Foldable Display Device Stress Reduction via Dual Bending Portions
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Solution Overview
Problem
Conventional foldable display devices suffer from degraded display quality and performance due to stress-induced damage in the bending areas, affecting the stability and reliability of the device.
Innovation Solution
A foldable display device design featuring two panels with bending portions that rotate around their respective axes, allowing for improved display quality by reducing stress on electrical elements and material layers, and utilizing a splicing mechanism to form an expanded display area with optical compensation layers to minimize image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is made foldable to increase portability and display area, then the ease of carrying and display area are improved, but the electrical elements and material layers near the folding areas are damaged by stress from bending
Solution Approach 1:
The display device is divided into multiple independent panels (first panel, second panel, third panel) that are connected through bending portions. Each panel can be independently supported and protected, with the bending portions serving as dedicated flexible connection regions that isolate stress from the display areas containing electrical elements.
Solution Approach 2:
The bending portions act as intermediary elements between the rigid panels, absorbing and distributing mechanical stress during folding operations. These intermediary regions are specifically designed to handle the mechanical deformation while protecting the electrical elements and material layers in the panel areas from direct stress exposure.
2Adaptability or versatility
If the bending portions are positioned adjacent to each other to enable folding, then the foldability is achieved, but the stress concentration at the bending areas degrades display quality
Solution Approach 1:
The bending portions are extracted and separated from the main panel structures, creating dedicated flexible connection regions. This extraction allows the bending portions to be optimized specifically for mechanical flexibility while the panel areas are optimized for display quality, with electrical elements positioned away from the high-stress bending zones.
Solution Approach 2:
Different regions of the display device are assigned different structural qualities: the panel areas maintain rigid, high-precision structures suitable for displaying images with electrical elements, while the bending portions are designed with flexible, stress-absorbing characteristics. This local differentiation ensures that each region performs its specific function optimally without compromising the other.
3Area of stationary object
If multiple panels are spliced together to form an expanded display area, then the display area is increased, but the image distortion and discontinuity at the splicing boundaries occur
Solution Approach 1:
Multiple panels are merged to form an integrated expanded display area, with the bending portions enabling the panels to work together as a unified foldable structure. The adjacent positioning of bending portions allows the panels to be spliced while maintaining structural integrity and visual continuity across the panel boundaries.
Data Source
AI summary
A foldable display device includes a first panel having a first flat portion and a first bending portion at one side of the first flat portion. The first bending portion has a first bending axis around which the first bending portion rotates. The foldable display device also includes a second panel having a second flat portion and a second bending portion at one side of the second flat portion. The second bending portion has a second bending axis around which the second bending portion rotates. The first bending portion and the second bending portion are arranged adjacent to each other.