Touch Input Correction via Acoustic Wave Shift Detection
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Solution Overview
Problem
Touch-screen devices suffer from inaccuracy in user input due to the offset between the intended touch location and the actual contact point, leading to incorrect selections, especially when user-selectable options are closely spaced, resulting in reduced accuracy and increased power consumption.
Innovation Solution
A method is implemented to detect touch events on a portable electronic device, sampling touch attributes during the event to determine the actual touch location and shifts in touch location, allowing for the correction of the intended target location based on the directions of shift during pressure application and release, thereby improving input accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If touch-screen devices are made smaller for portability, then device size is reduced, but touch input accuracy deteriorates due to limited space for user input
Solution Approach 1:
The patent replaces mechanical touch input methods with acoustic wave-based input detection. By using surface acoustic waves and detecting their interaction with user input (such as finger gestures), the system achieves accurate input detection without requiring large physical touch surfaces, thus maintaining portability while improving input accuracy.
2Quantity of substance
If closely-spaced user-selectable options are provided on the graphical user interface, then information density is increased, but input accuracy deteriorates because the intended touch location is often not at the point of actual touch contact
Solution Approach 1:
The patent substitutes acoustic wave detection for direct mechanical touch detection. Surface acoustic waves propagate across the display surface and interact with user gestures, allowing the system to detect input location and intent with higher precision than traditional touch screens, even when options are closely spaced.
Solution Approach 2:
The patent introduces surface acoustic waves as an intermediary between the user and the touch-screen display. These acoustic waves serve as a mediator that can detect user input gestures indirectly, providing more accurate location detection compared to direct contact methods, thereby enabling precise input even with closely-spaced options.
3Device complexity
If traditional touch detection methods are used, then device complexity is maintained at acceptable levels, but input accuracy deteriorates leading to increased power consumption from repeated corrections
Solution Approach 1:
The patent replaces complex mechanical touch detection systems with acoustic wave-based detection. This substitution achieves higher input accuracy with potentially simpler system architecture, reducing the need for repeated input corrections and thereby lowering power consumption.
Solution Approach 2:
The acoustic wave system inherently provides its own detection mechanism through the propagation and interaction of surface waves with user gestures. This self-service approach eliminates the need for additional complex sensing components, maintaining acceptable device complexity while achieving improved accuracy and reduced power consumption.
Data Source
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AI summary
A method (110-126) of determining input at a touch-sensitive input surface of a portable electronic device includes detecting a touch event (110) at the touch-sensitive input surface, sampling touch attributes (112) during the touch event, determining an actual touch location (124) and determining at least one shift (120) in touch location based on the touch attributes sampled during the touch event, and determining an input based on the actual touch location and the direction of shift of the touch location (126).