The working principle of LED display

The main controller of the Led Display screen converts the computer display card signal into the data and control signal format required by the LED display screen. The main controller obtains the color brightness data of each pixel of a screen from the computer display card, and then assigns it to several scanning boards. Each scanning board is responsible for controlling several rows/columns on the LED display screen, and the LED display on each row/column The signal is cascaded and transmitted through each display control unit of the bank in a serial manner, and each display control unit directly faces the LED display body. The display control unit is generally composed of a shift register latch with a grayscale control function.

On the one hand, the scan panel accepts the video signal of the main controller, on the other hand, it transmits the data belonging to this level to its own display control units, and at the same time, it also transmits the data that does not belong to this level to the next cascaded scan panel. The differences in space, time, sequence and other aspects of video signal and LED display data need to be coordinated by a scanning board.