It has the ability to receive various types of video signals, process and send ultra-high-definition images; it can send the processed video to the LED display screen through the network port and optical fiber port; and it has powerful processing capabilities to effectively improve the load utilization rate, powerful processing capabilities, ultra-stable performance and ultra-high cost performance. Gigabit network port output, supports arbitrary splicing of two up and down, left and right, supports network port loop backup and dual master control backup. When one of the lines fails, the other line will work immediately to ensure the normal operation and display of the display screen. It supports multiple preset resolutions and supports resolution customization function. It supports multiple frame rate inputs such as 30/50/60//120HZ, supports frame reduction, supports host computer software to monitor the operating parameters and status of the sending card, and device brightness adjustment. No computer is required. The screen brightness can be adjusted by one button. It supports Gigabit network bit error rate detection and monitors the data packet loss on the transmission link during communication between receiving cards. It supports point-by-point correction of brightness and chromaticity. It can correct the brightness and chromaticity of each light point, effectively eliminate color difference, make the brightness and chromaticity of the entire screen highly uniform, and improve the display quality of the display screen. It supports data inspection. After replacing the receiving card of the large screen, it is free of debugging, and the engineering file can be inspected and repaired with one click.