Camera Optical Touchscreens

NextWindow's optical touch screen technology uses two line scanning cameras located at the corners of the screen. The cameras track the movement of any object close to the surface by detecting the interruption of an infra-red light source. The light is emitted in a plane across the surface of the screen and can be either active (infra-red LED) or passive (special reflective surfaces).

At the heart of the system is a circuit board called the the Digital Signal Processor (DSP). The DSP receives signals from the cameras and runs software that compensates for optical distortions and triangulates the position of the finger (or any object) extremely accurately.