Organic Light Emitting Display Auxiliary Electrode Partition Wall
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Solution Overview
Problem
The top emission type organic light emitting display apparatus faces challenges in depositing the organic emission layer and connecting the auxiliary electrode to the cathode electrode, leading to defective driving between pixels due to the high resistance of the cathode electrode and the need for additional processes.
Innovation Solution
A partition wall is formed to stabilize the connection between the auxiliary electrode and the cathode electrode, allowing for blanket deposition of the organic emission layer without the need for additional contact holes, thereby preventing defects and reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cathode electrode is formed of a transparent conductive material to enable light transmission in top emission type, then light emission is achieved, but the resistance of the cathode electrode increases
Solution Approach 1:
The patent combines the transparent cathode electrode with an auxiliary electrode to create a composite electrode structure. The auxiliary electrode provides additional conductive pathways, reducing the overall resistance while the transparent cathode electrode maintains light transmission capability.
Solution Approach 2:
The auxiliary electrode acts as an intermediary element that connects to the transparent cathode electrode through contact holes. This intermediary structure provides alternative current paths, reducing the resistance burden on the transparent cathode electrode material.
2Ease of manufacture
If blanket deposition of the organic emission layer is performed, then manufacturing complexity is reduced, but the auxiliary electrode cannot be connected to the cathode electrode
Solution Approach 1:
The patent performs preliminary patterning of the auxiliary electrode and creation of contact holes before blanket deposition of the organic emission layer. This preliminary action ensures that electrical connection paths are established before the organic layer is deposited, allowing subsequent blanket deposition without compromising connectivity.
Solution Approach 2:
The patent segments the auxiliary electrode into multiple regions, with certain areas left exposed or patterned to create contact regions. This segmentation allows the organic emission layer to be blanket-deposited while maintaining electrical connection pathways through the segmented auxiliary electrode structure.
3Ease of manufacture
If the organic emission layer is not patterned to be separated in each pixel, then manufacturing complexity is reduced, but defective driving can occur
Solution Approach 1:
The patent applies local quality by creating specific contact hole regions in the auxiliary electrode where electrical connections are needed, while leaving the organic emission layer unpatterned in other areas. This localized patterning approach ensures proper pixel isolation and driving while minimizing overall manufacturing complexity.
Solution Approach 2:
The patent uses the patterned auxiliary electrode and contact holes as a template or copying structure to define pixel boundaries and connection points. This copying approach allows the organic emission layer to be blanket-deposited while the underlying auxiliary electrode pattern ensures proper pixel separation and driving.
Data Source
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AI summary
Disclosed is an organic light emitting display apparatus (Fig. 2). The organic light emitting display apparatus includes a plurality of anode electrodes (180) disposed on a substrate (100), an auxiliary electrode (190) disposed on the substrate (100), an organic emission layer (240) disposed on the anode electrode (180), a cathode electrode (250) disposed on the organic emission layer (240), an insulating bank (220) disposed to overlap a first portion of the auxiliary electrode (190) and to expose a second portion of the auxiliary electrode (190), and a partition wall (230) disposed above the exposed second portion of the auxiliary electrode (190), the partition wall (230) covering the exposed second portion while leaving a separation space between the partition wall (230) and the bank (220), the cathode electrode (250) being electrically connected to the auxiliary electrode (190) through the separation space between the partition wall (230) and the bank (220). The partition wall (230) comprises a first partition wall (231) disposed on the auxiliary electrode (190) and a second partition wall (232) disposed on the first partition wall (231). The second partition wall (232) is supported by the first partition wall (231) and the bank (220).