what does a digitizer do on a smartphone
The touch screen portion of the front glass of an iPod or iPhone is commonly called the digitizer in technical terms. The digitizer is a clear piece that is the size of the iPod LCD screen and spans the full length and width of the clear portion of the front glass. As you press on the front glass the digitizer converts analog signals generated by your fingertip into digital signals this is what produces the touch capability. The digitizer is typically fused to the front glass of such models as the iPod Touch and iPhone.