Impact Sensor Touch Detection for False Registration
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Solution Overview
Problem
Touch screens often inaccurately detect user-intended touch inputs due to unintentional contacts from objects like clothing, jewelry, or water droplets, leading to annoying and counterproductive false registrations.
Innovation Solution
A touch-sensitive display device equipped with an impact sensor that generates a signal representative of impacts, a computing device to detect peak values, and determine if the rising edge of the signal meets predetermined criteria, thereby confirming user-intended touches and rejecting unintentional ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch screen detects all contact events, then sensitivity to user input is improved, but false detection of unintentional touches increases
Solution Approach 1:
The touch detection function is segmented into two independent sensing systems: a touch sensor for detecting contact events and an impact sensor for detecting impact characteristics. Each sensor handles a specific aspect of touch detection, allowing the system to differentiate between intentional and unintentional touches by combining information from both segments.
Solution Approach 2:
The impact sensor acts as an intermediary that provides additional verification information about the nature of the touch. By introducing this intermediate detection layer, the system can filter out false positives from unintentional contacts while maintaining sensitivity to genuine user input.
2Reliability
If impact sensor is added to verify touch intent, then false detection is reduced, but device complexity increases
Solution Approach 1:
The impact sensor serves multiple functions: it detects impact events, determines impact characteristics (rising edge magnitude), and provides verification information for touch intent. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The impact sensor utilizes the natural impact generated by the touch itself to provide verification information. The touch event creates an impact signal that automatically serves as verification data, eliminating the need for separate verification mechanisms or additional active components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of recognizing user-intended touches by minimizing the effects of vibrational noise and false registrations, improving the reliability of touch input detection.
Implementation Method 1
an impact sensor attached to the touch-sensitive display and configured to generate a signal representative of impact to the touch-sensitive display
Data Source
AI summary
Display devices and methods for detecting user-intended touch input are provided. An example display device includes a touch-sensitive display. Further, the display device includes an impact sensor attached to the touch-sensitive display and configured to generate a signal representative of an impact of the touch-sensitive display. The display device also includes a computing device configured to receive the signal. The computing device is also configured to detect a peak of the signal. Further, the computing device is configured to determine whether a rising edge of a magnitude of the peak detected signal meet predetermined criteria. The computing device is also configured to indicate detection of user-intended touch in response to determining that the predetermined criteria are met.