Display Device Sealing Member Refractive Index Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Self-luminous display devices are vulnerable to moisture and oxygen, leading to defects such as dark spots and pixel shrinkage, which compromises their reliability and efficiency.
Innovation Solution
A display device with a sealing member comprising a first inorganic layer with a refractive index of 1.58 to 1.64, an organic layer, and a second inorganic layer with a refractive index of 1.58 to 2.00, which effectively blocks foreign matter and enhances the device's barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing member is used to protect the light emitting element from moisture and oxygen, then reliability is improved, but device complexity increases due to multiple layers
Solution Approach 1:
The sealing member is constructed as a composite structure with three distinct layers: a first inorganic layer (silicon oxide or silicon oxynitride) directly on the light emitting element, an organic layer in the middle, and a second inorganic layer (silicon nitride) on the outer surface. Each layer provides specific protective functions, creating a synergistic barrier that effectively blocks both moisture and oxygen while maintaining structural integrity
Solution Approach 2:
The sealing function is divided into three separate layers, each with specific material properties and thicknesses optimized for particular protective roles. The first inorganic layer provides initial protection and adhesion, the organic layer provides flexibility and additional barrier properties, and the second inorganic layer provides enhanced environmental resistance. This segmentation allows each layer to be independently optimized
2Reliability
If the sealing member blocks foreign matter effectively, then reliability is improved, but light emission efficiency may deteriorate due to additional layers
Solution Approach 1:
The refractive indices of all three sealing layers are carefully controlled to be within specific ranges (first inorganic layer: 1.5-1.7, organic layer: 1.4-1.6, second inorganic layer: 1.6-1.9). This parameter optimization minimizes optical impedance mismatches and reduces light reflection at interfaces, thereby maintaining high light extraction efficiency while providing effective environmental protection
Solution Approach 2:
Each layer of the sealing member is designed with specific local properties: the first inorganic layer has high adhesion and provides initial protection, the organic layer provides flexibility and stress relief, and the second inorganic layer provides enhanced chemical resistance. The thickness and material composition of each layer are locally optimized to balance protection and optical performance
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 significantly improves the reliability and efficiency of the display device by preventing moisture and oxygen ingress, reducing defects and maintaining performance even under high humidity and temperature conditions.
Implementation Method 1
a first inorganic layer on the light emitting element and having a refractive index of 1.58 to 1.64
Implementation Method 2
a second inorganic layer on the organic layer and having a refractive index of 1.58 to 2.00... blocks foreign matter such as oxygen and moisture from flowing in the display device from the outside
Data Source
AI summary
A display device includes a light emitting element, and a sealing member on the light emitting element and sealing the light emitting element, wherein the sealing member includes a first inorganic layer on the light emitting element, an organic layer on the first inorganic layer, and a second inorganic layer on the organic layer.