Hologram Manufacturers Association of India

Tech Virtual Keyboard is a Bluetooth-enabled device that can be connected to almost any computing system (laptops, PCs, PDAs, Pocket PCs or smartphones, the only requirement being that they must be Bluetooth-enabled), and which projects, via infrared, a holographic keyboard on any flat opaque surface. By means of a special detection technology, the device records the keys “pressed” by the user’s fingers (more precisely, the presence of the fingers in the area onto which a certain key has been projected) and sends the data towards the unit it’s connected to.
The holographic hologram keyboard is also ultra-portable, because the projector is quite small (9 x 3.5 x 2.5cm ) and it also runs on batteries (although just for a maximum of 120 minutes of continuous typing).
sources: http://news.softpedia.com/news/The-Holographic-Keyboard-20314.shtml