LCD ua haujlwm lub hauv paus ntsiab lus: Backlight ua haujlwm ua ke nrog cov kua siv lead ua kua txheej.
Lcd txoj cai qhia kev cia siab rau cov kua siv lead ua kua 'cov nyhuv lub teeb: Lcd panels lawv tus kheej tsis ci, es tsis txhob, lawv tau teeb pom kev zoo los ntawm lub teeb pom kev zoo. Thiab tom qab ntawd lub teeb kis tau tus mob yog tswj los ntawm deflection ntawm cov kua siv lead ua kua thiab cov duab yog ua thaum kawg. Muaj 2 qhov tseem ceeb koom nrog ntawm no.
Backlight System: Lub teeb ci zoo li LED, lub teeb qhia phaj, diffusion zaj duab xis thiab lwm yam, kom muab lub teeb ci ntsa iab.
Liquid Crystal Layer: Muaj ob daim iav uas tuav Liquidcrystals nruab nrab ntawm lawv thiab cov molecules no muaj lawv qhov chaw hloov pauv raws li qhov hluav taws xob hluav taws xob thiaj li tuaj yeem ua rau cov khoom sib txawv ntawm qhov teeb pom kev zoo li cas.
Lub tswv yim tseem ceeb: Lub teeb rov qab tuaj yeem xav tau zoo li "lub teeb ci", cov kua siv lead ua kua ua tau zoo li qee yam "lub teeb valve", ob yam no ua haujlwm zoo nrog ib leeg. Thaum muaj teeb meem backlight ces peb yuav tsis pom muaj kev puas tsuaj ua rau cov siv lead ua txheej. Nws yuav ua rau txhua yam zaub tsis tuaj yeem.
Backlight puas raug phenomenon
Nyob ntawm seb yuav ua li cas mus tsis ncaj ncees lawm nrog rau hom backlight system nws yog raws li nram no rau lub LCD:
Tag nrho lub vijtsam dub lossis tam sim ntawd dimming
Qhov tshwm sim yog tias yuav tsis muaj dab tsi tshwm sim ntawm qhov screen lossis nws dhau los ua qhov tsis pom tseeb li tsis pom.
Yog vim li cas rau lub teeb rov qab tsis ua haujlwm yog tias lub teeb rov qab muaj qhov qhib qhov hluav taws xob hauv lub teeb pom kev zoo, muaj kev puas tsuaj rau cov khoom siv hluav taws xob xws li lub tshuab hluav taws xob puas, lossis tej zaum yuav muaj teeb meem ntawm lub hwj chim nrog qhov txawv txav ntawm lub hwj chim mov.
Cov ntaub ntawv tshawb fawb: Cov tshuaj ntsuam xyuas kev lag luam ntawm ib lub tuam txhab tsis tuaj yeem lees paub thiab cov duab thaum hmo ntuj vim tias lub teeb rov qab LED kev laus thiab yog li ua rau thawj zaug 300 cd / m2 txo qis mus txog 80 cd / m2.
Thiab nws qhov chaw tsaus lossis qhov kaj ci nyob ib puag ncig nws
Phenomenon: Ntawm qhov screen, tsis xwm yeem tsaus nti / ci ntsiab lus uas yog indistinct nyob rau hauv contour.
Yog vim li cas: khawb ntawm lub teeb qhia phaj, cov yeeb yaj kiab diffusion tsis raug, lossis nws tsuas yog tsis teeb rau hauv qhov chaw.
Case: Ib lub tsheb navigation system muaj nws lub teeb qhia daim hlau compressed uas coj mus rau ib tug 5 cm txoj kab uas hla qhov chaw tsaus nyob rau hauv qab sab xis sab ntawm lub screen.
Txawv txawv, flickering xim
Cov xim ntawm lub vijtsam mus ua tsis zoo li nws dhau los ua daj, lub teeb cia hloov pauv ntawm qhov kaj mus rau qhov tsaus ntuj.
Yog vim li cas yog qhov tsis sib npaug ntawm lub teeb pom kev zoo, suav nrog qhov sib txawv ntawm lub neej ntawm ib tus neeg RGB LEDs thiab qhov hloov pauv ntawm kev tsav tsheb.
Case: Qee yam khoom siv kho mob tau raug puas ntsoog ntawm ib sab kom tsis txhob tso cai rau pom qhov tseeb ntawm qhov screen thiab qhov ntawd yog vim 20% tsawg dua cov LEDs siv hauv teeb pom kev zoo uas ua rau txhua yam ntawm cov zaub tuaj yeem saib liab. Qhov no kuj cuam tshuam rau kev kuaj mob.
Cov suab nrov txawv txav lossis cua sov
Phenomena: Muaj lub suab nrov nrov tom qab lub vijtsam, lossis nws tau kub qhov kuv nyob.
luv Circuit Court ntawm backlight tsav Circuit Court / Capactitor tawg / overload ntawm boost kauj
Case: Ib lub TV ntse ntsib teeb meem nrog lub backlight high voltage board capacitor tsis ua hauj lwm ua rau qhov kub nyob rau sab nraum qab ntawm lub vijtsam yog nyob ntawm 65 degrees celsius uas ua rau cov ntaub ntawv yas kom deform.
Kev sib raug zoo ntawm backlight lub neej voj voog nrog LCD lub cev.
Lub neej ncua ntawm lub teeb rov qab txiav txim siab tag nrho LCD lub neej ncua.
Cov ntaub ntawv txhawb nqa:
CCFLback lub teeb: lifespan yog 20000-50000 teev, nws yog 7-17 xyoo yog tias koj siv 8 teev txhua hnub.
Lub neej ntev ntawm LED backlights yog: 50,000-100,000 teev (kwv yees li 17-34 xyoo)
Fail mechanism: Backlight yog nyob rau kom txog rau thaum 50% ntawm thawj brightness yog attained. Qhov kawg ntawm lub neej. Ntawm no txawm peb tuaj yeem ua kom peb lub vijtsam LCD ua haujlwm tab sis nws yuav nyuaj heev.
Ib rooj plaub: Ib qho kev lag luam HMI uas siv CCFL rov qab teeb. Qhov ci ntsa iab tau poob mus rau ib nrab hauv li tsib xyoos ntawm kev pabcuam thiab tag nrho chav tsev yuav tsum tau hloov.
Backlight tsis tuaj yeem ua rau tsis ncaj qha LCD lub cev puas tsuaj.
Overvoltage txaus ntshai, backlight tsav Circuit Court tsis ua hauj lwm tuaj yeem ua rau muaj qhov txawv txav tsis zoo, xws li mus ntawm 24V mus txog 2000V, thiab qhov ntawd tuaj yeem ua rau cov kua muaju 'electrode txheej.
Overheat: luv luv Circuit Court ntawm cov hlaws rov qab tuaj yeem tsim thaj tsam nrog qhov kub siab tshaj 100℃(liquidcrystal molecules tuaj yeem deformed, iav substrate yuav tawg).
Case - Qee yam ntawm sab nraum zoov ad tshuab, nws hlawv cov kua siv lead ua kua txheej mus tas li los ntawm kev ua haujlwm tsis zoo ntawm lub teeb pom kev zoo IC uas cia dhau ntawm 1500 volt mem tes.
rov qab teeb tswj txoj cai thiab ceev faj
Kev soj ntsuam Feasiblity ntawm Kev Kho
Kev lag luam: Backlight tivthaiv tus nqi coj los ntawm peb caug thiab tsib caug feem pua ntawm LCD cov nuj nqis. Yog hais tias lub LCD tsis muaj teeb meem nrog tus so ntawm nws ces tus ntawd yuav zoo nkauj heev.
Technical nyuaj:
Led backlights yuav tsum tau kho: yuav tsum tau hloov ntawm LED teeb bar los yog tsav tsheb board; lub teeb meem technical yog tsawg heev.
CCFL backlight maintance: High voltge circit shoule raug tuav, qhia tias nws yuav tsum tau ua los ntawm cov kws tshaj lij.
Ib qho xwm txheej tshwj xeeb ntawm qee hom lub khoos phis tawj lub khoos phis tawj lub khoos phis tawj tsis ua haujlwm vim tias nws lub teeb pom kev tsis zoo thiab yog tias koj tsuas yog xav yuav ib lub sawb tshiab ntawm cov teeb ci LED uas raug nqi ib ncig ntawm 200 yuan uas tseem yuav pheej yig dua li tsuas yog yuav lub khoos phis tawj tshiab nkaus xwb.
Cov kauj ruam tseem ceeb rau kev saib xyuas
Qhov chaw txhaum:
Siv lub multimeter kom paub seb qhov tso zis hluav taws xob yog dab tsi ntawm koj lub rooj tsav tsheb backlight.
Nrhiav qhov chaw faulty, nws zoo li teeb pom kev ntawm ib qho ntawm cov teeb pom kev zoo lossis yog tias nws tsuas yog muaj teeb meem me me nrog lub rooj tsav tsheb.
Hloov cov khoom siv:
Xaiv lub teeb sawb raws li koj qhov chaw cog ntoo zoo li qhov nws xav tau ntau npaum li cas, lub teeb zoo li cas thiab nws ci li cas.
Hnav anti static dab teg pluaj thaum hloov nws, tsis xav ua mob LCD.
Kev txheeb xyuas kev ua haujlwm:
Uniformity ntawm qhov screen brightness (qhov txawv yuav tsum yog<10%).
Khiav kev kuaj kev laus (khiav nws tsis tu ncua rau 48 teev), xyuas kom meej tias tsis muaj teeb meem tshwm sim.
Cov lus pom zoo rau kev tiv thaiv kev saib xyuas:
Kev Tswj Ib puag ncig: Tsis txhob tso lub LCD ntawm qhov kub siab tshaj 50℃lossis av noo tshaj 85RH rau lub sijhawm ntev.
Usage Habit: Reduce prolonged display with high-brightness (>60%) thiab khaws cia ntawm<70% brightness.
Kev Ntsuam Xyuas Tsis tu ncua: Siv lub ntsuas hluav taws xob txhua rau lub hlis rau kev ntsuas lub teeb rov qab qhov nrawm nrawm, thiab xyuas seb thaum twg koj yuav xav hloov nws.
