Elastic Recovery Layer for Foldable Display Bending and Impact
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Solution Overview
Problem
Foldable display apparatuses face issues of film layer stripping or rupture due to repeated bending, arching that cannot be fully flattened, and impact-induced package failure leading to abnormal display.
Innovation Solution
Incorporating an elastic recovery layer on the package layer of the display panel, which assists in arching recovery after bending and absorbs impact energy to prevent film layer stripping or rupture, and protect the package layer from failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a foldable display apparatus is designed with a large-sized display screen, then the visual experience is improved, but the portability deteriorates
Solution Approach 1:
The display apparatus employs a flexible display panel that can dynamically change its configuration between folded and unfolded states. The neutral plane is positioned within the display panel to enable controlled bending dynamics, allowing the large display to be folded into a compact form for portability while maintaining full screen area when unfolded for visual experience.
Solution Approach 2:
The display panel is designed to fold onto itself, with the flexible substrate allowing one portion to be nested within or alongside another portion. This nesting capability enables the large display screen to be compacted into a smaller form factor for easy carrying, while the full display area is restored when unfolded.
2Adaptability or versatility
If the display panel is bent repeatedly, then the foldable functionality is achieved, but film layer stripping or rupture occurs
Solution Approach 1:
The patent modifies the mechanical parameters of the display panel by introducing an elasticity-adjusting layer that changes the stress distribution during bending. This layer alters the neutral plane position and reduces the bending stress on the film layers, enabling repeated folding without causing film layer stripping or rupture while maintaining foldable functionality.
Solution Approach 2:
The elasticity-adjusting layer acts as a cushioning element positioned beforehand within the display panel structure. This layer absorbs and distributes the mechanical stress from repeated bending cycles, protecting the film layers from damage before stripping or rupture can occur, thereby ensuring long-term reliability of the foldable display.
3Ease of operation
If the display panel is made flexible for folding, then portability is improved, but impact resistance deteriorates
Solution Approach 1:
The display panel employs a composite structure combining flexible materials with an elasticity-adjusting layer and protective packaging layers. This composite design maintains the flexibility needed for portability while the elasticity-adjusting layer and package layer work together to provide enhanced impact resistance, protecting the display from damage during drops or external impacts.
Solution Approach 2:
The package layer and elasticity-adjusting layer are positioned beforehand within the display panel structure to provide cushioning protection. When impact occurs, these layers absorb and distribute the impact energy, protecting the underlying display components from damage while maintaining the flexible, portable form factor.
4Reliability
If the neutral plane is positioned within the display panel, then bending stress is reduced, but additional layers are required
Solution Approach 1:
The patent introduces an elasticity-adjusting layer that fundamentally changes the mechanical parameters of the display panel. This layer enables precise positioning of the neutral plane within the panel structure, optimizing stress distribution during bending. While this adds a layer to the structure, it significantly reduces bending stress on critical components, improving reliability of the foldable display.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The elastic recovery layer enhances the display panel's ability to recover from bending without film layer stripping or rupture and improves impact resistance, preventing abnormal displays due to package failure.
Implementation Method 1
the elastic recovery layer has good damping performance. When a display panel is subjected to impact, the elastic recovery layer can absorb impact energy
Implementation Method 2
the elastic recovery layer has a relatively good capability of recovering to an initial state after deformation. When the display panel changes from a bent state to a flattened state, the elastic recovery layer is configured to assist another film layer in the panel in performing arching recovery after bending
Data Source
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AI summary
A display panel (100) and a display apparatus are provided. The display panel (100) includes a display layer (102), a package layer (103), and a functional film layer (104) that are stacked in sequence, where the display layer (102) includes a plurality of light emitting devices (20). The functional film layer (104) is located on a side of the package layer (103) that is far away from the display layer (102), the functional film layer (104) includes at least one elastic recovery layer (41), and the display panel (100) includes a bendable area (10). The elastic recovery layer (41) is at least located in the bendable area (10). The elastic recovery layer (41) can assist another film layer in performing arching recovery after bending, thereby reducing a risk that repeated bending causes film layer stripping or rupture and the arching of the bending part cannot be recovered in the flattened state. In addition, the elastic recovery layer (41) can protect the package layer (103) on the light emitting device (20) when the display panel (100) is subjected to impact, so as to avoid abnormal display due to a package failure, thereby improving an impact resistance capability of the display panel (100).