A negative voltage dual voltage power supply driven LED display

Abstract

A negative voltage dual-voltage power supply driven LED display screen comprises a power supply interface (10) and a display module; the power supply interface (10) comprises a first electrode (11), a second electrode (12) and a third electrode (13); the display module comprises a base plate (20), a wiring terminal (21) is provided on the base plate (20), and a first port (22), a second port (23) and a third port (24) are provided on the wiring terminal (21); the first electrode (11) is connected to the first port (22) via a first wiring harness (30), the second electrode (12) is connected to the second port (23) via a second wiring harness (31), and the third electrode (13) is connected to the third port (24) via a third wiring harness (32); the potential difference between the first electrode (11) and the second electrode (12) provides a first voltage, and the potential difference between the first electrode (11) and the third electrode (13) provides a second voltage, and the first voltage and the second voltage power the display module. Only three wiring harnesses need to be provided to provide two voltages for the display module through one power supply. The space occupied is smaller and the overall weight of the display is also reduced. The reduction of wiring harnesses will also reduce the power consumption of the circuit itself, improve the use efficiency and save power resources.

Description

Technical Field

[0001] The present application relates to the field of electrical technology, and in particular to a negative voltage dual voltage power supply driving a light-emitting diode (LED) display screen. Background Art

[0002] Currently, in the display industry, particularly in the light-emitting diode (LED) display industry, dual-voltage power supply is a common power supply method. This dual-voltage power supply typically utilizes a single 3.8V power supply and a single 2.8V power supply with a common ground. Because two single power supplies are involved, the wiring is complex, resulting in numerous and cluttered lines, making maintenance difficult and significantly increasing the probability of poor contact. Furthermore, the inherent resistance of the lines causes voltage drop and circuit power consumption, reducing power efficiency and wasting energy. Summary of the Invention

[0003] The purpose of this application is to provide an LED display screen driven by a negative voltage dual-voltage power supply. This design utilizes a single power supply to provide dual voltages, simplifying wiring, facilitating easier maintenance, and reducing the likelihood of poor wiring connections. Furthermore, this design reduces circuit power consumption, improves power efficiency, and conserves electricity resources.

[0004] The present application provides an LED display screen driven by a negative voltage dual-voltage power supply, comprising: a power interface and a display module; the power interface comprises a first electrode, a second electrode and a third electrode; the display module comprises a base plate, a wiring terminal is provided on the base plate, and a first port, a second port and a third port are provided on the wiring terminal; the first electrode is connected to the first port through a first wiring harness, the second electrode is connected to the second port through a second wiring harness, and the third electrode is connected to the third port through a third wiring harness; the potential difference between the first electrode and the second electrode provides a first voltage, and the potential difference between the first electrode and the third electrode provides a second voltage, and the first voltage and the second voltage power the display module.

[0005] In the LED display described above, the first electrode is a cathode, the second electrode and the third electrode are cathodes, the first voltage is a first negative voltage, and the second voltage is a second negative voltage. Furthermore, both the first voltage and the second voltage can be negative voltages, thereby reducing power consumption and heating of the circuit itself, thereby extending the service life of the product.

[0006] As described above, the LED display screen, wherein the display module further includes: a light-emitting element, a control circuit and a drive circuit; the drive circuit is connected to the negative pole of the light-emitting element, and the control circuit is connected to the positive pole of the light-emitting element; the first negative voltage or the second negative voltage is used to power the drive circuit; the second negative voltage is used to power the control circuit; after the control circuit receives a control instruction and the drive circuit receives a drive instruction and drives, the light-emitting element emits light.

[0007] The LED display screen as described above, wherein the display screen further includes: a control port; the control port is connected to the control circuit and the drive circuit respectively, and the second negative voltage is used to power the control port; the control port is used to send control instructions to the control circuit and send drive instructions to the drive circuit.

[0008] In the LED display screen as described above, the display module further includes a buffer module, which includes a first buffer chip and a second buffer chip; the control port, the first buffer chip, the second buffer chip, and the drive circuit are connected in sequence; the second negative voltage supplies power to the first buffer chip, and the first negative voltage supplies power to the second buffer chip.

[0009] In the LED display screen described above, the buffer module further includes a level conversion circuit connected between the first buffer chip and the second buffer chip. The level conversion circuit can balance the potential difference between the two, thereby protecting the chip.

[0010] In the LED display screen as described above, the display module further includes: an acquisition circuit; the acquisition circuit is connected between the first port and the light-emitting element; and the acquisition circuit is used to acquire performance parameters of the light-emitting element.

[0011] As described above, the LED display screen, wherein the light-emitting elements include a red light, a green light and a blue light; the drive circuit includes a first drive circuit, a second drive circuit and a third drive circuit; the first drive circuit is connected to the negative pole of the red light, the second drive circuit is connected to the negative pole of the green light, and the third drive circuit is connected to the negative pole of the blue light; the first negative voltage is used to power the first drive circuit, and the second negative voltage is used to power the second drive circuit and the third drive circuit.

[0012] The LED display screen as described above, wherein the display module further includes: a first stabilization chip and a second stabilization chip; the first stabilization chip is connected between the second buffer chip and the first drive circuit; one end of the second stabilization chip is connected to the second buffer chip, and the other end is respectively connected to the second drive circuit and the third drive circuit; the first negative voltage is used to power the first stabilization chip, and the second negative voltage is used to power the second stabilization chip.

[0013] In the LED display screen as described above, the first voltage takes a value within a first set range, and the second voltage takes a value within a second set range.

[0014] In the LED display screen described above, a floating ground anti-interference circuit can also be provided in the display module, and the floating ground anti-interference circuit is connected between the first stabilization chip and the first driving circuit. This configuration achieves the purpose of utilizing the floating ground generated in the circuit through the anti-interference circuit.

[0015] As can be seen from the above, the negative voltage dual-voltage power supply-driven LED display provided in the embodiment of the present application uses one power supply to provide two voltages. When connected, it only needs to set three wiring harnesses, namely the first wiring harness, the second wiring harness and the third wiring harness, to provide two voltages for the display module. Compared with the mode in which two single power supplies each provide one voltage in the background technology, only one power supply is used, which takes up less space and reduces the overall weight of the display. In addition, the use of wiring harnesses is greatly reduced, and the wiring is neat and easy to maintain. The reduction of wiring harnesses will also reduce the consumption of the circuit itself, improve the utilization efficiency, and save power resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained like these drawings without any creative work.

[0017] Figure 1 This is a wiring diagram of the LED display screen provided in the embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of the light-emitting components and driving components of the LED display screen provided in an embodiment of the present application;

[0019] Figure 3 This is a schematic diagram of a buffer module of an LED display screen provided in an embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of a driving circuit for an LED display screen provided in an embodiment of the present application;

[0021] Figure 5 This is a schematic diagram of an LED display screen provided by an embodiment of the present application, wherein the data acquisition circuit is configured;

[0022] Figure 6 A schematic diagram of controlling light-emitting components of an LED display screen provided in an embodiment of the present application.

[0023] Description of reference numerals:

[0024] 10-power interface, 11-first electrode, 12-second electrode, 13-third electrode, 20-bottom plate, 21-connection terminal, 22-first port, 23-second port, 24-third port, 30-first wiring harness, 31-second wiring harness, 32-third wiring harness; 40-light-emitting element, 41-red light, 42-green light, 43-blue light, 50-control circuit, 60-drive circuit, 61-red light drive circuit, 62-green light drive circuit, 63-blue light drive circuit, 64-first stabilization chip, 65-second stabilization chip, 70-control system, 80-buffer module, 81-first buffer chip, 82-second buffer chip, 83-level conversion circuit, 90-acquisition circuit. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] Please refer to Figure 1 The negative voltage dual-voltage power supply-driven LED display provided in the embodiments of the present application includes a power interface 10 and a display module. The power interface 10 includes a first electrode GND 11, a second electrode V1 12, and a third electrode V0 13. The power interface 10 is typically connected to an AC power source, wherein the AC power source includes an AC-DC converter that converts the AC power into low-voltage DC power suitable for use by the display module.

[0027] The display module includes a base plate 20, on which a terminal block 21 is provided. The terminal block 21 is provided with a first port 22, a second port 23, and a third port 24. The first electrode GND11 is connected to the first port 22 via a first wiring harness 30, the second electrode V112 is connected to the second port 23 via a second wiring harness 31, and the third electrode V013 is connected to the third port 24 via a third wiring harness 32. The potential difference between the first electrode GND11 and the second electrode V112 provides a first voltage, and the potential difference between the first electrode GND11 and the third electrode V012 provides a second voltage. The first and second voltages power the display module.

[0028] Please refer to Figure 1 ,visible, Figure 1 The example shows nine connection terminals 21, each of which is provided with a first port 22, a second port 23, and a third port 24. The first port 22 of each connection terminal 21 is connected to the first electrode GND11, the second port 23 of each connection terminal 21 is connected to the second electrode V1 12, and the third port 24 of each connection terminal 21 is connected to the third electrode V0 13.

[0029] Other components of the LED display, such as the driver circuit, can then be powered through the first port 22, the second port 23, and the third port 24. In other words, the driver circuit and other components can simply be connected to the wiring terminal 21. Specifically, when a first voltage is required, the component can be connected to the first port 22 and the second port 23 of one of the wiring terminals 21. When a second voltage is required, the component can be connected to the first port 22 and the third port 24 of one of the wiring terminals 21. Of course, it should be clear that each component that requires power corresponds to a corresponding wiring terminal 21.

[0030] As can be seen from the above, the LED display provided in the embodiment of the present application uses one power supply to provide two voltages. When connected, it only needs to set up three wiring harnesses, namely the first wiring harness 30, the second wiring harness 31 and the third wiring harness 32, to provide two voltages for the display module. Compared with the mode in which two single power supplies each provide one voltage in the background technology, only one power supply is used, which takes up less space and reduces the overall weight of the LED display. In addition, the use of wiring harnesses is greatly reduced, and the wiring is neat and easy to maintain. The reduction of wiring harnesses will also reduce the consumption of the circuit itself, improve the utilization efficiency, and save power resources.

[0031] In addition, providing two voltages, namely a first voltage and a second voltage, can at least meet the voltage requirements of different light-emitting components, thereby improving applicability. It can also avoid providing a higher voltage to light-emitting components with smaller voltage requirements, thereby saving resources. The light-emitting component 4 is a light-emitting diode (LED), which includes three lamp beads: red, green, and blue. Among them, the conventional voltage of the red lamp bead is generally between 2.0 volts and 2.2 volts, the conventional voltage of the green lamp bead is generally between 3.0 volts and 3.4 volts, and the conventional voltage of the blue lamp bead is generally between 3.0 volts and 3.6 volts. Then the first voltage can be set to between 2.0 volts and 2.2 volts, and the second voltage can be set to between 3.0 volts and 3.6 volts. The red lamp bead is referred to as the red light, the green lamp bead is referred to as the green light, and the blue lamp bead is referred to as the blue light.

[0032] Optionally, to further improve applicability and enable the power supply to be used with light-emitting devices 40 of various voltage types, the first voltage range can be set to: 2.8 volts ≤ first voltage ≤ 3.2 volts (a first setting range); and the second voltage range can be set to: 3.8 volts ≤ second voltage ≤ 4.6 volts (a second setting range). In addition to meeting the needs of conventional LEDs, the first and second voltage ranges can also meet the needs of a wider range of other light-emitting devices, providing greater applicability.

[0033] Optionally, in one embodiment, the first electrode GND11 is a cathode, the second electrode V1 12 and the third electrode V0 13 are negative electrodes, that is, the negative electrode is used as an anode; the first voltage is a first negative voltage, and the second voltage is a second negative voltage. That is, the voltage provided by the power supply in this embodiment is a negative voltage. The use of negative voltage has the effect of reducing the radiation of the entire circuit, making it easier for the product to meet the requirements of electromagnetic compatibility (EMC). In addition, the negative voltage can reduce the power consumption of the circuit itself and reduce the heating phenomenon of the circuit, thereby extending the service life of the product. Correspondingly, the first wiring harness 30 is the anode wire, and the second wiring harness 31 and the third wiring harness 32 are the cathode wires.

[0034] Furthermore, it is understood by those skilled in the art that the display module needs to be provided with a light-emitting element for display, and the light-emitting element needs to be driven to emit light. Figure 2The display module also includes a light-emitting element 40, a control circuit 50, and a drive circuit 60. The drive circuit 60 is connected to the cathode of the light-emitting element 40, and the control circuit 50 is connected to the anode of the light-emitting element 40. The first negative voltage or the second negative voltage powers the drive circuit 60, and the second negative voltage powers the control circuit 50. After the control circuit 50 receives a control instruction and the drive circuit 60 receives a drive instruction and drives, the light-emitting element 40 emits light. As can be seen from the above, both the drive circuit 60 and the control circuit 50 are powered by negative voltages. This ensures that the light-emitting element 40 can be driven to emit light normally, while generating less heat and lowering power consumption for the entire circuit, thereby extending the service life of various components. Optionally, the control circuit 50 includes a switching transistor and a decoding circuit, wherein the switching transistor is turned on according to the corresponding instruction, and the decoding circuit decodes the signal. The switching transistor can be a metal-oxide-semiconductor (MOS) field-effect transistor, a triode, an integrated MOS field-effect transistor, or a thyristor, providing a wide range of options.

[0035] It needs to be emphasized that Figure 2 It is not shown in detail which connection terminals the control circuit 50 and the drive circuit 60 are connected to, but those skilled in the art should know that the control circuit 50 and the drive circuit 60 are also powered by connection terminals.

[0036] Please refer to Figure 2, taking the above-mentioned light-emitting element 40 including a red light 41, a green light 42, and a blue light 43 as an example for further explanation, each lamp bead needs to be provided with a drive circuit 60, specifically a first drive circuit 60, a second drive circuit 60, and a third drive circuit 60. Among them, the first drive circuit 60 is connected to the negative electrode of the red light 41, the second drive circuit 60 is connected to the negative electrode of the green light 42, and the third drive circuit 60 is connected to the negative electrode of the blue light 43. The positive electrode of the driver chip of the first drive circuit 60 is connected to the first port 22, and the negative electrode is connected to the second port 23, so that a first negative voltage can be used to power the first drive circuit 60; the positive electrode of the driver chip of the second drive circuit 60 is connected to the first port 22, and the negative electrode is connected to the third port, so that a second negative voltage can be used to power the second drive circuit 60; the positive electrode of the driver chip of the third drive circuit 60 is connected to the first port 22, and the negative electrode is connected to the third port 24, so that a second negative voltage can be used to power the third drive circuit 60. For the red, green, and blue lights 41, 42, and 43, the first drive circuit 60 functions as the red light drive circuit 61, the second drive circuit 60 functions as the green light drive circuit 62, and the third drive circuit 60 functions as the blue light drive circuit 63. After the control circuit 50 receives the control command, and the red light drive circuit 61 receives the drive command and starts driving, the cathode and anode of the red light 41 are connected, causing the red light 41 to emit light. The control process for the green and blue lights 42 and 43 is the same as that for the red light 41, and will not be further described.

[0037] The reason why the first negative voltage is selected to power the first drive circuit 60, and the second negative voltage is selected to power the second drive circuit 60 and the third drive circuit 60 is that the voltage of the red light 41 is relatively small, while the voltages of the green light 42 and the blue light 43 are larger than the red light 41. As mentioned above, the value of the first voltage is smaller than the value of the second voltage. Therefore, this setting can ensure the normal operation of each lamp bead, avoid using a higher voltage for the light-emitting element 40 with a smaller voltage requirement, resulting in a waste of power resources, and avoid causing excess voltage to increase losses, while saving power resources. In addition, using a negative voltage for power supply can reduce the heat of the lamp bead and the drive circuit 60, thereby reducing radiation, making it easier for the product to meet the requirements of electromagnetic compatibility (EMC).

[0038] Alternatively, in one embodiment, please refer to Figure 1The LED display screen may also include a control port connected to the control system 70, through which the control system 70 sends control instructions. The second negative voltage powers the control port, meaning that the two ports on the control port are connected to the first port 22 and the third port 24, respectively, so that the second negative voltage can power the control port. In other words, the control port can be used to power the control system 70. Powering the control port with the second negative voltage ensures the normal operation of the control system 70, namely, the normal transmission of control instructions and drive instructions. It also reduces the energy consumption of the control system 70 and the heat generated by the operation of the control system 70.

[0039] In the control of whether the light is on or off, please refer to Figure 6 The control system 70 sends a control instruction to the control circuit 50 through the control port, and sends a driving instruction to the driving circuit 60 through the control port. After the control circuit 50 receives the control instruction, and the driving circuit 60 receives the driving instruction and drives, the positive and negative electrodes of the light-emitting element 40 are connected, and the light-emitting element 40 can emit light. The driving instruction is a parallel signal.

[0040] For further information, please refer to Figure 3 The display module further includes a buffer module 80, which includes a first buffer chip 81 and a second buffer chip 82, wherein the control port, the first buffer chip 81, the second buffer chip 82 and the drive circuit 60 are connected in sequence. It should be understood that the first buffer chip 81 and the second buffer chip 82 can be provided in only one set. In actual application, the set of the first buffer chip 81 and the second buffer chip 82 are respectively connected to the first drive circuit 60, the second drive circuit 60 and the third drive circuit 60. Please refer to Figure 6 The buffer module 80 is arranged between the control system 70 and the drive circuit 60 , and the drive instructions sent by the control system 70 in the form of parallel signals are transmitted to the drive circuit 60 through the buffer module 80 .

[0041] Both the first buffer chip 81 and the second buffer chip 82 can be 74HC245 chips. The first buffer chip 81 can protect the main chip of the control system 70, while the second buffer chip 82 can protect the driver chip provided in the driver circuit 60. This ensures more stable operation of the LED display, prevents damage to the control system 70 and the driver circuit 60, and extends their lifespan. Furthermore, a second negative voltage can be selected to power the first buffer chip 81. Specifically, the positive electrode of the first buffer chip 81 is connected to the first port 22, and the negative electrode of the first buffer chip 81 is connected to the third port 24. This allows the second negative voltage to power the first buffer chip 81. Furthermore, a first negative voltage can be selected to power the second buffer chip 82. Specifically, the positive electrode of the second buffer chip 82 is connected to the first port 22, and the negative electrode of the second buffer chip 82 is connected to the second port 23. This allows the first negative voltage to power the first buffer chip 81. Of course, the first and second buffer chips 81, 82, can each be powered by a different negative voltage. Regardless of which voltage is used for power supply, it is necessary to ensure that the first buffer chip 81 and the main chip of the control system 70 use the same potential voltage, so as to reduce interference and radiation and achieve signal potential isolation effect.

[0042] In yet another embodiment, referring to Figure 3 The buffer module 80 also includes a level shifter circuit 83 connected to the first buffer chip 81 and the second buffer chip 82. This circuit balances the potential difference between the first and second buffer chips 81, 82, preventing excessive current from the potential difference, which could damage the chips. It also enables the driver circuit 60 to use parallel signals after the potential difference has been reduced, ensuring stable operation. The first buffer chip 81, level shifter circuit 83, and second buffer chip 82 are hardware-integrated into a single module, improving the integration of the LED display and facilitating wiring. The buffer module 80 prevents potential imbalances and prevents damage to the chips.

[0043] In another embodiment, please refer to Figure 4The display module also includes a first stabilizing chip 64 and a second stabilizing chip 65. The first stabilizing chip 64 is connected between the second buffer chip 82 and the first drive circuit 60. One end of the second stabilizing chip 65 is connected to the second buffer chip 82, and the other end is connected to the second drive circuit 60 and the third drive circuit 60, respectively. The first negative voltage powers the first stabilizing chip 64, and the second negative voltage powers the second stabilizing chip 65. Specifically, the positive electrode of the first stabilizing chip 64 is connected to the first port 22, and the negative electrode of the first stabilizing chip 64 is connected to the second port 23. The positive electrode of the second stabilizing chip 65 is connected to the first port 22, and the negative electrode of the second stabilizing chip 65 is connected to the third port 24. Both the first stabilizing chip 64 and the second stabilizing chip 65 can be 74HC245 chips. Accordingly, the number of second buffer chips 82 can be one, or optionally two. One second buffer chip is connected to the first stabilizing chip and is powered by the same negative voltage as the first stabilizing chip. The other second buffer chip is connected to the second stabilizing chip and is powered by the same negative voltage as the second stabilizing chip. This setting can reduce the potential difference between the two connected chips, prevent potential imbalance, and avoid damage to the chips.

[0044] In addition, continue to refer to Figure 4 The first stabilization chip 64, the second stabilization chip 65, the red light driver circuit 61, the green light driver circuit 62, and the blue light driver circuit 63 are hardware-integrated into a single module. Within this module, the first stabilization chip 64 and the red light driver circuit 61 are connected via a bus that transmits the level-converted red light display data signal, the clock signal CLK, the latch signal LAT, and the enable signal OE. One end of the second stabilization chip 65 is connected to one end of another bus, the other end of which is connected to the green light driver circuit 62 and the blue light driver circuit 63, respectively. This bus transmits the display data signal, clock signal CLK, latch signal LAT, and enable signal OE for the green and blue lights. This improves the integration of the LED display and facilitates wiring.

[0045] After setting up the first stabilizing chip 64 and the second stabilizing chip 65, please refer to Figure 6The parallel signals sent by the control system 70 are transmitted to the buffer module 80, and then output to the first stabilization chip 64 and the second stabilization chip 65 respectively via the second buffer chip 82 of the buffer module 80. The parallel signals transmitted to the first stabilization chip 64 are further transmitted to the red light driving circuit 61, and the parallel signals transmitted to the second stabilization chip 65 are further transmitted to the green light driving circuit 62 or the blue light driving circuit 63. Furthermore, the parallel signals sent by the control system 70 to the control circuit 50 are also transmitted to the buffer module 80, and then output to the first stabilization chip 64 and the second stabilization chip 65 respectively via the second buffer chip 82 of the buffer module 80. From the first stabilization chip 64 and the second stabilization chip 65, they are then transmitted to the control circuit 50.

[0046] The main function of the first stabilizing chip 64 and the second stabilizing chip 65 is to manage the parallel signal levels, realize stable signal transmission in the floating ground condition, and improve the anti-interference ability. In addition, the first stabilizing chip 64 can also protect the chip of the red light driving circuit 61, and the second stabilizing circuit can also protect the chip of the green light 42 blue light driving circuit 63 and the chip of the blue light driving circuit 63. From the perspective of the first stabilizing chip 64 and the red light driving circuit 61, using the first voltage for power supply, there is no need to set a voltage dividing resistor, which reduces the design difficulty and material cost; and makes the temperature difference of the entire display module more uniform, and improves the display brightness of the LED display. According to experimental test statistics, the brightness can be increased by about 15%.

[0047] Optionally, a floating ground anti-interference circuit may be provided, which is connected between the first stabilization chip 64 and the red light driving circuit 61. This arrangement achieves the purpose of utilizing the floating ground generated in the circuit through the anti-interference circuit.

[0048] In another embodiment, please refer to Figure 5 The display module also includes a data acquisition circuit 90 connected between the first port 22 and the light-emitting element 40. The data acquisition circuit 90 is used to collect performance parameters of the light-emitting element 40, including temperature, current, voltage, and brightness. Furthermore, the data acquisition circuit 90 can be connected to a memory device to store the collected temperature, current, voltage, and brightness information. Researchers can then analyze the performance parameters stored in the memory device to confirm whether the various performance parameters of the light-emitting element 40 are normal. If not, they can further determine the deviation value, etc., to facilitate further adjustments and repairs.

[0049] Finally, it should be emphasized that the control port, the control circuit 50, the first buffer chip 81, the second buffer chip 82, the first stabilization chip 64, the second stabilization chip 65, the red light driving circuit 61, the green light driving circuit 62 and the blue light driving circuit 63 can be used respectively. Figure 1Of course, it should be understood by those skilled in the art that the number of the wiring terminals 21 can be increased or decreased according to actual needs, and the examples in the application are only examples and are not limiting.

[0050] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A negative voltage dual voltage power supply driven LED display, characterized in that: include: A power interface and a display module; the power interface includes a first electrode, a second electrode and a third electrode; The display module includes a bottom plate, the bottom plate is provided with a connection terminal, and the connection terminal is provided with a first port, a second port and a third port; The first electrode is connected to the first port via a first wiring harness, the second electrode is connected to the second port via a second wiring harness, and the third electrode is connected to the third port via a third wiring harness; a potential difference between the first electrode and the second electrode provides a first voltage, and a potential difference between the first electrode and the third electrode provides a second voltage, and the first voltage and the second voltage are used to power the display module; Providing the first voltage and the second voltage to the display module through the first wiring harness, the second wiring harness, and the third wiring harness; The first electrode is a cathode, the second electrode and the third electrode are cathodes; the first voltage is a first negative voltage, and the second voltage is a second negative voltage; The display module further includes: a light-emitting element, a control circuit, and a drive circuit; the drive circuit is connected to the cathode of the light-emitting element, and the control circuit is connected to the anode of the light-emitting element; the first negative voltage or the second negative voltage is used to power the drive circuit; the second negative voltage is used to power the control circuit; after the control circuit receives a control instruction and the drive circuit receives a drive instruction and drives, the light-emitting element emits light; The display screen further includes: a control port; the control port is connected to the control circuit and the drive circuit respectively, and the second negative voltage is used to power the control port; the control port is used to send control instructions to the control circuit and send drive instructions to the drive circuit; The display module also includes a buffer module, which includes a first buffer chip and a second buffer chip; the control port, the first buffer chip, the second buffer chip and the drive circuit are connected in sequence; the second negative voltage supplies power to the first buffer chip, and the first negative voltage supplies power to the second buffer chip.

2. The LED display screen according to claim 1, characterized in that: The buffer module further includes: a level conversion circuit; The level conversion circuit is connected between the first buffer chip and the second buffer chip.

3. The LED display screen according to claim 1, characterized in that: The display module further includes: an acquisition circuit; The acquisition circuit is connected between the first port and the light-emitting component; the acquisition circuit is used to acquire performance parameters of the light-emitting component.

4. The LED display screen according to claim 3, characterized in that: The light emitting element includes a red light, a green light and a blue light; the driving circuit includes a first driving circuit, a second driving circuit and a third driving circuit; The first drive circuit is connected to the cathode of the red light, the second drive circuit is connected to the cathode of the green light, and the third drive circuit is connected to the cathode of the blue light; The first negative voltage supplies power to the first driving circuit, and the second negative voltage supplies power to the second driving circuit and the third driving circuit.

5. The LED display screen according to claim 4, characterized in that: The display module further includes: a first stabilization chip and a second stabilization chip; The first stabilizing chip is connected between the second buffer chip and the first driving circuit; one end of the second stabilizing chip is connected to the second buffer chip, and the other end is connected to the second driving circuit and the third driving circuit respectively; the first negative voltage is used to power the first stabilizing chip, and the second negative voltage is used to power the second stabilizing chip.

6. The LED display screen according to any one of claims 1 to 5, characterized in that: The first voltage takes a value within a first setting range, and the second voltage takes a value within a second setting range.

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