Thin Film Packaging Structure for OLED Light Extraction
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Solution Overview
Problem
The light extraction efficiency of active light-emitting devices, such as OLEDs, is low due to the microcavity structure between the electrode layer and the substrate, leading to significant luminous efficiency loss.
Innovation Solution
A thin film packaging structure comprising a flexible thin film with at least two organic film layers, one or more inorganic film layers, and a light extraction film layer with microstructures (conical, cylindrical, or spherical) that enhances light extraction, which can be located between or on top of the organic film layers, and a protecting layer made of organic resin for added protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional thin film packaging structure is used, then the device is well-protected from environmental factors, but the light extraction efficiency is low due to microcavity structure
Solution Approach 1:
The packaging structure is divided into multiple functional layers: organic film layers for basic packaging, inorganic film layers for enhanced barrier properties, and a light extraction film layer with microstructures for improving light extraction. This segmentation allows each layer to perform its specific function optimally without compromising overall protection.
Solution Approach 2:
The light extraction film layer introduces localized microstructures (conical, cylindrical, or spherical) that create specific optical properties in certain regions of the packaging structure. These microstructures are strategically positioned to enhance light extraction at the light-emitting interface while maintaining the integrity and protective function of the overall packaging structure.
2Loss of energy
If a light extraction film layer with microstructures is added, then the light extraction efficiency is improved, but the device complexity increases
Solution Approach 1:
The light extraction film layer serves multiple functions: it acts as a barrier layer protecting the device from environmental factors while simultaneously functioning as a light extraction enhancement layer through its microstructures. This multi-functionality reduces the need for separate dedicated light extraction components, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The packaging structure employs composite material architecture combining organic films, inorganic films, and the light extraction film layer with microstructures. This composite approach integrates multiple material properties and functions within a unified structure, achieving enhanced light extraction without proportionally increasing structural complexity.
3Reliability
If multiple layers of organic and inorganic film are used, then the barrier against oxygen and water is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines the packaging function and light extraction function into a single integrated thin film structure. The multiple organic and inorganic film layers are deposited in sequence to create both the barrier function and, when combined with the light extraction film layer, the light extraction enhancement, thereby combining multiple functions into one manufactured component.
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 structure significantly improves the luminous efficiency of light-emitting display devices by enhancing light extraction and preventing external oxygen and water permeation, while also extending the packaging's lifespan and usability.
Implementation Method 1
a light extraction film layer, and each layer of the inorganic film layer being located between the two layers of organic film layer, the light extraction film layer being located between the two layers of organic film layer or located on the outer surface of the outermost layer of the organic film layer, and the light extraction film layer including a plurality of microstructures with the function of light extraction
Implementation Method 2
the thin film packaging structure can cause the packaging structure to effectively prevent the permeation of external oxygen and water into the light-emitting display device by alternately setting the organic film layer and the inorganic film layer
Data Source
AI summary
Embodiments of the disclosure provide a thin film packaging structure including a flexible thin film used for packaging a light-emitting display device, wherein the flexible thin film includes at least two layers of organic film layer, at least one layer of inorganic film layer and a light extraction film layer, each layer of the inorganic film layer is located between the two layers of the organic film layer, the light extraction film layer is located between the two layers of organic film layer or located on the outer surface of the outermost layer of the organic film layer, and the light extraction film layer includes a plurality of microstructures with the function of light extraction. The thin film packaging structure provided by embodiments of the disclosure can improve the luminous efficiency of the organic light-emitting display device packaged by the thin film packaging structure.