Light Detecting Device With Nanostructure Light-Dispersing Sections
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Solution Overview
Problem
Existing light detecting devices face challenges in achieving improved detection performance.
Innovation Solution
A photodetector comprising a plurality of pixels, including first pixels with a light-dispersing section and a first photoelectric conversion section, second pixels with a second photoelectric conversion section, and third pixels with a third photoelectric conversion section, where the light-dispersing section redirects light to the photoelectric conversion sections of different wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional pixel structure is used, then the device complexity is low, but the detection performance and sensitivity are insufficient
Solution Approach 1:
The pixel structure is segmented into distinct functional regions: first pixels with light-dispersing sections for one wavelength range, second pixels for another wavelength range, and third pixels for a third wavelength range. This segmentation allows each pixel type to be optimized for specific wavelength detection, improving overall detection performance while maintaining manageable complexity through functional specialization.
Solution Approach 2:
Different regions of the pixel structure are assigned different optical properties and functions. The light-dispersing sections in first pixels have specific structural characteristics optimized for their wavelength range, while second and third pixels have different photoelectric conversion characteristics. This local optimization of properties for specific functions enhances detection performance without requiring complete redesign of the entire pixel array.
2Measurement precision
If light-dispersing sections with nanostructures are added to pixels, then the sensitivity and resolution are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The light-dispersing sections utilize nanostructures with dimensions specifically optimized for their target wavelength ranges. By adjusting the size, shape, and spacing parameters of these nanostructures during design, the structure achieves high sensitivity and resolution for specific wavelengths. The manufacturing process benefits from well-defined parameter targets that can be optimized for production feasibility.
Solution Approach 2:
The patent introduces a vertical dimension to light manipulation by placing light-dispersing sections above the pixel array in a stacked configuration. This three-dimensional arrangement allows light to be dispersed and directed to specific pixel layers based on wavelength, achieving high resolution and sensitivity without requiring extremely precise lateral nanofabrication, thus moderating manufacturing precision requirements.
3Adaptability or versatility
If multiple pixel types for different wavelengths are integrated, then the versatility and detection capability across wavelength ranges are improved, but the device complexity increases
Solution Approach 1:
The pixel array is designed with multiple pixel types (first, second, and third pixels) that can detect different wavelength ranges within a single integrated structure. Each pixel type serves multiple functions: detecting its specific wavelength range, contributing to overall image formation, and working cooperatively with other pixel types. This multi-functionality approach enhances versatility without proportionally increasing complexity, as all pixel types share common structural elements and processing pathways.
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 photodetector achieves high detection performance by enhancing sensitivity and resolution, particularly in sensing light across different wavelength ranges.
Implementation Method 1
The light-dispersing section includes a structure having a dimension equal to or less than a wavelength of incident light
Implementation Method 2
The first photoelectric conversion section receives light of a first wavelength transmitted through the light-dispersing section to perform photoelectric conversion
Data Source
AI summary
A light detecting device comprises a plurality of pixels comprising a first pixel group that senses light in a first wavelength range, a second pixel group that senses light in a second wavelength range different than the first wavelength range, and a first layer comprising first nanostructures positioned over the first pixel group to redirect light. The second pixel group is disposed amongst pixels of the first pixel group.