Fingerprint Sensor Calibration via Marker Movement Tracking
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Solution Overview
Problem
Existing display devices with fingerprint sensors face challenges in accurately acquiring fingerprint images when the sensor moves, leading to noise interference and reduced recognition rates due to pre-stored calibration data being ineffective in correcting for positional changes.
Innovation Solution
A display device and method that utilize a sensor controller to calculate the movement of a marker in a test image, update calibration image data, and apply a weight value map to correct fingerprint images, ensuring accurate fingerprint recognition even when the sensor is moved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pre-stored calibration data is used for fingerprint sensing, then initial calibration is simplified, but the calibration becomes ineffective when the sensor moves
Solution Approach 1:
The patent transforms the static calibration approach into a dynamic one by continuously updating calibration data based on real-time sensor position detection. The sensor controller detects marker positions in multiple images, calculates sensor movement, and updates calibration data accordingly, making the calibration system adaptive to sensor movement rather than fixed.
Solution Approach 2:
The system implements feedback by using detected marker positions to calculate sensor movement and feed this information back into the calibration data update process. The sensor controller continuously monitors marker positions, computes displacement, and adjusts calibration data based on this feedback loop, ensuring calibration remains accurate despite sensor movement.
2Adaptability or versatility
If the sensor moves during fingerprint acquisition, then flexibility in sensor placement is improved, but noise interference increases and recognition rates decrease
Solution Approach 1:
The patent uses marker patterns as reference copies to track sensor position. By detecting the position of known marker patterns in captured images and comparing them across multiple frames, the system creates a reference framework that allows it to calculate sensor movement and compensate for position changes, maintaining measurement precision despite movement.
3Reliability
If calibration data is updated dynamically based on marker movement, then fingerprint recognition accuracy is maintained, but system complexity increases
Solution Approach 1:
The patent introduces marker patterns as an intermediary element between the sensor and the calibration process. These markers serve as reference objects that simplify the calculation of sensor movement by providing easily detectable, high-contrast features. The markers mediate the complex task of tracking sensor position by transforming it into a simpler pattern recognition and position calculation problem.
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 approach enables the acquisition of fingerprint images with reduced noise and improved recognition rates, even when the sensor's location changes, by dynamically updating calibration data based on marker movement.
Implementation Method 1
a sensor that includes a plurality of light sensing pixels configured to receive light and acquire a first image
Data Source
AI summary
A display device includes: a display portion that includes a plurality of pixels, and displays an image through light emitted from the plurality of pixels; a sensor that includes a plurality of light sensing pixels that receive light and acquires a first image when the display portion displays a test image that includes a marker; a memory that stores calibration image data for calibrating an image acquired by the sensor; and a sensor controller that calculates a movement amount of a marker in the first image and corrects or updates the calibration image data using the movement amount of the at least one marker.