Taw qhia
Thaum ntsuam xyuas LED zaub, feem ntau cov neeg yuav khoom tsom rau pixel pitch, ci ntsa iab, lossis refresh npaum li cas. Greyscale feem ntau hais hauv cov nplooj ntawv spec tab sis tsis tshua tau piav qhia qhov tob. Tsis tau greyscale kev ua tau zoo yog ib qho ntawm cov kev qhia ncaj qha tshaj plaws ntawm qhov ua tau zoo npaum li cas cov duab rov tsim cov duab nthuav dav, duab ntxoov ntxoo gradation, thiab xim hloov pauv - tshwj xeeb tshaj yog nyob rau hauv qhov tsaus ntuj lossis qis - thaj tsam luminance.
Kab lus no piav qhia txog qhov greyscale txhais li cas hauv cov ntsiab lus ntawm LED cov lus qhia, nws ua tiav li cas, thiab dab tsi cuam tshuam rau nws hauv kev xyaum.
1. Grayscale yog dab tsi?
Greyscale yog hais txog tus naj npawb ntawm cov luminance sib txawv ib qho zaub tuaj yeem tsim nruab nrab ntawm nws qhov ci tsawg kawg nkaus (tawm los yog ze -dub) thiab nws qhov ci siab tshaj plaws. Nws yog qhia raws li tus nqi me ntsis tob:
- 8-ntsis greyscale: 2⁸=256 qib ib xim channel
- 12-ntsis greyscale: 2¹²=4,096 qib ib xim channel
- 16-ntsis greyscale: 2¹⁶=65,536 qib ib xim channel
Nyob rau hauv ib qho RGB zaub, txhua ntawm peb cov xim raws (liab, ntsuab, xiav) muaj nws tus kheej grayscale ntau yam. A 16-ntsis-ib-channel system tuaj yeem sawv cev rau ntau dua 281 trillion xim ua ke.
Qhov siab me ntsis qhov tob tsis tsuas yog txhais tau tias "ci" - nws txhais tau tias cov zaub tuaj yeem hloov pauv hloov pauv ntawm cov kauj ruam luminance, uas txhais tau tias cov gradients smoother, cov xim ntawm cov tawv nqaij ntau dua, thiab pom kev nthuav dav hauv cov duab ntxoov ntxoo lossis cov ntsiab lus uas qis dua - ntsis - qhov tob zaub yuav ua raws li ib qho thaiv.
2. Yuav ua li cas Greyscale yog tsim nyob rau hauv LED zaub
Tsis zoo li LCD vaj huam sib luag, uas hloov lub teeb rov qab los ntawm cov kua siv lead ua kua, LED cov duab tsim lub teeb ncaj qha los ntawm LEDs lawv tus kheej. Greyscale tswj feem ntau los ntawm ob txoj hauv kev:
a) PWM (Pulse Width Modulation).LED yog switched rau thiab tawm ntawm high zaus. Qhov piv ntawm ntawm - sij hawm mus rau tawm - lub sij hawm nyob rau hauv txhua lub voj voog txiav txim siab qhov pom kev ci ntsa iab. Lub sijhawm ntev dua ntawm - lub sijhawm ua kom muaj zog dua; luv dua ntawm - lub sij hawm ua rau cov kauj ruam tsaus. Tag nrho cov naj npawb ntawm cov sij hawm sib cais nyob rau hauv ib lub voj voog txhais tau tias qhov tob ntawm qhov grey.
PWM-raws li greyscale yog txoj kev tseem ceeb vim nws ruaj khov nyob rau ntawm qhov kub thiab txias thiab tswj cov xim raug. Txawm li cas los xij, ntawm qhov chaw qis qis, qhov tsawg PWM zaus tuaj yeem ua rau pom flicker - uas yog vim li cas refresh npaum li cas thiab greyscale yog qhov cuam tshuam zoo sib xws.
b) Tam sim no Amplitude Modulation (CAM).Tsis yog hloov lub LED rau thiab tawm, txoj kev no kho qhov tam sim no ntws los ntawm LED. Tsawg tam sim no ua kom qis qis dua. CAM yog qee zaum siv ua ke nrog PWM (hybrid tswj) txhawm rau txuas ntxiv qhov ua tau zoo greyscale ntau ntawm cov luminance qis thaum txo qis flicker txaus ntshai.
3. Lub luag haujlwm ntawm tus tsav tsheb IC
Tus tsav tsheb IC yog cov khoom siv uas ua cov lus txib greyscale los ntawm daim npav txais. Nws qhov dav sau npe sab hauv ncaj qha txiav txim siab qhov siab tshaj plaws ua tiav greyscale qhov tob. Tus tsav tsheb IC nrog 16-ntsis PWM sau npe tuaj yeem tsim tau txog 65,536 qib grey; ib qho nrog 12-ntsis sau npe yog txwv rau 4,096.
Zoo- paub tsav tsheb ICs siv hauv siab- cov ntawv siv grey nplai suav nrog cov chips los ntawm Macroblock (MBI series), ICND, thiab SinoWealth - txhua qhov sib txawv ntawm kev lag luam sib txawv- tawm ntawm greyscale qhov tob, refresh npaum li cas, thiab lub zog ua haujlwm.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias greyscale specification tau tshaj tawm rau cov zaub yuav tsum xa mus rauqhov tseeb tso zis greyscale, tsis yog theoretical register dav. Qee cov tuam txhab lag luam hais txog qhov kev sau npe me ntsis qhov tob, uas tuaj yeem tshaj qhov pom ntawm qhov screen.
4. Greyscale thiab pom cov duab zoo
Kev sib raug zoo ntawm qib greyscale thiab pom cov duab zoo tsis yog linear - nws ua raws li cov logarithmic nkhaus raws li tib neeg kev pom kev pom (zoo ib yam li gamma nkhaus hauv cov khoom siv calibration).
Hauv kev xyaum, qhov sib txawv ntawm 8-ntsis thiab 12-ntsis greyscale pom meej hauv:
- Tsaus scene rendering: Duab ntxoov ntxoo uas tshwm li cov xim dub ntawm 8-ntsis zaub yuav qhia qhov tob thiab kev ntxhib los mos ntawm 12-ntsis lossis siab dua.
- Gradient smoothness: Ib qho kev hloov qeeb ntawm ib lub suab mus rau lwm qhov - xws li lub ntuj xiav fading mus rau lub qab ntug - yuav pom pom "banding" (cov kauj ruam sai) ntawm qis - ntsis- qhov tob qhia thiab pom du ntawm siab - ntsis - qhov tob.
- Qhia meej meej: Overexposed los yog ze rau - thaj tsam dawb yuav plam nthuav dav ntawm 8-ntsis qhia; siab dua me ntsis qhov tob khaws cov ntaub ntawv tonal hauv cov cheeb tsam ntawd.
Rau cov ntawv thov xws li kev tshaj tawm xov xwm studios, nplua - kos duab nthuav qhia, lossis siab - qhov chaw muag khoom kawg uas cov duab fidelity yog qhov tseem ceeb, qhov tsawg kawg nkaus ntawm 14-ntsis lossis 16-ntsis tso zis grayscale feem ntau pom zoo.
5. Tej yam uas tuaj yeem txwv qhov tiag -Kev ua tau zoo ntawm lub ntiaj teb Greyscale
Txawm tias thaum cov zaub muaj siab -ntsis- qhov tob hardware, ob peb yam tuaj yeem txo qis greyscale hauv cov xwm txheej tiag tiag:
- Tsawg ambient kub: LED rau pem hauv ntej voltage hloov nrog qhov kub thiab txias, uas tuaj yeem hloov lub luminance ntawm txhua kauj ruam grey yog tias tus tsav tsheb IC tsis them nyiaj.
- Kev laus thiab binning variation: Thaum lub sij hawm, tus kheej LEDs hloov nyob rau hauv brightness. Yog tias kev kho tsis raug siv (ntawm calibration), cov kauj ruam grayscale tuaj yeem ua tsis sib xws nyob rau saum npoo.
- Tsawg brightness ua haujlwm: Thaum txo qhov ci ntsa iab (piv txwv li, hmo ntuj hom rau sab nraum zoov), qhov qis qis qis qis qis qis dua thiab ua rau nyuaj rau qhov txawv, zoo txo qhov siv tau greyscale ntau.
- Cov kev txwv txoj hlua khi: Lub hauv paus teeb liab, kev kho vajtse, thiab video kis raws tu qauv tag nrho ua rau lawv tus kheej qhov tob me ntsis txwv. 16-ntsis zaub uas tau tsav los ntawm 8-ntsis video qhov yuav tsis tsim 16-ntsis tso zis.
6. Yuav Ua Li Cas Ntsuas Greyscale Thaum Xaiv Cov Zaub
Thaum sib piv cov duab, xav txog cov ntsiab lus no:
| Parameter | Nug dab tsi |
|---|---|
| Model IC tsav | PWM register me ntsis tob yog dab tsi? |
| Output greyscale qhov tob | Qhov no puas yog qhov tso zis tiag tiag lossis cov ntawv sau npe spec? |
| Kev them nyiaj yug Calibration | Cov zaub puas txhawb nqa rau -pixel luminance kho? |
| Tsawg- brightness kev ua tau zoo | Dab tsi yog qhov ci ntsa iab tsawg kawg nkaus, thiab pes tsawg qib grayscale nyob ntawm qhov chaw? |
Thov kom muaj kev ua neej nyob nrog tus qauv ntsuas qhov ntsuas grey (qhov kev sib tw du ntawm dub mus rau dawb) yog txoj hauv kev ntseeg siab tshaj plaws los ntsuas qhov tseeb -kev ua haujlwm hauv ntiaj teb ua ntej yuav khoom.
Xaus
Greyscale qhov tob yog qhov ntsuas qhov tseem ceeb uas txiav txim siab yuav ua li cas rau kev ntseeg siab ntawm LED zaub tuaj yeem tsim tawm tag nrho cov tonal ntau ntawm cov duab. Nws ua haujlwm ua ke nrog refresh npaum li cas, xim gamut, thiab qhov sib piv piv los txheeb xyuas qhov pom kev zoo ntawm cov zaub. Nkag siab txog cov txheej txheem thev naus laus zis tom qab greyscale - thiab paub txog dab tsi los txheeb xyuas thaum kuaj cov khoom lag luam - pab cov neeg yuav khoom txiav txim siab paub ntau ntxiv raws li lawv cov kev thov tshwj xeeb.