Under-Display Fingerprint Sensor Tuning for Edge Image Clarity
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Solution Overview
Problem
Existing display devices with fingerprint recognition functionality suffer from optical fingerprint sensors that cause fingerprint images to appear darker at edges and brighter at the center, leading to overexposure and blurring at the edges, reducing sensitivity.
Innovation Solution
An electronic device with a fingerprint recognition region divided into a central and edge region, where the controller adjusts the performance parameters of photosensitive units in the edge region to be better than those in the central region, including gain, exposure duration, and sensitivity, to improve image sharpness and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a uniform bright spot pattern is used to fill light, then the fingerprint image center is well illuminated, but the edges become overexposed and blurred
Solution Approach 1:
The patent applies local quality by adjusting the brightness of different regions of the display screen. Specifically, the center region displays a first brightness while the edge region displays a second brightness that is lower than the center. This creates a non-uniform illumination pattern that compensates for the optical characteristics of the lens, ensuring that both center and edge regions of the fingerprint image have appropriate illumination without overexposure.
2Manufacturing precision
If the edge region brightness is reduced to improve sharpness, then edge imaging clarity improves, but overall illumination intensity decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the brightness parameter of the display screen in different regions. The controller sets the center region brightness to a first value and the edge region brightness to a second value (lower than the first). This parameter adjustment compensates for the lens's optical characteristics, ensuring that the edge region receives sufficient light without overexposure, thereby maintaining both sharpness and adequate illumination.
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 solution enhances the overall sharpness and sensitivity of fingerprint recognition by compensating for the optical properties of the sensor, ensuring clearer fingerprint images are collected.
Implementation Method 1
an optical sensor, configured to collect a fingerprint image of a target object and including a plurality of photosensitive units
Data Source
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AI summary
Provided in an embodiment of the present invention is an electronic apparatus. The electronic apparatus comprises a display panel, an optical sensor and a controller. The display panel has a fingerprint recognition zone. The fingerprint recognition zone comprises a central region and a peripheral region surrounding the central region. The optical sensor is provided corresponding to the fingerprint recognition zone. The optical sensor is used to capture a fingerprint image of a target object. The optical sensor has a plurality of light-sensing units. The controller controls a performance parameter of the light-sensing unit corresponding to the peripheral region to be superior to a performance parameter of the light-sensing unit corresponding to the central region. The electronic apparatus provided in the embodiment of the present invention facilitates improving the clarity of a captured fingerprint image, thereby improving the sensitivity of fingerprint recognition.