Fingerprint Module Microstructures Air Gap Light Collimation
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Solution Overview
Problem
Conventional fingerprint identification modules face challenges in improving identification performance due to the need for frequent password input and the complexity of integrating secure and convenient fingerprint recognition systems in electronic devices.
Innovation Solution
A fingerprint identification module is designed with a cover plate featuring microstructures, a fingerprint identification sensor, and a light source, where the sensor is attached through a first adhesive layer with an air gap, and an optical element layer is placed between the microstructures and the sensor to enhance light collimation and focusing, improving identification accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the fingerprint identification sensor is directly attached to the microstructures without an air gap, then the structural complexity is reduced, but the light transmission and identification performance are degraded
Solution Approach 1:
An air gap is introduced as an intermediary layer between the microstructures and the fingerprint identification sensor. This air gap serves as a mediator that allows light to pass through the microstructures without being blocked by adhesive material, thereby improving light transmission and fingerprint identification accuracy while maintaining structural simplicity
Solution Approach 2:
The adhesive layer is applied selectively only to specific regions where structural support is needed, rather than covering the entire surface. This localized application allows light to pass through uncovered regions via the air gap, improving identification performance while maintaining necessary structural attachment
2Measurement precision
If additional optical elements are added to enhance light collimation and focusing, then the identification performance is improved, but the device complexity increases
Solution Approach 1:
The microstructures themselves are designed with specific geometric parameters (shape, size, spacing) that enable light collimation and focusing functions. By optimizing these structural parameters, the system achieves improved identification performance without adding separate optical elements, thus avoiding increased device complexity
Solution Approach 2:
The microstructures serve multiple functions simultaneously: they provide structural support for the sensor, enable light transmission, and perform optical functions (collimation and focusing) through their geometric design. This multi-functionality eliminates the need for additional dedicated optical elements
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 module enhances identification performance by increasing light intensity and reducing signal attenuation, allowing for more accurate fingerprint recognition without additional optical elements, thus providing improved convenience and security.
Implementation Method 1
improve the identification performance by collimating and focusing a light beam reflected by a finger on the fingerprint identification sensor with the disposition of the microstructures
Implementation Method 2
improve the identification performance by collimating and focusing a light beam reflected by a finger on the fingerprint identification sensor with the disposition of the microstructures
Implementation Method 3
The fingerprint identification sensor is attached to the microstructures through a first adhesive layer, wherein the first adhesive layer is adhered between a portion of the microstructures and a portion of the fingerprint identification sensor
Data Source
AI summary
A fingerprint identification module including a cover plate, a fingerprint identification sensor, a first adhesive layer, and at least one light source is provided. The cover plate has an inner surface, an outer surface opposite to the inner surface, and a plurality of microstructures located at the inner surface. The fingerprint identification sensor is located under the microstructures and attached to the microstructures through the first adhesive layer, wherein the first adhesive layer is adhered between a portion of the microstructures and a portion of the fingerprint identification sensor, and an air gap is located between the other portion of the microstructures and the other portion of the fingerprint identification sensor. The at least one light source is located under the inner surface and adjacent to the fingerprint identification sensor.