Flexible OLED Encapsulation via Composite Barrier and Plated Metal Lines
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Solution Overview
Problem
Organic light emitting devices (OLEDs) face reliability issues due to water and oxygen permeation, which can damage the organic light emitting layer, leading to reduced device performance and lifespan.
Innovation Solution
A method of fabricating an OLED with a flexible substrate that includes a metal line, a gas barrier layer, and polymer patterns, where the gas barrier layer prevents water and oxygen from reaching the organic light emitting layer, and the metal line is formed using electroplating or electroless plating with a catalyst like palladium, enhancing the device's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate with metal lines is used in OLED fabrication, then device flexibility and design freedom are improved, but reliability deteriorates due to water and oxygen permeation damaging the organic light emitting layer
Solution Approach 1:
The patent employs a composite encapsulation structure combining organic polymer layers (first and second polymer patterns) with inorganic gas barrier layers. This multi-material approach creates a synergistic barrier system that provides both flexibility from the polymer components and effective water/oxygen blocking from the inorganic gas barrier layer, thereby maintaining device flexibility while improving reliability
Solution Approach 2:
The encapsulation structure is divided into multiple segmented layers including first polymer patterns, gas barrier layers, and second polymer patterns. This segmentation allows each layer to perform its specific function optimally - the polymer layers provide flexibility and structural support while the gas barrier layers provide selective permeability protection, collectively solving the reliability issue without compromising flexibility
2Manufacturing precision
If electroplating or electroless plating with catalyst is used to form metal lines, then manufacturing precision and reliability are improved, but device complexity increases
Solution Approach 1:
The patent applies catalyst coating to the substrate before performing electroless plating to form metal lines. This preliminary action prepares the surface in advance, enabling uniform metal deposition with high precision. By pre-coating the catalyst, the subsequent plating process becomes more controlled and predictable, achieving manufacturing precision while managing fabrication complexity through process sequencing
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 effectively prevents water and oxygen from entering the organic light emitting layer, thereby improving the reliability and longevity of the OLED, while also allowing for low-cost fabrication using printing or plating processes.
Implementation Method 1
the gas barrier layer prevents water and oxygen from reaching the organic light emitting layer
Implementation Method 2
the second metal layer may be formed using an electroplating or an electroless plating
Implementation Method 3
the catalyst may comprise palladium (Pd)
Data Source
AI summary
Disclosed are an organic light emitting device and a method of fabricating the same. The method of fabricating an organic light emitting device comprises forming a flexible substrate, and forming an organic light emitting layer on the flexible substrate. The forming the flexible substrate comprises, forming a first polymer pattern on a first metal layer, forming a second metal layer on an exposed portion of the first metal layer through the first polymer pattern, forming a gas barrier layer on the first polymer pattern and the second metal layer, forming a second polymer layer on the gas barrier layer, and removing the first metal layer to expose a surface of the first polymer pattern and a surface of the second metal layer.