Conductive Planarization Layer for OLED Substrate Roughness
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Solution Overview
Problem
Conventional OLED production is complex due to the roughness of steel foils used as substrates, which impairs the stability of organic materials and requires additional steps like planarization and scattering layer deposition, making the process inefficient and prone to damage from scattering particles.
Innovation Solution
A metal substrate with a conductive planarization layer having a lower surface roughness than the substrate, where the planarization layer is formed directly on the substrate and can include scattering centers in a matrix, allowing for efficient light scattering and simplifying the production process by combining properties in the planarization layer and substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a steel foil substrate with rough surface is used, then the substrate provides mechanical support and electrical conductivity, but the roughness impairs the stability of organic materials and requires additional planarization steps
Solution Approach 1:
The patent introduces an electrically conductive planarization layer as an intermediary between the rough steel foil substrate and the organically functional layer structure. This planarization layer serves dual purposes: it provides a smooth surface (with lower roughness than the substrate) to ensure stability of organic materials, while simultaneously maintaining electrical conductivity to support the OLED structure.
2Productivity
If a scattering layer with scattering particles is added to increase light coupling, then light extraction efficiency is improved, but the production complexity increases and scattering particles may damage the OLED
Solution Approach 1:
The patent merges the light scattering function with the planarization layer by embedding scattering centers within the electrically conductive planarization layer. This integration eliminates the need for a separate scattering layer, reducing production complexity and the risk of particle damage while maintaining effective light coupling through the scattering centers.
Solution Approach 2:
The planarization layer is designed to perform multiple functions simultaneously: it provides surface planarization for organic material stability, maintains electrical conductivity, and incorporates scattering centers for light coupling enhancement. This multi-functionality reduces the overall device complexity and number of production steps.
3Reliability
If planarization layer is applied to reduce surface roughness, then organic material stability is improved, but the production process becomes more complex
Solution Approach 1:
The patent combines the planarization function with electrical conductivity by using an electrically conductive planarization layer that serves both to smooth the surface for organic material stability and to provide necessary electrical conductivity, thereby reducing production complexity compared to separate layers.
Solution Approach 2:
The electrically conductive planarization layer performs multiple functions in one layer: surface planarization, electrical conduction, and light scattering (when scattering centers are embedded). This multi-functionality reduces the total number of production steps and overall process complexity.
4Reliability
If multiple separate layers are used for planarization, conductivity, and scattering, then each function is optimized, but the overall device complexity and production steps increase
Solution Approach 1:
The patent merges multiple functional layers (planarization layer, conductive layer, and scattering layer) into a single electrically conductive planarization layer with embedded scattering centers, reducing the number of layers and production steps while maintaining all necessary functions.
Solution Approach 2:
The electrically conductive planarization layer is designed as a multi-functional layer that simultaneously provides surface planarization, electrical conductivity, and light scattering capabilities through embedded scattering centers, eliminating the need for separate functional layers.
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
This approach reduces the complexity of OLED production by making scattering particles optional, facilitates structured light scattering, and improves electrical connections, resulting in a more efficient and stable light-emitting component with enhanced light coupling and reduced mechanical and thermal stresses.
Implementation Method 1
an electrically conductive planarization layer (108) is formed on the surface (120) of the metal substrate (102), wherein the planarization layer (108) includes a surface (130). The roughness of the surface (130) of the planarization layer (108) is lower than the roughness of the surface (120) of the metal substrate (102)
Implementation Method 2
The surface of at least one of the metal substrate or the planarization layer is formed in a light-scattering fashion
Data Source
AI summary
In various embodiments, an optoelectronic component is provided. The optoelectronic component includes a metal substrate having a surface, an electrically conductive planarization layer on the surface of the metal substrate, wherein the planarization layer comprises a surface, an organically functional layer structure on or above the surface of the planarization layer, and an electrode layer formed in a transparent fashion on or above the organically functional layer structure. The roughness of the surface of the planarization layer is lower than the roughness of the surface of the metal substrate. The surface of at least one of the metal substrate or the planarization layer is formed in a light-scattering fashion.