Transcript 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 本資料中の数値およびデータに関する記載事項 は、本資料作成時点において入手可能な情報に 基づいて作成したものです。 本資料の無断複製・転載を禁じます。 TOYOBO All Rights Reserved 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.