OLED Encapsulation Layer Plasma Resistance via Composite Acrylates
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Solution Overview
Problem
Organic light emitting diodes (OLEDs) are vulnerable to moisture and gas, leading to delamination and degradation due to plasma etching of organic layers, which compromises their luminous characteristics and reliability.
Innovation Solution
An OLED display apparatus with an encapsulation layer having a multilayer structure of alternately stacked inorganic and organic layers, where the organic layers are formed using a composition of non-silicon-based and silicon-based di(meth)acrylates, mono(meth)acrylates, and initiators, providing high plasma resistance, low water vapor and oxygen permeability, and excellent transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic layers are formed by plasma deposition to create encapsulation layers, then the encapsulation structure can be formed, but the organic layers are etched by plasma which deteriorates encapsulation function and provides adverse influence on formation of inorganic layers
Solution Approach 1:
The patent changes the chemical composition parameters of the organic encapsulation layer by using specific ratios of non-silicon-based di(meth)acrylate (10-70 wt%), silicon-based di(meth)acrylate (20-70 wt%), and mono(meth)acrylate (5-40 wt%). This compositional parameter change increases plasma resistance while maintaining encapsulation function and transparency.
Solution Approach 2:
The patent creates a composite organic encapsulation material by combining multiple acrylate types (non-silicon-based di(meth)acrylate, silicon-based di(meth)acrylate, and mono(meth)acrylate) with specific molecular structures. This composite approach provides synergistic effects that simultaneously improve plasma resistance, moisture barrier properties, and optical transparency.
2Reliability
If the encapsulation layer includes multiple inorganic layers stacked alternately with organic layers, then encapsulation structure is formed, but slight lifting or delamination occurs between layers which allows moisture and oxygen penetration
Solution Approach 1:
The patent modifies the organic layer composition parameters to include specific functional groups and molecular weights that enhance interfacial adhesion. The use of di(meth)acrylate compounds with specific structural parameters improves bonding between organic and inorganic layers, preventing delamination and lifting.
3Length of moving object
If organic layers are made thinner to reduce overall device thickness, then device compactness is improved, but plasma resistance and moisture barrier properties are reduced
Solution Approach 1:
The patent employs a composite organic encapsulation material containing multiple acrylate components with complementary properties. The silicon-based di(meth)acrylate provides plasma resistance, while non-silicon-based di(meth)acrylate and mono(meth)acrylate contribute to barrier properties and adhesion. This composite formulation enables thin film design with sufficient protective performance.
Solution Approach 2:
The patent optimizes the thickness and composition parameters of the organic encapsulation layer to achieve minimum effective thickness. By adjusting the molecular structure parameters of the acrylate compounds and their weight ratios, the patent achieves adequate plasma resistance and barrier properties in thinner films.
4Ease of manufacture
If the organic encapsulation layer is exposed at the edge of the encapsulation structure, then manufacturing simplicity is improved, but reliability in elapsed time deteriorates due to vulnerability to moisture and oxygen
Solution Approach 1:
The patent uses a composite organic encapsulation material with enhanced chemical resistance and barrier properties that can effectively protect the OLED even when exposed at edges. The combination of different acrylate types provides superior resistance to environmental degradation compared to single-component organic materials.
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 solution enhances the reliability and durability of OLEDs by preventing moisture and gas penetration, reducing plasma etching, and maintaining luminous efficiency over time.
Implementation Method 1
the encapsulating composition includes: about 10 wt % to about 70 wt % of (A) a non-silicon-based di(meth)acrylate, about 20 wt % to about 70 wt % of (B) a silicon-based di(meth)acrylate, about 5 wt % to about 40 wt % of (C) a mono(meth)acrylate, and about 1 wt % to about 10 wt % of (D) an initiator
Data Source
AI summary
Disclosed is an organic light emitting diode display apparatus including: a substrate; an organic light emitting diode disposed on the substrate; and an encapsulation layer encapsulating the organic light emitting diode. The encapsulation layer has a structure in which two or more inorganic layers and one or more organic layers are alternately stacked one above another, two adjacent inorganic layers at least partially contact each other, and the organic layers are formed of an encapsulating composition. The encapsulating composition includes: about 10 wt % to about 70 wt % of (A) a non-silicon-based di(meth)acrylate, about 20 wt % to about 70 wt % of (B) a silicon-based di(meth)acrylate, about 5 wt % to about 40 wt % of (C) a mono(meth)acrylate, and about 1 wt % to about 10 wt % of (D) an initiator, the (B) silicon-based di(meth)acrylate being represented by Formula 1.