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US 8,274,051 B1Granted
Method and device for optoelectronic sensors with IR blocking filter
AssigneeTexas Advanced Optoelectronic Solutions, Inc.
InventorsCecil Aswell, Eugene G. Dierschke
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Abstract
Semiconductor structures for optoelectronic sensors with an infrared (IR) blocking filter and methods for using such sensors with post-detection compensation for IR content that passes through the IR blocking filter are provided herein.
Claims22
A method comprising:
- receiving, by a semiconductor device having first and second optoelectronic sensors formed therein, light having an infrared (IR) light component and a visible light component;
- filtering a portion of the IR light component from the received light using an IR blocking filter to exclude the filtered portion of the IR light from detection by the first and second optoelectronic sensors;
- filtering a portion of the visible light component using a first visible light filter to exclude a first set of visible light wavelengths from detection by the first optoelectronic sensor, wherein the first set of visible light wavelengths is not filtered for the second optoelectronic sensor;
- generating first and second sensor responses by the first and second optoelectronic sensors, respectively, wherein the first and second sensor responses represent the received light detected by the first and second optoelectronic sensors after filtering the IR light portion and the first set of visible light wavelengths;
- performing at least one calculation based on the first and second sensor responses to compensate for IR light remaining after filtering the IR light portion;
- and
- generating a third sensor response by a third sensor of the semiconductor device, wherein the third response represents the IR light component without filtering by the IR blocking filter.
4 more elements
A method comprising:
- providing a first IR blocking filter configured to block a first portion of IR light and to let a second portion of the IR light pass through, wherein the first IR blocking filter is positioned over a first optoelectronic sensor and a second optoelectronic sensor to block the first portion of IR light from reaching the first and second optoelectronic sensors;
- providing a first visible light filter configured to block a first portion of visible light and to let a second portion of the visible light pass through, wherein the first visible light filter is positioned over the first optoelectronic sensor to block the first portion of visible light from reaching the first optoelectronic sensor and is not positioned over the second optoelectronic sensor;
- obtaining a first response from the first optoelectronic sensor representing at least part of the second portion of the visible light and at least part of the second portion of the IR light detected by the first optoelectronic sensor;
- obtaining a second response from the second optoelectronic sensor representing at least part of the first and second portions of the visible light and at least part of the second portion of the IR light detected by the second optoelectronic sensor;
- obtaining a third response from a third optoelectronic sensor of the semiconductor device having no IR blocking filter associated therewith;
- and
- compensating for the IR light in the first and second responses to approximate a photopic response.
4 more elements
A device comprising:
- a first optoelectronic sensor configured to detect electromagnetic radiation in the visible light spectrum and the infrared (IR) spectrum and to generate a first response representing a spectral content of the detected electromagnetic radiation;
- a second optoelectronic sensor configured to detect electromagnetic radiation in the visible light spectrum and the IR spectrum and to generate a second response representing a spectral content of the detected electromagnetic radiation;
- an IR blocking filter integral to the device and positioned above the first and second optoelectronic sensors, wherein the IR blocking filter is configured to attenuate electromagnetic radiation in the IR spectrum;
- a visible light filter integral to the device and positioned above the first optoelectronic sensor, wherein the visible light filter is configured to attenuate electromagnetic radiation that falls within a first portion of the visible light spectrum;
- and
- a third optoelectronic sensor configured to detect electromagnetic radiation in the visible light spectrum and the IR spectrum and to generate a third response representing a spectral content of the detected electromagnetic radiation, wherein the third optoelectronic sensor is not associated with any IR blocking filter.
3 more elements
A device comprising:
- a first optoelectronic sensor configured to detect electromagnetic radiation in the visible light spectrum and the infrared (IR) spectrum and to generate a first response representing a spectral content of the detected electromagnetic radiation;
- a second optoelectronic sensor configured to detect electromagnetic radiation in the visible light spectrum and the IR spectrum and to generate a second response representing a spectral content of the detected electromagnetic radiation;
- an IR blocking filter integral to the device and positioned above the first and second optoelectronic sensors, wherein the IR blocking filter is configured to attenuate electromagnetic radiation in the IR spectrum;
- and
- a visible light filter integral to the device and positioned above the first optoelectronic sensor, wherein the visible light filter is configured to block all visible light and wherein the device further comprises circuitry for determining a ratio between the first and second responses, wherein the ratio represents a spectral response;
- and
- a third optoelectronic sensor configured to detect electromagnetic radiation in the visible light spectrum and the IR spectrum and to generate a third response representing a spectral content of the detected electromagnetic radiation, wherein the third optoelectronic sensor is not associated with any IR blocking filter.
4 more elements
Dependencies are inferred from the claim text.