AMOLED AOR Adjustment for Fingerprint Accuracy and Burn-In Control
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Solution Overview
Problem
The performance of sensor modules, such as fingerprint and illuminance sensors, is affected by the luminance or on-off duty ratio (AOR) of the display panel, leading to issues like flickering and burn-in deviations in portable electronic devices.
Innovation Solution
Adjusting the AMOLED off ratio (AOR) of the display panel to a specified minimum value during fingerprint authentication, using a processor to identify and linearly adjust the AOR based on the luminance setting value, and applying conversion offsets to compensate for burn-in deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display panel operates with high luminance or high AOR to maintain display quality, then display visibility is improved, but sensor module performance deteriorates due to flickering and burn-in deviations
Solution Approach 1:
The system dynamically adjusts the AOR parameter based on operational context. During fingerprint authentication, the processor lowers the AOR to minimize flickering and burn-in effects on the sensor. During normal display operation, the AOR is maintained at higher values for optimal display visibility. This dynamic parameter adjustment resolves the contradiction by adapting display characteristics to operational requirements.
Solution Approach 2:
The processor changes the AOR parameter from its normal operating value to a reduced value specifically during fingerprint authentication operations. This parameter change allows the display to maintain adequate visibility while minimizing interference with the optical fingerprint sensor, thereby improving sensor performance without permanently compromising display quality.
2Measurement precision
If the AOR is reduced to improve fingerprint sensor performance, then sensor accuracy is improved, but display quality may deteriorate due to increased flickering
Solution Approach 1:
The system implements dynamic AOR adjustment that is temporally localized to fingerprint authentication operations. The processor temporarily reduces AOR only during the brief period when fingerprint sensing is active, then restores the normal AOR value afterward. This temporal dynamics ensures fingerprint accuracy is improved without causing persistent display flickering that would compromise overall display stability.
Solution Approach 2:
The AOR reduction is applied periodically and transiently during fingerprint authentication events rather than continuously. This periodic action allows the display to maintain stability during normal operation while providing optimized conditions for sensor performance during authentication, thus resolving the contradiction between measurement precision and system stability.
3Area of stationary object
If multiple sensor modules are arranged to overlap the display to increase display area, then display area is increased, but sensor performance deteriorates due to light interference from the display
Solution Approach 1:
The processor changes the AOR parameter to a reduced value during sensor operation to minimize light emission from the display. This parameter change reduces the luminance interference that would otherwise degrade sensor performance, allowing the overlaid sensor modules to function accurately while the display maintains its expanded area configuration.
Solution Approach 2:
The system dynamically controls display luminance through AOR adjustment during sensor operation. By making the display luminance adaptive rather than static, the system allows the display area to remain expanded while minimizing light interference with sensors only when and where needed, thus maintaining both display area and sensor performance.
Data Source
AI summary
An electronic apparatus and/or method which may improve the performance of a sensor module. An electronic apparatus may include: a display panel; a fingerprint sensor arranged to overlap at least part of the display panel; and a processor operatively connected to the display panel and the fingerprint sensor, wherein the processor may: execute a fingerprint authentication function using the fingerprint sensor; identify an AMOLED off ratio (AOR) and luminance setting value of the display panel on the basis of the fingerprint authentication function being executed; linearly adjust the AOR according to a section to which the luminance setting value belongs or set the AOR to a designated minimum value; and perform fingerprint authentication by using the fingerprint sensor while the AOR is maintained at the minimum value. The present disclosure may further include various other embodiments.