OLED Power Interconnection Structure Prevents Film Separation
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Solution Overview
Problem
In organic light-emitting display apparatuses, film-separation often occurs at the contact portion of the opposite electrode connected to the power interconnection line, leading to unstable power connections and defective products due to the formation of steps caused by insulating layers between interconnection layers.
Innovation Solution
The organic light-emitting display apparatus features a power interconnection line composed of first and second interconnection layers stacked without an insulating layer, with a second insulating layer filling the interval between the power interconnection line and the opposite electrode, ensuring a stable contact and preventing film-separation by eliminating steps and increasing the contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating layer is formed between interconnection layers, then electrical insulation is provided, but steps are formed causing film-separation and unstable power connections
Solution Approach 1:
The insulating layer is removed from between the first and second interconnection layers in the opposite electrode contact portion, extracting the problematic element that causes step formation and film-separation, while maintaining insulation elsewhere in the device
Solution Approach 2:
The structure is made non-uniform by applying different configurations to different regions: the interconnection layers are directly connected in the opposite electrode contact portion to prevent film-separation, while insulating layers are maintained in other regions for electrical insulation
2Reliability
If a second insulating layer is added to fill intervals, then contact area is increased and film-separation is prevented, but device complexity increases
Solution Approach 1:
The second insulating layer acts as an intermediary substance that fills the interval between the power interconnection line and the opposite electrode, providing mechanical support and preventing film-separation while maintaining electrical insulation where needed
Solution Approach 2:
The second insulating layer serves multiple functions simultaneously: it fills structural intervals, prevents film-separation, provides mechanical support, and maintains electrical insulation, combining several protective functions into a single element
Data Source
AI summary
An organic light-emitting apparatus includes a thin film transistor (TFT) including an active layer, a gate electrode, and source and drain electrodes, an organic light-emitting device including a pixel electrode connected to the TFT, an intermediate layer including an emissive layer, and an opposite electrode, an opposite electrode contact portion connecting the opposite electrode to a power interconnection line. The power interconnection line connected to the opposite electrode contact portion includes a first interconnection layer and a second interconnection layer which are stacked without an insulating layer therebetween.