OLED Trace Structure with Non-Orthogonal Layers for Bending Stress
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Solution Overview
Problem
The metal trace layer in OLED display panels is prone to breaking when the outer lead region is bent due to bending stress, as it is typically bent together with the flexible substrate.
Innovation Solution
A trace structure with two mutually insulated metal trace layers arranged on the outer lead region, where the traces intersect at a non-orthogonal angle with the center line of the bending region, reducing direct stress by increasing the trace contact area and promoting anti-bending performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the outer lead region is bent to the back side of the TFT substrate to realize flexibility, then the display form can be diversified, but the metal trace layer is prone to breaking due to bending stress
Solution Approach 1:
The metal trace layer is segmented into multiple layers (first metal trace layer and second metal trace layer) that are mutually insulated. This segmentation allows each layer to independently bear bending stress, preventing any single layer from breaking while maintaining electrical connectivity through the layered structure.
Solution Approach 2:
The patent transitions from a single-plane metal trace structure to a multi-layered three-dimensional structure. The first and second metal trace layers are arranged in different planes with insulation between them, allowing the traces to follow non-orthogonal paths that reduce bending stress concentration while maintaining electrical function.
2Ease of operation
If the metal trace layer is bent together with the substrate, then the outer lead region can be positioned on the back side, but the bending stress causes the metal trace layer to break easily
Solution Approach 1:
The metal trace layer is divided into multiple insulated layers, allowing each layer to be positioned independently on the substrate. This segmentation enables the traces to follow optimized paths that reduce bending stress while maintaining proper electrical connections between the outer lead region and the display panel.
Solution Approach 2:
The patent allows the metal trace layers to have dynamic positioning flexibility, where the first and second metal trace layers can be arranged at different locations and angles. This dynamic arrangement enables optimization of trace paths to minimize bending stress while maintaining electrical connectivity.
Data Source
AI summary
Disclosed is a trace structure of an organic light emitting diode display panel, comprising an array substrate, wherein the trace structure of the organic light emitting diode display panel comprises an outer lead region disposed on a substrate of the array substrate; wherein two metal trace layers which are mutually insulated are disposed on the outer lead region, a bending region is configured to the outer lead region, traces of the two metal trace layers and a center line of the bending region are arranged with a non-orthogonal included angle and the metal trace layers connect the organic light emitting diode display panel with external electrical signals.