Researchers at the Korea Institute of Production Technology said Wednesday that they had developed a fluorine-based polyimide film, allowing them to create the material without relying on imports from Japan.
The material is an important component of foldable screens since it eliminates creases when folded. It has been under Japanese government export restriction since 2019, which has caused concern among Korean businesses owing to their reliance on commodities manufactured in the neighboring country.
“We focused on fluorine-based polyimide since it is a critical material for next-generation display development.” Based on the findings, we want to work on producing materials that can be used to all goods employing flexible screens,” said Hong Sung-woo, who led the film’s development team.
Flexible optical sheets made from polyimide engineering polymers keep foldable displays from breaking, cracking, or wrinkling.
Existing films have the fatal flaw of yellowing displays, which is produced by electron transfer, which easily absorbs light in the low wavelength region. According to the experts, the new polyimide film produced by Hong’s team is more elastic and has no concerns with yellowing displays.
Even after folding the display over 200,000 times, the film did not shatter, fracture, or wrinkle, according to the company.
The findings of the study were featured as the cover story of the May edition of Advanced Functional Materials, a weekly academic publication in the subject of materials.