Organic Light-Emitting Device Partition Wall Structure
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Solution Overview
Problem
Conventional organic light-emitting devices face issues with film thickness uniformity and luminance due to protruding portions in the interlayer insulating film, leading to non-uniform organic film formation and potential leakage paths between the anode and cathode, which affect the device's lifespan and performance.
Innovation Solution
The organic light-emitting device features an underlayer with a protruding portion and a partition wall that covers the top surface and a portion of the inclined surface, ensuring the organic film is in contact with both surfaces, preventing localized thin film thickness and uncovered areas, thereby maintaining high film thickness uniformity and excellent light-emitting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a protruding portion is formed in the interlayer insulating film, then the device structure is created, but the organic film loses film thickness uniformity
Solution Approach 1:
The partition wall is formed in advance to cover the protruding portion of the interlayer insulating film before the organic film is deposited. This preliminary structural preparation ensures that the organic film can be uniformly deposited without being affected by the underlying protrusion, thus maintaining film thickness uniformity while preserving the necessary device structure.
Solution Approach 2:
The partition wall acts as an intermediary layer between the protruding interlayer insulating film and the organic film. It mediates the interaction by providing a flat upper surface that receives the organic film, thereby isolating the organic film from the irregular underlying structure and ensuring uniform film thickness.
2Ease of manufacture
If film thickness uniformity is lost, then the device can be manufactured, but luminance concentration occurs and device life decreases
Solution Approach 1:
The partition wall is constructed beforehand to prevent film thickness non-uniformity during the organic film formation process. This preliminary protective structure ensures that the organic film is deposited uniformly, preventing subsequent luminance concentration and extending device operational life while maintaining manufacturability.
Solution Approach 2:
The partition wall serves as a protective cushioning structure that prevents the harmful effect of the protruding portion from affecting the organic film. By providing this protective barrier in advance, the system prevents film thickness variations that would lead to luminance concentration and reduced device reliability.
3Ease of manufacture
If an area without organic film formation occurs, then the device can be manufactured, but a leakage path is formed between anode and cathode
Solution Approach 1:
The partition wall acts as an intermediary protective structure that ensures complete coverage of the organic film by providing a defined boundary and flat surface. This prevents areas without organic film formation that would create leakage paths, thereby maintaining electrical insulation reliability while allowing device manufacturing to proceed.
Solution Approach 2:
The partition wall functions as a confining structure that guides the organic film formation process, ensuring that the thin organic film is deposited uniformly across the intended area without gaps. This prevents the formation of leakage paths while maintaining ease of manufacture.
Data Source
AI summary
An organic light-emitting device includes at least an underlayer, a partition wall, and an organic film. The underlayer is disposed above a substrate. The partition wall covers a first part and surrounds a second part of the surface of the underlayer. The organic film includes organic material, is disposed in a recess formed by the partition wall surrounding the second part, and is in contact with the surface of the underlayer and a surface of the partition wall. The surface of the underlayer has a protruding portion that protrudes in an upward direction. The protruding portion is composed of a top surface and an inclined surface surrounding the top surface. The first part includes least the top surface and a portion of the inclined surface, and an inner edge of the partition wall is in contact with the inclined surface or a level portion of the surface of the underlayer.