OLED display substrate, manufacturing method thereof, and display device

Abstract

The present invention provides an OLED display substrate and a manufacturing method thereof, and a display device, which belong to the field of display technology. Among them, the OLED display substrate includes: a driving substrate; a first electrode located on the driving substrate; a pixel defining layer located on the side of the first electrode away from the driving substrate, the pixel defining layer defining a plurality of pixel areas; a light-emitting structure located on the side of the pixel defining layer away from the driving substrate, the light-emitting structure including at least two stacked light-emitting layers, and a charge generation layer located between two adjacent light-emitting layers; a second electrode located on the side of the light-emitting structure away from the driving substrate; an oxygen-releasing structure located between adjacent pixel areas, the oxygen-releasing structure being able to release oxygen ions under the action of an electric field, the oxygen ions entering the charge generation layer causing the charge generation layer to be oxidized. The embodiment of the present invention can improve the problem of lateral leakage between pixels of a display substrate.

Description

Technical Field

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

[0002] OLED (Organic Light-Emitting Diode) display devices have been listed as a next-generation display technology with great development prospects due to their advantages such as thinness, lightness, wide viewing angle, active luminescence, continuously adjustable luminous color, low cost, fast response speed, low energy consumption, low driving voltage, wide operating temperature range, simple production process, high luminous efficiency and flexible display.

[0003] With increasing market requirements for product performance and the demand for diversified products, display devices are required to have higher efficiency, brightness and lifespan. Tandem OLED devices with two or more light-emitting layers have been introduced. Tandem OLED uses CGL (Charge Generation Layer) to connect the upper and lower light-emitting units in series to achieve the effect of superimposed light emission on the device, which can improve important optoelectronic performance indicators such as current efficiency, output brightness, and operating life.

[0004] However, when CGL connects the upper and lower light-emitting units in series, due to its high conductivity, it will cause lateral leakage between the pixels of the OLED device. The lateral leakage causes adjacent pixels to light up, thereby affecting the display effect and reducing the overall display color gamut. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an OLED display substrate and a manufacturing method thereof, and a display device, which can improve the lateral leakage problem between pixels of the display substrate.

[0006] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0007] In one aspect, an OLED display substrate is provided, comprising:

[0008] Driver substrate;

[0009] a first electrode located on the driving substrate;

[0010] a pixel defining layer located on a side of the first electrode away from the driving substrate, the pixel defining layer defining a plurality of pixel areas;

[0011] a light-emitting structure located on a side of the pixel defining layer away from the driving substrate, the light-emitting structure comprising at least two stacked light-emitting layers and a charge generation layer located between two adjacent light-emitting layers;

[0012] a second electrode located on a side of the light emitting structure away from the driving substrate;

[0013] An oxygen-releasing structure is located between adjacent pixel regions, and the oxygen-releasing structure can release oxygen ions under the action of an electric field. The oxygen ions enter the charge generation layer, so that the charge generation layer is oxidized.

[0014] In some embodiments, the oxygen-releasing structure includes an electrically stimulated oxygen-releasing layer and an oxygen-releasing electrode that are stacked, and the electrically stimulated oxygen-releasing layer can release oxygen ions under the action of an electric field.

[0015] In some embodiments, the electrically stimulated oxygen release layer is made of at least one of cerium dioxide, terbium dioxide, and praseodymium dioxide.

[0016] In some embodiments, the oxygen-releasing structure is located between the pixel defining layer and the driving substrate; or

[0017] The pixel defining layer is located on a side away from the driving substrate.

[0018] In some embodiments, the pixel defining layer includes a partition structure disposed between adjacent pixel regions, and undercut structures are formed on two side surfaces of the partition structure.

[0019] In some embodiments, the orthographic projection of the oxygen-releasing structure on the driving substrate is located within the orthographic projection of the partition structure on the driving substrate.

[0020] In some embodiments, the second electrode is made of at least one of magnesium-silver alloy, aluminum-silver alloy, copper-silver alloy, magnesium-aluminum-silver alloy, magnesium-copper-silver alloy, aluminum-copper-silver alloy and magnesium-aluminum-copper-silver alloy.

[0021] An embodiment of the present invention further provides a display device, comprising the OLED display substrate described above.

[0022] An embodiment of the present invention further provides a method for manufacturing an OLED display substrate, comprising:

[0023] forming a driving substrate;

[0024] forming a first electrode on the driving substrate;

[0025] forming a pixel defining layer on a side of the first electrode away from the driving substrate, wherein the pixel defining layer defines a plurality of pixel areas;

[0026] forming a light-emitting structure on a side of the pixel defining layer away from the driving substrate, the light-emitting structure comprising at least two stacked light-emitting layers and a charge generation layer located between two adjacent light-emitting layers;

[0027] forming a second electrode on a side of the light emitting structure away from the driving substrate;

[0028] An oxygen-releasing structure is formed between adjacent pixel regions. The oxygen-releasing structure can release oxygen ions under the action of an electric field. The oxygen ions enter the charge generation layer, causing the charge generation layer to be oxidized.

[0029] In some embodiments, the oxygen-releasing structure includes an electrically excited oxygen-releasing layer and an oxygen-releasing electrode stacked together, and forming the oxygen-releasing structure further includes:

[0030] applying a high level voltage to the oxygen-releasing electrode;

[0031] applying a low-level voltage to the second electrode;

[0032] Under the action of the electric field between the oxygen-releasing electrode and the second electrode, the oxygen ions in the electrically stimulated oxygen-releasing layer migrate into the charge-generating layer, causing oxidation of the charge-generating layer.

[0033] The embodiments of the present invention have the following beneficial effects:

[0034] In the above solution, an oxygen-releasing structure is positioned between adjacent pixel regions. Under the action of an electric field, the oxygen-releasing structure releases oxygen ions. These oxygen ions enter the charge generation layer and react with it, oxidizing it to form a metal oxide. This increases the resistance of the charge generation layer, thereby blocking leakage between pixels and preventing lateral leakage that could cause adjacent pixels to illuminate. This improves the display quality and increases the display color gamut of the display device. Because the oxygen-releasing structure is located between adjacent pixel regions, the oxygen ions released by the oxygen-releasing structure do not oxidize the electrodes in the pixel regions, nor do they affect the pixel regions, thereby not affecting the performance of the display substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural diagram of an existing OLED display substrate;

[0036] Figure 2-Figure 4 This is a schematic structural diagram of an OLED display substrate according to an embodiment of the present invention;

[0037] Figure 5 Schematic diagram of manufacturing an OLED display substrate according to an embodiment of the present invention.

[0038] Reference numerals

[0039] 100 driver substrate

[0040] 200 first electrode

[0041] 201 oxygen release electrode

[0042] 300 pixel defined layer

[0043] 301 partition structure

[0044] 302 Electro-stimulated Oxygen Release Layer

[0045] 401 First Light Emitting Layer

[0046] 402 charge generation layer

[0047] 403 Second light-emitting layer

[0048] 500 Second Electrode DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, they will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] Figure 1 It is a structural diagram of an existing OLED display substrate, such as Figure 1 As shown, the OLED display substrate includes a driving substrate 100, a first electrode 200 located on the driving substrate 100, a pixel defining layer 300 located on the side of the first electrode 200 away from the driving substrate 100, a first light-emitting layer 401 and a second light-emitting layer 403 located on the side of the pixel defining layer 300 away from the driving substrate 100, a charge generation layer 402 located between the first light-emitting layer 401 and the second light-emitting layer 403, and a second electrode 500 located on the side of the second light-emitting layer 403 away from the driving substrate 100. Among them, the charge generation layer 402 is connected in series with the first light-emitting layer 401 and the second light-emitting layer 403 to achieve the effect of light superposition, which can improve important optoelectronic performance indicators of the display substrate, such as current efficiency, output brightness, and operating life. However, due to the high conductivity of the charge generation layer 402, lateral leakage between pixels of the display substrate will occur.

[0051] Embodiments of the present invention provide an OLED display substrate and a manufacturing method thereof, and a display device, which can improve the lateral leakage problem between pixels of the display substrate.

[0052] An embodiment of the present invention provides an OLED display substrate, such as Figure 2-Figure 4 Shown, including:

[0053] a driving substrate 100;

[0054] a first electrode 200 located on the driving substrate 100;

[0055] a pixel defining layer 300 located on a side of the first electrode 200 away from the driving substrate 100 , wherein the pixel defining layer 300 defines a plurality of pixel regions;

[0056] a light-emitting structure located on a side of the pixel defining layer 300 away from the driving substrate 100 , the light-emitting structure including at least two stacked light-emitting layers and a charge generation layer 402 located between two adjacent light-emitting layers;

[0057] a second electrode 500 located on a side of the light emitting structure away from the driving substrate 100;

[0058] The oxygen-releasing structure is located between adjacent pixel regions. The oxygen-releasing structure can release oxygen ions under the action of an electric field. The oxygen ions enter the charge generation layer 402 to oxidize the charge generation layer 402 .

[0059] In this embodiment, an oxygen-releasing structure is provided between adjacent pixel regions. The oxygen-releasing structure can release oxygen ions under the action of an electric field. The oxygen ions enter the charge generation layer and react with the charge generation layer, causing the charge generation layer to be oxidized to form a metal oxide, thereby increasing the resistance of the charge generation layer, thereby blocking the leakage between pixels, and thereby avoiding the lighting of adjacent pixels caused by lateral leakage, thereby improving the display effect and increasing the display color gamut of the display device.

[0060] In this embodiment, the oxygen-releasing structure is located between adjacent pixel regions. Therefore, the oxygen ions released by the oxygen-releasing structure will not oxidize the electrodes in the pixel regions, will not affect the pixel regions, and thus will not affect the performance of the display substrate.

[0061] In this embodiment, Figure 2-Figure 4 As shown, the light-emitting structure may include a first light-emitting layer 401 and a second light-emitting layer 403 that are stacked, and a charge generation layer 402 located between the first light-emitting layer 401 and the second light-emitting layer 403; of course, the light-emitting structure is not limited to including two light-emitting layers, but may also include more light-emitting layers. When the light-emitting structure includes three or more light-emitting layers, a charge generation layer is provided between two adjacent light-emitting layers.

[0062] In some embodiments, such as Figure 2-Figure 4As shown, the oxygen-releasing structure includes a stacked electrically excited oxygen-releasing layer 302 and an oxygen-releasing electrode 201, wherein the electrically excited oxygen-releasing layer 302 is capable of releasing oxygen ions under the action of an electric field. Specifically, a reverse bias can be applied to the oxygen-releasing electrode 201 and the second electrode 500, for example, a high-level voltage and a low-level voltage can be applied to the oxygen-releasing electrode 201 and the second electrode 500, respectively. Under the action of the electric field between the oxygen-releasing electrode 201 and the second electrode 500, the oxygen ions in the electrically excited oxygen-releasing layer 302 migrate due to the lowering of the potential well, and a phase transition from a high-oxygen content phase to a low-oxygen content phase occurs with the release of oxygen. The released oxygen ions migrate into the charge generation layer and react with the charge generation layer, causing the charge generation layer to be oxidized to form a metal oxide, thereby increasing the resistance of the charge generation layer, thereby blocking the leakage between pixels, thereby avoiding the adjacent pixels from being illuminated due to lateral leakage, improving the display effect, and increasing the display color gamut of the display device.

[0063] In this embodiment, the electrically stimulated oxygen release layer 302 may be made of rare earth oxides or rare earth composite oxides, such as at least one of cerium dioxide (CeO 2 ), terbium dioxide (TbO 2 ), and praseodymium dioxide (PrO 2 ).

[0064] In a specific example, Figure 2 As shown, the OLED display substrate includes a driving substrate 100, a first electrode 200 located on the driving substrate 100, a pixel defining layer 300 located on the side of the first electrode 200 away from the driving substrate 100, a first light-emitting layer 401 and a second light-emitting layer 403 located on the side of the pixel defining layer 300 away from the driving substrate 100, a charge generation layer 402 located between the first light-emitting layer 401 and the second light-emitting layer 403, and a second electrode 500 located on the side of the second light-emitting layer 403 away from the driving substrate 100. The OLED display substrate also includes an oxygen-releasing structure located between the pixel defining layer 300 and the driving substrate 100. The oxygen-releasing structure is located between adjacent pixel regions and includes an electrically excited oxygen-releasing layer 302 and an oxygen-releasing electrode 201 arranged in a stacked arrangement. The electrically excited oxygen-releasing layer 302 is located between the oxygen-releasing electrode 201 and the pixel defining layer 300. Under the action of the electric field between the oxygen-releasing electrode 201 and the second electrode 500, the oxygen ions in the electrically excited oxygen-releasing layer 302 migrate due to the lower potential well, and can enter the charge generation layer 402 through the pixel defining layer 300 and the first light-emitting layer 401, so that the charge generation layer 402 is oxidized.

[0065] In another specific example, Figure 3As shown, the OLED display substrate includes a driving substrate 100, a first electrode 200 located on the driving substrate 100, a pixel defining layer 300 located on the side of the first electrode 200 away from the driving substrate 100, a first light-emitting layer 401 and a second light-emitting layer 403 located on the side of the pixel defining layer 300 away from the driving substrate 100, a charge generation layer 402 located between the first light-emitting layer 401 and the second light-emitting layer 403, and a second electrode 500 located on the side of the second light-emitting layer 403 away from the driving substrate 100. The OLED display substrate also includes an oxygen-releasing structure located on the side of the pixel defining layer 300 away from the driving substrate 100. The oxygen-releasing structure is located between adjacent pixel regions and includes an electrically excited oxygen-releasing layer 302 and an oxygen-releasing electrode 201 arranged in a stacked manner. The electrically excited oxygen-releasing layer 302 is located on the side of the oxygen-releasing electrode 201 away from the pixel defining layer 300. Under the action of the electric field between the oxygen-releasing electrode 201 and the second electrode 500 , the oxygen ions in the electrically excited oxygen-releasing layer 302 migrate due to the lower potential well and can enter the charge generation layer 402 through the first light-emitting layer 401 , so that the charge generation layer 402 is oxidized.

[0066] In another specific example, Figure 4 As shown, the OLED display substrate includes a driving substrate 100, a first electrode 200 located on the driving substrate 100, a pixel defining layer 300 located on the side of the first electrode 200 away from the driving substrate 100, a first light-emitting layer 401 and a second light-emitting layer 403 located on the side of the pixel defining layer 300 away from the driving substrate 100, a charge generation layer 402 located between the first light-emitting layer 401 and the second light-emitting layer 403, and a second electrode 500 located on the side of the second light-emitting layer 403 away from the driving substrate 100. The pixel defining layer 300 includes a partition structure 301 disposed between adjacent pixel regions. The partition structure has undercut structures formed on both sides. The partition structure 301 can isolate crosstalk between adjacent pixel regions.

[0067] In order to reduce the impact of oxygen release structure on pixel area, such as Figure 4 As shown, the orthographic projection of the oxygen-releasing structure on the driving substrate 100 can be located within the orthographic projection of the partition structure 301 on the driving substrate 100. To prevent oxygen ions from diffusing in the light-emitting layer and affecting the pixel area, the pixel-defining layer between the pixel areas can be configured as a partition structure to block the transmission channel of the light-emitting layer.

[0068] In this embodiment, in order to ensure the electrical properties of the second electrode, the second electrode can be made of at least one of silver alloys such as magnesium-silver alloy, aluminum-silver alloy, copper-silver alloy, magnesium-aluminum-silver alloy, magnesium-copper-silver alloy, aluminum-copper-silver alloy and magnesium-aluminum-copper-silver alloy.

[0069] An embodiment of the present invention further provides a display device, comprising the OLED display substrate described above.

[0070] The display device includes, but is not limited to, components such as a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply. Those skilled in the art will appreciate that the structure of the above-mentioned display device does not limit the display device, and the display device may include more or fewer of the above-mentioned components, or a combination of certain components, or a different arrangement of components. In embodiments of the present invention, the display device includes, but is not limited to, a monitor, a mobile phone, a tablet computer, a television, a wearable electronic device, a navigation display device, and the like.

[0071] The display device can be any product or component with a display function, such as a television, a monitor, a digital photo frame, a mobile phone, a tablet computer, etc., wherein the display device also includes a flexible circuit board, a printed circuit board and a backplane.

[0072] An embodiment of the present invention further provides a method for manufacturing an OLED display substrate, comprising:

[0073] forming a driving substrate;

[0074] forming a first electrode on the driving substrate;

[0075] forming a pixel defining layer on a side of the first electrode away from the driving substrate, wherein the pixel defining layer defines a plurality of pixel areas;

[0076] forming a light-emitting structure on a side of the pixel defining layer away from the driving substrate, the light-emitting structure comprising at least two stacked light-emitting layers and a charge generation layer located between two adjacent light-emitting layers;

[0077] forming a second electrode on a side of the light emitting structure away from the driving substrate;

[0078] An oxygen-releasing structure is formed between adjacent pixel regions. The oxygen-releasing structure can release oxygen ions under the action of an electric field. The oxygen ions enter the charge generation layer, causing the charge generation layer to be oxidized.

[0079] In this embodiment, an oxygen-releasing structure is formed between adjacent pixel areas. The oxygen-releasing structure can release oxygen ions under the action of an electric field. The oxygen ions enter the charge generation layer and react with the charge generation layer, causing the charge generation layer to be oxidized to form metal oxide, thereby increasing the resistance of the charge generation layer, thereby blocking the leakage between pixels, and thus avoiding the lighting of adjacent pixels caused by lateral leakage, improving the display effect, and increasing the display color gamut of the display device.

[0080] In this embodiment, the oxygen-releasing structure is located between adjacent pixel regions. Therefore, the oxygen ions released by the oxygen-releasing structure will not oxidize the electrodes in the pixel regions, will not affect the pixel regions, and thus will not affect the performance of the display substrate.

[0081] In this embodiment, Figure 2-Figure 4 As shown, the light-emitting structure may include a first light-emitting layer 401 and a second light-emitting layer 403 that are stacked, and a charge generation layer 402 located between the first light-emitting layer 401 and the second light-emitting layer 403; of course, the light-emitting structure is not limited to including two light-emitting layers, but may also include more light-emitting layers. When the light-emitting structure includes three or more light-emitting layers, a charge generation layer is provided between two adjacent light-emitting layers.

[0082] In some embodiments, such as Figure 2-Figure 4 As shown, in some embodiments, the oxygen-releasing structure includes a stacked electrically excited oxygen-releasing layer and an oxygen-releasing electrode. The electrically excited oxygen-releasing layer 302 is capable of releasing oxygen ions under the action of an electric field. The oxygen-releasing structure can be located between the pixel defining layer 300 and the drive substrate 100, with the electrically excited oxygen-releasing layer 302 located between the oxygen-releasing electrode 201 and the pixel defining layer 300; or, the oxygen-releasing structure can be located on the side of the pixel defining layer 300 away from the drive substrate 100, with the electrically excited oxygen-releasing layer 302 located on the side of the oxygen-releasing electrode 201 away from the pixel defining layer 300.

[0083] like Figure 5 As shown, forming the oxygen-releasing structure includes:

[0084] Applying a high level voltage to the oxygen-releasing electrode 201;

[0085] applying a low level voltage to the second electrode 500;

[0086] Under the action of the electric field between the oxygen-releasing electrode 201 and the second electrode 500 , the oxygen ions in the electrically stimulated oxygen-releasing layer 302 migrate into the charge-generating layer 402 , causing oxidation of the charge-generating layer.

[0087] Specifically, a reverse bias voltage (the voltage value may be between -6V and -20V) is applied to the oxygen-releasing electrode 201 and the second electrode 500. Figure 5 As shown, high-level voltages and low-level voltages can be applied to the oxygen-releasing electrode 201 and the second electrode 500, respectively. Under the action of the electric field, the oxygen ions in the electrically stimulated oxygen-releasing layer 302 migrate due to the lowered potential well. For example, using CeO2 as the electrically stimulated oxygen-releasing layer 302, a phase transition occurs from a high-oxygen-content phase (CeO2, +4 valence) to a low-oxygen-content phase (CeO3, +3 valence) accompanied by oxygen release. Since the charge generation layer above the oxygen-releasing structure is oxidized to form an oxide, it transforms from a semiconductor to an insulator, effectively blocking lateral leakage between pixels.

[0088] It should be noted that the various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences from other embodiments. In particular, since the embodiments are generally similar to the product embodiments, the description is relatively simple. For relevant parts, refer to the partial description of the product embodiments.

[0089] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0090] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” or “under” another element, it can be “directly on” or “under” the other element or intervening elements may be present.

[0091] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0092] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. An OLED display substrate, characterized in that: include: Driver substrate; a first electrode located on the driving substrate; a pixel defining layer located on a side of the first electrode away from the driving substrate, the pixel defining layer defining a plurality of pixel areas; a light-emitting structure located on a side of the pixel defining layer away from the driving substrate, the light-emitting structure comprising at least two stacked light-emitting layers and a charge generation layer located between two adjacent light-emitting layers; a second electrode located on a side of the light emitting structure away from the driving substrate; An oxygen-releasing structure is located between adjacent pixel regions, and the oxygen-releasing structure can release oxygen ions under the action of an electric field. The oxygen ions enter the charge generation layer, so that the charge generation layer is oxidized.

2. The OLED display substrate according to claim 1, wherein: The oxygen-releasing structure comprises an electrically stimulated oxygen-releasing layer and an oxygen-releasing electrode which are stacked. The electrically stimulated oxygen-releasing layer can release oxygen ions under the action of an electric field.

3. The OLED display substrate according to claim 2, wherein: The electrically stimulated oxygen release layer is made of at least one of cerium dioxide, terbium dioxide and praseodymium dioxide.

4. The OLED display substrate according to claim 1, wherein: The oxygen-releasing structure is located between the pixel defining layer and the driving substrate; or The pixel defining layer is located on a side away from the driving substrate.

5. The OLED display substrate according to claim 1, wherein: The pixel defining layer includes a partition structure disposed between adjacent pixel regions, and undercut structures are formed on two side surfaces of the partition structure.

6. The OLED display substrate according to claim 5, characterized in that: The orthographic projection of the oxygen-releasing structure on the driving substrate is located within the orthographic projection of the partition structure on the driving substrate.

7. The OLED display substrate according to claim 1, wherein: The second electrode is made of at least one of magnesium-silver alloy, aluminum-silver alloy, copper-silver alloy, magnesium-aluminum-silver alloy, magnesium-copper-silver alloy, aluminum-copper-silver alloy and magnesium-aluminum-copper-silver alloy.

8. A display device, characterized in that: The OLED display substrate comprises the OLED display substrate according to any one of claims 1 to 7.

9. A method for manufacturing an OLED display substrate, characterized in that: include: forming a driving substrate; forming a first electrode on the driving substrate; forming a pixel defining layer on a side of the first electrode away from the driving substrate, wherein the pixel defining layer defines a plurality of pixel areas; forming a light-emitting structure on a side of the pixel defining layer away from the driving substrate, the light-emitting structure comprising at least two stacked light-emitting layers and a charge generation layer located between two adjacent light-emitting layers; forming a second electrode on a side of the light emitting structure away from the driving substrate; An oxygen-releasing structure is formed between adjacent pixel regions. The oxygen-releasing structure can release oxygen ions under the action of an electric field. The oxygen ions enter the charge generation layer, causing the charge generation layer to be oxidized.

10. The method for manufacturing an OLED display substrate according to claim 9, wherein: The oxygen-releasing structure includes an electrically excited oxygen-releasing layer and an oxygen-releasing electrode stacked in layers, and the oxygen-releasing structure further includes: applying a high level voltage to the oxygen-releasing electrode; applying a low-level voltage to the second electrode; Under the action of the electric field between the oxygen-releasing electrode and the second electrode, the oxygen ions in the electrically stimulated oxygen-releasing layer migrate into the charge-generating layer, causing oxidation of the charge-generating layer.

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