Infrared Color Filter Array for Dual-Band Near-IR Imaging
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Solution Overview
Problem
Existing solid-state imaging devices are unable to perform high-level imaging with infrared rays, as they only have color filters for visible light and a single infrared filter, which limits their capability in applications such as distance measurement and biological monitoring.
Innovation Solution
The implementation of a solid-state imaging device with a configuration of multiple color filters that include two infrared filters, which divide the near-infrared region into two wavelength bands, allowing for selective transmission and shielding of light in specific bands, enabling high-level imaging with infrared rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single infrared transmitting filter is used, then the device structure is simple, but high-level infrared imaging cannot be performed
Solution Approach 1:
The near-infrared region is divided into two wavelength bands (first and second wavelength bands), and corresponding first and second infrared transmitting filters are provided to selectively transmit different wavelength bands. This segmentation enables multi-band infrared imaging capability while maintaining a relatively simple filter array structure.
2Adaptability or versatility
If multiple infrared filters are added to enable high-level infrared imaging, then infrared imaging capability is improved, but device complexity increases
Solution Approach 1:
The color filter array and infrared transmitting filter array are integrated into a unified filter structure where color filters and infrared transmitting filters are arranged in corresponding pixel units. This merging allows the device to perform both color imaging and multi-band infrared imaging functions simultaneously without requiring separate filter systems.
3Illumination intensity
If color filters for visible light are used, then visible light imaging is achieved, but infrared transmission is blocked
Solution Approach 1:
Different filters within the same pixel unit have different spectral transmission characteristics. Color filters transmit specific visible light wavelengths while blocking infrared, whereas infrared transmitting filters block visible light while transmitting infrared wavelengths. This local differentiation enables selective transmission based on the imaging mode (visible or infrared).
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
This configuration allows for high-level imaging with infrared rays, enhancing the device's capability in applications like distance measurement and biological monitoring by effectively separating and transmitting infrared signals.
Implementation Method 1
the first infrared color filter shields light in a visible region, transmits at least a part of light in the specific wavelength band 1, and shields light in the specific wavelength band 2
Implementation Method 2
the second infrared color filter shields light in the visible region, shields light in the specific wavelength band 1, and transmits at least a part of light in the specific wavelength band 2
Implementation Method 3
a photoelectric conversion device having a sensitivity to visible light and light at a wavelength of 700 to 900 nm
Data Source
AI summary
A structure and a solid-state imaging device, each of which enables high-level imaging by infrared rays. The structure is provided with a plurality of color filters positioned on a support, in which the color filters include a first infrared color filter and a second infrared color filter. When a near-infrared region is divided into two parts, a short wavelength side is defined as a specific wavelength band 1, and a long wavelength side is defined as a specific wavelength band 2, the first infrared color filter shields light in a visible region, transmits at least a part of light in the specific wavelength band 1, and shields light in the specific wavelength band 2, and the second infrared color filter shields light in the visible region, shields light in the specific wavelength band 1, and transmits at least a part of light in the specific wavelength band 2.