Stretchable Display Panel Layout for Edge Strain Distribution
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Solution Overview
Problem
Flexible display panels in rollable, foldable, bendable, and stretchable devices are prone to physical breakage and fatigue due to differences in elongation ratios between the display area and the peripheral area, leading to potential damage during use.
Innovation Solution
The display panel design includes stretchable units with islands, bridges, and openings, where the areas of islands and bridges gradually increase towards the peripheral area, and the openings gradually reduce, with specific shapes and sizes optimized to minimize stress concentration and prevent breakage, while the insulating layers and substrate accommodate these structural changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the display area and peripheral area have uniform structural dimensions, then manufacturing is simplified, but stress concentration occurs at the boundary during stretching causing physical breakage
Solution Approach 1:
The patent applies local quality by making the insulating layer thickness non-uniform: the first thickness in the display area is different from the second thickness in the peripheral area. Specifically, the insulating layer has a first thickness in the display area and a second thickness in the peripheral area, where the second thickness is greater than the first thickness. This local variation in thickness distributes stress evenly during stretching, preventing concentration at the boundary between display and peripheral areas while maintaining manufacturing feasibility through targeted thickness adjustment.
2Manufacturing precision
If the insulating layer has uniform thickness, then manufacturing precision is easier to maintain, but stress distribution becomes uneven during stretching leading to fatigue and breakage
Solution Approach 1:
The patent implements local quality by specifying different thicknesses for the insulating layer in different regions: a first thickness in the display area and a second thickness in the peripheral area, where the second thickness is greater than the first thickness. This localized thickness variation optimizes stress distribution during stretching operations, preventing fatigue and breakage at the boundary region while maintaining sufficient manufacturing precision through controlled thickness transitions.
3Adaptability or versatility
If the display panel is designed for flexibility and stretchability, then adaptability to various device configurations is improved, but the panel becomes more susceptible to physical breakage and fatigue
Solution Approach 1:
The patent applies parameter changes by modifying the insulating layer thickness parameter across different regions of the display panel. The insulating layer has a first thickness in the display area and a second thickness in the peripheral area, where the second thickness is greater than the first thickness. This parameter variation enables the panel to maintain flexibility and stretchability for adaptable device configurations while simultaneously improving reliability by distributing stress evenly during deformation, preventing physical breakage and fatigue.
Data Source
AI summary
The present disclosure relates to a display panel including a display area that can be stretched by including a plurality of stretching units and a peripheral area positioned at an edge of the display area. Each of the stretching units includes: a plurality of islands separately disposed to include a plurality of pixels disposed therein; a plurality of bridges extended from the islands to connect adjacent islands or to connect the islands with the peripheral area; and a plurality of openings disposed adjacent to the bridges, between the bridges, and between the bridges and the islands, wherein areas of the islands are gradually increased toward the peripheral area.