Display substrate, display device and mask plate

Abstract

The utility model discloses a display substrate, a display device and a mask plate. The display substrate comprises a substrate and a plurality of pixel groups, each pixel group comprises a first color sub-pixel, two second color sub-pixels and a third color sub-pixel, the first color sub-pixel and the third color sub-pixel are arranged along a first direction, the two second color sub-pixels are arranged along a second direction intersected with the first direction, and the first color sub-pixel and the second color sub-pixel are arranged along a second direction intersected with the second direction. A first center connecting line of the first color sub-pixel and the third color sub-pixel intersects with a second center connecting line of the two second color sub-pixels; at least one of the first color light-emitting layer of the first color sub-pixel, the second color light-emitting layer of the second color sub-pixel and the third color light-emitting layer of the third color sub-pixel comprises a main body part and a protruding part connected with the main body part, and the protruding part protrudes in the direction away from the center of the main body part. The protruding part at least partially exceeds the extension line of the straight edge, close to the protruding part, of the body part. Therefore, the display substrate can reduce the probability of poor dark fringes.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a display substrate, a display device, and a mask plate used to form the display substrate. Background Art

[0002] Active matrix organic light emitting diode display devices (AMOLED) have become the research hotspot and technology development direction of major manufacturers due to their advantages such as wide color gamut, high contrast, thin and light design, self-luminescence, bright colors, low power consumption and wide viewing angle. At present, active matrix organic light emitting diode display devices have been widely used in various electronic products, ranging from small electronic products such as smart bracelets, smart watches, smart phones, tablet computers, etc. to large electronic products such as laptops, desktop computers, and televisions. Therefore, the market demand for active matrix organic light emitting diode display devices is also growing.

[0003] The light-emitting principle of the active matrix organic light-emitting diode display device is as follows: the display substrate of the active matrix organic light-emitting diode display device is formed with an anode, a cathode and an organic light-emitting layer; when light-emitting display is performed, electrons and holes are injected from the cathode and the anode into the electron transport layer and the hole transport layer respectively, and then the electrons and holes migrate from the electron transport layer and the hole transport layer to the organic light-emitting layer respectively, and meet in the organic light-emitting layer to form excitons and emit visible light. Utility Model Content

[0004] The embodiments of the present disclosure provide a display substrate, a display device and a mask plate. The display substrate can increase the distance between the edge of the corresponding light-emitting layer and the edge of the corresponding pixel opening by making at least one of the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer include a main body and a protrusion connected to the main body, thereby increasing the dark stripe margin and reducing the probability of dark stripe defects or horizontal stripe mura.

[0005] At least one embodiment of the present disclosure provides a display substrate, which includes: a base substrate; and a plurality of pixel groups located on the base substrate, each of the pixel groups including: a first color sub-pixel, two second color sub-pixels and a third color sub-pixel, the first color sub-pixel and the third color sub-pixel are arranged along a first direction, the two second color sub-pixels are arranged along a second direction intersecting the first direction, a first center line connecting the first color sub-pixel and the third color sub-pixel and a second center line connecting the two second color sub-pixels intersect, the first color sub-pixel includes a first color light-emitting layer, the second color sub-pixel includes a second color light-emitting layer, and the third color sub-pixel includes a third color light-emitting layer, at least one of the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer includes a main body and a protruding portion connected to the main body, the protruding portion protrudes in a direction away from the center of the main body, and the protruding portion at least partially extends beyond an extension line of a straight side of the main body close to the protruding portion.

[0006] For example, in a display substrate provided in an embodiment of the present disclosure, the shape of the orthographic projection of the main body portion on the base substrate is a rounded rectangle, the orthographic projection of the protruding portion on the base substrate is located at a rounded corner of the rounded rectangle, and protrudes in a direction away from the center of the rounded rectangle.

[0007] For example, in a display substrate provided in an embodiment of the present disclosure, a distance between an outer edge of the protrusion away from the main body and an edge of the main body is greater than 2 micrometers.

[0008] For example, in a display substrate provided in one embodiment of the present disclosure, the protrusion is away from the outer edge of the main body and contacts or overlaps with an adjacent light-emitting layer, and the adjacent light-emitting layer is the first color light-emitting layer, the second color light-emitting layer or the third color light-emitting layer adjacent to the protrusion.

[0009] For example, in a display substrate provided in one embodiment of the present disclosure, the first color light-emitting layer includes a first main body and a first protruding portion connected to the first main body, the first protruding portion protrudes in a direction away from the center of the first main body, and the first protruding portion at least partially exceeds an extension line of a straight side of the first main body close to the first protruding portion.

[0010] For example, in a display substrate provided by an embodiment of the present disclosure, in the same pixel group, the first protrusion protrudes toward the third color light-emitting layer.

[0011] For example, in the display substrate provided in an embodiment of the present disclosure, in the same pixel group, the first protrusion is away from the outer edge of the first main body and contacts or overlaps with the third color light-emitting layer.

[0012] For example, in a display substrate provided in an embodiment of the present disclosure, the orthographic projection of the first main body portion on the base substrate is a first rounded rectangle, and the first protruding portion is located at a rounded corner of the first rounded rectangle.

[0013] For example, in a display substrate provided in an embodiment of the present disclosure, only the first color light-emitting layer among the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer includes the protrusion.

[0014] For example, in a display substrate provided in an embodiment of the present disclosure, the orthographic projection of the second color light-emitting layer on the base substrate is a second rounded rectangle, and the orthographic projection of the third color light-emitting layer on the base substrate is a third rounded rectangle.

[0015] For example, in a display substrate provided in an embodiment of the present disclosure, the first color light-emitting layer includes a first uniform thickness portion, a first inner thickness thinning portion and a first outer thickness thinning portion, and the orthographic projection of the first protruding portion on the base substrate overlaps with the orthographic projection of the first outer thickness thinning portion on the base substrate.

[0016] For example, in a display substrate provided in one embodiment of the present disclosure, the second color light-emitting layer includes a second main body portion and a second protruding portion connected to the second main body portion, the second protruding portion protrudes in a direction away from the center of the second main body portion, and the second protruding portion at least partially exceeds the extension line of the straight side of the second main body portion close to the second protruding portion.

[0017] For example, in a display substrate provided by an embodiment of the present disclosure, in the same pixel group, two second protrusions of two second color sub-pixels are arranged opposite to each other and protrude toward each other.

[0018] For example, in a display substrate provided in an embodiment of the present disclosure, the orthographic projection of the second main body portion on the base substrate is a second rounded rectangle, and the second protruding portion is located at a rounded corner of the second rounded rectangle.

[0019] For example, in a display substrate provided in an embodiment of the present disclosure, the second protrusions are respectively provided at the four rounded corners of the second rounded rectangle, and at least two of the four second protrusions at the four rounded corners of the second rounded rectangle have different sizes.

[0020] For example, in a display substrate provided in an embodiment of the present disclosure, among the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer, only the second color light-emitting layer includes the protrusion.

[0021] For example, in a display substrate provided in an embodiment of the present disclosure, the orthographic projection of the first color light-emitting layer on the base substrate is a first rounded rectangle, and the orthographic projection of the third color light-emitting layer on the base substrate is a third rounded rectangle.

[0022] For example, in a display substrate provided in an embodiment of the present disclosure, the second color light-emitting layer includes a second uniform thickness portion, a second inner thickness thinning portion and a second outer thickness thinning portion, and the orthographic projection of the second protruding portion on the base substrate overlaps with the orthographic projection of the second outer thickness thinning portion on the base substrate.

[0023] For example, in a display substrate provided in one embodiment of the present disclosure, the third color light-emitting layer includes a third main body portion and a third protruding portion connected to the third main body portion, the third protruding portion protrudes in a direction away from the center of the third main body portion, and the third protruding portion at least partially exceeds an extension line of a straight side of the third main body portion close to the third protruding portion.

[0024] For example, in a display substrate provided in an embodiment of the present disclosure, the first color light-emitting layer is formed by evaporation using a first metal mask plate, the second color light-emitting layer is formed by evaporation using a second metal mask plate, and the third color light-emitting layer is formed by evaporation using a third metal mask plate.

[0025] For example, in a display substrate provided in an embodiment of the present disclosure, the first color sub-pixel also includes a first color pixel electrode, which is configured to drive the first color light-emitting layer to emit light, the second color sub-pixel also includes a second color pixel electrode, which is configured to drive the second color light-emitting layer to emit light, and the third color sub-pixel also includes a third color pixel electrode, which is configured to drive the third color light-emitting layer to emit light.

[0026] For example, a display substrate provided by an embodiment of the present disclosure also includes: a pixel defining layer, located on the base substrate, the pixel defining layer including a first pixel opening, a second pixel opening and a third pixel opening, the first pixel opening being configured to expose a portion of the first color pixel electrode layer, the first color light-emitting layer being in contact with the first color pixel electrode through the first pixel opening, the second pixel opening being configured to expose a portion of the second color pixel electrode layer, the second color light-emitting layer being in contact with the second color pixel electrode through the second pixel opening, the third pixel opening being configured to expose a portion of the third color pixel electrode layer, the third color light-emitting layer being in contact with the third color pixel electrode through the third pixel opening.

[0027] For example, in a display substrate provided in an embodiment of the present disclosure, the first color light-emitting layer includes a first uniform thickness portion, a first inner thinned thickness portion, and a first outer thinned thickness portion; the second color light-emitting layer includes a second uniform thickness portion, a second inner thinned thickness portion, and a second outer thinned thickness portion; the third color light-emitting layer includes a third uniform thickness portion, a third inner thinned thickness portion, and a third outer thinned thickness portion; the orthographic projection of the first pixel opening on the substrate falls within the range of the orthographic projection of the first uniform thickness portion on the substrate; the orthographic projection of the second pixel opening on the substrate falls within the range of the orthographic projection of the second uniform thickness portion on the substrate; and the orthographic projection of the third pixel opening on the substrate falls within the range of the orthographic projection of the third uniform thickness portion on the substrate

[0028] For example, in a display substrate provided in an embodiment of the present disclosure, the third pixel opening includes a first corner and a second corner that are oppositely arranged, and the curvature of the outer edge of the first corner is smaller than the curvature of the outer edge of the second corner.

[0029] For example, in a display substrate provided in an embodiment of the present disclosure, the ratio of the radius of curvature of the outer edge of the first corner to the radius of curvature of the outer edge of the third color light-emitting layer adjacent to the first corner away from the first corner is in the range of 0.9-1.1.

[0030] For example, in the display substrate provided in an embodiment of the present disclosure, the ratio of the radius of curvature of the outer edge of the second corner to the radius of curvature of the outer edge of the third color light-emitting layer adjacent to the second corner away from the second corner is in the range of 0.25-0.40.

[0031] For example, in a display substrate provided in an embodiment of the present disclosure, the third color light-emitting layer includes a third main body portion and a third protruding portion connected to the third main body portion, the third protruding portion protrudes in a direction away from the center of the third main body portion, the third protruding portion at least partially extends beyond an extension line of a straight side of the third main body portion close to the third protruding portion, and a first distance between an outer edge of the first corner portion and an outer edge of the third protruding portion adjacent to the first corner portion away from the third main body portion is greater than a second distance between an outer edge of the second corner portion and an outer edge of the third protruding portion adjacent to the second corner portion away from the third main body portion.

[0032] For example, in a display substrate provided in an embodiment of the present disclosure, a difference between the first distance and the second distance is greater than 1 micrometer.

[0033] For example, in a display substrate provided in an embodiment of the present disclosure, the ratio of the curvature radius of the outer edge of the first corner portion to the curvature radius of the outer edge of the third protrusion adjacent to the first corner portion away from the first corner portion is in the range of 0.85-1.05.

[0034] For example, in a display substrate provided in an embodiment of the present disclosure, the ratio of the radius of curvature of the outer edge of the second corner to the radius of curvature of the outer edge of the third color light-emitting layer adjacent to the second corner away from the second corner is in the range of 0.35-0.45.

[0035] For example, in the display substrate provided in one embodiment of the present disclosure, the third color light-emitting layer adjacent to the first corner is retracted away from the outer edge of the first corner, so that the difference between the third distance between the outer edge of the first corner and the outer edge of the third color light-emitting layer adjacent to the first corner away from the first corner and the fourth distance between the outer edge of the second corner and the outer edge of the third color light-emitting layer adjacent to the second corner away from the second corner is less than 0.5 microns.

[0036] For example, in a display substrate provided in one embodiment of the present disclosure, a third distance between an outer edge of the first corner and an outer edge of the third color light-emitting layer adjacent to the first corner away from the first corner is equal to a fourth distance between an outer edge of the second corner and an outer edge of the third color light-emitting layer adjacent to the second corner away from the second corner.

[0037] For example, in a display substrate provided in an embodiment of the present disclosure, the first color light-emitting layer is configured to emit red light, the second color light-emitting layer is configured to emit green light, and the third color light-emitting layer is configured to emit blue light.

[0038] At least one embodiment of the present disclosure further provides a display device, which includes any of the display substrates described above.

[0039] At least one embodiment of the present disclosure further provides a mask plate for forming any of the above-mentioned display substrates, the mask plate comprising: a mask opening configured to form the first color light-emitting layer, the second color light-emitting layer or the third color light-emitting layer, the mask opening comprising an opening main body portion and an opening protrusion portion located on the opening main body portion and protruding in a direction away from the center of the opening main body portion, the opening protrusion portion at least partially extending beyond an extension line of a straight side of the opening main body portion close to the opening protrusion portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 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, but are not intended to limit the present disclosure.

[0041] Figure 1 is a schematic diagram of a display substrate;

[0042] Figure 2 A display substrate Figure 1 Schematic diagram of the cross section along the AA' direction;

[0043] Figure 3 A schematic plan view of a display substrate provided in one embodiment of the present disclosure;

[0044] Figure 4 A display substrate provided by an embodiment of the present disclosure Figure 3 Schematic diagram of the cross section along line BB';

[0045] Figure 5 A schematic plan view of another display substrate provided in one embodiment of the present disclosure;

[0046] Figure 6 A display substrate provided by an embodiment of the present disclosure Figure 5 Schematic diagram of the cross section along the CC' line;

[0047] Figure 7 A schematic plan view of another display substrate provided in one embodiment of the present disclosure;

[0048] Figure 8 A display substrate provided by an embodiment of the present disclosure Figure 7 Schematic diagram of the cross section along line DD';

[0049] Fig. 9 A schematic plan view of another display substrate provided in one embodiment of the present disclosure;

[0050] Fig.10 A schematic plan view of another display substrate provided in one embodiment of the present disclosure;

[0051] Fig.11 A schematic plan view of another display substrate provided in one embodiment of the present disclosure;

[0052] Fig.12 A schematic plan view of another display substrate provided in one embodiment of the present disclosure;

[0053] Fig.13 A schematic diagram of a display device provided in accordance with an embodiment of the present disclosure; and

[0054] Fig.14A schematic plan view of a mask plate provided in accordance with an embodiment of the present disclosure. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than 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.

[0056] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. The words "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0057] 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 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 in the following of 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" refers to one or more, and "multiple" refers to 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.

[0058] As the resolution of smartphones and tablets increases, the size of sub-pixels decreases, and the area of ​​the effective light-emitting region of sub-pixels also decreases. For active matrix organic light-emitting diode displays (AMOLEDs), as the size of sub-pixels decreases, the distance between the pixel openings of sub-pixels of different colors (PDL Gap) also decreases. Therefore, the corners of red sub-pixels are increasingly affected by the internal shadow of evaporation, which easily leads to dark stripes or horizontal mura. It should be noted that the above-mentioned internal shadow of evaporation refers to the phenomenon that the thickness of the organic film layer formed in a part of the inner area of ​​the edge of the mask opening during the evaporation process is uneven.

[0059] Figure 1 Schematic diagram of a display substrate. Figure 1 As shown, the display substrate 10 includes a red sub-pixel 21, a green sub-pixel 22 and a blue sub-pixel 23; the red sub-pixel 21 includes a red anode 21A, a red pixel opening 21B and a red light-emitting layer 21C, the red pixel opening 21B is configured to expose a portion of the red anode 21A, and the red light-emitting layer 21C is arranged in contact with the red anode 21A through the red pixel opening 21B; the green sub-pixel 22 includes a green anode 22A, a green pixel opening 22B and a green light-emitting layer 22C, the green pixel opening 22B is configured to expose a portion of the green anode 22A, and the green light-emitting layer 22C is arranged in contact with the green anode 22A through the green pixel opening 22B; the blue sub-pixel 23 includes a blue anode 23A, a blue pixel opening 23B and a blue light-emitting layer 23C, the blue pixel opening 23B is configured to expose a portion of the blue anode 23A, and the blue light-emitting layer 23C is arranged in contact with the blue anode 23A through the blue pixel opening 23B.

[0060] like Figure 1 As shown, the interval between two different pixel openings is called a pixel opening interval (PDL Gap). The pixel opening interval between the red pixel opening 21B and the green pixel opening 22B is the interval between two straight edges, and the pixel opening interval between the blue pixel opening 23B and the green pixel opening 22B is also the interval between two straight edges. The sizes of the above two intervals are both a; while the pixel opening interval between the red pixel opening 21B and the blue pixel opening 23B is the interval between two corners, and its size is b, which is larger than a. On the other hand, as Figure 1 As shown, c represents the distance between the red light emitting layer 21C and the blue light emitting layer 23C, d represents the distance from the pixel opening to the edge of the corresponding light emitting layer (or the edge of the mask opening), and e represents the width of the red light emitting layer 21C.

[0061] Figure 2 A display substrate Figure 1Schematic diagram of the cross section along the AA' direction. Figure 2 As shown, a pixel defining layer 40 is provided between the red pixel opening 21B and the blue pixel opening 23B, and the red pixel opening 21B and the blue pixel opening 23B can also be regarded as two openings in the pixel defining layer 40; the red light-emitting layer 21C and the blue light-emitting layer 23C respectively include a thickness uniform portion, an inner shadow portion and an outer shadow portion which are arranged in sequence, and the thickness of the inner shadow portion and the outer shadow portion are both uneven (usually small), and dark stripes or horizontal mura will appear if the light-emitting display is performed. The inner shadow portion refers to the uneven thickness portion formed by a part of the area inside the edge of the mask opening during the evaporation process, and the outer shadow portion refers to the uneven thickness portion formed by a part of the area outside the edge of the mask opening during the evaporation process.

[0062] like Figure 2 As shown, if the outer shadow portion of the red light emitting layer 21C overlaps with the blue pixel opening 23B in the adjacent blue sub-pixel 23, or the outer shadow portion of the blue light emitting layer 23C overlaps with the red pixel opening 21B in the adjacent red sub-pixel 21, color mixing failure will occur. On the other hand, if the inner shadow portion of the red light emitting layer 21C overlaps with the red pixel opening 21B, or the inner shadow portion of the blue light emitting layer 23C overlaps with the blue pixel opening 23B, dark streak failure or horizontal mura will occur.

[0063] Due to errors such as alignment accuracy during the evaporation process, the mask plate 30 and the display substrate 10 may be misaligned to a certain extent. Therefore, the margin (Margin) of the above-mentioned color mixing defect is equal to b minus d, minus the width f of the outer shadow part, that is, the color mixing Margin = bdf; the margin (Margin) of the above-mentioned dark stripe defect is equal to d minus the width g of the inner shadow part, that is, the dark stripe Margin = dg. As shown above, since the width b of the pixel opening interval between the red pixel opening 21B and the blue pixel opening 23B is relatively large, which is greater than the width a of the pixel opening interval between the red pixel opening 21B and the green pixel opening 22B, the inventor of the present application has thought of reducing the above-mentioned color mixing Margin and increasing the above-mentioned dark stripe Margin to reduce the probability of dark stripe defects, thereby improving product quality and yield.

[0064] For example, in one product, the value of a is 19μm, the value of b is 23.9μm, the value of d is 8.6μm, the width of the shadow is 5μm, the width of the inner shadow is 3.2μm, and the width of the outer shadow is 1.8μm. According to the above formula, the color mixing margin at the corner of the red sub-pixel is 23.9μm-8.6μm-1.8μm=13.5μm, and the dark stripe margin at the corner of the red sub-pixel is 8.6μm-3.2μm=5.4μm. It can be seen that the color mixing margin at the corner of the red sub-pixel is larger, and the possibility of color mixing defects is lower, but the dark stripe margin is smaller, and the possibility of dark stripe defects is higher. In addition, since the rounded corners of the fine metal mask (FMM) of the red and blue light-emitting layers are limited by the manufacturing process of the fine metal mask and the influence of the magnetic force of the evaporator, the size of the inner shadow at this position is uneven. When the inner shadow becomes larger, dark stripes or horizontal mura are prone to occur. In order to improve this problem, space can be provided by reducing the color mixing margin to increase the dark stripe margin, thereby reducing the possibility of dark stripe defects. For example, the red light-emitting layer can be made to protrude toward the blue light-emitting layer, thereby increasing the above-mentioned d value. For example, d can be changed from the existing 8.6μm to 13.3μm, so that the color mixing margin at the corner of the red sub-pixel = 23.9μm-13.3μm-1.8μm = 8.8μm, and the dark stripe margin at the corner of the red sub-pixel = 13.3μm-3.2μm = 10.1μm. As a result, the dark stripe margin at the corner of the red sub-pixel increases from 5.4 μm to 10.1 μm, thereby reducing the probability of dark stripe defects or horizontal mura.

[0065] In this regard, an embodiment of the present disclosure provides a display substrate, which includes: a base substrate; and a plurality of pixel groups located on the base substrate, each pixel group includes: a first color sub-pixel, two second color sub-pixels and a third color sub-pixel, the first color sub-pixel and the third color sub-pixel are arranged along a first direction, the two second color sub-pixels are arranged along a second direction intersecting the first direction, a first center line connecting the first color sub-pixel and the third color sub-pixel and a second center line connecting the two second color sub-pixels intersect; the first color sub-pixel includes a first color light-emitting layer, the second color sub-pixel includes a second color light-emitting layer, and the third color sub-pixel includes a third color light-emitting layer, at least one of the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer includes a main body and a protruding portion connected to the main body, the protruding portion protrudes in a direction away from the center of the main body, and the protruding portion at least partially extends beyond an extension line of a straight side of the main body close to the protruding portion. Thus, the display substrate can increase the distance between the edge of the corresponding light-emitting layer and the edge of the corresponding pixel opening by making at least one of the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer include a main body and a protruding portion connected to the main body, thereby increasing the dark stripe margin and reducing the probability of dark stripe defects or horizontal mura.

[0066] The embodiment of the present disclosure also provides a display device, comprising the above-mentioned display substrate, so that the display device can have higher product quality and yield.

[0067] The disclosed embodiment also provides a mask plate for forming the above-mentioned display substrate; the mask plate includes: a mask opening configured to form the first color light-emitting layer, the second color light-emitting layer or the third color light-emitting layer; the mask opening includes an opening main body and an opening protrusion located in the opening main body and protruding in a direction away from the center of the opening main body, and the opening protrusion at least partially exceeds the extension line of the straight edge of the opening main body close to the opening protrusion. Thus, the light-emitting layer formed by using the mask plate has a protrusion, which can increase the distance between the edge of the corresponding light-emitting layer and the edge of the corresponding pixel opening, thereby increasing the dark stripe margin, thereby reducing the probability of dark stripe defects or horizontal mura.

[0068] The display substrate, the display device and the mask plate provided by the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0069] Figure 3 FIG. 1 is a schematic plan view of a display substrate provided by an embodiment of the present disclosure. Figure 3As shown, the display substrate 100 includes a base substrate 110 and a plurality of pixel groups 200 located on the base substrate 110; each pixel group 200 includes a first color sub-pixel 210, two second color sub-pixels 220 and a third color sub-pixel 230; in each pixel group 200, the first color sub-pixel 210 and the third color sub-pixel 230 are arranged along a first direction X, the two second color sub-pixels 220 are arranged along a second direction Y intersecting the first direction X, and the first center line of the first color sub-pixel 210 and the third color sub-pixel 230 and the second center line of the two second color sub-pixels 220 intersect. It should be noted that the above-mentioned pixel group is not a pixel, but may include two pixels, and display is performed by pixel borrowing.

[0070] For example, the first color sub-pixel 210 is configured to emit light of a first color, the second color sub-pixel 220 is configured to emit light of a second color, and the third color sub-pixel 230 is configured to emit light of a third color.

[0071] For example, the first color may be red, the second color may be green, and the third color may be blue. 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 interchangeable or other colors.

[0072] like Figure 3 As shown, the first color sub-pixel 210 includes a first color light-emitting layer 211, the second color sub-pixel 220 includes a second color light-emitting layer 221, and the third color sub-pixel 230 includes a third color light-emitting layer 231. At least one of the first color light-emitting layer 211, the second color light-emitting layer 221, and the third color light-emitting layer 231 includes a main body 280 and a protrusion 290 connected to the main body 280. The protrusion 290 protrudes in a direction away from the center of the main body 280, and the protrusion 290 at least partially exceeds the extension line of the straight side of the main body 280 close to the protrusion 290. In other words, the orthographic projection of the protrusion 290 on the base substrate 110 overlaps with the orthographic projection of the extension line of the straight side of the main body 280 close to the protrusion 290 on the base substrate 110. It should be noted that the corners of a conventional light-emitting layer are rounded, and must be located inside the extension lines of the two straight sides adjacent to the corners, that is, on the side where the extension lines of the two straight sides are close to the center of the light-emitting layer. The light-emitting layer provided in the embodiment of the present disclosure has a raised portion, and the raised portion at least partially extends beyond the extension line of the straight sides of the main body close to the raised portion.

[0073] In the display substrate provided by the embodiment of the present disclosure, since at least one of the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer includes a main body and a raised portion connected to the main body, and the raised portion protrudes in a direction away from the center of the main body and at least partially exceeds the extension line of the straight side of the main body close to the raised portion, the distance between the edge of the light-emitting layer provided with the raised portion and the edge of the corresponding pixel opening is increased, thereby increasing the dark stripe Margin, reducing the probability of dark stripe defects, and thus improving product quality and yield.

[0074] For example, the first direction X and the second direction Y may be perpendicular to each other. Of course, the embodiments of the present disclosure include but are not limited to this.

[0075] In some examples, the substrate may be a rigid substrate or a flexible substrate, which is not limited in the embodiments of the present disclosure.

[0076] In some examples, the material of the substrate may be made of one or more materials selected from the group consisting of glass, polyimide, polycarbonate, polyacrylate, polyetherimide, and polyethersulfone, and the present embodiment includes but is not limited to the above.

[0077] In some examples, the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer may be film layers that directly emit light, and may also include functional film layers for auxiliary light emission, such as: hole injection layer, hole transport layer, electron injection layer and electron transport layer.

[0078] In some examples, such as Figure 3 As shown, the orthographic projection of the main body 280 on the base substrate 110 is a rounded rectangle, and the orthographic projection of the protrusion 290 on the base substrate 110 is located at a rounded corner of the rounded rectangle and protrudes in a direction away from the center of the rounded rectangle.

[0079] In some examples, such as Figure 3 As shown, the distance between the outer edge of the protrusion 290 away from the main body 280 and the edge of the main body 280 is greater than 2 microns, which can effectively increase the dark stripe margin, thereby effectively reducing the probability of dark stripe defects, thereby improving product quality and yield. It should be noted that the edge of the main body can be a rounded edge tangent to the extension line of the two straight edges adjacent to the protrusion, and the distance between the rounded edge and the corresponding pixel opening is approximately equal to the distance between the straight edge of the main body and the straight edge of the corresponding pixel opening.

[0080] In some examples, such as Figure 3As shown, the difference between the distance between the outer edge of the protrusion 290 away from the main body 280 and the edge of the corresponding pixel opening and the distance between the straight edge of the main body 280 and the straight edge of the corresponding pixel opening is greater than 2 microns, thereby effectively increasing the dark stripe Margin, thereby effectively reducing the probability of dark stripe defects, thereby improving product quality and yield.

[0081] In some examples, such as Figure 3 As shown, the outer edge of the protrusion 290 away from the main body 280 contacts or overlaps with the adjacent light-emitting layer, and the adjacent light-emitting layer is the first color light-emitting layer 211, the second color light-emitting layer 221 or the third color light-emitting layer 231 adjacent to the protrusion 290. Therefore, the display substrate can make full use of the gap between the corners of the two adjacent light-emitting layers, thereby providing space by reducing the color mixing margin to increase the dark stripe margin, thereby reducing the possibility of the occurrence of dark stripe defects.

[0082] In some examples, such as Figure 3 As shown, the above-mentioned light-emitting layer with a protrusion may be a first color light-emitting layer 211. The first color light-emitting layer 211 includes a first main body 281 and a first protrusion 291 connected to the first main body 281. The first protrusion 291 protrudes in a direction away from the center of the first main body 281, and the first protrusion 291 at least partially exceeds the extension line of the straight side of the first main body 281 close to the first protrusion 291; that is, the orthographic projection of the first protrusion 291 on the base substrate 110 overlaps with the orthographic projection of the extension line of the straight side of the first main body 281 close to the first protrusion 291 on the base substrate 110. As a result, the distance between the edge of the first color light-emitting layer and the edge of the corresponding pixel opening is increased, thereby increasing the dark stripe Margin of the first color light-emitting layer, reducing the probability of dark stripe defects or horizontal stripe mura of the first color sub-pixel, thereby improving product quality and yield. It should be noted that in actual products, due to the size, layout and magnetic force of the first color sub-pixel, the first color sub-pixel is more prone to dark stripe defects and horizontal mura. Therefore, by making the first color light-emitting layer include the above-mentioned first main body and first protrusion, the display substrate can specifically increase the dark stripe margin of the first color light-emitting layer, reduce the occurrence probability of dark stripe defects or horizontal mura of the first color sub-pixel, thereby improving product quality and yield.

[0083] It should be noted that, in the above-mentioned example, the above-mentioned first main body portion is the above-mentioned main body portion, and the above-mentioned first protrusion portion is the above-mentioned protrusion portion.

[0084] In some examples, such as Figure 3As shown, in the same pixel group 200 , the first protrusion 291 protrudes toward the third color light emitting layer 231 , so that the first protrusion is provided by utilizing the gap between the first color light emitting layer 211 and the third color light emitting layer 231 .

[0085] In some examples, such as Figure 3 As shown, in the same pixel group 200, the first protrusion 291 is away from the outer edge of the first main body 281 and contacts or overlaps with the third color light-emitting layer 231, thereby making full use of the original gap between the first color light-emitting layer 211 and the third color light-emitting layer 231 to set the above-mentioned first protrusion.

[0086] In some examples, such as Figure 3 As shown, the orthographic projection of the first main body portion 281 on the base substrate 110 is a first rounded rectangle, and the first protruding portion 291 is located at a rounded corner of the first rounded rectangle.

[0087] In some examples, such as Figure 3 As shown, among the first color light-emitting layer 211, the second color light-emitting layer 221 and the third color light-emitting layer 231, only the first color light-emitting layer 211 includes the protrusion 290; that is, only the first color light-emitting layer 211 includes the first protrusion 291, and neither the second color light-emitting layer 221 nor the third color light-emitting layer 231 includes the protrusion. Thus, the display substrate can specifically use the space on the display substrate to increase the dark stripe Margin of the first color light-emitting layer, reduce the occurrence probability of dark stripe defects or horizontal stripe mura of the first color sub-pixel, and thus improve product quality and yield.

[0088] In some examples, such as Figure 3 As shown, the orthographic projection of the second color light emitting layer 221 on the base substrate 110 is a second rounded rectangle, and the orthographic projection of the third color light emitting layer 231 on the base substrate 110 is a third rounded rectangle.

[0089] For example, Figure 3 As shown, due to the influence of factors such as the luminous efficiency and life of the luminescent material, the area of ​​the third color luminescent layer 231 is larger than that of the first color luminescent layer 211 , and the area of ​​the first color luminescent layer 211 is larger than that of the second color luminescent layer 221 .

[0090] Figure 4 A display substrate provided by an embodiment of the present disclosure Figure 3 Schematic diagram of the cross section of line BB'. Figure 4As shown, the first color light emitting layer 211 includes a first uniform thickness portion 211A, a first inner reduced thickness portion 211B and a first outer reduced thickness portion 211C, and the orthographic projection of the first protruding portion 291 on the base substrate 110 overlaps with the orthographic projection of the first outer reduced thickness portion 211C on the base substrate 110. Therefore, the display substrate can use the newly added first protruding portion to arrange the above-mentioned first outer reduced thickness portion, thereby ensuring that the pixel opening corresponding to the first color light emitting layer is located within the range of the first uniform thickness portion, thereby improving the display quality and avoiding various defects.

[0091] In some examples, the orthographic projection of the first raised portion on the base substrate may also overlap with the orthographic projection of the first inner thickness reduction portion on the base substrate, thereby further ensuring that the pixel opening corresponding to the first color light-emitting layer is within the range of the first uniform thickness portion, thereby improving display quality and avoiding various defects.

[0092] In some examples, such as Figure 3 and Figure 4 As shown, the first color sub-pixel 210 further includes a first color pixel electrode 212, which is configured to drive the first color light-emitting layer 211 to emit light; the second color sub-pixel 220 further includes a second color pixel electrode 222, which is configured to drive the second color light-emitting layer 221 to emit light; the third color sub-pixel 230 further includes a third color pixel electrode 232, which is configured to drive the third color light-emitting layer 231 to emit light. It should be noted that the above-mentioned pixel electrodes can be anodes.

[0093] For example, the display substrate also includes a common cathode (not shown), and the first color pixel electrode 212 and the common cathode can inject holes and electrons into the first color light-emitting layer 211, so that the first color light-emitting layer 211 emits light; the second color pixel electrode 222 and the common cathode can inject holes and electrons into the second color light-emitting layer 221, so that the second color light-emitting layer 221 emits light; the third color pixel electrode 232 and the common cathode can inject holes and electrons into the third color light-emitting layer 231, so that the third color light-emitting layer 231 emits light.

[0094] In some examples, such as Figure 3 and Figure 4As shown, the display substrate 100 also includes a pixel defining layer 130 located on the base substrate 110; the pixel defining layer 130 includes a first pixel opening 131, a second pixel opening 132 and a third pixel opening 133, the first pixel opening 131 is configured to expose a portion of the first color pixel electrode layer 212, the first color light-emitting layer 211 is in contact with the first color pixel electrode 212 through the first pixel opening 131, the second pixel opening 132 is configured to expose a portion of the second color pixel electrode layer 222, the second color light-emitting layer 221 is in contact with the second color pixel electrode 222 through the second pixel opening 132, the third pixel opening 133 is configured to expose a portion of the third color pixel electrode layer 232, the third color light-emitting layer 231 is in contact with the third color pixel electrode 232 through the third pixel opening 133.

[0095] In some examples, such as Figure 3 and Figure 4 As shown, the first color light emitting layer 211 includes a first uniform thickness portion 211A, a first inner reduced thickness portion 211B and a first outer reduced thickness portion 211C, and the third color light emitting layer 231 includes a third uniform thickness portion 231A, a third inner reduced thickness portion 231B and a third outer reduced thickness portion 231C.

[0096] The orthographic projection of the first pixel opening 131 on the substrate 110 falls within the range of the orthographic projection of the first uniform thickness portion 211A on the substrate 110, ensuring that the first color light-emitting layer has a higher and more stable light-emitting quality, thereby improving the display quality and avoiding various defects. The orthographic projection of the third pixel opening 133 on the substrate 110 falls within the range of the orthographic projection of the third uniform thickness portion 231A on the substrate 110, ensuring that the second color light-emitting layer has a higher and more stable light-emitting quality, thereby improving the display quality and avoiding various defects.

[0097] In some examples, the material of the pixel defining layer may include an organic material, such as polyimide, acrylic, or polyethylene terephthalate.

[0098] In some examples, the pixel electrode of each sub-pixel may be formed by a patterning process. It should be noted that the patterning process may include a film forming process, an exposure process, a development process, and an etching process.

[0099] In some examples, the first color light-emitting layer 211 may be formed by evaporation using a first metal mask; the second color light-emitting layer 221 may be formed by evaporation using a second metal mask; and the third color light-emitting layer 231 may be formed by evaporation using a third metal mask.

[0100] In some examples, the common cathode may be formed of a material with high conductivity and low work function, for example, the common cathode may be made of a metal material. Each pixel electrode may be formed of a transparent conductive material with a high work function.

[0101] For example, the common cathode may 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 may be a single-layer structure, or a multi-layer composite structure, such as Ti / Al / Ti, or a stack structure formed by a metal and a transparent conductive material, such as reflective materials such as ITO / Ag / ITO, Mo / AlNd / ITO, etc.

[0102] For example, each of the above-mentioned pixel electrodes may be made of a transparent conductive material, such as indium tin oxide (ITO), or a multi-layer composite structure of metal and transparent conductive material.

[0103] Figure 5 FIG. 1 is a schematic plan view of another display substrate provided by an embodiment of the present disclosure. Figure 5 As shown, the display substrate 100 includes a base substrate 110 and a plurality of pixel groups 200 located on the base substrate 110; each pixel group 200 includes a first color sub-pixel 210, two second color sub-pixels 220 and a third color sub-pixel 230; in each pixel group 200, the first color sub-pixel 210 and the third color sub-pixel 230 are arranged along a first direction X, the two second color sub-pixels 220 are arranged along a second direction Y intersecting with the first direction X, and a first center line connecting the first color sub-pixel 210 and the third color sub-pixel 230 and a second center line connecting the two second color sub-pixels 220 intersect with each other.

[0104] For example, the first color sub-pixel 210 is configured to emit light of a first color, the second color sub-pixel 220 is configured to emit light of a second color, and the third color sub-pixel 230 is configured to emit light of a third color.

[0105] For example, the first color may be red, the second color may be green, and the third color may be blue. 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 interchangeable or other colors.

[0106] like Figure 5As shown, the first color sub-pixel 210 includes a first color light-emitting layer 211, the second color sub-pixel 220 includes a second color light-emitting layer 221, and the third color sub-pixel 230 includes a third color light-emitting layer 231; the second color light-emitting layer 221 includes a second main body 282 and a second protruding portion 292 connected to the second main body 282, the second protruding portion 292 protrudes in a direction away from the center of the second main body 282, and the second protruding portion 292 at least partially exceeds the extension line of the straight side of the second main body 282 close to the second protruding portion 292. In other words, the orthographic projection of the second protruding portion 292 on the base substrate 110 overlaps with the orthographic projection of the extension line of the straight side of the second main body 282 close to the second protruding portion 292 on the base substrate 110.

[0107] In the display substrate provided by the embodiment of the present disclosure, since the second color light-emitting layer includes a second main body portion and a second protruding portion connected to the second main body portion, the second protruding portion protrudes in a direction away from the center of the second main body portion, and the second protruding portion at least partially exceeds the extension line of the straight side of the second main body portion close to the second protruding portion, the distance between the edge of the second color light-emitting layer and the edge of the corresponding pixel opening is increased, thereby increasing the dark stripe Margin of the second color light-emitting layer, reducing the probability of occurrence of dark stripe defects in the second color light-emitting layer, thereby improving product quality and yield.

[0108] In some examples, such as Figure 5 As shown, the distance between the outer edge of the second protrusion 292 away from the second main body 282 and the edge of the second main body 282 is greater than 2 microns, which can effectively increase the dark stripe margin, thereby effectively reducing the probability of dark stripe defects in the second color light-emitting layer, thereby improving product quality and yield. It should be noted that the edge of the second main body can be a rounded edge tangent to the extension line of the two straight edges adjacent to the protrusion.

[0109] In some examples, such as Figure 5 As shown, the difference between the distance between the outer edge of the second protrusion 292 away from the second main body 282 and the edge of the corresponding pixel opening and the distance between the straight edge of the second main body 282 and the straight edge of the corresponding pixel opening is greater than 2 microns, thereby effectively increasing the dark stripe Margin, thereby effectively reducing the probability of occurrence of dark stripe defects in the third color light-emitting layer, thereby improving product quality and yield.

[0110] In some examples, such as Figure 5 As shown, in the same pixel group 200 , the two second protrusions 292 of the two second color sub-pixels 220 are disposed opposite to each other and protrude toward each other, so that the gap between the two second color sub-pixels 220 is used to form the second protrusion.

[0111] In some examples, such as Figure 5 As shown, the orthographic projection of the second main body portion 282 on the base substrate 110 is a second rounded rectangle, and the second protruding portion 292 is located at a rounded corner of the second rounded rectangle.

[0112] In some examples, such as Figure 5 As shown, the four rounded corners of the second rounded rectangle are respectively provided with second protrusions 292, and at least two of the four second protrusions 292 of the four rounded corners of the second rounded rectangle have different sizes. Since the four corners of the second color light-emitting layer 221 are located in different environments, the sizes of the four second protrusions 292 of the four corners of the second color light-emitting layer 221 can be set according to the space of the location, so at least two of the four second protrusions 292 of the four rounded corners of the second rounded rectangle have different sizes.

[0113] It should be noted that if Figure 5 As shown, the upper corner of the second color light-emitting layer 221 is located between the first color light-emitting layer 211 and the third color light-emitting layer 231 arranged along the first direction, the left corner of the second color light-emitting layer 221 is located between the first color light-emitting layer 211 and the third color light-emitting layer 231 arranged along the second direction, the lower corner of the second color light-emitting layer 221 is located between the third color light-emitting layer 231 and the first color light-emitting layer 211 arranged along the first direction, and the right corner of the second color light-emitting layer 221 is located between the third color light-emitting layer 231 and the first color light-emitting layer 211 arranged along the second direction. Therefore, the four corners of the second color light-emitting layer 221 are located in different environments.

[0114] In some examples, such as Figure 5 As shown, among the first color light-emitting layer 211, the second color light-emitting layer 221 and the third color light-emitting layer 231, only the second color light-emitting layer 221 includes a protrusion; that is, the second color light-emitting layer 221 includes a second protrusion 292, and the first color light-emitting layer 211 and the third color light-emitting layer 231 do not include a protrusion.

[0115] In some examples, such as Figure 5 As shown, the orthographic projection of the first color light emitting layer 211 on the base substrate 110 is a first rounded rectangle, and the orthographic projection of the third color light emitting layer 231 on the base substrate 110 is a third rounded rectangle.

[0116] Figure 6 A display substrate provided by an embodiment of the present disclosure Figure 5 Schematic diagram of the cross section of the CC' line. Figure 6As shown, the second color light emitting layer 221 includes a second uniform thickness portion 221A, a second inner reduced thickness portion 221B and a second outer reduced thickness portion 221C, and the orthographic projection of the second convex portion 292 on the base substrate 110 overlaps with the orthographic projection of the second outer reduced thickness portion 221C on the base substrate 110. Therefore, the display substrate can use the newly added second convex portion to arrange the above-mentioned second outer reduced thickness portion, thereby ensuring that the pixel opening corresponding to the second color light emitting layer is located within the range of the second uniform thickness portion, thereby improving the display quality and avoiding various defects.

[0117] In some examples, the orthographic projection of the second raised portion on the base substrate may also overlap with the orthographic projection of the second inner thickness reduction portion on the base substrate, thereby further ensuring that the pixel opening corresponding to the second color light-emitting layer is located within the range of the second uniform thickness portion, thereby improving display quality and avoiding various defects.

[0118] In some examples, such as Figure 5 and Figure 6 As shown, the first color sub-pixel 210 further includes a first color pixel electrode 212, which is configured to drive the first color light-emitting layer 211 to emit light; the second color sub-pixel 220 further includes a second color pixel electrode 222, which is configured to drive the second color light-emitting layer 221 to emit light; the third color sub-pixel 230 further includes a third color pixel electrode 232, which is configured to drive the third color light-emitting layer 231 to emit light. It should be noted that the above-mentioned pixel electrodes can be anodes.

[0119] For example, the display substrate also includes a common cathode (not shown), and the first color pixel electrode 212 and the common cathode can inject holes and electrons into the first color light-emitting layer 211, so that the first color light-emitting layer 211 emits light; the second color pixel electrode 222 and the common cathode can inject holes and electrons into the second color light-emitting layer 221, so that the second color light-emitting layer 221 emits light; the third color pixel electrode 232 and the common cathode can inject holes and electrons into the third color light-emitting layer 231, so that the third color light-emitting layer 231 emits light.

[0120] In some examples, such as Figure 5 and Figure 6As shown, the display substrate 100 also includes a pixel defining layer 130 located on the base substrate 110; the pixel defining layer 130 includes a first pixel opening 131, a second pixel opening 132 and a third pixel opening 133, the first pixel opening 131 is configured to expose a portion of the first color pixel electrode layer 212, the first color light-emitting layer 211 is in contact with the first color pixel electrode 212 through the first pixel opening 131, the second pixel opening 132 is configured to expose a portion of the second color pixel electrode layer 222, the second color light-emitting layer 221 is in contact with the second color pixel electrode 222 through the second pixel opening 132, the third pixel opening 133 is configured to expose a portion of the third color pixel electrode layer 232, the third color light-emitting layer 231 is in contact with the third color pixel electrode 232 through the third pixel opening 133.

[0121] In some examples, such as Figure 5 and Figure 6 As shown, the first color light-emitting layer 211 includes a first uniform thickness portion 211A, a first inner thinned thickness portion 211B and a first outer thinned thickness portion 211C, the second color light-emitting layer 221 includes a second uniform thickness portion 212A, a second inner thinned thickness portion 212B and a second outer thinned thickness portion 222C, and the third color light-emitting layer 231 includes a third uniform thickness portion 231A, a third inner thinned thickness portion 231B and a third outer thinned thickness portion 231C.

[0122] The orthographic projection of the first pixel opening 131 on the substrate 110 falls within the range of the orthographic projection of the first uniform thickness portion 211A on the substrate 110, ensuring that the first color light-emitting layer has a higher and more stable light-emitting quality, thereby improving the display quality and avoiding various defects. The orthographic projection of the second pixel opening 132 on the substrate 110 falls within the range of the orthographic projection of the second uniform thickness portion 221A on the substrate 110, ensuring that the second color light-emitting layer has a higher and more stable light-emitting quality, thereby improving the display quality and avoiding various defects. The orthographic projection of the third pixel opening 133 on the substrate 110 falls within the range of the orthographic projection of the third uniform thickness portion 231A on the substrate 110, ensuring that the second color light-emitting layer has a higher and more stable light-emitting quality, thereby improving the display quality and avoiding various defects.

[0123] In some examples, the first color light-emitting layer 211 may be formed by evaporation using a first metal mask; the second color light-emitting layer 221 may be formed by evaporation using a second metal mask; and the third color light-emitting layer 231 may be formed by evaporation using a third metal mask.

[0124] Figure 7 FIG. 1 is a schematic plan view of another display substrate provided by an embodiment of the present disclosure. Figure 7As shown, the display substrate 100 includes a base substrate 110 and a plurality of pixel groups 200 located on the base substrate 110; each pixel group 200 includes a first color sub-pixel 210, two second color sub-pixels 220 and a third color sub-pixel 230; in each pixel group 200, the first color sub-pixel 210 and the third color sub-pixel 230 are arranged along a first direction X, the two second color sub-pixels 220 are arranged along a second direction Y intersecting with the first direction X, and a first center line connecting the first color sub-pixel 210 and the third color sub-pixel 230 and a second center line connecting the two second color sub-pixels 220 intersect with each other.

[0125] For example, the first color sub-pixel 210 is configured to emit light of a first color, the second color sub-pixel 220 is configured to emit light of a second color, and the third color sub-pixel 230 is configured to emit light of a third color.

[0126] For example, the first color may be red, the second color may be green, and the third color may be blue. 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 interchangeable or other colors.

[0127] like Figure 7 As shown, the first color sub-pixel 210 includes a first color light-emitting layer 211, the second color sub-pixel 220 includes a second color light-emitting layer 221, and the third color sub-pixel 230 includes a third color light-emitting layer 231; the third color light-emitting layer 231 includes a third main body 283 and a third protruding portion 293 connected to the third main body 283, the third protruding portion 293 protrudes in a direction away from the center of the third main body 283, and the third protruding portion 293 at least partially exceeds the extension line of the straight side of the third main body 283 close to the third protruding portion 293. In other words, the orthographic projection of the third protruding portion 293 on the base substrate 110 overlaps with the orthographic projection of the extension line of the straight side of the third main body 283 close to the third protruding portion 293 on the base substrate 110.

[0128] In the display substrate provided by the embodiment of the present disclosure, since the third color light-emitting layer includes a third main body portion and a third protruding portion connected to the third main body portion, the third protruding portion protrudes in a direction away from the center of the third main body portion, and the third protruding portion at least partially exceeds the extension line of the straight side of the third main body portion close to the third protruding portion, the distance between the edge of the third color light-emitting layer and the edge of the corresponding pixel opening is increased, thereby increasing the dark stripe Margin of the third color light-emitting layer, reducing the probability of occurrence of dark stripe defects in the third color light-emitting layer, thereby improving product quality and yield.

[0129] For example, the first direction X and the second direction Y may be perpendicular to each other. Of course, the embodiments of the present disclosure include but are not limited to this.

[0130] In some examples, such as Figure 7 As shown, the distance between the outer edge of the third protrusion 293 away from the third main body 283 and the edge of the third main body 283 is greater than 2 microns, which can effectively increase the dark stripe Margin, thereby effectively reducing the probability of dark stripe defects in the third color light-emitting layer, thereby improving product quality and yield. It should be noted that the edge of the third main body can be a rounded edge tangent to the extension line of the two straight edges adjacent to the protrusion.

[0131] In some examples, such as Figure 7 As shown, the difference between the distance between the outer edge of the third protrusion 293 away from the third main body 283 and the edge of the corresponding pixel opening and the distance between the straight edge of the third main body 283 and the straight edge of the corresponding pixel opening is greater than 2 microns, thereby effectively increasing the dark stripe Margin, thereby effectively reducing the probability of occurrence of dark stripe defects in the third color light-emitting layer, thereby improving product quality and yield.

[0132] In some examples, such as Figure 7 As shown, the third protrusion 293 is away from the outer edge of the third main body 283 and contacts or overlaps with the adjacent first color light emitting layer 211. Therefore, the display substrate can make full use of the gap between the two corners of the adjacent first color light emitting layer 211 and the third color light emitting layer 231, thereby providing space by reducing the color mixing margin to increase the dark stripe margin, thereby reducing the possibility of dark stripe defects.

[0133] In some examples, such as Figure 7 As shown, in the same pixel group 200 , the third protrusion 293 protrudes toward the first color light emitting layer 211 , so that the third protrusion is provided by utilizing the gap between the first color light emitting layer 211 and the third color light emitting layer 231 .

[0134] In some examples, such as Figure 7 As shown, the orthographic projection of the third main body portion 283 on the base substrate 110 is a third rounded rectangle, and the third protruding portion 293 is located at a rounded corner of the third rounded rectangle.

[0135] In some examples, such as Figure 7As shown, among the first color light-emitting layer 211, the second color light-emitting layer 221 and the third color light-emitting layer 231, only the third color light-emitting layer 231 includes the protrusion 290; that is, only the third color light-emitting layer 231 includes the third protrusion 293, and neither the first color light-emitting layer 211 nor the second color light-emitting layer 221 includes the protrusion. Thus, the display substrate can specifically use the space on the display substrate to increase the dark stripe Margin of the third color light-emitting layer, reduce the occurrence probability of dark stripe defects or horizontal stripe mura of the third color sub-pixel, and thus improve product quality and yield.

[0136] In some examples, such as Figure 7 As shown, the orthographic projection of the second color light emitting layer 221 on the base substrate 110 is a second rounded rectangle, and the orthographic projection of the first color light emitting layer 211 on the base substrate 110 is a first rounded rectangle.

[0137] For example, Figure 7 As shown, due to the influence of factors such as the luminous efficiency and life of the luminescent material, the area of ​​the third color luminescent layer 231 is larger than that of the first color luminescent layer 211 , and the area of ​​the first color luminescent layer 211 is larger than that of the second color luminescent layer 221 .

[0138] Figure 8 A display substrate provided by an embodiment of the present disclosure Figure 7 Schematic diagram of the cross section of the DD' line. Figure 8 As shown, the third color light emitting layer 231 includes a third uniform thickness portion 231A, a third inner reduced thickness portion 231B and a third outer reduced thickness portion 231C, and the orthographic projection of the third convex portion 293 on the base substrate 110 overlaps with the orthographic projection of the third outer reduced thickness portion 231C on the base substrate 110. Therefore, the display substrate can use the newly added third convex portion to arrange the third outer reduced thickness portion, thereby ensuring that the pixel opening corresponding to the third color light emitting layer is located within the range of the third uniform thickness portion, thereby improving the display quality and avoiding various defects.

[0139] In some examples, the orthographic projection of the third raised portion on the base substrate may also overlap with the orthographic projection of the third inner thickness reduction portion on the base substrate, thereby further ensuring that the pixel opening corresponding to the first color light-emitting layer is within the range of the first uniform thickness portion, thereby improving display quality and avoiding various defects.

[0140] In some examples, such as Figure 7 and Figure 8As shown, the first color sub-pixel 210 further includes a first color pixel electrode 212, which is configured to drive the first color light-emitting layer 211 to emit light; the second color sub-pixel 220 further includes a second color pixel electrode 222, which is configured to drive the second color light-emitting layer 221 to emit light; the third color sub-pixel 230 further includes a third color pixel electrode 232, which is configured to drive the third color light-emitting layer 231 to emit light. It should be noted that the above-mentioned pixel electrodes can be anodes.

[0141] For example, the display substrate also includes a common cathode (not shown), and the first color pixel electrode 212 and the common cathode can inject holes and electrons into the first color light-emitting layer 211, so that the first color light-emitting layer 211 emits light; the second color pixel electrode 222 and the common cathode can inject holes and electrons into the second color light-emitting layer 221, so that the second color light-emitting layer 221 emits light; the third color pixel electrode 232 and the common cathode can inject holes and electrons into the third color light-emitting layer 231, so that the third color light-emitting layer 231 emits light.

[0142] In some examples, such as Figure 7 and Figure 8 As shown, the display substrate 100 also includes a pixel defining layer 130 located on the base substrate 110; the pixel defining layer 130 includes a first pixel opening 131, a second pixel opening 132 and a third pixel opening 133, the first pixel opening 131 is configured to expose a portion of the first color pixel electrode layer 212, the first color light-emitting layer 211 is in contact with the first color pixel electrode 212 through the first pixel opening 131, the second pixel opening 132 is configured to expose a portion of the second color pixel electrode layer 222, the second color light-emitting layer 221 is in contact with the second color pixel electrode 222 through the second pixel opening 132, the third pixel opening 133 is configured to expose a portion of the third color pixel electrode layer 232, the third color light-emitting layer 231 is in contact with the third color pixel electrode 232 through the third pixel opening 133.

[0143] In some examples, such as Figure 7 and Figure 8 As shown, the first color light-emitting layer 211 includes a first uniform thickness portion 211A, a first inner thinned thickness portion 211B and a first outer thinned thickness portion 211C, the second color light-emitting layer 221 includes a second uniform thickness portion 212A, a second inner thinned thickness portion 212B and a second outer thinned thickness portion 222C, and the third color light-emitting layer 231 includes a third uniform thickness portion 231A, a third inner thinned thickness portion 231B and a third outer thinned thickness portion 231C.

[0144] The orthographic projection of the first pixel opening 131 on the substrate 110 falls within the range of the orthographic projection of the first uniform thickness portion 211A on the substrate 110, ensuring that the first color light-emitting layer has a higher and more stable light-emitting quality, thereby improving the display quality and avoiding various defects. The orthographic projection of the second pixel opening 132 on the substrate 110 falls within the range of the orthographic projection of the second uniform thickness portion 221A on the substrate 110, ensuring that the second color light-emitting layer has a higher and more stable light-emitting quality, thereby improving the display quality and avoiding various defects. The orthographic projection of the third pixel opening 133 on the substrate 110 falls within the range of the orthographic projection of the third uniform thickness portion 231A on the substrate 110, ensuring that the second color light-emitting layer has a higher and more stable light-emitting quality, thereby improving the display quality and avoiding various defects.

[0145] In some examples, the first color light-emitting layer 211 may be formed by evaporation using a first metal mask; the second color light-emitting layer 221 may be formed by evaporation using a second metal mask; and the third color light-emitting layer 231 may be formed by evaporation using a third metal mask.

[0146] Fig. 9 A schematic plan view of another display substrate provided according to an embodiment of the present disclosure. Fig. 9 The display substrate shown is Figure 3 Similar to the display substrate shown in FIG. 1 , the first color light emitting layer 211 includes a protrusion 290 . Figure 3 The display substrate shown is different in that Fig. 9 The third pixel opening 133 in the display substrate 100 shown includes a first corner portion 133A and a second corner portion 133B that are arranged opposite to each other, and the curvature of the outer edge of the first corner portion 133A is smaller than the curvature of the outer edge of the second corner portion 133B. Thus, the display substrate can reduce or even avoid the occurrence of color separation by making the outer edge of the first corner portion of the third pixel opening more rounded. It should be noted that Fig. 9 The relevant definition of the first color light emitting layer in the display substrate shown can be found in Figure 3 The description will not be repeated here.

[0147] In some examples, the ratio of the radius of curvature of the outer edge of the first corner 133A to the radius of curvature of the outer edge of the third color light emitting layer 231 adjacent to the first corner 133A away from the first corner 133A is in the range of 0.9-1.1, for example, 0.95. Thus, the display substrate can make the radius of curvature of the outer edge of the first corner and the radius of curvature of the outer edge of the third color light emitting layer adjacent to the first corner away from the first corner close, thereby better avoiding the occurrence of color separation.

[0148] In some examples, the ratio of the radius of curvature of the outer edge of the second corner 133B to the radius of curvature of the outer edge of the third color light emitting layer 231 adjacent to the second corner 133B away from the second corner 133B is in the range of 0.25-0.4, for example, 0.34.

[0149] For example, the radius of curvature of the outer edge of the first corner 133A may be 9-11 microns, for example, 10 microns; the radius of curvature of the outer edge of the second corner 133B may be 3-4 microns, for example, 3.6 microns; the radius of curvature of the outer edge of the third color light-emitting layer 231 away from the first corner 133A and the second corner 133B may both be 12-15 microns, for example, 12.7 microns.

[0150] Fig.10 A schematic plan view of another display substrate provided according to an embodiment of the present disclosure. Fig.10 The display substrate shown is Figure 5 Similar to the display substrate shown in FIG. 1 , the second color light emitting layer 221 includes a protrusion 290 . Figure 5 The display substrate shown is different in that Fig.10 The third pixel opening 133 in the display substrate 100 shown includes a first corner portion 133A and a second corner portion 133B that are arranged opposite to each other, and the curvature of the outer edge of the first corner portion 133A is smaller than the curvature of the outer edge of the second corner portion 133B. Thus, the display substrate can reduce or even avoid the occurrence of color separation by making the outer edge of the first corner portion of the third pixel opening more rounded. It should be noted that Fig.10 The relevant definition of the second color light emitting layer in the display substrate shown can be found in Figure 5 The description will not be repeated here.

[0151] Fig.11 A schematic plan view of another display substrate provided according to an embodiment of the present disclosure. Fig.11 The display substrate shown is Figure 7 Similar to the display substrate shown in FIG. 1 , the third color light emitting layer 231 also includes a protrusion 290 . Figure 7 The display substrate shown is different in that Fig.11 The third pixel opening 133 in the display substrate 100 shown includes a first corner portion 133A and a second corner portion 133B that are arranged opposite to each other, and the curvature of the outer edge of the first corner portion 133A is smaller than the curvature of the outer edge of the second corner portion 133B. Thus, the display substrate can reduce or even avoid the occurrence of color separation by making the outer edge of the first corner portion of the third pixel opening more rounded. It should be noted that Fig.11 The relevant definition of the third color light emitting layer in the display substrate shown can be found in Figure 7 The description will not be repeated here.

[0152] In some examples, such as Fig.11 As shown, the third color light emitting layer 231 includes a third main body portion 283 and a third protruding portion 293 connected to the third main body portion 283, the third protruding portion 293 protrudes in a direction away from the center of the third main body portion 283, and the third protruding portion 293 at least partially exceeds the extension line of the straight side of the third main body portion 283 close to the third protruding portion 293. In other words, the orthographic projection of the third protruding portion 293 on the base substrate 110 overlaps with the orthographic projection of the extension line of the straight side of the third main body portion 283 close to the third protruding portion 293 on the base substrate 110.

[0153] In the display substrate provided by the embodiment of the present disclosure, since the third color light-emitting layer includes a third main body portion and a third protruding portion connected to the third main body portion, the third protruding portion protrudes in a direction away from the center of the third main body portion, and the third protruding portion at least partially exceeds the extension line of the straight side of the third main body portion close to the third protruding portion, the distance between the edge of the third color light-emitting layer and the edge of the corresponding pixel opening is increased, thereby increasing the dark stripe Margin of the third color light-emitting layer, reducing the probability of occurrence of dark stripe defects in the third color light-emitting layer, thereby improving product quality and yield.

[0154] In some examples, such as Fig.11 As shown, a first distance D1 between an outer edge of the first corner portion 133A and an outer edge of the third protrusion 293 adjacent to the first corner portion 133A away from the third main body portion 283 is greater than a second distance D2 between an outer edge of the second corner portion 133B and an outer edge of the third protrusion 293 adjacent to the second corner portion 133B away from the third main body portion 283. Thus, the display substrate can allow the third color light emitting layer adjacent to the first corner portion to have a larger color mixing margin.

[0155] For example, the difference between the first distance D1 and the second distance D2 is greater than 1 micrometer, such as greater than 1.5 micrometers and less than 2 micrometers.

[0156] In some examples, such as Fig.11 As shown, the ratio of the curvature radius of the outer edge of the first corner 133A to the curvature radius of the outer edge of the third protrusion 293 adjacent to the first corner 133A away from the first corner 133A is in the range of 0.85-1.05, for example, 0.89. Thus, the display substrate can make the curvature radius of the outer edge of the first corner and the curvature radius of the outer edge of the third color light-emitting layer adjacent to the first corner away from the first corner close, thereby better avoiding the occurrence of color separation.

[0157] In some examples, such as Fig.11As shown, the ratio of the radius of curvature of the outer edge of the second corner 133B to the radius of curvature of the outer edge of the third color light emitting layer 231 adjacent to the second corner 133B and away from the second corner 133B is in the range of 0.35-0.45, for example, 0.38.

[0158] Fig.12 A schematic plan view of another display substrate provided according to an embodiment of the present disclosure. Fig.12 The display substrate shown is Figure 3 Similar to the display substrate shown in FIG. 1 , the first color light emitting layer 211 includes a protrusion 290 . Figure 3 The display substrate shown is different in that Fig.12 The third pixel opening 133 in the display substrate 100 shown includes a first corner 133A and a second corner 133B that are arranged opposite to each other, and the curvature of the outer edge of the first corner 133A is smaller than the curvature of the outer edge of the second corner 133B. Thus, the display substrate can reduce or even avoid the occurrence of color separation by making the outer edge of the first corner of the third pixel opening more rounded. In addition, the third color light-emitting layer 231 adjacent to the first corner 133A is retracted away from the outer edge of the first corner 133A, so that the difference between the third distance D3 between the outer edge of the first corner 133A and the outer edge of the third color light-emitting layer 231 adjacent to the first corner 133A away from the first corner 133A and the fourth distance D4 between the outer edge of the second corner 133B and the outer edge of the third color light-emitting layer 231 adjacent to the second corner 133B away from the second corner 133B is less than 0.5 microns. Thus, the display substrate can increase the space between the adjacent first color light-emitting layer and the third color light-emitting layer by reducing the color mixing margin of the third color light-emitting layer adjacent to the first corner away from the outer edge of the first corner, thereby further increasing the dark stripe margin of the first color light-emitting layer, further reducing the probability of dark stripe defects or horizontal mura of the first color sub-pixel, thereby improving product quality and yield. It should be noted that Fig.12 The relevant definition of the first color light emitting layer in the display substrate shown can be found in Figure 3 The description will not be repeated here.

[0159] In some examples, such as Fig.12 As shown, the third distance D3 between the outer edge of the first corner 133A and the outer edge of the third color light-emitting layer 231 adjacent to the first corner 133A away from the first corner 133A is equal to the fourth distance D4 between the outer edge of the second corner 133B and the outer edge of the third color light-emitting layer 231 adjacent to the second corner 133B away from the second corner 133B.

[0160] Fig.13Schematic diagram of a display device provided by an embodiment of the present disclosure. Fig.13 As shown, the display device 500 includes the display substrate 100 provided in any of the above examples. Thus, the display device can have higher product quality and yield.

[0161] In some examples, the display device may be any product or component with a display function, such as a television, a digital camera, a mobile phone, a watch, a tablet computer, a laptop computer, a navigator, etc., but the present embodiment is not limited thereto.

[0162] Fig.14 The schematic plan view of a mask provided in one embodiment of the present disclosure. The mask is used to form a display substrate provided in any of the above examples, and more specifically, to form a light-emitting layer in a display substrate provided in any of the above embodiments. Fig.14 As shown, the mask plate 300 includes a mask opening 310, which is configured to form a first color light-emitting layer 211, a second color light-emitting layer 221 or a third color light-emitting layer 231; the mask opening 310 includes an opening main body 312 and an opening protrusion 314 located on the opening main body 312 and protruding in a direction away from the center of the opening main body 312, and the opening protrusion 314 at least partially extends beyond the extension line of the straight edge of the opening main body 312 close to the opening protrusion 314.

[0163] Therefore, using the mask plate to form the light-emitting layer will correspondingly form a main body and a raised portion connected to the main body, the raised portion protrudes in a direction away from the center of the main body, and the raised portion at least partially exceeds the extension line of the straight side of the main body close to the raised portion. Therefore, the distance between the edge of the light-emitting layer provided with the raised portion and the edge of the corresponding pixel opening is increased, thereby increasing the dark stripe margin, reducing the probability of dark stripe defects, and thus improving product quality and yield.

[0164] There are a few points to note:

[0165] (1) In the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are involved, and other structures can refer to the general design.

[0166] (2) In the absence of conflict, features in the same embodiment or in different embodiments of the present disclosure may be combined with each other.

[0167] The above description is merely an exemplary embodiment of the present disclosure and is not intended to limit the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.

Claims

1. A display substrate, characterized in that: include: substrate substrate; as well as A plurality of pixel groups are located on the substrate, each of the pixel groups comprises: a first color sub-pixel, two second color sub-pixels and a third color sub-pixel, the first color sub-pixel and the third color sub-pixel are arranged along a first direction, the two second color sub-pixels are arranged along a second direction intersecting the first direction, a first center line connecting the first color sub-pixel and the third color sub-pixel and a second center line connecting the two second color sub-pixels intersect, Among them, the first color sub-pixel includes a first color light-emitting layer, the second color sub-pixel includes a second color light-emitting layer, and the third color sub-pixel includes a third color light-emitting layer, and at least one of the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer includes a main body and a raised portion connected to the main body, and the raised portion protrudes in a direction away from the center of the main body, and the raised portion at least partially exceeds an extension line of a straight side of the main body close to the raised portion.

2. The display substrate according to claim 1, characterized in that: The orthographic projection of the main body on the base substrate is a rounded rectangle, and the orthographic projection of the protrusion on the base substrate is located at a rounded corner of the rounded rectangle and protrudes in a direction away from the center of the rounded rectangle.

3. The display substrate according to claim 1, characterized in that: The distance between the outer edge of the protrusion away from the main body and the edge of the main body is greater than 2 micrometers.

4. The display substrate according to claim 1, characterized in that: The protrusion is away from the outer edge of the main body and contacts or overlaps with an adjacent light-emitting layer, and the adjacent light-emitting layer is the first color light-emitting layer, the second color light-emitting layer or the third color light-emitting layer adjacent to the protrusion.

5. The display substrate according to any one of claims 1 to 4, characterized in that: The first color light-emitting layer includes a first main body and a first protruding portion connected to the first main body, the first protruding portion protrudes away from the center of the first main body, and the first protruding portion at least partially exceeds the extension line of the straight side of the first main body close to the first protruding portion.

6. The display substrate according to claim 5, characterized in that: In the same pixel group, the first protrusion protrudes toward the third color light emitting layer.

7. The display substrate according to claim 6, characterized in that: In the same pixel group, the first protrusion is away from the outer edge of the first main body and contacts or overlaps with the third color light emitting layer.

8. The display substrate according to claim 5, characterized in that: The orthographic projection of the first main body on the base substrate is a first rounded rectangle, and the first protrusion is located at a rounded corner of the first rounded rectangle.

9. The display substrate according to claim 8, characterized in that: Among the first color light emitting layer, the second color light emitting layer and the third color light emitting layer, only the first color light emitting layer includes the protrusion.

10. The display substrate according to claim 9, characterized in that: The orthographic projection of the second color light emitting layer on the base substrate is a second rounded rectangle, and the orthographic projection of the third color light emitting layer on the base substrate is a third rounded rectangle.

11. The display substrate according to claim 5, characterized in that: The first color light emitting layer includes a first uniform thickness portion, a first inner reduced thickness portion and a first outer reduced thickness portion, and the orthographic projection of the first protruding portion on the base substrate overlaps with the orthographic projection of the first outer reduced thickness portion on the base substrate.

12. The display substrate according to any one of claims 1 to 4, characterized in that: The second color light-emitting layer includes a second main body and a second protruding portion connected to the second main body, the second protruding portion protrudes away from the center of the second main body, and the second protruding portion at least partially exceeds the extension line of the straight side of the second main body close to the second protruding portion.

13. The display substrate according to claim 12, characterized in that: In the same pixel group, the two second protrusions of two second color sub-pixels are arranged opposite to each other and protrude toward each other.

14. The display substrate according to claim 12, characterized in that: The orthographic projection of the second main body on the base substrate is a second rounded rectangle, and the second protrusion is located at a rounded corner of the second rounded rectangle.

15. The display substrate according to claim 14, characterized in that: The second protrusions are respectively disposed at the four rounded corners of the second rounded rectangle, and at least two of the four second protrusions at the four rounded corners of the second rounded rectangle have different sizes.

16. The display substrate according to claim 15, characterized in that: Among the first color light emitting layer, the second color light emitting layer and the third color light emitting layer, only the second color light emitting layer includes the protrusion.

17. The display substrate according to claim 16, characterized in that: The orthographic projection of the first color light emitting layer on the base substrate is a first rounded rectangle, and the orthographic projection of the third color light emitting layer on the base substrate is a third rounded rectangle.

18. The display substrate according to claim 12, characterized in that: The second color light emitting layer includes a second uniform thickness portion, a second inner reduced thickness portion and a second outer reduced thickness portion, and the orthographic projection of the second protruding portion on the base substrate overlaps with the orthographic projection of the second outer reduced thickness portion on the base substrate.

19. The display substrate according to any one of claims 1 to 4, characterized in that: The third color light-emitting layer includes a third main body and a third protruding portion connected to the third main body, the third protruding portion protrudes away from the center of the third main body, and the third protruding portion at least partially exceeds the extension line of the straight side of the third main body close to the third protruding portion.

20. The display substrate according to any one of claims 1 to 4, characterized in that: The first color light-emitting layer is formed by evaporation using a first metal mask, the second color light-emitting layer is formed by evaporation using a second metal mask, and the third color light-emitting layer is formed by evaporation using a third metal mask.

21. The display substrate according to any one of claims 1 to 4, characterized in that: The first color sub-pixel also includes a first color pixel electrode, which is configured to drive the first color light-emitting layer to emit light. The second color sub-pixel also includes a second color pixel electrode, which is configured to drive the second color light-emitting layer to emit light. The third color sub-pixel also includes a third color pixel electrode, which is configured to drive the third color light-emitting layer to emit light.

22. The display substrate according to claim 21, characterized in that: Also includes: A pixel defining layer is located on the substrate. The pixel defining layer includes a first pixel opening, a second pixel opening and a third pixel opening. The first pixel opening is configured to expose a portion of the first color pixel electrode layer, and the first color light emitting layer is disposed in contact with the first color pixel electrode through the first pixel opening. The second pixel opening is configured to expose a portion of the second color pixel electrode layer, and the second color light emitting layer is disposed in contact with the second color pixel electrode through the second pixel opening. The third pixel opening is configured to expose a portion of the third color pixel electrode layer, and the third color light emitting layer is disposed in contact with the third color pixel electrode through the third pixel opening.

23. The display substrate according to claim 22, characterized in that: The first color light-emitting layer includes a first uniform thickness portion, a first inner thinning thickness portion, and a first outer thinning thickness portion; the second color light-emitting layer includes a second uniform thickness portion, a second inner thinning thickness portion, and a second outer thinning thickness portion; the third color light-emitting layer includes a third uniform thickness portion, a third inner thinning thickness portion, and a third outer thinning thickness portion; The orthographic projection of the first pixel opening on the substrate falls within the range of the orthographic projection of the first uniform thickness portion on the substrate, the orthographic projection of the second pixel opening on the substrate falls within the range of the orthographic projection of the second uniform thickness portion on the substrate, and the orthographic projection of the third pixel opening on the substrate falls within the range of the orthographic projection of the third uniform thickness portion on the substrate.

24. The display substrate according to claim 22, characterized in that: The third pixel opening includes a first corner portion and a second corner portion that are opposite to each other, and a curvature of an outer edge of the first corner portion is smaller than a curvature of an outer edge of the second corner portion.

25. The display substrate according to claim 24, characterized in that: The ratio of the radius of curvature of the outer edge of the first corner to the radius of curvature of the outer edge of the third color light-emitting layer adjacent to the first corner and away from the first corner is in the range of 0.9-1.

1.

26. The display substrate according to claim 24, characterized in that: The ratio of the radius of curvature of the outer edge of the second corner to the radius of curvature of the outer edge of the third color light-emitting layer adjacent to the second corner and away from the second corner is in the range of 0.25-0.

40.

27. The display substrate according to claim 24, characterized in that: The third color light emitting layer includes a third main body and a third protruding portion connected to the third main body, wherein the third protruding portion protrudes in a direction away from the center of the third main body, and the third protruding portion at least partially exceeds an extension line of a straight side of the third main body close to the third protruding portion. A first distance between an outer edge of the first corner and an outer edge of the third protrusion adjacent to the first corner away from the third main body portion is greater than a second distance between an outer edge of the second corner and an outer edge of the third protrusion adjacent to the second corner away from the third main body portion.

28. The display substrate according to claim 27, characterized in that: A difference between the first distance and the second distance is greater than 1 micron.

29. The display substrate according to claim 27, characterized in that: The ratio of the curvature radius of the outer edge of the first corner portion to the curvature radius of the outer edge of the third protrusion adjacent to the first corner portion and away from the first corner portion is in the range of 0.85-1.

05.

30. The display substrate according to claim 27, characterized in that The ratio of the radius of curvature of the outer edge of the second corner to the radius of curvature of the outer edge of the third color light-emitting layer adjacent to the second corner and away from the second corner is in the range of 0.35-0.

45.

31. The display substrate according to claim 24, characterized in that The third color light-emitting layer adjacent to the first corner is retracted away from the outer edge of the first corner so that the difference between the third distance between the outer edge of the first corner and the outer edge of the third color light-emitting layer adjacent to the first corner away from the first corner and the fourth distance between the outer edge of the second corner and the outer edge of the third color light-emitting layer adjacent to the second corner away from the second corner is less than 0.5 microns.

32. The display substrate according to claim 31, characterized in that: A third distance between the outer edge of the first corner and the outer edge of the third color light-emitting layer adjacent to the first corner away from the first corner is equal to a fourth distance between the outer edge of the second corner and the outer edge of the third color light-emitting layer adjacent to the second corner away from the second corner.

33. The display substrate according to any one of claims 1 to 4, characterized in that: The first color light emitting layer is configured to emit red light, the second color light emitting layer is configured to emit green light, and the third color light emitting layer is configured to emit blue light.

34. A display device, characterized in that: Comprising a display substrate according to any one of claims 1-33.

35. A mask plate for forming a display substrate according to any one of claims 1 to 33, characterized in that: The mask plate comprises: The mask opening is configured to form the first color light-emitting layer, the second color light-emitting layer or the third color light-emitting layer, The mask opening includes an opening main body and an opening protrusion located on the opening main body and protruding in a direction away from the center of the opening main body, and the opening protrusion at least partially exceeds an extension line of a straight side of the opening main body close to the opening protrusion.

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