Conductive Composite Pane With Nanoparticles for Neutral Reflection
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Solution Overview
Problem
Existing composite panes with electrically conductive coatings face challenges in achieving a neutral reflection color, particularly in the automotive sector, while maintaining low total solar transmittance and compliance with legal light transmittance requirements, which often result in undesirable reddish or ghost images.
Innovation Solution
A composite pane design incorporating an electrically conductive coating and a layer of selectively absorbing nanoparticles, arranged to filter out yellow and red light wavelengths, shifting the reflection color to blue-green, and optionally integrated within the thermoplastic intermediate layer, ensuring neutral coloration without altering the production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an electrically conductive coating is applied to achieve low total solar transmittance and heatability, then thermal comfort is improved, but the reflection color becomes reddish and visually unappealing
Solution Approach 1:
A layer of selectively absorbing nanoparticles is introduced as an intermediary between the electrically conductive coating and the external environment. This nanoparticle layer selectively absorbs light in the yellow and red wavelength regions (580-750 nm), filtering out the harmful reddish reflection color while allowing the conductive coating to maintain its thermal management function. The nanoparticles act as a mediator that modifies the optical appearance without compromising the thermal performance.
Solution Approach 2:
The invention changes the color characteristics of the coating system by adding nanoparticles that selectively absorb specific wavelength ranges. The nanoparticles absorb light in the yellow and red regions (580-750 nm), transforming the overall reflection color from reddish to a more neutral or blue-green appearance. This color modification is achieved through selective optical absorption rather than changing the conductive coating itself.
2Use of energy by moving object
If the electrically conductive coating is optimized for low total solar transmittance, then energy consumption is reduced, but the light transmittance may fall below legal requirements
Solution Approach 1:
The nanoparticle layer provides local optical filtering in the yellow and red wavelength regions (580-750 nm) without uniformly reducing transmittance across the entire visible spectrum. By targeting specific wavelength ranges rather than all wavelengths, the system can achieve low solar transmittance for thermal management while maintaining sufficient visible light transmittance to meet legal requirements of at least 70%.
3Object-generated harmful factors
If a layer of selectively absorbing nanoparticles is added to filter red light, then the reflection color becomes neutral, but the device complexity increases
Solution Approach 1:
The invention creates a composite coating structure combining the electrically conductive coating with a layer of selectively absorbing nanoparticles. This composite system integrates two functional materials: the conductive coating for thermal management and the nanoparticle layer for optical filtering. The combination achieves both thermal performance and neutral reflection color while maintaining a relatively simple overall structure that can be manufactured using existing processes.
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 effectively compensates for reddish reflections, providing a more neutral and visually appealing color impression, while maintaining high electrical conductivity and transparency, thus enhancing thermal comfort and reducing energy consumption.
Implementation Method 1
The layer of selectively absorbing nanoparticles has an absorption within the wavelength range of 580 nm to 750 nm. The layer of selectively absorbing nanoparticles absorbs electromagnetic radiation of one or more wavelengths within this wavelength range
Implementation Method 2
the coating can also be used as heatable coatings in that they are connected to a voltage source, so that a current flows through the coating
Implementation Method 3
More complex electrically conductive coatings for windshields are also known which are used, for example, as IR-reflecting coatings in order to reduce the heating of the vehicle interior
Data Source
AI summary
A composite pane having an electrically conductive coating includes an outer pane having an outer-side surface and an interior-side surface and an inner pane having an outer-side surface and an interior-side surface, wherein the interior-side surface of the outer pane and the outer-side surface of the inner pane are connected to one another by a thermoplastic intermediate layer, and wherein, between the interior-side surface of the outer pane and the outer-side surface of the inner pane, at least: the electrically conductive coating and at least one layer of selectively absorbing nanoparticles having an absorption within the wavelength range of 580 nm to 750 nm are arranged.