LG G Flex 2's P-OLED stands for Plastic OLED~? Now then I know, maybe plastic is more bendable~
Plastic OLED explained
This kind of OLED has not a glass substrate, LG Display use a PLASTIC Substrate.
Plastic, not glass
The problem of plastic substrate is that it cannot stand high temperatures. LG Display developed a plastic substrate based on PI or polyimide which is stable under high temperatures and has chemical stability.
During the development of the coating process of large format Polyimide it is possible to produce curving technoloty and the technology to eliminate unnecessary bubbles and foreign substances.