LED display screen

Abstract

The utility model provides a kind of LED display, including receiving card module, adapter plate module, signal equalization circuit, anti broken chain detection circuit, signal bypass circuit and multiple display modules.The system is analyzed video data signal and outputs display control signal by receiving card module, realizes multiple module parallel drive by adapter plate module;Signal equalization circuit carries out amplitude and timing compensation to transmission signal, significantly improves long distance or multistage cascading under the signal attenuation and waveform distortion problem of distortion;Anti broken chain detection circuit real-time monitoring module inter signal state, and when interrupt occurs, trigger signal bypass circuit automatic establishment standby channel, realize the self-healing function of signal link, ensure display continuous stability.The overall scheme of the utility model is significantly superior to prior art in signal reliability, system fault tolerance and display uniformity, especially suitable for high resolution, large area or complex wiring environment under LED display screen system.

Description

Technical Field

[0001] This utility model relates to the field of LED display technology, and in particular to an LED display screen. Background Technology

[0002] Existing LED displays typically consist of a transmitting card, a receiving card, an adapter board, and multiple display modules, cascaded in a daisy-chain configuration. With the continuous improvement of display resolution and refresh rate, the amount of video data increases significantly. In multi-level cascaded transmission, signal attenuation, waveform distortion, and timing drift are prone to occur, leading to flickering, color distortion, or delays in the image. This is especially problematic in long-distance cabling or large-scale splicing scenarios, where signal integrity and synchronization accuracy are difficult to guarantee. Furthermore, when a display module or connecting cable fails, it often causes signal interruption in downstream modules, resulting in the failure of the entire display link. Maintenance and troubleshooting are complex and time-consuming, severely impacting the stability and reliability of the display system.

[0003] On the other hand, traditional display modules generally lack detection and self-recovery mechanisms for signal link status. When a connection is broken, a plug is loose, or the signal attenuates, automatic bypass or fault isolation cannot be achieved, and maintenance personnel must manually disconnect the power to check. In addition, LED modules generate significant heat during long-term operation, and temperature changes affect LED luminous efficiency and current stability, resulting in uneven brightness or color shift. Most existing systems are not designed with temperature compensation or brightness correction functions.

[0004] In summary, the shortcomings of the existing technology urgently need to be addressed. Utility Model Content

[0005] This invention provides an LED display screen to overcome the deficiencies in the prior art, realize the self-healing function of the signal link, and ensure continuous and stable display.

[0006] This utility model provides an LED display screen, including: a receiver card module, an adapter board module, a signal equalization circuit, multiple display modules, an anti-breakdown detection circuit, and a signal bypass circuit; The receiving card module is used to receive video data signals from the transmitting end and convert the video data signals into display control signals and output them to the adapter board module; The adapter board module is electrically connected to the receiver card module and is used to distribute the display control signal to multiple display modules. The signal equalization circuit is electrically connected to the output terminal of the adapter board module and to the input terminals of the multiple display modules. It is used to adjust the amplitude and timing of the transmitted signal to compensate for signal attenuation and waveform distortion caused by multi-stage cascading. Multiple display modules are connected sequentially to the adapter board module in a daisy chain manner. Each display module includes LED beads and a driving circuit, which are used to display images according to the received display control signals. The anti-breakage detection circuit is electrically connected to the adapter board module and the multiple display modules, and is used to detect the signal transmission status between each display module in real time. When a signal interruption or abnormality is detected, an alarm signal is output. A signal bypass circuit, connected to the anti-breakage detection circuit, is used to automatically establish a backup signal path when a signal interruption or abnormality is detected, so that the display control signal can be transmitted to the next-level display module through the backup signal path.

[0007] According to the present invention, an LED display screen is provided, wherein the receiving card module includes a signal input interface, a video decoding unit, a data buffer unit, a timing control unit, and an output interface unit; The signal input interface is used to receive video data signals from the transmitting end, and the video decoding unit is used to parse the video data signals into pixel data streams; The data caching unit is used to buffer and store the pixel data stream; The timing control unit is used to generate display control signals based on the pixel data stream, and send the display control signals to the adapter board module through the output interface unit.

[0008] According to the present invention, an LED display screen is provided, wherein the output interface unit is connected to a 74HC245 signal driver chip, and the 74HC245 chip is used to buffer and drive the display control signal.

[0009] According to the present invention, an LED display screen module includes a signal distribution unit, a power distribution unit, and a power reverse connection protection circuit. The input end of the signal distribution unit is connected to the output end of the receiving card module, and the output end is connected to multiple display modules respectively. It is used to distribute the display control signal output by the receiving card module to multiple display modules to realize parallel driving of multiple modules. The power distribution unit includes an input power port and multiple output power ports. The input power port is connected to the main power supply, and the multiple output power ports supply power to the multiple display modules respectively, so as to provide a stable operating voltage to each display module. The reverse connection protection circuit is located at the input terminal of the power distribution unit and is used to block the current path when the power is reversed.

[0010] According to the present invention, an LED display screen is provided, wherein the signal equalization circuit includes a high-speed differential signal driver chip and an adjustable gain amplifier; The differential signal driver chip is used to perform amplitude recovery on the transmitted LVDS signal; The adjustable gain amplifier is used to adjust the gain according to the number of display modules for signal compensation.

[0011] According to the present invention, an LED display screen is provided, wherein the anti-chain breakage detection circuit includes: multiple detection nodes, a level comparison unit, a logic judgment unit, and a signal feedback unit; The detection node is connected in parallel with the connection point between every two display modules in the daisy chain, and is used to collect the voltage level at that node. The level comparison unit is used to compare the detected level with a preset threshold to determine whether the signal is interrupted; The logic judgment unit is used to generate a bypass control signal based on the comparison result and output the bypass control signal to the signal bypass circuit.

[0012] According to the present invention, an LED display screen is provided, wherein the signal bypass circuit includes a bypass switch unit, a control drive unit, and a redundant channel. The bypass switch unit is located between the input and output terminals of two adjacent display modules in the daisy chain; The control drive unit is connected to the output terminal of the anti-breakage detection circuit, and is used to receive the bypass control signal and drive the bypass switch unit to conduct, so that the signal can continue to be transmitted to the next level display module through the redundant channel.

[0013] According to the LED display screen provided by this utility model, the bypass switch unit in the signal bypass circuit is composed of a bidirectional MOSFET or a solid-state relay. The control drive unit outputs a PWM control signal to control the MOS transistor to turn on or off, thereby switching the signal transmission path.

[0014] According to the present invention, the signal input interface of the receiving card module of the LED display screen is one of HDMI interface, DVI interface or optical fiber communication interface.

[0015] According to the present invention, the LED display module further includes a temperature acquisition unit and a brightness correction unit. The temperature acquisition unit includes a temperature sensor, which is connected to the input terminal of the drive control unit and is used to acquire and display the working temperature inside the module in real time. The brightness correction unit includes a current adjustment circuit, which is connected to the control terminal of the LED driver chip, and is used to adjust the driving current based on the temperature information fed back by the temperature acquisition unit.

[0016] The LED display screen provided by this utility model parses and converts video data signals into display control signals through a receiver card module, and then distributes them to multiple display modules via an adapter board module. This enables synchronous driving and independent signal management of multiple modules, significantly improving the modularity and signal distribution efficiency of the display system. The signal equalization circuit performs amplitude and timing compensation on the LVDS high-speed differential signal during transmission, effectively solving the problems of signal attenuation and waveform distortion in multi-stage daisy-chain structures, thereby ensuring the stability of high refresh rate and high grayscale display.

[0017] Secondly, the anti-breakage detection circuit sets detection points at each module connection node to monitor the signal link status in real time. When an interruption or abnormality is detected, it immediately outputs a bypass control signal to drive the signal bypass circuit to establish a backup channel, so that the signal can continue to be transmitted to the next level module. This achieves self-healing of the breakage and uninterrupted signal display, which greatly improves the reliability and fault tolerance of the system in complex application environments.

[0018] Furthermore, by adding a temperature acquisition unit and a brightness correction unit to the display module, the driving current can be dynamically adjusted according to real-time temperature changes to achieve automatic brightness compensation, ensuring display uniformity and color consistency after long-term operation, and effectively extending the service life of the LED module.

[0019] In summary, this invention optimizes the system at multiple levels, including signal link, power management, and module control. It not only solves the problems of signal attenuation, link failure, and uneven brightness in traditional LED displays, but also has the technical advantages of modularity, intelligence, and self-recovery. It is suitable for various complex application scenarios such as large screens, outdoor advertising screens, and high-end stage displays. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a structural schematic diagram of the LED display screen provided by this utility model. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] To address the problems in existing technologies, this invention proposes an LED display screen to achieve a self-healing function in the signal link, ensuring continuous and stable display. The LED display screen is described below, as follows: Figure 1 As shown, it includes: Receiver card module, adapter board module, signal equalization circuit, multiple display modules, anti-breakdown detection circuit and signal bypass circuit; The receiving card module is used to receive video data signals from the transmitting end and convert the video data signals into display control signals and output them to the adapter board module; The adapter board module is electrically connected to the receiver card module and is used to distribute the display control signal to multiple display modules. The signal equalization circuit is electrically connected to the output terminal of the adapter board module and to the input terminals of the multiple display modules. It is used to adjust the amplitude and timing of the transmitted signal to compensate for signal attenuation and waveform distortion caused by multi-stage cascading. Multiple display modules are connected sequentially to the adapter board module in a daisy chain manner. Each display module includes LED beads and a driving circuit, which are used to display images according to the received display control signals. The anti-breakage detection circuit is electrically connected to the adapter board module and the multiple display modules, and is used to detect the signal transmission status between each display module in real time. When a signal interruption or abnormality is detected, an alarm signal is output. A signal bypass circuit, connected to the anti-breakage detection circuit, is used to automatically establish a backup signal path when a signal interruption or abnormality is detected, so that the display control signal can be transmitted to the next-level display module through the backup signal path.

[0024] In this embodiment, the receiving card module is used to receive video data signals from the transmitting end and to parse and convert the received signals. Specifically, the receiving card module includes a signal input interface, a video decoding unit, a data buffer unit, and a timing control unit. The signal input interface can be in the form of HDMI, DVI, or fiber optic communication interface, etc., for receiving video data signals; the video decoding unit performs protocol parsing and pixel data extraction on the video data signals; the data buffer unit is used to temporarily store pixel data streams to ensure the continuity and stability of subsequent timing output; the timing control unit generates display control signals that meet the driving requirements of the LED display module based on the buffered data, and outputs them to the adapter board module via the output interface unit. Preferably, a 74HC245 signal driver chip is provided in the output interface unit for buffering, amplifying, and controlling the direction of the output signal to ensure signal driving capability and anti-interference performance.

[0025] The adapter board module is electrically connected to the receiver card module and is used to distribute the display control signals output by the receiver card module to multiple display modules. The adapter board module includes a signal distribution unit, a power distribution unit, and a power reverse connection protection circuit. The signal distribution unit realizes parallel data distribution to multiple modules through multiple signal channels; the power distribution unit is used to regulate the input power and output it to multiple display modules respectively; the power reverse connection protection circuit can adopt a diode or MOSFET protection structure to prevent module damage caused by reverse connection of power supply lines.

[0026] The signal equalization circuit is located between the adapter board module and multiple display modules. Its input is connected to the output of the adapter board module, and its output is connected to the input of the multiple display modules. This circuit includes a high-speed differential signal driver chip and an adjustable gain amplifier. The differential signal driver chip is used to restore the amplitude and shape of the LVDS signal, compensating for signal distortion caused by long-distance transmission. The adjustable gain amplifier compensates for the signal amplitude according to the number of modules or the transmission distance, thereby ensuring that the end modules can still receive a stable and complete display signal.

[0027] The multiple display modules are connected sequentially to the adapter board module in a daisy-chain configuration. Each display module includes an LED array, a driving circuit, a temperature acquisition unit, and a brightness correction unit. The driving circuit receives and analyzes display control signals to drive the LEDs to display images. The temperature acquisition unit monitors the internal temperature of the module in real time and feeds the temperature information back to the brightness correction unit. The brightness correction unit dynamically adjusts the driving current according to temperature changes to ensure stable and consistent display brightness.

[0028] The anti-breakage detection circuit is electrically connected to the adapter board module and multiple display modules to detect the continuity of signals between modules in real time. The anti-breakage detection circuit includes multiple detection nodes, a level comparison unit, and a logic judgment unit. The detection nodes are connected in parallel at the connection ports of adjacent modules to detect whether the signal is being transmitted normally. When the level comparison unit detects that any link is broken, the logic judgment unit immediately outputs a bypass control signal.

[0029] The signal bypass circuit is connected to the anti-chain interruption detection circuit and is used to automatically establish a backup signal path when a signal interruption or abnormality is detected. The signal bypass circuit includes a bypass switch unit, a control drive unit, and a redundant channel. The bypass switch unit can be composed of a bidirectional MOSFET or a solid-state relay. After receiving the bypass control signal, the control drive unit drives the bypass switch to conduct, thereby allowing the display control signal to bypass the faulty module and continue to be transmitted to the next-level module, realizing the self-healing and redundancy protection of the signal link.

[0030] Through the above structural design, this embodiment can effectively avoid problems such as signal attenuation, waveform distortion and chain breakage failure in LED display screens during daisy chain transmission, and significantly improve the system's reliability, display consistency and maintenance convenience.

[0031] As a further optional embodiment, the receiver card module includes a signal input interface, a video decoding unit, a data buffer unit, a timing control unit, and an output interface unit; The signal input interface is used to receive video data signals from the transmitting end, and the video decoding unit is used to parse the video data signals into pixel data streams; The data caching unit is used to buffer and store the pixel data stream; The timing control unit is used to generate display control signals based on the pixel data stream, and send the display control signals to the adapter board module through the output interface unit.

[0032] In this embodiment, the receiver card module includes a signal input interface, a video decoding unit, a data buffer unit, a timing control unit, and an output interface unit. The signal input interface can be an HDMI interface, a DVI interface, or a fiber optic communication interface, used to receive video data signals from a host computer or a video transmitter. After processing by the video decoding unit, the input signal is parsed into a pixel data stream, which contains the color and brightness information corresponding to each pixel.

[0033] To avoid transient loss of synchronization or delay caused by high-speed data transmission, the receiver card module is equipped with a data buffer unit, which can adopt DDR memory or FIFO buffer structure for temporary storage of decoded video data. This buffer structure not only ensures the continuity and timing accuracy of data stream transmission between different modules, but also enables synchronous switching of multi-frame data, thereby improving the stability and consistency of the display.

[0034] The timing control unit generates display control signals based on the buffered video data, including row signals, column signals, data clock signals, and synchronization signals. This timing control unit can be implemented internally by an FPGA logic control circuit or a dedicated display control chip, and is used to output control waveforms that meet the driving requirements of the LED display module according to a predetermined refresh rate and scan timing.

[0035] Preferably, the output interface unit is connected to a 74HC245 signal driver chip for buffering and level driving of the display control signals output by the timing control unit. The 74HC245 chip has powerful output driving capabilities, effectively preventing amplitude attenuation or waveform distortion during long-distance transmission. Simultaneously, this chip can achieve a "one-to-one" independent clock distribution mode, meaning that the clock signal for each HUB interface is output from an independent pin of the 74HC245 chip, with complete physical isolation between the signals, avoiding mutual interference caused by parallel loads.

[0036] Through the above structural design, the receiver card module can stably output high-quality display control signals in complex systems with multiple modules driven in parallel, ensuring that the LED display screen still has a clear and flicker-free display effect under high resolution and high refresh rate.

[0037] As a further optional embodiment, the output interface unit is connected to a 74HC245 signal driver chip, which is used to buffer and drive the display control signal.

[0038] In this embodiment, the 74HC245 chip is an eight-channel bidirectional tri-state bus transceiver with direction control and output enable functions. It can perform level conversion, signal isolation, and current amplification on display control signals from the timing control unit. The chip's input is connected to the output of the timing control unit of the receiver card module to receive row, column, data, and clock signals generated by timing logic. Its output is connected to the signal input of the adapter board module to provide amplified and shaped display control signals to multiple display modules.

[0039] Preferably, in this embodiment, to address the requirement for independent transmission of multiple clock signals in an LED display screen, the 74HC245 chip adopts a "one-to-one" clock drive architecture. That is, the clock signal of each HUB interface is driven and output by an independent pin of the 74HC245 chip, achieving physical isolation between the signals and eliminating any parallel sharing relationship. This structure effectively prevents interference to other paths caused by any module malfunction, open circuit, or load change, thereby improving the signal independence and reliability of the entire screen system.

[0040] Furthermore, when the number of signal outputs from the display screen is large, a two-stage driving strategy can be adopted to enhance signal strength. Specifically, the output signal of the first-stage 74HC245 chip serves as the input to multiple second-stage 74HC245 chips, thereby achieving multi-channel hierarchical amplification and driving. This multi-stage buffering method ensures that even when the signal needs to cross multiple modules and connecting lines in large-size LED displays, it still maintains a high-quality signal output with steep waveforms, clear rising edges, and low jitter.

[0041] By employing a hierarchical buffer design using the 74HC245 signal driver chip, this embodiment significantly improves the anti-interference capability and signal consistency of the LED display system, avoiding display abnormalities caused by signal attenuation, line length mismatch, or load imbalance, and ensuring stable, uniform, and excellent display effects for the entire screen.

[0042] As a further optional embodiment, the adapter board module includes a signal distribution unit, a power distribution unit, and a power reverse connection protection circuit; The input end of the signal distribution unit is connected to the output end of the receiving card module, and the output end is connected to multiple display modules respectively. It is used to distribute the display control signal output by the receiving card module to multiple display modules to realize parallel driving of multiple modules. The power distribution unit includes an input power port and multiple output power ports. The input power port is connected to the main power supply, and the multiple output power ports supply power to the multiple display modules respectively, so as to provide a stable operating voltage to each display module. The reverse connection protection circuit is located at the input terminal of the power distribution unit and is used to block the current path when the power is reversed.

[0043] In this embodiment, the adapter board module integrates a signal distribution unit and a power distribution unit, achieving unified management of display control signals and operating power, reducing the number of external connections and simplifying the system wiring structure. Through the inclusion of a reverse connection protection circuit, the current path is promptly cut off when the input power polarity is reversed, preventing damage to the main power supply and display modules due to reverse connection, thus improving system safety and reliability. Furthermore, the parallel output design of the signal distribution unit allows for the simultaneous driving of multiple display modules, enhancing the display's expandability and modular flexibility, facilitating the splicing and maintenance of large-size displays.

[0044] As a further optional embodiment, the signal equalization circuit includes a high-speed differential signal driver chip and an adjustable gain amplifier; The differential signal driver chip is used to perform amplitude recovery on the transmitted LVDS signal; The adjustable gain amplifier is used to adjust the gain according to the number of display modules for signal compensation.

[0045] In this embodiment, the signal equalization circuit uses a high-speed differential signal driver chip to restore the amplitude of the attenuated LVDS signal during long-distance transmission, effectively reducing signal distortion and jitter. Simultaneously, the adjustable gain amplifier dynamically adjusts its output gain according to the number of connected display modules, thereby achieving automatic compensation for signal strength under different load conditions and ensuring consistent control signal amplitude received by each display module. This design enhances the system's signal integrity and anti-interference capabilities, significantly improving display synchronization and stability under parallel multi-module driving.

[0046] As a further optional embodiment, the anti-chain breakage detection circuit includes: multiple detection nodes, a level comparison unit, a logic judgment unit, and a signal feedback unit; The detection node is connected in parallel with the connection point between every two display modules in the daisy chain, and is used to collect the voltage level at that node. The level comparison unit is used to compare the detected level with a preset threshold to determine whether the signal is interrupted; The logic judgment unit is used to generate a bypass control signal based on the comparison result and output the bypass control signal to the signal bypass circuit.

[0047] In this embodiment, the anti-disconnection detection circuit sets detection nodes at each node of the daisy-chain connection structure to achieve real-time monitoring of the signal connectivity status between each display module. When the level of a certain node is lower than a preset threshold, the level comparison unit outputs an abnormal signal, and the logic judgment unit generates a bypass control signal accordingly, driving the signal bypass circuit to automatically switch the path. This ensures that even if a module disconnects or fails, the signal transmission of subsequent modules remains uninterrupted. This design significantly improves the reliability and fault tolerance of the multi-module cascaded system, avoids the problem of entire-screen display interruption due to a single point of failure, and enhances system stability and maintenance convenience.

[0048] As a further optional embodiment, the signal bypass circuit includes a bypass switch unit, a control drive unit, and a redundant channel; The bypass switch unit is located between the input and output terminals of two adjacent display modules in the daisy chain; The control drive unit is connected to the output terminal of the anti-breakage detection circuit, and is used to receive the bypass control signal and drive the bypass switch unit to conduct, so that the signal can continue to be transmitted to the next level display module through the redundant channel.

[0049] In this embodiment, the signal bypass circuit achieves automatic signal switching in the event of a daisy-chain interruption through a bypass switch unit, a control drive unit, and redundant channels. Specifically, when the anti-breakdown detection circuit detects a signal interruption or abnormality in a display module or connection node, the logic judgment unit generates a bypass control signal and transmits it to the control drive unit. The control drive unit then drives the bypass switch unit to conduct, allowing the signal to be transmitted to the next-level display module through the redundant channel, thereby ensuring that the display control signal reaches subsequent modules without interruption. This design can maintain the continuous operation of the entire display system in the event of a single module or link failure, improving the system's reliability and fault tolerance, while simplifying troubleshooting and maintenance operations.

[0050] As a further optional embodiment, the bypass switch unit in the signal bypass circuit is composed of a bidirectional MOSFET or a solid-state relay. The control drive unit outputs a PWM control signal to control the MOS transistor to turn on or off, thereby switching the signal transmission path.

[0051] In this embodiment, the bypass switch unit is composed of a bidirectional MOSFET or a solid-state relay, used for rapidly switching signal transmission paths. When the anti-chain breakage detection circuit detects a signal interruption or abnormality in a display module or connection node in the daisy chain, the control drive unit outputs a PWM control signal to control the MOSFET to turn on or off, thereby automatically guiding the signal to a redundant channel to continue transmission to the next-level display module. This design not only achieves a highly reliable signal bypass function, but also enables precise adjustment of the conduction state through PWM control, improving switching response speed and transmission stability, ensuring that the entire display system can still operate continuously and stably under abnormal conditions.

[0052] As a further optional embodiment, the signal input interface of the receiving card module is one of an HDMI interface, a DVI interface, or an optical fiber communication interface.

[0053] In this embodiment, the receiving card module receives video data signals from the transmitting end via any one of an HDMI interface, a DVI interface, or a fiber optic communication interface. This design enables the LED display screen to be compatible with different types of video signal sources, meeting the needs of various application scenarios, and ensuring high-speed transmission and high-quality resolution of input signals. It provides a stable and reliable signal foundation for subsequent video decoding, data buffering, and display control signal generation, thereby improving the applicability and flexibility of the entire display system.

[0054] As a further optional embodiment, the display module also includes a temperature acquisition unit and a brightness correction unit; The temperature acquisition unit includes a temperature sensor, which is connected to the input terminal of the drive control unit and is used to acquire and display the working temperature inside the module in real time. The brightness correction unit includes a current adjustment circuit, which is connected to the control terminal of the LED driver chip, and is used to adjust the driving current based on the temperature information fed back by the temperature acquisition unit.

[0055] In this embodiment, the display module monitors its internal operating temperature in real time through a temperature acquisition unit. The temperature sensor transmits the collected temperature information to the drive control unit. Based on this temperature information, the current adjustment circuit in the brightness correction unit dynamically adjusts the output current of the LED driver chip, thereby achieving automatic LED brightness correction. This design effectively compensates for brightness drift caused by temperature changes, ensuring brightness uniformity and image quality stability across the entire screen, while extending the lifespan of the LED module and improving the overall reliability and visual effect of the display system.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An LED display screen, characterized in that, include: Receiver card module, adapter board module, signal equalization circuit, multiple display modules, anti-breakdown detection circuit and signal bypass circuit; The receiving card module is used to receive video data signals from the transmitting end and convert the video data signals into display control signals and output them to the adapter board module; The adapter board module is electrically connected to the receiver card module and is used to distribute the display control signal to multiple display modules. The signal equalization circuit is electrically connected to the output terminal of the adapter board module and to the input terminals of the multiple display modules. It is used to adjust the amplitude and timing of the transmitted signal to compensate for signal attenuation and waveform distortion caused by multi-stage cascading. Multiple display modules are connected sequentially to the adapter board module in a daisy chain manner. Each display module includes LED beads and a driving circuit, which are used to display images according to the received display control signals. The anti-breakage detection circuit is electrically connected to the adapter board module and the multiple display modules, and is used to detect the signal transmission status between each display module in real time. When a signal interruption or abnormality is detected, an alarm signal is output. A signal bypass circuit, connected to the anti-breakage detection circuit, is used to automatically establish a backup signal path when a signal interruption or abnormality is detected, so that the display control signal can be transmitted to the next-level display module through the backup signal path.

2. The LED display screen according to claim 1, characterized in that, The receiver card module includes a signal input interface, a video decoding unit, a data buffer unit, a timing control unit, and an output interface unit; The signal input interface is used to receive video data signals from the transmitting end, and the video decoding unit is used to parse the video data signals into pixel data streams; The data caching unit is used to buffer and store the pixel data stream; The timing control unit is used to generate display control signals based on the pixel data stream, and send the display control signals to the adapter board module through the output interface unit.

3. The LED display screen according to claim 2, characterized in that, The output interface unit is connected to the 74HC245 signal driver chip, which is used to buffer and drive the display control signal.

4. The LED display screen according to claim 1, characterized in that, The adapter board module includes a signal distribution unit, a power distribution unit, and a power reverse connection protection circuit. The input end of the signal distribution unit is connected to the output end of the receiving card module, and the output end is connected to multiple display modules respectively. It is used to distribute the display control signal output by the receiving card module to multiple display modules to realize parallel driving of multiple modules. The power distribution unit includes an input power port and multiple output power ports. The input power port is connected to the main power supply, and the multiple output power ports supply power to the multiple display modules respectively, so as to provide a stable operating voltage to each display module. The reverse connection protection circuit is located at the input terminal of the power distribution unit and is used to block the current path when the power is reversed.

5. The LED display screen according to claim 1, characterized in that, The signal equalization circuit includes a high-speed differential signal driver chip and an adjustable gain amplifier; The differential signal driver chip is used to perform amplitude recovery on the transmitted LVDS signal; The adjustable gain amplifier is used to adjust the gain according to the number of display modules for signal compensation.

6. The LED display screen according to claim 1, characterized in that, The anti-chain breakage detection circuit includes: multiple detection nodes, a level comparison unit, a logic judgment unit, and a signal feedback unit; The detection node is connected in parallel with the connection point between every two display modules in the daisy chain, and is used to collect the voltage level at that node. The level comparison unit is used to compare the detected level with a preset threshold to determine whether the signal is interrupted; The logic judgment unit is used to generate a bypass control signal based on the comparison result and output the bypass control signal to the signal bypass circuit.

7. The LED display screen according to claim 6, characterized in that, The signal bypass circuit includes a bypass switch unit, a control drive unit, and redundant channels; The bypass switch unit is located between the input and output terminals of two adjacent display modules in the daisy chain; The control drive unit is connected to the output terminal of the anti-breakage detection circuit, and is used to receive the bypass control signal and drive the bypass switch unit to conduct, so that the signal can continue to be transmitted to the next level display module through the redundant channel.

8. The LED display screen according to claim 7, characterized in that, The bypass switch unit in the signal bypass circuit is composed of a bidirectional MOSFET or a solid-state relay. The control drive unit outputs a PWM control signal to control the MOS transistor to turn on or off, thereby switching the signal transmission path.

9. The LED display screen according to claim 1, characterized in that, The signal input interface of the receiving card module is one of HDMI interface, DVI interface or optical fiber communication interface.

10. The LED display screen according to claim 1, characterized in that, The display module also includes a temperature acquisition unit and a brightness correction unit; The temperature acquisition unit includes a temperature sensor, which is connected to the input terminal of the drive control unit and is used to acquire and display the working temperature inside the module in real time. The brightness correction unit includes a current adjustment circuit, which is connected to the control terminal of the LED driver chip and is used to adjust the driving current based on the temperature information fed back by the temperature acquisition unit.

Images