Auxiliary Electrode for OLED Display Unit
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Solution Overview
Problem
In organic light emitting display units, the second electrode's thinness for improved light extraction efficiency leads to increased resistance, causing voltage drops and potentially discontinuous electrodes, which disrupt the electric connection with auxiliary electrodes, resulting in decreased display quality and yield.
Innovation Solution
Incorporating a conductive electron transfer layer between the organic light emitting elements' second electrode and auxiliary electrode, ensuring continuous electric connection even if the second electrode becomes discontinuous, thereby stabilizing the connection and improving yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the second electrode thickness is reduced to improve light extraction efficiency, then light extraction efficiency is improved, but the resistance value of the second electrode increases and the electrode becomes discontinuous at opening portions
Solution Approach 1:
The patent introduces an auxiliary electrode as an intermediary component to establish an alternative electrical connection path. When the second electrode becomes discontinuous at opening portions, the auxiliary electrode provides a mediating conductive path through the opening, ensuring continuous electrical connection between the first electrode and the common electrode, thus resolving the contradiction between thin electrode design and connection reliability
Solution Approach 2:
The patent changes the electrical connection parameters by introducing an additional connection path through the auxiliary electrode. This allows the system to maintain reliable electrical connection even when the original second electrode path is disrupted, effectively changing the connection topology from a single path to a redundant multi-path system
2Illumination intensity
If the second electrode thickness is reduced, then light extraction efficiency is improved, but voltage drop increases due to increased resistance
Solution Approach 1:
The patent segments the electrical connection path into multiple independent routes: the original second electrode path and the auxiliary electrode path. This segmentation allows current to be distributed across multiple parallel paths, reducing the overall resistance and minimizing voltage drop while maintaining the thin second electrode for optimal light extraction
3Illumination intensity
If the second electrode is made thin for improved light extraction, then light extraction efficiency is improved, but the electrode is likely to be discontinuous at opening portions in the insulating film
Solution Approach 1:
The patent implements a preventive design by providing the auxiliary electrode in advance as a backup connection path. This prior cushioning ensures that even if the thin second electrode becomes discontinuous during manufacturing or operation, the auxiliary electrode is already in place to maintain electrical connection, thus compensating for the inherent discontinuity risk of thin electrodes
Data Source
AI summary
A display unit includes: an organic light emitting element including a first electrode, an organic layer, and a second electrode in order, the organic layer including a conductive layer; and an auxiliary electrode configured to be electrically connected to the second electrode via the conductive layer in the organic layer.