Optical biometric sensor with automatic gain and exposure control
AssigneeSynaptics Incorporated
InventorsRobert J. Gove, Alvin Jee
Life of this patent
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Abstract
An optical imaging device for imaging a biometric input object is provided. The optical imaging device includes an optical sensor having an array of sensing elements. The optical sensor is configured to first read a first subset of sensing elements in the array of sensing elements; analyze the first read of the first subset of sensing elements to determine an ambient light condition; first alter an operating point of the optical imaging device based on the ambient light condition; and image the input object.
Claims20
An optical imaging device for imaging an input object, comprising:
- an optical sensor array including an array of sensing elements;
- and
- a control circuit, wherein the control circuit is configured to:
- first read a first subset of sensing elements in the array of sensing elements, wherein the first subset of sensing elements comprises less than all sensing elements in the array of sensing elements;
- analyze the first read of the first subset of sensing elements to determine an ambient light condition;
- first alter an operating point of the optical imaging device based on the ambient light condition;
- and
- image the input object.
A method of imaging an input object using an optical sensor array having a plurality of optical sensing elements, comprising:
- first reading a subset of sensing elements in the optical sensor array, wherein the subset of sensing elements comprises less than all sensing elements in the plurality of optical sensing elements;
- analyzing the first reading of the subset of sensing elements to determine an ambient light condition;
- altering an operating point based on the ambient light condition;
- and
- imaging the input object using the optical sensor array.
An electronic device, comprising:
- an optical sensor array including an array of sensing elements;
- and
- a control circuit, wherein the control circuit is configured to:
- read a subset of sensing elements in the array of sensing elements, wherein the subset of sensing elements comprises less than all sensing elements in the array of sensing elements;
- analyze the read of the subset of sensing elements to determine an ambient light condition;
- alter operation of the electronic device based on the ambient light condition.
Dependencies are inferred from the claim text.