Distributed LED screen cooperative control system based on wireless synchronization protocol

Abstract

The application relates to the technical field of distributed control, and particularly discloses a distributed LED screen cooperative control system based on a wireless synchronization protocol, which comprises the following modules: a division module: the transmission bandwidth and the average value of each LED display screen are acquired, the LED display screen with the maximum average value is recorded as a master screen, and the rest are recorded as sub-screens; a detection module: a synchronization signal is sent, the time when the synchronization signal is received is recorded, a time stamp is sent to the sub-screens, and the direction conversion is resent; an adjustment module: a limit condition is generated, the network delay and the clock deviation are calculated, the clock of the sub-screens is adjusted based on the clock deviation, the fluctuating sub-screens are screened out, the delay prediction value is calculated based on the network delay, the frame data is sent in advance, the picture difference between the master screen and the fluctuating sub-screens is acquired, and the delay prediction value is adjusted. The application solves the high delay problem when high dynamic display content is faced through the synchronization clock signal and the method of early transmission, thereby reducing the delay.

Description

Technical Field

[0001] This invention relates to the field of distributed control technology, and more specifically to a distributed LED screen collaborative control system based on a wireless synchronization protocol. Background Technology

[0002] Distributed LED screen collaborative control refers to a technical system that connects multiple LED displays through a network to achieve unified management, synchronized display, and collaborative operation. This technology is widely used in large-scale advertising displays, stage backdrops, command and dispatch centers, and other scenarios.

[0003] Current LED display management systems generally employ the TCP / IP protocol suite to implement a hybrid networking architecture of wired Ethernet and wireless Wi-Fi when constructing control networks, and improve reliability through network redundancy and failover mechanisms. However, existing systems still have significant shortcomings in data transmission and content updates. On the one hand, traditional centralized control-based display content update and fault monitoring mechanisms are difficult to adapt to the heterogeneous protocols of multi-brand devices in a distributed environment, causing difficulties in inter-device collaboration. On the other hand, resource scheduling strategies mostly use static rules, lacking the ability to respond to real-time load fluctuations and dynamic priority adjustments, resulting in persistently high latency. Particularly prominent is the high latency issue in the compression and transmission stage of existing video processing workflows, especially when dealing with highly dynamic display content, where efficient video stream compression and high-quality display output are both impossible. These systemic defects make efficient multi-device collaboration, dynamic resource optimization, and real-time fault detection serious obstacles in the field of LED display management. Summary of the Invention

[0004] The purpose of this invention is to provide a distributed LED screen collaborative control system based on a wireless synchronization protocol, thereby solving the above-mentioned technical problems.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A distributed LED screen collaborative control system based on a wireless synchronization protocol includes:

[0007] Module division: Obtain the transmission bandwidth K of each LED display screen and the corresponding average transmission bandwidth K. ave , the mean K ave The largest LED display screen is designated as the main screen, and the remaining LED display screens are designated as sub-screens. The transmission bandwidth K represents the bandwidth used for video transmission.

[0008] Detection module: The main screen sends a synchronization signal to the sub-screen, and the sub-screen records the time t2 when it receives the synchronization signal. After a preset time, the main screen sends a timestamp t1 to the sub-screen. The timestamp refers to the time when the synchronization signal is sent.

[0009] When the sub-screen receives the timestamp, it sends a synchronization signal to the main screen. The main screen records the time t4 when it receives the synchronization signal, and after a preset time, it instructs the sub-screen to send the timestamp t3 to the main screen.

[0010] Adjustment module: Generate limit conditions The network latency D and clock skew F are calculated, and the clock of the sub-screen is adjusted based on the clock skew F.

[0011] Subscreens with network latency D > μ are marked. When the same subscreen is marked N ≥ 5 times, it is called a fluctuating subscreen. Here, μ represents the preset network latency threshold. The latency prediction value Y is calculated based on the network latency D.

[0012] Send frame data to the undulating sub-screen in advance (Y), and obtain the frame difference C between the main screen and the undulating sub-screen at this time. If the frame difference C > C max Increase the delayed prediction value Y by y until the image difference C ≤ C max Wherein, the corresponding frame difference C represents the interval between the playback time of the same frame on the main screen and the fluctuating sub-screen, C max y represents the preset image difference threshold, and y represents the preset unit time.

[0013] As a further aspect of the present invention: in the aforementioned partitioning module, the playback progress of the sub-screen is prohibited from exceeding that of the main screen.

[0014] As a further aspect of the present invention, it includes:

[0015] Calculate the total bandwidth K used for video transmission. When the total bandwidth K is greater than the maximum bandwidth of the channel, notify the staff that there is a video delay.

[0016] As a further aspect of the present invention: the adjustment module includes:

[0017] A pre-set detection period T is used, and the network latency and clock skew F are recalculated every detection period T.

[0018] As a further aspect of the present invention: in the detection module, if the sub-screen still does not receive a synchronization signal after a preset judgment time, a prompt message is sent to indicate a transmission line fault.

[0019] As a further aspect of the present invention: in the adjustment module, the unit time y < C max .

[0020] As a further aspect of the present invention: in the adjustment module, the method for calculating the delay prediction value Y based on the network delay D includes:

[0021] Calculate the predicted delay value , where D nThis represents the network latency when the subscreen is marked for the nth time.

[0022] As a further aspect of the present invention: in the adjustment module, the method for adjusting the clock of the sub-screen based on the clock deviation F includes:

[0023] When F=0, stop adjusting the clock of the sub-screen;

[0024] When F > 0, slow down the clock of the sub-screen by F time units;

[0025] When F < 0, advance the clock of the sub-screen by F time units.

[0026] The beneficial effects of this invention are as follows: The LED display synchronous control system adopts a modular design and achieves precise synchronization through three core modules: dynamic division of master and slave screens, bidirectional time synchronization detection, and intelligent delay compensation.

[0027] First, the system automatically detects the real-time video transmission bandwidth of each display screen, designating the screen with the highest average bandwidth as the main screen and the rest as sub-screens. The purpose of identifying the main screen here is to set a target for subsequent adjustments and avoid blind adjustments. Then, through bidirectional signal interaction between the main and sub-screens, the main screen sends a synchronization signal and returns a timestamp; the sub-screens respond by sending their own synchronization signal and corresponding timestamp, thus accurately measuring network latency and clock deviation. The system automatically calibrates the sub-screen clocks based on the measurement results and marks sub-screens with excessive network latency. Five consecutive instances of exceeding the latency limit indicate a fluctuating sub-screen.

[0028] To address these fluctuating sub-screens, the system employs a predictive compensation mechanism. It sends frame data in advance and monitors the differences between the master and slave screens in real time, dynamically adjusting the predicted latency value to ensure that the screen synchronization error remains within a threshold range. This entire process forms a closed-loop control, guaranteeing clock synchronization accuracy while effectively addressing latency issues caused by network fluctuations, thus achieving precise synchronized display of multiple screens. Attached Figure Description

[0029] The invention will now be further described with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of the structure of the distributed LED screen collaborative control system based on the wireless synchronization protocol of the present invention. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1 As shown, the present invention is a distributed LED screen collaborative control system based on a wireless synchronization protocol, comprising:

[0033] Module division: Obtain the transmission bandwidth K of each LED display screen and the corresponding average transmission bandwidth K. ave , the mean K ave The largest LED display screen is designated as the main screen, and the remaining LED display screens are designated as sub-screens. The transmission bandwidth K represents the bandwidth used for video transmission.

[0034] Detection module: The main screen sends a synchronization signal to the sub-screen, and the sub-screen records the time t2 when it receives the synchronization signal. After a preset time, the main screen sends a timestamp t1 to the sub-screen. The timestamp refers to the time when the synchronization signal is sent.

[0035] When the sub-screen receives the timestamp, it sends a synchronization signal to the main screen. The main screen records the time t4 when it receives the synchronization signal, and after a preset time, it instructs the sub-screen to send the timestamp t3 to the main screen.

[0036] Adjustment module: Generate limit conditions The network latency D and clock skew F are calculated, and the clock of the sub-screen is adjusted based on the clock skew F.

[0037] Subscreens with network latency D > μ are marked. When the same subscreen is marked N ≥ 5 times, it is called a fluctuating subscreen. Here, μ represents the preset network latency threshold. The latency prediction value Y is calculated based on the network latency D.

[0038] Send frame data to the undulating sub-screen in advance (Y), and obtain the frame difference C between the main screen and the undulating sub-screen at this time. If the frame difference C > C max Increase the delayed prediction value Y by y until the image difference C ≤ C max Wherein, the corresponding frame difference C represents the interval between the playback time of the same frame on the main screen and the fluctuating sub-screen, C max y represents the preset image difference threshold, and y represents the preset unit time.

[0039] It should be noted that this LED display synchronous control system adopts a modular design, constructing three major modules: dynamic partitioning of master and slave screens, bidirectional time synchronization detection, and intelligent delay compensation. At the system architecture level, the main control unit of the master screen dynamically partitions the display cluster using an adaptive algorithm, automatically allocating master and slave nodes based on screen resolution, transmission distance, and signal attenuation characteristics to achieve seamless multi-screen splicing. The synchronization detection module innovatively employs a bidirectional timestamp calibration mechanism, monitoring and correcting clock drift in real time through bidirectional heartbeat packet interaction between master and slave devices. Simultaneously, the intelligent delay compensation module uses a dynamic prediction algorithm to pre-correct variables such as cable attenuation and processing delay during video signal transmission, adjusting the pixel-level timing of each frame through a pre-correction strategy. With these three modules working collaboratively, it is suitable for applications with stringent requirements for spatiotemporal consistency, such as large performance venues and dispatch command centers, effectively solving the problems of accumulated delay and screen tearing inherent in traditional synchronous systems.

[0040] The system first dynamically detects the real-time video transmission bandwidth of each display screen within the cluster using an adaptive bandwidth detection protocol. It then calculates the average throughput over a past period using a sliding window algorithm, automatically selecting the device with the strongest bandwidth capacity as the main screen, while the remaining terminals are designated as sub-screens. This intelligent main screen election mechanism based on network performance provides a reliable benchmark for subsequent synchronization parameter optimization, effectively avoiding subjective biases that may arise from traditional manual configuration. During the bidirectional time synchronization phase, the main screen periodically broadcasts a synchronization pulse signal containing a clock stamp. Upon receiving this signal, the sub-screens immediately generate a response frame with a local time stamp, constructing a round-trip delay matrix through bidirectional timestamp comparison. The system jointly estimates network path latency and device clock offset. When a sub-screen clock offset exceeds a preset threshold, a dynamic clock calibration procedure is automatically triggered, fine-tuning the crystal oscillator frequency via a regulator. For sub-screens exhibiting network latency exceeding the limit five consecutive times, the system not only marks them as abnormal and triggers a red alarm but also initiates an adaptive resolution reduction strategy, lowering the output frame rate of the sub-screen to ensure the spatiotemporal consistency of the overall image. This layered processing mechanism not only ensures the core guiding role of the main screen, but also achieves accurate location and dynamic compensation of sub-screen problems through intelligent diagnosis, enabling the system to maintain sub-millisecond synchronization accuracy even in complex network environments.

[0041] To address the synchronization stability issue of fluctuating sub-screens, the system innovatively introduces a composite control mechanism combining predictive compensation and closed-loop feedback. In the predictive compensation phase, the system models the dynamic characteristics of network latency based on the Kalman filter algorithm, establishes a predictive model by analyzing historical latency data, and anticipates and compensates for transmission delays within future time windows, pre-injecting key frame data into the transmission buffer. Simultaneously, differential pulse code modulation (DCM) technology is used to perform real-time pixel-level comparison of the master and slave screen images. The structural similarity index is calculated to quantify image differences, and when the synchronization error approaches a preset threshold, dynamic adjustment of the predicted latency value is immediately triggered.

[0042] The closed-loop control system constructs a complete link of detection, execution, and feedback. It collects display clock status and network quality parameters through intelligent agent modules deployed on sub-screens, and calculates clock deviation values ​​in real time through edge computing nodes to predict network latency trends. The decision module generates optimal compensation strategies based on the prediction results, including selective frame retransmission, dynamic frame rate adjustment, and adaptive bitrate adjustment. The execution phase issues control commands through time-triggered middleware, while FPGA hardware acceleration modules ensure the real-time performance of compensation operations. Finally, the feedback loop records all synchronization parameter adjustments through a blockchain-style data storage mechanism, forming a traceable synchronization log. This provides a basis for subsequent fault diagnosis and continuously optimizes the prediction model parameters through machine learning algorithms.

[0043] This dual-layer control architecture suppresses synchronization errors at their inception through a predictive compensation mechanism, and combines this with a closed-loop feedback system to achieve precise error correction. Even when faced with sudden network jitter, the system can still dynamically adjust the prediction step size and compensation intensity to strictly control the image synchronization error within an acceptable range. Especially in highly dynamic scenarios such as live sports broadcasts, the system can automatically optimize the compensation area based on motion vector analysis, prioritizing the synchronization quality of core image areas, thus achieving a balance between synchronization accuracy and resource utilization.

[0044] In another preferred embodiment of the present invention, the playback progress of the sub-screen is prohibited from exceeding that of the main screen.

[0045] It's worth noting that the playback progress of the sub-screen is strictly limited under system control to ensure it doesn't exceed that of the main screen. First, at the data transmission level, the system employs timestamp technology, assigning an immutable timestamp to each frame output by the main screen. The sub-screen decoder forcibly verifies frame timestamps, automatically discarding any frame data later than the current time anchor point of the main screen. Second, in the buffer management stage, an intelligent cache locking algorithm is deployed to dynamically calculate the real-time latency difference between the main and sub-screens. When a tendency for the sub-screen to render ahead is detected, a buffer freezing mechanism is immediately activated, achieving physical-level progress constraints by pausing the decoding thread and suppressing display refresh operations. Finally, at the anomaly handling level, to address the possibility of momentary data advancement due to network jitter, the system sets up a dual-redundancy verification mechanism: the first layer quickly identifies out-of-order frames using CRC checksums, and the second layer uses a deep learning model to perform semantic-level comparison of the screen content. Once an abnormal scenario is detected where the sub-screen's playback exceeds the narrative progress of the main screen, an emergency rollback operation is immediately triggered, forcing the sub-screen to jump to the corresponding time anchor point of the main screen, while simultaneously generating a system-level alarm event. A comprehensive progress constraint barrier has been built from the data source and processing to the content understanding dimension, which can ensure that the sub-screen is always within the time frame of the main screen even under extreme network conditions, and eliminate the synchronization problem caused by the screen being ahead.

[0046] In another preferred embodiment of the present invention, it includes:

[0047] Calculate the total bandwidth K used for video transmission. When the total bandwidth K is greater than the maximum bandwidth of the channel, notify the staff that there is a video delay.

[0048] Understandably, the system continuously monitors the total bandwidth used by each display screen when transmitting video. When this total bandwidth approaches or exceeds the maximum bandwidth the network channel can handle, an automatic warning mechanism is triggered. First, the monitoring interface alerts staff that "current bandwidth is full." If not addressed promptly, the system automatically reduces the image quality parameters of non-core screens, lowering the resolution or reducing keyframe frequency to prioritize the smoothness of the main screen. If the overload continues to worsen, a detailed optimization suggestion report is generated, providing specific solutions such as adjusting encoding formats and compressing image complexity, and is simultaneously pushed to the maintenance personnel's work terminals. This design not only issues timely warnings when bandwidth is strained but also intelligently adjusts settings to avoid screen stuttering or delays caused by network congestion, ensuring the multi-screen system always maintains a synchronized and stable display.

[0049] In another preferred embodiment of the present invention, it includes:

[0050] A pre-set detection period T is used, and the network latency and clock skew F are recalculated every detection period T.

[0051] It's important to note that the system has a preset intelligent detection cycle, which dynamically adjusts based on network stability. During each detection cycle, the system automatically activates a two-way time synchronization detection mechanism: the main screen sends a synchronization pulse signal carrying a precise timestamp to each sub-screen, and the sub-screens immediately send back a response frame marked with their local clock. By comparing the time difference between the round-trip signals, the system calculates network transmission latency and device clock deviation in real time. When network volatility exceeds a preset value, the detection cycle adaptively shortens to increase monitoring frequency; conversely, in a stable state, the detection cycle can be extended to reduce system load. Each detection data point is incorporated into a machine learning model for trend analysis. If abnormal parameters appear in consecutive detection cycles, the system will trigger a predictive compensation mechanism in advance. This dynamically adjusted detection strategy ensures the real-time accuracy of synchronization parameters while avoiding the resource waste that might result from fixed-cycle detection, making it particularly suitable for complex application scenarios requiring a balance between accuracy and efficiency, such as concert venues and traffic control centers.

[0052] In another preferred embodiment of the present invention, if the sub-screen still does not receive a synchronization signal after a preset judgment time, a prompt message is sent to indicate a transmission line failure.

[0053] It should be noted that when a sub-screen fails to receive a synchronization signal from the main screen for two consecutive detection cycles, the system immediately triggers a multi-level fault alarm mechanism. First, a flashing red warning box pops up on the sub-screen's local display, indicating a lost synchronization signal and a line fault. Simultaneously, an alarm data packet containing the device ID, timestamp, and fault code is sent to the main control system via an encrypted channel. Upon receiving the alarm, the main control center of the main screen highlights the location of the faulty sub-screen in the 3D topology monitoring interface and automatically retrieves and analyzes the latency fluctuation curve of that screen for the most recent period. If the fault persists for a certain period, the system will initiate a backup communication link test program to attempt to rebuild the connection through redundant network interfaces and generate a diagnostic report on the console containing parameters such as fiber loss value and signal-to-noise ratio. This layered alarm design allows on-site maintenance personnel to detect transmission anomalies immediately and provides accurate fault location data for remote technical support, effectively preventing the paralysis of the entire synchronization system due to a single point of failure.

[0054] In another preferred embodiment of the present invention, the unit time y < C max .

[0055] Understandably, when addressing screen latency issues, the system employs a gradual fine-tuning mechanism to ensure the adjustment range remains controllable. When latency is detected in a sub-screen, the compensation module gradually increases the number of preloaded frames in preset time increments. After each adjustment, the master-slave screen comparison module monitors the screen synchronization status in real time. If the compensation increment causes the sub-screen's playback progress to exceed that of the master screen, the system immediately rolls back the adjustment and reduces subsequent increments, while triggering a secondary environmental assessment—recalculating three core parameters: network jitter, clock drift rate, and buffer occupancy. This trial-and-error closed-loop control strategy avoids the risk of exceeding progress limits that may occur with traditional adjustment methods, and accurately matches the optimal compensation value under different network environments. Especially in complex electromagnetic interference scenarios, the system also activates an anti-interference coding mode, reducing the priority of the compensation frequency to prevent erroneous adjustments, ensuring that while eliminating latency, the critical constraint that the sub-screen's progress always lags behind or equals that of the master screen is strictly maintained.

[0056] In another preferred embodiment of the present invention, the method for calculating the delay prediction value Y based on the network delay D includes:

[0057] Calculate the predicted delay value , where D n This represents the network latency when the subscreen is marked for the nth time.

[0058] It's worth noting that the system continuously records the actual latency data each time a sub-screen is marked as abnormal, forming a historical sample set. When a sub-screen is marked with latency for the nth time, the latency values ​​of the five most recent consecutive abnormal events are selected as the basis for analysis. An averaging algorithm is used for preprocessing to generate a latency prediction value. The final prediction value is determined by combining the network latency with the latency prediction value, reflecting both latency trends and responding to sudden network fluctuations. This prediction mechanism pays particular attention to periodic latency characteristics. By analyzing recurring fluctuation patterns in historical data, it anticipates latency peaks, providing a proactive adjustment basis for the compensation module and effectively avoiding synchronization misalignment caused by response lag.

[0059] In another preferred embodiment of the present invention, the method for adjusting the clock of the sub-screen based on the clock deviation F includes:

[0060] When F=0, stop adjusting the clock of the sub-screen;

[0061] When F > 0, slow down the clock of the sub-screen by F time units;

[0062] When F < 0, advance the clock of the sub-screen by F time units.

[0063] It is worth noting that the system obtains the real-time clock deviation F between the main screen and the sub-screen through bidirectional time synchronization detection. When F equals 0, it indicates that the two clocks are perfectly synchronized, and any adjustment operation is immediately stopped to avoid overcorrection. When F is greater than 0, it means that the sub-screen clock is faster than the main screen. The system will gradually slow down the sub-screen crystal oscillator frequency through pulse width modulation technology and adopt a segmented compensation strategy to break down the total adjustment amount F into multiple fine-tuning steps. When F is less than 0, it means that the sub-screen clock is lagging behind the main screen. At this time, the sub-screen clock is gradually accelerated by injecting precision clock pulses, and a temperature compensation mechanism is activated to dynamically adjust the adjustment coefficient according to the real-time operating temperature of the device. The entire adjustment process is coordinated with a closed-loop feedback system. After each adjustment is completed, a second deviation detection is performed immediately to ensure that the adjustment accuracy is always controlled within an appropriate range, effectively preventing clock misalignment caused by adjustment overshoot.

[0064] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A distributed LED screen collaborative control system based on a wireless synchronization protocol, characterized in that, include: Module division: Obtain the transmission bandwidth K of each LED display screen and the corresponding average transmission bandwidth K. ave , the mean K ave The largest LED display screen is designated as the main screen, and the remaining LED display screens are designated as sub-screens. The transmission bandwidth K represents the bandwidth used for video transmission. Detection module: The main screen sends a synchronization signal to the sub-screen, and the sub-screen records the time t2 when it receives the synchronization signal. After a preset time, the main screen sends a timestamp t1 to the sub-screen. The timestamp refers to the time when the synchronization signal is sent. When the sub-screen receives the timestamp, it sends a synchronization signal to the main screen. The main screen records the time t4 when it receives the synchronization signal, and after a preset time, it instructs the sub-screen to send the timestamp t3 to the main screen. Adjustment module: Generate limit conditions The method for adjusting the clock of the sub-screen based on the network latency D and clock skew F includes: When F=0, stop adjusting the clock of the sub-screen; When F > 0, slow down the clock of the sub-screen by F time units; When F < 0, advance the clock of the sub-screen by F time units; Subscreens with network latency D > μ are marked. When the same subscreen is marked N ≥ 5 times, it is called a fluctuating subscreen. Here, μ represents a preset network latency threshold. The method for calculating the latency prediction value Y based on network latency D includes: Calculate the predicted delay value , where D n This represents the network latency when the subscreen is marked for the nth time; Send frame data to the undulating sub-screen in advance (Y), and obtain the frame difference C between the main screen and the undulating sub-screen at this time. If the frame difference C > C max Increase the delayed prediction value Y by y until the image difference C ≤ C max Wherein, the corresponding frame difference C represents the interval between the playback time of the same frame on the main screen and the fluctuating sub-screen, C max y represents the preset image difference threshold, and y represents the preset unit time.

2. The distributed LED screen collaborative control system based on a wireless synchronization protocol according to claim 1, characterized in that, In the aforementioned partitioning module, the playback progress of the sub-screen is prohibited from exceeding that of the main screen.

3. The distributed LED screen collaborative control system based on wireless synchronization protocol according to claim 1, characterized in that, include: Calculate the total bandwidth K used for video transmission. When the total bandwidth K is greater than the maximum bandwidth of the channel, notify the staff that there is a video delay.

4. The distributed LED screen collaborative control system based on wireless synchronization protocol according to claim 1, characterized in that, The adjustment module includes: A pre-set detection period T is used, and the network latency and clock skew F are recalculated every detection period T.

5. The distributed LED screen collaborative control system based on a wireless synchronization protocol according to claim 1, characterized in that, In the detection module, if the sub-screen does not receive a synchronization signal after a preset judgment time, a prompt message is sent indicating a transmission line fault.

6. The distributed LED screen collaborative control system based on a wireless synchronization protocol according to claim 1, characterized in that, In the aforementioned adjustment module, the unit time y < C max .

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