3D without glasses

The dream for technology companies is to remove the need for glasses entirely. One way of doing this is by using lenticular lenses, which are shaped so that a different image is displayed depending on the viewing angle. Toshiba is using this technique in its glasses-free 3D TVs. However, the largest display is 21 inches - Toshiba says it will take time to make these displays affordable at larger screen sizes. A similar glasses-free 3D effect can be achieved using a parallax barrier, which sits on top of an LCD display to create a 3D effect - this is the approach that Nintendo has taken for the 3DS.