Had been wondering how capacitive touch screens work on Thursday and had been wondering why I had not read about it already. Having read about it on How Stuff Works on Thursday, I thought of this on my way home from work last night when it was 36 degrees outside.
To know how the aluminium foil works, checkout this link that describes how capacitive touch screens work http://electronics.howstuffworks.com/iphone1.htm.
Simply put, the screen has an electric charge mapped on the surface. When a conductive material makes contact it changes the electric charge at that point and the device recognizes it as a point of contact. You can use any large enough piece of metal to make contact with your touch screen phone. My phone has a screen protector so the foil did not scratch the screen.
But you don’t have to carry aluminium foil with you – there are lots of touch screen compatible gloves flooding the market http://bit.ly/hOrHcE.
Cheers and happy wintery touchscreeny holidays!