Synaptics Incorporated
Optical biometric sensor with automatic gain and exposure control

Abstract:

An optical imaging device for imaging a biometric input object is disclosed. The optical sensor includes an array of sensing elements. The optical sensor is configured to read a subset of sensing elements in the array of sensing elements; analyze the reading of the subset of sensing element to determine if one or more sensing elements of the subset is saturated; alter an operating point of the optical imaging device; and image the input object.