The Microsoft Applied Sciences Group in Research division has been investigating making devices that disconnect the apparent location of a displayed image from the location of the hardware so that the images appear to “float” in the air. In this way, you can allow one use is for allowing touch interfaces that don’t require physical contact.
Floating Display: Visual Cues for Gestural Interactions
Many people are working on near-field user-interface devices that detect hover, gesture, and pose. But there is nothing in the space in front of a device to show the user what to do. This project introduces a floating display that hovers over the device, providing visual cues for gestural interactions.
Microsoft Research team has created a prototype for this project and demoed it at 2014 Silicon Valley TechFest. You can see the demo in the above video.