Flexible Display Window With SiO2-Al2O3 Layer For Low Reflectance
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Solution Overview
Problem
Flexible display devices with foldable or bendable windows are prone to damage from external impacts due to insufficient mechanical strength and high reflectance, which affects display efficiency and user convenience.
Innovation Solution
A window structure comprising a base layer with a first layer of low refractive index, a second layer of silicon dioxide and aluminum oxide in a 25:75 to 35:65 weight ratio, and a third layer of fluorine-containing polymer, optimized for mechanical strength and low reflectance, is used in conjunction with a display module to enhance durability and display efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flexible window is used in foldable or bendable display devices, then user convenience and portability are improved, but the window becomes easily damaged by external impact due to insufficient mechanical strength
Solution Approach 1:
The patent applies composite materials by creating a multi-layer window structure consisting of a base layer, a first layer (lower refractive index than base layer), a second layer (higher refractive index than first layer), and a third layer. This composite structure provides both flexibility for folding/bending operations and enhanced mechanical strength to resist external impacts, resolving the contradiction between user convenience and mechanical durability.
2Ease of manufacture
If conventional window materials are used, then manufacturing is simple, but reflectance is high which affects display efficiency
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive index parameters of each layer. The first layer has a lower refractive index than the base layer, the second layer has a higher refractive index than the first layer, and specific thickness ranges are maintained. These parameter optimizations reduce reflectance to improve display efficiency while keeping the manufacturing process compatible with existing technologies.
3Strength
If the second layer thickness is increased to improve mechanical strength, then durability increases, but reflectance increases reducing display efficiency
Solution Approach 1:
The patent applies local quality by assigning different functional characteristics to different layers. The second layer is specifically optimized with a thickness of 10-20 nm and a controlled refractive index (1.43-1.50 at 550 nm wavelength) to provide localized mechanical reinforcement without compromising optical performance. This localized optimization allows the layer to contribute to mechanical strength while maintaining low reflectance for high display efficiency.
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 window structure provides increased mechanical strength and reduced reflectance, enhancing the durability and display efficiency of flexible display devices while maintaining low reflectance, thus improving user convenience and device reliability.
Implementation Method 1
at a wavelength of about 550 nm, the second layer may have a refractive index in a range of about 1.43 to about 1.50
Implementation Method 2
A first layer is disposed on the base layer. A second layer is disposed on the first layer. A third layer is disposed on the second layer
Data Source
AI summary
A window includes a base layer. A first layer is disposed on the base layer. A second layer is disposed on the first layer. A third layer is disposed on the second layer. The second layer includes silicon dioxide (SiO2) and aluminum oxide (Al2O3). A weight ratio of the silicon dioxide to the aluminum oxide in the second layer is in a range of about 25:75 to about 35:65.