Since the mid-1980s, there is monochromatic and multicolor displays,, initially text screen or movie screen on the LED display. In the early 1990s, the development of computer technology and integrated circuit technology makes LED video display technology to achieve, TV images directly can be showed on the screen, especially in the mid-1990s, blue and green high brightness LED successfully developed and put into production quickly to make room external screen applications greatly expanded in the area ranging from 100-300m. currently the LED display in stadiums, Square, the venue and even streets, shopping malls have been widely used, full-color US NASDAQ on Times Square, the most famous of the screen area of 120 ft × 90 ft equivalent to 1005m, the 19 million ultra-bright blue, green the red LED is made. in addition, the securities market screen, bank rate screen, screen, and other aspects of application rates also accounted for a large proportion of recent highway, the information screen aspect Viaduct also have a larger development. in this light-emitting diode applications become the size of the field, the formation of new industries, and can be expected to have a more stable growth [1].