The pocket-sized device projects a full-size two-dimensional keyboard onto any flat surface, wirelessly communicating with the host device. The BTVKB keyboard is manufactured and master distributed by i.Tech Dynamic Limited, a subsidiary of Hutchison Harbour Ring Limited
The BTVKB uses three modules to create the keyboard technology: the projection module, the illumination module and the sensor module. The first module projects the keyboard image onto the adjacent surface using a red laser diode and highly efficient diffractive optical element. The illumination module projects an infrared beam of light just above the keyboard surface. This light is invisible to the user and hovers a few millimeters above the surface. The sensor module detects the interaction of the finger with the IR beam. It receives this information, interprets the keystrokes and communicates them back to the external device (PDAs, mobile phones, etc.).
