Patent ID: 8026906

Claim:
A method for improving touch precision of an electronic device comprising a touch screen having a plurality of differential-force sensors mounted there beneath, a processor in communication with said plurality of differential-force sensors, and memory accessible by said processor, comprising the steps of: quantitatively determining coefficients of a polynomial force-resistance equation defining a non-linear force-resistance curve for said plurality of sensors; storing said determined coefficients in said memory; polling each of said plurality of differential-force sensors for a corresponding raw sensor reading and storing said raw sensor readings in said memory; calculating in said processor an actual force value from each of said plurality of differential force sensors using said polynomial force-resistance equation, determined coefficients, and raw force sensor readings, for linearization and homogenization of said raw force sensor readings; and calculating in said processor a coordinate position of a force applied to said touch screen based on all of the actual force values calculated for all of said plurality of differential force sensors.