1、合肥京東方光電科技有限公司合肥京東方光電科技有限公司BOEHF 開發(fā)開發(fā)中心20102010年年 7 7月月 2222日日Driver ICDriver IC功能介紹功能介紹-2-I.I.Theorem of TFT LCD Gate DriverTheorem of TFT LCD Gate DriverII.II.Theorem of TFT LCD Source DriverTheorem of TFT LCD Source Driver內(nèi)容內(nèi)容-3-Theorem of TFT LCD Gate DriverTheorem of TFT LCD Gate DrivernGate Dri

2、ver StructureGate Driver StructurenGate Driver SchematicGate Driver SchematicnShift registerShift registernLevel ShiftLevel Shift-4-Gate Driver StructureGate Driver Structure根據(jù)根據(jù)Start Pulse(STV1Start Pulse(STV1或或STV2)STV2)和輸入時(shí)鐘信號和輸入時(shí)鐘信號CPV, CPV, 通過通過Shift RegisterShift Register和和Level ShifterLevel S

3、hifter依次以依次以1 1個(gè)水平周期輸出個(gè)水平周期輸出VGHVGH電壓，電壓， 其他時(shí)間則輸出其他時(shí)間則輸出VGLVGL電壓。電壓。-5- Gate Driver主要的輸入輸出信號：InputCLKShift Register用的Clock信號在上升沿時(shí)輸入數(shù)據(jù)（STVR, STVL）進(jìn)行Shift。OEGate Driver的輸出Enable/Disable控制信號R/LShift Register的Shift方向切換信號Ex./R/L=High Level Input: STVR, Output: STVL STVR-G1-G2.-Gn-STVL R/L=High Level Inpu

4、t: STVL, Output: STVR STVL-Gn-.-G2-G1-STVRInput/OutputSTVR,STVLShift Register的輸入信號，輸入時(shí)，在CLK的上升沿讀入。作為機(jī)能為表示Data(畫像Data)的寫入開始位置信號。輸出信號與下一個(gè)Gate Driver的Start Pulse輸入端子進(jìn)行接續(xù)OutputGnn=1,2,3Gate Driver的輸出信號作為LCD Panel的TFT Gate端子的供給信號，根據(jù)此信號進(jìn)行TFT的ON/OFF控制。-6-Gate DriverGate Driver Timing ChartTiming Chart-7-Ga

5、te Driver SchematicGate Driver Schematic-8-Shift registerShift register-9-Level shifterLevel shifter-10-Theorem of TFT LCD Source DriverTheorem of TFT LCD Source DrivernSource Driver StructureSource Driver StructurenOP of Source DriverOP of Source DrivernDAC of Source DriverDAC of Source Drivern2 St

6、age OP2 Stage OPnCharge SharingCharge Sharing-11-Source Driver StructureSource Driver Structure根據(jù)根據(jù)Start Pulse (STHRStart Pulse (STHR或者或者STHL)STHL)和輸入時(shí)鐘信號（和輸入時(shí)鐘信號（CLKCLK）, , 通過通過Shift RegisterShift Register，將圖像信號依，將圖像信號依次存儲(chǔ)到次存儲(chǔ)到Data RegisterData Register中，利用中，利用LatchLatch電路在電路在1 1個(gè)水平周期將其個(gè)水平周期將其Latch

7、Latch，最后通過，最后通過D/A ConverterD/A Converter變換為變換為AnalogAnalog信號輸出。信號輸出。 -12- Source Driver主要的輸入輸出信號：InputCLKShift Register用的Clock信號在上升沿時(shí)將顯示Data存儲(chǔ)到Data Register中STBData Register中的內(nèi)容進(jìn)行Latch的控制信號R/LShift Register的Shift方向切換信號Ex./R/L=High Level Input: STHR, Output: STHL STHR-S1-S2.-Sn-STVL R/L=High Level I

8、nput: STHL, Output: STHR STHL-Sn-.-S2-S1-STVRDn0Dn5 顯示數(shù)據(jù)， Dn0: LSB , Dn5: MSBPOL極性反轉(zhuǎn)信號為了對液晶進(jìn)行交流驅(qū)動(dòng)，根據(jù)POL的Logic Level選擇使用階調(diào)電壓的極性（V0V9）Ex) POL=Low Level: S2n-1輸出V0V4, S2n輸出V5V9 POL=High Level: S2n-1輸出V5V9, S2n輸出V0V4V0V9階調(diào)電源輸入進(jìn)行r補(bǔ)正時(shí)所需的外部階調(diào)補(bǔ)正用電源輸入。Input/OutputSTVR,STVLShift Register的輸入輸出信號，輸入時(shí)，在CLK的上升沿讀入

9、。（根據(jù)R/L信號，控制STVR和STVL的輸入輸出方式）此信號控制顯示數(shù)據(jù)的讀入開始位置。OutputGnn=1,2,3Source Driver的輸出信號對LCD Panel的Drain線進(jìn)行信號供給，可以提供D/A變換后的64階調(diào)的Analog電壓。-13-Source DriverSource Driver Timing ChartTiming Chart-14-OP of Source DriverOP of Source Driver-15-DAC of Source DriverDAC of Source Driver-16-2 Stage OP2 Stage OP-17-Operation of 2 Stage OPOperation of 2 Stage OPApplicationVin- connect to OutputWhen Vin+ Voutput Vnode1IM5Voutput(Normal OP function)Vnode1IM11Vnode4IM13Vnode6IM6Voutput(Slew Rat