Colored SPD Light Valves Using Mixed Optical Primary Nanoparticles
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Solution Overview
Problem
Current suspended particle device (SPD) light valves are limited to blue or white tinted states due to size effects and intrinsic absorption of suspended particles, restricting their practical applications, and existing dye-based solutions suffer from poor weather resistance and light stability.
Innovation Solution
A method to produce optical primary color nanoparticles by reacting nitrogen-containing heterocyclic carboxylic acid, halides, and phosphorus-containing compounds to create nanoparticles with specific shapes and alignments, allowing for a mixture that displays a variety of colors through controlled light absorption and scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dye molecules are added to change the colorfulness of the device, then the color variety is improved, but the weather resistance and light stability deteriorate
Solution Approach 1:
The patent extracts and removes the problematic dye molecules from the system, replacing them with intrinsically colored rod-shaped nanoparticles. This eliminates the stability issues associated with organic dyes while maintaining the color variety function through physical mixing of different colored particles rather than chemical dyes.
Solution Approach 2:
The patent employs composite materials by using rod-shaped nanoparticles with intrinsic colors (red, green, blue) as the light-modulating component instead of organic dye molecules. These composite nanoparticles provide both the desired color variety and the required weather resistance and light stability through their inorganic or polymer-based structures.
2Device complexity
If a single type of suspended particle is used, then the device structure is simple, but the color output is limited to blue or white
Solution Approach 1:
The patent segments the single particle type into multiple distinct rod-shaped nanoparticle types, each with a specific intrinsic color (red, green, blue). These segmented particle types can be independently prepared and then mixed in various proportions to achieve different colors, maintaining structural simplicity while expanding color versatility.
Solution Approach 2:
The patent applies local quality by giving different rod-shaped nanoparticles distinct intrinsic colors (red, green, blue) while maintaining the same basic rod morphology and size range. This allows each particle type to have a specialized optical property (color) while the overall system structure remains simple and uniform.
3Reliability
If rod-shaped particles with specific orientation are used to control light transmission, then the light modulation function is improved, but the color variety is restricted by intrinsic absorption
Solution Approach 1:
The patent changes the key parameter of particle color from being determined by intrinsic absorption of a single material to being determined by the composition ratio of multiple colored particles. By adjusting the proportions of red, green, and blue rod-shaped nanoparticles, any desired color can be achieved while maintaining the light modulation function through orientation control.
Solution Approach 2:
The patent uses composite materials by combining rod-shaped nanoparticles of different intrinsic colors (red, green, blue) in various ratios within the same suspension. This composite approach allows the system to achieve color variety through physical mixing while each individual particle type maintains its light modulation capability through orientation control.
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 method enables light valves to exhibit multiple colors in the visible spectrum, enhancing practicality and expanding application scope by overcoming monotonous color limitations and improving stability.
Implementation Method 1
reacting nitrogen-containing heterocyclic carboxylic acid, halides, and phosphorus-containing compounds to create nanoparticles with specific shapes and alignments
Implementation Method 2
changes the optical absorption, scattering and reflection of composites
Implementation Method 3
changes the optical absorption, scattering and reflection of composites
Implementation Method 4
based on the variation of orientation of rod-shaped particles upon the application of an external electric field
Implementation Method 5
all of the optical anisotropy, dielectricity and relaxation time of the nanoparticles (NPs) determine the properties of the suspended particle light valve
Data Source
AI summary
The present invention relates to production method for nanoparticles used for light valves of different colors, light valves of different colors and application thereof. The light values comprise: a first transparent substrate, a first transparent conductive layer, a light modulating layer, a second transparent conductive layer and a second transparent substrate, the light modulating layer comprises a dispersion liquid and a nanoparticle dispersed-phase dispersed in the dispersion liquid; The tinted states of the light valve are displayed as multiple different colors in the visible spectral region, the bright state is colorless and transparent, and the multiple different colors of the light valve are realized by mixing nanoparticles of same or different color to form a mixture in the form of the nanoparticle dispersed-phase.