Multilayer Antireflection Film for IR Transmittance and Flexibility
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Solution Overview
Problem
Existing antireflection films struggle to achieve both high infrared transmittance and reduced thickness while maintaining flexibility, especially for applications like foldable organic EL displays.
Innovation Solution
The antireflection film is designed with a specific multilayer structure comprising a hard coat layer, adhesion layer, and antireflection layer, including multiple high and low refractive index layers, which are formed using sputtering techniques, to achieve high infrared transmittance and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the antireflection film is reduced, then flexibility is improved, but infrared transmittance deteriorates
Solution Approach 1:
The antireflection film is divided into multiple alternating layers of high refractive index and low refractive index materials. This segmentation allows each layer to contribute differently to the overall optical performance, achieving high infrared transmittance through constructive interference while maintaining thin total thickness for flexibility.
Solution Approach 2:
The patent optimizes the optical thickness of each layer by adjusting the refractive index and physical thickness parameters. By carefully controlling these parameters, the film achieves maximum infrared transmittance at the desired wavelength while keeping the total film thickness minimal for flexibility requirements.
2Reliability
If the number of antireflection layers is increased, then infrared transmittance is improved, but device complexity increases
Solution Approach 1:
The patent extracts and emphasizes the essential function of alternating high and low refractive index layers, removing unnecessary complex structures. By focusing on the core mechanism of refractive index contrast, the design achieves high infrared transmittance with a manageable number of layers rather than overly complex multilayer systems.
Solution Approach 2:
The patent uses a moderate number of alternating layers (not the minimum possible nor excessive numbers), providing just enough optical control to achieve high infrared transmittance while avoiding the complexity and manufacturing difficulty associated with larger numbers of layers.
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 film achieves high infrared transmittance of 90% or more and reflectance of 5% or less at 940 nm, with excellent flexibility suitable for foldable displays, maintaining a neutral color tone of reflected light.
Implementation Method 1
the antireflection layer includes: a first high refractive index layer having an optical thickness of 41 to 52 nm, a first low refractive index layer having an optical thickness of 41 to 53 nm, a second high refractive index layer having an optical thickness of 302 to 313 nm, and a second low refractive index layer having an optical thickness of 135 to 196 nm
Implementation Method 2
which are formed using sputtering techniques
Data Source
AI summary
An antireflection film has high infrared transmittance and excellent flexibility. An antireflection layer includes a base material, a hard coat layer, an adhesion layer, and an antireflection layer in this order, wherein the antireflection layer includes, from the adhesion layer side, a first high refractive index layer having an optical thickness of 41 to 52 nm, a first low refractive index layer having an optical thickness of 41 to 53 nm, a second high refractive index layer having an optical thickness of 302 to 313 nm, and a second low refractive index layer having an optical thickness of 135 to 196 nm.