OLED Cathode Voltage Drop Reduction via Auxiliary Electrode Opening
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Solution Overview
Problem
Existing organic light-emitting display devices face challenges in efficiently forming openings in the organic layer without using masks or etching processes, which complicates the manufacturing process and can lead to voltage drops due to high cathode resistance, resulting in luminance inconsistencies across pixels.
Innovation Solution
A method involving the formation of a plurality of anodes and an auxiliary electrode on a substrate, where an opening is created in the organic layer by applying a voltage to the auxiliary electrode, exposing it and allowing the cathode to be electrically connected, thereby reducing voltage drops and simplifying the manufacturing process by eliminating the need for masks and etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If masks and etching processes are used to form openings in the organic layer, then the openings can be precisely formed, but the manufacturing process complexity increases
Solution Approach 1:
The patent extracts and eliminates the mask and etching processes from the manufacturing workflow. Instead of using these complex processes to form openings, the invention forms the cathode layer continuously over the organic layer, then selectively removes portions of the cathode layer to expose the auxiliary electrode, thereby achieving the same result without the complexity of masks and etching.
Solution Approach 2:
The patent inverts the conventional approach by not forming openings in the organic layer first, but instead forming the cathode layer completely and then selectively removing cathode portions. This reverse sequence simplifies the manufacturing process while achieving the desired electrical connection between the cathode and auxiliary electrode.
2Ease of manufacture
If high cathode resistance is present, then the manufacturing process is simpler, but voltage drops occur causing luminance inconsistencies
Solution Approach 1:
The patent applies local quality by creating selective electrical connection paths. The cathode layer is removed only in specific regions where auxiliary electrodes are located, establishing low-resistance electrical connections only where needed. This localized approach ensures uniform voltage distribution and consistent luminance across different pixels while maintaining manufacturing simplicity.
Solution Approach 2:
The auxiliary electrode acts as an intermediary element that mediates the electrical connection between the cathode and the organic light-emitting layer. By forming openings that expose the auxiliary electrode, the patent creates an intermediate conductive path that reduces overall cathode resistance and ensures uniform voltage distribution, thereby improving luminance consistency.
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 approach simplifies the manufacturing of organic light-emitting display devices by reducing the complexity of forming openings and minimizing voltage drops across pixels, leading to more consistent luminance and improved efficiency in light emission.
Implementation Method 1
an opening is formed in the organic layer by applying a voltage to the auxiliary electrode
Implementation Method 2
an opening is formed in the organic layer by applying a voltage to the auxiliary electrode. The opening exposes the auxiliary electrode
Data Source
AI summary
A method of manufacturing an organic light-emitting display device is provided. A plurality of anodes and an auxiliary electrode are formed on a substrate. The auxiliary electrode is separated from the plurality of the anodes. An organic layer is formed on the plurality of the anodes and the auxiliary electrode. An opening is formed in the organic layer by applying a voltage to the auxiliary electrode. The opening exposes the auxiliary electrode. A cathode is formed on the organic layer and the exposed auxiliary electrode. The cathode is electrically connected to the exposed auxiliary electrode.