Laminated Polyester Film Antireflection Interference Reduction
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Solution Overview
Problem
Conventional antireflection films for flat panel displays suffer from interference patterns due to insufficient adhesion and refractive index differences between layers, leading to visibility issues, and existing solutions like copolymerizing monomers with aromatic substituents or using metal oxide particles face challenges such as poor adhesion and haze formation under high temperature and humidity conditions.
Innovation Solution
A laminated polyester film with a layer of polyester resin containing a fluorene backbone, a cross-linking agent, and controlled refractive index, which is coated with a high refractive index hard coat layer and a low refractive index layer to reduce interference patterns and enhance adhesion, particularly under high temperature and humidity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a high refractive index resin is used to reduce interference patterns, then the refractive index difference between layers is reduced, but the resin becomes rigid and cannot be stretched smoothly, causing fine cracks and poor spreadability in in-line coating process
Solution Approach 1:
The patent changes the chemical composition parameters of the resin by copolymerizing fluorene groups with polyester chains, creating a resin that maintains high refractive index while improving flexibility and stretchability, thus resolving the contradiction between optical performance and processability
Solution Approach 2:
The patent creates a composite resin system combining fluorene groups with polyester chains, where the fluorene provides high refractive index and the polyester chain provides flexibility and stretchability, achieving both optical performance and ease of manufacture
2Manufacturing precision
If monomers with aromatic substituent groups are copolymerized to increase refractive index, then interference patterns are reduced, but the resin requires large amounts of hydrophilic sulfonate groups to disperse water, leading to poor adhesion under high temperature and high humidity conditions
Solution Approach 1:
The patent modifies the resin composition by controlling the amount of hydrophilic sulfonate groups and using fluorene groups with appropriate molecular weight and structure, achieving high refractive index while maintaining adhesion performance under harsh conditions
Solution Approach 2:
The patent creates local heterogeneity in the resin structure by incorporating fluorene groups at specific positions within the polymer chain, providing high refractive index where needed while maintaining overall flexibility and adhesion properties
3Strength
If an adhesion layer is formed to improve adhesive property, then adhesion to hard coat layer is improved, but the refractive index difference between adhesion layer and hard coat layer increases, leaving interference pattern elimination difficult
Solution Approach 1:
The patent creates a resin that performs multiple functions simultaneously: providing adhesion to the hard coat layer, reducing refractive index difference to eliminate interference patterns, and maintaining flexibility for easy coating process, thus resolving the contradiction between adhesion and optical performance
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 solution effectively reduces interference patterns and maintains good adhesion to the hard coat layer, providing a high-quality antireflection film with improved optical and mechanical properties.
Implementation Method 1
a laminated polyester film that effectively depresses the formation of interference patterns when used as base for an antireflection film
Implementation Method 2
interference patterns caused by insufficient adhesion, difference in refractive index between the film and the hard coat layer
Implementation Method 3
a layer (layer C) containing a polyester resin (A) having a fluorene backbone
Data Source
AI summary
A laminated polyester film includes a layer (S) of polyester and a layer (C) including a polyester resin (A) having a fluorene backbone, wherein a surface of the layer (C) has an adhesive index after a heat and wet test of 3 to 5.