Transparent Omniphobic Coating for Hard Yet Bendable Screens
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Solution Overview
Problem
Existing coatings for electronic device screens lack the combination of high hardness, flexibility, and omniphobic properties to effectively prevent fingerprints and smudging, while also being resistant to scratching and bending.
Innovation Solution
A bilayer bifunctional coating comprising ladder-like polysilsesquioxane (LASQ) with both liquid-like and crosslinkable moieties, allowing for a single-step deposition that forms a transparent, wear-resistant, and flexible anti-smudge layer with glass-like hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If organic polymer coatings are used for flexibility, then flexibility is improved, but hardness deteriorates (below 0.4 GPa)
Solution Approach 1:
The patent creates a composite coating system combining an organic polymer matrix with inorganic hard particles (such as silica, titania, or zirconia nanoparticles). This composite structure allows the organic phase to provide flexibility while the inorganic phase contributes hardness exceeding 1 GPa, resolving the contradiction between soft flexibility and hard wear resistance
Solution Approach 2:
The patent modifies the chemical composition and crosslinking density of the polymer matrix to achieve optimal balance. By adjusting parameters such as polymer molecular weight, crosslinking agent ratio, and curing conditions, the coating achieves enhanced hardness through chemical crosslinking while preserving the flexibility inherent in the polymer structure
2Length of moving object
If glass is made thin to be rollable, then flexibility is improved, but scratch resistance deteriorates (susceptible to scratching and defects)
Solution Approach 1:
The patent develops an ultra-thin coating layer (tens of nanometers to micrometers) that can be conformally deposited on flexible substrates. This thin film approach provides sufficient scratch protection without the brittleness of thick glass, enabling the coating to flex and roll with the device while maintaining wear resistance through high hardness materials
Solution Approach 2:
The coating uses composite materials combining flexible polymer binders with hard inorganic particles, creating a material that is both flexible enough for thin-film applications and hard enough to resist scratching, eliminating the need for thick rigid glass layers
3Length of moving object
If polyimide film is used as protective layer, then flexibility is improved, but wear resistance deteriorates
Solution Approach 1:
The patent transforms the soft polyimide film into a wear-resistant coating by incorporating high-hardness inorganic particles (such as silica, alumina, or titania nanoparticles) into the polymer matrix. The resulting composite coating maintains the flexibility of the polyimide substrate while achieving hardness greater than 1 GPa for superior wear and scratch resistance
Solution Approach 2:
The patent enhances the wear resistance of polyimide by modifying its chemical structure through crosslinking and by controlling the morphology and distribution of reinforcing particles. These parameter changes transform the inherently soft polymer into a durable, wear-resistant coating that retains flexibility
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 coating achieves high hardness (1.4 GPa), flexibility, and omniphobic properties, preventing smudging and resisting scratches and bending, with improved ice-shedding capabilities and antimicrobial properties.
Implementation Method 1
A method is provided for forming a crosslinked coating
Implementation Method 2
the coating is omniphobic... the coating has a surface energy of about 5 to about 40 mJ/m2
Data Source
AI summary
Transparent rollable omniphobic coatings are described that have exceptional hardness and wear resistance. The coatings have facile preparation. They are highly transparent and substrate can undergo inward bending on the inner side of a bend to radii <1 mm without cracking. The polymer can be deposited in a single step to yield a coating that serves the dual function of an anti-smudge layer and a bendable protective layer with glass-like hardness and polymer-like flexibility.