Photochromic UV Detection Patch with Skin-Mimicking Cover
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Solution Overview
Problem
Current methods for determining UV protection from sunscreen are inaccurate, as they rely on estimated duration or time-based warnings, which do not account for varying wear rates due to activities and environments, leading to potential overexposure to UV light.
Innovation Solution
A device with a photo-responsive layer using photochromic materials that changes visual appearance in response to UV light exposure, combined with a skin-mimicking cover layer and adhesive layer, to indicate when sunscreen is no longer providing protection by transitioning between visual states based on UV exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If time-based warning systems or manufacturer duration estimates are used to determine UV protection, then the device complexity is reduced, but the measurement precision and reliability of UV protection indication deteriorate
Solution Approach 1:
The patent replaces mechanical/time-based warning systems with a photochromic material-based detection system. The photochromic material undergoes chemical transformation when exposed to UV light, providing direct visual feedback about actual UV exposure levels rather than relying on time estimates. This substitution of chemical/optical detection for mechanical timing resolves the contradiction by achieving high measurement precision through photochemical response while maintaining relatively simple device structure.
Solution Approach 2:
The patent utilizes color changes of photochromic material as the core detection mechanism. The material changes color or optical properties in direct response to UV light exposure, providing intuitive visual indication of protection status. This color-change mechanism enables precise measurement of UV exposure effects while keeping the device structure simple, effectively resolving the contradiction between device complexity and measurement precision.
2Ease of operation
If sunscreen wear rate is estimated using fixed time durations, then the ease of operation is improved, but the reliability of UV protection indication deteriorates due to varying wear rates from activities and environments
Solution Approach 1:
The device enables self-service detection by directly indicating when sunscreen protection is no longer effective through photochromic material response. The system automatically detects actual UV exposure conditions and provides visual feedback without requiring user estimation or manual timing. This self-service mechanism improves reliability by adapting to actual wear conditions while maintaining ease of operation through intuitive visual indication.
Solution Approach 2:
The patent implements a feedback mechanism where the photochromic material provides real-time visual information about UV exposure status. This feedback loop allows users to understand actual protection effectiveness based on environmental and activity-specific conditions rather than fixed time estimates. The feedback principle resolves the contradiction by enabling reliable, condition-adaptive indication while keeping the system easy to use through direct visual cues.
3Reliability
If a skin-mimicking cover layer with polysaccharide is added to simulate sunscreen wear, then the reliability of exposure detection is improved, but the device complexity increases
Solution Approach 1:
The patent employs composite materials by combining photochromic material with a skin-mimicking cover layer containing polysaccharide. This composite structure allows the device to simulate actual sunscreen wear behavior on skin, improving reliability by accounting for environmental and activity-specific wear rates. The composite material approach resolves the contradiction by integrating multiple functional properties (photochromic response, skin-like wear characteristics) into a unified structure that enhances reliability while maintaining reasonable device complexity.
Solution Approach 2:
The patent utilizes parameter changes in the photochromic material's optical properties in response to UV exposure. The material's chemical and optical parameters change dynamically based on actual UV dose received, enabling reliable detection of protection status. This parameter-change mechanism improves reliability by responding to actual exposure conditions while keeping the device structure relatively simple, effectively resolving the contradiction between reliability and device complexity.
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 device effectively indicates UV exposure by changing color or opacity, providing a visual cue when sunscreen is worn off or rendered ineffective, allowing for timely reapplication and reducing the risk of sunburn and skin damage.
Implementation Method 1
a photo-responsive layer including a photochromic material responsive to light at a predetermined wavelength between 10 nm and 400 nm
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A device for detecting exposure to light includes: a photo-responsive layer including a photochromic material; a skin-mimicking cover layer covering a first side of the photo-responsive layer; and an adhesive layer configured to couple a second side of the photo-responsive layer opposite the first side to a surface.