Touch Trace Detection Beyond Area Boundary
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Solution Overview
Problem
Existing touch-sensitive electronic devices fail to correctly detect touch traces that start outside the defined touch area, leading to incorrect user responses, especially during power-saving modes where the touch module is in hibernation and cannot immediately detect events outside the touch area.
Innovation Solution
An electronic device comprising a touch module and a processing module that determines whether a touch trace started beyond the touch area by analyzing the distance of the first touch event from the touch area boundary within a defined range, with a larger range for subsequent events, and optionally using speed and extrapolation to accurately identify traces originating outside the touch area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the touch module enters hibernation mode to save power, then power consumption is reduced, but the ability to detect touch events outside the touch area is lost
Solution Approach 1:
The system performs preliminary actions by calculating the expected touch area boundary based on the first touch event's position and speed before the touch module fully enters hibernation mode. This allows the system to anticipate where subsequent touch events should occur and adjust the detection boundary accordingly, ensuring accurate detection even when the touch module is in a low-power state.
Solution Approach 2:
The detection boundary is made dynamic rather than fixed. The system adjusts the effective touch area boundary based on real-time analysis of touch event positions, speeds, and trajectories. This dynamic boundary expansion allows the system to detect touch events that originate outside the physical touch module area while the module remains in hibernation mode.
2Measurement precision
If the touch module scans continuously to detect all touch events, then detection accuracy is maintained, but power consumption increases
Solution Approach 1:
Instead of continuous scanning, the touch module uses periodic scanning combined with predictive boundary calculation. The system periodically wakes from hibernation mode, calculates the expected touch boundary based on recent touch patterns, and scans only within this expanded boundary. This periodic action with adaptive boundaries maintains detection accuracy while significantly reducing power consumption compared to continuous scanning.
3Adaptability or versatility
If the touch area boundary is expanded to capture external touch events, then detection coverage is improved, but the risk of false detection increases
Solution Approach 1:
The system implements feedback mechanisms by continuously analyzing the positions, speeds, and trajectories of detected touch events to refine the expected touch boundary calculation. The feedback from actual touch patterns allows the system to adjust the detection boundary dynamically, reducing false detections while maintaining comprehensive coverage. The system learns from touch behavior patterns to distinguish between legitimate external touch events and spurious signals.
Data Source
AI summary
The present invention provides a method for detecting a touch trace starting beyond a touch area. The method comprises the following steps: receiving touch events happened in the touch area detected by a touch module; plotting a touch trace according to the touch events outputted from the touch module; determining whether a first touch trace beginning with a first point as the touch trace starting beyond the touch area; and determining whether a second touch trace beginning with a second point as the touch trace starting beyond the touch area, wherein the first point is within a first range to a boundary of the touch area and the second point is within a second range to the boundary, and the second range is larger than the first range.