Organic Light Emitting Display Device Bending Area Routing Line Crack Prevention
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Solution Overview
Problem
Flexible organic light emitting display devices face issues with inorganic films breaking due to stress in the bending area, leading to cracks in the routing line, which limits the extent of bending and bezel reduction.
Innovation Solution
The device removes the inorganic film from the bending area and uses an organic layer covering the routing line, with a structured substrate design that includes a neutral plane to minimize stress and prevent cracking, allowing for extreme bending without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the bending level is increased to achieve a narrower bezel, then the bezel size is reduced, but the inorganic film breaks due to stress and cracks occur in the routing line
Solution Approach 1:
The inorganic film is completely removed from the bending area, extracting the problematic component that causes breaking under stress. This allows the routing line to be protected solely by the flexible organic layer, enabling extreme bending without cracking while maintaining narrow bezel size.
Solution Approach 2:
The device structure is differentiated between the display area (with inorganic film) and the bending area (without inorganic film). The bending area has specialized local properties with only organic layers and routing lines, optimized for flexibility and stress resistance, while the display area maintains its original structure for display functionality.
2Device complexity
If an inorganic film is present in the bending area, then the device structure is more complete, but the inorganic film is vulnerable to stress and breaks during bending
Solution Approach 1:
Different structural configurations are applied to different areas: the display area contains the complete device structure including inorganic films for display functionality, while the bending area has a simplified structure with only organic layers and routing lines, optimized for flexibility and stress resistance during bending operations.
Solution Approach 2:
The inorganic film is extracted from the bending area specifically, removing the component that creates the strength-reliability conflict. This selective removal allows the bending area to achieve high stress resistance while the display area maintains its complete structure for proper device functionality.
Data Source
AI summary
An organic light emitting display device is disclosed, which removes an inorganic film from a bending area and minimizes a crack of a routing line to enable an extreme bending. The organic light emitting display device comprises a substrate having a display area and a bending area; a display assembly provided on a display area of the substrate; a routing line arranged on the bending area of the substrate and connected to the display assembly; and an organic layer provided on the bending area of the substrate, covering the routing line, wherein the bending area of the substrate has only the routing line and the organic layer.