Array substrate, preparation method of array substrate and display panel

Abstract

The application provides an array substrate, a preparation method of the array substrate and a display panel. A base layer is arranged on a substrate, the base layer has a plurality of opening regions, an organic light emitting unit is arranged in the opening region, at least part of a water and oxygen absorbing structure is arranged in the base layer and is arranged adjacent to the organic light emitting unit, the water and oxygen absorbing structure is used for absorbing water vapor generated in an organic layer of the organic light emitting unit and blocking external water vapor from entering the organic light emitting unit, thereby avoiding reaction between an electrode of the organic light emitting unit and water vapor and oxygen, and avoiding reaction between a hole transport layer, an electron transport layer and other film layers in the organic light emitting unit and oxygen and water vapor, causing failure of an OLED device in the display panel, and improving stability of the OLED device.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to an array substrate, a method for fabricating the array substrate, and a display panel. Background Technology

[0002] Organic light-emitting diodes (OLEDs) have gradually become the mainstream technology for display devices due to their advantages such as self-illumination, uniform image quality, short response time, and low power consumption. In OLED devices, the electrodes of the light-emitting units are typically made of highly reactive metals, which readily react with moisture and oxygen. Furthermore, the hole transport layer, electron transport layer, and other film layers also react with oxygen and moisture, causing OLED device failure. Therefore, reducing the impact of moisture and oxygen on the electrodes, hole transport layer, and electron transport layer of the light-emitting units, and improving the stability of OLED devices, has become a crucial technical problem that needs to be solved. Summary of the Invention

[0003] This application provides an array substrate, a method for fabricating the array substrate, and a display panel for reducing the impact of water vapor, oxygen, etc. on OLED devices and improving the stability of OLED devices.

[0004] In a first aspect, an array substrate provided in an embodiment of this application includes:

[0005] substrate;

[0006] A base layer is disposed on the substrate, and the base layer has multiple opening regions;

[0007] An organic light-emitting unit is disposed in the opening region; and

[0008] At least one water-oxygen absorption structure is provided, at least part of which is disposed in the substrate layer and adjacent to the organic light-emitting unit. The water-oxygen absorption structure is used to absorb water vapor generated by the organic light-emitting layer in the organic light-emitting unit and to block external water vapor from entering the organic light-emitting unit.

[0009] The array substrate provided in this application embodiment is designed with a base layer disposed on the substrate, the base layer having multiple opening regions; organic light-emitting units are disposed in the opening regions; at least part of the water-oxygen absorption structure is disposed in the base layer and adjacent to the organic light-emitting units. The water-oxygen absorption structure is used to absorb water vapor generated by the organic layer in the organic light-emitting units and to block external water vapor from entering the organic light-emitting units, thereby preventing the electrodes of the organic light-emitting units from reacting with water vapor and oxygen; it also prevents the hole transport layer, electron transport layer and other film layers in the organic light-emitting units from reacting with oxygen and water vapor, causing the OLED devices in the display panel to fail, thereby improving the stability of the OLED devices.

[0010] In one optional embodiment, the water-oxygen absorption structure is a porous structure, and the material of the water-oxygen absorption structure includes a metal-organic framework material.

[0011] In one optional embodiment, the array substrate further includes a passivation layer disposed between the base layer and the substrate, the water-oxygen absorption structure being columnar, and a portion of the water-oxygen absorption structure extending into the passivation layer.

[0012] In one alternative embodiment, the dimension of the end of the water-oxygen absorption structure located in the passivation layer is larger than the dimension of the end of the water-oxygen absorption structure located in the substrate layer.

[0013] In one optional embodiment, the organic light-emitting unit includes a first electrode layer, an organic light-emitting layer, and a second electrode layer disposed sequentially. The first electrode layer is located between the substrate and the second electrode layer. A portion of the second electrode layer extends out of the opening area and is disposed on the side of the substrate layer away from the substrate. One end of the water-oxygen absorption structure abuts against the portion of the second electrode layer extending out of the opening area. The water-oxygen absorption structure is disposed at a distance from the first electrode layer.

[0014] In one optional embodiment, at least one end of the organic light-emitting layer is projected in the thickness direction of the substrate layer outside the region where the first electrode layer is located, and at least one end of the organic light-emitting layer is located near or connected to the water-oxygen absorption structure.

[0015] In one optional embodiment, the water-oxygen absorption structure includes a main body and an extension that are interconnected. The main body is disposed along the thickness direction of the substrate layer. One end of the extension is connected to the main body, and the other end of the extension extends to a position close to or connected to the organic light-emitting layer in the organic light-emitting unit.

[0016] In one optional embodiment, the water-oxygen absorption structure is in the shape of a ring column, and the water-oxygen absorption structure is arranged to surround the opening area; or, a plurality of water-oxygen absorption structures arranged at intervals are arranged around the periphery of the opening area.

[0017] Secondly, this application provides a method for fabricating an array substrate, comprising:

[0018] A substrate layer is formed on the substrate;

[0019] At least one receiving groove and a plurality of opening areas are formed on the base layer, wherein the receiving groove is disposed adjacent to the opening areas;

[0020] A first electrode layer is formed in the opening area, and a water-oxygen absorption structure is formed in the receiving tank.

[0021] An organic light-emitting layer and a second electrode layer are formed in the opening area to form an organic light-emitting unit. The water-oxygen absorption structure is used to absorb water vapor generated by the organic light-emitting layer in the organic light-emitting unit and to block external water vapor from entering the organic light-emitting unit.

[0022] The array substrate provided in this application embodiment is designed to form a base layer on the substrate; at least one accommodating groove and multiple opening regions are formed on the base layer, with the accommodating groove disposed adjacent to the opening regions; a first electrode layer is formed in the opening regions, and a water-oxygen absorption structure is formed in the accommodating groove; an organic light-emitting layer and a second electrode layer are formed in the opening regions to form organic light-emitting units in the opening regions. The water-oxygen absorption structure is used to absorb water vapor generated by the organic layer in the organic light-emitting unit and to block external water vapor from entering the organic light-emitting unit, thereby preventing the electrodes of the organic light-emitting unit from reacting with water vapor and oxygen; it also prevents the hole transport layer, electron transport layer and other film layers in the organic light-emitting unit from reacting with oxygen and water vapor, causing OLED device failure, and improving the stability of the OLED device.

[0023] Thirdly, an embodiment of this application provides a display panel including the array substrate described above. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0025] Figure 1 This is a schematic diagram of the structure of the display panel provided in an embodiment of this application;

[0026] Figure 2 yes Figure 1 A partial structural diagram of the array substrate;

[0027] Figure 3 This is a partial schematic diagram of the absorption of water and oxygen by the first water and oxygen absorption structure in the array substrate provided in the embodiments of this application;

[0028] Figure 4 This is a schematic diagram of a structure of an organic light-emitting unit provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the second water and oxygen absorption structure in the array substrate provided in the embodiments of this application;

[0030] Figure 6 This is a schematic diagram of the third water and oxygen absorption structure in the array substrate provided in the embodiments of this application;

[0031] Figure 7This is a schematic diagram of the first connection method between the water and oxygen absorption structure and the organic light-emitting layer in the array substrate provided in the embodiments of this application;

[0032] Figure 8 This is a schematic diagram of the second connection method between the water and oxygen absorption structure and the organic light-emitting layer in the array substrate provided in the embodiments of this application;

[0033] Figure 9 This is a schematic diagram of the third connection method between the water and oxygen absorption structure and the organic light-emitting layer in the array substrate provided in the embodiments of this application;

[0034] Figure 10 This is a top view schematic diagram of the first type of water and oxygen absorption structure in the array substrate provided in the embodiments of this application;

[0035] Figure 11 This is a top view schematic diagram of the second type of water and oxygen absorption structure in the array substrate provided in the embodiments of this application;

[0036] Figure 12 This is a top view schematic diagram of the third type of water and oxygen absorption structure in the array substrate provided in the embodiments of this application;

[0037] Figure 13 This is a schematic diagram of the water and oxygen absorption structure, pixel definition layer, and organic light-emitting unit in the array substrate provided in this application embodiment;

[0038] Figure 14 This is a schematic diagram of the water and oxygen absorption structure and another organic light-emitting unit in the array substrate provided in the embodiments of this application;

[0039] Figure 15 This is a flowchart of the method for fabricating an array substrate provided in an embodiment of this application;

[0040] Figure 16 This is a process diagram of one fabrication of an array substrate provided in an embodiment of this application;

[0041] Figure 17 This is another fabrication process diagram of the array substrate provided in the embodiments of this application.

[0042] Explanation of icon numbers:

[0043] Display panel 100; array substrate 11; substrate 12; base layer 13; organic light-emitting unit 14; water and oxygen absorption structure 15; receiving groove 15a; first electrode layer 16; second electrode layer 18; organic light-emitting layer 17; first injection layer 21; first transport layer 22; second injection layer 23; second transport layer 24; passivation layer 25; main body 26; extension 27; first base 131; second base 132; driving TFT layer 28; TFT unit 34; gate 29; insulating layer 30; active layer 31; source 32; drain 33. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. In addition, the reference to "embodiment" or "implementation method" in this application means that a specific feature, structure or characteristic described in connection with the embodiment or implementation method can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0045] In describing some embodiments, the term "electrical connection" and its derivative expressions may be used. For example, the term "connection" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. As another example, the term "electrical connection" may be used in describing some embodiments to indicate that two or more components have physical contact or an electrical signal path, such as two components being connected by a signal line, or other electrical components or circuits existing between the two components, but a signal path exists between them through these other electrical components. However, the term "electrical connection" may also refer to two or more components that do not have direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0046] Please see Figure 1 This application provides a method to reduce the impact of moisture, oxygen, etc., on the display panel 100 and improve the stability of the display panel. The display panel 100 includes, but is not limited to, a panel with self-emissive units such as an OLED. The display panel 100 includes an array substrate 11. The array substrate 11 includes, but is not limited to, a pixel unit array substrate. The array substrate 11 has a plurality of pixel units arranged in an array.

[0047] Please see Figure 2The array substrate 11 includes a substrate 12, a base layer 13, a plurality of organic light-emitting units 14, and at least one water and oxygen absorption structure 15.

[0048] Please see Figure 2 A base layer 13 is disposed on the substrate 12. The base layer 13 includes, but is not limited to, a pixel definition layer 15. The base layer 13 includes an opening region 13a. This opening region 13a is also the light-emitting region of the pixel unit. The organic light-emitting unit 14 is disposed in the opening region 13a.

[0049] Please see Figure 2 and Figure 3 The organic light-emitting unit 14 includes at least a first electrode layer 16, a second electrode layer 18, and an organic light-emitting layer 17 disposed sequentially. The first electrode layer 16 is located between the substrate 12 and the second electrode layer 18. The first electrode layer 16 and the second electrode layer 18 are used to provide a driving voltage for the organic light-emitting layer 17 to drive the organic light-emitting layer 17 to emit light.

[0050] The first electrode layer 16 or the second electrode layer 18 is made of a relatively active metal, such as Ag / Al.

[0051] The organic light-emitting layer 17 includes, but is not limited to, organic light-emitting materials. In other words, the organic light-emitting layer 17 is the organic light-emitting layer 17 in the organic light-emitting unit 14. Over time, the organic layer will generate water vapor. This water vapor moves to the active metal (electrode) on the side of the organic light-emitting unit 14 or to other active metals (electrodes or traces), and easily reacts with the active metals (electrodes or traces), affecting the performance of the active metals (electrodes or traces).

[0052] Optional, please refer to Figure 4 The organic light-emitting unit 14 further includes a first injection layer 21, a first transport layer 22, a second injection layer 23, and a second transport layer 24. The first electrode layer 16, the first injection layer 21, the first transport layer 22, the organic light-emitting layer 17, the second transport layer 24, the second injection layer 23, and the second electrode layer 18 are sequentially arranged. When the first electrode layer 16 is the anode layer and the second electrode layer 18 is the cathode layer, the first injection layer 21 is the hole injection layer, the first transport layer 22 is the hole transport layer, the second injection layer 23 is the electron injection layer, and the second transport layer 24 is the electron transport layer. When the second electrode layer 18 is the anode layer and the first electrode layer 16 is the cathode layer, the second injection layer 23 is the hole injection layer, the second transport layer 24 is the hole transport layer, the first injection layer 21 is the electron injection layer, and the first transport layer 22 is the electron transport layer.

[0053] In the following embodiments of this application, when the first electrode layer 16 is the anode layer, the second electrode layer 18 is the cathode layer, the first injection layer 21 is the hole injection layer, the first transport layer 22 is the hole transport layer, the second injection layer 23 is the electron injection layer, and the second transport layer 24 is the electron transport layer, the first injection ...21 is the hole transport layer.

[0054] The electron transport layer (second transport layer 24) and hole transport layer (first transport layer 22) are also prone to reacting with oxygen and moisture. Moisture generated by the organic layers can also affect the electron transport layer (second transport layer 24) and hole transport layer (first transport layer 22), causing the OLED display panel to fail. Forming a barrier at the edge of the display panel 100 to prevent moisture intrusion, or forming a locking or recessed structure at the edge frame adhesive to firmly bond the adhesive to the upper and lower substrates 12, can prolong the moisture intrusion path. However, these methods cannot prevent moisture generated by the organic layers inside the display panel 100 from affecting the active metal, electron transport layer (second transport layer 24), and hole transport layer (first transport layer 22).

[0055] Please see Figure 2 and Figure 3 At least a portion of the water-oxygen absorption structure 15 is disposed in the substrate layer 13 and adjacent to the organic light-emitting unit 14. The water-oxygen absorption structure 15 is used to absorb water vapor generated by the organic light-emitting layer 17 in the organic light-emitting unit 14 and to block external water vapor from entering the organic light-emitting unit 14.

[0056] The array substrate 12 provided in this application embodiment is designed with a base layer 13 disposed on the substrate 12, the base layer 13 having multiple opening regions; the organic light-emitting unit 14 is disposed in the opening region 13a; at least a portion of the water-oxygen absorption structure 15 is disposed in the base layer 13 and is disposed adjacent to the organic light-emitting unit 14. The water-oxygen absorption structure 15 is used to absorb water vapor generated in the organic layer of the organic light-emitting unit 14 and to block external water vapor from entering the organic light-emitting unit 14, thereby preventing the electrodes of the organic light-emitting unit 14 from reacting with water vapor and oxygen; it also prevents the hole transport layer (first transport layer 22), electron transport layer (second transport layer 24) and other film layers in the organic light-emitting unit 14 from reacting with oxygen and water vapor, causing the OLED display panel 100 to fail, thereby improving the stability of the OLED display panel 100.

[0057] When moisture intrudes, the water-oxygen absorption structure 15 can effectively intercept it. On the other hand, when the organic layer of the display panel 100 itself generates moisture, the water-oxygen absorption structure 15 can also effectively adsorb the moisture, effectively solving the problem of dark spots and corrosion of the OLED display panel 100 caused by water-oxygen intrusion.

[0058] In one optional embodiment, the water-oxygen absorption structure 15 is a porous structure, and the material of the water-oxygen absorption structure 15 includes a metal-organic framework material.

[0059] Specifically, the material of the water-oxygen absorption structure 15 includes metal-organic frameworks (MOFs). MOFs are porous crystalline materials, consisting of a network structure crystal formed by the coordination of metal ions or metal clusters with organic ligands; therefore, they are also called porous coordination polymers. The water-oxygen absorption structure 15 utilizes the porous properties of the material to adsorb water vapor. When water vapor encounters the porous water-oxygen absorption structure 15, it is adsorbed onto the surface of the water-oxygen absorption structure 15, thereby achieving the adsorption effect of the water-oxygen absorption structure 15 on water vapor.

[0060] For example, the metal ions in metal-organic framework materials include, but are not limited to, nickel (Ni), copper (Cu), and zinc (Zn) ions. These metal ions can react with water and oxygen, thereby achieving the absorption of water and oxygen.

[0061] For example, the metallic materials in metal-organic framework materials include, but are not limited to, particles such as magnesium oxide and calcium oxide. These particles can chemically interact with water, have excellent water absorption, and can maintain high water permeability for a relatively long time.

[0062] For another example, polymers in metal-organic framework materials form bonds with the metal after reaction, inhibiting water propagation. Furthermore, the introduction of certain groups within the polymer molecule allows them to form hydrogen bonds with water, thus further inhibiting water propagation and providing higher water permeability resistance. For instance, polymers include, but are not limited to, aminosilane compounds, which contain alkoxysilyl and amino groups within their molecules. The alkoxysilyl group reacts with the hydroxyl groups on the surface of magnesium oxide particles to form bonds. Therefore, amino groups are introduced into the surface of magnesium oxide particles modified with aminosilane compounds.

[0063] The embodiment of this application provides a porous structure for setting the water-oxygen absorption structure 15. This porous structure can adsorb and contain water vapor inside the display panel 100. The material of the water-oxygen absorption structure 15 includes a metal-organic framework material, which forms a porous coordination polymer. After water vapor enters the metal-organic framework material, on the one hand, the water vapor reacts chemically with the metal particles and absorbs water, and on the other hand, the organic framework material forms hydrogen bonds with water and thus inhibits the advance of water.

[0064] In one alternative embodiment, please refer to Figure 5The water and oxygen absorption structure 15 can be completely disposed within the substrate layer 13. The water and oxygen absorption structure 15 is disposed on the periphery of the electron transport layer (second transport layer 24), the organic light-emitting layer 17 and the hole transport layer (first transport layer 22) in the thickness direction of the substrate layer 13, so as to avoid external water vapor from affecting the electron transport layer (second transport layer 24), the organic light-emitting layer 17 and the hole transport layer (first transport layer 22).

[0065] Optionally, the water-oxygen absorption structure 15 and the electron transport layer (second transport layer 24) are spaced apart to avoid the water vapor absorbed by the water-oxygen absorption structure 15 affecting the effectiveness of the electron transport layer (second transport layer 24).

[0066] Optionally, the water-oxygen absorption structure 15 and the hole transport layer (first transport layer 22) are spaced apart to avoid the water vapor absorbed by the water-oxygen absorption structure 15 affecting the effectiveness of the hole transport layer (first transport layer 22).

[0067] Optionally, the water and oxygen absorption structure 15 is spaced apart from the anode layer (first electrode layer 16) to prevent the water vapor absorbed by the water and oxygen absorption structure 15 from reacting with the anode layer of the active metal, thereby affecting the effectiveness of the water and oxygen absorption structure 15.

[0068] Optionally, the water and oxygen absorption structure 15 can contact the organic light-emitting layer 17 to absorb the water vapor emitted by the organic light-emitting layer 17, thereby preventing the water vapor emitted by the organic light-emitting layer 17 from affecting the effectiveness of the electron transport layer (second transport layer 24), hole transport layer (first transport layer 22), and anode layer.

[0069] In one alternative embodiment, please refer to Figure 2 and Figure 3 The array substrate 12 further includes a passivation layer 25. The passivation layer 25 is disposed between the base layer 13 and the substrate 12. The water-oxygen absorption structure 15 is columnar, and a portion of the water-oxygen absorption structure 15 extends into the passivation layer 25. Specifically, the water-oxygen absorption structure 15 extends at least a certain distance in the thickness direction of the base layer 13. For example, the water-oxygen absorption structure 15 is columnar, so that a portion of the water-oxygen absorption structure 15 is embedded in the base layer 13, and another portion of the water-oxygen absorption structure 15 is embedded in the passivation layer 25. In this way, the water-oxygen absorption structure 15 can strengthen the adhesion between the base layer 13 and the underlying passivation layer 25, making the pixel definition layer less likely to fall off.

[0070] In one alternative embodiment, please refer to Figure 6The dimension of the water-oxygen absorption structure 15 located in the passivation layer 25 is larger than the dimension of the end of the water-oxygen absorption structure 15 located in the substrate layer 13. In other words, the water-oxygen absorption structure 15 is narrow at the top and wide at the bottom. The top end of the water-oxygen absorption structure 15 refers to the end of the pixel definition layer that is away from the passivation layer 25, and the bottom end of the water-oxygen absorption structure 15 is the end embedded in the passivation layer 25.

[0071] In this embodiment, by setting the size of one end of the water-oxygen absorption structure 15 in the passivation layer 25 to be larger than the size of one end of the water-oxygen absorption structure 15 in the base layer 13, that is, the water-oxygen absorption structure 15 is a structure that is narrow at the top and wide at the bottom. In addition to absorbing water vapor, the water-oxygen absorption structure 15 can also strengthen the adhesion between the pixel definition layer and the passivation layer 25 below it through the structure that is narrow at the top and wide at the bottom, so that the pixel definition layer is not easy to fall off from the passivation layer 25.

[0072] In this embodiment, the organic light-emitting layer 17 can be in contact with the water-oxygen absorption structure 15. In this way, the water vapor generated by the organic light-emitting layer 17 is guided to the water-oxygen absorption structure 15, thereby reducing the impact of the water vapor generated by the organic light-emitting layer 17 on the anode metal layer, electron transport layer (second transport layer 24), hole transport layer (first transport layer 22), etc.

[0073] In one alternative embodiment, please refer to Figure 7 At least one end of the organic light-emitting layer 17 (in the horizontal direction) is projected orthogonally in the thickness direction of the substrate layer 13 outside the region where the first electrode layer 16 (anode metal layer) is located. At least one end of the organic light-emitting layer 17 is located near or connected to the water-oxygen absorption structure 15.

[0074] In other words, the area of ​​the organic light-emitting layer 17 in the horizontal direction is larger than the area of ​​the first electrode layer 16 in the horizontal direction, so that at least one end of the organic light-emitting layer 17 extends beyond the first electrode layer 16 in the horizontal direction. In other words, the orthogonal projection of at least one end of the organic light-emitting layer 17 in the thickness direction of the substrate layer 13 lies outside the region where the first electrode layer 16 is located. Thus, at least one end of the organic light-emitting layer 17 extending beyond the region corresponding to the first electrode layer 16 can contact or be close to the water-oxygen absorption structure 15. This guides the water vapor generated by the organic light-emitting layer 17 to the water-oxygen absorption structure 15, thereby reducing the impact of the water vapor generated by the organic light-emitting layer 17 on the anode metal layer, electron transport layer (second transport layer 24), hole transport layer (first transport layer 22), etc.

[0075] Optionally, the two ends of the organic light-emitting layer 17, projected in the thickness direction of the substrate layer 13, are located outside the region where the first electrode layer 16 is located. The two ends of the organic light-emitting layer 17 extending beyond the region corresponding to the first electrode layer 16 can contact or be close to the water-oxygen absorption structure 15. This guides the water vapor generated by the organic light-emitting layer 17 to the water-oxygen absorption structure 15, thereby reducing the impact of the water vapor generated by the organic light-emitting layer 17 on the anode metal layer, electron transport layer (second transport layer 24), hole transport layer (first transport layer 22), etc.

[0076] Optionally, the peripheral end of the organic light-emitting layer 17, projected in the thickness direction of the substrate layer 13, lies outside the region where the first electrode layer 16 is located. The peripheral end of the organic light-emitting layer 17 extending beyond the region corresponding to the first electrode layer 16 can contact or be close to the water-oxygen absorption structure 15. This guides the water vapor generated by the organic light-emitting layer 17 to the water-oxygen absorption structure 15, thereby reducing the impact of the water vapor generated by the organic light-emitting layer 17 on the anode metal layer, electron transport layer (second transport layer 24), hole transport layer (first transport layer 22), etc.

[0077] Further optional information can be found in [link to relevant documentation]. Figure 8 The water and oxygen absorption structure 15 can be divided into two parts. The water and oxygen absorption structure 15 includes a first absorption part 151 and a second absorption part 152 arranged along the thickness direction of the base layer 13. The end of the organic light-emitting layer 17 can be disposed on the first absorption part 151, and the second absorption part 152 is disposed on the organic light-emitting layer 17.

[0078] Optionally, when the water-oxygen absorption structure 15 is spaced apart from the organic light-emitting layer 17 and the first electrode layer 16, the distance between the water-oxygen absorption structure 15 and the organic light-emitting layer 17 is smaller than the distance between the water-oxygen absorption structure 15 and the first electrode layer 16. This enhances the water vapor absorption of the organic light-emitting layer 17 by the water-oxygen absorption structure 15 and reduces the influence of water vapor in the water-oxygen absorption structure 15 on the first electrode layer 16 (active metal).

[0079] In one alternative embodiment, please refer to Figure 9 The water-oxygen absorption structure 15 includes a main body 26 and an extension 27 interconnected as one unit. The main body 26 is disposed along the thickness direction of the substrate layer 13. One end of the extension 27 is connected to the main body 26. The other end of the extension 27 extends to a position close to or connected to the organic light-emitting layer 17 in the organic light-emitting unit 14. This is to guide the water vapor generated by the organic light-emitting layer 17 to the water-oxygen absorption structure 15, thereby reducing the impact of the water vapor generated by the organic light-emitting layer 17 on the anode metal layer, electron transport layer (second transport layer 24), hole transport layer (first transport layer 22), etc.

[0080] The water-oxygen absorption structure 15 provided in this embodiment is designed with an interconnected main body 26 and an extension 27. The main body 26 is arranged along the thickness direction of the base layer 13. One end of the extension 27 is connected to the main body 26, and the other end of the extension 27 extends to a position close to or connected to the organic light-emitting layer 17 in the organic light-emitting unit 14. The extension 27 can reduce the distance and water vapor path between the organic light-emitting layer 17 and the water-oxygen absorption structure 15, making it easier for water vapor to flow to and be absorbed by the water-oxygen absorption structure 15, thereby reducing the impact of water vapor on the anode metal layer, electron transport layer (second transport layer 24), hole transport layer (first transport layer 22), etc.

[0081] In one alternative embodiment, please refer to Figures 10 to 12 The water-oxygen absorption structure 15 is in the shape of a ring column.

[0082] Please see Figure 10 and Figure 11 The water and oxygen absorption structure 15 is disposed around the opening region 13a; in other words, the water and oxygen absorption structure 15 may be disposed in a ring shape around the periphery of the opening region 13a of the pixel definition layer; or, please refer to Figure 12 Multiple water-oxygen absorption structures 15, spaced apart, are arranged around the periphery of the opening area 13a. In other words, the water-oxygen absorption structure 15 can be designed as multiple solid cylinders surrounding the periphery of the opening area 13a of the pixel definition layer. The water-oxygen absorption structure 15 can be configured as a cylinder with a narrow top and a wide bottom, a square body, or other structures. In addition to adsorbing water vapor, the water-oxygen absorption structure 15 can also strengthen the adhesion between the pixel definition layer and its underlying film layer, improving the anti-detachment capability of the film layer on the OLED display panel 100.

[0083] In one optional embodiment, the substrate layer 13 is made of an inorganic material. The substrate layer 13 is a pixel definition layer. The material of the substrate layer 13 includes, but is not limited to, silicon carbide, silicon oxide, etc.

[0084] Please see Figure 13The substrate layer 13 further includes a first substrate 131 and a second substrate 132. The first substrate 131 is disposed between the main body portion 26 and the organic light-emitting unit 14. The second substrate 132 is disposed between the extension portion 27 and the organic light-emitting layer 17 of the organic light-emitting unit 14. The density of the first substrate 131 is greater than the density of the second substrate 132. Because the second base 132 has a low density, the second base 132 between the organic light-emitting layer 17 and the extension 27 can form a water vapor transport channel, which facilitates the movement of water vapor generated by the organic light-emitting layer 17 towards the extension 27 in the water-oxygen absorption structure 15 via the second base 132, thus facilitating water vapor absorption. Meanwhile, the first base 131 located between the water-oxygen absorption structure 15 and the electron transport layer (second transport layer 24), hole transport layer (first transport layer 22), and anode electrode layer has a high density, forming a denser partition that reduces water vapor transport and prevents water vapor in the water-oxygen absorption structure 15 from affecting the effectiveness of the electron transport layer (second transport layer 24), hole transport layer (first transport layer 22), and anode electrode layer.

[0085] In the OLED display panel 100, the metal electrodes and various transport layers are highly susceptible to reaction with moisture. Besides oxygen and water vapor from the external environment, moisture generated by the organic light-emitting layer 17 of the panel itself can also easily cause corrosion and failure of the OLED metal electrodes. This application forms a water-oxygen absorption structure 15 within the pixel definition layer (substrate layer 13) and passivation layer 25. The water-oxygen absorption structure 15 surrounds the opening region 13a of the pixel definition layer (substrate layer 13), preventing external moisture from corroding the OLED display panel 100 and absorbing moisture generated by the organic film layer itself. This effectively prevents external moisture and moisture generated by the organic layer from corroding the OLED display panel 100, improving the stability of the OLED display panel 100 and extending its lifespan.

[0086] In one alternative implementation, please refer to Figure 14An organic light-emitting layer 17 is disposed on the opening side of the opening region 13a. An anode layer, a hole injection layer, and a hole transport layer are stacked on one side of the bottom of the opening region 13a, and a cathode layer, an electron injection layer, and an electron transport layer are stacked on the other side of the bottom of the opening region 13a. The organic light-emitting layer 17 is disposed within the space formed by the anode layer, hole injection layer, hole transport layer, cathode layer, electron injection layer, and electron transport layer within the opening region 13a. The anode layer, hole injection layer, and hole transport layer are separated from the cathode layer, electron injection layer, and electron transport layer by the organic light-emitting layer 17 or by partition pillars. A water-oxygen absorption structure 15 is disposed within the pixel definition layer (base layer 13). The end of the water-oxygen absorption structure 15 facing away from the passivation layer 25 contacts or is close to the organic light-emitting layer 17. Alternatively, the end of the water-oxygen absorption structure 15 facing away from the passivation layer 25 extends into an extension portion 27 that contacts or is close to the organic light-emitting layer 17. Alternatively, at least one end of the organic light-emitting layer 17 extends beyond the corresponding regions of the anode and cathode layers and contacts or approaches the organic light-emitting layer 17. This guides the water vapor generated by the organic light-emitting layer 17 to the water-oxygen absorption structure 15, thereby reducing the impact of the water vapor generated by the organic light-emitting layer 17 on the anode metal layer, electron transport layer, hole transport layer, etc.

[0087] In one alternative implementation, please refer to Figure 2 The array substrate 11 further includes a driving TFT layer 28, which is disposed on the substrate 12. The base layer 13 is disposed on the driving TFT layer 28, and the driving TFT layer 28 is electrically connected to the first electrode layer 16. The first electrode layer 16 is an anode layer.

[0088] Optional, please refer to Figure 2 The driving TFT layer 28 also includes a plurality of TFT units 34. The plurality of TFT units 34 are disposed on the substrate 12. Specifically, the substrate 12 has a gate 29, an insulating layer 30 covering the gate 29, an active layer 31 disposed on the insulating layer 30, a source 32 connected to the active layer 31, and a drain 33 connected to the active layer 31, the active layer 31 corresponding to the gate 29. The passivation layer 25 covers the source 32, drain 33, and active layer 31 of the plurality of TFT units 34. A pixel definition layer (base layer 13) and an organic light-emitting unit 14 are disposed on the passivation layer 25. The drain 33 of the TFT unit 34 corresponds to the anode layer (first electrode layer 16) of the organic light-emitting unit 14. The passivation layer 25 includes conductive vias. The conductive vias electrically connect the anode layer (first electrode layer 16) of the organic light-emitting unit 14 to the drain 33 of the TFT unit 34.

[0089] The anode layers (first electrode layers 16) of two adjacent organic light-emitting units 14 are spaced apart. Each TFT unit 34 is electrically connected to the anode layer (first electrode layer 16) of one organic light-emitting unit 14. The TFT unit 34 is used to provide an anode voltage to the anode layer (first electrode layer 16) of each organic light-emitting unit 14.

[0090] In a first optional embodiment, the array substrate 11 further includes a plurality of cathode driving units (not shown). The cathode layers (second electrode layers 18) of at least two of the organic light-emitting units 14 are spaced apart, i.e., not directly connected. For independently configured cathode layers (second electrode layers 18), each cathode driving unit is electrically connected to the cathode layer (second electrode layer 18) of one organic light-emitting unit 14. This is a cathode-driven design. In this configuration, the cathode layer (second electrode layer 18) and anode layer (first electrode layer 16) of each organic light-emitting unit 14 are driven by independent driving devices.

[0091] In the embodiment of the cathode-driven design, each organic light-emitting unit 14 has its own driving device for its cathode layer (second electrode layer 18) and anode layer (first electrode layer 16), which can be supplied with current separately for each organic light-emitting unit 14.

[0092] In the second alternative embodiment, please refer to Figure 2 Taking the second electrode layer 18 as the cathode layer as an example, the second electrode layers 18 of the plurality of organic light-emitting units 14 are electrically connected to each other. Optionally, a portion of the second electrode layer 18 extends out of the opening region 13a and is disposed on the side of the base layer 13 facing away from the substrate 12. One end of the water-oxygen absorption structure 15 abuts against the portion of the second electrode layer 18 extending out of the opening region 13a. The cathode layers (second electrode layers 18) in each pixel unit are connected to achieve a common cathode effect.

[0093] In an embodiment of the common cathode driving design, the anode layer (first electrode layer 16) is a separate driving device. The cathode layer (second electrode layer 18) is driven together. In the common cathode method, the anode is inside the pixel opening, while part of the cathode is inside the pixel opening and part is above the pixel definition layer (substrate layer 13), avoiding the opening region 13a. Furthermore, the cathode layer is coated over its entire surface, enabling common cathode layer driving.

[0094] Please see Figure 15 Combined with reference Figure 16 and Figure 17 This embodiment also provides a method S100 for fabricating an array substrate 11. The method S100 includes, but is not limited to, the following steps.

[0095] Step S110: Refer to Figure 17 In step a, a base layer 13 is formed on substrate 12.

[0096] Optionally, a base layer 13 is first coated on the substrate 12, the base layer 13 being a pixel definition layer (base layer 13).

[0097] Prior to this, a TFT driving layer is formed on substrate 12, and a passivation layer 25 is coated and formed on the TFT driving layer. A pixel definition layer (base layer 13) is formed on the passivation layer 25.

[0098] Step S120: Reference Figure 16 a, b and reference Figure 17 In section b, at least one receiving groove 15a and a plurality of opening regions 13a are formed on the base layer 13, wherein the receiving groove 15a is disposed adjacent to the opening regions 13a.

[0099] Optionally, the pixel definition layer (base layer 13) is exposed and developed to form at least one accommodating groove 15a and a plurality of opening regions 13a.

[0100] Step S130: Reference Figure 16 c and Figure 17 In sections c and d, a first electrode layer 16 is formed in the opening region 13a, and a water and oxygen absorption structure 15 is formed in the receiving groove 15a.

[0101] The first electrode layer 16 includes, but is not limited to, metals such as silver and aluminum.

[0102] Step S140: Reference Figure 16 d and Figure 17 In the opening region 13a, an organic light-emitting layer 17 and a second electrode layer 18 are formed to form an organic light-emitting unit 14. The water and oxygen absorption structure 15 is used to absorb water vapor generated by the organic light-emitting layer 17 in the organic light-emitting unit 14 and to block external water vapor from entering the organic light-emitting unit 14.

[0103] Optionally, the organic light-emitting layer 17 may cover the water and oxygen absorption structure 15 or be spaced apart from the water and oxygen absorption structure 15.

[0104] Specifically, an organic light-emitting layer 17 is coated on the first electrode layer 16, and a second electrode layer 18 is coated on the organic light-emitting layer 17. The material of the second electrode layer 18 is a light-transmitting and conductive material. The second electrode layer 18 is the light-emitting side.

[0105] The array substrate 12 provided in this application embodiment is designed to form a base layer 13 on the substrate 12; at least one receiving groove 15a and a plurality of opening regions 13a are formed on the base layer 13, with the receiving groove 15a disposed adjacent to the opening region 13a; a first electrode layer 16 is formed in the opening region 13a, and a water-oxygen absorption structure 15 is formed in the receiving groove 15a; an organic light-emitting layer 17 and a second electrode layer 18 are formed in the opening region 13a to form an organic light-emitting unit 14 in the opening region 13a. The water-oxygen absorption structure 15 is used to absorb water vapor generated by the organic layer in the organic light-emitting unit 14 and to block external water vapor from entering the organic light-emitting unit 14, thereby preventing the electrodes of the organic light-emitting unit 14 from reacting with water vapor and oxygen; it also prevents the hole transport layer (first transport layer 22), electron transport layer (second transport layer 24) and other film layers in the organic light-emitting unit 14 from reacting with oxygen and water vapor, causing the OLED display panel 100 to fail, thereby improving the stability of the OLED display panel 100.

[0106] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, and such improvements and refinements are also considered to be within the protection scope of this application.

Claims

1. An array substrate, characterized in that, include: substrate; A base layer is disposed on the substrate, and the base layer has multiple opening regions; An organic light-emitting unit is disposed in any of the opening regions, wherein the opening region is the light-emitting region of the pixel unit; and At least one water and oxygen absorption structure is provided, which extends along the thickness direction of the array substrate and is at least partially disposed in the substrate layer, and is disposed adjacent to and surrounding one of the organic light-emitting units. The water and oxygen absorption structure is used to absorb water vapor generated by the organic light-emitting layer in the organic light-emitting unit and to block external water vapor from entering the organic light-emitting unit. Wherein, at least one end of the organic light-emitting layer extends along a horizontal direction and connects to the water-oxygen absorption structure, or a portion of the water-oxygen absorption structure extends along the horizontal direction and connects to the organic light-emitting layer in the organic light-emitting unit, wherein the horizontal direction is perpendicular to the thickness direction of the array substrate.

2. The array substrate as described in claim 1, characterized in that, The water-oxygen absorption structure is a porous structure, and the material of the water-oxygen absorption structure includes metal-organic framework materials.

3. The array substrate as described in claim 1, characterized in that, The array substrate further includes a passivation layer disposed between the base layer and the substrate, and the water-oxygen absorption structure is columnar, with a portion of the water-oxygen absorption structure extending into the passivation layer.

4. The array substrate as described in claim 3, characterized in that, The dimension of the water-oxygen absorption structure at one end in the passivation layer is larger than the dimension of the end of the water-oxygen absorption structure in the substrate layer.

5. The array substrate as described in claim 1, characterized in that, The organic light-emitting unit includes a first electrode layer, an organic light-emitting layer, and a second electrode layer arranged sequentially. The first electrode layer is located between the substrate and the second electrode layer. A portion of the second electrode layer extends out of the opening area and is disposed on the side of the substrate layer away from the substrate. One end of the water-oxygen absorption structure abuts against the portion of the second electrode layer extending out of the opening area. The water-oxygen absorption structure is spaced apart from the first electrode layer.

6. The array substrate as described in claim 5, characterized in that, At least one end of the organic light-emitting layer has its orthogonal projection in the thickness direction of the substrate layer located outside the region where the first electrode layer is located, and at least one end of the organic light-emitting layer is located near the water-oxygen absorption structure or connected to the water-oxygen absorption structure.

7. The array substrate as claimed in claim 1, characterized in that, The water and oxygen absorption structure includes a main body and an extension that are interconnected. The main body is disposed along the thickness direction of the substrate layer. One end of the extension is connected to the main body, and the other end of the extension extends to a position close to or connected to the organic light-emitting layer in the organic light-emitting unit.

8. The array substrate as described in any one of claims 1-7, characterized in that, The water-oxygen absorption structure is in the shape of a ring column and is arranged to surround the opening area; or, multiple water-oxygen absorption structures arranged at intervals are arranged around the periphery of the opening area.

9. A method for fabricating an array substrate according to any one of claims 1-8, characterized in that, include: A substrate layer is formed on the substrate; At least one receiving groove and a plurality of opening areas are formed on the base layer, wherein the receiving groove is disposed adjacent to the opening areas; A first electrode layer is formed in the opening area, and a water-oxygen absorption structure is formed in the receiving tank. An organic light-emitting layer and a second electrode layer are formed in the opening area to form an organic light-emitting unit. The water-oxygen absorption structure is used to absorb water vapor generated by the organic light-emitting layer in the organic light-emitting unit and to block external water vapor from entering the organic light-emitting unit.

10. A display panel, characterized in that, Includes the array substrate as described in any one of claims 1 to 8.

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