Quantum Dot Projector Color Wheel for Wider Color Gamut
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Solution Overview
Problem
Laser illuminated projectors using yellow phosphor compounds face issues with degraded color gamut and fluorescence lifetime, leading to unsatisfactory image quality due to broad spectral emission and potential saturation in high power applications.
Innovation Solution
A projector color wheel comprising a substrate with a first film of quantum dots emitting light at a first wavelength and a second film emitting light at a second wavelength, where the first emission wavelength is larger than the second, utilizing quantum dots with narrow emission profiles and short fluorescence lifetimes to enhance color gamut and suitability for high power applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If yellow phosphor compounds are used in laser illuminated projectors, then the device can be manufactured with simple structure and low cost, but the color gamut is degraded and fluorescence lifetime is reduced leading to unsatisfactory image quality
Solution Approach 1:
The patent changes the material parameters by replacing yellow phosphor compounds with quantum dots that have specific emission wavelengths. The quantum dots are engineered with precise size and composition parameters to emit at specific wavelengths (e.g., 630nm for red, 530nm for green), thereby improving color gamut while maintaining manufacturing feasibility through colloidal synthesis methods.
Solution Approach 2:
The patent uses composite material structures where quantum dots are embedded in a polymer matrix or deposited as layered films on color wheel substrates. This composite approach combines the optical benefits of quantum dots with the mechanical properties of supporting materials, achieving both improved color quality and structural integrity.
2Device complexity
If yellow phosphor compounds are used for wavelength conversion, then the device structure remains simple, but saturation occurs in high power applications due to broad spectral emission and limited fluorescence lifetime
Solution Approach 1:
The patent changes the fluorescence lifetime parameter by selecting quantum dot materials with inherently shorter and more stable fluorescence lifetimes compared to yellow phosphor compounds. This parameter change enables the system to handle high power laser illumination without saturation, improving reliability while maintaining relatively simple device structure.
Solution Approach 2:
The patent applies local quality by using quantum dots with specific size distributions and material compositions tailored for different wavelength regions. By optimizing the local properties of quantum dots at different positions on the color wheel, the system achieves uniform performance across the entire color spectrum under high power conditions.
3Use of energy by stationary object
If laser diodes with narrow spectral range are used, then power consumption is reduced by 30-50% compared to xenon lamps, but speckling artifacts appear in the image
Solution Approach 1:
The patent changes the spectral width parameter by using quantum dots that emit at specific wavelengths with narrow full-width-at-half-maximum (FWHM) compared to broad-spectrum lamps. This parameter change allows the system to maintain low power consumption while the precise wavelength control of quantum dots reduces speckle effects through more monochromatic illumination.
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 improves color gamut and fluorescence lifetime, reducing saturation and enhancing image quality in high power applications by using quantum dots with specific emission profiles, resulting in better thermal behavior and increased light in the red spectral region.
Implementation Method 1
a first material including a plurality of first quantum dots of a first quantum dot type, the plurality of first quantum dots being configured to emit light according to a first emission profile with at least a first emission peak at a first emission wavelength when light of a predetermined wavelength incidents
Implementation Method 2
each of the first film and the second film includes a binding material
Data Source
AI summary
A projector color wheel, including:a substrate;a first film for changing a wavelength of light, provided on the substrate, including a first material including a plurality of first quantum dots of a first quantum dot type, the plurality of first quantum dots being configured to emit light according to a first emission profile with at least a first emission peak at a first emission wavelength when light of a predetermined wavelength incidents;a second film for changing a wavelength of light, provided on the substrate, including a second material, the second material being configured to emit light according to a second emission profile with at least a second emission peak at a second emission wavelength when light of the predetermined wavelength incidents;wherein each of the first film and the second film includes a binding material; andwherein the first emission wavelength is larger than the second emission wavelength.