Low-Power Transparent Electro-Thermal Film with Interlocking Comb Electrodes
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Solution Overview
Problem
Existing transparent electro-thermal films require high supply voltage and multiple conductor layers, leading to high manufacturing costs, safety concerns, and uneven heating, limiting their practicality and portability.
Innovation Solution
A low-power transparent electro-thermal film device with a comb-shaped inter-locking electrode configuration and a transparent conductor layer, such as single-layer graphene, that allows for efficient heating using common lithium batteries and reduces voltage requirements, achieving even temperature distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If materials with high sheet resistance are used as the conductor layer, then the heating effect can be achieved, but the supply voltage has to be high which affects portability and safety
Solution Approach 1:
The electrode structure is segmented into multiple comb-shaped inner electrodes that inter-lock with each other. This segmentation allows the total resistance to be distributed across multiple smaller resistive elements, enabling effective heating at lower voltages while maintaining portability and safety
2Use of energy by moving object
If the thickness of the conductor layer is increased to lower the supply voltage, then the voltage requirement decreases, but manufacturing costs increase and productivity decreases
Solution Approach 1:
Instead of increasing conductor layer thickness, the patent segments the electrode into multiple thin comb-shaped layers that inter-lock. This achieves the voltage reduction goal while maintaining thin-film manufacturing advantages, avoiding increased material costs and preserving high productivity
3Power
If multiple layers of conductor layers (5-6 layers) are used to achieve low input power, then the power consumption decreases, but the temperature distribution becomes uneven with variance more than 60K
Solution Approach 1:
The comb-shaped inner electrodes create locally distributed heating zones throughout the transparent substrate. This local quality approach ensures uniform heat distribution across the entire device area, preventing the >60K temperature variance that occurs with simple multi-layer configurations
4Power
If new materials or patterned electrodes are used to reduce power, then the power consumption decreases, but heating distribution remains uneven
Solution Approach 1:
The electrode is segmented into inter-locking comb shapes that distribute current paths uniformly across the device. This segmentation geometry, combined with transparent conductor materials, achieves both low power consumption and uniform heating distribution simultaneously
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 enables efficient heating with low input power, achieving temperatures of 90-180°C using less than 12V, significantly reducing manufacturing costs and improving safety and practicality while maintaining device transparency.
Implementation Method 1
a current flowing through the conductor layer generates heat
Data Source
AI summary
A low-power transparent electro-thermal film device is provided. The device includes a transparent substrate, a transparent conductor layer disposed at least one side of the transparent substrate, and a plurality of inner electrodes disposed on the transparent conductor layer and including a first plurality of inner electrodes extending in a comb shape from a first electrode bus bar and a second plurality of inner electrodes extending in the comb shape from a second electrode bus bar. The first plurality of inner electrodes inter-lock with the second plurality of inner electrodes.