Display panel, display screen and electronic device

Abstract

This application provides a display panel, a display screen, and an electronic device, relating to the field of electronic device technology. The display panel includes a pixel definition layer and a light-emitting layer. An opening is formed in the pixel definition layer, and a support is disposed on the surface of the pixel definition layer. A charge-generating layer and a cathode layer are stacked on the surface of the support, the surface of the pixel definition layer, and within the opening. The light-emitting layer is disposed within the opening. The display panel has an isolation groove surrounding the outside of the support. The display panel has an isolation region located inside the isolation groove and a functional region located outside the isolation groove. The support is located in the isolation region, and the light-emitting layer is located in the functional region. The isolation groove penetrates at least one of the cathode layer and the charge-generating layer along the thickness direction of the display panel, causing at least one of the cathode layer and the charge-generating layer to be partially disconnected on both sides of the isolation groove. Thus, the Tandem OLED display panel is less prone to problems such as low brightness and bright spots due to damage to the structural layers on the surface of the support.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel, a display screen, and an electronic device. Background Technology

[0002] Organic light-emitting diode (OLED) display panels are self-emissive display panels that emit light through organic light-emitting layers. They possess excellent characteristics such as high contrast, fast response speed, small differences in high and low brightness color gamut, and thin and light display, and are widely used in various electronic devices (such as mobile phones). Tandem organic light-emitting diode (TANDEM) display panels are OLED display panels formed by stacking multiple light-emitting layers in series through charge generation layers (CGLs). Compared with single-layer light-emitting OLED display panels, they have advantages such as high brightness, long lifespan, and low power consumption.

[0003] In related technologies, Tandem OLED display panels are prone to localized low-brightness bright spots. Summary of the Invention

[0004] This application provides a display panel, a display screen, and an electronic device to solve the problem of localized low-brightness bright spots in TandemOLED display panels in the prior art.

[0005] A first aspect of this application provides a display panel, which includes a pixel definition layer, a support, a hole functional layer, a charge generation layer, a light-emitting layer, an electronic functional layer, and a cathode layer. The pixel definition layer has an opening, and the support is disposed on a surface of one side of the pixel definition layer. The hole functional layer, the charge generation layer, the electronic functional layer, and the cathode layer are stacked on the surface of the support, the surface of the pixel definition layer, and within the opening. The light-emitting layer is disposed within the opening and located between the hole functional layer and the electronic functional layer.

[0006] The display panel has an isolation groove surrounding the outside of the support body. The display panel has an isolation area located inside the isolation groove and a functional area located outside the isolation groove. The support body is located in the isolation area, and the light-emitting layer is located in the functional area. The isolation groove penetrates at least one of the cathode layer and the charge-generating layer along the thickness direction of the display panel, so that at least one of the cathode layer and the charge-generating layer is partially disconnected on both sides of the isolation groove.

[0007] The display panel provided in this application embodiment forms an isolation area inside the isolation groove and a functional area outside the isolation groove by setting an isolation groove. The portion of the support and structural layer on the surface of the support is located in the isolation area. The portion of the structural layer on the surface of the support is easily damaged by compression, that is, the easily damaged part of the structural layer is located in the isolation area. The portion of the light-emitting layer and the portion of the structural layer connected to the light-emitting layer are located in the functional area. At least one of the cathode layer and the charge-generating layer is disconnected on both sides of the isolation groove, so that even if the portion of the cathode layer in the isolation area and the portion of the charge-generating layer in the isolation area make electrical contact, the portion of the cathode layer in the functional area and connected to the light-emitting layer and the portion of the charge-generating layer in the functional area and connected to the light-emitting layer will not short-circuit. In other words, the portion of the cathode layer connected to the light-emitting layer and the portion of the charge-generating layer connected to the light-emitting layer are not easily short-circuited due to damage to the structural layer on the surface of the support. This makes the Tandem OLED display panel less prone to problems such as low brightness and bright spots due to damage to the structural layer on the surface of the support, which helps to improve the reliability of the display panel. In addition, the light-emitting layer and the parts connected to the structural layer and the light-emitting layer are located in the functional area, while the isolation groove is located outside the functional area. The isolation groove is not likely to affect the connection of the light-emitting layer, which is conducive to maintaining the cooperation performance of the light-emitting layer and the structural layers connected to the light-emitting layer, and to maintaining the stability and reliability of the light emission of the multi-layer light-emitting structure.

[0008] The cathode layer is connected to the light-emitting layer through the electronic functional layer. The cathode layer is used to drive the light-emitting layer to emit light. Specifically, the cathode layer can generate electrons under an applied driving voltage. After the electrons generated by the cathode layer move to the light-emitting layer, they can recombine with the holes that have moved to the light-emitting layer, thus causing the light-emitting layer to emit light.

[0009] For example, the display panel further includes an anode layer disposed at the opening. The anode layer is located on the side of the hole functional layer away from the charge generation layer and is connected to the light-emitting layer through the hole functional layer. The anode layer is used to drive the light-emitting layer to emit light. Specifically, the anode layer can generate holes under an applied driving voltage. After the holes generated by the anode layer move to the light-emitting layer, they can recombine with electrons that have moved to the light-emitting layer, thereby causing the light-emitting layer to emit light. In this way, it is convenient to drive the light-emitting layer to emit light, so as to realize the display function of the display panel.

[0010] The display panel includes at least two light-emitting layers, a charge-generating layer is provided between two adjacent light-emitting layers, a hole-functional layer is provided between the light-emitting layer and the anode layer on the side closer to the anode layer, and an electron-functional layer is provided between the light-emitting layer and the cathode layer on the side closer to the cathode layer.

[0011] For example, the display panel also includes a cover plate, which is disposed on the side of the cathode layer away from the electronic functional layer. The cover plate is used to enclose and form an encapsulation space, within which the pixel definition layer, support, hole functional layer, charge generation layer, light-emitting layer, electronic functional layer, anode layer, and cathode layer are all located. This facilitates the encapsulation of the display panel, and the cover plate protects the structural layers within the encapsulation space. Furthermore, while facilitating the encapsulation of the display panel and providing protection, the isolation grooves prevent problems such as low brightness or bright spots from occurring due to the cover plate compressing the structural layers on the support surface.

[0012] In one possible implementation, an isolation trench divides the cathode layer into a first cathode portion located in an isolation region and a second cathode portion located in a functional region, with the first cathode portion disconnected from the second cathode portion. That is, the isolation trench penetrates the cathode layer and disconnects the cathode layer on both sides of the isolation trench into the first cathode portion and the second cathode portion. The projection of the support body along the thickness direction of the display panel lies within the projection of the first cathode portion along the thickness direction of the display panel, and the projection of the light-emitting layer along the thickness direction of the display panel lies within the projection of the second cathode portion along the thickness direction of the display panel. The second cathode portion is connected to the light-emitting layer and is used to drive the light-emitting layer to emit light.

[0013] Thus, the first cathode is located in the isolation region, where it is susceptible to electrical contact with the charge generation layer due to damage to the structural layer on the support surface. The second cathode is located in the functional region, connected to the light-emitting layer and used to drive the light-emitting layer to emit light. The first and second cathodes are separated into two disconnected parts by the isolation groove, ensuring that even if the first cathode comes into electrical contact with the charge generation layer, the second cathode will not short-circuit with the charge generation layer. This makes the TandemOLED display panel less prone to low-brightness or bright spots due to damage to the structural layer on the support surface, thus improving the reliability of the display panel. Furthermore, the projection of the light-emitting layer along the thickness direction of the display panel lies within the projection of the second cathode along the thickness direction of the display panel. This prevents the isolation groove from affecting the connection between the cathode layer and the light-emitting layer, maintaining the fit between the cathode layer and the light-emitting layer, and ensuring the stability and reliability of the multi-layer light-emitting structure.

[0014] The second cathode section is connected to the light-emitting layer through an electronic functional layer.

[0015] In one possible implementation, an isolation trench divides the charge generation layer into a first charge generation section located in an isolation region and a second charge generation section located in a functional region, with the first and second charge generation sections disconnected. That is, the isolation trench penetrates the charge generation layer and disconnects the charge generation layer on both sides of the isolation trench into the first and second charge generation sections. The projection of the support along the thickness direction of the display panel lies within the projection of the first charge generation section along the thickness direction of the display panel, and the projection of the light-emitting layer along the thickness direction of the display panel lies within the projection of the second charge generation section along the thickness direction of the display panel. The second charge generation section is connected to the light-emitting layer and is used to drive the light-emitting layer to emit light.

[0016] Thus, the first charge generating section is located in the isolation region. This section is prone to electrical contact with the cathode layer due to damage to the structural layer on the support surface. The second charge generating section is located in the functional region, connected to the light-emitting layer and used to drive it to emit light. The first and second charge generating sections are separated into two disconnected parts by the isolation trench. This ensures that even if the first charge generating section makes electrical contact with the cathode layer, the second charge generating section will not short-circuit with the cathode layer. This makes the Tandem OLED display panel less prone to low-brightness or bright spots due to damage to the structural layer on the support surface, thus improving the reliability of the display panel. Furthermore, the projection of the light-emitting layer along the thickness direction of the display panel lies within the projection of the second charge generating section along the thickness direction of the display panel. This prevents the isolation trench from affecting the connection between the charge generating layer and the light-emitting layer, maintaining their compatibility and ensuring the stability and reliability of the multi-layer light-emitting structure.

[0017] For example, the isolation trench may penetrate only the cathode layer, or only the charge generation layer, or both the cathode layer and the charge generation layer.

[0018] When the isolation trench penetrates the cathode layer and the charge generation layer, an insulating material can be used to fill the part of the isolation trench located on the side of the electronic functional layer away from the cathode layer, so that the electronic functional layer can be a continuous structure and the isolation trench does not penetrate the electronic functional layer. In this case, the isolation trench includes a first cavity and a second cavity located on both sides of the electronic functional layer, the first cavity penetrates the cathode layer, and the second cavity penetrates the charge generation layer.

[0019] When the isolation trench penetrates the cathode layer and the charge generation layer, the isolation trench can also penetrate the cathode layer, the charge generation layer and the electronic functional layer.

[0020] When the isolation trench penetrates the charge generation layer, portions of the cathode layer and electronic functional layer at the isolation trench can sink into the isolation trench, forming a recessed structure at the isolation trench.

[0021] When the isolation trench penetrates the charge generation layer, insulating material can be used to fill the isolation trench, so that the electronic functional layer and the cathode layer can be a continuous structure, and the isolation trench does not penetrate the electronic functional layer and the cathode layer.

[0022] In one possible implementation, the isolation trench extends through the cathode layer, electron functional layer, charge generation layer and hole functional layer along the thickness direction of the display panel, and the bottom of the isolation trench is located within the pixel definition layer.

[0023] In this way, the first cathode portion is less likely to make electrical contact with the second charge-generating portion, and vice versa, which helps to further reduce the risk of short circuits between the portion of the cathode layer connected to the light-emitting layer and the portion of the charge-generating layer connected to the light-emitting layer. Furthermore, a groove can be formed in the pixel definition layer using a common mask during the formation of the pixel definition layer. During the formation of the hole functional layer, charge-generating layer, electron functional layer, and cathode layer, the hole functional layer, charge-generating layer, electron functional layer, and cathode layer can be allowed to naturally break to form a disconnected structure. This groove and disconnected structure form an isolation trench, eliminating the need for a fine metal mask and reducing the cost of forming the isolation trench. Additionally, when multiple charge-generating layers are provided between the electron functional layer and the hole functional layer, it is easier to form an isolation trench that penetrates all charge-generating layers by using an isolation trench with its bottom located within the pixel definition layer.

[0024] In one possible implementation, the distance between the bottom of the isolation trench and the side surface of the pixel definition layer near the hole function layer is H1, and the distance between the side surface of the pixel definition layer near the hole function layer and the side surface of the cathode layer away from the pixel definition layer is H2, where H1 > H2.

[0025] In this way, the first charge generating part and the second charge generating part are not easily connected by the material used to form the cathode layer contained in the isolation tank or the material used to form the charge generating layer contained in the isolation tank, and the first cathode part and the second cathode part are not easily connected by the material used to form the cathode layer contained in the isolation tank, which is conducive to achieving isolation between the first cathode part and the second cathode part, as well as isolation between the first charge generating part and the second charge generating part.

[0026] In one possible implementation, multiple charge generation layers are provided between the electron functional layer and the hole functional layer, with an isolation trench running through all the charge generation layers.

[0027] Thus, when multiple charge generation layers are provided between the electron functional layer and the hole functional layer, the portion of the cathode layer connected to the light-emitting layer and the portion of each charge generation layer connected to the light-emitting layer are less prone to short circuits, resulting in better reliability of the display panel.

[0028] In one possible implementation, the isolation groove is located between the opening and the support.

[0029] In this way, the portions of the cathode layer, the electron functional layer, the charge generation layer, and the hole functional layer located in the functional area can connect with the light-emitting layer within the opening. The opening of the isolation groove has little impact on the light emission of the light-emitting layer located within the opening, which helps to maintain the display performance of the display panel.

[0030] In one possible implementation, the projection of the isolation groove along the thickness direction of the display panel is located within the projection along the thickness direction of the display panel on one side surface of the pixel definition layer support.

[0031] Thus, the isolation trench is less likely to affect the connection between the cathode layer, electron functional layer, light-emitting layer, charge-generating layer, and hole functional layer within the opening. Furthermore, the isolation trench has minimal impact on the light emission of the light-emitting layer located within the opening, which helps maintain the display performance of the display panel. Additionally, it is convenient to form the isolation trench by creating a groove on the pixel definition layer and allowing the hole functional layer, charge-generating layer, electron functional layer, and cathode layer to naturally break during formation, creating a disconnected structure.

[0032] In one possible implementation, the isolation groove is an annular groove with a closed-loop structure.

[0033] This allows for the creation of an isolation area in the middle of the display panel by using isolation grooves, and the location of the isolation area is relatively flexible.

[0034] In one possible implementation, the surface of the pixel definition layer is provided with a plurality of supports spaced apart. The display panel has a plurality of isolation slots corresponding one-to-one with the supports, each isolation slot being disposed around the outside of the corresponding support. The display panel also has a plurality of isolation regions corresponding one-to-one with the supports, with each support's corresponding isolation region located inside the corresponding isolation slot, and each support located within its corresponding isolation region.

[0035] This facilitates the isolation of the structural layer portion located on the surface of each support, resulting in better reliability of the display panel. Furthermore, it allows for a smaller footprint for each isolation area and each isolation groove, minimizing the impact of the isolation groove on the structural layer connected to the light-emitting layer. Additionally, it facilitates the placement of light-emitting units between adjacent supports, allowing for more flexible arrangement of the light-emitting units and supports.

[0036] A second aspect of this application provides a display screen, which includes a cover plate and a display panel as described in any of the above embodiments, wherein the cover plate is disposed on the light-emitting side of the display panel.

[0037] A third aspect of this application provides an electronic device, which includes a housing and a display screen as described in any of the above embodiments, the display screen being connected to the housing. Attached Figure Description

[0038] Figure 1 A schematic diagram of an electronic device provided in an embodiment of this application;

[0039] Figure 2 A cross-sectional schematic diagram of a display screen provided in an embodiment of this application;

[0040] Figure 3 A cross-sectional schematic diagram of a multi-layer light-emitting structure of a display panel provided in an embodiment of this application;

[0041] Figure 4 This is a plan view of a display panel provided in an embodiment of this application;

[0042] Figure 5 A cross-sectional schematic diagram of a display panel provided in an embodiment of this application;

[0043] Figure 6 for Figure 5 Enlarged view of part A in the image;

[0044] Figure 7 for Figure 5 Enlarged view of part B in the image;

[0045] Figure 8 A cross-sectional schematic diagram of a structural layer disposed on the surface of a pixel definition layer and a support body of a display panel, provided in an embodiment of this application;

[0046] Figure 9 A schematic diagram of the circuit connection when the multi-layer light-emitting layers of the display panel are driven normally;

[0047] Figure 10 This is a schematic diagram of the circuit connection when the charge generation layer and the cathode layer of the display panel are short-circuited.

[0048] Figure 11 A cross-sectional schematic diagram of the support body of another display panel provided in an embodiment of this application;

[0049] Figure 12 A cross-sectional schematic diagram of the support body of another display panel provided in an embodiment of this application;

[0050] Figure 13 This is a cross-sectional schematic diagram of the support of another display panel provided in an embodiment of this application.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1. Housing; 2. Display screen;

[0053] 10. Display panel; 20. Cover plate; 30. Polarizing film; 40. Optical transparent adhesive;

[0054] 100. Multi-layered light-emitting structure;

[0055] 110, Light-emitting layer; 110a, First light-emitting layer; 110b, Second light-emitting layer; 111, Light-emitting unit; 111a, First light-emitting unit; 111b, Second light-emitting unit;

[0056] 120. Charge generation layer; 121. First charge generation section; 122. Second charge generation section;

[0057] 210, Substrate; 220, Circuit layer; 230, Pixel definition layer; 240, Anode layer; 241, Anode unit; 250, Hole functional layer; 251, Hole injection layer; 252, Hole transport layer; 260, Electron functional layer; 261, Electron transport layer; 262, Electron injection layer; 270, Cathode layer; 271, First cathode portion; 272, Second cathode portion; 280, Support;

[0058] 310. Isolation groove; 320. Opening;

[0059] 400. Cover plate;

[0060] 500. Sealed structure;

[0061] 600, pixel; 610, first subpixel; 620, second subpixel; 630, third subpixel;

[0062] S1, isolation area; S2, functional area. Detailed Implementation

[0063] This application provides an electronic device, which may include, but is not limited to, mobile phones, tablets, laptops, ultra-mobile personal computers (UMPCs), handheld computers, walkie-talkies, netbooks, point-of-sale (POS) machines, personal digital assistants (PDAs), wearable devices, in-vehicle devices, televisions, monitors, cameras, camcorders, and other devices with display functions. The following description uses a mobile phone as an example.

[0064] Figure 1 This is a schematic diagram of an electronic device provided in an embodiment of this application.

[0065] See Figure 1As shown, the electronic device includes a housing 1 and a display screen 2. The display screen 2 is connected to the housing 1, and the housing 1 can be used to support the display screen 2. The display screen 2 and the housing 1 can form an installation space for installing various components such as batteries and motherboards of the electronic device. The housing 1 can also protect and support the components within the installation space.

[0066] The housing 1 may include a middle frame and a back cover. The back cover and the display screen 2 are located on opposite sides of the middle frame and are connected to the middle frame respectively. The display screen 2, the back cover and the middle frame can be arranged to form an installation space.

[0067] Figure 2 This is a cross-sectional schematic diagram of a display screen provided in an embodiment of this application.

[0068] like Figure 2 As shown, the display screen 2 may include a display panel 10, which is an organic light-emitting diode (OLED) display panel. Correspondingly, the display screen 2 is an organic light-emitting diode display screen. The display panel 10 is used to display images.

[0069] For example, the display screen 2 also includes a cover plate 20. The cover plate 20 is disposed on the light-emitting side of the display panel 10 and is used to protect the display panel 10. The cover plate 20 is made of a transparent or translucent material. For example, the cover plate 20 can be made of transparent or translucent glass, or it can be made of transparent or translucent plastic.

[0070] For example, the display screen 2 may also include a polarizer 30, which may be disposed between the display panel 10 and the cover plate 20. The polarizer 30 is used to filter light to improve the display effect.

[0071] For example, the polarizer 30 can be bonded to the cover plate 20 by optically clear adhesive 40 (OCA).

[0072] For example, the polarizer 30 can be bonded to the display panel 10 by its own adhesive.

[0073] Figure 3 This is a cross-sectional schematic diagram of a multi-layer light-emitting structure of a display panel provided in an embodiment of this application.

[0074] like Figure 3As shown in the embodiment of this application, the display panel 10 includes a multi-layer light-emitting structure 100, which includes multiple light-emitting layers 110 connected in series. The light-emitting layers 110 are used to emit light, and the multiple light-emitting layers 110 are connected in series through a charge generation layer (CGL). That is, the display panel 10 is a tandem organic light-emitting diode (Tandem OLED) display panel.

[0075] Specifically, the multilayer light-emitting structure 100 includes at least two light-emitting layers 110 and a charge-generating layer 120 disposed between two adjacent light-emitting layers 110, with the two adjacent light-emitting layers 110 connected in series through the charge-generating layer 120. One of the at least two light-emitting layers 110 is a first light-emitting layer 110a, and the other light-emitting layer 110 is a second light-emitting layer 110b. Taking the multilayer light-emitting structure 100 including two light-emitting layers 110 as an example, in addition to the first light-emitting layer 110a and the second light-emitting layer 110b, the multilayer light-emitting structure 100 also includes a charge-generating layer 120 disposed between the first light-emitting layer 110a and the second light-emitting layer 110b. The first light-emitting layer 110a, the charge-generating layer 120, and the second light-emitting layer 110b are stacked, and the first light-emitting layer 110a and the second light-emitting layer 110b are connected in series through the charge-generating layer 120. This application embodiment uses the multilayer light-emitting structure 100 including two light-emitting layers 110 as an example for explanation.

[0076] The light-emitting layer 110 contains organic light-emitting materials, which generate photons when electrons and holes recombine in the light-emitting layer 110, thereby causing the light-emitting layer 110 to emit light.

[0077] The main function of the charge generation layer 120 is to promote additional charge injection, which helps to ensure that electrons and holes can be effectively transferred from one light-emitting layer 110 to the next light-emitting layer 110, thereby maintaining the current balance of the multilayer light-emitting structure 100 and improving the overall performance of the multilayer light-emitting structure 100 so that the multilayer light-emitting layers 110 can work together.

[0078] The display panel 10 also includes a cathode layer 270, an electronic functional layer 260, a hole functional layer 250, and an anode layer 240. The anode layer 240, the hole functional layer 250, the multilayer light-emitting structure 100, the electronic functional layer 260, and the cathode layer 270 are stacked. The cathode layer 270 and the anode layer 240 are respectively disposed on both sides of the multilayer light-emitting structure 100 in the thickness direction of the display panel 10. The electronic functional layer 260 is disposed between the cathode layer 270 and the multilayer light-emitting structure 100, and the hole functional layer 250 is disposed between the anode layer 240 and the multilayer light-emitting structure 100. The cathode layer 270, the electronic functional layer 260, the multilayer light-emitting structure 100, the hole functional layer 250, and the anode layer 240 are connected in series.

[0079] All light-emitting layers 110 of the multilayer light-emitting structure 100 are located between the electron functional layer 260 and the hole functional layer 250. That is, at least two light-emitting layers 110 are provided between the electron functional layer 260 and the hole functional layer 250, and a charge-generating layer 120 is provided between two adjacent light-emitting layers 110. The electron functional layer 260 is located between the cathode layer 270 and the light-emitting layer 110 in the multilayer light-emitting structure 100 closest to the cathode layer 270. The hole functional layer 250 is located between the anode layer 240 and the light-emitting layer 110 in the multilayer light-emitting structure 100 closest to the anode layer 240. The cathode layer 270 is connected to the light-emitting layer 110 and the charge-generating layer 120 through the electron functional layer 260, and the anode layer 240 is connected to the light-emitting layer 110 and the charge-generating layer 120 through the hole functional layer 250. The cathode layer 270 and the anode layer 240 are used to drive the light-emitting layer 110 to emit light under an applied driving voltage.

[0080] The cathode layer 270 is used to generate electrons under an applied driving voltage. The electrons from the cathode layer 270 will move towards the light-emitting layer 110 under the drive of the applied driving voltage. After the electrons generated by the cathode layer 270 move to the light-emitting layer 110, they can recombine with the holes that have moved to the light-emitting layer 110, thereby causing the light-emitting layer 110 to emit light and realize the display function of the display panel 10.

[0081] The electronic functional layer 260 includes an electron injection layer 262 (EIL) and an electron transport layer 261 (ETL). The electron injection layer 262 is disposed between the cathode layer 270 and the electron transport layer 261, and the electron transport layer 261 is disposed between the electron injection layer 262 and the multilayer light-emitting structure 100. That is, the electron transport layer 261 is disposed between the electron injection layer 262 and the light-emitting layer 110 of the multilayer light-emitting structure 100 near the cathode layer 270. The cathode layer 270 is connected to the multilayer light-emitting structure 100 through the electron injection layer 262 and the electron transport layer 261.

[0082] The electron injection layer 262 is used to reduce the electron injection barrier from the cathode layer 270 to the electron transport layer 261, so that electrons can enter the electron transport layer 261 efficiently and reach the light-emitting layer 110 efficiently.

[0083] The electron transport layer 261 is used to efficiently and uniformly transport electrons from the electron injection layer 262 to the light-emitting layer 110.

[0084] The anode layer 240 is used to generate holes under an applied driving voltage. The holes from the anode layer 240 will move towards the light-emitting layer 110 under the drive of the applied driving voltage. After the holes generated by the anode layer 240 move to the light-emitting layer 110, they can recombine with the electrons that have moved to the light-emitting layer 110, thereby causing the light-emitting layer 110 to emit light.

[0085] The hole functional layer 250 includes a hole injection layer 251 (HIL) and a hole transport layer 252 (HTL). The hole injection layer 251 is disposed between the anode layer 240 and the hole transport layer 252, and the hole transport layer 252 is disposed between the hole injection layer 251 and the multilayer light-emitting structure 100. That is, the hole transport layer 252 is disposed between the hole injection layer 251 and the light-emitting layer 110 of the multilayer light-emitting structure 100 near the anode layer 240. The anode layer 240 is connected to the multilayer light-emitting structure 100 through the hole injection layer 251 and the hole penetration layer.

[0086] Hole injection layer 251 is used to reduce the hole injection barrier from anode layer 240 to hole transport layer 252, promote efficient hole injection into hole transport layer 252, and enable holes to reach light-emitting layer 110 efficiently.

[0087] Hole transport layer 252 is used to efficiently and uniformly transport holes from hole injection layer 251 to light emission layer 110.

[0088] Under the combined action of electron transport layer 261 and hole transport layer 252, electrons and holes can reach the light-emitting layer 110 in an appropriate ratio to balance the charge carriers.

[0089] For example, the electron functional layer 260 is disposed between the cathode layer 270 and the first light-emitting layer 110a, and the hole functional layer 250 is disposed between the anode layer 240 and the second light-emitting layer 110b. The anode layer 240, the hole functional layer 250, the second light-emitting layer 110b, the charge generation layer 120, the first light-emitting layer 110a, the electron functional layer 260, and the cathode layer 270 are stacked and connected in series. Specifically, the electron transport layer 261 is disposed between the electron injection layer 262 and the first light-emitting layer 110a, and the hole transport layer 252 is disposed between the hole injection layer 251 and the second light-emitting layer 110b. The anode layer 240, the hole injection layer 251, the hole transport layer 252, the second light-emitting layer 110b, the charge generation layer 120, the first light-emitting layer 110a, the electron transport layer 261, the electron injection layer 262, and the cathode layer 270 are stacked and connected in series.

[0090] Figure 4 This is a plan view of a display panel provided in an embodiment of this application.

[0091] like Figure 4 As shown, the display panel 10 includes a plurality of pixels 600 arranged in an array. Depending on the color scheme of the display panel 10, each pixel 600 includes a corresponding number of sub-pixels. For example, the display panel 10 may adopt a red-green-blue (RGB) color scheme, and each pixel 600 includes a first sub-pixel 610, a second sub-pixel 620, and a third sub-pixel 630. The first sub-pixel 610 is a red sub-pixel used to emit red light. The second sub-pixel 620 is a green sub-pixel used to emit green light. The third sub-pixel 630 is a blue sub-pixel used to emit blue light.

[0092] Of course, the display panel 10 can also adopt other color schemes. For example, the display panel 10 can also adopt red-green-blue-white (RGBW) arrangement, PenTile arrangement, Delta arrangement, diamond arrangement, and other color schemes. The following explanation will take the display panel 10 using RGB arrangement as an example.

[0093] The display panel 10 also includes a pixel defining layer 230 (PDL), which is used to physically separate the individual sub-pixels of the display panel 10, ensuring that each sub-pixel of the display panel 10 works independently without being affected by adjacent sub-pixels.

[0094] Figure 5 This is a cross-sectional schematic diagram of a display panel provided in an embodiment of this application.

[0095] like Figure 5As shown, the display panel 10 also includes a substrate 210 and a circuit layer 220. The substrate 210 is the foundation of the display panel 10 and is used to support various functional layers. The circuit layer 220 is disposed on one side of the substrate 210 in the thickness direction of the display panel 10. The pixel definition layer 230 and the anode layer 240 are disposed on the side of the circuit layer 220 away from the substrate 210. The circuit layer 220 is in contact with and electrically connected to the anode layer 240.

[0096] For example, the substrate 210 can be a rigid substrate, and the material of the substrate 210 can be, but is not limited to, glass, plastic, ceramic, etc.

[0097] The display panel 10 also includes a support 280 (photo spacer, PS), which is disposed on the surface of the pixel definition layer 230 away from the circuit layer 220. The support 280 is used to support the mask during the processing and manufacturing of the display panel 10.

[0098] For example, the support 280 may be, but is not limited to, a block structure, a column structure, etc.

[0099] like Figure 4 , Figure 5 As shown, the pixel definition layer 230 is surrounded by a plurality of openings 320, each opening 320 corresponding to a sub-pixel, and each sub-pixel is located within the corresponding opening 320 to achieve physical separation of each sub-pixel.

[0100] Figure 6 for Figure 5 Enlarged view of part A in the image.

[0101] like Figure 6 As shown, and see Figure 5 The light-emitting layer 110 is disposed within the opening 320, so that the light-emitting layer 110 and the pixel definition layer 230 are staggered.

[0102] Each light-emitting layer 110 includes multiple light-emitting units 111. The light-emitting units 111 emit light to form sub-pixels of the display panel 10. Any two adjacent light-emitting units 111 of each light-emitting layer 110 are separated by a pixel definition layer 230. Specifically, each light-emitting unit 111 of each light-emitting layer 110 corresponds one-to-one with an opening 320. The light-emitting units 111 are disposed within the corresponding opening 320, thus placing the light-emitting layer 110 within the opening 320. Any two adjacent light-emitting units 111 of each light-emitting layer 110 are separated by the pixel definition layer 230. Multiple layers of light-emitting units 111 located within the same opening 320 are connected in series through a charge generation layer 120. The light-emitting units 111 disposed within the opening 320 form the sub-pixel corresponding to that opening 320.

[0103] The light-emitting unit 111 contains organic light-emitting material, and when electrons and holes recombine in the light-emitting unit 111, photons are generated, so that the light-emitting unit 111 emits light.

[0104] For example, both the first light-emitting layer 110a and the second light-emitting layer 110b are disposed within the opening 320, such that the first light-emitting layer 110a and the second light-emitting layer 110b are staggered from the pixel definition layer 230. The first light-emitting layer 110a includes a plurality of first light-emitting units 111a corresponding one-to-one with the opening 320. The first light-emitting units 111a are disposed within the corresponding opening 320, such that any two adjacent first light-emitting units 111a are separated by the pixel definition layer 230. The second light-emitting layer 110b includes a plurality of second light-emitting units 111b corresponding one-to-one with the opening 320. The second light-emitting units 111b are disposed within the corresponding opening 320, such that any two adjacent second light-emitting units 111b are separated by the pixel definition layer 230. The first light-emitting units 111a and the second light-emitting units 111b disposed within the same opening 320 are used to form the sub-pixel corresponding to the opening 320.

[0105] The first light-emitting unit 111a and the second light-emitting unit 111b are arranged opposite each other within the same opening 320, so that the first light-emitting layer 110a and the second light-emitting layer 110b are arranged opposite each other.

[0106] When pixel 600 includes a first sub-pixel 610, a second sub-pixel 620, and a third sub-pixel 630, and the first sub-pixel 610 is a red sub-pixel, the second sub-pixel 620 is a green sub-pixel, and the third sub-pixel 630 is a blue sub-pixel, the light-emitting unit 111 provided in the opening 320 corresponding to the first sub-pixel 610 is used to emit red light, the light-emitting unit 111 provided in the opening 320 corresponding to the second sub-pixel 620 is used to emit green light, and the light-emitting unit 111 provided in the opening 320 corresponding to the third sub-pixel 630 is used to emit blue light.

[0107] Figure 7 for Figure 5 Enlarged view of part B in the image.

[0108] like Figures 5-7 As shown, a hole function layer 250, a charge generation layer 120, an electron function layer 260, and a cathode layer 270 are stacked on the surface of the support 280, the surface of the pixel definition layer 230, and inside the opening 320. An anode layer 240 is located at the opening 320. The anode layer 240 is located on the side of the hole function layer 250 away from the charge generation layer 120 and is connected to the light-emitting layer 110 through the hole function layer 250.

[0109] For example, the anode layer 240 is located on the side of the pixel definition layer 230 near the substrate 210. At least a portion of the anode layer 240 overlaps with the opening 320. The portion of the anode layer 240 that overlaps with the opening 320 is not covered by the pixel definition layer 230. The portion of the anode layer 240 that overlaps with the opening 320 is connected to the hole function layer 250 so as to be connected to the light-emitting layer 110 through the hole function layer 250.

[0110] Figure 6 As shown, at the opening 320, the hole functional layer 250 is disposed on the side of the anode layer 240 away from the circuit layer 220, and the multilayer light-emitting structure 100 (as shown) Figure 3 The hole functional layer 250 (as shown) is located on the side of the multilayer light-emitting structure 100 away from the anode layer 240. The electron functional layer 260 is located on the side of the multilayer light-emitting structure 100 away from the hole functional layer 250, and the cathode layer 270 is located on the side of the electron functional layer 260 away from the multilayer light-emitting structure 100. That is, at the opening 320, the anode layer 240, the hole functional layer 250, the charge generation layer 120, the electron functional layer 260, and the cathode layer 270 are stacked. The light-emitting layer 110 is located between the hole functional layer 250 and the electron functional layer 260. The anode layer 240 is connected to the light-emitting layer 110 and the charge generation layer 120 through the hole functional layer 250, and the cathode layer 270 is connected to the light-emitting layer 110 and the charge generation layer 120 through the electron functional layer 260.

[0111] Circuit layer 220 is used to input drive signals to anode layer 240.

[0112] The anode layer 240 is used to receive the drive signal from the circuit layer 220, and the cathode layer 270 is used to receive the reference voltage signal (or cathode power signal) so that a drive voltage is formed between the anode layer 240 and the cathode layer 270, thereby causing the anode layer 240 to generate holes and the cathode layer 270 to generate electrons, so that the light-emitting layer 110 located between the anode layer 240 and the cathode layer 270 emits light.

[0113] like Figure 6 As shown, by way of example, at the opening 320, the anode layer 240, the hole functional layer 250, the second light-emitting layer 110b, the charge-generating layer 120, the first light-emitting layer 110a, the electronic functional layer 260 and the cathode layer 270 are stacked in sequence and connected in series. The hole functional layer 250, the second light-emitting layer 110b, the charge-generating layer 120, the first light-emitting layer 110a, the electronic functional layer 260 and the cathode layer 270 are all located on the side of the anode layer 240 away from the circuit layer 220.

[0114] like Figure 5 As shown, the anode layer 240 includes a plurality of anode units 241 corresponding one-to-one with the openings 320, and the plurality of anode units 241 are arranged at intervals. Figure 6As shown, the anode unit 241 is disposed at the corresponding opening 320. At least a portion of the anode unit 241 overlaps with the corresponding opening 320. The overlapping portion of the anode unit 241 and the corresponding opening 320 is not covered by the pixel definition layer 230. The overlapping portion of the anode unit 241 and the corresponding opening 320 is connected to the hole function layer 250. The anode unit 241 is connected to the light-emitting unit 111 disposed in the corresponding opening 320 through the hole function layer 250. The anode unit 241 is in contact with and electrically connected to the circuit layer 220. The anode unit 241 is used to generate holes under an applied driving voltage. The holes from the anode unit 241 will move towards the light-emitting unit 111 disposed in the corresponding opening 320 under the drive of the applied driving voltage, so as to drive the light-emitting unit 111 disposed in the corresponding opening 320 to emit light.

[0115] The circuit layer 220 may include a drive circuit corresponding to the anode unit 241. The anode unit 241 is electrically connected to the corresponding drive circuit, and the drive circuit is used to input a drive signal to the corresponding anode unit 241.

[0116] For example, the driving circuit can be a thin film transistor (TFT) driving circuit.

[0117] For example, after the pixel definition layer 230, the support 280 and the anode layer 240 are formed, the display panel 10 can be formed by depositing a hole function layer 250, a charge generation layer 120, an electron function layer 260 and a cathode layer 270 on the surface of the portion of the anode layer 240 that overlaps with the opening 320, on the surface of the pixel definition layer 230 and the support 280, and depositing a light-emitting layer 110 in the opening 320.

[0118] For example, after the pixel definition layer 230, the support 280, and the anode layer 240 are formed, a hole functional layer 250 can be deposited on the surface of the pixel definition layer 230, the surface of the support 280, and the surface of the anode layer 240 overlapping with the opening 320 by vapor deposition. After the hole functional layer 250 is formed, a first light-emitting unit 111a can be deposited on the surface of the portion of the hole functional layer 250 located within the opening 320 by vapor deposition to form a first light-emitting layer 110a. After the first light-emitting layer 110a is formed, a charge-generating layer 120 can be deposited on the surface of the first light-emitting layer 110a and the surface of the portion of the hole functional layer 250 not covered by the first light-emitting layer 110a by vapor deposition. After the charge-generating layer 120 is formed, a second light-emitting unit 111b can be deposited on the surface of the portion of the charge-generating layer 120 located within the opening 320 by vapor deposition to form a second light-emitting layer 110b. After the second light-emitting layer 110b is formed, an electronic functional layer 260 can be deposited on the surface of the second light-emitting layer 110b and on the surface of the portion of the charge-generating layer 120 not covered by the second light-emitting layer 110b by vapor deposition. After the electronic functional layer 260 is formed, a cathode layer 270 can be deposited on the surface of the electronic functional layer 260 by vapor deposition.

[0119] like Figures 5-7 As shown, after the display panel 10 is formed, the pixel definition layer 230 and portions of the hole function layer 250, the charge generation layer 120, the electronic function layer 260, and the cathode layer 270 are stacked together. The support 280 and portions of the hole function layer 250, the charge generation layer 120, the electronic function layer 260, and the cathode layer 270 are stacked together. The portions of the hole function layer 250, the charge generation layer 120, the electronic function layer 260, and the cathode layer 270 are located within the opening 320 and are stacked on the surface of the anode layer 240. The light-emitting layer 110 is located within the opening 320 and between the electronic function layer 260 and the hole function layer 250.

[0120] like Figure 6As shown, a portion of the hole functional layer 250 is located within the opening 320 and is disposed on the surface of the portion where the anode unit 241 overlaps with the opening 320. The anode unit 241 is connected to the portion of the hole functional layer 250 located within the corresponding opening 320. The light-emitting unit 111 is disposed on the side of the hole functional layer 250 away from the anode unit 241. The anode unit 241 is connected to the light-emitting unit 111 disposed within the corresponding opening 320 through the portion of the hole functional layer 250 located within the corresponding opening 320. A portion of the charge generating layer 120 is located within the opening 320. Multiple light-emitting units 111 disposed within the same opening 320 are connected in series through the portion of the charge generating layer 120 located within that opening 320. A portion of the electron functional layer 260 is located within the opening 320, and a portion of the cathode layer 270 is located within the opening 320. The light-emitting unit 111 is connected to the portion of the cathode layer 270 located within the corresponding opening 320 through the portion of the electron functional layer 260 located within the corresponding opening 320.

[0121] like Figure 6 As shown, exemplarily, the second light-emitting unit 111b is stacked on the side of the hole functional layer 250 away from the anode unit 241. The anode unit 241 is connected to the second light-emitting unit 111b disposed in the corresponding opening 320 through the portion of the hole functional layer 250 located within the corresponding opening 320. The first light-emitting unit 111a is stacked on the side of the second light-emitting unit 111b away from the hole functional layer 250. The first light-emitting unit 111a and the second light-emitting unit 111b disposed in the same opening 320 are connected in series through the portion of the charge generating layer 120 located within the opening 320. The first light-emitting unit 111a is connected to the portion of the cathode layer 270 located within the corresponding opening 320 through the portion of the electron functional layer 260 located within the corresponding opening 320. That is, at the opening 320, the anode unit 241, the hole functional layer 250, the second light-emitting unit 111b, the charge generating layer 120, the first light-emitting unit 111a, the electron functional layer 260, and the cathode layer 270 are stacked. Figure 5 , Figure 7 As shown, portions of the hole functional layer 250, the charge generation layer 120, the electron functional layer 260, and the cathode layer 270 are located outside the opening 320. These portions are stacked with the pixel definition layer 230. The hole functional layer 250 is disposed on the surface of the pixel definition layer 230 and the surface of the support 280, with the support 280 located between the hole functional layer 250 and the pixel definition layer 230. The charge generation layer 120, the electron functional layer 260, and the cathode layer 270 are located on the side of the hole functional layer 250 furthest from the pixel definition layer 230. In other words, Figure 8 This is a cross-sectional schematic diagram of a structural layer disposed on the surface of a pixel definition layer and the surface of a support of a display panel, as provided in an embodiment of this application. Figure 7 , Figure 8 As shown, at pixel definition layer 230, hole function layer 250, charge generation layer 120, electron function layer 260 and cathode layer 270 are stacked. Charge generation layer 120 is located on the side of hole function layer 250 away from pixel definition layer 230, electron function layer 260 is located on the side of charge generation layer 120 away from pixel definition layer 230, and cathode layer 270 is located on the side of electron function layer 270 away from charge generation layer 120.

[0122] like Figure 7 As shown, a hole functional layer 250, a charge generation layer 120, an electron functional layer 260, and a cathode layer 270 are sequentially stacked on the surface of the support 280. That is, the support 280 is located between the charge generation layer 120 and the pixel definition layer 230, between the electron functional layer 260 and the pixel definition layer 230, and between the cathode layer 270 and the pixel definition layer 230.

[0123] Continue reading Figure 5 As shown, the display panel 10 also includes a cover plate 400. The cover plate 400 is disposed on the side of the cathode layer 270 away from the electronic functional layer 260. The cover plate 400 is used to enclose and form an encapsulation space. The circuit layer 220, pixel definition layer 230, anode layer 240, hole functional layer 250, multilayer light-emitting structure 100, electronic functional layer 260, cathode layer 270 and support 280 are all located in the encapsulation space to facilitate the encapsulation of the display panel 10. The cover plate 400 can protect the structural layers in the encapsulation space.

[0124] In some examples, the cover plate 400 can be a rigid plate.

[0125] For example, the material of the cover plate 400 may include, but is not limited to, glass, plastic, ceramic, etc.

[0126] In some examples, the cover plate 400 can be sealed to the substrate 210 via the sealing structure 500, and the cover plate 400, the sealing structure 500 and the substrate 210 enclose an encapsulation space.

[0127] For example, the sealing structure 500 can be a sealant, such as when the cover plate 400 is made of glass, the sealing structure 500 can be a glass (frit) sealant.

[0128] In related technologies, Tandem OLED display panels are prone to problems such as localized low brightness and bright spots.

[0129] According to the inventor's research and analysis, the Tandem OLED display panel is prone to problems such as localized low brightness and bright spots because the cover plate deforms under pressure. After deformation, the cover plate presses against the support and the structural layers (including the hole functional layer, charge generation layer, electron functional layer, and cathode layer) on the support surface. After the cover plate presses against the support and the structural layers on the support surface, it forms a localized stress stacking feature at the support. After the support and the structural layers on the support surface are repeatedly pressed or subjected to excessive pressure, the structural layers on the support surface are prone to damage. In other words, the parts of the hole functional layer, charge generation layer, electron functional layer, and cathode layer located on the support surface are easily crushed. After the electron functional layer is crushed, the cathode layer and charge generation layer are prone to contact, causing a short circuit between the cathode layer and the charge generation layer.

[0130] Figure 9 This is a schematic diagram of the circuit connection for normal driving of the multi-layer light-emitting layers of a display panel. The dashed arrows in the diagram indicate the direction of current flow.

[0131] like Figure 9 As shown, during normal operation of the multilayer light-emitting layer 110, the current between the cathode layer 270 and the anode layer 240 flows sequentially through the light-emitting units 111 located in each light-emitting layer 110, driving the light-emitting units 111 of each light-emitting layer 110 to emit light. For example, the current between the anode layer 240 and the cathode layer 270 flows sequentially through the first light-emitting unit 111a of the first light-emitting layer 110a and the second light-emitting unit 111b of the second light-emitting layer 110b connected in series, driving the first light-emitting unit 111a and the second light-emitting unit 111b to emit light.

[0132] Figure 10 This is a schematic diagram of the circuit connection when the charge generation layer and the cathode layer of the display panel are short-circuited. The dashed arrows in the diagram indicate the direction of current flow.

[0133] like Figure 10As shown, after the cathode layer 270 and the charge generation layer 120 are short-circuited, the current flowing to the charge generation layer 120 at the short-circuit point will flow directly to the cathode layer 270 through the short-circuit point. This results in no current flowing through the light-emitting unit 111 between the short-circuited cathode layer 270 and the charge generation layer 120. The current flowing through the light-emitting unit 111 between the anode layer 240 and the short-circuited charge generation layer 120 increases, causing abnormal light emission of the light-emitting unit 111 between the anode layer 240 and the short-circuited charge generation layer 120. This leads to problems such as low brightness and bright spots easily appearing at the short-circuit point between the cathode layer 270 and the charge generation layer 120. For example, after the cathode layer 270 and the charge generation layer 120 are short-circuited, no current flows through the first light-emitting unit 111a at the short-circuit point of the cathode layer 270 and the charge generation layer 120, while the current flowing through the second light-emitting unit 111b at the short-circuit point of the cathode layer 270 and the charge generation layer increases, causing the second light-emitting unit 111b at the short-circuit point of the cathode layer 270 and the charge generation layer to emit light abnormally.

[0134] like Figure 4 , Figure 5 As shown, based on this, in this embodiment of the application, the display panel 10 has an isolation groove 310, which is disposed around the outside of the support 280. The display panel 10 has an isolation region S1 located inside the isolation groove 310 and a functional region S2 located outside the isolation groove 310. The support 280 is located in the isolation region S1, and the light-emitting layer 110 is located in the functional region S2. Figure 7 As shown, the isolation groove 310 penetrates at least one of the cathode layer 270 and the charge generation layer 120 along the thickness direction of the display panel 10, so that at least one of the cathode layer 270 and the charge generation layer 120 is partially disconnected on both sides of the isolation groove 310.

[0135] In this embodiment, the isolation trench 310 penetrating a structural layer means that the isolation trench 310 penetrates both opposite surfaces of the structural layer. For example, the isolation trench 310 penetrating the cathode layer 270 along the thickness direction of the display panel 10 means that the isolation trench 310 penetrates both sides of the cathode layer 270 along the thickness direction of the display panel 10. Similarly, the isolation trench 310 penetrating the charge generation layer 120 along the thickness direction of the display panel 10 means that the isolation trench 310 penetrates both sides of the charge generation layer 120 along the thickness direction of the display panel 10.

[0136] In this way, by setting the isolation groove 310, the display panel 10 forms an isolation area S1 located inside the isolation groove 310 and a functional area S2 located outside the isolation groove 310. The support body 280 and the part of the structural layer on the surface of the support body 280 are located in the isolation area S1. The part of the structural layer on the surface of the support body 280 is easily damaged by compression. In other words, the easily damaged part of the structural layer is located in the isolation area S1. The portion of the light-emitting layer 110 and the portion of the structural layer connected to the light-emitting layer 110 are located in the functional region S2. At least one of the cathode layer 270 and the charge-generating layer 120 is disconnected on both sides of the isolation trench 310. This ensures that even if the portion of the cathode layer 270 located in the isolation region S1 makes electrical contact with the portion of the charge-generating layer 120 located in the isolation region S1, the portion of the cathode layer 270 located in the functional region S2 and connected to the light-emitting layer 110 and the portion of the charge-generating layer 120 located in the functional region S2 and connected to the light-emitting layer 110 will not short-circuit. In other words, the portion of the cathode layer 270 connected to the light-emitting layer 110 and the portion of the charge-generating layer 120 connected to the light-emitting layer 110 are less likely to short-circuit due to damage to the structural layer on the surface of the support 280. This makes the Tandem OLED display panel less prone to problems such as low brightness and bright spots due to damage to the structural layer on the surface of the support 280, which helps to improve the reliability of the display panel 10. In addition, the light-emitting layer 110 and the portion connected to the structural layer and the light-emitting layer 110 are located in the functional region S2, and the isolation groove 310 is located outside the functional region S2. The isolation groove 310 is not likely to affect the connection of the light-emitting layer 110, which is conducive to maintaining the cooperation performance of the light-emitting layer 110 and the structural layers connected to the light-emitting layer 110, and conducive to maintaining the stability and reliability of the light emission of the multi-layer light-emitting structure 100.

[0137] When the display panel 10 includes a cover plate 400 and is encapsulated through the cover plate 400, due to the setting of the isolation groove 310, the part of the cathode layer 270 connected to the light-emitting layer 110 and the part of the charge generation layer 120 connected to the light-emitting layer 110 are less likely to have problems such as low brightness and bright spots due to the structural layer on the surface of the support 280 being crushed by the cover plate 400.

[0138] The surface of the pixel definition layer 230 is provided with a plurality of spaced supports 280 to facilitate stable support of the mask.

[0139] In some possible implementations, at least one isolation groove 310 is disposed around the outside of a plurality of supports 280, such that at least one isolation region S1 has a plurality of supports 280, and no light-emitting unit 111 is provided between two adjacent supports 280 located in the same isolation region S1.

[0140] like Figure 4 , Figure 5As shown, in some other possible embodiments, the display panel 10 has a plurality of isolation slots 310 corresponding one-to-one with the support 280, each isolation slot 310 being disposed around the outside of the corresponding support 280. The display panel 10 has a plurality of isolation regions S1 corresponding one-to-one with the support 280, each isolation region S1 corresponding to the support 280 being located inside the corresponding isolation slot 310, and each support 280 being located in the corresponding isolation region S1, that is, each isolation region S1 is provided with one support 280.

[0141] This facilitates the isolation of the portion of the structural layer located on the surface of each support 280, resulting in better reliability of the display panel 10. Furthermore, it allows for a smaller footprint for each isolation region S1 and each isolation groove 310, minimizing the impact of the isolation groove 310 on the portion where the structural layer connects to the light-emitting layer 110. Additionally, it facilitates the placement of light-emitting units 111 between adjacent supports 280, allowing for more flexible arrangement of the light-emitting units 111 and the supports 280.

[0142] For example, the shape of the inner edge of the projection of the isolation groove 310 along the thickness direction of the display panel 10 is the same as the shape of the outer edge of the projection of the end of the corresponding support 280 connected to the pixel definition layer 230 along the thickness direction of the display panel 10. The distance between each position of the inner edge of the projection of the isolation groove 310 along the thickness direction of the display panel 10 and the outer edge of the projection of the end of the corresponding support 280 connected to the pixel definition layer 230 along the thickness direction of the display panel 10 is equal. In this way, the area occupied by each isolation region S1 and each isolation groove 310 can be smaller, so that the influence of the isolation groove 310 on the light emission of the light-emitting unit 111 is smaller.

[0143] In some examples, the support 280 can be a block-shaped structure, making the support 280 more stable in supporting the mask. For example, the projection of the end of the support 280 connected to the pixel definition layer 230 along the thickness direction of the display panel 10 is rectangular, and the inner edge of the corresponding isolation groove 310 along the projection of the display panel 10 is a rectangle that coincides with the center of the projection of the end of the support 280 connected to the pixel definition layer 230 along the thickness direction of the display panel 10.

[0144] In other examples, the support 280 can be a columnar structure. For example, the projection of the end of the support 280 connected to the pixel definition layer 230 along the thickness direction of the display panel 10 is circular, and the inner edge of the corresponding isolation groove 310 along the projection of the display panel 10 is a circle that coincides with the center of the projection of the end of the support 280 connected to the pixel definition layer 230 along the thickness direction of the display panel 10.

[0145] like Figure 7As shown, in some possible embodiments, the isolation trench 310 divides the cathode layer 270 into a first cathode portion 271 located in the isolation region S1 and a second cathode portion 272 located in the functional region S2. The first cathode portion 271 and the second cathode portion 272 are disconnected, that is, the isolation trench 310 penetrates the cathode layer 270 and disconnects the portion of the cathode layer 270 on both sides of the isolation trench 310 into the first cathode portion 271 and the second cathode portion 272. The projection of the support body 280 along the thickness direction of the display panel 10 is located within the projection of the first cathode portion 271 along the thickness direction of the display panel 10, that is, the projection of the support body 280 along the thickness direction of the display panel 10 is located outside the projection of the second cathode portion 272 along the thickness direction of the display panel 10. The projection of the light-emitting layer 110 along the thickness direction of the display panel 10 is located within the projection of the second cathode portion 272 along the thickness direction of the display panel 10, that is, the projection of the light-emitting layer 110 along the thickness direction of the display panel 10 is located outside the projection of the first cathode portion 271 along the thickness direction of the display panel 10. The second cathode portion 272 is connected to the light-emitting layer 110 and is used to drive the light-emitting layer 110 to emit light. Specifically, the second cathode portion 272 is connected to the light-emitting layer 110 through the electronic functional layer 260. The second cathode portion 272 is used to receive a reference voltage signal and to generate electrons under an applied driving voltage.

[0146] Thus, the first cathode portion 271 is located in the isolation region S1. The first cathode portion 271 is prone to electrical contact with the charge generation layer 120 due to damage to the structural layer on the surface of the support 280. The second cathode portion 272 is located in the functional region S2. The second cathode portion 272 is connected to the light-emitting layer 110 and is used to drive the light-emitting layer 110 to emit light. The first cathode portion 271 and the second cathode portion 272 are separated into two disconnected parts by the isolation trench 310. This ensures that even if the first cathode portion 271 makes electrical contact with the charge generation layer 120, the second cathode portion 272 will not short-circuit with the charge generation layer 120. This makes the Tandem OLED display panel less prone to problems such as low brightness and bright spots due to damage to the structural layer on the surface of the support 280, thus improving the reliability of the display panel 10. Furthermore, the projection of the light-emitting layer 110 along the thickness direction of the display panel 10 is located within the projection of the second cathode portion 272 along the thickness direction of the display panel 10, making it less likely that the isolation groove 310 will affect the connection between the cathode layer 270 and the light-emitting layer 110, which is beneficial to maintaining the matching performance between the cathode layer 270 and the light-emitting layer 110, and to maintaining the stability and reliability of the light emission of the multilayer light-emitting structure 100.

[0147] The projections of all light-emitting units 111 along the thickness direction of the display panel 10 are all located within the projection of the second cathode portion 272 along the thickness direction of the display panel 10. That is, the projections of all light-emitting units 111 along the thickness direction of the display panel 10 are all located outside the projection of the first cathode portion 271 along the thickness direction of the display panel 10. The second cathode portion 272, the electronic functional layer 260, the first light-emitting unit 111a disposed in the same opening 320, the charge generation layer 120, the second light-emitting unit 111b disposed in the same opening 320, the hole functional layer 250, and the anode unit 241 disposed in the same opening 320 are connected in series.

[0148] In an example where the display panel 10 has a plurality of isolation grooves 310 corresponding one-to-one with the support 280, the cathode layer 270 includes a plurality of first cathode portions 271 corresponding one-to-one with the support 280. The first cathode portions 271 corresponding to the support 280 are formed by being separated by the corresponding isolation grooves 310. The first cathode portions 271 corresponding to the support 280 are located in the corresponding isolation region S1. Each first cathode portion 271 is disconnected from the second cathode portion 272. The projection of the support 280 along the thickness direction of the display panel 10 is located within the projection of the corresponding first cathode portion 271 along the thickness direction of the display panel 10.

[0149] In some possible implementations, the isolation groove 310 divides the charge generation layer 120 into a first charge generation portion 121 located in the isolation region S1 and a second charge generation portion 122 located in the functional region S2. The first charge generation portion 121 and the second charge generation portion 122 are disconnected. That is, the isolation groove 310 penetrates the charge generation layer 120 and disconnects the portion of the charge generation layer 120 on both sides of the isolation groove 310 into the first charge generation portion 121 and the second charge generation portion 122. The projection of the support body 280 along the thickness direction of the display panel 10 is located within the projection of the first charge generation portion 121 along the thickness direction of the display panel 10. That is, the projection of the support body 280 along the thickness direction of the display panel 10 is located outside the projection of the second charge generation portion 122 along the thickness direction of the display panel 10. The projection of the light-emitting layer 110 along the thickness direction of the display panel 10 lies within the projection of the second charge-generating portion 122 along the thickness direction of the display panel 10. In other words, the projection of the light-emitting layer 110 along the thickness direction of the display panel 10 lies outside the projection of the first charge-generating portion 121 along the thickness direction of the display panel 10. The second charge-generating portion 122 is connected to the light-emitting layer 110 and is used to drive the light-emitting layer 110 to emit light. Specifically, the cathode layer 270 is connected to the second charge-generating portion 122 via the electronic functional layer 260 and the light-emitting layer 110. The second charge-generating portion 122 is used to facilitate additional charge injection to ensure that electrons and holes can be effectively transferred from one light-emitting layer 110 to the next.

[0150] In this way, the first charge generating part 121 is located in the isolation region S1. The first charge generating part 121 is prone to electrical contact with the cathode layer 270 due to damage to the structural layer on the surface of the support 280. The second charge generating part 122 is located in the functional region S2. The second charge generating part 122 is connected to the light-emitting layer 110 and is used to drive the light-emitting layer 110 to emit light. The first charge generating part 121 and the second charge generating part 122 are separated into two disconnected parts by the isolation trench 310, so that even if the first charge generating part 121 is in electrical contact with the cathode layer 270, the second charge generating part 122 will not be short-circuited with the cathode layer 270. This makes the Tandem OLED display panel less prone to problems such as low brightness and bright spots due to damage to the structural layer on the surface of the support 280, which helps to improve the reliability of the display panel 10. Furthermore, the projection of the light-emitting layer 110 along the thickness direction of the display panel 10 is located within the projection of the second charge generating part 122 along the thickness direction of the display panel 10, making it less likely that the isolation groove 310 will affect the connection between the charge generating layer 120 and the light-emitting layer 110, which is beneficial to maintaining the matching performance between the charge generating layer 120 and the light-emitting layer 110, and to maintaining the stability and reliability of the light emission of the multilayer light-emitting structure 100.

[0151] The projections of all light-emitting units 111 along the thickness direction of the display panel 10 are all located within the projection of the second charge generating part 122 along the thickness direction of the display panel 10. That is, the projections of all light-emitting units 111 along the thickness direction of the display panel 10 are all located outside the projection of the first charge generating part 121 along the thickness direction of the display panel 10. The cathode layer 270, the electronic functional layer 260, the first light-emitting unit 111a disposed in the same opening 320, the second charge generating part 122, the second light-emitting unit 111b disposed in the same opening 320, the hole functional layer 250, and the anode unit 241 disposed in the same opening 320 are connected in series.

[0152] In the example where the display panel 10 has a plurality of isolation grooves 310 corresponding one-to-one with the support 280, the charge generation layer 120 includes a plurality of first charge generation parts 121 corresponding one-to-one with the support 280. The first charge generation parts 121 corresponding to the support 280 are separated by the corresponding isolation grooves 310. The first charge generation parts 121 corresponding to the support 280 are located in the corresponding isolation area S1. Each first charge generation part 121 is disconnected from the second charge generation part 122. The projection of the support 280 along the thickness direction of the display panel 10 is located within the projection of the corresponding first charge generation part 121 along the thickness direction of the display panel 10.

[0153] For example, the isolation trench 310 may penetrate only the cathode layer 270, or only the charge generation layer 120, or both the cathode layer 270 and the charge generation layer 120. Figure 7As shown, exemplarily, the isolation trench 310 divides the cathode layer 270 into a first cathode portion 271 and a second cathode portion 272, and divides the charge generation layer 120 into a first charge generation portion 121 and a second charge generation portion 122. The first cathode portion 271 and the first charge generation portion 121 are located in the isolation region S1, and the second cathode portion 272 and the second charge generation portion 122 are located in the functional region S2. The first cathode portion 271 and the second cathode portion 272 are disconnected, and the first charge generation portion 121 and the second charge generation portion 122 are disconnected. That is, the isolation trench 310 penetrates the cathode layer 270 and the charge generation layer 120, and divides the portion of the cathode layer 270 located on both sides of the isolation trench 310 into the first cathode portion 271 and the second cathode portion 272, and divides the portion of the charge generation layer 120 located on both sides of the isolation trench 310 into the first charge generation portion 121 and the second charge generation portion 122.

[0154] In this way, the portion of the cathode layer 270 located on the surface of the support 280 is isolated from the portion of the cathode layer 270 connected to the light-emitting layer 110 by the isolation groove 310, and the portion of the charge-generating layer 120 located on the surface of the support 280 is isolated from the portion of the charge-generating layer 120 connected to the light-emitting layer 110 by the isolation groove 310, which helps to further reduce the risk of short circuit between the portion of the cathode layer 270 connected to the light-emitting layer 110 and the portion of the charge-generating layer 120 connected to the light-emitting layer 110.

[0155] In some examples, the isolation trench 310 extends through the cathode layer 270, the electronic functional layer 260, and the charge generation layer 120 along the thickness direction of the display panel 10.

[0156] In this way, the first cathode portion 271 and the second cathode portion 272, as well as the first charge generating portion 121 and the second charge generating portion 122, are all separated by the isolation groove 310. The projection of the first cathode portion 271 along the thickness direction of the display panel 10 coincides with the projection of the first charge generating portion 121 along the thickness direction of the display panel 10, and the projection of the second cathode portion 272 along the thickness direction of the display panel 10 coincides with the projection of the second charge generating portion 122 along the thickness direction of the display panel 10. This makes it difficult for the first cathode portion 271 to make electrical contact with the second charge generating portion 122, and the first charge generating portion 121 to make electrical contact with the second cathode portion 272. This helps to further reduce the risk of short circuit between the portion of the cathode layer 270 connected to the light-emitting layer 110 and the portion of the charge generating layer 120 connected to the light-emitting layer 110.

[0157] The second cathode portion 272, the electron functional layer 260, the first light-emitting layer 110a, the second charge generating portion 122, the second light-emitting layer 110b, the hole functional layer 250, and the anode layer 240 are connected in series. Specifically, the second cathode portion 272, the electron functional layer 260, the first light-emitting unit 111a disposed in the same opening 320, the second charge generating portion 122, the second light-emitting unit 111b disposed in the same opening 320, the hole functional layer 250, and the anode unit 241 disposed in the same opening 320 are connected in series.

[0158] like Figures 5-7 As shown, in some possible embodiments, the isolation groove 310 is located between the opening 320 and the support 280. That is, the opening 320 is located in the functional area S2.

[0159] In this way, the portion of the cathode layer 270 located in functional region S2, the portion of the electron functional layer 260 located in functional region S2, the portion of the charge generation layer 120 located in functional region S2, and the portion of the hole functional layer 250 located in functional region S2 are connected to the light-emitting layer 110 within the opening 320. The opening of the isolation groove 310 has little impact on the light emission of the light-emitting layer 110 located within the opening 320, which is beneficial to maintaining the display performance of the display panel 10.

[0160] In some examples where the isolation groove 310 divides the cathode layer 270 into a first cathode portion 271 and a second cathode portion 272 that are disconnected from each other, the projection of the opening 320 along the thickness direction of the display panel 10 is located within the projection of the second cathode portion 272 along the thickness direction of the display panel 10, so as to facilitate the connection between the second cathode portion 272 and the light-emitting layer 110 in the opening 320.

[0161] In some examples where the isolation groove 310 divides the charge generation layer 120 into a first charge generation section 121 and a second charge generation section 122 that are disconnected from each other, the projection of the opening 320 along the thickness direction of the display panel 10 is located within the projection of the second charge generation section 122 along the thickness direction of the display panel 10, so as to facilitate the connection between the second charge generation section 122 and the light-emitting layer 110 in the opening 320.

[0162] In some possible implementations, the isolation trench 310 extends through the cathode layer 270, the electronic functional layer 260, the charge generation layer 120, and the hole functional layer 250 along the thickness direction of the display panel 10. The bottom of the isolation trench 310 is located within the pixel definition layer 230. That is, the bottom of the isolation trench 310 is located between the side surface of the pixel definition layer 230 away from the cover plate 400 and the side surface of the pixel definition layer 230 close to the cover plate 400. A portion of the isolation trench 310 is located within the pixel definition layer 230, and the bottom of the isolation trench 310 extends into the pixel definition layer 230.

[0163] In this way, when forming the pixel definition layer 230, a groove can be formed on the side of the pixel definition layer 230 away from the circuit layer 220. When forming the hole functional layer 250, charge generation layer 120, electron functional layer 260, and cathode layer 270 on the surfaces of the pixel definition layer 230 and the support 280, the materials used to form the hole functional layer 250, the charge generation layer 120, the electron functional layer 260, and the cathode layer 270 will be deposited in the groove. This will cause the hole functional layer 250, the charge generation layer 120, the electron functional layer 260, and the cathode layer 270 to be discontinuously deposited in the groove, forming a broken structure. The discontinuous deposition of the energy layer 260 and the cathode layer 270 at the groove creates a break structure, which together with the groove forms an isolation trench 310 that penetrates the cathode layer 270, the electronic functional layer 260, the charge generation layer 120, and the hole functional layer 250. In this way, a groove can be formed on the side of the pixel definition layer 230 away from the circuit layer 220 using a common mask. Then, when the hole functional layer 250, the charge generation layer 120, the electronic functional layer 260, and the cathode layer 270 are formed by vapor deposition, the hole functional layer 250, the charge generation layer 120, the electronic functional layer 260, and the cathode layer 270 naturally break to form a break structure, thus forming the isolation trench 310. In other words, the isolation trench 310 does not require the use of a fine metal mask (FMM), which reduces the cost of forming the isolation trench 310. At this time, the bottom of the groove, that is, the bottom of the isolation groove 310, contains materials for forming the hole functional layer 250, materials for forming the charge generation layer 120, materials for forming the electron functional layer 260, and materials for forming the cathode layer 270.

[0164] In addition, when multiple charge generation layers 120 are provided between the electronic functional layer 260 and the hole functional layer 250, it is easier to form an isolation trench 310 that penetrates all charge generation layers 120 by passing through all the charge generation layers 120 through the isolation trench 310 whose bottom is located in the pixel definition layer 230.

[0165] In some of the isolation trenches 310, the bottom of the trench is located within the pixel definition layer 230. The distance between the bottom of the isolation trench 310 and the side surface of the pixel definition layer 230 near the hole function layer 250 is H1, and the distance between the side surface of the pixel definition layer 230 near the hole function layer 250 and the side surface of the cathode layer 270 away from the pixel definition layer 230 is H2, where H1 > H2.

[0166] In this way, the material for forming the cathode layer 270 contained in the isolation groove 310 is spaced apart on the side of the hole functional layer 250 away from the cover plate 400, so that the first charge generating part 121 and the second charge generating part 122 are not easily connected through the material for forming the cathode layer 270 contained in the isolation groove 310 or the material for forming the charge generating layer 120 contained in the isolation groove 310, and the first cathode part 271 and the second cathode part 272 are not easily connected through the material for forming the cathode layer 270 contained in the isolation groove 310, which is conducive to isolating the first cathode part 271 and the second cathode part 272, as well as isolating the first charge generating part 121 and the second charge generating part 122.

[0167] In some possible implementations, multiple charge generation layers 120 are provided between the electronic functional layer 260 and the hole functional layer 250. That is, at least three light-emitting layers 110 are provided between the electronic functional layer 260 and the hole functional layer 250. When the isolation trench 310 penetrates through the charge generation layers 120, the isolation trench 310 penetrates all the charge generation layers 120. This makes it less likely for the portion of the cathode layer 270 connected to the light-emitting layer 110 and the portion of each charge generation layer 120 connected to the light-emitting layer 110 to be short-circuited, thus improving the reliability of the display panel 10.

[0168] For example, in addition to the first light-emitting layer 110a and the second light-emitting layer 110b, a third light-emitting layer is provided between the first light-emitting layer 110a and the second light-emitting layer 110b, a charge-generating layer 120 is provided between the first light-emitting layer 110a and the third light-emitting layer, and a charge-generating layer 120 is provided between the second light-emitting layer 110b and the third light-emitting layer. The isolation groove 310 penetrates the charge-generating layer 120 provided between the first light-emitting layer 110a and the third light-emitting layer, as well as the charge-generating layer 120 provided between the second light-emitting layer 110b and the third light-emitting layer.

[0169] In some examples where multiple charge generation layers 120 are provided between the electronic functional layer 260 and the hole functional layer 250, the isolation trench 310 penetrates the cathode layer 270, the electronic functional layer 260, the hole functional layer 250 and all the charge generation layers 120, and the bottom of the isolation trench 310 is located within the pixel definition layer 230.

[0170] In some possible implementations, the projection of the isolation groove 310 along the thickness direction of the display panel 10 is located within the projection along the thickness direction of the side surface of the support 280 on the pixel definition layer 230.

[0171] In this way, the isolation groove 310 is less likely to affect the connection of the cathode layer 270, electron functional layer 260, light-emitting layer 110, charge-generating layer 120, and hole functional layer 250 within the opening 320. Furthermore, the isolation groove 310 has minimal impact on the light emission of the light-emitting unit 111 located within the opening 320, which is beneficial for maintaining the display performance of the display panel 10. Additionally, the isolation groove 310 is easily formed by creating a groove on the pixel definition layer 230 and by allowing the hole functional layer 250, charge-generating layer 120, electron functional layer 260, and cathode layer 270 to naturally break during their formation, creating a disconnected structure.

[0172] For example, the width of the isolation groove 310 can be greater than or equal to 2 micrometers and less than or equal to 4 micrometers. In this way, while making it less likely for the portion of the cathode layer 270 connected to the light-emitting layer 110 to short-circuit with the portion of the charge-generating layer 120 connected to the light-emitting layer 110, the isolation groove 310 occupies a small area of ​​the board and has little impact on the layout of the display panel 10 (e.g., the layout of the opening 320, the layout of the support 280).

[0173] like Figure 4 As shown, in some possible implementations, the isolation groove 310 is an annular groove with a closed-loop structure.

[0174] This makes it easier to divide the middle area of ​​the display panel 10 into an isolation area S1 by the isolation groove 310, and the position of the isolation area S1 is more flexible.

[0175] For example, the isolation groove 310 with a closed-loop structure can be a circular groove, a square groove, a polygonal groove, etc. That is to say, the outer edge of the projection of the isolation groove 310 with a closed-loop structure along the thickness direction of the display panel 10 can be a circle, a square, a polygon, etc.

[0176] In some other possible implementations, at least part of the isolation groove 310 may also be an open-loop structure with a notch, such as a semi-ring structure. The isolation groove 310 with the notch can extend to the edge of the display panel 10 and form an isolation area S1 by cooperating with the edge of the display panel 10.

[0177] Figure 11 This is a cross-sectional schematic diagram of the support of another display panel provided in an embodiment of this application.

[0178] like Figure 11As shown, in some other examples where the isolation trench 310 divides the cathode layer 270 into mutually disconnected first cathode portions 271 and second cathode portions 272, the isolation trench 310 is located on the side of the charge generation layer 120 away from the pixel definition layer 230. That is, the isolation trench 310 penetrates the cathode layer 270 but not the charge generation layer 120, and the charge generation layer 120 is a continuous structure. The bottom of the isolation trench 310 can be located on the surface of the electronic functional layer 260 away from the charge generation layer 120. This makes it easier to prevent short circuits between the portion of the cathode layer 270 connected to the light-emitting layer 110 and the portion of each charge generation layer 120 connected to the light-emitting layer 110 when the charge generation layer 120 has multiple layers. In this case, a fine metal mask can be used to form the isolation trench 310 in the cathode layer 270 during the formation of the cathode layer 270 to divide the cathode layer 270 into mutually disconnected first cathode portions 271 and second cathode portions 272. Specifically, after the electronic functional layer 260 is formed, when the cathode layer 270 is formed by vapor deposition, a fine metal mask can be used to form an isolation trench 310 on the cathode layer 270. At this time, the isolation trench 310 is located on the side of the electronic functional layer 260 away from the pixel definition layer 230. The electronic functional layer 260 is also a continuous structure, and the electronic functional layer 260 is not penetrated by the isolation trench 310.

[0179] Figure 12 This is a cross-sectional schematic diagram of the support of another display panel provided in an embodiment of this application.

[0180] like Figure 12As shown, in some examples where the isolation trench 310 divides the charge generation layer 120 into mutually disconnected first charge generation section 121 and second charge generation section 122, the isolation trench 310 may penetrate the cathode layer 270, the electronic functional layer 260, and the charge generation layer 120, and the bottom of the isolation trench 310 may be located on the surface of the hole functional layer 250 away from the pixel definition layer 230. In this case, a fine metal mask can be used to form a groove in the charge generation layer 120 during its formation to divide the charge generation layer 120 into mutually disconnected first charge generation section 121 and second charge generation section 122. When the electronic functional layer 260 and the cathode layer 270 are formed on the surface of the charge generation layer 120, the materials used to form the electronic functional layer 260 and the cathode layer 270 are deposited in the grooves, causing discontinuous deposition of the electronic functional layer 260 and the cathode layer 270 in the grooves, forming a broken structure. This broken structure, along with the grooves, forms an isolation trench 310 that penetrates the cathode layer 270, the electronic functional layer 260, and the charge generation layer 120. At this time, portions of the cathode layer 270 and the electronic functional layer 260 sink into the isolation trench 310, forming a recessed structure. The thickness of the electronic functional layer 260 is greater than the thickness of the charge generation layer 120, making it less likely that the second charge generation section 122 will become electrically connected to the first charge generation section 121 or the cathode layer 270 due to the cathode material deposited in the grooves. The portion of the cathode layer 270 located on both sides of the isolation groove 310 can be conductive through the cathode material deposited in the groove.

[0181] Figure 13 This is a cross-sectional schematic diagram of the support of another display panel provided in an embodiment of this application.

[0182] like Figure 13As shown, in some examples where the isolation trench 310 divides the charge generation layer 120 into a first charge generation section 121 and a second charge generation section 122 that are located separately from each other, the isolation trench 310 may be located between the electronic functional layer 260 and the hole functional layer 250. The bottom of the isolation trench 310 may be located on the surface of the hole functional layer 250 away from the pixel definition layer 230. The isolation trench 310 does not penetrate the electronic functional layer 260 and the cathode layer 270. Both the electronic functional layer 260 and the cathode layer 270 can be continuous structures. The isolation trench 310 may be filled with an insulating material (e.g., the material used to form the electronic functional layer 260). In this case, when forming the charge generation layer 120, a fine metal mask may be used to form the isolation trench 310 in the charge generation layer 120 to divide the charge generation layer 120 into a first charge generation section 121 and a second charge generation section 122 that are located separately from each other. After the charge generation layer 120 is formed, an insulating material (e.g., a material used to form the electronic functional layer 260) is used to fill the isolation trench 310. After the isolation trench 310 is filled, the electronic functional layer 260 and the cathode layer 270 are formed.

[0183] In some other examples where the isolation trench 310 penetrates both the cathode layer 270 and the charge generation layer 120, the isolation trench 310 penetrates both the cathode layer 270 and the charge generation layer 120, but not the electronic functional layer 260, which is a continuous structure. The isolation trench 310 includes a first cavity and a second cavity located on both sides of the electronic functional layer 260, respectively. The first cavity penetrates the cathode layer 270, and the second cavity penetrates the charge generation layer 120. The second cavity is filled with an insulating material (e.g., a material used to form the electronic functional layer 260). In this case, a fine metal mask can be used to form the second cavity in the charge generation layer 120 during its formation to divide the charge generation layer 120 into a first charge generation portion 121 and a second charge generation portion 122 that are disconnected from each other. After the charge generation layer 120 is formed, the second cavity is filled with an insulating material (e.g., a material used to form the electronic functional layer 260). After the isolation trench 310 is filled, the electronic functional layer 260 is formed. After the electronic functional layer 260 is formed, the cathode layer 270 is formed. During the formation of the cathode layer 270, a fine metal mask can be used to form a first cavity in the cathode layer 270, dividing the cathode layer 270 into a first cathode portion 271 and a second cathode portion 272 that are disconnected from each other. In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0184] The devices or elements referred to in the embodiments of this application or implied herein must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of this application. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0185] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0186] The term "multiple" in this article refers to two or more. The term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects; in formulas, the character " / " indicates a "division" relationship between the preceding and following related objects.

[0187] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application.

[0188] It is understood that, in the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

Claims

1. A display panel (10), characterized in that, It includes a pixel definition layer (230), a support (280), a hole function layer (250), a charge generation layer (120), a light-emitting layer (110), an electronic function layer (260), and a cathode layer (270); The pixel definition layer (230) is provided with an opening (320). The support (280) is disposed on the surface of one side of the pixel definition layer (230). The hole function layer (250), the charge generation layer (120), the electron function layer (260) and the cathode layer (270) are stacked on the surface of the support (280), the surface of the pixel definition layer (230) and the opening (320). The light-emitting layer (110) is disposed in the opening (320) and located between the hole function layer (250) and the electron function layer (260). The display panel (10) has an isolation groove (310) surrounding the outside of the support (280). The display panel (10) has an isolation region (S1) located inside the isolation groove (310) and a functional region (S2) located outside the isolation groove (310). The support (280) is located in the isolation region (S1), and the light-emitting layer (110) is located in the functional region (S2). The isolation groove (310) penetrates at least one of the cathode layer (270) and the charge-generating layer (120) along the thickness direction of the display panel (10), so that at least one of the cathode layer (270) and the charge-generating layer (120) is partially disconnected on both sides of the isolation groove (310).

2. The display panel (10) according to claim 1, characterized in that, The isolation groove (310) divides the cathode layer (270) into a first cathode portion (271) located in the isolation region (S1) and a second cathode portion (272) located in the functional region (S2). The first cathode portion (271) is disconnected from the second cathode portion (272). The projection of the support body (280) along the thickness direction of the display panel (10) is located within the projection of the first cathode portion (271) along the thickness direction of the display panel (10). The projection of the light-emitting layer (110) along the thickness direction of the display panel (10) is located within the projection of the second cathode portion (272) along the thickness direction of the display panel (10). The second cathode portion (272) is connected to the light-emitting layer (110) and is used to drive the light-emitting layer (110) to emit light.

3. The display panel (10) according to claim 1 or 2, characterized in that, The isolation groove (310) divides the charge generation layer (120) into a first charge generation part (121) located in the isolation region (S1) and a second charge generation part (122) located in the functional region (S2). The first charge generation part (121) is disconnected from the second charge generation part (122). The projection of the support body (280) along the thickness direction of the display panel (10) is located within the projection of the first charge generation part (121) along the thickness direction of the display panel (10). The projection of the light-emitting layer (110) along the thickness direction of the display panel (10) is located within the projection of the second charge generation part (122) along the thickness direction of the display panel (10). The second charge generation part (122) is connected to the light-emitting layer (110) and is used to drive the light-emitting layer (110) to emit light.

4. The display panel (10) according to any one of claims 1-3, characterized in that, The isolation trench (310) extends through the cathode layer (270), the electronic functional layer (260), the charge generation layer (120), and the hole functional layer (250) along the thickness direction of the display panel (10), and the bottom of the isolation trench (310) is located within the pixel definition layer (230).

5. The display panel (10) according to claim 4, characterized in that, The distance between the bottom of the isolation trench (310) and the side surface of the pixel definition layer (230) near the hole function layer (250) is H1, and the distance between the side surface of the pixel definition layer (230) near the hole function layer (250) and the side surface of the cathode layer (270) away from the pixel definition layer (230) is H2, where H1 > H2.

6. The display panel (10) according to any one of claims 1-5, characterized in that, Multiple charge generation layers (120) are provided between the electron functional layer (260) and the hole functional layer (250), and the isolation trench (310) penetrates all the charge generation layers (120).

7. The display panel (10) according to any one of claims 1-6, characterized in that, The isolation groove (310) is located between the opening (320) and the support (280).

8. The display panel (10) according to any one of claims 1-7, characterized in that, The projection of the isolation groove (310) along the thickness direction of the display panel (10) is located within the projection of the support (280) on one side surface of the pixel definition layer (230) along the thickness direction of the display panel (10).

9. The display panel (10) according to any one of claims 1-8, characterized in that, The isolation groove (310) is an annular groove with a closed-loop structure.

10. The display panel (10) according to any one of claims 1-9, characterized in that, The surface of the pixel definition layer (230) is provided with a plurality of supports (280) spaced apart; The display panel (10) has a plurality of isolation grooves (310) corresponding one-to-one with the support (280), each isolation groove (310) is disposed around the outside of the corresponding support (280), the display panel (10) has a plurality of isolation areas (S1) corresponding one-to-one with the support (280), each isolation area (S1) corresponding to each support (280) is located inside the corresponding isolation groove (310), and each support (280) is located in the corresponding isolation area (S1).

11. The display panel (10) according to any one of claims 1-10, characterized in that, It also includes a cover plate (400); The cover plate (400) is disposed on the side of the cathode layer (270) away from the electronic functional layer (260). The cover plate (400) is used to enclose and form an encapsulation space. The pixel definition layer (230), the support (280), the hole functional layer (250), the charge generation layer (120), the light-emitting layer (110), the electronic functional layer (260) and the cathode layer (270) are all located within the encapsulation space.

12. The display panel (10) according to any one of claims 1-11, characterized in that, It also includes an anode layer (240); The anode layer (240) is disposed at the opening (320). The anode layer (240) is located on the side of the hole functional layer (250) away from the charge generating layer (120) and is connected to the light-emitting layer (110) through the hole functional layer (250). The anode layer (240) is used to drive the light-emitting layer (110) to emit light.

13. A display screen (2), characterized in that, It includes a cover plate (20) and a display panel (10) as described in any one of claims 1-12, wherein the cover plate (20) is disposed on the light-emitting side of the display panel (10).

14. An electronic device, characterized in that, It includes a housing (1) and a display screen (2) as claimed in claim 13, the display screen (2) being connected to the housing (1).

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