基础液晶显示器驱动原理优秀课件.ppt

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1、基础液晶显示器驱动原理第1页，本讲稿共42页2023/5/121Write by Hersing YangTypes of Liquid Crystal第2页，本讲稿共42页2023/5/122Write by Hersing YangLiquid Crystal PhasesNematic PhasesSmectic PhasesIsotropic PhasesCrystalline PhasesTemperature第3页，本讲稿共42页2023/5/123Write by Hersing YangOptical characteristic of Liquid Crystal N1N2N

2、1 N2N1=Nparallel=NextraordinaryN2=Nperpendicular=NordinaryOptical Anisotropy:Birefringence N=Nparallel-NperpendicularPositive Birefringence N1N2Positive Liquid Crystal parallelperpendicular第4页，本讲稿共42页2023/5/124Write by Hersing YangOperation Theory of TNTwist 90液晶分子Field OFFField ON利用液晶的旋光特性調變穿透光線液晶的

3、旋光特性消失第5页，本讲稿共42页2023/5/125Write by Hersing YangOperation Theory of STNTwist 270液晶分子Field OFFField ON利用液晶的雙折射特性調變穿透光線第6页，本讲稿共42页2023/5/126Write by Hersing YangV-T Curve of TN/STN100%90%10%VnsSTN VsSTNVsTNVnsTNTV第7页，本讲稿共42页2023/5/127Write by Hersing YangThe Structure of Simple/Active MatrixDrive Syst

4、emsSimpleActive第8页，本讲稿共42页2023/5/128Write by Hersing YangThe Evolution of Driving Systems直接驅動法(Direct Addressing)靜態驅動法(Static Addressing)多工驅動法(Multiplex Addressing)主動驅動法(Active Addressing/Multi-Line Selection)主動矩陣驅動法(Active Matrix Addressing)兩端元件(MIM,Diode.)三端元件(A-Si:H TFT,Ploy-Si TFT.)Plasma Addres

5、sing(PALC)熱掃描驅動法(雷射掃描)光掃描驅動法(電子速掃描)第9页，本讲稿共42页2023/5/129Write by Hersing YangLCD Direct Drive Techniques第10页，本讲稿共42页2023/5/1210Write by Hersing Yang多工驅動法(振幅選擇驅動法,APT)1 2 3 4N 1 2 3Frame 1Frame 2F0DT水平掃描訊號+D-D0垂直影像訊號Row 1Row 2Row 3Row NColumn 1ONOFFONOFFF+DF-DF+DF-D+D-D0+D-D0+D-D0+D-D01 2 3 4NFrame 1

6、液晶畫素電壓T第11页，本讲稿共42页2023/5/1211Write by Hersing Yang多工驅動法的限制1.01.11.21.3100200第12页，本讲稿共42页2023/5/1212Write by Hersing YangIAPT 驅動波形第13页，本讲稿共42页2023/5/1213Write by Hersing Yang主動驅動法(Active Addressing)R1(t)R2(t)R3(t)Rn(t)C1(t)R1(t),R2(t),.Rn(t)是一組兩兩正交的向量函數 第14页，本讲稿共42页2023/5/1214Write by Hersing YangMu

7、ltiple Line Selection STNFor the purpose of driving the fast responding STN LCDs without decreasing contrastMLS Required 3-Level Row Driver and(L+1)levels Column Driver.L=Row Selections at time第15页，本讲稿共42页2023/5/1215Write by Hersing Yang4-Line SelectionV4V3V2V5V1Column Wave form第16页，本讲稿共42页2023/5/12

8、16Write by Hersing YangInverse Row Function1 Frame1 Sub-FrameTimeRow 1Row 2Row 3Row 4Row 5Row 6第17页，本讲稿共42页2023/5/1217Write by Hersing Yang2-Levels MLS with Dummy RowSUM第18页，本讲稿共42页2023/5/1218Write by Hersing Yang2-Levels MLS Waveform第19页，本讲稿共42页2023/5/1219Write by Hersing Yang2-Levels MLS Gray Shad

9、eI II III IV第20页，本讲稿共42页2023/5/1220Write by Hersing YangBlock Diagram of MLS ControllerFRCControlWriteAddressReadAddressRowFunctionAddressMultiplexerDataI/OXORand SumTimingControlRGB DataHS/VS/CLKROWDriverColumnDriver第21页，本讲稿共42页2023/5/1221Write by Hersing YangMLS 主要公式N =Total Row NumberL =Rows of S

10、election at one timeVr=Scan VoltageVi=the i-th Data Voltage第22页，本讲稿共42页2023/5/1222Write by Hersing YangMLS矩陣運算Y=4Y=2Y=0Y=-2Y=-4Vm-Vc+VcColumn Wave form+Vr-VrVmA=1A=-1Row Wave form第23页，本讲稿共42页2023/5/1223Write by Hersing YangColumn Voltage LUT第24页，本讲稿共42页2023/5/1224Write by Hersing Yang高容量多工驅動的對策(a)(b

11、)(c)(d)(e)第25页，本讲稿共42页2023/5/1225Write by Hersing Yang=/(Bias Ratio)STN 規格第26页，本讲稿共42页2023/5/1226Write by Hersing YangSTN LCDs 驅動電壓計算(APT/IAPT)If Voff=2V,N=240 rows,Then:APT:Segment Driver:2.96V,Common Driver:44.40VIAPT:Segment&Common Drivers:23.68V第27页，本讲稿共42页2023/5/1227Write by Hersing YangSTN LCD

12、s 驅動電壓計算(MLS)If Voff=2V,N=240 rows,Then:Vo=2.9244VVr=11.326VData Driver最大輸出電壓=2Vo=5.8488VScan Driver最大輸出電壓=2Vr=22.652V第28页，本讲稿共42页2023/5/1228Write by Hersing YangSimple Matrix Drive Circuit第29页，本讲稿共42页2023/5/1229Write by Hersing YangSimple Matrix Common Drive Circuit第30页，本讲稿共42页2023/5/1230Write by H

13、ersing YangSimple Matrix Segment Drive Circuit第31页，本讲稿共42页2023/5/1231Write by Hersing Yang液晶的頻率響應第32页，本讲稿共42页2023/5/1232Write by Hersing YangVertical Crosstalk of STN LCDs第33页，本讲稿共42页2023/5/1233Write by Hersing YangVertical Crosstalk 的抑制每兩條水平線變換一次驅動電壓極性第34页，本讲稿共42页2023/5/1234Write by Hersing YangHor

14、izontal Crosstalk of STN LCDs垂直驅動訊號L Line水平掃描波形液晶畫素波形(a)(b)(c)(d)ABABL第35页，本讲稿共42页2023/5/1235Write by Hersing YangHorizontal Crosstalk 的抑制垂直驅動訊號L Line水平掃描波形液晶畫素波形(a)(b)(c)(d)傳統驅動方式水平掃描補償波形補償之液晶畫素波形(e)(f)GVLAB第36页，本讲稿共42页2023/5/1236Write by Hersing YangSTN 矩陣運算方式行（Row）行向量（Row）列向量（Column）Bit-Map Image

15、 MatrixRow Vector時間（Time）列（Column）Time=Dtk行向量（Row）列向量（Column）第j列Row Function Matrix時間（Time）列（Column）Column Vector垂直序列運算Column Sequential時間序列運算Time Sequential第37页，本讲稿共42页2023/5/1237Write by Hersing YangColumn Sequential 硬體架構 NM圖框記憶體 NM圖框記憶體影像資訊輸入IjNXOR陣列N加法邏輯陣列NM STN LCDs液晶層間隙4.5um液晶材料：低黏滯係數水平驅動函數唯讀記

16、憶體Row Function ROMNSTN LCDs垂直驅動晶片TFT LCDs 垂直驅動晶片1轉2多工器2轉1解多工器第38页，本讲稿共42页2023/5/1238Write by Hersing YangTime Sequential 硬體架構 NM圖框記憶體 NM圖框記憶體影像資訊輸入IjNXOR陣列N加法邏輯陣列水平驅動函數唯讀記憶體Row Function ROMN1轉2多工器2轉1解多工器NM圖框緩衝記憶體NM圖框緩衝記憶體NM STN LCDs液晶層間隙4.5um液晶材料：低黏滯係數STN LCDs垂直驅動晶片TFT LCDs 垂直驅動晶片N第39页，本讲稿共42页2023/5

17、/1239Write by Hersing YangFrame Rate ControlColor transition of FRC in Two EPSON ECB Module 第40页，本讲稿共42页2023/5/1240Write by Hersing YangPassive Bias GenerationLCD load is capacitive,the current during element charging and discharging distorts the waveform.Generally,the value of resistor R is 1 kW to

18、 10 kW.Lower resistor values reduce distortion but increase power dissipation.Larger LCD panels exhibit greater capacitance.Connecting a capacitor in parallel to the resistors can reduce waveform distortion.Larger capacitor values generate a voltage level shift and reduce the operating margin.第41页，本讲稿共42页2023/5/1241Write by Hersing YangActive Bias Generation第42页，本讲稿共42页2023/5/1242Write by Hersing Yang