Stretchable Display Line Units with Holes to Block Crack Propagation
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Solution Overview
Problem
Current display devices face challenges in maintaining stretching reliability, reducing stress and resistance, and preventing crack propagation in line units, leading to potential disconnection during stretching.
Innovation Solution
Incorporating a stretchable lower substrate with plate patterns, line units, and conductive members filled in holes at peak stress areas to act as crack stoppers, which are designed to block crack propagation and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If holes are formed in peak stress areas of line units, then crack propagation is blocked, but device complexity increases
Solution Approach 1:
The line unit is segmented by forming holes at peak stress areas, dividing the continuous conductive line into sections. This segmentation prevents crack propagation across the entire line while maintaining electrical connectivity through alternative paths, thereby improving reliability without requiring complete redesign of the line structure.
Solution Approach 2:
The holes act as intermediary elements that mediate between the stress concentration points and the conductive line. By positioning holes at peak stress areas, they serve as crack stoppers that intercept and block crack propagation, protecting the continuity of the line unit while allowing the structure to handle stress more effectively.
2Reliability
If conductive members are filled in holes, then resistance increase is reduced, but manufacturing complexity increases
Solution Approach 1:
The holes are formed and positioned in advance during the manufacturing process, before the conductive members are filled. This preliminary action allows for precise positioning of crack stoppers at peak stress areas and facilitates subsequent filling operations, making the overall manufacturing process more manageable despite the added complexity.
Solution Approach 2:
The conductive members are nested within the holes, creating a hierarchical structure where the holes serve as containers for the conductive material. This nesting approach ensures that the conductive members are precisely positioned at critical locations while maintaining the crack-stopping function of the holes, and can be integrated into existing manufacturing workflows.
Data Source
AI summary
According to an aspect of the present disclosure, a display device includes a stretchable lower substrate; a plurality of plate patterns on the lower substrate and spaced apart from each other, a plurality of line units between the plurality of plate patterns; a plurality of holes in a peak area of the plurality of line units; and a plurality of conductive members filled in the plurality of holes. Accordingly, the plurality of holes are formed in a peak area in which the stress is concentrated so that when the crack is generated, the crack may be blocked so as not to propagate to the other part of the line unit from the plurality of holes.