Cov zaub zoo ntawm LED zaub yeej ib txwm muaj kev cuam tshuam zoo rau cov nti tsav tam sim no, xws li ghosting, tuag pixel crosses, qis grey cam khwb cia, tsaus ua ntej scan, siab sib txuas, thiab lwm yam, thiab kab tsav ib txwm ua tau yooj yim scanning. kev xav tau. Nco ntsoov ntau dhau. Nrog rau kev tsim cov suab me me, LED cov ntxaij vab tshaus tseem muab cov kev xav tau siab dua rau kev tsav tsheb, los ntawm P-MOSFET ntshiab kom paub txog kev hloov kab, mus rau kev sib koom ua ke ntau dua thiab muaj zog ntau txoj kev tsav tsheb. Kev tsim thiab kev xaiv ntawm tus neeg tsav tsheb kab kuj tseem ntsib rau 6 qhov teeb meem loj ntawm kev tshem tawm dab, lub teeb hlaws rov qab voltage, luv luv Circuit Court caterpillar, qhib ntoo khaub lig, teeb hlaws VF tus nqi loj dhau, thiab qhov sib txawv siab sib txuas.
Dab
Thaum lub scanning screen hloov, nws yuav siv sij hawm ib pliag rau lub PMOS raj hloov mus rau thiab tawm thiab tus nqi paug ntawm kab kab kab mob parasitic capacitance Cr. Yog li ntawd, thaum lub sij hawm thaum kab tom ntej scans VLED thiab OUT, tus nqi unreleased ntawm kab dhau los scans VLED muaj txoj kev conduction. Thaum Row(n) qhib, kab kab kab mob cab Cr raug them rau VCC peev xwm. Thaum hloov mus rau Kab (n ntxiv rau 1), muaj peev xwm sib txawv ntawm Cr thiab OUT, thiab tus nqi raug tso tawm los ntawm lub teeb hlaws, ua rau lub teeb pom kev tsis zoo.
Full xim coj zaub
Yog li ntawd, thaum lub sijhawm hloov kab, tus nqi ntawm Cr yuav tsum tau tso tawm ua ntej. Feem ntau, ib txoj kab raj nrog kev sib xyaw ua ke ua haujlwm tuaj yeem tso tawm tus nqi ntawm cov kab mob cab cab Cr thaum hloov pauv los ntawm kev ntxiv lub voj voog rub-down. Qhov qis dua lub peev xwm rub-down, uas yog, qhov blanking voltage VH, qhov ceev ntawm tus nqi ntawm cov kab mob parasitic capacitance yuav raug tso tawm, thiab qhov zoo dua ntawm kev tshem tawm cov duab dab. Feem ntau, VH Lub teeb hlaws rov qab voltage Qhov rov qab impulse voltage ntawm lub teeb hlaws zoo heev cuam tshuam rau lub neej kev pab cuam ntawm lub teeb hlaws. Cov tuag pixels tshwm sim los ntawm lub siab rov qab ib txwm yog cov ntsiab lus mob ntawm LED zaub, tshwj xeeb tshaj yog lub suab me me. Thaum lub tso zis channel raug kaw, vim yog lub freewheeling nyhuv ntawm cov kab mob parasitic inductance, cov kab mob cab capacitance ntawm cov channel yuav txuas ntxiv raug them, ua rau muaj kev kub ntxhov heev. Nyob rau lub sijhawm no, nws tsim qhov rov qab voltage loaded ntawm lub teeb hlaws nrog cov zis ntawm cov kab raj, yog li qhov blanking voltage ntawm kab raj cuam tshuam rau qhov rov qab voltage ntawm lub teeb hlaws tib lub sijhawm. Thaum qhov voltage ntawm qhov tam sim no tso zis channel yog tsau, qhov siab dua qhov blanking voltage ntawm kab raj, qhov me dua qhov rov qab voltage ntawm lub teeb hlaws. Feem ntau qhov nominal rov qab voltage ntawm lub teeb hlaws yog 5V. Qhov tseeb tau sim los ntawm cov chaw tsim khoom, lub nraub qaum siab hauv qab 1.4V tuaj yeem txo cov pixels tuag los ntawm lub nraub qaum. Yog li, qhov blanking voltage tsis tuaj yeem qis dhau rau lub teeb hlaws rov qab teeb meem. Tsis qis dua VCC-2V. Short circuit kab ntsig Thaum lub LED yog luv luv, yuav muaj qhov tshwm sim ntev-ci, uas feem ntau hu ua luv luv-circuit caterpillar. Thaum lub teeb ci LED hlaws hauv nruab nrab yog luv luv, LED teeb hlaws hauv tib kem yuav tsim ib txoj hauv kev raws li qhia hauv daim duab hauv qab no thaum luam mus rau kab. Yog tias qhov sib txawv ntawm qhov sib txawv ntawm VLED thiab point A yog ntau dua li LED teeb hlaws teeb pom kev zoo, nws yuav tsim ib kem ib txwm. Ci kab ntsig. Qhov loj tshaj qhov sib txawv ntawm lub luv luv-circuit caterpillar thiab qhib tus ntoo khaub lig yog tias ntev npaum li qhov screen nyob rau hauv lub xeev scanning, lub short-circuit caterpillar yuav tshwm tsis hais seb lub LED teeb hlaws dai qhia ib tug duab, thiab qhib-circuit caterpillar. yuav tsuas muaj qhov teeb meem qhib qhib thaum qhib lub teeb hlaws tau teeb. Feem ntau los ntawm kev ua kom cov kab hluav taws xob blanking voltage, qhov sib txawv ntawm qhov hluav taws xob tsawg dua li LED rau pem hauv ntej voltage VF, uas yog, VLED-VH Qhib txoj kev hla Thaum muaj qhov qhib hluav taws xob ntawm lub teeb hlaws hauv qhov kev tshuaj ntsuam xyuas thiab lub ntsiab lus tau teeb, qhov voltage ntawm channel OUT1 yog rub mus rau hauv qab 0.5V. Yog hais tias lub scan kab muaj peev xwm blanking voltage VH yog 3.5V, ib tug conduction txoj kev yuav raug tsim rau lub kem ntawm lub teeb hlaws dai, tsim ib tug qhib-circuit kab ntsig. Thaum lub teeb hlaws qhib, channel OUT1 voltage yog rub mus rau hauv qab 0.5V lossis txawm tias 0V, thiab cov kab mob cab kab mob Cr ntawm kab yog cuam tshuam los ntawm cov kab mob cab C1 thiab C2. Thaum lub peev xwm Cr raug rub, cov LEDs nyob rau hauv tib kab raws li qhib lub teeb hlaws tshwm faintly ci. Txo qhov blanking voltage ntawm blanking kab raj tuaj yeem daws tau qhov teeb meem qhib qhib, uas yog, qhov hluav taws xob blanking VH<1.4v. some="" line="" tubes="" in="" the="" industry="" also="" use="" adjustable="" blanking="" voltage="" to="" reduce="" the="" blanking="" voltage="" to="" below="" 1.4v="" to="" solve="" the="" open="" cross,="" but="" this="" will="" increase="" the="" led="" back="" pressure="" and="" accelerate="" the="" led="" lamp="" bead="" damage="" and="" short-circuit=""> 20170505100853_59736.jpg Teeb hlaws VF tus nqi loj dhau Cov kem ib txwm nyob rau vim qhov loj VF tus nqi ntawm lub teeb hlaws kuj yog ib qho teeb meem uas plagues neeg siv. Feem ntau, qhov nominal rau pem hauv ntej voltage VF ntawm lub teeb ntsuab yog 2.4 ~ 3.4V. Raws li ib txwm muaj, lub teeb ntsuab anode thiab cathode voltage qhov sib txawv ntawm 1.8V tuaj yeem ua rau nws pom kev, thiab qhov hluav taws xob blanking VH ntawm kab raj yuav siab dhau, uas yuav ua rau lub teeb ci. Take the lamp bead forward voltage VF1=3.4V as the column, when scanning to the second lamp bead, VOUT and VLED1 are turned on at the same time, the channel end voltage: VOUT=VLED1-VF1, the voltage across the other rows of the lamp bead in the column: V△=VH -VOUT=VH-VLED1+VF1, if V△>1.8V, it may cause the column to be always on, that is, VH-VLED1+VF1>1.8V, where VLED=VCC (ignoring the voltage drop of the line tube), so VH>VCC-1.6 V tsis haum rau kev daws teeb meem ntawm lub teeb tas li tshwm sim los ntawm lub teeb hlaws VF tus nqi loj dhau. High contrast coupling High-contrast coupling yog hais txog superimposing ci duab nyob rau hauv ib tug low-brightness keeb kwm yav dhau, thiab cov cheeb tsam uas cov duab qis thiab cov duab ci siab nyob rau hauv tib xim cam khwb cia thiab darken. Cov kab dotted raws li qhia hauv daim duab yog daim duab superimposed high-ci. Qhov zoo sib xws coupling tshwm sim yog tshwm sim los ntawm kev cuam tshuam ntawm kab kem los ntawm kab kab. Kev sib txuas siab zoo tuaj yeem txhim kho rau qee qhov los ntawm kev txo cov kab raj blanking voltage los ntawm kev tsim cov clamping voltage txoj kev, uas yog, ua kom nws nyob rau ntawm ib theem tom qab tso tawm tas. Txawm li cas los xij, txoj kev tsim no yuav ua rau muaj teeb meem xws li tsaus nti luv-circuit kab, qis grey thiab xim liab, thiab qhov loj VF qhov tseem ceeb ntawm lub teeb hlaws. Los ntawm qhov kev xav ntawm kab tsav tsheb, qhov sib txawv ntawm qhov sib txuas siab tuaj yeem txhim kho los ntawm kev txo qis qhov tsis muaj hluav taws xob, tab sis nws yuav ua rau muaj teeb meem loj rov qab hluav taws xob ntawm lub teeb hlaws thiab luv-circuit caterpillars. Tube blanking voltage xaiv Hauv cov ntsiab lus, kev xaiv ntawm cov kab raj blanking voltage ntsib cov teeb meem ntawm saum toj no rau rau qhov teeb meem loj, thiab muaj qee qhov kev sib tw, thiab qhov blanking voltage tsis tuaj yeem siab dhau lossis qis dhau. Feem ntau qhib crosses raug tshem tawm los ntawm kev tshawb nrhiav qhov tsav tam sim no, vim tias qhov hluav taws xob qis dhau yuav txo qhov kev ntseeg tau ntawm lub teeb hlaws rau kev siv mus ntev. Cov lus hauv qab no qhia txog qhov tsim nyog ntawm blanking voltage hauv ntau qhov xwm txheej. Yog li ntawd, txhawm rau daws cov teeb meem ntawm daim ntawv thov ntau yam, qhov blanking voltage ntawm 3V ~ 3.4V (VCC=5V) yog qhov kev xaiv tsim nyog dua. Nws tuaj yeem ua tau raws li qhov tsim qauv xav tau ntawm ntau lub scanning modules ntawm cov neeg siv, kom thiaj li daws tau ntau yam teeb meem ntawm daim ntawv thov.
