Segmented Quantum Dot Conversion Layers for Thin, Rigid Backlights
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Solution Overview
Problem
Conventional quantum dot films in display devices face issues with poor wavelength conversion efficiency due to the use of toxic heavy metals, leading to limited quantity and insufficient stiffness, which affects light color quality and thickness.
Innovation Solution
A wavelength conversion module with a substrate, barrier wall structural layer, and wavelength conversion layers containing quantum dot particles, where the barrier wall structural layer enhances stiffness and reduces thickness, and includes non-toxic wavelength conversion layers and optional fluorescent particles to enhance color saturation and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional quantum dot films are made thinner to reduce thickness, then the thickness parameter is improved, but the stiffness becomes insufficient
Solution Approach 1:
The quantum dot film is segmented into multiple independent quantum dot layers, each containing quantum dot particles dispersed in a resin layer. These layers are separated by barrier wall structures, creating a multi-layered configuration that maintains stiffness while reducing overall thickness. Each layer independently contributes to the optical function while the barrier walls provide structural support.
Solution Approach 2:
The patent uses composite materials by combining quantum dot particles with resin materials to form wavelength conversion layers. The barrier wall structures are also formed using composite adhesive materials that provide both structural support and optical transparency. This composite approach enables the film to achieve both thinness and sufficient stiffness through material composition rather than increasing overall thickness.
2Loss of energy
If conventional quantum dot films use toxic heavy metals to achieve wavelength conversion, then the wavelength conversion efficiency is improved, but the quantity of available quantum dots is limited due to toxicity
Solution Approach 1:
The patent changes the material parameters by replacing toxic heavy metal quantum dots with non-toxic alternative materials that exhibit similar or improved wavelength conversion properties. This parameter change allows for increased quantity of quantum dot particles to be used without the constraints of toxicity, thereby maintaining high conversion efficiency while expanding material availability.
Solution Approach 2:
The patent adopts non-toxic quantum dot materials that can be produced more abundantly and are not constrained by the same supply limitations as toxic heavy metals. These alternative materials can be manufactured in larger quantities and are environmentally friendly, effectively replacing the limited toxic quantum dot resources.
3Device complexity
If conventional quantum dot films use a single-layer structure, then the manufacturing process is simple, but the color quality and saturation are insufficient
Solution Approach 1:
The single-layer quantum dot film is segmented into multiple wavelength conversion layers, each potentially containing quantum dots with different size distributions or material compositions. This segmentation allows each layer to target specific wavelength ranges, improving overall color quality and saturation while maintaining a systematic manufacturing approach.
Solution Approach 2:
The patent merges multiple quantum dot layers with different optical characteristics into a single integrated structure. Each layer contributes different wavelength conversion properties, and their combined effect produces superior color quality and saturation that cannot be achieved by a single layer alone.
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
Improves wavelength conversion efficiency and reduces thickness while maintaining high color quality, even with limited quantum dot particles, by using a non-toxic design and structural reinforcement.
Implementation Method 1
quantum dots have the advantages of narrow full width at half maximum (FWHM), high light emission efficiency, a wide optical absorption spectrum
Implementation Method 2
disposing a first curable adhesive on a substrate, and curing the first curable adhesive to form a barrier wall structural layer
Data Source
AI summary
A wavelength conversion module includes a substrate, a barrier wall structural layer, a plurality of wavelength conversion layers and a plurality of quantum dot particles. The substrate has a surface. The barrier wall structural layer is disposed on the surface and defines a plurality of recesses. Each of the wavelength conversion layers is located in one of the recesses. The quantum dot particles are disposed in the wavelength conversion layers. A backlight module having the wavelength conversion module and a manufacturing method of the wavelength conversion module are also provided.