Optical fingerprint sensor under a display

An optical sensor system, comprising:

• an input surface providing a sensing region for a biometric object;
• a plurality of display elements, disposed beneath the input surface, configured to emit light to provide a display;
• a pinhole layer, comprising a plurality of pinholes, disposed beneath the plurality of display elements;
• and
• an image sensor, disposed beneath the pinhole layer, wherein the image sensor is configured to detect a plurality of sub-images corresponding to the biometric object, each sub-image of the plurality of sub-images being projected onto a plurality of pixels of the image sensor by a respective pinhole of the pinhole layer.

An optical sensor system, comprising:

• an input surface providing a sensing region for a biometric object;
• a plurality of display elements, disposed beneath the input surface, configured to emit light to provide a display;
• an aperture layer, disposed beneath the plurality of display elements, configured to diffract light from the plurality of display elements reflected from the sensing region;
• and
• an image sensor, disposed beneath the aperture layer, wherein the image sensor is configured to detect the diffraction patterns of the diffracted light.

A method for producing an optical biometric sensor for a display device, comprising:

• forming a display stack, wherein the display stack includes an input surface providing a sensing region for a biometric object and a plurality of display elements configured to emit light to provide a display, wherein the plurality of display elements are formed on a thin-film transistor (TFT) layer;
• forming a biometric object sensor, wherein the biometric object sensor includes a collimator layer and a plurality of light sensing elements;
• forming an aperture layer comprising a plurality of apertures;
• and
• attaching the biometric object sensor to the display stack;
• wherein the TFT layer comprises apertures in addition to the apertures of the aperture layer.

An optical sensor system, comprising:

• an input surface providing a sensing region for a biometric object;
• a plurality of display elements, disposed beneath the input surface, configured to emit light to provide a display, wherein the plurality of display elements are formed on a thin-film transistor (TFT) layer;
• an aperture layer, wherein the aperture layer is part of the thin-film transistor (TFT) layer and is disposed beneath the plurality of display elements;
• a collimator layer, disposed beneath the aperture layer;
• and
• a plurality of light sensing elements, disposed beneath the collimator layer, wherein the plurality of light sensing elements are configured to detect light from the sensing region that has passed through the aperture layer and the collimator layer.

An optical sensor system, comprising:

• an input surface providing a sensing region for a biometric object;
• a plurality of display elements, disposed beneath the input surface, configured to emit light to provide a display;
• an aperture layer, disposed beneath the plurality of display elements, wherein apertures of the aperture layer are non-circular, and the apertures are oriented such that sides of nearest adjacent apertures are not facing one another;
• a collimator layer, disposed beneath the aperture layer;
• and
• a plurality of light sensing elements, disposed beneath the collimator layer, wherein the plurality of light sensing elements are configured to detect light from the sensing region that has passed through the aperture layer and the collimator layer.

An optical sensor system, comprising:

• an input surface providing a sensing region for a biometric object, wherein the input surface is part of a cover lens;
• a plurality of display elements, disposed beneath the input surface, configured to emit light to provide a display;
• an aperture layer, disposed beneath the plurality of display elements;
• a collimator layer, disposed beneath the aperture layer;
• a plurality of light sensing elements, disposed beneath the collimator layer, wherein the plurality of light sensing elements are configured to detect light from the sensing region that has passed through the aperture layer and the collimator layer;
• and
• a polarizer film between the plurality of display elements and the cover lens.

An optical sensor system, comprising:

• an input surface providing a sensing region for a biometric object;
• a plurality of display elements, disposed beneath the input surface, configured to emit light to provide a display;
• an aperture layer, disposed beneath the plurality of display elements;
• a collimator layer, disposed beneath the aperture layer;
• and
• a plurality of light sensing elements, disposed beneath the collimator layer, wherein the plurality of light sensing elements are configured to detect light from the sensing region that has passed through the aperture layer and the collimator layer;
• wherein the collimator layer further comprises:
• a gap or a transparent layer;
• and
• a plurality of light-blocking structures forming a collimator beneath the gap or the transparent layer, wherein the plurality of light-blocking structures have heights of 100 um or less.