Touch-Sensitive Display Gesture Recognition Thresholds
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Solution Overview
Problem
Existing touch-sensitive display technologies face challenges in accurately distinguishing between separate touches and gestures on portable electronic devices, often leading to incorrect identification of touches as single or multiple events, which can result in misinterpretation of user inputs.
Innovation Solution
A method and electronic device configuration that detect a first and second touch on a touch-sensitive display, determining if the distance and time thresholds are met to identify the second touch as separate or associated with the first touch, utilizing a processor to analyze touch location data and report accurate touch events to the application layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch data from successive frames is analyzed to determine trajectory and distinguish separate touches, then user input recognition accuracy is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-defining distance thresholds and time thresholds before touch analysis begins. These thresholds are established in advance to guide the classification of touch events, allowing the system to quickly compare incoming touch data against predetermined criteria rather than performing complex real-time calculations. This reduces processing complexity while maintaining accurate distinction between separate touches and gestures.
Solution Approach 2:
The patent utilizes parameter changes by varying the distance threshold and time threshold parameters to adapt to different touch scenarios. By adjusting these parameters, the system can differentiate between deliberate separate touches (larger distance, longer time interval) and accidental touches or gestures (smaller distance, shorter time interval). This parameter-based approach simplifies the decision-making process while improving touch event interpretation accuracy.
2Measurement precision
If distance threshold and time threshold criteria are applied to identify separate touches, then new touch detection accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The patent employs parameter changes by implementing distance threshold and time threshold as adjustable criteria for touch classification. The distance threshold defines the spatial separation required to consider two touches as separate events, while the time threshold defines the temporal interval needed to distinguish sequential touches. By changing these parameters based on the specific touch scenario, the system achieves high detection accuracy without requiring complex signal processing algorithms.
Solution Approach 2:
The patent applies local quality by applying different threshold criteria to different aspects of touch analysis. Specifically, distance threshold is applied to spatial separation analysis, while time threshold is applied to temporal interval analysis. This localized application of quality criteria allows the system to handle complex touch scenarios through simple, targeted comparisons rather than comprehensive complex processing.
3Measurement precision
If multiple touch data sets from adjacent time frames are analyzed, then gesture recognition accuracy is improved, but processing time and computational load increase
Solution Approach 1:
The patent applies preliminary action by pre-establishing the distance threshold and time threshold values before gesture recognition begins. These predetermined thresholds serve as ready-made criteria that can be quickly applied to multiple touch data sets from adjacent time frames without requiring complex real-time computation. This allows the system to analyze multiple time frames for improved gesture recognition accuracy while minimizing additional processing time.
Solution Approach 2:
The patent implements partial action by analyzing only the necessary elements from adjacent time frames - specifically comparing touch locations against the predetermined distance threshold and time intervals against the time threshold. Rather than performing exhaustive analysis of all possible touch combinations and trajectories, the system focuses on the critical parameters (distance and time) that most directly determine whether touches are separate events or gestures, thus reducing computational load while maintaining recognition accuracy.
Data Source
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AI summary
A method includes detecting a first touch at a first touch location on a touch-sensitive display, detecting a second touch at a second touch location on the touch-sensitive display, and when a first distance from the first touch location to the second touch location meets a distance threshold and a second distance from the previous touch location to the first touch location does not meet the distance threshold, identifying the second touch as a new touch.