Internal Moisture-Resistant Coatings for Electronic Devices
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Solution Overview
Problem
Electronic devices face damage from moisture exposure, leading to electrical shorting and corrosion, which existing protective coatings fail to adequately prevent, especially in internal components and conductive features.
Innovation Solution
The application of internally confined moisture-resistant coatings, which can be conformal and impermeable, covering electrically conductive features and components within electronic devices to prevent moisture penetration and corrosion, using materials like poly(p-xylylene) and fluorinated polymers with nanostructures for enhanced water repellency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing protective coatings are applied to electronic components, then some protection against moisture is provided, but the coatings fail to adequately prevent moisture penetration and corrosion in internal components
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional coating materials to poly(p-xylylene) (Parylene) materials with superior moisture barrier properties. The coating thickness is also increased from typical thin coatings to ranges of 0.5-2 mils (12.7-50.8 micrometers), fundamentally changing the protective parameters to achieve adequate moisture penetration resistance for internal components
Solution Approach 2:
The patent employs composite material strategies by using multi-layer Parylene coating systems (Parylene C, Parylene N, Parylene D) with different properties. These composite coating systems provide enhanced moisture barrier protection compared to single-material coatings, addressing the insufficiency of existing protective coatings
2Reliability
If conformal coatings are applied to cover all surfaces, then moisture resistance is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent leverages the self-service property of Parylene coatings through their ability to conform automatically to complex three-dimensional surfaces during vapor deposition. The coating material deposits uniformly across all surfaces including recesses and irregular geometries without requiring manual intervention or complex application equipment, thus maintaining simplicity despite comprehensive coverage
Solution Approach 2:
The patent replaces complex mechanical coating application systems (spray booths, dip tanks, brush applications) with vapor deposition technology. This substitution eliminates the need for complex positioning and application mechanisms while achieving uniform conformal coverage of all internal surfaces, reducing overall device and process complexity
3Reliability
If thicker coatings are applied to ensure impermeability, then moisture protection is enhanced, but manufacturing precision and assembly difficulty increase
Solution Approach 1:
The patent replaces mechanical coating thickness control methods with vapor deposition processes that provide inherent precision through controlled deposition rates and timing. The atomic-layer-by-layer deposition mechanism ensures uniform thickness (0.5-2 mils) across complex geometries without requiring complex feedback control systems, maintaining manufacturing precision while achieving impermeable protection
Solution Approach 2:
The patent changes the coating thickness parameter from typical thin coatings (micrometers) to thicker coatings (0.5-2 mils or 12.7-50.8 micrometers). This parameter change ensures impermeability to moisture while the vapor deposition process maintains precision through its inherent control mechanisms, avoiding the assembly difficulties associated with overly thick or uneven coatings
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 limits moisture exposure to internal components, reducing the likelihood of electrical shorting and corrosion, thereby enhancing the reliability and longevity of electronic devices in humid environments.
Implementation Method 1
A moisture-resistant coating may be impermeable to, substantially impermeable to or repel water, an aqueous solution
Implementation Method 2
fluorinated polymers with nanostructures for enhanced water repellency
Data Source
AI summary
A moisture-resistant electronic device includes at least one electronic component at least partially covered by a moisture-resistant coating. The moisture-resistant coating may be located within an interior of the electronic device. The moisture-resistant coating may cover only portions of a boundary of an internal space within the electronic device. A moisture-resistant coating may include one or more discernible boundaries, or seams, which may be located at or adjacent to locations where two or more components of the electronic device interface with each other. Assembly methods are also disclosed.