Texture Recognition Device Light Source Array Overlap
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Solution Overview
Problem
Current fingerprint recognition technologies face challenges in achieving high speed and accuracy due to limited imaging ranges of point and line light sources, which often result in incomplete or distorted texture images.
Innovation Solution
A drive method for a texture recognition device that employs a light source array with multiple sub-light sources, where the light source array operates to provide different photosensitive light sources at various moments, with overlapping imaging ranges to enhance the effective imaging area and prevent afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a point light source or line light source is used for texture recognition, then the device structure is simple, but the imaging range is limited and texture images may be incomplete or distorted
Solution Approach 1:
The light source array is divided into multiple independently controllable sub-light sources arranged in specific patterns (e.g., circular, rectangular, or irregular arrangements). Each sub-light source can be activated separately to provide different imaging ranges, allowing the system to cover a larger overall area while maintaining structural simplicity.
Solution Approach 2:
Multiple imaging ranges from different sub-light source combinations are merged through overlapping to form a comprehensive coverage area. The patent describes how different combinations of sub-light sources create overlapping imaging ranges that collectively cover the entire texture recognition area, eliminating dead zones and ensuring complete texture capture.
2Area of stationary object
If multiple sub-light sources are activated simultaneously to expand imaging range, then the imaging coverage increases, but the device complexity and control difficulty increase
Solution Approach 1:
The system dynamically selects and activates specific combinations of sub-light sources based on real-time requirements. Different driving methods are employed to activate different subsets of sub-light sources at different times, allowing flexible adjustment of imaging range and resolution without permanently increasing system complexity.
Solution Approach 2:
The patent employs periodic activation of different sub-light source combinations, where each sub-light source or combination is activated in sequence rather than all simultaneously. This time-division multiplexing approach allows the system to achieve comprehensive coverage through multiple sequential imaging cycles, reducing the complexity of simultaneous control while maintaining complete texture capture.
3Device complexity
If a single light source is used to simplify the system, then the device complexity is low, but afterimages may occur and recognition accuracy decreases
Solution Approach 1:
Different sub-light sources are positioned to illuminate different local regions of the texture with optimized characteristics. Each sub-light source provides locally optimized illumination that prevents afterimages in its specific coverage area, and the combination of multiple locally optimized illuminations achieves global precision without requiring a single complex 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
This approach allows for a larger and more accurate texture image capture, improving the speed and accuracy of fingerprint recognition by combining overlapping imaging ranges from multiple light sources.
Implementation Method 1
the plurality of image sensors are configured to receive light emitted from the plurality of sub-light sources and then reflected by a texture to the plurality of image sensors for a texture collection
Data Source
AI summary
A drive method for a texture recognition device and a texture recognition device. The texture recognition device includes a light source array and an image sensor array. The image sensor array includes a plurality of image sensors, the plurality of image sensors are configured to receive light emitted from the plurality of sub-light sources and then reflected by a texture to the plurality of image sensors for a texture collection; the drive method includes: at a first moment, the light source array operating to provide a first photosensitive light source, and at the first moment or a second moment different from the first moment, the light source array operating to provide a second photosensitive light source. A first imaging range of the first photosensitive light source on the image sensor array partially overlaps a second imaging range of the second photosensitive light source on the image sensor array.