Raws li kua crystal qhia tau ua ntau thiab ntau dav siv nyob rau hauv txhua txhua hnub lub neej, lawv cov cwj pwm tseem ceeb, hom LCD tsav circuits, thiab qhov kev thov rau lawv tau nce. Raws li cov xwm txheej, kev kuaj ntawm kev tswj xyuas hauv kev lag luam hauv LCD ua tiav rau ntawm lub lem sab hauv lub lens, tab sis vim nws cov nqi siab, qhov kev ntsuam xyuas kuj tseem muaj zog ntxiv, ua ib lub hwjtxwv txwv tsis pub muaj kev tswj ntau ntawm LCD tswj tsav . Hauv kev saib ntawm cov nqe lus saum toj no, tsab xov xwm tawm tswv yim qauv rau kev tswj laub kev tsav tsheb hauv kauj vab ntawm cov qauv siv digital, thiaj li paub tias tus nqi pheej yig thiab kev soj ntsuam zoo siab ntawm LCD tswj tsav xwm ceev. Tib lub sij hawm, raws li cov yam ntxwv ntawm LCD tswj tsav Circuit Court, nrog rau cov kev ua tau zoo, qee cov tswv yim kev sim rau kev tswj xyuas LCD tsav tsheb.
1 Taw qhia
LCD cov cuab yeej siv tau siv ntau zaus vim yog lawv qhov zoo tshaj plaws xws li kev tsav tsheb tsawg tsawg thiab tsis muaj hwj chim ntau. Tshwj xeeb tshaj yog rau cov khoom xa khoom hauv tshuab hluav taws xob, daim ntawv thov ntawm cov kua qoob loo xws li STN thiab TFT tau ua kom sai. Qhov kev tso zis analog ntawm LCD tsav IC (LCD tsav IC) ncaj qha drives ntau yam LCD zaub panels thiab tswj cov kev ua haujlwm ntawm pixel arrays ntawm ntau lub monitor. Nws yog tus tub ntxhais ntaus ntawv ntawm LCD cov duab, thiab qhov zoo ntawm LCD tswj tsav tsheb ncaj qha ncaj qha. Cov nyhuv ntawm cov kua siv lead ua kua, yog li tsim cov qauv ntawm hom kev soj ntsuam no zoo li tseem ceeb. Tsab xov xwm no yog qhia txog kev yooj yim ntawm txoj kev tswj ntawm tus qauv tswj kev lag luam hauv kiab khw raws li cov kev sib tw digital thiab qee cov tswv yim uas tus sau sau ua haujlwm.
2 Teeb meem ntawm kev ntsuas LCD tsav Circuit Court
2.1 Ntau lub koob
Pes tsawg tus tsav tsheb ntawm tus qauv tswj kev tsav tsheb hauv LCD yog li tsawg li kaum, thiab ntau li ntau txhiab, cov khoom siv sib tw yuav tsum tsim kho ntau ntau ntawm cov kev xeem, feem ntau mus txog 256 mus rau 512 raws los yog 1024 dhau los.
2.2 Pua Cov Tsav Pim Tsav Tsheb
Rau xim 4096 xim xim, RGB peb xim muaj 16 theem ntawm grey rau txhua xim, sib nug xov mus rau 16 theem ntawm kev tsav hluav taws xob, uas yog 16 (R) & TImes; 16 (G) & TImes; 16 (B) = 4096, Yog tias nws yog ib qho tseeb xim xim, txhua xim yog 256 levels grey, sib thooj li 256 tsav voltages. Vim li no, cov khoom siv rau kev xeem ntawv yuav tsum muaj peev xwm ceev nrooj thiab meej ntsuas cov lus sib dhos ntawm tus leb analog tawm los ntawm tus neeg tsav tsheb LCD nrog kev daws teeb meem. Qhov no yog qhov tseem ceeb vim tias kev tsav tsheb tsis ruaj khov thiab muaj teebmeem thiab muaj kev nyuab siab rau LCD zaub.
2.3 Wide ntau ntawm qhov hluav taws xob output voltage
Tus khiav tawm voltage ntawm lub LCD tswj tsav Circuit Court ntau ntau dua qhov 5V voltage ntawm tus ciaj sia zoo tib yam CMOS, txawm tias tseem xeeb tshaj 30V, thiab vim yog qhov tseemceeb hauv cov npo LCD, lub polarity ntawm tus tsav tsheb yuav tsum tau tas li ntxeev siab. Yog li, rau cov khoom siv mus kuaj, ntsuas ntau yuav tsum ncav cuag 30V los yog ntau dua, thiab nws tuaj yeem tiv puag nrog kev hloov ntawm qhov kev sib pauj ntawm kev tsav tsheb.
2.4 Lwm tus
Rau qee tus qauv tsav tsheb, cov khoom siv mus kuaj yuav tsum tau haib teeb ntsuas tsom software kom ua zauv zauv nyob rau ntawm cov ntaub ntawv analog tau sampled hauv kev xeem channel kom tau cov xim xim ntawm txhua tus pixel thiab txiav txim seb lub xeev ntawm lub ntaus ntawv.
3 Lub Rooj Tswjhwm Saib Xyuas Kev Kuaj Tsav Xim Luam (LCD Control Drive)
Nws tuaj yeem pom los ntawm cov teeb meem raug thaum LCD tswj tsav tsheb yog sau cov lus saum toj no tias qhov kev soj ntsuam ntawm qhov kev soj ntsuam no yuav tsum muaj siab ntawm qhov kev xeem ntawm cov khoom xeem, qhov kev ntsuas zoo tshaj yog rau kev tswj laub tsav tsheb. TSIS TXUAS NTXHAIS KAWM TXOG TUS TSWV YIM TSIS TAU LOS NTAWM TUS KHEEJ NTXHAIS ZOG LOS NTAWM TUS KHEEJ NTXHAIS LOS NTAWM TUS TSWV YIM TSIS YOG TUS TSWV YUAV TSIS TAU NYIAJ YOG TUS TSWV YUAV TSIS TAU thiab ntau lawm. TS670 thiab TS6700 kev them yug tsuas yog ib tus neeg tsav tsheb LCD nkaus xwb, thiab cov zis tawm ntawm tus pin tso rau ntawm 736 pins. Txawm li cas los xij, vim muaj kev sib txuam ntawm cov tshuab siv ntau lub tshuab (LCD TVs, thiab lwm yam), tus naj npawb ntawm tus naj npawb ntawm tus naj npawb tam sim no yog los ntawm 300 taw rau 400 taws. Lub ko taw loj hlob tuaj mus txog 800 feet rau ntau tshaj 1 000 ko taw. Yokogawa lub ST6730, Advantech's ND1 thiab ND2, Teradyne's D750Ex, thiab lwm yam yuav pab txhawb qhov no (ND2 pab txhawb tus naj npawb suav 1 txog 1 500 Tshaj siab, D750Ex tuaj yeem pab txhawb txog 2 400 ko taw).
Txawm li cas los xij, kev xav txog qhov nce ntawm tus nqi ntawm qhov kev xeem, rau qee qhov kev tswj xyuas lub koob yees duab hauv LCD kuj tseem siv tau cov kab ke digital rau kev sim yooj yim. Cov nram qab no yuav qhia txoj kev xeem ntawm LCD tswj tsav tsheb kauj vab raws li cov qauv xeem qhov system.
Tus tswj kev tsav tsheb hauv kev lag luam hauv LCD, zoo ib yam li lwm yam kev sib tw, yuav tsum tau kuaj qee cov khoom siv qis thiab tseem muaj qee cov kev kuaj tshwj xeeb vim nws tus kheej cov yam ntxwv.
3.1 Kev Ntsuam Xyuas Qhov Tseeb
Ib yam li cov qauv ntawm cov ntsiab lus ntawm lub logic, qhov kev ua haujlwm ntawm LCD tswj tsav tsheb yuav tsum xyuas txhua qhov function module ntawm Circuit Court. Txawm li cas los xij, qhov lem teeb ntawm LCD tsav teeb liab zis tshooj dav hlau ntawm lub LCD tswj tsav tsheb tsis yog ib qho logic ntawm "0" lossis "1" ntawm ib qho kev siv dav dav dav, tab sis ib qho teeb meem ntawm analog. Thaum ib qho kev xeem raug siv rau kev sim, yuav tsum tau kuaj tib lub voj voos. Cov cai xaiv ob theem pib rau ob qhov kev ntsuam xyuas kom ua tiav ib qho kev sim yooj yim ntawm cov leb tawm sab hauv lub laub.
3.1.1 Cov Kev Pab Qhia Ntawv
Qee cov tsav ntawm lub LCD muaj cov chaw nruab nrog RAM, uas yuav tsum tau muab sau tsawg kawg hauv checkerboard hom sau 0101, 1010 cov ntaub ntawv los ntsuam xyuas lawv cov ntawv nyeem thiab sau ntawv, yog li cov chaw nyob ib sab nyob hauv ntau lub xeev, thiab qee zaus txawm tias yuav tsum sau ntawv. Sau tag nrho 0 thiab tag nrho 1 cov ntaub ntawv rau tag nrho cov kev kuaj mob.
3.1.2 Lub Tswv Yim Cov Lus Qhia II
Cov kev sim xaiv qhov kev ua qee zaum kuj yuav tsum tau sau ib daim ntawv los ntawm lawv tus kheej, tsis yog tsim los ntawm tus qauv ntawm cov qauv simulation. Nyob rau lub sij hawm no, sib txuas cov yam tseem ceeb ntawm cov sij hawm xeem thiab txo cov nqi xeem yuav tsum tau ceev faj txog qhov kev ua haujlwm ntawm kev ua haujlwm kom thiaj li kaw tau tag nrho cov haujlwm ntawm Circuit Court. , Thiab tuaj yeem txo cov sij hawm xeem. Qhov no yog nyob ntawm nws qhov kev nkag siab ntawm Circuit's lub cev thiab kev ua tau zoo.
Piv txwv, tus tswj kev tsav tsheb hauv LCD yuav tsum nyeem thiab sau ob kab lus ntawm cov ntaub ntawv txuas los ntawm Circuit Court kom tiav cov ntaub ntawv ntawm cov lus txib thiab cov ntaub ntawv thaum lub sijhawm kuaj, thiab sib koom ua ke nrog lwm lub chaw logic los tso saib cov ntaub ntawv sau tseg ntawm qhov chaw nres tsheb LCD. Kev kuaj ntawm nws cov chav nyob RAM tuaj yeem tshawb pom tseeb tseeb ntawm qhov chaw nres nkoj, tsis tas yuav tsum xa mus rau tus tsav tsheb hauv LCD, thiab qhov chaw nyeem ob sab / sau ntawv yuav tsum ceev tshaj qhov tso zis, yog li thaum lub sijhawm kuaj hauv RAM no, nws tuaj yeem tsim nyog Nyeem cov ntawv nyeem thiab sau ua moos kom txo cov sij hawm xeem.
3.2 ntsuas kev ntsuas
Lwm qhov kev ntsuas kev ntsuas ntawm tus tsav hluav taws xob hauv LCD yeej yog tib yam li cov phiaj xwm digital. Nov yog qee qhov tshwj xeeb tsis zoo uas xav tau.
3.2.1 Cov Qauv Tawm Tsav Tsheb
Raws li tau hais ua ntej, txhua yam tsis muaj tus neeg tsav tsheb hauv LCD, tus tsav tsheb khiav tawm LCD (los yog tso zis tawm qhov hluav taws xob ntawm LCD, qhov tso zis tawm hauv lub tshuab hluav taws xob) yog qhov tseem ceeb parameter. Nws muaj ib tug cwj pwm cuam tshuam rau cov nyhuv ntawm LCD cov cuab yeej siv, tshwj xeeb tshaj yog rau cov khoom siv nrog cov lus loj (ntau pixel ntsiab lus), tus tsav tsheb khiav pins ntawm tus tswj kev tsav tsheb hauv LCD yog ntau dua yog tias lub pins nyob hauv tib lub thauj khoom. Yog tias qhov hluav taws xob qhov hluav taws xob tsis loj heev, cov duab xim ntawm txhua lub pixel ntawm cov duab LCD yuav yog qhov tsis sib haum. Vim li no, cov zis voltage deviations ntawm tag nrho cov tsav zis pins ntawm tus tswj LCD tsav tsheb nyob rau hauv tib lub load yuav tsum tau kuaj ib ntawm ib. Txhawm rau xyuas kom meej tias lawv yog txhua yam nyob rau hauv cov kev pom zoo.
Feem ntau, lub sijhawm xeem ntawm DC parameter test unit ntawm qhov kev xeem no yog ntau ntau rau ob peb lub hlis ntawm cov milliseconds. Yog li, qhov ntau ntawm cov tsav tsheb tawm ntawm lub voj voog, qhov ntev ntawm lub sij hawm xeem ntawm cov khoom no yuav yog, thiab qhov nqi ntawm qhov khoom siv ntawm qhov Circuit Court yuav nce ntxiv. . Qhov kev sim zoo dua yog:
(1) Rau kev sib xyaw cov kev sib tw hauv LCD, nws muaj ntau ntau cov qauv (DigiTIzer) uas siv tau los ua cov qauv ntawm kev ua haujlwm tsis tu ncua kom lub vaj huam sib luag ua tiav qhov kev xeem no nyob rau lub sijhawm luv luv. Piv txwv li, Yokogawa tus ST6730 kuaj qhov teeb meem yog teeb nrog cov qauv siv cov zis LCD, thaum Advantech qhov kev ntsuam xyuas kab mob nruab nrog lub digital sampler rau txhua txhua 8 LCD zis pins.
Daim duab qauv ntawm cov qauv kev sib tw ntawm daim qauv no yog qhia hauv daim duab 1.
Lub
Daim duab 1 Daim duab qauv ntawm cov qauv txheej txheem
(2) Qee qhov kev sim khoom muaj ib tug load pin (AcTIve load). Yog tias qhov kev khiav hauj lwm muaj zog ntawm txhua qhov chaw ntawm lub LCD tsav ntaus ntawv nyob rau hauv kev xeem yog nyob rau hauv qhov kev tso cai ntawm kev kho vajtse, thiab muaj kev ntsuam xyuas txaus, txhua tus tuaj yeem siv tau. Tus txheej txheem rau kev ua haujlwm ntawm tus tsav tsheb ua tsav tsheb ntawm tus tsav tsheb ntawm tus tsav tsheb ntawm LCD tau yooj yim thiab lub sij hawm txuag kom tiav qhov kev ntsuas ntawm qhov ntsuas no tib lub sij hawm raws li kev sim ua haujlwm. Daim duab ntawm daim duab no yog qhia hauv daim duab 2.
3.2.2 dynamic ib nrab tawm siab mus kuaj
Qhov kev ntsuas no tsis yog qhov tseem ceeb ntawm tus qauv tswj kev lag luam hauv kev lag luam hauv LCD, tab sis thaum siv lub system los sim ua hom kab sib chaws no, ntxiv qhov kev ntsuas ntawm qhov kev xeem no yuav ua tau zoo dua qhov nqi foob ntawm qhov Circuit Court. Qhov kev xeem tshwj xeeb yog:
Sau cov ntaub ntawv, yog li ntawd tus neeg tsav tsheb hauv Circuit LCD tawm dav dav dav tuaj yeem tso saib txhua zaus hauv checkerboard, thiab ua rau muaj kev khiav dej num tam sim no ntawm txhua qhov ntsuas qhov kawg ntawm cov tswv yim.
Daim duab 2 Schematic daim duab ntawm txoj kev ua haujlwm rau kev tsav tsheb rau cov twj tso tawm tus pin nrog load
4 Xaus
Nrog rau kev paub txog science thiab technology, ntau yam kev tsav tsheb hauv lub LCD kuj hloov nrog txhua hnub dhau los. Rau qhov series ntawm circuits, txoj kev sim no kuj sib txawv rau kev sib txawv ntawm Circuit Court. Tsab xov xwm no tsuas yog siv txoj kev ntsuas ntawm tus qauv tswj kev lag luam hauv kiab khw raws li cov kev xeem tawm, thiab qhia tawm ib co lus qhia uas tus kws sau sau ua haujlwm. Nws yog tsim rau qis-nqi, zoo siab ntawm LCD tswj tsav circuits.
