Signal strength enhancement in a biometric sensor array

摘要

A biometric imager may comprise a plurality of sensor element traces formed in or on a sensor substrate which may comprise at least a portion of a display screen defining a biometric sensing area and forming in-active pixel locations; an auxiliary active circuit formed in or on the sensor substrate on the periphery of the biometric sensing area and in direct or indirect electrical contact with the sensor element traces; and providing a signal processing interface to a remotely located controller integrated circuit. The sensor element traces may form a portion of one dimensional linear sensor array or pixel locations in a two dimensional grid array capacitive gap biometric imaging sensor. The auxiliary circuit may provide pixel location selection or pixel signal amplification. The auxiliary circuit may be mounted on a surface of the display screen. The auxiliary circuit further comprising a separate pixel location selection controller circuit.

主权项

1. A biometric object image sensor comprising:
a plurality of capacitive gap sensor electrode traces formed on a glass substrate, wherein the plurality of capacitive gap sensor electrode traces form an array of biometric sensor imaging pixel locations within a biometric sensing area of the biometric image sensor, wherein at least one of the capacitive gap sensor electrode traces comprises a transmitter electrode trace and at least one of the capacitive gap sensor electrode traces comprises a receiver electrode trace, wherein a change in a resulting signal received by the receiver electrode trace is indicative of a biometric image characteristic at a respective pixel location in the array of biometric sensor imaging pixel locations; and a controller integrated circuit (IC) mounted to the glass substrate, wherein the controller IC is in electrical contact with the plurality of capacitive gap sensor electrode traces.