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什么是LED? What is a LED?  

2008-09-15 20:04:55|  分类: 大屏幕显示系统 |  标签: |举报 |字号 订阅

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LED Light Emitting Diode(发光二极管)的缩写。广泛见于日常生活中,如家用电器的指示灯,汽车后防雾灯等。LED的最显著特点是使用寿命长,光电转换效能高。

什么是LED??

在某些半导体材料的PN结中,注入的少数载流子与多数载流子复合时会把多余的能量以光的形式释放出来,从而把电能直接转换为光能。PN结加反向电压,少数载流子难以注入,故不发光。这种利用注入式电致发光原理制作的二极管叫发光二极管,通称LED。?

LED的发光颜色和发光效率与制作LED的材料和工艺有关,目前广泛使用的有红、绿、蓝三种。由于LED工作电压低(仅1.5-3V),能主动发光且有一定亮度,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式与LED显示方式匹敌。?

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,常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显示屏如果想要显示图象,则需要构成像素的每个LED的发光亮度都必须能调节,其调节的精细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,相应的显示控制系统也越复杂。在当前的技术水平下,256级灰度的图像,颜色过渡已十分柔和,图像还原效果比较令人满意。?

资料显示,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、可控等系列独特优点,被认为是节电降能耗的最佳实现途径。

What is a , LED??

In certain semiconductor material PN knot, Which will the minority carrier of infusion and majority carrier compound ShihPa redundant Chi earnestly resentment badger of form acquit come out? Hereby Pa electric energy direct conversion for light energy. . 。PN knot add anti Hsiang voltage, Minority carrier difficult to infusion, Therefore No, aglow. 。This kind of avail oneself 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 Pared Ho green LED put together as a pixel the bring out of fabricator screen call Shuangbase 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 colors screens. 。Studioes inner LED the pixel of sizes general are 2-10 centimeters, Often adopt Pa several plant Neng accrue different base color LED Kuan core capsulation Cheng an organic whole, Outdoor LED the pixel of sizes manys for 12-26 centimeters, Each pixel consist of several Ke all kinds monochromatic LED, Used to the completed product of say pixel tube or pixel mold piece.??

Do if LED bring out screen feel like display frame elephant??

Hen call for component the each of pixel LED aglow brightness Tu has got to Neng accommodate, Its accommodative delicate extent the same bring out that the gray scale of. . 。Gray scale Yueh Kao, Apparent the eikon of just Yueh fine and smooth, Color also Yueh abundance, The display control of corresponding system also Yueh complex. 。In the present ?technic horizontal down,256 grades the eikons of draies levels, Color transition had completely soft, Image restoration effect compare desirable. Do Data display, LED light source compare filament lamp section electricity 87%, compare fluorescent lamp section electricity 50%,And ages compare Pai flaming lamps long 20~30 diameters , compare fluorescent lamps long 10 diameters. 。LED lights sources because endowed with conserve energies, environmental protections , long lives , An Chuan , responds fasts , cubage littles , colors abundance , cans accuse and so on series peculiars advantages, known a section electricity fall of the best of accomplish approach.
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