Ib qho LED (lossis Lub Teeb Emitting Diode) yog lub teeb pom kev zoo uas tawm lub teeb lub zog nyob rau hauv daim ntawv ntawm "photons" thaum nws mus rau pem hauv ntej. Hauv electronics, peb hu cov txheej txheem no electroluminescence. Cov xim ntawm lub teeb pom kev tawm los ntawm LEDs muaj xws li xiav mus rau xim liab thiab txiav txim siab los ntawm lub spectral wavelength ntawm lub teeb emitted, uas nyob rau hauv lem nyob ntawm ntau yam impurities uas tau ntxiv rau cov khoom semiconductor thaum lawv tsim khoom.
LEDs muaj ntau yam zoo dua li cov teeb pom kev zoo ib txwm muaj, thiab tej zaum qhov tseem ceeb tshaj plaws ntawm lawv yog lawv qhov me me, ruaj khov, ntau xim, tsis tshua muaj nqi thiab muaj peev xwm yooj yim, muaj peev xwm sib cuam tshuam nrog ntau yam khoom siv hluav taws xob hauv digital. daim duab.
Tab sis qhov txiaj ntsig tseem ceeb ntawm LEDs yog tias, vim lawv qhov me me, qee qhov ntawm lawv tuaj yeem ua kom muaj zog hauv ib pob compact, tsim cov npe hu ua xya ntu qhia.
Qhov ntsuas xya ntu muaj xya LEDs (li no nws lub npe),teem rau hauv ib lub duab plaub, raws li qhia hauv daim duab. Txhua ntawm xya LEDs yog hu ua ib ntu vim tias, thaum teeb, ntu ua ib feem ntawm tus lej (tus lej lej lossis hexadecimal). Qee zaum ib qho 8th ntxiv LED yog siv hauv ib pob. Nws ua haujlwm los tso saib tus lej lej (DP), yog li tso cai rau tus lej kom pom yog tias ob lossis ntau dua 7-ntu qhia tau txuas ua ke los sawv cev cov lej ntau dua kaum.
Txhua ntawm xya ntu ntawm LED ntawm cov zaub yog txuas nrog cov ntaub ntawv sib txuas ntawm kab sib cuag, nyob ncaj qha rau ntawm cov ntaub ntawv yas ntawm qhov ntsuas. Cov pins LED tau sau ib txog g, sawv cev rau txhua ntu. Lwm cov pins ntawm LED ntu yog sib txuas thiab tsim ib lub davhlau ya nyob twg.
Yog li, kev tsis ncaj ncees rau pem hauv ntej siv rau cov pins sib txuas ntawm cov ntu LED hauv qee qhov kev txiav txim yuav ua rau qee ntu kom pom thiab qhov seem kom nyob twj ywm, yog li qhia qhov xav tau tus lej qauv coj los qhia ntawm cov zaub. Qhov no tso cai rau peb sawv cev rau txhua tus ntawm kaum tus lej ntawm 0 txog 9 ntawm 7-seg zaub.
Cov khoom tso tawm feem ntau yog siv los txiav txim seb hom 7-ntu zaub. Txhua cov zaub LED muaj ob txoj kev sib txuas, ib qho yog hu ua "anode" thiab lwm yam, feem, yog hu ua "cathode". Yog li ntawd, xya-ntu LED taw qhia tuaj yeem muaj ob hom kev tsim hluav taws xob - nrog rau ib qho cathode(OK) thiab ntau anode (OA).
Qhov txawv ntawm ob hom kev qhia no yog tias hauv OK tsim, cathodes ntawm tag nrho 7 ntu yog txuas ncaj qha rau ib leeg, thaum nyob rau hauv cov qauv anode (OA), cov anodes ntawm tag nrho 7 ntu yog txuas rau ib leeg. Ob lub tswv yim ua haujlwm raws li hauv qab no.
- Common cathode (OK) - sib txuas cathodes ntawm txhua ntu LED muaj qhov laj thawj "0" qib lossis txuas nrog cov xaim sib xws. Cov ntu ntawm tus kheej raug teeb pom kev los ntawm kev tsav lawv cov anode tso tawm mus rau lub logic "siab" lossis logic "1" los ntawm kev txwv tsis pub dhau mus rau kev tsis ncaj ncees rau tus kheej LEDs.
- Common anode (OA) - cov anodes ntawm tag nrho cov ntu LED tau sib xyaw ua ke thiab muaj qib logic ntawm "1". Tus kheej ntu ntawm qhov taw qhia ci ntsa iab thaum txhua qhov tshwj xeeb cathode txuas nrog hauv av, logic "0" lossis lub teeb liab muaj peev xwm tsawg los ntawm qhov tsim nyog limiting resistor.
Feem ntau, cov lus qhia txog xya ntu yog nrov dua, vim tias ntau lub logic circuits tuaj yeem kos tau tam sim no ntau dua li cov khoom siv hluav taws xob tuaj yeem muab tau. Tsis tas li ntawd nco ntsoov tias cov khoom siv cathode tsis yog hloov ncaj qha rau hauv Circuit Court rau cov khoom siv anode. Thiab vice versa - qhov no yog sib npaug rau tig rau lub LEDs nyob rau hauv lub opposite kev taw qhia, thiab yog li ntawd tsis muaj lub teeb emission yuav tshwm sim.
Txawm hais tias qhov ntsuas 7-ntu tuaj yeem suav tias yog ib qho zaub, nws tseem yogmuaj xya tus neeg LEDs nyob rau hauv ib pob, thiab xws li cov LEDs yuav tsum tau tiv thaiv los ntawm overcurrent. LEDs tsuas yog tawm lub teeb thaum lawv mus rau pem hauv ntej tsis ncaj ncees lawm, thiab qhov nyiaj ntawm lub teeb uas lawv tawm yog proportional rau pem hauv ntej tam sim no. Qhov no tsuas yog txhais tau hais tias qhov kev siv ntawm LED nce kwv yees li linearly nrog nce tam sim no. Yog li, txhawm rau kom tsis txhob ua rau lub LED puas, qhov tam sim no rau pem hauv ntej yuav tsum tau tswj thiab txwv kom muaj txiaj ntsig zoo los ntawm kev txwv sab nraud.
Cov ntsuas xya ntu no hu ua static. Lawv qhov tsis zoo tseem ceeb yog qhov ntau ntawm cov khoom tawm hauv pob. Txhawm rau tshem tawm qhov tsis txaus no, cov tswv yim rau kev tswj hwm ntawm xya ntu yog siv.
Qhov ntsuas xya ntu tau txais kev muaj koob npe nrov ntawm cov kws tshaj lij xov tooj cua vim nws yooj yim siv thiab nyeem tau yooj yim.
