Passive Matrix (PM) LCD cov lus qhia cia siab rau cov roj sib txawv ua kua crystal kom tswj hwm lub teeb. Cov kev teeb tsa no sau cov txheej txheem ua kua muaju thiab lawv lub luag haujlwm hauv lub teeb ua los tsim cov duab. Ntawm no yog cov ntsiab lus ntawm cov khoom siv ua kua siv lead ua kua hauv PM qhia:
- Twisted Nematic (tn)
Hauv TN cov lus qhia, ua kua muaju tau sib ntswg hauv cov qauv helical thiab untwist thaum daim ntawv thov voltage, ua rau lub teeb voltage, ua rau lub teeb ci mus dhau los ntawm cov degrees. TN Cov kev teeb tsa tau raug lees paub rau lawv cov nqi ntau lawm thiab lub sijhawm teb sai sai, ua rau lawv tsim nyog rau cov kev yuav tsum tau ua.
- Super Twisted Nematic (STN)
Stn sawv cev rau kev txhim kho tn, nrog kua muaju sib ntswg sib ntswg (feem ntau ntawm 180℃thiab 270 degree). Qhov no tso cai rau kev txhim kho passive matrix hais txog cov schemes, yielding adjected zoo sib xws thiab saib cov ces kaum sib piv rau tn. STN qhia feem ntau muaj cov sijhawm qeeb qeeb thiab tau ua haujlwm hauv cov ntawv thov qhov raug thiab cov lus teb tau hais tsis tau.
- Zaj duab xis nyiaj them nyiaj Super Twisted Nematic (FSTN)
FSTN suav ua yeeb yam them nyiaj ua ntej rau hauv STN zaub los txhim kho cov duab teeb pom kev zoo. Cov yees duab them yeeb yaj kiab mitigates cov xim ua haujlwm pom nyob rau hauv cov qauv stns, xws li cov ntawv saib digital thiab lub laij.
- Ob chav txheej Super Twisted Nematic (DSTN)
DSTN thev naus laus zis ua haujlwm ob txheej ua kua muaju ua kua rau qhov ua tau zoo piv rau cov qauv STN los ntawm kev ploj zuj zus thiab txhim kho kev ua kom zoo nkauj. DSTN kev teeb tsa tau nthuav dav ntau dua ua ntej qhov dav dav ntawm nyias-zaj duab xis trantor (TFT) cov lus.
Txhua ntawm cov kev teeb tsa no muaj qhov tshwj xeeb thiab kev lag luam tawm, ua haujlwm rau lawv ntau dua lossis tsawg dua rau ntau yam kev siv. TN yog favored rau nws qhov nrawm, ua rau nws pom zoo hauv lub laij lej thiab cov khoom siv cov khoom siv ntau dua uas tseem muaj txiaj ntsig zoo dua thiab yooj yim ntawm passive matrix thev naus laus zis.
