Patent ID: 8624873

Claim:
A method for detecting a touch spot of a touch panel, the touch panel comprising a conductive film and a plurality of electrode pairs, the conductive film defining a first impedance direction and a second impedance direction substantially perpendicular to the first impedance direction, the plurality of electrode pairs being arranged along the first impedance direction, each of the plurality of electrode pairs comprising a first driving electrode and a second driving electrode separately located on two opposite sides of the conductive film, the method comprising: scanning the plurality of electrode pairs along the first impedance direction to obtain a plurality of electrical signals for determining a first coordinate of the touch spot; selecting a plurality of electrode pairs near the first coordinate to obtain an electrode pair signal P sum ; scanning first driving electrodes of the plurality of selected electrode pairs to obtain a first signal M sum ; scanning second driving electrodes of the plurality of selected electrode pairs to obtain a second signal N sum ; and determining a second coordinate of the touch spot according to the electrode pair signal P sum , the first signal M sum , and the second signal N sum by the sub-steps of: determining a second coordinate Y=y, when P sum ≦abs(N sum −M sum ) and N sum ≧M sum , determining a second coordinate Y=0, when P sum ≦abs(N sum −M sum ) and N sum <M sum , determining a second coordinate by a formula y - y 2 × P sum - ( N sum - M sum ) P sum , when P sum >abs(N sum −M sum ) and N sum ≧M sum ; and determining a second coordinate by a formula y 2 × P sum - ( M sum - N sum ) P sum , when P sum >abs(N sum −M sum ) and N sum <M sum , wherein abs represents an absolute value, and y represents a distance between the two opposite sides along the second impedance direction.