Rollable Display Structure with Selective Support to Reduce Folding Stress
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Solution Overview
Problem
Current rollable display devices face issues with stress-induced damage during folding or expansion, which reduces their lifespan and flexibility.
Innovation Solution
A rollable display device design featuring a substrate with distinct bending, rollable, and non-rollable portions, where the bending portion is not attached by a supporting layer, and the rollable portion is supported by a supporting layer, enhancing flexibility and reducing stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the supporting layer is attached to the entire substrate, then the structural strength is improved, but the flexibility during folding is reduced and stress damage increases
Solution Approach 1:
The substrate is divided into distinct functional regions: a bending portion without supporting layer attachment that allows flexible folding, and a rollable portion with supporting layer attachment that provides structural strength. This segmentation enables different mechanical properties in different areas, resolving the contradiction between overall strength and localized flexibility.
Solution Approach 2:
The supporting layer is selectively attached only to the rollable portion of the substrate, leaving the bending portion unattached. This creates local quality differences where the rollable portion has high structural strength while the bending portion maintains high flexibility, allowing the device to fold without damage while preserving necessary structural support.
2Stability of the object's composition
If the supporting layer is attached to the bending portion, then the structural stability is improved, but the stress during folding increases and causes damage
Solution Approach 1:
The substrate is segmented into a bending portion and a rollable portion, with the supporting layer attached only to the rollable portion. This segmentation isolates the bending portion from the supporting layer, allowing it to flex freely during folding without generating damaging stress, while the rollable portion maintains structural stability through supporting layer attachment.
Solution Approach 2:
The supporting layer is selectively applied to create local quality differences: the rollable portion has high structural stability due to supporting layer attachment, while the bending portion has low structural constraint to minimize folding stress. This local differentiation resolves the contradiction between overall stability and stress reduction during bending operations.
Data Source
AI summary
A rollable display device is provided by the present disclosure. The rollable display device includes a substrate, a display element, a circuit element and a supporting layer. The substrate has a bending portion and a rollable portion. The display element is disposed on the rollable portion. The circuit element is disposed on the bending portion and electrically connected to the display element. The supporting layer is disposed under the substrate, wherein the rollable portion is attached by the supporting layer, and at least a part of the bending portion is not attached by the supporting layer.