Zopangira zoyendetsa zowonetsera za LED zimaphatikizanso tchipisi ta driver scan ndi column driver tchipisi, ndipo magawo awo ogwiritsira ntchito ndiwo makamakazowonetsera zakunja zotsatsa za LED,mawonekedwe a LED mkati ndi mawonekedwe a mabasi a LED. Kuchokera pamawonekedwe amtundu wowonetsera, chimakwirira chiwonetsero cha LED cha monochrome, chiwonetsero chamitundu iwiri cha LED ndi chiwonetsero chamitundu yonse ya LED.
Mu ntchito yowonetsera mtundu wamtundu wa LED, ntchito ya dalaivala IC ndiyo kulandira deta yowonetsera (kuchokera pa khadi lolandira kapena pulosesa ya kanema ndi zina zambiri) zomwe zimagwirizana ndi ndondomekoyi, kupanga mkati mwa PWM ndi kusintha kwa nthawi yamakono, ndi tsitsimutsani zotulutsa ndi kuwala kwa grayscale. ndi mafunde ena okhudzana ndi PWM kuti aziwunikira ma LED. IC yozungulira yopangidwa ndi driver IC, logic IC ndi MOS switch imagwira ntchito limodzi pamawonekedwe otsogola ndikusankha mawonekedwe omwe akuwonetsa.
Tchipisi zoyendetsa ma LED zitha kugawidwa kukhala tchipisi tolinga wamba ndi tchipisi tacholinga chapadera.
Chip cha cholinga chambiri, chipchocho sichinapangidwe mwapadera kuti chikhale ndi ma LED, koma tchipisi tamalingaliro (monga ma serial 2-parallel shift registers) okhala ndi ntchito zina zomveka zowonetsera motsogozedwa.
Chip chapadera chimatanthawuza chip dalaivala chomwe chimapangidwira mwapadera chiwonetsero cha LED molingana ndi mawonekedwe owala a LED. LED ndi chipangizo chamakono chamakono, ndiko kuti, pansi pa chikhalidwe cha machulukitsidwe conduction, kuwala kwake kumasintha ndi kusintha kwamakono, osati kusintha magetsi kudutsa. Chifukwa chake, chimodzi mwazinthu zazikulu za chip chodzipatulira ndikupereka gwero lanthawi zonse. Gwero lomwe lilipo nthawi zonse limatha kutsimikizira kuyendetsa kokhazikika kwa LED ndikuchotsa kuthwanima kwa LED, zomwe ndizofunikira kuti chiwonetsero cha LED chiwonetse zithunzi zapamwamba. Tchipisi zina zacholinga chapadera zimawonjezeranso ntchito zina zapadera pazofunikira zamafakitale osiyanasiyana, monga kuzindikira zolakwika za LED, kuwongolera kupindula kwapano komanso kukonza kwapano.
Kusintha kwa driver ICs
M'zaka za m'ma 1990, mawonekedwe a LED ankayang'aniridwa ndi mtundu umodzi ndi wapawiri, ndipo ma IC oyendetsa magetsi nthawi zonse ankagwiritsidwa ntchito. Mu 1997, dziko langa lidawonekera choyamba chodzipatulira chowongolera chip 9701 cha chiwonetsero cha LED, chomwe chidachokera ku 16-level grayscale mpaka 8192-level grayscale, ndikuzindikira WYSIWYG ya kanema. Pambuyo pake, poyang'ana mawonekedwe otulutsa kuwala kwa LED, dalaivala wanthawi zonse wakhala chisankho choyamba kwa woyendetsa wamtundu wamtundu wa LED, ndipo dalaivala wa 16-channel wokhala ndi kuphatikiza kwakukulu walowa m'malo oyendetsa 8-channel. Chakumapeto kwa zaka za m'ma 1990, makampani monga Toshiba ku Japan, Allegro ndi Ti ku United States anayambitsa motsatizanatsatizana tchipisi ta madalaivala amakono 16 a LED. Masiku ano, pofuna kuthetsa PCB mawaya vuto lamawonekedwe ang'onoang'ono a LED, opanga ena oyendetsa ma IC ayambitsa zida zophatikizika kwambiri za 48-channel LED yokhazikika pakali pano.
Zizindikiro zamachitidwe a driver IC
Pakati pa zisonyezo zowonetsera ma LED, kutsitsimula, kuchuluka kwa imvi ndi kufotokozera kwazithunzi ndi chimodzi mwazinthu zofunika kwambiri. Izi zimafuna kusasinthasintha kwakukulu kwamakono pakati pa ma LED owonetsera oyendetsa IC njira, mawonekedwe othamanga kwambiri komanso kuthamanga kwanthawi zonse. M'mbuyomu, kuchuluka kwa zotsitsimutsa, kuchuluka kwa imvi ndi kagwiritsidwe ntchito kunali mgwirizano wamalonda. Kuti muwonetsetse kuti chizindikiro chimodzi kapena ziwiri zitha kukhala zabwinoko, ndikofunikira kupereka nsembe ziwiri zotsalazo. Pachifukwa ichi, ndizovuta kuti zowonetsera zambiri za LED zikhale ndi zabwino kwambiri padziko lonse lapansi pazogwiritsa ntchito. Kaya mlingo wotsitsimula siwokwanira, ndipo mizere yakuda imakonda kuwonekera pansi pa zipangizo zamakina othamanga kwambiri, kapena grayscale sikokwanira, ndipo mtundu ndi kuwala sizikugwirizana. Ndi kupita patsogolo kwaukadaulo wa opanga ma driver IC, pakhala zopambana pamavuto atatu akulu, ndipo mavutowa atha. Pakadali pano, zowonetsera zambiri za SRYLED LED zili ndi kutsitsimula kwakukulu ndi 3840Hz, ndipo palibe mizere yakuda yomwe idzawonekere mukajambula ndi zida za kamera.
Zomwe zikuchitika mu driver ICs
1. Kupulumutsa mphamvu. Kupulumutsa mphamvu ndiye kufunafuna kosatha kwa chiwonetsero cha LED, komanso ndichinthu chofunikira kwambiri pakuganizira momwe driver IC amagwirira ntchito. Kupulumutsa mphamvu kwa woyendetsa IC makamaka kumaphatikizapo mbali ziwiri. Chimodzi ndicho kuchepetsa mphamvu yamagetsi yamagetsi yanthawi zonse, potero kuchepetsa mphamvu yamagetsi ya 5V kuti igwire ntchito pansi pa 3.8V; ina ndikuchepetsa mphamvu yamagetsi yoyendetsera ntchito komanso momwe dalaivala wa IC amagwirira ntchito pokonza ma algorithm ndi kapangidwe ka IC. Pakadali pano, opanga ena adayambitsa dalaivala wanthawi zonse IC wokhala ndi voliyumu yotsika ya 0.2V, yomwe imathandizira kuchuluka kwa magwiritsidwe a LED ndi 15%. Magetsi amagetsi ndi 16% otsika kuposa azinthu wamba kuti achepetse kutentha, kotero kuti mphamvu zowonetsera za LED zikuyenda bwino kwambiri.
2. Kuphatikiza. Ndi kuchepa kwachangu kwa pixel pitch ya chiwonetsero cha LED, zida zopakidwa kuti zikhazikike pagawo la unit zikuwonjezeka ndi ma multiples a geometric, zomwe zimakulitsa kwambiri kachulukidwe kagawo ka gawo loyendetsa galimoto. KutengaP1.9 yaing'ono phula LED Screen mwachitsanzo, 15-scan 160 * 90 module imafuna 180 nthawi zonse madalaivala ICs, 45 mizere machubu, ndi 2 138s. Ndi zida zambiri, malo opangira ma waya omwe amapezeka pa PCB amakhala odzaza kwambiri, zomwe zimawonjezera zovuta kupanga dera. Panthawi imodzimodziyo, makonzedwe ochuluka a zigawozi angayambitse mosavuta mavuto monga soldering osauka, komanso kuchepetsa kudalirika kwa module. Ma IC oyendetsa ochepa amagwiritsidwa ntchito, ndipo PCB ili ndi malo okulirapo. Kufunika kwa mbali yofunsira kumakakamiza woyendetsa IC kuti ayambe njira yaukadaulo yophatikizika kwambiri.
Pakadali pano, oyendetsa madalaivala a IC pamsika akhazikitsa motsatizana ma ICs oyendetsa ma 48-channel LED omwe amayendetsa madalaivala, omwe amaphatikiza mabwalo akulu am'mphepete mwa IC wafer yoyendetsa, yomwe ingachepetse zovuta zamapangidwe a board a PCB. . Imapewanso mavuto omwe amadza chifukwa cha luso la mapangidwe kapena kusiyana kwa mapangidwe a mainjiniya ochokera kwa opanga osiyanasiyana.
Nthawi yotumiza: Mar-03-2022
