Foldable Display With Segmented Bending Regions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current rollable display devices face issues with flexibility and stress damage during folding or expansion, leading to reduced lifespan.
Innovation Solution
A foldable display device design featuring a flexible substrate with distinct bending, non-foldable, and rollable portions, supported by a layer structure that includes a supporting layer adhered to the non-foldable portion, reducing stress concentration and enhancing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is folded or expanded to improve flexibility, then the screen-to-body ratio is improved, but stress is generated that may damage the device and reduce lifespan
Solution Approach 1:
The flexible substrate is divided into distinct functional regions: a foldable portion that can be folded, a bending portion that bends, and a non-foldable portion that remains stationary. This segmentation allows each region to perform its specific function while reducing overall stress on the device structure during folding operations
Solution Approach 2:
Different portions of the flexible substrate are assigned different mechanical properties and functions. The foldable portion is designed for folding, the bending portion for bending, and the non-foldable portion for maintaining structural stability. This local differentiation optimizes the device's flexibility while protecting critical areas from stress damage
2Strength
If the supporting layer is adhered to the non-foldable portion to reduce stress, then stress concentration is reduced, but the device structure becomes more complex
Solution Approach 1:
An adhesion layer is introduced as an intermediary component between the non-foldable portion of the flexible substrate and the supporting layer. This adhesion layer facilitates controlled stress distribution and reduces stress concentration at critical interfaces, thereby enhancing the device's overall strength and stress resistance
Solution Approach 2:
The device employs a composite layered structure consisting of the flexible substrate, supporting layer, adhesion layer, and display element. This multi-layer composite design combines materials with different mechanical properties to achieve optimal stress distribution, strength, and flexibility throughout the device
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 improves the flexibility and reduces stress on the display device, enhancing the screen-to-body ratio and reducing the risk of damage during folding or expansion.
Implementation Method 1
The adhesion layer is adhered between the non-foldable portion of the flexible substrate and the first portion of the supporting layer
Data Source
AI summary
A foldable display device includes a flexible substrate, a display element, a supporting layer and an adhesion layer. The flexible substrate includes a foldable portion, a bending portion and a non-foldable portion, wherein in a first state, the foldable portion is folded, in a second state, the foldable portion is unfolded, and in the first state and the second state, the bending portion and the non-foldable portion are partially overlapped. The display element is disposed on the flexible substrate. The circuit element is disposed on the bending portion. The flexible substrate is disposed between the supporting layer and the display element. The supporting layer includes a first portion and a second portion separated by a space, and the space and the bending portion are partially overlapped. The adhesion layer is adhered between the non-foldable portion of the flexible substrate and the first portion of the supporting layer.