Foldable Display Pinhole Fingerprint Sensor Misalignment Calibration
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Solution Overview
Problem
Display devices with embedded pinhole optical systems for fingerprint detection face challenges in maintaining accurate alignment between the pinhole optical system and the optical sensor, especially when the device is folded or bent, leading to reduced signal-to-noise ratio (SNR) and decreased fingerprint detection accuracy.
Innovation Solution
A method and system that includes a pinhole optical system and an optical sensor in a display device, where misalignment information is detected, and calibration data is generated by selecting and interpolating reference data to correct fingerprint sensing data, improving alignment and SNR, even when the device is folded or bent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the device is folded or bent to achieve flexibility and adaptability, then the adaptability improves, but the alignment between the pinhole optical system and the optical sensor deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple calibration data sets corresponding to different folding angles (0°, 45°, 90°, 135°, 180°) before actual fingerprint detection. When the device is folded to any angle, the system selects or interpolates the appropriate calibration data from these pre-prepared sets, eliminating the need for real-time recalibration and maintaining alignment accuracy throughout the folding range.
Solution Approach 2:
The patent implements dynamics by making the calibration data selection adaptive to the actual folding angle. The system dynamically determines the folding angle using sensing signals from the touch sensor, then selects or interpolates calibration data accordingly. This dynamic adaptation ensures that the pinhole optical system and optical sensor remain aligned regardless of the device's folding state.
2Measurement precision
If calibration data is generated for multiple reference folding angles to maintain accuracy across different folding states, then the fingerprint detection accuracy improves, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by organizing calibration data according to the folding angle parameter. Instead of storing separate calibration data for every possible angle, the system stores calibration data for key reference angles (0°, 45°, 90°, 135°, 180°) and uses linear interpolation to calculate calibration data for intermediate angles. This parameter-based organization reduces storage requirements while maintaining accuracy across the entire folding range.
Solution Approach 2:
The patent uses copying by creating interpolated calibration data sets for intermediate folding angles based on the reference angle data. Rather than manually calibrating each angle, the system copies and transforms the reference calibration data through linear interpolation to generate appropriate calibration parameters for any folding angle, significantly reducing the complexity of calibration data management.
3Manufacturing precision
If linear interpolation is used to generate calibration data for intermediate folding angles, then the alignment accuracy across all folding angles improves, but the computational processing time increases
Solution Approach 1:
The patent applies partial action by performing linear interpolation only when necessary - specifically when the detected folding angle does not exactly match a reference folding angle. If the folding angle coincides with a reference angle, the system directly uses the corresponding calibration data without interpolation. This selective approach reduces computational overhead while maintaining alignment accuracy when needed.
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
The method enhances fingerprint detection accuracy and authentication performance by correcting for misalignment between the pinhole optical system and the optical sensor, improving the signal-to-noise ratio and maintaining high accuracy during device folding or bending.
Implementation Method 1
a display panel including a pinhole optical system and an optical sensor overlapping the pinhole optical system
Data Source
AI summary
A display device includes a display panel including a pinhole optical system and an optical sensor overlapping the pinhole optical system. A fingerprint detection method which detects a user's fingerprint using the display device includes obtaining fingerprint sensing data by sensing a user's fingerprint using the display device, detecting misalignment information indicating a degree of misalignment between the pinhole optical system and the optical sensor, generating calibration data using at least one piece of reference data corresponding to at least one reference folding angle according to the detected misalignment information, generating fingerprint data by correcting the fingerprint sensing data using the calibration data, and detecting the user's fingerprint according to the fingerprint data.