5+ + + + +
Frame N+1 Columns
12345 1⌒ ⌒ ⌒ ⌒ ⌒
2+ + + + + Lines 3 ⌒ ⌒ ⌒ ⌒ ⌒
4+ + + + + 5⌒ ⌒ ⌒ ⌒ ⌒
Frame Inversion
Row Inversion
Frame N Columns
12345 1+⌒ +⌒ + 2+⌒ +⌒ + Lines 3 + ⌒ + ⌒ + 4+⌒ +⌒ + 5+⌒ +⌒ +
Vgpp Vgd
Vst:影像ቤተ መጻሕፍቲ ባይዱ號的直流位準
Tg
Vspp
Vgd
Vd'
Vd" Vgh Vgon-min Vsh
Vdh Vst
Vc:Common Vsl
Vgoff-min Vdl Vgl
TFT电容效应的影响
Vgd
Cgd
CgdVghl Cs CLC
Csd
CgdVghl
Cgd Cs CLC
Ex : CLC 0.2 pF,Cs 0.8 pF,Cgd 0.05pF
Frame N+1 Columns
Frame N Columns
12345 1⌒ + ⌒ + ⌒
12345 1+⌒ +⌒ +
2⌒ + ⌒ + ⌒
2⌒ + ⌒ + ⌒
Lines 3 ⌒ + ⌒ + ⌒ Lines 3 + ⌒ + ⌒ +
4⌒ + ⌒ + ⌒ 5⌒ + ⌒ + ⌒
4⌒ + ⌒ + ⌒ 5+⌒ +⌒ +
Gate
Vgh
Vgon-min Vdh
Sour c e Drain
Vgpp Vgd
Vc pp
Vgd
Vspp
Vsh
Vst Vc t Vsl
Common WaveForm
Vdl Vgoff-min Vgl
TFT LCDs Driving Waveform Cs on Gate
Gate Source
Drain
RGRG GBGB RGRG GBGB
RGRG WBWB RGRG WBWB
Pixel Structure of TFT LCDs
資料電極 Mth Data Line
掃描電極 (N-1)th
Scan Line
Common
資料電極 Mth Data Line
Common
資料電極 Mth Data Line
(N-1)th Scan Line
Common1
(N-1)th Scan Line
Clc
Cs
Clc
Cs
Clc
Common2 Cs
掃描電極 Nth Scan Line
液晶電容:Clc
儲存電容:Cs
共通電極:Common
寄生電容:Cgd
Cgd Cs on Common Mode 液晶畫素電容:Clc+Cs
Vghl Vgh Vgl 20 10 30V
Vgd
0.05
30 1.43V
0.2 0.8 0.05
Cgs Csd
Csdb
T 正極性訊號時 共通電極訊號位準
100%
Vth -1.5V Vth:液晶的操作臨界電壓
負極性訊號時 共通電極訊號位準
負極性訊號時 光電轉移曲線 正極性訊號時 光電轉移曲線 Vth
5V V
TFT LCDs Driving Waveform Cs on Common (一)
Source Drain
Vgpp Vgd
Cs Gate Line
液晶画素 Cs
Cs on Gate
Timing Chart of TFT LCDs
Gate
Frame Time
1
2
3
Time
N
TFT LCDs Driving Method
Frame N Columns
12345
1+ + + + +
2+ + + + + Lines 3 + + + + +
V4
V3
V2
V1
V0
V0
V1
V2
V3
V4
V5
1Frame / 1 Line
V6
V7
DC Bias of Common
AC Modulation Addressing of TFT LCDs
Graylevel
V0
Voltage
V7
V1
V6
V2
V5
V3
V4
V4
V3
V5
V2
V6
V1
V7
V0
Common Waveform
Cgd
Nth Scan Line
Cs on Gate Mode
Cgd
Nth Scan Line
Cs on Gate Mode
Cs on Common与Cs on Gate架构
Data Line Data Line
TFT
Cs on Common
Cs Common
Gate Line TFT
液晶画素
Cs Common
1Frame / 1 Line
TFT LCDs的电光效应 Direct Addressing
T 100%
負極性訊號時 光電轉移曲線
共通電極訊號位準
正極性訊號時 光電轉移曲線
Vth
Vth
3.5V
6.5V
V
Vth:液晶的操作臨界電壓
負極性時 正極性時
臨界電壓 臨界電壓
5V
TFT LCDs的电光效应 AC Addressing
4+ + + + +
5+ + + + +
Frame N+1 Columns
12345 1⌒ ⌒ ⌒ ⌒ ⌒ 2⌒ ⌒ ⌒ ⌒ ⌒ Lines 3 ⌒ ⌒ ⌒ ⌒ ⌒ 4⌒ ⌒ ⌒ ⌒ ⌒ 5⌒ ⌒ ⌒ ⌒ ⌒
Frame N Columns
12345
1+ + + + + 2⌒ ⌒ ⌒ ⌒ ⌒ Lines 3 + + + + + 4⌒ ⌒ ⌒ ⌒ ⌒
Gate
Tg Vspp
Vgd
Vst:影像訊號的直流位準
Vgh
Vgon-min Vsh
Vdh Vst
Common Vsl
Vgoff-min Vdl Vgl
TFT LCD驱动波形 (Cs on Common, Common = DC Bias)
TFT LCDs Driving Waveform Cs on Common (二)
Frame N+1 Columns
12345
1⌒ + ⌒ + ⌒ 2+⌒ +⌒ + Lines 3 ⌒ + ⌒ + ⌒ 4+⌒ +⌒ + 5+⌒ +⌒ +
Column Inversion
Dot Inversion
Direct Driving of TFT LCDs
V7
V6
GrayScale
V5
Voltage
主动矩阵式液晶显示器 AM-LCDs
TFT LCDs等效电路
Column Driver
Row Drivers
Arrangement of Color Filter
RGBRGB RGBRGB RGBRGB
Stripe
R B G RB GRBG
R B G RB GRBG
R B G RB GRBG
Triangle