In-Display Fingerprint Sensor Ambient Light Control
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Solution Overview
Problem
Fingerprint collection in terminal devices is affected by ambient light, leading to overexposure and reduced quality of fingerprint images due to the entire fingerprint collection area sensing ambient light signals.
Innovation Solution
An information processing method that determines an effective target area within the fingerprint collection area based on touch input sensing parameters, controlling photosensitive elements to only operate within this area to prevent ambient light from entering and reducing overexposure, ensuring the quality of the fingerprint image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the entire fingerprint collection area is used for fingerprint recognition, then the collection area is maximized, but ambient light enters the collection area causing overexposure and reducing image quality
Solution Approach 1:
The fingerprint collection area is segmented into an effective target area and a non-effective area. The effective target area corresponds to the touch input area where fingerprint recognition should be performed, while the non-effective area is excluded from participation in fingerprint recognition. This segmentation prevents ambient light entering through non-contact regions from causing overexposure, while still utilizing the maximum necessary collection area for quality fingerprint capture.
Solution Approach 2:
Different regions of the fingerprint collection area are assigned different functional qualities. The effective target area maintains full sensitivity for fingerprint recognition, while the non-effective area is excluded from recognition processing. This local differentiation allows the system to optimize image quality by preventing ambient light contamination in specific regions without sacrificing overall collection capability.
2Quantity of substance
If photosensitive elements operate in the entire fingerprint collection area, then collection coverage is maximized, but overexposure occurs due to ambient light intake
Solution Approach 1:
The system dynamically determines the effective target area based on real-time touch input sensing parameters. The effective target area is adjusted according to the actual touch location and pressure distribution, allowing the fingerprint recognition system to adaptively optimize the collection area. This dynamic adjustment ensures that photosensitive elements only process signals from regions with actual finger contact, preventing overexposure while maintaining maximum effective information collection.
Solution Approach 2:
The system uses feedback from touch sensing parameters to determine the effective target area for fingerprint recognition. The touch sensing circuit provides real-time information about finger contact location and pressure, which is used to dynamically adjust the effective target area. This feedback mechanism ensures that the fingerprint collection area is optimized based on actual user interaction, preventing ambient light contamination while maintaining high image quality.
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 effectively reduces ambient light intake in the effective target area, preventing overexposure and enhancing the quality of fingerprint images collected by the fingerprint collection apparatus.
Implementation Method 1
obtaining a touch input occurred in a touch sensing area by a touch sensing circuit of a display screen
Implementation Method 2
controlling photosensitive elements to only operate within this area
Data Source
AI summary
An information processing method includes: obtaining a touch input occurred in a touch sensing area by a touch sensing circuit of a display screen of an electronic device; based on a sensing parameter of the touch input, determining an effective target area within a fingerprint collection area of an in-display fingerprint collection apparatus; and performing a fingerprint recognition process based on the touch input within the effective target area. The fingerprint collection area is smaller than or equal to the touch sensing area.