eli5 how do touch screens know where you are touching?
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Most touchscreens these days use something called “capacitive touch”.
Every pixel has some electricity being pushed in and out of it over and over again, quite fast. When your finger is near a pixel, it makes this easier to do, as the electrons in your finger can (sort of) freely move.
The screen detects how easy it is to move electricity in a particular pixel, and so it knows which pixel your finger is near.
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