Ambient Light Sensor UV Detection Wavelength Conversion
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Solution Overview
Problem
Conventional ambient light sensors either struggle with sensing ultraviolet light due to low response intensity and noise from visible light, or they fail to detect visible light when designed for ultraviolet light sensing, making them inadequate for simultaneous UV and visible light detection.
Innovation Solution
An ambient light sensor combining a visible light sensing chip with a wavelength conversion layer that converts specific ultraviolet light bands into visible light bands, allowing for simultaneous UV and visible light detection, and optionally using a band-pass filter to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional ambient light sensor uses silicon as the absorbing layer material for UV-A sensing, then it can detect ultraviolet light, but the sensing response is low and visible light becomes noise
Solution Approach 1:
The sensor is divided into multiple sensing regions with different absorbing layer materials. The first sensing region uses silicon for UV-A detection, while the second sensing region uses a different material optimized for visible light detection. This segmentation allows each region to specialize in detecting its target wavelength range without interference from other wavelengths.
Solution Approach 2:
Different absorbing layer materials are applied to different local regions of the sensor. The silicon-based absorbing layer is used specifically in the UV-A sensing region, while other materials are used in visible light sensing regions. This local quality approach ensures that each region has the optimal material properties for its specific detection function.
2Adaptability or versatility
If a conventional ambient light sensor uses silicon carbide as the absorbing layer material for wider ultraviolet light band sensing, then it can detect broader UV spectrum, but it becomes unable to sense visible light
Solution Approach 1:
The sensor is divided into multiple sensing regions with different absorbing layer materials. The first sensing region uses silicon carbide for broader UV spectrum detection, while the second sensing region uses a different material optimized for visible light detection. This segmentation allows each region to specialize in detecting its target wavelength range without interference from other wavelengths.
Solution Approach 2:
Different absorbing layer materials are applied to different local regions of the sensor. The silicon carbide-based absorbing layer is used specifically in the UV sensing region, while other materials are used in visible light sensing regions. This local quality approach ensures that each region has the optimal material properties for its specific detection function.
3Adaptability or versatility
If separate UV and visible light sensors are used to meet different light sensing requirements, then comprehensive light detection is achieved, but device complexity and volume increase
Solution Approach 1:
Multiple sensing functions are merged into a single integrated sensor device. The sensor includes multiple sensing regions with different absorbing layer materials, allowing simultaneous detection of UV and visible light within one compact structure. This eliminates the need for separate sensor components and reduces overall device complexity.
Solution Approach 2:
The sensor is designed with multi-functionality to perform both UV and visible light detection within a single device. By incorporating multiple absorbing layer materials in different sensing regions, the sensor achieves universal light sensing capability across different wavelength ranges without requiring multiple separate sensors.
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 enables improved response intensity for ultraviolet light detection while also providing simultaneous UV and visible light detection, reducing sensor volume and manufacturing costs compared to conventional technologies.
Implementation Method 1
The wavelength conversion layer is used to convert light corresponding to a specific ultraviolet light band of the external light into light corresponding to the response band of visible light
Data Source
AI summary
The present invention provides an ambient light sensor with ultraviolet light detection function, which is adopted to receive external light for sensing. The ambient light sensor comprises a visible light sensing chip and a wavelength conversion layer. The visible light sensing chip is used for sensing light corresponding to the response band of visible light, and the visible light sensing chip includes a light receiving surface. The wavelength conversion layer is used to convert light corresponding to a specific ultraviolet light band of the external light into light corresponding to a response band of visible light, and the wavelength conversion layer covers at least a part of the light receiving surface.