Dab tsi yog LED?

Kuj pom laser diode.

Lub teeb xa hluav taws xob (LED) yog cov khoom siv hluav taws xob semiconductor uas tso tawm lub teeb pom kev thaum hluav taws xob hluav taws xob hla nws. Lub teeb tsis ci tshwj xeeb, tab sis nyob rau hauv feem ntau LEDs nws yog monochromatic, tshwm sim ntawm ib nthwv dej. Tshaj tawm ntawm ib qho LED tuaj yeem yog xim liab (ntawm lub teeb ntawm kwv yees li 700 nanometers) rau xiav-violet (li ntawm 400 nanometers). Qee qhov LED pom emit infrared (IR) lub zog (830 nanometers lossis ntev dua); xws li cov khoom siv tau paub raws li ib qho infrared-emitting diode (IRED).

Ib qho hluav taws xob LED lossis IRED muaj ob lub ntsiab lus ntawm cov khoom siv hu ua P-hom semiconductors thiab N-hom semiconductors. Ob lub ntsiab lus no tau muab tso ncaj qha, tsim ib cheeb tsam hu ua PN hlausCov. Hauv kev hwm no, LED lossis IRED zoo li feem ntau lwm hom diode, tab sis muaj cov sib txawv tseem ceeb. Cov LED lossis IRED muaj lub pob tshab, tso cai rau pom lossis IR zog hla dhau. Tsis tas li, LED lossis IRED muaj PN-hlauv qhov chaw loj uas nws lub ntsej muag kom haum rau daim ntawv thov.

Cov txiaj ntsig ntawm LEDs thiab IREDs, piv nrog cov khoom uas tsis sib xws thiab fluorescent illuminating, suav nrog:

• Yuav tsum muaj hluav taws xob tsawg: Feem ntau hom tuaj yeem ua tiav nrog cov khoom siv roj teeb hluav taws xob.

• Siab efficiency: Feem ntau ntawm cov fais fab xa mus rau ib qho hluav taws xob LED lossis IRED hloov dua siab tshiab rau hauv hluav taws xob hauv qhov xav tau, nrog kev ua kom muaj cua sov tsawg.

• Lub neej ntev: Thaum txhim kho kom zoo, ib qho LED lossis IRED tuaj yeem ua haujlwm rau kaum xyoo.

Cov kev thov raug suav nrog:

• Qhov taw qhia teeb: Cov no tuaj yeem yog ob-xeev (piv txwv li, rau / tawm), bar-graph, lossis cov ntawv nyeem-ntawv nyeem.

• Cov vaj huam sib luag LCD backlighting: Cov xaim hluav taws xob tshwj xeeb yog siv nyob rau hauv cov tiaj tus kheej lub tshuab computer.

• Cov ntaub ntawv fiber ntau kis: Yooj yim ntawm cov kev hloov kho tso cai dav dav kev sib txuas lus nrog cov suab nrov tsawg, ua rau muaj kev kub ceev thiab raug.

• Chaw taws teeb tswj: Yuav luag txhua qhov kev lom zem hauv tsev “siv” mus siv IRED kom xa cov ntaub ntawv mus rau hauv chav loj.

• Kws kho qhov muag: Cov theem hauv tshuab hluav taws xob tuaj yeem sib txuas ua ke yam tsis muaj kev cuam tshuam.