At Carnegie Mellon are working tactile surfaces that can be pressed as buttons but at the same time allowing for changes that provide the interface screens. This buttons are covered by using latex-filled air that protrude from the surface of the screen. With these buttons you can give users a tactile response as you can vary the pressure off when we want.
The screens are covered with a latex semi placed on an acrylic plate with some holes and a tube connected to a pumping system. When the pump is off the screen is flat and when the pump is turned creating a concave or convex forms around the cutting of the plate, depending on the pressure is positive or negative.
It seems a good alternative especially when it is necessary to be sure that a button was enabled without the need to look at, this is achieved with the response given by the touch buttons common now applied to touch screens.
Via: TechnologyReview
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