Wall-size touch screens

Kate Greene shares his views on some of the advancements in the field of multi-touch display screens. Experts state that the multi-touch display screens allow a person to use multiple fingers to do things like zoom in and out of pictures. Jeff Han, research scientist at New York University's Courant Institute of Mathematical Sciences, has developed an effective way to make large, very high-resolution screens that accommodate 10, 20, or even more fingers. Applications can include interactive white boards, touch-screen tables, and digital walls. A digital projector shines an image on a six-millimeter-thick clear acrylic screen in his setup. Touch sensitivity comes from infrared light-emitting diodes attached to the edges of the screen. The light diffuses at the point of contact and scatters outside the surface after fingers or other objects touch the acrylic screen.