Modular design of Character LCD Modules large screen display

TFT LCD Misplays large screen display due to its eye-catching, content, flexibility, etc., have been increasingly used in advertising, information dissemination, traffic signs and other public places, and achieved good results. LED display digital display is divided into two main numbers and dot-matrix display, this article discusses only dot matrix display. The current LED display basically start with the user requests, the manufacturer needs to be customized according to which, each time repeating design circuits and mechanical structure, resulting in a waste of resources, but if the user needs to change, alteration will be very difficult.
In fact, regardless of the size of the display, the principle is the same, so they could design a standardized, modular LED display, to be different, just proud of the corresponding module can be combined. This article describes is a modular LED display, you can change the size according to need to be flexible, and can be run independently from the computer, you can also achieve such as flickering, scrolling and other special effects.
Fundamental
The basic design idea is the same as the size of the entire screen is divided into several, same function display module, and the other with a central control module control, synchronous operation of all display modules, to achieve the overall coordination of the display.
Therefore, this system mainly consists of two parts: the display module and a control module.
The display module is the same actual size of a small LED driving board, to drive the LED array, a basic display, and can receive data from the control module and commands used in addition to some of the display, such as blinking, scrolling, also included in the display module. Existing GB lattice Store with 16 × 16 and 24 × 24 two kinds, taking into account the convenience of writing software and hardware capabilities, we display module as a 16 × 16 matrix size.
The control module is responsible for controlling each display module, each display module to send data and commands. Control module lattice data stored information to be displayed, timed to each display module downstream. The control module also comes with a small keyboard and a universal asynchronous serial port, which you can use the keyboard can also be controlled by computer, you can also use computers to update the data within the control module.
Between the display module and the control module connected with the bus, we have selected the I2C bus.
The system designed for use with a great degree of freedom: the control module controls the display of the number of modules can be changed, the arrangement of the lcd graphic display can be changed (such as the display module 16 can be either 2 × 8 may also be 4 × 4) , with a display on certain conditions, the use of information can be stored separately show the lattice size of each message can be different than the screen size information can scroll displayed. So essential to meet diverse needs.