Howstuffworks “How the iPod Touch Works”
2007/09/17/1201 by farkingaRTFA: http://electronics.howstuffworks.com/ipod-touch.ht…
The thing that sets the iPod touch apart from other iPod models is its touch-screen interface. When you touch the screen, the iPod’s circuitry detects the presence of your finger. It keeps track of how many fingers you have on the screen and where you move them.
The iPod touch does this using a layer of capacitive material under a protective covering. You can read How Capacitors Work to learn more about them, but the basic idea involves taking advantage of the electrical properties of the human body. When you touch a capacitive surface, the amount of charge it holds changes. This is why devices like the iPod touch require you to touch them with your bare skin — insulating materials like gloves, pens and styluses don’t cause the same changes in the capacitive circuitry.
Neat - once they get done with the advertisement…
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