If I understand this correctly, on a touch screen, you have a a grid based system where the rows and columns are either driving or receiving. When you touch the screen a mutual capacitance arises between the driving and receiving node. How exactly does that capacitance get read out into an (x,y) coordinate on the screen? To be more specific, once the mutual capacitance is induced, how is the signal read out, what does it go through to translate into an x,y position?


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