Optical Sensor Panel Exposure Timing for Consistent Color Detection
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Solution Overview
Problem
Existing detection devices for biological tissues or microorganisms suffer from reduced detection accuracy due to variations in luminance of light sources, which affect color tones in culture environments.
Innovation Solution
A detection device with a sensor panel and light source unit that employs optical sensors arranged in a two-dimensional matrix, where light sources emit different colors in separate periods, and adjusts exposure times to ensure consistent output levels regardless of light source luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light sources of different colors are used to detect color information, then color detection capability is improved, but detection accuracy deteriorates due to luminance variations among light sources
Solution Approach 1:
The patent changes the exposure time parameter for each light source to compensate for luminance variations. By adjusting exposure times individually for each color light source, the system normalizes the output signals so that they can be directly compared, thereby maintaining high detection accuracy while using multiple color light sources.
Solution Approach 2:
The patent implements dynamic exposure time adjustment where the exposure time is not fixed but varies according to the specific light source being used. This dynamic parameter adjustment allows the system to adapt to the luminance characteristics of different light sources in real-time, resolving the contradiction between versatility and precision.
2Loss of information
If light sources with different luminances are used, then color information can be detected, but color tone accuracy deteriorates due to luminance variations
Solution Approach 1:
The patent adjusts the exposure time parameter for each light source to compensate for luminance variations. By setting different exposure times for light sources with different luminances, the system ensures that the detected color information is not biased by luminance differences, thereby maintaining high color tone accuracy.
Solution Approach 2:
The system incorporates feedback mechanisms where the output signals from each light source are monitored and adjusted. The exposure time for each light source is determined based on feedback information about the actual luminance output, ensuring that color tone accuracy is maintained despite variations in light source characteristics.
3Device complexity
If uniform exposure time is used for all light sources, then device complexity is reduced, but detection accuracy deteriorates due to inability to compensate for luminance variations
Solution Approach 1:
The patent introduces variable exposure time parameters for different light sources, which increases device complexity slightly. However, this parameter change enables the system to compensate for luminance variations and maintain high detection accuracy, representing an acceptable trade-off between complexity and precision.
Solution Approach 2:
The system performs preliminary determination of appropriate exposure times for each light source before actual detection. By pre-calculating or pre-setting the exposure times based on the luminance characteristics of each light source, the system avoids complex real-time adjustments while maintaining high detection accuracy.
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 device achieves improved color detection accuracy by ensuring consistent output ranges across varying luminance levels, enhancing color reproduction and detection precision.
Implementation Method 1
Each of the optical sensors comprises a photodiode and is configured to obtain an output corresponding to a photocurrent generated corresponding to light detected by the photodiode
Data Source
AI summary
According to an aspect, a detection device includes: a sensor panel that has a detection area in which optical sensors are arranged; a light source unit comprising multiple types of light sources; a member on which an object to be detected is to be placed; and a detection circuit configured to obtain outputs of the optical sensors. The light sources configured to emit light in different colors are configured not to be turned on simultaneously but to be turned on in different periods. An exposure time when the optical sensor detects light differs between the light sources that emit light in different colors. The output of the optical sensor under conditions where the object to be detected is not placed falls within an output range corresponding to a predetermined target value, regardless of the color of the light emitted by one of the light sources that is turned on.