Planar Photodetector Layout With Alternating Light Sources for Clear Imaging
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Solution Overview
Problem
Existing detection devices face challenges in improving detection accuracy due to the need for larger sizes when detecting objects over a larger area, and surface light sources can blur images by emitting light in different directions.
Innovation Solution
A detection device with a planar configuration of photodetection elements, a light-transmitting placement substrate, and multiple light sources arranged in a staggered pattern, where light sources are turned on and off in alternating periods to capture and combine images, reducing interference and allowing for precise imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a point light source is used to irradiate a larger detection area, then the detection area increases, but the distance between the light source and optical sensor must be increased, making the device larger in size
Solution Approach 1:
The patent divides the single point light source into multiple point light sources arranged in a matrix pattern. This segmentation allows each light source to illuminate a specific region, and by combining the detection results from multiple regions, a larger detection area is achieved without requiring a proportionally larger device size, thus resolving the contradiction between detection area and device size.
Solution Approach 2:
The patent transitions from a single point light source to a two-dimensional matrix arrangement of multiple point light sources. This dimensional change allows the system to cover a larger detection area by distributing light sources across the plane, rather than relying on a single distant source, thereby increasing detection area without proportionally increasing device size.
2Area of stationary object
If a surface light source is used to irradiate a larger area, then the detection area increases, but light is emitted in different directions which may blur the image captured by the optical sensor
Solution Approach 1:
The patent segments the surface light source into multiple discrete point light sources. Each point light source emits light in a focused direction toward its corresponding detection region, avoiding the omnidirectional emission of surface light sources. This segmentation maintains image clarity while collectively covering a larger detection area through the combined output of multiple point sources.
Solution Approach 2:
The patent assigns different emission characteristics to different regions of the light source array. Each point light source is positioned and oriented to emit light specifically toward its corresponding detection region, creating localized optimal illumination. This local quality approach ensures that each region receives focused light for clear imaging, while the overall system covers a large detection area.
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 improved detection accuracy and image clarity by minimizing light interference and allowing for a smaller device size, while maintaining effective coverage of the detection area.
Implementation Method 1
light emitted from the point light source passes through a culture medium and a plurality of objects to be detected (microbes), and enters the photosensor
Data Source
AI summary
According to an aspect, a detection device includes: a planar detection device including photodetection elements arranged in a planar configuration; a light-transmitting placement substrate to place thereon objects to be detected; and light sources provided correspondingly to the photodetection elements. The planar detection device, the placement substrate, and the light sources are arranged in the order as listed. The light sources include first light sources that are separately arranged and second light sources that are arranged adjacent to the respective first light sources. The detection device has: a first period in which the first light sources are on and the second light sources are off; and a second period in which the second light sources are on and the first light sources are off. The detection device is configured to combine a first image detected in the first period with a second image detected in the second period.