Ultrasonic fingerprint sensor with a contact layer of non-uniform thickness
摘要
說(shuō)明書(shū)
In one embodiment, fingerprint sensor 415 includes processor 460 for performing the pixel capture, where pixel capture is performed using subsets of ultrasonic transducers (e.g., PMUTs) of fingerprint sensor 415. In some embodiments, pixel capture for groups of pixels is handled the same, such that the groups of pixels utilize same imaging operations (e.g., utilize a same relative activation of the first subset of ultrasonic transducers and the second subset of ultrasonic transducers according to a same local angle). In other embodiments, processor 460 can perform at least some signal analysis, e.g., thresholding, to determine whether an object has interacted with fingerprint sensor 415. In other embodiments, processor 460 can analyze captured pixels and determine whether the object has characteristics of finger, e.g., a pattern resembling the ridge/valley pattern of a fingerprint. In other embodiments, processor 460 can capture an image of the fingerprint and forward it to a processor of system circuitry for further analysis.
