Foldable Display Protrusion Adhesive Flow Prevention
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Solution Overview
Problem
Foldable display devices face challenges in maintaining foldability and impact resistance due to adhesive flow into opening patterns during folding, leading to potential defects and reduced durability.
Innovation Solution
Incorporating a first and second support substrate with protrusions adjacent to the folding area and an adhesive layer limited to non-folding areas, which prevents adhesive flow into the folding area, maintaining an air gap and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied between support substrates to bond them together, then bonding strength is improved, but adhesive flows into opening patterns during folding causing defects and reducing durability
Solution Approach 1:
The support substrate is divided into multiple regions: a first region with opening patterns for folding flexibility and a second region without opening patterns for adhesive bonding. This segmentation allows the adhesive to be applied only in the second region where it can provide bonding strength without flowing into the folding area, thus resolving the contradiction between bonding strength and durability.
Solution Approach 2:
Different regions of the support substrate are given different properties: the first region has opening patterns to enable folding while the second region has continuous structure to prevent adhesive flow. The adhesive layer is also positioned only in the second region. This local differentiation allows the structure to simultaneously achieve bonding strength in the adhesive region and foldability in the opening pattern region, resolving the contradiction between strength and reliability.
2Adaptability or versatility
If opening patterns are created in the support substrate to enable folding, then foldability is improved, but structural integrity and impact resistance are reduced
Solution Approach 1:
The support substrate is segmented into a first region with opening patterns for folding and a second region without opening patterns for maintaining structural integrity. The adhesive layer is positioned only in the second region, creating a bonded area that enhances impact resistance while the first region with opening patterns maintains foldability. This segmentation resolves the contradiction between foldability and impact resistance.
Solution Approach 2:
The invention merges the adhesive layer with the second region of the support substrate that has no opening patterns, creating a combined structure that provides both bonding strength and structural integrity. This merged region acts as a reinforcement that improves impact resistance while the separate first region with opening patterns maintains foldability, thus resolving the contradiction.
Data Source
AI summary
Discussed is a foldable display device. The foldable display device includes a display panel including a folding area and non-folding areas located on opposite sides of the folding area, a first support substrate disposed under the display panel to support the display panel and including a plurality of opening patterns corresponding to the folding area, a second support substrate disposed between the display panel and the first support substrate and an adhesive layer corresponding to the non-folding areas and disposed between the first support substrate and the second support substrate. At least one of the first support substrate and the second support substrate includes a protrusion located adjacent to the folding area and protruding therefrom.