Foldable Display Elastic Sheet Deformation Control
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Solution Overview
Problem
Foldable display apparatuses suffer from aesthetic issues due to wrinkles that occur when folded and unfolded, affecting their design and quality.
Innovation Solution
A foldable display apparatus design featuring a flexible display panel, a foldable support, an elastic sheet, and adhesive layers, where the elastic sheet and support are disconnected at the folding area to minimize deformation and wrinkle formation, with the elastic sheet having an elastic modulus between 5 GPa and 300 GPa and a thickness of 30 μm to 200 μm, and the adhesive layers having varying adhesive strengths to reduce bonding in specific areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the display panel is folded at the folding area, then portability is improved, but wrinkles occur that spoil aesthetics
Solution Approach 1:
The support structure is divided into multiple segments (first support, second support, third support) that can independently rotate relative to each other. This segmentation allows the support to adapt to the folded configuration while maintaining structural integrity and preventing wrinkle formation in the display panel.
Solution Approach 2:
The patent specifies precise parameter ranges for the elastic sheet (elastic modulus between 5 GPa and 300 GPa, thickness between 30 μm and 200 μm) to optimize its ability to accommodate folding without causing wrinkles. These parameter changes ensure the elastic sheet provides sufficient flexibility while maintaining structural stability.
2Stability of the object's composition
If adhesive layers are applied to bond components, then structural stability is improved, but deformation and wrinkles increase at the folding area
Solution Approach 1:
The adhesive layers are applied selectively in specific regions rather than uniformly across all surfaces. The first adhesive layer bonds the elastic sheet to the first support, while the second adhesive layer bonds the elastic sheet to the display panel. This localized bonding strategy maintains structural stability in non-folding areas while allowing controlled movement at the folding area to prevent wrinkles.
3Ease of operation
If the elastic sheet is made thinner for flexibility, then ease of folding is improved, but structural strength decreases
Solution Approach 1:
The patent defines an optimal thickness range for the elastic sheet (30 μm to 200 μm) that balances flexibility and structural strength. This parameter optimization ensures the sheet is thin enough to allow easy folding while maintaining sufficient strength to support the display panel and prevent damage during repeated folding operations.
4Ease of operation
If the elastic sheet is made more elastic for flexibility, then ease of folding is improved, but resistance to deformation decreases
Solution Approach 1:
The patent specifies an elastic modulus range (5 GPa to 300 GPa) that optimizes the balance between flexibility and deformation resistance. This parameter selection ensures the elastic sheet can accommodate folding movements while providing sufficient resistance to prevent excessive deformation and maintain the structural integrity of the display apparatus.
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 design effectively reduces the area of deformation and minimizes wrinkle visibility, enhancing the aesthetic appeal and durability of the display apparatus through reduced bending deformation and creep deformation upon repeated folding and unfolding.
Implementation Method 1
an elastic sheet which is foldable and has an elastic modulus between about 5 gigapascals and about 300 gigapascals
Data Source
AI summary
A display apparatus includes a display panel which is foldable at a folding area thereof; a foldable support which faces the display panel and is foldable together with the display panel; an elastic sheet between the foldable support and the display panel; a lower adhesive layer which is between the foldable support and the elastic sheet, and attaches the foldable support to the elastic sheet; and an upper adhesive layer which is between the elastic sheet and the display panel and attaches the elastic sheet to the display panel. Each of the foldable support, the elastic sheet, the lower adhesive layer and the upper adhesive layer is disconnected at the folding area.