Porous Anti-Reflection Layer for Foldable Display Durability
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Solution Overview
Problem
Display apparatuses with anti-reflection layers are prone to damage when folded, compromising durability.
Innovation Solution
A display apparatus with a multi-layer anti-reflection layer comprising a first layer with holes or grooves and a second layer with a higher density, where the layers have different refractive indices, allowing the apparatus to be foldable without damaging the anti-reflection layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional anti-reflection layer is applied on the cover window, then the reflectivity of incident light is reduced, but the anti-reflection layer is damaged when the display apparatus is folded
Solution Approach 1:
The first layer is segmented into multiple regions by forming holes or grooves that extend from the first surface to the second surface. This segmentation divides the continuous layer into isolated sections, allowing the layer to flex and deform during folding without generating catastrophic stress concentration, thereby preventing layer damage while maintaining anti-reflection functionality.
Solution Approach 2:
The first layer is designed with a porous structure containing holes or grooves that pass through it. This porous configuration reduces the rigidity of the layer, enabling it to accommodate bending stresses during folding operations. The porous structure allows the layer to stretch and compress elastically, preventing crack formation and delamination while preserving the anti-reflection optical properties.
2Reliability
If the anti-reflection layer is made flexible to enable folding, then the durability is improved, but the anti-reflection properties may be compromised
Solution Approach 1:
The anti-reflection layer is constructed as a composite structure with two layers having different refractive indices. The first layer (with holes or grooves) provides flexibility and foldability, while the second layer (without holes) maintains the anti-reflection optical properties. This composite configuration allows each layer to perform its specialized function, ensuring both durability during folding and effective anti-reflection performance.
Solution Approach 2:
Different regions of the anti-reflection layer are assigned different structural qualities: the first layer has a porous, flexible structure to accommodate bending, while the second layer has a dense, continuous structure to optimize anti-reflection properties. This local differentiation of structural qualities allows the overall system to achieve both flexibility and optical performance without compromising either function.
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 multi-layer anti-reflection layer enhances the durability of the display apparatus, enabling it to be folded without compromising its anti-reflection properties.
Implementation Method 1
anti-reflection layer including a first layer disposed on the cover window and a second layer disposed on the first layer and having a refractive index less than a refractive index of the first layer
Implementation Method 2
first layer includes a plurality of holes passing through the first surface and the second surface
Data Source
AI summary
A display apparatus a display panel including a display element; a cover window on the display panel, and an anti-reflection layer on the cover window. The anti-reflection layer includes a first layer having a refractive index, a second layer on the first layer and having a refractive index less than the refractive index of the first layer, the first layer including a first surface facing the second layer and a second surface facing the cover window, and the first layer including a plurality of holes defined therein and open at both the first surface and the second surface.