_{Courtesy Popular Science - www.popsci.com}

How it Works: The display converts the video signal [A] into electricity that it uses to stimulate a slice of lithium niobate crystal [B], which produces sound waves [C] in response to the current. These waves diffract lasers [D] through the crystal, turning them into hundreds of slices of light. That light travels through two mirrors [E] that project it at various angles onto a screen, where the slices stack up on either side of the display to create a 3d hologram.