文档介绍：目录
摘要………………………………………………………………………2
1 LED概述……………………….………………………………………3
LED发展历史介绍……………………………………………4
LED的发展前景…………….………………………5
2 LED显示屏概述………………………………………………………6
LED显示屏发展经历了三个阶……………………………7
…………………………………9
3结束语…………………………………………………………………11
致谢……………………………………………………………………12
参考文献……………………………………………………………12
LED、LED显示屏的发展历史、发展意义及前景
摘要发光二极管(英语:Light-Emitting Diode,简称LED) 是一种能发光的半导体电子元件。这种电子元件早在1962年出现,早期只能发出低光度的红光,之后发展出其他单色光的版本,时至今日能发出的光已遍及可见光、红外线及紫外线,光度也提高到相当的光度。而用途也由初时作为指示灯、显示板等;随着技术的不断进步,发光二极管已被广泛的应用于显示器、电视机采光装饰和照明。LED只能往一个方向导通(通电),叫作正向偏置(正向偏压),当电流流过时,电子与空穴在其内复合而发出单色光,这叫电致发光效应,而光线的波长、颜色跟其所采用的半导体材料种类与掺入的元素杂质有关。具有效率高、寿命长、不易破损、开关速度高、高可靠性等传统光源不及的优点。白光LED的发光效率,在近几捻来已经有明显的提升,同时,在每千流明的购入价格上,也因为投入市场的厂商相互竞争的影响,而明显下降。虽然越来越多人使用LED照明作办公室、家具、装饰、招牌甚至路灯用途,但在技术上,LED在光电转换效率(有效照度对用电量的比值)上仍然低于新型的荧光灯,是国家以后发展民用的去向! Light emitting diode (English: Light-Emitting Diode, referred to as LED) is a kind of semiconductor ponents capable of emitting light. This ponent first appeared in 1962, early only a low-luminosity red, after developing other monochromatic version, to make today's light throughout the visible light, infrared and ultraviolet spectrophotometry, also be enhanced to a considerable spectrophotometry. But also at the beginning of time as indicator lights, display board; with the progress of technology, the light-emitting diodes have been widely used in monitors, television lighting decoration and can only go in one direction conduction (electricity), a positive bias is called (forward bias), when the current flows, electron and hole in posite and emit monochromatic light, this is called electroluminescence effect, and the wavelength of light, color and semiconductor materials with the incorporation of impurities in the using the. Has the advantages of high efficiency, long service life, not easy to be damaged, switch has the advantages of high reliability, high speed, less than the traditional light source. The luminous efficiency of white LED,