OLED Packaging Transition Region Stress Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional OLED packaging is prone to cracking and failure due to stress concentration at the edges during bending, especially when using inorganic films that are hard and lack flexibility, which compromises the water and oxygen resistance essential for OLED devices.
Innovation Solution
The OLED packaging structure incorporates distinct packaging layers with varying thicknesses in different regions: a thicker packaging transition region between the peripheral and packaging regions, reducing stress concentration and enhancing the packaging reliability by using multiple inorganic layers such as silicon nitride, aluminum oxide, or silicon oxynitride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic packaging film is used for OLED packaging, then water and oxygen resistance is improved, but stress concentration at edges during bending causes cracking and packaging failure
Solution Approach 1:
The patent applies local quality by creating a packaging structure with varying thickness across different regions. The packaging transition region has increased thickness compared to the packaging peripheral region, providing localized reinforcement at stress-prone areas while maintaining overall packaging performance and water/oxygen resistance.
Solution Approach 2:
The patent employs composite materials by combining multiple packaging layers with different thicknesses and potentially different material compositions. The packaging structure includes a packaging peripheral region, a packaging transition region, and a packaging active region, forming a composite structure that balances protection, flexibility, and stress distribution.
2Strength
If uniform thickness packaging layer is used, then manufacturing simplicity is maintained, but stress distribution is uneven causing edge cracking
Solution Approach 1:
The packaging structure implements local quality through region-specific thickness design. The packaging transition region positioned between the packaging peripheral region and packaging active region has greater thickness to specifically address stress concentration issues at this critical location, while other regions maintain appropriate thickness for their functional requirements.
Solution Approach 2:
The patent applies segmentation by dividing the packaging structure into distinct regions: packaging peripheral region, packaging transition region, and packaging active region. Each region is independently designed with specific thickness characteristics to optimize performance for its particular functional requirements and stress conditions.
Data Source
AI summary
Embodiments of the present disclosure provide an organic light-emitting diode (OLED) packaging structure and a manufacturing method thereof. The OLED packaging structure includes: a substrate; an OLED, disposed on the substrate and including active and non-active display region; a packaging peripheral region, disposed on the substrate and packaging a portion except the OLED; a packaging region, disposed on the OLED and packaging the active display region of the OLED; and a packaging transition region, disposed between the packaging peripheral region and the packaging region and packaging the non-active display region of the OLED, wherein each of the three regions includes an packaging layer, and a thickness of the packaging layer of the packaging transition region is greater than the thickness of the packaging layer of the packaging peripheral region.