Light Control Body Visible Light Absorbing Layer Whitening Prevention
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Solution Overview
Problem
Light control bodies used in environments exposed to strong light for extended periods experience a reduction in light control performance or undergo whitening, with existing countermeasures like UV blocking not providing sufficient effects.
Innovation Solution
A light control body comprising a light control layer and a visible light absorbing layer with a visible light transmittance of 50% or lower at wavelengths of 380 to 780 nm, which prevents reduction in light control performance even under strong light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light control body is used in an environment exposed to strong light for a long period of time, then the light control performance is reduced or whitening occurs, but the initial light control performance is good
Solution Approach 1:
The patent divides the protective function into two separate layers: a UV light blocking layer that blocks ultraviolet light and a visible light absorbing layer that absorbs visible light. This segmentation allows each layer to specialize in blocking specific types of light that cause deterioration, thereby maintaining light control performance over extended periods of strong light exposure.
Solution Approach 2:
The visible light absorbing layer acts as an intermediary between the UV light blocking layer and the light control layer. It absorbs visible light before it reaches the light control layer, preventing visible light-induced deterioration while allowing the UV blocking layer to handle ultraviolet protection. This intermediary layer ensures comprehensive protection against both UV and visible light damage.
2Object-affected harmful factors
If only UV light blocking is implemented, then some protection is provided, but sufficient effects are not achieved
Solution Approach 1:
The patent applies different protective properties to different regions of the optical spectrum. The UV light blocking layer specifically targets ultraviolet wavelengths, while the visible light absorbing layer targets visible light wavelengths. This local quality approach ensures that each type of harmful light is blocked by a layer optimized for that specific wavelength range, providing comprehensive protection that maintains light control performance.
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 combination of a light control layer and a visible light absorbing layer effectively maintains light control performance by reducing the impact of visible light, preventing whitening, and ensuring consistent functionality in harsh light conditions.
Implementation Method 1
a visible light absorbing layer having a visible light transmittance Tv at a wavelength of 380 to 780 nm of 50% or lower
Implementation Method 2
a light control layer capable of controlling a light transmittance in a specific wavelength region with a stimulus such as voltage or temperature
Implementation Method 3
since a liquid crystal material has a light transmittance that changes according to the temperature, the use thereof enables control of the transmittance and reflectance of light
Implementation Method 4
Countermeasures for this, such as blocking of UV light, have been taken
Data Source
AI summary
The present invention provides a light control body and a light control windowpane which are capable of preventing reduction in light control performance even when used in an environment exposed to strong light for a long period of time. Provided is a light control body including: a light control layer; and a visible light absorbing layer having a visible light transmittance Tv at a wavelength of 380 to 780 nm of 50% or lower.