Optical Module Light Blocking Structure for Wearable Signal Noise

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Solution Overview

Problem

Electronic wearable devices face challenges with low signal-to-noise ratio (SNR) in non-invasive optical measurements due to weak signals and signal attenuation during transmission, particularly in physiological parameter monitoring.

Innovation Solution

The optical module incorporates a light blocking structure and optical filters to define light transmission paths and filter out noise, enhancing the signal-to-noise ratio by isolating optical receivers from emitters and environmental light, thereby improving detection accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If optical receivers are used to receive light signals for physiological parameter monitoring, then measurement capability is provided, but signal-to-noise ratio deteriorates due to weak signals and environmental light interference

Engineering Contradiction:

Improvesignal-to-noise ratioVSAvoidenvironmental light interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The optical module segments the optical path by introducing a light blocking structure that divides the receiving area into a first receiving area for first wavelength band light and a second receiving area for second wavelength band light. This segmentation prevents environmental light in one wavelength band from interfering with detection in another wavelength band, thereby improving signal-to-noise ratio for physiological parameter monitoring

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces optical filters as intermediary elements between the optical receivers and environmental light sources. These filters selectively transmit specific wavelength bands while blocking others, acting as mediators that allow desired light signals to pass through while preventing harmful environmental light interference from reaching the optical receivers

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If multiple optical receivers for different wavelength bands are integrated in a compact wearable device, then measurement functionality is enhanced, but light interference between different wavelength bands occurs

Engineering Contradiction:

Improvemulti-parameter monitoring capabilityVSAvoidcrosstalk between wavelength bands

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The light blocking structure segments the optical module into distinct detection zones for different wavelength bands. The first optical receiver and second optical receiver are spatially separated by this structure, preventing light from one wavelength band from reaching the wrong receiver and causing crosstalk, thus enabling accurate multi-parameter monitoring

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by assigning specific optical filtering properties to different regions of the optical module. Each optical receiver is equipped with filters tailored to its specific wavelength band requirements, allowing the system to maintain high adaptability for multiple physiological parameter monitoring while minimizing inter-band interference

Inventive Principle:

Principle #3Local quality

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

This configuration effectively increases the signal-to-noise ratio, reduces transmission loss, and enhances the accuracy of physiological parameter monitoring in wearable devices.

Implementation Method 1

a light blocking structure having a first portion around the first optical receiver and the second optical receiver. The light blocking structure is substantially opaque to the first wavelength band and the second wavelength band

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Implementation Method 2

a first optical filter disposed over the first optical receiver and configured to allow the first light to pass through, and a second optical filter disposed over the second optical receiver and configured to allow the second light to pass through

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Data Source

PatentUS20240272365A1Optical module

Publication Date: 2024.08.15 ADVANCED SEMICON ENG INC

AI summary

An optical module is disclosed. The optical module includes a carrier, a first optical receiver disposed over the carrier and configured to receive a first light of a first wavelength band, and a second optical receiver disposed over the carrier and configured to receive a second light of a second wavelength band different from the first wavelength band. The optical module also includes a light blocking structure having a first portion around the first optical receiver and the second optical receiver. The light blocking structure is substantially opaque to the first wavelength band and the second wavelength band. The optical module also includes a first optical filter disposed over the first optical receiver and configured to allow the first light to pass through, and a second optical filter disposed over the second optical receiver and configured to allow the second light to pass through.