Report from Japan say that Sharp developed a new 3.4" bendable OLED prototype. The AMOLED display features a resolution of 540x960 (326 PPI), it has an aperture ratio of 57% and a thickness of 70um. The bending radius is 10mm, and the whole panel weighs 2 grams. The backplane is IGZO.
While this is reported as news, this panel seems to be quite similar to OLEDs Sharp unveiled at SID 2012 (yes, almost four years ago!). According to the reports, Sharp says that the display has a long lifetime and is "color shift free", as a result of newly developed tandem structure.