Flexible Display Insulation Unevenness for Crack Prevention
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Solution Overview
Problem
Flexible organic light-emitting display apparatuses face challenges in handling due to their bendable substrates, which can lead to cracks and reduced reliability, especially in the bending areas during manufacturing.
Innovation Solution
Incorporating a first and second inorganic insulation layer with unevenness, such as a stepped or V-shaped depression, on the flexible substrate's bending area to distribute stress and prevent cracks, while maintaining a width less than 1 mm and aligning these unevenness with the bending axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate is used to enable bending, then flexibility and adaptability are improved, but handling difficulty and crack risk increase during manufacturing
Solution Approach 1:
The patent applies local quality by creating an uneven surface structure specifically in the bending area of the flexible substrate, while keeping other areas flat. This localized unevenness (with protrusions or depressions) is formed only where bending occurs, providing enhanced stress distribution exactly where needed without affecting the overall substrate properties or manufacturing processes elsewhere.
2Adaptability or versatility
If the flexible substrate is easily bent, then flexibility is improved, but handling difficulty increases during manufacturing
Solution Approach 1:
The patent applies preliminary action by forming the uneven surface structure (protrusions or depressions) in the bending area before the actual bending operation occurs. This pre-formed structure prepares the substrate to distribute stress evenly during bending, preventing cracks and making the substrate easier to handle during subsequent manufacturing processes without compromising its bendability.
Data Source
AI summary
A display apparatus includes a flexible substrate and a first insulation layer disposed on the flexible substrate. The flexible substrate includes a bending area. The first insulation layer includes a first unevenness disposed over the bending area. The first unevenness includes two or more steps in at least a portion of the first unevenness.