OLED Display Power Bus Segmentation to Reduce Resistance
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Solution Overview
Problem
Large-sized OLED display devices experience increased electrical resistance in common and driving power bus lines, leading to power loss and reduced light efficiency and display quality due to the increased size of these lines.
Innovation Solution
The implementation of a connection wire made of the same material as the second electrode, physically and electrically separated from it, and a dummy layer to minimize electrical resistance by reducing the overall resistance of the common and driving power bus lines, along with auxiliary layers and a groove structure to enhance contact and reduce power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of OLED display device is increased, then the display area is enlarged, but the electrical resistance of common and driving power bus lines increases leading to power loss
Solution Approach 1:
The patent introduces a connection wire structure that segments the power supply path into multiple sections. The connection wire is disposed on the common power bus line and physically separated from the second electrode, creating intermediate connection points that reduce the overall resistance of the power bus lines in large-sized OLED display devices
Solution Approach 2:
The connection wire acts as an intermediary element between the common power bus line and the second electrode. This intermediary structure provides additional electrical connection paths that reduce power loss without requiring changes to the overall device size or additional fabrication processes
2Loss of energy
If the electrical resistance of power bus lines is reduced to minimize power loss, then light efficiency is enhanced, but the device complexity increases due to additional connection wires and dummy layers
Solution Approach 1:
The connection wire is made of the same material as the second electrode, ensuring homogeneous material properties and simplifying the manufacturing process. This approach reduces power loss while maintaining structural simplicity and avoiding additional material deposition steps
Solution Approach 2:
The dummy layer is designed as a simple, easily fabricable structure that can be formed using existing manufacturing processes. Although it adds a layer to the device, it uses standard materials and processes, making the added complexity minimal and cost-effective
Data Source
AI summary
An OLED display device includes a substrate; an organic light emitting element having a first electrode formed on the substrate, an organic emission layer disposed on the first electrode, and a second electrode disposed on the organic emission layer; a common power bus line disposed between the organic light emitting element and an edge of the substrate on the substrate and electrically connected with the first electrode; a driving power bus line neighboring the common power bus line on the substrate, disposed between the organic light emitting element and the edge of the substrate, and electrically connected with the second electrode extended from a portion corresponding to the organic emission layer; and a connection wire made of the same material as the second electrode on the common power bus line, separated from the second electrode, and electrically connected with the common power bus line.