OLED Wire Trace Separation Structure for Narrow-Bezel Cutting
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Solution Overview
Problem
The challenge of achieving narrow bezels in display devices is hindered by components like test pads that are removed during the cutting process, exposing wire traces and leading to corrosion, electric erosion, and transmission of impacts into the display panel.
Innovation Solution
A wire trace structure is implemented with a separation area that separates the exposed portion from the connected portion of the wire trace, using a connection wire and insulating layers to prevent corrosion and impact transmission, and includes an organic protective layer to insulate and protect the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If test pads are removed in the cutting process to achieve narrow bezel, then the bezel width is reduced, but wire traces become exposed to outside causing corrosion and electric erosion
Solution Approach 1:
The wire trace is divided into two separate portions: a first portion extending from the pad toward the active area, and a second portion extending to the end portion of the substrate. This segmentation prevents continuous exposure of the wire trace to the outside environment while maintaining electrical connectivity through the connection wire.
Solution Approach 2:
A connection wire is introduced as an intermediary element to electrically connect the first and second portions of the wire trace. This connection wire is positioned and configured to prevent direct exposure of the main wire trace to external corrosive environments while maintaining electrical functionality.
2Length of moving object
If test pads are removed in the cutting process to achieve narrow bezel, then the bezel width is reduced, but impacts during cutting are transmitted along the wire trace into the display panel
Solution Approach 1:
By segmenting the wire trace into separate portions with gaps between them, the continuous transmission path for mechanical impacts is interrupted. The connection wire provides electrical connectivity while the segmented structure prevents mechanical impact propagation from the cutting area into the active display area.
Solution Approach 2:
The connection wire serves as a mediator that provides electrical connectivity while physically isolating the wire trace segments. This intermediary structure allows electrical signals to pass while blocking the transmission of mechanical impacts that would otherwise travel along the continuous wire trace.
3Reliability
If wire traces are exposed to outside after cutting to maintain electrical connectivity, then electrical functionality is maintained, but corrosion and electric erosion occur along the wire trace
Solution Approach 1:
The wire trace is segmented into portions that are not continuously exposed to the external environment. The first portion remains protected within the substrate structure, while only necessary connection points are accessible, reducing the surface area vulnerable to corrosion and electric erosion.
Solution Approach 2:
The connection wire acts as a protected intermediary that establishes electrical connectivity between wire trace portions without requiring the main wire trace to be exposed to external environments, thereby preventing corrosion and electric erosion while maintaining electrical functionality.
Data Source
AI summary
The present disclosure relates to an organic light emitting diode display device, and particularly, is characterized in that when wire traces are exposed while a substrate on which a plurality of display panels are formed is cut into unit panels by a cutting process, the wire traces include a separation area to prevent corrosion and electric erosion of a conductive wire trace from propagating through the exposed wire traces and to resolve a defect in which delamination of an inorganic layer occurs in a cutting process.