HOW DOES PROJECTED CAPACITIVE TOUCH TECHNOLOGY WORK?
In most cases, projected capacitive touch sensors are made up of three major components: the sensor glass, cover glass, and flexible printed circuit with controller. The sensor glass is made up of a series of electrodes, composed of a transparent conductive coating, that are configured into rows and columns. Each electrode is routed back to a connected point where the circuit can be bonded. The flexible printed circuit typically contains the controller for the touch sensor.
The cover glass buries the electrodes within a stack of lamination, and serves as a dielectric between your touch and the electrodes of the sensor glass. The cover glass also serves as a barrier layer- protecting the sensitive electrodes from environmental and human damage.
By using complex algorithms to pull a small charge from the electrodes, the controller can determine the exact location of your touch. As a result, when your finger touches the surface of the cover glass, the controller can scan and monitor the electrodes it produces.