A sensor grid measures capacitance
Electronics monitor tiny changes at crossing points.
A finger changes the local electrical environment
Human tissue conducts enough to alter the measured capacitance.
Software locates the touch
The controller estimates position and sends coordinates to the operating system.
Not every object works the same way
Ordinary gloves or nonconductive styluses may not create the needed electrical change.
This page explains scientific concepts for general learning. It does not replace laboratory safety procedures, professional engineering guidance, or individualized medical advice.