E-paper has been around for 20-plus years and it has gradually been improving to a point that it makes operating, commercial and visual sense for digital signage applications.
There are companies like Slovenia's Visionect that do a really nice job of making small black and white displays look beautiful for applications that vary from meeting room signs and hotel reception greeters to solar-powered transit schedule signs. That company, and many others, use E Ink technology.
E Ink spun out of MIT's famed Media Lab more than 20 years ago and is the best known and most successful company in the e-paper field. If you have a Kindle e-reader, you are using Link technology.
The company is now based in Taiwan but a lot of R&D still comes out of the Boston area. They had a big stand recently at DSE - including new four-color large format displays. They looked really nice, though if you didn't know how the tech works you'd swear these screens were having 10-second seizures as they changed content. The refresh rate is still slow and something less than elegant.
I spoke with Jenn Vail, Director of Business & Marketing Strategy, about the past, present and future of e-paper.