Foldable Display Panel Bonding and Magnetic Alignment
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Solution Overview
Problem
Foldable display apparatuses face reliability issues due to stress-induced cracks in the bending area of flexible display panels when repeatedly folded and unfolded, leading to deterioration in panel reliability.
Innovation Solution
A foldable display apparatus comprising two display panels with bonded inner edge portions and a panel supporter that guides the panels to bend at a specific curvature, minimizing stress on the bending areas and using magnetic thin film patterns for self-alignment to match boundary portions, thereby preventing cracks and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible display panel is repeatedly folded and unfolded on the basis of the hinge unit, then the display apparatus can achieve foldable functionality with large screen, but stress occurs in the bending area causing cracks and deteriorating panel reliability
Solution Approach 1:
The display panel is divided into a first display panel and a second display panel, with only their inner edge portions bonded together. This segmentation allows the panels to be folded without fully collapsing, reducing stress concentration in the bending area while maintaining foldable functionality.
Solution Approach 2:
Only the inner edge portions of the display panels are bonded to each other, while the rest of the panels remain free to move. This localized bonding approach reduces the overall stress on the bending area compared to full-panel bonding, preventing cracks while enabling folding.
2Shape
If one side area and the other side area of the flexible display panel are fully folded to adjoin each other on the basis of the bending area, then a compact folded state is achieved, but it is likely that crack occurs in the bending area
Solution Approach 1:
The display panel is segmented into two separate panels (first display panel and second display panel) that are only bonded at their inner edge portions. This segmentation prevents full folding of both sides, reducing stress on the bending area while still achieving a compact folded configuration.
Solution Approach 2:
Instead of fully folding both side areas to adjoin each other, only the inner edge portions are bonded together. This partial folding action is sufficient to achieve the desired compact state while avoiding excessive stress that would cause cracks.
3Reliability
If two display panels are used to realize one seamless screen, then the boundary portions can be matched to reduce stress, but the device complexity increases
Solution Approach 1:
Two display panels are combined to form a single large display area, with their inner edge portions bonded together. This merging approach allows the boundary portions to be matched and reduces stress concentration, preventing cracks while maintaining a simple overall structure.
Solution Approach 2:
The first display panel and second display panel serve multiple functions: they form a seamless display screen, provide structural support, and enable folding functionality. This multi-functionality reduces the need for additional components, keeping the device complexity manageable.
Data Source
AI summary
A foldable display apparatus that may realize one seamless screen by using two display panels is discussed. The foldable display apparatus can include a first display panel having a first display area; a second display panel having a second display area; and a panel supporter supporting the first and second display panels to mutually fold or unfold the first and second display panels, wherein boundary portions of the first display area of the first display panel and the second display area of the second display panel are matched with each other in a state that the first and second display panels are unfolded.