Optical Fingerprint Sensor for Swipe Authentication
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Solution Overview
Problem
Conventional optical fingerprint sensors require users to stop their finger for a predetermined time, which is inconvenient and can lead to security issues, especially in scenarios where subsequent operations are performed without re-authentication.
Innovation Solution
An electronic device with a display and an optical fingerprint sensor that allows fingerprint authentication during a swipe operation, using a camera module under the display to capture fingerprint information while the user swipes, and an information processing unit that corrects and aggregates this information based on operation speed and direction, providing real-time feedback on speed and authentication accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical fingerprint sensor requires the user to stop the finger for a predetermined time, then the fingerprint authentication accuracy is improved, but the user convenience deteriorates and the operation time increases
Solution Approach 1:
The patent applies dynamics by transitioning from a static authentication requirement (finger must stop) to a dynamic capture method (finger can move during swipe). The optical fingerprint sensor captures fingerprint information continuously during the swipe motion, and the information processing unit aggregates this dynamic data to achieve authentication, allowing the finger to remain in motion rather than requiring the user to stop.
Solution Approach 2:
The patent implements continuity of useful action by capturing fingerprint information continuously during the entire swipe motion rather than requiring a pause. The optical fingerprint sensor acquires fingerprint data at multiple points during the swipe, and the information processing unit aggregates this continuous data to form a complete fingerprint sample, eliminating the need for the finger to stop.
2Device complexity
If the optical fingerprint sensor uses a fixed exposure time, then the device complexity is reduced, but the authentication accuracy deteriorates when the swipe speed varies
Solution Approach 1:
The patent applies dynamics by making the exposure time adjustable based on the detected swipe speed. The information processing unit determines the appropriate exposure time dynamically according to the motion speed captured by the touch panel, allowing the system to adapt to varying swipe velocities rather than using a fixed exposure time.
Solution Approach 2:
The patent implements feedback by using the touch panel to detect swipe speed and feeding this information back to the information processing unit, which then adjusts the exposure time accordingly. This closed-loop control ensures that the exposure time is optimized based on the actual swipe conditions.
3Measurement precision
If the optical fingerprint sensor reads all light receiving elements, then the measurement precision is improved, but the acquisition time increases and productivity decreases
Solution Approach 1:
The patent applies segmentation by dividing the light receiving elements into multiple groups and reading them in stages rather than simultaneously. The optical fingerprint sensor reads light receiving elements in a segmented manner according to the swipe direction and speed, processing information from different regions at different times and then aggregating the results.
Solution Approach 2:
The patent implements dynamics by making the reading sequence and timing adaptive to the swipe motion. The information processing unit determines the reading strategy based on the detected swipe speed and direction, dynamically adjusting which light receiving elements are read and when, rather than using a fixed sequential reading pattern.
4Ease of operation
If the system performs fingerprint authentication during swipe operation, then the user convenience is improved, but the reliability of authentication deteriorates due to motion blur and incomplete data
Solution Approach 1:
The patent implements continuity of useful action by continuously capturing fingerprint information during the swipe motion rather than requiring a pause. The optical fingerprint sensor acquires data at multiple time points during the swipe, ensuring continuous capture of the fingerprint characteristics even though the finger is in motion.
Solution Approach 2:
The patent applies feedback by using the touch panel to detect swipe characteristics (speed, direction) and feeding this information back to the optical fingerprint sensor and information processing unit. This feedback enables real-time adjustment of the capture and reading parameters to optimize authentication reliability during motion.
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
Enables convenient and secure fingerprint authentication by allowing swiping motions, improving user experience and security by dynamically adjusting exposure time and reading direction based on operation speed, and providing feedback to ensure accurate authentication.
Implementation Method 1
an optical fingerprint sensor including an imaging element having light receiving elements in an array in a first direction and a second direction on a side opposite to the display surface of the display in a third direction intersecting the first direction and the second direction, and acquiring fingerprint information of a fingerprint moving in contact with the display
Implementation Method 2
The light emitting pixel may output light of different wavelengths on the display surface side of the light receiving element
Implementation Method 3
A polarizing filter may be included between the light receiving element and the display surface, and the light receiving element may sense polarized light through the polarizing filter
Data Source
AI summary
Fingerprint authentication is realized during a swipe operation of a display. An electronic device includes a display, an optical fingerprint sensor, and an information processing unit. The display includes a display surface having light emitting pixels in an array in a first direction and a second direction intersecting the first direction. The optical fingerprint sensor includes an imaging element having light receiving elements in an array in a first direction and a second direction on a side opposite to the display surface of the display in a third direction intersecting the first direction and the second direction, and acquires fingerprint information of fingerprint moving in contact with the display. The information processing unit acquires corrected fingerprint information from the fingerprint information acquired by the optical fingerprint sensor.