Stress Adjustment Layer for Flexible Display Metal Trace Bending
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Solution Overview
Problem
Flexible OLED displays with full screens and narrow frames face issues with metal trace stress-strain problems when bent, leading to cracking and peeling, which affect signal transmission and screen performance.
Innovation Solution
A stress adjustment layer is disposed on the metal trace in the bending region of the display panel, made from materials like polyimide or polyarylate, to adjust tensile stress and shift the neutral plane closer to the metal trace, improving stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is bent to achieve full screen and narrow frame, then the display experience is improved, but the metal trace suffers from stress-strain problems leading to cracking and peeling
Solution Approach 1:
The patent applies different material properties to different regions of the display panel. Specifically, the neutral plane is positioned within or near the metal trace layer in the bending region, while other regions maintain their original structure. This local adjustment of the neutral plane position reduces stress concentration on the metal trace during bending, preventing cracking and peeling while maintaining overall display performance.
Solution Approach 2:
The patent changes the physical parameter of the neutral plane position by adjusting the thickness and material composition of layers in the bending region. By controlling the neutral plane to coincide with or be close to the metal trace layer, the stress distribution is optimized to minimize tensile stress on the metal trace during bending operations.
2Ease of operation
If the neutral plane is positioned in the flexible substrate during bending, then the bending flexibility is improved, but the metal trace experiences excessive tensile stress
Solution Approach 1:
The patent modifies the neutral plane position specifically in the bending region where the metal trace is located, while maintaining the original neutral plane position in non-bending regions. This localized adjustment ensures that the metal trace experiences minimal tensile stress during bending without compromising the overall bending flexibility of the display panel.
Solution Approach 2:
The patent introduces an intermediate layer or adjusts the thickness of existing layers between the flexible substrate and the metal trace to reposition the neutral plane. This intermediate structure acts as a mediator that redistributes stress during bending, protecting the metal trace from excessive tensile stress while maintaining the flexibility of the substrate.
Data Source
AI summary
A display panel and a display device having the display panel are provided. The display panel includes a display region for displaying images; a non-display region disposed outside the display region, and the non-display region includes a bending region; a metal trace extending from the display region to the bending region; and a stress adjustment layer disposed on the metal trace and corresponding to the bending region. The display panel and the display device having the display panel can effectively solve problems such as performance degradation and failure caused by cracking and peeling on the metal trace when the display panel is bent through adding the stress adjustment layer which has a material with the same flexibility as the flexible substrate on an array substrate or different flexibility from the flexible substrate on the array substrate.