Quantum Dot Light Guide Module Sealing and Uniformity
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Solution Overview
Problem
Conventional quantum dot films in liquid crystal displays are susceptible to water vapor and oxygen, leading to ineffective color conversion in applications requiring higher reliability, such as automotive and outdoor displays.
Innovation Solution
A quantum dot light guide module with a transparent substrate featuring a rough first groove for the quantum dot layer, sealed by a transparent cover plate with a sealing adhesive layer, and optionally including diffusion and selective reflection layers to enhance light distribution and reflection, preventing water vapor and oxygen ingress and ensuring uniform quantum dot layer spreading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional QD films with two PET barrier films are used, then the structure is simple and easy to manufacture, but water vapor and oxygen can still penetrate to a certain extent, leading to QD material degradation in high-reliability applications
Solution Approach 1:
The patent uses a transparent cover plate with a sealing adhesive layer to create a flexible sealing structure that completely encloses the quantum dot layer. This sealing adhesive layer forms a hermetic seal between the cover plate and substrate, providing superior protection against water vapor and oxygen compared to conventional PET barrier films, while maintaining structural flexibility and transparency.
Solution Approach 2:
The patent creates an inert sealing environment by completely enclosing the quantum dot layer between the substrate and transparent cover plate using the sealing adhesive layer. This sealed structure isolates the QD material from external environmental factors (water vapor and oxygen), effectively creating a protected inert atmosphere that prevents degradation in high-reliability applications.
2Manufacturing precision
If a smooth groove surface is used, then the manufacturing process is simpler, but the quantum dot paste forms water drops due to high surface tension, resulting in uneven curing and non-uniform quantum dot layer
Solution Approach 1:
The patent applies surface roughening to the groove, creating a curved/irregular surface topology rather than a smooth flat surface. This rough surface with its curved micro-features reduces surface tension effects, preventing water drop formation in the quantum dot paste and ensuring uniform spreading and curing of the layer.
Solution Approach 2:
The patent changes the surface parameter of the groove from smooth to rough. This parameter change in surface texture fundamentally alters the wetting characteristics of the quantum dot paste, eliminating surface tension-induced water drop formation and achieving uniform quantum dot layer distribution during curing.
3Reliability
If the quantum dot layer is not properly sealed, then the device structure remains simple, but the QD material becomes ineffective or fails to convert color light when exposed to water vapor and oxygen
Solution Approach 1:
The patent employs a transparent cover plate with sealing adhesive layer as a flexible sealing shell that completely encloses the quantum dot layer. This sealing structure maintains color conversion effectiveness by preventing water vapor and oxygen contact with the QD material, while the flexible design allows for practical device assembly and manufacturing.
Solution Approach 2:
The sealing adhesive layer acts as an intermediary element between the substrate and transparent cover plate, creating a hermetic seal that protects the quantum dot layer. This intermediary sealing mechanism ensures color conversion effectiveness by isolating the QD material from harmful environmental factors without requiring complex sealing systems.
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 isolates water vapor and oxygen, preventing quantum dot layer failure and ensuring uniform spreading of the cured quantum dot layer, thereby maintaining light-emitting efficiency and color consistency in high-reliability displays.
Implementation Method 1
the quantum dot paste contacting with the rough surface will not be in water drops generated due to high surface tension
Implementation Method 2
a sealing adhesive layer is provided between the transparent cover plate and the transparent substrate, and the transparent cover plate is connected with the transparent substrate through the sealing adhesive layer
Implementation Method 3
The green QD material in the QD films will absorb blue light and turn into green light, while the red QD material can absorb blue light and turn into red light
Data Source
AI summary
A quantum dot light guide module includes a transparent substrate and a transparent cover plate. The transparent substrate has a first groove, an inner wall of the first groove is a rough surface, and the first groove is provided with a quantum dot layer formed by curing a quantum dot paste. The transparent cover plate covers on a surface of the transparent substrate where the first groove is configured, a sealing adhesive layer is provided between the transparent cover plate and the transparent substrate, and the transparent cover plate is connected with the transparent substrate through the sealing adhesive layer and covered the first groove. In such a way, water vapor and oxygen are effectively isolated and the failure problem of the quantum dot layer is avoided, and the quantum dot layer is distributed uniformly in the first groove.