Truly TFT-LCD Product Roadmap

TFT New Technology Introduction
AFFS = Advanced Fringe Field Switching
Viewing Angle Problem of LCD
•
•
•
•
Narrow Viewing Angle due to
1) Anisotropy of liquid crystal (Δn, Δε)
2) Different Transmittance with view angle
3) Imperfect light control by Polarized and Refracted Light
Δ
Θ
n(
CR = good
λ)
,Φ,
CR = Bad
CR = Normal
Off
On
On
On
Off
Off
LC
Θ
Polarized Light
To Solve these problems,
* In Plane Driving such as FFS, IPS
* VA, OCB… with Compensation Film
* Dual ~ multi domain
Analyzer
Φ
+LC
Polarizer
Contrast Ratio with View Angle
IPS mode : Slight dependency of Contrast Ratio (G127/G63)
VA mode : Steep decrease with increasing viewing angle
Half Contrast Ratio of IPS mode is much wider than that of VA mode
Trend of Wide View Technology
The Main Stream of Wide View Technology is IPS Camp & VA Camp
S-IPS & AFFS
BOE HYDIS
Hitachi
OCB
TN + WV film
TMD
LG. Philips
TMD
SEC
NEC
Wintech
Hanstar
AUO
ID.Tech
VA
Samsung
(PVA)
SelfLicensed
Torisan
(SVA)
Fujitsu
(MVA)
CMO
(MVA)
CMO
BOE HYDIS
TRULY
Sharp
(ASV)
AUO
(MVA)
Mode Comparison of AFFS and Others
AFFS (Adv. Fringe Field Switching)
Transmittance
= Tosin2 2Φ sin2(πdΔn/λ)
Light
 High Transmittance
(Transparent Electrode)
 Low_ Driving Voltage
& _Power Consumption
 Higher Contrast Ratio
 Co-plane Fringe Field (Ey, Ez)
C/F
Electric Field
dcell
Metal electrode
ITO electrode
dSiNx ~ 600nm
l
w
PVA (Vertical Alignment)
S-IPS (In Plane Switching)
Light
C/F
 Higher_ Driving Voltage
& _ Power Consumption
 Higher Contrast Ratio
 Vertical Field (Ez)
dfield > 3.5μm (dcell)
Light
C/F
dcell
w
l
l
w
Pixel Image Comparison of AFFS and others
AFFS
S-PVA
AS-IPS
AFFS
(measured)
AS-IPS(S-IPS)
(Reference)
S-PVA(PVA)
(Reference)
Clean Image
Vivid Moving Color
Good Color
High Dynamic CR
High Static CR
Fast on/off
Transmittance
5%
3.8%(<3.4%)
4.9%(4.1 %)
Contrast Ratio
~800:1
~650:1
~900:1
Feature of AFFS vs. IPS
`
In Plane Switching
Advanced Fringe Field Switching
C/F
C/F
E
d
d
Vpixel
Vcom
w
w
l
IPS
AFFS
l/d
>1
≤1
l/w
>1
≤1
Field
Ey (In Plane)
Ey, Ez (Fringe Field)
Metals
Folded ITO
Electrodes
● AFFS : High Transmittance by transparent electrode and low Vop
● IPS: Low Transmittance by metal electrode and high Vop
l
Wide View & High CR at any Point
AFFS can make High CR & Wide View at any Point without any other Tech.
700
■ Horizontal
◆ Vertical
C o n tra st R a tio
600
500
400
300
200
100
0
-90
-60
-30
0
30
60
V ie w in g A n g le (d e g )
90
Low Driving Voltage
The Lowest Driving Voltage among the other Normally Black modes
AFFS  Low Power Consumption
AFFS  Drive IC 20~30% Cost competitiveness from Low driving Voltage
Advantage of AFFS( Low Driving)
6
FFS 32"
IC Power
AFFS <12V
100%
100%
-60%
S-IPS <15V
120%
120%
80%
PVA
140%
140%
100%
<18V
• More Shrinkage Drive IC than High Voltage Drive IC
- Cost competitiveness by 10~20%
Operation Voltage
5.4V
PVA 32"
5
S-IPS 30"
Transmitence (%)
Tech AVDD Chip Size Price
6.2V
4
3
7.2V
2
1
AFFS  Need 12V Drive IC (Low Driving)
 Low Power Consumption
S-IPS, VA  Need 15~18V IC (High Driving)
 Power Consumption Increase
0
0
1
2
3
4
5
Operation Voltage (V)
6
7
8
Low Power Consumption
Power consumption of 12.1” XGA with AFFS is 20% lower
⇒ Maximize Portability & Green Compliance
Power Consu mption (W)
1.2
FFS
TN
1
0.8
0.6
0.4
0.2
0
White
Black
Max
Measured Condition
Comparison of the power consumption AFFS vs TN (in 12.1” XGA)
Free of Ripple and Pooling
Co-plane aligned LC molecules leave no ripples when the display is touched and pressurized
Other Display (TN, VA…)
AFFS Display
Pooling (Pen Pressing)
Cause of Ripple/Pooling Free
Flickering
Distorted LCs can’t be recovered
By the propagation of E field via
vertical electrode, low field and
vertical align.~ 0.8V/μm
Pooling (pushing) Trace ⇒ Disappear
weighting of 500g
White Black
*Normally White (TN)
< 1s
> 2s
*Normally Black (VA, IPS)
< 3s
<1s
*AFFS Mode
<1s <1s
Distorted LCs can be fast recovered
by high fringe electric (magnetic)
field and horizontal alignment
~ 6.2V/μm (IPS ~ 0.8V/μm)
Thanks!