Curved Common Power Supply Line for Flat Panel Display
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Solution Overview
Problem
Conventional organic electroluminescent (EL) devices have increased panel size due to the wide wiring of the common power supply line, which is necessary to maintain constant wiring resistance, and this width is not reduced even when the line is also present in the light emitting region.
Innovation Solution
The common power supply line is formed with curved portions in the non-light emitting region, allowing the interlayer insulating layer to be patterned during the etching process without requiring a mask, thereby reducing the wiring width while maintaining typical wiring resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common power supply line is made wide to maintain constant wiring resistance, then the wiring resistance is maintained, but the panel size increases
Solution Approach 1:
The common power supply line is designed with curved portions instead of straight lines. This curvature increases the effective length of the power supply line within the same panel area, allowing the wiring resistance to be maintained while reducing the required width of the line, thus decreasing the overall panel size.
Solution Approach 2:
The patent utilizes the vertical dimension by forming the common power supply line on multiple layers (first common power supply line on the first substrate, second common power supply line on the second substrate). This multi-layer approach allows the power supply function to be distributed across dimensions, reducing the width requirement on any single layer while maintaining overall resistance characteristics.
2Reliability
If the common power supply line is made wide to maintain constant wiring resistance, then the wiring resistance is maintained, but the wiring width increases
Solution Approach 1:
The common power supply line incorporates curved portions that increase its effective path length without increasing its width. The curvature allows the line to traverse a longer distance within the same spatial footprint, maintaining resistance while minimizing width occupation.
Solution Approach 2:
The common power supply line is divided into multiple segments across different layers (first common power supply line and second common power supply line). Each segment carries a portion of the current, allowing the individual line widths to be reduced while the combined system maintains the required resistance characteristics.
3Adaptability or versatility
If the common power supply line is present in both light emitting and non-light emitting regions, then power supply coverage is improved, but the panel size increases
Solution Approach 1:
The curved portions of the common power supply line in the non-light emitting region allow the line to provide power supply coverage across both light emitting and non-light emitting regions while occupying minimal space. The curvature enables the line to reach multiple areas without requiring additional width or area.
Data Source
AI summary
A flat panel display device is disclosed that may include a light-emitting layer portion including a first electrode, a second electrode, and an organic light-emitting layer between the first and second electrodes; at least two thin film transistors for controlling the light-emitting layer portion; a scanning signal line for supplying a scanning signal to the thin film transistor; a data signal line for supplying a data signal to the thin film transistor; a light emitting region having a common power supply line for supplying current to the light-emitting layer portion; and a peripheral common power supply line having at least one curved portion and connected to the common power supply line on a panel of a non-light emitting region except the light emitting region, wherein the common power supply line has a reduced wiring width while maintaining a constant wiring resistance to thereby reduce the total size of the display panel.