Bending Protective Layer Thickness Control for Display Crack Prevention
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Solution Overview
Problem
Display apparatuses face issues with cracks and driving failures in the bending area due to stress concentration on connection lines during bending, which can lead to defects and reduced reliability.
Innovation Solution
A display apparatus design that includes a substrate with a bending area, a mesh layer with varying opening portions, and a bending protective layer, where the mesh layer extends to the first and second areas, and the bending protective layer fills these openings, controlling its thickness to minimize stress on connection lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bending protective layer is added to protect connection lines in the bending area, then reliability is improved, but device complexity increases
Solution Approach 1:
The bending protective layer is divided into multiple segments with different thicknesses corresponding to different opening portions in the mesh layer. This segmentation allows the protective layer to provide enhanced protection where needed while maintaining overall structural simplicity, resolving the contradiction between reliability improvement and device complexity increase.
Solution Approach 2:
The bending protective layer exhibits local quality variations through its different thickness regions - thicker portions over critical connection lines in the bending area and thinner portions elsewhere. This localized differentiation provides targeted protection to improve reliability without uniformly increasing device complexity across the entire structure.
2Strength
If the bending protective layer thickness is increased to reduce cracks, then strength is improved, but stress distribution worsens
Solution Approach 1:
The bending protective layer is designed with non-uniform thickness where thicker regions are positioned over connection lines in the bending area to provide enhanced strength and crack resistance, while thinner regions are positioned in areas requiring flexibility. This local quality differentiation resolves the contradiction by providing strength where needed without creating harmful stress concentration.
Solution Approach 2:
The thickness parameter of the bending protective layer is varied spatially across different regions of the display apparatus. By changing this physical parameter from uniform to non-uniform distribution, the layer achieves both increased strength in critical areas and improved stress distribution overall, resolving the apparent contradiction between strength enhancement and stress concentration.
Data Source
AI summary
A display apparatus includes a substrate having a first area, a second area, and a bending area between the first area and the second area, a display element in the first area, a mesh layer overlapping the bending area, and defining opening portions including a first opening portion and a second opening portion, which have different respective sizes, and a bending protective layer on the mesh layer.