Rollable Display Fingerprint Scanner Alignment
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Solution Overview
Problem
Portable electronic communication devices, such as smartphones, face challenges in achieving a compact form factor while providing a larger display surface area and incorporating biometric sensors for authentication in a predictable and accessible location, especially when transitioning between open and closed configurations.
Innovation Solution
A rollable display device with a flexible display that retracts for a small form factor and extends for larger display size, featuring a blade assembly with a fingerprint scanner that remains dynamically aligned to a fixed finger area, allowing fingerprint authentication regardless of the display's position, and a translation mechanism to slide the blade assembly relative to the device housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a rollable display is used to provide a larger display surface area, then the display size is improved, but the device complexity increases due to the need for translation mechanisms and dynamic component alignment
Solution Approach 1:
The blade assembly containing the fingerprint scanner is nested within the device housing, allowing it to be stored in a compact form when not in use and deployed when needed. This nesting approach enables the rollable display functionality without permanently increasing the device's external dimensions, resolving the contradiction between display size and device complexity.
Solution Approach 2:
The fingerprint scanner is designed to dynamically translate and align with the finger area as the blade assembly moves between retracted and extended positions. This dynamic alignment mechanism ensures consistent biometric authentication functionality throughout the display's range of motion, addressing the complexity introduced by the rollable display through adaptive component positioning.
2Length of moving object
If the blade assembly is retracted to provide a compact form factor, then the device portability is improved, but the accessibility of the fingerprint scanner deteriorates
Solution Approach 1:
The fingerprint scanner is dynamically positioned to translate with the blade assembly, maintaining alignment with the finger area regardless of whether the blade is retracted or extended. This dynamic positioning ensures the fingerprint scanner remains accessible and functional in both compact and extended configurations, resolving the contradiction between portability and ease of operation.
3Measurement precision
If the fingerprint scanner translates with the flexible display, then the alignment with the finger area is maintained, but the device complexity increases
Solution Approach 1:
The fingerprint scanner is merged with the blade assembly, causing it to translate together with the flexible display as a unified structure. This merging approach maintains precise alignment between the fingerprint scanner and the finger area throughout the display's range of motion while minimizing the number of separate alignment mechanisms needed, thus managing device complexity.
Data Source
AI summary
An electronic device, method, and computer program product provide a predictable external finger area on a “rollable display device” for fingerprint authentication that is dynamically aligned to a fixed finger location on a device housing of the electronic device. The electronic device has a translation mechanism operable to position with a blade assembly having a flexible display that retracts to reduce size of the electronic device for carrying or stowing. The transmission extends the blade assembly to increase display area of a flexible display on a front side of a device housing of the electronic device. A fingerprint scanner that moves with the flexible display is sized to capture a fingerprint at a fixed finger area on a device housing of the electronic device for each position of the blade assembly between the retract position and the extended position. The fingerprint of a user is used to authenticate the user.