Foldable Display Module With Segmented Adhesive Hinge Support
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Solution Overview
Problem
Existing foldable display apparatuses face challenges in maintaining structural integrity and reliability during folding and unfolding, particularly in ensuring the flexible display panel's protection and stability across various states.
Innovation Solution
A foldable display module comprising a support layer, adhesive layer, flexible display panel, and protective layer, with specific adhesive configurations and structural elements to enhance stability and protection, including a middle frame for support and a protective layer for impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible display panel is made fully adhesive to ensure structural integrity, then reliability is improved, but the bending flexibility and foldability deteriorate
Solution Approach 1:
The adhesive layer is segmented into multiple discrete adhesive portions (first adhesive portions and second adhesive portions) positioned at specific locations rather than forming a continuous adhesive layer. This segmentation allows the display panel to bend at non-adhesive regions while maintaining structural integrity through localized adhesive bonding points.
Solution Approach 2:
Different regions of the display panel have different adhesive properties - some areas have adhesive layers for structural support while other areas are non-adhesive to enable bending. This local differentiation of adhesive quality allows simultaneous achievement of reliability and flexibility.
2Strength
If the adhesive layer is made continuous to ensure strong bonding, then strength is improved, but the crease formation and display uniformity deteriorate
Solution Approach 1:
The continuous adhesive layer is divided into discrete adhesive portions positioned at edges and corners of the display panel. This segmentation maintains strong bonding at critical structural locations while preventing adhesive interference with the bending region, thereby eliminating crease formation and maintaining display uniformity.
Solution Approach 2:
The adhesive material is extracted from the bending region entirely, creating non-adhesive areas where the panel can flex freely. This removal of adhesive from critical bending zones prevents crease formation while sufficient adhesive remains at edge portions to maintain overall bonding strength.
3Reliability
If the protective layer is made thick to improve impact resistance, then reliability is improved, but the flexibility and foldability deteriorate
Solution Approach 1:
The protective layer structure is segmented with adhesive portions positioned at edges and corners, allowing the central bending region to remain flexible and foldable while edge portions provide structural support and impact resistance through adhesive bonding to the support layer.
Solution Approach 2:
Different regions of the protective layer have different functional qualities - edge regions provide structural support and impact resistance through adhesive bonding, while the central bending region maintains flexibility and foldability with minimal adhesive interference.
Data Source
AI summary
A foldable display module includes a support layer, an adhesive layer, a flexible display panel and a protective layer. The flexible display panel is located on the adhesive layer. The flexible display panel includes first display portions and at least one second display portion. The first display portions are sequentially arranged in a first direction. A second display portion is located between two adjacent first display portions. The second display portion is bendable, and a bending axis is along a second direction. The second display portion has a non-adhesive region and adhesive regions located on two opposite sides of the non-adhesive region in the second direction. The adhesive layer includes first adhesive portions and second adhesive portions. A first adhesive portion is disposed between a first display portion and the support layer. At least one second adhesive portion is disposed in an adhesive region.