1、安徽蚌埠机电技师学院应用电子 技术专业 毕业论文 第 1 页 共 12 页 目 录 摘要 2 1 LED概述 . 3 1.1 LED发展历史介绍 4 1.2 LED 的发展前景 . 5 2 LED 显示屏概述 6 2.1 LED 显示屏发展经历了三个阶 7 2.2 我国 LED 显示屏发展现状 9 3结束语 11 致谢 12 参考文献 12 安徽蚌埠机电技师学院应用电子 技术专业 毕业论文 第 2 页 共 12 页 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
2、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
3、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 electronic components capable of emitting light. This electronic com
4、ponent first appeared in 1962, early only a low-luminosity red, after developing other monochromatic version, to make todays light throughout the visible light, infrared and ultraviolet spectrophotometry, also be enhanced to a considerable spectrophotometry. But also at the beginning of time as indi
5、cator lights, display board； with the progress of technology, the light-emitting diodes have been widely used in monitors, television lighting decoration and lighting.LED can only go in one direction conduction (electricity), a positive bias is called (forward bias), when the current flows, electron
6、 and hole in the composite 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,
7、switch has the advantages of high reliability, high speed, less than the traditional light source. The luminous efficiency of white LED, in recent years there have been significantly improved, at the same time, in every thousand lumens of the purchase price, but also because of investment firms comp
8、eting, dropped obviously. Although more and more people are using LED lighting for office furniture, decoration, signs, even street lamp uses, but technically, LED in the photoelectric conversion efficiency (the ratio of effective illumination electricity) remains below the fluorescent lamp model, is the country after the development of civilians whereabouts!
