Flexible Display Panel Protrusion Stress Relief
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Solution Overview
Problem
Flexible display panels face stress issues in the bending region due to metal lead wires cracking under mechanical strain, leading to poor signal transmission and reduced service life, especially when manufacturing narrow border designs.
Innovation Solution
A flexible display panel design featuring an organic insulating layer with protrusions in the bending region, where the metal wires are configured to cover these protrusions, creating concave and convex surfaces to distribute stress and reduce cracking, using materials like acrylic resin, epoxy resin, or polycarbonate for the insulating layer and metals such as molybdenum, chromium, or silver for the metal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the binding region is bent to achieve narrow border design, then the display screen achieves narrow border and better flexibility, but the metal lead wires in the bending region are easily cracked due to stress
Solution Approach 1:
The patent applies local quality by creating protrusions specifically in the bending region where stress concentrates. These protrusions are not uniformly distributed across the entire structure but are localized to the critical bending area, providing stress relief exactly where needed without affecting other regions. The protrusions modify the local mechanical properties of the organic insulating layer to better withstand bending stresses.
Solution Approach 2:
The protrusions are pre-formed in the organic insulating layer before the bending operation occurs. This preliminary structural modification prepares the bending region to withstand the upcoming stress of bending, preventing wire cracks before they can occur during the actual bending process to achieve narrow border design.
2Loss of information
If multiple metal lead wires are arranged in the bending region to transmit signals, then signal transmission capability is improved, but the wires are more sensitive to mechanical force and prone to cracking
Solution Approach 1:
The protrusions in the organic insulating layer act as an intermediary structure between the metal lead wires and the bending stress. Instead of the wires directly承受 (bearing) the full mechanical stress, the protrusions absorb and distribute the stress, mediating the interaction between the rigid wires and the flexible bending motion, thereby reducing wire cracking while maintaining signal transmission.
3Length of moving object
If the bending radius is reduced to achieve narrow border, then the display flexibility is improved, but the stress in the bending region is maximized causing wire cracking
Solution Approach 1:
The protrusions introduce a controlled curvature modification to the otherwise flat organic insulating layer. By creating localized raised structures, the design distributes the curvature stress more evenly across the bending region, preventing stress concentration at single points and reducing the likelihood of wire cracking even when the overall bending radius is small for narrow border design.
Data Source
AI summary
A flexible display panel and a manufacturing method therefor. The flexible display panel comprises an organic insulating layer and a metal layer disposed on the organic insulating layer, and is divided into a display region located in the middle, a binding region located outside the display region, and a bending region located between the display region and the binding region. The organic insulating layer is provided with a plurality of protrusions in the bending region so that the surface of the organic insulating layer is uneven in the bending region. The metal layer comprises a plurality of metal wires penetrating the bending region, and each metal wire covers a part the protrusions of the organic insulating so that the surface the metal wire is also uneven along with the organic insulating layer. During the bending of the flexible display panel, the protrusions would release part of stress.