Patent ID: 9129143
Filing Date: 2015-09-08
Classification: G06K

Abstract:
1. A finger sensing structure for a capacitive fingerprint recognition IC, comprising: a plurality of sensing electrodes, formed an array to define a sensing area; a capacitive sensing layer, covered the plurality of sensing electrodes; a functional metal layer, disposed on a upper surface and a lower surface of the capacitive sensing layer and included a plurality of fishbone-like structures, wherein the plurality of fishbone-like structures are distributed between gaps of the plurality of sensing electrodes or distributed in peripheries of the plurality of sensing electrodes, wherein the functional metal layer comprises a finger sensing metal unit and an ESD protecting metal unit, and the finger sensing metal unit and the ESD protecting metal unit comprise part of the plurality of fishbone-like structures, respectively; a common conductive layer, connected to the plurality of fishbone-like structures and surrounded the sensing area to transfer signals, wherein the common conductive layer comprises a finger sensing conductive unit and an ESD protecting conductive unit, which are electrical insulated to each other, and the plurality of fishbone-like structures of the finger sensing metal unit and the plurality of fishbone-like structures of the ESD protecting metal unit are electrical connected to the finger sensing conductive unit and the ESD protecting conductive unit, respectively; a signal processing circuit, disposed under and electrical connected to the plurality of sensing electrodes; an insulating layer, disposed between the plurality of sensing electrodes and the signal processing circuit; and a protecting layer, covered the upper surface of the capacitive sensing layer, wherein