Patent ID: 8633717

Claim:
A method for determining impedance of depression, comprising: providing a plurality of intersecting regions constituted by a plurality of intersecting conductive stripes, wherein a pair of depressed conductive stripes intersected in an intersecting region from a contact point due to electrical contact so as to define a depressed intersecting region; and determining a contact impedance, wherein the contact impedance of each depressed intersecting region is determined based on the potentials at the contact point of one and the other of the pair of conductive stripes or the position of the contact point, wherein the determination of contact impedance further comprises: determining a first dimensional location and a second dimensional location of the contact point, and determining a first dimensional impedance and a second dimensional impedance based on the first dimensional location and the second dimensional location; detecting a first contact potential and a second contact potential of one and the other of the pair of conductive stripes when providing high and low potentials to one and the other of the pair of conductive stripes, respectively; and determining the contact impedance according to the first dimensional impedance, the second dimensional impedance, the high potential, the low potential, the first contact potential, and the second contact potential.