Researchers at HP Labs have built a small, multi-angle, glasses-free 3D display that, one day, could allow for smartphones, tablets, and watches to produce Princess Leia-like holograms. The current prototype devices can produce full-parallax 3D images and videos that are viewable from up to a meter, within a 90-degree arc -- and, like the Star Wars hologram, the 3D image or video varies as you move your head up and down, or around the display.