Vehicle Window Heating Sticker With Segmented Transparent Heater
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Solution Overview
Problem
Traditional vehicle defoggers with embedded metal wires or transparent conductive films suffer from uneven heat distribution, prolonged defogging times, and potential glass damage due to thermal stress, as well as visibility issues when metal wires are exposed.
Innovation Solution
A heating sticker with a protective layer, a thermogenic layer made of transparent carbon nanobuds, an electrode layer with conductive and ground wires, and an adhesive layer, featuring insulative grooves and micro blocks for even heat distribution and high conductivity, ensuring rapid defogging without damaging the windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conductive films are used instead of metal wires, then visibility and appearance are improved, but heating uniformity deteriorates
Solution Approach 1:
The heating area is divided into multiple regions by insulative grooves that partition the conductive film into separate heating zones. This segmentation prevents current concentration in specific areas and distributes heat generation more uniformly across the entire heating surface, resolving the uneven heating problem while maintaining transparency.
Solution Approach 2:
Different regions of the conductive film are given different functional qualities through the insulative grooves pattern. The grooves create localized heating zones with optimized current distribution, ensuring each region contributes appropriately to overall uniform heating while maintaining the transparent appearance of the film.
2Reliability
If heating wires are arranged in parallel, then defogging function is achieved, but defogging time is prolonged due to thermal conduction requirements
Solution Approach 1:
The patent replaces traditional metal wire heating elements with a transparent conductive film that generates heat through electrothermal conversion across its entire surface area. This substitution eliminates the need for thermal conduction between discrete wire elements, enabling simultaneous heating of the entire windshield surface and dramatically reducing defogging time while maintaining reliable defogging function.
3Illumination intensity
If ITO conductive strips are used, then transparency is improved, but reliability deteriorates due to fragility and poor ductility
Solution Approach 1:
The patent uses a composite structure consisting of a flexible substrate combined with transparent conductive film material. This composite construction provides the mechanical flexibility and durability needed to withstand windshield curvature and installation stresses while maintaining the optical transparency and electrothermal conversion properties of the conductive film, resolving the reliability issue without sacrificing transparency.
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 heating sticker provides even heat distribution across the vehicle window, reducing defogging time and preventing glass damage, while maintaining clarity and safety by using a flexible and conductive carbon nanobud-based thermogenic layer with insulative grooves and micro blocks.
Implementation Method 1
When the conductive wire and the ground wire are electrified, the heating area will be heated by the electrothermal conversion
Implementation Method 2
The insulative grooves in the heating area guide the current distribution to make the heat from the electrothermal conversion evenly distributed onto the whole heating area
Data Source
AI summary
A heating sticker includes a protective layer, a thermogenic layer, an electrode layer, a cover layer and an adhesive layer, which are superposed in order. The thermogenic layer is a conductive film with transparent carbon nanobuds and defined with a heating area and a non-heating area. The heating area is disposed with insulative grooves. The non-heating area is distributed with micro blocks which are arranged insulatively. The electrode layer has a conductive wire and a ground wire. The conductive wire surrounds the heating area in a non-closed shape. The ground wire is located between the front end and the rear end of the conductive wire and connected to a periphery of the heating area. Conductivity of each of the conductive wire and the ground wire is higher than conductivity of the thermogenic layer. An outer surface of the cover layer is a modified surface which is treated with plasma.