OLED Array Substrate Auxiliary Electrode Integration
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Solution Overview
Problem
In large-size OLED display devices, the high resistivity of the second electrode leads to uneven brightness due to a significant voltage drop, resulting in suboptimal display effects, and the addition of an auxiliary electrode to reduce resistance increases production costs and may reduce light transmittance if made of metal materials or not effectively reduce resistance if made of metal oxide semiconductors.
Innovation Solution
The auxiliary electrode is disposed in the same layer as the first electrode, gate electrode, and drain electrode, connected in parallel through via holes to reduce the second electrode's resistance without additional process steps, and can be formed as a double-layer or triple-layer structure with metal and transparent conductive materials to enhance light blocking and prevent leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an auxiliary electrode is added to reduce the resistance of the second electrode, then the brightness uniformity is improved, but the production cost increases and the device complexity increases
Solution Approach 1:
The auxiliary electrode is merged with the gate electrode or drain electrode by disposing them in the same layer and forming them through the same patterning process. This integration allows the auxiliary electrode to reduce resistance and improve brightness uniformity without adding separate process steps, thereby avoiding increased device complexity and production cost
Solution Approach 2:
The gate electrode or drain electrode is given an additional function by disposing the auxiliary electrode in the same layer. This multi-functional design allows the same structural layer to serve both as a control/electrode element and as a resistance-reducing auxiliary electrode, eliminating the need for additional components
2Illumination intensity
If an auxiliary electrode is added to reduce the resistance of the second electrode, then the brightness uniformity is improved, but the production cost increases
Solution Approach 1:
The auxiliary electrode is formed in the same layer as the gate electrode or drain electrode through the same patterning process, merging the formation steps into one. This eliminates the need for additional deposition and patterning steps that would increase production cost, while still achieving the resistance reduction and brightness uniformity improvement
3Reliability
If metal materials are used for the auxiliary electrode to reduce resistance, then the resistance is reduced, but the light transmittance is reduced
Solution Approach 1:
The auxiliary electrode is disposed in the same layer as the gate electrode or drain electrode, utilizing the local structural arrangement to achieve resistance reduction without requiring metal materials that would block light. The same-layer configuration allows the auxiliary electrode to function effectively while maintaining the transparency characteristics of the original electrode layer
Data Source
AI summary
An organic light-emitting diode (OLED) array substrate, a method for manufacturing an organic light-emitting diode (OLED) array substrate and a display apparatus are provided, and the OLED array substrate includes: a base substrate; a driving transistor, a first electrode, a second electrode, an organic material functional layer, and an auxiliary electrode connected to the second electrode disposed on the base substrate; and the driving transistor includes a gate electrode, a source electrode and a drain electrode, and the first electrode is electrically connected with the source electrode or the drain electrode; the auxiliary electrode is disposed in a same layer as at least one of the first electrode, the gate electrode, and the drain electrode.