Under-screen fingerprint reader

An optical reader apparatus configured to detect epidermal ridges of a body part using specular reflection contrast detection, the apparatus comprising:

• a display comprising a transparent cover and a first substrate comprising an array of active pixels, the active pixels serving as an illuminator of the apparatus;
• a pinhole array comprising a first pinhole mask with an array of first pinholes;
• an optical sensor optically coupled to the display via the pinhole array and comprising an array of photosensors disposed on a second substrate, in a non-overlapping arrangement with the first pinholes, in an offset relationship with respect to the array of active pixels and to the pinhole array such that individual pixels of the array of active pixels, individual pinholes of the pinhole array, and individual photosensors of the array of photosensors are in an offset relationship within one another, the array of photosensors configured to detect light reflected via specular reflection by the transparent cover;
• and
• a processor coupled to the display and the optical sensor, the processor configured to control illumination of selected active pixels and reading of signals from the photosensors in accordance with a predefined scanning pattern that covers a sensing region of the transparent cover during a body part reading operation.