The LED display is usually composed of the main controller, scanning board, display control unit, and LED display body, the main controller from the computer display card to obtain a screen of each pixel of each color brightness data, and then allocated to a number of scanning board, each scanning board is responsible for controlling the LED display on a number of lines (columns), and each line (columns) on the LED display signal is used in a serial manner through the various display control Cascade transmission of each display control unit directly facing the LED display body.
The work done by the main controller is to convert the computer display to match the signal of the card into the data and control signal format required by the LED display. The role of the display control unit is similar to that of the image display, which is generally composed of shift register latches with a gray-level control function. Only the scale of the video LED display is often larger, so should use the integration of a larger scale of the integrated circuit.
The role played by the scan trigger is the so-called top and bottom, on the one hand, it accepts the video signal from the main controller, on the other hand, the data belonging to this level to their respective display control units, but also the data that does not belong to this level to the next cascade of the scan trigger transmission. The video signal and LED display data, in space, time, sequence, and other aspects of the difference, all need to have a scanning board to assist.