Ib, Lub ntsiab lus tseem ceeb ntawm ntu code screen backlight system
Ntu code screen nws tus kheej belongs rau lub teeb passive-emitting li, thiab nws cov ntsiab lus tso cai rau cov kev hloov pauv ntawm cov kua siv lead ua kua molecules nyob rau hauv qhov kev txiav txim ntawm ib qho hluav taws xob teb, ua tiav kev xaiv kis tau tus mob ntawm lub teeb los ntawm polarizing films. Vim lub fact tias cov ntaub ntawv siv lead ua kua lawv tus kheej tsis emit lub teeb, lawv yuav tsum cia siab rau sab nraud lub teeb (xws li backlight systems) kom ua tiav cov duab pom. Backlight systems feem ntau yog tsim los ntawm cov khoom xws li LED qhov chaw teeb pom kev zoo, daim phiaj qhia teeb pom kev zoo, cov yeeb yaj kiab pom, thiab cov yeeb yaj kiab diffusion. Lawv lub zog siv nyiaj rau 60% -80% ntawm tag nrho cov kev siv hluav taws xob ntawm segmented code cov ntxaij vab tshaus, ua rau lawv cov khoom tseem ceeb ntawm kev txuag hluav taws xob.
Los ntawm kev pom kev tsim qauv, muaj ob hom kev tswj hwm lub teeb:
Ntiaj teb no tswj hom: Illuminates tag nrho cov zaub cheeb tsam los ntawm ib tug tib backlight qhov chaw, haum rau yooj yim digital zaub scenes xws li hluav taws xob ntsuas thiab ntsuas kub.
Kev faib tawm hom: siv ntau lub teeb ntawm LEDs kom ua tiav kev hloov pauv ntawm lub teeb pom kev hauv cheeb tsam, feem ntau yog siv hauv cov duab nraaj nyuaj xws li cov ntsuas ntsuas ntse thiab cov ntsuas kev kho mob.
2, Kev tawg ntawm lub zog-txuag thev naus laus zis ntawm qib kho vajtse
1. Kev tsim kho tshiab hauv cov khoom siv teeb pom kev zoo
Industry leading companies such as Yangrun Electronics have jointly developed ultra-high resistivity (ρ>10 ¹Ω· cm) liquid crystal formulas with upstream material suppliers, reducing the leakage current of liquid crystal cells to below 0.1 μ A. Combined with high-efficiency (>20 LM/W) LED light sources and high reflectivity (>98%) cov ntawv qhia lub teeb, lub teeb pom kev siv hluav taws xob tau txo los ntawm 40% thaum tuav cov zaub ci. Piv txwv li, nyob rau hauv ib txoj haujlwm ntse dej ntsuas, ib qho kev hloov kho backlight module yog siv los ua kom tiav 10-xyoo roj teeb lub neej raws li kev ua haujlwm tam sim no ntawm 5 μ A.
2. Kev ua kom zoo ntawm Tsav Circuit Court
Qhov kev xaiv ntawm tus tsav tsheb IC ncaj qha cuam tshuam rau lub teeb pom kev zoo. Cov kev daws teeb meem tseem ceeb suav nrog:
Tsis tshua muaj hluav taws xob tam sim no nti: xws li HT1621 series tsav IC, nrog rau qhov tam sim no zoo li qis li 0.5 μ A, txhawb nqa 1/2 txoj kev tsav tsheb tsis zoo, tuaj yeem txo qis kev siv hluav taws xob siv hluav taws xob los ntawm 30%.
Intelligent dimming circuits: ua tiav 0-100% brightness hloov los ntawm PWM (mulse width modulation) technology, thiab koom tes nrog photosensitive sensors kom ua tau raws li kev tswj ntawm ambient lub teeb. Cov ntaub ntawv kho mob qhia tau hais tias cov thev naus laus zis no hloov kho lub teeb pom kev siv hluav taws xob nrog ib puag ncig ci ntsa iab, ua tiav kev txuag hluav taws xob ntawm 55%.
3. Kev tsim kho tshiab tsim qauv
Lub modular backlight system tsim los ntawm Ningbo Xuda Electronics ua tiav lub zog txuag los ntawm cov qauv hauv qab no:
Layered light guide structure: Muab lub teeb ci LED tso rau ntawm ntug ntawm lub teeb qhia phaj thiab siv lub hauv paus ntsiab lus ntawm tag nrho cov kev xav kom ua tiav lub teeb pom kev zoo thiab txo lub teeb poob.
Kev tswj kev faib tawm ntse: Faib thaj chaw tso saib rau hauv 4 × 4 matrix, ntawm nws tus kheej tswj lub teeb rov qab ntawm txhua qhov kev faib tawm los ntawm MCU, thiab tua lub teeb rov qab ntawm qhov tsis tseem ceeb thaum pom cov ntsiab lus zoo li qub.
3, Kev txuag hluav taws xob ntawm Kev Tswj Xyuas Software
1. System theem tswj fais fab
Hauv embedded Linux systems, backlight tswj tuaj yeem ua tiav los ntawm peb txoj hauv kev:
Sysfs interface tswj: ncaj qha sau rau / sys / chav kawm / pob teeb / packlight0 / cov ntaub ntawv ci ntsa iab (0 raug kaw), tsim nyog rau tus qauv tsav tsheb.
Framebuffer ioctl hu: tswj los ntawm FBIOBLANK hais kom ua (nrog parameter 1 tua), haum rau kev cai tshuab yam tsis muaj kev txhawb nqa sysfs.
GPIO tswj ncaj qha: Yog tias lub teeb rov qab txuas nrog GPIO tus pin, cov lus teb millisecond tuaj yeem ua tiav los ntawm / sys / class / gpio directory operations.
Cov ntaub ntawv xeem tiag tiag ntawm qee qhov kev tswj hwm kev lag luam qhia tau hais tias tom qab siv lub tswv yim tswj lub teeb pom kev zoo:
Thaum tso tawm cov ntsiab lus zoo li qub: refresh tus nqi txo los ntawm 60Hz mus rau 5Hz, kev siv hluav taws xob txo los ntawm 72%
Nyob rau hauv hmo ntuj hom: backlight brightness poob mus rau 10%, kev siv hluav taws xob txo los ntawm 89%
Thaum lub teeb rov qab raug kaw tag nrho: tag nrho lub zog siv ntawm lub tshuab txo los ntawm 2.2mA txog 0.57mA
2. Daim ntawv thov txheej zog -txuag algorithm
Qhov "scenario paub txog lub zog-txuag algorithm" tsim los ntawm cov tuam txhab tsim khoom ntse tuaj yeem ua tiav:
Khawm ua rau lub teeb pom kev zoo: tsuas yog teeb lub teeb rov qab thaum ua haujlwm los ntawm tus neeg siv, thiab cia li kaw tom qab 3 vib nas this
Lub teeb ceeb toom txawv txav: tsuas yog teeb lub teeb liab qab thaum lub cuab yeej tsis ua haujlwm, thiab tseem nyob hauv lub xeev qub
Sijhawm pw tsaug zog zoo: Nkag mus rau kev pw tsaug zog sib sib zog nqus thaum lub sijhawm tsis ua haujlwm raws li cov qauv siv cuab yeej siv
Tom qab siv cov algorithm no rau qee qhov kev ntsuas ntse, lub teeb pom kev ntawm lub sijhawm tau luv luv los ntawm qhov nruab nrab ntawm 8 teev ib hnub mus rau 15 feeb, thiab kev txuag hluav taws xob txhua xyoo mus txog 1.2 kWh.
4, Kev lag luam daim ntawv thov rooj plaub thiab cov ntaub ntawv siv tau
1. Cov khoom siv kho mob teb
Ib lub hom phiaj ntawm kev saib xyuas siv cov cuab yeej siv hluav taws xob faib hluav taws xob, faib thaj chaw tso rau hauv peb txoj kev ywj pheej: lub plawv dhia, ntshav oxygen, thiab ntshav siab. Thaum lub sijhawm saib xyuas kev ruaj ntseg, tsuas yog lub teeb rov qab ntawm qhov kev faib tawm tam sim no tau khaws cia, thiab ntsuas lub zog siv tau raug txo los ntawm 12mA mus rau 3.5mA, thiab lub roj teeb lub neej txuas ntxiv mus rau 72 teev.
2. Hauv thaj chaw ntawm cov tsev ntse
Ib qho cuab yeej ntse ntsuas kub ua tiav:
Strong light environment (>1000lux): Backlight brightness ntawm 100%
Nruab nrab teeb pom kev zoo (300-1000lux): Backlight brightness ntawm 50%
Ib puag ncig lub teeb qis (<300lux): Backlight brightness of 20%
Hmo ntuj hom (<50lux): Backlight off
Qhov kev daws teeb meem no txo cov khoom siv hluav taws xob txhua hnub ntawm 0.8Wh rau 0.2Wh, ua tau raws li EU ERP cov qauv kev siv hluav taws xob.
3. Kev ntsuas kev lag luam
Ib lub tshuab xa hluav taws xob siab txais yuav lub tswv yim ntawm "dynamic refresh + backlight control":
Kev saib xyuas ib txwm: Rov kho cov ntaub ntawv txhua 5 vib nas this, rov qab teeb tawm
Cov ntaub ntawv hloov pauv: Thaum kuaj pom qhov hloov pauv siab, tam sim ntawd rov ua dua thiab teeb lub backlight (rau 2 vib nas this)
Tswb xwm txheej: Nruam lub teeb liab qab kom txog thaum qhov kev ua txhaum raug daws
Kev ntsuam xyuas tau pom tias qhov kev daws teeb meem no txuas ntxiv lub cuab yeej lub roj teeb ntawm 3 xyoos mus rau 5 xyoos thiab txo cov nqi hloov roj teeb los ntawm 60%.
