Abstract :
IN THE SIX YEARS SINCE APPLE introduced the iPhone, with its stylus-free multitouch display, touch screens have become the preferred interface for mobile devices. Market demand for touch screens shows no signs of slowing. Last year´s worldwide revenues of US $16 billion are anticipated to jump to $31.9 billion in 2018, according to market research firm DisplaySearch. However, without the tactile feedback provided by buttons, it can be easy to lose a sense of where you are on the display or of data you have entered. Or you can accidentally enter data by just resting a finger on the screen.