Flexible Display Layer Interlocking for Foldable Terminal Reliability
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Solution Overview
Problem
Flexible displays in foldable terminals face reliability issues due to detachment of layer structures after repeated folding, affecting their performance and longevity.
Innovation Solution
A flexible display design with a step structure formed by different layer configurations, including a substrate, data line layer, metal layer, encapsulation layer, and polarizer layer, where the fourth layer structure covers and extends beyond the first layer structure to enhance connection strength, and a pressure-sensitive adhesive layer is used to bond these layers securely, preventing warpage and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the flexible display is folded repeatedly, then the terminal volume is reduced, but the layer structures may detach
Solution Approach 1:
The patent introduces a stepped structure where the first layer structure extends beyond the second layer structure in the thickness dimension, creating multiple bonding interfaces. This dimensional change allows the layers to interlock more effectively, preventing detachment during repeated folding while maintaining the flexible display's compact form factor.
Solution Approach 2:
The flexible display is divided into distinct layer structures (first layer structure and second layer structure) with different extension ranges. This segmentation creates separate bonding zones that can independently withstand folding stresses, improving overall connection reliability while allowing the terminal to maintain its foldable design for volume reduction.
2Reliability
If the first layer structure and second layer structure are stably connected, then reliability is improved, but the structure becomes more complex
Solution Approach 1:
The patent applies different extension ranges to different layer structures locally. The first layer structure extends beyond the second layer structure only in specific regions where additional bonding is needed, rather than uniformly increasing complexity throughout the entire display structure. This localized approach improves reliability without proportionally increasing overall device 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 design ensures stable and reliable connections between layer structures, improving the durability and reliability of the flexible display even after multiple folds by distributing stress evenly and preventing detachment.
Implementation Method 1
a pressure-sensitive adhesive layer is used to bond these layers securely, preventing warpage and detachment
Data Source
AI summary
A flexible display includes: a first layer structure and a second layer structure, where the first layer structure includes a first structure located at a same layer as the second layer structure and a second structure stacked on the second layer structure; a third layer structure, where the third layer structure covers the second structure and a first part of the first structure; a fourth layer structure, where the fourth layer structure is disposed at a same layer as the third layer structure, and covers a second part of the first structure; and a fifth layer structure, where the fifth layer structure covers the third layer structure and the fourth layer structure, and is fixedly connected to the third layer structure and the fourth layer structure.