I keep hearing about this A4 paper but I'm skeptical about the quality. I think the concept of using it as a map with live feedback using e-paper was posted a few articles after the article about A4 paper was posted on Gizmodo.
What you would want is Sony's concept OLED's even though they have an organic lifespan. =[ Their contrast ration is 1,000,000:1 so that's something worth looking at.