SRF

13/Oct./2015
Display Innovation CHINA 2015 / Beijing Summit
Super Retardation Film
“COSMOSHINE SRF® ”
～ Application to LCD Polarizer ～
YASUSHI SASAKI
TOYOBO Co.,LTD.
Industrial Films Development Department
1. Feature of SRF
SRF is a new PET film which eliminated iridescence (Rainbow-mura)
derived from birefringence.
Conventional PET
COSMOSHINE SRF®
2. Application to LCD Polarizer
The reliability of LCD strongly depends on the property of substrate film
which is the top surface material of LCD-panel.
3. Property of SRF
3-1. Typical property
 Higher retardation than conventional PET ⇒ Rainbow free.
 Lower moisture permeability than TAC ⇒ High reliability
4. Reliability of Polarizing Plates
Reliability Test Result of SRF based POL and TAC based POL
（85℃,85%RH, 500Hrs）
200Hrs
100Hrs
SRF
TAC
SRF
TAC
SRF/PVA/TAC
TAC/PVA/TAC
SRF/PVA/TAC
TAC/PVA/TAC
300Hrs
500Hrs
SRF
TAC
SRF/PVA/TAC
TAC/PVA/TAC
SRF
SRF/PVA/TAC
TAC
TAC/PVA/TAC
SRF based plate kept the polarizability even after 500hrs !
5. Reliability of LCD
Light leakage (Egg-mura) and Cell bending test result
偏光板
編號
構成
40℃，95%RH
高温・高湿試験
40oC/95RH後
40℃，Dry
高温試験
40oC後
常温，24時間
連続点灯試験
常溫點燈第24hr
CELL
四角翹曲
Bending
平均(mm)
TAC
TAC/K10
PVA
TAC
2.7~2.8
TAC
PVA
(D-COP)
COP
1.6~2.1
mm
mm
SRF ®
PET/K10
PVA
0.1
mm
TAC
40in. MVA-Panel,
上板＆下板
6. Conclusion




Polyester(PET) is an excellent material, but PET has not been
regarded as an optical material. This is due to its optical
anisotropy, which cause rainbow-mura.
In order to overcome this problem, we took the approach of
significantly increasing the optical anisotropy.
COSMOSHINE SRF® is a new PET film which eliminated
Rainbow-mura.
Applying SRF to the substrate of polarizing plate brings
remarkable improvement of the reliability of LCD.
Thank you
Thank
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APPENDIX. Principle of Rainbow Elimination
Light Source
POL
Birefringent Material
POL
Interference
Color
natural light
linear polarization
elliptic polarization
linear polarization
transmittance, -
wavelength dispersion of the 2transmitted light passing
I / I0 = 1/2·sin (π·Re/λ)
through crossed polarizer
0.5
Re=1000
Re=8000
0
400
500
600
wavelength, nm
700
 Transmitted light though birefringent material placed between crossed polarizers has interference
color, because its transmittance depends on the wave length.
 Transmitted light through SRF is colorless, because many ransmission peaks are mixed.

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