A unit to provide both force and location detection includes a first
transparent substrate (having first and second sets of conductive traces
oriented in a first direction), a second transparent substrate (having a
third set of conductive traces oriented in a second direction) and a
plurality of deformable members (e.g., rubber beads) arranged between the
first and second transparent substrates. The first set of conductive
traces, in combination with the conductive traces of the second
transparent element, provide a capacitance signal representing where a
user touches the display element. The second set of conductive traces, in
combination with the conductive traces of the second transparent element,
provide a capacitance signal representing the amount of force applied to
the display element. When used with a display element (e.g., a LCD or
CRT), an input-output unit capable of both location sensing and force
sensing operations is provided.