Display substrate, manufacturing method therefor, and display apparatus

Abstract

A display substrate, a manufacturing method therefor and a display apparatus, belonging to the technical field of display. The display substrate comprises a base substrate; a light-emitting device layer and a pixel defining layer which are located on the base substrate; and an encapsulation structure layer located on the side of the light-emitting device layer away from the base substrate. The light-emitting device layer comprises a first light-emitting unit and a second light-emitting unit. The pixel defining layer comprises a first pixel opening, a second pixel opening, a first defining part for defining the first pixel opening, and a second defining part for defining the second pixel opening, the height of the first defining part being greater than the height of the second defining part. The first light-emitting unit is located in the first pixel opening, and the second light-emitting unit is located in the second pixel opening. The encapsulation structure layer comprises a first encapsulation part corresponding to the first light-emitting unit and a second encapsulation part corresponding to the second light-emitting unit. The first encapsulation part comprises scattering particles, and the second encapsulation part comprises quantum dots and scattering particles. The present application helps to improve the light extraction efficiency of the display substrate.

Description

Display substrate and its manufacturing method, display device

[0001] This application claims priority to Chinese Patent Application No. 202411730331.0, filed on November 28, 2024, entitled "Display substrate and manufacturing method thereof, display device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of display technology, and in particular to a display substrate, its manufacturing method, and a display device. Background Technology

[0003] Quantum dot organic light emitting diode (QD-OLED) display substrates are a type of display substrate that combines OLED devices with quantum dots (QDs). The principle of QD-OLED display substrates is to use blue OLED devices to excite red QDs to emit red light and to excite green QDs to emit green light, thereby achieving full-color display. QD-OLED display substrates feature self-emissiveness, high contrast, wide color gamut, wide viewing angle, fast response speed, thinness, and foldability.

[0004] Currently, QD-OLED display substrates consist of sequentially stacked OLED device layers, encapsulation structure layers, and color conversion patterns (CCPs). The encapsulation structure layer encapsulates the OLED device layers. The OLED device layers emit blue light. CCPs include red QDs and green QDs. Red QDs emit red light when excited by the blue light emitted from the OLED device layers, and green QDs emit green light when excited by the blue light emitted from the OLED device layers.

[0005] However, in current QD-OLED display substrates, the blue light emitted by the OLED device layer needs to pass through the encapsulation structure layer to reach the CCP. The optical path from the OLED device layer to the CCP is relatively long, and the light will be lost during the process of passing through the encapsulation structure layer, resulting in low light extraction efficiency of the QD-OLED display substrate. Summary of the Invention

[0006] This application provides a display substrate, a method for manufacturing the same, and a display device, which helps to improve the light extraction efficiency of the display substrate. The technical solution of this application is as follows.

[0007] In a first aspect, a display substrate is provided, comprising:

[0008] Substrate;

[0009] The light-emitting device layer is located on the substrate and includes a first light-emitting unit and a second light-emitting unit.

[0010] A pixel defining layer is located on the substrate and includes a first pixel opening, a second pixel opening, a first defining portion for defining the first pixel opening, and a second defining portion for defining the second pixel opening. The height of the first defining portion is greater than the height of the second defining portion. The first light-emitting unit is located in the first pixel opening, and the second light-emitting unit is located in the second pixel opening.

[0011] The encapsulation structure layer is located on the side of the light-emitting device layer away from the substrate, and includes a first encapsulation part corresponding to the first light-emitting unit and a second encapsulation part corresponding to the second light-emitting unit. The first encapsulation part includes scattering particles, and the second encapsulation part includes quantum dots and scattering particles.

[0012] Optionally, the first encapsulation portion is located in the first pixel opening, and the second encapsulation portion is located in the second pixel opening.

[0013] Optionally, the light-emitting device layer includes a plurality of second light-emitting units, the pixel defining layer includes a plurality of second pixel openings, and the plurality of second light-emitting units are located one-to-one in the plurality of second pixel openings; the encapsulation structure layer includes a plurality of second encapsulation parts corresponding one-to-one with the plurality of second light-emitting units, the plurality of second encapsulation parts are an integral structure, and the first encapsulation part and the second encapsulation part are independent of each other.

[0014] Optionally, the encapsulation structure layer includes an organic encapsulation layer, which includes the first encapsulation portion and the second encapsulation portion.

[0015] Optionally, the encapsulation structure layer further includes a first inorganic encapsulation layer and a second inorganic encapsulation layer, wherein the first inorganic encapsulation layer, the organic encapsulation layer, and the second inorganic encapsulation layer are stacked sequentially.

[0016] Optionally, the height of the first limiting part is in the range of [8μm, 13μm], and the height of the second limiting part is less than or equal to 3μm.

[0017] Optionally, both the first light-emitting unit and the second light-emitting unit are used to emit light of a first color, and the quantum dots in the second encapsulation part include quantum dots of a second color and quantum dots of a third color.

[0018] The quantum dots of the second color are used to emit light of the second color when excited by light of the first color;

[0019] The third-color quantum dot is used to emit the third-color light when excited by the first-color light.

[0020] Optionally, the second light-emitting unit is also used to emit light of the second color, and the quantum dot of the third color is also used to emit light of the third color when excited by the light of the second color.

[0021] Optionally, each of the first and second light-emitting units includes a stacked first electrode, a light-emitting functional layer, and a second electrode; the light-emitting functional layer includes one light-emitting layer or multiple stacked light-emitting layers, and the light-emitting layers in the first and second light-emitting units are used to emit light of the first color.

[0022] Optionally, each of the first and second light-emitting units includes a stacked first electrode, a light-emitting functional layer, and a second electrode; the light-emitting functional layer in the first light-emitting unit includes one light-emitting layer or multiple stacked light-emitting layers, and all the light-emitting layers in the first light-emitting unit are used to emit light of the first color; the light-emitting functional layer in the second light-emitting unit includes a stacked first light-emitting layer and a second light-emitting layer, the first light-emitting layer is used to emit light of the first color, and the second light-emitting layer is used to emit light of the second color.

[0023] Optionally, the first color is blue, the second color is green, and the third color is red.

[0024] Optionally, the display substrate further includes a color filter layer located on the side of the encapsulation structure layer away from the substrate.

[0025] Optionally, both the first light-emitting unit and the second light-emitting unit are OLED light-emitting units.

[0026] Optionally, the quantum dot includes at least one of the following: group II-VI quantum dots, group IV-VI quantum dots, group III-V quantum dots, or group I-III-VI quantum dots.

[0027] Secondly, a method for manufacturing a display substrate is provided, the method comprising:

[0028] Provide substrates;

[0029] A light-emitting device layer and a pixel defining layer are formed on the substrate. The light-emitting device layer includes a first light-emitting unit and a second light-emitting unit. The pixel defining layer includes a first pixel opening, a second pixel opening, a first defining portion for defining the first pixel opening, and a second defining portion for defining the second pixel opening. The height of the first defining portion is greater than the height of the second defining portion. The first light-emitting unit is located in the first pixel opening, and the second light-emitting unit is located in the second pixel opening.

[0030] An encapsulation structure layer is formed on the side of the light-emitting device layer away from the substrate. The encapsulation structure layer includes a first encapsulation portion corresponding to the first light-emitting unit and a second encapsulation portion corresponding to the second light-emitting unit. The first encapsulation portion includes scattering particles, and the second encapsulation portion includes quantum dots and scattering particles.

[0031] Optionally, the first encapsulation portion is located in the first pixel opening, and the second encapsulation portion is located in the second pixel opening.

[0032] Optionally, the light-emitting device layer includes a plurality of second light-emitting units, the pixel defining layer includes a plurality of second pixel openings, and the plurality of second light-emitting units are located one-to-one in the plurality of second pixel openings; the encapsulation structure layer includes a plurality of second encapsulation parts corresponding one-to-one with the plurality of second light-emitting units, the plurality of second encapsulation parts are an integral structure, and the first encapsulation part and the second encapsulation part are independent of each other.

[0033] Optionally, forming an encapsulation structure layer on the side of the light-emitting device layer away from the substrate includes: forming an organic encapsulation layer on the side of the light-emitting device layer away from the substrate, the organic encapsulation layer including the first encapsulation portion and the second encapsulation portion.

[0034] Optionally, forming an encapsulation structure layer on the side of the light-emitting device layer away from the substrate further includes: forming a first inorganic encapsulation layer and a second inorganic encapsulation layer on the side of the light-emitting device layer away from the substrate, wherein the first inorganic encapsulation layer, the organic encapsulation layer, and the second inorganic encapsulation layer are stacked sequentially.

[0035] Optionally, the height of the first limiting part is in the range of [8μm, 13μm], and the height of the second limiting part is less than or equal to 3μm.

[0036] Optionally, both the first light-emitting unit and the second light-emitting unit are used to emit light of a first color, and the quantum dots in the second encapsulation part include quantum dots of a second color and quantum dots of a third color.

[0037] The quantum dots of the second color are used to emit light of the second color when excited by light of the first color;

[0038] The third-color quantum dot is used to emit the third-color light when excited by the first-color light.

[0039] Optionally, the second light-emitting unit is also used to emit light of the second color, and the quantum dot of the third color is also used to emit light of the third color when excited by the light of the second color.

[0040] Optionally, each of the first light-emitting unit and the second light-emitting unit includes a stacked first electrode, a light-emitting functional layer, and a second electrode;

[0041] Forming a light-emitting device layer on the substrate includes: forming a first electrode, a light-emitting functional layer, and a second electrode stacked on the substrate. The light-emitting functional layer includes one light-emitting layer or multiple light-emitting layers stacked on the substrate. The light-emitting layer in the first light-emitting unit and the light-emitting layer in the second light-emitting unit are both used to emit light of the first color.

[0042] Optionally, each of the first light-emitting unit and the second light-emitting unit includes a stacked first electrode, a light-emitting functional layer, and a second electrode;

[0043] Forming a light-emitting device layer on the substrate includes: forming a first electrode, a light-emitting functional layer, and a second electrode stacked on the substrate. The light-emitting functional layer in the first light-emitting unit includes one light-emitting layer or multiple stacked light-emitting layers. The light-emitting layers in the first light-emitting unit are all used to emit light of the first color. The light-emitting functional layer in the second light-emitting unit includes a stacked first light-emitting layer and a second light-emitting layer. The first light-emitting layer is used to emit light of the first color, and the second light-emitting layer is used to emit light of the second color.

[0044] Optionally, the first color is blue, the second color is green, and the third color is red.

[0045] Optionally, the method further includes forming a color filter layer on the side of the encapsulation structure layer away from the substrate.

[0046] Optionally, both the first light-emitting unit and the second light-emitting unit are OLED light-emitting units.

[0047] Optionally, the quantum dots include at least one of the following: Cd-based quantum dots, InP-based quantum dots, AlGs bulk quantum dots, or perovskite-based quantum dots.

[0048] Thirdly, a display device is provided, comprising a display substrate as provided in the first aspect or any alternative implementation thereof.

[0049] The beneficial effects of the technical solution provided in this application include:

[0050] The display substrate provided in this application includes a pixel defining layer comprising a first pixel opening, a second pixel opening, a first defining portion for defining the first pixel opening, and a second defining portion for defining the second pixel opening, wherein the height of the first defining portion is greater than the height of the second defining portion. The light-emitting device layer includes a first light-emitting unit and a second light-emitting unit, the first light-emitting unit being located in the first pixel opening and the second light-emitting unit being located in the second pixel opening. The encapsulation structure layer includes a first encapsulation portion corresponding to the first light-emitting unit and a second encapsulation portion corresponding to the second light-emitting unit. The first encapsulation portion includes scattering particles, and the second encapsulation portion includes quantum dots and scattering particles. The quantum dots in the second encapsulation portion are used to emit light under the excitation of light emitted by the second light-emitting unit, thus enabling light conversion. The encapsulation structure layer can encapsulate the light-emitting device layer on one hand, and on the other hand, serve as a color conversion pattern (CCP) to convert the light emitted by the light-emitting unit. Therefore, the optical path from the light-emitting device layer to the CCP (i.e., the encapsulation structure layer in this application) is short, and the light emitted from the light-emitting device layer reaches the CCP upon reaching the encapsulation structure layer. The light loss during the journey from the light-emitting device layer to the CCP is minimal, which helps improve the light extraction efficiency of the display substrate. Furthermore, since the encapsulation structure layer can act as a CCP to convert the light emitted by the light-emitting unit, there is no need to set up an additional CCP, which can save the process of manufacturing the CCP and simplify the manufacturing process of the display substrate. In addition, the first encapsulation part and the second encapsulation part also include scattering particles. The scattering particles in the first encapsulation part can scatter the light emitted by the first light-emitting unit, and the scattering particles in the second encapsulation part can scatter the light emitted by the second light-emitting unit and the light emitted by the quantum dots, thereby improving the uniformity of light output of the display substrate and avoiding color shift of the display substrate. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 is a front view of a display substrate provided in an embodiment of this application;

[0053] Figure 2 is a cross-sectional view of part AA of the display substrate shown in Figure 1;

[0054] Figure 3 is a schematic diagram of a light-emitting unit provided in an embodiment of this application;

[0055] Figure 4 is a schematic diagram of another light-emitting unit provided in an embodiment of this application;

[0056] Figure 5 is a schematic diagram of another light-emitting unit provided in an embodiment of this application;

[0057] Figure 6 is a cross-sectional view of another display substrate provided in an embodiment of this application;

[0058] Figure 7 is a cross-sectional view of another display substrate provided in an embodiment of this application;

[0059] Figure 8 is a flowchart of a method for manufacturing a display substrate according to an embodiment of this application;

[0060] Figures 9 to 17 are schematic diagrams illustrating the manufacturing process of a display substrate provided in an embodiment of this application.

[0061] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0062] To make the principles, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] Please refer to Figures 1 and 2. Figure 1 is a front view of a display substrate 100 provided in an embodiment of this application, and Figure 2 is a cross-sectional view of portion AA of the display substrate 100 shown in Figure 1. As shown in Figures 1 and 2, the display substrate 100 includes a substrate 11, a light-emitting device layer 12, a pixel definition layer (PDL) 13, and an encapsulation structure layer 14. The light-emitting device layer 12 and the pixel definition layer 13 are both located on the substrate 11, and the encapsulation structure layer 14 is located on the side of the light-emitting device layer 12 away from the substrate 11. The encapsulation structure layer 14 is used to encapsulate the light-emitting device layer 12 to prevent external moisture, oxygen, etc., from corroding the light-emitting device layer 12.

[0064] The light-emitting device layer 12 includes a first light-emitting unit 12B and a second light-emitting unit. The pixel defining layer 13 includes a first pixel opening, a second pixel opening, a first defining portion 131 for defining the first pixel opening, and a second defining portion 132 for defining the second pixel opening. The height of the first defining portion 131 is greater than the height of the second defining portion 132. The first light-emitting unit 12B is located in the first pixel opening, and the second light-emitting unit is located in the second pixel opening. The encapsulation structure layer 14 includes a first encapsulation portion 142B corresponding to the first light-emitting unit 12B and a second encapsulation portion corresponding to the second light-emitting unit. The first encapsulation portion 142B includes scattering particles 422, and the second encapsulation portion includes quantum dots 421 and scattering particles 422. In a specific embodiment, the light-emitting device layer 12 includes a plurality of first light-emitting units 12B (one first light-emitting unit 12B is shown in FIG. 2) and a plurality of second light-emitting units (two second light-emitting units are shown in FIG. 2, namely the second light-emitting unit 12G and the second light-emitting unit 12R); the pixel defining layer 13 includes a plurality of first pixel openings and a plurality of second pixel openings, wherein the plurality of first light-emitting units 12B are located one-to-one in the plurality of first pixel openings, and the plurality of second light-emitting units are located one-to-one in the plurality of second pixel openings. The encapsulation structure layer 14 includes a plurality of first encapsulation portions 142B corresponding one-to-one with the plurality of first light-emitting units 12B (one first encapsulation portion 142B corresponding to one first light-emitting unit 12B is shown in FIG2) and a plurality of second encapsulation portions corresponding one-to-one with the plurality of second light-emitting units (two second encapsulation portions are shown in FIG2, namely the second encapsulation portion 142G corresponding to the second light-emitting unit 12G and the second encapsulation portion 142R corresponding to the second light-emitting unit 12R). The first encapsulation portion 142B includes scattering particles 422, the second encapsulation portion 142G includes quantum dots 421 and scattering particles 422, and the second encapsulation portion 142R includes quantum dots 421 and scattering particles 422.

[0065] In an optional embodiment, the light-emitting device layer 12 includes a plurality of second light-emitting units 12R and a plurality of second light-emitting units 12G. Each of the plurality of second light-emitting units 12R is located one-to-one in a plurality of second pixel openings, and each of the plurality of second light-emitting units 12G is located one-to-one in a plurality of second pixel openings. The second light-emitting units 12R and 12G are located in different second pixel openings. The encapsulation structure layer 14 includes a plurality of second encapsulation portions 142G corresponding one-to-one with the plurality of second light-emitting units 12G, and a plurality of second encapsulation portions 142R corresponding one-to-one with the plurality of second light-emitting units 12R. Each second encapsulation portion 142G includes a quantum dot 421 and a scattering particle 422, and each second encapsulation portion 142R includes a quantum dot 421 and a scattering particle 422.

[0066] In this configuration, the orthographic projection of the first encapsulation portion 142B corresponding to any one of the first light-emitting units 12B onto the substrate 11 covers the first light-emitting unit 12B. The scattering particles 422 in the first encapsulation portion 142B corresponding to any one of the first light-emitting units 12B are used to scatter the light emitted by the first light-emitting unit 12B. Similarly, the orthographic projection of the second encapsulation portion 142G corresponding to any one of the second light-emitting units 12G onto the substrate 11 covers the second light-emitting unit 12G. The quantum dots 421 in the second encapsulation portion 142G corresponding to any one of the second light-emitting units 12G are used to emit light when excited by the light emitted by the second light-emitting unit 12G. The scattering particles 422 in the second encapsulation portion 142G corresponding to any one of the second light-emitting units 12G are used to scatter both the light emitted by the second light-emitting unit 12G and the light emitted by the quantum dots 421 in the second encapsulation portion 142G. The orthographic projection of the second encapsulation portion 142R corresponding to any one of the second light-emitting units 12R onto the substrate 11 covers the second light-emitting unit 12R. The quantum dot 421 in the second encapsulation portion 142R corresponding to any one of the second light-emitting units 12R is used to emit light under the excitation of the light emitted by the second light-emitting unit 12R. The scattering particle 422 in the second encapsulation portion 142R corresponding to any one of the second light-emitting units 12R is used to scatter the light emitted by the second light-emitting unit 12R and the light emitted by the quantum dot 421 in the second encapsulation portion 142R.

[0067] The height of the first limiting portion 131 is its dimension in the direction y perpendicular to the surface of the substrate 11. The height of the second limiting portion 132 is its dimension in the direction perpendicular to the surface of the substrate 11. The substrate is also called a substrate (SUB). In the embodiments of this application, the substrate 11 can be a rigid substrate made of a light-guiding and non-metallic transparent material with certain rigidity, such as glass or quartz. For example, the substrate 11 is a glass substrate. Alternatively, the substrate 11 can be a flexible substrate made of a flexible material such as polyimide (PI).

[0068] It should be noted that, typically, the first pixel opening and the second pixel opening can be adjacent, and adjacent first pixel openings and second pixel openings can share a limiting portion. Therefore, all or part of the first limiting portion used to limit the first pixel opening can also be used to limit the second pixel opening. For example, as shown in FIG2, the first limiting portion 131 located between the first light-emitting unit 12B and the second light-emitting unit 12G is used not only to limit the first pixel opening where the first light-emitting unit 12B is located, but also to limit the second pixel opening where the second light-emitting unit 12G is located. In the embodiments of this application, the limiting portion shared by the first pixel opening and the second pixel opening is the first limiting portion, and its height is greater than the height of the second limiting portion used only to limit the second pixel opening.

[0069] In summary, the display substrate provided in this application embodiment includes a light-emitting device layer comprising a first light-emitting unit and a second light-emitting unit, and an encapsulation structure layer comprising a first encapsulation portion corresponding to the first light-emitting unit and a second encapsulation portion corresponding to the second light-emitting unit. The quantum dots in the second encapsulation portion are used to emit light under the excitation of light emitted by the second light-emitting unit. Therefore, the second encapsulation portion can realize light conversion, such as light color conversion. The encapsulation structure layer can encapsulate the light-emitting device layer on one hand, and on the other hand, it can serve as a color conversion pattern (CCP) to convert the light emitted by the light-emitting unit. Thus, the optical path from the light-emitting device layer to the CCP (i.e., the encapsulation structure layer in this application embodiment) is short. The light emitted from the light-emitting device layer reaches the CCP as well as the encapsulation structure layer, resulting in less light loss during the process of reaching the CCP, which helps improve the light extraction efficiency of the display substrate. Furthermore, since the encapsulation structure layer can serve as a CCP to convert the light emitted by the light-emitting unit, there is no need to additionally set up a CCP, saving the process of manufacturing the CCP and simplifying the manufacturing process of the display substrate.

[0070] In addition, the first encapsulation part and the second encapsulation part also include scattering particles. The scattering particles in the first encapsulation part can scatter the light emitted by the first light-emitting unit, and the scattering particles in the second encapsulation part can scatter the light emitted by the second light-emitting unit and the light emitted by the quantum dots in the second encapsulation part, thereby improving the uniformity of light emission from the display substrate and avoiding color shift in the display substrate.

[0071] In an optional embodiment, as shown in FIG2, the first encapsulation portion 142B is located in the first pixel opening, and the second encapsulation portion (including the second encapsulation portion 142G and the second encapsulation portion 142R) is located in the second pixel opening. In a specific embodiment, each first encapsulation portion 142B and its corresponding first light-emitting unit 12B are located in the same first pixel opening, and each first encapsulation portion 142B is located on the side of the corresponding first light-emitting unit 12B away from the substrate 11. Each second encapsulation portion 142G and its corresponding second light-emitting unit 12G are located in the same second pixel opening, and each second encapsulation portion 142G is located on the side of the corresponding second light-emitting unit 12G away from the substrate 11. Each second encapsulation portion 142R and its corresponding second light-emitting unit 12R are located in the same second pixel opening, and each second encapsulation portion 142R is located on the side of the corresponding second light-emitting unit 12R away from the substrate 11.

[0072] In an optional embodiment, in the display substrate 100, a plurality of second packaging portions are an integral structure, and the first packaging portion 142B is independent of the second packaging portions. For example, all second packaging portions are an integral structure, all first packaging portions 142B are independent of the second packaging portions, and any two first packaging portions 142B are independent of each other. As shown in FIG2, the second packaging portion 142G and the second packaging portion 142R are an integral structure, the first packaging portion 142B and the second packaging portion 142G are independent of each other, and the first packaging portion 142B and the second packaging portion 142R are independent of each other. Since the plurality of second packaging portions are an integral structure, the plurality of second packaging portions can be manufactured in the same process, which simplifies the manufacturing process of the plurality of second packaging portions, reduces the manufacturing difficulty of the plurality of second packaging portions, and thus reduces the manufacturing difficulty of the display substrate 100.

[0073] In an optional embodiment, as shown in FIG2, the encapsulation structure layer 14 includes an organic encapsulation layer 142, which includes a first encapsulation portion 142B and a second encapsulation portion (including a second encapsulation portion 142G and a second encapsulation portion 142R). In a specific embodiment, the encapsulation structure layer 14 further includes a first inorganic encapsulation layer 141 and a second inorganic encapsulation layer 143, which are sequentially stacked along a direction away from the substrate 11. The thickness of the organic encapsulation layer 142 ranges from [8μm to 10μm]. The material of the organic encapsulation layer 142 is an organic material, including but not limited to organic resins. For example, the material of the first encapsulation portion 142B is a methyl methacrylate solution doped with scattering particles, and the material of the second encapsulation portion 142B is a methyl methacrylate solution doped with quantum dots and scattering particles. The first inorganic encapsulation layer 141 can be a single-layer structure (i.e., the first inorganic encapsulation layer 141 is a single inorganic layer) or a multi-layer structure (i.e., the first inorganic encapsulation layer 141 includes multiple stacked sub-inorganic layers). The material of the first inorganic encapsulation layer 141 is an inorganic material, including but not limited to one or a combination of silicon oxide (SiOx), silicon nitride (SiNx), or silicon oxynitride (SiOxNy). The refractive index of the first inorganic encapsulation layer 141 can be in the range of [1.45, 1.8]. The second inorganic encapsulation layer 143 can be a single-layer structure or a multi-layer structure. The material of the second inorganic encapsulation layer 143 is an inorganic material, including but not limited to one or a combination of SiOx, SiNx, or SiOxNy. The refractive index of the second inorganic encapsulation layer 143 can be [1.45, 1.8].

[0074] The encapsulation structure layer 14 can be a thin film encapsulation (TFE) structure layer. Figure 2 illustrates an example where the encapsulation structure layer includes two inorganic encapsulation layers and one organic encapsulation layer. In other embodiments, the encapsulation structure layer includes multiple inorganic encapsulation layers and multiple organic encapsulation layers, with the inorganic and organic encapsulation layers stacked alternately. For example, the encapsulation structure layer includes inorganic encapsulation layer 1, organic encapsulation layer 2, inorganic encapsulation layer 3, organic encapsulation layer 4, ..., inorganic encapsulation layer n stacked sequentially. In this case, at least one organic encapsulation layer includes the aforementioned first encapsulation portion and second encapsulation portion; this embodiment of the application does not limit this.

[0075] In an optional embodiment, the height of the first limiting portion 131 ranges from [8μm to 13μm], and the height of the second limiting portion 132 is less than or equal to 3μm. The heights of both the first limiting portion 131 and the second limiting portion 132 can be set according to actual conditions. For example, the height of the first limiting portion 131 can be 8μm, 9μm, 10μm, or 11μm, and the height of the second limiting portion 132 can be 3μm, 2.8μm, or 2.5μm. This height setting allows the first pixel opening and the second pixel opening to be isolated from each other, thereby facilitating the manufacture of independent first and second encapsulation portions, as well as facilitating the manufacture of multiple second encapsulation portions as a single integrated structure.

[0076] In an optional embodiment, both the first light-emitting unit 12B and the second light-emitting unit (including the second light-emitting unit 12G and the second light-emitting unit 12R) are used to emit light of a first color. The quantum dots 421 in the second encapsulation portion (including the second encapsulation portion 142G and the second encapsulation portion 142R) include quantum dots of a second color and quantum dots of a third color. The quantum dots of the second color are used to emit light of the second color when excited by the light of the first color, thereby converting the light of the first color into light of the second color. The quantum dots of the third color are used to emit light of the third color when excited by the light of the first color, thereby converting the light of the first color into light of the third color. After the light of the first color emitted by the second light-emitting unit enters the corresponding second encapsulation portion, the light of the first color excites the quantum dots of the second color in the second encapsulation portion to emit light of the second color, and the light of the first color excites the quantum dots of the third color in the second encapsulation portion to emit light of the third color.

[0077] In an optional embodiment, the second light-emitting unit (including the second light-emitting unit 12G and / or the second light-emitting unit 12R) is also used to emit light of a second color, that is, the second light-emitting unit (including the second light-emitting unit 12G and / or the second light-emitting unit 12R) is used to emit light of a first color and light of a second color. The quantum dots of a third color are also used to emit light of a third color under the excitation of the light of the second color, thereby converting the light of the second color into light of the third color. After the light of the second color emitted by the second light-emitting unit enters the corresponding second encapsulation portion, the light of the second color excites the quantum dots of the third color in the second encapsulation portion to emit light of the third color. In other embodiments, the first light-emitting unit 12B can also be used to emit light of the second color. That is, the first light-emitting unit 12B is used to emit light of the first color and light of the second color; this application embodiment does not limit this.

[0078] In the embodiments of this application, the first color, the second color, and the third color include blue, green, and red. For example, the first color is blue, the second color is green, and the third color is red.

[0079] It should be noted that quantum dots are nanoscale semiconductor materials with a core and a shell, which can emit light of a specific frequency when excited by light or electricity. The frequency of the light emitted by a quantum dot is related to the size of the quantum dot. Quantum dots are characterized by narrow emission spectra, wide tunable color range, and long fluorescence lifetime. In the embodiments of this application, "second-color quantum dot" means that the color of the light emitted by the quantum dot includes the second color, but does not mean that the quantum dot itself is the second color. The color of a second-color quantum dot may or may not be the second color. "Third-color quantum dot" means that the color of the light emitted by the quantum dot includes the third color, but does not mean that the quantum dot itself is the third color. The color of a third-color quantum dot may or may not be the third color. The embodiments of this application do not limit this. In optional embodiments, quantum dot 421 includes at least one of the following: group II-VI quantum dots, group IV-VI quantum dots, group III-V quantum dots, or group I-III-VI quantum dots. Among them, group II-VI quantum dots refer to quantum dots composed of group II elements and group VI elements. For example, cadmium (Cd)-based quantum dots are group II-VI quantum dots. Group IV-VI quantum dots refer to quantum dots composed of Group IV and Group VI elements. Group III-V quantum dots refer to quantum dots composed of Group III and Group V elements; for example, indium phosphide (InP) quantum dots are Group III-V quantum dots. Group I-III-VI quantum dots refer to quantum dots composed of Group I, Group III, and Group VI elements; for example, silver-indium-gallium-sulfur (Ag-In-Ga-S, AIGS) quantum dots are Group I-III-VI quantum dots. In an optional embodiment, quantum dot 421 can also be a perovskite quantum dot.

[0080] In an optional embodiment, as shown in FIG2, the display substrate 100 further includes a color filter layer 15, also referred to as a color filter (CF). The color filter layer 15 is located on the side of the encapsulation structure layer 14 away from the substrate 11. The color filter layer 15 is used to filter the light emitted by the light-emitting units (including the first light-emitting unit and the second light-emitting unit) and the light emitted by the quantum dots in the second encapsulation portion. In a specific embodiment, the color filter layer 15 includes a first filter portion 15B corresponding to the first light-emitting unit 12B, a second filter portion 15G corresponding to the third light-emitting unit 12G, and a third filter portion 15R corresponding to the second light-emitting unit 12R. The orthographic projection of the first filter portion 15B on the substrate 11 covers the first light-emitting unit 12B, the orthographic projection of the second filter portion 15G on the substrate 11 covers the second light-emitting unit 12G, and the orthographic projection of the third filter portion 15R on the substrate 11 covers the second light-emitting unit 12R. The first filter 15B allows light of the first color to pass through and blocks light of other colors other than the first color from passing through. The second filter 15G allows light of the second color to pass through and blocks light of other colors other than the second color from passing through. The third filter 15R allows light of the third color to pass through and blocks light of other colors other than the third color from passing through. Light emitted from the first light-emitting unit 12B (including light of the first color, and possibly light of the second color) enters the corresponding first encapsulation part 142B; the scattering particles 422 in the first encapsulation part 142B scatter the light entering the first encapsulation part 142B; the light emitted from the first encapsulation part 142B enters the corresponding first filter 15B; the first filter 15B filters the light entering the first filter 15B to allow light of the first color to pass through, thereby increasing the purity of the light of the first color emitted from the first filter 15B. The light emitted by the second light-emitting unit 12G (including light of the first color, and possibly light of the second color) enters the corresponding second encapsulation unit 142G; the light entering the second encapsulation unit 142G excites the quantum dots of the second color in the second encapsulation unit 142G to emit light of the second color, and excites the quantum dots of the third color in the second encapsulation unit 142G to emit light of the third color; the scattering particles 422 in the second encapsulation unit 142G scatter the light entering the second encapsulation unit 142G and the light emitted by the quantum dots 421 in the second encapsulation unit 142G; the light emitted from the second encapsulation unit 142G (the light emitted from the second encapsulation unit 142G is a mixture of light of the first color, light of the second color, and light of the third color) enters the corresponding second filter unit 15G; the second filter unit 15G filters the light entering the second filter unit 15G so that the light of the second color can pass through.The light emitted by the second light-emitting unit 12R (including light of the first color and possibly light of the second color) enters the corresponding second encapsulation part 142R; the light entering the second encapsulation part 142R excites the quantum dots of the second color in the second encapsulation part 142R to emit light of the second color, and excites the quantum dots of the third color in the second encapsulation part 142R to emit light of the third color; the scattering particles 422 in the second encapsulation part 142R scatter the light entering the second encapsulation part 142R and the light emitted by the quantum dots 421 in the second encapsulation part 142R; the light emitted from the second encapsulation part 142R (the light emitted from the second encapsulation part 142R is a mixture of light of the first color, light of the second color and light of the third color) enters the corresponding third filter part 15R; the third filter part 15R filters the light entering the third filter part 15R so that the light of the third color can pass through. Thus, light of a first color (e.g., blue) is emitted from the first filter 15B, light of a second color (e.g., green) is emitted from the second filter 15G, and light of a third color (e.g., red) is emitted from the third filter 15R, enabling the display substrate 100 to achieve full-color display. As shown in FIG1, the display substrate 100 includes a plurality of sub-pixels arranged in an array, including a first-color sub-pixel 10B, a second-color sub-pixel 10G, and a third-color sub-pixel 10R. The first-color sub-pixel 10B includes a first light-emitting unit 12B, a first encapsulation portion 142B corresponding to the first light-emitting unit 12B, and a first filter 15B corresponding to the first light-emitting unit 12B. The second-color sub-pixel 10G includes a second light-emitting unit 12G, a second encapsulation portion 142G corresponding to the second light-emitting unit 12G, and a second filter 15G corresponding to the second light-emitting unit 12G. The third-color sub-pixel 10R includes a second light-emitting unit 12R, a second encapsulation portion 142R corresponding to the second light-emitting unit 12R, and a third filter portion 15R corresponding to the second light-emitting unit 12R. Since light of the first color is emitted from the first filter portion 15B, light of the second color is emitted from the second filter portion 15G, and light of the third color is emitted from the third filter portion 15R, the display substrate 100 can realize that the first-color sub-pixel 10B displays the first color, the second-color sub-pixel 10G displays the second color, and the third-color sub-pixel 10R displays the third color. It should be noted that "first-color sub-pixel" means that the sub-pixel can display the first color, not that the color of the sub-pixel is the first color. "Second-color sub-pixel" means that the sub-pixel can display the second color, not that the color of the sub-pixel is the second color. "Third-color sub-pixel" means that the sub-pixel can display the third color, not that the color of the sub-pixel is the third color. This application embodiment does not limit this.

[0081] The color filter layer 15 can be made of a resin material with added dyes. For example, the first filter layer 15B is made of a resin material with added dye of a first color, the second filter layer 15G is made of a resin material with added dye of a second color, and the third filter layer 15R is made of a resin material with added dye of a third color. It should be noted that "first color dye" means that the dye allows light of the first color to pass through while blocking light of other colors (e.g., the dye does not absorb light of the first color but absorbs light of other colors), and does not mean that the dye is the first color. The color of the first color dye may or may not be the first color. Similarly, "second color dye" means that the dye allows light of the second color to pass through while blocking light of other colors (e.g., the dye does not absorb light of the second color but absorbs light of other colors), and does not mean that the dye is the second color. The color of the second color dye may or may not be the second color. "A dye of a third color" means that the dye allows light of a third color to pass through while blocking light of other colors (for example, the dye does not absorb light of a third color but absorbs light of other colors). It does not mean that the color of the dye is a third color. A dye of a third color may or may not be a third color. This application does not limit this.

[0082] In an optional embodiment, as shown in FIG2, the display substrate 100 further includes a black matrix (BM) pattern 16. The black matrix pattern 16 is located on the side of the encapsulation structure layer 14 away from the substrate 11. The black matrix pattern 16 includes a light-shielding portion 161 and a plurality of black matrix openings defined by the light-shielding portion 161. The color filter layer 15 includes a plurality of filter portions (e.g., a first filter portion 15B, a second filter portion 15G, and a third filter portion 15R), which are located one-to-one in the plurality of black matrix openings. The light-shielding portion 161 between any two black matrix openings is used to block the filter portions in the two black matrix openings to prevent crosstalk of light emitted from the filter portions in the two black matrix openings.

[0083] In an optional embodiment, as shown in FIG2, the display substrate 100 further includes a protective layer 17. The protective layer 17 is located on the side of the color filter layer 15 away from the substrate 11, and the protective layer 17 is used to protect the color filter layer 15. In some embodiments, the protective layer 17 may also be referred to as an over cover (OC) layer or a leveling layer.

[0084] In an optional embodiment, as shown in FIG2, each light-emitting unit in the first light-emitting unit 12B and the second light-emitting unit (including the second light-emitting unit 12G and the second light-emitting unit 12R) includes a stacked first electrode 121, a light-emitting functional layer 122, and a second electrode 123, with the light-emitting functional layer 122 located between the first electrode 121 and the second electrode 122. The first electrode 121 can be a block electrode, and the first electrodes 121 of different light-emitting units can be independent of each other. The second electrode 123 can be a plate electrode, and the second electrodes 123 of different light-emitting units can be an integral structure. That is, each light-emitting unit can have an independent first electrode 121, and different light-emitting units can share the second electrode 123. In some embodiments, the first electrode 121 is also referred to as an anode (AE) or a pixel electrode, and the second electrode 123 is also referred to as a cathode (CE) or a common electrode.

[0085] In this embodiment, the light-emitting functional layer 122 includes a single emission layer (EML) or multiple stacked emission layers. When the light-emitting functional layer 122 includes multiple stacked emission layers, these multiple emission layers are used to emit light of the same color. For example, all of the multiple emission layers are used to emit light of a first color. Alternatively, when the light-emitting functional layer 122 includes multiple stacked emission layers, these multiple emission layers are used to emit light of different colors. For example, some of the multiple emission layers are used to emit light of a first color, and other emission layers are used to emit light of a second color.

[0086] In one embodiment, both the first light-emitting unit 12B and the second light-emitting unit (including the second light-emitting unit 12G and the second light-emitting unit 12R) are used to emit light of a first color. For example, the first light-emitting unit 12B is used only to emit light of the first color, and the second light-emitting unit (including the second light-emitting unit 12G and the second light-emitting unit 12R) is used only to emit light of the first color. Each light-emitting unit in the first light-emitting unit 12B and the second light-emitting unit includes a stacked first electrode 121, a light-emitting functional layer 122, and a second electrode 123. The light-emitting functional layer 122 includes one light-emitting layer or multiple stacked light-emitting layers. The light-emitting layers in the first light-emitting unit 12B and the second light-emitting unit (including the second light-emitting unit 12G and the second light-emitting unit 12R) are used to emit light of the first color. In this embodiment, the first light-emitting unit 12B and the second light-emitting unit (including the second light-emitting unit 12G and the second light-emitting unit 12R) can share the light-emitting functional layer 122. Alternatively, the light-emitting functional layer 122 of the first light-emitting unit 12B and the light-emitting functional layer 122 of the second light-emitting unit may be independent of each other, and / or the light-emitting functional layers 122 of different second light-emitting units (e.g., the second light-emitting unit 12G and the second light-emitting unit 12R) may be independent of each other. When the light-emitting functional layer 122 of the first light-emitting unit 12B and the light-emitting functional layer 122 of the second light-emitting unit are independent of each other, the number of light-emitting layers included in the light-emitting functional layer 122 of the first light-emitting unit 12B may be equal to or unequal to the number of light-emitting layers included in the light-emitting functional layer 122 of the second light-emitting unit 12G. When the light-emitting functional layer 122 of the second light-emitting unit 12G and the light-emitting functional layer 122 of the second light-emitting unit 12R are independent of each other, the number of light-emitting layers included in the light-emitting functional layer 122 of the second light-emitting unit 12G may be equal to or unequal to the number of light-emitting layers included in the light-emitting functional layer 122 of the second light-emitting unit 12R.

[0087] In another embodiment, the first light-emitting unit 12B is used to emit light of a first color, and the second light-emitting unit (including the second light-emitting unit 12G and / or the second light-emitting unit 12R) is used to emit light of both the first and second colors. Each light-emitting unit in the first and second light-emitting units includes a stacked first electrode 121, a light-emitting functional layer 122, and a second electrode 123. The light-emitting functional layer 122 of the first light-emitting unit 12B includes one light-emitting layer or multiple stacked light-emitting layers, and all light-emitting layers in the first light-emitting unit 12B are used to emit light of the first color. The light-emitting functional layer 122 of the second light-emitting unit (including the second light-emitting unit 12G and / or the second light-emitting unit 12R) includes multiple light-emitting layers, some of which are used to emit light of the first color, and others are used to emit light of the second color. For example, the light-emitting functional layer 122 of the second light-emitting unit (including the second light-emitting unit 12G and / or the second light-emitting unit 12R) includes a stacked first light-emitting layer and a second light-emitting layer, the first light-emitting layer being used to emit light of the first color, and the second light-emitting layer being used to emit light of the second color. The number of first light-emitting layers can be one or more, and the number of second light-emitting layers can be one or more; this application does not limit this.

[0088] In an optional embodiment, the light-emitting functional layer 122 of both the second light-emitting unit 12G and the second light-emitting unit 12R includes multiple light-emitting layers. Some of these multiple light-emitting layers are used to emit light of a first color, while others are used to emit light of a second color. The second light-emitting unit 12G and the second light-emitting unit 12R may share the light-emitting functional layer 122. Alternatively, the light-emitting functional layer 122 of the second light-emitting unit 12G and the light-emitting functional layer 122 of the second light-emitting unit 12R may be independent of each other. When the light-emitting functional layers 122 of the second light-emitting unit 12G and the second light-emitting unit 12R are independent of each other, the number of light-emitting layers included in the light-emitting functional layer 122 of the second light-emitting unit 12G may be equal to or unequal to the number of light-emitting layers included in the light-emitting functional layer 122 of the second light-emitting unit 12R.

[0089] In optional embodiments, the color of the light emitted by the first light-emitting unit 12B is the same as the color of the light emitted by the second light-emitting unit (including the second light-emitting unit 12G and the second light-emitting unit 12R). For example, both the first light-emitting unit 12B and the second light-emitting unit are used to emit light of a first color, or both the first light-emitting unit 12B and the second light-emitting unit are used to emit light of a first color and light of a second color, and the first light-emitting unit 12B and the second light-emitting unit share the light-emitting functional layer 122. Figure 2 illustrates this using the example of the first light-emitting unit 12B and the second light-emitting unit sharing the light-emitting functional layer 122. In other embodiments, the light-emitting functional layer 122 of the first light-emitting unit 12B and the light-emitting functional layer 122 of the second light-emitting unit are independent of each other, and / or, the light-emitting functional layers 122 of different second light-emitting units are independent of each other. This application does not limit this aspect.

[0090] The structure of the light-emitting unit (first light-emitting unit or second light-emitting unit) of this application is described below.

[0091] In one embodiment, the light-emitting unit includes a stacked first electrode 121, a light-emitting functional layer 122, and a second electrode 123. The light-emitting functional layer 122 includes a light-emitting layer. Please refer to Figure 3, which shows a schematic diagram of a light-emitting unit 120 provided in an embodiment of this application. The light-emitting unit 120 can be any one of a first light-emitting unit 12B, a second light-emitting unit 12G, or a second light-emitting unit 12R. As shown in Figure 3, the light-emitting functional layer 122 is located between the first electrode 121 and the second electrode 122. The light-emitting functional layer 122 includes a stacked hole transport layer (HTL) 1221, a light-emitting layer 1222, and an electron transport layer (ETL) 1223. The first electrode 121, hole transport layer 1221, light-emitting layer 1222, electron transport layer 1223, and second electrode 122 are stacked sequentially. The light-emitting layer 1222 is used to emit light of a first color.

[0092] In another embodiment, the light-emitting unit includes a stacked first electrode 121, a light-emitting functional layer 122, and a second electrode 123. The light-emitting functional layer 122 includes two light-emitting layers. Please refer to Figure 4, which shows a schematic diagram of another light-emitting unit 120 provided in this application embodiment. The light-emitting unit 120 can be any one of the first light-emitting unit 12B, the second light-emitting unit 12G, or the second light-emitting unit 12R. As shown in Figure 4, the light-emitting functional layer 122 is located between the first electrode 121 and the second electrode 122. The light-emitting functional layer 122 includes a stacked hole transport layer 1221, a light-emitting layer 1222, a charge-generating layer (CGL) 1223, a light-emitting layer 1224, and an electron transport layer 1225. The first electrode 121, the hole transport layer 1221, the light-emitting layer 1222, the charge-generating layer 1223, the light-emitting layer 1224, the electron transport layer 1225, and the second electrode 122 are stacked sequentially. Both light-emitting layers 1222 and 1224 are used to emit light of a first color, or some of the light-emitting layers 1222 and 1224 are used to emit light of the first color, while others are used to emit light of a second color. For example, when the light-emitting unit 120 is a first light-emitting unit 12B, both light-emitting layers 1222 and 1224 are used to emit light of the first color. When the light-emitting unit 120 is a second light-emitting unit 12G or a second light-emitting unit 12R, both light-emitting layers 1222 and 1224 are used to emit light of the first color, or some of the light-emitting layers 1222 and 1224 are used to emit light of the first color, while others are used to emit light of the second color. In one example, the light-emitting unit 120 is the second light-emitting unit 12G or the second light-emitting unit 12R, the light-emitting layer 1222 is used to emit light of a first color, and the light-emitting layer 1224 is used to emit light of a second color. The light-emitting layer 1222 is the first light-emitting layer described above, and the light-emitting layer 1224 is the second light-emitting layer described above.

[0093] In another embodiment, the light-emitting unit includes a stacked first electrode 121, a light-emitting functional layer 122, and a second electrode 123. The light-emitting functional layer 122 includes three light-emitting layers. Please refer to FIG5, which shows a schematic diagram of another light-emitting unit 120 provided in an embodiment of this application. The light-emitting unit 120 can be any one of the first light-emitting unit 12B, the second light-emitting unit 12G, or the second light-emitting unit 12R. As shown in FIG5, the light-emitting functional layer 122 is located between the first electrode 121 and the second electrode 122. The light-emitting functional layer 122 includes a stacked hole transport layer 1221, a light-emitting layer 1222, a charge generating layer 1223, a light-emitting layer 1224, a charge generating layer 1225, a light-emitting layer 1226, and an electron transport layer 1227. A first electrode 121, a hole transport layer 1221, a light-emitting layer 1222, a charge-generating layer 1223, a light-emitting layer 1224, a charge-generating layer 1225, a light-emitting layer 1226, an electron transport layer 1227, and a second electrode 122 are stacked sequentially. Light-emitting layers 1222, 1224, and 1226 are all used to emit light of a first color; alternatively, some of the light-emitting layers 1222, 1224, and 1226 are used to emit light of the first color, while others are used to emit light of a second color. For example, when the light-emitting unit 120 is a first light-emitting unit 12B, all three light-emitting layers 1222, 1224, and 1226 are used to emit light of the first color. When the light-emitting unit 120 is a second light-emitting unit 12G or a second light-emitting unit 12R, light-emitting layers 1222, 1224, and 1226 are all used to emit light of a first color. Alternatively, some of the light-emitting layers 1222, 1224, and 1226 are used to emit light of the first color, while others are used to emit light of a second color. In one example, the light-emitting unit 120 is a second light-emitting unit 12G or a second light-emitting unit 12R, light-emitting layers 1222 and 1226 are used to emit light of the first color, light-emitting layer 1224 is used to emit light of the second color, light-emitting layers 1222 and 1226 are the aforementioned first light-emitting layers, and light-emitting layer 1224 is the aforementioned second light-emitting layer. In another example, the light-emitting unit 120 is the second light-emitting unit 12G or the second light-emitting unit 12R, the light-emitting layers 1222 and 1224 are used to emit light of a first color, and the light-emitting layer 1226 is used to emit light of a second color; the light-emitting layers 1222 and 1224 are the first light-emitting layers described above, and the light-emitting layer 1226 is the second light-emitting layer described above.In another example, the light-emitting unit 120 is the second light-emitting unit 12G or the second light-emitting unit 12R, the light-emitting layers 1224 and 1226 are used to emit light of a first color, and the light-emitting layer 1222 is used to emit light of a second color; the light-emitting layers 1224 and 1226 are the first light-emitting layers mentioned above, and the light-emitting layer 1222 is the second light-emitting layer mentioned above.

[0094] It is understood that the light-emitting units shown in Figures 3 to 5 are merely examples, and the light-emitting functional layer 122 may also include other functional film layers. For example, the light-emitting functional layer 122 may also include a hole injection layer (HTL) located between the first electrode 121 and the hole transport layer 1221, and an electron injection layer (EIL) located between the second electrode 122 and the electron transport layer 1223. The light-emitting functional layer 122 may also include three or more light-emitting layers, which is not limited in this embodiment.

[0095] In an optional embodiment, the display substrate 100 is a QD-OLED display substrate, the first light-emitting unit 12B and the second light-emitting unit (including the first light-emitting unit 12G and the second light-emitting unit 12R) are both OLED light-emitting units, and the material of the light-emitting layer in the light-emitting functional layer 122 is an organic light-emitting material.

[0096] In an optional embodiment, as shown in FIG2, the display substrate 100 further includes a circuit layer 18. The circuit layer 18 is located between the substrate 11 and the light-emitting device layer 12. The circuit layer 18 is used to drive the light-emitting units in the light-emitting device layer 12 to emit light. For example, the circuit layer 18 includes a switching unit 181 corresponding to each light-emitting unit, the switching unit 181 corresponding to each light-emitting unit being electrically connected to the light-emitting unit, and the switching unit 181 corresponding to each light-emitting unit being used to control the light-emitting unit to emit light or turn off. In a specific embodiment, the switching unit 181 corresponding to each light-emitting unit is electrically connected to the first electrode 121 in the light-emitting unit. The switching unit 181 may be a thin film transistor (TFT).

[0097] Figure 2 illustrates a configuration where the height of the first limiting portion 131 is greater than the height of the second limiting portion 132, multiple second encapsulation portions are integrated into a single structure, and the first encapsulation portion 142B and the second encapsulation portions are independent of each other. In some embodiments, the height of the first limiting portion 131 is equal to the height of the second limiting portion 132, multiple second encapsulation portions are integrated into a single structure, and the first encapsulation portion 142B and the second encapsulation portions are integrated into a single structure. In other embodiments, the height of the first limiting portion 131 is equal to the height of the second limiting portion 132, the first encapsulation portion 142B and the second encapsulation portions are independent of each other, any two first encapsulation portions are independent of each other, and any two second encapsulation portions are independent of each other.

[0098] Please refer to Figure 6, which shows a cross-sectional view of another display substrate 200 provided in an embodiment of this application. The front view of the display substrate 200 shown in Figure 6 is similar to that in Figure 1, and will not be described again here. Referring to Figure 6, unlike the display substrate 100 shown in Figure 2, in the display substrate 200 shown in Figure 6, the height of the first limiting portion 131 is equal to the height of the second limiting portion 132, and a plurality of second encapsulation portions (including second encapsulation portion 142G and second encapsulation portion 142R) are integrally structured, and the first encapsulation portion 142B is integrally structured with the second encapsulation portion. The first encapsulation portion 142B also includes quantum dots 421. That is, the first encapsulation portion 142B, the second encapsulation portion 142G, and the second encapsulation portion 142R are integrally structured, and each of the first encapsulation portion 142B, the second encapsulation portion 142G, and the second encapsulation portion 142R includes quantum dots 421 and scattering particles 422.

[0099] In an optional embodiment, in the display substrate 200 shown in FIG. 6, all defining portions in the pixel defining layer 13 have equal heights, and all encapsulation portions in the encapsulation structure layer 14 (specifically, all encapsulation portions in the organic encapsulation layer 142) are an integral structure, with each encapsulation portion including quantum dots 421 and scattering particles 422. For example, the height of all defining portions in the pixel defining layer 13 is less than or equal to 3 μm, and the height of all defining portions in the pixel defining layer 13 is equal.

[0100] In an optional embodiment, in the display substrate 200 shown in FIG. 6, the first light-emitting unit 12B and the second light-emitting unit (including the second light-emitting unit 12G and the second light-emitting unit 12R) are both used to emit light of a first color. The first light-emitting unit 12B and the second light-emitting unit can also be used to emit light of a second color. The quantum dots 421 in the first encapsulation portion 142B include quantum dots of the second color and quantum dots of the third color. The quantum dots 421 in the second encapsulation portion (including the second encapsulation portion 142G and the second encapsulation portion 142R) include quantum dots of the second color and quantum dots of the third color. After the light emitted by the first light-emitting unit 12B (including light of the first color and possibly light of the second color) enters the corresponding first encapsulation portion 142B, it excites the quantum dots of the second color in the first encapsulation portion 142B to emit light of the second color, and excites the quantum dots of the third color in the first encapsulation portion 142B to emit light of the third color. The light emitted by the second light-emitting unit (including light of the first color and possibly light of the second color) enters the corresponding second encapsulation part, thereby exciting the quantum dots of the second color in the second encapsulation part to emit light of the second color, and exciting the quantum dots of the third color in the second encapsulation part to emit light of the third color. In a specific embodiment, as shown in FIG6, the light emitted by the first light-emitting unit 12B (including light of the first color and possibly light of the second color) enters the corresponding first encapsulation part 142B; the light entering the first encapsulation part 142B excites the quantum dots of the second color in the first encapsulation part 142B to emit light of the second color, and excites the quantum dots of the third color in the first encapsulation part 142B to emit light of the third color; the scattering particles 422 in the first encapsulation part 142B scatter the light entering the first encapsulation part 142B and the light emitted by the quantum dots 421 in the first encapsulation part 142B; the light emitted from the first encapsulation part 142B (the light emitted from the first encapsulation part 142B is a mixture of light of the first color, light of the second color and light of the third color) enters the corresponding first filter part 15B; the first filter part 15B filters the light entering the first filter part 15B so that the light of the first color can pass through.The light emitted by the second light-emitting unit 12G (including light of the first color, and possibly light of the second color) enters the corresponding second encapsulation unit 142G; the light entering the second encapsulation unit 142G excites the quantum dots of the second color in the second encapsulation unit 142G to emit light of the second color, and excites the quantum dots of the third color in the second encapsulation unit 142G to emit light of the third color; the scattering particles 422 in the second encapsulation unit 142G scatter the light entering the second encapsulation unit 142G and the light emitted by the quantum dots 421 in the second encapsulation unit 142G; the light emitted from the second encapsulation unit 142G (the light emitted from the second encapsulation unit 142G is a mixture of light of the first color, light of the second color, and light of the third color) enters the corresponding second filter unit 15G; the second filter unit 15G filters the light entering the second filter unit 15G so that the light of the second color can pass through. The light emitted by the second light-emitting unit 12R (including light of the first color and possibly light of the second color) enters the corresponding second encapsulation part 142R; the light entering the second encapsulation part 142R excites the quantum dots of the second color in the second encapsulation part 142R to emit light of the second color, and excites the quantum dots of the third color in the second encapsulation part 142R to emit light of the third color; the scattering particles 422 in the second encapsulation part 142R scatter the light entering the second encapsulation part 142R and the light emitted by the quantum dots 421 in the second encapsulation part 142R; the light emitted from the second encapsulation part 142R (the light emitted from the second encapsulation part 142R is a mixture of light of the first color, light of the second color and light of the third color) enters the corresponding third filter part 15R; the third filter part 15R filters the light entering the third filter part 15R so that the light of the third color can pass through. Thus, light of a first color (e.g., blue) is emitted from the first filter 15B, light of a second color (e.g., green) is emitted from the second filter 15G, and light of a third color (e.g., red) is emitted from the third filter 15R, enabling the display substrate 200 to achieve full-color display. In a specific embodiment, the display substrate 200 includes a plurality of sub-pixels arranged in an array, including sub-pixels of the first color, sub-pixels of the second color, and sub-pixels of the third color. The sub-pixels of the first color include a first light-emitting unit 12B, a first encapsulation portion 142B corresponding to the first light-emitting unit 12B, and a first filter 15B corresponding to the first light-emitting unit 12B. The sub-pixels of the second color include a second light-emitting unit 12G, a second encapsulation portion 142G corresponding to the second light-emitting unit 12G, and a second filter 15G corresponding to the second light-emitting unit 12G. The sub-pixel of the third color includes a second light-emitting unit 12R, a second encapsulation portion 142R corresponding to the second light-emitting unit 12R, and a third filter portion 15R corresponding to the second light-emitting unit 12R.Since light of the first color is emitted from the first filter section 15B, light of the second color is emitted from the second filter section 15G, and light of the third color is emitted from the third filter section 15R, the display substrate 200 can realize that the sub-pixels of the first color display the first color, the sub-pixels of the second color display the second color, and the sub-pixels of the third color display the third color.

[0101] Please refer to Figure 7, which shows a cross-sectional view of another display substrate 300 provided in an embodiment of this application. The front view of the display substrate 300 shown in Figure 7 is similar to that in Figure 1, and will not be described again here. Referring to Figure 7, unlike the display substrate 100 shown in Figure 2, in the display substrate 300 shown in Figure 7, the height of the first limiting portion 131 is equal to the height of the second limiting portion 132, the second encapsulation portion 142G and the second encapsulation portion 142R are independent of each other, and the first encapsulation portion 142B and the second encapsulation portion are independent of each other. That is, the first encapsulation portion 142B, the second encapsulation portion 142G, and the second encapsulation portion 142R are independent of each other.

[0102] In an optional embodiment, in the display substrate 300 shown in FIG7, all the limiting portions in the pixel limiting layer 13 have the same height, and any two encapsulation portions in the encapsulation structure layer 14 (specifically any two encapsulation portions in the organic encapsulation layer 142) are independent of each other. For example, the height range of all the limiting portions in the pixel limiting layer 13 is [8μm, 13μm], and the height of all the limiting portions in the pixel limiting layer 13 is the same.

[0103] In an optional embodiment, in the display substrate 300 shown in FIG. 7, the first light-emitting unit 12B and the second light-emitting unit (including the second light-emitting unit 12G and the second light-emitting unit 12R) are both used to emit light of a first color. The first light-emitting unit 12B and the second light-emitting unit can also be used to emit light of a second color. The quantum dot 421 in the second encapsulation portion 142G is a quantum dot of the second color, and the quantum dot 421 in the second encapsulation portion 142R is a quantum dot of a third color. After the light emitted by the second light-emitting unit 12G (including light of the first color and possibly light of the second color) enters the corresponding second encapsulation portion 142G, it excites the quantum dot 421 in the second encapsulation portion 142G to emit light of the second color. After the light emitted by the second light-emitting unit 12R (including light of the first color and possibly light of the second color) enters the corresponding second encapsulation portion 142R, it excites the quantum dot 421 in the second encapsulation portion 142R to emit light of the third color. In a specific embodiment, as shown in FIG7, the light emitted by the first light-emitting unit 12B (including light of the first color and possibly light of the second color) enters the corresponding first encapsulation part 142B; the scattering particles 422 in the first encapsulation part 142B scatter the light entering the first encapsulation part 142B; the light emitted from the first encapsulation part 142B enters the corresponding first filter part 15B; the first filter part 15B filters the light entering the first filter part 15B to allow the light of the first color to pass through, thereby improving the purity of the light of the first color emitted from the first filter part 15B. The light emitted by the second light-emitting unit 12G (including light of the first color and possibly light of the second color) enters the corresponding second encapsulation part 142G; the light entering the second encapsulation part 142G excites the quantum dot 421 in the second encapsulation part 142G to emit light of the second color; the scattering particles 422 in the second encapsulation part 142G scatter the light entering the second encapsulation part 142G and the light emitted by the quantum dot 421 in the second encapsulation part 142G; the light emitted from the second encapsulation part 142G (the light emitted from the second encapsulation part 142G is a mixture of light of the first color and light of the second color) enters the corresponding second filter part 15G; the second filter part 15G filters the light entering the second filter part 15G so that the light of the second color can pass through.The light emitted by the second light-emitting unit 12R (including light of the first color, and possibly light of the second color) enters the corresponding second encapsulation part 142R; the light entering the second encapsulation part 142R excites the quantum dot 421 in the second encapsulation part 142R to emit light of the third color; the scattering particles 422 in the second encapsulation part 142R scatter the light entering the second encapsulation part 142R and the light emitted by the quantum dot 421 in the second encapsulation part 142R; the light emitted from the second encapsulation part 142R (including light of the first color and light of the third color, and possibly light of the second color) enters the corresponding third filter part 15R; the third filter part 15R filters the light entering the third filter part 15R so that the light of the third color can pass through. Thus, light of a first color (e.g., blue) is emitted from the first filter 15B, light of a second color (e.g., green) is emitted from the second filter 15G, and light of a third color (e.g., red) is emitted from the third filter 15R, enabling the display substrate 300 to achieve full-color display. In a specific embodiment, the display substrate 300 includes a plurality of sub-pixels arranged in an array, including sub-pixels of the first color, sub-pixels of the second color, and sub-pixels of the third color. The sub-pixels of the first color include a first light-emitting unit 12B, a first encapsulation portion 142B corresponding to the first light-emitting unit 12B, and a first filter 15B corresponding to the first light-emitting unit 12B. The sub-pixels of the second color include a second light-emitting unit 12G, a second encapsulation portion 142G corresponding to the second light-emitting unit 12G, and a second filter 15G corresponding to the second light-emitting unit 12G. The third color sub-pixel includes a second light-emitting unit 12R, a second encapsulation portion 142R corresponding to the second light-emitting unit 12R, and a third light-filtering portion 15R corresponding to the second light-emitting unit 12R. Since light of the first color is emitted from the first light-filtering portion 15B, light of the second color is emitted from the second light-filtering portion 15G, and light of the third color is emitted from the third light-filtering portion 15R, the display substrate 300 can realize that the first color sub-pixel displays the first color, the second color sub-pixel displays the second color, and the third color sub-pixel displays the third color.

[0104] It should be noted that in both display substrate 200 and display substrate 300, the first light-emitting unit 12B, the second light-emitting unit 12G, and the second light-emitting unit 12R share the light-emitting functional layer 122. Alternatively, the light-emitting functional layer 122 of the first light-emitting unit 12B is independent of the light-emitting functional layer 122 of the second light-emitting unit, and / or the light-emitting functional layer 122 of the second light-emitting unit 12G is independent of the light-emitting functional layer 122 of the second light-emitting unit 12R. Figures 6 and 7 illustrate this using the example of the first light-emitting unit 12B, the second light-emitting unit 12G, and the second light-emitting unit 12R sharing the light-emitting functional layer 122. For other descriptions of display substrate 200 and display substrate 300, please refer to the relevant description of display substrate 100, which will not be repeated here.

[0105] It should be noted that, since the first packaging section and the second packaging section are integrally integrated in the display substrate 200, and multiple second packaging sections are also integrally integrated, the first packaging section and the second packaging section can be manufactured in the same process. This simplifies the manufacturing process of the first packaging section and the second packaging section, reduces the manufacturing difficulty of the first packaging section and the second packaging section, and thus reduces the manufacturing difficulty of the display substrate 200. Since the first packaging section 142B does not contain quantum dots in the display substrates 100 and 300, it does not perform light conversion. Therefore, the first packaging section 142B consumes less light of the first color emitted by the first light-emitting unit 12B, resulting in more light of the first color emitted from the first packaging section 142B. Consequently, more light of the first color is emitted from the first filter section 142B, and the display substrates 100 and 300 have higher light extraction efficiency for the first color. Since the second encapsulation portion 142G in the display substrate 300 includes quantum dots of the second color but not quantum dots of the third color, the distribution density of the quantum dots of the second color in the second encapsulation portion 142G can be set to be large. This allows the quantum dots of the second color in the second encapsulation portion 142G to convert most of the light of the first color emitted by the second light-emitting unit 12G into light of the second color. As a result, the conversion efficiency of the second encapsulation portion 142G for the first color light emitted by the second light-emitting unit 12G is high, and more second color light is emitted from the second encapsulation portion 142G. Consequently, more second color light is emitted from the second filter portion 142G, and the light extraction efficiency of the display substrate 300 for the second color light is high. Since the second encapsulation portion 142R in the display substrate 300 includes quantum dots of a third color but not quantum dots of a second color, the distribution density of the quantum dots of the third color in the second encapsulation portion 142R can be set to be larger. This allows the quantum dots of the third color in the second encapsulation portion 142R to convert most of the light of the first color emitted by the second light-emitting unit 12R into light of the third color. As a result, the conversion efficiency of the second encapsulation portion 142R for the first color light emitted by the second light-emitting unit 12R is high, and more third color light is emitted from the second encapsulation portion 142R. Consequently, more third color light is emitted from the second filter portion 142R, and the light extraction efficiency of the display substrate 300 for the third color light is high.

[0106] The above is an introduction to the display substrate provided in the embodiments of this application. The following describes the manufacturing method of the display substrate provided in the embodiments of this application.

[0107] Please refer to Figure 8, which shows a flowchart of a method for manufacturing a display substrate according to an embodiment of this application. This manufacturing method can be used to manufacture the display substrate 100 shown in Figure 2. Referring to Figure 8, the manufacturing method includes the following steps S801 to S803.

[0108] S801. Provides a substrate.

[0109] The substrate can be a rigid substrate made of a light-guiding, non-metallic, transparent material with a certain degree of robustness, such as glass or quartz; for example, the substrate can be a glass substrate. Alternatively, the substrate can be a flexible substrate made of a flexible material such as PI. When the substrate is a flexible substrate, it can be provided as a rigid substrate (i.e., the substrate is provided by placing it on a rigid substrate).

[0110] S802. A light-emitting device layer and a pixel defining layer are formed on a substrate. The light-emitting device layer includes a first light-emitting unit and a second light-emitting unit. The pixel defining layer includes a first pixel opening, a second pixel opening, a first defining portion for defining the first pixel opening, and a second defining portion for defining the second pixel opening. The height of the first defining portion is greater than the height of the second defining portion. The first light-emitting unit is located in the first pixel opening, and the second light-emitting unit is located in the second pixel opening.

[0111] In a specific embodiment, the light-emitting device layer includes multiple light-emitting units, which include multiple first light-emitting units and multiple second light-emitting units. The pixel defining layer includes multiple pixel openings and defining portions for defining the multiple pixel openings. The multiple pixel openings include multiple first pixel openings and multiple second pixel openings. The defining portion for defining the first pixel openings is a first defining portion, and the defining portion for defining the second pixel openings is a second defining portion. The defining portion shared by the first pixel openings and the second pixel openings is the first defining portion, and the height of the first defining portion is greater than the height of the second defining portion. The multiple light-emitting units are located one-to-one in the multiple pixel openings, and the multiple first light-emitting units are located one-to-one in the multiple first pixel openings, and the multiple second light-emitting units are located one-to-one in the multiple second pixel openings.

[0112] Each of the plurality of light-emitting units (including a first light-emitting unit and a second light-emitting unit) includes a stacked first electrode, a light-emitting functional layer, and a second electrode. Therefore, forming a light-emitting device layer on a substrate includes forming a stacked first electrode, a light-emitting functional layer, and a second electrode on the substrate. The first electrodes of different light-emitting units among the plurality of light-emitting units can be independent of each other. Different light-emitting units among the plurality of light-emitting units can share a second electrode. The light-emitting functional layers of the first light-emitting unit and the second light-emitting unit can be independent of each other, and / or, the light-emitting functional layers of different second light-emitting units can be independent of each other. Alternatively, the first light-emitting unit and the second light-emitting unit share a light-emitting functional layer, and different second light-emitting units share a common light-emitting functional layer. For example, the plurality of light-emitting units share a common light-emitting functional layer.

[0113] This application embodiment uses the example of multiple light-emitting units sharing a light-emitting functional layer and a second electrode, and the first electrodes of different light-emitting units among the multiple light-emitting units being independent of each other.

[0114] Please refer to Figure 9, which shows a schematic diagram of a plurality of first electrodes 121 formed on a substrate 11 according to an embodiment of this application. The material of the first electrodes 121 can be a metallic material, including but not limited to Mo (molybdenum), Cu (copper), Al (aluminum), and their alloys.

[0115] In an optional embodiment, a metal material layer is deposited on the substrate 11 to obtain a metal material layer, and the metal material layer is processed by a single patterning process to obtain the first electrode 121. The metal material deposition process includes, but is not limited to, magnetron sputtering, thermal evaporation, or plasma-enhanced chemical vapor deposition (PECVD).

[0116] After forming the first electrode 121 on the substrate 11, referring to FIG. 10, a pixel defining layer 13 is formed on the substrate 11. The pixel defining layer 13 includes a plurality of pixel openings and defining portions for defining the plurality of pixel openings, with the plurality of first electrodes 121 corresponding to each of the plurality of pixel openings. The plurality of pixel openings includes a first pixel opening K1 and a second pixel opening K2, and the defining portions for defining the plurality of pixel openings include a first defining portion 131 and a second defining portion 132. The first defining portion 131 is used to define the first pixel opening K1, and the second defining portion 132 is used to define the first pixel opening K2. The height of the first defining portion 131 is greater than the height of the second defining portion 132. Adjacent first pixel openings K1 and K2 share a defining portion, and the defining portion shared by the first pixel openings K1 and K2 is the first defining portion 131.

[0117] The pixel defining layer 13 may be made of organic materials such as organic resins, or it may be made of inorganic materials such as SiOx, SiNx, alumina (Al2O3), or SiOxNy. In this embodiment, the pixel defining layer 13 can be formed through two patterning processes or through a single patterning process. The example using SiOx as the material for the pixel defining layer 13 will be described below.

[0118] In one embodiment, the pixel defining layer 13 is formed through two patterning processes. One patterning process is used to form the second defining portion 132, and the other patterning process is used to form the first defining portion 131. Specifically, in this embodiment, firstly, a SiOx layer is deposited on a substrate 11 on which the first electrode 121 is formed to obtain a first SiOx material layer. The first SiOx material layer is then processed through a single patterning process to obtain the second defining portion 132. Then, a SiOx layer is deposited on the substrate 11 on which the first electrode 121 and the second defining portion 132 are formed to obtain a second SiOx material layer. The second SiOx material layer is then processed through a single patterning process to obtain the first defining portion 131. In this embodiment, the thickness of the first SiOx material layer is less than or equal to 3 μm, and the thickness of the second SiOx material layer ranges from [8 μm to 13 μm], thereby making the height of the second defining portion 132 less than or equal to 3 μm, and the height of the first defining portion 131 range from [8 μm to 13 μm]. Here, we take the example of forming the second limiting part 132 first and then the first limiting part 131. In other embodiments, the first limiting part 131 is formed first and then the second limiting part 132 is formed. The embodiments of this application do not limit the order in which the first limiting part 131 and the second limiting part 132 are formed.

[0119] In another embodiment, the pixel defining layer 13 is formed through two patterning processes. One patterning process forms the second defining portion 132 and an initial defining portion defining the first pixel opening, while the other patterning process increases the height of the initial defining portion to obtain the first defining portion 131. Specifically, in a specific embodiment, firstly, a SiOx layer is deposited on the substrate 11 where the first electrode 121 is formed to obtain a first SiOx material layer. The first SiOx material layer is then processed through a single patterning process to obtain the second defining portion 132 and the initial defining portion defining the first pixel opening. The height of the initial defining portion is equal to the height of the second defining portion 132. Then, a SiOx layer is deposited on the substrate 11 on which the first electrode 121, the second limiting portion 132, and the initial limiting portion are formed to obtain a second SiOx material layer. The second SiOx material layer is processed by a patterning process to retain the portion of the second SiOx material layer located on the initial limiting portion and remove the portion of the second SiOx material layer located outside the initial limiting portion, thereby increasing the height of the initial limiting portion. The increased initial limiting portion is the first limiting portion 131. In this embodiment, the thickness of the first SiOx material layer is less than or equal to 3 μm, and the thickness of the second SiOx material layer is in the range of [5 μm, 10 μm]. This makes the height of both the second limiting portion 132 and the initial limiting portion less than or equal to 3 μm, and the height of the increased initial limiting portion (i.e., the first limiting portion 131) is in the range of [8 μm, 13 μm].

[0120] In another embodiment, the pixel defining layer 13 is formed through a single patterning process. In this single patterning process, the exposure mask is a grayscale mask, which includes a fully transparent region corresponding to the pixel opening (including the first pixel opening and the second pixel opening), a partially transparent region corresponding to the second defining portion 132, and a light-shielding region corresponding to the first defining portion 131. In a specific embodiment, a SiOx material layer is deposited on the substrate 11 on which the first electrode 121 is formed to obtain a SiOx material layer. A photoresist layer is coated on the SiOx material layer to obtain a photoresist layer. The photoresist layer is exposed using the grayscale mask, so that the photoresist layer forms a fully exposed region, a partially exposed region, and an unexposed region. The fully exposed region corresponds to the fully transparent region of the grayscale mask, the partially exposed region corresponds to the partially transparent region of the grayscale mask, and the unexposed region corresponds to the light-shielding region of the grayscale mask. The exposed photoresist layer is developed to obtain a photoresist pattern, which includes a first photoresist region, a second photoresist region, and a photoresist completely removed region. The first photoresist region is the non-exposed region, the second photoresist region corresponds to the partially exposed region, and the thickness of the second photoresist region is less than that of the first photoresist region. The photoresist completely removed region corresponds to the fully exposed region. The corresponding area of ​​the photoresist completely removed region on the SiOx material layer is etched to form a pixel opening on the SiOx material layer. After forming the pixel opening on the SiOx material layer, an ashing process is used to process the photoresist pattern to remove the photoresist in the second photoresist region. Then, the corresponding area of ​​the second photoresist region on the SiOx material layer is partially etched to obtain a second limiting portion 132. Finally, the photoresist in the first photoresist region is removed to obtain a first limiting portion 131. In this embodiment, the thickness of the SiOx material layer is in the range of [8μm, 13μm]. The corresponding area of ​​the second photoresist region on the SiOx material layer is partially etched to reduce the thickness of the region to less than or equal to 3μm. As a result, the height of the second limiting part 132 is less than or equal to 3μm, and the height of the first limiting part 131 is in the range of [8μm, 13μm].

[0121] After forming the pixel defining layer 13, referring to FIG11, a light-emitting functional layer 122 is formed on the substrate 11 on which the pixel defining layer 13 is formed. A portion of the light-emitting functional layer 122 is located in the pixel opening, and the light-emitting functional layer 122 located in each pixel opening is stacked with the first electrode 121 in the pixel opening.

[0122] In one embodiment, as shown in FIG3, the light-emitting functional layer 122 includes a stacked hole transport layer 1221, a light-emitting layer 1222, and an electron transport layer 1223. Forming the light-emitting functional layer 122 on a substrate 11 having a first electrode 121 and a pixel defining layer 13 includes sequentially forming the hole transport layer 1221, the light-emitting layer 1222, and the electron transport layer 1223 on the substrate 11 having the first electrode 121 and the pixel defining layer 13.

[0123] In another embodiment, as shown in FIG4, the light-emitting functional layer 122 includes a stacked hole transport layer 1221, a light-emitting layer 1222, a charge-generating layer 1223, a light-emitting layer 1224, and an electron transport layer 1225. Forming the light-emitting functional layer 122 on a substrate 11 having a first electrode 121 and a pixel defining layer 13 includes sequentially forming the hole transport layer 1221, the light-emitting layer 1222, the charge-generating layer 1223, the light-emitting layer 1224, and the electron transport layer 1225 on the substrate 11 having the first electrode 121 and the pixel defining layer 13.

[0124] In another embodiment, as shown in FIG5, the light-emitting functional layer 122 includes a stacked hole transport layer 1221, a light-emitting layer 1222, a charge-generating layer 1223, a light-emitting layer 1224, a charge-generating layer 1225, a light-emitting layer 1226, and an electron transport layer 1227. Forming the light-emitting functional layer 122 on a substrate 11 having a first electrode 121 and a pixel defining layer 13 includes: sequentially forming the hole transport layer 1221, the light-emitting layer 1222, the charge-generating layer 1223, the light-emitting layer 1224, the charge-generating layer 1225, the light-emitting layer 1226, and the electron transport layer 1227 on the substrate 11 having the first electrode 121 and the pixel defining layer 13.

[0125] In the embodiments of this application, the light-emitting functional layer 122 can be formed by vapor deposition process.

[0126] This application illustrates an example of multiple light-emitting units sharing a common light-emitting functional layer 122. In other embodiments, the light-emitting functional layers 122 of different light-emitting units are independent of each other, and at least two light-emitting units have different light-emitting functional layers 122. In this case, light-emitting functional layers 122 with identical structures can be fabricated simultaneously, and this application does not limit this.

[0127] After forming the light-emitting functional layer 122, referring to FIG12, a second electrode 123 is formed on the side of the light-emitting functional layer 122 away from the substrate 11, and the second electrode 123 is stacked with the light-emitting functional layer 122. The first electrode 121, the light-emitting functional layer 122 and the second electrode 123 located in each pixel opening are stacked sequentially to form a light-emitting unit. For example, the first electrode 121, the light-emitting functional layer 122 and the second electrode 123 located in the first pixel opening K1 are stacked sequentially to form a first light-emitting unit 12B, and the first electrode 121, the light-emitting functional layer 122 and the second electrode 123 located in each second pixel opening K2 are stacked sequentially to form a second light-emitting unit.

[0128] The second electrode 123 is made of a transparent conductive material, including but not limited to indium tin oxide (ITO), indium zinc oxide (IZO), or aluminum-doped zinc oxide (ZnO:Al). Taking ITO as an example, an ITO layer is deposited on the side of the light-emitting functional layer 122 away from the substrate 11 as the second electrode 123. The ITO deposition process includes, but is not limited to, magnetron sputtering, thermal evaporation, or PECVD.

[0129] This application uses the example of multiple light-emitting units sharing a second electrode 123. In other embodiments, the second electrodes 123 of different light-emitting units among the multiple light-emitting units are independent of each other. In this case, the deposited ITO can be processed by a single patterning process to obtain multiple second electrodes 123.

[0130] In an optional embodiment, as shown in Figures 9 to 12, a circuit layer 18 is provided between the substrate 11 and the light-emitting device layer 12. Before the light-emitting device layer 12 and the pixel defining layer 13 are formed on the substrate 11 (i.e., before S802), the circuit layer 18 is formed on the substrate 11. The circuit layer 18 includes a switching unit 181 corresponding to each light-emitting unit in the light-emitting device layer 12, and the switching unit 181 corresponding to each light-emitting unit is electrically connected to that light-emitting unit. Specifically, after the light-emitting device layer 12 is formed on the substrate 11, the first electrode 121 in each light-emitting unit is electrically connected to the switching unit 181 corresponding to that light-emitting unit.

[0131] S803. An encapsulation structure layer is formed on the side of the light-emitting device layer away from the substrate. The encapsulation structure layer includes a first encapsulation part corresponding to the first light-emitting unit and a second encapsulation part corresponding to the second light-emitting unit. The first encapsulation part includes scattering particles, and the second encapsulation part includes quantum dots and scattering particles.

[0132] In a specific embodiment, the light-emitting device layer includes a plurality of first light-emitting units and a plurality of second light-emitting units. The pixel defining layer includes a plurality of first pixel openings and a plurality of second pixel openings. Each of the plurality of first light-emitting units and the plurality of second light-emitting units is located one-to-one within the plurality of first pixel openings. The encapsulation structure layer includes a plurality of first encapsulation portions corresponding one-to-one with the plurality of first light-emitting units and a plurality of second encapsulation portions corresponding one-to-one with the plurality of second light-emitting units. Each of the plurality of first encapsulation portions and the plurality of second encapsulation portions are located one-to-one within the plurality of first pixel openings. In each first pixel opening, a first encapsulation portion is stacked with a first light-emitting unit. In each second pixel opening, a second encapsulation portion is stacked with a second light-emitting unit. Each first encapsulation portion includes scattering particles, and each second encapsulation portion includes quantum dots and scattering particles.

[0133] In an optional embodiment, the plurality of second packaging parts are an integral structure, and the first packaging part and the second packaging part can be independent of each other, and any two of the plurality of first packaging parts are independent of each other.

[0134] In this embodiment, both the first and second light-emitting units emit light of a first color. The quantum dots in the second encapsulation portion include quantum dots of a second color and quantum dots of a third color. The quantum dots of the second color emit light of the second color when excited by light of the first color. The quantum dots of the third color emit light of the third color when excited by light of the first color. In an optional embodiment, the second light-emitting unit is further used to emit light of the second color, and the quantum dots of the third color are further used to emit light of the third color when excited by light of the second color. The first light-emitting unit is also used to emit light of the second color.

[0135] In an optional embodiment, the encapsulation structure layer includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked sequentially, wherein the organic encapsulation layer includes a first encapsulation portion and a second encapsulation portion. Forming the encapsulation structure layer on the side of the light-emitting device layer away from the substrate includes: forming a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked sequentially on the side of the light-emitting device layer away from the substrate.

[0136] Please refer to Figure 13, which shows a schematic diagram of a first inorganic encapsulation layer 141 formed on the side of the light-emitting device layer 12 away from the substrate 11, according to an embodiment of this application. The orthographic projection of the first inorganic encapsulation layer 141 on the substrate 11 covers the orthographic projection of the light-emitting device layer 12 on the substrate 11.

[0137] The first inorganic encapsulation layer 141 is made of an inorganic material, including but not limited to one or a combination of SiOx, SiNx, or SiOxNy. Taking SiOx as an example, the material of the first inorganic encapsulation layer 141 is SiOx. A layer of SiOx is deposited on the side of the light-emitting device layer 12 away from the substrate 11 as the first inorganic encapsulation layer 141. The process for depositing SiOx includes, but is not limited to, magnetron sputtering, thermal evaporation, or PECVD.

[0138] After forming the first inorganic encapsulation layer 141 on the side of the light-emitting device layer 12 away from the substrate 11, referring to FIG14, an organic encapsulation layer 142 is formed on the side of the first inorganic encapsulation layer 141 away from the substrate 11. The organic encapsulation layer 142 is stacked with the first inorganic encapsulation layer 141, and the organic encapsulation layer 142 includes a first encapsulation portion 142B and a second encapsulation portion (including a second encapsulation portion 142G and a second encapsulation portion 142R). The first encapsulation portion 142B is located in a first pixel opening, and each second encapsulation portion is located in a second pixel opening. The second encapsulation portion 142G and the second encapsulation portion 142R are integral structures. The first encapsulation portion 142B includes scattering particles 422, and both the second encapsulation portion 142G and the second encapsulation portion 142R include quantum dots 421 and scattering particles 422. Furthermore, the quantum dots 421 include quantum dots of a second color and quantum dots of a third color.

[0139] The organic encapsulation layer 142 is made of organic materials, including but not limited to organic resins. For example, the first encapsulation portion 142B is made of a methyl methacrylate solution doped with scattering particles, and the second encapsulation portion 142B is made of a methyl methacrylate solution doped with quantum dots and scattering particles. The organic encapsulation layer 142 can be formed on the side of the first inorganic encapsulation layer 141 away from the substrate 11 using an inkjet printing process.

[0140] In a specific embodiment, an organic encapsulation layer 142 is formed on the side of the first inorganic encapsulation layer 141 away from the substrate 11. This includes: printing a methyl methacrylate solution doped with scattering particles 422 into the first pixel opening, and curing the printed methyl methacrylate solution to form a first encapsulation portion 142B in the first pixel opening. A methyl methacrylate solution doped with quantum dots 421 of a second color, quantum dots 421 of a third color, and scattering particles is printed into the second pixel opening, and the printed methyl methacrylate solution is cured to form a second encapsulation portion in the second pixel opening.

[0141] After forming the organic encapsulation layer 142 on the side of the first inorganic encapsulation layer 141 away from the substrate 11, referring to FIG15, a second inorganic encapsulation layer 143 is formed on the side of the organic encapsulation layer 142 away from the substrate 11. The second inorganic encapsulation layer 143 is stacked with the organic encapsulation layer 142, and the orthographic projection of the second inorganic encapsulation layer 143 on the substrate 11 covers the orthographic projection of the organic encapsulation layer 142 on the substrate 11.

[0142] The material of the second inorganic encapsulation layer 143 is an inorganic material, including but not limited to one or a combination of SiOx, SiNx, or SiOxNy. Taking SiOx as an example, the material of the second inorganic encapsulation layer 143 is described. A layer of SiOx is deposited on the side of the organic encapsulation layer 142 away from the substrate 11 as the second inorganic encapsulation layer 143. The process for depositing SiOx includes, but is not limited to, magnetron sputtering, thermal evaporation, or PECVD.

[0143] This application embodiment uses an encapsulation structure layer 14 comprising two inorganic encapsulation layers and one organic encapsulation layer as an example. In other embodiments, the encapsulation structure layer comprises multiple inorganic encapsulation layers and multiple organic encapsulation layers, with the inorganic and organic encapsulation layers alternately stacked. Correspondingly, an encapsulation structure layer is formed on the side of the light-emitting device layer away from the substrate, including: forming alternately stacked inorganic and organic encapsulation layers on the side of the light-emitting device layer away from the substrate. For example, an inorganic encapsulation layer 1, an organic encapsulation layer 2, an inorganic encapsulation layer 3, an organic encapsulation layer 4, ..., an inorganic encapsulation layer n are formed sequentially on the side of the light-emitting device layer away from the substrate. In this case, at least one organic encapsulation layer includes a first encapsulation portion and a second encapsulation portion.

[0144] In an optional embodiment, after forming the encapsulation structure layer 14 on the side of the light-emitting device layer 12 away from the substrate 11, referring to FIG16, a black matrix pattern 16 is formed on the side of the encapsulation structure layer 14 away from the substrate 11. The black matrix pattern 16 includes a light-shielding portion 161 and a plurality of black matrix openings defined by the light-shielding portion 161. The plurality of black matrix openings correspond one-to-one with a plurality of light-emitting units in the light-emitting device layer 12, and the orthographic projection of each light-emitting unit on the substrate 11 lies within the orthographic projection of the corresponding black matrix opening on the substrate 11.

[0145] After forming the black matrix pattern 16 on the side of the encapsulation structure layer 14 away from the substrate 11, referring to FIG17, a color filter layer 15 is formed on the side of the encapsulation structure layer 14 away from the substrate 11. The color filter layer 15 includes multiple filter portions (e.g., a first filter portion 15B, a second filter portion 15G, and a third filter portion 15R), which are located one-to-one in the multiple black matrix openings of the black matrix pattern 16. A light-shielding portion 161 between any two black matrix openings is used to block the filter portions in those two black matrix openings, preventing crosstalk of light emitted from the filter portions in those two black matrix openings.

[0146] In an optional embodiment, after forming the color filter layer 15 on the side of the encapsulation structure layer 14 away from the substrate 11, a protective layer 17 is formed on the side of the color filter layer 15 away from the substrate 11. A schematic diagram of the protective layer 17 formed on the side of the color filter layer 15 away from the substrate 11 is shown in FIG2. The protective layer 17 is used to protect the color filter layer 15. The protective layer 17 may also be referred to as an OC layer or a leveling layer.

[0147] In summary, the display substrate manufactured by the manufacturing method provided in this application includes a light-emitting device layer comprising a first light-emitting unit and a second light-emitting unit, and an encapsulation structure layer comprising a first encapsulation portion corresponding to the first light-emitting unit and a second encapsulation portion corresponding to the second light-emitting unit. The quantum dots in the second encapsulation portion are used to emit light under the excitation of light emitted by the second light-emitting unit. Therefore, the second encapsulation portion can realize light conversion, such as light color conversion. The encapsulation structure layer can encapsulate the light-emitting device layer on one hand, and on the other hand, act as a CCP to convert the light emitted by the light-emitting unit on the other. Thus, the optical path from the light-emitting device layer to the CCP (i.e., the encapsulation structure layer in this application embodiment) is short, and the light emitted from the light-emitting device layer reaches the CCP as well as the encapsulation structure layer. The light loss during the process of reaching the CCP is minimal, which helps to improve the light extraction efficiency of the display substrate. Furthermore, since the encapsulation structure layer can act as a CCP to convert the light emitted by the light-emitting unit, there is no need to additionally set up a CCP, saving the process of manufacturing the CCP and simplifying the manufacturing process of the display substrate.

[0148] In addition, the first encapsulation part and the second encapsulation part also include scattering particles. The scattering particles in the first encapsulation part can scatter the light emitted by the first light-emitting unit, and the scattering particles in the second encapsulation part can scatter the light emitted by the second light-emitting unit and the light emitted by the quantum dots in the second encapsulation part, thereby improving the uniformity of light emission from the display substrate and avoiding color shift in the display substrate.

[0149] The embodiment shown in Figure 8 uses the manufacturing of the display substrate 100 shown in Figure 2 as an example. The manufacturing methods of the display substrate 200 shown in Figure 6 and the display substrate 300 shown in Figure 7 can both refer to the embodiment shown in Figure 8. It should be noted that, unlike the manufacturing method of the display substrate 100, in the manufacturing method of the display substrate 200, the pixel defining layer 13 is formed by a single patterning process, and during the formation of the organic encapsulation layer 142, a methyl methacrylate solution doped with quantum dots 421 of the second color, quantum dots 421 of the third color, and scattering particles 422 is printed in both the first pixel opening and the second pixel opening. Unlike the manufacturing method of the display substrate 100, in the manufacturing method of the display substrate 300, the pixel defining layer 13 is formed by a single patterning process. In the process of forming the organic encapsulation layer 142, a methyl methacrylate solution doped with scattering particles 422 is printed in the first pixel opening, a methyl methacrylate solution doped with scattering particles 422 and quantum dots 421 of the second color is printed in the second pixel opening where the second light-emitting unit 12G is located, and a methyl methacrylate solution doped with scattering particles 422 and quantum dots 421 of the third color is printed in the second pixel opening where the second light-emitting unit 12R is located.

[0150] The remaining manufacturing processes of the display substrate 200 and the display substrate 300 can be referred to the embodiment shown in FIG8, and will not be described in detail here.

[0151] In the manufacturing method of the display substrate provided in this application embodiment, the primary patterning process may include photoresist coating, exposure, development, etching, and photoresist stripping. Processing the material layer (e.g., a metal material layer) through the primary patterning process may include: coating a layer of photoresist on the material layer (e.g., a metal material layer) to obtain a photoresist layer; exposing the photoresist layer using a mask to form fully exposed and unexposed areas; then using a development process to completely remove the photoresist in the fully exposed areas while retaining all the photoresist in the unexposed areas; using an etching process to etch the areas on the material layer (e.g., the metal material layer) corresponding to the fully exposed areas; and finally stripping the photoresist in the unexposed areas to obtain the corresponding structure (e.g., the first electrode 121). It is easy to understand that this explanation uses a positive photoresist as an example. When the photoresist is a negative photoresist, the primary patterning process can be referred to the description in this paragraph, and will not be repeated here.

[0152] Based on the same inventive concept, this application provides a display device, which includes the display substrate 100, display substrate 200, or display substrate 300 provided in the above embodiments. The display device can be any product or component with display function, such as a display screen, electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, or wearable device.

[0153] In this application, the term "at least one" refers to one or more items, and "multiple" refers to two or more items. Furthermore, for clarity, the terms "first," "second," and "third" are used to distinguish identical or similar items with substantially the same function or effect. Those skilled in the art will understand that the terms "first," "second," and "third" do not limit the quantity or order of execution.

[0154] The embodiments of the display substrate and the embodiment of the manufacturing method of the display substrate provided in this application can be referred to each other, and this application does not limit them. The order of operations in the method embodiments provided in this application can be appropriately adjusted, and operations can be added or removed according to the situation. Any variations that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application, and therefore will not be described in detail.

[0155] The above description is merely an exemplary embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent modifications or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display substrate, characterized in that, include: Substrate; The light-emitting device layer is located on the substrate and includes a first light-emitting unit and a second light-emitting unit. A pixel defining layer is located on the substrate and includes a first pixel opening, a second pixel opening, a first defining portion for defining the first pixel opening, and a second defining portion for defining the second pixel opening. The height of the first defining portion is greater than the height of the second defining portion. The first light-emitting unit is located in the first pixel opening, and the second light-emitting unit is located in the second pixel opening. The encapsulation structure layer is located on the side of the light-emitting device layer away from the substrate, and includes a first encapsulation part corresponding to the first light-emitting unit and a second encapsulation part corresponding to the second light-emitting unit. The first encapsulation part includes scattering particles, and the second encapsulation part includes quantum dots and scattering particles.

2. The display substrate according to claim 1, characterized in that, The first encapsulation part is located in the first pixel opening, and the second encapsulation part is located in the second pixel opening.

3. The display substrate according to claim 2, characterized in that, The light-emitting device layer includes a plurality of second light-emitting units, and the pixel defining layer includes a plurality of second pixel openings, wherein the plurality of second light-emitting units are located one-to-one in the plurality of second pixel openings; The encapsulation structure layer includes a plurality of second encapsulation parts corresponding one-to-one with the plurality of second light-emitting units. The plurality of second encapsulation parts are an integral structure, and the first encapsulation part and the second encapsulation part are independent of each other.

4. The display substrate according to claim 2 or 3, characterized in that, The encapsulation structure layer includes an organic encapsulation layer, which includes a first encapsulation portion and a second encapsulation portion.

5. The display substrate according to claim 4, characterized in that, The encapsulation structure layer further includes a first inorganic encapsulation layer and a second inorganic encapsulation layer, wherein the first inorganic encapsulation layer, the organic encapsulation layer, and the second inorganic encapsulation layer are stacked sequentially.

6. The display substrate according to any one of claims 1 to 5, characterized in that, The height of the first limiting part is in the range of [8μm, 13μm], and the height of the second limiting part is less than or equal to 3μm.

7. The display substrate according to any one of claims 1 to 6, characterized in that, Both the first light-emitting unit and the second light-emitting unit are used to emit light of a first color, and the quantum dots in the second encapsulation part include quantum dots of a second color and quantum dots of a third color; The quantum dots of the second color are used to emit light of the second color when excited by light of the first color; The third-color quantum dot is used to emit the third-color light when excited by the first-color light.

8. The display substrate according to claim 7, characterized in that, The second light-emitting unit is also used to emit light of the second color, and the quantum dot of the third color is also used to emit light of the third color when excited by the light of the second color.

9. The display substrate according to claim 7, characterized in that, Each of the first light-emitting unit and the second light-emitting unit includes a stacked first electrode, a light-emitting functional layer, and a second electrode; The light-emitting functional layer includes one light-emitting layer or multiple stacked light-emitting layers, wherein the light-emitting layer in the first light-emitting unit and the light-emitting layer in the second light-emitting unit are both used to emit light of the first color.

10. The display substrate according to claim 8, characterized in that, Each of the first light-emitting unit and the second light-emitting unit includes a stacked first electrode, a light-emitting functional layer, and a second electrode; The light-emitting functional layer in the first light-emitting unit includes one light-emitting layer or multiple stacked light-emitting layers, and all the light-emitting layers in the first light-emitting unit are used to emit light of the first color; The light-emitting functional layer in the second light-emitting unit includes a first light-emitting layer and a second light-emitting layer stacked together. The first light-emitting layer is used to emit light of the first color, and the second light-emitting layer is used to emit light of the second color.

11. The display substrate according to any one of claims 7 to 10, characterized in that, The first color is blue, the second color is green, and the third color is red.

12. The display substrate according to any one of claims 1 to 11, characterized in that, The display substrate further includes a color filter layer located on the side of the encapsulation structure layer away from the substrate.

13. A method for manufacturing a display substrate, characterized in that, The method includes: Provide substrates; A light-emitting device layer and a pixel defining layer are formed on the substrate. The light-emitting device layer includes a first light-emitting unit and a second light-emitting unit. The pixel defining layer includes a first pixel opening, a second pixel opening, a first defining portion for defining the first pixel opening, and a second defining portion for defining the second pixel opening. The height of the first defining portion is greater than the height of the second defining portion. The first light-emitting unit is located in the first pixel opening, and the second light-emitting unit is located in the second pixel opening. An encapsulation structure layer is formed on the side of the light-emitting device layer away from the substrate. The encapsulation structure layer includes a first encapsulation portion corresponding to the first light-emitting unit and a second encapsulation portion corresponding to the second light-emitting unit. The first encapsulation portion includes scattering particles, and the second encapsulation portion includes quantum dots and scattering particles.

14. The method according to claim 13, characterized in that, The first encapsulation part is located in the first pixel opening, and the second encapsulation part is located in the second pixel opening.

15. The method according to claim 14, characterized in that, The light-emitting device layer includes a plurality of second light-emitting units, and the pixel defining layer includes a plurality of second pixel openings, wherein the plurality of second light-emitting units are located one-to-one in the plurality of second pixel openings; The encapsulation structure layer includes a plurality of second encapsulation parts corresponding one-to-one with the plurality of second light-emitting units. The plurality of second encapsulation parts are an integral structure, and the first encapsulation part and the second encapsulation part are independent of each other.

16. The method according to claim 14 or 15, characterized in that, The formation of an encapsulation structure layer on the side of the light-emitting device layer away from the substrate includes: An organic encapsulation layer is formed on the side of the light-emitting device layer away from the substrate, the organic encapsulation layer including the first encapsulation portion and the second encapsulation portion.

17. The method according to claim 16, characterized in that, The method of forming an encapsulation structure layer on the side of the light-emitting device layer away from the substrate further includes: A first inorganic encapsulation layer and a second inorganic encapsulation layer are formed on the side of the light-emitting device layer away from the substrate, and the first inorganic encapsulation layer, the organic encapsulation layer and the second inorganic encapsulation layer are stacked sequentially.

18. The method according to claim 17, characterized in that, The height of the first limiting part is in the range of [8μm, 13μm], and the height of the second limiting part is less than or equal to 3μm.

19. The method according to any one of claims 13 to 18, characterized in that, Both the first light-emitting unit and the second light-emitting unit are used to emit light of a first color, and the quantum dots in the second encapsulation part include quantum dots of a second color and quantum dots of a third color; The quantum dots of the second color are used to emit light of the second color when excited by light of the first color; The third-color quantum dot is used to emit the third-color light when excited by the first-color light.

20. The method according to claim 19, characterized in that, The second light-emitting unit is also used to emit light of the second color, and the quantum dot of the third color is also used to emit light of the third color when excited by the light of the second color.

21. The method according to claim 19, characterized in that, Each of the first light-emitting unit and the second light-emitting unit includes a stacked first electrode, a light-emitting functional layer, and a second electrode; Forming a light-emitting device layer on the substrate includes: forming a first electrode, a light-emitting functional layer, and a second electrode stacked on the substrate. The light-emitting functional layer includes one light-emitting layer or multiple light-emitting layers stacked on the substrate. The light-emitting layer in the first light-emitting unit and the light-emitting layer in the second light-emitting unit are both used to emit light of the first color.

22. The method according to claim 20, characterized in that, Each of the first light-emitting unit and the second light-emitting unit includes a stacked first electrode, a light-emitting functional layer, and a second electrode; Forming a light-emitting device layer on the substrate includes: forming a first electrode, a light-emitting functional layer, and a second electrode stacked on the substrate. The light-emitting functional layer in the first light-emitting unit includes one light-emitting layer or multiple stacked light-emitting layers. The light-emitting layers in the first light-emitting unit are all used to emit light of the first color. The light-emitting functional layer in the second light-emitting unit includes a stacked first light-emitting layer and a second light-emitting layer. The first light-emitting layer is used to emit light of the first color, and the second light-emitting layer is used to emit light of the second color.

23. The method according to any one of claims 19 to 22, characterized in that, The first color is blue, the second color is green, and the third color is red.

24. The method according to any one of claims 13 to 23, characterized in that, The method further includes forming a color filter layer on the side of the encapsulation structure layer away from the substrate.

25. A display device, characterized in that, Includes the display substrate as described in any one of claims 1 to 12.

Images