Flexible Display Support Layer Alloy Elastic Strain Yield Strength
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Solution Overview
Problem
Flexible display apparatuses face challenges in maintaining structural integrity and preventing deformation when folded, rolled, or bent due to insufficient elastic restoration force and strength, leading to potential damage and reduced user convenience.
Innovation Solution
A display apparatus with a support layer made of an alloy comprising elements like aluminum, zirconium, titanium, molybdenum, copper, nickel, yttrium, and silicon, having an elastic strain of 2.5% or greater and a yield strength of 1200 MPa or greater, which is formed using a high-frequency pulsed-DC magnetron sputtering process, providing improved elastic strain and yield strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flexible display apparatus is designed to be folded, rolled, or bent, then ease of operation and adaptability are improved, but structural integrity and reliability deteriorate due to insufficient elastic restoration force and strength
Solution Approach 1:
The patent changes the material parameters of the support layer by selecting specific alloys (such as Zr-Cu-Co, Zr-Cu-Si, Al-Y-Ni-Co, Ti-Si-Zr-Mo, Mo-Zr-Si-Ti) with controlled compositions and atomic percentages. These parameter changes result in a support layer with elastic strain of 2.5% or greater and yield strength of 1200 MPa or greater, enabling the flexible display apparatus to maintain structural integrity while being foldable, rollable, or bendable
Solution Approach 2:
The patent employs composite material strategy by using multi-element alloys in the support layer. The support layer is composed of combinations such as Zr-Cu-Co, Zr-Cu-Si, Al-Y-Ni-Co, Ti-Si-Zr-Mo, or Mo-Zr-Si-Ti, where multiple elements work together to achieve both high elastic strain and high yield strength. This composite approach allows the material to simultaneously provide flexibility for folding/rolling and strength for structural integrity
2Ease of manufacture
If the support layer uses conventional materials, then ease of manufacture is improved, but elastic strain and yield strength are insufficient to prevent deformation under repeated folding
Solution Approach 1:
The patent specifies precise material parameters including elastic strain of 2.5% or greater and yield strength of 1200 MPa or greater for the support layer. It defines specific alloy compositions with atomic percentage ranges (e.g., Zr: 50-90 at%, Al: 50-85 at%) to achieve these mechanical properties. The high-frequency pulsed-DC magnetron sputtering process parameters are also optimized to produce the desired microstructure and mechanical properties
Solution Approach 2:
The patent applies local quality by creating a support layer with specific regional characteristics - using ion-etching to prepare the surface and then depositing alloy materials with specific compositions (such as Zr-Cu-Co, Al-Y-Ni-Co, Ti-Si-Zr-Mo, Mo-Zr-Si-Ti) that provide enhanced elastic restoration force and strength at the critical support layer location, while other layers maintain their conventional structures
3Strength
If the support layer thickness is increased to improve strength, then yield strength is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent achieves the required yield strength of 1200 MPa or greater through changes in material composition and microstructure rather than simply increasing thickness. By selecting specific alloys (Zr-Cu-Co, Zr-Cu-Si, Al-Y-Ni-Co, Ti-Si-Zr-Mo, Mo-Zr-Si-Ti) and controlling their atomic percentages, the support layer attains high strength with maintained flexibility and without adding complex multi-layer structures
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 elastic strain and yield strength of the support layer significantly improve the display apparatus's ability to resist deformation and maintain reliability even under repetitive folding, rolling, or bending, ensuring durability and user convenience.
Implementation Method 1
forming a support layer including a metal on the ion-etched surface using a sputtering process
Implementation Method 2
ion-etching a surface of the processing substrate
Data Source
AI summary
A display apparatus includes a display panel including a base substrate, a circuit layer, and a light emitting element which are stacked on each other, and a support layer disposed below the base substrate and including a metal. The support layer has an elastic strain of about 2.5% or greater, and the support layer has a yield strength of about 1200 MPa or greater.