Driving circuit for display screen and display screen
By combining the power supply module, constant current drive module, and control module, precise current and voltage control of red, green, and blue LEDs is achieved, simplifying PCB design, reducing production costs, and improving system stability. This solves the problem of traditional LED driver circuits operating at high resolution and low power consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN LEYARD OPTO ELECTRONICS
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional LED display driver circuits face challenges such as high design complexity, increased costs, and system instability when pursuing high resolution and low power consumption. In particular, when dealing with red LEDs, power consumption increases significantly, making optimization difficult.
The system employs a combined design of a power supply module, a constant current drive module, and a control module. By adjusting the reference potential of the constant current drive module through the control module, it ensures that the current and total supply voltage of the red LED are within a preset range, while the current and supply voltage of the green and blue LEDs are also within preset thresholds, thus achieving precise current and voltage control.
It simplifies PCB design, reduces production costs, improves system stability and energy efficiency, and solves the problems of high design difficulty and poor energy efficiency of LED driver circuits.
Smart Images
Figure CN224501466U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of LED display technology, and more specifically, to a driving circuit for a display screen and a display screen. Background Technology
[0002] In the field of LED display technology, circuit design faces continuous challenges, especially with the trend towards higher resolution and lower power consumption. While traditional dual-row common-anode circuit architectures can meet basic display requirements, as LED pitch shrinks to below P8, the resulting PCB routing complexity increases significantly. This not only raises design difficulty but also directly increases production costs. Furthermore, dual negative-voltage common-cathode / common-anode designs suffer from stability issues, hindering broader optimization and innovation.
[0003] Current solutions, in their pursuit of a balance between efficiency and cost, often sacrifice one aspect: either accepting higher costs and power consumption for a simpler design, or bearing the risks of design complexity and system instability in order to reduce costs. This is particularly true when dealing with red LEDs, whose unique driving requirements present a critical technical challenge: how to reduce power consumption without adding extra design overhead.
[0004] There is currently no effective solution to the above problems. Utility Model Content
[0005] The main objective of this utility model embodiment is to provide a driving circuit for a display screen and a display screen, so as to at least solve the technical problems of high difficulty in designing LED driving circuits and poor energy efficiency.
[0006] To achieve the above objectives, this utility model provides a driving circuit for a display screen, comprising: a power supply module, a first constant current driving module, and a control module. The output terminal of the power supply module is connected to the anode of a red LED to provide voltage to the red LED. The power supply terminal of the first constant current driving module is connected to the output terminal of the power supply module, and the output terminal of the first constant current driving module is connected to the cathode of the red LED to control the current flowing through the red LED to maintain within a first preset current range. The input terminal of the control module is connected to the output terminal of the power supply module, and the first reference potential output terminal of the control module is connected to the ground terminal of the first constant current driving module to control the total supply voltage of the red LED and the first constant current driving module to maintain within a first preset voltage threshold.
[0007] Optionally, the first preset voltage threshold is less than the output voltage of the power supply module.
[0008] Optionally, the circuit further includes: a second constant current driving module, wherein the output terminal of the power supply module is connected to the anode of the green LED and the anode of the blue LED respectively, for providing voltage to the green LED and the blue LED; the power supply terminal of the second constant current driving module is connected to the output terminal of the power supply module, and the output terminal of the second constant current driving module is connected to the cathode of the green LED and the cathode of the blue LED respectively, for controlling the current flowing through the green LED and the blue LED to be maintained within a second preset current range; the second reference potential output terminal of the control module is connected to the ground terminal of the second constant current driving module, for controlling the total supply voltage of the green LED and the second constant current driving module, and the total supply voltage of the blue LED and the second constant current driving module to be maintained at a second preset voltage threshold.
[0009] Optionally, the difference between the second preset voltage threshold and the output voltage of the power module is less than a preset difference range.
[0010] Optionally, the second constant current driving module includes a first constant current driving unit and a second constant current driving unit, wherein the first constant current driving unit is connected to the cathode of the green light-emitting diode (LED) and is used to control the current flowing through the green LED to be maintained within a third preset current range; the second constant current driving unit is connected to the cathode of the blue LED and is used to control the current flowing through the blue LED to be maintained within a fourth preset current range; the second reference potential output terminal of the control module is connected to the ground terminal of the first constant current driving unit and is used to control the total supply voltage of the green LED and the first constant current driving unit to be maintained within a second preset voltage threshold; the second reference potential output terminal of the control module is connected to the ground terminal of the second constant current driving unit and is used to control the total supply voltage of the blue LED and the second constant current driving unit to be maintained within a second preset voltage threshold.
[0011] Optionally, the first constant current drive module, the first constant current drive unit, and the second constant current drive unit are all MBI5026 constant current drive chips.
[0012] Optionally, the circuit further includes a line module, wherein the input terminal of the line module is connected to the output terminal of the power supply module, and the output terminal of the line module is connected to the anode of the red LED, the anode of the green LED, and the anode of the blue LED, respectively, for controlling the turning on and off of the red LED, the green LED, and the blue LED.
[0013] Optionally, the line module is an APM4953 motor driver chip.
[0014] Optionally, the control module is a PMIC power management integrated circuit, which includes a comparator, a voltage regulator, and a voltage converter.
[0015] According to another aspect of the present invention, a display screen is also provided, comprising: a red light-emitting diode, a green light-emitting diode, a blue light-emitting diode, and a driving circuit for the display screen of any one of the above.
[0016] In this embodiment of the invention, a driving circuit for a display screen includes a power supply module, a first constant current driving module, and a control module. The output terminal of the power supply module is connected to the anode of a red LED to provide voltage to the red LED. The power supply terminal of the first constant current driving module is connected to its output terminal, and its output terminal is connected to the cathode of the red LED to control the current flowing through the red LED within a first preset current range. The input terminal of the control module is connected to the output terminal of the power supply module, and the first reference potential output terminal of the control module is connected to the ground terminal of the first constant current driving module to control the total power supply voltage of the red LED and the first constant current driving module to remain within a first preset voltage threshold. This effectively reduces the total power consumption of the red LED, thereby achieving the technical effect of optimizing PCB design difficulty and improving system stability while ensuring energy saving. This solves the current technical problems of high design difficulty and poor energy efficiency in LED driving circuits. Attached Figure Description
[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0018] Figure 1 This is a structural block diagram of a driving circuit for a display screen according to an embodiment of the present utility model;
[0019] Figure 2 This is a schematic diagram of the circuit structure of an optional dual-reference potential driving circuit according to an embodiment of the present utility model;
[0020] Figure 3 This is a block diagram of an optional driving circuit including three types of diodes according to an embodiment of the present utility model;
[0021] Figure 4 This is a structural block diagram of an optional diode-driven driving circuit according to an embodiment of the present utility model;
[0022] Figure 5 This is a structural block diagram of an optional driving circuit including a row line module according to an embodiment of the present utility model.
[0023] The above figures include the following reference numerals:
[0024] 1. Power supply module; 2. First constant current drive module; 3. Control module; 4. Second constant current drive module; 5. Linear module; 41. First constant current drive unit; 42. Second constant current drive unit; 101. Red light-emitting diode; 102. Green light-emitting diode; 103. Blue light-emitting diode. Detailed Implementation
[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0028] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.
[0029] In the pursuit of high-resolution displays, the traditional dual-row common-anode circuit architecture leads to a dramatic increase in the number of traces on the PCB (printed circuit board), making circuit design exceptionally complex and significantly increasing production costs and design barriers. Simultaneously, the system stability of dual negative-voltage common-cathode or common-anode designs is low, making it difficult to fully meet the high-performance and low-power consumption requirements of displays, especially posing a significant challenge when dealing with red LEDs. Compared to other colors, red LEDs typically require a lower rated voltage. Under a common-anode design, when the current remains constant, the total power consumption of red LEDs also increases significantly, posing a major obstacle for modern displays that prioritize energy efficiency.
[0030] Therefore, this utility model proposes a simple and stable driving circuit for a display screen that ensures energy saving. Figure 1This is a structural block diagram of a driving circuit for a display screen according to an embodiment of the present invention, such as... Figure 1 As shown, the driving circuit for the display screen includes: a power supply module 1, a first constant current driving module 2, and a control module 3. The output terminal of the power supply module 1 is connected to the anode of the red light-emitting diode 101 to provide voltage to the red light-emitting diode 101. The power supply terminal of the first constant current driving module 2 is connected to the output terminal of the power supply module 1, and the output terminal of the first constant current driving module 2 is connected to the cathode of the red light-emitting diode 101 to control the current flowing through the red light-emitting diode 101 to maintain within a first preset current range. The input terminal of the control module 3 is connected to the output terminal of the power supply module 1, and the first reference potential output terminal of the control module 3 is connected to the ground terminal of the first constant current driving module 2 to control the total supply voltage of the red light-emitting diode 101 and the first constant current driving module 2 to maintain within a first preset voltage threshold.
[0031] As the power source for the entire circuit, power module 1 is responsible for providing the necessary voltage to the red LED 101. The output terminal of power module 1 is directly connected to the anode of the red LED 101, ensuring that the LED receives sufficient power to drive it. The first constant current drive module 2 plays a crucial role in controlling the current flowing through the LED. In the circuit, the power supply terminal of the first constant current drive module 2 is connected to the output terminal of power module 1, while its output terminal is connected to the cathode of the red LED 101. In this way, the first constant current drive module 2 ensures that the current flowing through the red LED 101 is maintained within a first preset current range. This range is set according to the physical characteristics of the LED and display requirements to achieve optimal luminous effect and extend the LED's lifespan. The input terminal of control module 3 is connected to the output terminal of power module 1, enabling it to receive voltage from power module 1. More importantly, its first reference potential output terminal is connected to the ground terminal of the first constant current drive module 2, allowing the control module to adjust the reference potential of the first constant current drive module 2, thereby controlling the total supply voltage of the red LED 101 and the first constant current drive module 2, ensuring that this voltage value remains at the first preset voltage threshold. The setting of the first preset voltage threshold is based on the power consumption characteristics of the red LED 101 under different voltages, aiming to achieve minimum power consumption while maintaining normal LED illumination, thereby achieving energy saving. Through the above design, the power supply module 1, the first constant current drive module 2, and the control module 3 work together, which not only simplifies the circuit design, reduces the complexity of PCB wiring, and lowers production costs, but also improves the energy efficiency of the display screen and reduces the additional power consumption of the red LED caused by high-voltage driving.
[0032] The driving circuit for the display screen includes a power supply module 1, a first constant current driving module 2, and a control module 3. The output terminal of the power supply module 1 is connected to the anode of a red LED 101 to provide voltage to the red LED 101. The power supply terminal of the first constant current driving module 2 is connected to the output terminal of the power supply module 1, and the output terminal of the first constant current driving module 2 is connected to the cathode of the red LED 101 to control the current flowing through the red LED 101 and maintain it within a first preset current range. The input terminal of the control module 3 is connected to the output terminal of the power supply module 1, and the first reference potential output terminal of the control module 3 is connected to the ground terminal of the first constant current driving module 2 to control the total supply voltage of the red LED 101 and the first constant current driving module 2 to maintain it within a first preset voltage threshold. This effectively reduces the total power consumption of the red LED, thereby achieving the technical effect of optimizing PCB design difficulty and improving system stability while ensuring energy saving. This solves the current technical problems of high design difficulty and poor energy efficiency in LED driving circuits.
[0033] As an optional embodiment, the first preset voltage threshold is less than the output voltage of the power supply module 1.
[0034] Optionally, in traditional driver circuit designs, power module 1 directly provides the required voltage to the LED, which is often relatively high to ensure that the LED can emit light normally under various operating conditions. However, for red LEDs, the higher voltage of their driver circuit leads to a significant increase in total power consumption under the same current conditions, especially when pursuing high-resolution displays, this problem becomes more prominent due to the dramatic increase in the number of LEDs. Therefore, a control module 3 can be introduced, and a first preset voltage threshold can be set. This threshold is carefully calculated based on the characteristics of the red LED and display requirements, and is lower than the voltage directly output by power module 1. Specifically, the first reference potential output terminal of control module 3 is connected to the ground terminal of the first constant current driver module 2. By adjusting the reference potential of the first constant current driver module 2, the voltage of the red LED driver circuit is made lower than the output voltage of power module 1, allowing stable light emission at a lower voltage without affecting its brightness or lifespan, thus reducing unnecessary power consumption.
[0035] For example, Figure 2 This is a schematic diagram of an optional dual-reference potential driving circuit according to an embodiment of the present invention. Figure 2As shown, GND1 is the reference potential for the red LED driver chip, and GND2 is the reference potential for the green and blue LED driver chips. The voltage of GND2 is 0.6V higher than that of GND1. Pin 1 of UR (red LED driver chip) is connected to GND2, while pin 1 of UG and UB (other color LED driver chips) is connected to GND1. The control module POWER1 ensures that the current flowing through the red LED is within a first preset current range by reducing the voltage in the red LED driver circuit, while maintaining the total supply voltage at a first preset voltage threshold. This threshold is less than the voltage directly output by the power supply, but sufficient to meet the normal operating requirements of the red LED, thereby significantly reducing power consumption while ensuring LED brightness.
[0036] As an optional embodiment, the circuit further includes: a second constant current driving module 4, wherein the output terminal of the power supply module 1 is connected to the anode of the green LED 102 and the anode of the blue LED 103, respectively, for providing voltage to the green LED 102 and the blue LED 103; the power supply terminal of the second constant current driving module 4 is connected to the output terminal of the power supply module 1, and the output terminal of the second constant current driving module 4 is connected to the cathode of the green LED 102 and the cathode of the blue LED 103, respectively, for controlling the current flowing through the green LED 102 and the blue LED 103 to be maintained within a second preset current range; the second reference potential output terminal of the control module 3 is connected to the ground terminal of the second constant current driving module 4, for controlling the total supply voltage of the green LED 102 and the second constant current driving module 4, and the total supply voltage of the blue LED 103 and the second constant current driving module 4 to be maintained within a second preset voltage threshold.
[0037] Optionally, Figure 3 This is a block diagram of an optional driving circuit including three types of diodes according to an embodiment of the present invention. Figure 3As shown, the second constant current drive module 4 is used to control the current of the green LED 102 and the blue LED 103, ensuring they operate at optimal brightness while reducing unnecessary power consumption. Specifically, the output terminal of the power supply module 1 is connected to the anodes of the green LED 102 and the blue LED 103, respectively, providing them with the required voltage. The power supply terminal of the second constant current drive module 4 is also connected to the output terminal of the power supply module 1, and its output terminal is connected to the cathodes of the green LED 102 and the blue LED 103, respectively. In this way, the second constant current drive module 4 can finely adjust the current flowing through the green LED 102 and the blue LED 103, ensuring it remains within a second preset current range, which is also set based on the analysis of LED characteristics and display requirements. To further optimize the voltage control of the green LED 102 and the blue LED 103, the second reference potential output terminal of the control module 3 is connected to the ground terminal of the second constant current drive module 4. Through the intelligent adjustment of the control module, the total power supply voltage of the green LED 102 and the blue LED 103 and the second constant current drive module 4 can be precisely controlled and maintained at the second preset voltage threshold, which is usually the voltage output by the power supply module 1, which is sufficient to ensure the stable operation of the green and blue LEDs at the predetermined brightness.
[0038] As an optional embodiment, the difference between the second preset voltage threshold and the output voltage of the power module 1 is less than a preset difference range.
[0039] Optionally, the second preset voltage threshold is the ideal operating voltage for the green and blue LEDs, typically equal to the voltage directly output by power supply module 1, meaning the difference between it and the voltage directly output by power supply module 1 is less than a preset range. By connecting the second reference potential output terminal of control module 3 to the ground terminal of the second constant current drive module 4, the actual supply voltage of the green and blue LEDs can be adjusted to maintain them at the second preset voltage threshold, thereby ensuring they operate at optimal power consumption and brightness.
[0040] As an optional embodiment, the second constant current driving module 4 includes a first constant current driving unit 41 and a second constant current driving unit 42. The first constant current driving unit 41 is connected to the cathode of the green light-emitting diode 102 and is used to control the current flowing through the green light-emitting diode 102 to be maintained within a third preset current range. The second constant current driving unit 42 is connected to the cathode of the blue light-emitting diode 103 and is used to control the current flowing through the blue light-emitting diode 103 to be maintained within a fourth preset current range. The second reference potential output terminal of the control module 3 is connected to the ground terminal of the first constant current driving unit 41 and is used to control the total supply voltage of the green light-emitting diode 102 and the first constant current driving unit 41 to be maintained within a second preset voltage threshold. The second reference potential output terminal of the control module 3 is connected to the ground terminal of the second constant current driving unit 42 and is used to control the total supply voltage of the blue light-emitting diode 103 and the second constant current driving unit 42 to be maintained within a second preset voltage threshold.
[0041] Optionally, Figure 4 This is a structural block diagram of an optional diode-driven driving circuit according to an embodiment of the present invention. Figure 4 As shown, the second constant current driving module is further subdivided into a first constant current driving unit 41 and a second constant current driving unit 42. This design aims to provide more precise and independent current control for the green and blue light-emitting diodes (LEDs), thereby optimizing their luminous efficiency and overall display performance. The first constant current driving unit 41 is directly connected to the cathode of the green LED 102, and its task is to ensure that the current flowing through the green LED is maintained within a third preset current range. The second constant current driving unit 42 is connected to the cathode of the blue LED 103 and is responsible for controlling the current flowing through the blue LED, ensuring that it is maintained within a fourth preset current range. The second reference potential output terminal of the control module 3 is connected to the ground terminals of the first constant current driving unit 41 and the second constant current driving unit 42, respectively, realizing independent voltage control of the green and blue LEDs. By adjusting the second reference potential, the control module can control the actual supply voltage of the green and blue LEDs respectively, so that they are each maintained at a second preset voltage threshold, satisfying the optimal luminous conditions of the green and blue LEDs.
[0042] As an optional embodiment, the first constant current driving module 2, the first constant current driving unit 41, and the second constant current driving unit 42 are all MBI5026 type constant current driving chips.
[0043] Optionally, such as Figure 2As shown, the MBI5026 is a high-performance constant current driver chip widely used in the LED display industry. It is favored for its precise current control, excellent temperature characteristics, and low power consumption. This chip can adapt to different voltage environments while ensuring that the current flowing through the LED remains stable at a preset value, significantly positively impacting the LED's brightness, color consistency, and lifespan.
[0044] As an optional embodiment, the circuit further includes: a line module 5, wherein the input terminal of the line module 5 is connected to the output terminal of the power module 1, and the output terminal of the line module 5 is connected to the anode of the red light-emitting diode 101, the anode of the green light-emitting diode 102, and the anode of the blue light-emitting diode 103, respectively, for controlling the opening and closing of the red light-emitting diode 101, the green light-emitting diode 102, and the blue light-emitting diode 103.
[0045] Optionally, Figure 5 This is a structural block diagram of an optional driving circuit including a row line module, provided according to an embodiment of the present utility model. For example... Figure 5 As shown, the output terminals of the row line module 5 are connected to the anodes of the red LED 101, green LED 102, and blue LED 103, respectively. This design is to achieve individual control of each row of LEDs. In LED displays, the row line module is typically used to scan and select which row of LEDs should be lit. This is achieved through electronic switches (such as switches within transistors or integrated circuits), which are controlled by the row line module to turn on and off sequentially, thereby forming the image on the display screen.
[0046] As an optional embodiment, the line module 5 is an APM4953 motor driver chip.
[0047] Optionally, such as Figure 2 As shown, the APM4953 is a motor driver chip and the core component of the row line module 5. It is used to drive the row lines of the LED display screen, enabling precise control of the red, green, and blue light-emitting diodes. The APM4953's powerful current control capabilities and multi-channel output characteristics make it suitable for LED driving tasks, especially for applications requiring high-precision current management and synchronization control.
[0048] As an optional embodiment, the control module 3 is a PMIC power management integrated circuit, wherein the PMIC power management integrated circuit includes a comparator, a voltage regulator and a voltage converter.
[0049] Optionally, control module 3 is a core component that uses a PMIC (Power Management IC) as its basic architecture. A PMIC is a highly integrated power control chip responsible for managing and distributing voltage from the power module, ensuring stable and efficient operation of all components in the system. The PMIC's components, such as comparators, regulators, and voltage converters, work together to achieve comprehensive control and optimization of the entire LED driving circuit. By detecting voltage status through comparators, ensuring voltage stability through regulators, and providing precise voltage adjustment through voltage converters, control module 3 can provide optimal driving conditions for various LEDs in complex and variable operating environments, while reducing power consumption and improving the overall performance and reliability of the system.
[0050] This utility model embodiment also provides a display screen, including: a red light-emitting diode 101, a green light-emitting diode 102, a blue light-emitting diode 103, and any one of the above-mentioned driving circuits for the display screen.
[0051] Optionally, the display screen in this optional embodiment is a high-performance display device integrating a red light-emitting diode 101, a green light-emitting diode 102, a blue light-emitting diode 103, and an innovatively designed driving circuit. This display screen is designed with full consideration of color display accuracy and system energy efficiency optimization. By employing specialized driving circuit technology, it can independently and precisely control the current and voltage of each color LED. The innovative driving circuit utilizes a dual-reference potential system, which not only significantly reduces the complexity and cost of PCB design but also significantly improves the system stability and performance of the LED display screen.
[0052] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.
[0053] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.
[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0055] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.
[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A driving circuit for a display screen, characterized in that, include: The power supply module (1), the first constant current drive module (2), and the control module (3) are, among which, The output terminal of the power module (1) is connected to the anode of the red light-emitting diode (101) to provide voltage to the red light-emitting diode (101); The power supply terminal of the first constant current driving module (2) is connected to the output terminal of the power supply module (1), and the output terminal of the first constant current driving module (2) is connected to the cathode of the red light-emitting diode (101) to control the current flowing through the red light-emitting diode (101) to maintain within a first preset current range. The input terminal of the control module (3) is connected to the output terminal of the power supply module (1), and the first reference potential output terminal of the control module (3) is connected to the ground terminal of the first constant current drive module (2) to control the total power supply voltage of the red light-emitting diode (101) and the first constant current drive module (2) to be maintained at the first preset voltage threshold.
2. The circuit according to claim 1, characterized in that, The first preset voltage threshold is less than the output voltage of the power module (1).
3. The circuit according to claim 1, characterized in that, Also includes: The second constant current drive module (4), wherein, The output terminal of the power module (1) is connected to the anode of the green light-emitting diode (102) and the anode of the blue light-emitting diode (103) respectively, and is used to provide voltage to the green light-emitting diode (102) and the blue light-emitting diode (103); The power supply terminal of the second constant current driving module (4) is connected to the output terminal of the power supply module (1), and the output terminal of the second constant current driving module (4) is connected to the cathode of the green light-emitting diode (102) and the cathode of the blue light-emitting diode (103) respectively, for controlling the current flowing through the green light-emitting diode (102) and the blue light-emitting diode (103) to be maintained within the second preset current range. The second reference potential output terminal of the control module (3) is connected to the ground terminal of the second constant current drive module (4) to control the total power supply voltage of the green light-emitting diode (102) and the second constant current drive module (4), and the total power supply voltage of the blue light-emitting diode (103) and the second constant current drive module (4) to be maintained at the second preset voltage threshold.
4. The circuit according to claim 3, characterized in that, The difference between the second preset voltage threshold and the output voltage of the power module (1) is less than the preset difference range.
5. The circuit according to claim 3, characterized in that, The second constant current drive module (4) includes a first constant current drive unit (41) and a second constant current drive unit (42), wherein, The first constant current driving unit (41) is connected to the cathode of the green light-emitting diode (102) and is used to control the current flowing through the green light-emitting diode (102) to be maintained within a third preset current range; The second constant current driving unit (42) is connected to the cathode of the blue light-emitting diode (103) and is used to control the current flowing through the blue light-emitting diode (103) to be maintained within a fourth preset current range; The second reference potential output terminal of the control module (3) is connected to the ground terminal of the first constant current driving unit (41) to control the total power supply voltage of the green light-emitting diode (102) and the first constant current driving unit (41) to be maintained at the second preset voltage threshold. The second reference potential output terminal of the control module (3) is connected to the ground terminal of the second constant current driving unit (42) to control the total power supply voltage of the blue light-emitting diode (103) and the second constant current driving unit (42) to be maintained at the second preset voltage threshold.
6. The circuit according to claim 5, characterized in that, The first constant current driving module (2), the first constant current driving unit (41) and the second constant current driving unit (42) are all MBI5026 constant current driving chips.
7. The circuit according to claim 3, characterized in that, Also includes: Line module (5), wherein, The input terminal of the line module (5) is connected to the output terminal of the power module (1), and the output terminal of the line module (5) is connected to the anode of the red light-emitting diode (101), the anode of the green light-emitting diode (102), and the anode of the blue light-emitting diode (103) respectively, for controlling the opening and closing of the red light-emitting diode (101), the green light-emitting diode (102), and the blue light-emitting diode (103).
8. The circuit according to claim 7, characterized in that, The line module (5) is an APM4953 motor driver chip.
9. The circuit according to claim 1, characterized in that, The control module (3) is a PMIC power management integrated circuit, wherein the PMIC power management integrated circuit includes a comparator, a voltage regulator and a voltage converter.
10. A display screen, characterized in that, It includes a red light-emitting diode (101), a green light-emitting diode (102), a blue light-emitting diode (103), and a driving circuit for a display screen according to any one of claims 1 to 9.