Display substrate, manufacturing method thereof and display device

Abstract

The invention discloses a display substrate, a manufacturing method thereof and a display device, and belongs to the technical field of display. The display substrate comprises a substrate body, a light-emitting device layer and a pixel limiting layer which are located on the substrate body, and a packaging structure layer located on the side, away from the substrate body, of the light-emitting device layer. 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 limiting part is larger than that of the second limiting part, the first light-emitting units are located in the first pixel openings, and the second light-emitting units are located in the second pixel openings. The packaging structure layer comprises a first packaging part corresponding to the first light-emitting unit and a second packaging part corresponding to the second light-emitting unit, the first packaging part comprises scattering particles, and the second packaging part comprises quantum dots and scattering particles. The light emitting efficiency of the display substrate can be improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display substrate and a manufacturing method thereof, and a display device. Background Art

[0002] Quantum dot organic light emitting diode (QD-OLED) display substrate is a display substrate that combines OLED devices with quantum dots (QD). The principle of QD-OLED display substrate is to use blue light OLED devices to excite red light QD to emit red light and green light QD to emit green light, thereby achieving full-color display. QD-OLED display substrate has the characteristics of self-luminescence, high contrast, high color gamut, wide viewing angle, fast response speed, light and thin, and foldable.

[0003] At present, the QD-OLED display substrate includes an OLED device layer, an encapsulation structure layer and a color conversion pattern (CCP) stacked in sequence. The encapsulation structure layer is used to encapsulate the OLED device layer. The OLED device layer is used to emit blue light. The CCP includes red light QD and green light QD. The red light QD is used to emit red light under the excitation of the blue light emitted by the OLED device layer, and the green light QD is used to emit green light under the excitation of the blue light emitted by the OLED device layer.

[0004] However, in the current QD-OLED display substrate, the blue light emitted by the OLED device layer needs to pass through the packaging structure layer to reach the CCP. The optical path from the OLED device layer to the CCP is long, and light will be lost in the process of passing through the packaging structure layer, resulting in low light extraction efficiency of the QD-OLED display substrate. Summary of the invention

[0005] The present application provides a display substrate and a manufacturing method thereof, and a display device, which are helpful to improve the light extraction efficiency of the display substrate. The technical solution of the present application is as follows.

[0006] In a first aspect, a display substrate is provided, comprising:

[0007] substrate substrate;

[0008] A light emitting device layer, located on the base substrate, comprises a first light emitting unit and a second light emitting unit;

[0009] a pixel defining layer, located on the base substrate, 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 first light emitting unit is located in the first pixel opening, and the second light emitting unit is located in the second pixel opening;

[0010] The packaging structure layer is located on the side of the light-emitting device layer away from the base substrate, and includes a first packaging part corresponding to the first light-emitting unit and a second packaging part corresponding to the second light-emitting unit, the first packaging part includes scattering particles, and the second packaging part includes quantum dots and scattering particles.

[0011] Optionally, the first encapsulation portion is located in the first pixel opening, and the second encapsulation portion is located in the second pixel opening.

[0012] 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 packaging structure layer includes a plurality of second packaging parts corresponding one-to-one to the plurality of second light-emitting units, the plurality of second packaging parts are an integrated structure, and the first packaging part and the second packaging part are independent of each other.

[0013] Optionally, the encapsulation structure layer includes an organic encapsulation layer, and the organic encapsulation layer includes the first encapsulation part and the second encapsulation part.

[0014] Optionally, the encapsulation structure layer further includes a first inorganic encapsulation layer and a second inorganic encapsulation layer, and the first inorganic encapsulation layer, the organic encapsulation layer and the second inorganic encapsulation layer are stacked in sequence.

[0015] Optionally, the height of the first defining portion is in the range of [8 μm, 13 μm], and the height of the second defining portion is less than or equal to 3 μm.

[0016] Optionally, the first light-emitting unit and the second light-emitting unit are both used to emit light of a first color, and the quantum dots in the second packaging part include quantum dots of a second color and quantum dots of a third color;

[0017] The quantum dots of the second color are used to emit light of the second color under the excitation of the light of the first color;

[0018] The quantum dots of the third color are used to emit the light of the third color under the excitation of the light of the first color.

[0019] Optionally, 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 under the excitation of the light of the second color.

[0020] 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; the light-emitting functional layer includes one light-emitting layer or a plurality of stacked light-emitting layers, and 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.

[0021] 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; the light-emitting functional layer in the first light-emitting unit includes one light-emitting layer or a plurality of stacked light-emitting layers, and 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.

[0022] Optionally, the first color is blue, the second color is green, and the third color is red.

[0023] Optionally, the display substrate further includes: a color filter layer located on a side of the encapsulation structure layer away from the base substrate.

[0024] Optionally, both the first light-emitting unit and the second light-emitting unit are OLED light-emitting units.

[0025] Optionally, the quantum dots include at least one of the following: II-VI group quantum dots, IV-VI group quantum dots, III-V group quantum dots or I-III-VI group quantum dots.

[0026] In a second aspect, a method for manufacturing a display substrate is provided, the method comprising:

[0027] providing a substrate base plate;

[0028] A light-emitting device layer and a pixel defining layer are formed on the base substrate, wherein the light-emitting device layer includes a first light-emitting unit and a second light-emitting unit, and 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, wherein 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;

[0029] A packaging structure layer is formed on a side of the light-emitting device layer away from the base substrate, the packaging structure layer includes a first packaging part corresponding to the first light-emitting unit and a second packaging part corresponding to the second light-emitting unit, the first packaging part includes scattering particles, and the second packaging part includes quantum dots and scattering particles.

[0030] Optionally, the first encapsulation portion is located in the first pixel opening, and the second encapsulation portion is located in the second pixel opening.

[0031] 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 packaging structure layer includes a plurality of second packaging parts corresponding one-to-one to the plurality of second light-emitting units, the plurality of second packaging parts are an integrated structure, and the first packaging part and the second packaging part are independent of each other.

[0032] Optionally, forming a packaging structure layer on a side of the light-emitting device layer away from the base substrate includes: forming an organic packaging layer on a side of the light-emitting device layer away from the base substrate, the organic packaging layer including the first packaging part and the second packaging part.

[0033] Optionally, the packaging structure layer is formed on the side of the light-emitting device layer away from the base substrate, and also includes: forming a first inorganic packaging layer and a second inorganic packaging layer on the side of the light-emitting device layer away from the base substrate, the first inorganic packaging layer, the organic packaging layer and the second inorganic packaging layer are stacked in sequence.

[0034] Optionally, the height of the first defining portion is in the range of [8 μm, 13 μm], and the height of the second defining portion is less than or equal to 3 μm.

[0035] Optionally, the first light-emitting unit and the second light-emitting unit are both used to emit light of a first color, and the quantum dots in the second packaging part include quantum dots of a second color and quantum dots of a third color;

[0036] The quantum dots of the second color are used to emit light of the second color under the excitation of the light of the first color;

[0037] The quantum dots of the third color are used to emit the light of the third color under the excitation of the light of the first color.

[0038] Optionally, 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 under the excitation of the light of the second color.

[0039] 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;

[0040] A light-emitting device layer is formed on the base substrate, including: the first electrode, the light-emitting functional layer and the second electrode are stacked on the base substrate, the light-emitting functional layer includes one light-emitting layer or multiple stacked light-emitting layers, and 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.

[0041] 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;

[0042] A light-emitting device layer is formed on the base substrate, comprising: the first electrode, the light-emitting functional layer and the second electrode are stacked on the base substrate, the light-emitting functional layer in the first light-emitting unit comprises one light-emitting layer or a plurality of 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 comprises 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.

[0043] Optionally, the first color is blue, the second color is green, and the third color is red.

[0044] Optionally, the method further includes: forming a color filter layer on a side of the packaging structure layer away from the base substrate.

[0045] Optionally, both the first light-emitting unit and the second light-emitting unit are OLED light-emitting units.

[0046] 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.

[0047] In a third aspect, a display device is provided, comprising a display substrate provided by the first aspect or any optional implementation of the first aspect.

[0048] The beneficial effects of the technical solution provided by this application include:

[0049] In the display substrate provided by the present application, 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, and 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 is located in the first pixel opening, and the second light-emitting unit is 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 the light emitted by the second light-emitting unit, so the second encapsulation portion can realize light conversion. The encapsulation structure layer can encapsulate the light-emitting device layer on the one hand, and on the other hand, it can be used as a color conversion pattern (CCP) to convert the light emitted by the light-emitting unit. As a result, the optical path from the light-emitting device layer to the CCP (that is, the encapsulation structure layer in the present application) is short, and the light emitted by the light-emitting device layer reaches the encapsulation structure layer and also reaches the CCP. The light emitted by the light-emitting device layer has less loss in the process of reaching the CCP, which helps to improve the light extraction efficiency of the display substrate. Furthermore, since the encapsulation structure layer can be used 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, respectively. 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 the light emitted by the display substrate and avoiding color deviation of the display substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 is a front view of a display substrate provided in an embodiment of the present application;

[0052] Figure 2 yes Figure 1 A cross-sectional view of the AA portion of the display substrate shown;

[0053] Figure 3 is a schematic diagram of a light-emitting unit provided in an embodiment of the present application;

[0054] Figure 4 is a schematic diagram of another light-emitting unit provided in an embodiment of the present application;

[0055] Figure 5 is a schematic diagram of another light-emitting unit provided in an embodiment of the present application;

[0056] Figure 6 is a cross-sectional view of another display substrate provided in an embodiment of the present application;

[0057] Figure 7 is a cross-sectional view of another display substrate provided in an embodiment of the present application;

[0058] Figure 8 is a flow chart of a method for manufacturing a display substrate provided in an embodiment of the present application;

[0059] Figures 9 to 17 It is a schematic diagram of a manufacturing process of a display substrate provided in an embodiment of the present application.

[0060] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0061] In order to make the principles, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0062] Please refer to Figure 1 and Figure 2 , Figure 1 is a front view of a display substrate 100 provided in an embodiment of the present application, Figure 2 yes Figure 1 The cross-sectional view of the AA portion of the display substrate 100 is shown in FIG. Figure 1 and Figure 2 As shown, the display substrate 100 includes a base 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 base substrate 11, and the encapsulation structure layer 14 is located on a side of the light emitting device layer 12 away from the base substrate 11. The encapsulation structure layer 14 is used to encapsulate the light emitting device layer 12 to prevent the light emitting device layer 12 from being corroded by external water vapor, oxygen, etc.

[0063] Among them, 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 ( Figure 2 A first light emitting unit 12B) and a plurality of second light emitting units ( Figure 2 Two second light-emitting units are shown, 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, the plurality of first light-emitting units 12B are located in the plurality of first pixel openings in a one-to-one correspondence, and the plurality of second light-emitting units are located in the plurality of second pixel openings in a one-to-one correspondence. The encapsulation structure layer 14 includes a plurality of first encapsulation portions 142B ( Figure 2 A first packaging part 142B corresponding to a first light emitting unit 12B and a plurality of second packaging parts ( Figure 2 Two second packaging parts are shown, namely, a second packaging part 142G corresponding to the second light-emitting unit 12G and a second packaging part 142R corresponding to the second light-emitting unit 12R. The first packaging part 142B includes scattering particles 422, the second packaging part 142G includes quantum dots 421 and scattering particles 422, and the second packaging part 142R includes quantum dots 421 and scattering particles 422.

[0064] 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, the plurality of second light-emitting units 12R are located in a plurality of second pixel openings in a one-to-one correspondence, the plurality of second light-emitting units 12G are located in a plurality of second pixel openings in a one-to-one correspondence, and the second light-emitting units 12R and the second light-emitting units 12G are located in different second pixel openings. The encapsulation structure layer 14 includes a plurality of second encapsulation parts 142G corresponding to the plurality of second light-emitting units 12G in a one-to-one correspondence, and a plurality of second encapsulation parts 142R corresponding to the plurality of second light-emitting units 12R in a one-to-one correspondence, each second encapsulation part 142G includes a quantum dot 421 and a scattering particle 422, and each second encapsulation part 142R includes a quantum dot 421 and a scattering particle 422.

[0065] The orthographic projection of the first encapsulation part 142B corresponding to any one of the first light-emitting units 12B on the base substrate 11 covers the first light-emitting unit 12B, and the scattering particles 422 in the first encapsulation part 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. The orthographic projection of the second encapsulation part 142G corresponding to any one of the second light-emitting units 12G on the base substrate 11 covers the second light-emitting unit 12G, the quantum dots 421 in the second encapsulation part 142G corresponding to any one of the second light-emitting units 12G are used to emit light under the excitation of the light emitted by the second light-emitting unit 12G, and the scattering particles 422 in the second encapsulation part 142G corresponding to any one of the second light-emitting units 12G are used to scatter the light emitted by the second light-emitting unit 12G and the light emitted by the quantum dots 421 in the second encapsulation part 142G. The orthographic projection of the second packaging part 142R corresponding to any second light-emitting unit 12R on the base substrate 11 covers the second light-emitting unit 12R, the quantum dots 421 in the second packaging part 142R corresponding to any second light-emitting unit 12R are used to emit light under the excitation of the light emitted by the second light-emitting unit 12R, and the scattering particles 422 in the second packaging part 142R corresponding to any second light-emitting unit 12R are used to scatter the light emitted by the second light-emitting unit 12R and the light emitted by the quantum dots 421 in the second packaging part 142R.

[0066] The height of the first limiting portion 131 is the dimension of the first limiting portion 131 in the direction y perpendicular to the board surface of the substrate 11. The height of the second limiting portion 132 is the dimension of the second limiting portion 132 in the direction perpendicular to the board surface of the substrate 11. The substrate substrate is also called a substrate (SUB). In the embodiment of the present application, the substrate substrate 11 can be a rigid substrate made of a light-guiding and non-metallic transparent material with a certain degree of firmness such as glass or quartz. For example, the substrate substrate 11 is a glass substrate (glass). Alternatively, the substrate substrate 11 can be a flexible substrate made of a flexible material such as polyimide (PI).

[0067] It should be noted that, generally, the first pixel opening and the second pixel opening may be adjacent to each other, and the adjacent first pixel opening and the second pixel opening may share a defining portion, so all or part of the first defining portion used to define the first pixel opening may also be used to define the second pixel opening. Figure 2As shown, 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 embodiment of the present 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.

[0068] In summary, in the display substrate provided by the embodiment of the present application, the light-emitting device layer includes a first light-emitting unit and a second light-emitting unit, 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, and the quantum dots in the second encapsulation part are used to emit light under the excitation of the light emitted by the second light-emitting unit, so the second encapsulation part can realize light conversion, for example, realize light color conversion. The encapsulation structure layer can encapsulate the light-emitting device layer on the one hand, and on the other hand, it can be used as a color conversion pattern (CCP) to convert the light emitted by the light-emitting unit. As a result, the optical path from the light-emitting device layer to the CCP (that is, the encapsulation structure layer in the embodiment of the present application) is short, and the light emitted by the light-emitting device layer reaches the encapsulation structure layer and also reaches the CCP. The light emitted by the light-emitting device layer has less loss in the process of reaching the CCP, which helps to improve the light extraction efficiency of the display substrate. In addition, since the encapsulation structure layer can be used as a CCP to convert the light emitted by the light-emitting unit, there is no need to set up a CCP additionally, which can save the process of manufacturing the CCP and simplify the manufacturing process flow of the display substrate.

[0069] In addition, the first packaging part and the second packaging part also include scattering particles, respectively. The scattering particles in the first packaging part can scatter the light emitted by the first light-emitting unit, and the scattering particles in the second packaging part can scatter the light emitted by the second light-emitting unit and the light emitted by the quantum dots in the second packaging part, thereby improving the uniformity of the light output of the display substrate and avoiding color deviation of the display substrate.

[0070] In an optional embodiment, if Figure 2As shown, the first encapsulation part 142B is located in the first pixel opening, and the second encapsulation part (including the second encapsulation part 142G and the second encapsulation part 142R) is located in the second pixel opening. In a specific embodiment, each first encapsulation part 142B and the first light-emitting unit 12B corresponding to the first encapsulation part 142B are located in the same first pixel opening, and each first encapsulation part 142B is located on the side of the corresponding first light-emitting unit 12B away from the substrate 11. Each second encapsulation part 142G and the second light-emitting unit 12G corresponding to the second encapsulation part 142G are located in the same second pixel opening, and each second encapsulation part 142G is located on the side of the corresponding second light-emitting unit 12G away from the substrate 11. Each second encapsulation part 142R and the second light-emitting unit 12R corresponding to the second encapsulation part 142R are located in the same second pixel opening, and each second encapsulation part 142R is located on the side of the corresponding second light-emitting unit 12R away from the substrate 11.

[0071] In an optional embodiment, in the display substrate 100, the plurality of second encapsulation parts are an integrated structure, and the first encapsulation part 142B is independent of the second encapsulation part. For example, all the second encapsulation parts are an integrated structure, all the first encapsulation parts 142B are independent of the second encapsulation parts, and any two first encapsulation parts 142B are independent of each other. Figure 2 As shown, the second encapsulation part 142G and the second encapsulation part 142R are an integral structure, the first encapsulation part 142B and the second encapsulation part 142G are independent of each other, and the first encapsulation part 142B and the second encapsulation part 142R are independent of each other. Since the multiple second encapsulation parts are an integral structure, the multiple second encapsulation parts can be manufactured by the same process, which can simplify the process flow of manufacturing the multiple second encapsulation parts, reduce the process difficulty of manufacturing the multiple second encapsulation parts, and thus reduce the process difficulty of manufacturing the display substrate 100.

[0072] In an optional embodiment, if Figure 2As shown, the encapsulation structure layer 14 includes an organic encapsulation layer 142, and the organic encapsulation layer 142 includes a first encapsulation part 142B and a second encapsulation part (including a second encapsulation part 142G and a second encapsulation part 142R). In a specific embodiment, the encapsulation structure layer 14 also includes a first inorganic encapsulation layer 141 and a second inorganic encapsulation layer 143, and the first inorganic encapsulation layer 141, the organic encapsulation layer 142 and the second inorganic encapsulation layer 143 are stacked in sequence in a direction away from the base substrate 11. The thickness of the organic encapsulation layer 142 is in the range of [8μm, 10μm]. The material of the organic encapsulation layer 142 is an organic material, including but not limited to an organic resin. For example, the material of the first encapsulation part 142B is a methyl methacrylate solution doped with scattering particles, and the material of the second encapsulation part 142B is a methyl methacrylate solution doped with quantum dots and scattering particles. The first inorganic encapsulation layer 141 may 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 a plurality of stacked sub-inorganic layers), the material of the first inorganic encapsulation layer 141 is an inorganic material, including but not limited to one or more combinations of silicon oxide (SiOx), silicon nitride (SiNx), or silicon oxynitride (SiOxNy), and the refractive index of the first inorganic encapsulation layer 141 may be in the range of [1.45, 1.8]. The second inorganic encapsulation layer 143 may 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 more combinations of SiOx, SiNx, or SiOxNy, and the refractive index of the second inorganic encapsulation layer 143 may be [1.45, 1.8].

[0073] The encapsulation structure layer 14 may be a thin film encapsulation (TFE) structure layer. Figure 2 Take the encapsulation structure layer including two inorganic encapsulation layers and one organic encapsulation layer as an example. In other embodiments, the encapsulation structure layer includes multiple inorganic encapsulation layers and multiple organic encapsulation layers, and the inorganic encapsulation layers and the organic encapsulation layers are alternately stacked. For example, the encapsulation structure layer includes 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 stacked in sequence. In this case, at least one organic encapsulation layer includes the above-mentioned first encapsulation part and the second encapsulation part, which is not limited in the embodiments of the present application.

[0074] In an optional embodiment, the height of the first limiting portion 131 ranges from [8μm, 13μm], and the height of the second limiting portion 132 is less than or equal to 3μm. The height of the first limiting portion 131 and the height of the second limiting portion 132 can be set according to actual conditions. For example, the height of the first limiting portion 131 is 8μm (micrometers), 9μm, 10μm or 11μm, and the height of the second limiting portion 132 is 3μm, 2.8μm or 2.5μm. This height setting can isolate the first pixel opening and the second pixel opening from each other, thereby facilitating the manufacture of mutually independent first packaging portions and second packaging portions, and also facilitating the manufacture of multiple second packaging portions as an integrated structure.

[0075] In an optional 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) are both used to emit light of the first color, and the quantum dots 421 in the second encapsulation part (including the second encapsulation part 142G and the second encapsulation part 142R) include quantum dots of the second color and quantum dots of the third color. The quantum dots of the second color are used to emit light of the second color under the excitation of the light of the first color, so that the quantum dots of the second color are used to convert 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 under the excitation of the light of the first color, so that the quantum dots of the third color are used to convert 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 part, the light of the first color excites the quantum dots of the second color in the second encapsulation part 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 part to emit light of the third color.

[0076] 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 the third color are also used to emit light of a third color under the excitation of the light of the second color, so that the quantum dots of the third color are also used to convert the light of the second color into light of a third color. After the light of the second color emitted by the second light-emitting unit enters the corresponding second packaging part, the light of the second color excites the quantum dots of the third color in the second packaging part to emit light of the third color. In other embodiments, the first light-emitting unit 12B can also be used to emit light of a second color. That is, the first light-emitting unit 12B is used to emit light of a first color and light of a second color, and the embodiments of the present application are not limited to this.

[0077] In the embodiment of the present 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.

[0078] It should be noted that quantum dots are nano-scale semiconductor materials with cores and shells, which can emit light of a specific frequency under the excitation of light or electricity, and the frequency of the light emitted by the quantum dots is related to the size of the quantum dots. Quantum dots have the characteristics of narrow emission spectrum, wide adjustable color range, and long fluorescence lifetime. In the embodiment of the present application, "quantum dots of the second color" means that the color of the light emitted by the quantum dots includes the second color, and does not mean that the color of the quantum dots is the second color. The color of the quantum dots of the second color may be the second color or may not be the second color. "Quantum dots of the third color" means that the color of the light emitted by the quantum dots includes the third color, and does not mean that the color of the quantum dots is the third color. The color of the quantum dots of the third color may be the third color or may not be the third color. The embodiment of the present application does not limit this. In an optional embodiment, the quantum dot 421 includes at least one of the following: II-VI group quantum dots, IV-VI group quantum dots, III-V group quantum dots, or I-III-VI group quantum dots. Among them, II-VI group quantum dots refer to quantum dots composed of group II elements and group VI elements. For example, cadmium (Cd) series quantum dots are II-VI group quantum dots. IV-VI group quantum dots refer to quantum dots composed of group IV elements and group VI elements. III-V group quantum dots refer to quantum dots composed of group III elements and group V elements, for example, indium phosphide (InP) series quantum dots are group III-V quantum dots. I-III-VI group quantum dots refer to quantum dots composed of group I elements, group III elements 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 series quantum dot.

[0079] In an optional embodiment, if Figure 2As shown, the display substrate 100 further includes a color filter layer 15, which is also called a color filter (CF). The color filter layer 15 is located on the side of the encapsulation structure layer 14 away from the base substrate 11. The color filter layer 15 is used to filter the light emitted by the light-emitting unit (including the first light-emitting unit and the second light-emitting unit) and the light emitted by the quantum dots in the second encapsulation part. In a specific embodiment, the color filter layer 15 includes a first filter part 15B corresponding to the first light-emitting unit 12B, a second filter part 15G corresponding to the third light-emitting unit 12G, and a third filter part 15R corresponding to the second light-emitting unit 12R. The orthographic projection of the first filter part 15B on the base substrate 11 covers the first light-emitting unit 12B, the orthographic projection of the second filter part 15G on the base substrate 11 covers the second light-emitting unit 12G, and the orthographic projection of the third filter part 15R on the base substrate 11 covers the second light-emitting unit 12R. The first filter part 15B allows the light of the first color to pass through and prohibits the light of other colors except the first color from passing through. The second filter section 15G allows the light of the second color to pass through and prohibits the light of other colors except the second color from passing through. The third filter section 15R allows the light of the third color to pass through and prohibits the light of other colors except the third color from passing through. The light emitted by the first light-emitting unit 12B (including the light of the first color and possibly the light of the second color) enters the corresponding first packaging section 142B; the scattering particles 422 in the first packaging section 142B scatter the light entering the first packaging section 142B; the light emitted from the first packaging section 142B enters the corresponding first filter section 15B; the first filter section 15B filters the light entering the first filter section 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 section 15B. The light emitted by the second light-emitting unit 12G (including the light of the first color, and possibly including the light of the second color) is incident on the corresponding second packaging part 142G; the light incident on the second packaging part 142G excites the quantum dots of the second color in the second packaging part 142G to emit the light of the second color, and excites the quantum dots of the third color in the second packaging part 142G to emit the light of the third color; the scattering particles 422 in the second packaging part 142G scatter the light incident on the second packaging part 142G and the light emitted by the quantum dots 421 in the second packaging part 142G; the light emitted from the second packaging part 142G (the light emitted from the second packaging part 142G is a mixed light of the first color, the second color and the third color) is incident on the corresponding second filter part 15G; the second filter part 15G filters the light incident on the second filter part 15G to allow the light of the second color to pass through.The light emitted by the second light-emitting unit 12R (including the light of the first color, and possibly including the light of the second color) is incident on the corresponding second packaging part 142R; the light incident on the second packaging part 142R excites the quantum dots of the second color in the second packaging part 142R to emit the light of the second color, and excites the quantum dots of the third color in the second packaging part 142R to emit the light of the third color; the scattering particles 422 in the second packaging part 142R scatter the light incident on the second packaging part 142R and the light emitted by the quantum dots 421 in the second packaging part 142R; the light emitted from the second packaging part 142R (the light emitted from the second packaging part 142R is a mixed light of the first color, the second color and the third color) is incident on the corresponding third filter part 15R; the third filter part 15R filters the light incident on the third filter part 15R to allow the light of the third color to pass through. Thus, the first color (eg, blue) light is emitted from the first filter portion 15B, the second color (eg, green) light is emitted from the second filter portion 15G, and the third color (eg, red) light is emitted from the third filter portion 15R, and the display substrate 100 can achieve full-color display. Figure 1 As shown, the display substrate 100 includes a plurality of sub-pixels arranged in an array, and the plurality of sub-pixels include a sub-pixel 10B of a first color, a sub-pixel 10G of a second color, and a sub-pixel 10R of a third color. The sub-pixel 10B of the first color includes a first light-emitting unit 12B, a first encapsulation portion 142B corresponding to the first light-emitting unit 12B, and a first filter portion 15B corresponding to the first light-emitting unit 12B. The sub-pixel 10G of the second color includes a second light-emitting unit 12G, a second encapsulation portion 142G corresponding to the second light-emitting unit 12G, and a second filter portion 15G corresponding to the second light-emitting unit 12G. The sub-pixel 10R 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 the light of the first color is emitted from the first filter section 15B, the light of the second color is emitted from the second filter section 15G, and the light of the third color is emitted from the third filter section 15R, the display substrate 100 can realize that the sub-pixel 10B of the first color displays the first color, the sub-pixel 10G of the second color displays the second color, and the sub-pixel 10R of the third color displays the third color. It should be noted that "the sub-pixel of the first color" means that the sub-pixel can display the first color, not that the color of the sub-pixel is the first color. "The sub-pixel of the second color" means that the sub-pixel can display the second color, not that the color of the sub-pixel is the second color. "The sub-pixel of the third color" means that the sub-pixel can display the third color, not that the color of the sub-pixel is the third color. The embodiments of the present application do not limit this.

[0080] The material of the color filter layer 15 may be a resin material to which a dye is added. For example, the material of the first filter portion 15B is a resin material to which a dye of a first color is added, the material of the second filter portion 15G is a resin material to which a dye of a second color is added, and the material of the third filter portion 15R is a resin material to which a dye of a third color is added. It should be noted that "a dye of a first color" means that the dye allows light of a first color to pass through and prohibits light of other colors except the first color from passing through (for example, the dye does not absorb light of the first color but absorbs light of other colors except the first color), and does not mean that the color of the dye is the first color. The color of the dye of the first color may be the first color or may not be the first color. "A dye of a second color" means that the dye allows light of a second color to pass through and prohibits light of other colors except the second color from passing through (for example, the dye does not absorb light of the second color but absorbs light of other colors except the second color), and does not mean that the color of the dye is the second color. The color of the dye of the second color may be the second color or may not be the second color. “Dye of a third color” means that the dye allows light of the third color to pass through but prohibits light of other colors except the third color from passing through (for example, the dye does not absorb light of the third color but absorbs light of other colors except the third color), and does not mean that the color of the dye is the third color. The color of the dye of the third color may be the third color or may not be the third color. The embodiments of the present application do not limit this.

[0081] In an optional embodiment, if Figure 2 As shown, 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 base 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, and 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), and the plurality of filter portions are located in the plurality of black matrix openings in a one-to-one correspondence. Among them, the light shielding portion 161 between any two black matrix openings is used to shield the filter portions in the any two black matrix openings to prevent the light emitted from the filter portions in the any two black matrix openings from crosstalk.

[0082] In an optional embodiment, if Figure 2 As shown, the display substrate 100 further includes a protective layer 17. The protective layer 17 is located on a side of the color filter layer 15 away from the base substrate 11, and 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.

[0083] In an optional embodiment, if Figure 2As shown, each of 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, and the light-emitting functional layer 122 is 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 called an anode (anode, AE) or a pixel electrode, and the second electrode 123 is also called a cathode (cathode, CE) or a common electrode.

[0084] In an embodiment of the present application, the light-emitting functional layer 122 includes an emission layer (EML) or a plurality of stacked light-emitting layers. In the case where the light-emitting functional layer 122 includes a plurality of stacked light-emitting layers, the plurality of light-emitting layers are used to emit light of the same color. For example, the plurality of light-emitting layers are all used to emit light of a first color. Alternatively, in the case where the light-emitting functional layer 122 includes a plurality of stacked light-emitting layers, the plurality of light-emitting layers are used to emit light of different colors. For example, some of the plurality of light-emitting layers are used to emit light of a first color, and other light-emitting layers are used to emit light of a second color.

[0085] In one 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) are both used to emit light of the first color. For example, the first light-emitting unit 12B is only used 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 only used to emit light of the first color. Each of 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, and the light-emitting functional layer 122 includes one light-emitting layer or a plurality of stacked light-emitting layers, and the light-emitting layer in the first light-emitting unit 12B and the light-emitting layer in the second light-emitting unit are both 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 is independent of the light-emitting functional layer 122 of the second light-emitting unit, and / or the light-emitting functional layers 122 of different second light-emitting units (for example, the second light-emitting unit 12G and the second light-emitting unit 12R) are independent of each other. In the case where 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, 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. In the case where 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, 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.

[0086] 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 the first color and light of the second color. Each of 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 of the first light-emitting unit 12B includes one light-emitting layer or a plurality of stacked light-emitting layers, and the light-emitting layers in the first light-emitting unit 12B are all 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 a plurality of light-emitting layers, some of which are used to emit light of the first color, and other light-emitting layers 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 is used to emit light of the first color, and the second light-emitting layer is used to emit light of the second color. The number of the first light-emitting layers can be one or more, and the number of the second light-emitting layers can be one or more, which is not limited in the embodiment of the present application.

[0087] In an optional embodiment, 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 each include a plurality of light-emitting layers, some of which are used to emit light of a first color, and the other light-emitting layers 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 are independent of each other. In the case where 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.

[0088] In an optional embodiment, 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, the first light-emitting unit 12B and the second light-emitting unit are both used to emit light of the first color, or the first light-emitting unit 12B and the second light-emitting unit are both used to emit light of the first color and light of the second color, and the first light-emitting unit 12B and the second light-emitting unit share the light-emitting functional layer 122. Figure 2Taking the example that the first light-emitting unit 12B and the second light-emitting unit share the light-emitting functional layer 122, in other embodiments, 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 layers 122 of different second light-emitting units are independent of each other, which is not limited in the embodiments of the present application.

[0089] The structure of the light-emitting unit (the first light-emitting unit or the second light-emitting unit) of the present application is introduced below.

[0090] In one embodiment, the light-emitting unit includes a stacked first electrode 121, a light-emitting functional layer 122, and a second electrode 123, wherein the light-emitting functional layer 122 includes a light-emitting layer. Figure 3 , which shows a schematic diagram of a light emitting unit 120 provided in an embodiment of the present application. The light emitting unit 120 may be any one of the first light emitting unit 12B, the second light emitting unit 12G or the second light emitting unit 12R. Figure 3 As shown, the light-emitting functional layer 122 is located between the first electrode 121 and the second electrode 122, and 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, the hole transport layer 1221, the light-emitting layer 1222, the electron transport layer 1223 and the second electrode 122 are stacked in sequence. The light-emitting layer 1222 is used to emit light of a first color.

[0091] In another embodiment, the light-emitting unit includes a stacked first electrode 121, a light-emitting functional layer 122, and a second electrode 123, and the light-emitting functional layer 122 includes two light-emitting layers. Figure 4 , which shows a schematic diagram of another light emitting unit 120 provided in an embodiment of the present application. The light emitting unit 120 may be any one of the first light emitting unit 12B, the second light emitting unit 12G or the second light emitting unit 12R. Figure 4As shown, the light-emitting functional layer 122 is located between the first electrode 121 and the second electrode 122, and 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 in sequence. The light-emitting layer 1222 and the light-emitting layer 1224 are both used to emit light of the first color, or some of the light-emitting layers 1222 and the light-emitting layer 1224 are used to emit light of the first color, and the other light-emitting layers are used to emit light of the second color. For example, in the case where the light-emitting unit 120 is the first light-emitting unit 12B, the light-emitting layer 1222 and the light-emitting layer 1224 are both used to emit light of the first color. In the case where the light-emitting unit 120 is the second light-emitting unit 12G or the second light-emitting unit 12R, the light-emitting layer 1222 and the light-emitting layer 1224 are both used to emit light of the first color, or some of the light-emitting layers 1222 and the light-emitting layer 1224 are used to emit light of the first color, and the other light-emitting layers 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 the first color, the light-emitting layer 1224 is used to emit light of the 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.

[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, and the light-emitting functional layer 122 includes three light-emitting layers. Figure 5 , which shows a schematic diagram of another light emitting unit 120 provided in an embodiment of the present application. The light emitting unit 120 may be any one of the first light emitting unit 12B, the second light emitting unit 12G or the second light emitting unit 12R. Figure 5As shown, the light-emitting functional layer 122 is located between the first electrode 121 and the second electrode 122, and the light-emitting functional layer 122 includes a stacked hole transport layer 1221, a light-emitting layer 1222, a charge generation layer 1223, a light-emitting layer 1224, a charge generation layer 1225, a light-emitting layer 1226, and an electron transport layer 1227. The first electrode 121, the hole transport layer 1221, the light-emitting layer 1222, the charge generation layer 1223, the light-emitting layer 1224, the charge generation layer 1225, the light-emitting layer 1226, the electron transport layer 1227 and the second electrode 122 are stacked in sequence. The light-emitting layer 1222, the light-emitting layer 1224 and the light-emitting layer 1226 are all used to emit light of the first color, or some of the light-emitting layers 1222, the light-emitting layer 1224 and the light-emitting layer 1226 are used to emit light of the first color, and the other light-emitting layers are used to emit light of the second color. For example, when the light-emitting unit 120 is the first light-emitting unit 12B, the light-emitting layer 1222, the light-emitting layer 1224, and the light-emitting layer 1226 are all used to emit light of the first color. When the light-emitting unit 120 is the second light-emitting unit 12G or the second light-emitting unit 12R, the light-emitting layer 1222, the light-emitting layer 1224, and the light-emitting layer 1226 are all used to emit light of the first color, or some of the light-emitting layers 1222, the light-emitting layer 1224, and the light-emitting layer 1226 are used to emit light of the first color, and the other light-emitting layers 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 and the light-emitting layer 1226 are used to emit light of the first color, the light-emitting layer 1224 is used to emit light of the second color, the light-emitting layer 1222 and the light-emitting layer 1226 are the first light-emitting layer described above, and the light-emitting layer 1224 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 layer 1222 and the light-emitting layer 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 layer 1222 and the light-emitting layer 1224 are the first light-emitting layer 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 layer 1224 and the light-emitting layer 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 layer 1224 and the light-emitting layer 1226 are the first light-emitting layer described above, and the light-emitting layer 1222 is the second light-emitting layer described above.

[0093] Understandably, Figures 3 to 5The light-emitting unit shown is only for example, and the light-emitting functional layer 122 may also include other functional film layers. For example, the light-emitting functional layer 122 also includes 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 more than three light-emitting layers, which is not limited in the present embodiment of the application.

[0094] 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.

[0095] In an optional embodiment, if Figure 2 As shown, the display substrate 100 also includes a circuit layer 18. The circuit layer 18 is located between the base 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 switch unit 181 corresponding to each light-emitting unit, and the switch unit 181 corresponding to each light-emitting unit is electrically connected to the light-emitting unit. The switch unit 181 corresponding to each light-emitting unit is used to control the light-emitting unit to emit light or turn off. In a specific embodiment, the switch unit 181 corresponding to each light-emitting unit is electrically connected to the first electrode 121 in the light-emitting unit. Among them, the switch unit 181 can be a thin film transistor (TFT).

[0096] Figure 2 The height of the first limiting portion 131 is greater than the height of the second limiting portion 132, the plurality of second encapsulation portions are an integrated structure, and the first encapsulation portion 142B and the second encapsulation portion 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, the plurality of second encapsulation portions are an integrated structure, and the first encapsulation portion 142B and the second encapsulation portion are an integrated 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 portion 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.

[0097] Please refer to Figure 6 , which shows a cross-sectional view of another display substrate 200 provided in an embodiment of the present application. Figure 6 The front view of the display substrate 200 is shown in FIG. Figure 1 Similar, I will not go into details here. Figure 6,and Figure 2 The display substrate 100 shown is different in that Figure 6 In the display substrate 200 shown, the height of the first defining portion 131 is equal to the height of the second defining portion 132, a plurality of second encapsulation portions (including the second encapsulation portion 142G and the second encapsulation portion 142R) are an integrated structure, and the first encapsulation portion 142B is an integrated structure with the second encapsulation portion, and the first encapsulation portion 142B further includes quantum dots 421. That is, the first encapsulation portion 142B, the second encapsulation portion 142G, and the second encapsulation portion 142R are an integrated structure, and each of the first encapsulation portion 142B, the second encapsulation portion 142G, and the second encapsulation portion 142R includes a quantum dot 421 and scattering particles 422.

[0098] In an optional embodiment, Figure 6 In the display substrate 200 shown, all the defining parts in the pixel defining layer 13 have the same height, all the encapsulation parts in the encapsulation structure layer 14 (specifically, all the encapsulation parts in the organic encapsulation layer 142) are an integrated structure, and each encapsulation part includes a quantum dot 421 and a scattering particle 422. For example, the height of all the defining parts in the pixel defining layer 13 is less than or equal to 3 μm, and the height of all the defining parts in the pixel defining layer 13 is the same.

[0099] In an optional embodiment, Figure 6 In the display substrate 200 shown, 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 the first color, and the first light-emitting unit 12B and the second light-emitting unit can also be used to emit light of the second color, the quantum dots 421 in the first encapsulation part 142B include quantum dots of the second color and quantum dots of the third color, and the quantum dots 421 in the second encapsulation part (including the second encapsulation part 142G and the second encapsulation part 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 the light of the first color, and may also include the light of the second color) enters the corresponding first encapsulation part 142B, the quantum dots of the second color in the first encapsulation part 142B are excited to emit light of the second color, and the quantum dots of the third color in the first encapsulation part 142B are excited to emit light of the third color. After the light emitted by the second light-emitting unit (including the light of the first color and possibly the light of the second color) enters the corresponding second packaging part, the second color quantum dots in the second packaging part are stimulated to emit the second color light, and the third color quantum dots in the second packaging part are stimulated to emit the third color light. In a specific embodiment, Figure 6As shown, the light emitted by the first light-emitting unit 12B (including the light of the first color, and possibly including the light of the second color) is incident on the corresponding first packaging part 142B; the light incident on the first packaging part 142B excites the quantum dots of the second color in the first packaging part 142B to emit the light of the second color, and excites the quantum dots of the third color in the first packaging part 142B to emit the light of the third color; the scattering particles 422 in the first packaging part 142B scatter the light incident on the first packaging part 142B and the light emitted by the quantum dots 421 in the first packaging part 142B; the light emitted from the first packaging part 142B (the light emitted from the first packaging part 142B is a mixed light of the first color, the second color and the third color) is incident on the corresponding first filter part 15B; the first filter part 15B filters the light incident on the first filter part 15B to allow the light of the first color to pass through. The light emitted by the second light-emitting unit 12G (including the light of the first color, and possibly including the light of the second color) is incident on the corresponding second packaging part 142G; the light incident on the second packaging part 142G excites the quantum dots of the second color in the second packaging part 142G to emit the light of the second color, and excites the quantum dots of the third color in the second packaging part 142G to emit the light of the third color; the scattering particles 422 in the second packaging part 142G scatter the light incident on the second packaging part 142G and the light emitted by the quantum dots 421 in the second packaging part 142G; the light emitted from the second packaging part 142G (the light emitted from the second packaging part 142G is a mixed light of the first color, the second color and the third color) is incident on the corresponding second filter part 15G; the second filter part 15G filters the light incident on the second filter part 15G to allow the light of the second color to pass through. The light emitted by the second light-emitting unit 12R (including the light of the first color, and possibly including the light of the second color) is incident on the corresponding second packaging part 142R; the light incident on the second packaging part 142R excites the quantum dots of the second color in the second packaging part 142R to emit the light of the second color, and excites the quantum dots of the third color in the second packaging part 142R to emit the light of the third color; the scattering particles 422 in the second packaging part 142R scatter the light incident on the second packaging part 142R and the light emitted by the quantum dots 421 in the second packaging part 142R; the light emitted from the second packaging part 142R (the light emitted from the second packaging part 142R is a mixed light of the first color, the second color and the third color) is incident on the corresponding third filter part 15R; the third filter part 15R filters the light incident on the third filter part 15R to allow the light of the third color to pass through.Thus, the first color (e.g., blue) light is emitted from the first filter section 15B, the second color (e.g., green) light is emitted from the second filter section 15G, and the third color (e.g., red) light is emitted from the third filter section 15R, and the display substrate 200 can achieve full-color display. In a specific embodiment, the display substrate 200 includes a plurality of sub-pixels arranged in an array, and the plurality of sub-pixels include sub-pixels of a first color, sub-pixels of a second color, and sub-pixels of a third color. The sub-pixel of the first color includes a first light-emitting unit 12B, a first packaging section 142B corresponding to the first light-emitting unit 12B, and a first filter section 15B corresponding to the first light-emitting unit 12B. The sub-pixel of the second color includes a second light-emitting unit 12G, a second packaging section 142G corresponding to the second light-emitting unit 12G, and a second filter section 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 unit 142R corresponding to the second light emitting unit 12R, and a third filter unit 15R corresponding to the second light emitting unit 12R. Since the light of the first color is emitted from the first filter unit 15B, the light of the second color is emitted from the second filter unit 15G, and the light of the third color is emitted from the third filter unit 15R, the display substrate 200 can realize that the sub-pixel of the first color displays the first color, the sub-pixel of the second color displays the second color, and the sub-pixel of the third color displays the third color.

[0100] Please refer to Figure 7 , which shows a cross-sectional view of yet another display substrate 300 provided in an embodiment of the present application. Figure 7 The front view of the display substrate 300 is shown in FIG. Figure 1 Similar, I will not go into details here. Figure 7 ,and Figure 2 The display substrate 100 shown is different in that Figure 7 In the display substrate 300 shown, 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.

[0101] In an optional embodiment, Figure 7 In the display substrate 300 shown, all the defining portions in the pixel defining 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 range of the height of all the defining portions in the pixel defining layer 13 is [8 μm, 13 μm], and the height of all the defining portions in the pixel defining layer 13 is the same.

[0102] In an optional embodiment, Figure 7 In the display substrate 300 shown, 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 the first color. The first light-emitting unit 12B and the second light-emitting unit can also be used to emit light of the second color. The quantum dots 421 in the second packaging part 142G are quantum dots of the second color, and the quantum dots 421 in the second packaging part 142R are quantum dots of the third color. After the light emitted by the second light-emitting unit 12G (including light of the first color, and may also include light of the second color) is incident on the corresponding second packaging part 142G, the quantum dots 421 in the second packaging part 142G are stimulated 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 may also include light of the second color) is incident on the corresponding second packaging part 142R, the quantum dots 421 in the second packaging part 142R are stimulated to emit light of the third color. In a specific embodiment, as Figure 7As shown, the light emitted by the first light-emitting unit 12B (including the light of the first color and possibly including the light of the second color) is incident on the corresponding first packaging part 142B; the scattering particles 422 in the first packaging part 142B scatter the light incident on the first packaging part 142B; the light emitted from the first packaging part 142B is incident on the corresponding first filter part 15B; the first filter part 15B filters the light incident on 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 the light of the first color and possibly including the light of the second color) is incident on the corresponding second packaging part 142G; the light incident on the second packaging part 142G excites the quantum dots 421 in the second packaging part 142G to emit the light of the second color; the scattering particles 422 in the second packaging part 142G scatter the light incident on the second packaging part 142G and the light emitted by the quantum dots 421 in the second packaging part 142G; the light emitted from the second packaging part 142G (the light emitted from the second packaging part 142G is a mixed light of the light of the first color and the light of the second color) is incident on the corresponding second filtering part 15G; the second filtering part 15G filters the light incident on the second filtering part 15G to allow the light of the second color to pass through. The light emitted by the second light-emitting unit 12R (including the light of the first color, and may also include the light of the second color) is incident on the corresponding second packaging part 142R; the light incident on the second packaging part 142R excites the quantum dots 421 in the second packaging part 142R to emit light of a third color; the scattering particles 422 in the second packaging part 142R scatter the light incident on the second packaging part 142R and the light emitted by the quantum dots 421 in the second packaging part 142R; the light emitted from the second packaging part 142R (the light emitted from the second packaging part 142R includes the light of the first color and the light of the third color, and may also include the light of the second color) is incident on the corresponding third filtering part 15R; the third filtering part 15R filters the light incident on the third filtering part 15R to allow the light of the third color to pass through. Thus, the first color (e.g., blue) light is emitted from the first filter section 15B, the second color (e.g., green) light is emitted from the second filter section 15G, and the third color (e.g., red) light is emitted from the third filter section 15R, and the display substrate 300 can achieve full-color display. In a specific embodiment, the display substrate 300 includes a plurality of sub-pixels arranged in an array, and the plurality of sub-pixels include sub-pixels of a first color, sub-pixels of a second color, and sub-pixels of a third color. The sub-pixels of the first color include a first light-emitting unit 12B, a first encapsulation unit 142B corresponding to the first light-emitting unit 12B, and a first filter section 15B corresponding to the first light-emitting unit 12B.The sub-pixel of the second color includes a second light-emitting unit 12G, a second encapsulation portion 142G corresponding to the second light-emitting unit 12G, and a second filter portion 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 the light of the first color is emitted from the first filter portion 15B, the light of the second color is emitted from the second filter portion 15G, and the light of the third color is emitted from the third filter portion 15R, the display substrate 300 can realize that the sub-pixel of the first color displays the first color, the sub-pixel of the second color displays the second color, and the sub-pixel of the third color displays the third color.

[0103] It should be noted that, in the display substrate 200 and the 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. Figure 6 and Figure 7 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. For other descriptions of the display substrate 200 and the display substrate 300, please refer to the relevant description of the display substrate 100, which will not be repeated here.

[0104] It should be noted that, since in the display substrate 200, the first encapsulation part and the second encapsulation part are an integrated structure, and the plurality of second encapsulation parts are an integrated structure, the first encapsulation part and the second encapsulation part can be manufactured by the same process, which can simplify the process flow of manufacturing the first encapsulation part and the second encapsulation part, reduce the process difficulty of manufacturing the first encapsulation part and the second encapsulation part, and thus reduce the process difficulty of manufacturing the display substrate 200. Since in the display substrate 100 and the display substrate 300, the first encapsulation part 142B does not include quantum dots, and therefore, the first encapsulation part 142B does not perform light conversion, and the first encapsulation part 142B consumes less light of the first color emitted by the first light-emitting unit 12B, so that more light of the first color is emitted from the first encapsulation part 142B, and further, more light of the first color is emitted from the first filter part 142B, and the display substrate 100 and the display substrate 300 have a higher light extraction efficiency for the light of the first color. Since in the display substrate 300, the second packaging part 142G includes quantum dots of the second color but does not include quantum dots of the third color, the distribution density of the quantum dots of the second color in the second packaging part 142G can be set to be relatively large, so that the quantum dots of the second color in the second packaging part 142G can convert most of the light of the first color emitted by the second light-emitting unit 12G into light of the second color. The second packaging part 142G has a high conversion efficiency for the light of the first color emitted by the second light-emitting unit 12G, and more light of the second color is emitted from the second packaging part 142G. Furthermore, more light of the second color is emitted from the second filtering part 142G, and the display substrate 300 has a high light extraction efficiency for the light of the second color. Since in the display substrate 300, the second packaging part 142R includes quantum dots of the third color but does not include quantum dots of the second color, the distribution density of the quantum dots of the third color in the second packaging part 142R can be set to be relatively large, so that the quantum dots of the third color in the second packaging part 142R can convert most of the light of the first color emitted by the second light-emitting unit 12R into light of the third color. The second packaging part 142R has a high conversion efficiency for the light of the first color emitted by the second light-emitting unit 12R, and more light of the third color is emitted from the second packaging part 142R. Furthermore, more light of the third color is emitted from the second filtering part 142R, and the display substrate 300 has a high light extraction efficiency for the light of the third color.

[0105] The above is an introduction to the display substrate provided in the embodiment of the present application. The following is an introduction to the manufacturing method of the display substrate provided in the embodiment of the present application.

[0106] Please refer to Figure 8 , which shows a flow chart of a method for manufacturing a display substrate provided in an embodiment of the present application. The manufacturing method can be used to manufacture Figure 2 The display substrate 100 is shown. Figure 8 , the manufacturing method includes the following steps S801 to S803.

[0107] S801. Provide a substrate.

[0108] The substrate substrate may be a rigid substrate made of a light-conducting and non-metallic transparent material with a certain degree of rigidity, such as glass or quartz, for example, the substrate substrate is a glass substrate. Alternatively, the substrate substrate may be a flexible substrate made of a flexible material such as PI. In the case where the substrate substrate is a flexible substrate, the substrate substrate may be provided via a rigid substrate (that is, the substrate substrate is provided by being disposed on a rigid substrate).

[0109] S802. A light-emitting device layer and a pixel defining layer are formed on the base 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.

[0110] In a specific embodiment, the light-emitting device layer includes a plurality of light-emitting units, and the plurality of light-emitting units include a plurality of first light-emitting units and a plurality of second light-emitting units. The pixel defining layer includes a plurality of pixel openings and defining portions for defining the plurality of pixel openings, and the plurality of pixel openings include a plurality of first pixel openings and a plurality of second pixel openings, the defining portion for defining the first pixel opening is the first defining portion, the defining portion for defining the second pixel opening is the second defining portion, the defining portion shared by the first pixel opening and the second pixel opening is the first defining portion, and the height of the first defining portion is greater than the height of the second defining portion. The plurality of light-emitting units are located in the plurality of pixel openings in a one-to-one correspondence, and the plurality of first light-emitting units are located in the plurality of first pixel openings in a one-to-one correspondence, and the plurality of second light-emitting units are located in the plurality of second pixel openings in a one-to-one correspondence.

[0111] Wherein, each of the multiple light-emitting units (including 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. Therefore, forming a light-emitting device layer on a substrate substrate includes: forming a stacked first electrode, a light-emitting functional layer, and a second electrode on the substrate substrate. The first electrodes of different light-emitting units among the multiple light-emitting units may be independent of each other. Different light-emitting units among the multiple light-emitting units may share a second electrode. The light-emitting functional layer of the first light-emitting unit may be independent of the light-emitting functional layer of the second light-emitting unit, and / or the light-emitting functional layers of different second light-emitting units may 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 light-emitting functional layer. For example, the multiple light-emitting units share a light-emitting functional layer.

[0112] The embodiment of the present application is described by taking the example that the multiple light-emitting units share the light-emitting functional layer and the second electrode, and the first electrodes of different light-emitting units in the multiple light-emitting units are independent of each other.

[0113] Please refer to Fig. 9 , which shows a schematic diagram of a plurality of first electrodes 121 formed on a substrate 11 according to an embodiment of the present application. The material of the first electrode 121 may be a metal material, including but not limited to metal Mo (molybdenum), metal Cu (copper), metal Al (aluminum) and alloy materials thereof.

[0114] In an optional embodiment, a layer of metal material is deposited on the substrate 11 to obtain a metal material layer, and the metal material layer is processed by a patterning process to obtain the first electrode 121. The process of depositing the metal material includes but is not limited to magnetron sputtering, thermal evaporation or plasma enhanced chemical vapor deposition (PECVD).

[0115] After forming the first electrode 121 on the base substrate 11, please refer to Fig.10 , a pixel defining layer 13 is formed on the base substrate 11. The pixel defining layer 13 includes a plurality of pixel openings and defining portions for defining the plurality of pixel openings, and a plurality of first electrodes 121 are located in the plurality of pixel openings in a one-to-one correspondence. The plurality of pixel openings include 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, and the height of the first defining portion 131 is greater than the height of the second defining portion 132. The adjacent first pixel opening K1 and the second pixel opening K2 share a defining portion, and the defining portion shared by the first pixel opening K1 and the second pixel opening K2 is the first defining portion 131.

[0116] The material of the pixel defining layer 13 may include an organic material such as an organic resin, or the material of the pixel defining layer 13 may include an inorganic material such as SiOx, SiNx, aluminum oxide (Al2O3) or SiOxNy. In the embodiment of the present application, the pixel defining layer 13 may be formed by two patterning processes or by one patterning process. The material of the pixel defining layer 13 is SiOx as an example.

[0117] In one embodiment, the pixel defining layer 13 is formed by two patterning processes. One of the two patterning processes is used to form the second defining portion 132, and the other patterning process is used to form the first defining portion 131. In a specific embodiment, first, a layer of SiOx is deposited on the base substrate 11 formed with the first electrode 121 to obtain a first SiOx material layer, and the first SiOx material layer is processed by a patterning process to obtain the second defining portion 132. Then, a layer of SiOx is deposited on the base substrate 11 formed with the first electrode 121 and the second defining portion 132 to obtain a second SiOx material layer, and the second SiOx material layer is processed by a 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 3μm, and the thickness of the second SiOx material layer is in the range of [8μm, 13μm], thereby making the height of the second defining portion 132 less than or equal to 3μm, and the height of the first defining portion 131 is in the range of [8μm, 13μm]. Here, it is taken as an example that the second defining portion 132 is formed first and the first defining portion 131 is formed later. In other embodiments, the first defining portion 131 is formed first and the second defining portion 132 is formed later. The embodiment of the present application does not limit the order of forming the first defining portion 131 and the second defining portion 132.

[0118] In another embodiment, the pixel defining layer 13 is formed by two patterning processes. One of the two patterning processes is used to form the second defining portion 132 and the initial defining portion for defining the first pixel opening, and the other patterning process is used to heighten the initial defining portion to obtain the first defining portion 131. In a specific embodiment, first, a layer of SiOx is deposited on the base substrate 11 formed with the first electrode 121 to obtain a first SiOx material layer, and the first SiOx material layer is processed by a patterning process to obtain the second defining portion 132 and the initial defining portion for defining the first pixel opening, and the height of the initial defining portion is equal to the height of the second defining portion 132. Then, a layer of SiOx is deposited on the base substrate 11 formed with the first electrode 121, the second limiting portion 132 and the initial limiting portion to obtain a second SiOx material layer, and 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 achieving the heightening of the initial limiting portion, and the heightened 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 3μm, and the thickness of the second SiOx material layer is in the range of [5μm, 10μm], thereby making the height of the second limiting portion 132 and the height of the initial limiting portion less than or equal to 3μm, and the height of the heightened initial limiting portion (that is, the first limiting portion 131) is in the range of [8μm, 13μm].

[0119] In another embodiment, the pixel defining layer 13 is formed by a single patterning process. In the single patterning process, the mask used for exposure is a grayscale mask, which includes a completely light-transmitting area corresponding to the pixel opening (including the first pixel opening and the second pixel opening), a non-completely light-transmitting area corresponding to the second defining portion 132, and a light-shielding area corresponding to the first defining portion 131. In a specific embodiment, a layer of SiOx is deposited on the substrate 11 on which the first electrode 121 is formed to obtain a SiOx material layer. A layer of photoresist is coated on the SiOx material layer to obtain a photoresist layer. The grayscale mask is used to expose the photoresist layer, so that the photoresist layer forms a completely exposed area, a non-completely exposed area, and a non-exposed area, the completely exposed area corresponds to the completely light-transmitting area of ​​the grayscale mask, the non-completely exposed area corresponds to the non-completely light-transmitting area of ​​the grayscale mask, and the non-exposed area corresponds to the light-shielding area of ​​the grayscale mask. The exposed photoresist layer is developed to obtain a photoresist pattern, wherein the photoresist pattern includes a first photoresist area, a second photoresist area and a photoresist completely removed area, wherein the first photoresist area is the non-exposed area, the second photoresist area corresponds to the non-completely exposed area, the thickness of the second photoresist area is less than the thickness of the first photoresist area, and the photoresist completely removed area corresponds to the completely exposed area. The corresponding area of ​​the photoresist completely removed area on the SiOx material layer is etched to form a pixel opening on the SiOx material layer. After the pixel opening is formed on the SiOx material layer, the photoresist pattern is processed by an ashing process to remove the photoresist in the second photoresist area. Afterwards, the corresponding area of ​​the second photoresist area on the SiOx material layer is half-etched to obtain the second limiting portion 132. Finally, the photoresist in the first photoresist area is removed to obtain the first limiting portion 131. In this embodiment, the thickness of the SiOx material layer is in the range of [8μm, 13μm], and the corresponding area of ​​the second photoresist area on the SiOx material layer is half-etched to reduce the thickness of the area to less than or equal to 3μm, so that the height of the second limiting portion 132 is less than or equal to 3μm, and the height of the first limiting portion 131 is in the range of [8μm, 13μm].

[0120] After forming the pixel defining layer 13, please refer to Fig.11 A light-emitting functional layer 122 is formed on the base substrate 11 formed with the pixel defining layer 13. Part 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.

[0121] In one embodiment, if Figure 3As shown, the light-emitting functional layer 122 includes a stacked hole transport layer 1221, a light-emitting layer 1222 and an electron transport layer 1223. The light-emitting functional layer 122 is formed on the base substrate 11 on which the first electrode 121 and the pixel defining layer 13 are formed, including: sequentially forming a hole transport layer 1221, a light-emitting layer 1222 and an electron transport layer 1223 on the base substrate 11 on which the first electrode 121 and the pixel defining layer 13 are formed.

[0122] In another embodiment, if Figure 4 As shown, the light-emitting functional layer 122 includes a stacked hole transport layer 1221, a light-emitting layer 1222, a charge generation layer 1223, a light-emitting layer 1224, and an electron transport layer 1225. The light-emitting functional layer 122 is formed on the base substrate 11 on which the first electrode 121 and the pixel defining layer 13 are formed, including: forming a hole transport layer 1221, a light-emitting layer 1222, a charge generation layer 1223, a light-emitting layer 1224, and an electron transport layer 1225 in sequence on the base substrate 11 on which the first electrode 121 and the pixel defining layer 13 are formed.

[0123] In another embodiment, Figure 5 As shown, the light-emitting functional layer 122 includes a stacked hole transport layer 1221, a light-emitting layer 1222, a charge generation layer 1223, a light-emitting layer 1224, a charge generation layer 1225, a light-emitting layer 1226, and an electron transport layer 1227. The light-emitting functional layer 122 is formed on the base substrate 11 on which the first electrode 121 and the pixel defining layer 13 are formed, including: forming a hole transport layer 1221, a light-emitting layer 1222, a charge generation layer 1223, a light-emitting layer 1224, a charge generation layer 1225, a light-emitting layer 1226, and an electron transport layer 1227 in sequence on the base substrate 11 on which the first electrode 121 and the pixel defining layer 13 are formed.

[0124] In the embodiment of the present application, the light-emitting functional layer 122 may be formed by an evaporation process.

[0125] The embodiment of the present application takes a plurality of light-emitting units sharing a light-emitting functional layer 122 as an example. In other embodiments, the light-emitting functional layers 122 of different light-emitting units in the plurality of light-emitting units are independent of each other, and at least two light-emitting units in the plurality of light-emitting units have different light-emitting functional layers 122. In this case, the light-emitting functional layers 122 with the same structure can be prepared at the same time, and the embodiment of the present application does not limit this.

[0126] After forming the light-emitting functional layer 122, please refer to Fig.12, a second electrode 123 is formed on the side of the light-emitting functional layer 122 away from the base 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 in sequence 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 in sequence 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 in sequence to form a second light-emitting unit.

[0127] The material of the second electrode 123 is a transparent conductive material, including but not limited to metal oxides such as indium tin oxide (ITO), indium zinc oxide (IZO) or aluminum-doped zinc oxide (ZnO:Al). Taking the material of the second electrode 123 as ITO as an example, a layer of ITO is deposited on the side of the light-emitting functional layer 122 away from the base substrate 11 as the second electrode 123. The process of depositing ITO includes but is not limited to magnetron sputtering, thermal evaporation or PECVD.

[0128] The embodiment of the present application takes the example of multiple light-emitting units sharing the 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 through a single patterning process to obtain multiple second electrodes 123.

[0129] In an optional embodiment, if Figures 9 to 12 As shown, there is a circuit layer 18 between the base 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 base substrate 11 (that is, before S802), the circuit layer 18 is formed on the base substrate 11. The circuit layer 18 includes a switch unit 181 corresponding to each light-emitting unit in the light-emitting device layer 12, and the switch unit 181 corresponding to each light-emitting unit is electrically connected to the light-emitting unit. Specifically, after the light-emitting device layer 12 is formed on the base substrate 11, the first electrode 121 in each light-emitting unit is electrically connected to the switch unit 181 corresponding to the light-emitting unit.

[0130] S803. Form a packaging structure layer on the side of the light-emitting device layer away from the base substrate, the packaging structure layer includes a first packaging part corresponding to the first light-emitting unit and a second packaging part corresponding to the second light-emitting unit, the first packaging part includes scattering particles, and the second packaging part includes quantum dots and scattering particles.

[0131] 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, the plurality of first light-emitting units are located in the plurality of first pixel openings in a one-to-one correspondence, and the plurality of second light-emitting units are located in the plurality of second pixel openings in a one-to-one correspondence. The encapsulation structure layer includes a plurality of first encapsulation parts corresponding to the plurality of first light-emitting units and a plurality of second encapsulation parts corresponding to the plurality of second light-emitting units in a one-to-one correspondence, the plurality of first encapsulation parts are located in the plurality of first pixel openings in a one-to-one correspondence, and the plurality of second encapsulation parts are located in the plurality of second pixel openings in a one-to-one correspondence. In each first pixel opening, the first encapsulation part is stacked with the first light-emitting unit. In each second pixel opening, the second encapsulation part is stacked with the second light-emitting unit. Each first encapsulation part includes scattering particles, and each second encapsulation part includes quantum dots and scattering particles.

[0132] In an optional embodiment, the plurality of second packaging parts are an integrated structure, the first packaging part and the second packaging part may be independent of each other, and any two first packaging parts among the plurality of first packaging parts are independent of each other.

[0133] Wherein, the first light-emitting unit and the second light-emitting unit are both used to emit light of the first color, and the quantum dots in the second packaging part include quantum dots of the second color and quantum dots of the third color. The quantum dots of the second color are used to emit light of the second color under the excitation of the light of the first color. The quantum dots of the third color are used to emit light of the third color under the excitation of the light of the first color. In an optional embodiment, the second light-emitting unit is also used to emit light of the second color, and the quantum dots of the third color are also used to emit light of the third color under the excitation of the light of the second color. The first light-emitting unit is also used to emit light of the second color.

[0134] 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 in sequence, and the organic encapsulation layer includes a first encapsulation portion and a second encapsulation portion. The encapsulation structure layer is formed on a side of the light-emitting device layer away from the substrate, including: forming a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in sequence on a side of the light-emitting device layer away from the substrate.

[0135] Please refer to Fig.13 , which shows a schematic diagram of an embodiment of the present application after a first inorganic encapsulation layer 141 is formed on a side of the light-emitting device layer 12 away from the base substrate 11. The orthographic projection of the first inorganic encapsulation layer 141 on the base substrate 11 covers the orthographic projection of the light-emitting device layer 12 on the base substrate 11.

[0136] The material of the first inorganic encapsulation layer 141 is an inorganic material, including but not limited to one or more combinations of SiOx, SiNx or SiOxNy. Take the material of the first inorganic encapsulation layer 141 as SiOx as an example. 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 of depositing SiOx includes but is not limited to magnetron sputtering, thermal evaporation or PECVD.

[0137] After forming the first inorganic encapsulation layer 141 on the side of the light emitting device layer 12 away from the base substrate 11, please refer to Fig.14 , an organic encapsulation layer 142 is formed on the side of the first inorganic encapsulation layer 141 away from the base 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 part 142B and a second encapsulation part (including a second encapsulation part 142G and a second encapsulation part 142R). The first encapsulation part 142B is located in the first pixel opening, and each second encapsulation part is located in a second pixel opening. The second encapsulation part 142G and the second encapsulation part 142R are an integral structure. The first encapsulation part 142B includes scattering particles 422, and the second encapsulation part 142G and the second encapsulation part 142R both include quantum dots 421 and scattering particles 422, and the quantum dots 421 include quantum dots of the second color and quantum dots of the third color.

[0138] The material of the organic encapsulation layer 142 is an organic material, including but not limited to an organic resin. For example, the material of the first encapsulation part 142B is a methyl methacrylate solution doped with scattering particles, and the material of the second encapsulation part 142B is 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 base substrate 11 by inkjet printing.

[0139] In a specific embodiment, an organic encapsulation layer 142 is formed on a side of the first inorganic encapsulation layer 141 away from the base substrate 11, including: printing a methyl methacrylate solution doped with scattering particles 422 in the first pixel opening, and curing the printed methyl methacrylate solution to form a first encapsulation portion 142B in the first pixel opening. Printing a methyl methacrylate solution doped with second color quantum dots 421, third color quantum dots 421, and scattering particles in the second pixel opening, and curing the printed methyl methacrylate solution to form a second encapsulation portion in the second pixel opening.

[0140] After the organic encapsulation layer 142 is formed on the side of the first inorganic encapsulation layer 141 away from the base substrate 11, please refer to Fig.15A second inorganic encapsulation layer 143 is formed on the side of the organic encapsulation layer 142 away from the base 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 base substrate 11 covers the orthographic projection of the organic encapsulation layer 142 on the base substrate 11.

[0141] The material of the second inorganic encapsulation layer 143 is an inorganic material, including but not limited to one or more combinations of SiOx, SiNx or SiOxNy. Take the material of the second inorganic encapsulation layer 143 as SiOx as an example. 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 of depositing SiOx includes but is not limited to magnetron sputtering, thermal evaporation or PECVD.

[0142] The embodiment of the present application takes the encapsulation structure layer 14 including two inorganic encapsulation layers and one organic encapsulation layer as an example. In other embodiments, the encapsulation structure layer includes multiple inorganic encapsulation layers and multiple organic encapsulation layers, and the inorganic encapsulation layers and the organic encapsulation layers are alternately stacked. Correspondingly, the encapsulation structure layer is formed on the side of the light-emitting device layer away from the substrate substrate, including: inorganic encapsulation layers and organic encapsulation layers alternately stacked on the side of the light-emitting device layer away from the substrate 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 stacked in sequence on the side of the light-emitting device layer away from the substrate substrate. In this case, at least one organic encapsulation layer includes a first encapsulation portion and a second encapsulation portion.

[0143] In an optional embodiment, after the encapsulation structure layer 14 is formed on the side of the light emitting device layer 12 away from the base substrate 11. Fig.16 A black matrix pattern 16 is formed on the side of the encapsulation structure layer 14 away from the base 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 to a plurality of light-emitting units in the light-emitting device layer 12, and the orthographic projection of each light-emitting unit on the base substrate 11 is located within the orthographic projection of the corresponding black matrix opening on the base substrate 11.

[0144] After the black matrix pattern 16 is formed on the side of the packaging structure layer 14 away from the base substrate 11, please refer to Fig.17A color filter layer 15 is formed on the side of the packaging structure layer 14 away from the base substrate 11. 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). The plurality of filter portions are located in a plurality of black matrix openings of the black matrix pattern 16 in a one-to-one correspondence. The light shielding portion 161 between any two black matrix openings is used to shield the filter portions in the any two black matrix openings to prevent crosstalk of light emitted from the filter portions in the any two black matrix openings.

[0145] In an optional embodiment, after the color filter layer 15 is formed on the side of the encapsulation structure layer 14 away from the base substrate 11, a protective layer 17 is formed on the side of the color filter layer 15 away from the base substrate 11. A schematic diagram of the color filter layer 15 after the protective layer 17 is formed on the side of the color filter layer 15 away from the base substrate 11 is shown in FIG. Figure 2 The protective layer 17 is used to protect the color filter layer 15. The protective layer 17 may also be called an OC layer or a leveling layer.

[0146] In summary, in the display substrate manufactured by the manufacturing method provided in the embodiment of the present application, the light-emitting device layer includes a first light-emitting unit and a second light-emitting unit, and 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 quantum dots in the second encapsulation part are used to emit light under the excitation of the light emitted by the second light-emitting unit, so the second encapsulation part can realize light conversion, such as light color conversion. The encapsulation structure layer can encapsulate the light-emitting device layer on the one hand, and can be used as a CCP to convert the light emitted by the light-emitting unit on the other hand. As a result, the optical path from the light-emitting device layer to the CCP (that is, the encapsulation structure layer in the embodiment of the present application) is short, and the light emitted by the light-emitting device layer reaches the encapsulation structure layer and also reaches the CCP. The light emitted by the light-emitting device layer has less loss in the process of reaching the CCP, which helps to improve the light extraction efficiency of the display substrate. In addition, since the encapsulation structure layer can be used as a CCP to convert the light emitted by the light-emitting unit, there is no need to set up a CCP additionally, which can save the process of manufacturing the CCP and simplify the manufacturing process flow of the display substrate.

[0147] In addition, the first packaging part and the second packaging part also include scattering particles, respectively. The scattering particles in the first packaging part can scatter the light emitted by the first light-emitting unit, and the scattering particles in the second packaging part can scatter the light emitted by the second light-emitting unit and the light emitted by the quantum dots in the second packaging part, thereby improving the uniformity of the light output of the display substrate and avoiding color deviation of the display substrate.

[0148] Figure 8 The embodiment shown is manufactured by Figure 2 The display substrate 100 shown is taken as an example. Figure 6The manufacturing method of the display substrate 200 shown in FIG. Figure 7 The manufacturing method of the display substrate 300 shown in FIG. Figure 8 Embodiment shown. 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 in the process of forming the organic encapsulation layer 142, a methyl methacrylate solution doped with the second color quantum dots 421, the third color quantum dots 421 and the 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, and in the process of forming the organic encapsulation layer 142, a methyl methacrylate solution doped with the scattering particles 422 is printed in the first pixel opening, a methyl methacrylate solution doped with the scattering particles 422 and the second color quantum dots 421 is printed in the second pixel opening where the second light emitting unit 12G is located, and a methyl methacrylate solution doped with the scattering particles 422 and the third color quantum dots 421 is printed in the second pixel opening where the second light emitting unit 12R is located.

[0149] The remaining manufacturing process of the display substrate 200 and the remaining manufacturing process of the display substrate 300 can refer to Figure 8 The illustrated embodiments are not described in detail here.

[0150] In the manufacturing method of the display substrate provided in the embodiment of the present application, the one-time patterning process involved may include photoresist coating, exposure, development, etching and photoresist stripping. Processing the material layer (e.g., metal material layer) through the one-time patterning process may include: coating a layer of photoresist on the material layer (e.g., metal material layer) to obtain a photoresist layer, exposing the photoresist layer using a mask plate so that the photoresist layer forms a completely exposed area and a non-exposed area, and then using a development process to completely remove the photoresist in the completely exposed area, and retain all the photoresist in the non-exposed area, and etching the area corresponding to the completely exposed area on the material layer (e.g., metal material layer) using an etching process, and finally stripping the photoresist in the non-exposed area to obtain a corresponding structure (e.g., the first electrode 121). It is easy to understand that the photoresist is a positive photoresist as an example for explanation here. In the case where the photoresist is a negative photoresist, the process of the one-time patterning process can refer to the description of this paragraph, and the embodiment of the present application will not be repeated here.

[0151] Based on the same inventive concept, an embodiment of the present application provides a display device, which includes the display substrate 100, the display substrate 200 or the display substrate 300 provided in the above embodiment. The display device can be any product or component with a display function, such as a display screen, electronic paper, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator or a wearable device.

[0152] The term "at least one" in this application refers to one or more, and "plurality" refers to two or more. In addition, in order to facilitate clear description, in this application, the words "first", "second", "third" and the like are used to distinguish the same items or similar items with substantially the same functions and effects. Those skilled in the art will understand that the words "first", "second", "third" and the like do not limit the quantity and execution order.

[0153] The embodiments of the display substrate and the manufacturing method of the display substrate provided in the embodiments of the present application can refer to each other, and the embodiments of the present application are not limited to this. The order of operations of the method embodiments provided in the embodiments of the present application can be appropriately adjusted, and the operations can also be increased or decreased in response to the situation. Any technician familiar with the technical field can easily think of the change method within the technical scope disclosed in the present application, which should be included in the protection scope of the present application, so it will not be repeated.

[0154] The above is only an exemplary embodiment of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A display substrate, characterized in that: include: substrate substrate; A light emitting device layer, located on the base substrate, comprises a first light emitting unit and a second light emitting unit; a pixel defining layer, located on the base substrate, 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 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 packaging structure layer is located on the side of the light-emitting device layer away from the base substrate, and includes a first packaging part corresponding to the first light-emitting unit and a second packaging part corresponding to the second light-emitting unit, the first packaging part includes scattering particles, and the second packaging part includes quantum dots and scattering particles.

2. The display substrate according to claim 1, characterized in that: The first encapsulation portion is located in the first pixel opening, and the second encapsulation portion 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, the pixel defining layer includes a plurality of second pixel openings, and the plurality of second light emitting units are located in the plurality of second pixel openings in a one-to-one correspondence; The packaging structure layer includes a plurality of second packaging parts corresponding to the plurality of second light-emitting units one by one, the plurality of second packaging parts are an integrated structure, and the first packaging part and the second packaging 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, and the organic encapsulation layer includes the first encapsulation part and the second encapsulation part.

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, and the first inorganic encapsulation layer, the organic encapsulation layer and the second inorganic encapsulation layer are stacked in sequence.

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

7. The display substrate according to any one of claims 1 to 6, characterized in that: The first light-emitting unit and the second light-emitting unit are both used to emit light of a first color, and the quantum dots in the second packaging 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 under the excitation of the light of the first color; The quantum dots of the third color are used to emit the light of the third color under the excitation of the light of the first color.

8. The display substrate according to claim 7, characterized in that: 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 under the excitation of 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 a plurality of stacked light-emitting layers, and the light-emitting layer in the first light-emitting unit and the light-emitting layer in the second light-emitting unit are both used for emitting 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 a plurality of stacked light-emitting layers, and 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 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 a side of the packaging structure layer away from the base substrate.

13. A method for manufacturing a display substrate, characterized in that: The method comprises: providing a substrate base plate; A light-emitting device layer and a pixel defining layer are formed on the base substrate, wherein the light-emitting device layer includes a first light-emitting unit and a second light-emitting unit, and 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, wherein 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; A packaging structure layer is formed on a side of the light-emitting device layer away from the base substrate, the packaging structure layer includes a first packaging part corresponding to the first light-emitting unit and a second packaging part corresponding to the second light-emitting unit, the first packaging part includes scattering particles, and the second packaging part includes quantum dots and scattering particles.

14. The method according to claim 13, characterized in that The first encapsulation portion is located in the first pixel opening, and the second encapsulation portion 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, the pixel defining layer includes a plurality of second pixel openings, and the plurality of second light emitting units are located in the plurality of second pixel openings in a one-to-one correspondence; The packaging structure layer includes a plurality of second packaging parts corresponding to the plurality of second light-emitting units one by one, the plurality of second packaging parts are an integrated structure, and the first packaging part and the second packaging part are independent of each other.

16. The method according to claim 14 or 15, characterized in that The step of forming a packaging structure layer on a side of the light emitting device layer away from the substrate includes: An organic encapsulation layer is formed on a side of the light emitting device layer away from the base substrate, wherein the organic encapsulation layer includes the first encapsulation portion and the second encapsulation portion.

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

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

19. The method according to any one of claims 13 to 18, characterized in that The first light-emitting unit and the second light-emitting unit are both used to emit light of a first color, and the quantum dots in the second packaging 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 under the excitation of the light of the first color; The quantum dots of the third color are used to emit the light of the third color under the excitation of the light of the first color.

20. The method according to claim 19, characterized in that 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 under the excitation of 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; A light-emitting device layer is formed on the base substrate, including: the first electrode, the light-emitting functional layer and the second electrode are stacked on the base substrate, the light-emitting functional layer includes one light-emitting layer or multiple stacked light-emitting layers, and 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; A light-emitting device layer is formed on the base substrate, comprising: the first electrode, the light-emitting functional layer and the second electrode are stacked on the base substrate, the light-emitting functional layer in the first light-emitting unit comprises one light-emitting layer or a plurality of 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 comprises 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 a side of the packaging structure layer away from the base substrate.

25. A display device, characterized in that: The display substrate comprises the display substrate as claimed in any one of claims 1 to 12.

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