According to
this report, Amazon is developing a smartphone with a 3D screen that doesn't require the use of glasses.
One of the devices is a high-end smartphone featuring
a screen that allows for three-dimensional images without glasses,
these people said. Using retina-tracking technology, images on the
smartphone would seem to float above the screen like a hologram and
appear three-dimensional at all angles, they said. Users may be able to
navigate through content using just their eyes, two of the people said.