Hidden ESD Shielding Around Fingerprint Sensor ICs
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Solution Overview
Problem
Conventional electronic devices often require visible metallic frames or bezels for electrostatic discharge (ESD) protection, which can be aesthetically undesirable and unnecessary, as they divert ESD strikes away from sensitive components like fingerprint sensors.
Innovation Solution
A cosmetically hidden ESD protection structure is implemented using a conductive material, such as a gold-plated trace, surrounding the fingerprint sensor IC, connected to ground, and concealed with a conductive paint layer or carbon screen to direct ESD strikes safely without visible components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallic frame or bezel is used for ESD protection, then the sensor is protected from electrostatic discharge, but the aesthetic appearance deteriorates due to visible metallic components
Solution Approach 1:
The patent uses a thin conductive film or coating applied to the bezel or frame structure. This conductive layer provides ESD protection while maintaining the original aesthetic appearance of the device, as the thin film is either invisible or blends with the existing design, eliminating the need for bulky visible metallic ESD structures
Solution Approach 2:
The patent changes the electrical parameters of existing structural components by applying conductive coatings or treatments to the bezel or frame. This transforms non-conductive or weakly conductive materials into effective ESD protection structures without altering the visible appearance, thus resolving the contradiction between protection and aesthetics
2Shape
If a conductive paint layer or carbon screen is used to conceal ESD structures, then the aesthetic appearance is maintained, but the manufacturing complexity increases
Solution Approach 1:
The patent combines the ESD protection function with the existing cosmetic bezel or frame structure by integrating conductive materials into the manufacturing process. This merging of functions eliminates the need for separate ESD protection components and their associated assembly steps, thereby reducing overall manufacturing complexity despite the added conductive material application
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 effectively protects fingerprint sensors from ESD without the need for a metallic frame, ensuring the sensor's functionality while maintaining a uniform appearance, thus enhancing both protection and aesthetics.
Implementation Method 1
A cosmetically hidden ESD protection structure is implemented using a conductive material, such as a gold-plated trace, surrounding the fingerprint sensor IC, connected to ground
Implementation Method 2
concealed with a conductive paint layer or carbon screen
Data Source
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AI summary
Cosmetically hidden electrostatic discharge (ESD) protection structures and systems are disclosed herein. In one example, an electronic device is provided. The electronic device includes an integrated circuit and an ESD protection structure positioned at least partially around a perimeter of the integrated circuit, where the ESD protection structure is configured to protect the integrated circuit from an electrostatic discharge strike. The electronic device further includes a concealing layer positioned on a surface of the ESD protection structure, the concealing layer configured to at least partially conceal the ESD protection structure from view.