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CN-122024636-A - Automatic screen connecting system and method for LED display screen

CN122024636ACN 122024636 ACN122024636 ACN 122024636ACN-122024636-A

Abstract

The invention discloses an automatic screen connection system and method of an LED display screen, which relate to the technical field of LEDs and comprise the steps of S1 to S5, wherein S1, equipment access and capability acquisition discover a controller, a transmitting end, a receiving card and a panel unit in a mode of combining management network broadcasting and roll calling, acquire pixel spacing, resolution, a scanning mode, maximum bandwidth, port number, link capability and firmware version, form an equipment list, S2, topology inference and screen connection arrangement infer data trend and panel arrangement according to port adjacent relation and return keep-alive frame time sequence, generate a screen connection layout and port allocation table by combining target picture resolution and refreshing strategies, and execute connectivity check and bandwidth check, S3, time sequence synchronization and grid mapping align input signals based on a reference clock, and determine frame start, line start and subfield time sequence.

Inventors

  • GUO HUI

Assignees

  • 南京昀通光电科技有限公司

Dates

Publication Date
20260512
Application Date
20260403

Claims (8)

  1. 1. The automatic screen connection method for the LED display screen is characterized by comprising the following steps of S1 to S5: s1, device access and capability acquisition discovers a controller, a transmitting end, a receiving card and a panel unit in a mode of combining network broadcasting and roll calling, acquires pixel spacing, resolution, scanning modes, maximum bandwidth, port number, link capability and firmware version, and forms a device list; S2, topology inference and screen connection arrangement infer data trend and panel arrangement according to the port adjacent relation and the returned keep-alive frame time sequence, a screen connection layout and port allocation table is generated by combining target picture resolution and refreshing strategy, and connectivity check and bandwidth check are executed; S3, aligning the input signals based on a reference clock by using time sequence synchronization and grid mapping, determining frame start, line start and subfield time sequences, generating a display grid mapping and panel orientation matrix, and transmitting the display grid mapping and panel orientation matrix to a receiving side; S4, collecting brightness characteristics and chromaticity characteristics at two sides of the seam by seam alignment and brightness and color balance, calculating edge pressing parameters and seam transition weights, and combining a panel reference curve to complete brightness calibration and chromaticity matrix correction; S5, operation monitoring and abnormal recovery are carried out to collect keep-alive frames, temperatures, currents, frame loss, retransmission and time delay indexes, path reconstruction and backup port switching are carried out when a link is disconnected or a unit is offline, and consistency rechecking is carried out and configuration consistency is kept after fault recovery.
  2. 2. The method for automatically connecting LED display screens according to claim 1, wherein S1 comprises S1-1 and S1-2: S1-1, a device access module sends a broadcast frame and a roll call frame according to a discovery period, acquires response time, stability, device fingerprints and capability fields, performs threshold value removing average on the same device in a discovery window to form a stable response set, and a capability acquisition module reads pixel spacing, panel width and height, a scanning mode, a maximum bearing rate, port number, link capability, firmware version and serial number and checks integrity after establishing a safety session; S1-2, after the equipment list is stable, the system sends loop codes with sequence signatures by ports, records the return sequences, arrival time and the positions of missing codes, preliminarily establishes a port adjacency relation, uses related coefficients for adjacency judgment and sets a minimum passing threshold value, carries out secondary detection and slow confirmation on critical value samples, avoids error connection, combines a keep-alive frame arrival sequence, calculates propagation intervals of adjacent ports and marks suspected directions, so as to obtain a port adjacency list, a propagation interval list and a direction mark, provides stable input for topology inference, sets the ports as a recheck state if multi-branch convergence, loops or backflow occurs, requires manual confirmation or field correction lines, avoids the formation of a non-solution path in the subsequent arrangement, and has the formula of r=Σ (ai×bi)/(2) ×bi), and has the parameter interpretation of the similarity of loop sequences, ai is the ith numerical value of the loop codes of the port A, bi is the ith numerical value of the loop codes of the port B, and has the square root of the loop codes of the port B, and has the sum of square root of the square root and has the parameter value of rt.
  3. 3. The method for automatically connecting LED display screens according to claim 2, wherein S2 is specifically: S2-1, the system regards a port adjacency list and a propagation interval list as the edges of the graph, regards equipment ports as nodes of the graph, carries out hierarchical traversal and consistency constraint solving, identifies data starting points, branch points, end points and potential loops, calculates cost for each candidate path and selects a minimum cost scheme to output a physical topological graph for the paths with less hops, and marks the upstream port, the downstream port and the relative positions of each panel; S2-2, according to a target picture resolution and refreshing strategy and a physical topological graph, the system generates a port allocation table and a path loading table, firstly performs bandwidth check on each output link, then performs connectivity and mapping overlapping check, calculates required throughput from a pixel scale, a refreshing rate, a bit depth and a scanning mode, compares the required throughput with port payload capacity, enters a reassignment queue, then automatically spreads panel coordinates on a wall grid by the system, combines orientation information to form a mapping initial draft, and performs consistency check to give correction suggestions to a overlapping area, a cavity area and a cross-port fracture area until all check items pass.
  4. 4. The method for automatically connecting LED display screens according to claim 3, wherein S3 is specifically as follows: S3-1, a clock alignment module locks a unified reference clock, frequency difference and phase difference between input and reference are measured, frequency is made to be close through integral multiple frequency division, then phase is compensated by fine step length, frame start, line start and sub-field time sequences fall into an allowed window, a system continuously monitors jitter and compares the jitter with a threshold value, if the jitter exceeds the threshold value, the system rolls back to the last stable parameter and is aligned again, synchronous stability of a multi-link picture is ensured, an aligned state is written into a monitoring table at any time and used for abnormality diagnosis and switching window calculation, and follow-up joint processing and bright color equalization are ensured to be carried out under the stable time sequence; s3-2, the system issues a positioning test pattern, judges the rotation, turnover and installation orientation of each panel through the edge direction and the adjacent response, maps pixels to local coordinates of the panels according to wall coordinates on the basis, converts the local coordinates into pixel serial numbers and row and column indexes through a receiving card scanning mode to form a mapping matrix and an orientation matrix which can be issued, and when the fact that the orientation is inconsistent with the adjacent direction is detected, the system prompts to reconfirm the installation and provides an automatic correction scheme to avoid large-area staggered arrangement.
  5. 5. The method for automatically connecting LED display screens according to claim 4, wherein S4 is specifically: S4-1, sampling brightness and edge contours at two sides of a seam by using fixed windows, calculating contrast indexes and generating edge pressing coefficients, so as to perform gradual fusion in a transition region, inhibiting ridge lines and black edges, enabling seam processing to only act on adjacent pixels of the seam to avoid integral brightness drift of the whole panel, recording processed edge residual errors and transition widths for rechecking and rollback, automatically increasing the transition widths and pressing intensity when the characteristic mutation of the seam is caused by panel aging or replacement, and returning normal parameters in the next stable period, wherein the formula is contrastSeam = | Lleft-Lright | (Lleft + Lright +epsilon), parameter interpretation is contrastSeam is seam contrast, lleft is a seam left brightness measurement value, lright is a right brightness measurement value, |and epsilon is an absolute value, and epsilon is an extremely small positive number to prevent denominator from being zero; S4-2, the system firstly measures the brightness curve of the panel by reference gray scale, calculates the gain of each panel, enables the gain to output consistent brightness under a unified reference, then carries out linear transformation on three-color channels according to a three-by-three-color matrix, corrects white balance and color cast, gradually approximates target values in a plurality of refreshing periods by adopting limiting steps for brightness gain and matrix elements to avoid flicker, freezes parameters after reaching a consistency threshold value, and outputs panel-level brightness gain, a chromaticity matrix and a reference curve index after balancing is completed, and the panel-level brightness gain, the chromaticity matrix and the reference curve index are stored as versioning parameters so as to facilitate comparison and rollback in the future.
  6. 6. The method for automatically connecting LED display screens according to claim 5, wherein S5 is specifically: S5-1, collecting keep-alive frames, temperatures, currents, frame loss, retransmission, time delay and alignment states in a fixed period to form a time sequence, when the frame loss rate or the retransmission rate exceeds a threshold value or the alignment state is overturned to be unaligned, immediately entering an alarm state by the system and triggering a positioning process, and accurately providing an executable repair action list according to spatial distribution of gaps of the keep-alive frames, port alarm numbers, temperature current linkage overrun and time sequence jitter overrun threshold, and accurate to a specific link section or a specific panel unit; S5-2, when a link or a unit fails irrecoverably, the system searches a backup path on a physical topological graph, the cost function synthesizes hop count, time delay and residual bandwidth penalty, a scheme with the minimum cost is selected to execute switching, a switching window comprises a protection time slot, switching action time and relock time to avoid picture flickering, the system completes dual-path switching and stability checking in the window, loads the last effective configuration after the switching is completed, checks the consistency of the abstract, rolls back to a target version if the consistency is not consistent, and re-checks the frame alignment, the mapping consistency and the brightness parameters to be consistent until all check items pass.
  7. 7. The automatic screen connection system of the LED display screen is characterized by comprising a device screen connection arrangement module, a synchronous calibration module and a guarantee maintenance module, wherein the device screen connection arrangement module is used for collecting capability information of a controller, a transmitting end, a receiving card and a panel unit on a management network and a video link and deducing the trend of data to generate a screen connection scheme, the synchronous calibration module is used for executing clock alignment and frame initiation checking and generating display grid mapping, seam and brightness calibration parameters and issuing, and the guarantee maintenance module is used for executing health monitoring, abnormal positioning, link reconstruction, double-path switching, configuration storage and version rollback.
  8. 8. The automatic screen connection system of the LED display screen of claim 7, wherein the equipment screen connection arrangement module comprises an equipment access module, a capability acquisition module, an adjacency detection module, a topology inference module, a screen connection arrangement module and a consistency check module; The synchronous calibration module comprises a clock alignment module, a frame alignment module, a grid mapping module, a panel orientation identification module, a seam alignment module and a brightness and color equalization module; The safeguard module comprises a health monitoring module, an abnormality positioning module, a link reconstruction module, a dual-path switching module, a configuration storage module and a version rollback module; The system comprises a device access module, a capability acquisition module, an adjacency detection module, a topology inference module, a clock alignment module, a frame alignment module, a grid mapping module, a panel orientation recognition module, a seam alignment module, a bright color equalization module, a health monitoring module, an anomaly positioning module, a link reconstruction module, a dual-path switching module, a configuration storage module, a version rollback module, a configuration tray and rollback module, wherein the device access module is electrically connected with the capability acquisition module and the adjacency detection module through a management network, the acquired device list and adjacency information are electrically connected to the topology inference module, the topology inference module is electrically connected with the screen arrangement module and is read back and checked by the consistency check module, the clock alignment module is electrically connected with the frame alignment module through a video reference signal, the grid mapping module is electrically connected with the panel orientation recognition module to the receiving card, the seam alignment module and the bright color equalization module are electrically connected with the calibration parameters to the receiving card, the health monitoring module acquires the states of the modules and is electrically connected to the anomaly positioning module, the link reconstruction module and the dual-path switching module, and the configuration storage module and the version rollback module are electrically connected to all modules.

Description

Automatic screen connecting system and method for LED display screen Technical Field The invention relates to the technical field of LEDs, in particular to an automatic screen connection system and method for an LED display screen. Background LED display systems are widely used by virtue of their high brightness and the characteristic of being able to be tiled. In the existing network engineering, the controller, the transmitting end, the receiving card and the panel unit are from a plurality of manufacturers, and the pixel spacing, the scanning mode, the panel orientation and the version caliber are obviously different. The construction of the continuous screen depends on manual input of panel specifications, data line trend, interface distribution, synchronization mode and chromaticity calibration parameters, and the topology drawing and grid mapping configuration of the continuous screen are time-consuming and error-prone. The construction site network links are lengthy, the equipment hot plug is frequent, and the traditional scheme needs site engineers to rearrange when the equipment is changed, restarted after power failure and the unit is replaced, so that the requirements of quick assembly and disassembly and high availability cannot be met. Therefore, it is necessary to design an automatic screen connection system and method for an LED display screen with low operation and maintenance risk. Disclosure of Invention The invention aims to provide an automatic screen connecting system and method for an LED display screen, which are used for solving the problems in the background technology. In order to solve the technical problems, the invention provides the following technical scheme that the automatic screen connection method of the LED display screen comprises the following steps of S1 to S5: s1, device access and capability acquisition discovers a controller, a transmitting end, a receiving card and a panel unit in a mode of combining network broadcasting and roll calling, acquires pixel spacing, resolution, scanning modes, maximum bandwidth, port number, link capability and firmware version, and forms a device list; S2, topology inference and screen connection arrangement infer data trend and panel arrangement according to the port adjacent relation and the returned keep-alive frame time sequence, a screen connection layout and port allocation table is generated by combining target picture resolution and refreshing strategy, and connectivity check and bandwidth check are executed; S3, aligning the input signals based on a reference clock by using time sequence synchronization and grid mapping, determining frame start, line start and subfield time sequences, generating a display grid mapping and panel orientation matrix, and transmitting the display grid mapping and panel orientation matrix to a receiving side; S4, collecting brightness characteristics and chromaticity characteristics at two sides of the seam by seam alignment and brightness and color balance, calculating edge pressing parameters and seam transition weights, and combining a panel reference curve to complete brightness calibration and chromaticity matrix correction; S5, operation monitoring and abnormal recovery are carried out to collect keep-alive frames, temperatures, currents, frame loss, retransmission and time delay indexes, path reconstruction and backup port switching are carried out when a link is disconnected or a unit is offline, and consistency rechecking is carried out and configuration consistency is kept after fault recovery. According to the above technical scheme, the S1 comprises S1-1 and S1-2: S1-1, a device access module sends a broadcast frame and a roll call frame according to a discovery period, acquires response time, stability, device fingerprints and capability fields, performs threshold value removing average on the same device in a discovery window to form a stable response set, and a capability acquisition module reads pixel spacing, panel width and height, a scanning mode, a maximum bearing rate, port number, link capability, firmware version and serial number and checks integrity after establishing a safety session; S1-2, after the equipment list is stable, the system sends loop codes with sequence signatures by ports, records the return sequences, arrival time and the positions of missing codes, preliminarily establishes a port adjacency relation, uses related coefficients for adjacency judgment and sets a minimum passing threshold value, carries out secondary detection and slow confirmation on critical value samples, avoids error connection, combines a keep-alive frame arrival sequence, calculates propagation intervals of adjacent ports and marks suspected directions, so as to obtain a port adjacency list, a propagation interval list and a direction mark, provides stable input for topology inference, sets the ports as a recheck state if multi-branch convergence, loops or backflow occurs, requires manu