This may change the cold feel of a touch screen as we know it today. Our well-known company Microsoft applied for patent on a recent patent application with the title "Light-induced Shape-memory Polymer Display Screen". It uses a technique for a display that uses infrared light to detect touch, and also it can selectively change the topography of its layer, which will make a bumpy or smooth. This happens with projected light of certain wavelengths, which makes the layer to contract or expand. Read the original article here (NewScientist) and here (qikglance).