Wavelength Conversion Member with Nested Barrier Layers
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Solution Overview
Problem
Wavelength conversion efficiency in image display devices degrades when quantum dots are exposed to moisture or oxygen, leading to reduced performance in liquid crystal display devices.
Innovation Solution
A wavelength conversion member is designed with a wavelength conversion layer containing quantum dots, surrounded by an inorganic member and barrier layers, and connected by resin layers to inhibit moisture and oxygen entry, thereby reducing degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum dots are exposed to moisture or oxygen, then wavelength conversion efficiency degrades, but providing barrier layers increases device complexity
Solution Approach 1:
The patent implements a nested barrier structure where an inorganic barrier layer is positioned between organic barrier layers, creating a multi-layer protective envelope around the quantum dots. This nested configuration provides superior protection against moisture and oxygen penetration while maintaining structural organization
Solution Approach 2:
The patent combines organic and inorganic materials to form a composite barrier system. The organic barrier layers provide baseline protection and flexibility, while the inorganic barrier layer embedded between them provides enhanced impermeability to moisture and oxygen, creating a synergistic protective structure
2Reliability
If barrier layers are added to protect quantum dots, then wavelength conversion efficiency is maintained, but manufacturing process becomes more complex
Solution Approach 1:
The patent applies barrier layers to the quantum dot structure before final device assembly and sealing. By establishing the protective barrier configuration in advance, during the quantum dot layer formation process, the manufacturing process avoids the need for complex post-assembly barrier integration
Solution Approach 2:
The inorganic barrier layer is positioned and integrated between the organic barrier layers during the layer formation process, creating a nested structure that simplifies manufacturing by eliminating the need for separate barrier integration steps after device assembly
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 reduces the degradation of wavelength conversion efficiency by creating a barrier against moisture and oxygen, enhancing the longevity and performance of quantum dots in image display devices.
Implementation Method 1
an inorganic member disposed between the first barrier layer and the second barrier layer and surrounding the lateral surfaces of the wavelength conversion layer in a plan view
Data Source
AI summary
The wavelength conversion member includes: a wavelength conversion layer having a first main surface, a second main surface on a side opposite the first main surface, and lateral surfaces connecting the first main surface and the second main surface, the wavelength conversion layer containing quantum dots; a first barrier layer disposed on the first main surface; a second barrier layer disposed on the second main surface; an inorganic member disposed between the first barrier layer and the second barrier layer and surrounding the lateral surfaces of the wavelength conversion layer in a plan view; a first resin layer disposed between the first barrier layer and the inorganic member and connecting the first barrier layer and the inorganic member; and a second resin layer disposed between the second barrier layer and the inorganic member and connecting the second barrier layer and the inorganic member.