OSC Capping Layer Tunable Refractive Index for OLED Light Extraction
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Solution Overview
Problem
Current OLED-based display systems face challenges in light extraction efficiency due to phenomena such as surface plasmon polariton modes and waveguide modes, leading to reduced performance and increased costs.
Innovation Solution
Incorporating an organic solid crystal (OSC) capping layer with tunable refractive index and a multilayer thin film architecture to enhance light extraction efficiency, while also providing environmental protection against oxygen and water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional OLED structure is used, then manufacturing is simpler, but light extraction efficiency is reduced due to surface plasmon polariton modes and waveguide modes
Solution Approach 1:
An organic solid crystal (OSC) capping layer is introduced as an intermediary component between the OLED emissive layer and the external environment. This OSC layer serves as a mediator that extracts trapped light energy by converting surface plasmon polariton modes and waveguide modes into extractable photons, thereby reducing optical losses without requiring complex structural modifications to the OLED itself
Solution Approach 2:
The patent employs a composite material system consisting of multiple functional layers including the OSC capping layer, additional thin film layers with varying refractive indices, and encapsulation layers. This composite structure combines materials with different optical properties to systematically address light extraction inefficiencies at multiple interfaces and modes simultaneously
2Loss of energy
If OSC capping layer with tunable refractive index is added, then light extraction efficiency improves, but device complexity increases
Solution Approach 1:
The OSC capping layer utilizes tunable refractive index as a key parameter to optimize light extraction efficiency. By adjusting the refractive index of the OSC layer to match specific optical modes and interfaces, the system maximizes light extraction while maintaining a relatively simple single-layer or multi-layer structure rather than requiring complex geometric or structural modifications
3Loss of energy
If OSC capping layer is implemented, then light extraction efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs thin film OSC capping layers that can be deposited using conventional vacuum deposition or solution processing techniques. These thin films provide the necessary optical functionality while being compatible with existing OLED manufacturing processes, reducing the need for specialized high-precision manufacturing equipment or procedures
4Loss of energy
If OSC capping layer is added for light extraction, then display performance improves, but cost increases
Solution Approach 1:
The OSC capping layer is designed with optimized thickness parameters and refractive index values that can be achieved through conventional thin film deposition techniques. By selecting OSC materials and layer thicknesses that work effectively within existing manufacturing capabilities, the patent avoids the need for expensive specialized equipment or multi-step complex processes, thereby controlling manufacturing costs while achieving improved light extraction efficiency
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 OSC capping layer improves light extraction efficiency and reduces optical losses, enabling higher resolution and cost-effective OLED displays for applications like AR/VR headsets.
Implementation Method 1
Incorporating an organic solid crystal (OSC) capping layer with tunable refractive index to enhance light extraction efficiency
Implementation Method 2
Current OLED-based display systems face challenges in light extraction efficiency due to phenomena such as surface plasmon polariton modes
Implementation Method 3
Current OLED-based display systems face challenges in light extraction efficiency due to phenomena such as waveguide modes
Implementation Method 4
the OSC capping layer improves light extraction efficiency and reduces optical losses, enabling higher resolution and cost-effective OLED displays for applications like AR/VR headsets
Data Source
AI summary
A light-emitting device includes a light-emitting diode having an emissive surface, and a capping layer including an organic solid crystal overlying the emissive surface. The refractive index of the organic solid crystal may be tuned such as through the application of a voltage, current, or stress to improve the light extraction efficiency of the device.