Foldable Display Support Plate Layout for Crease and Sag Control
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Solution Overview
Problem
Display devices, particularly bendable and foldable ones, suffer from creasing and sagging phenomena, and are prone to the introduction of foreign substances.
Innovation Solution
A display device design incorporating a display panel with a folding area and non-folding areas, featuring support plates, adhesive layers, and a step compensation film to manage stress and separation spaces, enhancing structural integrity and minimizing foreign substance entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a continuous support plate is used below the display panel, then structural strength is improved, but creasing and sagging phenomena occur in the folding area
Solution Approach 1:
The continuous support plate is divided into multiple separate support plates positioned in non-folding areas. This segmentation allows the folding area to remain free of rigid structures that cause creasing, while still providing structural support where needed. The support plates are arranged to span across the folding area without touching it, maintaining display panel stability without inducing folds.
2Strength
If adhesive layers are applied continuously across the support plate, then bonding strength is improved, but foreign substances are introduced into the folding area
Solution Approach 1:
The continuous adhesive layer is segmented into multiple discrete adhesive layers, each positioned between the display panel and individual support plates. This segmentation prevents adhesive and foreign substances from migrating into the folding area, as each adhesive layer is confined to its specific non-folding region. The folding area remains free of adhesive contamination while maintaining bonding strength in the non-folding areas.
3Adaptability or versatility
If the display panel is made flexible for folding, then portability is improved, but creasing and sagging increase
Solution Approach 1:
The display panel exhibits different mechanical properties in different regions: flexible in the folding area to enable portability, and supported/stabilized in the non-folding areas where support plates are positioned. This local differentiation allows the panel to fold without creasing in the folding area while maintaining structural integrity in the supported non-folding areas.
Data Source
AI summary
Provided is a display device including a display panel including a folding area, and a first non-folding area and a second non-folding area on respective sides of the folding area, a lower protective film below a surface of the display panel, a support plate below the lower protective film, and including a first support plate in the first non-folding area, and a second support plate in the second non-folding area, and defining a first separation space between the first support plate and the second support plate, a first adhesive layer between the lower protective film and the support plate, and including a first sub-adhesive layer overlapping the first support plate, and a second sub-adhesive layer overlapping the second support plate, and defining a second separation space between the first sub-adhesive layer and the second sub-adhesive layer, and a step compensation film in the first separation space and in the second separation space.