LED display is formed by a light-emitting diode LED digital tube, LED dot matrix displays. LED devices commonly used two kinds: digital tube and lattice.
LED display shows the interface by drive can be divided into static and dynamic display shows two display modes, dynamic display of the scan by SCM software or specialized hardware to complete; according to CPU interface to transfer data to the display mode can be divided into parallel transmission Lee serial transmission two data transmission.
· Static display, in addition to change the display data period, the monitors are powered on display state, each monitor is powered duty cycle of approximately 100%. Static display is to show the advantages of stable, high brightness; drawback is occupied by hardware resources (such as I / O ports, drives, etc.) and more.
· Dynamic display, N a display of data drives occupy a display of each monitor is powered on duty time 1 / N. Dynamic display of the advantage is to save hardware resources (such as LO port, driver, etc.); drawback is the CPU using software more time scan, the software scans compared with hardware scan increases hardware costs. In addition, more dynamic display digits, the display brightness will be affected.
Parallel data transfer interface displayed when the transfer is done in parallel, its transmission speed, but the occupied I / O interface and more. Serial transmission interface in the transmission display data in a serial manner, the advantage is occupied by LO less interface, simple wiring, the disadvantage is the slow transfer speed.
LED large screen display due to its eye-catching, content, flexible features, has 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 major categories and dot-matrix display, this article discusses only dot matrix display.
In fact, regardless of the size of the display, the principle is the same, so they could design a standardized, modular LED display, for different needs, only a random combination of the corresponding module.
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