Optical-Mechanical Structure for Biometric Sensing
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Solution Overview
Problem
Existing optoelectronic devices face challenges in integrating optical-mechanical structures to effectively cooperate with various light sources and sensors for simultaneous functions like fingerprint recognition and vein anti-counterfeiting, requiring an improved design to enhance light-receiving capabilities and flexibility.
Innovation Solution
The proposed sensing device features a unique optical-mechanical structure with a first substrate, sensing elements, light-shielding layers, and an insulating layer, allowing for adjustable light-receiving angles and ranges, and includes a light emitting element connected to the light-shielding layers to facilitate flexible integration with different sensing elements and light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional optical-mechanical structure is used, then the device can perform basic sensing functions, but the signal-to-noise ratio is insufficient and the flexibility in light reception is limited
Solution Approach 1:
The light-shielding layer is divided into multiple segments (first light-shielding layer with first opening, second light-shielding layer with second opening) that can independently control light paths. This segmentation allows precise control of light reception angles and improves signal-to-noise ratio by blocking unwanted light while maintaining device modularity
Solution Approach 2:
The patent introduces a vertical stacking dimension by placing multiple light-shielding layers at different heights above the sensing element. The first light-shielding layer is positioned at a first height with a first opening, and the second light-shielding layer is positioned at a second height with a second opening, creating a three-dimensional light control structure that enhances light reception flexibility and signal quality
2Adaptability or versatility
If the optical-mechanical structure is designed for specific sensing functions, then the structure becomes optimized for those functions, but the adaptability to different light sources and sensing types is reduced
Solution Approach 1:
The optical-mechanical structure uses universal light-shielding layers with adjustable openings that can work with different types of light sources (visible light, infrared light) and sensing elements. The first and second light-shielding layers can be configured to support multiple sensing functions including fingerprint recognition and vein anti-counterfeiting, providing a multi-functional platform that simplifies integration across different applications
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 enhances the signal-to-noise ratio and flexibility in light reception, enabling the device to perform multiple sensing functions efficiently, such as fingerprint recognition and vein anti-counterfeiting, by optimizing the light-receiving properties and simplifying the integration of sensing and light emitting elements.
Implementation Method 1
the sensing element can detect the light reflected by fingerprints to generate currents of different magnitudes
Implementation Method 2
a light emitting element disposed on the second light-shielding layer
Data Source
AI summary
A sensing device includes a first substrate, a first sensing element, a first light-shielding layer, a second light-shielding layer and an insulating layer. The first sensing element is disposed on the first substrate. The first light-shielding layer is disposed on the first sensing element and has a first opening, wherein the first opening is completely overlapped with the first sensing element. The second light-shielding layer is disposed on the first light-shielding layer and includes an upper light-shielding part and a lateral light-shielding part, wherein the upper light-shielding part is overlapped with the first light-shielding layer and has a second opening, and the lateral light-shielding part is separated from the upper light-shielding part. The insulating layer is disposed between the first light-shielding layer and the second light-shielding layer, and the lateral light-shielding part covers a sidewall of the insulating layer.