The capacitive touchscreen provides sensitive, accurate, light-touch control for electronic devices, such as the Apple iPhone and iPod. The capacitive touchscreen features a sandwich construction including a top layer of a transparent conductor, such as indium tin oxide, an insulating glass layer, and an LCD display layer.
A person's finger is a conductor, and so disturbs the electrostatic field at the surface of the touchscreen, which is sensed and then interpreted as a control motion by the electronic device. Touchscreens enable multi-touch, which may, for example, enlarge or shrink a map display with a pinching motion.
Capacitive touchscreens provide a high-quality control experience, because they work with a wide range of finger pressure, and are sensitive to multi-touch inputs.