OLED Auxiliary Electrode Via Structure for Low-Resistance Cathode Connection
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Solution Overview
Problem
In the manufacturing of large-sized OLED and QLED panels, the organic material or quantum dot light-emitting layer separates the cathode from the auxiliary electrode, disrupting the electrical connection and leading to a significant voltage drop due to high resistance in the second electrode.
Innovation Solution
The electroluminescent diode array substrate incorporates a structural design for the auxiliary electrode that ensures electrical connection with the second electrode through a via hole structure and a conductive polymer layer, reducing the resistance of the second electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the organic material or quantum dot light-emitting layer is used to separate the cathode from the auxiliary electrode, then the light-emitting function is achieved, but the electrical connection between the cathode and auxiliary electrode is disrupted, leading to high resistance and significant voltage drop
Solution Approach 1:
The via hole structure is segmented into multiple sections: a first section extending from the pixel definition layer through the planarization layer, and a second section extending from the first section to the auxiliary electrode. This segmentation allows the light-emitting layer to occupy the first section while maintaining electrical connection through the second section, thus resolving the contradiction between light emission and electrical connectivity.
Solution Approach 2:
The via hole structure acts as an intermediary element between the light-emitting layer and the auxiliary electrode. It provides a dedicated electrical pathway that bypasses the insulating light-emitting material, enabling the cathode to remain electrically connected to the auxiliary electrode while still allowing the light-emitting layer to function in the pixel region.
2Reliability
If the via hole structure is extended deeper to ensure electrical connection, then the electrical connection is improved, but the manufacturing complexity and difficulty increase
Solution Approach 1:
The via hole structure is divided into two distinct sections with different functions: the first section serves as the pixel opening for light emission, while the second section serves as the electrical connection pathway. This segmentation simplifies the manufacturing process by allowing each section to be optimized independently, reducing overall complexity while ensuring reliable electrical connection.
3Reliability
If the auxiliary electrode is positioned closer to the pixel definition layer, then the electrical connection path is shortened reducing resistance, but the risk of short circuit with the light-emitting layer increases
Solution Approach 1:
The via hole structure serves as an intermediary that bridges the gap between the pixel definition layer and the auxiliary electrode. By routing the electrical connection through this dedicated pathway rather than placing the auxiliary electrode directly adjacent to the pixel definition layer, the design shortens the connection path and reduces resistance while maintaining safe separation to prevent short circuits.
Data Source
AI summary
An electroluminescent diode array substrate, a method of manufacturing the electroluminescent diode array substrate and a display panel are provided. The electroluminescent diode array substrate includes: a base substrate; and an auxiliary electrode, a pixel definition layer, a first electrode, a functional layer and a second electrode disposed on the base substrate, the pixel definition layer is provided with a via hole structure, the auxiliary electrode is disposed on at least one side of the via hole structure, and the second electrode is electrically connected with the auxiliary electrode. The electroluminescent diode array further comprises a planarization layer disposed between the base substrate and the pixel definition layer, and a conductive polymer layer. The via hole structure extends from the pixel definition layer and penetrates through the planarization layer, the auxiliary electrode comprises an embedment part embedded in the planarization layer.