Piksol Solar Powered Shadow Panels

Here’s a rather interesting concept, dubbed Piksol. The device is really a solar powered shadow casting, panel, which seems rather useless on its own, but when used in large quantities, can come up with some rather interesting facades. As can be seen in the video (below), a large surface that sports many Piksol units bunched together can easily display the different pictures on the same surface. Could this be the future of billboards?