Biometric Sensor Optical Layer Coded Pattern
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Solution Overview
Problem
Current biometric devices on smart wearable devices face challenges in achieving accurate identity recognition due to the direct transfer of sensing light from infrared light emitting diodes to image sensors, which affects the accuracy and requires a light and thin ID recognition system.
Innovation Solution
A biometric device design incorporating an optical layer and a supporting structure between the infrared light emitting diodes and the image sensor to prevent direct light transfer, utilizing a coded pattern on the optical layer to maintain sensing accuracy while achieving a thin form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional optical module is used for infrared light detection, then sensing accuracy can be maintained, but the device volume and thickness increase
Solution Approach 1:
The patent extracts and removes the lens component from the conventional optical module, retaining only the essential infrared light emitting diode and image sensor. This extraction eliminates the bulky lens while maintaining the core sensing function through direct infrared illumination and detection, thereby reducing device volume while preserving measurement precision.
Solution Approach 2:
The patent introduces a coded pattern as an intermediary element between the infrared light source and the image sensor. This coded pattern modulates the infrared light to encode depth information, enabling the system to achieve sensing accuracy comparable to conventional optical modules with lenses, while maintaining a thin, compact structure without requiring a bulky lens component.
2Length of stationary object
If infrared light emitting diodes are positioned close to the image sensor, then device thickness is reduced, but sensing light is directly transferred to the image sensor reducing accuracy
Solution Approach 1:
The patent introduces a coded pattern as an intermediary element positioned between the infrared light emitting diode and the image sensor. This coded pattern modulates the infrared light to encode depth information, preventing direct light transfer while maintaining sensing accuracy. The intermediary coded pattern enables the system to achieve both thinness and accuracy by transforming the direct light path into a modulated information-carrying path.
Solution Approach 2:
The patent changes the parameter of light modulation by introducing a coded pattern that encodes depth information through varying optical properties. This parameter change transforms the simple direct light transfer into a modulated signal carrying spatial information, allowing the system to maintain sensing accuracy even when the infrared LED is positioned close to the image sensor, thereby achieving thin device design without sacrificing measurement precision.
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 effectively maintains sensing accuracy while reducing the device's volume and thickness, enabling a thinning tendency and integration into wearable carriers with multi-functional capabilities.
Implementation Method 1
at least one infrared light emitting diode (IR LED)
Implementation Method 2
sensing light emitted by the infrared light emitting diode
Implementation Method 3
The optical layer is disposed on the supporting structure, covers the image sensor, and includes a coded pattern
Implementation Method 4
prevent sensing light from being directly transferred to the image sensor
Data Source
AI summary
A biometric device includes a substrate, an image sensor, at least one infrared light emitting diode (IR LED), a supporting structure and an optical layer. The image sensor is disposed on the substrate. The at least one IR LED is disposed on the substrate. The supporting structure is disposed on the substrate and located between the image sensor and the at least one infrared light emitting diode. The optical layer is disposed on the supporting structure, covers the image sensor, and includes a coded pattern.