Organic Light Emitting Display Bank Layer Adhesion
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Solution Overview
Problem
The structural characteristics of organic light emitting display devices, particularly the boundary between light emitting and light transmitting units, lead to irregularities and issues due to differences in array layers, affecting transmittance and reliability.
Innovation Solution
Incorporating a passivation layer, planarization layer, cover layer, and bank layer configuration, where the bank layer is attached to the passivation layer through a cover layer to enhance adhesion and prevent detachment, and the cover layer is formed of the same material as the anode's first electrode to ensure proper separation and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the array layer is minimized in the light transmitting unit to increase transmittance, then light transmittance is improved, but irregularities occur at the boundary between light emitting and light transmitting units
Solution Approach 1:
The patent applies different array layer configurations to different regions: the light emitting unit maintains a complete array layer structure for optimal light emission, while the light transmitting unit minimizes the array layer for maximum transmittance. This local differentiation resolves the contradiction by allowing each region to have the structure best suited to its function, while the bank layer ensures a regular boundary between these differently structured regions.
2Adaptability or versatility
If different array layer structures are used in light emitting and light transmitting units, then functional requirements are met, but detachment occurs at the boundary between units
Solution Approach 1:
The bank layer serves as an intermediary structure between the light emitting unit and light transmitting unit. It is disposed on the passivation layer and extends to cover the boundary region, providing a stable interface that prevents detachment. This intermediary structure allows the two units with different array layer configurations to coexist reliably without direct contact between incompatible structures.
Solution Approach 2:
The bank layer is formed using a composite structure involving the passivation layer and the bank layer material itself, creating a multi-layer composite at the boundary region. This composite structure provides both adhesion to the underlying passivation layer and a stable interface for the different array layer configurations, resolving the adhesion problem while maintaining functional differentiation.
3Device complexity
If the bank layer directly contacts the passivation layer, then structural simplicity is maintained, but adhesion is insufficient causing detachment
Solution Approach 1:
The bank layer is formed as a composite structure on the passivation layer, creating a multi-layer configuration that enhances attachment strength. The bank layer material combines with the passivation layer to form a stable composite interface, providing sufficient adhesion to prevent detachment while maintaining reasonable structural complexity.
Data Source
AI summary
Disclosed is an organic light emitting display device including a passivation layer, a planarization layer, a cover layer, and a bank layer. The passivation film may cover a first area, in which an organic light emitting diode is disposed, and a second area adjacent to the first area. The planarization layer may be disposed on the passivation film in the first area. The cover layer may be disposed to surround the planarization layer on the passivation film. The bank layer may cover at least an edge of an upper part of the planarization layer, and separate the first area.