Pattern Recognition Substrate With Anti-Static ESD Protection
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Solution Overview
Problem
Pattern recognition apparatuses using optical imaging for identity verification are prone to electro-static discharge (ESD) when fingers come into direct contact, which interferes with fingerprint recognition and affects image quality.
Innovation Solution
Incorporating an anti-static layer on the pattern recognition substrate that covers both the pattern recognition and non-pattern recognition areas, optionally with a conductive or high-resistance film, to prevent static electricity from entering the substrate and guide it away, combined with anti-glare and protective layers to enhance image quality and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pattern recognition substrate is used for optical imaging of fingerprint patterns, then identity verification capability is provided, but electro-static discharge occurs when fingers come into direct contact which interferes with recognition and affects image quality
Solution Approach 1:
An anti-static layer is introduced as an intermediary component between the fingerprint contact surface and the pattern recognition substrate. This layer acts as a mediator that prevents direct electrical contact while maintaining optical transparency, thereby eliminating ESD interference without compromising recognition reliability
Solution Approach 2:
The anti-static layer is implemented as a thin film structure that is optically transparent yet electrically protective. This thin film serves as a flexible barrier that allows optical imaging to pass through while blocking electro-static discharge, resolving the contradiction between recognition reliability and ESD protection
2Object-affected harmful factors
If an anti-static layer is added to cover the pattern recognition area, then ESD protection is improved, but the device structure becomes more complex
Solution Approach 1:
The anti-static layer is designed to serve multiple functions simultaneously: it provides ESD protection, maintains optical transparency for fingerprint imaging, and can be integrated with existing substrate structures. This multi-functionality approach adds protection capability without proportionally increasing overall device complexity
Solution Approach 2:
The anti-static layer utilizes composite material properties that combine electrical resistance characteristics with optical transparency. By selecting materials that inherently possess both properties, the design achieves ESD protection and optical functionality without requiring multiple separate layers, thereby minimizing structural complexity
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 anti-static layer effectively prevents ESD interference, ensuring consistent and high-quality fingerprint recognition, while the anti-glare and protective layers improve image collection and durability against external factors.
Implementation Method 1
prone to electro-static discharge (ESD) when fingers come into direct contact
Implementation Method 2
the anti-static layer is a conductive layer
Implementation Method 3
the anti-static layer is a high-resistance film
Data Source
AI summary
A pattern recognition module and a pattern recognition apparatus. The pattern recognition module includes a pattern recognition substrate, and the pattern recognition substrate includes a pattern recognition area and a non-pattern recognition area located on at least one side of the pattern recognition area; and an anti-static layer, located on the pattern recognition substrate, and an orthographic projection of the anti-static layer on the pattern recognition substrate completely covers the pattern recognition area, extends to the non-pattern recognition area, and overlaps the non-pattern recognition area.