OLED Auxiliary Electrode Connection via Penetrating Conductive Member
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Solution Overview
Problem
Organic light emitting display devices face challenges in reducing the surface resistance of the second electrode while maintaining a thin thickness, which affects the display quality due to increased electric resistance, leading to potential voltage drop and decreased conductivity.
Innovation Solution
Incorporating a connection member that penetrates through the second electrode layer and organic layer to electrically connect with an auxiliary electrode, reducing surface resistance and improving display quality without the need for a contact hole, and simplifying the manufacturing process by using a conductive ball with a spherical shape that contacts the auxiliary electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the second electrode layer is made thin to improve light emission, then the light transmission is improved, but the surface resistance increases leading to voltage drop and decreased display quality
Solution Approach 1:
The patent divides the electrode system into multiple components: the second electrode layer and a separate auxiliary electrode layer connected via connection members. This segmentation allows the second electrode layer to remain thin for light transmission while the auxiliary electrode provides additional conductive pathways to maintain low surface resistance.
Solution Approach 2:
The patent introduces connection members that extend in the vertical dimension to connect the auxiliary electrode to the second electrode layer. This dimensional approach allows electrical connection without increasing the planar thickness of the light-emitting structure, maintaining light transmission while reducing resistance.
2Reliability
If a contact hole is formed to connect the auxiliary electrode, then the electrical connection is achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The connection members are designed to automatically penetrate through the organic layer and contact the auxiliary electrode through application of pressure, without requiring pre-formed contact holes. The system self-assembles the electrical connection through mechanical pressure, simplifying the manufacturing process.
Solution Approach 2:
The connection members are pre-positioned on the second electrode layer before the organic layer is fully formed. This preliminary placement allows the connection to be established simply by applying pressure later, avoiding the need for complex contact hole formation processes.
Data Source
AI summary
An organic light emitting display device includes a first substrate, a first electrode layer including a plurality of first electrodes and an auxiliary electrode on the first substrate, the auxiliary electrode being spaced apart from the first electrodes in a plan view, an organic layer on the first electrode layer, the organic layer overlapping the first electrodes of the first electrode layer, a second electrode layer on the first electrode layer, the second electrode layer overlapping the first electrodes and the auxiliary electrode of the first electrode layer, a second substrate on the second electrode layer, and a connection member penetrating through the second electrode layer and through the organic layer to electrically connect the second electrode layer and the auxiliary electrode, the connection member contacting the second substrate.