Organic Light-Emitting Display Barrier Layer for Moisture and Particle Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light-emitting display apparatuses are susceptible to deterioration due to external moisture and oxygen, requiring effective sealing to prevent damage, but existing sealing methods fail to adequately protect the devices from high-energy particles and maintain optimal optical performance.
Innovation Solution
A multi-layer barrier system comprising a first alkali metal-containing barrier layer, such as lithium fluoride, and a second amorphous inorganic oxide barrier layer, like SiO, is introduced between the organic light-emitting device and the thin film encapsulation layer to prevent high-energy particle penetration and improve the membranous properties of the encapsulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin film encapsulation layer is formed to cover the organic light-emitting device, then protection from external moisture and oxygen is improved, but high-energy particles can still penetrate and cause progressive dark spots
Solution Approach 1:
The patent applies composite materials by creating a multi-layer barrier structure consisting of an alkali metal-containing compound layer combined with an inorganic oxide layer. This composite barrier layer integrates the moisture and oxygen blocking properties of the alkali metal compound with the high-energy particle resistance of the inorganic oxide, solving both protection requirements simultaneously.
Solution Approach 2:
The patent segments the barrier function into two distinct layers: the first layer containing an alkali metal-containing compound for moisture and oxygen protection, and the second layer containing an inorganic oxide for high-energy particle resistance. This segmentation allows each layer to specialize in one protective function, achieving comprehensive protection more effectively than a single-layer approach.
2Length of moving object
If the encapsulation layer is made thinner to reduce device thickness, then device thinning is achieved, but sealing effectiveness against moisture and oxygen deteriorates
Solution Approach 1:
The composite barrier layer combines two materials with complementary properties, allowing the encapsulation layer to maintain thin overall thickness while achieving enhanced sealing effectiveness. The synergistic combination of alkali metal compound and inorganic oxide provides superior barrier performance that enables thin-film design without compromising protection.
3Ease of manufacture
If conventional sealing methods are used, then manufacturing simplicity is maintained, but optical performance deteriorates due to high-energy particle damage
Solution Approach 1:
The segmented two-layer barrier structure can be formed using sequential deposition processes that are compatible with existing manufacturing equipment and techniques. Each layer can be deposited independently using standard vacuum deposition or atomic layer deposition methods, maintaining manufacturing simplicity while adding the necessary protective functionality to preserve optical performance.
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
The barrier system effectively prevents progressive dark spots and enhances the optical performance of the organic light-emitting display by capturing high-energy oxygen atoms, reducing light usage efficiency loss, and maintaining the integrity of the organic light-emitting layer.
Implementation Method 1
The second barrier layer may have a region having a higher concentration of oxygen than other regions thereof
Data Source
AI summary
An organic light-emitting display apparatus including a substrate; an organic light-emitting device formed on the substrate; a thin film encapsulation layer that is formed on the organic light-emitting device and covers the organic light-emitting device; and a barrier layer disposed between the organic light-emitting device and the thin film encapsulation layer, in which the barrier layer includes a first barrier layer formed on the organic light-emitting device and including an alkali metal-containing compound; and a second barrier layer disposed between the first barrier layer and the thin film encapsulation layer and including an amorphous inorganic oxide.