Wireless power supply display screen

Abstract

The utility model provides a wireless power supply display screen, and belongs to the technical field of power supply. The wireless power supply display screen comprises a first power supply, a second power supply, a power supply detection module, a power supply switching module, a pulse control module and a display screen control module, the first end of the power detection module is connected with a first power supply. The second end of the power detection module is connected with the control end of the power switching module. The first end of the power switching module is connected with a first power supply, the second end of the power switching module is connected with a second power supply, and the third end of the power switching module is connected with the first end of the display screen control module; the control end of the display screen control module is connected with the output end of the pulse control module, and the pulse control module is configured to output a pulse control signal with the duty ratio corresponding to the light intensity of the environment; the second end of the display screen control module is connected with the power supply end of the display screen. The working reliability of the display screen can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of power supply technology, and more particularly to a wirelessly powered display screen. Background Technology

[0002] Display screens, as crucial information display devices, are widely used in various fields. However, traditional power supply methods for display screens have many limitations. Most existing display screens use wired power, which not only restricts their installation location and usage scenarios but also increases wiring costs and maintenance difficulties. Moreover, if the power supply line fails, the display screen will malfunction, affecting the timely transmission of information and thus compromising its reliable operation. Utility Model Content

[0003] This disclosure provides a wirelessly powered display screen to improve the reliability of the display screen operation.

[0004] This disclosure provides a wirelessly powered display screen, including: a first power supply, a second power supply, a power detection module, a power switching module, a pulse control module, and a display screen control module;

[0005] The first end of the power detection module is connected to the first power source, and the second end of the power detection module is connected to the control terminal of the power switching module. The power detection module is configured to detect the voltage of the first power source.

[0006] The first end of the power switching module is connected to the first power source, the second end of the power switching module is connected to the second power source, and the third end of the power switching module is connected to the first end of the display screen control module.

[0007] The control terminal of the display screen control module is connected to the output terminal of the pulse control module, and the pulse control module is configured to output a pulse control signal with a duty cycle corresponding to the ambient light intensity.

[0008] The second end of the display screen control module is connected to the power supply end of the display screen.

[0009] In one exemplary embodiment of this disclosure, the pulse control module includes: a photosensitive sensor U2, a variable resistor RP1, a diode D1, a diode D2, a capacitor C1, and a timer U1;

[0010] The power supply terminal of timer U1 is connected to VCC power supply. The power supply terminal of timer U1 is connected to the first terminal of rheostat RP1 through the photosensitive sensor U2. The second terminal of rheostat RP1 is connected to the high trigger terminal of timer U1 and the cathode of diode D1. The anode of diode D1 is grounded through capacitor C1. The discharge terminal of timer U1 is connected to the sliding terminal of rheostat RP1 and the anode of diode D2. The cathode of diode D2 is connected to the anode of diode D1 and the low trigger terminal of timer U1. The ground terminal of timer U1 is grounded. The output terminal of timer U1 is connected to the control terminal of the display screen control module.

[0011] In one exemplary embodiment of this disclosure, the display control module includes: transistor Q1 and transistor Q2;

[0012] The base of transistor Q1 is connected to the output terminal of the pulse control module, the collector of transistor Q1 is connected to the collector of transistor Q2, the emitter of transistor Q1 is connected to the base of transistor Q2, the collector of transistor Q2 is connected to the third terminal of the power switching module, the emitter of transistor Q2 is connected to the first power supply terminal of the display screen, and the second power supply terminal of the display screen is grounded.

[0013] In one exemplary embodiment of this disclosure, the power detection module includes: a Zener diode D3, a resistor R2, and a resistor R4; the first power source includes: a battery B1;

[0014] The cathode of the Zener diode D3 is connected to the positive terminal of the battery B1, the negative terminal of the battery B1 is grounded, the anode of the Zener diode D3 is connected to the first end of the resistor R4 through the resistor R2, the second end of the resistor R4 is grounded, and the first end of the resistor R4 is connected to the control terminal of the power switching module.

[0015] In one exemplary embodiment of this disclosure, the power switching module includes: transistor Q3, transistor Q4, transistor Q6, and diode D5; the second power supply includes: energy storage capacitor C4;

[0016] The base of transistor Q3 is connected to the second terminal of the power detection module, the emitter of transistor Q3 is grounded, the collector of transistor Q3 is connected to the base of transistor Q4, the emitter of transistor Q4 is connected to the first power supply, and the collector of transistor Q4 is connected to the first terminal of the display control module.

[0017] The base of transistor Q6 is connected to the second terminal of the power detection module, the emitter of transistor Q6 is connected to the positive terminal of energy storage capacitor C4, the negative terminal of energy storage capacitor C4 is grounded, the collector of transistor Q6 is connected to the anode of diode D5, and the cathode of diode D5 is connected to the first terminal of the display screen control module.

[0018] In one exemplary embodiment of this disclosure, the power switching module further includes: diode D4;

[0019] The anode of the diode D4 is connected to the first power supply, and the cathode of the diode D4 is connected to the positive terminal of the energy storage capacitor C4.

[0020] In one exemplary embodiment of this disclosure, the power switching module further includes: a resistor R5 and a light-emitting diode LED1;

[0021] The first end of the resistor R5 is connected to the anode of the diode D5, the second end of the resistor R5 is connected to the anode of the diode LED1, and the cathode of the diode LED1 is grounded.

[0022] The beneficial effects of the wirelessly powered display screen provided in this disclosure are as follows: Regarding power supply, the power detection module and power switching module work together to monitor the voltage of the first power supply in real time. When the first power supply is insufficient or malfunctions, it can quickly switch to a second power supply for temporary power, ensuring continuous operation of the display screen and preventing display interruptions due to power supply problems, thus improving the stability and reliability of the display screen. In terms of display control, the light intensity detection circuit of the pulse control module can sense the ambient light intensity and output a pulse signal with a corresponding duty cycle to control the display screen control module. This allows the display screen to automatically adjust its brightness according to the ambient light, increasing brightness in strong light to ensure clear display and decreasing brightness in dim light to reduce power consumption, thus optimizing the display effect and achieving energy saving. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a wirelessly powered display screen provided in an embodiment of this disclosure;

[0025] Figure 2 This is a circuit diagram of a wirelessly powered display screen provided in an embodiment of this disclosure. Detailed Implementation

[0026] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0027] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0028] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings:

[0029] Figure 1 This is a schematic diagram of a wirelessly powered display screen provided in an embodiment of this disclosure. (Refer to...) Figure 1 The wirelessly powered display screen includes: a first power supply, a second power supply, a power detection module, a power switching module, a pulse control module, and a display screen control module;

[0030] The first end of the power detection module is connected to the first power source, and the second end of the power detection module is connected to the control terminal of the power switching module. The power detection module is configured to detect the voltage of the first power source.

[0031] The first end of the power switching module is connected to the first power source, the second end of the power switching module is connected to the second power source, and the third end of the power switching module is connected to the first end of the display control module.

[0032] The control terminal of the display control module is connected to the output terminal of the pulse control module. The pulse control module is configured to output a pulse control signal with a duty cycle corresponding to the ambient light intensity.

[0033] The second end of the display control module is connected to the power supply end of the display screen.

[0034] In this embodiment, the first unit is the main power supply, which can be a battery, and the second power supply is a temporary power supply, which can be an energy storage capacitor.

[0035] The power detection module is used to detect the voltage of the first power supply. By monitoring the voltage of the first power supply in real time, the power detection module can determine whether the first power supply is in a normal operating state. Based on the detected voltage of the first power supply, the power detection module can send a control signal to the power switching module.

[0036] When the first power supply voltage is within the normal range, the power detection module can send a corresponding control signal to enable the power switching module to connect the first power supply to the display control module. At this time, the first power supply supplies power to the display control module, and in turn supplies power to the display screen.

[0037] When the voltage of the first power supply is lower than the set threshold, it indicates that the first power supply may be insufficient or malfunctioning. The power detection module can send a switching signal to disconnect the power switching module from the first power supply and instead connect the second power supply (energy storage capacitor) to the display control module. The second power supply will then supply power to the display screen, ensuring that the display screen can continue to work for a period of time, thus serving as a temporary power supply.

[0038] In practical applications, multiple primary power sources (batteries) can be included. The primary power sources can be made removable, so that if the current battery power is insufficient, another battery can be replaced in time to provide power.

[0039] The pulse control module can be equipped with a light intensity detection circuit to detect the ambient light intensity and then output a pulse signal with a corresponding duty cycle based on the light intensity. This pulse signal is used to control the display control module. In a brightly lit environment, to make the displayed content clearer, the pulse control module will output a pulse signal with a larger duty cycle; while in a dimly lit environment, to reduce power consumption and avoid eye irritation, the pulse control module will output a pulse signal with a smaller duty cycle.

[0040] The display screen control module can consist of a control switch, whose control terminal is connected to the output terminal of the pulse control module to receive pulse control signals. The pulse control signals can control the switching on and off, thereby regulating the power supplied to the display screen. By changing the duty cycle of the pulse signal, the power supply time ratio of the display screen can be changed, thus adjusting the brightness of the display screen.

[0041] For example, when the duty cycle of the pulse signal is large, the control switch has a long conduction time, the display screen receives more power, and the brightness is high; when the duty cycle of the pulse signal is small, the control switch has a short conduction time, the display screen receives less power, and the brightness is low.

[0042] As can be seen from the above, in terms of power supply, this embodiment, through the cooperation of the power detection module and the power switching module, can monitor the voltage of the first power supply in real time. When the first power supply is insufficient or malfunctions, it can quickly switch to the second power supply for temporary power supply, ensuring continuous operation of the display screen and avoiding display interruption due to power supply problems, thus improving the stability and reliability of the system. In terms of display control, the light intensity detection circuit of the pulse control module can sense the ambient light intensity and output a pulse signal with a corresponding duty cycle to control the display screen control module. This allows the display screen to automatically adjust its brightness according to the ambient light, increasing brightness in strong light to ensure clear display and decreasing brightness in dim light to reduce power consumption, thus optimizing the display effect and achieving energy saving.

[0043] like Figure 2 As shown, in one embodiment of this disclosure, the pulse control module includes: a photosensitive sensor U2, a variable resistor RP1, a diode D1, a diode D2, a capacitor C1, and a timer U1;

[0044] The power supply terminal of timer U1 is connected to VCC power. The power supply terminal of timer U1 is connected to the first terminal of rheostat RP1 through photosensitive sensor U2. The second terminal of rheostat RP1 is connected to the high trigger terminal of timer U1 and the cathode of diode D1. The anode of diode D1 is grounded through capacitor C1. The discharge terminal of timer U1 is connected to the sliding terminal of rheostat RP1 and the anode of diode D2. The cathode of diode D2 is connected to the anode of diode D1 and the low trigger terminal of timer U1. The ground terminal of timer U1 is grounded. The output terminal of timer U1 is connected to the control terminal of the display control module.

[0045] In this embodiment, a 555 timer can be used as timer U1. The photosensitive sensor U2, the rheostat RP1, the diode D1, the diode D2, the capacitor C1, and the timer U1 constitute a pulse generation circuit, which is used to output a pulse signal with a duty cycle corresponding to the ambient light intensity to control the display screen control module.

[0046] The photosensitive sensor U2 is used to detect the light intensity of the operating environment of the display screen. When the ambient light intensity changes, the resistance value of the photosensitive sensor U2 will change accordingly. Since the current flowing through the photosensitive sensor U2 is related to its resistance, the change in light intensity will cause the current flowing through it to change, which in turn changes the voltage applied to the variable resistor RP1.

[0047] The duty cycle of the pulse signal output by the pulse control module is determined by the voltage at the sliding terminal of the variable resistor RP1. Changes in ambient light intensity can cause a change in the resistance of the photosensitive sensor U2, which in turn changes the voltage across the variable resistor RP1, thus altering the voltage at the sliding terminal. This change in the sliding terminal voltage affects the charging and discharging time of capacitor C1, thereby altering the ratio of the high-level to the low-level time of the pulse signal, i.e., the duty cycle.

[0048] For example, when the light intensity increases, the resistance of the photosensitive sensor U2 decreases, the voltage across the variable resistor RP1 changes, causing a change in the charging and discharging time of capacitor C1, and consequently changing the duty cycle of the output pulse signal. Ultimately, the pulse signal with the changing duty cycle is output from the output terminal of timer U1 and connected to the control terminal of the display control module, enabling intelligent adjustment of the display brightness.

[0049] like Figure 2 As shown, in one embodiment of this disclosure, the display control module includes: transistor Q1 and transistor Q2;

[0050] The base of transistor Q1 is connected to the output terminal of the pulse control module, the collector of transistor Q1 is connected to the collector of transistor Q2, the emitter of transistor Q1 is connected to the base of transistor Q2, the collector of transistor Q2 is connected to the third terminal of the power switching module, the emitter of transistor Q2 is connected to the first power supply terminal of the display screen, and the second power supply terminal of the display screen is grounded.

[0051] In this embodiment, when the pulse signal output by the pulse control module is high, transistor Q1 is turned on. At this time, current can flow from the collector to the emitter of transistor Q1 as the bias current for the base of transistor Q2, causing transistor Q2 to also turn on. Then, the power output from the third terminal of the power switching module supplies power to the display screen through the turned-on transistor Q2, and the display screen is lit.

[0052] When the pulse signal is low, the base of transistor Q1 does not have sufficient forward bias voltage, so transistor Q1 is cut off. No current is supplied to the base of transistor Q2, so transistor Q2 is also cut off. The power supply path between the power switching module and the display screen is cut off, and the display screen stops receiving power and remains off.

[0053] In practical applications, because the frequency of the pulse control signal is high, the human eye cannot observe the flickering of the display screen.

[0054] The duty cycle of the pulse signal output by the pulse control module changes according to the ambient light intensity. When the duty cycle is large, the high-level pulse signal lasts for a longer period, the transistors Q1 and Q2 conduct for a longer time, and the display receives power for a longer period, resulting in higher brightness. Conversely, when the duty cycle is small, the high-level pulse signal lasts for a shorter period, the transistors Q1 and Q2 conduct for a shorter time, and the display receives power for a shorter period, resulting in lower brightness. This achieves intelligent adjustment of the display brightness based on the ambient light intensity.

[0055] like Figure 2 As shown, in one embodiment of this disclosure, the power detection module includes: a Zener diode D3, a resistor R2, and a resistor R4; the first power source includes: a battery B1;

[0056] The cathode of Zener diode D3 is connected to the positive terminal of battery B1, and the negative terminal of battery B1 is grounded. The anode of Zener diode D3 is connected to the first end of resistor R4 through resistor R2. The second end of resistor R4 is grounded. The first end of resistor R4 is connected to the control terminal of the power switching module.

[0057] In this embodiment, when the battery B1 is working normally, the voltage of the battery B1 is greater than the breakdown voltage of the Zener diode D3, and the Zener diode D3 breaks down and conducts; when the battery B1 has too low a charge, or when the power is cut off due to a fault, the Zener diode D3 is cut off.

[0058] When battery B1 is functioning normally, and its output voltage exceeds the breakdown voltage of Zener diode D3, Zener diode D3 will break down and conduct. At this time, current flows from the positive terminal of battery B1, through Zener diode D3 and resistor R2, and then through resistor R4 to ground. A voltage drop is generated across resistor R4, and this voltage drop signal is transmitted to the control terminal of the power switching module. Upon receiving this signal, the power switching module can maintain the current state where battery B1 supplies power to the display control module, because battery B1 can provide power normally at this time.

[0059] When battery B1 has low charge or is disconnected due to a malfunction, its output voltage drops. When the voltage drops below the breakdown voltage of Zener diode D3, D3 turns off. The voltage drop across resistor R4 becomes approximately zero. Upon receiving this near-zero voltage signal, the control terminal of the power switching module determines that battery B1 is unable to supply power normally, thus triggering a power switching operation to switch the power supply from battery B1 to a secondary power source to ensure the display screen can continue to operate normally.

[0060] As can be seen from the above, the power detection module uses the on and off states of the Zener diode D3 and the voltage divider circuit composed of resistors R2 and R4 to convert the voltage state of battery B1 into an electrical signal and transmit it to the power switching module, thereby realizing the detection of the battery's working state and the control of power switching.

[0061] like Figure 2 As shown, in one embodiment of this disclosure, the power switching module includes: transistor Q3, transistor Q4, transistor Q6 and diode D5; the second power supply includes: energy storage capacitor C4;

[0062] The base of transistor Q3 is connected to the second terminal of the power detection module, the emitter of transistor Q3 is grounded, the collector of transistor Q3 is connected to the base of transistor Q4, the emitter of transistor Q4 is connected to the first power supply, and the collector of transistor Q4 is connected to the first terminal of the display control module.

[0063] The base of transistor Q6 is connected to the second terminal of the power detection module, the emitter of transistor Q6 is connected to the positive terminal of energy storage capacitor C4, the negative terminal of energy storage capacitor C4 is grounded, the collector of transistor Q6 is connected to the anode of diode D5, and the cathode of diode D5 is connected to the first terminal of the display control module.

[0064] In this embodiment, an NPN transistor can be used as transistor Q3, and a PNP transistor can be used as transistors Q4 and Q6. Transistors Q3, Q4, and Q6 all operate in a switching state.

[0065] When the power detection module detects that the first power supply is working normally, a voltage signal is generated across resistor R4. When transistor Q3 receives this voltage signal, it turns on. At this time, the emitter of transistor Q3 is grounded, and current flows through its collector. When transistor Q3 is on, the base potential of Q4 is pulled low, turning on transistor Q4 and turning off transistor Q6. The first power supply is connected to the first terminal of the display control module through the conducting transistor Q4, thus enabling the first power supply to power the display control module.

[0066] When the power detection module detects that the first power supply is too low or has malfunctioned, the voltage across resistor R4 becomes 0, and both transistors Q3 and Q4 are cut off. At this time, the base potential of transistor Q6 decreases, and transistor Q6 turns on. The second power supply is connected to the first terminal of the display control module through the conducting transistor Q6 and diode D5, enabling temporary power supply to the display control module from the energy storage capacitor.

[0067] Diode D5 acts as an isolation element to prevent current from flowing back into the energy storage capacitor when the first power supply is working properly, while ensuring that the current can flow smoothly to the display control module when the energy storage capacitor is powered.

[0068] As can be seen from the above, the power switching module, through the switching state changes of transistors Q3, Q4, and Q6, combined with the isolation effect of diode D5, flexibly switches between the first power supply and the second power supply based on the signal from the power detection module, ensuring that the display control module always has a power supply.

[0069] like Figure 2 As shown, in one embodiment of this disclosure, the power switching module further includes: diode D4;

[0070] The anode of diode D4 is connected to the first power supply, and the cathode of diode D4 is connected to the positive terminal of energy storage capacitor C4.

[0071] In this embodiment, diode D4 constitutes the charging circuit. When the first power supply is operating normally, its voltage is higher than the voltage across the energy storage capacitor C4. At this time, diode D4 is forward biased and conducts. Current flows through the conducting diode D4 to the energy storage capacitor C4. As current continues to flow in, the energy storage capacitor C4 begins to charge, and its voltage gradually increases. During the charging process, diode D4 ensures that current can only flow from the first power supply to the energy storage capacitor C4, preventing reverse current flow and avoiding the voltage across the energy storage capacitor C4 from affecting the normal operation of the first power supply.

[0072] As can be seen from the above, the charging circuit composed of diode D4 can charge the energy storage capacitor C4 when the first power supply is working normally, and when charging is completed or the first power supply is abnormal, it can ensure the safety of the circuit and the normal use of the energy storage capacitor C4 through its own conduction and cutoff characteristics, thus providing a guarantee for the stable operation of the entire wireless power supply display system.

[0073] like Figure 2 As shown, in one embodiment of this disclosure, the power switching module further includes: a resistor R5 and a light-emitting diode LED1;

[0074] The first end of resistor R5 is connected to the anode of diode D5, the second end of resistor R5 is connected to the anode of diode LED1, and the cathode of diode LED1 is grounded.

[0075] In this embodiment, resistor R5 and light-emitting diode LED1 constitute an alarm circuit to remind staff to replace the battery.

[0076] When the first power supply is too low or malfunctions, the power detection module detects the abnormality and outputs a corresponding signal, causing transistor Q3 to turn off, which in turn causes transistor Q4 to turn off, cutting off the connection between the first power supply and the display control module; at the same time, transistor Q6 turns on, and the second power supply supplies power to the display control module through transistor Q6 and diode D5.

[0077] At this time, the anode potential of diode D5 increases, and current flows from the anode of diode D5, through resistor R5, and to the anode of LED1. Resistor R5 limits the current, preventing excessive current from flowing through LED1 and thus avoiding damage to LED1 due to excessive current. When a suitable current flows through LED1, LED1 lights up, serving as an alarm signal to remind staff that the primary power supply is abnormal and the battery needs to be replaced promptly.

[0078] From the above, it can be concluded that the alarm circuit composed of resistor R5 and LED1 uses the change in the anode potential of diode D5 during power switching to control the on / off state of LED1, thereby realizing the function of reminding staff to replace the battery when the first power supply is abnormal.

[0079] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A wirelessly powered display screen, characterized in that, include: The system comprises a first power supply, a second power supply, a power detection module, a power switching module, a pulse control module, and a display screen control module. The first end of the power detection module is connected to the first power source, and the second end of the power detection module is connected to the control terminal of the power switching module. The power detection module is configured to detect the voltage of the first power source. The first end of the power switching module is connected to the first power source, the second end of the power switching module is connected to the second power source, and the third end of the power switching module is connected to the first end of the display screen control module. The control terminal of the display screen control module is connected to the output terminal of the pulse control module, and the pulse control module is configured to output a pulse control signal with a duty cycle corresponding to the ambient light intensity. The second end of the display screen control module is connected to the power supply end of the display screen.

2. The wirelessly powered display screen as described in claim 1, characterized in that, The pulse control module includes: a photosensitive sensor U2, a variable resistor RP1, a diode D1, a diode D2, a capacitor C1, and a timer U1; The power supply terminal of timer U1 is connected to VCC power supply. The power supply terminal of timer U1 is connected to the first terminal of rheostat RP1 through the photosensitive sensor U2. The second terminal of rheostat RP1 is connected to the high trigger terminal of timer U1 and the cathode of diode D1. The anode of diode D1 is grounded through capacitor C1. The discharge terminal of timer U1 is connected to the sliding terminal of rheostat RP1 and the anode of diode D2. The cathode of diode D2 is connected to the anode of diode D1 and the low trigger terminal of timer U1. The ground terminal of timer U1 is grounded. The output terminal of timer U1 is connected to the control terminal of the display screen control module.

3. A wirelessly powered display screen as described in claim 1, characterized in that, The display screen control module includes: transistor Q1 and transistor Q2; The base of transistor Q1 is connected to the output terminal of the pulse control module, the collector of transistor Q1 is connected to the collector of transistor Q2, the emitter of transistor Q1 is connected to the base of transistor Q2, the collector of transistor Q2 is connected to the third terminal of the power switching module, the emitter of transistor Q2 is connected to the first power supply terminal of the display screen, and the second power supply terminal of the display screen is grounded.

4. A wirelessly powered display screen as described in claim 1, characterized in that, The power detection module includes: a Zener diode D3, a resistor R2, and a resistor R4; the first power source includes: a battery B1. The cathode of the Zener diode D3 is connected to the positive terminal of the battery B1, the negative terminal of the battery B1 is grounded, the anode of the Zener diode D3 is connected to the first end of the resistor R4 through the resistor R2, the second end of the resistor R4 is grounded, and the first end of the resistor R4 is connected to the control terminal of the power switching module.

5. A wirelessly powered display screen as described in claim 1, characterized in that, The power switching module includes: transistor Q3, transistor Q4, transistor Q6 and diode D5; the second power supply includes: energy storage capacitor C4; The base of transistor Q3 is connected to the second terminal of the power detection module, the emitter of transistor Q3 is grounded, the collector of transistor Q3 is connected to the base of transistor Q4, the emitter of transistor Q4 is connected to the first power supply, and the collector of transistor Q4 is connected to the first terminal of the display control module. The base of transistor Q6 is connected to the second terminal of the power detection module, the emitter of transistor Q6 is connected to the positive terminal of energy storage capacitor C4, the negative terminal of energy storage capacitor C4 is grounded, the collector of transistor Q6 is connected to the anode of diode D5, and the cathode of diode D5 is connected to the first terminal of the display screen control module.

6. A wirelessly powered display screen as described in claim 5, characterized in that, The power switching module further includes: diode D4; The anode of the diode D4 is connected to the first power supply, and the cathode of the diode D4 is connected to the positive terminal of the energy storage capacitor C4.

7. A wirelessly powered display screen as described in claim 5, characterized in that, The power switching module also includes: resistor R5 and light-emitting diode LED1; The first end of the resistor R5 is connected to the anode of the diode D5, the second end of the resistor R5 is connected to the anode of the diode LED1, and the cathode of the diode LED1 is grounded.

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