![]() ![]() When you apply pressure, it makes the sheets touch together, and the touchscreen hardware can find where that contact point is. The older resistive touchscreens just had two flexible conductive sheets with a gap in between them. ![]() That's why it can tell different fingers, and the more sensitive screens can tell fingers apart by their shape, and make a guess at how hard you're pressing. The screen can tell all the points where the charge is disturbed in this way, building up a picture of where you're touching it. The screen has a charge inside it, and when your finger comes near it, the capacitance of your finger attracts this charge. They work a bit like the way you can feel a static charge with the hair on your skin. Today's multi-touch screens are capacitive, unlike the resistive touchscreens from a decade ago. Capacitive and resistive touchscreen technologies
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