Infrared Transmission Filter Composition for Low Noise
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Solution Overview
Problem
Current color filters for solid-state imaging devices face challenges in achieving low noise from visible light components while maintaining thin thickness, particularly for infrared transmission filters used in infrared sensors, which affects their performance.
Innovation Solution
A composition for color filters incorporating a bisbenzofuranone-based near-infrared transmitting black coloring agent is used to form an infrared transmission filter, allowing for low noise transmission of near-infrared rays even at a thin thickness of 0.5 µm, achieved through a specific formulation and processing method that includes coating, exposure, and development steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the thickness of the infrared transmission filter is decreased to achieve miniaturization, then the light-shielding property to visible light deteriorates, but the infrared transmission performance is improved
Solution Approach 1:
The patent changes the chemical composition parameters of the filter by incorporating specific dyes (cyanine dye, carbocyanine dye, or cyanine-like dye) with optimized molecular structures and absorption characteristics. This allows the filter to maintain effective visible light blocking at reduced thickness while preserving infrared transmission properties
Solution Approach 2:
The patent creates a composite filtering system by combining specific dye molecules with resin materials to form a radiation-sensitive composition. The dye-resin composite structure enables simultaneous optimization of visible light absorption and infrared transmission in a thin film configuration
2Use of energy by moving object
If a resin black matrix with high light transmittance in near infrared region is used, then the infrared transmission is improved, but the visible light shielding property is insufficient
Solution Approach 1:
The patent utilizes dyes with specific absorption spectra that selectively absorb visible light wavelengths while transmitting near infrared wavelengths. The cyanine, carbocyanine, and cyanine-like dyes exhibit this wavelength-selective absorption property, enabling the filter to appear dark (blocking visible light) while remaining transparent to infrared radiation
Solution Approach 2:
The patent optimizes the molecular structure parameters of the dye molecules to achieve desired spectral characteristics. By adjusting the conjugated system length and molecular composition of the cyanine-based dyes, the absorption spectrum is tuned to block visible light while maintaining infrared transmission
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 enables the formation of infrared transmission filters that effectively transmit near-infrared rays with minimal noise from visible light components, even at a thin thickness, enhancing the performance of infrared sensors.
Implementation Method 1
a resin black matrix which has a small light absorption in a wavelength region from near infrared to infrared and has a high light transmittance in this wavelength region
Implementation Method 2
an infrared transmission filter which is able to transmit an infrared ray (particularly, a near infrared ray)
Implementation Method 3
a composition for color filter containing a near-infrared transmitting black coloring agent... a step of exposing patternwise the infrared transmission composition layer, and a step of developing the exposed infrared transmission composition layer
Data Source
AI summary
By a composition for color filter containing a near-infrared transmitting black coloring agent, a composition for color filter capable of forming an infrared transmission filter which is able to transmit an infrared ray (particularly, a near infrared ray) in the state of low noise derived from the visible light component even when it has a very thin thickness (for example, thickness of 0.5 µm), and an infrared transmission filter and a production method of an infrared transmission filter using the same, and an infrared sensor can be provided.