Flexible OLED Side Sealant Alternating Width Pattern
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Solution Overview
Problem
Flexible organic light emitting display devices face challenges in maintaining sufficient flexibility and preventing stress-induced delamination or cracking of side sealants when rolled or folded, due to the lack of a novel side sealant pattern that can effectively distribute stress and maintain the integrity of the display panel.
Innovation Solution
A flexible organic light emitting display device with a side sealant having a preset pattern that alternates between two widths, where one width is narrower than the other, applied in a non-uniform manner to distribute stress and prevent delamination or cracking, enhancing the panel's flexibility and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform width side sealant is used, then the sealing performance is maintained, but stress concentration occurs during rolling or folding operations
Solution Approach 1:
The side sealant is divided into multiple sections with alternating narrow and wide widths along its length. This segmentation creates a pattern where narrow sections (first width) and wide sections (second width) alternate, allowing the sealant to flex and distribute stress during rolling or folding operations while maintaining adequate sealing performance in the wide sections.
Solution Approach 2:
Different sections of the side sealant are given different widths to serve different functions. The narrow sections provide flexibility and stress relief, while the wide sections provide adequate sealing coverage. This local variation in geometry allows each part of the sealant to optimize its performance for its specific role in the alternating pattern.
2Reliability
If the side sealant width is increased to prevent delamination, then adhesion is improved, but flexibility is reduced
Solution Approach 1:
The side sealant is segmented into alternating narrow and wide sections along its length. The narrow sections maintain flexibility and allow the sealant to conform to curved surfaces during rolling or folding, while the wide sections provide sufficient adhesion area to prevent delamination. This segmented approach allows both flexibility and adhesion to coexist in different parts of the same component.
Solution Approach 2:
The side sealant exhibits local quality variation through its alternating width pattern. Specific sections are designed with narrow widths to provide flexibility and stress relief, while other sections have wide widths to ensure adequate adhesion. This spatial variation in geometry allows the sealant to simultaneously satisfy both flexibility and adhesion requirements that cannot be met by a uniform design.
3Adaptability or versatility
If a narrow side sealant is used to enhance flexibility, then adaptability is improved, but stress concentration increases
Solution Approach 1:
The side sealant is segmented into an alternating pattern of narrow and wide sections. The narrow sections provide flexibility and adaptability for rolling or folding operations, while the wide sections act as stress-relief zones that distribute applied loads over a larger area, preventing stress concentration that would occur in a uniformly narrow sealant.
Solution Approach 2:
The side sealant is designed with local quality variation where different sections have different widths optimized for their specific functions. Narrow sections are positioned where flexibility is most needed, while wide sections are positioned to provide stress distribution and prevent concentration. This localized optimization resolves the contradiction between flexibility and stress concentration.
Data Source
AI summary
A flexible organic light emitting display device includes a substrate having a display area and a side sealant pattern covering a portion outside the display area, wherein the side sealant pattern has a first width and a second width narrower than the first width, in the side sealant pattern, a pattern with the first width and a pattern with the second width alternate.