Light-Emitting Device Moisture Barrier Structure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Light-emitting devices using organic materials face reliability issues due to moisture-induced deterioration, leading to periphery degradation and reduced luminance, despite existing measures to mitigate these problems, further improvements in reliability are needed.
Innovation Solution
A light-emitting device structure is developed with a first organic insulating film, inorganic films, and a sealing material where gaps and overlaps are strategically placed to prevent water penetration, including a gap between the sealing material and the electrode, and the use of inorganic films with specific widths and arrangements to reduce surface tension and hinder water penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If an organic insulating film is used in the light-emitting device, then flatness and capability to reduce unevenness are improved, but periphery deterioration is accelerated
Solution Approach 1:
The device is segmented into multiple functional layers with distinct materials: organic insulating films for flatness and inorganic films for moisture barrier. This segmentation allows each layer to perform its specialized function without compromising the other, resolving the contradiction between flatness and reliability.
Solution Approach 2:
The patent employs a composite structure combining organic insulating films (for flatness and unevenness reduction) with inorganic films (for moisture barrier properties). This composite material approach allows the device to simultaneously achieve the flatness benefits of organic materials and the reliability benefits of inorganic materials, directly resolving the technical contradiction.
2Reliability
If existing sealing measures are applied to prevent moisture, then some reliability improvement is achieved, but sufficient reliability for long period is not obtained
Solution Approach 1:
The inorganic film is formed beforehand as a preventive moisture barrier layer before the organic insulating film is applied. This preliminary protective action ensures that moisture is blocked at the source, providing long-term reliability that extends beyond what conventional sealing measures alone can achieve.
Solution Approach 2:
The patent uses thin film structures (both organic and inorganic) that provide effective moisture protection while maintaining the overall thin and light characteristics of the display. These thin films create a flexible yet effective barrier system that prevents moisture penetration over extended periods.
3Reliability
If the inorganic film is formed to cover the electrode, then moisture barrier is improved, but water penetration cannot be effectively prevented due to surface tension
Solution Approach 1:
The patent applies different material properties at different locations: the inorganic film provides moisture barrier properties in areas where needed, while gaps are intentionally created in specific locations to prevent water penetration. This local differentiation of material properties and structure allows the device to achieve effective moisture protection without suffering from water penetration issues.
Solution Approach 2:
The organic insulating film acts as an intermediary layer between the inorganic moisture barrier film and the environment. This intermediary structure, combined with strategically placed gaps, creates a multi-layer defense system that effectively prevents water penetration while maintaining moisture barrier properties.
Data Source
AI summary
It is an object of the present invention to provide a light-emitting device where periphery deterioration can be prevented from occurring even when an organic insulating film is used as an insulating film for the light-emitting device. In addition, it is an object of the present invention to provide a light-emitting device where reliability for a long period of time can be improved. A structure of an inorganic film, an organic film, and an inorganic film is not continuously provided from under a sealing material under a cathode for a light-emitting element. In addition, penetration of water is suppressed by defining the shape of the inorganic film that is formed over the organic film even when a structure of an inorganic film, an organic film, and an inorganic film is continuously provided under a cathode for a light-emitting element.