Inclined Photosensitive Elements for Texture Recognition
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Solution Overview
Problem
Current texture recognition systems for mobile devices face challenges in optimizing light utilization and sensing surface area, leading to inefficient texture collection and recognition, particularly in under-screen fingerprint recognition scenarios where light sources and image sensors are not optimally aligned.
Innovation Solution
A texture recognition apparatus featuring a base substrate with a light source array and an image sensor array, where at least part of the photosensitive elements of the image sensors are inclined relative to the substrate surface, improving light utilization and sensing area by ensuring vertical light incidence and allowing for a larger sensing surface within the same setting space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the photosensitive elements are arranged parallel to the base substrate surface, then the device structure is simple and easy to manufacture, but the light utilization efficiency is low and the sensing surface area is limited
Solution Approach 1:
The photosensitive elements are arranged at an asymmetric angle (40°-70°) relative to the base substrate surface rather than parallel. This asymmetric arrangement enables the light reflected from the texture to vertically incident the photosensitive elements, significantly improving light utilization efficiency and sensing capability while maintaining manufacturing feasibility through standardized angular ranges.
2Reliability
If the photosensitive elements are inclined at a large angle, then the light utilization efficiency improves, but the manufacturing complexity increases and alignment precision requirements increase
Solution Approach 1:
The patent specifies an optimized angular range of 40°-70° for the photosensitive elements relative to the base substrate surface. This parameter optimization balances light utilization efficiency with manufacturing feasibility, avoiding excessive alignment precision requirements while ensuring vertical light incidence for effective texture sensing.
3Productivity
If the sensing surface area is increased within the same setting space, then the texture collection capability improves, but the device structure becomes more complex
Solution Approach 1:
The photosensitive elements are tilted at an angle (40°-70°) relative to the base substrate surface, utilizing the third dimension (vertical angle) to increase the effective sensing surface area within the same planar footprint. This dimensional transition allows more photosensitive elements to be packed in the available space without increasing device complexity, thereby enhancing texture collection capability.
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
Enhances light utilization and texture recognition efficiency by ensuring vertical light incidence and increasing the sensing surface area, thereby improving the collection and recognition of textures such as fingerprints and palmprints.
Implementation Method 1
the plurality of image sensors are configured to receive light emitted from the plurality of light sources and reflected to the plurality of image sensors by a texture for texture collection
Data Source
AI summary
A texture recognition apparatus and a manufacturing method thereof are provided. The texture recognition apparatus includes a base substrate, a light source array and an image sensor array. The light source array is on a side of the base substrate and includes a plurality of light sources; the image sensor array is on a side of the base substrate and includes a plurality of image sensors, the plurality of image sensors are configured to receive light emitted from the plurality of light sources and reflected to the plurality of image sensors by a texture for texture collection; at least part of an photosensitive element of at least one image sensor of the plurality of image sensors is inclined relative to a surface of the base substrate.