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This flexible grayscale OLED from Wisechip can be bent to a 40mm radius without damage. The display is less than 0.5mm thick, less than 0.5 grams, and can display some impressive graphics with great contrast. The OLED display is 1.81" long with 160x32 4-bit grayscale pixels with a 3-wire SPI interface. This means you will need a processor capable of storing a local array of 2,560 bytes in order to truly flex the power of the grayscale display.
The on-board buffer on the breakout also provides you with an option to hook the display straight up to 3.3V or 5V logic.
An Arduino library with text and graphics examples are available on the website of Sparkfun.