Mobile Terminal Rear Input with Integrated Fingerprint Sensor
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Solution Overview
Problem
Mobile terminals face challenges in enhancing security for self-authentication methods, particularly with finger scan sensors, as existing implementations increase thickness due to separate flexible printed circuit boards for input and scanning functions, and may not provide robust enough authentication for payment processes.
Innovation Solution
A mobile terminal design incorporating a finger scan sensor integrated with a rear input unit, utilizing separate flexible printed circuit boards for independent operation of input and scanning functions, with a fixing member and supporting structure to maintain slimness and robustness, allowing for simultaneous performance of scanning and other functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a finger scan sensor is provided at a rear surface of a mobile terminal with separate flexible printed circuit boards for input and scanning functions, then the authentication security is improved, but the thickness of the mobile terminal increases
Solution Approach 1:
The patent combines the finger scan sensor and rear input unit into a single integrated assembly. The sensor housing contains both the finger scan sensor and rear input unit, with a single flexible printed circuit board carrying both the scanning electrode and input electrode. This merging eliminates the need for separate flexible printed circuit boards, reducing terminal thickness while maintaining authentication security through the integrated fingerprint scanning capability.
2Adaptability or versatility
If separate flexible printed circuit boards are used for input and scanning functions, then the functional independence is improved, but the device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing a single flexible printed circuit board that serves dual purposes: it carries both the scanning electrode for fingerprint authentication and the input electrode for rear button input functions. The sensor housing integrates both the finger scan sensor and rear input unit, allowing one circuit board to support multiple functions without compromising functional independence, as each function operates through its dedicated electrode on the same board.
Data Source
AI summary
The present invention relates to a mobile terminal, which includes a case covering a rear surface of a terminal body, a rear input unit provided at an inner side of the case, externally exposed through the case, and including a first button unit for inputting a first function, and a second button unit for inputting a second function, wherein the first button unit is externally exposed through the second button unit, and a fixing member provided at an inner side of the rear input unit, and capable of fixing the first button unit by being accommodated in a recess outwardly formed in the second button unit, wherein the fixing member is coupled to the second button unit and a finger scan sensor is provided on the first button unit.