Parylene Capping Layer for Leak-Safe Embedded Liquid Packaging

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Solution Overview

Problem

There are no standard packaging methods for MEMS devices with embedded liquids, leading to high costs and challenges such as leakage and performance alteration due to thick layers, which limits applications like biomedical sensors and energy harvesters.

Innovation Solution

A conformal parylene coating is used to cap or encapsulate liquids in MEMS devices, validated through systematic testing for reliability, including elevated temperature and mechanical testing, demonstrating superior mean-time-to-failure compared to other methods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional packaging methods are used for MEMS devices with embedded liquids, then device packaging can be achieved, but leakage occurs and device performance is altered due to thick layers

Engineering Contradiction:

Improveprevention of liquid leakageVSAvoidpackaging method complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs a thin-film parylene coating applied via chemical vapor deposition to encapsulate embedded liquids in MEMS devices. This thin film approach replaces conventional thick packaging layers, preventing liquid leakage while maintaining device performance and reducing structural complexity.

Inventive Principle:

Principle #30Flexible shells and thin films

2Reliability

If thick packaging layers are used to encapsulate embedded liquids, then liquid containment is achieved, but device performance is altered

Engineering Contradiction:

Improveliquid containmentVSAvoiddevice performance maintenance

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent uses a thin-film parylene coating that provides effective liquid containment without the thickness that would alter device performance. The chemical vapor deposition process ensures uniform, precise thin-film formation that maintains manufacturing precision while achieving reliable encapsulation.

Inventive Principle:

Principle #30Flexible shells and thin films

3Adaptability or versatility

If no standard packaging methods are used for embedded liquids, then customization is possible, but manufacturing cost increases significantly

Engineering Contradiction:

Improvecustomization capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent establishes a universal packaging approach using parylene chemical vapor deposition that can be applied to various MEMS device configurations with embedded liquids. This standardized method provides customization capability while reducing manufacturing cost through repeatable, scalable process implementation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Parylene capping effectively prevents liquid leakage and maintains device performance under various conditions, offering a reliable packaging solution for embedded liquids in MEMS devices.

Implementation Method 1

a conformal parylene capping layer on and contacting the liquid in the cavity, preventing the liquid from leaking out of the cavity

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Implementation Method 2

conformally forming a parylene capping layer on and contacting the liquid

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Data Source

PatentUS20250388351A1Parylene capping layer for embedded liquid packaging

Publication Date: 2025.12.25 UNM RAINFOREST INNOVATIONS

AI summary

A variety of applications can include parylene capping layer for embedded liquid packaging. A capping structure for liquid packaging can include a conformal parylene capping layer on and contacting a liquid in a recessed cavity of a substrate such that the parylene prevents the liquid from leaking out of the cavity, embedding the liquid in the cavity of the substrate. The selections of substrate, liquid, or type of parylene can be based on the application for which the liquid packaging is implemented.