source :Quora
One of the nerdy thoughts that i have while looking at my handphone. How they actually work...not many years i think ~10 years ago, we still use those button type phone - Nokia comes to mind immediately. Sad thing about Nokia after being bought over by Microsoft.
"we didn't do anything wrong, but somehow, we lost"
Newer touch screen technologies are under development, but capacitive touch remains the industry standard for now (source)
The surface of a touchscreen is blanketed with a grid of electrodes. Wherever our finger comes to rest, a capacitive contact is formed and the AC current generated within the device induces a corresponding current within our body—which helps span the gap and complete the circuit.
If a grid location on the touchscreen is to sense the AC current, “there has to be a return [electrical] path,” For a touchscreen on a handheld device such as a smartphone, “you’re holding it with the other hand,” and this completes the electrical loop to the backside of the device, which is electrically grounded. If the touchscreen is part of an installation, such as an ATM, some part of our body is most likely in contact with an electrical ground. “It’s very hard (for our bodies) to avoid making a ground contact,” stresses Gershenfeld, which virtually guarantees that humans (or their fingers) can close an electrical loop for capacitive screens. (source)
By far Quora has more easy to understand feedback/answers from it's user/contributors. Others go too deep dive into details that can put readers to sleep in matter of minutes.
Interesting facts indeed hahaha.
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