Optical sensing of fingerprints or other patterns on or near display screen using optical detectors integrated to display screen

An electronic device capable of detecting a fingerprint by optical sensing, comprising:

• a display panel that includes light emitting display pixels operable to emit light for displaying images;
• a top transparent layer formed over the display panel as an interface for user touch operations and for transmitting the light from the display panel to display images, the top transparent layer including an optical sensing area that overlays with the display panel for a user to place a finger for fingerprint sensing;
• optical detectors that are spatially distributed across the light emitting display pixels and are spatially interleaved with the light emitting display pixels to provide optical sensing across the display panel, each optical detector operable to convert the received light that carries a part of a fingerprint pattern of the user into a detector signal and detector signals from the optical detectors collectively representing the fingerprint pattern;
• and
• optical collimation structures that are spatially distributed so that each optical collimation structure is coupled to a corresponding optical detector to spatially select incident light to be detected by the optical detector.