A projection keyboard is a virtual keyboard that can be projected to any length and touched on any surface. The keyboard makes clicking sounds as you run your fingers over the surface they are projected, and translates them into keystrokes in the device. They can also function as a virtual mouse.
You may be wondering how that works. Well, the whole setup comprises of a laser or a beamer and a sensor( usually a camera). The laser or beamer projects the visible virtual keyboard onto a level surface. The sensor detects the finger movements.
In addition to that usually a second radiation is used ( infrared radiation) and is projected over the virtual keyboard. When the fingers pass above the so created virtual keys, the infrared radiation is reflected back onto the projector and they pass into the camera through infrared filter. The camera determines angle of incoming radiation. A sensor chip included in the system detects time when the radiation was broken. The information thus collected is used for determining the characters produced by the keystrokes.
You may be wondering how that works. Well, the whole setup comprises of a laser or a beamer and a sensor( usually a camera). The laser or beamer projects the visible virtual keyboard onto a level surface. The sensor detects the finger movements.
In addition to that usually a second radiation is used ( infrared radiation) and is projected over the virtual keyboard. When the fingers pass above the so created virtual keys, the infrared radiation is reflected back onto the projector and they pass into the camera through infrared filter. The camera determines angle of incoming radiation. A sensor chip included in the system detects time when the radiation was broken. The information thus collected is used for determining the characters produced by the keystrokes.
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