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Ua hauj lwm txoj cai ntawm ntau hom kev siv lead ua kua

Jul 03, 2018

Ua hauj lwm txoj cai ntawm ntau hom kev siv lead ua kua


1. Cov kua siv lead ua kua yog lub cev lub cev ua kua dej ua kua. Tsis muaj teeb meem li cas cov kua siv lead ua kua hauj lwm raws li cov hauv paus ntsiab lus nram qab no, cov kua siv lead ua kua molecules tau hloov los ntawm ib qho kev pib ua ntej mus rau lwm yam permutations los ntawm kev raug hluav taws xob los yog cua sov thiab lwm cov chaw sab nraud. Nrog cov kev hloov hauv kev kho ntawm cov kua siv lead ua kua molecules, cov khoom siv kho qhov muag (cov khoom sib npaug ntawm tus kheej) ntawm cov kua siv lead ua kua molecules tshwm sim. Qhov hloov yuav tsum tau hloov mus rau qhov kev hloov pauv ntawm lub teeb thiab ntxoov ntxoo.
2, tam sim no tus npau npaim TFT npav matrix kua crystal kua siv lub TN (Twisted Nematic) hom tas li dawb hom (Feem ntau Dawb). Qhov tseem ceeb tshaj plaws ntawm TN hom yog qhov chaw ntawm cov kua siv lead ua kua tau raws li cov kev mob Morgan (uas yog piav raws li: qhov khoom ntawm cov cua ntawm cov kua siv lead ua kua thiab cov khoom ntawm lub anisotropy ntawm nws txoj kev ntsuas qis qis ntau dua li ntawm ib nrab ntawm qhov teeb meem ntawm qhov teeb meem, uas yog, qhov kev txiav txim siab ntawm [1] / 2), yog li ntawd txoj kev sib hloov ntawm lub dav hlau tawg ntawm lub teeb yog ywj siab ntawm lub wavelength thaum kua crystal kis los ntawm cov kua siv lead ua kua. Nws tau hais tias thaum lub Morgan mob txaus siab, lub kaum sab xis ntawm qhov kev sib hloov ua los ntawm ntau lub wavelengths ntawm qhov teeb meem lub teeb uas dhau los ntawm cov kua siv lead ua kua yog tib yam. Cov kua siv lead ua kua puv npo puv npo (zoo nematic) kua dej ua kua, cov kua siv lead ua kua molecules yog teem rau ntawm qhov chaw, thiab cov axis ntev ntev yog sib zog ntawm qhov nruab nrab thiab qis iav substrates, thiab sab saud thiab sab nraud tuaj orthogonal tsim.
Txoj haujlwm ua haujlwm ntawm TN lub thawv muaj nyob hauv daim duab 1.1 hauv qab no: nyob rau hauv lub xeev uas tsis sib haum, txoj kev coj ntawm lub ncov ntawm lub ncov qis yog sib luag rau cov kua tshuaj ua kua (molecule molecule) rau ntawm qhov qis ntawm substrate vim yog lub xeev uas raug kaw, thiab lub polarizer tau los ntawm lub polarizer yuav tig synchronously li cov kua siv lead ua kua molecule distorted los ntawm cov kua siv lead ua kua (qhov no hu ua qhov hu ua TN). Kev sib hloov ua kom zoo, thaum lub dav substrate nce mus txog lub substrate, txoj kev sib hloov ntawm lub npoo polarization nce mus txog 90, thiab qhov kev coj ntawm txoj kev sib nkag siab yuav ua rau txoj kev coj ntawm lub tshuab coj kom pom, thiaj li tias txoj kab kev tuaj yeem tuaj yeem mus los ntawm lub ntes thiab qhia lub ci zaub (raws li daim duab dawb yog tsis muaj hluav taws xob, nws yog hu ua "txoj kev dawb"). Thaum peb thov ib qho hluav taws xob ntau dua li tus nqi pib ntawm Vth mus rau cov kua siv lead ua kua, cov txheej txheem dej ntawm lub npiv nematic kua kua roj yuav raug muab pov tseg thiab ua rau hauv kev ua haujlwm ntawm cov hluav taws xob. Thaum qhov voltage hov nce 2Vth, tag nrho lwm cov kua siv lead ua kua molecules sab nraum lub npoo ntawm cov substrate thiab cov npoo ntawm cov substrate muaj rearranged raws cov kev taw qhia ntawm lub teb hluav taws xob, lub sij hawm no, 90 ntawm lub TN thawv Cov khoom tig ntawm cov kua Crystal cell disappeared, thiab kua siv kua qaub cell ntawm cov orthogonal polarizers poob nws lub teeb transmittance.
3. Tam sim no, nws muaj hom STN, uas siv cov khoom siv ntawm cov kua siv lead ua kua (thiab TN hom sau saum toj no siv cov khoom siv ntawm qhov tshwj xeeb uas tau tsim ua kua dej ua kua molecular txheej). Vim tias txoj hauv kev, qhov xim xim tsis zoo (muaj kev cuam tshuam xim, uas yog, muaj peev xim tsis muaj peev xwm zoo tsis zoo), yog li nws tsuas yog siv rau cov khoom qis kawg, xws li lub xov tooj txawb, PDA thiab lwm yam.
Qhov txawv ntawm STN hom kua siv lead ua kua thiab TN hom tsuas yog cov ntsiab lus nram qab no: (1) txoj kev coj ntawm lub polarizer thiab qhov ntev ntawm txoj kab ntawm cov kua siv lead ua kua qis ntawm sab sab substrate (piv txwv li cov kev coj ntawm qhov chaw seem ntawm qhov muag) tsis yog thaum uas tig mus, tiam sis 30 lub kaum pob zeb. Nyob rau hauv txoj kev no, lub polarizer tau los ntawm lub ncov qaumteb (polarizer) yuav muaj qhov sib xyaw ua kua dej (2), thiab qhov ntev ntawm txoj kab ntawm cov kua siv lead ua kua qaub rau hauv qaum thiab sab qis substrates yog tsis tu ncua los ntawm 270, thaum TN box yog 90 .
Lub ntsiab cai ntawm STN hom yog raws li nram no: thaum lub hwj chim tsis ntxiv, cov kua siv lead ua kua molecules cov nplaum thiab txheej txheem (qhov ntev ntawm txoj kab ntawm cov kua siv lead ua kua qaub rau hauv qaum thiab sab substrates tab tom ua tas li 270), vim hais tias txoj kev coj ntawm cov kua siv lead ua kua thiab cov polarizer tsis yog mus tib seem, tiam sis 30 lub polarization ntawm sab substrate, ces qhov sib pauv polarised tau los ntawm lub ncov tub rog yuav xa tuaj thaum cov kua siv lead ua kua rau hauv cov kua siv lead ua kua. Birefringence tshwm sim, thiab ob qhov hluav taws xob vector lub zog ntawm cov teeb ci yog cov resynthesized ntawm lub phaj siab ua elliptically polarized lub teeb, thiab nws thiaj li qee yam ntawm lub teeb yog emitted los ntawm lub polarizer. Thaum lub hwj huam tau ntxiv, txoj kev sib tw ntawm cov kua siv lead ua kua molecules yog ua kom tawg thiab npaj rau hauv ib lub dav hlau ntsug, thiab cov phiaj xwm polarizing teem rau hauv seem ntu tuaj yeem thaiv qhov teeb pom kev ntawm lub teeb thiab tau lub xeev tsaus nti.
4. Nyob rau saum toj ob hom, qhov loj dua qhov kev siv qhov hluav taws xob (voltage applied), qhov loj dua qhov tob ntawm lub kua siv lead ua kua molecules (qhov ze ntawm lub dav hlau ntsug), qhov ntau dua qhov siv ntawm qhov sib txuas sib txuas; qhov me me qhov khoom siv qhov hluav taws xob, cov kua qaub me me ua kua dej (ze rau ntawm qhov chaw), lub zog me me coj los sib txuas. Qhov ntawd yog hais tias, qhov ntsuas ntawm grey tuaj yeem ua tiav los ntawm kev tswj qhov siab ntawm qhov siv cov lus thov.
5. Lub hom phiaj ntawm cov yeeb yam xim:
Cov xim ntawm LCD yog pom tau los ntawm xim lim zaj duab xis. Tus txheej txheem ntawm kev tsim xim lim zaj duab xis yog muaj nyob hauv Daim Qauv 2.7 hauv qab no:

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Ua ke ntawm cov qauv ntawm cov kua siv lead ua kua tau pom hauv qab no, uas yog hais, R, G, B peb cov xim xim ntawm cov xim lim xim yog teem rau hauv ib qho qauv thiab xov mus rau TFT subpixel ntawm TFT substrate (Ceeb toom: ib pixel muaj peb subpixels). Lub teeb dawb tso tawm ntawm lub nrig qaum yog hloov mus ua R, G thiab B xim tom qab xuas khoom. Tus TFT array yuav hloov qhov voltage tus nqi ntxiv rau txhua tus sub pixel, yog li hloov kev sib kis ntawm txhua lub teeb xim. Txawv siv ntawm RGB cov xim thiab lub teeb sib xyaw ua ke kom ncav xim.
6, muaj lwm hom, xws li hom MVA thiab hom IPS, uas yog tag nrho cov tshiab tsim LCD ua hauj lwm hom kev txhim kho cov yam ntxwv pom thiab txhim kho cov lus teb, thiab yog cov kev txhim kho ntawm TN hom

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7. Qhov chaw ntawm lub kaum sab nrauv thiab qis qis sab nraud (thiab lub ncov qaum thiab lub tshuab ntsuas) txiav txim siab qhov ci ci thiab lub xeev tsaus nti ntawm cov kua dej ua kua hauv lub xeev ntawm lub hwj chim thiab lub zog. Thaum lub nraub qaum thiab sab nraud polarizer mus rau lub npov thiab cov kev coj ntawm lub polarizer yog sib tshooj rau txhua qhov sib txawv, TN thiab STN hom yog nyob rau hauv lub xeev ci ntsa iab nyob rau hauv lub xeev uas tsis raug kaw (yog li nws yog hu ua cov square dawb zoo tib yam. Thaum lub npov sab saud thiab sab nraud tuaj yeem ua kom zoo li qub (piv txwv tias, lub ncov qaumteb thiab cov kev coj ntawm lub polarizers ntawm lub ncov ncawg (polarizer) sib luag ua ke), TN thiab STN hom nyob rau hauv lub npog lub xeev tsaus ntuj nti (yog li nws yog hu ua hom txwm dub) thiab lub hwj chim muaj zog thaum lub zog ntxiv.

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