How does touch screen work and why do screen protectors not stop touch screen from working?
In: Technology
There are generally two kinds
**Resistive touchscreens** are sort of version one and were really the only kind of touch screen before the iphone. They have 2 layers, a flexible top layer and a hard under layer. They both have a thin coat of metal to conduct electricity. When push down on the flexible outer layer, the two metal coats connect and cause a change in voltage. Some fancy math is done to translate the voltage change to a spot on the screen.
They’re affordable and durable, but can’t detect multi touch.
**Capacitive touchscreens** uses the human body’s natural capacitance, i.e. your body can conduct electricity and can store electric charge. These touchscreens only have one metal coated layer. This time it’s your finger disturbing the charge in that layer that allows it to detect where you’re touching. Don’t worry though, no electricity is going through your finger.
It’s a bit more complicated. Sci show made a pretty good (https://www.youtube.com/watch?v=wKuqNuzM1oM) going more in depth, and it’s what i based my answer on
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