Foldable Display Substrate Through-Hole Layout for Flatness
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Solution Overview
Problem
Flexible display devices face issues with waviness, curling, and cracking due to irregular surface roughness and stress distribution in metal substrates during folding and unfolding, which affect the folding reliability and surface flatness.
Innovation Solution
A substrate with distinct folding and unfolding regions, featuring differently sized through-holes on each surface to distribute stress evenly and minimize size deviations, allowing the unfolding region to naturally planarize the folding region, reducing waviness and preventing curling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal substrate is used for flexible display, then strength and durability are improved, but surface waviness and curling occur due to rolling process irregularities
Solution Approach 1:
The patent applies local quality by creating through-holes with different sizes at different locations on the substrate. The first through-holes in the folding region have different size characteristics than the second through-holes in the unfolding region, allowing each area to address its specific problem (waviness in folding region, curling in unfolding region) while maintaining overall substrate strength.
2Reliability
If through-holes are formed in the substrate for stress dispersion, then folding reliability is improved, but size deviations in opening regions cause bending deformation
Solution Approach 1:
The patent employs asymmetry by deliberately designing the second through-holes to have asymmetric opening sizes (2-1 opening region and 2-2 opening region with different dimensions). This asymmetric design compensates for stress distribution imbalances and prevents bending deformation, while still providing effective stress dispersion to improve folding reliability.
Data Source
AI summary
A substrate for display has one side or the other side thereof folded to face each other, has a first region defined as a folding region and a second area defined as an unfolding region, and has a plurality of first through-holes formed in the first region and a plurality of second through-holes formed in the second area, a second through-hole comprising a 2-1 opening area which opens to the one side, and a 2-2 opening area which opens to the other side, and the size of the 2-1 opening region Of at least one second through-hole being different from the size of the 2-2 opening area thereof.