Touch panel sensor with optimal electrode separation for improved performance

A touch panel display comprising:

• a display panel comprising a plurality of pixel regions that emit light;
• and
• a touch sensor comprising an electrode configuration that is configured as an opaque metal mesh that overlays the display panel with the opaque metal mesh being positioned outside of the pixel regions;
• the electrode configuration comprising a first electrode and a second electrode that are separated by an insulating region, an electrode separation distance being a distance between the first electrode and the second electrode across the insulating region in a direction perpendicular to opposing faces of the first and second electrodes;
• and
• wherein the electrode separation distance is in a range whereby (1) with increasing electrode separation distance a first rate of proportional decrease in mutual capacitance between the first and second electrodes is greater than a second rate of proportional decrease in signal magnitude of an output signal, and (2) a ratio (R) of the first rate to the second rate satisfies the relationship 1.0<R<2.5.