Foldable Display Substrate Through-Hole Layout for Stress Relief
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Solution Overview
Problem
Flexible display devices face issues with folding reliability due to waviness, curling, and stress distribution in metal substrates, leading to cracks and deformation during repeated folding and unfolding operations.
Innovation Solution
A substrate design 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 and reduce waviness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal substrate is used for flexible display, then strength and durability are improved, but waviness and curling occur during folding operations
Solution Approach 1:
The patent introduces through-holes in the metal substrate to create a porous structure that reduces waviness and curling during folding operations. The through-holes allow stress distribution and prevent deformation while maintaining the overall strength of the substrate.
Solution Approach 2:
The patent combines metal substrate with insulating layers and protective films to create a composite structure that maintains strength while reducing unwanted deformation and curling during flexing operations.
2Reliability
If openings are formed in the substrate for stress dispersion, then folding reliability is improved, but size deviations and bending occur
Solution Approach 1:
The patent applies different opening sizes at different locations within the through-holes. The first opening size is formed at a first location and a second opening size is formed at a second location, allowing localized stress management while maintaining overall structural integrity and preventing bending.
3Adaptability or versatility
If the substrate is folded repeatedly, then flexibility and portability are improved, but cracks and deformations occur
Solution Approach 1:
The through-holes create a porous structure that allows the substrate to flex repeatedly without cracking. The openings enable stress distribution during folding and unfolding operations, maintaining substrate integrity while providing the required flexibility for portability.
4Stress or pressure
If through-holes are formed with different opening sizes, then stress distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The patent implements different opening sizes at different locations within the through-holes to optimize stress distribution. This localized variation in opening size allows tailored stress management in different regions of the substrate while using standard manufacturing processes.
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.