《基础液晶显示器驱动原理》由会员分享，可在线阅读，更多相关《基础液晶显示器驱动原理（42页珍藏版）》请在金锄头文库上搜索。
1、基礎液晶顯示器驅動原理Topic 液晶分類 液晶光電特性 STN 液晶顯示原理 APT 矩陣驅動原理 MLS 矩陣驅動原理2018/6/141Write by Hersing YangTypes of Liquid CrystalDate2Write by Hersing YangLiquid Crystal PhasesNematic PhasesSmectic PhasesIsotropic PhasesCrystalline PhasesTemperatureDate3Write by Hersing YangOptical characteristic of Liquid Crysta
2、l N1N2N1 N2N1 = Nparallel = NextraordinaryN2 = Nperpendicular = NordinaryOptical Anisotropy : Birefringence N=Nparallel-Nperpendicular Positive BirefringenceN1N2 Positive Liquid CrystalparallelperpendicularDate4Write 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
3、晶的旋光特性消失Date5Write 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Date6Write by Hersing YangV-T Curve of TN / STN100%90%10%Vns STNVs STNVs TNVns TNTVDate7Write by Hersing YangThe Structure of Simple/Active Matrix Drive SystemsSimpleActiveDate8Write by Hersing Ya
4、ngThe 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 Addressing (PALC) 熱掃描驅動法 (雷射掃描) 光掃描驅動法 (電子速掃
5、描)Date9Write by Hersing YangLCD Direct Drive TechniquesDate10Write 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液晶畫素電壓TDate11Write by Hersing Yang多工驅動法的限制1.01.11.
6、21.3100200Date12Write by Hersing YangIAPT 驅動波形Date13Write 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 Date14Write by Hersing YangMultiple Line Selection STNFor the purpose of driving the fast responding STN LCDs without decreasing contrast ML
7、S Required 3-Level Row Driver and (L+1) levels Column Driver. L= Row Selections at timeDate15Write by Hersing Yang4-Line SelectionV4 V3 V2 V5 V1Column Wave formDate16Write by Hersing YangInverse Row Function1 Frame1 Sub-FrameTimeRow 1Row 2Row 3Row 4Row 5Row 6Date17Write by Hersing Yang2-Levels MLS w
8、ith Dummy RowSUMDate18Write by Hersing Yang2-Levels MLS WaveformDate19Write by Hersing Yang2-Levels MLS Gray ShadeI II III IVDate20Write by Hersing YangBlock Diagram of MLS ControllerFRC ControlWrite AddressRead AddressRow FunctionAddress MultiplexerData I/O256K Bit SRAM256K Bit SRAMXOR and SumTimin
9、g Control RGB DataHS/VS/CLKROW DriverColumn DriverDate21Write by Hersing YangMLS 主要公式N = Total Row Number L = Rows of Selection at one time Vr = Scan Voltage Vi = the i-th Data VoltageDate22Write by Hersing YangMLS矩陣運算Y= 4 Y= 2 Y= 0 Y=-2 Y=-4Vm-Vc+VcColumn Wave form+Vr-VrVmA= 1A= -1Row Wave formDate
10、23Write by Hersing YangColumn Voltage LUTDate24Write by Hersing Yang高容量多工驅動的對策(a)(b)(c)(d)(e)Date25Write by Hersing Yang= /(Bias Ratio)STN 規格Date26Write 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 : 44.40V IAPT : Segment & Common
11、 Drivers : 23.68VDate27Write by Hersing YangSTN LCDs 驅動電壓計算(MLS)If Voff=2V, N=240 rows, Then : Vo=2.9244V Vr=11.326V Data Driver最大輸出電壓=2Vo=5.8488V Scan Driver最大輸出電壓=2Vr=22.652VDate28Write by Hersing YangSimple Matrix Drive CircuitDate29Write by Hersing YangSimple Matrix Common Drive CircuitDate30Wri
12、te by Hersing YangSimple Matrix Segment Drive CircuitDate31Write by Hersing Yang液晶的頻率響應Date32Write by Hersing YangVertical Crosstalk of STN LCDsDate33Write by Hersing YangVertical Crosstalk 的抑制每兩條水平線變換一次驅動電壓極性Date34Write by Hersing YangHorizontal 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
13、)(d)ABABLDate35Write 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)GVLABDate36Write by Hersing YangSTN 矩陣運算方式行（Row）行向量（Row）列向量（Column）Bit-Map Image 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（T
14、ime）列（Column）Column Vector垂直序列運算 Column Sequential時間序列運算 Time SequentialDate37Write 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Date38Write by Hersing YangTim
15、e 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NDate39Write by Hersing YangFrame Rate ControlColor transition of FRC in Two EPSON ECB Module Date40Write by Hersi
16、ng 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 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 distortio
