Light Detection Device With Segmented Color Filters
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Solution Overview
Problem
Conventional light detection devices face challenges in effectively separating infrared light from visible light, leading to inaccurate detection of light signals and color temperatures due to the influence of infrared components.
Innovation Solution
A light detection device is designed with a semiconductor substrate, multiple color filters, and an infrared cut filter, which allows for the preferential detection of visible light while attenuating infrared light, using distinct spectral characteristics to separate and detect light in different wavelength ranges, including visible and infrared light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an infrared cut filter is used to separate infrared light from visible light, then the detection accuracy of visible light signals is improved, but the device complexity increases due to the need for multiple filter layers
Solution Approach 1:
The patent divides the light detection function into separate regions: a first light receiving portion for visible light and a second light receiving portion for infrared light. Correspondingly, the color filter is segmented into a first region covering the visible light portion and a second region covering the infrared light portion, allowing each region to be optimized independently for its specific wavelength range.
Solution Approach 2:
Different spectral characteristics are applied to different regions of the color filter. The first region has spectral characteristics optimized for visible light transmission, while the second region has spectral characteristics optimized for infrared light transmission, enabling each local area to perform its specific detection function effectively.
2Measurement precision
If a multilayer infrared cut filter with approximately 50 layers of dielectric films is used, then the infrared light separation capability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
Instead of creating a single complex multilayer filter, the patent segments the filtering function into two separate regions on a single color filter substrate. This approach achieves infrared separation without requiring the complex assembly of approximately 50 dielectric layers, thereby simplifying the manufacturing process.
Solution Approach 2:
The patent changes the spectral characteristics of the color filter in different regions to achieve infrared light separation. By modifying the spectral transmission properties locally rather than using multiple physical layers, the manufacturing complexity is reduced while maintaining effective infrared separation capability.
3Measurement precision
If the infrared cut filter covers the entire sensor surface, then the visible light detection accuracy is improved, but the infrared light detection capability is lost
Solution Approach 1:
The color filter is divided into a first region and a second region, where the first region covers the visible light receiving portion and the second region covers the infrared light receiving portion. This segmentation allows the filter to selectively transmit visible light to the first portion and infrared light to the second portion, achieving both detection functions simultaneously.
Solution Approach 2:
Different regions of the color filter are assigned different spectral characteristics tailored to their specific detection purposes. The first region is optimized for visible light transmission while the second region is optimized for infrared light transmission, enabling the single filter structure to support dual-wavelength detection.
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 enables accurate detection of light signals and color temperatures with reduced infrared interference, allowing for precise calculation of illuminations and color temperatures with minimal error.
Implementation Method 1
a first color filter that covers the signal detection light receiving portion and that includes a first spectral characteristic such that the first color filter passes therethrough light in a first wavelength range within a wavelength range of visible light and in a wavelength range of infrared light
Implementation Method 2
an infrared cut filter that covers the signal detection light receiving portion and that includes an opening in a region opposite to the infrared light receiving portion
Implementation Method 3
signal detection light receiving portion that is formed in the semiconductor substrate, an infrared light receiving portion that is formed in the semiconductor substrate
Data Source
AI summary
A light detection device includes a semiconductor substrate, a signal detection light receiving portion, and an infrared light receiving portion. First and second color filters cover the signal detection light receiving portion and the infrared light receiving portion, respectively. The first color filter passes therethrough visible light in a first wavelength range as well as infrared light. The second color filter passes therethrough visible light in a second wavelength range as well as infrared light. A third color filter covers the infrared light receiving portion. The third color filter passes therethrough visible light in a third wavelength range different from the second wavelength range as well as infrared light. An infrared cut filter covers the signal detection light receiving portion and has an opening in a region opposite to the infrared light receiving portion.