Curved Multilayer Filter for Color Reproducibility
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Solution Overview
Problem
At high image heights on the image plane, the principal ray enters the multilayer filter obliquely, leading to potential deterioration in color reproducibility.
Innovation Solution
A light detection device featuring a multilayer filter with a stacked structure of high- and low-refractive-index layers, convexly curved toward a semiconductor layer with photoelectric conversion regions arranged in a two-dimensional array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a flat multilayer filter is used, then the device structure is simple, but color reproducibility deteriorates at high image heights due to oblique light entry
Solution Approach 1:
The multilayer filter is designed with a convex curvature toward the semiconductor layer, transforming the flat surface into a curved one. This curvature ensures that oblique principal rays from high image height positions can enter the filter more perpendicularly, reducing wavelength shifts and maintaining color reproducibility across the entire image plane while preserving the fundamental multilayer filter structure
2Manufacturing precision
If the multilayer filter is made convexly curved, then color reproducibility is maintained at high image heights, but the device structure becomes more complex
Solution Approach 1:
The curvature radius of the multilayer filter is specifically optimized to be 1 mm to 100 mm, creating a localized geometric modification that addresses the oblique light entry problem at high image heights without requiring a complete redesign of the entire device structure. This localized curvature application balances performance improvement with structural simplicity
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 suppresses deterioration in color reproducibility by ensuring the principal ray enters the multilayer filter at near-vertical angles, maintaining image quality at high image heights.
Implementation Method 1
a multilayer filter having a stacked structure in which a high-refractive-index layer and a low-refractive-index layer are alternately stacked, and having a transmission spectrum specific to the stacked structure
Implementation Method 2
a multilayer filter having a stacked structure in which a high-refractive-index layer and a low-refractive-index layer are alternately stacked, and having a transmission spectrum specific to the stacked structure
Implementation Method 3
a semiconductor layer that allows light having passed through the multilayer filter to enter therein and has a plurality of photoelectric conversion regions arranged in a two-dimensional array
Data Source
AI summary
Provided is a light detection device in which deterioration in color reproducibility is suppressed. The light detection device includes a multilayer filter having a stacked structure in which a high-refractive-index layer and a low-refractive-index layer are alternately stacked, and having a transmission spectrum specific to the stacked structure; and a semiconductor layer that allows light having passed through the multilayer filter to enter therein and has a plurality of photoelectric conversion regions arranged in a two-dimensional array. The multilayer filter as a whole is convexly curved toward the semiconductor layer.