Projected capacitivetouchscreens consist of a charged matrix, or field, of columns and rows that are read or scanned by the microcontroller. When a finger or stylus interacts with thescreen, the microcontroller can “read” thetouchpoint because of “mutualcapacitance.
Capacitive Touch Screen
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Capacitive. These screens are made from multiple layers of glass. The inner layer conducts electricity and so does the outer layer, so effectively the screen behaves like two electrical conductors separated by an insulator—in other words, a capacitor. ... In a capacitive touchscreen, the whole screen is like a capacitor.
