The LED display control card is responsible for receiving the screen display information from the computer serial port, placing it into the frame memory, and generating the serial display data and scanning control sequence required by the LED display screen according to the partition driving mode. LED display control system (LED display control system), also known as LED display controller, LED display control card.
LED display screen to display a variety of text, symbols and graphics. The screen display information is edited by computer, and is pre placed into the frame memory of LED electronic display screen through RS232 / 485 serial port, and then displayed and played on screen by screen. The display mode is rich and colorful, and the display screen works offline. LED display screen is widely used in various industries because of its flexible control, convenient operation and low cost. 

LED display control system is divided into:
LED screen asynchronous control system, LED display asynchronous control system, also known as LED display offline control system or offline card, is mainly used to display various characters, symbols and graphics or animation. The screen display information is edited by computer, and is pre placed into the frame memory of LED display screen through  serial port. Then it is displayed and played on screen by screen, and the display mode is rich and colorful There are many changes. Its main features are: simple operation, low price and wide range of use. The simple asynchronous control system of LED display screen can only display digital clock, text and special characters. In addition to the function of simple control system, the biggest feature of the asynchronous control system of LED electronic display screen is that it can control the display screen content in different regions, and support analog clock display, countdown and graph Film, table and animation display, with timing switch on and off, temperature control, humidity control and other functions;

LED display synchronous control system, LED display screen synchronous control system, mainly used for real-time display of video, text, notice, etc., mainly used for indoor or outdoor full-color LED large screen display. LED display synchronous control system controls the working mode of LED display screen, which is basically equivalent to the computer monitor. It maps the computer monitoring point by point with the update rate of at least 60 frames per second The image on the device usually has the ability of multi gray color display, which can achieve the effect of multimedia advertisement. Its main characteristics are: real-time, rich expression, more complex operation, high price. A set of LED display synchronous control system is generally composed of sending card, receiving card and DVI display card.