Touch Sensing Device Boundary Accuracy Validation
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Solution Overview
Problem
Conventional touch sensing technologies face accuracy degradation when a touch occurs at the boundary between sensing areas due to differences in touching and sensing times, and are prone to noise, leading to inaccurate touch coordinate calculations.
Innovation Solution
A touch sensing method and device that determine the validity of touch sensitivities using surrounding sensing areas, skipping calculations when sensitivities are invalid and adjusting frequency to mitigate noise by grouping and labeling touch sensitivities based on reference values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch coordinates are calculated using touch sensing values of sensing areas, then touch sensing function is achieved, but accuracy of touch coordinates is degraded when touch occurs at boundary between sensing areas
Solution Approach 1:
The patent changes the parameter of touch sensitivity by introducing a validity determination mechanism that evaluates surrounding touch sensitivities. When a touch occurs at a boundary, the system checks whether surrounding sensing areas also detect touch signals within a valid range. If the surrounding touch sensitivities are below a threshold, the touch sensitivity data is marked as invalid, and coordinate calculation is skipped or adjusted. This parameter-based validation resolves the contradiction by ensuring high accuracy only when reliable data is available.
Solution Approach 2:
The patent implements a feedback mechanism where the validity of touch sensitivity data is determined based on feedback from surrounding sensing areas. The system continuously monitors touch sensitivities in adjacent regions and uses this feedback to validate or invalidate the current touch detection. This feedback loop ensures that boundary touches are accurately recognized only when consistent signals are received from multiple sensing areas, thereby improving both accuracy and reliability.
2Speed
If touch sensing is performed continuously, then touch response is achieved, but noise affects the accuracy of touch sensitivity measurement
Solution Approach 1:
The patent dynamically changes the touch sensing parameters by introducing a validity flag that marks touch sensitivity data as valid or invalid based on surrounding area confirmation. When noise is detected (indicated by invalid surrounding sensitivities), the system adjusts its response by skipping coordinate calculation for that frame. This parameter adjustment allows continuous sensing operation while filtering out noisy measurements, thereby maintaining fast response speed without sacrificing measurement accuracy.
Solution Approach 2:
The patent extracts and separates the validity determination step from the coordinate calculation process. By taking out the validation check as an independent step that evaluates surrounding sensing areas before processing touch coordinates, the system can quickly identify and exclude noisy measurements. This extraction allows the main touch response function to operate continuously while the extracted validation logic filters out inaccurate data, resolving the contradiction between speed and precision.
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
Improves the accuracy of touch coordinates even at boundary areas and effectively avoids noise influence by determining sensitivity validity and adjusting sensing frequency.
Implementation Method 1
The touch sensors may be implemented as capacitive type touch sensors which sense a touch based on a change in capacitance
Data Source
AI summary
A touch sensing method includes receiving touch sensitivities; grouping and labeling touch sensitivities each having at least a first reference value, among the touch sensitivities; determining validity of touch sensitivities in each group, by using a maximum touch sensitivity and surrounding touch sensitivities in each group; and skipping calculation of touch coordinates when the touch sensitivities are not valid. The determining of validity of touch sensitivities determines that touch sensitivities of a corresponding group are invalid, when at least one of surrounding touch sensitivities is equal to or less than a second reference value.