910522-TFT驱动原理

1、Product Develop Dept.12021/8/21TFT-LCD驅動原理介紹主講:產品開發一處開發二部蔡永裕 ext.12295Product Develop Dept.12021/8/22Agenda液晶顯示原理驅動方式介紹常見問題討論Vm marginFlickerTCP MuraProduct Develop Dept.12021/8/23液晶顯示原理Product Develop Dept.12021/8/24光有水平與垂直兩種偏振性一般光是由水平與垂直混合而成垂直偏光板只讓垂直偏振的成分光通過，而水平偏光板只讓垂直偏振的成分光通過液晶可被光穿透，並可以影響光的偏振性未加電

2、壓時，液晶分子可將垂直偏振的光轉變成水平偏振的光，通過水平偏光版Product Develop Dept.12021/8/25加一大電壓在液晶上，液晶分子的方向性遭到電場改變，此時光雖通過液晶，但是其偏振性並未受到影響，因此仍保持垂直的偏振，無法通水平偏光板過Product Develop Dept.12021/8/26VoltageTransmittance(%)小大經由加在液晶上電壓的高低可以控制穿透光的多寡，進而控制紅綠藍三種顏色的亮暗程度。（顏色由Color Filter產生）Product Develop Dept.12021/8/27液晶T-V Curve(0)VTV0V4V3V2

3、V1V9V5V6V7V8TFT I-V CurveVdsIVgs=10vVgs=8vVgs=6vVgs=4v1.0E-60.8E-60.6E-60.4E-60.2E-6(11)Product Develop Dept.12021/8/28COMClcCstCgdCOMClcCstCgd(N-1)th Data Line(N)th Data Line(M-1)th Scan Line(M)th Scan Line(a) Cs on CommonClc: 液晶電容Cst: 儲存電容COM:液晶共同電極Cgd: 寄生電容COMClcCstCgdCOMClcCstCgd(N-1)th Data Lin

4、e(N)th Data Line(M-1)th Scan Line(M)th Scan Line(b) Cs on Gate圖1.1 液晶畫素的等效電路V0(0)V9(0)VglVshVslVdhVdlVstVst:影像信號的直流位準Vgon-minVgoff-minVsppVgdProduct Develop Dept.12021/8/29VsyncVcom(DC)V0(0)V1(16)V2(32)V3(48)V4(63)V5(63)V6(48)V7(32)V8(16)V9(0)Vcom(AC)V0(0)V1(16)V2(32)V3(48)V4(63)V5(63)V6(48)V7(32)V8

5、(16)V9(0)圖1.2b Frame Inversion Data SignalsFrame_1Frame_2Columns1+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +2 3 4 5 6 7 812345678RowsColumns1-2 3 4 5 6 7 812345678Rows-(4)Product Develop Dept.12021/8/210Frame_1Frame_2圖1.3b Line Inve

6、rsionColumns1+ + + + + + +-+ + + + + + + +2 3 4 5 6 7 812345678Rows-+ + + + + + +-+ + + + + + + +-Columns1+ + + + + + +-+ + + + + + + +2 3 4 5 6 7 812345678Rows-+ + + + + + +-+ + + + + + + +-HsyncVcom(DC)V0(0)V1(16)V2(32)V3(48)V4(63)V5(63)V6(48)V7(32)V8(16)V9(0)Vcom(AC)V0(0)V1(16)V2(32)V3(48)V4(63)V

7、5(63)V6(48)V7(32)V8(16)V9(0)(6)Product Develop Dept.12021/8/211Frame_1Frame_2圖1.4a Column InversionColumns1 2 3 4 5 6 7 812345678RowsColumnsVsyncVcom(DC)V0(0)V1(16)V2(32)V3(48)V4(63)V5(63)V6(48)V7(32)V8(16)V9(0)Vcom(AC)V0(0)V1(16)V2(32)V3(48)V4(63)V5(63)V6(48)V7(32)V8(16)V9(0)+-+-+-+-1 2 3 4 5 6 7 8

8、12345678Rows+-+-+-+-(8)Product Develop Dept.12021/8/212HsyncVcom(DC)V0(0)V1(16)V2(32)V3(48)V4(63)V5(63)V6(48)V7(32)V8(16)V9(0)Frame_1Frame_2圖1.5b Dot InversionColumns1- + - + - + - + - + - + - +2 3 4 5 6 7 812345678RowsColumns1 2 3 4 5 6 7 812345678Rows- + - + - + - + - + - + - +- + - + - + - + - +

9、- + - +- + - + - + - + - + - + - +- + - + - + - +- + - + - + - + - + - + - +- + - + - + - + - + - + - +- + - + - + - + - + - + - +- + - + - + -+(10)Product Develop Dept.12021/8/213EE Function BlockDC2DCTCONGamma1111111TFT ARRAYLVDS RXOthersData DriversScan DriversFPCX-PCBY-PCBFPC(1)驅動電路介紹Product Dev

10、elop Dept.12021/8/214Gate pulseDataProduct Develop Dept.12021/8/215Gate pulseDataProduct Develop Dept.12021/8/216Source Driver ArchitectureProduct Develop Dept.12021/8/217Product Develop Dept.12021/8/218Product Develop Dept.12021/8/219Product Develop Dept.12021/8/220Product Develop Dept.12021/8/221V

11、m= 1/2 (|VGH |-| VGL |) - 1/2 (|VG1|-| VG10 |) VGHVGLVG1VG10VGHVGLVG1VG10VGHVGLVG1VG101).OFF margin2).ON marginVm margin VGH= 16VVGL=-7VVG1=8 VVG10=0 VVm=0.5 VProduct Develop Dept.12021/8/222AKT Alpha -18 -16 -14 -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 16 1.E-05VG(V)ID(A)1.E-061.E-071.E-081.E-091.E-101.E-1

12、11.E-121.E-13 Gma1 = 8v VG= 8v VGH = 16v Gma10 = 0v VG= 16vVT84.53.50Product Develop Dept.12021/8/223 -18 -16 -14 -12 -10 -8 -6 -4 -2 0 2 4 6 8 101.E-05VG(V)ID(A)1.E-061.E-071.E-081.E-091.E-101.E-111.E-121.E-13AKT AlphaVT84.53.50 Gma1 = 8v VG= -15v-11.5v VGL = -7v Gma5 = 4.5v Gma6 = 3.5v VG= -10.5v-

13、7v Gma10 = 0 v-15 -11.5 -10.5 -7Leakage current limitProduct Develop Dept.12021/8/224-6 -4 -2 0 2 4 6OFF marginON marginVm margin Product Develop Dept.12021/8/225VCOMClcCstCgsData LineN-1th Scan LineVCOMClcCstCgsVCOMClcCstCgsNth Scan LineN+1th Scan LineN-1th Scan LineVGHVGLNth Scan LineVGHVGLVGL)-(VGHCstClcCgsCgsVLC(Vth)Feedthrough Product Develop Dept.12021/8/226V0(0)V9(0)VglVshVslVdhVdlVstVst:影像信號的直流位準Vgon-minVgoff-minVsppVgdProduct Develop Dept.12021/8/227Scan d