Projection keyboard
From Wikipedia, the free encyclopedia
A projection keyboard is a virtual keyboard that can be projected and touched on any surface. The keyboard watches your fingers move and translates that action into keystrokes in the device. Most systems can also function as a virtual mouse. A proposed system called the P-ISM will combine the technology with a small Video projector to create a portable computer the size of a fountain pen.[1]
How a projection keyboard works:
- Laser projects visible virtual keyboard onto level surface.
- Invisible infared beam is projected above virtual keyboard.
- Finger makes keystroke on virtual keyboard. This breaks infared beam and infared light is reflected back to projecter.
- Reflected infared beam passes through infared filter to camera.
- Camera photographs angle of incoming infared light.
- Sensor chip determines where infared beam was broken and translates it into co-ordinates.
- Characters are created on screen, using co-ordinates sent wirelessly.
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