Optical fingerprint sensor with force sensing capability

An electronic device having an optical fingerprint sensing module, comprising:

• a display panel that displays images and contents and receives user contact inputs;
• and
• an optical sensor module placed underneath the display panel and configured to detect a presence of a received contact input associated with a fingerprint to generate a first signal indicative of an image of a spatial pattern of the fingerprint and a second signal indicative of a biometric marker that is different from the spatial pattern of the fingerprint and represents a property of a live person, the optical sensor module including an optical sensor array positioned to receive reflected probe light that carries information of the received contact input and to produce an optical sensor signal,
• wherein the optical sensor module captures different fingerprint patterns at different times to monitor time-domain evolution of the fingerprint ridge pattern deformation that indicates time-domain evolution of a press force from the contact input, and
• wherein the optical sensor module is structured to measure the reflected probe light at two or more different wavelengths to compare extinction ratios of the reflected probe light at the two or more different wavelengths as the second signal indicative of whether the received contact is from the live person.