OLED Display Edge Structure With Dummy Organic Moisture Barrier
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Solution Overview
Problem
Existing display devices face issues with moisture permeation, which degrade reliability and lifespan, particularly in areas where the organic light emitting layer extends to the non-active area, creating pathways for moisture ingress.
Innovation Solution
The implementation of dummy organic patterns and an air gap between conductive patterns in the non-active area, along with an undercut structure, to block moisture permeation paths and separate the organic light emitting layer from the side surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the organic light emitting layer is extended to the non-active area, then the display device can be manufactured with simpler processes, but moisture permeation paths are created that degrade reliability and lifespan
Solution Approach 1:
The patent divides the non-active area into multiple segments by forming dummy organic patterns (first, second, third dummy patterns) that create separate regions. These segmented patterns interrupt the continuous organic light emitting layer, thereby blocking moisture permeation paths while maintaining manufacturing simplicity. The segmentation principle directly resolves the contradiction by creating discontinuities in the organic layer without requiring complex additional manufacturing steps.
Solution Approach 2:
The patent introduces an intermediary structure - the dummy organic patterns - that acts as a barrier between the active area and the external environment. These dummy patterns serve as mediator elements that block moisture permeation while being formed using the same manufacturing process as the functional organic light emitting layer, thus maintaining ease of manufacture while improving reliability.
2Productivity
If the organic light emitting layer is continuous across the substrate, then the manufacturing process is simpler, but moisture can permeate through the side surfaces to the active area
Solution Approach 1:
The continuous organic light emitting layer is segmented by introducing dummy organic patterns in the non-active area. These patterns create intentional discontinuities that block moisture permeation paths from side surfaces to the active area, while the overall manufacturing process remains efficient as the dummy patterns are formed simultaneously with the functional organic layer in the same manufacturing step.
Solution Approach 2:
The patent applies local quality by differentiating the structure in the non-active area from the active area. The dummy organic patterns are selectively formed only in the non-active area to provide moisture blocking functionality where needed, while maintaining the continuous structure in the active area for optimal display performance. This localized modification improves moisture resistance without affecting manufacturing efficiency.
3Adaptability or versatility
If the organic light emitting layer extends to the edges of the active area, then device integration is improved, but moisture permeation paths are created that reduce lifespan
Solution Approach 1:
The patent segments the organic light emitting layer structure by forming dummy organic patterns at the boundaries of the active area. These segmented patterns maintain good device integration by allowing the organic layer to extend close to the edges while creating moisture-blocking barriers that prevent permeation paths, thereby extending device lifespan without compromising integration.
Solution Approach 2:
The dummy organic patterns are formed in advance during the same manufacturing process step as the functional organic light emitting layer. This preliminary action of creating moisture barriers before device assembly ensures that moisture permeation paths are blocked from the outset, extending device lifespan while maintaining the integrated structure needed for versatile device applications.
Data Source
AI summary
A display device includes a substrate including an active area and a non-active area which encloses the active area, a transistor on the substrate in the active area, a planarizing layer on the substrate and the transistor in the active area and the non-active area, a light emitting diode which is on the planarizing layer in the active area and includes an anode, an organic light emitting layer, and a cathode, a first conductive pattern on the planarizing layer in the non-active area, a second conductive pattern on the first conductive pattern in the non-active area and a plurality of dummy organic patterns which is disposed between the first conductive pattern and the second conductive pattern and is formed of the same material as the organic light emitting layer, wherein an air gap is disposed between the plurality of dummy organic patterns.