Trapezoidal Electro-Thermal Window Plate with Segmented Film
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Solution Overview
Problem
In electro-thermal windows with trapezoidally shaped transparent conductive films, the uneven distance between bus bars can lead to localized high temperatures and reduced transmission of vertically polarized electromagnetic waves.
Innovation Solution
The transparent conductive film is divided into regions by slits, with varying bus bar distances and widths to distribute electric current evenly and form a frequency selective surface for enhanced electromagnetic wave transmission, preventing local overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the transparent conductive film is formed with a trapezoid shape to match the window plate, then the window plate can provide effective coverage and aesthetic integration, but the distance between bus bars becomes uneven causing electric current concentration and local overheating
Solution Approach 1:
The transparent conductive film is divided into multiple independent heating zones by forming insulating slits that extend from one bus bar to the other. This segmentation prevents electric current concentration in specific areas, distributing the heating more uniformly across the trapezoidal surface while maintaining the overall trapezoid shape for aesthetic integration.
Solution Approach 2:
Different regions of the transparent conductive film are designed with different widths to compensate for the uneven bus bar spacing. Regions with shorter bus bar distances have greater widths, creating more heating elements in those areas, while regions with longer distances have narrower widths. This local quality adjustment balances the heat distribution across the entire trapezoidal surface.
2Reliability
If a transparent conductive film is formed to enable heating function, then de-misting capability is improved, but transmission of electromagnetic waves becomes difficult
Solution Approach 1:
Insulating slits are formed to divide the transparent conductive film into multiple separate heating zones. These slits create gaps that allow electromagnetic waves to pass through while the segmented conductive regions maintain sufficient heating capability for de-misting functions.
Solution Approach 2:
The transparent conductive film is designed with a porous or slit-filled structure that allows electromagnetic waves to penetrate through the material. The slits act as transmission channels for electromagnetic waves while the conductive regions between slits provide the necessary heating function.
3Temperature
If the transparent conductive film is divided into multiple regions by slits to distribute electric current evenly, then local overheating is prevented, but the device complexity increases
Solution Approach 1:
The transparent conductive film is segmented into multiple heating zones by forming insulating slits that extend from one bus bar to the other. This segmentation prevents electric current concentration in specific areas, distributing the heating more uniformly across the trapezoidal surface while maintaining the overall trapezoid shape for aesthetic integration.
4Illumination intensity
If the bus bar distance is reduced to improve electromagnetic wave transmission, then transmittance is improved, but the heating effectiveness decreases
Solution Approach 1:
Different regions of the transparent conductive film are designed with different widths to compensate for the uneven bus bar spacing. Regions with shorter bus bar distances have greater widths, creating more heating elements in those areas, while regions with longer distances have narrower widths. This local quality adjustment balances the heat distribution across the entire trapezoidal surface.
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
This design prevents local overheating and maintains high transmittance of vertically polarized electromagnetic waves, ensuring effective de-misting and communication while minimizing temperature hotspots.
Implementation Method 1
When the transparent conductive film is energized, the transparent conductive film generates heat, so that fog (water droplets) or the like created on the plate for the window can be removed.
Implementation Method 2
The transparent conductive film, by way of the plurality of slits, forms a frequency selective surface through which a vertically polarized electromagnetic wave of a predetermined frequency band is transmitted
Data Source
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AI summary
A plate for an electro-thermal window includes a transparent conductive film that can be heated, and multiple bus bars that feed power to the transparent conductive film. The multiple bus bars include a left bus bar connected to a left side edge part of the transparent conductive film and a right bus bar connected to a right side edge part of the transparent conductive film. The transparent conductive film is divided into multiple regions by a slit that is continuously or discontinuously formed from the left bus bar to the right bus bar. The multiple regions include a first region and a second region. A distance between the left bus bar and the right bus bar of the first region is shorter than a distance between the left bus bar and the right bus bar of the second region. A width of the first region in a direction orthogonal to the slit is shorter than a width of the second region in the direction orthogonal to the slit.