Folding Display Fingerprint Recognition via Optical Sensing
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Solution Overview
Problem
Current fingerprint recognition technologies on folding displays are inconvenient for multi-finger operation, lead to high installation costs, and provide a poor user experience due to the need for users to flip the device to access the fingerprint recognition area, which is not integrated across the full screen.
Innovation Solution
A device with a first and second display panel, each with a touch surface, where a contact recognition area on the first surface includes a sensing unit to capture user contact information, and the system determines which surface is facing the user to execute corresponding operations, including projecting a virtual touch area on the second surface for correct fingerprint recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitive fingerprint recognition sensor is placed under a dedicated button, then fingerprint recognition function is achieved, but terminal processing complexity increases and thickness increases
Solution Approach 1:
The patent replaces the traditional capacitive sensor system (requiring dedicated buttons and complex sensor integration) with an optical imaging system using the display screen itself as the fingerprint capture medium. The TFT light sensing array film captures reflected light patterns from the fingerprint, substituting mechanical/electrical sensing with optical detection through the display layers.
2Reliability
If a capacitive fingerprint recognition sensor is placed under a dedicated button, then fingerprint recognition function is achieved, but terminal thickness increases
Solution Approach 1:
The patent merges the fingerprint recognition function with the existing display screen structure. The TFT light sensing array film is integrated into the display layers, and the fingerprint capture area coincides with the display area, eliminating the need for separate sensor modules and dedicated button structures, thereby reducing overall terminal thickness.
3Ease of manufacture
If the photodiode film is not disposed over the entire screen, then installation cost is reduced, but user experience deteriorates as users must flip the device to access fingerprint recognition
Solution Approach 1:
The patent makes the fingerprint recognition system universal across both display surfaces of the folding device. By disposing photodiode films on both the first and second display panels, the system enables fingerprint recognition regardless of which surface is facing the user, eliminating the need to flip the device and providing consistent functionality in all orientations.
4Ease of operation
If the photodiode film is disposed over the entire screen, then full-screen fingerprint recognition is achieved, but installation cost increases
Solution Approach 1:
The patent applies photodiode films selectively rather than uniformly across the entire screen. The fingerprint recognition areas are positioned at specific locations on the first and second display panels where fingerprint capture is most effective, reducing material costs and manufacturing complexity while maintaining full operational capability across both surfaces.
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 enables seamless multi-finger fingerprint recognition without requiring users to flip the device, reduces installation costs, and enhances user interaction by allowing full-screen fingerprint recognition on folding displays.
Implementation Method 1
a sensing unit is provided under the contact recognition area, and the sensing unit is configured to capture a user's contact information
Data Source
AI summary
Contact recognition method and device for folding display are provided. When first touch surface and second touch surface are in folded state, if it is determined that first touch surface faces current user, since sensing unit is provided under first touch surface, first touch surface can directly capture first contact information of user. When it is determined that second touch surface is facing current user, processing unit projects the touch recognition area and the second touch part that is currently in contact with first touch surface onto second touch surface correspondingly, user can move second touch part so that virtual second touch part on second touch surface is within virtual touch recognition area. In this way, touch recognition area of first touch surface which is facing away from user can obtain second contact information.