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 method of imaging a biometric object comprising: utilizing a biometric image sensor, the biometric image sensor comprising:
a plurality of capacitive gap sensor electrode traces forming an array of biometric sensor imaging pixel locations within a biometric sensing area of the biometric image sensor, at least one of the sensor electrode traces forming a drive signal transmitter electrode and at least one of the sensor electrode traces forming a resulting signal receiver electrode trace, the respective drive signal transmitter electrode and respective resulting signal receiver electrode trace being formed on one of a single side of a first substrate and an opposite side of the first substrate; wherein a change in a resulting signal received by the at least one resulting signal receiver electrode trace is indicative of a biometric image characteristic at a respective pixel location in the array; utilizing a controller contained in an integrated circuit mounted to a second substrate remote from the biometric sensing area and in electrical contact with the sensor electrode traces; utilizing an intermediate logic circuit formed between the controller and the sensor electrode traces in the biometric sensing area, wherein the intermediate logic circuit is formed on at least one of the first substrate and a third substrate mounted to the first substrate, the intermediate logic circuit configured to control an activation sequence for a subset of the plurality of the capacitive gap sensor array pixel locations in response to a single signal from the controller to the intermediate logic circuit.