Stacked Nanocarbon Light Control Device Eliminates Wavelength Dependence
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Solution Overview
Problem
Existing light control devices in imaging elements exhibit wavelength dependence in light transmittance, which complicates the control of light incidence and affects the dynamic range of imaging devices.
Innovation Solution
A light control device with stacked nanocarbon film layers, including a first nanocarbon film, intermediate layers, and dielectric material layers, where a voltage is applied to control light transmittance, and a p-n junction is formed at the interface between doped nanocarbon films to determine the wavelength band for high transmittance, ensuring no wavelength dependence and rapid change in transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electrochromic film is used to control light transmittance, then the light transmittance can be changed from a first transmittance to a second transmittance in accordance with the applied voltage, but the light transmittance exhibits wavelength dependence which complicates control
Solution Approach 1:
The light control device is divided into multiple stacked light control layers (M≥1), where each layer contains a first nanocarbon film and a second nanocarbon film with different doping types (n-type and p-type). This segmentation allows independent control of different wavelength bands through the p-n junction structure, eliminating the wavelength dependence problem of conventional electrochromic films while maintaining voltage-controlled transmittance adjustment capability.
Solution Approach 2:
The invention uses composite nanocarbon film structures with different doping types (n-type and p-type) stacked together to form a light control layer. This composite structure creates a p-n junction that enables wavelength-independent transmittance control, combining the advantages of both doping types to achieve reliable control across different wavelengths without the limitations of single-material electrochromic films.
2Ease of operation
If conventional electrochromic films are used, then light transmittance can be controlled, but the time required for change in light transmittance is long
Solution Approach 1:
The invention replaces the conventional electrochromic film mechanism with a nanocarbon film-based light control mechanism. The nanocarbon films with different doping types respond much faster to voltage changes, eliminating the slow response time characteristic of electrochromic films while maintaining the voltage-controlled transmittance adjustment function.
3Measurement precision
If multiple light control layers are stacked to eliminate wavelength dependence, then transmittance control precision is improved, but device complexity increases
Solution Approach 1:
The invention merges the first nanocarbon film and second nanocarbon film into a single integrated light control layer structure with M≥1 stacked layers. Each layer contains both n-type and p-type doped nanocarbon films forming a p-n junction, which collectively eliminates wavelength dependence while achieving precise transmittance control. This merging approach reduces the complexity that would result from using separate control mechanisms for different wavelength bands.
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 allows for precise control of light transmittance across various wavelengths, reducing power consumption and enhancing the dynamic range of imaging devices by eliminating wavelength dependence and achieving quick changes in light transmittance.
Implementation Method 1
A voltage is applied to the first nanocarbon film and the second nanocarbon film... the light transmittance changes from a first transmittance to a second transmittance in accordance with the applied voltage
Implementation Method 2
a p-n junction is formed at the interface between doped nanocarbon films to determine the wavelength band for high transmittance
Data Source
AI summary
A light control device according to the present disclosure includes: stacked M (provided that M≥1) light control layers 113M in each of which a first nanocarbon film 114, a first intermediate layer 117A, a dielectric material layer 116, and a second intermediate layer 117B are stacked; and a second nanocarbon film 115formed on the second intermediate layer 117B included in an M-th light control layer 113M. A voltage is applied to the first nanocarbon film 114 and the second nanocarbon film 115.