Cov khoom ua kua siv lead ua kua (LCD) yog lub vaj huam sib luag tiaj tus lossis lwm yam khoom siv hluav taws xob hloov kho qhov muag uas siv lub teeb-modulating zog ntawm cov kua muaju ua ke nrog cov polarizers.
Cov kua siv lead ua kua tsis tawm lub teeb ncaj qha, tsis yog siv lub teeb pom kev zoo lossis lub teeb pom kev los tsim cov duab hauv cov xim lossis monochrome.LCDs muaj los tso saib cov duab arbitrary (xws li hauv lub khoos phis tawj lub hom phiaj dav dav) lossis cov duab ruaj khov nrog cov ntsiab lus tsis tshua muaj, uas tuaj yeem ua tau yuav tshwm los yog zais.
Piv txwv li: cov lus preset, tus lej, thiab xya ntu qhia, xws li hauv lub moos digital, yog tag nrho cov piv txwv zoo ntawm cov khoom siv nrog cov lus qhia no. Lawv siv tib lub thev naus laus zis, tshwj tsis yog tias cov duab arbitrary yog tsim los ntawm matrix ntawm me me pixels, thaum lwm cov lus qhia muaj cov ntsiab lus loj dua. LCDs tuaj yeem yog ib txwm nyob ntawm (zoo) lossis tawm (tsis zoo), nyob ntawm qhov kev npaj polarizer. Piv txwv li, tus cwj pwm zoo LCD nrog lub teeb pom kev zoo yuav muaj cov ntawv dub rau ntawm keeb kwm yav dhau uas yog xim ntawm lub teeb pom kev zoo, thiab tus cwj pwm tsis zoo LCD yuav muaj keeb kwm yav dhau los dub nrog cov ntawv ua xim tib yam li lub teeb pom kev. Cov ntxaij lim dej kho qhov muag tau ntxiv rau dawb ntawm xiav LCDs muab lawv cov yam ntxwv zoo li.
LCDs yog siv nyob rau hauv ntau yam kev siv, xws li LCD TVs, computer saib, ntsuas vaj huam sib luag, aircraft cockpit qhia, thiab sab hauv tsev thiab sab nraum zoov signage. Cov ntxaij vab tshaus LCD me muaj nyob rau hauv LCD projectors thiab cov khoom siv nqa tau yooj yim xws li cov koob yees duab digital, watches, digital moos, lub laij lej, thiab xov tooj ntawm tes, suav nrog cov xov tooj smartphones. Cov ntxaij vab tshaus LCD kuj tseem siv tau rau cov khoom siv hluav taws xob xws li DVD player, video game devices, thiab moos. Cov ntxaij vab tshaus LCD tau hloov hnyav, loj loj cathode ray tube (CRT) qhia hauv yuav luag txhua daim ntawv thov. LCD cov ntxaij vab tshaus muaj nyob rau hauv ntau qhov ntau ntawm cov tshuaj ntsuam ntau dua li CRT thiab plasma cov lus qhia, nrog cov ntxaij vab tshaus LCD muaj nyob rau hauv ntau thiab tsawg xws li me me digital watches mus rau TV receivers loj heev.