Multilayer TPU Membrane for Liquid Lens Optical Clarity and Barrier
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Solution Overview
Problem
Current liquid lens technologies face challenges in achieving a transparent elastic membrane with reproducible elastic response under small strains over multiple cycles while providing effective barrier layer properties, as existing materials like aliphatic and aromatic thermoplastic polyurethanes (TPUs) either lack optical clarity or barrier performance.
Innovation Solution
The development of multilayer membranes comprising thermoplastic polyurethane (TPU)-based structures with specific layer configurations, such as bilayer and tri-layer architectures, incorporating optically transparent aliphatic and aromatic TPU layers with barrier layers like PVDF, which are co-extruded, stretched, and annealed to achieve the desired elastic response and barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If aliphatic TPU layers are used to achieve optical clarity, then transmissivity is improved, but barrier performance deteriorates
Solution Approach 1:
The patent employs composite multilayer membrane structures combining aliphatic TPU layers (for optical clarity) with aromatic TPU layers and PVDF barrier layers. This composite approach allows each layer to contribute its strengths: aliphatic TPU provides transparency, while aromatic TPU and PVDF provide barrier properties against fluid transpiration, achieving both optical clarity and effective barrier performance simultaneously
2Object-affected harmful factors
If aromatic TPU layers are used to improve barrier performance, then barrier properties are improved, but optical clarity deteriorates
Solution Approach 1:
The patent uses composite multilayer membranes where aromatic TPU layers are combined with optically clear aliphatic TPU layers and PVDF layers. The aromatic TPU provides the necessary barrier performance, while the aliphatic TPU and PVDF layers compensate for optical clarity losses, achieving both barrier protection and transparency in the overall membrane structure
3Device complexity
If single-layer membranes are used to simplify structure, then device complexity is reduced, but both optical clarity and barrier performance cannot be achieved simultaneously
Solution Approach 1:
The patent divides the membrane into multiple functional layers, each optimized for specific properties: aliphatic TPU layers for optical clarity, aromatic TPU layers for barrier performance, and PVDF layers for enhanced barrier properties. This segmentation allows each layer to specialize in one function, achieving superior overall performance compared to single-layer membranes while maintaining manageable structural complexity through systematic layer configuration
4Reliability
If multilayer membranes are used to achieve both optical clarity and barrier performance, then performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple polymer layers (aliphatic TPU, aromatic TPU, and PVDF) into an integrated multilayer membrane structure that can be manufactured as a unified component. This merging approach achieves both optical clarity and barrier performance in a single membrane assembly, simplifying the overall manufacturing process compared to assembling separate components, while maintaining the performance benefits of multilayer construction
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
These multilayer membranes exhibit high optical clarity, effective barrier performance, and a stable elastic response under small strains, enabling improved performance in liquid lens applications by maintaining transmissivity and limiting fluid transpiration, with the ability to withstand multiple actuation cycles.
Implementation Method 1
providing effective barrier layer properties
Implementation Method 2
exhibit a stable elastic response under small strains
Implementation Method 3
maintaining transmissivity
Data Source
AI summary
A liquid lens architecture includes a transparent substrate, a multilayer thermoplastic polyurethane (TPU)-based membrane overlying at least a portion of the transparent substrate, and a liquid layer disposed between and abutting the transparent substrate and the multilayer thermoplastic polyurethane-based membrane. The TPU-based membrane may exhibit a reversible elastic response to imposed strains of up to approximately 2% and is configured to limit the transpiration of fluid to less than approximately 10−2 g/m2/day.