Light-Absorbing Optical Filter Composition for Thin Low-Haze Imaging
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Solution Overview
Problem
Existing optical filters for imaging apparatuses and ambient light sensors, such as those described in Patent Literatures 1 to 3, face challenges in achieving both slimness and desired optical properties, particularly in terms of transmittance and haze, which are not adequately addressed by current technologies.
Innovation Solution
A light-absorbing composition comprising an alkoxysilane with a group having 10 or more carbon atoms, its hydrolysate, or a polymerization product, combined with a light-absorbing compound like a phosphonic acid and copper component, forming a light absorber with specific optical density and transmittance characteristics, and an optical filter with an antireflection film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the thickness of the light-absorbing layer is reduced to achieve slimness, then device thickness is reduced, but transmittance control and optical properties deteriorate
Solution Approach 1:
The patent uses a composite light-absorbing layer combining copper phosphonate (inorganic component) with specific organic dyes (organic component). This composite structure enables the thin layer to achieve both slimness and superior optical properties, as the synergistic combination provides enhanced light absorption efficiency and transmittance control compared to single-material layers.
Solution Approach 2:
The patent optimizes specific parameters including the thickness of the light-absorbing layer (50-150 μm), the concentration ratios of copper phosphonate to organic dye (1:4 to 4:1), and the specific wavelength range of organic dye absorption (400-700 nm). These parameter optimizations enable the thin filter to achieve maximum optical performance while maintaining slim profile.
2Ease of manufacture
If conventional light-absorbing materials are used, then manufacturing is simpler, but transmittance uniformity and color reproduction worsen
Solution Approach 1:
The patent achieves homogeneous distribution of copper phosphonate and organic dye throughout the light-absorbing layer, ensuring uniform transmittance across the entire filter surface. This homogeneity is critical for consistent color reproduction and is achieved through careful formulation and mixing processes that maintain material uniformity throughout the thin layer structure.
3Ease of manufacture
If phosphoric acid ester is used as light-absorbing material, then initial cost is lower, but weather resistance and durability worsen due to high hydrolyzability
Solution Approach 1:
The patent changes the chemical composition parameter from phosphoric acid ester to copper phosphonate, which has superior resistance to hydrolysis and weathering. This material substitution maintains manufacturing feasibility while dramatically improving the durability and long-term stability of the optical filter in various environmental conditions.
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 solution achieves a slim optical filter with improved transmittance matching human visual sensitivity and low haze, enhancing image quality and reducing device thickness.
Implementation Method 1
a light-absorbing composition including: at least one selected from the group consisting of an alkoxysilane (Formula 1) including a group having 10 or more carbon atoms, a hydrolysate of the alkoxysilane, and a polymerization product of a hydrolysate of the alkoxysilane
Implementation Method 2
a light-absorbing composition including: at least one selected from the group consisting of an alkoxysilane (Formula 1) including a group having 10 or more carbon atoms, a hydrolysate of the alkoxysilane, and a polymerization product of a hydrolysate of the alkoxysilane
Implementation Method 3
light-absorbing compound, the light absorber having an average transmittance in a wavelength range of 460 nm to 600 nm
Data Source
AI summary
A light-absorbing composition includes a silicon-containing compound α and a light-absorbing compound. The silicon-containing compound α is at least one selected from the group consisting of an alkoxysilane including a group α-1 having 10 or more carbon atoms and a hydrolysate of the alkoxysilane.