Patent ID: 8773401

Claim:
A touch input device comprising: a touch panel receiving a touch trace formed by touching the touch panel, wherein the touch trace comprises at least one touch point; a driving and sensing circuit driving the touch panel and sensing an actual signal value V i of the at least one touch point, wherein if an actual contact area A i of the at least one touch point is a basic contact area A o , the actual signal value V i of the at least one touch point is V oi ; a data memory storing a look up table comprising a plurality of position coordinates on the touch panel and a plurality of calibrating rules f, each of the calibrating rules f corresponding to each of the position coordinates, and used to convert V oi of the at least one touch point of the basic contact area A o in the position coordinate to a standard signal value Vs, wherein the converting process is represented by f(V oi )=V s , the calibrating rules f performing a function of V oi ; and a processor calculating the position coordinate and calibrating the actual signal value V i of the at least one touch point to a calibrated signal value V′ i by a corresponding calibrating rule f, wherein the calibrating process is represented by f(V i )=V ′i , and wherein the calibrated signal value (V ′i ) is related to the actual contact area of the at least one touch point, and unrelated to the position coordinate of the at least one touch point.