Patent ID: 8164582

Claim:
A method for using a touch display system, comprising: defining local distortion zones within regions of a touchscreen, each of the local distortion zones having an associated calibration touch point and associated distortion distance therefrom and an associated target, wherein the associated calibration touch point comprises linearity corrected coordinates; determining a first discrepancy vector between a first calibration touch point and a first target associated with a first local distortion zone; computing a weighting factor based on a location of a user touch point within the first local distortion zone; computing an amount of the first discrepancy vector based on the weighting factor, the amount being a local distortion offset; and distorting linearity corrected coordinates of the user touch point within a first local distortion zone based on the location of the user touch point within the first local distortion zone, the amount being applied to distort the linearity corrected coordinates of the user touch point; wherein the local distortion offset is monotonically decreased for linearity corrected coordinates of user touch points that are further away from the first calibration touch point.