Array Substrate Metal Trace Stress Distribution in Bending Region
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Solution Overview
Problem
In the manufacturing of ultra-narrow lower bezels for AMOLED display panels, the bending process often leads to metal trace breakage due to stress and deformation, posing a challenge in ensuring the reliability of metal traces during bending.
Innovation Solution
The implementation of a water-oxygen barrier layer only in the display region, combined with a multilayered metal trace structure of titanium-aluminum-titanium, and a structured layer design that includes polyimide base layers and buffer layers, helps distribute stress and enhance the strength of the metal trace during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-oxygen barrier layer is provided only in the display region, then stress distribution in the bending region is improved and metal trace breakage is prevented, but the structural complexity increases due to selective layer placement
Solution Approach 1:
The water-oxygen barrier layer is selectively disposed only in the display region rather than uniformly across the entire substrate. This local placement optimizes stress distribution precisely where needed (in the bending region) while avoiding unnecessary complexity in other areas, thereby improving metal trace reliability without excessively increasing overall device complexity.
2Shape
If the lower bezel is bent to achieve ultra-narrow design, then the display area is optimized, but the metal trace undergoes stress and deformation leading to breakage
Solution Approach 1:
The barrier layer is strategically positioned only in the display region, allowing the bending region to have different mechanical properties. This enables the lower bezel to achieve the desired ultra-narrow bent shape while the metal trace in the bending region experiences reduced stress and deformation, preventing breakage.
Data Source
AI summary
The present invention discloses an array substrate and a display device including the same, the array substrate including a display area and a non-display area, wherein the non-display area has a bending region connected to the display area; a first base layer extends from the display area to the bending region; a water-oxygen barrier layer is disposed on the first base layer of the display area; a second base layer is disposed on the water-oxygen barrier layer of the display area and the first base layer of the bending region; a metal trace disposed over the second base layer and extending from the display area to the bending region. In the present invention, a water-oxygen barrier layer only in the display region is provided, and a more reasonable functional layer is designed, which effectively improve stress distribution in the bending region during bending to prevent the metal trace from breakage.