什么是LED?
What is a LED?
LED Light Emitting Diode（发光二极管）的缩写。广泛见于日常生活中，如家用电器的唆使灯，汽车后防雾灯等。LED的最明显特点是应用寿命长，光电转换效能高。
什么是LED？
在某些半导体材料的PN结中，注进的少数载流子与多数载流子复合时会把过剩的能量以光的情势开释出来，从而把电能直接转换为光能。PN结加反向电压，少数载流子难以注进，故不发光。这种利用注进式电致发光原理制作的二极管叫发光二极管，通称LED。
LED的发光色彩和发光效率与制作LED的材料和工艺有关，目前广泛应用的有红、绿、蓝三种。由于LED工作电压低（仅1.5-3V），能主动发光且有必定亮度，亮度又能用电压（或电流）调节，本身又耐冲击、抗振动、寿命长（10万小时），所以在大型的显示设备中，目前尚无其他的显示方法与LED显示方法匹敌。
把红色和绿色的LED放在一起作为一个像素制作的显示屏叫双基色屏或伪彩色屏；把红、绿、蓝三种LED管放在一起作为一个像素的显示屏叫三基色屏或全彩屏。制作室内LED屏的像素尺寸一般是2-10毫米，经常采用把几种能产生不同基色的LED管芯封装成一体，室外LED屏的像素尺寸多为12-26毫米，每个像素由若干个各种单色LED组成，常见的成品称像素筒或像素模块。
LED显示屏假如想要显示图象，则需要构成像素的每个LED的发光明度都必需能调节，其调节的精致程度就是显示屏的灰度等级。灰度等级越高，显示的图像就越细腻，色彩也越丰富，相应的显示把持系统也越复杂。在当前的技巧程度下，256级灰度的图像，色彩过渡已十分柔和，图像还原后果比拟令人满足。
材料显示，LED光源比白炽灯节电87%、比荧光灯节电50%，而寿命比白炽灯长20~30倍、比荧光灯长10倍。LED光源因具有节能、环保、长寿命、安全、响应快、体积小、色彩丰富、可控等系列奇专长处，被认为是节电降能耗的最佳实现道路。
What is a , LED?
In certain semiconductor material PN knot,Which will theminority carrier of infusion and majority carrier compound ShihPa redundant Chi earnestly resentment badger of form acquit comeout?Hereby Pa electric energy direct conversion for lightenergy. . 。PN knot add anti Hsiang voltage,Minority carrierdifficult to infusion,Therefore No, aglow. 。This kind of availoneself of infusion style electricity to aglow principium make the crystal diode of call led,Appellative LED?
LED aglow color concerned in luminosity and fabricator LED material Ho craft,Currently widely used have Hung , green , Lan three plants. 。Based on LED operating tensions low ( littles less than 1.5-3V),Neng initiative aglow and has at all events brightness,Brightness and employable voltage ( or electric current ) accommodate,In itself and endure buffets , shocks resistances moves , ages long ( 10 Wan hour ),Forasmuch in man- size display device,Currently Shang free from more bring out mode and LED bring out mode is equal to.? Do Pa red Ho green LED put together as a pixel the bring out of fabricator screen call Shuang base color screen or pseudo-color screen;Pa Hung , green , Lan three plants LED Kuan put together as a the bring out of pixel screens calls triply primitives colors screens or full
