Active Color-Changing Liquid Crystal Filament with Conductive Core
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Solution Overview
Problem
Existing technologies do not provide a fully controllable, full-spectrum color-changing filament that can be electrically activated, specifically lacking a conductive filament coated with a liquid crystal layer capable of visible color change across the entire spectrum and a black background for enhanced visibility.
Innovation Solution
A method involving a resistive conductive filament coated with a black backing layer, a chiral-nematic liquid crystal layer, and a transparent protective layer, which can be connected to a source of electric current to control temperature and induce color changes across the visible spectrum, utilizing a free meniscus coating process to achieve thin, uniform coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid crystal layer is coated on a non-conductive filament, then the liquid crystal can change color in response to temperature, but the filament cannot be electrically activated to control the color change
Solution Approach 1:
The invention uses a composite filament structure combining a conductive core (metal wire or carbon fiber) with a liquid crystal coating layer. This composite structure provides both electrical conductivity for active control and thermochromic color change capability, resolving the contradiction between color change functionality and electrical controllability
2Device complexity
If a liquid crystal layer is coated on a filament without a black background, then the structure is simpler, but the color change visibility is reduced
Solution Approach 1:
The invention applies a black backing layer specifically at the core of the filament where the liquid crystal coating is applied. This localized black background enhances the visibility of color changes in the liquid crystal layer by providing contrast, while not adding unnecessary complexity to the overall filament structure
3Adaptability or versatility
If a thick liquid crystal layer is coated on the filament, then the color change effect is more pronounced, but the coating process becomes more difficult and the layer is less uniform
Solution Approach 1:
The invention applies a black backing layer first as a preliminary step before coating the liquid crystal layer. This preliminary black layer provides a uniform substrate that facilitates subsequent liquid crystal coating, enabling better control over coating thickness and uniformity while still achieving pronounced color change effects
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
Enables a fully controllable, full-spectrum color-changing filament that can be woven into fabrics, allowing for dynamic color changes from red to violet, with precise temperature control and minimal power consumption, suitable for textile applications.
Implementation Method 1
resistive conductive filament adapted to be connected to a source of electric current
Implementation Method 2
chiral nematic liquid crystals—sometimes referred to as cholesterics—tend to align in a helical manner as a result of chiral moieties attached to the nematic liquid crystal molecular structure. Of particular interest is the ability of these materials to change color in response to a temperature change.
Data Source
AI summary
A color-changing filament or yarn is provided that delivers fully-controllable full-spectrum response to current input. In embodiments, the filament is adapted to be woven into a textile and controlled to vary and maintain color independently of external temperature.