Ring Optical Sensor Layout for Higher Biometric Light Detection
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Solution Overview
Problem
Conventional detection devices with a ring-shaped housing are inefficient in detecting light from a light source due to the optical sensor being positioned on only one side, resulting in wasted light and reduced detection accuracy.
Innovation Solution
The detection device incorporates a first and second optical sensor, each comprising an organic photodiode, positioned on opposite sides of a light source within a ring-shaped housing, allowing for the detection of light emitted by the light source from both ends, enhancing light reception and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an optical sensor is provided only on one side of the light source in a ring-shaped housing, then the device structure is simple, but the light detection accuracy is reduced and light is wasted
Solution Approach 1:
The optical sensor is divided into two separate sensors: a first optical sensor positioned adjacent to one end of the light source and a second optical sensor positioned adjacent to the other end. This segmentation allows each sensor to detect light from its respective side, eliminating wasted light and improving detection accuracy while maintaining reasonable structural complexity
Solution Approach 2:
The arrangement transitions from a single-sided linear detection to a dual-sided circumferential detection along the light source. By positioning sensors at both ends of the light source in the circumferential direction, the system utilizes the spatial dimension more effectively to capture light that would otherwise be wasted
2Device complexity
If an optical sensor is provided only on one side of the light source, then the device configuration is simple, but the amount of received light is insufficient
Solution Approach 1:
The detection function is segmented into two separate optical sensors positioned at opposite sides of the light source. This allows the system to collect light from both sides simultaneously, effectively doubling the light reception capacity and ensuring that light traveling in different directions is not wasted
Solution Approach 2:
The first and second optical sensors work together in combination to detect light from both ends of the light source. By merging their detection capabilities, the system achieves comprehensive light reception that maximizes the utilization of light emitted by the light source
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 configuration improves light detection accuracy by utilizing both sides of the light source, increasing the amount of received light and enhancing the device's ability to detect biometric information such as fingerprints and vein patterns.
Implementation Method 1
a first optical sensor provided in the housing so as to be adjacent to one end of the light source in a circumferential direction of the housing; and a second optical sensor provided in the housing so as to be adjacent to the other end of the light source in the circumferential direction of the housing. At least the first optical sensor is an organic photodiode
Data Source
AI summary
According to an aspect, a detection device includes: a ring-shaped housing; a light source provided in the housing; a first optical sensor provided in the housing so as to be adjacent to one end of the light source in a circumferential direction of the housing; and a second optical sensor provided in the housing so as to be adjacent to the other end of the light source in the circumferential direction of the housing. At least the first optical sensor is an organic photodiode including a sensor substrate, a lower electrode, a lower buffer layer, an active layer, an upper buffer layer, and an upper electrode.