Flexible OLED Silicon Nitride Island Patterning
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Solution Overview
Problem
The silicon nitride (SiNx) layer in flexible organic electroluminescent devices is prone to cracking during the bending process, which compromises the device's banding property.
Innovation Solution
The silicon nitride layer is patterned into island patterns above the active layer of the thin film transistor but under the planarization film, enhancing the device's flexibility and reducing stress during the bending process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous silicon nitride layer is formed above the active layer, then the device provides adequate insulation and protection, but the layer is prone to cracking during the bending process
Solution Approach 1:
The continuous silicon nitride layer is divided into separate island patterns that are spaced apart from each other. This segmentation allows the layer to flex during bending without creating continuous stress paths that would lead to cracking, while still providing insulation and protection where needed.
Solution Approach 2:
The silicon nitride layer is applied selectively in island patterns only in specific regions above the active layer, rather than as a continuous uniform layer. This local application provides protection and insulation only where required, reducing overall stress accumulation while maintaining device reliability.
2Reliability
If the silicon nitride layer is patterned into island patterns, then the banding property is enhanced by reducing stress, but the manufacturing process becomes more complex
Solution Approach 1:
The silicon nitride layer is formed as separate island patterns using standard photolithography and etching techniques. These island patterns can be defined by simple geometric shapes that align with existing device features, making the segmentation achievable through conventional manufacturing processes without requiring complex tooling or multiple fabrication steps.
Data Source
AI summary
A flexible organic electroluminescent device is disclosed which includes: a flexible substrate; a buffer layer entirely formed on the flexible substrate; a thin film transistor formed on the buffer layer and configured to include an active layer; a planarization film formed to cover the thin film transistor; an organic light emitting diode formed on the planarization film and configured to include a first electrode, an organic emission layer and a second electrode; and at least one silicon nitride layer formed above the active layer of the thin film transistor but under the planarization film and patterned into a plurality of island patterns.