UV-Decolorizing Light Absorption Filters Without Cavity Defects
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Solution Overview
Problem
Existing light absorption filters require heating during ultraviolet irradiation to achieve decolorizing properties, which hinders productivity, and increasing the concentration of radical-generating compounds leads to defects like cavity formation.
Innovation Solution
A light absorption filter comprising a resin, a dye with a main absorption wavelength band in the 400 to 700 nm range, and a compound that generates a radical upon ultraviolet irradiation, where the polymer in the resin contains a crosslinkable group, and a compound A with an acid group and a compound B that forms a hydrogen bond with acid group are used, ensuring efficient decolorization at room temperature without cavity formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heating is applied during ultraviolet irradiation to achieve decolorizing properties, then decolorization efficiency is improved, but productivity deteriorates due to additional heating steps
Solution Approach 1:
The patent replaces the thermal field (heating) with a chemical field approach by using a photoinitiator that generates radicals upon ultraviolet irradiation. This substitution eliminates the need for heating equipment and thermal processing steps, thereby improving productivity while maintaining decolorization efficiency through photochemical reactions.
Solution Approach 2:
The patent changes the activation parameter from thermal energy (temperature) to optical energy (ultraviolet wavelength). By selecting a photoinitiator with appropriate absorption characteristics and using ultraviolet irradiation, the system achieves decolorization at room temperature, eliminating the productivity loss associated with heating operations.
2Reliability
If the concentration of radical-generating compounds is increased to improve decolorization, then decolorization efficiency is improved, but cavity formation defects occur
Solution Approach 1:
The patent introduces a resin as an intermediary medium that dissolves the photoinitiator and dye. This allows for optimal distribution and concentration control of the radical-generating compound, ensuring sufficient decolorization capability while preventing local aggregation that would cause cavity formation. The resin acts as a carrier that mediates between the photoinitiator and the substrate.
Solution Approach 2:
The patent creates a composite material system consisting of resin, photoinitiator, and dye. This composite structure allows the photoinitiator to be uniformly dispersed in the resin matrix, providing consistent radical generation throughout the filter layer without localized high concentrations that would lead to cavity defects, while still achieving effective decolorization.
3Reliability
If a light absorption filter is used to block unnecessary wavelengths, then optical performance is improved, but the filter structure becomes more complex
Solution Approach 1:
The patent makes the resin layer multi-functional by incorporating both the photoinitiator for decolorization and the dye for wavelength selection. This single layer simultaneously provides structural support, enables photochemical processing, and performs optical filtering, eliminating the need for separate layers and reducing overall device complexity while maintaining optical performance.
Solution Approach 2:
The patent merges the functions of the resin matrix, photoinitiator, and dye into a single integrated light absorption filter layer. This consolidation combines the structural role of the resin with the chemical functionality of the photoinitiator and the optical functionality of the dye, reducing the number of components and simplifying the device structure while achieving both decolorization and wavelength filtering.
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 proposed light absorption filter achieves excellent decolorizing properties at room temperature and prevents cavity formation even at high concentrations of radical-generating compounds, enhancing the productivity and reliability of optical filters.
Implementation Method 1
a compound that generates a radical upon ultraviolet irradiation
Implementation Method 2
a polymer that constitutes the resin contains a crosslinkable group
Implementation Method 3
a compound A with an acid group and a compound B that forms a hydrogen bond with acid group
Implementation Method 4
a dye with a main absorption wavelength band in the 400 to 700 nm range
Data Source
AI summary
A light absorption filter containing a resin, a specific dye, and a compound that generates a radical upon ultraviolet irradiation, in which a polymer constituting the resin contains a crosslinkable group, a light absorption filter containing a resin, a compound A having an acid group, a compound B that forms a hydrogen bond with the acid group contained in the compound A and generates a radical upon ultraviolet irradiation, and a specific dye, in which the compound A is contained in a side chain of a polymer constituting the resin, an optical filter using these light absorption filters and a manufacturing method thereof, and an organic electroluminescent display device, an inorganic electroluminescent display device, or a liquid crystal display device, each of which contains the optical filter.