Display panel and display device

Abstract

The invention discloses a display panel and a display device. The display panel comprises a light emitting layer and a photoelectric conversion layer, the photoelectric conversion layer comprises a perovskite solar cell, at least part of the perovskite solar cell is located on a light emitting path of the light emitting layer, and the perovskite solar cell is used for converting part of light irradiated on the perovskite solar cell into electric energy. The photoelectric conversion layer can convert a part of incident light into an electric signal to block external ambient light, so that the interference of external strong light on a display picture is reduced, and the display contrast and visibility are improved; the electric energy obtained through conversion can be used for supplying power to a driving circuit or a sensor module in the display panel, self-supply of energy is achieved, and the endurance time of equipment is prolonged.

Description

Technical Field

[0001] This application belongs to the field of display panel technology, and particularly relates to display panels and display devices. Background Technology

[0002] Mobile display devices are typically used outdoors, meaning they cannot usually be directly connected to a power source. Therefore, battery life is a crucial performance parameter for mobile display devices. To improve battery life, current technologies often employ methods such as increasing battery capacity or reducing power consumption, which in turn leads to problems such as increased size and limited brightness. Summary of the Invention

[0003] The purpose of this application is to provide a display panel and display device that aims to solve the battery life problem of mobile display devices.

[0004] A first aspect of this application provides a display panel, comprising: a light-emitting layer; and a photoelectric conversion layer, the photoelectric conversion layer including a perovskite solar cell, the perovskite solar cell being at least partially located on the light emission path of the light-emitting layer, the perovskite solar cell being used to convert a portion of the light illuminating the perovskite solar cell into electrical energy.

[0005] In one embodiment, the perovskite solar cell includes a first electrode layer, a hole transport layer, a perovskite light-absorbing layer, an electron transport layer, and a second electrode layer, which are sequentially stacked along a direction away from the light-emitting layer.

[0006] In one embodiment, the transmittance of the perovskite solar cell is greater than 45%.

[0007] In one embodiment, the display panel further includes a black matrix, and the perovskite solar cell further includes an auxiliary electrode; the black matrix is ​​disposed on the side surface of the photoelectric conversion layer away from the light-emitting layer, and the auxiliary electrode is disposed on the side surface of the first electrode layer near the light-emitting layer and / or the side surface of the second electrode layer away from the light-emitting layer; the orthographic projection of the auxiliary electrode on the light-emitting layer is located within the orthographic projection of the black matrix on the light-emitting layer.

[0008] In one embodiment, the black matrix has a plurality of spaced-apart opening regions, and the orthogonal projections of the hole transport layer and the electron transport layer onto the light-emitting layer are located within the orthogonal projections of the opening regions onto the light-emitting layer.

[0009] In one embodiment, the light-emitting layer includes a substrate, a planarization layer, a pixel definition layer, and a plurality of light-emitting units; the substrate, the planarization layer, and the pixel definition layer are stacked sequentially along a direction close to the photoelectric conversion layer, the pixel definition layer encloses to form a plurality of pixel openings, the light-emitting units correspond one-to-one with the pixel openings, and the light-emitting units are at least partially located within the corresponding pixel openings.

[0010] In one embodiment, the display panel further includes an encapsulation layer and a protective layer; the encapsulation layer is disposed between the light-emitting layer and the photoelectric conversion layer, and the protective layer covers the black matrix and the side of the photoelectric conversion layer away from the light-emitting layer.

[0011] In one embodiment, the encapsulation layer includes a plurality of encapsulation sub-layers stacked sequentially along a direction away from the light-emitting layer, and at least one of the encapsulation sub-layers is made of a flexible material.

[0012] A second aspect of this application provides a display device, including a driving module and a display panel as described above, wherein the driving module is electrically connected to the display panel.

[0013] In one embodiment, the display device further includes an energy storage module, which is electrically connected to the photoelectric conversion layer in the display panel.

[0014] Compared with the prior art, the beneficial effects of this application embodiment are as follows: the perovskite solar cell in the photoelectric conversion layer can convert a portion of the incident light into an electrical signal, thereby blocking external ambient light, reducing the interference of strong external light on the display screen, and improving display contrast and visibility; the converted electrical energy can be used to power the driving circuit or sensor module inside the display panel, achieving self-sufficiency in energy and extending the device's battery life. Attached Figure Description

[0015] Figure 1 A cross-sectional schematic diagram of a display panel provided in an embodiment of this application; Figure 2 This is a schematic cross-sectional view of a perovskite solar cell provided in an embodiment of this application; Figure 3 This is another schematic cross-sectional view of a perovskite solar cell provided in an embodiment of this application; Figure 4 This is another schematic cross-sectional view of a perovskite solar cell provided in an embodiment of this application; Figure 5 This is a schematic diagram of a display device provided in an embodiment of this application.

[0016] Figure Descriptions: 10, Display panel; 20, Display device; 30, Driving module; 40, Energy storage module; 100, Light-emitting layer; 110, Substrate; 120, Planarization layer; 130, Pixel definition layer; 140, Light-emitting unit; 141, Anode; 142, Light-emitting functional layer; 143, Cathode; 200, Photoelectric conversion layer; 210, Perovskite solar cell; 211, First electrode layer; 212, Hole transport layer; 213, Perovskite light-absorbing layer; 214, Electron transport layer; 215, Second electrode layer; 216, Auxiliary electrode; 300, Black matrix; 400, Encapsulation layer; 410, First encapsulation sublayer; 420, Second encapsulation sublayer; 430, Third encapsulation sublayer; 500, Protective layer. Detailed Implementation

[0017] 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.

[0018] 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.

[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 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 this application.

[0020] 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.

[0021] Figure 1 A schematic diagram of a display panel according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and the details are as follows: A display panel 10 includes: an emissive layer 100 and a photoelectric conversion layer 200.

[0022] The light-emitting layer 100 can emit light and display images when a driving signal (including a scan signal and a data signal) is received.

[0023] A photoelectric conversion layer 200 is located on the light-emitting side of the light-emitting layer 100, wherein, for example... Figure 2 As shown, the photoelectric conversion layer 200 includes a perovskite solar cell 210, which is at least partially located in the light-emitting path of the light-emitting layer 100. The perovskite solar cell 210 can be used to convert a portion of the light illuminating the perovskite solar cell 210 into electrical energy.

[0024] On the one hand, the perovskite solar cell 210 can convert a portion of the incident light into electrical signals, blocking ambient light and reducing interference from strong external light on the display image, thus improving display contrast and visibility. On the other hand, the electrical energy converted by the perovskite solar cell 210 can be used to power the drive circuits or sensor modules inside the display panel 10, achieving self-sufficiency in energy and extending the device's battery life. Simultaneously, in low-light or dark environments, the perovskite solar cell 210 can still partially recover and utilize the display light emitted by the light-emitting layer 100, forming an internal light energy circulation mechanism to ensure the normal operation of the display function. When the display panel 10 is applied to wearable devices and mobile terminals, it improves overall energy efficiency and user experience.

[0025] In some embodiments, the converted electrical energy can be collected and used for real-time monitoring of ambient light intensity, providing data support for automatic adjustment of screen brightness and further optimizing energy consumption and visual experience.

[0026] Understandably, perovskite solar cells can achieve efficient absorption and photoelectric conversion of visible light while maintaining high transmittance. By rationally designing the thickness of the perovskite absorption layer within the range of 100nm to 200nm and selecting matching materials, good photoelectric conversion efficiency can be achieved while ensuring sufficient visible light transmittance.

[0027] In one embodiment, such as Figure 2 As shown, the perovskite solar cell 210 includes a first electrode layer 211, a hole transport layer 212, a perovskite light-absorbing layer 213, an electron transport layer 214, and a second electrode layer 215, which are sequentially stacked along the direction away from the light-emitting layer 100.

[0028] The first electrode layer 211 and the second electrode layer 215 are both transparent conductive films, such as ITO, FTO, IZO or Ag transparent single-layer conductive films or ITO / Ag / ITO, ITO / Cu / ITO multilayer conductive films. The thickness of the first electrode layer 211 and the second electrode layer 215 is controlled at 80nm~90nm to balance conductivity and light transmittance.

[0029] Electron transport layer 214 can be made of TiO2, SnO2 / C60 composite material or other organic or inorganic materials, while hole transport layer 212 can be made of NiO. x Materials such as Spiro-OMeTAD are used, and the thickness of each transmission layer is designed between 30nm and 500nm according to the material characteristics. The thickness of the perovskite light-absorbing layer 213 can be controlled between 100nm and 200nm to balance light absorption efficiency and visible light transmittance; in specific designs, it can even be thinned to below 100nm to improve overall transparency.

[0030] The perovskite light-absorbing layer 213, in conjunction with the hole transport layer 212 and the electron transport layer 214, enables highly efficient photoelectric conversion, significantly improving the photoelectric conversion efficiency of the photoelectric conversion layer 200. Simultaneously, this structure is compatible with existing OLED or Micro-LED display processes, achieving functional integration without significantly increasing process complexity. By adjusting the material composition and thickness of the perovskite layer and the transport layer, their response characteristics to different wavelengths of light can be further optimized, enhancing energy harvesting capabilities in low-light environments.

[0031] In one embodiment, the transmittance of the perovskite solar cell is greater than 45%.

[0032] By controlling the material selection and thickness of the perovskite light-absorbing layer 213 and its transmission layer, the overall light transmittance is ensured to be greater than 45%, thereby achieving effective collection of ambient light energy while maintaining the high brightness and color performance of the display device.

[0033] In one embodiment, such as Figure 1 , Figure 3 As shown, the display panel 10 also includes a black matrix 300, and the perovskite solar cell also includes an auxiliary electrode 216.

[0034] The black matrix 300 is disposed on the side surface of the photoelectric conversion layer 200 away from the light-emitting layer 100, and the auxiliary electrode 216 is disposed on the side surface of the first electrode layer 211 close to the light-emitting layer 100 and / or the side surface of the second electrode layer 215 away from the light-emitting layer 100.

[0035] The orthographic projection of the auxiliary electrode 216 onto the light-emitting layer 100 lies within the orthographic projection of the black matrix 300 onto the light-emitting layer 100.

[0036] The black matrix 300, located in the non-light-emitting area, serves to block interference from external incident light and enhance display contrast. The auxiliary electrode 216 compensates for uneven current distribution caused by the high resistivity of the transparent electrode, effectively reducing series resistance and improving the uniformity of photoelectric conversion efficiency, especially in large-size panels. By spatially aligning the auxiliary electrode 216 with the black matrix 300, the design avoids blocking the light-emitting area and affecting display brightness, while fully utilizing the non-light-emitting area to enhance conductivity. This further optimizes the balance between overall light transmittance and power generation performance, achieving high transmittance, low resistance, and process compatibility, thereby improving conductivity without sacrificing the display aperture ratio. In some embodiments, the conductivity of the auxiliary electrode 216 material can be greater than that of the materials of the first electrode layer 211 and the second electrode layer 215. For example, the auxiliary electrode 216 can be made of an opaque material, such as copper.

[0037] In one embodiment, such as Figure 1 , Figure 4 As shown, the black matrix 300 has multiple spaced-apart opening areas.

[0038] The orthographic projections of the hole transport layer 212 and the electron transport layer 214 onto the light-emitting layer 100 lie within the orthographic projection of the opening region onto the light-emitting layer 100.

[0039] It is understandable that by corresponding the hole transport layer 212 and the electron transport layer 214 to the opening regions of the black matrix 300, the amount of material used and the manufacturing cost can be reduced without affecting the effective power generation area of ​​the photoelectric conversion layer 200. At the same time, with the auxiliary electrode 216 provided, the overall thickness of the photoelectric conversion layer 200 can be made more uniform, thereby optimizing the surface flatness of the photoelectric conversion layer 200, which is beneficial to the subsequent deposition of thin film layers and interface contact, further improving the overall photoelectric conversion efficiency and display uniformity of the device.

[0040] In one embodiment, such as Figure 1 As shown, the light-emitting layer 100 includes a substrate 110, a planarization layer 120, a pixel definition layer 130, and a plurality of light-emitting units 140.

[0041] The substrate 110, the planarization layer 120 and the pixel definition layer 130 are stacked sequentially along the direction close to the photoelectric conversion layer 200. The pixel definition layer 130 encloses and forms multiple pixel openings. The light-emitting unit 140 corresponds to each pixel opening, and the light-emitting unit 140 is at least partially located in the corresponding pixel opening.

[0042] The light-emitting unit 140 may include an organic light-emitting diode (OLED). Specifically, each light-emitting unit 140 includes an anode 141, a light-emitting functional layer 142, and a cathode 143. The anode 141 is electrically connected to the planarization layer 120 through an exposed portion of the pixel definition layer 130. The light-emitting functional layer 142 covers the surface of the anode 141. The cathode 143 extends through the non-pixel area to the space between adjacent light-emitting units 140. By sharing the cathode 143, the electrode integration design is achieved, which effectively improves space utilization and reduces circuit complexity while ensuring high resolution.

[0043] It is understood that the light-emitting unit 140 can correspond one-to-one with the opening area of ​​the black matrix 300. The orthographic projection of the light-emitting unit 140 on the planarization layer 120 is located within the orthographic projection of the opening area of ​​the corresponding black matrix 300 on the planarization layer 120, thereby ensuring that the light-emitting area and the light-transmitting area are highly overlapped, further improving the aperture ratio and brightness uniformity of the panel.

[0044] In one embodiment, such as Figure 1 As shown, the display panel 10 also includes an encapsulation layer 400 and a protective layer 500.

[0045] An encapsulation layer 400 is disposed between the light-emitting layer 100 and the photoelectric conversion layer 200, and a protective layer 500 covers the black matrix 300 and the side of the photoelectric conversion layer 200 away from the light-emitting layer 100.

[0046] The encapsulation layer 400 effectively fills the uneven areas on the surface of the light-emitting layer 100, further improving the surface smoothness of the light-emitting layer 100, reducing interface defects, and enhancing the interface bonding quality between the photoelectric conversion layer 200 and the light-emitting layer 100. The protective layer 500 effectively blocks external water and oxygen corrosion, enhancing the device's environmental stability and lifespan. Through multi-layer structure synergistic optimization, a balance between efficient light extraction and charge injection is achieved, significantly improving overall photoelectric performance and ensuring excellent luminous efficiency and uniformity while maintaining high transmittance.

[0047] Specifically, the encapsulation layer 400 may further include a plurality of encapsulation sub-layers stacked sequentially along a direction away from the light-emitting layer 100, such as... Figure 1 As shown, the multiple encapsulation sublayers include a first encapsulation sublayer 410, a second encapsulation sublayer 420, and a third encapsulation sublayer 430. The first encapsulation sublayer 410, the second encapsulation sublayer 420, and the third encapsulation sublayer 430 can be made of different materials according to actual needs.

[0048] In some embodiments, when the display panel 10 is a flexible panel, at least one of the multiple encapsulation sublayers is made of a flexible material. For example, the first encapsulation sublayer 410 and the third encapsulation sublayer 430 may be made of insulating materials (insulating materials include one or more combinations of SiN, SiO, and SiNO) to achieve electrical isolation, and the second encapsulation sublayer 420 may be made of flexible materials (flexible materials include flexible resin materials, flexible plastic materials, etc.).

[0049] In some embodiments, both the planarization layer 120 and the encapsulation layer 400 are made of organic resin materials, and the protective layer 500 can be OG photoresist material or other inorganic dielectric materials with excellent insulation and light transmittance.

[0050] Figure 5 A schematic diagram of a display device according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and the details are as follows: A display device 20 includes a driving module 30 and a display panel 10 as described in any of the above embodiments, wherein the driving module 30 is electrically connected to the display panel 10.

[0051] The display panel 10 includes a light-emitting layer 100 and a photoelectric conversion layer 200.

[0052] The light-emitting layer 100 can be used to emit light and display images when a driving signal is received.

[0053] The photoelectric conversion layer 200 is located on the light-emitting side of the light-emitting layer 100 and is used to filter the light emitted by the light-emitting layer 100 and convert part of the light that shines on the photoelectric conversion layer 200 into electrical energy.

[0054] On the one hand, the photoelectric conversion layer 200 can convert a portion of the incident light into electrical signals, blocking ambient light and reducing interference from strong external light on the display screen, thus improving display contrast and visibility. On the other hand, the converted electrical energy can be used to power the driving circuits or sensor modules inside the display panel 10, achieving self-sufficiency in energy and extending the device's battery life. Simultaneously, in low-light or dark environments, the photoelectric conversion layer 200 can still partially recover and reuse the display light emitted by the light-emitting layer 100, forming an internal light energy circulation mechanism to ensure the normal operation of the display function. When the display panel 10 is applied to wearable devices and mobile terminals, it improves overall energy efficiency and user experience.

[0055] The driving module 30 can be electrically connected to the signal input terminal of the display panel 10 to provide scanning signals and data signals to drive the light-emitting unit 140 in the display panel 10 to light up according to a preset timing sequence to realize image display.

[0056] In one embodiment, the display device 20 further includes an energy storage module 40, which is electrically connected to the photoelectric conversion layer 200 in the display panel 10. The energy storage module 40 can also be connected to the drive module 30 or other power-consuming modules to provide electrical energy.

[0057] The energy storage module 40 can store the electrical energy generated by the photoelectric conversion layer 200 after receiving external light signals, and release energy to assist in power supply when the display panel 10 is working, realizing energy recovery and reuse. The energy storage module 40 can be integrated into the non-visible area of ​​the display device 20 without affecting the overall appearance design. Through the synergistic cooperation of the photoelectric conversion layer 200 and the energy storage module 40, the energy self-sufficiency of the device can be effectively improved in strong light environments, reducing dependence on external power sources, and is especially suitable for low-power continuous display requirements in outdoor high-brightness scenarios.

[0058] For example, in some embodiments, the energy storage module 40 includes a lithium battery.

[0059] From the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0060] It should be understood that the apparatuses and methods disclosed in the several embodiments provided in this application can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of modules or units is only a logical functional division. In actual implementation, there may be other division methods, such as multiple units or components being combined or integrated into another device. In addition, some features may be omitted or not performed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0061] The units described as separate components may or may not be physically separate. A component shown as a unit can be one or more physical units. That is, it can be located in one place or distributed in multiple different locations. Depending on the actual needs, some or all of the units can be selected to achieve the purpose of this solution.

[0062] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit; they can also exist physically separately; or some units can be integrated into one unit while others exist physically separately. The integrated units described above can be implemented in hardware or as software functional units.

[0063] It should be noted that all or part of the above embodiments provided in this application (e.g., part or all of any feature) can be arbitrarily combined or combined with each other.

[0064] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display panel, characterized by, The display panel comprises: a light-emitting layer; a photoelectric conversion layer comprising a perovskite solar cell, the perovskite solar cell being at least partially located on a light-exit path of the light-emitting layer, and the perovskite solar cell being configured to convert part of light rays irradiated on the perovskite solar cell into electric energy.

2. The display panel of claim 1, wherein, The perovskite solar cell comprises, in sequence from a direction away from the light-emitting layer, a first electrode layer, a hole transport layer, a perovskite light-absorbing layer, an electron transport layer, and a second electrode layer.

3. The display panel of claim 1, wherein, The perovskite solar cell has a light transmittance greater than 45%.

4. The display panel of claim 2, wherein, The display panel further comprises a black matrix, and the perovskite solar cell further comprises an auxiliary electrode. The black matrix is disposed on a side surface of the photoelectric conversion layer away from the light-emitting layer, and the auxiliary electrode is disposed on a side surface of the first electrode layer close to the light-emitting layer and / or a side surface of the second electrode layer away from the light-emitting layer. A normal projection of the auxiliary electrode on the light-emitting layer is located within a normal projection of the black matrix on the light-emitting layer.

5. The display panel of claim 4, wherein, The black matrix is provided with a plurality of spaced-apart opening regions, Normal projections of the hole transport layer and the electron transport layer on the light-emitting layer are located within normal projections of the opening regions on the light-emitting layer.

6. The display panel of any one of claims 1 to 5, wherein, The light-emitting layer comprises a substrate, a planarization layer, a pixel definition layer, and a plurality of light-emitting units. The substrate, the planarization layer, and the pixel definition layer are sequentially stacked in a direction close to the photoelectric conversion layer, the pixel definition layer encloses a plurality of pixel openings, the light-emitting units correspond to the pixel openings one by one, and the light-emitting units are at least partially located within the corresponding pixel openings.

7. The display panel of claim 4 or 5, wherein, The display panel further comprises an encapsulation layer and a protective layer. The encapsulation layer is disposed between the light-emitting layer and the photoelectric conversion layer, and the protective layer covers the black matrix and a side surface of the photoelectric conversion layer away from the light-emitting layer.

8. The display panel of claim 7, wherein, The encapsulation layer comprises a plurality of encapsulation sub-layers sequentially stacked in a direction away from the light-emitting layer, and at least one of the encapsulation sub-layers is made of a flexible material.

9. A display device, characterized by comprising: The display device comprises a driving module and the display panel according to any one of claims 1 to 8, and the driving module is electrically connected to the display panel.

10. The display device of claim 9, wherein, The display device further comprises an energy storage module, and the energy storage module is electrically connected to the photoelectric conversion layer in the display panel.

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