Fingerprint Sensor Configuration Adjustment for Display Protection
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Solution Overview
Problem
The attachment of protective members such as protective films or tempered glass to the display of electronic devices increases the distance between touch sensors and conductors, leading to reduced sensitivity in detecting touch inputs, including fingerprint information.
Innovation Solution
An electronic device that includes a touch display with a touch sensor controller, a fingerprint sensor beneath the display, and a processor that adjusts the configuration data for the fingerprint sensor based on capacitance data obtained from touch inputs, thereby maintaining sensing performance even with protective members attached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective member (protective film or tempered glass) is attached to the display surface, then the display is protected from external impact, but the distance between the touch sensor and the conductor increases, reducing touch sensitivity and fingerprint detection accuracy
Solution Approach 1:
The patent adjusts configuration parameters of the fingerprint sensor based on the thickness of the attached protective member. By changing operational parameters such as sensing threshold, integration time, or signal processing gains in response to the protective member's thickness, the system maintains fingerprint detection accuracy despite the increased distance caused by the protective layer.
2Strength
If a protective member is attached to the display surface, then the display is protected from external impact, but touch sensor sensitivity is reduced due to increased distance between sensor and conductor
Solution Approach 1:
The system dynamically adjusts touch sensor configuration parameters based on the detected protective member thickness. By modifying parameters such as capacitance threshold, sampling rate, or signal amplification, the touch sensor maintains adequate sensitivity for user interaction even when a protective member is present.
Solution Approach 2:
The patent implements a feedback mechanism where the system detects the presence and thickness of a protective member, then uses this information to adjust sensor parameters. This closed-loop approach ensures that the sensor performance is optimized for the current operational condition, maintaining both protection and sensitivity.
3Area of stationary object
If the fingerprint sensor is disposed beneath the display to enable larger display area, then the display area is increased, but the sensing performance deteriorates when a protective member is attached due to increased distance
Solution Approach 1:
The patent compensates for the performance degradation caused by the protective member by adjusting fingerprint sensor configuration parameters. Based on the detected protective member thickness, the system modifies parameters such as illumination intensity, exposure time, or signal processing thresholds to maintain reliable fingerprint authentication despite the additional distance.
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 enables the electronic device to accurately detect fingerprint information even when a protective member is attached, improving usability by maintaining optimal fingerprint sensor performance.
Implementation Method 1
the display may include a touch sensor based on a capacitance method, and the capacitive touch sensor may be sensitive to a distance between conductors
Data Source
AI summary
An electronic device is provided. The electronic device includes a touch display including a touch sensor controller, a fingerprint sensor disposed beneath the touch display, a processor, and memory storing instructions that, when executed by the processor, cause the electronic device to: in response to a touch input to the touch display, obtain, via the touch sensor controller, capacitance data, adjust configuration data for the fingerprint sensor based on the capacitance data, and obtain fingerprint information corresponding to the touch input, using the fingerprint sensor operating with the adjusted configuration data.