屏原理圖介紹

1、會(huì)計(jì)學(xué)1屏原理圖介紹屏原理圖介紹LCD驅(qū)動(dòng)電路架構(gòu) Control Board + X Board + Y Board Control Board + X Board X+C Board X+C Board double scan COG GOA G0A+Dual Gate GOA + Triple GateLCD PanelLCD cellY boardControl boardXL boardXR boardCOFFFCControl Board + X Board + Y BoardLCD PanelLCD cellControl boardXL boardXR boardControl

2、 Board + X BoardLCD PanelLCD cellControl+X boardX+C(Control) BoardLCD PanelLCD cellControl+X boardX+C(Control) Board- Double scan COG( Chip On Glass )GOA( Gate On Array )LCD PanelLCD cellControl+X boardGOA + Dul gateLCD PanelLCD cellControl+X boardGOA + Triple gateGate Driver Board LVDS connectorDC-

3、DCSource Driver Board TCONOPVGHVGLVAA/VDAVcomGammaPower StructureVCC(12/5 V)VDDPower電路框架圖Note:1. Dummy pins 在應(yīng)用中可以讓其floating2. L/R, MODE1, MODE2 pins在電路內(nèi)部分別直接接到了VDD和VSSDummy pins 掃描驅(qū)動(dòng)電路示意圖 TFT LCD 邏輯緩沖放大器TFT LCD 面板STVxVEEVGHOE&/XAOCPVL/R移位寄存器單顆Gate IC電位轉(zhuǎn)移器IC1IC2IC3IC4掃描信號(hào)示意圖 without OE掃描信號(hào)示意圖 wi

4、th OEApplication diagramShift registerLogicL/R STV2 STV1OE XAOTCONDC/DCCharge PumpReset ICVDDCPVSTVX/XAOVGHVEEGate IC internalTFT 面板等效電路Shift registerShift registerShift registerShift registerLogicLogicLogicOECPV from TCONCPV to ICInput buffer走線等效電路 移位寄存器輸入輸出波形示意圖 Shift refister1Shift refister2Shift

5、 refister3Shift refister4CPVCPVSTVxShift refister1Shift refister2Shift refister3Shift refister4Shifter register1Shifter register1VDDVGHVEEVSSLSVDDVSSVSSVEEVGHLogicLS inputLS outputESD連接端子Level shifterESDLevelshifter玻璃基板連接端子緩沖放大器示意圖（以偶數(shù)級(jí)為例） 雙向移位寄存器雙向移位寄存器數(shù)據(jù)暫存器數(shù)據(jù)暫存器電位轉(zhuǎn)移器電位轉(zhuǎn)移器DACDACBufferBufferDIR(左右掃描

6、控制)TP1(閂鎖信號(hào))POL(極性反轉(zhuǎn)控制)CLK(水平方向時(shí)鐘信號(hào))數(shù)據(jù)接收器視頻信號(hào)輸入RGBTFT LCD校正參考電壓數(shù)位部分類比部分Application diagramS/RLatch 1Latch 2L/SDACBufferS/RLatch 1Latch 2L/SDACBufferS/RLatch 1Latch 2L/SDACBufferCLKDIRH sync逐一寫入第n條掃描線的數(shù)據(jù)儲(chǔ)存第n-1條掃描線的數(shù)據(jù)數(shù)據(jù)信號(hào)校正參考電壓PixelPixelPixelPixelPixelPixel第n-1條掃描線第n條掃描線Application diagramShift regist

7、er作用：經(jīng)DIR控制移位寄存器的方向，以CLK、 H sync來控制逐一開啟數(shù)據(jù) 暫存器，把顯示數(shù)據(jù)儲(chǔ)存到其中。CLK: Source IC的時(shí)鐘信號(hào)DIR：控制移位寄存器的方向H sync : 水平掃描同步信號(hào)應(yīng)用： 面板的數(shù)據(jù)線的第一條有可能在最右方也有可能在最左方，為了增加data driver的通用性，所以Shift register都設(shè)計(jì)成雙向的。DAC D5(MSB)D4D3D2D1D0(LSB)V0-V1-V63-V0+V1+V63+PolarityVoutV0-V1-V63-V0+V1+V63+D5(MSB)D4D3D2D1D0(LSB)PolarityVoutDAC架構(gòu)例圖

8、(a)改變參考電壓源(b)兩組電壓選擇External referenceV0V1V2V3V4V5V6V7V8V9R0 to R63R255 to R192R191 to R128R127 to R64R63 to R0R64 to R127R128 to R191R191 to R255DAC1DAC2DAC383DAC384decoderIC internalPCB circuitTCON board 簡(jiǎn)介(6)Latch & Level Shifter Latch作用：儲(chǔ)存一條掃描線上的數(shù)據(jù)。 Latch需要的數(shù)量：以6-bit的1024 X 768 XGA的面板為例，需要 6-

9、bit X 1024 X RGB X 2組 = 36864 個(gè) Latch。 為什么需要Latch2？ 當(dāng)?shù)趎-1行掃描線上的像素開始充電時(shí)，就可以開始把第n行掃描線上的信號(hào)存儲(chǔ)到latch1上。如果沒有Latch2，只有等第n-1行掃描線上的像素充完電后，才能開始存儲(chǔ)第n行掃描線上的數(shù)據(jù)，浪費(fèi)了時(shí)間。Analog bufferVinVddVssCloadVoutBuffer 符號(hào)圖數(shù)據(jù)傳輸模式數(shù)據(jù)傳輸模式為什么使用差分信號(hào) 在高頻率下傳輸數(shù)字?jǐn)?shù)據(jù)(0V表示邏輯0，3.3V表示邏輯1)，會(huì)產(chǎn)生很高的電磁輻射能量干擾其他電子元件的正常運(yùn)作，所以減小電壓，降低EMI，但是受到外界的干擾很大，于是使

10、用差分信號(hào)。+ -+ -+ -受外部信號(hào)干擾+ -+ -+ -發(fā)射磁場(chǎng)干擾外部差動(dòng)信號(hào)傳輸示意圖VhighVlowFRC算法LVDS數(shù)據(jù)重排系統(tǒng)時(shí)鐘BIST畫面發(fā)生器存儲(chǔ)T-CON code產(chǎn)生相關(guān)的控制信號(hào)，如POL、STV、LD相關(guān)配置寄存器一、EEPROMEEPROM作用：T-CON CODET-CON CODE包含 T-CON的Timing、ACC、FRC、OD二、SourceGateX+C boardBUCK電路Boost電路Charge pump電路boostCharge pump Charge pump GammaVCOMbuckLDOT-CONGateSourceVinVAAV

11、GHVGLVGVcomCellBUCK電路Boost電路Charge pump電路GAMMA ICEPPROM電路TVS電路TCL集團(tuán)股份有限公司TCL創(chuàng)意感動(dòng)生活謝 謝LCD PanelLCD cellY boardControl boardXL boardXR boardCOFFFCControl Board + X Board + Y BoardLCD PanelLCD cellY boardControl boardXL boardXR boardCOFFFCControl Board + X Board + Y BoardApplication diagramShift registerLogicL/R STV2 STV1OE XAOTCONDC/DCCharge PumpReset ICVDDCPVSTVX/XAOVGHVEEGate IC internalTFT 面板等效電路Shift registerShift registerShift registerShift registerLogicLogicLogicOE 移位寄存器輸入輸出波形示意圖 Shift refister1Shift refister2Shift refister3Shift refister4CPVCPVSTVxShift refister1Shift refister2Shift r