Display substrate and manufacturing method thereof, and display device

Abstract

The present invention provides a display substrate and a manufacturing method thereof, and a display device, belonging to the field of display technology. The display substrate includes: a base substrate; a plurality of sub-pixels of different colors located on the base substrate, the sub-pixels include a light-emitting unit, the light-emitting unit includes a first electrode, a second electrode and a white light-emitting layer located between the first electrode and the second electrode, the first electrode is located between the white light-emitting layer and the base substrate; the display substrate also includes: a retaining wall surrounding the first electrode, and the retaining walls of sub-pixels of different colors have different heights. The technical solution of the present invention can improve the light extraction efficiency of the display substrate.

Description

Technical Field

[0001] The present invention 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] OLED (Organic Light-Emitting Diode) display devices have been listed as the next generation display technology with great development prospects due to their advantages such as thinness, lightness, wide viewing angle, active light emission, continuously adjustable light color, low cost, fast response speed, low energy consumption, low driving voltage, wide operating temperature range, simple production process, high light emission efficiency and flexible display. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a display substrate and a manufacturing method thereof, and a display device, which can improve the light extraction efficiency of the display substrate.

[0004] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0005] In one aspect, a display substrate is provided, comprising:

[0006] substrate substrate;

[0007] A plurality of sub-pixels of different colors are located on the base substrate, wherein the sub-pixels include a light-emitting unit, and the light-emitting unit includes a first electrode, a second electrode, and a white light-emitting layer located between the first electrode and the second electrode, and the first electrode is located between the white light-emitting layer and the base substrate;

[0008] The display substrate further comprises:

[0009] The barrier walls surrounding the first electrode have different heights for sub-pixels of different colors.

[0010] In some embodiments, the display substrate includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the height of the retaining wall of the blue sub-pixel is greater than the heights of the retaining walls of the green sub-pixel and the red sub-pixel.

[0011] In some embodiments, the height of the retaining wall of the green sub-pixel is greater than the height of the retaining wall of the red sub-pixel.

[0012] In some embodiments, in at least some of the sub-pixels, the surface height of the surface of the blocking wall away from the substrate side is greater than the surface height of the surface of the light-emitting layer away from the substrate side, and the surface height is the minimum distance between the surface and the substrate.

[0013] In some embodiments, an orthographic projection of the retaining wall on the base substrate at least partially overlaps with an orthographic projection of the first electrode on the base substrate.

[0014] In some embodiments, the first electrode is located in a region defined by the retaining wall, and an orthographic projection of the retaining wall on the base substrate partially overlaps with an orthographic projection of the first electrode on the base substrate.

[0015] In some embodiments, the retaining wall is made of inorganic insulating material, organic insulating material or organic-inorganic composite material.

[0016] In some embodiments, the height of the retaining wall is 50 nm to 5000 nm.

[0017] In some embodiments, the second electrode is made of metal and has a thickness of 8 nm to 25 nm.

[0018] In some embodiments, the second electrode is made of transparent conductive oxide and has a thickness of 60 nm to 400 nm.

[0019] In some embodiments, the second electrode is a composite structure of metal and transparent conductive oxide, and has a thickness of 60nm to 400nm. In some embodiments, the display substrate further includes:

[0020] An encapsulation layer located on a side of the light emitting unit away from the substrate;

[0021] A color filter layer is located on a side of the packaging layer away from the base substrate.

[0022] An embodiment of the present invention further provides a display device, comprising the display substrate as described above.

[0023] An embodiment of the present invention further provides a method for manufacturing a display substrate, comprising:

[0024] providing a substrate base plate;

[0025] A plurality of sub-pixels of different colors are formed on the base substrate, wherein the sub-pixels include a light-emitting unit, wherein the light-emitting unit includes a first electrode, a second electrode, and a white light-emitting layer located between the first electrode and the second electrode, wherein the first electrode is located between the white light-emitting layer and the base substrate;

[0026] A barrier wall surrounding the first electrode is formed, and the barrier walls of sub-pixels of different colors have different heights.

[0027] The embodiments of the present invention have the following beneficial effects:

[0028] In the above scheme, the heights of the retaining walls of sub-pixels of different colors are different. Since there is a deposition angle in the evaporation process, when the white light emitting layer is formed by evaporation, it is affected by the retaining walls, and the thickness of the white light emitting layer of sub-pixels of different colors is different. The cavity length of sub-pixels of different colors can be adjusted to improve the light output efficiency of the display substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 and Figure 2 Schematic diagram of the spectrum of a white light OLED device;

[0030] Figure 3 It is a schematic diagram of the structure of a white light OLED device;

[0031] Figure 4 Schematic diagram of the effect of the retaining wall on the evaporation of the light-emitting layer;

[0032] Figure 5-Figure 8 FIG. 2 is a schematic diagram showing a substrate according to an embodiment of the present invention.

[0033] Reference numerals

[0034] 01 Substrate

[0035] 02 Source and drain metal layer

[0036] 03 The first interlayer insulation layer

[0037] 04 Active layer

[0038] 05 Gate insulation layer

[0039] 06 Gate Metal Layer

[0040] 07 Second interlayer insulation layer

[0041] 08 Connecting metal layers

[0042] 09 Anode of blue sub-pixel

[0043] 10 White light emitting layer

[0044] 11 Retaining Wall

[0045] 12 Cathode

[0046] 13 Encapsulation layer

[0047] 14 Color filter unit for blue sub-pixel

[0048] 15 Flat layer

[0049] 16 Anode of red sub-pixel

[0050] 17 Color filter unit for red sub-pixel

[0051] 18 Green sub-pixel color filter unit

[0052] 19 Anode of green sub-pixel

[0053] 20 Anode

[0054] 21. First hole injection layer

[0055] 22. First hole transport layer

[0056] 23 Red organic light emitting layer

[0057] 24 Green organic light emitting layer

[0058] 25 First electron transport layer

[0059] 26 Charge generation layer

[0060] 27 Second hole injection layer

[0061] 28. Second hole transport layer

[0062] 29 Blue organic light emitting layer

[0063] 30 Second electron transport layer

[0064] 31 Electron injection layer

[0065] 32 Cathode

[0066] 33 Capping layer

[0067] 34 Encapsulation layer DETAILED DESCRIPTION

[0068] In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0069] The optimal OLED cavity lengths corresponding to different color emission peaks are inconsistent. In existing top-emitting white light OLED devices, the cavity lengths (the distance between the anode and the cathode) of sub-pixels of different colors are the same, which cannot meet the optimal cavity lengths of sub-pixels of different colors, resulting in low light extraction efficiency of top-emitting white light OLED devices.

[0070] Embodiments of the present invention provide a display substrate and a manufacturing method thereof, and a display device, which can improve the light extraction efficiency of the display substrate.

[0071] An embodiment of the present invention provides a display substrate, comprising:

[0072] substrate substrate;

[0073] A plurality of sub-pixels of different colors are located on the base substrate, wherein the sub-pixels include a light-emitting unit, and the light-emitting unit includes a first electrode, a second electrode, and a white light-emitting layer located between the first electrode and the second electrode, and the first electrode is located between the white light-emitting layer and the base substrate;

[0074] The display substrate further comprises:

[0075] The barrier walls surrounding the first electrode have different heights for sub-pixels of different colors.

[0076] In this embodiment, the heights of the retaining walls of sub-pixels of different colors are different. Since there is a deposition angle in the evaporation process, when the white light emitting layer is formed by evaporation, the thickness of the white light emitting layer of sub-pixels of different colors is different due to the influence of the retaining walls. The cavity lengths of sub-pixels of different colors can be adjusted to improve the light output efficiency of the display substrate.

[0077] The first electrode may be an anode, and the second electrode may be a cathode.

[0078] Different white light OLED cavity lengths have different spectra. By adjusting the cavity length of white light OLED, the luminescence of the R, G, and B luminescence peaks can be specifically enhanced, such as Figure 1 and Figure 2 As shown, Figure 1 The spectrum diagram of white light OLED when the thickness of the hole transport layer is 900 angstroms. Figure 2 Schematic diagram of the spectrum of white light OLED when the thickness of the hole transport layer is 300 angstroms, wherein the abscissa is the wavelength and the ordinate is the light intensity.

[0079] like Figure 3 As shown, the white light OLED device includes an anode 20, a first hole injection layer 21, a first hole transport layer 22, a red organic light emitting layer 23, a green organic light emitting layer 24, a first electron transport layer 25, a charge generation layer 26, a second hole injection layer 27, a second hole transport layer 28, a blue organic light emitting layer 29, a second electron transport layer 30, an electron injection layer 31, a cathode 32, a capping layer 33 and an encapsulation layer 34 stacked in sequence, wherein the first hole injection layer 21, the first hole transport layer 22, the red organic light emitting layer 23, the green organic light emitting layer 24, the first electron transport layer 25, the charge generation layer 26, the second hole injection layer 27, the second hole transport layer 28, the blue organic light emitting layer 29, the second electron transport layer 30, and the electron injection layer 31 constitute the light emitting layer, which is formed by an evaporation process. Due to the existence of an evaporation angle in the evaporation process, an evaporation shadow will be caused, resulting in a thinning of the light emitting layer film, such as Figure 4As shown, substrate is the evaporation substrate, d is the height of the retaining wall, Ts is the vertical height from the evaporation source to the evaporation substrate, D is the horizontal distance from the evaporation source to the center of the evaporation substrate, and Source is the evaporation source. When the retaining wall height and pixel width are designed to be consistent with the evaporation equipment (the height Ts and width Offset of the evaporation equipment), that is, L (pixel width) / d (retaining wall height) = D / Ts, the point source evaporation film thickness is the thinnest in the pixel anode area. Therefore, by designing the height of the retaining wall, light-emitting layers of different film thicknesses can be formed, thereby adjusting the cavity length of the OLED.

[0080] in addition, Figure 3 Only the structure of the white light OLED device in the preferred embodiment is shown, and the structure of the white light OLED device is not limited to the structure of Figure 3 As shown, other structures may also be used, such as adjusting the positions of the red organic light-emitting layer 23 , the green organic light-emitting layer 24 , and the blue organic light-emitting layer 29 .

[0081] In some embodiments, the display substrate includes red sub-pixels, green sub-pixels and blue sub-pixels, and the height of the retaining wall of the blue sub-pixel is greater than the height of the retaining wall of the green sub-pixel and the red sub-pixel. In some embodiments, the height of the retaining wall of the green sub-pixel is greater than the height of the retaining wall of the red sub-pixel. Under normal circumstances, the optimal cavity lengths of the red sub-pixel, the green sub-pixel and the blue sub-pixel decrease in sequence, the cavity length of the red sub-pixel is the longest, the green sub-pixel is the second, and the cavity length of the blue sub-pixel is the shortest. Therefore, in this embodiment, the height of the retaining wall of the blue sub-pixel is increased, and the film thickness of the blue sub-pixel light-emitting layer is reduced by increasing the evaporation Shadow method, so that the cavity length of the blue sub-pixel meets the blue light emission, thereby improving the light emission efficiency of the blue sub-pixel; in this embodiment, the height of the retaining wall of the green sub-pixel is controlled to achieve the purpose of controlling the cavity length of the green sub-pixel, thereby improving the light emission of the green sub-pixel; similarly, in this embodiment, the height of the retaining wall of the red sub-pixel is controlled to obtain the optimal cavity length of the red sub-pixel, thereby improving the light emission of the red sub-pixel. In the above manner, the light emission efficiency of the device is improved.

[0082] Of course, according to actual needs, it can also be set that the height of the retaining wall of the blue sub-pixel is greater than the height of the retaining wall of the red sub-pixel, and the height of the retaining wall of the red sub-pixel is greater than the height of the retaining wall of the green sub-pixel; or, the height of the retaining wall of the red sub-pixel is greater than the height of the retaining wall of the blue sub-pixel, and the height of the retaining wall of the blue sub-pixel is greater than the height of the retaining wall of the green sub-pixel; or, the height of the retaining wall of the green sub-pixel is greater than the height of the retaining wall of the red sub-pixel, and the height of the retaining wall of the red sub-pixel is greater than the height of the retaining wall of the blue sub-pixel, and so on.

[0083] In this embodiment, the second electrode may be made of metal with a thickness of 8nm to 25nm; or

[0084] The second electrode may be made of a transparent conductive oxide with a thickness of 60nm to 400nm; or

[0085] The second electrode may be a composite structure of metal and transparent conductive oxide, with a thickness of 60nm to 400nm.

[0086] In some embodiments, in at least some of the sub-pixels, the surface height of the surface of the retaining wall away from the substrate is greater than the surface height of the surface of the light-emitting layer away from the substrate, and the surface height is the minimum distance between the surface and the substrate. In this way, some film layers in the light-emitting layer can be broken between sub-pixels, thereby avoiding electrical crosstalk between sub-pixels and improving the color gamut.

[0087] In some embodiments, the orthographic projection of the retaining wall on the base substrate at least partially overlaps with the orthographic projection of the first electrode on the base substrate, that is, a portion of the retaining wall covers the first electrode and a portion does not cover the first electrode, so that the film thickness of the light-emitting layer in the area defined by the retaining wall can be adjusted.

[0088] In some embodiments, such as Figure 6-Figure 8 As shown, specifically, the first electrode is located in the area defined by the retaining wall, and the orthographic projection of the retaining wall on the substrate partially overlaps with the orthographic projection of the first electrode on the substrate, so that the first electrode is completely located in the area defined by the retaining wall, and the area defined by the retaining wall can be prevented from exceeding the range of the sub-pixel. Of course, it is also possible that the first electrode is located in the area defined by the retaining wall, and the inner boundary of the orthographic projection of the retaining wall on the substrate coincides with the outer boundary of the orthographic projection of the first electrode on the substrate.

[0089] In some embodiments, the retaining wall may be made of inorganic insulating materials, such as silicon nitride, silicon oxide, silicon oxynitride, etc. The height of the retaining wall may be 50 nm to 5000 nm, depending on the cavity length to be designed.

[0090] In some embodiments, the display substrate further comprises:

[0091] An encapsulation layer located on a side of the light emitting unit away from the substrate;

[0092] The color filter layer is located on the side of the encapsulation layer away from the base substrate, so that color display of the display substrate can be achieved.

[0093] In a specific example, Figure 5-Figure 8As shown, the display substrate includes a red sub-pixel, a blue sub-pixel and a green sub-pixel, and the display substrate includes a base substrate 01, a source-drain metal layer 02, a first interlayer insulating layer 03, an active layer 04, a gate insulating layer 05, a gate metal layer 06, a second interlayer insulating layer 07 and a connecting metal layer 08 stacked in sequence, and the metal layers of different layers are connected by vias, such as tungsten holes, wherein the base substrate 01 can be a flexible substrate, or a hard substrate, such as a glass substrate or a quartz substrate, or a silicon-based substrate. The display substrate also includes an anode 16 of a red sub-pixel, an anode 19 of a green sub-pixel and an anode 09 of a blue sub-pixel, and the display substrate is provided with a retaining wall 11 surrounding the anode, and the shape defined by the retaining wall 11 matches the shape of the anode, and the heights of the retaining walls of sub-pixels of different colors are different, and the retaining wall height of the blue sub-pixel is the highest, the retaining wall height of the green sub-pixel is the second highest, and the retaining wall height of the red sub-pixel is the smallest. In this way, when the light-emitting layer 10 is formed by evaporation, due to the existence of the retaining wall, the evaporation process Shadow causes the light-emitting layer thickness of the blue sub-pixel to be the smallest, the light-emitting layer thickness of the green sub-pixel to be the second largest, and the light-emitting layer thickness of the red sub-pixel to be the smallest. The light-emitting cavity lengths of sub-pixels of different colors can be adjusted, which is more conducive to the light output of the device.

[0094] When the cathode 12 is formed by evaporation, due to the presence of the retaining wall, in order to avoid the cathode 12 from breaking, the total thickness of the light-emitting layer and the cathode should be close to the height of the highest retaining wall; or, the cathode can be made of a material with good film-forming properties. The display substrate also includes an encapsulation layer 13 and a color filter unit 14 for a blue sub-pixel, a color filter unit 17 for a red sub-pixel, and a color filter unit 18 for a green sub-pixel located on the encapsulation layer 13, so that color display of the display substrate can be achieved.

[0095] In some embodiments, such as Figure 5 As shown, the color filter unit 14 of the blue sub-pixel, the color filter unit 17 of the red sub-pixel and the color filter unit 18 of the green sub-pixel do not overlap with each other; in other embodiments, the color filter unit 14 of the adjacent blue sub-pixel, the color filter unit 17 of the red sub-pixel and the color filter unit 18 of the adjacent green sub-pixel may also partially overlap.

[0096] In this embodiment, in some sub-pixels, the surface height of the surface of the retaining wall away from the substrate side is higher than the surface height of the surface of the light-emitting layer away from the substrate side, so that the light-emitting layer will be broken at the edge of the sub-pixel, avoiding electrical crosstalk between sub-pixels and improving the color gamut.

[0097] An embodiment of the present invention further provides a display device, comprising the display substrate as described above.

[0098] The display device includes but is not limited to: 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 constitute a limitation on the display device, and the display device may include more or less of the above-mentioned components, or a combination of certain components, or different component arrangements. In an embodiment of the present invention, the display device includes but is not limited to a display, a mobile phone, a tablet computer, a television, a wearable electronic device, a navigation display device, and the like.

[0099] The display device may 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 further includes a flexible circuit board, a printed circuit board and a backplane.

[0100] An embodiment of the present invention further provides a method for manufacturing a display substrate, comprising:

[0101] providing a substrate base plate;

[0102] A plurality of sub-pixels of different colors are formed on the base substrate, wherein the sub-pixels include a light-emitting unit, wherein the light-emitting unit includes a first electrode, a second electrode, and a white light-emitting layer located between the first electrode and the second electrode, wherein the first electrode is located between the white light-emitting layer and the base substrate;

[0103] A barrier wall surrounding the first electrode is formed, and the barrier walls of sub-pixels of different colors have different heights.

[0104] In this embodiment, the heights of the retaining walls of sub-pixels of different colors are different. Since there is a deposition angle in the evaporation process, when the white light emitting layer is formed by evaporation, the thickness of the white light emitting layer of sub-pixels of different colors is different due to the influence of the retaining walls. The cavity lengths of sub-pixels of different colors can be adjusted to improve the light output efficiency of the display substrate.

[0105] In the manufacturing method of this embodiment, Figure 5-Figure 8As shown, a thin film transistor array is first formed on a substrate 01, and the thin film transistor array includes a source-drain metal layer 02, a first interlayer insulating layer 03, an active layer 04, a gate insulating layer 05, a gate metal layer 06, a second interlayer insulating layer 07 and a connecting metal layer 08 stacked in sequence; then an anode is formed, and the anode includes an anode 16 of a red sub-pixel, an anode 19 of a green sub-pixel and an anode 09 of a blue sub-pixel; a surrounding retaining wall 11 is formed, and the shape defined by the retaining wall 11 matches the shape of the anode, and the heights of the retaining walls of sub-pixels of different colors are different, the retaining wall height of the blue sub-pixel is the highest, the retaining wall height of the green sub-pixel is the second highest, and the retaining wall height of the red sub-pixel is the smallest; and a light-emitting layer 10 is formed by evaporation, and due to the existence of the retaining wall, the evaporation process The shadow technique causes the thickness of the light-emitting layer of the blue sub-pixel to be the smallest, followed by the thickness of the light-emitting layer of the green sub-pixel, and the thickness of the light-emitting layer of the red sub-pixel to be the smallest. The length of the light-emitting cavity of sub-pixels of different colors can be adjusted, which is more conducive to the light emission of the device; the cathode is formed by evaporation, and due to the existence of the retaining wall, in order to avoid the cathode 12 from breaking, the total thickness of the light-emitting layer and the cathode should be greater than the height of the highest retaining wall; an encapsulation layer 13 is formed on the side of the light-emitting unit away from the base substrate; a color filter layer is formed on the side of the encapsulation layer 13 away from the base substrate 01, including a color filter unit 14 for the blue sub-pixel, a color filter unit 17 for the red sub-pixel, and a color filter unit 18 for the green sub-pixel, so as to realize color display of the display substrate.

[0106] Of course, according to actual needs, it can also be set that the height of the retaining wall of the blue sub-pixel is greater than the height of the retaining wall of the red sub-pixel, and the height of the retaining wall of the red sub-pixel is greater than the height of the retaining wall of the green sub-pixel; or, the height of the retaining wall of the red sub-pixel is greater than the height of the retaining wall of the blue sub-pixel, and the height of the retaining wall of the blue sub-pixel is greater than the height of the retaining wall of the green sub-pixel; or, the height of the retaining wall of the green sub-pixel is greater than the height of the retaining wall of the red sub-pixel, and the height of the retaining wall of the red sub-pixel is greater than the height of the retaining wall of the blue sub-pixel, and so on.

[0107] In this embodiment, in some sub-pixels, the surface height of the surface of the retaining wall away from the substrate side is higher than the surface height of the surface of the light-emitting layer away from the substrate side, so that the light-emitting layer will be broken at the edge of the sub-pixel, avoiding electrical crosstalk between sub-pixels and improving the color gamut.

[0108] In the various method embodiments of the present invention, the serial numbers of the steps cannot be used to limit the sequence of the steps. For ordinary technicians in this field, without paying creative work, changes to the sequence of the steps are also within the protection scope of the present invention.

[0109] It should be noted that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the embodiments, since they are basically similar to the product embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the product embodiments.

[0110] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words 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 described object changes, the relative positional relationship may also change accordingly.

[0111] 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.

[0112] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0113] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A display substrate, characterized in that: include: substrate substrate; A plurality of sub-pixels of different colors are located on the base substrate, wherein the sub-pixels include a light-emitting unit, and the light-emitting unit includes a first electrode, a second electrode, and a white light-emitting layer located between the first electrode and the second electrode, and the first electrode is located between the white light-emitting layer and the base substrate; The display substrate further comprises: The retaining walls surrounding the first electrode have different heights for sub-pixels of different colors; The display substrate includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the height of the blocking wall of the blue sub-pixel is greater than the heights of the blocking walls of the green sub-pixel and the red sub-pixel.

2. The display substrate according to claim 1, characterized in that: The height of the retaining wall of the green sub-pixel is greater than the height of the retaining wall of the red sub-pixel.

3. The display substrate according to claim 1, characterized in that: In at least some of the sub-pixels, the surface height of the blocking wall away from the substrate is greater than the surface height of the light-emitting layer away from the substrate, and the surface height is the minimum distance between the surface and the substrate.

4. The display substrate according to claim 1, characterized in that: An orthographic projection of the retaining wall on the base substrate at least partially overlaps with an orthographic projection of the first electrode on the base substrate.

5. The display substrate according to claim 4, characterized in that: The first electrode is located in a region defined by the retaining wall, and an orthographic projection of the retaining wall on the base substrate partially overlaps with an orthographic projection of the first electrode on the base substrate.

6. The display substrate according to claim 1, characterized in that: The retaining wall is made of inorganic insulating material, organic insulating material or organic-inorganic composite material.

7. The display substrate according to claim 1, characterized in that: The height of the retaining wall is 50nm~5000nm.

8. The display substrate according to claim 1, characterized in that: The second electrode is made of metal and has a thickness of 8nm-25nm.

9. The display substrate according to claim 1, characterized in that: The second electrode is made of transparent conductive oxide and has a thickness of 60nm-400nm.

10. The display substrate according to claim 1, characterized in that: The second electrode adopts a composite structure of metal and transparent conductive oxide, and has a thickness of 60nm-400nm.

11. The display substrate according to any one of claims 1 to 10, characterized in that: The display substrate further comprises: An encapsulation layer located on a side of the light emitting unit away from the substrate; A color filter layer is located on a side of the packaging layer away from the base substrate.

12. A display device, characterized in that: The invention comprises a display substrate as claimed in any one of claims 1 to 11.

13. A method for manufacturing a display substrate, characterized in that: include: providing a substrate base plate; A plurality of sub-pixels of different colors are formed on the base substrate, wherein the sub-pixels include a light-emitting unit, wherein the light-emitting unit includes a first electrode, a second electrode, and a white light-emitting layer located between the first electrode and the second electrode, wherein the first electrode is located between the white light-emitting layer and the base substrate; forming a barrier wall surrounding the first electrode, wherein the barrier walls of sub-pixels of different colors have different heights; The display substrate includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the height of the blocking wall of the blue sub-pixel is greater than the heights of the blocking walls of the green sub-pixel and the red sub-pixel.

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