OLED Capping Layer Integration for Thin-Film Encapsulation
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Solution Overview
Problem
Existing organic light-emitting display apparatuses have a complex and thick structure due to the use of a multi-layer encapsulation layer to block moisture and oxygen, which complicates manufacturing and increases thickness.
Innovation Solution
A simplified structure for the organic light-emitting display apparatus is achieved by using a thin-film encapsulation layer comprising a first organic layer, a second organic layer, and an inorganic layer, where the first organic layer is directly contacted with the capping layer and the second organic layer, and the inorganic layer is directly contacted with the second organic layer, minimizing the thickness and potential damage to the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layer encapsulation layer is used to block moisture and oxygen, then protection from impurities is improved, but device thickness and structural complexity increase
Solution Approach 1:
The patent combines the encapsulation function with the existing capping layer structure by directly contacting the first organic layer with the capping layer, eliminating the need for separate encapsulation layers and reducing overall device thickness while maintaining protection from moisture and oxygen
Solution Approach 2:
The capping layer is designed to serve dual functions: as part of the electrode structure and as the encapsulation layer that blocks moisture and oxygen, thereby reducing the number of additional layers needed and simplifying the overall device structure
2Reliability
If a multi-layer encapsulation layer is used to block moisture and oxygen, then protection from impurities is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the encapsulation function into the existing capping layer structure, reducing the total number of discrete layers and simplifying the manufacturing process while maintaining effective protection against moisture and oxygen
Solution Approach 2:
The patent extracts and eliminates redundant encapsulation layers from the traditional multi-layer structure, keeping only the essential first organic layer that directly contacts the capping layer, thereby simplifying the overall structure and manufacturing process
3Reliability
If traditional encapsulation structures are used, then protection from impurities is ensured, but material reactions and potential damage occur
Solution Approach 1:
The first organic layer serves as an intermediary between the capping layer and the rest of the device structure, providing a chemically stable interface that prevents harmful reactions between different materials while maintaining effective encapsulation
Solution Approach 2:
The patent changes the material parameters by using specific organic materials with controlled chemical properties in the first organic layer, optimizing both the protective function and chemical compatibility to prevent material reactions
Data Source
AI summary
An organic light-emitting display apparatus includes a substrate, a pixel electrode on the substrate, a capping layer on the pixel electrode, a second organic layer on the capping layer, a first organic layer between the capping layer and the second organic layer and corresponding to the pixel electrode, and an inorganic layer on the second organic layer.