LED dot matrix display driver scheme.P2.5 soft LED module

　　From the internal structure of LED dot matrix displays, it can be seen that the device should work in a dynamic scanning driving mode. As most LED cells are of high brightness type, the driving current of a single LED in a certain row or column can be narrow pulses, but its average current should be limited to 20mA. The forward voltage drop of most single LED in dot matrix displays is about 2V. However, the forward voltage drop of single LED in dot matrix displays with a large highlight of less than 10 is about 6V.

　　A large screen display system is generally composed of small modules composed of multiple LED dot matrices, which are combined in a building block manner. Each small module has its own independent control system. After being combined, a main controller is introduced to control the commands and data of each module. This method is simple and has the characteristics of easy development and maintenance.

　　There are two display modes for each module in the LED dot matrix display system: static and dynamic. The principle of static display is simple and easy to control, but the hardware wiring is complex. In practical applications, dynamic display generally adopts dynamic display mode. Dynamic display works by scanning, driven by narrow pulses with large peaks, continuously selecting each row of the display screen from top to bottom, and sending pulse signals representing graphic or textual information to each column. By repeatedly cycling the above operations, various graphic or textual information can be displayed.

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