i’m mostly curious about what exactly happens inside of your finger when you touch the touch screen on your phone, does electricity enter your finger or does the electricity in your finger enter your phone?
In: Technology
The charge comes from the screen. The screens are layered with an electrically conductive transparent material called iron tin oxide. When your finger (or any conductor) touches the screen, a very small amount of charge gets moved to your finger, and this causes a voltage drop at that part of the screen. This small, localized voltage drop is how the screen knows what part of the screen you touch. There are a couple different ways that different screens detect where the voltage drop is. But that’s the gist of it.
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