Display Assembly Leak Testing Using Differential Pressure Sensing
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Solution Overview
Problem
Existing methods for testing the sealing integrity of electronic display assemblies, particularly those in ruggedized housings, are unreliable as they do not effectively detect small or internal leaks, and water ingress testing does not provide a strong indication of actual leakage.
Innovation Solution
Incorporating differential pressure sensors to measure pressure differentials between closed loop airflow pathways and ambient air, and manipulating airflow conditions to detect leaks by monitoring pressure changes over time, which can indicate the sealing integrity and location of leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If water ingress testing is used to detect leaks, then the testing method is simple and easy to perform, but the detection reliability is insufficient for small or internal leaks
Solution Approach 1:
The patent replaces the mechanical water-based testing system with a pneumatic/differential pressure sensing system. Instead of using water to detect leaks, the system uses differential pressure sensors to measure pressure differentials across sealed areas, enabling detection of small or internal leaks that water testing cannot reliably detect while maintaining operational simplicity.
2Measurement precision
If differential pressure sensors are installed to improve leak detection accuracy, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent introduces differential pressure sensors as intermediary devices that indirectly measure leak conditions by detecting pressure differentials rather than directly detecting leaks. This intermediary approach enables precise measurement of sealing integrity while keeping the overall system relatively simple, as the sensors can be integrated into existing sealed areas without requiring complex testing apparatus.
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
Provides a more reliable method to assess the sealing integrity of electronic display assemblies by accurately identifying leaks and their locations, enabling timely maintenance and reducing the risk of environmental exposure.
Implementation Method 1
one or more differential pressure sensors may be provided at such units to measure pressure differentials between circulating gas in closed loops or other fully or partially sealed areas
Data Source
AI summary
Display assemblies and related systems and methods providing field leak testing are disclosed. An electronic display assembly includes an electronic display, a differential pressure sensor fluidly connected to an ambient environment and an internal area, and fan(s) located within, or fluidly connected with, the internal area. Differential pressure readings are taken before and while and/or after to command a speed of the fan(s) to be temporarily increased. Where an insufficient change is provided, indication of a probable leak is provided.