Cascaded control system and display device

Abstract

The application discloses a cascade control system and a display device. The cascade control system comprises a main control module and a plurality of sub-control modules. The main control module can output electric energy through a first power supply end to drive each sub-control module to work normally. Meanwhile, the main control module sends an electric signal for indicating the work of each sub-control module to the sub-control module through a first signal end. In the case that the second signal ground end of each sub-control module is connected with the first signal ground end of the main control module and the second power supply ground end of each sub-control module is connected with the first power supply ground end of the main control module, the mutual independence between the power supply circuit and the signal circuit is realized, the influence of the voltage fluctuation of the second power supply ground end on the electric potential of the second signal ground end is effectively avoided, and then the correctness and reliability of the signal recognition of each sub-control module are ensured.

Description

Technical Field

[0001] This application belongs to the field of lighting equipment technology, and in particular relates to cascaded control systems and display devices. Background Technology

[0002] Currently, large display devices have a large number of light-emitting devices. When multiple light-emitting devices are cascaded for control, problems such as large ground noise interference, signal attenuation, and distortion often occur, which may cause the light-emitting devices located at the end of the line to fail to emit light normally. Utility Model Content

[0003] The purpose of this application is to provide a cascade control system and display device, which aims to solve the problems existing in traditional cascade display devices.

[0004] A first aspect of this application provides a cascaded control system, comprising: a main control module, the main control module including a first power supply terminal, a first signal terminal, a first power supply ground terminal, and a first signal ground terminal; and a plurality of sub-control modules, each sub-control module including a second power supply terminal, a second signal terminal, a second power supply ground terminal, and a second signal ground terminal; the second power supply terminal of each sub-control module is connected to the first power supply terminal of the main control module, the second signal terminal of each sub-control module is connected to the first signal terminal of the main control module, the second power supply ground terminal of each sub-control module is connected to the first power supply ground terminal of the main control module, and the second signal ground terminal of each sub-control module is connected to the first signal ground terminal of the main control module.

[0005] In one embodiment, the cascaded control system further includes at least one relay module. The relay module includes a signal input terminal and a signal output terminal. The relay module is used to shape the electrical signal received at the signal input terminal and output the shaped electrical signal from the signal output terminal. The signal input terminal of the relay module is connected to the first signal terminal or the signal output terminal of other relay modules. Specifically, the second signal terminals of some of the sub-control modules are connected to the first signal terminal of the main control module, and the second signal terminals of other sub-control modules are connected to the signal output terminal of the relay module.

[0006] In one embodiment, the relay module further includes a third power supply terminal, a third power supply ground terminal, and a third signal ground terminal; the third power supply terminal of the relay module is connected to the first power supply terminal of the main control module, the third power supply ground terminal of the relay module is connected to the first power supply ground terminal of the main control module, and the third signal ground terminal of the relay module is connected to the first signal ground terminal of the main control module.

[0007] In one embodiment, the cascaded control system further includes a signal ground wire, one end of which is connected to the first signal ground terminal of the main control module. The second signal ground terminals of the sub-control modules and the third signal ground terminal of the relay module are both connected to the first signal ground terminal of the main control module through the signal ground wire. The multiple sub-control modules are divided into multiple control groups, including a first control group and a second control group. The second signal terminal of each sub-control module in the first control group is connected to the first signal terminal of the main control module, and the second signal terminal of each sub-control module in the second control group is connected to the signal output terminal of the relay module. The length of the signal ground wire between the second signal ground terminal of each sub-control module in the second control group and the first signal ground terminal of the main control module, and the length of the signal ground wire between the third signal ground terminal of the relay module and the first signal ground terminal of the main control module, are both greater than the length of the signal ground wire between the second signal ground terminal of each sub-control module in the first control group and the first signal ground terminal of the main control module.

[0008] In one embodiment, the main control module includes a controller and a power supply unit; the controller is connected to the signal input terminal of the relay module, the second signal terminal of the sub-control module, and the second signal ground terminal of the sub-control module, respectively, and the controller is used to output data signals; the power supply unit is connected to the second power supply terminal of the sub-control module and the second power supply ground terminal of the sub-control module, respectively, and the power supply unit is used to output operating voltage.

[0009] In one embodiment, the sub-control module includes a driver chip, which includes a signal processing unit and a driver unit. The signal processing unit is connected to the controller or the relay module and is used to generate a drive signal based on the data signal. The driver unit is connected to the power supply unit and the signal output terminal. The driver unit is used to output a drive voltage based on the drive signal. The signal processing unit is connected to the power supply unit.

[0010] In one embodiment, the data signal is a power line carrier signal.

[0011] In one embodiment, the first power ground terminal of the main control module is connected to the first signal ground terminal of the main control module.

[0012] In one embodiment, the relay module includes the driver chip, which is also used to amplify and shape the data signal before outputting it.

[0013] A second aspect of this application provides a display device including a plurality of light-emitting units and a cascaded control system as described above, wherein the light-emitting units are connected to a sub-control module of the cascaded control system.

[0014] In one embodiment, the light-emitting unit includes an LED light group.

[0015] The beneficial effects of this application embodiment compared to the prior art are as follows: the main control module can output electrical energy through the first power supply terminal to drive each sub-control module to operate normally. Simultaneously, the main control module sends electrical signals to the sub-control modules through the first signal terminal to instruct each sub-control module to operate. With the second signal ground terminal of each sub-control module connected to the first signal ground terminal of the main control module, and the second power supply ground terminal of each sub-control module connected to the first power supply ground terminal of the main control module, the power supply circuit and the signal circuit are made independent of each other. This effectively avoids the influence of voltage fluctuations at the second power supply ground terminal on the potential of the second signal ground terminal, thereby ensuring the accuracy and reliability of signal recognition for each sub-control module. Attached Figure Description

[0016] Figure 1 A schematic diagram of a cascaded control system provided in an embodiment of this application; Figure 2 A schematic diagram of a driver chip provided in an embodiment of this application; Figure 3 Another schematic diagram of a driver chip provided in an embodiment of this application; Figure 4 This is a schematic diagram of a display device provided in an embodiment of this application. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects to be solved by 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 are not intended to limit the scope of this application.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0021] It should be noted that for display devices that use a cascaded configuration, the more light-emitting devices there are in a single display device, and the wider and more dispersed the light-emitting devices are, the longer the overall circuit length of the display device will be.

[0022] Because the driving current of each light-emitting device flows through a common driving ground line, and this common driving ground line has impedance, the driving current causes a significant potential rise (i.e., the "ground bounce" effect) in the driving ground line from the front end to the back end of the system. In traditional display devices with a common ground design, this fluctuating potential also serves as the reference ground for the signal circuit. This causes the low level of the data signal received by the end driver chip to be relatively raised, making it impossible to correctly identify the data signal and resulting in display errors.

[0023] Meanwhile, long-distance transmission also causes data signals to attenuate and distort due to line resistance and distributed capacitance, resulting in sluggish signal edges and reduced distinction between high and low levels, further exacerbating the communication error rate. Especially in multi-cascade, high-current, and long-distance applications, the ground bounce effect and signal quality degradation are coupled together, significantly limiting the number of nodes and wiring length required for stable system operation.

[0024] Figure 1 A schematic diagram of a cascaded control system according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and the details are as follows: A cascaded control system 10 includes a main control module 100 and multiple sub-control modules 300.

[0025] The main control module 100 includes a first power supply terminal, a first signal terminal, a first power supply ground terminal, and a first signal ground terminal.

[0026] The sub-control module 300 includes a second power supply terminal, a second signal terminal, a second power supply ground terminal, and a second signal ground terminal. The second power supply terminal of each sub-control module 300 is connected to the first power supply terminal of the main control module 100. The second signal terminal of each sub-control module 300 is directly or indirectly connected to the first signal terminal of the main control module 100. The second power supply ground terminal of each sub-control module 300 is connected to the first power supply ground terminal of the main control module 100. The second signal ground terminal of each sub-control module 300 is connected to the first signal ground terminal of the main control module 100.

[0027] Understandably, the main control module 100 can output electrical energy through the first power supply terminal to drive each sub-control module 300 to operate normally. At the same time, the main control module 100 sends electrical signals to the sub-control modules 300 through the first signal terminal to instruct each sub-control module 300 to operate.

[0028] With the second signal ground terminal of each sub-control module 300 connected to the first signal ground terminal of the main control module 100, and the second power supply ground terminal of each sub-control module 300 connected to the first power supply ground terminal of the main control module 100, the power supply circuit and the signal circuit are made independent of each other. This can effectively avoid the influence of voltage fluctuations at the second power supply ground terminal on the potential of the second signal ground terminal, thereby ensuring the accuracy and reliability of signal recognition of each sub-control module 300.

[0029] In one embodiment, the cascaded control system 10 further includes at least one relay module 200. The relay module 200 includes a signal input terminal and a signal output terminal. The relay module 200 is used to shape the electrical signal received at the signal input terminal and output the shaped electrical signal from the signal output terminal. The signal input terminal of the relay module 200 is connected to the first signal terminal or the signal output terminal of another relay module 200.

[0030] Among them, the second signal terminal of some sub-control modules 300 is connected to the first signal terminal of the main control module 100, and the second signal terminal of other sub-control modules 300 is connected to the signal output terminal of the relay module 200.

[0031] Understandably, the main control module 100 can output power through its first power supply terminal to drive the various sub-control modules 300 and the relay module 200 to operate normally. Simultaneously, the main control module 100 sends electrical signals to the sub-control modules 300 or the relay module 200 through its first signal terminal to instruct the sub-control modules 300 to operate. Since the relay module 200 only shapes the electrical signals, the electrical signals received at the second signal terminal are the same for both sub-control modules 300 connected to the signal output terminal of the relay module 200 and those connected to the first signal terminal of the main control module 100. Connecting to the signal output terminal of the relay module 200 is equivalent to indirectly connecting to the first signal terminal of the main control module 100. After being shaped by the relay module 200, the electrical signal edge steepness can be effectively restored, improving the distinction between high and low levels, thereby reducing the risk of bit errors caused by long-distance transmission.

[0032] The relay module 200 restructures the signal transmission path, dividing the long-distance signal line into multiple short-distance links, which significantly suppresses cumulative attenuation and delay deviation.

[0033] It should be noted that the various sub-control modules 300 in this embodiment are connected in parallel. In actual use, the communication address of each sub-control module 300 can be configured according to actual needs so that each sub-control module 300 can obtain the control data it needs based on the same data signal.

[0034] Meanwhile, since the various sub-control modules 300 are connected in parallel, the relay module 200 can interrupt signal reflection, avoid signal echo superposition caused by impedance mismatch, and thus improve system stability and communication reliability.

[0035] In some embodiments, the relay module 200 can amplify, shape, or regenerate the received electrical signal according to its own clock information and then output it directly without modifying or caching any address information and control data in the electrical signal. As a transparent signal repeater, it greatly simplifies engineering design and subsequent maintenance.

[0036] The position of the relay module 200 in the cascaded control system 10 can be flexibly adjusted according to actual needs.

[0037] In one embodiment, the relay module 200 further includes a third power supply terminal, a third power supply ground terminal, and a third signal ground terminal.

[0038] The third power supply terminal of the relay module 200 is connected to the first power supply terminal of the main control module 100, the third power ground terminal of the relay module 200 is connected to the first power ground terminal of the main control module 100, and the third signal ground terminal of the relay module 200 is connected to the first signal ground terminal of the main control module 100.

[0039] Understandably, the first power supply terminal of the main control module 100 can also supply power to the relay module 200. By configuring the relay module 200 with an independent third power ground terminal and a third signal ground terminal, it is further ensured that its signal shaping circuit is not affected by the noise of the drive current loop when it is working. This allows the relay module 200 to maintain a high signal-to-noise ratio response while regenerating signals, making it particularly suitable for LED control scenarios with multi-level cascades and long-distance transmission, effectively improving system stability and anti-interference performance.

[0040] By separating the power and signal grounding paths in the relay module 200, the noise coupling path caused by common ground impedance in the cascaded system is further blocked.

[0041] In one embodiment, the cascaded control system 10 further includes a signal ground wire, one end of which is connected to the first signal ground terminal of the main control module 100. The second signal ground terminal of the sub-control module 300 and the third signal ground terminal of the relay module 200 are both connected to the first signal ground terminal of the main control module 100 through the signal ground wire.

[0042] Multiple sub-control modules 300 are divided into multiple control groups, such as Figure 1 As shown, the multiple control groups include a first control group 410 and a second control group 420. The second signal terminal of each sub-control module 300 in the first control group 410 is connected to the first signal terminal of the main control module 100, and the second signal terminal of each sub-control module 300 in the second control group 420 is connected to the signal output terminal of the relay module 200.

[0043] The length of the signal ground wire between the second signal ground terminal of each sub-control module 300 in the second control group 420 and the first signal ground terminal of the main control module 100, as well as the length of the signal ground wire between the third signal ground terminal of the relay module 200 and the first signal ground terminal of the main control module 100, are all greater than the length of the signal ground wire between the second signal ground terminal of each sub-control module 300 in the first control group 410 and the first signal ground terminal of the main control module 100.

[0044] It is understandable that the longer the signal ground wire between a node and the main control module 100, the greater the signal loop impedance between the signal terminal of that node and the main control module 100, and the more significant the signal distortion. Therefore, deploying the relay module 200 between the second control group 420 and the main control module 100 can effectively compensate for the impedance mismatch and signal attenuation introduced by the long signal ground wire, and restore signal integrity.

[0045] In some embodiments, the cascaded control signal includes multiple relay modules 200 and multiple second control groups 420. One relay module 200 is connected to one or more second control groups 420. Each relay module 200 can be cascaded or connected in parallel to the signal output path of the main control module 100.

[0046] In one embodiment, the main control module 100 includes a controller and a power supply unit.

[0047] The controller is connected to the signal input terminal of the relay module 200, the second signal terminal of the sub-control module 300, and the second signal ground terminal of the sub-control module 300, respectively, and is used to output data signals.

[0048] The power supply unit is connected to the second power supply terminal and the second power supply ground terminal of the sub-control module 300, respectively, and is used to output the working voltage.

[0049] It should be noted that the operating voltage needs to be adjusted according to the rated operating voltage of each module in the system to ensure that the relay module 200 and each sub-control module 300 can work normally. Data signals are used to control each sub-control module 300 and configure the operating parameters and operating modes of each sub-control module 300.

[0050] In one embodiment, such as Figure 2 As shown, the sub-control module 300 includes a driver chip 310, which includes a signal processing unit 311 and a driving unit 312.

[0051] The signal processing unit 311 is connected to the controller or the relay module 200 and is used to generate a drive signal based on the data signal. The drive unit 312 is connected to the power supply unit and the signal output terminal and is used to output a drive voltage based on the drive signal.

[0052] Specifically, the signal processing unit 311 of the driver chip 310 can be used to parse the received data signal and extract control commands, while the driver unit 312 generates the corresponding drive voltage output according to the commands.

[0053] It is understandable that the driving voltage can be used to drive the corresponding light-emitting unit 20. By controlling the parameters of the driving voltage, the operating state of the light-emitting unit 20 can be controlled.

[0054] For example, such as Figure 2As shown, the driver chip 310 includes a first pin D1, a second pin VCC, a third pin GND, a fourth pin VSS, and a fifth pin OUT. The first pin D1 corresponds to the second signal terminal and is used to receive data signals; the second pin VCC corresponds to the second power supply terminal and is used to connect the operating voltage; the third pin GND corresponds to the second signal ground terminal and forms the signal loop reference ground; the fourth pin VSS corresponds to the second power supply ground terminal and forms the power supply loop reference ground; the fifth pin OUT can be used to connect to the light-emitting unit 20 and is used to output the driving voltage.

[0055] In some embodiments, the driving voltage can be either the positive electrode voltage of the light-emitting unit 20, or... Figure 3 As shown, it can also be used as the negative voltage of the light-emitting unit 20, depending on the power supply method of the light-emitting unit 20.

[0056] In one embodiment, the signal processing unit 311 is connected to the power supply unit.

[0057] The signal processing unit 311 can operate under the drive of the operating voltage. The power supply unit can simultaneously provide operating voltage to both the signal processing unit 311 and the drive unit 312, ensuring that both operate stably under the same power supply conditions.

[0058] In one embodiment, the data signal is a power line carrier signal.

[0059] When the data signal is a power line carrier signal, the signal processing unit 311 extracts control commands from the power line using carrier demodulation technology, enabling co-line transmission of data and power. This method significantly reduces the number of cables, improves system wiring flexibility, and is suitable for long-distance, multi-node distributed control scenarios.

[0060] It is understandable that when using power line carrier signals as data signals, operating voltage and data signals can be transmitted simultaneously through the same trace. Accordingly, the second signal terminal and the first power supply terminal of the sub-control module can be the same terminal.

[0061] In one embodiment, the first power ground terminal of the main control module 100 is connected to the first signal ground terminal of the main control module 100.

[0062] It is understandable that the voltage of the first power ground terminal of the main control module 100 is relatively stable. When the first power ground terminal and the first signal ground terminal are connected, the first power ground terminal can provide a stable voltage to the first signal ground terminal.

[0063] In one embodiment, the relay module 200 includes a driver chip 310, which is also used to amplify and shape the data signal before outputting it.

[0064] Understandably, by using the same driver chip 310 in both the relay module 200 and the sub-control module 300, flexible configuration and rapid deployment of the cascaded control system 10 can be achieved, reducing system design complexity. Through the unified driver chip 310 architecture, the relay module 200 requires no protocol conversion or additional configuration during signal forwarding, ensuring transparent data transmission. Simultaneously, the consistent electrical characteristics between modules at each level effectively suppress signal distortion accumulation and improve overall system stability. The relay module 200 can also be used to drive corresponding loads.

[0065] Specifically, the signal processing unit 311 can shape the data signal and restore the signal attenuation caused by the transmission distance, ensuring that the downstream driver chips 310 at each stage can accurately identify and parse the data. After completing the signal amplification and shaping, the relay module 200 continues to transmit the distortion-free signal to the next stage, ensuring the timing consistency and integrity of all control commands in the system.

[0066] like Figure 2 As shown, the driver chip 310 also includes a sixth pin DOUT. In the relay module 200, the first pin DI of the driver chip 310 corresponds to the signal input terminal, the second pin VCC of the driver chip 310 corresponds to the third power supply terminal, and is used to connect the working voltage; the third pin GND of the driver chip 310 corresponds to the third signal ground terminal, forming the signal loop reference ground; the fourth pin VSS of the driver chip 310 corresponds to the third power supply ground terminal, forming the power supply loop reference ground; and the sixth pin DOUT of the driver chip 310 corresponds to the signal output terminal, and is used to output the processed data signal to the next node.

[0067] Figure 4 A schematic diagram of a display device according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and the details are as follows: A display device 30 includes a plurality of light-emitting units 20 and a cascaded control system 10 as described in any of the above embodiments, wherein the light-emitting units 20 are connected to a sub-control module 300 and a relay module 200 of the cascaded control system 10.

[0068] The driving voltage output by the sub-control module 300 and the driving voltage output by the relay module 200 can both be used to light up the corresponding connected light-emitting unit 20. By adjusting the amplitude, frequency or duty cycle and other electrical parameters of the driving voltage, precise control of the brightness, color temperature or flicker frequency of the light-emitting unit 20 can be achieved.

[0069] Since the display device 30 includes the cascade control system 10 of any of the above embodiments, the display device 30 has the beneficial effects of the cascade control system 10 of any of the above embodiments, which will not be described in detail here.

[0070] In one embodiment, the light-emitting unit 20 includes an LED light group. An LED light group may include multiple LED beads connected in series or in parallel. One light-emitting unit 20 can serve as a sub-pixel unit, and by lighting LED beads of different colors, multi-color mixed light output can be achieved to meet the lighting or display needs in different scenarios.

[0071] For example, in actual operation, the controller of the main control module 100 can send data signals through the data bus and a separate signal ground line.

[0072] The relay module 200 located in the cascade control system 10 uses its own stable third signal ground potential as a reference to identify the data signal from the signal input terminal, and after regenerating and enhancing the signal, forwards it to the subsequent link through its signal output terminal, and intercepts the corresponding control data according to its own communication address to drive the light-emitting unit 20.

[0073] Each sub-control module 300 in the cascaded control system 10 uses its own stable second signal ground potential as a reference to identify the data signal on the data bus, and extracts the corresponding control data according to its own address to drive the light-emitting unit 20.

[0074] From the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0075] It should be understood that the apparatuses and methods disclosed in the several embodiments provided in this application can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of modules or units is only a logical functional division. In actual implementation, there may be other division methods, such as multiple units or components being combined or integrated into another device. In addition, some features may be omitted or not performed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0076] The units described as separate components may or may not be physically separate. A component shown as a unit can be one or more physical units. That is, it can be located in one place or distributed in multiple different locations. Depending on the actual needs, some or all of the units can be selected to achieve the purpose of this solution.

[0077] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit; they can also exist physically separately; or some units can be integrated into one unit while others exist physically separately. The integrated units described above can be implemented in hardware or as software functional units.

[0078] It should be noted that all or part of the above embodiments provided in this application (e.g., part or all of any feature) can be arbitrarily combined or combined with each other.

[0079] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cascaded control system, characterized in that, include: The main control module includes a first power supply terminal, a first signal terminal, a first power supply ground terminal, and a first signal ground terminal; Multiple sub-control modules are provided, each sub-control module including a second power supply terminal, a second signal terminal, a second power supply ground terminal, and a second signal ground terminal. The second power supply terminal of each sub-control module is connected to the first power supply terminal of the main control module, the second signal terminal of each sub-control module is connected to the first signal terminal of the main control module, the second power supply ground terminal of each sub-control module is connected to the first power supply ground terminal of the main control module, and the second signal ground terminal of each sub-control module is connected to the first signal ground terminal of the main control module.

2. The cascaded control system as described in claim 1, characterized in that, The cascaded control system further includes at least one relay module. The relay module includes a signal input terminal and a signal output terminal. The relay module is used to shape the electrical signal received by the signal input terminal and output the shaped electrical signal from the signal output terminal. The signal input terminal of the relay module is connected to the first signal terminal or the signal output terminal of other relay modules. In this configuration, the second signal terminal of some of the sub-control modules is connected to the first signal terminal of the main control module, while the second signal terminal of another part of the sub-control modules is connected to the signal output terminal of the relay module.

3. The cascaded control system as described in claim 2, characterized in that, The relay module also includes a third power supply terminal, a third power supply ground terminal, and a third signal ground terminal; The third power supply terminal of the relay module is connected to the first power supply terminal of the main control module, the third power supply ground terminal of the relay module is connected to the first power supply ground terminal of the main control module, and the third signal ground terminal of the relay module is connected to the first signal ground terminal of the main control module.

4. The cascaded control system as described in claim 3, characterized in that, The cascaded control system also includes a signal ground wire, one end of which is connected to the first signal ground terminal of the main control module. The second signal ground terminal of the sub-control module and the third signal ground terminal of the relay module are both connected to the first signal ground terminal of the main control module through the signal ground wire. The multiple sub-control modules are divided into multiple control groups, including a first control group and a second control group. The second signal terminal of each sub-control module in the first control group is connected to the first signal terminal of the main control module, and the second signal terminal of each sub-control module in the second control group is connected to the signal output terminal of the relay module. The length of the signal ground wire between the second signal ground terminal of each of the sub-control modules in the second control group and the first signal ground terminal of the main control module, and the length of the signal ground wire between the third signal ground terminal of the relay module and the first signal ground terminal of the main control module are both greater than the length of the signal ground wire between the second signal ground terminal of each of the sub-control modules in the first control group and the first signal ground terminal of the main control module.

5. The cascaded control system as described in claim 2, characterized in that, The main control module includes a controller and a power supply unit; The controller is connected to the signal input terminal of the relay module, the second signal terminal of the sub-control module, and the second signal ground terminal of the sub-control module, respectively, and the controller is used to output data signals; The power supply unit is connected to the second power supply terminal of the sub-control module and the second power supply ground terminal of the sub-control module, respectively, and the power supply unit is used to output the working voltage.

6. The cascaded control system as described in claim 5, characterized in that, The sub-control module includes a driver chip, and the driver chip includes a signal processing unit and a driving unit. The signal processing unit is connected to the controller or the relay module and is used to generate a drive signal based on the data signal. The drive unit is connected to the power supply unit and the signal output terminal. The drive unit is used to output a drive voltage based on the drive signal. The signal processing unit is connected to the power supply unit.

7. The cascaded control system as described in claim 6, characterized in that, The data signal is a power line carrier signal.

8. The cascaded control system according to any one of claims 1 to 7, characterized in that, The first power ground terminal of the main control module is connected to the first signal ground terminal of the main control module.

9. The cascaded control system as described in claim 6 or 7, characterized in that, The relay module includes the driver chip, which is also used to amplify and shape the data signal before outputting it.

10. A display device, characterized in that, It includes multiple light-emitting units and a cascaded control system as described in any one of claims 1 to 9, wherein the light-emitting units are connected to the sub-control modules and relay modules of the cascaded control system.

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