Flexible Window Layer Stack for Low-Reflectance Display Durability
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Solution Overview
Problem
Flexible display devices are prone to deformation and damage due to folding or bending, and their windows are susceptible to external impacts, leading to potential damage and reduced display efficiency.
Innovation Solution
A window structure comprising layers of magnesium oxide, magnesium fluoride, yttrium oxyfluoride, silicon oxide, aluminum oxide, and a fluorine-containing polymer, with specific refractive indices and thicknesses, to enhance durability and reduce reflectance, along with a light blocking layer and anti-reflective features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the window is made thinner to improve flexibility, then the flexibility and portability are improved, but the mechanical strength and durability are reduced
Solution Approach 1:
The window employs a composite structure consisting of a base layer and multiple functional layers (first layer, second layer, third layer, and fourth layer) made from different materials. Each layer serves specific purposes: the base layer provides structural support, while the functional layers enhance durability, reduce reflectance, and improve flexibility. This composite approach allows the window to achieve both flexibility and mechanical strength simultaneously.
Solution Approach 2:
The window is divided into multiple distinct layers, each with specific thicknesses and material compositions. The base layer is separated from the functional layers, which are further segmented into four distinct layers. This segmentation allows each layer to be optimized for its specific function, enabling the overall structure to be both flexible and mechanically strong.
2Strength
If the window layers are made thicker to improve durability, then the mechanical strength is improved, but the reflectance increases and display efficiency decreases
Solution Approach 1:
The patent optimizes the thickness parameters of each layer to achieve the desired balance between durability and reflectance. The first layer is configured with a thickness of 65-85 nm, the second layer with 65-85 nm, the third layer with 5-30 nm, and the fourth layer with 5-40 nm. These specific parameter ranges are determined to provide adequate mechanical strength while maintaining low reflectance characteristics.
Solution Approach 2:
Different layers of the window are assigned different material compositions and thicknesses to achieve local optimization. The first and second layers use materials with specific refractive indices (1.38-1.42) to reduce reflectance, while the third and fourth layers use different materials (refractive indices 1.46-1.50 and 1.30-1.35 respectively) to further optimize both durability and optical properties. This local quality differentiation allows each region of the window to perform its specific function effectively.
3Productivity
If multiple layers are added to reduce reflectance, then the display efficiency is improved, but the device complexity increases
Solution Approach 1:
Each layer of the window serves multiple functions simultaneously. For example, the first layer not only reduces reflectance through its optical properties but also contributes to the mechanical strength and flexibility of the overall structure. The second layer similarly provides both optical and mechanical functions. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The window uses composite material structures where each layer is designed with specific material properties to achieve multiple objectives. The combination of different materials in the four layers creates a composite structure that simultaneously addresses reflectance reduction, mechanical strength, flexibility, and durability requirements, thereby improving display efficiency without proportionally increasing complexity.
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 improves durability and maintains low reflectance, enhancing the display efficiency and mechanical characteristics of flexible display devices.
Implementation Method 1
a refractive index of each of the first layer and the second layer at a wavelength of about 550 nm may be about 1.38 to about 1.42, a refractive index of the third layer at the wavelength of about 550 nm may be about 1.46 to about 1.50, and a refractive index of the fourth layer at the wavelength of about 550 nm may be about 1.30 to about 1.35
Data Source
AI summary
A window according to one or more embodiments of the disclosure includes a base layer, a first layer on the base layer, a second layer below the base layer, a third layer on the first layer, and a fourth layer on the third layer, each of the first layer and the second layer including a magnesium oxide (e.g., MgO), a magnesium fluoride (e.g., MgF2), and an yttrium oxyfluoride (e.g., YOF). In addition, a display device and an electronic device including the window are also provided.