Laser projection keyboards were designed and patented by IBM engineers. A laser projected keyboard is a projection of a keyboard on any surface and it can be used by any one who knows how to use a computer. The virtual projected keyboard can sense the movement of human fingers and carry out its task by following a set of instructions.
A laser projected keyboard can also include the functions of other hardware devices like the mouse. This technology has been further utilized and advanced to make a video projector using the same technology. The advent of laser projection keyboard acted as a catalyst to a series of processes and today one can carry around a computer which is the size of a fountain pen.
The way a laser projection keyboard works is very interesting, infra-red technology and laser is used to make a keyboard that is totally virtual, and the hologram is projected on a flat surface.