The various features of full-size projection keyboard designed to improve the functionability of handheld devices are discussed. The efficacy of these keyboards is high as it might replace laptops and mechanical keyboards, making the machines more thinner and lighter. With a projection keyboard, sound feedback is possible and contact with a key carries the information of impact with an inert surface. The components of these keyboards which includes a projector, an infrared light source and a sensing system feels like a mechanical keyboard even if users feel only the impact of their fingers on the projection surface while typing.