Touch Position Analysis Using Zero-Crossing Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch display technologies face challenges in accurately determining the number of touches and positions, especially when multiple touches are close together, as signal values tend to concentrate and a single threshold cannot differentiate between single and multiple touches.
Innovation Solution
A method and device that analyze sensing information using zero-crossings, allowing for the determination of touch positions even when the number of zero-crossings differs from the actual number of touches, by employing a controller to identify positions based on positive and negative thresholds and performing zero-crossing position analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single threshold is used to determine touch positions, then the device complexity is reduced, but the measurement precision deteriorates when multiple touches are close together
Solution Approach 1:
The patent segments the touch detection process into multiple stages: first identifying zero-crossing points in the sensing signal, then performing curve fitting on segments between these zero-crossings to locate peaks. This segmentation allows accurate detection of multiple close touches by treating each segment independently, resolving the contradiction between simple thresholding and precise multi-touch detection.
2Device complexity
If signal values are analyzed directly without zero-crossing analysis, then the analysis process is simpler, but the reliability of position determination deteriorates when signal paths cross
Solution Approach 1:
The patent introduces zero-crossing points as intermediary reference markers that divide the sensing signal into distinct segments. These zero-crossings serve as reliable mediators that indicate the presence and boundaries of touches, even when signal paths cross or concentrate. By using these intermediary points, the system achieves reliable position determination without requiring complex direct signal analysis.
Data Source
AI summary
The method and device for analyzing position are disclosed. By analyzing sensing information with at least one zero-crossing, each position can be analyzed. The number of analyzed positions may be different from the number of zero-crossings. When the number of analyzed positions is different from the number of zero-crossing, the number of analyzed positions is more than one.