Touchscreen Display Inadvertent Input Detection
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Solution Overview
Problem
Touch screen displays, especially in critical domains like healthcare, are susceptible to inadvertent touches and contamination, leading to operational limitations and potential safety risks due to their susceptibility to inadvertent inputs.
Innovation Solution
A touch screen display system that senses touch down and touch off states, uses a processor to start a counter for persistent touches, and alters the graphical user interface to present alerts if a touch state persists beyond a predetermined count, thereby distinguishing between intended inputs and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch screen displays are used to improve user interface interaction, then ease of operation is improved, but susceptibility to inadvertent touches and contamination increases
Solution Approach 1:
The system performs preliminary detection by monitoring touch duration and comparing it against a threshold before executing the intended action. This preliminary action (duration checking) prevents inadvertent inputs by distinguishing between intentional touches and accidental contacts, thereby resolving the contradiction between ease of operation and reliability
2Speed
If touch duration threshold is set low to respond quickly to inputs, then speed is improved, but false detection of interference increases
Solution Approach 1:
The system changes the parameter of touch duration threshold to an optimized value that balances response speed and detection accuracy. By adjusting this parameter, the system achieves both quick response to valid inputs and accurate discrimination against interference, resolving the contradiction between speed and measurement precision
3Reliability
If touch duration threshold is set high to filter interference, then reliability is improved, but response time to valid inputs increases
Solution Approach 1:
The system optimizes the touch duration threshold parameter to a value that provides sufficient filtering of interference while minimizing the time delay for valid inputs. This parameter optimization resolves the contradiction between reliability and time loss by finding the optimal balance point
Data Source
AI summary
A touchscreen display device and method of user input control therefor includes a graphical display that senses at least a touch down state and a touch off state at a plurality of locations displaying information. A processor is configured to receive the touch down states and touch off states at each of the plurality of locations. The processor is configured to measure an elapsed time from receipt of at least one touch down state at a subset of the plurality of locations. The processor further is configured to alter the display of information at the subset of locations if the touch down state persists beyond a predetermined elapsed time indicative of an interference.