Samsung Display is set to demonstrate a 9.1-inch stretchable AMOLED prototype during SID 2017. This display can stretch up to 12 mm when pressed, and still maintain its high resolution (which SDC did not specify).

SDC Stretchable AMOLED prototype (SID 2017)

This is an exciting development - but we're all waiting for Samsung to first commercialize its foldable OLEDs, and only then can we expect to see commercial rollable and stretchable displays.