Patent ID: 9613247
Date: 2017-04-04
CPC Classifications: G01D,G01R,G06K,H03K

Claim:
1. A sensing method of a fingerprint sensor to sense an electrode plate to be measured of the fingerprint sensor, comprising steps of: (a) in a first phase, supplying a first voltage to a first node connected to the electrode plate to be measured, supplying a second voltage to a second node, and supplying a third voltage to a conductor adjacent to the electrode plate to be measured, wherein the first voltage minus the second voltage leaves a non-zero value and the first voltage is larger or smaller than the second voltage; and (b) in a second phase, stopping supplying the first, second and third voltages to the first, second and third nodes, supplying a fourth voltage to the conductor, connecting the first node to the second node, wherein a voltage of the second node corresponds to a measurement result of the electrode plate to be measured, wherein when the first voltage is larger than the second voltage and the third voltage is larger than the fourth voltage, or when the first voltage is smaller than the second voltage and the third voltage is smaller than the fourth voltage.