Stretchable Display Encapsulation Layout for Stress-Resistant Imaging
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Solution Overview
Problem
Existing stretchable display apparatuses face challenges in maintaining image quality and preventing damage from stress concentration when stretched or deformed.
Innovation Solution
A stretchable display apparatus is designed with a substrate featuring island portions, bridge portions, and openings, where light-emitting elements are encapsulated by first and second encapsulation layers, and supported by lower and upper adhesive layers, allowing for flexible stretching and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If encapsulation layers are made rigid to protect light-emitting elements, then protection capability is improved, but stress concentration and damage occur when stretched
Solution Approach 1:
The patent applies parameter changes by using encapsulation layers with different moduli in different regions. Specifically, the bridge portions have lower modulus (softer) material compared to the island portions, allowing the encapsulation layer to flex and stretch without cracking while still providing protection where needed.
Solution Approach 2:
The patent implements local quality by having different encapsulation layer properties in different locations. The island portions use higher modulus material for better protection of light-emitting elements, while bridge portions use lower modulus material for better stretchability, optimizing each region for its specific function.
2Adaptability or versatility
If encapsulation layers are made flexible to allow stretching, then stretchability is improved, but protection capability against external forces decreases
Solution Approach 1:
The patent implements local quality by having different encapsulation layer properties in different locations. The island portions use higher modulus material for better protection of light-emitting elements, while bridge portions use lower modulus material for better stretchability, optimizing each region for its specific function.
Solution Approach 2:
The patent applies segmentation by dividing the encapsulation layer into multiple regions (island portions and bridge portions) with different mechanical properties, allowing the structure to both protect sensitive components and accommodate stretching movements.
3Reliability
If openings are filled completely to prevent stress concentration, then damage resistance is improved, but light emission and image quality are affected
Solution Approach 1:
The patent applies local quality by selectively filling only the lower portions of openings with adhesive layer while leaving upper portions open. This localized approach provides stress distribution benefits without blocking light emission paths, optimizing both structural integrity and optical performance.
Data Source
AI summary
A display apparatus includes a substrate including island portions spaced apart from each other, a bridge portions connecting the island portions to each other, openings disposed between island portions, at least one light-emitting element arranged in each of the island portions, first encapsulation layers disposed on the island portions, respectively, each of the first encapsulation layers sealing the at least one light-emitting element, a second encapsulation layer disposed on the first encapsulation layers to cover the first encapsulation layer, sealing the plurality of island portions and the bridge portions, and filling at least an upper portion of the openings, a lower encapsulation layer disposed under the substrate, and a lower adhesive layer arranged between the lower encapsulation layer and the substrate, wherein the lower adhesive layer fills at least a portion of a lower portion of the openings.