Reducing Short Circuits in OLED Devices with Composite Layers
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Summary
Problems
OLED devices are prone to short circuits due to particle contamination or scratches, leading to non-emitting or dim pixels, which existing short reduction layers fail to adequately address without impairing current flow or increasing operating voltage.
Innovation solutions
A short reduction layer comprising a mixture of ZnS, SiO2, and ITO with an In to Zn atomic ratio between 0.90 and 2.37 is introduced between the organic electroluminescent medium and the electrodes to reduce leakage current and maintain efficient current flow.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a short reduction layer is introduced to reduce leakage current through particle contamination or scratches, then the robustness against shorting defects is improved, but the operating voltage increases and current flow is impaired
Why choose this principle:
The patent applies composite materials by combining multiple materials (metal oxides, fluorides, sulfides, or organic materials) in the short reduction layer to achieve the desired electrical resistivity while maintaining appropriate current flow. This composite approach allows optimization of both short reduction capability and electrical performance without relying on a single material's limitations.
Principle concept:
If a short reduction layer is introduced to reduce leakage current through particle contamination or scratches, then the robustness against shorting defects is improved, but the operating voltage increases and current flow is impaired
Why choose this principle:
The patent employs parameter changes by adjusting the electrical resistivity and thickness of the short reduction layer to optimize its performance. By carefully controlling these parameters, the layer can effectively reduce leakage current through shorts while minimizing the impact on normal current flow and operating voltage.
Application Domain
Data Source
AI summary:
A short reduction layer comprising a mixture of ZnS, SiO2, and ITO with an In to Zn atomic ratio between 0.90 and 2.37 is introduced between the organic electroluminescent medium and the electrodes to reduce leakage current and maintain efficient current flow.
Abstract
In an OLED device having a substrate, a first electrode layer disposed over the substrate, an inorganic short reduction layer disposed over the first electrode layer, an organic electroluminescent medium disposed over the short reduction layer, and a second electrode layer over the electroluminescent medium, a feature is the inclusion of a mixture of ZnS, SiO 2 , and ITO in the short reduction layer wherein the ratio of In atoms to Zn atoms is in the range of from 0.90 to 2.37.