Optical Layered Body Blue Light Blocking
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Solution Overview
Problem
Conventional UV absorbers in image display devices fail to effectively block blue light without affecting the color tone of displayed images, as they do not adequately absorb light in the 380-495 nm range, leading to potential damage and deterioration of components.
Innovation Solution
An optical layered body with a specific structure, including a substrate and functional layers containing a sesamol-type benzotriazole monomer, achieves optimal blue light blocking by ensuring spectral transmittance of less than 1% at 380 nm, less than 10% at 410 nm, and 70% or higher at 440 nm, preventing blue light damage while maintaining image color integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional UV absorbers (benzotriazole copolymers) are added to substrates or optical functional layers, then light resistance is improved, but blue light absorption performance deteriorates (absorption wavelength range is limited to 300-360 nm, insufficient for blocking 380-495 nm blue light)
Solution Approach 1:
The patent modifies the molecular structure of benzotriazole derivatives by introducing specific substituents (such as electron-withdrawing groups at positions 5 and 6, or electron-donating groups at position 2) to shift the absorption wavelength range from 300-360 nm to 380-495 nm, enabling effective blue light blocking while maintaining light resistance
Solution Approach 2:
The patent uses composite material structures including: (1) combining multiple benzotriazole derivative compounds with different absorption characteristics, (2) integrating the UV absorber layer with other optical functional layers (polarizing plate, liquid crystal layer, color filter layer), and (3) using hybrid substrate materials to achieve both light resistance and broad-spectrum blue light absorption
2Object-affected harmful factors
If blue light blocking is enhanced to prevent retinal damage and component deterioration, then blue light absorption increases, but color tone of displayed images may be affected
Solution Approach 1:
The patent applies local quality by creating a spectral transmittance profile with different characteristics at different wavelengths: high absorption (low transmittance) in the 380-410 nm range to block harmful blue light, and high transmission in the 440-495 nm range to maintain color tone, achieving wavelength-selective optical properties
Solution Approach 2:
The patent carefully selects benzotriazole derivative compounds and their concentrations to achieve the desired spectral transmittance characteristics without introducing unwanted coloration, ensuring that the blue light blocking function does not adversely affect the color reproduction of displayed images
3Object-affected harmful factors
If spectral transmittance at 380 nm is reduced to less than 1% and at 410 nm to less than 10%, then blue light blocking is improved, but transmission of visible light (440 nm and above) must be maintained at 70% or higher
Solution Approach 1:
The patent segments the optical spectrum into different functional zones: (1) blocking zone at 380-410 nm with spectral transmittance <1% at 380 nm and <10% at 410 nm, (2) transmission zone at 440 nm and above with spectral transmittance ≥70%, achieved by designing benzotriazole derivatives with absorption peaks specifically positioned in the blocking zone while maintaining transparency in the transmission zone
Solution Approach 2:
The patent achieves dynamic spectral control by optimizing the molecular structure of benzotriazole derivatives to create a steep absorption edge, where the transmittance drops sharply from the blocking zone to the transmission zone, enabling precise control over the transition between high absorption and high transmission regions
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 optical layered body effectively blocks blue light below 410 nm while allowing significant transmission above 440 nm, preventing color tone alteration and addressing component degradation, thus providing excellent blue light blocking without affecting image display quality.
Implementation Method 1
a spectral transmittance at a wavelength 380 nm of lower than 1%, a spectral transmittance at a wavelength of 410 nm of lower than 10%
Implementation Method 2
a spectral transmittance at a wavelength of 440 nm of 70% or higher
Data Source
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Figure 3
AI summary
The present invention provides an optical layered body having excellent blue light blocking properties without affecting the color tone of displayed images. Provided is an optical layered body having a structure including: a substrate; and one or two or more functional layers on at least one surface of the substrate, the optical layered body having a spectral transmittance at a wavelength of 380 nm of lower than 1%, a spectral transmittance at a wavelength of 410 nm of lower than 10%, and a spectral transmittance at a wavelength of 440 nm of 70% or higher.