OLED Package Moisture Absorption Zone Design
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Solution Overview
Problem
Conventional OLED packages face challenges with moisture and oxygen invasion, leading to reduced service life, and existing solutions either compromise on optical properties or are unsuitable for large-size displays due to thick glass and inadequate sealing.
Innovation Solution
The proposed OLED package incorporates a substrate, a lighting component, a compound barrier layer, a moisture absorption zone, and an inorganic barrier layer, where the moisture absorption zone is positioned aside the lighting component to prolong the invasion path of moisture and oxygen, reducing the risk of accumulation and maintaining optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal cover is used to block moisture and oxygen, then the protection against moisture and oxygen is improved, but the light transmission is blocked making it unsuitable for top emission type OLED devices
Solution Approach 1:
The patent replaces the traditional metal cover with a thin film encapsulation structure consisting of multiple alternating layers of inorganic barrier layers and organic buffer layers. This flexible thin film structure provides effective moisture and oxygen barrier protection while remaining transparent to light, enabling top emission type OLED devices to function properly.
Solution Approach 2:
The patent employs a composite barrier structure with alternating inorganic and organic layers. The inorganic layers provide superior moisture and oxygen barrier properties, while the organic buffer layers provide stress relief and defect coverage, creating a synergistic composite material system that achieves both protection and light transmission.
2Reliability
If glass thickness is increased to improve sealing, then the protection against moisture and oxygen is improved, but the package thickness increases and manufacturing stability deteriorates
Solution Approach 1:
The patent replaces thick glass sealing structures with thin film encapsulation layers that provide equivalent or superior barrier protection at much reduced thickness. The multiple thin layers of inorganic and organic materials create an effective sealing system without the bulk of traditional glass packages.
Solution Approach 2:
The patent changes the protective barrier from thick macro-scale glass structures to thin nano-scale film layers. This parameter change in thickness and scale maintains protection effectiveness while dramatically reducing overall package thickness and improving manufacturing stability for large size panels.
3Reliability
If multiple barrier layers are stacked to block moisture and oxygen, then the protection is improved, but the device thickness increases
Solution Approach 1:
The patent uses ultra-thin film structures where multiple alternating layers of inorganic and organic materials are deposited in sequence. Each layer is only nanometers thick, allowing multiple barrier layers to be stacked while maintaining overall thinness. The inorganic layers provide barrier function while organic layers provide stress management, achieving high protection with minimal thickness increase.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively extends the service life of OLED devices by absorbing moisture and oxygen without increasing package thickness and minimizing optical property degradation, making it suitable for top emission type OLEDs and large-size displays.
Implementation Method 1
The moisture absorption zone is configured to prolong the invasion path of moisture and oxygen. When unpreventable moisture and oxygen invasion occurs, most of the moisture and oxygen are absorbed by the moisture absorption zone surrounding the lighting component
Data Source
AI summary
There is provided an OLED package including a substrate, a lighting component, a compound barrier layer, a moisture absorption zone and an inorganic barrier layer. The lighting component is formed on the substrate. The compound barrier layer completely seals the lighting component configured to block moisture and oxygen. The moisture absorption zone is formed on the substrate surrounding the compound barrier layer and is not formed upon the lighting component. The inorganic barrier layer completely seals the compound barrier layer and the moisture absorption zone configured to block moisture and oxygen.