One reason why Apple’s touch sensor is so sensitive to light touch is that the company uses a 12-volt power source for the sensing lines in the touchscreen sensor, versus the 3- to 5-volt power source that most other component manufacturers have. That higher voltage drive takes a toll on the battery life because it uses up more power, but it also translates into more accurate sensing, which means a better touch experience, say researchers at Moto.

via Finger Fail: Why Most Touchscreens Miss the Point | Gadget Lab | Wired.com.