You could soon watch 3D videos on your smartphone without any special eyewear, thanks to scientists who have developed a way to make displays for small screen devices that offer both 2D and 3D imaging. For eyewear-free displays, the only action is behind the screen where the image's pixels and optics are layered together to produce the stereoscopic effect.
The simplest example of this effect is found on a movie poster whose image appears to change as you walk by. In the case of 2D/3D convertible screens, these layers are active, meaning they can be switched on or off.
