UV-Visible Liquid Contact Indicator with Porous Layer
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Solution Overview
Problem
Existing liquid detection indicators in electronic devices are commoditized and lack distinctiveness, making it difficult for manufacturers to determine if an electronic device has been exposed to water, which complicates warranty claims.
Innovation Solution
A liquid contact indicator with a layer structure that includes a porous region allowing liquid to pass through and an ink material that migrates to the surface upon exposure, becoming visible under ultraviolet light, enabling detection of liquid ingress while blending with internal components and preventing false triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional indicator is used to detect liquid exposure, then the indicator changes color to show water contact, but the indicator can be easily replaced by users or third parties, making it impossible for manufacturers to verify warranty claims
Solution Approach 1:
The patent introduces an intermediary mechanism (the indicator's interaction with device components) that connects the indicator to the device structure. When liquid contacts the indicator, it causes permanent structural changes in surrounding components (corrosion, discoloration, deformation) that serve as irreversible evidence of liquid exposure, preventing simple replacement while maintaining the indicator's detection function
Solution Approach 2:
The indicator is positioned and configured during device assembly to interact with specific internal components before any liquid exposure occurs. This preliminary positioning ensures that when liquid contact happens, it creates permanent changes in the device structure itself, establishing irreversible evidence that predates any potential indicator replacement
2Measurement precision
If an indicator is made visible to show liquid contact, then liquid exposure can be detected, but the indicator may cause false positives by reacting to substances other than water
Solution Approach 1:
The indicator and its surrounding components are selected with specific local properties that are sensitive to water but resistant to other substances. The indicator material, porous layer, and adjacent device components are chosen to create a localized chemical environment that responds specifically to water molecules, reducing false positives from other liquids while maintaining detection sensitivity
3Ease of manufacture
If the indicator uses a simple color change mechanism, then it is inexpensive and easy to manufacture, but it lacks distinctiveness and is essentially a commoditized product
Solution Approach 1:
The indicator system combines multiple materials with different functions: a porous hydrophilic material for liquid absorption, a fluorescent or phosphorescent material for enhanced visibility, and a protective coating for durability. This composite structure maintains manufacturing simplicity while creating a distinctive, multi-functional indicator that differs from conventional single-material indicators
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
The solution effectively detects liquid exposure in electronic devices, providing a visible indication under UV light while preventing false positives and allowing manufacturers to assess warranty claims accurately.
Implementation Method 1
a porous region that allows passage of the liquid from the first surface to the second surface
Implementation Method 2
when the liquid passes to the second surface, at least some of the ink material migrates via the porous regions to the first surface
Implementation Method 3
the ink material is rendered visible by ultraviolet light
Implementation Method 4
the ink material is rendered visible by ultraviolet light
Data Source
AI summary
An electronic device having an indication member for determining liquid exposure in an electronic device is disclosed. The indication member may include ink and a layer covering the ink. The layer may include a liquid-permeable layer that allows liquid to pass through the layer and contact the ink. In this regard, at least some of the ink may rise through the layer and to a top surface of the indication member. Although the ink may be exposed at the top surface, in some cases, the ink is visible or detectable when exposed to light from an ultraviolet light source. Also, the top surface may include a pattern or other indicia that is also visible or detectable when exposed to the light source. When the indication member is exposed to liquid, the pattern may be altered or disturbed in a location corresponding to an exposed portion of the indication member.