Under-Glass Fingerprint Sensor Layout Without Physical Touch Buttons
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Solution Overview
Problem
Traditional terminal devices face challenges in integrating fingerprint identification and touch button functions, as the physical button design affects the aesthetic appearance and user convenience, and requires precise pressure to distinguish between fingerprint identification and touch button actions.
Innovation Solution
The integration of a fingerprint identification sensor and a capacitive button sensor below the cover glass of a terminal device's touch screen, allowing for simultaneous collection of fingerprint and touch button information without the need for a physical button, with the capacitive button sensor located on at least one side of the fingerprint identification sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a physical button is combined with the fingerprint identification sensor, then the touch button function can be realized, but the aesthetic appearance of the terminal device is affected and user convenience is reduced
Solution Approach 1:
The patent merges the fingerprint identification sensor and capacitive button sensor into a single integrated structure below the cover glass. The fingerprint identification sensor occupies the central touch area while capacitive button sensors are positioned on the sides, allowing both functions to coexist in a unified design that maintains aesthetic appearance while providing both fingerprint identification and touch button capabilities.
Solution Approach 2:
The integrated sensor structure serves multiple functions: the fingerprint identification sensor enables fingerprint authentication, while the capacitive button sensors enable touch button operations. This multi-functional design eliminates the need for separate physical buttons, improving both aesthetic appearance and user convenience by providing versatile interaction options within a single component arrangement.
2Ease of operation
If the fingerprint identification sensor is pressed for a certain distance to trigger the physical button, then the touch button function is activated, but the user must apply precise pressure which reduces operational convenience
Solution Approach 1:
The patent replaces the mechanical pressure-based button triggering system with a capacitive sensing system. Instead of requiring the user to press the sensor to a specific distance to trigger the button, the capacitive button sensors detect touch operations through capacitance changes. This substitution eliminates the need for precise pressure control, allowing users to perform touch and press operations with any strength while maintaining both fingerprint identification and touch button functionality.
3Reliability
If a hole is provided in the cover glass for the fingerprint identification sensor, then the sensor can be pressed to work, but the structural integrity and aesthetic appearance are compromised
Solution Approach 1:
The patent extracts the button pressing function from the fingerprint identification sensor area. Instead of requiring the fingerprint sensor to be pressed through a hole in the cover glass, the capacitive button sensors positioned on the sides detect touch operations. This extraction allows the cover glass to remain intact without holes, maintaining both structural integrity and aesthetic appearance while preserving sensor functionality through the capacitive sensing mechanism.
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 solution enhances user convenience by allowing touch and press operations with any strength, improves the device's aesthetic appearance, and integrates fingerprint and touch button functions, while maintaining structural integrity.
Implementation Method 1
collecting a capacitance generated on the cover glass and analyzing the capacitance to obtain a capacitance variation
Data Source
AI summary
An apparatus for realizing a touch button and fingerprint identification, includes: a fingerprint identification sensor, disposed below a cover glass of a touch screen of a terminal device; and a capacitive button sensor, disposed below the cover glass and located on at least one side of the fingerprint identification sensor.