TECHGuru

  A virtual keyboard can be defined as a device or technology that employs computer software for on screen keyboard or keyboard projected with the help of LASER or LED light on a non-reflecting surface. A keyboard is projected on a surface and the key-press is detected with the help of optical detectors. Moreover, advanced technologies such as on screen keyboard uses resistive or capacitive touch screen to detect the key-press. Amongst the two technologies used in the virtual keyboards, the projected type of virtual keyboard uses a wireless module connected to a phone or PDA through Bluetooth or Wi-Fi technology which incorporates a source of light to project the image of the standard keyboard on a non-reflective surface and sensor or detector to detect the motion of fingers. Whenever, a user moves his fingers on the projected image, the detector sends a signal based on the touch to the controller incorporated in the wireless module, thereby detecting a key press. However, the othe...