Foldable Display Backplate with Gradient Thickness Layers
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Solution Overview
Problem
Foldable display devices with different materials for folding and unfolding regions suffer from low impact resistance and visible physical border lines, leading to deteriorated display quality due to step differences and pressing property variations.
Innovation Solution
A backplate with a sandwich structure, featuring first and second soft material layers and a hard material layer between them, where the thickness of the soft material layers gradually reduces from the folding region to the unfolding region, eliminating the recognition of physical border lines and enhancing impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the backplate uses different materials (soft material for folding region, hard material for unfolding region), then the impact resistance of the unfolding region is improved, but a physical border line becomes recognized between the folding region and unfolding region due to step difference or difference in pressing property
Solution Approach 1:
The backplate is designed with different material properties in different regions: the folding region uses a soft material layer that allows bending and absorption of impact forces, while the unfolding region uses a hard material layer that provides structural support and high impact resistance. This local differentiation of material properties enables each region to perform its specific function optimally without creating visible border lines, as the transition is achieved through gradual thickness variation rather than abrupt material changes.
Solution Approach 2:
The backplate employs a composite structure consisting of multiple layers with different material properties. The soft material layer and hard material layer are combined in a single backplate component, allowing the folding region to be flexible and impact-absorbent while the unfolding region remains rigid and protective. This composite approach resolves the contradiction by integrating both soft and hard material characteristics into one unified structure that eliminates visible borders while maintaining both flexibility and impact resistance.
2Strength
If the backplate uses a single hard material for the entire surface, then the impact resistance is improved, but the folding region cannot be properly formed due to lack of flexibility
Solution Approach 1:
The backplate is designed with different material properties in different regions: the folding region uses a soft material layer that allows bending and absorption of impact forces, while the unfolding region uses a hard material layer that provides structural support and high impact resistance. This local differentiation of material properties enables each region to perform its specific function optimally without creating visible border lines, as the transition is achieved through gradual thickness variation rather than abrupt material changes.
Solution Approach 2:
The backplate employs a composite structure consisting of multiple layers with different material properties. The soft material layer and hard material layer are combined in a single backplate component, allowing the folding region to be flexible and impact-absorbent while the unfolding region remains rigid and protective. This composite approach resolves the contradiction by integrating both soft and hard material characteristics into one unified structure that eliminates visible borders while maintaining both flexibility and impact resistance.
Data Source
AI summary
A backplate having a folding region and an unfolding region adjacent to the folding region includes: first and second material layers corresponding to the folding and unfolding regions; and a third material layer between the first and second material layers, the third material layer is more rigid than the first and second materials layers, wherein the first and second material layers extend from the folding region to the unfolding regions such that a thickness of the first and second material layers is gradually reduced from the folding region to the unfolding region.