Fingerprint Chip on Touch Panel Back for Waterproofing
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Solution Overview
Problem
Existing fingerprint identification modules in mobile devices face issues with waterproofing and accuracy due to their exposure through holes in the touch panel, which also affect the device's appearance and functionality.
Innovation Solution
A fingerprint identification system where the fingerprint identification chip is directly attached to the lower surface of the touch panel, with a flexible circuit board and strategically formed grooves on the touch panel to reduce the distance between the chip and the user's finger, enhancing waterproofing and identification accuracy, and using an adhesive for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fingerprint identification module is exposed through a through hole in the touch panel, then the module is accessible for operation, but waterproofing performance deteriorates and appearance quality worsens
Solution Approach 1:
The fingerprint identification module is extracted from the traditional below-panel position and integrated directly onto the touch panel surface, eliminating the need for through-hole exposure while maintaining operational accessibility through the touch interface
Solution Approach 2:
The fingerprint identification module and touch panel are merged into a single integrated structure, where the fingerprint chip is mounted on the back of the touch panel and communicates through the touch sensing layers, eliminating the need for separate through-hole openings
2Device complexity
If the fingerprint identification module is disposed below the touch panel, then the structure is simplified, but fingerprint identification accuracy deteriorates
Solution Approach 1:
The fingerprint identification module is positioned in a different spatial dimension - mounted on the back surface of the touch panel rather than below it, allowing optical or electrical signals to pass through the touch panel thickness to reach the fingerprint sensor, thereby improving identification accuracy while maintaining integration
Solution Approach 2:
The touch panel itself serves as an intermediary medium between the user's finger and the fingerprint identification chip, allowing the chip to be positioned on the back of the panel while still capturing fingerprint data through the panel material
3Ease of operation
If the fingerprint identification module is exposed through a through hole, then the module is accessible, but the appearance quality of the mobile phone deteriorates
Solution Approach 1:
The need for through-hole openings is extracted and eliminated by integrating the fingerprint module directly onto the touch panel, allowing the touch panel surface to remain intact and maintain aesthetic appearance while preserving functionality through touch-based interaction
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 configuration improves waterproofing and fingerprint identification accuracy while maintaining a sleek appearance by reducing the thickness and distance between the chip and the user's finger, ensuring better sensitivity and structural integrity.
Implementation Method 1
using an adhesive for secure attachment
Data Source
AI summary
An input assembly includes a touch panel, a fingerprint identification chip, and a flexible circuit board. The fingerprint identification chip is attached to a lower surface of the touch panel. The flexible circuit board is attached to the fingerprint identification chip. The touch panel and the flexible circuit board are correspondingly disposed on two opposite sides of the fingerprint identification chip.