degrees.

4. The display substrate according to any one of claims 1 to 3, wherein, The edge profile of the first pixel defining portion close to the first partition opening has a first slope angle, and the edge profile of the second pixel defining portion close to the first partition opening has a second slope angle. The value range of the difference between the first slope angle and the second slope angle is 0 to 40 degrees.

5. The display substrate according to claim 4, wherein, The first slope angle is greater than the second slope angle, and the value range of the difference between the first slope angle and the second slope angle is 20 to 40 degrees.

6. The display substrate according to claim 5, wherein, The edge profile of the first pixel defining portion close to the first pixel opening has a third slope angle. The value range of the difference between the third slope angle and the first slope angle is 20 to 40 degrees.

7. The display substrate according to any one of claims 1-6, wherein The difference between the third slope angle and the second slope angle is less than 5 degrees.

8. The display substrate according to any one of claims 1-7, wherein The maximum height of the first main portion is the same as the maximum height of the second pixel defining portion, and the maximum height of the first compensation portion is greater than the maximum height of the first main portion.

9. The display substrate according to any one of claims 1-7, wherein, The side of the first convex profile close to the first main portion has a fourth slope angle, and the value range of the fourth slope angle is 0 to 20 degrees.

10. The display substrate according to any one of claims 1-7, wherein, The direction from the first pixel opening to the first partition opening is the first direction. The ratio range of the width of the first compensation portion in the first direction to the width of the first main portion in the first direction is 0 to 0.

3.

11. The display substrate according to any one of claims 1-10, further comprising: A partition functional layer, located between the substrate and the plurality of light-emitting elements in a direction perpendicular to the substrate. Wherein, the partition functional layer includes a first partition groove, and a positive projection of the first partition opening on the substrate covers an edge of the first partition groove close to the first pixel opening.

12. The display substrate according to claim 11, wherein, The light-emitting functional layer includes a charge generation layer, and the charge generation layer is disconnected at an edge of the first partition groove close to the first pixel opening.

13. The display substrate according to claim 12, wherein, The light-emitting functional layer further includes a first light-emitting layer and a second light-emitting layer located on two sides of the charge generation layer in a direction perpendicular to the substrate.

14. The display substrate according to any one of claims 1-13, wherein The plurality of light-emitting elements includes a second light-emitting element, and the pixel defining layer further includes a second pixel opening, located on a side of the first electrode of the second light-emitting element away from the substrate and exposing at least a part of the first electrode. The second pixel opening is located on a side of the first partition opening away from the first pixel opening. The second pixel defining portion is located between the first partition opening and the second pixel opening.

15. The display substrate according to claim 14, wherein, A dimension of the second pixel defining portion in the first direction is greater than a dimension of the first pixel defining portion in the first direction.

16. The display substrate according to claim 14, wherein, The second pixel defining portion includes a connected second main body portion and a second compensation portion, and the second compensation portion is located on a side of the second main body portion close to the first partition opening. The second compensation portion has a second convex profile protruding from a top of the second main body portion in a direction away from the substrate, so that a maximum height of the second compensation portion is greater than a maximum height of the second main body portion.

17. The display substrate according to claim 16, wherein, The first compensation portion and the second compensation portion are connected at two opposite edges of the first partition opening in a second direction to surround the first partition opening, and the second direction is perpendicular to a direction from the first pixel opening to the first partition opening.

18. The display substrate according to claim 16, wherein, A dimension of the second pixel defining portion in the first direction is equal to a dimension of the first pixel defining portion in the first direction.

19. The display substrate according to any one of claims 14-18, wherein, The plurality of light-emitting elements includes a third light-emitting element, and the pixel defining layer further includes a third pixel opening and a second partition opening. The third pixel opening is located on a side of the first electrode of the third light-emitting element away from the substrate and exposes at least a part of the first electrode, and the second partition opening is located between the first pixel opening and the third pixel opening. The pixel defining layer includes a third pixel defining portion located between the first pixel opening and the second partition opening and a fourth pixel defining portion located between the second partition opening and the third pixel opening. The third pixel defining portion includes a connected third main body portion and a third compensation portion, the third compensation portion is located on a side of the third main body portion close to the second partition opening, and the third compensation portion has a third convex profile protruding from a top of the third main body portion in a direction away from the substrate, so that a maximum height of the third compensation portion is greater than a maximum height of the third main body portion.

20. The display substrate according to claim 19, further comprising: A partition functional layer, located between the substrate and the plurality of light-emitting elements in a direction perpendicular to the substrate. Wherein, the partition functional layer includes a second partition groove, and a positive projection of the second partition opening on the substrate covers an edge of the second partition groove close to the first pixel opening.

21. The display substrate according to any one of claims 1-20, wherein, A shape of a positive projection of the first partition opening on the substrate includes at least one of a strip shape and an L shape.

22. The display substrate according to any one of claims 1-20, wherein, The first compensation portion is multiplexed as a spacer.

23. The display substrate according to claim 22, wherein, A value range of a maximum height of the spacer in a direction perpendicular to the substrate is 0.9 - 1.3 micrometers.

24. The display substrate according to claim 22, wherein, A value range of a difference between the maximum height of the spacer and the maximum height of the first main portion is 0.1 - 0.5 micrometers.

25. A display substrate, comprising: A substrate; A plurality of light-emitting elements, located on the substrate; And A pixel defining layer, Wherein, each of the light-emitting elements includes a first electrode, a light-emitting functional layer, and a second electrode, and the plurality of light-emitting elements includes a first light-emitting element. The pixel defining layer includes a first pixel opening and a first partition opening. The first pixel opening is located on a side of the first electrode of the first light-emitting element away from the substrate and exposes at least a part of the first electrode. The first partition opening is located around the first pixel opening. The pixel defining layer includes a first pixel defining portion located between the first pixel opening and the first partition opening and a second pixel defining portion located on a side of the first partition opening away from the first pixel opening. An edge profile of the first pixel defining portion close to the first partition opening has a first slope angle, and an edge profile of the second pixel defining portion close to the first partition opening has a second slope angle, and the first slope angle and the second slope angle are different.

26. The display substrate according to claim 25, wherein, The first slope angle is greater than the second slope angle.

27. A display device, comprising the display substrate according to any one of claims 1 - 26.

28. A method for manufacturing a display substrate, comprising: Forming a first electrode on a substrate; Forming a pixel defining layer on a side of the first electrode away from the substrate; Forming a light-emitting functional layer on a side of the pixel defining layer away from the first electrode; And Forming a second electrode on a side of the light-emitting functional layer away from the substrate, Wherein, the display substrate includes a plurality of light-emitting elements, each of the light-emitting elements includes the first electrode, the light-emitting functional layer, and the second electrode, and the plurality of light-emitting elements includes a first light-emitting element. The pixel defining layer includes a first pixel opening and a first partition opening. The first pixel opening is located on a side of the first electrode of the first light-emitting element away from the substrate and exposes at least a part of the first electrode. The first partition opening is located around the first pixel opening. The pixel defining layer includes a first pixel defining portion located between the first pixel opening and the first partition opening and a second pixel defining portion located on a side of the first partition opening away from the first pixel opening. The first pixel defining portion includes a connected first main portion and a first compensation portion. The first compensation portion is located on a side of the first main portion close to the first partition opening. The first compensation portion has a first convex profile protruding from the top of the first main portion in a direction away from the substrate, so that the maximum height of the first compensation portion is greater than the maximum height of the first main portion.

29. The manufacturing method of the display substrate according to claim 28, wherein, Forming a pixel defining layer on a side of the first electrode away from the substrate includes: Forming a pixel defining material layer on a side of the first electrode away from the substrate; and Patterning the pixel defining material layer by using a halftone mask to form the first pixel opening, the first partition opening, the first pixel defining portion, and the second pixel defining portion, wherein the first main portion of the first pixel defining portion corresponds to a partially transmissive portion of the halftone mask, and the first compensation portion corresponds to a completely blocking portion of the halftone mask.

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