Integrated Optical Sensor Layout for Compact Biometric Detection
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Solution Overview
Problem
Existing detecting devices for non-invasively measuring biological information face limitations in reducing size due to the configuration of shielding members and filters, which affect light utilization efficiency and detection accuracy.
Innovation Solution
A detecting device with a substrate and detecting elements arranged in a matrix, where each element includes a light emitting portion using an organic electroluminescent element adjacent to a photoelectric conversion portion, allowing for closer placement and reduced size, and a measuring apparatus that identifies biological information from detection signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If shielding members and filters are provided to prevent unnecessary light from incident on the light receiving portion, then detection accuracy is improved, but device size cannot be reduced further
Solution Approach 1:
The patent combines the light emitting element and light receiving element into a single integrated detecting element structure, where the light receiving element is positioned adjacent to the light emitting element on the same substrate. This merging eliminates the need for separate shielding members and filters, reducing device size while maintaining detection accuracy through the close proximity arrangement that enables effective signal reception.
Solution Approach 2:
The detecting element structure serves multiple functions simultaneously: the light receiving element detects reflected light for biological information measurement, while the close integration with the light emitting element provides inherent spatial filtering. This multi-functional design eliminates the need for dedicated shielding components, resolving the contradiction between detection accuracy and device size.
2Object-affected harmful factors
If shielding members are provided to cover the substrate and block light, then stray light is managed, but light utilization efficiency is compromised
Solution Approach 1:
The patent implements local quality by positioning the light receiving element at a specific location adjacent to the light emitting element, creating a localized detection zone. This spatial arrangement provides inherent stray light rejection for the specific detection path while allowing maximum light utilization for the intended measurement, eliminating the need for broad shielding members that would block useful light.
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
The solution enables a smaller detecting device with increased light reception and reduced noise, enhancing measurement accuracy and power efficiency by eliminating the need for additional filters, while maintaining high signal-to-noise ratio.
Implementation Method 1
a light emitting portion configured to emit light toward a living body... the light emitting portion includes an organic electroluminescent light emitting element
Implementation Method 2
a light receiving portion configured to receive light from the living body... the light receiving portion includes a photoelectric conversion portion formed at the substrate
Data Source
AI summary
A detecting device includes a substrate and a plurality of detecting elements arranged in a matrix at the substrate. Each of the plurality of detecting elements includes a light emitting portion and a light receiving portion that receives light of a wavelength emitted from the light emitting portion at a position adjacent to the light emitting portion. The light receiving portion includes a photoelectric conversion portion formed at the substrate. The light emitting portion includes an organic EL light emitting element formed at the substrate. The area of the light receiving portion is larger than the area of the light emitting portion.