Patent ID: 8338723

Claim:
A touch position detecting method comprising: generating touch data from a touch sensor array including a plurality of touch sensors; computing the touch data input in each of adjacent frames to generate difference data and then performing at least one binary operation and a filtering operation on the difference data to correct the difference data so that only a touch boundary portion has a black gray level; determining an effective area including outermost coordinates of the touch boundary portion in upward, downward, right and left directions and then calculating a first central coordinate indicating the center of black points in the touch boundary portion determined according to a distribution density of the black points and a second central coordinate indicating the center of the effective area; computing a reference vector between the first central coordinate and the second central coordinate, a position vector between a position coordinate on the touch boundary portion and the second central coordinate, and a plurality of angles between the reference vector and the position vector; and determining the position coordinate on the touch boundary portion at an angle having a minimum value among the plurality of angles as a touch coordinate.