Ib, Optical zog ntawm STN kua siv lead ua cov ntaub ntawv: lub hauv paus ntawm lub cev ntawm ntau -xim zaub
STN (Super Twisted Nematic) cov kua siv lead ua kua ua kom muaj zog ntawm cov electro-optic nyhuv nkhaus los ntawm kev ua kom cov molecular twist lub kaum sab xis ntawm 90℃ntawm TN hom mus rau 180℃-270 degree. Qhov kev hloov pauv no ua rau nws muaj cov yam ntxwv tseem ceeb hauv qab no:
Cov nyhuv Birefringence: Lub teeb teeb pom kev zoo yog decomposed rau hauv lub teeb zoo tib yam (o-}teeb) thiab lub teeb txawv txawv (e-teeb), thiab ob lub teeb ntawm lub teeb ua rau muaj qhov sib txawv ntawm qhov sib txawv hauv cov kua siv lead ua kua. Thaum dhau los ntawm tus ntsuas ntsuas, cuam tshuam tshwm sim, tsim cov xim tshwj xeeb.
Pre qaij lub kaum sab xis tswj: Cov molecules yuav tsum muaj lub kaum sab xis ua ntej ntawm 3℃-8℃ntawm kev taw qhia txheej interface kom ruaj ntseg cuam tshuam xim hauv lub xeev tsis muaj hluav taws xob.
Uniformity ntawm lub thawv thickness: Qhov sib txawv ntawm lub thawv thickness yuav tsum tau tswj tsis pub dhau 0.05 μ m kom tsis txhob sib npaug thickness ua rau mottled xim tom qab.
Cov yam ntxwv no ua rau cov kua dej STN nthuav tawm daj ntsuab lossis xiav grey tom qab thaum tsis muaj hluav taws xob siv, muab lub hauv paus rau lub cev rau ntau - xim zaub. Txawm li cas los xij, nws yuav tsum tau muab sau tseg tias cov xim ntawm cov ntshiab STN kua siv lead ua yuav txwv qhov ntau ntawm cov xim qhia, thiab kev them nyiaj yuav tsum tau ua los ntawm kev siv tshuab.
2, Txoj Kev Ua Haujlwm ntawm Ntau Xim Zaub: Kev Tshawb Fawb Txog Kev Tshawb Fawb los ntawm Pseudo xim rau tag nrho xim
1. Tej ntu ntu code zaub: monochrome thiab ob- xim schemes
Ib txwm siv STN ntu code LCDs siv cov tshuab luam ntawv luam ntawv los luam cov xim dub, liab, thiab lwm yam xim txheej ntawm cov iav substrates lossis cov yeeb yaj kiab polarizing, ua tiav ntau yam - xim zaub. Piv txwv li:
Cov zaub zoo: dub tom qab + dawb / daj font (TN / STN daj ntsuab zaj duab xis)
Cov zaub tsis zoo: dawb tom qab + dub font (ua tiav los ntawm lub teeb pom kev)
Ob xim ua ke: xim liab luam tawm lub plawv dhia qhov tseem ceeb, dub luam tawm lwm cov cim
Cov xim ntawm cov tswv yim no raug txwv los ntawm kev xaiv tus cwj mem, feem ntau tsuas yog txhawb nqa 2-5 xim, thiab pom muaj qhov tsis xws luag hauv tus number case thaum tsis siv.
2. Pseudo xim tso saib technology: ib qho kev sib tw hauv quantifying greyscale thiab xim
Los ntawm kev txhim kho kev tsav tsheb thiab cov ntaub ntawv siv lead ua kua, STN ntu code LCD tuaj yeem ua tiav cov qauv xim pseudo hauv qab no:
4-theem grayscale zaub: Los ntawm kev kho qhov voltage mem tes dav thiab tswj lub deflection lub kaum sab xis ntawm cov kua siv lead ua kua molecules, brightness thiab tsaus ntuj hloov yuav ua tau tiav. Piv txwv li, hauv kev saib xyuas kev kho mob, cov txiaj ntsig grey sib txawv yog siv los sawv cev rau ntau yam ntawm lub plawv dhia qhov tseem ceeb.
16 level grayscale display: using frame rate control (FRC) technology, enhancing the sense of hierarchy through grayscale mixing on the timeline. However, due to the response speed of STN (usually>100ms), siab -cov duab nrawm nrawm tuaj yeem ntsib kev ua dab.
256 xim / 4096 xim zaub: Hauv cov khoom siv kos xws li S3C2440A, 8-ntsis/pixel (R3G3B2) lossis 12 ntsis/pixel (R4G4B4) cov ntaub ntawv yog mapped rau ntau xim zaub los ntawm jitter algorithm (Dithering) thiab T colour lookup. Tab sis qhov tseeb xim saturation yog tsawg, teej tug mus rau qeb ntawm cuav xim.
3. Kev daws teeb meem xim puv xim: Kev tawg hauv CSTN thev naus laus zis
Xim STN (CSTN) faib txhua pixel rau hauv peb sub pixels ntawm liab, ntsuab, thiab xiav los ntawm overlaying RGB xim lim, thiab sib txuas STN lub greyscale tswj muaj peev xwm ua tiav 65536 xim zaub. Cov ntsiab lus tseem ceeb technical muaj xws li:
Subpixel kev npaj: Txais ib qho bar lossis zigzag kev npaj kom ua kom zoo dua cov xim sib xyaw.
Tsav channel nce: Los ntawm kev siv lub zog matrix tsav (AM-STN), qhov cuam tshuam ntawm passive matrix tau kov yeej, txhawb kev daws teeb meem siab dua (xws li 640 × 400).
Kev them nyiaj yug zaj duab xis: FSTN (Film + STN) thev naus laus zis tshem tawm cov xim keeb kwm yav dhau los ntawm STN los ntawm kev ntxiv cov yeeb yaj kiab them nyiaj, txhim kho qhov sib piv dub thiab dawb, thiab muab cov keeb kwm yav dhau los rau xim xim.
3, Technical bottlenecks thiab daws teeb meem: tus nqi ntawm ntau- xim zaub
1. Teb ceev txwv
Qhov nce ntawm lub kaum sab xis ntawm STN kua siv lead ua ua rau lub sij hawm teb ntev (tus nqi ntawm 200-300ms), uas tuaj yeem ua rau muaj kev ntxhov siab hauv cov duab dynamic. Cov tshuaj muaj xws li:
Cov lus teb ceev ceev cov ntaub ntawv siv lead ua kua: Tsim cov qauv ua kua siv lead ua nrog siab birefringence thiab qis viscosity, txo cov sij hawm teb rau hauv 50ms.
Overdrive technology: accelerates cov txheej txheem molecular deflection los ntawm kev siv lub pre qaij voltage.
2. Kev xav dependence
Lub kaum sab xis saib ntawm STN (feem ntau yog ± 40 degree) me dua li ntawm TFT-LCD (± 70 degree), thiab xim hloov yuav tshwm sim thaum saib obliquely. Kev txhim kho kev taw qhia:
Multi Domain Vertical Alignment (MVA) thev naus laus zis: Los ntawm kev npaj cov txheej txheem microstructures nyob rau hauv cov txheej txheem kev taw qhia, ntau qhov chaw saib xyuas tuaj yeem ua tiav.
Optical them nyiaj zaj duab xis: Ntxiv cov theem sib txawv them nyiaj zaj duab xis kom nthuav dav lub kaum sab xis saib.
3. Qhov sib txawv ntawm tus nqi thiab cov txiaj ntsig
STN cov kab ntau lawm yuav tsum muaj kev tswj xyuas meej xws li lub thawv tuab thiab lub kaum sab xis ua ntej, ua rau qis qis dua li TN hom. Tag nrho -xim CSTN module yuav tsum tau muab cov xim lim dej thiab cov yeeb yaj kiab them nyiaj, ua rau 30% -50% nce tus nqi piv rau monochrome STN. Kev lag luam teb tswv yim:
Modular tsim: Kev sib koom ua ke ntawm tus tsav tsheb IC, chav tsev teeb pom kev zoo, thiab LCD vaj huam sib luag los txo cov nqi hluav taws xob.
Txheej txheem optimization: Txais siv inkjet luam ntawv thev naus laus zis los hloov cov txheej txheem photolithography thiab txhim kho kev ua haujlwm ntawm cov xim lim ntau lawm.
4, Cov xwm txheej ntawm daim ntawv thov: Tus nqi realization ntawm ntau -xim zaub
Muaj cov twj paj nruag: Hauv lub vaj huam sib luag ua haujlwm ntawm CNC tshuab cov cuab yeej, cov ntaub ntawv ceeb toom tau tshwm sim hauv xim liab, kev ua haujlwm ib txwm muaj tshwm sim hauv ntsuab, thiab cov xwm txheej standby tshwm hauv daj.
Cov cuab yeej siv kho mob: Hauv cov cuab yeej kuaj mob ultrasound, B- cov duab ultrasound tau tso tawm hauv 16 qib greyscale, nrog xiav ciam teb qhia txog thaj chaw ua haujlwm.
Kev tswj cov khoom siv hauv tsev: Nyob rau hauv lub tub yees txias vaj huam sib luag, cov xim sib txawv yog siv los paub qhov txawv ntawm cov cua txias, kev txuag, thiab kev khov sai.
Automotive ntsuas vaj huam sib luag: Hauv kev hloov pauv digital ntawm cov cuab yeej siv tshuab ib txwm siv, xim coded LCD yog siv los hloov cov teeb qhia LED kom ua tiav cov xwm txheej zoo dua.
