High Integrity Touch Screen Dual Sensor Validation
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Solution Overview
Problem
Current touch screen systems in avionics and high-integrity applications often require multiple actions from operators to confirm commands, which is cumbersome and increases workload, especially in emergency situations, and have a higher error rate than desired for critical systems.
Innovation Solution
A high integrity touch screen system utilizing two independent sensor arrays and processors to detect and validate touch positions, allowing for single-action command execution by ensuring coincidence between the detected touch coordinates from both arrays before processing the command.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensor arrays and processors are used to validate touch positions, then system reliability is improved, but device complexity increases
Solution Approach 1:
The system divides the touch detection function into two independent sensor arrays, each with its own processor. This segmentation allows parallel validation of touch positions, improving reliability through redundancy while maintaining manageable complexity by keeping each sensor array and processor pair as a separate, modular unit.
Solution Approach 2:
The system creates a duplicate detection path with a second sensor array and processor that mirrors the first. This copying approach enables cross-validation of touch coordinates without requiring completely new detection mechanisms, achieving enhanced reliability through redundancy while leveraging the existing sensor array and processor design.
2Ease of operation
If single-action command execution is enabled, then ease of operation is improved, but error rate increases
Solution Approach 1:
The system performs preliminary validation by comparing touch coordinates from both sensor arrays through their respective processors before executing the command. This preliminary cross-validation ensures accuracy is confirmed in advance, allowing single-action execution without increasing error rates because the validation is already complete before the action is taken.
Solution Approach 2:
The system implements feedback by having the second processor verify the touch position detected by the first sensor array and processor. This feedback mechanism ensures that only validated touch positions trigger commands, maintaining low error rates while enabling single-action execution since the feedback validation occurs automatically before execution.
Data Source
AI summary
A high integrity touch screen system includes, but is not limited to, a display screen, a first sensor array to detect a touch on the display screen and to generate a first set of touch position coordinates, a first processor connected to the first sensor array and configured to receive the first set of touch position coordinates, a second sensor array to detect the touch on the display screen and to generate a second set of touch position coordinates and a second processor connected to the second sensor array and configured to receive the second set of touch position coordinates. The first processor and the second processor cooperate to compare the first set of touch position coordinates with the second set of touch position coordinates and to invalidate the touch when the first set of touch position coordinates and the second set of touch position coordinates do not substantially coincide.