Modular LED large-screen display design has the basic principle is to divide the entire display into a number of the same size, the same function of the display module, and the other with a central control module control, synchronization of all display module operation, to achieve the overall coordination of the display. So the system consists of two parts: display module and control module.
The display module is actually the same size of the small LED driver board, can drive LED array, with the basic display function, and can receive data and commands from the control module, in addition to some commonly used display such as flashing, rolling, etc. are also included in the display Module. The existing national standard dot matrix Chinese character library has 16 × 16 and 24 × 24 two, taking into account the convenience of software and hardware capabilities, we show the module as 16 × 16 dot matrix size.
The control module is responsible for controlling the display modules and sending data and commands to each display module. The control module stores the lattice data information to be displayed and transmits the data to each display module at regular intervals. Control module also comes with a small keyboard and universal asynchronous serial port, which can operate with the keyboard, you can also use the computer control, you can also use the computer to update the control module data.
Display module and control module between the bus connection, we use the I2C bus. The design of the whole system has a lot of freedom: the number of display modules controlled by the control module can be changed, the arrangement of the display module can also be changed (such as 16 LED display modules, either 2 × 8 or 4 × 4 ), The same screen can save a number of conditions with the information were displayed, each information lattice size can be different, more than the size of the screen information can be displayed. This basically can meet a variety of needs.