Dual Seal Line Structure for OLED Moisture Resistance
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Solution Overview
Problem
Existing organic electroluminescent devices are susceptible to moisture and foreign substance penetration due to a single seal line used for attaching substrates, which compromises the integrity of the device and its vacuum environment.
Innovation Solution
The implementation of dual seal lines, where one seal line attaches the upper and lower substrates and the other seals off the edge regions, preventing external moisture and foreign substance ingress, without requiring modifications to the bezel region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single seal line is used to attach substrates, then the device structure is simple, but the device is susceptible to moisture and foreign substance penetration
Solution Approach 1:
The single seal line is divided into two separate seal lines: a first seal line for attaching the substrates and a second seal line for sealing the edge regions. This segmentation allows each seal line to perform its specific function independently, improving overall moisture resistance without significantly increasing structural complexity
Solution Approach 2:
The sealing approach transitions from a single-line (one-dimensional) seal to a dual-line (two-dimensional) seal configuration. The first seal line attaches substrates at one location while the second seal line seals edges at a different location, creating a multi-layered defense against moisture penetration
2Ease of manufacture
If a single seal line is used for substrate attachment, then the fabrication process is simple, but the vacuum integrity is compromised
Solution Approach 1:
The sealing function is segmented into two distinct operations: substrate attachment via the first seal line and edge sealing via the second seal line. This segmentation maintains fabrication simplicity while ensuring vacuum integrity through comprehensive sealing
Solution Approach 2:
The second seal line is formed beforehand to seal the edge regions before the device is exposed to external environments. This preventive sealing approach ensures that moisture and foreign substances cannot penetrate through edge regions, protecting the vacuum integrity of the device
3Reliability
If dual seal lines are formed, then moisture resistance is improved, but the device structure becomes more complex
Solution Approach 1:
The dual seal line structure segments the sealing function into two independent lines with distinct purposes. The first seal line handles substrate attachment while the second seal line handles edge sealing, allowing each to be optimized for its specific function without interfering with the other
Solution Approach 2:
Both seal lines use the same seal material and formation process, providing a universal solution that addresses multiple sealing needs (substrate attachment and edge sealing) with a consistent methodology, thereby limiting the increase in device complexity
Data Source
AI summary
Provided are an organic electroluminescent device and a fabrication method thereof. The organic electroluminescent device includes a first substrate, a second substrate, an organic electroluminescent layer formed on the first substrate, a thin film transistor formed on the second substrate, and first and second seal lines attaching the first and second substrates to each other.