Flexible Display Window Stack for Low Reflectance and Strength
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Solution Overview
Problem
Existing flexible display devices face challenges in achieving low reflectance and maintaining mechanical strength, which affect display efficiency and durability.
Innovation Solution
A window structure comprising alternately stacked nitride and oxide layers, with specific thicknesses and refractive indices, is integrated into the display device to reduce reflectance and enhance mechanical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a window structure is designed to reduce reflectance, then display efficiency is improved, but mechanical strength may deteriorate
Solution Approach 1:
The window employs a composite structure consisting of multiple layers including inorganic layers (such as SiO2, Si3N4, TiO2) and organic layers (such as polyimide, acrylic resin). This composite material approach allows the window to achieve low reflectance through optimized layer combinations while maintaining mechanical strength through the inherent properties of the constituent materials and their interfacial bonding.
Solution Approach 2:
The window is divided into multiple discrete layers with specific thicknesses (e.g., first inorganic layer 50-200nm, second inorganic layer 200-500nm, organic layer 100-300nm). This segmentation allows independent optimization of each layer's properties to simultaneously achieve low reflectance and high mechanical strength, resolving the contradiction between optical performance and structural integrity.
2Productivity
If the window structure becomes more complex to achieve low reflectance, then display efficiency is improved, but device complexity increases
Solution Approach 1:
The window structure serves multiple functions simultaneously: the inorganic layers provide both optical interference for low reflectance and mechanical reinforcement, while the organic layers provide both adhesion between inorganic layers and flexibility for foldable displays. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving display efficiency improvements.
Solution Approach 2:
The patent optimizes specific parameters such as layer thicknesses (e.g., first inorganic layer 50-200nm, second inorganic layer 200-500nm) and refractive indices to achieve low reflectance. By carefully controlling these parameters within specific ranges, the patent achieves optimal optical performance without requiring excessive structural complexity, as the same parameter adjustments also influence mechanical properties.
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 results in reduced reflectance and increased mechanical strength, enhancing display efficiency and durability of flexible display devices.
Implementation Method 1
a plurality of nitride layers disposed on the base layer, a plurality of oxide layers disposed on the base layer... The nitride layers are alternately stacked with the oxide layers on the base layer... the nitride layers have a refractive index greater than a refractive index of the oxide layers
Data Source
AI summary
A window includes a base layer, a plurality of nitride layers disposed on the base layer, a plurality of oxide layers disposed on the base layer, and a protective layer disposed on the nitride layers and the oxide layers. The nitride layers are alternately stacked with the oxide layers on the base layer, and a sum of thicknesses of the nitride layers and thicknesses of the oxide layers is equal to or greater than about 500 nm and equal to or smaller than about 900 nm.