Patent ID: 8922517

Claim:
A method for detecting touch spot of a touch panel, the touch panel comprising: a substrate; a conductive film disposed on the substrate, wherein the conductive film is impedance anisotropic and defines a low impedance direction and a high impedance direction substantially perpendicular to the low impedance direction, the conductive film has a first side and a second side opposite to the first side, a direction from the first side to the second side is the low impedance direction; a plurality of first driving-sensing electrodes arranged along the first side and spaced from each other; a plurality of second driving-sensing electrodes arranged along the second side and spaced from each other; wherein the plurality of first driving-sensing electrodes and the plurality of second driving-sensing electrodes are electrically connected with the conductive film, each of the plurality of first driving-sensing electrodes and the plurality of second driving-sensing electrodes is electrically connected with a driving circuit and a sensing circuit, when the touch panel is touched by a conductive object at a touch spot, a coupling capacitance having a capacitance value C between the conductive film and the conductive object is formed, a resistance of the conductive film between a touch spot and each of the plurality of first driving-sensing electrodes is represented by R 11 , R 12 , . . . R 1n (n=1, 2, 3, . . . ), and a resistance of the conductive film between the touch spot and each of the plurality of second driving-sensing electrodes is represented by R 21 , R 22 , . . . R 2n (n=1,2,3 . . . ); the method comprising: inputting a pulse signal into each of the plurality of first driving-sensing electrodes by the driving circuit, and reading a R 1n C value detected by each of the sensing circuits, thereby simulating a first curve of R 1n C values along the high impedance direction to compute a coordinate of the touch spot at the high impedance direction; and inputting a pulse signal into each of the plurality of second driving-sensing electrodes by the driving circuit, and reading a R 2n C value detected by each of the sensing circuits, thereby simulating a second curve of the R 2n C values along the high impedance direction; and computing a coordinate of the touch spot at the low impedance direction by the first curve and the second curve.