什么是LED?
What is a LED?
LED Light Emitting Diode(發(fā)光二極管)的縮寫。廣泛見于日常生活中,如家用電器的唆使燈,汽車后防霧燈等。LED的最明顯特點是應用壽命長,光電轉換效能高。
什么是LED?
在某些半導體材料的PN結中,注進的少數(shù)載流子與多數(shù)載流子復合時會把過剩的能量以光的情勢開釋出來,從而把電能直接轉換為光能。PN結加反向電壓,少數(shù)載流子難以注進,故不發(fā)光。這種利用注進式電致發(fā)光原理制作的二極管叫發(fā)光二極管,通稱LED。
LED的發(fā)光色彩和發(fā)光效率與制作LED的材料和工藝有關,目前廣泛應用的有紅、綠、藍三種。由于LED工作電壓低(僅1.5-3V),能主動發(fā)光且有必定亮度,亮度又能用電壓(或電流)調(diào)節(jié),本身又耐沖擊、抗振動、壽命長(10萬小時),所以在大型的顯示設備中,目前尚無其他的顯示方法與LED顯示方法匹敵。
把紅色和綠色的LED放在一起作為一個像素制作的顯示屏叫雙基色屏或偽彩色屏;把紅、綠、藍三種LED管放在一起作為一個像素的顯示屏叫三基色屏或全彩屏。制作室內(nèi)LED屏的像素尺寸一般是2-10毫米,經(jīng)常采用把幾種能產(chǎn)生不同基色的LED管芯封裝成一體,室外LED屏的像素尺寸多為12-26毫米,每個像素由若干個各種單色LED組成,常見的成品稱像素筒或像素模塊。
LED顯示屏假如想要顯示圖象,則需要構成像素的每個LED的發(fā)光明度都必需能調(diào)節(jié),其調(diào)節(jié)的精致程度就是顯示屏的灰度等級?;叶鹊燃壴礁?,顯示的圖像就越細膩,色彩也越豐富,相應的顯示把持系統(tǒng)也越復雜。在當前的技巧程度下,256級灰度的圖像,色彩過渡已十分柔和,圖像還原后果比擬令人滿足。
材料顯示,LED光源比白熾燈節(jié)電87%、比熒光燈節(jié)電50%,而壽命比白熾燈長20~30倍、比熒光燈長10倍。LED光源因具有節(jié)能、環(huán)保、長壽命、安全、響應快、體積小、色彩豐富、可控等系列奇專長處,被認為是節(jié)電降能耗的最佳實現(xiàn)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