Optical Modifier Barrier Layer Density for Delamination Resistance
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Solution Overview
Problem
Current quantum-dot display devices face challenges in achieving high reliability due to delamination issues in optical modifiers, which affect the durability and optical efficiency of the display devices.
Innovation Solution
The implementation of a barrier layer with a density ranging from 1.50 g/cm3 to 3.0 g/cm3, composed of silicon nitride or silicon oxide, is used to encapsulate the color controller, including quantum dots, and is spaced apart from the color controller with a low refractive layer, enhancing the structural integrity and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a low refractive index material is used for the optical modifier to improve optical efficiency, then optical efficiency is improved, but delamination occurs reducing reliability
Solution Approach 1:
A barrier layer is introduced as an intermediary between the color controller and the low refractive index optical modifier. This barrier layer prevents direct contact between the quantum dots and the low refractive index material, eliminating the delamination issue while preserving the optical efficiency benefits of the low refractive index material.
Solution Approach 2:
The optical modifier is designed as a composite structure with multiple layers including a barrier layer and a low refractive index layer. This composite structure combines the optical efficiency of low refractive index materials with the adhesion and stability of the barrier layer, resolving the contradiction between optical performance and reliability.
2Reliability
If the barrier layer density is increased to improve durability, then durability is improved, but stress control becomes difficult
Solution Approach 1:
The density of the barrier layer is optimized within a specific range (1.50 g/cm³ to 3.0 g/cm³) to balance durability and stress control. By controlling the density parameter within this range, the barrier layer achieves sufficient mechanical strength and durability while maintaining manageable stress levels that prevent delamination.
Solution Approach 2:
The barrier layer is designed with specific local properties including controlled density, thickness (first inorganic layer ≥0.1 μm, second inorganic layer ≥0.3 μm), and material composition (silicon nitride or silicon oxide). These localized quality parameters ensure the barrier layer provides adequate protection and stress management at the critical interface between the color controller and optical modifier.
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
This configuration improves the reliability of the display device by preventing delamination and enhancing optical efficiency, thereby ensuring better durability and performance.
Implementation Method 1
a barrier layer encapsulating the color controller
Implementation Method 2
a low refractive layer spaced apart from the color controller with the barrier layer interposed between the color controller and the barrier layer
Data Source
AI summary
An optical modifier may include a color controller including quantum dots, a barrier layer encapsulating the color controller, and a low refractive layer spaced apart from the color controller with the barrier layer interposed between the color controller and the barrier layer. The barrier layer may have a layer density ranging from 1.50 g/cm3 to 3.0 g/cm3.