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4 March 2019 Development of birefringent crystal-dispersed low-retardation/high-transparent polyimide film (Conference Presentation)
Hikaru Hotta, Katsuya Sakayori, Toshio Yoshihara, Norinaga Nakamura, Chikafumi Tanaka, Yasuhiro Koike
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Proceedings Volume 10943, Ultra-High-Definition Imaging Systems II; 109430J (2019) https://doi.org/10.1117/12.2508293
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
Transparent polyimides (TPIs) have a possibility for the using of foldable displays because of their enhanced flex resistance and high thermal stability. On the other hand, TPIs have high birefringence (= high out of plane retardation (Rth)) thus it causes the rainbow mura if when a display using a conventional TPI film was watched through polarized sunglasses. It was reported that optical films were decreased the retardation by doping with inorganic crystals, that have rod-shaped and the opposite birefringence to that of the polymers. However, if particle size and amount of added crystals are not optimized, its haze values are increased. The purpose of this article is to fabricate the low retardation TPI films with inorganic birefringent crystals such as strontium carbonate (SrCO3) crystals with their rod-like shape and opposite birefringence. We found small and nearly monodispersed SrCO3 suggested low Rth of 17 nm and low haze TPI films. The Rth value of this film is almost same of triacetylcellulose film, which is widely used in display as low retardation film. This low retardation film was obtained by casting method from the under 100 nm SrCO3 dispersed TPI solution.
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Hikaru Hotta, Katsuya Sakayori, Toshio Yoshihara, Norinaga Nakamura, Chikafumi Tanaka, and Yasuhiro Koike "Development of birefringent crystal-dispersed low-retardation/high-transparent polyimide film (Conference Presentation)", Proc. SPIE 10943, Ultra-High-Definition Imaging Systems II, 109430J (4 March 2019); https://doi.org/10.1117/12.2508293
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KEYWORDS
Crystals
Birefringence
Air contamination
Carbonates
Doping
Particles
Polymers
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