Photo via Phillips

e-Ink and e-Paper are fairly old news at this point. If you've had any interaction with an e-reader like the Kindle, then you've experienced e-paper. It's a technology for displays that has no need to backlighting and so is ultra energy efficient. Research has been going in to how to make e-paper colorful and able to display colors fast enough to enable video. But Philips has also been looking in to how to make the technology into something beyond displays. The company has created e-skin, e-paper that is really a skin for devices, or can even be scaled up to be wall paper. Color changing wall paper. Sounds neat - but what's the point of using this green technology for wall paper?