That Ars Technica article is amazing for what it does NOT include. . . it does a lot of talking to avoid mentioning ANYTHING at all about what transpired in 2006-2007 and skips over everything that happened there. It talks a lot about non-transparent input devices such as the Hot Air Ware DSI Handgear from 2002:
Then 2006 and the Ted Talk of Jeff Han on multi Touch on a table screen . . . using intersecting light beams from top and sides but no real user interface and drawing cool pictures. Whoop do doo. Then the article jumps to the Microsoft Big Ass Table in 2008. They then talk about Samsung and Microsoft's development partnership for PixelSense. . . in 2011.
Where is the development of the multi-touch capacitance screen by Apple in 2006 and 2007 and it's introduction with the iPhone on January 9, 2007 for which Apple holds all the patents????
Not one word, Diogenes. . . there are far more touch screen mobile devices from those patents, than were ever made than any of the things mentioned in this article and they devote one single sentence to them in this article in the last paragraph the article which talks about the development of the multi-touch for Android and iOS. Otherwise, not one single word in the entire article. This article you found is obviously about large scale touch screens, mostly optical grid, a few with resistance, a bone tossed to capacitance. . . and you could not even tell what you were looking at.