Touch Sensing Device Tracking Error Prevention
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Solution Overview
Problem
Existing touch sensing devices experience tracking errors when the distance between touch coordinates is within a predetermined threshold value, particularly during drum touches, leading to incorrect line representation on the screen.
Innovation Solution
A touch sensing device comprising a touch coordinate calculation circuit and a touch coordinate tracking circuit that calculates and assigns touch IDs based on distance thresholds and vector analysis to differentiate between drawing and drum touches, preventing tracking errors by using a first vector for the first and second touch coordinates and a second vector for the second and third touch coordinates when the distance is within the threshold value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch sensing device assigns the same touch ID to touch coordinates within a threshold distance, then drawing touches can be continuously tracked, but drum touches are incorrectly identified as drawing touches causing tracking errors
Solution Approach 1:
The patent applies preliminary action by calculating vectors between consecutive touch coordinates in advance (before final ID assignment) to predict touch movement direction. This allows the system to preemptively distinguish drum touches from drawing touches by analyzing the directional consistency of sequential touches, preventing incorrect tracking before it occurs.
Solution Approach 2:
The patent introduces a new dimension of analysis by using vector direction (angular information) in addition to distance thresholds. Instead of relying solely on the one-dimensional distance metric, the system incorporates two-dimensional directional data from vector calculations between touch points, enabling differentiation of touch patterns that have similar distances but different movement directions.
2Measurement precision
If the threshold value is reduced to prevent drum touch tracking errors, then drawing touch continuity may be interrupted
Solution Approach 1:
The patent changes the parameters used for touch classification by introducing vector direction analysis alongside distance measurement. Instead of adjusting only the distance threshold parameter, the system modifies the classification parameters to include angular information from vector calculations, allowing maintenance of a generous distance threshold while still accurately distinguishing drum touches through directional analysis.
Solution Approach 2:
The patent implements feedback by using the calculated vector directions to inform subsequent touch ID assignments. The system continuously monitors the directional relationship between sequential touch coordinates and uses this feedback to make intelligent decisions about whether to assign the same touch ID, thereby maintaining both precision and efficiency without requiring threshold adjustments.
3Reliability
If vector analysis is used to differentiate touch types, then tracking accuracy improves, but computational complexity increases
Solution Approach 1:
The patent applies partial action by using vector analysis selectively rather than for all touch coordinates. The system calculates vectors and performs directional analysis only when needed to resolve ambiguous cases where distance thresholds alone are insufficient to differentiate touch patterns, thereby reducing unnecessary computational overhead while maintaining high recognition reliability.
Solution Approach 2:
The patent segments the touch analysis process into two stages: first, a quick distance-based preliminary classification, and second, a more computationally intensive vector-based directional analysis only for cases that require further differentiation. This segmentation allows the system to minimize overall computational power consumption by applying complex vector calculations only when simpler methods are insufficient.
Data Source
AI summary
The present disclosure relates to a touch sensing device and a touch sensing method, and more particularly, to a touch sensing device and a touch sensing method to prevent a tracking error of touch coordinates.