LED drive circuit, LED display module and LED display screen

Abstract

The utility model relates to an LED drive circuit, an LED display module and an LED display screen. The LED driving circuit comprises a digital circuit and an analog circuit, and the cathode power supply end of the digital circuit is connected to the second power supply port; the negative power supply end of the analog circuit is connected to a target power supply port; wherein the number of the negative power supply ends of the analog circuit is the same as that of the target power supply ports; the target power supply port is a first power supply port, or the target power supply port is the first power supply port and a second power supply port; the first access voltage of the first power supply port is greater than or equal to the second access voltage of the second power supply port; the target power supply port is used for accessing a target voltage, so that the analog circuit provides a cathode voltage for an external LED of the LED driving circuit based on the target voltage; and the second access voltage of the second power supply port is used for providing the negative electrode voltage for the digital circuit, so that the digital circuit works normally, unnecessary power consumption is effectively reduced, and the reliability and applicability of the LED driving circuit are improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to an LED driver circuit, an LED display module, and an LED display screen. Background Technology

[0002] In existing LED display technology, a single voltage is typically used to power all types of LEDs (such as red, green, and blue LEDs). Since LEDs of different colors have different on-state voltage drop characteristics—for example, the on-state voltage drop of red LEDs is approximately 2-3V, while that of green and blue LEDs is higher, approximately 3-4V—LED displays usually choose a higher supply voltage, such as 5V, to ensure that all LEDs can operate normally. However, this setup results in an excessively high supply voltage for red LEDs, which have lower on-state voltage drops, causing their driver circuits to withstand a significant voltage drop, thus increasing unnecessary power consumption.

[0003] There is currently no effective solution to the problem that using a single voltage to power all types of LEDs in existing technologies leads to excessive power consumption in some driving circuits. Utility Model Content

[0004] Therefore, it is necessary to provide an LED driver circuit, an LED display module, and an LED display screen to address the aforementioned technical problems.

[0005] In a first aspect, this application provides an LED driving circuit, which includes a digital circuit and an analog circuit, the digital circuit and the analog circuit are connected, and the LED driving circuit is provided with a first power supply port and a second power supply port.

[0006] The negative power supply terminal of the digital circuit is connected to the second power supply port;

[0007] The negative power supply terminal of the analog circuit is connected to the target power supply port; wherein, the number of negative power supply terminals of the analog circuit is the same as the number of target power supply ports; the target power supply port is a first power supply port, or, the target power supply port is the first power supply port and the second power supply port; the first access voltage of the first power supply port is greater than or equal to the second access voltage of the second power supply port;

[0008] The target power supply port is used to connect to the target voltage so that the analog circuit provides a negative voltage to the LED connected to the LED driver circuit based on the target voltage; the second access voltage of the second power supply port is used to provide a negative voltage to the digital circuit so that the digital circuit can operate normally.

[0009] In one embodiment, when the target power supply port is a first power supply port, the target voltage is the first access voltage;

[0010] The first access voltage is used to provide a negative voltage to the first LED connected to the LED driving circuit so that the first LED can work normally; the second access voltage is used to provide a negative voltage to the digital circuit so that the digital circuit can work normally.

[0011] In one embodiment, the first LED refers to any one of LEDs with different on-state voltage drops.

[0012] In one embodiment, when the target power supply port is a first power supply port and a second power supply port, the target voltage is the first access voltage and the second access voltage;

[0013] The first access voltage is used to provide a negative voltage to the second LED connected to the LED driving circuit so that the second LED can work normally; the second access voltage is used to provide a negative voltage to the third LED connected to the LED driving circuit and the digital circuit so that the third LED and the digital circuit can work normally.

[0014] In one embodiment, the on-state voltage drop of the second LED is less than that of the third LED.

[0015] In one embodiment, the LED driving circuit further includes a third power supply port;

[0016] The positive power supply terminal of the digital circuit is connected to the third power supply port; the positive power supply terminal of the analog circuit is also connected to the third power supply port.

[0017] The third access voltage of the third power supply port is used to provide a positive voltage to the digital circuit and the analog circuit.

[0018] In one embodiment, the LED driving circuit further includes n constant current output ports; the analog circuit includes n constant current sources; n≥1;

[0019] The output terminal of the constant current source is connected to the constant current output port in a one-to-one correspondence.

[0020] The constant current output port is used to connect to the LED and provide drive current to the LED.

[0021] In one embodiment, the LED driving circuit further includes at least one communication port; the digital circuit includes a drive controller;

[0022] The communication terminal of the drive controller is connected to the communication port of the LED drive circuit in a one-to-one correspondence.

[0023] The drive controller is used to generate a drive control signal based on the display control data received from the communication terminal, and to perform display control on the LEDs connected to the LED drive circuit based on the drive control signal.

[0024] Secondly, this application also provides an LED display module, which includes M LED driving circuits as described in any of the embodiments of the first aspect above, and LEDs corresponding to the M LED driving circuits; M≥1.

[0025] In one embodiment, the LED driving circuit has a first power supply port, a second power supply port, and n constant current output ports; n≥1; the LED display module includes M×n×k LEDs; k≥1;

[0026] For each of the M LED driving circuits, the first power supply port of each LED driving circuit is connected to a first external power supply or a second external power supply; the second power supply port of each LED driving circuit is connected to the second external power supply.

[0027] For each of the n constant current output ports of each LED driving circuit, each constant current output port is connected to the cathode of k LEDs respectively;

[0028] The anodes of the M×n×k LEDs are connected to a third external power source.

[0029] In one embodiment, the first external power source is used to provide a first access voltage to the first power supply port;

[0030] The second external power source is used to provide a second access voltage to the second power supply port;

[0031] The third external power source is used to provide power supply voltage to the M×n×k LEDs;

[0032] Wherein, the power supply voltage is greater than the first access voltage; the first access voltage is greater than or equal to the second access voltage.

[0033] Thirdly, this application also provides an LED display screen, which includes a main control terminal, a first external power supply, a second external power supply, a third external power supply, and at least one LED display module as described in any of the embodiments of the second aspect above;

[0034] The main control terminal is communicatively connected to the LED display module.

[0035] The aforementioned LED driver circuit, LED display module, and LED display screen include a digital driver circuit and an analog circuit, which are connected. The LED driver circuit has a first power supply port and a second power supply port. The negative power supply terminal of the digital circuit is connected to the second power supply port. A negative voltage is provided to the digital circuit through the second access voltage of the second power supply port, ensuring that the digital circuit always operates under the second access voltage to ensure the accuracy of signal analysis. The negative power supply terminal of the analog circuit is connected to a target power supply port. The number of negative power supply terminals of the analog circuit is the same as the number of target power supply ports. The target power supply port is the first power supply port, or the target power supply port is the first power supply port. The system includes a second power supply port; a first access voltage at the first power supply port that is greater than or equal to the second access voltage at the second power supply port; a target power supply port for connecting a target voltage so that the analog circuit provides a negative voltage to the LED connected to the LED driver circuit based on the target voltage; by connecting the negative power supply terminal of the analog circuit to the target power supply port, it is possible to ensure that a corresponding negative voltage is provided for different types of LEDs, thereby ensuring that each type of LED can operate within its most suitable voltage range. This avoids the problem in the prior art of using a single voltage to uniformly power all types of LEDs, resulting in excessive power consumption in some driver circuits, effectively reducing unnecessary power consumption and improving the reliability and applicability of the LED driver circuit. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the LED driver circuit in one embodiment;

[0038] Figure 2 This is a schematic diagram of the LED driver circuit in another embodiment;

[0039] Figure 3 This is a schematic diagram of the structure of an LED display module in one embodiment;

[0040] Figure 4 This is a schematic diagram of the LED display module in another embodiment.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100. LED driver circuit; 110. Digital circuit; 120. Analog circuit. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0044] In one embodiment, such as Figure 1 and Figure 2 As shown, the LED driver circuit 100 includes a digital circuit 110 and an analog circuit 120, which are connected together. The LED driver circuit 100 is provided with a first power supply port gnd1 and a second power supply port gnd2.

[0045] The negative power supply terminal G of digital circuit 110 is connected to the second power supply port gnd2;

[0046] The negative power supply terminal (G1, or G1 and G2) of the analog circuit 120 is connected to the target power supply port; wherein, the number of negative power supply terminals of the analog circuit 120 is the same as the number of target power supply ports; the target power supply port is the first power supply port gnd1, or the target power supply port is the first power supply port gnd1 and the second power supply port gnd2; the first access voltage of the first power supply port gnd1 is greater than or equal to the second access voltage of the second power supply port gnd2;

[0047] The target power supply port is used to connect to the target voltage so that the analog circuit 120 provides a negative voltage to the LED (not shown in the figure) connected to the LED driver circuit 100 based on the target voltage; the second access voltage of the second power supply port gnd2 is used to provide a negative voltage to the digital circuit 110 so that the digital circuit 110 can work normally.

[0048] It should be noted that the digital circuit 110 and the analog circuit 120 are connected by signal lines or control lines to achieve data transmission and synchronous control.

[0049] The digital circuit 110 may include, but is not limited to, a drive controller. The drive controller generates drive control signals based on received display control data and controls the LEDs connected to the LED drive circuit 100 according to these signals. The display control data is generated by the main control unit based on actual display requirements and is not specifically limited here. The drive controller may include, but is not limited to, a communication module, a memory module, and a display processing module. The communication module establishes a communication connection between the LED drive circuit 100 and the main control unit. The memory module stores display control-related data. The display processing module generates drive control signals based on the received display control data and transmits these signals to the analog circuit 120.

[0050] The analog circuit 120 is used to realize the constant current output function of the LED driver circuit 100 according to the drive control signal. The analog circuit 120 may include, but is not limited to, a constant current source. The constant current source is used to provide a stable drive current to the connected LED. The LED may include, but is not limited to, red LEDs, green LEDs, and blue LEDs.

[0051] The first power supply port gnd1 of the LED driver circuit 100 is used to connect to the first access voltage; the second power supply port gnd2 of the LED driver circuit 100 is used to connect to the second access voltage; wherein the first access voltage is greater than or equal to the second access voltage; the first access voltage and the second access voltage need to be adaptively selected according to the actual display requirements of the LED driver circuit 100 and the specific type of LED, and are not specifically limited here.

[0052] It should be noted that the second access voltage needs to ensure a stable negative voltage is provided to the digital circuit 110, thereby ensuring the normal operation of the digital circuit 110 and guaranteeing the accuracy of signal analysis. The first access circuit, on the other hand, needs to be adaptively configured according to the performance of the LED to be connected, to ensure that the most suitable negative voltage is provided to the LED, reducing unnecessary power consumption and avoiding energy waste.

[0053] Understandably, when the LED driver circuit 100 is operating normally, it requires an external power supply to provide corresponding positive and negative voltages to ensure the proper functioning of the internal digital circuit 110 and analog circuit 120. This also ensures that a suitable power supply voltage is provided to the externally connected LEDs, preventing energy waste. The positive voltage needs to be provided by a unified external power supply, while the negative voltage needs to be flexibly configured according to actual requirements; no specific limitations are made here.

[0054] Further, see Figure 1 and Figure 2 The negative power supply terminal of the analog circuit 120 may include, but is not limited to, negative power supply terminal G1, or negative power supply terminal G1 and negative power supply terminal G2; the negative power supply terminal of the analog circuit 120 is connected to the target power supply port; wherein, the number of negative power supply terminals of the analog circuit 120 is the same as the number of target power supply ports; the target power supply port is used to connect a target voltage so that the analog circuit 120 provides a negative voltage to the LED connected to the LED driver circuit 100 based on the target voltage. The target voltage is either a first access voltage, or a first access voltage and a second access voltage.

[0055] In one exemplary embodiment, see Figure 1 When the number of negative power supply terminals of analog circuit 120 is 1, i.e., the negative power supply terminal of analog circuit 120 is G1, the target power supply port is the first power supply port gnd1, and the negative power supply terminal of analog circuit 120, G1, is connected to the first power supply port gnd1. The first power supply port gnd1 is used to connect to a first access voltage, so that analog circuit 120 provides a negative voltage to the LED connected to LED driver circuit 100 based on the first access voltage. The second power supply port gnd2 is used to connect to a second access voltage, so that the second access voltage provides a negative voltage to digital circuit 110, so that digital circuit 110 can work normally. The first access voltage is greater than or equal to the second access voltage.

[0056] Understandably, based on Figure 1 The LED driver circuit 100 in the circuit can achieve driving control of any monochrome LED by selecting a suitable first access voltage, while effectively avoiding energy waste.

[0057] In another exemplary embodiment, see Figure 2When the number of negative power supply terminals of analog circuit 120 is two, i.e., G1 and G2, the target power supply ports are the first power supply port gnd1 and the second power supply port gnd2. Negative power supply terminal G1 of analog circuit 120 is connected to the first power supply port gnd1, and negative power supply terminal G2 of analog circuit 120 is connected to the second power supply port gnd2. The first power supply port gnd1 is used to receive a first input voltage, enabling analog circuit 120 to provide a corresponding negative voltage to the first portion of LEDs connected to LED driver circuit 100 based on the first input voltage. The second power supply port gnd2 is used to receive a second input voltage, providing a negative voltage to digital circuit 110 to ensure normal operation of digital circuit 110, and simultaneously enabling analog circuit 120 to provide a corresponding negative voltage to the second portion of LEDs connected to LED driver circuit 100 based on the second input voltage. The first input voltage is greater than or equal to the second input voltage; the negative voltages of the first portion of LEDs and the second portion of LEDs are isolated from each other.

[0058] Understandably, based on Figure 2 The LED driver circuit 100 in the middle can achieve driving control of any color-mixed LEDs by selecting appropriate first and second access voltages while effectively avoiding energy waste.

[0059] In this embodiment, the negative voltage is provided to the digital circuit 110 through the second access voltage of the second power supply port gnd2, which ensures that the digital circuit 110 always operates under the second access voltage to ensure the accuracy of signal analysis. By connecting the negative power supply terminal of the analog circuit 120 to the target power supply port, it is possible to ensure that the corresponding negative voltage is provided for different types of LEDs, thereby ensuring that each type of LED can operate within its most suitable voltage range. This avoids the problem in the prior art of using a single voltage to supply power to all types of LEDs, which leads to excessive power consumption in some driving circuits. It effectively reduces unnecessary power consumption and improves the reliability and applicability of the LED driving circuit 100.

[0060] In one embodiment, see Figure 1 When the target power supply port is the first power supply port gnd1, the target voltage is the first access voltage;

[0061] The first access voltage is used to provide a negative voltage to the first LED connected to the LED driver circuit 100 so that the first LED can work normally; the second access voltage is used to provide a negative voltage to the digital circuit 110 so that the digital circuit 110 can work normally.

[0062] The first LED refers to any one of LEDs with different on-state voltage drops. For example, the first LED includes any one of red LED, green LED, and blue LED; wherein the on-state voltage drop of the red LED is 2-3V; and the on-state voltage drop of the green LED and the blue LED is 3-4V.

[0063] Understandably, when the target power supply port is the first power supply port gnd1, the LED driver circuit 100 is used to realize the driving control of any monochrome LED.

[0064] Preferably, the LED driver circuit 100 is also provided with a third power supply port vdd;

[0065] The positive power supply terminal V of digital circuit 110 is connected to the third power supply port vdd; the positive power supply terminal V of analog circuit 120 is connected to the third power supply port vdd.

[0066] The third input voltage of the third power supply port Vdd is used to provide a positive voltage to the digital circuit 110 and the analog circuit 120.

[0067] For example, if the first LED is a red LED, then the first input voltage is greater than the second input voltage; assuming the first input voltage is 1.3V, the second input voltage is 0V, and the third input voltage is 5V; the third input voltage of 5V provides a positive voltage to the digital circuit 110 and the analog circuit 120; in practical applications, the analog circuit 120 provides a 1.3V negative voltage to the red LED connected to the LED driver circuit 100 based on the first input voltage of 1.3V, ensuring that the red LED operates within the most suitable voltage range and reducing unnecessary power consumption. Simultaneously, the second input voltage of 0V provides a stable 0V negative voltage to the digital circuit 110, enabling the digital circuit 110 to operate normally and ensuring the accuracy of signal analysis.

[0068] Similarly, if the first LED is a green or blue LED, then the first input voltage is equal to the second input voltage. Assuming the first input voltage is 0V, the second input voltage is 0V, and the third input voltage is 5V, the third input voltage of 5V provides a positive voltage to the digital circuit 110 and the analog circuit 120. In practical applications, the analog circuit 120 provides a 0V negative voltage to the green or blue LED connected to the LED driver circuit 100 based on the first input voltage of 0V, ensuring that the green or blue LED operates within its optimal voltage range. Simultaneously, the second input voltage of 0V provides a stable 0V negative voltage to the digital circuit 110, enabling it to operate normally and ensuring accurate signal interpretation.

[0069] Understandably, regardless of the type of external LED, the LED driver circuit 100 can provide a suitable negative voltage for it, while ensuring a stable supply of the required negative voltage to the digital circuit 110, thereby enhancing the reliability of the digital circuit 110.

[0070] In this embodiment, when the target power supply port is the first power supply port gnd1, based on the target voltage, i.e. the first access voltage, it can ensure that a suitable negative voltage is provided to the first LED connected to the LED driver circuit 100 so that the first LED can work normally. This not only improves the flexibility of the voltage configuration of the LED driver circuit 100, but also effectively reduces unnecessary power consumption and extends the life of the LED. At the same time, by setting the second access voltage, a stable negative voltage support is provided to the digital circuit 110, ensuring the stability and reliability of the operation of the digital circuit 110, thereby improving the performance and signal resolution accuracy of the entire LED driver circuit 100.

[0071] In one embodiment, see Figure 2 When the target power supply ports are the first power supply port gnd1 and the second power supply port gnd2, the target voltage is the first access voltage and the second access voltage.

[0072] The first access voltage is used to provide a negative voltage to the second LED connected to the LED driver circuit 100 so that the second LED can work normally; the second access voltage is used to provide a negative voltage to the third LED connected to the LED driver circuit 100 and the digital circuit 110 so that the third LED and the digital circuit 110 can work normally.

[0073] The on-state voltage drop of the second LED is less than that of the third LED. The second LED includes a red LED; the third LED includes a green LED and / or a blue LED.

[0074] It is understandable that when the negative power supply terminal of analog circuit 120 includes negative power supply terminal G1 and negative power supply terminal G2, the internal structure of analog circuit 120 is divided into two parts, such as... Figure 2 As shown, one part is connected to the negative power supply terminal G1, and the other part is connected to the negative power supply terminal G2, laying the foundation for realizing the mixed-color LED driving control.

[0075] Preferably, the LED driver circuit 100 is also provided with a third power supply port vdd;

[0076] The positive power supply terminal V of digital circuit 110 is connected to the third power supply port vdd; the positive power supply terminal V of analog circuit 120 is connected to the third power supply port vdd.

[0077] The third input voltage of the third power supply port Vdd is used to provide a positive voltage to the digital circuit 110 and the analog circuit 120.

[0078] For example, taking a red LED as the second LED and a green LED as the third LED, with the target power supply ports being the first power supply port gnd1 and the second power supply port gnd2, the target voltages are the first access voltage and the second access voltage; the first access voltage is greater than the second access voltage; assuming the first access voltage is 1.3V, the second access voltage is 0V, and the third access voltage is 5V; the third access voltage of 5V provides a positive voltage to the digital circuit 110 and the analog circuit 120; in practical applications, the analog circuit 120 provides a 1.3V negative voltage to the red LED connected to the LED driver circuit 100 based on the first access voltage of 1.3V, ensuring that the red LED operates within the most suitable voltage range and reducing unnecessary power consumption. Simultaneously, the second access voltage of 0V provides a 0V negative voltage to the digital circuit 110 and the green LED, enabling them to operate normally.

[0079] In this embodiment, when the target power supply ports are the first power supply port gnd1 and the second power supply port gnd2, the target voltages are the first access voltage and the second access voltage. Based on the first access voltage, it can be ensured that a suitable negative voltage is provided to the second LED connected to the LED driver circuit 100 so that the second LED can work normally. Based on the second access voltage, it can be ensured that a suitable negative voltage is provided to the third LED and the digital circuit 110, thereby ensuring the stability and reliability of the operation of the third LED and the digital circuit 110. Based on this, when implementing color mixing LED driving control based on the LED driver circuit 100, unnecessary power consumption can be effectively reduced, the lifespan of the LED can be extended, and the problem of energy waste caused by using a single voltage to uniformly power the color mixing LED in the prior art can be avoided.

[0080] In one embodiment, see Figure 1 or Figure 2 The LED driver circuit 100 also has n constant current output ports (Out 1 to Out n); the analog circuit includes n constant current sources; n≥1; n is a natural number;

[0081] The output terminals of the constant current source are connected one-to-one with the constant current output ports;

[0082] The constant current output port is used to connect to the LED and provide drive current to the LED.

[0083] The constant current source is used to output the corresponding driving current to the LED. It should be noted that the number of constant current sources needs to be set according to the actual display requirements, and no specific limit is made here.

[0084] In one exemplary embodiment, see Figure 1 , Figure 1 The constant current output ports Out1 to Outn of the LED driver circuit 100 are used to connect to the first LED and provide driving current to the first LED. The first LED is any one of a red LED, a green LED, and a blue LED.

[0085] In another exemplary embodiment, see Figure 2 , Figure 2 The constant current output ports Out1 to Outm of the LED driver circuit 100 are used to connect to the second LED and provide driving current to the second LED. The second LED is a red LED. The constant current output ports Outm+1 to Outn of the LED driver circuit 100 are used to connect to the third LED and provide driving current to the third LED. The third LED is a green LED and / or a blue LED.

[0086] In this embodiment, the constant current output port of the LED driver circuit 100 is connected to the LED and provides the corresponding driving current to the LED, laying the foundation for realizing the driving control of the LED.

[0087] In one embodiment, the LED driving circuit 100 is further provided with at least one communication port; the digital circuit 110 includes a driving controller.

[0088] The communication terminal of the drive controller is connected one-to-one with the communication port of the LED driver circuit 100;

[0089] The drive controller is used to generate drive control signals based on the display control data received from the communication terminal, and to perform display control on the LEDs connected to the LED drive circuit 100 based on the drive control signals.

[0090] The communication port of the LED driver circuit 100 is used to realize communication with external devices. These external devices may include, but are not limited to, a main control unit. The main control unit may include, but is not limited to, a control chip. The control chip may be, but is not limited to, a microcontroller unit (MCU). The main control unit is used to send corresponding control commands to the LED driver circuit 100 to control the LED driver circuit 100 to perform corresponding actions. These control commands may include, but are not limited to, scanning signals and preset display control data.

[0091] The drive controller, which may be, but is not limited to, an MCU, is used to generate drive control signals based on the received display control data, and to perform display control on the LEDs connected to the LED drive circuit 100 based on the drive control signals.

[0092] In this embodiment, based on the communication port of the LED driver circuit 100, corresponding display control data can be received. Then, based on the driver controller of the digital circuit 110, corresponding drive control signals are generated according to the received display control data. Based on the drive control signals, the LEDs connected to the LED driver circuit 100 can be accurately controlled, thereby improving the reliability of the LED driver circuit 100.

[0093] In one embodiment, such as Figure 3 or Figure 4 As shown, the LED display module includes M LED driving circuits 100 as described in the above embodiments, and LEDs corresponding to the M LED driving circuits 100; M≥1, where M is a natural number.

[0094] It should be noted that the specific structure of the LED driver circuit 100 has been described in detail in the above embodiments and will not be repeated here.

[0095] In this embodiment, the LED display module can ensure that the corresponding negative voltage is provided for different types of LEDs, thereby ensuring that each type of LED can work within its most suitable voltage range. This avoids the problem in the prior art of using a single voltage to supply power to all types of LEDs, which leads to excessive power consumption in some driving circuits. It effectively reduces unnecessary power consumption and improves the reliability and applicability of the LED display module.

[0096] In one exemplary embodiment, see Figure 3 The LED driver circuit 100 is provided with a first power supply port gnd1, a second power supply port gnd2, and n constant current output ports, namely Out 1 to Out n; n≥1; the LED display module includes M×n×k LEDs; k≥1; k is a natural number;

[0097] For each of the M LED driver circuits 100, the first power supply port gnd1 of each LED driver circuit 100 is connected to the first external power supply GND1, or the second external power supply GND2; the second power supply port gnd2 of each LED driver circuit 100 is connected to the second external power supply GND2.

[0098] For each of the n constant current output ports of each LED driver circuit 100, each constant current output port is connected to the cathode of k LEDs respectively;

[0099] The anodes of M×n×k LEDs are connected to a third external power supply VDD.

[0100] Preferably, the first external power supply GND1 is used to provide a first access voltage to the first power supply port gnd1;

[0101] The second external power supply GND2 is used to provide a second access voltage to the second power supply port gnd2;

[0102] The third external power supply VDD is used to provide power supply voltage to M×n×k LEDs;

[0103] Wherein, the power supply voltage is greater than the first access voltage; the first access voltage is greater than or equal to the second access voltage.

[0104] For example, with Figure 3 Taking this as an example, assume k=1, the LED display module includes M×n LEDs; the LED display module includes M LED driver circuits 100, namely driver circuit 1, driver circuit 2, driver circuit 3, ..., driver circuit M; assume the voltage of the first external power supply GND1 is 1.3V, the voltage of the second external power supply GND2 is 0V, and the voltage of the third external power supply VDD is 5V.

[0105] Taking the driving circuit 1 as an example, the first power supply port gnd1 of the driving circuit 1 is connected to the first external power supply GND1, and the first input voltage of the first power supply port gnd1 is equal to 1.3V; the second power supply port gnd2 of the driving circuit 1 is connected to the second external power supply GND2, and the second input voltage of the second power supply port gnd2 is equal to 0V; each of the n constant current output ports Out1 to Outn of the driving circuit 1 is connected to the cathode of one LED; the anodes of the n LEDs external to the driving circuit 1 are connected to the third external power supply VDD, and a 5V power supply voltage is provided to the n LEDs external to the driving circuit 1 through the third external power supply VDD.

[0106] Understandable Figure 3 The driving circuit 1 in the middle can be adopted Figure 1 In the structure described above, the constant current output ports Out1 to Outn of the drive circuit 1 are used to connect an external red LED, and the voltage drop corresponding to the red LED is 3.7V.

[0107] Similarly, taking the driving circuit 2 as an example, the first power supply port gnd1 and the second power supply port gnd2 of the driving circuit 2 are both connected to the second external power supply GND2. The first input voltage of the first power supply port gnd1 is equal to the second input voltage of the second power supply port gnd2, which is 0V. Each of the n constant current output ports Out1 to Outn of the driving circuit 2 is connected to the cathode of one LED. The anodes of the n LEDs connected to the driving circuit 2 are connected to the third external power supply VDD, which provides a 5V power supply voltage to the n LEDs connected to the driving circuit 2.

[0108] It is understandable that drive circuit 2 can adopt Figure 1 or Figure 2 Any structure is acceptable, without specific limitations; the constant current output ports Out1 to Outn of the drive circuit 2 are used to connect an external green LED and / or a blue LED, with the voltage drop corresponding to the green LED and / or blue LED being 5V.

[0109] It should be noted that this embodiment is only illustrated with k=1 as an example and is not intended to limit this application; when k is greater than 1, it is also necessary to set a reasonable scan line according to the actual display requirements to ensure the reliability of the LED display module. The principle of setting the scan line can be referred to the prior art, and will not be elaborated here.

[0110] In another exemplary embodiment, see Figure 4 For each of the M LED driver circuits 100, the first power supply port gnd1 of each LED driver circuit 100 is connected to the first external power supply GND1; the second power supply port gnd2 of each LED driver circuit 100 is connected to the second external power supply GND2; for each of the n constant current output ports of each LED driver circuit 100, each constant current output port is connected to the cathode of k LEDs respectively; the anodes of the M×n×k LEDs are connected to the third external power supply VDD.

[0111] It should be noted that, Figure 4 The LED driver circuit 100 in the middle can be adopted Figure 1 or Figure 2 Any structure is acceptable, without specific limitations; if the driving circuit 1 adopts... Figure 1 In the structure described above, the constant current output ports Out1 to Outn of the drive circuit 1 are used to connect an external red LED; if the drive circuit 1 adopts... Figure 2 In the structure described above, the constant current output ports Out1 to Outm of the driving circuit 1 are used to connect an external red LED, and the constant current output ports Outm+1 to Outn of the driving circuit 1 are used to connect an external green LED and / or a blue LED. The specific structure of the LED driving circuit 100 needs to be selected according to the actual application requirements, and is not specifically limited here. It can be understood that the LED display module in this embodiment realizes independent voltage configuration for the red LED.

[0112] In this embodiment, the LED display module can provide corresponding negative voltages for any single-color LED or mixed-color LED, thereby ensuring that each type of LED can work within its most suitable voltage range. This improves the flexibility of the LED display module's voltage configuration and avoids the problem in the prior art of using a single voltage to supply power to all types of LEDs, which leads to excessive power consumption in some driving circuits. This effectively reduces unnecessary power consumption and improves the reliability and applicability of the LED display module.

[0113] In one embodiment, an LED display screen is provided, which includes a main control terminal, a first external power supply, a second external power supply, a third external power supply, and at least one LED display module as described in the above embodiment.

[0114] The main control unit communicates with the LED display module.

[0115] The main control unit may include, but is not limited to, a control chip; the control chip may include, but is not limited to, an MCU; the main control unit is used to send corresponding control commands to the LED display module to control the LED display module to perform corresponding actions. These control commands may include, but are not limited to, scan signals and preset display control data.

[0116] The specific structure of the LED display module has been described in detail in the above embodiments and will not be repeated here.

[0117] The system includes a first external power supply for providing a first access voltage to the LED display module; a second external power supply for providing a second access voltage to the LED display module; a third external power supply for providing a power supply voltage to the LED; and the third external power supply also provides a third access voltage to the LED display module. The power supply voltage (or the third access voltage) is greater than the first access voltage; the first access voltage is greater than or equal to the second access voltage.

[0118] In this embodiment, the LED display screen can provide corresponding negative voltages for any monochrome LED or mixed-color LED, thereby ensuring that each type of LED can work within its most suitable voltage range. This improves the flexibility of the LED display screen's voltage configuration and avoids the problem in the prior art of using a single voltage to supply power to all types of LEDs, which leads to excessive power consumption in some driving circuits. This effectively reduces unnecessary power consumption and improves the reliability and applicability of the LED display screen.

[0119] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0120] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0121] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0122] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0123] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0124] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0125] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0126] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An LED driving circuit, characterized in that, The LED driving circuit includes a digital circuit and an analog circuit, the digital circuit and the analog circuit are connected, and the LED driving circuit is provided with a first power supply port and a second power supply port; The negative power supply terminal of the digital circuit is connected to the second power supply port; The negative power supply terminal of the analog circuit is connected to the target power supply port; wherein, the number of negative power supply terminals of the analog circuit is the same as the number of target power supply ports; the target power supply port is a first power supply port, or, the target power supply port is the first power supply port and the second power supply port; the first access voltage of the first power supply port is greater than or equal to the second access voltage of the second power supply port; The target power supply port is used to connect to the target voltage so that the analog circuit provides a negative voltage to the LED connected to the LED driver circuit based on the target voltage; the second access voltage of the second power supply port is used to provide a negative voltage to the digital circuit so that the digital circuit can operate normally.

2. The LED driving circuit according to claim 1, characterized in that, When the target power supply port is the first power supply port, the target voltage is the first access voltage; The first access voltage is used to provide a negative voltage to the first LED connected to the LED driving circuit so that the first LED can work normally; the second access voltage is used to provide a negative voltage to the digital circuit so that the digital circuit can work normally.

3. The LED driving circuit according to claim 2, characterized in that, The first LED refers to any one of LEDs with different on-state voltage drops.

4. The LED driving circuit according to claim 1, characterized in that, When the target power supply port is the first power supply port and the second power supply port, the target voltage is the first access voltage and the second access voltage; The first access voltage is used to provide a negative voltage to the second LED connected to the LED driving circuit so that the second LED can work normally; the second access voltage is used to provide a negative voltage to the third LED connected to the LED driving circuit and the digital circuit so that the third LED and the digital circuit can work normally.

5. The LED driving circuit according to claim 4, characterized in that, The on-state voltage drop of the second LED is less than that of the third LED.

6. The LED driving circuit according to claim 1, characterized in that, The LED driver circuit is also provided with a third power supply port; The positive power supply terminal of the digital circuit is connected to the third power supply port; the positive power supply terminal of the analog circuit is also connected to the third power supply port. The third access voltage of the third power supply port is used to provide a positive voltage to the digital circuit and the analog circuit.

7. The LED driving circuit according to claim 1, characterized in that, The LED driving circuit also has n constant current output ports; the analog circuit includes n constant current sources; n≥1; The output terminal of the constant current source is connected to the constant current output port in a one-to-one correspondence. The constant current output port is used to connect to the LED and provide drive current to the LED.

8. The LED driving circuit according to claim 1, characterized in that, The LED driving circuit also includes at least one communication port; the digital circuit includes a driving controller. The communication terminal of the drive controller is connected to the communication port of the LED drive circuit in a one-to-one correspondence. The drive controller is used to generate a drive control signal based on the display control data received from the communication terminal, and to perform display control on the LEDs connected to the LED drive circuit based on the drive control signal.

9. An LED display module, characterized in that, The LED display module includes M LED driving circuits as described in any one of claims 1 to 8, and LEDs corresponding to the M LED driving circuits; M ≥ 1.

10. The LED display module according to claim 9, characterized in that, The LED driving circuit has a first power supply port, a second power supply port, and n constant current output ports; n≥1; the LED display module includes M×n×k LEDs; k≥1; For each of the M LED driving circuits, the first power supply port of each LED driving circuit is connected to a first external power supply or a second external power supply; the second power supply port of each LED driving circuit is connected to the second external power supply. For each of the n constant current output ports of each LED driving circuit, each constant current output port is connected to the cathode of k LEDs respectively; The anodes of the M×n×k LEDs are connected to a third external power source.

11. The LED display module according to claim 10, characterized in that, The first external power source is used to provide a first access voltage to the first power supply port; The second external power source is used to provide a second access voltage to the second power supply port; The third external power source is used to provide power supply voltage to the M×n×k LEDs; Wherein, the power supply voltage is greater than the first access voltage; the first access voltage is greater than or equal to the second access voltage.

12. An LED display screen, characterized in that, The LED display screen includes a main control terminal, a first external power supply, a second external power supply, a third external power supply, and at least one LED display module as described in any one of claims 9 to 11; The main control terminal is communicatively connected to the LED display module.

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