Ambient Light Sensor Color Temperature Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ambient light sensors exhibit inconsistent output light intensities under different color temperatures, leading to deviations in light intensity detection across various ambient light sources.
Innovation Solution
An ambient light sensor system that includes a first photodiode sensitive to visible and infrared light and a second photodiode sensitive only to infrared light, which acquires a color temperature by integrating light spectral and sensitivity curves to adjust output light intensity using a parameter ratio, ensuring consistent output across different color temperatures through coefficient adjustments in the output light intensity calculation formula.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an ambient light sensor uses a single photodiode to detect light intensity, then the device structure is simple, but the output light intensity varies under different color temperatures leading to detection deviation
Solution Approach 1:
The patent divides the light detection function into two separate photodiodes: one sensitive to visible light and another sensitive to infrared light. This segmentation allows independent measurement of different light components, enabling the system to compensate for color temperature variations and achieve consistent output light intensity across different lighting conditions.
Solution Approach 2:
The patent changes the sensitivity parameters of the photodiodes by using two photodiodes with different spectral sensitivity characteristics. One photodiode is designed to be sensitive to visible light while the other is sensitive to infrared light, allowing the system to adjust and compensate for variations in color temperature to maintain accurate light intensity detection.
2Device complexity
If an ambient light sensor detects all wavelengths equally, then the detection process is simple, but the output does not match human eye perception of brightness
Solution Approach 1:
The patent applies local quality by giving different spectral sensitivity characteristics to different photodiodes. The first photodiode is optimized for visible light sensitivity while the second is optimized for infrared light sensitivity, matching the human eye's differential response to different wavelengths and enabling accurate brightness perception.
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 system achieves consistent output light intensities under varying color temperatures, eliminating detection deviations and enhancing user experience by simulating human eye perception of light intensity.
Implementation Method 1
a first photodiode that is sensitive to visible light and infrared light
Implementation Method 2
a second photodiode that is sensitive only to infrared light
Data Source
AI summary
A method for adjusting an ambient light sensor includes: acquiring a color temperature of light received by the ambient light sensor; and adjusting an output light intensity of the ambient light sensor according to the color temperature to enable output light intensities of the ambient light sensor to be consistent under received light with different color temperatures. The ambient light sensor includes: an acquiring device, configured to acquire a color temperature of light received by the ambient light sensor; and an adjuster, configured to adjust an output light intensity of the ambient light sensor according to the color temperature acquired by the acquiring device to enable output light intensities of the ambient light sensor to be consistent under received light with different color temperatures.