An optical fingerprint sensor module includes a light source configured to provide illumination light directed toward a finger, a portion of the illumination light is scattered or reflected off of the finger, thereby generating signal light. The optical fingerprint sensor module further includes a photodiode array having a surface, a lens having an optical axis that forms an angle with respect to a normal of the surface of the photodiode array that is between 45 degrees and 135 degrees, a member defining a pinhole that is positioned off of the optical axis of the lens. The lens and pinhole are configured to focus the signal light onto the surface of the photodiode array. The optical fingerprint sensor module further includes electronic circuitries configured to process electrical signals generated by the photodiode array to produce an image of a fingerprint pattern of the finger.