Yukiko Kanoh, Nikkei Electronics
The National Institute of Information and Communications Technology (NICT), an independent administrative institution in Japan, developed a display that can be operated by touching an image floating in the air.
For example, the "floating touch display" is expected to be used for medical purposes and for cooking because it can be operated while keeping the hand clean or operated with a dirty hand.
Optical devices developed by NICT are arrayed on an LCD display to show a
n image on the display as if it is floating in the air. The position of the fingertip touching the floating image is detected by an infrared touch panel with no glass. The floating image is very solid. And it is possible to view an image that is staying motionless in the air even when the line of sight moves in any direction.
The optical device developed by NICT is an imaging optical device that uses a micromirror array to form a real image from a mirror image. This optical device enables to display a 
floating image by forming a real image as a concave mirror or convex lens does. However, different from them, it does not distort an image even when the image is formed from a 3D object; therefore, the position of the image does not move regardless of movement of a viewpoint.
floating image by forming a real image as a concave mirror or convex lens does. However, different from them, it does not distort an image even when the image is formed from a 3D object; therefore, the position of the image does not move regardless of movement of a viewpoint. There is a problem that the size of the optical device is too small, limiting the size of the floating image. But NICT plans to solve this issue by developing a new manufacturing technology. It aims to display a full-size image of a person in three years.
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