OLED Auxiliary Electrode Contact Structure for Lower Resistance
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Solution Overview
Problem
Existing display devices, particularly organic light emitting displays, require improvements in the auxiliary electrode contact portion to enhance electrical connectivity and reduce power consumption.
Innovation Solution
A display device with a patterned auxiliary electrode structure that includes a transparent conductive layer covering an electrode hole, a bank exposing the concave portion, and a cathode electrode directly contacting the inner side surface of this concave portion, along with a reflective layer recessed from the inner side surface of the electrode hole, enhancing electrical connection and reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional auxiliary electrode structure is used, then the device structure is simple, but the electrical connectivity is insufficient and power consumption is high
Solution Approach 1:
The patent introduces a concave portion in the transparent conductive layer that extends vertically downward from the surface, creating a three-dimensional structure. The cathode electrode is positioned within this concave portion to directly contact the auxiliary electrode, establishing an additional electrical connection path that reduces resistance and power consumption while maintaining structural simplicity.
Solution Approach 2:
The transparent conductive layer with a concave portion serves as an intermediary structure that enables direct contact between the cathode electrode and auxiliary electrode. The concave portion acts as a mediator that bridges the gap between these two electrodes, improving electrical connectivity without requiring complex additional components.
2Reliability
If the transparent conductive layer covers the entire auxiliary electrode, then electrical connectivity is improved, but particle generation increases
Solution Approach 1:
The transparent conductive layer is selectively positioned to cover only specific portions of the auxiliary electrode structure. The concave portion provides localized coverage where electrical connectivity is needed, while leaving other areas exposed. This localized approach maintains electrical connectivity without the particle generation issues associated with complete coverage.
3Power
If the cathode electrode directly contacts the auxiliary electrode through the concave portion, then power transfer efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The concave portion is pre-formed in the transparent conductive layer during the manufacturing process, creating a predetermined receptacle for the cathode electrode. This preliminary structuring guides the cathode electrode into the correct position, facilitating direct contact with the auxiliary electrode and improving power transfer efficiency while reducing the stringency of alignment requirements.
Data Source
AI summary
A display device can include a substrate including a light emitting area and an auxiliary electrode contact portion for providing an electrical connection with one or more elements, an auxiliary electrode disposed in the auxiliary electrode contact portion and having an electrode hole, a transparent conductive layer covering the auxiliary electrode and having a concave portion above the electrode hole, at least one bank disposed on the transparent conductive layer and exposing the concave portion and an upper surface of the transparent conductive layer that is adjacent to the concave portion, an organic layer disposed on the at least one bank and the exposed upper surface of the transparent conductive layer, and a cathode electrode disposed on the organic layer and a side surface of the concave portion.