Display device

Abstract

The invention discloses a display device which comprises a display screen, an energy storage unit, an energy management unit and a self-starting unit. The display screen comprises a transparent photovoltaic layer and a display layer which are stacked, and miniaturization of display equipment is facilitated. The energy management unit comprises an energy transmission circuit and an energy control unit, the energy transmission circuit is connected between the transparent photovoltaic layer and the energy storage unit, the energy storage unit is connected with the energy control unit and the display layer, and the energy control unit is used for controlling on-off of the energy transmission circuit. The self-starting unit is used for amplifying a first voltage of electric energy generated by the transparent photovoltaic layer into a second voltage when the display equipment is started and the voltage of the energy storage unit is lower than the working voltage of the energy control unit, and providing the second voltage to the energy control unit, so that the energy control unit works; furthermore, the energy generated by the transparent photovoltaic layer is controlled to be transmitted to the energy storage unit, so that the display equipment can be started without depending on an external power supply under a weak illumination condition.

Description

Technical Field

[0001] This application belongs to the technical field of passive Internet of Things, and particularly relates to a display device. Background Art

[0002] The passive Internet of Things technology based on photovoltaic energy harvesting, as an important way to achieve self-power supply, intelligence, and sustainable development of Internet of Things devices, is evolving towards higher energy conversion efficiency, low-power system integration, and extensive practical applications, and is gradually becoming the key to energy self-sufficiency, low cost, and environmental friendliness of Internet of Things devices. Using solar energy as the main energy source, the photovoltaic energy harvesting technology can provide long-term power supply for Internet of Things nodes, and is particularly suitable for scenarios without power supply and difficult to maintain. In the fields of smart home, industry, agriculture, etc., the photovoltaic energy harvesting technology has realized maintenance-free monitoring and communication, and promoted the rapid development of display devices with display functions.

[0003] In related technologies, display devices with photovoltaic energy harvesting and display functions are large in volume and weight, and cannot achieve energy self-sufficiency during operation. A power supply system needs to be arranged, which limits their application capabilities in terms of multifunctionality and wide adaptability. Summary of the Invention

[0004] This application provides a display device to solve at least some of the problems in related technologies.

[0005] The display device provided by this application includes:

[0006] A display screen, including a transparent photovoltaic layer and a display layer, where the transparent photovoltaic layer and the display layer are stacked;

[0007] An energy storage unit;

[0008] An energy management unit, including an energy transmission circuit and an energy control unit. The energy transmission circuit is connected between the transparent photovoltaic layer and the energy storage unit for transmitting the electric energy generated by the transparent photovoltaic layer to the energy storage unit. The energy storage unit is connected to the energy control unit and the display layer for supplying power to the energy control unit and the display layer. The energy control unit is connected to the energy transmission circuit for controlling the on-off of the energy transmission circuit;

[0009] A self-starting unit, connected between the transparent photovoltaic layer and the energy control unit, for amplifying the first voltage of the electric energy generated by the transparent photovoltaic layer to a second voltage and supplying it to the energy control unit when the voltage of the energy storage unit is lower than the working voltage of the energy control unit when the display device starts. Among them, the first voltage is less than the working voltage of the energy control unit, and the second voltage is not less than the working voltage of the energy control unit.

[0010] Optionally, the self-starting unit includes a low-voltage oscillator and a boost charge pump. The low-voltage oscillator is connected between the transparent photovoltaic layer and the boost charge pump, and the boost charge pump is connected between the transparent photovoltaic layer and the energy control unit. The boost charge pump includes a plurality of first capacitors and a plurality of switching tubes connected in cascade. The low-voltage oscillator is connected to the plurality of switching tubes and is used to generate control pulses to control the on / off of the plurality of switching tubes, so that the plurality of first capacitors are in parallel during the charging stage and in series during the discharging stage, and the first voltage of the electric energy generated by the transparent photovoltaic layer is amplified to the second voltage.

[0011] Optionally, the energy transmission circuit includes an input sampling unit and a power regulation unit. The input sampling unit includes a second capacitor and a ground terminal. The power regulation unit includes a first switch. The second capacitor is connected between the transparent photovoltaic layer and the ground terminal, and the first switch is connected between the second capacitor and the energy storage unit. The energy control unit is connected to the first switch and is used to control the on / off of the first switch to regulate the power of the energy transmission circuit.

[0012] Optionally, the energy transmission circuit further includes a voltage regulation unit connected between the first switch and the energy storage unit. The voltage regulation unit includes an inductor, a second switch, a third switch, and a fourth switch. The inductor is connected between the first switch and the fourth switch, the fourth switch is connected between the inductor and the energy storage unit, the second switch is connected between one end of the inductor and the ground terminal, and the third switch is connected between the other end of the inductor and the ground terminal. The energy control unit is connected to the second switch, the third switch, and the fourth switch and is used to control the on / off of the second switch, the third switch, and the fourth switch to regulate the voltage output by the power regulation unit.

[0013] Optionally, the display device further includes a load and a power supply node. The energy storage unit is connected to the load and the energy control unit through the power supply node, and the energy transmission circuit is connected to the energy storage unit, the load, and the energy control unit through the power supply node.

[0014] Optionally, the input sampling unit is configured to collect the input power generated by the transparent photovoltaic layer, and the energy storage unit is provided with a power quantity collection unit for collecting the power quantity of the energy storage unit; a first power supply switch is connected between the power supply node and the energy control unit, and a second power supply switch is connected between the power supply node and the load. The display device includes a power supply switch control unit, which is connected to the input sampling unit and the power quantity collection unit, and is also connected to the first power supply switch and the second power supply switch. The power supply switch control unit is configured to:

[0015] When the input power is less than a first power limit value and the power quantity is less than a first power quantity limit value, control the first power supply switch to turn on and the second power supply switch to turn on; and / or

[0016] When the input power is greater than the first power limit value and less than a second power limit value, and the power quantity is greater than the first power quantity limit value, in the state where the fourth switch is turned on, control the first power supply switch and the second power supply switch to turn off; in the state where the fourth switch is turned off, control the first power supply switch and the second power supply switch to turn on; and / or

[0017] When the input power is greater than the second power limit value and the power quantity is greater than the first power quantity limit value, in the state where the fourth switch is turned on, control the first power supply switch and the second power supply switch to turn on; in the state where the fourth switch is turned off, control the first power supply switch and the second power supply switch to turn off.

[0018] Optionally, the power supply switch control unit is independently provided from the energy control unit. The power supply switch control unit is configured to: when the input power is less than the first power limit value and the power quantity is greater than the first power quantity limit value, control the first power supply switch to turn off and the second power supply switch to turn on.

[0019] Optionally, the power supply switch control unit is independently provided or integrated into the energy control unit.

[0020] Optionally, a sensor and an information processing unit are further included. The information processing unit is connected between the sensor and the display screen, and is configured to process the information collected by the sensor and display the processed information on the display screen. The energy storage unit is connected to the sensor for supplying power to the sensor; and / or

[0021] A Bluetooth unit is further included. The Bluetooth unit is connected to the information processing unit, and the energy storage unit is connected to the Bluetooth unit for supplying power to the Bluetooth unit.

[0022] Optionally, the transparent photovoltaic layer and the display layer overlap completely or partially; and / or

[0023] The display screen further includes a transparent cover plate, and the transparent cover plate covers the transparent photovoltaic layer.

[0024] For the display device provided in this application, by making the display screen include a transparent photovoltaic layer and a display layer, and laminating the transparent photovoltaic layer and the display layer, the display screen can not only be used for display but also for energy collection, facilitating the miniaturization of the display device. By making the display device include an energy storage unit, an energy management unit, and a self-starting unit, and making the energy management unit include an energy transmission circuit and an energy control unit, when the display device is started, in the case where the voltage of the energy storage unit is not sufficient to make the energy control unit work and the energy of the transparent photovoltaic layer is not sufficient to make the energy control unit work, the self-starting unit can amplify the first voltage generated by the transparent photovoltaic layer to a second voltage to supply power to the energy control unit, making the energy control unit work, and then controlling the energy generated by the transparent photovoltaic layer to be transmitted to the energy storage unit, so that the display device can be started without relying on an external power supply under weak light conditions. Description of the Drawings

[0025] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0026] Figure 1 It is a structural block diagram of the display device provided by the embodiment of this application;

[0027] Figure 2 It is a principle block diagram of the display device provided by the embodiment of this application;

[0028] Figure 3 It is a principle block diagram of the self-starting unit provided by the embodiment of this application;

[0029] Figure 4 is Figure 3 the circuit diagram of the boost charge pump shown;

[0030] Figure 5 is Figure 4 the schematic diagram of the working principle of the boost charge pump shown;

[0031] Figure 6 It is the circuit diagram of the display device provided by the embodiment of this application;

[0032] Figure 7 is Figure 6 the schematic diagram of the working principle of the display device shown;

[0033] Figure 8 is Figure 6 the schematic diagram of the energy supply mode of the display device shown;

[0034] Figure 9 Schematic structural diagram of a display device provided in another embodiment of the present application.

[0035] Reference numerals:

[0036] Display device 1, display screen 10, transparent photovoltaic layer 11, display layer 12, transparent cover plate 13, frame 14, energy storage unit 15, energy management unit 2, energy transmission circuit 20, energy control unit 21, self-start unit 30, low-voltage oscillator 31, boost charge pump 32, first capacitor 33, switching tube 34, input sampling unit 22, power regulation unit 23, second capacitor 221, ground terminal 222, sampling resistor 223, first switch 231, voltage regulation unit 24, inductor 241, second switch 242, third switch 243, fourth switch 244, load 25, power supply node 26, power quantity acquisition unit 151, first power supply switch 27, second power supply switch 28, power supply switch control unit 29, sensor 251, information processing unit 252, Bluetooth unit 253. Detailed implementation manners

[0037] An embodiment of the present application provides a display device. The display device of the present application will be described in detail below with reference to the accompanying drawings. Without conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0038] Please refer to Figure 1 and Figure 2 , Figure 1 which is a structural block diagram of the display device 1 provided in an embodiment of the present application; Figure 2 which is a principle block diagram of the display device 1 provided in an embodiment of the present application.

[0039] As shown in Figure 1 and Figure 2 , the display device 1 includes a display screen 10, an energy storage unit 15, an energy management unit 2, and a self-start unit 30. The display screen 10 includes a transparent photovoltaic layer 11 and a display layer 12, and the transparent photovoltaic layer 11 and the display layer 12 are stacked. In the display device 1 provided in the present application, by making the display screen 10 include the transparent photovoltaic layer 11 and the display layer 12, and stacking the transparent photovoltaic layer 11 and the display layer 12, the display screen 10 can not only be used for display but also collect energy, which is convenient for miniaturization of the display device 1 and solves the problem of too low volume utilization efficiency of traditional non-transparent photovoltaic sensors with screens.

[0040] In some embodiments, the transparent photovoltaic layer 11 includes a photovoltaic energy source formed by connecting a plurality of subsystems composed of a conductive electrode, perovskite, and its associated circuit elements in series, and generates an electric current when exposed to electromagnetic radiation. The conductive oxide perovskite has high transparency to ensure the display effect of the lower display layer 12.

[0041] In Figure 1 the illustrated embodiment, the transparent photovoltaic layer 11 and the display layer 12 partially overlap, and the size of the transparent photovoltaic layer 11 is larger than that of the display layer 12. In this way, the area of the transparent photovoltaic layer 11 can be increased, and the efficiency of energy collection can be improved. In some other embodiments, the transparent photovoltaic layer 11 and the display layer 12 completely overlap, taking into account both the efficiency of energy collection and the miniaturization of the display device 1.

[0042] In Figure 1 the illustrated embodiment, the display screen 10 further includes a transparent cover plate 13, and the transparent cover plate 13 covers the transparent photovoltaic layer 11. The transparent cover plate 13 can be used to protect the transparent photovoltaic layer 11 and isolate the transparent photovoltaic layer 11 from the user, playing a role in protecting the user. In Figure 1 the illustrated embodiment, the display device 1 further includes a frame 14, and the transparent photovoltaic layer 11, the display layer 12 and the transparent cover plate 13 can be arranged in the frame 14. The frame 14 plays a supporting role for the transparent photovoltaic layer 11, the display layer 12 and the transparent cover plate 13, and the energy storage unit 15, the energy management unit 2 and the self-starting unit 30 can be arranged inside the frame 14.

[0043] The energy management unit 2 includes an energy transmission circuit 20 and an energy control unit 21. The energy transmission circuit 20 is connected between the transparent photovoltaic layer 11 and the energy storage unit 15 and is used to transmit the electric energy generated by the transparent photovoltaic layer 11 to the energy storage unit 15. The energy storage unit 15 is connected to the energy control unit 21 and the display layer 12 and is used to supply power to the energy control unit 21 and the display layer 12. The energy control unit 21 is connected to the energy transmission circuit 20 and is used to control the on / off of the energy transmission circuit 20. When the energy control unit 21 controls the energy transmission circuit 20 to be turned on, the energy transmission circuit 20 transmits the energy generated by the transparent photovoltaic layer 11 to the energy storage unit 15. When the energy control unit 21 controls the energy transmission circuit 20 to be turned off, the energy generated by the transparent photovoltaic layer 11 cannot be transmitted to the energy storage unit 15.

[0044] The self-starting unit 30 is connected between the transparent photovoltaic layer 11 and the energy control unit 21 and is used to, when the display device 1 starts up, in the case where the voltage of the energy storage unit 15 is lower than the operating voltage of the energy control unit 21 and the voltage of the energy generated by the transparent photovoltaic layer 11 is also not higher than the operating voltage of the energy control unit 21, amplify the first voltage of the electric energy generated by the transparent photovoltaic layer 11 to a second voltage and provide it to the energy control unit 21 so that the energy control unit 21 can operate, and then can control the on / off of the energy transmission circuit 20. Among them, the first voltage is less than the operating voltage of the energy control unit 21, and the second voltage is not less than the operating voltage of the energy control unit 21.

[0045] The display device 1 provided by the present application enables the display screen 10 to include a transparent photovoltaic layer 11 and a display layer 12, and by stacking the transparent photovoltaic layer 11 and the display layer 12, the display screen 10 can not only be used for display but also for energy harvesting, facilitating the miniaturization of the display device 1. By making the display device 1 include an energy storage unit 15, an energy management unit 2, and a self-starting unit 30, and making the energy management unit 2 include an energy transmission circuit 20 and an energy control unit 21, the self-starting unit 30 can, when the display device 1 is started and the voltage of the energy storage unit 15 is insufficient to make the energy control unit 21 operate and the energy of the transparent photovoltaic layer 11 is also insufficient to make the energy control unit 21 operate, amplify the first voltage generated by the transparent photovoltaic layer 11 to a second voltage to supply power to the energy control unit 21, make the energy control unit 21 operate, and then control the energy generated by the transparent photovoltaic layer 11 to be transmitted to the energy storage unit 15, enabling the display device 1 to start without relying on an external power source under weak light conditions.

[0046] Please refer to Figure 3 、 Figure 4 and Figure 5 , Figure 3 which is the principle block diagram of the self-starting unit 30 provided by the embodiment of the present application, Figure 4 is Figure 3 the circuit diagram of the boost charge pump 32 shown in Figure 5 is Figure 4 the schematic diagram of the working principle of the boost charge pump 32 shown in Figures 3 - 5 As shown in Figures 3 - 5 the self-starting unit 30 includes a low-voltage oscillator 31 and a boost charge pump 32. The low-voltage oscillator 31 is connected between the transparent photovoltaic layer 11 and the boost charge pump 32, and the boost charge pump 32 is connected between the transparent photovoltaic layer 11 and the energy control unit 21. The boost charge pump 32 includes a plurality of first capacitors 33 and a plurality of switching tubes 34 connected in cascade. The low-voltage oscillator 31 is connected to the plurality of switching tubes 34 and is used to generate control pulses to control the on / off of the plurality of switching tubes 34, so that the plurality of first capacitors 33 are in parallel during the charging stage and in series during the discharging stage to amplify the first voltage of the electric energy generated by the transparent photovoltaic layer 11 to a second voltage.

[0047] The low-voltage oscillator 31 is connected to the transparent photovoltaic layer 11, and the transparent photovoltaic layer 11 supplies power to the low-voltage oscillator 31. The operating voltage of the low-voltage oscillator 31 is lower than the operating voltage of the energy control unit 21. The voltage of the electric energy generated by the transparent photovoltaic layer 11 under weak light can make the first oscillator 31 operate. After the low-voltage oscillator 31 is powered on, it generates control pulses through oscillation to control the plurality of switching tubes 34 of the boost charge pump 32, so that the plurality of first capacitors 33 are in parallel during the charging stage, as Figure 5As indicated by the blue line, the transparent photovoltaic layer 11 charges multiple first capacitors 33 respectively. During the capacitor charging stage, the input voltage Vin of each first capacitor 33 in the boost charge pump 32 is in parallel with the transparent photovoltaic layer 11. Before the end of this stage, the voltage of each capacitor is charged to Vin. After the charging of multiple first capacitors 33 is completed, the multiple first capacitors 33 are connected in series for discharging. Specifically, the low-voltage oscillator 31 oscillates to generate control pulses to control multiple switching tubes 34 of the boost charge pump 32, so that multiple first capacitors 33 are connected in series and discharge in series, as Figure 5 indicated by the green line in the figure. The function of series connection is to multiply the boost, amplify the first voltage of the electric energy generated by the transparent photovoltaic layer 11 into the second voltage, and then supply power to the energy control unit 21.

[0048] In Figure 4 and Figure 5 the embodiments shown, considering that the initial voltage of the transparent photovoltaic layer 11 is relatively low, two boost charge pumps 32 are connected in parallel to boost the voltage quickly and efficiently. During the capacitor discharging stage, the first capacitors 33 of the upper and lower boost charge pumps 32 are first connected in series and then in parallel to the output terminal, and the output terminal voltage Vout is raised to (n + 1)Vin.

[0049] The low-voltage oscillator 31 drives the boost charge pump 32 to repeat the above cycle at a certain frequency to provide electric energy for the energy control unit 21. When the energy control unit 21 controls the energy transfer circuit 20 to conduct and supply power to the energy storage unit 15, the self-starting unit 30 continues to work to provide energy for the energy control unit 21.

[0050] Please refer to Figure 6 , Figure 6 which is the circuit diagram of the display device 1 provided by the embodiment of the present application. In Figure 6 the embodiment shown, the energy transfer circuit 20 includes an input sampling unit 22 and a power adjustment unit 23. The input sampling unit 22 includes a second capacitor 221 and a grounding terminal 222. The power adjustment unit 23 includes a first switch 231. The second capacitor 221 is connected between the transparent photovoltaic layer 11 and the grounding terminal 222. The first switch 231 is connected between the second capacitor 221 and the energy storage unit 15. The energy control unit 21 is connected to the first switch 231 and is used to control the on / off of the first switch 231 to adjust the power of the energy transfer circuit 20.

[0051] When the transparent photovoltaic layer 11 is irradiated by electromagnetic radiation, the transparent photovoltaic layer 11 generates an input current. The input current charges the second capacitor 221, and the voltage across the second capacitor 221 increases. The input sampling unit 22 further includes a sampling resistor 223. The voltage and current of the energy transfer circuit 20 can be monitored by monitoring the voltage across the second capacitor 221 and the current flowing through the sampling resistor 223.

[0052] The energy control unit 21 realizes maximum power point tracking (MPPT) by controlling the on / off state of the first switch 231. Maximum power point tracking means that according to the current voltage and power characteristics of the transparent photovoltaic layer 11, the on and off times of the first switch 231 are controlled within each charge-discharge cycle to ensure that the transparent photovoltaic layer 11 can always input the maximum power it can provide.

[0053] MPPT is the core function of the energy control unit 21, which is used to ensure that the photovoltaic cell always operates at the maximum power point to maximize the energy collection efficiency. The basic principle of MPPT is to obtain the output voltage at the maximum output power based on the known output power curve of the photovoltaic energy source, and this voltage is the same as the voltage across the second capacitor 221.

[0054] Specifically, when the first switch 231 is turned on, the main flow direction of the charge is from the second capacitor 221 to the backend circuit, resulting in a decrease in the voltage across the second capacitor 221. When the first switch 231 is turned off, the only flow direction of the charge is from the photovoltaic energy source to the second capacitor 221, resulting in an increase in the voltage across the second capacitor 221. Thus, by controlling the on and off times of the first switch 231 in each PWM cycle, the output voltage of the photovoltaic energy source is adjusted to always keep it near the maximum power point voltage. For example, if the maximum output power point voltage of the known photovoltaic energy source is Umpp, in the PWM cycle of the first switch 231, the on time is t. The average value of the voltage of the second capacitor 221 measured over several cycles is Umean. If Umean > Umpp at this time, then t is increased by δt to control Umean to decrease by δU. Conversely, t is decreased by δt to control Umean to increase by δU, so as to control Umean to always be near Umpp.

[0055] In summary, by controlling the on and off of the first switch 231, the energy control unit 21 can not only control the on / off of the energy transmission circuit 20, but also realize maximum power point tracking, enabling the energy source to always input the maximum power it can provide and improving the energy utilization efficiency.

[0056] Please continue to refer to Figure 6 Furthermore, the energy transmission circuit 20 further includes a voltage stabilizing unit 24, which is connected between the first switch 231 and the energy storage unit 15. In some embodiments, the energy transmission circuit 20 further includes a diode, which is disposed between the first switch 231 and the voltage stabilizing unit 24 and is used to prevent energy from flowing from the voltage stabilizing unit 24 to the first switch 231, so that the energy can only flow from the first switch 231 to the voltage stabilizing unit 24.

[0057] The voltage stabilizing unit 24 includes an inductor 241, a second switch 242, a third switch 243, and a fourth switch 244. The inductor 241 is connected between the first switch 231 and the fourth switch 244. The fourth switch 244 is connected between the inductor 241 and the energy storage unit 15. The second switch 242 is connected between one end of the inductor 241 and the ground terminal 222. The third switch 243 is connected between the other end of the inductor 241 and the ground terminal 222. The energy control unit 21 is connected to the second switch 242, the third switch 243, and the fourth switch 244, and is used to control the on-off states of the second switch 242, the third switch 243, and the fourth switch 244 to stabilize the voltage output by the power regulation unit 23.

[0058] Specifically, the first switch 231, the second switch 242, the third switch 243, the fourth switch 244, and the inductor 241 form a DC conversion system, which can operate in the Buck-Boost mode with different duty cycles according to the input-output voltage relationship. By controlling the on-off states of the first switch 231, the second switch 242, the third switch 243, and the fourth switch 244 through the energy control unit 21, the voltage output from the fourth switch 244 is stabilized. The working process of the Buck-Boost circuit can be divided into two parts: the inductor 241 charging stage and the inductor 241 discharging stage. During the inductor 241 charging stage, the energy control unit 21 controls the first switch 231 and the third switch 243 to conduct and the second switch 242 and the fourth switch 244 to turn off. The current forms a loop through the first switch 231 → inductor 241 → third switch 243, and the inductor 241 absorbs electrical energy and stores it as magnetic field energy. At this time, the load 25 at the output end is powered by the energy storage unit 15 and is isolated from the inductor 241 charging loop. During the inductor 241 discharging stage, the energy control unit 21 controls the first switch 231 and the third switch 243 to turn off and the second switch 242 and the fourth switch 244 to conduct. The inductor 241 releases energy to the load 25 through the second switch 242 → fourth switch 244 and charges the energy storage unit 15.

[0059] In Figure 6 the illustrated embodiment, the display device 1 further includes an output voltage identification unit, including a resistor and the energy storage unit 15, which monitors the voltage output from the fourth switch 244 by monitoring the voltage of the energy storage unit 15 and the current flowing through the resistor, and feeds it back to the energy control unit 21 to adjust the duty cycles of the first switch 231, the second switch 242, the third switch 243, and the fourth switch 244 in the DC conversion system to stabilize the voltage output from the fourth switch 244.

[0060] Please refer to Figure 6 and Figure 7 , Figure 7 For Figure 6 the schematic diagram of the working principle of the illustrated display device 1. In Figure 6 andFigure 7 In the embodiment shown, the display device 1 further includes a sensor 251 and an information processing unit 252. The information processing unit 252 is connected between the sensor 251 and the display screen 10, and is configured to process the information collected by the sensor 251 and display the processed information on the display screen 10. Specifically, the information processing unit 252 is connected between the sensor 251 and the display layer 12, and is configured to process the information collected by the sensor 251 and display the processed information on the display layer 12.

[0061] The energy storage unit 15 is connected to the sensor 251 to supply power to the sensor 251. The display device 1 further includes a Bluetooth unit 253. The Bluetooth unit 253 is connected to the information processing unit 252 and is configured to receive and send information. The energy storage unit 15 is connected to the Bluetooth unit 253 to supply power to the Bluetooth unit 253.

[0062] As Figure 7 shown, on the left side of the information processing unit 252 is the sensor 251, which includes a thermometer and a hygrometer. The thermometer is configured to detect the temperature information in the environment, and the hygrometer is configured to detect the humidity information in the environment, and send the temperature information and the humidity information to the information processing unit 252 for processing. In some embodiments, the information processing unit 252 and the energy control unit 21 are integrally provided, and generally an MSP430, STM32 series, etc. or a customized single-chip microcomputer is selected for compilation. The functions completed by it include: receiving external function buttons for function selection and display selection and other controls, outputting control signals to the first switch 231, the second switch 242, the third switch 243, and the fourth switch 244 in the energy transmission circuit 20 to control the on / off of the first switch 231, the second switch 242, the third switch 243, and the fourth switch 244, processing the temperature information and humidity information obtained by the sensor 251, performing analysis and storage. Sending the processed information to the display layer 12 for display through the display screen 10, and receiving and sending data through the Bluetooth unit 253.

[0063] Looking back Figure 6 at Figure 6 the embodiment shown, the display device 1 further includes a load 25 and a power supply node 26. In terms of energy flow, the Bluetooth unit 253, the sensor 251, and the display screen 10 all belong to the load 25. The energy storage unit 15 is connected to the load 25 and the energy control unit 21 through the power supply node 26, and the energy transmission circuit 20 is connected to the energy storage unit 15, the load 25, and the energy control unit 21 through the power supply node 26. In this way, both the energy storage unit 15 and the energy transmission circuit 20 supply power to the load 25 and the energy control unit 21 through the power supply node 26, and the energy transmission circuit 20 supplies power to the energy storage unit 15 through this power supply node 26.

[0064] Please refer to Figure 8 at Figure 8Schematic diagram of the power supply mode for the display device shown below. As Figure 6 shown in the strong source power supply mode in Figure 8 , when the voltage output by the energy transmission circuit 20 is greater than the voltage output by the energy storage unit 15, and the voltage output by the energy transmission unit can be used by the load 25 and the energy control unit 21, the energy transmission unit also supplies power to the energy storage unit 15. Within a certain power supply cycle, the power in the energy storage unit 15 does not decrease, similar to the energy control unit 21 and the load 25 being powered only by the energy transmission circuit 20.

[0065] As Figure 8 shown in the weak source power supply mode in

[0066] When the energy output by the energy transmission circuit 20 is insufficient to supply the load 25 and the energy control unit 21, the energy transmission circuit 20 supplies power to the load 25, the energy control unit 21, and the energy storage unit 15, and the energy storage unit 15 also supplies power to the load 25 and the energy control unit 21. Within a certain power supply cycle, although the energy transmission circuit 20 also supplies power to the energy storage unit 15, the electrical energy in the energy storage unit 15 will decrease, similar to the energy control unit 21 and the load 25 being powered by the energy storage unit 15. Figure 8 As shown in the source disconnection mode in

[0067] When the transparent photovoltaic layer 11 does not output energy, the energy storage unit 15 supplies power to the load 25. In some embodiments, when the transparent photovoltaic layer 11 does not output energy, the energy control unit 21 goes into sleep mode and does not receive power from the energy storage unit 15 to save energy. Therefore, the energy storage unit 15 only supplies power to the load 25 to maintain the normal operation of the display device 1. Figure 8 As shown in the self-start mode in

[0068] Combined with the working principle of the self-start unit 30, when the voltage output by the energy storage unit 15 is not greater than the working voltage of the energy control unit 21 and the voltage output by the transparent photovoltaic layer 11 is also not greater than the working voltage of the energy control unit 21, the self-start unit 30 amplifies the first voltage generated by the transparent photovoltaic layer 11 to a second voltage to supply power to the energy control unit 21 to start the device. And after the device is started, the self-start unit 30 also supplies power to the energy control unit 21. Figure 9 , Figure 9 is the schematic diagram of the structure of the display device 1 provided by another embodiment of the present application. In Figure 9In the illustrated embodiment, the input sampling unit 22 is configured to collect the input power generated by the transparent photovoltaic layer 11, and the energy storage unit 15 is provided with a power quantity collection unit 151 for collecting the power quantity of the energy storage unit 15. A first power supply switch 27 is connected between the power supply node 26 and the energy control unit 21, and a second power supply switch 28 is connected between the power supply node 26 and the load 25. The display device 1 includes a power supply switch control unit 29. The power supply switch control unit 29 and the energy control unit 21 may be provided independently or integrated into the energy control unit 21.

[0069] The power supply switch control unit 29 is connected to the input sampling unit 22 and the power quantity collection unit 151, and is configured to collect the input power of the photovoltaic energy source and the power quantity of the energy storage unit 15, and is connected to the first power supply switch 27 and the second power supply switch 28, and is configured to control the on / off states of the first power supply switch 27 and the second power supply switch 28 according to the input power of the photovoltaic energy source and the power quantity of the energy storage unit 15.

[0070] Specifically, the power supply switch control unit 29 is configured to: when the input power is less than the first power limit value and the power quantity is less than the first power quantity limit value, control the first power supply switch 27 to be turned on and the second power supply switch 28 to be turned on. At this time, after just completing self-startup, both the energy transfer circuit 20 and the energy storage unit 15 can supply power to the energy control unit 21 and the load 25.

[0071] The power supply switch control unit 29 is configured to: when the input power is greater than the first power limit value and less than the second power limit value, and the power quantity is greater than the first power quantity limit value, control the first power supply switch 27 and the second power supply switch 28 to be turned off in the state where the fourth switch 244 is turned on. In the state where the fourth switch 244 is turned off, control the first power supply switch 27 and the second power supply switch 28 to be turned on. In the weak source function case, since the energy generated by the transparent photovoltaic layer 11 is not sufficient to supply the load 25 and the energy control unit 21, the energy storage unit 15 also needs to release energy outward. In one on / off cycle of the fourth switch 244, when the inductor 241 is in the discharging stage and the fourth switch 244 is turned on, the fourth switch 244 outputs energy outward to charge the energy storage unit 15 and supply power to the load 25 and the energy control unit 21. At this time, the energy storage unit 15 also discharges outward to supply power to the load 25 and the energy control unit 21, resulting in the energy storage unit 15 being charged and discharged simultaneously, which will affect the service life of the energy storage unit 15.

[0072] In the embodiment of the present application, when the fourth switch 244 is turned on, the first power supply switch 27 and the second power supply switch 28 are controlled to be turned off, so as to prevent the energy transfer circuit 20 from supplying power to the load 25 and the energy control unit 21, and only allow the energy transfer circuit 20 to supply power to the energy storage unit 15. When the fourth switch 244 is turned off, the first power supply switch 27 and the second power supply switch 28 are controlled to be turned on, so that the energy storage unit 15 can supply power to the energy control unit 21 through the first switch 231 and supply power to the load 25 through the second switch 242.

[0073] The power supply switch control unit 29 is configured to: when the input power is greater than the second power limit value and the power quantity is greater than the first power quantity limit value, control the first power supply switch 27 and the second power supply switch 28 to be turned on when the fourth switch 244 is turned on. Control the first power supply switch 27 and the second power supply switch 28 to be turned off when the fourth switch 244 is turned off.

[0074] In the case of strong source energy supply, since the energy generated by the transparent photovoltaic layer 11 is large enough to provide the energy for the energy control unit 21 and the load 25 to operate, and can also supply power to the energy storage unit 15. In a conduction and cutoff cycle of the fourth switch 244, when the inductor 241 is in the discharging stage and the fourth switch 244 is turned on, the energy transfer circuit 20 outputs energy outward to charge the energy storage unit 15 and supply power to the load 25 and the energy control unit 21. When the inductor 241 is in the charging stage and the fourth switch 244 is turned off, the energy transfer circuit 20 cannot output energy outward. Based on the potential difference, the energy storage unit 15 will output energy outward, causing the energy storage unit 15 to discharge outward frequently, which affects the service life of the energy storage unit 15.

[0075] In the present patent application, when the fourth switch 244 is turned on, the first power supply switch 27 and the second power supply switch 28 are controlled to be turned on. In this way, the energy transfer circuit 20 supplies power to the energy control unit 21 through the first switch 231, supplies power to the load 25 through the second switch 242, and charges the energy storage unit 15. At this time, based on the potential difference, the energy storage unit 15 will not supply power to the load 25 and the energy control unit 21. When the fourth switch 244 is turned off, the first power supply switch 27 and the second power supply switch 28 are controlled to be turned off. In this way, the energy storage unit 15 will not supply power to the load 25 and the energy control unit 21 either. In this way, in the case of strong source energy supply, the energy storage unit 15 will not discharge outward frequently, improving the service life of the energy storage unit 15.

[0076] In Figure 9In the illustrated embodiment, the power supply switch control unit 29 is independently provided from the energy control unit 21. The power supply switch control unit 29 is powered by the energy storage unit 15. Among them, the power supply switch control unit 29 can be provided between the power supply node 26 and the first power supply switch 27, or can be provided between the power supply node 26 and the second power supply switch 28.

[0077] The power supply switch control unit 29 is configured to: when the input power is less than the first power limit value and the power quantity is greater than the first power quantity limit value, control the first power supply switch 27 to be turned off and the second power supply switch 28 to be turned on. In the case of the source being disconnected, the energy control unit 21 does not need to work. Therefore, the power supply switch control unit 29 controls the first power supply switch 27 to be turned off. In this way, the energy storage unit 15 does not supply power to the energy control unit 21 to save energy consumption. By controlling the second power supply switch 28 to be turned on, the energy storage unit 15 can supply power to the load 25, so that the load 25 can continue to work using the energy of the energy storage unit 15 in the case of the source being disconnected.

[0078] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0079] It should be understood that the present application is not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A display device, characterized in that: include: A display screen, comprising a transparent photovoltaic layer and a display layer, wherein the transparent photovoltaic layer and the display layer are stacked; Energy storage unit; An energy management unit, comprising an energy transmission circuit and an energy control unit, wherein the energy transmission circuit is connected between the transparent photovoltaic layer and the energy storage unit and is used to transmit the electric energy generated by the transparent photovoltaic layer to the energy storage unit, the energy storage unit is connected to the energy control unit and the display layer and is used to supply power to the energy control unit and the display layer, and the energy control unit is connected to the energy transmission circuit and is used to control the on and off of the energy transmission circuit; A self-starting unit is connected between the transparent photovoltaic layer and the energy control unit, and is used for amplifying a first voltage of the electric energy generated by the transparent photovoltaic layer into a second voltage and providing the second voltage to the energy control unit when the display device is started and the voltage of the energy storage unit is lower than the working voltage of the energy control unit, wherein the first voltage is lower than the working voltage of the energy control unit and the second voltage is not lower than the working voltage of the energy control unit.

2. The display device according to claim 1, characterized in that The self-starting unit includes a low-voltage oscillator and a boost charge pump, the low-voltage oscillator is connected between the transparent photovoltaic layer and the boost charge pump, and the boost charge pump is connected between the transparent photovoltaic layer and the energy control unit; the boost charge pump includes a plurality of first capacitors and a plurality of switching tubes in cascade, the low-voltage oscillator is connected to the plurality of switching tubes, and is used to generate a control pulse to control the on and off of the plurality of switching tubes, so that the plurality of first capacitors are connected in parallel during the charging stage and in series during the discharging stage, so as to amplify the first voltage of the electric energy generated by the transparent photovoltaic layer to the second voltage.

3. The display device according to claim 1, characterized in that The energy transmission circuit includes an input sampling unit and a power regulation unit, the input sampling unit includes a second capacitor and a ground terminal, the power regulation unit includes a first switch, the second capacitor is connected between the transparent photovoltaic layer and the ground terminal, the first switch is connected between the second capacitor and the energy storage unit, and the energy control unit is connected to the first switch for controlling the on and off of the first switch to regulate the power of the energy transmission circuit.

4. The display device according to claim 3, characterized in that The energy transmission circuit also includes a voltage stabilizing unit connected between the first switch and the energy storage unit, the voltage stabilizing unit includes an inductor, a second switch, a third switch and a fourth switch, the inductor is connected between the first switch and the fourth switch, the fourth switch is connected between the inductor and the energy storage unit, the second switch is connected between one end of the inductor and the ground terminal, the third switch is connected between the other end of the inductor and the ground terminal, the energy control unit is connected to the second switch, the third switch and the fourth switch, and is used to control the on and off of the second switch, the third switch and the fourth switch to stabilize the voltage output by the power regulation unit.

5. The display device according to claim 4, characterized in that The display device also includes a load and a power supply node, the energy storage unit is connected to the load and the energy control unit through the power supply node, and the energy transmission circuit is connected to the energy storage unit, the load and the energy control unit through the power supply node.

6. The display device according to claim 5, characterized in that The input sampling unit is used to collect the input power generated by the transparent photovoltaic layer. The energy storage unit is provided with a power collection unit for collecting the power of the energy storage unit. A first power switch is connected between the power supply node and the energy control unit, and a second power switch is connected between the power supply node and the load. The display device includes a power switch control unit, which is connected to the input sampling unit and the power collection unit, and is connected to the first power switch and the second power switch. The power switch control unit is used to: When the input power is less than a first power limit and the power quantity is less than a first power limit, controlling the first power switch to be turned on and the second power switch to be turned on; and / or When the input power is greater than the first power limit and less than the second power limit, and the power quantity is greater than the first power limit, when the fourth switch is turned on, the first power switch and the second power switch are controlled to be turned off; when the fourth switch is turned off, the first power switch and the second power switch are controlled to be turned on; and / or When the input power is greater than the second power limit and the power quantity is greater than the first power limit, when the fourth switch is turned on, controlling the first power switch and the second power switch to be turned on; When the fourth switch is turned off, the first power switch and the second power switch are controlled to be turned off.

7. The display device according to claim 6, characterized in that The power switch control unit is independently configured from the energy control unit, and is used to control the first power switch to be disconnected and the second power switch to be turned on when the input power is less than a first power limit and the power quantity is greater than a first power limit.

8. The display device according to claim 6, characterized in that The power switch control unit is independently arranged from the energy control unit or integrated into the energy control unit.

9. The display device according to claim 1, characterized in that: It also includes a sensor and an information processing unit, wherein the information processing unit is connected between the sensor and the display screen, and is used to process the information collected by the sensor and display the processed information on the display screen, and the energy storage unit is connected to the sensor, and is used to supply power to the sensor; and / or It also includes a Bluetooth unit, which is connected to the information processing unit, and the energy storage unit is connected to the Bluetooth unit for supplying power to the Bluetooth unit.

10. The display device according to claim 1, characterized in that The transparent photovoltaic layer and the display layer completely or partially overlap; and / or The display screen further comprises a transparent cover plate, and the transparent cover plate covers the transparent photovoltaic layer.

Images