Here’s a near-zero-energy use solution to e-ink displays as price tags on retail shelves.

Traditional e-ink LCD displays need constant power (although low) to keep their displays showing, but researchers at ZBD Solutions have developed a way to keep an LCD screen’s black pixels in place even when the power is pulled completely. This allows retailers to only use power to update the price tags wirelessly, reducing the amount of printing needed to put things on sale. Smart!