Scientists have developed an incredibly cheap method to build an electronic display. They made it out of electric wiring, paper, and the thermochromic ink found in mood rings. The result is a foldable, color-changing display.
There isn’t really any major technological developments involved. The ink changes color depending on its temperature. By evenly layering the ink across paper, and adjusting the ink’s temperature via various electric voltages, the appearance of the paper can be altered.
At the moment, this is really just a proof of concept. It’s planned use is for integrated displays in affordable scientific tools, such as a water tester. But what if the technology was refined and used as a cheaper alternative to an E-Ink display? A fine tuned electric grid placed across a thermochromic surface could create a durable, relatively inexpensive, dynamic display. The refresh rate wouldn’t be fast enough to be a computer monitor, but it could work as an eReader.
Such an application is probably unlikely due to the long head start of eInk technology, but display is fairly cool nonetheless. If you want, you can try to build one yourself, but I’ll warn you that the paper can get a bit technical.