A display panel, a preparation method thereof, and a display device

Abstract

Embodiments of the present invention disclose a display panel, a preparation method thereof, and a display device. The display panel includes: a substrate; a light-emitting layer located on one side of the substrate; the light-emitting layer includes a plurality of light-emitting units arranged in an array; the light-emitting units are configured to form a display image on the side where the substrate is located after being driven; a photoelectric conversion layer, the photoelectric conversion layer is located on the side of the light-emitting layer away from the substrate and on the sidewalls of the light-emitting layer; the photoelectric conversion layer is configured to convert the light emitted from the light-emitting layer to the photoelectric conversion layer into electric energy; a packaging layer; the packaging layer is located on the side of the reflective layer away from the substrate. This structure can ensure that while part of the light emitted by the OLED light-emitting material is emitted from the substrate side to form a character pattern, the remaining light propagating to the bottom and side surfaces of the device can be photoelectrically converted by the photoelectrochemical conversion layer to form electric energy, and the electric energy can be supplied to the OLED display panel, thereby avoiding waste of light and improving the light loss problem existing in the display panel.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technologies, and in particular, to a display panel, a preparation method thereof, and a display device. Background Art

[0002] OLED (Organic Light-Emitting Diode) is a self-luminous thin-film device, which has simple preparation process, high brightness, low power consumption, fast response, and high clarity, and can meet the needs of consumers for display technologies.

[0003] When organic semiconductor materials and light-emitting materials in an OLED device are driven by an electric field, light emission is caused by carrier injection and recombination. However, the emitted light is divergent, and only part of the light is emitted from the front of the device to form a pattern, and the rest of the light is emitted from the side and bottom of the device, which will cause unnecessary waste and there is a problem of light loss. Summary of the Invention

[0004] Embodiments of the present invention provide a display panel, a preparation method thereof, and a display device to improve the problem of light loss existing in the display panel.

[0005] In a first aspect, embodiments of the present invention provide a display panel, including:

[0006] A substrate;

[0007] A light-emitting layer located on one side of the substrate; the light-emitting layer includes a plurality of light-emitting units arranged in an array; the light-emitting units are used to form a display screen on the side where the substrate is located after being driven;

[0008] A photoelectric conversion layer, the photoelectric conversion layer is located on the side of the light-emitting layer away from the substrate and the side wall of the light-emitting layer; the photoelectric conversion layer is used to convert the light emitted by the light-emitting layer to the side away from the substrate and the side wall into electric energy;

[0009] A packaging layer, the packaging layer is located on the side of the photoelectric conversion layer away from the substrate.

[0010] Optionally, at least one of the light-emitting units has light transmissivity, and the photoelectric conversion layer is further used to convert the ambient light that sequentially passes through the substrate and the light-emitting unit with light transmissivity into electric energy.

[0011] Optionally, the display panel further includes:

[0012] A reflective layer, the reflective layer is located on the side of the photoelectric conversion layer away from the substrate and the side wall of the photoelectric conversion layer; the reflective layer is used to increase the light output amount of the substrate and the electric energy converted by the photoelectric conversion layer; wherein, the photoelectric conversion layer has light transmissivity.

[0013] Optionally, the photoelectric conversion layer includes a transparent perovskite solar cell, and the photoelectric conversion layer is further configured to supply power to the light-emitting unit.

[0014] Optionally, the transparent perovskite solar cell includes:

[0015] A first electrode layer, which is located on the side of the light-emitting layer away from the substrate and the side walls of the light-emitting layer;

[0016] A first semiconductor layer, which is located on the side of the first electrode layer away from the substrate and the side walls of the first electrode layer;

[0017] A perovskite material layer, which is located on the side of the first semiconductor layer away from the substrate and the side walls of the first semiconductor layer;

[0018] A second semiconductor layer, which is located on the side of the perovskite material layer away from the substrate and the side walls of the perovskite material layer; the doping type of the second semiconductor layer is opposite to that of the first semiconductor layer;

[0019] A second electrode layer, which is located on the side of the second semiconductor layer away from the substrate and the side walls of the second semiconductor layer.

[0020] Optionally, the material of the reflective layer includes a metal material; the second electrode layer and the reflective layer are isolated by an insulating layer.

[0021] Optionally, the material of the reflective layer includes a metal material; the reflective layer is reused as the second electrode layer.

[0022] Optionally, the display panel further includes an energy storage unit; the energy storage unit is configured to store the electric energy generated by the photoelectric conversion layer.

[0023] In a second aspect, an embodiment of the present invention provides a method for manufacturing a display panel, including:

[0024] Providing a substrate;

[0025] Forming a light-emitting layer on one side of the substrate; the light-emitting layer includes a plurality of light-emitting units arranged in an array; after the light-emitting units are driven, a display screen is formed on the side where the substrate is located;

[0026] Forming a photoelectric conversion layer, the photoelectric conversion layer is located on the side of the light-emitting layer away from the substrate and the side walls of the light-emitting layer; the photoelectric conversion layer is configured to convert the light emitted by the light-emitting layer to the side away from the substrate and the side walls into electric energy;

[0027] Forming a packaging layer; the packaging layer is located on the side of the photoelectric conversion layer away from the substrate.

[0028] In a third aspect, an embodiment of the present invention provides a display device, including the display panel described in any of the first aspects.

[0029] An embodiment of the present invention provides a display panel, a preparation method thereof, and a display device. The display panel includes: a substrate; a light-emitting layer located on one side of the substrate; the light-emitting layer includes a plurality of light-emitting units arranged in an array; the light-emitting units are configured to form a display image on the side where the substrate is located after being driven; a photoelectric conversion layer, the photoelectric conversion layer is located on the side of the light-emitting layer away from the substrate and on the sidewalls of the light-emitting layer; the photoelectric conversion layer is configured to convert the light emitted from the light-emitting layer to the photoelectric conversion layer into electric energy; a packaging layer; the packaging layer is located on the side of the reflective layer away from the substrate. The technical solution provided by the embodiment of the present invention sets a photoelectric conversion layer on the side of the light-emitting layer away from the substrate and on the sidewalls of the light-emitting layer, so that the photoelectric conversion layer can convert the light emitted from the light-emitting layer to the side and the bottom surface (the side of the light-emitting layer away from the substrate) into electric energy. While ensuring that part of the light is emitted from the substrate direction to form a character pattern when the OLED light-emitting material emits light, the remaining light can be subjected to photoelectric conversion through the photoelectrochemical conversion layer to form electric energy to supply the OLED display panel to emit light, thereby avoiding waste of light and improving the light loss problem existing in the display panel. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0031] Figure 2 is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0032] Figure 3 is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0033] Figure 4 is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0034] Figure 5 is a flowchart of a method for preparing a display panel provided by an embodiment of the present invention;

[0035] Figure 6 is a flowchart of another method for preparing a display panel provided by an embodiment of the present invention;

[0036] Figure 7 is a schematic structural diagram of a display device provided by an embodiment of the present invention. Detailed Embodiments

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0038] An embodiment of the present invention provides a display panel. Figure 1 It is a schematic structural diagram of a display panel provided by an embodiment of the present invention. Referring to Figure 1 , the display panel includes:

[0039] Substrate 10;

[0040] The light-emitting layer 20 is located on one side of the substrate 10; the light-emitting layer 20 includes a plurality of light-emitting units 21 arranged in an array; the light-emitting units 21 are configured to form a display screen on the side where the substrate 10 is located after being driven.

[0041] The photoelectric conversion layer 30 is located on the side of the light-emitting layer 20 away from the substrate 10 and on the sidewalls of the light-emitting layer 20; the photoelectric conversion layer 30 is configured to convert the light emitted by the light-emitting layer 20 towards the photoelectric conversion layer 30 into electrical energy.

[0042] The encapsulation layer 40 is located on the side of the photoelectric conversion layer 30 away from the substrate 10.

[0043] Specifically, the display panel includes a substrate 10, a light-emitting layer 20, and a photoelectric conversion layer 30. The substrate 10 is a transparent substrate 10, and its material can be glass, so that the light emitted by the light-emitting layer 20 can pass through the substrate 10. The light-emitting layer 20 includes a plurality of light-emitting units 21 arranged in an array. In the light-emitting units 21, the organic semiconductor material and the light-emitting material emit light through carrier injection and recombination under the drive of an electric field. The light emitted by the light-emitting units 21 is divergent, so part of the light can be emitted from one side of the substrate 10 to form a display screen, and part of the light is emitted towards the sidewalls of the light-emitting layer 20 and the side of the light-emitting layer 20 away from the substrate 10.

[0044] By providing a photoelectric conversion layer 30 on the side of the light-emitting layer 20 away from the substrate 10 and on the sidewalls of the light-emitting layer 20, light incident on the sidewalls of the light-emitting layer 20 and on the side of the light-emitting layer 20 away from the substrate 10 can be made to enter the photoelectric conversion layer 30. The photoelectric conversion layer 30 can perform photoelectric conversion on this part of the light to form electric energy. Thus, waste of light is avoided, and the problem of light loss in the display panel is improved. The photoelectric conversion layer 30 can be a flexible solar cell, so as to be provided on the side of the light-emitting layer 20 away from the substrate 10 and on the sidewalls of the light-emitting layer 20. In addition, the converted electric energy can be used to supply power to the light-emitting unit 21, so that the effect of energy reuse can also be achieved. The encapsulation layer 40 is located on the side of the photoelectric conversion layer 30 away from the substrate 10, and the encapsulation layer 40 is used to protect the light-emitting layer 20 and other thin layers from the influence of external moisture, oxygen, etc.

[0045] The display panel provided by the embodiment of the present invention includes: a substrate 10; a light-emitting layer 20 located on one side of the substrate 10; the light-emitting layer 20 includes a plurality of light-emitting units 21 arranged in an array; the light-emitting unit 21 is used to form a display screen on the side where the substrate 10 is located after being driven; a photoelectric conversion layer 30, the photoelectric conversion layer 30 is located on the side of the light-emitting layer 20 away from the substrate 10 and on the sidewalls of the light-emitting layer 20; the photoelectric conversion layer 30 is used to convert the light emitted by the light-emitting layer 20 towards the photoelectric conversion layer 30 into electric energy. By providing the photoelectric conversion layer 30 on the side of the light-emitting layer 20 away from the substrate 10 and on the sidewalls of the light-emitting layer 20, the photoelectric conversion layer 30 can convert the light emitted by the light-emitting layer 20 towards the side and the bottom surface (the side of the light-emitting layer 20 away from the substrate 10) into electric energy. While ensuring that a part of the light emitted by the OLED light-emitting material exits from the direction of the substrate 10 to form a character pattern, the remaining light propagating towards the bottom surface and side of the device can be subjected to photoelectric conversion through the photoelectrochemical conversion layer to form electric energy, which is used to supply light to the OLED display panel, thus avoiding waste of light and improving the problem of light loss in the display panel.

[0046] In an embodiment of the present invention, the display panel further includes a driving layer (not shown), which may be located between the substrate 10 and the light-emitting layer 20, or may be located between the light-emitting layer 20 and the photoelectric conversion layer 30. The driving layer is used to provide a driving signal for the light-emitting layer 20. Among them, in the direction perpendicular to the substrate 10, the light-emitting layer 20 includes an anode layer, a light-emitting material layer, and a cathode layer which are stacked. The anode layer includes a plurality of anodes arranged at intervals, and the anode can be formed of various conductive materials. For example, the anode can be formed as a transparent electrode or a reflective electrode according to its use. The light-emitting material layer is located on the first electrode, and the light-emitting material layer is patterned to correspond to the anode one by one. The light-emitting material layer can be formed of a low-molecular-weight organic material or a high-molecular-weight organic material. The cathode layer can be a whole common electrode layer. Similar to the anode layer, the cathode layer can be formed as a transparent electrode or a reflective electrode. It should be noted that since the electrode layer is thin, the reflective electrode has a certain light transmittance. Each anode, the cathode layer, and the light-emitting material layer located therebetween form a light-emitting unit 21. Among them, the anode layer is electrically connected to the driving layer. When a certain voltage is applied to the anode layer and the cathode layer, electrons are injected into the cathode, and holes are formed at the anode. The electrons and holes will meet and combine in the light-emitting material layer, and the energy is released in the form of photons. In addition, the light-emitting layer 20 may further include at least one functional layer such as a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL).

[0047] In an embodiment of the present invention, at least one light-emitting unit 21 has light transmittance, and the photoelectric conversion layer 30 is further used to convert the ambient light that sequentially passes through the substrate 10 and the light-emitting unit 21 with light transmittance into electric energy.

[0048] It can be understood that among the multiple light-emitting units 21 arranged in an array, at least one light-emitting unit 21 is a transparent light-emitting unit 21. The light emitted by the light-emitting unit to the photoelectric conversion layer 30 can be increased, thereby improving the electric energy converted by the photoelectric conversion layer 30. In addition, the ambient light can sequentially pass through the substrate 10 and the transparent light-emitting unit 21 and enter the photoelectric conversion layer 30, and the photoelectric conversion layer 30 can also convert the ambient light into electric energy, thereby increasing the conversion amount of the electric energy of the photoelectric conversion layer 30. The anode and cathode of the light-emitting unit 21 can both be transparent electrodes. The materials of the transparent electrodes can include indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), etc.

[0049] In another embodiment of the present invention, all the light-emitting units 21 are light-transmissive. The photoelectric conversion layer 30 can further convert the ambient light that sequentially passes through the entire substrate 10 and the light-emitting layer 20 into electrical energy, further increasing the amount of electrical energy converted by the photoelectric conversion layer 30. At this time, the entire anode layer and the entire cathode layer are both transparent electrode layers. The materials of the transparent electrode layer can include indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), etc.

[0050] In one embodiment of the present invention, referring to Figure 2 , the display panel further includes: a reflective layer 50, which is located on the side of the photoelectric conversion layer 30 away from the substrate 10 and on the sidewalls of the photoelectric conversion layer 30; the reflective layer 50 is used to increase the light output of the substrate 10 and the electrical energy converted by the photoelectric conversion layer 30; wherein, the photoelectric conversion layer 30 has light-transmittance.

[0051] It can be understood that the photoelectric conversion layer 30 has a certain light-transmittance. Therefore, when the light emitted by the light-emitting unit 21 and the ambient light are incident on the photoelectric conversion layer 30 for photoelectric conversion to form electrical energy, part of the light will still pass through the photoelectric conversion layer 30, resulting in waste. By forming the reflective layer 50 on the side of the photoelectric conversion layer 30 away from the substrate 10 and on the sidewalls of the photoelectric conversion layer 30, the light passing through the photoelectric conversion layer 30 can be reflected back to the photoelectric conversion layer 30 for re-photoelectric conversion, further avoiding light waste and improving the light loss problem existing in the display panel. Moreover, the reflected light can pass through the photoelectric conversion layer 30 again and be emitted from the substrate 10, thereby increasing the light output of the substrate 10 and improving the brightness of the display panel. In addition, by providing the reflective layer 50, the requirement for the transparency of the photoelectric conversion layer 30 can be reduced, and the selection range of the photoelectric conversion layer 30 can be expanded.

[0052] In one embodiment of the present invention, referring to Figure 3 , the photoelectric conversion layer 30 includes a transparent perovskite solar cell.

[0053] It can be understood that perovskite solar cells belong to compound semiconductor solar cells and are one type of high-efficiency solar cells. Among them, the transparent perovskite solar cell includes: a first electrode layer 31, which is located on the side of the light-emitting layer 20 away from the substrate 10 and on the sidewalls of the light-emitting layer 20; a first semiconductor layer 32, which is located on the side of the first electrode layer 31 away from the substrate 10 and on the sidewalls of the first electrode layer 31; a perovskite material layer 33, which is located on the side of the first semiconductor layer 32 away from the substrate 10 and on the sidewalls of the first semiconductor layer 32; a second semiconductor layer 34, which is located on the side of the perovskite material layer 33 away from the substrate 10 and on the sidewalls of the perovskite material layer 33; the doping type of the second semiconductor layer 34 is opposite to that of the first semiconductor layer 32 (one is n-type and the other is p-type); a second electrode layer 35, which is located on the side of the second semiconductor layer 34 away from the substrate 10 and on the sidewalls of the second semiconductor layer 34.

[0054] The perovskite material has a large dielectric constant and a low excitation energy. The perovskite material layer 33 can absorb photons to generate electron-hole pairs and dissociate at room temperature. When receiving light irradiation, the perovskite material layer 33 first absorbs photons to generate electron-hole pairs. Due to the difference in the exciton binding energy of the perovskite material, these carriers either become free carriers or form excitons. The excitons are first separated into electrons and holes and transported to the transparent electrode layers on both sides respectively. The photo-generated holes flow to the p region, and the photo-generated electrons flow to the n region, and a current is formed when the circuit is connected.

[0055] In an embodiment of the present invention, referring to Figure 3 , the material of the reflective layer 50 includes a metal material. For example, the material of the reflective layer 50 can be Al, and the second electrode layer and the reflective layer 50 are isolated by a second insulating layer 62. Moreover, the light-emitting layer 20 and the photoelectric conversion layer 30 are isolated by a first insulating layer 61.

[0056] In another embodiment of the present invention, referring to Figure 4 , the reflective layer 50 is reused as the second electrode layer 35.

[0057] It can be understood that the material of the second electrode layer 35 can also be used as the reflective layer 50 while serving as an electrode layer. For example, the material of the second electrode layer 35 can be Al. Reusing the reflective layer 50 as the second electrode layer 35 can, while having the functions of reflection and conduction, reduce the number of film layers of the display panel, the thickness of the display panel, and the cost compared with the setting method in which the second electrode layer and the reflective layer 50 are isolated by an insulating layer.

[0058] In an embodiment of the present invention, the display panel further includes an energy storage unit (not shown); the energy storage unit is used to store the electric energy generated by the photoelectric conversion layer 30.

[0059] It can be understood that the electric energy converted by the photoelectric conversion layer 30 is used to supply power to the light-emitting layer 20. The electric energy converted by the photoelectric conversion layer 30 can be stored in a storage battery first and then supplied to the light-emitting layer 20 through the storage battery; or the electric energy converted by the photoelectric conversion layer 30 can be directly input into the circuit for supplying power to the light-emitting layer 20. The energy storage unit can be, for example, a flexible lithium-ion battery.

[0060] In summary, the display panel provided by the embodiment of the present invention is provided with a photoelectric conversion layer on the side of the light-emitting layer away from the substrate and on the side wall of the light-emitting layer, so that the photoelectric conversion layer can convert the light emitted by the light-emitting layer to the side and the bottom surface (the side of the light-emitting layer away from the substrate) into electric energy. While ensuring that part of the light is emitted from the substrate direction to form a character pattern when the OLED light-emitting material emits light, the remaining light propagating to the bottom surface and side surface of the device can be photoelectrically converted by the photoelectrochemical conversion layer to form electric energy to supply the OLED display panel to emit light, thereby avoiding waste of light and improving the light loss problem existing in the display panel. In addition, by additionally plating a reflective layer, the reflected light passes through the perovskite solar cell again, and part of the remaining light is photoelectrically converted again; part of the light passing through the solar cell passes through the device and is emitted from the substrate to improve the display brightness of the device.

[0061] The embodiment of the present invention also provides a preparation method of a display panel for forming the display panel described in any of the above embodiments. Figure 5 It is a flowchart of a preparation method of a display panel provided by the embodiment of the present invention. Refer to Figure 5 , the preparation method of the display panel includes:

[0062] S110. Provide a substrate.

[0063] Specifically, the substrate is a transparent substrate, and its material can be glass. The light emitted by the light-emitting layer can pass through the substrate, so that a display picture can be formed on one side of the substrate.

[0064] S120. Form a light-emitting layer on one side of the substrate; the light-emitting layer includes a plurality of light-emitting units arranged in an array; after being driven, the light-emitting units form a display picture on the side where the substrate is located.

[0065] Specifically, the light-emitting layer includes a plurality of light-emitting units arranged in an array. The organic semiconductor material and the light-emitting material in the light-emitting units emit light through carrier injection and recombination under the drive of an electric field. In the direction perpendicular to the substrate, the light-emitting layer includes an anode layer, a light-emitting material layer, and a cathode layer stacked. Forming the light-emitting layer may include: sequentially forming an anode layer, a light-emitting material layer, and a cathode layer on one side of the substrate.

[0066] The anode layer includes a plurality of anodes arranged at intervals, and the anodes can be formed of various conductive materials. For example, the anode is a transparent electrode. The materials can include indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), etc. The light-emitting material layer is located on the anode layer, and the light-emitting material layer is patterned to correspond to the anodes one by one. The light-emitting material layer can be formed of low-molecular-weight organic materials or high-molecular-weight organic materials. The cathode layer can be a single-layer common electrode layer. Similar to the anode layer, the cathode layer can be formed as a transparent electrode. Each anode, the cathode layer, and the light-emitting material layer located therebetween form a light-emitting unit. Among them, the anode layer is electrically connected to the driving layer. When a certain voltage is applied to the anode layer and the cathode layer, electrons are injected into the cathode, and holes are formed at the anode. The electrons and holes will meet and combine in the light-emitting material layer, releasing energy in the form of photons. In addition, the light-emitting layer can also include at least one functional layer such as a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL).

[0067] S130. Form a photoelectric conversion layer, which is located on the side of the light-emitting layer away from the substrate and on the sidewalls of the light-emitting layer; the photoelectric conversion layer is used to convert the light emitted by the light-emitting layer towards the photoelectric conversion layer into electrical energy.

[0068] Specifically, the light emitted by the light-emitting unit is divergent. Therefore, part of the light can be emitted from one side of the display panel substrate to form a display screen, and part of the light is emitted towards the sidewalls of the light-emitting layer and the side of the light-emitting layer away from the substrate. By providing a photoelectric conversion layer on the side of the light-emitting layer away from the substrate and on the sidewalls of the light-emitting layer, the light emitted towards the sidewalls of the light-emitting layer and the side of the light-emitting layer away from the substrate can be incident on the light-emitting conversion layer. The photoelectric conversion layer can perform photoelectric conversion on this part of the light to form electrical energy. Thus, the waste of light is avoided, and the problem of light loss in the display panel is improved. The photoelectric conversion layer can be a flexible solar cell, so as to be provided on the side of the light-emitting layer away from the substrate and on the sidewalls of the light-emitting layer. In addition, the converted electrical energy can be used to supply power to the light-emitting unit, so as to achieve the effect of energy reuse.

[0069] In an embodiment of the present invention, at least one light-emitting unit has light transmissivity, and the photoelectric conversion layer is further used to convert the ambient light that sequentially passes through the substrate and the light-emitting unit with light transmissivity into electrical energy, thereby improving the conversion amount of electrical energy of the photoelectric conversion layer.

[0070] S140. Form a packaging layer, which is located on the side of the photoelectric conversion layer away from the substrate.

[0071] Specifically, the packaging layer is located on the side of the photoelectric conversion layer away from the substrate, and the packaging layer is used to protect the light-emitting layer and other thin layers from the influence of external moisture, oxygen, etc.

[0072] The manufacturing method of the display panel provided by the embodiment of the present invention forms a photoelectric conversion layer on the side of the light-emitting layer away from the substrate and on the side walls of the light-emitting layer, so that the photoelectric conversion layer can convert the light emitted by the light-emitting layer to the side and the bottom surface (the side of the light-emitting layer away from the substrate) into electrical energy. When the OLED light-emitting material emits light, while part of the light is emitted from the substrate direction to form a character pattern, the remaining light propagating to the bottom and side surfaces of the device can be photoelectrically converted by the photoelectrochemical conversion layer to form electrical energy, which is used to supply the OLED display panel to emit light, thereby avoiding waste of light and improving the light loss problem existing in the display panel.

[0073] Figure 6 is a flowchart of a manufacturing method of a display panel provided by an embodiment of the present invention. Refer to Figure 6 , the manufacturing method of the display panel includes:

[0074] S210. Provide a substrate.

[0075] S220. Form a light-emitting layer on one side of the substrate; the light-emitting layer includes a plurality of light-emitting units arranged in an array; after the light-emitting units are driven, a display screen is formed on the side where the substrate is located.

[0076] S230. Form a photoelectric conversion layer, the photoelectric conversion layer is located on the side of the light-emitting layer away from the substrate and on the side walls of the light-emitting layer; the photoelectric conversion layer is used to convert the light emitted by the light-emitting layer to the photoelectric conversion layer into electrical energy; wherein, the photoelectric conversion layer has light transmittance.

[0077] Specifically, the photoelectric conversion layer includes a transparent perovskite solar cell. Forming the photoelectric conversion layer includes: sequentially forming a first electrode layer, a first semiconductor layer, a perovskite material layer, a second semiconductor layer, and a second electrode layer on the side of the light-emitting layer away from the substrate and on the side walls. The doping type of the second semiconductor layer is opposite to that of the first semiconductor layer (one is n-type and the other is p-type). The perovskite material has a large dielectric constant and a low excitation energy. The perovskite material layer can generate electron-hole pairs by absorbing photons and dissociate at room temperature. The dissociated electrons migrate to the conduction band of the electron transport layer material, and the holes migrate to the valence band of the hole transport layer material. The electrons and holes are collected through the transparent conductive electrodes on both sides of the battery respectively, and a current is generated. In addition, forming the photoelectric conversion layer further includes forming an insulating layer on the side of the light-emitting layer away from the substrate and on the side walls to insulate the light-emitting layer and the photoelectric conversion layer.

[0078] S240. Form a reflective layer, the reflective layer is located on the side of the photoelectric conversion layer away from the substrate and on the side walls of the photoelectric conversion layer; the reflective layer is used to increase the light output of the substrate and the electrical energy converted by the photoelectric conversion layer.

[0079] Specifically, the optoelectronic conversion layer has a certain light transmittance. Therefore, when the light emitted by the light-emitting unit and the ambient light are incident on the optoelectronic conversion layer for optoelectronic conversion to form electric energy, a part of the light will still pass through the optoelectronic conversion layer, resulting in waste. By forming a reflective layer on the side of the optoelectronic conversion layer away from the substrate and on the sidewalls of the optoelectronic conversion layer, the light passing through the optoelectronic conversion layer can be reflected back to the optoelectronic conversion layer for re-optoelectronic conversion, further avoiding light waste and improving the light loss problem existing in the display panel. Moreover, the reflected light can pass through the optoelectronic conversion layer again and be emitted from the substrate, thereby increasing the light output of the substrate and improving the brightness of the display panel. In addition, by setting the reflective layer, the requirement for the transparency of the optoelectronic conversion layer can be reduced, and the selection range of the optoelectronic conversion layer can be expanded.

[0080] S250. Form a packaging layer; the packaging layer is located on the side of the reflective layer away from the substrate.

[0081] In the manufacturing method of the display panel provided by the embodiment of the present invention, by disposing an optoelectronic conversion layer on the side of the light-emitting layer away from the substrate and on the sidewalls of the light-emitting layer, the optoelectronic conversion layer can convert the light emitted by the light-emitting layer to the side and the bottom surface (the side of the light-emitting layer away from the substrate) into electric energy. While ensuring that a part of the light is emitted from the substrate direction to form a character pattern when the OLED light-emitting material emits light, the remaining light propagating to the bottom surface and side surfaces of the device can be optoelectronically converted by the optoelectrochemical conversion layer to form electric energy to supply the OLED display panel to emit light, thereby avoiding light waste and improving the light loss problem existing in the display panel. In addition, by additionally depositing a reflective layer, the reflected light passes through the perovskite solar cell again, and a part of the remaining light is optoelectronically converted again; a part of the light passing through the solar cell passes through the device and is emitted from the substrate to improve the display brightness of the device.

[0082] The embodiment of the present invention also provides a display device. Figure 7 is a schematic structural diagram of a display device provided by the embodiment of the present invention. Refer to Figure 7 , the display device includes the display panel 1 in any of the above embodiments. It has the same technical effects and will not be elaborated here.

[0083] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, it includes: a substrate; a light-emitting layer located on one side of the substrate; the light-emitting layer includes a plurality of light-emitting units arranged in an array; the light-emitting units are used to form a display screen on the side where the substrate is located after being driven; a photoelectric conversion layer, the photoelectric conversion layer is located on the side of the light-emitting layer away from the substrate and the side walls of the light-emitting layer; the photoelectric conversion layer is used to convert the light emitted by the light-emitting layer to the side away from the substrate and the side walls into electric energy; a packaging layer, the packaging layer is located on the side of the photoelectric conversion layer away from the substrate; a reflective layer, the reflective layer is located on the side of the photoelectric conversion layer away from the substrate and the side walls of the photoelectric conversion layer; the reflective layer is used to increase the light output of the substrate and the electric energy converted by the photoelectric conversion layer; wherein, the photoelectric conversion layer has light transmittance; relative to the packaging layer, the reflective layer is closer to the substrate.

2. The display panel according to claim 1, characterized in that, at least one of the light-emitting units has light transmittance, and the photoelectric conversion layer is further used to convert the ambient light that sequentially passes through the substrate and the light-emitting unit with light transmittance into electric energy.

3. The display panel according to claim 1, characterized in that, the photoelectric conversion layer includes a transparent perovskite solar cell, and the photoelectric conversion layer is further used to supply power to the light-emitting units.

4. The display panel according to claim 3, characterized in that, the transparent perovskite solar cell includes: a first electrode layer, the first electrode layer is located on the side of the light-emitting layer away from the substrate and the side walls of the light-emitting layer; a first semiconductor layer, the first semiconductor layer is located on the side of the first electrode layer away from the substrate and the side walls of the first electrode layer; a perovskite material layer, the perovskite material layer is located on the side of the first semiconductor layer away from the substrate and the side walls of the first semiconductor layer; a second semiconductor layer, the second semiconductor layer is located on the side of the perovskite material layer away from the substrate and the side walls of the perovskite material layer; the doping type of the second semiconductor layer is opposite to that of the first semiconductor layer; a second electrode layer, the second electrode layer is located on the side of the second semiconductor layer away from the substrate and the side walls of the second semiconductor layer.

5. The display panel according to claim 4, characterized in that, the material of the reflective layer includes a metal material; the second electrode layer and the reflective layer are isolated by an insulating layer.

6. The display panel according to claim 4, characterized in that, the material of the reflective layer includes a metal material; the reflective layer is reused as the second electrode layer.

7. The display panel according to claim 1, characterized in that, it further includes an energy storage unit; the energy storage unit is used to store the electric energy generated by the photoelectric conversion layer.

8. A method for manufacturing a display panel, characterized in that, for manufacturing the display panel according to any one of claims 1-7, it includes: providing a substrate; A light-emitting layer is formed on one side of the substrate; the light-emitting layer includes a plurality of light-emitting units arranged in an array; after being driven, the light-emitting units form a display screen on the side where the substrate is located. A photoelectric conversion layer is formed, and the photoelectric conversion layer is located on the side of the light-emitting layer away from the substrate and on the sidewalls of the light-emitting layer; the photoelectric conversion layer is used to convert the light emitted by the light-emitting layer to the side away from the substrate and the sidewalls into electrical energy. A packaging layer is formed; the packaging layer is located on the side of the photoelectric conversion layer away from the substrate.

9. A display device characterized in that it includes the display panel according to any one of claims 1-7.

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