OLED Encapsulation with Scattering Particles to Reduce Cathode Reflection
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Solution Overview
Problem
Current OLEDs suffer from reduced contrast and clarity due to the high reflective nature of metal cathodes, which cause ambient and internal scattering lights to be reflected, leading to decreased brightness and clearness.
Innovation Solution
An encapsulation structure comprising a polymer first encapsulation layer and a ceramic second encapsulation layer with scattering particles, such as spherical or arc-shaped particles, is introduced between the layers to scatter incident lights and reduce reflection from the cathode, enhancing the OLED's brightness and clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a metal cathode is used as the reflective layer, then the reflective rate is improved, but the contrastness and clearness of the OLED deteriorate
Solution Approach 1:
The patent introduces an encapsulation structure with scattering particles as an intermediary layer between the metal cathode and the light-emitting components. This scattering layer mediates the interaction between light and the metal cathode, converting direct reflection into scattered light transmission, thereby maintaining the reflective function while eliminating the harmful glare that reduces contrast and clarity.
Solution Approach 2:
The patent converts the harmful reflective property of the metal cathode into a beneficial scattering function. By incorporating scattering particles within the encapsulation structure, the previously harmful direct reflection is transformed into useful light scattering that enhances light extraction efficiency while improving contrast and visual clarity.
2Object-affected harmful factors
If scattering particles are introduced to reduce reflection, then the contrastness and clearness are improved, but the device complexity increases
Solution Approach 1:
The encapsulation structure performs multiple functions simultaneously: it provides mechanical protection, environmental sealing, and optical scattering. By integrating the scattering function into the existing encapsulation layers rather than adding separate components, the patent achieves improved contrast and clarity without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the scattering function with the encapsulation structure by incorporating scattering particles into the encapsulation layers. This consolidation combines protective and optical functions into a single integrated structure, avoiding the need for separate scattering components and thereby limiting the increase in device complexity.
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 encapsulation structure effectively scatters ambient and stray lights, thereby improving the contrast and clarity of OLEDs by minimizing light reflection from the cathode, resulting in enhanced brightness and visual quality.
Implementation Method 1
scattering particles are configured to scatter incident lights
Data Source
AI summary
A OLED encapsulation structure includes: a first encapsulation layer; a second encapsulation arranged on one side of the first encapsulation layer; and scattering particles formed between the first encapsulation layer and the second encapsulation layer, and the scattering particles are configured to scatter incident lights. In addition, an encapsulation method of OLEDs and the OLEDs having the encapsulation structure are disclosed. The scattering particles are formed within the cathode encapsulation layer. The scattering particles may generate the scattering effect for the ambient lights or the stray lights to reduce the reflection of the light beams by the cathode. Thus, the brightness and the clearness of the OLED may be enhanced.