Fingerprint Recognition Device Light Conversion Layer
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Solution Overview
Problem
Current fingerprint recognition devices face challenges in achieving clear and uniform fingerprint images due to interference from the light source and inadequate light uniformity, leading to poor imaging performance.
Innovation Solution
A fingerprint recognition device comprising a light source, a light conversion layer with particles that convert light to a different wavelength, and a light filter that filters out the original light while allowing the converted light to pass through, ensuring clarity and uniformity of the fingerprint image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light source is used to illuminate the fingerprint, then the fingerprint can be imaged, but the original light interferes with the detection and reduces image quality
Solution Approach 1:
A light conversion layer is introduced as an intermediary between the light source and the fingerprint. This layer converts the original light (first wavelength) to converted light (second wavelength), allowing the fingerprint to be illuminated while the detection system only receives the converted wavelength, eliminating interference from the original light source
Solution Approach 2:
The light conversion layer changes the wavelength parameter of the light. By converting light from a first wavelength to a second wavelength, the system enables the light source to operate at one wavelength while the detector operates at a different wavelength, resolving the interference issue
2Device complexity
If conventional lighting is used, then the structure is simple, but the light uniformity is insufficient and imaging performance is poor
Solution Approach 1:
The light conversion layer serves as a mediator that not only converts wavelength but also improves light uniformity. By positioning this layer between the light source and fingerprint, the system achieves better illumination distribution without significantly increasing overall device complexity
Solution Approach 2:
The light conversion layer is positioned specifically in the region where light uniformity is needed most - between the light source and the fingerprint imaging area. This localized approach improves imaging quality without requiring the entire device to be redesigned
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 enhances fingerprint recognition by providing clear and distinguishable images with reduced interference, as evidenced by higher 'Figure of Merit' values and improved light uniformity, resulting in better fingerprint imaging quality compared to comparative examples.
Implementation Method 1
The light conversion layer is configured to convert the first light to a second light having a second wavelength different from the first wavelength
Implementation Method 2
The light filter is disposed between the light conversion layer and the light detector, and configured to substantially filter out the first light and substantially pass the second light
Implementation Method 3
The light detector is configured to detect the second light reflected by a fingerprint
Data Source
AI summary
A fingerprint recognition device includes a light source, a light conversion layer, a light detector, and a light filter. The light source is configured to emit a first light having a first wavelength. The light conversion layer is configured to convert the first light to a second light having a second wavelength different from the first wavelength. The light detector is configured to detect the second light reflected by a fingerprint. The light filter is disposed between the light conversion layer and the light detector, and configured to substantially filter out the first light and substantially pass the second light.