American researcher Robert A. Freitas Jr., a nanotechnology specialist at the Institute for Molecular Manufacturing (USA), is working on a tactile nanodisplay to be implanted a few millimetres under the skin.
© Animation by Gina Miller, Robert A. Freitas Jr.
This display would be made up of three billion robot-pixels over a surface of a few square centimetres. The photons emitted by these pixels would produce a picture on the surface of the skin. Activated or deactivated by tapping the hand with a finger, it could be programmed to display information gathered from sensors in or on the human body, such as heartbeat, concentration of oxygen in the blood, glucose level, blood pressure, etc.