Planarizing Layer Oligomer Control for OLED Distortion
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Solution Overview
Problem
The distortion of the planarizing layer in organic electroluminescent display devices leads to issues such as moisture discharge and electrical connection problems, reducing the reliability and lifespan of the devices.
Innovation Solution
A planarizing layer with a remaining oligomer proportion of 5% or less, formed by polymerizing an oligomer with a molecular weight of 500 to 5,000, is used to prevent distortion and improve adhesion to lower electrodes, ensuring the stability and longevity of the organic EL display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a planarizing layer is provided between switching elements and lower electrodes, then planarization is achieved, but distortion occurs leading to moisture discharge and wire disconnection
Solution Approach 1:
The patent changes the chemical composition parameters of the planarizing layer by controlling the oligomer content to 5% or less based on the amount of oligomer used to form the layer. This parameter control prevents distortion while maintaining planarization functionality, resolving the contradiction between achieving planarization and preventing distortion-induced reliability issues.
2Ease of manufacture
If the planarizing layer is formed with conventional oligomer content, then ease of manufacture is improved, but adhesion to lower electrodes deteriorates
Solution Approach 1:
The patent optimizes the oligomer content parameter to 5% or less, which simultaneously maintains ease of manufacture through simple formation processes and significantly improves adhesion strength to lower electrodes. This parameter optimization resolves the contradiction between manufacturing ease and adhesion strength.
3Ease of manufacture
If the planarizing layer contains high oligomer content, then ease of manufacture is improved, but distortion and moisture discharge increase
Solution Approach 1:
The patent controls the oligomer content parameter at 5% or less to prevent moisture discharge and distortion while maintaining ease of manufacture. This parameter control eliminates the harmful effects of high oligomer content without complicating the manufacturing process.
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 planarizing layer distortion, maintains the performance of the organic EL display device over time, and enhances the adhesion to lower electrodes, thereby improving the reliability and lifespan of the device.
Implementation Method 1
the step of forming a planarizing layer is a step of disposing an oligomer having a molecular weight of 500 to 5,000, followed by polymerization thereof
Data Source
AI summary
The present invention provides an organic EL display device having a planarizing layer, which is prevented from being distorted. The above organic EL display device has a planarizing layer, which retains 5% or less the oligomer used to form this layer.