Wearable Skin Tone Sensing for Accurate Optical Health Measurements

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Solution Overview

Problem

Wearable devices face inaccuracies in physiological data collection due to variable skin tones, which affect light absorption and signal strength, leading to decreased accuracy in measurements.

Innovation Solution

A wearable device that estimates skin tone metrics by comparing absorption rates of multiple wavelength ranges to calibrate physiological measurements, adjusting measurement parameters based on skin tone, and compensating for varying light absorption rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If optical components are used to collect physiological data, then data collection capability is improved, but measurement accuracy deteriorates due to skin tone variability affecting light absorption

Engineering Contradiction:

Improvedata collection capabilityVSAvoidphysiological data accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies parameter changes by measuring light absorption at multiple wavelength ranges (e.g., first, second, and third wavelength ranges) and using these varying parameters to calculate a skin tone metric. This allows the system to adapt to different skin tones by comparing absorption rates across wavelengths, thereby compensating for skin tone variability and improving measurement accuracy while maintaining data collection capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements feedback by using the measured light absorption data to calculate a skin tone metric, then using this metric to adjust or compensate for skin tone effects in physiological measurements. The system continuously monitors absorption rates and refines measurements based on the calculated skin tone characteristics, creating a closed-loop feedback mechanism that improves accuracy

Inventive Principle:

Principle #23Feedback

2Measurement precision

If multiple wavelength ranges are measured to determine skin tone, then measurement accuracy is improved, but power consumption increases

Engineering Contradiction:

Improveskin tone measurement accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies partial action by selectively measuring light absorption at specific wavelength ranges needed to calculate the skin tone metric, rather than continuously measuring all possible wavelengths. The system determines the minimum necessary measurements to achieve accurate skin tone characterization, thereby reducing power consumption while maintaining measurement precision

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent implements periodic action by performing skin tone measurements at intervals rather than continuously. The system can update the skin tone metric periodically or event-driven, reducing the frequency of multi-wavelength measurements while maintaining accurate physiological data collection, thus lowering overall power consumption

Inventive Principle:

Principle #19Periodic action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enhances the accuracy of physiological data collection and reduces power consumption by accounting for individual skin tones, thereby improving health monitoring precision.

Implementation Method 1

the wearable device may analyze one or more characteristics of light (e.g., signal strength, signal intensity, absorption, reflectance, etc.) that is transmitted and received using the one or more optical components

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

Methodology Applied

Scientific EffectLight reflectance: Reflection

Implementation Method 3

the wearable device may be configured to compare absorption rates of light associated with a first wavelength range to absorption rates of light associated with a second wavelength range and determine a skin tone metric for the user based on the comparison of the absorption rates

Methodology Applied

Scientific EffectAbsorption spectroscopy: Absorption Spectroscopy

Data Source

PatentUS20260009678A1Techniques for measuring skin tone using a wearable device

Publication Date: 2026.01.08 OURA HEALTH OY

AI summary

Methods, systems, and devices for measuring a skin tone using a wearable device are described. The method may include the wearable device transmitting, using one or more light-emitting components, first light associated with a first wavelength, second light associated with a second wavelength, and third light associated with a third wavelength and generating a first signal, a second signal, and a third signal based on the first light, the second light, and the third light, respectively, received at one or more photodetectors of the wearable device, Further, the method may include the wearable device determining a first difference between the first signal and the second signal, and a second difference between the first signal and the third signal and determining a skin tone metric associated with the user based on a comparison between the first difference and the second difference.