Touch Panel Distance Detection for Unintended Activation Prevention
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Solution Overview
Problem
Touch panels often activate unintended functions due to slight touches, making it difficult for users to recognize the intended touch position, leading to erroneous operations.
Innovation Solution
An electronic apparatus with a touch panel that detects the distance between an instruction body and the screen, activating functions only when the distance becomes shorter than a certain threshold after a prescribed time, and providing distinct displays and vibrations to indicate successful or failed inputs, thereby preventing unintended activations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the touch panel activates a function with only a slight touch, then the ease of operation is improved, but the reliability deteriorates due to unintended touches and erroneous operations
Solution Approach 1:
The patent changes the parameter of touch detection from simple contact detection to distance-based detection with multiple thresholds. By monitoring the distance between the instruction body and touch panel over time, and comparing it against first and second distances, the system can distinguish between intentional slow movements and accidental quick touches, thereby improving reliability while maintaining ease of operation for intended actions
Solution Approach 2:
The patent implements feedback by providing display changes and vibrations to indicate whether a function activation was successful or failed. This feedback mechanism allows users to understand the system's response to their touch, reducing erroneous operations and improving the overall reliability of the interaction
2Reliability
If the touch panel requires a prolonged state before activating a function, then the reliability is improved by preventing unintended activations, but the productivity deteriorates due to increased operation time
Solution Approach 1:
The patent applies dynamics by making the detection criteria adaptive rather than static. The system monitors the temporal evolution of the distance parameter and adjusts its decision based on whether the slow movement state persists for a prescribed time. This dynamic approach allows reliable distinction between intentional and unintended touches without requiring excessively long detection periods, thus balancing reliability and productivity
3Loss of information
If the touch panel provides display changes to indicate function activation, then the loss of information is reduced by improving user recognition, but the device complexity increases
Solution Approach 1:
The patent uses feedback through display changes and vibrations to communicate the system state to the user. By providing visual and haptic feedback about whether a touch was registered successfully or failed, the system reduces information loss and improves user awareness without requiring complex additional hardware, as the feedback utilizes existing display and vibration capabilities
Data Source
AI summary
A control unit causes a first display and a first vibration when a finger has continued to exist in a first X-Y region of a touch panel and a first Z region for a prescribed time. When the finger being in a second X-Y region of the touch panel enters a second Z region from the first Z region, the control unit activates a prescribed function and causes a second display and a second vibration. When the finger being in the second X-Y region enters the second Z region before the finger continues to exist in the first Z region for the prescribed time, the control unit causes only a third display and a third vibration without activating the prescribed function.