Foldable Display Panel Wedge Structure for Shear Stress Relief
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing foldable display panels face high shear stress and a high risk of debonding and failure between film layers, particularly at the secondary bending part, due to a small bending radius and excessive shear stress.
Innovation Solution
The display panel design features a symmetrical water droplet-shaped bending part with asymmetrical distances between flat parts, forming a wedge-shaped structure to reduce shear stress and peeling risk, incorporating arc and straight edges, transition bending parts with controlled angles, and supporting layers with through holes and grooves to distribute stress evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the bending radius is reduced to achieve thin design, then the portability is improved, but the interlayer stress and shear stress increase sharply causing debonding and fracture
Solution Approach 1:
The patent applies asymmetry by designing the bending part with a water droplet cross-sectional shape where the thickness is asymmetric: the first distance from the end of flat parts to the first plane is larger than the second distance. This asymmetric thickness distribution creates a wedge-shaped structure that reduces shear stress concentration at the secondary bending part, resolving the contradiction between small bending radius and interlayer bonding strength
Solution Approach 2:
The patent applies local quality by creating different structural characteristics in different regions: the bending part has a specific water droplet shape with arc edges and straight edges, while flat parts have different thickness distances (first distance > second distance). This localized structural optimization reduces shear stress at critical areas without compromising overall flexibility, addressing the contradiction between portability and bonding strength
2Length of moving object
If the bending radius is smaller for thin design, then the portability is improved, but the risk of debonding and fracture between film layers increases
Solution Approach 1:
The asymmetric water droplet shape with first distance > second distance creates a wedge structure that distributes stress more evenly across film layers during folding, reducing the risk of debonding and fracture while maintaining small bending radius for portability
Solution Approach 2:
The patent designs the bending part with specific geometric features (arc edges, straight edges, water droplet shape) beforehand to cushion and distribute the stress that will occur during folding operations, preventing debonding and fracture before they can happen
Data Source
AI summary
A display panel and a display device are provided, and the display panel includes two flat parts and a bending part connecting the two flat parts. The display panel has a folded state. In the folded state, the bending part is symmetrical about a first plane, and the two flat parts are symmetrical about the first plane. A distance between an end of each of the two flat parts proximate to the bending part and the first plane is a first distance, a distance between an end of each of the two flat parts facing away from the bending part and the first plane is a second distance, and the first distance is larger than the second distance.