Fingerprint Sensor Without Outer Frame for Display Integration
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Solution Overview
Problem
Conventional capacitive fingerprint recognition devices require an outer frame for operation, limiting their application to specific locations on electronic products and increasing manufacturing costs when integrated into display surfaces.
Innovation Solution
A fingerprint recognition device with a substrate-mounted sensor, oscillator, timer, and digital comparator that generates and counts oscillatory frequency signals to detect finger touches without an additional frame, utilizing a dielectric layer and integrated chip components for touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an outer frame is added to enable fingerprint recognition, then touch detection capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the frame structure with the display surface by making the display surface itself conductive and capable of serving as the touch detection element. The conductive layer is integrated into the display structure, eliminating the need for a separate outer frame while maintaining touch detection functionality.
Solution Approach 2:
The display surface is given multiple functions: it serves both as the visual display interface and as the touch detection interface for fingerprint recognition. This multi-functionality eliminates the need for dedicated frame structures and reduces overall device complexity.
2Reliability
If an outer frame is added to enable fingerprint recognition, then touch detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the display surface and touch detection functions into a single integrated structure. The conductive layer is formed as part of the display manufacturing process, eliminating the need for separate frame assembly and reducing manufacturing costs.
Solution Approach 2:
By making the display surface multi-functional (both display and touch detection), the patent eliminates the need for additional frame components, thereby reducing material costs and assembly complexity in manufacturing.
3Adaptability or versatility
If the fingerprint recognition device is attached to the display surface, then application flexibility is improved, but visibility of the display surface is reduced
Solution Approach 1:
The patent merges the fingerprint recognition functionality directly into the display surface by making it conductive. This integration allows the entire display surface to serve as the sensing area, maximizing both visibility and application flexibility without requiring separate frame structures.
4Measurement precision
If additional matching of the outer frame is performed, then touch detection accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the display surface and touch detection functions into a single integrated structure. The conductive layer is formed as part of the display manufacturing process, eliminating the need for separate frame assembly and reducing manufacturing 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
Enables fingerprint recognition on display surfaces without additional frames, reducing manufacturing costs and effectively sensing finger touches while minimizing accidental triggers and power consumption.
Implementation Method 1
a touch capacitance is generated between the finger and the plurality of sensing finger touch pads
Data Source
AI summary
The fingerprint recognition device of the present invention includes: a substrate; a sensor located on the substrate and the sensor including a plurality of sensing finger touch pads around thereof; an oscillator, electrically connected to the plurality of sensing finger touch pads, and outputting at least one oscillating frequency signal; a timer outputting a clock signal to the oscillator; and a counting and digital comparator, counting and comparing the oscillating frequency signals. The fingerprint recognition method of the present invention includes: the oscillator receiving the clock signal and outputting the oscillation frequency signal; a finger touching the plurality of sensing finger touch pads; and counting and comparing the oscillation frequency signal and the oscillation frequency signal after the touch. The present invention is applied to the display surface of the electronic product, and detects whether the finger touches the fingerprint recognition device.