Abstract: The present disclosure relates to an electronic display device for detecting and validating an object by optical sensing, comprising a display panel having light emitting pixels to display images, a top transparent surface formed over the display panel as an interface for being touched by a user for touch sensing operations, an optical sensor module located under the display panel or It integrated in the display panel comprising a sensor array of optical detector pixels configured for 1) receiving light reflected from the object on the surface of the display panel, and 2) generating image data according to the received light.

Abstract: The present disclosure relates to a method for fabrication of an optical sensor for use in an image recognition device, e.g. a biometric imaging device, such as a fingerprint detector, for use in under-display applications. The presently disclosed method provides a cost-efficient fabrication process, preferably employing nanoimprint lithography, for realizing an optical sensor with improved light transmittance in a compact and cost-efficient structure. In particular the presently disclosed image recognition device can be placed under a display panel of an electronic device, such as a smartphone.

Abstract: The invention provides an optical coupling system having first and second back-to-back GRIN lenses each having an input and an output end face, an optical filter element disposed between the first and second back-to-back GRIN lenses, an input optical fiber tube having two optical fibers therein adjacent to and optically coupled with the first of the back-to-back GRIN lenses, an output optical fiber tube having an optical fiber therein adjacent to and optically coupled with the second of the back-to-back GRIN lenses, wherein an inwardly facing end face of the output optical fiber tube and the output end face of the second of the back-to-back GRIN lenses are non-parallel to each other for reducing coupling losses. The optical coupling system is supported in glass holding tubes.