TN hom kua siv lead ua kua zaub kuj hu ua" twisted nematic (TN) zaub", nws yog hom khoom siv ua kua siv lead ua ntau tshaj. Cov ntxaij vab tshaus LCD siv nyob rau hauv qee cov watches, cov ntsuas hluav taws xob, lub moos hluav taws xob, thiab lub tshuab xam zauv feem ntau yog cov khoom siv TN hom. Feem ntau, feem ntau ntawm cov kua siv lead ua kua siv tau siv rau cov cwj mem-seg digital zaub yog TN-hom khoom siv. Yog li ntawd, hom kua siv lead ua kua no yuav tsum yog cov kua siv lead ua kua zoo tshaj plaws.
Lub hauv paus ntsiab lus ntawm TN-hom kua siv lead ua kua zaub yog: lithographically etch ib yam pob tshab hluav taws xob phaj qauv ntawm cov iav coated nrog ITO pob tshab conductive txheej, thiab ces sandwich pem hauv ntej thiab nraub qaum ob iav substrates nrog pob tshab conductive electrode qauv. Tuav ib txheej ntawm nematic kua siv lead ua cov khoom siv nrog zoo dielectric anisotropy, thiab tom qab ntawd muab khi ib ncig ntawm nws los tsim ib lub thawv kua siv lead ua tiaj tiaj nrog lub thickness ntawm tsuas yog ob peb microns. Vim hais tias nws yog coated nrog ib tug alignment txheej nyob rau hauv lub puab nto ntawm lub iav thiab undergoes ib qho kev kho kom haumxeeb, cov kua siv lead ua kua molecules nyob rau hauv lub cell yog aligned parallel mus rau saum npoo ntawm iav. Txawm li cas los xij, vim hais tias cov kev taw qhia ua cov txheej txheem ntawm cov txheej txheej saum npoo ntawm ob daim iav yog perpendicular rau ib leeg, cov kua siv lead ua kua molecules yog twisted ntawm 90 degrees ntawm ob daim iav. Qhov no yog lub hauv paus chiv keeb ntawm lub npe ntawm twisted nematic kua siv lead ua kua screen. Daim duab 1 yog TN Daim duab 2 qhia txog schematic daim duab ntawm cov qauv ntawm LCD npo.
Txij li thaum lub sij hawm twisted ntsia hlau ntawm cov kua siv lead ua kua molecules nyob rau hauv lub cell ntawm TN-hom kua siv lead ua kua zaub ntaus ntawv yog ntau dua li lub wavelength ntawm pom lub teeb, thaum cov kua siv lead ua kua molecules nyob rau sab ntawm lub iav nto yog raws li nyob rau hauv tib los yog orthogonal linearly polarized lub teeb teeb meem Tom qab ntawd, cov kev taw qhia ntawm nws lub teeb polarized yuav twisted los ntawm 90 ° tom qab dhau los ntawm tag nrho cov kua siv lead ua txheej thiab tom qab ntawd tawm ntawm sab nraud. Yog li ntawd, cov kua siv lead ua kua cell no muaj kev ua haujlwm ntawm kev tiv thaiv lub teeb ntawm cov polarizers thaum uas tig mus, thiab qhov chaw nyob nruab nrab ntawm cov polarizers orthogonal. Lub teeb tuaj yeem tiv thaiv ntawm tus hla polarizers, thiab lub teeb tuaj yeem kis tau los ntawm cov polarizers orthogonal.
Yog tias qhov hluav taws xob tau siv rau lub thawv ua kua siv lead ua kua thiab ncav cuag tus nqi ntawm lub sijhawm no, qhov ntev axis ntawm cov kua siv lead ua kua molecules yuav pib qaij raws cov kev taw qhia ntawm hluav taws xob teb. Thaum qhov hluav taws xob nce mus txog ob zaug ntawm qhov pib voltage, tshwj tsis yog cov kua siv lead ua kua molecules ntawm lub electrode nto, Tag nrho cov kua siv lead ua kua molecules nyob rau hauv cov kua siv lead ua kua cell thiab nruab nrab ntawm ob lub electrodes yuav reranged raws cov kev taw qhia ntawm hluav taws xob teb. Lub sijhawm no, kev ua haujlwm ntawm 90 ° kev sib hloov kho qhov muag yuav ploj mus, thiab kev ua haujlwm ntawm kev sib hloov kho qhov muag ntawm lub orthogonal polarizers ploj. Ua rau lub cuab yeej tsis tuaj yeem kis lub teeb. Qhov chaw nruab nrab ntawm cov polarizers thaum uas tig mus poob nws qhov kev sib hloov kho qhov muag, kom lub cuab yeej tsis tuaj yeem thaiv lub teeb.
Yog li ntawd, yog tias peb tso cov kua siv lead ua lub thawv ntawm orthogonal lossis parallel polarizers, peb tuaj yeem siv txoj hauv kev ua kom lub zog ua kua siv lead ua lub thawv kom lub teeb hloov nws txoj kev sib kis-shielding lub xeev, kom paub txog nws cov zaub. Feem ntau, thaum peb saib ntawm lub vijtsam LCD, cov cim dub tshwm faintly, tsis yog vim cov kua siv lead ua kua hloov xim, tab sis vim tias cov kua siv lead ua kua tso cai rau lub teeb hla los yog nqus tau.
