GIA(Gate Driver in Array)技術(shù), 使用GIA電路取代Gate IC, 將Gate IC和Source IC進行整合。只需要Source driver IC即可驅(qū)動Panel。
TFT panel驅(qū)動架構(gòu)介紹
TFT驅(qū)動系統(tǒng)三部分:Timing controller,Source driver,Gate driver;
Tcon:Timing controller 時序控制,接受顯示主控芯片的LVDS數(shù)據(jù),控制gate driver IC 和 source driver IC實際驅(qū)動LCD panel;
Gamma reference voltages:Gamma參考電壓 ,gamma產(chǎn)生的V0~V10作為基準電壓,Source Driver IC內(nèi)部繼續(xù)分壓產(chǎn)生64階灰度reference voltages;
Vcom reference voltage:Vcom 參考電壓
Column Drivers:列驅(qū)動器(Source Driver 驅(qū)動器)
Row Drivers:行驅(qū)動器(Gate Driver 驅(qū)動器)
DC/DC converter:直流轉(zhuǎn)換電源,提供 Gate Driver IC, Gamma,Source driver需要的正負高電壓,數(shù)字工作電壓
功能介紹:
Timing controller:
(a)通過控制信號,協(xié)同Source driver,Gate driver按照正確的時序工作,驅(qū)動面板;
(b)數(shù)據(jù)信號的輸入并做相應(yīng)處理后傳輸?shù)絪ource driver;
(c)內(nèi)嵌基本圖像處理算法(FRC,Over Drive,BFI,Color Engine,Gamma Correction)等;
Source driver:
接受Timing controller的控制信號(Pol,TP,STH),將輸入數(shù)據(jù)信號轉(zhuǎn)換成電壓輸出,配合TFT的開關(guān),對面板的像素電極進行充電;
Gate driver:
接受Timing controller的控制信號(OE,STV,CPV),按照正確的時序循環(huán)輸出開關(guān)電壓給TFT 柵極,控制TFT的開關(guān);
Gate IC 介紹
Gate Drive IC用來掃描每一行的 TFT,將其打開來顯示該行的圖像
整合型顯示驅(qū)動單芯片方案,One Chip Solution
隨著面板制造技術(shù)的進步,以及市場需求的推動,面板廠逐步引入GIA(Gate Driver in Array)技術(shù), 使用GIA電路取代Gate IC, 將Gate IC和Source IC進行整合。
傳統(tǒng)TFT-LCD面板Gate線路采用配線從驅(qū)動芯片導(dǎo)入信號使TFT開啟,將顯示信號輸入到像素單元完成畫面顯示。由于每一條配線對應(yīng)一行Gate電路,配線條數(shù)較多,占用空間較大。為對應(yīng)窄邊框和高解析度產(chǎn)品需求,集成柵極驅(qū)動電路(GIA, Gate Driver in Array)技術(shù)應(yīng)運而生。GIA即在TFT玻璃上通過用MOSFET所搭建的電路,給每行設(shè)計一組GIA電路,僅輸入少量GIA Timing信號,可輸出多路Gate控制信號,從而替代Gate Driver IC的功能。目前GIA方案已廣泛應(yīng)用在智能手機、平板電腦等主流顯示市場,促進了智能手機、平板電腦等領(lǐng)域整合型顯示驅(qū)動芯片的發(fā)展。
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