Electro-optical Device Connecting Section Vertical Design
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Solution Overview
Problem
Existing organic electroluminescence (EL) devices face challenges in maintaining emission lifetime due to moisture and gas absorption, which complicates the sealing structure, making it difficult to reduce the width of the frame region while ensuring stable electrical connections and gas barrier effectiveness.
Innovation Solution
The electro-optical device incorporates a partition wall portion and a connecting section that electrically connects the second electrode to a connecting line without overlapping, using a conductive material with lower specific resistance, and is covered by a gas barrier layer to prevent moisture ingress, allowing for a narrower frame region and stable electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connecting line and second electrode are directly connected to ensure stable electrical connection, then the electrical connection reliability is improved, but the frame region width must be increased to accommodate the connection structure
Solution Approach 1:
The connecting section extends in the vertical direction (thickness direction) from the connecting line to the second electrode, rather than requiring horizontal overlap in the planar view. This dimensional transition allows electrical connection without increasing the frame region width in the planar configuration.
Solution Approach 2:
The connecting section acts as an intermediary structure that bridges the connecting line and the second electrode. It provides a stable electrical connection path while being positioned such that it does not require the connecting line and second electrode to overlap in the planar view, thus reducing the frame region width.
2Length of stationary object
If the frame region width is reduced to make the device more compact, then the device size is decreased, but it becomes difficult to ensure stable electrical connections between the connecting line and second electrode
Solution Approach 1:
By utilizing the vertical dimension (thickness direction) for the connecting section, the patent achieves stable electrical connection without requiring sufficient horizontal space for overlap. This allows the frame region width to be reduced while maintaining connection stability.
3Ease of manufacture
If the connecting line and second electrode overlap in the planar view to ensure connection, then the electrical connection is simplified, but the manufacturing precision requirement increases due to arrangement accuracy issues
Solution Approach 1:
The connecting section serves as a mediator that connects the connecting line and second electrode through the vertical dimension. This structure reduces the sensitivity to planar arrangement accuracy because the connecting section can be designed to extend from the connecting line upward to contact the second electrode, providing tolerance for positional variations.
4Duration of action of stationary object
If a gas barrier layer is added to prevent moisture ingress, then the emission lifetime is improved, but the device structure becomes more complex
Solution Approach 1:
The gas barrier layer is integrated to cover multiple components (second electrode, connecting section, and partition wall portion) simultaneously, providing moisture prevention for all these elements through a single structural layer rather than requiring separate sealing structures for each component.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the emission lifetime of the organic EL device by preventing moisture and gas entry while reducing the frame region's width, achieving a more compact and efficient electro-optical device design.
Implementation Method 1
a gas barrier layer that covers the second electrode and the connecting section
Data Source
AI summary
An electro-optical device includes: a pixel region that is formed on a substrate and in which a light emitting element that has a first electrode, a second electrode and a light emitting layer formed between the first electrode and the second electrode is arranged; a partition wall portion that is formed above the substrate and located on an outer side of the pixel region; a connecting line that is formed above the substrate and located on an outer side of the partition wall portion; and a connecting section that is formed above the substrate and electrically connects the second electrode to the connecting line, wherein the second electrode covers and extends over the pixel region and the partition wall portion and does not overlap the connecting line in a planar view.