【正文】 diums, convention centers, squares and other public places, which will bring the domestic largescreen fullcolor era. With the rapid development of LED materials market, surface mount device is available from 2001, mainly used in indoor full color, and its high brightness, colorful, low temperature characteristics, the point spacing can be adjusted by different price Requirements were accepted, in just two years time, product sales have more than 300 million dollar, surface mount fullcolor LED display application market entered the new century. To meet the 2008 Olympic Games, downsizing plan, Liard developed a surface mount dual color displays, a lot of time for the training center and game scoring. Full color in Olympic venues, in order to tighten investment, full color way is mostly detachable, live during the Olympic Games as a tool can be used for rental after the event, as the performance of national policies such as public places, tools released by In this way cost recovery as soon as possible. On the market, China39。s accession to WTO, Beijing39。s successful Olympic bid and so on, into the development of LED display industry, a new opportunity. Domestic LED display market continues to grow, currently in the domestic market, domestic LED display market share of nearly 95%. LED display l market capacity is expected to 30% a year growth rate. Currently, LED display manufacturers concentrated primarily in Japan, North America, LED made in china manufacturers in which the insignificant share of exports. According to inplete statistics, the world, there are at least 150 manufacturers full color, in which products are plete, the larger pany has some 30 or so.Third LED advantages Conductor lightemitting diode (LED) as a thirdgeneration semiconductor lighting source. This fantastic product has a lot of advantages: (1) efficient light: spectra of almost all concentrated in the visible light frequency, the efficiency can reach 80% 90%. (2) high quality of light: not as a result of spectrum UV and infrared, there is no heat, no radiation, is typically a green light illumination. (3) consumption of the small: single power generally , through the cluster can be tailored to meet different needs, and waste very little. (4) long life: flux attenuation to 70% of the standard life expectancy is 100,000 hours. A semiconductor light can be used under normal circumstances 50 years, even if the long life of the people, life will be used up to two lights. (5)durable and reliable: No tungsten wire, glass and other easily damaged ponents, nonnormal retirement rate is very small, very low maintenance costs. (6)the application of flexibility: small size, can flat pack, easy to develop into a short thin products, make point, line, face various forms of specific applications. (7) Security: working voltage or less in between the current 2070mA in between. (8) green: recyclable waste, no pollution, unlike fluorescent lamps containing mercury as ingredients. (9) response time is short: to adapt to frequent and highfrequency switching operation of occasions.Fourth Classification of LED display 1, color by color can be divided into Singlecolor display: Single color (red or green). Twocolor display: red and green dualcolor, 256 gray scale levels, can display 65,536 colors. Fullcolor screen: red, green, blue color, 256 grayscale full color display can display more than 16 million kinds of colors. 2, according to display device classification LED Digital Display: 7 segment display devices for the digital control code, suitable for production of the clock screen, the interest rate screens, showing the number of electronic display. LED dotmatrix graphic display: display device is arranged by a number of uniform position of the dotmatrix LED display modules, suitable for broadcast text, image information.3, by using the occasion categories Indoor Display: LED spots smaller, general Φ3mm Φ8mm, shows the general area of a few to more than ten square meters. Outdoor Display: dozens of square meters in size to several hundred square meters, high brightness, can work in the sun, with wind, rain, water resistant. 4, classified according to light spot diameter Indoor screen: Φ3mm, , Φ5mm, Room external screen: Φ10mm, Φ12mm, Φ16mm, Φ19mm, Φ20mm, Φ21mm, Φ22mm, Φ26mm Room external screen as the basic unit of light emitting tube, LED tube principle is a set of red, green, and blue lightemitting diode sealed in a plastic barrel and jointly develop5, Display a static, horizontal scroll, vertical scroll and flip display. One block module control drive 12 (up to control 24) 8X8 Dot Matrix, a total of 16X48 dot matrix (or 32X48 dot matrix), is a single block of MAX7219 (or PS7219, HD7279, ZLG7289 and 8279, and the like LED display driver module) 12 times (or 24 times)! Can use cascade approach the position of any large dot matrix display. Effects, good power consumption, and the MAX7219 circuit than the use of lower cost.Fifth LED applications It is a semiconductor lightemitting diode by controlling the display, which probably look like that from lots of small red lights usually formed by the bright lights off to show character. That used to display text, graphics, images, animations, quotes, video, video signals and other information on the display screen. Graphic display and LED display into the video display by the LED matrix blocks. Graphic displays can be synchronized with the puter display Chinese characters, English text and graphics。 video display using microputer control, graphics, images, and Mao, realtime, synchronization, clear message to the broadcast of a variety of information dissemination, but also shows two dimensional, threedimensional animation, video, TV, VCD programs and live on. LED display shows the screen brightly colored, threedimensional sense of strong, static, such as painting, moving as the film is widely used in finance, tax, business, telemunications,