Rollable Device Insulating Layer Trench Stress Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rollable electronic devices face a high probability of cracks or damage during extension due to stress mismatch and structural weaknesses, particularly when the trenches are not aligned properly with the rolling axis.
Innovation Solution
The rollable electronic device incorporates a base layer, insulating layer with strategically placed trenches parallel to the rolling axis, and electronic units positioned between these trenches, ensuring that adjacent trenches overlap, reducing stress concentrations and enhancing structural tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional continuous insulating layer structure is used, then manufacturing is simpler, but stress concentration occurs during extension causing cracks and damage
Solution Approach 1:
The insulating layer is divided into multiple segments by introducing first trenches and second trenches that extend in different directions. These trenches segment the continuous insulating layer into isolated regions, allowing stress to be distributed and released during device extension, thereby preventing crack propagation while maintaining structural integrity.
Solution Approach 2:
Different trench structures are introduced at different locations within the insulating layer. First trenches extend in a first direction while second trenches extend in a second direction, creating localized stress relief zones where needed. The trenches are strategically positioned around electronic units to provide targeted protection without compromising overall device functionality.
2Reliability
If trenches are added to reduce stress, then crack resistance improves, but manufacturing precision requirements increase
Solution Approach 1:
The first trenches and second trenches are pre-configured in the insulating layer during the manufacturing process, before the device undergoes extension. The trenches are designed with specific orientations and positions that anticipate the stress patterns that will occur during device operation, allowing stress to be redirected into the trenches where it can be safely dissipated without requiring high-precision alignment during actual use.
3Reliability
If electronic units are positioned between trenches, then stress concentration on electronic units is reduced, but device complexity increases
Solution Approach 1:
The trenches act as intermediary stress-relief structures positioned between the electronic units and the external environment. By placing electronic units in the regions bounded by the trench network, the trenches serve as mediators that intercept and redirect stress away from the electronic units, protecting them from direct mechanical stress while maintaining a relatively simple overall device architecture.
Data Source
AI summary
A rollable electronic device with a rollable axis includes a base layer, an insulating layer, and one or more electronic units. The insulating layer is disposed on the base layer and includes a plurality of first trenches. The first trenches have a first longitudinal direction parallel to the rollable axis. The one or more electronic units are disposed on the insulating layer. In a top view, at least one of the electronic units is disposed between two adjacent first trenches of the first trenches, and the two adjacent first trenches are overlapped with each other along a direction perpendicular to the first longitudinal direction.