US 10,380,395 B2Granted

Optical sensor with angled reflectors

AssigneeSynaptics Incorporated

InventorsMarek Mienko, Patrick Smith, Arash Akhavan Fomani

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Abstract

Systems and methods for optical imaging using an optical sensor in an active area of the display are described. The optical sensor includes a set of detector elements positioned in a detector plane; a transparent layer; and a set of first reflective surfaces in the transparent layer. Each reflective surface in the first set of reflective surfaces is positioned to receive light from a portion of a sensing region of the display and to reflect the received light. The optical sensor further includes a second set of reflective surfaces, each reflective surface in the second set of reflective surfaces is positioned to receive the transmitted light from the first set of reflective surfaces, and to further reflect the received light towards one of the set of detector elements.

Claims17

Dependent claims

An optical sensor for imaging a biometric input object in an active area of a display, the optical sensor comprising:

a plurality of imaging cells, each imaging cell imaging a portion of the biometric input object to be imaged, each imaging cell further comprising:
a first detector element positioned in a detector plane;
a first reflective surface, the first reflective surface positioned to receive light from a first sensing region of the display and to reflect the received light;
a second reflective surface, the second reflective surface positioned to receive the reflected light from the first reflective surface, and to further reflect the light in a path that is substantially normal to the detector plane and towards the first detector element;
and
a blocking layer forming a plurality of apertures, wherein the first reflective surface receives the light from the first sensing region through at least one of the plurality of apertures, and wherein a width of the at least one of the plurality of apertures, a width of the first reflective surface, a width of the second reflective surface, and a photo-detector surface area of the first detector element combine to define an acceptance cone, wherein the acceptance cone corresponds to an area of the biometric input object.

3 more elements

A display including an optical sensor for imaging a biometric input object in an active area of the display, comprising:

a set of detector elements positioned in a detector plane;
a transparent layer;
a first set of reflective surfaces in the transparent layer, each reflective surface in the first set of reflective surfaces positioned to receive light from a portion of a sensing region of the display and to reflect the received light;
a second set of reflective surfaces, each reflective surface in the second set of reflective surfaces positioned to receive the reflected light from the first set of reflective surfaces, and to further reflect the received light in a path that is substantially normal to the detector plane and towards a detector element in the set of detector elements;
and
a blocking layer forming a plurality of apertures, wherein the first set of reflective surfaces receive the light from the sensing region through one or more of the plurality of apertures and wherein a width of the one or more of the plurality of apertures, a width of the first set of reflective surfaces, a width of the second set of reflective surfaces, and a photo-detector surface area of the set of detector elements combine to define acceptance cones, wherein each acceptance cone corresponds to an area of the biometric input object.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/283,007Filed 30 Sep 2016
Published: US 2018/0096186 A15 Apr 2018
Granted: 13 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H10F 39/8067
Optical elements or arrangements associated with the image sensors: reflectors
G06V 10/17
Image acquisition: using hand-held instruments
G06V 40/13
Fingerprints or palmprints: sensors therefor
G06V 40/1359
Preprocessing; Feature extraction: extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop