Anti-Fingerprint Coating Composition for Flexible Displays

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Solution Overview

Problem

Flexible display devices require a window film with excellent weather resistance, scratch resistance, and impact resistance, but existing coatings lack sufficient anti-fingerprint characteristics and wear resistance, leading to peeling issues.

Innovation Solution

A coating composition comprising compounds with different molecular weights of a perfluoropolyether group, combined in specific weight ratios, is applied to form an anti-fingerprint layer that enhances wear resistance and adhesion to a hard coating layer, improving the anti-fingerprint characteristics and chemical resistance of the display device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional coating is applied to provide basic protection, then weather resistance and impact resistance are improved, but anti-fingerprint characteristics and wear resistance are insufficient

Engineering Contradiction:

Improveanti-fingerprint characteristicsVSAvoidfingerprint adhesion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the coating by incorporating fluorinated compounds with specific molecular structures (CF3 groups and perfluoropolyether chains). This chemical parameter modification creates low surface energy and low friction characteristics that directly improve anti-fingerprint properties while maintaining weather resistance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite coating formulation combining multiple fluorinated compounds with different molecular weights and functional groups. This composite approach integrates the protective properties of fluorinated materials with the mechanical properties of the base coating, achieving both weather resistance and superior anti-fingerprint characteristics.

Inventive Principle:

Principle #40Composite materials

2Strength

If a hard coating layer is applied to provide scratch resistance, then mechanical strength is improved, but adhesion between coating layers deteriorates

Engineering Contradiction:

Improvescratch resistanceVSAvoidcoating layer adhesion

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies different functional characteristics to different parts of the coating system. The fluorinated compounds are strategically positioned at the interface between coating layers to provide localized adhesion enhancement through chemical bonding, while the outer surface maintains hard coating properties for scratch resistance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The fluorinated compounds act as intermediary substances between the hard coating layer and the substrate or other coating layers. These compounds form chemical bonds with both the underlying layer and the overlying layer, serving as a bonding mediator that prevents peeling while maintaining the hardness of the protective layer.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 composition significantly improves wear resistance and anti-fingerprint characteristics, reducing peeling of the coating layer and enhancing the reliability of flexible display devices by maximizing fluorine density and chemical bonding between layers.

Implementation Method 1

The coating composition includes a compound having Formula 1... improving the anti-fingerprint characteristics and chemical resistance... maximizing fluorine density and chemical bonding between layers

Methodology Applied

Scientific EffectChemical bonding: Chemical Bonding