A mobile device for detecting user input on a display, the mobile device comprising a hand-held display unit comprising: a display having a plurality of electromagnetic radiation emitters configured to emit electromagnetic radiation in a direction away from the display; a plurality of electromagnetic radiation detectors (Di) configured to detect an electromagnetic radiation profile; characterized in that the display further comprises a refractive medium; wherein an electromagnetic radiation emitter of the plurality of electromagnetic radiation emitters (E i) is configured to emit electromagnetic radiation in a direction toward the refractive medium; and the refractive medium is configured to reflect electromagnetic radiation in a direction toward an electromagnetic radiation detector of the plurality of electromagnetic radiation detectors (D i) in an absence of contact from a user input object and to change a direction of reflected electromagnetic radiation responsive to contact from the user input object; and a controller configured tc detect a contact region by identifying areas in which detectors detect a reduced amount of the reflected electromagnetic radiation; identify a user input from the electromagnetic radiation profile; display an icon on the display responsive to the detection of electromagnetic radiation reflected from a user input object in a direction toward the display when the user input object is spaced apart from the display; track movement of the user input object by displaying the icon in a region responsive to movement of the user input object when the user input object is spaced apart from the display; and to perform an operation responsive to contact of the user input object with the display. a display having a plurality of electromagnetic radiation emitters configured to emit electromagnetic radiation in a direction away from the display; a plurality of electromagnetic radiation detectors (Di) configured to detect an electromagnetic radiation profile; characterized in that the display further comprises a refractive medium; wherein an electromagnetic radiation emitter of the plurality of electromagnetic radiation emitters (E i) is configured to emit electromagnetic radiation in a direction toward the refractive medium; and the refractive medium is configured to reflect electromagnetic radiation in a direction toward an electromagnetic radiation detector of the plurality of electromagnetic radiation detectors (D i) in an absence of contact from a user input object and to change a direction of reflected electromagnetic radiation responsive to contact from the user input object; and a controller configured tc detect a contact region by identifying areas in which detectors detect a reduced amount of the reflected electromagnetic radiation; identify a user input from the electromagnetic radiation profile; display an icon on the display responsive to the detection of electromagnetic radiation reflected from a user input object in a direction toward the display when the user input object is spaced apart from the display; track movement of the user input object by displaying the icon in a region responsive to movement of the user input object when the user input object is spaced apart from the display; and to perform an operation responsive to contact of the user input object with the display. detect a contact region by identifying areas in which detectors detect a reduced amount of the reflected electromagnetic radiation; identify a user input from the electromagnetic radiation profile; display an icon on the display responsive to the detection of electromagnetic radiation reflected from a user input object in a direction toward the display when the user input object is spaced apart from the display; track movement of the user input object by displaying the icon in a region responsive to movement of the user input object when the user input object is spaced apart from the display; and to perform an operation responsive to contact of the user input object with the display.