This paper described a new system for small LED display, which was based on the computer and MCU master-slave structure. The focus of host computer design is the extraction of Chinese characters dot-matrix data and the transmission of information using infrared serial communication. The lower computer has already accomplished dynamic LED display design with LPC900 series single-chip and the hardware drive circuit of LED display. The LED display system possessed a high performance-price ratio, and could be widely used in automated instrumentation panel and sensor online shows. This system also gets other extraordinary characters like small size (45×80×3mm3), light weight, low (power) consumption, and simple operation and so on.