Control method and system of low-voltage driven LED wallpaper display screen and medium

Abstract

This application relates to the technical field of LED displays, and discloses a control method, system, and medium for a low-voltage driven LED wallpaper display screen. The method includes: dividing the back of the display screen into an independent power supply area and a communication area, and setting up a power supply module and a communication module respectively. The power supply area is equipped with a shielding layer, and the outer periphery of the two areas is equipped with a switchable shielding isolation module; determining the power supply status through a first voltage detection module, activating the shielding isolation module, and having the power supply module supply power to the communication module to output a second voltage; detecting the voltage value of the second voltage interface, and activating the data extraction submodule after it meets the power supply range; and realizing the simultaneous transmission of power supply and communication data through a communication read / write unit, with the communication data carrying voltage being lower than the power supply voltage. This application suppresses power supply interference through partitioned electromagnetic shielding, and combines dual power supply interlocking switching, power supply adaptation detection, dynamic voltage regulation, overheat protection, and line impedance adaptive voltage compensation to improve the power supply and communication stability of the display screen and the overall operational reliability.

Description

Technical Field

[0001] This application relates to the technical field of LED displays, and in particular to a control method, system, and medium for a low-voltage driven LED wallpaper display. Background Technology

[0002] LED wallpaper displays, as a new type of display device, are characterized by their ultra-thin and lightweight nature, flexible fit, clear display effect, low power consumption, and adaptability to various application scenarios. They can be closely attached to walls and other carriers to achieve "invisible" display and integration with spatial aesthetics, and are widely used in architectural decoration, high-end offices, residential audio-visual and other fields.

[0003] Currently, the electrical structure design of LED wallpaper displays still follows the mature design scheme of conventional LED displays, without targeted optimization for their unique ultra-thin, low-voltage driven structure. Specifically, the low-voltage power supply lines that provide operating power to the display, and the communication power supply lines used to transmit control signals and realize display control, are both integrated into the back area of ​​the LED wallpaper display. Due to the limited installation space on the back of the display and the lack of clear partitioning and isolation between the two types of lines in the structural design, the layout areas of the low-voltage power supply lines and the communication power supply lines partially overlap, resulting in a messy and irrational wiring arrangement.

[0004] Given the ultra-thin design requirements of LED wallpaper displays, the space for wiring on the back is further compressed, significantly reducing the distance between low-voltage power supply lines and communication power supply lines, with some areas even being adjacent to each other. Low-voltage power supply lines generate electromagnetic interference during operation, and without sufficient spacing and effective isolation measures, this interference can easily affect the signal transmission stability of the communication power supply lines through coupling. Summary of the Invention

[0005] To improve the stability of LED wallpaper display screen operation, this application provides a control method, system, and medium for a low-voltage driven LED wallpaper display screen.

[0006] In a first aspect, this application provides a control method for a low-voltage driven LED wallpaper display screen, employing the following technical solution: A control method for a low-voltage driven LED wallpaper display screen includes the following steps: A power supply area and a communication area are set up behind the display screen. The power supply area is used to set up the power supply module, which is connected to a first voltage interface. The power supply area is equipped with a shielding layer to separate the display screen and the power supply area. A shielding isolation module is set around the power supply area or the communication area to isolate the power supply area or the communication area. The communication area is used to set up the communication module, which is connected to a second voltage interface through a communication power supply line. The connection status of the first voltage interface is detected by the preset first voltage detection module; if the first voltage interface is in the preset first voltage power supply state, the shielding isolation module is activated, the power supply module supplies power to the communication module, and outputs the second voltage; if the first voltage interface is in the preset first voltage de-energized state, the shielding isolation module is turned off. The second voltage detection module detects the voltage value of the second voltage interface based on the preset second voltage detection module. If the second voltage value is within the preset second voltage power supply range, the data extraction submodule is activated. The data extraction submodule includes a communication interface, a communication writing unit, and a communication reading unit that are electrically connected in sequence. The communication interface and the communication writing unit are located next to the second voltage interface. The communication writing unit is electrically connected to the communication power supply line. The communication writing unit writes the communication data received through the communication interface onto the communication power supply line. The communication reading unit is connected in series between the communication power supply line and the control center of the communication module. It is used to supply power to the control center and read the communication data on the communication power supply line and send it to the control center. Among them, the voltage value when the communication power supply line carries communication data is lower than the voltage value within the second voltage power supply range.

[0007] By adopting the above technical solution, the power supply module and communication module are set up separately, and the start-stop control of the shielding layer and shielding isolation module is used to effectively solve the problem of electromagnetic radiation interference caused by the cross-over of the back lines of the LED wallpaper display. At the same time, the voltage detection mechanism is used to adapt to the low voltage driving requirements. Combined with the special structural design of the data extraction submodule, under the premise of adapting to the space constraints of the ultra-thin design, both the stability of power supply and the reliability of communication signal transmission are guaranteed, and the coordinated adaptation of power supply and communication is achieved, which significantly improves the overall working stability of the low voltage driven LED wallpaper display.

[0008] Optionally, the method further includes the following steps: The shielding and isolation module includes a metal enclosure surrounding the power supply area or communication area and a controlled switch; The controlled switch is connected to the control center in a controlled manner, and the control center changes the operating state of the controlled switch in response to the isolation command; When the controlled switch is in the execution state, the metal enclosure is closed and / or reaches the set potential; when the controlled switch is in the non-execution state, the metal enclosure is open and / or in a high-resistance state.

[0009] By adopting the above technical solution, a shielded isolation module is formed by metal enclosure and controlled switch. The working state can be flexibly switched in response to the command of the control center. This not only realizes the physical separation and electromagnetic shielding between the power supply area and the communication area, but also improves the flexibility of isolation control, effectively blocks electromagnetic interference, and further ensures the reliability of communication signals and the working stability of the display screen.

[0010] Optionally, the method further includes the following steps: When the first voltage interface is connected to the corresponding first power supply and the second voltage interface is not connected to the corresponding second power supply, the first voltage interface is locked and the second voltage interface is unlocked. When the first voltage interface is in a locked state, if the second voltage interface is connected to the corresponding second power supply, the second voltage interface is first controlled to switch to a locked state, then the first voltage interface is switched to an unlocked state, and the power supply channel between the first voltage interface and the power supply module is cut off. When the second power source meets the preset power-off state, the power supply channel between the first voltage interface and the power supply module is turned on, the first voltage interface is switched to a locked state, the second voltage interface is switched to an unlocked state, and the power supply channel between the second voltage interface and the communication module is turned off.

[0011] By adopting the above technical solution, the control logic uses a dual-voltage interface locking and unlocking mechanism and orderly switching of power supply channels to clarify the power access priority, effectively avoid power conflicts, ensure safe switching between power supply and communication power supply, adapt to low-voltage drive requirements, and improve the safety and overall stability of display power supply control.

[0012] Optionally, connecting the second voltage interface to the corresponding second power supply further includes the following sub-steps: If the second voltage value is within the second voltage power supply range, calculate the fluctuation range and dispersion value of the second voltage value within a preset set time period; The ratio of the fluctuation amplitude to the preset reference amplitude is calculated as the amplitude sub-item, and the ratio of the fluctuation degree value to the preset reference discrete value is calculated as the discrete sub-item. The corresponding term is calculated by weighting the amplitude sub-term and the discrete sub-term. If the corresponding term is less than the preset reference term, then the second power supply corresponds to the second voltage interface; otherwise, the second power supply does not correspond to the second voltage interface.

[0013] By adopting the above technical solution, the compatibility between the second power supply and the interface can be accurately determined by calculating the fluctuation amplitude and dispersion of the second voltage and comparing them with weights, thus avoiding power supply abnormalities caused by the connection of incompatible power supplies and ensuring the stability of communication and display screen operation under low voltage drive.

[0014] Optionally, the method further includes the following steps: After multiple set durations, obtain the corresponding items for the multiple set durations, and calculate the average of the multiple corresponding items as the corresponding average item; If the first voltage interface is connected to the first power supply, the range of the second voltage supply range is adjusted according to the negative correlation of the corresponding average term.

[0015] By adopting the above technical solution, and by calculating the average value of the corresponding terms over multiple cycles and dynamically adjusting the second voltage power supply range in a negative correlation, the accuracy of power supply adaptation judgment can be improved, the anti-interference capability can be enhanced, and the power supply can be ensured to be stable and reliable.

[0016] Optionally, the method further includes the following steps: Multiple temperature sensors are installed on the LED wallpaper display screen. The temperature sensors are used to collect the temperature of the corresponding parts of the LED wallpaper display screen and generate temperature data. The display screen temperature value is calculated by weighting multiple temperature data. If the temperature displayed on the screen is greater than the preset reference temperature, the timer starts to measure the temperature rise duration; otherwise, the temperature rise duration is initialized. If the temperature rise time exceeds the preset first reference time, then obtain the connection status of the first voltage interface and the second voltage interface; If the first voltage interface is locked and the second voltage interface is unlocked, an over-temperature warning will be generated. If the second voltage interface is connected to a corresponding second power supply, the second voltage interface is first controlled to switch to the locked state, then the first voltage interface is switched to the unlocked state, and the power supply channel between the first voltage interface and the power supply module is cut off. Then the timer is used to obtain the power supply replacement time. If the power supply replacement time exceeds the preset second reference time and the temperature rise time has not been initialized, an over-temperature alarm will be generated.

[0017] By adopting the above technical solution, the screen temperature is accurately monitored through multi-point temperature acquisition and weighted analysis. The overheating state is judged in stages based on the temperature rise time. The dual power interfaces are automatically switched and locked to achieve graded early warning alarms, thereby improving the accuracy and operational safety of the display screen overheat protection.

[0018] Optionally, the method further includes the following steps: The main power supply line in the power supply area is a low-voltage power supply line, which is electrically connected to the communication writing unit and the communication reading unit through a preset physical connection switch; If the first voltage interface is in the unlocked state and the second voltage interface is in the locked state, an interlock mark is generated; otherwise, the interlock mark is cleared. Based on the interlocking mark, both the communication write unit and the communication read unit are switched to be connected to the low-voltage power supply line via a physical connection switch; after the interlocking mark is set, the physical connection switch is disconnected.

[0019] By adopting the above technical solution, interlocking markers are used in conjunction with physical connection switches to achieve interlocking switching connections between low-voltage power supply lines and communication read / write units, avoiding interference from mixed power supply and communication lines, ensuring line switching safety, and improving signal transmission and power supply stability.

[0020] Optionally, the method further includes the following steps: Obtain the line status between the communication write unit and the communication read unit; The line length and line impedance values ​​are extracted from a preset line database based on the line status. The length is calculated based on the line length and the preset reference length, and the impedance is calculated based on the line impedance and the preset reference impedance. The voltage adjustment value is calculated by weighting the length and impedance values, and the voltage value corresponding to the communication data is adjusted according to the positive correlation of the voltage adjustment value.

[0021] By adopting the above technical solution, the voltage regulation value is calculated based on the communication line status, length, and impedance weighting, and the communication data voltage is adjusted in a positive correlation. This can effectively compensate for line transmission loss and ensure stable and reliable transmission of communication signals under different line operating conditions.

[0022] Secondly, this application provides a control system for a low-voltage driven LED wallpaper display screen, which adopts the following technical solution: A control system for a low-voltage driven LED wallpaper display includes a processor that performs the steps of the control method for a low-voltage driven LED wallpaper display as described in any of the preceding claims.

[0023] Thirdly, this application provides a medium, which adopts the following technical solution: A medium storing a program that, when executed by a processor, implements the steps of the control method for a low-voltage driven LED wallpaper display screen as described in any one of the preceding claims.

[0024] In summary, this application includes at least one of the following beneficial technical effects: By partitioning the power supply and communication modules and cooperating with dynamic shielding and isolation, this application effectively suppresses the interference of low-voltage power supply electromagnetic radiation on communication signals; by adopting dual power supply interface interlocking switching, precise adaptation detection, and dynamic power supply range adjustment, it avoids power supply conflicts and abnormal access; by combining multi-point temperature monitoring to achieve graded overheat protection, and by adaptively compensating the communication voltage according to the line length and impedance, it fully adapts to the ultra-thin and low-voltage driving structural characteristics of LED wallpaper displays, comprehensively improving power supply safety, communication stability, and overall machine operation reliability. Attached Figure Description

[0025] Figure 1 This is a step diagram illustrating a control method for a low-voltage driven LED wallpaper display screen.

[0026] Figure 2 This is a flowchart illustrating the structural configuration and dynamic switch control of the shielded isolation module.

[0027] Figure 3This is a flowchart illustrating the steps of locking / unlocking the dual-voltage interface and the orderly switching of the power supply channel. Detailed Implementation

[0028] The embodiments of this application are described in detail below, and examples of the embodiments are shown in the accompanying drawings.

[0029] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] This embodiment discloses a control method for a low-voltage driven LED wallpaper display screen, applicable to ultra-thin, flexible, and 220V AC input to 24V DC low-voltage output LED wallpaper displays. The overall system adopts a 24V low-voltage drive, aiming to solve the problems of mixed power supply and communication lines, severe electromagnetic interference, and unstable signal transmission in traditional LED wallpaper displays. (Refer to...) Figure 1 Specifically, it includes the following steps: S1. Zoned layout and shielding structure of the back area of ​​the display screen Within the limited installation space behind the LED wallpaper display screen, separate power supply and communication areas are physically divided to achieve partitioned layout of power supply lines and communication lines, structurally avoiding the problems of crossover and excessive spacing between the two types of lines.

[0031] The power supply area is used to install the power supply module. The power supply module adopts a step-down conversion structure with 220V AC input and 24V DC output. The overall operating voltage of the display screen is 24V low voltage, which meets the low voltage drive design requirements. The power supply module is connected to the first voltage interface, which is a 24V low voltage power supply input interface for connecting to an external DC power supply.

[0032] A shielding layer is attached inside the power supply area. The shielding layer can be made of conductive shielding materials such as copper foil or aluminum foil. It is used to separate the LED wallpaper display screen body from the power supply module and prevent the electromagnetic radiation generated by the power supply module from directly radiating to the screen's light-emitting unit.

[0033] Meanwhile, shielding and isolation modules are installed around the power supply area or the communication area. These modules are electromagnetic shielding and isolation structures used to achieve electromagnetic isolation between the power supply area and the communication area, further blocking the electromagnetic radiation generated by the power supply line from coupling and conducting to the communication area.

[0034] The communication area is used to install the communication module, which is the core unit for display and control of the screen. The communication module is connected to the second voltage interface through a dedicated communication power supply line. The second voltage interface is used to provide the communication module with the appropriate operating voltage to realize the synchronous transmission of power supply and communication signals.

[0035] S2, Start / Stop Control of First Voltage Status Detection and Shielding Isolation Module The preset first voltage detection module detects the voltage connection status and power supply stability of the first voltage interface in real time, and determines whether the first voltage interface is in the preset first voltage power supply state. If the first voltage interface is stably connected to a 24V low-voltage power supply, i.e., it is in the first voltage power supply state: the control system automatically starts the shielding isolation module, so that the shielding isolation module enters the fully shielded working state, completely blocking the electromagnetic radiation from the power supply area to spread to the communication area; at the same time, the power supply module works normally under the 24V low-voltage input, converting the 24V voltage into a second voltage adapted to the communication module, providing a stable working power supply for the communication module and outputting the second voltage.

[0036] If the first voltage interface is not connected to a power source or the voltage is interrupted, it is in the first voltage de-energized state: the control system automatically shuts down the shielding isolation module and stops the shielding operation to reduce overall power consumption, adapting to the low power consumption and ultra-thin requirements of LED wallpaper displays.

[0037] S3, Start-up control of the second voltage detection and data extraction submodule The real-time voltage value of the second voltage interface is collected in real time through the preset second voltage detection module and recorded as the second voltage value; The system presets a second voltage supply range, which is the safe low-voltage range for normal operation of the communication module, and the voltage value is lower than the 24V supply voltage. If the second voltage value is detected to be stable within the preset second voltage power supply range, it indicates that the power supply of the communication module is stable and meets the working conditions. The control system starts the data extraction submodule and enters the display control signal transmission and processing working mode. If the second voltage value exceeds the range, the data extraction submodule is kept off to avoid communication failure caused by abnormal voltage.

[0038] S4, Data Extraction Submodule Operation and Power Supply Communication Coordinated Transmission The data extraction submodule includes a communication interface, a communication write unit, and a communication read unit that are electrically connected in sequence. The whole module adopts an integrated and compact structure, which is suitable for the ultra-thin and lightweight space constraints of LED wallpaper displays. The communication interface and the communication writing unit are located adjacent to the second voltage interface to shorten the wiring distance and reduce line loss and interference. The communication writing unit is directly electrically connected to the communication power supply line and is used to load and write the display control data input by the external control device through the communication interface onto the communication power supply line.

[0039] The communication reading unit is connected in series between the communication power supply line and the control center of the communication module. It has a dual function: on the one hand, it serves as a power supply path, transmitting the second voltage to the control center to provide working power; on the other hand, it serves as a signal reading unit, collecting and analyzing the communication data carried on the communication power supply line in real time, and transmitting the data to the control center to realize display control.

[0040] In this embodiment, the communication power supply line adopts a power supply and signal multiplexing design: the signal voltage value carried on the communication power supply line when displaying communication data is strictly lower than the power supply voltage value within the second voltage power supply range. The power supply level and signal level are distinguished by the voltage amplitude, so that the power supply and communication signals are transmitted synchronously on the same line without interfering with each other, further simplifying the back circuit structure and meeting the requirements of ultra-thin and lightweight deployment.

[0041] Through the above control methods, this application implements physical partitioning and electromagnetic shielding dual isolation between the power supply module and the communication module, thoroughly solving the problem of electromagnetic radiation interference with communication signals from both structural and electrical aspects. Combining the 24V low-voltage drive characteristics with voltage detection closed-loop control, intelligent start-stop of the shielded isolation module is achieved. At the same time, a data extraction structure that reuses the same power supply and communication lines is adopted. Under the premise of extremely compressing the back space, it not only ensures the stability of the 24V low-voltage power supply, but also improves the anti-interference capability and reliability of communication signal transmission, realizing the coordinated adaptation of power supply and communication, and greatly improving the overall working stability, operational safety and spatial adaptability of the low-voltage driven LED wallpaper display screen.

[0042] S5. Shielding and isolation module structure configuration and dynamic controlled switching Reference Figure 2 This embodiment further optimizes the specific structure and electrical control logic of the shielding and isolation module, specifically including the following steps: In this embodiment, the shielding and isolation module adopts an active and controllable electromagnetic shielding structure, which consists of two parts: a metal enclosure and a controlled switch.

[0043] The metal enclosure is made of highly conductive metal materials such as copper, aluminum, and conductive alloys. It is a ring-shaped closed or semi-closed enclosure structure that surrounds and covers the outer perimeter of the power supply area or the outer perimeter of the communication area, forming a physical enclosed shielding cavity. This blocks the electromagnetic radiation generated by the low-voltage power supply line in the power supply area from being transmitted to the communication area, thus preventing electromagnetic signals from interfering with the communication power supply line through spatial coupling.

[0044] The controlled switch uses devices such as MOSFETs, solid-state relays, and electronically controllable switches. Its control terminal is connected to the control center of the communication module. The control center outputs isolation commands according to the system's working status, thereby changing the on / off working state of the controlled switch.

[0045] The control center generates isolation commands based on parameters such as the power supply status of the first voltage interface, system power consumption requirements, and electromagnetic interference levels, and then uses these commands to control the controlled switches in real time. When the controlled switch receives the isolation command and is in the execution state, the metal enclosure forms a complete closed conductive loop, and / or the metal enclosure is connected to a preset set potential, such as the system ground potential or the shielding reference potential, through the controlled switch, so that the metal enclosure is in an equipotential shielding state, which has a high-efficiency electromagnetic shielding capability and can greatly suppress the interference of power supply electromagnetic radiation on communication signals.

[0046] When the controlled switch is in the non-executing state, the electrical connection of the metal enclosure is cut off, the shielding loop is open, and / or the metal enclosure is in a high-resistance state, no longer forming an effective equipotential shielding surface, and the shielding function is suspended to reduce the system's useless power consumption, which meets the design requirements of low power consumption and ultra-thin design of LED wallpaper displays.

[0047] Through the above structure and control method, the shielding and isolation module can dynamically start and stop the shielding function under the command of the control center. This ensures the effectiveness of electromagnetic isolation under power supply conditions and reduces energy consumption under power failure or standby conditions, achieving a balance between shielding effect and system power consumption. It further improves the electromagnetic isolation accuracy and control flexibility between the power supply area and the communication area, strengthens the suppression of electromagnetic interference from the electrical control level, ensures stable communication signal transmission, and improves the overall reliability of the LED wallpaper display screen.

[0048] S6. Dual voltage interface lock / unlock control and orderly switching of power supply channels. Reference Figure 3 To further optimize power supply safety and switching reliability under low-voltage drive, a locking / unlocking mechanism is designed for the access logic of the dual-voltage interface to achieve orderly switching of power supply channels. The specific steps include: In this embodiment, the first power supply is defined as a 24V low-voltage DC power supply adapted to the first voltage interface, and the second power supply is a dedicated low-voltage power supply for the communication module adapted to the second voltage interface. The voltage value matches the preset second voltage power supply range, such as 12V, 5V, etc. Both types of power supplies meet the low-voltage driving requirements of the LED wallpaper display screen, and the locking and unlocking mechanism avoids power supply conflicts caused by simultaneous access.

[0049] 6.1 Interface locking and unlocking control in initial power-on state When the control system detects that the first voltage interface has been stably connected to the corresponding first power supply, and confirms through the first voltage detection module that the voltage value meets the 24V power supply standard, and the second voltage interface is not connected to any power supply, that is, when the second voltage detection module detects that the voltage is 0 or below the threshold, the control center outputs a lock command: Control the first voltage interface to be locked: fix the power supply channel between the first voltage interface and the power supply module through electronic locking device or logic locking circuit, ensure stable output of 24V low voltage power supply, and provide power to the screen and communication module (initial stage); Controlling the second voltage interface to be in the unlocked state: This removes the access restriction of the interface, allowing the subsequent access of the second power supply, while keeping the power supply channel between the second voltage interface and the communication module disconnected to avoid line no-load interference when there is no power supply access.

[0050] 6.2 Interface switching and channel control when a second power supply is connected When the first voltage interface is in the aforementioned locked state, if the second voltage detection module detects that the second voltage interface is connected to the corresponding second power supply and the voltage value meets the preset second voltage power supply range, the control center initiates an orderly switching process to avoid electrical conflicts caused by the simultaneous supply of two types of power supplies. In the specified scenario, the second power supply is connected in a preset maintenance or sleep mode. In this case, the first power supply is not required to power the LED; the second power supply only needs to provide basic self-test and communication functions to the LED wallpaper display.

[0051] Output a lock command to control the second voltage interface to switch to a locked state, fixing the power supply channel between the second power supply and the communication module in a ready-to-conduct state; After a preset delay time, such as 10ms, ensure that the second voltage interface is locked stably, output an unlock command, and switch the first voltage interface to the unlocked state. The power supply channel between the first voltage interface and the power supply module is cut off synchronously. This can be achieved by switching devices such as relays and MOSFETs, thereby stopping the first power supply from supplying power to the communication module. The second voltage interface is connected to the power supply channel of the communication module, and the second power supply provides a dedicated operating voltage for the communication module, thus completing the safe switching of the main power supply.

[0052] 6.3 Interface Reset and Channel Restoration After Second Power Supply Failure When the second voltage detection module detects that the second power supply meets the preset power failure state, such as when the voltage value suddenly drops to 0 and remains below the second voltage supply range threshold for more than 3 seconds, the control center initiates the reset and switching process: Immediately connect the power supply channel between the first voltage interface and the power supply module to restore the emergency power supply of 24V low voltage to the communication module, so as to avoid communication interruption and abnormal screen display. Output a lockout command to switch the first voltage interface back to the locked state, ensuring the stability of emergency power supply; After a preset delay, such as 5ms, ensure stable power supply from the first power source, output an unlock command, and switch the second voltage interface to the unlocked state. Disconnect the power supply channel between the second voltage interface and the communication module to avoid line interference in the power failure state, and wait for the second power supply to be reconnected or maintain the first power supply state.

[0053] In this embodiment, the locking and unlocking mechanism is implemented through an electronic locking circuit and a logic control unit. The switching devices are all miniaturized and low-power models, such as surface mount relays and miniature MOSFETs, to meet the ultra-thin and lightweight structural design requirements of the LED wallpaper display. The switching of the power supply channel adopts the "on first, off later" logic to avoid power supply gaps during the switching process and ensure the continuous and stable operation of the communication module and the screen.

[0054] Through the aforementioned dual-voltage interface locking and unlocking control and orderly switching logic of the power supply channel, the access priority and switching rules of the two types of low-voltage power supplies are clearly defined. From the electrical control level, this completely avoids abnormal problems such as power supply conflicts and voltage superposition caused by the simultaneous access of two power supplies. The switching process adopts the safety logic of "locking before switching and turning on before turning off" to ensure the continuity and stability of low-voltage power supply. At the same time, the locking and unlocking mechanism is adapted to the low-voltage driving characteristics, and the selection of switching devices meets the requirements of ultra-thin design. This further improves the safety, reliability and scenario adaptability of the power supply control of LED wallpaper displays, ensuring stable operation under complex working conditions such as multiple power supply access and power switching.

[0055] S7, Sub-step for accurately determining the compatibility between the second power supply and the second voltage interface To avoid the connection of an incompatible second power supply to the system with a voltage amplitude that is basically within the standard but has excessive ripple, violent fluctuations, and unstable output, which could lead to abnormal operation of the communication module, signal distortion, or even screen failure, this method adds a sub-step for dynamic quality judgment and compatibility verification of the second power supply, in addition to ensuring that the second voltage value meets the power supply range. The details are as follows: After the second voltage detection module determines that the second voltage value falls within the preset second voltage supply range, it does not directly determine the second power supply compatibility, but instead enters the power supply stability sampling cycle: The control system has a preset duration, which is 500ms in this embodiment. This duration can be adaptively adjusted according to the low voltage drive response requirements. Within this preset duration, multiple sets of real-time data of the second voltage are continuously collected at a fixed sampling frequency. Based on the collected voltage sequence, two indicators are calculated: 1. Calculate the fluctuation range of the second voltage value. The fluctuation amplitude is the difference between the maximum and minimum values ​​of the second voltage collected within a set time period. It is used to characterize the upper and lower fluctuation range of the second power supply output voltage and intuitively reflect the instantaneous stability of the voltage.

[0056] 2. Calculate the dispersion value of the second voltage value. The dispersion value is characterized by the mean square deviation or standard deviation of the voltage sequence, which reflects the discrete distribution of the voltage data relative to the mean, and reflects the long-term stability and ripple magnitude of the second power supply output.

[0057] After calculating the above indicators, the system performs normalization based on preset standard parameters: The ratio of the fluctuation amplitude to the preset reference amplitude is defined as the amplitude sub-item, where the reference amplitude is the maximum fluctuation threshold allowed by a qualified low-voltage communication power supply. The ratio of the dispersion value to the preset reference dispersion value is defined as the discrete sub-item, where the reference dispersion value is the maximum voltage dispersion threshold allowed by a qualified power supply.

[0058] The control system has built-in weighted operation logic, which performs a weighted summation of the amplitude sub-item and the discrete sub-item to obtain the corresponding item: corresponding item = k_1 × amplitude sub-item + k_2 × discrete sub-item; where k_1 and k_2 are preset weighting coefficients that satisfy k_1 + k_2 = 1, and can be adaptively configured according to the emphasis requirements of the low voltage drive system on fluctuation stability and discrete stability.

[0059] The system presets reference items as adaptation determination thresholds: If the calculated corresponding item is less than the reference item, it indicates that the second power supply has small fluctuations, low dispersion, and qualified output quality. It is determined that the second power supply is matched with the second voltage interface, and normal connection and power supply to the communication module are allowed. If the corresponding item is greater than or equal to the reference item, it indicates that the second power supply voltage fluctuation is too large, the ripple exceeds the standard, and the stability is insufficient. It is determined that the second power supply and the second voltage interface are mismatched. The control system locks the second voltage interface and prohibits the power supply from being connected to the communication module to avoid communication abnormalities, display distortions and other faults caused by power supply quality deterioration.

[0060] This embodiment uses a two-stage detection method—initial screening of amplitude range and precise judgment of dynamic stability—to overcome the limitations of traditional methods that rely solely on voltage amplitude. This enables accurate identification of the quality of low-voltage communication power supplies, and is especially suitable for 24V low-voltage driven, ultra-thin LED wallpaper displays. It can effectively prevent interference and damage to communication lines and control modules caused by inferior or incompatible power supplies.

[0061] By analyzing the fluctuation amplitude and dispersion of the second voltage within a set time period, and using weighted calculation and threshold comparison for adaptation determination, a quantitative and accurate assessment of the stability of the second power supply output is achieved. This overcomes the problem that simply detecting the voltage amplitude cannot identify hidden defects such as power supply ripple and instantaneous fluctuations. It can effectively eliminate unsuitable power supplies with large fluctuations and poor stability, thus avoiding communication failures and display abnormalities caused by poor power supply quality from the source. This further ensures the power supply reliability of the low-voltage drive system and improves the communication transmission and overall working stability of the LED wallpaper display screen.

[0062] S8. Calculation of average value of corresponding terms in multiple cycles and dynamic adjustment of the second voltage supply range Based on the single-set duration adaptability determination, a multi-cycle data statistics and dynamic range adjustment mechanism is introduced. Combined with the first power supply connection status, the adaptive optimization of the second voltage supply range is achieved. The specific steps are as follows: 8.1 Collection of corresponding terms and calculation of average terms for multiple periods The control system presets a threshold number of cycles, which is set to 3 cycles in this embodiment. This can be adjusted to 2-5 cycles depending on the stability requirements of the low-voltage drive system. The duration of each cycle is the "set duration" mentioned earlier, i.e., 500ms. After continuously completing multiple set duration power stability sampling and corresponding calculations: Automatically extract the adaptability judgment result corresponding to each set duration, that is, the "corresponding item" calculated in step S7, and form multiple sets of corresponding item data sequences; The arithmetic mean algorithm is used to calculate the average of the data sequence, which is defined as the corresponding average term, as shown in the following formula: The average corresponding term = (corresponding term 1 + corresponding term 2 + ... + corresponding term n) / n, where n is the preset threshold for the number of periods; During the calculation process, abnormal extreme values, such as values ​​exceeding three times the normal range of the corresponding item, are automatically removed to avoid interference from single abnormal sampling data on the average result and to ensure that the corresponding average item can objectively reflect the long-term output stability of the second power supply.

[0063] 8.2 Triggering conditions and judgment logic for dynamic adjustment The adjustment mechanism requires the following prerequisites to be met: the first voltage interface is stably connected to the first power supply, and the first voltage detection module continuously monitors and confirms that the 24V low-voltage power supply is normal, without any power loss or fluctuation. The purpose of this prerequisite design is to ensure that the first power supply serves as a backup for the main power supply, so that even if there are brief fluctuations in the adaptation judgment during the adjustment of the second voltage power supply range, the first power supply can still guarantee the continuous power supply to the communication module and the screen, avoiding power interruption caused by the adjustment process.

[0064] If the first voltage interface is not connected to the first power supply and only the second power supply provides independent power, then the dynamic adjustment function of this step is paused, the initially set second voltage power supply range is maintained, the power supply continuity is prioritized, and unnecessary power supply connection lockout is avoided due to range adjustment.

[0065] 8.3 Negative Correlation Adjustment Rules for the Second Voltage Supply Range In this embodiment, the dynamic adjustment of the second voltage supply range follows a negative correlation logic, that is, the corresponding average term is inversely related to the size of the supply range. The specific adjustment rules are as follows: The initial second voltage supply range is preset, such as 12V±0.5V, to adapt to the standard operating voltage of the communication module. At the same time, the upper and lower limits of the range adjustment are set. The upper limit does not exceed +10% of the initial range, and the lower limit is not lower than -10% of the initial range to avoid excessive adjustment that may exceed the voltage tolerance threshold of the communication module. The smaller the corresponding average term, the better the multi-cycle output stability of the second power supply, the lower the fluctuation and dispersion, and the better the power supply quality. At this time, the second voltage supply range is reduced by a preset adjustment step size (set to 5% in this embodiment). For example, the initial range of 12V±0.5V can be reduced to 12V±0.45V to increase the power supply adaptation threshold, further screen high-quality power supplies, and reduce the risk of low-quality power supply access. If the corresponding average term is larger, it indicates that the long-term stability deviation, fluctuation, or dispersion of the second power supply is too high, but it has not reached the non-fitness judgment threshold; otherwise, it has already been blocked in step S7. At this time, the second voltage supply range is expanded by the same adjustment step size, for example, from 12V±0.5V to 12V±0.55V, to avoid misjudging it as a non-fit power supply due to short-term fluctuations and to improve the anti-interference capability of the fit judgment. After each adjustment, the power supply range is maintained until the next round of multi-cycle corresponding item collection and average calculation is completed, and then the next dynamic adjustment is carried out to form a closed-loop regulation mechanism.

[0066] 8.4 Adjustment Constraints and Adaptation Guarantees During the adjustment process, the control system monitors the operating status of the communication module and the stability of the second voltage in real time. If the second voltage value remains stable within the new power supply range after adjustment, and the communication module shows no signal distortion and the display is normal, then the adjustment is confirmed to be effective. If, after adjustment, the second voltage frequently approaches the range boundary or the communication signal fluctuates, the adjustment is paused and the system is reverted to the previous effective range to avoid over-adjustment affecting system stability. All adjustment logic is implemented through software algorithms, without the need for additional hardware modules, adapting to the ultra-thin, low-power structure and driving requirements of LED wallpaper displays.

[0067] By calculating the average of corresponding terms over multiple periods, random interference from a single sampling is effectively smoothed out, making power supply stability assessment more objective and accurate. Combined with the triggering conditions of the first power supply connection state, the continuity and safety of power supply during dynamic adjustment are ensured. A negative correlation adjustment rule is adopted to achieve adaptive optimization of the second voltage supply range. This mechanism raises the compatibility threshold for high-quality power supplies while relaxing the judgment range for power supplies with slightly lower stability but still meeting requirements, achieving a balance between precise selection and anti-interference capability. This mechanism further improves the accuracy of power supply compatibility judgment for low-voltage drive systems, enhances anti-interference capability under complex operating conditions, and ensures stable and reliable power supply.

[0068] S9, Multi-point temperature monitoring and graded overheat protection control To address the issues of limited heat dissipation space and heat accumulation during long-term operation in ultra-thin structures, an overheat protection mechanism with multi-point temperature measurement, weighted calculation, and graded response is designed, which is linked to dual power supply switching logic to achieve active protection. The specific steps are as follows: 9.1 Temperature Sensor Deployment and Data Acquisition Multiple miniature temperature sensors are deployed in the core heat-generating areas and key operating parts of the LED wallpaper display screen to meet the requirements of ultra-thin and lightweight structural design. Sensor selection: Use surface-mount NTC thermistors or digital temperature sensors, such as DS18B20, with a size ≤3mm×3mm, thickness ≤0.8mm, low power consumption, operating current ≤10μA, and compatibility with 24V low-voltage power supply. Deployment location: A total of 4-6 sensors are set up, located directly above the power supply module (1, with the highest weight), near the communication module (1), in the center of the screen (1), and at the four corners of the screen (2-3), covering the main heat points and temperature equalization areas; Data acquisition logic: The sensor communicates with the control center via I2C or a single bus, with a data acquisition frequency of 1 time / second to avoid increasing power consumption due to high-frequency acquisition. The acquired data is transmitted to the control center for storage in real time.

[0069] 9.2 Weighted Calculation of Display Screen Temperature Values The control center performs a weighted summation of multiple sets of temperature data to obtain the display screen temperature value that reflects the overall temperature status of the screen. The logic is as follows: Weight allocation basis: The weights are set according to the heat intensity and temperature influence range of each location. The weight of the sensor near the power supply module is k1=0.3 (core heat source), the weight of the sensor near the communication module is k2=0.2 (secondary heat source), the weight of the center of the screen is k3=0.2, and the weight of the four corner sensors is k4-k6=0.1 (better heat dissipation at the edges), satisfying k1+k2+k3+k4+...+kn=1; Calculation formula: Display temperature T = k1×T1 + k2×T2 + k3×T3 + ... + kn×Tn, where T1-Tn are the real-time temperature data collected by each sensor; Data preprocessing: The collected data is first filtered by moving average, and the average of 5 collections is taken to remove outliers caused by instantaneous interference, such as data that exceed the normal temperature range by 3 times, to ensure the authenticity of the temperature values.

[0070] 9.3 Temperature rise time and status determination The control system has a preset reference temperature value, which is set to 60℃ in this embodiment. This can be adjusted to 55-65℃ depending on the temperature tolerance of the LED devices. The timing logic is then initiated based on the display screen's temperature value. Timing trigger: If T > reference temperature value, the control center starts the built-in timer to accumulate the temperature rise time t1, with a timing accuracy of 100ms; Timing initialization: If T≤reference temperature value, immediately clear the temperature rise time t1 to zero and wait for triggering again to avoid misjudgment caused by a brief drop in temperature; Timing constraint: The maximum cumulative duration of the timer is 30 minutes. It will automatically reset after exceeding this time to prevent unresponsiveness under prolonged high temperatures.

[0071] 9.4 Graded Overheating Treatment Logic When the temperature rise time t1 > the preset first reference time, in this embodiment, the preset first reference time is set to 30 seconds, which can be adjusted to 15-60 seconds to adapt to different heat dissipation scenarios. The control center starts the graded processing procedure and first obtains the real-time connection status of the first voltage interface and the second voltage interface: 9.4.1 Scenario 1: No second power supply (first lock, second unlock) If the first voltage interface is detected to be locked and the second voltage interface is detected to be unlocked, and no second power supply is connected, the control system cannot perform power switching and will immediately generate an over-temperature warning. Warning method: The control center outputs a low-level signal, which triggers the flashing of the miniature LED indicator (low power consumption) built into the edge of the screen. At the same time, it pushes a warning message to the associated mobile terminal APP through the communication module, such as "The display temperature is too high. Please check the heat dissipation environment." Additional action: Maintain the current power supply while reducing screen brightness, such as from 100% to 70%, to reduce power consumption and heat generation, and assist in cooling.

[0072] 9.4.2 Scenario 2: A second power supply is connected (the second power supply is already adapted) If the second voltage interface is detected to be connected to the corresponding second power supply, the system determines compatibility via step S7, initiates the power switching and cooling process, and connects to the dual power supply switching logic in step S6: Following the "lock before switch" rule, the second voltage interface is first switched to a locked state to ensure switching stability. After a 10ms delay, the first voltage interface is switched to the unlocked state, cutting off the power supply channel between the first voltage interface and the power supply module. The first power supply is the main heat source, and cutting it off can reduce the core heat generation. The power supply channel between the second voltage interface and the communication module is maintained, and the communication module is powered by the second power supply, which has lower power and lower heat generation. Start a timer t2 to record the duration of power switching and the continuous working time after switching.

[0073] 9.4.3 Scenario 3: Temperature does not decrease after power switching If the power switching time t2 is greater than the preset second reference time (60 seconds in this embodiment, adjustable to 30-120 seconds), and the displayed temperature value is still greater than the reference temperature value, the temperature rise time t1 has not been initialized, indicating that simply switching the power supply cannot cool the temperature. The control system generates an overheating alarm. Alarm method: The built-in miniature buzzer (low power consumption) of the start screen emits an intermittent alarm sound, while the LED indicator light stays on, and the APP pushes emergency alarm information (including real-time temperature data). Emergency Action: Automatically cuts off power to non-core display areas of the screen (such as edge areas), retaining only the core display content to further reduce heat generation; if the temperature does not drop within the next 10 seconds, it triggers the whole machine power-off protection to prevent components from burning out.

[0074] 9.5 Protection Mechanism Reset Conditions When the display temperature drops below the reference temperature for a duration of ≥10 seconds, the control system automatically resets. Reset the temperature rise time t1 to zero, and reset the power supply replacement time t2 to zero; When the warning / alarm status is cleared, the indicator light goes out and the buzzer stops. If a power switch was performed previously, users can choose whether to restore the first power supply or maintain the second power supply, depending on their settings (the default is not to automatically switch back to the first power supply). The screen brightness was restored to the level before the switchover, and power supply to non-core areas was restored.

[0075] This embodiment utilizes miniaturized, low-power multi-point temperature sensors, combined with a weighted algorithm, to accurately acquire the overall temperature of the screen, avoiding the limitations of single-point temperature measurement. It employs a graded judgment of overheating conditions based on temperature rise time, preventing false triggering of protection due to instantaneous high temperatures. A dual-power switching logic is integrated to actively cool the screen by cutting off the high-power heat source (first power supply). A tiered protection system with early warning, alarm, and emergency power-off mechanisms is designed to ensure the continuous operation of the low-voltage drive system while effectively preventing device damage caused by overheating. All hardware selections and control logic are adapted to the ultra-thin, low-power structure and driving requirements of the LED wallpaper display screen, significantly improving the accuracy, responsiveness, and operational safety of the display screen's overheat protection.

[0076] S10, Interlocking switching control between low-voltage power supply line and communication unit As an optional preferred embodiment of this application to optimize line connection security and avoid cross-connection interference, a collaborative switching mechanism based on interlocking markers and physical switches is designed to address the connection reliability problem in scenarios where power supply and communication lines are reused under low voltage drive, thereby achieving precise line connection and isolation. The specific steps are as follows: 10.1 Configuration of low-voltage power supply lines and physical connection switches The main power supply line inside the power supply area adopts a 24V low-voltage power supply line. This line is the core power supply path for the panel and power supply module, and has the characteristics of low loss and anti-interference wiring, such as using shielded cables and wire diameter adapted to the 24V high current transmission requirements.

[0077] The low-voltage power supply line establishes a switchable electrical connection with the communication write unit and communication read unit in the data extraction submodule through a preset physical connection switch: Physical connection switch selection: Surface mount double-pole double-throw miniature relays or MOSFET arrays are adopted, with a size ≤5mm×5mm and a thickness ≤1mm, which is suitable for the ultra-thin structure design of LED wallpaper displays; the rated voltage of the switch is ≥30V and the rated current is ≥1A, which meets the 24V low-voltage power supply transmission requirements, and the switching response time is ≤5ms to ensure timely line switching. Connection topology: The physical connection switch is equipped with a common terminal, a normally closed terminal, and a normally open terminal. The common terminal is electrically connected to the power supply input terminals of the communication write unit and the communication read unit, respectively. The normally closed terminal is connected to the low-voltage power supply line, and the normally open terminal is left floating or connected to the system ground. The connection state is switched by switching the switch contacts.

[0078] 10.2 Logic for Generating and Clearing Interlock Marks Based on the real-time status of the first and second voltage interfaces, the control system dynamically generates or clears interlock flags. These software-level logical identifiers are stored in the control center register. Tag generation conditions: When the first voltage interface is in the unlocked state, without power supply or in standby state, and the second voltage interface is in the locked state, the second power supply is stably connected and supplies power to the communication module. The control center automatically generates an interlock tag, and the tag status is "valid". Mark clearing conditions: If any of the above interface states change, such as the first voltage interface switching to the locked state, the second voltage interface being unlocked or losing power, the control center will immediately clear the interlock mark, and the mark state will change to "invalid". Tag verification mechanism: The consistency between the interface status and the interlock tag is verified every 100ms. If a mismatch occurs, such as the interface status meeting the generation conditions but the tag not being generated, a logic reset is triggered to resynchronize the tag and interface status to avoid accidental switching.

[0079] 10.3 Line switching control based on interlocking tags When the interlock flag is in the "valid" state, the control system initiates the line switching process to achieve precise connection between the communication unit and the low-voltage power supply line: The control center outputs a switching command to the physical connection switch, driving the switch contacts to switch from the normally open end to the normally closed end. The power input terminal of the communication writing unit is connected to the low-voltage power supply line through the common terminal of the physical connection switch to obtain 24V low-voltage power supply, ensuring the power supply for the communication data writing operation; The power input terminal of the communication reading unit is synchronously connected to the low-voltage power supply line through a physical connection switch, so as to realize the coordinated power supply support for low-voltage power supply and communication data reading; After the switch is completed, the control center detects the contact position of the physical connection switch through the feedback pin. After confirming that the conduction state is correct, the connection relationship after the switch is maintained.

[0080] 10.4 Switch Status Management After Interlock Marking When the interlock flag is cleared, i.e., the status changes to "invalid", the control system immediately performs a line isolation operation: Output a disconnect command to drive the physical connection switch contacts to switch from the normally closed end back to the normally open end, cutting off the electrical connection between the communication write unit, the communication read unit and the low-voltage power supply line; After the physical connection switch is switched to the normally open position, the power supply input terminals of the communication write unit and the communication read unit automatically switch back to the second voltage interface power supply path and are powered by the locked second power supply to avoid power interruption. After the switch is turned off, the control center continuously monitors the contact status to ensure that it is in a high-impedance isolation state, preventing signal interference or voltage conflict caused by mis-connection between the low-voltage power supply line and the communication line.

[0081] In this embodiment, the switching logic of the physical connection switch and the interlocking mark form a hardware and software interlock: the switch can only conduct the low-voltage power supply line when the interlocking mark is valid; when the mark is invalid, the switch is forcibly disconnected and locked to the normally open terminal, thus eliminating the risk of mixed wiring from a mechanism perspective. At the same time, the switch drive circuit adopts a low-power design with a static current ≤20μA, which meets the low-power requirements of LED wallpaper displays.

[0082] Through the coordinated control of interlocking markers and physical connection switches, precise interlocking switching between low-voltage power supply lines and communication read / write units is achieved. This ensures stable power supply to the communication unit under specific operating conditions (second power supply locked), while structurally avoiding interference and voltage conflicts between power supply lines and communication lines. The physical connection switches are selected to adapt to an ultra-thin design, with rapid switching response and low power consumption. The hardware and software interlocking mechanism further enhances the safety and reliability of line switching. This solution effectively optimizes the orderliness of line connections under low-voltage drive, reduces the impact of electromagnetic interference on communication signals, and further ensures signal transmission stability and power supply safety.

[0083] S11. Line Status Adaptive Detection and Dynamic Compensation Control for Communication Voltage To address the limitations of communication line wiring and the susceptibility of transmission loss to line parameters in the ultra-thin structure of LED wallpaper displays, a closed-loop control mechanism based on line status detection, parameter calculation, and adaptive voltage compensation is designed to ensure signal transmission quality under different line operating conditions. The specific steps are as follows: 11.1 Obtaining Line Status and Configuring Preset Line Database 11.1.1 Line Status Acquisition Scheme A miniature line status detection module is integrated into the communication power supply line between the communication write unit and the communication read unit, adapting to an ultra-thin and lightweight structural design. Detection module selection: adopts an integrated line parameter acquisition chip, with a size ≤4mm×4mm, thickness ≤0.6mm, compatible with 24V low voltage power supply, and operating power consumption ≤50μA. It supports online detection of core parameters such as line continuity status and transmission attenuation characteristics. The parameters collected include four categories of line status: "normal conduction", "slight attenuation", "moderate attenuation" and "fault open circuit". The collected indicators cover line continuity, signal transmission delay, equivalent impedance, etc. The sampling frequency is 1 time / 5 seconds to balance detection accuracy and power consumption. Acquisition logic: The detection module acquires the current signal through the sampling resistor connected in series in the communication line, and obtains the voltage difference between the two ends of the line by combining the voltage sampling circuit. After analog-to-digital conversion (ADC), the data is transmitted to the control center, which determines the line status.

[0084] 11.1.2 Construction of Preset Line Database The control center has a built-in non-volatile line database stored in on-chip flash memory, occupying ≤10KB of space. The database pre-stores the mapping relationship between different line states and corresponding line parameters, as detailed below: Storage content: The "line length" and "line impedance value" are stored according to the line status. The line length is the actual wiring length between the communication write unit and the read unit (unit: m), and the line impedance value is the equivalent series impedance of the line (unit: Ω). It covers the standard parameters calibrated by the factory and the dynamically updated actual operating parameters. Calibration mechanism: Before leaving the factory, the line parameters are calibrated for different wiring scenarios (such as screen size 2m×1m, 3m×2m, etc.), and the standard length and standard impedance are entered into the database; during operation, if a change in line status is detected and remains stable for 3 acquisition cycles, the corresponding entry in the database is automatically updated to realize dynamic parameter iteration. Indexing rules: Using "line status code" as the index key, the corresponding line length and impedance value are quickly matched and extracted. The query response time is ≤1ms, ensuring real-time compensation requirements.

[0085] 11.2 Solving for Calculated Length and Impedance Values After extracting parameters based on the collected line status data, the control center performs normalization calculations to obtain indicators that quantitatively characterize line transmission loss: 11.2.1 Definition of Preset Reference Parameters Preset reference length L0: Select the standard length for common wiring scenarios of LED wallpaper displays. In this embodiment, it is set to 1.5m, which can be adjusted to 1-2m according to the mainstream product size, that is, the ideal length where the line transmission loss can be ignored. Preset reference impedance value Z0: The standard value of the characteristic impedance of the communication power supply line. In this embodiment, it is set to 50Ω, which meets the impedance matching requirements of low-voltage differential signal transmission.

[0086] 11.2.2 Calculation Logic and Formulas Length calculation value K1: Calculated using the normalized ratio of the actual line length to the reference length, using the following formula: K1 = L / L0, where L is the actual line length extracted from the database; If L > L0 and K1 > 1, it indicates that the transmission loss is increased due to the excessive length of the line; if L ≤ L0 and K1 ≤ 1, it indicates that the loss is relatively small.

[0087] Impedance calculation value K2: Calculated using the normalized ratio of the actual line impedance value to the reference impedance value, using the following formula: K2 = Z / Z0, where Z is the actual line impedance value extracted from the database; If Z > Z0 and K2 > 1, it indicates that the line impedance is too large (such as aging wiring or poor contact) leading to increased loss; if Z ≤ Z0 and K2 ≤ 1, it indicates that the impedance matching is good.

[0088] 11.3 Voltage Regulation Value Calculation and Dynamic Compensation for Communication Voltage 11.3.1 Weighted Calculation of Voltage Regulation Values The control center performs a weighted summation based on K1 and K2 to obtain the quantitative index of communication voltage compensation; the voltage regulation value ΔU, the specific logic is as follows: Weighting coefficient setting: The weighting coefficients are assigned according to the influence of line parameters on transmission loss. The weight of length influence is a=0.6, since length is the dominant factor in loss. The weight of impedance influence is b=0.4, satisfying a+b=1. Calculation formula: ΔU=U0×(a×K1+b×K2-1), where U0 is the reference voltage value of communication data, which is set to 3.3V in this embodiment to match the logic level of the communication module; Constraints: The value of ΔU is in the range of 0-0.8V to avoid over-adjustment that could cause communication signal distortion. The upper limit is no more than 20% of the voltage withstand of the communication module. If the calculation result exceeds the range, the boundary value will be locked.

[0089] 11.3.2 Positive Correlation Adjustment of Communication Data Voltage The control center dynamically compensates for the communication data voltage output by the communication write unit based on the voltage adjustment value ΔU. Adjustment logic: The final value of the communication data voltage U=U0+ΔU, realizing the positive correlation compensation that "the larger the adjustment value, the higher the communication voltage", accurately offsetting the transmission loss caused by excessive line length and high impedance; Regulation execution: Voltage regulation is achieved by controlling the digital-to-analog converter (DAC) module or programmable gain amplifier inside the communication write unit. The adjustment step size is 0.01V and the response time is ≤2ms to ensure timely compensation. Feedback verification: After adjustment, the signal amplitude of the receiving end of the communication reading unit is collected by the line status detection module. If the amplitude does not reach the standard range (U0±0.1V), ΔU is iteratively adjusted until the requirements are met, forming a closed-loop compensation.

[0090] 11.4 Special Working Conditions Handling If the line status is determined to be "faulty open circuit", the control center will not perform voltage regulation, but will immediately generate a line fault alarm signal and push it to the terminal through the communication module, while maintaining the reference voltage U0 output to avoid ineffective regulation; If the line length and impedance value continue to fluctuate (change ≥ 3 times within 10 seconds), activate the smooth adjustment mode and take the average value of 5 ΔU values ​​as the adjustment basis to avoid signal jitter caused by frequent voltage fluctuations.

[0091] This embodiment utilizes a miniaturized, low-power line status detection module to achieve real-time and accurate acquisition of communication line parameters. Combined with a pre-set database, it quickly matches line length and impedance. Through normalization calculation and weighted accounting, it quantifies transmission loss and generates adaptive voltage adjustment values, positively compensating for communication data voltage and effectively offsetting transmission attenuation caused by changes in line length and impedance. The compensation process employs a closed-loop control and constraint mechanism to avoid signal distortion, and requires no additional hardware costs; it can be implemented through software algorithms, perfectly adapting to the ultra-thin, low-voltage driving structure and requirements of LED wallpaper displays. This mechanism ensures stable transmission quality of communication signals under different wiring lengths and impedance conditions, significantly improving the communication anti-interference capability and scene adaptability of the low-voltage driving system, further guaranteeing the consistency and reliability of the display screen's display effect.

[0092] This application also discloses a control system for a low-voltage driven LED wallpaper display screen, including a processor that executes the steps of the control method for the low-voltage driven LED wallpaper display screen as described in any of the above embodiments.

[0093] This application also discloses a medium storing a program, which, when executed by a processor, implements the steps of the control method for the low-voltage driven LED wallpaper display screen described in any of the above embodiments.

[0094] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A control method of a low-voltage driven LED wallpaper display screen, characterized in that, Includes the following steps: A power supply area and a communication area are set up behind the display screen. The power supply area is used to set up the power supply module, which is connected to a first voltage interface. The power supply area is equipped with a shielding layer to separate the display screen and the power supply area. A shielding isolation module is set around the power supply area or the communication area to isolate the power supply area or the communication area. The communication area is used to set up the communication module, which is connected to a second voltage interface through a communication power supply line. The connection status of the first voltage interface is detected by the preset first voltage detection module; if the first voltage interface is in the preset first voltage power supply state, the shielding and isolation module is activated, the power supply module supplies power to the communication module, and outputs the second voltage; If the first voltage interface is in a preset first voltage de-energized state, then the shielding and isolation module will be turned off. The second voltage detection module detects the voltage value of the second voltage interface based on the preset second voltage detection module. If the second voltage value is within the preset second voltage power supply range, the data extraction submodule is activated. The data extraction submodule includes a communication interface, a communication writing unit, and a communication reading unit that are electrically connected in sequence. The communication interface and the communication writing unit are located next to the second voltage interface. The communication writing unit is electrically connected to the communication power supply line. The communication writing unit writes the communication data received through the communication interface onto the communication power supply line. The communication reading unit is connected in series between the communication power supply line and the control center of the communication module. It is used to supply power to the control center and read the communication data on the communication power supply line and send it to the control center. Among them, the voltage value when the communication power supply line carries communication data is lower than the voltage value within the second voltage power supply range.

2. The control method of a low-voltage driven LED wallpaper display screen according to claim 1, characterized in that, The method also includes the following steps: The shielding and isolation module includes a metal enclosure surrounding the power supply area or communication area and a controlled switch; The controlled switch is connected to the control center in a controlled manner, and the control center changes the operating state of the controlled switch in response to the isolation command; When the controlled switch is in the execution state, the metal enclosure is closed and / or reaches the set potential; when the controlled switch is in the non-execution state, the metal enclosure is open and / or in a high-resistance state.

3. The control method of a low-voltage driven LED wallpaper display screen according to claim 1, characterized in that, The method also includes the following steps: When the first voltage interface is connected to the corresponding first power supply and the second voltage interface is not connected to the corresponding second power supply, the first voltage interface is locked and the second voltage interface is unlocked. When the first voltage interface is in a locked state, if the second voltage interface is connected to the corresponding second power supply, the second voltage interface is first controlled to switch to a locked state, then the first voltage interface is switched to an unlocked state, and the power supply channel between the first voltage interface and the power supply module is cut off. When the second power source meets the preset power-off state, the power supply channel between the first voltage interface and the power supply module is turned on, the first voltage interface is switched to a locked state, the second voltage interface is switched to an unlocked state, and the power supply channel between the second voltage interface and the communication module is turned off.

4. The control method for a low-voltage driven LED wallpaper display screen according to claim 1, characterized in that, The second voltage interface is connected to the corresponding second power supply, and the following sub-steps are also included: If the second voltage value is within the second voltage power supply range, calculate the fluctuation range and dispersion value of the second voltage value within a preset set time period; The ratio of the fluctuation amplitude to the preset reference amplitude is calculated as the amplitude sub-item, and the ratio of the fluctuation degree value to the preset reference discrete value is calculated as the discrete sub-item. The corresponding term is calculated by weighting the amplitude sub-term and the discrete sub-term. If the corresponding term is less than the preset reference term, then the second power supply corresponds to the second voltage interface; otherwise, the second power supply does not correspond to the second voltage interface.

5. The control method for a low-voltage driven LED wallpaper display screen according to claim 4, characterized in that, The method also includes the following steps: After multiple set durations, obtain the corresponding items for the multiple set durations, and calculate the average of the multiple corresponding items as the corresponding average item; If the first voltage interface is connected to the first power supply, the range of the second voltage supply range is adjusted according to the negative correlation of the corresponding average term.

6. The control method for a low-voltage driven LED wallpaper display screen according to claim 3, characterized in that, The method also includes the following steps: Multiple temperature sensors are installed on the LED wallpaper display screen. The temperature sensors are used to collect the temperature of the corresponding parts of the LED wallpaper display screen and generate temperature data. The display screen temperature value is calculated by weighting multiple temperature data. If the temperature displayed on the screen is greater than the preset reference temperature, the timer will start to measure the duration of the temperature rise. Otherwise, initialize the temperature rise time; If the temperature rise time exceeds the preset first reference time, then obtain the connection status of the first voltage interface and the second voltage interface; If the first voltage interface is locked and the second voltage interface is unlocked, an over-temperature warning will be generated. If the second voltage interface is connected to a corresponding second power supply, the second voltage interface is first controlled to switch to the locked state, then the first voltage interface is switched to the unlocked state, and the power supply channel between the first voltage interface and the power supply module is cut off. Then the timer is used to obtain the power supply replacement time. If the power supply replacement time exceeds the preset second reference time and the temperature rise time has not been initialized, an over-temperature alarm will be generated.

7. The control method for a low-voltage driven LED wallpaper display screen according to claim 3, characterized in that, The method also includes the following steps: The main power supply line in the power supply area is a low-voltage power supply line, which is electrically connected to the communication writing unit and the communication reading unit through a preset physical connection switch; If the first voltage interface is in the unlocked state and the second voltage interface is in the locked state, an interlock mark is generated; Otherwise, clear the interlock marker; Based on the interlocking mark, both the communication write unit and the communication read unit are switched to be connected to the low-voltage power supply line via a physical connection switch; after the interlocking mark is set, the physical connection switch is disconnected.

8. The control method for a low-voltage driven LED wallpaper display screen according to claim 7, characterized in that, The method also includes the following steps: Obtain the line status between the communication write unit and the communication read unit; The line length and line impedance values ​​are extracted from a preset line database based on the line status. The length is calculated based on the line length and the preset reference length, and the impedance is calculated based on the line impedance and the preset reference impedance. The voltage adjustment value is calculated by weighting the length and impedance values, and the voltage value corresponding to the communication data is adjusted according to the positive correlation of the voltage adjustment value.

9. A control system for a low-voltage driven LED wallpaper display screen, characterized in that, The device includes a processor that performs the steps of the control method for a low-voltage driven LED wallpaper display screen as described in any one of claims 1-8.

10. A computer-readable storage medium, characterized in that, The medium stores a program that, when executed by a processor, implements the steps of the control method for the low-voltage driven LED wallpaper display screen as described in any one of claims 1-8.

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