Cover Window Layer Design for Foldable Display Impact Resistance
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Solution Overview
Problem
Foldable display devices face increased risk of damage due to thin cover windows, which are prone to damage from external impacts, limiting their portability and functionality.
Innovation Solution
A cover window design with a folding portion and a non-folding portion, featuring distinct layers with varying metal ion concentrations and depletion regions, enhancing impact strength and flexibility by adjusting the thickness and modulus of the first layer, while maintaining toughness and preventing visual recognition of the folding mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cover window thickness is reduced to enable folding, then portability and flexibility are improved, but impact strength and damage resistance deteriorate
Solution Approach 1:
The patent applies local quality by creating distinct layers within the cover window with different metal ion concentrations. The first layer (outer surface) has lower metal ion concentration to provide flexibility and elongation for folding, while the second layer (inner surface) has higher metal ion concentration to provide strength and resistance against impact damage. This spatial differentiation of material properties resolves the contradiction between folding capability and impact strength.
Solution Approach 2:
The patent employs composite materials by forming a multi-layered glass structure with varying compositions. The cover window consists of multiple layers with different metal ion concentrations (Na+, K+), creating a composite material system where each layer contributes different mechanical properties. The outer layer provides flexibility while the inner layer provides strength, collectively solving the contradiction between portability and durability.
2Ease of operation
If the cover window thickness is reduced for portability, then ease of portability is improved, but reliability against damage deteriorates
Solution Approach 1:
The patent applies local quality by creating distinct layers within the cover window with different metal ion concentrations. The first layer (outer surface) has lower metal ion concentration to provide flexibility and elongation for folding, while the second layer (inner surface) has higher metal ion concentration to provide strength and resistance against impact damage. This spatial differentiation of material properties resolves the contradiction between folding capability and impact strength.
Solution Approach 2:
The patent employs composite materials by forming a multi-layered glass structure with varying compositions. The cover window consists of multiple layers with different metal ion concentrations (Na+, K+), creating a composite material system where each layer contributes different mechanical properties. The outer layer provides flexibility while the inner layer provides strength, collectively solving the contradiction between portability and durability.
3Stability of the object's composition
If the first layer modulus is reduced to improve elongation, then flexibility is improved, but structural stability may deteriorate
Solution Approach 1:
The patent applies local quality by creating distinct layers within the cover window with different metal ion concentrations. The first layer (outer surface) has lower metal ion concentration to provide flexibility and elongation for folding, while the second layer (inner surface) has higher metal ion concentration to provide strength and resistance against impact damage. This spatial differentiation of material properties resolves the contradiction between folding capability and impact strength.
Solution Approach 2:
The patent employs composite materials by forming a multi-layered glass structure with varying compositions. The cover window consists of multiple layers with different metal ion concentrations (Na+, K+), creating a composite material system where each layer contributes different mechanical properties. The outer layer provides flexibility while the inner layer provides strength, collectively solving the contradiction between portability and durability.
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 enhanced cover window design increases the degree of freedom in thickness, improving elongation and impact strength, allowing for more robust and flexible foldable display devices without compromising aesthetics or functionality.
Implementation Method 1
a concentration of the metal ion included in the second layer is higher than a concentration of the metal ion included in the first layer
Implementation Method 2
the first layer includes a plurality of depletion regions
Implementation Method 3
the folding portion includes an inside surface that is compressed when folded and an outside surface that is stretched when folded
Data Source
AI summary
A cover window, a manufacturing method of a cover window, and a display device including a cover window are provided. A cover window includes a folding portion and a non-folding portion, and the folding portion includes an inside surface that is compressed when folded and an outside surface that is stretched when folded, the folding portion includes a first layer adjacent to the outside surface, a second layer adjacent to the inside surface, and a third layer between the first layer and the second layer, the folding portion and the non-folding portion include at least one metal ion, a concentration of the metal ion included in the second layer is higher than a concentration of the metal ion included in the first layer, and the first layer includes a plurality of depletion regions.