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1、The development and application of LEDAs the further development of display device and technology, screen display system has been widely used in national economy, LED display as a carrier for displaying information is one of major media. LED display is composed by using LED lattice module or pixel u
2、nit. As computer technology developed, LED digital has the characteristics of high reliability, long life, high cost performance, low using cost, strongly adaptive capacity to environment which can be directly driven without reducing drive, therefore, it has been playing a importance role in the fie
3、ld of flat display. and for a long period of time, there are considerable room for development. So, it widely used in the financial markets, hospitals, stadiums, airports, terminals, stations, highways and other public places for information display and advertising.First LED Summary LED (Light Emitt
4、ing Diode), light-emitting diode, is a solid state semiconductor devices, which can be directly converted into electricity to light. LED is the heart of a semiconductor chip, the chip is attached to one end of a stent, is the negative side, the other end of the power of the cathode, the entire chip
5、package to be epoxy resin. Semiconductor chip is composed of two parts, part of the P-type semiconductor, it inside the hole-dominated, the other side is the N-type semiconductor, here is mainly electronic. But linking the two semiconductors, among them the formation of a PN junction. When the curre
6、nt through the wires role in this chip, will be pushing e-P, P zone in the hole with electronic composite, and then to be issued in the form of photon energy, and this is the principle of LED luminescence. The wavelength of light that is the color of light, is formed by the PN junction of the decisi
7、ons of the material.Second LED developmentThe development of LED display can be divided into the following phases: first phase 1990 to 1995, mainly monochrome and 16 color graphics screen. Used to display text and simple images, mainly used in railway stations, financial securities, banks, post offi
8、ces and other public places, as public information display tools. The second stage is from 1995 to 1999, there have been 64, 256 level gray-scale two-color video screen. Video control technology, image processing, optical fiber communication technology applications will enhance the LED display to a
9、new level. LED display control LSI chips special at this time developed by domestic companies, and can be applied. The third stage, from 1999, red, pure green, blue LED in bulk into China, while domestic enterprises in-depth research and development work, using red, green, and blue LED production of
10、 full-color display has been widely used , poured into sports stadiums, convention centers, squares and other public places, which will bring the domestic large-screen full-color era. Third LED advantagesConductor light-emitting diode (LED) as a third-generation semiconductor lighting source. This f
11、antastic 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%. The luminous efficiency of incandescent visible light efficiency of almost 10% -20% only. (2) high quality of light: not as a result of
12、 spectrum UV and infrared, there is no heat, no radiation, is typically a green light illumination. (3) energy consumption of the small: single power generally 0.05-1w, through the cluster can be tailored to meet different needs, and waste very little. As a light source, under the brightness in the
13、same power consumption of only ordinary incandescent 1/8-10. (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) du
14、rable and reliable: No tungsten wire, glass and other easily damaged components, non-normal 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 sp
15、ecific applications. (7) Security: working voltage 1.5-5v or less in between the current 20-70mA 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 high-frequency switching operation
16、of occasions. In recent years, Chinas LED display related technology has also been made a fast and great development, Because of early stage LED material and component restriction, LED display applications were not widely expand. The other hand, display control technology basically is a communication control method which objectively affects the display effect. Thus resulting in the early LED displays in the country rarely, product based on double primary color which i
