Holographic displays coming to smartphones [News]

Looking at a stereoscopic 3-D display takes some mental gymnastics. When you look at objects in real life, your brain expects the area of focus to be the same as where your eyes need to converge. But in order to see in stereoscopic 3-D-in which a different image is presented to each eye-you focus on the screen but your eyes converge where the image appears to be. For some, this is a headache-inducing dilemma.