An introductary article on touchscreens. From the article you can know their history and how they work. I love the figure left illustrating how capacitive touchscreens work (including multi-touch touch screens). It elegantly describes the difference between traditional capacitve touch screens and those adopted in Apple iPhone. If you want to know more on multi-touch touchscreens, see how the iPhone works.
[Via Touch Usability]
Source: Touching the future, Economist.com, Sept. 4, 2008.
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