Sony has developed a 9.9" 960x540 (111ppi) flexible OLED panel, using an Oxide-TFT (IGZO) backplane and a WOLED-CF architecture (RGBW). The thickness of this panel is only 110 um. To make this panel, Sony used two glass substrates (for the backplane and the color filters) during the production process, which were later removed. This allows Sony to use their regular OLED manufacturing process. We're not sure what kind of material is used as the final substrate.
The small-molecule OLED materials were deposited using vapor deposition. Unfortunately the company didn't demonstrate this panel at SID.
Sony has been developing flexible OLEDs for quite some time. Their previous prototype in 2010 was a rollable 4.1" 423x240 resolution (121ppi) panel made on an organic semiconductor material (PXX - peri-Xanthenoxanthene) derivative and was using organic TFTs (OTFTs).