Editing Touchscreen (section)

===Dispersive signal technology===
Introduced in 2002 by [[3M]], this system detects a touch by using sensors to measure the [[piezoelectricity]] in the glass. Complex algorithms interpret this information and provide the actual location of the touch.<ref>{{cite web|access-date=2009-03-16|url=http://www.fool.com/investing/general/2008/02/13/innovation-series-touchscreen-technology.aspx|title=Innovation Series: Touchscreen Technology|work=The Motley Fool|date=2008-02-13|last=Beyers|first=Tim|url-status=live|archive-url=https://web.archive.org/web/20090324195620/http://www.fool.com/investing/general/2008/02/13/innovation-series-touchscreen-technology.aspx|archive-date=2009-03-24}}</ref> The technology is unaffected by dust and other outside elements, including scratches. Since there is no need for additional elements on screen, it also claims to provide excellent optical clarity. Any object can be used to generate touch events, including gloved fingers. A downside is that after the initial touch, the system cannot detect a motionless finger. However, for the same reason, resting objects do not disrupt touch recognition.