Fingerprint Sensing Module Optical Collimating Layer Light Control
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Solution Overview
Problem
Conventional electronic fingerprint sensing devices suffer from real-time processing limitations and errors due to the reception of blurred images from multiple positions on the finger surface, leading to inaccurate fingerprint recognition.
Innovation Solution
A fingerprint sensing module with an optical-collimating layer between the optical cover and sensing device, featuring light-blocking and light-transmitting areas, ensures accurate light transmission and blocking, preventing scattered light from interfering with the sensing units, thereby enhancing image clarity and recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an optical sensing device is used to sense reflected light from the finger surface, then real-time fingerprint sensing is achieved, but the optical sensing device receives blurred images from multiple positions causing error judgment
Solution Approach 1:
The optical-collimating layer is segmented into multiple light-transmitting areas and light-blocking areas arranged in an array. Each light-transmitting area corresponds to a specific sensing unit, directing light only from its corresponding finger surface position. This segmentation prevents cross-contamination of light signals from different positions, resolving the blur issue while maintaining real-time sensing capability.
Solution Approach 2:
The optical-collimating layer acts as an intermediary component between the optical cover and the sensing device. It mediates the light transmission by selectively allowing light to pass through specific areas while blocking light from other positions. This intermediary structure ensures that each sensing unit receives light only from its corresponding finger surface position, eliminating image blur without sacrificing real-time sensing performance.
2Device complexity
If light is transmitted directly from the finger surface to the sensing device, then the structure is simple, but scattered light from multiple positions causes image blur and recognition errors
Solution Approach 1:
Rather than using complex optical systems like lenses or mirrors, the patent segments the optical path into discrete light-transmitting and light-blocking areas. This segmentation approach achieves precise light control with a relatively simple planar structure, maintaining low device complexity while significantly improving image accuracy by preventing scattered light from reaching incorrect sensing units.
Solution Approach 2:
The optical-collimating layer exhibits local quality variations through its pattern of light-transmitting and light-blocking areas. Each local region (light-transmitting area) is optimized to transmit light only from its corresponding position, while adjacent light-blocking areas prevent light from neighboring positions. This local optimization achieves high measurement precision without requiring complex global optical systems.
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 accurately senses fingerprint images by controlling light transmission and blocking, reducing errors and improving recognition accuracy by ensuring that each sensing unit receives light only from the intended area, thus enhancing real-time identity recognition capabilities.
Implementation Method 1
The light-blocking areas are adapted to block a portion of the sensing light
Implementation Method 2
the optical cover is adapted to transmit a sensing light from the user's finger to the optical-collimating layer
Data Source
AI summary
A fingerprint sensing module adapted to sense fingerprint of user's finger is provided. The fingerprint sensing module includes a sensing device, an optical cover and an optical-collimating layer located between the sensing device and the optical cover. The sensing device includes a sensing surface, and the optical-collimating layer covers the sensing surface. The optical-collimating layer includes light-blocking areas and light-transmitting areas, and each of the light-transmitting area is surrounded by a part of the light-blocking areas. The optical cover is disposed on the optical-collimating layer, and the optical cover is adapted to contact the user's finger, and the optical cover is adapted to transmit a sensing light from the user's finger to the optical-collimating layer, and the light-blocking areas are adapted to block a portion of the sensing light, and another portion of the sensing light is transmitted to the sensing surface through the light-transmitting areas.