Curved Insulation Layer for Flexible Display Pad Reliability
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Solution Overview
Problem
Flexible display apparatuses face issues with partial detachment and stripping of layers at the interface between insulation layers and pads, leading to potential failures in flexible display technology.
Innovation Solution
A display apparatus design featuring a non-flat insulation layer structure between pads, where the thickness decreases progressively toward the center, minimizing the risk of partial detachment and stripping by distributing stress more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat insulation layer is used between pads, then the manufacturing process is simple, but partial detachment and stripping of layers occur at the interface
Solution Approach 1:
The insulation layer is designed with a curved surface where the thickness decreases progressively from the periphery toward the center, forming a non-flat structure. This curvature redistributes the mechanical stress at the interface between the insulation layer and pads, preventing concentration of stress that causes detachment and stripping, thereby improving layer bonding reliability without excessive structural complexity
Solution Approach 2:
The insulation layer exhibits varying thickness across different locations, with greater thickness at the periphery and reduced thickness at the center. This local variation in geometry optimizes the stress distribution profile, providing enhanced bonding reliability at critical interface regions while maintaining overall structural integrity
2Reliability
If the insulation layer thickness is uniform, then the manufacturing precision is easier to control, but stress concentrates at the interface causing detachment
Solution Approach 1:
The curved surface profile of the insulation layer, with thickness decreasing from periphery to center, is designed to naturally distribute mechanical stress away from the interface. This geometric approach addresses the stress concentration problem without requiring complex multi-layer structures, balancing manufacturing feasibility with improved interface bonding reliability
Solution Approach 2:
The insulation layer thickness parameter is deliberately varied across the spatial domain, transitioning from thicker regions at the periphery to thinner regions at the center. This parameter gradient modifies the stress distribution characteristics, preventing stress concentration at the interface and improving bonding reliability while remaining manufacturable through controlled deposition or lamination processes
Data Source
AI summary
A display apparatus may include a substrate including a display portion, and a non-display portion at a periphery of the display portion and including a pad area. The display apparatus may further include a plurality of signal lines at the display portion and the non-display portion, a plurality of pads respectively connected with the plurality of signal lines in the pad area, and an insulation layer on the substrate between the plurality of pads. A first distance between the substrate and a center portion of the insulation layer may be smaller than a second distance between the substrate and a periphery portion of the insulation layer.