Low power consumption driving circuit and LED display

Abstract

The utility model proposes a low-power drive circuit and an LED display screen, wherein the low-power drive circuit comprises a DC circuit, a switch circuit and a control card, the control card detects the working state of the current LED display screen, when a picture signal is detected, the trigger switch circuit is turned on, the LED display module receives a DC power supply and a ground signal, and the LED display module is in a normal working state, when a standby trigger signal is detected, the trigger switch circuit is turned off, the LED display module does not receive a ground signal, the LED display module has no current signal flowing, the LED display module switches to a low-power mode, no power consumption is generated, and the standby power consumption is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of LED display screens, and in particular relates to a low-power consumption driving circuit and an LED display screen. Background Art

[0002] With the rapid development of science and technology, energy conservation and emission reduction are particularly important for the whole country and even the whole world. Among them, based on the thinking of the LED display industry, reducing the power consumption of LED display screens is to reduce the excessive consumption of resources such as electricity, so as to achieve the purpose of energy conservation and environmental protection.

[0003] However, for LED displays, high power consumption has always been a problem that is difficult to significantly optimize, and it is not only reflected in use. For some scenarios, the frequency of user use is not very high. When the screen is in standby black screen state, the power consumption cannot be underestimated, and there is a problem of high standby power consumption. Utility Model Content

[0004] The utility model aims to provide a low-power drive circuit, aiming to solve the problem of high standby power consumption in traditional LED display screens.

[0005] The first aspect of the embodiment of the utility model provides a low-power driving circuit, which is applied to an LED display screen. The low-power driving circuit includes:

[0006] A DC circuit, wherein a power supply terminal of the DC circuit is connected to a power supply terminal of the LED display module, and the DC circuit is used to provide a DC power supply;

[0007] A switch circuit, wherein a first end of the switch circuit is connected to a ground end of the LED display module, a second end of the switch circuit is grounded, the switch circuit is triggered to turn on by a first level signal and provide a ground signal to drive the LED display module to switch to a working mode, and is triggered to turn off by a second level signal and control the LED display module to switch to a low power consumption mode;

[0008] The control card is connected to the switch circuit. The control card is triggered by a standby trigger signal to output the second level signal, and is triggered by a picture signal to output the first level signal.

[0009] Optionally, the switch circuit includes:

[0010] A load switch, wherein a first end of the load switch is connected to a ground end of the LED display module, a second end of the load switch is grounded, and the switch circuit is triggered to turn on by a third level signal and provide a ground signal to drive the LED display module to switch to a working mode, and is triggered to turn off by a fourth level signal and control the LED display module to switch to a low power consumption mode;

[0011] The signal amplifying circuit is respectively connected to the DC circuit, the load switch and the control card, and is used to amplify the first level signal output by the control card into the third level signal, and to amplify the second level signal output by the control card into the fourth level signal.

[0012] Optionally, the load switch is an NMOS transistor, and the drain, source and gate of the NMOS transistor are respectively the first end, the second end and the control end of the load switch.

[0013] Optionally, the maximum continuous current of the NMOS transistor is 68A.

[0014] Optionally, the signal amplifying circuit includes a first triode, a second triode, a first resistor, a second resistor and a third resistor;

[0015] The first end of the first resistor constitutes the signal input end of the signal amplifying circuit, the second end of the first resistor, the base of the first transistor and the base of the second transistor are connected, the collector of the first transistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the power supply end of the DC circuit, the emitter of the first transistor, the first end of the third resistor and the emitter of the second transistor are connected, the collector of the second transistor is grounded, and the second end of the third resistor constitutes the signal output end of the signal amplifying circuit.

[0016] Optionally, the switch circuit further includes:

[0017] The fast recovery circuit is connected between the load switch and the signal amplifying circuit, and is used to restore the amplitude of the level signal output by the signal amplifying circuit to a baseline level.

[0018] Optionally, the fast recovery circuit includes a diode;

[0019] An anode of the diode is connected to the second end of the third resistor, and a cathode of the diode is connected to the first end of the third resistor.

[0020] Optionally, the low power consumption driving circuit further includes a discharge resistor, a first end of the discharge resistor is connected to the gate of the NMOS transistor, and a second end of the discharge resistor is grounded.

[0021] Optionally, the low power consumption driving circuit further includes:

[0022] The display circuit is connected between the control card and the LED display module, and is used to convert the picture signal into a display control signal to drive the LED display module to display corresponding image information.

[0023] A second aspect of the embodiment of the utility model provides an LED display screen, comprising an LED display module and the low-power drive circuit as described above, wherein the low-power drive circuit is connected to the LED display module.

[0024] Compared with the prior art, the beneficial effects of the embodiments of the utility model are as follows: the above-mentioned low-power driving circuit includes a DC circuit, a switching circuit and a control card, the control card detects the working status of the current LED display screen, when a picture signal is detected, the trigger switch circuit is turned on, the LED display module receives a DC power supply and a ground signal, and the LED display module is in a normal working state, when a standby trigger signal is detected, the trigger switch circuit is turned off, the LED display module does not receive a ground signal, no current signal flows in the LED display module, the LED display module switches to a low power consumption mode, no power consumption is generated, and the standby power consumption is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A schematic diagram of a first module of an LED display screen provided by an embodiment of the utility model;

[0027] Figure 2 A schematic diagram of a second module of an LED display screen provided by an embodiment of the utility model;

[0028] Figure 3 A first circuit diagram of a low-power drive circuit provided by an embodiment of the utility model;

[0029] Figure 4 A third module schematic diagram of the LED display screen provided by the embodiment of the utility model;

[0030] Figure 5 A second circuit diagram of a low-power drive circuit provided by an embodiment of the utility model;

[0031] Figure 6 A fourth module schematic diagram of the LED display screen provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] The first aspect of the embodiment of the utility model proposes a low-power driving circuit, which is applied to an LED display screen. The LED display screen includes an LED display module and a low-power driving circuit. The low-power driving circuit is used to drive the LED display module to switch to a corresponding working mode or a low-power mode.

[0035] like Figure 1 As shown, in this embodiment, the low power consumption driving circuit 100 includes:

[0036] A DC circuit 10, a power supply end of the DC circuit 10 is connected to a power supply end of the LED display module 200, and the DC circuit 10 is used to provide a DC power supply VCC;

[0037] A switch circuit 20, wherein a first end of the switch circuit 20 is connected to a ground end of the LED display module 200, and a second end of the switch circuit 20 is grounded. The switch circuit 20 is triggered to turn on by a first level signal and provide a ground signal to drive the LED display module 200 to switch to a working mode, and is triggered to turn off by a second level signal and control the LED display module 200 to switch to a low power consumption mode;

[0038] The control card 30 is connected to the switch circuit 20. The control card 30 is triggered by the standby trigger signal to output the second level signal, and is triggered by the picture signal to output the first level signal.

[0039] In this embodiment, when the LED display screen is put into operation, the control card 30 is connected and communicated with the terminal device, which may be one or more terminal devices, and obtains an external display source signal. The display source signal includes a picture signal or a standby trigger signal. The standby trigger signal can be automatically recognized and triggered by the system, and can also be considered as an operation trigger, such as triggering the output of the standby trigger signal by changing the software, plugging and unplugging the network cable or the video signal cable. The control card 30 can also be connected to remote control devices, buttons and other devices to receive the standby trigger signal.

[0040] When the LED display screen switches to the normal display working mode, the terminal device outputs a picture signal, the control card 30 detects and identifies the picture signal, and triggers the output of a first level signal to the switch circuit 20. The switch circuit 20 serves as a low-side driver of the LED display module 200. When receiving the first level signal, it triggers conduction and provides a ground signal to the LED display module 200. The LED display module 200 receives the DC power supply VCC and the ground signal, and a current loop is formed inside the LED display module 200. The LED display module 200 switches the working mode and displays the corresponding image information according to the pre-stored data information or the input data information.

[0041] When the LED display screen switches to the low power consumption mode in the standby state, the corresponding modules such as the terminal device, the remote control device, and the button output a standby trigger signal to the control card 30. After receiving the standby trigger signal, the control card 30 triggers the output of the second level signal to the switch circuit 20. The switch circuit 20 triggers the shutdown. The LED display module 200 only receives the DC power supply VCC, but remains disconnected from the ground terminal. No current loop is formed inside the LED display module 200, and the LED display module 200 cannot work and switches to the low power consumption mode. Since there is no current loop, the LED lamp and / or LED driving circuit inside the LED display module 200 generates no power consumption, thereby reducing the power consumption of the LED display screen in the standby state.

[0042] Among them, the control card 30 can be a control module such as MCU, single-chip microcomputer, CPU, GPU, etc., the switching circuit 20 can adopt a switching device with controlled on and off, the DC circuit 10 can adopt a corresponding voltage stabilizing circuit, voltage divider circuit, etc., and the LED display screen can also include a power input port. The DC circuit 10 is connected to the power input port and switches the working voltage of the output LED display module 200.

[0043] The power supply end of the control card 30 can be connected to the power input port, or to the power supply end of the DC circuit 10. The specific connection method is not limited. In the low power consumption mode, the control card 30 remains in working state, and its power consumption is very small compared to the LED display module 200.

[0044] In an alternative embodiment, if Figure 2 As shown, the switch circuit 20 includes:

[0045] A load switch 21, wherein a first end of the load switch 21 is connected to a ground end of the LED display module 200, and a second end of the load switch 21 is grounded. The switch circuit 20 is triggered to turn on by a third level signal and provide a ground signal to drive the LED display module 200 to switch to a working mode, and is triggered to turn off by a fourth level signal and control the LED display module 200 to switch to a low power consumption mode;

[0046] The signal amplifying circuit 22 is connected to the DC circuit 10, the load switch 21 and the control card 30 respectively. The signal amplifying circuit 22 is used to amplify the first level signal output by the control card 30 into a third level signal, and to amplify the second level signal output by the control card 30 into a fourth level signal.

[0047] In this embodiment, in the working mode, the load switch 21 works under a large current load, and the amplitude of the level signal required for its switching on and off is larger. In order to ensure that the load switch 21 can be reliably switched on and off and quickly shut down under a large current load, a signal amplification circuit 22 is arranged between the control card 30 and the load switch 21. The signal amplification circuit 22 amplifies and controls the level signal output by the control card 30, effectively solving the problem that the load switch 21 cannot be normally switched on and off or quickly switched on and off after being connected to the driving LED display module 200.

[0048] Among them, when the LED display screen switches to the normal display working mode, the terminal device outputs a picture signal, the control card 30 detects and identifies the picture signal, and triggers the output of a first level signal to the signal amplification circuit 22. The signal amplification circuit 22 amplifies and controls the first level signal, and converts it into a third level signal with a larger voltage amplitude to the load switch 21. The load switch 21 serves as a low-side driver of the LED display module 200. When receiving the third level signal, it triggers conduction and provides a ground signal to the LED display module 200. The LED display module 200 receives the DC power supply VCC and the ground signal. A current loop is formed inside the LED display module 200, and the LED display module 200 switches the working mode and displays the corresponding image information according to the pre-stored data information or the input data information.

[0049] When the LED display screen switches to the low power consumption mode in the standby state, the corresponding modules such as the terminal device, the remote control device, and the button output a standby trigger signal to the control card 30. After receiving the standby trigger signal, the control card 30 triggers the output of the second level signal to the signal amplifying circuit 22. The signal amplifying circuit 22 amplifies and controls the second level signal, and converts it into a fourth level signal to the load switch 21. The load switch 21 is triggered to shut down. The LED display module 200 only receives the DC power supply VCC, and remains disconnected from the ground terminal. No current loop is formed inside the LED display module 200, and the LED display module 200 cannot work and switches to the low power consumption mode. Since there is no current loop, the LED lamp and / or LED driving circuit inside the LED display module 200 generates no power consumption, thereby reducing the power consumption of the LED display screen in the standby state.

[0050] Furthermore, the load switch 21 is disposed at the ground terminal of the LED display module 200 to realize low-side driving. The low-power driving circuit 100 does not need to be provided with a dedicated boost circuit, which can reduce the design cost.

[0051] The load switch 21 can be set according to the load requirement of the LED display module 200. In an optional embodiment, Figure 3 As shown, the load switch 21 is an NMOS transistor US1, and the drain, source and gate of the NMOS transistor US1 are respectively the first end, the second end and the control end of the load switch 21. On the one hand, the NMOS transistor US1 realizes on-off control, thereby triggering the LED display module 200 to switch between the working mode and the low power consumption mode. At the same time, in the working mode, a large current load is driven.

[0052] Among them, the maximum continuous current of the NMOS transistor US1 can be selected according to the operating current of the LED display module 200. In one embodiment, the total current of the LED display module 200 is approximately equal to 40A. In order to reserve a certain margin and avoid excessive heat and derating of the NMOS tube caused by large current, in an optional embodiment, the maximum continuous current of the NMOS transistor US1 is 68A.

[0053] The signal amplifying circuit 22 may be a signal amplifier, a triode amplifying circuit, or the like. In an optional embodiment, Figure 3 As shown, the signal amplifying circuit 22 includes a first transistor Q1, a second transistor Q2, a first resistor R1, a second resistor R2 and a third resistor R3;

[0054] The first end of the first resistor R1 constitutes a signal input end of the signal amplifying circuit 22, the second end of the first resistor R1, the base of the first transistor Q1 and the base of the second transistor Q2 are connected, the collector of the first transistor Q1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the power supply end of the DC circuit 10, the emitter of the first transistor Q1, the first end of the third resistor R3 and the emitter of the second transistor Q2 are connected, the collector of the second transistor Q2 is grounded, and the second end of the third resistor R3 constitutes a signal output end of the signal amplifying circuit 22.

[0055] In this embodiment, when the LED display screen switches to the normal display working mode, the terminal device outputs a picture signal, the control card 30 detects and identifies the picture signal, and triggers the output of a first level signal to the signal amplification circuit 22, the first transistor Q1 is turned on, and the second transistor Q2 is triggered to turn off, the first transistor Q1 amplifies the first level signal, and converts it into a third level signal with a larger voltage amplitude to the load switch 21, the load switch 21 serves as a low-side driver of the LED display module 200, and is triggered to turn on and provide a ground signal to the LED display module 200 when receiving the third level signal, the LED display module 200 receives the DC power supply VCC and the ground signal, a current loop is formed inside the LED display module 200, the LED display module 200 switches the working mode, and displays the corresponding image information according to the pre-stored data information or the input data information.

[0056] When the LED display screen switches to the low power consumption mode in the standby state, the corresponding modules such as the terminal device, the remote control device, and the button output a standby trigger signal to the control card 30. After receiving the standby trigger signal, the control card 30 triggers the output of the second level signal to the signal amplifying circuit 22. The first transistor Q1 is triggered to turn off, and the second transistor Q2 is triggered to turn on. The second transistor Q2 amplifies and controls the second level signal and converts it into a fourth level signal to the load switch 21. The load switch 21 is triggered to turn off. The LED display module 200 only receives the DC power supply VCC and remains disconnected from the ground terminal. No current loop is formed inside the LED display module 200, and the LED display module 200 cannot work and switches to the low power consumption mode. Since there is no current loop, the LED lamp and / or LED driving circuit inside the LED display module 200 generates no power consumption, thereby reducing the power consumption of the LED display screen in the standby state.

[0057] The first level signal is a high level, and the second level signal is a low level. Correspondingly, the first transistor Q1 is an NPN transistor, and the second transistor Q2 is a PNP transistor.

[0058] like Figure 3 As shown, the low-power driving circuit 100 also includes a first filter capacitor C1, a second filter capacitor C2 and a third filter capacitor C3. The first filter capacitor C1 is used to filter the DC power supply VCC output by the DC circuit 10, and the second filter capacitor C2 and the third filter capacitor C3 filter the first end and the second end of the load switch 21 respectively to reduce clutter interference.

[0059] Furthermore, in order to ensure that the level amplitude of the signal amplifying circuit 22 is maintained at a preset level, in an optional embodiment, as Figure 4 As shown, the switch circuit 20 further includes:

[0060] The fast recovery circuit 23 is connected between the load switch 21 and the signal amplifying circuit 22 . The fast recovery circuit 23 is used to restore the amplitude of the level signal output by the signal amplifying circuit 22 to the baseline level.

[0061] In this embodiment, when the signal amplifying circuit 22 is amplifying the signal, the output level signal may have problems such as amplitude fluctuation or sawtooth wave, resulting in the load switch 21 being unable to switch on and off normally or to switch off quickly. In order to solve this problem, a fast recovery circuit 23 is also provided between the signal amplifying circuit 22 and the load switch 21. The fast recovery circuit 23 performs fast recovery processing on the third level signal or the fourth level signal output by the signal amplifying circuit 22, so that the amplitude of the level signal is restored to the baseline level, thereby ensuring that the load switch 21 is switched on and off normally and quickly, and providing driving reliability of the LED display module 200.

[0062] The fast recovery circuit 23 may be a signal shaping circuit, an amplifier circuit, etc. In an optional embodiment, as shown in FIG. Figure 5 As shown, the fast recovery circuit 23 includes a diode D1;

[0063] The anode of the diode D1 is connected to the second end of the third resistor R3, and the cathode of the diode D1 is connected to the first end of the third resistor R3. The diode D1 receives the level signal output by the third resistor R3, and outputs the level signal in reverse to the first end of the third resistor R3. The level signal is amplitude-superimposed, so that the output level signal is restored to the baseline level.

[0064] When the NMOS transistor US1 is turned off, there may be residual charge on its gate. When the NMOS transistor is turned on next time, the residual charge will affect the on-off state of the NMOS transistor US1. In an optional embodiment, Figure 5 As shown, the low-power driving circuit 100 also includes a discharge resistor R4, a first end of the discharge resistor R4 is connected to the gate of the NMOS transistor US1, and a second end of the discharge resistor R4 is grounded. After the NMOS transistor US1 is turned off, the discharge resistor R4 discharges the gate charge of the NMOS tube to maintain its gate at a preset potential, thereby ensuring that the NMOS transistor US1 can be reliably turned on and off.

[0065] Furthermore, the load switch 21 and the DC circuit 10 are used to realize the power supply of the LED display module 200. When the LED display module 200 is working, it is also necessary to input a corresponding display signal. In an optional embodiment, as shown in FIG. Figure 6 As shown, the low power consumption driving circuit 100 further includes:

[0066] The display circuit 40 is connected between the control card 30 and the LED display module 200 . The display circuit 40 is used to convert the picture signal into a display control signal to drive the LED display module 200 to display corresponding image information.

[0067] In the working mode, the control card 30 receives the picture signal, and at the same time, the picture signal is output to the display circuit 40, the display circuit 40 converts the picture signal and outputs a display control signal to the LED display module 200, so that the LED display module 200 displays the corresponding image information.

[0068] The display control signal may include a corresponding enable signal, a row scan signal, a column scan signal, etc., and the specific signal type is not limited.

[0069] Compared with the prior art, the beneficial effects of the embodiment of the utility model are as follows: the above-mentioned low-power driving circuit 100 includes a DC circuit 10, a switch circuit 20 and a control card 30. The control card 30 detects the working status of the current LED display screen. When a picture signal is detected, the trigger switch circuit 20 is turned on, the LED display module 200 receives the DC power supply VCC and the ground signal, and the LED display module 200 is in a normal working state. When a standby trigger signal is detected, the trigger switch circuit 20 is turned off, the LED display module 200 does not receive the ground signal, and no current signal flows in the LED display module 200. The LED display module 200 switches to a low power consumption mode, no power consumption is generated, and the standby power consumption is reduced.

[0070] The utility model also provides an LED display screen, which includes an LED display module 200 and a low-power drive circuit 100. The specific structure of the low-power drive circuit 100 refers to the above embodiment. Since the LED display screen adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the low-power drive circuit 100 is connected to the LED display module 200.

[0071] In this embodiment, the LED display screen includes an LED display module 200 and a low-power driving circuit 100. The low-power driving circuit 100 is used to drive the LED display module 200 to switch to a corresponding working mode or a low-power mode.

[0072] The LED display module 200 can be composed of multiple boxes, the power supply ends of the multiple boxes are connected in common and connected to the DC circuit 10 of the low-power driving circuit 100, and each box can also be connected to the display circuit 40 through a signal line, and trigger the display of corresponding image information according to the display control signal in the working mode, and trigger switching to the low-power mode in the low-power mode.

[0073] Among them, one or more LED lights and an LED driving circuit, a control module, etc. for driving the LED lights to display can be arranged in the box.

[0074] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A low power consumption driving circuit, applied to LED display screen, characterized in that: The low power consumption driving circuit comprises: A DC circuit, wherein a power supply terminal of the DC circuit is connected to a power supply terminal of the LED display module, and the DC circuit is used to provide a DC power supply; A switch circuit, wherein a first end of the switch circuit is connected to a ground end of the LED display module, a second end of the switch circuit is grounded, the switch circuit is triggered to turn on by a first level signal and provide a ground signal to drive the LED display module to switch to a working mode, and is triggered to turn off by a second level signal and control the LED display module to switch to a low power consumption mode; The control card is connected to the switch circuit. The control card is triggered by a standby trigger signal to output the second level signal, and is triggered by a picture signal to output the first level signal.

2. The low power consumption driving circuit according to claim 1, characterized in that: The switch circuit comprises: A load switch, wherein a first end of the load switch is connected to a ground end of the LED display module, a second end of the load switch is grounded, and the switch circuit is triggered to turn on by a third level signal and provide a ground signal to drive the LED display module to switch to a working mode, and is triggered to turn off by a fourth level signal and control the LED display module to switch to a low power consumption mode; The signal amplifying circuit is respectively connected to the DC circuit, the load switch and the control card, and is used to amplify the first level signal output by the control card into the third level signal, and to amplify the second level signal output by the control card into the fourth level signal.

3. The low power consumption driving circuit according to claim 2, characterized in that: The load switch is an NMOS transistor, and the drain, source and gate of the NMOS transistor are respectively the first end, the second end and the control end of the load switch.

4. The low power consumption driving circuit according to claim 3, characterized in that: The maximum continuous current of the NMOS transistor is 68A.

5. The low power consumption driving circuit according to claim 2, characterized in that: The signal amplifying circuit comprises a first triode, a second triode, a first resistor, a second resistor and a third resistor; The first end of the first resistor constitutes the signal input end of the signal amplifying circuit, the second end of the first resistor, the base of the first transistor and the base of the second transistor are connected, the collector of the first transistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the power supply end of the DC circuit, the emitter of the first transistor, the first end of the third resistor and the emitter of the second transistor are connected, the collector of the second transistor is grounded, and the second end of the third resistor constitutes the signal output end of the signal amplifying circuit.

6. The low power consumption driving circuit according to claim 5, characterized in that: The switch circuit further comprises: The fast recovery circuit is connected between the load switch and the signal amplifying circuit, and is used to restore the amplitude of the level signal output by the signal amplifying circuit to a baseline level.

7. The low power consumption driving circuit according to claim 6, characterized in that: The fast recovery circuit includes a diode; An anode of the diode is connected to the second end of the third resistor, and a cathode of the diode is connected to the first end of the third resistor.

8. The low power consumption driving circuit according to claim 3, characterized in that: The low power consumption driving circuit further includes a discharge resistor, a first end of the discharge resistor is connected to the gate of the NMOS transistor, and a second end of the discharge resistor is grounded.

9. The low power consumption driving circuit according to claim 1, characterized in that: The low power consumption driving circuit further comprises: The display circuit is connected between the control card and the LED display module, and is used to convert the picture signal into a display control signal to drive the LED display module to display corresponding image information.

10. An LED display screen, characterized in that: It comprises an LED display module and a low-power drive circuit as claimed in any one of claims 1 to 9, wherein the low-power drive circuit is connected to the LED display module.

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