Display substrate and display device

Abstract

The invention provides a display substrate and a display device. The display substrate comprises: a substrate; the pixel limiting layer is located on one side of the substrate, the pixel limiting layer comprises a plurality of pixel limiting parts, and a plurality of pixel openings are defined by the plurality of pixel limiting parts; the light-emitting layer is located on the side, away from the substrate, of the pixel limiting layer, the light-emitting layer comprises a plurality of light-emitting elements, and the light-emitting elements are located in the pixel openings respectively; the black matrix is located on the side, away from the substrate, of the light-emitting layer, the black matrix comprises a first surface away from the substrate, and at least one part of the first surface comprises a convex cambered surface protruding in the direction away from the substrate.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies, and in particular, to a display substrate and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) display panels have the advantages of self-luminescence, high contrast, wide viewing angle, fast response speed, thinness, lightness, and foldability, etc., and are one of the main research directions in the current display field. As the viewing angle of an OLED display panel increases, the brightness gradually decays, resulting in a lower light-emitting brightness of the display panel at a large viewing angle and affecting the large-viewing-angle display effect of the display panel.

[0003] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those skilled in the art. Summary of the Invention

[0004] In one aspect, a display substrate is provided, which includes:

[0005] A substrate;

[0006] A pixel defining layer located on one side of the substrate, the pixel defining layer including a plurality of pixel defining parts that define a plurality of pixel openings;

[0007] A light-emitting layer located on the side of the pixel defining layer away from the substrate, the light-emitting layer including a plurality of light-emitting elements respectively located in the plurality of pixel openings; and

[0008] A black matrix, the black matrix being located on the side of the light-emitting layer away from the substrate, the black matrix including a first surface away from the substrate, and at least a part of the first surface including a convex arc surface protruding in a direction away from the substrate.

[0009] According to some exemplary embodiments, the black matrix has a first thickness in a first direction, the first thickness being in the range of 1 micrometer to 2 micrometers, and the first direction being parallel to the light-emitting direction of the display substrate.

[0010] According to some exemplary embodiments, the convex arc surface has a first radius of curvature, and the ratio of the first radius of curvature to the first thickness is in the range of 0.5 to 3.

[0011] According to some exemplary embodiments, in a first direction, the black matrix has a first thickness, and the surface of the black matrix close to the substrate and the surface of the light-emitting layer far from the substrate are spaced apart by a first spacing distance. The ratio of the first spacing distance to the first thickness is in the range of 5.5 to 25, and the first direction is parallel to the light-emitting direction of the display substrate.

[0012] According to some exemplary embodiments, the black matrix has a first thickness in a first direction, and the display substrate includes a packaging layer located between the black matrix and the light-emitting layer. The packaging layer includes: a first inorganic packaging layer on the side of the light-emitting layer far from the substrate; an organic packaging layer on the side of the first inorganic packaging layer far from the substrate; and a second inorganic packaging layer on the side of the organic packaging layer far from the substrate.

[0013] Wherein, the organic packaging layer has a second thickness in the first direction, and the ratio of the second thickness to the first thickness is in the range of 4 to 17, and the first direction is parallel to the light-emitting direction of the display substrate.

[0014] According to some exemplary embodiments, the display substrate further includes a touch layer located between the black matrix and the packaging layer. The touch layer has a third thickness in the first direction, and the ratio of the third thickness to the first thickness is in the range of 1.5 to 6.

[0015] According to some exemplary embodiments, the black matrix has a first thickness in a first direction, and the light-emitting layer includes: a first electrode layer; a light-emitting functional layer on the side of the first electrode layer far from the substrate; and a second electrode layer on the side of the light-emitting functional layer far from the substrate.

[0016] Wherein, the second electrode layer has a fourth thickness in the first direction, and the ratio of the fourth thickness to the first thickness is in the range of 0.005 to 0.016, and the first direction is parallel to the light-emitting direction of the display substrate.

[0017] According to some exemplary embodiments, the material of the second electrode layer includes a magnesium-silver metal mixture, and the mass ratio of magnesium to silver in the magnesium-silver metal mixture is in the range of 0.03 to 0.43.

[0018] According to some exemplary embodiments, the orthographic projection of the black matrix on the substrate falls within the orthographic projection of the pixel defining layer on the substrate.

[0019] According to some exemplary embodiments, the display substrate further includes a color filter layer located on a side of the black matrix away from the substrate, the color filter layer includes a plurality of color filter portions, and at least a part of the black matrix is located between two adjacent color filter portions; and

[0020] A positive projection of the black matrix on the substrate at least partially overlaps a positive projection of an adjacent color filter portion on the substrate.

[0021] On the other hand, a display device is provided, including the display substrate according to any one of the above. Description of the Drawings

[0022] Through the following description of the embodiments of the present disclosure with reference to the drawings, the above content and other objects, features, and advantages of the present disclosure will become clearer. In the drawings:

[0023] Figure 1 is a schematic structural diagram of a display substrate according to an exemplary embodiment of the present disclosure;

[0024] Figure 2 is a schematic diagram of a light output path of a display substrate according to an exemplary embodiment of the present disclosure;

[0025] Figure 3 is a relationship diagram of brightness and viewing angle of different display substrates according to an exemplary embodiment of the present disclosure;

[0026] Figure 4 is a schematic structural diagram of a light-emitting layer of a display substrate according to an exemplary embodiment of the present disclosure;

[0027] Figure 5 is a brightness contrast diagram of different viewing angles of a display substrate under the microcavity effect according to an exemplary embodiment of the present disclosure;

[0028] Figure 6 is a relationship diagram of a viewable angle and brightness of a display substrate according to an exemplary embodiment of the present disclosure;

[0029] Figure 7 is a schematic structural diagram of a display substrate according to an exemplary embodiment of the present disclosure;

[0030] Figure 8 is a relationship diagram of brightness and viewing angle of different display substrates according to an exemplary embodiment of the present disclosure;

[0031] Figure 9 is a schematic structural diagram of a display substrate according to an exemplary embodiment of the present disclosure;

[0032] Figure 10 is a relationship diagram of brightness and viewing angle of different display substrates according to an exemplary embodiment of the present disclosure;

[0033] Figure 11 is a transmittance comparison diagram of a second electrode layer with different thicknesses;

[0034] Figure 12 is a relationship diagram of the brightness and viewing angle of different display substrates according to an exemplary embodiment of the present disclosure;

[0035] Figure 13 is a transmittance comparison diagram of a second electrode layer with different metal mixing ratios;

[0036] Figure 14 is a relationship diagram of the brightness and viewing angle of different display substrates according to an exemplary embodiment of the present disclosure; and

[0037] Figure 15 is a structural block diagram of a display device according to an embodiment of the present disclosure.

[0038] It should be noted that, for clarity, in the drawings used to describe the embodiments of the present disclosure, the dimensions of layers, structures, or regions may be enlarged or reduced, that is, these drawings are not drawn to actual scale. Detailed Description of the Embodiments

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure. Apparently, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0040] It should be noted that in the drawings, for clarity and / or for the purpose of description, the dimensions of elements may be enlarged and relative dimensions. Thus, the dimensions and relative dimensions of the respective elements need not be limited to the dimensions and relative dimensions shown in the figures. In the specification and drawings, the same or similar reference numerals indicate the same or similar components.

[0041] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the ordinary meaning as understood by those of ordinary skill in the art. The "first", "second", and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or items appearing before this term cover the elements or items listed after this term and their equivalents, without excluding other elements or items.

[0042] In this document, unless otherwise specifically stated, directional terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to represent the orientation or positional relationship based on the orientation shown in the drawings, and are only for the convenience of describing the present disclosure, rather than indicating or implying that the device, element or component referred to must have a specific orientation, be constructed or operate in a specific orientation. It should be understood that when the absolute position of the object being described changes, the relative positional relationship they represent may also change accordingly. Therefore, these directional terms should not be construed as a limitation to the present disclosure.

[0043] Those skilled in the art should understand that in this document, unless otherwise stated, the expressions "height" or "thickness" refer to the dimension along the surface of each film layer arranged perpendicular to the substrate, that is, the dimension along the light-emitting direction of the display substrate, or the dimension along the normal direction of the display device.

[0044] As the market share of OLED panels in the display field, especially in the mobile display field (such as products like mobile phones and smart bracelets), gradually increases, consumers' requirements for OLED panels are becoming more and more stringent. As the third-generation display technology, compared with traditional liquid crystal displays (LCDs), the flexible OLED panel can be bent and folded, which is a very significant application advantage. In recent years, folding mobile phones have been continuously innovated and have received more and more consumers' favor. Folding mobile phones further demonstrate the unique advantages of flexible OLED screens. In order to pursue better folding performance, folding screens are constantly striving to be lighter and thinner. The technology of removing the polarizer (POL-less), that is, the COE (Color Filter on Encapsulation) technology, can significantly reduce the thickness of the flexible OLED panel (for example, reduce by about 100 μm). This technology fits perfectly with folding screens and is thus used in more and more folding screens. In some OLED display products, due to the occlusion of the black matrix, as the viewing angle of the observer increases, the brightness of the OLED display panel gradually decays, resulting in a lower light-emitting brightness of the display panel at a large viewing angle and affecting the large-viewing-angle display effect of the display panel.

[0045] Based on this, embodiments of the present disclosure provide a display substrate. Specifically, the display substrate may include: a substrate substrate; a pixel defining layer located on one side of the substrate substrate, the pixel defining layer including a plurality of pixel defining portions that define a plurality of pixel openings; a light-emitting layer located on the side of the pixel defining layer away from the substrate substrate, the light-emitting layer including a plurality of light-emitting elements respectively located in the plurality of pixel openings; and a black matrix located on the side of the light-emitting layer away from the substrate substrate, the black matrix including a first surface away from the substrate substrate, at least a part of the first surface including a convex arc surface protruding in a direction away from the substrate substrate.

[0046] Through such a design, the light-blocking ratio of the black matrix to the light emission at large viewing angles can be reduced, which is beneficial to improving the light-emitting brightness of the display panel at large viewing angles, thereby enhancing the display effect of the display panel with wide viewing angles, being beneficial to improving the product competitiveness, and improving the user experience.

[0047] Figure 1 is a schematic structural diagram of a display substrate according to an exemplary embodiment of the present disclosure, Figure 2 is a schematic diagram of the light-emitting path of a display substrate according to an exemplary embodiment of the present disclosure, Figure 3 is a relationship diagram of the brightness and viewing angle of different display substrates according to an exemplary embodiment of the present disclosure.

[0048] Exemplarily, in an embodiment of the present disclosure, referring to Figure 1 , the display substrate 100 may include a substrate 1; a light-emitting layer 2 located on one side of the substrate 1; a black matrix 5 located on the side of the light-emitting layer 2 away from the substrate 1; and a color filter layer 6 located on the side of the black matrix 5 away from the substrate 1. The color filter layer 6 may include a plurality of color filter portions 60. For example, the plurality of color filter portions 60 may include a plurality of first color filter portions 61, a plurality of second color filter portions 62, and a plurality of third color filter portions 63.

[0049] Exemplarily, the first color filter portion 61 may be a red filter portion, the second color filter portion 62 may be a green filter portion, and the third color filter portion 63 may be a blue filter portion.

[0050] By providing color filter portions of multiple colors, the light emission of pixels of different colors can be filtered, and the reflectivity of the display panel can also be reduced, thereby ensuring a relatively high light-emitting purity of the pixels, eliminating the need for an additional polarizer, being beneficial to the thinning of the display substrate, and being conducive to the flexible design of the display product.

[0051] Exemplarily, the display substrate 100 may further include a packaging layer 3 and a touch layer 4 located between the light-emitting layer 2 and the black matrix 5.

[0052] Exemplarily, the display substrate 100 may further include a planarization layer 7, an optical adhesive layer 8, and a protective layer 9 located on the side of the color filter layer 6 away from the substrate.

[0053] In some OLED display panels, multiple color filter portions are used to replace the polarizer of traditional products. In order to reduce the reflectivity of the display panel, prevent ambient light from affecting the image quality performance of the display panel in the dark state (low brightness), and reduce the light crosstalk between adjacent pixels, a black matrix needs to be provided between adjacent pixels.

[0054] Exemplarily, referring to Figure 2, the display substrate 100 may include a pixel definition layer PDL located on the substrate 1, and the pixel definition layer PDL includes a plurality of pixel definition portions PDL0. The plurality of pixel definition portions PDL0 define a plurality of pixel openings VH.

[0055] The light-emitting layer 2 is located on the side of the pixel definition layer PDL away from the substrate 1, and the light-emitting layer 2 may include a plurality of light-emitting elements 20. For example, the plurality of light-emitting elements 20 may include a plurality of first light-emitting elements 21, a plurality of second light-emitting elements 22, and a plurality of third light-emitting elements 23.

[0056] Exemplarily, the first light-emitting element 21 includes a red OLED light-emitting device.

[0057] Exemplarily, the second light-emitting element 22 includes a green OLED light-emitting device.

[0058] Exemplarily, the third light-emitting element 23 includes a blue OLED light-emitting device.

[0059] In some embodiments, at least a part of the plurality of first light-emitting elements 21, the plurality of second light-emitting elements 22, and the plurality of third light-emitting elements 23 may include white OLED light-emitting devices.

[0060] Exemplarily, the plurality of color filter portions 60 and the plurality of light-emitting elements 20 may be arranged in one-to-one correspondence. For example, one pixel may include one light-emitting element 20 and one color filter portion 60. By controlling the light-emitting color of the light-emitting element in the pixel and the type of the color filter portion, the light-emitting color of the pixel is controlled. For example, a red pixel may include one first light-emitting element 21 and one first color filter portion 61, so that the pixel emits red light outward.

[0061] Exemplarily, at least a part of the black matrix 5 is disposed between two adjacent color filter portions. For example, the plurality of color filter portions may be arranged in an array, and the shape of the orthographic projection of the black matrix on the substrate includes a grid shape. At least a part of the grid-shaped projection of the black matrix falls into the gap region of the orthographic projections of two adjacent color filter portions on the substrate.

[0062] Exemplarily, the material of the black matrix may include materials with low transmittance such as metal thin film chromium and black resin, so that the light emitted by the underlying light-emitting elements can be blocked to a certain extent, which is beneficial to reducing the crosstalk between adjacent pixels, and at the same time reducing the reflectivity of the display substrate and improving the dark state display effect of the display product.

[0063] However, the setting of the black matrix will exacerbate the brightness attenuation speed of the display substrate at a large viewing angle, so that the brightness difference of the display product at a large viewing angle relative to the brightness at a 0° viewing angle is exacerbated. For example, referring to Figure 3, Curve S1 shows a relationship diagram of the brightness and viewing angle of a display substrate that uses a color filter unit to replace a polarizer, and curve S2 shows a relationship diagram of the brightness and viewing angle of a display substrate that uses a polarizer. Through comparison, it can be found that: the brightness of the display substrate corresponding to curve S1 with a color filter unit at a large viewing angle is lower than that of the display substrate corresponding to curve S2 with a polarizer at a large viewing angle. For example, the remaining brightness of the display substrate corresponding to curve S1 with a color filter unit at a 60° viewing angle is approximately 12.3%, while the remaining brightness of the display substrate corresponding to curve S2 with a polarizer at a 60° viewing angle is approximately 22.1%. The remaining brightness of the display substrate corresponding to curve S1 with a color filter unit near a 75° viewing angle is approximately 5.1%, and the remaining brightness of the display substrate corresponding to curve S2 with a polarizer at a 75° viewing angle is approximately 12.1%. Through comparison, it can be known that for the display substrate with a color filter unit, due to the introduction of the black matrix structure, the brightness attenuation at a large viewing angle of the display substrate is aggravated, resulting in a darker brightness of the display product at a large viewing angle and weakening the wide viewing angle advantage of the OLED product.

[0064] It should be noted that in the embodiments of the present disclosure, the "remaining brightness" refers to the ratio of the remaining light-emitting brightness of the display substrate at a large viewing angle to the light-emitting brightness at a 0° viewing angle.

[0065] It should also be noted that in the embodiments of the present disclosure, the large viewing angle is a viewing angle relative to the front viewing angle. For example, the large viewing angle can include a viewable angle range from -75° to -30° and from 30° to 75°.

[0066] In some embodiments, the black matrix 5 is designed in a frustum shape. For example, referring to Figure 2 , the cross-sectional shape of at least a part of the black matrix 5 in a plane parallel to the light-emitting direction of the display substrate is trapezoidal. For example, the black matrix 5 includes a plurality of black matrix units 50 located between adjacent color filter units. The cross-sectional shape of the black matrix unit 50 in a plane parallel to the light-emitting direction of the display substrate is trapezoidal. With such a design, the side surface 52 of the black matrix 5 has a relatively high height, and the blocking ratio of the light emitted at a large viewing angle is relatively high. For example, at least a part of the light on the right side is blocked by the side surface 52 of the trapezoidal black matrix unit, resulting in an aggravated attenuation of the light-emitting brightness at a large viewing angle.

[0067] The inventor has found through research that: in addition to the black matrix blocking the light emitted at a large viewing angle, resulting in a serious attenuation of the light-emitting brightness at a large viewing angle, in some OLED display panels, there is also a microcavity effect in the light-emitting devices in the light-emitting layer, resulting in a more serious attenuation of the brightness at a large viewing angle.

[0068] Figure 4 is a schematic structural diagram of the light-emitting layer of a display substrate according to an exemplary embodiment of the present disclosure, Figure 5It is a brightness contrast diagram of a display substrate at different viewing angles under the microcavity effect according to an exemplary embodiment of the present disclosure. Figure 6 It is a relationship diagram of the viewing angle and brightness of a display substrate according to an exemplary embodiment of the present disclosure.

[0069] Exemplarily, in the embodiment of the present disclosure, referring to Figure 4 , the light-emitting device in the light-emitting layer 2 can be an OLED light-emitting device.

[0070] Exemplarily, the light-emitting layer 2 may include: a first electrode layer 201 on one side of the substrate 1; a light-emitting functional layer 202 on the side of the first electrode layer 201 away from the substrate 1; and a second electrode layer 203 on the side of the light-emitting functional layer 202 away from the substrate 1.

[0071] Exemplarily, the first electrode layer 201 can be the anode of the light-emitting device, and the second electrode layer 203 can be the cathode of the light-emitting device.

[0072] Exemplarily, the light-emitting functional layer 202 may include a plurality of stacked film layers. For example, the light-emitting functional layer 202 may include a hole transport layer 2021, an electron blocking layer 2022, a first light-emitting layer 2023, a hole blocking layer 2024, and an electron transport layer 2025 sequentially arranged away from the first electrode layer 201.

[0073] It should be noted that in the embodiment of the present disclosure, although the light-emitting functional layer 202 is schematically shown to include a hole transport layer 2021, an electron blocking layer 2022, a first light-emitting layer 2023, a hole blocking layer 2024, and an electron transport layer 2025, the embodiment of the present disclosure is not limited thereto. In the embodiment of the present disclosure, the light-emitting functional layer 202 can add or reduce some film layers as needed.

[0074] The inventors have found through research that: a strong microcavity structure will be formed between the cathode (such as the second electrode layer 203) and the anode (such as the first electrode layer 201) of the OLED device, thereby generating a microcavity effect, which affects the light output intensity of the pixel. Further research has found that: the microcavity effect is most significant at the normal viewing angle (near the 0° viewing angle), and its effect gradually attenuates as the viewing angle increases. Therefore, as the viewing angle increases, the brightness of the OLED device will gradually attenuate. For example, referring to Figure 5 , the abscissa is the wavelength, and the ordinate is the relative light output intensity, which shows a comparison diagram of the relative light output intensity of a reference light-emitting device and a light-emitting device at different viewing angles. Among them, the reference light-emitting device includes a device using photoluminescence. For example, the reference light-emitting device uses photoluminescence technology to excite the light-emitting material to emit light externally. Since there is no need for a cathode and an anode in the reference light-emitting device, there is no microcavity effect either. From Figure 5As can be seen, the microcavity effect is most significant at a viewing angle of 0° relative to the reference light-emitting device. Therefore, the relative light output intensity is the highest at a viewing angle of 0°. As the viewing angle increases, the effect of the microcavity effect gradually weakens, and the relative light output intensity also gradually decreases. For example, the relative light output intensity at a viewing angle of 30° is lower than that at a viewing angle of 0°; the relative light output intensity at a viewing angle of 45° is lower than that at a viewing angle of 30°; the relative light output intensity at a viewing angle of 60° is lower than that at a viewing angle of 45°. Therefore, the microcavity effect caused by the microcavity structure will further exacerbate the difference in light output brightness between large viewing angles and normal viewing angles.

[0075] Exemplarily, referring to Figure 6 , the abscissa is the viewable angle and the ordinate is the relative light output brightness. From Figure 6 it can be seen that the light output brightness of the display panel is the largest at a viewing angle of 0°. As the viewing angle increases, the light output brightness gradually decreases. This may cause the display image of the display panel to be dim at large viewing angles, resulting in poor display effects.

[0076] To improve the problem of large differences in brightness between large viewing angles and normal viewing angles caused by the above-mentioned black matrix and microcavity effect, the embodiments of the present disclosure optimize the structure of the display panel from at least one of the two aspects of the black matrix and the microcavity effect.

[0077] Exemplarily, in some embodiments of the present disclosure, by optimizing one or more parameters such as the structure, size of the black matrix and / or adjusting the spacing distance between the black matrix and the light-emitting layer, the shielding ratio of the black matrix to the light output at large viewing angles can be reduced, thereby improving the light output brightness of the display panel at large viewing angles and enhancing the display effect of the display panel at large viewing angles.

[0078] Figure 7 is a schematic structural diagram of a display substrate according to an exemplary embodiment of the present disclosure, Figure 8 is a relationship diagram of the brightness and viewing angle of different display substrates according to an exemplary embodiment of the present disclosure.

[0079] Exemplarily, in an embodiment of the present disclosure, referring to Figure 7 , a display substrate 100 is provided. The display substrate 100 may include: a substrate 1; a pixel defining layer PDL located on one side of the substrate 1, the pixel defining layer PDL includes a plurality of pixel defining portions PDL0, and the plurality of pixel defining portions PDL0 define a plurality of pixel openings VH; a light-emitting layer 2 located on the side of the pixel defining layer PDL away from the substrate 1, the light-emitting layer 2 includes a plurality of light-emitting elements 20, and the plurality of light-emitting elements 20 are respectively located in the plurality of pixel openings VH; and a black matrix 5, the black matrix 5 is located on the side of the light-emitting layer 2 away from the substrate 1.

[0080] Exemplarily, the black matrix 5 includes a first surface 51 away from the substrate 1, and at least a part of the first surface 51 includes a convex arc surface protruding in a direction away from the substrate 1.

[0081] Exemplarily, the shape of the orthographic projection of the black matrix 5 on the substrate includes a grid shape. The black matrix 5 may include black matrix cells 50 located between adjacent color filter portions 60.

[0082] Exemplarily, the shape of the black matrix cell 50 may include a part of a sphere. For example, at least a part of the first surface 51 of the black matrix 5 adopts an arc design.

[0083] By using a black matrix with an arc design, without reducing the width of the black matrix, the influence on light at a large viewing angle can be reduced to a certain extent. For example, with reference to Figure 2 and Figure 7 , in a display substrate with a black matrix having a frustum shape design, part of the light emitted by the second light-emitting element 22 towards the first side (for example, part of the light emitted towards the vicinity of the viewing angle θ1 on the left side) will be blocked by the side surface 52 of the black matrix 5, so that it cannot be emitted outward, resulting in a lower light-emitting brightness near this viewing angle; while using the black matrix with an arc design provided by the embodiments of the present disclosure, while ensuring the same light-blocking effect on the front light emission, the blocking ratio of the black matrix 5 to the emitted light at a large viewing angle can be reduced. For example, part of the light emitted by the second light-emitting element 22 towards the first side (for example, part of the light emitted towards the vicinity of the viewing angle θ1 on the left side) will not be blocked by the black matrix, so that the emitted light can be captured by the human eye, and thus the brightness at a large viewing angle can be increased to a certain extent, which is beneficial to improving the large-viewing-angle display effect of the display product and enhancing the user experience.

[0084] Exemplarily, with reference to Figure 8 , curve S3 is a relationship diagram of the viewing angle and brightness of a display substrate including a black matrix with an arc design, and curve S4 is a relationship diagram of the viewing angle and brightness of a display substrate including a black matrix with a frustum shape design. By comparing curve S3 and curve S4, it can be seen that at the same large viewing angle, the brightness of the display substrate corresponding to curve S3 (this display substrate includes a black matrix with an arc design) is higher than the brightness of the display substrate corresponding to curve S4 (this display substrate uses a black matrix with a frustum shape design). For example, near the 45° viewing angle, the remaining brightness of the display substrate corresponding to curve S3 is about 38%, while the remaining brightness of the display substrate corresponding to curve S4 is about 31.6%. It can be seen from this that using a black matrix with an arc design can significantly improve the brightness of the display substrate at a large viewing angle, and thus can improve the large-viewing-angle display effect of the display substrate.

[0085] It should be noted that in the embodiments of the present disclosure, the "remaining brightness" refers to the ratio of the remaining light-emitting brightness of the display substrate at a large viewing angle to the light-emitting brightness at a 0° viewing angle.

[0086] Exemplarily, the orthographic projections of the plurality of black matrices 5 on the substrate substrate 1 respectively fall within the orthographic projections of the plurality of pixel defining portions PDL0 on the substrate substrate 1.

[0087] Exemplarily, the orthographic projection of the black matrix 5 on the substrate substrate 1 does not overlap with the orthographic projection of the light-emitting element 20 on the substrate substrate 1.

[0088] In some embodiments, the light-blocking effect of the black matrix on large-angle light emission can be reduced to a certain extent by adjusting the thickness of the black matrix (for example, reducing the thickness of the black matrix) and / or adjusting the radius of curvature of the convex arc surface of the black matrix (for example, increasing the radius of curvature of the convex arc surface of the black matrix).

[0089] Exemplarily, continue to refer to Figure 7 , the black matrix 5 has a first thickness H1 in the first direction Z, and the first thickness H1 is in the range of 1 micron to 2 microns. The first direction Z is parallel to the light-emitting direction of the display substrate. For example, the first thickness H1 is about 1 micron, 1.2 microns, 1.5 microns, 1.8 microns or 2 microns.

[0090] It should be noted that in the embodiments of the present disclosure, the first thickness H1 of the black matrix refers to the maximum thickness of the black matrix H1 in the first direction Z. For example, the first thickness H1 of the black matrix refers to the distance between the vertex of the first surface 51 that is farthest from the substrate substrate and the surface of the black matrix close to the substrate substrate.

[0091] Through such a design, the light-blocking effect of the black matrix on large-angle light emission can be reduced, which is beneficial to improving the large-angle brightness of the display substrate and enhancing the large-angle display effect of the display substrate.

[0092] Exemplarily, the convex arc surface (for example, a part of the first surface 51) in the black matrix 5 has a first radius of curvature, and the ratio of the first radius of curvature to the first thickness H1 is in the range of 0.5 to 3.

[0093] Exemplarily, the first thickness is in the range of 1 micron to 2 microns, and the first radius of curvature is in the range of 1 micron to 3 microns. For example, the first radius of curvature is about 1 micron, 1.8 microns, 2 microns, 2.4 microns or 3 microns.

[0094] Through such a design, without changing the width, the height of the black matrix in the first direction can be reduced, thereby improving the brightness at a large viewing angle. For example, the brightness at a 45° viewing angle can be increased by about 2% to 5%.

[0095] In some embodiments, the relative areas of the black matrix and the pixel region (i.e., the light-emitting region) can also be adjusted to improve the large-angle light-emitting brightness of the display substrate. For example, the area of the pixel light-emitting region can be increased or the area of the orthographic projection of the black matrix on the substrate can be decreased, so as to increase the aperture ratio of the display substrate, thereby improving the large-angle light-emitting brightness of the display substrate.

[0096] In some embodiments, the shielding ratio of the black matrix to the large-angle light emission of the light-emitting element can also be reduced by decreasing the spacing between the black matrix and the light-emitting layer, thereby improving the large-angle light-emitting brightness of the display substrate.

[0097] Exemplarily, in the first direction Z, a surface 53 of the black matrix 5 close to the substrate 1 and a surface 208 of the light-emitting layer 2 far from the substrate 1 are spaced apart by a first spacing distance D1, and the first direction Z is parallel to the light-emitting direction of the display substrate.

[0098] Exemplarily, the ratio of the first spacing distance D1 to the first thickness H1 is in the range of 5.5 to 25.

[0099] Exemplarily, the first thickness H1 is in the range of 1 micrometer to 2 micrometers, and the first spacing distance D1 is in the range of 11 micrometers to 25 micrometers. For example, the first spacing distance D1 is about 11 micrometers, 13 micrometers, 18 micrometers, 21 micrometers or 25 micrometers.

[0100] By decreasing the spacing between the black matrix and the light-emitting layer, the shielding ratio of the black matrix to the light emitted at a large angle by the light-emitting element can be reduced, so that the light-emitting amount of the display substrate at a large angle increases, which is beneficial to improving the large-angle display effect of the display substrate.

[0101] It should be noted that, in the embodiments of the present disclosure, the "first spacing distance D1" refers to the average spacing between a surface 53 of the black matrix 5 close to the substrate 1 and a surface 208 of the light-emitting layer 2 far from the substrate 1.

[0102] In some embodiments, the display substrate may include a plurality of film layers located between the black matrix and the light-emitting layer. The spacing between the black matrix and the light-emitting layer can be decreased by reducing the thickness of at least a part of the plurality of film layers between the black matrix and the light-emitting layer, thereby improving the large-angle light-emitting brightness of the display substrate.

[0103] Figure 9 is a schematic structural diagram of a display substrate according to an exemplary embodiment of the present disclosure, Figure 10 is a graph showing the relationship between the brightness and viewing angle of different display substrates according to an exemplary embodiment of the present disclosure.

[0104] Exemplarily, in the embodiments of the present disclosure, with reference to Figure 9, the display substrate 100 may include a packaging layer 3 located between the black matrix 5 and the light-emitting layer 2. The packaging layer 3 may include: a first inorganic packaging layer 31 on the side of the light-emitting layer 2 away from the substrate 1; an organic packaging layer 32 on the side of the first inorganic packaging layer 31 away from the substrate 1; and a second inorganic packaging layer 33 on the side of the organic packaging layer 32 away from the substrate 1.

[0105] Exemplarily, the organic packaging layer 32 has a second thickness H2 in the first direction Z. The ratio of the second thickness H2 to the first thickness H1 is in the range of 4 to 17, and the first direction Z is parallel to the light-emitting direction of the display substrate.

[0106] Exemplarily, the first thickness H1 is in the range of 1 μm to 2 μm, and the second thickness H2 is in the range of 8 μm to 17 μm. For example, the second thickness H2 is about 8 μm, 10 μm, 12 μm, 13 μm, or 17 μm.

[0107] By reducing the thickness of the organic packaging layer, the spacing distance between the black matrix and the light-emitting layer can be reduced, thereby reducing the shielding ratio of the black matrix to the large-angle emitted light of the light-emitting element, which is beneficial to improving the large-angle light-emitting brightness of the display substrate.

[0108] Exemplarily, referring to Figure 10 , the thickness of the organic packaging layer of the display substrate corresponding to curve S5 is about 8 μm, and the thickness of the organic packaging layer of the display substrate corresponding to curve S6 is about 12 μm.

[0109] The thickness of the organic packaging layer of the display substrate corresponding to curve S5 is reduced by 4 μm compared to the organic packaging layer of the display substrate corresponding to curve S6. At the same viewing angle (e.g., 45° viewing angle), the remaining brightness of the display substrate corresponding to curve S5 is about 38.8%, while the remaining brightness of the display substrate corresponding to curve S6 is about 31.6%. By thinning the thickness of the organic packaging layer, the light-emitting brightness of the display substrate at a large viewing angle can be significantly improved, which is beneficial to enhancing the large-angle display effect of the display substrate.

[0110] In some exemplary embodiments, still referring to Figure 9 , the display substrate 100 may further include a touch layer 4 located between the black matrix 5 and the packaging layer 3.

[0111] Exemplarily, the touch layer 4 has a third thickness H3 in the first direction Z, and the ratio of the third thickness H3 to the first thickness H1 is in the range of 1.5 to 6.

[0112] Exemplarily, the third thickness H3 is in the range of 3 μm to 6 μm. For example, the third thickness H3 is about 3 μm, 4 μm, 5 μm, 5.5 μm, or 6 μm.

[0113] By reducing the thickness of the touch layer, the spacing distance between the black matrix and the light-emitting layer can be decreased, thereby reducing the occlusion ratio of the large-angle outgoing light of the light-emitting elements by the black matrix, which is beneficial to improving the large-angle light-emitting brightness of the display substrate.

[0114] Table 1 shows the remaining brightness of multiple display substrates obtained by separately optimizing the structure of the black matrix, the thickness of the black matrix, the thickness of the organic encapsulation layer, and the thickness of the touch layer using the control variable method at a 45° viewing angle.

[0115] Comparison of the remaining brightness of multiple display substrates in Table 1 at a 45° viewing angle

[0116]

[0117]

[0118] Referring to Table 1, the remaining brightness of the first reference substrate T1 at a 45° viewing angle is approximately 31.6%.

[0119] The difference between the second display substrate T2 and the first reference substrate T1 is that the black matrix in the second display substrate T2 adopts an arc design. The remaining brightness of the second display substrate T2 at a 45° viewing angle is approximately 38%, which is an increase of approximately 6.4% compared to the brightness of the first reference substrate T1 at a 45° viewing angle.

[0120] The difference between the third display substrate T3 and the first reference substrate T1 is that the thickness of the black matrix in the third display substrate T3 is reduced by 0.3 micrometers compared to the thickness of the black matrix in the first reference substrate T1. The remaining brightness of the third display substrate T3 at a 45° viewing angle is approximately 34.1%, which is an increase of approximately 2.5% compared to the brightness of the first reference substrate T1 at a 45° viewing angle.

[0121] The difference between the fourth display substrate T4 and the first reference substrate T1 is that the thickness of the organic encapsulation layer in the fourth display substrate T4 is reduced by 4 micrometers compared to the thickness of the organic encapsulation layer in the first reference substrate T1. The remaining brightness of the fourth display substrate T4 at a 45° viewing angle is approximately 38.8%, which is an increase of approximately 7.2% compared to the brightness of the first reference substrate T1 at a 45° viewing angle.

[0122] The difference between the fifth display substrate T5 and the first reference substrate T1 is that the thickness of the touch layer in the fifth display substrate T5 is reduced by 1.5 micrometers compared to the thickness of the touch layer in the first reference substrate T1. The remaining brightness of the fifth display substrate T5 at a 45° viewing angle is approximately 35.2%, which is an increase of approximately 3.6% compared to the brightness of the first reference substrate T1 at a 45° viewing angle.

[0123] From the comparison results in Table 1, it can be seen that by optimizing the design of one of the structure of the black matrix, the thickness of the black matrix, the thickness of the organic encapsulation layer, and the thickness of the touch layer, the large viewing angle light emission brightness of the display substrate can be improved.

[0124] In some embodiments of the present disclosure, it is also possible to perform a combined optimization design on two or more parameters among parameters such as the structure of the black matrix, the thickness of the black matrix, the thickness of the organic encapsulation layer, and the thickness of the touch layer, so as to further improve the large viewing angle light emission brightness of the display substrate.

[0125] In some embodiments of the present disclosure, in addition to being able to optimize the design of the foregoing parameters such as the structure of the black matrix, the thickness of the black matrix, the thickness of the organic encapsulation layer, and the thickness of the touch layer, and reduce the occlusion of the black matrix on the large viewing angle light emission, it is also possible to adjust the microcavity structure in the light emitting layer to reduce the influence of the microcavity effect on the light emission difference between the normal viewing angle and the large viewing angle of the light emitting device. Thus, when the brightness at the normal viewing angle is the same, the large viewing angle light emission brightness of the display substrate is higher, thereby improving the large viewing angle display effect of the display substrate.

[0126] Exemplarily, referring back to Figure 4 , the light emitting layer 2 includes: a first electrode layer 201; a light emitting functional layer 202 located on the side of the first electrode layer 201 away from the substrate 1; and a second electrode layer 203 located on the side of the light emitting functional layer 202 away from the substrate 1.

[0127] The inventors have found through research that: the second electrode layer 203 has a relatively strong reflectivity. The microcavity effect in the light emitting layer 2 has a strong correlation with the reflectivity of the second electrode layer 203.

[0128] In some embodiments of the present disclosure, the microcavity effect in the light emitting layer can be weakened by adjusting the reflectivity of the second electrode layer 203, thereby reducing the difference in the light emission intensity of the light emitting layer at the normal viewing angle and the large viewing angle. For example, the reflectivity of the second electrode layer can be reduced by adjusting the thickness of the second electrode layer and / or adjusting the mixing ratio of different metals in the second electrode layer.

[0129] Figure 11 is a comparison chart of the transmittance of second electrode layers with different thicknesses, Figure 12 is a relationship chart of the brightness and viewing angle of different display substrates according to an exemplary embodiment of the present disclosure.

[0130] Exemplarily, referring to Figure 11 , taking the thickness of the second electrode layer of the reference group as a reference (for example, the thickness of the second electrode layer of the reference group is about 16 nanometers), the transmittance of the second electrode layer of the reference group to visible light is about 54%.

[0131] "THK-10" means that the thickness of the second electrode layer is reduced by 10 angstroms relative to the thickness of the second electrode layer in the reference group, and the transmittance of the "THK-10"-corresponding second electrode layer to visible light is about 58%.

[0132] "THK-20" means that the thickness of the second electrode layer is reduced by 20 angstroms relative to the thickness of the second electrode layer in the reference group, and the transmittance of the "THK-20"-corresponding second electrode layer to visible light is about 61%.

[0133] "THK+10" means that the thickness of the second electrode layer is increased by 10 angstroms relative to the thickness of the second electrode layer in the reference group, and the transmittance of the "THK+10"-corresponding second electrode layer to visible light is about 53%.

[0134] "THK+20" means that the thickness of the second electrode layer is increased by 20 angstroms relative to the thickness of the second electrode layer in the reference group, and the transmittance of the "THK+20"-corresponding second electrode layer to visible light is about 50%.

[0135] It can be seen from Figure 11 that the transmittance of the second electrode layer to visible light is directly related to the thickness of the second electrode layer. By reducing the thickness of the second electrode layer, the transmittance of the second electrode layer can be increased. That is to say, reducing the thickness of the second electrode layer can reduce the reflectivity of the second electrode layer, thereby reducing the microcavity effect of the light-emitting layer, which is beneficial to reducing the difference in the light-emitting intensity of the display substrate at the front view angle and the large view angle, and is beneficial to improving the large view angle display effect of the display substrate.

[0136] Exemplarily, with reference to Figure 11 and 12 , the thickness of the second electrode layer in the display substrate corresponding to curve S8 is reduced by 20 angstroms (2 nm) relative to the thickness of the second electrode layer in the display substrate corresponding to curve S7. For example, the thickness of the second electrode layer in the display substrate corresponding to curve S8 is equal to the thickness of the "THK-20" second electrode layer, and the thickness of the second electrode layer in the display substrate corresponding to curve S7 is equal to the thickness of the second electrode layer in the reference group. The brightness of the display substrate corresponding to curve S8 at a large view angle is higher than that of the display substrate corresponding to curve S7 at a large view angle. The reason is that the transmittance of the second electrode layer in the display substrate corresponding to curve S8 is higher and the reflectivity is lower. Therefore, the microcavity effect of the light-emitting layer is weakened, and the difference in the light-emitting intensity of the light-emitting element at the front view angle and the large view angle is reduced, so that when the brightness at the front view angle is the same, the large view angle light-emitting brightness of the display substrate corresponding to curve S8 is higher and the large view angle display effect is better.

[0137] Exemplarily, referring back to Figure 4, the second electrode layer 203 has a fourth thickness H4 in the first direction Z, and the ratio of the fourth thickness H4 to the first thickness H1 is in the range of 0.005 to 0.016. The first direction Z is parallel to the light-emitting direction of the display substrate.

[0138] Exemplarily, the fourth thickness H4 is in the range of 10 nanometers to 16 nanometers. For example, the fourth thickness H4 is about 10 nanometers, 11 nanometers, 12 nanometers, 13.5 nanometers, or 16 nanometers.

[0139] Figure 13 is a transmittance comparison diagram of second electrode layers with different metal mixing ratios, Figure 14 is a relationship diagram of the brightness and viewing angle of different display substrates according to an exemplary embodiment of the present disclosure.

[0140] Exemplarily, the material of the second electrode layer 203 includes a magnesium-silver metal mixture.

[0141] Since the transmittance of metallic silver is higher than that of metallic magnesium, when the thickness of the second electrode layer is kept consistent (for example, all 15 nanometers), increasing the mass proportion of silver in the magnesium-silver metal mixture can increase the transmittance of the second electrode layer.

[0142] Exemplarily, referring to Figure 13 , when the mass ratio of magnesium to silver in the second electrode layer is Mg:Ag = 0.3:9.7, the transmittance of the second electrode layer to visible light is about 58%; when the mass ratio of magnesium to silver in the second electrode layer is Mg:Ag = 0.5:9.5, the transmittance of the second electrode layer to visible light is about 56%; when the mass ratio of magnesium to silver in the second electrode layer is Mg:Ag = 1:9, the transmittance of the second electrode layer to visible light is about 54%; when the mass ratio of magnesium to silver in the second electrode layer is Mg:Ag = 2:8, the transmittance of the second electrode layer to visible light is about 51%; when the mass ratio of magnesium to silver in the second electrode layer is Mg:Ag = 3:7, the transmittance of the second electrode layer to visible light is about 47%. Therefore, the transmittance of the second electrode layer can be increased by increasing the proportion of silver in the second electrode layer of the display substrate.

[0143] Exemplarily, in combination with reference to Figure 13 and 14, the mass ratio of magnesium to silver in the second electrode layer of the display substrate corresponding to curve S9 is Mg:Ag = 0.3:9.7, and the mass ratio of magnesium to silver in the second electrode layer of the display substrate corresponding to curve S10 is Mg:Ag = 1:9. Since the second electrode layer of the display substrate corresponding to curve S9 has a higher light transmittance for visible light, the microcavity effect of the display substrate corresponding to curve S9 is weaker, and the difference in brightness between the large viewing angle and the normal viewing angle is smaller. For example, at a 45° viewing angle, the remaining brightness of the display substrate corresponding to curve S9 is about 42.7%, and the remaining brightness of the display substrate corresponding to curve S10 is about 40.7%. When the brightness at the normal viewing angle is the same, the display substrate corresponding to curve S9 has a higher light emission brightness at large viewing angles and better large viewing angle display effects.

[0144] Exemplarily, the mass ratio of magnesium to silver in the magnesium-silver metal mixture ranges from 0.03 to 0.43.

[0145] By increasing the proportion of silver in the second electrode layer, the light transmittance of the second electrode layer can be increased, thereby reducing the microcavity effect of the light-emitting layer, which is beneficial to increasing the large viewing angle brightness of the display substrate and improving the display effect of the display substrate.

[0146] Table 2 shows the remaining brightness of multiple display substrates obtained by optimizing the thickness of the second electrode layer and the magnesium-silver mixing ratio in the second electrode layer respectively using the control variable method at a 45° viewing angle.

[0147] Comparison of the remaining brightness of multiple display substrates at a 45° viewing angle in Table 2

[0148]

[0149] Referring to Table 2, the thickness of the second electrode layer 203 in the second reference substrate T6 is 15 nanometers, the mass ratio of magnesium to silver in the second electrode layer 203 is approximately Mg:Ag = 1:9, the black matrix adopts a conventional trapezoidal design, the height of the black matrix is approximately 1.3 micrometers, the thickness of the organic encapsulation layer is approximately 12 micrometers, the thickness of the touch layer is approximately 4 micrometers, and the remaining brightness of the second reference substrate T6 at a 45° viewing angle is approximately 40.7%.

[0150] The difference between the seventh display substrate T7 and the second reference substrate T6 is that: the thickness of the second electrode layer 203 in the seventh display substrate T7 is reduced by 2 nanometers. The remaining brightness of the seventh display substrate T7 at a 45° viewing angle is approximately 43.7%, which is about 3% higher than the brightness of the second reference substrate T6 at a 45° viewing angle.

[0151] The difference between the eighth display substrate T8 and the second reference substrate T6 is that the mass ratio of magnesium to silver in the second electrode layer 203 of the eighth display substrate T8 is approximately Mg:Ag = 0.3:9.7. The remaining brightness of the eighth display substrate T8 at a 45° viewing angle is approximately 42.7%, which is an increase of approximately 2% compared to the brightness of the second reference substrate T6 at a 45° viewing angle.

[0152] In the embodiments of the present disclosure, multiple parameters such as the structure of the black matrix, the thickness of the black matrix, the thickness of the organic encapsulation layer, the thickness of the touch layer, the thickness of the second electrode layer, and the mixing ratio of multiple metals in the second electrode layer can be combined and designed to further improve the large viewing angle light-emitting brightness of the display substrate and the large viewing angle display effect of the display substrate.

[0153] Exemplarily, referring back Figure 7 , the display substrate 100 may further include a color filter layer 6 located on the side of the black matrix 5 away from the substrate 1. The color filter layer 6 may include multiple color filter portions 60, and at least a part of the black matrix 5 is located between two adjacent color filter portions 60.

[0154] Exemplarily, the orthographic projection of the black matrix 5 on the substrate 1 at least partially overlaps with the orthographic projection of the adjacent color filter portion 60 on the substrate 1.

[0155] Through such a design, crosstalk between adjacent pixels can be reduced, and at the same time, the reflectivity of the display substrate can be reduced, which is beneficial to improving the dark state display effect of the display product.

[0156] Figure 15 is a structural block diagram of a display device according to an embodiment of the present disclosure.

[0157] Exemplarily, embodiments of the present disclosure further provide a display device. Referring Figure 15 , the display device 200 may include the display substrate 100 as described in any of the above. The display device may include, but is not limited to: electronic paper, mobile phone, tablet computer, monitor, laptop computer, digital photo frame, navigator, and any other product or component with a display function. It should be understood that the display device has the same beneficial effects as the display substrate provided in the foregoing embodiments.

[0158] Although some embodiments of the general concept of the present disclosure have been shown and described, those of ordinary skill in the art will understand that changes can be made to these embodiments without departing from the principles and spirit of the general concept of the present disclosure. The scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. A display substrate, characterized in that: include: substrate substrate; A pixel defining layer, located on one side of the base substrate, the pixel defining layer comprises a plurality of pixel defining portions, and the plurality of pixel defining portions define a plurality of pixel openings; A light-emitting layer is located on a side of the pixel defining layer away from the base substrate, the light-emitting layer includes a plurality of light-emitting elements, and the plurality of light-emitting elements are respectively located in the plurality of pixel openings; and A black matrix is ​​located on a side of the light-emitting layer away from the substrate, the black matrix comprises a first surface away from the substrate, and at least a portion of the first surface comprises a convex arc surface protruding in a direction away from the substrate.

2. The display substrate according to claim 1, wherein: The black matrix has a first thickness in a first direction, the first thickness is in a range of 1 micrometer to 2 micrometers, and the first direction is parallel to a light emitting direction of the display substrate.

3. The display substrate according to claim 2, wherein: The convex curved surface has a first radius of curvature, and a ratio of the first radius of curvature to the first thickness is in a range of 0.5 to 3.

4. The display substrate according to any one of claims 1 to 3, wherein: In a first direction, the black matrix has a first thickness, a surface of the black matrix close to the base substrate and a surface of the light-emitting layer away from the base substrate are separated by a first spacing distance, a ratio of the first spacing distance to the first thickness is in the range of 5.5 to 25, and the first direction is parallel to the light emitting direction of the display substrate.

5. The display substrate according to any one of claims 1 to 4, wherein: The black matrix has a first thickness in a first direction, the display substrate includes an encapsulation layer located between the black matrix and the light-emitting layer, the encapsulation layer including: a first inorganic encapsulation layer located on a side of the light-emitting layer away from the base substrate; an organic encapsulation layer located on a side of the first inorganic encapsulation layer away from the base substrate; and a second inorganic encapsulation layer located on a side of the organic encapsulation layer away from the base substrate, The organic encapsulation layer has a second thickness in a first direction, a ratio of the second thickness to the first thickness is in a range of 4 to 17, and the first direction is parallel to a light emitting direction of the display substrate.

6. The display substrate according to claim 5, wherein: The display substrate further includes a touch layer located between the black matrix and the encapsulation layer. The touch layer has a third thickness in the first direction. A ratio of the third thickness to the first thickness is in a range of 1.5 to 6.

7. The display substrate according to any one of claims 1 to 6, wherein: The black matrix has a first thickness in a first direction, the light-emitting layer comprises: a first electrode layer; a light-emitting functional layer located on a side of the first electrode layer away from the base substrate; and a second electrode layer located on a side of the light-emitting functional layer away from the base substrate, The second electrode layer has a fourth thickness in a first direction, a ratio of the fourth thickness to the first thickness is in a range of 0.005 to 0.016, and the first direction is parallel to a light emitting direction of the display substrate.

8. The display substrate according to claim 7, wherein: The material of the second electrode layer includes a magnesium-silver metal mixture, and the mass ratio of magnesium to silver in the magnesium-silver metal mixture is in a range of 0.03 to 0.

43.

9. The display substrate according to any one of claims 1 to 8, wherein: The orthographic projection of the black matrix on the base substrate falls within the orthographic projection of the pixel defining layer on the base substrate.

10. The display substrate according to any one of claims 1 to 9, wherein: The display substrate further comprises a color filter layer located on a side of the black matrix away from the base substrate, the color filter layer comprises a plurality of color filter portions, and at least a portion of the black matrix is ​​located between two adjacent color filter portions; and The orthographic projection of the black matrix on the base substrate at least partially overlaps with the orthographic projection of the adjacent color filter portion on the base substrate.

11. A display device comprising the display substrate according to any one of claims 1 to 10.

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