Flexible Display Panel Wiring Segmentation for Bending Integrity
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Solution Overview
Problem
Flexible display panels with titanium-aluminum-titanium wiring are prone to breaking during the bending process, leading to damage and impaired functionality.
Innovation Solution
A flexible display panel design featuring first via holes that penetrate through multiple insulating layers to connect the source/drain metal layer with the active layer, and second contact holes of varying depths on the second interlayer insulating layer, made of polyimide, which helps maintain structural integrity during bending by preventing wiring breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If titanium-aluminum-titanium wiring is used in flexible display panel, then electrical conductivity is improved, but wiring is easily broken during bending process
Solution Approach 1:
The patent divides the wiring structure into multiple segments: first wiring layer, second wiring layer, and third wiring layer, each separated by insulating layers. This segmentation allows each layer to bear different mechanical stresses during bending, preventing concentrated stress from breaking the entire wiring structure. The titanium-aluminum-titanium wiring is distributed across multiple layers rather than concentrated in a single layer, improving overall reliability during flexing.
Solution Approach 2:
The patent transitions from a single-plane wiring structure to a multi-layer three-dimensional wiring architecture. By stacking wiring layers vertically with insulating layers in between, the design adds the vertical dimension to the wiring structure. This dimensional change distributes mechanical stress across multiple planes, preventing breakage during bending while maintaining electrical conductivity through vertical vias that connect the layers.
2Reliability
If multiple insulating layers are added to protect wiring, then wiring protection is improved, but device complexity increases
Solution Approach 1:
The insulating layers in the patent serve multiple functions simultaneously: they provide electrical insulation between adjacent wiring layers, act as mechanical buffers to reduce stress concentration during bending, and serve as structural support for the multi-layer architecture. This multi-functionality reduces the need for additional specialized protective layers, thereby limiting the increase in device complexity while maintaining wiring protection.
Data Source
AI summary
A flexible display panel is provided, including a flexible base, a barrier layer, a buffer layer, an active layer and a gate insulating layer, a gate metal layer and a second insulating layer, a second metal layer and an interlayer insulating layer, a second interlayer insulating layer, and a source/drain metal layer; on the second interlayer insulating layer, a first via hole is formed to communicate with the source/drain metal layer and the active layer, and a second contact hole is formed to communicate with the source/drain metal layer and the second interlayer insulating layer. A manufacturing method of a flexible display panel and a display apparatus including the display panel are also provided. The disclosure can ensure the normal display of the flexible display panel during the bending process.