Colored Radiation-Sensitive Composition for Near-Infrared Transmission
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Solution Overview
Problem
Current color filters for solid-state image sensors lack sufficient light-shielding properties in the visible light region and adequate light-transmission properties in the near-infrared region, which hinders their performance in near-infrared applications and pattern formability.
Innovation Solution
A colored radiation-sensitive composition incorporating azo yellow or isoindoline yellow pigments and dioxazine violet pigments, with specific mass content ratios, provides effective light-shielding in the visible light region and enhanced light-transmission in the near-infrared region, improving spectral characteristics and pattern formability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a red colored composition containing C.I. Pigment Violet 23, a yellow pigment, and a red pigment is used to achieve near-infrared light transmission, then light-transmission properties in the near-infrared region are improved, but light-shielding properties in the visible light region deteriorate and pattern formability by UV light exposure deteriorates
Solution Approach 1:
The patent changes the specific parameters of the composition by specifying precise mass ratios of pigments (yellow pigment: red pigment = 1:0.3 to 1:0.7, and C.I. Pigment Violet 23: red pigment = 1:0.1 to 1:0.5) to achieve the desired spectral characteristics. This parameter optimization allows the composition to simultaneously provide adequate visible light shielding and near-infrared light transmission.
Solution Approach 2:
The patent uses a composite material system combining multiple pigments (yellow pigment, red pigment, and C.I. Pigment Violet 23) with a photopolymerizable composition. This composite approach allows the material to exhibit both light-shielding properties in the visible region and light-transmission properties in the near-infrared region, while also enabling UV-induced pattern formation.
2Manufacturing precision
If a light-shielding photosensitive resin composition is used to improve pattern formability, then pattern formability is improved, but light-transmission properties in the near-infrared region deteriorate
Solution Approach 1:
The patent optimizes the composition parameters by carefully selecting and ratioing specific pigments (yellow pigment, red pigment, and C.I. Pigment Violet 23) to achieve a balance between light-shielding capability for pattern formation and near-infrared light transmission. The specific mass ratios ensure adequate UV absorption for patterning while maintaining near-infrared transparency.
Solution Approach 2:
The patent employs a composite photopolymerizable composition containing multiple pigments with complementary spectral properties. This composite material system provides both the light-shielding necessary for UV-induced pattern formation and the near-infrared light transmission required for sensor applications.
3Measurement precision
If colored pixels are reduced in size to improve resolution, then resolution is improved, but noise increases
Solution Approach 1:
The patent optimizes the spectral characteristics of the photopolymerizable composition to achieve sharp color separation with well-defined transmission and blocking bands. This parameter optimization allows for reduced pixel size while maintaining signal-to-noise ratio through improved spectral selectivity.
Solution Approach 2:
The patent enables each colored pixel region to have optimized spectral properties through the use of the composition with specific pigment ratios. This allows each pixel to exhibit enhanced light-shielding in its non-transmission regions and improved light-transmission in its transmission region, improving resolution while reducing noise even at reduced pixel sizes.
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 composition ensures sufficient light-shielding in the visible light region and excellent light-transmission in the near-infrared region, enhancing the sensitivity and pattern formability of solid-state image sensors, particularly for near-infrared applications.
Implementation Method 1
the colored radiation-sensitive composition is then exposed to light and developed
Implementation Method 2
a colored radiation-sensitive composition containing any of red, green and blue colorants
Data Source
AI summary
A colored radiation-sensitive composition for a color filter that includes (A) a pigment, (B) a photopolymerization initiator, and (C) a polymerizable compound, in which the colored radiation-sensitive composition satisfies the following conditions: when a colored radiation-sensitive composition layer is formed from the colored radiation-sensitive composition such that spectral transmittance at 600 nm becomes 30%, the colored radiation-sensitive composition layer includes the following characteristics: (1) spectral transmittance at 400 nm is 20% or less; (2) spectral transmittance at 550 nm is 10% or less; (3) spectral transmittance at 700 nm is 70% or more; (4) a wavelength resulting in 50% spectral transmittance is in a range of from 650 nm to 680 nm; and (5) a film thickness of the colored radiation-sensitive composition layer is in a range of from 0.55 mum to 1.8 mum.