Touch Control Liquid Interference Filtering
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Solution Overview
Problem
Liquid on a touch screen interferes with touch operation detection, leading to misoperations and reduced efficiency in executing functions on terminals.
Innovation Solution
A method and apparatus that acquire capacitance signals from multiple locations on a touch screen, determine the presence of liquid, and calculate an effective area for touch operations by filtering out affected locations, allowing accurate execution of functions corresponding to the touch operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid exists on the touch screen, then the touch screen can detect touch operations, but the liquid interferes with detection accuracy causing misoperations
Solution Approach 1:
The patent segments the touch screen detection into multiple sampling points and divides the detection area into multiple regions. By analyzing capacitance values at different locations separately, the system can identify which specific regions are affected by liquid and which remain valid for touch detection, thus maintaining detection accuracy despite liquid presence.
Solution Approach 2:
The patent applies different processing strategies to different regions of the touch screen based on local capacitance characteristics. Regions identified as liquid-affected are excluded from touch detection, while clean regions continue normal detection operations. This localized approach preserves overall system reliability by maintaining functionality in unaffected areas.
2Area of stationary object
If the entire touch area is used for detection, then detection coverage is maximized, but liquid contamination reduces effective detection area
Solution Approach 1:
The patent divides the touch detection area into multiple sampling points and regions, allowing selective use of only those regions not affected by liquid. This segmentation enables the system to maintain the largest possible effective detection area while excluding contaminated portions, thus preserving both area utilization and detection precision.
3Measurement precision
If capacitance signals from all locations are processed, then detection sensitivity is improved, but liquid presence causes false positives
Solution Approach 1:
The patent implements a feedback mechanism where capacitance values from multiple sampling points are continuously monitored and analyzed. The system compares capacitance changes across different regions and uses this feedback to identify patterns characteristic of liquid contamination versus genuine touch operations, thereby distinguishing true touches from false positives caused by liquid.
Solution Approach 2:
The patent analyzes capacitance characteristics locally at each sampling point and region rather than processing all signals uniformly. By identifying regions with abnormal capacitance patterns indicative of liquid presence, the system can exclude these specific locations from touch detection while maintaining sensitive detection in clean regions, thus preserving both sensitivity and reliability.
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 solution effectively eliminates the interference of liquid on touch screens, improving the accuracy and efficiency of touch operations by determining and accounting for the effective area of touch operations, thus enhancing user interaction with terminals.
Implementation Method 1
acquiring, in response to a touch operation detected on a touch screen of a terminal, capacitance signals at a plurality of locations corresponding to the touch operation
Data Source
AI summary
A touch control method includes: acquiring, in response to a touch operation detected on a touch screen of a terminal, capacitance signals at a plurality of locations corresponding to the touch operation; determining, in a case of determining that liquid exists on the touch screen based on the capacitance signals at the plurality of locations, an effective area of the touch operation based on the plurality of locations; and executing a function corresponding to the touch operation based on the effective area of the touch operation.