OLED Adsorption Layer for Water Vapor Protection
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Solution Overview
Problem
Current OLED devices have a relatively short service life due to susceptibility to water vapor and oxygen in the air, which causes electrochemical erosion of metal cathodes and chemical reactions with organic functional layers, leading to device deactivation.
Innovation Solution
An array substrate with a thin film packaging layer and an adsorption layer that includes an organic material layer and a cathode material layer, laminated to adsorb water vapor and oxygen, preventing them from entering the organic electroluminescent structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a thin film packaging layer is used to cover the organic electroluminescent structure, then the device structure remains compact and simple, but water vapor and oxygen can still penetrate through the packaging layer and cause electrochemical erosion of the cathode and chemical reactions with organic functional layers
Solution Approach 1:
The patent applies composite materials by combining the thin film packaging layer with an adsorption layer made of organic material and cathode material. This composite structure provides both the compactness of thin film packaging and the protective function of adsorbing water vapor and oxygen, resolving the contradiction between structural simplicity and protection reliability.
Solution Approach 2:
The adsorption layer acts as an intermediary between the external environment and the organic electroluminescent structure. It intercepts and adsorbs water vapor and oxygen before they can reach and damage the cathode and organic functional layers, thereby protecting the device while maintaining structural simplicity.
2Power
If metal materials such as aluminum, magnesium, or calcium are used for the cathode to achieve low work function, then electron injection efficiency is improved, but the cathode becomes susceptible to electrochemical erosion in environments containing water vapor and oxygen
Solution Approach 1:
The adsorption layer serves as a protective intermediary between the metal cathode and the external environment containing water vapor and oxygen. It adsorbs these harmful substances before they can contact and erode the cathode, allowing the cathode to maintain its low work function and high electron injection efficiency without suffering from electrochemical erosion.
Solution Approach 2:
The patent converts the harmful effect of water vapor and oxygen into a beneficial protective mechanism. The adsorption layer utilizes the adsorption property of organic materials and cathode materials to actively capture and retain water vapor and oxygen, transforming these harmful substances into adsorbed species that cannot damage the cathode, thereby protecting the device.
3Reliability
If the adsorption layer is added above the thin film packaging layer, then protection against water vapor and oxygen is significantly improved, but the device structure becomes more complex with additional layers
Solution Approach 1:
The patent employs composite materials in the adsorption layer, combining organic material and cathode material together. This composite approach provides enhanced protection against water vapor and oxygen while keeping the additional structure relatively compact and integrated, minimizing 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 adsorption layer effectively protects the OLED structure from water vapor and oxygen, extending its life by preventing penetration and chemical reactions, thereby enhancing the durability of the OLED device.
Implementation Method 1
an adsorption layer disposed on the thin film packaging layer for adsorbing water vapor and oxygen
Data Source
AI summary
Disclosed are an array substrate, an organic electroluminescent display panel and a display apparatus. The array substrate includes: a base substrate, an organic electroluminescent structure disposed on the base substrate, a thin film packaging layer covering the organic electroluminescent structure, and an adsorption layer disposed on the thin film packaging layer.