LCD驱动原理.ppt

,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,TFT,驱动原理,目 录,一、显象基本原理,二、驱动电路介绍,三、部分功能定义介绍,一、显象基本原理,存储,(,记录,存储,(,记录,光电子信号,转换,1、显象过程,2、扫描方式,1,隔行扫描,(,Interlace Scan,依次驱动奇数行,，,在下一场中驱动偶数行,，,在两个场中构成整个画面(,Frame,。,依次驱动每一行,，,以,1,场形成,1,帧的方式构成整个画面,是目前,TFT-LCD,驱动方法,。,2,逐行扫描,(,Progressive Scan,Progressive Scan V,s,Interlace Scan,隔行扫描,逐行扫描,隔行扫描是在播映时把,“,单行,”,及,“,双行,”,的画面合并，而每幅,“,奇数行,”,及,“,偶数行,”,的画面时间上大约会有六十分之一秒的相差，当画面合并时，多会有些偏差而导致画面不够清晰，逐行扫描之中每格画面的行数都相同，故此在进行定格时画面自然会较清晰。,3、扫描频率,逐行扫描,-,如果分辨率为,1920*1080,即有,1080,行,而此,1080,行构成1帧,帧频率是60,Frame/S,-,每秒钟显示60个画面,4、LCD,驱动方式,y1,y2,y3,y4,y5,y6,y7,x1,x2,x3,x4,x5,x6,Storage Capacitor,Switching Device(TFT,(,Active Matrix LCD,A,有源,(Active,BActive,说明,有源矩阵,LCD,：,有源矩阵,LCD,的上下表层也纵横有序排列着用铟锡氧化物,(ITO,做成的透明电极。在每个像素中都加入薄膜晶体管,(TFT,，可以迅速灵活控制单个像素单元。由于,TFT,电极是利用薄膜技术制作的，薄膜晶体管液晶显示器,（TFT-LCD,也因此得名。,1、,Circuit Introduction,FPC,Gate,Drive,IC,&,TCP,Source,Drive,IC,&,TCP,Panel,DC-DC,Gamma,LVDS,PCB,Timing,Controller,Data,Filter,二、驱动电路介绍,(1FPC,结构,2、驱动电路模块,User,Connector,LVDS Input/RSDS Output,Timing Controller,XGA TFT-LCD Panel,Gate,Driver,DC-DC,Converter,Control Signal,VCOM,Gamma,DVDD,AVDD,Von/Voff,Gamma,Generator,VCOM,Generator,SOURCE PCB,Source,Driver,Data Signal,LVDS,RSDS,Circuit Block Diagram,example,RSDS reduced swing differential signal,，低摆幅差分信号,三、部分功能定义介绍,1、,Interface,部,1,O,utput Signal,Vsync,、,Hsync,、,DE,、,Data,、,Clock,2,相关解释,Vsync：,决定显示图像的垂直位置。,Hsync：,决定显示图像的水平位置。,DE：,决定显示图像的垂直/水平位置。,Data：,实际显示的图像数据。,Clock：,通知,Data,最小变化时间的标准信号。,3,控制,DATA,两种模式,ADE,模式,b Vsync，Hsync,模式,4,Waveform of out signal,2、,Timing Controller,部,LCD Control ASIC,(Timing Controller,Data Signal,(RSDS,LVDS Termination,Resistor,Notebook Circuit Schematic,1,示意图：,2,Functional block diagram,FPD-Link,Rcvr,6-8,Bit,Translator,Vertical&Horizontal,Counter,Programmable,Registers,EEPROM,Serial I/F,FPD87310,Data,&,Timing Ref.,RSDS-Tx,I/O MUX,RSR2:0 P/N,RSG2:0 P/N,RSB2:0 P/N,RSCK P/N,SP,GPO9:0,RxIN3+/-,RxIN2+/-,RxIN1+/-,RxIN0+/-,RxCLK+/-,CLK,HRef,VRef,SPDZ,RSTZ,EE_SD,EE_SC,TEST5:0,PI,2,2,2,2,10,LVDS,(from System,RSDS,(to column Driver,Control&Data,Signal Processor,Signal in external&internal Bus,1,4,.,1,XGA,Model,Data,Filters,System,Interface,Signal,Internal,Data,Bus,Signal,Timing,Controller,LVDS Embeded,4,Input timing of Timing Controller,VSYNC,HSYNC,DE,1,2,N,Pulse,width,Back,Porch,Front,Porch,Data,Valid,time,HSYNC,DE,Pulse,width,Back,Porch,Front,Porch,Data,Valid,time,V,total,H,total,Vertical Timing,Horizontal Timing,Clock,Starting,Pulse,Output Latch,Polarity,Option,Analog,Level,Data,Source,Driver,CLK,STH,TP,Rev,-,V1V10,(Gray,TTL/,RSDS,Gate,Driver,CPV,STV,-,-,OE,Von/Voff,-,5Control signal for Driver,example,XGA：M-CLK 65MHZ,STV：60HZ,STH、CPV、TP、OE：48KHZ,REV：24KHZ,OE:Gate Delay Compensation,6,信号解释,CLKP/N,:,通知,Data,最小变化的标准信号（,Driver IC。,POL(REV,:,决定,Source Drive IC,输出电压的,相位（与,Vcom,对比指定,+/-,。,STH,：Data,开始脉冲信号.,STB(TP,:Driver IC,输出的开始信号.,STV,:,指定,Gate,开始脉冲信号.,CPV,：shift clock input,显示,Gate Line,移动间隔时间的信号。,OE,：,控制,Gate On,输出（考虑,Line Delay,。,7,Output timing of Timing Controller(1,Output timing of Timing Controller(2,3、,Power Supply,部,VCC/VDD,:,外部输入,Panel,的电源，其规格有3.3,V、5V。,D,Vdd,:,为驱动电路部的,Digital,驱动部件(,TCN、Driver IC,所需的电压值为3.3,V.,VSS,:Logic/driver ground;,其电压值为0,V.,Power Supply,:,提供,Panel,的驱动电压及,Backlight,的电压。,Vl,：,外界输入,Backlight,的,Inverter,电源，其规格一般为12,V。,4、,DC-DC Generate,部,a,目的：产生开启或关闭,Panel TFT,的电压，以及,将其输,需标准电压。,b,电路图：,入到,Panel,所,c,输出相关信号：,Avdd,:,为产生,Gamma,电压、,Vcom,电压和,OP-AMP,所需,IC,所需的电压；电压值为3.3,V,Von,：TFT,的完全开启正电压，,其电压值为,18,26,V。,Voff,：TFT,的完全关闭负电压，,其电压值为,-6.5,-9,V。,dPower,信号时序：,Vdd-Avdd-Voff-Von,fCharge Pump-Von and Voff,正,Change Pump,产生,Von,负的,Change Pump,产生,Voff,5、,Vcom Generate,部,a,目的：产生,整个,Panel,的标准电压，,Gamma,电压的中心,.,b,电路图：,Tuning Vcom,with Variable resistor,注：,VR,调整时,Vcomc,变化，其它,Vcom,基本不变。,Vcomc,Gamma,电压,:,是指决定,LCD Panel,的,Gray,级的信号；,根据电阻的不同，其电压值产生差异而,形成的灰度色标电压.,b,电路图：,cGray Scale with a Linear L/C Voltage,L/C Voltage(V,Trans.(%,1.0,2.0,3.0,0,100,V1,V2,V3,V4,0,50,V5,Equal interval,of Gamma voltage,16,32,48,64,100,50,0,Trans.(%,Gray Scale,g,=1.0,g,=2.2,g,=3.0,Light Sensitivity of Human Eye,T=T,max,x (gray#/Max.Gray,g,d Gamma,电压分配编码,Level of external,supply voltage,Upper Gamma,R-String,Lower Gamma,R-String,7,、,Gate Driver IC,部,aInput/output Signal,b,电路图:,c,内部原理图,在,TFT-LCD Gate Line,中依次输入,Von,信号，使相应,Line,的,TFT,进行,Turn-On,输出,dWaveform of Gate Driver,9、,Gate&Source Driver IC,时序关系,TP,CPV,OE,Gate N-1,Gate N,Gate N+1,TP,信号的下降沿,一行,Data,信号输出,Gate,信号到来,打开此行的,TFT,此行接收信号,THANK YOU,！,