Stacked Layer Structure for Local Bending Peel Resistance
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Solution Overview
Problem
Flexible display devices face issues with peeling between layers when subjected to repeated local bending, despite passing conventional U-shaped bending tests, as stress concentrates at local bent portions.
Innovation Solution
A stacked body design with a second layer having a recovery at its cross-section of 10% or more, measured by nanoindentation, to prevent peeling between layers during local bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional U-shaped bending test is used to evaluate bending resistance, then the stacked body passes the test with good bending resistance, but peeling between layers occurs when local bending is applied repeatedly
Solution Approach 1:
The patent applies local quality by specifying that the second layer must have a recovery of 10% or more at its cross-section, creating a localized property requirement that directly addresses the peeling issue at bent portions while allowing other parts of the stacked body to maintain their original characteristics
Solution Approach 2:
The patent changes the parameter of recovery (elasticity) of the second layer to 10% or more, which fundamentally alters the mechanical behavior of the adhesive layer to prevent peeling under local bending conditions that conventional tests fail to detect
2Adaptability or versatility
If the stacked body is designed for flexibility, then it can be bent for foldable displays, but stress concentrates at local bent portions causing peeling
Solution Approach 1:
The patent applies local quality by specifying that the second layer must have a recovery of 10% or more at its cross-section, creating a localized property requirement that directly addresses the peeling issue at bent portions while allowing other parts of the stacked body to maintain their original characteristics
Solution Approach 2:
The patent uses composite materials by combining multiple layers with different properties (first layer, second layer with high recovery, third layer) to achieve both flexibility and peeling resistance, where the composite structure compensates for the weaknesses of individual layers
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 design provides enhanced bending resistance by minimizing peeling between layers, even under localized stress, ensuring durability in flexible displays.
Implementation Method 1
a recovery at a cross-section of the second layer, according to a nanoindentation method, is 10% or more
Data Source
AI summary
The present disclosure provides a stacked body comprising a first layer, a second layer, and a third layer in this order, wherein a recovery at a cross-section of the second layer, according to a nanoindentation method, is 10% or more.