Some time ago we have agreed on a bachelor project with the Technical University of Winterthur (ZHAW) to work on a «Virtual Touch Screen» which is based on the concept of having two cameras taking images from the side of the surface to make it touch sensitive. By interpreting the positions of the finger within the two images and using triangulation, it is possible to figure out the x/y position of the finger on the surface.
We just got our 70″ SHARP PN-L702B LCD multi touch screen for demo purposes from Telion today. And it took us just a few minutes to get dizmo up and running on it. It based on invisible infrared sensors integrated with the screen and works with your fingers or with a pen that comes along if you want to sketch or write on the screen. The touch recognition resolution is good and really gives you this «pseudo-physical» feeling dizmo provides.
You might have seen the (semi-)transparent touch screens in science-fiction movies like Elysium, Iron-Man 2 or Avatar. Well, today we were able to see, touch and tape one of these screens live at the Telion showroom.