projected capacitive sensors, theory and design.(Touchscreen explained)

This video explains the physics behind the electrodes of the projected capacitive sensors. The typical touch-signal int the projected sensors starts with a initial capacitance, dips and the shoots up as the finger moves towards the electrodes. This unique response characteristic is counter-intuitive and cannot be explained by circuit theory alone. This video shows that the signal comprises 3 components, caused by the cross-component influence, the parallel plate capacitance and the initial coupling. Once the physics is understood, the design method naturally follow.

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