Display zoom controlled by proximity detection

A user device comprising:

• a touch screen display having a touch screen input, wherein the user device comprises a front side and a rear side of a single surface area, and wherein the touch screen display is located on the front side of the single surface area;
• a proximity detector arrangement located on the rear side of the single surface area, and wherein the proximity detector arrangement comprises a plurality of sensors for detecting a location of an input device by:
• detecting a capacitance change due to a distance change between the input device and the rear side of the user device;
• and
• producing a voltage change based on the detected capacitance change, the voltage change being linearly related to the distance change;
• a control unit comprising a processor, the control unit being configured to:
• receive data from the proximity detector to determine the location of the input device, including a value related to the distance from the input device to the rear side of the user device, the value comprising the voltage change;
• and
• control the display to perform a zoom function to enlarge or reduce the size of content on a portion of the display based on the value related to the distance from the input device to the display so that the size of content on the screen is enlarged from an initial size as the input device moves closer to the display and maintained as the enlarged size as the input device subsequently moves further from the display, the control unit being further configured to resize the content to the initial size in response to a further input on the user device;
• wherein the proximity detector arrangement and control unit are configured to detect the location of the input device within a detection volume and to provide a gradual variation in enlargement or reduction of the size of content as the distance from the input device to the rear side of the user device varies.