OLED Auxiliary Electrode Grid Reduces Resistance
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Solution Overview
Problem
Organic light emitting display (OLED) devices face challenges in achieving improved transmittance for external light due to high electrical resistance in their electrode structures, which affects the overall performance and efficiency of the devices.
Innovation Solution
The OLED device incorporates a substrate with a first electrode, an organic light emitting layer, and an auxiliary electrode, where the auxiliary electrode includes a conductive layer and a conductive pattern with a grid arrangement, reducing electrical resistance and minimizing transmittance degradation. The conductive layer and first electrode share the same material, and the conductive pattern is made of low resistivity materials like graphene or PEDOT:PSS, with a specific wire arrangement to optimize electrical connectivity and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrode structure is used in OLED devices, then the manufacturing process is simple, but the electrical resistance is high which degrades device performance
Solution Approach 1:
The electrode structure is segmented into multiple functional layers: a first electrode layer, an auxiliary electrode layer, and a conductive pattern layer. This segmentation allows each layer to perform specific functions - the first electrode provides basic conductivity, the auxiliary electrode reduces resistance in specific regions, and the conductive pattern creates low-resistance pathways, thereby reducing overall electrical resistance while maintaining manufacturing feasibility through standardized layer-by-layer processing.
Solution Approach 2:
The electrode structure employs composite materials combining different conductive materials with complementary properties. The auxiliary electrode and conductive pattern use materials specifically selected for their low resistivity characteristics, while the first electrode uses conventional transparent conductive materials. This composite approach optimizes the overall electrical resistance without requiring complete redesign of the entire electrode system.
2Illumination intensity
If the transmittance for external light is improved, then the display performance is enhanced, but the electrical resistance increases which affects device efficiency
Solution Approach 1:
The electrode structure implements local quality by concentrating the low-resistance conductive pattern in specific regions where high current density is required, such as near the pixel electrodes and data lines. The auxiliary electrode is strategically positioned to provide localized resistance reduction without covering the entire display area, thereby maintaining high transmittance in regions where conductivity enhancement is not critical while reducing resistance where it matters most for device efficiency.
Data Source
AI summary
An organic light emitting display device includes a substrate including a plurality of pixel areas, each of the plurality of pixel areas including a light emitting region and a transmission region, a first electrode disposed on the light emitting region of the substrate, a second electrode opposing the first electrode, an organic light emitting layer which is disposed on the light emitting region of the substrate and disposed between the first electrode and the second electrode, and an auxiliary electrode which is disposed on the transmission region of the substrate and electrically connected to the second electrode.