TFT-LCD基本原理

按一下以編輯母片標題樣式,按一下以編輯母片,第二層,第三層,第四層,第五層,*,*,*,TFT-LCD,基本原理,与设计,课程大纲,TFT-LCD,簡介,液晶的光,电,特性,TFT,LCDs,A/C,架,构,TFT,LCDs,模組架,构,TFT-LCD,驱动,原理,Driving method,Driving waveform,电容效应,TFT-LCD,设计,主,动,矩,阵,式液晶,显,示器,AM-,LCDs,Monitor System,LCD Timing,Controller,LCD,Panel,Data Driver,Scan Driver,RGB Digital Data,GMA1GMA18,18,18,Power,Supply,Circuit,Backlight,Power,Supply,Backlight,R5:0,G5:0,B5:0,Hs,Vs,CLK,DE,+5V,GND,Data & Scan Driver,Power Supply,Data Drivers,Control Signals,PC Interface,PC,R,G,B,Hs,Vs,TFT-LCD Module,PC,GMA1GMA18,4,A/D,Interface,or,Digital,Interface,Scan Control,Signals,主,动,矩,阵,式液晶,显,示器,AM-,LCDs,Panel Structure,主,动,矩,阵,式液晶,显,示器,AM-,LCDs,Panel Structure,主,动,矩,阵,式液晶,显,示器,AM-,LCDs,Panel Structure,主,动,矩,阵,式液晶,显,示器,AM-,LCDs,Panel Structure,Clc,TFT Substrate,Color Filter Substrate,R,G,B,Clc,Clc,R,B,G,主,动,矩,阵,式液晶,显,示器,AM-,LCDs,Panel Structure,TN,型,LCDs,显,示原理,TN,Mode,LCDs,Field ON,入射光,偏光板,液晶分子,玻璃基板,出射光之,极,化,状态,解偏板,出射光,未加,电场,OFF,状态,TN & STN,电,光,转移,曲,线,V,-T Curve,100%,90%,10%,Vns,STN,Vs,STN,Vs,TN,Vns,TN,V,In-Plane-Switch Mode,LCDs,偏光,板,解偏,板,液晶分子,作用,电极,玻璃基板,入射光,作用,电场,方向,出射光之,极化状态,未加,电场,“,OFF,”,状态,施加,电场,“,ON,”,状态,出射光,Vertical Alignment Mode,LCDs,未加,电场,OFF,状态,施加,电场,ON,状态,入射光,偏光板,液晶分子,玻璃基板,出射光之,极化,狀,态,解偏板,出射光,Comparison of LC Modes,Strongly dependent,on viewing angle,低,驱动电压,視角窄小,Off(White,),On(Black,),Slightly dependent,on viewing angle,广视角,液晶,反应速度慢,Off(Black,),On(White,),画面对比低,画面品质差,Slightly dependent,on viewing angle,画面对比,高,广,視角,Off(Black,),On(White,),液晶,反应速度,快,彩色,画面显像,佳,TN,IPS,VA,主,动,矩,阵,式液晶,显,示器,AM-,LCDs,Panel Structure,TFT-LCD Module,TTL,LVDS,Panel Link,Singal,Controller,DC/DC,Dirver,IC,invertor,TFT-LCD,BL,X-PCD,YPCB,Gamma,Gen.,Component,EMI,TFT Characteristic,Id,10,20,Vg,10,E-6,10,E-11,10,E-12,-5,-10,TFT,LCDs,等效,电,路,Row Drivers,Column Driver,1,H,1,H,Clc,Cs,Cs,Cs,Cs,Cs,Cs,Cs,Cs,Cs,Clc,Clc,Clc,Clc,Clc,Clc,Clc,Clc,Timing Chart of TFT,LCDs,Frame Time,Gate,1,2,3,N,1,H,L1,L2,L3,DATA,TFT,LCDs,Driving Method,Column Inversion,Dot Inversion,Row Inversion,Frame Inversion,Direct Driving of TFT,LCDs,DC Bias,of Common,GrayScale,Voltage,V0,V1,V2,V62,V63,V63,V62,V2,V1,V0,1,Frame / 1 Line,AC Modulation Addressing of TFT,LCDs,V0,V1,V2,V62,V63,V63,V62,V2,V1,V0,Common Waveform,Graylevel,Voltage,1,Frame / 1 Line,TFT,LCDs,的,电,光效,应,Direct Addressing,TFT,LCDs,的,电,光效,应,AC Addressing,Pixel Structure of TFT,LCDs,Clc,Cs,Clc,Cs,Common,Common,(,N-1)th,Scan Line,(,N-1)th,Scan Line,Nth Scan,Line,Nth Scan,Line,Cs on Common Mode,Cs on Gate Mode,Cgd,Cgd,液晶,电,容,儲存,电,容,扫,描,电极,资,料,电极,共通,电,極,Mth,Data Line,Mth,Data Line,资,料,电极,扫,描,电极,:,Clc,:,Cs,:,Common,:,Cgd,寄生,电,容,液晶,画,素,电,容:,Clc+Cs,Cs on Common,与,Cs on Gate,液晶,画素,TFT,Gate Line,Data Line,Cs,Cs,液晶,画素,TFT,Common,Common,Gate Line,Data Line,Cs,Cs,Cs on,Common,Cs on,Gate,TFT,LCDs,Driving Waveform Cs on Common(,一),TFT LCD,驱动,波形,(,Cs on Common, Common = DC Bias),TFT,LCDs,Driving Waveform Cs on Gate,TFT,电,容,效应,的,响应,Pixel,Cgd,Cgs,Csd,Csdb,Csdb,二階,驱动,方式的效,应,Cs,Clc,Cgd,Csd,Cgs,Vct,Ch(N-1),Ch(N,),Vs,垂直,影像,讯号,水平,扫描讯号,Vg,水平,扫描讯号,Vg,Vsh,Vsl,Vst,Vth,Vth,正,极性驱动,负极性驱动,负极性驱动,正极性驱动,资料驱动,晶片,输出讯号电,位,液晶,画素电位,Vct,=,Vst-Vp,Vp,Black(+),White(+),White(+),Black(+),Black(-),Black(-),White(-),White(-),TFT,补偿驱动,法,Ch(N-1),Ch(N,),Vst,=,Vct,影像,讯号,波形,Vs,水,平,脉,波,扫,描,波,形,Vge,Vge,Vghl,3,Level Addressing,TFT-LCD Module,设计,(一),订定,TFT-LCD Module Spec- Resolution / Power / Dimension.,Video Signal Format / Scan Line Period( Hs ) / Frame Period ( Vs ),TFT,的,I,ON,/I,OFF,电流,I,ON,必须于,一,条水平扫描线时间将,影像,电压,充入液晶,电,容(,Clc,),I,OFF,必须,使充入液晶,电容,中的影像,电容维持,一,个,Frame,的,时间,直流漂移,(,DC Offset),当,Scan Line,上,Gate,Pule,关闭时,透,过离散电,容(,Cgd,Cgs,Cds,) ,对画,素,电极,(,Pixel Electrode),所造成的,Feed through,效应.,TFT-LCD Module,设计,(二),水,平扫,描,脉线,的,RC,时间常数,高解析度,时,必,须,降低,RC,时间常数,以利液晶,电容,之充放,电,.,液晶的,电,光,转,移特性曲,线,(,V-T Curve),必,须量测,LCD Panel,正确,之,V-T Curve,以利,Gamma Correction,选择适合,的,驱动,方式(,Cs on Gate or COM),考虑,Feed Through,效应,的,补偿,及,VCOM,电压,的,调整,.,驱动,IC(Scan,& Data),的,选,取,针对,LCM,的解析度及,LCD Panel,的元件,参数选,用,Driver IC.,Control PCB,的,设计,针对,所,选,定的,Driver IC, Control PCB,提供其所,须,之控制,讯号,.,