US Patent 11289533 Biometric sensor and methods thereof

A method of fabricating a sensing apparatus is disclosed. The method includes providing a substrate that includes a plurality of image sensors, forming an optical filtering film on the substrate, and forming a collimator on the optical filtering film. The method further includes forming a blocking layer on the collimator and forming an illumination layer on the blocking layer. The illumination layer is configured to illuminate an object placed above the illumination layer. The image sensors are configured to detect a portion of light reflected from the object.