How does the Capacitive touchscreen work?
iPhones, iPads, Samsung Galaxy smartphones, and Amazon’s Kindle Fire, to name a few, use the “capacitive” method. These electronic devices monitor changes in electrical currents running through the screens. The touchscreens include a layer of capacitive, or electricity-storing, material. The capacitors in the screen are arranged according to a coordinate system, creating a grid. The circuitry inside the screen can then sense changes in electrical charge at each point along the grid. As a result, every individual point on the grid generates its own signal when touched, which is then relayed back to the device’s processor, allowing the device to recognize multiple points of contact.