Quantum Dot Color Conversion Layer Encapsulation Against Moisture Damage
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Solution Overview
Problem
Quantum dot materials in mini LED and micro LED light-emitting devices are prone to damage from oxygen and moisture, degrading their light color conversion properties.
Innovation Solution
A light color conversion layer structure is designed with a pixel separation layer, a first isolation layer covering the substrate and sidewalls, a light color conversion unit within a receiving region, and a second isolation layer covering the first isolation layer and the light color conversion unit, to protect the quantum dots from moisture and oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dot materials are used for light color conversion, then color purity and luminance are improved, but the materials become damaged by oxygen and moisture, degrading their properties
Solution Approach 1:
The patent introduces an encapsulation structure comprising a first encapsulation layer and a second encapsulation layer as intermediary protective barriers between the quantum dot light color conversion layer and the external environment. These encapsulation layers prevent direct contact between oxygen/moisture and the quantum dots, thereby maintaining their light color conversion properties while preserving high luminance and color purity
Solution Approach 2:
The encapsulation structure creates an inert protective environment around the quantum dot light color conversion layer by blocking the penetration of oxygen and moisture. This inert barrier environment prevents oxidative damage and degradation of the quantum dot materials, ensuring long-term stability of their photoluminescence properties
2Reliability
If protection structures are added to protect quantum dots, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent employs thin film encapsulation layers (first encapsulation layer and second encapsulation layer) that provide effective protection against oxygen and moisture penetration. These thin film structures offer sufficient protective functionality while minimizing the additional structural complexity and maintaining a relatively compact device profile
3Duration of action of stationary object
If encapsulation layers are formed to protect light color conversion units, then durability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The encapsulation structure is divided into multiple segments: a first encapsulation layer and a second encapsulation layer formed at different stages of the manufacturing process. This segmentation allows each layer to be formed with moderate precision requirements individually, rather than requiring a single complex encapsulation step, thereby improving overall manufacturability while ensuring long-term durability
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 structure enhances the stability and reliability of the light color conversion layer, maintaining high luminance and color purity, and is applicable in mini LED, micro LED, and OLED devices.
Implementation Method 1
a first isolation layer continuously formed over the substrate and on the sidewalls of the separating components... a second isolation layer disposed on the first isolation layer and the light color conversion unit
Implementation Method 2
Quantum dots (QDs) are semiconductor nanoparticles, also known as nanocrystals (NC), which are able to perform light color conversion through photoluminescence (PL)
Data Source
AI summary
A light color conversion layer structure includes a pixel separation layer over a substrate. The pixel separation layer includes several separating components. The receiving region over the substrate is defined by adjacent separating components. The light color conversion layer structure also includes a first isolation layer continuously formed over the substrate and on the sidewalls of the separating components surrounding the receiving region. The first isolation layer continuously covers the top surface of the substrate and the sidewalls of the separating components adjacent to the receiving region. The light color conversion layer structure also includes a light color conversion unit within the receiving region and on the first isolation layer. The light color conversion layer structure further includes a second isolation layer on the first isolation layer and the light color conversion unit. The second isolation layer covers the first isolation layer and the light color conversion unit.