Driver IC功能介绍

1、合肥京东方光电科技有限公司合肥京东方光电科技有限公司BOEHF 开发开发中心20102010年年 7 7月月 2222日日Driver ICDriver IC功能介绍功能介绍-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内容内容-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根据根据Start Pulse(STV1Start Pulse(STV1或或STV2)STV2)和输入时钟信号和输入时钟信号CPV, CPV, 通过通过Shift RegisterShift Register和和Level ShifterLevel S

3、hifter依次以依次以1 1个水平周期输出个水平周期输出VGHVGH电压，电压， 其他时间则输出其他时间则输出VGLVGL电压。电压。-5- Gate Driver主要的输入输出信号：InputCLKShift Register用的Clock信号在上升沿时输入数据（STVR, STVL）进行Shift。OEGate Driver的输出Enable/Disable控制信号R/LShift Register的Shift方向切换信号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的输入信号，输入时，在CLK的上升沿读入。作为机能为表示Data(画像Data)的写入开始位置信号。输出信号与下一个Gate Driver的Start Pulse输入端子进行接续OutputGnn=1,2,3Gate Driver的输出信号作为LCD Panel的TFT Gate端子的供给信号，根据此信号进行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根据根据Start Pulse (STHRStart Pulse (STHR或者或者STHL)STHL)和输入时钟信号（和输入时钟信号（CLKCLK）, , 通过通过Shift RegisterShift Register，将图像信号依，将图像信号依次存储到次存储到Data RegisterData Register中，利用中，利用LatchLatch电路在电路在1 1个水平周期将其个水平周期将其Latch

7、Latch，最后通过，最后通过D/A ConverterD/A Converter变换为变换为AnalogAnalog信号输出。信号输出。 -12- Source Driver主要的输入输出信号：InputCLKShift Register用的Clock信号在上升沿时将显示Data存储到Data Register中STBData Register中的内容进行Latch的控制信号R/LShift Register的Shift方向切换信号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 显示数据， Dn0: LSB , Dn5: MSBPOL极性反转信号为了对液晶进行交流驱动，根据POL的Logic Level选择使用阶调电压的极性（V0V9）Ex) POL=Low Level: S2n-1输出V0V4, S2n输出V5V9 POL=High Level: S2n-1输出V5V9, S2n输出V0V4V0V9阶调电源输入进行r补正时所需的外部阶调补正用电源输入。Input/OutputSTVR,STVLShift Register的输入输出信号，输入时，在CLK的上升沿读入

9、。（根据R/L信号，控制STVR和STVL的输入输出方式）此信号控制显示数据的读入开始位置。OutputGnn=1,2,3Source Driver的输出信号对LCD Panel的Drain线进行信号供给，可以提供D/A变换后的64阶调的Analog电压。-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