OLED Encapsulation Using Inkjet Printed Organic and Sputtered Inorganic Layers
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Solution Overview
Problem
Organic light emitting display (OLED) devices are prone to degradation due to moisture and oxygen penetration, leading to issues like dark spots, which existing encapsulation technologies have not adequately addressed.
Innovation Solution
A composition comprising specific aromatic aryl amine compounds and an encapsulation layer structure with alternating organic and inorganic layers, where the organic layer is formed using an inkjet printing method to prevent moisture and oxygen infiltration, and the inorganic layer is formed using sputtering or chemical vapor deposition to cover the organic layer effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encapsulation technology is used to prevent moisture and oxygen penetration, then OLED durability is improved, but dark spots still occur due to insufficient sealing effectiveness
Solution Approach 1:
The patent uses a composite encapsulation structure combining organic and inorganic layers. The organic layer (formed by inkjet printing) provides continuous coverage and flexibility, while the inorganic layer (formed by sputtering or CVD) provides barrier properties against moisture and oxygen. This composite approach overcomes the limitations of single-material encapsulation that allows dark spot formation.
Solution Approach 2:
The encapsulation layer is divided into multiple functional layers: an organic layer for continuous coverage and an inorganic layer for barrier protection. This segmentation allows each layer to perform its specialized function, with the organic layer preventing pinhole formation and the inorganic layer providing moisture/oxygen barrier, thereby eliminating dark spots while maintaining durability.
2Manufacturing precision
If inkjet printing method is used to form organic layer, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional vacuum deposition methods with inkjet printing for forming the organic layer. Inkjet printing offers precise material placement and composition control, enabling accurate formation of the encapsulation layer without the complexity of vacuum equipment, thereby improving manufacturing precision while managing device complexity.
Solution Approach 2:
The patent changes the formation method parameter from vacuum deposition to inkjet printing, which allows precise control over material deposition, composition, and thickness. This parameter change improves manufacturing precision for the organic layer while the automated nature of inkjet printing keeps process complexity manageable.
3Object-affected harmful factors
If alternating organic and inorganic layers are used, then sealing effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The encapsulation is segmented into alternating organic and inorganic layers, where the organic layer provides continuous coverage and the inorganic layer provides barrier properties. This segmentation achieves superior sealing effectiveness against moisture and oxygen penetration.
Solution Approach 2:
The inorganic layer is formed as a porous structure through sputtering or CVD processes. This porous inorganic layer, when combined with the organic layer, creates an effective barrier system that prevents moisture and oxygen penetration while using materials and processes that are cost-effective for manufacturing.
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 significantly reduces the occurrence of dark spots in OLEDs by effectively sealing the display apparatus, enhancing its durability and reliability against external environmental factors.
Implementation Method 1
the inorganic layer is formed using sputtering or chemical vapor deposition
Implementation Method 2
the inorganic layer is formed using sputtering or chemical vapor deposition
Data Source
AI summary
In an aspect, a composition including an acrylate monomer, and aromatic aryl amine compound, an organic light emitting display apparatus including the composition and a method of manufacturing an organic light emitting display apparatus including the composition are provided.