Ingancin nunin nunin LED ya kasance yana da alaƙa da kusanci da guntu na yau da kullun na yanzu, kamar fatalwa, giciye pixel giciye, ƙaramin simintin launin toka, duban farko mai duhu, babban haɗin haɗin gwiwa, da sauransu, kuma layin layin koyaushe ya kasance mai sauƙi. buƙatun dubawa.Da yawa hankali.Tare da haɓakar ƙaramin farar, nunin nunin LED kuma yana gabatar da buƙatu masu girma don tuki a layi, daga tsantsar P-MOSFET don gane jujjuyawar layi, zuwa babban haɗin kai da ƙarin tuƙi mai aiki da yawa.Zane-zane da zaɓin direbobin layi suma suna fuskantar manyan ƙalubale guda shida kamar kawar da fatalwa, fitila mai jujjuya wutar lantarki, gajeriyar katapila, buɗaɗɗen giciye, ƙimar fitilar fitilar VF tana da girma da yawa, da babban haɗin gwiwa.
Fatalwa
Lokacin da aka kunna allon dubawa, yana ɗaukar ɗan lokaci don kunnawa da kashe na'urar PMOS da kuma fitar da caji akan ma'auni na parasitic capacitance Cr na layin layi.Sabili da haka, a lokacin da aka kunna VLED da OUT a cikin layi na gaba, cajin da ba a saki ba na VLED a layin da ya gabata shine Hanyar gudanarwa.Lokacin da aka kunna Row(n), ana cajin layin parasitic capacitance Cr zuwa yuwuwar VCC.Lokacin canzawa zuwa Row(n+1), akwai yuwuwar bambanci tsakanin Cr da OUT, kuma ana fitar da cajin ta cikin bead ɗin fitila, wanda ke haifar da hasken LED mai duhu.
Don haka, ana buƙatar cire cajin akan Cr a gaba a lokacin canjin layi.Gabaɗaya, bututun layi tare da haɗaɗɗun aikin blanking na iya saurin fitar da cajin capacitor na parasitic Cr lokacin da ake canzawa ta ƙara da'ira mai saukarwa.Ƙarƙashin yuwuwar cirewa, wato, ƙananan ƙarancin wutar lantarki VH, da sauri za a sauke cajin akan ƙarfin ƙarfin parasitic, kuma mafi kyawun tasirin kawar da hotunan fatalwa.Gabaɗaya, VH Lamp bead mai juyawa ƙarfin lantarki
Juya ƙarfin wutar lantarki na bead ɗin fitila yana tasiri sosai ga rayuwar sabis na bead ɗin fitila.Matattun pixels da aka haifar da matsa lamba na baya sun kasance koyaushe wuraren zafi na nunin LED, musamman ma ƙaramin sauti.
Lokacin da tashar fitarwa ta rufe, za a ci gaba da cajin ƙarfin ƙarfin parasitic a tashar saboda tasirin motsa jiki na parasitic inductance, yana haifar da glitch mai girma sosai.A wannan lokacin, yana samar da wutar lantarki mai juyi da aka ɗora a kan fitilun fitila tare da fitowar bututun layin, don haka ƙarancin wutar lantarki na bututun layin yana rinjayar jujjuyawar wutar fitilar a lokaci guda.Lokacin da wutar lantarki a akai-akai fitarwa tashar da aka gyara, mafi girma blanking irin ƙarfin lantarki na layin bututu, da karami da baya irin ƙarfin lantarki na fitilar dutsen dutse.Yawanci ƙananan ƙarfin juzu'i na bead ɗin fitilar shine 5V.A zahiri wanda masana'anta suka gwada, matsawar baya da ke ƙasa da 1.4V na iya rage matattun pixels da matsin baya ke haifarwa.Don haka, ƙarancin wutan lantarki ba zai iya zama ƙasa da ƙasa don matsalar matsa lamba na bead ɗin fitila ba.Ba ƙasa da VCC-2V ba.
Short circuit caterpillar
Lokacin da LED ɗin ya kasance gajere, za a sami wani dogon yanayi mai haske, wanda gabaɗaya ake kira caterpillar short-circuit.Lokacin da bead ɗin fitilun LED a tsakiya ya gajere, bead ɗin fitilar LED ɗin da ke cikin ginshiƙi ɗaya zai samar da hanya kamar yadda aka nuna a cikin hoton da ke ƙasa lokacin da ake dubawa zuwa jere.Idan bambancin matsa lamba tsakanin VLED da aya A ya fi darajar hasken fitilar fitilar LED, za a kafa ginshiƙi na al'ada.Haske mai haske.
Babban bambanci tsakanin katapillar gajeriyar kewayawa da buɗaɗɗen giciye shi ne, muddin allon yana cikin yanayin dubawa, ɗan gajeren zangon caterpillar zai bayyana ba tare da la'akari da ko fitilar fitilar LED ta nuna hoto ba, da kuma caterpillar mai buɗewa. zai sami matsalar giciye kawai lokacin da buɗaɗɗen fitilar fitilar ta kunna.Yawanci ta hanyar haɓaka bututun mai ba da wutar lantarki, bambancin wutar lantarki ya ƙanƙanta da ƙarfin wutar lantarki na gaba na LED VF, wato, VLED-VHVCC-1.4V na iya magance matsalar caterpillar short-circuit.Lokacin da VCC-2V