Depositing the CIGS materials evenly on glass or metalfoil is a lot harder than it sounds, and figuring out a way to mass produce thin films is another big challenge.
Besides Pixel Qi, Qualcomm, Fujitsu, and Philips are trotting out their Mirasol (with a rumored Kindle destination), FLEPia, and Liquavista display demos, respectively, while LG Display is demonstrating its Metal-Foil e-Paper display for the first time on the Skiff Reader.