The present invention provides a way to measure and track non-linear
corrections in touchscreens. Some or all of the relevant non-linear
corrections may be determined automatically. Production floor test
equipment may make electronic measurements, compute parameters, and load
the parameters in non-volatile memory of the controller electronics.
Alternatively, the controller electronics can make the electronic
measurements and determine non-linear parameters. The latter embodiment
of the invention permits the determination of non-linear parameters in
the field, dynamically tracking changes in the non-linear characteristics
of installed touchscreens that occur over time or due to environmental
conditions.