Nyob rau hauv cov txheej txheem kev tsim kho tshiab ntev thiab nyuaj ntawm PC kev lag luam, nrog rau kev nce qib ntawm cov khoom siv thev naus laus zis, kev faib tawm ntawm cov duab tau dhau los ua cov ncauj lus kom ntxaws, uas tuaj yeem muab faib ua cov vaj huam sib luag tiaj tus (FPD) thiab cathode ray tubes (CRT), tseem hu ua flat-screen displays. CRT yog tus thawj tswj hwm ntawm cov zaub thaum FPD tsis paub tab, thev naus laus zis paub tab, tus nqi pheej yig, xim yog qhov tseeb, thiab lub sijhawm teb luv luv. Txawm li cas los xij, vim nws qhov loj me, flicker, duab distortion thiab lwm yam tsis xws luag, cov pej xeem kev ua lag luam tau maj mam hloov los ntawm FPD. Lub vaj huam sib luag tiaj tiaj, raws li lub npe qhia, yog cov zaub uas muaj cov tuab tuab. Nws tuaj yeem muab faib ua LCD kua siv lead ua zaub, PDP plasma zaub, OLED organic teeb emitting diode zaub, FED teb emission zaub, thiab lwm yam hauv kev siv niaj hnub, tsuas yog LCD kua siv lead ua zaub yog nrov. Ntau tus neeg tsis paub tias CRT saib yog dab tsi, thiab qhov txawv ntawm CRT saib thiab cov kua siv lead ua kua saib yog dab tsi? Tus editor npaj cov ntaub ntawv tseem ceeb hauv qab no:
Dab tsi yog crt saib?
Lub npe scientific ntawm CRT zaub yog "Cathode Ray Tube", uas yog cov khoom siv cathode ray tube (Cathode Ray Tube). Nws tsuas yog muaj tsib qhov chaw: Electron Phom, Deflection Coils, Duab ntxoov ntxoo Mask, High Voltage Graphite Electrode thiab Phosphor Txheej thiab iav vaj tse. Nws yog ib qho ntawm feem ntau siv saib. CRT flat-screen saib muaj lub kaum sab xis pom loj, cov xim siab rov ua dua yam tsis muaj cov pixels tuag, tsis sib xws chromaticity, kho tau ntau hom kev daws teeb meem, thiab lub sijhawm teb luv heev. LCD saib yog qhov nyuaj tshaj. qhov zoo, thiab tus nqi pheej yig dua.
LCD zaub yog dab tsi?
Cov kua siv lead ua kua, los yog LCD (Liquid Crystal Display), yog lub tiaj tus ultra-thin zaub ntaus ntawv, uas muaj qee tus naj npawb ntawm cov xim lossis xim dub thiab dawb pixels, muab tso rau pem hauv ntej ntawm lub teeb lossis lub ntsej muag pom. Cov kua siv lead ua kua muaj kev siv hluav taws xob tsawg, yog li lawv nyiam los ntawm cov kws tsim khoom thiab tsim nyog rau cov khoom siv hluav taws xob uas khiav ntawm cov roj teeb. Nws lub hauv paus ntsiab lus yog los txhawb cov kua siv lead ua kua molecules los tsim cov dots thiab kab, thiab qhov saum npoo yog sib npaug nrog lub teeb rov qab los ua daim duab.
CRTs txhua tus hais tias lawv tau dhau qhov "TCOXX" ntawv pov thawj los qhia tias lawv cov hluav taws xob tsawg thiab kev puas tsuaj rau tib neeg lub cev yog me me, tab sis txawm tias qhov hluav taws xob me me, yuav muaj tiag tiag. Lub hauv paus ntsiab lus ua haujlwm ntawm LCD txiav txim siab tias nws tsis muaj hluav taws xob txhua, yog li LCD feem ntau cim nws tus kheej nrog cov lus xws li "zero radiation". Hais txog qhov ntim, qhov tob ntawm CRT yog kwv yees sib npaug ntawm nws kab pheeb ces kaum ntev, uas yog hais tias, qhov loj dua qhov chaw tso saib ntawm CRT, qhov loj dua nws lub ntim, uas feem ntau siv ntau qhov chaw desktop rau cov neeg siv. Thiab txawm hais tias LCD yog 15 ntiv tes lossis 19 ntiv tes, qhov tuab tsuas yog ob peb centimeters lossis kaum centimeters, thiab nws tuaj yeem dai rau ntawm phab ntsa, uas CRT tsis tuaj yeem ua li cas. Hais txog tus nqi, tus nqi tam sim no ntawm ib qho 17-inch tiaj tus vaj huam sib luag siv Trinitron daim duab raj yog kwv yees li 2500-3000 yuan, thiab lub LCD nrog ze li ntawm tib qhov chaw saib yog tsawg kawg yog ze li ntawm 4000 yuan, thiab ib tug me ntsis kim LCD Nws feem ntau yog rau los yog xya txhiab yuan, uas tsis yog ib yam dab tsi uas cov tsev neeg zoo tib yam yuav txais tau.
Thaum nws los txog xim, LCDs tsis zoo li CRTs. Hauv kev xav, CRTs tuaj yeem tso saib ntau xim li TVs. Lub LCD tsuas tuaj yeem tso saib txog 260,000 xim, feem ntau ntawm cov khoom thov tuaj yeem tso tawm 16.77 lab xim (16,777,216 xim, 32 khoom), tab sis qhov tseeb lawv txhua tus paub los ntawm dithering, uas txawv ntawm qhov tiag 32 ntsis. Tseem muaj qhov sib txawv loj hauv cov xim sib piv, yog li nws tseem tsis zoo li CRT ib txwm muaj nyob rau hauv cov nqe lus ntawm cov xim qhia thiab kev hloov. Los ntawm tib lub token, LCDs tsis zoo li sawv cev greyscale li CRTs. Yog tias koj muaj cov xwm txheej, koj tuaj yeem muab piv rau koj tus kheej. Tom ntej: nrhiav ib qho 17-inch Trinitron zaub, thiab tom qab ntawd tso 15-inch LCD los tso saib 16.77 lab-xim duab tib lub sijhawm. Daim duab tso tawm los ntawm CRT yog ci heev, thaum lub LCD yog me ntsis "dag". Txawm hais tias tsis muaj dab tsi tsis ncaj ncees lawm, nws tsis zoo li CRT nrog lub raj ntev.
Cov zaub ua haujlwm ntawm cov kua siv lead ua kua zaub feem ntau muaj lub teeb pom kev ntawm backlight, thiab qhov ci ntawm lub teeb ci no txiav txim siab qhov ci thiab xim saturation ntawm tag nrho LCD npo. Raws li kev hais lus, qhov siab dua qhov ci ntawm cov kua siv lead ua kua, qhov zoo dua, qhov ntsuas ntawm qhov ci yog cd / m2 (square candle per meter), kuj hu ua NIT lumens. Tam sim no, feem ntau ntawm qhov ci ntawm TFT npo pib los ntawm 150Nits, thiab feem ntau 200Nits tuaj yeem pom cov duab zoo dua. Qhov sib txawv kuj yog ib qho kev ntsuas ntawm qhov sib txawv ntawm qhov sib txawv ntawm cov xim dub thiab dawb. Thaum qhov sib piv piv yog 120: 1, nws tuaj yeem tso saib cov xim zoo nkauj thiab nplua nuj (vim qhov sib piv piv uas tib neeg lub qhov muag tuaj yeem paub qhov txawv yog li 100: 1), thiab thaum qhov sib piv sib piv siab li 300: 1, nws tuaj yeem txhawb nqa. xim ntawm txhua qib. Qhov sib piv ntawm feem ntau LCD saib hnub no yog nyob ib ncig ntawm 100: 1 ~ 300: 1. Tsis muaj tus nqi ncaj ncees los ntsuas qhov sib piv tus nqi ntawm qhov ci thiab qhov sib txawv, yog li kev yuav LCD nyob ntawm ob lub qhov muag ntse.
Feem ntau tam sim no lub vijtsam tiaj tus saib muaj lub kaum sab xis ntawm 180 degrees, uas txhais tau hais tias cov ntsiab lus tso tawm tuaj yeem pom meej meej los ntawm txhua qhov kev taw qhia ntawm lub vijtsam. Lub LCD yog txawv. Nws lub kaum sab xis saib txawv raws li cov cuab yeej siv siab heev. Lub kaum sab xis saib ntawm qee cov khoom tshiab tuaj yeem ncav cuag li 160 degrees, uas yog ze rau 180 degrees ntawm CRT. Kuj tseem muaj qee qhov LCDs nrog lub kaum sab xis pom ntawm 160 degrees, tab sis qhov tseeb lawv tsis ua raws li tus qauv no. Thaum tus nees luav tau siv, ib zaug lub kaum sab xis pom tshaj nws qhov kev pom tseeb, cov xim ntawm daim duab yuav txo qis, ua kom tsaus, thiab txawm tig cov duab zoo rau hauv daim duab tsis zoo.
Kev daws teeb meem yog qhov ntsuas kev ua tau zoo heev. Nws hais txog tus naj npawb ntawm cov dots uas tuaj yeem pom nyob rau hauv kab rov tav thiab ntsug cov lus qhia ntawm lub vijtsam (kab thiab qhov chaw pom ntawm lub vijtsam yog tsim los ntawm cov dots). Qhov siab dua qhov kev daws teeb meem, cov ntaub ntawv ntau tuaj yeem haum rau hauv tib lub vijtsam. Rau CRT uas tuaj yeem txhawb nqa 1280x 1024 daws teeb meem, txawm tias nws yog 320x 240 lossis 1280x 1024 kev daws teeb meem, nws tuaj yeem ua tau zoo kawg nkaus (vim tias lub teeb hluav taws xob tuaj yeem hloov kho elastically). Tab sis nws qhov kev daws teeb meem siab tshaj plaws yuav tsis yog qhov kev daws teeb meem zoo tshaj plaws, vim tias yog 17 khub ntawm cov saib mus txog 1280x 1024 kev daws teeb meem, font ntawm WINDOWS yuav me me, thiab ob lub qhov muag yuav yooj yim nkees rau lub sijhawm ntev, yog li qhov kev daws teeb meem siab tshaj plaws ntawm lub qhov rais. 17-inch saib ** Kev daws teeb meem yuav tsum yog 1024x768.
Tab sis tsis yog li ntawd rau LCD. Qhov siab tshaj plaws daws teeb meem ntawm LCD yog nws qhov kev daws teeb meem tiag tiag, uas yog qhov kev daws teeb meem siab tshaj plaws. Thaum lub teeb daws teeb meem me dua qhov kev daws teeb meem tiag tiag (xws li 15-}inch LCD, qhov kev daws teeb meem tiag tiag yog 1024x768, thiab qhov teeb meem teeb tsa hauv WINDOWS yog 800x600), yuav muaj ob hom zaub. Ib qho yog qhov nruab nrab cov zaub, tsuas yog 800x600 dots nyob rau hauv nruab nrab ntawm LCD yuav tso saib cov duab, lwm cov dots tsis siv yuav tsis tawm lub teeb, khaws qhov tsaus nti tom qab, thiab zoo li daim duab yog nruab nrab thiab txo qis. Lwm qhov yog txhawm rau nthuav tawm cov zaub, uas yuav siv txhua pixel ntawm lub vijtsam, tab sis vim tias cov pixels tau yooj yim distorted, nws yuav muaj qee yam cuam tshuam rau cov khoom siv.
