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The new display was possible thanks to the development of integration technologies of Organic Thin-Film Transistors (OTFTs) and OLEDs on an ultra-thin 20-micrometer thick flexible substrate. A flexible on-panel gate-driver circuit with OTFTs and soft organic insulators allowed Sony to get rid of the conventional rigid driver integrated circuit (IC) chips that would impede the rolling up of a display.
Source:
http://www.gizmag.com/sony-rollable-otft-driven-oled-display/15226/