Touch screen, portable electronic device, and method of operating a touch screen

A portable electronic device, comprising:

• a main body comprising a housing having a bottom surface, the housing forming a recess in the main body;
• and
• a touch screen responsive to a touch action and being arranged in the housing, the touch screen comprising:
• a display for displaying through a front surface of the display, wherein the display is mounted inside the housing and further comprises a back surface being offset by a gap from the bottom surface of the housing in a direction perpendicular to the bottom surface;
• a sensor system being interposed between the back surface and the bottom surface, the sensor system comprising:
• a first electrode assembly comprising at least one electrode, and
• a second electrode assembly comprising at least one electrode,
• the sensor system being configured to sense a capacitance between the first electrode assembly and the second electrode assembly;
• and
• a processor, the processor being configured to determine, based on the sensed capacitance, a force resulting from the touch action, wherein the processor is further configured to control at least one function of the portable electronic device based on the determined force.