One of several approaches to making that happen uses a quantum tunneling composite—quantum tunneling happens when you bring two conductors close together, but with an insulating layer still between them, and electrons jump between the two conductors. Peratech's way to do this is with a polymer that changes resistance as you apply force for the insulating layer, so that bottom line, screens using this tech can tell how hard you pressing on the screen, since the sensors are able tell within two micrometers of how far in the screen's bending.
While there's other tech out there for pressure-sensing screens, Peratech says their tech uses less power and is more sensitive. The first gadgets with Peratech's sauce is coming out as early as April, so we'll able to poke things with that much more intent. Though, I have a hard enough time hitting the right stuff on screen—now I'm gonna have to keep track of how hard I press? Hrm. [MIT via Engadget]
