Quantum Dot Fluorescent Wavelength Conversion for Projector Brightness
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Solution Overview
Problem
Wavelength conversion using only quantum rods in projectors decreases light utilization efficiency, making it difficult to project a bright image.
Innovation Solution
A wavelength conversion element comprising a quantum dot layer and a fluorescent body layer, arranged in a specific order to convert light, improving light utilization efficiency and color purity by using quantum dots or quantum rods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only quantum rods are used for wavelength conversion, then the device complexity is reduced, but light utilization efficiency deteriorates
Solution Approach 1:
The patent combines quantum dots and quantum rods in a single wavelength conversion element, allowing both materials to work together to convert different portions of the excitation light spectrum. This merging approach improves light utilization efficiency by capturing a broader range of excitation wavelengths while maintaining manageable device complexity through integrated design.
Solution Approach 2:
The patent uses a composite structure combining quantum dots and quantum rods as wavelength conversion materials. This composite approach leverages the complementary properties of both materials - quantum dots for converting specific wavelengths and quantum rods for converting other wavelengths - thereby improving overall light utilization efficiency without significantly increasing device complexity.
2Ease of manufacture
If only quantum rods are used for wavelength conversion, then the manufacturing process is simplified, but image brightness deteriorates
Solution Approach 1:
The patent merges quantum dots and quantum rods in the wavelength conversion layer to convert multiple excitation wavelengths simultaneously. This combination converts a broader spectrum of excitation light into useful visible light, increasing overall image brightness while maintaining manufacturing feasibility through integrated material deposition processes.
Solution Approach 2:
The patent employs composite wavelength conversion materials comprising quantum dots and quantum rods to convert different excitation wavelengths into complementary color ranges. This composite approach increases total light conversion efficiency and image brightness while using manufacturing techniques similar to conventional single-material approaches.
3Device complexity
If only quantum rods are used for wavelength conversion, then the device structure is simplified, but color purity deteriorates
Solution Approach 1:
The patent applies local quality by assigning different wavelength conversion functions to different materials within the same layer. Quantum dots are optimized for converting specific excitation wavelengths to particular color ranges, while quantum rods handle other wavelength conversions. This localized functional differentiation improves color purity for each converted wavelength while maintaining overall structural simplicity.
Solution Approach 2:
The patent uses composite wavelength conversion materials where quantum dots and quantum rods each contribute to converting specific excitation wavelengths to distinct color ranges. This composite approach achieves superior color purity across the visible spectrum by leveraging the complementary emission characteristics of both materials while maintaining a unified layer structure.
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 enhances light utilization efficiency and color purity, allowing for the projection of brighter images by effectively converting and combining light wavelengths.
Implementation Method 1
quantum dots and rods converting a first light from a light source into a second light whose wavelength is different from that of the first light
Implementation Method 2
fluorescent body that converts the first light into a third light whose wavelength is different from that of the first light
Data Source
AI summary
The wavelength conversion element includes a quantum dot layer containing at least one of quantum dots and quantum rods, the quantum dots and rods converting a first light from a light source into a second light whose wavelength is different from that of the first light, and a fluorescent body layer containing a fluorescent body that converts the first light into a third light whose wavelength is different from that of the first light. The quantum dot layer and the fluorescent body layer are arranged in this order from a light entrance side on which the first light enters the wavelength conversion element or in reverse order. The second light and the third light exit from the quantum dot layer.