LED display controller

- Apr 03, 2020-

LED display controller, also known as LED asynchronous control system or LED display control card, is the core component of LED graphic display. Responsible for receiving screen display information from the computer's serial port, placing it into the frame memory, and generating the serial display data and scan control timing required by the LED display screen in a partition-driven manner.


Make up

Send card



Real-time and expressive



LED asynchronous control system


The LED display mainly displays various texts, symbols and graphics. The screen display information is edited by the computer, and it is pre-set into the frame memory of the LED display screen through the RS232 / 485 serial port, and then displayed and played back and forth on a screen-by-screen basis. The display is colorful and can work offline. Due to its flexible control, convenient operation, high stability and long service life, LED display screens have been widely used in various industries in society.


LED display synchronization controller

LED display synchronization controller, mainly used for indoor or outdoor full color large screen display for real-time display of video, graphics, notifications, etc. LED display synchronous control system. The working mode of controlling LED display is basically the same as that of a computer monitor. It maps the image on the computer monitor in real time at a refresh rate of at least 60 frames per second, usually with multiple gray colors. Display capabilities can achieve the effect of multimedia advertising. Its main characteristics are: real-time, rich expressiveness, complicated operation and high price. A set of LED display synchronous control system generally consists of a sending card, a receiving card, and a DVI graphics card.


Send card


LED display asynchronous controller

LED display asynchronous controller is also called LED display offline control system or offline card. Mainly used to display a variety of text, symbols and graphics or animation. The screen display information is edited by a computer. It is pre-installed into the frame memory of the LED display via the RS232 / 485 serial port, and then displayed and played back and forth on a screen-by-screen basis. The display mode is colorful and varied. Its main characteristics are: simple operation, low price and wide range of use. LED display simple asynchronous control system can only display digital clock, text, special characters. In addition to the simple control system function of the LED display graphic asynchronous control system, the biggest feature is that it can control the display screen content by area. Support analog clock display, countdown, picture, table and animation display. With timing switch, temperature control, humidity control and other functions.


The composition of the synchronization controller

The sending card is to display the content to be displayed on the VGA display according to the specific format and certain broadcasting order required by the LED display screen; on the other hand, the picture displayed on the VGA display is sent to the control board through the capture card, and the capture card It is a VGA interface card used between the display card and the LED screen.


The receiving card receives the video signals (control signals and data signals) transmitted by the sending card, separates the data in the video signals through the bit plane, stores them in the external buffer in separate fields, and then reads them out in partitions and sends them to the display driver screen.


LED display control card LED control card


Composition of asynchronous controller

The edited display data of the computer is stored in the display control system in advance. After the computer is turned off, it will not affect the normal display of the LED display. Such a control system is an asynchronous control system card.