Color Filter Absorbance Ratio for Near-Infrared Noise Reduction
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Solution Overview
Problem
Existing color filters lack sufficient light shielding properties for visible rays, particularly when used with near-infrared light sources, leading to noise generation and performance deterioration in sensors.
Innovation Solution
A coloring composition with a specific absorbance ratio and comprising pyrrolopyrrole colorant compounds, along with other colorants, is used to form a color filter that allows near-infrared transmission while minimizing visible ray noise, achieved through a specific absorbance ratio and the inclusion of pyrrolopyrrole colorants with defined chemical structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional color filters are used, then visible light transmission is achieved, but near-infrared light shielding is insufficient causing noise
Solution Approach 1:
The patent applies parameter changes by carefully selecting and combining specific colorants with defined absorption characteristics. The composition uses colorants where the sum of absorption coefficients at 610nm and 780nm divided by the absorption coefficient at 940nm falls within 0.15-0.60, optimizing the balance between visible light transmission and near-infrared light shielding to eliminate noise while maintaining reliability
Solution Approach 2:
The patent employs composite materials by formulating a coloring composition that combines multiple colorants (including cyan, magenta, yellow, and black colorants) with specific absorption properties. This composite approach creates a synergistic effect where the combination of colorants achieves superior near-infrared shielding while maintaining visible light transmission, directly resolving the contradiction between noise reduction and reliability
2Reliability
If colorants with high visible light absorption are used, then visible light shielding improves, but near-infrared light transmission is reduced
Solution Approach 1:
The patent applies local quality by selecting colorants with specific absorption characteristics at different wavelength regions. The composition ensures that colorants have appropriate absorption coefficients at 610nm, 780nm, and 940nm, creating localized optimization where visible light regions maintain transmission while near-infrared regions achieve shielding, preventing noise generation
3Manufacturing precision
If a coloring composition layer with 30% transmittance at 600nm is formed, then color separability improves, but transmittance at other wavelengths may not be sufficient
Solution Approach 1:
The patent extends parameter changes to multiple wavelength points, specifying that when transmittance at 600nm is 30%, the composition must also achieve transmittance of 15% or less at 400nm, 10% or less at 550nm, 70% or more at 700nm, and 50% or more at 800nm. This multi-parameter optimization ensures both color separability and comprehensive spectral transmittance characteristics
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 effectively forms a color filter that transmits near-infrared rays with minimal visible ray noise, enhancing the performance of sensors and imaging devices by improving light shielding properties.
Implementation Method 1
a ratio A/B of a minimum value A of an absorbance in a wavelength range of 400 to 830 nm to a maximum value B of an absorbance in a wavelength range of 1000 to 1300 nm is 4.5 or higher
Data Source
AI summary
A coloring composition includes colorants and a resin, in which a ratio A/B of a minimum value A of an absorbance in a wavelength range of 400 to 830 nm to a maximum value B of an absorbance in a wavelength range of 1000 to 1300 nm is 4.5 or higher.