how phone screen work
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An electrical current runs through the two layers while the monitor is operational. When a user touches the screen, the two layers make contact exactly at that spot. ... When a user touches the monitor with his finger, some of the charge is transferred to the user, so the charge on the capacitive layer decreases.
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Capacitive touch screens
Capacitive screens are made up of multiple layers of glass and plastic, coated with a conductor material like indium tin oxide or copper. This conductive material responds when contacted by another electrical conductor, like your bare finger.
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