Nrog rau txoj kev loj hlob thiab kev siv ntawm sab hauv LED zaub, nws tuaj yeem pom tias cov zaub LED tau siv ntau dua thiab siv dav hauv qhov chaw hais kom ua, chaw saib xyuas thiab txawm tias studio.Txawm li cas los xij, los ntawm tag nrho cov kev ua tau zoo ntawm LED zaub system, cov lus qhia no puas tuaj yeem ua tau raws li cov neeg siv khoom xav tau?Puas yog cov duab tso rau ntawm cov duab LED no zoo ib yam li tib neeg lub zeem muag?Cov LED no puas tuaj yeem tiv thaiv lub koob yees duab sib txawv?Cov no yog cov teeb meem uas yuav tsum tau txiav txim siab rau LED zaub.Txawm li cas los xij, grey nplai yog tus yuam sij los txhim kho qhov tsis tshua muaj teeb pom kev zoo ntawm LED cov duab.Tam sim no, cov neeg siv khoom xav tau ntau dua thiab siab dua rau cov duab zoo ntawm lub vijtsam zaub, thiab nws tseem ceeb dua thiab ntau dua rau LED zaub screen kom ua tiav cov txiaj ntsig ntawm "tsis tshua muaj siab, siab grey".Yog li kuv yuav ua ib qho kev ntsuam xyuas tshwj xeeb los ntawm qhov kev xav ntawm qib grey uas cuam tshuam rau cov nyhuv LED.
- Dab tsi yog grey scale?
- Qhov cuam tshuam ntawm greyscale ntawm qhov screen yog dab tsi?
- Muaj ob txoj hauv kev los tswj cov qib grey ntawm coj zaub.
1.Dab tsi yog grey scale?
Cov qib grey ntawm LED zaub tuaj yeem hu ua LED ci ci.Cov qib grey ntawm LED zaub yog hais txog qib ci ci uas tuaj yeem paub qhov txawv ntawm qhov tsaus ntuj tshaj plaws mus rau qhov ci tshaj plaws hauv tib lub ci ci ntawm LED zaub.Qhov tseeb, qib grey kuj tseem hu ua halftone, uas yog siv los hloov cov duab cov ntaub ntawv rau daim npav tswj.Thawj qib grey ntawm LED zaub tuaj yeem yog 16, 32, 64. Nrog rau kev nce qib ntawm kev siv tshuab, 256 yog tam sim no siv los ntawm cov tuam txhab tseem ceeb.Cov qib grey ntawm LED zaub screen tau ua tiav rau hauv 16, 32, 64 thiab 256 qib ntawm cov ntaub ntawv pixels los ntawm kev ua matrix, kom cov duab xa tawm kom pom tseeb.Txawm hais tias nws yog monochrome, ob-xim lossis xim puv npo, los tso saib cov duab lossis cov yeeb yaj kiab, nws yog qhov yuav tsum tau kho cov qib grey ntawm txhua qhov LED uas yog qhov pixel ntawm cov khoom.Qhov zoo ntawm kev hloov kho yog qhov peb feem ntau hu ua qib grey.
Ntawm no yog ib daim ntawv teev kom meej meej.Piv txwv li, yog cov liab ntshiab yog 255 thiab lub brightest liab yog 0, muaj 256 xim.Yog tias koj xav tso cov duab nrog cov khoom qub, koj puas yuav tsum siv 256 xim kis tau tus mob.Piv txwv li, yog tias tus nqi xim ntawm ib lub thav duab hauv video yog liab 69, thiab lub vijtsam LED tsuas muaj 64 qib grey, cov xim hauv cov yeeb yaj kiab xim tsis tuaj yeem tso tawm ib txwm.Cov txiaj ntsig kawg tuaj yeem xav txog, thiab nws yog qhov tseeb tias daim duab zoo nkauj thiab zoo nkauj.
Tswv yim: Tam sim no, qhov siab tshaj plaws grey qib ntawm LED zaub screen yog 256, tseem hu ua 65536, uas tsis tuaj yeem hais tsis yog, vim hais tias txhua lub teeb hlaws ntawm tag nrho cov xim LED zaub screen yog tsim los ntawm RGB peb xim, ib xim muaj 256 grey. theem, thiab tag nrho tus lej yog 65536.2.
2.Qhov cuam tshuam ntawm greyscale ntawm qhov screen yog dab tsi?
Lub grey theem ntawm LED hluav taws xob loj screen yog hais txog kev hloov ntawm cov xim sib txawv ntawm cov xim tsaus nti thiab ncov xim xim.Feem ntau, cov nplai grey ntawm cov tsoos high-txhais LED zaub yog nyob nruab nrab ntawm 14-ntsis thiab 16-ntsis, nrog ntau dua 16384 xim qib, uas tuaj yeem pom cov ntsiab lus hloov pauv ntawm cov duab xim.Yog tias qib grey tsis txaus, cov xim qib yuav tsis txaus lossis cov xim gradient yuav tsis du txaus, thiab xim ntawm cov duab ua si yuav tsis pom tag nrho.Rau qhov loj, cov nyhuv tso saib ntawm LED zaub screen raug txo.Yog tias daim duab thaij nrog 1/500s shutter muaj qhov pom tseeb xim blocks, nws qhia tau tias qib grey ntawm lub vijtsam qis.Yog tias koj siv lub shutter ceev dua, xws li 1/1000s lossis 1/2000s, koj yuav pom cov xim pom tseeb dua, uas yuav cuam tshuam rau tag nrho cov duab zoo nkauj.
3.Muaj ob txoj hauv kev los tswj cov qib grey ntawm coj zaub.
Ib qho yog hloov cov dej ntws tam sim no, thiab lwm qhov yog pulse width modulation.
1. Hloov tam sim no ntws los ntawm LED.Feem ntau, cov raj LED tso cai rau kev ua haujlwm tsis tu ncua ntawm li 20 mA.Tsuas yog rau qhov saturation ntawm liab LEDs, lub grey scale ntawm lwm LEDs yog feem ntau proportional rau tam sim no ntws los ntawm lawv;
2. Lwm txoj hauv kev yog siv qhov pom kev inertia ntawm tib neeg lub qhov muag kom paub txog kev tswj hwm grey los ntawm kev siv cov txheej txheem pulse width modulation, uas yog, ncua sij hawm hloov lub teeb mem tes dav (piv txwv li lub voj voog lub luag haujlwm).Ntev npaum li lub voj voog ntawm kev rov qab teeb pom kev zoo yog luv luv (piv txwv li tus nqi refresh yog siab txaus), tib neeg lub qhov muag tsis tuaj yeem hnov lub teeb emitting pixels co.Vim tias PWM yog qhov tsim nyog rau kev tswj hwm digital, yuav luag txhua cov ntxaij vab tshaus LED siv PWM los tswj cov qib grey niaj hnub no thaum microcomputers tau siv dav los muab cov ntsiab lus ntawm LED.LED tswj system feem ntau yog tsim los ntawm lub ntsiab tswj lub thawv, scanning board thiab tso saib thiab tswj ntaus ntawv.
Lub thawv tswj lub ntsiab tau txais cov ntaub ntawv ci ntsa iab ntawm txhua xim ntawm lub vijtsam pixel los ntawm daim npav tso saib ntawm lub khoos phis tawj, thiab tom qab ntawd xa rov qab 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 screen, thiab cov zaub thiab tswj cov teeb liab ntawm LEDs ntawm txhua kab (kem) yog kis nyob rau hauv ib tug serial yam.
Tam sim no, muaj ob txoj hauv kev ntawm serial kis tau tus mob ntawm cov zaub tswj cov cim:
1. Ib qho yog los tswj qhov nruab nrab ntawm qib grey ntawm txhua pixel taw tes ntawm lub rooj tsavxwm scanning.Lub scanning board decomposes tus nqi grey qib ntawm txhua kab ntawm pixels los ntawm lub thawv tswj (piv txwv li, mem tes dav modulation), thiab tom qab ntawd xa cov teeb liab qhib ntawm txhua kab ntawm LED mus rau qhov sib thooj LED hauv daim ntawv mem tes (1 yog tias nws yog lit, 0 yog nws tsis yog lit) nyob rau hauv kab serial hom los tswj seb nws yog lit.Txoj kev no siv cov khoom siv tsawg dua, tab sis cov ntaub ntawv xa mus serially yog loj.Vim hais tias nyob rau hauv ib lub voj voog ntawm rov teeb pom kev zoo, txhua pixel xav tau 16 pulses ntawm 16 qib ntawm grey thiab 256 pulses ntawm 256 qib grey.Vim tias cov cuab yeej ua haujlwm ntau zaus txwv, cov ntxaij vab tshaus LED tsuas tuaj yeem ua tiav 16 qib grey.
2.Ib qho yog pulse width modulation.Lub scanning board serial kis cov ntsiab lus tsis yog lub teeb liab hloov ntawm txhua LED, tab sis tus nqi 8-ntsis binary grey.Txhua LED muaj nws tus kheej pulse dav modulator 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 yog xav tau 4 pulses ntawm 16 qib ntawm grey thiab 8 pulses ntawm 256 theem ntawm grey, zoo heev txo cov zaus kis tau tus mob.Nrog rau txoj kev no ntawm kev tswj hwm kev tswj hwm ntawm LED greyscale, 256 qib greyscale tswj tau yooj yim pom tau.
Muaj ntau ntau cov ntxaij vab tshaus hauv MPLED chav uas tau mus txog qib grey ntawm 16 ntsis, xws li ST Pro, WS, WA, thiab lwm yam, uas tuaj yeem ua kom pom cov xim qub ntawm cov duab thiab cov yeeb yaj kiab.Nyob rau hauv cov ntaub ntawv ntawm high-speed photography, cov xim saum toj no tsis tuaj yeem tshwm sim.Cov ntxaij vab tshaus yog ua los ntawm cov khoom siv qib siab, uas yog cov khoom siv high-end hauv kev lag luam.Peb muab ntau yam pixel qhov sib txawv me me xaiv, nrog rau ntau yam kev daws teeb meem.Yog tias koj xav yuav ib pawg ntawm cov ntxaij vab tshaus me me tsis ntev los no, thov hu rau peb, tus thawj coj ntawm kev pabcuam ib-nres-MPLED.
Post lub sij hawm: Nov-15-2022
