Distributed LED screen cooperative control system based on wireless synchronization protocol

Abstract

The invention relates to the technical field of distributed control, and particularly discloses a distributed LED screen cooperative control system based on a wireless synchronization protocol, and the system comprises a division module which obtains the transmission bandwidth and the mean value of each LED display screen, records the LED display screen with the maximum mean value as a main screen, and records the rest as sub-screens; the detection module is used for sending a synchronizing signal, recording the moment when the synchronizing signal is received, sending a timestamp to the sub-screen, converting the direction and resending; and the adjusting module is used for generating limit value conditions, calculating network delay and clock skew, adjusting clocks of the sub-screens based on the clock skew, screening out fluctuating sub-screens, calculating a delay predicted value based on the network delay, sending frame data in advance, obtaining a picture difference between the main screen and the fluctuating sub-screens, and adjusting the delay predicted value. Through the clock signal synchronization and advanced transmission method, the problem of high delay in high-dynamic display content is solved, and the delay is reduced.

Description

Technical Field

[0001] The present invention relates to the field of distributed control technology, and in particular to a distributed LED screen collaborative control system based on a wireless synchronization protocol. Background Art

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

[0003] Current LED display management systems generally utilize the TCP / IP protocol suite to implement a hybrid networking architecture combining wired Ethernet and wireless Wi-Fi when building control networks, and enhance reliability through network redundancy and failover mechanisms. However, existing systems still suffer from significant deficiencies in data transmission and content updates. Traditional centralized control-based display content update and fault monitoring mechanisms struggle to adapt to the heterogeneous protocols of multi-brand devices in distributed environments, hindering inter-device collaboration. Furthermore, resource scheduling strategies often employ static rules, lacking the ability to respond to real-time load fluctuations and dynamic priority adjustments, resulting in persistently high latency. Particularly problematic is the high latency inherent in the compression and transmission stages of existing video processing pipelines, making it difficult to achieve efficient video stream compression and ensure high-quality display output, particularly for highly dynamic display content. These systemic deficiencies severely hinder efficient multi-device collaboration, dynamic resource optimization, and real-time fault detection in LED display management. Summary of the Invention

[0004] The purpose of the present invention is to provide a distributed LED screen collaborative control system based on a wireless synchronization protocol to solve the above technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] Distributed LED screen collaborative control system based on wireless synchronization protocol, including:

[0007] Division module: Get the transmission bandwidth K of each LED display and the average value K of the corresponding transmission bandwidth ave , the mean K ave The largest LED display screen is recorded as the main screen, and the remaining LED displays are recorded as sub-screens. The transmission bandwidth K represents the bandwidth used for video transmission;

[0008] Detection module: instructs the main screen to send a synchronization signal to the sub-screen, and the sub-screen records the time t2 when the synchronization signal is received. 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 the synchronization signal is received. After a preset time, the sub-screen sends a timestamp t3 to the main screen.

[0010] Adjustment module: Generate limit conditions , and calculate the network delay D and clock deviation F, and adjust the clock of the sub-screen based on the clock deviation F;

[0011] Mark the sub-screens with network delay D>μ. When the same sub-screen is marked N≥5 times, it is recorded as a fluctuating sub-screen, where μ represents the preset network delay threshold. The delay prediction value Y is calculated based on the network delay D.

[0012] Send frame data to the wave sub-screen in advance Y, and obtain the image difference C between the main screen and the wave sub-screen at this time. If the image difference C>C max , increase the delay prediction value Y by y until the picture difference C≤C max , where the picture difference C represents the interval between the playback time of the same frame in the main screen and the wave sub-screen, C max represents the preset picture difference threshold, and y represents the preset unit time.

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

[0014] As a further solution of the present invention: comprising:

[0015] Calculate the total bandwidth K used for video transmission. When the total bandwidth K is greater than the maximum channel bandwidth, the staff will be notified that image delay occurs.

[0016] As a further solution of the present invention: in the adjustment module, it includes:

[0017] A detection period T is preset, and the network delay and clock deviation F are recalculated every detection period T.

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

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

[0020] As a further solution 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] Calculating delay predictions , where D nIndicates the network delay when the sub-screen is marked for the nth time.

[0022] As a further solution 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 sub-screen clock;

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

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

[0026] Beneficial effects of the present invention: The LED display screen synchronization control system adopts a modular design and realizes precise synchronization through three core modules: dynamic division of master and slave screens, two-way time synchronization detection and intelligent delay compensation.

[0027] First, the system automatically detects the real-time video transmission bandwidth of each display. The display with the highest average bandwidth is designated as the primary display, and the remaining displays are designated as secondary displays. Identifying the primary display here serves to establish a target for subsequent adjustments and avoid blind adjustments. Subsequently, through bidirectional signal exchange between the primary and secondary displays, the primary displays transmit synchronization signals and return timestamps. The secondary displays respond with synchronization signals and corresponding timestamps, allowing for precise measurement of network latency and clock deviation. The system automatically calibrates the secondary display clocks based on the measurement results and flags any display with excessive network latency. A display with five consecutive delays is considered a fluctuating display.

[0028] To address these fluctuating sub-screens, the system employs a predictive compensation mechanism. This mechanism sends frame data in advance and monitors the image differences between the master and slave screens in real time. Dynamically adjusting the predicted delay ensures that the image synchronization error remains within the threshold. This entire process forms a closed-loop control mechanism, ensuring clock synchronization accuracy while effectively addressing latency issues caused by network fluctuations, achieving precise, synchronized display across multiple screens. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0030] Figure 1 It is a structural diagram of the distributed LED screen collaborative control system based on the wireless synchronization protocol of the present invention. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

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

[0033] Division module: Get the transmission bandwidth K of each LED display and the average value K of the corresponding transmission bandwidth ave , the mean K ave The largest LED display screen is recorded as the main screen, and the remaining LED displays are recorded as sub-screens. The transmission bandwidth K represents the bandwidth used for video transmission;

[0034] Detection module: instructs the main screen to send a synchronization signal to the sub-screen, and the sub-screen records the time t2 when the synchronization signal is received. 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 the synchronization signal is received. After a preset time, the sub-screen sends a timestamp t3 to the main screen.

[0036] Adjustment module: Generate limit conditions , and calculate the network delay D and clock deviation F, and adjust the sub-screen clock based on the clock deviation F;

[0037] Mark the sub-screens with network delay D>μ. When the same sub-screen is marked N≥5 times, it is recorded as a fluctuating sub-screen, where μ represents the preset network delay threshold. The delay prediction value Y is calculated based on the network delay D.

[0038] Send frame data to the wave sub-screen in advance Y, and obtain the image difference C between the main screen and the wave sub-screen at this time. If the image difference C>C max , increase the delay prediction value Y by y until the picture difference C≤C max , where the picture difference C represents the interval between the playback time of the same frame in the main screen and the wave sub-screen, C max represents the preset picture difference threshold, and y represents the preset unit time.

[0039] It should be noted that the LED display screen synchronization control system adopts a modular design and constructs three major modules: dynamic division of master and slave screens, two-way time synchronization detection, and intelligent delay compensation. At the system architecture level, the main control unit of the master screen uses an adaptive algorithm to dynamically divide the topology of the display cluster, automatically assigning master and slave nodes according to screen resolution, transmission distance, and signal attenuation characteristics, to achieve seamless connection of multi-screen splicing; the synchronization detection module innovatively adopts a two-way timestamp calibration mechanism, through the two-way heartbeat packet interaction between the master and slave devices, to monitor and correct clock drift in real time; at the same time, the intelligent delay compensation module uses a dynamic prediction algorithm to adjust the pixel-level timing of each frame through pre-correction strategies for variables such as cable attenuation and processing delay during video signal transmission. With the three modules working together, it is suitable for application scenarios with strict requirements for temporal and spatial consistency, such as large-scale performance venues and dispatching command centers, and effectively solves the problems of accumulated delay and screen tearing in traditional synchronization systems.

[0040] The system first dynamically detects the real-time video transmission bandwidth of each display in the cluster using an adaptive bandwidth detection protocol. Using a sliding window algorithm to calculate the average throughput over the past period, the device with the strongest bandwidth carrying capacity is automatically selected as the master display, while the remaining terminals are divided into slave displays. This intelligent master display election mechanism, based on network performance, provides a reliable benchmark for subsequent synchronization parameter optimization, effectively avoiding the subjective bias that can arise from traditional manual configuration. During the two-way time synchronization phase, the master display periodically broadcasts synchronization pulse signals containing clock stamps. Upon receiving these signals, the slave displays immediately generate response frames with local time stamps. A round-trip delay matrix is ​​constructed through two-way timestamp comparisons. The system jointly estimates network path delay and device clock offset. If a slave display's clock offset exceeds a preset threshold, a dynamic clock calibration process is automatically triggered, fine-tuning the crystal oscillator frequency via a regulator. For any slave display that experiences five consecutive instances of fluctuating network latency, the system not only flags it as abnormal and triggers a red alarm, but also initiates an adaptive resolution reduction strategy, reducing the slave display's output frame rate to ensure temporal and spatial consistency of the overall image. This layered processing mechanism not only ensures the core leading role of the main screen, but also realizes the precise positioning and dynamic compensation of sub-screen problems through intelligent diagnosis, so that the system can still maintain sub-millisecond synchronization accuracy in complex network environments.

[0041] To address the synchronization stability issues of fluctuating sub-screens, the system innovatively introduces a composite control mechanism that combines predictive compensation with closed-loop feedback. During the predictive compensation phase, the system models the dynamic characteristics of network delays based on the Kalman filter algorithm. By analyzing historical delay data, it establishes a predictive model, pre-judges and compensates for transmission delays within future time windows, and pre-injects key frame data into the transmission buffer. At the same time, differential pulse code modulation technology is used to perform real-time pixel-level comparisons of the master and slave screens. The differences in the images are quantified by calculating the structural similarity index. When the synchronization error is detected to be close to the preset threshold, the system immediately triggers dynamic adjustment of the delay prediction value.

[0042] The closed-loop control system establishes a complete chain of detection, execution, and feedback. An intelligent agent module deployed on the sub-screen collects and displays clock status and network quality parameters. Edge computing nodes calculate clock deviation in real time to predict network latency trends. Based on the prediction results, the decision module generates the optimal compensation strategy, including selective frame retransmission, dynamic frame rate adjustment, and adaptive bitrate adjustment. The execution phase triggers the issuance of middleware control instructions through time, while utilizing an FPGA hardware acceleration module to ensure real-time compensation operations. Finally, the feedback loop records all synchronization parameter adjustment processes through a blockchain-based data storage mechanism, creating a traceable synchronization log. This not only provides a basis for subsequent fault diagnosis but also continuously optimizes the prediction model parameters through machine learning algorithms.

[0043] This two-tiered control architecture uses a predictive compensation mechanism to nip synchronization errors in the bud. Combined with a closed-loop feedback system, it enables precise error correction. This allows the system to maintain acceptable frame synchronization errors even in the face of sudden network jitter by dynamically adjusting the prediction step size and compensation strength. Especially in highly dynamic scenes, such as live sports events, the system automatically optimizes the compensation area based on motion vector analysis, prioritizing synchronization quality in core image areas, achieving a balanced optimization of 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 secondary screen is strictly limited under system control to never exceed that of the primary screen. First, at the data transmission level, the system employs timestamp technology to assign an unalterable time stamp to each frame output by the primary screen. The secondary screen decoder enforces frame timestamp verification and automatically discards any frames later than the primary screen's current time anchor point. Second, in buffer management, an intelligent cache locking algorithm dynamically calculates the real-time latency difference between the primary and secondary screens. If the secondary screen detects a tendency to render ahead of schedule, a buffer freeze mechanism is immediately activated, pausing the decoding thread and suppressing display refresh operations to achieve physical progress constraints. Finally, at the exception handling level, the system implements a dual redundancy check mechanism to address transient data advances caused by network jitter. The first layer uses CRC checksums to quickly identify out-of-sequence frames, while the second layer utilizes a deep learning model to perform semantic-level comparison of image content. If a sub-screen detects an unusual scenario where it overtakes the primary screen's narrative progress, an emergency rollback is triggered, forcing the secondary screen to jump to the corresponding time anchor point on the primary screen and simultaneously generating a system-level alarm. A comprehensive progress constraint barrier has been built from the data source, processing process to 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, eliminating synchronization problems caused by advanced pictures.

[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 channel bandwidth, the staff will be notified that image delay occurs.

[0048] It is understandable that the system will continuously monitor the total bandwidth occupied by each display screen when transmitting video. When this total bandwidth approaches or exceeds the maximum bandwidth that the network channel can bear, the early warning mechanism will be automatically triggered. First, the staff will be reminded on the monitoring interface that "the current bandwidth is fully loaded"; if it is not handled in time, the system will automatically reduce the image quality parameters of non-core screens, lower the resolution or reduce the key frame frequency, giving priority to ensuring the smoothness of the main screen; when the overload situation continues to worsen, a detailed optimization suggestion report will be generated, providing specific solutions including adjusting the encoding format and compressing the image complexity, and will be pushed to the work terminal of the operation and maintenance personnel at the same time. This design can not only issue timely warnings when the bandwidth is tight, but also avoid image freezes or delays caused by network congestion through intelligent adjustment, ensuring that the multi-screen system always maintains a synchronized and stable display state.

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

[0050] A detection period T is preset, and the network delay and clock deviation 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 initiates a two-way time synchronization mechanism: the main screen sends a synchronization pulse signal with a precise timestamp to each slave screen. Upon receiving the pulse, the slave screen immediately returns a response frame marked with its local clock. By comparing the time difference between the round-trip signals, the system calculates network transmission delay and device clock offset in real time. When network fluctuations exceed a preset threshold, the detection cycle is adaptively shortened to increase monitoring frequency. Conversely, under stable conditions, the detection cycle can be extended to reduce system load. Data from each detection cycle is incorporated into a machine learning model for trend analysis. If abnormal parameters occur over consecutive detection cycles, the system triggers a predictive compensation mechanism in advance. This dynamically adjusted detection strategy ensures the real-time accuracy of synchronization parameters while avoiding the resource waste associated with fixed-cycle detection. It is particularly suitable for complex scenarios such as concert venues and traffic dispatch centers, where both accuracy and efficiency are crucial.

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

[0053] It should be noted that if a slave screen fails to receive the 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 slave screen's local display, indicating loss of synchronization signal and line fault. Simultaneously, an alarm 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 slave screen in the 3D topology monitoring interface and automatically retrieves the delay fluctuation curve for that screen over the recent period for analysis. If the fault persists for a certain period, the system initiates a backup communication link test program, attempting to reestablish the connection via redundant network interfaces. A diagnostic report containing parameters such as fiber loss and signal-to-noise ratio is generated on the console. This layered alarm design not only allows on-site operations and maintenance personnel to immediately detect transmission anomalies, but also provides remote technical support with accurate fault location, effectively preventing single-point failures from paralyzing the entire synchronization system.

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

[0055] Understandably, when addressing image latency, the system employs a progressive fine-tuning mechanism to ensure that the adjustment range remains controllable. When a delay is detected on the sub-screen, the compensation module gradually increases the number of preloaded frames in preset increments. After each adjustment, the master-slave comparison module monitors the image synchronization status in real time. If the compensation step causes the sub-screen's playback progress to exceed that of the main screen, the system immediately rolls back the adjustment and reduces the subsequent step size, triggering a secondary environmental assessment—recalculating three core parameters: network jitter, clock drift rate, and buffer occupancy. This tentative closed-loop control strategy avoids the risk of progress exceeding limits associated with traditional adjustment methods while accurately matching the optimal compensation value for different network environments. Especially in complex electromagnetic interference scenarios, the system also activates anti-interference encoding mode, reducing the priority of the compensation frequency to prevent misadjustments. This ensures that while delays are eliminated, the critical constraint of the sub-screen's progress always lags behind or equals that of the main 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] Calculating delay predictions , where D n Indicates the network delay when the sub-screen is marked for the nth time.

[0058] It is worth noting that the system continuously records the actual delay data every time the sub-screen is marked as abnormal, forming a historical sample set. When the delay mark appears on the sub-screen for the nth time, the delay values ​​of the last five consecutive abnormal events are selected as the basis for analysis, and preprocessed through the averaging algorithm to generate a delay prediction value. The final prediction value is determined by the network delay superimposed on the delay prediction value, which can not only reflect the delay change trend, but also respond to sudden network fluctuations. This prediction mechanism pays special attention to the periodic delay characteristics. By analyzing the repetitive fluctuation patterns in historical data, it predicts the arrival of delay peaks in advance, provides a forward-looking adjustment basis for the compensation module, and effectively avoids synchronization problems caused by response lags.

[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 sub-screen clock;

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

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

[0063] It's worth noting that the system uses bidirectional time synchronization to detect the real-time clock deviation F between the main and sub-screens. When F equals 0, the two clocks are completely synchronized, and any adjustments are immediately stopped to avoid overcorrection. When F is greater than 0, the sub-screen clock is faster than the main screen. The system gradually slows down the sub-screen crystal oscillator frequency using pulse-width modulation technology and employs a segmented compensation strategy, splitting the total adjustment F into multiple fine-tuning steps. When F is less than 0, the sub-screen clock lags behind the main screen. Precision clock pulses are injected to gradually accelerate the sub-screen clock, while a temperature compensation mechanism is activated to dynamically adjust the adjustment coefficient based on the device's real-time operating temperature. The entire adjustment process is coordinated with a closed-loop feedback system, with a secondary deviation check performed immediately after each adjustment to ensure that the adjustment accuracy remains within the appropriate range, effectively preventing clock imbalances caused by adjustment overshoot.

[0064] The above is a detailed description of an embodiment of the present invention. However, the content is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements 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 wireless synchronization protocol, characterized in that: include: Division module: Get the transmission bandwidth K of each LED display and the average value K of the corresponding transmission bandwidth ave , the mean K ave The largest LED display screen is recorded as the main screen, and the remaining LED displays are recorded as sub-screens. The transmission bandwidth K represents the bandwidth used for video transmission; Detection module: instructs the main screen to send a synchronization signal to the sub-screen, and the sub-screen records the time t2 when the synchronization signal is received. 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 the synchronization signal is received. After a preset time, the sub-screen sends a timestamp t3 to the main screen. Adjustment module: Generate limit conditions , and calculate the network delay D and clock deviation F, and adjust the sub-screen clock based on the clock deviation F; Mark the sub-screens with network delay D>μ. When the same sub-screen is marked N≥5 times, it is recorded as a fluctuating sub-screen, where μ represents the preset network delay threshold. The delay prediction value Y is calculated based on the network delay D. Send frame data to the wave sub-screen in advance Y, and obtain the image difference C between the main screen and the wave sub-screen at this time. If the image difference C>C max , increase the delay prediction value Y by y until the picture difference C≤C max , where the picture difference C represents the interval between the playback time of the same frame in the main screen and the wave sub-screen, C max represents the preset picture difference threshold, and y represents the preset unit time.

2. The distributed LED screen collaborative control system based on wireless synchronization protocol according to claim 1 is characterized in that: In the division module, the playing 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 is characterized in that: include: Calculate the total bandwidth K used for video transmission. When the total bandwidth K is greater than the maximum channel bandwidth, the staff will be notified that image delay occurs.

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

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

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

7. The distributed LED screen collaborative control system based on wireless synchronization protocol according to claim 1 is characterized in that: In the adjustment module, the method for calculating the delay prediction value Y based on the network delay D includes: Calculating delay predictions , where D n Indicates the network delay when the sub-screen is marked for the nth time.

8. The distributed LED screen collaborative control system based on wireless synchronization protocol according to claim 1 is characterized in that: In the adjustment module, the method for adjusting the clock of the sub-screen based on the clock deviation F includes: When F=0, stop adjusting the sub-screen clock; When F>0, the clock of the sub-screen is slowed down by F time units; When F<0, the clock of the sub-screen is adjusted forward by F time units.

Images