Electrochromic Polymer Smart Eyewear for Rapid Light Adaptation
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Solution Overview
Problem
Conventional photochromic sunglasses have slow response times, are temperature-dependent, and only react to UV radiation, making them unsuitable for varying light conditions and environments, while smart color change materials like electrochromic (EC) polymers offer rapid switching and memory functions but are costly and complex to produce.
Innovation Solution
Development of EC polymer-based smart eyewear with a smart lens member, voltage source, and support member, where the EC polymer changes transmittance states with applied voltage, allowing for variable light adjustment, including automatic switching via sensors and energy harvesting for portable power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If photochromic lenses are used to automatically adjust light transmittance, then the lenses can adapt to UV radiation, but the response time is slow (more than fifteen minutes to become completely transparent)
Solution Approach 1:
The patent replaces the passive photochemical system with an active electrochromic system that uses electrical voltage to control light transmittance. This substitution enables rapid switching (within seconds) compared to the slow thermal-driven photochromic response, while maintaining automatic adaptation through integrated light sensors and control circuits.
Solution Approach 2:
The invention implements a dynamic control system where the lens transmittance can be rapidly adjusted in real-time based on ambient light conditions detected by sensors. The electrochromic material responds instantly to voltage changes, allowing the system to adapt dynamically to varying lighting environments rather than following the slow passive response of photochromic materials.
2Adaptability or versatility
If photochromic lenses are used, then the lenses can change color in response to UV light, but they exhibit temperature dependency that prevents achieving deep tints in hot weather
Solution Approach 1:
The patent replaces the temperature-dependent photochemical reaction with an electrochromic system driven by electrical voltage. This substitution eliminates the temperature dependency issue, as the electrochromic material's response is controlled by electrical fields rather than thermal energy, ensuring consistent performance across different temperature conditions.
Solution Approach 2:
The invention changes the controlling parameter from temperature (in photochromic systems) to electrical voltage (in electrochromic systems). This parameter change allows precise control of light transmittance regardless of ambient temperature, as the electrochromic material responds to voltage applied across its layers rather than to thermal activation.
3Adaptability or versatility
If photochromic lenses are used, then the lenses can darken in response to UV radiation, but they do not respond to visible light and thus will not achieve deep tints when worn in a car where vehicle windows act as UV filters
Solution Approach 1:
The patent replaces the UV-specific photochemical response with a visible-light-responsive electrochromic system. The electrochromic material can be activated by visible light detected by photodetectors, and the system can achieve deep tints by applying voltage regardless of UV presence, making it effective both inside and outside vehicles.
Solution Approach 2:
The invention incorporates light sensors that detect ambient visible light conditions and provide feedback to a control system. This feedback mechanism allows the system to automatically adjust the voltage applied to the electrochromic material, achieving appropriate tint levels based on actual visible light conditions rather than relying on UV radiation presence.
4Speed
If smart color change materials like SPD and LCD are used, then rapid switching is achieved, but high voltages are required to control light transmittance and production costs are high
Solution Approach 1:
The patent changes the operating voltage parameter from the high voltages required by SPD and LCD technologies to low voltages suitable for electrochromic polymers. This parameter change enables the use of simpler, less expensive power sources and control electronics, significantly reducing manufacturing costs while maintaining rapid switching performance.
Solution Approach 2:
The invention uses composite electrochromic polymer structures that combine multiple functional layers (electrochromic layer, electrolyte layer, electrode layers) to achieve rapid switching at low voltages. This composite material approach leverages the advantages of polymer flexibility and electrochromic speed while avoiding the high-voltage requirements of inorganic EC materials.
5Adaptability or versatility
If inorganic EC materials like WO3 are used, then color change is achieved, but response times are slow (on the order of tens of seconds) and processing costs are high
Solution Approach 1:
The patent uses composite electrochromic polymer materials that combine organic electrochromic compounds with conductive polymers and electrolytes. This composite structure enables faster ion transport and electron transfer compared to inorganic materials, achieving response times in the order of seconds rather than tens of seconds, while also reducing processing costs.
Solution Approach 2:
The invention substitutes inorganic EC materials with organic electrochromic polymers. This substitution provides several advantages: faster response times due to better ion mobility in polymer matrices, lower processing temperatures, flexibility in device design, and reduced manufacturing costs while maintaining effective color change capability.
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 EC polymer-based smart eyewear provides rapid, energy-efficient, and repeatable light transmittance adjustments, suitable for diverse lighting conditions, with low production costs and rich color options, enhancing user comfort and functionality.
Implementation Method 1
Electrochromic (EC) materials can change their color when an electrical potential is applied, due to electrochemical oxidation and reduction reactions occurring within the materials.
Implementation Method 2
Photochromic lenses incorporate light sensitive molecules into the lens (or into a film applied to the lens). Such light sensitive molecules cause the lenses to become less transparent when exposed to ultra-violet (UV) radiation.
Data Source
AI summary
Eyewear exhibiting a variable light transmittance functionality is achieved by including a smart lens incorporating an electrochromic (EC) polymer, switchable between a first state and a second state in response to a voltage selectively applied thereto. The smart eyewear includes the smart lens, a voltage source, and a support. The EC polymer transmits more light in the first state than in the second state, because changing the state of the EC polymer varies the light transmittance of the smart lens. The voltage source is configured to provide the voltage required to switch the EC polymer between the first state and the second state, while the support member is configured to support the smart lens and enable a user to wear the smart eyewear. Embodiments can include sensors and controllers to automate the switching, as well as energy harvesting elements to increase battery life.