In 1923, Rosoff (Lossen.ow) from time to time in the study of semiconductor impurities SIC PN junction light emission, developed a light-emitting diode (LED: Light Emitting Diode), has been taken seriously. With the rapid development of electronics industry in the 60's, the rapid development of display technology, people have developed laser display PDP plasma display panel, LCD liquid crystal display, light emitting diode LED, electrochromic display ECD, electrophoresis EPID and other technologies. Because the production and processing of semiconductor gradually mature and perfect, light-emitting diode displays have become increasingly dominant in the solid position. LED widespread attention and the reason why the rapid development, because there is activity itself, a lot of advantages. For example: high brightness, low voltage, low power consumption, ease of integration, driven simple, long life, impact resistance and stable performance, and its development prospect is broad. Are now moving higher brightness, higher weather resistance and light density, light uniformity, full color development.
The early 80s, with the development of the computer, CGA display come out, it has a resolution of 320 * 200 four colors, in a short display of 10 years has experienced CGA, EGA, SEGA, VGA, SVGA, the development of the ultra-high resolution, showing the development of accuracy from 320 to 1600 * 200 * 1250, from four colors to 32-bit true color, scanning frequency of the development from 15.7K to 150K. Displays works by receiving signals from the host in the form of reduced light display, with the development one needs a large-screen device, so have a projector, but its brightness can not be used in natural light, so there LED display (screen), it has a large angle, high brightness, colorful features. LED display has a wide range of applications, in sports stadiums, large screen display system for live games and sports score, time, replay, etc.; in the transportation industry, you can display the road operation; in the financial industry, it can, real-time display of financial information, such as stocks, exchange rates, interest rates, etc.; in the business of Posts and Telecommunications System, you can display a notification to the majority of customers, messages, advertising and so on. According to the survey, people receiving the information have 2 / 3 of the information is obtained through the eyes. Display technology is also used in industrial production, military, medical units, public security systems and even aerospace business and other economic, social life and military fields, and play an important role, display technology has become a modern human social life, an essential technology.
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