Could this be the e-paper of the future?

Andre Arsenault of the University of Toronto told New Scientist about a new display technology being worked on at U of T. The display is made from "photonic crystals" embedded in an electroactive polymer that stretches and contracts in response to electric signals. The signals changes the spacing between the tiny crystals, which causes them to reflect at different light frequencies - not only all visible frequencies, but also infra red and ultra violet.

Since the light is reflected, there is no backlight, and due to the nature of the crystals, no color filters are needed either - so the display can be extremely thin and flexible. The problem now is to scale up the technology to make multi-megapixel displays.