Display panel and display device

Abstract

This application provides a display panel and a display device. The display panel includes: a substrate, and a photocell cell unit, a transparent insulating layer, and an OLED light-emitting unit sequentially stacked on the substrate; the first electrode layer of the photocell cell unit is a light-transmitting electrode layer; the OLED light-emitting unit includes a plurality of sub-pixel light-emitting units, which are designed to be semi-transparent; the photocell cell unit and at least one of the plurality of sub-pixel light-emitting units have at least a partial overlap area in the vertical projection direction, and the light-transmitting color of the photocell cell unit is the same as the light-emitting color of the sub-pixel light-emitting unit with the overlapping area; the photocell cell unit is used to convert ambient light and / or incident light from the sub-pixel light-emitting units into electrical energy. The display panel of this application has a self-charging function and does not require a polarizer or COE structure, thus improving display brightness and contrast.

Description

Technical Field

[0001] This application belongs to the field of display technology, and more specifically, relates to a display panel and display device. Background Technology

[0002] Mobile display devices suffer from rapid power consumption during continuous use, making it difficult to meet the timely charging needs in outdoor scenarios.

[0003] As one of the mainstream display solutions for mobile display devices, the conventional design of existing RGB OLED display devices requires a polarizer or a color filter on encapsulation (COE) structure above the encapsulation layer. The main function of the polarizer and COE structure is to block ambient light from being reflected off the metal circuitry of the display device and then emitted, thereby reducing background noise and improving display contrast. At the same time, it is necessary to ensure that the light emitted by the organic light-emitting diode (OLED) light-emitting unit is emitted normally, and its transmittance needs to reach more than 44%.

[0004] However, the presence of polarizers or COE structures in existing designs can obstruct the light emission of OLED light-emitting units, limiting further improvements in display brightness. Furthermore, they fail to fully utilize ambient light resources to achieve self-charging functionality, leaving room for functional optimization and performance improvement. Summary of the Invention

[0005] The purpose of this application is to provide a display panel and display device to solve the technical problems in the prior art where the polarizer or COE structure limits the display brightness of the display device and fails to fully utilize ambient light resources to achieve self-charging function.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide a display panel, comprising: a substrate, and a photoelectric rechargeable battery unit, a transparent insulating layer, and an OLED light-emitting unit sequentially stacked on the substrate; The first electrode layer of the photoelectric rechargeable battery unit on the side closest to the OLED light-emitting unit is a light-transmitting electrode layer; The OLED light-emitting unit includes multiple sub-pixel light-emitting units, each of which emits a different color. The sub-pixel light-emitting units are designed to be semi-transparent in the vertical direction. The photoelectric rechargeable battery unit and at least one of the plurality of sub-pixel light-emitting units have at least a partial overlap area in the vertical projection direction, and the light-transmitting color of the photoelectric rechargeable battery unit is the same as the light-emitting color of the sub-pixel light-emitting unit with the overlapping area. The photoelectric rechargeable battery unit is used to convert ambient light and / or incident light from the sub-pixel light-emitting unit into electrical energy.

[0007] In one alternative embodiment of the first aspect, the side of the OLED light-emitting unit away from the substrate has no polarizer or color filter structure on the encapsulation layer.

[0008] In an optional embodiment of the first aspect, the second electrode layer of the photocell cell near the substrate has a first reflective interface, the first reflective interface being located on the side of the second electrode layer away from the substrate; the cathode layer of the OLED light-emitting unit near the substrate has a second reflective interface. A microcavity structure is formed between the cathode layer and the corresponding second electrode layer.

[0009] In an alternative embodiment of the first aspect, in the microcavity structure, the distance D between the cathode layer and the corresponding second electrode layer satisfies: D = N * (2 * n), where N is a positive integer, is the peak wavelength of the sub-pixel light-emitting unit, and n is the refractive index of the film layer between the cathode layer and the corresponding second electrode layer.

[0010] In an optional embodiment of the first aspect, the photoelectric conversion layer in the photoelectric rechargeable battery unit is made of perovskite material. The photoelectric rechargeable battery units corresponding to the sub-pixel light-emitting units with different emission colors are made of different perovskite materials. The perovskite material used in the photoelectric rechargeable battery unit corresponding to any sub-pixel light-emitting unit is at least used to transmit the emission color of the corresponding sub-pixel light-emitting unit.

[0011] In one optional embodiment of the first aspect, the plurality of sub-pixel light-emitting units include a red sub-pixel light-emitting unit, a green sub-pixel light-emitting unit, and a blue sub-pixel light-emitting unit; The photoelectric conversion layer in the photoelectric rechargeable battery unit corresponding to the red sub-pixel light-emitting unit is made of methylammonium lead tribromide material, which is used to transmit red light and absorb green and blue light. The photoelectric conversion layer in the photoelectric rechargeable battery unit corresponding to the green sub-pixel light-emitting unit is made of Ce3+-doped CsPbBr3 material. The Ce3+-doped CsPbBr3 material is used to transmit green light and absorb blue light. The photoelectric conversion layer in the photoelectric rechargeable battery unit corresponding to the blue sub-pixel light-emitting unit adopts α-phase FAPbI3 material, which is used to transmit blue light and absorb visible light across the entire wavelength range.

[0012] In one alternative embodiment of the first aspect, the transparent insulating layer is made of silicon nitride, silicon oxide, or transparent organic photoresist, and the thickness of the transparent insulating layer is 50~500nm.

[0013] In one alternative embodiment of the first aspect, the transparent insulating layer is prepared by atomic layer deposition.

[0014] In one optional embodiment of the first aspect, the red, green, and blue sub-pixel light-emitting units among the plurality of sub-pixel light-emitting units all have at least partial overlap with the photoelectric rechargeable battery unit in the vertical projection direction.

[0015] In one optional embodiment of the first aspect, a portion of the plurality of sub-pixel light-emitting units are provided with the photoelectric rechargeable battery unit on the side near the substrate, while the remaining portion of the sub-pixel light-emitting units are not provided with the photoelectric rechargeable battery unit on the side near the substrate, and the remaining portion of the sub-pixel light-emitting units are provided with a color resist layer on the side away from the substrate.

[0016] In one optional embodiment of the first aspect, the sub-pixel light-emitting unit of the portion is a sub-pixel light-emitting unit with a luminous efficiency greater than or equal to a preset luminous efficiency threshold.

[0017] In a second aspect, a display device is provided, the display device comprising a display panel as described in any one of the first aspects.

[0018] The beneficial effects of this application are as follows: In this embodiment, by sequentially stacking a photoelectric rechargeable battery unit, a transparent insulating layer, and an OLED light-emitting unit on a substrate, and making the photoelectric rechargeable battery unit and the corresponding sub-pixel light-emitting unit overlap in the vertical projection direction while maintaining the same transmitted light color and emitted light color, on the one hand, the photoelectric conversion layer can fully utilize ambient light and part of the incident light from the OLED light-emitting unit for photoelectric conversion, adding a self-charging function to the display panel, which helps to alleviate the problem of rapid power consumption when using mobile display devices and improves the battery life in outdoor scenarios; on the other hand, the photoelectric rechargeable battery unit, whose color matches that of the sub-pixel light-emitting unit, can absorb ambient light to a certain extent, reducing the background noise formed after the ambient light is reflected on the metal lines of the display device, thus eliminating the need for additional polarizers or COE structures, reducing the obstruction of light emitted by the OLED light-emitting unit, and improving the brightness of the display panel; in addition, even if there is a small amount of reflected light due to the metal lines, since the emitted light is the same as the emitted light color of the sub-pixel light-emitting unit, the display contrast can be improved. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a partial structural diagram of an existing RGB OLED display device; Figure 2 This is a schematic diagram of the structure of a display panel provided in one embodiment of this application; Figure 3 This is a detailed structural diagram of the photocell unit and the sub-pixel light-emitting unit in the display panel of an embodiment of this application; Figure 4 In the diagram, A is a schematic diagram of ambient light charging the photo-rechargeable battery unit according to an embodiment of this application; Figure 4 B in the figure is a schematic diagram of light emitted by the sub-pixel light-emitting unit in the embodiment of this application entering the photo-rechargeable battery unit for charging; Figure 5 A schematic diagram of light reflection in a microcavity structure provided in an embodiment of this application is shown; Figure 6 This paper shows a schematic diagram of the structure of different sub-pixel light-emitting units and photo-rechargeable battery units in the OLED light-emitting unit provided in the embodiments of this application; Figure 7 This is a schematic diagram of the structure of a display panel provided in another embodiment of this application; Figure 8 This is a top view of a pixel definition layer with holes punched in it, provided in an embodiment of this application. Figure 9 A schematic diagram of a structure with a light-shielding layer (insulating material) provided at the connection hole, as provided in an embodiment of this application; Figure 10 This is a schematic diagram of a structure in which a light-shielding layer (formamidine lead triiodide material) is provided at the connection hole, as provided in an embodiment of this application.

[0021] The following are the labeling elements in the figure: 10-Photoelectric rechargeable battery unit, 11-First motor layer, 12-First hole transport layer, 13-Photoelectric conversion layer, 14-First electron transport layer, 15-Second electrode layer, 20-Transparent insulating layer, 30-OLED light-emitting unit, 31-Semi-transparent cathode layer, 32-Organic light-emitting layer, 33-Transparent anode layer, 34-Sub-pixel light-emitting unit, 341-Red sub-pixel light-emitting unit, 342-Green sub-pixel light-emitting unit, 343-Blue sub-pixel light-emitting unit, 40-Encapsulation layer, 41-First inorganic encapsulation layer, 42-Organic encapsulation layer, 43-Second inorganic encapsulation layer, 50-Transparent protective layer, 60-Pixel definition layer, 61-Connection hole, 62-Pixel area, 71-First electrode, 72-Second electrode, 81-Black matrix, 82-Color resist layer, 90-Light-shielding layer. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0023] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0026] It should be understood that in the embodiments of this application, "electrical connection" can be understood as physical contact and electrical conduction between components; it can also be understood as the form in which different components in the circuit structure are connected through physical lines that can transmit electrical signals, such as copper foil of a printed circuit board (PCB) or wires.

[0027] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] In the description of the embodiments in this application, the term "and / or" 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 existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments in any suitable manner.

[0031] In the field of mobile display technology, RGB OLED displays have become one of the mainstream display solutions for mobile devices due to their advantages such as flexibility and wide color gamut. However, mobile display devices consume power quickly during continuous use, and the need for timely charging in outdoor scenarios is difficult to meet, resulting in limited battery life.

[0032] Figure 1 A partial structural schematic diagram of an existing RGB OLED display device is shown. An OLED light-emitting unit 30 is fabricated on a substrate and then encapsulated with a flexible encapsulation layer 40. A polarizer is placed on the flexible encapsulation layer 40, or a COE structure is used to replace the polarizer to achieve an ultra-thin and flexible display.

[0033] A typical COE structure includes a black matrix (BM) 81 for light blocking, a color filter (CF) layer 82 corresponding to the RGB pixels, and an overcoat layer (OC) 50. In OLED displays, both the polarizer and the COE structure primarily function to prevent ambient light from reflecting off the metal circuitry of the display device before being emitted, thereby reducing background noise caused by ambient light and improving display contrast. The polarizer or COE structure must ensure that the light emitted by the OLED light-emitting unit 30 can be emitted, and the transmittance must be at least 44%.

[0034] Note that in RGB OLED display devices, the color resist layer 82 in the COE structure is not needed to filter the light of the OLED light-emitting unit 30. The spectrum emitted by the OLED light-emitting unit 30 is already modulated to meet the display requirements, which is completely different from LCD or white organic light-emitting diode (WOLED).

[0035] The presence of polarizers or COE structures in existing designs can obstruct the light emission of OLED light-emitting units 30, limiting further improvement in display brightness. Furthermore, they fail to fully utilize ambient light resources to achieve self-charging functionality, leaving room for functional optimization and performance improvement.

[0036] Example 1: This embodiment utilizes the light absorption capability of the photoelectric rechargeable battery unit 10 to absorb ambient light, combined with the microcavity structure design, and optimizes the removal of the polarizer or COE structure above the package. In this way, while adding a self-charging function, the brightness and contrast of the light emitted by the OLED light-emitting unit 30 can be further improved, achieving a win-win situation.

[0037] Figure 2The diagram illustrates the structure of a display panel provided in this application embodiment, including: a substrate, and a photocell battery unit 10, a transparent insulating layer 20, and an OLED light-emitting unit 30 sequentially stacked on the substrate; the first electrode layer 11 of the photocell battery unit 10 near the OLED light-emitting unit 30 is a light-transmitting electrode layer; the OLED light-emitting unit 30 includes a plurality of sub-pixel light-emitting units 34, the different sub-pixel light-emitting units 34 emit different colors, and the sub-pixel light-emitting units 34 are designed to be semi-transparent in the vertical direction; the photocell battery unit 10 and at least one of the plurality of sub-pixel light-emitting units 34 have at least a partial overlap area in the vertical projection direction (i.e., the thickness direction of the substrate), and the light-transmitting color of the photocell battery unit 10 is the same as the light-emitting color of the sub-pixel light-emitting unit 34 in which the overlap area exists; the photocell battery unit 10 is used to convert ambient light and / or incident light from the sub-pixel light-emitting unit 34 that shines on the photocell battery unit 10 through the sub-pixel light-emitting unit 34 into electrical energy.

[0038] The first electrode layer 11 of the photoelectric rechargeable battery unit 10, located near the OLED light-emitting unit 30, is a light-transmitting electrode layer. This light-transmitting design reduces obstruction of the light emitted from the OLED light-emitting unit 30, facilitating light entry into the photoelectric rechargeable battery unit 10 for photoelectric conversion. The photoelectric rechargeable battery unit 10 can convert ambient light passing through the OLED light-emitting unit 30, as well as some incident light emitted by the OLED light-emitting unit 30 itself, into electrical energy, providing supplemental power to the display panel, achieving self-charging functionality, and alleviating the battery life pressure of mobile display devices during outdoor use.

[0039] like Figure 3 As shown, Figure 3 This illustration shows a detailed structural diagram of a sub-pixel light-emitting unit 34, one of the photoelectric rechargeable battery unit 10 and the sub-pixel light-emitting unit 34 in the display panel of this application embodiment. The photoelectric rechargeable battery unit 10 includes a first electrode layer 11, a photoelectric conversion layer 13, and a second electrode layer 15 stacked sequentially. The first electrode layer 11 is disposed close to the OLED light-emitting unit 30 and is a light-transmitting electrode layer. The second electrode layer 15 is disposed close to the substrate, and the photoelectric conversion layer is located between the first electrode layer 11 and the second electrode layer 15.

[0040] Optional, see Figure 3 A first electron transport layer 14 can be disposed between the first electrode layer 11 and the photoelectric conversion layer 13, and a first hole transport layer 12 can be disposed between the photoelectric conversion layer 13 and the second electrode layer 15. The first electron transport layer 14 can be made of TiO2 or SnO2 / C60 composite material or other organic or composite materials, and the first hole transport layer 12 can be made of NiO. xInorganic or organic materials such as Spiro-OMeTAD can be used, and the thickness of the first electron transport layer 14 and the first hole transport layer 12 can be designed to be 50~300nm depending on the material selection.

[0041] The first electrode layer 11 can be prepared using transparent conductive oxides such as indium tin oxide (ITO) or fluorine-doped tin oxide (FTO), and the thickness of the first electrode layer 11 is set to 30~90 nm. The light transmittance of the first electrode layer 11 allows light to smoothly enter the photoelectric conversion layer 13, providing a prerequisite for energy conversion.

[0042] The second electrode layer 15 can be set independently, or it can reuse metal traces not covered by the pixel definition layer 60, such as highly reflective Ag or Cu traces.

[0043] The second electrode layer 15 and the first electrode layer 11 work together to form a current transmission circuit, which exports the electrical energy generated by the photoelectric conversion layer 13 and stores it in the energy storage battery or supplies it to the display panel components. The photoelectric conversion layer 13 is a functional layer for energy conversion, which can convert the received light energy into electrical energy to realize the self-charging function of the display panel.

[0044] A transparent insulating layer 20 is disposed between the photoelectric rechargeable battery unit 10 and the sub-pixel light-emitting unit 34. The transparent insulating layer 20 is made of a transparent insulating material, which allows ambient light and / or light emitted by the sub-pixel light-emitting unit 34 to pass through the transparent insulating layer 20 and illuminate the photoelectric rechargeable battery unit 10, so that the photoelectric rechargeable battery unit 10 can generate electricity using light energy. For example, the transparent insulating layer 20 is made of materials such as inorganic silicon nitride, silicon oxide, or transparent organic photoresist, and has a thickness of 50~500nm.

[0045] For example, the transparent insulating layer 20 is prepared by atomic layer deposition (ALD) or chemical vapor deposition (CVD). Compared with the preparation of the transparent insulating layer 20 by chemical vapor deposition (CVD), the preparation of the transparent insulating layer 20 by atomic layer deposition (ALD) can obtain a thinner and denser film layer, achieving a better electrical insulation effect between the transparent anode layer 33 in the upper sub-pixel light-emitting unit 34 and the first electrode layer 11 in the lower photocell unit 10.

[0046] On the one hand, the transparency of the transparent insulating layer 20 can reduce the obstruction to light transmission, allowing the light emitted by the sub-pixel light-emitting unit 34 and ambient light to smoothly enter the photoelectric conversion layer 13; on the other hand, the insulation of the transparent insulating layer 20 can achieve electrical isolation between the photoelectric rechargeable battery unit 10 and the sub-pixel light-emitting unit 34, avoiding electrical signal interference or short circuit between the photoelectric rechargeable battery unit 10 and the sub-pixel light-emitting unit 34, and ensuring the independent and stable operation of the display function and the charging function.

[0047] See Figure 3 Each sub-pixel light-emitting unit 34 includes a semi-transparent cathode layer 31, an organic light-emitting layer 32, and a transparent anode layer 33 stacked sequentially.

[0048] Optionally, a second electron transport layer (not shown in the figure) can be provided between the semi-transparent cathode layer 31 and the organic light-emitting layer 32. The second electron transport layer can receive electrons from the semi-transparent cathode layer 31 and efficiently transport them to the organic light-emitting layer 32, while reducing the reverse recombination of electrons and holes and improving the electron injection efficiency. A second hole transport layer (not shown in the figure) is also provided between the organic light-emitting layer 32 and the transparent anode layer 33. The second hole transport layer is responsible for capturing holes from the transparent anode layer 33 and directionally transporting them to the organic light-emitting layer 32. The hole transport rate can be adjusted so that electrons and holes form a reasonable recombination region in the organic light-emitting layer 32.

[0049] Optionally, the OLED light-emitting unit 30 may further include an electron injection layer and a hole injection layer (not shown in the figure). This embodiment does not specifically limit the layered structure of the OLED light-emitting unit 30. The electron injection layer is located between the semi-transparent cathode layer 31 and the second electron transport layer, and the hole injection layer is located between the transparent anode layer 33 and the second hole transport layer. The electron injection layer can reduce the energy level barrier between the semi-transparent cathode layer 31 and the second electron transport layer, reduce energy loss during the electron injection process, and promote smoother entry of electrons from the semi-transparent cathode layer 31 into the second electron transport layer. The hole injection layer can reduce the contact resistance between the transparent anode layer 33 and the second hole transport layer, adjust the energy level matching degree, and help holes be efficiently injected from the anode to the second hole transport layer.

[0050] Optionally, the semi-transparent cathode layer 31 can be made of silver or magnesium-silver alloy with a thickness of about 10 nm, and the transparent anode layer 33 can be made of transparent conductive oxide ITO. The organic light-emitting layer 32 can emit light for display under the drive of an electrical signal; the transparent anode layer 33 and the semi-transparent cathode layer 31 work together to provide a stable electric field environment for the organic light-emitting layer 32, ensuring that the organic light-emitting layer 32 emits light normally.

[0051] See Figure 4 , Figure 4A in the diagram illustrates an embodiment of this application where ambient light charges the photochargeable battery unit 10. Figure 4 Figure B illustrates a schematic diagram of light emitted by the sub-pixel light-emitting unit 34 of this application entering the photoelectric rechargeable battery unit 10 for charging. The sub-pixel light-emitting unit 34 is designed to be semi-transparent (i.e., light-transmitting) in the vertical direction. This semi-transparent design allows ambient light to penetrate the sub-pixel light-emitting unit 34 and reach the photoelectric rechargeable battery unit 10 below, providing sufficient light source for charging. In addition, some of the light emitted by the sub-pixel light-emitting unit 34 itself can also pass through and be utilized by the photoelectric rechargeable battery unit 10, expanding the source of charging light and further improving the light energy utilization rate.

[0052] The photocell unit 10 and at least one of the multiple sub-pixel light-emitting units 34 have at least a partial overlap area in the vertical projection direction, and the light-transmitting color of the photocell unit 10 is the same as the light-emitting color of the sub-pixel light-emitting unit 34 corresponding to the overlapping area; that is, the photocell unit 10 corresponding to the red sub-pixel light-emitting unit 341 transmits red light, the photocell unit 10 corresponding to the green sub-pixel light-emitting unit 342 transmits green light, and the photocell unit 10 corresponding to the blue sub-pixel light-emitting unit 343 transmits blue light. This design allows the photocell unit 10 to selectively absorb ambient light of other wavelengths different from the light-emitting color of the sub-pixels, allowing only a small amount of ambient light with the same light-emitting color to pass through. Even if this small amount of transmitted ambient light is reflected on the metal lines below, it will be absorbed again by the photocell unit 10, reducing the emission intensity and significantly reducing the total amount of ambient light that forms background noise. In addition, since the light reflected from the metal lines is also the same as the light-emitting color of the sub-pixel light-emitting unit 34, the photocell unit 10 can achieve the effect of "reducing ambient light interference and improving display contrast" similar to a polarizer or COE structure. Therefore, the display panel of this embodiment can eliminate the polarizer or COE structure in conventional designs. In addition, during the process of absorbing ambient light and incident light from the sub-pixel light-emitting unit 34, the photocell unit 10 can convert light energy into electrical energy, achieving a triple benefit (reducing the total amount of ambient light that forms background noise, enabling the photocell unit 10 to achieve a function similar to that of a polarizer or COE structure, and converting light energy into electrical energy).

[0053] In this embodiment, a photoelectric rechargeable battery unit 10, a transparent insulating layer 20, and an OLED light-emitting unit 30 are sequentially stacked on a substrate. The photoelectric rechargeable battery unit 10 and the corresponding sub-pixel light-emitting unit 34 form an overlapping area in the vertical projection direction, and the transmitted light color and the emitted light color are consistent. On the one hand, the photoelectric conversion layer 13 can make full use of ambient light and part of the incident light from the OLED light-emitting unit 30 for photoelectric conversion, adding a self-charging function to the display panel, which helps to alleviate the problem of fast power consumption when using mobile display devices and improves the battery life in outdoor scenarios. On the other hand, the photoelectric rechargeable battery unit 10, which matches the color of the sub-pixel light-emitting unit 34, can absorb ambient light to a certain extent, reducing the background noise formed after the ambient light is reflected on the metal lines of the display device. Therefore, there is no need to set up an additional polarizer or COE structure, which reduces the obstruction of the light emitted by the OLED light-emitting unit 30 and helps to improve the brightness of the display panel. In addition, even if there is a small amount of reflected light due to the metal lines, since the emitted light is the same as the emitted light color of the sub-pixel light-emitting unit 34, the display contrast can be improved.

[0054] See Figure 3 On the side of the OLED light-emitting unit 30 away from the substrate, an encapsulation layer 40 and a transparent protective layer 50 are sequentially stacked. The encapsulation layer 40 includes a first inorganic encapsulation layer 41, an organic encapsulation layer 42, and a second inorganic encapsulation layer 43, which are sequentially stacked. Figure 3 As can be seen, the display panel in this embodiment removes the polarizer or COE structure placed above the encapsulation layer 40.

[0055] Optionally, the first inorganic encapsulation layer 41 can be made of silicon nitride (SiN). x ), silicon dioxide (SiO) x Inorganic insulating materials such as aluminum oxide (Al2O3) can be prepared by atomic layer deposition (ALD) or chemical vapor deposition (CVD). The first inorganic encapsulation layer 41 is attached to the OLED light-emitting unit 30. Utilizing the dense and highly barrier properties of inorganic materials, it effectively prevents harmful external substances such as water vapor and oxygen from penetrating the organic film layers (such as the organic light-emitting layer 32, the second electron transport layer, and the second hole transport layer) of the OLED light-emitting unit 30, reducing the risk of oxidative degradation or hydrolytic failure of organic materials. At the same time, it has good light transmittance, does not affect the light emission of the OLED light-emitting unit 30, and can provide a flat and clean support interface for the subsequent organic encapsulation layer 42, avoiding defects during organic layer coating.

[0056] Optionally, the organic encapsulation layer 42 can be made of transparent organic polymer materials, such as polyimide (PI), epoxy resin, acrylate photoresist, etc., and can be prepared by coating, photolithography or inkjet printing processes. As an intermediate buffer and leveling layer, the organic encapsulation layer 42 can fill the small defects, pinholes or roughness that may exist on the surface of the first inorganic encapsulation layer 41, make up for the shortcomings of inorganic materials that are brittle and prone to cracking, and reduce the path of water vapor / oxygen penetration through defects; on the other hand, the organic encapsulation layer 42 has a certain degree of flexibility, which can alleviate the stress generated by the panel during bending (flexible display scenario) or thermal expansion and contraction, and protect the upper and lower first inorganic encapsulation layers 41 from cracking; in addition, the organic encapsulation layer 42 has high light transmittance, so that light transmission is not affected.

[0057] Optionally, the second inorganic encapsulation layer 43 can be made of a material compatible with the first inorganic encapsulation layer 41, such as silicon nitride, silicon oxide, or titanium dioxide (TiO2), and can also be prepared using ALD or CVD methods. The second inorganic encapsulation layer 43 forms a secondary barrier, constituting an "inorganic-organic-inorganic" composite encapsulation structure together with the first inorganic encapsulation layer 41 and the organic encapsulation layer 42, further improving the barrier efficiency against water vapor and oxygen, and preventing the intrusion of harmful external substances. The second inorganic encapsulation layer 43 can also enhance the overall mechanical strength of the encapsulation layer 40, protecting the internal organic encapsulation layer 42 and the OLED light-emitting unit 30 from external physical damage, and extending the lifespan of the display panel.

[0058] In some embodiments, the second electrode layer 15 of the photocell cell 10 near the substrate has a first reflective interface, which is located on the side of the second electrode layer 15 away from the substrate; the cathode layer of the OLED light-emitting unit 30 near the substrate has a second reflective interface; a microcavity structure is formed between the cathode layer and the corresponding second electrode layer 15.

[0059] For example, the second electrode layer 15 is a metal electrode, and the metal electrode is made of highly reflective Ag or Cu. The side of the metal electrode away from the substrate is a smooth surface, thereby forming a first reflective interface.

[0060] For example, the cathode layer in the OLED light-emitting unit 30 is a semi-transparent cathode layer 31 made of silver or magnesium-silver alloy. The side of the semi-transparent cathode layer 31 near the substrate is a smooth surface, thereby forming a second reflective interface.

[0061] See Figure 5 , Figure 5This illustration shows a schematic diagram of light reflection within a microcavity structure according to an embodiment of this application. The microcavity structure is jointly formed by the second reflective interface of the semi-transparent cathode layer 31 and the first reflective interface of the second electrode layer 15. The microcavity structure allows a portion of the light emitted by the sub-pixel light-emitting unit 34 to propagate back and forth between the two reflective interfaces. Light emitted downwards from the transparent anode layer 33 is reflected by the first reflective interface of the second electrode layer 15, resulting in enhanced interference with the light reflected by the second reflective interface of the semi-transparent cathode layer 31, thus improving the emitted light brightness. Furthermore, since the display panel of this embodiment eliminates the polarizer or COE structure, the brightness of the display panel can be further improved.

[0062] In some embodiments, in the microcavity structure, the distance D between the translucent cathode layer 31 and the corresponding second electrode layer 15 satisfies: D = N*λ / (2*n), where N is a positive integer, λ is the peak wavelength of the sub-pixel light-emitting unit 34, and n is the refractive index of the film layer between the semi-transparent cathode layer 31 and the corresponding second electrode layer 15.

[0063] It is easy to understand that the second electrode layer 15 corresponding to the semi-transparent cathode layer 31 refers to the second electrode layer 15 in the photoelectric rechargeable battery unit 10 corresponding to the semi-transparent cathode layer 31 in the sub-pixel light-emitting unit 34 with overlapping relationship.

[0064] It should be noted that the distances D1 between the translucent cathode layer 31 and the corresponding second electrode layer 15 in the red sub-pixel light-emitting unit 341, D2 between the translucent cathode layer 31 and the corresponding second electrode layer 15 in the green sub-pixel light-emitting unit 342, and D3 between the translucent cathode layer 31 and the corresponding second electrode layer 15 in the blue sub-pixel light-emitting unit 343 are all different.

[0065] The distance D between the semi-transparent cathode layer 31 and the corresponding second electrode layer 15 can be achieved by adjusting the thickness of the transparent insulating layer 20. Specifically, the transparent insulating layer 20 is located between the photoelectric rechargeable battery unit 10 and the OLED light-emitting unit 30, and its thickness can be flexibly adjusted within the range of 50~500nm. This allows the optical length of the microcavity (i.e., the distance D between the semi-transparent cathode layer 31 and the corresponding second electrode layer 15) to be controlled without changing the structure of other functional layers (organic light-emitting layer 32, transparent anode layer 33, first motor layer 11, first hole transport layer 12, photoelectric conversion layer 13, and first electron transport layer 14) between the semi-transparent cathode layer 31 and the corresponding second electrode layer 15.

[0066] Compared to adjusting other films in the microcavity structure, optimizing the distance D by adjusting the thickness of the transparent insulating layer 20 has the following advantages: High process compatibility: The transparent insulating layer 20 can be prepared by atomic layer deposition or chemical vapor deposition, with high thickness control precision, and it is easy to realize the differentiated microcavity design corresponding to different sub-pixel light-emitting units 34.

[0067] Lower cost: There is no need to make complex thickness adjustments or material replacements to the functional layers inside the photocell unit 10 or OLED light-emitting unit 30, avoiding the process complexity and material waste caused by multiple debugging.

[0068] Higher structural stability: The transparent insulating layer 20 itself has good electrical insulation and light transmittance. Adjusting its thickness will not affect the electrical isolation performance between the photoelectric battery unit 10 and the OLED light-emitting unit 30, nor will it interfere with the normal transmission of light.

[0069] Therefore, by adjusting the thickness of the transparent insulating layer 20, this embodiment can not only accurately achieve the resonance conditions of the microcavity structure, but also significantly improve the manufacturing efficiency and yield of the display panel and reduce mass production costs.

[0070] By precisely matching the peak wavelength, film refractive index, and electrode spacing of the sub-pixel light-emitting unit 34, the resonance conditions of the microcavity structure are adapted to the light-emitting characteristics of the sub-pixel light-emitting unit 34. Since different sub-pixel light-emitting units 34 have different peak wavelengths, by combining the corresponding film refractive index and selecting an appropriate positive integer N to determine the distance D, a stable resonance can be formed between the second reflective interface of the cathode layer and the first reflective interface of the second electrode layer 15 for light of a specific wavelength. This filters and enhances the target emission wavelength of the sub-pixel light-emitting unit 34, reduces interference from non-target wavelength light, and further optimizes the effect of the microcavity structure on improving the light-emitting performance.

[0071] For example, when N=3, the peak wavelength of the red sub-pixel light-emitting unit 34 is 620nm, and the average refractive index of the film layer is 1.75, D1 can be estimated to be 531.4nm. When designing the thickness between the cathode layer and the corresponding second electrode layer 15 in the red sub-pixel light-emitting unit 341, D1 can be used as a reference for allocation, thus designing a display and charging integrated device with balanced light emission and charging capabilities. Since N can be selected from different integers, the film thickness design below has more room for adjustment.

[0072] In some embodiments, the photoelectric conversion layer 13 in the photoelectric rechargeable battery unit 10 is made of perovskite material. The photoelectric rechargeable battery unit 10 corresponding to the sub-pixel light-emitting unit 34 with different light emission colors uses different perovskite materials. The perovskite material used in the photoelectric rechargeable battery unit 10 corresponding to any sub-pixel light-emitting unit 34 is used to transmit at least the light emission color of the corresponding sub-pixel light-emitting unit 34.

[0073] Perovskite materials possess excellent photoelectric conversion performance and spectral selectivity. By matching specific perovskite materials to sub-pixel light-emitting units 34 with different emission colors, the light transmission color of the photocell unit 10 can be made consistent with the emission color of the corresponding sub-pixel. Different types of perovskite materials have different band gap widths, corresponding to different spectral absorption and transmission ranges. Selecting a perovskite material that matches the emission color of the sub-pixel as the photoelectric conversion layer 13 can ensure the smooth transmission of the emission light from the corresponding sub-pixel while efficiently absorbing ambient light of other wavelengths and converting it into electrical energy. This satisfies the need to replace polarizers or COE structures to reduce background noise and improves the photoelectric conversion efficiency of the photocell unit 10, achieving a synergistic effect of display and charging functions.

[0074] In some embodiments, see Figure 6 , Figure 6 The diagram shows the structure of different sub-pixel light-emitting units 34 in the OLED light-emitting unit 30 provided in the embodiment of this application, corresponding to the photoelectric rechargeable battery unit 10. The multiple sub-pixel light-emitting units 34 include a red sub-pixel light-emitting unit 341, a green sub-pixel light-emitting unit 342, and a blue sub-pixel light-emitting unit 343.

[0075] The photoelectric conversion layer 13 in the photoelectric rechargeable battery unit 10 corresponding to the red sub-pixel light-emitting unit 341 adopts a perovskite material based on methylammonium lead tribromide (MAPbBr3). This material has a band gap of 2.2eV, which can effectively absorb green and blue light with wavelengths below 564nm, while allowing red light of 620nm to pass through.

[0076] The photoelectric conversion layer 13 in the photoelectric rechargeable battery unit 10 corresponding to the green sub-pixel light-emitting unit 342 is made of Ce3+ doped CsPbBr3 material. The band gap of the Ce3+ doped CsPbBr3 material is 2.4eV, which can absorb blue light with wavelengths below 514nm and transmit green light at 525nm.

[0077] The photoelectric conversion layer 13 in the photoelectric rechargeable battery unit 10 corresponding to the blue sub-pixel light-emitting unit 343 is made of α-phase FAPbI3 (formamidine lead triiodide) material. The band gap of α-phase FAPbI3 material is 1.5eV, which can absorb the entire wavelength of visible light. In order to achieve blue light transmission, the film thickness of the photoelectric conversion layer 13 made of FAPbI3 needs to be designed to be 40~60nm.

[0078] As an example, the red sub-pixel light-emitting unit 341, the green sub-pixel light-emitting unit 342, and the blue sub-pixel light-emitting unit 343 among the multiple sub-pixel light-emitting units 34 all have at least partial overlap with the photoelectric rechargeable battery unit 10 in the vertical projection direction. See also Figure 3In this embodiment, any sub-pixel light-emitting unit 34 is located above the photoelectric rechargeable battery unit 10, and the photoelectric rechargeable battery unit 10 and the sub-pixel light-emitting unit 34 are directly opposite each other, i.e., they completely overlap. In other embodiments, any sub-pixel light-emitting unit 34 may also have a partial overlap with the photoelectric rechargeable battery unit 10 in the vertical projection direction. This embodiment does not limit the percentage of the overlap area between the sub-pixel light-emitting unit 34 and the photoelectric rechargeable battery unit 10.

[0079] In this embodiment, the red sub-pixel light-emitting unit 341, the green sub-pixel light-emitting unit 342, and the blue sub-pixel light-emitting unit 343 all overlap with the photoelectric rechargeable battery unit 10. On the one hand, this allows ambient light to be fully absorbed and converted into electrical energy by the photoelectric rechargeable battery unit 10 corresponding to each sub-pixel, increasing the charging efficiency and battery life of the display panel. On the other hand, each sub-pixel can reduce background noise with the help of the corresponding photoelectric rechargeable battery unit 10. There is no need to set an additional polarizer or COE structure above any sub-pixel light-emitting unit 34, which simplifies the overall structure and ensures that the light emitted from the full-color display area is not blocked by additional means, thus ensuring the consistency of the light-emitting effect of each color sub-pixel.

[0080] As an example, some of the sub-pixel light-emitting units 34 have a photocell battery unit 10 disposed on the side of the sub-pixel light-emitting units 34 near the substrate, while the remaining sub-pixel light-emitting units 34 do not have a photocell battery unit 10 disposed on the side of the sub-pixel light-emitting units 34 near the substrate, and the remaining sub-pixel light-emitting units 34 have a color resist layer 82 disposed on the side of the sub-pixel light-emitting units 34 away from the substrate.

[0081] Optionally, based on the luminous efficiency of the sub-pixel light-emitting unit 34, the photoelectric rechargeable battery unit 10 can be set below those sub-pixel light-emitting units 34 whose luminous efficiency is greater than or equal to a preset luminous efficiency threshold.

[0082] Optionally, since the green sub-pixel light-emitting unit 342 currently has the highest luminous efficiency, the photoelectric rechargeable battery unit 10 can be provided only below the green sub-pixel light-emitting unit 342 with the highest luminous efficiency; and a color resist layer 82 is provided on the side of each red sub-pixel light-emitting unit 341 and blue sub-pixel light-emitting unit 343 away from the substrate to block ambient light.

[0083] Optionally, since the red sub-pixel light-emitting unit 341 currently has the second highest luminous efficiency, a photoelectric rechargeable battery unit 10 can be provided below the green sub-pixel light-emitting unit 342 and the red sub-pixel light-emitting unit 341; and a color resist layer 82 is provided on the side of each blue sub-pixel light-emitting unit 343 away from the substrate to block ambient light.

[0084] By selecting sub-pixel light-emitting units 34 with luminous efficiency greater than or equal to a preset luminous efficiency threshold and placing photoelectric rechargeable battery units 10 below them, a balance between design flexibility, cost control, and performance requirements can be achieved while ensuring the display effect and charging function of the display panel. On the one hand, it adapts to the differentiated requirements of charging capability and display priority in different application scenarios. Sub-pixel light-emitting units 34 with high luminous efficiency have better luminous performance. Even if photoelectric rechargeable battery units 10 are configured, the impact on the display effect can be reduced by the design that "the light transmission color of photoelectric rechargeable battery unit 10 is consistent with the light emission color of sub-pixel light-emitting units 34". In addition, the light emission of sub-pixel light-emitting units 34 with high luminous efficiency can serve as a charging light source to improve photoelectric conversion efficiency, thus eliminating the need to configure photoelectric rechargeable battery units 10 for all pixels. On the other hand, selectively configuring photoelectric rechargeable battery units 10 can reduce the layout range and material usage of photoelectric rechargeable battery units 10, reduce the complexity of structural design, manufacturing process difficulty, and production cost. Sub-pixel light-emitting units 34 without photoelectric rechargeable battery units 10 can compensate for insufficient ambient light blocking by adding a color resist layer 82, so that the overall display contrast is not significantly affected, achieving efficient synergy and optimization of display and charging functions.

[0085] Alternatively, in addition to luminous efficiency, other factors can be considered, or the photoelectric battery unit 10 can be randomly selected to be placed below which sub-pixel light-emitting units 34.

[0086] In some embodiments, see Figure 7 , Figure 7 A schematic diagram of the structure of a display panel provided in another embodiment of this application is shown. A first electrode 71 and a second electrode 72 that are independent of each other are provided on the substrate. The first electrode 71 and the second electrode 72 are separated. The first electrode 71 is electrically connected to the photoelectric rechargeable battery unit 10 and serves as the power output terminal of the photoelectric rechargeable battery unit 10. The second electrode 72 is electrically connected to the sub-pixel light-emitting unit 34 and serves as the anode signal input terminal of the sub-pixel light-emitting unit 34.

[0087] For example, the first electrode 71 and the second electrode 72 can be formed by separating the electrode layers deposited on the substrate, or the first electrode 71 and the second electrode 72 can be two independent electrodes deposited on the substrate.

[0088] Optionally, the substrate in this embodiment is a thin-film transistor (TFT) substrate. The TFT circuit on the TFT substrate drives the pixel switching and signal control of the sub-pixel light-emitting unit 34, and transmits the electrical energy generated by the photoelectric rechargeable battery unit 10.

[0089] In this embodiment, by setting independent first electrodes 71 and second electrodes 72 on the substrate, which are electrically connected to the photoelectric rechargeable battery unit 10 and the sub-pixel light-emitting unit 34 respectively, the circuit for transmitting electrical energy of the photoelectric rechargeable battery unit 10 and the driving circuit of the sub-pixel light-emitting unit 34 form independent signal and energy conduction paths. Thus, the metal traces on the substrate are used as the first electrode 71 and the second electrode 72, realizing the integrated display and charging.

[0090] In some embodiments, see Figure 7 , Figure 8 , Figure 8 This illustration shows a top view of the pixel definition layer 60 with holes punched in it, as provided in an embodiment of this application. The display panel also includes a pixel definition layer 60 located between the substrate and the photoelectric cell unit 10, used to define the pixel region 62 of the sub-pixel light-emitting unit 34. A connection hole 61 is provided on the pixel definition layer 60, with the connection hole 61 facing the second electrode 72 and the pixel region 62 facing the first electrode 71. A transparent insulating layer 20 extends to a position close to the connection hole 61 and covers the photoelectric cell unit 10. The transparent anode layer 33 passes through the connection hole 61 and contacts the second electrode 72. The second electrode layer 15 contacts the first electrode 71, or the second electrode layer 15 reuses the first electrode 71.

[0091] In this embodiment, a hole is drilled in the pixel definition layer 60, with the hole location directly opposite the second electrode 72 on the metal trace layer of the substrate. The transparent anode layer 33 of the sub-pixel light-emitting unit 34 is connected to the second electrode 72 at the connection hole 61 in the pixel definition layer 60. It should be noted that the transparent insulating layer 20 needs to fully cover the photocell unit 10 at the hole location to avoid electrical signal short circuits at the hole.

[0092] The second electrode layer 15 of the photovoltaic rechargeable battery unit 10 can be a separate electrode layer. The second electrode layer 15 contacts the first electrode 71 on the substrate to achieve electrical connection; or, the second electrode layer 15 reuses the first electrode 71 as its own electrode structure. This design achieves electrical connection between the photovoltaic rechargeable battery unit 10 and the first electrode 71 without increasing the number of electrode layers, simplifies the structural layout, and ensures that electrical energy can be successfully discharged.

[0093] In some embodiments, a light-shielding layer 90 is provided at the connection hole 61 to block metallic reflections at the connection hole 61.

[0094] Since the COE structure or polarizer has been removed in this embodiment, the problem of metal reflection at the connection hole 61 needs to be solved. Therefore, this embodiment proposes to cover the connection hole 61 with a light-shielding layer 90.

[0095] Optional, see Figure 9 , Figure 9 The diagram shows a schematic of a light-shielding layer 90 (insulating material) provided at the connection hole 61 according to an embodiment of this application. The light-shielding layer 90 can be a black insulating material.

[0096] By setting up a shielding layer to block ambient light reflected from the metal traces at the perforation, and by using photo-rechargeable battery units 10 in other areas to block ambient light reflected from the metal traces, the display panel can achieve the same or even higher display contrast without using a polarizer or COE structure.

[0097] Optional, see Figure 10 , Figure 10 The diagram shows a schematic of a light-shielding layer 90 (formamidine lead triiodide material) provided at the connection hole 61 according to an embodiment of this application. The light-shielding layer 90 may also be made of formamidine lead triiodide material, and the formamidine lead triiodide material does not contact the semi-transparent cathode layer 31 and the organic light-emitting layer 32.

[0098] For example, see Figure 10 A gap is reserved between the formamidine lead triiodide material and the semi-transparent cathode layer 31 and the organic light-emitting layer 32, and the first inorganic encapsulation layer 41 above the light-shielding layer 90 (the side of the light-shielding layer 90 away from the substrate) is filled between the formamidine lead triiodide material and the semi-transparent cathode layer 31 and the organic light-emitting layer 32.

[0099] Since formamidine lead triiodide is a semiconductor material, if it comes into contact with the translucent cathode layer 31 or the organic light-emitting layer 32, it may cause a short circuit between the transparent anode layer 33 and the translucent cathode layer 31, or affect the normal light emission of the organic light-emitting layer 32. By preventing the formamidine lead triiodide material from contacting the translucent cathode layer 31 and the organic light-emitting layer 32, the phenomenon of short circuit or interference with the normal light emission of the organic light-emitting layer 32 is avoided.

[0100] Example 2: This embodiment provides a display device, which includes a display panel as shown in Embodiment 1.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A display panel, characterized in that, include: A substrate, and a photocell unit, a transparent insulating layer and an OLED light-emitting unit sequentially stacked on the substrate; The first electrode layer of the photoelectric rechargeable battery unit on the side closest to the OLED light-emitting unit is a light-transmitting electrode layer; The OLED light-emitting unit includes multiple sub-pixel light-emitting units, each of which emits a different color. The sub-pixel light-emitting units are designed to be semi-transparent in the vertical direction. The photoelectric rechargeable battery unit and at least one of the plurality of sub-pixel light-emitting units have at least a partial overlap area in the vertical projection direction, and the light-transmitting color of the photoelectric rechargeable battery unit is the same as the light-emitting color of the sub-pixel light-emitting unit with the overlapping area. The photoelectric rechargeable battery unit is used to convert ambient light and / or incident light from the sub-pixel light-emitting unit into electrical energy.

2. The display panel as described in claim 1, characterized in that, The second electrode layer of the photoelectric rechargeable battery unit has a first reflective interface on the side of the second electrode layer away from the substrate; the cathode layer of the OLED light-emitting unit has a second reflective interface on the side of the cathode layer near the substrate. A microcavity structure is formed between the cathode layer and the corresponding second electrode layer.

3. The display panel as described in claim 2, characterized in that, In the microcavity structure, the distance D between the cathode layer and the corresponding second electrode layer satisfies: D = N*λ / (2*n), where N is a positive integer, λ is the peak wavelength of the sub-pixel light-emitting unit, and n is the refractive index of the film layer between the cathode layer and the corresponding second electrode layer.

4. The display panel as described in claim 1, characterized in that, The photoelectric conversion layer in the photoelectric rechargeable battery unit is made of perovskite material. The photoelectric rechargeable battery units corresponding to the sub-pixel light-emitting units with different emission colors use different perovskite materials. The perovskite material used in the photoelectric rechargeable battery unit corresponding to any sub-pixel light-emitting unit is at least used to transmit the emission color of the corresponding sub-pixel light-emitting unit.

5. The display panel as described in claim 4, characterized in that, The plurality of sub-pixel light-emitting units include a red sub-pixel light-emitting unit, a green sub-pixel light-emitting unit, and a blue sub-pixel light-emitting unit; The photoelectric conversion layer in the photoelectric rechargeable battery unit corresponding to the red sub-pixel light-emitting unit is made of methylammonium lead tribromide material, which is used to transmit red light and absorb green and blue light. The photoelectric conversion layer in the photoelectric rechargeable battery unit corresponding to the green sub-pixel light-emitting unit adopts Ce. 3+ Doped CsPbBr3 material, wherein Ce 3+ Doped CsPbBr3 materials are used to transmit green light and absorb blue light; The photoelectric conversion layer in the photoelectric rechargeable battery unit corresponding to the blue sub-pixel light-emitting unit adopts α-phase FAPbI3 material, which is used to transmit blue light and absorb visible light across the entire wavelength range.

6. The display panel as described in claim 1, characterized in that, The transparent insulating layer is made of silicon nitride, silicon oxide, or transparent organic photoresist, and the thickness of the transparent insulating layer is 50~500nm.

7. The display panel as described in claim 1, characterized in that, The transparent insulating layer is prepared by atomic layer deposition.

8. The display panel as described in any one of claims 1-7, characterized in that, The red, green, and blue sub-pixel light-emitting units among the plurality of sub-pixel light-emitting units all have at least partial overlap with the photoelectric rechargeable battery unit in the vertical projection direction.

9. The display panel as described in any one of claims 1-7, characterized in that, In the plurality of sub-pixel light-emitting units, a portion of the sub-pixel light-emitting units have the photoelectric rechargeable battery unit disposed on the side closer to the substrate, while the remaining sub-pixel light-emitting units do not have the photoelectric rechargeable battery unit disposed on the side closer to the substrate, and the remaining sub-pixel light-emitting units have a color resist layer disposed on the side farther from the substrate.

10. The display panel as claimed in claim 9, characterized in that, The sub-pixel light-emitting unit of the aforementioned portion is the sub-pixel light-emitting unit whose luminous efficiency is greater than or equal to a preset luminous efficiency threshold.

11. A display device, characterized in that, The display device includes a display panel as described in any one of claims 1 to 10.

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