A smooth sheet of glass somehow knows exactly where your finger lands — and tracks ten at once. This short course explains the trick: your screen holds a faint electric charge, your conductive finger pulls a little of it away, and a hidden grid of transparent electrodes reads off where. It also covers why ordinary gloves fail, why water causes phantom taps, and how older resistive screens work differently.
A smooth sheet of glass somehow knows exactly where your finger lands — and tracks ten at once. This short course explains the trick: your screen holds a faint electric charge, your conductive finger pulls a little of it away, and a hidden grid of transparent electrodes reads off where. It also covers why ordinary gloves fail, why water causes phantom taps, and how older resistive screens work differently.
