Multilayer Fluorinated Membrane for Electrowetting Water Repellency
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Solution Overview
Problem
Current electrowetting devices face challenges in achieving high response speed and long-term durability due to inadequate water repellency and membrane strength, particularly when exposed to water, with existing materials like Cytop and Teflon AF falling short in maintaining water repellency over time.
Innovation Solution
A multilayer membrane structure is employed, comprising a layer of fluorinated polymer (A) with a fluorinated aliphatic ring structure having one etheric oxygen atom and a layer (B) with two or three etheric oxygen atoms, where layer (B) is the outermost layer, enhancing water repellency and membrane strength while preventing deterioration in warm water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a membrane made of Cytop is used, then transparency and insulating properties are improved, but water repellency is insufficient
Solution Approach 1:
The patent uses a composite membrane structure consisting of a base layer (Cytop or similar transparent fluorinated polymer) and a surface layer (Teflon AF or similar high water repellency material). This composite structure combines the transparency advantage of Cytop with the water repellency advantage of Teflon AF, resolving the contradiction between these two properties.
2Reliability
If a membrane made of Teflon AF is used, then water repellency is improved, but membrane strength decreases and cracks form
Solution Approach 1:
The patent creates a composite membrane where Teflon AF forms the surface layer providing high water repellency, while a base layer of more mechanically robust material provides structural support. This prevents cracks and peeling while maintaining excellent water repellency.
Solution Approach 2:
The membrane is divided into functional layers: a base layer for mechanical strength and a surface layer for water repellency. This segmentation allows each layer to optimize its specific function without compromising the other.
3Speed
If high water repellency is achieved through conventional materials, then response speed is improved, but durability in warm water deteriorates
Solution Approach 1:
The patent employs a composite membrane structure where the surface layer material (Teflon AF or similar) is specifically selected for its thermal stability and resistance to water-induced deterioration. This composite structure maintains high water repellency and fast response speed while resisting degradation in warm water environments.
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 proposed solution results in an electrowetting device with excellent water repellency, membrane strength, and durability, ensuring the device maintains performance even after exposure to warm water, with dynamic sweepback angles exceeding 110° and no significant decrease in water repellency over time.
Implementation Method 1
a method of utilizing electrowetting (interfacial electrical phenomenon) is known
Implementation Method 2
a membrane having water repellency (hydrophobicity)
Data Source
Figure 1~2
AI summary
To provide an electrowetting device provided with a membrane excellent in water repellency, membrane strength and durability, and a display device and a lens, provided therewith. An electrowetting device comprising a space to contain fluids, two types of fluids that form an interface in the space, a membrane that is in contact with the space, a first electrode disposed on the opposite side of the membrane from the side in contact with the space, and a second electrode that is in contact with one of the two types of fluids, wherein said membrane is a multilayer membrane which comprises a layer (A) made of a fluorinated polymer (A) that includes, as the main component, a constituting unit including a fluorinated aliphatic ring structure having one etheric oxygen atom in the ring structure, and a layer (B) made of a fluorinated polymer (B) that includes, as the main component, a constituting unit including a fluorinated aliphatic ring structure having two or three etheric oxygen atoms in the ring structure, and said layer (B) is disposed as the outermost layer on the side in contact with the space.