Display substrate, display panel and display device

Abstract

This application relates to the field of display technology, and more particularly to a display substrate, a display panel, and a display device. The display substrate includes a substrate and pixel defining units disposed on one side of the substrate. The pixel defining units have a plurality of first pixel openings and a plurality of second pixel openings. An auxiliary electrode is disposed between the first pixel openings and the second pixel openings. This application, by using an auxiliary electrode disposed between the first and second pixel openings, facilitates communication between the electrode on one side of the pixel unit and the auxiliary electrode during the fabrication of pixel units in the first and second pixel openings. The introduction of the auxiliary electrode increases the current density on the surface of the pixel unit electrode, thereby improving the electrode polarization and contributing to improved light-emitting performance of the light-emitting device. Consequently, it makes the light emission of large-size display panels more uniform.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to display substrates, display panels and display devices. Background Technology

[0002] In the field of optoelectronic technology, display panels generally use light-emitting diodes (OLEDs) or quantum dot light-emitting diodes (QLEDs) to display vibrant colors. However, display panels still suffer from poor uniformity and stability of light emission, which affects the display effect and lifespan of the light-emitting panel. Summary of the Invention

[0003] Based on this, embodiments of this application provide a display substrate, a display panel, and a display device.

[0004] This application provides a display substrate, including a substrate and a pixel defining unit disposed on one side of the substrate, wherein the pixel defining unit has a plurality of first pixel openings and a plurality of second pixel openings;

[0005] An auxiliary electrode is provided between the first pixel opening and the second pixel opening.

[0006] This application embodiment also provides a display panel, the display panel including a display substrate, the display substrate including a substrate and a pixel defining unit disposed on one side of the substrate, the pixel defining unit having a plurality of first pixel openings and a plurality of second pixel openings, and an auxiliary electrode being disposed between the first pixel openings and the second pixel openings;

[0007] The first pixel opening and the second pixel opening are respectively provided with a first light-emitting unit and a second light-emitting unit, and adjacent first light-emitting units and second light-emitting units are connected through the auxiliary electrode.

[0008] This application provides a display device, including the display substrate or display panel described above.

[0009] Compared with the prior art, the embodiments of this application have the following main advantages:

[0010] The display substrate of this application embodiment has an auxiliary electrode disposed between the first pixel opening and the second pixel opening. This facilitates the connection between the electrode on one side of the pixel unit and the auxiliary electrode when the pixel unit is fabricated in the first pixel opening and the second pixel opening. The introduction of the auxiliary electrode can increase the current density on the surface of the pixel unit electrode, thereby improving the electrode polarization and helping to improve the light emission performance of the light-emitting device. Consequently, the light emission of the large-size display panel is more uniform. Attached Figure Description

[0011] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a partial top view of a display substrate provided in an embodiment of this application;

[0013] Figure 2 This is an embodiment of the present application. Figure 1 The diagram shows a cross-sectional view of the display substrate along AA.

[0014] Figure 3 This is another cross-sectional schematic diagram of the display substrate provided in the embodiments of this application;

[0015] Figure 4 This is a partial top view of a display substrate provided in another embodiment of this application;

[0016] Figure 5 This is an embodiment of the present application. Figure 4 The diagram shows a cross-sectional view of the display substrate along BB.

[0017] Figure 6 This is an embodiment of the present application. Figure 1 The diagram shows a cross-sectional view of the display substrate along the CC direction.

[0018] Figure 7 This is a cross-sectional schematic diagram of a display panel provided in an embodiment of this application;

[0019] Figure 8 This is a flowchart illustrating the fabrication process of a display panel according to an embodiment of this application;

[0020] Figure 9 This is a schematic diagram of the state when the display substrate is printed with functional layers according to the embodiments of this application;

[0021] Figure 10 This is a schematic diagram of the state when the first cathode is printed on the display substrate according to an embodiment of this application;

[0022] Figure 11 This is a vacuuming process curve of a functional layer in a display panel provided in an embodiment of this application.

[0023] Figure label:

[0024] 1-First light-emitting unit; 2-Second light-emitting unit; 3-Third light-emitting unit; 101a-First electrode; 102a-First hole functional layer; 103a-First light-emitting layer; 104a-First electron functional layer; 105a-Second electrode; 101b-Third electrode; 102b-Second hole functional layer; 103b-Second light-emitting layer; 104b-Second electron functional layer; 105b-Fourth electrode; 101c-Fifth electrode; 106-Third hole functional layer; 107-Third light-emitting layer; 108-Third electron functional layer; 109-Sixth electrode; 10-Substrate; 2 0 - Pixel defining unit; 20a - First pixel opening; 20b - Second pixel opening; 20c - Third pixel opening; 201 - First defining portion; 201a - Auxiliary opening; 202 - Second defining portion; 203 - Third defining portion; 204 - Fourth defining portion; 21a - First sub-layer; 21b - Second sub-layer; 21c - Third sub-layer; 22a - Fourth sub-layer; 22b - Fifth sub-layer; 22c - Sixth sub-layer; 23a - Seventh sub-layer; 23b - Eighth sub-layer; 23c - Ninth sub-layer; 30 - Auxiliary electrode; 40 - First functional layer liquid film; 50 - First cathode liquid film. Detailed Implementation

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] Please refer to Figure 1 and Figure 2 This application provides a display substrate, including a substrate 10 and a pixel defining unit 20 disposed on one side of the substrate 10. The pixel defining unit 20 has a plurality of first pixel openings 20a and a plurality of second pixel openings 20b.

[0028] An auxiliary electrode 30 is provided between the first pixel opening 20a and the second pixel opening 20b. In some embodiments, the auxiliary electrode 30 is preferably a cathode auxiliary electrode.

[0029] In this embodiment, an auxiliary electrode 30 is disposed between the first pixel opening 20a and the second pixel opening 20b. This facilitates the connection between the electrode on one side of the pixel unit and the auxiliary electrode 30 when pixel units are fabricated in the first pixel opening 20a and the second pixel opening 20b. The introduction of the auxiliary electrode 30 can increase the current density on the surface of the pixel unit electrode, thereby improving the electrode polarization and helping to improve the light-emitting performance of the light-emitting device. Consequently, it makes the light emission of large-size display panels more uniform.

[0030] In one embodiment, refer back Figure 1 and Figure 2 A plurality of first pixel openings 20a are arranged sequentially along a first direction D1 to form a first pixel group, and a plurality of second pixel openings 20b are arranged sequentially along the first direction D1 to form a second pixel group. The plurality of first pixel groups and the plurality of second pixel groups are arranged cyclically along a second direction D2. The pixel defining unit 20 includes a first defining portion 201 located between the first pixel group and the second pixel group, and an auxiliary electrode 30 is provided in the first defining portion 201. Both the first direction D1 and the second direction D2 are parallel to the surface extension direction of the substrate 10.

[0031] In one embodiment, such as Figure 2 and Figure 5 As shown, the first defining portion 201 has an auxiliary opening 201a; an auxiliary electrode 30 is disposed in the auxiliary opening 201a, and the height H1 of the upper surface of the auxiliary electrode 30 is less than the height H2 of the upper surface of the first defining portion 201 relative to the substrate 10.

[0032] In this embodiment, the presence of the auxiliary opening 201a causes the first defining portion 201 to be divided into two parts, and the two parts and the auxiliary electrode 30 therein constitute the pixel separation structure of the first pixel opening 20a and the second pixel opening 20b.

[0033] In this embodiment, by making the height of the auxiliary electrode 30 lower than that of the first defining portion 201, the ink can spread as much as possible until it covers the entire first defining portion 201 when the uppermost electrode (such as the cathode) is printed in the first pixel opening 20a and the second pixel opening 20b. This allows the printed electrode to be connected to the auxiliary electrode 30. The introduction of the auxiliary electrode 30 can increase the current density on the electrode surface, thereby improving the electrode polarization and helping to improve the light-emitting performance of the fabricated hybrid light-emitting diode device. Consequently, the display panel manufactured based on the hybrid light-emitting diode device emits light more uniformly.

[0034] In this embodiment, the auxiliary opening 201a extends through the pixel defining unit 20 to the substrate 10, providing more space for the auxiliary electrode 30, which helps to increase the current density on the electrode surface, thereby improving the electrode polarization. In other embodiments, such as Figure 3 As shown, the auxiliary opening 201a may also be a structure that does not penetrate the pixel defining unit 20, and is not limited here.

[0035] In one embodiment, such as Figure 4 As shown, the pixel defining unit 20 also has a plurality of third pixel openings 20c, and the pixel defining unit 20 further includes a second defining portion 202. Relative to the substrate 10, the second defining portion 202 is located between the first pixel opening 20a and the third pixel opening 20c, and / or the second defining portion 202 is located between the second pixel opening 20b and the third pixel opening 20c.

[0036] In one embodiment, a plurality of third pixel openings 20c are arranged sequentially along a first direction D1 to form a third pixel group, and a plurality of first pixel groups, a plurality of second pixel groups, and a plurality of third pixel groups are arranged sequentially and cyclically along a second direction D2. The second defining portion 202 is located between the first pixel group and the third pixel group, and / or the second defining portion 202 is located between the second pixel group and the third pixel group.

[0037] In some embodiments, the second defining portion 202 is also located between two adjacent third pixel openings 20c.

[0038] In the above embodiments, the first defining portion 201 constitutes a pixel separation structure between the first pixel opening 20a and the second pixel opening 20b; while the second defining portion 202 constitutes a pixel separation structure between the second pixel opening 20b and the third pixel opening 20c, and also constitutes a pixel separation structure between the third pixel opening 20c and the first pixel opening 20a. In this embodiment, pixel units of different colors or materials can be provided in the first pixel opening 20a, the second pixel opening 20b, and the third pixel opening 20c. For example, quantum dot pixel units can be provided in the first pixel opening 20a and the second pixel opening 20b, and organic pixel units can be provided in the third pixel opening 20c. In a specific embodiment, a red quantum dot pixel unit is provided in the first pixel opening 20a, a green quantum dot pixel unit is provided in the second pixel opening 20b, and a blue organic pixel unit is provided in the third pixel opening 20c, which can be used to fabricate a hybrid light-emitting diode device.

[0039] like Figure 5 As shown, in this embodiment, the height H2 of the upper surface of the first defining portion 201 of the display substrate is less than the height H3 of the upper surface of the second defining portion 202. On the one hand, this allows for functional layer printing separation in the first pixel opening 20a and the second pixel opening 20b, reducing the mixing of different pixel colors and improving the purity of the light-emitting device colors. On the other hand, by making the height of the first defining portion 201 between the first pixel opening 20a and the second pixel opening 20b less than other portions (the second defining portion 202), the separation of the third pixel opening 20c from the first pixel opening 20a or the second pixel opening 20b can be achieved, thereby facilitating subsequent separation in the first pixel opening 20a and the second pixel opening 20b. The separation between the printed electronic functional layer and the evaporated electronic functional layer in the third pixel opening 20c is achieved by first printing the electronic functional layer and cathode in the first pixel opening 20a and the second pixel opening 20b, and then evaporating the electronic functional layer in the third pixel opening 20c. This reduces the probability of ink flowing into the third pixel opening 20c when printing the electron transport layer in the first pixel opening 20a and the second pixel opening 20b, and also avoids affecting the pixel structure in the first pixel opening 20a and the second pixel opening 20b when evaporating the electronic functional layer in the third pixel opening 20c. This reduces the difficulty of device fabrication. The hybrid light-emitting diode device fabricated based on this display substrate has a unified structure of different color sub-pixels, which can improve the display effect.

[0040] In one embodiment, see Figure 1 and Figure 6The pixel defining unit 20 further includes a third defining portion 203 and a fourth defining portion 204. The third defining portion 203 and the fourth defining portion 204 are sequentially and spaced apart between two adjacent first pixel openings 20a, and are also sequentially and spaced apart between two adjacent second pixel openings 20b. Specifically, the fourth defining portion 204 separates the first pixel openings 20a into groups of two, and also separates the second pixel openings 20b into groups of two; the third defining portion 203 separates the two first pixel openings 20a in the same group, and also separates the two second pixel openings 20b in the same group.

[0041] In one embodiment, such as Figure 6 As shown, relative to the substrate, the height H4 of the upper surface of the third defining portion 203 is less than the height H2 of the upper surface of the first defining portion 201. Optionally, the height of the upper surface of the third defining portion 203 ranges from 100 to 500 nm.

[0042] In one embodiment, such as Figure 6 As shown, relative to the substrate, the height H5 of the upper surface of the fourth defining portion 204 is less than or equal to the height H2 of the upper surface of the first defining portion 201. Optionally, the height of the upper surface of the fourth defining portion 204 ranges from 100 to 1800 nm.

[0043] In one embodiment, the height H2 of the upper surface of the first defining portion 201 relative to the substrate 10 is 600-1800 nm;

[0044] Optionally, the height H2 of the upper surface of the first defining portion 201 relative to the substrate 10 is selected from any one or a combination of 600nm, 700nm, 800nm, 900nm, 1000nm, 1100nm, 1200nm, 1300nm, 1400nm, 1500nm, 1600nm, 1700nm, and 1800nm.

[0045] In one embodiment, the height H3 of the upper surface of the second defining portion 202 relative to the substrate 10 is 1000-2000 nm;

[0046] Optionally, the height H3 of the upper surface of the second defining portion 202 relative to the substrate 10 is selected from any one or a combination of 1000nm, 1100nm, 1200nm, 1300nm, 1400nm, 1500nm, 1600nm, 1700nm, 1800nm, 1900nm, and 2000nm.

[0047] In one embodiment, the height H1 of the upper surface of the auxiliary electrode 30 relative to the substrate 10 is 480–1710 nm;

[0048] Optionally, the height H1 of the upper surface of the auxiliary electrode 30 relative to the substrate 10 is selected from any one or a combination of 480nm, 580nm, 680nm, 780nm, 880nm, 980nm, 1080nm, 1150nm, 1210nm, 1270nm, 1330nm, 1390nm, 1450nm, 1550nm, 1600nm, 1640nm, and 1710nm.

[0049] In one embodiment, relative to the substrate 10, the height H2 of the upper surface of the first defining portion 201 is 60% to 90% of the height H3 of the upper surface of the second defining portion 202;

[0050] Optionally, the height H2 of the upper surface of the first defining portion 201 is a range formed by any one or two of the height H3 of the upper surface of the second defining portion 202, which is 60%, 65%, 70%, 75%, 80%, 85%, or 90%.

[0051] In one embodiment, the height H1 of the upper surface of the auxiliary electrode 30 relative to the substrate 10 is 80% to 95% of the height H2 of the upper surface of the first defining portion 201;

[0052] Optionally, the height H1 of the upper surface of the auxiliary electrode 30 is a range formed by any one or two of the height H2 of the upper surface of the first defining portion 201, which is 80%, 85%, 90%, or 95%.

[0053] In one embodiment, the auxiliary electrode 30 is made of silver or gold.

[0054] In one embodiment, such as Figure 4 and Figure 5 As shown, in the second direction D2, the width W1 of the upper surface of the first defining portion 201 is smaller than the width W2 of the upper surface of the second defining portion 202.

[0055] In this embodiment, the width W2 of the upper surface of the second defining portion 202 is greater than the width W1 of the upper surface of the first defining portion 201, and the width of the upper surface of the first defining portion 201 is greater than the width W3 of the auxiliary electrode 30, which helps to maintain the stability of the device structure and the uniform distribution of current.

[0056] In one embodiment, in the first direction, the width W1 of the upper surface of the first defining portion 201 is 2 to 20 μm.

[0057] Optionally, the width W1 of the upper surface of the first defining portion 201 is selected from any one or two of 2um, 4um, 6um, 8um, 10um, 12um, 14um, 16um, 18um, and 20um.

[0058] In one embodiment, in the first direction, the width W2 of the upper surface of the second defining portion 202 is 5 to 30 μm.

[0059] Optionally, the width W2 of the upper surface of the second defining portion 202 is selected from any one or a combination of 5um, 10um, 15um, 20um, 25um, and 30um.

[0060] In one embodiment, the width of the upper surface of the auxiliary electrode 30 is 2 to 10 μm in the direction in which the first pixel opening 20a, the second pixel opening 20b, and the third pixel opening 20c are arranged.

[0061] Optionally, the width W3 of the upper surface of the auxiliary electrode 30 is selected from any one or a range formed by two of 2um, 4um, 6um, 8um, and 10um.

[0062] In one embodiment, the sides of the first defining portion 201 and the second defining portion 202 away from the substrate 10 are hydrophobic, and the hydrophobicity of the side of the first defining portion 201 away from the substrate 10 is less than the hydrophobicity of the side of the second defining portion 202 away from the substrate 10. Hydrophobicity refers to the ability of a material surface to resist liquid adhesion or wetting. A hydrophobic surface can cause liquid to form spherical droplets, creating a larger contact angle, thereby reducing the contact area between the liquid and the surface and facilitating rapid liquid roll-off. In this embodiment, the liquid refers to at least one of a polar solution and an organic solution.

[0063] In this embodiment, the hydrophobicity of the side of the first defining portion 201 away from the substrate 10 is less than that of the side of the second defining portion 202 away from the substrate 10. This means that the contact angle formed by the polar solution or organic solution after spreading on the side of the first defining portion 201 away from the substrate 10 is smaller than the contact angle formed on the side of the second defining portion 202 away from the substrate 10. All comparisons of hydrophobicity in this application follow the same principle.

[0064] In this embodiment, the difference in hydrophobicity between the first defining portion 201 and the second defining portion 202 enables the ink to be confined within the third pixel opening 20c when the functional layer is printed in the third pixel opening 20c. This prevents the ink from overflowing the top layer 21 of the second defining portion 202 and entering the first pixel opening 20a or the second pixel opening 20b, thus avoiding pixel mixing. This is beneficial for improving the display effect of the hybrid light-emitting diode device.

[0065] In one embodiment, the third defining portion is hydrophilic. This helps to confine the ink within the first pixel opening 20a or the second pixel opening 20b, preventing ink overflow and pixel mixing in other areas, thus improving the display effect of the hybrid light-emitting diode device. Hydrophilicity refers to the property of a material surface to attract and be easily wetted by liquids, allowing the liquid to spread on the surface, forming a small contact angle, and easily adhering to the surface. In this embodiment, the liquid refers to at least one of a polar solution and an organic solution.

[0066] In one embodiment, the hydrophobicity of the side of the fourth defining portion away from the substrate helps to confine the ink within the first pixel opening 20a or the second pixel opening 20b, preventing ink overflow and pixel mixing in other areas, thus improving the display effect of the hybrid light-emitting diode device.

[0067] In one embodiment, see Figure 5 The first defining portion 201, the second defining portion 202, and the fourth defining portion 204 are multi-layer structures. From the pixel defining unit 20 toward the substrate 10, the first defining portion 201 includes a first sub-layer 21a, a second sub-layer 21b, and a third sub-layer 21c stacked in sequence; the second defining portion 202 includes a fourth sub-layer 22a, a fifth sub-layer 22b, and a sixth sub-layer 22c stacked in sequence; and the fourth defining portion 204 includes a seventh sub-layer 23a, an eighth sub-layer 23b, and a ninth sub-layer 23c stacked in sequence.

[0068] In one embodiment, relative to the substrate 10, the height of the upper surface of the first sub-layer 21a is less than the height of the upper surface of the fourth sub-layer 22a, and the height of the upper surface of the seventh sub-layer 23a is less than or equal to the height of the upper surface of the first sub-layer 21a. This embodiment can reduce the mixing of different pixel colors, improve the purity of the light-emitting device color, and facilitate the separation of printing the electronic functional layer in the first pixel opening 20a and the second pixel opening 20b and evaporating the electronic functional layer in the third pixel opening 20c. This can reduce the difficulty of device fabrication, make the structure of different color sub-pixels in the fabricated hybrid light-emitting diode device uniform, and improve the display effect. In one embodiment, the main material of the first sublayer 21a, the fourth sublayer 22a, and / or the seventh sublayer 23a is selected from at least one of polyimide materials, PMMA, and organosilicon. When the first sublayer 21a and the fourth sublayer 22a are made of the same material, the first sublayer 21a is treated with ultraviolet light to reduce its hydrophobicity. Specifically, even if the first sublayer 21a and the fourth sublayer 22a are made of the same material, the reason for the different hydrophobicities is that after the first sublayer 21a is prepared, it is treated with ultraviolet light, which reduces the hydrophobicity of the first sublayer 21a, making it less than that of the fourth sublayer 22a.

[0069] In one embodiment, refer back Figure 5 The orthographic projection of the first sublayer 21a onto the substrate 10 lies within the orthographic projection of the second sublayer 21b onto the substrate 10, and the orthographic projection of the second sublayer 21b onto the substrate 10 lies within the orthographic projection of the third sublayer 21c onto the substrate 10; and / or, the orthographic projection of the fourth sublayer 22a onto the substrate 10 lies within the orthographic projection of the fifth sublayer 22b onto the substrate 10, and the orthographic projection of the fifth sublayer 22b onto the substrate 10 lies within the orthographic projection of the sixth sublayer 22c onto the substrate 10; and / or, the orthographic projection of the seventh sublayer 23a onto the substrate 10 lies within the orthographic projection of the eighth sublayer 23b onto the substrate 10, and the orthographic projection of the eighth sublayer 23b onto the substrate 10 lies within the orthographic projection of the ninth sublayer 23c onto the substrate 10. Under this projection relationship, the sizes of the first pixel opening 20a, the second pixel opening 20b, and the third pixel opening 20c decrease from the pixel defining unit 20 toward the substrate 10.

[0070] In this embodiment, the second sublayer 21b, the third sublayer 21c, the fifth sublayer 22b, the sixth sublayer 22c, the eighth sublayer 23b, and the ninth sublayer 23c are hydrophilic. The hydrophilicity of the second sublayer 21b is less than that of the fifth sublayer 22b, and / or the hydrophilicity of the third sublayer 21c is less than that of the sixth sublayer 22c, and / or the hydrophilicity of the eighth sublayer 23b is less than that of the ninth sublayer 23c. In this embodiment, the hydrophilicity of the second sublayer 21b being less than that of the fifth sublayer 22b means that the contact angle formed after a polar solution or organic solution is spread on the second sublayer 21b is greater than the contact angle formed after it is spread on the fifth sublayer 22b. Similarly, the contact angle formed by a polar solution or organic solution after spreading on the third sublayer 21c is greater than the contact angle formed after spreading on the sixth sublayer 22c; the contact angle formed by a polar solution or organic solution after spreading on the eighth sublayer 23b is greater than the contact angle formed after spreading on the ninth sublayer 23c. The comparisons of hydrophilicity in this application follow the same principle.

[0071] This embodiment facilitates subsequent display panel fabrication by leveraging the hydrophobic properties of the first sub-layer 21a, the fourth sub-layer 22a, and the seventh sub-layer 23a. This ensures that the printed functional inks are confined beneath these layers, isolating the functional layers within the pixel openings of different colors. Simultaneously, the hydrophilic properties of the second sub-layer 21b, the third sub-layer 21c, the fifth sub-layer 22b, the sixth sub-layer 22c, the eighth sub-layer 23b, and the ninth sub-layer 23c allow for uniform distribution of printed functional inks within the first pixel opening 20a, the second pixel opening 20b, and the third pixel opening 20c. This results in higher film uniformity, which is beneficial for improving device performance and display effects.

[0072] In one embodiment, the host materials of the second sublayer 21b, the third sublayer 21c, the fifth sublayer 22b, the sixth sublayer 22c, the eighth sublayer 23b, and the ninth sublayer 23c are each independently selected from silicon nitride or silicon oxide. Although the host materials of the second sublayer 21b, the third sublayer 21c, the fifth sublayer 22b, the sixth sublayer 22c, the eighth sublayer 23b, and the ninth sublayer 23c may be selected from the same material, by doping the host materials differently, the second sublayer 21b, the third sublayer 21c, the fifth sublayer 22b, the sixth sublayer 22c, the eighth sublayer 23b, and the ninth sublayer 23c can be obtained with different hydrophilic properties.

[0073] In this embodiment, the hydrophilicity of the second sub-layer 21b is less than that of the third sub-layer 21c, the hydrophilicity of the fifth sub-layer 22b is less than that of the sixth sub-layer 22c, and the hydrophilicity of the eighth sub-layer 23b is less than that of the ninth sub-layer 23c. This facilitates the subsequent fabrication of the display panel, making it easier to first anchor the ink to the third sub-layer 21c, the sixth sub-layer 22c, and the ninth sub-layer 23c during ink drying, and then anchor it to the second sub-layer 21b, the fifth sub-layer 22b, and the eighth sub-layer 23b. This helps promote the uniform distribution and stability of the printing ink within the pixel, thereby improving the uniformity of the inner film layers of each pixel in the device and thus improving the light-emitting performance of the device.

[0074] This application also provides a display panel, which includes a display substrate. The structure related to the display substrate in this embodiment can be referred to the above embodiments, and will not be elaborated here.

[0075] refer to Figure 7 , combined Figure 1 , Figure 2 , Figure 4 and Figure 5 In the display panel of this embodiment, a first light-emitting unit 1 and a second light-emitting unit 2 are respectively provided in the first pixel opening 20a and the second pixel opening 20b. Adjacent first light-emitting units 1 and second light-emitting units 2 are connected through the auxiliary electrode. Specifically, the electrodes of adjacent first light-emitting units 1 and second light-emitting units 2 that are away from the substrate 10 are interconnected, covering the first defining portion 201 and communicating with the auxiliary electrode 30.

[0076] In this embodiment, an auxiliary electrode 30 is disposed between the first pixel opening 20a and the second pixel opening 20b. This allows the electrodes on one side of the first light-emitting unit 1 and the second light-emitting unit 2 in the first pixel opening 20a and the second pixel opening 20b to be connected to the auxiliary electrode 30. The introduction of the auxiliary electrode 30 can increase the current density on the electrode surface of the first light-emitting unit 1 and the second light-emitting unit 2, thereby improving the electrode polarization and helping to improve the light-emitting performance of the light-emitting device. Consequently, the light emission of large-size display panels is more uniform.

[0077] In one embodiment, the first defining portion 201 has an auxiliary opening 201a. Referring specifically to the above embodiment, in this embodiment, the electrodes on one side of the first light-emitting unit 1 and the second light-emitting unit 2 are interconnected and extend into the auxiliary opening 201a to communicate with the auxiliary electrode 30.

[0078] In one embodiment, such as Figure 7As shown, the display substrate is further provided with a plurality of third light-emitting units 3, and the pixel defining unit 20 is further provided with a plurality of third pixel openings 20c, in which the third light-emitting units 3 are disposed.

[0079] In one embodiment, such as Figure 7 As shown, the first light-emitting unit 1 includes a first electrode 101a, a first light-emitting layer 103a, and a second electrode 105a stacked together, and the second light-emitting unit 2 includes a third electrode 101b, a second light-emitting layer 103b, and a fourth electrode 105b stacked together, wherein the third electrode 101b and the fourth electrode 105b in adjacent first light-emitting units 1 and second light-emitting units 2 are connected through the auxiliary electrode.

[0080] Furthermore, the third light-emitting unit 3 includes a stacked fifth electrode 101c, a third light-emitting layer 107, and a sixth electrode 109.

[0081] Furthermore, a first hole functional layer 102a is disposed between the first electrode 101a and the first light-emitting layer 103a, and a first electron functional layer 104a is disposed between the second electrode 105a and the second light-emitting layer 103b; a second hole functional layer 102b is disposed between the third electrode 101b and the second light-emitting layer 103b, a second electron functional layer 104b is disposed between the fourth electrode 105b and the second light-emitting layer 103b, a third hole functional layer 106 is disposed between the fifth electrode 101c and the third light-emitting layer 107, and a third electron functional layer 108 is disposed between the sixth electrode 109 and the third light-emitting layer 107.

[0082] In this embodiment, the materials of the first hole functional layer 102a, the second hole functional layer 102b, and the third hole functional layer 106 are selected from at least one of TFB, CuPc, PVK, Poly-TPD, PFB, DNTPD, TCATA, TCCA, CBP, TPD, NPB, NPD, PEDOT:PSS, T·APC, MCC, F4-TCNQ, HATCN, 4,4',4'-tris(N-3-methylphenyl-N-phenylamino)triphenylamine, polyaniline, transition metal oxides, transition metal sulfides, transition metal tin compounds, doped graphene, undoped graphene, and C60.

[0083] In this embodiment, the materials of the first light-emitting layer 103a and the second light-emitting layer 103b include at least one of single-structure quantum dots and core-shell structure quantum dots. The materials of the single-structure quantum dots, the core material of the core-shell structure quantum dots, and the shell material of the core-shell structure quantum dots are respectively selected from at least one of group II-VI compounds, group IV-VI compounds, group III-V compounds, and group I-III-VI compounds. Among them, group II-VI compounds include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, and CdS. One or more of the following compounds: SnS, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, and HgZnSTe; and group IV-VI compounds including SnS, SnSe, Sn... One or more of the following compounds: Te, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe; and III-V compounds including GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, and AlNAs. One or more of AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, and InAlPSb, and at least one of Group I-III-VI compounds including CuInS2, CuInSe2, and AgInS2;

[0084] In this embodiment, the material of the third light-emitting layer 107 includes at least one of the following: 4,4'-bis(N-carbazole)-1,1'-biphenyl:tris[2-(p-tolyl)pyridine-C2,N)iridium(III), 4,4',4”-tris(carbazole-9-yl)triphenylamine:tris[2-(p-tolyl)pyridine-C2,N)iridium, diaromatic anthracene derivatives, stilbene aromatic derivatives, pyrene derivatives, fluorene derivatives, TBPe fluorescent materials, TTPX fluorescent materials, TBRb fluorescent materials and DBP fluorescent materials, polyacetylene and its derivatives, poly(p-phenylene) and its derivatives, polythiophene and its derivatives, and polyfluorene and its derivatives.

[0085] In this embodiment, the first electronic functional layer 104a, the second electronic functional layer 104b, and the third electronic functional layer 108 include an electron transport layer. The material of the electron transport layer includes inorganic materials and / or organic materials. The inorganic material is selected from one or more of the following: doped or undoped zinc oxide, barium oxide, aluminum oxide, nickel oxide, titanium oxide, tin oxide, tantalum oxide, zirconium oxide, nickel oxide, lithium titanium oxide, zinc aluminum oxide, zinc manganese oxide, zinc tin oxide, zinc lithium oxide, indium tin oxide, cadmium sulfide, zinc sulfide, molybdenum sulfide, tungsten sulfide, copper sulfide, zinc tin sulfide, indium phosphide, gallium phosphide, copper indium sulfide, copper gallium sulfide, and barium titanate. The doped element includes one or more of aluminum, magnesium, lithium, manganese, yttrium, lanthanum, copper, nickel, zirconium, cerium, and gadolinium, and the mass percentage of the doped element is 1% to 10%. The organic material is selected from one or more of the following: quinoxaline compounds, imidazole compounds, triazine compounds, fluorene-containing compounds, and hydroxyquinoline compounds.

[0086] In this embodiment, the first electrode 101a, the second electrode 105a, the third electrode 101b, the fourth electrode 105b, the fifth electrode 101c, and the sixth electrode 109 are each independently selected from one or more of metal electrodes, silicon-carbon electrodes, doped or undoped metal oxide electrodes, and composite electrodes; wherein, the material of the metal electrode is selected from at least one of Al, Ag, Cu, Mo, Au, Ba, Ca, and Mg; the material of the silicon-carbon electrode is selected from at least one of silicon, graphite, carbon nanotubes, graphene, and carbon fibers; the material of the doped or undoped metal oxide electrode is selected from at least one of silicon, graphite, carbon nanotubes, graphene, and carbon fibers; The material of the compound electrode is selected from at least one of ITO, FTO, ATO, AZO, GZO, IZO, MZO, and AMO; the material of the composite electrode is selected from at least one of AZO / Ag / AZO, AZO / Al / AZO, ITO / Ag / ITO, ITO / Al / ITO, ZnO / Ag / ZnO, ZnO / Al / ZnO, TiO2 / Ag / TiO2, TiO2 / Al / TiO2, ZnS / Ag / ZnS, ZnS / Al / ZnS, TiO2 / Ag / TiO2, and TiO2 / Al / TiO2.

[0087] See Figure 8 As shown, based on Figure 4 and Figure 5 The display substrate shown in this application provides a flowchart of the fabrication process of the aforementioned display panel, including:

[0088] S31. A display substrate is provided. The display substrate includes a first electrode 101a, a third electrode 101b, and a fifth electrode 101c.

[0089] S32. A first functional solution and a second functional solution are printed in the first pixel opening and the second pixel opening in the display substrate, respectively, to form a first hole functional layer and a second hole functional layer, respectively. A third functional solution is printed in the third pixel opening to form a third hole functional layer.

[0090] The first hole function layer, the second hole function layer, and the third hole function layer include a hole injection layer and / or a hole transport layer. Figure 9 The diagram illustrates the state of printing functional layers on a display substrate. Taking the first hole functional layer 102a and the second hole functional layer 102b as examples, it can be seen from the figure that due to the hydrophilicity of the second sub-layer 21b, the third sub-layer 21c, the fifth sub-layer 22b, and the sixth sub-layer 22c, with the third sub-layer 21c and the sixth sub-layer 22c having higher hydrophilicity, combined with the hydrophobic first sub-layer 21a, the fourth sub-layer 22a, and the seventh sub-layer 23a, the liquid film 40 of the first functional layer formed by the ink printed in the first pixel opening 20a and the second pixel opening 20b will not overflow. This prevents the functional layers of different color pixel openings from communicating with each other. During the printing process, it avoids the situation where the functional layers of different color pixels directly contact each other in a wet state, which would lead to the mixing of different colors, thereby improving the pixel purity and color accuracy of the device.

[0091] S33. Print a first quantum dot solution and a second quantum dot solution onto the first hole functional layer and the second hole functional layer of the first pixel opening and the second pixel opening, respectively, to form a first light-emitting layer and a second light-emitting layer, respectively. Print an organic solution onto the third hole functional layer of the third pixel opening to form a third light-emitting layer.

[0092] S34. A fourth functional material and a fifth functional material are printed on the first light-emitting layer and the second light-emitting layer of the first pixel opening and the second pixel opening, respectively, to form a first electronic functional layer and a second electronic functional layer.

[0093] The first electronic functional layer 104a and the second electronic functional layer 104b each independently include an electron transport layer. In this embodiment, the electron transport layer is prepared by inkjet printing technology.

[0094] In some embodiments, the display substrate is further subjected to ultraviolet light irradiation before the second electronic functional layer 104b is printed to reduce the hydrophobicity of the first sublayer 21a.

[0095] In this embodiment, reducing the hydrophobicity of the first sub-layer 21a is to limit the ink overflow from the first pixel opening 20a and the second pixel opening 20b to the third pixel opening 20c, so as to avoid the mixing of pixels of different colors, reduce interference between pixels, help optimize the color distribution and visual effect of the device, and improve the display effect of the device.

[0096] In this embodiment, the ultraviolet light irradiation wavelength is 200–275 nm and the optical power is 2–50 Mw / cm². 2 The irradiation time is 10 to 600 seconds.

[0097] In this embodiment, the ultraviolet light energy within this irradiation wavelength range is relatively high, which can better excite the photosensitive material on the display substrate to undergo photochemical reactions, thereby improving production efficiency. By setting the above-mentioned light power and irradiation time parameter range, the influence of ultraviolet light on the display substrate can be more precisely controlled. This helps to avoid over- or under-processing of ultraviolet light, ensuring the stability of each functional layer, and also improving the adhesion of the display substrate surface, thereby ensuring a tight bond between each functional layer and improving the reliability and durability of the device.

[0098] Optionally, the irradiation wavelength is selected from any one or a range formed by two of the following: 200nm, 205nm, 210nm, 215nm, 220nm, 225nm, 230nm, 235nm, 240nm, 245nm, 250nm, 255nm, 260nm, 265nm, 270nm, and 275nm.

[0099] Optionally, the optical power is selected from 2 Mw / cm². 2 5Mw / cm 2 10Mw / cm 2 15Mw / cm 2 20Mw / cm 2 25Mw / cm 2 30Mw / cm 2 35Mw / cm 2 40Mw / cm 2 45Mw / cm 2 50Mw / cm 2 The range formed by any one or both of them.

[0100] Optionally, the irradiation time is selected from any one or a range formed by two of the following: 10s, 50s, 100s, 150s, 200s, 250s, 300s, 350s, 400s, 450s, 500s, 550s, and 600s.

[0101] S35. Print a second electrode and a fourth electrode on the first electronic functional layer and the second electronic functional layer respectively, so that the second electrode and the fourth electrode are connected and cover the first electronic functional layer, the second electronic functional layer and the first defining part, and are connected to the auxiliary electrode in the first defining part.

[0102] The second electrode 105a and the fourth electrode 105b were printed using inkjet printing of nano-metallic materials. Figure 10 The diagram shown illustrates the state of the display substrate during the printing of the second electrode 105a and the fourth electrode 105b according to an embodiment of this application. Specifically, nano-silver ink is inkjet-printed over the entire area of ​​the first pixel opening 20a, the second pixel opening 20b, and the first defining portion 201. By controlling the printing volume, the ink completely wets the first defining portion 201 and the auxiliary electrode 30, forming a first cathode liquid film 50. This film is then vacuum-dried to obtain the interconnected second electrode 105a and the fourth electrode 105b. This connects the cathodes of the first quantum dot pixel unit and the second quantum dot pixel unit into a single unit, which helps to increase the current density on the cathode surface. The printing volume refers to the volume of the printed ink, and the printing volume is 1–2 pL. In this embodiment, the volume of printing ink is continuously increased until the ink completely soaks the target area, which is recorded as 1 pL. The volume of printing ink is then increased until the ink overflows the target area, which is recorded as 2 pL. The target area can be the opening area of ​​each pixel of different colors printed. By controlling the volume of printing ink between 1 and 2 pL, ink overflow due to excessive ink volume can be effectively prevented, thus ensuring the display effect of the device.

[0103] Optionally, the printing volume is selected from the range formed by 1 pL, 2 pL, or both.

[0104] Furthermore, the vacuum drying includes vacuuming and baking processes, wherein the stage temperature for vacuuming is 20–50°C; the condenser plate temperature for vacuuming is 5–30°C; the temporary vacuum pressure for vacuuming is 0.0001–500 tor; the vacuuming time is 1–20 min; and the baking temperature is 120–250°C.

[0105] Optionally, the stage temperature is selected from any one or a range formed by two of 20°C, 25°C, 30°C, 35°C, 40°C, 45°C, and 50°C.

[0106] Optionally, the temperature of the condenser plate is selected from any one or a range formed by two of 5°C, 10°C, 15°C, 20°C, 25°C, and 30°C.

[0107] Optionally, the vacuum temporary pressure is selected from any one or a range formed by two of 0.0001tor, 0.01tor, 0.1tor, 1tor, 50tor, 100tor, 150tor, 200tor, 250tor, 300tor, 350tor, 400tor, 450tor, and 500tor.

[0108] Optionally, the vacuuming time is selected from any one or a range formed by two of the following: 1 min, 2 min, 4 min, 6 min, 8 min, 10 min, 12 min, 14 min, 16 min, 18 min, and 20 min.

[0109] Optionally, the baking temperature is selected from any one or a range formed by two of 120°C, 150°C, 200°C, and 250°C.

[0110] refer to Figure 11 As shown in the vacuuming process curves of each functional layer in the display panel provided in this application embodiment, it can be seen that the vacuum temporary pressure of HTL (hole transport layer) does not change much within a vacuuming time of 400s. When the vacuuming time reaches 400s, the vacuum temporary pressure drops sharply from less than 100tor to 0.0001tor. For HIL (hole injection layer), when vacuuming begins, the corresponding vacuum temporary pressure decreases sharply from 1000tor to between 0.01 and 0.1tor with the increase of time, and briefly rises to 0.1tor at about 200s. Until the vacuuming time is close to 600s, the vacuum temporary pressure drops from 0.1tor to 0.0001tor. For EML (emissive layer), the corresponding vacuum temporary pressure also does not change much within a vacuuming time of 400s. When the vacuuming time reaches 400s, the vacuum temporary pressure drops sharply from more than 100tor to 0.0001tor.

[0111] In this embodiment, since the first light-emitting unit 1 and the second light-emitting unit 2 remain independent before vacuum drying, the resolution and clarity of the display substrate are guaranteed during the printing process. Furthermore, after vacuum drying, connecting the first light-emitting unit 1 and the second light-emitting unit 2 of the display substrate further ensures the continuity and integrity of the device's display effect. When the boundaries of different color pixels remain clear and accurate, it ensures that different colors can be accurately presented in the designated positions when the display substrate displays images, thereby enhancing the overall display effect of the device. Moreover, the dried functional layer usually has higher hardness and structural stability, which helps to enhance the mechanical strength and durability of the entire device and improve its performance.

[0112] S36. Sequentially deposit a sixth functional material and a cathode material on the third light-emitting layer of the third pixel opening to obtain a third electronic functional layer and a sixth electrode.

[0113] The vapor deposition process uses a non-patterned mask, which can eliminate complex pattern design and alignment processes while ensuring the accuracy of vapor deposition, thereby simplifying the vapor deposition process and improving device production efficiency.

[0114] Furthermore, the vapor deposition in this step can also occur in the first pixel opening 20a and the second pixel opening 20b, thereby forming the third electronic functional layer 108 and the sixth electrode 109 in the first light-emitting unit 1 and the second light-emitting unit 2. However, the third electronic functional layer 108 and the sixth electrode 109 do not participate in the current flow of the device. By using the same unpatterned mask for vapor deposition, the additional cost and time of making different masks for each color are avoided, thus improving the device production efficiency. Since the third electronic functional layer 108 and the sixth electrode 109 in the first light-emitting unit 1 and the second light-emitting unit 2 do not participate in the current flow of the device, while the current still flows through the organic pixel unit, the display effect of the device can still be guaranteed to remain unaffected while improving production efficiency.

[0115] This application also provides a display device, including the display substrate or the display panel described in the above embodiments.

[0116] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A display substrate, characterized in that, It includes a substrate and a pixel defining unit disposed on one side of the substrate, the pixel defining unit having a plurality of first pixel openings and a plurality of second pixel openings; An auxiliary electrode is provided between the first pixel opening and the second pixel opening.

2. The display substrate according to claim 1, characterized in that, A plurality of first pixel openings are arranged sequentially along a first direction to form a first pixel group, and a plurality of second pixel openings are arranged sequentially along the first direction to form a second pixel group. The plurality of first pixel groups and the plurality of second pixel groups are arranged cyclically along a second direction. The pixel defining unit includes a first defining portion, which is located between the first pixel group and the second pixel group. The first defining portion has an auxiliary opening, and the auxiliary electrode is disposed in the auxiliary opening. And / or, The pixel defining unit further has a plurality of third pixel openings, and the pixel defining unit further includes a second defining portion, the second defining portion being located between the first pixel opening and the third pixel opening, and / or between the second pixel opening and the third pixel opening; and / or, The pixel defining unit further includes a third defining portion and a fourth defining portion, which are sequentially and spaced apart between two adjacent first pixel openings and sequentially and spaced apart between two adjacent second pixel openings.

3. The display substrate according to claim 2, characterized in that, A plurality of the third pixel openings are arranged sequentially along a first direction to form a third pixel group, and a plurality of the first pixel groups, a plurality of the second pixel groups, and a plurality of the third pixel groups are arranged sequentially and cyclically along a second direction; the second defining portion is located between the first pixel group and the third pixel group, and / or the second defining portion is located between the second pixel group and the third pixel group; and / or, Relative to the substrate, the height of the upper surface of the auxiliary electrode is less than the height of the upper surface of the first defining portion; and / or, Relative to the substrate, the height of the upper surface of the first defining portion is less than the height of the upper surface of the second defining portion; and / or, Relative to the substrate, the height of the upper surface of the third defining portion is less than the height of the upper surface of the first defining portion; and / or, Relative to the substrate, the height of the upper surface of the fourth defining portion is less than or equal to the height of the upper surface of the first defining portion; and / or, The sides of the first and second defining portions away from the substrate are hydrophobic, and the hydrophobicity of the side of the first defining portion away from the substrate is less than the hydrophobicity of the side of the second defining portion away from the substrate; and / or, The third defining portion is hydrophilic; and / or, The hydrophobicity of the side of the fourth defining portion away from the substrate; and / or, The second defining portion is also located between two adjacent openings of the third pixel.

4. The display substrate according to claim 3, characterized in that, The height of the upper surface of the first defining portion relative to the substrate is 600–1800 nm; and / or, The height of the upper surface of the second defining portion relative to the substrate is 1000–2000 nm; and / or, The height of the upper surface of the auxiliary electrode relative to the substrate is 480–1710 nm; and / or, Relative to the substrate, the height of the upper surface of the first defining portion is 60% to 90% of the height of the upper surface of the second defining portion; and / or, Relative to the substrate, the height of the upper surface of the auxiliary electrode is 80% to 95% of the height of the upper surface of the first defining portion; and / or, In the second direction, the width of the upper surface of the first defining portion is 2–20 μm; and / or, In the second direction, the width of the upper surface of the second defining portion is 5–30 μm; and / or, In the second direction, the width of the upper surface of the auxiliary electrode is 2 to 10 μm.

5. The display substrate according to claim 3, characterized in that, The first defining portion, the second defining portion, and the fourth defining portion are all multilayer structures; from the pixel defining unit toward the substrate, the first defining portion includes a first sublayer, a second sublayer, and a third sublayer stacked sequentially; the second defining portion includes a fourth sublayer, a fifth sublayer, and a sixth sublayer stacked sequentially; and the fourth defining portion includes a seventh sublayer, an eighth sublayer, and a ninth sublayer stacked sequentially. Wherein, the orthographic projection of the first sublayer onto the substrate lies within the orthographic projection of the second sublayer onto the substrate, and the orthographic projection of the second sublayer onto the substrate lies within the orthographic projection of the third sublayer onto the substrate; and / or, The orthographic projection of the fourth sublayer onto the substrate lies within the orthographic projection of the fifth sublayer onto the substrate, and the orthographic projection of the fifth sublayer onto the substrate lies within the orthographic projection of the sixth sublayer onto the substrate; and / or, The orthographic projection of the seventh sublayer onto the substrate lies within the orthographic projection of the eighth sublayer onto the substrate, and the orthographic projection of the eighth sublayer onto the substrate lies within the orthographic projection of the ninth sublayer onto the substrate; and / or, Relative to the substrate, the height of the upper surface of the first sub-layer is less than the height of the upper surface of the fourth sub-layer, and the height of the upper surface of the seventh sub-layer is less than or equal to the height of the upper surface of the first sub-layer; and / or, The second sublayer, the third sublayer, the fifth sublayer, the sixth sublayer, the eighth sublayer, and the ninth sublayer are hydrophilic, with the hydrophilicity of the second sublayer being less than that of the fifth sublayer, and / or the hydrophilicity of the third sublayer being less than that of the sixth sublayer, and / or the hydrophilicity of the eighth sublayer being less than that of the ninth sublayer.

6. The display substrate according to claim 5, characterized in that, The main material of the first sublayer, the fourth sublayer and / or the seventh sublayer is selected from at least one of polyimide materials, PMMA and organosilicon. Optionally, when the first sublayer and the fourth sublayer are the same material, the first sublayer is obtained by ultraviolet treatment. And / or, The host materials of the second sublayer, the third sublayer, the fifth sublayer, the sixth sublayer, the eighth sublayer, and the ninth sublayer are each independently selected from at least one of silicon nitride or silicon oxide; and / or, The auxiliary electrode is made of silver or gold.

7. A display panel, characterized in that, The display panel includes a display substrate; The display substrate includes a substrate and a pixel defining unit disposed on one side of the substrate. The pixel defining unit has a plurality of first pixel openings and a plurality of second pixel openings, and an auxiliary electrode is disposed between the first pixel openings and the second pixel openings. The first pixel opening and the second pixel opening are respectively provided with a first light-emitting unit and a second light-emitting unit, and adjacent first light-emitting units and second light-emitting units are connected through the auxiliary electrode.

8. The display panel according to claim 7, characterized in that, The first light-emitting unit includes a stacked first electrode, a first light-emitting layer, and a second electrode; the second light-emitting unit includes a stacked third electrode, a second light-emitting layer, and a fourth electrode, wherein the third electrode and the fourth electrode in adjacent first and second light-emitting units are connected via the auxiliary electrode; and / or A plurality of first pixel openings are arranged sequentially along a first direction to form a first pixel group, and a plurality of second pixel openings are arranged sequentially along the first direction to form a second pixel group. The plurality of first pixel groups and the plurality of second pixel groups are arranged cyclically along a second direction. The pixel defining unit includes a first defining portion located between the first pixel group and the second pixel group. The first defining portion has an auxiliary opening, and an auxiliary electrode is disposed within the auxiliary opening. And / or... The pixel defining unit further has a plurality of third pixel openings, each third pixel opening containing a third light-emitting unit. The pixel defining unit also includes a second defining portion located between the first pixel opening and the third pixel opening, and / or between the second pixel opening and the third pixel opening; and / or The pixel defining unit further includes a third defining portion and a fourth defining portion, which are sequentially and spaced apart between two adjacent first pixel openings and sequentially and spaced apart between two adjacent second pixel openings.

9. The display panel according to claim 8, characterized in that, It also includes at least one of the following features (1) to (10): (1) The third light-emitting unit includes a stacked fifth electrode, a third light-emitting layer and a sixth electrode; (2) A plurality of the third pixel openings are arranged sequentially along a first direction to form a third pixel group, and a plurality of the first pixel group, a plurality of the second pixel group and a plurality of the third pixel group are arranged sequentially and cyclically along a second direction, and the second defining portion is located between the first pixel group and the third pixel group, and / or between the second pixel group and the third pixel group; (3) The height of the upper surface of the auxiliary electrode is less than the height of the upper surface of the first defining portion relative to the substrate; and / or, (4) Relative to the substrate, the height of the upper surface of the first defining portion is less than the height of the upper surface of the second defining portion; and / or, (5) The height of the upper surface of the third defining portion is less than the height of the upper surface of the first defining portion relative to the substrate; (6) The height of the upper surface of the fourth defining portion relative to the substrate is less than or equal to the height of the upper surface of the first defining portion; (7) The side of the first defining portion and the second defining portion away from the substrate is hydrophobic, and the hydrophobicity of the side of the first defining portion away from the substrate is less than the hydrophobicity of the side of the second defining portion away from the substrate. (8) The third defining portion and the fourth defining portion are hydrophilic; (9) The second defining portion is also located between two adjacent third pixel openings; (10) The first defining part, the second defining part, and the fourth defining part are all multi-layer structures; the first defining part includes a first sub-layer, a second sub-layer, and a third sub-layer stacked in sequence; the second defining part includes a fourth sub-layer, a fifth sub-layer, and a sixth sub-layer stacked in sequence; the fourth defining part includes a seventh sub-layer, an eighth sub-layer, and a ninth sub-layer stacked in sequence.

10. The display panel according to claim 9, characterized in that, The height of the upper surface of the first defining portion relative to the substrate is 600–1800 nm; and / or, The height of the upper surface of the second defining portion relative to the substrate is 1000–2000 nm; and / or, The height of the upper surface of the auxiliary electrode relative to the substrate is 480–1710 nm; and / or, Relative to the substrate, the height of the upper surface of the first defining portion is 60% to 90% of the height of the upper surface of the second defining portion; and / or, Relative to the substrate, the height of the upper surface of the auxiliary electrode is 80% to 95% of the height of the upper surface of the first defining portion; and / or, In the second direction, the width of the upper surface of the first defining portion is 2–20 μm; and / or, In the second direction, the width of the upper surface of the second defining portion is 5–30 μm; and / or, In the second direction, the width of the upper surface of the auxiliary electrode is 2–10 μm; and / or, The orthographic projection of the first sublayer onto the substrate lies within the orthographic projection of the second sublayer onto the substrate, and the orthographic projection of the second sublayer onto the substrate lies within the orthographic projection of the third sublayer onto the substrate. And / or, The orthographic projection of the fourth sublayer onto the substrate lies within the orthographic projection of the fifth sublayer onto the substrate, and the orthographic projection of the fifth sublayer onto the substrate lies within the orthographic projection of the sixth sublayer onto the substrate. And / or, The orthographic projection of the seventh sublayer onto the substrate lies within the orthographic projection of the eighth sublayer onto the substrate, and the orthographic projection of the eighth sublayer onto the substrate lies within the orthographic projection of the ninth sublayer onto the substrate. And / or, Relative to the substrate, the height of the upper surface of the fourth sub-layer is greater than the height of the upper surface of the first sub-layer, and the height of the upper surface of the seventh sub-layer is less than or equal to the height of the upper surface of the first sub-layer; And / or, The second, third, fifth, sixth, eighth, and ninth sublayers are hydrophilic, wherein the hydrophilicity of the second sublayer is less than that of the fifth sublayer, and / or the hydrophilicity of the third sublayer is less than that of the sixth sublayer, and / or the hydrophilicity of the eighth sublayer is less than that of the ninth sublayer; and / or, The main material of the first sublayer, the fourth sublayer and / or the seventh sublayer is selected from at least one of polyimide materials, PMMA and organosilicon. Optionally, when the first sublayer and the fourth sublayer are the same material, the first sublayer is obtained by ultraviolet treatment. And / or, The host materials of the second sublayer, the third sublayer, the fifth sublayer, the sixth sublayer, the eighth sublayer, and the ninth sublayer are each independently selected from at least one of silicon nitride or silicon oxide; and / or, The auxiliary electrode is made of silver or gold.

11. The display panel according to claim 10, characterized in that, A first hole functional layer is disposed between the first electrode and the first light-emitting layer; a first electron functional layer is disposed between the second electrode and the second light-emitting layer; a second hole functional layer is disposed between the third electrode and the second light-emitting layer; a second electron functional layer is disposed between the fourth electrode and the second light-emitting layer; a third hole functional layer is disposed between the fifth electrode and the third light-emitting layer; and a third electron functional layer is disposed between the sixth electrode and the third light-emitting layer. Wherein, the materials of the first hole functional layer, the second hole functional layer, and the third hole functional layer are each independently selected from at least one of TFB, CuPc, PVK, Poly-TPD, PFB, DNTPD, TCATA, TCCA, CBP, TPD, NPB, NPD, PEDOT:PSS, T·APC, MCC, F4-TCNQ, HATCN, 4,4',4'-tris(N-3-methylphenyl-N-phenylamino)triphenylamine, polyaniline, transition metal oxides, transition metal sulfides, transition metal tin compounds, doped graphene, undoped graphene, and C60; and / or, The materials of the first light-emitting layer and the second light-emitting layer each independently include at least one of single-structure quantum dots and core-shell structure quantum dots. The material of the single-structure quantum dots, the core material of the core-shell structure quantum dots, and the shell material of the core-shell structure quantum dots are respectively selected from at least one of group II-VI compounds, group IV-VI compounds, group III-V compounds, and group I-III-VI compounds. Among them, group II-VI compounds include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, and CdS. One or more of the following compounds: Te, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, and HgZnSTe; and group IV-VI compounds including SnS, SnSe, SnTe, and Pb. One or more of S, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe, and III-V compounds including GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, and AlN One or more of Sb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, and InAlPSb, and at least one of Group I-III-VI compounds including CuInS2, CuInSe2, and AgInS2;The material of the third luminescent layer includes at least one of the following: 4,4'-bis(N-carbazole)-1,1'-biphenyl:tris[2-(p-tolyl)pyridine-C2,N)iridium(III), 4,4',4”-tris(carbazole-9-yl)triphenylamine:tris[2-(p-tolyl)pyridine-C2,N)iridium, diaromatic anthracene derivatives, stilbene aromatic derivatives, pyrene derivatives, fluorene derivatives, TBPe fluorescent materials, TTPX fluorescent materials, TBRb fluorescent materials and DBP fluorescent materials, polyacetylene and its derivatives, poly(p-phenylene) and its derivatives, polythiophene and its derivatives, and polyfluorene and its derivatives; and / or, Each of the first, second, and third electronic functional layers independently includes an electron transport layer, the material of which includes inorganic and / or organic materials; the inorganic material is selected from one or more of the following: doped or undoped zinc oxide, barium oxide, aluminum oxide, nickel oxide, titanium oxide, tin oxide, tantalum oxide, zirconium oxide, nickel oxide, lithium titanium oxide, zinc aluminum oxide, zinc manganese oxide, zinc tin oxide, zinc lithium oxide, indium tin oxide, cadmium sulfide, zinc sulfide, molybdenum sulfide, tungsten sulfide, copper sulfide, zinc tin sulfide, indium phosphide, gallium phosphide, copper indium sulfide, copper gallium sulfide, and barium titanate; the doped element includes one or more of aluminum, magnesium, lithium, manganese, yttrium, lanthanum, copper, nickel, zirconium, cerium, and gadolinium, with a doping mass percentage of 1% to 10%; the organic material is selected from one or more of the following: quinoxaline compounds, imidazole compounds, triazine compounds, fluorene-containing compounds, and hydroxyquinoline compounds; and / or... The first electrode, the second electrode, the third electrode, the fourth electrode, the fifth electrode, and the sixth electrode are each independently selected from one or more of the following: metal electrode, silicon-carbon electrode, doped or undoped metal oxide electrode, and composite electrode; wherein, the material of the metal electrode is selected from at least one of Al, Ag, Cu, Mo, Au, Ba, Ca, and Mg; the material of the silicon-carbon electrode is selected from at least one of silicon, graphite, carbon nanotubes, graphene, and carbon fiber; and the material of the doped or undoped metal oxide electrode is selected from ITO, F... The composite electrode material is selected from at least one of TO, ATO, AZO, GZO, IZO, MZO, and AMO; the composite electrode material is selected from at least one of AZO / Ag / AZO, AZO / Al / AZO, ITO / Ag / ITO, ITO / Al / ITO, ZnO / Ag / ZnO, ZnO / Al / ZnO, TiO2 / Ag / TiO2, TiO2 / Al / TiO2, ZnS / Ag / ZnS, ZnS / Al / ZnS, TiO2 / Ag / TiO2, and TiO2 / Al / TiO2.

12. A display device, characterized in that, It includes the display substrate as described in any one of claims 1 to 6, or the display panel as described in any one of claims 7 to 11.

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