LED zaub yog cov khoom lag luam nrov tshaj plaws hauv cov chaw pej xeem, tab sis qee qhov LED zaub yuav txo qis hauv qhov ci thaum lub sijhawm. Yog tias lub vijtsam LED pom tias qhov ci ntsa iab tsis ncav cuag tus nqi xav tau tom qab siv, koj tuaj yeem sim ua cov hauv qab no los ua kom qhov ci ntsa iab. YONGS LED zaub qhia txhua tus neeg tias qhov ci ntsa iab tsis txaus, yog li sim cov txheej txheem no.
1. Hloov tam sim no ntws los ntawm LED. Feem ntau, kev ua haujlwm tsis tu ncua ntawm LED raj yog li 20 mA. Tsuas yog rau qhov tshwm sim saturation ntawm cov liab LED, qhov ci ntawm lwm cov LEDs yog qhov sib piv rau qhov ntws tam sim no.
2. Siv qhov pom kev inertia ntawm tib neeg lub qhov muag, lub pulse width modulation method yog siv los ua kom tiav grayscale tswj, uas yog, lub teeb mem tes dav (piv txwv li lub voj voog lub luag hauj lwm) yog ib ntus hloov, tsuav yog lub sij hawm rov qab teeb pom kev zoo yog luv txaus. (piv txwv li qhov refresh zaus yog siab txaus)), tib neeg lub qhov muag tsis tuaj yeem hnov qhov kev co ntawm lub teeb-emitting pixels. Txij li thaum pulse width modulation yog tsim nyog rau kev tswj cov digital, niaj hnub no, thaum microcomputers feem ntau siv los muab cov ntsiab lus ntawm LED, yuav luag tag nrho LED tswj systems feem ntau yog tsim los ntawm peb qhov tseem ceeb: lub ntsiab tswj lub thawv, lub scanning board thiab cov zaub tswj cov khoom . Lub thawv tswj lub ntsiab tau txais cov ntaub ntawv xim ci ci ntawm lub vijtsam pixel los ntawm lub khoos phis tawj cov ntawv qhia zaub mov, thiab tom qab ntawd rov faib nws mus rau ntau lub scanning boards. Txhua lub scanning board yog lub luag hauj lwm rau kev tswj ob peb kab (kem) ntawm lub LED zaub, thiab txhua kab (kem) ) ntawm lub LED zaub tswj teeb liab kis tau tus mob nyob rau hauv ib tug serial yam.
Tam sim no, muaj ob txoj hauv kev los xa cov teeb liab tswj cov cim hauv koob: ib qho yog los tswj hwm qhov greyscale ntawm txhua pixel ntawm lub scanning board, thiab lub scanning board decomposes brightness tus nqi ntawm txhua kab ntawm pixels ntawm lub thawv tswj (ie, pulse width modulation), Tom qab ntawd, lub teeb liab tig ntawm txhua kab ntawm LEDs raug xa mus rau cov LEDs sib xws hauv daim ntawv pulses (1 thaum teeb pom kev zoo, 0 thaum tsis teeb) rau cov LEDs sib xws hauv series los tswj. seb lawv lit. Txoj kev no siv cov khoom siv tsawg dua, tab sis cov ntaub ntawv xa mus hauv series yog loj, vim hais tias nyob rau hauv ib lub voj voog ntawm rov teeb pom kev zoo, txhua pixel xav tau 16 pulses nyob rau hauv 16- theem greyscale thiab 256- theem greyscale. 256 pulses, vim qhov kev txwv ntawm kev khiav hauj lwm zaus ntawm lub cuab yeej, feem ntau tsuas yog cov zaub LED tuaj yeem ua tiav 16- theem greyscale.
3. Cov ntsiab lus ntawm serial kis tau tus mob ntawm lub scanning board tsis yog lub switching teeb liab ntawm txhua LED tab sis ib tug 8- ntsis binary brightness nqi. Txhua LED muaj nws tus kheej PWM los tswj lub sijhawm teeb pom kev zoo. Nyob rau hauv txoj kev no, nyob rau hauv ib lub voj voog ntawm rov qab teeb pom kev zoo, txhua pixel tsuas xav tau 4 pulses nyob rau hauv 16- theem greyscale, thiab tsuas yog xav tau 8 pulses nyob rau hauv 256-theem grayscale, uas zoo heev txo cov serial kis zaus. Nrog rau txoj kev no ntawm decentralized tswj ntawm LED grayscale, 256- theem greyscale tswj tau yooj yim paub.
