What is LED screen synchronous control and asynchronous control?

What is LED screen synchronous control and asynchronous control?

What is LED screen synchronous control and asynchronous control?
LED display control cards are divided into synchronous and asynchronous control cards. Synchronous control cards are mainly used on full-color LED electronic displays, while asynchronous control cards are mainly used on simple single- and double-color LED displays. The former must have a computer to output data synchronously in order to work. The latter can work as long as you edit the content and import it directly from a USB disk.

LED Display synchronization control card
Display synchronization control card is mainly used to display videos, graphics, notifications, etc. in real time. Mainly used for indoor or outdoor full-color large-screen displays. The display synchronization control system controls the display screen in a way that is basically the same as a computer monitor. It maps the image on the computer monitor in real time at an update rate of at least 60 frames/second. It usually has multi-grayscale color display capabilities. Can achieve multimedia advertising effect.

LED Display asynchronous control card
The display asynchronous control card is also called the display offline control system or offline card. It is mainly used to display various texts, symbols, graphics or animations. The screen display information is edited by the computer and pre-installed into the frame memory of the display screen through the RS232/485 serial port, and then displayed and played screen by screen, in a loop, with rich and varied display methods. The simple asynchronous control system of the display screen can only display digital clock, text, and special characters. In addition to the functions of a simple control system, the biggest feature of the asynchronous control system for graphics and text on the display screen is that it can control the display screen content in different areas. Supports analog clock display, countdown, pictures, tables and animation display. It has functions such as timer on/off, temperature control, humidity control, etc.

Features of LED display control card
The main features of LED display synchronization control card are: real-time, rich expressiveness, relatively complex operation, and high price.
The main features of LED display asynchronous control card are: simple operation, low price, and wide range of use.

The composition principle of LED display control card

Synchronization LED control card composition
The sending card displays the content to be displayed on the VGA monitor in a specific format and a certain broadcast order required by the LED display; on the other hand, the picture displayed on the VGA monitor is sent to the control board through the capture card, and the capture card It is an interface card used by VGA between the display card and the LED screen. The receiving card receives the video signal (control signal and data signal) transmitted from the sending card, separates the data in the video signal through planes, stores it in an external cache by field, and then reads it out in partitions and transmits it to the display driver screen.

The composition of LED asynchronous control card
LED asynchronous control card stores the display data edited by the computer in the display control system in advance. It will not affect the normal display of the LED display after the computer is shut down. To put it simply, you use a control card, use a computer to edit the content, or use a USB flash drive to place the content in the control card. Then there is only one control card to control the display screen, without computer control.
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