Narrow array capacitive fingerprint imager

摘要

A narrow array capacitive semiconductor fingerprint detection system includes an array of capacitive sensing elements with a first dimension about the width of a fingerprint and second dimension less than the length of a fingerprint. A scan control unit is coupled to scan the array at a rate determined by the speed of finger movement. The scan control unit scans the array capture partial fingerprint images. Output logic is coupled to the array to assemble the captured fingerprint images into a complete image based upon the direction of finger movement. A mouse is positioned adjacent the array in the path of finger movement and is coupled to provide finger movement speed information and finger movement direction information. <IMAGE>