E-ink maybe isn't it, anyway. A few years ago I built an e-ink clock/gimmick that refreshed every few seconds with some different text on a given part of the screen, and within 1.5 years the sides unto about 2cm in - but not the parts being constantly refreshed! - had more stuck/weak pixels than not. A halo of rot. 50 years is a long time, much longer than 1.5.